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1
Magee, Samuel John. "Investigation of the performance and emissions characteristics of small capacity two-stroke cycle engines." Thesis, Queen's University Belfast, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388072.
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Michlberger, Alexander. "Development of Test Methodology for Evaluation of Fuel Economy in Motorcycle Engines." Cleveland State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=csu1397567798.
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Moritz, Henrique. "Desenvolvimento de um motor de combustão interna para Fórmula SAE." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/18/18147/tde-28072016-073720/.
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A presente dissertação trata do projeto de um motor de combustão interna de quatro tempos, ciclo Otto, destinado à categoria de competição Formula SAE, adequado ao mercado brasileiro. Uma extensa pesquisa bibliográfica e de mercado foi realizada para o direcionamento do projeto, além de análises experimentais para obtenção de dados. No estudo experimental foi utilizado um motor monocilíndrico de 300 cc de deslocamento volumétrico, arrefecido a ar, oriundo de uma motocicleta comercial atual, denominado nesta dissertação como \"motor base\". Esse motor foi instalado em uma bancada de dinamômetro e instrumentado de forma a permitir sua avaliação mecânica e termodinâmica. Estudos de desempenho, análises de combustão e emissões também foram realizados, incluindo utilização de etanol, variações da razão ar/combustível e sobrealimentação. Igualmente, foram feitos ensaios experimentais de componentes específicos utilizados no projeto. Os dados experimentais foram utilizados como parâmetros para o projeto mecânico do novo motor Formula SAE, e para a modelagem e simulação do motor base em fluidodinâmica computacional unidimensional (CFD-1D), que foi utilizada como ferramenta auxiliar do projeto. O escopo do projeto mecânico do motor foi restrito ao bloco, virabrequim e alguns componentes de integração, uma vez que todos os demais componentes foram extraídos do motor base e de outros motores presentes no mercado nacional. O motor Formula SAE foi projetado em ambiente computacional (CAD), sendo que para o projeto mecânico do bloco e virabrequim foram realizadas simulações computacionais estruturais, utilizando o método dos elementos finitos (FEA), para verificação da distribuição de tensões nos componentes projetados. O novo motor Formula SAE apresentou vantagens significativas em relação aos custos para aquisição de peças de montagem e reposição, e proporcionou flexibilidade de montagem e operação.The present dissertation addresses the design of a 4 stroke Otto cycle internal combustion engine dedicated to Formula SAE student program and fitted to the Brazilian market. An extensive literature review and a market benchmark were performed, in order to provide guidance to the project, and experimental analysis for data acquisition. For the experimental study, a 300 cm3 single cylinder air cooled motorcycle engine has been used, taken from a motorcycle currently in production, available in Brazilian market, called in this dissertation as \"base engine\". This engine has been installed in a dynamometer test bench and instrumented in order to allow its mechanical and thermodynamic evaluation. Performance, combustion and emissions analysis were also performed, including ethanol fueling, air/fuel ratio variation and supercharging. Experimental tests with specific engine components were performed to provide necessary design data. The experimental data were used as input parameters for the mechanical design, as well as for modeling and simulation of the base engine on one-dimensional computer fluid dynamics, which was used as an auxiliary tool for this project. The scope of mechanical design of this engine was restrict to the crankcase, crankshaft and some assembly components, since all other components were taken from the base engine and other engines from the national market. The design was assisted by computer aided design (CAD). In order to verify the crankcase and crankshaft mechanical design regarding stress distribution, computational structural analysis have been performed using the finite element method (FEA). The new Formula SAE engine presented significant advantages regarding purchasing costs of parts for assembly and maintenance, and provided assembly and operation flexibility.
4
Esposito, Delia. "Torque Model Calibration of a Motorcycle Internal Combustion Engine." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15964/.
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Optimizing the performance of internal combustion engines increases complexity of control strategies and makes the calibration process long and expensive.
The first activity of this Thesis explains the possibility of reduce tests on the bench saving in terms of working hours and operating costs. In particular, through MATLAB codes, it’s shown how extrapolating data of spark advance min and extramin from the spark advance dynamic sweep.
The tests are usually demanded by the ECU supplier, who is responsible for the final calibration, but the calibrator engineer still has the task of checking the work of the supplier. For this reason the second activity of this Thesis was to create a simplified Torque-based model that determines the behavior and response of the engine (R2 = 0.98). Cases of study are explained in details and various simulations are realized.
5
Slíva, Jakub. "Motocyklový rotační motor." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378137.
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This master's thesis describes a concept of Wankel type rotary engine for use in motorcycle with estimated power between 70 – 80 kW. Basic geometry parameters of rotor and ports are calculated. Power output is then checked on equivalent piston combustion engine with central crank mechanism in 1D simulation model. Rotor is designed for use with oil cooling system. Rotor is checked for safe design by static FEM analysis by applying maximum pressure found out of 1D simulation model.
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Vašica, Radoslav. "Měření zpomalení motocyklů při brzdění motorem." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-233034.
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Diploma thesis deals with the deceleration of the motorcycles with the use of engine braking. Work can by divided into theoretical and practical part. The theoretical part begins with the possibility of division motorcycles according to several criteria. Below is given the primary papers of literature, usable in connection with the issue of this work. Subsequently, the work discusses the factors which are affecting the course of the deceleration with the use of engine braking. The practical part acquaints the reader with available measuring devices, with the place of measurement and the methodology. The following are listed specific measured values for individual motorcycles, supplemented with graphical output. At the end of the practical part is for comparison a brief summary of the measured values of each tested vehicle. Interpretation and evaluation of the measured data are contained in the conclusion of the work.
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Švábík, Roman. "Jednoválcový motor pro silniční závodní motocykl." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231777.
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The aim of this thesis is design of one cylinder engine, with stroke volume 250ccm, for a Moto3 category racing motorbike. At the begin the thesis describes rules for engine design for Moto3 racing motorbike category and gives a summary about current technologies in engine design and motorcycle development. Another part describes construction features of engine design, completed with crank shaft analysis using the LSA method.
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Morozov, Anton. "Jednoválcový motor pro silniční závodní motocykl." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231413.
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This thesis describes the design of four-stroke single-cylinder liquid-cooled engine with a displacement of 250 cm3 designed for Moto3 road racing motorcycle. The first chapter describes designs of existing modern engines and requirements to these engines. The next section describes the design of crank mechanism and its components. The following part describes balance shaft, timing mechanism, cylinder, cylinder head, crankcase, cooling system, lubrication system.
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Šebesta, Radek. "Návrh moderního spalovacího motoru konstrukce V8." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229724.
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Master´s thesis is considered with design and construction of V8 combustion engine with small size and low mass of its body. In the construction were used mass-produced components from the other engines. From every component was generated a 3D model in computer program Pro/Engineer, new necessary parts were made in the same program and put together to assembly. Main part of the construction was to design a new crankshaft, a crankcase and an engine lubricating system. The crankshaft was subjected computing analysis in program Pro/Mechanica, using FEM.
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Břečka, Lukáš. "Čtyřdobý motor pro malý motocykl." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227892.
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This diploma work dissertate of 4-stroke engine for small motorcyle design concept with set points. There is description design concept of single part, analysis of crank mechanism, draft calculations of cran and cam mechanism with solidity calculation of motor piston. Part of this diploma wokr is strain analysis of motor piston with finite element method (FEM).
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黃治立. "Development of a stratified-scavenging technique for two-stroke motorcycle engines." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/03725071815616128506.
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碩士國立臺灣科技大學
機械工程技術研究所
86
To avoid the high HC emission due to the short-circuiting effet of a two-stroke cycle engine, a modified stratified-scavenging two-stoke cycle engine were designed and studied. The performance of the stratified-scavenging engine was just a little lower than the original one. However, the brake specific fuel consumption and exhaust emission were drastically improved. It was possible to lower the brake specific fuel consumption by 10-20%, carbon monoxide by 40-90%, and hydrocarbon by 20-30%. The exhaust emissions are much lower than the requirement of regulation.
