EP2395224A2 - Véhicule automobile et procédé de fonctionnement d`un moteur à combustion interne - Google Patents

Véhicule automobile et procédé de fonctionnement d`un moteur à combustion interne Download PDF

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Publication number
EP2395224A2
EP2395224A2 EP11004693A EP11004693A EP2395224A2 EP 2395224 A2 EP2395224 A2 EP 2395224A2 EP 11004693 A EP11004693 A EP 11004693A EP 11004693 A EP11004693 A EP 11004693A EP 2395224 A2 EP2395224 A2 EP 2395224A2
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
turbine
combustion engine
internal combustion
motor vehicle
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Withdrawn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
EP11004693A
Other languages
German (de)
English (en)
Inventor
Hubert Vollmer
Jörg Riegner
Thomas Hentschel
Dirk Schlösser
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.)
Audi AG
Original Assignee
Audi AG
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 Audi AG filed Critical Audi AG
Publication of EP2395224A2 publication Critical patent/EP2395224A2/fr
Withdrawn legal-status Critical Current

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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
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/07—Mixed pressure loops, i.e. wherein recirculated exhaust gas is either taken out upstream of the turbine and reintroduced upstream of the compressor, or is taken out downstream of the turbine and reintroduced 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
    • F02M26/04—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
    • F02M26/04—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
    • 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
    • F02M26/22—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

