EP2025910B1 - Exhaust gas recirculation system - Google Patents

Exhaust gas recirculation system Download PDF

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Publication number
EP2025910B1
EP2025910B1 EP07014901A EP07014901A EP2025910B1 EP 2025910 B1 EP2025910 B1 EP 2025910B1 EP 07014901 A EP07014901 A EP 07014901A EP 07014901 A EP07014901 A EP 07014901A EP 2025910 B1 EP2025910 B1 EP 2025910B1
Authority
EP
European Patent Office
Prior art keywords
valve
exhaust gas
gas recirculation
actuator
recirculation system
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.)
Revoked
Application number
EP07014901A
Other languages
German (de)
French (fr)
Other versions
EP2025910A1 (en
Inventor
Bernhard Klipfel
Christoph Thiery
Jan Helber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cooper Standard Automotive Deutschland GmbH
Original Assignee
Cooper Standard Automotive Deutschland GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=38812334&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2025910(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Cooper Standard Automotive Deutschland GmbH filed Critical Cooper Standard Automotive Deutschland GmbH
Priority to AT07014901T priority Critical patent/ATE450706T1/en
Priority to PT07014901T priority patent/PT2025910E/en
Priority to DE502007002202T priority patent/DE502007002202D1/en
Priority to EP07014901A priority patent/EP2025910B1/en
Priority to ES07014901T priority patent/ES2337192T3/en
Priority to KR1020080074053A priority patent/KR101501772B1/en
Priority to US12/182,029 priority patent/US8353274B2/en
Priority to CNA2008101294435A priority patent/CN101358566A/en
Publication of EP2025910A1 publication Critical patent/EP2025910A1/en
Publication of EP2025910B1 publication Critical patent/EP2025910B1/en
Application granted granted Critical
Priority to KR1020140097494A priority patent/KR20140103243A/en
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F02M26/58—Constructional details of the actuator; Mounting thereof
    • 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
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
    • 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

