EP0717185B1 - Exhaust gas recirculation valve - Google Patents

Exhaust gas recirculation valve Download PDF

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Publication number
EP0717185B1
EP0717185B1 EP95115121A EP95115121A EP0717185B1 EP 0717185 B1 EP0717185 B1 EP 0717185B1 EP 95115121 A EP95115121 A EP 95115121A EP 95115121 A EP95115121 A EP 95115121A EP 0717185 B1 EP0717185 B1 EP 0717185B1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
pipe
gas recirculation
recirculation valve
valve according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95115121A
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German (de)
French (fr)
Other versions
EP0717185A1 (en
Inventor
Gerhard Dipl.-Ing. Schellenberg (Fh)
Johannes Dr.-Ing. Meiwes
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Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Publication date
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Publication of EP0717185A1 publication Critical patent/EP0717185A1/en
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Publication of EP0717185B1 publication Critical patent/EP0717185B1/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52Systems for actuating EGR valves
    • F02M26/55Systems for actuating EGR valves using vacuum actuators
    • F02M26/58Constructional details of the actuator; Mounting thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/18Thermal insulation or heat protection
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/21Arrangement 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/45Sensors specially adapted for EGR systems
    • F02M26/46Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
    • F02M26/47Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition the characteristics being temperatures, pressures or flow rates
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65Constructional details of EGR valves
    • F02M26/66Lift valves, e.g. poppet valves
    • F02M26/68Closing members; Valve seats; Flow passages
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/45Sensors specially adapted for EGR systems
    • F02M26/48EGR valve position sensors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65Constructional details of EGR valves
    • F02M26/72Housings

