Fuel delivery system with pressure-controlled electric pump

Details Fuel delivery system with pressure-controlled electric pump Fuel delivery system with pressure-controlled electric pump

1986-10-10

1988-03-01

Croyle, Carlton R.

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

200 83N, 307118, F04B 4906, H01H 3540

Patent

active

047282649

ABSTRACT:
A fuel delivery system which includes a fuel pump and a dc motor, which are preferably contained within a unitary housing. A pressure-sensitive switch, which is either contained within the unitary pump/motor housing or as a separate structure, includes a movable contact positioned within a housing so as to form a first chamber for receiving fuel under pressure and a second chamber for venting to atmosphere. A spring urges the movable contact against a second contact for applying electrical power to the pump motor. When the pump output pressure exceeds the force exerted on the movable contact by the spring, electrical conduction between the switch contacts is broken and motor power is interrupted. Current to the pump motor is thus pulse-width modulated as a function of pump output pressure, fuel demand, and the adjustable force exerted by the pressure switch spring.

REFERENCES:
patent: 1560044 (1925-11-01), Derrick
patent: 2477801 (1949-08-01), Hathaway
patent: 2717553 (1955-09-01), Parker
patent: 3005067 (1961-10-01), Leibold et al.
patent: 3104614 (1963-09-01), Gramenzi
patent: 3119437 (1964-01-01), Roosa
patent: 3345479 (1967-10-01), Schaber
patent: 3600601 (1971-08-01), Ayres
patent: 3657556 (1972-04-01), Foster
patent: 3738776 (1973-06-01), Debare
patent: 4118612 (1978-10-01), Gabus
patent: 4205237 (1980-05-01), Miller
patent: 4447192 (1984-05-01), Tuckey
patent: 4462758 (1984-07-01), Speed

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