US20110173956A1 - Particle trap for an exhaust gas recirculation line and automobile having a particle trap - Google Patents

Particle trap for an exhaust gas recirculation line and automobile having a particle trap Download PDF

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Publication number
US20110173956A1
US20110173956A1 US13/026,829 US201113026829A US2011173956A1 US 20110173956 A1 US20110173956 A1 US 20110173956A1 US 201113026829 A US201113026829 A US 201113026829A US 2011173956 A1 US2011173956 A1 US 2011173956A1
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US
United States
Prior art keywords
exhaust gas
particle trap
hollow body
gas recirculation
line
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US13/026,829
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English (en)
Inventor
Hubertus Kotthoff
Joachim Sittig
Hans-Peter Casper
Uwe Siepmann
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Vitesco Technologies Lohmar Verwaltungs GmbH
Original Assignee
Emitec Gesellschaft fuer Emissionstechnologie mbH
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.)
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Publication of US20110173956A1 publication Critical patent/US20110173956A1/en
Assigned to EMITEC GESELLSCHAFT FUER EMISSIONSTECHNOLOGIE MBH reassignment EMITEC GESELLSCHAFT FUER EMISSIONSTECHNOLOGIE MBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CASPER, HANS-PETER, KOTTHOFF, HUBERTUS, SIEPMANN, UWE, SITTIG, JOACHIM
Abandoned legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D39/00Filtering material for liquid or gaseous fluids
    • B01D39/14Other self-supporting filtering material ; Other filtering material
    • B01D39/20Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • B01D46/525Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material which comprises flutes
    • B01D46/526Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material which comprises flutes in stacked arrangement
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D39/00Filtering material for liquid or gaseous fluids
    • B01D39/10Filter screens essentially made of metal
    • B01D39/12Filter screens essentially made of metal of wire gauze; of knitted wire; of expanded metal
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0002Casings; Housings; Frame constructions
    • B01D46/0005Mounting of filtering elements within casings, housings or frames
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0002Casings; Housings; Frame constructions
    • B01D46/0017Filter elements installed in a branch of a pipe, e.g. with an y-shaped tubular housing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2411Filter cartridges
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/56Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
    • B01D46/62Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/15Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2275/00Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/20Shape of filtering material
    • B01D2275/205Rectangular shape
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2275/00Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/20Shape of filtering material
    • B01D2275/206Special forms, e.g. adapted to a certain housing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2275/00Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/20Shape of filtering material
    • B01D2275/207Triangular shape
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2275/00Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/20Shape of filtering material
    • B01D2275/208Oval shape

Definitions

  • the invention relates to a particle trap disposed in a junction region between an exhaust gas line and an exhaust gas recirculation line. Such particle traps are used, in particular, in exhaust systems of (mobile) internal combustion engines.
  • the invention also relates to an automobile having a particle trap.
  • exhaust gasses of a diesel engine which have a relatively large amount of non-combusted carbon particles, frequently also referred to as soot particles, represents a particular demand.
  • An important objective of exhaust gas purification is to remove those carbon particles or soot particles from the exhaust gas of a diesel engine. Soot particles can also have an adverse effect during the recirculation of exhaust gas into the internal combustion engine.
  • the objective of a particle trap between the exhaust gas line and the exhaust gas recirculation line is therefore to prevent the recirculation of carbon particles or soot particles and, if appropriate, also to hold back other solid bodies.
  • the exhaust gas recirculation also influences the production and/or conversion of nitrogen oxides.
  • soot burn-off filters are also used to a certain extent in exhaust gas lines in order to remove soot particles from the exhaust gas.
  • Those soot burn-off filters are frequently fabricated from ceramic materials.
