• 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:

    公开号:SE1350004A1
    申请号:SE1350004
    申请日:2013-01-04
    公开日:2014-07-05
    发明作者:Fredrik Modahl；Henrik Håkansson Holst
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    15 20 25 30 For the remainder of this description, the designation 'EGR' fate 'will be used for the returned partial flow of the engine's total exhaust flow.
    Usually the EGR flow is returned to the inlet air by connecting an EGR line, usually designed as a smaller EGR pipe, connected to the exhaust side of the engine to a part of a line that leads the inlet air to the cylinders. Such a line for the inlet air is terminated with an inlet pipe (inlet manifold) attached to the engine and which comprises connection channels to the respective cylinders of the internal combustion engine and which connection channels are arranged along one side of the inlet pipe. Inlet cylinders are arranged for the cylinders which are opened to supply the respective cylinder with inlet air. A practical problem that exists when the EGR pipe is connected to such an inlet pipe is that there is a limited distance available for the mixture and it is usually not sufficient for the exhaust gases not to have time to mix efficiently before the mixture reaches the engine cylinders. Known embodiments mean that different cylinders are supplied with different proportions of exhaust gases in the inlet air depending on different distances between the point at which the exhaust gases are supplied and different cylinders.
    Examples of known technology showing different types of EGR systems will now be described.
    EP-2133548 relates to a gas mixing system in connection with an EGR system.
    The purpose is to improve the mixing of the recirculated exhaust gases in the air flow.
    This is achieved, among other things, by providing a mixing pipe with a number of openings through which the exhaust gases can pass.
    US-5957116 relates to an EGR tube adapted to be arranged in the air intake and comprises a plurality of holes through which the recirculated exhaust gases are discharged to the air flow.
    DE-10303569 describes an EGR system where the exhaust gases are returned to the inlet pipe via a mixing pipe which directs the exhaust gas flow in a direction opposite to the flow in the inlet pipe 10 before the exhaust gases are introduced into the inlet pipe via openings in the longitudinal wall of the mixing pipe the end.
    FR-2908471 refers to an EGR system where the exhaust gases are returned to the inlet pipe via a pipe with an increasing cross-sectional area in the flow direction. In a variant, the pipe is turned so that the exhaust gases are supplied to the inlet pipe in a direction opposite to the flow there.
    US-7389770 relates to an apparatus and method for supplying recycled exhaust gases. The device comprises an outlet portion with a number of outlets for the supply of exhaust gases and where the outlet portion has an outlet distance in the duct for incoming air. An object of this known device is to improve the distribution of the recirculating exhaust gases, which is achieved, among other things, by the outlets being spread in the longitudinal direction of the duct, but also distributed along a circumference of the outlet portion. It is also mentioned that the outlet portion may be located outside the duct for incoming air.
    In order to obtain optimal function of the EGR system, it is important that the EGR gases have time to have an even distribution in the air flow before they reach the inlet valves for the respective cylinders.
    Another wish of an EGR system is that the inlet pipe should be able to be connected in a simple manner to different types of connection lines for supplying air to the inlet pipe, which affects the design of the EGR injector.
    The connection lines often have different orientations in different applications and it is therefore desirable that the EGR injector should therefore be arranged on the inlet pipe in order to avoid adapting the connection lines so that the EGR injector can be arranged there.
    In view of the above, the object of the present invention is to provide an EGR system which contributes to a more even distribution of the EGR gases in the air flow in the inlet pipe. A further object is to design the EGR system so that different types of connection lines can be easily connected to the inlet pipe. Summary of the Invention The above objects are achieved by the invention defined by the independent claims. Preferred embodiments are defined by the dependent claims.
    According to the invention, the recirculating exhaust gases (EGR gases) are introduced into the flow of the inlet air via an EGR injector. The outlet part of the EGR injector is arranged upstream of the inlet air flow relative to the point of attachment of the inlet pipe and is located outside the inlet pipe. This achieves as long a mixing distance as possible without forcing specific changes to the connecting lines depending on different applications.
    The outlets for emissions of the EGR gases in the inlet line are located asymmetrically, in order to obtain a more even EGR distribution between the different cylinders.
    The outlet part extends outside the mouth of the inlet pipe a predetermined distance which is of the order of 50 mm, and this distance is determined essentially by the design of the parts to be connected to the mouth of the inlet pipe. The length of the protruding part of the EGR injector must therefore not be too long for different types of connecting parts to be able to be connected. This is therefore a contradictory desire in relation to bringing about as good a mixing of the exhaust air as possible, since this is achieved by allowing the EGR injector to emit the exhaust gases far from the first intake valve.
