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On the Intelligent Optimization of the Crevice Structure in a Rapid Compression Machine

Journal of Thermal Science 2024年第3期33卷 1200-1215页

作者： GUO Qiang LIU Jie WU Yingtao WANG Hewu TANG Chenglong YU Ruiguang Department of Power Mechanical Engineering Beijing Jiaotong UniversityBeijing100044China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an710049China State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing100084China Beijing Key Laboratory of New Energy Vehicle powertrain Technology Beijing100044China National International Science and Technology Cooperation Base Beijing Jiaotong UniversityBeijing100044China

In this study,the multi-objective intelligent optimization of the crevice structure in a rapid compression machine(RCM)is carried out based on the RCM simulation model modified with the KIVA-3V program.A multi-objective optimization simulation model of the crevice structure based on the large eddy simulation model coupled with the genetic algorithm NSGA-Ⅲis *** optimization parameters and seven optimization objectives are selected in the optimization *** results show that the genetic algorithm can quickly find the values of the optimized *** crevice volume ratio shows a trade-off relationship with the dimensionless temperature ratio T_(max)/T_(aver)and the tumble ratio.A larger crevice volume can reduce the flow of boundary layer cryogenic gas into the combustion chamber,thus improving the temperature *** addition,the crevice entrance width and the connecting channel length should be smaller,while the volume of the crevice main chamber should be larger,so as to sufficiently introduce the low-temperature gas of the boundary layer into the crevice and reduce their influence on the temperature field of the combustion *** the crevice volume accounts for10%of the total volume,the temperature uniformity of the combustor is significantly enhanced,and when the crevice volume accounts for 30.4%,there is almost no low-temperature vortex in the combustion chamber.

关键词： rapid compression machine adiabatic core area ignition delay period crevice structure

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An approach for IC engine coolant energy recovery based on low-temperature organic Rankine cycle

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Journal of Central South University 2015年第2期22卷 727-734页

作者：付建勤刘敬平徐政欣邓帮林刘琦 research Center for Advanced powertrain Technology Hunan University

To promote the fuel utilization efficiency of IC engine, an approach was proposed for IC engine coolant energy recovery based on low-temperature organic Rankine cycle(ORC). The ORC system uses IC engine coolant as heat source, and it is coupled to the IC engine cooling system. After various kinds of organic working media were compared, R124 was selected as the ORC working medium. According to IC engine operating conditions and coolant energy characteristics, the major parameters of ORC system were preliminary designed. Then, the effects of various parameters on cycle performance and recovery potential of coolant energy were analyzed via cycle process calculation. The results indicate that cycle efficiency is mainly influenced by the working pressure of ORC, while the maximum working pressure is limited by IC engine coolant temperature. At the same working pressure, cycle efficiency is hardly affected by both the mass flow rate and temperature of working medium. When the bottom cycle working pressure arrives at the maximum allowable value of 1.6 MPa, the fuel utilization efficiency of IC engine could be improved by 12.1%.All these demonstrate that this low-temperature ORC is a useful energy-saving technology for IC engine.

关键词： IC engine waste heat recovery organic Rankine cycle cycle efficiency coolant energy

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Analysis and Optimization of Transient Mode Switching Behavior for Power Split Hybrid Electric Vehicle with Clutch Collaboration

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Automotive Innovation 2024年第1期7卷 150-165页

作者： Dehua Shi Sheng Liu Yujie Shen Shaohua Wang Chaochun Yuan Long Chen Automotive Engineering research Institute Jiangsu UniversityZhenjiang 212013China Jiangsu Province Engineering research Center of Electric Drive System and Intelligent Control for Alternative Vehicles Zhenjiang 212013China

The power split hybrid electric vehicle(HEV)adopts a power coupling configuration featuring dual planetary gearsets and multiple clutches,enabling diverse operational modes through clutch engagement and *** multi-clutch configuration usually involves the collaboration of two clutches during the transient mode switching process,thereby substantially elevating control *** study focuses on power split HEVs that integrate multi-clutch mechanisms and investigates how different clutch collaboration manners impact the characteristics of transient mode *** powertrain model for the power-split HEV is established utilizing matrix-based *** the formulation of clutch torque curves and clutch collaboration models,this research systematically explores the effects of clutch engagement timing and the duration of clutch slipping state on transient mode switching *** upon this analysis,an optimization problem for control parameters pertaining to the two collaborative clutches is *** simulated annealing algorithm is employed to optimize these control *** results demonstrate that the clutch collaboration manners have a great influence on the transient mode switching *** with the pre-calibrated benchmark and the optimal solution derived by the genetic algorithm,the maximal longitudinal jerk and clutch slipping work during the transient mode switching process is reduced obviously with the optimal control parameters derived by the simulated annealing *** study provides valuable insights for the dynamic coordinated control of the power-split HEVs featuring complex clutch collaboration mechanisms.