Definitions

  • the invention relates to an exhaust gas recirculation system.
  • the exhaust gas can also be passed, at least partially, through an exhaust gas cooler, also depending on the operating state, in order to set the temperature of the recirculated exhaust gas in a targeted manner.
  • a device for exhaust gas recirculation in which an actuator for a valve which determines the amount of recirculated exhaust gas is attached to a flange of the exhaust gas cooler.
  • the JP 9-88727 relates to an exhaust gas cooler, inside which a translationally movable valve is provided, the adjusting element is mounted on a jacket of the exhaust gas cooler.
  • the EP 1 251 263 A2 discloses an exhaust gas recirculation system according to the preamble of claim 1.
  • the invention has for its object to provide an exhaust gas recirculation system, which allows a particularly reliable operation under all operating conditions.
  • this has at least one cooler with a housing and at least one pivotally or rotatably operable valve on an inflow side.
  • the housing of the radiator is used, for example, to receive those lines through which the exhaust gas to be recirculated, and optionally a suitably insulated bypass line.
  • a coolant such as water
  • the bypass tube is provided either outside the radiator housing, or within the same and suitably isolated, so that there is a much less extensive cooling of the recirculated exhaust gas.
  • the radiator of the exhaust gas recirculation system described herein may be configured as shown in FIG EP 1 277 945 A1 the applicant is described.
  • valve on the inflow side has the advantage that here the exhaust gas is relatively hot, so that there is a significantly reduced risk of deposits and contamination, which could lead to sticking of the valve on his valve seat. Nevertheless, if such problems occur, which can lead to a certain adhesion of the valve to its valve seat, the inventive design of the valve as a pivotally actuated valve offers advantages. This is understood to mean that not only the actuator for the valve is designed to pivot, but also that the valve or the valve element itself between the closed and the open position, and vice versa, moves pivoting. This can, as described in more detail below, with simple means safe operation, especially with regard to reliable opening guaranteed.
  • a pivotally actuated valve element can be arranged in a favorable manner and comparatively simple means so that it influences the flow of the exhaust gas as little as possible even in the open state and thus the flow resistance at the valve is minimized.
  • the invention provides that the actuator for the valve is provided on the radiator housing. This can be done in an advantageous manner, a cooling of the actuator. In particular, excessive heating of the actuator is avoided, so that a high degree of operational reliability is achieved.
  • the radiator housing may, for example, receive the (usually liquid) coolant used to cool the exhaust gas flowing through the respective ducts. As a result, the cooler housing itself is cooled, so that advantageously results in the corresponding cooling effect for the actuator.
  • the actuator may also be referred to as an actuating element and may be embodied, for example, as an electric motor, in particular a DC motor.
  • the arrangement of the axis of rotation always presents a special challenge.
  • leakage problems frequently occur when the axis of rotation extends "through" the valve element and insofar the edge of the valve element is interrupted.
  • the valve element is at least simply provided eccentrically with respect to its axis of rotation.
  • the axis of rotation of the valve element when viewed in the closed state, be offset in the flow direction or opposite thereto, so that the edge of the valve element does not need to be interrupted and a reliable closing can be ensured.
  • the axis of rotation with respect to the valve element again considered in the closed state, offset in a direction perpendicular to the flow direction, i. eccentric, be provided.
  • valve member As already indicated, for reasons of reliable closure, it is preferred for the valve member to close a valve seat about its entire circumference, i. that its edge is essentially uninterrupted.
  • the actuator is connected via at least one lever and at least one connecting element, such as a coupling rod with the valve.
  • This offers considerable design freedom while allowing the above-described favorable arrangement of the valve on the "hot” side and the arrangement of the actuator on a cooled component.
  • the freedom of design is further increased by the fact that a ball joint between at least one lever and at least one coupling rod is provided.
  • the coupling rod and at least one lever preferably a lever of the actuator, at least substantially aligned.
  • pressure pulsations may occur in the recirculated exhaust gas which act on the valve element. If the coupling rod and in particular a lever provided on the actuator are aligned with one another, these forces acting on the valve element by the exhaust gas can not change the position of the valve element, since this is effectively blocked or locked.
  • the direction of the force acting on the coupling rod force due to the pressure pulsations namely passes largely through the axis of rotation of the actuator, so that no rotation of the actuator can be generated.
  • the actuator comprise at least one position sensor.
  • an exhaust gas recirculation valve which determines the amount of recirculated exhaust gas. Accordingly, the actuator of an exhaust gas recirculation valve is preferably attached to the radiator housing.
  • bypass valve It has proven to be beneficial for the bypass valve to connect this with a vacuum actuator or an electric actuator.
  • exhaust gas recirculation system 10 has a radiator 12, a (in Fig. 1 unrecognizable) exhaust gas recirculation valve, an actuator 14 for this purpose, a bypass valve 16 and a vacuum actuator 18 for the bypass valve 16.
  • the supply of the exhaust gas to be recirculated takes place through the inflow 20.
  • This has in the embodiment shown at its end a flange 22 for connection to the exhaust gas recirculation line.
  • the feeder 20 has a bend of approximately 90 °, at the end of which the exhaust gas recirculation valve actuated by the actuator 14 is provided.
  • the exhaust gas recirculation valve may be configured as described above, and controls the amount of recirculated exhaust gas.
  • bypass valve 16 Downstream of the flow direction is the bypass valve 16 which, in the embodiment shown, controls the amount of exhaust gas which is passed through a correspondingly insulated (unrecognizable) bypass pipe in order to achieve a significantly lower cooling effect than for those pipes (not recognizable) which are also, but not or slightly isolated, passed through the radiator 12.
  • the radiator 12 has a housing 24, in which both at least one bypass pipe and those lines are arranged, through which the exhaust gas to be cooled flows.
  • the said pipes and tubes are lapped by coolant, for example water, by suitable inflows and outflows, of which Fig. 1 one denoted by "26", is added and removed.
  • the actuator 14 is arranged for the exhaust gas recirculation valve and accordingly protected against unfavorable, too high temperatures.
  • the actuator 14 is designed, for example as a DC motor, and the motor shaft is followed by a gear 28, which in more detail in Fig. 2 can be seen.
  • the output of the transmission is effected by a lever 30, which is connected in the case shown via a ball joint with a coupling rod 32. About another ball joint, the connection is made with a lever 34 which is attached to the rotary shaft of the exhaust gas recirculation valve.
  • a lever 34 which is attached to the rotary shaft of the exhaust gas recirculation valve.
  • Fig. 2 This is supplementary in Fig. 2 recognizable, showing a top view with removed gear cover. Accordingly, the motor shaft can be seen with a comparatively small pinion 36, which acts on a comparatively large pinion 38. This is connected to another small pinion 40, which is engaged with a toothed segment 42. This segment 42 is connected to the lever 30, from which the force on the coupling rod 32 and the lever 34 (see. Fig. 1 ) is transmitted to the exhaust gas recirculation valve. The size of the toothed segment 42 corresponds approximately to the intended range of motion. In Fig. 2 It can also be seen that the actuator, in the case shown on the toothed segment 42, has a position sensor 44. Finally go out Fig. 2 further inflows or outflows 26 for the liquid coolant out. In the embodiment shown, a holder 46 is further provided for mounting the exhaust gas recirculation system to a surrounding component.
  • Fig. 3 shows an exhaust gas recirculation system, in particular with regard to the transmission of the force from the actuator 14 to the (in Fig. 3 also not recognizable) exhaust gas recirculation valve is designed differently.
  • the "output" of the actuator or its transmission is again formed by a lever 30, which in turn is connected via a ball joint with a coupling rod 32.
  • the connection from the coupling rod 32 to the exhaust gas recirculation valve is also via a ball joint and connected to the axis of rotation of the exhaust gas recirculation valve lever 34.
  • the lever 30 and the coupling rod 32 are in a nearly parallel orientation.
  • the lever 34 could lie in a common plane with the lever 30 and the coupling rod 32, but is in the embodiment of Fig. 3 a little, as shown by Fig. 3 , "tilted" in the direction of the viewer.
  • Out Fig. 3 is a preferred measure to recognize that in the in Fig. 3 shown closed or slightly open state of the exhaust gas recirculation valve, the coupling rod 32 and provided on the actuator lever 30 are largely aligned. This has the consequence that pressure pulsations, which can act on the valve element, do not lead to a change in the position of the valve element.
  • the force thus generated extends namely in the direction of the coupling rod 32, thus in the direction of the lever 30 and thus largely by the axis of rotation 48 of the lever 30. Because the force largely passes through this axis, is of the pressure pulsations, for lack of a lever arm, no Torque applied to the lever, so that there is no risk that the position of the valve element changed by such pressure pulsations.
  • the exhaust gas recirculation system according to the invention thus provides a high level of operational reliability.
  • Fig. 4 can be seen from the sectional view of the exhaust gas recirculation valve 50, which is shown in its open position.
  • the axis of rotation 52 is for the reasons given above in two directions with respect to the valve 50 eccentric. Firstly, the axis of rotation in the flow direction A is offset from the valve 50, so that the axis of rotation 52 does not extend through the valve 50, which accordingly has an uninterrupted circumference and closes the valve seat 54 along its entire circumference.
  • the axis of rotation 52 as shown by Fig. 4 offset to the bottom, which means that the valve in the open state, that it is located at most on the edge of the flow and this affects only a small extent.
  • both the valve seat 54 and the edge of the valve 50 is conically formed on its side facing the valve seat 54 in order to achieve the most reliable possible sealing.
  • the bypass valve 16 can be seen, which has at its one end a rotation axis 56 and is designed as a kind of trumpet valve.
  • the bypass valve 16 closes the area leading to tubes that are cooled in the radiator 12.
  • the bypass valve closes the bypass line, so that the recirculated exhaust gas flows completely through the example in the radiator water-purged pipes and is cooled accordingly.
  • the bypass valve 16 and the exhaust gas recirculation valve 50 are integrated into a common one-piece housing 58.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Lift Valve (AREA)
  • Exhaust Silencers (AREA)

Abstract

The system (10) has a cooler (12) with a housing (24) and a valve that comprises a rotatably operated valve element on an inflow side (20). An actuator (14) for the valve is attached to the cooler housing, and is connected with the valve by a lever (30) and connecting element i.e. coupling bar (32). A ball joint is provided between the lever and the connecting element, and the valve element is eccentrically provided with respect to a rotation axis in a direction. The valve element locks a valve seat around an entire circumference of the seat.

