Title:
WATER LEVEL CONTROLLER
Document Type and Number:
Japanese Patent JPH04171506
Kind Code:
A
Abstract:
PURPOSE:To keep a constant water level under stable control despite a small change of the water level by setting the opening amount of an inflow valve so as to be inversely proportional to the water level when the water level of a distributing reservoir approximates to a target level and controlling the opening amount of the inflow valve based on the difference between the set valve opening amount and the present opening amount. CONSTITUTION:An inflow valve 4 is provided together with a water level/valve opening amount setting means 7, a valve opening amount comparison means 8, and an inflow valve opening amount control means 9. When the water level signal received from a water level indicator 2 is inputted to the means 7, an inflow level opening amount is decided in response to the water level based on the prescribed control characteristic. That is, a constant inflow valve opening amount where the inflow exceeds the maximum outflow is kept until the water level approximates a target level. When the water level exceeds the target level, the inflow valve opening amount is set at a level inversely proportional to a level change set optionally. Then the valve opening amount is controlled based on the difference between the decided opening amount and the present one. Thus the water level is stably controlled despite a small change of the water level.
Inventors:
NAGAO TETSUYA
NANAO TERUAKI
NANAO TERUAKI
Application Number:
JP30064990A
Publication Date:
June 18, 1992
Filing Date:
November 05, 1990
Export Citation:
Assignee:
KUBOTA KK
International Classes:
G05B5/04; G05B6/00; G05D7/06; G05D9/12; (IPC1-7): G05B5/04; G05B6/00; G05D7/06; G05D9/12
Attorney, Agent or Firm:
Koichi Suzue (1 person outside)