WO2012045673A1 - Filtre de recirculation de gaz d'échappement, moteur à combustion interne - Google Patents

Filtre de recirculation de gaz d'échappement, moteur à combustion interne Download PDF

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Publication number
WO2012045673A1
WO2012045673A1 PCT/EP2011/067085 EP2011067085W WO2012045673A1 WO 2012045673 A1 WO2012045673 A1 WO 2012045673A1 EP 2011067085 W EP2011067085 W EP 2011067085W WO 2012045673 A1 WO2012045673 A1 WO 2012045673A1
Authority
WO
WIPO (PCT)
Prior art keywords
exhaust gas
gas recirculation
filter
exhaust
filter according
Prior art date
Application number
PCT/EP2011/067085
Other languages
German (de)
English (en)
Inventor
Hartmut Sauter
Bernhard Schwalk
Original Assignee
Mahle International 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 Mahle International Gmbh filed Critical Mahle International Gmbh
Priority to EP11763709.0A priority Critical patent/EP2625415A1/fr
Publication of WO2012045673A1 publication Critical patent/WO2012045673A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/15—Arrangement 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit

Definitions

  • the present invention relates to an exhaust gas recirculation filter for installation in an external exhaust gas recirculation line of an internal combustion engine, in particular of a motor vehicle, having the features of the preamble of claim 1 and an internal combustion engine equipped therewith.
  • An internal combustion engine which is used in particular in a motor vehicle, usually has a fresh air line for supplying fresh air to cylinders of the internal combustion engine and an exhaust pipe for discharging exhaust gas from the cylinders.
  • a fresh air line for supplying fresh air to cylinders of the internal combustion engine
  • an exhaust pipe for discharging exhaust gas from the cylinders.
  • Exhaust gas recirculation line may be provided which the exhaust pipe with the
  • Fresh air line fluidly connects and thus returns exhaust gas from the exhaust pipe to the fresh air line.
  • an exhaust gas recirculation cooler in the exhaust gas recirculation line in order to cool the recirculated exhaust gas.
  • Exhaust gas recirculation line runs outside the internal combustion engine, it is an external exhaust gas recirculation line.
  • an external exhaust gas recirculation it may be appropriate to connect the exhaust gas recirculation line downstream of a catalyst and / or a particulate filter to the exhaust pipe to
  • the problem here is that conventional catalysts and particulate filter have ceramic substrates and secrete due to aging effects particles that are carried in the exhaust gas flow.
  • the vibrations and vibrations occurring during operation of an internal combustion engine produce a certain amount of abrasion on a ceramic catalyst element.
  • This abrasion forms particles that can be carried along by the exhaust gas flow.
  • Metallic particles, such as welding beads, can occur which, for example, can be detached from the welded assembly exhaust pipe by vibration. Such particles can damage the internal combustion engine as well as a charge device optionally arranged in the fresh air line.
  • an exhaust gas recirculation filter which can be installed in such an external exhaust gas recirculation line.
  • Such an exhaust gas recirculation filter has a filter housing in which a filter element is arranged, which filters out particles which are entrained in the recirculated exhaust gas. This effectively prevents damage to the
  • the known exhaust gas recirculation filter is provided for installation upstream of the exhaust gas recirculation cooler in the exhaust gas recirculation line in order to protect the exhaust gas recirculation cooler from exposure to particles.
  • Exhaust gas turbocharger is connected to the fresh air line.
  • the present invention deals with the problem for a
  • the invention is initially based on the general idea, the filter element or the exhaust gas recirculation filter in the return line downstream of the
  • Temperature dependence of the flow resistance is so strong that by the arrangement of the filter element or the exhaust gas recirculation filter downstream of the exhaust gas recirculation cooler, the flow resistance, for example.
  • the flow resistance for example.
  • Exhaust gas recirculation cooler can be used cheaper materials for the production of the exhaust gas recirculation filter or the filter element.
  • a filter housing of the exhaust gas recirculation filter, in which the filter element is arranged are now made of plastic, while in a conventional arrangement on the hot side of the exhaust gas recirculation cooler must necessarily be made of metal or ceramic.
  • a mist eliminator may be provided downstream of the exhaust gas recirculation filter or the filter element.
  • a droplet can liquid droplet, in particular water droplets, which are carried in the exhaust gas flow, from the exhaust gas flow are excreted.
  • Such drops of liquid can arise in and downstream of the exhaust gas recirculation cooler, especially by condensation.
  • the drops are predominantly formed on the cold walls of the radiator.
  • the filter element a
  • Such droplets can represent a comparatively high mechanical load for a compressor of an exhaust gas turbocharger, which can lead to abrasion and corrosion of a compressor wheel or a compressor housing.