  • Porous, sintered ceramic filters (“wall flow filters”) are frequently used. Ceramic filters are, in any case, already distinguished by a high degree of brittleness. That behavior is further reinforced by the different temperatures when used by an exhaust gas line. Small particles can easily become detached from a ceramic filter or a mounting mat surrounding the ceramic filter. If such solid bodies are fed back into the combustion chamber of an internal combustion engine through an exhaust gas recirculation line, they can cause considerable damage there. The ceramic particles behave there as abrasive bodies and can bring about considerable wear on engine components.
  • a filter device which is disposed in the exhaust gas recirculation line is capable of removing particles from the recirculated exhaust gas.
  • a disadvantage of such a filter device is that it can become blocked by the particles. Once particles have been trapped by such a filter device, they continue to be held in the filter device by the continually flowing exhaust gas. As a result, the properties of the filter device change considerably.
  • the permeability of the filter is reduced with the effect that, for example, an undesired drop in pressure can occur across the filter. Drops in pressure and permeability in turn influence the quantity of recirculated exhaust gas. Therefore, regular cleaning of the filter device is necessary in order to maintain filter properties which are constant over time.
  • an especially cost-effective device for trapping particles upstream of an exhaust gas recirculation line is to be presented.
  • a particle trap disposed between an exhaust gas line and an exhaust gas recirculation line.
  • the particle trap comprises at least one partially permeable hollow body separating the exhaust gas recirculation line from the exhaust gas line.
  • the at least one partially permeable hollow body includes a wall defining a primary shape having an inner space with at least one open side.
  • the wall is gas-permeable and has a secondary structure with elevations and depressions.
  • Such exhaust gas systems are usually embodied in such a way that they have a line section in which the exhaust gas recirculation line is connected by a flange or flanges to the exhaust gas line or is connected through the use of a welding seam there.
  • this device can, for example, also include a type of T element of the exhaust system.
  • the at least partially permeable hollow body is generally embodied in such a way that it has a wall through which exhaust gas can flow (preferably completely).
  • This wall represents in this case in particular the fluidic boundary between the exhaust gas flow of the exhaust gas line and the exhaust gas flow which is recirculated by the exhaust gas recirculation line.
  • the wall of the partially permeable hollow body accordingly includes a permeable material which gives the hollow body its permeability.
  • the hollow body is quite particularly preferably configured in the manner of a radial sieve. It is also advantageous in this case if the wall of the hollow body is dimensionally stable, that is to say maintains its primary shape itself.
  • the wall is embodied with at least one entangled configuration, a fabric or mesh configuration or a sintered material, in particular metallic, temperature-resistant materials.
  • a nonwoven with wire filaments which are woven (asymmetrically), with the wire filaments being sintered to one another, is very particularly preferred.
  • the “primary shape” of the permeable hollow body is meant herein to refer to a geometric shape which substantially determines the shape of the hollow body.
  • the primary shape therefore forms the shape of the hollow body, with the result that in particular at least 80% or even 95% of the volume of the hollow body is included in this primary shape.
  • Pipe-shaped primary shapes are preferably used.
  • a pipe-shaped hollow body with a circular cross section is preferred but, if appropriate, oval, triangular, square, rectangular or polygonal cross sections are also possible as a primary shape of the at least one partially permeable hollow body.
  • the second side (which is fluidically opposite) can also be open, but it is also possible for that side to be closed off (fluidically), with the result that all of the exhaust gas entering the inner space then generally leaves the inner space again through the wall.
  • the hollow body also has a smaller secondary structure which is superimposed on the primary shape.
  • a “secondary structure” means in this case in particular a (periodic and/or regular) deviation from the cross section of the primary shape in the transverse direction with respect to the profile of the wall (circumferential direction), for example radially outward, which is also referred to as elevated portions, and/or radially inward and is also referred to as depressions. It is possible, for example, to provide corrugated, folded, bent and/or meandering deviations.
  • Elevated portions and/or depressions particularly preferably run over the entire axial extent of the primary shape of the partially permeable hollow body or of the wall, with the result that (linearly) elongate elevated portions and/or depressions are formed in the axial direction.
