EP0717185A1 - Exhaust gas recirculation valve - Google Patents

Exhaust gas recirculation valve Download PDF

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Publication number
EP0717185A1
EP0717185A1 EP95115121A EP95115121A EP0717185A1 EP 0717185 A1 EP0717185 A1 EP 0717185A1 EP 95115121 A EP95115121 A EP 95115121A EP 95115121 A EP95115121 A EP 95115121A EP 0717185 A1 EP0717185 A1 EP 0717185A1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
gas recirculation
opening
tube
recirculation valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95115121A
Other languages
German (de)
French (fr)
Other versions
EP0717185B1 (en
Inventor
Gerhard Dipl.-Ing. Schellenberg (Fh)
Johannes Dr.-Ing. Meiwes
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0717185A1 publication Critical patent/EP0717185A1/en
Application granted granted Critical
Publication of EP0717185B1 publication Critical patent/EP0717185B1/en
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
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/55—Systems for actuating EGR valves using vacuum actuators
    • F02M26/58—Constructional details of the actuator; Mounting thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/18—Thermal insulation or heat protection
    • 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
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/21—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system with EGR valves located at or near the connection to the intake system
    • 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
    • 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
    • F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
    • F02M26/47—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition the characteristics being temperatures, pressures or flow rates
    • 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
    • F02M26/68—Closing members; Valve seats; Flow passages
    • 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
    • F02M26/65—Constructional details of EGR valves
    • F02M26/72—Housings

Definitions

  • the invention is based on an exhaust gas recirculation valve according to claim 1.
  • a pipeline part is provided which is designed as an intermediate piece for use in an air line.
  • the pipe part has on one side an opening in the pipe wall through which a connecting piece connected to the exhaust gas recirculation line can be inserted into the interior of the pipe.
  • This nozzle has a flange, via which it is tightly connected to a flange surrounding the opening.
  • a guide socket is formed in the wall of the tube for the tight guidance of a shaft, at the end of which a valve disk is attached, which cooperates with the opening of the socket.
  • the shaft is connected to a pneumatic actuator.
  • this exhaust valve has to be fitted into the air line of the internal combustion engine in a complex manner and, on the other hand, it has to be assembled with complex assembly work.
  • Such exhaust gas recirculation valves are used for metering exhaust gas recirculation quantities that are controlled by opening or closing the exhaust gas valve via the actuator. For exact Dosing the exhaust gas recirculation quantities it is also necessary to measure the recirculated exhaust gas quantities. Only then can the exhaust gas recirculation quantities be precisely controlled. Such a measurement ultimately also provides information about the functionality of the exhaust gas recirculation valve. Such a device is not provided in the known exhaust gas recirculation valve.
  • the exhaust gas recirculation valve according to the invention has the advantage that a measurement of exhaust gas recirculation quantities is possible and that, in addition, a point immediately adjacent to the actual inflow point of recirculated exhaust gas is used to record the exhaust gas recirculation quantities.
  • the exhaust gas recirculation quantity is introduced directly into the fresh air stream via the nozzle, there is the advantage that the measuring point is cooled in a very effective manner by the air stream without additional measures having to be taken. This improves the security of the measurement.
  • the valve member can be used together with its actuator through an opening provided in the tube, and at the same time a connection can be made to the measuring point on the connecting piece.
  • the actuator and valve member can be preassembled in a simplified manner and can easily be inserted into the tube, which can be part of the intake system of the internal combustion engine, for example.
  • the tube can also be a further part of the exhaust gas recirculation line, the same advantageous mounting options being obtained.
  • the actuator, the valve member and the connecting piece are combined to form a structural unit, so that this unit can easily be seen from one side the pipe can be used in pre-assembled form. This is also particularly advantageous according to claim 12 when the exhaust gas recirculation valve is not provided with a measuring point on the nozzle.
  • the development according to claim 3 has the advantage that the recording of the measured variables and their evaluation can take place at separate points.
  • the evaluation device is assigned to the actuator outside the tube. This avoids long line connections and has the advantage of forming a compact arrangement.
  • a cross-sectional constriction is provided on the exhaust pipe as a device for recording the measured values for the exhaust gas recirculation quantities, and the pressures upstream and downstream of the cross-sectional constriction are evaluated.
  • This can be done either by pressure sensors arranged locally on the nozzle or by the fact that, according to claim 5, control openings are provided upstream and downstream of the cross-sectional constriction, which transmit the pressure prevailing there via pipes to the evaluation device on the actuator.
  • These pipes can be integrated in a particularly advantageous manner according to claim 7 in the connecting part connecting the actuator to the connecting piece. The result is a particularly compact unit that can be easily installed in an existing pipe on the internal combustion engine.
  • this compact unit can also be installed in the air intake system of the internal combustion engine according to claim 17, the exhaust gas recirculating connection piece being optimally cooled together with any pressure sensors provided directly on the connection piece. Furthermore, the actuator is no longer exposed to the hot exhaust gas in this case, but is also cooled by the flowing air in the air intake pipe in such a way that that the actuator can be built from molded plastic parts, which is particularly economical.