  • the arrangement of the mist eliminator downstream of the filter element can reduce such a risk of damaging the compressor.
  • the exhaust gas recirculation filter with integrated droplet separator can be arranged particularly simply downstream of the exhaust gas recirculation filter in the exhaust gas recirculation line.
  • a sump for collecting separated liquid may also be formed in the filter housing.
  • the separated liquid for operating phases of the internal combustion engine in which condensate is obtained in the recirculated exhaust gas be collected or stored to later in operating phases in which no condensation, but rather an evaporation or a
  • the sump forms a within the filter housing
  • the separated liquid can also be actively evaporated, for example.
  • the sump can be designed comparatively small with regard to its collecting volume.
  • the exhaust gas recirculation filter for the evaporation or evaporation of the liquid collected in the sump is not dependent on an operating phase of the internal combustion engine, which also provides sufficient heat for evaporating the stored in the sump condensate in the exhaust downstream of the exhaust gas recirculation cooler.
  • said heater may comprise at least one PTC element, wherein PTC stands for Positive Temperature Coefficient.
  • PTC Positive Temperature Coefficient
  • the heater can heat a lying in the installed position of the exhaust gas recirculation filter in the direction of gravity bottom bottom of the sump. This results in a particularly effective heat coupling between heating and condensate.
  • the heater may also be configured as a separate component, which is installed in a filter housing formed on the heating receptacle. Especially Thus, the heater can be manufactured as a separate unit and installed as such unit in the filter housing.
  • a wick may be provided, which projects on the one hand into the sump and on the other hand is exposed to a gas flow.
  • the wick can be laid so that it is exposed to the exhaust gas flow in the exhaust pipe or in the exhaust gas recirculation line or that it is exposed to the fresh air flow in the fresh air line.
  • a drain opening may be provided which is fluidly connected to the sump to the accumulated in the sump liquid from the filter housing
  • This drain opening can expediently be arranged in the region of the filter element, in particular radially thereto.
  • a dividing wall can be arranged between the drain opening and the filter element, in order to avoid a direct flow of the drain opening and an arrival or flow through the
  • the mist eliminator a transverse wall prevents direct flow of the inlet region of the drain opening and thus supports an arrival or flow through the droplet, which improves its efficiency.
  • the mist eliminator a
  • the sump may be formed by a formed in the interior of the filter housing, in particular trough-shaped depression, which is arranged in the installed position of the exhaust gas recirculation filter in the direction of gravity below the Tropfenabscheiders and open at the top.
  • the sump has a particularly simple geometric shape, whereby it is also particularly simple and inexpensive to implement within the filter housing.
  • the filter housing may have, downstream of the drop separator, a guide collar projecting counter to the exhaust gas flow direction, which collects liquid moving along an inner side of the filter housing in the exhaust gas flow direction and discharges in the direction of the sump. Because the
  • the sump can also extend over a substantial portion of the filter element, that is, clearly opposite to the exhaust gas flow direction away from the mist eliminator. As a result, the collecting volume of the sump can be increased accordingly.
  • the mist eliminator can be configured as a lamella separator, which several more parallel to each other has extending and arranged in the flow path of the exhaust gas flow slats.
  • Such fins may have a wave profile, in particular in the exhaust gas flow direction.
  • each lamella can have at least one collecting channel oriented in the direction of the gravitational force, which discharges the separated liquid, in particular to a drainage device of the droplet separator.
  • the drainage device can supply the separated liquid to the aforementioned sump.
  • the slats have a slat longitudinal direction, with which they in the
  • Exhaust flow direction are oriented, and a lamella transverse direction, with which they protrude into the flow path of the exhaust gas.
  • the slats are arranged with their slats transverse direction with respect to the direction of gravity inclined, in particular
  • the lamellae are inclined with respect to the direction of gravity in such a way that they come from or to the filter element in the
  • Exhaust flow direction are inclined.
  • Liquid droplets in any case meet against such a blade and attach to it, while the inclination in the transverse direction causes the exhaust gas flow along the lamella deposited liquid droplets along the slat transverse direction drives and thus supports the discharge of the separated liquid.
  • the slats can extend into the aforementioned sump, resulting in a particularly simple structure.
  • the lamellae it is possible for the lamellae to be designed as a monolithic lamella block which comprises a lamella carrier connecting the lamellae to one another.
