EP3085942A1 - Exhaust gas recirculation module with replaceable heat exchanger cassette - Google Patents
Exhaust gas recirculation module with replaceable heat exchanger cassette Download PDFInfo
- Publication number
- EP3085942A1 EP3085942A1 EP16159188.8A EP16159188A EP3085942A1 EP 3085942 A1 EP3085942 A1 EP 3085942A1 EP 16159188 A EP16159188 A EP 16159188A EP 3085942 A1 EP3085942 A1 EP 3085942A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heat exchanger
- exhaust gas
- gas recirculation
- housing
- module according
- 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.)
- Granted
Links
- 238000002485 combustion reaction Methods 0.000 claims abstract description 17
- 238000012546 transfer Methods 0.000 claims description 13
- 239000002826 coolant Substances 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 7
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000003134 recirculating effect Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 50
- 239000000463 material Substances 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000000567 combustion gas Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Images
Classifications
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- 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
- F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
- F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
-
- 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
- F02M26/12—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems characterised by means for attaching parts of an EGR system to each other or to engine parts
-
- 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
- F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
- F02M26/32—Liquid-cooled heat exchangers
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
- F28D7/1684—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation the conduits having a non-circular cross-section
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/23—Layout, e.g. schematics
- F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
- F28F2250/06—Derivation channels, e.g. bypass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2280/00—Mounting arrangements; Arrangements for facilitating assembling or disassembling of heat exchanger parts
- F28F2280/02—Removable elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
- F28F3/025—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
Definitions
- the invention relates to an exhaust gas recirculation module for an internal combustion engine, in particular of a motor vehicle, with an exhaust gas recirculation valve, with which a volume flow of recirculating exhaust gas can be determined, and a heat exchanger in which the recirculated exhaust gas can be cooled.
- exhaust gas is usually taken from the exhaust pipe and admixed with the combustion air. This is for the reduction of nitrogen oxides (NOx) and compliance with emission limits in accordance with applicable regulations.
- NOx nitrogen oxides
- the exhaust gas can for example be taken directly from the exhaust manifold and be reintroduced on the intake side of the internal combustion engine. Depending on the conditions, the exhaust gas is either cooled before it is supplied to the combustion air, or it is supplied uncooled.
- the exhaust gas recirculation module In order to cool the exhaust gas, the exhaust gas recirculation module has an exhaust gas cooler through which the exhaust gas can be passed. If the exhaust gas is to be supplied uncooled, a bypass is opened (for example, by a vacuum box that opens or closes a bypass flap valve), so that the exhaust gas flows through a bypass channel and bypasses the heat exchanger. The amount of exhaust gas that is recycled as a whole, is controlled by a control valve that allows, for example, map-controlled the desired volume flow rate.
- the heat exchanger for the cooling of the recirculated exhaust gas is designed for the most powerful engine variant, and this heat exchanger is then installed in low-performance engines.
- the reason for this is that different variants lead to additional development costs.
- the individual components of the heat exchanger have quite high material and processing costs (stainless steels, cast stainless steel, sheets with high degree of deformation, furnace soldering with temperatures above 1000 ° C).
- the object of the invention is to optimize the exhaust gas recirculation module to the effect that lower total costs result even taking into account the development effort.
- the invention provides an exhaust gas recirculation module of the type mentioned that the heat exchanger has a replaceable heat exchanger cartridge. Furthermore, the invention provides a modular system for a heat exchanger of an exhaust gas recirculation system for internal combustion engines, with a heat exchanger housing, a valve housing and a plurality of heat exchanger cassettes, which differ in terms of their heat exchanger capacity, wherein the heat exchanger housing that heat exchanger cassette is installed, which is adapted to the heat exchanger requirements of the respective internal combustion engine.
- the invention is based on the idea to use a largely standardized heat exchanger, which is used with one and the same heat exchanger housing and with the same valve housing for different internal combustion engines, ie for internal combustion engines, which differ in terms of volume flow of guriquedem exhaust.
- a suitable heat exchanger cassette is inserted into the heat exchanger housing, that is, in the case of a large volume flow, a cassette with a greater heat exchanger capacity than at a smaller volume flow.
- This has the advantage that in terms of the heat exchanger housing and the valve housing large quantities are possible, resulting in lower unit costs leads.
- different EGR valves need not be designed and designed. However, material costs can be saved by using adapted heat exchanger cassettes.
- the "largest" engine variant for which the exhaust gas recirculation module is basically designed, usually has a rather small share of the sales figures.
- a "smaller” heat exchanger cassette may be used which requires less material for heat exchanger plates, exhaust ducts, etc.
- the heat exchanger has a heat exchanger housing having an access opening which is closed by a valve housing of the exhaust gas recirculation valve, and that the heat exchanger cassette is inserted through the access opening in the heat exchanger housing.
