This paper is concerned with actuator fault detection in nonlinear systems in the presence of disturbances. A nonlinear unknown input observer is designed and the output estimation error is used as a residual for fault detection. To deal with the problem of high Lipschitz constants, a modified mean-value theorem is used to express the nonlinear error dynamics as a convex combination of known matrices with time-varying coefficients. Moreover, the disturbance attenuation is performed using a modified criterion. A sufficient condition for the existence of an unknown input observer is obtained using a linear matrix inequality formula, and the observer gains are obtained by solving the corresponding set of inequalities. The advantages of the proposed method are that no a priori assumption on the unknown input is required and that it can be applied to a large class of nonlinear systems. Performances of the proposed approach are shown through the application to a diesel engine model.
@article{bwmeta1.element.bwnjournal-article-amcv23z3p557bwm, author = {Boulaid Boulkroune and Issam Djemili and Abdel Aitouche and Vincent Cocquempot}, title = {Robust nonlinear observer design for actuator fault detection in diesel engines}, journal = {International Journal of Applied Mathematics and Computer Science}, volume = {23}, year = {2013}, pages = {557-569}, zbl = {1279.93025}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-amcv23z3p557bwm} }
Boulaid Boulkroune; Issam Djemili; Abdel Aitouche; Vincent Cocquempot. Robust nonlinear observer design for actuator fault detection in diesel engines. International Journal of Applied Mathematics and Computer Science, Tome 23 (2013) pp. 557-569. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-amcv23z3p557bwm/
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