EP1937956A1 - Systeme de recyclage et de refroidissement des gaz d'echappement d'un moteur a combustion - Google Patents

Systeme de recyclage et de refroidissement des gaz d'echappement d'un moteur a combustion

Info

Publication number
EP1937956A1
EP1937956A1 EP06806021A EP06806021A EP1937956A1 EP 1937956 A1 EP1937956 A1 EP 1937956A1 EP 06806021 A EP06806021 A EP 06806021A EP 06806021 A EP06806021 A EP 06806021A EP 1937956 A1 EP1937956 A1 EP 1937956A1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
valve
egr
egr valve
oxidation catalyst
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06806021A
Other languages
German (de)
English (en)
Inventor
Jens Ruckwied
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle Behr GmbH and Co KG
Original Assignee
Behr GmbH and Co KG
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 Behr GmbH and Co KG filed Critical Behr GmbH and Co KG
Publication of EP1937956A1 publication Critical patent/EP1937956A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F02M26/22—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
    • 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
    • F02M26/11—Manufacture or assembly of EGR systems; Materials or coatings specially adapted for EGR systems
    • 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
    • F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities
    • 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
    • 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
    • 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
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • 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

Definitions

  • the invention relates to a device for the return and cooling of exhaust gas of an internal combustion engine, in particular a diesel engine of a motor vehicle according to the preamble of claim 1 - known from DE 10 2004 042 454 A1 of the applicant.
  • EGR exhaust gas recirculation
  • DE 10 2004 042 454 A1 of the applicant wherein in an exhaust gas recirculation line (EGR line) an exhaust gas recirculation valve (EGR valve) and an exhaust gas heat exchanger or exhaust gas cooler are arranged.
  • the internal combustion engine is a diesel engine which causes soot particles in the exhaust gas.
  • DOC diesel oxidation catalyst
  • HC hydrocarbons
  • the oxidation catalyst is partly also integrated into the exhaust gas cooler, in such a way that the oxidation-catalytic coating in the diffuser (intake Stutzen) of the exhaust gas cooler and / or on the inner walls of the exhaust pipes is arranged.
  • a similar exhaust gas recirculation system for a diesel engine was known from DE 94 21 145 U1, wherein in an EGR line also an oxidation catalyst and an exhaust gas cooler are arranged behind one another or integrated with each other. By an oxidation catalysis of the hydrocarbons contained in the diesel exhaust, a sticking of the exhaust gas cooler with soot particles is avoided.
  • EP 1 203 148 B1 has disclosed an EGR system for a diesel engine, wherein an oxidation catalytic converter and a soot filter are arranged in an exhaust gas line downstream of an exhaust gas turbine. Downstream of the oxidation catalyst, but upstream of the soot filter branches off an EGR line, in which an exhaust gas cooler and downstream of the exhaust gas cooler, an EGR valve is arranged. The recirculated exhaust gas is fed into an intake pipe and fed to the diesel engine via a first intercooler, a compressor and a second intercooler.
  • a disadvantage of the known EGR systems is that the EGR valve itself is not optimally protected against contamination, in particular soot deposition.
  • the oxidation catalytic converter is arranged upstream of the EGR valve in the flow direction of the exhaust gas, in particular directly in front of the EGR valve.
  • the oxidation catalytic converter can either be located in the exhaust gas line in front of or behind an exhaust gas turbine or arranged in the EGR line.
  • the EGR valve is located in the flow direction in front of the exhaust gas cooler, ie on its "hot" side .
  • the EGR valve is arranged directly in front of the exhaust gas heat exchanger, by means of which both the EGR valve and the exhaust gas cooler are in front of one another Soot deposit protected.
  • the oxidation catalyst is integrated into the EGR valve.
  • the diesel oxidation catalyst (DOC) preferably consists of a noble metal coating, which is applied to a carrier.
  • the noble metal is preferably platinum.
