Design of linear unknown input observers for sensor fault estimation in nonlinear systems

A systematic method for the design of linear unknown input observers (UIO) for sensor fault estimation in nonlinear systems is developed. Necessary and sufficient conditions for the existence of linear UIOs for nonlinear systems are derived. As long as these conditions are satisfied, we obtain expli...

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Bibliographic Details
Published inAutomatica (Oxford) Vol. 155; p. 111152
Main Authors Venkateswaran, Sunjeev, Kravaris, Costas
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.09.2023
Subjects
Chemical reactors
Fault diagnosis
Fault estimation
Observers
Sensor faults
Fault diagnosis
Observers
Fault estimation
Chemical reactors
Sensor faults
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ISSN0005-1098
1873-2836
DOI10.1016/j.automatica.2023.111152

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Summary:A systematic method for the design of linear unknown input observers (UIO) for sensor fault estimation in nonlinear systems is developed. Necessary and sufficient conditions for the existence of linear UIOs for nonlinear systems are derived. As long as these conditions are satisfied, we obtain explicit design formulas for the observer. The method is applied to a non-isothermal chemical reactor (CSTR) subject to a concentration sensor fault.
ISSN:0005-1098
1873-2836
DOI:10.1016/j.automatica.2023.111152