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Dissertations / Theses on the topic 'Idle engine'
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Besson, Vincent. "Parameter space robust control for S.I. engine idle speed." Thesis, University of Liverpool, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366369.
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Chandramouli, Nitish. "Engine Idle Sailing with Driver Assistant Systems For Fuel Consumption Minimization." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1523531254267084.
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Ajovalasit, Marco. "Effect of fuel content on the human perception of engine idle irregularity." Thesis, University of Sheffield, 2006. http://etheses.whiterose.ac.uk/15056/.
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This thesis describes a digital signal processing analysis of diesel engine idle vibration in automobiles, and an analysis of the human subjective response to the idle vibration which occurs at the steering wheel. In order to quantify the variations in the diesel idle vibration that can be introduced by the engine technology, the vehicle, and the fuel type, a set of acceleration time histories were measured at the engine block and at the steering wheel for two automobiles equipped with 4-cylinder engines which had different injection systems and which operated under different fuel conditions. A combination of time domain, frequency domain and time-frequency wavelet-based analysis were used. Both the continuous wavelet transform and the discrete orthogonal wavelet transform were applied to the steering wheel acceleration time histories in order to analyse the statistical variation in terms of both instantaneous variations, and the cycle-to-cycle variations which occur across complete thermodynamic engine cycles. The combination of orthogonal wavelet transform and time-varying auto-covariance analysis, performed across a complete engine thermodynamic cycle, was identified as the most sensitive method for describing the statistical variation in diesel idle vibration. The second-order engine harmonic H2 was found to account for most of the vibrational energy at the steering wheel when at idle. Amplitude modulation of the second-order engine harmonic H2 by the half-order engine harmonic H112 has been identified as the main characteristic of the steering wheel signature of automobiles at idle. The steering wheel idle vibration produced by different engines and different fuel conditions have therefore been described in terms of the amplitude modulation depth "mil that characterises the idle waveform. Four psychophysical response tests, determined by the combination of two test protocols and two semantic descriptors, were performed. A model of the growth in the human subjective response to diesel idle vibration has been proposed in which the response scale is a function of the modulation depth parameter "mil. The model is defined over two regions of modulation depth. For values of "m" less than 0.2, humans have been found to be unable to distinguish variations in idle modulation. For values of "m" greater than 0.2, the human response grows as a power function with respect to modulation depth. Based on the current findings, suggestions for future research are also provided.
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Hinze, Peter C. (Peter Christopher). "Cycle-to-cycle combustion variations in a spark-ignition engine operating at idle." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10243.
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Joy, Tony. "A Robust QFT Control Approach for Automobile Engine Idle Speed Systems: Modeling, Design and Simulation." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1464794127.
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Dimou, Iason. "Particulate matter emissions from a DISI engine under cold-fast-idle conditions for ethanol-gasoline blends." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67777.
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Thesis (Nav. E. and S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 81-83).
In an effort to build internal combustion engines with both reduced brake-specific fuel consumption and better emission control, engineers developed the Direct Injection Spark Ignition (DISI) engine. DISI engines combine the specific higher output of the spark ignition engine, with the better efficiency of the compression ignition engine at part load. Despite their benefits, DISI engines still suffer from high hydrocarbon, NO2 and particulate matter (PM) emissions. Until recently, PM emissions have received relatively little attention, despite their severe effects on human health, related mostly to their size. Previous research indicates that almost 80% of the PM is emitted during the first few minutes of the engine's operation (cold-start-fast-idling period). A proposed solution for PM emission reduction is the use of fuel blends with ethanol. The present research experimentally measures the effect of ethanol content in fuel on PM formation in the combustion chamber of a DISI engine during the cold-start period. A novel sampling system has been designed and combined with a Scanning Mobility Particle Sizer (SMPS) system, in order to measure the particulate matter number (PN) concentration 15 cm downstream from the exhaust valves of a DISI engine, for a temperature range between 0 and 40"C, under low load operation. Seven gasohol fuels have been tested with the ethanol content varying from 0% (EO) up to 85% (E85). For E10 to E85, PN modestly increases when the engine coolant temperature (ECT) is lowered. The PN distributions, however, are insensitive to the ethanol content of the fuel. The total PN for EQ is substantially higher than for the gasohol fuels, at ECT below 20'C. However, for ECT higher than 20'C, the total PN values (obtained from integrating the PN distribution from 15 to 350 nm) are approximately the same for all fuels. This sharp change in PN from EQ to E10 is confirmed by running the tests with E2.5 and E5; the midpoint of the transition occurs at approximately E5. Because the fuels' evaporating properties do not change substantially from EQ to E10, the significant change in PN is attributed to the particulate matter formation chemistry.
