Apparatus for controlling engine
First Claim
1. An apparatus for controlling an engine which operates in a plurality of combustion modes and controls the quantity of intake air by throttle valve control means in accordance with each combustion mode, the apparatus comprising:
- throttle control means which varies the throttle opening from a throttle opening before mode switching to a target throttle opening after mode switching in step-wise fashion at the switching of combustion mode;
intake air response computation means which computes the response of intake air quantity based on the variation of opening of the throttle valve during the transition of combustion mode switching; and
modification means which modifies the quantity of fuel injection and the ignition timing in accordance with the response of intake air quantity computed by the intake air response computation means.
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Abstract
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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Citations
14 Claims
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1. An apparatus for controlling an engine which operates in a plurality of combustion modes and controls the quantity of intake air by throttle valve control means in accordance with each combustion mode, the apparatus comprising:
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throttle control means which varies the throttle opening from a throttle opening before mode switching to a target throttle opening after mode switching in step-wise fashion at the switching of combustion mode;
intake air response computation means which computes the response of intake air quantity based on the variation of opening of the throttle valve during the transition of combustion mode switching; and
modification means which modifies the quantity of fuel injection and the ignition timing in accordance with the response of intake air quantity computed by the intake air response computation means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification