SE538192C2 - Exhaust gas recirculation system of an internal combustion engine and filter device for the system - Google Patents

Exhaust gas recirculation system of an internal combustion engine and filter device for the system Download PDF

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Publication number
SE538192C2
SE538192C2 SE1350005A SE1350005A SE538192C2 SE 538192 C2 SE538192 C2 SE 538192C2 SE 1350005 A SE1350005 A SE 1350005A SE 1350005 A SE1350005 A SE 1350005A SE 538192 C2 SE538192 C2 SE 538192C2
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Sweden
Prior art keywords
filter
filter device
combustion engine
internal combustion
exhaust
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SE1350005A
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Swedish (sv)
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SE1350005A1 (en
Inventor
Astrid Simovits
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Scania Cv Ab
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Priority to SE1350005A priority Critical patent/SE538192C2/en
Priority to PCT/SE2013/051530 priority patent/WO2014107130A1/en
Publication of SE1350005A1 publication Critical patent/SE1350005A1/en
Publication of SE538192C2 publication Critical patent/SE538192C2/en

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0002—Casings; Housings; Frame constructions
    • B01D46/0012—In-line filters
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/0217—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters the filtering elements having the form of hollow cylindrical bodies
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • F01N3/0226—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being fibrous
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
    • B01D2279/30—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for treatment of exhaust gases from IC Engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • 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
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/10—Fibrous material, e.g. mineral or metallic wool
    • 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
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

SAMMAN DRAG Uppfinningen avser ett system (100; 200; 300) for atercirkulation av avgaser hos en forbranningsmotor (2) samt en filteranordning (219; 319; 419; 519) for systemet. Systemet (100; 200; 300) innefattar en avgasledning (201; 301) som är anpassad att leda ut avgaser fran forbranningsmotorn (2), en returledning (211; 311) genonn vilken avgaser atercirkuleras fran avgasledningen (201; 301) till forbranningsnnotorn (2) och atnninstone en EGR-kylare (215; 315) som är anordnad i returledningen (211; 311), i vilken de atercirkulerande avgaserna kyls innan de leds till forbranningsnnotorn (2). Enligt uppfinningen är atminstone en filteranordning (219; 319; 419; 519) anordnad uppstroms om EGR-kylaren (215; 315) med avseende pa avgasernas stromningsriktning. Filteranordningen (219; 319; 419; 519) innefattar ett fiberfilter (421; 521) av kiseldioxidfibrer. Filtret är anpassat att filtrera partiklar Than avgasfloclet. Fiberfiltret (421; 521) är huvudsakligen pasformigt med en Open fOrsta ande (423; 523) och en sluten andra ande (425; 525). Uppfinningen avser aven en forbranningsmotor innefattande systemet och/eller filteranordningen samt ett fordon som innefattar forbranningsmotorn. Med hjalp av uppfinningen kan man minska nedsmutsning av EGR-kylaren. SUMMARY The invention relates to a system (100; 200; 300) for the recirculation of exhaust gases of an internal combustion engine (2) and a filter device (219; 319; 419; 519) for the system. The system (100; 200; 300) comprises an exhaust line (201; 301) adapted to discharge exhaust gases from the combustion engine (2), a return line (211; 311) through which exhaust gases are recirculated from the exhaust line (201; 301) to the combustion engine ( 2) and at least one EGR cooler (215; 315) arranged in the return line (211; 311), in which the recirculating exhaust gases are cooled before being led to the combustion engine (2). According to the invention, at least one filter device (219; 319; 419; 519) is arranged upstream of the EGR cooler (215; 315) with respect to the flow direction of the exhaust gases. The filter device (219; 319; 419; 519) comprises a fiber filter (421; 521) of silica fibers. The filter is adapted to filter particles Than exhaust fumes. The fiber filter (421; 521) is generally fit with an Open first spirit (423; 523) and a closed second spirit (425; 525). The invention also relates to an internal combustion engine comprising the system and / or the filter device as well as a vehicle comprising the internal combustion engine. With the help of the invention, contamination of the EGR cooler can be reduced.

Description

System f6r atercirkulation av avgaser hos en forbranningsmotor och filteranordning for systemet TEKNIKENS OMRADE Foreliggande uppfinning avser ett system f6r atercirkulation av avgaser hos en forbranningsmotor, en filteranordning for systemet, en forbranningsmotor innefattande systemet och/eller filteranordningen sannt ett fordon sonn innefattar forbranningsmotorn. BACKGROUND OF THE INVENTION The present invention relates to an exhaust gas recirculation system of an internal combustion engine, a filter device for the system, an internal combustion engine comprising the system and / or the filter device true to a vehicle comprising the internal combustion engine.

UPPFINNINGENS BAKGRUND OCH KAND TEKNIK Manga nnoderna forbranningsnnotorer har ett atercirkulationssystenn for avgaser, sa kallat EGR (Exhaust Gas Recirculation)-system. I ett EGRsystem leds en del av avgaserna tillbaka till motorn for att minska utslappen av kvaveoxider. De atercirkulerande avgaserna blandas med inloppsluften till fOrbranningsmotorn innan blandningen leds till fOrbranningsmotorns cylindrar. Tillsatsen av avgaser i inloppsluften ger en lagre syrehalt f6r inloppsluften och en lagre fOrbranningstemperatur, vilket bl.a. resulterar i en reducerad halt av kvavedioxider i avgaserna. BACKGROUND OF THE INVENTION AND KNOWLEDGE TECHNOLOGY Many node combustion engines have an exhaust gas recirculation system, so-called EGR (Exhaust Gas Recirculation) system. In an EGR system, some of the exhaust gases are led back to the engine to reduce emissions of nitrogen oxides. The recirculating exhaust gases are mixed with the inlet air to the internal combustion engine before the mixture is led to the cylinders of the internal combustion engine. The addition of exhaust gases in the inlet air gives a lower oxygen content for the inlet air and a lower combustion temperature, which i.a. results in a reduced content of nitrogen dioxide in the exhaust gases.

Forbranningsnnotorer kan innefattas i flera olika applikationer, till exennpel i tunga fordon, sasom lastbilar eller bussar. Fordonet kan alternativt vara en personbil. Aven motorbatar, fartyg, farjor eller skepp, industrimotorer och/eller motordrivna industrirobotar, kraftverk, sasom t.ex. ett elkraftverk som innefattar en dieselgenerator, lok eller annan applikation kan inbegripa en forbranningsmotor. Combustion engines can be included in several different applications, for example in heavy vehicles, such as trucks or buses. The vehicle can alternatively be a car. Also motor boats, ships, ferries or ships, industrial engines and / or motorized industrial robots, power plants, such as e.g. an electric power plant that includes a diesel generator, locomotive or other application may include an internal combustion engine.