- no separate housing cover or the like is required to close the heat exchanger housing after the heat exchanger cassette is inserted; For closing the exhaust gas recirculation valve, which is anyway attached to the heat exchanger housing, is used.
- valve housing is connected to the heat exchanger housing by a flange connection.
- the flange connection makes it possible to connect the valve housing in a technically simple and robust manner with the heat exchanger housing, for example by a plurality of fastening screws, clamps, by caulking, by crimping, etc.
- the heat exchanger cassette may be provided with a sealing flange which is clamped between the heat exchanger housing and the valve housing.
- the heat exchanger cassette automatically ensures the seal between the heat exchanger housing and the valve housing, so that no additional seals are necessary.
- the sealing flange is provided with a recess through which a coolant can be passed from the valve housing to the heat exchanger housing. This allows an integrated cooling water supply of the exhaust gas recirculation valve and the heat exchanger can be achieved without external hoses or pipes are necessary.
- the heat exchanger cassette is provided on the exhaust gas downstream side with a plug connection.
- the plug-in connection makes it possible to establish a tight connection between the exhaust gas outlet side of the heat exchanger cassette and the heat exchanger housing without further measures.
- the heat exchanger housing may be made of plastic, an aluminum alloy or steel sheet. Such comparatively inexpensive materials can be used in particular because the heat exchanger housing itself is cooled.
- the different heat exchanger cassettes may differ in the area of the heat transfer elements and / or in the type of heat transfer elements used.
- a heat exchanger cassette for a "smaller" internal combustion engine can use a heat exchanger cassette in which the heat exchanger package is made shorter inside than in a variant for a "large” internal combustion engine.
- Different heat exchanger capacities can also be achieved by using, if necessary, more complex solutions with better heat transfer coefficients.
- one cassette may contain a tube bundle cooler while another cassette contains a plate cooler.
- the cassettes may also differ in that turbulence liners are provided in one type, while no turbulence liners are used in the other type.
- a cylinder head 10 which serves in a conventional manner to supply intake air to a plurality of cylinders of an internal combustion engine and to remove combustion gases from the cylinders.
- the intake air is provided via an intake system 12, and the combustion gases are exhausted via an exhaust manifold 14.
- a part of the exhaust gas can be taken from the exhaust line of the internal combustion engine and returned to the intake side.
- two different flow paths are possible.
- a first flow path passes through a heat exchanger 16, in which heat can be withdrawn from the exhaust gas.
- a coolant inlet 18 and a coolant outlet 20 are provided.
- an exhaust gas recirculation valve 22 is provided in order to control or regulate the volume flow through the heat exchanger 16.
- a second flow path extends through a bypass channel 24, through which exhaust gas can be passed directly from the exhaust gas to the suction side, bypassing the heat exchanger 16.
- the bypass channel 24 is associated with a bypass valve 26, with which the volume flow through the bypass channel can be controlled or regulated.
- the heat exchanger 16 has a heat exchanger housing 50, which may consist of plastic, an aluminum alloy or steel sheet.
- the heat exchanger housing 50 is provided with a mounting flange 52 which surrounds an access opening to the interior of the heat exchanger housing 50.
- valve housing 60 of the exhaust gas recirculation valve 22 is mounted on the mounting flange 52 of the heat exchanger housing 50.
- the valve housing 60 is also provided with a mounting flange, which is designated here by the reference numeral 62. To connect the two mounting flanges 52, 62 together, mounting screws 64 may be used.
- the interface can also be crimped or crimped with brackets or, in the case of a heat exchanger housing which consists of sheet metal.
- the valve housing 60 of the exhaust gas recirculation valve 22 is provided with an internal cooling passage 66 through which a coolant flowing from the coolant inlet 18 through the valve housing 60 of the exhaust gas recirculation valve 22 and then through the heat exchanger housing 50 to the coolant outlet 20.
- the transfer of the coolant from the cooling channel 66 in the interior of the valve housing 60 of the exhaust gas recirculation valve 22 to the heat exchanger housing 50 is effected by a plug connection 68 which is integrated into the connection surfaces of the mounting flanges 52, 62.
- a heat exchanger cassette 70 is arranged, the function of which is to ensure a reliable seal between the exhaust gas flowing through the heat exchanger 16 and the coolant also flowing through the heat exchanger 16 and, on the other hand, to allow good heat transfer from the exhaust gas to the coolant .
- a plurality of heat transfer elements 72 are arranged inside the heat exchanger cassette 70, which consist of a good heat-conducting and corrosion-resistant material, usually stainless steel.
- the heat exchanger cassette 70 is provided with a sealing flange 74 which is clamped between the two mounting flanges 52, 62.
- the sealing flange 74 may be associated with different seals, for example here a circumferential elastomeric seal 76 on the side of the Heat exchanger housing 50 and a gasket 78 on the side of the valve housing 60th
- the heat exchanger cassette 70 On the side facing away from the sealing flange 74, the heat exchanger cassette 70 is provided with a plug connection 80 which engages in a plug-in receptacle 82 when the heat exchanger cassette 70 is mounted inside the heat exchanger housing 50.
