EP2504555B1 - Valve device for an internal combustion engine - Google Patents

Valve device for an internal combustion engine Download PDF

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Publication number
EP2504555B1
EP2504555B1 EP10779756.5A EP10779756A EP2504555B1 EP 2504555 B1 EP2504555 B1 EP 2504555B1 EP 10779756 A EP10779756 A EP 10779756A EP 2504555 B1 EP2504555 B1 EP 2504555B1
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EP
European Patent Office
Prior art keywords
valve device
combustion engine
internal combustion
magnet
coupling element
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Application number
EP10779756.5A
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German (de)
French (fr)
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EP2504555A1 (en
Inventor
Michael Sanders
Martin Nowak
Sven Nigrin
Andreas Köster
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Pierburg GmbH
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Pierburg GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/45—Sensors specially adapted for EGR systems
    • F02M26/48—EGR valve position sensors
    • 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
    • F02M26/54—Rotary actuators, e.g. step motors
    • 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
    • F02M26/11—Manufacture or assembly of EGR systems; Materials or coatings specially adapted for EGR systems
    • 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
    • F02M26/74—Protection from damage, e.g. shielding means

Definitions

  • the invention relates to a valve device for an internal combustion engine with a housing in which a drive unit which generates a torque, a transmission unit, a coupling element and a translationally movable adjusting element, which is fixedly connected to the coupling element, are arranged.
  • valve devices are used for example as exhaust gas recirculation valves.
  • sensor systems for bearing feedback are usually arranged in the area of the gear unit in order to avoid excessive thermal loading of the magnet or the sensor, since this frequently leads to demagnetization of permanent magnets, which in turn results in inaccuracies in the position feedback.
  • WO 2005/021954 A1 discloses an electric motor operated exhaust gas recirculation valve, in which a hollow cylindrical body is driven by a gear with a link in which a connected to a valve rod bolt runs. By turning the gate, the bolt and thus the valve stem is raised or lowered.
  • a magnet is mounted on the end of the valve stem which cooperates with a non-contact sensor mounted on a circuit board secured to a wall of the housing.
  • valve rod is actuated via a transmission.
  • a transmission acts on the valve rod formed teeth in the form of a rack.
  • a Manget is positioned for positioning on the end of the valve stem.
  • the senor is arranged parallel to the direction of movement of the carrier element.
  • a cost-effective, axially magnetized permanent magnet can be used.
  • the senor is mounted on the ends of a stamped grid by welding, the opposite ends of the stamped grid serve as connection pins for a connector. Consequently
  • the sensor can be mounted in the housing and electrically contacted.
  • the stamped grid are encapsulated with, so that a release of the electrical contact is prevented.
  • Other connectors and the like are completely eliminated, which in turn ensures a reliable electrical connection over the entire life.
  • the stamped grid can advantageously have contact elements for connecting the drive unit, whose opposite ends serve as connection pins for the connector.
  • the entire stamped grid can be produced in one process step and the encapsulation of its position in the housing can be ensured. In this case, the contact points for the electric motor are generated without further assembly.
  • electronic components to improve the electromagnetic compatibility are attached to the stamped grid, which can also be encapsulated with. So can be dispensed with further manufacturing steps here, while a reliable attachment is ensured.
  • a heat-insulating element is arranged between the magnet and the adjusting element.
  • this element takes place a thermal decoupling of the heat-loaded adjusting element of the magnet, which significantly increases the life of the magnet and the accuracy of the measurements.
  • either a separate element between the coupling element and the carrier element can be arranged or one of these parts can be made in one piece with the coupling element or the carrier element.
  • a ceramic element serves as a heat-insulating element.
  • Such an element is easy to fasten on the adjusting element and on the coupling element or, as already mentioned, in one piece with these. It is subject to good thermal insulation low wear and is thermally highly resilient.
  • the carrier element is formed integrally with the coupling element and the heat-insulating element and the magnet are integrated in the coupling element.
  • Such an embodiment is particularly cost feasible.
  • valve device with a bearing feedback that ensures accurate measurements of the position of the adjusting over a long life even at high thermal loads.
  • the magnetic sensor unit is easy to integrate in the structure and inexpensive to produce.
  • valve device An embodiment of a valve device according to the invention is shown in the figures and will be described below using the example of an exhaust gas recirculation valve.
  • FIG. 1 shows a detail of a side view of the valve device according to the invention in a sectional view.
  • FIG. 2 shows in perspective view a stamped grid with sensor of the valve device FIG. 1 ,
  • valve device shows a section of an exhaust gas recirculation valve.
  • This has a drive unit 2 in the form of an electric motor and a transmission unit 4, which is driven by the drive unit 2 and their movement over a Coupling element 6 is transmitted to an adjusting element 8, which is the valve rod of the exhaust gas recirculation valve in the present embodiment.
  • the drive unit 2, the gear unit 4 and the coupling element 6 and the adjusting element 8 are arranged in a common multi-part housing 10, which consists of a cup-shaped housing part 12 surrounding the drive unit 2, a housing part 14 accommodating the gear unit 4 and a cover part closing the housing part 14 16 exists.
  • a first gear 20 of the gear unit 4 is arranged rotatably, by means of which the following gears are driven so that a desired reduction is achieved.
  • a in the power flow of the gear unit 4 last gear 22 is designed as a gear segment, the axis of rotation 24 is fixed in the housing part 14.
  • an axis 26 is additionally attached, which is moved concentrically about the rotation axis 24 on a circular path upon actuation of the drive unit 2.
  • a roller 28 is fixed, which runs in a slot 30 of the coupling element 6.
  • the coupling element 6 is fixedly connected to the adjusting element 8, which in turn is mounted and guided in the housing 10 such that it can only perform a translatory lifting movement. Accordingly, the circular movement of the roller 28 is converted by the coupling element 6 in a translational movement of the adjusting element 8.
  • a helical spring 32 is arranged around a side facing away from the adjustment 8 side of the gear 22, which serves as a return torsion spring and in case of failure of the drive unit 2 moves the valve in its closed position.
  • a leg 34 of the spring 32 is secured to the gear 22 and one at the other end of the spring 32nd arranged, not visible in the figure leg attached to the housing part 14.
  • a support member 36 is attached to the coupling element 6, which carries out the lifting movement of the adjusting element 8 with the coupling element 6.
  • the carrier element 36 has a receptacle 38, in which a permanent magnet 40 is arranged.
  • the permanent magnet 40 communicates with a non-contact sensor 42, which is surrounded by the plastic of the housing part 14 and is arranged parallel to the axis of movement of the carrier element 36 next to this.
  • the magnet 40 may be axially magnetized, for example, so that the sensor 42 detects the angle of movement of the magnetic field acting on it, which is a measure of the position of the adjusting element 8.
  • a heat-insulating element 44 in the form of a ceramic element is arranged between the magnet 40 and the coupling element 6.
  • This ceramic element 44 could also be arranged between the coupling element 6 and the carrier element 36. It is essential that the heat of the exhaust gas, which acts on the adjusting element 8, is shielded by the heat-insulating member 44 relative to the magnet 40, so that it is exposed to a significantly reduced thermal stress.
  • connection of the sensor 42 in the housing becomes clear.
  • the sensor 42 is welded with its contact elements 46 directly to a stamped grid 48, which additionally has contact elements 50 for contacting the electric motor 2.
  • the respective opposite ends of the punched grid 48 which also in FIG. 1 to are recognized, serve as connection pins 52 for a connector for controlling the drive unit. 2
  • FIG. 2 shown unit The entire in FIG. 2 shown unit is inserted in the manufacture of the valve device in an injection mold, so that the sensor 42 and the lead frame 48 with the exception of the connection pins 52 and the motor contact elements 50 are molded with plastic. Thus, a release of the sensor contacts 46 can be reliably avoided, which are welded to the punched grid 48.
  • This valve device is characterized by a high accuracy in the bearing feedback by exact non-changing positioning of the sensor to the magnet, by arranging the magnet on the element to be detected itself and by the thermal relief of the magnet. This ensures correct position detection over a long service life.
  • the structure is simple and the production or assembly has very few possible sources of error.
  • the coupling element and the carrier element can also be produced in one piece, or receive the carrier element as a ceramic insulating part of the magnet.
  • the insulating part could be arranged as a separate part between the coupling element and the carrier element.
  • the shape of the gear or of the elements by which the rotational movement is converted into a translatory motion is not limitative of the present invention.