  • the secondary structure of the at least one partially permeable hollow body increases the strength of the particle trap.
  • the particle trap proposed herein with a secondary structure can cope with significantly greater drops in pressure while having a significantly smaller thickness. Furthermore, the surface for the deposition of the particles is enlarged.
  • microflows can implement (for example as a function of the flow of the exhaust gas (speed, mass throughput rate, etc.)) a predetermined quantity of the exhaust gas mass flow which is to be recirculated and/or a predetermined embedding characteristic of the particles and/or a predetermined purification characteristic for the particle trap (or the wall).
  • the exhaust gas line has a first central cross section and a first enlarged cross section which is widened as compared to the first central cross section.
  • the at least one partially permeable hollow body is disposed in this case in the first enlarged cross section. It is thus possible to ensure, in particular, that there is not a direct flow against the hollow body or its wall but rather the hollow body or its wall is positioned, for example, in a flow shadow which is formed by the first enlarged cross section.
  • the at least one partially permeable hollow body is attached in the region of the first enlarged cross section to the exhaust gas line through the use of push-in ring connections. It is particularly advantageous if push-in ring connections, into which the (open) sides of the permeable hollow body can engage directly in a form-locking fashion, are provided in the exhaust gas line or in the widened portion of the exhaust gas line, in the region of the particle traps.
  • a form-locking connection is one which connects two elements together due to the shape of the elements themselves, as opposed to a force-locking connection, which locks the elements together by force external to the elements.
  • Such push-in connections can, for example, be provided directly during the manufacture of a branching off component by punching or deep drawing. Fluidic advantages for the main exhaust gas stream (smaller drop in pressure) and less contamination are also achieved by the configuration of the push-in ring attachments in the flow shadow, so that changing the hollow body is unproblematical.
  • the exhaust gas recirculation line in the same way as the exhaust gas line, can likewise have a second central cross section and a second enlarged cross section, wherein the at least one partially permeable hollow body is disposed in the second enlarged cross section.
  • a combined configuration in which a permeable hollow body is disposed in the first enlarged cross section of the exhaust gas line and (respectively) in the second enlarged cross section of the exhaust gas recirculation line is basically possible, wherein then, if appropriate, different refinements of the hollow bodies should be present (for example in terms of permeability, stability, etc.).
  • an open side of the at least one partially permeable hollow body is closed off by a cap.
  • a cap in particular a metal cap
  • the cap it is also possible for the cap (in particular a metal cap) to have a selective bypass, that is to say, for example, a small hole. It is then possible, under certain circumstances, for the cap also to be attached on both sides, wherein one cap is provided with a bypass function and one without a bypass function.
  • the stability of the primary shape can also be set with the cap.
  • the elevated portions and depressions of the secondary structure run parallel to a first main direction of the exhaust gas line or to a second main direction of the exhaust gas recirculation line.
  • the exhaust gas stream can flow (as a function of the load) through the depressions in the secondary structure without a large flow resistance and therefore clean the latter of deposited carbon particles or soot particles or ceramic particles.
  • the wall of the at least one partially permeable hollow body is preferably formed from at least one layer with elevated portions and depressions, wherein the at least one layer forms a region which overlaps with itself and in which the elevated portions and the depressions engage in one another in a form-locking fashion.
  • a layer is understood in this case to be, for example, a planar filter material or sieve material, wherein basically also a plurality of materials (and, if appropriate, different materials) can be provided for embodying the wall. This layer can be positioned to form a primary shape with two open sides, with the result that it forms a region which overlaps with itself.
  • the elevated portions and depressions of the layer can thus engage in one another in a form-locking fashion if the layer is rolled up so as to form an inner space.
  • a stable, tube-shaped hollow body is formed without materially joined connections having to be formed in the overlapping region.
  • the stability is provided in particular if such a hollow body is secured in a materially joined fashion at the edges of its open sides to an exhaust gas line or an exhaust gas recirculation line.
