EP1589214A2 - Exhaust recirculation system - Google Patents

Exhaust recirculation system Download PDF

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Publication number
EP1589214A2
EP1589214A2 EP05001654A EP05001654A EP1589214A2 EP 1589214 A2 EP1589214 A2 EP 1589214A2 EP 05001654 A EP05001654 A EP 05001654A EP 05001654 A EP05001654 A EP 05001654A EP 1589214 A2 EP1589214 A2 EP 1589214A2
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
gas recirculation
housing
bypass
heat exchanger
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
Application number
EP05001654A
Other languages
German (de)
French (fr)
Other versions
EP1589214B1 (en
EP1589214A3 (en
Inventor
Hans-Jürgen Hüsges
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Pierburg GmbH
Original Assignee
Pierburg GmbH
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Filing date
Publication date
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Publication of EP1589214A3 publication Critical patent/EP1589214A3/en
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Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • F02M26/26—Layout, e.g. schematics with coolers having bypasses characterised by details of the bypass valve
    • 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
    • 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
    • F02M26/13—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
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/55—Systems for actuating EGR valves using vacuum actuators
    • F02M26/56—Systems for actuating EGR valves using vacuum actuators having pressure modulation valves
    • F02M26/57—Systems for actuating EGR valves using vacuum actuators having pressure modulation valves using electronic means, e.g. electromagnetic valves
    • 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
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
    • 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
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
    • F28D9/0043—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another
    • F28D9/0056—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another with U-flow or serpentine-flow inside conduits; with centrally arranged openings on the plates
    • 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
    • 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
    • F02M26/51—EGR valves combined with other devices, e.g. with intake valves or compressors
    • 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
    • F02M26/66—Lift valves, e.g. poppet valves
    • 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
    • F02M26/70—Flap valves; Rotary valves; Sliding valves; Resilient valves
    • 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
    • F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
    • F28F2009/222—Particular guide plates, baffles or deflectors, e.g. having particular orientation relative to an elongated casing or conduit
    • F28F2009/224—Longitudinal partitions
    • 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
    • F28F2250/10—Particular pattern of flow of the heat exchange media
    • F28F2250/102—Particular pattern of flow of the heat exchange media with change of flow direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/14—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes molded

Definitions

  • the invention relates to an exhaust gas recirculation system for an internal combustion engine with an exhaust gas inlet, an exhaust gas outlet and an exhaust gas cooling device, the one Heat exchange unit, which is flowed through by a coolant, and with a bypass channel through which the heat exchanger unit can be bypassed and in the a bypass flap is arranged.
  • the exhaust gas is via an exhaust gas recirculation passage led from the exhaust manifold back to the intake manifold of the internal combustion engine.
  • the regulation of the exhaust gas flow takes place via an exhaust gas recirculation valve, which is arranged in the exhaust gas recirculation channel.
  • exhaust gas recirculation passages it is known to arrange cooling devices in the exhaust gas recirculation passages, so that the exhaust gas is cooled back into the intake manifold, whereby the NO x emissions can be reduced. Since at the start of the engine the fastest possible heating of the coolant but also of a catalytic converter is desired, exhaust gas recirculation systems have been implemented in which the exhaust gas cooling device can be bypassed via a bypass channel, whereby the bypass channel is controlled by a bypass flap or a bypass valve.
  • DE 198 41 927 A1 discloses a device for returning an exhaust gas stream described to the intake manifold of an internal combustion engine, wherein the exhaust gas cooling device executed with the bypass channel as a unit, wherein the bypass flap disposed between an exhaust inlet and an exhaust outlet of the cooling device is, so that the way through the radiator on the bypass channel are bypassed can.
  • the exhaust gas recirculation channel In the continuing area of the exhaust gas recirculation channel that is the amount of exhaust gas regulating exhaust gas recirculation valve arranged.
  • EP 0 916 837 B1 discloses a device for exhaust gas recirculation for an internal combustion engine described in which the exhaust gas cooling device and the exhaust gas recirculation valve are designed as a structural unit, wherein an actuating element of the valve is cooled by the flowing coolant. This should be the thermal load of the actuating element can be reduced. A bypass of the exhaust gas cooler over a Bypass channel is not provided.
  • DE 197 40 998 A1 describes an exhaust gas recirculation system for an internal combustion engine in which an exhaust gas recirculation valve is fastened to a connection base, which in turn is fastened to a cooling device which is arranged on the intake pipe.
  • a cooling device which is arranged on the intake pipe.
  • the exhaust gas recirculation system a housing in which the heat exchanger unit, the bypass flap and a housing part the exhaust gas recirculation valve, in which at least the valve seat is arranged, formed are, wherein the valve seat is cooled by the coolant, and that the exhaust gas recirculation valve the exhaust gas cooling device with the heat exchanger unit and the bypass channel form a structural unit with the bypass flap.
  • valve seat of the exhaust gas recirculation valve between the bypass channel or the heat exchanger unit and the Exhaust outlet arranged, whereby the thermal load in particular of Control element of the exhaust gas recirculation valve in comparison to versions in which the exhaust gas recirculation valve is arranged in front of the exhaust gas cooler, is reduced.
  • the forms can be chosen so that the four housing shells in cost Alloy die casting process can be produced.
  • the first housing shell forms the exhaust gas inlet, a lower part of the exhaust gas cooling device and a lower outer wall of the Bypass
  • the second housing shell an upper part of the exhaust gas cooling device with a coolant inlet and a coolant outlet and an upper outer wall of the Bypass
  • the third housing shell a lower part of the heat exchanger unit and the housing of the exhaust gas recirculation valve, the exhaust gas outlet and a lower inner wall the bypass channel and a lower part of a partition, in which the Bypass flap is arranged and having a lower bearing point of the bypass valve and the fourth housing shell an upper part of the heat exchanger unit and the Housing of the exhaust gas recirculation valve, an upper inner wall of the bypass channel as well an upper part of an intermediate wall, in which the bypass flap is arranged and which has an upper bearing point of the bypass flap.
  • the exhaust gas recirculation valve is as Plug valve executed, which is inserted into the housing and its valve seat flows around the cooling of the coolant for cooling.
  • the design of the exhaust gas recirculation valve as a plug valve simplifies the assembly during the flow around the Valve seat with coolant the cooling effect on the housing respectively optimizes the valve seat of the exhaust gas recirculation valve, so that adhesions of the exhaust gas recirculation valve reliably avoided.
  • the first housing shell forms the exhaust gas inlet, the exhaust gas outlet, a lower part of the exhaust gas cooling device and the bypass channel and the housing of the exhaust gas recirculation valve
  • the second housing shell Upper part of the exhaust gas cooling device with a coolant inlet and a coolant outlet and the bypass channel
  • the third housing shell a lower part of the heat exchanger unit a lower part of an intermediate wall, in which the bypass flap is arranged is and which has a lower bearing point of the bypass valve
  • the fourth housing shell an upper part of the heat exchanger unit and an upper part an intermediate wall, in which the bypass flap is arranged and the upper bearing point the bypass flap has.
  • the exhaust gas recirculation valve is in turn designed as a plug valve, which is inserted into the housing and its Valve seat for cooling immediately adjacent to one between the first and third as well formed between the second and fourth housing shell coolant jacket is arranged.
  • bypass flap is at least indirectly over a temperature-sensitive bimetallic spring controlled. This can be additional Space can be saved as there are no additional control devices for the bypass flap required are.
  • the bimetallic spring of coolant flows around, so that the bypass flap depending on the respective coolant temperature is pivoted. This means that when still cold internal combustion engine and thus not desired cooling of the exhaust gas, the bimetallic spring so is arranged, that the bypass flap is opened, while with sufficient warming of the coolant, the bimetallic spring for a closure of the bypass channel provides.
  • the housing shells each at their bearing surfaces to the other housing shell grooves, in the corresponding Webs of the other housing shell engage and the connection between the superposed housing shells is via an adhesive connection produced.
  • a particularly good efficiency of the cooling device is achieved when the Coolant jacket in the region of the cooling device in cross section the entire circumference the heat exchanger unit surrounds, as an energetically favorable position of Coolant jacket is given to the atmosphere.
  • the webs and the grooves over which the heat exchanger unit forming housing shells are connected in the region of the coolant jacket are arranged, wherein between the exhaust gas flowed through the area Heat exchanger unit and the webs and grooves on both housing shells grooves are formed, which form an air space.
  • This airspace is used for isolation towards the hot exhaust gas, so that a reliable adhesive bond as well is feasible at this point.
  • an exhaust gas recirculation system is thus created, which has an extremely low space requirement and a low weight, wherein at the same time in particular the function of the exhaust gas recirculation valve by the Cooling is ensured and the number of components compared to known designs is further reduced. Furthermore, all housing parts are inexpensive Diecasting produced and optimally matched.
  • Figure 1 shows a sectional view of a frontal view of an inventive first exhaust gas recirculation system, wherein the cutting plane in the region of a bypass channel is arranged and the viewing direction of a cooling device.
  • Figure 2 shows a representation corresponding to Figure 1 for an alternative inventive Exhaust gas recirculation system.
  • Figure 3 shows a sectional view of a side view of the invention Exhaust gas recirculation system of Figure 2 wherein the viewing direction to the exhaust gas inlet is and the cutting plane lies in front of the bypass flap.
  • FIG. 4 shows a top view of the exhaust gas recirculation system according to the invention Figure 1, wherein in the illustration upper housing parts in the region of the heat exchanger are removed.
  • FIG. 5 again shows a frontal view of an exhaust gas recirculation system according to the invention in a sectional view, wherein the sectional plane in the region of a Cooling device is arranged.
  • FIG. 1 The structure of a first embodiment of an exhaust gas recirculation system according to the invention is largely clear from Figure 1. It can be seen that a housing 1 of four housing shells 2, 3, 4, 5 is constructed, which form all functional parts or at least record.
  • the first housing shell 2 forms an exhaust gas inlet 6 and a lower Outside wall 7 of a bypass channel 8. Furthermore, this housing shell forms the second a lower part 9 of an exhaust gas cooling device 10, as shown in Figures 3-5 is.
  • This outer housing shell 2 is replaced by a second housing shell. 3 largely closed, which has an inlet channel 11 and an outlet 12th for the coolant. In addition, it forms an upper part 13 of the exhaust gas cooling device 10 and an upper outer wall 14 of the bypass channel 8.
  • This housing shell 3 is on the housing shell 2 with the interposition of the housing shells. 4 and 5 attached via an adhesive bond.
  • the housing shells 4 and 5 together form a heat exchanger unit 15, which in particular can be seen in Figures 3 to 5.
  • the lower inner housing shell forms 4 a lower part 16 of the heat exchanger unit 15 and a lower inner wall 17 of the bypass channel 8 and forms in an extension of these surfaces Lower part 18 of a housing of an exhaust gas recirculation valve 19.
  • the housing shell. 5 in turn forms a corresponding upper part 20 of the heat exchanger 15 and a upper inner wall 21 of the bypass channel 8 and an upper part 22 of the housing of the Exhaust gas recirculation valve 19.
  • the lower part 18 and the upper part 22 accordingly form in the present embodiment together a receptacle for the exhaust gas recirculation valve 19, which designed as a plug valve.
  • This plug valve 19 is a generic spring-loaded diaphragm valve, which is actuated via a vacuum connection 23 becomes.
  • a membrane 24 is in a known manner between a plug housing part 25 and a cover 26 of the exhaust gas recirculation valve 19 is clamped and is biased by a coil spring 27 in the closing direction, wherein the Spring 27 is supported on its first side against the lid 26 and on the other Side against a arranged on the diaphragm 24 plate 28 is supported.
  • valve closure member 30 is arranged, which in a known manner with a Valve seat 31 corresponds, in the formed by the housing shells 4 and 5 Housing lower part 18 and upper housing part 22 is inserted.
  • Valve seat 31 corresponds, in the formed by the housing shells 4 and 5 Housing lower part 18 and upper housing part 22 is inserted.
  • a bypass flap 33 is arranged, which in one in the housing shell 5 trained upper bearing 34 and in a lower housing shell 4 trained lower bearing 35 is mounted.
  • a lower part 36 of a partition and an upper part 37th formed the intermediate wall, wherein in the formed by the two halves 36,37 Partial wall formed by the bypass flap 33 controlled opening is.
  • the bypass door 33 in the lower bearing 35 only is mounted on a shaft journal 38, the shaft 39 of the bypass valve 33 extends through the upper bearing 34 and is there connected to a lever 40, which in turn is in operative connection with a bimetallic spring 41.
  • This bimetallic spring 41 forms an actuator of the bypass flap 33 and is in a between the housing shell 3 and the housing shell 5 formed coolant jacket 42 arranged so that a circuit of a bypass valve body 43 of the bypass door 33 of the Temperature of the coolant flow is dependent.
  • a seal 46 is arranged is, over which the housing 18, 22 relative to the plug housing part 25, in the seal 46 is arranged in a groove 47 is sealed from atmosphere becomes.
  • An additional sealing ring 48 is arranged in a groove 49 which on the upper and lower outer housing shell 2, 3 is formed and for a Seal between the out, lying housing shells 2, 3 and the lower part 18 and upper part 22 of the valve housing relative to the atmosphere provides.
  • This portion of the housing shells 2 and 3 is formed so that it is around the Valve seat 31 of the exhaust gas recirculation valve 19 protrudes so that it is surrounded by coolant is, which between the housing parts 2, 4 or the housing parts 3, 5 flows and is part of the coolant jacket 42.
  • the embodiment according to FIG. 2 differs from the embodiment according to Figure 1 in that a housing 50 of the exhaust gas recirculation valve 19 completely is formed on the lower housing shell 2 and thus the function of the housing parts 18 and 22 of the first embodiment met.
  • the exhaust outlet is also 32 part of the housing shell 22.
  • the bypass channel 8 is not flowed around by coolant, but its lower part 51 and be Upper part 52 is formed directly through the housing shells 2, 3.
  • the upper housing shell 5 is so executed that it forms an additional space 53 in the area above the Bypass valve 33 is disposed and with the underlying coolant jacket 42nd connected is.
  • the coolant jacket 42 is from the side of the heat exchanger 15 is led up to the housing 50 of the exhaust gas recirculation valve 19, which can be seen in Figure 3, wherein the housing 50, since it is in direct contact with the coolant is, for a good heat transfer in the region of the valve seat 31 ensures that it is cooled by the coolant.
  • the others in comparison for the execution according to Figure 1 functionally identical parts are in Figure 2 with the same Reference numerals marked.
  • FIGS. 3 to 5 show further views of the embodiments according to the invention the exhaust gas recirculation system and in particular the heat exchanger unit 15, shown. So it becomes clear that between the outer housing shells 2 and 3 and the inner housing shells 4 and 5, the coolant jacket 42 is formed.
  • the heat exchanger unit 15 is, apart from the outer wall of the coolant jacket 42, formed by the housing shells 4, 5, at which ribs 54 for an improved Heat transfer are formed, which in the assembled state of the housing shells 4 and 5 face each other.
  • Each centrally arranged in cross section Ribs 55 have such a length that they are in the middle of each other which ensures that the exhaust gas flow with the bypass flap closed must flow through the entire heat exchanger unit 15 and only in the rear Area 56 of the heat exchanger unit 15 is deflected by 180 degrees, so to get to the exhaust outlet.
  • Coolant jacket 42 either in the same direction or opposite, must flow are in turn, on the housing shells 2, 3 in cross section in the middle, ie in extension formed the ribs 55, grooves 44, in which webs 45 of the housing shells 4, 5th intervention. So that the coolant flow from the coolant inlet 11 to the coolant outlet 12, he must thus on the rear portion 56 of the heat exchanger unit 15 flow where the formed by the webs 44 and grooves 45 vertical Partition is no longer formed.
  • the engine By introducing this hot exhaust gas into the intake manifold, the engine becomes fast heated, so that also heats the coolant of the engine faster flows into the coolant jacket 42. Is a switching temperature of the coolant and thus reaches the bimetallic spring 41, the bypass flap 33 is actuated and the Opened between the chambers 57 and 58, so that no more exhaust gas can flow through the bypass channel 8. Instead, then the exhaust gas flows between the ribs 54 of the heat exchanger unit 15 and is in the rear Area 56 deflected by 180 degrees, so that the exhaust gas stream cooled in the second Chamber 58 passes, from where the exhaust gas in turn via the exhaust gas recirculation valve 19 can be performed to the intake manifold.
  • the cooling of the exhaust gas takes place via a heat transfer between the flowing exhaust gas and the ribs 54 of the Heat exchanger unit 15, which by the surrounding coolant jacket 42 flowing coolant to be cooled.
  • the coolant jacket 42 is over the Coolant inlet 11 and the coolant outlet 12 usually with the coolant circuit connected to the internal combustion engine in a known manner.

