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Yang Y.,Chongqing University | Gong H.,SAIC | Qin D.-T.,Chongqing University | Su L.,Chongqing Changan New Energy Automobile CO. | Lin G.-Y.,Changan University
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | Year: 2014

In order to improve the economy of full hybrid electric vehicle (HEV) equipped with continuously variable transmission (CVT), system efficiency optimization models for various operating modes were built with consideration of efficiency of engine, integrated starter and generator (ISG), battery and CVT. Two driving schemas, charge consumption plan and charge growth plan, were proposed. For the target of instantaneous optimization of system efficiency, the energy management strategy was established. The cycle simulation model of full HEV with CVT was established using MATLAB/Simulink. The simulation was performed under NEDC working condition. The results show that fuel consumption of full HEV with CVT by employing the control strategy proposed in this paper decreases by 10.42%, compared with the strategy in ADVISOR, and compared with the power equivalent traditional vehicle, decreases by 39.77%. The control strategy proposed in the article can also control the battery state of charge within a reasonable range of operation.


Yang Y.,Chongqing University | Li X.-Q.,Chongqing University | Su L.,Chongqing Changan New Energy Automobile CO. | Huang J.-F.,Chongqing University
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | Year: 2014

A full hybrid electric vehicle with an electric motor and two clutches was used to determine the boundary conditions of the operation mode-switch and the torque requirement of engine. In order to meet the power and ride comfort, the coordinated torque control strategy and fuzzy control of limiting torque clutch were developed. The simulation model and control strategy model were established and the processes of mode switching were simulated for analysis. The results show that this system can rapidly and stably make the motor to start the engine and the control strategy can reduce the torque surge and improve the ride comfort during mode-switch process.


Zeng Y.,Chongqing University | Qin D.,Chongqing University | Su L.,Chongqing Changan New Energy Automobile CO. | Yao M.,Chongqing University
Qiche Gongcheng/Automotive Engineering | Year: 2016

Base on the vehicle powertrain system model, engine thermodynamics and fuel consumption model, and cabin thermal exchange model, CD-CS mode control strategy, Pontryagin's minimum principle (PMP)-based comprehensive real-time heating control strategy and PMP-based active comprehensive real-time heating control strategy are studied with consideration of cabin heating power demand. Then the above-mentioned three control strategies are simulated on Matlab/Simulink platform. The results show that under the commuter driving cycle composed of UDDS and HWFET, compared with CD-CS mode control strategy and PMP-based comprehensive real=time heating control strategy, the engine fuel consumption with PMp-based active comprehensive real-time heating control strategy reduces by 10.9% and 4.97% respectively. © 2016, SAE-China. All right reserved.


Ye X.,Xian Jiaotong University | Qin D.-T.,Xian Jiaotong University | Hu M.-H.,Xian Jiaotong University | Duan Z.-H.,Chongqing Changan New Energy Automobile CO. | Chen Q.-H.,Xian Jiaotong University
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2010

The system efficiency of ISG (integrated starter/generator) type medium hybrid electric vehicle (HEV) is optimized by combining transient and global optimization method under given driving mode, and energy management strategy of the hybrid system is optimized to reach the highest hybrid system efficiency. In order to avoid dynamic fuel increasing caused by engine throttle mutation during driving mode shifting or acceleration, closed-loop control of inertia moment of engine and compensation control of motor torque are adopted to coordinate the medium hybrid system to suppress over fuel injection of the ICE caused by engine throttle mutation. Model of medium hybrid electric vehicle is built and simulation is carried out. The results show that the throttle coordinated control can improve fuel economy, under the condition of guaranteed dynamic performance.


Zeng Y.,Chongqing University | Zeng Y.,Jiangsu University | Qin D.,Chongqing University | Su L.,Chongqing Changan New Energy Automobile CO. | Yao M.,Chongqing University
Qiche Gongcheng/Automotive Engineering | Year: 2016

The component parameters of powertrain and the parameters of control strategy are coupled each other, and they affect the power performance, fuel economy and emission together. This paper aims to conduct a multi-objective optimization on the power performance, fuel economy and emission of the powertrain in a plug-in HEV. Firstly, a transient energy management control strategy is presented for optimizing the efficiency of powertrain. Then with minimizing the cost, fuel consumption with consideration of engine thermal state and emission as optimization objectives, the component parameters of powertrain and the parameters of control strategy are concurrently optimized by using multi-objective genetic algorithm with a Pareto optimal solution set obtained. The results show that compared with original vehicle, the fuel consumption and emission performances of the vehicle corresponding to Pareto solution set are all obviously improved, except a few solutions having a slight increase in NOx emission. In addition, Pareto solution set provide many optimal schemes of feasible parameter combinations, and the designers can select the parameter combination they desire based on their preferences among cost, fuel economy and emission. © 2016, Society of Automotive Engineers of China. All right reserved.

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