Piston-type internal combustion engine having two groups of cylinders one of which being selectively inoperative and means for supplying exhaust gas to the catalytic converter of the inoperative group

US5782088A · kind A · utility

Assignee

• Mercedes-Benz Group AG · DE

Inventors

• Josef Gunther · Marbach am Neckar, DE
• Roland Kemmler · Stuttgart, DE
• Herbert Klein · Kiel, DE
• Uwe Kleinecke · Winnenden, DE
• Wolfgang Oehler · Stuttgart, DE

Key dates

• Filing date: Mar 10, 1997
• Grant date: Jul 21, 1998
• Expiry date: Mar 10, 2017

Classification

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

Abstract

In an internal combustion engine with at least two groups of cylinders of which each has an exhaust pipe with a catalytic converter and of which one group can be shut down so that it is inoperative during part-load engine operation, the exhaust pipes are joined downstream of the catalytic converters by a common pipe section, and vacuum generating means are provided for subjecting the exhaust pipe of the inoperative cylinder group upstream of its catalytic converter during part load operation when the one cylinder group is shut down to vacuum for pulling exhaust gas from the common pipe section into the catalytic converter of the inoperative cylinder group.