Fault isolation filter design for linear time-invariant systems

Binfan Liu, Jennie Si

Research output: Contribution to journalArticlepeer-review

101 Scopus citations


This paper is concerned with the problem of detecting and isolating multiple faults by a full-order observer of the plant state. We first obtain the fault isolability condition from the dual concept, namely static-state feedback decoupling. A new full-state observer design method is then developed to isolate simultaneous multiple faults. The method can isolate m simultaneous faults with m output measurements (such that the isolability condition is satisfied) under zero initial error of state estimation. Asymptotic fault isolation results can also be obtained using the same observer design if the number of invariant eigenvalues is (n - m), and if they are stable, where n represents the system order, m is the number of faults in the system. In both cases m can be up to the system order n.

Original languageEnglish (US)
Pages (from-to)704-707
Number of pages4
JournalIEEE Transactions on Automatic Control
Issue number5
StatePublished - 1997


  • Fault detection and isolation
  • Full order observer
  • State feedback decoupling

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Computer Science Applications
  • Electrical and Electronic Engineering


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