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Robust nonlinear observer design for actuator fault detection in diesel engines

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Boulkroune B., Djemili I., Aitouche A., Cocquempot V.

International Journal of Applied Mathematics and Computer Science

2013

tom 23

nr 3

557-569

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 $H_∞$ 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.

Ograniczanie wyników

1 International Journal of Applied Mathematics and Computer Science

1 Aitouche A.

1 Boulkroune B.

1 Cocquempot V.

1 Djemili I.

1 2013

Wyniki wyszukiwania

Robust nonlinear observer design for actuator fault detection in diesel engines