- the volume flow of exhaust gas to be passed through the heat exchanger 16 enters the valve housing 60 via an inlet 84, to which a valve seat 86 and a valve element 88 of the exhaust gas recirculation valve 22 are connected. Depending on the position of the exhaust gas recirculation valve 22, a more or less large flow cross section for the recirculated exhaust gas is released.
- the exhaust gas flows in the direction of the arrow P through the valve seat 86 and enters the heat exchange cassette 70. There it can deliver a portion of the entrained heat via the heat transfer elements 72 to the coolant and finally pass via the plug connection 80 to a port 90, from which it is supplied to the intake system.
- FIG. 5a schematically the heat exchanger housing 50 and the valve housing 60 of the exhaust gas recirculation valve 22 are shown. Further, it can be seen that there is an access opening Z to the interior of the heat exchanger housing 50 when the valve housing 60 is not yet secured to the mounting flange 62 of the heat exchanger housing 50.
- heat transfer elements 72 are used. These may differ in terms of their geometric design, their material, their packing density, their area and / or other parameters.
- FIG. 5d a heat exchanger cassette 70 is shown, which in terms of their length of the in the FIGS. 5b and 5c shown heat exchanger cassettes 70 different.
- the cartridge according to FIG. 5d is suitable for "smaller" engines, in which a lower volumetric flow of exhaust gas has to be recirculated. Accordingly, a smaller amount of heat within the heat exchanger 16 must be removed. It can be seen that the distance to the plug-in receptacle 82 of the heat exchanger housing 50 at the in FIG. 5d shown heat exchanger cassette 70 can be bridged with little effort, that the connector 80 is made longer.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Geometry (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
Ein Abgasrückführungsmodul für eine Verbrennungskraftmaschine insbesondere eines Kraftfahrzeugs hat ein Abgasrückführungsventil (22), mit dem ein Volumenstrom von rückzuführendem Abgas bestimmt werden kann, und einen Wärmetauscher (16), in dem das rückzuführende Abgas gekühlt werden kann. Der Wärmetauscher (16) weist eine austauschbare Wärmetauscherkassette (70) auf.An exhaust gas recirculation module for an internal combustion engine, in particular of a motor vehicle, has an exhaust gas recirculation valve (22), with which a volumetric flow of exhaust gas to be recirculated can be determined, and a heat exchanger (16), in which the recirculated exhaust gas can be cooled. The heat exchanger (16) has an exchangeable heat exchanger cassette (70).
Description
Die Erfindung betrifft ein Abgasrückführungsmodul für eine Verbrennungskraftmaschine insbesondere eines Kraftfahrzeugs, mit einem Abgasrückführungsventil, mit dem ein Volumenstrom von rückzuführendem Abgas bestimmt werden kann, und einem Wärmetauscher, in dem das rückzuführende Abgas gekühlt werden kann.The invention relates to an exhaust gas recirculation module for an internal combustion engine, in particular of a motor vehicle, with an exhaust gas recirculation valve, with which a volume flow of recirculating exhaust gas can be determined, and a heat exchanger in which the recirculated exhaust gas can be cooled.
Bei Verbrennungskraftmaschinen wird üblicherweise Abgas aus der Abgasleitung entnommen und der Verbrennungsluft beigemischt. Dies dient der Reduktion von Stickoxiden (NOx) und der Einhaltung von Emissionsgrenzen gemäß den geltenden Vorschriften.In internal combustion engines, exhaust gas is usually taken from the exhaust pipe and admixed with the combustion air. This is for the reduction of nitrogen oxides (NOx) and compliance with emission limits in accordance with applicable regulations.
Das Abgas kann beispielsweise unmittelbar am Abgaskrümmer entnommen werden und auf der Ansaugseite der Verbrennungskraftmaschine wieder eingeleitet werden. In Abhängigkeit von den Rahmenbedingungen wird das Abgas entweder gekühlt, bevor es der Verbrennungsluft zugeführt wird, oder es wird ungekühlt zugeführt.The exhaust gas can for example be taken directly from the exhaust manifold and be reintroduced on the intake side of the internal combustion engine. Depending on the conditions, the exhaust gas is either cooled before it is supplied to the combustion air, or it is supplied uncooled.
