WO2021023418A1 - Exhaust gas aftertreatment system for an internal combustion engine of a motor vehicle - Google Patents

Exhaust gas aftertreatment system for an internal combustion engine of a motor vehicle Download PDF

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Publication number
WO2021023418A1
WO2021023418A1 PCT/EP2020/066074 EP2020066074W WO2021023418A1 WO 2021023418 A1 WO2021023418 A1 WO 2021023418A1 EP 2020066074 W EP2020066074 W EP 2020066074W WO 2021023418 A1 WO2021023418 A1 WO 2021023418A1
Authority
WO
WIPO (PCT)
Prior art keywords
exhaust gas
flow
aftertreatment system
flow guide
exhaust
Prior art date
Application number
PCT/EP2020/066074
Other languages
German (de)
French (fr)
Inventor
Dirk Heilig
Otto Adrian PITTNER
Tobias SCHULLER
Lena BRAUN
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2021023418A1 publication Critical patent/WO2021023418A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/21—Mixing gases with liquids by introducing liquids into gaseous media
    • B01F23/213—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/10—Mixing by creating a vortex flow, e.g. by tangential introduction of flow components
    • B01F25/103—Mixing by creating a vortex flow, e.g. by tangential introduction of flow components with additional mixing means other than vortex mixers, e.g. the vortex chamber being positioned in another mixing chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
    • B01F25/3141—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit with additional mixing means other than injector mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • B01F25/452—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces
    • B01F25/4521—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces the components being pressed through orifices in elements, e.g. flat plates or cylinders, which obstruct the whole diameter of the tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • B01F25/452—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces
    • B01F25/4522—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces the components being pressed through porous bodies, e.g. flat plates, blocks or cylinders, which obstruct the whole diameter of the tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • B01F25/452—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces
    • B01F25/4523—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces the components being pressed through sieves, screens or meshes which obstruct the whole diameter of the tube
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to an exhaust gas aftertreatment system for an internal combustion engine of a motor vehicle, with an exhaust gas duct through which an exhaust gas from the internal combustion engine can flow, an exhaust gas purifier, in particular a catalytic converter, being arranged in the exhaust gas duct, with an injector upstream of the exhaust gas purifier into the exhaust gas duct for injecting an exhaust gas aftertreatment agent the exhaust gas duct is assigned, and a mixing device with a swirl generator for mixing the injected exhaust gas aftertreatment agent with the exhaust gas is arranged upstream of the exhaust gas cleaner in terms of flow between the injector and the exhaust gas cleaner.
  • an exhaust gas purifier in particular a catalytic converter
  • Exhaust gas aftertreatment systems of the type mentioned at the beginning are known from the prior art.
  • compact mixing sections for introducing an exhaust gas aftertreatment agent or reducing agent, in particular in the form of an aqueous urea solution are known upstream of a catalytic converter for reducing emissions.
  • Corresponding exhaust gas aftertreatment systems are already known, for example, from the laid-open specification DE 102011 077 156 A1 or DE 102016211 703 A1.
  • the exhaust gas aftertreatment system according to the invention with the features of claim 1 has the advantage that the swirl desired for mixing the exhaust gas aftertreatment agent with the exhaust gas is dissolved before reaching the exhaust gas cleaner, in particular catalyst, for example SCR catalyst, so that the exhaust gas flow with the mixed exhaust gas aftertreatment agent at least in Strikes the exhaust gas cleaner essentially axially.
  • the exhaust gas cleaner in particular catalyst, for example SCR catalyst
  • This also prevents solid particles such as chips, fibers or the like, driven by the swirl, from permanently wearing out the catalyst surface.
  • this is achieved in that a swirl destroyer is arranged between the swirl generator and the exhaust gas cleaner for setting an axial flow against the exhaust gas cleaner.
  • the swirl annihilator calms down the exhaust gas flow that was previously swirled and converts it to an axially flowing exhaust gas flow, which acts axially on the exhaust gas cleaner, so that a swirl flow or circulation flow at the catalyst inlet surface does not occur. It is true that dirt particles or the like are still pressed axially against the exhaust gas cleaner or its inlet surface, but there is no friction caused by a twist. As a result, despite the advantageous mixing section that makes use of the swirl effect, a long service life of the exhaust gas cleaner and thus the exhaust gas aftertreatment system as a whole is guaranteed.
  • the swirl annihilator has a disc which is at least substantially perpendicular to the longitudinal extent of the exhaust gas channel and which extends over the entire flow cross-section of the exhaust gas channel and has at least one flow guide opening for untwisting the flow.
  • the disk thus at least essentially closes the flow path through the exhaust gas duct, but has a flow guide opening through which the exhaust gas mixture can pass through the disk. Due to the design as a flow guide opening and an advantageous placement of the The flow guide opening in the disk ensures that the swirl flow is dissolved and converted to an axial flow.
  • a multiplicity of flow guide openings are preferably formed in the disk in order to offer an overall sufficiently large flow cross-section through which the exhaust gas flow is not adversely affected.
  • the flow guide openings are preferably formed in the disk in such a way that they form a first flow area with a first flow resistance and at least one second flow area with a second flow resistance which is smaller than the first flow resistance. Due to the areas with different flow resistances, the rotating exhaust gas mass flow or one provided with a swirl is deliberately slowed down and diverted so that an at least essentially axial flow is present downstream of the disk or swirl destroyer. This is achieved, for example, in that the first throughflow area is arranged where the fastest or strongest exhaust gas mass flow is expected when reaching the pane. This can depend on the operating conditions of the internal combustion engine.
  • the distance between the disk and the outlet of the swirl generator as well as the distance from the downstream exhaust gas cleaner must also be observed in order to ensure an optimal positioning of the first flow area.
  • several first flow areas can be present in the disk.
  • the first throughflow area is ensured, for example, by throughflow guide openings which have a smaller flow cross section than throughflow guide openings of the second throughflow region, with the same number of throughflow openings.
  • At least some of the flow-through openings have a circular or oval-shaped cross section. This enables the exhaust gas mass flow to flow advantageously through the pane.
  • at least some of the throughflow guide openings have a polygonal, in particular rectangular, triangular or square cross section. Due to the different opening shapes, the function of the swirl destroyer can be optimally adapted to the respective application or to the existing boundary conditions.
  • the disk has at least a multiplicity of grids forming the flow guide openings.
  • the grille provides a large number of throughflow guide openings in a simple manner, the mesh size of the grille defining the flow cross section of the individual flow guide openings.
  • the disk particularly preferably has a first grid with a first mesh size and a second grid with a second mesh size, the second mesh size being larger than the first mesh size.
  • the first grid forms the first flow area and the second grid forms the second flow area with a reduced flow resistance compared to the first flow area.
  • the two grids are preferably one behind the other, at least in some areas, viewed in the direction of flow. This enables the flow area to be easily adjusted. In addition, there is a space-saving and simple design of the swirl destroyer.
  • the grids are preferably arranged next to one another.
  • the disk is particularly short in the axial direction and has a simple design.
  • each flow guide opening is assigned at least one flow guide element downstream of the disk.
  • the flow exiting through the respective flow guide opening is further directed or directed by the respective flow guide element, so that the axial flow towards the exhaust gas cleaner can be easily guaranteed.
  • At least one flow guide element is particularly preferably designed as a tubular flow channel. This ensures a particularly simple control of the exhaust gas flow.
  • At least one flow guide element is designed as a flat or curved flow guide plate, in particular as a flow guide tongue bent out of the disk. This also ensures that the exhaust gas flow is advantageously influenced after it has penetrated the respective flow guide opening.
  • At least one of the flow guide openings is assigned a plurality of identical or different flow guide elements in order to ensure an advantageous flow control.
  • Figure 1 shows an exhaust gas aftertreatment system in a simplified
  • FIG. 2 a first embodiment of an advantageous swirl destroyer of the exhaust gas aftertreatment system, in a simplified perspective illustration
  • Figure 3 shows a second embodiment of the swirl destroyer
  • Figure 4 shows a third embodiment of the twist waiver
  • Figure 5 shows a fourth embodiment of the swirl destroyer
  • FIG. 6 a fifth embodiment of the swirl destroyer
  • Figure 7 shows a sixth embodiment of the swirl destroyer, each in a simplified representation
  • FIG. 8 shows an advantageous first development of the swirl destroyer in a perspective illustration
  • FIG. 9 shows an advantageous second development of the swirl destroyer in a perspective illustration
  • FIG. 10 an advantageous third exemplary embodiment of the swirl destroyer in a perspective illustration.
