EP0588706A1 - Exhaust gas recirculation valve control assembly for an internal combustion engine - Google Patents

Exhaust gas recirculation valve control assembly for an internal combustion engine Download PDF

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Publication number
EP0588706A1
EP0588706A1 EP93402226A EP93402226A EP0588706A1 EP 0588706 A1 EP0588706 A1 EP 0588706A1 EP 93402226 A EP93402226 A EP 93402226A EP 93402226 A EP93402226 A EP 93402226A EP 0588706 A1 EP0588706 A1 EP 0588706A1
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EP
European Patent Office
Prior art keywords
solenoid valve
vacuum
control assembly
assembly according
vacuum regulator
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.)
Withdrawn
Application number
EP93402226A
Other languages
German (de)
French (fr)
Inventor
Pierre Heritier-Best
Isabelle Brault
Bernard Judelle
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.)
Sagem SA
Original Assignee
Sagem Allumage SA
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Filing date
Publication date
Application filed by Sagem Allumage SA filed Critical Sagem Allumage SA
Publication of EP0588706A1 publication Critical patent/EP0588706A1/en
Withdrawn legal-status Critical Current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
    • F02M26/60—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor in response to air intake 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
    • F02M26/45—Sensors specially adapted for EGR systems
    • F02M26/48—EGR valve position sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/55—Systems for actuating EGR valves using vacuum actuators
    • F02M26/56—Systems for actuating EGR valves using vacuum actuators having pressure modulation valves
    • F02M26/57—Systems for actuating EGR valves using vacuum actuators having pressure modulation valves using electronic means, e.g. electromagnetic valves
    • 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
    • F02M2026/001—Arrangements; Control features; Details
    • F02M2026/002—EGR valve being controlled by vacuum or overpressure
    • F02M2026/0025—Intake vacuum or overpressure modulating valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S137/00—Fluid handling
    • Y10S137/907—Vacuum-actuated valves