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Guan-RuLin and 林冠儒. "Dynamic Analysis and Experiment of a Timing-Chain System for Motorcycle Engines." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/e7sscr.
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碩士國立成功大學
機械工程學系
102
Engine timing systems are used to control engine valves. In timing systems, silent chains are applied to transmit power from crankshafts to camshafts. In practice, ensuring appropriate tension is essential, since small tension may cause unsmooth motion and vibration. Therefore, guides and tensioners are used to maintain proper tension. However, the slack-span guide is prone to damage after long-term operations. In this study, a timing system for a 300 cc motorcycle engine is modeled by commercial software based on multi-body dynamics. Dynamic analysis is conducted to investigate the dynamic behavior of the timing system, such as chain tension, contact forces and tensioner force. To determine model parameters, experiments, theories and sensitivity analysis are utilized to ensure that the parameters are proper. To illustrate why the slack-span guide fails, stress analysis of the guide is performed by software based on finite element method after dynamic analysis. In addition, the simplified mathematical model of silent chain drives is established to understand how the commercial software analyze the dynamic behavior of silent chain drives. Therefore, the mathematical model is based on the same assumptions and theories as the software, such as bushing force elements and continuous contact force model. Finally, dynamic experiments are conducted to verify the simulation results.
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Sun, Ruei-Hong, and 孫睿鴻. "Performance and Pollutant Emission of Four-stroke Motorcycle Engines Using Ethanol-Gasoline Blended Fuels." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/86313897589021654391.
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碩士國立臺灣大學
生物產業機電工程學研究所
98
The effects of air pollutant emissions and engine performance of a single four-stroke 125 cm3 displacement motorcycle engine with it’s original carburetor using various ethanol-gasoline blended fuels were investigated in this study. The experiments were conducted at four speeds (30, 40, 50, and 60 km/hr) with five kinds of ethanol blending percentage (0, 10, 20, 30, and 40% v/v) fuel conditions. Power output, fuel consumption, gaseous air pollutants, and aerosol air pollutants were measured to analyze their results. The results showed the power output was slightly decreased and the fuel consumption was a little increased when ethanol-gasoline blended fuel was used. The results showed an average reduction of 0.83 - 30.82 % in engine power output and an average increase of 7.02 - 30.79 % in engine brake specific fuel consumption. Regarding the influences of air pollutants compared with using no-ethanol gasoline fuel, the emission of CO had an average reduction of 73 - 98.47 % and the emission of NOx had an average increase of 9.46 - 63.55 %. Furthermore, the particulate matters number concentrations was reduced when the ethanol blended rate was increased, the average total number concentration reduced at 7.62 - 90.6 % and the average mass concentration reduced at 21.76 - 99 %.
14
Tai, Chang-Cheng, and 戴昌正. "The Development and Experimental Analysis of a Transient Test Cell for Fuel-Injection Motorcycle Engines." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/72483585939434120279.
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碩士中正理工學院
兵器系統工程研究所
87
In order to investigate the optimum transient control strategies, four-stroke gasoline engines with electronic controlled injection and ignition modules remodeled from carburetor-type motorcycle engines are used in this study. A general purpose developing software, LabWindows, was used to develop graphic user interface for testing engine transient characteristics. Besides the analysis of lean burn capability for three different production engines, engine acceleration rate according to the control parameters of fuelling and ignition timing was also investigated. The transient fuelling and ignition control methods proposed in this study showed a better way to perform accelerating tests. The experiment results reveal that the maximum acceleration rate may be reached with appropriate extra fuelling, throttle position and ignition timing. Besides experimentally obtained the peak and period of extra fuelling for maximum accelerating rate, the optimum timing of extra fuelling is 0.25 second earlier than that of throttle opening. The commercial engine control unit used in this study has provided many functions, it limits the implementation of control algorithms. A PC base engine control unit was therefore to be developed. The graphic user interface is also implemented while those control parameters could be adjusted conveniently. It provides a method to explore the control algorithms of engine acceleration by accessing not only the setting parameters but also the control algorithms.
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Chieh, Yu Chun, and 于駿傑. "Application of Thermal Management System for Reducing Cold-Start Emissions of Air Cooled Motorcycle Engines." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/58658v.
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碩士南臺科技大學
機械工程系
106
Cold-start emissions are higher than other engine working conditions due to low engine temperature and unsufficient catalytic ignition temperature. NOX, HC and CO Emissions are the main pollution. They are highly regulated by the most advanced countries because they might effect people healthy and may be cancer causes. One conventional air-cooled engine with and without the thermal management system are compared in this experiment. The experiment was done in national standared emissions testing lab. The thermal management system is able to reduce heat loss at cold-start mode. Thus it is able to reduce emissions. The experiment results show that the air-cooled engine with thermal management system can reduce its emissions, NOX, HC and CO, by 5%-37% in both EU3 and WMTC driving cycles.
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Wu, Jia-Yan, and 吳嘉晏. "3-D Thermal-Hydraulic Characteristic Analysis for Motorcycle Engines with Air-Cooling and Water-Cooling." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/89982589908391855229.
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碩士國立成功大學
機械工程學系碩博士班
97
This study utilizes heat transfer and computational fluid dynamics theory to numerically analyze the 3-D thermal-hydraulic characteristic for motorcycle engines with air-cooling and water-cooling, respectively. For air-cooling motorcycle engine, the finite element method has been used to solve the temperature field and heat transfer rate for each component (intake valves, exhaust valves, piston, piston rings, cylinder head and cylinder) of motorcycle engine when the piston is in the Top Dead Center (TDC) and Bottom Dead Center (BDC), respectively. For water-cooling motorcycle engine, the flow field and the velocity distribution for air flow over the space between the grille, tire, the mud cover and radiator of the motorcycle were analyzed for different motorcycle speed and grill angles. In addition, the heat transfer performances of the radiator were examined in conduction with the radiator computer-aided design radiator software. The results showed that the fraction of heat transfer rate for each component are as follows: intake valves 11％, exhaust valves 8％, cylinder head 21％, the piston 35％ and the cylinder 25％. The average velocity inside the radiator is only about 20% to 22% of inlet velocity when the inlet velocity is varied from 2 m/s to 20 m/s. When the grille angle is decreased α=-10°,the radiator average velocity and the heat transfer rate are increased 10.2% and 8.4 %, respectively, while the grille angle is increased α=+10°,the radiator average velocity and the heat transfer rate are decreased 3.7% and 3.1%, respectively. The numerical prediction is in good agreement with experimental data within 17%.
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Hung, Yan-Ching, and 洪晏清. "The Study of Decreasing Exhaust White Smoke Via the Microcomputer Control Oil Supply for 2-Stroke Motorcycle Engines." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/63379226046588900340.
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碩士國立中興大學
機械工程學系
92
The white smoke exhausted by two-stroke motorcycles, mainly is caused of no combustion or the incomplete oil compound combustion. Exhaust are related by the compound of engine oil and oil consumed. But speaking of two-stroke motorcycles user, when he/she purchases engine oil, generally can choose the price inexpensive engine oil, rather than choose a price expensive and low smoke engine oil, thus this thesis conducts the discussion research supplies of quantity in view of the engine oil. The study uses the microcomputer control mode supplies adequate amount of engine oil to make up the shortcoming of the mechanical type oil pump. The consequence is the reduce oil consumption. Therefore the exhaust of white smoke is decreased. The study uses 50㏄ air-cooling engine and conducts the experimental study on the power gauge. The study indicted that increase（or decrease） engine oil supply suddenly would not result in the increase（or decrease） of smoke simultaneously. It implied that the residue oil along with waste gas would be stored in the exhaust muffle. In contrast of mechanical type supply system, when power setting was selected in full load (smoke 1%) and rotational speed were 2000rpm, 3000rpm, 4000rpm, 5000rpm, 6000rpm, that made quantity of oil supplies as low as 29.2﹪, 34.8 ﹪, 47.1 ﹪, 62.7 ﹪and 81.8 ﹪respectly. It was determined that mechanical type of oil supply system of two-stroke motorcycles overfeed the system. When lower the rotational speed, it made the situation became severely. To reduce exhaust amount of the white smoke and supplying the adequate oil quantity control via the control stick angle of the microcomputer control. Therefore the oil consumption is reduced for mechanical type oil supply system. In the findings also discovered when the microcomputer control mode adjusted oil supply quantity, the discharges HC/CO has also decreased. And it would be more apparent when full power setting is selected.