  • Figure 1 shows in a simplified longitudinal section an advantageous exhaust gas aftertreatment system 1, which is downstream of an internal combustion engine of a motor vehicle, which are not shown here, so that the exhaust gas from the internal combustion engine can flow through it.
  • the exhaust gas aftertreatment system 1 has an exhaust gas duct 2, which is connected on the input side to the internal combustion engine, so that the exhaust gas flows into the exhaust gas duct 2 according to an arrow 3.
  • a gas duct 2 which is connected on the input side to the internal combustion engine, so that the exhaust gas flows into the exhaust gas duct 2 according to an arrow 3.
  • the catalytic converter 5 is designed as an SCR catalytic converter and is used for the selective catalytic reduction (SCR) of harmful substances contained in the exhaust gas of the internal combustion engine.
  • SCR selective catalytic reduction
  • the exhaust gas is mixed with a liquid exhaust gas aftertreatment agent before it flows through the catalytic converter 5, which, together with the exhaust gas in the catalytic converter 5, works to reduce pollutant emissions.
  • an injector 6 is also assigned to the exhaust gas duct 2, by means of which the liquid exhaust gas aftertreatment agent can be injected into the exhaust gas duct 2 in a metered manner.
  • a mixing section 7 is formed in the exhaust gas duct 2 parallel or downstream of the injector 6, in which an advantageous Mixing of the exhaust gas aftertreatment agent with the exhaust gas takes place.
  • a swirl generator 8 is arranged in the mixing section, which turns the exhaust gas flow into a rotating flow, ie a flow with a swirl, whereby the exhaust gas aftertreatment agent is better mixed with the exhaust gas flow.
  • a swirl destroyer 9 Downstream of the swirl generator there is also a swirl destroyer 9, which ensures that the swirled flow is rectified again or is deflected into an axial flow so that the mixed exhaust gas with the exhaust gas aftertreatment agent strikes the inlet surface of the catalytic converter 5 at least essentially axially. This ensures that droplets or (dirt) particles carried along with the exhaust gas flow do not hit the catalyst inlet surface at an angle due to the swirl of the exhaust gas flow and / or rotate along or be ground, which could damage the catalyst 5. Instead, they are only pressed axially against the entry surface and do not add any further damage due to the significantly higher mechanical stability of the catalyst substrate in the axial direction.
  • the swirl destroyer 9 can be designed differently.
  • the swirl annihilator 9 according to the present exemplary embodiments has a disk 10, the outside diameter of which at least essentially corresponds to the inside diameter of the exhaust gas duct 2, so that the exhaust gas cannot flow in front of the disk 10.
  • a plurality of flow guide openings 11, which allow the exhaust gas flow to pass through to the catalytic converter 5, are formed in the disk 10.
  • FIG. 2 shows a first exemplary embodiment, according to which the disk 10 is produced as a perforated disk in order to realize the multiplicity of flow guide openings 11.
  • the exhaust gas flow is directed at least substantially in the same direction through the many flow guide openings 11 and is directed axially onto the catalytic converter 5.
  • the perforation can be produced on the pane 10 subsequently.
  • the disk has a lattice structure or a lattice, the mesh size of which defines the flow cross section of the individual flow guide opening 11.
  • FIG. 3 shows a second exemplary embodiment of the swirl destroyer 9, which differs from the previous exemplary embodiment in that the disk 10 is made from an open-pored foam, so that the exhaust gas stream flows through the pores of the disk 10 to the catalytic converter 5.
  • the disk has the same thickness over the entire surface, so that the same flow path is achieved at every point on the disk 10.
  • FIG. 4 shows a third exemplary embodiment, that of the disk 10, which differs from the preceding exemplary embodiments in that flow guide openings 11 with different flow cross-sections are formed in the disk 10.
  • the flow guide openings 11 are arranged in such a way that a first flow area 12 is formed with a first group of flow guide openings 11 and a second flow area 13 is formed with a second group of flow openings.
  • the throughflow opening area 12 is framed by a dashed line in FIG.
  • the flow guide openings 11 in the flow area 12 each have a smaller flow cross section than the flow guide openings 11 in the remaining area or the flow area 13 of the disk 10. This results in a higher flow resistance, which counteracts the exhaust gas flow, arises on the disk 10 in the flow area 12 than in the second flow area 13.
  • This uneven design of the disc 10 or swirl destroyer 9 ensures that specific areas of the exhaust gas flow are slowed down more strongly than others in order to ensure that the exhaust gas flow is rectified in the axial direction.
  • the arrangement and design of the first flow area 12 is dependent on the position of the outlet of the swirl generator 8, the distance between the disk 10 and the swirl generator 8 and the catalytic converter 5, and preferably also depends on known ones Operating conditions of the internal combustion engine selected to ensure the best possible effect for rectifying the flow in the axial direction.
  • FIG. 5 shows a fourth exemplary embodiment of the swirl annihilator 9, which differs from the previous exemplary embodiment in that the flow guide openings 11 do not have a circular flow cross section, but rather a polygonal one.
  • the throughflow openings 11 in the second throughflow region 13 are triangular, while the throughflow openings 11 in the first throughflow region 12 are rectangular or strip-shaped. This also has an advantageous effect on the flow behavior of the exhaust gas flow in the direction of the catalytic converter 5.
  • FIG. 6 shows a fifth exemplary embodiment of the swirl destroyer 9, in which the disc 10 has a grid or a grid structure in order to form the throughflow openings 11.
  • the disk 10 has two different lattice structures that form the flow-through areas 12 and 13, the lattice structure and the flow-through area 12 having smaller mesh sizes than the lattice structure in the flow-through area 13 in order to achieve the effect described above.
  • the disk 10 only has the lattice structure according to the flow-through area 13, and downstream or upstream this lattice structure has a second lattice structure, which covers the disk 10 in areas in the flow-through area 12, and thereby realizes reduced flow cross-sections, the second lattice structure preferably having a smaller mesh size.
  • FIG. 7 shows a sixth exemplary embodiment of the swirl destroyer 9, in which the disk 10, as in the exemplary embodiment of FIG. 3, is made of a porous or open-pored foam, which, however, offers different flow resistances.
  • the disk 10 or the open-pored foam has an increased thickness or depth compared to the flow-through region 13, so that a longer flow path is formed for the exhaust gas flow, whereby an increased flow resistance arises in the flow area 12.
  • FIG. 8 shows a first advantageous further development of the swirl destroyer 9, according to which the respective flow guide opening 11 is assigned a flow channel 14 as an air guide element 15 downstream on the disk, through which the exhaust gas flow is directed.
  • the flow channel is in particular aligned perpendicular to the plane of the disk 10, so that the exhaust gas flow is guided axially to the catalytic converter 5.
  • the exhaust gas duct is oriented perpendicular to the inlet surface of the catalytic converter 5, regardless of the orientation of the disk 10 itself.
  • the respective flow guide opening 11 is assigned a plurality of air guide elements 15, here in the form of triangular guide plates 16, which surround the flow guide opening 11 at the edge and thereby guide the exhaust gas flow axially to the inlet surface of the catalytic converter 5.
  • the respective throughflow opening 11 which in this case is rectangular, is assigned only one flow guide element 15 in the form of a flow guide tongue 17 bent out of disk 10, which is oriented such that the Exhaust gas flow is guided axially to the catalyst 5.
  • the swirl annihilator 9 is preferably made of a flat material, for example a flat or straight sheet metal, or a curved flat material, for example a cambered sheet metal to improve the thermo-mechanical durability.
  • the swirl shredder 9 can also consist of a three-dimensional structure, such as a rectangular grid,
  • the swirl destroyer 9 is made from metallic or ceramic materials or from composite materials.
  • the ratio of the cross-sectional area of all flow guide openings 11 to the total area of the disk 10 is preferably between 0.1 and 0.55, particularly preferably between 0.25 and 0.3.
  • the flow guide openings 11 can be arranged distributed uniformly or unevenly, depending on which effect is to be achieved.
  • the disk 10 or the swirl annihilator 9 is preferably positioned in the exhaust gas duct 2 in such a way that it has a distance, in particular an axial distance, S1 from the outlet of the swirl generator 8, which is in a range from 1/10 x D to 1/3 x D, in particular 1/6 x D, where D is the inner diameter of the exhaust gas duct 2.
