EP0857252B1 - Exhaust gas return valve - Google Patents

Exhaust gas return valve Download PDF

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Publication number
EP0857252B1
EP0857252B1 EP96934428A EP96934428A EP0857252B1 EP 0857252 B1 EP0857252 B1 EP 0857252B1 EP 96934428 A EP96934428 A EP 96934428A EP 96934428 A EP96934428 A EP 96934428A EP 0857252 B1 EP0857252 B1 EP 0857252B1
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EP
European Patent Office
Prior art keywords
exhaust
gas recirculation
valve
exhaust gas
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
EP96934428A
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German (de)
French (fr)
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EP0857252A1 (en
Inventor
Erwin Krimmer
Bruno Hezel
Eberhard Wizgall
Tilman Miehle
Peter Jauernig
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP0857252A1 publication Critical patent/EP0857252A1/en
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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
    • F02M26/59—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor
    • F02M26/61—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor in response to exhaust pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/66—Lift valves, e.g. poppet valves
    • F02M26/67—Pintles; Spindles; Springs; Bearings; Sealings; Connections to actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/66—Lift valves, e.g. poppet valves
    • F02M26/68—Closing members; Valve seats; Flow passages

Definitions

  • the invention relates to an exhaust gas recirculation valve according to the Genus of claim 1.
  • DE-A-43 38 194 known exhaust gas recirculation valve is the Valve seat designed as a conical seat, which in the Interior of the exhaust gas return line points. Comes on this seat a conical valve member to the system, which by the Force of the spring is brought into the closed position and through the electromagnetic force of the electromagnet from Valve seat is lifted off.
  • Such a valve has the Disadvantage that it is due to the exhaust gas pressure in the closed position Closing direction is applied, so that considerable forces are necessary, especially in addition with negative pressure in the Pipe to bring the valve into the open position. This requires a large electromagnet and a high one Energy generated by appropriately developed power amplifiers must be provided costly.
  • the exhaust gas recirculation valve according to the invention with the features the license plate has the advantage that on Valve member by providing the movable wall a compensation of the exhaust gas pressures acting on the valve member can be achieved. Accordingly, they are Operating forces that keep the valve in the open position should bring, only slightly, so that a quick and accurate Switching the exhaust gas recirculation valve is possible. It can also the electromagnet should be small and small Energy use can be operated. It is correspondingly small the effort for an electrical control stage for the Winding the electromagnet. In a particularly advantageous way Way, the exhaust gas recirculation valve by analog or quasi-analog control, clocked with variable Duty cycle, are held in intermediate positions.
  • connection of the Control room via a through the valve stem Channel so that a direct connection without separate Line routing between exhaust gas recirculation line and control room is realized.
  • This builds especially small with lighter Mountability and low sources of error.
  • For the Pressure equalization is in particular according to claim 3 acted upon by the exhaust gas pressure in the closing direction of the valve Area of the valve member substantially the same size as that surface of the valve member acting in the opening direction movable wall. By dimensioning this area can change the closing force when the electromagnet is not energized or the opening force of the electromagnet exactly can be set.
  • the movable wall consists of a membrane.
  • the movable one Wall formed as a piston with what a failure such as when using a membrane can be possible, is safely avoided here.
  • design can be very precise Area to be determined that is compensating for the exhaust gas pressure acts on the valve member in the closing direction of the valve.
  • upstream wall directs one Inflow of exhaust gas to the mouth, so that exhaust gas only crosswise with a pressure that corresponds to the static pressure in the Exhaust gas recirculation line corresponds to enter the duct can.
  • the kind of Opening of the nozzle in the pipe according to claim 12 has the advantage that the nozzle itself intensely by cooling air is flushed in the pipe and the Introduction of exhaust gas in the area of the flow profile in the pipe takes place, which has the highest speed and thus a very fast, even swirling of exhaust gas with supplied air allows.
  • the mouth immediately adjacent to the Throttle valve controlling the flow cross-section of the pipe moved so the different positions Throttle this cooling and swirling effect be intensified.
  • Figure 1 shows a first Embodiment of the exhaust gas recirculation valve with a membrane as a movable wall
  • Figure 2 shows a second embodiment of the exhaust gas recirculation valve with a piston as a movable one Wall.
  • a tube 1 is shown, for example part of an intake system of an internal combustion engine.
  • a first opening 3 In the Wall 2 of the tube 1 are a first opening 3 and this diametrically opposite a second opening 4 is provided.
  • An exhaust gas recirculation line 6 opens via the first opening 3 into tube 1.
  • a connector 8 is provided in the interior of the tube protrudes through the opening 3.
  • the nozzle 8 can for example be formed as a drawn part from sheet metal and has a flange 9 on the outside, which together with a Flange 10 of the exhaust gas recirculation line and one corresponding flange, not shown, of the tube 1 is screwed so that the transition from Exhaust gas recirculation line and nozzle is tightly closed.
  • the Spigot is spaced through the opening 3 led to the production of thermal insulation, especially when the tube 1 is made of plastic is.
  • the nozzle On the cylindrical part 11 protruding through the opening 3 the nozzle is followed by a conical part 12 which forms a valve seat 13, the seat surface inside the Nozzle or to the exhaust gas recirculation line is directed. Then goes to the valve seat 13 Neck in a pipe part 14 with a reduced diameter about that just before the axis of the tube 1 in has the tube 1.
  • a valve member 15 cooperates with the valve seat 13, the has a conical sealing surface 16 and at the end of a Valve stem 17 is attached.
  • This valve stem is in a bore 18 guided tightly into the core 19 of a Electromagnet 20 is introduced axially.
  • the core is 19 with a nozzle 21 in the second opening 4 and in not further shown also tight with the tube 1 connected.