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CHEN, JIN-MAO, and 陳進茂. "Recognition of 2-dimensional motorcycle engine parts." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/02101528202193944411.
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Chen, Cheng-An, and 陳政安. "Effects of Emulsified Fuels on Motorcycle Engine." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/4x8vmz.
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碩士國立臺北科技大學
車輛工程系所
94
The 5th stage motorcycle emission regulation of Taiwan will start from July 1, 2007. The CO and HC are not difficult to meet, but the standard of NOx is a great challenge. This paper used gasoline/water emulsions with 5, 10, and 15% water for a four strokes, 125cc motorcycle engine to reduce NOx emission. The experimental results indicated that emulsified fuel with appropriate rate of water can increase engine torque and reduce fuel consumption. The exhaust emissions of NOx and CO were significantly reduced. When use gasoline/water emulsions with 10% water, Engine torque increase 5.02%, CO decrease 35.2%, NOx decrease 30.6%, but the HC emissions was increased. The emulsified fuel with 15% water is the worst case due to too much water in the fuel. The exhaust temperature is increased and the engine torque is decreased due to slow combustion rate.
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Chen, Chung-ying, and 陳仲頴. "Low-Emission Engine and Fuel Technology for Motorcycle." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/79063456023428816015.
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博士國立中山大學
機械與機電工程學系研究所
101
The purpose of this research is to apply an adaptive fuel injection control algorithm on a motorcycle engine and evaluate its performance. A highly nonlinear switching type EGO sensor is used to measure the air fuel ratio of the engine. In the research, the nonlinear control algorithm is developed based on a Lyapunov function. Furthermore, an observer is also applied to estimate the air flow rate into the combustion room, The results show that the air fuel ratio and engine speed are stable under steady manoeuvres and the air-fuel ration values are satisfactory. This articls studied water-gasoline emulsion for reducing the NOX emissions of a motorcycle engine. Emulsified gasoline fuels of 0, 5, 10 and 15% water by volume were used in a four-stroke,125 cc, port injection, spark-ignition engine. Both full throttle speed ranging from 2,000 to 7,000 rpm and low load were tested. The engine torque, fuel consumption, exhaust emissions and combustion characteristics were investigated. The experimental results show that the engine torque and fuel consumption are improved for 5 and 10% water emulsions. However, at 15%, the engine torque and fuel consumption deteriorate and the exhaust temperature is increased owing to slow burn rate. The exhaust emissions of NOX and CO decrease as the water percentage in the emulsion increases. A higher oxygen concentration in exhaust gas of emulsified fuel was found, which results in lower CO emission. The HC emission is increased with increasing water content, which might be caused by the thicker quench layer of emulsified fuel combustion. An appropriate concentration of water in the emulsified gasoline fuel for a 125 cc motorcycle engine is found to 10%.
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Wang, Yung-Sheng, and 王永昇. "Application of Utility Engine on Hybrid Electric Motorcycle." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/yvw96u.
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碩士國立臺北科技大學
車輛工程系所
97
The purpose of this research is to develop a hybrid electric motorcycle (HEM) with utility engine. That is based on electronic vehicle technology with battery, and focus on the performance of the utility engine and low cost of manufacture. The utility engine has the advantages of low cost, light weight, and high power density, which reduce the exhaust pollutions and energy consumption of the vehicle. This research combines a utility engine and a motor in a target motorcycle to establish a hybrid electric motorcycle. The utility engine has high power at high speed and the electric motor has good performance at low speed. In order to achieve low cost and light weight, an existing 49cc utility engine and a 500W/36V wheel motor are used. The concept of this HEM is to drive the vehicle with motor at low speed and run the engine at high speed. This hybrid electric motorcycle is tested with practical running, and then the test results are analyzed. The results show that the application of utility engine on hybrid electric motorcycle is feasible. However, the transmission system is limited in one gear ratio, so the power output is not smooth and the fuel economy is not good.
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Wang, Pin-Han, and 王品翰. "Optimizing Combustion Chamber Design of a Motorcycle Engine." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/29638236126819012986.
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碩士國立臺灣科技大學
機械工程系
105
The in-cylinder flows in the axial planes of a motored two-vavle, single-cylinder, four-stroke engine during the intake and compression strokes at an engine speed of 6000 RPM and throttle opening of 100% were diagnosed by using computational methods. Moderate and intense tumble motions were generated by changing the combustion chamber geometric design. The computations were carried out by the computational fluid dynamics (CFD) software CONVERGE. The ensemble averaged conservation equations for mass, momentum, and energy in transient state conditions with the k-ε thubulence model were solved. The orthogonal, structured grid which reproduced the geometry of the inlet port, exhaust port, combustion chamber, and real fluid system was automatically generated by CONVERGE. Quantified strengths of the rotationg motions in the axial planes were represented by a dimensionless variable tumble ratio, which was defined as the ratio of mean angular velocity of the vortices in the target plane at a certain crank angle to the average angular velocity of the crank. The quantitative results of cycle-averaged tumble ratio indicated the correlation between strengths of tumble motion and combustion chamber geometric design. The results showed that the engine with an optimized combustion chamber presented an significant increase in cycle-averaged tumble ratio by about 16% when compared with that of the original engine.
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Yameogo, Amadou, and 亞彌. "Detecting the misfire of motorcycle engine with oxygen sensors." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/04109344577819740029.
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碩士國立中興大學
機械工程學系所
101
The use of the three-way catalyst in motor vehicles has entailed a radical increase in the importance of misfire detection. In the case of a misfire, unburned fuel accesses the exhaust system, where its combustion in catalyst causes a dangerous increase of temperature, which may result in damage to the catalyst due to its thermal overload. Moreover, it may also lead to an increased emission of toxic substances. Therefore, misfire in an internal combustion engine must be detected, as specified in the On-Board Diagnostics II (OBDII) regulations beginning from 1996 model year, according to the Environmental Protection Agency (E.P.A.). Misfire detection constitutes an essential ingredient of OBDII. Its implementation entails the use of sophisticated measurement methods and the processing of the measured signals. Misfires tend to be related to a faulty ignition system, (Defective ignition plugs, leaking secondary insulation, damaged ignition control module or high voltage wires). Yet there is still a wide spectrum of other possible causes of misfire, not connected with the spark generation circuit. Misfire may rise, for example; due to the leaky intake manifold, mechanisms damage to the engine, EGR system valve damage, inappropriate air-fuel ratio, Exhaust restrictions, damaged crankcase ventilation system (PVC), damaged injector, damaged intake or outlet valves or their improper control timing. If misfire occurs with such high frequency that the excessive quantity of unburned fuel accessing the catalyst threatens to damage it, the blinking malfunction indicator lamp (MIL) will make the driver aware of the extent of the damage of the engine. Many strategies of misfire detection have been developed, including variation in engine shaft angular speed, spark plug voltage, cylinder pressure, oxygen sensor signal, knowledge based expert system, and neural networks. WE propose a new method to use the real time signals of conventional oxygen sensor (EGO) and wide band oxygen sensor (UEGO) to detect misfire. In this paper, misfire was induced on purpose with a misfire generator. The sensors and the misfire trigger signals were recorded simultaneously. In this paper, we suggested a misfire detection method which used the fluctuation of an EGO and an UEGO sensors output signals caused by a misfire. The fluctuation in oxygen concentration in an exhaust manifold was estimated by recording the conventional oxygen sensor signal and the wide band oxygen sensor signal. It was found that the differentiated sensors’ signals give the criteria for misfire detection. The misfire can be detected by monitoring the amplitude of the fluctuation in the differentiated signals. The differentiated signals of UEGO and EGO sensors can be used for misfire detection in a single cylinder motorcycle engine at any operating conditions. The proposed misfire detection method had showed a reliability up to 98% for UEGO and 90% for EGO sensors at different engine operating conditions such as: engine speed from idle (2000rpm) to 5000rpm, engine loads 20%TPS to 60% TPS, and Air-fuel ratio varying from lean to rich.
