Abstract:

In this paper fault detection is addressed for networked control systems subject to random packet dropout in both sensor-to-controller link and controller-to-actuator link. First a new model of NCS is proposed, which directly eliminates influence of packet dropout in the sensor-to-controller link. Then adaptive threshold is given to ensure robustness to packet dropout in the controller-to-actuator link. False alarm rate analysis is also given, which is not addressed in most of the literature on fault detection of networked control systems. The fault detection scheme can ensure both robustness to packet dropout as well as disturbance and sensitivity to fault, which is superior to the existing approaches. Moreover, the residual generation can be achieved by using linear matrix inequality based convex optimization technique. Comparison with existing approaches illustrates advantages of our method.