DE102010017487A1 - Exhaust system for motor vehicle, has one or more exhaust lines, where exhaust particulate filter has filter disk mounted in radial or axial manner - Google Patents

Abstract

The exhaust system has one or more exhaust lines, where each exhaust line has an exhaust catalyst, a sound damper (10) and an exhaust particulate filter (15). The exhaust particulate filter has a filter disk (22) mounted in a radial or axial manner. Each filter disk is dimensioned such that a ratio of the axial dimension and radial dimension of each filter disk in less than 0.2.

Description

The invention relates to an exhaust system of a motor vehicle according to the preamble of patent claim 1.

From the DE 102007026812 A1 an exhaust system of a motor vehicle is known, wherein a first cylinder group of an internal combustion engine of the motor vehicle is associated with a first exhaust line of the exhaust system and a second cylinder group of the internal combustion engine of the motor vehicle, a second exhaust line of the exhaust system. Each exhaust system of the exhaust system comprises an exhaust gas catalyst and a downstream of the respective catalytic converter muffler. Furthermore, it is already known from this prior art that each exhaust system may comprise additional, additional modules, such as another muffler or an exhaust particulate filter.

From the DE 202008015325 U1 is designed as a catalytic converter or as an exhaust gas particulate filter exhaust purification device with a housing known, wherein a functional body for exhaust gas purification is mounted axially and radially in the housing. The radial bearing of the functional body in the housing is done using a bearing mat. The axial bearing of the functional body in the housing takes place by means of retaining rings. The functional body has an axial dimension greater than the radial dimension thereof. A ratio of axial dimension and radial dimension of the functional body is therefore according to this prior art more than one. Then, when the out of the DE 202008015325 U1 known exhaust gas purification device is designed as an exhaust gas catalyst, the functional body comprises a plurality of open on both sides, coated with a catalytic medium flow channels, which are traversed by the exhaust gas. On the other hand, if the exhaust gas purification device known from this prior art is embodied as an exhaust gas particle filter, channels of the functional element through which exhaust gas flows are closed on one side, so that the exhaust gas must flow through not only the channels but also a porous carrier medium of the functional element. Therefore, exhaust particulate filters have an increased flow resistance compared to exhaust catalysts, which is particularly disadvantageous when the exhaust system is to be used on a motor vehicle with a high-performance engine.

On this basis, the object of the present invention is to provide a novel exhaust system of a motor vehicle. This object is achieved by an exhaust system of a motor vehicle according to claim 1. According to the invention, the or each exhaust gas particulate filter in each case at least one filter disc, wherein the or each filter disc is mounted radially and axially, and wherein the or each filter disc is dimensioned such that a ratio of axial dimension and radial dimension of the respective filter disc less than 0.2 is.

With the present invention, an exhaust system is proposed for the first time, the exhaust particulate filter includes or include slender filter discs, ie those filter discs in which the ratio of the axial dimension and radial dimension of the respective filter disc is less than 0.2. Such filter discs allow effective filtering of exhaust particles in the exhaust particulate filter without appreciably increasing a flow resistance. Therefore, the exhaust system according to the invention is particularly suitable for use in high-performance engines.

Due to the fact that the or each filter disk of the or each exhaust gas particulate filter is made relatively slim, the respective exhaust particulate filter can be integrated into another assembly of the exhaust system. Accordingly, the exhaust particulate filter does not have to be designed as an independent subassembly, as is customary in the prior art.

Preferably, the ratio of the axial dimension and the radial dimension of the respective filter disk is between 0.01 and 0.1.

According to an advantageous development of the invention, the or each exhaust gas particulate filter is integrated in each case a silencer, namely in a defined by a housing of the respective silencer interior, wherein the or each filter disc is mounted radially and axially in the housing of the respective silencer. According to this advantageous embodiment of the invention, the space available by default in an exhaust system in the region of a muffler space is used to integrate an exhaust gas particulate filter in the muffler. This has the advantage that, despite the use of an exhaust gas particulate filter in the exhaust system, the installation space required by the exhaust system does not increase. This is particularly advantageous for sports cars with high performance engines.

Furthermore, if an exhaust particulate filter is integrated into a muffler of an exhaust system, the pressure loss caused by the exhaust particulate filter despite its slim design can be used advantageously. Thus, a reduced due to the integration of the exhaust particulate filter in the muffler silencer volume can be compensated by the internal damping of the exhaust filter. The exhaust particulate filter is then used in addition to the soundproofing.

Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:

1 a cross section through a detail of an emission control system according to the invention according to a first embodiment of the invention;

2 : a detail of 1 ; and

3 : A cross section through a detail of an exhaust gas purification system according to the invention according to a second embodiment of the invention.

