Fuel vapor leak test system and method comprising successive...

Measuring and testing – With fluid pressure – Motor part or auxiliary

Reexamination Certificate

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Reexamination Certificate

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06951126

ABSTRACT:
A leak test system and method for a motor vehicle fuel system. A pump forces air under pressure into vapor containment space. The pump operates in accordance with steps established by a processor. The pump creates superatmospheric pressure in the space during an initial charging phase step, and after completion of that step, the pump performs a measurement phase step that forces pulses of air into the space in a succession of pulse bursts. Each burst contains a succession of individual pulses, preferably in equal numbers, 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, preferably by constant time intervals. 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 indicates leakage from the space.

REFERENCES:
patent: 5297529 (1994-03-01), Cook et al.
patent: 5474050 (1995-12-01), Cook et al.
patent: 5606121 (1997-02-01), Blomquist et al.
patent: 5898108 (1999-04-01), Mieczkowski et al.
patent: 5974861 (1999-11-01), Cook et al.
patent: 6044314 (2000-03-01), Cook et al.
patent: 6301955 (2001-10-01), Cook et al.

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