Active fault diagnosis by controller modification

Jakob Stoustrup, Hans Henrik Niemann

    Research output: Contribution to journalJournal articleResearchpeer-review


    Two active fault diagnosis methods for additive or parametric faults are proposed. Both methods are based on controller reconfiguration rather than on requiring an exogenous excitation signal, as it is otherwise common in active fault diagnosis. For the first method, it is assumed that the system considered is controlled by an observer-based controller. The method is then based on a number of alternate observers, each designed to be sensitive to one or more additive faults. Periodically, the observer part of the controller is changed into the sequence of fault sensitive observers. This is done in a way that guarantees the continuity of transition and global stability using a recent result on observer parameterization. An illustrative example inspired by a field study of a drag racing vehicle is given. For the second method, an active fault diagnosis method for parametric faults is proposed. The method periodically adds a term to the controller that for a short period of time renders the system unstable if a fault has occurred, which facilitates rapid fault detection. An illustrative example is given.
    Original languageEnglish
    JournalInternational Journal of Systems Science
    Issue number8
    Pages (from-to)925 - 936
    Publication statusPublished - 2010


    • Active fault detection


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