• 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 invention relates to an internal combustion engine (1) with several cylinders (21, 22, 23, 24) with an intake system (3) and an exhaust system (4), as well as an exhaust gas recirculation system (5) for recirculating exhaust gas from the exhaust system (4) in the intake system (3), wherein the exhaust gas recirculation system (5) has at least one exhaust gas recirculation flow path (50) in which at least one exhaust gas cooling device (8) with at least one exhaust gas cooler (80; 81, 82, 83, 84) is arranged. In order to achieve an even distribution of the condensate to the individual cylinders, it is provided that the exhaust gas recirculation flow path (50) in or upstream of the exhaust gas cooling device (8) is divided into partial exhaust gas flows and the partial exhaust gas flows for cylinder-selective exhaust gas recirculation in cylinder-selective exhaust gas recirculation paths (51, 52, 53 , 54), with each cylinder (21, 22, 23, 24) being assigned at least one cylinder-selective exhaust gas recirculation path (51, 52, 53, 54) which enters an inlet flow path (31, 32, 33, 34) of the assigned cylinder (21, 22, 23, 24) or opens directly into the associated cylinder (21, 22, 23, 24).
    公开号:AT523180A4
    申请号:T51098/2019
    申请日:2019-12-16
    公开日:2021-06-15
    发明作者:Obenaus Ing Thomas；Schnider Ing Wolfgang
    申请人:Avl List Gmbh；
    IPC主号:
    专利说明:

    The invention relates to an internal combustion engine with several cylinders, an intake system, an exhaust system and an exhaust gas recirculation system for recirculating exhaust gas from the exhaust system into the intake system, the exhaust gas recirculation system having at least one exhaust gas recirculation flow path in which at least one exhaust gas cooling device with at least one exhaust gas cooler is arranged.
    Internal combustion engines with different exhaust gas recirculation devices
    and systems are known in the art. It has been shown that the fuel efficiency of a vehicle can be increased by using exhaust gas recirculation. In order to reduce emissions, various systems have been introduced in recent years that can be used to improve the exhaust gas
    Combustion is returned cylinder-selectively.
    WO 2014/140150 A1 describes an internal combustion engine with a plurality of cylinders with an exhaust gas recirculation path having an exhaust gas cooler between the exhaust system and the intake system. Downstream of an electric compressor and downstream of an exhaust gas cooler, the exhaust gas recirculation path is divided into individual cylinder-selective supply channels, with at least one supply channel opening into an inlet flow path for each cylinder. Another cylinder-selective exhaust gas recirculation device is known from DE 10 2007 033 675 A1.
    When recirculated exhaust gas is cooled, condensate is produced, which is usually separated off and stored in an intermediate storage device. From the
    From DE 10 2015 200 706 A1 it is known to feed this stored condensate to the fresh gas tract or to inject the condensate into the combustion chamber of the internal combustion engine. The aim is, on the one hand, to reduce the tendency to knock and, on the other hand, to reduce high exhaust gas temperatures. Similar arrangements are also described in the publications
    DE 10 2016 205 666 A1, DE 10 2016 207 189 A1, EP 2 998 560 A1,
    US 9,145,850 B2 or WO 2009/045154 A1.
    The known solutions have the disadvantage that without controlled further processing of the condensate - e.g. by pumping or
    Volume distribution devices - the even supply of condensate to
    the individual cylinders is not guaranteed. It can happen that individual cylinders are oversupplied with condensate, while others are undersupplied. The provision of pumps and other processing devices
    drives up costs and leads to disadvantages in packaging.
    It is therefore the object of the invention to achieve uniform distribution in the simplest possible way in an internal combustion engine with an exhaust gas recirculation system
    of the condensate to the individual cylinders.
    Based on an internal combustion engine of the type mentioned, this object is achieved according to the invention in that the exhaust gas recirculation flow path in or upstream of the exhaust gas cooling device is divided into partial exhaust gas flows and the partial exhaust gas flows for cylinder-selective exhaust gas recirculation are routed in cylinder-selective exhaust gas recirculation paths, with each cylinder being assigned at least one cylinder-selective exhaust gas recirculation path. which opens into an inlet flow path of the associated cylinder or directly into the associated cylinder. The cylinder-selective exhaust gas recirculation paths are preferably parallel
    flows through.
    One embodiment of the invention provides that the exhaust gas cooling device has several exhaust gas coolers, at least one exhaust gas cooler being assigned to each exhaust gas recirculation path, and the exhaust gas recirculation flow path being divided into the parallel flow through cylinder-selective exhaust gas recirculation paths upstream of the exhaust gas cooler. In other words, at least one exhaust gas cooler is operatively connected to each exhaust gas recirculation path. So that becomes in that
    Exhaust gas recirculation path cooled exhaust gas by the exhaust gas cooler.
    In another embodiment of the invention it is provided that the exhaust gas cooling device has an exhaust gas cooler with a - preferably arranged in the region of an exhaust gas inlet in the exhaust gas cooler - distributor space, the exhaust gas cooler between the distributor space and an exhaust gas outlet region from the exhaust gas cooler has several flow channels, the individual flow channels are separated in terms of flow. In each case one flow channel is preferably assigned to a cylinder-selective exhaust gas recirculation path, the assigned cylinder-selective exhaust gas recirculation path in the exhaust gas outlet area
    Exhaust gas cooler proceeds from this associated flow channel.
    Alternatively, a further embodiment of the invention provides that a group of at least two flow channels is assigned to a cylinder-selective exhaust gas recirculation path and the assigned cylinder-selective exhaust gas recirculation path in the exhaust gas outlet area of the exhaust gas cooler emanates from a collecting chamber assigned to the cylinder-selective exhaust gas recirculation path, into which the flow channels of a group open . In this way, particularly good cooling can be achieved, since the division into several flow channels results in more surface area which can be brought into operative contact with the exhaust gas cooler.
    The cylinder-selective exhaust gas paths are not only routed after the exhaust gas cooling device, as in the prior art, but also separately from one another before or in the exhaust gas cooling device. The exhaust gas recirculation flow path is advantageously divided up in a condensation-free region of the exhaust gas cooling device. In other words, the exhaust gas recirculation flow path is divided up in the exhaust gas cooling device upstream of a region in which a condensate-forming cooling effect occurs. The condensate formation takes place after the division in each case in the individual flow channels and / or exhaust gas recirculation paths. The division of the exhaust gas recirculation flow path upstream of the exhaust gas cooling device or in the condensation-free area of the exhaust gas cooling device ensures that the condensate is evenly distributed over the individual cylinders.
    Thus, the condensate is not collected in a container as in the solutions known from the prior art and only then fed to the individual cylinders. Rather, the condensate arising in the individual flow channels and / or flow paths within the exhaust gas cooling device is fed together with the cooled exhaust gas either directly to each individual cylinder or at least to one inlet flow path of each cylinder. Components such as condensate collecting tanks, condensate lines, condensate pumps and condensate injection devices are therefore not absolutely necessary and can be omitted. On the one hand, this frees up installation space and reduces the number of components required. On the other hand, only a few parts are exposed to the corrosive condensate, which means that maintenance costs are significant
    reduced.
    In order to distribute the condensate equally to the individual cylinders
    It is advantageous if the length differences between at least two adjacent cylinder-selective exhaust gas recirculation paths between the division of the exhaust gas flow path and the opening in the inlet flow path or in the cylinder are a maximum of 10%, preferably a maximum of 5%, particularly preferably
    be a maximum of 2% of the length of the longest exhaust gas recirculation path.
    A particularly good uniform distribution of the condensate is possible if at least two - preferably all - cylinder-selective exhaust gas recirculation paths have approximately the same length and / or the same cross section. Conveniently they are
    Cylinder-selective exhaust gas recirculation paths made as short as possible.
    As a result, on the one hand, the same amount of recirculated exhaust gas is fed to each inlet flow path and / or each cylinder, and on the other hand, the same amount
    Amount of condensate.
    In a further development of the invention, it can be provided that at least one cylinder-selective exhaust gas recirculation path - at least in sections - is designed to be thermally insulated.
