Event-Triggered Fault Detection and Control in Generalized Internal Model Control Framework

The paper investigates the design of event-triggered fault detection and control in the framework of Generalized Internal Model Control (GIMC). Inspired by the GIMC structure, an observer-based feedback control structure with a fault detection unit is firstly proposed, where the event-triggered technology is also employed to reduce the communication consumption between the monitored plant and the observer. Then, since the separation principle is destroyed by the use of the event-triggered technology, the augmented system approach is used to design the observer-based controller. Further, a robust post-filter is designed, under the H-/H∞performance index, to guarantee that the residual (fault indicating) signal satisfies the optimized robustness against disturbances under the desired sensitivity to faults. Finally, a three-tank system is adopted to verify the effectiveness and superiority of the proposed scheme.