Description

Die Erfindung betrifft eine Ventilvorrichtung für eine Verbrennungskraftmaschine mit einem Gehäuse, in dem eine Antriebseinheit, die ein Drehmoment erzeugt, eine Getriebeeinheit, ein Kopplungselement und ein translatorisch bewegbares Verstellelement, welches mit dem Kopplungselement fest verbunden ist, angeordnet sind.The invention relates to a valve device for an internal combustion engine with a housing in which a drive unit which generates a torque, a transmission unit, a coupling element and a translationally movable adjusting element, which is fixedly connected to the coupling element, are arranged.

Derartige Ventilvorrichtungen werden beispielsweise als Abgasrückführventile verwendet. Sensorsysteme zur Lagerückmeldung werden bei diesen Anwendungen üblicherweise im Bereich der Getriebeeinheit angeordnet, um eine zu hohe thermische Belastung des Magneten oder des Sensors zu vermeiden, da dies häufig zu einer Entmagnetisierung von Permanentmagneten führt, die wiederum Ungenauigkeiten bei der Lagerückmeldung zur Folge hat.Such valve devices are used for example as exhaust gas recirculation valves. In these applications, sensor systems for bearing feedback are usually arranged in the area of the gear unit in order to avoid excessive thermal loading of the magnet or the sensor, since this frequently leads to demagnetization of permanent magnets, which in turn results in inaccuracies in the position feedback.

