Journal articles: 'Engine turbocharging'

1

Zhu, Dengting, Zhenzhong Sun, and Xinqian Zheng. "Turbocharging strategy among variable geometry turbine, two-stage turbine, and asymmetric two-scroll turbine for energy and emission in diesel engines." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, no. 7 (November 28, 2019): 900–914. http://dx.doi.org/10.1177/0957650919891355.

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Energy saving and emission reduction are very urgent for internal combustion engines. Turbocharging and exhaust gas recirculation technologies are very significant for emissions and fuel economy of internal combustion engines. Various after-treatment technologies in internal combustion engines have different requirements for exhaust gas recirculation rates. However, it is not clear how to choose turbocharging technologies for different exhaust gas recirculation requirements. This work has indicated the direction to the turbocharging strategy among the variable geometry, two-stage, and asymmetric twin-scroll turbocharging for different exhaust gas recirculation rates. In the paper, a test bench engine experiment was presented to validate the numerical models of the three diesel engines employed with the asymmetric twin-scroll turbine, two-stage turbine, and variable geometry turbine. On the basis of the numerical models, the turbocharging routes among the three turbocharging approaches under different requirements for EGR rates are studied, and the other significant performances of the three turbines were also discussed. The results show that there is an inflection point in the relative advantages of asymmetric, variable geometry, and two-stage turbocharged engines. At the full engine load, when the EGR rate is lower than 29%, the two-stage turbocharging technology has the best performances. However, when the exhaust gas recirculation rate is higher than 29%, the asymmetric twin-scroll turbocharging is the best choice and more appropriate for driving high exhaust gas recirculation rates. The work may offer guidelines to choose the most suitable turbocharging technology for engine engineers and manufacturers to achieve further improvements in engine energy and emissions.

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Dong, Da Lu, Chang Pu Zhao, Xiao Zhan Li, Yun Yao Zhu, and Jun Zhang. "Simulation Study of the Impact of Two-Stage Turbocharged System on Diesel Engine." Applied Mechanics and Materials 170-173 (May 2012): 3555–59. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.3555.

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With the increasing strictness of emission regulations, development direction of future diesel engines is toward the high thermal efficiency and low emissions. Supercharging technology is an important means for improving output power of diesel engines. This paper deals with the study of the two-stage turbocharging system of the non-road diesel engine. Based on GT-Power software code, a digital model of 6112 diesel engine was established. The supercharged model was calibrated by using the original experimental data. Then, four types of digital models with different two-stage turbocharging systems were constructed. The best two-stage turbocharging system was determined through investigating the impacts of different options on the performance of diesel engines. It was indicated through the study that two-stage turbocharging system can substantially increase the air flowing into the cylinder which increases the potential of power density. At the same time HC and NOx emissions can reduce. Through this study, a theoretical basis and an important reference for adopting the two-stage turbocharging system of the 6112 diesel engine were provided.

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Zhao, Fu Zhou, Xiu Min Wang, and Kun Zi. "Vehicle Hybrid Turbocharging System and its Analysis of Energy Flow in Key Condition." Applied Mechanics and Materials 71-78 (July 2011): 2327–30. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.2327.

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By comparing the characteristics of various turbocharging system, then hybird turbocharging system is proposed. In principle the technical approach of hybrid turbocharging system is analyzed to solve the steady and transient condition problem about vehicle diesel engine. Then several modes of energy flow about hybrid turbocharging system are analyzed, and calculation processes about each share of the energy flow are given. According to the characteristic of turbocharged diesel engine, the energy flow distribution of the two typical engine conditons is calculated. Analysis of energy flow is of great significance to properly distribute the energy share and improve the performance of the turbocharging system.

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DANILECKI, Krzysztof. "Trends in the development of turbocharging systems in automotive vehicles." Combustion Engines 133, no. 2 (May 1, 2008): 61–76. http://dx.doi.org/10.19206/ce-117248.

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The application of turbocharging systems results in serious problems related to the delivery of appropriate amount of air needed to entirely burn the supplied dose of fuel. This problem is particularly relevant for non-adjustable turbocharging systems (constant geometry turbines). The improvements of the turbocharging systems in compression ignition engines may be implemented through such solutions as two stage or sequential turbocharging that show significant benefits as opposed to a single stage variable turbocharger geometry (VGT) turbocharging. The paper presents adjustable two stage turbocharging and sequential turbocharging finding application in serially manufactured vehicles. The assessment of the properties of these solutions and attempts to describe the trends in the further development of the turbocharging systems have been made. With this background, the results of own research of the author have been presented performed on a SW 680 sequentially turbocharged engine.

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Cui, Yi, Hongzhong Gu, Kangyao Deng, and Shiyou Yang. "Study on Mixed Pulse Converter (MIXPC) Turbocharging System and Its Application in Marine Diesel Engines." Journal of Ship Research 54, no. 01 (March 1, 2010): 68–77. http://dx.doi.org/10.5957/jsr.2010.54.1.68.

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In order to improve fuel efficiency and power density, the boost pressure of diesel engine is increasing continuously. The increase in boost level leads to some problems, such as lack of air under part load operating conditions, response delay during transient processes, and high mechanical and thermal load. In order to meet the high boost level demand, a new type of turbocharging system—mixed pulse converter (MIXPC) turbo-charging system for multicylinder diesel engines (from 4 to 20 cylinders) has been invented. A turbocharged diesel engine simulation model, based on one-dimensional finite volume method (FVM) and total variation diminishing (TVD) scheme, has been developed and used to design and analyze the MIXPC turbocharging system. The applications of MIXPC system in in-line 8- and 4-cylinder and V-type 16-cylinder medium-speed marine diesel engines have been studied by calculation and experiments. The results show that the invented MIXPC system has superior engine fuel efficiency and thermal load compared with original turbocharging systems.

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Benvenuto, G., and U. Campora. "Dynamic simulation of a high-performance sequentially turbocharged marine diesel engine." International Journal of Engine Research 3, no. 3 (June 1, 2002): 115–25. http://dx.doi.org/10.1243/14680870260189244.