    BRIEF DESCRIPTION OF THE DRAWINGS Figs. 1a and 1b show a schematic cross-section along the longitudinal axis of the inlet pipe according to two embodiments of connection lines for the inlet air.
    Fig. 2 is a flow chart showing the method of the present invention.
    Fig. 3 is a perspective view illustrating an inlet pipe with an EGR system according to the present invention. Fig. 4 is a perspective view illustrating an inlet pipe with an EGR system according to the present invention where the connection line has been removed.
    Fig. 5 is a perspective view seen from the inlet end of an inlet pipe with an EGR system according to the present invention where the connection line has been removed.
    Fig. 6 is a side view of a part of the inlet duct with an EGR system according to the present invention where the connection line has been removed.
    Fig. 7 is a perspective view obliquely from above of a part of the inlet duct showing the EGR system according to an embodiment of the present invention.
    Figs. 8 and 9 are schematic top views showing two embodiments of the EGR system of the present invention.
    DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION In the figures, the same details, or details with a similar function, have consistently been given the same reference numerals.
    Exemplary embodiments of the invention will now be described in detail.
    Figures 1a and 1b schematically show a device for recirculating exhaust gases in a multi-cylinder internal combustion engine, i.e. a recirculating exhaust system (EGR system) 2. The internal combustion engine can be a multi-cylinder otto engine or a diesel engine. The device comprises an inlet pipe (inlet manifold) 4 for inlet air 6 intended to be supplied to the cylinders for the internal combustion engine. The inlet pipe has a substantially rectangular cross-sectional shape so that there are flat surfaces on its outside, but may in alternative embodiments have another cross-sectional shape, for example circular or square. The inlet pipe 4 has an inlet end 8. The inlet end is adapted to be connected to a connection line 9a, 9b through which air is supplied to the inlet pipe 4.
    The connection cable can have many different designs depending on the type of motor.
    Figure 1a shows an embodiment where the connection line 9a extends downwards in the figure, while figure 1b shows an embodiment where the connection line 9b extends upwards in the figure. Incidentally, the two embodiments are the same. Figure 3 shows both of these embodiments in the same figure, but the intention is that only one of the alternative embodiments should be present in one and the same embodiment. In other applications, the connecting line 9a, 9b may have other directions and it may, for example, be arranged parallel and concentric with the inlet pipe 4, or be more or less angled.
    The EGR system 2 further comprises an EGR injector 10 for supplying recirculating exhaust gases 12 to the inlet air 6 and adapted to be arranged in the inlet pipe 4 adjacent to the inlet end 8. The EGR injector 10 comprises an outlet part 14 comprising at least one outlet 16 for distributed supply of exhaust gases 12 and an end portion 18. An EGR line 22, sometimes referred to as an EGR tube, is adapted to carry the recirculating exhaust gases 12 to the EGR injector. The EGR line 22 has an inlet connected to the exhaust side of the engine and through which a partial flow of exhaust gases is diverted from its main flow. By outlet 16 is meant holes through a wall of the outlet part 14 through which outlets, or outlet holes, exhaust gases can pass out and be mixed with the inlet air 6.
    The outlet part 14 is adapted to carry recirculating exhaust gases 12 in a direction substantially opposite to the direction of the inlet air 6 in the inlet pipe 4 before the recirculating exhaust gases via the outlets 16 leave the outlet part and mix with the inlet air 6. The outlet part 14 is substantially outside the inlet 4.
    The outlet part 14 comprises a plurality of outlets 16 distributed in the longitudinal direction of the inlet pipe. By outside is meant that it extends substantially outside the inlet pipe 4 with still inside the connecting connection line 9a, 9b.
    This does not exclude that a smaller part of it or its outlet may be located inside the inlet pipe. Seen in the flow direction of the inlet air, the outlet part 14 is located substantially upstream of the inlet pipe 4.
    The connection lines 9a, 9b comprise upstream of what is shown in the figures in a manner known per se not shown air intakes, air filters, etc. according to what is commonly used in internal combustion engines. For some engines, these also include superchargers (turbochargers) and charge air coolers. In these cases, the part of the connecting line 9a, 9b which connects to the inlet pipe 4 is often referred to as a charging air pipe because the air therein has then passed both a supercharger and a charging air cooler.
    The outlets 16 are asymmetrically distributed along a circumferential direction of movement of the incoming air. The purpose of distributing the outlets in the longitudinal direction and asymmetrically along the mantle surface of the outlet part is to improve the mixing of the recirculated exhaust gases into the incoming air.
