A new fuzzy logic road detector for antilock braking system application

Antilock braking system (ABS) is capable of stopping a vehicle wheel without locking while decreasing the stopping distance. In this paper, fuzzy logic is applied in two different ways. In the first strategy, a hybrid controller is proposed which is a combination of a sliding mode controller (SMC) with a novel fuzzy controller to improve sliding mode controller efficiency. A Conventional SMC design is improved by using a saturation function in control input to reduce chattering and then it is combined with the new fuzzy controller to increase controller performance by eliminating the time responses oscillation. As a second application, a new fuzzy road detector is designed to detect three different road conditions. Simulations under these selected road conditions are performed to demonstrate the effectiveness of the proposed hybrid controller. Simulation results show good performance of the proposed controller in different road detected states.