  • the stiffness of such a hollow body can additionally be increased by virtue of the fact that at least one support layer is provided which has a shape that corresponds to the secondary structure of the at least one hollow body.
  • at least one support layer is provided which has a shape that corresponds to the secondary structure of the at least one hollow body.
  • the hollow body and the supporting layer which at least partially surrounds it can then engage in one another in a form-locking fashion.
  • the at least one supporting layer can support the hollow body from the inside and/or outside, and if appropriate integration into a plurality of layers of filter material and/or sieve material is also possible. Whether support from the inside or outside is preferred depends on the direction of action of a possible drop in pressure.
  • the supporting layer should be provided in such a way that the drop in pressure presses the layer against the supporting layer.
  • a wall with meshes or openings of up to 0.3 mm is preferably used.
  • the width of the meshes is preferably in the range of less than 0.2 mm and quite particularly preferably in the range from 0.05 mm to 0.15 mm.
  • an automobile comprising an internal combustion engine, an exhaust system having at least one particle trap according to the invention, and an exhaust gas recirculation line defining a first flow direction leading to the internal combustion engine.
  • the particle trap is disposed in such a way that the first flow direction in the exhaust gas recirculation line directly downstream of the particle trap runs counter to the force of gravity.
  • the exhaust gas recirculation line or the junction region with the hollow body is subjected to the force of gravity in such a way that particles or the like fall out again from there automatically, specifically in particular back into the exhaust gas line again and from there further into the exhaust gas purification components of the exhaust gas line which are disposed downstream.
  • the hollow body itself to have a center axis which is oriented substantially parallel to the force of gravity. In this way, the force of gravity can additionally counteract the deposition of soot particles and/or ceramic particles on the trap.
  • an automobile comprising an internal combustion engine, an exhaust system having at least one particle trap according to the invention and at least one ceramic filter, and
  • an exhaust gas line defining a second flow direction leading away from the internal combustion engine.
  • the at least one ceramic filter is disposed upstream of the particle trap in the second flow direction.
  • the exhaust gas recirculation line is preferably part of a low-pressure EGR (exhaust gas recirculation) system in which the exhaust system is therefore embodied with at least one turbocharger, and the exhaust gas recirculation line is disposed downstream of the turbocharger as viewed in the second flow direction.
  • EGR exhaust gas recirculation
  • the hollow body described herein can also, as an exhaust gas purification unit, advantageously be independent of the specific configuration in the exhaust system or in the exhaust gas recirculation line.
  • a nonwoven for treating exhaust gasses in an exhaust gas recirculation line will be presented briefly herein, in which case it can also advantageously be used independently of the configuration, such as is described herein, for example also in an embodiment such as is specified in Published German Application DE 10 2006 013 709 A1, corresponding to U.S. Patent Application Publication No. US 2009/0071151, to which reference is additionally also made in this case with respect to the description of the configuration.
  • the nonwoven is a fabric in the manner of a 3-shed twill or 5-shed twill fabric (referred to as “Atlas fabric”, TELA fabric or fabric with a 5-shed Atlas binding).
  • Atlas fabric TELA fabric or fabric with a 5-shed Atlas binding.
  • Such a nonwoven has warp filaments and weft filaments which are woven with one another at an angle of approximately 90°.
  • the direction along the warp filaments is subsequently referred to as the warp direction and the direction along the weft filaments as the weft direction.
  • the weaving of warp filaments and weft filaments is carried out in such a fabric so that the weft filaments run in each case above four warp filaments lying one on top of the other and subsequently below an individual warp filament.
  • This profile repeats for each weft filament over the entire nonwoven.
  • Two weft filaments lying one next to the other run in each case below different warp filaments. It is preferred in this case that a weft filament runs in each case below the warp filament after the next, below which the directly adjacent weft filament runs.
  • This configuration results in a regularly repeated pattern which runs obliquely with respect to the weft direction and obliquely with respect to the warp direction in the nonwoven.
