Robust fault detection in uncertain nonlinear systems via a second order sliding mode observer

Document Type

Conference Proceeding

Publication Date

12-1-2001

Publication Title

Proceedings of the IEEE Conference on Decision and Control

Volume

1

First Page

573

Last Page

578

Abstract

In this paper, a second order sliding mode observer-based robust fault detection in uncertain nonlinear systems is discussed. First of all, a second order sliding mode observer is presented. The reason why the second order sliding mode observer is used for fault detection is that the second-order S(t) (sliding surface) dynamics can sharply filter unwanted high frequencies due to unmodeled dynamics. The sliding condition is first derived such that the observer switching gain can be selected. The stability of the reduced sliding mode observer is then proved by assuming that the considered nonlinear system has a single output and two outputs, respectively. An example is employed to show that the proposed sliding mode observer can work very effectively.

ISSN

01912216

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