Brief Sliding mode observers for detection and reconstruction of sensor faults

Authors:
Chee Pin Tan;Christopher Edwards
Affiliations:
Control and Instrumentation Group, Department of Engineering, University of Leicester, Leicester, LE1 7RH, UK;Control and Instrumentation Group, Department of Engineering, University of Leicester, Leicester, LE1 7RH, UK
Venue:
Automatica (Journal of IFAC)
Year:
2002

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Abstract

This paper proposes two methods for detecting and reconstructing sensor faults using sliding mode observers. In both methods, fictitious systems are introduced in which the original sensor fault appears as an actuator fault. The original sensor faults are then reconstructed using a 'secondary' sliding mode observer. For both methods, there are certain conditions which must be satisfied for successful fault detection and reconstruction. The methods are demonstrated using a chemical process example.