EP1926907B1 - Device for controlling an exhaust gas stream - Google Patents

Device for controlling an exhaust gas stream Download PDF

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Publication number
EP1926907B1
EP1926907B1 EP06791380.6A EP06791380A EP1926907B1 EP 1926907 B1 EP1926907 B1 EP 1926907B1 EP 06791380 A EP06791380 A EP 06791380A EP 1926907 B1 EP1926907 B1 EP 1926907B1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
slide
closure element
closure
actuator
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.)
Not-in-force
Application number
EP06791380.6A
Other languages
German (de)
French (fr)
Other versions
EP1926907A2 (en
Inventor
Peter Geskes
Hans-Peter Klein
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.)
Mahle Behr GmbH and Co KG
Mahle Behr Kornwestheim GmbH
Original Assignee
Mahle Behr GmbH and Co KG
Mahle Behr Kornwestheim 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
Application filed by Mahle Behr GmbH and Co KG, Mahle Behr Kornwestheim GmbH filed Critical Mahle Behr GmbH and Co KG
Publication of EP1926907A2 publication Critical patent/EP1926907A2/en
Application granted granted Critical
Publication of EP1926907B1 publication Critical patent/EP1926907B1/en
Not-in-force 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
    • F02M26/65—Constructional details of EGR valves
    • F02M26/66—Lift valves, e.g. poppet valves
    • F02M26/69—Lift valves, e.g. poppet valves having two or more valve-closing members
    • 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
    • F02M26/38—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with two or more EGR valves disposed in parallel
    • 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
    • F02M26/39—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with two or more EGR valves disposed in series
    • 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
    • F02M26/67—Pintles; Spindles; Springs; Bearings; Sealings; Connections to actuators
    • 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
    • F02M26/71—Multi-way valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86718—Dividing into parallel flow paths with recombining
    • Y10T137/86759—Reciprocating

