EP1478846B1 - Electronic module for internal combustion engine ignition coil - Google Patents

Electronic module for internal combustion engine ignition coil Download PDF

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Publication number
EP1478846B1
EP1478846B1 EP03737343A EP03737343A EP1478846B1 EP 1478846 B1 EP1478846 B1 EP 1478846B1 EP 03737343 A EP03737343 A EP 03737343A EP 03737343 A EP03737343 A EP 03737343A EP 1478846 B1 EP1478846 B1 EP 1478846B1
Authority
EP
European Patent Office
Prior art keywords
ignition coil
module
housing
electric transformer
electronic
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 - Fee Related
Application number
EP03737343A
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German (de)
French (fr)
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EP1478846A1 (en
Inventor
Eric Cavarero
Olivier Barthomeuf
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Johnson Controls Automotive Electronics SAS
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Johnson Controls Automotive Electronics SAS
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Publication date
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Publication of EP1478846A1 publication Critical patent/EP1478846A1/en
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Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P3/00—Other installations
    • F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P13/00—Sparking plugs structurally combined with other parts of internal-combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P9/00—Electric spark ignition control, not otherwise provided for
    • F02P9/002—Control of spark intensity, intensifying, lengthening, suppression
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/02—Details
    • H01T13/04—Means providing electrical connection to sparking plugs
    • H01T13/05—Means providing electrical connection to sparking plugs combined with interference suppressing or shielding means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12—Ignition, e.g. for IC engines

