Memory event-triggered mechanism based switching-like control for CPSs under DoS attack

In this article, a memory event-triggered mechanism (METM) based switching-like control method is designed for a cyber-physical system (CPS), maintain control performance and improve the communication efficiency under denial of service (DoS) attack. In order to obtain better control effect at small sampling periods, a sampler contains the explicit sampling period is designed by using delta operator approach. First of all, a METM based on an acknowledgement character (ACK) mechanism is proposed, which can reduce event triggered data calculations, increase the transmission instants at the crest or trough of the responses and reduce the negative impact of DoS attack. Next, a switching-like control strategy for the delta operator system converted from the CPS is designed to prevent DoS attack resulting in open-loop unstable operation of the system. Further, a switching law is designed to maintain the concealment of the secure channel. Then, sufficient conditions are derived for the CPS in terms of linear matrix inequalities (LMIs). Finally, the effectiveness of the designed method is verified by a simulation example.