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The sequential turbocharging technique is used to improve the performance of highly rated diese engines in particular at part loads. However, the transient behaviour of the sequential turbocharging connection/disconnection phases may be difficult to calibrate and requires an accurate study and development. This may be accomplished, in addition to the necessary experimentation, by means of dynamic simulation techniques. In this paper a model for the dynamic simulation of a sequentially turbocharged diesel engine is presented. A two-zone, non-adiabatic, actual cycle approach is used for the chemical and thermodynamic phenomena simulation in the cylinder. Fluid mass and energy accumulation in the engine volumes are evaluated by means of a filling and emptying method. The simulation of the turbocharger dynamics combines the use of the compressor and turbine maps with a model of the sequential turbocharging connection/disconnection valves and of their governor system. The procedure is applied to the simulation of the Wärtsilä 18V 26X engine, a highly rated, recently developed, sequentially turbocharged marine diesel engine, whose experimental results are used for the steady state and transient validation of the simulation code with particular reference to the sequential turbocharging connection/disconnection phases. The presented results show the time histories of some important variables during typical engine load variations.

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Swain, Ed. "Turbocharging the submarine diesel engine." Mechatronics 4, no. 4 (June 1994): 349–67. http://dx.doi.org/10.1016/0957-4158(94)90017-5.

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Zhang, Peng-qi, Li-jun Zong, and Yin-yan Wang. "Turbocharging the DA465 gasoline engine." Journal of Marine Science and Application 7, no. 2 (May 30, 2008): 111–15. http://dx.doi.org/10.1007/s11804-008-7026-8.

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9

Zhao, Fu Zhou, Rong Liang, and Xiao Ping Chen. "Study on Steady Condition Control of Hybrid Turbocharging System." Advanced Materials Research 139-141 (October 2010): 1941–44. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.1941.

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This paper analyzes the principle of hybrid turbocharging system in a vehicle diesel engine, and proposes motor control model about hybrid turbocharging system in steady engine operation condition according to energy imbalance of the exhaust gas. The high-speed motor can work as a motor or a generator in this control model of different engine condition. Then mapping algorithms about n-dimensional linear interpolation and BP neural network are presented to solve steady condition control problem of the hybrid turbocharging system. Each algorithm is applied to map same sample data, the simulation results reveal that BP neural network mapping algorithm is more suitable for the mapping control of hybrid turbocharging system because BP neural network has better generalization ability and faster processing speed.

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Panting, J., K. R. Pullen, and R. F. Martinez-Botas. "Turbocharger motor-generator for improvement of transient performance in an internal combustion engine." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 215, no. 3 (March 1, 2001): 369–83. http://dx.doi.org/10.1243/0954407011525700.

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Turbocharging of internal combustion engines is an established technology used for the purpose of increasing both power density and in some cases the cycle efficiency of diesel engines relative to naturally aspirated engines. However, one significant drawback is the inability to match the characteristics of the turbocharger to the engine under full load and also to provide sufficiently good transient response. Under many conditions this results in reduced efficiency and leads to higher exhaust emissions. The design of turbocharger components must be compromised in order to minimize these drawbacks throughout the entire operating range. However, when shaft power can be either added to or subtracted from the turbocharger shaft by means of a direct drive motor-generator, an additional degree of freedom is available to the designer to achieve a better turbocharger-engine matching. Both engine efficiency and transient response can be significantly improved by means of this method, normally described as hybrid turbocharging. This paper describes the results of a theoretical study of the benefits of hybrid turbocharging over a basic turbocharged engine in both steady state and transient operation. The new system and its benefits are described and four different engine-turbocharger systems are analysed in addition to the baseline engine. The main conclusion of the paper is that a significant increase in design point cycle efficiency can be afforded by re-matching the turbocharger components under steady state conditions while at the same time improving full throttle transient performance. Emissions are not considered in this paper.

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11

Kadirova, Seher, Stiliyan Okishelov, and Zhivko Kolev. "Electronic system for control of temperature of exhaust gases and pressure in turbochargers of diesel automobile engines." E3S Web of Conferences 286 (2021): 04011. http://dx.doi.org/10.1051/e3sconf/202128604011.

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The paper presents design and experimental investigation of an electronic system for control of the temperature of exhaust gases and the turbocharging air pressure in turbochargers of diesel automobile engines. The existing problems are faults in the fuel system of an engine. The indicators are changes in the values of the temperature and pressure in exact areas of the turbocharger. The presented device is a controller that monitors precisely the temperature and pressure, which are so vital for the long operation of the automobile. The control system is based on Arduino microcontroller. OLED Display has been added to visualize the obtained results. A schematic diagram of an electronic module for control of the temperature of exhaust gases and turbocharging air pressure in turbochargers of diesel automobile engines has been synthesized. The system has been investigated in laboratory conditions and practically implemented in a real automobile. As a result of laboratory experimental investigation, results were obtained for the time-monitored parameters temperature of the exhaust gases and turbocharging air pressure in the turbocharger system of a diesel automobile engine.

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12

Meier, E., and J. Czerwinski. "Turbocharging Systems With Control Intervention for Medium Speed Four-Stroke Diesel Engines." Journal of Engineering for Gas Turbines and Power 111, no. 3 (July 1, 1989): 560–69. http://dx.doi.org/10.1115/1.3240291.

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The turbocharging systems of highly boosted four-stroke diesel engines (BMEP 25 bar/363 psi) have to cope with two basic problems: lack of air and compressor surge at reduced engine speed. In the case of medium speed engines for ship propulsion and stationary applications, the following three control interventions have proved to be successful solutions: (1) waste gating air or exhaust gas at full load and speed, (2) using a compounded or independent exhaust gas driven power turbine that can be shut off at part load and speed, and (3) blowing air from the compressor outlet to the turbine inlet through a controlled bypass. The effect of these control interventions on engine performance is shown by examples and analyzed by means of characteristic quantities for the efficiency of the turbocharging system and the engine. The definitions and meanings of these quantities are explained in the first part of the paper.

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13

Kozak, Dariusz, and Paweł Mazuro. "Transient Simulation of the Six-Inlet, Two-Stage Radial Turbine under Pulse-Flow Conditions." Energies 14, no. 8 (April 7, 2021): 2043. http://dx.doi.org/10.3390/en14082043.