Definitions

  • the invention relates to an exhaust gas recirculation valve according to claim 1 off.
  • a pipe part is provided that as an adapter for use in an air line is designed.
  • the pipe part points to one Side an opening in the pipe wall through which a with of the exhaust gas recirculation line connected inside the Tube is insertable.
  • This nozzle has a flange over which it is sealed with a flange surrounding the opening is connected.
  • a guide socket is formed for tight guidance a stem, at the end of which a valve disk is attached that cooperates with the opening of the nozzle.
  • the shaft is at its end protruding from the tube connected to a pneumatic actuator.
  • This exhaust valve must on the one hand in a complex manner in the air line the internal combustion engine to be fitted, and on the other it is to assemble with a complex assembly work.
  • Such exhaust gas recirculation valves are used for metering Exhaust gas recirculation quantities caused by opening or closing the exhaust valve can be controlled via the actuator. For exact It is also dosing the exhaust gas recirculation quantities necessary to measure the recirculated exhaust gas quantities. Only then can the exhaust gas recirculation quantities be precisely regulated respectively. Ultimately, such a measurement also gives Conclusion about the functionality of the exhaust gas recirculation valve. Such a device is in the known exhaust gas recirculation valve not provided.
  • the exhaust gas recirculation valve according to the invention has the advantage that a measurement of exhaust gas recirculation quantities is possible and that is also one of the actual inflow point of recirculated exhaust gas immediately adjacent Point is used to record the exhaust gas recirculation quantities.
  • the exhaust gas recirculation quantity via the nozzle is introduced directly into the fresh air flow the advantage that the measuring point by the air flow on very is effectively cooled without additional measures must be taken. This ensures the security of the measurement improved.
  • valve member together with its actuator an opening provided in the tube can be used while doing so at the same time a connection can be established with the measuring point on the nozzle.
  • the actuator and valve member are easy to pre-assemble and simple into the tube, which is part of the intake system of the Internal combustion engine can be used.
  • the pipe can on the other hand, a further part of the exhaust gas recirculation line be, with the same advantageous mounting options surrender.
  • the valve member and the nozzle is combined into one structural unit, so that this unit in a simple way from one side the pipe can be used in pre-assembled form.
  • the exhaust gas recirculation valve is not connected to a measuring point on Is provided.
  • the development according to claim 3 has the advantage that the recording of the measured variables and their evaluation on separate Places can be done. According to patent claim 3 the evaluation device outside the pipe to the actuator assigned. This avoids long line connections and has the advantage of being compact.
  • claim 4 is as a device for receiving the Measured values for the exhaust gas recirculation quantities a cross-sectional narrowing provided on the exhaust pipe, and it will be the Pressures detected upstream and downstream of the cross-sectional constriction evaluated.
  • This can either be arranged locally on the nozzle Pressure sensors take place or take place in that 5 control openings upstream and downstream the cross-sectional constriction are provided, which prevail there Pressure via pipes to the evaluation device on Forward actuator.
  • These pipelines can in a particularly advantageous manner according to claim 7 in the connecting part connecting the actuator to the nozzle be integrated. This results in a special one compact unit that is very easy to fit into one can install existing pipe on the internal combustion engine.
  • FIG. 1 shows a first longitudinal section through the pipe together with the exhaust gas recirculation valve and FIG. 2 a section perpendicular to the representation of Figure 1.
  • a pipe 1 which is part of an air intake system Internal combustion engine can be or in one version with a smaller diameter part of an exhaust gas recirculation line can be.
  • This tube has one in its peripheral wall first pipe socket 2, which has a first opening 3 in the Wall of the tube 1 forms and the first pipe socket 2 diametrically opposite a second pipe socket 4, the forms a second opening 5 in the wall of the tube 1.
  • the diameter of the first opening 3 is larger than that Diameter of the second opening 5.
  • the second pipe socket 4 is drawn in at its extreme outer end Formation of an annular, pointing inside the tube 1 Shoulder 7.
  • a liner Seal 8 is a closing part 9 formed from sheet metal with a flange-shaped radially outward-facing formation 10 for Investment.
  • the locking part is thereby forming a recess formed approximately frustoconical in the course of the tube and at its opposite the formation 10 End firmly connected to a plate 11, for.
  • the nozzle 12 protrudes diametrically and coaxially to the first opening 3 and second opening 5 into the tube 1 and instructs a valve seat at its inner end on the front side 16 on which a valve plate 17 of a valve member 18 of the Exhaust gas recirculation valve according to the invention comes to the plant.
  • the Valve plate sits at the end of one valve stem 19, the other End in a housing 21 of an actuator 22 out is. This is with its housing 22 under tight Closure of the opening 3 used in the first pipe socket 2.
  • the actuator is in the example shown from a pneumatically working pressure can with a adjusting membrane 23 clamped between housing halves, with the end 25 of the valve stem by suitable means 24 connected is.
  • These means include a dimensionally stable spring plate 26, which is used to fix the molded neck of the Control membrane 23 has a blind hole 27 into which the valve stem is pressed in with a fir tree profile.
  • the connector 36 and the housing 21 of the actuator 22 are made in two parts and successively inserted into the opening 3 of the first pipe socket will. Corresponding seals are between these two parts required.
  • the connector 36 then has an axial opening 39 which is so large that the valve plate 17 can be passed. After touchdown the housing 21 of the actuator is then again the tube 1 is tightly sealed to the outside.
  • the implementation of the valve stem to the control membrane not be completely sealed, since between the diaphragm 23 and Part of the valve stem on the valve side is connected to the environment Reference pressure space is available.
  • the connecting part is preferably made of embossed Sheet metal parts assembled. Also the closing part 9 and the neck 12 are preferably stamped from sheet metal. Against that in the case where in particular the pipe 1 for feeding of air with exhaust gas supplied via the exhaust valve, the housing 21 of the actuator 22 injection molded plastic parts exist because of the intensive cooling the supplied air flow the supplied via the exhaust gas recirculation Heat is quickly transported away. Even the connecting part 32, especially in the event that electronic Pressure transducers on the nozzle are also provided optimally cooled by the passing air, so that here the best conditions for a measured value recording at low Requirements for the transmitter are possible. Advantageous here is the funnel-shaped design of the Closing part 9, which has an even longer flushing length for allows the nozzle 12.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Analytical Chemistry (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Fluid-Driven Valves (AREA)

