Research On Vehicle Control Strategy Of Four-Wheel Independent Drive Electric Vehicle Based On Flux-Weakening Condition

Four-wheel independent drive electric vehicle is one of the main structures in the future,which is characterized by its high efficiency,When the car is running at high speed,the four-wheel independent drive electric vehicle will enter the weak magnetic field,and the motor driving torque will be different in different weak magnetic range,the stability of the vehicle is affected,in this paper,the control strategy of four wheel independent drive electric vehicle is designed based on the target optimization algorithm:1.This paper studies the dynamic analysis of wheel motor and vehicle of four wheel hub electric vehicle.The control strategy and driving control system of the hub motor are studied emphatically,and the body dynamics model and the tire model2.The characteristics of the motor under the field weakening condition are studied.In the high speed operation of the motor,the field weakening control is adopted,and the characteristics of the motor output torque are analyzed,and the simulation is verified.Through a single motor undermined magnetic field conditions to analyze the four wheel motor undermined magnetic field conditions are not the same vehicle control3.The vehicle control strategy for four wheel torque distribution is designed.In four cases of weak magnetic wheel motor caused by the inconsistency of the output torque under different circumstances,the vehicle stability control target,design the torque allocation algorithm based on multi-objective optimization,and verified by simulation.The results show that the proposed control strategy can guarantee the stable running of vehicles at different speeds and weak magnetic conditions.