The invention relates to an exhaust system of a motor vehicle with an internal combustion engine, in particular with an Otto internal combustion engine with direct fuel injection. The basic structure of an exhaust system is already known from the prior art. Thus, an exhaust system has at least one exhaust gas line, wherein the or each exhaust gas line comprises an exhaust gas catalytic converter, a silencer and an exhaust gas particulate filter. For the purposes of the present invention, it is proposed that each exhaust gas particulate filter of the exhaust system according to the invention has at least one filter disc which is mounted radially and axially, wherein the or each filter disc is dimensioned such that a ratio of axial dimension and radial dimension of the respective filter disc less than 0.2. According to the invention, slender filter discs are therefore used in an exhaust gas particulate filter, which have a relatively low flow resistance and thus cause a relatively low pressure loss in the exhaust gas flow. As a result, the exhaust system according to the invention is particularly suitable for use in high-performance engines.

Particularly preferably, the filter discs have a ratio of axial dimension and radial dimension, which is less than 0.1, wherein this ratio is preferably between 0.01 and 0.1. The use of such slender filter discs in exhaust particulate filters is particularly preferred.

The axial dimension of a filter disk is preferably to be understood as the axial thickness thereof. The radial dimension of a filter disk is preferably to be understood as the diameter thereof. Then, if no circular or round filter discs but non-circular such. B. angular filter discs are used, under the radial dimension of a filter disc is preferably to understand an equivalent diameter of a round filter disc with the same cross-sectional area as the non-circular filter disc.

Further details of the invention are described below with reference to 1 to 3 described for embodiments in which the or each exhaust particulate filter is integrated in each case a muffler of an exhaust system. So shows 1 a detail of an exhaust system according to the invention for a motor vehicle in the region of a muffler 10 the exhaust system, the muffler 10 Exhaust via an exhaust gas inlet pipe 11 is supplied, and exhaust gas being from the muffler 10 via an exhaust gas outlet pipe 12 is dissipated. The silencer 10 has a housing 13 which has an interior 14 of the muffler 10 Are defined. Abgaszuströmrohr 11 and exhaust gas discharge pipe 12 are on one side of the case 13 positioned.

In the interior 14 of the muffler 10 or in the housing 13 it is an exhaust particulate filter 15 integrated. The exhaust particulate filter 15 divided the interior 14 of the muffler 10 in the embodiment shown in two muffler chambers 16 and 17 ,

The exhaust inflow pipe 11 flows according to 1 into the muffler chamber 16 , The exhaust gas outlet pipe 12 rises in the second silencer chamber 17 passing over the exhaust particulate filter 15 from the first silencer chamber 16 is disconnected.

About the exhaust gas inlet pipe 11 into the muffler chamber 16 in the sense of the arrow 18 incoming exhaust gas experiences within the muffler chamber 16 in the sense of the arrows 19 a deflection and flows through in the direction of the arrows 20 the exhaust particulate filter 15 , whereby the exhaust gas from the muffler chamber 16 into the muffler chamber 17 arrives. Starting from the silencer chamber 17 then becomes the exhaust gas in the direction of the arrow 21 from the muffler 10 over the flue gas exhaust pipe 12 dissipated.

In the illustrated embodiment of the 1 includes the exhaust particulate filter 15 several filter discs 22 where each of the filter discs 22 in the case 13 of the muffler 10 is mounted radially and axially, and wherein each of the filter discs 22 has a ratio of axial dimension and radial dimension that is less than 0.2. Preferably, the ratio is less than 0.1.

How best 2 can be taken, which is a cut out 1 shows is every filter disc 22 mounted so radially that for the radial storage of the same at least radially outside and in 1 and 2 also radially in each case at least one radial bearing mat 23 to the filter disc 22 followed. Each filter disc 22 is together with the or each radial bearing mat 23 in a retaining ring 24 taken over a support ring 25 at least on the housing 13 of the muffler 10 supports, and in 2 additionally at the exhaust inflow pipe 11 ,

For axial storage of the filter discs 22 serve in the embodiment of 1 and 2 axial bearing mats 26 extending to either side of the respective filter disk 22 radially outside and radially inside in sections to the filter disc 22 connect, with the axial bearing mats 26 together with the radial bearing mats 23 and together the filter disc 22 together in the retaining ring 24 are included.

The filter discs 22 in the muffler 10 integrated exhaust particulate filter 15 are therefore in the muffler 10 mounted radially and axially. The exhaust particulate filter 15 divided from the housing 13 of the muffler 10 provided interior 14 into the muffler chambers 16 and 17 , The exhaust gas coming from the silencer chamber 16 into the muffler chamber 17 is transferred, must the exhaust particulate filter 15 namely, the filter discs 22 of the same, flow through.

