Method of operating an exhaust gas cleaning unit with particle filter and nitrogen oxygen store

US7662197B2 · kind B2 · utility

Assignee

• Daimler AG · DE

Inventors

• Frank Duvinags · Kirchheim unter Teck, DE
• Stefan Kurze · Brunsbüttel, DE
• Thomas Liebscher · Fellbach, DE
• Arno Nolte · Stuttgart, DE
• Markus Paule · Bad Marienberg, DE
• Norbert Ruzicka · Steinenbronn, DE
• Joachim Schommers · Backnang, DE

Key dates

• Filing date: Jan 7, 2008
• Grant date: Feb 16, 2010
• Expiry date: Feb 20, 2028

Classification

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

Abstract

In a method for operating an exhaust-gas cleaning unit of a diesel engine including a particle filter and a nitrogen oxide storage device arranged upstream of the particle filter, wherein sulfur regeneration of the nitrogen oxide storage device is performed periodically at raised exhaust gas temperatures and, in certain phases, with a rich exhaust gas composition, and also soot regeneration of the particle filter is performed at raised exhaust gas temperatures with a lean exhaust gas composition, at least some of the sulfur regeneration and the soot regeneration phases are performed in a combined soot and sulfur regeneration phase, and for the sulfur regeneration, at least temporarily, a rich exhaust-gas composition with a temperature higher than the temperature of the lean exhaust gas composition is provided for the soot regeneration of the particle filter.