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 relates to an exhaust gas recirculation valve according to claim 1 off. In such a known from DE-C 43 25 169 Exhaust gas recirculation valve, a pipe part is provided that as an adapter for use in an air line is designed. The pipe part points to one Side an opening in the pipe wall through which a with of the exhaust gas recirculation line connected inside the Tube is insertable. This nozzle has a flange over which it is sealed with a flange surrounding the opening is connected. Opposite the neck is in the wall of the tube a guide socket is formed for tight guidance a stem, at the end of which a valve disk is attached that cooperates with the opening of the nozzle. The shaft is at its end protruding from the tube connected to a pneumatic actuator. This exhaust valve must on the one hand in a complex manner in the air line the internal combustion engine to be fitted, and on the other it is to assemble with a complex assembly work. Such exhaust gas recirculation valves are used for metering Exhaust gas recirculation quantities caused by opening or closing the exhaust valve can be controlled via the actuator. For exact It is also dosing the exhaust gas recirculation quantities necessary to measure the recirculated exhaust gas quantities. Only then can the exhaust gas recirculation quantities be precisely regulated respectively. Ultimately, such a measurement also gives Conclusion about the functionality of the exhaust gas recirculation valve. Such a device is in the known exhaust gas recirculation valve not provided.

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 is also one of the actual inflow point of recirculated exhaust gas immediately adjacent Point is used to record the exhaust gas recirculation quantities. In particular, if the exhaust gas recirculation quantity via the nozzle is introduced directly into the fresh air flow the advantage that the measuring point by the air flow on very is effectively cooled without additional measures must be taken. This ensures the security of the measurement improved.

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 Verbindunc 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 the patent claim 2 is the valve member together with its actuator an opening provided in the tube can be used while doing so at the same time a connection can be established with the measuring point on the nozzle. This has the advantage that the actuator and valve member are easy to pre-assemble and simple into the tube, which is part of the intake system of the Internal combustion engine can be used. The pipe can on the other hand, a further part of the exhaust gas recirculation line be, with the same advantageous mounting options surrender. In further training of this configuration is according to claim 7 of the actuator, the valve member and the nozzle is combined into one structural unit, so that this unit in a simple way from one side the pipe can be used in pre-assembled form. This is particularly advantageous according to claim 12, if the exhaust gas recirculation valve is not connected to a measuring point on Is provided.

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 on separate Places can be done. According to patent claim 3 the evaluation device outside the pipe to the actuator assigned. This avoids long line connections and has the advantage of being compact.

