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Leak detection a vapor handling system

  • US 20010029933A1
  • Filed: 02/21/2001
  • Published: 10/18/2001
  • 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 while an engine is running comprising:

  • providing a pressure sensing element that obtains at least one pressure signal;

    closing a control valve and a shut off valve to seal the system from the engine and an atmosphere;

    generating a vacuum by opening the control valve;

    analyzing the at least one pressure signal at threshold times;

    comparing the at least one pressure signal to at least one pressure control value; and

    determining a leak condition if the at least one pressure signal is not less than the at least one pressure control value.

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