EP0916837B1 - Exhaust gas recirculating device for a combustion engine - Google Patents

Exhaust gas recirculating device for a combustion engine Download PDF

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Publication number
EP0916837B1
EP0916837B1 EP98119748A EP98119748A EP0916837B1 EP 0916837 B1 EP0916837 B1 EP 0916837B1 EP 98119748 A EP98119748 A EP 98119748A EP 98119748 A EP98119748 A EP 98119748A EP 0916837 B1 EP0916837 B1 EP 0916837B1
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EP
European Patent Office
Prior art keywords
exhaust gas
valve
gas recirculation
recirculation cooler
accordance
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.)
Expired - Lifetime
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EP98119748A
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German (de)
French (fr)
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EP0916837B2 (en
EP0916837A3 (en
EP0916837A2 (en
Inventor
Matthias Dipl.-Ing. Banzhaf
Martin Dipl.-Ing. Bauer (FH)
Osman Sari
Gérard Dietz
Helmut Blank
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Pierburg GmbH
Mahle Behr GmbH and Co KG
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Pierburg GmbH
Behr GmbH and Co KG
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Application filed by Pierburg GmbH, Behr GmbH and Co KG filed Critical Pierburg GmbH
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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
    • F02M26/12—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
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids

Definitions

  • the invention relates to a device for exhaust gas recirculation for an internal combustion engine with an exhaust gas cooler that has a flow path for a liquid coolant and a Has flow path for exhaust gas and with a determining the recirculated exhaust gas amount by means of an adjusting element adjustable valve, the exhaust gas cooler and the Connect the valve directly to one another and form a structural unit.
  • the return of cooled exhaust gas to an internal combustion engine is particularly useful for Lowering diesel emissions known, ATZ Automobiltechnische Zeitschrift 99 (1997) 9 (R. Lutz: Reduction of diesel emissions by returning cooled exhaust gas).
  • the Exhaust gas recirculation valve (EGR valve) and the exhaust gas cooler (exhaust gas heat exchanger) are common components that are independent of one another, located at different points in the vehicle installed and connected to each other by means of an exhaust pipe.
  • the invention has for its object a device of the type mentioned to be designed so that the actuating element is subjected to as little thermal stress as possible.
  • control element on a component of the exhaust gas cooler is attached, which is cooled by the coolant flowing through the exhaust gas cooler.
  • control element is attached to a component, that with one or more channels for a liquid coolant is provided.
  • Both configurations enable the valve on the exhaust gas inflow side to arrange the exhaust gas cooler.
  • the arrangement of the Valve on the inflow side of the exhaust gas cooler, i.e. on the Side on which the hot exhaust gas flows in has the advantage that the risk is relatively low that residues of the exhaust gas attach to the valve and its valve elements.
  • This Danger when arranging the valve after the exhaust gas cooler Increased exists leads to control elements must be provided with relatively large actuating forces that an adhesion of the valve elements due to deposited Exhaust residues can safely overcome.
  • When arranging on the exhaust gas inflow side there is a risk of deposits of Exhaust gas residues significantly lower.
  • the risk that the control elements, in particular electrical control elements, thermally overloaded are. This thermal overload is counteracted that the control element is attached to a component, whose temperature is significantly lower than the temperature of the exhaust gas coming from the internal combustion engine.
  • the channel or channels of the component carrying the actuating element connect to a coolant inlet to the exhaust gas cooler.
  • none outer connecting lines between the cooling Channels of the component carrying the actuator and to the Exhaust cooler must be provided.
  • the exhaust gas cooler has an elongated shape, and that the control element essentially in parallel next to the exhaust gas cooler is arranged. This results in a compact Design that is relatively easy to accommodate in a vehicle is.
