Internal combustion engine exhaust emission control system with adsorbers for nitrogen oxides

US5910097A · kind A · utility

Assignee

• Daimler-Benz AG · DE

Inventors

• Walter Boegner · Waiblingen, DE
• Karl-Ernst Haak · Lichtenwald, DE
• Bernd Krutzsch · Köngen, DE
• Wim Verrelst · Edegem, BE
• Dirk Voigtlaender · Ditzingen, DE
• Guenter Wenninger · Stuttgart, DE
• Friedrich Wirbeleit · Eßlingen, DE

Key dates

• Filing date: Jul 17, 1997
• Grant date: Jun 8, 1999
• Expiry date: Jul 17, 2017

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01N2410/12
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A motor vehicle exhaust emission control system has two adsorber parts connected in parallel for alternate adsorption and desorption of nitrogen oxides contained in the exhaust from an internal combustion engine and components for conducting further downstream the exhaust that emerges in the adsorber part that is operating at any given time in the adsorption mode and for returning the exhaust that emerges from the other adsorber part that is then operating in the desorption mode, to an intake line of the engine. An oxidizing converter is located upstream of the adsorber part and near the engine for oxidation of the NO contained in the exhaust to form NO.sub.2, so as to permit an increase in the NO.sub.X adsorption rate for the nitrogen adsorber parts.