Sliding mode observers for detection and reconstruction of sensor faults

• Published in: Automatica (Oxford) Vol. 38; no. 10; pp. 1815 - 1821
• Main Authors: Tan, Chee Pin, Edwards, Christopher
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.10.2002; Elsevier
• Subjects: Applied sciences; Computer science; control theory; systems; Control system analysis; Control theory. Systems; Exact sciences and technology; Fault detection and isolation; Fault reconstruction; Linear matrix inequalities; Observer; Sliding mode; Fault detection and isolation; Fault reconstruction; Linear matrix inequalities; Sliding mode; Observer; Variable structure system; Measurement sensor; Chemical processing; System identification; Measurement error; Actuator; Defect detection
• ISSN: 0005-1098; 1873-2836
• DOI: 10.1016/S0005-1098(02)00098-5

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.