  • the slats can be particularly simple, namely use as a unit in the form of the fins block in the filter housing.
  • the monolithic lamella block may comprise the aforementioned partition wall and / or the likewise aforementioned transverse wall.
  • the filter housing is made of plastic.
  • the exhaust gas recirculation filter is particularly inexpensive.
  • the filter element preferably has a filter material of a lattice structure. Preference is given to a woven grid structure. A mesh size of the lattice structure is preferably less than 100 pm, so that solid particles larger than 100 pm can be reliably filtered out of the exhaust gas flow.
  • the filter housing may have an exhaust gas inlet and axially aligned therewith an exhaust gas outlet.
  • the filter element can be arranged coaxially with the exhaust gas inlet and exhaust gas outlet, which likewise favors a low flow resistance.
  • the filter housing can be a monolithic inlet block having a Has exhaust inlet, and having a monolithic exhaust block having an exhaust outlet, which simplifies the structure of the filter housing.
  • a monolithic intermediate block may be provided, which is arranged axially between the inlet block and the outlet block.
  • the intermediate block between the inlet block and the outlet block can be axially braced, whereby the intermediate block by this tension on
  • Filter housing is attached or integrated therein.
  • the above-mentioned drain opening may be formed in the intermediate block.
  • the droplet separator can be arranged in a separation chamber of the filter housing, which merges via a cross-sectional reduction into an exhaust gas outlet.
  • the flow-through cross-section can be kept substantially constant despite the filter element and droplet separator within the filter housing in order to avoid excessive pressure increase in the flow through the exhaust gas recirculation filter.
  • at least one pressure relief opening can now be provided, which the
  • Separating chamber through the cross-section reduction fluidly connects with the exhaust gas outlet.
  • the filter element is expediently configured as a mechanically filtering filter element, that is, by a mesh size or pore size of its
  • the filter element may comprise a filter material of lattice structure secured to an annular flange by which the filter element is secured to the filter housing, wherein it may be provided in particular that the annular flange axially braces axially between the aforesaid intermediate block and said inlet block and thereby is attached to the filter housing.
  • the engine equipped with such an exhaust gas recirculation filter can preferably be designed as a supercharged internal combustion engine having a charging device in the fresh air line. The exhaust gas recirculation line is then connected upstream of the charging device to the fresh air line.
  • the charging device may be formed by a compressor of an exhaust gas turbocharger whose turbine is arranged in the exhaust pipe, in which case the exhaust gas recirculation line is connected downstream of the turbine to the exhaust pipe.
  • a droplet separator can be arranged in the exhaust pipe downstream of the filter element, which is preferably arranged in the filter housing, which also contains the filter element.
  • Exhaust gas recirculation filter is installed in the exhaust gas recirculation line so that the
  • Exhaust gas flow direction in the filter housing runs perpendicular to the direction of gravity. This makes it possible to use the gravity for discharging or for driving the deposited condensate, for example. To supply the condensate to the sump.
  • Fig. 1 is a greatly simplified schematic diagram of a schematic
  • 3 to 5 each show an isometric longitudinal section of the exhaust gas recirculation cooler, but other embodiments.
  • an internal combustion engine 1 which in a
  • Motor vehicle may be arranged, an engine block 2, the more
  • combustion chambers 3 Contains combustion chambers 3.
  • four combustion chambers 3 are shown without limiting the generality.
  • the combustion chambers 3 are each located in a cylinder 4, in which a piston, not shown, is arranged adjustable in stroke.
  • the internal combustion engine 1 is a piston engine, which may be designed as a diesel engine or as a gasoline engine. Shown is a series engine. Likewise, a V-engine or a W-motor or a boxer engine is conceivable.
  • the internal combustion engine 1 has a fresh air system 5, passes through the fresh air to the combustion chambers 3.
  • the fresh air system 5 has in the example a fresh air line 6, in which an air filter 7 is arranged and to a Fresh air manifold 8 leads, which supplies the fresh air via individual tubes 9 to the individual combustion chambers 3.
  • the fresh air system 5 can also be designed with two columns, ie have two parallel fresh air lines 6.
  • the internal combustion engine 1 has an exhaust system 10, via which exhaust gas is discharged from the combustion chambers 3.
  • the exhaust system 10 has z. Ex. An exhaust pipe 1 1, which goes off from an exhaust manifold 12, which in turn is connected via individual tubes 13 to the combustion chambers 3. Likewise, it is possible to design the exhaust system 10 in two columns, so that it then has two mutually parallel exhaust pipes 1 1.
  • the exhaust system 10 may include a particulate filter 14 which is disposed in the exhaust pipe 11.