So ist aus der EP 1 126 156 A2 ein Abgasrückführventil bekannt, bei dem die Lagerückmeldung über ein Potentiometer erfolgt. Hierzu sind an der Ventilstange sich mit der Ventilstange bewegende Schleifkontakte angeordnet. Diese neigen jedoch im Abgasbereich zur Verschmutzung und daraus folgend zu ungenauen Ergebnissen bei der Lagerückmeldung.So is out of the EP 1 126 156 A2 an exhaust gas recirculation valve is known in which the position feedback via a potentiometer. For this purpose, moving sliding contacts are arranged on the valve rod with the valve rod. However, these tend in the exhaust gas to pollution and consequent imprecise results in the bearing feedback.

Zusätzlich ist aus der EP 1 091 112 B1 ein Abgasrückführventil mit einem berührungslos arbeitenden Hall-Sensor bekannt. Die genaue Anordnung des Sensors und des Magneten gehen aus dieser Schrift jedoch nicht hervor.In addition is from the EP 1 091 112 B1 an exhaust gas recirculation valve with a non-contact Hall sensor known. However, the exact arrangement of the sensor and the magnet are not apparent from this document.

Aus der DE 102 01 141 A1 ist eine Stellvorrichtung mit einem Getriebe bekannt, in dem ein Hall-Sensor integriert ist, der mit einem auf einer Abtriebswelle angeordneten Magneten zusammenwirkt. Bei anschließender Umsetzung der rotatorischen Bewegung in eine translatorische Hubbewegung würde jedoch nicht das zu detektierende Glied erkannt, so dass Fehler durch Spiel zwischen den einzelnen Übersetzungsstufen auftreten.From the DE 102 01 141 A1 is an adjusting device with a transmission known, in which a Hall sensor is integrated, which cooperates with a arranged on an output shaft magnet. In the subsequent implementation of the rotational movement in a translational lifting movement, however, the member to be detected would not be detected, so that errors occur through play between the individual gear ratios.

Des Weiteren ist es beispielsweise aus der DE 198 48 081 A1 bekannt, einen Sensor auf einem Stanzkamm anzuordnen und diesen mit Kunststoff zu umspritzen.Furthermore, it is for example from the DE 198 48 081 A1 known to arrange a sensor on a punching comb and to encase it with plastic.

Zusätzlich wird in der WO 2005/021954 A1 ein elektromotorisch betriebenes Abgasrückführventil offenbart, bei dem über ein Getriebe ein hohlzylindrischer Körper mit einer Kulisse angetrieben wird, in welcher ein mit einer Ventilstange verbundener Bolzen läuft. Durch Drehung der Kulisse wird der Bolzen und damit die Ventilstange angehoben oder abgesenkt. Zur Lagerückmeldung ist auf dem Ende der Ventilstange ein Magnet befestigt, der mit einem berührungslosen Sensor zusammenwirkt, der auf einer Platine befestigt ist, die an einer Wand des Gehäuses befestigt ist.In addition, in the WO 2005/021954 A1 discloses an electric motor operated exhaust gas recirculation valve, in which a hollow cylindrical body is driven by a gear with a link in which a connected to a valve rod bolt runs. By turning the gate, the bolt and thus the valve stem is raised or lowered. For bearing feedback, a magnet is mounted on the end of the valve stem which cooperates with a non-contact sensor mounted on a circuit board secured to a wall of the housing.

Auch ist aus der DE 101 12 033 A1 ein Ventil bekannt, dessen Ventilstange über ein Getriebe betätigt wird. Als letztes Glied dieses Getriebes wirkt eine an der Ventilstange ausgebildete Verzahnung in Form einer Zahnstange. Auch bei diesem Ventil ist auf dem Ende der Ventilstange ein Manget zur Positionierung angeordnet.Also is from the DE 101 12 033 A1 a valve known, the valve rod is actuated via a transmission. As the last link of this transmission acts on the valve rod formed teeth in the form of a rack. Also in this valve, a Manget is positioned for positioning on the end of the valve stem.

In beiden Ausführungen ist der Magnet hohen thermischen Belastungen ausgesetzt, so dass dessen Lebensdauer eingeschränkt ist.In both versions, the magnet is exposed to high thermal loads, so that its life is limited.

Eine Anordnung eines Magnet-Sensorsystems zur direkten Lagerückmeldung an einem Hubventil, insbesondere im Abgasbereich, welches eine lange Lebensdauer aufweist und leicht zu montieren ist, ist nicht bekannt.An arrangement of a magnetic sensor system for direct bearing feedback on a globe valve, in particular in the exhaust area, which has a long life and is easy to assemble, is not known.