  • the core carries a magnetic winding 22 which within the housing 24 receiving the electromagnet is arranged.
  • a submersible anchor 25 cooperates with the core essentially circular cylindrical shape together, which at Excitation of the magnetic winding in an axial recess 26 of the Kerns 19 immersed.
  • the ring wall surrounding the recess 26 27 of the core increases with increasing immersion depth Cross section too. In this way, one Linear characteristic of the electromagnet achieved. opposite the magnetic force that forces the armature into the recess 26 pulls, a compression spring 29 acts between the armature 25 and Magnetic core 19 is clamped and guided on the valve stem 17 becomes.
  • the valve stem 17 penetrates, as already above listed, coaxial with the magnetic core 19 and carries on his End the anchor 25.
  • the Valve stem on an outer ring shoulder 30 which from the tube 1 is directed away and the magnetic core 25 has a bore 31, by means of it on the reduced diameter part 32 of the valve stem up to the shoulder 30 is pushed. In this position he is through Lock nuts 33 fixed on the valve stem 17.
  • the anchor can also be pressed onto the valve stem.
  • Between the end face 34 and the lock nuts 33 is one Washer 35 is provided between the and the end face 34 a membrane 36 is clamped on its Outer periphery 37 between a flange 38 of the housing 24 and a lid 39 is sealed.
  • Control room 41 in which only one channel 42 opens, the is passed coaxially through the valve stem and on the other hand, it cannot be closed inside the socket 8 opens upstream of the valve seat 13.
  • Control room 41 opposite side delimits the membrane a pressure chamber 44, which via a first channel 46 in the Anchor 25 and a second channel 47 in the core 19 with the Inside the tube 1 is connected so that it cannot be closed.
  • the pipe 1 is immediately adjacent to the Nozzle 8 arranged a throttle valve 49 so that it from full open position, as shown, in a fully closed Position of the tube can be brought.
  • the free effective diameter of the membrane 36, the pressure in Control chamber 41, on the one hand, and the pressure in pressure chamber 44 on the other hand, is essentially the same size as the effective in the closing direction of the valve member 15 from Pressure in the exhaust gas recirculation line acted on the diameter of the valve member 14.
  • Exhaust gas pressure in the opening direction essentially to one same area as the area caused by the exhaust gas pressure is acted upon in the closing direction. They stand out Exhaust gas forces on the valve member.
  • the degree of compensation can be varied by the choice of the areas applied become.
  • the energy supply for such a magnet is little effort both in terms of energy production and with regard to the required control output stages of a electronic control device.
  • a pressure increase in the Avoid control room 41 due to dynamic Inflow of the exhaust gas emerging at the exhaust gas recirculation valve can arise is the mouth 50 of the channel 42, the is centered on the valve member 15 by a Shield cap 51 protected.
  • This cap has one of the Mouth axially upstream wall that serves as a baffle for the incoming exhaust gas flow serves.
  • By side Openings 53 can then the exhaust gas for pressure formation in the Enter control room 41. This is done from a flow-reduced zone within the cap 51 with a Pressure equal to the static pressure of the exhaust gas in the Exhaust gas recirculation line is.
  • the type of introduction of the exhaust gas pressure into the control room 41 is particularly advantageous due to the one provided here Channel 42 in the valve stem 17. Because of this configuration are no separate line connections between Exhaust gas recirculation line and the control room 41 necessary in the otherwise additional connection effort and Sealing effort with the possibility of a damage event would bring himself. Of course it is also possible instead of Channel that goes through the valve stem, one accordingly to provide another connection, e.g. B. in the form of a Exhaust gas recirculation valve housing and pipe for Exhaust gas recirculation line duct or a separate Lead there.
  • the valve construction described is to a high degree damage-proof, such that in the event of a break the Membrane 36 the force balance by the exhaust gas pressure in the Control room 41 is omitted, which means that the Exhaust gas pressure increases on the valve member 15 in the Closing direction works. Under no circumstances can one high exhaust gas recirculation can be set what the Operability of an associated internal combustion engine receives. Even if the magnet is too high due to Exhaust gas pressure forces should no longer be able work properly or even open the valve, there is still a small amount of exhaust gas recirculation via the Channel 42, the control room 41, the channels 46 and 47 in the Tube 1. In no case does the break occur Membrane exhaust into the environment.
  • Exhaust gas recirculation valve according to Figure 2 are essentially same parts as in the embodiment of Figure 1 intended. Deviating from this is that in the magnetic core part of armature 125 facing away from piston 136, which forms a movable wall to replace the membrane, by the piston sliding tightly in a bore 61 while doing so with a housing cover 139 in turn a control room 141 tightly encloses.
  • the piston 136 separates it Control room 141 from a pressure room 144, which in its Design is the same as the pressure chamber 44 from Embodiment according to Figure 1.
  • the bore 61 is there provided in a housing part that does not consist of magnetizable material, preferably in the form a brass sleeve 65, which is firmly inserted into the housing is so that the piston is unaffected by the magnet is easily movable within this range.
  • a housing part that does not consist of magnetizable material, preferably in the form a brass sleeve 65, which is firmly inserted into the housing is so that the piston is unaffected by the magnet is easily movable within this range.
  • the Example In its in the closed position shown in FIG Face 66 of the piston to a seal 67, the Example is used on the lid 139, such that the Control chamber 141 is sealed off to guide the piston, when the exhaust gas recirculation valve is in its closed position located.
  • Piston 136 may also have an axial, as shown Recess 68 may be provided, in which derr 42 opens and which is filled in by a soot filter. This too avoids contamination of the guide of the piston 136 in the sleeve 65.
  • this embodiment has the essential advantage that with a case of damage, such as the rupture of the membrane of Figure 1, does not have to be calculated here. The valve has thus a much higher life expectancy.
  • a shield cap 51 is also provided, which prevents that a dynamic exhaust pressure in the control room 141st reached.

