Integrated fault-tolerant control methodology for non-linear dynamical networked control systems subject to time-varying delay

• Published in: IET control theory & applications Vol. 8; no. 8; pp. 535 - 545
• Main Authors: Wu, Wei, Fang, Huajing
• Format: Journal Article
• Language: English
• Published: Stevenage The Institution of Engineering and Technology 01.05.2014; John Wiley & Sons, Inc
• Subjects: control system synthesis; Control systems; Delay; delays; Fault detection; fault detection estimator; Fault diagnosis; fault diagnosis scheme; fault isolation; Fault tolerance; Faults; FTC methodology; integrated fault‐tolerant control methodology; isolation module; networked control systems; network‐induced delay; nominal controller; nonlinear control systems; nonlinear dynamical networked control systems; nonlinear dynamical systems; Nonlinearity; residual generation; stability; system uncertainty; time‐varying delay; time‐varying systems; uncertain systems; Uncertainty; time-varying systems; time-varying delay; fault tolerance; uncertain systems; nonlinear dynamical networked control systems; integrated fault-tolerant control methodology; control system synthesis; nominal controller; fault isolation; nonlinear dynamical systems; fault diagnosis scheme; delays; nonlinear control systems; network-induced delay; isolation module; networked control systems; FTC methodology; residual generation; system uncertainty; fault detection estimator; stability
• ISSN: 1751-8644; 1751-8652
• DOI: 10.1049/iet-cta.2013.0488

This study deals with the problem of designing an integrated fault-tolerant control (FTC) methodology for non-linear dynamical networked control systems subject to time-varying delay. For the convenience of residual generation, influence caused by network-induced delay is transformed into time-varying uncertainty, which facilitates further manipulation. A fault diagnosis scheme is utilised for fault detection and isolation. On the basis of the uncertainty and fault information obtained by the fault diagnosis procedure, an FTC component is developed to compensate for the effects of uncertainty and fault. In the absence of fault, a nominal controller is employed to deal with the system uncertainty. After fault detection estimator is activated, the controller is reconfigured to guarantee the boundedness of all the system signals until the fault is isolated. After the fault is isolated, the controller is reconfigured to improve the control performance by using the fault information generated by the isolation module. In addition, the stability of the proposed scheme is rigorously investigated. Finally, a simulation example is utilised to illustrate the performance of the proposed scheme.