Abstract:

An electronic stability program (ESP) and an active front steering (AFS) active tire force fuzzy coordination control strategy were proposed based on sideslip angle logic gate and yaw rate tracking. The control system adopted a hierarchical structure. The designed lower layer consisted of a single neuron adaptive
proportion integration differentiation (PID) controller for the ESP and an ideal variable ratio feedforward with yaw rate feedback sliding mode controller for the AFS. The weight fuzzy coordinated control of each subsystem was decided to decoupling of vehicle dynamics integrated control system and global optimal allocation of the ESP and the AFS under different driving conditions in the upper layer of control system. The vehicle dynamics stability co-simulation model was established on the base of software ADMAS/Car and Simulink. The results show that the coordinate controller improves the vehicle tracking performance for the desired path and the global robustness of vehicle stability control system, compared with controller of the single control and the coexist control.

Key words: vehicle stability, electronic stability program (ESP), active front steering (AFS), active tire force, fuzzy control, coordinated control