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Journal of Control Science and Engineering
Volume 2008, Article ID 853275, 15 pages
http://dx.doi.org/10.1155/2008/853275
Research Article

Fault Detection, Isolation, and Accommodation for LTI Systems Based on GIMC Structure

1Facultad de Ciencias, Zona Universitaria, Universidad Autonoma de San Luis Potosí, San Luis Potosí, SLP 78290, Mexico
2Facultad de Ingeniería, Universidad Autonoma de San Luis Potosí, Av. Dr. Manuel Nava 8, Zona Universitaria, SLP 78290 C.P., Mexico

Received 31 December 2006; Revised 28 July 2007; Accepted 13 November 2007

Academic Editor: Kemin Zhou

Copyright © 2008 D. U. Campos-Delgado et al. 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

In this contribution, an active fault-tolerant scheme that achieves fault detection, isolation, and accommodation is developed for LTI systems. Faults and perturbations are considered as additive signals that modify the state or output equations. The accommodation scheme is based on the generalized internal model control architecture recently proposed for fault-tolerant control. In order to improve the performance after a fault, the compensation is considered in two steps according with a fault detection and isolation algorithm. After a fault scenario is detected, a general fault compensator is activated. Finally, once the fault is isolated, a specific compensator is introduced. In this setup, multiple faults could be treated simultaneously since their effect is additive. Design strategies for a nominal condition and under model uncertainty are presented in the paper. In addition, performance indices are also introduced to evaluate the resulting fault-tolerant scheme for detection, isolation, and accommodation. Hard thresholds are suggested for detection and isolation purposes, meanwhile, adaptive ones are considered under model uncertainty to reduce the conservativeness. A complete simulation evaluation is carried out for a DC motor setup.