Ett EGR-system innefattar atminstone en EGR-kylare vars syfte är att kyla avgaserna. Till exempel kan de atercirkulerande avgaserna kylas i en kylvatskekyld EGR-kylare och/eller i en luftkyld EGR-kylare. I en luftkyld 1 EGR-kylare kan de atercirkulerande avgaserna kylas till en temperatur som är i narheten av den omgivande luftens temperatur. An EGR system comprises at least one EGR cooler whose purpose is to cool the exhaust gases. For example, the recirculating exhaust gases can be cooled in a cooling water-cooled EGR cooler and / or in an air-cooled EGR cooler. In an air-cooled 1 EGR cooler, the recirculating exhaust gases can be cooled to a temperature that is close to the ambient air temperature.

En EGR-kylare kommer i kontakt med orenade avgaser direkt fran forbranningsmotorn och darfor är nedsmutsning av EGR-kylare ett stort problem. Avgaserna som leds genom en returledning tillbaka till motorn innehaller sotpartiklar som under passagen genom EGR-kylaren riskerar att avsattas pa EGR-kylarens varmeoverforande ytor sa att sotbelaggningar bildas. Sotpartiklar innehaller kol och kolvateinnehallande partiklar och partiklarna kan ha en klibbig yta. Sotbelaggningar pa EGR-kylarens varmeoverforande ytor forsamrar kylarens formaga att kyla avgaserna. En otillracklig kylning leder till ojamn motorprestanda. Sotbelaggningar kan aven satta igen avgasernas stromningspassager genom EGR-kylaren och darmed reduceras avgasflOdet genom returledningen. Detta kan leda till ett okat utslapp av emissioner fran forbranningsmotorn och till ett okat mottryck och darigenom forsamrad motorprestanda Den publicerade svenska patentansokan SE 0950427 Al visar ett arrangemang for atercirkulation av avgaser hos en forbranningsnnotor. Dokumentet visar ett arrangemang som har till syfte att minska problem med korrosion hos EGR-kylare. Korrosionen orsakas av svavelsyra i avgaserna. An EGR cooler comes into contact with untreated exhaust gases directly from the internal combustion engine and therefore contamination of the EGR cooler is a major problem. The exhaust gases that are led through a return line back to the engine contain soot particles which, during the passage through the EGR cooler, risk being deposited on the heat-transferring surfaces of the EGR cooler so that soot deposits form. Soot particles contain carbon and carbonaceous particles and the particles may have a sticky surface. Soot coatings on the heat transfer surfaces of the EGR cooler collect the cooler's ability to cool the exhaust gases. Insufficient cooling leads to uneven engine performance. Soot coatings can also clog the exhaust gas flow passages through the EGR cooler and thereby reduce the exhaust flow through the return line. This can lead to an increased emission of emissions from the internal combustion engine and to an increased back pressure and thereby reduced engine performance. The published Swedish patent application SE 0950427 A1 shows an arrangement for recirculation of exhaust gases in an internal combustion engine. The document shows an arrangement that aims to reduce corrosion problems in EGR coolers. Corrosion is caused by sulfuric acid in the exhaust gases.

Svavelsyran neutraliseras nedstroms om EGR-kylaren med hjalp av ett filter som innefattar basiskt material. I detta arrangemang hindras dock inte sotpartiklar fran att passera EGR-kylaren. The sulfuric acid is neutralized downstream of the EGR cooler by means of a filter containing basic material. In this arrangement, however, soot particles are not prevented from passing the EGR cooler.

SE 528878 02 visar ett annat arrangemang dar returledningen innefattar en styrd ventilanordning som mojliggor att ett relativt stort luft-flode med hog hastighet kan ledas att passera genom returledningen och EGR-kylaren sa att kylarens invandiga ytor rengors fran sotbelaggningar. Inte heller i detta arrangemang hindras sotpartiklarna fran att passera EGR-kylaren. SE 528878 02 shows another arrangement where the return line comprises a controlled valve device which enables a relatively large air flow at high speed to be led to pass through the return line and the EGR cooler said that the inner surfaces of the cooler are cleaned of soot coatings. Also in this arrangement, the soot particles are not prevented from passing the EGR cooler.

Det finns fortfarande behov av en enkel losning att minska nedsmutsning av EGR-kylare. Sarskilt finns det ett stort behov av att minska mangden 2 sotpartiklar som kommer i kontakt med EGR-kylaren sa att forsamrad kylprestanda kan forebyggas och minimeras. There is still a need for a simple solution to reduce contamination of EGR coolers. In particular, there is a great need to reduce the amount of 2 soot particles that come into contact with the EGR cooler so that accumulated cooling performance can be prevented and minimized.

SAMMANFATTNING AV UPPFINNINGEN Syftet med fOreliggande uppfinning är att minska nedsmutsning av EGR- kylare i ett atercirkulationssystem av avgaser hos en forbranningsmotor. SUMMARY OF THE INVENTION The object of the present invention is to reduce fouling of EGR coolers in an exhaust gas recirculation system of an internal combustion engine.

Speciellt är det ett syfte med uppfinningen att minska antalet sotpartiklar i avgasflodet som leds in i EGR-kylaren. In particular, it is an object of the invention to reduce the number of soot particles in the exhaust stream which is led into the EGR cooler.

Det är ett vidare syfte med uppfinningen att rengora avgasflodet utan att motorprestanda paverkas vasentligt. It is a further object of the invention to clean the exhaust stream without significantly affecting engine performance.

Det är ett ytterligare syfte med uppfinningen att tillhandahalla en filteranordning som kan anpassas till tranga utrymmen. It is a further object of the invention to provide a filter device which can be adapted to tight spaces.

Dessa syften uppnas med ett system som definieras i patentkrav 1 och en filteranordning som definieras i patentkrav 10. These objects are achieved with a system as defined in claim 1 and a filter device as defined in claim 10.