    In order not to negatively influence the exhaust gas recirculation paths on the degree of delivery, one embodiment of the invention provides that the oscillation lengths of the cylinder-selective exhaust gas recirculation paths are matched to the oscillation lengths of the inlet flow paths or intake pipes (e.g. 31-51) of the internal combustion engine. In other words, the oscillation length of an exhaust gas recirculation path assigned to a cylinder is in each case the oscillation length of the intake flow path assigned to this cylinder
    Voted.
    For the even distribution of the condensate to the individual cylinders, it is advantageous if the exhaust gas cooling device is arranged close to the openings in the inlet channels or close to the openings in the cylinders. This also minimizes the variation in the corresponding amounts of heat and the result is an even maintenance of the liquid phase of the condensate. According to one embodiment of the invention, the exhaust gas cooling device is between a
    Intake manifold of the intake system and the cylinders arranged.
    The invention is not explained below with reference to the ones shown in the figures
    limiting embodiments explained in more detail. They show schematically:
    Fig. 1 shows an internal combustion engine according to the invention in a first
    Design variant,
    2 shows an internal combustion engine according to the invention in a second
    Design variant,
    3a shows a first variant of an exhaust gas cooling device,
    3b shows a second variant of an exhaust gas cooling device, and
    3c shows a third variant of an exhaust gas cooling device.
    The same elements are given the same reference symbols in the design variants
    Mistake.
    1 and 2 show an internal combustion engine 1 with several cylinders 21, 22, 23, 24 with an intake system 3 and an exhaust system 4, as well as an exhaust gas recirculation system 5 for recirculating exhaust gas from the exhaust system 4 into the intake system 3. The exhaust system 4 has an exhaust gas aftertreatment system 6, the components of which, formed for example by three-way catalytic converters and / or particle filters, are denoted by 61, 62. In principle, the components of the exhaust gas aftertreatment system 6 can be arbitrary or corresponding
    be selected according to the respective requirements.
    The intake system 3 has an intake manifold 30, from which leading to the individual cylinders 21, 22, 23, 24 of the internal combustion engine 1
    Inlet flow paths 31, 32, 33, 34 exit.
    The exhaust gas recirculation system 5 has an exhaust gas recirculation flow path 50 in which at least one exhaust gas recirculation valve 7 and an exhaust gas cooling device 8 with at least one exhaust gas cooler 80 is arranged, the exhaust gas recirculation valve 7, for example, upstream of the exhaust gas cooler 80 (FIGS. 1, 2) or the exhaust gas cooler 81, 82 , 83, 84 (Fig. 3a) is arranged. Optional can be upstream
    of the exhaust gas recirculation valve 7 in addition to the exhaust gas cooling device 8
    be arranged single-flow exhaust gas precooler 9, as shown in Fig. 1 by dotted lines. Single flow means that the exhaust gas flow path 50 is not divided into partial exhaust gas flows.
    The dashed lines 50a, 50b, 50c, 50d in FIGS. 1 and 2 show different possible variants of the removal of the recirculated exhaust gas from the exhaust system 4 or the exhaust gas aftertreatment system 6 of a cylinder 21, 22, 23, 24 or via the exhaust gas recirculation line 50b after the merging of the exhaust lines 41, 42, 43, 44 of several cylinders 21, 22, 23, 24 upstream of the exhaust gas aftertreatment system 6 or via the exhaust gas recirculation line 50c between two components 61, 62 of the exhaust gas aftertreatment system 6 or via the exhaust gas recirculation line 50d
    can be taken from the exhaust gas aftertreatment system 6.
    In all embodiment variants, the exhaust gas recirculation flow path 50 is according to the invention in or downstream of the exhaust gas cooling device 8 in parallel! Cylinder-selective exhaust gas recirculation paths 51, 52, 53, 54 through which partial exhaust gas flows flow, with at least one cylinder-selective exhaust gas recirculation path 51, 52, 53, 54 assigned to each cylinder 21, 22, 23, 24 for cylinder-selective exhaust gas recirculation, which is divided into an inlet flow path 31, 32, 33 , 34 of the associated cylinder 21, 22, 23, 24 or opens directly into the associated cylinder 21, 22, 23, 24.
