DE102015002432A1 - Exhaust after-treatment device for an internal combustion engine of a motor vehicle - Google Patents

Abstract

The invention relates to an exhaust aftertreatment device for an internal combustion engine of a motor vehicle, comprising at least one exhaust gas guide element (10) which has at least one exhaust gas passage (12) through which the exhaust gas of the internal combustion engine can flow, with a metering device (16) by means of which at least one feed point (18) Reducing agent for Entsticken the exhaust gas in the exhaust passage (12) can be introduced, and with a in the exhaust passage (12) arranged flow divider (28), by means of which the exhaust passage (12) in a by a first partial flow of the exhaust flow-through first sub-channel (30) and a second sub-channel (32) through which a second partial flow of the exhaust gas can flow, in which the feed point (18) is arranged, wherein the flow-splitting element (28) has a channel region through which the first partial flow can flow and which widens in the flow direction of the first partial flow ( 38) t, wherein in the second sub-channel (32) in the second flow divider (46) is arranged, through which the second sub-channel (32) in a by a first undercurrent of the exhaust gas-permeable, first sub-channel (48), one of a second underflow (84 ), the second sub-channel (50) through which the exhaust gas can flow, in which the feed point (18) is arranged, and between the first sub-channel (48) and the second sub-channel (50) can be flowed through by a third underflow (86) of the exhaust gas, the second flow divider element (46) has a second channel region (54) which can be flowed through by the second and third underflows (84, 86) and which widens in the flow direction of the second and third underflows (84, 86). having.

Description

The invention relates to an exhaust aftertreatment device for an internal combustion engine of a motor vehicle according to the preamble of patent claim 1.

Such an exhaust aftertreatment device for an internal combustion engine of a motor vehicle is already the US 2010/0005791 A1 to be known as known. The exhaust gas aftertreatment device comprises at least one exhaust gas guide element which has at least one exhaust gas passage through which exhaust gas of the internal combustion engine can flow. The exhaust guide element thus serves to guide the exhaust gas.

Furthermore, the exhaust aftertreatment device comprises a metering device, by means of which at at least one feed point, a reducing agent for Entsticken the exhaust gas in the exhaust duct can be introduced. Further, a arranged in the exhaust passage flow dividing element is provided, by means of which the exhaust duct is divided into a first sub-channel and a second sub-channel.

The first partial passage can be traversed by a first partial flow of the exhaust gas, wherein the second partial passage can be traversed by a second partial flow of the exhaust gas. In other words, the exhaust gas or a total flow of the exhaust gas is divided by means of the flow dividing element into the first partial flow and the second partial flow, wherein the first partial flow flows through the corresponding first partial channel and the second partial flow through the corresponding second partial channel. In this case, the flow-dividing element has a channel region, through which the first partial flow can flow and which widens in the flow direction of the first partial flow, so that the flow-dividing element is designed as a cone, at least in the partial region.

Further, the DE 10 2009 053 950 A1 a device for the aftertreatment of exhaust gases in an exhaust system of internal combustion engines. Here, too, a metering device for supplying reducing agent is provided.

Finally, the reveals WO 2012/047159 A1 an exhaust gas aftertreatment device with an exhaust gas guide element through which exhaust gas can flow and with a metering device, by means of which a reducing agent can be introduced into the exhaust gas guide element.

The reducing agent serves to Entsticken the exhaust gas. This is to be understood that the exhaust gas of the example designed as a diesel engine internal combustion engine nitrogen oxides (NO _x ) may contain, which are at least partially removed or eliminated with the aid of the reducing agent. Here, the nitrogen oxides, for example, with ammonia (NH ₃ ) from the reducing agent to nitrogen and react with water. This reaction takes place, for example, in the context of a selective catalytic reduction (SCR), in particular in an SCR catalytic converter which can be flowed through by the exhaust gas mixed with the reducing agent and which can be a component of the exhaust gas aftertreatment device.

Usually, the reducing agent is an aqueous solution, in particular an aqueous urea solution, which is introduced into the exhaust gas channel, in particular injected, for example by means of the metering device. It has been shown that deposits and in particular urea deposits can occur, in particular in the interior of the exhaust-gas aftertreatment device or of the exhaust-gas guide element.

Object of the present invention is therefore to develop an exhaust aftertreatment device of the type mentioned in such a way that excessive deposits of the reducing agent can be avoided.

