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The 2nd International Conference on Computer-Aided design, Manufacturing, Modeling and simulation(CdMMS 2012)

作者： Bing Zhu Litong Guo Jian Zhao Fang Gao Zhen Pan Luquan ren State Key Laboratory of Automotive Simulation and Control Jilin University Key Laboratory of Bionic Engineering of Ministry of Education Jilin University China FAW Group Corporation R&D Center

ISBN: (纸本)9783037855409

This paper presents a direct Yaw-moment Control(dYC) strategy to prevent light vehicles from entering the unsteady state and improve the handling stability.A novelty of this work is the ability to achieve superior performance through the lower workload of the actuators by using the optimal control allocation method to distribute the active yaw *** the main-loop,the dYC controller is designed based on the classical PId algorithm with the yaw rate and sideslip angle *** tests are carried out on the conditions of sine steering and single lane change *** indicate that the working potential of each actuator can be fully utilized and a significant improvement in handling stability can be achieved from the dYC system.

关键词： Automotive Engineering direct Yaw-Moment Control Control Allocation

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Effect of design Parameters on the reduction of Top Piston ring Friction

Effect of Design Parameters on the Reduction of Top Piston R...

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The 2nd International Conference on Computer-Aided design, Manufacturing, Modeling and simulation(CdMMS 2012)

作者： Bin Wu Zhinan Zhang Ping Wang State Key Laboratory of Automotive Simulation and Control Jilin University China FAW Group Corporation R&D Center School of Mechanical Engineering Shanghai Jiao Tong University Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of Sciences

In order to reduce ring-liner interface friction power loss,this paper focuses on the structure parameters of the top ring,and investigates how the value of those parameters will influence top ring-liner friction power loss and the minimum thickness of oil film at top ring-liner interface.A mixed lubrication model is developed to simulate the effect of varying design parameters on ring-liner *** study shows that ring-liner friction power loss will be reduced with decreased axial ring height and barrel *** study provides a theoretical basis for design the top ring with reduced friction power loss at ring-liner interface.

关键词： Piston ring,Friction,Lubrication,Oil Film

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Temperature Field in Electric Control Unit of diesel Engine and Its Optimization design

Temperature Field in Electric Control Unit of Diesel Engine ...

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The 2011 International Conference on Mechanical Properties of Materials and Information Technology (ICMPMIT 2011)

作者： Liu Zhenjie Lei Yulong Li Yongjun State Key Laboratory of Automobile Dynamic Simulation Jilin University R&D Center of FAW

In order to satisfy the requirements of the high reliability of electric control unit(ECU) of the diesel Engine,the thermal analysis of ECU was performed by using the software FLOTHErM based on the finite volume *** temperature field of ECU was obtained under different operating *** structural optimization of ECU was completed to solve the problem of local high *** a result,the operational temperature of ECU is reduced under the allowable limit,and its reliability is *** physical experiment shows that the thermal analysis and structural optimization are *** local high temperature could be reduced effectively and the operational reliability is improved.

关键词： ECU diesel Engine Thermal Analysis

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Influence of different diffuser Angle on Sedan's Aerodynamic Characteristics

Influence of Different Diffuser Angle on Sedan's Aerodynamic...

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2011 International Conference on Physics Science and Technology (ICPST 2011)

作者： Xingjun HU rui ZHANG Jian YE Xu YAN Zhiming ZHAO State Key Laboratory of Automobile Simulation and Control Jilin University Changan Auto Global R&D Center

The aerodynamic characteristics have a great influence on the fuel economics and the steering stability of a high speed vehicle. The underbody rear diffuser is one of important aerodynamic add-on devices. The parameters of the diffuser, including the diffuser angle, the number and the shape of separators, the shape of the end plate and etc, will affect the underbody flow and the wake. Here, just the influence of the diffuser angle was investigated without separator and the end plate. The method of Computational Fluid dynamics was adopted to study the aerodynamic characteristics of a simplified sedan with a different diffuser angle respectively. The diffuser angle was set to 0°, 3°, 6°, 9.8° and 12° respectively. The diffuser angle of the original model is 9.8°. The conclusions were drawn that when the diffuser angle increases, the underbody flow and especially the wake change greatly and the pressure change correspondingly;as a result, the total aerodynamic drag coefficients of car first decrease and then increases, while the total aerodynamic lift coefficients decrease.