Definitions

  • the present invention relates to an assembly for controlling an exhaust gas recirculation valve of an internal combustion engine, and more particularly to such an assembly comprising a vacuum regulator, the inlet of which is designed to be connected to a source. and a solenoid valve whose input is connected to the output of the vacuum regulator and whose output is arranged to be connected to the control input of the recirculation valve so as to provide said control input with a functional vacuum an electrical signal for controlling the solenoid valve.
  • Such assemblies are already known and are used to control a valve capable of putting the exhaust circuit into communication with the intake circuit of an internal combustion engine in order to recycle a more or less significant part of the exhaust gases. .
  • the present invention aims to overcome these drawbacks.
  • the subject of the invention is a control assembly of the above type, characterized in that the body of the vacuum regulator is formed in one piece with a cover for closing the body of the solenoid valve, a conduit formed in said part making the interior of the body of the vacuum regulator correspond with the interior of the body of the solenoid valve.
  • the assembly thus produced is particularly compact and it is also much easier to assemble since its elements can be pre-assembled on the part forming the body of the vacuum regulator and the cover for closing the body of the solenoid valve before the latter is in one go mounted on the engine it must equip.
  • the periphery of the end of said duct on the side of the solenoid valve preferably forms a first seat for a member for closing the solenoid valve, the outlet of the solenoid valve being vented when the closing member is applied to said first seat.
  • the solenoid valve may include a venting opening facing said end of the conduit, the periphery of said opening forming a second seat for said closure member, which is disposed between said end of the conduit and said orifice, the outlet of the solenoid valve being placed in communication with said vacuum regulator when said closure member is applied to said second seat.
  • said closure member is arranged to be attracted alternately to one or the other seats by an electromagnet and elastic return means, said electromagnet being powered by said electrical control signal, said signal being a rectangular signal with substantially constant frequency and variable duty cycle.
  • Said communication conduit between the interior of the vacuum regulator body and the interior of the valve body preferably includes a flow control nozzle.
  • this conduit is formed of at least two parts of conduit opening into one another and of axes inclined with respect to each other, the first part of the conduit opening out to the air near the location where it opens in the second part and said nozzle being formed in a plug placed in the first part of the duct at the location where it opens in the second part by sealing the vent free of said first part.
  • the vacuum regulator may further include adjustment means accessible at its inlet orifice.
  • the body of an enclosure forming a vacuum reserve is made in one piece with the body of the vacuum regulator and the cover closing the body of the solenoid valve, the inlet of the vacuum regulator opening into said enclosure and said enclosure being capable of being connected to said source of vacuum.
  • said enclosure can be closed by a cover carrying a non-return valve whose inlet is in said enclosure and whose outlet is capable of being connected to said source of vacuum.
  • the figures show a single piece 1 forming the wall 2 of an enclosure 3, the body 4 of a vacuum regulator 5 and a cover 6 for closing the body 7 of a solenoid valve 8.
  • the enclosure 3 is closed by a cover 9 carrying a non-return valve 10.
  • the non-return valve 10 has an inlet constituted by an orifice 11 formed in the cover 9 and an outlet 12 capable of being connected to a source of vacuum such as the air intake of an internal combustion engine.
  • the enclosure 3 therefore forms a vacuum reserve.
  • the interior space 13 of the vacuum regulator 5 is connected by a conduit 14 to the enclosure 3.
  • This internal space 13 is closed by a membrane 15 loaded by a calibration spring 16 bearing on the one hand on an annular piece 17 for connection to the membrane and, on the other hand, on a cup 18 provided with a tongue of guide 19 engaged in a guide groove 20 of the body 4.
  • An adjustment piece 21 coaxial with the duct 14 and the spring 16 has a thread cooperating with a corresponding thread of the cup 18 so that a rotation of the piece 21, driven by any suitable tool from inside the enclosure 3, causes an axial displacement of the cup 18 and consequently a more or less significant compression of the spring 16, and an adjustment of the pressure in the enclosure 3.
  • the membrane 15 also carries a closure member 22 of an orifice 23 for venting formed in a cover 24 of the vacuum regulator 5.
  • the solenoid valve 8 comprises an electromagnet 25 powered by a rectangular signal with variable duty cycle and cooperating with a frame 26 carried by a flexible blade 27.
  • the frame 26 carries a double closing member 28a, 28b.
  • the member 28b is located opposite a seat 29 formed at the end of a conduit 30 coaxial with the electromagnet 25 and making it possible to vent the interior space 31 to the solenoid valve 8 via a filter 32.
  • the closure member 28a can cooperate with a seat 33 formed around the orifice of a hole 34 formed in the closure cover 6 of the solenoid valve 8.
  • the hole 34 communicates with another hole 35 so as to communicate space 31 inside the solenoid valve 8 space 13 inside the vacuum regulator 5.
  • the holes 34 and 35 have their axes perpendicular to each other and located in the same plane.
  • the bore 35 opens to the outside of the assembly but it is closed at the level where it opens into the bore 34 by a plug 38 forming a nozzle 39 for regulating the flow between the holes 34 and 35.
  • the space 31 inside the solenoid valve 8 is also connected to the control input of an exhaust gas recirculation valve via a conduit 36.
  • the member 33 opens the end of the bore 34 and consequently places the interior 13 of the vacuum regulator in communication with the outlet 36 of the solenoid valve.
  • the pressure regulated by the regulator 5 is therefore applied to the control input of the exhaust gas recirculation valve, the member 28b isolating the space 31 from the external pressure.
  • the duty cycle of the signal applied to the electromagnet 25 therefore determines the average pressure applied to the control input of the recirculation valve and therefore the proportion of exhaust gas recycled to the intake.
  • control assembly thus produced is particularly compact, all of these elements being carried by the same part 1. It is also easy to assemble and mount on the engine for which it is intended.

