A design framework for event-triggered active fault-tolerant control systems

This article proposes a design framework for an event-triggered active fault-tolerant control system. The considered control system is modelled with an injected actuator fault into the plant system, and it includes: (i) two event detectors to determine when information is to be sampled or updated, (ii) a fault diagnosis observer to provide the fault and state information, and (iii) a fault-tolerant controller to compensate the fault. The proposed design framework allows for the separation of the designs of the fault diagnosis observer and the fault-tolerant controller, to mitigate the coupling effect caused by the event-triggered mechanisms and avoid the computations of a higher order system. Also, a design procedure is presented to deliver the computation of the design variables to reduce the information transfer, in both centralised and decentralised cases. Finally, a batch reactor benchmark system is adopted to demonstrate the applicability and superiority of the proposed design framework.