Apparatus for and method of detecting a malfunction of a controller
US5249119A · kind A · utility
7Cited by
7References
10Claims
0Family size
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Key dates
| Filing date | Apr 25, 1991 |
| Grant date | Sep 28, 1993 |
| Priority date | — |
| Expiry date | Apr 25, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B9/02
- WIPO fieldControl
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.