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In recent years, the automotive sector has been focused on emission reductions using hybrid and electric vehicles. This was mainly caused by political trends promoting “green energy”. However, that does not mean that internal combustion engines (ICEs) should be forgotten. The ICE has still the potential of recovering energy from exhaust gases. One of the promising ways to recover energy is turbocharging. Over the years engine manufacturers have designed very efficient turbocharger systems which have greatly increased the overall engine efficiency. This led to pollutant emission reductions. This paper presents the results of the three-dimensional (3-D) numerical simulations of the two-stage, six-inlet turbocharging system under the influence of unsteady, pulsed-flow conditions. The calculations were carried out for three turbine speeds. The most interesting results of this study were the separation of exhaust gases coming from the six-exhaust pipes and the performance of both stages under pulse-flow conditions. The two-stage turbocharging system was compared against the single-stage turbocharging system and the results showed that the newly designed two-stage turbine system properly separated the exhaust gases of the adjacent exhaust pipes.

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14

Sims, R. E. H., W. R. Ritchie, and A. J. Chadwick. "Turbocharging of an agricultural tractor engine." Journal of Agricultural Engineering Research 47 (September 1990): 177–86. http://dx.doi.org/10.1016/0021-8634(90)80039-w.

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15

Boretti, Albert. "Super Turbocharging the Direct Injection Diesel engine." Nonlinear Engineering 7, no. 1 (March 26, 2018): 17–27. http://dx.doi.org/10.1515/nleng-2017-0067.

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Abstract The steady operation of a turbocharged diesel direct injection (TDI) engine featuring a variable speed ratio mechanism linking the turbocharger shaft to the crankshaft is modelled in the present study. Key parameters of the variable speed ratio mechanism are range of speed ratios, efficiency and inertia, in addition to the ability to control relative speed and flow of power. The device receives energy from, or delivers energy to, the crankshaft or the turbocharger. In addition to the pistons of the internal combustion engine (ICE), also the turbocharger thus contributes to the total mechanical power output of the engine. The energy supply from the crankshaft is mostly needed during sharp accelerations to avoid turbo-lag, and to boost torque at low speeds. At low speeds, the maximum torque is drastically improved, radically expanding the load range. Additionally, moving closer to the points of operation of a balanced turbocharger, it is also possible to improve both the efficiency η, defined as the ratio of the piston crankshaft power to the fuel flow power, and the total efficiency η*, defined as the ratio of piston crankshaft power augmented of the power from the turbocharger shaft to the fuel flow power, even if of a minimal extent. The energy supply to the crankshaft is possible mostly at high speeds and high loads, where otherwise the turbine could have been waste gated, and during decelerations. The use of the energy at the turbine otherwise waste gated translates in improvements of the total fuel conversion efficiency η* more than the efficiency η. Much smaller improvements are obtained for the maximum torque, yet again moving closer to the points of operation of a balanced turbocharger. Adopting a much larger turbocharger (target displacement x speed 30% larger than a conventional turbocharger), better torque outputs and fuel conversion efficiencies η* and η are possible at every speed vs. the engine with a smaller, balanced turbocharger. This result motivates further studies of the mechanism that may considerably benefit traditional powertrains based on diesel engines.

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Arif, Saba, Adil Qadeer, Juntakan Taweekun, Zamri Noranai, and Roman Kalvin. "Effect of Refrigeration Assisted Intercooler Turbocharging on Engine’s Horse Power." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 79, no. 2 (January 15, 2021): 95–111. http://dx.doi.org/10.37934/arfmts.79.2.95111.

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The stringent regulations on fuel saving and emissions reduction in the transportation sector have become game-raisers in the development of present internal combustion engines for road applications, even if under-the-hood space constraints, downsizing and down-weighting prevent from adopting radical changes in the engine layout. In current research, objective is to find a viable and pragmatic solution to reduce the turbo-charged engine intake air temperature by a large value as compared to traditional air-to-air intercoolers to increase Engine Horsepower. In undergoing research, a refrigerated intercooler is designed on the basis of refrigeration cycle, which further decreases the intake air temperature of the engine, resulting in increased horsepower, and improved Formula 1 lap times. Additionally, Formula 1, 2014 (V6 Turbo-Charged) Engine is used. According to the results, horse power of 1209.74HP is obtained by using refrigeration assisted intercooler. However, 1061HP is obtained for air to air intercooler. So, performance gain of 15 to 20% over present intake air cooling system in Formula 1 engine cars is successfully achieved. Additionally, Research will be utilized to decrease lap time in formula 1 racing cars.

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Tauzia, X., J. F. Hetet, P. Chesse, G. Crosshans, and L. Mouillard. "Computer aided study of the transient performances of a highly rated sequentially turbocharged marine diesel engine." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 212, no. 3 (May 1, 1998): 185–96. http://dx.doi.org/10.1243/0957650981536853.

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The sequential turbocharging technique described in this paper leads to an improvement in the operations of highly rated diesel engines, in particular at part loads (better air admission). However, transient phases such as a switch from one turbocharger to two turbochargers can be difficult, mainly because of the inertia of the turbochargers. In order to simulate the dynamics of turbocharged diesel engines, the SELENDIA software has been extended. When applied to two different engines (12 and 16 cylinders), the program shows good agreement with the experimental data. Moreover, the compressor surge has been investigated during faulty switch processes. The software has then been used for predictive studies to evaluate the possibility of adapting sequential turbocharging to a 20-cylinder engine and to calibrate the optimum switching conditions (air and gas valve opening timing).

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Kumar, K. M., P. Venkateswaran, and P. Suresh. "Effective Fuel Consumption by Improving Cooling Water Flow Rate in IC Engine." Applied Mechanics and Materials 812 (November 2015): 112–17. http://dx.doi.org/10.4028/www.scientific.net/amm.812.112.

