Air/fuel ratio control system for outboard motor engine

Details Air/fuel ratio control system for outboard motor engine Air/fuel ratio control system for outboard motor engine

2006-12-05

2006-12-05

Argenbright, T. M. (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C701S109000

Reexamination Certificate

active

07143755

ABSTRACT:
In an air/fuel ratio control system for an outboard motor engine, a learned correction coefficient KTIMn used in open-loop control for correcting a basic fuel injection amount to be supplied to the engine, is updated only when the manifold absolute pressure PBA (indicative of engine load) is within a predetermined range relative to the engine speed NE concerned. As a result, the air/fuel ratio can be accurately controlled to one other than the stoichiometric air/fuel ratio, even when an O2sensor that produces an output whose property only changes near the stoichiometeic air/fuel ratio is used.

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patent: 5704339 (1998-01-01), Choe et al.
patent: 6014962 (2000-01-01), Sato et al.
patent: 57-105530 (1982-07-01), None

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