Description

Technisches GebietTechnical area

Die Erfindung betrifft ein Abgasrückführsystem.The invention relates to an exhaust gas recirculation system.

Auf dem Gebiet der Verbrennungsmotoren ist es bekannt, in Abhängigkeit vom Betriebszustand Abgas auf die Frischluftseite zurückzuführen, um den Kraftstoffverbrauch und die Schadstoffemission zu senken. In diesem Zusammenhang kann das Abgas ferner, ebenfalls in Abhängigkeit vom Betriebszustand, zumindest teilweise durch einen Abgaskühler geleitet werden, um die Temperatur des rückgeführten Abgases gezielt einzustellen.In the field of internal combustion engines, it is known to recirculate exhaust gas to the fresh air side, depending on the operating state, in order to reduce fuel consumption and pollutant emission. In this context, the exhaust gas can also be passed, at least partially, through an exhaust gas cooler, also depending on the operating state, in order to set the temperature of the recirculated exhaust gas in a targeted manner.

Stand der TechnikState of the art

Aus der EP 0 916 837 A1 ist eine Vorrichtung zur Abgasrückführung bekannt, bei dem ein Stellelement für ein Ventil, das die rückgeführte Abgasmenge bestimmt, an einem Flansch des Abgaskühlers angebracht ist.From the EP 0 916 837 A1 For example, a device for exhaust gas recirculation is known in which an actuator for a valve which determines the amount of recirculated exhaust gas is attached to a flange of the exhaust gas cooler.

Die JP 9-88727 betrifft einen Abgaskühler, in dessen Innerem ein translatorisch bewegbares Ventil vorgesehen ist, dessen Stellelement an einem Mantel des Abgaskühlers angebracht ist.The JP 9-88727 relates to an exhaust gas cooler, inside which a translationally movable valve is provided, the adjusting element is mounted on a jacket of the exhaust gas cooler.

Die EP 1 251 263 A2 offenbart ein Abgasrückführsystem nach dem Oberbegriff des Anspruchs 1.The EP 1 251 263 A2 discloses an exhaust gas recirculation system according to the preamble of claim 1.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt die Aufgabe zugrunde, ein Abgasrückführsystem zu schaffen, das unter allen vorkommenden Betriebsbedingungen einen besonders zuverlässigen Betrieb ermöglicht.The invention has for its object to provide an exhaust gas recirculation system, which allows a particularly reliable operation under all operating conditions.

Die Lösung dieser Aufgabe erfolgt durch das im Anspruch 1 beschriebene Abgasrückführsystem.The solution of this object is achieved by the exhaust gas recirculation system described in claim 1.

Demzufolge weist dieses zumindest einen Kühler mit einem Gehäuse sowie zumindest ein schwenkend oder drehend betätigbares Ventil auf einer Zuströmseite auf. Das Gehäuse des Kühlers wird beispielsweise dazu genutzt, diejenigen Leitungen, durch die das rückzuführende Abgas strömt, sowie gegebenenfalls eine in geeigneter Weise isolierte Bypassleitung aufzunehmen. In dem Gehäuse befindet sich im Betrieb ein Kühlmittel, wie z.B. Wasser, das die genannten Leitungen umströmt, und damit das durch die entsprechenden Leitungen geführte Abgas kühlt. Das Bypassrohr ist entweder außerhalb des Kühlergehäuses vorgesehen, oder innerhalb desselben und in geeigneter Weise isoliert, so dass hier eine wesentlich weniger umfangreiche Kühlung des rückgeführten Abgases erfolgt. Insbesondere kann der Kühler des hierin beschriebenen Abgasrückführsystems so gestaltet sein, wie dies in der EP 1 277 945 A1 der Anmelderin beschrieben ist.Accordingly, this has at least one cooler with a housing and at least one pivotally or rotatably operable valve on an inflow side. The housing of the radiator is used, for example, to receive those lines through which the exhaust gas to be recirculated, and optionally a suitably insulated bypass line. In operation, a coolant, such as water, flows around the housing in the housing, thereby cooling the exhaust gas passing through the respective lines. The bypass tube is provided either outside the radiator housing, or within the same and suitably isolated, so that there is a much less extensive cooling of the recirculated exhaust gas. In particular, the radiator of the exhaust gas recirculation system described herein may be configured as shown in FIG EP 1 277 945 A1 the applicant is described.

Die Anordnung des Ventils auf der Zuströmseite bietet den Vorteil, dass hier das Abgas vergleichsweise heiß ist, so dass eine deutlich verringerte Gefahr von Ablagerungen und Verschmutzungen besteht, die zu Verklebungen des Ventils auf seinem Ventilsitz führen könnten. Wenn dennoch derartige Probleme auftreten, die zu einem gewissen Anhaften des Ventils an seinem Ventilsitz führen können, bietet die erfindungsgemäße Ausgestaltung des Ventils als schwenkend betätigtes Ventil Vorteile. Hierunter wird verstanden, dass nicht nur der Aktuator für das Ventil schwenkend gestaltet ist, sondern dass sich auch das Ventil bzw. das Ventilelement selbst zwischen der geschlossenen und der geöffneten Stellung, sowie umgekehrt, schwenkend bewegt. Hierdurch kann, wie nachfolgend genauer beschrieben, mit einfachen Mitteln ein sicherer Betrieb, insbesondere im Hinblick auf ein zuverlässiges Öffnen gewährleistet werden. Insbesondere kann es sich bei dem Ventil um das in der EP 1 245 820 A1 der Rechtsvorgängerin der Anmelderin beschriebene Ventil handeln. Ferner kann ein schwenkend betätigtes Ventilelement in günstiger Weise und vergleichsweise einfachen Mitteln so angeordnet werden, dass es auch im geöffneten Zustand die Strömung des Abgases möglichst wenig beeinflusst und damit der Strömungswiderstand am Ventil minimiert wird. Diesbezüglich sei auf die EP 1 544 449 A1 der Anmelderin verwiesen.The arrangement of the valve on the inflow side has the advantage that here the exhaust gas is relatively hot, so that there is a significantly reduced risk of deposits and contamination, which could lead to sticking of the valve on his valve seat. Nevertheless, if such problems occur, which can lead to a certain adhesion of the valve to its valve seat, the inventive design of the valve as a pivotally actuated valve offers advantages. This is understood to mean that not only the actuator for the valve is designed to pivot, but also that the valve or the valve element itself between the closed and the open position, and vice versa, moves pivoting. This can, as described in more detail below, with simple means safe operation, especially with regard to reliable opening guaranteed. In particular, it may be in the valve to that in the EP 1 245 820 A1 act the legal predecessor of the Applicant described valve. Furthermore, a pivotally actuated valve element can be arranged in a favorable manner and comparatively simple means so that it influences the flow of the exhaust gas as little as possible even in the open state and thus the flow resistance at the valve is minimized. In this regard, be on the EP 1 544 449 A1 referred to the applicant.