This object is achieved by an exhaust aftertreatment device with the features of claim 1. Advantageous embodiments with expedient developments of the invention are specified in the remaining claims.

In order to develop an exhaust aftertreatment device specified in the preamble of claim 1 such that deposits of the reducing agent, ie in particular urea deposits or urea resulting deposits can be avoided as far as possible, it is inventively provided that in the second subchannel, a second flow divider is arranged. By the second flow dividing element of the second sub-channel is divided or divided into a first sub-channel, a second sub-channel and a third sub-channel. The first subchannel can be flowed through by a first underflow of the exhaust gas, wherein the second subchannel can be flowed through by a second underflow of the exhaust gas. In addition, the third sub-channel can be traversed by a third underflow of the exhaust gas. The mentioned undercurrents are respective further partial flows of the second partial flow, which thus comprises the underflows. In other words, the second partial flow flowing through the second partial channel is divided into the underflows by means of the second flow element, so that the exhaust gas or a total flow of the exhaust gas is further divided not only by means of the first flow dividing element in the first partial flow and the second partial flow, but also by means of the second flow dividing element in the undercurrents on.

In this case, the second flow-dividing element has a channel region which can be flowed through by the second underflow and the third underflow and which widens in the flow direction of the second underflow and the third underflow. Since the first channel region widens, the first flow dividing element or the first channel region is designed as a cone. In this case, the second flow dividing element or the second channel region is likewise designed as a cone. By using not only the first flow dividing element, but in particular also the second flow dividing element, the total flow of the exhaust gas can be divided several times before the exhaust gas is supplied to the supply point and thus, for example, to a nozzle arranged at the feed point, via which the reducing agent is introduced into the exhaust gas routing element. arrives. The undercurrents directed to the nozzle have in particular the task of supporting the reducing agent. The reducing agent is introduced, for example, with the formation of a jet or a spray in the exhaust gas guide element, wherein the undercurrents in particular have the task to support the spray and reliably transported out of a near-nozzle area to avoid deposits of the reducing agent. The remaining undercurrents and the first partial flow ensure a large-area distribution of the spray or reducing agent at wall areas in regions remote from the nozzle in order to keep the so-called surface load and thus the cooling of the exhaust gas guide element at least low. As a result, the risk of deposits of the reducing agent being kept particularly low.

As a result, in the case of the exhaust gas aftertreatment device according to the invention, it is possible to realize particularly high metering rates under otherwise identical operating conditions compared to customary exhaust gas aftertreatment devices, ie to introduce particularly large amounts of the reducing agent into the exhaust gas guide element without resulting in excessive deposits. By using the second flow dividing element, a particularly advantageous preparation of urea can be realized without or with very little formation of deposits despite particularly high metering rates and lower temperatures. It is particularly possible to avoid deposits both near the nozzle and in areas away from the nozzle. As a result of the fact that the surface load of wall regions, which may possibly be exposed to reducing agent, can be kept low, the cooling of these wall regions can be kept low. This results in a particularly advantageous evaporation of the introduced amount of the reducing agent.

As a result of the advantageous treatment of the reducing agent, which is, for example, an aqueous urea solution, by means of the second flow-dividing element, it is also possible to introduce particularly large quantities of the reducing agent, in order to be able to entrain the exhaust gas particularly well. In particular, it is possible to realize a particularly advantageous mixing of ammonia liberated from the reducing agent up to entry into an SCR catalyst, as a result of which particularly high conversions in the SCR catalyst can be represented (SCR-selective catalytic reduction). Another advantage is that, despite the use of the second flow dividing element and in particular by its special design, the exhaust backpressure can be kept low, so that the exhaust aftertreatment device according to the invention enables a particularly efficient and thus fuel-efficient operation of the internal combustion engine. Thus, the second flow dividing element can be used at least almost fuel consumption neutral.

In an advantageous embodiment of the invention, the second channel region is arranged at least partially in the first channel region. In other words, it is provided, for example, that the second channel region projects at least partially into the first channel region. This allows a particularly advantageous flow distribution and flow control of the exhaust gas can be realized, so that the risk of deposits can be kept very low.

It has proven particularly advantageous if the reducing agent can be introduced, in particular injectable, into the second channel in an injection direction, with the channel regions each expanding along the direction of injection. In other words, the injection direction coincides with a direction in which the channel regions expand. This means that the channel regions have respective passage directions through which the exhaust gas can flow through the channel regions. The respective passage direction coincides with the injection direction. Since the jet or the spray of the reducing agent, for example, at least partially enters the channel areas, the risk of deposits can be kept particularly low.

