Exhaust purification apparatus of internal combustion engine
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United States of America Patent
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Sep 11, 2012
Grant Date -
Feb 18, 2010
app pub date -
Nov 8, 2007
filing date -
Nov 10, 2006
priority date (Note) -
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Abstract
An internal combustion engine wherein exhaust gas from the cylinder groups (1, 2) is supplied to a common NOx storage catalyst (12). When the NOx storage catalyst (12) should release the SOx, the average air-fuel ratio of one cylinder group (1) is made rich and the average air-fuel ratio of the other cylinder group (2) is made lean. At this time, the air-fuel ratios of the cylinders (3) of one cylinder group (1) are made one target rich air-fuel ratio selected from two predetermined target rich air-fuel ratios, while the air-fuel ratios of the cylinders (3) of the other cylinder group (2) are made one target lean air-fuel ratio selected from two predetermined target lean air-fuel ratios.
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