Definitions

  • the present invention relates to an electronic module for ignition coil of an internal combustion engine, an ignition coil and a method of manufacturing an ignition coil.
  • the ignition coils essentially consist of a transformer intended to provide a voltage peak which, in turn, will cause a spark at the electrodes of a spark plug located inside the ignition coil. an internal combustion engine cylinder.
  • FIG. 1 schematically illustrates the prior art.
  • This figure shows an ignition coil 1 composed of a primary winding 2 and a secondary winding 3.
  • the ends of the primary winding 2 are connected on one side to the vehicle battery and on the other side side to an electronic control unit 4, and the output of the ignition coil is connected to the input of a spark plug 5.
  • diode 6 it is also known to use a diode 6 to limit the risk of an unwanted spark occurring between the electrodes of the spark plug 5 during charging of the primary 2.
  • This diode 6 can be mounted as shown in the drawing between the secondary and the primary of the ignition coil 1.
  • the present invention aims to overcome these disadvantages.
  • the invention aims to provide an electronic module capable of integrating the various electronic components that can be used in combination with the transformer of the ignition coil.
  • the various electronic components associated with the transformer part of the ignition coil are integrated in a single envelope provided with the necessary connection means so as to form an electronic module that can be mounted in a block on a single operation on the ignition coil. 'ignition.
  • said envelope defines a generally cylindrical internal volume open at its axial ends, at least a first of these ends being closed by a first cap forming a connection terminal.
  • said first cap can form the connection terminal adapted to connect said module to the input of the spark plug.
  • the second axial end of said volume may be closed by a second cap forming the connection terminal adapted to connect said module to the high voltage output of the electrical transformer of the ignition coil, said caps delimiting in said volume an enclosure in which are arranged said electronic components.
  • the second axial end of said volume is open, a partition being disposed in said volume at an axially intermediate location so as to define an enclosure in said volume with said first cap, a part of said components.
  • electronics being disposed in said enclosure and the other part of said electronic components being disposed in said volume outside said enclosure between its open end and said partition.
  • the electronic module according to the invention may comprise elastic means in said enclosure for maintaining an electrical connection between said at least two electronic components so as to form an electronic circuit.
  • These resilient means also serve to press the different electronic components against their respective connecting pieces.
  • means may be provided in said enclosure for connecting said electronic circuit to at least one of said caps and / or said partition.
  • At least one of said electronic components disposed in said enclosure is a generally cylindrical component provided at at least one of its ends with a contact pad adapted to provide an electrical connection with one of said caps and / or said partition and / or said elastic means.
  • At least one of said electronic components outside said enclosure is of the type comprising external connection wires one of these wires being electrically connected to the face of said outer partition to said enclosure.
  • At least one of said electronic components outside said enclosure may be of the type comprising external connection wires, one of these wires being electrically connected to a connection pad adapted to connect said module to the high output. ignition coil electrical transformer voltage or at the input of a spark plug.
  • At least one of said electronic components may be an electrical resistor and another electronic component may be a diode, said components being electrically connected in series.
  • the electrical resistance is arranged to be electrically connected to the high voltage output of the ignition coil electrical transformer and the diode is arranged to be electrically connected to the entrance of the candle. ignition.
  • a second object of the invention is an ignition coil of an internal combustion engine, particularly a motor vehicle, comprising an electronic module as described above.
  • this ignition coil comprises a housing forming a first housing for an electrical transformer and a conduit for electrical connection means with an inlet of a spark plug, said housing forming a second housing for said module between said housing for the electrical transformer and said conduit.
  • the ignition coil may comprise elastic means in said conduit to provide an electrical connection between said first cap and said inlet of a spark plug .
  • the coil may comprise an insulating resin overmolding said electrical transformer and extending towards said conduit to said second cap.
  • an insulating resin may overmold said electrical transformer and extend in the direction said duct to said partition.
  • the ignition coil may comprise elastic means for electrical connection between the high voltage output of the electrical transformer and said electronic module.
  • FIG. 2 shows an ignition coil 10 mounted on the cylinder head 11 of an internal combustion engine.
  • the ignition coil 10 comprises a housing 12, made of molded plastic material.
  • the housing 12 forms a first housing 13 for a transformer 14, a second housing 15 for an electronic module 16 which will be described hereinafter with reference to FIG. 3, and a conduit 17 in which a spring is disposed in a known manner. 18 providing the electrical connection between the ignition coil 10 and a spark plug (not shown) mounted at the bottom of the cylinder head well receiving the conduit 17.
  • the transformer 14 is also made in known manner with, for example, a magnetic core, a primary winding, a primary winding, a secondary winding and a secondary winding concentric and a magnetic flux return circuit.
  • the primary winding of the transformer 14 is connected to an input connector 19 of the coil, this connector being itself connected to an electronic control unit not shown.
  • An elastic contact blade 20 is connected at one of its ends to the output of the secondary winding of the transformer 14 while its other end is supported on the input terminal of the electronic module 16 which will now be described with reference to FIG.
  • This module 16 comprises a casing 21 of molded plastic delimiting a cylindrical internal space 22, for example of circular section. Each end of the volume 22 is closed by a cap 23, 24 conductor which can be for example force-fitted or glued to ensure its maintenance on the module.
  • the side walls of the volume 22 and the caps 23, 24 delimit an enclosure which receives a diode 25 and a resistor 26.
  • Each of these components is generally cylindrical and comprises two end contact pads 27, 27 ', respectively 28, 28 .
  • a spring 29 is disposed in the chamber between the components 25 and 26 so as to move them away from each other by pressing the stud 27 of the component 25 against the cap 23 and the stud 28 'of the component 26 against the cap 24, while ensuring the electrical contact between the pads 27 'and 28.
  • the components 25 and 26 form an electrical circuit whose connection terminals with the external environment are constituted by the caps 23 and 24.
  • the coil 10 it starts independently to realize the housing 12, the electrical transformer 14 and the electronic module 16.
  • the electronic module 16 is then placed in the housing 15 and the electrical transformer 14 is placed in the housing 13.
  • the contact blade 20 then bears against the cap 23.
  • An insulating resin is then poured into the housing 13 so as to overmold the transformer 14. This resin extends to the cap 23 which acts as a sealing member. This resin is then polymerized.
  • FIG. 4 essentially aims to prevent an electric arc from occurring between the terminals of the diode.
  • the casing 21 receives only the end cap 24 intended to ensure the connection with the spring 18, its other end remaining open.
  • an intermediate partition 30 is force-fitted or glued in the axially central zone of the envelope 21 so as to form a sealing element.
  • the inner walls of the envelope 21 delimit with the cap 24 and the partition 30 an enclosure 31.
  • the resistor 26 is disposed inside the enclosure 31.
  • a spring 29 is disposed between the resistor 26 and the partition 30 to apply the contact pad 28 'against the cap 24 and provide an electrical connection between the resistor and the partition 30.
  • a diode 32 is disposed in the envelope 21 between the partition 30 and the open end of this envelope.
  • This diode 32 has two connection wires, one of which 33 is soldered outside the partition 30, seen from the enclosure 31.
  • the other connection wire 34 projects outside the envelope 21.
  • the insulating resin 35 is cast in the housing to extend to the partition 30, thus overmoulding the diode 32. The risk of creating an arc between the connection son of this diode are thus limited.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Description

La présente invention concerne un module électronique pour bobine d'allumage de moteur à combustion interne, une bobine d'allumage et un procédé de fabrication d'une bobine d'allumage.The present invention relates to an electronic module for ignition coil of an internal combustion engine, an ignition coil and a method of manufacturing an ignition coil.

On sait que les bobines d'allumage sont constituées pour l'essentiel d'un transformateur destiné à fournir un pic de tension qui, à son tour, provoquera une étincelle aux électrodes d'une bougie d'allumage située à l'intérieur d'un cylindre de moteur à combustion interne.It is known that the ignition coils essentially consist of a transformer intended to provide a voltage peak which, in turn, will cause a spark at the electrodes of a spark plug located inside the ignition coil. an internal combustion engine cylinder.

La figure 1 illustre schématiquement l'art antérieur.Figure 1 schematically illustrates the prior art.

On voit sur cette figure une bobine d'allumage 1 composée d'un enroulement primaire 2 et d'un enroulement secondaire 3. Les extrémités de l'enroulement primaire 2 sont reliées d'un côté à la batterie du véhicule et de l'autre côté à une unité électronique de commande 4, et la sortie de la bobine d'allumage est connectée à l'entrée d'une bougie d'allumage 5.This figure shows an ignition coil 1 composed of a primary winding 2 and a secondary winding 3. The ends of the primary winding 2 are connected on one side to the vehicle battery and on the other side side to an electronic control unit 4, and the output of the ignition coil is connected to the input of a spark plug 5.