A further embodiment is characterized in that the reducing agent along the formation of the jet or spray along a coincident with the injection direction, imaginary straight line can be introduced into the second sub-channel, wherein the channel regions are each arranged coaxially to the straight line. In other words, it is preferably provided that the straight line coincides with respective central axes of the channel regions. As a result, excessive deposition of reducing agent can be avoided at wall areas.

If the jet or the spray is, for example, at least substantially conical or frusto-conical, then it is preferably provided that the imaginary straight line coincide with the central axis of the cone or of the truncated cone.

In a particularly advantageous embodiment of the invention, the first sub-channel is bounded by a first surface region of the first flow divider element and a first portion of an inner surface of the exhaust guide member facing the first surface region, wherein the second sub-channel by a second surface region of the first flow divider element facing away from the first surface region and a second surface area facing the second part of the inside of the exhaust gas guide element is limited. In this way, a particularly advantageous flow distribution can be realized, so that excessive deposits of the reducing agent can be safely avoided. Furthermore, a particularly advantageous flow guidance of the exhaust gas can be realized, so that the exhaust backpressure in the exhaust aftertreatment device can be kept low.

In order to realize a particularly advantageous flow guidance and flow distribution, it is provided in a further embodiment of the invention that the first subchannel is bounded by a third part of the second surface region of the first flow divider element and a third surface region of the second flow divider element facing the third part, wherein the third subchannel is bounded by a fourth surface region of the second flow element facing away from the third surface region and a fifth surface region of the second flow element facing the fourth surface region.

Furthermore, it has proven particularly advantageous if the second subchannel is delimited by a sixth surface region of the second flow dividing element facing away from the fifth surface region and a subregion of the second part of the inside of the exhaust gas guide element facing the sixth surface region. This makes it possible to realize a particularly advantageous flow guidance and flow distribution, so that excessive deposits can be avoided.

A further embodiment is characterized in that the third subchannel are assigned straight guide elements for guiding the exhaust gas. The straight guide elements are, for example, straight wings which are at least substantially flat or flat or planar and thus allow an at least substantially symmetrical flow at the nozzle.

To realize a particularly symmetrical flow at the nozzle, it is possible, for example, to use an at least substantially vertical guide element, in particular in the form of a sheet.

In a further advantageous embodiment of the invention, curved guide elements are provided for effecting an at least substantially swirl-shaped flow of at least part of the exhaust gas. By means of the curved guide elements, which are designed, for example, as curved wings, a swirl-shaped flow can be impressed on at least part of the exhaust gas, so that an advantageous turbulence of the exhaust gas can be produced. As a result of this turbulence, the exhaust gas can be mixed particularly well with the reducing agent, so that a particularly good treatment of the reducing agent can be represented. As a result, excessive deposits can be avoided.

It has been found to be particularly advantageous if the curved guide elements are arranged in the second sub-channel. As a result, a swirl flow can be realized in the second channel region, that is, in the inner, second cone. The aim here is to avoid detachment or flow separation in the inner cone despite the large opening angle of the inner cone.

Further advantages, features and details of the invention will become apparent from the following description of a preferred embodiment and from the drawing. The features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures can be used not only in the respectively specified combination but also in other combinations or in isolation, without the scope of To leave invention.

The drawing shows in:

1 a schematic sectional view of an exhaust gas aftertreatment device for an internal combustion engine of a motor vehicle, having an exhaust gas guide element, which comprises at least one of exhaust gas of the internal combustion engine through-flowable exhaust duct, in which a first flow divider and a second flow divider element for flow distribution of the exhaust gas are arranged;

2 a detail of another schematic sectional view of the exhaust aftertreatment device;

3 a detail of another schematic sectional view of the exhaust aftertreatment device;

4 a fragmentary schematic and perspective rear view of the exhaust aftertreatment device;

5 a schematic sectional view of the exhaust aftertreatment device along a in 4 shown section line AA;

6 an enlarged view of an in 5 designated B area of the exhaust aftertreatment device;

7a In each case a detail of a schematic sectional view of the exhaust aftertreatment device to illustrate the functions of the flow dividing elements; and

8th a schematic sectional view of the exhaust aftertreatment device.

In the figures, the same or functionally identical elements are provided with the same reference numerals.

