Egr system with particle filter for a gasoline engine

Patent metadata

Field	Value
Publication number	US-2016177887-A1
Application number	US-201514721256-A
Country	US
Kind code	A1
Filing date	May 26, 2015
Priority date	Dec 17, 2014
Publication date	Jun 23, 2016
Grant date	—

Abstract

An exhaust gas recirculation system for a gasoline engine with an exhaust gas pipe connectible to an outlet manifold of a gasoline engine, with an inlet pipe connectible to an inlet manifold of a gasoline engine, whereas a main exhaust catalyst is provided within the exhaust gas pipe, wherein at least one first exhaust gas recirculation pipe is provided which branches off from the exhaust gas pipe and ends in the inlet pipe, whereas at least one particle filter is positioned within the first exhaust gas recirculation pipe and/or within the exhaust gas pipe upstream of the first exhaust gas recirculation pipe, whereas optionally a turbine is provided within the exhaust gas pipe, whereas as an alternative to the first exhaust gas recirculation pipe or in addition to the first exhaust gas recirculation pipe at least a second exhaust gas recirculation pipe is provided which branches off from the exhaust gas pipe and ends in the inlet pipe, whereas at least one particle filter is provided which is positioned within the second exhaust gas recirculation pipe and/or which is positioned within the exhaust gas pipe upstream of the second exhaust gas recirculation pipe.

First claim

What is claimed is:

1 . Exhaust gas recirculation system for a gasoline engine comprising: an exhaust gas pipe connectible to an outlet manifold of a gasoline engine, with an inlet pipe connectible to an inlet manifold of a gasoline engine, whereas a main exhaust catalyst is provided within the exhaust gas pipe,
wherein at least one first exhaust gas recirculation pipe is provided which branches off from the exhaust gas pipe and ends in the inlet pipe, whereas at least one particle filter is positioned
within the first exhaust gas recirculation pipe and/or
within the exhaust gas pipe upstream of the first exhaust gas recirculation pipe,
whereas optionally a turbine is provided within the exhaust gas pipe, whereas as an alternative to the first exhaust gas recirculation pipe or in addition to the first exhaust gas recirculation pipe at least a second exhaust gas recirculation pipe is provided which branches off from the exhaust gas pipe and ends in the inlet pipe, whereas at least one particle filter is provided
which is positioned within the second exhaust gas recirculation pipe and/or
which is positioned within the exhaust gas pipe upstream of the second exhaust gas recirculation pipe.

2 . Exhaust gas recirculation system according to claim 1 , wherein the second exhaust gas recirculation pipe branches off upstream or downstream of the exhaust catalyst whereas a coated particle filter is provided at the branch upstream.

3 . Exhaust gas recirculation system according to claim 1 , wherein at least one further exhaust gas recirculation pipe is provided which branches off at the first exhaust gas recirculation pipe and ends in the inlet pipe, whereas at least one cooler is provided within at least one of the further exhaust gas recirculation pipes.

4 . Exhaust gas recirculation system according to claim 3 , wherein the further exhaust gas recirculation pipe branches off downstream of the particle filter of the first exhaust gas recirculation pipe.

5 . Exhaust gas recirculation system according to claim 1 , wherein at least one particle filter has a coating with catalytic effect, converting CO, HC and/or NOx.

6 . Exhaust gas recirculation system according to claim 1 , wherein the main exhaust catalyst is positioned downstream of the branch of the first exhaust gas recirculation pipe or upstream of the branch of the second exhaust gas recirculation pipe or downstream of the branch of the second exhaust gas recirculation pipe.

7 . Exhaust gas recirculation system according to claim 6 , wherein at least one particle filter is free of a coating with catalytic effect, converting CO, HC and/or NOx and is positioned downstream of the main catalyst and optionally a further exhaust catalyst is positioned within the first exhaust gas recirculation pipe upstream of the respective particle filter.

8 . Exhaust gas recirculation system according to claim 1 , wherein at least one cooler is provided within the exhaust gas recirculation pipe and/or within the second exhaust gas recirculation pipe, downstream of at least one particle filter.

