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Journal of Control Science and Engineering
Volume 2008, Article ID 723292, 7 pages
http://dx.doi.org/10.1155/2008/723292
Research Article

Actuator Fault Diagnosis with Robustness to Sensor Distortion

INRIA-IRISA, Campus de Beaulieu, Rennes Cedex 35042, France

Received 1 April 2007; Revised 15 August 2007; Accepted 11 November 2007

Academic Editor: Jakob Stoustrup

Copyright © 2008 Qinghua Zhang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Actuator fault diagnosis is often studied under strong assumptions on available sensors. Typically, it is assumed that the sensors are either fault free or sufficiently redundant. The purpose of this paper is to present a new method for actuator fault diagnosis which is robust to sensor distortion. It does not require sensor redundancy to compensate sensor distortion. The essential assumption is that sensor distortions are strictly monotonous. Despite the nonlinear and unknown nature of distortions, such sensors still provide useful information for fault diagnosis. The robustness of the presented diagnosis method is analyzed, as well as its ability to detect actuator faults. A numerical example is provided to illustrate its efficiency.