• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The exhaust gas recirculation cooler has multiple cooling pipes, which are fitted with channels for cooling and directing exhaust gas recirculation gases from inlet ports to outlet openings of the respective channel. A transfer pipe is arranged parallel to the remaining cooling pipes for transferring the pulse energy occurring in the exhaust gas recirculation gases. The transfer pipe has a transmission channel having an inlet and an outlet.
    公开号:SE1150901A1
    申请号:SE1150901
    申请日:2011-09-30
    公开日:2013-03-31
    发明作者:Dennis Konstanzer
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    EGR cooler and internal combustion engine with such an EGR cooler.
    BACKGROUND OF THE INVENTION AND KNOWLEDGE TECHNOLOGYThe present invention relates to an EGR cooler according to the preamble of claim 1. InventiveThe invention also relates to an internal combustion engine with such an EGR cooler.
    EGR systems are used in exhaust gas purification for petrol and diesel engines. Nitrogen oxides are formed when the nitrogen and oxygen in the air react at the high temperatures and pressurescomes in the engine's combustion chamber. EGR, which is an abbreviation of the English term exhaust gas recirculation, meant that the engine's exhaust gases are led back to the engine's inlet side. The returned exhaust gases will lower the combustion temperature in the engine's combustion chamber, which means that the formation of nitrogen oxides is reduced. On turbocharged engines there are so-called long and short EGR systems. In shortthe system is connected to the inlet side downstream of the supercharger compressor, and usuallyalso downstream a charge air cooler, with the exhaust side in front of the supercharger's turbine. Thus, the EGR system will be connected between the high pressure side of the compressor and the high pressure side of the turbine. In the case of the long system, on the other hand, the EGR system is arranged between the engine inlet side before the compressor and on the exhaust side after the turbine.
    An advantage of using the short EGR system is that the lines can be made significantly shorter than for the long system and thus that the space requirement for the lines for the EGR system is reduced. This also reduces the weight of the EGR system. The disadvantage of this kanda system, however, is the similarity to in all combustion enginescombustion chambers obtain a homogeneous and uniform mixture of exhaust gases from the EGRthe system and the inlet air from the compressor. In the case of a non-uniform mixture, the combustion ratio in the different combustion chambers of the engine will be different, which means that the effect of each piston acting on the engine's crankshaft will be different. This in turn leads to the emissions in the engine exhaust 'Aar. The reason why it is black tomaintain a homogeneous and uniform mixture of exhaust gases from the EGR system and the inletthe air from the compressor is the short distance from the position where the EGR system is connected downstream of the charge air cooler for the inlet air and the respective combustion chamber2position. The result is that the exhaust gases and the inlet air have black to have time to mix homogeneously in the short rudder system between the above-mentioned positions.
    This disadvantage does not exist in the long system where the long wires are involvedthat the exhaust gases have time to mix with the inlet air before the mixture is fed to the enginedifferent cylinders.
    In order to increase the amount of exhaust gases that can be returned, an EGR cooler is usually arranged in the EGR system, so that the exhaust gases are cooled before they are supplied with the inlet air. The EGR cooler in-comprises a number of substantially parallel cooling tubes, each of which is provided with a channelthrough which the exhaust gases pass. Cooling fluid flows around the radiator rudder, which dissipates heat from the exhaust gases in the radiator rudder in the event that the EGR cooler is cooled in liquid. The EGR cooler can also be cooled by air which is then similarly led around the cooling ducts.
    The document EP-B2-1367253 shows an EGR cooler which is part of an EGR system. Cold-The purifier comprises several cooling tubes, each of which is formed with channels for conducting and cooling EGR gases from an inlet opening to an outlet opening of the respective channel. In the event that the exhaust gases are not to be cooled, which may be relevant during certain operating conditions, the exhaust gases can be led through a bypass duct, which extends along the radiator radiatorclean. A valve can be provided to direct the exhaust gases slightly through the cooling pipes ornom bypass channels.