    According to one embodiment, the outlets 16 are asymmetrically distributed along the circumference in that most of the outlets are located along the half circumference. The asymmetrical distribution is clearly seen in Figure 7, where the outlets can be seen arranged on the right side of the outlet part 7. The fact that most outlets are arranged along half the circumference preferably means that more than 75% of the outlets are arranged there. The outlets are designed as round holes of the same size, which in a corresponding manner means that the total area of the outlets is also largest on one side of the outlet part. The outlets 16 are asymmetrically distributed in such a way that most of the outlets (largest total area of the outlets) are turned away from the side of the inlet pipe 4 where connection channels to the respective cylinders of the internal combustion engine are located. In Figures 3-7, the engine cylinders are located on the left or far side of the inlet pipe 4.
    According to one embodiment, the end part 18 is located on the outlet part 14, i.e. outermost end of the outlet part, a predetermined distance L outside the inlet end 8 of the inlet pipe 4. The end part should not protrude too far outside the inlet ends of the inlet pipe as it can then affect the possibility of mounting the connecting lines 9a, 9b. The predetermined distance is preferably in the range 40-60 mm, for example about 50 mm.
    For all embodiments it holds that said outlet part 14 can be a substantially circular-cylindrical pipe and that the outlets 16 are arranged in the wall of the pipe. Of course, other cross-sectional shapes are possible within the scope of the inventive concept, for example an elliptical cross-section, a square or a rectangular cross-section. The end portion 18 of the outlet portion 14 is preferably closed, i.e. there are no outlets there. The number of outlets is at most about 50 and the total area of the outlets 16 substantially corresponds to the cross-sectional area of the injector inlet end 20 of the EGR injector 10 (see Figure 1).
    According to one embodiment, the outlets 16 are substantially circular, but that other shapes are also possible, for example elongate outlets. In the case of circularly shaped outlets, they have a diameter of the order of 5-6 mm.
    According to one embodiment, the EGR injector 10 is a separate unit provided with a mounting collar 21, see e.g. Figures 6 and 7 at the injector inlet end 20. The mounting collar 21 is preferably attached to the outside of the inlet pipe 4 and is further connected to the EGR line 22 as for the recirculating exhaust gases 12 to the inlet pipe 4.
    Alternatively, the EGR injector 10 forms an integral part of said EGR line 22.
    The EGR injector is preferably made of stainless steel.
    Furthermore, the inlet pipe 4 must be provided with an opening 23 (see for example Figures 1, 8 and 9) in a wall where the EGR injector is mounted and through which opening the EGR injector introduces the recirculating exhaust gases 12 into the inlet pipe 4. The opening 23 may be located along a longitudinal central axis A1 (see Figures 8 and 9) of the inlet pipe 4. However, it may sometimes be advantageously in terms of construction to leave the opening 23 offset to the central axis A1 - In order to distribute the recirculated exhaust gases as efficiently as possible it is desirable that the outlet part 14 is as close to the center of the inlet pipe 4 as possible. In the embodiments schematically shown in Figures 8 and 9, two examples are given of how this can be achieved when the opening 23 is displaced in relation to A1 - 10 Figure 20 shows an embodiment in which the longitudinal central axis A2 of the outlet part 14 has an angle relative to the axis A1. The angle between A1 and A2 is preferably less than 20 °. Thereby, the outlets will be optimally located to achieve an efficient distribution of the recycled exhaust gases. Also in figure 7 it is clearly seen that the outlet part 14 is angled in relation to the longitudinal axis A1 of the inlet pipe 4.
    Figure 9 shows an embodiment where instead the EGR injector is angled so that the longitudinal axis of the outlet part 14 substantially corresponds to A1.
    Figure 3 is a perspective view illustrating an inlet pipe 4 in an EGR system 2 according to the present invention. The figure shows two alternative connection lines 9a, 9b connected to the inlet pipe 4, corresponding to what is shown in figures 1a and 1b.
    Figure 4 is a perspective view illustrating an inlet pipe 4 in an EGR system according to the present invention. Here, the connection line has been removed to illustrate how the EGR injector and its outlet part 14 are arranged and oriented in relation to the inlet pipe 4. Figure 5 is also a perspective view seen from the inlet end of an inlet pipe 4 with an EGR system according to the present invention where the connection line is taken. away.
    Here, among other things, a variant of the outlet part is shown where the outlet end 18 is closed.
    Figure 6 is a side view of a portion of the inlet pipe with an EGR system according to the present invention where the connection line has been removed. This figure shows, among other things, the fastening collar 21 which is used to fasten the EGR injector 21 to the inlet pipe 4 according to an embodiment.
