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Method and Apparatus for Diagnosis of Sensors Faults Using Adaptive Fuzzy Logic

  • US 20090198408A1
  • Filed: 02/01/2008
  • Published: 08/06/2009
  • Est. Priority Date: 02/01/2008
  • Status: Active Grant
First Claim
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1. A method for detecting faults in a vehicle control system, said method comprising:

  • identifying a plurality of potential faults;

    identifying a plurality of measured values in the control system;

    identifying a plurality of estimated values based on models in the control system;

    identifying a plurality of residual error values as the difference between the estimated values and the measured values;

    defining a plurality of membership functions for each residual error value where the membership functions are adapted based on a vehicle operating region and/or vehicle operating conditions;

    determining a degree of membership value for each residual error value based on membership functions; and

    determining whether a fault exists by analyzing the degree of membership values.

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