Hybrid Active-passive Robust Fault-Tolerant Control for a Networked Control System Based on an Event-triggered Scheme

We address a hybrid active-passive robust fault-tolerant control design method for a networked control system (NCS) based on a discrete event-triggered communication scheme (DETCS). Aimed at an uncertain linear NCS with time-varying delays influenced by an external disturbance with limited energy, we propose robust passive and normal controllers based on the DETCS. The normal controllers ensure that the system has good dynamic performance while the system operates normally. When faults occur by switching to the passive robust fault-tolerant controller through a switching function, the system not only keeps steady but also has certain disturbance performance restrictions. In addition, it can also slow the decreasing speed of system performance during early periods of unknown faults. We also use the robust fault diagnosis observer to detect faults in real time and find that adaptive compensation control can eliminate the effect of any unknown fault. Finally, a simulation example is used to justify the feasibility of the proposed approach.