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

Fault Detection of Networked Control Systems Based on Sliding Mode Observer

This paper is concerned with the network-based fault detection problem for a class of nonlinear discrete-time networked control systems with multiple communication delays and bounded disturbances. First, a sliding mode based nonlinear discrete observer is proposed. Then the sufficient conditions of sliding motion asymptotical stability are derived by means of the linear matrix inequality (LMI) approach on a designed surface. Then a discrete-time sliding-mode fault observer is designed that is capable of guaranteeing the discrete-time sliding-mode reaching condition of the specified sliding surface. Finally, an illustrative example is provided to show the usefulness and effectiveness of the proposed design method