Il est également connu d'utiliser une diode 6 pour limiter le risque de voir se produire une étincelle non désirée entre les électrodes de la bougie 5 pendant la charge du primaire 2. Cette diode 6 peut être montée comme représentée au dessin entre le secondaire et le primaire de la bobine d'allumage 1.It is also known to use a diode 6 to limit the risk of an unwanted spark occurring between the electrodes of the spark plug 5 during charging of the primary 2. This diode 6 can be mounted as shown in the drawing between the secondary and the primary of the ignition coil 1.

II est également connu de relier l'enroulement secondaire 3 de la bobine 1 à la bougie 5 par l'intermédiaire d'une résistance 7 en série. Cette résistance a pour effet de limiter les perturbations électromagnétiques dues à l'apparition de l'étincelle.It is also known to connect the secondary winding 3 of the coil 1 to the spark plug 5 via a resistor 7 in series. This resistance has the effect of limiting electromagnetic disturbances due to the appearance of the spark.

L'intégration de ces différents éléments est délicate dans un volume réduit et coûteuse.The integration of these different elements is delicate in a small and expensive volume.

La présente invention vise à palier ces inconvénients.The present invention aims to overcome these disadvantages.

Plus précisément, l'invention a pour but de fournir un module électronique apte à intégrer les différents composants électroniques susceptibles d'être utilisés en combinaison avec le transformateur de la bobine d'allumage.More specifically, the invention aims to provide an electronic module capable of integrating the various electronic components that can be used in combination with the transformer of the ignition coil.

A cet effet, un premier objet de l'invention est un module électronique pour bobine d'allumage de moteur à combustion interne, notamment de véhicule automobile, ce module comprenant au moins :

  • une enveloppe ;
  • au moins deux composants électroniques disposés dans ladite enveloppe ;
  • des moyens pour assurer une connexion électrique en lesdits au moins deux composants électroniques de manière à former un circuit électronique ;
  • une borne de connexion apte à connecter ledit module à une sortie haute tension d'un transformateur électrique de bobine d'allumage ;
  • une borne de connexion apte à connecter ledit module à l'entrée d'une bougie d'allumage ;
  • des moyens pour relier électriquement ledit circuit électronique aux dites bornes de connexion.
For this purpose, a first object of the invention is an electronic module for ignition coil of an internal combustion engine, in particular a motor vehicle, this module comprising at least:
  • an envelope ;
  • at least two electronic components arranged in said envelope;
  • means for providing electrical connection to said at least two electronic components so as to form an electronic circuit;
  • a connection terminal adapted to connect said module to a high voltage output of an ignition coil electrical transformer;
  • a connection terminal adapted to connect said module to the input of a spark plug;
  • means for electrically connecting said electronic circuit to said connection terminals.

Ainsi, les différents composants électroniques associés à la partie transformateur de la bobine d'allumage sont intégrés dans une enveloppe unique dotée des moyens de connexion nécessaires de manière à former un module électronique susceptible d'être monté en bloc une seule opération sur la bobine d'allumage.Thus, the various electronic components associated with the transformer part of the ignition coil are integrated in a single envelope provided with the necessary connection means so as to form an electronic module that can be mounted in a block on a single operation on the ignition coil. 'ignition.

Dans un mode de réalisation particulier, ladite enveloppe définit un volume intérieur généralement cylindrique ouvert à ses extrémités axiales, au moins une première de ces extrémités étant fermée par un premier capuchon formant borne de connexion.In a particular embodiment, said envelope defines a generally cylindrical internal volume open at its axial ends, at least a first of these ends being closed by a first cap forming a connection terminal.

Plus particulièrement, ledit premier capuchon peut former la borne de connexion apte à connecter ledit module à l'entrée de la bougie d'allumage.More particularly, said first cap can form the connection terminal adapted to connect said module to the input of the spark plug.

La deuxième extrémité axiale dudit volume peut être fermée par un deuxième capuchon formant la borne de connexion apte à connecter ledit module à la sortie haute tension du transformateur électrique de la bobine d'allumage, lesdits capuchons délimitant dans ledit volume une enceinte dans laquelle sont disposés lesdits composants électroniques.The second axial end of said volume may be closed by a second cap forming the connection terminal adapted to connect said module to the high voltage output of the electrical transformer of the ignition coil, said caps delimiting in said volume an enclosure in which are arranged said electronic components.

Dans un autre mode de réalisation, la deuxième extrémité axiale dudit volume est ouverte, une cloison étant disposée dans ledit volume à un emplacement axialement intermédiaire de manière à délimiter une enceinte dans ledit volume avec ledit premier capuchon, une partie desdits composants électroniques étant disposée dans ladite enceinte et l'autre partie desdits composants électroniques étant disposée dans ledit volume à l'extérieur de ladite enceinte entre son extrémité ouverte et ladite cloison.In another embodiment, the second axial end of said volume is open, a partition being disposed in said volume at an axially intermediate location so as to define an enclosure in said volume with said first cap, a part of said components. electronics being disposed in said enclosure and the other part of said electronic components being disposed in said volume outside said enclosure between its open end and said partition.