  • the nonwoven which may also be referred to as a fleece or mat and is woven in this way, is particularly robust and has a relatively smooth surface.
  • wire filaments used as warp and weft filaments
  • relatively thick warp filaments for example 160 ⁇ m filament diameter
  • relatively thin weft filaments for example 150 ⁇ m filament diameter
  • warp filaments have a diameter of at least 156 ⁇ m and at maximum 164 ⁇ m
  • weft filaments have a diameter of at least 146 ⁇ m and at maximum 154 ⁇ m.
  • the relatively thin weft filaments bend to a greater extent than the relatively thick warp filaments. This influences the shape of the available meshes.
  • Such a nonwoven has rectangular meshes which have a greater mesh width in the weft direction than in the warp direction.
  • the mesh width in the warp direction should preferably on average be approximately 77 ⁇ m. In this context, a tolerance of +/ ⁇ 6 ⁇ m is appropriate.
  • an average mesh width in the warp direction is thus at least 71 ⁇ m and at maximum 83 ⁇ m.
  • the mesh width should preferably be on average 149 ⁇ m. In this context, a tolerance of +/ ⁇ 10 ⁇ m is appropriate.
  • an average mesh width in the weft direction is thus at least 139 ⁇ m and at maximum 159 ⁇ m.
  • the preferred mesh width and preferred filament diameter result in a mesh number of 107 meshes/inch or approximately 41 meshes/mm in the warp direction and a mesh number of 85 meshes/inch or approximately 33 meshes/mm in the weft direction.
  • a maximum mesh width in both the warp and weft directions in order to ensure that particles above a certain size generally cannot pass through the nonwoven.
  • the largest permissible mesh width in the warp direction of 58 ⁇ m is proposed as a tolerance.
  • a mesh must therefore have at maximum a mesh width of 135 ⁇ m in the warp direction.
  • the maximum permissible mesh width in the weft direction of 84 ⁇ m is proposed as a tolerance.
  • a mesh must therefore have at maximum a mesh width of 233 ⁇ m in the weft direction.
  • the properties of such a nonwoven can be checked, for example, by using a microscope.
  • the number of filaments per length unit in the warp direction or weft direction can be determined by counting the filaments per length unit.
  • the average mesh width can then be determined by subtracting the filament wire diameter from the pitch (distance between two filaments in the nonwoven).
  • the maximum permissible mesh width at least partially predefines the filter permeability. This can be determined by using a ball passage test. The greatest opening of the meshes in a fabric (nonwoven) is referred to as the ball passage. A precisely round ball can still pass through the fabric and a relatively large one is held back. From the definition it is apparent that given a genuinely polygonal mesh, the smaller of the two mesh widths (mesh width in the warp direction) substantially determines the ball passage.
  • the permissible ball diameter in the case of a test with the nonwoven proposed in this case should be between 140 ⁇ m and 180 ⁇ m, preferably between 150 ⁇ m and 170 ⁇ m, and in particular between 155 ⁇ m and 160 ⁇ m.
  • the permissible ball passage is therefore greater than the above-stated mesh width in the warp direction. This is the case because due to the fabric structure of the nonwoven and to the filament wire diameters in relation to the mesh widths, slightly enlarged passage openings compared to the defined mesh widths result obliquely with respect to the plane of the nonwoven (in particular not orthogonally with respect to the plane of the nonwoven spanned between the warp direction and the weft direction) for a predefined mesh width.
  • the thickness of the nonwoven should be between 0.4 and 0.5 mm and preferably be approximately 0.44 mm.
  • the nonwoven should have an air permeability of between at minimum 4000 l/m 2 s and at maximum 8000 l/m 2 s, preferably between at minimum 5000 l/m 2 s and at maximum 7000 l/m 2 s and in particular between at minimum 5500 l/m 2 s and at maximum 6000 l/m 2 s, if the difference in pressure present across the nonwoven is 2 mbar.
