Apparatus for and method of detecting a malfunction of a controller
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United States of America Patent
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-
Sep 28, 1993
Grant Date -
N/A
app pub date -
Apr 25, 1991
filing date -
May 2, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An deviation E between a setting value SV and an actual phase value PV in a controller is integrated, and the resulting integrated value S is compared with a predetermined threshold D for detecting a malfunction. Checking a change in setting value SV, checking an increase or a decrease in deviation E and comparison with the absolute value .vertline.E.times.S.vertline. are made to ensure stability against fluctuations and rapid detection of a malfunction.
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