Um das Abgas kühlen zu können, weist das Abgasrückführungsmodul einen Abgaskühler auf, durch den das Abgas geführt werden kann. Wenn das Abgas ungekühlt zugeführt werden soll, wird ein Bypass geöffnet (beispielsweise durch eine Unterdruckdose, die ein Bypass-Klappenventil öffnet oder schließt), sodass das Abgas durch einen Bypasskanal strömt und den Wärmetauscher umgeht. Die Menge des Abgases, das insgesamt rückgeführt wird, wird dabei gesteuert durch ein Regelventil, das beispielsweise kennfeldgesteuert den gewünschten Volumendurchsatz ermöglicht.In order to cool the exhaust gas, the exhaust gas recirculation module has an exhaust gas cooler through which the exhaust gas can be passed. If the exhaust gas is to be supplied uncooled, a bypass is opened (for example, by a vacuum box that opens or closes a bypass flap valve), so that the exhaust gas flows through a bypass channel and bypasses the heat exchanger. The amount of exhaust gas that is recycled as a whole, is controlled by a control valve that allows, for example, map-controlled the desired volume flow rate.
Stetig steigende Umweltauflagen und hiermit verbundene, reduzierte Emissionsgrenzen erfordern neue, qualitativ höherwertige Regelsysteme im Abgasrückführungsbereich. Dabei ist der rückzuführende Volumenstrom an Abgas je nach Motorvariante (Motoren mit drei, vier, sechs, ... Zylindern) unterschiedlich.Steadily increasing environmental regulations and associated, reduced emission limits require new, higher-quality control systems in the exhaust gas recirculation area. The recirculating flow is Exhaust depending on engine variant (engines with three, four, six, ... cylinders) differently.
Bisher wird im Stand der Technik allerdings der Wärmetauscher für die Kühlung des rückgeführten Abgases auf die leistungsstärkste Motorenvariante ausgelegt, und dieser Wärmetauscher wird dann auch in leistungsschwächeren Motoren eingebaut. Der Grund hierfür ist, dass unterschiedliche Varianten zu zusätzlichen Entwicklungskosten führen. Weiterhin ist zu berücksichtigen, dass die einzelnen Komponenten des Wärmetauschers recht hohe Material- und Verarbeitungskosten haben (Edelstähle, Edelstahlguss, Bleche mit hohem Umformgrad, Ofenlötung mit Temperaturen oberhalb 1000 °C).So far, however, in the prior art, the heat exchanger for the cooling of the recirculated exhaust gas is designed for the most powerful engine variant, and this heat exchanger is then installed in low-performance engines. The reason for this is that different variants lead to additional development costs. Furthermore, it should be noted that the individual components of the heat exchanger have quite high material and processing costs (stainless steels, cast stainless steel, sheets with high degree of deformation, furnace soldering with temperatures above 1000 ° C).
Die Aufgabe der Erfindung besteht darin, das Abgasrückführungsmodul dahingehend zu optimieren, dass sich auch unter Berücksichtigung des Entwicklungsaufwandes geringere Gesamtkosten ergeben.The object of the invention is to optimize the exhaust gas recirculation module to the effect that lower total costs result even taking into account the development effort.
Zur Lösung dieser Aufgabe ist erfindungsgemäß bei einem Abgasrückführungsmodul der eingangs genannten Art vorgesehen, dass der Wärmetauscher eine austauschbare Wärmetauscherkassette aufweist. Weiterhin ist erfindungsgemäß ein Baukastensystem für einen Wärmetauscher eines Abgasrückführungssystems für Verbrennungskraftmaschinen vorgesehen, mit einem Wärmetauschergehäuse, einem Ventilgehäuse und mehreren Wärmetauscherkassetten, die sich hinsichtlich ihrer Wärmetauscherkapazität unterscheiden, wobei im Wärmetauschergehäuse diejenige Wärmetauscherkassette verbaut ist, die an den Wärmetauscherbedarf der jeweiligen Verbrennungskraftmaschine angepasst ist. Die Erfindung beruht auf dem Grundgedanken, einen weitestgehend standardisierten Wärmetauscher zu verwenden, der mit ein und demselben Wärmetauschergehäuse und mit ein und demselben Ventilgehäuse für unterschiedliche Verbrennungskraftmaschinen verwendet wird, also für Verbrennungskraftmaschinen, die sich hinsichtlich des Volumenstroms von rückzuführendem Abgas unterscheiden. In Abhängigkeit vom Volumenstrom wird jedoch eine geeignete Wärmetauscherkassette in das Wärmetauschergehäuse eingesetzt, also bei einem großen Volumenstrom eine Kassette mit einem größeren Wärmetauschervermögen als bei einem kleineren Volumenstrom. Dies hat den Vorteil, dass hinsichtlich des Wärmetauschergehäuses und des Ventilgehäuses große Stückzahlen möglich sind, was zu niedrigeren Stückkosten führt. Außerdem müssen nicht unterschiedliche Abgasrückführungsventile entwickelt und ausgelegt werden. Jedoch lassen sich Materialkosten dadurch einsparen, dass angepasste Wärmetauscherkassetten verwendet werden. Dabei ist zu berücksichtigen, dass die "größte" Motorenvariante, für die das Abgasrückführungsmodul grundsätzlich ausgelegt wird, üblicherweise einen eher geringen Anteil an den Verkaufszahlen hat. Für den Großteil der tatsächlich verwendeten Abgasrückführungsmodule kann eine "kleinere" Wärmetauscherkassette eingesetzt werden, bei der weniger Material für Wärmetauscherplatten, Abgasführungskanäle, etc. notwendig ist.To