Method and apparatus for detecting and identifying faulty sensor

Details Method and apparatus for detecting and identifying faulty sensor Method and apparatus for detecting and identifying faulty sensor

1995-08-11

1997-10-21

Beausoliel, Jr., Robert W.

Excavating

371 26, 36455101, 36457102, G06F 1108

Patent

active

056804091

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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