Demand compensated hydraulic system with pilot line dither

Details Demand compensated hydraulic system with pilot line dither Demand compensated hydraulic system with pilot line dither

1977-06-24

1978-06-20

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

60451, 60484, 91429, 417212, F16H 3946

Patent

active

RE0296732

ABSTRACT:
A demand compensated hydraulic system includes a pump responsive to a pressurized fluid in a demand feedback pilot line. The pilot line is connected to sense fluid demand between a hydraulic motor and an associated control valve which is closed by servo feedback from the motor. A dither is connected to the pilot line to continuously oscillate the pressurized fluid in the pilot line to prevent the occurrence of a situation wherein the flow across the control valve is sufficient to prevent the pump from going to a stand-by condition while being insufficient to operate the motor to close the valve to thereby cause the pump to go into the standby condition.

REFERENCES:
patent: 2743582 (1956-05-01), Wiedmann
patent: 2892311 (1959-06-01), Van Gerpen
patent: 2892312 (1959-06-01), Allen et al.
patent: 3754400 (1973-08-01), Parquet
patent: 3826090 (1974-07-01), Bahl

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