Research On Electric Vehicle Torque Control Method Based On Terminal Sliding Mode

The concept of energy saving, security, environmental protection is the important content in the sustainable development of car. There is no denying the fact that the electric car is of the biggest development potential in all kinds of the new energy vehicles. With the constant development of the car, the social problems are increasingly prominent at the same time, and the safety must be the first subject that would be focused on. In this paper,a comprehensive analysis and research of the system is carried out based on the domestic and foreign research achievements in the field of automobile yawing stability control.With the basis of distributed driving electric vehicle, the robust control strategy of vehicle stability is proposed in this paper in order to improve the the vehicle’s driving stability. And then the whole vehicle model, which contains two-degree-of-freedom vehicle model, H.B.Pacejka tire model and motor model and so on, is established in the MATLAB/Simulink environment with the basis of the vehicle dynamic structure and the related data collected through sensors.By the analysis of vehicle state and stability, side slip angle and yaw rate are chosen as the two important parameters to measure the stability of the vehicle. Based on this, the original controller using sliding mode control algorithm can be improved by choosing the errors of the actual value and the predicted value as the input base on the RBF adaptive terminal control theory, then Then the external interference terms would be introduced to the state equation, with self-adaptive identification to uncertain items by using RBF neural network, it makes the uncertain items bounded.then,let the linear state of two-degree-freedom vehicle model output value as the control target, decision to keep the vehicle stability additional direct yaw moment, then based on quadratic programming method to get the demand of torque distribution, realize the vehicle driving stability.Finally in this paper, the In-loop Simulation platform of pure electric vehicle stability control system is developed in the MATLAB/Simulink environment, which based on the basis of ve DYNA simulation. With the simulation comparison between the sliding mode variable structure control strategy and RBF adaptive terminal sliding mode,it proves that the two kinds of control strategies proposed in this paper are of effectiveness,and the second one is of better performance. two kinds of control strategies are, the control effect is better. At the same time, the in-loop simulation platform for the vehicle control system simulation experiment based on Matlab/Simulink can avoid the waste of too much time and cost caused in the process of real vehicle test.