| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve fuel efficiency by increasing an operation time at a target air fuel ratio by using a last learning value when there is a small possibility an actual air fuel ratio may deviate from the target air fuel ratio.SOLUTION: At a start of an internal combustion engine, feedback control means changes a target air fuel ratio to an ideal air furl ratio based upon a last learning value, and open-loop control means controls the air fuel ratio to the target air fuel ratio by using the last learning value when a feedback correction coefficient determined based upon the output of an Osensor is within a predetermined range, but learning value update means updates the last learning value to a learning value calculated by learning value calculation means when the feedback correction coefficient determined based upon the output of the Osensor is not within the predetermined range.</p> |
