Parameter Matching And Verification Of The Power System Of Pure Electric Vehicles

With the increasing demands of various countries on the emission of traditional fuel vehicles,the development of hybrid electric vehicles and new energy vehicles has become a mainstream trend in the automotive industry.In addition,the development of pure electric vehicles in new energy vehicles is more mature and the prospects for development are clearer.In the process of designing its,an important process is to match the parameters of the power system.The main work is to match the parameters of the driving motor,the power battery and the speed ratio of the transmission system.The matching results directly affect the dynamic and economic performance of the vehicle.In this paper,a new pure electric vehicle is used as the research object,and the parameters of power system,such as motor and power battery are matched,and the speed ratio of transmission system is optimized with the help of genetic algorithm.Finally,the rationality of the optimization results is verified by the simulation analysis software.This paper by studying the basic structure and working principle of pure electric vehicles,combined with the advantages and disadvantages of different types of drive motor and power battery,according to the market positioning of the vehicle dynamic economic targets,the form of vehicle driving,driving motor and power battery types are defined.On the basis of analyzing vehicle driving resistance,preliminary matching of dynamic parameters is carried out according to vehicle theory.Then,CRUISE simulation analysis software is used to construct the simulation analysis model,which verifies the feasibility of the matching result.Finally,through the genetic optimization algorithm to meet the dynamic target,the speed ratio parameters of the transmission system are optimized by MATLAB software,and the effectiveness and feasibility of the optimization results are verified according to the simulation model built earlier.The main performance targets designed in this paper are the acceleration capacity,maximum climbing ability,and the driving range and 100 kilometer power consumption of the vehicle operating condition(NEDC).The analysis shows that,under the premise of keeping the power of the whole vehicle,reducing the transmission ratio of the transmission system can improve the economic performance of the vehicle.