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Fuel vapor leak detecting apparatus, and fuel supplying apparatus to be applied to the same

  • US 20040154596A1
  • Filed: 02/05/2004
  • Published: 08/12/2004
  • Est. Priority Date: 02/07/2003
  • Status: Active Grant
First Claim
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1. A fuel vapor leak detecting apparatus, comprising:

  • 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;

    wherein the pressurizing section supplies the air for a predetermined time in a state where the vapor purge system is closed, and, 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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