1 shows a schematic sectional view of an exhaust gas aftertreatment device for an internal combustion engine of a motor vehicle. The internal combustion engine is designed for example as a diesel engine and serves to drive the motor vehicle. The exhaust gas aftertreatment device comprises at least one exhaust gas routing element 10 , which at least one of exhaust gas of the internal combustion engine can be flowed through and in total with 12 having designated exhaust passage. The exhaust duct 12 extends into a mixing tube 14 the exhaust guide element 10 , where the mixing tube 14 in particular for mixing the exhaust gas with a reducing agent is used.

The exhaust aftertreatment device further comprises an in 1 particularly schematically illustrated metering device 16 , by means of which at least one feed point 18 the reducing agent in the exhaust duct 12 einbringbar, in particular injectable, is. The reducing agent serves to Entsticken the exhaust gas. This is understood to mean that with the aid of the reducing agent in the exhaust gas contained nitrogen oxides (NO _x ) are at least partially removed from the exhaust gas. The reducing agent is for example an aqueous urea solution, from which in the exhaust gas channel 12 after introduction into the exhaust gas duct 12 Ammonia (NH ₃ ) is released. The nitrogen oxides contained in the exhaust gas can react with the ammonia as part of a selective catalytic reduction (SCR) to nitrogen and water.

In synopsis with 8th it can be seen that upstream of the feed point 18 a particle filter 20 is arranged, which can be flowed through by the exhaust gas. Since the internal combustion engine is designed here as a diesel engine, the particulate filter 20 a diesel particulate filter (DPF). To the particle filter 20 closes a collection chamber 22 on, in which the exhaust gas can collect. The exhaust gas can then from the collection chamber 22 into the mixing tube 14 flow, which will be explained in more detail below. The particle filter 20 serves to filter particles and in particular soot particles from the exhaust gas.

Downstream of the feed point 18 and in particular downstream of the mixing tube 14 For example, at least one SCR catalytic converter of the exhaust gas aftertreatment device is arranged. By means of the SCR catalyst, which can be flowed through by the exhaust gas and the reducing agent metered or introduced into the exhaust gas, the selective catalytic reduction is effected or supported.

Out 1 it can be seen that the reducing agent forms a jet into the exhaust gas channel 12 is introduced, the jet as a spray 24 is designated. The spray 24 is formed at least substantially conical or has a conical shape, the central axis in 1 With 26 is designated. The central axis 26 is an imaginary straight line, which coincides with an injection direction, in which the reducing agent by means of the metering device 16 at the feed station 18 in the exhaust duct 12 introduced and injected in particular. This means that the spray 24 along the injection direction and thus along the central axis 26 from the metering device 16 spreads away.

In the exhaust duct 12 is now a first flow dividing element 28 arranged, by means of which the exhaust duct 12 into a first subchannel 30 and a second subchannel 32 divided or divided. The first subchannel 30 is by a by a directional arrow 34 illustrated, first partial flow of the exhaust gas flow through. The second subchannel 32 is from one by a directional arrow 36 illustrated second partial flow of the exhaust gas flowed through. This means that the exhaust gas, in particular a total flow of the exhaust gas, by means of the first flow dividing element 28 is divided into the first partial flow and the second partial flow. In this case, the first flow dividing element 28 a widening in the flow direction of the first partial flow channel region 38 which is thus a first cone.

The first cone (first channel area 38 ) is coaxial with the central axis 26 arranged so that the central axis of the first cone with the central axis 26 coincides. Upstream of the first channel area 38 has the first flow dividing element 28 a wall area 40 which is at least substantially vertical or perpendicular to the central axis 26 runs. The flow dividing element 28 is formed of sheet metal, for example. As the wall area 40 upstream of the first channel region 38 is arranged, the total flow is first by means of the wall region 40 divided up. The first subchannel 30 is on a first page 42 the flow dividing element 28 arranged, wherein the second sub-channel 32 on one of the first page 42 opposite, second side 44 of the first flow dividing element 28 is arranged.