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 gemäß 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 is as a device for receiving the Measured values for the exhaust gas recirculation quantities a cross-sectional narrowing provided on the exhaust pipe, and it will be the Pressures detected upstream and downstream of the cross-sectional constriction evaluated. This can either be arranged locally on the nozzle Pressure sensors take place or take place in that 5 control openings upstream and downstream the cross-sectional constriction are provided, which prevail there Pressure via pipes to the evaluation device on Forward actuator. These pipelines can in a particularly advantageous manner according to claim 7 in the connecting part connecting the actuator to the nozzle be integrated. This results in a special one compact unit that is very easy to fit into one can install existing pipe on the internal combustion engine. Particular advantages result from the fact that these compact unit also according to claim 17 in the air intake system the internal combustion engine can be installed, the Exhaust gas recirculation leading nozzle is optimally cooled together with any provided pressure sensors directly on Support. Furthermore, the actuator is not in this case more exposed to the hot exhaust gas, but is also cooled by the flowing air in the air intake pipe, that the actuator can be built from molded plastic parts can do what 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 in the drawing shown and is described in more detail in the following description explained. 1 shows a first longitudinal section through the pipe together with the exhaust gas recirculation valve and FIG. 2 a section perpendicular to the representation of Figure 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 embodiment shown in the drawing a pipe 1 is shown, which is part of an air intake system Internal combustion engine can be or in one version with a smaller diameter part of an exhaust gas recirculation line can be. This tube has one in its peripheral wall first pipe socket 2, which has a first opening 3 in the Wall of the tube 1 forms and the first pipe socket 2 diametrically opposite a second pipe socket 4, the forms a second opening 5 in the wall of the tube 1. Of the The diameter of the first opening 3 is larger than that Diameter of the second opening 5. The second pipe socket 4 is drawn in at its extreme outer end Formation of an annular, pointing inside the tube 1 Shoulder 7. On this comes a liner Seal 8 is a closing part 9 formed from sheet metal with a flange-shaped radially outward-facing formation 10 for Investment. The locking part is thereby forming a recess formed approximately frustoconical in the course of the tube and at its opposite the formation 10 End firmly connected to a plate 11, for. B. soldered to which is also concentric to the locking part 9 on the inside the end of a nozzle 12 is attached. This can also be soldered to the plate and encloses one Through hole 13 of the plate, which has an equal diameter Passage to the diameter of a flanged to the plate 11 Return line 14 forms.

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 nozzle 12 protrudes diametrically and coaxially to the first opening 3 and second opening 5 into the tube 1 and instructs a valve seat at its inner end on the front side 16 on which a valve plate 17 of a valve member 18 of the Exhaust gas recirculation valve according to the invention comes to the plant. Of the Valve plate sits at the end of one valve stem 19, the other End in a housing 21 of an actuator 22 out is. This is with its housing 22 under tight Closure of the opening 3 used in the first pipe socket 2. The actuator is in the example shown from a pneumatically working pressure can with a adjusting membrane 23 clamped between housing halves, with the end 25 of the valve stem by suitable means 24 connected is. These means include a dimensionally stable spring plate 26, which is used to fix the molded neck of the Control membrane 23 has a blind hole 27 into which the valve stem is pressed in 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.In the enclosed by the control membrane 23 in the housing 21 Work space 28, a return spring 29 is clamped, which is supported between the spring plate and the housing. The work space 29 is the corresponding one via a pressure line 30 Control pressure supplied.

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 the figure 1 can be seen in a different section from FIG. 2, that the nozzle 12 together with the closing part 9 and plate 11 via a connecting part 32 to the housing 21 of the actuator 22 is connected. This connecting part consists of a part 33 comprising the nozzle 12 from the outside, in the a first pipe 34 and a second pipe 35 are included. These pipes are offset to the socket 12, parallel to the axis, to the first opening 3 there and open into a connector 36, which in turn again with the housing 21 or via this with the Pipe socket is connected. Between this and the housing 21 pressure spaces 37 and 38 are included, the connection to an evaluation device, not shown the pressure difference between those across the first pipe 34 in the pressure chamber 37 and via the second pipe 35 have in the pressure chamber 38 pressures. The first and the second pipe 34, 35 are fixed to the Connecting part 32 and the housing 21 connected so that this together with the nozzle 12, the closing part 9 and Plate 11 form a part to be handled together such that this part through the first opening 3 into the Tube 1 can be inserted and out of this again partly led out again through the second opening 5 can be until the closing part 9 on the seal 8 the annular shoulder 7 comes to rest. In this Point then has the housing 21 of the actuator 22 also first opening 3 tightly closed. That way can the exhaust gas recirculation valve in a very simple manner use the tube 1, which considerably simplifies assembly and also the cost of executing the exhaust gas recirculation valve lowers.