Enligt en forsta aspekt avser uppfinningen ett system for atercirkulation av avgaser hos en forbranningsmotor. Systemet innefattar en avgasledning som är anpassad att leda ut avgaser tan forbranningsmotorn, en returledning genom vilken avgaser atercirkuleras fran avgasledningen till forbranningsmotorn och atminstone en EGR-kylare som är anordnad i returledningen. De atercirkulerande avgaserna kyls i EGR-kylaren innan de leds till forbranningsmotorn. For att hindra sotpartiklar fran att passera genom EGR-kylaren, anordnas atminstone en filteranordning uppstroms om EGRkylaren med avseende pa avgasernas stromningsriktning. Filteranordningen innefattar ett fiber-filter av kiseldioxidfibrer, vilket filter är anpassat att filtrera partiklar Than avgasfloclet. Fiberfiltret är foretradesvis huvudsakligen pasformigt med en Open forsta ande och en sluten andra ande. According to a first aspect, the invention relates to a system for recirculating exhaust gases of an internal combustion engine. The system comprises an exhaust line adapted to discharge exhaust gases to the internal combustion engine, a return line through which exhaust gases are recirculated from the exhaust line to the internal combustion engine and at least one EGR cooler arranged in the return line. The recirculating exhaust gases are cooled in the EGR cooler before being fed to the internal combustion engine. In order to prevent soot particles from passing through the EGR cooler, at least one filter device is arranged upstream of the EGR cooler with respect to the flow direction of the exhaust gases. The filter device comprises a fiber filter of silica fibers, which filter is adapted to filter particles Than the exhaust gas floc. The fiber filter is preferably substantially fit with an Open first spirit and a closed second spirit.

Genom att anordna filteranordningen uppstroms om EGR-kylaren i systemet filtreras sotpartiklarna bort atnninstone delvis innan avgasflodet passerar EGR-kylaren. Darigenom kan nedsmutsningen av EGR-kylaren minskas. 3 Enligt en annan aspekt avser uppfinningen en filteranordning for systemet. Pa motsvarande satt som beskrivs ovan i samband med systemet innefattar filteranordningen ett fiberfilter av kiseldioxidfibrer, vilket filter är anpassat att filtrera partiklar Than avgasflOdet. Fiberfiltret är huvudsakligen pasformigt med en Open forsta ande och en sluten andra ande. Genom att forma filtret som en pase kan ytan pa filtret okas pa ett enkelt satt. Desto storre yta filtret har, desto battre filtreringsgrad kan uppnas. By arranging the filter device upstream of the EGR cooler in the system, the soot particles are filtered out at least partially before the exhaust gas flow passes the EGR cooler. This can reduce the contamination of the EGR cooler. According to another aspect, the invention relates to a filter device for the system. In the manner described above in connection with the system, the filter device comprises a fiber filter of silica fibers, which filter is adapted to filter particles Than the exhaust gas flow. The fiber filter is mainly fit with an Open first spirit and a closed second spirit. By shaping the filter as a pass, the surface of the filter can be increased in a simple way. The larger the surface area of the filter, the better the degree of filtration can be achieved.

Fiberfilter har manga fordelar. De är flexibla och kan latt anpassas till tranga utrymmen. Fiberfilter är enkla att tillverka och kan fornnas till exempel genonn formpressning till en onskad form varvid anpassningen till tranga utrymmen ytterligare forbattras. Fiberfilter innefattar ett stort antal fibrer, varvid en stor effektiv yta tillhandahalls for att ta emot och fanga sotpartiklar, som kan fangas i hoptrasslade fibrer och/eller klibba fast pa fibrernas yta. Darigenom kan en h6g reningsgrad uppnas. Fiber filters have many benefits. They are flexible and can be easily adapted to tight spaces. Fiber filters are easy to manufacture and can be formed, for example, by compression molding into a desired shape, whereby the adaptation to narrow spaces is further improved. Fiber filters comprise a large number of fibers, a large effective surface being provided for receiving and trapping soot particles, which can be trapped in tangled fibers and / or stick to the surface of the fibers. As a result, a high degree of purification can be achieved.

Uppfinningen avser aven en forbranningsmotor som innefattar ett system och/eller en filteranordning enligt ovan och ett fordon som innefattar forbranningsnnotorn. The invention also relates to an internal combustion engine comprising a system and / or a filter device as above and a vehicle comprising the internal combustion engine.

Ytterligare sardrag, syften och fOrdelar framgar av den fOljande detaljerade beskrivningen. Additional features, objects, and advantages will be apparent from the following detailed description.

KORT BESKRIVNING AV RITNINGARNA Figur 1 visar schematiskt en sidovy av en lastbil som innefattar ett atercirkulationssystem f6r avgaser. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 schematically shows a side view of a truck which includes an exhaust gas recirculation system.

Figur 2 visar schematiskt ett atercirkulationssystem for avgaser enligt en utfOringsform av uppfinningen. Figure 2 schematically shows an exhaust gas recirculation system according to an embodiment of the invention.

Figur 3 visar schematiskt ett atercirkulationssystem for avgaser enligt en alternativ utforingsform av uppfinningen. Figure 3 schematically shows an exhaust gas recirculation system according to an alternative embodiment of the invention.

Figur 4 visar schematiskt en sidovy av en filteranordning enligt en utfOringsform av uppfinningen. 4 Figur 5 visar schennatiskt ett tvarsnitt av en filteranordning enligt en alternativ utforingsform av uppfinningen. Figure 4 schematically shows a side view of a filter device according to an embodiment of the invention. Figure 5 schematically shows a cross section of a filter device according to an alternative embodiment of the invention.

DETALJERAD BESKRIVNING Ett system for atercirkulation av avgaser hos en forbranningsmotor innefattar atminstone en EGR-kylare. En EGR-kylare är en anordning som är inrattad att kyla avgaserna med till exempel kylvatska eller luft. DETAILED DESCRIPTION A system for exhaust gas recirculation of an internal combustion engine comprises at least one EGR cooler. An EGR cooler is a device that is designed to cool the exhaust gases with, for example, cooling water or air.

Det finns inga krav for partikelfiltrering i ett EGR-system, eftersom avgaserna som passerar EGR-systemet och forbranningsmotorn leds vidare till ytterligare avgasrening. Avgasreningen kan ske till exempel i en ljuddampare som innefattar anordningar for avgasrening. I ett atercirkulationssystenn är en partikelfiltreringsgrad pa ca 60-80% godtagbar, varvid EGR-kylaren kan atminstone delvis skyddas fran nedsmutsningen. Filtreringsgraden kan forstas vara annu hogre. There are no requirements for particle filtration in an EGR system, as the exhaust gases that pass the EGR system and the internal combustion engine are passed on to further exhaust gas purification. The exhaust gas purification can take place, for example, in a muffler which includes devices for exhaust gas purification. In a recirculation system, a degree of particle filtration of about 60-80% is acceptable, whereby the EGR cooler can be at least partially protected from contamination. The degree of filtration can of course be even higher.

Filteranordningen enligt uppfinningen innefattar ett fiberfilter som tillverkas huvudsakligen av kiseldioxidfibrer som är varmetaliga och aven taliga mot olika kemikalier. Darfor passar de utmarkt till att anvandas i samband med forbranningsmotorer. Eftersom kiseldioxidfibrerna tal hoga temperaturer kan de fangade och/eller fastklibbade sotpartiklarna i fiberfiltret forbrannas spontant eller styrt och filtret kan darigenom regenereras. The filter device according to the invention comprises a fiber filter which is manufactured mainly of silica fibers which are thermally metallic and also resistant to various chemicals. Therefore, they are excellent for use in connection with internal combustion engines. Since the silica fibers speak at high temperatures, the trapped and / or stuck soot particles in the fiber filter can be burned spontaneously or in a controlled manner and the filter can thereby be regenerated.

