Method for operating an exhaust gas treatment system having an SCR catalytic converter

US9353664B2 · kind B2 · utility

Assignee

• Daimler AG · DE

Inventors

• Bernd Christner · Altensteig, DE
• Uwe Hofmann · Würzburg, DE
• Alexander Kaiser · Neutraubling, DE
• Markus Paule · Bad Marienberg, DE

Key dates

• Filing date: Jul 22, 2009
• Grant date: May 31, 2016
• Expiry date: Nov 1, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Environmental technology
• WIPO sector: Chemistry

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.