Description

Stand der TechnikState of the art

Die Erfindung geht von einem Abgasrückführventil gemäß der Gattung des Patentanspruchs 1 aus. Bei einem solchen, durch die DE-A-43 38 194 bekannten Abgasrückführventil ist der Ventilsitz als kegelförmiger Sitz ausgebildet, der in das Innere der Abgsrückführleitung weist. Auf diesem Sitz kommt ein kegelförmiges Ventilglied zur Anlage, das durch die Kraft der Feder in Schließstellung gebracht wird und durch die elektromagnetische Kraft des Elektromagneten vom Ventilsitz abgehoben wird. Ein solches Ventil hat den Nachteil, daß es durch den Abgasdruck bei Schließstellung in Schließrichtung beaufschlagt wird, so daß erhebliche Kräfte notwendig sind, insbesondere zusätzlich bei Unterdruck im Rohr, das Ventil in Öffnungsstellung zu bringen. Dies erfordert einen großbauenden Elektromagneten und eine hohe Energie, die durch entsprechend ausgebaute Endstufen kostenträchtig bereitgestellt werden muß.The invention relates to an exhaust gas recirculation valve according to the Genus of claim 1. With such, by DE-A-43 38 194 known exhaust gas recirculation valve is the Valve seat designed as a conical seat, which in the Interior of the exhaust gas return line points. Comes on this seat a conical valve member to the system, which by the Force of the spring is brought into the closed position and through the electromagnetic force of the electromagnet from Valve seat is lifted off. Such a valve has the Disadvantage that it is due to the exhaust gas pressure in the closed position Closing direction is applied, so that considerable forces are necessary, especially in addition with negative pressure in the Pipe to bring the valve into the open position. This requires a large electromagnet and a high one Energy generated by appropriately developed power amplifiers must be provided costly.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Abgasrückführventil mit den Merkmalen des Kennzeichens hat demgegenüber den Vorteil, daß am Ventilglied durch die Bereitstellung der beweglichen Wand ein Ausgleich der auf das Ventilglied wirkenden Abgasdrücke erzielt werden kann. Dementsprechend sind die Betätigungskräfte, die das Ventil in Öffnungsstellung bringen sollen, nur gering, so daß ein schnelles und exaktes Schalten des Abgasrückführventils möglich ist. Zudem kann der Elektromagnet kleinbauend sein und mit einem geringen Energieeinsatz betrieben werden. Entsprechend klein ist auch der Aufwand für eine elektrische Ansteuerstufe für die Wicklung des Elektromagnets. In besonders vorteilhafter Weise kann das Abgasrückführventil durch analoge oder quasianaloge Ansteuerung, getaktet mit variablen Tastverhältnis, in Zwischenstellungen gehalten werden.The exhaust gas recirculation valve according to the invention with the features the license plate has the advantage that on Valve member by providing the movable wall a compensation of the exhaust gas pressures acting on the valve member can be achieved. Accordingly, they are Operating forces that keep the valve in the open position should bring, only slightly, so that a quick and accurate Switching the exhaust gas recirculation valve is possible. It can also the electromagnet should be small and small Energy use can be operated. It is correspondingly small the effort for an electrical control stage for the Winding the electromagnet. In a particularly advantageous way Way, the exhaust gas recirculation valve by analog or quasi-analog control, clocked with variable Duty cycle, are held in intermediate positions.

In vorteilhafter Weiterbildung erfolgt die Verbindung des Steuerraums über einen durch den Ventilschaft gehenden Kanal, so daß eine unmittelbare Verbindung ohne gesonderte Leitungsführung zwischen Abgasrückführleitung und Steuerraum verwirklicht wird. Dies baut insbesondere klein bei leichter Montierbarkeit und geringen Fehlerquellen. Für den Druckausgleich ist insbesondere nach Patentanspruch 3 die vom Abgasdruck in Schließrichtung des Ventils beaufschlagte Fläche des Ventilglieds im wesentlichen gleich groß wie die in Öffnungsrichtung des Ventilglieds wirkende Fläche der beweglichen Wand. Durch die Dimensionierung dieser Fläche können die Schließkraft bei nicht erregtem Elektromagneten beziehungsweise die öffnungskraft des Elektromagneten exakt eingestellt werden. In weiter vorteilhafter Ausgestaltung besteht die bewegliche Wand aus einer Membrane. Dabei bietet die Ausführung des Abgasrückführventils nach den vorstehenden Ansprüchen 1 bis 3 den Vorteil, daß im Falle eines Risses der Membrane die Kompensation des Abgasdruckes in Schließrichtung entfällt und das Ventil durch den Abgasdruck stromaufwärts des Ventilglieds sicher geschlossen gehalten wird. Ein Teilstrom von Abgas gelangt dann über die Steuerkammer, die gerissene Membrane und den Druckraum in das Rohr als Teilmenge einer Abgasrückführung, die durch den Querschnitt des Kanals begrenzt werden kann. Insbesondere wird vermieden, daß bei einem Versagen der Membrane heißes Abgas in die Umgebung des Abgasrückführventils abströmt, in den Motorraum des zugehörigen Kraftfahrzeugs gelangt und dort gegebenenfalls Schäden verursachen kann.In an advantageous development, the connection of the Control room via a through the valve stem Channel, so that a direct connection without separate Line routing between exhaust gas recirculation line and control room is realized. This builds especially small with lighter Mountability and low sources of error. For the Pressure equalization is in particular according to claim 3 acted upon by the exhaust gas pressure in the closing direction of the valve Area of the valve member substantially the same size as that surface of the valve member acting in the opening direction movable wall. By dimensioning this area can change the closing force when the electromagnet is not energized or the opening force of the electromagnet exactly can be set. In a further advantageous embodiment the movable wall consists of a membrane. It offers the design of the exhaust gas recirculation valve according to preceding claims 1 to 3 the advantage that in the case of a crack in the membrane the compensation of the exhaust gas pressure in the closing direction and the valve through the Exhaust gas pressure upstream of the valve member safely closed is held. A partial flow of exhaust gas then passes through the Control chamber, the torn membrane and the pressure chamber in the pipe as a subset of exhaust gas recirculation by the Cross section of the channel can be limited. In particular it is avoided that hot if the membrane fails Exhaust gas flows into the surroundings of the exhaust gas recirculation valve, in reaches the engine compartment of the associated motor vehicle and may cause damage there.