  • FIG. 1 shows a first longitudinal section through the pipe together with the exhaust gas recirculation valve and
  • FIG. 2 shows a section perpendicular to the representation according to FIG. 1.
  • a tube 1 which can be part of an air intake system of an internal combustion engine or can also be part of an exhaust gas recirculation line in an embodiment with a smaller diameter.
  • This pipe has in its peripheral wall a first pipe socket 2, which forms a first opening 3 in the wall of the pipe 1 and diametrically opposite the first pipe socket 2, a second pipe socket 4, which forms a second opening 5 in the wall of the pipe 1.
  • the diameter of the first opening 3 is larger than the diameter of the second opening 5.
  • the second pipe socket 4 is retracted at its outermost outer end to form an annular shoulder 7 pointing into the interior of the pipe 1 a closing part 9 made of sheet metal with a flange-shaped, radially outward-pointing shape 10 for contact.
  • the closing part is formed approximately in the shape of a truncated cone in the course of the tube and firmly connected at its end opposite the formation 10 with a plate 11, z. B. soldered to the inside of the locking part 9, the end of a connecting piece 12 is additionally fastened. This can also be soldered to the plate and encloses one Through hole 13 of the plate, which forms a diameter-equal passage to the diameter of a return line 14 flanged to the plate 11.
  • the connector 12 projects diametrically and coaxially to the first opening 3 and second opening 5 into the tube 1 and has at its inner end on the end face a valve seat 16 on which a valve disk 17 of a valve member 18 of the exhaust gas recirculation valve according to the invention comes to rest.
  • the valve plate sits at the end of a valve stem 19, which is guided at the other end in a housing 21 of an actuator 22. This is inserted with its housing 22 in the first pipe socket 2 with a tight seal of the opening 3.
  • the actuator consists of a pneumatically working pressure cell with an actuating membrane 23 clamped between the housing halves, to which the end 25 of the valve stem is connected by suitable means 24.
  • These means comprise a dimensionally stable spring plate 26 which has a blind hole 27 for fixing the shaped neck of the actuating membrane 23, into which the valve stem is pressed with a fir tree profile.
  • the corresponding control pressure is supplied to the working space 29 via a pressure line 30.
  • FIG. 2 shows in another section that the connector 12 together with the closing part 9 and plate 11 is connected to the housing 21 of the actuator 22 via a connecting part 32.
  • This connecting part consists of a part 33 which surrounds the connector 12 and into which a first pipeline 34 and a second pipeline 35 are enclosed. These pipes are offset to the socket 12, axially parallel to this, to the first opening 3 and open there into a connecting piece 36, which in turn is connected to the housing 21 or via this to the pipe socket.
  • Pressure chambers 37 and 38 are enclosed between this and the housing 21, which have a connection to an evaluation device, not shown, of the pressure difference between the pressures entering the pressure chamber 37 via the first pipeline 34 and the pressures entering the pressure chamber 38 via the second pipeline 35.
  • the first and the second pipeline 34, 35 are firmly connected to the connecting part 32 and the housing 21, so that they form a part to be handled together with the connecting piece 12, the closing part 9 and the plate 11 such that this part by the first opening 3 can be inserted into the tube 1 and can be partially guided out of it again through the second opening 5 until the closing part 9 comes into contact with the annular shoulder 7 via the seal 8.
  • the housing 21 of the actuator 22 has also sealed the first opening 3. In this way, the exhaust gas recirculation valve can be inserted into the pipe 1 in a very simple manner, which considerably simplifies assembly and also lowers the costs for implementing the exhaust gas recirculation valve.
  • the connecting piece 36 and the housing 21 of the actuator 22 are made in two parts and are used one after the other in the opening 3 of the first pipe socket. Appropriate seals between these two parts are required.
  • the connecting piece 36 then has an axial opening 39 which is so large that the valve plate 17 can be passed through.
  • the tube 1 is in turn sealed tightly to the outside.
  • the passage of the valve stem to the actuating diaphragm need not be completely tight, since between the actuating diaphragm 23 and There is a reference pressure chamber connected to the environment on the valve stem side housing part.
  • an exhaust gas recirculation valve designed in this way it is possible to measure the amount of exhaust gas recirculation that is supplied by a diameter constriction 43 being provided between the opening 40 of the first pipeline 34 into the interior of the connector 12 and the opening 41 of the second pipeline 35 into the interior of the adapter, through which between a differential pressure is formed upstream and downstream of the same nozzle area, which is dependent in a known manner on the amount flowing through, in this case the exhaust gas recirculation amount flowing through.
  • the pressures that arise are detected by the evaluation device described above.
  • the connecting part in particular in the embodiment of the type shown in FIG. 2, is preferably constructed from embossed sheet metal parts.
  • the closing part 9 and the socket 12 are preferably stamped from sheet metal.
  • the housing 21 of the actuator 22 can be made of plastic parts, since the heat supplied via the exhaust gas recirculation is rapidly produced by the intensive cooling by the supplied air flow is transported away.
  • the connecting part 32 in particular in the event that electronic pressure transducers are provided on the connecting piece, is also optimally cooled by the air flowing past, so that the best conditions for recording measured values are possible with low demands on the transmitter.
  • the funnel-shaped configuration of the closing part 9, which enables an even longer washing length for the nozzle 12, is advantageous here.