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 connector 36 and the housing 21 of the actuator 22 are made in two parts and successively inserted into the opening 3 of the first pipe socket will. Corresponding seals are between these two parts required. The connector 36 then has an axial opening 39 which is so large that the valve plate 17 can be passed. After touchdown the housing 21 of the actuator is then again the tube 1 is tightly sealed to the outside. However, it does the implementation of the valve stem to the control membrane not be completely sealed, since between the diaphragm 23 and Part of the valve stem on the valve side is connected to the environment Reference pressure space is available.

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.It is with an exhaust gas recirculation valve designed in this way possible to measure the exhaust gas recirculation quantity supplied by between the mouth 40 of the first pipeline 34 into the interior of the connector 12 and the mouth 41 of the second pipeline 35 a narrowing of the diameter inside the nozzle 43 is provided, through which between upstream and a differential pressure downstream of the same nozzle areas is formed, which is dependent in a known manner of the amount flowing through, in this case the amount flowing through Exhaust gas recirculation quantity. 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 in place and Be detected by electronic pressure transducers, the Measured values over connecting lines, in a comparatively trained connecting part 32 to the actuator 22 out there and there a corresponding Control device are supplied.

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, especially when executing the in the type shown in Figure 2, is preferably made of embossed Sheet metal parts assembled. Also the closing part 9 and the neck 12 are preferably stamped from sheet metal. Against that in the case where in particular the pipe 1 for feeding of air with exhaust gas supplied via the exhaust valve, the housing 21 of the actuator 22 injection molded plastic parts exist because of the intensive cooling the supplied air flow the supplied via the exhaust gas recirculation Heat is quickly transported away. Even the connecting part 32, especially in the event that electronic Pressure transducers on the nozzle are also provided optimally cooled by the passing air, so that here the best conditions for a measured value recording at low Requirements for the transmitter are possible. Advantageous here is the funnel-shaped design of the Closing part 9, which has an even longer flushing length for allows the nozzle 12.

Claims (18)

