Research On Electric Vehicle Motor Control System Based On Semi-physical Simulation Platform

As global resource and environmental problems have become more serious,electric vehicles have developed rapidly in recent decades and have become more widely used.In my country,the new energy automobile industry is already in a national strategic position.The level of electric drive technology of electric vehicles determines the upper limit of vehicle performance.The research of motor control has attracted more and more people’s attention.This paper selects the BLDCM with low vibration noise,high power density and good starting performance as the research object,designs the BLDCM controller,uses Simulink to establish the model of the BLDCM and the controller,and selects a variety of working conditions Carry out simulation analysis,compare with the experimental data of the hardware-in-the-loop simulation platform to verify the effectiveness of the control algorithm.In this paper,a differential equation is established according to the working characteristics of the BLDCM and the motor structure,and a simulation model is established in Simulink software based on the differential equation.The motor control system adopts speed-current double closed-loop control,the speed controller adopts two control algorithms,which are neural network PID control and fuzzy PID control,and the current inner loop adopts a current hysteresis controller.Based on the above work,a simulation model of the motor control system is built.According to the working environment of the electric vehicle motor,the simulation conditions are set to sudden load after no-load start,sudden speed drop after high speed start,and sudden drop after load start After the load and low-speed load are started,a total of 4 operating conditions are accelerated for simulation tests.The data of output speed,electromagnetic torque,threephase current and three-phase reverse electromotive force obtained through simulation experiments show that the BLDCM control system designed in this subject has rapid response,no static error,good robustness,and meets the design requirements.Finally,a semi-physical simulation platform including ECU(ECM-0565-128-0702-C),Moto Hawk control box,motor drive board and BLDCM is established.Based on the double closed-loop control system of BLDCM,And transform the control model into a Moto Hawk model.Download the converted simulation model to the controller,and through the semi-physical simulation,the reliability of the control system is further verified.