Internal combustion engine control with fast exhaust catalyst warm-up
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United States of America Patent
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Nov 2, 1999
Issued Date -
N/A
app pub date -
Oct 8, 1998
filing date -
Sep 18, 1995
priority date (Note) -
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Abstract
In an engine exhaust catalyst warm-up control, an ignition timing is delayed than normal first to raise the catalyst temperature, and then a fuel injection amount is dithered to increase and decrease alternately from a normal amount until the catalyst temperature reaches the catalyst activation completion temperature. In place of the ignition delay control, afterburning control may be employed in which fuel cut for a cylinder and fuel increase for the other cylinders are executed. Further, the catalyst warm-up control may be performed by controlling a supercharging operation and an exhaust gas recirculation operation cooperatively.
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