Exhaust gas purifying apparatus of internal combustion engine
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United States of America Patent
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Oct 31, 2006
Issued Date -
N/A
app pub date -
Nov 10, 1998
filing date -
Nov 10, 1997
priority date (Note) -
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Abstract
An exhaust gas purifying apparatus of an internal combustion engine is provided which includes: exhaust gas purifying means, provided in an exhaust passage of the engine, for adsorbing NO.sub.x in an exhaust gas when the air-fuel ratio of the exhaust gas is lean. The exhaust gas apparatus releases or reduces the adsorbed NO.sub.x when the oxygen concentration of the exhaust gas is reduced. A light-off catalyst is provided upstream of the exhaust gas purifying apparatus in the exhaust passage, which has a lower O.sub.2 storage capability than the exhaust gas purifying apparatus. There is a control device for controlling the air-fuel ratio of the exhaust gas so that an atmosphere having a reduced oxygen concentration is produced around the exhaust gas purifying apparatus when the NO.sub.x conversion efficiency of the exhaust gas purifying apparatus is decreased.
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