    The exhaust gas flow is therefore separated in front of or within the exhaust gas cooling device 8. In the context of the present disclosure, flow separation means that an exhaust gas flow is divided into several partial exhaust gas flows, the partial exhaust gas flows being directed into the separate cylinder-selective exhaust gas recirculation paths 51, 52, 53, 54.
    The differences in length between the cylinder-selective exhaust gas recirculation paths 51, 52, 53, 54 between the division of the exhaust gas flow path 50 and the opening in the inlet flow path 31, 32, 33, 34 or in the cylinders 21, 22, 23, 24 amount to a maximum of 10%, preferably a maximum of 5%, particularly preferably a maximum of 2% of the length of the longest exhaust gas recirculation path 51, 52, 53, 54. It is particularly advantageous for the even distribution of the recirculated exhaust gas
    and the condensate when the cylinder-selective exhaust gas recirculation paths 51, 52, 53,
    54 all have approximately the same length and the same cross section, wherein the exhaust gas recirculation paths 51, 52, 53, 54 should be dimensioned as short as possible. This can be achieved, for example, if the exhaust gas cooling device 8 is arranged between the inlet manifold 30 and the cylinders 21, 22, 23, 24 of the internal combustion engine 1, as shown in FIG. 1. In Fig. 1, an internal combustion engine 1 is shown only schematically - in a real implementation, the exhaust gas cooling device 8 would be above and / or below the between the inlet manifold
    30 and cylinders 21, 22, 23, 24 extending pipelines are arranged.
    In particular, it is advantageous if the line run downstream of the exhaust gas cooler 80 in the direction of the inlet flow paths 31, 32, 33, 34 of the associated cylinders 21, 22, 23, 24 or - depending on the embodiment - directly into the cylinders 21, 22, 23 , 24 is designed to decrease in the geodetic sense when the internal combustion engine 1 is used as intended. It can thus be ensured that the condensate is fed to the combustion and does not remain in the lines of the exhaust gas recirculation system 5 or possibly even the outlet system 4.
    In addition, the lengths of the cylinder-selective exhaust gas recirculation paths 51, 52, 53, 54 can each be matched to an oscillation length of the associated inlet flow paths 31, 32, 33, 34 of the internal combustion engine 1, in order to achieve a high
    To enable degree of filling.
    In order to avoid uneven condensate formation downstream of the exhaust gas cooling device 8 as a result of different heat transports, the cylinder-selective exhaust gas recirculation paths 51, 52, 53, 54 can be thermally insulated
    be trained.
    The exhaust gas cooling device 8 can have a plurality of individual exhaust gas coolers 81, 82, 83, 84 through which there is parallel flow, as is shown in FIG. 3a. An exhaust gas cooler 81, 82, 83, 84 is assigned to each cylinder 21, 22, 23, 24. In this case, the flow separation into individual exhaust gas recirculation paths 51, 52, 53, 54 takes place before entering the exhaust gas cooling device 8. An exhaust gas cooler 81, 82, 83, 84 is arranged in each exhaust gas recirculation path 51, 52, 53, 54. The exhaust gas recirculation flow path 50 is divided into the cylinder-selective exhaust gas recirculation paths 51, 52, 53, 54 through which there is parallel flow, that is, upstream of the cylinder-selective exhaust gas cooler 81, 82, 83, 84.
    In the embodiment variants shown in FIGS. 3b and 3c, the exhaust gas cooling device 8 has a common or one-piece exhaust gas cooler 80.
    Another embodiment variant is shown in FIG. 3b, in which the exhaust gas cooling device 8 has an exhaust gas cooler 80 with a distributor space 802 arranged in the region of an exhaust gas inlet 801 in the exhaust gas cooler 80. The exhaust gas cooler 80 has a plurality of flow channels 101, 102, 103, 104 between the distributor space 802 and an exhaust gas outlet region 803 from the exhaust gas cooler 80, the individual flow channels 101, 102, 103, 104 being separated in terms of flow. A flow channel 101; 102; 103; 104 exactly one cylinder-selective exhaust gas recirculation path 51; 52; 53; 54 assigned. This cylinder-selective exhaust gas recirculation path 51; 52; 53; 54 starts in the exhaust gas outlet region 803 of the exhaust gas cooler 80 from the flow channel. The multi-flow exhaust gas cooler thus has one flow per exhaust gas recirculation path 51, 52, 53, 54 and thus per cylinder 21, 22, 23, 24. The exhaust gas recirculation paths 51, 52, 53, 54 are each assigned to a cylinder 21, 22, 23, 24, as can be seen, for example, in FIG. 1 or in FIG. 2, or one of the respective cylinders
    Intake flow path 31, 32, 33, 34 associated with cylinders 21, 22, 23, 24.