by Iason Dimou.
Nav.E.and S.M.
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Milhor, Carlos Eduardo. "Proposta de um controlador difuso Takagi-Sugeno com desempenho H \'INFINITO\' para regulagem da marcha lenta em motores de ciclo Otto." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-21012011-141452/.
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Propõe-se um controlador difuso Takagi-Sugeno com índice de desempenho H \'INFINITO\' para regulagem da marcha lenta em motores de ciclo Otto. Obtém-se uma representação difusa do motor de ciclo Otto operando em marcha lenta. Esse modelo é utilizado para a síntese do controlador. O controlador difuso com desempenho H \'INFINITO\' é projetado para rejeitar o efeito de distúrbios de cargas externas sobre a rotação do motor em regime de marcha lenta. As ações de controle, posição da borboleta de aceleração e ponto de ignição, são limitadas a uma faixa de operação específica para a marcha lenta. O controlador projetado apresenta ação de controle por realimentação de estados. Os ganhos de realimentação para cada regra do controlador difuso são obtidos a partir de um problema de otimização formulado através de LMIs.It is proposed an Otto cicle engine idle speed H \'INFINITE\' Takagi-Sugeno fuzzy control. It is presented an Otto cicle engine idle speed fuzzy model. This model is then used to control design. The H \'INFINITE\' fuzzy control is designed to reject external load disturbance effect at idle speed engine rotation. A specifc idle speed operation range is defined to both actions control, throttle plate position and spark advance. A state feedback control is designed. A LMI optmization problem is used to find the state feedback gains at each fuzzy control rule.
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Vinay, Kumar Nerella V. "An Analysis on Vehicular Exhaust Emissions from Transit Buses Running on Biodiesel Blends." University of Toledo / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1271886446.
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Viyyuri, Ravi Shankar viyyuri. "Real-Time Exhaust Gas Emission Analysis on Public Transport Buses Equipped with Different Exhaust Control Systems." University of Toledo / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1525131853848906.
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Thornhill, Michael Joseph. "Idle speed control of spark ignited engines." Thesis, Queen's University Belfast, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286863.
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Pereira, Bruno César Fernandes. "Evolução de uma unidade de gerenciamento eletrônico de um motor VW 2.0L e desenvolvimento de controle de cruzeiro: Projeto Otto IV." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3142/tde-10112017-111401/.
