Exhaust gas purification apparatus and method for an internal combustion engine
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United States of America Patent
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Feb 18, 2003
Grant Date -
May 9, 2002
app pub date -
Nov 12, 1999
filing date -
Jun 10, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In order to suppress the quantity of the nitrogen oxide to be released to the atmosphere when the operation state is shifted from the engine operation with lean air fuel ratio to that with stoichiometric air fuel ratio, the exhaust gas purification apparatus is arranged such that by forced rich operation, when the operation state is shifted from the engine operation with lean air fuel ratio to that with stoichiometric air fuel ratio, the operation state is shifted to the engine operation with stoichiometric air fuel ratio after performing that with rich air fuel ratio.
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