Abstract

An automotive piston engine has an exhaust gas return system which all important functions within a single housing (1). The components within the unit are an exhaust gas return valve (19), an exhaust gas cooling unit (10) with heat exchanger (15), a by-pass passage (8) with a regulator flap (33). In addition, the exhaust gas return valve has a valve seat (31) that is cooled by a coolant from the exhaust gas cooling unit (10).

Description

Die Erfindung betrifft ein Abgasrückführsystem für eine Verbrennungskraftmaschine mit einem Abgaseinlaß, einem Abgasauslaß und einer Abgaskühlvorrichtung, die eine Wärmetauscheinheit aufweist, die von einem Kühlmittel durchströmt ist, sowie mit einem Bypasskanal über den die Wärmetauschereinheit umgehbar ist und in dem eine Bypassklappe angeordnet ist.The invention relates to an exhaust gas recirculation system for an internal combustion engine with an exhaust gas inlet, an exhaust gas outlet and an exhaust gas cooling device, the one Heat exchange unit, which is flowed through by a coolant, and with a bypass channel through which the heat exchanger unit can be bypassed and in the a bypass flap is arranged.

In bekannten Abgasrückführsystemen wird über einen Abgasrückführkanal das Abgas vom Abgaskrümmer zurück zum Saugrohr der Verbrennungskraftmaschine geführt. Die Regelung des Abgasstromes erfolgt dabei über ein Abgasrückführventil, welches im Abgasrückführkanal angeordnet ist.In known exhaust gas recirculation systems, the exhaust gas is via an exhaust gas recirculation passage led from the exhaust manifold back to the intake manifold of the internal combustion engine. The regulation of the exhaust gas flow takes place via an exhaust gas recirculation valve, which is arranged in the exhaust gas recirculation channel.

Des weiteren ist es bekannt, in den Abgasrückführkanälen Kühlvorrichtungen anzuordnen, so daß das Abgas gekühlt in das Saugrohr zurück geführt wird, wodurch die NOx-Emmissionen verringert werden können. Da beim Start des Motors eine möglichst schnelle Aufheizung des Kühlmittels aber auch eines Katalysators gewünscht ist, wurden Abgasrückführsysteme ausgeführt, bei denen die Abgaskühlvorrichtung über einen Bypasskanal umgehbar, wobei der Bypasskanal von einer Bypassklappe oder einem Bypassventil beherrscht wird.Furthermore, it is known to arrange cooling devices in the exhaust gas recirculation passages, so that the exhaust gas is cooled back into the intake manifold, whereby the NO x emissions can be reduced. Since at the start of the engine the fastest possible heating of the coolant but also of a catalytic converter is desired, exhaust gas recirculation systems have been implemented in which the exhaust gas cooling device can be bypassed via a bypass channel, whereby the bypass channel is controlled by a bypass flap or a bypass valve.