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The coolant (water) pump assumes an important role of cooling system in IC engines. With upgrading of the engine power by turbocharging and turbo inter cooling, the water pump capacity needs to be increased corresponding to the power. This capacity enhancement has to be achieved without calling for a major change in the existing water pump, envelop and related fitment details. This requires a clear understanding of centrifugal pump for its performance parameter. One such engine is upgraded by turbocharging from 195PS to 240PS @2200 rpm. Improving water pump flow by changing the impeller dimensions, impeller casing, increase the suction, delivery pipe diameter had been done. Validation of the water pump in its actual engine installation was taken up as a part of the research work. Flow rate comparison of the new pump with the existing pump was made and the results were analyzed. The new water pump gives better flow rates for the engine speeds up to1800 rpm, beyond which the flow rate is slightly lesser than the existing pump.

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KARPIŃSKI, Paweł, Konrad PIETRYKOWSKI, and Łukasz GRABOWSKI. "Turbocharging the aircraft two-stroke diesel engine." Combustion Engines 178, no. 3 (July 1, 2019): 112–16. http://dx.doi.org/10.19206/ce-2019-319.

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The power and efficiency of a two-stroke engine strongly depends on the efficiency of the scavenging process which consists in re-moving the rest of the exhaust gases from the cylinder and filling it with a fresh charge. The quality of the charge exchange process is significantly influenced by the construction of the intake system. The paper presents a zero-dimensional model of the aircraft two-stroke opposed-piston diesel engine with two variants of the intake system: with a mechanical compressor and a turbocharger connected in series with a mechanical compressor. Simulation studies of the developed cases were carried out in the AVL BOOST software. For the defined engine operating points, its performance was compared for different designs of the intake system. It was confirmed that the use of a turbocharger with a mechanical compressor extends the range of operating at high altitudes.

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Sun, Qi Xin, and Limin Chen. "Research on Transmitting Efficiency of Supercharged Device." Applied Mechanics and Materials 63-64 (June 2011): 237–40. http://dx.doi.org/10.4028/www.scientific.net/amm.63-64.237.

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In recent years, the internal combustion engine has been widely used through technological advances to improve its environmental performance. Mechanical and electrical integration of the engine turbocharging system is based on conventional turbocharging system to increase motor in parallel with the turbocharger and the corresponding reversible energy storage components, so that achieve by adjusting the energy input or output direction and the size of the motor to adjust the exhaust turbocharger operating point and the gas supply function. According to matching requirements of light vehicle diesel engine, the analysis model of exhaust gas energy is obtained through qualitative analysis of exhaust gas energy in turbocharged diesel engine.

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Hu, Zhilong, Kangyao Deng, Yi Cui, Xinxin Yang, and Baochuan Zhang. "Steady-state and transient control strategies for a two-stage turbocharged diesel engine." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 232, no. 9 (October 6, 2017): 1167–79. http://dx.doi.org/10.1177/0954407017727442.

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Two-stage turbocharging technology is widely used to achieve higher engine power density and lower exhaust emissions. To solve a series of contradictions in matching, a regulated two-stage (RTS) turbocharging system is applied to reasonably control boost pressure. This paper investigated steady-state and transient control strategies for an RTS turbocharging system to achieve optimum fuel economy in steady-state conditions and better performance in transient conditions. The economic control strategies for steady-state operational conditions were based on an economic regulation law, which was established by a steady-state test of an engine with an RTS turbocharging system under all operating conditions. To optimize the transient performance, open-loop and closed-loop control systems (the latter with dynamic judgement) for the RTS system were designed and validated with experiments on a heavy-duty diesel engine. The experimental results demonstrated that the open-loop control strategy and the closed-loop strategy with dynamic judgement could improve the transient response performance. The optimum transient response performance was achieved by the closed-loop control system with dynamic judgement. Additionally, the combination of steady-state and transient control strategies could achieve the best fuel economy in steady-state conditions and good transient response performances.

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DZIUBAK, Tadeusz, and Mirosław KARCZEWSKI. "Operational malfunctions of turbochargers – reasons and consequences." Combustion Engines 164, no. 1 (February 1, 2016): 13–21. http://dx.doi.org/10.19206/ce-116484.

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The paper discusses the most frequently occurring types of damage in turbochargers fitted in modern combustion engines and their influence on the engine basic operational indexes. The following causes of turbocharger malfunctions have been discussed: no lubrication, low lubricant pressure, reduced lubricant quality, foreign objects in the charged air and in the exhaust gas. Example malfunctions resulting from the said causes have been shown. The experimental part discusses the influence of a reduction of the charging pressure resulting from a leakage in the intake system on the effective parameters of a diesel engine fitted in light-duty and heavy-duty vehicles. The leakage in the intake system has been simulated by boring holes of the diameter of 3 and 12 mm in the intake manifold downstream of the turbocharger. The influence has been determined of the leakage of the turbocharging system on the value of the charging pressure, maximum effective power, engine torque, unit and hourly fuel consumption and the concentration of the exhaust components. A significant impact has been observed of the leakage of the turbocharging system on the effective parameters of the tested diesel engine and exhaust gas composition.

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Altosole, Marco, Flavio Balsamo, Ugo Campora, and Luigia Mocerino. "Marine Dual-Fuel Engines Power Smart Management by Hybrid Turbocharging Systems." Journal of Marine Science and Engineering 9, no. 6 (June 15, 2021): 663. http://dx.doi.org/10.3390/jmse9060663.

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The performance of a marine dual-fuel engine, equipped with an innovative hybrid turbocharger producing electric power to satisfy part of the ship’s electric load, is presented by a simulation comparison with the traditional turbocharging technology. The two distinct fuel types, combined with the hybrid turbocharger, involve a substantial change in the engine control modes, resulting in more flexible and efficient power management. Therefore, the investigation requires a numerical analysis depending on the engine load variation, in both fuelling modes, to highlight different behaviours. In detail, a dual-fuel engine simulation model is validated for a particular application in order to perform a complete comparison, reported in tabular and graphical form, between the two examined turbocharging solutions. The simulation analysis is presented in terms of the engine working data and overall energy conversion efficiency.

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Li, Hualei, Lei Shi, and Kangyao Deng. "Research on the Power Recovery of Diesel Engines with Regulated Two-Stage Turbocharging System at Different Altitudes." International Journal of Rotating Machinery 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/209084.