Abstract

The invention relates to an assembly for controlling an exhaust gas recirculation valve of an internal combustion engine, comprising a partial vacuum regulator (5), the inlet of which is laid out so as to be connected to a source of partial vacuum, and a solenoid valve (8), the inlet of which is connected to the outlet of the partial-vacuum regulator and the outlet of which is laid out to be connected to the control inlet of the recirculation valve so as to provide the said control inlet with a partial vacuum which is a function of an electric signal for controlling the solenoid valve. For this purpose, the body (4) of the partial vacuum regulator is formed of a single piece with a cap (6) for closing the body (7) of the solenoid valve, a duct (34, 35) formed in the said piece causing the inside of the partial vacuum regulator body to correspond with the inside of the solenoid valve body. <IMAGE>

Description

La présente invention concerne un ensemble de commande d'une vanne de recirculation des gaz d'échappement d'un moteur à combustion interne, et plus particulièrement un tel ensemble comprenant un régulateur de dépression dont l'entrée est agencée pour être reliée à une source de dépression et une électrovanne dont l'entrée est reliée à la sortie du régulateur de dépression et dont la sortie est agencée pour être reliée à l'entrée de commande de la vanne de recirculation de manière à fournir à ladite entrée de commande une dépression fonction d'un signal électrique de commande de l'électrovanne.The present invention relates to an assembly for controlling an exhaust gas recirculation valve of an internal combustion engine, and more particularly to such an assembly comprising a vacuum regulator, the inlet of which is designed to be connected to a source. and a solenoid valve whose input is connected to the output of the vacuum regulator and whose output is arranged to be connected to the control input of the recirculation valve so as to provide said control input with a functional vacuum an electrical signal for controlling the solenoid valve.

De tels ensembles sont déjà connus et sont utilisés pour commander une vanne susceptible de mettre en communication le circuit d'échappement avec le circuit d'admission d'un moteur à combustion interne afin de recycler une partie plus ou moins importante des gaz d'échappement.Such assemblies are already known and are used to control a valve capable of putting the exhaust circuit into communication with the intake circuit of an internal combustion engine in order to recycle a more or less significant part of the exhaust gases. .

En effet, les gaz d'échappement sont inertes. Leur recyclage dans l'admission a donc pour conséquence, d'une part d'abaisser la température de combustion par absorption d'une partie de la quantité de chaleur provenant de ce processus de combustion, et d'autre part d'abaisser la vitesse de la flamme et donc d'augmenter la durée de combustion.In fact, the exhaust gases are inert. Their recycling in the intake therefore has the consequence, on the one hand of lowering the combustion temperature by absorption of part of the quantity of heat coming from this combustion process, and on the other hand of reducing the speed flame and therefore increase the burning time.

Il en résulte une diminution de la production de gaz toxiques ainsi qu'un gain en consommation de carburant.This results in a reduction in the production of toxic gases as well as a gain in fuel consumption.

Jusqu'à présent de tels ensembles étaient constitués d'éléments séparés montés inviduellement et raccordés entre-eux.Until now, such assemblies have consisted of separate elements mounted individually and connected to each other.

Il s'en suivait un encombrement important et des coûts de montage élevés.This resulted in a large size and high mounting costs.

La présente invention vise à pallier ces inconvénients.The present invention aims to overcome these drawbacks.

A cet effet, l'invention a pour objet un ensemble de commande du type ci-dessus, caractérisé par le fait que le corps du régulateur de dépression est formé d'une seule pièce avec un capot de fermeture du corps de l'électrovanne, un conduit formé dans ladite pièce faisant correspondre l'intérieur du corps du régulateur de dépression avec l'intérieur du corps de l'électrovanne.To this end, the subject of the invention is a control assembly of the above type, characterized in that the body of the vacuum regulator is formed in one piece with a cover for closing the body of the solenoid valve, a conduit formed in said part making the interior of the body of the vacuum regulator correspond with the interior of the body of the solenoid valve.

L'ensemble ainsi réalisé est particulièrement compact et il est en outre beaucoup plus facile à monter puisque ses éléments peuvent être préassemblés sur la pièce formant le corps du régulateur de dépression et le capot de fermeture du corps de l'électrovanne avant que cette dernière soit en une seule fois montée sur le moteur qu'elle doit équiper.The assembly thus produced is particularly compact and it is also much easier to assemble since its elements can be pre-assembled on the part forming the body of the vacuum regulator and the cover for closing the body of the solenoid valve before the latter is in one go mounted on the engine it must equip.

