DE102014215521A1 - Exhaust gas recirculation arrangement - Google Patents

Abstract

The invention relates to an exhaust gas recirculation arrangement (10) for recirculating exhaust gas of a combustion device into the gas flow to be supplied to the combustion device, comprising a recirculation exhaust gas cooler (30) in a return duct (20) for the exhaust gas to be recirculated, one downstream of the exhaust gas cooler (30) Cooling section (32) of the exhaust gas cooler (30) of the return duct (20) branching off derivative (40) for discharging nichtrückzuführendem exhaust gas from the return duct (20) is provided, which at least partially spatially closely adjacent to the cooling section (32) passes and substantially opposite (X) of the return direction (R) can be flowed through by exhaust gas. Furthermore, the invention relates to an internal combustion engine with such exhaust gas recirculation arrangement.

Description

The invention relates to an exhaust gas recirculation arrangement for recirculating exhaust gas of a combustion device into the gas stream to be supplied to the combustion device. The exhaust gas recirculation arrangement has a return channel for the exhaust gas to be recirculated, wherein an exhaust gas cooler through which the recirculated exhaust gas can flow in the return direction is arranged in the recirculation channel is. Moreover, the present invention relates to an internal combustion engine having such exhaust gas recirculation arrangement.

To reduce harmful emissions from combustion devices such as turbocharged turbochargers, the resulting exhaust may be removed, for example downstream of a turbine of an exhaust gas turbocharger the exhaust tract and upstream of a compressor of the exhaust gas turbocharger the intake air are supplied ("exhaust gas recirculation" EGR). The volumetric flow of the amount of exhaust gas to be recirculated into the fresh air tract is usually controlled by means of a valve device which is arranged in the return duct. In order to protect the compressor from excessive exhaust gas temperatures, an exhaust gas cooler is usually arranged in the return channel, which cools the exhaust gas to be recirculated while dissipating exhaust gas heat. The exhaust gas cooling has the additional effect of the further reduction of nitrogen oxides in the exhaust gas. The purpose of exhaust gas recirculation is to produce a mixture of fresh air and exhaust gas which is fed to the combustion process and has a lower oxygen content than rich fresh air, whereby the temperature in the combustion chamber can be further adjusted to an optimum level.

The heat taken from the exhaust gas through the exhaust gas cooler can be supplied to a further use. For example. For example, the internal combustion engine and / or a passenger compartment of a motor vehicle can be heated by utilizing the waste heat removed from the exhaust gas. Further details of conventional exhaust gas recirculation arrangements are in the document DE 10 2009 058 609 A1 and are incorporated by reference into the present disclosure.

The in the DE 10 2009 058 609 A1 However, the exhaust gas recirculation arrangement described has the disadvantage that a total of three actuators for controlling the exhaust gas mass flows are required. Furthermore, this known exhaust gas recirculation arrangement requires a large space and is also complex in manufacturing and assembly.

In view of the described problems, the invention has for its object to provide a very compact and easy to install exhaust gas recirculation arrangement, which leads to a total close to the exhaust gas cleaning. In particular, the EGR module should be further throttled and the traceable exhaust gas volumes should thereby be increased.

This object is achieved by an exhaust gas recirculation arrangement of o.g. Art solved with the features characterized in claim 1. Advantageous embodiments of the invention are described in the further claims.

The exhaust gas recirculation arrangement according to the invention is characterized in that downstream of a cooling section of the exhaust gas cooler, a discharge line for discharging non-recirculating exhaust gas branches off from the return channel, wherein the discharge line at least partially passes close to the cooling section and can be flowed through against the return direction by exhaust gas.

The derivative therefore branches off behind the cooling section of the return duct, so that at least a portion of the already cooled exhaust gas removed from the return duct and an exhaust system or the ambient air can be supplied. The heat taken from the exhaust gas in the exhaust gas cooler can be used, for example, to heat the internal combustion engine and / or the passenger compartment, without the cooled exhaust gas necessarily having to be completely recirculated to the fresh air section of the internal combustion engine. Rather, the exhaust gas can be removed according to need, at least partially after its cooling via the discharge to the return channel.