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Chou, Tsu-chuan, and 周祖詮. "Tolerance Analysis of the Power System for Motorcycle Engine." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/8u9w68.
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碩士國立臺灣科技大學
機械工程系
99
This thesis examines the variations of critical dimensions and compression ratio of a motorcycle engine. The dimension chains for compression ratio, the clearances as the piston on the top dead center and bottom dead center are derived. Because the compression ratio involves in a nonlinear function of independent dimensions, a linearized dimension chain is used to estimate the tolerance of the derived variable. Excel tables are employed to record the data for tolerance analysis based on the worst case method and statistical method. his work investigates the influences of the tolerance of independent dimensions on the variation of the derived dimensions. The results of this study suggests that the nominal value of some particular dimensions may be modified. In addition, slightly increasing the tolerance of the components of power system can reduce the manufacturing cost but the assembly still meets the functional requirement.
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Hong, Kai-Xian, and 洪凱賢. "Investigation of HCCI Engine for Series Hybrid Electric Motorcycle." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/c8v22h.
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碩士國立臺北科技大學
車輛工程系所
99
Homogeneous Charge Compression Ignition (HCCI) engine combines the advantages of high thermal efficiency of diesel engine and low emission of gasoline engine. In this study, HCCI series hybrid system includes the technologies of HCCI engine and series hybrid system. Therefore, HCCI series hybrid system can achieve the goals of lower fuel consumption and reduce emission of engine. The HCCI engine is modified by the original engine, and combines it with series hybrid system. The DC brush motor is used to front wheel which as power source. It is driven by the battery of lead-acid (48 V). The fuel system of HCCI engine is includes 92 unleaded gasoline and dimethylether (DME). At first, the 92 unleaded gasoline is used for SI mode which to reach operating temperature, and then the DME is for HCCI mode. When the battery needs charging, the generator is driven by HCCI engine which to produce the output voltage (52 V) with DC-DC converter to charge the battery. The backward-facing model is used to examine integration of target comments and the fuel economy. The simulation result from the ECE-40 driving cycle of original system and HCCI series hybrid system, the HCCI series hybrid system fuel economy can be improved 2 times than original system. In the real vehicle test in ECE-40 driving cycle the original fuel economy is 30.8 km/l, the HCCI series hybrid system at the engine operating 3500 rpm, the fuel economy is 73.7 km/l, compared to the original system the fuel economy improved 139.2 %.
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JUI, LIN, and 林睿. "Computational and Experimental Analyses of a GDI Motorcycle Engine." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/6v77q3.
Full textAbstract:
碩士國立臺灣科技大學
機械工程系
102
Computational and experimental approaches were used to study the feasibility of applying the gasoline direction injection (GDI) technique to a motorcycle engine. The target device was a four-valve, four-stroke, port-injection engine with a displacement volume of 250cc. Several important differences existed between a GDI engine and a port-injection engine, for examples, (1) compression ratio, (2) vortex strengths of intake port and exhaust port, (3) injector location and angle, (4) injection pressure, injection timing, injection period, and injected fuel mass flow rate, (5) spark plug ignition timing and location of spark plug, (6) configurations of piston head, etc. The parameters of injection pressure, injection timing, injection period, and injected fuel mass flow rate as well as the configurations of piston head were considered in this study. The STAR-CD CFD code was used to calculate the fuel distribution and droplet size to obtain the optimized injection timing for the homogenous charge operation. The optimized injection time was 80o of crank angle. Totally sixteen piston head configurations were designed and optimized to obtain the best fuel concentration around the spark ignition location or the stratified charge operation. The engine test showed that the optimized ignition timing was 81o of crank angle for the homogeneous charge operation using a flat piston head. At idle, the optimized injection time was 66o of crank angle so that low exhaust concentrations (HC = 326 ppm, CO = 1.07%) were detected. These values were significantly lower than the thresholds of the latest regulations. The results of constant-torque engine tests at the engine speed of 3000 RPM showed that the break specific fuel consumption (bsfc) of the GDI engine was significantly smaller that of the port-injection engine by about 37%. The exhaust concentrations of HC and CO of these two engines were similar. Should the compression ratio, injector location &; angle, vortex strength of in-cylinder flow, spark plug ignition timing and location of spark plug are further modified, drastic improvements on the power output, fuel consumption, and exhaust may be expected.
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Liao, Ching-Fu, and 廖慶復. "Application of lean burn engine on hybrid electric motorcycle." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/d44p5a.
Full text
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Lin, Wei-cheng, and 林韋丞. "Experimental and Computational Analyses of a GDI Motorcycle Engine." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/75853845513796372821.
Full textAbstract:
碩士國立臺灣科技大學
機械工程系
101
The distributions of droplet diameters and fuel concentration of a four-stroke motorcycle engine was studied by computational and experimental methods. The computation study employed the commercial CFD code (STAR-CD) to calculate the distributions of droplet diameters and fuel concentration. By using the results of homogeneous charge, the fuel concentration presented the most relatively uniform distributions as the tip of the fuel injector was arranged at the location 32 mm left of the origin and 4.25 mm above the origin. The origin of the coordinates were placed at the center point of the piston as the piston was pushed up to the top dead center (TDC). The injection angle was optimized to be 49o from the vertical axis. The computational results based on the stratified charge fuel injection strategy showed that piston concave crown model No. 8 provided concentrated droplet near the center of the cylinder head. The injection delay time and injected fuel mass flow rate measured by the experiments of out-of-cylinder fuel injection were engaged to the computational work for simulation of fuel injection conditions. Under the homogeneous charge operation, the pollutant emissions and fuel concentration at various ends of injection angle were measured by a gas analyzer and computational method, respectively. The results showed that the fuel concentration presented the most relatively uniform distributions and the pollutant emissions were lowest at CA = 47°.
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Liu, Su-Fiu, and 劉書甫. "Air-Fuel Ratio Control of Four-Stroke Motorcycle Engine." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/66065160831349653833.
Full textAbstract:
碩士國立中興大學
機械工程學系所
95
In Taiwan, most commercial EFI system of motorcycle’s engines use the general ECU systems that provide by outsourcing, manufacturers cannot change the air-fuel control algorithm in case of their own engines. However, as Taiwan government promulgated the new emission standard, currently air-fuel ratio control performance of general ECU system is difficult to meet the issue. This research built an electronic fuel injection system by commercial motorcycle sensors, fuel injector, and throttle body. An NTK UEGO sensor was used to measure air-fuel ratio. In order to implement the control algorithm for stoichiometric air-fuel ratio control, an ECU module has developed. The ECU module is build by some commercial IC chips, and the control algorithm is implemented by ANSI C. In this research, control algorithm consisted of feed-forward control and feedback control. Both speed-density method and traditional 3D-MAP are applied in feed-forward control. In feedback control algorithm, this research uses traditional PI control because of the restriction on micro-controller computing performance. The control algorithm is valid on engine dynamometer. In order to compare the performance with different control algorithms and engine operation conditions, ITAE is applied as performance index. Besides, IAE is applied to compare the different gain of feedback control during transient engine operation.