Dans l'un ou l'autre cas, le module électronique selon l'invention peut comprendre des moyens élastiques dans ladite enceinte pour maintenir une connexion électrique entre lesdits au moins deux composants électroniques de manière à former un circuit électronique.In either case, the electronic module according to the invention may comprise elastic means in said enclosure for maintaining an electrical connection between said at least two electronic components so as to form an electronic circuit.

Ces moyens élastiques servent en outre à plaquer les différents composants électroniques contre leurs pièces de connexion respectives.These resilient means also serve to press the different electronic components against their respective connecting pieces.

Plus particulièrement, des moyens peuvent être prévus dans ladite enceinte pour connecter ledit circuit électronique à au moins l'un desdits capuchons et/ou à ladite cloison.More particularly, means may be provided in said enclosure for connecting said electronic circuit to at least one of said caps and / or said partition.

Egalement dans un mode de réalisation particulier, l'un au moins desdits composants électroniques disposés dans ladite enceinte est un composant généralement cylindrique muni à au moins une des ses extrémités d'un plot de contact apte à assurer une connexion électrique avec un desdits capuchons et/ou ladite cloison et/ou lesdits moyens élastiques.Also in a particular embodiment, at least one of said electronic components disposed in said enclosure is a generally cylindrical component provided at at least one of its ends with a contact pad adapted to provide an electrical connection with one of said caps and / or said partition and / or said elastic means.

Dans le cas où une partie des composants électroniques est disposée dans ledit volume à l'extérieur de ladite enceinte entre son extrémité ouverte et une cloison, l'un au moins desdits composants électroniques extérieurs à ladite enceinte est du type comportant des fils de connexion extérieurs, l'un de ces fils étant relié électriquement à la face de ladite cloison extérieure à ladite enceinte.In the case where a part of the electronic components is disposed in said volume outside said enclosure between its open end and a partition, at least one of said electronic components outside said enclosure is of the type comprising external connection wires one of these wires being electrically connected to the face of said outer partition to said enclosure.

Egalement dans ce cas, l'un au moins desdits composants électroniques extérieurs à ladite enceinte peut être du type comportant des fils connexion extérieurs, l'un de ces fils étant relié électriquement à un plot de connexion apte à connecter ledit module à la sortie haute tension du transformateur électrique de bobine d'allumage ou à l'entrée d'une bougie d'allumage.Also in this case, at least one of said electronic components outside said enclosure may be of the type comprising external connection wires, one of these wires being electrically connected to a connection pad adapted to connect said module to the high output. ignition coil electrical transformer voltage or at the input of a spark plug.

L'un au moins desdits composants électroniques peut être une résistance électrique et un autre composant électronique peut être une diode, lesdits composants étant reliés électriquement en série.At least one of said electronic components may be an electrical resistor and another electronic component may be a diode, said components being electrically connected in series.

Dans ce cas, et dans un mode de réalisation particulier, la résistance électrique est agencée pour être reliée électriquement à la sortie haute tension du transformateur électrique de bobine d'allumage et la diode est agencée pour être reliée électriquement à l'entrée de la bougie d'allumage.In this case, and in a particular embodiment, the electrical resistance is arranged to be electrically connected to the high voltage output of the ignition coil electrical transformer and the diode is arranged to be electrically connected to the entrance of the candle. ignition.

Un deuxième objet de l'invention est une bobine d'allumage de moteur à combustion interne, notamment de véhicule automobile, comprenant un module électronique tel que décrit ci-dessus.A second object of the invention is an ignition coil of an internal combustion engine, particularly a motor vehicle, comprising an electronic module as described above.

Dans un mode de réalisation particulier, cette bobine d'allumage comprend un boîtier formant un premier logement pour un transformateur électrique et un conduit pour des moyens de liaison électrique avec une entrée d'une bougie d'allumage, ledit boîtier formant un deuxième logement pour ledit module entre ledit logement pour le transformateur électrique et ledit conduit.In a particular embodiment, this ignition coil comprises a housing forming a first housing for an electrical transformer and a conduit for electrical connection means with an inlet of a spark plug, said housing forming a second housing for said module between said housing for the electrical transformer and said conduit.

Dans le cas où une des extrémités de l'enveloppe est fermée par un premier capuchon, la bobine d'allumage peut comprendre des moyens élastiques dans ledit conduit pour assurer une liaison électrique entre ledit premier capuchon et ladite entrée d'une bougie d'allumage.In the case where one of the ends of the envelope is closed by a first cap, the ignition coil may comprise elastic means in said conduit to provide an electrical connection between said first cap and said inlet of a spark plug .

Dans le cas où la deuxième extrémité axiale du volume défini par l'enveloppe du module est fermée par un deuxième capuchon, la bobine peut comprendre une résine isolante surmoulant ledit transformateur électrique et s'étendant en direction dudit conduit jusqu'au dit deuxième capuchon.In the case where the second axial end of the volume defined by the envelope of the module is closed by a second cap, the coil may comprise an insulating resin overmolding said electrical transformer and extending towards said conduit to said second cap.

