Event-Triggered Fault Detection for Networked Control Systems with Time-Varying Delays Based on Delta Operator

摘要

This paper studies event-triggered fault detection filter (FDF) and controller coordinated design for delta-operator-formulated Networked Control Systems (NCS) with high-speed sampling. By considering event-triggered scheme and time-varying network-induced delays, a networked residual system based on delta operator is established. Event-triggered asymptotic stability conditions and H∞ performance analysis of the constructed system are presented by using the Lyapunov-Krasovskii functional approach in delta-domain. A sufficient condition for the solvability of FDF and controller is derived in terms of linear matrix inequalities. The desired FDF and controller can maximize the sensitivity of the residual signal to the fault signal and guarantee the robustness of the networked system to external disturbances. Finally, a numerical example is provided to demonstrate the efficacy of the proposed method.