关键词： Power split hybrid electric vehicle Transient mode switching Clutch collaboration Simulated annealing powertrain model

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Squeeze casting of aluminum alloy A380: Microstructure and tensile behavior

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China Foundry 2015年第5期12卷 367-374页

作者： Li Fang Xue-zhi Zhang Bo-jun Xiong Henry Hu Xue-yuan Nie Jimi Tjong Department of Mechanical Automotive & Materials Engineering University of Windsor 401 Sunset Ave. Ford powertrain Engineering research & Development Centre

A380 alloy with a relatively thick cross-section of 25 mm was squeeze cast using a hydraulic press with an applied pressure of 90 MPa. Microstructure and tensile properties of the squeeze cast A380 were characterized and evaluated in comparison with the die cast counterpart. Results show that the squeeze cast A380 possesses a porosity level much lower than the die cast alloy, which is disclosed by both optical microscopy and the density measurement technique. The results of tensile testing indicate the improved tensile properties, specifically ultimate tensile strength(UTS: 215.9 MPa) and elongation(Ef: 5.4%), for the squeeze cast samples over those of the conventional high-pressure die cast part(UTS: 173.7 MPa, Ef: 1.0%). The analysis of tensile behavior shows that the squeeze cast A380 exhibits a high tensile toughness(8.5 MJ·m-3) and resilience(179.3 k J·m-3) compared with the die cast alloy(toughness: 1.4 MJ·m-3, resilience: 140.6 k J·m-3), despite that, during the onset of plastic deformation, the strain-hardening rate of the die cast specimen is higher than that of the squeeze cast specimens. The microstructure analyzed by the scanning electron microscopy(SEM) shows that both the squeeze and die cast specimens contain the primary α-Al, Al2 Cu, Al5 Fe Si phase and the eutectic Si phase. But, the Al2 Cu phase present in the squeeze cast alloy is relatively large in size and quantity. The SEM fractography evidently reveals the ductile fracture features of the squeeze cast A380 alloy.

关键词： squeeze casting aluminum alloy A380 microstructure tensile properties fracture behavior

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Performance of the Transmission Parking Mechanism of a Battery Electric Vehicle Simulated with Adams Software

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Automotive Innovation 2018年第2期1卷 114-121页

作者： Yuan Dong Yong Chen Chuang Yu Zhan Cao Guangxin Li Zhuoqiang Li Genqun Cui School of Mechanical Engineering Hebei University of TechnologyTianjin 300130China powertrain research Institute GeelyHangzhou Bay 315336China

The electric parking mechanism is studied for an electrically controlled two-speed auto transmission that is being developed for electric *** requirements include low-speed safe parking,reliable self-lock and the avoidance of abnormal parking.A dynamic model of the parking mechanism is established and analyzed using Adams ***,failure of the parking mechanism due to wear is observed in bench testing and compared with experimental results after optimization.

关键词： Battery electric vehicle Two-speed auto transmission Parking mechanism Safety performance

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SICE benchmark problem:starting speed control of SI engines

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Control Theory and Technology 2019年第2期17卷 138-147页

作者： Junichi KAKO Advanced powertrain Planning&Management Div.Toyota Motor Corporation ShizuokaJapan

Starting the engine and quickly adjusting the engine speed to the target value after that will always be a challenge for vehicles with an internal combustion engines at development sites in the automotive *** SICE research Committee on Advanced powertrain Control Theory provided this task as a benchmark problem with the engine *** as control developers in the industry are provided actual engines,many of the academic experts have acquired engine models,analyzed behavior and constructed controls,and solved control *** summarize this activity by explaining the methods by many challengers that achieved the target performance.

关键词： Engine start control benchmark problem engine model

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Effects of working parameters on gasoline engine exergy balance

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Journal of Central South University 2013年第7期20卷 1938-1946页

作者： LIU Jing-ping FU Jian-qin FENG Ren-hua ZHU Guo-hui research Center for Advanced powertrain Technology Hunan University Changsha 410082 China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body (Hunan University) Changsha 410082 China

To improve the energy utilization efficiency of internal combustion （IC） engine, exergy analysis was conducted on a passenger car gasoline engine. According to the thermodynamic theory of IC engine, in-cylinder exergy balance model was built. The working processes of gasoline engine were simulated by using the GT-power. In this way, the required parameters were calculated and then gasoline engine exergy balance was obtained by programming on computer. On this basis, the influences of various parameters on exergy balance were analyzed. Results show that, the proportions of various forms of exergy in gasoline engine from high to low are irreversible loss, effective work, exhaust gas exergy and heat transfer exergy. Effective exergy proportion fluctuates with cylinder volumetric efficiency at full load, while it always increases with break mean effective pressure （BMEP） at part load. Exhaust gas exergy proportion is more sensitive to speed, and it increases with speed increasing except at the highest speed. The lower proportion of heat transfer exergy appears at high speed and high load. Irreversible loss is mainly influenced by load. At part load, higher BMEP results in lower proportion of irreversible loss; at full load, the proportion of irreversible loss changes little except at the highest speed.

