Abstract:

Considering the limitation by steering control to improve vehicle stability when the lateral tire force is saturated, a new stability control strategy was proposed to further increasing the margin of steering yaw moment of vehicle based on the synergy of rear-wheel active steering and unilateral-wheel differential braking.
An active steering optimum controller of the rear-wheels and a stability fuzzy controller were designed, and the coordination scheme between them was introduced to distinguish each control tasks by using membership function of fuzzy control. The results show that the control system designed for vehicle stability can effectively avoid the occurrence of instability under dangerous conditions, its control effect is better than independent active steering control. 

Key words: vehicle safety, vehicle stability, active steering, differential braking, collaborative control, dynamics simulation