In der DE 198 41 927 A1 wird eine Einrichtung zur Rückführung eines Abgasstromes zum Saugrohr einer Brennkraftmaschine beschrieben, bei der die Abgaskühlvorrichtung mit dem Bypasskanal als Baueinheit ausgeführt ist, bei der die Bypassklappe zwischen einem Abgaseinlaß und einem Abgasauslaß der Kühlvorrichtung angeordnet ist, so daß der Weg durch den Kühler über den Bypasskanal umgangen werden kann. Im weiterführenden Bereich des Abgasrückführkanals ist das die Abgasmenge regelnde Abgasrückführventil angeordnet. Durch die Ausführung des Kühlers mit den Bypasskanal als Baueinheit soll eine kompakte Bauweise mit einer daraus resultierenden Bauraum- und Gewichtsreduzierung erreicht werden.In DE 198 41 927 A1 discloses a device for returning an exhaust gas stream described to the intake manifold of an internal combustion engine, wherein the exhaust gas cooling device executed with the bypass channel as a unit, wherein the bypass flap disposed between an exhaust inlet and an exhaust outlet of the cooling device is, so that the way through the radiator on the bypass channel are bypassed can. In the continuing area of the exhaust gas recirculation channel that is the amount of exhaust gas regulating exhaust gas recirculation valve arranged. By the execution of the cooler with the Bypass channel as a unit should be a compact design with a resulting Space and weight reduction can be achieved.

In der EP 0 916 837 B1 wird eine Vorrichtung zur Abgasrückführung für einen Verbrennungsmotor beschrieben, bei der die Abgaskühlvorrichtung und das Abgasrückführventil als Baueinheit ausgebildet sind, wobei ein Stellelement des Ventils vom strömenden Kühlmittel mit gekühlt wird. Hierdurch soll die thermische Belastung des Stellelementes reduziert werden. Eine Umgehung des Abgaskühlers über einen Bypasskanal ist nicht vorgesehen.EP 0 916 837 B1 discloses a device for exhaust gas recirculation for an internal combustion engine described in which the exhaust gas cooling device and the exhaust gas recirculation valve are designed as a structural unit, wherein an actuating element of the valve is cooled by the flowing coolant. This should be the thermal load of the actuating element can be reduced. A bypass of the exhaust gas cooler over a Bypass channel is not provided.

In der DE 197 40 998 A1 wird ein Abgasrückführsystem für eine Verbrennungskraftmaschine beschrieben, bei der ein Abgasrückführventil an einer Verbindungsbasis befestigt wird, welche wiederum an einer Kühlvorrichtung befestigt ist, die am Saugrohr angeordnet ist. Durch eine solche Ausführung soll die thermische Belastung des Einlaßkrümmers verringert werden. Aufgrund der Ausführung dient die hier vorliegende Kühlvorrichtung jedoch in erster Linie zur thermischen Entkopplung des Saugrohres vom Abgasrückführventil, wobei eine ausreichende Kühlung des Abgases zur Verminderung der NOx-Emission nicht gegeben ist.DE 197 40 998 A1 describes an exhaust gas recirculation system for an internal combustion engine in which an exhaust gas recirculation valve is fastened to a connection base, which in turn is fastened to a cooling device which is arranged on the intake pipe. By such an embodiment, the thermal load of the intake manifold is to be reduced. Due to the design of the present cooling device, however, primarily serves for thermal decoupling of the intake manifold from the exhaust gas recirculation valve, with a sufficient cooling of the exhaust gas to reduce the NO x emission is not given.

Daher ist es Aufgabe der Erfindung ein Abgasrückführsystem zur Verfügung zu stellen, welches auf möglichst geringem Bauraum und mit möglichst weit reduziertem Gewicht alle heute notwendigen Funktionen der Abgasrückführung erfüllt, wobei gleichzeitig auf möglichst kostengünstige Weise die Lebensdauer und Funktion der Bauteile sicher gestellt beziehungsweise erhöht werden soll. Des weiteren sollen alle Bauteile des Abgasrückführsystems optimal aufeinander abgestimmt sein.Therefore, it is an object of the invention to provide an exhaust gas recirculation system, which in the smallest possible space and with as much reduced Weight meets all today necessary functions of exhaust gas recirculation, wherein at the same time in the most cost-effective manner, the life and function of Components should be ensured or increased. Furthermore, everyone should Components of the exhaust gas recirculation system must be optimally matched to each other.

Diese Aufgabe wird dadurch gelöst, daß das Abgasrückführsystem eine Gehäuse aufweist, in dem die Wärmetauschereinheit, die Bypassklappe und ein Gehäuseteil des Abgasrückführventils, in dem zumindest der Ventilsitz angeordnet ist, ausgebildet sind, wobei der Ventilsitz durch das Kühlmittel gekühlt ist, und daß das Abgasrückführventil die Abgaskühlvorrichtung mit der Wärmetauschereinheit und der Bypasskanal mit der Bypassklappe eine Baueinheit bilden. Somit sind alle erforderlichen Funktionen eines modernen Abgasrückführsystems in einer Baueinheit zusammen gefaßt, wobei das Gewicht und der benötigte Bauraum im Vergleich zu bekannten Ausführungen weiter eingeschränkt ist und insbesondere die Funktion des Abgasrückführventils durch die Kühlung des Ventilsitzes zusätzlich sicher gestellt ist, da ein Verkleben eines Ventilgliedes auf dem Ventilsitz durch Verkokung mittels der zusätzlichen Kühlung des Ventilsitzes weitestgehend vermieden wird.This object is achieved in that the exhaust gas recirculation system a housing in which the heat exchanger unit, the bypass flap and a housing part the exhaust gas recirculation valve, in which at least the valve seat is arranged, formed are, wherein the valve seat is cooled by the coolant, and that the exhaust gas recirculation valve the exhaust gas cooling device with the heat exchanger unit and the bypass channel form a structural unit with the bypass flap. Thus, all are required Functions of a modern exhaust gas recirculation system in a single unit taken, where the weight and the required space compared to known Embodiments is further limited and in particular the function of Exhaust gas recirculation valve is additionally ensured by the cooling of the valve seat, as a bonding of a valve member on the valve seat by coking by means of additional cooling of the valve seat is largely avoided.

In einer bevorzugten Ausführungsform ist der Ventilsitz des Abgasrückführventils zwischen dem Bypasskanal beziehungsweise der Wärmetauschereinheit und dem Abgasauslaß angeordnet, wodurch die thermische Belastung insbesondere des Stellelementes des Abgasrückführventils im Vergleich zu Ausführungen bei denen das Abgasrückführventil vor dem Abgaskühler angeordnet ist, verringert wird.In a preferred embodiment, the valve seat of the exhaust gas recirculation valve between the bypass channel or the heat exchanger unit and the Exhaust outlet arranged, whereby the thermal load in particular of Control element of the exhaust gas recirculation valve in comparison to versions in which the exhaust gas recirculation valve is arranged in front of the exhaust gas cooler, is reduced.

In einer vorteilhaften Ausgestaltung der Erfindung sind das Gehäuse des Abgasrückführsystems und die Wärmetauschereinheit aus insgesamt vier Gehäuseschalen, insbesondere Druckgussschalen, aufgebaut. Eine derartige Ausführung minimiert den Montageaufwand des Abgasrückführsystems, wobei gleichzeitig die Formen so gewählt werden können, dass die vier Gehäuseschalen in kostengünstigem Leichtmetalldruckgussverfahren hergestellt werden können.In an advantageous embodiment of the invention, the housing of the exhaust gas recirculation system and the heat exchanger unit of a total of four housing shells, in particular die-cast shells, constructed. Such a design minimizes the assembly work of the exhaust gas recirculation system, at the same time the forms can be chosen so that the four housing shells in cost Alloy die casting process can be produced.

In einer bevorzugten Ausführungsform bildet die erste Gehäuseschale den Abgaseinlaß, ein Unterteil der Abgaskühlvorrichtung sowie eine untere Außenwand des Bypasskanals, die zweite Gehäuseschale ein Oberteil der Abgaskühlvorrichtung mit einem Kühlmitteleinlaß und einem Kühlmittelauslaß und eine obere Außenwand des Bypasskanals, die dritte Gehäuseschale ein Unterteil der Wärmetauschereinheit und des Gehäuses des Abgasrückführventils, den Abgasauslaß und eine untere Innenwand des Bypasskanals sowie einen unteren Teil einer Zwischenwand, in der die Bypassklappe angeordnet ist und die eine untere Lagerstelle der Bypassklappe aufweist und die vierte Gehäuseschale ein Oberteil der Wärmetauschereinheit und des Gehäuses des Abgasrückführventils eine obere Innenwand des Bypasskanals sowie einen oberen Teil einer Zwischenwand, in der die Bypassklappe angeordnet ist und die eine obere Lagerstelle der Bypassklappe aufweist. Durch eine derartige Aufteilung der Funktionen auf die vier Gehäuseschalen ergibt sich eine einfache Formgebung, so daß die Gehäuseschalen im Druckgußverfahren hergestellt werden können. Zudem ergibt sich eine geringe Anzahl an einfach zu montierenden Einzelbauteilen sowie ein reduzierter Bauraumbedarf. In a preferred embodiment, the first housing shell forms the exhaust gas inlet, a lower part of the exhaust gas cooling device and a lower outer wall of the Bypass, the second housing shell an upper part of the exhaust gas cooling device with a coolant inlet and a coolant outlet and an upper outer wall of the Bypass, the third housing shell, a lower part of the heat exchanger unit and the housing of the exhaust gas recirculation valve, the exhaust gas outlet and a lower inner wall the bypass channel and a lower part of a partition, in which the Bypass flap is arranged and having a lower bearing point of the bypass valve and the fourth housing shell an upper part of the heat exchanger unit and the Housing of the exhaust gas recirculation valve, an upper inner wall of the bypass channel as well an upper part of an intermediate wall, in which the bypass flap is arranged and which has an upper bearing point of the bypass flap. By such a division the functions on the four housing shells results in a simple design, so that the housing shells can be produced by die casting. In addition, results in a small number of easy to install individual components and a reduced space requirement.