  • the distance between the swirl destroyer 9 and the inlet surface of the catalytic converter 5 is preferably in a range from 1/20 x D to 1/4 x D, in particular about 1/10 x D.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention relates to an exhaust gas aftertreatment system (1) for an internal combustion engine of a motor vehicle, comprising an exhaust gas channel (2), through which an exhaust gas of the internal combustion engine can flow, wherein: an exhaust gas cleaner, in particular a catalytic converter (5), is arranged in the exhaust gas channel (2); upstream of the exhaust gas cleaner, an injector (6) for injecting an exhaust gas aftertreatment agent into the exhaust gas channel (2) is associated with the exhaust gas channel (2); and a mixing device having a swirl generator (8) for mixing the injected exhaust gas aftertreatment agent with the exhaust gas upstream of the exhaust gas cleaner is arranged fluidically between the injector (6) and the exhaust gas cleaner. According to the invention, a swirl eliminator (9) for establishing an axial flow incident on the exhaust gas cleaner is arranged between the swirl generator (8) and the exhaust gas cleaner.

Description

Beschreibung description
Titel title
Abgasnachbehandlungssystem für eine Brennkraftmaschine einesExhaust aftertreatment system for an internal combustion engine
Kraftfahrzeugs Motor vehicle
Die Erfindung betrifft ein Abgasnachbehandlungssystem für eine Brennkraftmaschine eines Kraftfahrzeugs, mit einem Abgaskanal, der von einem Abgas der Brennkraftmaschine durchströmbar ist, wobei in dem Abgaskanal ein Abgasreiniger, insbesondere Katalysator, angeordnet ist, wobei stromaufwärts des Abgasreinigers ein Injektor dem Abgaskanal zum Einspritzen eines Abgasnachbehandlungsmittels in den Abgaskanal zugeordnet ist, und wobei strömungstechnisch zwischen dem Injektor und dem Abgasreiniger eine Mischeinrichtung mit einem Drallerzeuger zum Vermischen des eingespritzten Abgasnachbehandlungsmittels mit dem Abgas stromaufwärts des Abgasreinigers angeordnet ist. The invention relates to an exhaust gas aftertreatment system for an internal combustion engine of a motor vehicle, with an exhaust gas duct through which an exhaust gas from the internal combustion engine can flow, an exhaust gas purifier, in particular a catalytic converter, being arranged in the exhaust gas duct, with an injector upstream of the exhaust gas purifier into the exhaust gas duct for injecting an exhaust gas aftertreatment agent the exhaust gas duct is assigned, and a mixing device with a swirl generator for mixing the injected exhaust gas aftertreatment agent with the exhaust gas is arranged upstream of the exhaust gas cleaner in terms of flow between the injector and the exhaust gas cleaner.
Stand der Technik State of the art
Abgasnachbehandlungssysteme der eingangs genannten Art sind aus dem Stand der Technik bekannt. Für die Abgasnachbehandlung von Abgasen von Brennkraftmaschinen in Kraftfahrzeugen ist es bekannt, kompakte Mischstrecken zur Einbringung eines Abgasnachbehandlungsmittels oder Reduktionsmittels, insbesondere in Form einer wässrigen Harnstofflösung, stromaufwärts eines Katalysators zur Emissionsreduzierung bekannt. Entsprechende Abgasnachbehandlungssysteme sind beispielsweise aus der Offenlegungsschrift DE 102011 077 156 Al oder DE 102016211 703 Al bereits bekannt. Exhaust gas aftertreatment systems of the type mentioned at the beginning are known from the prior art. For exhaust gas aftertreatment of exhaust gases from internal combustion engines in motor vehicles, compact mixing sections for introducing an exhaust gas aftertreatment agent or reducing agent, in particular in the form of an aqueous urea solution, are known upstream of a catalytic converter for reducing emissions. Corresponding exhaust gas aftertreatment systems are already known, for example, from the laid-open specification DE 102011 077 156 A1 or DE 102016211 703 A1.
Offenbarung der Erfindung Das erfindungsgemäße Abgasnachbehandlungssystem mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass der zur Vermischung des Abgasnachbehandlungsmittels mit dem Abgas gewünschte Drall vor dem Erreichen des Abgasreinigers, insbesondere Katalysator, beispielsweise SCR- Katalysator, aufgelöst wird, sodass der Abgasstrom mit dem vermischten Abgasnachbehandlungsmittel zumindest im Wesentlichen axial auf den Abgasreiniger trifft. Dadurch wird verhindert, dass aufgrund des Dralls flüssige Tropfen schräg auf dem Abgasreiniger auftreffen und zu Schädigungen, wie Ausbrüchen, führen können. Auch wird somit verhindert, dass feste Partikel, wie beispielsweise Späne, Fasern oder Ähnliches durch den Drall angetrieben reibend die Katalysatorfläche auf Dauer verschleißen. Erfindungsgemäß wird dies dadurch erreicht, dass zwischen dem Drallerzeuger und dem Abgasreiniger ein Drallvernichter zum Einstellen einer axialen Anströmung des Abgasreinigers angeordnet ist. Durch den Drallvernichter wird somit der zuvor in Drall versetzte Abgasstrom nach dem erfolgten Mischvorgang wieder beruhigt und zu einem axial strömenden Abgasstrom gewandelt, welcher den Abgasreiniger entsprechend axial beaufschlagt, sodass eine Drallströmung beziehungsweise Zirkulationsströmung an der Katalysatoreintrittsfläche unterbleibt. Zwar werden dadurch noch Schmutzpartikel oder dergleichen axial gegen den Abgasreiniger beziehungsweise dessen Eintrittsfläche gedrückt, jedoch unterbleibt eine aufgrund eines Dralls entstehende Reibung. Dadurch wird trotz der vorteilhaften Mischstrecke, die den Dralleffekt ausnutzt, eine hohe Lebensdauer des Abgasreinigers und damit des Abgasnachbehandlungssystems insgesamt gewährleistet. Disclosure of the invention The exhaust gas aftertreatment system according to the invention with the features of claim 1 has the advantage that the swirl desired for mixing the exhaust gas aftertreatment agent with the exhaust gas is dissolved before reaching the exhaust gas cleaner, in particular catalyst, for example SCR catalyst, so that the exhaust gas flow with the mixed exhaust gas aftertreatment agent at least in Strikes the exhaust gas cleaner essentially axially. This prevents liquid droplets from hitting the exhaust gas cleaner at an angle due to the swirl and causing damage such as breakouts. This also prevents solid particles such as chips, fibers or the like, driven by the swirl, from permanently wearing out the catalyst surface. According to the invention, this is achieved in that a swirl destroyer is arranged between the swirl generator and the exhaust gas cleaner for setting an axial flow against the exhaust gas cleaner. After the mixing process, the swirl annihilator calms down the exhaust gas flow that was previously swirled and converts it to an axially flowing exhaust gas flow, which acts axially on the exhaust gas cleaner, so that a swirl flow or circulation flow at the catalyst inlet surface does not occur. It is true that dirt particles or the like are still pressed axially against the exhaust gas cleaner or its inlet surface, but there is no friction caused by a twist. As a result, despite the advantageous mixing section that makes use of the swirl effect, a long service life of the exhaust gas cleaner and thus the exhaust gas aftertreatment system as a whole is guaranteed.
Gemäß einer bevorzugten Weiterbildung der Erfindung weist der Drallvernichter eine in dem Abgaskanal zumindest im Wesentlichen senkrecht zur Längserstreckung des Abgaskanals ausgerichtete Scheibe auf, die sich über den gesamten Durchströmungsquerschnitt des Abgaskanals erstreckt und wenigstens eine Strömungsleitöffnung zur Entdrallung der Strömung aufweist.According to a preferred development of the invention, the swirl annihilator has a disc which is at least substantially perpendicular to the longitudinal extent of the exhaust gas channel and which extends over the entire flow cross-section of the exhaust gas channel and has at least one flow guide opening for untwisting the flow.
Die Scheibe verschließt somit zumindest im Wesentlichen den Strömungsweg durch den Abgaskanal, weist jedoch eine Strömungsleitöffnung auf, durch welche das Abgasgemisch durch die Scheibe hindurchtreten kann. Durch die Ausbildung als Strömungsleitöffnung und durch eine vorteilhafte Platzierung der Strömungsleitöffnung in der Scheibe wird gewährleistet, dass die Drallströmung aufgelöst und zu einer axialen Strömung gewandelt wird. The disk thus at least essentially closes the flow path through the exhaust gas duct, but has a flow guide opening through which the exhaust gas mixture can pass through the disk. Due to the design as a flow guide opening and an advantageous placement of the The flow guide opening in the disk ensures that the swirl flow is dissolved and converted to an axial flow.
Vorzugsweist ist in der Scheibe eine Vielzahl von Strömungsleitöffnungen ausgebildet, um einen insgesamt ausreichend großen Durchströmungsquerschnitt zu bieten, durch welchen der Abgasstrom nicht nachteilig behindert wird. A multiplicity of flow guide openings are preferably formed in the disk in order to offer an overall sufficiently large flow cross-section through which the exhaust gas flow is not adversely affected.