Definitions

  • the invention relates to a motor vehicle specified in the preamble of claim 1 and a motor vehicle specified in the preamble of claim 6.
  • Art for the invention also includes a method for operating an internal combustion engine specified in the preamble of claim 10. Art.
  • the Fig. 1 shows an internal combustion engine 10, which has six cylinders 12. From the internal combustion engine 10, exhaust gas produced by combustion processes in the cylinders 12 is conducted via corresponding lines of an exhaust tract 14 for the internal combustion engine 10 to a turbine 16 of an exhaust gas turbocharger 18. From this exhaust gas, a turbine wheel of the turbine 16 is driven. In the flow direction of the exhaust gas according to directional arrows 20 downstream of the turbine 16, an exhaust aftertreatment device 22 is arranged in the exhaust tract 14, which comprises an oxidation catalyst 24 and a diesel particulate filter 26. The exhaust after-treatment device 22 cleans the exhaust gas before it is discharged according to a directional arrow 28 into the environment. Downstream of the exhaust gas aftertreatment device 22, an exhaust flap 31 is arranged, by means of which the exhaust gas in the exhaust gas tract 14 can be stowed.
  • exhaust gas In the flow direction of the exhaust gas, exhaust gas is discharged both upstream and downstream of the turbine 16 at respective removal points 30 and 32 and is conducted via a respective line system 34 and 36 to an intake tract 38.
  • the removal of the exhaust gas at the removal point 30 is done in the context of a so-called low-pressure exhaust gas recirculation, since the exhaust gas after the turbine 16 has a lower pressure than before the turbine 16.
  • the exhaust gas is first passed through an exhaust gas recirculation cooler 40, by means of which the exhaust gas is cooled.
  • An exhaust gas recirculation valve 42 serves to adjust an amount of exhaust gas discharged at the discharge point 30 and supplied to the intake passage 38.
  • the exhaust gas discharged at the removal point 30 is introduced at an introduction point 43 into the intake tract 38; this introduction point 43 is arranged downstream of an air filter 46 and a hot-film air-mass meter 48 of the intake tract 38 in the flow direction of an air sucked in by the internal combustion engine 10 according to a directional arrow 44; In addition, it is arranged upstream of a compressor 50 of the exhaust gas turbocharger 18.
  • the air filter 46 cleans the sucked air
  • the hot film air mass meter 48 measures the mass of the sucked air.
  • the sucked-in air is acted upon by the discharged exhaust gas, so that this results in an air / exhaust gas mixture which is compressed by the compressor 50 and thereby heated.
  • a charge air cooler 52 is arranged, which cools the air / exhaust gas mixture heated by the compression.
  • a throttle valve 54 is disposed in the intake passage 38. If the internal combustion engine 10 is designed as a gasoline engine, then the throttle valve 54 is used to set a quantity of the sucked by the internal combustion engine 10 air to represent a desired torque of the internal combustion engine 10. If the internal combustion engine 10 is designed as a diesel engine, then the throttle valve 54 serves to provide a certain pressure gradient, in order thus to be able to provide a desired, in particular high, amount of exhaust gas to be recirculated.
  • the exhaust gas discharged at the removal point 32 is also directed to the intake tract 38 via an exhaust gas recirculation valve 56 and an exhaust gas recirculation cooler 58.
  • an exhaust gas recirculation valve 56 By means of the exhaust gas recirculation valve 56, the amount of exhaust gas to be discharged at the removal point 32 is adjustable, while the exhaust gas is cooled by means of the exhaust gas recirculation cooler 58.
  • a bypass device 60 is also arranged over which bypasses the exhaust gas recirculation cooler 58 at least from a subset of the exhaust point 32 derived at the exhaust gas who can, without this subset of the exhaust gas recirculation cooler 58 cooled becomes.
  • the bypass device 60 comprises a valve device 62.
  • the exhaust gas discharged at the removal point 32 is at an introduction point 63 downstream of the compressor in the flow direction of the intake air 50 is arranged.
  • the exhaust gas recirculation valves 42 and 56 and the exhaust gas recirculation coolers 40 and 58 cause high costs, which is partly due to high component costs and on the other hand by a high control or regulatory effort.
  • Advantages of a guidance of the exhaust gas to the intake tract 38 is that thereby the harmful emissions, in particular the particle and nitrogen oxide emissions, of the internal combustion engine can be reduced.
  • the DE 10 2005 052 496 A1 discloses an internal combustion engine in which exhaust gas is fed to an intake tract for the internal combustion engine, which is derived in an exhaust tract for the internal combustion engine.
  • the exhaust gas is thereby discharged at a removal point, which is arranged in the flow direction of the exhaust gas upstream of a turbine of an exhaust gas turbocharger for the internal combustion engine.
  • the discharged exhaust gas can flow through an exhaust gas recirculation cooler and thereby be cooled.
  • An amount of the exhaust gas leading to the intake tract can be adjusted by means of a valve device.
  • An internal combustion engine is known in which exhaust gas of the internal combustion engine is guided from an exhaust gas tract to an intake tract, wherein this exhaust gas can be cooled by means of a cooling device.
  • exhaust gas can be diverted in the flow direction of the exhaust both upstream and downstream of the turbine at respective removal points and via a respective Line system to an intake of the internal combustion engine feasible.
  • the exhaust gas is introduced into the intake tract, whereby a sucked by the internal combustion engine and the intake air flowing through the air is supplied with the exhaust gas.