Abstract

The valve controls the quantity of exhaust gases fed to the air intake of the i.c. engine, with the valve element (18) cooperating with the valve seat (16) adjusted via a setting drive (22). The actual quantity of recycled exhaust gases fed to the air intake is detected by a measuring device downstream of the valve element and supplied to an evaluation device controlling the setting drive. Pref. the measuring device uses a flow restriction (43) downstream of the valve with associated pressure sensors (40,41) on either side of it.

Description

Stand der TechnikState of the art

Die Erfindung geht von einem Abgasrückführventil gemäß Anspruch 1 aus. Bei einem solchen durch die DE-C 43 25 169 bekannten Abgasrückführventil ist ein Rohrleitungsteil vorgesehen, das als Zwischenstück zum Einsatz in eine Luftleitung konzipiert ist. Das Rohrleitungsteil weist auf der einen Seite eine Öffnung in der Rohrwandung auf, durch die ein mit der Abgasrückführleitung verbundener Stutzen ins Innere des Rohres einführbar ist. Dieser Stutzen hat einen Flansch, über den er mit einem die Öffnung umgebenden Flansch dicht verbunden wird. Gegenüberliegend vom Stutzen ist in der Wand des Rohres ein Führungsstutzen ausgeformt zur dichten Führung eines Schaftes, an dessen Ende ein Ventilteller angebracht ist, der mit der Öffnung des Stutzens zusammenwirkt. Der Schaft ist an seinen aus dem Rohr herausragenden Ende mit einem pneumatischen Stellantrieb verbunden. Dieses Abgasventil muß zum einen in aufwendiger Weise in die Luftleitung der Brennkraftmaschine eingepaßt werden, und zum anderen ist es mit einer aufwendigen Montagearbeit zusammenzubauen. Solche Abgasrückführventile dienen der Dosierung von Abgasrückführmengen, die durch Öffnen oder Schließen des Abgasventils über den Stellantrieb gesteuert werden. Zur genauen Dosierung der Abgasrückführmengen ist es darüber hinaus erforderlich, die rückgeführten Abgasmengen auch zu messen. Nur dann kann eine genaue Regelung der Abgasrückführmengen erfolgen. Eine solche Messung gibt letztlich auch Rückschluß über die Funktionsfähigkeit des Abgasrückführventils. Eine solche Einrichtung ist bei dem bekannten Abgasrückführventil nicht vorgesehen.The invention is based on an exhaust gas recirculation valve according to claim 1. In such an exhaust gas recirculation valve known from DE-C 43 25 169, a pipeline part is provided which is designed as an intermediate piece for use in an air line. The pipe part has on one side an opening in the pipe wall through which a connecting piece connected to the exhaust gas recirculation line can be inserted into the interior of the pipe. This nozzle has a flange, via which it is tightly connected to a flange surrounding the opening. Opposite the socket, a guide socket is formed in the wall of the tube for the tight guidance of a shaft, at the end of which a valve disk is attached, which cooperates with the opening of the socket. At its end protruding from the tube, the shaft is connected to a pneumatic actuator. On the one hand, this exhaust valve has to be fitted into the air line of the internal combustion engine in a complex manner and, on the other hand, it has to be assembled with complex assembly work. Such exhaust gas recirculation valves are used for metering exhaust gas recirculation quantities that are controlled by opening or closing the exhaust gas valve via the actuator. For exact Dosing the exhaust gas recirculation quantities it is also necessary to measure the recirculated exhaust gas quantities. Only then can the exhaust gas recirculation quantities be precisely controlled. Such a measurement ultimately also provides information about the functionality of the exhaust gas recirculation valve. Such a device is not provided in the known exhaust gas recirculation valve.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Abgasrückführventil hat demgegenüber den Vorteil, daß eine Messung von Abgasrückführmengen möglich ist und daß darüber hinaus eine der tatsächlichen Einströmstelle von rückgeführtem Abgas unmittelbar benachbarte Stelle zur Erfassung der Abgasrückführmengen verwendet wird. Insbesondere, wenn die Abgasrückführmenge über den Stutzen direkt in den Frischluftstrom eingeführt wird, ergibt sich der Vorteil, daß die Meßstelle durch den Luftstrom auf sehr effektive Weise gekühlt wird, ohne daß zusätzliche Maßnahmen getroffen werden müssen. Damit wird die Sicherheit der Messung verbessert.In contrast, the exhaust gas recirculation valve according to the invention has the advantage that a measurement of exhaust gas recirculation quantities is possible and that, in addition, a point immediately adjacent to the actual inflow point of recirculated exhaust gas is used to record the exhaust gas recirculation quantities. In particular, if the exhaust gas recirculation quantity is introduced directly into the fresh air stream via the nozzle, there is the advantage that the measuring point is cooled in a very effective manner by the air stream without additional measures having to be taken. This improves the security of the measurement.

In besonders vorteilhafter Weiterbildung gemäß Patentanpruch 2 ist das Ventilglied zusammen mit seinem Stellantrieb durch eine in dem Rohr vorgesehene Öffnung einsetzbar und dabei zugleich eine Verbindung mit der Meßstelle am Stutzen herstellbar. Dies hat den Vorteil, daß Stellantrieb und Ventilglied in vereinfachter Weise vormontierbar sind und einfach in das Rohr, das beispielsweise Teil des Ansaugsystems der Brennkraftmaschine sein kann, einsetzbar ist. Das Rohr kann andererseits auch ein weiterführender Teil der Abgasrückführleitung sein, wobei sich dieselben vorteilhaften Montagemöglichkeiten ergeben. In Weiterbildung dieser Ausgestaltung ist gemäß Patentanspruch 7 der Stellantrieb, das Ventilglied und der Stutzen zu einer Baueinheit zusammengefaßt, so daß diese Einheit in einfacher Weise von der einen Seite des Rohres her in vormontierter Form einsetzbar ist. Dies ist gemäß Patentanspruch 12 auch dann besonders vorteilhaft, wenn das Abgasrückführventil nicht mit einer Meßstelle am Stutzen versehen ist.In a particularly advantageous development according to patent claim 2, the valve member can be used together with its actuator through an opening provided in the tube, and at the same time a connection can be made to the measuring point on the connecting piece. This has the advantage that the actuator and valve member can be preassembled in a simplified manner and can easily be inserted into the tube, which can be part of the intake system of the internal combustion engine, for example. On the other hand, the tube can also be a further part of the exhaust gas recirculation line, the same advantageous mounting options being obtained. In a further development of this embodiment, the actuator, the valve member and the connecting piece are combined to form a structural unit, so that this unit can easily be seen from one side the pipe can be used in pre-assembled form. This is also particularly advantageous according to claim 12 when the exhaust gas recirculation valve is not provided with a measuring point on the nozzle.

Die Weiterbildung gemäß Patentanspruch 3 hat den Vorteil, daß die Aufnahme der Meßgrößen und deren Auswertung an getrennten Stellen erfolgen kann. So ist gemäß Patentanpruch 3 die Auswerteeinrichtung außerhalb des Rohres dem Stellantrieb zugeordnet. Das vermeidet lange Leitungsverbindungen und hat den Vorteil, eine kompakte Anordnung zu bilden.The development according to claim 3 has the advantage that the recording of the measured variables and their evaluation can take place at separate points. Thus, according to patent claim 3, the evaluation device is assigned to the actuator outside the tube. This avoids long line connections and has the advantage of forming a compact arrangement.