Vorzugsweise sind die Strömungsleitöffnungen derart in der Scheibe ausgebildet, dass sie einen ersten Durchströmungsbereich mit einem ersten Durchströmungswiderstand bilden und zumindest einen zweiten Durchströmungsbereich mit einem zweiten Durchströmungswiderstand, der kleiner ist als der erste Durchströmungswiderstand. Durch die Bereiche mit unterschiedlichen Durchströmungswiderständen wird der rotierende beziehungsweise mit einem Drall versehene Abgasmassenstrom gezielt ausgebremst und umgeleitet, sodass stromabwärts der Scheibe beziehungsweise des Drallvernichters eine zumindest im Wesentlichen axiale Strömung vorliegt. Dies wird beispielsweise dadurch erreicht, dass der erste Durchströmungsbereich dort angeordnet ist, wo mit dem schnellsten oder stärksten Abgasmassenstrom beim Erreichen der Scheibe gerechnet wird. Dies kann von den Betriebsbedingungen der Brennkraftmaschine abhängen. Auch ist dabei der Abstand der Scheibe zu dem Auslass des Drallerzeugers sowie der Abstand zu dem stromabwärts liegenden Abgasreiniger zu beachten, um eine optimale Positionierung des ersten Durchströmungsbereichs zu gewährleisten. Optional können in der Scheibe mehrere erste Durchströmungsbereiche vorhanden sein. Der erste Durchströmungsbereich wird beispielsweise durch Durchströmungsleitöffnungen gewährleistet, die einen kleineren Durchströmungsquerschnitt aufweisen als Durchströmungsleitöffnungen des zweiten Durchströmungsbereichs, bei gleicher Anzahl von Durchströmungsöffnungen. The flow guide openings are preferably formed in the disk in such a way that they form a first flow area with a first flow resistance and at least one second flow area with a second flow resistance which is smaller than the first flow resistance. Due to the areas with different flow resistances, the rotating exhaust gas mass flow or one provided with a swirl is deliberately slowed down and diverted so that an at least essentially axial flow is present downstream of the disk or swirl destroyer. This is achieved, for example, in that the first throughflow area is arranged where the fastest or strongest exhaust gas mass flow is expected when reaching the pane. This can depend on the operating conditions of the internal combustion engine. The distance between the disk and the outlet of the swirl generator as well as the distance from the downstream exhaust gas cleaner must also be observed in order to ensure an optimal positioning of the first flow area. Optionally, several first flow areas can be present in the disk. The first throughflow area is ensured, for example, by throughflow guide openings which have a smaller flow cross section than throughflow guide openings of the second throughflow region, with the same number of throughflow openings.
Weiterhin ist bevorzugt vorgesehen, dass zumindest einige der Durchströmungsleitöffnungen einen kreisförmigen oder ovalförmigen Querschnitt aufweisen. Dies ermöglicht ein vorteilhaftes Durchströmen des Abgasmassenstroms durch die Scheibe. Alternativ oder zusätzlich weisen zumindest einige der Durchströmungsleitöffnungen einen mehreckförmigen, insbesondere rechteckförmigen, dreieckförmigen oder quadratischen Querschnitt auf. Durch die verschiedenen Öffnungsformen lässt sich die Funktion des Drallvernichters optimal an dem jeweiligen Anwendungsfall beziehungsweise an die jeweils vorhandenen Randbedingungen anpassen. Furthermore, it is preferably provided that at least some of the flow-through openings have a circular or oval-shaped cross section. This enables the exhaust gas mass flow to flow advantageously through the pane. Alternatively or additionally, at least some of the throughflow guide openings have a polygonal, in particular rectangular, triangular or square cross section. Due to the different opening shapes, the function of the swirl destroyer can be optimally adapted to the respective application or to the existing boundary conditions.
Weiterhin ist bevorzugt vorgesehen, dass die Scheibe zumindest eine Vielzahl der Strömungsleitöffnungen bildendes Gitter aufweist. Durch das Gitter wird auf einfache Art und Weise eine hohe Anzahl von Durchströmungsleitöffnungen zur Verfügung gestellt, wobei die Maschengröße des Gitters den Durchströmungsquerschnitt der einzelnen Strömungsleitöffnung definiert. Furthermore, it is preferably provided that the disk has at least a multiplicity of grids forming the flow guide openings. The grille provides a large number of throughflow guide openings in a simple manner, the mesh size of the grille defining the flow cross section of the individual flow guide openings.
Besonders bevorzugt weist die Scheibe ein erstes Gitter auf, mit einer ersten Maschengröße, und ein zweites Gitter mit einer zweiten Maschengröße, wobei die zweite Maschengröße größer als die erste Maschengröße ist. Dadurch bildet das erste Gitter den ersten Durchströmungsbereich und das zweite Gitter den zweiten Durchströmungsbereich mit einem im Vergleich zum ersten Durchströmungsbereich reduzierten Strömungswiderstand. The disk particularly preferably has a first grid with a first mesh size and a second grid with a second mesh size, the second mesh size being larger than the first mesh size. As a result, the first grid forms the first flow area and the second grid forms the second flow area with a reduced flow resistance compared to the first flow area.
Dazu liegen die beiden Gitter bevorzugt zumindest bereichsweise in Strömungsrichtung gesehen hintereinander. Dadurch ist ein einfaches Verstellen des Durchströmungsbereiches ermöglicht. Darüber hinaus ergibt sich eine bauraumsparende und einfache Ausbildung des Drallvernichters. For this purpose, the two grids are preferably one behind the other, at least in some areas, viewed in the direction of flow. This enables the flow area to be easily adjusted. In addition, there is a space-saving and simple design of the swirl destroyer.
Alternativ sind die Gitter in Strömungsrichtung gesehen bevorzugt nebeneinander angeordnet. Dadurch ist die Scheibe in axialer Richtung besonders kurz und ist konstruktiv einfach gestaltet. Alternatively, viewed in the direction of flow, the grids are preferably arranged next to one another. As a result, the disk is particularly short in the axial direction and has a simple design.
Weiterhin ist bevorzugt vorgesehen, dass jeder Strömungsleitöffnung zumindest ein Strömungsleitelement stromabwärts der Scheibe zugeordnet ist. Durch das jeweilige Strömungsleitelement wird die durch die jeweilige Strömungsleitöffnung austretende Strömung weiter gerichtet beziehungsweise gelenkt, sodass die axiale Anströmung des Abgasreinigers einfach gewährleistbar ist. Durch die Strömungsleitelemente wird somit die durch die unterschiedlichen Durchströmungsbereiche bereits gebotene Entdrallung weiter optimiert. Furthermore, it is preferably provided that each flow guide opening is assigned at least one flow guide element downstream of the disk. The flow exiting through the respective flow guide opening is further directed or directed by the respective flow guide element, so that the axial flow towards the exhaust gas cleaner can be easily guaranteed. Through the Flow guide elements thus further optimize the de-twisting already provided by the different flow areas.
Besonders bevorzugt ist zumindest ein Strömungsleitelement als rohrförmiger Strömungskanal ausgebildet. Hierdurch ist eine besonders einfache Lenkung des Abgasstroms gewährleistet. At least one flow guide element is particularly preferably designed as a tubular flow channel. This ensures a particularly simple control of the exhaust gas flow.
Alternativ oder zusätzlich ist zumindest ein Strömungsleitelement als flaches oder gekrümmtes Strömungsleitblech, insbesondere als aus der Scheibe rausgebogene Strömungsleitzunge, ausgebildet. Auch hierdurch wird eine vorteilhafte Beeinflussung des Abgasstroms nach dem Durchdringen der jeweiligen Strömungsleitöffnung gewährleistet. Alternatively or in addition, at least one flow guide element is designed as a flat or curved flow guide plate, in particular as a flow guide tongue bent out of the disk. This also ensures that the exhaust gas flow is advantageously influenced after it has penetrated the respective flow guide opening.
Weiterhin ist bevorzugt vorgesehen, dass zumindest einer der Strömungsleitöffnungen mehrere gleiche oder unterschiedliche Strömungsleitelemente zugeordnet sind, um eine vorteilhafte Durchströmungslenkung zu gewährleisten. Furthermore, it is preferably provided that at least one of the flow guide openings is assigned a plurality of identical or different flow guide elements in order to ensure an advantageous flow control.