Particularly important according to the invention is the spatial proximity between the discharge and the cooling section and the conducting of the already cooled exhaust gas opposite to the return direction next to the cooling section or next to the exhaust gas cooler, so that the cooled exhaust gas can in turn be led back via the discharge into an area upstream of the exhaust gas cooler , There, the recirculated, cooled exhaust gas, for example, can be introduced into an upstream of the exhaust gas cooler from the return duct branching second derivative. This results in a total of a particularly compact and space-saving exhaust gas recirculation arrangement.

The invention is based on the knowledge that a leading away from the exhaust gas cooler and the return channel derivative 11, as described in said document DE 10 2009 058 609 A1 shown, takes a considerable amount of space and also leads to a remote from the return duct arranged further interface for introducing the exhaust gas flowing through the discharge back into the exhaust tract and a further valve means are required for this purpose. On the other hand, according to the invention, if the drain is spatially narrowed along the cooling section, the drainage space requirement can be reduced and the interface for introducing the exhaust gas flowing through the drainage back into the exhaust tract can be arranged close to the return line, so that no further interface possibly with additional valve device is required.

According to a particularly important aspect of the invention, the distance between the cooling section and the discharge is set up such that the exhaust gas flowing through the discharge can be cooled once more through the cooling section of the exhaust gas cooler. For this purpose, the discharge preferably runs over at least 50% of the longitudinal dimension of the cooling section, preferably over its entire longitudinal dimension, at a distance from the cooling section, in which the cooling medium present in the cooling section can achieve a cooling effect on the exhaust gas in the discharge. By cooling the already cooled exhaust gas once more, the cooling medium can be heated more strongly, so that the waste heat can be made more efficient overall usable. The discharge preferably extends at least in sections radially outward past a cooling body of the cooling section having the cooling medium.

A particularly compact exhaust gas recirculation arrangement is characterized in that the distance between the cooling section of the exhaust gas cooler and the discharge at least partially smaller than 50 cm, preferably smaller than 25 cm, more preferably smaller than 10 cm, in particular that the discharge directly adjacent to the cooling section , By a small distance, the use of waste heat can be further improved. The said distance is measured between adjacent regions of the discharge and the cooling section in which they are flowed through in the reverse direction of exhaust gas.

A particularly efficient use of the waste heat is possible because the derivative at least partially runs within a housing of the exhaust gas cooler or is integrated into the exhaust gas cooler. In this embodiment, the gas flowing through the drain can also insulate the cooling section of the exhaust gas cooler to the outside. Further, in the anyway required cooler housing derivative has a very small footprint. A separately running derivative, which must necessarily be coupled with a decoupling element to the exhaust system, thereby eliminating.

A particularly large contact surface between the discharge and the cooling section of the cooler and thus a particularly efficient heat exchange can be achieved in that the discharge at least partially concentrically around the cooling section of the exhaust gas cooler around. In other words, the derivative circumferentially adjacent to an outer boundary of the cooling medium having the cooling section. In this case, the discharge line can be essentially annular, in particular annular, in a sectional view extending transversely to the flow direction.

The exhaust gas cooler may be a tube cooler and / or the cooling section may have cooling passages, such as cooling tubes, running approximately parallel to one another through a cooling medium. In this case, it has proven to be advantageous in terms of a compact radiator arrangement that between the cooling section and the radiator housing a substantially cylindrical space is formed, which forms at least part of the derivative. The cooling channels are flowed through in the return direction, downstream of the cooling channels, a reversing section is provided within the radiator housing, in which the flow direction reverses with the return channel closed, wherein the exhaust gas can then flow against the return direction in the cooling section coaxial circumferential gap.

With regard to a structurally simple construction of the exhaust gas cooler, it has proven expedient to provide at least one arranged between the radiator housing and the cooling section of the radiator, preferably approximately annular spacers with flow openings, which are flowed through by the inflowing into the gap exhaust.

The exhaust gas cooler of the arrangement according to the invention causes heat transfer from the exhaust gas into the cooling medium, which preferably runs countercurrently through a cooling body arranged in the cooling section. The heated cooling medium is used on or in the motor housing for heating the motor, which is operable in the heated state with a better efficiency. In addition, the heat taken from the exhaust gas for heating the passenger compartment, the window, the exterior mirrors or the like. use of a motor vehicle. In addition to the heat transfer of the exhaust gas cooler also serves to cool the recirculated exhaust gas to protect the compressor of the engine from excessive temperatures and to achieve a sufficient compression ratio.