  • the assembly shown in FIGS. 1 and 2 contains an exhaust gas cooler 10 and a valve 11, a so-called EGR valve.
  • the valve 11 and the exhaust gas cooler 10 are preferably arranged so as it is in Figure 2 of the literature mentioned at the beginning is shown, i.e. the valve 11 is on the exhaust gas inlet side of the exhaust gas cooler 10.
  • the valve 11 is provided with a connecting flange 12, with which it comes to an exhaust pipe coming from an internal combustion engine can be connected.
  • Inside the valve body is an adjustable valve element in a manner not shown provided to which a valve seat is assigned.
  • the Valve determines the amount of exhaust gas that is sent to the exhaust gas cooler 10 flows.
  • the valve element is by means of an actuator 13 adjusted, in particular an electromagnetic actuator. This determines depending on the specified engine data Valve 11 the amount of exhaust gas that is supplied to the internal combustion engine Fresh air can be added.
  • the actuator 13 can work so that there is a two-point control or also carries out a cross-sectional regulation.
  • the valve 11 is with Provided fasteners 14, by means of which it is attached to a Bracket can be attached, for example on the engine block of the internal combustion engine.
  • the valve 11 has one in approximately funnel-shaped distribution chamber 15, by means of the exhaust gas is supplied to the exhaust gas cooler 10.
  • the exhaust gas cooler 10 is designed in principle as this the reference mentioned at the beginning (ATZ Automobiltechnische Journal 99 (1997) 9) is known. He owns his Each end has a floor in which the ends of one Variety of rectangular tubes are used, which are among themselves are arranged at a distance.
  • the tube bundle out Rectangular tubes are surrounded by a jacket 16 which is attached to the circumferential chambers 17, 18 forms both end regions.
  • the Chambers 17, 18 are provided with connections 19, 20 through the coolant of the engine cooling circuit is supplied and removed becomes.
  • the coolant preferably flows parallel to the exhaust gas in the exhaust gas cooler 10, so that the connection 19 is an inlet connection and port 20 is a return port.
  • the end of the exhaust gas cooler 10 facing the valve 11 is with provided a flange 23, which preferably also the bottom for forms the tube bundle of the exhaust gas cooler.
  • the housing of the valve 11 is flanged.
  • the control element 13 is fastened next to the exhaust gas cooler 10, that is essentially parallel to the jacket 16 of the exhaust gas cooler is aligned.
  • the flange 23 is relatively thick-walled trained so that he has a thermal separation between the housing of the valve 11 and the actuator 13 forms.
  • the flange 23, which of the through the exhaust gas cooler 10th flowing coolant is clearly cooled lower temperature than the valve housing of the valve 11, so that the actuator 13 is thermally separated from the valve 11 and is accordingly only relatively slightly thermally stressed.
  • an exhaust gas cooler 10 and a valve 11 formed unit of the embodiment of FIGS. 3 and 4 corresponds in the basic structure and in the basic Arrangement of the embodiment according to FIGS. 1 and 2.
  • the exhaust gas cooler 10 has a stronger flange 24 provided the in a manner not shown with by one Feed port 25 leading to the chamber 17 of the jacket 16 Channels is provided, through which the coolant of the internal combustion engine to the chamber 17 of the exhaust gas cooler 10 is performed.
  • the flange 24 is therefore actively cooled, so that an even better thermal separation between the valve 11 and the actuator 13 is obtained.

Description

Die Erfindung betrifft eine Vorrichtung zur Abgasrückführung für einen Verbrennungsmotor mit einem Abgaskühler, der einen Strömungsweg für ein flüssiges Kühlmittel und einen Strömungsweg für Abgas aufweist und mit einem die rückgeführte Abgasmenge bestimmenden, mittels eines Stellelementes verstellbaren Ventil, wobei der Abgaskühler und das Ventil unmittelbar aneinander anschließen und eine Baueinheit bilden.The invention relates to a device for exhaust gas recirculation for an internal combustion engine with an exhaust gas cooler that has a flow path for a liquid coolant and a Has flow path for exhaust gas and with a determining the recirculated exhaust gas amount by means of an adjusting element adjustable valve, the exhaust gas cooler and the Connect the valve directly to one another and form a structural unit.