Definitions

  • the present invention relates to a device for controlling an exhaust gas stream according to the preamble of claim 1.
  • the recirculated exhaust gas is generally to be cooled by means of an exhaust gas cooler, wherein to ensure the function regularly a bypass line is arranged parallel to the exhaust gas cooler.
  • a bypass line is arranged parallel to the exhaust gas cooler.
  • control valves are known in which a first valve performs the dosage and a second valve distributes the cooler and bypass.
  • this requires two separate drive units for the butterfly valves.
  • EP-1275838 Another example of such a device is in EP-1275838 shown. It is the object of the invention to provide a device for controlling an exhaust gas flow, which can be produced inexpensively by a small number of required components.
  • the control mechanism By providing the control mechanism with the actuator, it is possible according to the invention to adjust both the first slide element and the second slide element, which regularly requires only a single actuator.
  • one of the at least three connections is preferably connected to an exhaust gas line, an exhaust gas cooler and a bypass line of the exhaust gas cooler.
  • the two slide elements z. B. downstream of the exhaust pipe and distribute the exhaust gas supplied in the exhaust pipe via only one actuator metered on exhaust gas cooler and bypass line.
  • the exhaust pipe of the bypass line and the exhaust gas cooler may be arranged downstream, which brings at least in Norrnal des when guided through the exhaust gas cooler, a lower exhaust gas temperature in the region of the slide elements with it.
  • At least the first slider element is force-urged in the closing direction by means of a spring, whereby a particularly tight closure of the closure member is present in the closed position.
  • the exhaust gas flow preferably exerts a pressure in the opening direction on at least the first closure member.
  • the actuator and the control mechanism can be designed physically small, since only small opening forces are required.
  • the exhaust gas flow can also act in the closing direction on the closure member.
  • a further closing element which is movable relative to the first closure element is provided on at least the first slide element, the closure elements successively releasing an opening associated therewith in the course of an opening movement of the slide element.
  • a substantially two-stage opening of the path of the first slide element can be achieved, which is given by simple means a particularly flexible adjustability of the exhaust gas flow.
  • suitable, for example, conical shape of the closure member and a good stepless adjustability can be realized in addition to the two-stage.
  • the control mechanism comprises at least one rotatably mounted lever in order to deflect the force of the actuator suitably to the slide elements.
  • the control mechanism may also comprise a rotatable shaft with an eccentric element or a link plate.
  • These mechanical elements of the control mechanism are each suitable for themselves or in combination to associate an opening of the first slider element and a second position of the actuator, an opening of the second slider element a first position of the actuator.
  • the actuator may preferably comprise a linear, in particular hydraulic drive unit or alternatively a rotary, in particular electromotive drive unit.
  • each actuator is suitable for combination with a device according to the invention. With a suitable design of the control mechanism, the spatial arrangement of the actuator can be made so that the actuator undergoes only a small heat application by the recirculated exhaust gas.
  • At least the first closure member is plate-shaped. Sealing final valve disc require little space and are inexpensive to produce.
  • At least the first closure member is conical, whereby a suitable shaping of a particularly good adjustability of the opening between the respective terminals is possible.
  • At least the first closure member may comprise a rotatable damper.
  • any suitable from the temperature requirements forth suitable design of a valve closure can be provided.
  • the device according to the first embodiment according to Fig. 1 comprises a housing 1 with a first port 2, a second port 3 and a third port 4.
  • the first port 2 is divided into two, but connected via a suitable, not shown branch to the same exhaust passage for supplying exhaust gas of an internal combustion engine.
  • the two separate according to the schematic sectional view chambers 2a, 2b of the housing 1 are thus subjected to substantially the same exhaust gas pressure.
  • the chamber 3a has a connection 3b to the chamber 2a of the terminal 2 and a connection 3c to the chamber 2b of the terminal 2.
  • the chamber 4a has a connection 4b to the chamber 2a of the terminal 2 and a connection 4c to the chamber 2b of the terminal 2.
  • the compounds 4b, 4c and the compounds 3b, 3c are each in pairs on a common axis.
  • a first slider element 6 is arranged along the connection axis of the connections 4b, 4c. It comprises a translationally movable in its longitudinal direction slide rod 6a, which at an outer opening 6b the housing 1 is slidably guided in a substantially sealing. At one end of the pusher rod 6a is a closure member connected to the valve rod 6a and designed as a valve disk 6c, which can sealingly abut the connection 4c.
  • a second valve disk 6d is slidably mounted on the slide rod 6a and supported against the first valve disk 6c via a spring element 6g. Andemends the pusher rod 6a, this has a slider 6e, wherein a spring 6f between the wall of the chamber 2a and the slider 6e is supported.
  • the spring 6f acts according to the illustration Fig. 1 the first slider element 6 with a leftward force.
  • the second valve plate 6d is pressed by the spring 6g sealingly on the connection 4b, so that the spring 6g exerts a force opposite to the support against the housing 1 of the spring 6f opposite force.
  • the spring 6f is designed to be stronger than the spring 6g, so that the summed spring forces hold both valve disks 6c, 6d in the closed position.
  • a second slide element 7 is arranged, which is constructed in the same way as the first slide element 6, so that its components carry corresponding reference numerals 7a to 7g.
  • the second slide element 7 is arranged on the axis of the connections 3b, 3c so that its valve plates 7c, 7d are arranged to close off the connections 3c, 3b.
  • the second slide element 7 is shown in a fully open position, which can be seen at the shifted to the right position of the slide rod 7a.
  • the first valve disk 7c of the second slide element 7 has a greater distance from its associated opening 3c than the second valve disk 7d from its associated opening 3b.
  • the spring 6g, 7g relaxes gradually between the valve plates until the second valve plate 6d, 7d via a driver, not shown, of the valve rod 6a is also forcibly moved in the opening direction. Due to this two-stage opening, a particularly well-defined metering of the recirculated exhaust gas flow can be effected.
  • a control mechanism 8 comprises a rotatably mounted lever 8 a, wherein the pivot point is stationary relative to the housing 1.
  • the rotatably mounted lever 8a is formed so that when moving in one direction a sliding surface 8b of the lever 8a with the Gleitnocke 6e of the first slider element cooperates and deflection in the opposite direction with the Gleitnocke 7e of the second slide element 7.
  • the respectively non-actuated slide element device in each case out of engagement with the sliding surface 8b of the lever 8a, so that this slide element is closed due to the spring forces described above.
  • An unillustrated actuator is formed in the form of a linear hydraulic force introduction unit.
  • the lever 8a can be drivably moved in one or the other direction, whereby either the first slide element 6 or the second slide element 7 is actuated in the opening direction.
  • the chambers 2 a, 2 b supplying the exhaust gas are respectively connected to the chamber 4 a via the connections 4 b, 4 c.
  • the connection 4 leads to an exhaust gas cooler of the recirculated exhaust gas.
  • the second slide element 7 is actuated in the opening direction, wherein the channels 2a, 2b are connected via the connections 3b, 3c with the channel 3a.
  • the channel 3a is connected via the port 3 with a bypass line in communication, which bypasses the exhaust gas cooler in parallel.
  • valve plates 4b, 4c, 3b, 3c can be at least partially conical and optionally accommodated in corresponding cup-shaped valve seats be to allow an even finer dosage of the recirculated exhaust gas stream.
  • the second embodiment according to Fig. 2 has in contrast to the first embodiment, only a single feeding chamber 102a with a port 102.
  • the feeding chamber 102a is connected via a first connection opening 103b with a chamber 103a of a second terminal 103 and via a connection opening 104b with a chamber 104a of a third terminal 104th Similar to the first embodiment, a first slider element 106 and a second slider element 107 are provided.
  • each of the slide elements 106, 107 has only one valve plate 106c, 107c, which in each case at the end of a corresponding slide rod 106a, 107a is fixed.
  • the two slide rods 106a, 107a are guided in openings 106b, 107b of the housing 101 and are subjected to a force in the closing direction via springs 106f, 107f.
  • At the end of the slide rods 106a, 107a are sliding surfaces 106e, 107e.
  • the control mechanism 108 of the second embodiment comprises a rotatable shaft 108a, which is perpendicular to the slide rods 106a and 107a and each at the height of the sliding surfaces 106e, 107e cam-like eccentric elements 108b, 108c.
  • the eccentric elements 108b, 108c are substantially the same shape, but offset by a rotation angle of 180 ° to each other on the shaft 108a.
  • An unillustrated actuator is formed in the manner of an electric motor and optionally connected via a transmission gear with the rotary shaft 108a. But it may also be a linear hydraulic cylinder, which transmits, for example via a rack and a pinion linear motion in the rotational movement of the rotary shaft 108a.
  • the components, in particular the control mechanisms 8, 108, of the first and the second embodiment can be interchanged.
  • only one of the slide elements can be designed in two stages.
  • the arrangement of the closure members may be acted upon by the exhaust gas pressure in the closing direction or in the opening direction, depending on the arrangement.

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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)
  • Exhaust Silencers (AREA)
  • Mechanically-Actuated Valves (AREA)

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zur Steuerung eines Abgasstroms nach dem Oberbegriff des Anspruchs 1.The present invention relates to a device for controlling an exhaust gas stream according to the preamble of claim 1.