Due to the fact that the filter discs 22 the exhaust particulate filter 15 are made relatively slim, so have a relatively small ratio of axial dimension and radial dimension, they have a relatively low flow resistance. However, a pressure loss caused by the same in the exhaust gas flow, which is caused by the flow resistance of the same, in the muffler 10 be used to advantage as a result of the integration of the exhaust particulate filter 15 in the muffler 10 reduced muffler volume via the internal damping of the exhaust particulate filter 15 to compensate.

In the bearing mats used for axial storage and radial storage 23 and 26 it is preferably storage mats of mineral fibers. The bearing mats can also be designed as knitted wire. The or each retaining ring 24 as well as support ring 25 the exhaust particulate filter 15 will as well as the case 13 of the muffler 10 preferably made of stainless steel by deep drawing. At the filter discs 22 the exhaust particulate filter 15 These are preferably ceramic filter discs, which are produced in the extrusion process by subsequent firing. Alternatively, as filter discs 22 also wound metal foils are used.

The outer shape of the filter discs 22 the exhaust particulate filter 15 is preferably to the shape of the housing 13 of the muffler 10 adapted to that of the housing 13 of the muffler 10 maximize the available cross section. In the embodiment of 1 and 2 are several filter discs, namely two filter discs 22 , existing axially outside of the Abgasausuströmrohrs 11 and radially inside the housing 13 of the muffler 10 are positioned and each above the support ring 25 on the one hand on the housing 13 of the muffler 10 and on the other hand at the Abgasausuströmrohr 11 support.

In contrast, shows 3 an embodiment in which of the housing 13 of the muffler 10 provided interior 14 an exhaust particulate filter 15 with a single filter disc 22 is integrated. In this case, then has the filter disc 22 via a preferably central recess or bore, through which then the Abgaszuströmrohr 11 extends, which from the same side of the housing 13 to the muffler 10 introduced as the exhaust gas exhaust pipe 12 ,

In this case, then the filter disk 22 the exhaust particulate filter 15 over the storage mats 26 and 23 only radially outwardly radially and axially mounted, in which case the support ring 24 only radially outside of the housing 13 of the muffler 10 supported, but not on Abgasausuströmrohr 11 ,

For supporting and storing the exhaust particulate filter 15 at the exhaust gas inlet pipe 11 serves in 3 a sealing element 27 , which on the one hand a seal of the filter disc 22 opposite the Abgasausuströmrohr 11 on the other hand, the filter disc 22 so on the exhaust gas inlet pipe 11 supports that a relative movement between the Abgaszuströmrohr 21 and sealing element 27 is possible, but a relative movement to the filter disc 22 is prevented.

The sealing element 27 thus leaves an axial movement of Abgasausuströmrohrs 11 relative to the sealing element 27 too, due to a different thermal expansion of Abgasausuströmrohr 11 and housing 13 of the muffler 10 can train.

As already stated, the sealing element leaves 27 Although this axial movement between Abgasausuströmrohr 11 and sealing element 27 but not between sealing element 27 and filter disc 22 to. This can cause erosion on the ceramic filter disc 22 be avoided.

To this axial movement between sealing element 27 and filter disc 22 to prevent, according to 3 the sealing element 27 on both sides via an axial collar, the filter disc 22 in the sealing element 27 axially fixed.

In both embodiments, both Abgasausuströmrohr based 11 as well as exhaust gas outlet pipe 12 on supporting floors 28 down to forces passing over the exhaust pipes 11 and 12 in the muffler 10 be initiated on the housing 13 derive the same, so that the or each filter disc 22 the exhaust particulate filter 15 is not burdened by these forces. As a result, a direct introduction of force via the Abgaszuströmrohr 11 on the or each break-sensitive filter disc 22 of the respective exhaust particulate filter 15 avoided.

In contrast to the exemplary embodiments shown, it is also possible that the Abgasausuströmrohr 11 and the Abgasabströmrohr 12 on different, opposite sides of the housing 13 are positioned. In this case, although the exhaust particulate filter divided 15 the interior 14 of the muffler 10 into the muffler chambers 16 and 17 , the exhaust particulate filter 15 However, none of the exhaust pipes 11 and 12 penetrated. It then eliminates the storage of the or each filter disc 22 at the exhaust gas inlet pipe 11 ,

In the exhaust system according to the invention is therefore in at least one silencer 10 an exhaust particulate filter 15 integrated. This makes it possible without additional space requirements, an exhaust system that has hitherto exclusively on at least one catalytic converter and at least one silencer to expand the function of an exhaust particulate filter. Due to the fact that according to the invention for the or each exhaust particulate filter 15 slim filter discs 22 are used in a relatively small ratio of axial dimension and radial dimension, results in a low pressure drop in the exhaust particulate filtering. Therefore, the exhaust system according to the invention is particularly suitable for use in high-performance engines.

