EP2278148A1 - Moteur a combustion interne avec recirculation de gaz d'échappement et procédé de contrôle d'un tel moteur - Google Patents

Moteur a combustion interne avec recirculation de gaz d'échappement et procédé de contrôle d'un tel moteur Download PDF

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Publication number
EP2278148A1
EP2278148A1 EP09163475A EP09163475A EP2278148A1 EP 2278148 A1 EP2278148 A1 EP 2278148A1 EP 09163475 A EP09163475 A EP 09163475A EP 09163475 A EP09163475 A EP 09163475A EP 2278148 A1 EP2278148 A1 EP 2278148A1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
gas recirculation
internal combustion
combustion engine
line
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Withdrawn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
EP09163475A
Other languages
German (de)
English (en)
Inventor
Andreas Kuske
Christian Winge Vigild
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.)
Ford Global Technologies LLC
Original Assignee
Ford Global Technologies LLC
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 Ford Global Technologies LLC filed Critical Ford Global Technologies LLC
Priority to EP09163475A priority Critical patent/EP2278148A1/fr
Priority to CN2010102118283A priority patent/CN101929408A/zh
Publication of EP2278148A1 publication Critical patent/EP2278148A1/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Withdrawn legal-status Critical Current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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/42—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders
    • F02M26/44—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders in which a main EGR passage is branched into multiple passages
    • 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
    • F02M26/33—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 controlling the temperature of the recirculated gases
    • 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
    • F02M26/38—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with two or more EGR valves disposed in parallel
    • 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
    • F02M26/65—Constructional details of EGR valves
    • F02M26/72—Housings
    • F02M26/73—Housings with means for heating or cooling the EGR valve

