Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
December 22, 2015
Patent Application Number
13922059
Date Filed
June 19, 2013
Patent Citations Received
Patent Primary Examiner
Patent abstract
Methods and systems are provided for accurately confirming fuel tank depressurization before unlocking a fuel door to enable refueling. Following a refueling request, a fuel system may be sealed from the atmosphere while one or more fuel system valves are adjusted to divert fuel tank pressure or vacuum to an engine intake. Depressurization may be inferred based on the presence of air or vapor flow into the intake as sensed by a manifold airflow sensor.
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