Aktuelle Anforderungen an die Schadstoffemission, insbesondere von Dieselmotoren, haben zu der Entwicklung von Abgas-Rückführsystemen für Verbrennungsmotoren geführt. Das rückgeführte Abgas ist dabei allgemein mittels eines Abgaskühlers zu kühlen, wobei zur Sicherstellung der Funktion regelmäßig eine Bypass-Leitung parallel zu dem Abgaskühler angeordnet ist. Grundsätzlich besteht die Problematik, den heißen und chemisch aggressiven Abgasstrom sowohl in der Dosierung als auch in der Verzweigung auf Abgaskühler oder Bypass zur regeln. Hierzu sind Steuerventile bekannt, bei denen eine erste Stellklappe die Dosierung und eine zweite Stellklappe die Verteilung auf Kühler und Bypass vornimmt. Allgemein sind hierzu zwei separate Antriebseinheiten für die Stellklappen erforderlich. Ein weiteres Beispiel für eine solche vorrichtung ist in der EP-1275838 gezeigt. Es ist die Aufgabe der Erfindung, eine Vorrichtung zur Steuerung eines Abgasstroms anzugeben, die durch eine geringe Anzahl erforderlicher Komponenten kostengünstig herstellbar ist.Current requirements for pollutant emissions, especially of diesel engines, have led to the development of exhaust gas recirculation systems for internal combustion engines. The recirculated exhaust gas is generally to be cooled by means of an exhaust gas cooler, wherein to ensure the function regularly a bypass line is arranged parallel to the exhaust gas cooler. Basically, there is the problem, the hot and chemically aggressive exhaust gas flow in both the dosage and in the branch on the exhaust gas cooler or bypass to regulate. For this purpose, control valves are known in which a first valve performs the dosage and a second valve distributes the cooler and bypass. Generally, this requires two separate drive units for the butterfly valves. Another example of such a device is in EP-1275838 shown. It is the object of the invention to provide a device for controlling an exhaust gas flow, which can be produced inexpensively by a small number of required components.

Diese Aufgabe wird für eine eingangs genannte Vorrichtung erfindungsgemäß mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst.This object is achieved for an aforementioned device according to the invention with the characterizing features of claim 1.

Durch das Vorsehen der Steuermechanik mit dem Aktuator ist es erfindungsgemäß ermöglicht, sowohl das erste Schieberelement als auch das zweite Schieberelement zu verstellen, was regelmäßig nur einen einzigen Aktuator erforderlich macht. Bevorzugt ist dabei je einer der zumindest drei Anschlüsse mit einer Abgasleitung, einem Abgaskühler und einer Bypass-Leitung des Abgaskühlers verbunden. So können die beiden Schieberelemente z. B. der Abgasleitung nachgeordnet sein und das in der Abgasleitung zugeführte Abgas über nur einen Aktuator dosierbar auf Abgaskühler und Bypass-Leitung verteilen. Alternativ kann die Abgasleitung der Bypass-Leitung und dem Abgaskühler nachgeordnet sein, was zumindest im Norrnalbetrieb bei Führung über den Abgaskühler eine niedrigere Abgastemperatur im Bereich der Schieberelemente mit sich bringt.By providing the control mechanism with the actuator, it is possible according to the invention to adjust both the first slide element and the second slide element, which regularly requires only a single actuator. In each case one of the at least three connections is preferably connected to an exhaust gas line, an exhaust gas cooler and a bypass line of the exhaust gas cooler. Thus, the two slide elements z. B. downstream of the exhaust pipe and distribute the exhaust gas supplied in the exhaust pipe via only one actuator metered on exhaust gas cooler and bypass line. Alternatively, the exhaust pipe of the bypass line and the exhaust gas cooler may be arranged downstream, which brings at least in Norrnalbetrieb when guided through the exhaust gas cooler, a lower exhaust gas temperature in the region of the slide elements with it.

In bevorzugter Ausführung ist zumindest das erste Schieberelement mittels einer Feder in Schließrichtung kraftbeaufschlagbar, wodurch ein besonders dichter Verschluss des Verschlussgliedes in geschlossener Stellung vorliegt.In a preferred embodiment, at least the first slider element is force-urged in the closing direction by means of a spring, whereby a particularly tight closure of the closure member is present in the closed position.

Weiterhin bevorzugt übt der Abgasstrom auf zumindest das erste Verschlussglied einen Druck in Öffnungsrichtung aus. Hierdurch können der Aktuator und auch die Steuermechanik kleinbauend ausgelegt werden, da nur geringe Öffnungskräfte erforderlich sind. Alternativ kann der Abgasstrom auch in Schließrichtung auf das Verschlussglied wirken.Furthermore, the exhaust gas flow preferably exerts a pressure in the opening direction on at least the first closure member. As a result, the actuator and the control mechanism can be designed physically small, since only small opening forces are required. Alternatively, the exhaust gas flow can also act in the closing direction on the closure member.