In weiterhin vorteilhafter Ausgestaltung ist die bewegliche Wand als Kolben ausgebildet, gemäß Patentanspruch 5 womit ein Versagen, wie es bei der Verwendung einer Membrane möglich werden kann, hier sicher vermieden wird. Mit dieser Ausgestaltung kann vor allen Dingen auch sehr genau die Fläche bestimmt werden, die kompensierend zu dem Abgasdruck in Schließrichtung des Ventils auf das Ventilglied einwirkt. In vorteilhafter Weiterbildung gemäß Patentanspruch 11 ist der Mündung des Kanals vorgelagert am Ventilglied eine Schirmkappe vorgesehen, die dafür Sorge trägt, daß der Druck im Steuerraum nicht in Abhängigkeit von einem dynamischen Staudruck beeinflußt wird, sondern sich als statischer Abgasdruck einstellt. Die vorgelagerte Wand lenkt eine Anströmung von Abgas zur Mündung ab, so daß Abgas nur quer dazu mit einem Druck, der dem statischen Druck in der Abgasrückführleitung entspricht, in den Kanal eintreten kann. Somit wird vorteilhaft ein Stellergebnis des Abgasrückführventils, insbesondere, wenn dieses Zwischenstellungen zwischen offen und geschlossen einnehmen soll, durch den Strömungsdruck nicht beeinflußt. Die Art der Einmündung des Stutzens in das Rohr gemäß Patentanspruch 12 hat den Vorteil, daß der Stutzen selbst intensiv von kühlender Luft bei Luftführung im Rohr umspült wird und die Einführung von Abgas im Bereich des Strömungsprofils im Rohr erfolgt, das die höchste Geschwindigkeit aufweist und somit eine sehr schnelle, gleichmäßige Verwirbelung von Abgas mit zugeführter Luft ermöglicht. Wird gemäß Patentanspruch 13 die Mündung unmittelbar angrenzend an eine den Durchströmquerschnitt des Rohres steuernde Drosselklappe bewegt, so kann bei verschiedenen Stellungen der Drosselklappe dieser Kühlungs- und Verwirbelungseffekt intensiviert werden.In a further advantageous embodiment, the movable one Wall formed as a piston, with what a failure such as when using a membrane can be possible, is safely avoided here. With this Above all, design can be very precise Area to be determined that is compensating for the exhaust gas pressure acts on the valve member in the closing direction of the valve. In an advantageous development according to claim 11 upstream of the mouth of the channel on the valve member Umbrella cap provided, which ensures that the pressure in the control room not depending on a dynamic one Back pressure is affected, but rather as a static Sets exhaust gas pressure. The upstream wall directs one Inflow of exhaust gas to the mouth, so that exhaust gas only crosswise with a pressure that corresponds to the static pressure in the Exhaust gas recirculation line corresponds to enter the duct can. A setting result of the Exhaust gas recirculation valve, especially if this Take intermediate positions between open and closed should not be influenced by the flow pressure. The kind of Opening of the nozzle in the pipe according to claim 12 has the advantage that the nozzle itself intensely by cooling air is flushed in the pipe and the Introduction of exhaust gas in the area of the flow profile in the pipe takes place, which has the highest speed and thus a very fast, even swirling of exhaust gas with supplied air allows. According to claim 13 the mouth immediately adjacent to the Throttle valve controlling the flow cross-section of the pipe moved, so the different positions Throttle this cooling and swirling effect be intensified.

Zeichnungdrawing

Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine erste Ausführungsform des Abgasrückführventils mit einer Membrane als beweglicher Wand und Figur 2 eine zweite Ausführungsform des Abgasrückführventils mit einem Kolben als beweglicher Wand.Two embodiments of the invention are in the Drawing and are shown in the following Description explained in more detail. Figure 1 shows a first Embodiment of the exhaust gas recirculation valve with a membrane as a movable wall and Figure 2 shows a second embodiment of the exhaust gas recirculation valve with a piston as a movable one Wall.

Beschreibungdescription

In Figur 1 ist ein Rohr 1 dargestellt, das zum Beispiel Teil eines Ansaugsystemes einer Brennkraftmaschine ist. In der Wand 2 des Rohres 1 sind eine erste Öffnung 3 und dieser diametral gegenüberliegend eine zweite Öffnung 4 vorgesehen. Über die erste Öffnung 3 mündet eine Abgasrückführleitung 6 in das Rohr 1 ein. Dabei ist als Teil der Abgasrückführleitung ein Stutzen 8 vorgesehen, in das Innere des Rohres durch die Öffnung 3 hineinragt. Der Stutzen 8 kann zum Beispiel als Ziehteil aus Blech geformt sein und hat außenliegend einen Flansch 9, der zusammen mit einem Flansch 10 der Abgasrückführleitung und einem entsprechenden, nicht weiter gezeigten Flansch des Rohres 1 verschraubt ist, so daß der Übergang von Abgasrückführleitung und Stutzen dicht verschlossen ist. Der Stutzen wird mit seitlichem Abstand durch die Öffnung 3 geführt, zur Herstellung einer thermischen Isolation, insbesondere dann, wenn das Rohr 1 aus Kunststoff gefertigt ist.In Figure 1, a tube 1 is shown, for example part of an intake system of an internal combustion engine. In the Wall 2 of the tube 1 are a first opening 3 and this diametrically opposite a second opening 4 is provided. An exhaust gas recirculation line 6 opens via the first opening 3 into tube 1. It is part of the Exhaust gas recirculation line a connector 8 is provided in the interior of the tube protrudes through the opening 3. The nozzle 8 can for example be formed as a drawn part from sheet metal and has a flange 9 on the outside, which together with a Flange 10 of the exhaust gas recirculation line and one corresponding flange, not shown, of the tube 1 is screwed so that the transition from Exhaust gas recirculation line and nozzle is tightly closed. The Spigot is spaced through the opening 3 led to the production of thermal insulation, especially when the tube 1 is made of plastic is.

An dem durch die Öffnung 3 ragenden zylindrischen Teil 11 des Stutzens schließt sich ein kegelförmiger Teil 12 an, der einen Ventilsitz 13 bildet, dessen Sitzfläche ins Innere des Stutzens beziehungsweise zur Abgasrückführleitung hin gerichtet ist. Anschließend an den Ventilsitz 13 geht der Stutzen in ein Rohrteil 14 mit verringertem Durchmesser über, das kurz vor der Achse des Rohres 1 seine Mündung in das Rohr 1 hat.On the cylindrical part 11 protruding through the opening 3 the nozzle is followed by a conical part 12 which forms a valve seat 13, the seat surface inside the Nozzle or to the exhaust gas recirculation line is directed. Then goes to the valve seat 13 Neck in a pipe part 14 with a reduced diameter about that just before the axis of the tube 1 in has the tube 1.

Mit dem Ventilsitz 13 wirkt ein Ventilglied 15 zusammen, das eine kegelförmige Dichtfläche 16 hat und am Ende eines Ventilschafts 17 befestigt ist. Dieser Ventilschaft wird in einer Bohrung 18 dicht geführt, die in den Kern 19 eines Elektromagneten 20 axial eingebracht ist. Der Kern 19 ist mit einem Stutzen 21 in der zweiten Öffnung 4 geführt und in nicht weiter gezeigter Weise ebenfalls mit dem Rohr 1 dicht verbunden. Der Kern trägt eine Magnetwicklung 22, die innerhalb des den Elektromagneten aufnehmenden Gehäuses 24 angeordnet ist. Mit dem Kern arbeitet ein Tauchanker 25 mit im wesentlichen kreiszylindrischer Form zusammen, der bei Erregung der Magnetwicklung in eine axiale Ausnehmung 26 des Kerns 19 eintaucht. Die die Ausnehmung 26 umgebende Ringwand 27 des Kerns nimmt mit zunehmender Eintauchtiefe im Querschnitt zu. Auf diese Art und Weise wird eine Linearcharakteristik des Elektromagneten erzielt. Entgegen der magnetischen Kraft, die den Anker in die Ausnehmung 26 zieht, wirkt eine Druckfeder 29, die zwischen Anker 25 und Magnetkern 19 eingespannt ist und am Ventilschaft 17 geführt wird.A valve member 15 cooperates with the valve seat 13, the has a conical sealing surface 16 and at the end of a Valve stem 17 is attached. This valve stem is in a bore 18 guided tightly into the core 19 of a Electromagnet 20 is introduced axially. The core is 19 with a nozzle 21 in the second opening 4 and in not further shown also tight with the tube 1 connected. The core carries a magnetic winding 22 which within the housing 24 receiving the electromagnet is arranged. A submersible anchor 25 cooperates with the core essentially circular cylindrical shape together, which at Excitation of the magnetic winding in an axial recess 26 of the Kerns 19 immersed. The ring wall surrounding the recess 26 27 of the core increases with increasing immersion depth Cross section too. In this way, one Linear characteristic of the electromagnet achieved. opposite the magnetic force that forces the armature into the recess 26 pulls, a compression spring 29 acts between the armature 25 and Magnetic core 19 is clamped and guided on the valve stem 17 becomes.

