Fault Detection for Networked Control Systems Based on Wireless Sensor Networks

Focusing on a class of networked control systems built around wireless sensor networks (WSN), the controller and the actuator in systems are assumed to be time-driven and the clocks are fully synchronized. The observer based on discrete switched systems is designed to detect faults which occur in the system. Firstly, by studying the transmission characteristics of data with wireless sensor networks, the augmented fault observer is constructed, and the observer is equivalent to the discrete switched system. Secondly, based on Lyapunov stability theory, the stability condition of observer can be viewed as a linear matrix inequality and the stability of system is proved. When the system is normal, if the given inequality condition is satisfied, the observer system is stable. When a fault occurs, the observer can detect the fault by the rapid change of residue. Finally, an illustrative example is given to demonstrate the effectiveness of the proposed method. Copyright © 2013 IFSA.