In besonders bevorzugter Ausführung ist an zumindest dem ersten Schieberelement ein weiteres, zu dem ersten Verschlussglied bewegliches Verschlussglied vorgesehen, wobei die Verschlussglieder im Zuge einer Öffnungsbewegung des Schieberelements nacheinander eine ihnen zugeordnete Öffnung freigeben. Hierdurch kann eine im wesentlichen zweistufige Öffnung des Weges des ersten Schieberelements erreicht werden, wodurch mit einfachen Mitteln eine besonders flexible Einstellbarkeit des Abgasstromes gegeben ist. Insbesondere durch geeignete, beispielsweise konische Ausformung des Verschlussgliedes kann auch eine gute stufenlose Einstellbarkeit zusätzlich zu der Zweistufigkeit realisiert werden. Bei Druckbeaufschlagung eines der Verschlussglieder in Schließrichtung kann durch die zweistufige Öffnung die erforderliche Öffnungskraft klein gehalten werden, da nicht die gesamte Querschnittsfläche der Öffnung auf einmal freizugeben ist.In a particularly preferred embodiment, a further closing element which is movable relative to the first closure element is provided on at least the first slide element, the closure elements successively releasing an opening associated therewith in the course of an opening movement of the slide element. In this way, a substantially two-stage opening of the path of the first slide element can be achieved, which is given by simple means a particularly flexible adjustability of the exhaust gas flow. In particular, by suitable, for example, conical shape of the closure member and a good stepless adjustability can be realized in addition to the two-stage. When pressurizing one of the closure members in the closing direction can by the two-stage Opening the required opening force can be kept small because not the entire cross-sectional area of the opening to release at once.

In einer bevorzugten Ausführung umfasst die Steuermechanik zumindest einen drehbar gelagerten Hebel, um die Kraft des Aktuators geeignet auf die Schieberelemente umzulenken. Alternativ oder ergänzend kann die Steuermechanik auch eine drehbare Welle mit einem exzentrischen Element oder auch eine Kulissenscheibe umfassen. Diese mechanischen Elemente der Steuermechanik sind jeweils für sich oder auch in Kombination geeignet, einer ersten Stellung des Aktuators eine Öffnung des ersten Schieberelements und einer zweiten Stellung des Aktuators eine Öffnung des zweiten Schieberelements zuzuordnen. Je nach Auslegung der Steuermechanik besteht dabei eine hohe Flexibilität hinsichtlich der Wahl eines geeigneten Aktuators. So kann der Aktuator bevorzugt eine lineare, insbesondere hydraulische Antriebseinheit umfassen oder alternativ eine rotatorische, insbesondere elektromotorische Antriebseinheit. Grundsätzlich ist jeder Aktuator zur Kombination mit einer erfindungsgemäßen Vorrichtung geeignet. Bei geeigneter Auslegung der Steuermechanik kann die räumliche Anordnung des Aktuators so erfolgen, dass der Aktuator nur eine geringe Hitzebeaufschlagung durch das rückgeführte Abgas erfährt.In a preferred embodiment, the control mechanism comprises at least one rotatably mounted lever in order to deflect the force of the actuator suitably to the slide elements. Alternatively or additionally, the control mechanism may also comprise a rotatable shaft with an eccentric element or a link plate. These mechanical elements of the control mechanism are each suitable for themselves or in combination to associate an opening of the first slider element and a second position of the actuator, an opening of the second slider element a first position of the actuator. Depending on the design of the control mechanism, there is a high degree of flexibility with regard to the choice of a suitable actuator. Thus, the actuator may preferably comprise a linear, in particular hydraulic drive unit or alternatively a rotary, in particular electromotive drive unit. In principle, each actuator is suitable for combination with a device according to the invention. With a suitable design of the control mechanism, the spatial arrangement of the actuator can be made so that the actuator undergoes only a small heat application by the recirculated exhaust gas.

In einer bevorzugten Ausbildung der erfindungsgemäßen Vorrichtung ist zumindest das erste Verschlussglied tellerförmig ausgebildet. Dichtend abschließende Ventilteller benötigen nur wenig Bauraum und sind kostengünstig herstellbar.In a preferred embodiment of the device according to the invention, at least the first closure member is plate-shaped. Sealing final valve disc require little space and are inexpensive to produce.

In alternativer Ausführung ist zumindest das erste Verschlussglied konisch ausgebildet, wodurch bei geeigneter Ausformung eine besonders gute Einstellbarkeit der Öffnung zwischen den betreffenden Anschlüssen ermöglicht ist.In an alternative embodiment, at least the first closure member is conical, whereby a suitable shaping of a particularly good adjustability of the opening between the respective terminals is possible.

Weiterhin alternativ kann zumindest das erste Verschlussglied eine drehbare Stellklappe umfassen. Allgemein kann jedoch jede von den Temperaturanforderungen her geeignete Ausführung eines Ventilverschlusses vorgesehen sein.Further alternatively, at least the first closure member may comprise a rotatable damper. In general, however, any suitable from the temperature requirements forth suitable design of a valve closure can be provided.

Weitere Vorteile und Merkmale einer erfindungsgemäßen Vorrichtung ergeben sich aus den nachfolgend beschriebenen Ausführungsbeispielen sowie aus den abhängigen Ansprüchen.Further advantages and features of a device according to the invention will become apparent from the embodiments described below and from the dependent claims.

Nachfolgend werden zwei bevorzugte Ausführungsbeispiele einer erfindungsgemäßen Vorrichtung beschrieben und anhand der anliegenden Zeichnungen näher erläutert.

Fig. 1
zeigt eine schematische Schnittansicht eines ersten Ausführungsbeispiels einer erfindungsgemäßen Vorrichtung.
Fig. 2
zeigt eine schematische Schnittansicht eines zweiten Ausführungsbeispiels einer erfindungsgemäßen Vorrichtung.
Hereinafter, two preferred embodiments of a device according to the invention will be described and explained in more detail with reference to the accompanying drawings.
Fig. 1
shows a schematic sectional view of a first embodiment of a device according to the invention.
Fig. 2
shows a schematic sectional view of a second embodiment of a device according to the invention.