Der Ventilschaft 17 durchdringt, wie bereits oben aufgeführt, koaxial den Magnetkern 19 und trägt an seinem Ende den Anker 25. Im ausgeführten Beispiel weist dazu der Ventilschaft eine Außenringschulter 30 auf, die vom Rohr 1 weggerichtet ist und der Magnetkern 25 eine Bohrung 31 auf, mittels der er auf dem im Durchmesser reduzierten Teil 32 des Ventilschaftes bis zur Anlage an die Schulter 30 geschoben wird. In dieser Stellung wird er durch Kontermuttern 33 auf dem Ventilschaft 17 fixiert. Alternativ kann der Anker auch auf dem Ventilschaft afgepreßt sein. Zwischen der Stirnseite 34 und den Kontermuttern 33 ist eine Scheibe 35 vorgesehen, zwischen der und der Stirnseite 34 eine Membrane 36 eingespannt wird, die an ihrem Außenumfang 37 zwischen einem Flansch 38 des Gehäuses 24 und einem Deckel 39 dicht eingeschlossen wird.The valve stem 17 penetrates, as already above listed, coaxial with the magnetic core 19 and carries on his End the anchor 25. In the example shown, the Valve stem on an outer ring shoulder 30 which from the tube 1 is directed away and the magnetic core 25 has a bore 31, by means of it on the reduced diameter part 32 of the valve stem up to the shoulder 30 is pushed. In this position he is through Lock nuts 33 fixed on the valve stem 17. Alternatively the anchor can also be pressed onto the valve stem. Between the end face 34 and the lock nuts 33 is one Washer 35 is provided between the and the end face 34 a membrane 36 is clamped on its Outer periphery 37 between a flange 38 of the housing 24 and a lid 39 is sealed.

Die Membrane 36 schließt nun zum Deckel 39 hin einen Steuerraum 41 ein, in den lediglich ein Kanal 42 mündet, der koaxial durch den Ventilschaft hindurchgeführt ist und andererseits unverschließbar im Inneren des Stutzens 8 stromaufwärts des Ventilsitzes 13 mündet. Auf der dem Steuerraum 41 gegenüberliegenden Seite begrenzt die Membrane einen Druckraum 44, der über einen ersten Kanal 46 im Anker 25 und einem zweiten Kanal 47 im Kern 19 mit dem Inneren des Rohres 1 unverschließbar verbunden ist. The membrane 36 now closes to the cover 39 Control room 41, in which only one channel 42 opens, the is passed coaxially through the valve stem and on the other hand, it cannot be closed inside the socket 8 opens upstream of the valve seat 13. On the Control room 41 opposite side delimits the membrane a pressure chamber 44, which via a first channel 46 in the Anchor 25 and a second channel 47 in the core 19 with the Inside the tube 1 is connected so that it cannot be closed.

Weiterhin ist im Rohr 1 unmittelbar angrenzend an den Stutzen 8 eine Drosselklappe 49 so angeordnet, daß sie von voller Offenstellung, wie gezeigt, in eine voll geschlossene Stellung des Rohres bringbar ist.Furthermore, the pipe 1 is immediately adjacent to the Nozzle 8 arranged a throttle valve 49 so that it from full open position, as shown, in a fully closed Position of the tube can be brought.

Der freie Wirkdurchmesser der Membrane 36, der vom Druck im Steuerraum 41 einerseits und vom Druck im Druckraum 44 andererseits belastet wird, ist im wesentlichen gleich groß wie der wirksam in Schließrichtung des Ventilglieds 15 vom Druck in der Abgasrückführleitung beaufschlagte Durchmesser des Ventilglieds 14. Somit wirkt auf das Ventilglied der Abgasdruck in Öffnungsrichtung im wesentlichen auf eine gleich große Fläche wie die Fläche, die durch den Abgasdruck in Schließrichtung beaufschlagt wird. Es heben sich die Abgaskräfte am ventilglied auf. Der Grad der Kompensation kann durch die Wahl der beaufschlagten Flächen variiert werden. In Schließrichtung des Ventilglieds wirkt dann somit hauptsächlich die Schließkraft der Druckfeder 29. Entgegen der Kraft dieser Feder wird das Abgasrückführventil bei Erregung der Magnetwicklung 22 des Elektromagneten 20 in verschiedene Öffnungsstellungen gebracht. Die Kraft, die dazu notwendig ist, bemißt sich aus der erforderlichen Schließkraft des Abgasrückführventils. Sie ist aber auch nicht durch die Drücke in der Abgasrückführleitung und im Rohr 1 beeinflußt. Denn diese Unterdrücke wirken sowohl auf die zum Rohr weisende Fläche des Ventilglieds 15 als auch auf die Membrane auf der Seite der Druckkammer 44. Die aus diesen Flächen beaufschlagten, resultierenden Kräfte heben sich ebenfalls gegenseitig auf. Ein solches Ventil baut sehr klein, da die relativ geringen Stellkräfte nur einen kleinen Elektromagneten erforderlich machen. The free effective diameter of the membrane 36, the pressure in Control chamber 41, on the one hand, and the pressure in pressure chamber 44 on the other hand, is essentially the same size as the effective in the closing direction of the valve member 15 from Pressure in the exhaust gas recirculation line acted on the diameter of the valve member 14. Thus acts on the valve member Exhaust gas pressure in the opening direction essentially to one same area as the area caused by the exhaust gas pressure is acted upon in the closing direction. They stand out Exhaust gas forces on the valve member. The degree of compensation can be varied by the choice of the areas applied become. Then acts in the closing direction of the valve member mainly the closing force of the compression spring 29 the exhaust gas recirculation valve is applied to the force of this spring Excitation of the magnetic winding 22 of the electromagnet 20 in brought different opening positions. The power that necessary for this is measured from the necessary Closing force of the exhaust gas recirculation valve. But it is also not by the pressures in the exhaust gas recirculation line and in Tube 1 affected. Because these negative pressures both affect the surface of the valve member 15 facing the tube as well on the membrane on the side of the pressure chamber 44. Die aus lift the resulting forces on these surfaces each other too. Such a valve builds a lot small, because the relatively low actuating forces only a small one Make electromagnets necessary.

