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Theses

Diagnostic robuste des systèmes incertains. Application à un système mécatronique pour l'automobile.

Abstract : Fault detection is a very wide field of research. Model-based approaches have received particular attention. Sometimes model uncertainties create deviations affecting the fault detection. Several methods have emerged to overcome this problem. The active approach tries to decouple the uncertainties to create residuals sensitive to faults while the passive approach propagates the uncertainties to create enclosures containing all trajectories. In this dissertation, the passive approach has been favored and we have investigated the guaranteed state observer also known as "Set-Valued Observer". This observer is of particular interest to manage the wrapping effect caused by model uncertainties. The studied application in this dissertation is a throttle valve whose model is nonlinear. We have used the multiple model approach allowing us to model the throttle valve by several linear models that switch, and this to avoid the conservatism due to nonlinearities. The advantage of this approach is to use directly the interval analysis without degrading the robustness of the diagnosis method. Furthermore, some sensors are not available on the throttle valve; consequently, the state reconstruction, based on analytical redundancies of the model, is necessary. We have proposed a Set-Valued Luenberger Observer to combine the robustness of set-membership methods and the power of the analytical redundancies for reconstruction of missing sensors. This robust observer combined with multiple model approach allowed us to design a robust fault detection method dedicated to the throttle valve and to many other systems.
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https://tel.archives-ouvertes.fr/tel-00747981
Contributor : Clément Letellier <>
Submitted on : Saturday, November 3, 2012 - 9:38:56 AM
Last modification on : Tuesday, July 23, 2019 - 3:23:57 PM
Long-term archiving on: : Monday, February 4, 2013 - 3:41:24 AM

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  • HAL Id : tel-00747981, version 1

Citation

Clément Letellier. Diagnostic robuste des systèmes incertains. Application à un système mécatronique pour l'automobile.. Automatique. Université de Rouen, 2012. Français. ⟨tel-00747981⟩

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