Title:
TEMPERATURE CONTROLLER
Document Type and Number:
Japanese Patent JPS63313214
Kind Code:
A
Abstract:
PURPOSE:To decrease the generation of a fault by deciding in which direction a temperature detected value is varied, and in which area said value exists, at the time of variation of a load capacity, and executing ON/OFF operations before an operation at the time of a stationary load. CONSTITUTION:A temperature controller brings a final control element 15 to ON/OFF operations, based on an output of a temperature detector 14 in order to allow a steel plate 11 to be brought to a surface treatment, to pass through in a solution 13 in a treatment tank 12 and to execute stably the surface treatment of the steel plate, and controls said solution 13 to a prescribed temperature. In this case, a detected value PV of the temperature detector 14 is supplied to not only a deviation calculating part 17 but also a difference calculating part 18, and a variation rate signal is derived and supplied to lower limit/upper limit variation rate direction deciding circuits 19, 20. Subsequently, when its has exceeded the lower and the upper limits, a conditional signal for bringing the final control element 15 to ON/OFF operations is outputted. This signal is sent to negative/positive area deciding circuits 21-22, and when it is decided that the condition has been formed, said signal is set to a holding memory 27 from OR circuits 25-26. In such a way, a temperature can be controlled appropriately in spite of a change of a load capacity.
More Like This:
| JPS62245038 | AUTOMATIC HOT WATER SUPPLY SYSTEM |
| JPS56155970 | CONTROLLER FOR FIXATION TEMPERATURE |
Inventors:
YAMASHITA HIDEAKI
ITO KOJIRO
ITO KOJIRO
Application Number:
JP14810087A
Publication Date:
December 21, 1988
Filing Date:
June 16, 1987
Export Citation:
Assignee:
KAWASAKI STEEL CO
TOSHIBA CORP
TOSHIBA CORP
International Classes:
G05D23/00; G05D23/19; (IPC1-7): G05D23/00; G05D23/19
Attorney, Agent or Firm:
Takehiko Suzue