In einer dazu weiterführenden Ausführungsform ist das Abgasrückführventil als Steckventil ausgeführt, welches in das Gehäuse eingesetzt ist und dessen Ventilsitz zur Kühlung vom Kühlmittel umströmt ist. Die Ausführung des Abgasrückführventils als Steckventil vereinfacht wiederum die Montage während die Umströmung des Ventilsitzes mit Kühlmittel die kühlende Wirkung auf das Gehäuse beziehungsweise den Ventilsitz des Abgasrückführventils optimiert, so daß Verklebungen des Abgasrückführventils zuverlässig vermieden werden.In a further embodiment, the exhaust gas recirculation valve is as Plug valve executed, which is inserted into the housing and its valve seat flows around the cooling of the coolant for cooling. The design of the exhaust gas recirculation valve as a plug valve in turn simplifies the assembly during the flow around the Valve seat with coolant the cooling effect on the housing respectively optimizes the valve seat of the exhaust gas recirculation valve, so that adhesions of the exhaust gas recirculation valve reliably avoided.

In einer alternativen Ausführungsform bildet die erste Gehäuseschale den Abgaseinlaß, den Abgasauslaß, ein Unterteil der Abgaskühlvorrichtung und des Bypasskanals sowie das Gehäuse des Abgasrückführventils, die zweite Gehäuseschale ein Oberteil der Abgaskühlvorrichtung mit einem Kühlmitteleinlaß und einem Kühlmittelauslaß und des Bypasskanals, die dritte Gehäuseschale ein Unterteil der Wärmetauschereinheit einen unteren Teil einer Zwischenwand, in der die Bypassklappe angeordnet ist und die eine untere Lagerstelle der Bypassklappe aufweist, und die vierte Gehäuseschale ein Oberteil der Wärmetauschereinheit und einen oberen Teil einer Zwischenwand, in der die Bypassklappe angeordnet ist und die eine obere Lagerstelle der Bypassklappe aufweist. Auch ein solches Gehäusesystem ist komplett im Druckgußverfahren herzustellen und weist aufgrund der Umströmung der Wärmetauschereinheit mit dem Kühlmittel einen sehr guten Wärmeübergang auf, wobei ebenfalls eine einfache Montage der Gehäuseschalen gewährleistet ist. Gegenüber der alternativen Ausführungsform besteht zudem der Vorteil, dass durch die einteilige Ausführung des Abgasrückführventilgehäuses eine zusätzliche Abdichtung zwischen den Gehäusehälften in diesem Bereich nicht erforderlich ist.In an alternative embodiment, the first housing shell forms the exhaust gas inlet, the exhaust gas outlet, a lower part of the exhaust gas cooling device and the bypass channel and the housing of the exhaust gas recirculation valve, the second housing shell Upper part of the exhaust gas cooling device with a coolant inlet and a coolant outlet and the bypass channel, the third housing shell a lower part of the heat exchanger unit a lower part of an intermediate wall, in which the bypass flap is arranged is and which has a lower bearing point of the bypass valve, and the fourth housing shell an upper part of the heat exchanger unit and an upper part an intermediate wall, in which the bypass flap is arranged and the upper bearing point the bypass flap has. Even such a housing system is complete produced by die casting and has due to the flow around the heat exchanger unit with the coolant to a very good heat transfer, wherein also a simple assembly of the housing shells is guaranteed. Across from the alternative embodiment also has the advantage that by the one-piece Execution of the exhaust gas recirculation valve housing an additional seal between the housing halves in this area is not required.

In einer dazu weiterführenden Ausführungsform ist das Abgasrückführventil wiederum als Steckventil ausgeführt, welches in das Gehäuse eingesetzt ist und dessen Ventilsitz zur Kühlung unmittelbar neben einem zwischen der ersten und dritten sowie zwischen der zweiten und vierten Gehäuseschale ausgebildeten Kühlmittelmantel angeordnet ist. Auf diese Weise wird eine Kühlung des Ventilsitzes unter Beibehaltung der oben genannten Vorteile erzielt, wobei im Vergleich zur alternativen Ausführungsform eine etwas geringere Wirkung des Kühlmittels auf den Ventilsitz vorhanden ist. In a further embodiment, the exhaust gas recirculation valve is in turn designed as a plug valve, which is inserted into the housing and its Valve seat for cooling immediately adjacent to one between the first and third as well formed between the second and fourth housing shell coolant jacket is arranged. In this way, a cooling of the valve seat while maintaining achieved the above advantages, compared to the alternative Embodiment a slightly lower effect of the coolant on the valve seat is available.

In einer bevorzugten Ausführungsform ist die Bypassklappe zumindest indirekt über eine temperaturempfindliche Bimetallfeder gesteuert. Hierdurch kann zusätzlicher Bauraum eingespart werden da weitere Stelleinrichtungen für die Bypassklappe nicht erforderlich sind.In a preferred embodiment, the bypass flap is at least indirectly over a temperature-sensitive bimetallic spring controlled. This can be additional Space can be saved as there are no additional control devices for the bypass flap required are.

In einer dazu weiterführenden Ausführungsform ist die Bimetallfeder von Kühlmittel umströmt, so daß die Bypassklappe in Abhängigkeit von der jeweiligen Kühlmitteltemperatur geschwenkt wird. Dies bedeutet, daß bei noch kalter Verbrennungskraftmaschine und somit nicht gewünschter Kühlung des Abgases die Bimetallfeder so angeordnet ist, daß die Bypassklappe geöffnet ist, während bei ausreichender Erwärmung des Kühlmittels die Bimetallfeder für einen Verschluß des Bypasskanals sorgt.In a further embodiment, the bimetallic spring of coolant flows around, so that the bypass flap depending on the respective coolant temperature is pivoted. This means that when still cold internal combustion engine and thus not desired cooling of the exhaust gas, the bimetallic spring so is arranged, that the bypass flap is opened, while with sufficient warming of the coolant, the bimetallic spring for a closure of the bypass channel provides.

In einer vorteilhaften Ausgestaltung in der Erfindung weisen die Gehäuseschalen jeweils an ihren Auflageflächen zur anderen Gehäuseschale Nuten auf, in die korrespondierende Stege der jeweils anderen Gehäuseschale eingreifen und die Verbindung zwischen den aufeinander liegenden Gehäuseschalen ist über eine Klebeverbindung hergestellt. Somit ist der Zusammenbau des Abgasrückführsystems in einfacher und kostengünstiger Weise durchzuführen, da zeitaufwendige Schweiß- oder Schraubverbindungen entfallen und das gesamte Abgasrückführsystem durch einfaches aufeinandersetzen der Schale zusammen gebaut werden kann.In an advantageous embodiment of the invention, the housing shells each at their bearing surfaces to the other housing shell grooves, in the corresponding Webs of the other housing shell engage and the connection between the superposed housing shells is via an adhesive connection produced. Thus, the assembly of the exhaust gas recirculation system is easier and cost-effective manner, since time-consuming welding or Screw connections omitted and the entire exhaust gas recirculation system by simple put together the shell can be assembled together.

Ein besonders guter Wirkungsgrad der Kühleinrichtung wird erreicht, wenn der Kühlmittelmantel im Bereich der Kühleinrichtung im Querschnitt den gesamten Umfang der Wärmetauschereinheit umgibt, da eine energetisch günstige Lage des Kühlmittelmantels zur Atmosphäre gegeben ist.A particularly good efficiency of the cooling device is achieved when the Coolant jacket in the region of the cooling device in cross section the entire circumference the heat exchanger unit surrounds, as an energetically favorable position of Coolant jacket is given to the atmosphere.

Vorteilhafterweise sind die Stege und die Nuten, über welche die die Wärmetauschereinheit bildenden Gehäuseschalen verbunden sind im Bereich des Kühlmittelmantels angeordnet sind, wobei zwischen dem abgasdurchströmten Bereich der Wärmetauschereinheit und den Stegen und Nuten an beiden Gehäuseschalen Nuten ausgebildet sind, welche einen Luftraum bilden. Dieser Luftraum dient zur Isolation gegenüber dem heißen Abgas, so dass eine zuverlässige Klebeverbindung auch an dieser Stelle realisierbar ist.Advantageously, the webs and the grooves over which the heat exchanger unit forming housing shells are connected in the region of the coolant jacket are arranged, wherein between the exhaust gas flowed through the area Heat exchanger unit and the webs and grooves on both housing shells grooves are formed, which form an air space. This airspace is used for isolation towards the hot exhaust gas, so that a reliable adhesive bond as well is feasible at this point.

Durch die genannten Ausführungen wird somit ein Abgasrückführsystem geschaffen, welches einen extrem geringen Bauraumbedarf und ein geringes Gewicht aufweist, wobei gleichzeitig insbesondere die Funktion des Abgasrückführventils durch die Kühlung sicher gestellt wird und die Bauteileanzahl im Vergleich zu bekannten Ausführungen weiter reduziert wird. Des weiteren sind alle Gehäuseteile in kostengünstigen Druckgußverfahren herstellbar und optimal aufeinander abgestimmt.By the aforementioned embodiments, an exhaust gas recirculation system is thus created, which has an extremely low space requirement and a low weight, wherein at the same time in particular the function of the exhaust gas recirculation valve by the Cooling is ensured and the number of components compared to known designs is further reduced. Furthermore, all housing parts are inexpensive Diecasting produced and optimally matched.

Zwei Ausführungsbeispiele erfindungsgemäßer Abgasrückführsysteme sind in den Zeichnungen dargestellt und werden nachfolgend beschrieben.Two embodiments of inventive exhaust gas recirculation systems are in the Drawings are shown and described below.

Figur 1 zeigt in geschnittener Darstellung eine Frontalansicht eines erfindungsgemäßen ersten Abgasrückführsystems, wobei die Schnittebene im Bereich eines Bypasskanals angeordnet ist und die Blickrichtung von einer Kühlvorrichtung aus ist.Figure 1 shows a sectional view of a frontal view of an inventive first exhaust gas recirculation system, wherein the cutting plane in the region of a bypass channel is arranged and the viewing direction of a cooling device.

Figur 2 zeigt eine Darstellung entsprechend der Figur 1 für ein alternatives erfindungsgemäßes Abgasrückführsystem.Figure 2 shows a representation corresponding to Figure 1 for an alternative inventive Exhaust gas recirculation system.