9 . Exhaust gas recirculation system according to claim 8 , wherein the cooler has an exhaust gas set temperature on an output side that ranges above a dew point of the substances contained in the exhaust gas.

10 . Exhaust gas recirculation system according to claim 9 , wherein at least one compressor is provided in the inlet pipe, whereas the first exhaust gas recirculation pipe branches off upstream of the turbine and ends upstream or downstream of the compressor and/or the second exhaust gas recirculation pipe branches off downstream of the turbine and ends upstream of the compressor.

11 . Exhaust gas recirculation system according to claim 10 , wherein at least one further exhaust gas recirculation pipe ends in the inlet pipe ahead of the compressor or behind the compressor.

12 . Exhaust gas recirculation system according to claim 3 , wherein two compressors are arranged within the inlet pipe, whereas at least one further exhaust gas recirculation pipe ends between both compressors.

13 . Exhaust gas recirculation system according to claim 3 , wherein two compressors are arranged within the inlet pipe and at least two further exhaust gas recirculation pipes are provided which are connected in parallel via a common supply pipe branching off at the first exhaust gas recirculation pipe, whereas at least one further exhaust gas recirculation pipe ends ahead of at least one of the compressors and/or at least one further exhaust gas recirculation pipe ends behind at least one of the compressors.

14 . Exhaust gas recirculation system according to claim 1 , wherein a charge air cooler and/or a charge air throttle valve are provided within the inlet pipe, whereas the opening of the first exhaust gas recirculation pipe is positioned downstream of a position of the charge air cooler and/or downstream of a position of the charge air throttle valve.

15 . Exhaust gas recirculation system according to claim 1 , wherein a charge air cooler and/or a charge air throttle valve are provided within the inlet pipe, whereas the opening of the first exhaust gas recirculation pipe is positioned upstream of a position of the charge air cooler.

16 . Exhaust gas recirculation system according to claim 15 , wherein as a supplement to the charge air cooler, a fresh air cooler is positioned in the inlet pipe, wherein the fresh air cooler is positioned upstream of the opening of the exhaust gas recirculation pipe.

17 . Exhaust gas recirculation system according to claim 16 , wherein the fresh air cooler has a fresh air set temperature Tf on the outlet side with 150°>=Tf>=90°.

18 . Exhaust gas recirculation system according to claim 3 , wherein a charge air cooler is provided in the inlet pipe, wherein the opening of at least one further exhaust gas recirculation pipe is positioned upstream of a position for the charge air cooler.

19 . Exhaust gas recirculation system according to claim 1 , wherein a throttle valve is provided in the first exhaust gas recirculation pipe and/or in the second exhaust gas recirculation pipe, by which an exhaust mass flow within the first exhaust gas recirculation pipe is adjustable depending on the operating point, whereas the throttle valve is positioned downstream or upstream of the particle filter.

20 . Exhaust gas recirculation system according to claim 19 , wherein at least one cooler is provided within the first exhaust gas recirculation pipe and/or within the second exhaust gas recirculation pipe, whereas the throttle valve is provided downstream or upstream of the cooler.

21 . Exhaust gas recirculation system according to claim 3 , wherein a further cooler is provided within the respective further exhaust gas recirculation pipe or that a further cooler is positioned in the supply pipe upstream of the respective further exhaust gas recirculation pipe.

22 . Exhaust gas recirculation system according to claim 1 , wherein the exhaust gas pipe has two parallel running exhaust pipe sections which are switchable via an adjustable valve, whereas the exhaust catalyst is positioned in the exhaust pipe section and the particle filter as well as the branch for a further exhaust gas recirculation pipe are provided in the parallel exhaust pipe section.

23 . Exhaust gas recirculation system according to claim 3 , wherein the second exhaust gas recirculation pipe and the further exhaust gas recirculation pipe are

Assignees

• Tenneco Gmbh

Inventors

• Fischer Michael

Classifications

• F02M26/04

  with a single turbocharger · CPC title

• F02M26/23

  Layout, e.g. schematics · CPC title

• F02P5/1516

  with means relating to exhaust gas recirculation, e.g. turbo · CPC title

• F02M26/42

  having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders · CPC title

• F02M26/35

  with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters · CPC title