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Tsai, Kuo-ping, and 蔡國彬. "An Associative-Classification Based Motorcycle Injection Engine Diagnosis Support System." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/66011978185175518976.
Full textAbstract:
碩士國立高雄大學
資訊工程學系碩士班
99
In the recent years, due to the discontinuation of the old type scooter of the fourth Environmental regulations, scooter manufacturers have to launch a new type of scooter using the injection fuel supply system similar to the automobile. Comparing with the traditional engines, the diagnosis of injection engines are too difficult to only count on the experiences of mechanics. A diagnosis support system is necessary. The current procedure for repairing a scooter uses a diagnostic device to read the defect code diagnosed by ECU. However, due to the complication of the ECU data, engineers have to spend a lot of time adjusting the ECU's parameters based on their test experience. There is no complete set of systems to help the engineer make a prompt and correct diagnosis. In this thesis, we take some motorcycle manufacture in Taiwan as a case study, aiming to develop a motorcycle injection engine diagnosis support system. Our system is based on a data warehouse collecting data derived from the ECU information and the defect analyses by the manufacturer, and provides OLAP and our developed data mining tool. Our mining tool adopts our proposed R-CMAR algorithm, an associative-classification technique, which can effectively reduce the amount of stored data. In addition, we use the concept of prestore to store the candidate rules in DB in order to combine the index and inquiry processing function of the data management system to speed up the response time of the system. According to the experiments, our proposed algorithm is superior to other algorithms, through which our system can provide an on-line and interactive diagnosis environment.
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Peng, Hsin-Chieh, and 彭新傑. "Multi-Objective Optimization Analysis of Engine Control Parameters of Motorcycle." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/44851457875410509970.
Full textAbstract:
碩士國防大學理工學院
車輛及運輸工程碩士班
101
Modern vehicles not only have to conform to stringent exhaust emission regulations but also simultaneously give consideration to fuel consumption, output power, and moreover, they have to accommodate different driving conditions. The aim of this thesis is to explore the multi-objective optimization parameters, for the ignition timing, injection timing, and injection duration of a motorcycle, through analyses, employing programmable engine management system and graphical programming control interface. The engine performance explored in experiments includs the output torque, brake specific fuel consumption, and exhaust pollution such as hydrocarbon and nitric oxide. By using Central Composite Design method, the orthogonal table of designed experiments was planed. Besides, through setting various required characteristics of desirability functions, of which the desirability coefficients are weighted to different extents, the present study can have both of its expected results and simultaneously taking into account the optimal control values of the indicated engine performance. Moreover, the influence catalytic converter on the overall control parameters was of also investigated, following the above procedures. Through this study, the analysis results show that the Response Surface modal of the experimental data for curve fitting can of used to approximate, trend toward, and predict the various engine performance. Both of ignition timing and injection duration have significant influences on the various engine performance, and the control parameter which has the greatest influence on the air-fuel ratio is injection duration. The present experiment of results also show that the optimal overall control parameters can effectively satisfy the demand of reflecting the characteristics of the engine performance. Meanwhile the engine equipped with a catalytic converter can control the extent of exhaust pollution, and lead the engine control parameters reaching to its best settings, and satisfy the demand of low pollution, and simultaneously meet the multiple engine performance requirements. Keyword: multi-objective optimization, engine management system, desirability function
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Liou, Jia-Yan, and 劉嘉晏. "Study of Injected Motorcycle Carbon Deposition and Engine Performance Improvement." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/4tuzma.
Full textAbstract:
碩士崑山科技大學
機械工程研究所
97
The carbon deposition and engine performance improvement of a four strokes injection motorcycle engine were studied in this paper. The effect of throttle valve and intake valve carbon deposition formation on exhaust emission was investigated. The fuel additive, improvement of filter and throttle valve bored were used to suppress the throttle valve and the intake valve carbon deposition. The effect of the position of Electronics Control Unit (ECU) on the chip operation temperature was also studied. After clean throttle valve carbon deposition, CO emissions were decreased at low speed, HC emissions were not influenced. After clean intake valve carbon deposition, HC emissions were decreased at high speed. The intake valve carbon deposition was clean up with double dosage of fuel additive. The carbon deposition weight would be reduced up to 40.6%. From the analysis of throttle valve carbon deposition , the element includes 34.8% Ca, 9.36% P, 9.29% S and 1.11% Zn, it was common in engine oil. Improvement of the filter would reduce the carbon deposition formation. The operation temperature of ECU located inside motorcycle front fairing was lower than located on the side of the throttle valve.
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Po-KangChen and 陳柏岡. "Heat Transfer Analysis of Water and Air Cooling Motorcycle Engine." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/n5k96b.
Full textAbstract:
碩士國立成功大學
機械工程學系
105
The cooling system of the motorcycle is divided into water-cooling and air-cooling. The performances of the cooling system are related to the flow rate, flow velocity and geometry of the cooling system and the geometry influence the flow field the most. In the water-cooling study, a 3-D numerical model of a 400 c.c. single cylinder water-cooled scooter engine is established and evaluated through computational fluid dynamics (CFD) with conjugated heat transfer scheme to show the temperature distribution of the engine. In order to observe the real coolant flowing through inside the water jacket, we establish a transparent water jacket model through 3-D printer. For the sake of developing the guideline of the water jacket, we arrange 12 kinds of arrangements of the gasket holes to acquire different flow fields and thermal results. It is observed that the flow rate of each case is increased from 3% to 20% with the increasing number of the gasket holes. However, the average heat transfer coefficient decreases from 3% to 15%. In the air-cooling study, a 3-D numerical model of a 163 c.c. single cylinder air-cooling engine is established. Engine working rotations are set at 3000 rpm, 5000 rpm, and 7000 rpm to simulate the flow field and heat transfer coefficient of the cooling-system to find out the location of bad cooling performances. The result shows that the bad design of the wind case led to ununiformed thermal distribution of the fin No.1 at cylinder and high temperature at the plug.
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Hsu, Hsiang-Hsi, and 許翔璽. "Characterization of Particles Exhausted from a 4-stroke Motorcycle Engine." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/93j6kc.
Full textAbstract:
碩士國立臺北科技大學
環境規劃與管理研究所
94
In Taiwan, motor vehicles are a major source of air pollution. There are about twenty-million motor vehicles in Taiwan. Particles emitted from motorcycles and formed by gas reaction or condenation deteriorate ambient air quality. Not many researches had been conducted to study motorcycle emissions. Researches on exhaust gas from motorcycle were most focused on effect of engine speed. In this thesis, the particle measurement system consistedof a 4-stroke Motorcycle Engine (125 c.c.), Dynamometer, Electrical Low-Pressure Impactor (ELPI)、Micro-Orifice Uniform Deposit Impactor (MOUDI) and Nano Micro-Orifice Uniform Deposit Impactor (Nano-MOUDI). Different fuels, 92 unleaded gasoline and 95 unleaded gasoline, were used to study their effects on the particulate emission. An Ion Chromatography (IC) and an Element Analyzer (EA) were used to analyze characterization of particles. The results suggested that particle number concentration decreased as engine rotational speeds increased. However, it increased as torque and atmospheric temperature increased. Using 92 unleaded gasoline as the tested fuel, the results suggested that number concentration was 5.6×1010 #/cm3 when rotational speed at idle and number concentration was 1.1×1010 #/cm3 when rotational speed at high speed (5775 rpm). Moreover, number concentration was 3.5×109 #/cm3 when torque was 2.0 Nm (at 3885 rpm), number concentration was 3.2×1010 #/cm3 when torque was 4.0 Nm (at 3885 rpm). Using 95 unleaded gasoline as the tested fuel, the results suggested that number concentration was 2.1×109 #/cm3 when rotational speed at idle and number concentration was 2.4×108 #/cm3 when rotational speed at high speed (5775 rpm). Moreover, number concentration was 4.1×108 #/cm3 when torque was 2.0 Nm (at 3885 rpm), number concentration was 9.3×109 #/cm3 when torque was 4.0 Nm (at 3885 rpm). By using 92 unleaded gasoline and 95 unleaded gasoline as the tesed fuel, carbon content and organic carbon content decreased as rotational speeds increased, while element carbon content increased as rotational speeds increased. Organic carbon content increased as torque increased, while element carbon content decreased as torque increased. Using 92 unleaded gasoline and 95 unleaded gasoline as tested fuels, the particle number concentration increased as atmospheric temperature increased. Particle diameter decreased as atmospheric temperature increased.