  • the exhaust system 10 further exhaust purification devices, such. For example, an SCR catalyst, which is usually arranged downstream of the particulate filter 14, and an oxidation catalyst, not shown, which is usually arranged upstream of the particulate filter 14.
  • the particle filter 14 is expediently arranged downstream of a turbine 24 so that the turbine 24 has as much exhaust gas enthalpy as possible.
  • muffler devices may be present.
  • the internal combustion engine 1 is also equipped with an exhaust gas recirculation system 15, which is also referred to below as the EGR system 15. It serves to recirculate exhaust gas from the exhaust system 10 to the fresh air system 5.
  • the EGR system 15 an exhaust gas recirculation line 16, which in the
  • the EGR line 16 is connected via an extraction point 17 to the exhaust system 10 and to the exhaust pipe 1 1 and connected via a discharge point 18 to the fresh air system 5 and at the fresh air line 6.
  • the removal point 17 is positioned downstream of the particle filter 14.
  • the discharge point 18 is positioned downstream of the air filter 7.
  • the EGR system 15 contains in the EGR line 16 an exhaust gas recirculation cooler 19, which is also referred to below as an EGR cooler 19 becomes.
  • the EGR cooler 19 may, for example, be connected to a cooling circuit 20, which in turn may be coupled to a cooling circuit, not shown, of the internal combustion engine 1 for cooling the engine block 2 heat transfer or may form part of it.
  • the EGR system 15 has a
  • Exhaust gas recirculation valve 21, which can also be referred to as EGR valve 21 below.
  • the EGR valve 21 is disposed in the EGR passage 16 upstream of the EGR cooler 19. It is also possible to arrange the EGR valve 21 downstream of the EGR cooler 19 in the EGR passage 16.
  • the EGR valve 21 may also be integrated in the EGR cooler 19 on the input side or on the output side.
  • the internal combustion engine 1 shown here is charged.
  • it has a charging device 22, which in the preferred example shown by a
  • Exhaust gas turbocharger is formed, which is also referred to below with 22.
  • the charging device 22 and the exhaust gas turbocharger 22 With the help of the charging device 22 and the exhaust gas turbocharger 22, the
  • the charging device is configured as an exhaust gas turbocharger 22, which has a compressor 23 arranged in the fresh air system 5 or in its fresh air line 6 and a turbine 24 connected thereto which is arranged in the exhaust system 10 or in the exhaust pipe 11 thereof.
  • the compressor 23 arranged in the fresh air system 5 or in its fresh air line 6 and a turbine 24 connected thereto which is arranged in the exhaust system 10 or in the exhaust pipe 11 thereof.
  • the fresh air system 5 or in the fresh air line 6 may optionally downstream of the compressor 23 a
  • Intercooler 25 may be arranged, which is preferably connected to a cooling circuit 26.
  • this cooling circuit 26 may, for example, be coupled to the aforementioned cooling circuit of the internal combustion engine 1 for cooling the engine block 2 heat transfer or form part of it.
  • a purely exemplary throttle valve 27 is shown in the fresh air system 5 z. Ex. In the fresh air line 6 is arranged, downstream of the charge air cooler 25 and upstream of the fresh air manifold 8. Likewise, the throttle 27 may be integrated on the input side into the fresh air manifold 8. Furthermore, in principle, a throttle-free design of the
  • the exhaust system 10 optionally has an exhaust throttle 28, which is arranged in the exhaust pipe 11 downstream of the removal point 17. With the help of such an exhaust throttle 28, if necessary, the pressure in the exhaust gas upstream of the exhaust throttle 28 can be increased to the pressure difference between
  • Extraction point 17 and discharge point 18 to enlarge. This pressure difference drives the recirculated exhaust gas.
  • the internal combustion engine 1 is also equipped with a filter element 29 which serves to filter out particles entrained in the recirculated exhaust gas.
  • This filter element 29 is arranged in the EGR line 16 downstream of the EGR cooler 19. Thus, the filter element 29 is only cooled
  • the filter element 29 has a comparatively low flow resistance for a relatively cold exhaust gas flow, while it has a comparatively high flow resistance for a relatively hot exhaust gas flow.
  • a mist eliminator 30 is arranged downstream of the filter element 29 in the EGR line 16 downstream of the filter element 29, with the aid of drops or Droplets can be separated from the exhaust gas flow. Droplets can be generated in the exhaust gas flow, especially downstream of the EGR cooler 19 by condensation, the filter element 29 being particularly suitable for forming condensate and bringing it together to form droplets.
  • Fig. 1 also shows a preferred embodiment in which the
  • Filter element 29 and the droplet 30 are arranged in a common housing 31, namely in a filter housing 31 of an exhaust gas recirculation filter 32.
  • This exhaust gas recirculation filter 32 will be explained in more detail below with reference to FIG. 2 and may also be referred to below as EGR filter 32.
  • the EGR filter 32 is installed in the EGR passage 16 so that in this installation state
  • Exhaust gas flow or its exhaust gas flow direction, which is indicated in Fig. 2 by an arrow 33, in the filter housing 31 is perpendicular to the direction of gravity, which is indicated in Fig. 2 by an arrow 34.