achieve this object, the invention provides an exhaust gas recirculation module of the type mentioned that the heat exchanger has a replaceable heat exchanger cartridge. Furthermore, the invention provides a modular system for a heat exchanger of an exhaust gas recirculation system for internal combustion engines, with a heat exchanger housing, a valve housing and a plurality of heat exchanger cassettes, which differ in terms of their heat exchanger capacity, wherein the heat exchanger housing that heat exchanger cassette is installed, which is adapted to the heat exchanger requirements of the respective internal combustion engine. The invention is based on the idea to use a largely standardized heat exchanger, which is used with one and the same heat exchanger housing and with the same valve housing for different internal combustion engines, ie for internal combustion engines, which differ in terms of volume flow of rückzuführendem exhaust. Depending on the volume flow, however, a suitable heat exchanger cassette is inserted into the heat exchanger housing, that is, in the case of a large volume flow, a cassette with a greater heat exchanger capacity than at a smaller volume flow. This has the advantage that in terms of the heat exchanger housing and the valve housing large quantities are possible, resulting in lower unit costs leads. In addition, different EGR valves need not be designed and designed. However, material costs can be saved by using adapted heat exchanger cassettes. It should be noted that the "largest" engine variant, for which the exhaust gas recirculation module is basically designed, usually has a rather small share of the sales figures. For the majority of the exhaust gas recirculation modules actually used, a "smaller" heat exchanger cassette may be used which requires less material for heat exchanger plates, exhaust ducts, etc.
Gemäß einer bevorzugten Ausführungsform der Erfindung ist vorgesehen, dass der Wärmetauscher ein Wärmetauschergehäuse aufweist, das eine Zugangsöffnung aufweist, die von einem Ventilgehäuse des Abgasrückführungsventils verschlossen ist, und dass die Wärmetauscherkassette durch die Zugangsöffnung in das Wärmetauschergehäuse eingesetzt ist. Bei dieser Ausführungsform ist kein separater Gehäusedeckel oder ein ähnliches Verschlusselement notwendig, um das Wärmetauschergehäuse zu verschließen, nachdem die Wärmetauscherkassette eingesetzt ist; zum Verschließen wird das sowieso am Wärmetauschergehäuse angebrachte Abgasrückführungsventil verwendet.According to a preferred embodiment of the invention it is provided that the heat exchanger has a heat exchanger housing having an access opening which is closed by a valve housing of the exhaust gas recirculation valve, and that the heat exchanger cassette is inserted through the access opening in the heat exchanger housing. In this embodiment, no separate housing cover or the like is required to close the heat exchanger housing after the heat exchanger cassette is inserted; For closing the exhaust gas recirculation valve, which is anyway attached to the heat exchanger housing, is used.
Dabei kann vorgesehen sein, dass das Ventilgehäuse mit dem Wärmetauschergehäuse durch eine Flanschverbindung verbunden ist. Die Flanschverbindung ermöglicht es, das Ventilgehäuse in technisch einfacher und robuster Weise mit dem Wärmetauschergehäuse zu verbinden, beispielsweise durch mehrere Befestigungsschrauben, Klammern, durch Verstemmen, durch Vercrimpen, etc.It can be provided that the valve housing is connected to the heat exchanger housing by a flange connection. The flange connection makes it possible to connect the valve housing in a technically simple and robust manner with the heat exchanger housing, for example by a plurality of fastening screws, clamps, by caulking, by crimping, etc.
Die Wärmetauscherkassette kann mit einem Dichtungsflansch versehen sein, der zwischen dem Wärmetauschergehäuse und dem Ventilgehäuse eingespannt ist. Bei dieser Ausgestaltung gewährleistet die Wärmetauscherkassette automatisch die Abdichtung zwischen dem Wärmetauschergehäuse und dem Ventilgehäuse, sodass keine zusätzlichen Dichtungen notwendig sind.The heat exchanger cassette may be provided with a sealing flange which is clamped between the heat exchanger housing and the valve housing. In this embodiment, the heat exchanger cassette automatically ensures the seal between the heat exchanger housing and the valve housing, so that no additional seals are necessary.
Gemäß einer Ausgestaltung der Erfindung ist vorgesehen, dass der Dichtungsflansch mit einer Aussparung versehen ist, durch die ein Kühlmittel vom Ventilgehäuse zum Wärmetauschergehäuse geleitet werden kann. Hierdurch kann eine integrierte Kühlwasserversorgung des Abgasrückführungsventils und des Wärmetauschers erzielt werden, ohne dass externe Schläuche oder Rohre notwendig sind.According to one embodiment of the invention it is provided that the sealing flange is provided with a recess through which a coolant can be passed from the valve housing to the heat exchanger housing. This allows an integrated cooling water supply of the exhaust gas recirculation valve and the heat exchanger can be achieved without external hoses or pipes are necessary.