Kiseldioxidfibrerna är foretradesvis av ren kiseldioxid. Ett exempel pa fibermaterial av denna typ levereras av f6retaget Saint Gobain Quartz, till exempel under ett varumarke Quartzel® Wool. The silica fibers are preferably of pure silica. An example of fibrous material of this type is supplied by the company Saint Gobain Quartz, for example under a brand name Quartzel® Wool.

Fibrerna i fiberfiltret kan aven belaggas med ett katalytiskt material for att kunna branna bort partiklar kontinuerligt vid relativt laga temperaturer fran 200°C till 250 °C. Det katalytiska materialet kan till exempel vara en adelmetall, till exempel vanadin, rodiunn och/eller palladium, eller nagot annat katalytiskt material. The fibers in the fiber filter can also be coated with a catalytic material in order to be able to burn off particles continuously at relatively low temperatures from 200 ° C to 250 ° C. The catalytic material may be, for example, a noble metal, for example vanadium, rhodium and / or palladium, or some other catalytic material.

Kiseldioxidfibrerna packas fOr att forma ett fiberfilter. Med packning menas att fibrerna, som ofta levereras som en fibermatta i vilken kiseldioxidfibrerna är slumpmassigt ordnade , komprimeras till exempel pa mekaniskt vis till en onskad volym och/eller form. Filtret kan aven formas med formpressning. The silica fibers are packed to form a fiber filter. By packing is meant that the fibers, which are often supplied as a fiber mat in which the silica fibers are arranged randomly, are compressed, for example, mechanically to a desired volume and / or shape. The filter can also be formed by compression molding.

Fibrerna i filtret är slumpvis trasslade och bildar ett nat och sotpartiklar, som kan ha en klibbig yta, kan darigenom bade fastna pa kiseldioxidfibrernas yta och bli fangade i det bildade fibernatet. Fibrerna är ocksa formbara och kan anta nastan vilken form som heist och kan darigenom anpassas till olika applikationer. Dessutom kan fiberfiltret folja rorkrokningar och är darfor anvandbart aven i sadana system som innehaller r6rkr6kningar. The fibers in the filter are randomly entangled and form a seam and soot particles, which may have a sticky surface, can thereby both adhere to the surface of the silica fibers and become trapped in the formed fiber net. The fibers are also malleable and can assume almost any shape and can thus be adapted to different applications. In addition, the fiber filter can follow pipe hooks and is therefore usable even in such systems which contain pipe hooks.

For att fa en sa hog filtreringsgrad som mojligt hos ett fiberfilter bor fiberfiltrets yta maximeras och detta gors enligt uppfinningen genom att forma filtret som en pase, varvid en relativt stor filtreringsyta erhalls. Till exempel i en typ av ett EGR-system kan filtret vara vasentligen cirkularcylindriskt och ha en yttre diameter pa 100 mm och en langd pa ca 500 mm. Detta skulle ge en yttre yta pa ca 0,15 m2. Ytan pa filtret kan varieras till exempel mellan 0,1 och 0,3 m2, beroende pa utrymmet i avgassystemet. In order to obtain as high a degree of filtration as possible with a fiber filter, the surface of the fiber filter should be maximized and this is done according to the invention by forming the filter as a pass, whereby a relatively large filtration surface is obtained. For example, in a type of EGR system, the filter may be substantially circular-cylindrical and have an outer diameter of 100 mm and a length of about 500 mm. This would give an external area of about 0.15 m2. The surface of the filter can be varied, for example, between 0.1 and 0.3 m2, depending on the space in the exhaust system.

For all vidare nnaxinnera den effektiva ytan har fibrerna foretradesvis en diameter pa cirka 7-10 pm. For all further nanaxinnera the effective surface, the fibers preferably have a diameter of about 7-10 μm.

Filtrets tjocklek paverkar ocksa filtrets filtreringsgrad. Vaggtjockleken av filtret beror pa utrymmet for filtret, luftfloden i det aktuella systemet och vilken reningsgrad 6nskas, men kan variera mellan 10-30 mm och ar foretradesvis mellan 15 och 20 mm. The thickness of the filter also affects the degree of filtration of the filter. The rock thickness of the filter depends on the space of the filter, the air flow in the system in question and the degree of purification desired, but can vary between 10-30 mm and is preferably between 15 and 20 mm.

En ytterligare parameter som paverkar filtreringsgraden är fiberfiltrets porositet. Porositeten definierar hur mycket luft fiberfiltret innefattar och porositeten paverkas av hur fibrerna i filtret är packade. Desto mera fibrerna packas, desto lagre blir porositeten, dvs. desto mindre luft filtret innefattar. Porositeten är foretradesvis sa hog som mojligt, till exempel mellan 92-96%, sa att mottrycket i systemet inte blir for hogt. Om porositeten är Over 96 "Yo 6 akar risken att filtret komprimeras av avgasflodet. Fiberfiltret kan ha en porositet mellan 92-96% sa att mottrycket i systemet kan hallas pa en godtag bar niva. An additional parameter that affects the degree of filtration is the porosity of the fiber filter. The porosity defines how much air the fiber filter contains and the porosity is affected by how the fibers in the filter are packed. The more the fibers are packed, the lower the porosity, ie. the less air the filter includes. The porosity is preferably as high as possible, for example between 92-96%, so that the back pressure in the system does not become too high. If the porosity is Over 96 "Yo 6, there is a risk that the filter will be compressed by the exhaust stream. The fiber filter can have a porosity between 92-96% so that the back pressure in the system can be kept at an acceptable level.

Avgasflodet i EGR-systemet, dvs. EGR-flodet, kan variera mellan ca 100-500 m3/h. Vid store floden kan filtret komprimeras under driften. The exhaust flow in the EGR system, ie. The EGR river, can vary between about 100-500 m3 / h. At large rivers, the filter can be compressed during operation.

Det pasformiga fiberfiltrets oppna forsta ande har fOretradesvis ett tvarsnitt som motsvarar avgasledningens och/eller returledningens tvarsnitt och kan ha till exempel ett cirkulart tvarsnitt. Detta underlattar montering av filtret i standardledningar i en onskad position. Den oppna anden kan aven forses med en flans eller motsvarande. Flansen kan tillhandahallas med monteringselement for att ytterligare underlatta montering och demontering av filteranordningen i en ledning. Flansens storlek och form motsvarar ledningens, till exempel avgasledningens och/eller returledningens, form och storlek. The open front end of the fit fiber filter preferably has a cross section corresponding to the cross section of the exhaust line and / or the return line and may have, for example, a circular cross section. This facilitates mounting of the filter in standard wires in a desired position. The open duck can also be provided with a flange or equivalent. The flange can be provided with mounting elements to further facilitate mounting and disassembly of the filter device in a conduit. The size and shape of the flange correspond to the shape and size of the line, for example the exhaust line and / or the return line.

