Vacuum leak verification system and method
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United States of America Patent
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Apr 2, 2002
Grant Date -
N/A
app pub date -
Sep 8, 2000
filing date -
Sep 9, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a purge mode, a purge flow path extends from atmosphere through the vent valve, through the evaporative emission space, and through the purge valve to the engine intake system. In a pre-conditioning phase of a leak verification mode, a pre-conditioning flow path extends from atmosphere through the vent valve and the purge valve to the engine intake system without passing through the evaporative emission space. In a test phase of the leak verification mode, a test path extends from the evaporative emission space through the dirty air port, through the canister medium, through the clean air port, and through the purge valve to the engine intake system.
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