Automatic control circuit for an electrically powered hydraulic

Details Automatic control circuit for an electrically powered hydraulic Automatic control circuit for an electrically powered hydraulic

1975-01-17

1976-03-02

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Apparatus having means responsive to or ameliorating the...

60405, 60DIG2, 180 82R, F15B 2000, F15B 1116

Patent

active

039409317

ABSTRACT:
An emergency hydraulic system for use in a vehicle having an engine which not only powers the vehicle but also drives a main hydraulic pump to supply hydraulic fluid under pressure to a hydraulic control means is disclosed. The emergency hydraulic system includes an auxiliary hydraulic pump driven by an electric motor to provide an auxiliary source of hydraulic fluid under pressure to the hydraulic control means under emergency conditions. An electrical control circuit for the electric motor is described which control circuit will automatically activate the electric motor whenever the engine is operating normally but the flow of hydraulic fluid from the main hydraulic pump falls below a given level and will automatically inactivate the electric motor whenever the engine is operating normally and the flow of hydraulic fluid from the main hydraulic pump is above a given level. As disclosed, the control circuit also includes means for the manual operation thereof and means for automatically activating the electric motor only if the engine of the vehicle should fail after it has been in normal operation.

REFERENCES:
patent: 2954671 (1960-10-01), Kress
patent: 3434282 (1969-03-01), Shelhart
patent: 3762492 (1973-10-01), Rory

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