Die Vorrichtung gemäß dem ersten Ausführungsbeispiel nach Fig. 1 umfasst ein Gehäuse 1 mit einem ersten Anschluss 2, einem zweiten Anschluss 3 und einem dritten Anschluss 4. Der erste Anschluss 2 ist gemäß der Zeichnung zwar zweigeteilt, jedoch über eine geeignete, nicht dargestellte Verzweigung an denselben Abgaskanal zur Zuführung von Abgas eines Verbrennungsmotors angeschlossen. Die beiden gemäß der schematischen Schnittdarstellung getrennten Kammern 2a, 2b des Gehäuses 1 sind somit im wesentlichen mit dem gleichen Abgasdruck beaufschlagt.The device according to the first embodiment according to Fig. 1 comprises a housing 1 with a first port 2, a second port 3 and a third port 4. Although the first port 2 is divided into two, but connected via a suitable, not shown branch to the same exhaust passage for supplying exhaust gas of an internal combustion engine. The two separate according to the schematic sectional view chambers 2a, 2b of the housing 1 are thus subjected to substantially the same exhaust gas pressure.

Zwischen den Kammern 2a, 2b ist eine mit dem Anschluss 3 verbundene Kammer 3a und eine mit dem Anschluss 4 verbundene Kammer 4a vorgesehen, wobei eine Wand 5 die Kammern 3a, 4a voneinander trennt. Die Kammer 3a hat eine Verbindung 3b zu der Kammer 2a des Anschlusses 2 und eine Verbindung 3c zu der Kammer 2b des Anschlusses 2. Die Kammer 4a hat eine Verbindung 4b zu der Kammer 2a des Anschlusses 2 und eine Verbindung 4c zu der Kammer 2b des Anschlusses 2. Die Verbindungen 4b, 4c und die Verbindungen 3b, 3c liegen jeweils paarweise auf einer gemeinsamen Achse.Between the chambers 2 a, 2 b, a chamber 3 a connected to the connection 3 and a chamber 4 a connected to the connection 4 are provided, a wall 5 separating the chambers 3 a, 4 a from one another. The chamber 3a has a connection 3b to the chamber 2a of the terminal 2 and a connection 3c to the chamber 2b of the terminal 2. The chamber 4a has a connection 4b to the chamber 2a of the terminal 2 and a connection 4c to the chamber 2b of the terminal 2. The compounds 4b, 4c and the compounds 3b, 3c are each in pairs on a common axis.

Ein erstes Schieberelement 6 ist entlang der Verbindungsachse der Verbindungen 4b, 4c angeordnet. Es umfasst eine translatorisch in ihrer Längsrichtung bewegliche Schieberstange 6a, die an einem äußeren Durchbruch 6b des Gehäuses 1 im wesentlichen dichtend gleitgeführt ist. Einenends der Schieberstange 6a befindet sich ein mit der Ventilstange 6a verbundenes, als Ventilteller 6c ausgebildetes Verschlussglied, welches dichtend an der Verbindung 4c anliegen kann. Ein zweiter Ventilteller 6d ist auf der Schieberstange 6a gleitend gelagert und gegen den ersten Ventilteller 6c über ein Federelement 6g abgestützt. Andemends der Schieberstange 6a weist diese eine Gleitstück 6e auf, wobei eine Feder 6f zwischen der Wandung der Kammer 2a und dem Gleitstück 6e abgestützt ist.A first slider element 6 is arranged along the connection axis of the connections 4b, 4c. It comprises a translationally movable in its longitudinal direction slide rod 6a, which at an outer opening 6b the housing 1 is slidably guided in a substantially sealing. At one end of the pusher rod 6a is a closure member connected to the valve rod 6a and designed as a valve disk 6c, which can sealingly abut the connection 4c. A second valve disk 6d is slidably mounted on the slide rod 6a and supported against the first valve disk 6c via a spring element 6g. Andemends the pusher rod 6a, this has a slider 6e, wherein a spring 6f between the wall of the chamber 2a and the slider 6e is supported.

Die Feder 6f beaufschlagt gemäß der Darstellung nach Fig. 1 das erste Schieberelement 6 mit einer nach links gerichteten Kraft. In der dargestellten geschlossenen Position des ersten Schieberelements 6 wird der zweite Ventilteller 6d durch die Feder 6g dichtend auf die Verbindung 4b gedrückt, so dass die Feder 6g eine bezüglich der Abstützung gegen das Gehäuse 1 der Feder 6f entgegengesetzte Kraft ausübt. Die Feder 6f ist stärker ausgelegt als die Feder 6g, so dass die summierten Federkräfte beide Ventilteller 6c, 6d in geschlossener Position halten.The spring 6f acts according to the illustration Fig. 1 the first slider element 6 with a leftward force. In the illustrated closed position of the first slide element 6, the second valve plate 6d is pressed by the spring 6g sealingly on the connection 4b, so that the spring 6g exerts a force opposite to the support against the housing 1 of the spring 6f opposite force. The spring 6f is designed to be stronger than the spring 6g, so that the summed spring forces hold both valve disks 6c, 6d in the closed position.

