Exhaust discharge control device for internal combustion engine
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United States of America Patent
Stats
-
May 22, 2001
Grant Date -
N/A
app pub date -
Aug 5, 1999
filing date -
Aug 28, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An NO.sub.x absorbent is arranged in an engine exhaust passage absorbs NO.sub.x when the air-fuel ratio of inflowing exhaust gas is lean and discharges absorbed NO.sub.x or SO.sub.x when the oxygen concentration of inflowing exhaust gas decreases. When the air-fuel ratio of the exhaust gas flowing into the NO.sub.x absorbent is rich, previously absorbed NO.sub.x or SO.sub.x is discharged from the NO.sub.x absorbent. When NO.sub.x or SO.sub.x is to be discharged from the NO.sub.x absorbent, oxygen is left in the exhaust gas flowing into the NO.sub.x absorbent and the oxygen concentration of this exhaust gas is maintained within a predetermined range.
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