A new approach to traction control of EV based on maximum effective torque estimation

This paper presents a new control algorithm that prevents wheel skidding of electric vehicles in the presence of uncertainties in tire-road conditions. An estimator of the maximum effective torque is realized by wheel velocity and input torque, which is based on a purely kinematic relationship between the wheel and the chassis. In order to enhance the stability of the control system and preserve handling performance for the driver, a half-closed loop controller makes use of the estimated result to restrain the maximum torque output to the wheels. Simulation and experimental results indicate that this is an effective and practical approach to prevent slip.