    The exhaust gases from a piston engine leave the combustion chamber at the blow-out rate with an overpressure, which causes the pressure in the engine's exhaust system to pulsate, which in turncauses the exhaust flow to pulsate. Since the EGR system is connected to the engine exhaustsystem, the exhaust pressure and Nide in the EGR system will vary and damned pulsate. The EGR cooler will equalize the pressure and flow variations of the exhaust gases as it passes through the channels in the radiator tubes, resulting in a substantially even flow of the exhaust gases downstream of the EGR cooler without pressure variations and without pulses.3SUMMARY OF THE INVENTIONThe object of the present invention is to provide an EGR cooler which contributes to a homogeneous and uniform mixture of EGR gases and the inlet air of a combustion gas.engine.
    A further object of the invention is to provide an internal combustion engine with an EGR system, in which the internal combustion engine a homogeneous and uniform mixtureof EGR gases and inlet air are obtained in the combustion engine's combustion chamber.
    These objects are achieved with an EGR cooler of the kind mentioned in the introduction, which can be characterized by the features stated in the characterizing part of claim 1.
    These objects are also achieved with an internal combustion engine of the initially mentioned type.by arranging such an EGR cooler in the EGR system of the internal combustion engine.
    By providing the EGR cooler with at least one transport & for transport of pulse energy present in the EGR gases, a homogeneous and uniform mixture of EGR gases and inlet air is obtained in all combustion chambers of the internal combustion engine. Ddrmed er-maintains a substantially uniform effect from the respective piston on the engine crankshaft, whichcauses the performance of the internal combustion engine to increase and the emissions of the engine exhaust.
    Further advantages of the invention will become apparent from the following detailed description.
    BRIEF DESCRIPTION OF THE DRAWINGSIn the following, by way of example, preferred embodiments of the invention are described with reference to the accompanying drawings, in which:Fig. 1 shows a schematic view of a vehicle 1, which comprises a combustionengine with an EGR cooler according to the present invention,4Fig. 2Fig. 3Fig. 4Fig. Shows a schematic view of an internal combustion engine with an EGR cooler according to the present invention,shows a sectional view of an EGR cooler according to the present invention,shows a cross-sectional view through the EGR cooler along the line A - A in Fig. 3, and shows a sectional view of an EGR cooler according to an alternative embodiment.
    DETAILED DESCRIPTION OF THE INVENTIONFig. 1 schematically shows a vehicle 1, which comprises an internal combustion engine 2 providedwith an EGR system 22. The internal combustion engine 2 is further connected via a gearbox 6 and a transmission to the drive wheel 8 of the vehicle 1. Preferably, the internal combustion engine 2 is a multi-cylinder piston engine with compression gearing like a diesel engine. The EGR system 22 is arranged to return exhaust gases from the combustion tothe inlet of the internal combustion engine 2 to reduce the formation of nitrogen oxides.
    Fig. 2 shows a schematic view of the internal combustion engine 2. According to the embodiment shown, the internal combustion engine 2 has four cylinders 10, each cylinder accommodating a piston 12 and a combustion chamber 14. The engine 2 also has an output shaft 16 for combustion.bound to the gearbox 6. The internal combustion engine 2 comprises an inlet system 18 forsupply air to the combustion chambers 14 and an exhaust system 20 for removing exhaust gases from the combustion chambers 12. The inlet system 18 and the exhaust system 20 are connected to each other via the EGR system 22. An EGR valve 24 is arranged therein which controls the amount of exhaust gases supplied to the inlet system 18. The EGR system further comprises aEGR cooler 4 for cooling the exhaust gases returned to the inlet system 18. EGR-the system 22 is connected to the inlet system 18 downstream, seen in the flow direction of the exhaust gases, the EGR cooler 4 arranged in the EGR system 22 at a connection point 26 where the EGR gases are supplied to the air in the inlet system 18. The EGR system 22 is connected to the inlet system 18 downstream of compressor 28 input in a turbo-unit and downstream a charge air cooler 30 for the inlet air. Thus, the EGRthe system 22 connected on the high pressure side of the compressor 28. The EGR cooler 4 is connectedto a cooling system 32 of the engine 2 and supplied according to the embodiment showncooling water through a cooling water inlet 34. Cooling water leaves the EGR cooler 4 through a cooling water outlet 36. In alternative embodiments it is possible to cool the EGR cooler 4 with ambient air, which is supplied through the speed wind when the vehicle 1 is in motion and / or through a flat. The charge air cooler 30 is preferably cooled by an air cooling system.The compressor 28 is driven according