Research On Matching And Optimization Of Electric Vehicle Powertrain

The research content of subject is based on the'EV series electric vehicle performance improvements'project which is organized by Jinzhou Wonder Alternative Energy Auto Technology Co.,Ltd. The vehicle powertrain is matched reasonable based on vehicle theory, vehicle system dynamics, motor theory and electrochemical energy. The matching results are simulated by AVL Cruise. The transmission ratio of the transmission system is optimized reasonable by matlab/ genetic algorithm toolbox. The matching results are simulated by AVL Cruise and tested by real vehicle. The correctness of the optimization is verified.The specific research content and results of subject can be summarized as follows:1) The research purpose and significance of subject are discussed. The research of electric vehicles at home and abroad, the results and development direction are discussed.2) Energy type, capacity and single cells number of the electric vehicle battery are defined. Rated power, peak power, rated torque, rated speed and operating voltage of the motor are defined. Transmission ratio of the transmission system is defined. All these are based on vehicle theory, vehicle system dynamics, motor learning and electrochemical energy.3) The matching results are simulated by AVL Cruise.4) The transmission ratio of the transmission system is optimized reasonable by matlab/ genetic algorithm toolbox with range as the optimization object. The encoding, genetic operators, design variables and fitness function are defined. The matching results are simulated by AVL Cruise. The matching result and the optimized result are compared. The correctness of the optimization is verified.Some theoretical basis is provided to the initial design of electric vehicle which is proposed by the vehicle matching research of the subject. Some theoretical basis and reference value are provided to the electric vehicle dynamic and energy economy enhance research, which is proposed by the optimization research of transmission ratio. It has some practical significance.