Variable rate EGR valve with step motor control and method there

Details Variable rate EGR valve with step motor control and method there Variable rate EGR valve with step motor control and method there

1984-12-07

1987-11-24

Rosenthal, Arnold

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

251 42, 251 60, 137907, 123571, F16K 31126, F02M 2506

Patent

active

047083166

ABSTRACT:
A variable flow rate valve (10) comprising; a housing (12) defining a vacuum chamber (35) and a flexible diaphragm (50) secured to said housing (12). The diaphragm defines one extreme of the pressure chamber (35) and is movable in one direction in response to decreases in the pressure within the pressure chamber and movable in an opposite direction in response to increases in the pressure within the pressure chamber. The valve (10) further includes means (40, 100, 110, 112) for providing a mechanical position limit or stop for the diaphragm in the one direction and means (126, 84, 86, 92, 94) for selectively varying the pressure within the pressure chamber for causing the diaphragm to move in response to the pressure differential thereacross.

REFERENCES:
patent: 2554158 (1951-05-01), Spence
patent: 3023996 (1962-03-01), Robertson
patent: 3712578 (1973-01-01), Dawson
patent: 3762384 (1973-10-01), Day et al.
patent: 3990418 (1976-11-01), Nohira et al.
patent: 4284261 (1981-08-01), Benjamin et al.
patent: 4355606 (1982-10-01), Casey
patent: 4412517 (1983-11-01), Kobashi et al.
patent: 4414942 (1983-11-01), Itoh et al.
patent: 4422497 (1983-12-01), Komoda et al.
Step Motor Drive Circuitry and Open Loop Control (Author--J. Maginot and W. Oliver).

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