to the exemplary embodiment shown by the output of the motor 2.through a turbine 29 arranged in the exhaust system 20, which also enters the turbocharger. The inlet system 18 is preferably constructed of conduits in the form of tubes and hoses 38, which transport the sucked in ambient air from an inlet opening 40 through the compressor 28, the charge air cooler 30 and finally to the combustion engine 2.The exhaust system 20 is preferably constructed of conduits in the form of tubes 42,which transports the hot exhaust gases from the combustion chamber 14 of the internal combustion engine 2 past the EGR valve 24, through the turbine 29 and further out to the environment via an exhaust pipe opening 44 and / or, where applicable, to additional components in the exhaust system such as evaporators, particulates, catalyst and / or Otherexhaust gas treatment components. The EGR system 22 is also made up ofin the form of tubes 46 which transport the exhaust gases from the EGR valve 24, through the EGR cooler 4 and on to a coupling device 48 at the connection point 26 where the EGR gases are supplied to the air in the inlet system 18. The EGR gases are thus supplied and mixed with the inlet air at the connection point 26 and is passed on in the inlet system18 to a branch point 47 where the mixed EGR gases and the inlet airenters an inlet pipe 49, which leads the mixed EGR gases and the inlet air on to resp. combustion chamber 14. The distance between the connection point 26 and the branch point 47 is relatively short and is in practice between 0 mm - 500 mm, preferably between 100 mm - 250 mm, for a diesel engine in a heavier vehicle.
    This is a distance that is usually considered too short to allow for full satisfactionmixture of EGR gases and the inlet air.
    Fig. 3 shows a sectional view of the EGR cooler 4, which comprises a plurality of parallel and uniform cooling tubes 50. Each cooling tubes 50 is formed with a channel 52 forconducting and cooling EGR gases from an inlet port 54 to an outlet port 56 of therespective duct 52. The ducts 52 have a shape which allows a large contact area with the exhaust gases flowing in the ducts 52. The EGR cooler 4 is supplied with cooling water through the cooling water6kein inlet 34 which after passage through the EGR cooler is removed via the cooling water outlet 36. The cooling liquid is allowed to surround the respective cooling tubes 50, so that the heat from the cooling tubes 50 can be transported away with the cooling liquid. The EGR cooler 4 is surrounded by a housing 58, which houses the cooling tubes 50. In the housing 58, the cooling water inlet 34 and the cooling water outlet 36 arearranged. The housing 58 also has an exhaust inlet 60 and an exhaust outlet 62.
    Since the internal combustion engine 2 is a piston engine, the pressure in the exhaust system 20 of the engine 2 will vary and pulsate depending on how its exhaust valves are opened and closed, which in turn causes the exhaust flow to vary and pulsate. Since the EGR system 22is connected directly to the engine 2 exhaust system 20, the exhaust pressure and Bade inEGR system 22 to vary and damned pulsate. When using a conventional EGR cooler, one will essentially equalize the pulsating Wide to a substantially even Wide. However, in order to avoid that the EGR cooler 4 in this way equalizes the pressure and flow variations of the exhaust gases when the exhaust gases pass through ducts.52 in the radiator tubes 50 is the EGR cooler 4 shown, unlike conventional onesEGR cooler, designed with at least one of the cooling tubes with a special design. In order to distinguish this cooling tube from the others, this cooling tube is still referred to as transport tube 64, which, like other cooling tubes, is surrounded by the same cooling liquid as the other cooling tubes 50, and which at least to some extent cools the flowing exhaust gases.na. In addition, the transport tube 64 is used for the transport of substances present in the EGR gases.the pulse energy from the EGR cooler inlet to its outlet. The transport pipe 64 is arranged substantially parallel to the other cooling pipes 50. The transport pipe 64 thus contributes to the exhaust gas pressure and Wide varying and pulsating the life downstream of the EGR cooler 4 and breathing until they are mixed with the inlet air. The occurrence in the EGR gasesThe pulse energy contributes damned to a good mixing effect of EGR gases and air inthe inlet system, and so that a homogeneous and uniform mixture of EGR gases and inlet air in all the combustion engine 14 of the internal combustion engine 2 is obtained. Thereby a substantially uniform effect is obtained from all the cylinders 10 of the engine 2, which means that the performance of the internal combustion engine 2 and the emissions of the exhaust gases of the engine 2 are reduced. Onedisadvantage of such a conveyor tube 64 is that the exhaust gases transported through itdo not receive as good a cooling as the exhaust gases passing through the other752. For this reason, the transport tube 64 should not be dimensioned larger than what is required to achieve an acceptable intended effect.
