EP2670967B1 - Abgasrückführungseinrichtung für eine brennkraftmaschine - Google Patents

Abgasrückführungseinrichtung für eine brennkraftmaschine Download PDF

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Publication number
EP2670967B1
EP2670967B1 EP12701116.1A EP12701116A EP2670967B1 EP 2670967 B1 EP2670967 B1 EP 2670967B1 EP 12701116 A EP12701116 A EP 12701116A EP 2670967 B1 EP2670967 B1 EP 2670967B1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
line
internal combustion
combustion engine
gas
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
EP12701116.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2670967A1 (de
Inventor
Michael Heim
Andrew Glynn
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.)
Mann and Hummel GmbH
Original Assignee
Mann and Hummel GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mann and Hummel GmbH filed Critical Mann and Hummel GmbH
Publication of EP2670967A1 publication Critical patent/EP2670967A1/de
Application granted granted Critical
Publication of EP2670967B1 publication Critical patent/EP2670967B1/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
    • F02M26/36—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for adding fluids other than exhaust gas to the recirculation passage; with reformers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • 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 an exhaust gas recirculation device for an internal combustion engine according to the preamble of claim 1.
  • the exhaust gas recirculation device comprises a return line, which branches off downstream of an exhaust gas purification unit in the exhaust system of the internal combustion engine and opens into the intake system upstream of a compressor, which is part of an exhaust gas turbocharger.
  • the exhaust gas turbine of the exhaust gas turbocharger is arranged upstream of the exhaust gas purification unit in the exhaust gas line.
  • an adjustable valve and an exhaust gas cooler are arranged, via which the exhaust gas is cooled to lower temperatures before being introduced into the intake tract. Furthermore, a cyclone separator is arranged in the return line, can be excreted on the particles, which are carried in the gas flow through the return line. Such particles, which originate for example from the exhaust gas purification unit, can lead to damage to the engine and the exhaust gas turbocharger.
  • the invention has for its object to separate with simple measures and in an efficient manner particles from the guided through an exhaust gas recirculation device gas stream in an internal combustion engine.
  • the exhaust gas recirculation device is used in internal combustion engines and serves a part of the exhaust gas flow from the exhaust gas line of the internal combustion engine to recirculate into the intake tract to improve the exhaust gas and consumption behavior of the internal combustion engine.
  • a separator component which serves to deposit particles entrained in the exhaust gas flow through the return line in order to prevent damage to the internal combustion engine or other units assigned to the internal combustion engine.
  • the entrained particles are enlarged by a so-called heterogeneous condensation, by accumulating below the dew point water droplets by condensation on the particles, so that overall the particles have a greater mass and the efficiency of deposition is improved by higher inertial forces.
  • a gas line opens into the return line upstream of the separator component, via which additional gas can be supplied.
  • the additional gas is preferably air, wherein optionally also other gas can be supplied, for example additional exhaust gas.
  • the gas line opens into the mixer component for mixing the gas component with the exhaust gas.
  • the separator component is designed as a cyclone separator.
  • Such Zyklonabscheider are characterized by a structurally simple and efficient design and can be accommodated in a small space.
  • the separation of the particles enlarged by condensed liquid occurs due to the increased inertial forces.
  • the separator component is disposed downstream of the mixer component.
  • the mixer component is a mixing chamber which is integrated in the cyclone separator, wherein in particular the separation region of the cyclone separator can be arranged downstream of the mixing chamber in the flow direction.
  • the exhaust gas recirculation device advantageously comprises a controllable return valve and an exhaust gas cooler, which is integrated in the return line.
  • the height of the exhaust gas mass flow can be adjusted through the return line.
  • the exhaust gas cooler which is arranged upstream of the separator component and the discharge point of the gas line in the return line, the exhaust gas branched out from the exhaust gas line and standing at high temperatures is cooled.
  • the internal combustion engine in which the exhaust gas recirculation device is used, can be equipped with an exhaust gas turbocharger, which comprises a compressor in the intake tract and an exhaust gas turbine in the exhaust gas system.
  • an exhaust gas turbocharger which comprises a compressor in the intake tract and an exhaust gas turbine in the exhaust gas system.
  • diesel internal combustion engines is located downstream of the exhaust gas turbine, a diesel particulate filter in the exhaust system through which the soot particles are separated out in the exhaust gas.
  • the return line branches downstream of the exhaust gas turbine and in the case of the diesel particulate filter downstream of this. Particles which detach from the exhaust gas purification unit, which is normally designed as a particle filter, and which enter the return line, are deposited in the separator component as described above.
  • a diesel particulate filter for example, this comprises a ceramic body, wherein it is avoided via the separator unit that accidentally dissolving ceramic particles get into a possibly present compressor and into the internal combustion engine.