Somit ergibt sich die Aufgabe, eine Ventilvorrichtung zu schaffen, mit der eine exakte Lagerückmeldung auch bei thermischer Belastung über einen langen Zeitraum exakt und zuverlässig ermöglicht wird, ohne dass im Vergleich zu bekannten Ausführungen zusätzlicher Bauraum verwendet werden muss oder ein erhöhter Montageaufwand entsteht.Thus, the task results to provide a valve device, with the exact bearing feedback is made possible even under thermal stress over a long period of time exactly and reliably without having to be used in comparison to known designs additional space or an increased installation effort arises.

Diese Aufgabe wird dadurch gelöst, dass starr am Kopplungselement ein Trägerelement angeordnet ist, an dem ein Magnet befestigt ist, der mit einem berührungslosen Sensor zusammenwirkt, welcher im Gehäuse eingespritzt ist. Somit werden das Kopplungselement und das Trägerelement in gleicher Weise translatorisch mit dem Verstellelement bewegt, so dass die Bewegung des Magneten der Bewegung des Verstellelementes entspricht. Dennoch ist eine thermische Entkopplung des Magneten vom gegebenenfalls thermisch hoch belasteten Verstellelement gegeben. Durch das Einspritzen des Sensors in das Gehäuse wird dieser vor Umgebungseinflüssen geschützt. Gleichzeitig wird ein Lösen des Sensors verhindert und seine feste Lage über die gesamte Lebensdauer sichergestellt.This object is achieved in that rigidly mounted on the coupling element is a carrier element to which a magnet is fastened, which cooperates with a non-contact sensor which is injected in the housing. Thus, the coupling element and the carrier element are moved in the same way translationally with the adjusting element, so that the movement of the magnet corresponds to the movement of the adjusting element. Nevertheless, a thermal decoupling of the magnet is given by the optionally thermally highly loaded adjustment. By injecting the sensor into the housing, it is protected from environmental influences. At the same time a release of the sensor is prevented and its solid position ensured over the entire life.

In einer bevorzugten Ausführung ist der Sensor parallel zur Bewegungsrichtung des Trägerelementes angeordnet. So kann ein kostengünstiger, axial magnetisierter Permanentmagnet verwendet werden.In a preferred embodiment, the sensor is arranged parallel to the direction of movement of the carrier element. Thus, a cost-effective, axially magnetized permanent magnet can be used.

Vorzugsweise ist der Sensor auf den Enden eines Stanzgitters durch Schweißen befestigt, wobei die gegenüberliegenden Enden des Stanzgitters als Anschlusspins für einen Anschlussstecker dienen. Somit kann der Sensor ohne die Verwendung weiterer Bauteile, wie beispielsweise einer Platine, im Gehäuse befestigt und elektrisch kontaktiert werden. Die Stanzgitter werden dabei mit umspritzt, so dass auch ein Lösen der elektrischen Kontaktierung verhindert wird. Weitere Steckverbindungen und ähnliches entfallen vollständig, wodurch wiederum über die gesamte Lebensdauer eine zuverlässige elektrische Verbindung sichergestellt wird.Preferably, the sensor is mounted on the ends of a stamped grid by welding, the opposite ends of the stamped grid serve as connection pins for a connector. Consequently For example, without the use of other components such as a circuit board, the sensor can be mounted in the housing and electrically contacted. The stamped grid are encapsulated with, so that a release of the electrical contact is prevented. Other connectors and the like are completely eliminated, which in turn ensures a reliable electrical connection over the entire life.

Weiterhin kann das Stanzgitter vorteilhaft Kontaktelemente zum Anschluss der Antriebseinheit aufweisen, deren entgegengesetzte Enden als Anschlusspins für den Anschlussstecker dienen. Das gesamte Stanzgitter kann in einem Verfahrensschritt hergestellt und beim Umspritzen dessen Lage im Gehäuse sichergestellt werden. Dabei werden ohne weitere Montage auch die Kontaktstellen für den Elektromotor erzeugt.Furthermore, the stamped grid can advantageously have contact elements for connecting the drive unit, whose opposite ends serve as connection pins for the connector. The entire stamped grid can be produced in one process step and the encapsulation of its position in the housing can be ensured. In this case, the contact points for the electric motor are generated without further assembly.

In einer weiterführenden Ausführung sind auf dem Stanzgitter Elektronikbauteile zur Verbesserung der elektromagnetischen Verträglichkeit befestigt, welche ebenfalls mit umspritzt werden können. So kann auch hier auf weitere Fertigungsschritte verzichtet werden, während eine zuverlässige Befestigung sichergestellt ist.In a further embodiment, electronic components to improve the electromagnetic compatibility are attached to the stamped grid, which can also be encapsulated with. So can be dispensed with further manufacturing steps here, while a reliable attachment is ensured.

