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Fuel vapor leak test system and method comprising successive series of pulse bursts and pressure measurements between bursts

  • US 20030192365A1
  • Filed: 04/15/2002
  • Published: 10/16/2003
  • Est. Priority Date: 04/15/2002
  • Status: Active Grant
First Claim
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1. A leak test system for a motor vehicle fuel system that holds volatile liquid fuel for operating the vehicle, the leak test system comprising:

  • a processor for establishing steps of a leak test;

    a pump for forcing air under pressure into vapor containment space of the fuel system during a leak test;

    a pump operator that operates the pump in accordance with steps established by the processor to cause the pump to create a superatmospheric pressure in the space during an initial step of the leak test, and that, after completion of the initial step, causes the pump to perform a further step that comprises forcing pulses of air into the space in a succession of pulse bursts, wherein each burst comprises a succession of individual pulses of air, and each successive burst is delayed from an immediately prior burst by a time interval substantially longer than the time intervals between individual pulses in each burst; and

    wherein the processor processes data corresponding to a measurement of pressure in the space after the occurrence of at least one of such bursts and as a result of that processing indicates leakage from the space.

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