Method of controlling fuel vapor canister purge flow and vapor m

Details Method of controlling fuel vapor canister purge flow and vapor m Method of controlling fuel vapor canister purge flow and vapor m

1998-09-16

1999-04-13

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123458, 123516, F02M 3704

Patent

active

058933549

ABSTRACT:
A fuel vapor management valve or VMV having an electrically operated vent valve for controlling atmospheric bleed flow to a vacuum signal pressure chamber. The pressure in the signal pressure chamber controls the differential pressure acting on opposite sides of a diaphragm which moves a valve member for regulating fuel vapor purge flow from a canister to the engine intake manifold. Vacuum is applied to the signal pressure chamber through restrictive passages in a connector which prevent sonic flow choking. In one embodiment two orifices are spaced fluidically in series. In another embodiment fluidically parallel laminar flow passages are provided in an element comprising a porous filter preferably formed of fibrous material or sintered metal. In another embodiment, the laminar flow element is disposed fluidically in series with a flow restricting orifice.

REFERENCES:
patent: 5188141 (1993-02-01), Cook
patent: 5277167 (1994-01-01), DeLand et al.
patent: 5284121 (1994-02-01), Abe
patent: 5390644 (1995-02-01), Nunogaki
patent: 5460137 (1995-10-01), Zabek
patent: 5630403 (1997-05-01), Van Kampen
patent: 5632242 (1997-05-01), Harde
patent: 5749349 (1998-05-01), Detweiler

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