Das Rückführen von gekühltem Abgas zu einem Verbrennungsmotor ist insbesondere zum Senken von Diesel-Emissionen bekannt, ATZ Automobiltechnische Zeitschrift 99 (1997) 9 (R. Lutz: Senkung von Diesel-Emissionen durch Rückführung von gekühltem Abgas). Das Abgasrückführventil (AGR-Ventil) und der Abgaskühler (Abgaswärmeübertrager) sind üblicherweise voneinander unabhängige Bauteile, die an unterschiedlichen Stellen im Fahrzeug eingebaut und mittels einer Abgasleitung miteinander verbunden sind.The return of cooled exhaust gas to an internal combustion engine is particularly useful for Lowering diesel emissions known, ATZ Automobiltechnische Zeitschrift 99 (1997) 9 (R. Lutz: Reduction of diesel emissions by returning cooled exhaust gas). The Exhaust gas recirculation valve (EGR valve) and the exhaust gas cooler (exhaust gas heat exchanger) are common components that are independent of one another, located at different points in the vehicle installed and connected to each other by means of an exhaust pipe.

Es ist jedoch auch bereits bekannt (US-A-4 134 377) das mittels eines Stellelementes verstellbare Ventil und den Abgaskühler unmittelbar aneinander anzuschließen und zu einer Baueinheit auszubilden. Bei der bekannten Bauart ist dabei ein Ventilkörper vorgesehen, der eine Verteilkammer für zuströmendes Abgas bildet, die einem Abgaskühler vorgeordnet ist. Nach dem Abgaskühler bildet der Ventilkörper eine zweite Kammer, in die das gekühlte Abgas hineinströmt. An einer Wandung des Ventilkörpers, der diese Sammelkammer begrenzt, ist ein Stellelement für das Ventil angeordnet.However, it is also already known (US-A-4 134 377) that is adjustable by means of an adjusting element Connect valve and exhaust gas cooler directly to each other and to one Training unit. In the known design, a valve body is provided, which forms a distribution chamber for incoming exhaust gas, which is arranged upstream of an exhaust gas cooler is. After the exhaust gas cooler, the valve body forms a second chamber in which the cooled one Exhaust gas flows in. On a wall of the valve body that this collection chamber limited, an actuator for the valve is arranged.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art so auszubilden, dass das Stellelement möglichst wenig thermisch belastet ist. The invention has for its object a device of the type mentioned to be designed so that the actuating element is subjected to as little thermal stress as possible.

Diese Aufgabe wird dadurch gelöst, dass das Stellelement an einem Bauteil des Abgaskühlers angebracht ist, das von durch den Abgaskühler strömendem Kühlmittel mitgekühlt ist. This object is achieved in that the control element on a component of the exhaust gas cooler is attached, which is cooled by the coolant flowing through the exhaust gas cooler.

Bei einer anderen Ausgestaltung der Erfindung wird vorgesehen, daß das Stellelement an einem Bauteil angebracht ist, das mit einem oder mehreren Kanälen für ein flüssiges Kühlmittel versehen ist. Damit wird der Vorteil erhalten, daß das Ventil und insbesondere dessen Stellelement aktiv gekühlt wird.In another embodiment of the invention, that the control element is attached to a component, that with one or more channels for a liquid coolant is provided. This gives the advantage that Valve and in particular its control element actively cooled becomes.