    The transport liner 64 comprises a transport channel 66, which has an inlet 68 and an outlet70, which inlet 68 is arranged in one with the inlet openings 54 of the channels 52 ofthe radiator tubes 50 substantially in common first plane 72 and which outlet 70 is arranged in a substantially common second plane 74 with the outlet openings 56 of the channels 52 of the radiator tubes 50. Thereby a good flow of exhaust gases through conveyor tubes 64 and radiator channels 50 is obtained. The transport channel 66 has a substantially slat interior 76along its entire extent, which results in a laid flow resistance. The other coolingthe channels 52, on the other hand, can in a conventional manner be formed with indentations and bulges and similar surface-enlarging shapes which result in good heat transfer. The transport guide 64 and thus the transport channel 66 is substantially straight and has a substantially circular cross-section, all this in order to, with the greatest effect and minimal error,transmit the pulse energy of the exhaust gases through the EGR cooler. However, the transport tube canexhibit an arbitrary shape seen in the cross-sectional direction.
    Fig. 4 shows a cross-sectional view through the EGR cooler along the line A - A in Fig. 3. The cooler tubes 50 are arranged so as to substantially surround the transport tube 64. Thus, the pulsethe exhaust gases with minimal losses are transferred through the EGR cooler 4. TheFig. 4 shows that the cooling tube 50 together with the transport tube 64 forms a matrix 78. The cooling tube 50 has a square cross-section in Fig. 4. However, the radiator tubes can have an arbitrary shape, for example a circular cross-sectional shape. It also appears that the conveyor tube 64 has a substantially larger cross-sectional area in comparison with the respective cooling tubes 50. Thissize ratio can, however, be arbitrary. According to advantageous embodiments barthe transport channel 66 of the conveyor tube 64 has a cross-sectional area of less than 10% of the total cross-sectional area of the other cooling channels 52 of the EGR cooler, and a ratio between 1 and 5% is particularly advantageous. It is most advantageous in the vicinity of 1% and it should preferably not exceed 3%. In all embodiments, however, the cross-sectional arena ofthe gate channel 66 is a cross-sectional area for some of the other channels 52,at least 10 times larger, and completely at least 25 times stone.8It can be pointed out that the transport channel 66 does not contain a flake valve or any other controllable means for regulating the flow through it. Its dimensions are thus predetermined during manufacture, which also means that its river capacity is predetermined.
    In the exemplary embodiment shown, only one conveyor tube 64 is shown. However, any number of conveyor tubes 64 can be arranged in the EGR cooler 4. The cross-sectional areas specified in the description example above for the transport channel must in these cases be interpreted to refer to the total cross-sectional area as all transport channels. Even an arbitrary numbercooling tubes 50 can be arranged in the EGR cooler 4. As shown in Fig. 3 and Fig. 4, the transport tubesThe tube is arranged centrally in the EGR cooler and when it has a circular cross-sectional shape, the transport tube is arranged concentrically at its center. By simultaneously arranging the EGR cooler exhaust inlet 68 and exhaust outlet 62 centrally and concentrically with the EGR cooler, as shown in Fig. 3, the exhaust pulses can pass through the EGR without redirection.cooler 4 with minimum monthly flow resistance. This means that the transport channel66 cross-sectional area can be kept down and that only a small proportion of the EGR gases need to be passed through the transport channel 66. This means that the transport tube 64 only the EGR cooler 4. If the EGR cooler 4 inlet 68 and outlet 70 are located in other positions, it may be advantageous.It is possible to arrange the transport channel 66 as centrally to these as possible instead ofarrange it in the center of the EGR cooler.