Definitions

  • the invention relates to a method for operating such an internal combustion engine.
  • internal combustion engine includes diesel engines and gasoline engines, but also hybrid internal combustion engines.
  • the combustion process is influenced by so-called internal engine measures.
  • the focus is on reducing nitrogen oxide emissions, which are of particular relevance to diesel engines. Since the formation of nitrogen oxides not only an excess of air, but also When high temperatures are required, a concept for reducing nitrogen oxide emissions is to lower combustion temperatures.
  • the exhaust gas recirculation ie the return of combustion gases from the exhaust gas side to the intake side targeted, in which with increasing exhaust gas recirculation rate, the nitrogen oxide emissions can be significantly reduced.
  • Exhaust gas recirculation is also suitable for reducing emissions of unburned hydrocarbons in the partial load range.
  • a control element which is also referred to as an EGR valve, is provided in the exhaust gas recirculation line.
  • a continuously variable poppet valve is used as the EGR valve.
  • the recirculated exhaust gas can be supplied, for example, to a compressor and compressed, as a result of which the recirculated exhaust gas quantity can be increased.
  • a cooling device is provided, with which the recirculated exhaust gas is cooled before entering the at least one cylinder.
  • the cooling device lowers the exhaust gas temperature and thus increases the density of the exhaust gas, whereby the cooling device also contributes to a higher exhaust gas recirculation rate.
  • the exhaust gas recirculation is provided according to the prior art with a bypass valve, which allows bypassing the cooling device in the context of the recirculation of the exhaust gas and may be arranged upstream or downstream of the EGR valve in the return line.
  • the bypass valve is executed in two stages according to the prior art, which compared to a continuously variable element simplifies the control and offers cost advantages.
  • the bypass valve according to its two switching states provides only the two options, either completely pass the entire exhaust gas through the cooling device or to pass the entire exhaust gas to the cooling device, which is why the possibilities of influencing the temperature of the cylinder fresh charge are limited. Either the entire recirculated exhaust gas is cooled or all the recirculated exhaust gas is supplied to the cylinders uncooled.
  • the bypass valve completely closes the supply to the cooling device and releases a bypass line for the exhaust gas, with which the recirculated exhaust gas is guided past the cooling device.
  • the supply to the cooling device is opened and the bypass line is completely closed.
  • Another object of the present invention is to provide a method of operating an internal combustion engine of the type mentioned above.
  • the at least one exhaust gas line is to be regarded as belonging to the exhaust gas removal system and the at least one intake line belongs to the intake system.
  • the internal combustion engine according to the invention is equipped in contrast to the known from the prior art internal combustion engines with two independently controllable lines for exhaust gas recirculation, namely with a cooled and an uncooled exhaust gas recirculation.
  • each of these two exhaust gas recirculation has a control element for adjusting the amount of recirculated exhaust gas
  • the entire recirculated exhaust gas flow can be divided into a cooled and an uncooled partial exhaust gas flow, which is why the targeted setting of a specific temperature T AGR the total recirculated exhaust gas amount and thus the temperature T Zyl the Cylinder fresh charge can be made.
  • the temperature T AGR of the total amount of recirculated exhaust gas sets in the mixture of the two partial exhaust gas streams of different temperature and can be a theoretical temperature, if both partial streams are passed directly into the intake system, ie not merged before introduction into the intake system.
  • the first object of the invention is achieved, namely to provide an internal combustion engine with which the temperature T Cyl cylinder fresh charge by means of exhaust gas recirculation can be influenced to a greater extent than in the prior art.
  • An advantage of the internal combustion engine according to the invention is also the redundancy regarding the exhaust gas recirculation. If one of the two lines for exhaust gas recirculation fails due to failure, exhaust gas can continue to be recirculated by means of the remaining intact exhaust gas recirculation, because both exhaust gas recirculation systems are equipped with independently operable control elements.
  • the entire exhaust gas to be recirculated can also be completely passed through the cooling device or at the engine in the internal combustion engine according to the invention Cooler be passed over.
  • Cooler be passed over.
  • Embodiments of the internal combustion engine in which the first control element or the second control element is steplessly adjustable are advantageous.
  • the flow cross-section is infinitely variable. If both controls are infinitely adjustable, this offers the greatest possible freedom or diversity in the distribution of the exhaust gas flow to be recirculated.
  • the second control element is infinitely adjustable to dose the amount of recirculated exhaust gas as accurately as possible, ie to be able to set the return rate.
  • Infinitely adjustable controls also prove to be advantageous in the setting of a specific predetermined temperature T cyl cylinder fresh charge.
  • multi-stage adjustable control elements also solve the object underlying the invention, namely to make the temperature of the cylinder fresh charge by means of exhaust gas recirculation more controllable than is possible according to the prior art.
  • the flow cross-section can be gradually increase or decrease and consequently the guided through this flow cross-section exhaust gas in stages, d. H. change in more or less big steps.
  • Embodiments of the internal combustion engine in which the first control element or the second control element is electrically, hydraulically, pneumatically, mechanically or magnetically controllable, preferably by means of the engine control of the internal combustion engine, are advantageous.
  • Embodiments of the internal combustion engine in which the first control element or the second control element is a flap or a slide are advantageous.
  • a poppet valve is characterized by a - compared to other types - low leakage current.
  • Embodiments of the internal combustion engine in which the first control element is arranged downstream of the cooling device in the first line for exhaust gas recirculation are advantageous. According to this embodiment, the first control element flows through an already cooled exhaust gas flow.
  • a downstream control of the cooling device, d. H. EGR valve is thermally less heavily loaded, so that it may be possible to dispense with cooling of the EGR valve or less temperature-resistant and thus more cost-effective materials can be used to produce the valve.
  • embodiments of the internal combustion engine may also be advantageous in which the first control element is arranged upstream of the cooling device in the first line for exhaust gas recirculation.
  • a control provided upstream of the cooling device prevents the cooling device from being continuously, i. H. Even in operating conditions in which no exhaust gas is to be returned via cooling device in the intake system, hot exhaust gas is applied. It should be noted that the supply of exhaust gas into the cooling device leads to contamination of the cooling device and a control device provided upstream of the cooling device in the closed state prevents exposure to exhaust gas and thus contamination.
  • a major reason for the pollution is that exhaust components condense when flowing through the cooling device due to the decreasing exhaust gas temperature and are deposited on the inner walls of the cooling device.
  • the deposits lead to a narrowing of the flow cross sections and increase in this way the flow resistance of the cooling device for the exhaust gas flow.
