Résumé: Driving stability is effected by driven wheel slip, which can be controlled by driven wheel torque. In a vehicle powered by an internal combustion engine, torque can be controlled by an engine management system. The sliding mode algorithm is the mechanism behind the design of the traction control system (TCS). The longitudinal slip is controlled by the position of the throttle valve. The vehicle model used has seven degrees of freedom and a two-state engine model, i.e., the mass of air in the intake manifold and the engine speed. Time-delay transport is considered in the engine model used. A nonlinear tire model for combined slip is used for tire force computation. Because of the nonlinear dynamic of the tire, vehicle, and engine, the control method of sliding mode is used for its robustness. A controller is designed based on dynamic surface control, for which two first-order surfaces are defined. The effectiveness of the controller will be demonstrated with simulation results for different maneuvers (dry and slippery road condition, split road condition). Results show that for different road conditions, the acceleration performance, directional stability, and steerability of a vehicle equipped with TCS is improved. The reason is that the slip is controlled by keeping it in a desired range.

Langue: Anglais