Parallel zu dem ersten Schieberelement 6 ist ein zweites Schieberelement 7 angeordnet, das genauso wie das erste Schieberelement 6 aufgebaut ist, so dass seine Komponenten entsprechende Bezugszeichen 7a bis 7g tragen. Das zweite Schieberelement 7 ist auf der Achse der Verbindungen 3b, 3c angeordnet, so dass seine Ventilteller 7c, 7d zum Verschluss der Verbindungen 3c, 3b angeordnet sind. Im Unterschied zu dem ersten Schieberelement 6 ist das zweite Schieberelement 7 in einer vollständig geöffneten Position dargestellt, was sich an der nach rechts verschobenen Position der Schieberstange 7a erkennen lässt. Ersichtlich weist dabei der erste Ventilteller 7c des zweiten Schieberelements 7 einen größeren Abstand von der ihm zugeordneten Öffnung 3c auf als der zweite Ventilteller 7d von der ihm zugeordneten Öffnung 3b. Hieraus zeigt sich eine Zweistufigkeit des Öffnungsvorgangs, wobei bei einem Eindrücken des jeweiligen Schieberelements 6, 7 entgegen der Kraft der Feder 6f, 7f zunächst eine Öffnung des endseitigen, festen Ventiltellers 6c, 7c bewirkt. Im Zuge dieses ersten Öffnungsabschnitts entspannt sich die Feder 6g, 7g zwischen den Ventiltellern allmählich, bis der zweite Ventilteller 6d, 7d über einen nicht dargestellten Mitnehmer der Ventilstange 6a ebenfalls in Öffnungsrichtung zwangsbewegt wird. Durch diese Zweistufigkeit der Öffnung lässt sich eine besonders gut definierte Dosierung des rückgeführten Abgasstroms bewirken.Parallel to the first slide element 6, a second slide element 7 is arranged, which is constructed in the same way as the first slide element 6, so that its components carry corresponding reference numerals 7a to 7g. The second slide element 7 is arranged on the axis of the connections 3b, 3c so that its valve plates 7c, 7d are arranged to close off the connections 3c, 3b. In contrast to the first slide element 6, the second slide element 7 is shown in a fully open position, which can be seen at the shifted to the right position of the slide rod 7a. Obviously, the first valve disk 7c of the second slide element 7 has a greater distance from its associated opening 3c than the second valve disk 7d from its associated opening 3b. This shows a two-stage operation of the opening process, wherein upon depression of the respective slide element 6, 7 against the force of the spring 6f, 7f initially causes an opening of the end-side, fixed valve plate 6c, 7c. In the course of this first opening section, the spring 6g, 7g relaxes gradually between the valve plates until the second valve plate 6d, 7d via a driver, not shown, of the valve rod 6a is also forcibly moved in the opening direction. Due to this two-stage opening, a particularly well-defined metering of the recirculated exhaust gas flow can be effected.

Eine Steuermechanik 8 umfasst einen drehbar gelagerten Hebel 8a, wobei der Drehpunkt ortsfest gegenüber dem Gehäuse 1 ist.A control mechanism 8 comprises a rotatably mounted lever 8 a, wherein the pivot point is stationary relative to the housing 1.

Der drehbar gelagerte Hebel 8a ist so ausgeformt, dass bei seiner Bewegung in eine Richtung eine Gleitfläche 8b des Hebels 8a mit der Gleitnocke 6e des ersten Schieberelements zusammenwirkt und bei Auslenkung in Gegenrichtung mit der Gleitnocke 7e des zweiten Schieberelements 7. Das jeweils nicht betätigte Schieberelement gerät dabei jeweils außer Eingriff mit der Gleitfläche 8b des Hebels 8a, so dass dieses Schieberelement bedingt durch die zuvor beschriebenen Federkräfte geschlossen ist.The rotatably mounted lever 8a is formed so that when moving in one direction a sliding surface 8b of the lever 8a with the Gleitnocke 6e of the first slider element cooperates and deflection in the opposite direction with the Gleitnocke 7e of the second slide element 7. The respectively non-actuated slide element device in each case out of engagement with the sliding surface 8b of the lever 8a, so that this slide element is closed due to the spring forces described above.

Ein nicht dargestellter Aktuator ist in Form einer linearen hydraulischen Krafteinleitungseinheit ausgebildet. Mit Hilfe des Aktuators kann der Hebel 8a antreibbar in die eine oder die andere Richtung bewegt werden, wodurch entweder das erste Schieberelement 6 oder das zweite Schieberelement 7 in Öffnungsrichtung betätigt wird. Bei Betätigung des ersten Schieberelements 6 in Öffnungsrichtung werden die das Abgas zuführenden Kammern 2a, 2b über die Verbindungen 4b, 4c jeweils mit der Kammer 4a verbunden. Der Anschluss 4 führt dabei zu einem Abgaskühler des rückgeführten Abgases. Bei entsprechend entgegengesetzt gerichteter Betätigung des Hebels 8a wird das zweite Schieberelement 7 in Öffnungsrichtung betätigt, wobei die Kanäle 2a, 2b über die Verbindungen 3b, 3c mit dem Kanal 3a verbunden werden. Der Kanal 3a steht über den Anschluss 3 mit einer Bypass-Leitung in Verbindung, welche den Abgaskühler parallel umgeht.An unillustrated actuator is formed in the form of a linear hydraulic force introduction unit. With the aid of the actuator, the lever 8a can be drivably moved in one or the other direction, whereby either the first slide element 6 or the second slide element 7 is actuated in the opening direction. Upon actuation of the first slide element 6 in the opening direction, the chambers 2 a, 2 b supplying the exhaust gas are respectively connected to the chamber 4 a via the connections 4 b, 4 c. The connection 4 leads to an exhaust gas cooler of the recirculated exhaust gas. In correspondingly opposite operation of the lever 8a, the second slide element 7 is actuated in the opening direction, wherein the channels 2a, 2b are connected via the connections 3b, 3c with the channel 3a. The channel 3a is connected via the port 3 with a bypass line in communication, which bypasses the exhaust gas cooler in parallel.

