Method and device for treating diesel exhaust gas

US6823667B2 · kind B2 · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Tillmann Braun · Winnenden, DE
• Oliver Ebelsheiser · Stuttgart, DE
• Bernd Krutzsch · Köngen, DE
• Klaus-Juergen Marquardt · Winnenden, DE
• Michel Weibel · Großburgwedel, DE
• Guenter Wenninger · Stuttgart, DE

Key dates

• Filing date: Feb 10, 2003
• Grant date: Nov 30, 2004
• Expiry date: Feb 10, 2023

Classification

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

Abstract

In a method for burning deposited soot particles in a particle filter on an exhaust device of a diesel engine, first of all, in a known way, a catalytic converter produces NO2 from exhaust gas. This NO2 reduces the ignition temperature of soot to such an extent that it burns at normal exhaust-gas temperature. Furthermore, there is provision to add fuel additive, which likewise allows the ignition temperature of the soot to be reduced. The sulphur content in the fuel is determined, and either generation of NO2 or the addition of additive is used as a function of this measurement. This preferably takes place automatically. To determine the sulphur content, it is possible, for example, to use a sulphur sensor in the tank.