Device for removing nitrogen oxides from internal combustion engine waste gas and method for dosing an aggregate of internal combustion engine waste gas

US8061122B2 · kind B2 · utility

Assignee

• Daimler AG · DE

Inventors

• Marc Chaineux · Stuttgart, DE
• Bernd Christner · Altensteig, DE
• Nicholas M. G. Fekete · Richardson, US
• Berthold Keppeler · Owen, DE
• Markus Paule · Bad Marienberg, DE

Key dates

• Filing date: Mar 14, 2006
• Grant date: Nov 22, 2011
• Expiry date: Aug 3, 2028

Classification

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

Abstract

In a device and a method for removing nitrogen oxides from the exhaust of an internal combustion engine which is operated predominantly with an excess of air, the internal combustion engine is assigned an exhaust system having a nitrogen oxide reduction catalytic converter which comprises two catalytic converter parts, whose reducing agent filling levels can be determined. Metering of a reducing-agent-containing additive into the exhaust gas of the internal combustion engine takes place as a function of the reducing agent filling level of the first catalytic converter part and/or of the second catalytic converter part.