La périphérie de l'extrémité dudit conduit du côté de l'electrovanne forme de préférence un premier siège pour un organe de fermeture de l'électrovanne, la sortie de l'électrovanne étant mise à l'air libre lorsque l'organe de fermeture est appliqué sur ledit premier siège.The periphery of the end of said duct on the side of the solenoid valve preferably forms a first seat for a member for closing the solenoid valve, the outlet of the solenoid valve being vented when the closing member is applied to said first seat.

L'électrovanne peut comprendre un orifice de mise à l'air libre en vis-à-vis de ladite extrémité du conduit, la périphérie dudit orifice formant un deuxième siège pour ledit organe de fermeture, lequel est disposé entre ladite extrémité du conduit et ledit orifice, la sortie de l'électrovanne étant mise en communication avec ledit régulateur de dépression lorsque ledit organe de fermeture est appliqué sur ledit deuxième siège.The solenoid valve may include a venting opening facing said end of the conduit, the periphery of said opening forming a second seat for said closure member, which is disposed between said end of the conduit and said orifice, the outlet of the solenoid valve being placed in communication with said vacuum regulator when said closure member is applied to said second seat.

Dans un mode de réalisation particulier de l'invention, ledit organe de fermeture est agencé pour être attiré alternativement vers l'un et l'autre sièges par un électro-aimant et des moyens de rappel élastique, ledit électro-aimant étant alimenté par ledit signal électrique de commande, ledit signal étant un signal rectangulaire à fréquence sensiblement constante et à rapport cyclique variable.In a particular embodiment of the invention, said closure member is arranged to be attracted alternately to one or the other seats by an electromagnet and elastic return means, said electromagnet being powered by said electrical control signal, said signal being a rectangular signal with substantially constant frequency and variable duty cycle.

Dans ce cas, plus le rapport cyclique est grand et plus l'électrovanne est ouverte lontemps à chaque cycle. On introduit ainsi plus de dépression dans la vanne de recirculation des gaz d'échappement ce qui entraîne une plus grande ouverture de la vanne et donc une plus grande proportion de gaz d'échappement recyclé.In this case, the larger the duty cycle, the more time the solenoid valve is open for each cycle. More vacuum is thus introduced into the exhaust gas recirculation valve, which leads to a greater opening of the valve and therefore a greater proportion of recycled exhaust gas.

Ledit conduit de communication entre l'intérieur du corps de régulateur de dépression et l'intérieur du corps de l'électrovanne comporte de préférence un ajutage de régulation de débit.Said communication conduit between the interior of the vacuum regulator body and the interior of the valve body preferably includes a flow control nozzle.

Dans un mode de réalisation particulier, ce conduit est formé d'au moins deux parties de conduit débouchant l'une dans l'autre et d'axes inclinés l'un par rapport à l'autre, la première partie du conduit débouchant à l'air libre à proximité de l'emplacement où elle débouche dans la deuxième partie et ledit ajutage étant formé dans un bouchon placé dans la première partie de conduit à l'emplacement où elle débouche dans la deuxième partie en obturant la mise à l'air libre de ladite première partie.In a particular embodiment, this conduit is formed of at least two parts of conduit opening into one another and of axes inclined with respect to each other, the first part of the conduit opening out to the air near the location where it opens in the second part and said nozzle being formed in a plug placed in the first part of the duct at the location where it opens in the second part by sealing the vent free of said first part.

Le régulateur de dépression peut en outre comporter des moyens de réglage accessibles au niveau de son orifice d'entrée.The vacuum regulator may further include adjustment means accessible at its inlet orifice.

Egalement selon un mode de réalisation particulier de l'invention, le corps d'une enceinte formant réserve de dépression est réalisé d'une seule pièce avec le corps du régulateur de dépression et le capot de fermeture du corps de l'électrovanne, l'entrée du régulateur de dépression débouchant dans ladite enceinte et ladite enceinte étant susceptible d'être reliée à ladite source de dépression.Also according to a particular embodiment of the invention, the body of an enclosure forming a vacuum reserve is made in one piece with the body of the vacuum regulator and the cover closing the body of the solenoid valve, the inlet of the vacuum regulator opening into said enclosure and said enclosure being capable of being connected to said source of vacuum.

