Fuel vapor leak detecting apparatus, and fuel supplying...

Details Fuel vapor leak detecting apparatus, and fuel supplying... Fuel vapor leak detecting apparatus, and fuel supplying...

2006-07-18

2006-07-18

Moulis, Thomas (Department: 3747)

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

C123S519000, C123S520000

Reexamination Certificate

active

07077112

ABSTRACT:
A fuel vapor leak detecting apparatus, includes: a valve which is in a vapor purge system including a canister that is communicated with a fuel tank and an internal combustion engine, and which controllably closes the vapor purge system; a pressurizing section which introduces atmospheric air into the vapor purge system to pressurize the vapor purge system; and an internal-pressure measuring section which detects an internal pressure of the vapor purge system. The pressurizing section supplies the air for a predetermined time in a state where the vapor purge system is closed. When the internal pressure measured by the internal-pressure measuring section at the air supply is equal to or lower than a preset criterion pressure, it is judged that leak occurs.

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