This paper studies an adaptive event-triggered security control for networked control systems (NCSs) under aperiodic denial of service (DoS) attacks and false data injection (FDI) attacks. A state-FDI attack observer is designed to estimate the unmeasurable system state and unknown FDI attacks simultaneously. An adaptive event-triggered scheme (AETS) is proposed to conserve network resources while eliminating the impacts of DoS attacks, where the event-triggering (ET) parameter is adjusted according to the average value and the rate of change of neighboring state estimation errors. Based on the AETS, a security control strategy is designed to compensate for FDI attacks actively. Meanwhile, the entire closed-loop switched system is constructed under DoS and FDI hybrid attacks. Using the Lyapunov–Krasovskii function, the exponential stability conditions of NCSs with are obtained. Furthermore, the gain matrices of the observer, the ET parameter of the AETS, and the gain matrices of the active compensation controller are co-designed. Finally, the proposed scheme is verified by a numerical example and practical experiment on a brushless direct current motor NCS. The proposed scheme can not only defend hybrid DoS and FDI attacks in NCSs but also effectively relieve network congestion and improve communication efficiency.
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