In the area of the feed point 18 has the metering device 16 For example, a nozzle, by means of which the reducing agent to form the spray 24 in the exhaust duct 12 is injected. The at least substantially vertical and formed, for example, sheet metal wall area 40 allows in particular the realization of an at least substantially symmetrical flow at the nozzle or the feed point 18 ,

To order now even at high metering rates, that is, at high levels of the in the exhaust duct 12 introduced reducing agent to keep the risk of deposits of the reducing agent low or to avoid excessive deposits is in the second sub-channel 32 a second flow dividing element 46 arranged, which may be formed for example of a metallic material or sheet metal. As will be explained in more detail below, by the second flow dividing element 46 a further flow division of the exhaust gas, in particular the second partial flow, causes, so that a particularly advantageous treatment of the reducing agent can be realized. As a result of this treatment, the reducing agent can be mixed particularly well with the exhaust gas, so that deposits of the reducing agent in the interior of the exhaust gas guide device can be kept at least low.

Through the second flow dividing element 46 is the second subchannel 32 into a first subchannel 48 , a second subchannel 50 and one between the first subchannel 48 and the second subchannel 50 arranged third subchannel 52 divided. The subchannels 48 . 50 and 52 are thus further sub-channels of the second sub-channel 32 , where the first subchannel 48 from a first underflow, the second subchannel 50 from a second underflow and the third subchannel 52 can be traversed by a third underflow of the exhaust gas. This means that the second partial flow of the exhaust gas by means of the second flow dividing element 46 is further divided into the three sub-flows, whereby the risk of deposits can be kept very low. In this case, the second flow dividing element 46 a second channel region which can be flowed through by the second and third underflows and which widens in the direction of flow of the second and third underflows 54 on, which is thus a second cone.

By a directional arrow 56 is the first undercurrent illustrated by a directional arrow 58 the second underflow is illustrated. Further, by a directional arrow 60 the third underflow illustrates. The by the directional arrow 34 illustrated first part flow is used in particular to the spray 24 to protect against a mainstream. The first undercurrent, which by the directional arrow 56 in particular, serves to prevent the spray 24 on the first, outer cone (first channel area 38 ). The by the directional arrow 58 illustrated second undercurrent serves to increase the momentum of the spray 24 to raise and spray 24 into the mixing tube 14 hinauszubefördern. Finally, the serves by the directional arrow 60 illustrated third undercurrent to prevent the spray 24 the inner, second cone (second channel area 54 ) and to increase the momentum of the spray 24 ,

In order to keep the risk of deposits particularly low, is - as from 1 is recognizable - the inner second cone at least partially disposed in the outer first cone. In the present case, a portion of the inner cone protrudes into the outer cone. The feeder 18 is in the second subchannel 32 and present in the second subchannel 50 arranged, with the spray 24 penetrates the inner cone and reaches into the outer cone.

Out 1 It can also be seen that the central axis of the channel region 54 with the central axis 26 coincides so that the channel areas 38 and 54 coaxial with each other and coaxial with the central axis 26 are arranged. This extends the second channel area 54 in the injection direction of the spray 24 and thus along the central axis 26 from the metering device 16 away as well as the first channel area 38 ,

The first subchannel 30 is through a first surface area 62 of the first flow dividing element 28 and a first surface area 62 facing first part 64 one the exhaust duct 12 limiting inside 66 the exhaust guide element 10 limited. The second subchannel 32 is through a the first surface area 62 remote, second surface area 68 of the first flow dividing element 28 and a second surface area 68 facing the second part 70 the inside 66 the exhaust guide element 10 limited.

The first subchannel 48 is through a third part 72 of the second surface area 68 of the first flow dividing element 28 and the third part 72 facing third surface area 74 of the second flow dividing element 46 limited. The third subchannel 52 is through a third surface area 74 remote fourth surface area 76 of the second flow dividing element 46 and a fourth surface area 76 facing fifth surface area 78 of the second flow dividing element 46 limited.

Further, the second subchannel 50 through a fifth surface area 78 remote, sixth surface area 80 of the second flow dividing element 46 and a sixth surface area 80 facing portion of the second part 70 the inside 66 the exhaust guide element 10 limited.

In 2 is a percentage distribution of the total mass flow through the exhaust gas guide element 10 illustrated. The proportion of the directional arrow 34 at least 55 percent and at most 75 percent. The proportion of the directional arrow 36 illustrated second partial flow on the total mass flow, in particular total exhaust gas mass flow is at least 25 percent and at most 45 percent. The first undercurrent is in 2 by directional arrows 56 illustrated. The proportion of the first underflow in the total mass flow is at least 22 percent and a maximum of 40 percent. The proportion of a 2 by a directional arrow 82 For example, illustrated flow through the inner second cone in the total mass flow is at least 2.5 percent and at most 7.5 percent.

