Controller modification applied for active fault detection

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This paper is focusing on active fault detection (AFD) for parametric faults in closed-loop systems. This auxiliary input applied for the fault detection will also disturb the external output and consequently reduce the performance of the controller. Therefore, only small auxiliary inputs are used with the result that the detection and isolation time can be long. In this paper it will be shown, that this problem can be handled by using a modification of the feedback controller. By applying the YJBK-parameterization (after Youla, Jabr, Bongiorno and Kucera) for the controller, it is possible to modify the feedback controller with a minor effect on the external output in the fault free case. Further, in the faulty case, the signature of the auxiliary input can be optimized. This is obtained by using a band-pass filter for the YJBK parameter that is only effective in a small frequency range where the frequency for the auxiliary input is selected. This gives that it is possible to apply an auxiliary input with a reduced amplitude. An example is included to show the results.
Original languageEnglish
Title of host publicationProceedings of the American Control Conference
Publication date2014
ISBN (Print)978-1-4799-3272-6
Publication statusPublished - 2014
Event2014 American Control Conference - Hilton Portland & Executive Tower , Portland, OR, United States
Duration: 4 Jun 20146 Jun 2014


Conference2014 American Control Conference
LocationHilton Portland & Executive Tower
Country/TerritoryUnited States
CityPortland, OR
SeriesProceedings of American Control Conference


  • band-pass filters
  • closed loop systems
  • fault diagnosis
  • feedback
  • Components, Circuits, Devices and Systems
  • Active fault detection
  • Adaptive control
  • band-pass filter
  • Band-pass filters
  • Closed loop systems
  • closed-loop systems
  • controller modification
  • Fault detection
  • Fault diagnosis
  • feedback controller modification
  • feedback controllers
  • parametric faults
  • Transfer functions
  • Vectors
  • YJBK parameterization
  • YJBK-parameterization
  • Youla-Jabr-Bongiorno-Kucera parameterization


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