Beide Ausgestaltungen ermöglichen das Ventil auf der Abgaszuströmseite des Abgaskühlers anzuordnen. Die Anordnung des Ventils auf der Zuströmseite des Abgaskühlers, d.h. auf der Seite, auf der das heiße Abgas zuströmt, hat den Vorteil, daß die Gefahr relativ gering ist, daß sich Rückstände des Abgases an dem Ventil und seinen Ventilelementen festsetzen. Diese Gefahr, die bei einer Anordnung des Ventils nach dem Abgaskühler verstärkt besteht, führt dazu, daß Stellelemente mit relativ großen Stellkräften vorgesehen werden müssen, die eine Verklebung der Ventilelemente aufgrund von abgelagerten Abgasrückständen sicher überwinden können. Bei der Anordnung auf der Abgaszuströmseite ist die Gefahr von Ablagerungen von Abgasrückständen wesentlich geringer. Dagegen besteht jedoch bei dieser Anordnung die Gefahr, daß die Stellelemente, insbesondere elektrische Stellelemente, thermisch überlastet sind. Dieser thermischen Überlastung wird dadurch entgegengewirkt, daß das Stellelement an einem Bauteil angebracht wird, dessen Temperatur deutlich geringer ist als die Temperatur des vom Verbrennungsmotor kommenden Abgases.Both configurations enable the valve on the exhaust gas inflow side to arrange the exhaust gas cooler. The arrangement of the Valve on the inflow side of the exhaust gas cooler, i.e. on the Side on which the hot exhaust gas flows in has the advantage that the risk is relatively low that residues of the exhaust gas attach to the valve and its valve elements. This Danger when arranging the valve after the exhaust gas cooler Increased exists, leads to control elements must be provided with relatively large actuating forces that an adhesion of the valve elements due to deposited Exhaust residues can safely overcome. When arranging on the exhaust gas inflow side there is a risk of deposits of Exhaust gas residues significantly lower. However, there is with this arrangement, the risk that the control elements, in particular electrical control elements, thermally overloaded are. This thermal overload is counteracted that the control element is attached to a component, whose temperature is significantly lower than the temperature of the exhaust gas coming from the internal combustion engine.

In weiterer Ausgestaltung der Erfindung wird vorgesehen, daß der oder die Kanäle des das Stellelement tragenden Bauteils an einen Kühlmittelzulauf zu dem Abgaskühler anschließen. Damit läßt sich eine weitere Vereinfachung erzielen, da keine äußeren Verbindungsleitungen zwischen den zum Kühlen dienenden Kanäle des das Stellelement tragenden Bauteils und zu dem Abgaskühler vorgesehen werden müssen.In a further embodiment of the invention it is provided that the channel or channels of the component carrying the actuating element connect to a coolant inlet to the exhaust gas cooler. In order to can be further simplified since none outer connecting lines between the cooling Channels of the component carrying the actuator and to the Exhaust cooler must be provided.

In weiterer Ausgestaltung der Erfindung wird vorgesehen, daß der Abgaskühler eine langgestreckte Gestalt aufweist, und daß das Stellelement im wesentlichen parallel neben dem Abgaskühler angeordnet ist. Dadurch ergibt sich eine kompakte Bauform, die in einem Fahrzeug relativ einfach unterzubringen ist.In a further embodiment of the invention it is provided that the exhaust gas cooler has an elongated shape, and that the control element essentially in parallel next to the exhaust gas cooler is arranged. This results in a compact Design that is relatively easy to accommodate in a vehicle is.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung der in der Zeichnung dargestellten Ausführungsbeispiele.

Fig. 1
zeigt eine perspektivische Ansicht einer Baueinheit aus einem Abgaskühler und einem die Durchflußmenge des Abgases bestimmenden Ventil,
Fig. 2
eine Ansicht in Richtung des Pfeiles II der Fig. 1,
Fig. 3
eine perspektivische Ansicht einer Baueinheit aus Abgaskühler und Ventil mit einer aktiven Kühlung für ein zum Ventil gehörendes Stellelement und
Fig. 4
eine Ansicht in Richtung des Pfeiles IV der Fig. 3.
Further features and advantages of the invention result from the following description of the exemplary embodiments shown in the drawing.
Fig. 1
1 shows a perspective view of a structural unit comprising an exhaust gas cooler and a valve which determines the flow rate of the exhaust gas,
Fig. 2
2 shows a view in the direction of arrow II in FIG. 1,
Fig. 3
a perspective view of an assembly of exhaust gas cooler and valve with active cooling for an actuator belonging to the valve and
Fig. 4
a view in the direction of arrow IV of FIG. 3rd