Besonders bevorzugt ist eine Ausführung, bei der zwischen dem Magneten und dem Verstellelement ein wärmeisolierendes Element angeordnet ist. Durch dieses Element findet eine thermische Entkopplung des wärmebelasteten Verstellelements vom Magneten statt, was die Lebensdauer des Magneten und die Genauigkeit der Messungen deutlich erhöht. Dabei kann entweder ein separates Element zwischen dem Kopplungselement und dem Trägerelement angeordnet werden oder eines dieser Teile einstückig mit dem Kopplungselement oder dem Trägerelement hergestellt werden.Particularly preferred is an embodiment in which a heat-insulating element is arranged between the magnet and the adjusting element. By this element takes place a thermal decoupling of the heat-loaded adjusting element of the magnet, which significantly increases the life of the magnet and the accuracy of the measurements. In this case, either a separate element between the coupling element and the carrier element can be arranged or one of these parts can be made in one piece with the coupling element or the carrier element.

In einer hierzu weiterführenden Ausführung dient ein keramisches Element als wärmeisolierendes Element. Ein solches Element ist einfach am Verstellelement und am Kopplungselement zu befestigen oder, wie bereits erwähnt, einstückig mit diesen herzustellen. Es unterliegt bei guter Wärmeisolierung einem geringen Verschleiß und ist thermisch hoch belastbar.In a further embodiment, a ceramic element serves as a heat-insulating element. Such an element is easy to fasten on the adjusting element and on the coupling element or, as already mentioned, in one piece with these. It is subject to good thermal insulation low wear and is thermally highly resilient.

So ist es bevorzugt, wenn das Trägerelement einstückig mit dem Kopplungselement ausgebildet ist und das wärmeisolierende Element und der Magnet im Kopplungselement integriert sind. Eine solche Ausführung ist besonders kostengünstig realisierbar.Thus, it is preferred if the carrier element is formed integrally with the coupling element and the heat-insulating element and the magnet are integrated in the coupling element. Such an embodiment is particularly cost feasible.

Es wird somit eine Ventilvorrichtung mit einer Lagerückmeldung geschaffen, die über eine lange Lebensdauer auch bei hohen thermischen Belastungen exakte Messungen der Position des Verstellelementes sicherstellt. Die Magnet-Sensoreinheit ist einfach im Aufbau zu integrieren und kostengünstig herstellbar.It is thus provided a valve device with a bearing feedback that ensures accurate measurements of the position of the adjusting over a long life even at high thermal loads. The magnetic sensor unit is easy to integrate in the structure and inexpensive to produce.

Ein Ausführungsbeispiel einer erfindungsgemäßen Ventilvorrichtung ist in den Figuren dargestellt und wird am Beispiel eines Abgasrückführventils nachfolgend beschrieben.An embodiment of a valve device according to the invention is shown in the figures and will be described below using the example of an exhaust gas recirculation valve.

Die Figur 1 zeigt einen Ausschnitt einer Seitenansicht der erfindungsgemäßen Ventilvorrichtung in geschnittener Darstellung.The FIG. 1 shows a detail of a side view of the valve device according to the invention in a sectional view.

Figur 2 zeigt in perspektivischer Darstellung ein Stanzgitter mit Sensor der Ventilvorrichtung aus Figur 1. FIG. 2 shows in perspective view a stamped grid with sensor of the valve device FIG. 1 ,

Die in Figur 1 dargestellte Ventilvorrichtung zeigt einen Ausschnitt eines Abgasrückführventils. Dieses weist eine Antriebseinheit 2 in Form eines Elektromotors sowie eine Getriebeeinheit 4 auf, die über die Antriebseinheit 2 angetrieben wird und deren Bewegung über ein Kopplungselement 6 auf ein Verstellelement 8 übertragen wird, welches im vorliegenden Ausführungsbeispiel die Ventilstange des Abgasrückführventils ist.In the FIG. 1 shown valve device shows a section of an exhaust gas recirculation valve. This has a drive unit 2 in the form of an electric motor and a transmission unit 4, which is driven by the drive unit 2 and their movement over a Coupling element 6 is transmitted to an adjusting element 8, which is the valve rod of the exhaust gas recirculation valve in the present embodiment.

Die Antriebseinheit 2, die Getriebeeinheit 4 sowie das Kopplungselement 6 und das Verstellelement 8 sind in einem gemeinsamen mehrteiligen Gehäuse 10 angeordnet, welches aus einem topfförmigen, die Antriebseinheit 2 umgebenden Gehäuseteil 12, einem die Getriebeeinheit 4 aufnehmenden Gehäuseteil 14 sowie einem das Gehäuseteil 14 verschließenden Deckelteil 16 besteht.The drive unit 2, the gear unit 4 and the coupling element 6 and the adjusting element 8 are arranged in a common multi-part housing 10, which consists of a cup-shaped housing part 12 surrounding the drive unit 2, a housing part 14 accommodating the gear unit 4 and a cover part closing the housing part 14 16 exists.