The second underflow is in 2 With 84 designated, wherein the proportion of the second underflow 84 on the total mass flow is about 0 percent to 2 percent. The third undercurrent is in 2 With 86 denoted, wherein the proportion of the third undercurrent 86 the total mass flow is at least 3 percent and at most 6.5 percent.

3 shows the exhaust gas aftertreatment device in sections in a schematic sectional view, wherein in 3 a section line AA is shown. Out 3 to 5 is particularly good at least substantially vertical wall area 40 recognizable, whereby an at least substantially vertical sheet is formed to realize a symmetrical flow to the nozzle. 6 shows an in 5 with B designated area in an enlarged view. How out 4 to 6 is recognizable, are in the third subchannel 52 straight guide elements in the form of straight wings 88 assigned, by which an at least substantially symmetrical flow to the nozzle can be realized. In addition, curved guide elements are in the form of curved wings 90 provided, wherein the curved guide elements, for example, the second sub-channel 32 and in particular the third subchannel 52 are assigned to thereby realize a swirl flow or an at least substantially swirl-shaped flow of the exhaust gas in the inner second cone. The aim here is to avoid a detachment in the inner second cone despite a large opening angle of the inner second cone.

Such an at least substantially swirl-shaped flow of the exhaust gas is in 8th shown in a region C. This swirl-shaped flow extends at least substantially helically or helically about a longitudinal axis, which coincides with the main flow direction, into which the exhaust gas is the mixing tube 14 flows through.

Furthermore, in 8th a region D is shown in which the exhaust gas is split. In a region E, there is a flow guidance of the exhaust gas, which in particular through the second flow dividing element 46 is effected. As a result, a partial flow can be generated at the nozzle to the spray 24 to support and transport out of a near-jet area without wall wetting out. A mainstream can enter the mixing tube 14 arrive, with this main flow can be imparted a twist to achieve a large-scale wetting. This can be done on the inside 66 a low surface load can be avoided, so that excessive temperature drop can be avoided. As a result, the reducing agent can evaporate, whereby excessive deposits can be avoided.

The nozzle-near second flow dividing element 46 thus serves, in particular, to realize a partial stream near the nozzle, in particular in the form of the second underflow, in order to rinse the nozzle itself and to increase the spray pulse, so that the reducing agent or its droplets in the direction of the mixing tube 14 be transported. In this case, a further, not outlined flow division can take place. The first and / or third underflow serves to realize a jacket around the spray 24 to prevent the outer first cone from becoming wet. Flow detachments on respective inner walls of the two cones are preferably to be avoided, with an applied flow being sought parallel to the respective inner walls. As a result, drops can be removed and wall wetting avoided. Furthermore, the heat input into the walls can be increased to ensure the evaporation of the reducing agent in the case of wetting.

7a 1 are respective sectional views of the exhaust aftertreatment device to illustrate respective functions. 7a illustrates the flow of exhaust gas without any flow dividing element and guide element. The flow of the exhaust gas is in 7a by a directional arrow 91 illustrated with a directional arrow 92 illustrates the flow of the reducing agent.

In 7b is the wall area 40 provided, through which the exhaust gas or its flow can be divided, wherein the flow of the exhaust gas in 7b by directional arrows 91 is illustrated.

7c shows the exhaust aftertreatment device with the first outer cone (first flow dividing element 28 ), the outer cone being the spray 24 protects against the flow of exhaust gas.

In 7d is the function of the inner cone (second flow dividing element 46 ). The inner cone protects the spray 24 before a lateral support flow. Furthermore, it is off 7e Recognize that the inner cone carries the flow to the spray 24 to support from behind.

LIST OF REFERENCE NUMBERS

10

Exhaust guide element

12

exhaust duct

14

mixing tube

16

metering

18

induct

20

particulate Filter

22

plenum

24

spray

26

central axis

28

first flow dividing element

30

first subchannel

32

second subchannel

34

arrow

36

arrow

38

first channel area

40

wall region

42

first page

44

second page

46

second flow dividing element

48

first subchannel

50

second subchannel

52

third subchannel

54

second channel area

56

arrow

58

arrow

60

arrow

62

first surface area

64

first part

66

inside

68

second surface area

70

second part

72

third part

74

third surface area

76

fourth surface area

78

fifth surface area

80

sixth surface area

82

arrow

84

second underflow

86

third undercurrent

88

straight wings

90

curved wings

91

arrow

92

arrow

B

Area

C

Area

D

Area

e

Area

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

• US 2010/0005791 A1 [0002]
• DE 102009053950 A1 [0005]
• WO 2012/047159 A1 [0006]