Fiberfiltret kan omges av ett metallnat. Metallnatet ger stadga och stabilitet till filtret. The fiber filter can be surrounded by a metal mesh. The metal mesh gives stability and stability to the filter.

Filteranordningen kan anordnas i atercirkulationssystemets returledning. Denna utforingsfornn är anvandbar till exempel i ett sa kallat kort EGR-system, dar avgasen leds ut fore en turbin och leds tillbaka in efter en kompressor. The filter device can be arranged in the return line of the recirculation system. This embodiment is usable, for example, in a so-called short EGR system, where the exhaust gas is led out in front of a turbine and led back in after a compressor.

Filteranordningen kan aven anordnas i avgasledningen. Denna utf6ringsform är anvandbar till exempel i ett sa kallat langt EGR-system, dar avgasen leds ut efter turbinen och leds in fore kompressorn. The filter device can also be arranged in the exhaust line. This embodiment is usable, for example, in a so-called long EGR system, where the exhaust gas is led out after the turbine and led in before the compressor.

Principen av respektive system visas i Figur 2 och Figur 3. The principle of each system is shown in Figure 2 and Figure 3.

Uppfinningen avser aven en forbranningsmotor som innefattar ett atercirkulationssystem och/eller en filteranordning enligt nagon av de ovan beskrivna utforingsformerna samt ett fordon som innefattar forbranningsmotorn.. The invention also relates to an internal combustion engine which comprises a recirculation system and / or a filter device according to any one of the embodiments described above and a vehicle which comprises the internal combustion engine.

Uppfinningen beskrivs nedan med vidare hanvisning till Figurerna 1-5. 7 Figur 1 visar ett fordon 1 i en schematisk sidovy. Fordonet 1 är forsett med en forbranningsmotor 2, som driver fordonets 1 drivhjul 4 via en vaxellada 6 och en kardanaxel 8. Forbranningsmotorn 2 är forsedd med ett avgassystem 10 i vilket en ljuddampare 12 är anordnad. Forbranningsmotorn 2 drivs av ett bransle 14, som frammatas till forbranningsmotorn 2 med ett branslesystem 16 innefattande en bransletank 18. Ett atercirkulationssystem (EGR-system) 100 fOr avgaser är anordnat vid fOrbranningsmotorn 2. The invention is described below with further reference to Figures 1-5. Figure 1 shows a vehicle 1 in a schematic side view. The vehicle 1 is provided with an internal combustion engine 2, which drives the drive wheel 4 of the vehicle 1 via a gearbox 6 and a propeller shaft 8. The internal combustion engine 2 is provided with an exhaust system 10 in which a muffler 12 is arranged. The internal combustion engine 2 is driven by a fuel 14, which is fed to the internal combustion engine 2 by a fuel system 16 comprising a fuel tank 18. An exhaust gas recirculation system (EGR system) 100 is provided at the internal combustion engine 2.

I Figur 2 visas forenklat ett atercirkulationssystem (EGR-system) 200 for avgaser. EGR-systennet är ett sá kallat kort EGR-system. I systennet 200 leds avgaser fran forbranningsmotorns 2 cylindrar 2a, 2b, 2c, 2d, 2e, 2f (2a-2f) via en avgassamlare (inte visad) till en avgasledning 201. Avgaserna leds sedan genom en turbin 203, som erhaller en drivkraft som overfors via en fOrbindning till en kompressor 205. Kompressorn 205 kan darmed komprimera luft som leds via en inloppsledning 207 till forbranningsmotorn 2. Figure 2 simply shows a recirculation system (EGR system) 200 for exhaust gases. The EGR system is a so-called short EGR system. In the system 200, exhaust gases from the cylinders 2a, 2b, 2c, 2d, 2e, 2f (2a-2f) of the internal combustion engine 2 are led via an exhaust collector (not shown) to an exhaust line 201. The exhaust gases are then passed through a turbine 203, which obtains a driving force transmitted via a connection to a compressor 205. The compressor 205 can thus compress air which is led via an inlet line 207 to the internal combustion engine 2.

Inloppsledningen 207 innefattar en laddluftskylare 209 kir aft kyla den komprimerade luften innan den leds till forbranningsmotorns 2 respektive cylinder 2a-2f via en fOrgrening (inte visad). The inlet line 207 comprises a charge air cooler 209 which cools the compressed air before it is led to the internal combustion engine 2 and cylinder 2a-2f, respectively, via a branch (not shown).

Systemet innefattar vidare en returledning 211 som har till uppgift aft atercirkulera en del av avgaserna fran avgasledningen 201. Returledningen 211 innefattar en ventilanordning 213 kopplad till en elektrisk styrenhet (inte visad), som styr ventilanordningen 213 pa ett onskat satt under forbranningsmotorns 2 drift. Returledningen innefattar en EGR-kylare 215 och en EGR-blandare 217 medelst vilken de atercirkulerade avgaserna kan blandas med den konnprimerade luften i inloppsledningen 207. I den utfOringsform som visas i Figur 2 innefattar returledningen 211 en filteranordning 219 uppstroms om, dvs. fore EGR-kylaren 215. The system further comprises a return line 211 which has the task of recirculating a part of the exhaust gases from the exhaust line 201. The return line 211 comprises a valve device 213 connected to an electric control unit (not shown), which controls the valve device 213 in a desired manner during operation of the internal combustion engine 2. The return line comprises an EGR cooler 215 and an EGR mixer 217 by means of which the recirculated exhaust gases can be mixed with the compressed air in the inlet line 207. In the embodiment shown in Figure 2, the return line 211 comprises a filter device 219 upstream of, i.e. for the EGR cooler 215.