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Com o passar do tempo, nota-se um aumento gradativo da demanda por veículos mais econômicos e que disponham de itens capazes de aumentar o conforto e a segurança. Citase, como exemplo, o controle de cruzeiro (Cruise Control) que, atualmente presente em diversos veículos, é responsável por controlar a velocidade do veículo de maneira autônoma, sem a necessidade de intervenção do condutor no pedal de aceleração, resultando em um aumento de conforto ao reduzir o esforço para dirigir, além de prover efetividade para manter a velocidade do veículo em torno de um valor desejado. Neste contexto, o presente trabalho apresenta o desenvolvimento de um controlador de cruzeiro para operar em um veículo modelo Volkswagen Polo Sedan 2.0L 2004, o qual não possui este recurso em seu estado de fábrica. Para a implementação deste recurso, o trabalho faz uso de uma unidade de gerenciamento eletrônico (conhecida também por Electronic Control Unit - ECU) desenvolvida em 2013, no âmbito do projeto Otto II (PEREIRA, 2013), para controle do motor presente no respectivo veículo, viabilizando, desta forma, a validação do controle de cruzeiro por meio de testes utilizando o veículo em um dinamômetro inercial. Entretanto, previamente ao projeto do controlador de cruzeiro, o presente trabalho teve como foco o aperfeiçoamento do funcionamento desta ECU, visando a sua evolução no que diz respeito ao estado da arte de unidades de gerenciamento eletrônico de motores. Para isto, em sua primeira fase, o trabalho realizou diversas melhorias nas malhas de controle já existentes no firmware de 2013, tais como controle de marcha lenta, controle da borboleta eletrônica e controle de partida. Ao mesmo tempo, novos recursos foram implementados em firmware: controle de torque, controle da mistura ar/combustível em malha fechada (sonda lambda), segurança na comunicação entre blocos da ECU, identificação de marcha, suporte para diagnóstico via OBD-II, dentre outros. Além destas atividades envolvendo desenvolvimento de firmware, o trabalho, ainda em sua primeira fase, promoveu o desenvolvimento de uma nova ferramenta de software que, além de ser capaz de monitorar diversos parâmetros da ECU em tempo real, integra diversas funções, tais como função de computador de bordo alternativo, opção para controle do motor através da simulação do pedal de aceleração, opção para alteração da rotação de marcha lenta e função para automatização do ensaio de identificação do veículo (tarefa necessária para o projeto do controlador de cruzeiro).Over time, there is a gradual increase of the demand for economical vehicles equipped with items capable of increasing the comfort and safety. As an example, the Cruise Control, which is already available in several vehicles, is responsible to control the vehicle speed in an autonomous manner, without the driver intervention on the throttle pedal. As a result, a greater comfort is achieved by reducing the effort to drive, besides providing effectiveness to keep the vehicle speed around a desired value. In this context, this project aims the development of a Cruise Control applied to a vehicle Volkswagen Polo Sedan 2.0L 2004, in which such resource is not available. To implement this resource, the project uses an electronic engine management unit (also known as Electronic Control Unit - ECU) developed in 2013 by the Otto II project (PEREIRA, 2013). This ECU is responsible to control the engine of the respective vehicle, which allows the Cruise Control validation through a set of tests performed with the vehicle on an inertial dynamometer. However, prior to the Cruise Control design, this project focused on the ECU operation enhancement, in order to achieve the state of the art in electronic engine management units. For this goal, the project, during its first phase, performed several improvements on the control algorithms already existing in the firmware developed in 2013, such as idle speed control, electronic throttle valve control and engine starting control. At the same time, new features were fully implemented in firmware: torque control, closed loop air/fuel ratio control (lambda control), safety for the communication among ECU blocks, gear identification, support to OBD-II diagnostic, among others. In addition to the firmware development activities, the project, still in its first phase, developed a new software tool capable of monitoring several ECU parameters in real time, besides providing many functions, such as alternative board computer, an option to control the engine by simulating the throttle pedal, an option to change the idle speed and a function to automate the system identification test (task required for the Cruise Control design).
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Petrovay, Gabriel. "XQuery (scripting) debugging IDE and engine support /." Zürich : ETH, Swiss Federal Institute of Technology Zurich, Department of Computer Science, Databases and Information Systems Group, 2008. http://e-collection.ethbib.ethz.ch/show?type=dipl&nr=366.
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Ketterer, Justin Edward. "Soot formation in direct injection spark ignition engines under cold-idle operating conditions." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/85538.
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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2013.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 167-175).