Preferably, a first valve device downstream of the branch point, at which the derivative branches off from the return channel, is arranged in the return channel. The valve device is used to set the amount of exhaust gas to be recirculated to the fresh air tract, and thus also the amount of exhaust gas leading to the discharge line. In other words, by means of the valve device, the volumetric flow of the recirculated cooled exhaust gas to be recirculated can be adjusted with respect to the volumetric flow of the nonreturnable cooled exhaust gas. When the valve device is completely closed, the exhaust gas flowing through the radiator via the discharge line can be guided completely back into the exhaust gas tract. According to the invention, therefore, it is possible to regulate only after the flow through the exhaust gas cooler, how much exhaust gas is actually supplied to the compressor and how much exhaust gas is used only as a heat supplier.

Alternatively or additionally, a branch point is arranged upstream of the exhaust gas cooler, to which a second discharge line for discharging non-recirculating exhaust gas is arranged, wherein preferably the discharge opens into the second discharge at a point of discharge. Downstream of the junction, the exhaust gas of an exhaust system can be supplied. Thus, depending on the need not to be recycled exhaust upstream or downstream of the exhaust gas cooler removed from the return duct and fed to the exhaust tract or be passed along the exhaust tract.

With regard to a compact design of the exhaust gas recirculation arrangement according to the invention, it has proved to be advantageous that the distance between the branch point and the point of discharge is less than 50 cm, preferably less than 30 cm, in particular less than 15 cm. The confluence of the discharge line in the second discharge is thus brought so close to the branch point that only a single interface in the form of a single pipe component can be provided, wherein the pipe component may have both the branch point and the downstream immediately adjacent arranged discharge point. This makes a further interface of the exhaust gas recirculation arrangement in the exhaust system superfluous.

Furthermore, it has proved to be expedient in terms of space savings that the return duct with the exhaust gas cooler is substantially vertical, the outlet is arranged as far as possible right in the direction of the discharge point arranged exhaust system preferably seen in the direction of travel.

Alternatively or additionally, a second valve device is provided in the second discharge line and / or in the first discharge line for adjusting the exhaust gas flow through the second discharge and thus also the exhaust gas flow through the exhaust gas cooler and / or for adjusting the exhaust gas flow to be introduced from the discharge into the second discharge line , Preferably, the second valve device releases the second drain in a first valve position and closes the (first) drain, so that no exhaust gas flows through the first drain. The second valve device preferably closes the first outlet in a second valve position and releases the second outlet, so that the exhaust gas can flow through the first outlet. In combination with the first valve device can thus be controlled on the one hand, the proportion of recirculated to the fresh air exhaust gas and the other part of the non-recirculating exhaust gas, the waste heat is, however, made usable.

The exhaust gas recirculation arrangement according to the invention can be mounted in a particularly space-saving manner on an engine block if the discharge runs at least in sections, preferably over more than 30%, in particular over more than 50% of its extension, substantially parallel to the return channel.

Further details regarding the characteristics of the exhaust gas recirculation and with regard to the use of the heat of the heated cooling medium are in the document DE 10 2009 058 609 A1 and are incorporated by reference into the present disclosure.

According to a further aspect, the invention relates to an internal combustion engine with an exhaust gas recirculation arrangement according to the invention, wherein the exhaust gas recirculation arrangement is arranged on an exhaust gas recirculation path, and the discharge line is arranged such that it supplies the exhaust gas not to be recirculated to an exhaust system and / or discharges it into the environment.

Preferably, the exhaust gas recirculation arrangement is mounted on the internal combustion engine such that the return direction is substantially in the direction of gravity. This "vertical" arrangement of the EGR module makes the exhaust gas cleaning close to the engine necessary for the interface formed by the discharge point, which interface can be used according to the invention for integrating the discharge line, the second valve device and / or the branching point. This fact opens up the possibility of carrying out the discharge as part of the housing of the cooler.

Furthermore, the invention relates to a motor vehicle such as an automobile with an internal combustion engine according to the invention.

The invention will be explained in more detail below with reference to the drawing. This shows in

1a A first embodiment of an exhaust gas recirculation arrangement according to the invention in a schematic representation,

1b in the 1a shown embodiment in a second valve position,

1c in the 1a shown embodiment in a third valve position,

2 an exhaust gas cooler of a second embodiment of an exhaust gas recirculation arrangement according to the invention in a sectional view, and

3 a third embodiment of an exhaust gas recirculation arrangement according to the invention in a perspective view.