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Recovering the boost pressure is very important in improving the dynamic performance of diesel engines at high altitudes. A regulated two-stage turbocharging system is an adequate solution for power recovery of diesel engines. In the present study, the change of boost pressure and engine power at different altitudes was investigated, and a regulated two-stage turbocharging system was constructed with an original turbocharger and a matched low pressure turbocharger. The valve control strategies for boost pressure recovery, which formed the basis of the power recovery method, are presented here. The simulation results showed that this system was effective in recovering the boost pressure at different speeds and various altitudes. The turbine bypass valve and compressor bypass valve had different modes to adapt to changes in operating conditions. The boost pressure recovery could not ensure power recovery over the entire operating range of the diesel engine, because of variation in overall turbocharger efficiency. The fuel-injection compensation method along with the valve control strategies for boost pressure recovery was able to reach the power recovery target.

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Usai, Vittorio, and Silvia Marelli. "Steady State Experimental Characterization of a Twin Entry Turbine under Different Admission Conditions." Energies 14, no. 8 (April 16, 2021): 2228. http://dx.doi.org/10.3390/en14082228.

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The increasingly restrictive limits on exhaust emissions of automotive internal combustion engines imposed in recent years are pushing OEMs to seek new solutions to improve powertrain efficiency. Despite the increase in electric and hybrid powertrains, the turbocharging technique is still one of the most adopted solution in automotive internal combustion engines to achieve good efficiency with high specific power levels. Nowadays, turbocharged downsized engines are the most common solution to lower CO2 emissions. Pulse turbocharging is the most common boosting layout in automotive applications as the best response in terms of time-to-boost and exhaust energy extraction. In a high-fractionated engine with four or more cylinders, a twin entry turbine can be adopted to maximize pulse turbocharging benefits and avoid interaction in the discharge phase of the cylinders. The disadvantages of the twin entry turbine are mainly due to the complexity of the exhaust piping line and the high amount of information required to build a rigorous and reliable matching model. This paper presents a detailed experimental characterization of a twin entry turbine with particular reference to the turbine efficiency and the swallowing capacity under different admission conditions. The steady flow experimental campaign was performed at the turbocharger test bench of the University of Genoa, in order to analyze the behavior of the twin entry turbine in full, partial and unbalanced admission. These are the conditions in which the turbine must work instantaneously during its normal operation in engine application. The results show a different swallowing capacity of each sector and the interactions between the two entries.

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Yang, Chuan Lei, Jin Zhu Liu, Can Cao, and Jin Xin Wang. "Development of Automatic Examination Instrument for Diesel Engine Sequential Turbocharging Control System." Applied Mechanics and Materials 339 (July 2013): 137–42. http://dx.doi.org/10.4028/www.scientific.net/amm.339.137.

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ATmega128 single-chip microcomputer was regarded as control core, the diesel engine speed and pressure signal simulation hardware circuit were designed based on digital to analog converter TLC5618, clock chip DS12C887 and analog signal processing unit SY4-20mA-P. According to the equipment evaluation process, the sequential turbocharging control instrument automatic assessment program was compiled in the reference of real-time. The sequential turbocharging control instrument factory automatic evaluation function was realized which improve the production efficiency.

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Доценко, D. Dotsenko, Сторчеус, and Yu Storcheus. "IMPROVING THE RELIABILITY OF THE SUPERCHARGING SYSTEM WITH ENERGY TRANSFORMERS FOR TRANSPORT DIESELS." Alternative energy sources in the transport-technological complex: problems and prospects of rational use of 2, no. 2 (December 17, 2015): 430–35. http://dx.doi.org/10.12737/19304.

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The article presents the results of computational and experimental studies of the effect of operating and design parameters of the system on the basis of the boost transformer cascade energy performance and reliability characteristics of diesel vehicles. The factors affecting the performance of the combined engine turbocharging. Ways of expanding the area of effective operation of the systems considered turbocharging

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Nakonieczny, K. "Entropy generation in a diesel engine turbocharging system." Energy 27, no. 11 (November 2002): 1027–56. http://dx.doi.org/10.1016/s0360-5442(02)00082-8.

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Tian, Wei, Defeng Du, Juntong Li, Zhiqiang Han, and Wenbin Yu. "Establishment of a Two-Stage Turbocharging System Model and Analysis on Influence Rules of Key Parameters." Energies 13, no. 8 (April 15, 2020): 1953. http://dx.doi.org/10.3390/en13081953.

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This paper took a two-stage turbocharged heavy-duty six-cylinder diesel engine as the research object and established a two-stage turbocharging system matching model. The influence rules between the two-stage turbocharging key parameters were analyzed, while summarizing an optimization method of key parameters of a two-stage turbocharger. The constraint equations for the optimal distribution principle of the two-stage turbocharger’s pressure ratio and expansion ratio were proposed. The results show that when the pressure ratio constraint equation and expansion ratio constraint equation are satisfied, the diesel engine can achieve the target pressure ratio, while the total energy consumption of the turbocharger is the lowest.

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Hunter, C. E., H. A. Cikanek, and T. P. Gardner. "Evaluation of Some Factors Controlling DI Diesel Combustion and Exhaust Emissions." Journal of Engineering for Gas Turbines and Power 111, no. 3 (July 1, 1989): 379–86. http://dx.doi.org/10.1115/1.3240265.

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The combined effects of turbocharging, high fuel injection pressure, and reduced oil consumption on diesel exhaust emissions were investigated using a single-cylinder research engine. The influence of these exhaust emission control concepts on particulate composition was determined using a new particulate analysis method. In addition, the dependence of particulate composition on engine load and air utilization was examined using the microfumigation technique. Simultaneous application of these emissions control concepts reduced exhaust particulates by 70 percent. High injection pressure reduced the insoluble component of particulates, while reducing oil consumption and turbocharging the engine lowered both soluble and insoluble particulates. Reductions in oil-derived particulates with increasing engine load were partially attributed to increases in volumetric air utilization. Ninety percent of the lube oil found in exhaust particulates was unburned; however, similar concentrations of unburned and partially oxidized components were observed in fuel-derived particulates.

