Apparatus and method for estimating concentration of vaporized f

Details Apparatus and method for estimating concentration of vaporized f Apparatus and method for estimating concentration of vaporized f

1998-08-07

2000-06-27

Kwon, John

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123295, F02B 7508

Patent

active

06079397&

ABSTRACT:
In a, so-called, lean burn engine having a vaporized fuel processor, a concentration of a vaporized fuel purged into an intake air passage (so-called, a purge concentration) is estimated using a normal type oxygen concentration sensor. Whenever a predetermined interval of time has passed, the engine combustion condition is forcefully and temporarily transferred into a stoichiometric air-fuel mixture ratio combustion condition during which the purge concentration is estimated on the basis of an output signal from the oxygen concentration sensor during an air-fuel mixture ratio feedback control.

REFERENCES:
patent: 5524600 (1996-06-01), Wild
patent: 5626122 (1997-05-01), Azuma
patent: 5655507 (1997-08-01), Kawasaki
patent: 5699778 (1997-12-01), Muraguchi et al.
patent: 5839421 (1998-11-01), Suzuki
patent: 5944003 (1999-08-01), Osanai

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