Pressure sustaining apparatus

Details Pressure sustaining apparatus Pressure sustaining apparatus

1983-08-30

1985-05-21

Look, Edward K.

Pumps

Condition responsive control of pump drive motor

Having timer or delay means

307118, 417 44, F04B 4900

Patent

active

045183163

ABSTRACT:
A pressure sustaining apparatus which can be used for a braking force magnification apparatus for a vehicle includes a control circuit which energizes a DC motor and a vacuum pump or a compressor associated with the DC motor. When the absolute value of the gauge pressure generated by the pump or compressor reaches a predetermined threshold pressure, a sensor detects this condition and opens its contacts in response thereto. The contacts are connected to the control circuit which electrically energizes the DC motor for a predetermined length of time after the contacts of the sensor are opened. The predetermined length of time is determined by a time constant of a timer circuit included in the control circuit.

REFERENCES:
patent: 1786114 (1930-12-01), Hughes
patent: 2246932 (1941-06-01), Collins
patent: 3726607 (1973-04-01), Garman
patent: 3730645 (1973-05-01), Mashakaru et al.
patent: 3814542 (1974-06-01), Iglesias et al.
patent: 4164664 (1979-08-01), Kasiewicz
patent: 4171932 (1979-10-01), Miller
patent: 4201517 (1980-05-01), Ferguson
1982 Oldsmobile Cutlass Ciera and Omega Service Manual, 9/15/81, Service Department, Oldsmobile Division, General Motors Corporation.

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