Data processing: measuring – calibrating – or testing – Measurement system – Performance or efficiency evaluation
Patent
1997-10-22
2000-06-06
Shah, Kamini
Data processing: measuring, calibrating, or testing
Measurement system
Performance or efficiency evaluation
73116, 714 25, G06F 900
Patent
active
060730897
ABSTRACT:
Systems and methods for detecting changes, and in particular faults, in a changing environment include constructing a profile of the environment using observations made during no fault conditions. A range of values for one or more "trusted" variables are identified as values indicative of a no fault condition. Data is also collected (only at times when the trusted variable(s) indicate(s) no fault) for other variables which may be indicative of a fault condition. Statistical profiles are established for each of these other variables. The environment is continuously monitored and the normal profile, as well as the thresholds/ranges, are preferably continuously updated during normal conditions, as indicated by the trusted variable(s). When, during monitoring of the environment, the trusted variable(s) exhibit value(s) outside the normal range, a possible fault condition is indicated and the present values of the other variables are examined to determine whether or not any of these variables exhibit values outside the normal profiled thresholds/ranges. Depending on which of these variables exhibits an abnormal value, a diagnosis of the fault may be possible. A method for determining the accuracy of trusted and fault variables is also disclosed.
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Baker Michelle
Ryan Thomas A.
Gordon David P.
Shah Kamini
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