Method of controlling fuel vapor canister purge flow and vapor management valve therefor
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United States of America Patent
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Apr 13, 1999
Grant Date -
N/A
app pub date -
Sep 16, 1998
filing date -
Sep 16, 1998
priority date (Note) -
Expired
status (Latency Note)
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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.
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