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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.

Nonlinear control for a diesel engine: a CLF-based approach

100%

Kuzmych O., Aitouche A., El Hajjaji A., Bosche J.

International Journal of Applied Mathematics and Computer Science

2014

tom 24

nr 4

821-835

In this paper, we propose a control Lyapunov function based on a nonlinear controller for a turbocharged diesel engine. A model-based approach is used which predicts the experimentally observed engine performance for a biodiesel. The basic idea is to develop an inverse optimal control and to employ a Lyapunov function in order to achieve good performances. The obtained controller gain guarantees the global convergence of the system and regulates the flows for the variable geometry turbocharger as well as exhaust gas recirculation systems in order to minimize the N Ox emission and the smoke of a biodiesel engine. Simulation of the control performances based on professional software and experimental results show the effectiveness of this approach.

Ograniczanie wyników

2 International Journal of Applied Mathematics and Computer Science

2 Aitouche A.

1 Bosche J.

1 Boulkroune B.

1 Cocquempot V.

1 Djemili I.

1 El Hajjaji A.

1 Kuzmych O.

1 2014

1 2013

Wyniki wyszukiwania

Robust nonlinear observer design for actuator fault detection in diesel engines

Nonlinear control for a diesel engine: a CLF-based approach