Development of a new ABS for passenger cars using dynamic surface control method

In this paper a new Anti-lock Brake System for passenger cars called "Servo ABS" is presented. Servo ABS hydraulic modulator is equipped with servo valves for improving speed, precision and controllability of the system. A developed model for Servo ABS is introduced in this study which contains all of the conventional brake system elements and the ABS hydraulic modulator. Due to the nonlinearities and uncertainties inherent in this system "Dynamic Surface Control method" (DSC) has been employed to control the longitudinal wheels slip. This control method formalizes the concept of multiple surface sliding mode control and the use of synthetic inputs and filters. Several standard maneuvers have been simulated for evaluating Servo ABS performance under different conditions. From the results of simulations under some standard maneuvers, it is confirmed that the performance of the proposed Servo ABS is improved in comparison with conventional ABS. A seven DOF vehicle model and Pacejka tyre model are employed to simulate the vehicle motion on the road surface.