Auf einer Antriebswelle 18 der Antriebseinheit 2 ist ein erstes Zahnrad 20 der Getriebeeinheit 4 drehfest angeordnet, mittels dessen folgende Zahnräder derart angetrieben werden, dass eine gewünschte Untersetzung erreicht wird. Ein im Kraftfluss der Getriebeeinheit 4 letztes Zahnrad 22 ist als Zahnradsegment ausgeführt, dessen Drehachse 24 im Gehäuseteil 14 befestigt ist. Am Zahnrad 22 ist zusätzlich eine Achse 26 befestigt, die konzentrisch um die Drehachse 24 auf einer Kreisbahn bei Betätigung der Antriebseinheit 2 bewegt wird. Auf dem zum Zahnrad 22 entgegengesetzten Ende der Achse 26 ist eine Rolle 28 befestigt, welches in einer Kulisse 30 des Kopplungselementes 6 läuft. Das Kopplungselement 6 ist fest mit dem Verstellelement 8 verbunden, welches wiederum im Gehäuse 10 derart gelagert und geführt ist, dass es lediglich eine translatorische Hubbewegung ausführen kann. Entsprechend wird die Kreisbewegung der Rolle 28 durch das Kopplungselement 6 in eine translatorische Bewegung des Verstellelementes 8 umgewandelt.On a drive shaft 18 of the drive unit 2, a first gear 20 of the gear unit 4 is arranged rotatably, by means of which the following gears are driven so that a desired reduction is achieved. A in the power flow of the gear unit 4 last gear 22 is designed as a gear segment, the axis of rotation 24 is fixed in the housing part 14. On the gear 22, an axis 26 is additionally attached, which is moved concentrically about the rotation axis 24 on a circular path upon actuation of the drive unit 2. On the opposite end to the gear 22 end of the axis 26, a roller 28 is fixed, which runs in a slot 30 of the coupling element 6. The coupling element 6 is fixedly connected to the adjusting element 8, which in turn is mounted and guided in the housing 10 such that it can only perform a translatory lifting movement. Accordingly, the circular movement of the roller 28 is converted by the coupling element 6 in a translational movement of the adjusting element 8.

Zusätzlich ist um eine vom Verstellelement 8 abgewandten Seite des Zahnrades 22 eine Schraubenfeder 32 angeordnet, welche als Rückdrehfeder dient und bei Ausfall der Antriebseinheit 2 das Ventil in seine Schließstellung bewegt. Hierzu ist ein Schenkel 34 der Feder 32 am Zahnrad 22 befestigt und ein am anderen Ende der Feder 32 angeordneter, in der Figur nicht sichtbarer Schenkel am Gehäuseteil 14 befestigt.In addition, a helical spring 32 is arranged around a side facing away from the adjustment 8 side of the gear 22, which serves as a return torsion spring and in case of failure of the drive unit 2 moves the valve in its closed position. For this purpose, a leg 34 of the spring 32 is secured to the gear 22 and one at the other end of the spring 32nd arranged, not visible in the figure leg attached to the housing part 14.

Am vom Verstellelement 8 abgewandten Ende des Kopplungselementes 6 ist am Kopplungselement 6 ein Trägerelement 36 befestigt, welches mit dem Kopplungselement 6 die Hubbewegung des Verstellelementes 8 vollzieht. Am zum Kopplungselement 6 entgegengesetzten Ende weist das Trägerelement 36 eine Aufnahme 38 auf, in welcher ein Permanentmagnet 40 angeordnet ist.At the end facing away from the adjusting element 8 of the coupling element 6, a support member 36 is attached to the coupling element 6, which carries out the lifting movement of the adjusting element 8 with the coupling element 6. At the end opposite to the coupling element 6, the carrier element 36 has a receptacle 38, in which a permanent magnet 40 is arranged.

Der Permanentmagnet 40 kommuniziert mit einem berührungslosen Sensor 42, der vom Kunststoff des Gehäuseteils 14 umgeben ist und parallel zur Bewegungsachse des Trägerelementes 36 neben diesem angeordnet ist. Der Magnet 40 kann beispielsweise axial magnetisiert sein, so dass der Sensor 42 den sich mit Bewegung ändernden Winkel des auf ihn wirkenden magnetischen Feldes detektiert, welches ein Maß für die Stellung des Verstellelementes 8 ist.The permanent magnet 40 communicates with a non-contact sensor 42, which is surrounded by the plastic of the housing part 14 and is arranged parallel to the axis of movement of the carrier element 36 next to this. The magnet 40 may be axially magnetized, for example, so that the sensor 42 detects the angle of movement of the magnetic field acting on it, which is a measure of the position of the adjusting element 8.

Im Trägerelement 36 ist zwischen dem Magneten 40 und dem Kopplungselement 6 ein wärmeisolierendes Element 44 in Form eines Keramikelementes angeordnet. Dieses Keramikelement 44 könnte auch zwischen dem Kopplungselement 6 und dem Trägerelement 36 angeordnet werden. Wesentlich ist, dass die Wärme des Abgases, welche auf das Verstellelement 8 wirkt, durch das wärmeisolierende Element 44 gegenüber dem Magneten 40 abgeschirmt wird, so dass dieser einer deutlich verringerten thermischen Belastung ausgesetzt ist.In the carrier element 36, a heat-insulating element 44 in the form of a ceramic element is arranged between the magnet 40 and the coupling element 6. This ceramic element 44 could also be arranged between the coupling element 6 and the carrier element 36. It is essential that the heat of the exhaust gas, which acts on the adjusting element 8, is shielded by the heat-insulating member 44 relative to the magnet 40, so that it is exposed to a significantly reduced thermal stress.