Die Energiebereitstellung für einen solchen Magneten ist wenig aufwendig sowohl bzgl. der Energieerzeugung als auch bzgl. den erforderlichen Ansteuerungsendstufen einer elektronischen Steuereinrichtung. Vorteilhaft wird der Magnet getaktet mit variablem Tastverhältnis angesteuert, womit zwischen `ganz auf' und `ganz zu' verschiedene Zwischenstellungen und somit Dosierungsquerschnitte am Abgasrückführventil einstellbar sind. Natürlich könnte es auch analog angesteuert werden. Um insbesondere in Halboffenstellung und Offenstellung eine Druckerhöhung im Steuerraum 41 zu vermeiden, die aufgrund einer dynamischen Anströmung des am Abgasrückführventil austretenden Abgases entstehen können, ist die Mündung 50 des Kanals 42, die zentrisch zum Ventilglied 15 liegt, durch eine Schirmkappe 51 geschützt. Diese Schirmkappe weist eine der Mündung axial vorgelagerte Wand auf, die als Prallwand für die ankommende Abgasströmung dient. Durch seitliche Öfffnungen 53 kann dann das Abgas zur Druckbildung in den Steuerraum 41 eintreten. Dies erfolgt aus einer strömungsberuhigten Zone innerhalb der Kappe 51 mit einem Druck, der gleich dem statischen Druck des Abgases in der Abgasrückführleitung ist.The energy supply for such a magnet is little effort both in terms of energy production and with regard to the required control output stages of a electronic control device. The will be advantageous Magnet clocked with variable duty cycle, which differentiates between `` completely open '' and `` completely closed '' Intermediate positions and thus dosage cross sections on Exhaust gas recirculation valve are adjustable. Of course it could can also be controlled analog. In particular in Half-open and open position a pressure increase in the Avoid control room 41 due to dynamic Inflow of the exhaust gas emerging at the exhaust gas recirculation valve can arise is the mouth 50 of the channel 42, the is centered on the valve member 15 by a Shield cap 51 protected. This cap has one of the Mouth axially upstream wall that serves as a baffle for the incoming exhaust gas flow serves. By side Openings 53 can then the exhaust gas for pressure formation in the Enter control room 41. This is done from a flow-reduced zone within the cap 51 with a Pressure equal to the static pressure of the exhaust gas in the Exhaust gas recirculation line is.

Die Art der Einbringung des Abgasdruckes in den Steuerraum 41 ist besonders vorteilhaft durch den hier vorgesehenen Kanal 42 im Ventilschaft 17. Aufgrund dieser Ausgestaltung sind keine gesonderten Leitungsverbindungen zwischen Abgasrückführleitung und dem Steuerraum 41 notwendig, die im anderen Falle zusätzlichen Verbindungsaufwand und Dichtaufwand mit der Möglichkeit eines Schadensfalles mit sich bringen würde. Natürlich ist auch möglich statt des Kanals, der durch den Ventilschaft geht, eine entsprechend andere Verbindung vorzusehen, z. B. in Form eines durch das Gehäuse des Abgasrückführventils und das Rohr zur Abgasrückführleitung geführten Kanals oder einer separaten Leitung dorthin.The type of introduction of the exhaust gas pressure into the control room 41 is particularly advantageous due to the one provided here Channel 42 in the valve stem 17. Because of this configuration are no separate line connections between Exhaust gas recirculation line and the control room 41 necessary in the otherwise additional connection effort and Sealing effort with the possibility of a damage event would bring himself. Of course it is also possible instead of Channel that goes through the valve stem, one accordingly to provide another connection, e.g. B. in the form of a Exhaust gas recirculation valve housing and pipe for Exhaust gas recirculation line duct or a separate Lead there.

Da durch den Steuerraum 41 keine Abgasströmung auftritt, kann das dort enthaltenen Gas seine Wärme an das Gehäuse abgeben und es bleibt weit unter der Temperatur, die das Abgas aufweist, das über die Abgasrückführleitung zuströmt. Es wird lediglich der Abgasdruck weitergegeben, nicht aber kommt es zu einem wesentliche Gasaustausch über den die Membran stark temperaturbelastet wäre.Since there is no exhaust gas flow through the control chamber 41, the gas contained there can transfer its heat to the housing give off and it stays well below the temperature that the Has exhaust gas that flows in via the exhaust gas recirculation line. Only the exhaust gas pressure is passed on, but not there is an essential gas exchange via the Membrane would be heavily exposed to temperature.

Das bei geöffneten Abgasrückführventil in das Rohr 1 eintretende Abgas wird über den Rohrteil 14 erst etwa in der Mitte des Rohres 1 freigegeben, dort wo die höchsten Geschwindigkeitsanteile eines Strömungsprofils des das Rohr 1 durchströmenden Mediums auftreten. Dieses Medium ist im vorliegenden Falle Luft oder Luftkraftstoffgemisch. Diese weite Hineinreichung in das Rohr 1 bei der dünnwandigen Ausgestaltung des Stutzens führt zu einer intensiven Kühlung des Stutzens durch die umströmende kühlere Luft, was der Verbindungsstelle des Stutzens mit dem Rohr 1 Wärme entzieht, die über die Abgasrückführleitung 6 vom Abgas aufgenommen und weitergeleitet wird. Damit wird die Verbindungsstelle zwischen Stutzen 8 und Rohr 1 thermisch weniger belastet. Die unmittelbare Nachbarschaft der Drosselklappe bewirkt eine Intensivierung der Luftströmung. Die Einführung des Abgases in den Strömungskern des Rohres 1 verbessert die schnelle Verwirbelung und Vermischung des eingeführten Abgases mit dem dort strömenden Medium.With the exhaust gas recirculation valve open, put it into pipe 1 Exhaust gas entering is only about in the pipe part 14 Middle of the pipe 1 released, where the highest Velocity components of a flow profile of the Tube 1 flowing medium occur. This medium is in the present case air or air-fuel mixture. This far into the tube 1 in the thin-walled The design of the nozzle leads to intensive cooling of the nozzle due to the cooler air flowing around it Connection point of the nozzle with the pipe 1 heat withdraws from the exhaust gas via the exhaust gas recirculation line 6 is recorded and forwarded. With that the Connection point between pipe 8 and pipe 1 thermally less burdened. The immediate neighborhood of the Throttle valve intensifies the air flow. The introduction of the exhaust gas into the flow core of the pipe 1 improves the rapid swirling and mixing of the introduced exhaust gas with the medium flowing there.

