Method for the catalytic conversion of nitrogen oxides contained in the exhaust gas of an internal combustion engine
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United States of America Patent
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-
Oct 29, 2002
Grant Date -
Jun 13, 2002
app pub date -
Jul 19, 2001
filing date -
Jan 19, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method is provided for the catalytic conversion of nitrogen oxides contained in the exhaust gas of an internal combustion engine. A reducing agent is added in a controlled manner upstream of a denitrification catalyst, as seen in exhaust gas flow direction, and in dependence on a nitrogen oxide concentration. The reducing agent is added in a superstoichiometric amount in relation to the nitrogen oxide content if an operating parameter and/or a value derived from the operating parameter falls below or exceeds a threshold value. The addition of the reducing agent is then terminated or continued in a substoichiometric manner. The invention provides a measure for obtaining an extremely high average nitrogen oxide conversion, especially under varying operating conditions of the internal combustion engine.
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