  • An exhaust gas recirculation shown in this way keeps the emissions of the internal combustion engine, in particular particulate and nitrogen oxide emissions, low during internal combustion engine operation. Since two removal points are provided for discharging the exhaust gas, a particularly high amount of exhaust gas can be led to the intake tract.
  • the exhaust gas can be performed via different pressure gradient to the intake.
  • the amount of leading to the intake tract exhaust gas is very flexible adjustable and can be adapted to different operating points of the internal combustion engine and adapted to it.
  • the line systems provision is made for the line systems to be designed in such a way that a common, in particular only a single, common cooling device is used for cooling both the exhaust gas which is discharged in front of the turbine and behind the turbine. Although there are two extraction points for discharging the exhaust gas, only one cooling device is provided for cooling the exhaust gas. This leads to a low number of parts, to a low weight and in particular to low cost of an exhaust gas recirculation device of the motor vehicle.
  • a motor vehicle in which the piping systems are adapted to share a common, and in particular only a single, valve means for adjusting an amount of both the exhaust gas discharged in front of the turbine and behind the turbine.
  • the car has a low number of parts, a low weight and low costs.
  • the regulation or control of such a valve device represents a high cost, since the amount of exhaust tractable to the intake is adjustable, represents a high cost, since the amount of exhaust gas must be precisely adjusted and adapted to different operating points in the map of the internal combustion engine to represent a fuel consumption and low-emission operation.
  • the embodiment of the motor vehicle is combined with the common radiator device with the embodiment of the motor vehicle with the common valve device. This results in very low costs of the motor vehicle, since only one cooling device for cooling and only one valve device are provided for adjusting the amount of exhaust gas leading to the intake tract.
  • the motor vehicle comprises a bypass device, by means of which the common cooling device can be bypassed at least by a part of the discharged exhaust gas.
  • a bypass device by means of which the common cooling device can be bypassed at least by a part of the discharged exhaust gas.
  • a first exhaust gas recirculation line of the corresponding line system which is fluidically connected to the first removal point and provided with recirculation of the exhaust gas, is connected to a second exhaust gas recirculation line of the corresponding line system downstream of the removal points, which is fluidically connected to the second removal point and provided for recirculation of the exhaust gas common and provided for the return of the exhaust gas exhaust gas recirculation line fluidly communicating with each other out together.
  • the piping systems are at least partially merged to form a common piping system. This keeps the effort, the number of parts and thus the cost of the line system and thus for the entire car very low.
  • the common line system has a small space requirement.
  • the first and second exhaust gas recirculation lines are preferably combined via a valve device, in particular via a 3/2 valve, to the common exhaust gas recirculation line.
  • This valve device is, for example, a switchable, in particular controllable or controllable valve device.
  • This valve device makes it possible, for example, to supply only the exhaust gas to the common exhaust gas recirculation line, which is discharged at the removal point located behind the turbine.
  • the valve device can be switched to a specific position.
  • the common exhaust gas recirculation line by means of the valve device, to supply only the exhaust gas in a further position, which exhaust gas is discharged at the removal point located in front of the turbine.
  • a further possibility is to supply the common exhaust gas recirculation line with at least a portion of the exhaust gas discharged at the outlet point located in front of the turbine and at least a subset of the exhaust gas discharged at the outlet point located behind the turbine, so that exhaust gas discharged at the respective exhaust points in the common exhaust gas recirculation line is mixed.
  • a further degree of freedom is provided to set the temperature and the amount of exhaust gas to be led to the intake tract and a desired pressure gradient for guiding the exhaust gas to the intake tract.
  • the compressor compresses the intake air from the internal combustion engine, so that downstream of the compressor, a higher pressure level prevails than upstream of the compressor.
  • a higher pressure level prevails than upstream of the compressor.
  • the exhaust gas to be introduced into the intake tract at the corresponding inlet point has a higher pressure level than the air at this point of introduction.
  • the air is supplied with a certain amount of exhaust gas. In other words, it depends on the amount of pressure of the air and the amount of pressure of the exhaust gas, which amount of exhaust gas, the air is applied.
  • This embodiment thus provides great flexibility to apply exhaust gas to the compressed and / or uncompressed air and thus to realize a very efficient and low-emission operation of the internal combustion engine.
  • This pressure gradient is, for example beyond influenced and adjustable by an exhaust valve in the exhaust system and / or a throttle valve in the intake.
  • the exhaust flap is arranged, for example, downstream of the turbine and serves to narrow or release a flow cross-section of a corresponding piping, so that the exhaust accumulated in the piping and a higher exhaust back pressure is adjusted, from which a high pressure gradient results. This provides a further possibility to lead a particularly high amount of exhaust gas to the intake tract.