I Figur 3 visas en annan utforingsfornn av systennet enligt uppfinningen, ett sa kallat langt EGR-system 300. I systemet 300 leds avgaser fran forbranningsmotorns 2 cylindrar 2a, 2b, 2c, 2d, 2e, 2f (2a-2f) via en avgassamlare (inte visad) till en avgasledning 301. Avgaserna leds sedan 8 genom en turbin 303, som erhaller en drivkraft och som overfors via en forbindning 304 till en kompressor 305. Kompressorn 305 kan darmed komprimera luftflOdet fran inloppet 306 som leds in via en inloppsledning 307. Luffflodet som passerar genom inloppet 306 styrs med hjalp av en inloppsventil 308 som reglerar intagning av luft via ett inlopp 306 till forbranningsmotorn 2. Inloppsledningen 307 innefattar en laddluftskylare 309 fOr att kyla den komprimerade luften innan den leds till fOrbranningsmotorns 2 respektive cylinder 2a-2f via en forgrening (inte visad). Figure 3 shows another embodiment of the system according to the invention, a so-called long EGR system 300. In the system 300, exhaust gases from the combustion engine cylinders 2a, 2b, 2c, 2d, 2e, 2f (2a-2f) are led via an exhaust collector ( not shown) to an exhaust line 301. The exhaust gases are then led 8 through a turbine 303, which receives a driving force and which is transmitted via a connection 304 to a compressor 305. The compressor 305 can thereby compress the air flow from the inlet 306 which is led in via an inlet line 307. The air flow passing through the inlet 306 is controlled by means of an inlet valve 308 which regulates the intake of air via an inlet 306 to the internal combustion engine 2. The inlet line 307 comprises a charge air cooler 309 for cooling the compressed air before it is led to the internal combustion engine 2 a branch (not shown).

Systemet innefattar vidare en returledning 311 som har till uppgift att atercirkulera en del av avgaserna fran avgasledningen 301. En ventilanordning 317 är anordnad mellan avgasledningen 301 och returledningen 311 for att styra vilken del av avgaserna atercirkuleras och vilken del leds ut ur systemet. Den delen av avgaserna som inte cirkuleras leds ut ur atercirkulationssystemet via ventilanordningen 317. Detta visas i Figur 3 med hjalp av en pil till hOger om ventilanordningen 317. Vidare i den utf6ringsform som visas i Figur 3 innefattas filteranordningen 319 i avgasledningen 301 uppstroms om EGR-kylaren 315. The system further comprises a return line 311 which has the task of recirculating a part of the exhaust gases from the exhaust line 301. A valve device 317 is arranged between the exhaust line 301 and the return line 311 to control which part of the exhaust gases is recirculated and which part is led out of the system. The part of the exhaust gases which is not circulated is led out of the recirculation system via the valve device 317. This is shown in Figure 3 by means of an arrow to the right of the valve device 317. Further in the embodiment shown in Figure 3 the filter device 319 is included in the exhaust line 301 upstream of the EGR. the cooler 315.

Filteranordningen enligt en utforingsform av uppfinningen visas i Figur 4. Filteranordningen 419 innefattar ett fiberfilter 421. Fiberfiltret 421 är anpassat att filtrera partiklar fran avgasflodet genom att partiklarna fastnar i fiberfiltrets fibrer. Fiberfiltret 421 i filteranordningen 419 är huvudsakligen pasformigt och har en 6ppen f6rsta ande 423 och en sluten andra ande 425. Fiberfiltret är omgivet av ett metallnat 427. Avgaserna flOdar in genom filteranordningens 419 oppna ande 423 och ut genom den slutna andra anden 425. The filter device according to an embodiment of the invention is shown in Figure 4. The filter device 419 comprises a fiber filter 421. The fiber filter 421 is adapted to filter particles from the exhaust stream by the particles getting stuck in the fibers of the fiber filter. The fiber filter 421 in the filter device 419 is substantially fit and has an open first end 423 and a closed second end 425. The fiber filter is surrounded by a metal mesh 427. The exhaust gases flow in through the open end 423 of the filter device 419 and out through the closed second end 425.

Filteranordningen 419 kan vidare innefatta en flans 431 omkring fiberfiltrets 421 oppna ande 423. Flansen 431 underlattar montering av filteranordningen 419 i en onskad position i en ledning i atercirkulationssystemet enligt uppfinningen. Flansens storlek och form motsvarar ledningens storlek och form. 9 I Figur 5 visas i tvarsnitt en annan utforingsform av en filteranordning 519. Filteranordningen innefattar ett fiberfilter 521. Fiberfiltret 521 är pasformigt och har en oppen forsta ande 523 och en sluten andra ande 525. Sotpartiklarna kan fastna pa hela filtrets relativt stora yta som inkluderar fiberfiltrets 521 inre yta 526 och aven delvis den inre volymen. Fiberfiltret 521 har aven en yttre yta 528. Nar man viii uppna en hog filtreringsgrad, [Dor partiklarna inte migrera genom hela filtret aven till den yttre ytan 528, utan partiklarna b6r fastna pa filtrets inre yta och i den invandiga volymen. Nar en lagre filtreringsgrad pa ca 60-80% är godtagbar, kan en del av partiklarna migrera genom filtret. The filter device 419 may further comprise a flange 431 around the open end 233 of the fiber filter 421. The flange 431 facilitates mounting of the filter device 419 in a desired position in a conduit in the recirculation system according to the invention. The size and shape of the flange correspond to the size and shape of the pipe. Figure 5 shows in cross section another embodiment of a filter device 519. The filter device comprises a fiber filter 521. The fiber filter 521 is fit and has an open first end 523 and a closed second end 525. The soot particles can adhere to the relatively large surface of the entire filter which includes the inner surface 526 of the fiber filter 521 and also partly the inner volume. The fiber filter 521 also has an outer surface 528. When a high degree of filtration is to be achieved, the particles do not migrate through the entire filter to the outer surface 528, but the particles should stick to the inner surface of the filter and to the internal volume. When a lower filtration rate of about 60-80% is acceptable, some of the particles may migrate through the filter.

Avgasema flodar in genom filteranordningens 519 Oppna ande 523 och ut genom den slutna andra anden 525. Filteranordningen 519 innefattar aven ett rOrformigt vaggelement 533 som är forsett med flansar 531, 531' eller liknande pa sina andar. Flansen 531 omger fiberfiltrets 521 6ppna ande 523 och flansen 531' placeras vid fiberfiltrets slutna ande 525. Flansarna 531 och 531' kan innefatta monteringselement sasom skruvar eller motsvarande. Flansarna underlattar montering av filteranordningen 519 i en onskad position i en ledning i atercirkulationssystemet enligt uppfinningen och flansarna har en storlek och form motsvarar ledningens tvarsnitt. The exhaust gases flow in through the open end 523 of the filter device 519 and out through the closed second spirit 525. The filter device 519 also comprises a tubular rocker element 533 which is provided with flanges 531, 531 'or the like on its spirits. The flange 531 surrounds the open end 523 of the fiber filter 521 6 and the flange 531 'is placed at the closed end 525 of the fiber filter. The flanges 531 and 531' may comprise mounting elements such as screws or the like. The flanges facilitate mounting of the filter device 519 in a desired position in a conduit in the recirculation system according to the invention and the flanges have a size and shape corresponding to the cross section of the conduit.