    Figure 7 is a perspective view obliquely from above of a part of the inlet pipe showing the EGR system according to an embodiment of the present invention, which embodiment has also been discussed in connection with Figure 8. Referring to the fate diagram in Figure 2, a method for exhaust gas recirculation in an exhaust gas recirculation system (EGR system) to be described. The EGR system 2 conforms to the above described and thus comprises an inlet pipe 4 for incoming air 6 intended to be supplied to the cylinders for an internal combustion engine, the inlet pipe 4 having an inlet end 8. The EGR system 2 further comprises an EGR injector 10 for supplying recirculation exhaust gases 12 to the incoming air 6 and adapted to be arranged in said inlet pipe 4 adjacent to said inlet end 8, and that the EGR injector 10 comprises an outlet part 14 comprising at least one outlet 16 for distributed supply of exhaust gases 12 and an end part 18, and that the outlet part 14 is adapted to carry recirculating exhaust gases 12 in a direction substantially opposite to the direction of incoming air 6 in the inlet pipe 4.
    The method according to the invention comprises: supplying the exhaust gases 12 to the inlet air 6 outside the inlet pipe 4 by the outlet part 14 extending outside the inlet pipe 4, supplying the exhaust gases 12 to the inlet air 6 via a plurality of outlets 16 distributed in the outlet part 12 longitudinal air, and supplying the exhaust air 12 6 via a plurality of asymmetrically distributed outlets 16 distributed along the circumference of the outlet part 14.
    The said plurality of outlets are asymmetrically distributed along the circumference in that most outlets are located along half the circumference. Preferably, most outlets mean that more than 75% of the outlets are located along half the circumference.
    The present invention is not limited to the preferred embodiments described above. Various alternatives, modifications and equivalents can be used.
    The above embodiments are therefore not to be construed as limiting the scope of the invention as defined by the appended claims.
    权利要求:
    Claims (16)
    [1]
    An apparatus for recirculating exhaust gases in an internal combustion engine comprising an inlet pipe (4) intended to supply incoming air (6) to the cylinders of the internal combustion engine, the inlet pipe (4) having an inlet end (8), and an EGR injector (10) for recirculating exhaust gases (12) from the internal combustion engine to the incoming air (6) and arranged in said inlet pipe (4) adjacent to said inlet end (8) of the exhaust duct (4), the EGR injector (10) comprising an outlet part (14) comprising at least an outlet (16) for distributed supply of exhaust gases (12) to the incoming air (6), the outlet part (14) being arranged in a direction which is substantially opposite to the direction of incoming air (6) in the inlet pipe (4), characterized in that said outlet part (14) is arranged outside said inlet pipe (4), that said outlet part (14) comprises a plurality of outlets (16) distributed in the longitudinal direction of the outlet part (14), and that said plurality of outlets (16) are asymmetrical for divided along the circumference of the outlet part (14).
    [2]
    The device of claim 1, wherein said plurality of outlets (16) are asymmetrically distributed along the circumference of the outlet portion (14) in that most of the outlets (16) are located within an area bounded by half its circumference.
    [3]
    Device according to claim 1 or 2, wherein said most outlets comprise more than 75%.
    [4]
    Device according to any one of claims 1-3, wherein the inlet pipe along one side is formed with connections to the respective cylinders of the internal combustion engine and wherein said plurality of outlets (16) are asymmetrically distributed in such a way that the outlets (16) face away from the side of the inlet pipe (4) where the connections to the cylinders of the internal combustion engine are located.
    [5]
    Device according to any one of claims 1-4, wherein said end part (18) of the outlet part (14) is located a predetermined distance L outside the inlet end (8) of the inlet pipe. 10 15 20 25 30 12
    [6]
    The device of claim 5, wherein said predetermined distance is in the range of 40-60 mm.
    [7]
    A device according to any one of claims 1-6, wherein the EGR injector (10) comprises an injector inlet end (20), and wherein the EGR injector (10) is a separate unit provided with a mounting collar at said injector inlet end (20) attached to the outside of the inlet pipe (4).
    [8]
    A device according to any one of claims 1-6, wherein the EGR injector (10) comprises an injector inlet end (20), and wherein the EGR injector (10) at its injector inlet end (20) is connected to an EGR line (22) which for the recirculating exhaust gases (12) to the inlet pipe (4) and forms an integral part of said EGR line (22).
    [9]
    Device according to any one of claims 1-8, wherein the total area of the outlets (16) substantially corresponds to the cross-sectional area of the injector inlet end (20) of the EGR injector (10).
    [10]
    Device according to any one of claims 1-9, wherein said outlet part (14) is a substantially circular-cylindrical pipe and that the outlets (16) are arranged in the wall of the pipe.
