System for evaporative and refueling emission control for a vehicle
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United States of America Patent
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Aug 23, 2016
Grant Date -
Jun 21, 2012
app pub date -
Sep 23, 2011
filing date -
Sep 24, 2010
priority date (Note) -
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Abstract
A fuel tank evaporative emissions control and diagnostic system includes a fuel tank, a canister in fluid communication with the fuel tank to receive vapor escaping from the fuel tank, at least one isolation valve positioned between the fuel tank and the canister, a pressure sensor in fluid communication with the canister, a purge valve positioned between the canister and an internal combustion engine to be in fluid communication with the canister and the internal combustion engine, a canister vent valve positioned on an air inlet of the canister for allowing air to purge vapor from the canister to exit the and into the internal combustion engine, and one or more electronic controllers coupled to the pressure sensor, the isolation valve, the purge valve, and the canister vent valve for controlling the valves according to a preset diagnostic test for checking for malfunctions in the system.
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