Internal combustion engine exhaust system

US5277026A · kind A · utility

Assignee

• Mercedes-Benz Group AG · DE

Inventors

• Wolf Boll · Waiblingen, DE
• Reinhard Steinkamper · Winnenden, DE
• Karl-Heinz Kempka · Eßlingen, DE
• Karl Zeilinger · Winnenden, DE

Key dates

• Filing date: Feb 8, 1993
• Grant date: Jan 11, 1994
• Expiry date: Feb 8, 2013

Classification

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

Abstract

In an exhaust system for an internal combustion engine having a main exhaust conduit with a catalytic converter arranged remote from the engine and a bypass exhaust conduit which includes a start-up catalytic converter arranged close to the engine and joins the main exhaust gas conduit ahead of said remote catalytic converter, an ejector structure is arranged in the main exhaust gas conduit within a housing defining a suction chamber in communication with the bypass exhaust conduit for drawing gas through the bypass exhaust conduit into said main exhaust gas conduit whenever exhaust gas flows from the engine through the main exhaust gas conduit and a main exhaust conduit valve is arranged between the ejector structure and the junction of the main and the bypass exhaust conduits which is closed during start-up operation of the engine to thereby force the exhaust gas to flow through the suction chamber and the bypass exhaust gas conduit via the start-up catalytic converter.