    [11]
    A device according to any one of claims 1-10, wherein said outlets (16) are substantially circular.
    [12]
    Device according to any one of claims 1-11, wherein said inlet pipe (4) is provided with an opening in a wall, through which opening said EGR injector brings recirculating exhaust gases (12) into the inlet duct (4). 10 15 20 25 30 13
    [13]
    A method for recirculating exhaust gases at an internal combustion engine comprising an inlet pipe (4) through which the cylinders of the internal combustion engine are supplied with incoming air, and exhaust gases from the internal combustion engine are recirculated to the incoming air via an EGR injector with an outlet direction directed towards air and adapted in connection with an inlet end in said inlet pipe, the exhaust gases being supplied distributed via outlets arranged in the outlet part characterized by supplying the exhaust gases to the inlet air outside the inlet duct by the outlet part extending outside the inlet pipe to distribute the inlet pipe to the inlet pipe. in the longitudinal direction of the outlet part and to supply the exhaust gases to the inlet air via a plurality of asymmetrically distributed outlets distributed along the circumference of the outlet part.
    [14]
    The method of claim 13, wherein said plurality of outlets are asymmetrically distributed along the circumference in that most outlets are located along the half circumference.
    [15]
    The method of claim 14, wherein said most outlets comprise more than 75%.
    [16]
    The method according to any of claims 13-15, wherein the inlet pipe along one side is formed with connections to the respective cylinders of the internal combustion engine and wherein said plurality of outlets (16) are asymmetrically distributed in such a way that the exhaust gases are supplied to the inlet air to the side facing away from the connections to the engine cylinders.
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    同族专利:
    公开号 | 公开日
    EP2941558A4|2016-08-10|
    WO2014107126A1|2014-07-10|
    BR112015015193A2|2017-07-11|
    EP2941558A1|2015-11-11|
    EP2941558B1|2018-02-28|
    SE536919C2|2014-10-28|
    KR101795699B1|2017-11-08|
    KR20150097800A|2015-08-26|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE2622509A1|1976-05-20|1977-12-01|Ford Werke Ag|Auxiliary air or exhaust gas feed system - has tube with convergent and divergent jets to prevent fuel condensation in inlet manifold|
    JP2000054915A|1998-08-10|2000-02-22|Isuzu Motors Ltd|Egr device|
    DE19933030A1|1999-07-15|2001-01-18|Mann & Hummel Filter|Fluid introduction for a hot fluid in a cavity structure|
    SE522310C2|2001-03-02|2004-02-03|Volvo Lastvagnar Ab|Apparatus and method for supplying recycled exhaust gases|
    JP2003262164A|2002-03-07|2003-09-19|Denso Corp|Air intake device for internal combustion engine|
    FR2879262B1|2004-12-13|2007-04-06|Renault Sas|PLASTIC AIR DISTRIBUTOR FOR INTERNAL COMBUSTION ENGINE WITH RECIRCULATION OF EXHAUST GASES.|
    DE102007035556A1|2007-07-28|2009-01-29|Daimler Ag|Mixing apparatus for adding exhaust gas recirculation flow into charge air flow of internal-combustion engine, has connecting tube running transverse through passage channel and connecting inlet opening with one of chambers|
    EP2133548B1|2008-06-12|2019-06-12|Perkins Engines Company Limited|Gas Mixing system|
    US9080536B2|2011-02-24|2015-07-14|General Electric Company|Systems and methods for exhaust gas recirculation|GB2560743B|2017-03-23|2020-04-15|Jaguar Land Rover Ltd|Intake manifold with a secondary gas inlet|
    KR20200015967A|2018-08-06|2020-02-14|엘에스엠트론 주식회사|Engine for agricultural working machine|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1350004A|SE536919C2|2013-01-04|2013-01-04|Device for recirculating exhaust gases in an internal combustion engine|SE1350004A| SE536919C2|2013-01-04|2013-01-04|Device for recirculating exhaust gases in an internal combustion engine|
    PCT/SE2013/051513| WO2014107126A1|2013-01-04|2013-12-16|Arrangement for recirculation of exhausts at an internal combustion engine|
    KR1020157020009A| KR101795699B1|2013-01-04|2013-12-16|Arrangement for recirculation of exhausts at an internal combustion engine|
    EP13870300.4A| EP2941558B1|2013-01-04|2013-12-16|Arrangement for recirculation of exhaust gases at an internal combustion engine|
    BR112015015193A| BR112015015193A2|2013-01-04|2013-12-16|exhaust recirculation arrangement in an internal combustion engine|
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