Claims (10)

Exhaust after-treatment device for an internal combustion engine of a motor vehicle, with at least one exhaust-gas guide element ( 10 ), which at least one of exhaust gas of the internal combustion engine through-flowable exhaust gas channel ( 12 ), with a metering device ( 16 ), by means of which at least one feed point ( 18 ) a reducing agent for Entsticken the exhaust gas in the exhaust passage ( 12 ) and with one in the exhaust passage ( 12 ) arranged flow divider ( 28 ), by means of which the exhaust duct ( 12 ) in a first partial passage through which a first partial flow of the exhaust gas can flow ( 30 ) and a second partial passage through which a second partial flow of the exhaust gas can flow ( 32 ), in which the feed point ( 18 ) is divided, wherein the flow dividing element ( 28 ) can be traversed by the first partial flow and extending in the flow direction of the first partial flow channel region ( 38 ), characterized in that in the second sub-channel ( 32 ) into the second flow divider ( 46 ) is arranged, through which the second sub-channel ( 32 ) in a first sub-channel through which a first underflow of the exhaust gas can flow ( 48 ), one of a second underflow ( 84 ) of the exhaust gas permeable, second subchannel ( 50 ), in which the feed point ( 18 ) and one of a third underflow ( 86 ) of the exhaust gas flow, between the first subchannel ( 48 ) and the second subchannel ( 50 ), third subchannel ( 52 ), wherein the second flow dividing element ( 46 ) one of the second and third underflow ( 84 . 86 ) and in flow direction of the second and the third underflow ( 84 . 86 ), second channel area ( 54 ) having. Exhaust after-treatment device according to claim 1, characterized in that the second channel region ( 54 ) at least partially in the first channel region ( 38 ) is arranged. Exhaust after-treatment device according to claim 1 or 2, characterized in that the reduction means in an injection direction into the second sub-channel ( 32 ), whereby the channel regions ( 38 . 54 ) each extend along the injection direction. Exhaust after-treatment device according to claim 3, characterized in that the reducing agent is formed to form at least one jet ( 24 ) along an imaginary line coinciding with the direction of injection ( 26 ) into the second subchannel ( 32 ), the channel areas ( 38 . 54 ) each coaxial with the straight line ( 26 ) are arranged. Exhaust after-treatment device according to one of the preceding claims, characterized in that the first sub-channel ( 30 ) through a first surface area ( 62 ) of the first flow dividing element ( 28 ) and a first surface area ( 62 ) facing the first part ( 64 ) an inside ( 66 ) of the exhaust guide element ( 10 ), the second subchannel ( 32 ) by a first surface area ( 62 ), second surface area ( 68 ) of the first flow dividing element ( 28 ) and a second surface area ( 68 ) second part ( 70 ) of the inside ( 66 ) of the exhaust guide element ( 10 ) is limited. Exhaust after-treatment device according to claim 5, characterized in that the first subchannel ( 48 ) by a third part ( 72 ) of the second surface area ( 68 ) of the first flow dividing element ( 28 ) and the third part ( 72 ) facing third surface area ( 74 ) of the second flow dividing element ( 46 ), the third subchannel ( 52 ) by a third surface area ( 74 ) facing away from the fourth surface area ( 76 ) of the second flow dividing element ( 46 ) and a fourth surface area ( 76 ) facing fifth surface area ( 78 ) of the second flow dividing element ( 46 ) is limited. Exhaust after-treatment device according to claim 6, characterized in that the second subchannel ( 50 ) through a fifth surface area ( 78 ), sixth surface area ( 80 ) of the second flow dividing element ( 46 ) and a sixth surface area ( 80 ) facing portion of the second part ( 70 ) of the inside ( 66 ) of the exhaust guide element ( 10 ) is limited. Exhaust after-treatment device according to one of the preceding claims, characterized in that the third subchannel ( 52 ) straight guiding elements ( 88 ) are assigned to direct the exhaust gas. Exhaust after-treatment device according to one of the preceding claims, characterized in that curved guide elements ( 90 ) are provided for effecting a swirling flow of at least a part of the exhaust gas. Exhaust after-treatment device according to claim 9, characterized in that the curved guide elements ( 90 ) in the second subchannel ( 32 ) are arranged.

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