Die in Fig. 1 und 2 dargestellte Baueinheit enthält einen Abgaskühler 10 und ein Ventil 11, ein sogenanntes AGR-Ventil. Das Ventil 11 und der Abgaskühler 10 werden bevorzugt so angeordnet, wie es in Bild 2 der eingangs genannten Literaturstelle dargestellt ist, d.h. das Ventil 11 befindet sich auf der Abgaszulaufseite des Abgaskühlers 10.The assembly shown in FIGS. 1 and 2 contains an exhaust gas cooler 10 and a valve 11, a so-called EGR valve. The valve 11 and the exhaust gas cooler 10 are preferably arranged so as it is in Figure 2 of the literature mentioned at the beginning is shown, i.e. the valve 11 is on the exhaust gas inlet side of the exhaust gas cooler 10.

Das Ventil 11 ist mit einem Anschlußflansch 12 versehen, mit welchem es an eine von einem Verbrennungsmotor kommende Abgasleitung anschließbar ist. Im Innern des Ventilgehäuses ist in nicht näher dargestellter Weise ein verstellbares Ventilelement vorgesehen, dem ein Ventilsitz zugeordnet ist. Das Ventil bestimmt die Abgasmenge, die zu dem Abgaskühler 10 strömt. Das Ventilelement wird mittels eines Stellelementes 13 verstellt, insbesondere einem elektromagnetischen Stellelement. Abhängig von vorgegebenen Motordaten bestimmt das Ventil 11 die Abgasmengen, die der im Verbrennungsmotor zugeführten Frischluft zugemischt werden. Das Stellelement 13 kann so arbeiten, daß es eine Zweipunkt-Regelung oder auch eine Querschnitts-Regelung durchführt. Das Ventil 11 ist mit Befestigungsmitteln 14 versehen, mittels derer es an einer Halterung befestigbar ist, beispielsweise an dem Motorblock des Verbrennungsmotors. Das Ventil 11 besitzt eine sich in etwa trichterförmig aufweitende Verteilkammer 15, mittels der das Abgas dem Abgaskühler 10 zugeführt wird.The valve 11 is provided with a connecting flange 12, with which it comes to an exhaust pipe coming from an internal combustion engine can be connected. Inside the valve body is an adjustable valve element in a manner not shown provided to which a valve seat is assigned. The Valve determines the amount of exhaust gas that is sent to the exhaust gas cooler 10 flows. The valve element is by means of an actuator 13 adjusted, in particular an electromagnetic actuator. This determines depending on the specified engine data Valve 11 the amount of exhaust gas that is supplied to the internal combustion engine Fresh air can be added. The actuator 13 can work so that there is a two-point control or also carries out a cross-sectional regulation. The valve 11 is with Provided fasteners 14, by means of which it is attached to a Bracket can be attached, for example on the engine block of the internal combustion engine. The valve 11 has one in approximately funnel-shaped distribution chamber 15, by means of the exhaust gas is supplied to the exhaust gas cooler 10.

Der Abgaskühler 10 ist im Prinzip so gestaltet, wie dies aus der eingangs erwähnten Literaturstelle (ATZ Automobiltechnische Zeitschrift 99 (1997) 9) bekannt ist. Er besitzt an seinen Stirnenden jeweils einen Boden, in welchen die Enden einer Vielzahl von Rechteckrohren eingesetzt sind, die untereinander in Abstand angeordnet sind. Das Rohrbündel aus Rechteckrohren ist mit einem Mantel 16 umgeben, der an den beiden Endbereichen umlaufende Kammern 17, 18 bildet. Die Kammern 17, 18 sind mit Anschlüssen 19, 20 versehen, durch die Kühlmittel des Motorkühlkreislaufes zu- und abgeführt wird. Bevorzugt strömt das Kühlmittel parallel zu dem Abgas in dem Abgaskühler 10, so daß der Anschluß 19 ein Zulaufanschluß und der Anschluß 20 ein Rücklaufanschluß ist. The exhaust gas cooler 10 is designed in principle as this the reference mentioned at the beginning (ATZ Automobiltechnische Journal 99 (1997) 9) is known. He owns his Each end has a floor in which the ends of one Variety of rectangular tubes are used, which are among themselves are arranged at a distance. The tube bundle out Rectangular tubes are surrounded by a jacket 16 which is attached to the circumferential chambers 17, 18 forms both end regions. The Chambers 17, 18 are provided with connections 19, 20 through the coolant of the engine cooling circuit is supplied and removed becomes. The coolant preferably flows parallel to the exhaust gas in the exhaust gas cooler 10, so that the connection 19 is an inlet connection and port 20 is a return port.

