Mixed H∞ and Fuzzy Logic Controllers for the Automobile ABS

A mixed of two different control strategies are proposed for stability and performance enhancement of the vehicle Antilock Braking Systems (ABS). The first is based on the H _∞ control theory in order to devise a robust control methodology for stabilizing the system under various road conditions. The second is based on the Fuzzy Logic concept for performance enhancement of the aforementioned system. The results of the mixed controllers are compared to the ideal condition for which access to the maximum tire-road coefficient of friction is available.