Fault Detection and Isolation of Anti-lock Braking System Sensors

Anti-lock Braking System (ABS) can be controlled by wheel slip regulation control method. Two output measured variables are usually considered for slip regulation: wheel speed (wheel's angular speed) and vehicle velocity. Accurate slip calculation is a key to control the ABS system. Since wheel slip control loop is utilized, the faultless operation of this control loop is strictly required. For this purpose, effective sensor fault detection and isolation of ABS has to be developed. In this paper, sensor fault detection and isolation is designed for ABS. Sensor faults detection and isolation for a class of nonlinear systems is proposed. To isolate and estimate the possible sensor faults a bank of Sliding Mode Observer (SMO) is designed. Also it can provide a method to estimate the faults. The sensor fault isolation method is tested on ABS, and simulation results show that it can isolate various types of sensor faults effectively.