Pumps – Condition responsive control of drive transmission or pump... – Having condition responsive pumped fluid control
Patent
1986-08-26
1989-01-31
Freeh, William L.
Pumps
Condition responsive control of drive transmission or pump...
Having condition responsive pumped fluid control
417218, F04B 130
Patent
active
048012475
ABSTRACT:
A variable displacement piston pump of the type in which the hydraulic pressure in a pressure chamber of an output flow variable element is controlled by a proportional electro-hydraulic control valve to control the displacement of the variable element against a spring to vary the output flow within a range between a maximum output flow and a full cut-off and the output pressure or both the output pressure and the output flow of the pump are controlled electro-hydraulically through a closed loop. The variable displacement piston pump includes flow detector for generating an electric signal corresponding to the output flow of the pump, pressure detector for generating an electric signal corresponding to the output flow of the pump, and control amplifier responsive to the difference between a flow setting signal and the output signal of the flow detector to control a driving control current supplied to the proportional electro-hydraulic control valve and also responsive to the detected output pressure reaching a predetermined value to control the driving control signal in accordance with the difference between a pressure setting signal and the output signal of the pressure detector.
REFERENCES:
patent: 4432703 (1984-02-01), Beutler
patent: 4456434 (1984-06-01), Ibiary
patent: 4507057 (1985-03-01), Igarashi
patent: 4510750 (1985-04-01), Izumi
patent: 4655689 (1987-04-01), Westveer
patent: 4699571 (1987-10-01), Bartholomaus
Egi Masao
Hashimoto Toshio
Hattori Siro
Ohashi Akira
Shingu Yasuyuki
Freeh William L.
Yuken Kogyo Kabushiki Kaisha
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