Brief paper: Fault tolerant control using sliding modes with on-line control allocation

Authors:
Halim Alwi;Christopher Edwards
Affiliations:
Control and Instrumentation Research Group, Department of Engineering, University of Leicester, Leicester LE1 7RH, UK;Control and Instrumentation Research Group, Department of Engineering, University of Leicester, Leicester LE1 7RH, UK
Venue:
Automatica (Journal of IFAC)
Year:
2008

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Abstract

This paper proposes an on-line sliding mode control allocation scheme for fault tolerant control. The effectiveness level of the actuators is used by the control allocation scheme to redistribute the control signals to the remaining actuators when a fault or failure occurs. The paper provides an analysis of the sliding mode control allocation scheme and determines the nonlinear gain required to maintain sliding. The on-line sliding mode control allocation scheme shows that faults and even certain total actuator failures can be handled directly without reconfiguring the controller. The simulation results show good performance when tested on different fault and failure scenarios.