Fuel vapor treatment system with leak diagnosing

Details Fuel vapor treatment system with leak diagnosing Fuel vapor treatment system with leak diagnosing

2008-04-29

2008-04-29

Wolfe, Willis R. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C123S520000, C073S118040

Reexamination Certificate

active

11261474

ABSTRACT:
A fuel vapor purge system is configured to execute a highly accurate leak diagnosis with respect to a fuel vapor leak. After the engine is stopped, the temperature of the fuel vapor rises temporarily and then decreases until it reaches the outside ambient temperature. During this period, the purge line is closed off and a minimum value reached by the purge line pressure is detected. The difference between the minimum value of the purge line pressure and the atmospheric pressure is compared to a threshold value. The purge system is diagnosed as “normal” if the difference is equal to or larger than the threshold value and a “leaking” if the difference is less than the threshold value.

REFERENCES:
patent: 6276343 (2001-08-01), Kawamura et al.
patent: 6367458 (2002-04-01), Furusho et al.
patent: 6389882 (2002-05-01), Ohkuma
patent: 6832509 (2004-12-01), Morinaga et al.
patent: 2003-74421 (2003-03-01), None

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