Unified Analysis of Diagnosis Methods for Process Monitoring

Carlos F. ALCALA*, S. Joe QIN

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

18 Citations (Scopus)


Several diagnosis methods have been proposed for statistical process monitoring. They have been developed from different backgrounds and considerations. In this paper, five existing diagnosis methods are analyzed and compared. It is shown that these methods can be unified into three more general methods, making the original diagnosis methods special cases of the general methods. An analysis of the diagnosability of the general methods shows that some diagnosis methods guarantee correct diagnosis for simple sensor faults with large magnitudes, while others do not. For the case of sensor faults with modest fault magnitudes, a Monte Carlo simulation is used to compare the performance of the diagnosis methods. © 2009 IFAC.
Original languageEnglish
Pages (from-to)1007-1012
Number of pages6
JournalIFAC Proceedings Volumes
Issue number8
Publication statusPublished - Jun 2009
Externally publishedYes
Event7th IFAC Symposium onFault Detection, Supervision and Safety of Technical Processes (SAFEPROCESS'09) - Barcelona, Spain
Duration: 30 Jun 20093 Jul 2009

Bibliographical note

ISBN: 9783902661463 <br/>We gratefully acknowledge the financial support given to this work by the Roberto Rocca Education Program and the Texas-Wisconsin-California Control Consortium.


  • Contribution analysis
  • Diagnosability
  • Fault diagnosis
  • Process monitoring


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