Active fault tolerant / intrusion tolerant cooperative control of discrete NCS based on sliding mode variable structure

Abstract

Aiming at the actuator failure in the linear discrete networked control system (NCS) and the denial of service network attack (DoS) on the actuator side, under the discrete event trigger mechanism, an active fault-tolerant/intrusion-tolerant cooperative control method based on sliding mode variable structure is proposed. This method applies the fading adaptive Kalman filter (AKF) to jointly estimate the system state, fault parameters and attack parameters, obtains the estimated value of each parameter vector, and uses the estimated value satisfying the event trigger condition to reconstruct the controller. In this way, system errors caused by actuator faults and attacks are corrected, fault-tolerant and intrusion-tolerant coordinated control is realized, and the purpose of saving network resources can be achieved. Finally, the effectiveness of the control method is verified by simulation.