Method for operating a multicylinder internal combustion engine

US6082100A · kind A · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Walter Boegner · Waiblingen, DE
• Frank Duvinage · Kirchheim unter Teck, DE
• Walter Friess · Stuttgart, DE
• Karl-Ernst Haak · Lichtenwald, DE
• Bernd Krutzsch · Köngen, DE
• Rudolf Maly · Sindelfingen, DE
• Viktor Pfeffer · Esslingen am Neckar, DE
• Stefan Pischinger · Aachen, DE
• Gregor Renner · Stuttgart, DE
• Dirk Voigtlaender · Ditzingen, DE
• Michel Weibel · Großburgwedel, DE
• Guenter Wenninger · Stuttgart, DE
• Friedrich Wirbeleit · Eßlingen, DE

Key dates

• Filing date: Oct 29, 1998
• Grant date: Jul 4, 2000
• Expiry date: Oct 29, 2018

Classification

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

Abstract

A method for operating a multicylinder internal combustion engine with at least one adsorber catalytic converter in the exhaust line of the internal combustion engine includes operating the adsorber catalytic converter with periodically alternating adsorption and desorption operation. The exhaust leaving the adsorber catalytic converter in desorption operation is recycled and/or an oxidation catalytic converter is provided upstream of the adsorber catalytic converter. Exhaust recycling takes place occurs selectively in only one set of the cylinders of the internal combustion engine and this set of cylinders is operated in a state of incomplete combustion during desorption operation. Rich afterburning may be performed during desorption operation of the adsorber catalytic converter in the oxidation catalytic converter connected upstream and the oxidation catalytic converter is operated at an increased temperature during short regeneration phases to remove soot.