  1. Exhaust gas recirculation valve for controlling exhaust gas recirculation quantities which are supplied to the induction side of an internal combustion engine, having a stub pipe (12) which protrudes into a pipe (1), which is connected to the exhaust gas collecting system, which forms part of an exhaust gas recirculation conduit (14) and on whose end-face opening is formed a valve seat (16) with which a valve element (18) actuated by an actuator (22) interacts, characterized in that at least one part of a measuring device in the form of a measurement recording device for recording exhaust gas quantities supplied through the exhaust gas recirculation valve is arranged on the stub pipe (12) upstream of the opening into the pipe (1).
  2. Exhaust gas recirculation valve according to Claim 1, characterized in that the valve element (18) is configured as a disc valve element with a valve disc (17) at the end of a valve stem (19) which protrudes into the pipe (1) through an opening (3), opposite the stub pipe (12), in the wall of the pipe and the actuator (22) is releasably connected to the pipe in the region of the opening (3) and has a permanent connection to that part (32) on the stub pipe (12) which forms at least part of the measuring device.
  3. Exhaust gas recirculation valve according to Claim 1 or 2, characterized in that an analysis device for the measurement recorded is associated, as another part of the measuring device, with the actuator (22).
  4. Exhaust gas recirculation valve according to Claim 3, characterized in that the measurement recording device is a cross-sectional contraction (43) which is arranged in the stub pipe (12) upstream of the valve seat (16), respective pressure recorders (40, 41) being arranged in the wall of the stub pipe upstream and downstream of the contraction, which pressure recorders (40, 41) are connected by respective conduits (34, 35) to the casing of the actuator (22), which casing is connected to the pipe and the analysis device.
  5. Exhaust gas recirculation valve according to Claim 4, characterized in that the pressure recorders are openings (40, 41) in the wall of the stub pipe from pipe conduits (34, 35) which are connected to the analysis device by means of the casing (21) of the actuator (22) and the analysis device contains a differential pressure sensor.
  6. Exhaust gas recirculation valve according to Claim 5, characterized in that the analysis device is integrated in the casing (21).
  7. Exhaust gas recirculation valve according to Claims 3 to 6, characterized in that a second opening (5), diametrically opposite the opening in the wall of the pipe (1), considered as a first opening (3), is provided in the wall of the pipe (1), and the stub pipe (12), together with a closing part (9) positioning the stub pipe (12) and closing the second opening (5), can be fed through the first opening (3), the stub pipe (12) being rigidly connected to the casing (21) by means of a connecting part (32) accommodating the conduits (34, 35).
  8. Exhaust gas recirculation valve according to Claim 7, characterized in that the connecting part (32) consists of stamped sheet-metal parts joined together, which parts are permanently connected to the stub pipe, on the one hand, and to the casing (21), on the other.
  9. Exhaust gas recirculation valve according to Claim 8, characterized in that the cross-sectional contraction (43) on the stub pipe (12) is manufactured by deforming the stub pipe wall.
  10. Exhaust gas recirculation valve according to Claim 9, characterized in that the stub pipe (12) and the closing part (9) are manufactured from thin-walled sheet metal and are permanently and rigidly connected together by means of a plate (11) which is also used for connecting the stub pipe to the exhaust gas recirculation conduit (14).
  11. Exhaust gas recirculation valve according to Claim 10, characterized in that the closing part (9) forms a recess in the run of the pipe with the stub pipe (12) freely protruding into the pipe (1) through this recess.
  12. Exhaust gas recirculation valve according to Claim 2, characterized in that a second opening (5), opposite to the first opening (3), is provided in the wall of the pipe (1), which opening (5) can be closed by a closing part (9) which is permanently connected to the stub pipe (12) to position the latter and, together with the stub pipe (12), can be inserted into the pipe (1) through the first opening (3).
  13. Exhaust gas recirculation valve according to Claim 12, characterized in that conduits (34, 35) lead from that part of the measuring device which is on the stub pipe via a connecting part (32) and the casing (21) of the actuator (22) to an analysis device for the values recorded by the measuring device.
  14. Exhaust gas recirculation valve according to Claim 12 or 13, characterized in that the stub pipe (12) and the closing part (9) are manufactured from thin-walled sheet metal and are permanently and rigidly connected together by means of a plate (11) which is also used for connecting the stub pipe (12) to the exhaust gas recirculation conduit (14).
  15. Exhaust gas recirculation valve according to Claim 14, characterized in that the connecting part (32) consists of stamped sheet-metal parts joined together, which parts are permanently connected to the stub pipe, on the one hand, and to the casing, on the other.
  16. Exhaust gas recirculation valve according to Claim 15, characterized in that the closing part (9) forms a recess in the run of the pipe (1) with the stub pipe (12) freely protruding into the pipe through this recess.
  17. Exhaust gas recirculation valve according to one of the preceding claims, characterized in that the pipe (1) is part of the air induction system of the internal combustion engine.
  18. Exhaust gas recirculation valve according to Claim 16, characterized in that the casing (21) accommodating the actuator (22) is manufactured from plastic.
EP95115121A 1994-11-18 1995-09-26 Exhaust gas recirculation valve Expired - Lifetime EP0717185B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4441091 1994-11-18
DE4441091A DE4441091A1 (en) 1994-11-18 1994-11-18 Exhaust gas recirculation valve

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EP0717185A1 EP0717185A1 (en) 1996-06-19
EP0717185B1 true EP0717185B1 (en) 1998-03-25

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EP95115121A Expired - Lifetime EP0717185B1 (en) 1994-11-18 1995-09-26 Exhaust gas recirculation valve

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US (1) US5609143A (en)
EP (1) EP0717185B1 (en)
JP (1) JPH08210197A (en)
DE (2) DE4441091A1 (en)

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US5609143A (en) 1997-03-11
EP0717185A1 (en) 1996-06-19
DE59501699D1 (en) 1998-04-30
DE4441091A1 (en) 1996-05-23
JPH08210197A (en) 1996-08-20

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