Gemäß einer Ausgestaltung der Erfindung ist vorgesehen, dass die Wärmetauscherkassette auf der Abgas-stromabwärtigen Seite mit einem Steckanschluss versehen ist. Der Steckanschluss ermöglicht es, ohne weitere Maßnahmen eine dichte Verbindung zwischen der Abgas-Auslassseite der Wärmetauscherkassette und dem Wärmetauschergehäuse herzustellen.According to one embodiment of the invention, it is provided that the heat exchanger cassette is provided on the exhaust gas downstream side with a plug connection. The plug-in connection makes it possible to establish a tight connection between the exhaust gas outlet side of the heat exchanger cassette and the heat exchanger housing without further measures.
Das Wärmetauschergehäuse kann aus Kunststoff, einer Aluminiumlegierung oder Stahlblech bestehen. Solche vergleichsweise kostengünstige Werkstoffe können insbesondere deshalb eingesetzt werden, da das Wärmetauschergehäuse selbst gekühlt ist.The heat exchanger housing may be made of plastic, an aluminum alloy or steel sheet. Such comparatively inexpensive materials can be used in particular because the heat exchanger housing itself is cooled.
Die unterschiedlichen Wärmetauscherkassetten können sich hinsichtlich der Fläche der Wärmeübertragungselemente und/oder hinsichtlich des Typs der verwendeten Wärmeübertragungselemente unterscheiden. So kann beispielsweise eine Wärmetauscherkassette für eine "kleinere" Verbrennungskraftmaschine eine Wärmetauscherkassette verwenden, bei der das Wärmetauscherpaket im Inneren kürzer ausgeführt ist als bei einer Variante für eine "große" Verbrennungskraftmaschine. Unterschiedliche Wärmetauscherkapazitäten können auch dadurch erreicht werden, dass bei Bedarf aufwendigere Lösungen mit besserem Wärmeübergangskoeffizienten verwendet werden. So kann eine Kassette einen Rohrbündelkühler enthalten, während eine andere Kassette einen Plattenkühler enthält. Die Kassetten können sich auch dadurch unterscheiden, dass in einem Typ Turbulenzeinlagen vorgesehen sind, während im anderen Typ keine Turbulenzeinlagen verwendet werden.The different heat exchanger cassettes may differ in the area of the heat transfer elements and / or in the type of heat transfer elements used. For example, a heat exchanger cassette for a "smaller" internal combustion engine can use a heat exchanger cassette in which the heat exchanger package is made shorter inside than in a variant for a "large" internal combustion engine. Different heat exchanger capacities can also be achieved by using, if necessary, more complex solutions with better heat transfer coefficients. Thus, one cassette may contain a tube bundle cooler while another cassette contains a plate cooler. The cassettes may also differ in that turbulence liners are provided in one type, while no turbulence liners are used in the other type.
Die Erfindung wird nachfolgend anhand verschiedener Ausführungsformen erläutert, die in den beigefügten Zeichnungen dargestellt sind. In diesen zeigen:
-
Figur 1 in einer perspektivischen Explosionsansicht einen Zylinderkopf mit Abgasrückführungsmodul; -
Figur 2 den Zylinderkopf vonFigur 1 mit Abgasrückführungsmodul in einer ersten perspektivischen Ansicht; -
Figur 3 in einer perspektivischen Explosionsansicht den Wärmetauscher des in denFiguren 1 und 2 gezeigten Abgasrückführungsmoduls; -
Figur 4 eine perspektivische, teilgeschnittene Ansicht des Wärmetauschers vonFigur 3 ; und -
Figur 5 schematisch ein Abgaswärmetauschergehäuse und ein Ventilgehäuse zusammen mit verschiedenen Wärmetauscherkassetten.
-
FIG. 1 in a perspective exploded view of a cylinder head with exhaust gas recirculation module; -
FIG. 2 the cylinder head ofFIG. 1 with exhaust gas recirculation module in a first perspective view; -
FIG. 3 in a perspective exploded view of the heat exchanger in theFigures 1 and 2 shown exhaust gas recirculation module; -
FIG. 4 a perspective, partially sectioned view of the heat exchanger ofFIG. 3 ; and -
FIG. 5 schematically an exhaust heat exchanger housing and a valve housing together with various heat exchanger cassettes.