Die beschriebene Ventilkonstruktion ist im hohen Maße schadenssicher, derart, daß im Falle eines Bruches der Membrane 36 der Kraftausgleich durch den Abgasdruck im Steuerraum 41 entfällt, was zur Folge hat, daß der Abgasdruck verstärkt auf das Ventilglied 15 in dessen Schließrichtung wirkt. Dabei kann in keinem Falle eine zu hohe Abgasrückführung eingestellt werden, was die Betriebsfähigkeit einer zugehörigen Brennkraftmaschine erhält. Selbst wenn der Magnet aufgrund zu hoher Abgasdruckkräfte nicht mehr in der Lage sein sollte, ordnungsgemäß zu arbeiten oder gar das Ventil zu öffnen, erfolgt im geringen Maße noch eine Abgasrückführung über den Kanal 42, den Steuerraum 41, die Kanäle 46 und 47 in das Rohr 1. In keinem Falle tritt aber bei einem Bruch der Membrane Abgas in die Umgebung aus.The valve construction described is to a high degree damage-proof, such that in the event of a break the Membrane 36 the force balance by the exhaust gas pressure in the Control room 41 is omitted, which means that the Exhaust gas pressure increases on the valve member 15 in the Closing direction works. Under no circumstances can one high exhaust gas recirculation can be set what the Operability of an associated internal combustion engine receives. Even if the magnet is too high due to Exhaust gas pressure forces should no longer be able work properly or even open the valve, there is still a small amount of exhaust gas recirculation via the Channel 42, the control room 41, the channels 46 and 47 in the Tube 1. In no case does the break occur Membrane exhaust into the environment.

Bei einer zweiten Ausführungsform des erfindungsgemäßen Abgasrückführventils gemäß Figur 2 sind im wesentlichen gleiche Teile wie beim Ausführungsbeispiel nach Figur 1 vorgesehen. Abweichend von dieser ist der im Magnetkern abgewandte Teil des Ankers 125 als Kolben 136 ausgebildet, der in Ersatz der Membrane eine bewegliche Wand bildet, indem der Kolben dicht in einer Bohrung 61 gleitet und dabei mit einem Gehäusedeckel 139 wiederum einen Steuerraum 141 dicht einschließt. Dabei trennt der Kolben 136 diesen Steuerraum 141 von einem Druckraum 144, der in seiner Ausgestaltung gleich ist wie der Druckraum 44 vom Ausführungsbeispiel nach Figur 1. Die Bohrung 61 ist dabei in einem Gehäuseteil vorgesehen, das aus nicht magnetisierbarem Werkstoff besteht, vorzugsweise in Form einer Messinghülse 65, die fest in das Gehäuse eingesetzt ist, so daß sich der Kolben unbeeinflußt vom Magneten innerhalb dieses Bereiches leicht beweglich ist. In seiner in der Figur 2 gezeigten Schließstellung gelangt die Stirnseite 66 des Kolbens an eine Dichtung 67, die zum Beispiel am Deckel 139 eingesetzt ist, derart, daß der Steuerraum 141 zur Führung des Kolbens hin abgedichtet wird, wenn sich das Abgasrückführventil in seiner Schließstellung befindet. Damit wird vermieden, daß Abgas über die Führung in den Druckraum 144 austreten kann, was wegen des notwendigen Verschiebespiels des Kolbens möglich wäre und was dazu führen könnte, daß sich Abgasablagerungen in der Führung bilden, die dann insbesondere nach längeren Schließzeiten des Abgasventils zu erhöhten Reibungen und Funktionsausfällen des Abgasrückführventils führen könnte. Der Kolben 136 kann ferner, wie gezeigt, mit einer axialen Ausnehmung 68 versehen sein, in die derr Kanal 42 mündet und die durch ein Rußfilter ausgefüllt ist. Auch dies vermeidet eine Verschmutzung der Führung des kolbens 136 in der Hülse 65. Gegenüber dem Ausführungsbeispiel nach Figur 1 hat diese Ausführungsform dabei den wesentlichen Vorteil, daß mit einem Schadensfall, wie dem Bruch der Membrane von Figur 1, hier nicht gerechnet werden muß. Das Ventil hat somit eine wesentlich höhere Lebenserwartung. Wie auch beim vorhergehenden Ausführungsbeispiel ist am Ventilglied 15 ebenfalls eine Schirmkappe 51 vorgesehen, die verhindert, daß ein dynamischer Abgasdruck in den Steuerraum 141 gelangt.In a second embodiment of the invention Exhaust gas recirculation valve according to Figure 2 are essentially same parts as in the embodiment of Figure 1 intended. Deviating from this is that in the magnetic core part of armature 125 facing away from piston 136, which forms a movable wall to replace the membrane, by the piston sliding tightly in a bore 61 while doing so with a housing cover 139 in turn a control room 141 tightly encloses. The piston 136 separates it Control room 141 from a pressure room 144, which in its Design is the same as the pressure chamber 44 from Embodiment according to Figure 1. The bore 61 is there provided in a housing part that does not consist of magnetizable material, preferably in the form a brass sleeve 65, which is firmly inserted into the housing is so that the piston is unaffected by the magnet is easily movable within this range. In its in the closed position shown in FIG Face 66 of the piston to a seal 67, the Example is used on the lid 139, such that the Control chamber 141 is sealed off to guide the piston, when the exhaust gas recirculation valve is in its closed position located. This will prevent exhaust gas from passing through the guide can emerge in the pressure chamber 144, which is because of the necessary displacement play of the piston would be possible and which could lead to exhaust gas deposits in the Form leadership, which then especially after longer Exhaust valve closing times to increased friction and Failure of the exhaust gas recirculation valve could result. Piston 136 may also have an axial, as shown Recess 68 may be provided, in which derr 42 opens and which is filled in by a soot filter. This too avoids contamination of the guide of the piston 136 in the sleeve 65. Compared to the exemplary embodiment according to FIG. 1 this embodiment has the essential advantage that with a case of damage, such as the rupture of the membrane of Figure 1, does not have to be calculated here. The valve has thus a much higher life expectancy. As with the previous exemplary embodiment is on the valve member 15 a shield cap 51 is also provided, which prevents that a dynamic exhaust pressure in the control room 141st reached.