Filteranordningen med ett fiberfilter som beskrivits ovan är lamplig for att anvandas i flera olika EGR-system. Ett exempel pa ett system är ett system med ett EGR-flode pa 100 — 300 m3/h. Dessa EGR-floden finns framf6r alit pa mindre motorer, dvs. motorer med en cylindervolym pa under 10 dm3, speciellt under sa kallad bussdrift. The filter device with a fiber filter described above is suitable for use in several different EGR systems. An example of a system is a system with an EGR flow of 100 - 300 m3 / h. These EGR rivers are mainly found on smaller engines, ie. engines with a cylinder volume of less than 10 dm3, especially during so-called bus operation.

I ett system som har ett EGR-flode pa 100 — 300 m3/h, kan ytan av fiberfiltret vara ca 0,15 m2, vilket innebar att filtret har en yttre diameter pa ca 100 mm och en langd pa ca 500 mm. Tjockleken kan vara ca 15 mm for att uppna en filtreringsgrad av sotpartiklar pa ca 60-80%. Fiberfiltrets porositet kan vara ca 92-96%. Med dessa dimensioner uppnar man en filtreringsgrad pa ca 60- 80%, mottrycket i systemet blir godtagbart och prestanda stors inte. In a system that has an EGR flow of 100 - 300 m3 / h, the surface of the fiber filter can be about 0.15 m2, which means that the filter has an outer diameter of about 100 mm and a length of about 500 mm. The thickness can be about 15 mm to achieve a filtration degree of soot particles of about 60-80%. The porosity of the fiber filter can be about 92-96%. With these dimensions, a degree of filtration of about 60-80% is achieved, the back pressure in the system becomes acceptable and performance is not increased.

De ovan angivna exemplen och utf6ringsformerna är uppfinningen, utan uppfinningen kan varieras fritt inom p 11 forbranningsmotorns inte begransande f6r )atentkravens ramar. The above examples and embodiments are the invention, but the invention can be varied freely within the scope of the non-limiting internal combustion engine.

Claims (17)