Plus particulièrement, ladite enceinte peut être fermée par un couvercle portant un clapet anti-retour dont l'entrée est dans ladite enceinte et dont la sortie est susceptible d'être reliée à ladite source de dépression.More particularly, said enclosure can be closed by a cover carrying a non-return valve whose inlet is in said enclosure and whose outlet is capable of being connected to said source of vacuum.

On décrira maintenant à titre d'exemple non limitatif un mode de réalisation particulier de l'invention en référence aux dessins schématiques annexés dans lesquels :

  • la figure 1 est une vue en coupe d'un ensemble selon l'invention,
  • la figure 2 est une vue partielle de la figure 1 à plus grande échelle, et
  • la figure 3 est une vue de détail de la figure 2 à encore plus grande échelle.
A particular embodiment of the invention will now be described by way of nonlimiting example with reference to the appended schematic drawings in which:
  • FIG. 1 is a sectional view of an assembly according to the invention,
  • FIG. 2 is a partial view of FIG. 1 on a larger scale, and
  • Figure 3 is a detail view of Figure 2 on an even larger scale.

On voit sur les figures une pièce monobloc 1 formant la paroi 2 d'une enceinte 3, le corps 4 d'un régulateur de dépression 5 et un capot 6 de fermeture du corps 7 d'une électrovanne 8.The figures show a single piece 1 forming the wall 2 of an enclosure 3, the body 4 of a vacuum regulator 5 and a cover 6 for closing the body 7 of a solenoid valve 8.

L'enceinte 3 est fermée par un couvercle 9 portant un clapet anti-retour 10. Le clapet anti-retour 10 possède une entrée constituée par un orifice 11 formé dans le couvercle 9 et une sortie 12 susceptible d'être raccordée à une source de dépression telle que l'admission d'air d'un moteur à combustion interne. L'enceinte 3 forme par conséquent une réserve de dépression.The enclosure 3 is closed by a cover 9 carrying a non-return valve 10. The non-return valve 10 has an inlet constituted by an orifice 11 formed in the cover 9 and an outlet 12 capable of being connected to a source of vacuum such as the air intake of an internal combustion engine. The enclosure 3 therefore forms a vacuum reserve.

L'espace intérieur 13 du régulateur de dépression 5 est relié par un conduit 14 à l'enceinte 3.The interior space 13 of the vacuum regulator 5 is connected by a conduit 14 to the enclosure 3.

Cet espace intérieur 13 est fermé par une membrane 15 chargée par un ressort de tarage 16 en appui d'une part sur une pièce annulaire 17 de liaison à la membrane et, d'autre part, sur une coupelle 18 muni d'une languette de guidage 19 engagée dans une rainure de guidage 20 du corps 4. Une pièce de réglage 21 coaxiale au conduit 14 et au ressort 16, possède un filetage coopérant avec un filetage correspondant de la coupelle 18 de sorte qu'une rotation de la pièce 21, entraînée par tout outillage convenable à partir de l'intérieur de l'enceinte 3, provoque un déplacement axial de la coupelle 18 et par conséquent une compression plus ou moins importante du ressort 16, et un réglage de la pression dans l'enceinte 3.This internal space 13 is closed by a membrane 15 loaded by a calibration spring 16 bearing on the one hand on an annular piece 17 for connection to the membrane and, on the other hand, on a cup 18 provided with a tongue of guide 19 engaged in a guide groove 20 of the body 4. An adjustment piece 21 coaxial with the duct 14 and the spring 16, has a thread cooperating with a corresponding thread of the cup 18 so that a rotation of the piece 21, driven by any suitable tool from inside the enclosure 3, causes an axial displacement of the cup 18 and consequently a more or less significant compression of the spring 16, and an adjustment of the pressure in the enclosure 3.

La membrane 15 porte par ailleurs un organe de fermeture 22 d'un orifice 23 de mise à l'air libre formé dans un capot 24 du régulateur de dépression 5.The membrane 15 also carries a closure member 22 of an orifice 23 for venting formed in a cover 24 of the vacuum regulator 5.

