Title:
PUMP OPERATION CONTROL SYSTEM IN LIQUID SUPPLY SYSTEM
Document Type and Number:
Japanese Patent JPS60211508
Kind Code:
A
Abstract:
PURPOSE:To suppress sufficiently fluctuation of water supply pressure by changing a prescribed time interval depending on the deviation between the water supply pressure and an object pressure so as to allow the control to follow sufficiently even when the operating water amount changes suddenly. CONSTITUTION:A microcomputer muCOn reads a data representing a pressure of a water supply pipe detected by a pressure sensor 8 from an input/output port PIA-1 via an interface F1 and compares it with an object pressure H0. When the water supply pressure H is larger than the pressure H0, a difference DELTAH between the pressures H and H0 is obtained, a wait time DELTAt is calculated from the difference DELTAH and the wait time DELTAt is executed. Then the present operating speed N of a pump is decreased by a prescribed speed DELTAN and the state restores to the original state. When the pressure H is smaller than the H0, the value DELTAH=H0-H is operated, the wait time DELTAt is calculated by the obtained difference DELTAH and it is executed. Then the speed N is increased by the DELTAN and the system restores to the original state.
Inventors:
SATOU KOUICHI
Application Number:
JP6665684A
Publication Date:
October 23, 1985
Filing Date:
April 05, 1984
Export Citation:
Assignee:
HITACHI LTD
International Classes:
F04D15/00; F04B49/02; F04B49/06; F04B49/08; G05B11/18; G05B21/02; (IPC1-7): F04B49/02; F04B49/08; F04D15/00; G05B11/18; G05B21/02
Domestic Patent References:
| JPS5392089A | 1978-08-12 | |||
| JPS57103505A | 1982-06-28 | |||
| JP46014925A | ||||
| JPS50146783A | 1975-11-25 | |||
| JPS596207B2 | 1984-02-09 |
Attorney, Agent or Firm:
Kenjiro Take