First, the structure of the exhaust gas recirculation arrangement according to the invention 10 based on the in 1a Schematic diagram explained. Essential elements of the exhaust gas recirculation arrangement 10 are in a return channel 20 arranged exhaust gas cooler 30 with a cooling section disposed therein 32 and the downstream of the exhaust gas cooler (or downstream of the cooling section 32 of the exhaust gas cooler 30 ) from the return channel 20 branching (first) derivative 40 , About the derivation 40 can not be recycled, already cooled exhaust gas from the return channel 20 branched off and an exhaust system 60 be supplied.

The return channel 20 can proceed from any point of the exhaust tract in the direction of the fresh air tract and connect the exhaust tract so with the fresh air tract that at least a portion of the exhaust gas generated by the combustion device via the return channel 20 can be introduced into the fresh gas stream to be supplied to the combustion device. At the in 1a illustrated embodiment, the return channel branches 20 downstream of a turbine of a turbocharger (not shown) from the exhaust tract and enters upstream of a compressor (not shown) in the fresh air tract. However, the return channel can also be provided at a different position. In 1a is merely a particle filter arranged downstream of the turbine 80 shown, starting from which the exhaust either down in the direction of the exhaust system 60 or via the return channel 20 can be directed to the left in the direction of the fresh air tract.

Next to the downstream of the cooling section 32 of the exhaust gas cooler 30 from the return channel 20 branching first derivative 40 is additionally an upstream of the exhaust gas cooler 30 at a branch point 22 branching second derivative 42 provided, the first derivative 40 at a confluence point 24 into the second derivative 42 opens. As shown, the distance between the mouth is 24 and the branching point 22 very small, especially smaller than 30 cm, so that a single interface in the form of a pipe component 90 (please refer 3 ) both the confluence point 24 as well as the branch point 22 can have.

In the return line 20 is downstream of the branching derivative 40 a first valve device 50 arranged in the form of an EGR valve (Butterfly), and at the confluence point 24 is in the derivatives 40 . 42 a second valve device 52 arranged in the form of a flap valve. The supply of the exhaust gas to the individual components shown by means of fluidic connections such as pipes and / or by an integral arrangement of the components in a housing.

At the junction 22 the exhaust gas flow can be split into a first, through the exhaust gas cooler 30 flowing exhaust gas flow and a second, the exhaust system 60 to be supplied exhaust stream. Downstream of the point of the return channel 20 at the first derivative 40 can branch off, through the exhaust gas cooler 30 already cooled exhaust gas flow are divided into a first, the fresh air tract recirculated exhaust gas stream and a second, the exhaust system 60 to be supplied exhaust stream. The individual volume flows can be achieved by means of the two valve devices 50 . 52 be regulated depending on which amount of exhaust gas is recirculated into the fresh air tract and what amount of useful heat by means of the exhaust gas cooler 30 is to tap.

In 1b is a second exemplary position of the two valve devices 50 . 52 illustrated in which the second valve means 52 the first derivative 40 closes and the second derivative 42 opens and the first valve device 50 the return channel 20 opens. This position is set during normal operation when the engine is warmed up. In this case, no exhaust gas flows through the first derivative 40 , while the exhaust gas recirculation via the return duct 40 is activated.

In 1c is a third exemplary position of the two valve devices 50 . 52 illustrated in which the second valve means 52 the second derivative 42 mostly closes and the first derivative 40 opens and the first valve device 50 the return channel 20 closes. This position is set in the warm-up phase of the engine. In this case, the exhaust gas heats the cooling medium of the cooling section 32 and then goes over the first derivative 40 the exhaust system 60 fed. Exhaust gas recirculation is not activated.