L'electrovanne 8 comporte un électro-aimant 25 alimenté par un signal rectangulaire à rapport cyclique variable et coopérant avec une armature 26 portée par une lame souple 27.The solenoid valve 8 comprises an electromagnet 25 powered by a rectangular signal with variable duty cycle and cooperating with a frame 26 carried by a flexible blade 27.

L'armature 26 porte un double organe de fermeture 28a, 28b.The frame 26 carries a double closing member 28a, 28b.

L'organe 28b se trouve en vis-à-vis d'un siège 29 formé à l'extrémité d'un conduit 30 coaxial à l'électro-aimant 25 et permettant de mettre à l'air libre l'espace 31 intérieur à l'électrovanne 8 par l'intermédiaire d'un filtre 32.The member 28b is located opposite a seat 29 formed at the end of a conduit 30 coaxial with the electromagnet 25 and making it possible to vent the interior space 31 to the solenoid valve 8 via a filter 32.

L'organe de fermeture 28a peut coopérer avec un siège 33 formé autour de l'orifice d'un perçage 34 formé dans le capot de fermeture 6 de l'électrovanne 8. Le perçage 34 communique avec un autre perçage 35 de manière à faire communiquer l'espace 31 intérieur à l'électrovanne 8 à l'espace 13 intérieur au régulateur de dépression 5. Les perçages 34 et 35 ont leurs axes perpendiculaires entre eux et situés dans un même plan.The closure member 28a can cooperate with a seat 33 formed around the orifice of a hole 34 formed in the closure cover 6 of the solenoid valve 8. The hole 34 communicates with another hole 35 so as to communicate space 31 inside the solenoid valve 8 space 13 inside the vacuum regulator 5. The holes 34 and 35 have their axes perpendicular to each other and located in the same plane.

Le perçage 35 débouche à l'extérieur de l'ensemble mais il est fermé au niveau où il débouche dans le perçage 34 par un bouchon 38 formant un ajutage 39 de régulation de débit entre les perçages 34 et 35.The bore 35 opens to the outside of the assembly but it is closed at the level where it opens into the bore 34 by a plug 38 forming a nozzle 39 for regulating the flow between the holes 34 and 35.

L'espace 31 intérieur à l'électrovanne 8 est par ailleurs relié à l'entrée de commande d'une vanne de recirculation des gaz d'échappement par l'intermédiaire d'un conduit 36.The space 31 inside the solenoid valve 8 is also connected to the control input of an exhaust gas recirculation valve via a conduit 36.

Lorsque l'électro-aimant 25 attire l'armature 26, l'organe 33 ouvre l'extrémité du perçage 34 et met par conséquent en communication l'intérieur 13 du régulateur de dépression avec la sortie 36 de l'électrovanne. La pression régulée par le régulateur 5 est par conséquent appliquée à l'entrée de commande de la vanne de recirculation des gaz d'échappement, l'organe 28b isolant l'espace 31 de la pression extérieur.When the electromagnet 25 attracts the armature 26, the member 33 opens the end of the bore 34 and consequently places the interior 13 of the vacuum regulator in communication with the outlet 36 of the solenoid valve. The pressure regulated by the regulator 5 is therefore applied to the control input of the exhaust gas recirculation valve, the member 28b isolating the space 31 from the external pressure.

Au contraire, lorsque l'organe de fermeture 28a est appliqué contre le siège 33, la pression extérieure est communiquée par le conduit 36 à l'entrée de commande de la vanne de recirculation des gaz d'échappement.On the contrary, when the closing member 28a is applied against the seat 33, the external pressure is communicated by the conduit 36 to the control input of the exhaust gas recirculation valve.

Le rapport cyclique du signal appliqué à l'électro-aimant 25 détermine par conséquent la pression moyenne appliquée à l'entrée de commande de la vanne de recirculation et par conséquent la proportion de gaz d'échappement recyclée vers l'admission.The duty cycle of the signal applied to the electromagnet 25 therefore determines the average pressure applied to the control input of the recirculation valve and therefore the proportion of exhaust gas recycled to the intake.

