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Unknown input observer for state affine systems: A necessary and sufficient condition |
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| Authors: | Hassan Hammouri [Author Vitae] Zied Tmar [Author Vitae] |
| Affiliation: | a Université de Lyon, F-69003, France b Université Lyon 1, CNRS UMR 5007 LAGEP (Laboratory of Process Control and Chemical Engineering), 43 bd du 11 novembre, 69100 Villeurbanne, France c Université de Tunis, Univrsité 7 Novembre à Carthage, Tunisia d LECAP (Study Laboratory of Automatic Process Control), Ecole Polytechnique de Tunisie, BP743, 2078 La Marsa, Tunisia |
| Abstract: | The problem of designing an unknown input observer for linear systems and its application to fault detection is widely studied in the literature. For nonlinear systems, only subclasses of nonlinear systems and sufficient conditions have been stated. In this paper an unknown input observer design for state affine systems is considered. Based on the geometric approach, a necessary and sufficient condition is given for the existence of an unknown input observer. |
| Keywords: | Nonlinear systems Unknown input observer State affine models |
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