Claims (16)

  1. Exhaust-gas recirculation valve for controlling exhaust-gas recirculation quantities which are fed to the intake side of an internal combustion engine via an exhaust-gas recirculation line (8) which has a conical valve seat (13) which faces in a direction opposite to the exhaust-gas flow in the exhaust-gas recirculation line and with which there interacts a valve member (15) which is actuated by an armature (25, 125) of an electromagnet (20) which is arranged in a housing (24) which is connected to a tube (1) carrying the recirculation exhaust gas, the valve member opening into the exhaust-gas recirculation line (8) upstream of the valve seat and being arranged at the end of a valve stem (17) which is passed through the wall (2) of the tube (1) and is loaded in the closing direction of the valve member (15) by a spring (29), characterized in that the armature (25, 125) is firmly connected to the valve stem (17), and the valve stem (17) is firmly connected, at least indirectly, to a moveable wall (36, 136) which on its one side delimits a pressure space (44, 144) connected to the interior of the tube (1) and separates this pressure space leaktightly from a control space (41, 141) which adjoins it on its other side and is connected to the exhaust-gas recirculation line (6) upstream of the valve seat (13).
  2. Exhaust-gas recirculation valve according to Claim 1, characterized in that the control space (41, 141) is connected to the exhaust-gas recirculation line (6, 8) upstream of the valve seat by a duct (42) in the valve stem (17).
  3. Exhaust-gas recirculation valve according to Claim 1 or 2, characterized in that that surface of the valve member (15) which is acted upon in the closing direction by the exhaust-gas pressure is essentially the same size as that surface of the moveable wall (36, 136) which delimits the control space (41, 141) and acts on the valve stem (17) in the opening direction of the valve member (15).
  4. Exhaust-gas recirculation valve according to Claim 3, characterized in that the moveable wall is a diaphragm (36), the edges of which are, on the one hand, clamped in the housing (24, 38, 39) and, on the other hand, are connected leaktightly to the valve stem (17) in a manner which allows passage through the duct.
  5. Exhaust-gas recirculation valve according to Claim 3, characterized in that the moveable wall (136) is designed as a piston guided leaktightly in the housing.
  6. Exhaust-gas recirculation valve according to Claim 5, characterized in that the piston (136) is part of the armature (125) and slides as the extension of the latter in a nonmagnetizable part (65).
  7. Exhaust-gas recirculation valve according to Claim 6, characterized in that, in its end position corresponding to the closed position of the valve member, the armature is in leaktight contact with a seal (67) which, in this position of the armature (136), separates the control space (141) from the guide of the armature in the nonmagnetizable part (65).
  8. Exhaust-gas recirculation valve according to Claims 3 to 7, characterized in that the valve seat (13) and the sealing surface (16) of the valve member (15) are of conical design.
  9. Exhaust-gas recirculation valve according to one of the preceding claims, characterized in that the armature is embodied as a solenoid plunger (25, 125) which is secured on the valve stem (17).
  10. Exhaust-gas recirculation valve according to Claim 9, characterized in that the electromagnet (20) is embodied as a linear magnet.
  11. Exhaust-gas recirculation valve according to Claim 9, characterized in that the armature (25, 125) and the magnet core (19) of the electromagnet (20) have ducts (46, 47) which establish the connection between the tube (1) and the pressure space (44, 144).
  12. Exhaust-gas recirculation valve according to one of the preceding claims, characterized in that a shielding cap (51), which has a wall (52) situated in front of the mouth (50) of the duct (42), counter to the direction of flow of the inflowing exhaust gas, is provided on the valve member (15).
  13. Exhaust-gas recirculation valve according to one of the preceding claims, characterized in that the exhaust-gas recirculation line is in the form of a stub (8) on which the valve seat (13) is formed and which projects perpendicularly into the tube (1).
  14. Exhaust-gas recirculation valve according to Claim 13, characterized in that the stub (8) is formed from drawn sheet metal and, at the valve seat, then merges into a tubular part (14) which surrounds the valve stem (17) and extends approximately as far as the centre of the tube (1).
  15. Exhaust-gas recirculation valve according to Claim 14, characterized in that the tubular part (14) is situated directly upstream of a throttle valve (49) which controls a cross-section of flow through the tube (1).
  16. Exhaust-gas recirculation valve according to one of the preceding claims, characterized in that the electromagnet (20) is activated in a pulsed manner at a variable duty ratio by a control device in order to move the exhaust-gas recirculation valve into various open positions.
EP96934428A 1996-03-01 1996-09-19 Exhaust gas return valve Expired - Lifetime EP0857252B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19607811A DE19607811A1 (en) 1996-03-01 1996-03-01 Exhaust gas recirculation valve
DE19607811 1996-03-01
PCT/DE1996/001775 WO1997032125A1 (en) 1996-03-01 1996-09-19 Exhaust gas return valve

Publications (2)

Publication Number Publication Date
EP0857252A1 EP0857252A1 (en) 1998-08-12
EP0857252B1 true EP0857252B1 (en) 2001-03-21

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EP96934428A Expired - Lifetime EP0857252B1 (en) 1996-03-01 1996-09-19 Exhaust gas return valve

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US (1) US5975064A (en)
EP (1) EP0857252B1 (en)
JP (1) JPH11504694A (en)
DE (2) DE19607811A1 (en)
WO (1) WO1997032125A1 (en)

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US5669364A (en) * 1996-11-21 1997-09-23 Siemens Electric Limited Exhaust gas recirculation valve installation for a molded intake manifold
US6073617A (en) * 1997-07-08 2000-06-13 Siemens Canada Ltd. Manifold-mounted emission control valve
US6223733B1 (en) 1997-07-08 2001-05-01 Siemens Canada Limited Exhaust gas recirculation valve
EP0962646A4 (en) * 1997-10-22 2000-09-20 Mitsubishi Electric Corp Exhaust gas recirculation control valve device
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JPH11504694A (en) 1999-04-27
DE19607811A1 (en) 1997-09-04
WO1997032125A1 (en) 1997-09-04
US5975064A (en) 1999-11-02
EP0857252A1 (en) 1998-08-12
DE59606643D1 (en) 2001-04-26

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