EXHAUST SYSTEM FOR AN INTERNAL COMBUSTION ENGINE

• US 20140166394A1
• Filed: 12/13/2013
• Published: 06/19/2014
• Est. Priority Date: 12/17/2012
• Status: Active Grant

• Current Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Original Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Inventors: Winkel, Joerg
• Granted Patent: US 9,109,483 B2
• Time in Patent Office: Days
• US Class Current: 181/228
• CPC Class Codes: F01N 1/02 by using resonance
• CPC Class Codes: F01N 1/166 for changing gas flow path through the silencer or for adjusting the dimensions of a chamber or a pipe F01N1/165 takes precedence
• CPC Class Codes: F01N 13/107 More than one exhaust manifold or exhaust collector
• CPC Class Codes: F01N 2240/36 an exhaust flap

Abstract

An exhaust system for an internal combustion engine, having a first exhaust tract and a second exhaust tract, wherein a first silencer device is arranged in an end section of the first exhaust tract and a second silencer device is arranged in an end section of the second exhaust tract, and the two exhaust tracts are connected in an inter-communicating manner by a crosstalk point, and, in the first or second exhaust tract downstream of the crosstalk point, there is provided a valve for the selective closure of the respective exhaust tract, wherein a distance between the valve and the crosstalk point is dimensioned such that, at a particular rotational speed of the engine, an exhaust line path between the valve and the crosstalk point serves as a quarter lambda resonator such that, at the rotational speed of the internal combustion engine, disturbing noises of the exhaust system are reduced.

Claims

1. An exhaust system for an internal combustion engine, having a first exhaust tract and having a second exhaust tract, wherein a first silencer device is arranged in an end section of the first exhaust tract and a second silencer device is arranged in an end section of the second exhaust tract, and the two exhaust tracts are connected in an inter-communicating manner at a crosstalk point, and, in the first or second exhaust tract downstream of the crosstalk point, there is provided a valve for the selective closure of the respective exhaust tract, wherein a distance between the valve and the crosstalk point is dimensioned such that, at a pre-determined rotational speed or speed range of the internal combustion engine, an exhaust line path between the valve and the crosstalk point serves as a quarter lambda resonator such that, at said rotational speed of the internal combustion engine, disturbing noises of the exhaust system are reduced.

2. The exhaust system as claimed in claim 1, wherein the valve is in the form of an exhaust-gas flap.

3. The exhaust system as claimed in claim 1, wherein the crosstalk point is in the form of a third silencer device.

4. The exhaust system as claimed in claim 1, wherein the crosstalk point is in the form of a connecting pipe.

5. The exhaust system as claimed in claim 4, wherein an exhaust-gas flap is provided in the connecting pipe or within the third silencer device.

6. The exhaust system as claimed in claim 1, wherein the valve is configured to be actuated as a function of engine load and/or rotational speed of the internal combustion engine.