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An Instrument Fault Detection Scheme using Function Observers  

Lee, Sang-Moon (단국대학교 대학원 전기공학과)
Lee, Kee-Sang (단국대학교 공과대학 전기공학과)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers D / v.55, no.3, 2006 , pp. 91-97 More about this Journal
Abstract
A major difficulty with the practical application of the multiple observer based IFDI schemes is the computational burden of the residual generation. In this paper, a new residual generator that employs function observers is proposed to reduce the computational burden, and the design methods of the IFDIS, equipped with the residual generator, are presented. The function observers employed in the residual generator can be considered as a dual of the unknown input (function) observer And it can be designed to estimate the measurement errors that are due to sensor faults. The error estimates are further processed to generate the residuals by which reliable fault detection/isolation result car be obtained. The proposed scheme is more useful, in real-time application, than any other multiple state observer based IFDISs. It can be effectively applied to fault tolerant control because the failure effects can be compensated by the use of the estimates of measurement errors. The proposed IFDI scheme is applied to an inverted pendulum control system for the IFDI of failed sensor and fault compensation.
Keywords
Instrument Fault Detection; Function Observer; Residual Generation; Fault Tolerant Control;
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