Anhand der
Es ist ein Zylinderkopf 10 zu sehen, der in an sich bekannter Weise dazu dient, mehreren Zylindern einer Verbrennungskraftmaschine Ansaugluft zuzuführen und Verbrennungsgase von den Zylindern abzuführen. Die Ansaugluft wird über ein Ansaugsystem 12 bereitgestellt, und die Verbrennungsgase werden über einen Abgaskrümmer 14 abgeführt.It can be seen a
Bei bestimmten Betriebszuständen kann ein Teil des Abgases aus dem Abgasstrang der Verbrennungskraftmaschine entnommen und zur Ansaugseite zurückgeführt werden. Hierfür sind zwei unterschiedliche Strömungswege möglich.In certain operating conditions, a part of the exhaust gas can be taken from the exhaust line of the internal combustion engine and returned to the intake side. For this purpose, two different flow paths are possible.
Ein erster Strömungsweg verläuft durch einen Wärmetauscher 16, in welchem dem Abgas Wärme entzogen werden kann. Zu diesem Zweck sind ein Kühlmitteleinlass 18 und ein Kühlmittelauslass 20 vorgesehen. Um den Volumenstrom durch den Wärmetauscher 16 zu steuern oder zu regeln, ist ein Abgasrückführungsventil 22 vorgesehen.A first flow path passes through a
Ein zweiter Strömungsweg verläuft durch einen Bypasskanal 24, durch den Abgas unter Umgehung des Wärmetauschers 16 direkt von der Abgas- zur Ansaugseite geleitet werden kann. Dem Bypasskanal 24 ist ein Bypassventil 26 zugeordnet, mit dem der Volumenstrom durch den Bypasskanal gesteuert oder geregelt werden kann.A second flow path extends through a
Der Wärmetauscher 16 weist ein Wärmetauschergehäuse 50 auf, das aus Kunststoff, einer Aluminiumlegierung oder Stahlblech bestehen kann.The
Das Wärmetauschergehäuse 50 ist mit einem Montageflansch 52 versehen, der eine Zugangsöffnung zum Inneren des Wärmetauschergehäuses 50 umgibt.The
Am Montageflansch 52 des Wärmetauschergehäuses 50 ist ein Ventilgehäuse 60 des Abgasrückführungsventils 22 angebracht. Das Ventilgehäuse 60 ist ebenfalls mit einem Montageflansch versehen, der hier mit dem Bezugszeichen 62 bezeichnet ist. Um die beiden Montageflansche 52, 62 miteinander zu verbinden, können Befestigungsschrauben 64 verwendet werden.On the
Alternativ zur Schraublösung kann die Schnittstelle auch mit Klammern oder im Falle eines Wärmetauschergehäuses, das aus Blech besteht, durch verstemmt oder vercrimpt werden.As an alternative to the screw solution, the interface can also be crimped or crimped with brackets or, in the case of a heat exchanger housing which consists of sheet metal.
Das Ventilgehäuse 60 des Abgasrückführungsventils 22 ist mit einem internen Kühlkanal 66 versehen, durch den ein Kühlmittel strömen kann, das vom Kühlmitteleinlass 18 durch das Ventilgehäuse 60 des Abgasrückführungsventils 22 und dann durch das Wärmetauschergehäuse 50 zum Kühlmittelauslass 20 strömt. Die Übergabe des Kühlmittels vom Kühlkanal 66 im Inneren des Ventilgehäuses 60 des Abgasrückführungsventils 22 zum Wärmetauschergehäuse 50 erfolgt durch einen Steckanschluss 68, der integriert ist in die Anschlussflächen der Montageflansche 52, 62.The
Im Inneren des Wärmetauschergehäuses 50 ist eine Wärmetauscherkassette 70 angeordnet, deren Funktion darin besteht, einerseits eine zuverlässige Abdichtung zwischen dem durch den Wärmetauscher 16 strömende Abgas und das ebenfalls durch den Wärmetauscher 16 strömende Kühlmittel zu gewährleisten und andererseits einen guten Wärmeübergang vom Abgas zum Kühlmittel zu ermöglichen. Zu diesem Zweck sind im Inneren der Wärmetauscherkassette 70 mehrere Wärmeübertragungselemente 72 angeordnet, die aus einem gut wärmeleitenden und korrosionsbeständigen Material bestehen, üblicherweise Edelstahl.In the interior of the
Die Wärmetauscherkassette 70 ist mit einem Dichtungsflansch 74 versehen, der zwischen den beiden Montageflanschen 52, 62 eingespannt wird. Dem Dichtungsflansch 74 können verschiedene Dichtungen zugeordnet sein, beispielsweise hier eine umlaufende Elastomerdichtung 76 auf der Seite des Wärmetauschergehäuses 50 sowie eine Flachdichtung 78 auf der Seite des Ventilgehäuses 60.The
Auf der vom Dichtungsflansch 74 abgewandten Seite ist die Wärmetauscherkassette 70 mit einem Steckanschluss 80 versehen, der in eine Steckaufnahme 82 eingreift, wenn die Wärmetauscherkassette 70 im Inneren des Wärmetauschergehäuses 50 montiert ist.On the side facing away from the sealing
