EP0857252B1 - Soupape de retour de gaz d'echappement - Google Patents

Soupape de retour de gaz d'echappement 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
Authority
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
Other languages
German (de)
English (en)
Other versions
EP0857252A1 (fr
Inventor
Erwin Krimmer
Bruno Hezel
Eberhard Wizgall
Tilman Miehle
Peter Jauernig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0857252A1 publication Critical patent/EP0857252A1/fr
Application granted granted Critical
Publication of EP0857252B1 publication Critical patent/EP0857252B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)

Claims (16)

  1. Soupape de recyclage de gaz d'échappement pour commander des recyclages de gaz d'échappement, amenés à l'admission d'un moteur à combustion interne par l'intermédiaire d'une conduite de recyclage de gaz d'échappement (8) qui présente un siège de soupape (13) en forme de cône, dirigé en sens opposé à la conduite de recyclage des gaz d'échappement, avec lequel coopère une tête de soupape (15), actionnée par une armature (25, 125) d'un électroaimant (20) disposé dans un boítier (24), soupape reliée à un tuyau (1) pour faire passer au-delà les gaz d'échappement recyclés, la tête de la soupape s'ouvrant dans la conduite de recyclage des gaz d'échappement (8) en amont du siège de la soupape, et étant disposée à l'extrémité d'une tige de soupape (17) guidée à travers la paroi (2) du tuyau (1) en étant comprimée par un ressort (29) quand la tête de la soupape (15) est en position fermée,
    caractérisée en ce que
    l'armature (25, 125) est reliée de façon solidaire à la tige de la soupape (17) et la tige de la soupape (17) est reliée d'une manière au moins indirecte de façon solidaire à une paroi mobile (36, 136) qui délimite sur l'un de ses côtés une chambre de pression (44, 144) reliée avec l'intérieur du tuyau (1), qui et sépare de façon étanche cette dernière d'une chambre de commande (41, 141) se raccordant sur son autre côté, et reliée à la conduite de recyclage des gaz d'échappement (6) en amont du siège de soupape (13).
  2. Soupape de recyclage de gaz d'échappement selon la revendication 1,
    caractérisée en ce que
    la chambre de commande (41, 141) est reliée par l'intermédiaire d'un canal (42) dans la tige de la soupape (17) à la conduite de recyclage des gaz d'échappement (6, 8) en amont du siège de la soupape.
  3. Soupape de recyclage de gaz d'échappement selon la revendication 1 ou 2,
    caractérisée en ce que
    la surface de la tête de la soupape (15) qui est sollicitée par la pression des gaz d'échappement dans le sens de la fermeture, est sensiblement aussi grande que la surface de la paroi mobile (36, 136), délimitant la chambre de commande (41, 141), et agissant sur la tige de la soupape (17) dans le sens de l'ouverture de la tête de soupape (15).
  4. Soupape de recyclage de gaz d'échappement selon la revendication 3,
    caractérisée en ce que
    la paroi mobile est une membrane (36), dont les bords sont insérés d'un côté dans le boítier (24, 38, 39) et de l'autre sont reliés à la tige de la soupape (17) en permettant le passage du canal.
  5. Soupape de recyclage de gaz d'échappement selon la revendication 3,
    caractérisée en ce que
    la paroi mobile (136) est constituée sous la forme d'un piston passant de façon étanche dans le boítier.
  6. Soupape de recyclage de gaz d'échappement selon la revendication 5,
    caractérisée en ce que
    le piston (136) fait partie de l'armature (125) et glisse comme son prolongement dans une pièce (65) non magnétisable.
  7. Soupape de recyclage de gaz d'échappement selon la revendication 6,
    caractérisée en ce que
    l'armature est en appui étanche dans sa position finale correspondant à la position fermée de la tête de soupape par un joint d'étanchéité (67) qui dans cette position de l'armature (136) sépare la chambre de commande (141) du passage de l'armature dans la pièce non magnétisable (65).
  8. Soupape de recyclage de gaz d'échappement selon l'une des revendications 3 à 7,
    caractérisée en ce que
    le siège de soupape (13) et la surface d'étanchéité (16) de la tête de soupape (15) sont constitués en forme de cône.
  9. Soupape de recyclage de gaz d'échappement selon l'une des revendications précédentes,
    caractérisée en ce que
    l'armature est réalisée sous la forme d'un noyau plongeur (25, 125) fixé sur la tige de soupape (17).
  10. Soupape de recyclage de gaz d'échappement selon la revendication 9,
    caractérisée en ce que
    l'électroaimant (20) est réalisé sous la forme d'un électroaimant linéaire.
  11. Soupape de recyclage de gaz d'échappement selon la revendication 9,
    caractérisée en ce que
    l'armature (25, 125) et le noyau magnétique (19) de l'électroaimant (20) présentent des canaux (46, 47) qui établissent la liaison entre le tuyau (1) et la chambre de pression (44, 144).
  12. Soupape de recyclage de gaz d'échappement selon l'une quelconque des revendications précédentes,
    caractérisée en ce qu'
    il est prévu sur la tête de soupape (15) un chapeau de protection (51), qui présente une paroi (52) montée en avant de l'embouchure (50) du canal (42) en sens contraire du sens de l'écoulement des gaz d'échappement.
  13. Soupape de recyclage de gaz d'échappement selon quelconque l'une des revendications précédentes,
    caractérisée en ce que
    la conduite de recyclage des gaz d'échappement est réalisée sous la forme d'un ajutage (8) sur lequel est constitué le siège de soupape (13) et qui pénètre perpendiculairement dans le tuyau (1).
  14. Soupape de recyclage de gaz d'échappement selon la revendication 13,
    caractérisée en ce que
    l'ajutage (8) est constitué à partir d'une tôle emboutie et se transforme ensuite sur le siège de la soupape en une pièce tubulaire (14), qui entoure la tige de soupape (17) et va à peu près jusqu'au milieu du tuyau (1).
  15. Soupape de recyclage de gaz d'échappement selon la revendication 14,
    caractérisée en ce que
    la pièce tubulaire (14) se trouve directement en amont d'un clapet d'étranglement (49) qui commande la section transversale d'écoulement du tuyau (1).
  16. Soupape de recyclage de gaz d'échappement selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    l'électroaimant (20) est commandé par un dispositif de commande en étant actionné avec un taux d'impulsions variable, pour mettre la soupape de recyclage de gaz d'échappement dans différentes positions d'ouverture.
EP96934428A 1996-03-01 1996-09-19 Soupape de retour de gaz d'echappement Expired - Lifetime EP0857252B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19607811 1996-03-01
DE19607811A DE19607811A1 (de) 1996-03-01 1996-03-01 Abgasrückführventil
PCT/DE1996/001775 WO1997032125A1 (fr) 1996-03-01 1996-09-19 Soupape de retour de gaz d'echappement