Wenngleich es die genannten Vorteile bietet, das Ventil auf der Zuströmseite anzuordnen, ist dieser Bereich aufgrund der auftretenden Temperaturen für den Aktuator des Ventils ungünstig. Hierzu ist erfindungsgemäß vorgesehen, dass der Aktuator für das Ventil an dem Kühlergehäuse vorgesehen ist. Hierdurch kann in vorteilhafter Weise eine Kühlung des Aktuators erfolgen. Insbesondere wird eine übermäßige Erwärmung des Aktuators vermieden, so dass eine hohe Betriebssicherheit erreicht wird. Wie erwähnt, kann das Kühlergehäuse beispielsweise das (üblicherweise flüssige) Kühlmittel aufnehmen, das zur Kühlung des durch die entsprechenden Leitungen strömenden Abgases verwendet wird. Hierdurch ist auch das Kühlergehäuse selbst gekühlt, so dass sich in vorteilhafter Weise der entsprechende Kühleffekt für den Aktuator ergibt. Der Aktuator kann auch als Stellelement bezeichnet sein und kann beispielsweise als Elektromotor, insbesondere DC-Motor ausgeführt sein.Although it offers the stated advantages to arrange the valve on the upstream side, this range is unfavorable due to the temperatures occurring for the actuator of the valve. For this purpose, the invention provides that the actuator for the valve is provided on the radiator housing. This can be done in an advantageous manner, a cooling of the actuator. In particular, excessive heating of the actuator is avoided, so that a high degree of operational reliability is achieved. As mentioned, the radiator housing may, for example, receive the (usually liquid) coolant used to cool the exhaust gas flowing through the respective ducts. As a result, the cooler housing itself is cooled, so that advantageously results in the corresponding cooling effect for the actuator. The actuator may also be referred to as an actuating element and may be embodied, for example, as an electric motor, in particular a DC motor.

Vorteilhafte Weiterbildungen des erfindungsgemäßen Abgasrückführsystems sind in den weiteren Ansprüchen beschrieben.Advantageous developments of the exhaust gas recirculation system according to the invention are described in the further claims.

Bei einem schwenkend betätigten, beispielsweise weitgehend kreisrunden Ventil bietet die Anordnung der Drehachse stets eine besondere Herausforderung. Insbesondere treten häufig Dichtigkeitsprobleme auf, wenn die Drehachse "durch" das Ventilelement verläuft und insoweit der Rand des Ventilelements unterbrochen ist. Vor diesem Hintergrund wird bevorzugt, dass das Ventilelement bezüglich seiner Drehachse zumindest einfach exzentrisch vorgesehen ist. Mit anderen Worten kann die Drehachse von dem Ventilelement, im geschlossenen Zustand betrachtet, in Strömungsrichtung oder entgegengesetzt hierzu versetzt sein, so dass der Rand des Ventilelements nicht unterbrochen werden muss und ein zuverlässiges Schließen gewährleistet werden kann. Alternativ oder ergänzend hierzu kann die Drehachse bezüglich des Ventilelements, erneut im geschlossenen Zustand betrachtet, in einer Richtung senkrecht zu der Strömungsrichtung versetzt, d.h. exzentrisch, vorgesehen sein.In a pivotally operated, for example, largely circular valve, the arrangement of the axis of rotation always presents a special challenge. In particular, leakage problems frequently occur when the axis of rotation extends "through" the valve element and insofar the edge of the valve element is interrupted. Against this background, it is preferred that the valve element is at least simply provided eccentrically with respect to its axis of rotation. In other words, the axis of rotation of the valve element, when viewed in the closed state, be offset in the flow direction or opposite thereto, so that the edge of the valve element does not need to be interrupted and a reliable closing can be ensured. Alternatively or additionally, the axis of rotation with respect to the valve element, again considered in the closed state, offset in a direction perpendicular to the flow direction, i. eccentric, be provided.

Wie bereits angedeutet, wird aus Gründen des zuverlässigen Schließens für das Ventilelement bevorzugt, dass dieses einen Ventilsitz um seinen gesamten Umfang verschließt, d.h. dass sein Rand im Wesentlichen nicht unterbrochen ist.As already indicated, for reasons of reliable closure, it is preferred for the valve member to close a valve seat about its entire circumference, i. that its edge is essentially uninterrupted.

Der Aktuator ist über zumindest einen Hebel und zumindest ein Verbindungselement, wie eine Koppelstange mit dem Ventil verbunden. Dies bietet erhebliche gestalterische Freiheiten und ermöglicht gleichzeitig die oben beschriebene günstige Anordnung des Ventils auf der "heißen" Seite und die Anordnung des Aktuators an einem gekühlten Bauteil.The actuator is connected via at least one lever and at least one connecting element, such as a coupling rod with the valve. This offers considerable design freedom while allowing the above-described favorable arrangement of the valve on the "hot" side and the arrangement of the actuator on a cooled component.

Die Gestaltungsfreiheit wird weiter dadurch erhöht, dass ein Kugelgelenk zwischen zumindest einem Hebel und zumindest einer Koppelstange vorgesehen ist.The freedom of design is further increased by the fact that a ball joint between at least one lever and at least one coupling rod is provided.

