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Leak detection in a closed vapor handling system using pressure, temperature and time

  • US 6,539,927 B2
  • Filed: 02/21/2001
  • Issued: 04/01/2003
  • Est. Priority Date: 02/22/2000
  • Status: Active Grant
First Claim
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1. A method of leak detection in a closed vapor handling system of an automotive vehicle, wherein an engine is shut off, comprising:

  • obtaining a start temperature and start pressure;

    providing an evaluation temperature;

    calculating a temperature differential between the start temperature and the evaluation temperature;

    incrementing a time counter if the temperature differential is greater than a temperature control value;

    computing a pressure differential between the start pressure and an evaluation pressure; and

    comparing the time counter to a time control value if the pressure differential is not greater than a pressure control value.

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