Research on co-design of dual security control and communication for nonlinear CPS with actuator fault and FDI attacks

In this study, a co-design method of dual security control and communication is investigated for a nonlinear cyber–physical system (CPS) with an actuator fault and false data injection (FDI) attacks. First, under the discrete event trigger communication scheme, considering the different effects of actuator fault and FDI attacks on a double-end network, a dual security control strategy with active fault-tolerance and active–passive attack-tolerance is proposed. It can accommodate an actuator fault, actively compensate an actuator FDI attack, and passively resist a sensor FDI attack, respectively, thereby establishing a new dual security control framework with fault-tolerance and attack-tolerance. Moreover, the Takagi–Sugeno (T-S) fuzzy model for the nonlinear CPS is established under this framework. Second, by constructing an appropriate Lyapunov–Krasovskii functional and introducing the time-delay theory and the affine Bessel–Legendre inequality, lesser conservative design methods of a robust augmented observer for the estimation of the state, FDI attacks, and fault as well as a dual security controller are obtained. Finally, a classical quadruple-tank model is used to show the validity and feasibility of the proposed method.