Super Twisting Algorithm Based Slip Ratio Control of Electric Vehicles

摘要

Safety of a passanger is an important feature that is considered much during the design of an electric vehicle (EV). A perfect traction control technique is essential to acheive this goal. Wheel slip ratio control method is widely accepted in stability control area of EV. Recently different sliding mode algorithms are used for the slip ratio control, among them super twisting control (STC) is proved to be one of the efficient method. For STC the estimation of wheel slip ratio is obtained by different nonlinear observers. In this work for the estimation of slip ratio from vehicle and wheel velocities a super twisting observer (STO) is proposed. Efficiency of the super twisting observer/controller system is validated in MATLAB/simulink model. A performance comparison is made with first order sliding mode observer/STC system. Results confirms the advancement of STO/STC system in speed of response, acccuracy and chattering reduction.