Dans le cas, au contraire, où la deuxième extrémité axiale du volume défini par l'enveloppe est ouverte et où une cloison est disposée dans ledit volume à un emplacement axialement intermédiaire, une résine isolante peut surmouler ledit transformateur électrique et s'étendre en direction dudit conduit jusqu'à ladite cloison.In the case, on the contrary, where the second axial end of the volume defined by the envelope is open and where a partition is disposed in said volume at an axially intermediate location, an insulating resin may overmold said electrical transformer and extend in the direction said duct to said partition.

Dans tous les cas, la bobine d'allumage peut comprendre des moyens élastiques de liaison électrique entre la sortie haute tension du transformateur électrique et ledit module électronique.In all cases, the ignition coil may comprise elastic means for electrical connection between the high voltage output of the electrical transformer and said electronic module.

Un troisième objet de l'invention est un procédé de fabrication d'une bobine d'allumage pour moteur à combustion interne, notamment de véhicule automobile, ce procédé comprenant les étapes consistant à :

  • réaliser un module électronique tel que décrit ci-dessus ;
  • réaliser un transformateur électrique ;
  • réaliser un boîtier formant un premier logement pour ledit transformateur électrique, un conduit pour des moyens de liaison électrique avec une entrée de bougie d'allumage, et un deuxième logement pour ledit module entre ledit logement pour le transformateur électrique et ledit conduit ;
  • disposer ledit module électronique dans ledit deuxième logement;
  • disposer ledit transformateur électrique dans ledit premier logement ;
  • former une liaison électrique entre la sortie haute tension dudit transformateur électrique et ledit module électronique ;
  • couler une résine isolante dans ledit premier logement, ladite résine s'étendant depuis un élément d'étanchéité dudit module et surmoulant ledit transformateur électrique ;
  • polymériser ladite résine isolante.
A third object of the invention is a method of manufacturing an ignition coil for an internal combustion engine, in particular a motor vehicle, this method comprising the steps of:
  • realize an electronic module as described above;
  • make an electrical transformer;
  • providing a housing forming a first housing for said electrical transformer, a conduit for electrical connection means with a spark plug inlet, and a second housing for said module between said housing for the electrical transformer and said conduit;
  • arranging said electronic module in said second housing;
  • disposing said electrical transformer in said first housing;
  • forming an electrical connection between the high voltage output of said electrical transformer and said electronic module;
  • casting an insulating resin into said first housing, said resin extending from a sealing member of said module and overmolding said electrical transformer;
  • polymerizing said insulating resin.

On décrira maintenant à titre d'exemple non limitatif, des modes de réalisation de l'invention en référence aux dessins schématiques annexés dans lesquels :

  • la figure 1, décrite ci-dessus, illustre l'art antérieur;
  • la figure 2 est une vue en coupe d'une bobine d'allumage selon l'invention;
  • la figure 3 est une vue en coupe d'un module électronique selon l'invention, tel que celui de la bobine d'allumage de la figure 2 ;
  • la figure 4 est une vue en coupe partielle d'une bobine d'allumage selon un autre mode de réalisation.
We will now describe by way of nonlimiting example, embodiments of the invention with reference to the appended diagrammatic drawings in which:
  • Figure 1, described above, illustrates the prior art;
  • Figure 2 is a sectional view of an ignition coil according to the invention;
  • Figure 3 is a sectional view of an electronic module according to the invention, such as that of the ignition coil of Figure 2;
  • Figure 4 is a partial sectional view of an ignition coil according to another embodiment.

On voit à la figure 2 une bobine d'allumage 10 montée sur la culasse 11 d'un moteur à combustion interne.FIG. 2 shows an ignition coil 10 mounted on the cylinder head 11 of an internal combustion engine.

La bobine d'allumage 10 comporte un boîtier 12, réalisé en matière plastique moulée. Le boîtier 12 forme un premier logement 13 pour un transformateur 14, un deuxième logement 15 pour un module électronique 16 qui sera décrit ci-après en référence à la figure 3, et un conduit 17 dans lequel est disposé, de façon connue, un ressort 18 assurant la liaison électrique entre la bobine d'allumage 10 et une bougie (non représentée) montée au fond du puits de culasse recevant le conduit 17.The ignition coil 10 comprises a housing 12, made of molded plastic material. The housing 12 forms a first housing 13 for a transformer 14, a second housing 15 for an electronic module 16 which will be described hereinafter with reference to FIG. 3, and a conduit 17 in which a spring is disposed in a known manner. 18 providing the electrical connection between the ignition coil 10 and a spark plug (not shown) mounted at the bottom of the cylinder head well receiving the conduit 17.

Le transformateur 14 est également réalisé de façon connue avec, par exemple, un noyau magnétique, un bobinot primaire, un enroulement primaire, un bobinot secondaire et un enroulement secondaire concentriques et un circuit de retour de flux magnétique. L'enroulement primaire du transformateur 14 est relié à un connecteur 19 d'entrée de la bobine, ce connecteur étant lui-même relié à une unité électronique de commande non représentée.The transformer 14 is also made in known manner with, for example, a magnetic core, a primary winding, a primary winding, a secondary winding and a secondary winding concentric and a magnetic flux return circuit. The primary winding of the transformer 14 is connected to an input connector 19 of the coil, this connector being itself connected to an electronic control unit not shown.