  • the EGR filter 32 accordingly has the filter housing 31, in which the filter element 29 and downstream thereof
  • Droplet 30 are arranged.
  • the filter housing 31 according to Flg. 2 an inlet flange 35 and an outlet flange 36, with which the filter housing 31 can be screwed to corresponding mating flanges of the EGR line 16.
  • corresponding screw bushes 37 may be provided on the respective flange 35, 36, of which in Fig. 2, however, only one is recognizable.
  • the flanges 35, 36 are equipped with seals 38.
  • a sump 39 is also formed in the filter housing 31. The sump 39 is in the installed state with respect to
  • the EGR filter 32 shown in FIG. 2 is equipped with a heater 40, by means of which the sump 39 or at least the liquid collected in the sump 39 can be heated. With the help of the heater 40, the liquid collected in the sump 39 can be heated as needed so far that it again evaporated and entrained with the exhaust gas flow 33 or from the
  • Filter housing 31 can be removed.
  • the heater 40 has at least one PTC element 41.
  • Target temperature is largely accurately adjustable, without requiring a complex control of the PTC element 41 supplied current is required. The closer the PTC element 41 approaches the target temperature to be set, the greater will be its electrical resistance and the lower will be
  • the heater 40 is arranged on the filter housing 31 so that it is a bottom 42 of the sump 39 can be heated, which is in the installation position of the EGR filter 32 shown below. 2 shows a preferred embodiment in which the heater 40 with respect to the rest of the EGR filter 32, a separate component or
  • Assembly forms which is attached to the filter housing 31.
  • the filter housing 31 has a heater receptacle 43, in which the heater 40 is installed.
  • the embodiments of the EGR filter 32 shown in FIGS. 3 to 5 can also optionally be equipped with such a heater 40.
  • the mist eliminator 30 is equipped in the example of FIG. 2 with a drainage device 44.
  • the drainage device 44 is formed by a with respect to the direction of gravity 34 at the lower end of the Tropfenabscheiders 30 arranged curved, in particular cylinder-segment-shaped, wall containing a plurality of passage openings 45, with respect to the
  • the embodiments of the EGR filter 32 shown in FIGS. 3 to 5 can also optionally be equipped with such a drainage device 44.
  • the sump 39 is formed by a trough-shaped recess 46, which is formed in the interior of the filter housing 31 and which is open with respect to the direction of gravity 34 upwards and disposed below the Tropfenabscheiders 30.
  • the depression 46 or the sump 39 is dimensioned in the opposite direction to the exhaust gas flow direction 33 via the droplet separator 30, so that the sump 39 or the depression 46 also extends over a substantial portion of the filter element 29.
  • the filter element 29 may have at its, the droplet 30 facing the axial end of a bottom 49, for example, for the
  • Exhaust gas flow 33 may be configured impermeable, so that the
  • Filter element 29 must flow radially to flow through the filter element 29. This results in a direct flow admission to an inner side 48 of the filter housing 31, as a result of which droplet formation can also be observed on this inner side 48. Likewise, the filter element 29 at its the muck 30 facing bottom 49 for the
  • Exhaust gas flow 33 be permeable.
  • a guide collar 50 which protrudes axially against the exhaust gas flow direction 33 from the filter housing 31.
  • the guide collar 50 is preferably in the circumferential direction
  • Filter housing 31 is positioned so that liquid, which moves along the inside 48 of the filter housing 31 in the exhaust gas flow direction 33, collects on the guide collar 50 and is discharged in the direction of the sump 39.
  • the guide collar 50 forms between itself and the inside 48 of the
  • Filter housing 31 an annular groove in which the liquid can collect and flows due to gravity to the sump 39 out.
  • the mist eliminator 30 is designed as a lamella separator, which is arranged parallel to one another and perpendicular to the one in FIG. 2
  • Exhaust flow direction 33 arranged fins 51 has.
  • the fins 51 have at least in the embodiments of FIGS. 2 and 3 in the exhaust gas flow direction 33, a wave profile 52, which the recording and Deposition of liquid drops favors.
  • each louver 51 has at least one collecting channel 53 which extends in the direction of gravity 34 and which leads the separated liquid to the drainage device 44 in the embodiment shown in FIG. 2 and directly to the sump in the embodiments shown in FIGS. 3 to 5 39 feeds.
  • Collecting channel 53 is in this case formed in each case by an L-shaped or V-shaped profile body, which is opposite to the respective lamella 51
  • the filter housing 31 is made of plastic. This is possible since it is located downstream of the exhaust gas recirculation cooler 19 and is therefore exposed to comparatively cool exhaust gases.
  • the filter element 29 has a filter material, which preferably consists of a
  • Lattice structure exists whose mesh size can be less than 100 pm. It may be a metallic lattice structure or a lattice structure made of plastic.
  • a drain opening 54 which is fluidly connected to the sump 39 to lead out the accumulated in the sump 39 liquid from the filter housing 31, for example directly into an environment of the exhaust system, optionally in conjunction with a suitable valve device.
