Research on an Improved Hybrid Fault-Tolerant Control Method for NCS Based on DETCS

Abstract

In this paper, the linear networked control system (NCS) with any actuator failures is discussed. The offline design of the fault-tolerant controller under the discrete event triggering communication mechanism (DETCS) and the control problem of online scheduling and compensation are studied. Firstly, according to certain rules, the actuator fault is divided into four sections. By constructing Lyapunov-Krasovskii functional and improved Jesson inequalities, a set of controllers with less conservativeness is designed based on common faults in the interval. Secondly, when the fault detection observer detects the fault, the corresponding interval controller is dispatched through the scheduling mechanism. In case of sudden and rare failure within the interval, the controller in which the fault occurs should be compensated to meet the fault-tolerant control requirements. Finally, a simulation example is given to verify the correctness and effectiveness of the proposed method.