关键词： Computational fluid dynamics sedan diffuser angle aerodynamic characteristics

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Influence of different diffuser Angle on Sedan's Aerodynamic Characteristics

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Physics Procedia 2011年 22卷 239-245页

作者： Xingjun Hu rui Zhang Jian Ye Xu Yan Zhiming Zhao State Key Laboratory of Automobile Simulation and Control Jilin University Changchun 130022China Changan Auto Global R&D Center Chongqing 401120China

The aerodynamic characteristics have a great influence on the fuel economics and the steering stability of a high speed vehicle. The underbody rear diffuser is one of important aerodynamic add-on devices. The parameters of the diffuser, including the diffuser angle, the number and the shape of separators, the shape of the end plate and etc, will affect the underbody flow and the wake. Here, just the influence of the diffuser angle was investigated without separator and the end plate. The method of Computational Fluid dynamics was adopted to study the aerodynamic characteristics of a simplified sedan with a different diffuser angle respectively. The diffuser angle was set to 0°, 3°, 6°, 9.8° and 12° respectively. The diffuser angle of the original model is 9.8°. The conclusions were drawn that when the diffuser angle increases, the underbody flow and especially the wake change greatly and the pressure change correspondingly; as a result, the total aerodynamic drag coefficients of car first decrease and then increases, while the total aerodynamic lift coefficients decrease.

关键词： Computational fluid dynamics sedan diffuser angle aerodynamic characteristics

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Thermal Management of diesel Engine ECU

Thermal Management of Diesel Engine ECU

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2011 Seventh International Conference on Natural Computation(第七届自然计算国际会议 ICNC 2011)

作者： Zhenjie Liu Yulong Lei Yucheng Jiao Yongjun Li Sihai Liu State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun China R&D Center of FAW Changchun China

According to diesel Engine ECU drive circuit, the drive current of each components measured with the Active Current Clamp was analyzed. According to the drive current of Solenoid pump valve, the heat dissipation of each component was calculated, and then the thermal simulation model was built and the ECU temperature calculated. In addition, an experiment was done to verify the accuracy of the thermal simulation model at 25 °C environment. The experiment shows that simulation balance results is almost the same as experimental balance results, there are no more than 1 °C difference between simulation results and experimental results, verifies the accuracy of the thermal simulation model.

关键词： ECU diesel Engine Thermal Analysis Solenoid valve drive circuit

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Numeric investigation of EGr and post-injection diesel emissions

Numeric investigation of EGR and post-injection diesel emiss...

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International Conference on Transportation, Mechanical, and Electrical Engineering (TMEE)

作者： Zhaojie Shen Zhongchang Liu Liu Yu Niu Xinchun State Key Laboratory of Automotive Simulation and Control Jilin University Changchun 130025 China State Key Laboratory of Automotive Simulation Control Jilin University Changchun China FAW Group Corporation R&D Center Jilin Changchun 130025 China FAW Group Corporation R&D Center Changchun Jilin China

In this paper, the effects of post-injection with EGr (exhaust gas recirculation) on diesel emissions are investigated to provide fundamental basis for controlling of EGr and post-injection on diesel. Various EGr rate with or without post-injection keeping the same total injection fuel under the speed of 1650r/min and 50% load conditions were simulated. It was found that soot emissions could keep constant as EGr rate increasing with post-injection compared to without post-injection conditions under low EGr rate (lower than 5%), at the same time NO emissions effectively decreased about 5%. However, as EGr rate is going to increase, soot emissions worsen sharply. different dwell of Main and Post injection has irregular effects of NO and soot emissions under higher EGr rate of 14.7%, at the same time. NO and soot emissions changed regularly as main and post injection dwell increasing. It was also found that as Main injection timing advancing, the indicated thermal efficiency and soot emissions under high EGr rate were improved. And with 20% EGr, main injection timing advanced to 20° CA BTdC, the indicated thermal efficiency and soot emissions are more perfect than non-EGr.