Insgesamt kann somit durch eine eindimensionale Einstellung eines einzigen Aktuators sowohl eine Auswahl getroffen werden, ob ein Abgasstrom mit dem Abgaskühler oder der Bypass-Leitung verbunden wird als auch die Dosierung des rückgeführten Abgases gewährleistet werden. Die Ventilteller 4b, 4c, 3b, 3c können dabei zumindest teilweise konisch ausgeformt und gegebenenfalls in entsprechenden becherförmigen Ventilsitzen aufgenommen sein, um eine noch feinere Dosierung des rückgeführten Abgasstroms zu ermöglichen.Overall, therefore, a choice can be made by a one-dimensional adjustment of a single actuator, whether an exhaust gas flow is connected to the exhaust gas cooler or the bypass line and the metering of the recirculated exhaust gas can be ensured. The valve plates 4b, 4c, 3b, 3c can be at least partially conical and optionally accommodated in corresponding cup-shaped valve seats be to allow an even finer dosage of the recirculated exhaust gas stream.

Das zweite Ausführungsbeispiel gemäß Fig. 2 hat im Unterschied zum ersten Ausführungsbeispiel lediglich eine einzige zuführende Kammer 102a mit einem Anschluss 102. Die zuführende Kammer 102a ist über eine erste Verbindungsöffnung 103b mit einer Kammer 103a eines zweiten Anschlusses 103 verbunden und über eine Verbindungsöffnung 104b mit einer Kammer 104a eines dritten Anschlusses 104. Ähnlich wie beim ersten Ausführungsbeispiel ist ein erstes Schieberelement 106 und ein zweites Schieberelement 107 vorgesehen. Aufgrund der vereinfachten Ausgestaltung des Gehäuses 101 mit nur je einer Verbindung 103b, 104b zwischen der Zuleitung 102a und den beiden Ableitungen 103a, 104a weist jedes der Schieberelemente 106, 107 lediglich einen Ventilteller 106c, 107c auf, welcher jeweils am Ende einer entsprechenden Schieberstange 106a, 107a festgelegt ist. Ebenso wie im ersten Ausführungsbeispiel sind die beiden Schieberstangen 106a, 107a in Öffnungen 106b, 107b des Gehäuses 101 geführt und in Schließrichtung über Federn 106f, 107f kraftbeaufschlagt. Endseitig der Schieberstangen 106a, 107a befinden sich Gleitflächen 106e, 107e. Die Steuermechanik 108 des zweiten Ausführungsbeispiels umfasst eine drehbare Welle 108a, welche senkrecht zu den Schieberstangen 106a und 107a verläuft und jeweils auf Höhe der Gleitflächen 106e, 107e nockenartige exzentrische Elemente 108b, 108c aufweist. Die exzentrischen Elemente 108b, 108c sind im wesentlichen formgleich, aber um einen Drehwinkel von 180° versetzt zueinander auf der Welle 108a festgelegt.The second embodiment according to Fig. 2 has in contrast to the first embodiment, only a single feeding chamber 102a with a port 102. The feeding chamber 102a is connected via a first connection opening 103b with a chamber 103a of a second terminal 103 and via a connection opening 104b with a chamber 104a of a third terminal 104th Similar to the first embodiment, a first slider element 106 and a second slider element 107 are provided. Due to the simplified design of the housing 101 with only one connection 103b, 104b between the supply line 102a and the two outlets 103a, 104a, each of the slide elements 106, 107 has only one valve plate 106c, 107c, which in each case at the end of a corresponding slide rod 106a, 107a is fixed. As in the first embodiment, the two slide rods 106a, 107a are guided in openings 106b, 107b of the housing 101 and are subjected to a force in the closing direction via springs 106f, 107f. At the end of the slide rods 106a, 107a are sliding surfaces 106e, 107e. The control mechanism 108 of the second embodiment comprises a rotatable shaft 108a, which is perpendicular to the slide rods 106a and 107a and each at the height of the sliding surfaces 106e, 107e cam-like eccentric elements 108b, 108c. The eccentric elements 108b, 108c are substantially the same shape, but offset by a rotation angle of 180 ° to each other on the shaft 108a.

In der Drehstellung der Welle 108a gemäß Fig. 2 greift der eine Exzenter 108b an der ihm gegenüberliegenden Gleitfläche 107e so an, dass die Schieberstange 107a maximal in Öffnungsrichtung gegen die Federkraft eingedrückt ist und das Schieberelement 107 geöffnet ist. Der andere Exzenter 108b greift dagegen nicht an der Gleitfläche 106e des ersten Schieberelements 106 an, so dass das erste Schieberelement 106 bedingt durch die Federkraft geschlossen ist. Ersichtlich sind die Nocken 108b, 108c so steil ausgeformt, dass es eine Stellung der Drehwelle 108a gibt, bei der keines der Schieberelemente 106, 107 geöffnet ist. Aufgrund der Ausformung der Flanken der Nocken ist je nach Drehstellung auch eine nur teilweise Öffnung eines Schieberelements 106, 107 möglich, wobei das jeweils andere Schieberelement geschlossen ist.In the rotational position of the shaft 108a according to Fig. 2 engages an eccentric 108b on the opposite sliding surface 107e to him so that the slide rod 107a is pushed in the maximum direction in the opening direction against the spring force and the slide member 107 is opened. By contrast, the other eccentric 108b does not engage the sliding surface 106e of the first slider element 106, so that the first slider element 106 is closed due to the spring force. As can be seen, the cams 108b, 108c are formed so steeply that there is a position of the rotary shaft 108a in which none of the slide members 106, 107 is opened. Due to the shape of the Flanks of the cams is depending on the rotational position and a partial opening of a slide element 106, 107 possible, the other slide element is closed.