Direct injection spark ignition engines are growing rapidly in popularity, largely due to the fuel efficiency improvements in the turbo-downsized engine configuration that are enabled by direct injection technology. Unfortunately, direct injection spark ignition engines also emit higher concentrations of particulate matter than conventional port fuel injected engines. In light of evidence linking particulate matter to adverse human health impacts, particulate emissions standards have been strengthened in both the United States and in Europe. A great deal of research seeking particulate emissions reductions is ongoing. This study contributes to this body of research by offering a refined explanation of the soot formation process in direct injection engines under cold-idle operating conditions. A number of engine and rapid compression machine experiments were conducted in order to understand the impacts of engine operating conditions and fuel composition on particulate matter emissions. Using these data, a conceptual model describing the formation of soot in direct injection engines is outlined. This model suggests that soot forms after the main combustion event in fuel vapour plumes surrounding liquid fuel films on cylinder surfaces through pyrolytic reactions enabled by heat transfer from burned gases from the primary combustion event.
by Justin Edward Ketterer.
Ph. D.
14
Laurain, Thomas. "Synthèse de contrôleurs avancés pour les systèmes quasi-LPV appliqués au contrôle de moteurs automobiles." Thesis, Valenciennes, 2017. http://www.theses.fr/2017VALE0033/document.
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Ma thèse en automatique s’inscrit dans la thématique de recherche «Transport» du LAMIH. L’objectif est d’améliorer le fonctionnement des moteurs thermiques (essence), notamment en réduisant la consommation et la pollution. Face à cet enjeu écologique et économique, et compte tenu des nouvelles normes et des stratégies court-termistes de l’industrie (scandale Volkswagen...), de nouveaux contrôleurs doivent être conçus pour piloter l’arrivée d’air et d’essence au sein du moteur. En considérant l’aspect hautement non-linéaire du système, la représentation Takagi-Sugeno et le background théorique du LAMIH sont utilisés. Un premier contrôleur est synthétisé pour régler le problème de la vitesse de ralenti du moteur. Cependant, la complexité du système impose l’utilisation d’un contrôleur très coûteux d’un point de vue computationnel. Un contrôleur alternatif est donc synthétisé afin d’être implémenté dans l’ordinateur embarqué du moteur. Un second contrôleur est obtenu pour maintenir la richesse en proportions stoechiométriques afin de réduire la pollution. Ce système étant sujet à un retard de transport variable, un changement de domaine est réalisé afin de rendre ce retard constant, et de concevoir un contrôleur simple et efficace. Des essais réels sur le banc d’essai moteur du LAMIH sont réalisés afin de valider la méthodologie présentéeMy PhD in Automatic Control is part of the research theme “Transport” of the LAMIH. The objective is to improve the functioning of the gasoline engines, mainly by reducing the fuel consumption and the pollution. With this ecologic and economic challenge, and taking into account the new norms and the short-term strategies of the industry (scandal of Volkswagen...), new controllers have to be designed to control the air valve and the fuel injection inside the engine. Considering the highly nonlinear aspect of the system, the Takagi-Sugeno representation and the theoretical background of the LAMIH have been used. A first controller is designed to solve the problem of idle engine speed. However, the complexity of the system forces the use of a controller that is very costly from a computational point of view. An alternative controller is then designed in order to be implemented inside the embedded computer of the engine. A second controller is obtained to maintain the air-fuel ratio in stoichiometric proportions in order to reduce the pollution. This system being subject to a variable transport delay, a change of domain is realized to make this delay constant, and to design a simple and efficient controller. Real-time experiments have been realized on the engine test bench of the LAMIH in order to validate the presented methodology
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Garimella, Venkata Naga Ravikanth. "Exhaust Emissions Analysis for Ultra Low Sulfur Diesel and Biodiesel Garbage Trucks." University of Toledo / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1290203383.
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Hasan, Mohammad Rashedul. "Separation and Execution of graphical engine on a cross platform IDE to enhance performance." Thesis, Högskolan Dalarna, Datateknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:du-5264.