  • the heat transfer and thus the cooling performance due to the pollution decrease.
  • the upstream of the cooling device provided control principle inherently with the uncooled, d. H. the hot exhaust gas is applied, it may be advantageous, if necessary, to cool this control.
  • the first control is equipped with a cooling, wherein the cooling may be a liquid cooling or air cooling.
  • the cooled control contributes to the overall cooling performance within the exhaust gas recirculation.
  • the control is to equip with coolant channels, which pass the coolant through the element.
  • the forming the liquid cooling walls are as large as possible form, to increase the heat transfer by convection, which can be done for example by the arrangement of cooling fins or cooling knobs.
  • the provision of the first control with a cooling allows the use of less temperature-resistant and thus more cost-effective materials for the production of the element.
  • the line of the first exhaust gas recirculation as such can also be cooled.
  • the line can be equipped with a liquid cooling, ie a coolant jacket surrounding the line or provided with ribs to increase the heat output due to convection.
  • the second control element can also be equipped with a cooling system.
  • it is the primary object of the second exhaust gas recirculation to recirculate hot or uncooled exhaust gas, i. Exhaust gas to lead past the cooling device, in particular embodiments of the internal combustion engine are advantageous in which the second control is an uncooled control.
  • the second exhaust gas recirculation is frequently used in operating states of the internal combustion engine in which the exhaust gas has a comparatively low temperature and cooling of the exhaust gas is not intended anyway, for example after a cold start or at low speeds or low loads.
  • embodiments of the internal combustion engine are advantageous in which the second line for exhaust gas recirculation is thermally insulated.
  • the thermal insulation contributes to the fact that as little heat is removed from the exhaust gas when flowing through the second line and the exhaust gas when exiting the second line has a high temperature, which is particularly favorable during the warm-up phase of the internal combustion engine.
  • the insulation thus supports the second exhaust gas recirculation in its original function, as hot as possible exhaust gas.
  • a measure to prevent the exceeding of the limit temperature is to limit the temperature of the recirculated exhaust gas by means of the second exhaust gas recirculation, ie to limit.
  • the omission of the thermal insulation provides for or supports an undisturbed heat transfer to the environment through heat conduction, convection and Thermal radiation and thus for a temperature reduction or temperature limitation in the exhaust gas.
  • Embodiments of the internal combustion engine in which the second line for exhaust gas recirculation branches off from the first line to the exhaust gas recirculation upstream of the cooling device are advantageous. This provides in a variety of applications for a shortening of the second line for exhaust gas recirculation compared to embodiments in which the second exhaust gas recirculation line - like the first line - branches off directly from the Abgasab conveysystem.
  • the shortening of the second line reduces the mass and the length and thus the thermal inertia of this line, which is effective in terms of minimizing heat losses.
  • the reduction of the exhaust gas surface of the return line reduces the heat transfer. Suitable materials can support this effect.
  • the proposed embodiment also supports a dense packaging in the engine compartment.
  • embodiments of the internal combustion engine are advantageous in which the second line for exhaust gas recirculation opens downstream of the cooling device in the first line for exhaust gas recirculation. A mixture of the exhaust gas streams of the two exhaust gas recirculation takes place before introducing the recirculated exhaust gas amounts in the intake system.
  • the two preceding embodiments are characterized in that a common line for exhaust gas recirculation branches off from the exhaust gas removal system and / or opens into the intake system.
  • the exhaust gas recirculations can be designed as high-pressure EGR or as low-pressure EGR. While the exhaust gas is extracted at a high pressure EGR upstream of the turbine, this occurs at the so-called low pressure EGR downstream of the turbine. This has the advantage that the recirculated exhaust gas flows through the turbine before the return and thus is available for the drive of the turbine. High EGR rates, d. H. Large amounts of recirculated exhaust gas then do not necessarily lead to a drop in the turbine pressure ratio and to a loss in the torque supply.
  • the second sub-problem underlying the invention namely to show a method for operating an internal combustion engine according to one of the aforementioned types, is achieved by a method which is characterized in that the first control element and the second control element are actuated in such a way that the temperature T cyl cylinder fresh charge does not exceed a predetermined limit temperature T limit.
  • FIG. 1 shows a first embodiment of the internal combustion engine 1 using the example of a four-cylinder in-line engine, the four along the cylinder head longitudinal axis, ie arranged in series cylinder 2 has.
  • the internal combustion engine 1 has an intake system 4, via which the cylinders 2 fresh mixture or recirculated exhaust gas is supplied and an exhaust discharge system 3 for discharging the combustion gases from the cylinders. 2
  • the internal combustion engine 1 is equipped with two exhaust gas recirculations 5, 9, namely a cooled exhaust gas recirculation 5 and an uncooled, d. H. hot exhaust gas recirculation 9, with which exhaust gas from the Abgasab Switzerlandsystem 3 is returned to the intake system 4.
  • the first exhaust gas recirculation 5 comprises a first line 6 for exhaust gas recirculation 5, which branches off from the Abgasab fossilsystem 3 and opens into the intake system 4 and in which a cooling device 8 is provided to cool the recirculated exhaust gas.
  • a first control element 7 is arranged in the first conduit 6 upstream of the cooling device 8, which is equipped with liquid cooling (not shown) and according to the circuit state in FIG FIG. 1 is closed, so that no cooled exhaust gas is returned.
  • the second control element 11 is uncooled and serves to adjust the amount of exhaust gas which is returned to the second exhaust gas recirculation 9. According to the circuit state in FIG. 1 the second control element 11 is opened, so that uncooled, ie hot exhaust gas is returned (double dashed line).
  • Both controls 7, 11 are formed as poppet valves.
  • the first line 6 and the second line 10 branch immediately adjacent to each other, d. H. at the same point directly from the Abgasablubsystem 3 and open separately from each other in the intake system. 4
  • FIG. 2 schematically shows a second embodiment of the internal combustion engine 1. It should only the differences from those in FIG. 1 Otherwise, reference will be made to FIG. 1 , The same reference numerals have been used for the same components.
  • the first control element 7 is arranged downstream of the cooling device 8 in the first line 6, so that the cooling device 8 is constantly exposed to exhaust gas during operation of the internal combustion engine 1, even if no cooled exhaust gas is returned.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
EP09163475A 2009-06-23 2009-06-23 Moteur a combustion interne avec recirculation de gaz d'échappement et procédé de contrôle d'un tel moteur Withdrawn EP2278148A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP09163475A EP2278148A1 (fr) 2009-06-23 2009-06-23 Moteur a combustion interne avec recirculation de gaz d'échappement et procédé de contrôle d'un tel moteur
CN2010102118283A CN101929408A (zh) 2009-06-23 2010-06-23 具有排气再循环的内燃发动机和所述类型的内燃发动机的操作方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09163475A EP2278148A1 (fr) 2009-06-23 2009-06-23 Moteur a combustion interne avec recirculation de gaz d'échappement et procédé de contrôle d'un tel moteur