Für den zuverlässigen Betrieb, insbesondere bei einem geringfügigen Öffnen des Ventils, ist es günstig, wenn in einem zumindest nahezu geschlossenen Zustand des Ventils die Koppelstange und zumindest ein Hebel, bevorzugt ein Hebel des Aktuators, miteinander zumindest weitgehend fluchten. In dem beschriebenen geringfügig geöffneten Zustand können in dem rückgeführten Abgas Druckpulsationen auftreten, die auf das Ventilelement einwirken. Wenn die Koppelstange und insbesondere ein an dem Aktuator vorgesehener Hebel miteinander fluchten, können diese von dem Abgas auf das Ventilelement wirkenden Kräfte die Stellung des Ventilelements nicht ändern, da dieses gewissermaßen blockiert oder gesperrt ist. Die Richtung der auf die Koppelstange wirkenden Kraft infolge der Druckpulsationen verläuft nämlich weitgehend durch die Drehachse des Aktuators, so dass keine Drehung des Aktuators erzeugt werden kann. Insbesondere in Kombination mit einem zumindest einfach exzentrisch vorgesehenen Ventilelement, das im Hinblick auf den Abgasdruck nicht vollständig ausgeglichen ist, hat sich die beschriebene Maßnahme, das weitgehende Fluchten der Koppelstange und zumindest eines Hebels in einem geringfügig geöffneten Zustand des Ventilelements, als äußerst günstig erwiesen. Selbst die Neigung eines nicht balancierten Ventilelements, seine Stellung infolge von Pulsationen des Abgasdrucks zu verändern, wird nämlich unterbunden. Insoweit kann der beschriebene Mechanismus zwischen Aktuator und Ventil als selbsthemmend bezeichnet werden. Im Hinblick hierauf sowie auf weitere Einzelheiten des beschriebenen Mechanismus wird auf die EP 1 462 643 A1 und EP 1 640 593 A1 der Anmelderin verwiesen.For reliable operation, in particular with a slight opening of the valve, it is favorable if in an at least almost closed state of the valve, the coupling rod and at least one lever, preferably a lever of the actuator, at least substantially aligned. In the described slightly open state, pressure pulsations may occur in the recirculated exhaust gas which act on the valve element. If the coupling rod and in particular a lever provided on the actuator are aligned with one another, these forces acting on the valve element by the exhaust gas can not change the position of the valve element, since this is effectively blocked or locked. The direction of the force acting on the coupling rod force due to the pressure pulsations namely passes largely through the axis of rotation of the actuator, so that no rotation of the actuator can be generated. In particular, in combination with an at least simply eccentrically provided valve element, which is not fully balanced in terms of exhaust pressure, the described measure, the extensive alignment of the coupling rod and at least one lever in a slightly open state of the valve element, has proven to be extremely favorable. Even the tendency of a non-balanced valve element to change its position due to pulsations of the exhaust gas pressure is in fact prevented. In that regard, the mechanism described between the actuator and valve can be referred to as self-locking. In view of this, as well as further details of the described mechanism is on the EP 1 462 643 A1 and EP 1 640 593 A1 referred to the applicant.

Für den zuverlässigen Betrieb und die Möglichkeit, die Stellung des Ventils zu steuern oder zu regeln, wird derzeit bevorzugt, dass der Aktuator zumindest einen Positionssensor aufweist.For reliable operation and the ability to control or regulate the position of the valve, it is presently preferred that the actuator comprise at least one position sensor.

Als das beschriebene Ventil kann beispielsweise ein Abgasrückführventil vorgesehen sein, das die Menge des rückgeführten Abgases bestimmt. Dementsprechend ist bevorzugt der Aktuator eines Abgasrückführventils an dem Kühlergehäuse angebracht.As the described valve may be provided, for example, an exhaust gas recirculation valve, which determines the amount of recirculated exhaust gas. Accordingly, the actuator of an exhaust gas recirculation valve is preferably attached to the radiator housing.

Zur Regelung der Temperatur des rückgeführten Abgases wird ferner bevorzugt, zusätzlich ein (Kühler-)Bypassventil vorzusehen, so dass insgesamt die Temperatur des rückgeführten Abgases gezielter eingestellt werden kann. Diesbezüglich bietet es im Hinblick auf die Kompaktheit des Abgasrückführsystems Vorteile, wenn zumindest zwei Ventile, beispielsweise ein Abgasrückführventil und ein Bypassventil, in ein Gehäuse integriert sind.To control the temperature of the recirculated exhaust gas is also preferred, in addition to provide a (radiator) bypass valve, so that overall the temperature of the recirculated exhaust gas can be set more targeted. In this regard, it provides advantages in terms of compactness of the exhaust gas recirculation system when at least two valves, such as an exhaust gas recirculation valve and a bypass valve, are integrated into a housing.

Hierbei hat es sich für das Bypassventil als günstig erwiesen, dieses mit einem Vakuumaktuator oder einem elektrischen Aktuator zu verbinden.It has proven to be beneficial for the bypass valve to connect this with a vacuum actuator or an electric actuator.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Nachfolgend wird die Erfindung anhand beispielhaft in den Zeichnungen dargestellter Ausführungsformen näher erläutert. Es zeigen:

Fig. 1
eine perspektivische Unteransicht eines erfindungsgemäßen Abgasrückführsystems in einer ersten Ausführungsform;
Fig. 2
eine Draufsicht auf das Abgasrückführsystem gemäß Fig. 1 mit abgenommener Abdeckung eines Aktuatorgetriebes;
Fig. 3
eine Seitenansicht eines Abgasrückführsystems; und
Fig. 4
eine Schnittansicht eines Teils des erfindungsgemäßen Abgasrückführsystems.
The invention will be explained in more detail with reference to exemplary embodiments shown in the drawings. Show it:
Fig. 1
a perspective bottom view of an exhaust gas recirculation system according to the invention in a first embodiment;
Fig. 2
a plan view of the exhaust gas recirculation system according to Fig. 1 with removed cover of Aktuatorgetriebes;
Fig. 3
a side view of an exhaust gas recirculation system; and
Fig. 4
a sectional view of a portion of the exhaust gas recirculation system according to the invention.