Figur 3 zeigt in geschnittener Darstellung eine Seitenansicht des erfindungsgemäßen Abgasrückführsystems aus Figur 2 wobei die Blickrichtung zum Abgaseinlaß ist und die Schnittebene vor der Bypassklappe liegt.Figure 3 shows a sectional view of a side view of the invention Exhaust gas recirculation system of Figure 2 wherein the viewing direction to the exhaust gas inlet is and the cutting plane lies in front of the bypass flap.

Figur 4 zeigt eine Draufsicht des erfindungsgemäßen Abgasrückführsystems gemäß Figur 1, wobei in der Darstellung obere Gehäuseteile im Bereich des Wärmetauschers entfernt sind.FIG. 4 shows a top view of the exhaust gas recirculation system according to the invention Figure 1, wherein in the illustration upper housing parts in the region of the heat exchanger are removed.

Figur 5 zeigt wiederum eine Frontalansicht eines erfindungsgemäßen Abgasrückführsystems in geschnittener Darstellung, wobei die Schnittebene im Bereich einer Kühlvorrichtung angeordnet ist.FIG. 5 again shows a frontal view of an exhaust gas recirculation system according to the invention in a sectional view, wherein the sectional plane in the region of a Cooling device is arranged.

Der Aufbau einer ersten Ausführungsform eines erfindungsgemäßen Abgasrückführsystems wird größtenteils aus Figur 1 deutlich. Es ist zu erkennen, daß ein Gehäuse 1 aus vier Gehäuseschalen 2, 3, 4, 5 aufgebaut ist, die alle funktionalen Teile bilden oder zumindest aufnehmen.The structure of a first embodiment of an exhaust gas recirculation system according to the invention is largely clear from Figure 1. It can be seen that a housing 1 of four housing shells 2, 3, 4, 5 is constructed, which form all functional parts or at least record.

Im einzelnen bildet die erste Gehäuseschale 2 einen Abgaseinlaß 6 sowie eine untere Außenwand 7 eines Bypasskanals 8. Des weiteren bildet diese Gehäuseschale 2 ein Unterteil 9 einer Abgaskühlvorrichtung 10, wie in den Figuren 3-5 zu erkennen ist. Diese außen liegende Gehäuseschale 2 wird durch eine zweite Gehäuseschale 3 weitestgehend verschlossen, welche einen Einlaßkanal 11 und einen Auslaßkanal 12 für das Kühlmittel aufweist. Zusätzlich bildet es ein Oberteil 13 der Abgaskühlvorrichtung 10 sowie eine obere Außenwand 14 des Bypasskanals 8. Diese Gehäuseschale 3 wird an der Gehäuseschale 2 unter Zwischenlage der Gehäuseschalen 4 und 5 über eine Klebeverbindung befestigt.In detail, the first housing shell 2 forms an exhaust gas inlet 6 and a lower Outside wall 7 of a bypass channel 8. Furthermore, this housing shell forms the second a lower part 9 of an exhaust gas cooling device 10, as shown in Figures 3-5 is. This outer housing shell 2 is replaced by a second housing shell. 3 largely closed, which has an inlet channel 11 and an outlet 12th for the coolant. In addition, it forms an upper part 13 of the exhaust gas cooling device 10 and an upper outer wall 14 of the bypass channel 8. This housing shell 3 is on the housing shell 2 with the interposition of the housing shells. 4 and 5 attached via an adhesive bond.

Innerhalb dieser außen liegenden Gehäuseschalen 2, 3 liegen somit die Gehäuseschalen 4 und 5 die gemeinsam eine Wärmetauschereinheit 15 bilden, welche insbesondere in den Figuren 3 bis 5 zu erkennen ist. Dabei bildet die untere innere Gehäuseschale 4 ein Unterteil 16 der Wärmetauschereinheit 15 sowie eine untere Innenwand 17 des Bypasskanals 8 und bildet in einem Fortsatz dieser Flächen ein Unterteil 18 eines Gehäuses eines Abgasrückführventils 19. Die Gehäuseschale 5 wiederum bildet entsprechend ein Oberteil 20 des Wärmetauschers 15 sowie eine obere Innenwand 21 des Bypasskanals 8 und ein Oberteil 22 des Gehäuses des Abgasrückführventils 19.Within these outer housing shells 2, 3 are thus the housing shells 4 and 5 together form a heat exchanger unit 15, which in particular can be seen in Figures 3 to 5. In this case, the lower inner housing shell forms 4 a lower part 16 of the heat exchanger unit 15 and a lower inner wall 17 of the bypass channel 8 and forms in an extension of these surfaces Lower part 18 of a housing of an exhaust gas recirculation valve 19. The housing shell. 5 in turn forms a corresponding upper part 20 of the heat exchanger 15 and a upper inner wall 21 of the bypass channel 8 and an upper part 22 of the housing of the Exhaust gas recirculation valve 19.

Das Unterteil 18 und das Oberteil 22 bilden dementsprechend im vorliegenden Ausführungsbeispiel gemeinsam eine Aufnahme für das Abgasrückführventil 19, welches als Steckventil ausgeführt ist. Dieses Steckventil 19 ist ein gattungsgemäßes federbelastetes Membranventil, welches über einen Unterdruckanschluss 23 angesteuert wird. Eine Membran 24 ist dazu in bekannter Weise zwischen einem Steckgehäuseteil 25 und einem Deckel 26 des Abgasrückführventils 19 eingeklemmt und wird über eine Schraubenfeder 27 in Schließrichtung vorgespannt, wobei sich die Feder 27 an ihrer ersten Seite gegen den Deckel 26 abstützt und auf der anderen Seite gegen eine auf der Membran 24 angeordnete Platte 28 abstützt. Die Membran 24 beziehungsweise die Platte 28 sind mit einer Ventilstange 29 verbunden an deren Ende ein Ventilschließglied 30 angeordnet ist, welches in bekannter Weise mit einem Ventilsitz 31 korrespondiert, der in das durch die Gehäuseschalen 4 und 5 gebildete Gehäuseunterteil 18 beziehungsweise Gehäuseoberteil 22 eingelassen ist. Durch Abheben des Ventilschließgliedes 30 vom Ventilsitz 31 wird eine fluidische Verbindung zu einem Abgasauslaß 32 hergestellt, der auch im Unterteil 18 des Abgasrückführventilgehäuses beziehungsweise in der Gehäuseschale 4 ausgebildet ist.The lower part 18 and the upper part 22 accordingly form in the present embodiment together a receptacle for the exhaust gas recirculation valve 19, which designed as a plug valve. This plug valve 19 is a generic spring-loaded diaphragm valve, which is actuated via a vacuum connection 23 becomes. A membrane 24 is in a known manner between a plug housing part 25 and a cover 26 of the exhaust gas recirculation valve 19 is clamped and is biased by a coil spring 27 in the closing direction, wherein the Spring 27 is supported on its first side against the lid 26 and on the other Side against a arranged on the diaphragm 24 plate 28 is supported. The membrane 24 and the plate 28 are connected to a valve rod 29 at the End a valve closure member 30 is arranged, which in a known manner with a Valve seat 31 corresponds, in the formed by the housing shells 4 and 5 Housing lower part 18 and upper housing part 22 is inserted. By Lifting the valve closure member 30 from the valve seat 31 becomes a fluidic connection made to an exhaust gas outlet 32, which is also in the lower part 18 of the exhaust gas recirculation valve housing or in the housing shell 4 is formed.

Im Bypasskanal 8 ist eine Bypassklappe 33 angeordnet, welche in einer in der Gehäuseschale 5 ausgebildeten oberen Lagerstelle 34 und in einer in der unteren Gehäuseschale 4 ausgebildeten unteren Lagerstelle 35 gelagert ist. Um einen Verschluß des Bypasskanals 8 durch die Bypassklappe 33 zu erreichen, ist an den Gehäuseschalen 4 und 5 ein unterer Teil 36 einer Zwischenwand und ein oberer Teil 37 der Zwischenwand ausgebildet, wobei in der durch die beiden Hälften 36,37 ausgebildeten Zwischenwand eine durch die Bypassklappe 33 beherrschte Öffnung ausgebildet ist. Während die Bypassklappe 33 in der unteren Lagerstelle 35 lediglich über einen Wellenzapfen 38 gelagert ist, reicht die Welle 39 der Bypassklappe 33 durch die obere Lagerstelle 34 hindurch und ist dort mit einem Hebel 40 verbunden, der wiederum mit einer Bimetallfeder 41 in Wirkverbindung steht. Diese Bimetallfeder 41 bildet ein Stellglied der Bypassklappe 33 und ist in einem zwischen der Gehäuseschale 3 und der Gehäuseschale 5 gebildeten Kühlmittelmantel 42 angeordnet, so daß eine Schaltung eines Bypassklappenkörpers 43 der Bypassklappe 33 von der Temperatur des Kühlmittelstromes abhängig ist.In the bypass channel 8, a bypass flap 33 is arranged, which in one in the housing shell 5 trained upper bearing 34 and in a lower housing shell 4 trained lower bearing 35 is mounted. To a lock of the bypass channel 8 to reach through the bypass flap 33 is on the housing shells 4 and 5, a lower part 36 of a partition and an upper part 37th formed the intermediate wall, wherein in the formed by the two halves 36,37 Partial wall formed by the bypass flap 33 controlled opening is. While the bypass door 33 in the lower bearing 35 only is mounted on a shaft journal 38, the shaft 39 of the bypass valve 33 extends through the upper bearing 34 and is there connected to a lever 40, which in turn is in operative connection with a bimetallic spring 41. This bimetallic spring 41 forms an actuator of the bypass flap 33 and is in a between the housing shell 3 and the housing shell 5 formed coolant jacket 42 arranged so that a circuit of a bypass valve body 43 of the bypass door 33 of the Temperature of the coolant flow is dependent.

