Method for operating an exhaust gas treatment system having an SCR catalytic converter
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United States of America Patent
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May 31, 2016
Grant Date -
May 19, 2011
app pub date -
Jul 22, 2009
filing date -
Aug 7, 2008
priority date (Note) -
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Abstract
In a system with an SCR catalytic converter, a correction by a changeable long term adaption factor to a target dosing rate is provided for the model dosing rate and a correction by a changeable short term adaption factor to an assumed actual filling state for the ammonia filling level value. A dosing unit controllable by a control unit adds an ammonia-containing reducing agent to the exhaust gas and an exhaust gas enriched with ammonia according to the dosing is fed to the SCR catalytic converter. An ammonia filling level value for a filling level of ammonia stored in the SCR catalytic converter and a model dosing rate for dosing the reducing agent into the exhaust gas are calculated by a computer model.
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