关键词: 网络控制系统, 故障检测, 输出时延, 采样周期, Networked Control System (NCS), output delay, sampling period

Abstract: Considering a class of network control system with time delays, the fault detection was carried out when the output delays were present. By increasing sampling frequency in controller and equally dividing the sampling period of the sensor, the time delays could be approximated to several times of the sampling period of the controller. On this basis, the error equation of the fault observer was constructed based on a discrete asynchronous dynamical system. And a linear matrix inequality decided the stability condition of this observer. When the system is normal and the given inequality condition is satisfied, the observer system is stable. When a fault is present, the observer residue can change rapidly and the occurrence of the fault can be detected. Finally, an illustrative example was given to demonstrate the effectiveness of the proposed method.

Key words: fault detection