Apparatus for and method of detecting a malfunction of a control

Details Apparatus for and method of detecting a malfunction of a control Apparatus for and method of detecting a malfunction of a control

1991-04-25

1993-09-28

Smith, Jerry

Boots, shoes, and leggings

364153, G05B 1302, G05B 902

Patent

active

052491196

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.

REFERENCES:
patent: 3566241 (1971-02-01), Ross
patent: 4214301 (1980-07-01), Kurihara et al.
patent: 4509110 (1985-04-01), Levesque, Jr. et al.
patent: 4872104 (1989-10-01), Holsinger
patent: 4885676 (1989-12-01), Zweighaft
patent: 4999557 (1991-03-01), Inoue
patent: 5072357 (1991-12-01), Niessen et al.

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