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Le, Tuan Anh. "SIMULATION OF A TURBOCHARGING SYSTEM EQUIPPED FOR A DIESEL ENGINE D1146TIS." Science and Technology Development Journal 12, no. 14 (August 15, 2009): 86–94. http://dx.doi.org/10.32508/stdj.v12i14.2343.

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The paper presents simulated results of a turbocharging system in a combination of turbine - compressor - IC. engine on one dimensional simulation software AVL-BOOST. Findings of the research depict clearly that the turbocharger equipped for the engine has met all requirements to have high boost pressure for this engine. The full load curve of the engine is located out of the surge area and in the area of high efficiency of the compressor's map. Besides, findings of the research also virtually show the matching of the turbochager and the engine - an important basis for operating the turbocharged engine with highest efficiency. It is a part of the collaborative research activities on developing a new type of high tuborcharged IC. diesel engine between Hanoi University of Technology (HUT) and Vietnam Engine and Agricultural Machinary Corporation (VEAM).

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Boretti, Alberto. "Numerical Analysis of High-Pressure Direct Injection Dual-Fuel Diesel-Liquefied Natural Gas (LNG) Engines." Processes 8, no. 3 (February 25, 2020): 261. http://dx.doi.org/10.3390/pr8030261.

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Dual fuel engines using diesel and fuels that are gaseous at normal conditions are receiving increasing attention. They permit to achieve the same (or better) than diesel power density and efficiency, steady-state, and substantially similar transient performances. They also permit to deliver better than diesel engine-out emissions for CO2, as well as particulate matter, unburned hydrocarbons, and nitrous oxides. The adoption of injection in the liquid phase permits to further improve the power density as well as the fuel conversion efficiency. Here, a model is developed to study a high-pressure, 1600 bar, liquid phase injector for liquefied natural gas (LNG) in a high compression ratio, high boost engine. The engine features two direct injectors per cylinder, one for the diesel and one for the LNG. The engine also uses mechanically assisted turbocharging (super-turbocharging) to improve the steady-state and transient performances of the engine, decoupling the power supply at the turbine from the power demand at the compressor. Results of steady-state simulations show the ability of the engine to deliver top fuel conversion efficiency, above 48%, and high efficiencies, above 40% over the most part of the engine load and speed range. The novelty of this work is the opportunity to use very high pressure (1600 bar) LNG injection in a dual fuel diesel-LNG engine. It is shown that this high pressure permits to increase the flow rate per unit area; thus, permitting smaller and lighter injectors, of faster actuation, for enhanced injector-shaping capabilities. Without fully exploring the many opportunities to shape the heat release rate curve, simulations suggest two-point improvements in fuel conversion efficiency by increasing the injection pressure.

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Burak, Piotr. "Model algorithmization for turbo cooling air processing on the example of a turbocharged engine with self-ignition engine." AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 19, no. 9 (September 30, 2018): 112–16. http://dx.doi.org/10.24136/atest.2018.296.

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The article discusses the simplified mathematical model of the turbo cooling system and the algorithm based on the iterative calculation mechanism. The basic mathematical relations concerning the work of the turbocharger describing the essence of the processes occurring in turbocharging and the possibility of applying these connections in the research model including the phenomenon of turbo cooling were presented.

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Klausner, Johann, Jürgen Lang, and Christian Trapp. "J624 – World’s first Gas Engine with Two-Stage Turbocharging." MTZ worldwide 72, no. 4 (March 11, 2011): 30–35. http://dx.doi.org/10.1365/s38313-011-0038-9.

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MITIANIEC, Władyslaw, and Konrad BUCZEK. "Modification of four-stroke engine for operation in two-stroke cycle for automotive application." Combustion Engines 162, no. 3 (August 1, 2015): 3–12. http://dx.doi.org/10.19206/ce-116860.

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The main disadvantages of two-stroke engines such a big fuel consumption and big emission of hydrocarbons or carbon monoxide can be reduced by new proposal of design of two stroke engine based on four stroke engines. The paper describes the operation of high supercharged spark ignition overhead poppet valve two-stroke engine, which enables to achieve higher total efficiency and exhaust gas emission comparable to four-stroke engines. The work of such engines is possible by proper choice of valve timings, geometrical parameters of inlet and outlet ducts and charge pressure. The engine has to be equipped with direct fuel injection system enabling lower emission of pollutants. The work is based on theoretical considerations and engine parameters are determined on the simulation process by use GT-Power program and CFD program for different engine configurations. The initial results included in the paper show influence of valve timing on engine work parameters and predicted exhaust gas emission. The simulation results show that the nitrogen oxides are considerably reduced in comparison to four-stroke engines because of higher internal exhaust gas recirculation. The innovation of this proposal is applying of variable valve timing with turbocharging system in the two-stroke engine and obtaining a significant downsizing effect. The conclusions shows the possibilities of applying two-stroke poppet valve engine as a power unit for transportation means with higher total efficiency than traditional engines with possible change of engine operation in two modes: two- and four stroke cycles. The main disadvantages of two-stroke engines such a big fuel consumption and big emission of hydrocarbons or carbon monoxide can be reduced by new proposal of design of two stroke engine based on four stroke engines. The paper describes the operation of high supercharged spark ignition overhead poppet valve two-stroke engine, which enables to achieve higher total efficiency and exhaust gas emission comparable to four-stroke engines. The work of such engines is possible by proper choice of valve timings, geometrical parameters of inlet and outlet ducts and charge pressure. The engine has to be equipped with direct fuel injection system enabling lower emission of pollutants. The work is based on theoretical considerations and engine parameters are determined on the simulation process by use GT-Power program and CFD program for different engine configurations. The initial results included in the paper show influence of valve timing on engine work parameters and predicted exhaust gas emission. The simulation results show that the nitrogen oxides are considerably reduced in comparison to four-stroke engines because of higher internal exhaust gas recirculation. The innovation of this proposal is applying of variable valve timing with turbocharging system in the two-stroke engine and obtaining a significant downsizing effect. The conclusions shows the possibilities of applying two-stroke poppet valve engine as a power unit for transportation means with higher total efficiency than traditional engines with possible change of engine operation in two modes: two- and four stroke cycles.