Gemäß Patentanspruch 4 ist als Einrichtung zur Aufnahme der Meßwerte für die Abgasrückführmengen eine Querschnittsverengung am Abgasstutzen vorgesehen, und es werden dabei die Drücke stromauf und stromab der Querschnittsverengung erfaßt ausgewertet. Dies kann entweder durch örtlich am Stutzen angeordnete Drucksensoren erfolgen oder dadurch erfolgen, daß gemäß Patentanspruch 5 Steueröffnungen stromauf und stromab der Querschnittverengung vorgesehen sind, die den dort herrschenden Druck über Rohrleitungen zur Auswerteeinrichtung am Stellantrieb weiterleiten. Diese Rohrleitungen können dabei in besonders vorteilhafter Weise gemaß Patentanspruch 7 in dem den Stellantrieb mit dem Stutzen verbindenden Verbindungsteil integriert sein. Es ergibt sich somit eine besonders kompakt aufgebaute Einheit, die sich sehr leicht in ein vorhandenes Rohr an der Brennkraftmaschine einbauen läßt. Besondere Vorteile ergeben sich dabei dadurch, daß diese kompakte Einheit auch gemäß Patentanspruch 17 in das Luftansaugsystem der Brennkraftmaschine einbaubar ist, wobei der Abgasrückführmengen führenden Stutzen optimal gekühlt wird zusammen mit eventuell vorgesehen Drucksensoren direkt am Stutzen. Weiterhin ist der Stellantrieb in diesem Fall nicht mehr dem heißen Abgas ausgesetzt, sondern wird ebenfalls durch die strömende Luft im Luftansaugrohr gekühlt derart, daß der Stellantrieb aus Kunststoffspritzteilen gebaut werden kann, was besonders wirtschaftlich ist.According to claim 4, a cross-sectional constriction is provided on the exhaust pipe as a device for recording the measured values for the exhaust gas recirculation quantities, and the pressures upstream and downstream of the cross-sectional constriction are evaluated. This can be done either by pressure sensors arranged locally on the nozzle or by the fact that, according to claim 5, control openings are provided upstream and downstream of the cross-sectional constriction, which transmit the pressure prevailing there via pipes to the evaluation device on the actuator. These pipes can be integrated in a particularly advantageous manner according to claim 7 in the connecting part connecting the actuator to the connecting piece. The result is a particularly compact unit that can be easily installed in an existing pipe on the internal combustion engine. Particular advantages result from the fact that this compact unit can also be installed in the air intake system of the internal combustion engine according to claim 17, the exhaust gas recirculating connection piece being optimally cooled together with any pressure sensors provided directly on the connection piece. Furthermore, the actuator is no longer exposed to the hot exhaust gas in this case, but is also cooled by the flowing air in the air intake pipe in such a way that that the actuator can be built from molded plastic parts, which is particularly economical.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 einen ersten Längsschnitt durch das Rohr zusammen mit dem Abgasrückführventil und Figur 2 einen Schnitt senkrecht zur Darstellung gemäß Figur 1.An embodiment of the invention is shown in the drawing and is explained in more detail in the following description. FIG. 1 shows a first longitudinal section through the pipe together with the exhaust gas recirculation valve and FIG. 2 shows a section perpendicular to the representation according to FIG. 1.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Bei dem in der Zeichnung wiedergegebenen Ausführungsbeispiel ist ein Rohr 1 gezeigt, das Teil eines Luftansaugsystems einer Brennkraftmaschine sein kann oder auch bei einer Ausführung mit geringerem Durchmesser Teil einer Abgasrückführleitung sein kann. Dieses Rohr weist in seiner Umfangswand einen ersten Rohrstutzen 2, der eine erste Öffnung 3 in der Wand des Rohres 1 bildet und dem ersten Rohrstutzen 2 diametral gegenüberliegend einen zweiten Rohrstutzen 4 auf, der eine zweite Öffnung 5 in der Wand des Rohres 1 bildet. Der Durchmesser der ersten Öffnung 3 ist dabei größer als der Durchmesser der zweiten Öffnung 5. Der zweite Rohrstutzen 4 ist an seinem äußersten außenliegenden Ende eingezogen unter Bildung einer ringförmigen, ins Innere des Rohres 1 weisenden Schulter 7. An dieser kommt unter Zwischenlage einer Dichtung 8 ein aus Blech geformtes Schließteil 9 mit einer flanschförmigen radial auswärts weisenden Ausformung 10 zur Anlage. Das Schließteil ist dabei unter Bildung einer Ausnehmung im Verlauf des Rohres in etwa kegelstumpfförmig ausgebildet und an seinem der Ausformung 10 gegenüberliegenden Ende mit einer Platte 11 fest verbunden, z. B. verlötet, an der konzentrisch zum Schließteil 9 innenliegend zusätzlich das Ende eines Stutzens 12 befestigt ist. Dieser kann ebenfalls mit der Platte verlötet werden und umschließt eine Durchgangsbohrung 13 der Platte, die einen durchmessergleichen Durchtritt zum Durchmesser einer an die Platte 11 angeflanschten Rückführleitung 14 bildet.In the exemplary embodiment shown in the drawing, a tube 1 is shown, which can be part of an air intake system of an internal combustion engine or can also be part of an exhaust gas recirculation line in an embodiment with a smaller diameter. This pipe has in its peripheral wall a first pipe socket 2, which forms a first opening 3 in the wall of the pipe 1 and diametrically opposite the first pipe socket 2, a second pipe socket 4, which forms a second opening 5 in the wall of the pipe 1. The diameter of the first opening 3 is larger than the diameter of the second opening 5. The second pipe socket 4 is retracted at its outermost outer end to form an annular shoulder 7 pointing into the interior of the pipe 1 a closing part 9 made of sheet metal with a flange-shaped, radially outward-pointing shape 10 for contact. The closing part is formed approximately in the shape of a truncated cone in the course of the tube and firmly connected at its end opposite the formation 10 with a plate 11, z. B. soldered to the inside of the locking part 9, the end of a connecting piece 12 is additionally fastened. This can also be soldered to the plate and encloses one Through hole 13 of the plate, which forms a diameter-equal passage to the diameter of a return line 14 flanged to the plate 11.