  • the nonwoven should be free of oil films, auxiliary materials and other impurities.
  • the wire filaments are preferably sintered to one another in this case in the form being used, that is to say in particular are not welded to one another.
  • the nonwoven is used as the wall of a hollow body in the manner of a sieve, it may at least be characterized by one of the following parameters:
  • the degree of separation of the sieve of at least 0.05 mm, in particular 0.1 mm or even 0.25 mm (particles with a relatively small diameter generally flow through the sieve);
  • hollow body having at least one cap and having a bypass
  • the mesh width of the sieve is preferably in the region of less than 0.3 mm, in particular of less than 0.2 mm and quite particularly preferably of less than 0.15 mm.
  • the mesh width should equally preferably be at least 0.05 mm (millimeters).
  • FIG. 1 is a fragmentary, diagrammatic, longitudinal-sectional view of a first embodiment variant of the invention in which a partially permeable hollow body is disposed in an exhaust gas line;
  • FIG. 2 is a fragmentary, longitudinal-sectional view of a further embodiment variant of the invention, in which a partially permeable hollow body is disposed in an exhaust gas recirculation line;
  • FIG. 3 is a perspective view of a partially permeable hollow body formed from a corrugated layer
  • FIG. 4 is an end-elevational view of a partially permeable hollow body which is formed from a layer with elevated portions and depressions and has an additional supporting layer;
  • FIG. 5 is a longitudinal-sectional view of an automobile with an exhaust system which has a particle trap according to the invention.
  • FIG. 6 includes enlarged front-elevational, bottom-plan and side-elevational views of a configuration of a nonwoven for a hollow body.
  • FIG. 1 there is seen a first embodiment variant of a particle trap 6 according to the invention.
  • An exhaust gas line 2 has a first central cross section 10 and a first enlarged cross section 11 , which is widened in the region of a hollow body 3 .
  • Exhaust gas flows through the exhaust gas line 2 in a second flow direction 26 along the profile of the exhaust gas line 2 .
  • the direction of the profile of the exhaust gas line 2 is also denoted as a first main direction 17 .
  • An exhaust gas recirculation line 1 branches off from the exhaust gas line 2 .
  • Exhaust gas flows in a first flow direction 25 in the exhaust gas recirculation line 1 along a second main direction 21 of the exhaust gas recirculation line 1 .
  • the exhaust gas line 2 forms push-in ring connections 9 .
  • the partially permeable hollow body 3 is attached in the push-in ring connections 9 .
  • the radially permeable hollow body 3 has a wall 27 which defines an inner space or chamber 5 .
  • the inner space 5 has two open sides 28 .
  • the permeable hollow body 3 is embodied in the manner of a tube which is open on both sides.
  • the shape of the hollow body 3 is referred to as a primary shape 7 .
  • the permeable hollow body 3 is connected in a materially joined fashion through the use of the push-in ring connection 9 to the exhaust system and to itself.
  • the push-in ring connections 9 can also be provided directly during the manufacture of the exhaust gas line 2 , for example by deep drawing or punching.
  • the primary shape 7 of the partially permeable hollow body 3 can be oriented in the exhaust gas line 2 in such a way that the primary shape 7 runs in the first main direction 17 .
  • the partially permeable hollow body 3 with its two open sides 28 , therefore continues the profile of the exhaust gas line 2 .
  • FIG. 2 shows a further advantageous refinement of a suitable particle trap 6 .
  • the first flow direction 25 of the exhaust gas is in the second main direction 21 and the second flow direction 26 of the exhaust gas is in the first main direction 17 of the exhaust gas line 2 .
  • the exhaust gas recirculation line 1 has a second enlarged cross section 13 , in the region of the particle trap 6 , which is widened as compared to a second central cross section 12 .
  • a partially permeable hollow body 3 which is embodied as a tube, is provided in the second enlarged cross section 13 .