  • This drain opening 54 may be expediently arranged in the region of the filter element 29, in particular radially thereto.
  • a partition 55 may be arranged to provide a direct flow of the
  • a transverse wall 56 may divide the sump 39 into a drainage space 57 fluidly connected to the drainage opening 54 and a collecting space 58.
  • Transverse wall 56 is designed to be permeable to the separated liquid, for example by means of at least one passage opening 59 which the
  • Drainage space 57 fluidly connects through the transverse wall 56 with the collecting space 58. Also, this transverse wall 56 prevents direct flow of the inlet region of the drain opening 54 and thus supports an arrival or flow through the Tropfenabscheiders 30, which improves its efficiency.
  • the fins 51 have a direction indicated by a double arrow
  • the lamellae 51 are arranged with their lamella transverse direction 61 inclined relative to the direction of gravity 34, wherein it can be seen in the examples that the lamellae 51 are inclined with respect to the direction of gravity 34 in such a way that they come from or to the filter element 29, namely, with respect to the bottom 49 thereof have a distance 62 which is measured in the Abgaströmungscardi 33 and which increases in the direction of gravity 34.
  • the fins 51 are inclined with their slats longitudinal direction 60 relative to the exhaust gas flow direction 33. The inclination or setting of the fins 51 with respect to the exhaust gas flow direction 33 with respect to their longitudinal direction 60 or
  • Transverse direction 61 favors the separation effect, since the employment in the longitudinal direction 60 inevitably to a deflection or deflection of the Exhaust gas flow leads to the respective blade 51, so that entrained
  • Liquid droplets in any case meet against such a blade 51 and accumulate on it, while the inclination in the transverse direction 61 causes the exhaust gas flow drives the attached to the fins 51 liquid droplets along the lamella transverse direction 61 and so the discharge of
  • the fins 51 may extend according to the embodiment shown in FIG. 5 into the sump 39, resulting in a
  • FIGS. 2 to 5 are identical to each other. Furthermore, in all embodiments shown here, FIGS. 2 to 5 are identical to each other.
  • the slats 51 are configured as a monolithic slat block 63, the one connecting the slats 51 together
  • Plate carrier 64 includes.
  • the slats 51 can be inserted into the filter housing 31 in a particularly simple manner, namely as a unit in the form of the slat block 63.
  • Lamella block 63, the partition 55 and / or the transverse wall 56 include.
  • the filter housing 31 can have an exhaust gas inlet 65 and axially aligned with an exhaust gas outlet 66.
  • the filter element 29 may be arranged coaxially with the exhaust gas inlet 65 and the exhaust gas outlet 66, which likewise favors a low flow resistance.
  • the filter housing 32 as a whole is configured as a monolith, preferably of plastic, from the inlet 65 to the outlet 66.
  • the filter housing 32 has a monolithic inlet block 67, which has the exhaust gas inlet 65 and can be made in particular of plastic, and a monolithic outlet block 68, which has the exhaust gas outlet 66 and in particular Plastic can be made.
  • a monolithic inlet block 67 which has the exhaust gas inlet 65 and can be made in particular of plastic
  • a monolithic outlet block 68 which has the exhaust gas outlet 66 and in particular Plastic can be made.
  • the inlet block 67 is directly on
  • Outlet block 68 attached and in contact with this. A corresponding
  • an additional monolithic intermediate block 69 is provided, which is arranged axially between the inlet block 67 and the outlet block 68.
  • the intermediate block 69 between the inlet block 67 and the outlet block 68 may be axially braced, whereby the intermediate block 69 is fixed by this tension on the filter housing 32 and is integrated therein.
  • the aforesaid drainage opening 54 may be formed in the intermediate block 69 (FIGS. 3 and 4) or in the inlet block (FIG. 5). Corresponding grooves and associated axial seals are not specified.
  • the droplet separator 30 may be arranged in a separation chamber 70 of the filter housing 31, which merges via a cross-sectional reduction 71 into the exhaust gas outlet 66. In this way, can be kept substantially constant despite filter element 29 and droplet 30 within the filter housing 31 of the flow-through bare section in order to avoid an excessive pressure increase in the flow through the EGR filter 32.
  • at least one pressure relief opening 72 can now be provided, which the Separating chamber 70 through the cross-section reduction 71 fluidly connects to the exhaust gas outlet 66. It bypasses the respective
  • the filter element 29 is expediently designed as a mechanically filtering filter element 29, that is, by a mesh size or pore size of his
  • the filter element 29 may comprise a filter material of a grid structure 73 which is attached to an annular flange 74, via which the filter element 29 is attached to the filter housing 31. It can be provided according to FIGS. 3 and 4, that the annular flange 74 axially braced axially between the intermediate block 69 and the inlet block 67 and thereby secured to the filter housing 31.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

