Constant torque control system for a variable displacement pump

Details Constant torque control system for a variable displacement pump Constant torque control system for a variable displacement pump

1984-12-31

1986-09-23

Freeh, William L.

Pumps

Condition responsive control of drive transmission or pump...

Plural pumps with individual or relative control

417218, 417222, 60447, 60452, F04B 4900

Patent

active

046132864

ABSTRACT:
A control system for a variable displacement pump or pumps driven by a vehicular engine for supplying pressurized fluid to implement actuators via implement control valves. Included is a servomechanism comprising a servoactuator section coupled to each variable displacement pump for varying the per cycle displacement thereof, a servovalve section for operating the servoactuator section by fluid pressure from a fixed displacement pump, and a control section for actuating the servovalve section. The servomechanism control section has a control piston displaced by variable fluid pressures from the variable displacement pumps against the effect of at least two springs. The springs are so arranged that their spring constant changes as the control piston travels to a predetermined position intermediate the opposite extreme positions thereof, in order to make possible the constant torque control of each variable displacement pump for the effective use of the engine output horsepower.

REFERENCES:
patent: 3510231 (1970-05-01), Bobst
patent: 3732036 (1973-05-01), Busbey et al.
patent: 3767327 (1973-10-01), Wagenseil
patent: 3841795 (1974-10-01), Ferre et al.
patent: 3897174 (1975-07-01), Cappelle
patent: 4203712 (1980-05-01), Uehara
patent: 4248574 (1981-02-01), Uehara et al.
patent: 4498847 (1985-02-01), Akiyama

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