Im Folgenden wird die Erfindung anhand der Zeichnung näher erläutert. Dazu zeigen The invention is explained in more detail below with reference to the drawing. To show
Figur 1 ein Abgasnachbehandlungssystem in einer vereinfachtenFigure 1 shows an exhaust gas aftertreatment system in a simplified
Längsschnittdarstellung, Longitudinal section,
Figur 2 ein erstes Ausführungsbeispiel eines vorteilhaften Drallvernichters des Abgasnachbehandlungssystems, in einer vereinfachten perspektivischen Darstellung, FIG. 2 a first embodiment of an advantageous swirl destroyer of the exhaust gas aftertreatment system, in a simplified perspective illustration,
Figur 3 ein zweites Ausführungsbeispiel des Drallvernichters, Figure 3 shows a second embodiment of the swirl destroyer,
Figur 4 ein drittes Ausführungsbeispiel des Drallverzichters, Figure 4 shows a third embodiment of the twist waiver,
Figur 5 ein viertes Ausführungsbeispiel des Drallvernichters, Figure 5 shows a fourth embodiment of the swirl destroyer,
Figur 6 ein fünftes Ausführungsbeispiel des Drallvernichters, Figur 7 ein sechstes Ausführungsbeispiel des Drallvernichters, jeweils in einer vereinfachten Darstellung, FIG. 6 a fifth embodiment of the swirl destroyer, Figure 7 shows a sixth embodiment of the swirl destroyer, each in a simplified representation,
Figur 8 eine vorteilhafte erste Weiterbildung des Drallvernichters in einer perspektivischen Darstellung, FIG. 8 shows an advantageous first development of the swirl destroyer in a perspective illustration,
Figur 9 eine vorteilhafte zweite Weiterbildung des Drallvernichters in einer perspektivischen Darstellung und FIG. 9 shows an advantageous second development of the swirl destroyer in a perspective illustration and
Figur 10 ein vorteilhaftes drittes Ausführungsbeispiel des Drallvernichters in einer perspektivischen Darstellung. FIG. 10 an advantageous third exemplary embodiment of the swirl destroyer in a perspective illustration.
Figur 1 zeigt in einer vereinfachten Längsschnittdarstellung ein vorteilhaftes Abgasnachbehandlungssystem 1, das strömungstechnisch einer Brennkraftmaschine eines Kraftfahrzeugs, die hier nicht näher dargestellt sind, nachgeschaltet ist, sodass es von dem Abgas der Brennkraftmaschine durchströmbar ist. Das Abgasnachbehandlungssystem 1 weist einen Abgaskanal 2 auf, der eingangsseitig mit der Brennkraftmaschine verbunden ist, sodass das Abgas gemäß einem Pfeil 3 in den Abgaskanal 2 einströmt. In dem Abgaskanal 2 sind gemäß dem vorliegenden Ausführungsbeispiel einFigure 1 shows in a simplified longitudinal section an advantageous exhaust gas aftertreatment system 1, which is downstream of an internal combustion engine of a motor vehicle, which are not shown here, so that the exhaust gas from the internal combustion engine can flow through it. The exhaust gas aftertreatment system 1 has an exhaust gas duct 2, which is connected on the input side to the internal combustion engine, so that the exhaust gas flows into the exhaust gas duct 2 according to an arrow 3. According to the present exemplary embodiment, a
Dieseloxidationskatalysator 4 und stromabwärts des Dieseloxidationskatalysators ein Katalysator 5 als Abgasreiniger angeordnet. Der Katalysator 5 ist als SCR- Katalysator ausgebildet und dient zur selektiven katalytischen Reduktion (SCR) von schädlichen Stoffen, die in dem Abgas der Brennkraftmaschine enthalten sind. Um einen optimalen Betrieb des Katalysators 5 zu gewährleisten, wird das Abgas vor dem Durchströmen des Katalysators 5 mit einem flüssigen Abgasnachbehandlungsmittel vermischt, welches zusammen mit dem Abgas in dem Katalysator 5 die Schadstoffemissionen reduzierend zusammenwirkt. Diesel oxidation catalyst 4 and downstream of the diesel oxidation catalyst a catalyst 5 arranged as an exhaust gas cleaner. The catalytic converter 5 is designed as an SCR catalytic converter and is used for the selective catalytic reduction (SCR) of harmful substances contained in the exhaust gas of the internal combustion engine. To ensure optimal operation of the catalytic converter 5, the exhaust gas is mixed with a liquid exhaust gas aftertreatment agent before it flows through the catalytic converter 5, which, together with the exhaust gas in the catalytic converter 5, works to reduce pollutant emissions.
Zum Einbringen des Abgasnachbehandlungsmittels ist dem Abgaskanal 2 weiterhin ein Injektor 6 zugeordnet, mittels dessen das flüssige Abgasnachbehandlungsmittel dosiert in dem Abgaskanal 2 einspritzbar ist. Parallel oder stromabwärts des Injektors 6 ist strömungstechnisch eine Mischstrecke 7 in dem Abgaskanal 2 ausgebildet, in welcher eine vorteilhafte Vermischung des Abgasnachbehandlungsmittels mit dem Abgas erfolgt. In der Mischstrecke ist dazu zum Verbessern des Mischgrades ein Drallerzeuger 8 angeordnet, welcher den Abgasstrom in eine rotierende Strömung, also eine Strömung mit einem Drall, versetzt, wodurch das Abgasnachbehandlungsmittel besser mit dem Abgasstrom vermischt wird. In order to introduce the exhaust gas aftertreatment agent, an injector 6 is also assigned to the exhaust gas duct 2, by means of which the liquid exhaust gas aftertreatment agent can be injected into the exhaust gas duct 2 in a metered manner. In terms of flow, a mixing section 7 is formed in the exhaust gas duct 2 parallel or downstream of the injector 6, in which an advantageous Mixing of the exhaust gas aftertreatment agent with the exhaust gas takes place. To improve the degree of mixing, a swirl generator 8 is arranged in the mixing section, which turns the exhaust gas flow into a rotating flow, ie a flow with a swirl, whereby the exhaust gas aftertreatment agent is better mixed with the exhaust gas flow.
Stromabwärts des Drallerzeugers ist außerdem ein Drallvernichter 9 vorhanden, der dafür sorgt, dass die in Drall versetzte Strömung wieder gleichgerichtet wird beziehungsweise in eine axiale Strömung umgelenkt wird, sodass das vermischte Abgas mit dem Abgasnachbehandlungsmittel zumindest im Wesentlichen axial auf die Eintrittsfläche des Katalysators 5 trifft. Dadurch wird gewährleistet, dass mit dem Abgasstrom mitgeführte Tropfen oder (Schmutz- ) Partikel nicht durch den Drall des Abgasstroms auf der Katalysatoreintrittsfläche schräg auftreffen und/oder entlang rotieren beziehungsweise geschliffen werden, wodurch der Katalysator 5 beschädigt werden könnte. Stattdessen werden diese lediglich axial gegen die Eintrittsfläche gedrückt, und fügen aufgrund der in axialer Richtung deutlich höheren mechanischen Stabilität des Katalysatorsubstrats keinen weiteren Schaden hinzu. Downstream of the swirl generator there is also a swirl destroyer 9, which ensures that the swirled flow is rectified again or is deflected into an axial flow so that the mixed exhaust gas with the exhaust gas aftertreatment agent strikes the inlet surface of the catalytic converter 5 at least essentially axially. This ensures that droplets or (dirt) particles carried along with the exhaust gas flow do not hit the catalyst inlet surface at an angle due to the swirl of the exhaust gas flow and / or rotate along or be ground, which could damage the catalyst 5. Instead, they are only pressed axially against the entry surface and do not add any further damage due to the significantly higher mechanical stability of the catalyst substrate in the axial direction.
Der Drallvernichter 9 kann unterschiedlich ausgebildet sein. In jedem Fall weist der Drallvernichter 9 gemäß den vorliegenden Ausführungsbeispielen eine Scheibe 10 auf, deren Außendurchmesser zumindest im Wesentlichen dem Innendurchmesser des Abgaskanals 2 entspricht, sodass das Abgas nicht an der Scheibe 10 vorströmen kann. The swirl destroyer 9 can be designed differently. In any case, the swirl annihilator 9 according to the present exemplary embodiments has a disk 10, the outside diameter of which at least essentially corresponds to the inside diameter of the exhaust gas duct 2, so that the exhaust gas cannot flow in front of the disk 10.
In der Scheibe 10 sind eine Vielzahl von Strömungsleitöffnungen 11 ausgebildet, welche ein Passieren des Abgasstroms zu dem Katalysator 5 erlauben. A plurality of flow guide openings 11, which allow the exhaust gas flow to pass through to the catalytic converter 5, are formed in the disk 10.
