| 摘要 |
An apparatus for controlling an engine responds to the switching of combustion mode from stoichiometric combustion to lean-fuel combustion to vary the target throttle opening in step-wise fashion, causing the quantity of intake air to increase in a fashion of first-order delay. The base fuel injection quantity and base ignition timing are computed based on the response of intake air quantity. Consequently, the torque shock can be reduced and the quick combustion mode switching can be performed. Based on the quick passage of the air-fuel ratio zone in which a large amount of NOx arises, the amount of NOx emission can be reduced.
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