Publications (2)

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

Family

ID=7786869

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96934428A Expired - Lifetime EP0857252B1 (fr) 1996-03-01 1996-09-19 Soupape de retour de gaz d'echappement

Country Status (5)

Country Link
US (1) US5975064A (fr)
EP (1) EP0857252B1 (fr)
JP (1) JPH11504694A (fr)
DE (2) DE19607811A1 (fr)
WO (1) WO1997032125A1 (fr)

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EP0962646A4 (fr) * 1997-10-22 2000-09-20 Mitsubishi Electric Corp Dispositif a soupape de commande de recyclage des gaz d'echappement
US6293266B1 (en) * 1998-05-26 2001-09-25 A. Kayser Automotive Systems Gmbh Exhaust gas recirculation device
US6135415A (en) * 1998-07-30 2000-10-24 Siemens Canada Limited Exhaust gas recirculation assembly
US6182646B1 (en) * 1999-03-11 2001-02-06 Borgwarner Inc. Electromechanically actuated solenoid exhaust gas recirculation valve
US6422223B2 (en) 1999-03-11 2002-07-23 Borgwarner, Inc. Electromechanically actuated solenoid exhaust gas recirculation valve
DE19927186A1 (de) 1999-06-15 2000-12-28 Daimler Chrysler Ag Abgasrückführeinrichtung mit einem Tellerventil
US6217001B1 (en) * 1999-06-29 2001-04-17 Delphi Technologies, Inc. Pressure balanced gas valve
JP4667609B2 (ja) * 2000-02-29 2011-04-13 イーグル工業株式会社 ソレノイド
US6776146B1 (en) * 2003-01-27 2004-08-17 International Engine Intellectual Property Company, Llc Obstruction of flow to improve flow mix
JP4192763B2 (ja) * 2003-11-07 2008-12-10 株式会社日立製作所 電子式ｅｇｒガス制御装置
WO2005052347A1 (fr) * 2003-11-28 2005-06-09 Hitachi, Ltd. Dispositif de commande rge et dispositif a papillon entraine par un moteur d'un moteur diesel
US6959700B2 (en) 2004-03-18 2005-11-01 International Engine Intellectual Property Company, Llc Flow deflector for a pipe
US7934696B1 (en) * 2006-02-21 2011-05-03 John Gruben Ether injection control valve
FR2921433B1 (fr) * 2007-09-25 2009-11-06 Mann & Hummel Gmbh Dispositif de mise en tourbillonnement et de melange de gaz d'echappement recycles dans la tubulure d'aspiration d'un moteur a combustion interne.
DE102009004803A1 (de) * 2008-01-17 2009-07-23 Eto Magnetic Gmbh Elektromagnetisch betätigbare Ventilvorrichtung
DE102010025171B4 (de) * 2010-06-25 2014-02-27 Pierburg Gmbh Fluiddruckumschaltventil
DE102013209923A1 (de) * 2013-05-28 2014-12-04 Continental Teves Ag & Co. Ohg Elektromagnetventil, insbesondere für schlupfgeregelte Kraftfahrzeugbremsanlagen
DE102015215734A1 (de) 2015-08-18 2017-02-23 Mahle International Gmbh Ventiltrieb einer abgasführenden Einrichtung

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US5065979A (en) * 1990-01-10 1991-11-19 Lectron Products, Inc. Constant current vacuum regulator
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DE4039351A1 (de) * 1990-12-10 1992-06-11 Pierburg Gmbh Elektromagnetisches steuerventil fuer abgasrueckfuehrung
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Also Published As

Publication number Publication date
US5975064A (en) 1999-11-02
WO1997032125A1 (fr) 1997-09-04
EP0857252A1 (fr) 1998-08-12
DE59606643D1 (de) 2001-04-26
JPH11504694A (ja) 1999-04-27
DE19607811A1 (de) 1997-09-04

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