Research on Anti-lock Control Strategy of Automobile with Fuzzy Variable Structure Based on Slip Ratio Identification

Aiming at the chattering problem of conventional exponential approach law variable structure control, a fuzzy variable structure control method using fuzzy control to adjust approach law parameter is proposed adaptively. This method is applied to anti - lock braking system and the controller based on slip ratio is designed. On this basis, the identification algorithm of target slip ratio is studied, and the recursive least square method of self-adjusting forgetting factor is applied to realize the identification of the best slip ratio based on Kiencke $\mu$-S model. On the basis of theoretical analysis, relevant simulation models are established by using MATLAB Simulink and fuzzy toolbox to verify the effectiveness of fuzzy variable structure control strategy and optimal slip ratio identification algorithm, and the simulation results of single road surface and saltation road surface are given. The results show that the fuzzy variable structure controller designed can reduce chattering effectively and maintain robustness and fast response of conventional variable structure control. This method is effective in combination with the identification algorithm of optimal slip ratio.