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“Biosim” is a simulation software which works to simulate the harvesting system.This system is able to design a model for any logistic problem with the combination of several objects so that the artificial system can show the performance of an individual model. The system will also describe the efficiency, possibility to be chosen for real life application of that particular model. So, when any one wish to setup a logistic model like- harvesting system, in real life he/she may be noticed about the suitable prostitution for his plants and factories as well as he/she may get information about the least number of objects, total time to complete the task, total investment required for his model, total amount of noise produced for his establishment in advance. It will produce an advance over view for his model. But “Biosim” is quite slow .As it is an object based system, it takes long time to make its decision. Here the main task is to modify the system so that it can work faster than the previous. So, the main objective of this thesis is to reduce the load of “Biosim” by making some modification of the original system as well as to increase its efficiency. So that the whole system will be faster than the previous one and performs more efficiently when it will be applied in real life. Theconcept is to separate the execution part of ”Biosim” form its graphical engine and run this separated portion in a third generation language platform. C++ is chosenhere as this external platform. After completing the proposed system, results with different models have been observed. The results show that, for any type of plants of fields, for any number of trucks, the proposed system is faster than the original system. The proposed system takes at least 15% less time “Biosim”. The efficiency increase with the complexity of than the original the model. More complex the model, more efficient the proposed system is than original “Biosim”.Depending on the complexity of a model, the proposed system can be 56.53 % faster than the original “Biosim”.
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Lin, Yang-Cheng, and 林揚城. "Model Predictive Control for Scooter Engine Idle Speed." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/22y34g.
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碩士國立臺北科技大學
車輛工程系所
96
A multi-input single-output (MISO) controller using model predictive control is proposed for idle speed control in this thesis. The spark advance and idle-air-control valve opening are simultaneously employed as control inputs for maintaining the desired idle speed. Unlike the conventional algorithm which uses the idle-air-control (IAC) valve as the only actuator. The recursive least square technique is employed to identify the engine as a first-order linear model. A nonlinear engine model established in Matlab/Simulink is used to evaluate the proposed and conventional algorithms. The proposed algorithm is also implemented on a scooter engine using the electronic control unit from Mototron. Both simulation and experimental results show that the proposed algorithm has less speed deviation than the conventional one under the presence of torque disturbances and that of model uncertainties.
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Liang, Yao-Chung, and 梁耀中. "Application of Adaptive Idle Speed Control on V2 Engine." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/aygze9.
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碩士國立臺北科技大學
車輛工程系所
102
Due to deposits or different dynamic characters that exist in different opening of Throttle, this thesis develops an adaptive idle speed control strategy for a V2 range extender engine. Adaptive controller is developed on the model based structure. The plant model will be represented by one dimensional air intake and torque dynamic. The integration of dynamic above will be a multi-input-single-output (MISO) system. The system parameters are updated by recursive least square (RLS) method, therefore the system is able to represent the actual operation. The updated system parameters adjust control gain by derivation of closed-loop gain and pole placement. This thesis also applies RLS method in torque load identification, and uses feedforward control module to calculate the desired throttle opening for the correspond torque. Therefore the tracking time could be reduced. The results of feedforward control are obviously improved from traditional control by 10%. As deposits happened, the results of adaptive control are improved from traditional control by 13%. While feedforward control is added, the results could be improved by 22%.
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李承祐. "Intelligent Idle Speed Control for Automobile Engine under Different Driving Conditions." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/47598233280875603487.
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碩士國立交通大學
電控工程研究所
102
In this thesis, the objective is to design a Fuzzy Logic Controller (FLC) for electronic throttle and implement the proposed method on idle speed control and driving control. The experimental car in this thesis is Saab 9000 CSE (1994), which was produced by the Swedish company Saab. Besides, we adopt the electronic throttle (ET) of Saab-91-88-186, which has been used in Saab 95 from 1998. To implement our proposed method, a micro controller Baby Orangutan B-328, from the company Pololu, is chosen owing to its small size. This controller is compact but complete, which use the same core as Arduino UNO, the controller that we used previously. However, the electronic throttles used in the modern cars usually need 12V/5A power. Therefore, an H-bridge and an Optocoupler are used to step up voltage and current. In this thesis, a feedback control scheme using fuzzy logic control (FLC) is presented. Moreover, for real-time control, an off-line discrete fuzzy look-up table is adopted. Proven by the experiments in cars, the controller can open the electronic throttle valve to desired angles for idle speed control or driving control. Besides these two modes of automobile control, the other applications like the heavy turbo charger control, automatic pressure control (APC), or cruise control, can be discussed in the future researches.