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Chen, Rong-Zheng, and 陳榮哲. "Investigating of Ethanol-Blended-Fuels Application on EFI Motorcycle Engine." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/9ev4jn.
Full textAbstract:
碩士國立臺北科技大學
車輛工程系所
95
This paper used ethanol blended gasoline with1, 2, 5, 10, 20 and 30% ethanol for a four strokes, 125cc EFI motorcycle engine to test and verify the engine performance, fuel consumption , exhaust emissions and combustion analysis. The experimental results indicated that ethanol blended gasoline with appropriate rate of ethanol can increase engine torque maximum 18% when partial load conditions and reduce fuel consumption when full load conditions.The exhaust emissions of CO and HC were reduced maximum 88% and 33% , respectively but 88% increasement of NOx emissions because of A/F ratio effect. Analysis of cylinder pressure data showed that E30 had slightly faster main burn rate and ignition delay than the E0 fuel. Not much differences were noticed when E10 was used in the engine. In conclusion, ethanol blended gasoline has the benefit for improvement volumetric efficiency and increase the engine torque due to the property of high latent heat. The exhaust emission characteristic is based on the A/F ratio effect by the content of ethanol in fuels.
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Wei-TseLin and 林煒喆. "Three Dimensional Thermal Hydraulic Analysis for Water-Cooled Motorcycle Engine." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/42669484474290664137.
Full textAbstract:
碩士國立成功大學
機械工程學系
103
By using the computational fluid dynamics (CFD) commercial software ANSYS Fluent, different numerical models are established for a 400c.c four strokes single cylinder water-cooled motorcycle engine. They are jacket flow field model, engine pure conduction model and engine conjugated heat transfer model respectively. With these models, the flow field, thermal hydraulic characteristics and temperature distribution with jacket inlet velocity (or engine speed) can be observed and analyzed. These results could reduce the time and cost to develop a new engine. The numerical results show that when the jacket inlet velocity is increased from 0.58m/s to 2.40m/s, the pressure drop is raised from 716Pa to 11663Pa and seems a parabolic curve with inlet velocity; the average heat transfer coefficient is enhanced from 2275W/m2/K to 6929 W/m2/K and being linear with inlet velocity. Comparing with experiments, the average errors are under 10%.
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Chang, Ming-Hsin, and 張明新. "Study on plasma reforming of hydrocarbon fuel and motorcycle engine application." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/25063135570692742468.
Full textAbstract:
碩士國立交通大學
工學院碩士在職專班精密與自動化工程組
97
The main focus of this study is to design, researching applications, and methods of plasma reforming of hydrocarbon fuel on four stroke motorcycle engines. The overall apparatus includes plasma recombination device, fuel and air supply system, and data analyzer instruments. The plasma recombination device consists of signal generator, reaction chamber, and gas collection chamber. The fuel and air supply system include gas contain in steel chamber, gas flow meter, and nozzle. The data analyzer instruments contain gas chromatographer, oscilloscope, and current meter, etc. The experimentation settings are O2/C ratio (0.2~0.6), the electro arc frequency (200 Hz) , the fuel flowing rate (10~50mL/min) , and the electro arc spacing (5mm~10mm). The experimental data illustrates that using appropriate setting of reaction chamber diameter, elector arc spacing, and methane flow rate, able to generate better result of hydrogen concentration and flow rate. The produced hydrogen concentration in the reaction chamber increase as the flow rate decrease. Under the appropriate system setting, the hydrogen concentration is able to reach 38.42 Vol% and hydrogen flow rate of 143.58 mL/min Another part of the study is discussion of effects on mixing high concentrate hydrogen into four stroke motorcycle engine, utilized the steel reaction chamber for high concentrate hydrogen combination to control hydrogen gas ratio (2~12%), and flow rate of high concentration hydrogen, etc. Experiment maintains the original fuel system of motorcycle engine. Modifies the air intake system for hydrogen combustion, with engine speed of 3000~6000rpm, and the engine throttle is opening 1/6-6/6degree.
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Wu, Chi-jung, and 吳啟榮. "Control of Heat Dissipation in a Motorcycle Engine via Flow Modulation." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/66678230854385301713.
Full textAbstract:
碩士國立臺灣科技大學
機械工程系
93
To improve the heat dissipation performance of a single-cylinder, four-stroke-cycle, air-cooled engine, the cooling fan, the scroll housing, the inlet, and the flow-directing cover are experimentally and numerically studied and optimized. The commercial code, STAR-CD is employed to analyze the velocity distributions between the fan blades, in the scroll, in the flow-directing cover, and through the engine fin in order to factor out the design parameters. Experimental study and optimization are conducted in two phases: the flow rate measurements and the around-cylinder temperature measurements. The flow measurements are completed by using the AMCA 210 standard fan test rig. While the temperature measurements are done by attaching 40 K-type thermocouples with 250 mm bead diameter to circumferential positions around the cylinder. The strategy of the optimization process is maximizing the fan flow rate first by modifying the fan inlet as well as the position and shape of the scroll. Then proceed to minimize the circumferential temperature distribution of the cylinder by optimizing a specially designed flow distributing plate, which is installed in the proper position and orientation of the flow-directing cover. It is found that the inlet diameter should be kept as large as that of the fan hub so that the fan flow rate is maximized. There is a specific design position for locating the cut-off. Deviating from the optimized design location, the flow rate deteriorates significantly. The flow rate is increased by about 25% compared with the original design after optimization. With this increased flow rate the circumferentially averaged temperature is decreased by about 19oC. However, the maximum temperature difference around the cylinder, i.e., the index for the temperature nonuniformility, attains 39oC. By properly installing the flow distributing plate, the flow rate is increased by about 22% compared with the original design after optimization. With this increased flow rate the circumferentially averaged temperature is decreased by about 16oC. However, the maximum temperature difference around the cylinder, i.e., the index for the temperature nonuniformility, attains 23.3oC.
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蔡協成. "Simulation and Analysis for Four-Stroke Motorcycle SI Engine Dynamic Performance." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/76218699471923983619.
Full textAbstract:
碩士大葉大學
車輛工程研究所
90
The purpose of this study is to establish a simulation program to evaluate the performance of a four-stroke, spark-ignited gasoline motorcycle engine. From the relationship between the engine performance and the operation variable and control parameters, the dynamic characteristics of the engine can be implemented. The engine output performance was tested under different testing conditions to analyze the internal correlation between performance and variables such as engine speed, intake manifold pressure, and spark advance etc. The assumptions and the approaching methods were modified by the experimental data to validate and to improve the performance predictions. The simulation program was based on the specific motorcycle engine test data; the related control system principles were incorporated to modify the dynamic performance response of the engine. The output of this simulation program including the engine speed and manifold pressure variation according to the variation of model input variables such as throttle position, engine load torque and fuel and spark control settings. The simulation program contains several submodels to calculate the needed parameters such as air-fuel ratio; volumetric efficiency to ensure different fuel mixture requirement can be achieved. The models were implemented through the graphic interface program into an integration interface between the engine performance and the control parameters and operating variables. This tool can be used in future EMS controller design and evaluation. This study compared the different engine dynamic performance during acceleration and deceleration and it also compared with the available correlation method from literatures. Measured dynamic performance data correlation can be used for future reference of the engine design and engine management controller settings. This study simulates the ignition timing control system, the test conditions set with different external loads and no-load. Compare the response results of power, torque and speed, the variable ignition timing controller can adapted the engine speed and load variation thus gave better performance. The simulation provides tools for future ignition module design and calibration. The simulation of fail-safe fuel injection system can show the corresponding performance drop for each or combined sensors failure conditions. The proper makeup for the substitution for other working sensor’s information can reduce the danger of failed sensor so that the engine can be safely operated. This fail-safe simulation provides the basis for evaluation of the fuel injection system design and improvement. With this dynamic performance simulation program, engineer can evaluate the variation in engine dynamic performance due to design change and different control settings, reducing the corresponding trial-and—error effort, saving the research and development time and cost.
