Research on Vehicle Active Steering Control Based on Steering-by-wire System

Keqi Zhang

College of Mechanical and Vehicle Engineering, Chongqing Jiaotong University, Chongqing, 400074, China

Abstract: Based on the CarSim/MATLAB co-simulation, an improved vehicle model was established using a steer-by-wire steering dynamics model instead of the steering system of the CarSim original vehicle model. Based on the advantage that the angle-to-gear ratio of the steer-by-wire steering system can be freely designed, the ideal angle-varying transmission ratio of the steer-by-wire steering system is designed based on the constant yaw rate gain. Aiming at the nonlinear characteristics of the vehicle steering system, the active steering controller of the steer-by-wire system was designed using fuzzy control theory. Finally, using the improved vehicle, the controller was simulated and analyzed. The results show that the active steering controller designed by the fuzzy control theory improves the vehicle's steering stability.

Keywords: Steer-by-wire; Variable angle gear ratio; Fuzzy control; Steering stability