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Leak detecting device for fuel vapor treatment unit

  • US 7,272,488 B2
  • Filed: 06/01/2005
  • Issued: 09/18/2007
  • Est. Priority Date: 06/01/2004
  • Status: Active Grant
First Claim
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1. A leak detecting device for a fuel vapor treatment unit that purges a vapor gas generated through evaporation of fuel in a fuel tank into an intake system of an engine, comprising:

  • a valve that can selectively seal the fuel vapor treatment unit;

    a pressure detecting sensor that detects a pressure in the fuel vapor treatment unit; and

    a controller programmed to;

    issue a command to close the valve with a view to sealing the fuel vapor treatment unit during stoppage of the engine;

    calculate deviation amounts of the detected pressures during stoppage of the engine after the fuel vapor treatment unit has been sealed;

    integrate absolute values of the deviation amounts, anddetermine, based on an integrated value, whether or not there is a leak occurring in the fuel vapor treatment unit.

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