Aus der Figur 2 wird die Anbindung des Sensors 42 im Gehäuse deutlich. Der Sensor 42 ist mit seinen Kontaktelementen 46 direkt auf ein Stanzgitter 48 aufgeschweißt, welches zusätzlich Kontaktelemente 50 zur Kontaktierung des Elektromotors 2 aufweist. Die jeweils entgegengesetzten Enden des Stanzgitters 48, welche auch in Figur 1 zu erkennen sind, dienen als Anschlusspins 52 für einen Anschlussstecker zur Ansteuerung der Antriebseinheit 2.From the FIG. 2 the connection of the sensor 42 in the housing becomes clear. The sensor 42 is welded with its contact elements 46 directly to a stamped grid 48, which additionally has contact elements 50 for contacting the electric motor 2. The respective opposite ends of the punched grid 48, which also in FIG. 1 to are recognized, serve as connection pins 52 for a connector for controlling the drive unit. 2

Die gesamte in Figur 2 dargestellte Einheit wird bei der Herstellung der Ventilvorrichtung in eine Spritzgussform eingelegt, so dass der Sensor 42 und das Stanzgitter 48 mit Ausnahme der Anschlusspins 52 und der Motorkontaktelemente 50 mit Kunststoff umspritzt werden. So kann zuverlässig ein Lösen der Sensorkontakte 46 vermieden werden, welche am Stanzgitter 48 angeschweißt sind.The entire in FIG. 2 shown unit is inserted in the manufacture of the valve device in an injection mold, so that the sensor 42 and the lead frame 48 with the exception of the connection pins 52 and the motor contact elements 50 are molded with plastic. Thus, a release of the sensor contacts 46 can be reliably avoided, which are welded to the punched grid 48.

Selbstverständlich wäre es zusätzlich möglich, elektronische Bauteile zur Verbesserung der elektromagnetischen Verträglichkeit vor dem Umspritzen auf dem Stanzgitter zu befestigen.Of course, it would also be possible to attach electronic components to improve the electromagnetic compatibility before encapsulation on the stamped grid.

Diese Ventilvorrichtung zeichnet sich durch eine hohe Genauigkeit bei der Lagerückmeldung durch exakte sich nicht verändernde Positionierung des Sensors zum Magneten, durch Anordnung des Magneten auf dem zu detektierenden Element selbst sowie durch eine die thermische Entlastung des Magneten aus. So kann über eine lange Lebensdauer eine korrekte Positionsdetektierung sichergestellt werden. Der Aufbau ist einfach und die Herstellung beziehungsweise Montage weist nur sehr wenige mögliche Fehlerquellen auf.This valve device is characterized by a high accuracy in the bearing feedback by exact non-changing positioning of the sensor to the magnet, by arranging the magnet on the element to be detected itself and by the thermal relief of the magnet. This ensures correct position detection over a long service life. The structure is simple and the production or assembly has very few possible sources of error.

Es sollte deutlich sein, dass der Schutzbereich der Ansprüche nicht auf das beschriebene Ausführungsbeispiel beschränkt ist. Insbesondere können das Kopplungselement und das Trägerelement auch einstückig hergestellt werden, oder das Trägerelement als keramisches isolierendes Teil den Magneten aufnehmen. Auch könnte das Isolierteil als separates Teil zwischen dem Kopplungselement und dem Trägerelement angeordnet werden. Des Weiteren ist die Form des Getriebes oder der Elemente, über die die Drehbewegung in eine translatorische Bewegung umgeformt wird, nicht beschränkend für die vorliegende Erfindung.It should be understood that the scope of the claims is not limited to the embodiment described. In particular, the coupling element and the carrier element can also be produced in one piece, or receive the carrier element as a ceramic insulating part of the magnet. Also, the insulating part could be arranged as a separate part between the coupling element and the carrier element. Furthermore, the shape of the gear or of the elements by which the rotational movement is converted into a translatory motion is not limitative of the present invention.