Der Stutzen 12 ragt diametral und koaxial zur ersten Öffnung 3 und zweiten Öffnung 5 in das Rohr 1 hinein und weist an seinem innenliegenden Ende an der Stirnseite ein Ventilsitz 16 auf, an dem ein Ventilteller 17 eines Ventilglieds 18 des erfindungsgemäßen Abgasrückführventils zur Anlage kommt. Der Ventilteller sitzt am Ende eines Ventilschaftes 19, der anderen Endes in einem Gehäuse 21 eines Stellantriebs 22 geführt ist. Dieser ist mit seinem Gehäuse 22 unter dichtem Verschluß der Öffnung 3 in den ersten Rohrstutzen 2 eingesetzt. Der Stellantrieb besteht dabei im ausgeführten Beispiel aus einer pneumatisch arbeitenden Druckdose mit einer zwischen Gehäusehälften eingespannten Stellmembran 23, mit der durch geeignete Mittel 24 das Ende 25 des Ventilschaftes verbunden ist. Diese Mittel umfassen einen formstabilen Federteller 26, der zur Fixierung des ausgeformten Halses der Stellmembran 23 ein Sackloch 27 aufweist, in den der Ventilschaft mit einem Tannenbaumprofil eingepreßt ist.The connector 12 projects diametrically and coaxially to the first opening 3 and second opening 5 into the tube 1 and has at its inner end on the end face a valve seat 16 on which a valve disk 17 of a valve member 18 of the exhaust gas recirculation valve according to the invention comes to rest. The valve plate sits at the end of a valve stem 19, which is guided at the other end in a housing 21 of an actuator 22. This is inserted with its housing 22 in the first pipe socket 2 with a tight seal of the opening 3. In the example shown, the actuator consists of a pneumatically working pressure cell with an actuating membrane 23 clamped between the housing halves, to which the end 25 of the valve stem is connected by suitable means 24. These means comprise a dimensionally stable spring plate 26 which has a blind hole 27 for fixing the shaped neck of the actuating membrane 23, into which the valve stem is pressed with a fir tree profile.

In dem von der Stellmembran 23 im Gehäuse 21 eingeschlossenen Arbeitsraum 28 ist eine Rückführfeder 29 eingespannt, die sich zwischen dem Federteller und dem Gehäuse abstützt. Über eine Druckleitung 30 wird dem Arbeitsraum 29 der entsprechende Steuerdruck zugeführt.A return spring 29, which is supported between the spring plate and the housing, is clamped in the working space 28 enclosed by the actuating membrane 23 in the housing 21. The corresponding control pressure is supplied to the working space 29 via a pressure line 30.

In weiterer Ausgestaltung des Abgasrückführventils nach Figur 1 ist der Figur 2 in einem anderen Schnitt zu entnehmen, daß der Stutzen 12 zusammen mit Schließteil 9 und Platte 11 über ein Verbindungsteil 32 mit dem Gehäuse 21 des Stellantriebs 22 verbunden ist. Dieses Verbindungsteil besteht aus einem den Stutzen 12 von außen umfassenden Teil 33, in den eine erste Rohrleitung 34 und eine zweite Rohrleitung 35 eingeschlossen sind. Diese Rohrleitungen verlaufen versetzt zum Stutzen 12, achsparallel zu diesem, zur ersten Öffnung 3 hin und münden dort in ein Verbindungsstück 36, das seinerseits wieder mit dem Gehäuse 21 bzw. über dieses mit dem Rohrstutzen verbunden ist. Zwischen diesem und dem Gehäuse 21 werden Druckräume 37 und 38 eingeschlossen, die Verbindung zu einer nicht weiter dargestellten Auswerteeinrichtung der Druckdifferenz zwischen den über die erste Rohrleitung 34 in den Druckraum 37 und dem über die zweite Rohrleitung 35 in den Druckraum 38 gelangenden Drücke haben. Die erste und die zweite Rohrleitung 34, 35 sind dabei fest mit dem Verbindungsteil 32 und dem Gehäuse 21 verbunden, so daß diese zusammen mit dem Stutzen 12, dem Schließteil 9 und der Platte 11 ein gemeinsam zu handhabendes Teil bilden derart, daß dieses Teil durch die erste Öffnung 3 hindurch in das Rohr 1 eingeführt werden kann und aus diesem wieder heraus durch die zweite Öffnung 5 zum Teil wieder hinausgeführt werden kann, bis das Schließteil 9 über die Dichtung 8 an der ringförmigen Schulter 7 zur Anlage kommt. In diesem Punkt hat dann das Gehäuse 21 des Stellantriebs 22 auch die erste Öffnung 3 dicht verschlossen. Auf diese Art und Weise läßt sich das Abgasrückführventil in sehr einfacher Weise in das Rohr 1 einsetzen, was die Montage erheblich vereinfacht und auch die Kosten zur Ausführung des Abgasrückführventiles senkt.In a further embodiment of the exhaust gas recirculation valve according to FIG. 1, FIG. 2 shows in another section that the connector 12 together with the closing part 9 and plate 11 is connected to the housing 21 of the actuator 22 via a connecting part 32. This connecting part consists of a part 33 which surrounds the connector 12 and into which a first pipeline 34 and a second pipeline 35 are enclosed. These pipes are offset to the socket 12, axially parallel to this, to the first opening 3 and open there into a connecting piece 36, which in turn is connected to the housing 21 or via this to the pipe socket. Pressure chambers 37 and 38 are enclosed between this and the housing 21, which have a connection to an evaluation device, not shown, of the pressure difference between the pressures entering the pressure chamber 37 via the first pipeline 34 and the pressures entering the pressure chamber 38 via the second pipeline 35. The first and the second pipeline 34, 35 are firmly connected to the connecting part 32 and the housing 21, so that they form a part to be handled together with the connecting piece 12, the closing part 9 and the plate 11 such that this part by the first opening 3 can be inserted into the tube 1 and can be partially guided out of it again through the second opening 5 until the closing part 9 comes into contact with the annular shoulder 7 via the seal 8. At this point, the housing 21 of the actuator 22 has also sealed the first opening 3. In this way, the exhaust gas recirculation valve can be inserted into the pipe 1 in a very simple manner, which considerably simplifies assembly and also lowers the costs for implementing the exhaust gas recirculation valve.

