Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage
Patent
1986-07-28
1987-11-24
Freeh, William L.
Pumps
Condition responsive control of drive transmission or pump...
Adjustable cam or linkage
417222, 60450, 60459, F04B 4900
Patent
active
047085967
ABSTRACT:
A pressure and delivery regulating device for an adjustable pump includes a directional control valve connected in a discharge conduit and to a control conduit branching from the discharge conduit between the pump and the directional control valve. The control conduit leads to a setting piston for the adjustment of the pump. The directional control valve is controlled by a solenoid which in turn is controlled by a control system consisting of a regulating circuit, a delivery limiting circuit and a control circuit for the solenoid. The output signal from the regulating circuit controls a desired delivery value signal supplied to the delivery limiting circuit. A follow-up circuit connected between the regulating circuit and the delivery limiting circuit corrects the regulating signal and a circuit for producing a direction dependent signal from the actual pressure provides a damping of the regulating circuit.
REFERENCES:
patent: 3777492 (1973-12-01), Boydell et al.
patent: 3996744 (1976-12-01), Ridge
patent: 4158529 (1979-06-01), Nonnemacher et al.
patent: 4325677 (1982-04-01), Nonnemacher et al.
Palm Volker
Pfuhl Berthold
Freeh William L.
Neils Paul F.
Robert & Bosch GmbH
Striker Michael J.
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