Research And Design Of Electric Vehicle Control Strategy

With the aggravation of global energy and environmental problems,more and more attention has been paid to electric vehicles which is energy-saving and environmental protection.The development of electric vehicles is inevitably inseparable from the study of vehicle controller.Vehicle control technology is one of the three core technologies in the field of electric vehicles,which has attracted the attention of researchers all over the world.Based on a pure electric vehicle,this paper studies vehicle power system parameter matching and vehicle control strategy.Firstly,the structure of power system of electric vehicle is analyzed and introduced,and the power and economy indexes are formulated according to the prototype.Through the dynamic analysis of electric vehicle,the matching calculation of relevant parameters of driving motor and power battery is carried out.Finally,the type and parameters of components are determined according to the market situation,and the matching of motor parameters is mainly studied.Secondly,according to the driving characteristics of electric vehicles,the vehicle control strategy is divided into four parts.The driving control strategy and regenerative braking control strategy are mainly studied.In the drive control strategy,vehicle working mode,acceleration pedal signal processing,reference torque and torque compensation are studied in order to obtain good dynamic performance.In order to improve the economy,a parallel regenerative braking control strategy based on ECE R13 is proposed based on the judgment of braking strength.Thirdly,the vehicle model is built in AVL CRUISE,and the control strategy model is built by MATLAB/Simulink.The two models are simulated jointly.The simulation results show that the relevant performance indicators are satisfied,and the effective torque compensation is carried out in the driving control strategy to meet the driving requirements.The braking energy recovery rate of the regenerative braking control strategy in this paper reaches 48.08% under NEDC_man₉0 condition,which has a good energy feedback effect.Finally,a part of the vehicle controller is studied and designed.The hardware circuit is built with modularization idea,and the minimum MCU system and peripheral circuit are built with suitable main control chip.The software part of the system is designed with layered idea.