FUZZY CLASSIFICATION APPROACH TO FAULT PATTERN MATCHING
First Claim
1. A method of diagnosing faults in a monitored system, comprising:
- generating estimates of parameter data for parameters monitored on the monitored system by using reference parameter data characteristic of known behavior of the system;
comparing the generated estimates of the parameter data with measured parameter data;
determining a residual for each of the parameters based on a relationship between the generated estimates of the parameter data and the measured parameter data; and
implementing at least one fuzzy classification rule to determine a likelihood that a predetermined fault exists, the fuzzy classification rules using residuals of parameters used to indicate the existence of the predetermined fault.
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Abstract
A method and apparatus are provided for diagnosing faults in a monitored system. Estimates of parameter data are generated from the system with reference parameter data characteristic of known behavior of the system. The generated estimates of the parameter data are compared with measured parameter data. A residual is determined for each of the parameters based on a relationship between the estimates of the parameter data and the measured parameter data. A fuzzy classification rule is implemented to determine a likelihood that a predetermined fault exists by using residuals for parameters used to indicate the existence of the predetermined fault.
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Citations
15 Claims
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1. A method of diagnosing faults in a monitored system, comprising:
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generating estimates of parameter data for parameters monitored on the monitored system by using reference parameter data characteristic of known behavior of the system; comparing the generated estimates of the parameter data with measured parameter data; determining a residual for each of the parameters based on a relationship between the generated estimates of the parameter data and the measured parameter data; and implementing at least one fuzzy classification rule to determine a likelihood that a predetermined fault exists, the fuzzy classification rules using residuals of parameters used to indicate the existence of the predetermined fault. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A monitoring apparatus for diagnosing faults in a system, comprising:
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a reference library containing reference parameter data characteristic of known behavior of the system; a fuzzy logic engine configured to; generate estimates of parameter data from the system with reference parameter data characteristic of known behavior of the system; compare the generated estimates of the parameter data with measured parameter data; determine a residual for each of the parameters based on a relationship between the estimates of the parameter data and the measured parameter data; and
implement at least one fuzzy classification rule to determine a likelihood that a set of outputs corresponds to a predetermined fault, wherein the outputs are generated based on the residual for each of the parameters that corresponds to the predetermined fault. - View Dependent Claims (11, 12, 13)
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14. A monitoring apparatus for diagnosing faults in a system, comprising:
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a real-time data processing module that provides residuals representing a relationship between generated estimates of parameter data, and measured parameter data, the generated estimates being based on reference parameter data characteristics of known behavior of the system; a failure mode database that stores fault patterns that each indicate a predetermined fault; a fuzzy pattern recognition module configured for; receiving fault patterns from the failure mode database and residuals from the real-time data processing module, implementing at least one fuzzy classification rule that uses the residuals to calculate a set of outputs, determining if the outputs indicate a likelihood that the predetermined fault exists; and a diagnosis and actions output module that acts depending on whether or not a predetermined fault is determined to exist and a classification of the fault. - View Dependent Claims (15)
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Specification