Fault detection for networked control system with time-delay and data packet dropout

Focusing on the networked control system with network-induced time-delay and transmitted data packet dropout, based on assumptions that the rate of the data packet dropout is fixed and the network-induced time-delay is less than one sampling period, problems of observer-based fault detection of the system are studied. According to conditions of data arrival of the controller, the state observers of the system are designed to detect faults when they occur in the system. When the system is normal, the observer system is modeled as an asynchronous dynamic system with rate constraints on events. Based on the model, stability of the whole system is given. When conditions are satisfied, the system is exponentially stable. When a fault occurs, the observer residual can change rapidly to detect the fault. A numerical example shows the effectiveness of the proposed method.