Leak diagnosis device

Details Leak diagnosis device Leak diagnosis device

2008-03-25

2008-03-25

Cronin, Stephen K. (Department: 3747)

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

C123S518000, C123S519000, C073S118040, C073S049700

Reexamination Certificate

active

07347194

ABSTRACT:
Concentration measurement is performed multiple times from a period in which pressure in a purge device increases due to generation of fuel vapor after operation of an engine is stopped. A concentration stabilization period, in which a change in the fuel vapor concentration is equal to or less than a reference value, is calculated based on results of the multiple times of the concentration measurement. Leak diagnosis is performed during the concentration stabilization period. As a result, even if a period for the pressure in the purge device to stabilize fluctuates due to an environment in which a vehicle is located, the leak diagnosis can be performed immediately when the pressure in the purge device stabilizes and a state suitable for the leak diagnosis is reached.

REFERENCES:
patent: 6971375 (2005-12-01), Amano et al.
patent: 2005/0039525 (2005-02-01), Wakahara et al.
patent: 2005/0217348 (2005-10-01), Amano et al.
patent: 2006/0042605 (2006-03-01), Amano et al.
patent: 2006/0174698 (2006-08-01), Chung et al.
patent: 2007/0157908 (2007-07-01), Kano et al.
patent: 2007/0181103 (2007-08-01), Okuda
patent: 2007/0199374 (2007-08-01), Shibuya
patent: 2004-293438 (2004-10-01), None

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