Ein nicht dargestellter Aktuator ist nach Art eines Elektromotors ausgeformt und gegebenenfalls über ein Übersetzungsgetriebe mit der Drehwelle 108a verbunden. Es kann sich aber auch um einen linearen Hydraulikzylinder handeln, der zum Beispiel über eine Zahnstange und ein Ritzel eine Linearbewegung in die Drehbewegung der Drehwelle 108a überträgt.An unillustrated actuator is formed in the manner of an electric motor and optionally connected via a transmission gear with the rotary shaft 108a. But it may also be a linear hydraulic cylinder, which transmits, for example via a rack and a pinion linear motion in the rotational movement of the rotary shaft 108a.

Es versteht sich, dass die Komponenten, insbesondere die Steuermechaniken 8, 108, des ersten und des zweiten Ausführungsbeispiels gegeneinander ausgetauscht sein können. So kann etwa nur eines der Schieberelemente zweistufig ausgelegt sein. Ebenso kann die Anordnung der Verschlussglieder je nach Anordnung von dem Abgasdruck in Schließrichtung oder in Öffnungsrichtung beaufschlagt sein.It is understood that the components, in particular the control mechanisms 8, 108, of the first and the second embodiment can be interchanged. For example, only one of the slide elements can be designed in two stages. Likewise, the arrangement of the closure members may be acted upon by the exhaust gas pressure in the closing direction or in the opening direction, depending on the arrangement.

Claims (10)

  1. A device for controlling an exhaust gas stream, comprising
    a housing (1, 101) with at least one first, one second and one third port (2, 3, 4, 102, 103, 104) for connecting to a first, a second and a third exhaust gas duct for conducting exhaust gases of an internal combustion engine,
    a first slide element (6, 106), including a movable first slide rod (6a, 106a) and a first closure element (6c, 106c) disposed thereon,
    a second slide element (7, 107), including a movable second slide rod (7a, 107a) and a second closure element (7c, 107c) disposed thereon, and
    an actuator for power-assisted actuation of the device,
    wherein a connection (4c, 104b) between the first and the second port is configured to be closed off in an adjustable fashion by the first closure element (6, 106),
    wherein a connection (3c, 103b) between the first and the third port is configured to be closed off in an adjustable fashion by the second closure element (7c, 107c),
    wherein a control mechanism (8, 108) connected to the actuator is provided, wherein the first slide element (6, 106) and the second slide element (7, 107) are configured to be adjusted by the control mechanism (8, 108),
    characterised in that
    the control mechanism (8) comprises at least one of a rotatably mounted lever (8a), a rotatable shaft (108a) with an eccentric element (108b, 108c) and a slotted guide disk.
  2. The device as claimed in claim 1, characterised in that any one of the at least three ports (2, 3, 4, 102, 103, 104) is connected to an exhaust line, to an exhaust gas cooler and to an exhaust gas line of the exhaust gas cooler, respectively.
  3. The device as claimed in claim 1 or 2, characterised in that at least the first slide element (6, 106) is adapted to be acted on with force in a closing direction by a spring.
  4. The device as claimed in any one of the preceding claims, characterised in that the exhaust gas stream exerts a pressure in an opening direction on at least the first closure element (106c).
  5. The device as claimed in any one of the preceding claims, characterised in that a further closure element (6d) which is movable with respect to the first closure element (6c) is provided on at least the first slide element (6), wherein the closure elements (6c, 6d), during the course of an opening movement of the slide element (6), release in succession openings (4b, 4c) assigned to said closure elements.
  6. The device as claimed in any one of the preceding claims, characterised in that the actuator comprises a linear, in particular hydraulic, drive unit.
  7. The device as claimed in any one of the preceding claims, characterised in that the actuator comprises a rotary, in particular electromotive, drive unit.
  8. The device as claimed in any one of the preceding claims, characterised in that at least the first closure element (6c) is of plate-shaped design.
  9. The device as claimed in any one of claims 1 to 8, characterised in that at least the first closure element is of conical design.
  10. The device as claimed in any one of claims 1 to 9, characterised in that at least the first closure element comprises a rotatable actuating flap.
EP06791380.6A 2005-09-08 2006-09-07 Device for controlling an exhaust gas stream Not-in-force EP1926907B1 (en)

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DE200510044089 DE102005044089A1 (en) 2005-09-08 2005-09-08 Device for controlling an exhaust gas flow
PCT/DE2006/001611 WO2007028381A2 (en) 2005-09-08 2006-09-07 Device for controlling an exhaust gas stream

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EP1926907B1 true EP1926907B1 (en) 2016-08-31

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EP (1) EP1926907B1 (en)
JP (1) JP2009507172A (en)
CN (1) CN101287901A (en)
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US7938106B2 (en) 2011-05-10
EP1926907A2 (en) 2008-06-04
JP2009507172A (en) 2009-02-19
CN101287901A (en) 2008-10-15
DE102005044089A1 (en) 2007-03-15
US20080250787A1 (en) 2008-10-16
WO2007028381A3 (en) 2007-05-10
WO2007028381A2 (en) 2007-03-15

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