Une lame de contact élastique 20 est reliée à une de ses extrémités à la sortie de l'enroulement secondaire du transformateur 14 tandis que son autre extrémité prend appui sur la borne d'entrée du module électronique 16 qui va maintenant être décrit en référence à la figure 3.An elastic contact blade 20 is connected at one of its ends to the output of the secondary winding of the transformer 14 while its other end is supported on the input terminal of the electronic module 16 which will now be described with reference to FIG.

Ce module 16 comprend une enveloppe 21 en matière plastique moulée délimitant un volume intérieur 22 cylindrique, par exemple à section circulaire. Chaque extrémité du volume 22 est fermée par un capuchon 23, 24 conducteur qui peut être par exemple emmanché à force ou collé pour assurer son maintien sur le module. Les parois latérales du volume 22 et les capuchons 23, 24 délimitent une enceinte qui reçoit une diode 25 et une résistance 26. Chacun de ces composants est généralement cylindrique et comporte deux plots de contact d'extrémité 27, 27', respectivement 28, 28'.This module 16 comprises a casing 21 of molded plastic delimiting a cylindrical internal space 22, for example of circular section. Each end of the volume 22 is closed by a cap 23, 24 conductor which can be for example force-fitted or glued to ensure its maintenance on the module. The side walls of the volume 22 and the caps 23, 24 delimit an enclosure which receives a diode 25 and a resistor 26. Each of these components is generally cylindrical and comprises two end contact pads 27, 27 ', respectively 28, 28 .

Un ressort 29 est disposé dans l'enceinte entre les composants 25 et 26 de manière à les écarter l'un de l'autre en pressant le plot 27 du composant 25 contre le capuchon 23 et le plot 28' du composant 26 contre le capuchon 24, tout en assurant le contact électrique entre les plots 27' et 28. Ainsi, les composants 25 et 26 forment un circuit électrique dont les bornes de connexion avec l'environnement extérieur sont constituées par les capuchons 23 et 24.A spring 29 is disposed in the chamber between the components 25 and 26 so as to move them away from each other by pressing the stud 27 of the component 25 against the cap 23 and the stud 28 'of the component 26 against the cap 24, while ensuring the electrical contact between the pads 27 'and 28. Thus, the components 25 and 26 form an electrical circuit whose connection terminals with the external environment are constituted by the caps 23 and 24.

Pour réaliser la bobine 10, on commence par réaliser indépendamment le boîtier 12, le transformateur électrique 14 et le module électronique 16. Le module électronique 16 est ensuite mis en place dans le logement 15 et le transformateur électrique 14 est mis en place dans le logement 13. La lame de contact 20 vient alors en appui contre le capuchon 23.To achieve the coil 10, it starts independently to realize the housing 12, the electrical transformer 14 and the electronic module 16. The electronic module 16 is then placed in the housing 15 and the electrical transformer 14 is placed in the housing 13. The contact blade 20 then bears against the cap 23.

Une résine isolante est ensuite coulée dans le logement 13 de manière à surmouler le transformateur 14. Cette résine s'étend jusqu'au capuchon 23 qui fait office d'élément d'étanchéité. Cette résine est ensuite polymérisée.An insulating resin is then poured into the housing 13 so as to overmold the transformer 14. This resin extends to the cap 23 which acts as a sealing member. This resin is then polymerized.

Enfin, le ressort 18 est mis en place dans le conduit 17.Finally, the spring 18 is put in place in the duct 17.

Le mode de réalisation de la figure 4 vise essentiellement à éviter qu'un arc électrique ne se produise entre les bornes de la diode.The embodiment of FIG. 4 essentially aims to prevent an electric arc from occurring between the terminals of the diode.

Dans ce mode de réalisation, l'enveloppe 21 ne reçoit que le çapuchon d'extrémité 24 destiné à assurer la liaison avec le ressort 18, son autre extrémité demeurant ouverte. En revanche, une cloison intermédiaire 30 est emmanchée à force ou collée dans la zone axialement médiane de l'enveloppe 21 de manière à former un élément d'étanchéité. Les parois intérieures de l'enveloppe 21 délimitent avec le capuchon 24 et la cloison 30 une enceinte 31.In this embodiment, the casing 21 receives only the end cap 24 intended to ensure the connection with the spring 18, its other end remaining open. On the other hand, an intermediate partition 30 is force-fitted or glued in the axially central zone of the envelope 21 so as to form a sealing element. The inner walls of the envelope 21 delimit with the cap 24 and the partition 30 an enclosure 31.

La résistance 26 est disposée à l'intérieur de l'enceinte 31. Un ressort 29 est disposé entre la résistance 26 et la cloison 30 pour appliquer le plot de contact 28' contre le capuchon 24 et assurer une connexion électrique entre la résistance et la cloison 30.The resistor 26 is disposed inside the enclosure 31. A spring 29 is disposed between the resistor 26 and the partition 30 to apply the contact pad 28 'against the cap 24 and provide an electrical connection between the resistor and the partition 30.

