Temperature control system for emission device coupled to direct injection engines
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United States of America Patent
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Jun 8, 1999
Grant Date -
N/A
app pub date -
Dec 22, 1997
filing date -
Dec 22, 1997
priority date (Note) -
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Abstract
A direct injection spark ignition engine is disclosed in which fuel is injected during a compression stroke of each combustion chamber for stratified mode operation. Additional fuel is injected into each combustion chamber during its exhaust stroke while operating in the stratified mode to provide an exotherm for heating the NOx trap in response to a low temperature indication. When total fuel injected into the combustion chamber exceeds a predetermined value, engine operation is switched from the stratified to the homogeneous mode.
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