L'ensemble de commande ainsi réalisé est particulièrement compact, tous ces éléments étant portés par la même pièce 1. Il est en outre facile à assembler et à monter sur la moteur auquel il est destiné.The control assembly thus produced is particularly compact, all of these elements being carried by the same part 1. It is also easy to assemble and mount on the engine for which it is intended.

Claims (9)

Ensemble de commande d'une vanne de recirculation des gaz d'échappement d'un moteur à combustion interne, comprenant un régulateur de dépression (5) dont l'entrée est agencée pour être reliée à une source de dépression, et une électrovanne (8) dont l'entrée est reliée à la sortie du régulateur de dépression et dont la sortie est agencée pour être reliée à l'entrée de commande de la vanne de recirculation de manière à fournir à ladite entrée de commande une dépression fonction d'un signal électrique de commande de l'électrovanne, caractérisé par le fait que le corps (4) du régulateur de dépression est formée d'une seule pièce avec un capot de fermeture (6) du corps (7) de l'électrovanne, un conduit (34, 35) formé dans ladite pièce faisant correspondre l'intérieur du corps du régulateur de dépression avec l'intérieur du corps de l'électrovanne.Control assembly for an exhaust gas recirculation valve of an internal combustion engine, comprising a vacuum regulator (5) whose inlet is arranged to be connected to a vacuum source, and a solenoid valve (8 ) whose input is connected to the output of the vacuum regulator and whose output is arranged to be connected to the control input of the recirculation valve so as to provide said control input with a vacuum depending on a signal solenoid valve electrical control, characterized in that the body (4) of the vacuum regulator is formed in one piece with a closure cover (6) of the body (7) of the solenoid valve, a conduit ( 34, 35) formed in said part making the interior of the body of the vacuum regulator correspond with the interior of the body of the solenoid valve. Ensemble de commande selon la revendication 1, dans lequel la périphérie de l'extrémité dudit conduit du côté de l'électrovanne forme un premier siège (33) pour un organe de fermeture (28a, 28b) de l'électrovanne, la sortie de l'électrovanne étant mise à l'air libre lorsque l'organe de fermeture est appliqué sur ledit premier siège.Control assembly according to claim 1, in which the periphery of the end of said duct on the side of the solenoid valve forms a first seat (33) for a closing member (28a, 28b) of the solenoid valve, the outlet of the the solenoid valve being vented when the closure member is applied to said first seat. Ensemble de commande selon la revendication 2, dans lequel l'électrovanne comprend un orifice de mise à l'air libre en vis-à-vis de ladite extrémité du conduit, la périphérie dudit orifice formant un deuxième siège (29) pour ledit organe de fermeture, lequel est disposé entre ladite extrémité du conduit et ledit orifice, la sortie de l'électrovanne étant mise en communication avec ledit régulateur de dépression lorsque ledit organe de fermeture est appliqué sur ledit deuxième siège.Control assembly according to claim 2, in which the solenoid valve comprises a venting opening facing said end of the duct, the periphery of said opening forming a second seat (29) for said valve member. closure, which is disposed between said end of the conduit and said orifice, the outlet of the solenoid valve being placed in communication with said regulator vacuum when said closure member is applied to said second seat. Ensemble de commande selon la revendication 3, dans lequel ledit organe de fermeture est agencé pour être attiré alternativement vers l'un et l'autre siège par un électro-aimant (25) et des moyens de rappel élastiques (27), ledit électro-aimant étant alimenté par ledit signal électrique de commande, ledit signal étant un signal rectangulaire à fréquence sensiblement constante et à rapport cyclique variable.Control assembly according to claim 3, wherein said closure member is arranged to be attracted alternately to one and the other seat by an electromagnet (25) and elastic return means (27), said electromagnet magnet being supplied by said electrical control signal, said signal being a rectangular signal at substantially constant frequency and with variable duty cycle. Ensemble de commande selon l'une quelconque des revendications 1 à 4, dans lequel ledit conduit comporte un ajutage (39) de régulation de débit.Control assembly according to any one of claims 1 to 4, in which said duct comprises a flow control nozzle (39). Ensemble de commande selon la revendication 5, dans lequel ledit conduit est formé d'au moins deux parties de conduit débouchant l'une dans l'autre et d'axes inclinés l'un par rapport à l'autre, la première partie (35) de conduit débouchant à l'air libre à proximité de l'emplacement où elle débouche dans la deuxième partie (34), et ledit ajutage étant formé dans un bouchon (38) placé dans la première partie de conduit à l'emplacement où elle débouche dans la deuxième partie et obturant la mise à l'air libre de ladite première partie.Control assembly according to claim 5, in which said conduit is formed by at least two parts of conduit opening into one another and of axes inclined with respect to each other, the first part (35 ) of duct opening into the open air near the location where it opens into the second part (34), and said nozzle being formed in a plug (38) placed in the first portion of duct at the location where it opens into the second part and obturates the venting of said first part. Ensemble de commande selon l'une quelconque des revendications 1 à 6, dans lequel ledit régulateur de dépression comporte des moyens de réglage (21) accessibles au niveau de son orifice d'entrée.Control assembly according to any one of claims 1 to 6, in which said vacuum regulator comprises adjustment means (21) accessible at its inlet orifice. Ensemble de commande selon l'une quelconque des revendications 1 à 7, dans lequel le corps (2) d'une enceinte (3) formant réserve de dépression est réalisé d'une seule pièce avec le corps du régulateur de dépression et le capot de fermeture du corps de l'électrovanne, l'entrée (14) du régulateur de dépression débouchant dans ladite enceinte, et ladite enceinte étant susceptible d'être reliée à ladite source de dépression.Control assembly according to any one of Claims 1 to 7, in which the body (2) of a enclosure (3) forming a vacuum reserve is produced in one piece with the body of the vacuum regulator and the cover closing the body of the solenoid valve, the inlet (14) of the vacuum regulator opening into said enclosure, and said enclosure being capable of being connected to said source of vacuum. Ensemble de commande selon la revendication 8, dans lequel ladite enceinte est fermée par un capot (9) dont l'entrée (11) est dans ladite enceinte et dont la sortie (12) est susceptible d'être reliée à ladite source de dépression.Control assembly according to claim 8, wherein said enclosure is closed by a cover (9) whose inlet (11) is in said enclosure and whose outlet (12) is capable of being connected to said source of vacuum.
EP93402226A 1992-09-15 1993-09-14 Exhaust gas recirculation valve control assembly for an internal combustion engine Withdrawn EP0588706A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9210974A FR2695683B1 (en) 1992-09-15 1992-09-15 Control assembly for an exhaust gas recirculation valve of an internal combustion engine.
FR9210974 1992-09-15

