Control device for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsMamoru Yoshioka, Yasuyuki Takama
Life of this patent
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Abstract
The valve timing is changed to increase the internal EGR amount the moment a fuel cut process begins (FIG. 2C). Before a sufficient amount of internal EGR is obtained, control is exercised so that the throttle-opening angle TA is larger than a basic idle-opening angle TA0. When a sufficient amount of internal EGR is obtained, control is exercised so that the throttle-opening angle TA is smaller than the basic idle-opening angle TA0 (FIG. 2D). The increase in the internal EGR amount is rendered smaller during fuel cut at a low rotation speed than during fuel cut at a high rotation speed. In addition, the amount of decrease in the throttle-opening angle TA is rendered smaller during fuel cut at a low rotation speed than during fuel cut at a high rotation speed.
Claims20
A control device for an internal combustion engine, the control device comprising:
- fuel cut means for cutting off fuel when the internal combustion engine decelerates;
- EGR control means for providing a larger exhaust gas recirculation amount during fuel cut at a high engine speed than during fuel cut at a low engine speed;
- and
- intake air amount control means for providing a smaller intake air amount during fuel cut at a high engine speed than during fuel cut at a low engine speed.
Dependencies are inferred from the claim text.