Exhaust gas treatment method and device
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United States of America Patent
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Sep 13, 2005
Grant Date -
N/A
app pub date -
Sep 8, 2000
filing date -
Sep 8, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of treating NOx emmissions in the exhaust gas of an internal combustion engine having catalyst means including at least a first catalyst converter capable of treating NOx, the method including operating the engine in a first mode to promote a first set of conditions and in a second mode to promote a second set of conditions, wherein the first mode of operation includes operating the engine with a lean air-fuel ratio, and the second mode of operation includes operating the engine with a stoichiometic air-fuel ratio.
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