An den die Kammer 18 abschließenden Boden, der die Enden des Rohrbündels aufnimmt, schließt eine sich in etwa trichterförmig verjüngende Sammelkammer 21 an, die in einen Flansch 22 übergeht, der mit einer weiterführenden Abgasleitung verbunden wird.At the bottom of the chamber 18, the ends of the Pipe bundle picks up, closes approximately funnel-shaped tapered collecting chamber 21, which in a flange 22nd passes, which is connected to a continuing exhaust pipe becomes.

Das dem Ventil 11 zugewandte Ende des Abgaskühlers 10 ist mit einem Flansch 23 versehen, der bevorzugt auch den Boden für das Rohrbündel des Abgaskühlers bildet. An diesen Flansch 23 ist das Gehäuse des Ventils 11 angeflanscht. An dem Flansch 23 ist neben dem Abgaskühler 10 das Stellelement 13 befestigt, das im wesentlichen parallel zu dem Mantel 16 des Abgaskühlers ausgerichtet ist. Der Flansch 23 ist relativ dickwandig ausgebildet, so daß er eine thermische Trennung zwischen dem Gehäuse des Ventils 11 und dem Stellelement 13 bildet. Der Flansch 23, der von dem durch den Abgaskühler 10 strömenden Kühlmittel mitgekühlt wird, besitzt eine deutlich geringere Temperatur als das Ventilgehäuse des Ventils 11, so daß das Stellelement 13 thermisch von dem Ventil 11 getrennt und entsprechend nur relativ gering thermisch belastet ist.The end of the exhaust gas cooler 10 facing the valve 11 is with provided a flange 23, which preferably also the bottom for forms the tube bundle of the exhaust gas cooler. At this flange 23 the housing of the valve 11 is flanged. On the flange 23, the control element 13 is fastened next to the exhaust gas cooler 10, that is essentially parallel to the jacket 16 of the exhaust gas cooler is aligned. The flange 23 is relatively thick-walled trained so that he has a thermal separation between the housing of the valve 11 and the actuator 13 forms. The flange 23, which of the through the exhaust gas cooler 10th flowing coolant is clearly cooled lower temperature than the valve housing of the valve 11, so that the actuator 13 is thermally separated from the valve 11 and is accordingly only relatively slightly thermally stressed.

Die ebenfalls aus einem Abgaskühler 10 und einem Ventil 11 gebildete Baueinheit des Ausführungsbeispiels nach Fig. 3 und 4 entspricht in dem prinzipiellen Aufbau und in der prinzipiellen Anordnung dem Ausführungsbeispiel nach Fig. 1 und 2. Der Abgaskühler 10 ist jedoch mit einem stärkeren Flansch 24 versehen, der in nicht näher dargestellter Weise mit von einem Zuführanschluß 25 zu der Kammer 17 des Mantels 16 führenden Kanälen versehen ist, durch welche hindurch das Kühlmittel des Verbrennungsmotors zu der Kammer 17 des Abgaskühlers 10 geführt wird. Der Flansch 24 ist daher aktiv gekühlt, so daß eine noch bessere thermische Trennung zwischen dem Ventil 11 und dem Stellelement 13 erhalten wird.The also from an exhaust gas cooler 10 and a valve 11 formed unit of the embodiment of FIGS. 3 and 4 corresponds in the basic structure and in the basic Arrangement of the embodiment according to FIGS. 1 and 2. However, the exhaust gas cooler 10 has a stronger flange 24 provided the in a manner not shown with by one Feed port 25 leading to the chamber 17 of the jacket 16 Channels is provided, through which the coolant of the internal combustion engine to the chamber 17 of the exhaust gas cooler 10 is performed. The flange 24 is therefore actively cooled, so that an even better thermal separation between the valve 11 and the actuator 13 is obtained.

