Study On Electronic Differential Speed Of Wheel Hub Electric Vehicle

Nowadays,with the problem of environmental pollution and energy crisis becoming more and more serious,the development of traditional automobile is hindered,people have to find a new technology to replace the traditional automobile.With the advantages of zero emission,high energy utilization and low noise,electric vehicle has become a hot spot in the field of automobile research,which has been paid more and more attention in recent years.Although the electric vehicle develops rapidly,but compared with the traditional fuel vehicle,some key technology still lags behind,the electronic differential speed controller is one of the key technologies of the electric vehicle.The so-called electronic differential speed is the control of the car steering by electronic means when the wheels are driven by a certain speed difference.The aim is to complete the steering in a pure rolling mode to ensure that the wheels do not slip or slip.In this paper,two-wheel-wheel-hub electric vehicle is used as the research object,and the electronic differential speed method is constructed.According to the requirement of vehicle performance,permanent Magnet brushless DC motor is used as driving control of electric vehicle,and the working principle,mathematic model and double closed loop speed regulation system of Permanent Magnet brushless DC motor are analyzed in detail.In this paper,the whole vehicle model is built by using Adams software,and the relation data between steering wheel rotation and rotational speed under different speed are obtained through simulation,and the PSO-BP neural network model is used to predict wheel speed based on the obtained data.Due to the uncertainty of road condition,the required wheel speed will be based on the PSO-BP neural network model to predict the speed of some fluctuations,at this time,with the slip rate detection controller,slip rate control within a reasonable range,so that the actual state of the wheel feedback adjustment,thus expanding the electronic differential control system adaptability.This paper establishes the motor and differential control model in Matlab/Simulink software,and verifies the feasibility and reliability of the design method by simulation analysis.