Ausführliche Beschreibung bevorzugter Ausführunasformen der ErfindungDetailed Description of Preferred Embodiments of the Invention

Das in Fig. 1 dargestellte Abgasrückführsystem 10 weist einen Kühler 12, ein (in Fig. 1 nicht zu erkennendes) Abgasrückführventil, einen Aktuator 14 hierfür, ein Bypassventil 16 sowie einen Vakuumaktuator 18 für das Bypassventil 16 auf. Die Zufuhr des rückzuführenden Abgases erfolgt durch die Zuströmung 20. Diese weist bei dem gezeigten Ausführungsbeispiel an ihrem Ende einen Flansch 22 zur Verbindung mit der Abgasrückführleitung auf. Bei der gezeigten Ausführungsform weist die Zuführung 20 einen Knick um etwa 90° auf, an dessen Ende das durch den Aktuator 14 betätigte Abgasrückführventil vorgesehen ist. Das Abgasrückführventil kann so gestaltet sein, wie oben beschrieben, und steuert die rückgeführte Abgasmenge. In Strömungsrichtung nachfolgend befindet sich das Bypassventil 16, das bei der gezeigten Ausführungsform diejenige Abgasmenge steuert, die durch ein entsprechend isoliertes (nicht erkennbares) Bypassrohr geführt wird, um eine deutlich geringere Kühlwirkung zu erreichen, als dies für diejenigen (nicht erkennbaren) Leitungen der Fall ist, die ebenfalls, jedoch nicht oder geringfügig isoliert, durch den Kühler 12 geführt werden.This in Fig. 1 shown exhaust gas recirculation system 10 has a radiator 12, a (in Fig. 1 unrecognizable) exhaust gas recirculation valve, an actuator 14 for this purpose, a bypass valve 16 and a vacuum actuator 18 for the bypass valve 16. The supply of the exhaust gas to be recirculated takes place through the inflow 20. This has in the embodiment shown at its end a flange 22 for connection to the exhaust gas recirculation line. In the embodiment shown, the feeder 20 has a bend of approximately 90 °, at the end of which the exhaust gas recirculation valve actuated by the actuator 14 is provided. The exhaust gas recirculation valve may be configured as described above, and controls the amount of recirculated exhaust gas. Downstream of the flow direction is the bypass valve 16 which, in the embodiment shown, controls the amount of exhaust gas which is passed through a correspondingly insulated (unrecognizable) bypass pipe in order to achieve a significantly lower cooling effect than for those pipes (not recognizable) which are also, but not or slightly isolated, passed through the radiator 12.

Bei der gezeigten Ausführungsform weist der Kühler 12 ein Gehäuse 24 auf, in dem sowohl zumindest ein Bypassrohr als auch diejenigen Leitungen angeordnet sind, durch die das zu kühlende Abgas strömt. Die genannten Leitungen und Rohre werden von Kühlmittel umspült, beispielsweise Wasser, das durch geeignete Zu- und Abflüsse, von denen in Fig. 1 einer mit "26" bezeichnet ist, zu- und abgeführt wird. An dem entsprechend kühlen Kühlergehäuse 24 ist der Aktuator 14 für das Abgasrückführventil angeordnet und dementsprechend vor ungünstigen, zu hohen Temperaturen geschützt. Der Aktuator 14 ist beispielsweise als DC-Motor ausgeführt, und an die Motorwelle schließt sich ein Getriebe 28 an, das genauer in Fig. 2 zu erkennen ist. Der Ausgang des Getriebes erfolgt durch einen Hebel 30, der in dem gezeigten Fall über ein Kugelgelenk mit einer Koppelstange 32 verbunden ist. Über ein weiteres Kugelgelenk erfolgt die Verbindung mit einem Hebel 34, der an der Drehwelle des Abgasrückführventils angebracht ist. Hierdurch, insbesondere durch die Verwendung des Hebels und der Koppelstange 32, ergibt sich die Möglichkeit, den Aktuator 14 in vorteilhafter Weise mit deutlichem Abstand zu der (heißen) Zuströmseite anzuordnen. Ferner ergibt sich, insbesondere in Kombination mit den Kugelgelenken, eine hohe gestalterische Freiheit im Hinblick auf die Lagebeziehung zwischen dem Abgasrückführventil und dem Aktuator hierfür.In the embodiment shown, the radiator 12 has a housing 24, in which both at least one bypass pipe and those lines are arranged, through which the exhaust gas to be cooled flows. The said pipes and tubes are lapped by coolant, for example water, by suitable inflows and outflows, of which Fig. 1 one denoted by "26", is added and removed. At the corresponding cool radiator housing 24, the actuator 14 is arranged for the exhaust gas recirculation valve and accordingly protected against unfavorable, too high temperatures. The actuator 14 is designed, for example as a DC motor, and the motor shaft is followed by a gear 28, which in more detail in Fig. 2 can be seen. The output of the transmission is effected by a lever 30, which is connected in the case shown via a ball joint with a coupling rod 32. About another ball joint, the connection is made with a lever 34 which is attached to the rotary shaft of the exhaust gas recirculation valve. In this way, in particular by the use of the lever and the coupling rod 32, there is the possibility to arrange the actuator 14 in an advantageous manner with a clear distance to the (hot) inflow side. Furthermore, in particular in combination with the ball joints, there is a high freedom of design with regard to the positional relationship between the exhaust gas recirculation valve and the actuator for this purpose.

Dies ist ergänzend in Fig. 2 zu erkennen, die eine Draufsicht mit abgenommener Getriebeabdeckung zeigt. Dementsprechend ist die Motorwelle mit einem vergleichsweise kleinen Ritzel 36 zu erkennen, das auf ein vergleichsweise großes Ritzel 38 wirkt. Dieses ist mit einem weiteren kleinen Ritzel 40 verbunden, das mit einem gezahnten Segment 42 in Eingriff ist. Dieses Segment 42 ist mit dem Hebel 30 verbunden, von dem die Kraft auf die Koppelstange 32 und über den Hebel 34 (vgl. Fig. 1) auf das Abgasrückführventil übertragen wird. Die Größe des Zahnsegments 42 entspricht in etwa dem vorgesehenen Bewegungsbereich. In Fig. 2 ist ferner zu erkennen, dass der Aktuator, in dem gezeigten Fall an dem Zahnsegment 42, einen Positionssensor 44 aufweist. Schließlich gehen aus Fig. 2 weitere Zu- oder Abflüsse 26 für das flüssige Kühlmittel hervor. Bei der gezeigten Ausführungsform ist ferner eine Halterung 46 zur Anbringung des Abgasrückführsystems an ein umliegendes Bauteil vorgesehen.This is supplementary in Fig. 2 recognizable, showing a top view with removed gear cover. Accordingly, the motor shaft can be seen with a comparatively small pinion 36, which acts on a comparatively large pinion 38. This is connected to another small pinion 40, which is engaged with a toothed segment 42. This segment 42 is connected to the lever 30, from which the force on the coupling rod 32 and the lever 34 (see. Fig. 1 ) is transmitted to the exhaust gas recirculation valve. The size of the toothed segment 42 corresponds approximately to the intended range of motion. In Fig. 2 It can also be seen that the actuator, in the case shown on the toothed segment 42, has a position sensor 44. Finally go out Fig. 2 further inflows or outflows 26 for the liquid coolant out. In the embodiment shown, a holder 46 is further provided for mounting the exhaust gas recirculation system to a surrounding component.