Depending on requirements, intermediate positions of the two valve devices 50 . 52 possible. Particularly important according to the invention is the course of the first derivative 40 , This runs spatially close to the cooling section 32 of the exhaust gas cooler 30 and is on the whole in the reverse direction as the cooling section 32 flowed through by the exhaust gas. In other words, the exhaust gas after the flow through the cooling section 32 about the derivative 40 back to the area of the branch point on a short way 22 directed where it is immediately downstream of the branching point 22 at the confluence 24 into the second derivative 42 is returned. Thus, the exhaust gas is along an approximately closed circuit through the exhaust gas cooler 30 and back again through the derivative 40 into the exhaust tract conductive. This leads to a particularly compact and space-saving mountable exhaust gas recirculation arrangement 10 ,

By "spatially close" is meant a distance A of at most 50 cm, preferably a distance A of 10 cm or less. The derivative is running 40 preferably along the entire longitudinal dimension of the cooling section 32 at a distance A of less than 50 cm thereto. Such a small distance between the derivative 40 and the cooling section 32 This leads to that by the derivative 40 flowing exhaust gas through the in the cooling section 32 existing cooling medium is cooled once more.

At the in 1a illustrated embodiment branches the derivative 40 downstream of the exhaust gas cooler 30 from the return channel 20 from, passes through a curve of about 180 ° and then runs externally spatially close to the exhaust gas cooler 30 back towards the junction 22 until she enters the second derivative 42 opens. Over more than 50% of its dimension, the discharge runs approximately parallel to the return channel.

Alternatively, the derivative is located 40 directly outside on a housing 34 the radiator 30 on, so that the distance A between the derivative 40 and the cooling section 32 is further minimized.

In 2 is the exhaust gas cooler 30 a second, particularly preferred embodiment of the invention. In this embodiment, the derivative runs 40 at least in sections inside the case 34 the radiator 30 so that the waste heat from the drainage 40 flowing exhaust gas can be dissipated more efficiently to the cooling medium. If the downstream of the radiator 30 arranged first valve means 50 is closed, this is in the return direction R from the cooling section 32 exiting exhaust gas in a funnel-shaped exit area 39 of the exhaust gas cooler 30 deflected radially outwards and flows into the concentric around the cooling section 32 running derivative 40 ,

Preferably, the derivative is 40 at least partially as coaxial with the cooling section 32 between the cooling section 32 and the housing 34 running, gas-tight gap formed. The intermediate space surrounds the substantially cylindrically shaped cooling section 32 with tubular cooling channels 35 cylinder jacket-shaped, wherein the distance between the outer wall of the cooling section 32 and the housing 34 through annular spacers 36 with flow openings 37 can be ensured. About the flow openings 37 the exhaust gas exits the exit area 39 into the derivative 40 one. Through the gap becomes the exhaust gas cooler 30 further insulated to the outside.

The derivative 40 can also be in the case in other ways 34 the radiator 30 be integrated, and does not necessarily run concentrically around the cooling section 32 , It is conceivable, for example, a derivative 40 in the form of one in the housing 34 returning pipe, the outside of the cooling section 32 and / or through the cooling section 32 passes through o. .. Like ..

In 3 is a third embodiment of an exhaust gas recirculation arrangement according to the invention 10 shown in a perspective view. Important in terms of space savings is the vertical installation of the return channel 20 to the internal combustion engine (not shown), so that both the return direction R and the opposite direction X are substantially vertical.

The exhaust gas enters from below into a pipe component 90 trained exhaust manifold. Depending on the position of the first valve device 52 the exhaust gas flows in the direction of the exhaust gas cooler 30 in the vertical return channel 20 and / or to the left towards the exhaust system 60 into the second derivative 42 one. Depending on the position of the first valve device 50 downstream of the exhaust gas cooler 30 the exhaust gas is returned up into the fresh air tract and / or into the first discharge 40 initiated, where it flows vertically downwards in the opposite direction X until it is at an orifice 24 in the pipe component 90 returned and the exhaust system 60 is supplied.

The derivative 40 runs over about 50% of its dimension parallel to the return channel 20 , and at a distance A of less than 50 cm.

