A New Approach to Traction Control of EV Without Velocity Sensors

This paper presents a new control algorithm that prevents electrical vehicle from wheel skidding in presence of uncertainties of tire-road condition. An estimator of the maximum effective torque is realized by wheel velocity and input torque, which is based on a pure kinematic relationship between the wheel and the chassis. In order to enhance the stability of the control system and handing performance of the driver, a half-closed loop controller makes use of the estimator to limit the maximum torque output to wheel, whose results to date indicate that it is an effective approach to prevent slip.