  • a pumping device is provided in the opening into the return line gas line, which promotes the air from the intake tract or alternatively from the environment in the exhaust gas recirculation device.
  • the pumping device can operate with uniform power or be controlled by means of a map.
  • a throttle device is provided in the intake tract between the discharge point for the gas line and the discharge point for the return line of the exhaust gas recirculation device in the intake to increase the pressure gradient between intake and exhaust gas recirculation device, or between discharge point and discharge point on the intake.
  • the throttle device may be set to a constant value or variably controlled according to a predetermined map.
  • the air mass flow to be supplied via the gas line depends on the current load state and / or the rotational speed of the internal combustion engine. It is particularly expedient to reduce the supplied air mass flow or another gas mass flow, which flows via the gas line into the return line, at low loads or speeds, if necessary to increase to zero and at higher loads or speeds, since these operating conditions the cooling of the recirculated exhaust gas mass flow via the exhaust gas cooler may not be sufficient to fall below the dew point.
  • the internal combustion engine 1 shown in the figure is equipped with an exhaust gas turbocharger 2, which comprises an exhaust gas turbine 3 in the exhaust line 4 and a compressor 5 in the intake tract 6.
  • the exhaust gas turbine 3 is driven by the pressurized exhaust gases of the internal combustion engine 1, wherein a compressor in the compressor 5 is driven via a connecting shaft of the turbine wheel in the exhaust turbine 3 and compressed combustion air in the intake manifold 6 to an increased boost pressure, below the combustion air the cylinders of the internal combustion engine 1 is supplied.
  • In the intake 6 is located upstream of the compressor 5, an air filter.
  • a ceramic particle filter 7 is disposed, are separated via the entrained in the exhaust soot particles. Furthermore, an exhaust gas aftertreatment unit 8 is arranged downstream of the particle filter 7 in the exhaust gas line 4.
  • the internal combustion engine 1 is equipped with an exhaust gas recirculation device 10, via which a partial mass flow of the exhaust gas from the exhaust line 4 is fed back into the intake tract 6. This takes place in certain operating states of the internal combustion engine in order to improve the consumption and exhaust gas behavior of the internal combustion engine.
  • the exhaust gas recirculation device 10 comprises a return line 11 which branches off from the exhaust gas line 4 downstream of the particle filter 7 and opens into the intake tract 6 between the air filter 9 and the compressor 5.
  • a return line 11 is an adjustable return valve 12 and an exhaust gas cooler 13, via which the recirculated exhaust gas mass flow is cooled to lower temperatures.
  • a cyclone separator 14 is integrated into the return line 11, wherein particles entrained in the exhaust gas mass flow are separated via the cyclone separator 14. This is done by the inertial forces of the particles, causing them to accumulate in the cyclone 14, whereas the exhaust gas is forwarded via the clean air outlet 18 of the cyclone 14 in the intake manifold 6.
  • condensation of moisture takes place Dirt particles in the recirculated exhaust gas mass flow downstream of the gas cooler 13 instead. This gives the particles a considerably higher weight, which improves the separation in the cyclone separator.
  • a gas line 15 is provided, which downstream of the air filter 9, but upstream of the discharge point of the return line 11 branches into the intake tract 6 of this and in a mixer 17, located in the return line 11 between the exhaust gas cooler 13 and the cyclone separator 14 is located.
  • Via the gas line 15 sucked ambient air, which was filtered in the air filter 9, is returned from the intake manifold 6 and passed in the region of the mixer 17 in the return line 11 and mixed there with the recirculated exhaust gas mass flow.
  • the temperature of the exhaust gas continues to drop, whereby the dew point can be exceeded in further operating ranges and a better condensation of moisture on the particles in the exhaust gas mass flow is achieved.
  • the degree of separation in the cyclone separator 14 is improved.
  • an adjustable control valve 16 is arranged to adjust the air mass flow through the gas line 15. In particular, it is provided to determine the proportion of the air mass flow through the gas line 15 as a function of the current operating state of the internal combustion engine.
  • the recirculated gas mass flow advantageously depends on the current load state and / or the speed of the internal combustion engine, preferably in such a way that at low loads or speeds of the air mass flow through the gas line 15 is reduced, optionally to zero, and at higher loads or speeds is increased.
  • the gas line 15 is designed as a separate line, which does not branch from the intake, but is to be introduced via the additional gas, in particular ambient air in the return line, optionally with an additional air filter 19 in the gas line 15 is integrated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
EP12701116.1A 2011-01-31 2012-01-25 Abgasrückführungseinrichtung für eine brennkraftmaschine Not-in-force EP2670967B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011009916A DE102011009916A1 (de) 2011-01-31 2011-01-31 Abgasrückführungseinrichtung für eine Brennkraftmaschine
PCT/EP2012/051089 WO2012104177A1 (de) 2011-01-31 2012-01-25 Abgasrückführungseinrichtung für eine brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP2670967A1 EP2670967A1 (de) 2013-12-11
EP2670967B1 true EP2670967B1 (de) 2014-12-03