Figur 2 zeigt ein erstes Ausführungsbeispiel, gemäß welchem die Scheibe 10 als perforierte Scheibe hergestellt ist, um die Vielzahl von Strömungsleitöffnungen 11 zu realisieren. Durch die vielen Strömungsleitöffnungen 11 wird der Abgasstrom zumindest im Wesentlichen gleich gerichtet und axial auf den Katalysator 5 gelenkt. Die Perforierung kann nachträglich an der Scheibe 10 erzeugt werden. Alternativ weist die Scheibe eine Gitterstruktur oder ein Gitter auf, deren beziehungsweise dessen Maschengröße den Durchströmungsquerschnitt der einzelnen Strömungsleitöffnung 11 definiert. FIG. 2 shows a first exemplary embodiment, according to which the disk 10 is produced as a perforated disk in order to realize the multiplicity of flow guide openings 11. The exhaust gas flow is directed at least substantially in the same direction through the many flow guide openings 11 and is directed axially onto the catalytic converter 5. The perforation can be produced on the pane 10 subsequently. Alternatively, the disk has a lattice structure or a lattice, the mesh size of which defines the flow cross section of the individual flow guide opening 11.
Figur 3 zeigt ein zweites Ausführungsbeispiel des Drallvernichters 9, das sich von dem vorhergehenden Ausführungsbeispiel dadurch unterscheidet, dass die Scheibe 10 aus einem offenporigen Schaum gefertigt ist, sodass der Abgasstrom durch die Poren der Scheibe 10 hindurch zu dem Katalysator 5 strömt. Die Scheibe weist dabei über die gesamte Fläche die gleiche Dicke auf, sodass an jeder Stelle der Scheibe 10 der gleiche Durchströmungsweg erzielt wird. FIG. 3 shows a second exemplary embodiment of the swirl destroyer 9, which differs from the previous exemplary embodiment in that the disk 10 is made from an open-pored foam, so that the exhaust gas stream flows through the pores of the disk 10 to the catalytic converter 5. The disk has the same thickness over the entire surface, so that the same flow path is achieved at every point on the disk 10.
Figur 4 zeigt ein drittes Ausführungsbeispiel, das der Scheibe 10, das sich von den vorhergehenden Ausführungsbeispielen dadurch unterscheidet, dass in der Scheibe 10 Strömungsleitöffnungen 11 mit unterschiedlichen Durchströmungsquerschnitten ausgebildet sind. Dabei sind die Strömungsleitöffnungen 11 derart angeordnet, dass ein erster Durchströmungsbereich 12 mit einer ersten Gruppe von Strömungsleitöffnungen 11 gebildet ist und ein zweiter Durchströmungsbereich 13 mit einer zweiten Gruppe von Durchströmungsöffnungen. Der Durchströmungsöffnungsbereich 12 ist in Figur 4 durch eine gestrichelte Linie eingerahmt. Die Strömungsleitöffnungen 11 in dem Durchströmungsbereich 12 weisen jeweils einen kleineren Durchströmungsquerschnitt als die Strömungsleitöffnungen 11 in dem übrigen Bereich beziehungsweise dem Durchströmungsbereich 13 der Scheibe 10 auf. Dadurch ergibt sich, dass an der Scheibe 10 im Durchströmungsbereich 12 ein höherer Strömungswiderstand entsteht, der dem Abgasstrom entgegenwirkt, als in dem zweiten Durchströmungsbereich 13.FIG. 4 shows a third exemplary embodiment, that of the disk 10, which differs from the preceding exemplary embodiments in that flow guide openings 11 with different flow cross-sections are formed in the disk 10. The flow guide openings 11 are arranged in such a way that a first flow area 12 is formed with a first group of flow guide openings 11 and a second flow area 13 is formed with a second group of flow openings. The throughflow opening area 12 is framed by a dashed line in FIG. The flow guide openings 11 in the flow area 12 each have a smaller flow cross section than the flow guide openings 11 in the remaining area or the flow area 13 of the disk 10. This results in a higher flow resistance, which counteracts the exhaust gas flow, arises on the disk 10 in the flow area 12 than in the second flow area 13.
Durch diese ungleichmäßige Ausbildung der Scheibe 10 beziehungsweise Drallvernichters 9 wird erreicht, dass gezielt Bereiche des Abgasstroms stärker ausgebremst werden als andere, um eine Gleichrichtung des Abgasstroms in axialer Richtung zu gewährleisten. Dabei ist die Anordnung und Ausbildung des ersten Durchströmungsbereichs 12 in Abhängigkeit von der Position des Auslass des Drallerzeugers 8, des Abstands der Scheibe 10 zu dem Drallerzeuger 8 sowie zu dem Katalysator 5 und bevorzugt auch in Abhängigkeit von bekannten Betriebsbedingungen der Brennkraftmaschine gewählt, um einen bestmöglichen Effekt zur Gleichrichtung der Strömung in axialer Richtung zu gewährleisten. This uneven design of the disc 10 or swirl destroyer 9 ensures that specific areas of the exhaust gas flow are slowed down more strongly than others in order to ensure that the exhaust gas flow is rectified in the axial direction. The arrangement and design of the first flow area 12 is dependent on the position of the outlet of the swirl generator 8, the distance between the disk 10 and the swirl generator 8 and the catalytic converter 5, and preferably also depends on known ones Operating conditions of the internal combustion engine selected to ensure the best possible effect for rectifying the flow in the axial direction.
Figur 5 zeigt ein viertes Ausführungsbeispiel des Drallvernichters 9, das sich von dem vorhergehenden Ausführungsbeispiel dadurch unterscheidet, dass die Strömungsleitöffnungen 11 keinen kreisförmigen Durchströmungsquerschnitt aufweisen, sondern einen mehreckförmigen. Dabei sind gemäß dem vorliegenden Ausführungsbeispiel die Durchströmungsöffnungen 11 in dem zweiten Durchströmungsbereich 13 dreieckförmig ausgebildet, während die Durchströmungsöffnungen 11 in dem ersten Durchströmungsbereich 12 rechteckförmig oder streifenförmig ausgebildet sind. Auch hierdurch wird das Strömungsverhalten des Abgasstroms in Richtung des Katalysators 5 vorteilhaft beeinflusst. FIG. 5 shows a fourth exemplary embodiment of the swirl annihilator 9, which differs from the previous exemplary embodiment in that the flow guide openings 11 do not have a circular flow cross section, but rather a polygonal one. According to the present exemplary embodiment, the throughflow openings 11 in the second throughflow region 13 are triangular, while the throughflow openings 11 in the first throughflow region 12 are rectangular or strip-shaped. This also has an advantageous effect on the flow behavior of the exhaust gas flow in the direction of the catalytic converter 5.
Figur 6 zeigt ein fünftes Ausführungsbeispiel des Drallvernichters 9, bei welchem die Scheibe 10 eine ein Gitter beziehungsweise eine Gitterstruktur aufweist, um die Durchströmungsöffnungen 11 zu bilden. Dabei weist die Scheibe 10 zwei unterschiedliche Gitterstrukturen auf, die die Durchströmungsbereiche 12 und 13 bilden, wobei die Gitterstruktur und der Durchströmungsbereich 12 kleinere Maschengrößen aufweist, als die Gitterstruktur im Durchströmungsbereich 13, um den oben beschriebenen Effekt zu erreichen. Optional weist die Scheibe 10 lediglich die Gitterstruktur gemäß dem Durchströmungsbereich 13 auf, und stromabwärts oder stromaufwärts diese Gitterstruktur eine zweite Gitterstruktur, welche bereichsweise im Durchströmungsbereich 12 die Scheibe 10 überdeckt, und dadurch verkleinerte Durchströmungsquerschnitte realisiert, wobei die zweite Gitterstruktur bevorzugt eine kleinere Maschengröße aufweist. FIG. 6 shows a fifth exemplary embodiment of the swirl destroyer 9, in which the disc 10 has a grid or a grid structure in order to form the throughflow openings 11. The disk 10 has two different lattice structures that form the flow-through areas 12 and 13, the lattice structure and the flow-through area 12 having smaller mesh sizes than the lattice structure in the flow-through area 13 in order to achieve the effect described above. Optionally, the disk 10 only has the lattice structure according to the flow-through area 13, and downstream or upstream this lattice structure has a second lattice structure, which covers the disk 10 in areas in the flow-through area 12, and thereby realizes reduced flow cross-sections, the second lattice structure preferably having a smaller mesh size.
