Method for detecting liquefied fuel in canister purge line...

Details Method for detecting liquefied fuel in canister purge line... Method for detecting liquefied fuel in canister purge line...

2008-01-08

2008-01-08

Cronin, Stephen K. (Department: 3747)

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

C123S1980DA, C123S516000

Reexamination Certificate

active

07316224

ABSTRACT:
A method of detecting whether liquefied fuel exists in a canister purge line includes, if a fuel level in a fuel tank is higher than a pre-set level, opening a purge control valve for a time. A difference is calculated between the air-fuel ratio before and after opening the purge control valve. If the difference is less than or equal to a first value and the air-fuel ratio after opening the purge control valve is less than or equal to a second value, then it is deemed that liquefied fuel exists in the canister purge line. If liquefied fuel is deemed to exist in the canister purge line, the purge control valve may be closed for a certain amount of time.

REFERENCES:
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patent: 6269803 (2001-08-01), Corkill
patent: 6561166 (2003-05-01), Halleron et al.
patent: 6689196 (2004-02-01), Amano et al.
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patent: 6235346 (1994-08-01), None
patent: 11287160 (1999-10-01), None
patent: 2004-068738 (2004-03-01), None

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