EP2024630B1 - Verbrennungsmotor mit abgasrückführungssystem - Google Patents

Verbrennungsmotor mit abgasrückführungssystem Download PDF

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Publication number
EP2024630B1
EP2024630B1 EP07766013A EP07766013A EP2024630B1 EP 2024630 B1 EP2024630 B1 EP 2024630B1 EP 07766013 A EP07766013 A EP 07766013A EP 07766013 A EP07766013 A EP 07766013A EP 2024630 B1 EP2024630 B1 EP 2024630B1
Authority
EP
European Patent Office
Prior art keywords
circuit
main
exhaust gas
cold
cylinder head
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.)
Not-in-force
Application number
EP07766013A
Other languages
English (en)
French (fr)
Other versions
EP2024630A1 (de
Inventor
Cedrick Hennion
Jacques Portalier
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.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
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 Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP2024630A1 publication Critical patent/EP2024630A1/de
Application granted granted Critical
Publication of EP2024630B1 publication Critical patent/EP2024630B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M26/41—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories characterised by the arrangement of the recirculation passage in relation to the engine, e.g. to cylinder heads, liners, spark plugs or manifolds; characterised by the arrangement of the recirculation passage in relation to specially adapted combustion chambers
    • 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
    • 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
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/09—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine
    • F02M26/10—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine having means to increase the pressure difference between the exhaust and intake system, e.g. venturis, variable geometry turbines, check valves using pressure pulsations or throttles in the air intake or exhaust system

Definitions

  • the present invention claims the priority of the French application 0652502 filed on 07/06/2006 .
  • the invention relates to an internal combustion engine equipped with an exhaust gas recirculation circuit.
  • This EGR circuit must therefore pass from the exhaust manifold to the intake manifold in fresh gas from the vehicle.
  • it is chosen to implement this circuit by passing through the cylinder head, near the water core.
  • the recirculation gases are cooled by this crossing.
  • this cooling is favorable especially for the reduction of NOx gas emissions and moreover, the EGR circuit is usually equipped with a heat exchanger in which circulates the coolant. the engine to further cool the exhaust before reintroducing it to the intake.
  • the invention proposes an internal combustion engine having an exhaust gas recirculation circuit whose flow rate is regulated by main control means, said recirculation circuit passing through the cylinder head and comprising a main branch and a branch. cold associated with a heat exchanger and means for regulating the flow of recirculated gas admitted into the cold leg, the portion of the circuit passing through the cylinder head being constituted by a double concentric tube, the inner tube being part of the main branch and the outer tube of the cold branch.
  • the main branch is thermally insulated from the cylinder head by the outer tube. In the critical phases for which no cooling of the recirculated gases is desirable, the flow is stopped in the cold leg.
  • the main control means are located downstream from the branch point of the main and cold branches, then the cold branch is always full of relatively hot exhaust gases (even if they are cooled by the cylinder head) so the inner tube is always maintained in temperature.
  • the figure 1 is a schematic view of an exhaust gas recirculation circuit of an internal combustion engine
  • the figure 2 is a diagram of an exhaust gas recirculation circuit according to the invention.
  • the figure 1 illustrates very schematically an internal combustion engine, especially for motor vehicles.
  • the engine 1 comprises a number of cylinders 2 (here four in number aligned on a bench) forming combustion chambers, in which pistons move.
  • Each cylinder is supplied with fresh gas by a so-called intake circuit, generally designated 3.
  • This intake circuit opens onto an intake manifold 4, valves, of which the opening and closing are controlled for example by a camshaft, to control each engine cycle the amount of fresh gas admitted into the cylinder.
  • Fuel is also injected into the cylinders, and the air-fuel mixture is ignited, either following the compression of the mixture (diesel engine) or in a controlled manner using for example spark plugs.
  • the burnt gases from the combustion in the cylinders are collected by an exhaust manifold 5 and then directed to the actual exhaust line.
  • This exhaust line 6 typically comprises a turbine 7, rotated by the exhaust gas, energizing a compressor 8 associated with the intake circuit.
  • the exhaust line 6 comprises elements making it possible to limit the discharges of pollutants such as, for example, an oxidation catalyst 9 associated with a particle filter 10 in the case of a diesel engine. These means are well known to those skilled in the art and there is no need to specify them in more detail, as it is necessary to specify that these pollution control elements can be adapted according to the engine.
  • the intake circuit essentially comprises an air filter 10, the compressor 8 associated with the turbine and a heat exchanger 11, placed downstream of the compressor and ensuring a heat exchange between the heated air through its passage through compressor and a heat transfer liquid, such as water, cooled for example by a fan sucking air at the front of the vehicle (the cooling circuit is not shown schematically on this figure 1 ), and the air heated by its passage through the compressor.
  • a heat transfer liquid such as water
  • a bypass 12 makes it possible to return a fraction of the exhaust gas to the level of the intake.
  • Main means 13 for regulating the flow of exhaust gas admitted to circulate in this branch are provided, such as for example a pilot valve.
  • the exhaust gas recirculation circuit itself has a branch branch, called cold branch 14, associated with a heat exchanger. Secondary means 15 for regulating the flow of recirculated gases admitted into the cold leg are provided.
  • the main branch of the recirculated gas in which the gases are not cooled by a heat exchanger, is also called hot branch 16, the term "main branch" may seem somewhat improper if the vast majority of recirculated gas flow is actually diverted to the cold branch.
  • the exhaust gas recirculation circuit has been shown as a totally external circuit to the engine block.
  • a fairly common layout plan assumes a crossing of the cylinder head by this circuit as shown in FIG. figure 2 .
  • the conduit 12 thus passes through the cylinder head 17 of the engine 1 connecting the exhaust manifold 5 to the downstream part of the exhaust gas recirculation circuit, on the intake side.
  • the main valve 13 controls the amount of gas readmitted to the intake.
  • the admission to the cold branch 14, provided with an exchanger 18 for cooling the exhaust gas is controlled by a mixer 16.
  • the engine cooling circuit necessarily comprises a cooling of the cylinder head, with such an implantation, it is clear that the recycled exhaust gas is subjected to a first cooling during the crossing of the cylinder head.
  • the cold branch 14 has its origin upstream of the crossing of the cylinder head, and preferably, as in the case shown in FIG. figure 3 , opens directly from the collector (or part of the exhaust circuit downstream thereof), so that the ducts associated respectively with the cold branch 14 and the hot leg 16 are concentric, the hot leg being isolated from the cylinder head by the cold branch, and coming to join the cold branch downstream of the exchanger 18
  • the central tube which contains recirculated gases not intended to be cooled, is in contact only with its outer concentric tube which provides a thermal insulation by air knife. This allows these gases to pass through the cylinder head with very little loss of temperature.
  • the outer tube which contains the recirculated gases for cooling, is as for a conventional system, in contact with the cylinder head which cools it.
  • the two streams of recirculated gas are found outside the cylinder head after the exchanger 18 and are mixed in a mixer 15 which allows the regulation of the temperature.
  • the total flow rate of the recirculated gases is then regulated by the valve 13.

