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Novel traction control of electric vehicle based on single wheel dynamics

It is hard for traction control to ensure the stability of vehicles because of the non-linearity, uncertainty and parameters variation of vehicle dynamics. A novel traction control model is presented in this study to obtain the optimal traction performance by taking the advantage of fast torque response of electric vehicles (EVs) and dealing with driver operation properly. A new judgement unit is designed to combine the optimal slip ratio controller with driver operation, and the driver's input is kept when the slip ratio exceeds the reference value. Further, an engineering design method of the slip ratio controller is researched in terms of speed range and different work conditions. Two sets of controller parameters are designed since the vehicle time constant varies with wheel speed. The possibility of taking fix controller parameters value in one speed range is analysed and verified. Moreover, the stability of system and the influence of sampling frequency on system are analysed. Finally, the validity of the proposed control methodology is fully verified with simulation and experiments on the tire–road simulation test bench which adopts the asynchronous motor mechanical properties to simulate tire–road characteristics.