Fault detection for wireless network control system based on sliding mode observer

This paper considers the fault detection problem of wireless network control system with time delay and uncertainties. For a class of model which has bounded disturbance and unknown fault, a sliding mode observer is designed for the situation that all the states of the system can be measured and no missing measurement occurs. We convert the design of fault detection observer to the design of reaching motion and sliding motion, by the use of Lyapunov function, a sufficient condition for sliding motion with time delay independent and uncertainties is acquired through linear matrix inequality, while the nonlinear item in observer is also designed. Finally, the effectiveness of proposed method is demonstrated by simulation results. © 2013 IFSA.