Transpired fuel gas leak detecting device

Details Transpired fuel gas leak detecting device Transpired fuel gas leak detecting device

2007-12-25

2007-12-25

Nghiem, Michael (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Mechanical measurement system

Reexamination Certificate

active

10557425

ABSTRACT:
A leak detecting system for a transpiration purge system including a fuel tank1and a canister13includes a jet pump8, which leads the atmosphere into the fuel tank1using a return flow of excess fuel of fuel pumped to an internal combustion engine, internal pressure measuring means15, and fuel volume detecting means18. After intaking air via pressurizing means for a predetermined time, the leak detecting system judges that a leak is present when a holding pressure measurement value in a state in which the transpiration purge system is closed is lower than a decompression calculation value calculated from a pressurization measurement value, an air volume, and a leak hole diameter.

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