Evaporative emission canister purge actuation monitoring system having an integrated fresh air filter
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United States of America Patent
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Issued Date -
May 21, 2009
app pub date -
Nov 19, 2007
filing date -
Nov 19, 2007
priority date (Note) -
Abandoned
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Abstract
An evaporative emission canister purge actuation monitoring system includes an integrated valve body having a main flow passage, and an air filter assembly disposed adjacent the valve body and providing fluid communication between the main flow passage and the ambient air. A first one-way umbrella valve mounted to the valve body that is responsive to predetermined positive pressure in the main flow passage to control flow of fluid from a vapor canister to ambient air as well as a second one-way umbrella valve that is responsive to a predetermined negative pressure in the main flow passage to control the flow of ambient air through a fresh air port.
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