    In the embodiment variant shown in FIG. 3c, the exhaust gas cooling device 8 has an exhaust gas cooler 80 with a distributor space 802 arranged in the region of an exhaust gas inlet 801 in the exhaust gas cooler 80. The exhaust gas cooler 80 has a multiplicity of flow channels 100 between the distributor space 802 and an exhaust gas outlet region 803 from the exhaust gas cooler 80, the individual
    Flow channels 100 are separated in terms of flow.
    In each case a group A, B, C, D with at least two flow channels 100 is assigned to a cylinder-selective exhaust gas recirculation path 51, 52, 53, 54. The flow channels 100 of each group A, B, C, D open in the exhaust gas outlet region 803 of the exhaust gas cooler 80 into a respective collecting space 804A, 804B, 804C, 804D. From each plenum 804A; 804B; 804C; 804D, an assigned cylinder-selective exhaust gas recirculation path 51, 52, 53, 54 starts. The multi-flow exhaust gas cooler 80 thus has several flows per exhaust gas recirculation path 51, 52, 53, 54 and thus per cylinder 21, 22, 23, 24.
    The line 11 in FIGS. 3a to 3c indicates the boundary between a condensation-free area and a condensation-affected area, whereby in FIGS. 3a to 3c the condensation-free area is to the left of the boundary 11 and the condensation-affected area is to the right of the boundary 11 . The position of this limit 11 can change depending on the operating point and the ambient conditions. The boundary 11 drawn in FIGS. 3a to 3c represents the earliest start of condensation in the operating temperature state. It can be clearly seen that in each of the embodiment variants shown in FIGS. 3a, 3b and 3c the division of the exhaust gas recirculation flow path 50 into flow channels 100 ; 101, 102, 103, 104 and / or in cylinder-selective exhaust gas recirculation paths 51; 52; 53; 54 already takes place in a condensation-free area of the exhaust gas cooling device 8.
    As a result of the solution according to the invention, the condensate produced in an exhaust gas recirculation system 5 can be fed to the cylinders selectively and a uniform supply of the cylinders can be achieved. While an application is particularly suitable for naturally aspirated engines - e.g. in a hybrid arrangement - turbo engines, e.g. with high-pressure exhaust gas recirculation, can also be improved
    become.
    权利要求:
    Claims (1)
    [1]
    PATENT CLAIMS
    Internal combustion engine (1) with several cylinders (21, 22, 23, 24), an intake system (3), an exhaust system (4) and an exhaust gas recirculation system (5) for recirculating exhaust gas from the exhaust system (4) into the intake system (3) , wherein the exhaust gas recirculation system (5) has at least one exhaust gas recirculation flow path (50) in which at least one exhaust gas cooling device (8) with at least one exhaust gas cooler (80; 81, 82, 83, 84) is arranged, characterized in that the exhaust gas recirculation flow path (50) is divided into partial exhaust gas flows in or upstream of the exhaust gas cooling device (8) and the partial exhaust gas flows for cylinder-selective exhaust gas recirculation are guided cylinder-selective exhaust gas recirculation paths (51, 52, 53, 54), each cylinder (21, 22, 23, 24) having at least one cylinder-selective exhaust gas recirculation path ( 51, 52, 53, 54), which enters an inlet flow path (31, 32, 33, 34) of the associated cylinder (21, 22, 23, 24) or directly into the associated cylinder (21, 2 2, 23, 24) opens.
    Internal combustion engine (1) according to claim 1, characterized in that the exhaust gas cooling device (8) has a plurality of exhaust gas coolers (81, 82, 83, 84), with each exhaust gas recirculation path (51, 52, 53, 54) at least one exhaust gas cooler (81, 82, 83, 84), and the exhaust gas recirculation flow path (50) is divided into the parallel flow through cylinder-selective exhaust gas recirculation paths (51, 52, 53, 54) upstream of the exhaust gas cooler (81, 82, 83, 84).