PATE NTKRAVPATE NTKRAV 1. System (100; 200; 300) fOr atercirkulation av avgaser hos en forbranningsmotor (2), varvid systemet (100; 200; 300) innefattar en avgasledning (201; 301) som ar anpassad all leda ut avgaser fran forbranningsmotorn (2), en returledning (211; 311) genom vilken avgaser atercirkuleras fran avgasledningen (201; 301) till forbranningsmotorn (2) och atminstone en EGR-kylare (215; 315) som är anordnad i returledningen (211; 311), i vilken de atercirkulerande avgaserna kyls innan de leds till forbranningsmotorn (2), varvid atminstone en filteranordning (219; 319; 419; 519) är anordnad uppstroms cm EGR-kylaren (215; 315) med avseende pa avgasernas stromningsriktning, kannetecknat av att filteranordning (219; 319; 419; 519) innefattar ett fiberfilter (421; 521) av kiseldioxidfibrer, vilka kiseldioxidfibrer är slumpvis trasslade och bildar ett nat, varvid fiberfiltret är anpassat att filtrera partiklar fran avgasflodet genom att partiklarna fastnar bade pa kiseldioxidfibrernas yta och bli fangade i det bildade fibernatet.A system (100; 200; 300) for exhaust gas recirculation of an internal combustion engine (2), the system (100; 200; 300) comprising an exhaust line (201; 301) adapted to discharge all exhaust gases from the internal combustion engine (2). , a return line (211; 311) through which exhaust gases are recirculated from the exhaust line (201; 301) to the internal combustion engine (2) and at least one EGR cooler (215; 315) arranged in the return line (211; 311), in which the recirculating the exhaust gases are cooled before being led to the internal combustion engine (2), at least one filter device (219; 319; 419; 519) being arranged upstream of the EGR cooler (215; 315) with respect to the flow direction of the exhaust gases, characterized in that filter device (219; 319 ; 419; 519) comprises a fiber filter (421; 521) of silica fibers, which silica fibers are randomly entangled and form a night, the fiber filter being adapted to filter particles from the exhaust stream by the particles adhering both to the surface of the silica fibers and being trapped those in the formed fiber net. 2. System enligt krav 1, kannetecknat av att fiberfiltret (421; 521) i filteranordningen (219; 319; 419; 519) ar huvudsakligen pasformigt och har en oppen f6rsta ande (423; 523) och en andra sluten ande (425; 525).System according to claim 1, characterized in that the fiber filter (421; 521) in the filter device (219; 319; 419; 519) is substantially fit and has an open first spirit (423; 523) and a second closed spirit (425; 525). ). 3. System enligt krav 1 eller 2, kannetecknat av att kiseldioxidfibrerna är belagda med ett katalytiskt material, sasom adelmetall.System according to claim 1 or 2, characterized in that the silica fibers are coated with a catalytic material, such as noble metal. 4. System enligt krav 1, 2 eller 3, kannetecknat av att fibrerna har en diameter pa cirka 7-10 pm.A system according to claim 1, 2 or 3, characterized in that the fibers have a diameter of about 7-10 μm. 5. System enligt krav 1-4, kannetecknat av att fiberfiltrets (421; 521) Oppna forsta ande (423; 523) har ett tvarsnitt som motsvarar avgasledningens och/eller returledningens tvarsnitt.System according to claims 1-4, characterized in that the open first end of the fiber filter (421; 521) (423; 523) has a cross section corresponding to the cross section of the exhaust line and / or the return line. 6. System enligt nagot av foregaende patentkrav, kannetecknat av att fiberfiltret (421; 521) omges av ett metallnat (427). 12A system according to any one of the preceding claims, characterized in that the fiber filter (421; 521) is surrounded by a metal mesh (427). 12 7. System enligt nagot av foregaende patentkrav, kannetecknat av att filteranordningen (219; 319; 419; 519) innefattar atminstone en flans (431; 531; 531') med monteringselement, vilken flans (431; 531; 531') omger fiberfiltrets (421; 521) oppna forsta ande (423; 523) och har en form och storlek som motsvarar avgasledningens och/eller returledningens form och storlek.A system according to any one of the preceding claims, characterized in that the filter device (219; 319; 419; 519) comprises at least one flange (431; 531; 531 ') with mounting elements, which flange (431; 531; 531') surrounds the fiber filter ( 421; 521) open first spirit (423; 523) and have a shape and size corresponding to the shape and size of the exhaust line and / or return line. 8. System enligt nagot av foregaende patentkrav, kannetecknat av att filteranordningen (219; 319; 419; 519) är anordnad i returledningen (211; 311).A system according to any one of the preceding claims, characterized in that the filter device (219; 319; 419; 519) is arranged in the return line (211; 311). 9. System enligt nagot av patentkrav 1-7, kannetecknat av all filteranordningen är anordnad i avgasledningen (201; 301).A system according to any one of claims 1-7, characterized in that all the filter device is arranged in the exhaust line (201; 301). 10. Filteranordning (219; 319; 419; 519) for ett system (100; 200; 300) enligt nagot av krav 1-9 kannetecknad av att filteranordningen (219; 319; 419; 519) innefattar ett fiberfilter (421; 521) av kiseldioxidfibrer, vilka kiseldioxidfibrer ãr slumpvis trasslade och bildar ett nat, vilket filter är anpassat all filtrera partiklar fran avgasflodet genom all partiklama fastnar bade pa kiseldioxidfibremas yta och bli fangade i det bildade fibernatet, varvid fiberfiltret (421; 521) är huvudsakligen pasformigt med en Open forsta ande (423; 523) och en sluten andra ande (425; 525).A filter device (219; 319; 419; 519) for a system (100; 200; 300) according to any one of claims 1-9, characterized in that the filter device (219; 319; 419; 519) comprises a fiber filter (421; 521) of silica fibers, which silica fibers are randomly entangled and form a night, which filter is adapted to filter all particles from the exhaust stream through all the particles adhering both to the surface of the silica fibers and being trapped in the formed fiber net, the fiber filter (421; 521) being substantially Open first spirit (423; 523) and a closed second spirit (425; 525). 11. Filteranordning enligt krav 10, kannetecknad av att kiseldioxidfibrema är belagda med ett katalytiskt material, sasom adelmetall.Filter device according to claim 10, characterized in that the silica fibers are coated with a catalytic material, such as noble metal. 12. Filteranordning enligt nagot av krav 10 eller 11, kannetecknad av att fibrema har en diameter pa cirka 7-10 pm.Filter device according to any one of claims 10 or 11, characterized in that the fibers have a diameter of about 7-10 μm. 13. Filteranordning enligt nagot av krav 10-12, kannetecknad av all fiberfiltrets (421; 521) oppna forsta ande (423; 523) har ett tvarsnitt som motsvarar avgasledningens och/eller returledningens tvarsnitt.Filter device according to any one of claims 10-12, characterized in that the open first end (423; 523) of all the fiber filter (421; 521) has a cross section corresponding to the cross section of the exhaust line and / or the return line. 14. Filteranordning enligt nagot av krav 10-13, kannetecknad av att filteranordningen är forsedd med atminstone en flans (431; 531; 531') for att underlatta montering av filteranordningen (219; 319; 419; 519) i en ledning och har en form och storlek som motsvarar ledningens form och storlek 13Filter device according to any one of claims 10-13, characterized in that the filter device is provided with at least one flange (431; 531; 531 ') to facilitate mounting of the filter device (219; 319; 419; 519) in a conduit and has a shape and size corresponding to the shape and size of the line 13 15. Filteranordning enligt nagot av krav 10-14, kannetecknad av all fiberfiltret (421; 521) omges av ett metallnat (427).A filter device according to any one of claims 10-14, characterized in that all of the fiber filter (421; 521) is surrounded by a metal mesh (427). 16. Forbranningsmotor (2), kannetecknad av aft motom (2) innefattar ett 6tercirkulationssystem (100; 200; 300) enligt nagot av krav 1-9. 17. Forbranningsmotor (2), kannetecknad av aft motom (2) innefattar en filteranordning (219; 319; 419; 519) enligt nagot av krav -Internal combustion engine (2), characterized in that the engine (2) comprises a recirculation system (100; 200; 300) according to any one of claims 1-9. An internal combustion engine (2), characterized in that the engine (2) comprises a filter device (219; 319; 419; 519) according to any one of claims - 17. 18.Fordon (1) kannetecknat av all fordonet (1) innefattar en forbranningsmotor (2) enligt nagot av krav 16 eller 17. 14 1/4 C 0 2/4 200 4- 207 219 ri - 2 1,11 217 207 Figur 2 05 \-...// K 203 ---- 201 213 3/4 2 301 , / 30( 309 304 T303 301 319 3 317 311 Figur 3 414 419421 423 427431 Figur 4 Figur 531 ... . ,519533( 521 - 52317. 18. Vehicle (1) can be characterized by all the vehicle (1) comprises an internal combustion engine (2) according to any one of claims 16 or 17. 14 1/4 C 0 2/4 200 4- 207 219 ri - 2 1.11 217 207 Figure 2 05 \ -... // K 203 ---- 201 213 3/4 2 301, / 30 (309 304 T303 301 319 3 317 311 Figure 3 414 419421 423 427431 Figure 4 Figure 531 .... , 519533 (521-523
SE1350005A 2013-01-04 2013-01-04 Exhaust gas recirculation system of an internal combustion engine and filter device for the system SE538192C2 (en)

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SE1350005A SE538192C2 (en) 2013-01-04 2013-01-04 Exhaust gas recirculation system of an internal combustion engine and filter device for the system
PCT/SE2013/051530 WO2014107130A1 (en) 2013-01-04 2013-12-17 System for recirculation of exhaust from a combustion engine and filter device for such a system

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US9528475B2 (en) * 2014-11-11 2016-12-27 Ford Global Technologies, Llc Method and system for EGR control
DE102015217541B4 (en) * 2015-09-14 2017-04-06 Magna powertrain gmbh & co kg Radiator arrangement for a motor vehicle
KR102417393B1 (en) * 2018-06-15 2022-07-06 현대자동차주식회사 Egr filter preventing clogging

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DE10031154A1 (en) * 2000-06-27 2002-01-10 Siegfried Kany Soot filter used in diesel engines comprises hollow cylindrical filter insert consisting of threads and/or yarn formed from silicon dioxide endless fibers
DE202006015784U1 (en) * 2006-10-12 2008-02-14 Mann + Hummel Gmbh filtering device
DE102008031657A1 (en) * 2008-07-03 2010-01-07 Volkswagen Ag Exhaust converter for exhaust system for catalytic after treatment of combustion engine exhaust gases, has converter housing and carrier body arranged in converter housing
DE102008038736A1 (en) * 2008-08-12 2010-02-18 Man Nutzfahrzeuge Aktiengesellschaft Particle separator, in particular particle filter, for the separation of particles from the exhaust gas flow of an internal combustion engine
DE102008038235A1 (en) * 2008-08-18 2010-02-25 Mahle International Gmbh Internal combustion engine
DE102009043577B4 (en) * 2008-10-01 2014-01-23 Witzenmann Gmbh Decoupling element with a filter element
DE202011100884U1 (en) * 2011-05-18 2012-08-20 Witzenmann Gmbh Filter and filter element for the exhaust system of a motor vehicle

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