Denkbar ist dabei, daß das Verbindungsstück 36 und das Gehäuse 21 des Stellantriebs 22 zweiteilig ausgeführt sind und nacheinander in die Öffnung 3 des ersten Rohrstutzens eingesetzt werden. Dabei sind entsprechende Dichtungen zwischen diesen beiden Teilen erforderlich. Das Verbindungsstück 36 hat dann einen axialen Durchbruch 39, der so groß ist, daß der Ventilteller 17 hindurchgeführt werden kann. Nach Aufsetzen des Gehäuses 21 des Stellantriebs ist dann wiederum das Rohr 1 dicht nach außen verschlossen. Dabei braucht jedoch die Durchführung des Ventilschaftes zur Stellmembran nicht völlig dicht sein, da zwischen Stellmembran 23 und Ventilschaftseitigem Gehäuseteil ein mit der Umwelt verbundener Referenzdruckraum vorhanden ist.It is conceivable that the connecting piece 36 and the housing 21 of the actuator 22 are made in two parts and are used one after the other in the opening 3 of the first pipe socket. Appropriate seals between these two parts are required. The connecting piece 36 then has an axial opening 39 which is so large that the valve plate 17 can be passed through. After the housing 21 of the actuator has been put in place, the tube 1 is in turn sealed tightly to the outside. However, the passage of the valve stem to the actuating diaphragm need not be completely tight, since between the actuating diaphragm 23 and There is a reference pressure chamber connected to the environment on the valve stem side housing part.

Mit einem derart ausgestalteten Abgasrückführventil ist es möglich, die zugeführte Abgasrückführmenge zu messen, indem zwischen der Einmündung 40 der ersten Rohrleitung 34 ins Innere des Stutzens 12 und der Einmündung 41 der zweiten Rohrleitung 35 ins Innere des Stutzens eine Durchmesserverengung 43 vorgesehen ist, durch die zwischen stromaufwärts und dem stromabwärts desselben liegenden Stutzenbereichen ein Differenzdruck gebildet ist, der in bekannter Weise abhängig ist von der durchströmenden Menge, in diesem Fall der durchströmenden Abgasrückführmenge. Die sich einstellenden Drücke werden durch die oben beschriebene Auswerteeinrichtung erfaßt.With an exhaust gas recirculation valve designed in this way, it is possible to measure the amount of exhaust gas recirculation that is supplied by a diameter constriction 43 being provided between the opening 40 of the first pipeline 34 into the interior of the connector 12 and the opening 41 of the second pipeline 35 into the interior of the adapter, through which between a differential pressure is formed upstream and downstream of the same nozzle area, which is dependent in a known manner on the amount flowing through, in this case the exhaust gas recirculation amount flowing through. The pressures that arise are detected by the evaluation device described above.

Denkbar ist es ferner, daß diese Drücke bereits an Ort und Stelle durch elektronische Druckaufnehmer erfaßt werden, deren Meßwerte über Anschlußleitungen, die in einem vergleichsweise ausgebildeten Verbindungsteil 32 zum Stellantrieb 22 hin herausgeführt werden und dort einer entsprechenden Steuereinrichtung zugeführt werden.It is also conceivable that these pressures are already detected on the spot by electronic pressure transducers, the measured values of which are fed via connecting lines which are led out to the actuator 22 in a comparatively designed connecting part 32 and are fed there to a corresponding control device.

Das Verbindungsteil, insbesondere bei der Ausführung der in der Figur 2 gezeigten Art, wird vorzugsweise aus geprägten Blechteilen aufgebaut. Auch das Schließteil 9 und der Stutzen 12 werden vorzugsweise aus Blech geprägt. Dagegen kann in dem Fall, in dem insbesondere das Rohr 1 zur Zuführung von Luft mit über das Abgasventil zugeführtem Abgas dient, das Gehäuse 21 des Stellantriebs 22 ausgespritzten Kunststoffteilen bestehen, da durch die intensive Kühlung durch den zugeführten Luftstrom die über die Abgasrückführung zugeführte Wärme schnell wegtransportiert wird. Auch das Verbindungsteil 32, insbesondere für den Fall, daß elektronische Druckaufnehmer am Stutzen vorgesehen sind, wird ebenfalls optimal durch die vorbeistreichende Luft gekühlt, so daß hier beste Bedingungen für eine Meßwertaufnahme bei geringen Anforderungen an den Meßwertgeber möglich sind. Vorteilhaft ist hier die trichterförmige Ausgestaltung des Schließteils 9, die eine noch längere Umspülungslänge für den Stutzen 12 ermöglicht.The connecting part, in particular in the embodiment of the type shown in FIG. 2, is preferably constructed from embossed sheet metal parts. The closing part 9 and the socket 12 are preferably stamped from sheet metal. In contrast, in the case in which the pipe 1 is used in particular for supplying air with exhaust gas supplied via the exhaust valve, the housing 21 of the actuator 22 can be made of plastic parts, since the heat supplied via the exhaust gas recirculation is rapidly produced by the intensive cooling by the supplied air flow is transported away. The connecting part 32, in particular in the event that electronic pressure transducers are provided on the connecting piece, is also optimally cooled by the air flowing past, so that the best conditions for recording measured values are possible with low demands on the transmitter. The funnel-shaped configuration of the closing part 9, which enables an even longer washing length for the nozzle 12, is advantageous here.

Claims (18)

