Part throttle control -- pump override

Details Part throttle control -- pump override Part throttle control -- pump override

1975-06-04

1976-06-15

Freeh, William L.

Pumps

Condition responsive control of drive transmission or pump...

Plural pumps with individual or relative control

60428, 60447, 60449, F04B 4900, F16D 3102

Patent

active

039633780

ABSTRACT:
A hydraulic power system having a plurality of variable displacement pumps for supplying pressurized fluid for manipulation of an implement includes control means operative to automatically adjust pump displacement to the output horsepower of a prime mover driving the pumps of a system. The control system includes underspeed valve means responsive to a deviation in the speed of the prime mover from a predetermined normal speed to transmit a fluid pressure signal to a servo control means for adjusting the displacement of the pumps. The underspeed valve means includes adjusting means for adjusting the underspeed valve to respond to a deviation from other engine speeds different from the normal operating speed.

REFERENCES:
patent: 3672166 (1972-06-01), Isaac
patent: 3732036 (1973-05-01), Busbey et al.
patent: 3841795 (1974-10-01), Ferre et al.
patent: 3884039 (1975-05-01), Pourian

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