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Hendricks, Terry L. "Numerical and experimental fuel flow analysis of small engine carburetor idle circuits." 2007. http://catalog.hathitrust.org/api/volumes/oclc/153255810.html.
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Thesis (M.S.)--University of Wisconsin--Madison, 2007Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 161-165).
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Murillo-Sanchez, Carlos E. "Robust performance analysis of the idle speed control of a spark ignition engine." 1991. http://catalog.hathitrust.org/api/volumes/oclc/25266157.html.
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Thesis (M.S.)--University of Wisconsin--Madison, 1991.Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 109-116).
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Wu, Dong-Han, and 吳東翰. "Study on re-starting characteristics of a motorcycle engine performing auto-idle-stop strategy." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/31940093340388012240.
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碩士崑山科技大學
機械工程研究所
100
In this study, the re-starting characteristics of a motorcycle engine under idle-stop were investigated. Generally when turning off the engine, there is often incomplete combustion of fuel attached to the catalyst; or when restarting engine, the air-fuel mixture will become rich to cause the incomplete combustion. After 12,315 cycles of testing, it was found that the increase of CO and HC emissions were not serious. The surfaces of new and the used catalysts were observed by using the scanning electron microscope and energy dispersive spectrometer analysis. The carbon deposit were found on the catalyst surface, namely, the deterioration of the exhaust pollution control unit under idle-stop was not significantly. Another aim of this study was to shorten the engine re-starting time, reduce energy consumption and pollution emissions during start-up. In the initial stage of the study, the gear ratio of the starter was changed, and the parameters of the engine speed and cylinder pressure and the starting motor current were measured and analyzed. The results showed that supplying the fuel as the engine was stopped completely or before the piston was stopped would give the quicker restarting characteristics.
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Lee, WangShuan, and 李旺軒. "The Application of Controller Area Network Technology in Vehicle Battery and Engine Idle Speed Control." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/38341244331290778463.
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碩士國立彰化師範大學
機械工程學系
90
The requirements relating to driving safety, driving comfort, exhaust emissions and fuel economy for vehicles are becoming more and more stringent. This entails more electronic control units and more complex wiring systems in the vehicle, and more intensive information exchange between control units. A well-engineered solution is necessary to reduce the size and weight of wiring harness and to ensure that the vehicle’s quality and reliability can be maintained, or even improved. One of the technologies to achieve these goals is the vehicle control network. In a vehicle control network, each node can access the network bus and share data with one another. Currently most widely used vehicle control network is the controller area network (CAN), which is one of the focuses of this study. By applying CAN technology, whenever the starting motor, air conditioning, lighting system and power windows are functioning, these signals are acquired by a notebook through data acquisition card (DAQ card). The data are encapsulated into CAN frames and sent to central control computer (a desktop) through CANbus. The desktop then decodes the frames, calculates the corresponding optimal engine idle speed, and sends out the control signal through another DAQ card to the idle air control valve stepping motor to adjust the engine idle speed. In the future, a smart transducer, which can measure the current and voltage of in-vehicle electrical devices, will be developed. Also, based on CAN technology, the vehicle’s battery-residual-energy can be calculated and displayed on vehicle’s instrument panel for real-time monitoring.
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Chi, Ching-Sheng, and 冀慶生. "Applying Digital MIMO Dynamic Sliding Surface Control to Idle Speed Control of Spark Ignition Engine." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/9tycmk.
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博士義守大學
電機工程學系
105
The good idle speed control of spark ignition engine makes the customers comfortable and drives smooth. To derive its controller, a control-oriented object based model of spark ignition engine is discussed in this paper. To achieve accuracy tracking and reduce the control effort, a digital MIMO dynamic sliding surface control rule is proposed in this paper. The sliding mode controller will drive the system to racking the desired esponse. The existence condition of the discrete sliding mode is expanded to two conditions. The first one is used to keep the sliding motion toward to the sliding urface. The next one is to keep the sliding motion convergent. The dynamic sliding surface will decrease the approaching time. At the same time, the output magnitude of the switching part will be reduced efficiently. Finally, the simulation results will demonstrate the performance of the proposed control rule. The different working conditions will show the robustness of the proposed controller for parameter variation and the external load.
