Failure diagnosis apparatus for evaporative fuel processing...

Details Failure diagnosis apparatus for evaporative fuel processing... Failure diagnosis apparatus for evaporative fuel processing...

2007-01-09

2007-01-09

Kwon, John T. (Department: 3747)

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

C123S518000

Reexamination Certificate

active

11204970

ABSTRACT:
A failure diagnosis apparatus for diagnosing a failure of an evaporative fuel processing system wherein a pressure in the evaporative fuel processing system is detected, and a purge control valve and a vent shut valve are closed when stoppage of the engine is detected. A determination is made as to whether there is a leak in the evaporative fuel processing system based on the detected pressure during a predetermined determination period after closing of the purge control and vent shut valves. The determination result is decided according to a parameter indicative of an amount of evaporative fuel generated in the fuel tank after stoppage of the engine.

REFERENCES:
patent: 6336446 (2002-01-01), Isobe et al.
patent: 6467463 (2002-10-01), Kitamura et al.
patent: 6789523 (2004-09-01), Oki et al.
patent: 6950742 (2005-09-01), Yamaguchi et al.
patent: 7040302 (2006-05-01), Yamaguchi et al.
patent: 2002-357164 (2002-12-01), None

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