Der durch den Wärmetauscher 16 zu leitende Volumenstrom an rückzuführendem Abgas tritt in das Ventilgehäuse 60 über einen Eintritt 84 ein, an den sich ein Ventilsitz 86 und ein Ventilelement 88 des Abgasrückführungsventils 22 anschließen. In Abhängigkeit von der Stellung des Abgasrückführungsventils 22 ist ein mehr oder weniger großer Strömungsquerschnitt für das rückzuführende Abgas freigegeben.The volume flow of exhaust gas to be passed through the
Wenn ein Strömungsquerschnitt freigegeben ist, strömt das Abgas in der Richtung des Pfeils P durch den Ventilsitz 86 und tritt in die Wärmetauscherkassette 70 ein. Dort kann es einen Teil der mitgeführten Wärme über die Wärmeübertragungselemente 72 an das Kühlmittel abgeben und schließlich über den Steckanschluss 80 zu einem Anschluss 90 gelangen, von dem es dem Ansaugsystem zugeführt wird.When a flow area is released, the exhaust gas flows in the direction of the arrow P through the
In
In das Wärmetauschergehäuse 50 können unterschiedliche Wärmetauscherkassetten eingesetzt werden, die in den
Der Unterschied zwischen den in den
In
Claims (13)
Applications Claiming Priority (1)
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DE102015206895.1A DE102015206895A1 (en) | 2015-04-16 | 2015-04-16 | Exhaust gas recirculation module with exchangeable heat exchanger cassette |
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EP3085942B1 EP3085942B1 (en) | 2018-08-22 |
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EP16159188.8A Active EP3085942B1 (en) | 2015-04-16 | 2016-03-08 | Exhaust gas recirculation module with replaceable heat exchanger cassette |
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DE102019107792A1 (en) | 2019-03-26 | 2020-10-01 | Faurecia Emissions Control Technologies, Germany Gmbh | Modular system for exhaust heat recovery devices, tubular adapter for a modular system and vehicle |
Citations (4)
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EP0930429A2 (en) * | 1998-01-15 | 1999-07-21 | Steyr-Nutzfahrzeuge Aktiengesellschaft | Method and device for cooling recirculated exhaust gas of a liquid cooled engine |
DE102006039497A1 (en) * | 2005-08-23 | 2007-03-01 | Detroit Diesel Corp., Detroit | Manifold body for internal combustion engine e.g. diesel engine, has air intake manifold arranged over EGR cooler cavity, which is arranged over oil cooler cavity, where cooler cavities and manifold are arranged parallel to each other |
WO2007098854A1 (en) * | 2006-02-24 | 2007-09-07 | Behr Gmbh & Co. Kg | Valve for regulating an exhaust gas flow of an internal combustion engine, heat exchanger for exhaust gas cooling, system having at least one valve and having at least one heat exchanger |
DE102010014843A1 (en) * | 2010-04-13 | 2011-10-13 | Pierburg Gmbh | Exhaust gas cooling module for an internal combustion engine |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102004010117A1 (en) * | 2003-02-27 | 2004-11-18 | Denso Corp., Kariya | Exhaust gas recirculation circuit for motor vehicle internal combustion engine has regulating valve connected to heat exchanger outlet and bypass pipe |
DE102006049106A1 (en) * | 2005-10-20 | 2007-06-14 | Behr Gmbh & Co. Kg | Heat exchanger for cooling exhaust gases has first housing element able to be cooled by liquid coolant |
DE102008002430C5 (en) * | 2007-07-11 | 2018-03-22 | Hanon Systems | Exhaust gas heat exchanger with vibration-damped exchanger tube bundle |
DE102011001854A1 (en) * | 2011-04-06 | 2012-10-11 | Pierburg Gmbh | Exhaust gas recirculation cooler module |
-
2015
- 2015-04-16 DE DE102015206895.1A patent/DE102015206895A1/en not_active Withdrawn
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2016
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0930429A2 (en) * | 1998-01-15 | 1999-07-21 | Steyr-Nutzfahrzeuge Aktiengesellschaft | Method and device for cooling recirculated exhaust gas of a liquid cooled engine |
DE102006039497A1 (en) * | 2005-08-23 | 2007-03-01 | Detroit Diesel Corp., Detroit | Manifold body for internal combustion engine e.g. diesel engine, has air intake manifold arranged over EGR cooler cavity, which is arranged over oil cooler cavity, where cooler cavities and manifold are arranged parallel to each other |
WO2007098854A1 (en) * | 2006-02-24 | 2007-09-07 | Behr Gmbh & Co. Kg | Valve for regulating an exhaust gas flow of an internal combustion engine, heat exchanger for exhaust gas cooling, system having at least one valve and having at least one heat exchanger |
DE102010014843A1 (en) * | 2010-04-13 | 2011-10-13 | Pierburg Gmbh | Exhaust gas cooling module for an internal combustion engine |
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