Method for controlling air fuel ratio of an internal combustion

Details Method for controlling air fuel ratio of an internal combustion Method for controlling air fuel ratio of an internal combustion

1993-06-15

1995-05-30

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02M 5100

Patent

active

054193028

ABSTRACT:
A method for controlling air-fuel ratio of an internal combustion engine with an adaptive learning control system. In recent years, as vaporized fuel restrictions are becoming stringent, a large quantity of vaporized fuel purged into an engine has a greater effect on an air-fuel ratio feedback control of an engine. Therefore, a portion originated from the vaporized fuel in the learning data is so much as being unable to be neglected. At an engine start, that portion hampers controlling an engine properly, resulting in adverse effects on emissions and startability.
The present invention provides a method for eliminating such adverse effects by erasing the learning data originated from vaporized fuel exclusively before an engine start.

REFERENCES:
patent: 5080064 (1992-01-01), Buslepp et al.
patent: 5243951 (1993-09-01), Nakaniwa
patent: 5255662 (1993-10-01), Nakajima
patent: 5257613 (1993-11-01), Monda et al.
patent: 5297046 (1994-03-01), Nakaniwa

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