    Internal combustion engine (1) according to claim 1, characterized in that the exhaust gas cooling device (8) has an exhaust gas cooler (80) with a distributor space (802) preferably arranged in the region of an exhaust gas inlet (801) in the exhaust gas cooler (80), the exhaust gas cooler ( 80) has a plurality of flow channels (100; 101, 102, 103, 104) between the distributor space (802) and an exhaust gas outlet area (803) from the exhaust gas cooler (80), the individual flow channels (100; 101, 102, 103, 104)
    are separated in terms of flow.
    Internal combustion engine (1) according to claim 3, characterized in that
    each one flow channel (101, 102, 103, 104) a cylinder-selective
    Exhaust gas recirculation path (51, 52, 53, 54) is assigned and the assigned cylinder-selective exhaust gas recirculation path (51, 52, 53, 54) in the exhaust gas outlet area (803) of the exhaust gas cooler (80) emanates from this assigned flow channel (101, 102, 103, 104) .
    Internal combustion engine (1) according to claim 3, characterized in that a group (A, B, C, D) of at least two flow channels (100) is assigned to a cylinder-selective exhaust gas recirculation path (51, 52, 53, 54) and the assigned cylinder-selective exhaust gas recirculation path (51, 52, 53, 54) in the exhaust gas outlet area (03) of the exhaust gas cooler (80) emanates from a collecting chamber (804A, 804B, 804C, 804D) assigned to the cylinder-selective exhaust gas recirculation path (51, 52, 53, 54) in which the Flow channels (100) of a group (A, B, C, D) open.
    Internal combustion engine (1) according to one of Claims 1 to 5, characterized in that the exhaust gas recirculation flow path (50) is divided up in a condensation-free region of the exhaust gas cooling device (8).
    Internal combustion engine (1) according to one of claims 1 to 6, characterized in that the differences in length between at least two adjacent cylinder-selective exhaust gas recirculation paths (51, 52, 53, 54) between the division of the exhaust gas recirculation flow path (50) and the respective opening into the inlet flow path (31 , 32, 33, 34) or in the cylinder (21, 22, 23, 24) be a maximum of 10%, preferably a maximum of 5%, particularly preferably a maximum of 2% of the length of the longest exhaust gas recirculation path (51, 52, 53, 54).
    Internal combustion engine (1) according to one of claims 1 to 7, characterized in that at least two - preferably all cylinder-selective exhaust gas recirculation paths (51, 52, 53, 54) are approximately the same length
    and / or have the same cross-section.
    Internal combustion engine (1) according to one of claims 1 to 8, characterized in that at least one cylinder-selective exhaust gas recirculation path (51, 52, 53, 54) is designed - at least in sections - to be thermally insulated.
    10. Internal combustion engine (1) according to one of claims 1 to 9, characterized in that the oscillation lengths of the cylinder-selective exhaust gas recirculation paths (51, 52, 53, 54) are related to the oscillation length of the inlet flow paths (31, 32, 33, 34) of the internal combustion engine (1 ) are matched.
    11. Internal combustion engine (1) according to one of claims 1 to 10, characterized in that the exhaust gas cooling device (8) is arranged between an inlet manifold (30) of the inlet system (3) and the cylinders (21, 22, 23, 24).
    2019 12 16 FÜ
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    同族专利:
    公开号 | 公开日
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    引用文献:
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    CN113958393A|2021-12-22|2022-01-21|深圳市鑫鸿发环保设备有限公司|Waste gas intercepting and heat transferring recycling device and method for hybrid electric vehicle|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA51098/2019A|AT523180B1|2019-12-16|2019-12-16|COMBUSTION MACHINE WITH MULTIPLE CYLINDERS|ATA51098/2019A| AT523180B1|2019-12-16|2019-12-16|COMBUSTION MACHINE WITH MULTIPLE CYLINDERS|
    DE102020133653.5A| DE102020133653A1|2019-12-16|2020-12-16|Internal combustion engine with several cylinders|
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