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EP2278148A1 true EP2278148A1 (fr) 2011-01-26

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EP09163475A Withdrawn EP2278148A1 (fr) 2009-06-23 2009-06-23 Moteur a combustion interne avec recirculation de gaz d'échappement et procédé de contrôle d'un tel moteur

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CN (1) CN101929408A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2562407A3 (fr) * 2011-08-03 2013-06-19 MAN Truck & Bus AG Dispositif de récirculation des gaz d'échappement d'un moteur à combustion interne d'un véhicule et procédé de fonctionnement d'un dispositif de récirculation de gaz d'échappement

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109915287B (zh) * 2019-03-27 2020-06-02 潍柴动力股份有限公司 Egr气体温度控制方法及相关装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0849453A2 (fr) * 1990-11-06 1998-06-24 Mazda Motor Corporation Système de récirculation de gaz d'échappement pour un moteur à combustion interne
DE19924920A1 (de) * 1999-05-31 2000-12-07 Volkswagen Ag Vorrichtung und Verfahren zur Abgasrückführung an Verbrennungskraftmaschinen
DE102004057306A1 (de) * 2004-11-26 2006-06-01 Siemens Ag Verfahren zur Rückführung eines Teilstromes an Abgas zu einem Verbrennungsmotor eines Kraftfahrzeuges
US20070056266A1 (en) * 2005-09-13 2007-03-15 Eric Kurtz System and method for regenerating a NOx storage and conversion device
WO2008082540A2 (fr) * 2006-12-22 2008-07-10 Cummins Inc. Procédés, systèmes et appareils de commande d'un egr
FR2919026A1 (fr) * 2007-07-17 2009-01-23 Renault Sas Dispositif de reinjection des gaz d'echappement
US20090077968A1 (en) * 2007-09-25 2009-03-26 Ford Global Technologies, Llc Turbocharged Engine Control Operation with Adjustable Compressor Bypass

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2859503B1 (fr) * 2003-09-09 2010-04-09 Volkswagen Ag Retraitement du gaz d'echappement d'un moteur diesel a combustion interne comportant un filtre a particules
US7946117B2 (en) * 2006-12-15 2011-05-24 Caterpillar Inc. Onboard method of determining EGR flow rate

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0849453A2 (fr) * 1990-11-06 1998-06-24 Mazda Motor Corporation Système de récirculation de gaz d'échappement pour un moteur à combustion interne
DE19924920A1 (de) * 1999-05-31 2000-12-07 Volkswagen Ag Vorrichtung und Verfahren zur Abgasrückführung an Verbrennungskraftmaschinen
DE102004057306A1 (de) * 2004-11-26 2006-06-01 Siemens Ag Verfahren zur Rückführung eines Teilstromes an Abgas zu einem Verbrennungsmotor eines Kraftfahrzeuges
US20070056266A1 (en) * 2005-09-13 2007-03-15 Eric Kurtz System and method for regenerating a NOx storage and conversion device
WO2008082540A2 (fr) * 2006-12-22 2008-07-10 Cummins Inc. Procédés, systèmes et appareils de commande d'un egr
FR2919026A1 (fr) * 2007-07-17 2009-01-23 Renault Sas Dispositif de reinjection des gaz d'echappement
US20090077968A1 (en) * 2007-09-25 2009-03-26 Ford Global Technologies, Llc Turbocharged Engine Control Operation with Adjustable Compressor Bypass

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2562407A3 (fr) * 2011-08-03 2013-06-19 MAN Truck & Bus AG Dispositif de récirculation des gaz d'échappement d'un moteur à combustion interne d'un véhicule et procédé de fonctionnement d'un dispositif de récirculation de gaz d'échappement
RU2602021C2 (ru) * 2011-08-03 2016-11-10 Ман Трак Унд Бас Аг Устройство рециркуляции отработавшего газа для двигателя внутреннего сгорания автомобиля, а также способ эксплуатации устройства рециркуляции отработавшего газа

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