DEVICE, METHOD AND PROGRAM FOR CONTROLLING AIR-FUEL RATIO OF INTERNAL COMBUSTION ENGINE FOR OUTBOARD MOTOR

摘要

PROBLEM TO BE SOLVED: To correct a difference in the air-fuel ratio generated in response to an engine speed with each zone of the engine speed.

SOLUTION: The air-fuel ratio control device includes an open loop control means for controlling the air-fuel ratio in the target air-fuel ratio based on an operation state of an internal combustion engine and a learning value stored in a storage part when existing in a predetermined engine speed area, a feedback control means for executing feedback control on the air-fuel ratio into the stoichiometric air-fuel ratio by using a feedback correction factor determined based on output of an O2sensor by transferring the target air-fuel ratio to the stoichiometric air-fuel ratio in a partial cylinder of the internal combustion engine from a state of controlling the target air-fuel ratio in the predetermined lean side air-fuel ratio by the open loop control means and a learning value calculating means for rewriting the storage part by calculating the learning value based on the feedback correction factor, and sets the learning value in respective zones by dividing the predetermined engine speed area into a plurality of zones.

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