LIST OF REFERENCE NUMBERS

10

silencer

11

Abgaszuströmrohr

12

Abgasabströmrohr

13

casing

14

inner space

15

exhaust particulate filter

16

exhaust chamber

17

exhaust chamber

18

exhaust gas flow

19

exhaust gas flow

20

exhaust gas flow

21

exhaust gas flow

22

filter disc

23

bearing mat

24

retaining ring

25

support ring

26

bearing mat

27

sealing element

28

support base

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102007026812 A1 [0002]
• DE 202008015325 U1 [0003, 0003]

Claims (11)

An exhaust system for a motor vehicle having an internal combustion engine, with at least one exhaust system, wherein the or each exhaust system comprises an exhaust gas catalytic converter, a silencer and an exhaust gas particulate filter, characterized in that the or each exhaust gas particulate filter ( 15 ) at least one filter disc ( 22 ), wherein the or each filter disc ( 22 ) is mounted radially and axially, and wherein the or each filter disc ( 22 ) is dimensioned such that a ratio of axial dimension and radial dimension of the respective filter disc ( 22 ) is less than 0.2. Exhaust system according to claim 1, characterized in that the ratio of axial dimension and radial dimension of the respective filter disc ( 22 ) is less than 0.1. Exhaust system according to claim 1 or 2, characterized in that the ratio of axial dimension and radial dimension of the respective filter disc ( 22 ) is between 0.01 and 0.1. Exhaust system according to one or more of claims 1 to 3, characterized in that the or each exhaust particulate filter ( 15 ) in each case a silencer ( 10 ), namely in one of a housing ( 13 ) of the respective silencer ( 10 ) defined interior ( 14 ), wherein the or each filter disc ( 22 ) in the housing ( 13 ) of the respective silencer ( 10 ) is mounted radially and axially. Exhaust system according to claim 4, characterized in that the or each filter disc ( 22 ) for radially supporting the same at least radially outside at least one radial bearing mat ( 23 ), wherein the or each filter disc ( 22 ) together with the or each radial bearing mat ( 23 ) in a retaining ring ( 24 ), which extends over a support ring ( 25 ) on the housing ( 13 ) of the respective silencer ( 10 ) is supported. Exhaust system according to claim 5, characterized in that the or each filter disc ( 22 ) for axially supporting the same on both sides of the same sections at least radially outside at least one axial bearing mat ( 26 ), wherein the or each filter disc ( 22 ) together with the or each axial bearing mat ( 26 ) and together with the or each radial bearing mat ( 23 ) in the retaining ring ( 24 ) is recorded. Exhaust system according to one of claims 4 to 6, characterized in that in the respective muffler ( 10 ) integrated exhaust particulate filter ( 15 ) the interior ( 14 ) thereof in at least two silencer chambers ( 16 . 17 ). Exhaust system according to one of claims 4 to 7, characterized in that a Abgaszuströmrohr ( 11 ) and an exhaust gas discharge pipe ( 12 ) on the same side of the housing ( 13 ) of the muffler ( 10 ), wherein the Abgasausuströmrohr ( 11 ) the exhaust particulate filter ( 15 ) penetrates and in a first muffler chamber ( 16 ), wherein the exhaust gas discharge pipe ( 12 ) in a second silencer chamber ( 17 ), and wherein the two muffler chambers ( 16 . 17 ) through the exhaust particulate filter ( 15 ) are separated from each other. Exhaust system according to claim 8, characterized in that the exhaust gas particulate filter ( 15 ) a single filter disc ( 22 ), wherein the Abgasausuströmrohr ( 11 ) through a preferably central opening of the filter disc ( 22 ), and wherein the filter disc ( 22 ) in the region of this opening with respect to the exhaust gas inflow pipe ( 11 ) via a sealing element ( 27 ), and wherein the sealing element ( 27 ) a relative movement to the Abgaszuströmrohr ( 11 ) but allows a relative movement to the filter disc ( 22 ) stops. Exhaust system according to claim 8, characterized in that the exhaust gas particulate filter ( 15 ) several filter discs ( 22 ), which around the Abgasausuströmrohr ( 11 ) are positioned around, wherein axial bearing mats ( 26 ) and radial bearing mats ( 23 ) radially inward and radially outward on the respective filter disk ( 22 ) to the storage of the same attack, and wherein the support ring ( 24 ) on the housing ( 13 ) of the respective silencer ( 10 ) and at the Abgasausuströmrohr ( 11 ) is supported. Exhaust system according to one of claims 1 to 10, characterized in that the internal combustion engine is an Otto internal combustion engine with direct fuel injection.

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