Exhaust gas system for an internal combustion engine

• US 10,458,298 B2
• Filed: 03/20/2015
• Issued: 10/29/2019
• Est. Priority Date: 08/01/2014
• Status: Active Grant

• Current Assignee: Audi AG (Volkswagen AG)
• Original Assignee: Audi AG (Volkswagen AG)
• Inventors: Peters, Axel
• Primary Examiner(s): Bradley, Audrey K
• Assistant Examiner(s): Singh, Dapinder
• Application Number:
  US15/329,475
• Publication Number:
  US 20170211439A1
• Time in Patent Office: 1,684 Days
• Field of Search: 60312, 60322, 60324
• CPC Class Codes: F01N 1/02 by using resonance
• CPC Class Codes: F01N 1/023 Helmholtz resonators
• CPC Class Codes: F01N 1/161 for adjusting resonance or dead chambers or passages to resonance or dead chambers
• CPC Class Codes: F01N 13/02 having two or more separate silencers in series
• CPC Class Codes: F01N 13/04 having two or more silencers in parallel, e.g. having interconnections for multi-cylinder engines
• CPC Class Codes: F01N 2470/14 Plurality of outlet tubes, e.g. in parallel or with different length
• CPC Class Codes: F01N 2470/20 Dimensional characteristics of tubes, e.g. length, diameter
• CPC Class Codes: F01N 2490/00 Structure, disposition or shape of gas-chambers

Abstract

An exhaust gas system for an internal combustion engine includes a first exhaust gas line leading into a first muffler; a second exhaust gas line arranged fluidly parallel to the first exhaust gas line and leading into a second muffler, wherein the first and second exhaust gas lines are respectively connected upstream of the first and second muffler at a branch to a common exhaust gas feed line; a control valve arranged in the first exhaust gas line upstream of the first muffler; and a damping device fluidly arranged between the branch and the control valve and adapted for damping exhaust gas resonance vibrations.

Claims

1. An exhaust gas system for an internal combustion engine comprising:

a first exhaust gas line leading into a first muffler;

a second exhaust gas line arranged fluidly parallel to the first exhaust gas line and leading into a second muffler, said first and second exhaust gas lines respectively being connected upstream of the first and second muffler at a branch to a common exhaust gas feed line;

a control valve arranged in the first exhaust gas line upstream of the first muffler;

a damping device fluidly arranged between the branch and the control valve and adapted for damping exhaust gas resonance vibrations, said damping device including a housing having an entry end and an exit end for the exhaust gas in a flow direction, and at least one nozzle arranged within the housing in the flow direction of the exhaust gas at a downstream location of the housing in proximity of the exit end; and

a cross section adjustment element provided in a flow connection between the first exhaust gas line and the second exhaust gas line.

2. The exhaust gas system of claim 1, wherein the damping device has a sound absorber.

3. The exhaust gas system of claim 2, wherein the sound absorber is constructed as a resonance absorber.

4. The exhaust gas system of claim 1, wherein the cross section adjustment element is constructed as a spring-loaded check valve.

5. The exhaust gas system of claim 1, wherein the at least one nozzle leads into an open-jet volume.

6. The exhaust gas system of claim 1, wherein the second exhaust gas line is configured without a control valve.

7. The exhaust gas system of claim 1, further comprising an exhaust gas turbocharger provided upstream of the branch.

8. The exhaust gas system of claim 1, wherein the nozzle is configured such as to cause a reduction of a flow cross section in the flow direction and to lead into an open-jet volume to thereby effect an increase of the flow cross section in the flow direction.