Fig. 3 zeigt ein Abgasrückführsystem, das insbesondere im Hinblick auf die Übertragung der Kraft von dem Aktuator 14 zu dem (in Fig. 3 ebenfalls nicht erkennbaren) Abgasrückführventil anders gestaltet ist. Der "Ausgang" des Aktuators bzw. dessen Getriebe wird erneut durch einen Hebel 30 gebildet, der wiederum über ein Kugelgelenk mit einer Koppelstange 32 verbunden ist. Die Verbindung von der Koppelstange 32 zu dem Abgasrückführventil erfolgt ebenfalls über ein Kugelgelenk und einen mit der Drehachse des Abgasrückführventils verbundenen Hebel 34. Bei der gezeigten Ausführungsform befinden sich jedoch der Hebel 30 und die Koppelstange 32 in einer nahezu parallelen Ausrichtung. Der Hebel 34 könnte in einer gemeinsamen Ebene mit dem Hebel 30 und der Koppelstange 32 liegen, ist jedoch bei der Ausführungsform von Fig. 3 ein wenig, gemäß der Darstellung von Fig. 3, in Richtung des Betrachters "gekippt". Fig. 3 shows an exhaust gas recirculation system, in particular with regard to the transmission of the force from the actuator 14 to the (in Fig. 3 also not recognizable) exhaust gas recirculation valve is designed differently. The "output" of the actuator or its transmission is again formed by a lever 30, which in turn is connected via a ball joint with a coupling rod 32. The connection from the coupling rod 32 to the exhaust gas recirculation valve is also via a ball joint and connected to the axis of rotation of the exhaust gas recirculation valve lever 34. In the embodiment shown, however, the lever 30 and the coupling rod 32 are in a nearly parallel orientation. The lever 34 could lie in a common plane with the lever 30 and the coupling rod 32, but is in the embodiment of Fig. 3 a little, as shown by Fig. 3 , "tilted" in the direction of the viewer.

Aus Fig. 3 ist eine bevorzugte Maßnahme dahingehend zu erkennen, dass in dem in Fig. 3 gezeigten geschlossenen oder geringfügig geöffneten Zustand des Abgasrückführventils die Koppelstange 32 und der an dem Aktuator vorgesehene Hebel 30 weitgehend miteinander fluchten. Dies hat zur Folge, dass Druckpulsationen, die auf das Ventilelement wirken können, nicht zu einer Veränderung der Stellung des Ventilelements führen. Die hierdurch erzeugte Kraft verläuft nämlich in Richtung der Koppelstange 32, damit in Richtung des Hebels 30 und somit weitgehend durch die Drehachse 48 des Hebels 30. Dadurch, dass die Kraft weitgehend durch diese Achse verläuft, wird von den Druckpulsationen, mangels eines Hebelarms, kein Drehmoment auf den Hebel aufgebracht, so dass keine Gefahr besteht, dass sich die Stellung des Ventilelements durch derartige Druckpulsationen verändert.Out Fig. 3 is a preferred measure to recognize that in the in Fig. 3 shown closed or slightly open state of the exhaust gas recirculation valve, the coupling rod 32 and provided on the actuator lever 30 are largely aligned. This has the consequence that pressure pulsations, which can act on the valve element, do not lead to a change in the position of the valve element. The force thus generated extends namely in the direction of the coupling rod 32, thus in the direction of the lever 30 and thus largely by the axis of rotation 48 of the lever 30. Because the force largely passes through this axis, is of the pressure pulsations, for lack of a lever arm, no Torque applied to the lever, so that there is no risk that the position of the valve element changed by such pressure pulsations.

Auch in dieser Hinsicht bietet das erfindungsgemäße Abgasrückführsystem somit eine hohe Betriebssicherheit.Also in this regard, the exhaust gas recirculation system according to the invention thus provides a high level of operational reliability.

In Fig. 4 ist anhand der Schnittdarstellung das Abgasrückführventil 50 zu erkennen, das in seiner geöffneten Stellung gezeigt ist. Die Drehachse 52 ist aus den oben angegebenen Gründen in zweifacher Richtung gegenüber dem Ventil 50 exzentrisch. Zum einen ist die Drehachse in der Strömungsrichtung A von dem Ventil 50 versetzt, so dass sich die Drehachse 52 nicht durch das Ventil 50 erstreckt, das dementsprechend einen ununterbrochenen Umfang aufweist und den Ventilsitz 54 entlang seines gesamten Umfangs verschließt. Darüber hinaus ist die Drehachse 52 gemäß der Darstellung von Fig. 4 zur Unterseite hin versetzt, was für das Ventil im geöffneten Zustand bedeutet, dass es sich allenfalls am Rande der Strömung befindet und diese nur in geringem Umfang beeinflusst. Wie in der Fig. 4 zu erkennen ist, ist sowohl der Ventilsitz 54 als auch der Rand des Ventils 50 an seiner zu dem Ventilsitz 54 gerichteten Seite konisch ausgebildet, um eine möglichst zuverlässige Abdichtung zu erreichen.In Fig. 4 can be seen from the sectional view of the exhaust gas recirculation valve 50, which is shown in its open position. The axis of rotation 52 is for the reasons given above in two directions with respect to the valve 50 eccentric. Firstly, the axis of rotation in the flow direction A is offset from the valve 50, so that the axis of rotation 52 does not extend through the valve 50, which accordingly has an uninterrupted circumference and closes the valve seat 54 along its entire circumference. In addition, the axis of rotation 52 as shown by Fig. 4 offset to the bottom, which means that the valve in the open state, that it is located at most on the edge of the flow and this affects only a small extent. Like in the Fig. 4 can be seen, both the valve seat 54 and the edge of the valve 50 is conically formed on its side facing the valve seat 54 in order to achieve the most reliable possible sealing.