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Qian, Yuehua, Zhe Zhang, and Kangyao Deng. "Development of a Three-Phase Sequential Turbocharging System with Two Unequal-Size Turbochargers." International Journal of Rotating Machinery 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/951096.

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A three-phase sequential turbocharging system with two unequal-size turbochargers is developed to improve the fuel economy performance and reduce the smoke emission of the automotive diesel engine, and it has wider range of application than the current two-phase sequential turbocharging system. The steady matching method of the turbochargers and engine and the steady switching boundary are presented. The experimental results show that this system is effective to improve the engine performance especially at the low speed and high load. The maximum reductions of BSFC and smoke opacity are 7.1% and 70.9%. The optimized switching strategies of the valves are investigated, and the surge of the compressor in the switching process is avoided. The switching strategies in the accelerating process are optimized, and the acceleration time from 900 r/min and 2100 r/min at constant torque is reduced by approximately 20%.

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Prasad, N. S., N. Ganesh, and A. Kumarasamy. "Technologies for High Power Density Diesel Engines." Defence Science Journal 67, no. 4 (June 30, 2017): 370. http://dx.doi.org/10.14429/dsj.67.11537.

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<p class="p1">The engines used in armoured fighting vehicles have to be compact, light in weight, efficient and reliable. In order to achieve a compact engine design, a complete understanding of all the factors affecting the engine performance is needed. However, it is important to note that the performance of the engine cannot be compromised in the pursuit of compactness. The aim of this paper is to classify systematically various broad areas affecting the engine’s power to weight and power to volume ratio and discuss respective current technologies available. This paper explores the possibility of size and weight reduction and efficiency enhancement of diesel engines by the use of various methods like engine friction reduction, better thermal management, high injection pressure, and turbocharging. Achieving high engine speeds and high BMEP will be the means of achieving high power density. The effects of engine configuration and technologies on compactness are also discussed. Finally, the configuration of a new engine and its design aspects, incorporating all the aforementioned concepts is discussed</p>

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Özgür, Tayfun, and Kadir Aydın. "Analysis of Engine Performance Parameters of Electrically Assisted Turbocharged Diesel Engine." Applied Mechanics and Materials 799-800 (October 2015): 861–64. http://dx.doi.org/10.4028/www.scientific.net/amm.799-800.861.

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Charging system is used to increase the charge density. Supercharging system suffers from fuel consumption penalty because of compressor powered by engine output. Turbocharging system uses wasted exhaust energy that means compressor powered by exhaust turbine but has a turbo lag problem. The electrically assisted turbocharger which can eliminate turbo lag problem and fuel consumption penalty is the topic of this paper. The purpose of this paper is to analyze the effect of electrically assisted turbocharger on diesel engine performance parameters. The AVL Boost software program was used to simulate the electrically assisted turbocharged diesel engine. Simulations results showed that electrically assisted turbocharger increases low end torque and improves fuel economy.

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Cui, Xin Jie, Shi Dong Zhang, Fan Shi, and Chuan Lei Yang. "Simulation on Performance of Sequential Turbocharging Diesel Engine with Inlet and Exhaust Bypass System." Applied Mechanics and Materials 490-491 (January 2014): 464–67. http://dx.doi.org/10.4028/www.scientific.net/amm.490-491.464.

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Sequential turbocharging and inlet/exhaust bypass (STC-CAB) were composited to used on diesel engine, which can expand engine running area in part load and optimize the matching of turbocharger and diesel engine. The simulation was studied based on GT-POWER software in order to investigate the engine performance difference caused by stc-cab system. The simulation results showed that STC-CAB system can make the compressor away from surge area and expand diesel engine running area, improve the performance of torque in low load.

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Clenci, A. C., G. Descombes, P. Podevin, and V. Hara. "Some aspects concerning the combination of downsizing with turbocharging, variable compression ratio, and variable intake valve lift." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 221, no. 10 (October 1, 2007): 1287–94. http://dx.doi.org/10.1243/09544070jauto449.

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The inefficient running of the spark ignition engine at part loads due to the load control method but, mostly, their major weighting in the vehicle's operation time justifies the interest in the technical solutions, which act in this particular operating range. These drawbacks encountered at low part loads are even more amplified when considering larger engines. For instance, it is well known that, at the same engine load, a larger engine is more throttled than a smaller engine; therefore the concerns are the higher pumping work, the lower real compression ratio, and the overall mechanical efficiency, which is also lower. One solution is a reduction in the displacement without affecting the power output. This is what is now commonly known as the downsizing technique. The combination of downsizing and uploading an engine has been known for a long time. However, the conversion, in an acceptable way, of this potential to actual practice is very challenging. On the one hand, the degree of the downsizing is related to the boost pressure. In order to cope with the knocking phenomenon, the downsized high-pressure turbocharged gasoline engine requires a lower volumetric compression ratio that limits the efficiency on part loads. Therefore, the degree of the downsizing has been limited and, thus, the possible fuel consumption reduction has not yet been fully achieved. On the other hand, other problems are encountered when considering a downsized turbocharged gasoline engine: insufficient low-end torque, poor starting performance, and turbo lag. In order to solve these problems an effective combination of the downsized turbocharged gasoline engine with additional technologies is needed. Thus, the paper will present a so-called adaptive thermal engine, which has at the same time a variable compression ratio and a variable intake valve lift. It will then be demonstrated that it is highly suitable for turbocharging, thus resulting in a high downsizing factor.

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Barelli, L., G. Bidini, and F. Bonucci. "Diagnosis of a turbocharging system of 1MW internal combustion engine." Energy Conversion and Management 68 (April 2013): 28–39. http://dx.doi.org/10.1016/j.enconman.2012.12.013.

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Wang, Shaoming, Kangyao Deng, and Yi Cui. "Variable geometry exhaust manifold turbocharging system for vehicle diesel engine." International Journal of Vehicle Design 57, no. 1 (2011): 37. http://dx.doi.org/10.1504/ijvd.2011.043594.

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Steinparzer, Fritz, Wolfgang Stütz, Helmut Kratochwill, and Wolfgang Mattes. "BMW’s new six-cylinder diesel engine with two-stage turbocharging." MTZ worldwide 66, no. 5 (May 2005): 2–5. http://dx.doi.org/10.1007/bf03227751.