La présente invention concerne un moteur à combustion interne (1), notamment d'un véhicule automobile, comprenant au moins une conduite d'air frais (6) servant à acheminer de l'air frais aux cylindres (4) du moteur à combustion interne (1), au moins une conduite de gaz d'échappement (11) servant à évacuer les gaz d'échappement des cylindres (4), au moins une conduite de recirculation de gaz d'échappement (16) qui établit une liaison fluidique entre la conduite de gaz d'échappement (11) et la conduite d'air frais (6), un refroidisseur de recirculation de gaz d'échappement (19) agencé dans la conduite de recirculation de gaz d'échappement (16) ainsi qu'un élément filtrant (29) également agencé dans la conduite de recirculation de gaz d'échappement (16) et servant à filtrer les particules entraînées dans les gaz d'échappement en recirculation. L'objectif de l'invention est d'améliorer l'efficacité de la recirculation des gaz d'échappement. A cet effet, l'élément filtrant (29) est agencé dans la conduite de recirculation de gaz d'échappement (16) en aval du refroidisseur de recirculation de gaz d'échappement (19).
PCT/EP2011/067085 2010-10-05 2011-09-30 Filtre de recirculation de gaz d'échappement, moteur à combustion interne WO2012045673A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11763709.0A EP2625415A1 (fr) 2010-10-05 2011-09-30 Filtre de recirculation de gaz d'échappement, moteur à combustion interne

