Exhaust gas purification device for an engine
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United States of America Patent
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Dec 5, 1995
Issued Date -
N/A
app pub date -
Nov 14, 1994
filing date -
Aug 4, 1992
priority date (Note) -
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Abstract
An engine comprising an exhaust passage having therein a NO.sub.x absorbent which absorbs the NO.sub.x when the air-fuel ratio of the exhaust gas flowing into the NO.sub.x absorbent is lean and releases the absorbed NO.sub.x when the air-fuel ratio of the exhaust gas flowing into the NO.sub.x absorbent becomes the stoichiometric air-fuel ratio or rich. A sulphur trapping device for trapping SO.sub.x contained in the exhaust gas is arranged in the exhaust passage upstream of the NO.sub.x absorbent.
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