Une diode 32 est disposée dans l'enveloppe 21 entre la cloison 30 et l'extrémité ouverte de cette enveloppe. Cette diode 32 possède deux fils de connexion dont l'un 33 est soudé à l'extérieur de la cloison 30, vue de l'enceinte 31. L'autre fil de connexion 34 fait saillie à l'extérieur de l'enveloppe 21. La réalisation d'une bobine d'allumage conforme au mode de réalisation de la figure 4 s'effectue sensiblement de la même manière que dans le cas précédent.A diode 32 is disposed in the envelope 21 between the partition 30 and the open end of this envelope. This diode 32 has two connection wires, one of which 33 is soldered outside the partition 30, seen from the enclosure 31. The other connection wire 34 projects outside the envelope 21. The realization of an ignition coil according to the embodiment of Figure 4 is substantially in the same manner as in the previous case.

Toutefois, la résine isolante 35 est coulée dans le boîtier pour s'étendre jusqu'à la cloison 30, surmoulant ainsi la diode 32. Les risques de création d'un arc entre les fils de connexion de cette diode sont ainsi limités.However, the insulating resin 35 is cast in the housing to extend to the partition 30, thus overmoulding the diode 32. The risk of creating an arc between the connection son of this diode are thus limited.

On a décrit, en référence à la figure 4, une enveloppe qui ne reçoit qu'un seul capuchon d'extrémité. Toutefois, il serait également possible de concevoir un deuxième capuchon à l'autre extrémité qui, bien sûr, sera en partie ouvert pour laisser passer la résine.With reference to FIG. 4, an envelope has been described which receives only one end cap. However, it would also be possible to design a second cap at the other end which, of course, will be partially opened to let the resin.

Claims (13)

  1. Electronic module for an internal combustion engine, particularly a motor vehicle internal combustion engine, ignition coil, characterized in that it comprises at least:
    - a wrapper (21);
    - at least two electronic components, one of them being a diode (32) and one a resistor (26), positioned inside the said wrapper;
    - means (30, 29) for providing an electrical connection between the said at least two electronic components so as to form an electronic circuit;
    - a connection terminal (34) able to connect the said module to a high-voltage output of an ignition coil electric transformer (14);
    - a connection terminal (24) able to connect the said module to the input of a spark plug; and
    - means (28') for electrically connecting the said electronic circuit to the said connection terminals,
    - the said wrapper defining an interior volume, generally a cylindrical one, open at its axial ends, at least a first of these ends being closed by a cap (24) that forms the terminal for connecting the module to the input of the spark plug,
    - the second axial end of the said volume of the wrapper being open, a partition (30) being positioned in the said volume at an axially intermediate location so as to delimit a chamber (31) within the said volume with the said cap (24), some of the said electronic components being positioned inside the said chamber (31) and the remainder of the said electronic components being positioned in the said volume outside the said chamber between its open end and the said partition (30).
  2. Electronic module according to Claim 1, characterized in that it comprises elastic means (29) in the said chamber (31) for providing an electrical connection between the said at least two electronic components (32, 26) so as to form an electronic circuit.
  3. Electronic module according to one of Claims 1 and 2, characterized in that it comprises elastic means (29) in the said chamber (31) for connecting the resistor (26) to the said partition (30).
  4. Electronic module according to one of Claims 1 to 3, characterized in that at least one of the said electronic components (32, 26) positioned inside the said chamber (31) is a component that is generally cylindrical equipped at least at one of its ends with a contact pad (28') able to make electrical connection with the said cap (24).
  5. Electronic module according to one of Claims 1 to 4, characterized in that the resistor (32) external to the said chamber (31) is of the type comprising external connecting wires (33, 34), one of these wires being electrically connected to that face of the said partition (30) that lies outside the said chamber (31).
  6. Electronic module according to Claim 5, in which the other connecting wire (34) of the resistor (32) is electrically connected to a connection pad able to connect the said module to the high-voltage output of the ignition coil electric transformer.
  7. Internal combustion engine, particularly motor vehicle internal combustion engine, ignition coil, characterized in that it comprises an electronic module according to any one of Claims 1 to 6.
  8. Ignition coil according to Claim 7 comprising a casing (12) forming a first housing (13) for an electric transformer (14) and a conduit (17) for means (18) of electrical connection with an input of a spark plug, characterized in that the said casing forms a second housing (15) for the said module between the said housing for the electric transformer and the said conduit.
  9. Ignition coil according to Claim 8, characterized in that it comprises elastic means (18) in the said conduit to make an electrical connection between the said cap (24) and the said input of a spark plug.
  10. Ignition coil according to any one of Claims 7 to 9, characterized in that it comprises an insulating resin overmoulded over the said electric transformer and extending towards the said conduit.
  11. Ignition coil according to any one of Claims 7 to 10, characterized in that it comprises an insulating resin (35) overmoulded over the said electric transformer and extending towards the said conduit as far as the said partition (30).
  12. Ignition coil according to any one of Claims 7 to 11, characterized in that it comprises elastic means providing an electrical connection (20) between the high-voltage output of the electric transformer and the said electronic module.
  13. Method of manufacturing an ignition coil for an internal combustion engine, particularly a motor vehicle internal combustion engine, characterized in that it comprises the steps consisting in:
    - producing an electronic module (16) according to any one of Claims 1 to 6;
    - producing an electric transformer (14);
    - producing a casing (12) forming a first housing (13) for the said electric transformer, a conduit (17) for means of electrical connection with an input of a spark plug, and a second housing (15) for the said module between the said housing for the electric transformer and the said conduit;
    - placing the said electronic module in the said second housing;
    - placing the said electric transformer in the said first housing;
    - making an electrical connection (20) between the high-voltage output of the said electric transformer and the said electronic module;
    - pouring an insulating resin (35) into the said first housing, the said resin extending from a sealing element (30) of the said module and overmoulding the said electric transformer;
    - curing the said insulating resin.
EP03737343A 2002-02-08 2003-02-06 Electronic module for internal combustion engine ignition coil Expired - Fee Related EP1478846B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0201576A FR2835886B1 (en) 2002-02-08 2002-02-08 ELECTRONIC MODULE FOR INTERNAL COMBUSTION ENGINE IGNITION COIL
FR0201576 2002-02-08
PCT/FR2003/000378 WO2003067078A1 (en) 2002-02-08 2003-02-06 Electronic module for internal combustion engine ignition coil

