Exhaust gas purifying system for engine
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United States of America Patent
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Apr 27, 2004
Grant Date -
Aug 1, 2002
app pub date -
Aug 20, 2001
filing date -
Aug 22, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An exhaust purifying system includes switching between a stratified combustion state at a stratified combustion region (I) of low revolutions speeds and low loads and a homogeneous combustion state of substantially the theoretical air/fuel ratio at a warm .lambda.=1 region (II) adjacent thereto with higher revolution speeds or loads, wherein a first oxygen concentration sensor is arranged upstream from the three-way catalyst, and when an engine shifts from the stratified combustion region (I) to the warm .lambda.=1 region (II), the feedback control of the air/fuel ratio based on an output signal of that sensor begins, and the target air/fuel ratio A/F is set to a range of 14.0.ltoreq.A/F<14.7, so that the target air/fuel ratio A/E is slightly richer than the theoretical air/fuel ratio, thus preventing a temporary deterioration of the exhaust gas state.
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