  • the partially permeable hollow body 3 again has a wall 27 which surrounds an inner space 5 as well as two open sides 28 .
  • One open side 28 of the partially permeable hollow body 3 is closed off by a cap 8 (in a gastight fashion).
  • FIG. 2 also indicates a cumulative or alternative shape of the exhaust gas conducting device. It is therefore also possible for the exhaust gas not to be conducted further in a linear fashion through the exhaust gas line 2 , but rather it is also possible to perform a multiple diversion, downstream of which the (entire) exhaust gas is firstly diverted into the enlarged cross section 13 . Starting from there, the portion of the exhaust gasses which does not flow through the particle trap 6 is introduced again into the exhaust gas line 2 . The multiple deflection also results in intense cleaning of the particle trap 6 by the exhaust gas which flows past in this case.
  • a refinement of the particle trap 6 is also possible in which both a partially permeable hollow body 3 is provided in the exhaust gas line 2 and a second partially permeable hollow body 3 is provided in the exhaust gas recirculation line 1 . All of the other improvements and developments, explained separately for the refinements of the invention illustrated in FIG. 1 and in FIG. 2 , can also be used for this combination within the scope of the invention.
  • FIG. 3 is a perspective view of a partially permeable hollow body 3 which is formed from a corrugated layer 16 .
  • the layer 16 is folded together to form the wall 27 of the tubular primary shape 7 (in this case, for example, a cylinder) with an inner space 5 , and forms a region 20 which overlaps with itself. This results in two open sides 28 of the primary shape 7 .
  • the layer 16 has a secondary structure 4 , formed by elevated portions or elevations 14 and depressions 15 , on the surface or over the periphery or circumference. These elevated portions 14 and depressions 15 of the layer 16 engage in one another in a form-locking fashion in the overlapping region 20 .
  • a materially joined connection in the overlapping region 20 is not absolutely necessary as a result, in particular if the open sides 28 of the tubular hollow body 3 are connected to a housing, for example at push-in ring connections 9 , on the exhaust gas line 2 .
  • FIG. 4 shows a further refinement of the tubular hollow body 3 in which a supporting layer 18 is used, in addition to the layer 16 .
  • Elevated portions 14 and depressions 15 of the layer 16 engage in a form-locking fashion in a corresponding surface shape of the supporting layer. It is therefore possible to bring about a considerably larger resistance of the partially permeable hollow body 3 to the difference in pressure between the inside and the outside.
  • the supporting layer 18 can also support the layer 16 from the inside depending on the active difference in pressure between the exhaust gas line and the exhaust gas recirculation line.
  • FIG. 5 shows an automobile 22 with an internal combustion engine 23 and an exhaust system 19 .
  • the exhaust system 19 has a ceramic filter 24 , in particular a soot particle filter or soot burn-off filter as well as a (downstream) particle trap 6 .
  • FIG. 5 shows a second flow direction 26 away from the internal combustion engine 23 through the exhaust gas line 2 , and a first flow direction 25 away from the particle trap 6 through the exhaust gas recirculation line 1 to the internal combustion engine 23 .
  • the particle trap 6 is disposed in the exhaust system 19 in such a way that the first flow direction 25 runs directly downstream of the particle trap 6 or in the region of the configuration of the hollow body in opposition to the force 29 of gravity. The force 29 of gravity therefore additionally counteracts the deposition of particles on the particle trap 6 .
  • FIG. 6 shows three views illustrating the construction of a wall 27 formed of a metallic nonwoven in the manner of a 5-shed twill or dobby (referred to as “Atlas fabric”).
  • Atlas fabric a metallic nonwoven in the manner of a 5-shed twill or dobby
  • relatively thick warp filaments 30 and relatively thin weft filaments 31 only penetrate after four filaments have been passed.
