Method and apparatus for in-situ detection and isolation of aircraft engine faults
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for performing a fault estimation based on residuals of detected signals includes: determining an operating regime based on a plurality of parameters; extracting predetermined noise standard deviations of the residuals corresponding to said operating regime and scaling the residuals; calculating a magnitude of a measurement vector of the scaled residuals and comparing the 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 the operating regime; calculating a projection of the measurement vector onto the mean direction of each of the plurality of fault types; determining a fault type based on which projection is maximum; and mapping the projection to a continuous-valued fault level using a lookup table.
-
Citations
32 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A computer program product for enabling a computer to implement operations for performing a fault estimation based on a plurality of residuals of a plurality of detected signals, the computer program product comprising a computer readable medium and instructions on the computer readable medium, the operations 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. - View Dependent Claims (13, 14, 15, 19)
-
-
16. A method for detecting and isolating faults in a system, comprising:
-
detecting a plurality of signals;
determining a residual of each of said plurality of signals;
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. - View Dependent Claims (17, 18)
-
-
20. An apparatus for detecting and isolating faults in a system based on a plurality of residuals of a plurality of detected signals, said apparatus comprising:
a processor configured to determine an operating regime based on a plurality of parameters;
extract predetermined noise standard deviations of said residuals corresponding to said operating regime and scale said residuals;
calculate a magnitude of a measurement vector of said scaled residuals and compare said magnitude to a decision threshold value;
extract a mean direction and a fault level mapping for each of a plurality of fault types, based on said operating regime;
calculate a projection of said measurement vector onto said mean direction of each of said plurality of fault types;
determine 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
map said projection to a continuous-valued fault level using a lookup table.- View Dependent Claims (21, 22, 23, 24)
-
25. A system for detecting and isolating faults based on a plurality of residuals of a plurality of detected signals, said system comprising:
-
a detector which detects said detected signals;
an extended Kalman filter which compares said detected signals with estimates of said detected signals and outputs a plurality of residuals; and
a processor which performs hypothesis testing on said residuals to determine a fault type and a fault level. - View Dependent Claims (26, 27, 28, 29, 30)
-
-
31. A method for performing fault estimation based on a plurality of residuals of a plurality of detected signals, said method comprising:
-
comparing said detected signals with estimates of said detected signals, based on an extended Kalman filter, and outputting said residuals; and
determining a fault type and a fault level by performing hypothesis testing on said residuals. - View Dependent Claims (32)
-
Specification