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Lin, Hsin-Hong, and 林信宏. "An Investigation on Cranking Torque Reduction for Four-Stroke Motorcycle Engine." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/e4y5bx.
Full textAbstract:
碩士國立臺北科技大學
車輛工程系所
100
In order to reduce the emissions and improve the fuel consumption of scooter engines, idling-stop gradually regards as the key technology to solve this problem. However, the frequency of using starter motor is increased which affects the life time of battery and starter motor. For extending the life time of starter motor, a strategy of cranking torque reduction is needed. This research incorporates the stroke identification and the starter/generator with the programmable engine controller which allows the crankshaft not stops at compression stroke while the engine is turned off. Therefore, after the engine is turned off, this method could avoid the crankshaft remained at the bottom dead center of compression stroke which will result in the demand of higher cranking torque to overcome the compression pressure during the next cranking. As a matter of fact, higher cranking torque will conduct the problems on the reduction of starter motor life time and the enlargement of battery size. The starter/motor could also be worked in motor mode to assist the starter motor to crank the engine, and hence the instantaneous power provided by the starter motor could be reduced to extend its life time. The motor/generator will be operated in generator mode during vehicle operation for supplying the electric power. Finally, the experimental results show that these strategies could reduce the cranking torque of starter motor while the engine is cranking.
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江泓億. "Design and Fabrication of Carbon Composite Fixed Link for Motorcycle Engine." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/51591985637745059390.
Full textAbstract:
碩士逢甲大學
纖維與複合材料學系
103
The concept of energy saving and carbon reduction was promoting in the world at recent years, due to the rise of awareness of environment. The most effective way to increase fuel efficiency is reducing the weight of the parts in transportation. Therefore the concept of energy saving and carbon reduction can be achieved. In this study, using SolidWorks simulation to analyze engine fixed linking structure, in order to build an analyzing method to make the developing process more efficiently. And we use hot press method to manufacture the engine fixed linking structure with uni-directional (UD) carbon/epoxy prepreg, that the laminate degree have already designed, and is also covered by a woven carbon/epoxy prepreg on structure surface. During the engine fixed linking structure was used, there are many kinds of force to load the structure, such as tension, compression, and bending forces. The results of this study were showed that the weight of structure that made by carbon composite compared with aluminum alloy linking structure has decreased about 48.25 %; however their mechanical properties were enhanced. The sample named UD012 linking structure, which has more 0 degree layers, its tensile and compression modulus are the best out of the materials and laminate degrees in this study, compared to aluminum alloy linking structure; it was increased by 75.48 % and 92.37% respectively. The sample named UD08 linking structure, which has more 45 degree layers higher tensile, compression and bending strength, compared to aluminum alloy linking structure, it was increased by 93.72 %, 43.34 % and 57.74 % respectively.
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Chen, Wei-Lin, and 陳韋霖. "Optimized Design on Combustion Chamber Pent Roof of a Motorcycle Engine." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/30538476576464879907.
Full textAbstract:
碩士國立臺灣科技大學
機械工程系
105
The in-cylinder flows in the axial planes of a motored four-valve, single-cylinder, four-stroke engine during the intake and compression strokes at an engine speed 5000 RPM were diagnosed by using computational methods. The engine head had a pent roof configuration. The present research was aimed on probing the influences of the pent roof geometry on the in-cylinder tumble strength. The computations were carried out by the computational fluid dynamic (CFD) software CONVERGE. The in-cylinder cold flow CFD simulation model of the original combustion chamber and the optimized combustion chamber based on CONVERGE software were built and performed. Moderate and intense tumble motion were generated by changing the combustion chamber geometric design. Quantified strengths of the rotating motions in the axial planes were represented by a dimensionless variable tumble ratio, which was defined as the ratio of mean angular velocity of the vortices in the target plane at a certain crank angle to the average angular velocity of the crank. The quantitative results of cycle-averaged tumble ratio indicated the correlation between strengths of tumble motion and combustion chamber geometric design. The calculated results and analyses showed that the primary parameter influencing the tumble ratio was the inlet inclination angle of the pent roof (θ1). The secondary parameters were the pent roof exhaust inclination angel (θ2), radius of pent roof (R1), and radius of pent roof on the upper edge (R2). When optimizing the pent roof design, the primary parameter should be determined prior to the secondary parameters. According to the results, the maximum tumble ratio was observed as the inlet inclination angel, exhaust inclination angel, radius of pent roof, and radius of pent roof on the upper edge were 22⁰, 20⁰, 7 mm, and 10 mm, respectively.
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Liu, Yen-liang, and 劉彥良. "Design and Analysis in the Flow-directing Cover of Motorcycle Engine." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/34536905196123372311.
Full textAbstract:
碩士義守大學
機械與自動化工程學系碩士班
97
The flow-directing cover of the four -stroke engine was designed using CAD software to improve the flow rate, and the internal grid patterns were constructed GAMBIT software. The flow field inside the flow-directing cover was analyzed by CFD software (i.e. Fluent) and a flow bench was used to measure the performance of the flow-directing cover. The study uses numerical simulation method to analyze and design the flow-directing cover. The design process is divided into 7 parts: 1. The simulated and experimental results of the flow-directing cover are compared together to evaluate the practicability and accuracy of the theoretical model. 2. Design the flow path inside the flow-directing cover. 3. Design the tube with fan in chain side. 4. Design the volume of the chain side. 5. Design position and angle of the tube in chain side. 6. Design the diameter of the tube. 7. Design the outlet direction of the flow-directing cover. The results show that the tube at the upper central part by the side of the chain can increase the flow efficiency by 16.47% in average. In addition, installing a fan inside the tube can increase the flow efficiency by 49.22% in average. As the diameter of the tube becomes greater, the outflow at the outlet relatively increases. But it will affect the distribution of flow field. The outlet of flow-directing cover at the left hand side of the chain can increase the flow efficiency by 18.91% in average. The outlet flow rate has improved very much compare with original design. therefore, the design of this system can provide a better heat dissipation efficiency for the motorcycle engine.
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Prabhu, Nishikant Madhusudan. "Fuel Filim Visualization And Measurement In The Inlet Manifold Of A Carbureted Spark-Ignition Engine." Thesis, 2008. http://etd.iisc.ernet.in/handle/2005/2251.
Full textAbstract:
In order to meet future emission norms for small carbureted SI engines, such as those
used on motorcycles in India, there is a need to study mixture preparation, specifically the two-phase flow exiting the carburetor and entering the inlet manifold. A fully functional, modular experimental rig is designed and erected for performing both
qualitative and quantitative flow visualization. The vibrations of the engine are minimized to reduce their effect on the flow. A special, optically accessible tube of
square cross-section is added between the carburetor and the inlet manifold, to enable
the visualization of flow at the exit of the carburetor. An electronic circuit to obtain a
signal for the engine crank angle and convert it to a standard TTL pulse, for use on standard imaging systems to capture cycle resolved-images is also designed.
