Exhaust gas system with two exhaust gas treatment units

US7597859B2 · kind B2 · utility

Assignee

• EMITEC Gesellschaft fuer Emissionstechnologie mbH · DE

Inventors

• Rolf Brück · Bensberg, DE
• Andreas Scheeder · Siegburg, DE

Key dates

• Filing date: Sep 24, 2007
• Grant date: Oct 6, 2009
• Expiry date: Sep 24, 2027

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01N2330/48
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

An exhaust gas system for an internal combustion engine includes a first exhaust treatment unit with a first back pressure and a second exhaust treatment unit with a second back pressure being higher than the first back pressure. The system advantageously enables the configuration of systems having two exhaust treatment units that are disposed one behind the other in flow direction. The first and/or second exhaust treatment unit can have a smaller construction due to the homogenization of flow. This applies, for example, when an oxidation-type catalytic converter is provided as the first exhaust treatment unit and when a particulate filter is provided as the second exhaust treatment unit. The homogenization of flow in the first exhaust treatment unit increases the conversion rate so that the first and/or second exhaust treatment unit can be provided with a smaller construction. This saves considerable costs when configuring such systems.