Bei den Ausführungsbeispielen nach Fig. 1, 2 und 3, 4 ist jeweils ein elektromagnetisches Stellelement 13 vorgesehen, das mit einem Anschlußstecker 26 für die Stromversorgung versehen ist. Bei abgewandelten Ausführungsformen werden andere Stellelemente vorgesehen, beispielsweise pneumatische Stellelemente, die die gleiche Funktion erfüllen. Auch diese Stellelemente sind dann thermisch weitgehend von dem Ventil getrennt, so daß sie nur einer relativ geringen Temperaturbelastung ausgesetzt sind.1, 2 and 3, 4 is in each case an electromagnetic actuator 13 is provided provided with a connector 26 for the power supply is. In modified embodiments, other control elements provided, for example pneumatic control elements, that perform the same function. These control elements too are then largely thermally separated from the valve, so that they have a relatively low temperature load are exposed.

Claims (7)

  1. A device for exhaust gas recirculation for an internal combustion engine with an exhaust gas recirculation cooler (10) which has one flow path for liquid coolant and one flow path for exhaust gases and with a valve (11) which determines the volume of exhaust gas recirculated and which can be adjusted by means of a regulating element (13), the exhaust gas recirculation cooler (10) and the valve (11) being connected directly together and forming one module,
    characterised in that
    the regulating element (13) is mounted on a component (23, 24) of the exhaust gas recirculation cooler (10) which is also cooled by the coolant flowing through the exhaust gas recirculation cooler (10).
  2. A device in accordance with claim 1,
    characterised in that
    the regulating element (13) is mounted on a component (24) which is provided with one or more channels for a liquid coolant.
  3. A device in accordance with claim 1 or 2,
    characterised in that
    the valve (11) is positioned on the exhaust gas supply side of the exhaust gas recirculation cooler (10).
  4. A device in accordance with claim 2 or claim 3 where the latter is dependent upon 2,
    characterised in that
    the channel(s) of the component (24) bearing the regulating element (13) connect/s to a coolant supply (17) to the exhaust gas recirculation cooler (10).
  5. A device in accordance with one or more of claims 1 to 4,
    characterised in that
    the exhaust gas recirculation cooler (10) has an elongated form and that the regulating element (13) is positioned essentially parallel next to the exhaust gas recirculation cooler (10).
  6. A device in accordance with one or more of claims 1 to 5,
    characterised in that
    the exhaust gas recirculation cooler (10) and the valve (11) are flanged together and that the regulating element (13) is mounted on a flange (23, 24) on the exhaust gas recirculation cooler (10).
  7. A device in accordance with one or more of claims 1 to 6,
    characterised in that
    the valve housing of the valve (11) is provided with fixing devices (14) to fix the component to a support.
EP98119748A 1997-11-17 1998-10-22 Exhaust gas recirculating device for a combustion engine Expired - Lifetime EP0916837B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19750588.0A DE19750588B4 (en) 1997-11-17 1997-11-17 Device for exhaust gas recirculation for an internal combustion engine
DE19750588 1997-11-17

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EP0916837A2 EP0916837A2 (en) 1999-05-19
EP0916837A3 EP0916837A3 (en) 2000-03-08
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Also Published As

Publication number Publication date
US6213105B1 (en) 2001-04-10
EP0916837B2 (en) 2011-10-26
DE19750588A1 (en) 1999-05-20
DE19750588B4 (en) 2016-10-13
EP0916837A3 (en) 2000-03-08
EP0916837A2 (en) 1999-05-19
DE59803324D1 (en) 2002-04-18

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