    Fig. 5 shows an EGR cooler according to an alternative embodiment. Fig. 5 shows in the same way as Fig. 3 a sectional view of an EGR cooler 4 where the flow resistance through theport channel 64 has been further reduced. In this case, the transport tube extends 64 paits inlet side into an exhaust pipe 90 connected to the exhaust inlet 60 of the EGR cooler 4 and on its outlet side into an exhaust pipe 92 connected to the exhaust outlet 62 of the EGR cooler 4. In this way the transport pipe 64 at the inlet of the EGR cooler 4 is arranged so as to extend upstream of the inlet openings 54 for the cooling ducts 52, and in a corresponding mannerthe transport tube 64 arranged at the outlet of the EGR cooler 4 so that it extends downwardsthe outlet openings 56 from the cooling ducts 52. In this way, the pulses present in the exhaust gases in the exhaust pipe 90 will not be subjected to the pressure change which9caused by the expansion to which they are subjected before they are introduced into the respective cooling ducts 52. In the same way, the exhaust gases in the transport duct 64 are not subjected to the contraction to which the exhaust gases from the cooling ducts 52 are subjected after they have passed the cooling ducts. The exhaust gases can then pass through the transport channel 64 substantially without pressure reduction. Most for-in this way, the transport channel 64 is arranged both at the EGR cooler 4inlet and outlet, but in alternative embodiments, the transport channel 64 can only be arranged at the inlet or outlet in this way, while the other part is designed in accordance with what is described with reference to Fig. 3.
    In addition to the components described, the EGR system may further comprise kanda in itselfcomponents such as a valve-controlled bypass line which, when there is no need for cooling, can transport the EGR gases past the EGR cooler. According to the description example above, the cooling medium consists of a cooling liquid, but the invention can of course be used correspondingly with air or other medium as cooling medium. According toIn the above example, the transport duct is arranged as a cooling duct, which makes it possiblea simple installation and at the same time allows cooling of the EGR gases that pass through the same. In alternative embodiments, the transport duct can be arranged as a completely external duct, for example through external pipelines, which connects the transport duct to an exhaust duct from the engine before and after the EGR cooler. Even in onesuch an embodiment, the transport channel is thus arranged parallel to the cooling channels.
    In such an embodiment, the EGR gases do not need to be subjected to flake cooling during their passage through the transport channel. What is essential in all embodiments is that the transport channel is designed with as few hooks and as few area changes as possible, since these reduce the pressure pulses.10
    权利要求:
    Claims (1)
    [1]
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    类似技术:
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    同族专利:
    公开号 | 公开日
    SE537803C2|2015-10-20|
    DE102012019254A1|2013-04-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    ES2209618B1|2002-05-28|2005-08-16|Estampaciones Noroeste, S.A.|HEAT EXCHANGER FOR AN "EGR" SYSTEM WITH AN INTEGRATED DERIVATION CONDUCT.|
    DE10260251A1|2002-12-20|2004-07-01|Siemens Ag|Cooling element for gases|
    FR2921426B1|2007-09-20|2014-02-14|Renault Sas|METHOD FOR DIAGNOSING THE EXCHANGER DERIVATION FLAP IN AN EXHAUST GAS RECIRCULATION SYSTEM|
    DE102008056810B4|2008-11-11|2011-11-24|Pierburg Gmbh|Cooling device for an internal combustion engine|
    法律状态:
    2021-06-01| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1150901A|SE537803C2|2011-09-30|2011-09-30|EGR cooler and internal combustion engine with such EGR cooler|SE1150901A| SE537803C2|2011-09-30|2011-09-30|EGR cooler and internal combustion engine with such EGR cooler|
    DE102012019254A| DE102012019254A1|2011-09-30|2012-09-28|Exhaust gas recirculation cooler for cooling exhaust gas recirculation gases in internal combustion engine, has transfer pipe, which has transmission channel having inlet and outlet|
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