Die Verbindung der Gehäuseschalen 2, 3, 4, 5 untereinander erfolgt jeweils über Nuten 44, in welche Stege 45 der jeweils anderen Gehäuseschale 2, 3, 4, 5 eingreifen, wobei die feste Verbindung durch Kleben an diesen Stellen erreicht wird. Um auf diese Weise auch die Gehäuseschalen 4, 5 miteinander zu verbinden, sollte die Klebestelle mit den Nuten 44 und den Stegen 45 in den Bereich des Kühlmittelmantels 42 verschoben werden. Dazu kann an den aufeinanderliegenden Enden der Gehäuseschalen 4, 5 eine flanschartige Erweiterung ausgeführt werden, an deren zur Wärmetauschereinheit 15 weisenden Enden in beiden Gehäuseschalen 4, 5 eine Nut ausgebildet ist, so dass zwischen Klebestelle, also im Bereich der Nut 44 und des Steges 45 ein Luftraum entsteht, der die Klebestelle vor zu großer thermischer Belastung vor dem Abgas schützt. Dies ist in den Figuren nicht dargestellt. The connection of the housing shells 2, 3, 4, 5 with each other via Grooves 44 in which webs 45 of the respective other housing shell 2, 3, 4, 5 engage, wherein the solid compound is achieved by gluing at these locations. In order to This way, the housing shells 4, 5 to connect with each other, should the splice with the grooves 44 and the webs 45 in the region of the coolant jacket 42 are moved. This can be done on the superimposed ends of the housing shells 4, 5 a flange-like extension are executed, at the to Heat exchanger unit 15 facing ends in two housing shells 4, 5 a Groove is formed so that between splice, ie in the region of the groove 44 and of the bridge 45 an air space is created, which protects the splice from too much thermal Protects load from the exhaust. This is not shown in the figures.

Des weiteren ist aus Figur 1 ersichtlich, daß am Steckventil 19 eine Dichtung 46 angeordnet ist, über die das Gehäuse 18, 22 gegenüber dem Steckgehäuseteil 25, in dem die Dichtung 46 in einer Nut 47 angeordnet ist gegenüber Atmosphäre abgedichtet wird. Ein zusätzlicher Dichtring 48 ist in einer Nut 49 angeordnet, die an der oberen und der unteren äußeren Gehäuseschale 2, 3 ausgebildet ist und für eine Abdichtung zwischen den außer,liegenden Gehäuseschalen 2, 3 und dem Unterteil 18 beziehungsweise Oberteil 22 des Ventilgehäuses gegenüber der Atmosphäre sorgt. Dieser Bereich der Gehäuseschalen 2 und 3 ist so ausgebildet, daß er um den Ventilsitz 31 des Abgasrückführventils 19 ragt, so daß dieser von Kühlmittel umgeben ist, welches zwischen den Gehäuseteilen 2, 4 beziehungsweise den Gehäuseteilen 3, 5 strömt und Teil des Kühlmittelmantels 42 ist.Furthermore, it can be seen from Figure 1 that the plug valve 19, a seal 46 is arranged is, over which the housing 18, 22 relative to the plug housing part 25, in the seal 46 is arranged in a groove 47 is sealed from atmosphere becomes. An additional sealing ring 48 is arranged in a groove 49 which on the upper and lower outer housing shell 2, 3 is formed and for a Seal between the out, lying housing shells 2, 3 and the lower part 18 and upper part 22 of the valve housing relative to the atmosphere provides. This portion of the housing shells 2 and 3 is formed so that it is around the Valve seat 31 of the exhaust gas recirculation valve 19 protrudes so that it is surrounded by coolant is, which between the housing parts 2, 4 or the housing parts 3, 5 flows and is part of the coolant jacket 42.

Die Ausführungsform gemäß Figur 2 unterscheidet sich von der Ausführungsform gemäß Figur 1 dadurch, daß ein Gehäuse 50 des Abgasrückführventils 19 komplett an der unteren Gehäuseschale 2 ausgebildet ist und somit die Funktion der Gehäuseteile 18 und 22 des ersten Ausführungsbeispiels erfüllt. Zusätzlich ist auch der Abgasauslaß 32 Teil der Gehäuseschale 22. Des weiteren ist zu erkennen, daß der Bypasskanal 8 nicht von Kühlmittel umströmt ist, sondern sein Unterteil 51 und sein Oberteil 52 direkt durch die Gehäuseschalen 2, 3 gebildet wird. Um eine Umströmung der Bimetallfeder 41 dennoch zu erreichen, ist die obere Gehäuseschale 5 so ausgeführt, daß sie einen zusätzlichen Raum 53 bildet, der im Bereich oberhalb der Bypassklappe 33 angeordnet ist und mit dem dahinter liegenden Kühlmittelmantel 42 verbunden ist. Der Kühlmittelmantel 42 ist dabei von der Seite des Wärmetauschers 15 bis unmittelbar an das Gehäuse 50 des Abgasrückführventils 19 heran geführt, was in Figur 3 zu erkennen ist, wobei das Gehäuse 50, da es in direktem Kontakt mit dem Kühlmittel steht, für einen guten Wärmeübergang in den Bereich des Ventilsitzes 31 sorgt, so daß dieser durch das Kühlmittel gekühlt wird. Die weiteren im Vergleich zur Ausführung gemäß Figur 1 funktionsgleichen Teile sind in Figur 2 mit gleichen Bezugsziffern gekennzeichnet.The embodiment according to FIG. 2 differs from the embodiment according to Figure 1 in that a housing 50 of the exhaust gas recirculation valve 19 completely is formed on the lower housing shell 2 and thus the function of the housing parts 18 and 22 of the first embodiment met. In addition, the exhaust outlet is also 32 part of the housing shell 22. Furthermore, it can be seen that the bypass channel 8 is not flowed around by coolant, but its lower part 51 and be Upper part 52 is formed directly through the housing shells 2, 3. Around a flow around the bimetallic spring 41 still reach, the upper housing shell 5 is so executed that it forms an additional space 53 in the area above the Bypass valve 33 is disposed and with the underlying coolant jacket 42nd connected is. The coolant jacket 42 is from the side of the heat exchanger 15 is led up to the housing 50 of the exhaust gas recirculation valve 19, which can be seen in Figure 3, wherein the housing 50, since it is in direct contact with the coolant is, for a good heat transfer in the region of the valve seat 31 ensures that it is cooled by the coolant. The others in comparison for the execution according to Figure 1 functionally identical parts are in Figure 2 with the same Reference numerals marked.

In den Figuren 3 bis 5 sind weitere Ansichten der erfindungsgemäßen Ausführungsformen des Abgasrückführsystems und insbesondere der Wärmetauschereinheit 15, dargestellt. So wird deutlich, dass zwischen den äußeren Gehäuseschalen 2 und 3 und den inneren Gehäuseschalen 4 und 5 der Kühlmittelmantel 42 ausgebildet ist. FIGS. 3 to 5 show further views of the embodiments according to the invention the exhaust gas recirculation system and in particular the heat exchanger unit 15, shown. So it becomes clear that between the outer housing shells 2 and 3 and the inner housing shells 4 and 5, the coolant jacket 42 is formed.

Des weiteren ist die Anordnung der Bypassklappe 33 zu erkennen. Die Wärmetauschereinheit 15 wird, abgesehen von der Außenwand des Kühlmittelmantels 42, durch die Gehäuseschalen 4, 5 gebildet, an denen Rippen 54 für einen verbesserten Wärmeübergang ausgebildet sind, welche im zusammen gebauten Zustand der Gehäuseschalen 4 und 5 zueinander weisen. Die jeweils im Querschnitt mittig angeordneten Rippen 55 weisen eine derartige Länge auf, daß sie in der Mitte aneinander stoßen, wodurch gewährleistet wird, daß der Abgasstrom bei geschlossener Bypassklappe durch die gesamte Wärmetauschereinheit 15 strömen muß und erst im hinteren Bereich 56 der Wärmetauschereinheit 15 um 180 Grad umgelenkt wird, um so zum Abgasauslaß zu gelangen. Damit auch der Kühlmittelstrom über diesen Weg im Kühlmittelmantel 42 entweder gleichsinnig oder entgegengesetzt, strömen muß, sind wiederum an den Gehäuseschalen 2, 3 im Querschnitt mittig, also in Verlängerung der Rippen 55, Nuten 44 ausgebildet, in welche Stege 45 der Gehäuseschalen 4, 5 eingreifen. Damit der Kühlmittelstrom vom Kühlmitteleinlaß 11 zum Kühlmittelauslaß 12 gelangen kann, muss er somit über den hinteren Bereich 56 der Wärmetauschereinheit 15 strömen, wo die durch die Stege 44 und Nuten 45 gebildete vertikale Trennwand nicht mehr ausgebildet ist. Dieser Kühlmittelweg aber auch der Weg des Abgasstroms geht insbesondere aus Figur 4 hervor, wobei zu erkennen ist, daß die aufeinander stehenden Rippen 55 entsprechend nicht im hinteren Bereich 56 ausgebildet sind und die Rippen 54 mit einer Umlenkung von 180 Grad ausgebildet sind.Furthermore, the arrangement of the bypass flap 33 can be seen. The heat exchanger unit 15 is, apart from the outer wall of the coolant jacket 42, formed by the housing shells 4, 5, at which ribs 54 for an improved Heat transfer are formed, which in the assembled state of the housing shells 4 and 5 face each other. Each centrally arranged in cross section Ribs 55 have such a length that they are in the middle of each other which ensures that the exhaust gas flow with the bypass flap closed must flow through the entire heat exchanger unit 15 and only in the rear Area 56 of the heat exchanger unit 15 is deflected by 180 degrees, so to get to the exhaust outlet. So that the coolant flow over this way in Coolant jacket 42 either in the same direction or opposite, must flow are in turn, on the housing shells 2, 3 in cross section in the middle, ie in extension formed the ribs 55, grooves 44, in which webs 45 of the housing shells 4, 5th intervention. So that the coolant flow from the coolant inlet 11 to the coolant outlet 12, he must thus on the rear portion 56 of the heat exchanger unit 15 flow where the formed by the webs 44 and grooves 45 vertical Partition is no longer formed. This coolant way but also the way of the Exhaust gas flow is apparent in particular from Figure 4, wherein it can be seen that the corresponding ribs 55 are not formed in the rear portion 56 accordingly are and the ribs 54 are formed with a deflection of 180 degrees.