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EP0588706A1 true EP0588706A1 (en) 1994-03-23

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EP93402226A Withdrawn EP0588706A1 (en) 1992-09-15 1993-09-14 Exhaust gas recirculation valve control assembly for an internal combustion engine

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US (1) US5337790A (en)
EP (1) EP0588706A1 (en)
JP (1) JPH06173785A (en)
FR (1) FR2695683B1 (en)

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US7086636B2 (en) 2002-07-02 2006-08-08 Borgwarner Inc. Gaseous fluid metering valve
US7607638B2 (en) 2005-03-08 2009-10-27 Borgwarner Inc. EGR valve having rest position

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US6378510B1 (en) 2000-06-30 2002-04-30 Borgwarner Inc. Exhaust gas recirculation system for an internal combustion engine having an integrated vacuum regulator and delta pressure sensor

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EP0462824A1 (en) * 1990-06-20 1991-12-27 Borg-Warner Automotive Electronic & Mechanical Systems Corporation Proportional solenoid valve controlled evaporative emissions purge system

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Publication number Priority date Publication date Assignee Title
US7086636B2 (en) 2002-07-02 2006-08-08 Borgwarner Inc. Gaseous fluid metering valve
US7487789B2 (en) 2002-07-02 2009-02-10 Borgwarner Inc. Gaseous fluid metering valve
US7607638B2 (en) 2005-03-08 2009-10-27 Borgwarner Inc. EGR valve having rest position

Also Published As

Publication number Publication date
JPH06173785A (en) 1994-06-21
US5337790A (en) 1994-08-16
FR2695683B1 (en) 1994-12-02
FR2695683A1 (en) 1994-03-18

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