The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 28, 1993
Filed:
Apr. 25, 1991
Applicant:
Inventors:
Shigeru Kaseda, Chita, JP;
Koichi Takahashi, Chita, JP;
Toshihiko Niinomi, Hiroshima, JP;
Ryohei Funakoshi, Tokyo, JP;
Assignees:
Idemitsu Kosan Company Limited, Tokyo, JP;
Mitsubishi Jukogyo Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05B / ; G05B / ;
U.S. Cl.
CPC ...
364185 ; 364153 ;
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.