| 摘要 |
With an internal combustion engine wherein a target air-fuel ratio is set on the basis of engine load and engine rotational speed, a setting for a lean air-fuel ratio for improving fuel consumptions prohibited, when an increase in grade resistance is detected or when winding road conditions are estimated, and sets a target air-fuel ratio to ensure drive power is forcibly set. As a result, lean combustion can be avoided under running conditions requiring drive power, so that the vehicle power performance can be ensured as required.
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