Landscapes

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

Claims (3)

  1. Brennkraftmaschine mit einer Abgasrückführungsleitung, deren Durchfluss durch Hauptregulierungsmittel reguliert wird, wobei der Rückführungskreis durch den Zylinderkopf verläuft und ein Hauptzweig und einen Kühlzweig, der einem Wärmetauscher zugeordnet ist, sowie Mittel zum Regulieren des Durchflusses rückgeführter Gase, die dem Kühlzweig zugeführt werden, enthält, dadurch gekennzeichnet, dass der durch den Zylinderkopf verlaufende Leitungsabschnitt durch ein konzentrisches Doppelrohr gebildet ist, wobei das Innenrohr einen Teil des Hauptzweigs bildet und das Außenrohr einen Teil des Kühlzweigs bildet.
  2. Maschine nach Anspruch 1, dadurch gekennzeichnet, dass die Hauptregulierungsmittel stromabseitig des Abzweigpunkts des Hauptzweigs und des Kühlzweigs vorhanden sind.
  3. Maschine nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, dass der Hauptzweig und der Kühlzweig in die Abgasleitung münden.
EP07766013A 2006-06-07 2007-05-09 Verbrennungsmotor mit abgasrückführungssystem Not-in-force EP2024630B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0652502A FR2902151B1 (fr) 2006-06-07 2006-06-07 Moteur a combustion interne ayant un circuit de recirculation des gaz d'echappement
PCT/FR2007/051233 WO2007141435A1 (fr) 2006-06-07 2007-05-09 Moteur a combustion interne ayant un circuit de recirculation des gaz d'echappement

Publications (2)

Publication Number Publication Date
EP2024630A1 EP2024630A1 (de) 2009-02-18
EP2024630B1 true EP2024630B1 (de) 2010-09-01

Family

ID=37649560

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07766013A Not-in-force EP2024630B1 (de) 2006-06-07 2007-05-09 Verbrennungsmotor mit abgasrückführungssystem

Country Status (6)

Country Link
EP (1) EP2024630B1 (de)
AT (1) ATE479835T1 (de)
DE (1) DE602007008884D1 (de)
ES (1) ES2350277T3 (de)
FR (1) FR2902151B1 (de)
WO (1) WO2007141435A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011109264A1 (de) * 2011-08-03 2013-02-07 Man Truck & Bus Ag Abgasrückführeinrichtung für eine Brennkraftmaschine eines Fahrzeuges sowie Verfahren zum Betreiben einer Abgasrückführeinrichtung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59901383D1 (de) * 1998-08-19 2002-06-13 Bayerische Motoren Werke Ag Abgasanlage einer Brennkraftmaschine mit einem Speichervolumen
JP3579643B2 (ja) * 2000-10-13 2004-10-20 本田技研工業株式会社 エンジンのシリンダヘッド
DE10260251A1 (de) * 2002-12-20 2004-07-01 Siemens Ag Kühlelement für Gase
WO2005042960A1 (en) * 2003-10-17 2005-05-12 Honeywell International Inc. Internal bypass exhaust gas cooler
JP4323333B2 (ja) * 2004-01-19 2009-09-02 株式会社マーレ フィルターシステムズ 内燃機関の排気還流装置

Also Published As

Publication number Publication date
EP2024630A1 (de) 2009-02-18
ATE479835T1 (de) 2010-09-15
DE602007008884D1 (de) 2010-10-14
FR2902151A1 (fr) 2007-12-14
WO2007141435A1 (fr) 2007-12-13
ES2350277T3 (es) 2011-01-20
FR2902151B1 (fr) 2008-08-08

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