Emission control system for an internal-combustion engine

US6170259A · kind A · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Walter Boegner · Waiblingen, DE
• Karl-Ernest Haak · Lichtenwald, DE
• Bernd Krutzsch · Köngen, DE
• Dirk Voigtlaender · Ditzingen, DE
• Guenter Wenninger · Stuttgart, DE
• Friedrich Wirbeleit · Eßlingen, DE

Key dates

• Filing date: Oct 29, 1998
• Grant date: Jan 9, 2001
• Expiry date: Oct 29, 2018

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01N2610/08
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

An emission control system for an internal-combustion engine has at least one nitrogen oxide adsorber for the periodic adsorption and desorption of nitrogen oxides contained in the exhaust gas of the internal-combustion engine. A desorption gas pipe has an externally heatable catalyst arranged therein to which a mixture of air and/or exhaust gas can be fed as well as fuel at an at least stoichiometric proportion. This mixture is burned to form a desorbing gas flow which is fed to the respective nitrogen oxide adsorber for the nitrogen oxide desorption.