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Yu, Chien-Tsung, and 尤建忠. "Adjusting Model of Base Idle Speed for Gasoline Engine Based on Adaptive Network-Based Fuzzy Inference System." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/34551209507224255471.
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碩士國立高雄第一科技大學
機械與自動化工程所
94
Abstract In this thesis, we adopt the experimental way to collect the revolution datas of the base idle speed for the gasoline engine. In our experiments, we use the intake valve clearance, the exhaust valve clearance and the ignition timing as the input variables and the engine revolution as the output variable. Through the training and examining of adaptive network-based fuzzy inference system (ANFIS), we can carry out the construction of predicting model to provide the available reference for maintenance operators'' adjustment the base idle speed of the gasoline engine. It is available not only to save the adjusting time and labor, but also reach the higher quality. In this thesis, for getting the better learning effect, we firstly propose the larger-is-better performance for the engine revolution as the quality feature. By using the Taguchi method, we can find out the significant factor for the said predicting model. Following that, we increase the levels of the mentioned-above significant factor to improve the learning iii effect of the predicting model. Then, we plan the training experiments and the examining experiments for the predicting model, respectively. Therefore, we obtain the training datas and the examining datas, respectively. The training datas are applied to construct the predicting model for the base idle speed of the engine revolution. In addition, the examining datas are employed to examine the accuracy for the said predicting model. At the same time, in the ANFIS, the types of membership function for the antecedent part will affect the accuracy of the predicting model. We will study the effect of membership function included 4 types (triangle function, trapezoid function, bell-shape function and Gauss function) on the accuracy of the predicting model, so that we can select the better membership function of the antecedent part for the predicting model. In the experimented example, we can find that the bell-shape membership function can get the least error and its output values are for the said predicting model much closer to the experimental values.
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(6787271), Kalen Vos. "Utilizing Valvetrain Flexibility to Influence Gas Exchange and Reduce Reliance on Exhaust Manifold Pressure Control for Efficient Diesel Engine Operation." Thesis, 2019.
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Environmental health awareness has elevated in recent years alongside the evidence that supports the need to mitigate harmful greenhouse gas (GHG) emissions
from non-renewable energy resources. The transportation sector alone significantly
contributes to the pollutants on a global scale. Although it is commonly used for
its superior energy-density and fuel efficiency, diesel engines are a significant portion
of the transportation sector that contributes to these pollutants. As a result, this
motivates novel research to simultaneously drive fuel efficiency improvements and
emissions reductions. The aftertreatment system for a diesel engine is critical in reducing the amount of
harmful tailpipe emissions. Efficient operation of these aftertreatment systems generally requires elevated temperatures of 250◦C or above. In this effort, a flexible valvetrain will be utilized to demonstrate fuel-efficient strategies via intake valve closure
(IVC) modulation at elevated speeds and loads. In addition, thermal management
strategies will be demonstrated at low-to-moderate loads via cylinder deactivation
(CDA), cylinder cutout, exhaust valve opening (EVO) modulation, and high-speed
idle operation.
At elevated engine speeds, late intake valve closure (LIVC) enables improved
cylinder filling via a dynamic charging effect. It is experimentally and analytically
demonstrated that LIVC at 2200 RPM and 7.6 bar to 12.7 bar BMEP can be used to
increase the volumetric efficiency and enable higher exhaust gas recirculation fractions
without penalizing the air-to-fuel ratio. As a result, efficiency improving injection advances are implemented to achieve 1.2% and 1.9% fuel savings without sacrificing NOx penalties. In order to implement the LIVC benefits on a cammed engine,
production-viable valve profile solutions were investigated. It is demonstrated that
lost-motion-enabled and/or added-motion-enabled boot shape profiles are capable of
improving volumetric efficiency at elevated engine speeds and loads. These profiles
were also considered for one (of two) -valve modulation and two-valve modulation.
