Title:
SAMPLE VALUE PI CONTROLLING DEVICE
Document Type and Number:
Japanese Patent JPS61224008
Kind Code:
A
Abstract:
PURPOSE:To cope with disturbance that occurred in the middle of a controlling operational period by providing a disturbance detecting device and executing propotional integrating operation forcibly for a fixed time when the output of the device is generated. CONSTITUTION:A disturbance detecting device 404 watches upper limit, lower limit, amount of deviation and rate of change of measured values PV, and transmits a forcible operation command signal PA when one of then exceeded allowable values. When the timing of the signal PA is out of operating time in a controlling operation period, a signal PL for executing operation by the timing rises up, and make a PI (proportional integration) operating device 402 execute operation forcibly. The detection of disturbance is executed at a fixed period at a period quicker than a period of controlling operation, and when the new disturbance is found after the next detection period, the forcible operation similar to the above-mentioned is executed. Thus, the controlling characteristic of the controlling device can be improved additionally.
Inventors:
IAI TOSHIYUKI
Application Number:
JP6597185A
Publication Date:
October 04, 1986
Filing Date:
March 29, 1985
Export Citation:
Assignee:
YOKOGAWA ELECTRIC CORP
International Classes:
G05B11/42; G05B21/02; G05B23/02; (IPC1-7): G05B11/42; G05B21/02
Domestic Patent References:
| JPS5721042U | 1982-02-03 | |||
| JPS5720003B1 | 1982-04-26 | |||
| JPS596207B2 | 1984-02-09 | |||
| JPS6022210A | 1985-02-04 |
Attorney, Agent or Firm:
Shinsuke Ozawa
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