Family

ID=45531409

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12701116.1A Not-in-force EP2670967B1 (de) 2011-01-31 2012-01-25 Abgasrückführungseinrichtung für eine brennkraftmaschine

Country Status (5)

Country Link
US (1) US20130305693A1 (ko)
EP (1) EP2670967B1 (ko)
KR (1) KR20140018223A (ko)
DE (1) DE102011009916A1 (ko)
WO (1) WO2012104177A1 (ko)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6386363B2 (ja) * 2014-12-12 2018-09-05 株式会社オティックス 内燃機関用の過給装置
FR3048023A1 (fr) * 2016-02-24 2017-08-25 Peugeot Citroen Automobiles Sa Ensemble moteur comprenant un dispositif de recirculation de gaz d’echappement a filtre cyclonique

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986005239A1 (en) * 1985-03-05 1986-09-12 John Emery Lindberg Engine combustion control system and method employing condensation of some exhaust gas
US4696279A (en) * 1985-08-30 1987-09-29 Combustion Control Developments, Ltd. Combustion control system
JPH0882257A (ja) * 1994-09-14 1996-03-26 Ngk Insulators Ltd 内燃機関の排気ガス再循環装置
US5974802A (en) * 1997-01-27 1999-11-02 Alliedsignal Inc. Exhaust gas recirculation system employing a fluidic pump
DE102005050133A1 (de) * 2004-10-25 2006-04-27 Behr Gmbh & Co. Kg Turboladeranordnung und Verfahren zum Betreiben eines Turboladers
DE202007005986U1 (de) * 2007-04-24 2008-09-04 Mann+Hummel Gmbh Verbrennungsluft- und Abgasanordnung eines Verbrennungsmotors
JP4730366B2 (ja) 2007-10-17 2011-07-20 トヨタ自動車株式会社 内燃機関の排気還流装置

Also Published As

Publication number Publication date
WO2012104177A1 (de) 2012-08-09
EP2670967A1 (de) 2013-12-11
US20130305693A1 (en) 2013-11-21
KR20140018223A (ko) 2014-02-12
DE102011009916A1 (de) 2012-08-02

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