Study On Electronic Differential Speed Control Of Wheel Hub Electric Vehicles Based On Slip Ratio

With the continuous development of the global automotive industry, the automotive industry needs to seek new sources of power to save energy and reduce pollution. The hub type electric vehicle is a green power source vehicle, which has the advantages of save energy and reduce pollution. The automobile steering stability is an important factor that influences the safety and ride comfort of the vehicle. With the gradual improvement of the automobile control system and the continuous development of computer technology,electronic differential control system of electric vehicle has become the research focus of researchers. In this paper, we deeply study the electronic differential control technology of the wheel hub motor, which has a very important significance to improve the safety of the electric vehicle.In this paper, the research on electronic differential speed control of wheel hub electric vehicles based on the slip ratio is studied.The method of linear quadratic optimal sliding mode control method is presented based on linear quadratic optimal control and sliding mode control. A vehicle dynamics model with three degrees of freedom including the longitudinal, lateral and yaw motions of an electric vehicle is constructed. The nonlinear part is linearized, and the state space model of the control system is derived. The relative slip rate between the two driving wheels of the electric vehicle is used as the input of the electronic differential controller, and the torque coordination percentage of the electric vehicle is used as the output of the electronic differential speed controller.The slip ratio of the drive wheel is controlled, and the electronic differential speed control of the electric vehicle is realized.The simulation model of the electronic differential speed controller and the simulation model of the wheel hub type electric vehicle are built in MATLAB/Simulink.The simulation results are analyzed to determine the factors that affect the robustness and stability of the electronic differential control system of the electric vehicle. The effectiveness of the proposed control strategy is verified. Simulation results show that the proposed method can realize the relative slip rate of the driving wheel is minimum, the driving wheel slip ratio control of the optimal range, and the anti disturbance ability of thesystem is improved.The robust stability of the system is effectively enhanced, improving the driving safety of the vehicle.