Combustion control apparatus for internal combustion engine
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United States of America Patent
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-
Mar 7, 2006
Grant Date -
Feb 24, 2005
app pub date -
Jul 21, 2004
filing date -
Jul 31, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A combustion control apparatus operates an internal combustion engine in a split retard combustion mode during regenerating an exhaust purifier such as a NOx trap. In the split retard combustion mode, the combustion control apparatus controls a first fuel injection to cause preliminary combustion at or near top dead center, and controls a second fuel injection to cause main combustion after an end of the preliminary combustion. In this manner, the combustion control apparatus controls an exhaust gas temperature, or an exhaust air-fuel ratio, without increasing exhaust smoke. During the split retard combustion mode, the combustion control apparatus controls a quantity of the first fuel injection, in accordance with an ignition lag of the preliminary combustion.
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