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Herzwan, H. M., A. Azri, and M. Rizalman. "Turbocharging small size engine to increase engine output: An assessment of turbocharger study field." IOP Conference Series: Materials Science and Engineering 469 (January 16, 2019): 012089. http://dx.doi.org/10.1088/1757-899x/469/1/012089.

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Ahmedi, Ranaji Arib Hafiz Ayyub Akbar. "Forced Induction Technologies in an IC Engine: A Review." International Journal for Research in Applied Science and Engineering Technology 9, no. VI (June 25, 2021): 2766–70. http://dx.doi.org/10.22214/ijraset.2021.35582.

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This study has been undertaken to show the performance enhancement of engines using different Forced induction technologies. Forced induction technology like turbocharging and supercharging can enhance the performance of an internal combustion engine by compressing inlet air charge, allowing full engine power to be produced efficiently. As the fuel economy and greenhouse emission standards are projected to be far more stringent globally, the use of a Forced induction engine in passenger cars and light-duty trucks has become an inevitable trend within the automotive industry. A turbocharger system can effectively improve the power and torque of an engine, but turbo hysteresis exists. A mechanical supercharging system can boost at low speed, but the efficiency is lower. An electric supercharger can effectively improve the intake air at the early stage of accelerated working conditions, however, an electric supercharger will consume the engine power. The addition of Forced induction technologies to an IC engine helps with the scope of downsizing it. This review brings forward all the aspects of Forced induction technologies

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Adamkiewicz, Andrzej, and Janusz Fydrych. "Operational Verification of a Ship Main Power System Element Choice – Case Study." Journal of KONES 26, no. 4 (December 1, 2019): 7–14. http://dx.doi.org/10.2478/kones-2019-0120.

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AbstractThe article refers to results and conclusions on post-emergency repairs of a turbo-charging system of a DEUTZ engine of the SBV 8M 628 type of 1715 kW – the main power unit of a cement carrier. The failure of the turbocharger led to severing of a part of the exhaust outlet valve head. In order to determine the cause of the turbocharger fault, parametric identification of the reference state of the turbocharging system interacting with the ship main power engine has been carried out. The post-emergency servicing of the turbocharger comprised mounting a new blade rim of expansive instruments of smaller capacity than the so far used. Control measurement results of the power system after the replacement of the turbocharger turbine nozzle have been presented. Limitations of correct engine operation have been noted in the range of maximum load with continuous power (MCR). A range of corrective maintenance servicing of fuel equipment has been presented. Using the values of measured torque at the propeller shaft, incorrect interaction between the shaft and the main engine has been noted. A new propeller, adequate to the design operational parameters of the engine characteristics, has been chosen and mounted. The correctness of turbine expansive instrument replacement has been verified by correct interaction between the elements of the power system: propeller – main engine – turbocharging system. Thus, a wider range of economically acceptable ship operation has been obtained.

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Wang, Yang, Yin Yan Wang, Fan Shi, and Xin Guang Li. "Performance Calculation of a TBD234V12 Diesel Engine with STC." Applied Mechanics and Materials 157-158 (February 2012): 1075–78. http://dx.doi.org/10.4028/www.scientific.net/amm.157-158.1075.

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A computer model for a TBD234V12 marine high-speed diesel engine with 2 turbocharger(2TC) is built on GT-POWER. For validating the computer model, a calculation to the conventional turbocharging system has been done firstly, and the results show good agreement with experimental data. The computer model has then been used for predictive studies of the diesel engine with the proposed STC system on the mapping characteristics. From these results, it can be seen that the STC system can not only improve the part load performance of the diesel engine obviously, but also enlarge the operating range of the marine diesel engine.

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Osborne, A. G. "Diesel Engine Research at High B.M.E.P." Proceedings of the Institution of Mechanical Engineers, Part A: Power and Process Engineering 199, no. 4 (November 1985): 285–92. http://dx.doi.org/10.1243/pime_proc_1985_199_034_02.

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Demands for more power from the turbocharged diesel, without increase in bulk or weight, has led to an increase in levels of mean effective pressure by the application of high-pressure turbocharging. An investigation was conducted to determine engine performance under high b.m.e.p. conditions and this paper presents results of the experimental part of the research programme. Test work was carried out on a single-cylinder research engine equipped with an independent pressure-charging facility. Boost pressure ratios up to 6.2:1 were used with the geometric compression ratio reduced, in stages, to 8:1, to limit peak cylinder pressure. Power levels up to 35.4 bar b.m.e.p. were produced.

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Zhang, Peng Qi, Jian Wei Du, and Yin Yan Wang. "Grey Theory Approach to Sequential Turbocharged Diesel Engine." Applied Mechanics and Materials 10-12 (December 2007): 934–38. http://dx.doi.org/10.4028/www.scientific.net/amm.10-12.934.

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In order to ensure diesel engine operating reliably, need to forecast the performance parameters of diesel engine. Grey system theory, a method to research poor information and uncertain system, was approached to sequential turbocharged diesel engine. Grey forecast model of boost pressure of sequential turbocharged diesel engine was established. The precision of the forecast model was inspected by grey relation analysis, it is proved that the model has a good precision and is suitable to forecasting boost pressure. The relatively error of the forecast result is 2.5%. And it establishes the base for forecasting control and failure prediction of diesel engine sequential turbocharging system.

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DANILECKI, Krzysztof. "Model of turbo-charging system of traction diesel engine." Combustion Engines 130, no. 3 (July 1, 2007): 35–47. http://dx.doi.org/10.19206/ce-117323.

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This paper presents empirical-mathematical model of turbo-charging for the Diesel engine with sequential turbocharging. The model is based on application of the SW 680 engine characteristics obtained on the basis of average parameters of a cycle as well as fl ow characteristics of turbochargers, for the description of which the methods of multiple regression have been used. The conditions of the turbocharger co-operation with the traction engine have been taken into account by means of pulsation coeffi cients, which ensures suffi cient convergence of numerical calculations with the results of experimental testing.

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Journal articles on the topic 'Engine turbocharging'

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