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Method and apparatus for in-situ detection and isolation of aircraft engine faults

  • US 20060142976A1
  • Filed: 12/29/2004
  • Published: 06/29/2006
  • Est. Priority Date: 12/29/2004
  • Status: Active Grant
First Claim
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1. A method for performing a fault estimation based on a plurality of residuals of a plurality of detected signals, comprising:

  • determining an operating regime based on a plurality of parameters;

    extracting predetermined noise standard deviations of said residuals corresponding to said operating regime and scaling said residuals;

    calculating a magnitude of a measurement vector of said scaled residuals and comparing said magnitude to a decision threshold value;

    extracting a mean direction and a fault level mapping for each of a plurality of fault types, based on said operating regime;

    calculating a projection of said measurement vector onto said mean direction of each of said plurality of fault types;

    determining a fault type based on a maximum projection of said measurement vector onto said mean direction of each of said plurality of fault types; and

    mapping said projection to a continuous-valued fault level using a lookup table.

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