  • relatively large meshes 32 or mesh openings are formed.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Textile Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Filtering Materials (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
US13/026,829 2008-08-13 2011-02-14 Particle trap for an exhaust gas recirculation line and automobile having a particle trap Abandoned US20110173956A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102008038983A DE102008038983A1 (de) 2008-08-13 2008-08-13 Partikelabfangvorrichtung für eine Abgasrückführleitung
DE102008038983.8 2008-08-13
PCT/EP2009/060401 WO2010018183A1 (de) 2008-08-13 2009-08-12 Partikelabfangvorrichtung für eine abgasrückführleitung

Related Parent Applications (1)

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PCT/EP2009/060401 Continuation WO2010018183A1 (de) 2008-08-13 2009-08-12 Partikelabfangvorrichtung für eine abgasrückführleitung

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EP (1) EP2326823B1 (de)
JP (1) JP5551700B2 (de)
KR (1) KR101273038B1 (de)
CN (1) CN102124202B (de)
DE (1) DE102008038983A1 (de)
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US20100037871A1 (en) * 2008-08-18 2010-02-18 Hartmut Sauter Internal combustion engine
US8771392B2 (en) 2010-06-28 2014-07-08 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Device for particle separation in an exhaust-gas recirculation system and motor vehicle having the device
US20190383244A1 (en) * 2018-06-15 2019-12-19 Hyundai Motor Company Egr filter for preventing clogging
US20210370207A1 (en) * 2020-05-27 2021-12-02 Hyundai Motor Company EM Filter for EGR Cooler

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JP5397277B2 (ja) * 2010-03-09 2014-01-22 三菱自動車工業株式会社 排気還流装置
DE102013111033B4 (de) 2012-10-08 2019-10-17 Witzenmann Gmbh Verfahren und Vorrichtung für Thermomanagement einer Kfz-Abgasanlage
DE102013000247A1 (de) * 2013-01-08 2014-07-10 Volkswagen Aktiengesellschaft Abgasanlage für eine Verbrennungskraftmaschine und Kraftfahrzeug mit einer solchen
DE102013109338A1 (de) * 2013-08-28 2015-03-05 Witzenmann Gmbh Entkoppelelement für eine Abgasanlage
DE102013110127B4 (de) 2013-09-13 2017-11-02 Witzenmann Gmbh Leitungsteil für eine Abgasanlage mit Abgasrückführung
DE102013111313A1 (de) 2013-10-14 2015-04-16 Witzenmann Gmbh Leitungsteil für eine Abgasanlage mit Abgasrückführung
GB2539181B (en) * 2015-06-01 2019-06-12 Ford Global Tech Llc An exhaust gas recirculation system
DE102015113073B4 (de) 2015-08-07 2019-06-19 Witzenmann Gmbh Leitungsteil mit Filterelement
US10221743B2 (en) * 2015-08-25 2019-03-05 Ford Global Technologies, Llc Method and system for exhaust particulate matter sensing
DE102015116298B4 (de) 2015-09-25 2019-05-16 Witzenmann Gmbh Ellipsenrohrfilter und von einem Fluidstrom durchströmte oder durchströmbare Leitung

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US8771392B2 (en) 2010-06-28 2014-07-08 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Device for particle separation in an exhaust-gas recirculation system and motor vehicle having the device
US20190383244A1 (en) * 2018-06-15 2019-12-19 Hyundai Motor Company Egr filter for preventing clogging
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Publication number Publication date
KR101273038B1 (ko) 2013-06-10
RU2011109081A (ru) 2012-10-27
RU2506447C2 (ru) 2014-02-10
JP2011530673A (ja) 2011-12-22
WO2010018183A1 (de) 2010-02-18
JP5551700B2 (ja) 2014-07-16
KR20110044285A (ko) 2011-04-28
DE102008038983A1 (de) 2010-02-18
EP2326823B1 (de) 2012-11-14
EP2326823A1 (de) 2011-06-01
PL2326823T3 (pl) 2013-03-29
CN102124202B (zh) 2014-02-26
CN102124202A (zh) 2011-07-13

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