Die Funktionsweise dieses erfindungsgemäßen Abgasrückführsystems wird im folgenden beschrieben. Bei geöffnetem Abgasrückführventil 19 also bei Abheben des Ventilgliedes 30 vom Ventilsitz 31 strömt ein Abgasstrom in den Abgaseinlaß und in eine erste Kammer 57, welche im Ausführungsbeispiel gemäß Figur 1 durch die Gehäuseschalen 2 bzw. 4 und 5 oder gemäß Figur 2 die Gehäuseschalen 2 und 3 begrenzt ist. Bei kaltem Verbrennungsmotor und somit kaltem Kühlmittel im Kühlmittelmantel 42 bewirkt die Bimetallfeder 41, die im Kühlmittelmantel 42 angeordnet ist, ein Öffnen des Bypassklappenkörpers 43, so daß das Abgas ungekühlt in eine zweite Kammer 58 hinter der Bypassklappe 33 strömen kann, welche im ersten Ausführungsbeispiel durch die Gehäuseschalen 4 und 5 im zweiten Ausführungsbeispiel durch die Gehäuseschalen 2 und 3 gebildet wird. Von hier aus strömt das Abgas am Ventilsitz 31 beziehungsweise dem Ventilschließglied 30 vorbei in das Gehäuse 18, 22 oder 50 des Abgasrückführventils 19, welches entweder durch die Gehäuseschalen 4 und 5 oder durch die Gehäuseschale 2 gebildet wird. Von hier aus wiederum gelangt der Abgasstrom zum Abgasauslaß 32, von wo aus er weiter zum Saugrohr des Verbrennungsmotors strömt.The operation of this exhaust gas recirculation system according to the invention will be described below described. When the exhaust gas recirculation valve 19 is open so when lifting the Valve member 30 from the valve seat 31 flows a flow of exhaust gas into the exhaust inlet and in a first chamber 57, which in the embodiment of Figure 1 by the housing shells 2 or 4 and 5 or according to Figure 2, the housing shells 2 and 3 limited is. With a cold combustion engine and thus cold coolant in the coolant jacket 42 causes the bimetallic spring 41, which is arranged in the coolant jacket 42, opening the bypass valve body 43, so that the exhaust gas uncooled in a second chamber 58 can flow behind the bypass flap 33, which in the first Embodiment by the housing shells 4 and 5 in the second embodiment is formed by the housing shells 2 and 3. From here, the exhaust gas flows on the valve seat 31 and the valve closing member 30 over into the housing 18, 22 or 50 of the exhaust gas recirculation valve 19, which either through the housing shells 4 and 5 or through the housing shell 2 is formed. From here in turn, the exhaust gas flow reaches the exhaust gas outlet 32, from where it continues to Suction pipe of the internal combustion engine flows.

Durch das Einleiten dieses heißen Abgases in das Saugrohr wird der Motor schnell aufgeheizt, so daß ebenfalls das Kühlmittel des Verbrennungsmotors schneller erwärmt in den Kühlmittelmantel 42 strömt. Ist eine Schalttemperatur des Kühlmittels und somit der Bimetallfeder 41 erreicht, so wird die Bypassklappe 33 betätigt und die Öffnung zwischen den Kammern 57 und 58 verschlossen, so daß kein Abgas mehr durch den Bypasskanal 8 strömen kann. Statt dessen strömt dann das Abgas zwischen den Rippen 54 der Wärmetauschereinheit 15 hindurch und wird im hinteren Bereich 56 um 180 Grad umgelenkt, so daß der Abgasstrom gekühlt in die zweite Kammer 58 gelangt, von wo aus das Abgas wiederum über das Abgasrückführventil 19 zum Saugrohr geführt werden kann. Die Kühlung des Abgases erfolgt dabei über einen Wärmeübergang zwischen dem strömenden Abgas und den Rippen 54 der Wärmetauschereinheit 15, welche durch das im umgebenden Kühlmittelmantel 42 strömende Kühlmittel gekühlt werden. Der Kühlmittelmantel 42 ist dabei über den Kühlmitteleinlaß 11 und den Kühlmittelauslaß 12 in der Regel mit dem Kühlmittelkreislauf des Verbrennungsmotors in bekannter Weise verbunden.By introducing this hot exhaust gas into the intake manifold, the engine becomes fast heated, so that also heats the coolant of the engine faster flows into the coolant jacket 42. Is a switching temperature of the coolant and thus reaches the bimetallic spring 41, the bypass flap 33 is actuated and the Opened between the chambers 57 and 58, so that no more exhaust gas can flow through the bypass channel 8. Instead, then the exhaust gas flows between the ribs 54 of the heat exchanger unit 15 and is in the rear Area 56 deflected by 180 degrees, so that the exhaust gas stream cooled in the second Chamber 58 passes, from where the exhaust gas in turn via the exhaust gas recirculation valve 19 can be performed to the intake manifold. The cooling of the exhaust gas takes place via a heat transfer between the flowing exhaust gas and the ribs 54 of the Heat exchanger unit 15, which by the surrounding coolant jacket 42 flowing coolant to be cooled. The coolant jacket 42 is over the Coolant inlet 11 and the coolant outlet 12 usually with the coolant circuit connected to the internal combustion engine in a known manner.

Somit wird ein Abgasrückführsystem geschaffen, welches einen geringen Bauraumbedarf aufweist und als komplette Baueinheit optimal aufeinander abgestimmt ist. Eine solche Baueinheit führt zu einer Gewichts- und Kostenreduzierung gegenüber bekannten Ausführungen, nicht zuletzt dadurch dass alle Gehäuseschalen in einfachem Druckgußverfahren herstellbar sind. Des weiteren wird ein sehr guter Wirkungsgrad der Kühleinrichtung erzielt und eine zusätzliche Kühlung des Ventilsitzes sichergestellt.Thus, an exhaust gas recirculation system is created, which requires a small space requirement has and as a complete unit is optimally matched. Such a unit leads to a weight and cost reduction known versions, not least in that all housing shells in simple Die casting can be produced. Furthermore, a very good efficiency achieved the cooling device and additional cooling of the valve seat ensured.

Es sollte klar sein, daß Modifikationen des erfindungsgemäßen Abgasrückführsystems möglich sind, wobei beispielsweise die Anordnung der Kühlmittelein- oder auslässe oder auch die Anordnung der Abgasein- oder auslässe anders gewählt werden kann. Denkbar ist so beispielsweise auch das Abgasrückführventil im Bereich des Abgaseinlasses anzuordnen. Auch die Lagerung beziehungsweise Aufnahme der Klappen beziehungsweise die Betätigungsart des Abgasrückführventils oder der Bypassklappe können auf andere Weise beispielsweise elektromagnetisch oder elektromotorisch erfolgen, ohne den Schutzbereich des Hauptanspruchs zu verlassen. Ebenso wird der Fachmann erkennen, daß es sich bei den Ausführungsbeispielen lediglich um günstige Aufteilungen und Formen handelt, so daß gegebenenfalls die Aufteilung der Gehäuseschalen 2, 3, 4, 5 auf andere Weise erfolgen kann.It should be clear that modifications of the exhaust gas recirculation system according to the invention are possible, for example, the arrangement of Kühlmittelein- or outlets or the arrangement of Abgasein- or outlets chosen differently can be. It is conceivable, for example, the exhaust gas recirculation valve in the area to arrange the exhaust inlet. Also the storage or recording the flaps or the actuation of the exhaust gas recirculation valve or the bypass door may otherwise be electromagnetic, for example or electric motor, without the scope of the main claim leave. Likewise, those skilled in the art will recognize that it is in the embodiments only deals with favorable divisions and forms, so that, if necessary the division of the housing shells 2, 3, 4, 5 done in other ways can.

Claims (12)