Abgasrückführventil zur Steuerung von Abgasrückführmengen, die der Saugseite einer Brennkraftmaschine zugeführt werden, mit einem in ein Rohr (1) ragenden, mit dem Abgassammelsystem verbundenen und Teil einer Abgasrückführleitung (14) bildenden Stutzen (12), an dessen stirnseitiger Mündung ein Ventilsitz (16) ausgebildet ist, mit dem ein von einer Stellantrieb (22) betätigtes Ventilglied (18) zusammenwirkt, dadurch gekennzeichnet, daß am Stutzen (12) stromaufwärts der Einmündung in das Rohr (1) wenigstens ein Teil einer Meßeinrichtung in Form einer Meßwertaufnahmevorrichtung zur Erfassung von durch das Abgasrückführventil zugeführten Abgasmengen angeordnet ist.Exhaust gas recirculation valve for controlling exhaust gas recirculation quantities, which are supplied to the suction side of an internal combustion engine, with a connection piece (12) which projects into a pipe (1) and which is connected to the exhaust gas collection system and forms part of an exhaust gas recirculation line (14) and has a valve seat (16) at its front opening. is designed, with which a valve member (18) actuated by an actuator (22) cooperates, characterized in that at least one part of a measuring device in the form of a measured value recording device for detecting by at the connecting piece (12) upstream of the opening into the pipe (1) the exhaust gas recirculation valve is arranged. Abgasrückführventil nach Anspruch 1, dadurch gekennzeichnet, daß das Ventilglied (18) als Tellerventilglied ausgebildet ist mit einem Ventilteller (17) am Ende eines Ventilschaftes (19), der durch eine dem Stutzen (12) gegenüberliegende Öffnung (3) in der Wand des Rohres in das Rohr (1) ragt und der Stellantrieb (22) im Bereich der Öffnung (3) mit dem Rohr lösbar verbunden ist und eine feste Verbindung zu dem wenigstens einen Teil der Meßeinrichtung bildenden Teil (32) am Stutzen (12) hat.Exhaust gas recirculation valve according to claim 1, characterized in that the valve member (18) is designed as a poppet valve member with a valve plate (17) at the end of a valve stem (19) which through an opening (3) opposite the nozzle (12) in the wall of the tube protrudes into the tube (1) and the actuator (22) is detachably connected to the tube in the area of the opening (3) and has a fixed connection to the part (32) forming part of the measuring device on the nozzle (12). Abgasrückführventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß dem Stellantrieb (22) eine Auswerteeinrichtung des aufgenommenen Meßwertes als anderer Teil der Meßeinrichtung zugeordnet ist.Exhaust gas recirculation valve according to claim 1 or 2, characterized in that the actuator (22) is assigned an evaluation device of the recorded measured value as another part of the measuring device. Abgasrückführventil nach Anspruch 3, dadurch gekennzeichnet, daß die Meßwertaufnahmeeinrichtung eine Querschnittsverengung (43) ist, die stromaufwärts des Ventilsitzes (16) im Stutzen (12) angeordnet ist, stromaufwärts und stromabwärts von der in der Wand des Stutzens je ein Druckaufnehmer (40, 41) angeordnet sind, die je über eine Leitung (34, 35) mit dem mit dem Rohr verbundenen Gehäuse des Stellantriebs (22) verbunden sind, welches Gehäuse mit der Auswerteeinrichtung verbunden ist.Exhaust gas recirculation valve according to claim 3, characterized in that the measured value recording device is a cross-sectional constriction (43) which is arranged upstream of the valve seat (16) in the connector (12), upstream and downstream of that in each case a pressure transducer (40, 41 ) are arranged, each of which is connected via a line (34, 35) to the housing of the actuator (22) connected to the tube, which housing is connected to the evaluation device. Abgasrückführventil nach Anspruch 4, dadurch gekennzeichnet, daß die Druckaufnehmer in der Wand des Stutzens mündende Mündungen (40, 41) von Rohrleitungen (34, 35) sind, die über das Gehäuse (21) des Stellantriebs (22) mit der Auswerteeinrichtung verbunden sind und die Auswerteeinrichtung einen Differenzdrucksensor enthält.Exhaust gas recirculation valve according to claim 4, characterized in that the pressure transducers are openings (40, 41) of pipes (34, 35) opening into the wall of the connecting piece, which are connected to the evaluation device via the housing (21) of the actuator (22) and the evaluation device contains a differential pressure sensor. Abgasrückführventil nach Anspruch 5, dadurch gekennzeichnet, daß die Auswerteeinrichtung im Gehäuse (21) integriert ist.Exhaust gas recirculation valve according to claim 5, characterized in that the evaluation device is integrated in the housing (21). Abgasrückführventil nach Anspruch 3 bis 6, dadurch gekennzeichnet, daß der Öffnung in der Wand des Rohres (1) als erster Öffnung (3) diametral gegenüberliegend eine zweite Öffnung (5) in der Wand des Rohres (1) vorgesehen ist, und der Stutzen (12) zusammen mit einem diesen positionierenden und die zweite Öffnung (5) verschließenden Schließteil (9) durch die erste Öffnung (3) hindurchführbar ist wobei der Stutzen (12) über ein die Leitungen (34, 35) aufnehmendes Verbindungsteil (32) mit dem Gehäuse (21) starr verbunden ist.Exhaust gas recirculation valve according to Claims 3 to 6, characterized in that the opening in the wall of the tube (1) is provided as the first opening (3) diametrically opposite a second opening (5) in the wall of the tube (1), and the connecting piece ( 12) can be passed through the first opening (3) together with a closing part (9) positioning this and closing the second opening (5), the connecting piece (12) being connected to the connecting part (32) via a connecting part (32) receiving the lines (34, 35) Housing (21) is rigidly connected. Abgasrückführventil nach Anspruch 7, dadurch gekennzeichnet, daß das Verbindungsteil (32) aus geprägten und zusammengefügten Blechteilen besteht, die fest mit dem Stutzen einerseits und dem Gehäuse (21) andererseits verbunden sind.Exhaust gas recirculation valve according to claim 7, characterized in that the connecting part (32) consists of embossed and joined sheet metal parts which are firmly connected to the connecting piece on the one hand and the housing (21) on the other hand. Abgasrückführventil nach Anspruch 8, dadurch gekennzeichnet, daß die Querschnittsverengung (43) am Stutzen (12) durch Verformung der Stutzenwandung hergestellt ist.Exhaust gas recirculation valve according to claim 8, characterized in that the cross-sectional constriction (43) on the connecting piece (12) is produced by deforming the connecting piece wall. Abgasrückführventil nach Anspruch 9, dadurch gekennzeichnet, daß der Stutzen (12) und das Schließteil (9) aus dünnwandigem Blech hergestellt sind und miteinander über eine Platte (11) fest und starr verbunden sind, die weiterhin der