On-line fault detection in adaptive control systems by using Kullback Discrimination Index

K. Kumamaru, T. Soderstrom, S. Sagara, K. Morita

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


An on-line scheme to fault detection in adaptive control systems is proposed by introducing Kullback Discrimination Information (KDI) as a detection index. When a physical parameter change due to a failure has occurred in a system under adaptive control, the failure effect will hardly be visible in the output performance because of the adaptation mechanism. Such a parameter change is also difficult to detect by monitoring the regulator parameters, which are determined by a recursive identification based on the direct approach. Since the failure effect is reflected as a change in the predictor model used for the adaptive control design, the fault detection leads to a model discrimination problem. It has been shown that the KDI can be used as an effective distortion measure for the model discrimination and the index can be applied in a modified form to detect a fault on-line. Simulation studies on a second order damped oscillatory system have been carried out to demonstrate the efficiency of the method.

Original languageEnglish
Pages (from-to)1135-1140
Number of pages6
JournalIFAC Proceedings Series
Issue number8
Publication statusPublished - 1989
Externally publishedYes
EventEighth IFAC/IFORS Symposium on Identification and System Parameter Estimation 1988. Part 1 - Beijing, China
Duration: Aug 27 1988Aug 31 1988

All Science Journal Classification (ASJC) codes

  • General Engineering


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