In Fig. 4 ist ferner das Bypassventil 16 zu erkennen, das an seinem einen Ende eine Drehachse 56 aufweist und als eine Art Trompetenventil ausgeführt ist. In der in Fig. 4 gezeigten Stellung verschließt das Bypassventil 16 denjenigen Bereich, der zu Rohren führt, die in dem Kühler 12 gekühlt werden. In der anderen Stellung, d.h. gegenüber der in Fig. 4 gezeigten Stellung um etwa 60° entgegen dem Uhrzeigersinn verdreht, verschließt das Bypassventil die Bypassleitung, so dass das rückgeführte Abgas vollständig durch die in dem Kühler beispielsweise mit Wasser umspülten Rohre strömt und dementsprechend gekühlt wird. Anhand der Fig. 4 ist ferner zu erkennen, dass das Bypassventil 16 und das Abgasrückführventil 50 in ein gemeinsames einstückiges Gehäuse 58 integriert sind.In Fig. 4 Further, the bypass valve 16 can be seen, which has at its one end a rotation axis 56 and is designed as a kind of trumpet valve. In the in Fig. 4 As shown, the bypass valve 16 closes the area leading to tubes that are cooled in the radiator 12. In the other position, ie opposite to in Fig. 4 shown rotated by about 60 ° counterclockwise, the bypass valve closes the bypass line, so that the recirculated exhaust gas flows completely through the example in the radiator water-purged pipes and is cooled accordingly. Based on Fig. 4 It can also be seen that the bypass valve 16 and the exhaust gas recirculation valve 50 are integrated into a common one-piece housing 58.

Claims (8)

  1. Exhaust gas recirculation system (10) having at least one cooler (12) with a housing (24) and at least one valve (50) with a pivotably actuated valve member on an inlet side (20), an actuator (14) for the valve being mounted on the housing (24) of the cooler, which actuator is connected to the valve (50) via at least one lever (30, 34) and at least one connection member such as a coupling rod (32),
    characterised in that an actuator shaft is arranged transverse to an axis of rotation (52) of the valve member and that a ball and socket joint is provided between at least one lever (30, 34) and at least one connection member such as a coupling rod (32).
  2. Exhaust gas recirculation system according to claim 1,
    characterised in that the valve member is provided eccentrically at least in one direction with respect to the axis of rotation (52) thereof.
  3. Exhaust gas recirculation system according to claim 1 or 2,
    characterised in that the valve member closes a valve seat (54) around its entire circumference.
  4. Exhaust gas recirculation system according to claim 2 or 3,
    characterised in that the coupling rod (32) and at least one lever (30), preferably a lever (30) of the actuator (14), are at least largely aligned with each other at least in an almost closed state of the valve (50).
  5. Exhaust gas recirculation system according to any one of the preceding claims,
    characterised in that the actuator (14) has at least one position sensor (44).
  6. Exhaust gas recirculation system according to any of the preceding claims,
    characterised in that an exhaust gas recirculation valve is provided as the valve (50), the actuator of which is mounted on the cooler housing (24).
  7. Exhaust gas recirculation system according to any of the preceding claims,
    characterised in that furthermore a cooler bypass valve (16) is provided, which is integrated into a common housing (58) together with the valve (50).
  8. Exhaust gas recirculation system according to claim 7,
    characterised in that the bypass valve (16) is connected to a vacuum actuator (18) or an electric actuator.
EP07014901A 2007-07-30 2007-07-30 Exhaust gas recirculation system Revoked EP2025910B1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
AT07014901T ATE450706T1 (en) 2007-07-30 2007-07-30 EXHAUST GAS RECIRCULATION SYSTEM
PT07014901T PT2025910E (en) 2007-07-30 2007-07-30 Exhaust gas recirculation system
DE502007002202T DE502007002202D1 (en) 2007-07-30 2007-07-30 Exhaust gas recirculation system
EP07014901A EP2025910B1 (en) 2007-07-30 2007-07-30 Exhaust gas recirculation system
ES07014901T ES2337192T3 (en) 2007-07-30 2007-07-30 EXHAUST GAS RECIRCULATION SYSTEM.
US12/182,029 US8353274B2 (en) 2007-07-30 2008-07-29 Exhaust gas recirculation system
KR1020080074053A KR101501772B1 (en) 2007-07-30 2008-07-29 Exhaust gas recirculation system
CNA2008101294435A CN101358566A (en) 2007-07-30 2008-07-29 Exhaust gas recirculation system
KR1020140097494A KR20140103243A (en) 2007-07-30 2014-07-30 Exhaust gas recirculation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07014901A EP2025910B1 (en) 2007-07-30 2007-07-30 Exhaust gas recirculation system

Publications (2)

Publication Number Publication Date
EP2025910A1 EP2025910A1 (en) 2009-02-18
EP2025910B1 true EP2025910B1 (en) 2009-12-02

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EP07014901A Revoked EP2025910B1 (en) 2007-07-30 2007-07-30 Exhaust gas recirculation system

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US (1) US8353274B2 (en)
EP (1) EP2025910B1 (en)
KR (2) KR101501772B1 (en)
CN (1) CN101358566A (en)
AT (1) ATE450706T1 (en)
DE (1) DE502007002202D1 (en)
ES (1) ES2337192T3 (en)
PT (1) PT2025910E (en)

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DE502007002202D1 (en) 2010-01-14
KR101501772B1 (en) 2015-03-11
ATE450706T1 (en) 2009-12-15
US20090139502A1 (en) 2009-06-04
US8353274B2 (en) 2013-01-15
EP2025910A1 (en) 2009-02-18
KR20090013083A (en) 2009-02-04
CN101358566A (en) 2009-02-04
PT2025910E (en) 2010-02-23
ES2337192T3 (en) 2010-04-21
KR20140103243A (en) 2014-08-26

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