  • the throttle in the intake tract which is arranged downstream of the compressor, for example, in the flow direction of the air, by sucking or releasing a flow cross-section of a corresponding piping, the sucked air more or less dammed
  • a higher or lower pressure gradient for adjusting the amount of recirculating exhaust gas.
  • the exhaust gas recirculation power provided to the exhaust gas recirculates upstream of a discharge point into a first exhaust gas recirculation line fluidically connected to the first discharge point and provided for recirculation of the exhaust gas, and into a second exhaust gas recirculation line. branched fluidically connected to the second discharge point and provided for the return of the exhaust gas exhaust gas recirculation line.
  • the exhaust gas to be recirculated thus initially flows through the common exhaust gas recirculation line and is then divided by the branching, common exhaust gas recirculation line in order to be introduced into the intake tract at the corresponding point of introduction.
  • the exhaust gas recirculation line provided for the purpose of recirculating the exhaust gas branches via a valve device, in particular a 3/2 valve, into the first and the second exhaust gas recirculation line connected to the respective inlet points.
  • a valve device in particular a 3/2 valve
  • the exhaust gas recirculation line provided for the purpose of recirculating the exhaust gas branches via a valve device, in particular a 3/2 valve, into the first and the second exhaust gas recirculation line connected to the respective inlet points.
  • the invention also includes a method for operating an internal combustion engine, in which exhaust gas of the internal combustion engine is directed to a turbine of an exhaust gas turbocharger, wherein in the flow direction of the exhaust gas, both upstream and downstream of the turbine at respective tapping points Discharged exhaust and fed to an intake manifold for the internal combustion engine via a respective piping system.
  • both the exhaust gas derived before and also downstream of the turbine are cooled by means of a common cooling device and / or an amount of both the exhaust gas derived upstream of the turbine and that downstream of the turbine is adjusted by means of a common valve device.
  • a common cooling device and / or an amount of both the exhaust gas derived upstream of the turbine and that downstream of the turbine is adjusted by means of a common valve device.
  • the method is inexpensive to perform in terms of control effort, since only one valve device is to be controlled or regulated. In the method, it is not necessary to control two valve devices simultaneously and to match. This low control effort leads to low costs to carry out the process. Nevertheless, the method makes it possible to adapt the amount and the temperature of the recirculated exhaust gas very flexibly to different operating points in the characteristic map of the internal combustion engine and thus to realize an efficient and low-emission operation of the internal combustion engine.
  • Advantageous embodiments of the motor vehicle according to the invention are to be regarded as advantageous embodiments of the method according to the invention and vice versa.
  • the Fig. 2 shows the internal combustion engine 10 for a motor vehicle, from which exhaust gas of the internal combustion engine 10 is passed via corresponding lines of the exhaust tract 14 to the turbine 16 of the exhaust gas turbocharger 18.
  • the turbine 16 is designed as a turbine with variable turbine geometry and is driven by the exhaust gas led to it.
  • the turbine 16 drives the compressor 50 of the exhaust-gas turbocharger 18 arranged in the intake tract 38, which compresses the air drawn in by the internal combustion engine.
  • the exhaust gas recirculation line 74 can only exhaust gas from the exhaust gas recirculation line 68 or only exhaust gas from the exhaust gas recirculation line 66 are supplied. It is also possible, for example, for the exhaust gas recirculation line 74 to be supplied both with a specific amount of exhaust gas from the exhaust gas recirculation line 68 and with a certain amount from the exhaust gas recirculation line 66.
  • This merging of the exhaust gas recirculation lines 66 and 68 makes it possible to use only one exhaust gas recirculation cooler 40 'for cooling the exhaust gas to be led to the intake 38 and only one exhaust gas recirculation valve 42' for adjusting an amount of recirculated exhaust gas.
  • the common exhaust gas recirculation line 74 branches in the flow direction of the exhaust gas to be recirculated according to a directional arrow 76 upstream of the discharge points 42 and 63 into a first, connected to the first discharge point 43 exhaust gas recirculation return line 78 and a second, fluidically connected to the second discharge point 63 and the exhaust gas recirculation line 74 branches off via a switchable and optionally electrically actuatable 312 valve 82.
  • the 3/2 valve 82 makes it possible analogously to the 312 valve 72, the exhaust gas recirculation line 74 flowing exhaust either exclusively the exhaust gas recirculation line 78 or exclusively the exhaust gas recirculation line 80 zuzu meeting.
  • This flexible adjustment of exhaust gas recirculation rates is further enhanced by the optional arranged on the exhaust tract 14 exhaust valve 31 and disposed in the intake manifold 38 throttle valve 54, which is a pressure gradient between the recirculating exhaust gas and the intake air is adjustable by the exhaust gas and / or the air is more or less dammed in corresponding piping.
EP11004693A 2010-06-11 2011-06-09 Véhicule automobile et procédé de fonctionnement d`un moteur à combustion interne Withdrawn EP2395224A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010023524A DE102010023524A1 (de) 2010-06-11 2010-06-11 Kraftwagen sowie Verfahren zum Betreiben einer Verbrennungskraftmaschine

