Failure diagnostic apparatus for fuel vapor purge system and...

Details Failure diagnostic apparatus for fuel vapor purge system and... Failure diagnostic apparatus for fuel vapor purge system and...

2007-01-23

2007-01-23

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Simulating operating condition

Marine

C073S049700, C073S115060, C073S116070, C073S117020, C073S117020, C073S114220, C073S040000, C073S046000, C073S047000

Reexamination Certificate

active

11099479

ABSTRACT:
After a reference pressure using a reference hole is measured, a pressure in an evaporation path is measured. An ECU conducts failure diagnosis using, as a determination pressure for diagnosing presence/absence of a failure, a value obtained by correcting the reference pressure using the reference hole in a manner lowering the same by a predetermined amount, taking into account pressure lowering in the evaporation path due to condensation of fuel vapor at the time of adsorption in a canister when a vapor concentration in the evaporation path is high.

REFERENCES:
patent: 5679890 (1997-10-01), Shinohara et al.
patent: 6357288 (2002-03-01), Shigihama et al.
patent: 6651491 (2003-11-01), Saito et al.
patent: 6817232 (2004-11-01), Amano et al.
patent: 2006/0191330 (2006-08-01), Hayakawa et al.
patent: 2003-254172 (2003-09-01), None
patent: 2003-269265 (2003-09-01), None

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