Study On Parameter Matching And Coordinated Control For Dual-Motor Hybrid Power-Train System

The deep mixed Plug-In hybrid power-train system that comprise dual-motor within the gearbox is studied in this paper, which is from the follow-up studies of the project sponsored by the state"863"high-tech program (No.2008AA11A140)"Development of New Vehicle Technologies for the JieFang Hybrid Electric Bus of FAW"and the jointed action project among Jilin province, FAW, and Jilin university"Pre-research on the Key Technologies for the Second Generation Hybrid Electric BUS of FAW". Aiming at problems in the design of hybrid electric vehicle in the worldwide, especially in China, which are mainly located in parameter matching, inherent in the AMT of hybrid electric vehicle, and control of multiple power sources etc, the new methods of parameter matching and coordinated control of hybrid power-train system were proposed in this paper. The purpose of this study is to improve the efficiency of hybrid power-train system, perfect the parameter matching theory and control method of hybrid power-train system. Focusing mainly around the study of the hybrid power-train system parameter matching that include power matching and efficiency matching, the study on the ideal driving characteristics and dynamic coordinated control of dual-motor hybrid power-train system, the study on the energy manyment and coordinated control of multiple power sources of dual-motor hybrid power-train system, five aspects of research contents were proposed in this paper.1. The forward co-simulation platform of hybrid electric vehicle based on CRUISE and MATLAB/SIMULINK was established in this paper. The precision check method of co-simulation model was studied and the forward simulation model database was founded, which will be a valuable preparation for theoretical research, simulation analysis, configuration analysis, parameter matching, special energy-saving analysis and control strategy building for hybrid electric vehicle.2. Aiming at the questions of general power matching that determine the power of energy source, does not take into account the high efficiency area of energy source and also the matching between the high efficiency area and power requirements of driving cycle, which would lead to lower actual running efficiency of energy source, a new parameter matching method of hybrid power-train system that combine power matching and efficiency matching was proposed in the paper. The economic target of this method is to have the power-train working with high efficiency in driving cycle and the dynamic performance is just as the constraint of power matching. The design condition and characterization methods of high efficiency area of energy source were studied and the design principle and technical specifications for the special requirement of the engine and motor for hybrid power-train system were proposed. It would require the rpm range and torque range that decided by the high efficiency area cover the power need of driving cycle completely under the action of the gearbox, and make sure the high running efficiency of power source, and then the energy-saving, and emission reduction capability will be enhancing greatly.3. In order to solve the inherent questions of traditional AMT, such as, the vehicle could not start without the clutch sliding control, and the power interrupt and torque mutation while shifting, the comprehensive coordination control of automatic transmission technology and hybrid technology was studied and the hybrid control technology is combined into automatic transmission. It could make the variable transmission of dual-motor hybrid power-train system have the torque output characteristics of continuous variable transmission and realize the ideal driving characteristic and then the comprehensive performance of hybrid system.4. According to the theory of self-adaptive control and sliding mode variable structure control, the self-adaptive sliding mode variable structure control of dual-motor hybrid power-train system was developed to solve the existing problems of hybrid system control. For example, the intelligent control strategy could not be used in the actual vehicle control, the logic threshold control strategy used in the vehicle could not take into account both the economic and dynamic of vehicle, which would lead to less desired adaptive capability of hybrid electric vehicle for difference driving cycles and difference driver'habit. The self-adaptive control and sliding mode variable structure control divides the power-train control into starting control, electric drive control in low speed, engine drive control in high speed, united drive control in low speed, united drive control in high speed and regenerative braking control. It could coordinate and control the power output of the three power source of dual-motor hybrid system and enhance the self-adaptive ability of dual-motor hybrid system to achieve the energy-saving and emission reduction targets.5. The dual-motor hybrid system testing bench was build to meet the requirements of the PhD thesis and also the schedule requirements of the projects. The prototype vehicle of dual-motor hybrid system was also build based on the testing bench. The parameter matching method, coordinate control method of automatic transmission technology and hybrid technology, the self-adaptive sliding mode variable structure control of dual-motor hybrid power-train system were tested and verified with the test bench and the vehicle prototype. Simulation and testing results show that the economic and dynamic of dual-motor hybrid electric vehicle have been improved dramatically.