  • the carrier body of the oxidation catalyst is integrated tor together with the Oxidationskatalysa-, in particular in the inlet of the EGR valve.
  • the carrier body is in particular designed such that it fills the entire cross section of the inlet.
  • the carrier body is in particular cylindrical, conical, etc. formed.
  • the space is optimally utilized and increases the surface of the oxidation catalyst in an advantageous manner.
  • the oxidation catalyst is integrated in particular as a coating directly in the inlet of the EGR valve.
  • this saves in particular the carrier material.
  • an EGR valve When integrated into the EGR valve, the inner wall of the EGR valve, which is acted upon by the exhaust gas, serves as a carrier for the oxidation-catalytic coating.
  • An EGR valve consists inter alia of a diffuser, ie an inlet nozzle, a valve housing and a valve closure member, for. B. a valve disk - these parts are covered by the exhaust gas and can therefore be coated oxidation catalysed, thereby preventing condense of hydrocarbons contained in the exhaust gas and thus sticking of soot particles on the walls of the EGR Valve is prevented.
  • an additional Oxidati- onskatalysator could be omitted in the EGR line or dimensioned correspondingly smaller.
  • the EGR valve with oxidation catalytic coating can be integrated with the exhaust gas cooler to form a structural unit, as is known per se from DE 197 50 588 A1 of the Applicant. Again, the EGR valve is located on the "hot" side of the exhaust gas cooler.
  • the exhaust gas cooler may additionally have a bypass for the exhaust gas, which is controlled by a bypass valve - such an exhaust gas heat exchanger with internal bypass is known for example from DE 102 03 003 A1.
  • the EGR valve, the bypass valve, the oxidation catalyst and the exhaust gas heat exchanger are integrally formed. In an advantageous manner, in particular the installation space is thereby reduced.
  • the single FIGURE shows a schematic illustration of an exhaust gas recirculation system (EGR system) 1 for an internal combustion engine designed as a diesel engine 2.
  • the diesel engine 2 has an exhaust pipe 3, in which an exhaust gas turbine 4 is arranged, which drives a compressor 5.
  • the diesel engine 2 is associated with a suction line 6, in which the compressor 5 and a charge air cooler 7 are arranged.
  • An exhaust gas recirculation line (EGR line) 8 is switched on between the exhaust line 3 and the intake line 6, the exhaust gas being taken off at a branching point 9 in the flow direction upstream of the exhaust gas turbine 4 and fed to the intake line 6 at a feed point 10.
  • an oxidation catalytic converter 11 In the EGR line 8, an oxidation catalytic converter 11, an exhaust gas recirculation valve (EGR valve) 12 and an exhaust gas cooler 13 are arranged in succession in the flow direction of the exhaust gas.
  • the EGR valve 12 is thus disposed on the "hot" side of exhaust gas cooler 13, and the oxidation catalyst 11 for converting hydrocarbons (HC) contained in the diesel exhaust gas is disposed upstream of EGR valve 12.
  • the oxidation catalyst 11 is known from the aforementioned prior art: it consists of a ceramic or metallic carrier (honeycomb body) which is provided with an oxidation-catalytic coating, in particular platinum.
  • the EGR valve 12 is also known from the prior art and may be designed so that it controls only the exhaust gas recirculation amount and z. B. is designed as a poppet valve. Alternatively, the EGR valve can also - which is not shown - be designed as a so-called combination valve with two functions. Such a valve regulates the exhaust gas recirculation amount. In addition, such a valve takes over the switching function between cooling and bypass operation in an exhaust gas heat exchanger with bypass.
  • Such a combination valve is known, for example, from unpublished DE102005041146, from unpublished DE102005041149 and from unpublished DE102005041150, the entire contents of which are hereby expressly disclosed.
  • the oxidation catalyst 11 can be integrated into the EGR valve 12.
  • the oxidation-catalytic coating is arranged on the inner wall of the EGR valve, that is, for example, on the inner wall of a diffuser or a valve housing or a valve disk.
  • the upstream oxidation catalyst can be completely or partially dispensed with, at the same time the EGR valve is protected from contamination.
  • the EGR valve 12 may be integrated with the exhaust gas cooler 13 to form a structural unit, wherein the EGR valve has its upstream position to the exhaust gas cooler, i. H. maintains on its "hotter" side.

