Exhaust gas system for internal combustion engines

US4287716A · kind A · utility

Assignee

• Daimler-Benz AG · DE

Inventors

• Hans-Dieter Schuster · Schorndorf, DE
• Karl Jans · Wissen, DE
• Rolf Ohlendorf · Waiblingen, DE

Key dates

• Filing date: Mar 5, 1980
• Grant date: Sep 8, 1981
• Expiry date: Mar 5, 2000

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01N2430/02
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

An exhaust gas system for a multi-cylinder internal combustion engine, in which some cylinders are adapted to be effectively disconnected; the exhaust gas system includes in a common exhaust line, an O.sub.2 -probe and two series-connected catalysts while a separate exhaust gas line is coordinated to the cylinders adapted to be effectively disconnected; a control member operable as a function of load opens three separate branch connections from the separate exhaust line to the common exhaust line in such a manner that when all cylinders are firing, the branch connection terminating upstream of the O.sub.2 -probe is opened; the branch terminating in the common exhaust line between the O.sub.2 -probe and the first of the series-connected catalysts is opened when at least one of the cylinders is effectively disconnected and when the internal combustion engine is still relatively cold or warms up to a middle temperature; at temperatures exceeding the middle operating temperature, the branch connection terminating between the two catalysts is opened.