Practical model-based diagnosis with qualitative possibilistic uncertainty

  • Authors:
  • Didier Cayrac;Didier Dubois;Henri Prade

  • Affiliations:
  • Operations Support & Mission Optimization Dept., Toulouse Cedex, France;I.R.I.T., C.N.R.S., Université Paul Sabatier, Toulouse Cedex, France;-

  • Venue:
  • UAI'95 Proceedings of the Eleventh conference on Uncertainty in artificial intelligence
  • Year:
  • 1995

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Abstract

An approach to fault isolation that exploits vastly incomplete models is presented. It relies on separate descriptions of each component behavior, together with the links between them, which enables a focusing of the reasoning to the relevant part of the system. As normal observations do not need explanation, the behavior of the components is limited to anomaly propagation. Diagnostic solutions are disorders (fault modes or abnormal signatures) that are consistent with the observations, as well as abductive explanations. An ordinal representation of uncertainty based on possibility theory provides a simple exception-tolerant description of the component behaviors. We can for instance distinguish effects that are more or less certainly present (or absent) and effects that are more or less possibly present (or absent) when a given anomaly is present. A realistic example illustrates the benefits of this approach.