Figur 7 zeigt ein sechstes Ausführungsbeispiel des Drallvernichters 9, bei welchem die Scheibe 10 wie im Ausführungsbeispiel von Figur 3 aus einem porösen beziehungsweise offenporigen Schaum gefertigt ist, der jedoch unterschiedliche Durchströmungswiderstände bietet. Dazu ist in dem Durchströmungsbereich 12 vorgesehen, dass die Scheibe 10 beziehungsweise der offenporige Schaum eine im Vergleich zu dem Durchströmungsbereich 13 erhöhte Stärke beziehungsweise Tiefe aufweist, sodass in diesem Bereich ein längerer Strömungsweg für den Abgasstrom gebildet ist, wodurch in den Durchströmungsbereich 12 ein erhöhter Strömungswiderstand entsteht. FIG. 7 shows a sixth exemplary embodiment of the swirl destroyer 9, in which the disk 10, as in the exemplary embodiment of FIG. 3, is made of a porous or open-pored foam, which, however, offers different flow resistances. For this purpose, it is provided in the flow-through region 12 that the disk 10 or the open-pored foam has an increased thickness or depth compared to the flow-through region 13, so that a longer flow path is formed for the exhaust gas flow, whereby an increased flow resistance arises in the flow area 12.
Figur 8 zeigt eine erste vorteilhafte Weiterbildung des Drallvernichters 9, gemäß welcher der jeweiligen Strömungsleitöffnung 11 stromabwärts an der Scheibe ein Strömungskanal 14 als Luftleitelement 15 zugeordnet ist, durch welchen der Abgasstrom gelenkt wird. Der Strömungskanal ist insbesondere senkrecht zur Ebene der Scheibe 10 ausgerichtet, sodass der Abgasstrom axial zu dem Katalysator 5 geführt ist. Insbesondere ist der Abgaskanal senkrecht zur Eintrittsfläche des Katalysators 5 ausgerichtet, unabhängig von der Ausrichtung der Scheibe 10 selbst. FIG. 8 shows a first advantageous further development of the swirl destroyer 9, according to which the respective flow guide opening 11 is assigned a flow channel 14 as an air guide element 15 downstream on the disk, through which the exhaust gas flow is directed. The flow channel is in particular aligned perpendicular to the plane of the disk 10, so that the exhaust gas flow is guided axially to the catalytic converter 5. In particular, the exhaust gas duct is oriented perpendicular to the inlet surface of the catalytic converter 5, regardless of the orientation of the disk 10 itself.
Gemäß dem Ausführungsbeispiel von Figur 9 ist der jeweiligen Strömungsleitöffnung 11 mehrere Luftleitelemente 15, hier in Form von dreieckförmigen Leitblechen 16 zugeordnet, die die Strömungsleitöffnung 11 randseitig umgeben und dadurch den Abgasstrom axial zu der Eintrittsfläche des Katalysators 5 leiten. According to the exemplary embodiment of FIG. 9, the respective flow guide opening 11 is assigned a plurality of air guide elements 15, here in the form of triangular guide plates 16, which surround the flow guide opening 11 at the edge and thereby guide the exhaust gas flow axially to the inlet surface of the catalytic converter 5.
Gemäß dem Ausführungsbeispiel von Figur 10, das eine dritte Weiterbildung zeigt, ist der jeweiligen Durchströmungsöffnung 11, die in diesem Fall rechteckförmig ausgebildet ist, nur ein Strömungsleitelement 15 in Form einer aus der Scheibe 10 herausgebogenen Strömungsleitzunge 17 zugeordnet, welche derart ausgerichtet ist, dass der Abgasstrom axial zu dem Katalysator 5 geführt wird. According to the exemplary embodiment of FIG. 10, which shows a third development, the respective throughflow opening 11, which in this case is rectangular, is assigned only one flow guide element 15 in the form of a flow guide tongue 17 bent out of disk 10, which is oriented such that the Exhaust gas flow is guided axially to the catalyst 5.
Der Drallvernichter 9 ist bevorzugt aus einem Flachmaterial, beispielsweise einem flachen oder geraden Blech gefertigt, oder aus einem gebogenen Flachmaterial, beispielsweise aus einem bombierten Blech zur Verbesserung der thermo-mechanischen Haltbarkeit. Auch kann der Drallvernichter 9 aus einer dreidimensionalen Struktur, wie beispielsweise einem Rechteckgitter,The swirl annihilator 9 is preferably made of a flat material, for example a flat or straight sheet metal, or a curved flat material, for example a cambered sheet metal to improve the thermo-mechanical durability. The swirl shredder 9 can also consist of a three-dimensional structure, such as a rectangular grid,
Rohrbündel, Wabenstruktur oder einem offenporigen Schaum, wie obenstehend bereits beschrieben, gefertigt sein. Insbesondere ist der Drallvernichter 9 aus metallischen oder keramischen Werkstoffen oder aus Kompositwerkstoffen gefertigt. Das Verhältnis der Querschnittsfläche aller Strömungsleitöffnungen 11 zu der Gesamtfläche der Scheibe 10 liegt bevorzugt zwischen 0,1 bis 0,55, besonders bevorzugt zwischen 0,25 bis 0,3. Die Strömungsleitöffnungen 11 können dabei gleichmäßig oder ungleichmäßig verteilt angeordnet sein, je nachdem, welcher Effekt erzielt werden soll. Tube bundle, honeycomb structure or an open-cell foam, as already described above, be manufactured. In particular, the swirl destroyer 9 is made from metallic or ceramic materials or from composite materials. The ratio of the cross-sectional area of all flow guide openings 11 to the total area of the disk 10 is preferably between 0.1 and 0.55, particularly preferably between 0.25 and 0.3. The flow guide openings 11 can be arranged distributed uniformly or unevenly, depending on which effect is to be achieved.
Weiterhin ist die Scheibe 10 beziehungsweise der Drallvernichter 9 bevorzugt derart in dem Abgaskanal 2 positioniert, dass es einen Abstand, insbesondere axialen Abstand, S1 von dem Auslass des Drallerzeugers 8 aufweist, der in einem Bereich von 1/10 x D bis 1/3 x D, insbesondere bei 1/6 x D liegt, wobei D der Innendurchmesser des Abgaskanals 2 ist. Der Abstand zwischen dem Drallvernichter 9 und der Eintrittsfläche des Katalysators 5 liegt vorzugsweise in einem Bereich von 1/20 x D bis 1/4 x D, insbesondere bei etwa 1/10 x D. Während vorliegend stromabwärts des Drallvernichters 9 ein Katalysator 5 folgt, kann gemäß einem weiteren Ausführungsbeispiel anstelle des Katalysators 5 auch ein Filter oder ein anderer Schadstoffe in dem Abgas reduzierender reinigender Abgasreiniger, wie zum Beispiel ein Diesel-Partikel- Filter oder ein SCR beschichtetes Filter, vorhanden sein. Furthermore, the disk 10 or the swirl annihilator 9 is preferably positioned in the exhaust gas duct 2 in such a way that it has a distance, in particular an axial distance, S1 from the outlet of the swirl generator 8, which is in a range from 1/10 x D to 1/3 x D, in particular 1/6 x D, where D is the inner diameter of the exhaust gas duct 2. The distance between the swirl destroyer 9 and the inlet surface of the catalytic converter 5 is preferably in a range from 1/20 x D to 1/4 x D, in particular about 1/10 x D. According to a further exemplary embodiment, instead of the catalytic converter 5, there may also be a filter or some other pollutant-reducing exhaust gas cleaner, such as a diesel particle filter or an SCR-coated filter.

Claims

Ansprüche Expectations
1. Abgasnachbehandlungssystem (1) für eine Brennkraftmaschine eines Kraftfahrzeugs, mit einem Abgaskanal (2), der von einem Abgas der Brennkraftmaschine durchströmbar ist, wobei in dem Abgaskanal (2) ein Abgasreiniger, insbesondere Katalysator (5), angeordnet ist, wobei stromaufwärts des Abgasreinigers ein Injektor (6) dem Abgaskanal (2) zum Einspritzen eines Abgasnachbehandlungsmittels in den Abgaskanal (2) zugeordnet ist, und wobei strömungstechnisch zwischen dem Injektor (6) und dem Abgasreiniger eine Mischeinrichtung mit einem Drallerzeuger (8) zum Vermischen des eingespritzten Abgasnachbehandlungsmittels mit dem Abgas stromaufwärts des Abgasreinigers angeordnet ist, dadurch gekennzeichnet, dass zwischen dem Drallerzeuger (8) und dem Abgasreiniger ein Drallvernichter1. Exhaust gas aftertreatment system (1) for an internal combustion engine of a motor vehicle, with an exhaust gas duct (2) through which an exhaust gas from the internal combustion engine can flow, an exhaust gas cleaner, in particular a catalytic converter (5), being arranged in the exhaust gas duct (2), with the upstream of the Exhaust gas cleaner, an injector (6) is assigned to the exhaust gas duct (2) for injecting an exhaust gas aftertreatment agent into the exhaust gas duct (2), and a mixing device with a swirl generator (8) for mixing the injected exhaust gas aftertreatment agent with fluidic between the injector (6) and the exhaust gas cleaner the exhaust gas is arranged upstream of the exhaust gas cleaner, characterized in that a swirl destroyer between the swirl generator (8) and the exhaust gas cleaner
(9) zum Einstellen einer axialen Anströmung des Abgasreinigers angeordnet ist. (9) is arranged for setting an axial flow against the exhaust gas cleaner.