关键词： Combustion Fuels Timing diesel engines Mathematical model Atmospheric modeling

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Optimization of ride comfort and handing stability base on virtual prototyping

Optimization of ride comfort and handing stability base on v...

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International Conference on Natural Computation (ICNC)

作者： Yue Cheng Wen-ku Shi Wei Liu Guo-Hui Sun State Key Laboratory of Automobile Dynamic Simulation Jilin university Changchun China China FAW Group Corporation R&D Center Changchun China

ride comfort and handing stability are the two important driving features of vehicle. In the process of suspension design, ride comfort and handing stability are two conflicting considerations. Magneto-rheological(Mr) fluid dampers are a new class of devices that more suitable for the requirements of automotive applications, including having very low power requirements. According to different driving conditions and body posture, semi-active suspension based on Mr damper can coordinate the body posture angle, and reduce the vibration from suspension pass to vehicle body. This paper deals with theoretical analysis and experiments of Mr fluid damper in semi-active suspension system. Based on a large number of experimental data, a mathematical Mr damper model was adopted to predict both the force-displacement behavior and the complex nonlinear force-velocity response. For the purpose of developing semi-active controller, a detailed vehicle Virtual Prototyping model with steering, frame and semi-active suspensions systems was established by vehicle dynamics simulation software SIMPACK. The co-simulation of ride comfort and handing stability showed that the semi-active suspension designed in this paper was suitable for solving the conflict between ride comfort and handing stability, and improve the ride and handing performance simultaneously.

关键词： Vehicles Shock absorbers Stability analysis Mathematical model Acceleration Virtual prototyping

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Integrative braking control system for electric vehicles

Integrative braking control system for electric vehicles

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IEEE Conference on Vehicle Power and Propulsion (VPPC)

作者： Liang Chu Liang Yao Jian Chen Libo Chao Jianhua Guo Yongsheng Zhang Minghui Liu Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun Jilin China R&D Center FAW group corporation of China Changchun Jilin China

For Electric Vehicle (EV), energy saving and endurance mileage prolonging are very important. regenerative braking techniques are key parts of electric techniques for saving energy. The traditional braking system must be updated to adapt the condition that the friction braking force is coexisting with the motor regenerative braking force. For the integrative braking control system it is so important to keep the traditional braking performance while recovering braking energy and fully exert the capability of the motor. In this paper, a new integrative braking control system will be studied. The simulation results based on the AdVISOr and the HIL test bench validate the effects of the system, such as energy recovering and braking performance.

关键词： Force Friction Axles Control systems Hybrid electric vehicles simulation

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Effects of EGr rate and excess air ratio on the combustion characteristics of compressed natural gas engine

Effects of EGR rate and excess air ratio on the combustion c...

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International Conference on Transportation, Mechanical, and Electrical Engineering (TMEE)

作者： Xiao-cao Yu Zhong-chang Liu Zhong-shu Wang Hui-li dou State Key Laboratory of Automobile Simulation and Control Jilin University Changchun P.R.C. China FAW Group Cooperation R&D Center Changchun P.R.C.

The influence of EGr (exhaust gas recirculation) rate and excess air ratio (λ) on the combustion and emissions of a twofold dilution compressed natural gas (CNG) engine CA6SE3-21E4N were investigated experimentally to solve the limited decreasing-ability on NO x emissions with air dilution. The results show that as EGr rate and λ increase, the peak of cylinder pressure and heat release rate decrease and delay, the heat release centroids and the start of combustion move backward, the main combustion duration becomes longer and then the flame propagation velocity slows down. The cyclic variations intensify versus the EGr rate and λ increase. With smaller λ than that of air dilution under equivalent NO x emission levels, the twofold dilution makes the engine operating more stably. Considering the trade-off between NO x emissions and fuel economy, values as optimal control point can be obtained under 1750r/min, 75% load conditions, namely, λ is 1.35, EGr rate is 7%.

关键词： Combustion Engines Natural gas Fuel economy Heating Valves

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