Exhaust emission control device of internal combustion engine
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United States of America Patent
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-
Dec 3, 2002
Grant Date -
N/A
app pub date -
Dec 6, 2000
filing date -
Apr 6, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
An NO.sub.x sensor 27 detects the concentration of NO.sub.x released from an occlusion type NO.sub.x catalyst 25 into the atmosphere. Based on the output of the NO.sub.x sensor 27, a total NO.sub.x discharge A is computed. When the total NO.sub.x discharge A reaches an NO.sub.x emission judgment amount A.sub.0, corresponding to an NO.sub.x emission judgment amount designated by NO.sub.x emission regulations, before a distance traveled C reaches a predetermined distance traveled C.sub.0, an exhaust air-fuel ratio is changed to a rich air-fuel ratio to release NO.sub.x from the occlusion type NO.sub.x catalyst 25 efficiently. Then, the exhaust air-fuel ratio is changed to a stoichiometric air-fuel ratio to purify and reduce NO.sub.x by a three-way catalyst function.
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