关键词： gasoline engine exergy balance waste heat recovery thermal efficiency energy conservation

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A High-Efficiency Two-Stroke Engine Concept: The Boosted Uniflow Scavenged Direct-Injection Gasoline (BUSDIG) Engine with Air Hybrid Operation

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Engineering 2019年第3期5卷 535-547页

作者： Xinyan Wang Hua Zhao Center for Advanced powertrain and Fuels Brunel University London Uxbridge UB8 3PH UK

A novel two-stroke boosted uniflow scavenged direct-injection gasoline (BUSDIG) engine has been proposed and designed in order to achieve aggressive engine downsizing and down-speeding for higher engine performance and efficiency. In this paper, the design and development of the BUSDIG engine are outlined discussed and the key findings are summarized to highlight the progress of the development of the proposed two-stroke BUSDIG engine. In order to maximize the scavenging performance and produce sufficient in-cylinder flow motions for the fuel/air mixing process in the two-stroke BUSDIG engine, the engine bore/stroke ratio, intake scavenge port angles, and intake plenum design were optimized by three-dimensional (3D) computational fluid dynamics (CFD) simulations. The effects of the opening profiles of the scavenge ports and exhaust valves on controlling the scavenging process were also investigated. In order to achieve optimal in-cylinder fuel stratification, the mixture-formation processes by different injection strategies were studied by using CFD simulations with a calibrated Reitz–Diwakar breakup model. Based on the optimal design of the BUSDIG engine, one-dimensional (1D) engine simulations were performed in Ricardo WAVE. The results showed that a maximum brake thermal efficiency of 47.2% can be achieved for the two-stroke BUSDIG engine with lean combustion and water injection. A peak brake toque of 379 N·m and a peak brake power density of 112 kW·L^-1 were achieved at 1600 and 4000 r·min^-1, respectively, in the BUSDIG engine with the stoichiometric condition.

关键词： Two-stroke engine Uniflow scavenging Engine design simulation Scavenging performance Thermal efficiency

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A Study of Injector Matching on a High Thermal Efficiency TGDI Gasoline Engine

A Study of Injector Matching on a High Thermal Efficiency TG...

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2023中国汽车工程学会年会暨展览会

作者： Huang Qianhai Ling Qinghai Lian Yuan Jiang Xiaolin Tang Jiang Tang Derun SERES powertrain research Institute

By using a visual single-cylinder transparent engine and thermodynamics test bench,this paper aims to research the suitable injector for a high thermal efficiency(BTE 42%) TGDI gasoline *** focuses on the matching with a high tumble ratio combustion chamber with different spray angle,spray target position,as well as the influence on the characteristics of in-cylinder flow,combustion and emissions,to find the suitable injector for a high tumble ratio of the combustion *** test results show that a5-hole injector has the best matching with the combustion chamber and in-cylinder flow,which can effectively reduce the risk of spray impact piston head and cylinder *** with the multiple injection strategy,higher power,torque and lower part-load fuel consumption are achieved,as well as optimal emissions.

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Design and dynamic simulation of hydraulic system of a new automatic transmission

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Journal of Central South University 2009年第4期16卷 697-701页

作者：王书翰徐向阳刘艳芳戴振坤 TEN BERGE P 曲巍 School of Transportation Science and Engineering Beijing University of Aeronautics and Astronautics Institute for Engineering Design and powertrain Technologies Chemnitz University of Technology

A new hydraulic system of a novel automatic transmission (AT) was designed. The dimension and structure of valves and cylinders were designed by theoretical calculation. The dynamic simulation model of hydraulic system of AT was established by ITI-SimulationX. Simulation results and theoretical design results were compared to confirm the simulation model. Based on the confirmed simulation model, the simulation results of pressure and flow of the hydraulic system were analyzed. The dynamic simulation method is very helpful for designing and analyzing the performance of hydraulic system and further optimization design. The theoretical design method and dynamic simulation model are feasible for the real industrial applications. The research results can be used in hydraulic system design and optimization.

关键词： automatic transmission hydraulic system dynamic simulation

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