Event-Triggered Protocol-Based Control for Cyber–Physical Systems Vulnerable to Dual-Channel DoS Attacks

This article proposes a dynamic event-triggered protocol (ETP)-based controller for a quadruple-tank model to defend against dual-channel denial-of-service (DoS) attacks. Such an attack may inflict serious damage on two communication channels: the sampler-to-controller (STC) and controller-to-actuator (CTA) channels. To reduce bandwidth occupation and energy consumption, a dynamic ETP (DETP) is introduced in the control scheme, which shows resilience against dual-channel attacks. Based on the proposed protocol, a resilient controller with three formulations in view of the occurrences of attacks is codesigned by using triggered data to mitigate the dual-channel DoS attacks and ensure good response characteristics. The designed controller can be proven to make the resultant closed-loop system robustly and asymptotically stable, respectively, by using a piecewise Lyapunov functional method. Simulation results have verified the effectiveness of the proposed control strategy.