Abstract

L'invention concerne un système de recyclage et de refroidissement des gaz d'échappement d'un moteur à combustion, en particulier d'un moteur diesel (2) d'un véhicule automobile, ce moteur à combustion (2) présentant une conduite d'admission (6) et une conduite d'échappement (3), ainsi qu'une conduite de recyclage des gaz d'échappement (conduite RGE) (8). Au moins un échangeur de chaleur de gaz d'échappement (13), une soupape RGE (12) et un catalyseur à oxydation (11) présentant un revêtement catalytique d'oxydation sont disposés dans la conduite d'échappement (3) ou dans la conduite RGE (8). Selon l'invention, le catalyseur à oxydation (11) est disposé en amont de la soupape RGE (12) dans le sens d'écoulement des gaz d'échappement.
EP06806021A 2005-10-12 2006-10-14 Systeme de recyclage et de refroidissement des gaz d'echappement d'un moteur a combustion Withdrawn EP1937956A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005049309A DE102005049309A1 (de) 2005-10-12 2005-10-12 Vorrichtung zur Rückführung und Kühlung von Abgas einer Brennkraftmaschine
PCT/EP2006/009581 WO2007042181A1 (fr) 2005-10-12 2006-10-04 Systeme de recyclage et de refroidissement des gaz d'echappement d'un moteur a combustion

Publications (1)

Publication Number Publication Date
EP1937956A1 true EP1937956A1 (fr) 2008-07-02

Family

ID=37452927

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06806021A Withdrawn EP1937956A1 (fr) 2005-10-12 2006-10-14 Systeme de recyclage et de refroidissement des gaz d'echappement d'un moteur a combustion

Country Status (3)

Country Link
EP (1) EP1937956A1 (fr)
DE (1) DE102005049309A1 (fr)
WO (1) WO2007042181A1 (fr)

Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
DE102007050897A1 (de) * 2007-10-24 2009-04-30 Continental Automotive Gmbh Ventil zur Steuerung des Abgasrückflusses
DE102007055422B4 (de) * 2007-11-20 2015-04-02 BorgWarner Esslingen GmbH Ventil zur Steuerung des Durchflusses eines gasförmigen oder flüssigen Mediums
FR2935024B1 (fr) * 2008-08-13 2011-05-27 Renault Sas Procede de decollement de depots sur les parois d'echange thermique d'un refroidissement de recirculation des gaz d'echappement et moteur a combustion interne
DE102009018525B4 (de) 2009-04-24 2015-03-05 Pierburg Gmbh Abgasrückführsystem für einen Verbrennungsmotor
DE102009037923A1 (de) * 2009-08-19 2011-02-24 Behr America, Inc., Troy Anordnung zur Rückführung und Kühlung von Abgas einer Brennkraftmaschine
KR20160128354A (ko) 2014-02-27 2016-11-07 존슨 맛쎄이 퍼블릭 리미티드 컴파니 Egr 회로에 n2o 촉매를 가진 배기 시스템
WO2021262418A1 (fr) * 2020-06-26 2021-12-30 Cummins Inc. Composants de système de moteur comprenant des revêtements catalytiques, et appareils, procédés, systèmes et techniques associés

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JPH0666208A (ja) * 1991-09-10 1994-03-08 Yanmar Diesel Engine Co Ltd ディーゼル機関の排気ガス還流装置
DE9421145U1 (de) 1994-04-28 1995-05-04 Mtu Friedrichshafen Gmbh Dieselbrennkraftmaschine mit in einer Abgasrückführleitung angeordnetem Wärmetauscher für die Abgaskühlung
JPH094522A (ja) * 1995-06-21 1997-01-07 Hitachi Ltd 排気ガス再循環制御装置
DE19750588B4 (de) 1997-11-17 2016-10-13 MAHLE Behr GmbH & Co. KG Vorrichtung zur Abgasrückführung für einen Verbrennungsmotor
AT2217U3 (de) * 1997-11-20 1999-01-25 Avl List Gmbh Brennkraftmaschine mit einem einlasssystem und einem auslasssystem
JP3577956B2 (ja) * 1998-07-23 2004-10-20 トヨタ自動車株式会社 内燃機関の排気浄化装置
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Also Published As

Publication number Publication date
DE102005049309A1 (de) 2007-04-19
WO2007042181A1 (fr) 2007-04-19

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