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010041982A DE102010041982A1 (de) 2010-10-05 2010-10-05 Abgasrückführfilter, Brennkraftmaschine
DE102010041982.6 2010-10-05

Publications (1)

Publication Number Publication Date
WO2012045673A1 true WO2012045673A1 (fr) 2012-04-12

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Country Status (3)

Country Link
EP (1) EP2625415A1 (fr)
DE (1) DE102010041982A1 (fr)
WO (1) WO2012045673A1 (fr)

Cited By (3)

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DE102012019240A1 (de) 2012-09-29 2014-04-03 Deutz Aktiengesellschaft Vorrichtung und Verfahren zur Abgasrückführung
EP2801709A1 (fr) 2013-05-08 2014-11-12 MAHLE Behr GmbH & Co. KG Refroidisseur de gaz d'échappement
FR3051843A1 (fr) * 2016-05-30 2017-12-01 Renault Sas Systeme de recirculation des gaz d'echappement pour un moteur a combustion interne d'un vehicule automobile

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FR2999241B1 (fr) * 2012-12-12 2017-02-17 Hypnow Dispositif de recyclage partiel a basse pression de gaz d'echappement d'un moteur, avec addition d'air puis catalyse
DE102014215559A1 (de) * 2014-08-06 2016-02-11 Mahle International Gmbh Kühler mit einem Flüssigkeitsabscheider
US10480460B2 (en) 2014-12-17 2019-11-19 Tenneco Gmbh EGR system with particle filter for a gasoline engine
DE102014118813A1 (de) 2014-12-17 2016-06-23 Tenneco Gmbh AGR-System mit Partikelfilter für Ottomotor
DE102020117724A1 (de) 2020-07-06 2022-01-13 Volkswagen Aktiengesellschaft Abgasnachbehandlungssystem sowie Verfahren zur Abgasnachbehandlung eines Verbrennungsmotors
DE102020208983A1 (de) 2020-07-17 2022-01-20 Volkswagen Aktiengesellschaft Brennkraftmaschine mit Abgasrückführleitung und Heizvorrichtung

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Cited By (5)

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Publication number Priority date Publication date Assignee Title
DE102012019240A1 (de) 2012-09-29 2014-04-03 Deutz Aktiengesellschaft Vorrichtung und Verfahren zur Abgasrückführung
WO2014048545A1 (fr) 2012-09-29 2014-04-03 Deutz Aktiengesellschaft Dispositif et procédé de recirculation des gaz d'échappement
EP2801709A1 (fr) 2013-05-08 2014-11-12 MAHLE Behr GmbH & Co. KG Refroidisseur de gaz d'échappement
DE102013208436A1 (de) 2013-05-08 2014-11-13 MAHLE Behr GmbH & Co. KG Abgaskühler
FR3051843A1 (fr) * 2016-05-30 2017-12-01 Renault Sas Systeme de recirculation des gaz d'echappement pour un moteur a combustion interne d'un vehicule automobile

Also Published As

Publication number Publication date
EP2625415A1 (fr) 2013-08-14
DE102010041982A1 (de) 2012-04-05

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