Verbindung des Stutzens mit dem Abgasrückführleitung (14) dient.Exhaust gas recirculation valve according to claim 9, characterized in that the connector (12) and the closing part (9) are made of thin-walled sheet metal and are rigidly and rigidly connected to one another via a plate (11) which further connects the connector to the exhaust gas recirculation line (14 ) serves. Abgasrückführventil nach Anspruch 10, dadurch gekennzeichnet, daß das Schließteil (9) eine Ausnehmung im Verlauf des Rohres bildet mit durch diese Ausnehmung in das Rohr (1) frei hineinragendem Stutzen (12).Exhaust gas recirculation valve according to claim 10, characterized in that the closing part (9) forms a recess in the course of the tube with a nozzle (12) projecting freely into the tube (1) through this recess. Abgasrückführventil zur Steuerung von Abgasrückführmengen, die der Saugseite einer Brennkraftmaschine zugeführt werden mit einem in ein Rohr (1) ragenden, mit dem Abgassammelsystem verbundenen und Teil einer Abgasrückführleitung (14) bildenden Stutzen (12), dessen stirnseitiger Mündung ein Ventilsitz (16) ausgebildet ist, mit dem ein von einer Stellantrieb (22) betätigtes Ventilglied (18) zusammenwirkt, dadurch gekennzeichnet, daß das Ventilglied (18) als Tellerventilglied ausgebildet ist mit einem Ventilteller (17) am Ende eines Ventilschaftes (19), der durch eine dem Stutzen (12) gegenüberliegende erste Öffnung (3) in der Wand des Rohres in das Rohr (1) ragt und der Stellantrieb (22) im Bereich der ersten Öffnung (3) mit seinem Gehäuse (21) mit dem Rohr starr und lösbar verbunden ist und das Gehäuse (21) über ein Verbindungsteil (32) eine starre Verbindung mit dem Stutzen (12) hat und der ersten Öffnung (3) gegenüberliegend eine zweite Öffnung (5) in der Wand des Rohres (1) vorgesehen ist, die durch ein Schließteil (9) verschließbar ist, das mit dem Stutzen (12) zu dessen Positionierung fest verbunden ist und zusammen mit diesem durch die erste Öffnung (3) in das Rohr (1) einsetzbar ist.Exhaust gas recirculation valve for controlling exhaust gas recirculation quantities, which are supplied to the suction side of an internal combustion engine, with a connection piece (12), which projects into a pipe (1) and is connected to the exhaust gas collection system and forms part of an exhaust gas recirculation line (14), the front end of which is designed as a valve seat (16) , with which a valve member (18) operated by an actuator (22) cooperates, characterized in that the valve member (18) is designed as a poppet valve member with a valve disk (17) at the end of a valve stem (19) which is connected to the connecting piece ( 12) opposite first opening (3) in the wall of the tube projects into the tube (1) and the actuator (22) in the area of the first opening (3) with its housing (21) with the Pipe is rigidly and detachably connected and the housing (21) has a rigid connection to the connector (12) via a connecting part (32) and a second opening (5) in the wall of the pipe (1) opposite the first opening (3). is provided, which can be closed by a closing part (9) which is firmly connected to the nozzle (12) for its positioning and can be inserted together with the latter through the first opening (3) into the tube (1). Abgasrückführventil nach Anspruch 12, dadurch gekennzeichnet, daß am Stutzen (12) eine Meßeinrichtung zur Erfassung von durch das Abgasrückführventil zugeführten Abgasmengen angeordnet ist und von der Meßeinrichtung über das Verbindungsteil (32) und den Gehäuse (21) des Stellantriebs (22) Leitungen (34, 35) zu einer Auswerteeinrichtung der von der Meßeinrichtung aufgenommenen Werten führt.Exhaust gas recirculation valve according to claim 12, characterized in that a measuring device for detecting exhaust gas quantities supplied through the exhaust gas recirculation valve is arranged on the connecting piece (12) and lines (34) from the measuring device via the connecting part (32) and the housing (21) of the actuator (22) , 35) leads to an evaluation device of the values recorded by the measuring device. Abgasrückführventil nach Anspruch 12 oder 13, dadurch gekennzeichnet, daß der Stutzen (12) und das Schließteil (9) aus dünnwandigem Blech hergestellt sind und miteinander über eine Platte (11) fest und starr verbunden sind, die weiterhin der Verbindung des Stutzens (12) mit dem Abgasrückführleitung (14) dient.Exhaust gas recirculation valve according to claim 12 or 13, characterized in that the connecting piece (12) and the closing part (9) are made of thin-walled sheet metal and are rigidly and rigidly connected to one another via a plate (11) which furthermore connects the connecting piece (12). with the exhaust gas recirculation line (14). Abgasrückführventil nach Anspruch 14, dadurch gekennzeichnet, daß das Verbindungsteil (32) aus geprägten und zusammengefügten Blechteilen besteht, die fest mit dem Stutzen einerseits und dem Gehäuse andererseits verbunden sind.Exhaust gas recirculation valve according to claim 14, characterized in that the connecting part (32) consists of embossed and joined sheet metal parts which are firmly connected to the nozzle on the one hand and the housing on the other. Abgasrückführventil nach Anspruch 15, dadurch gekennzeichnet, daß das Schließteil (9) eine Ausnehmung im Verlauf des Rohres (1) bildet mit durch diese Ausnehmung frei in das Rohr hineinragendem Stutzen (12).Exhaust gas recirculation valve according to claim 15, characterized in that the closing part (9) forms a recess in the course of the tube (1) with a nozzle (12) which projects freely into the tube through this recess. Abgasrückführventil nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß das Rohr (1) Teil des Luftansaugsystems der Brennkraftmaschine ist.Exhaust gas recirculation valve according to one of the preceding claims, characterized in that the tube (1) is part of the air intake system of the internal combustion engine. Abgasrückführventil nach Anspruch 16, dadurch gekennzeichnet, daß das den Stellantrieb (22) aufnehmende Gehäuse (21) aus Kunststoff gefertigt sind.Exhaust gas recirculation valve according to claim 16, characterized in that the housing (21) receiving the actuator (22) is made of plastic.
EP95115121A 1994-11-18 1995-09-26 Exhaust gas recirculation valve Expired - Lifetime EP0717185B1 (en)

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DE4441091A DE4441091A1 (en) 1994-11-18 1994-11-18 Exhaust gas recirculation valve
DE4441091 1994-11-18

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EP0717185B1 EP0717185B1 (en) 1998-03-25

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DE59501699D1 (en) 1998-04-30
EP0717185B1 (en) 1998-03-25
US5609143A (en) 1997-03-11
DE4441091A1 (en) 1996-05-23
JPH08210197A (en) 1996-08-20

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