Air-fuel ratio controlling apparatus for an engine

Details Air-fuel ratio controlling apparatus for an engine Air-fuel ratio controlling apparatus for an engine

2008-05-27

2008-05-27

Argenbright, T. M. (Department: 3747)

Internal-combustion engines

Charge forming device

Including cylinder pressure or temperature responsive means

C123S478000, C123S673000, C701S104000

Reexamination Certificate

active

11703211

ABSTRACT:
An air-fuel ratio controlling apparatus includes an internal pressure detector for detecting an internal pressure of a combustion chamber of the engine. The apparatus estimates a motoring pressure of the engine and determines a start-of-combustion time, a time point when a difference between the internal pressure and the motoring pressure exceeds a predetermined value in a compression stroke and a combustion stroke of the engine. Firing delay for each cylinder is calculated from as a duration from sparking to the start-of-combustion time. Air-fuel ratio of each cylinder is estimated based on the firing delay and fuel injection amount for each cylinder is calculated to make the air-fuel ratio of plural cylinders uniform.

REFERENCES:
patent: 6742492 (2004-06-01), Kimura
patent: 7178507 (2007-02-01), Gangopadhyay
patent: 02-099745 (1990-04-01), None

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