Nearly 95% of the volumetric efficiency benefits are possible using production-viable
boot or phase profiles, while 80% of the benefits are possible for single-valve modulation.
At curb idle, CDA and cylinder cutout operation realize stay-warm aftertreatment
thermal management improvements by leveraging their impact on the gas exchange
process. Specifically, cylinder cutout demonstrates 17% fuel savings, while CDA
demonstrates 40% fuel savings, over the conventional six-cylinder thermal calibration. Additionally, the performance of cylinder cutout is subject to the geometry of
the exhaust manifold, location of the EGR loop, and ability to control the exhaust
manifold pressure.
Elevating the idle speed, while maintaining the same idle load, enables improved
aftertreatment warm-up performance with engine-out NOx and PM levels no higher
than a state-of-the-art thermal calibration at conventional idle operation. Elevated
idle speeds of 1000RPM and 1200 RPM, compared to conventional idle at 800 RPM,
realized 31% to 51% increase in exhaust flow and 25◦C to 40◦C increase in engine-out
temperature, respectively. Additional engine-out temperature benefits are experimentally demonstrated at all three idle speeds considered (800, 1000, and 1200 RPM),
without compromising the exhaust flow rates or emissions, by modulating the EVO
timing.
At low-to-moderate loads modern diesel engines manipulate exhaust manifold
pressures to drive EGR and thermally manage the aftertreatment. In these engines
exhaust manifold pressure control is typically achieved via either a valve after the turbine, a variable geometry turbine, or wastegating. It is experimentally demonstrated that valvetrain flexibility enables efficient engine and aftertreatment operation without requiring exhaust manifold pressure control. Specifically, IVC modulation and
CDA at elevated engine speeds, along with EVO modulation, CDA, and internal EGR
at low engine speeds can match, or improve, efficiency and thermal management performance compared to a stock thermal calibration that requires exhaust manifold
pressure control.
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Chou, Fang Hsing, and 周芳興. "The Feasibility Study of Idle Start in Single-cylinder Piston-type Air Hybrid Engines." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/95144304492918543579.
Full textAbstract:
碩士國立清華大學
動力機械工程學系
103
The study aims to investigate feasibility of a single cylinder piston-type compressed air engine assisting to an internal combustion engine for idle start. The engine will be started as compressed air engine mode at beginning and it will later switch to internal combustion mode once the engine speed reaches to higher rpm. In this study, a theoretical analysis using thermodynamics and compressed air model has been carried out with MATLAB to understand the engine performance as well as fluid characteristics. A commercial available 100 c.c. single cylinder four-stoke internal combustion engine is modified to a 100 c.c. four-stroke air-powered engine to test the torque and power output. The experimental results have been compared with the data from theoretical analysis. A four-stroke compressed air engine has been modified with the inlet valve to operate with high pressure compressed air before the experiments. A buffer tank is connected to the four-stroke air-engine operation through the spark plug hole due to high cylinder pressure resulted from the isentropic compression. Different buffer tank volumes have been examined during the experiment for the torque and power output. The buffer tank with volume of 1.5 litters and compressed air pressure of 5 bar is used for the subsequent tests of idle-start. A four-stroke engine with four valves is also examined theoretically to find the feasibility of idle-start which can select one or two valves to connect with buffer region instead of using the spark plug hole. An exchangeable cam mechanism which can switch the two-stroke mode operation to/from four-stroke mode has also been studied, this mechanism can be used to start the engine as two–stroke compressed air engine then switch to four-stroke internal combustion mode. It can also be used to switch the four-stroke internal combustion mode back to two-stroke mode for regenerative braking and recycling the compressed air.
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王源煒. "The Feasibility Study of Idle Start and Regenerative Braking Applications in Air Hybrid Engines." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/62489099183620501422.
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