Publications (2)

Publication Number Publication Date
EP1478846A1 EP1478846A1 (en) 2004-11-24
EP1478846B1 true EP1478846B1 (en) 2007-11-28

Family

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Application Number Title Priority Date Filing Date
EP03737343A Expired - Fee Related EP1478846B1 (en) 2002-02-08 2003-02-06 Electronic module for internal combustion engine ignition coil

Country Status (8)

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US (1) US20050161031A1 (en)
EP (1) EP1478846B1 (en)
JP (1) JP4376062B2 (en)
CN (1) CN100507261C (en)
AU (1) AU2003226864A1 (en)
DE (1) DE60317773T2 (en)
FR (1) FR2835886B1 (en)
WO (1) WO2003067078A1 (en)

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Publication number Priority date Publication date Assignee Title
JP4209407B2 (en) * 2005-05-19 2009-01-14 三菱電機株式会社 Ignition device for internal combustion engine
KR100844553B1 (en) * 2006-08-24 2008-07-08 현대자동차주식회사 Assembly of ignition coil for engine
CN104226849A (en) * 2014-08-22 2014-12-24 重庆从仁机电有限公司 Processing method of spark plug cap ceramic resistor
JP6537445B2 (en) * 2015-11-26 2019-07-03 日立オートモティブシステムズ阪神株式会社 Ignition coil for internal combustion engine
US10622140B2 (en) 2016-07-21 2020-04-14 Borgwarner Ludwigsburg Gmbh High voltage contact for an ignition coil
US10916370B2 (en) * 2018-03-09 2021-02-09 GM Global Technology Operations LLC Engine assembly with vibration-isolated ignition coil apparatus
JP2020056362A (en) * 2018-10-03 2020-04-09 ダイヤモンド電機株式会社 Ignition coil for internal combustion engine

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FR2606833B1 (en) * 1986-11-18 1989-02-24 Peugeot IGNITION DEVICE FOR A COMBUSTION ENGINE
DE3732827A1 (en) * 1987-09-29 1989-04-06 Beru Werk Ruprecht Gmbh Co A High-voltage ignition system
DE69103553T2 (en) * 1990-03-08 1995-03-02 Nippon Denso Co Ignition coil for internal combustion engines.
DE4117808C2 (en) * 1991-05-31 1994-09-22 Bosch Gmbh Robert Ignition systems for internal combustion engines with high-voltage switches
JP2981702B2 (en) * 1992-08-27 1999-11-22 愛三工業株式会社 Ignition coil for internal combustion engine
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JP3131669B2 (en) * 1992-11-10 2001-02-05 本田技研工業株式会社 Spark plug cap integrated with ignition coil
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JP3708799B2 (en) * 2000-06-15 2005-10-19 三菱電機株式会社 Ignition coil for internal combustion engine
DE60009055T2 (en) * 2000-07-28 2005-02-17 Federal-Mogul Ignition S.R.L. Ignition coil for motor vehicles
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JP4209400B2 (en) * 2005-03-23 2009-01-14 三菱電機株式会社 Ignition device for internal combustion engine

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Publication number Publication date
DE60317773D1 (en) 2008-01-10
DE60317773T2 (en) 2008-12-24
EP1478846A1 (en) 2004-11-24
JP2005529263A (en) 2005-09-29
CN100507261C (en) 2009-07-01
FR2835886A1 (en) 2003-08-15
US20050161031A1 (en) 2005-07-28
AU2003226864A1 (en) 2003-09-02
CN1646803A (en) 2005-07-27
FR2835886B1 (en) 2004-11-12
WO2003067078A1 (en) 2003-08-14
JP4376062B2 (en) 2009-12-02

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