Claims (8)

  1. A valve device for an internal combustion engine, comprising
    a housing (10),
    in which a drive unit (2) that generates a torque,
    a gearing unit (4),
    a coupling element (6) and
    an adjusting element (8) adapted for translator movement, which is fixedly connected with the coupling element (6),
    are arranged
    characterized in that
    a carrier element (36) is arranged rigidly at the coupling element (6), the carrier element having a magnet (40) fixed thereto which cooperates with a contactless sensor (42) molded into the housing (10).
  2. The valve device for an internal combustion engine of claim 1, characterized in that the sensor (42) is arranged in parallel with the direction of movement of the carrier element (36).
  3. The valve device for an internal combustion engine of one of the preceding claims, characterized in that the sensor (42) is fastened on the ends of a lead frame (48) by welding, the opposite ends of the lead frame (48) serving as connector pins (52) for a connector plug.
  4. The valve device for an internal combustion engine of claim 3, characterized in that the lead frame (48) has contact elements (50) for connecting the drive unit (2), the opposite ends thereof serving as connector pins (52) for the connector plug.
  5. The valve device for an internal combustion engine of one of claims 3 or 4, characterized in that electronic components for enhancing the electromagnetic compatibility are fastened on the lead frame (48).
  6. The valve device for an internal combustion engine of one of the preceding claims, characterized in that a thermally insulating element (44) is arranged between the magnet (40) and the adjusting element (8).
  7. The valve device for an internal combustion engine of claim 6, characterized in that a ceramic element serves as the thermally insulating element (44).
  8. The valve device for an internal combustion engine of one of claims 6 or 7, characterized in that the carrier element (36) is formed integrally with the coupling element (6), and the thermally insulating element (44) and the magnet (40) are integrated in the coupling element (6).
EP10779756.5A 2009-11-24 2010-11-10 Valve device for an internal combustion engine Active EP2504555B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009054311.2A DE102009054311B4 (en) 2009-11-24 2009-11-24 Valve device for an internal combustion engine
PCT/EP2010/067201 WO2011064096A1 (en) 2009-11-24 2010-11-10 Valve device for an internal combustion engine

Publications (2)

Publication Number Publication Date
EP2504555A1 EP2504555A1 (en) 2012-10-03
EP2504555B1 true EP2504555B1 (en) 2015-01-07

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EP10779756.5A Active EP2504555B1 (en) 2009-11-24 2010-11-10 Valve device for an internal combustion engine

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EP (1) EP2504555B1 (en)
DE (1) DE102009054311B4 (en)
WO (1) WO2011064096A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011054082B3 (en) 2011-09-30 2012-12-13 Pierburg Gmbh locking device
WO2017029126A1 (en) * 2015-08-18 2017-02-23 Mahle International Gmbh Valve train of an exhaust gas-conducting apparatus
DE102016116981A1 (en) 2016-09-09 2018-03-15 Kendrion (Villingen) Gmbh Electromagnetic adjusting device, in particular for camshaft adjustment

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JP2768258B2 (en) * 1994-01-31 1998-06-25 株式会社カワデン Electric valve
DE19861176B4 (en) * 1998-07-11 2010-01-14 Pierburg Gmbh adjusting part
DE19848081A1 (en) 1998-09-01 2000-03-02 Mannesmann Vdo Ag Drive device with an actuator
DE20002719U1 (en) * 2000-02-15 2000-05-04 A B Elektronik Gmbh Angle of rotation sensor
DE29916221U1 (en) * 1999-09-15 1999-12-30 A B Elektronik Gmbh Crankshaft encoder
EP1091112B1 (en) 1999-10-05 2004-04-21 Pierburg GmbH Valve, intake air conduit and exhaust gas recirculation unit for combustion engines
US6382195B1 (en) 2000-02-18 2002-05-07 Borgwarner Inc. Exhaust gas recirculation system for an internal combustion engine having an integrated valve position sensor
US6435169B1 (en) 2000-03-17 2002-08-20 Borgwarner Inc. Integrated motor and controller for turbochargers, EGR valves and the like
DE10065144B4 (en) * 2000-12-23 2004-11-25 Conti Temic Microelectronic Gmbh Actuator with an electromagnetic drive rotating an actuator
DE10201141B4 (en) 2002-01-15 2009-10-15 Pierburg Gmbh Stellgetriebe with means for determining the deviation from a predetermined starting position
DE10228689B4 (en) * 2002-06-27 2016-03-17 Conti Temic Microelectronic Gmbh Method for producing an assembly
GB0320335D0 (en) 2003-08-29 2003-10-01 Cooper Standard Automotive Uk Valve
DE10344218B4 (en) * 2003-09-22 2014-10-23 Mahle Filtersysteme Gmbh Exhaust gas recirculation valve
EP1862769A3 (en) * 2006-06-01 2008-07-23 LuK Lamellen und Kupplungsbau Beteiligungs KG Sensor module and method for its manufacture
DE102006041562A1 (en) * 2006-09-05 2008-03-13 Pierburg Gmbh Adjustment device for internal combustion machine, for the adjustment of switching flaps, butterfly valves, has housing, in which electric motor is arranged, which drives drive shaft coupled to control or control organ over drive unit
DE102008049251B4 (en) * 2008-09-26 2021-01-21 Pierburg Gmbh Adjusting device for converting a rotary movement into a linear movement

Also Published As

Publication number Publication date
DE102009054311B4 (en) 2015-03-26
WO2011064096A1 (en) 2011-06-03
EP2504555A1 (en) 2012-10-03
DE102009054311A1 (en) 2011-06-09

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