Designing a Controller for Anti-lock Brake System

Anti-lock brake system (ABS) becomes popular nowadays as one of the most important automotive technologies for active safety, which have improved passengers and driver security byautomatically adjusting the braking force during braking in potentially dangerous conditions. ABS has been designed toachieve maximum deceleration by preventing the wheels from locking, which minimize braking distance and maintain steerability during braking. Therefore, maximum decelerationcan be achieved by designing a suitable control system for wheel slip regulation at its optimum value. However, thecontrol of anti-lock braking systems is a challenging problem due to nonlinear braking dynamics. In this research, a fuzzy logic controller for wheelslip control has been designed based on a two-axle vehicle model and its brake system model. In contrast to the last researches the proposed brake system model is more completeand like real ABS systems, control signal is applied to solenoid control valves in brake system. So that controller bycontrolling the operations of these valves can regulate brake pressure and produce appropriate brake torque in brakingprocess. Simulation results show the success of fuzzy logic controller in maintaining wheel slip, deceleration, and speeds in their optimum values better than conventional rule based controller of ABS

Keywords:

Anti-lock brake system , slip , modeling , fuzzy logic control