Method and apparatus for detecting failures in a control system

Details Method and apparatus for detecting failures in a control system Method and apparatus for detecting failures in a control system

1982-06-07

1985-04-02

Smith, Jerry

Boots, shoes, and leggings

364150, 364161, 364184, 318563, 318624, G05B 1700

Patent

active

045091102

ABSTRACT:
A system for detecting the failure of a control system and its object includes a mathematical model of the control system and its object which continuously predicts the output of the object. An error signal is continuously calculated which is the difference between the model output and the actual output of the object. Error signals exceeding a predetermined minimum value or deadband are integrated; but the integral is reset to zero whenever the error signal value falls within a predetermined range indicative of normal steady state operating tolerances. If the value of the integral reaches a specified level before being reset to zero, a failure signal is triggered. This failure detection system can be made sensitive to relatively small error signals without triggering a false failure signal if the small error was the result of only a temporary problem or due to inaccuracies in model simulation.

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patent: 4374433 (1983-02-01), Kundler et al.
patent: 4415966 (1983-11-01), Herzog

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