Publications (1)

Publication Number Publication Date
EP2395224A2 true EP2395224A2 (fr) 2011-12-14

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EP11004693A Withdrawn EP2395224A2 (fr) 2010-06-11 2011-06-09 Véhicule automobile et procédé de fonctionnement d`un moteur à combustion interne

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US (1) US20110302918A1 (fr)
EP (1) EP2395224A2 (fr)
DE (1) DE102010023524A1 (fr)

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WO2016102798A1 (fr) * 2014-12-22 2016-06-30 Renault S.A.S. Dispositif de recirculation des gaz d'échappement pour moteur à combustion interne de véhicule automobile
WO2016189028A1 (fr) * 2015-05-26 2016-12-01 Tenneco Gmbh Système rge présentant un filtre à particules et une soupape de décharge
FR3051843A1 (fr) * 2016-05-30 2017-12-01 Renault Sas Systeme de recirculation des gaz d'echappement pour un moteur a combustion interne d'un vehicule automobile
US20180347514A1 (en) * 2017-05-30 2018-12-06 Hanon Systems Exhaust gas recirculation system
WO2019001989A1 (fr) * 2017-06-30 2019-01-03 Volvo Truck Corporation Système de véhicule et procédé pour un tel système de véhicule
US10415513B2 (en) 2015-05-26 2019-09-17 Tenneco Gmbh EGR system with particle filter and wastegate
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WO2016102798A1 (fr) * 2014-12-22 2016-06-30 Renault S.A.S. Dispositif de recirculation des gaz d'échappement pour moteur à combustion interne de véhicule automobile
WO2016189028A1 (fr) * 2015-05-26 2016-12-01 Tenneco Gmbh Système rge présentant un filtre à particules et une soupape de décharge
US10415513B2 (en) 2015-05-26 2019-09-17 Tenneco Gmbh EGR system with particle filter and wastegate
US10502166B2 (en) 2015-05-26 2019-12-10 Tenneco Gmbh EGR system with particle filter and wastegate
FR3051843A1 (fr) * 2016-05-30 2017-12-01 Renault Sas Systeme de recirculation des gaz d'echappement pour un moteur a combustion interne d'un vehicule automobile
US20180347514A1 (en) * 2017-05-30 2018-12-06 Hanon Systems Exhaust gas recirculation system
WO2019001989A1 (fr) * 2017-06-30 2019-01-03 Volvo Truck Corporation Système de véhicule et procédé pour un tel système de véhicule
WO2019001730A1 (fr) * 2017-06-30 2019-01-03 Volvo Truck Corporation Système de véhicule et procédé destiné audit système de véhicule
US11255297B2 (en) 2017-06-30 2022-02-22 Volvo Truck Corporation Vehicle system and a method for such vehicle system
AT522052A1 (de) * 2019-09-17 2020-07-15 Avl List Gmbh Brennkraftmaschine
AT17008U1 (fr) * 2019-09-17 2021-02-15 Avl List Gmbh

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