The flow in the optical section is qualitatively visualized using high and low
speed cameras. The resulting images and movies show two modes of fuel transport
within the inlet manifold, one of which is in the form of a dense cloud of fine fuel
droplets during some part of the intake stroke. The second mode is in the form of a
film at all times in the cycle, along the lower surface of the inlet manifold during
idling and along vertical walls under loaded conditions. Recirculation is seen on the
vertical walls of the manifold during idling and under load.
Finally, the thickness of the fuel film in the optical section at the exit of the
carburetor is measured, using PLIF. This part of the study also reveals that there is a film on upper surface of the optical section, at all loads and speeds. This film is lesser than the resolution of measurement for low loads, and increases to 0.5 mm in the case of highest load and speed attained at full throttle. In contrast to the loaded conditions, during idling, the film occurs on the lower surface of the manifold and its thickness is highest (1 mm.). The film is also present throughout the cycle during idling and all load-speed conditions, suggesting that the mixture that goes into the engine has a significant part of fuel in liquid form.
45
Lin-yiyu and 林益裕. "Studies on the effect of engine vibration on the motorcycle frame vibration." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/75118506195933202580.
Full textAbstract:
碩士國立中興大學
機械工程學系
93
Computer-Aided Design (CAD) engineering is widely applied in the industry. Product quality not only can be greatly improved, but also the development and cost can be reduced to upgrade efficiency from design to time-to-market via CAD technique. Therefore, CAD capability and usage can be an important index for R&D design in the industry. Pro/ENGINEERG is 3D CAD DATA software widely used in the industry. ADAMS is mechanical and dynamic simulation software, which is used to analyze the motion and dynamics for mechanical structure as well as widely used to verify product design and development in the vehicle industry. Therefore, we not only adopt more than two sets of software to establish and analyze 3D CAD DATA, but also measure experimental data on automobile. Moreover, we also use motorcycle model simulated by ADAMS to compare accuracy and reliability. Using this software can simulate the mechanical dynamic behavior and test of vehicle in computer. The simulation can be quickly analyzed and the actual situation can be met.
46
Chen, Tung-Chieh, and 陳東杰. "The Development of Closed Loop Fuel Injection Controller for a Motorcycle Engine." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/15203157765794368731.
Full text
47
Chiu, Yen-kai, and 邱彥凱. "Development of GDI Technology in a Two-Valve, Single-Cylinder Motorcycle Engine." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/95988719683650059945.
Full textAbstract:
碩士國立臺灣科技大學
機械工程系
96
The objective of the study is that change Two-Valve, Single-Cylinder Motorcycle Engine into GDI Engine, and to mainly analyze the influences of geometric parameter and physical parameter in GDI Engine performance. In addition, you can compare the revised geometric parameter and revised physical parameter with the experimental results and find out the feasibility of excellent engine performance and the pollutant. In this study, I divide the experiment into two segments. The first segment is to examine the characteristic of the fuel injector which using high speed camera to measure the time delay, and also it is the reference for fuel injection timing. The experimental result shows that the different duration of fuel injection has the same time delay. The two main points for the second segment are to examine the performance of the engine, and compare two types of the cylinder head’s performance. The experimental result of this is that one of them has better performance than the other.
48
Hsiung, Hsiang-Ming, and 熊湘明. "Parametric Study of a Four-Stroke Motorcycle Engine with Fuel Injection System." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/37428268291221194190.
Full textAbstract:
碩士國立臺北科技大學
車輛工程系碩士班
92
This research is a parametric study for a commercialized four-stroke 125c.c. electronic fuel injection (EFI) motorcycle engine. The electronic control unit (ECU) with 8-bit of original engine is replaced by a Motorola MC68376 32-bit microprocessor, The main purpose is to study effects of injection timing and spark advance on engine combustion characteristics and performance at various engine speed and throttle position. Then, relationship between the control variables, injection timing and spark advance, and engine performance will be set up. The conclusions from exponential results are as follows: 1. It will be easier and more flexible to adopt the embedded control system for the varies of engine control parameters. And it can reduce the time and cost for engine control system design. 2. Fuel injection timing should be varied according to the condition of engine speed and throttle position. The excess advance or delay of spark timing will affect severely to engine performance, fuel consumption, and exhaust emissions. Furthermore it will even cause engine misfire. 3. The horsepower and torque of an engine with spark timing varies with engine speed only are lower than that of an engine with spark timing varies with speed and load. The previous one also causes higher specific fuel consumption. Therefore, spark timing has to be properly controlled according to engine speed and load. 4. In the same throttle position, the minimum-spark-advance for beset torque (MBT) will be a little advanced with the increase of engine speed. That will increase the engine performance and reduce fuel consumption and exhaust emission. The experimental results of this thesis will provide a good reference for the design of motorcycle fuel injection system control. Furthermore it can reach the purpose of energy-saving, low exhaust emissions, and high engine performance.
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Lo, Shih-Ting, and 羅士庭. "The study on four-stroke motorcycle engine performance and exhaust emissions using engine oil with nano silica additive." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/v6kp39.
Full textAbstract:
碩士國立臺灣師範大學
工業教育學系
106
In this study, nano silica (nano SiO2) was added in to the original named engine oil. It also be experimented on the four-stroke motorcycle. The characteristics of driving-experiment, which includes speed performance, specific fuel consμmption, and the exhaust emissions, such as HC, CO and PM, were estimated as experimental results for the further benefit evaluation. Nano SiO2-engine oil with 0.5, 1.5, 2.5, 3.5 and 4.5 wt.% included have been conducted. It came out that the best tribology experimental came to the engine oil with 3.5 wt.% nano SiO2 added. During the tribology experimental of nano SiO2-engine oil, the engine oil with 3.5 wt.% nano SiO2 added decreased an average of 42.42 % abrasion loss. The fuel consμmption (km/L), climbing capacity, constant velocity testing. The engine oil with 3.5wt.% nano SiO2 added increased the fuel consμmption, speed of fixed throttle testing, climbing capacity and 0.3μm particle with 15.22 %, 10.3 %, 15.78 % and 142.48 %, respectively. Besides, it also decreased the CO and HC with 16.9 % and 8.36 %, respectively. Overall, the engine oil with 3.5 wt.% nano SiO2 added improved the effect of lubricating. In the future, the examination of nano material includes motorcycle fuel consμmption, engine temperature and exhaust emissions would be conducted.
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Wu, Chang Tai, and 巫昶泰. "Simulation of catalyst deterioration and the effect of misfire on the emission and engine performance of motorcycle engine." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/30656869372672993312.
Full textAbstract:
碩士國立中興大學
機械工程學系所
101
A novel approach to simulate the catalyst deterioration and the effect of misfire on emission and engine performance are discussed in this paper. In the development of the OBD system of a vehicle, an aged catalyst is required to test the function of the system. This catalyst is partially deteriorated and the emission after this catalyst will exceed the regulation value with limited bound according to the testing protocol. This aged catalyst is very valuable, and difficult to prepare. A bypass in the exhaust pipe was used to simulate the deterioration of catalyst in this paper to investigate the emission characteristics of a motorcycle engine. This method of simulation has been conducted in a dynamometer testing and a chassis dynamometer testing. An electronic controlled motorcycle engine was used in these tests. Wind band oxygen sensors’ signals were used to calculate the catalyst deterioration index. The result shows that the degree of deterioration can be controlled by the portion of exhaust flow through the parallel pipe. A low dimensional catalyst model was built to confirm the practicability of the exhaust system made in this paper. A misfire generator based on single chip was developed in this paper to investigate the effect of misfire on the emission and engine performance of a single cylinder motorcycle engine. The results of the engine dynamometer tests show that the concentration of unburned hydrocarbons in the engine exhaust was raised and the engine torque declined as the misfire rate increased. At low load, CO concentration increased with the misfire rate while CO2 moved in an opposite direction. Contrary condition happened at high load. The CO2 concentration increased with the misfire rate while CO varied in the opposite way.