2. Abgasnachbehandlungssystem nach Anspruch 1, dadurch gekennzeichnet, dass der Drallvernichter (9) eine in dem Abgaskanal (2) zumindest im Wesentlichen senkrecht zur Längserstreckung des Abgaskanals (2) ausgerichtete Scheibe (10) aufweist, die sich über den gesamten Durchströmungsquerschnitt des Abgaskanals (2) erstreckt und wenigstens eine Strömungsleitöffnung (11) aufweist. 2. Exhaust gas aftertreatment system according to claim 1, characterized in that the swirl destroyer (9) has a disc (10) which is aligned in the exhaust gas duct (2) at least substantially perpendicular to the longitudinal extent of the exhaust gas duct (2) and extends over the entire flow cross-section of the exhaust gas duct ( 2) and has at least one flow guide opening (11).
3. Abgasnachbehandlungssystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass in der Scheibe (10) eine Vielzahl von Strömungsleitöffnungen (11) ausgebildet sind. 3. Exhaust aftertreatment system according to one of the preceding claims, characterized in that a plurality of flow guide openings (11) are formed in the disc (10).
4. Abgasnachbehandlungssystem nach Anspruch 3, dadurch gekennzeichnet, dass die Strömungsleitöffnungen (11) derart in der Scheibe4. exhaust gas aftertreatment system according to claim 3, characterized in that the flow guide openings (11) in such a way in the disc
(10) ausgebildet sind, dass sie einen ersten Durchströmungsbereich (12) mit einem ersten Strömungswiderstand und zumindest einen zweiten Durchströmungsbereich (13) mit einem zweiten Strömungswiderstand bilden, wobei der zweite Strömungswiderstand kleiner ist als der erste Strömungswiderstand. (10) are designed that they form a first flow area (12) with a first flow resistance and at least one second flow area (13) with a second flow resistance, wherein the second flow resistance is smaller than the first flow resistance.
5. Abgasnachbehandlungssystem nach einem der Ansprüche 3 und 4, dadurch gekennzeichnet, dass zumindest einige der Strömungsleitöffnungen (11) einen kreisförmigen oder ovalen Querschnitt aufweisen. 5. Exhaust gas aftertreatment system according to one of claims 3 and 4, characterized in that at least some of the flow guide openings (11) have a circular or oval cross section.
6. Abgasnachbehandlungssystem nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass zumindest einige der Strömungsleitöffnungen (11) einen mehreckförmigen, insbesondere rechteckförmigen, dreieckförmigen oder quadratischen Durchströmungsquerschnitt aufweisen. 6. Exhaust aftertreatment system according to one of claims 3 to 5, characterized in that at least some of the flow guide openings (11) have a polygonal, in particular rectangular, triangular or square flow cross-section.
7. Abgasnachbehandlungssystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Scheibe (10) zumindest ein eine Vielzahl von Strömungsleitöffnungen (11) bildendes Gitter aufweist. 7. Exhaust gas aftertreatment system according to one of the preceding claims, characterized in that the disc (10) has at least one grating forming a plurality of flow guide openings (11).
8. Abgasnachbehandlungssystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Scheibe (10) ein erstes Gitter aufweist, mit einer ersten Maschengröße, und ein zweites Gitter mit einer zweiten Maschengröße, die größer als die erste Maschengröße ist. 8. Exhaust aftertreatment system according to one of the preceding claims, characterized in that the disc (10) has a first grid with a first mesh size, and a second grid with a second mesh size which is larger than the first mesh size.
9. Abgasnachbehandlungssystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Gitter in Strömungsrichtung gesehen nebeneinander angeordnet sind. 9. Exhaust aftertreatment system according to one of the preceding claims, characterized in that the grids are arranged next to one another as seen in the flow direction.
10. Abgasnachbehandlungssystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Gitter in Strömungsrichtung zumindest bereichsweise hintereinanderliegend angeordnet sind. 10. Exhaust aftertreatment system according to one of the preceding claims, characterized in that the grids are arranged one behind the other at least in some areas in the flow direction.
11. Abgasnachbehandlungssystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass jeder Strömungsleitöffnung (11) zumindest ein Strömungsleitelement (15) stromabwärts der Scheibe (10) zugeordnet ist. 11. Exhaust aftertreatment system according to one of the preceding claims, characterized in that each flow guide opening (11) is assigned at least one flow guide element (15) downstream of the disk (10).
12. Abgasnachbehandlungssystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zumindest ein Strömungsleitelement (15) als rohrförmiger Strömungskanal (14) ausgebildet ist. 12. Exhaust aftertreatment system according to one of the preceding claims, characterized in that at least one flow guide element (15) is designed as a tubular flow channel (14).
13. Abgasnachbehandlungssystem nach einem der vorhergehenden13. Exhaust aftertreatment system according to one of the preceding
Ansprüche, dadurch gekennzeichnet, dass zumindest ein Strömungsleitelement (14) als flaches oder gekrümmtes Strömungsleitblech (16), insbesondere als aus der Scheibe (10) herausgebogene Strömungsleitzunge (17) ausgebildet ist. Claims, characterized in that at least one flow guide element (14) is designed as a flat or curved flow guide plate (16), in particular as a flow guide tongue (17) bent out of the disk (10).
14. Abgasnachbehandlungssystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zumindest einer Strömungsleitöffnung (11) mehrere gleiche oder unterschiedliche Strömungsleitelemente (15) zugeordnet sind. 14. Exhaust aftertreatment system according to one of the preceding claims, characterized in that at least one flow guide opening (11) is assigned a plurality of identical or different flow guide elements (15).
PCT/EP2020/066074 2019-08-08 2020-06-10 Exhaust gas aftertreatment system for an internal combustion engine of a motor vehicle WO2021023418A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11549422B1 (en) 2021-12-06 2023-01-10 Tenneco Automotive Operating Company Inc. Exhaust system for a combustion engine including a flow distributor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120151902A1 (en) * 2010-12-16 2012-06-21 Caterpillar Inc. Biased reductant mixer
DE102011077156A1 (en) 2011-06-07 2012-12-13 Bosch Emission Systems Gmbh & Co. Kg Exhaust system for internal combustion engine of motor vehicle, has mixing channel with helical/helically configured spiral region that is inclined at specific angle with respect to center axis
EP2865861A1 (en) * 2013-10-22 2015-04-29 Eberspächer Exhaust Technology GmbH & Co. KG Catalyst assembly with injection section
WO2016118720A1 (en) * 2015-01-22 2016-07-28 Tenneco Automotive Operating Company Inc. Exhaust aftertreatment system having mixer assembly
DE102016211703A1 (en) 2016-06-29 2018-01-04 Robert Bosch Gmbh Mixer device for an exhaust aftertreatment system of a motor vehicle, exhaust aftertreatment system and motor vehicle
WO2018226626A1 (en) * 2017-06-06 2018-12-13 Cummins Emission Solutions Inc. Systems and methods for mixing exhaust gases and reductant in an aftertreatment system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120151902A1 (en) * 2010-12-16 2012-06-21 Caterpillar Inc. Biased reductant mixer
DE102011077156A1 (en) 2011-06-07 2012-12-13 Bosch Emission Systems Gmbh & Co. Kg Exhaust system for internal combustion engine of motor vehicle, has mixing channel with helical/helically configured spiral region that is inclined at specific angle with respect to center axis
EP2865861A1 (en) * 2013-10-22 2015-04-29 Eberspächer Exhaust Technology GmbH & Co. KG Catalyst assembly with injection section
WO2016118720A1 (en) * 2015-01-22 2016-07-28 Tenneco Automotive Operating Company Inc. Exhaust aftertreatment system having mixer assembly
DE102016211703A1 (en) 2016-06-29 2018-01-04 Robert Bosch Gmbh Mixer device for an exhaust aftertreatment system of a motor vehicle, exhaust aftertreatment system and motor vehicle
WO2018226626A1 (en) * 2017-06-06 2018-12-13 Cummins Emission Solutions Inc. Systems and methods for mixing exhaust gases and reductant in an aftertreatment system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11549422B1 (en) 2021-12-06 2023-01-10 Tenneco Automotive Operating Company Inc. Exhaust system for a combustion engine including a flow distributor

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