Abgasrückführsystem für eine Verbrennungskraftmaschine mit einem Abgaseinlaß und einem Abgasauslaß und einer Abgaskühlvorrichtung, die eine Wärmetauschereinheit aufweist, die von einem Kühlmittel durchströmt ist, sowie mit einem Bypasskanal, über den die Wärmetauschereinheit umgehbar ist und in dem eine Bypassklappe angeordnet ist, dadurch gekennzeichnet, daß das Abgasrückführsystem ein Gehäuse (2, 3, 4, 5) aufweist, in dem die Wärmetauschereinheit (15), die Bypassklappe (33) und ein Gehäuseteil (18, 22, 50) des Abgasrückführventils (19), in dem zumindest ein Ventilsitz (31) angeordnet ist, ausgebildet sind, wobei der Ventilsitz (31) durch das Kühlmittel gekühlt ist, und dass das Abgasrückführventil (19) die Abgaskühlvorrichtung (10) mit der Wärmetauschereinheit (15) und der Bypasskanal (8) mit der Bypassklappe (33) eine Baueinheit bilden.Exhaust gas recirculation system for an internal combustion engine with an exhaust inlet and an exhaust outlet and an exhaust gas cooling device having a heat exchanger unit, which is flowed through by a coolant, and with a bypass passage through which the heat exchanger unit is bypassable and in which a bypass flap is arranged, characterized in that the Exhaust gas recirculation system comprises a housing (2, 3, 4, 5), in which the heat exchanger unit (15), the bypass flap (33) and a housing part (18, 22, 50) of the exhaust gas recirculation valve (19), in which at least one valve seat (31 ), wherein the valve seat (31) is cooled by the coolant, and in that the exhaust gas recirculation valve (19) the exhaust gas cooling device (10) with the heat exchanger unit (15) and the bypass channel (8) with the bypass flap (33) Form building unit. Abgasrückführsystem für eine Verbrennungskraftmaschine nach Anspruch 1, dadurch gekennzeichnet, daß der Ventilsitz (31) des Abgasrückführventils (19) zwischen dem Bypasskanal (8) beziehungsweise der Wärmetauschereinheit (15) und dem Abgasauslaß (32) angeordnet ist.Exhaust gas recirculation system for an internal combustion engine according to claim 1, characterized in that the valve seat (31) of the exhaust gas recirculation valve (19) between the bypass passage (8) and the heat exchanger unit (15) and the exhaust gas outlet (32) is arranged. Abgasrückführsystem für eine Verbrennungskraftmaschine nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß das Gehäuse (1) des Abgasrückführsystems und die Wärmetauschereinheit (15) aus insgesamt vier Gehäuseschalen (2, 3, 4, 5), insbesondere Druckgussschalen, aufgebaut sind.Exhaust gas recirculation system for an internal combustion engine according to one of claims 1 or 2, characterized in that the housing (1) of the exhaust gas recirculation system and the heat exchanger unit (15) from a total of four housing shells (2, 3, 4, 5), in particular die-cast shells are constructed. Abgasrückführsystem für eine Verbrennungskraftmaschine nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die erste Gehäuseschale (2) den Abgaseinlaß (6), ein Unterteil (9) der Abgaskühlvorrichtung (10) sowie eine untere Außenwand (7) des Bypasskanals (8) bildet, die zweite Gehäuseschale (3) ein Oberteil (13) der Abgaskühlvorrichtung (10) mit einem Kühlmitteleinlass (11) und einem Kühlmittelauslass (12) und eine obere Außenwand (14) des Bypasskanals (8) bildet, die dritte Gehäuseschale (4) ein Unterteil (16) der Wärmetauschereinheit (15) und des Gehäuses (18) des Abgasrückführventils (19), den Abgasauslass (32) und eine untere Innenwand (17) des Bypasskanals (8) sowie einen unteren Teil (36) einer Zwischenwand, in der die Bypassklappe (33) angeordnet ist und die eine untere Lagerstelle (35) der Bypassklappe (33) aufweist, bildet und die vierte Gehäuseschale (5) ein Oberteil (20, 22) der Wärmetauschereinheit (15) und des Gehäuses des Abgasrückführventils (19), eine obere Innenwand (21) des Bypasskanals (8) sowie einen oberen Teil (37) einer Zwischenwand, in der die Bypassklappe (33) angeordnet ist und die eine obere Lagerstelle (34) der Bypassklappe (33) aufweist, bildet.Exhaust gas recirculation system for an internal combustion engine according to one of claims 1 or 2, characterized in that the first housing shell (2) the exhaust gas inlet (6), a lower part (9) of the exhaust gas cooling device (10) and a lower outer wall (7) of the bypass channel (8) the second housing shell (3) forms an upper part (13) of the exhaust gas cooling device (10) with a coolant inlet (11) and a coolant outlet (12) and an upper outer wall (14) of the bypass channel (8), the third housing shell (4) a lower part (16) of the heat exchanger unit (15) and the housing (18) of the exhaust gas recirculation valve (19), the exhaust outlet (32) and a lower inner wall (17) of the bypass channel (8) and a lower part (36) of an intermediate wall, in the bypass flap (33) is arranged and which has a lower bearing point (35) of the bypass flap (33), and the fourth housing shell (5) an upper part (20, 22) of the heat exchanger unit (15) and the housing of the exhaust gas recirculation valve ils (19), an upper inner wall (21) of the bypass duct (8) and an upper part (37) of an intermediate wall, in which the bypass flap (33) is arranged and which has an upper bearing point (34) of the bypass flap (33), forms. Abgasrückführsystem für eine Verbrennungskraftmaschine nach Anspruch 4, dadurch gekennzeichnet, daß das Abgasrückführventil (19) als Steckventil ausgeführt ist, welches in das Gehäuse (18, 22) eingesetzt ist und dessen Ventilsitz (31) zur Kühlung vom Kühlmittel umströmt ist.Exhaust gas recirculation system for an internal combustion engine according to claim 4, characterized in that the exhaust gas recirculation valve (19) is designed as a plug valve, which is inserted into the housing (18, 22) and the valve seat (31) is flowed around for cooling by the coolant. Abgasrückführsystem für eine Verbrennungskraftmaschine nach Anspruch 3, dadurch gekennzeichnet, daß die erste Gehäuseschale (2) den Abgaseinlaß (6), den Abgasauslaß (32), ein Unterteil (51) der Abgaskühlvorrichtung (10) und des Bypasskanals (8) sowie ein Gehäuse (50) des Abgasrückführventils (19) bildet, die zweite Gehäuseschale (3) ein Oberteil (52) der Abgaskühlvorrichtung (10) mit einem Kühlmitteleinlaß (11) und einem Kühlmittelauslaß (12) und des Bypasskanals (8) bildet, die dritte Gehäuseschale (4) ein Unterteil (16) der Wärmetauschereinheit (15), einen unteren Teil (36) einer Zwischenwand, in der die Bypassklappe (33) angeordnet ist, und die eine untere Lagerstelle (35) der Bypassklappe (33) aufweist, bildet und die vierte Gehäuseschale (5) ein Oberteil (20) der Wärmetauschereinheit (15) und einen oberen Teil (37) einer Zwischenwand, in der die Bypassklappe (33) angeordnet ist und die eine obere Lagerstelle (34) der Bypassklappe (33) aufweist, bildet.Exhaust gas recirculation system for an internal combustion engine according to claim 3, characterized in that the first housing shell (2) the exhaust gas inlet (6), the exhaust gas outlet (32), a lower part (51) of the exhaust gas cooling device (10) and the bypass channel (8) and a housing ( 50) of the exhaust gas recirculation valve (19), the second housing shell (3) forms an upper part (52) of the exhaust gas cooling device (10) with a coolant inlet (11) and a coolant outlet (12) and the bypass channel (8), the third housing shell (4 ) a lower part (16) of the heat exchanger unit (15), a lower part (36) of an intermediate wall, in which the bypass flap (33) is arranged, and which has a lower bearing point (35) of the bypass flap (33) forms, and the fourth Housing shell (5) an upper part (20) of the heat exchanger unit (15) and an upper part (37) of an intermediate wall, in which the bypass flap (33) is arranged and which has an upper bearing point (34) of the bypass flap (33) forms. Abgasrückführsystem für eine Verbrennungskraftmaschine nach Anspruch 6, dadurch gekennzeichnet, daß das Abgasrückführventil (19) als Steckventil ausgeführt ist, welches in das Gehäuse (50) eingesetzt ist und dessen Ventilsitz (31) zur Kühlung unmittelbar neben einem zwischen der ersten und dritten sowie zwischen der zweiten und vierten Gehäuseschale (2, 4; 3, 5) ausgebildeten Kühlmittelmantel (42) angeordnet ist.Exhaust gas recirculation system for an internal combustion engine according to claim 6, characterized in that the exhaust gas recirculation valve (19) is designed as a plug valve, which is inserted into the housing (50) and its valve seat (31) for cooling immediately adjacent to one between the first and third and between the second and fourth housing shell (2, 4, 3, 5) formed coolant jacket (42) is arranged. Abgasrückführsystem für eine Verbrennungskraftmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Bypassklappe (33) zumindest indirekt über eine temperaturempfindliche Bimetallfeder (41) gesteuert ist.Exhaust gas recirculation system for an internal combustion engine according to one of the preceding claims, characterized in that the bypass flap (33) is controlled at least indirectly via a temperature-sensitive bimetallic spring (41). Abgasrückführsystem für eine Verbrennungskraftmaschine nach Anspruch 8, dadurch gekennzeichnet, daß die Bimetallfeder (41) von Kühlmittel umströmt ist.Exhaust gas recirculation system for an internal combustion engine according to claim 8, characterized in that the bimetallic spring (41) flows around coolant. Abgasrückführsystem für eine Verbrennungskraftmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Gehäuseschalen (2, 3, 4, 5) jeweils an ihren Auflageflächen zur anderen Gehäuseschale (2, 3, 4, 5) Nuten (44) aufweisen, in die korrespondierende Stege (45) der jeweils anderen Gehäuseschale (2, 3, 4, 5) eingreifen und die Verbindung über eine Klebeverbindung hergestellt ist.Exhaust gas recirculation system for an internal combustion engine according to one of the preceding claims, characterized in that the housing shells (2, 3, 4, 5) in each case at their bearing surfaces to the other housing shell (2, 3, 4, 5) grooves (44), in the corresponding Webs (45) of the other housing shell (2, 3, 4, 5) engage and the connection is made via an adhesive bond. Abgasrückführsystem für eine Verbrennungskraftmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Kühlmittelmantel (42) im Bereich der Kühleinrichtung (10) im Querschnitt den gesamten Umfang der Wärmetauschereinheit (15) umgibt.Exhaust gas recirculation system for an internal combustion engine according to one of the preceding claims, characterized in that the coolant jacket (42) in the region of the cooling device (10) surrounds in cross section the entire circumference of the heat exchanger unit (15). Abgasrückführsystem für eine Verbrennungskraftmaschine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Stege (45) und die Nuten (44), über welche die Gehäuseschalen (4, 5) verbunden sind im Bereich des Kühlmittelmantels (42) angeordnet sind, wobei zwischen dem abgasdurchströmten Bereich der Wärmetauschereinheit (15) und den Stegen (45) und Nuten (44) an beiden Gehäuseschalen (4, 5) Nuten ausgebildet sind, welche einen Luftraum bilden.Exhaust gas recirculation system for an internal combustion engine according to any one of the preceding claims, characterized in that the webs (45) and the grooves (44), via which the housing shells (4, 5) are connected in the region of the coolant jacket (42) are arranged, between the Abgasdurchströmten area of the heat exchanger unit (15) and the webs (45) and grooves (44) on both housing shells (4, 5) grooves are formed, which form an air space.
EP05001654A 2004-04-22 2005-01-27 Exhaust recirculation system Active EP1589214B1 (en)

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EP2310658A4 (en) * 2009-08-25 2015-11-18 Unick Corp Bypass valve having egr valve
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ATE515634T1 (en) 2011-07-15
EP1589214B1 (en) 2011-07-06
US7077114B2 (en) 2006-07-18
DE102004019554C5 (en) 2014-03-27
DE102004019554B4 (en) 2007-08-30
US20050235973A1 (en) 2005-10-27
DE102004019554A1 (en) 2005-11-17
EP1589214A3 (en) 2010-09-29

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