Method and apparatus for detecting and identifying faulty sensors in a process
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United States of America Patent
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Oct 21, 1997
Grant Date -
N/A
app pub date -
Aug 11, 1995
filing date -
Aug 11, 1995
priority date (Note) -
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Abstract
A method and apparatus is provided for detecting a faulty sensor within a process control system having a set of sensors, each of which produces an associated sensor output signal. The method and apparatus produce a set of sensor estimate signals from the sensor output signals using principal component analysis and then determine a validity index for each of the sensors as a ratio of two residuals, wherein each of the residuals represents a different measure of the difference between the sensor output signals and the sensor estimate signals. The determined validity indexes are then used to detect a failure of one of the sensors and/or to identify which one of the sensors has failed.
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