Exhaust gas aftertreatment installation and method

US7814747B2 · kind B2 · utility

Assignee

• Daimler AG · DE

Inventors

• Brigitte Bandl-Konrad · Göppingen, DE
• Andreas Hertzberg · Markgröningen, DE
• Bernd Krutzsch · Köngen, DE
• Arno Nolte · Stuttgart, DE
• Markus Paule · Bad Marienberg, DE
• Stefan Renfftlen · Eislingen/Fils, DE
• Norbert Waldbuesser · Stuttgart, DE
• Michel Weibel · Großburgwedel, DE
• Guenter Wenninger · Stuttgart, DE
• Rolf Wunsch · Malsch, DE

Key dates

• Filing date: Mar 23, 2007
• Grant date: Oct 19, 2010
• Expiry date: Jun 5, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

An exhaust gas aftertreatment installment and associated exhaust gas aftertreatment method utilizes a nitrogen oxide storage catalytic converter and an SCR catalytic converter. A particulate filter is provided upstream of the nitrogen oxide storage catalytic converter or between the latter and the SCR catalytic converter or downstream of the SCR catalytic converter. The time of regeneration operating phases of the nitrogen oxide storage catalytic converter can be determined as a function of the nitrogen oxide content of the exhaust gas downstream of the nitrogen oxide storage catalytic converter or of the SCR catalytic converter and/or as a function of the ammonia loading of the latter. Moreover, a desired ammonia generation quantity can be determined for a respective regeneration operating phase. The installation and method are adopted for use for motor vehicle internal combustion engines and other engines which are operated predominantly in lean-burn mode.