LIST OF REFERENCE NUMBERS

10

Exhaust gas recirculation arrangement

20

Return channel

22

branching

24

opening point

30

exhaust gas cooler

32

cooling section

34

cooler housing

35

cooling channels

36

spacer

37

Flow openings

39

output range

40

derivation

50

first valve device

52

second valve device

60

exhaust system

80

particulate Filter

90

pipe component

R

Return direction

X

Opposite direction with respect to the return direction

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 102009058609 A1 [0003, 0004, 0010, 0024]

Claims (13)

Exhaust gas recirculation arrangement ( 10 ) for the recirculation of exhaust gas of a combustion device into the gas flow to be supplied to the combustion device, which in a return channel ( 20 ) for the recirculated exhaust gas in a return direction (R) can be flowed through the exhaust gas cooler ( 30 ), characterized by a downstream of a cooling section ( 32 ) of the exhaust gas cooler ( 30 ) from the return channel ( 20 ) branching derivative ( 40 ) for the discharge of non-recirculating exhaust gas from the return channel ( 20 ), which at least partially spatially close to the cooling section ( 32 ) and substantially opposite (X) of the return direction (R) of exhaust gas can be flowed through. Exhaust gas recirculation arrangement according to claim 1, characterized in that the distance (A) between the cooling section ( 32 ) and the derivative ( 40 ) is set up so that by the derivative ( 40 ) flowing exhaust gas through the cooling section ( 32 ) of the exhaust gas cooler ( 30 ) is coolable. Exhaust gas recirculation arrangement according to claim 1 or 2, characterized in that the distance (A) between the cooling section ( 32 ) and the derivative ( 40 ) is at least in sections, preferably over the entire longitudinal extent of the cooling section, smaller than 50 cm, preferably smaller than 25 cm, particularly preferably smaller than 10 cm, in particular that the derivative ( 40 ) directly to the cooling section ( 32 ) adjoins. Exhaust gas recirculation arrangement according to at least one of the preceding claims, characterized in that the derivative ( 40 ) at least in sections within a housing ( 34 ) of the exhaust gas cooler ( 30 ) runs. Exhaust gas recirculation arrangement according to claim 4, characterized in that the derivative ( 40 ) at least in sections concentrically around the cooling section ( 32 ) of the exhaust gas cooler ( 30 ) runs around. Exhaust gas recirculation arrangement according to claim 4 or 5, characterized in that the exhaust gas cooler ( 30 ) a tube cooler with a cooling section ( 32 ) with approximately parallel cooling channels ( 35 ), wherein between the cooling section ( 32 ) and the radiator housing ( 34 ) a preferably substantially cylindrical annular space is formed, the at least a portion of the derivative ( 40 ). Exhaust gas recirculation arrangement according to one of claims 4 to 6, characterized by at least one between the radiator housing ( 34 ) and the cooling section ( 32 ) arranged, preferably approximately annularly shaped spacers ( 36 ) with flow openings ( 37 ), which from the into the derivative ( 40 ) flowing through the exhaust gas can be flowed through. Exhaust gas recirculation arrangement according to one of the preceding claims, characterized by a first valve device ( 50 ) in the return channel ( 20 ) downstream of the branching derivative ( 40 ) for adjusting the amount of exhaust gas to be recirculated and thus also by the derivative ( 40 ) leading to exhaust gas amount. Exhaust gas recirculation arrangement according to at least one of the preceding claims, characterized in that upstream of the exhaust gas cooler ( 30 ) a branch point ( 22 ), at which a second derivative ( 42 ) is arranged for the discharge of non-recirculating exhaust gas, wherein preferably the derivative ( 40 ) at a confluence point ( 24 ) into the second derivative ( 42 ). Exhaust gas recirculation arrangement according to claim 9, characterized in that the distance between the branch point ( 22 ) and the mouth ( 24 ) is smaller than 50 cm, preferably smaller than 30 cm, in particular smaller than 15 cm. Exhaust gas recirculation arrangement according to claim 9 or 10, characterized by a second valve device ( 52 ) in the second derivative ( 42 ) and / or in the first derivative ( 40 ) for adjusting the exhaust gas flow through the second derivative ( 42 ) and thus also the remaining exhaust gas flow through the exhaust gas cooler ( 30 ) and / or for adjusting the of the derivative ( 40 ) into the second derivative ( 42 ) opening exhaust stream. Exhaust gas recirculation arrangement according to one of the preceding claims, characterized in that the derivative ( 40 ) at least in sections, preferably over more than 30%, in particular over more than 50% of their extension, substantially parallel to the return channel ( 20 ) runs. Internal combustion engine comprising an exhaust gas recirculation arrangement ( 10 ) according to one of the preceding claims, characterized in that the derivative ( 40 ) is arranged such that it the non-recirculating exhaust gas of an exhaust system ( 60 ) and / or discharges into the environment, wherein the return direction is preferably in the direction of gravity.

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