EP1732187B1 - Radiofrequency plasma spark plug for controlled ignition of internal combustion engines - Google Patents

Radiofrequency plasma spark plug for controlled ignition of internal combustion engines Download PDF

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Publication number
EP1732187B1
EP1732187B1 EP06300557A EP06300557A EP1732187B1 EP 1732187 B1 EP1732187 B1 EP 1732187B1 EP 06300557 A EP06300557 A EP 06300557A EP 06300557 A EP06300557 A EP 06300557A EP 1732187 B1 EP1732187 B1 EP 1732187B1
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EP
European Patent Office
Prior art keywords
wire
winding
spark plug
plasma spark
internal combustion
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Active
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EP06300557A
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German (de)
French (fr)
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EP1732187A1 (en
Inventor
Xavier Jaffrezic
André AGNERAY
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Renault SAS
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Renault SAS
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Publication of EP1732187A1 publication Critical patent/EP1732187A1/en
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Classifications

    • 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
    • H01T13/50—Sparking plugs having means for ionisation of gap
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/06—Coil winding
    • H01F41/098—Mandrels; Formers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • H01F27/325—Coil bobbins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/327—Encapsulating or impregnating
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12—Insulating of windings
    • H01F41/127—Encapsulating or impregnating

Definitions

  • the present invention relates to a radiofrequency plasma plug, of the type comprising a coil which constitutes the inductive part of a high voltage series resonator in the field of radio frequencies.
  • This type of candle is used in particular for the controlled ignition of internal combustion engines, and in particular described in the applications for FR-A-2859830 , FR-A-2859869 and FR-A-2859831 .
  • a spark plug of this type is represented in FIG. 1 and comprises in particular a connection terminal 1, connected to a first end of an inductive winding 2.
  • the second end of the inductive winding 2 is connected to an inner end of the central high voltage electrode. 3.
  • This end is also in contact with an insulating element 4 forming the capacitor of the resonator.
  • the electrodes 3 and 5 are separated by the dielectric material 6 for guiding the sparks between these electrodes. The spark plug is thus used to maintain a high alternating and high frequency voltage between the electrodes 3 and 5.
  • the winding is formed of a single layer of turns of an enameled conductive wire, wound on the mandrel so as to form contiguous turns.
  • the number of turns must be adapted so that the spiral turn voltage always remains lower than the insulation voltage of the enamel coating the wire, the minimum number of turns being otherwise constrained by the voltage service of the high voltage resonator.
  • the coil of the resonator in order to function correctly in high voltage, the coil of the resonator must be molded in the electrical insulating material constituting the insulation sleeve without any inclusion of air bubbles.
  • the enamel insulation of the wire does not always allow good adhesion of this insulating material, which can promote a detachment of the insulating material, causing a rapid degradation of the properties of the resonator.
  • the present invention aims to solve this problem and aims in particular to provide a more efficient and reliable plasma candle.
  • the subject of the invention is a radiofrequency plasma spark plug for the controlled ignition of internal combustion engines, comprising a winding of an electrically conductive wire which constitutes the inductive part of a high voltage series resonator. the field of radio frequencies, the winding being molded in an electrically insulating material, characterized in that the winding is formed of a bare wire wound on an insulating mandrel in non-contiguous turns.
  • a bare wire thus unglazed, makes it possible to use, for the insulating sleeve, insulating materials having strong adhesion capacities on the metals, which thus eliminates the problems of adhesion to the enamel and allows of guarantee that there will be no detachment between the conductive wire and the insulation.
  • the spacing between the turns allows the insulating material of the sleeve to penetrate, during molding, between the turns and up to the mandrel, which was not possible with a coil formed of contiguous turns, where cavities remain. between two contiguous turns and the mandrel. It therefore follows from the invention that the insulating material can completely coat each turn, and even adhere to the surface of the mandrel.
  • the insulating molding material of the sleeve can have electrical insulation properties more satisfactory than those of enamel enamel enamelled son according to the prior art. As a result, the spacing between two adjacent turns can be reduced, since it is no longer conditioned by the thickness of the enamel of each turn.
  • the mandrel is threaded and the son is wound by being placed in the hollow of the thread formed on the mandrel. It is therefore the pitch of the thread that determines the spacing between turns, more precisely the spacing between the threads of two neighboring turns.
  • the shape of the net is adapted according to the diameter of the wire used, so that there is no cavity between the son and the mandrel, which would be for example the case if the wire was placed in a net of triangular section, where a cavity would remain between the angle of the bottom of the net and the wire of circular section.
  • a curved profile thread will thus be used and such that the radius of curvature of the thread root is greater than the radius of the wound thread.
  • a net 10 is formed on the surface of the mandrel 9.
  • the profile of this net is arcuate with a radius of curvature substantially greater than the radius of the wire 11 constituting the winding, so that, for each turn, the wire rests at the bottom of the thread in a linear contact, allowing the insulating molding material to completely embed the wire by fitting during molding, as shown by the arrows F, to the mandrel.
  • the pitch of the net is predetermined so that the lines of the magnetic field created around a conductive wire by the other neighboring turns do not substantially disturb the flow of current in the section of the wire considered, and for each of the turns of the coil. This finally makes it possible to favorably increase the coefficient of overvoltage of the resonator.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

The radio-frequency plasma plug, containing an inner winding (2) of an electrical conductor wire that forms the inductive part of a high-tension resonator, moulded in an insulating material, has the winding in the form of a bare wire (11) wound on the threaded surface (10) of an insulating mandrel (9) in non-contacting coils. The wire is laid in the thread recesses, which are curved in shape and have a radius of curvature greater than that of the wire.

Description

La présente invention concerne une bougie à plasma radiofréquence, du type comportant un bobinage qui constitue la partie inductive d'un résonateur série haute tension dans le domaine des radiofréquences. Ce type de bougie est notamment utilisé pour l'allumage commandé de moteurs à combustion interne, et notamment décrit dans les demandes de brevet FR-A-2859830 , FR-A-2859869 et FR-A-2859831 .The present invention relates to a radiofrequency plasma plug, of the type comprising a coil which constitutes the inductive part of a high voltage series resonator in the field of radio frequencies. This type of candle is used in particular for the controlled ignition of internal combustion engines, and in particular described in the applications for FR-A-2859830 , FR-A-2859869 and FR-A-2859831 .

Une bougie de ce type est représentée figure 1 et comporte notamment une borne de connexion 1, connectée à une première extrémité d'un bobinage inductif 2. La deuxième extrémité du bobinage inductif 2 est connectée à une extrémité interne de l'électrode haute tension centrale 3. Cette extrémité est également en contact avec un élément isolant 4 formant le condensateur du résonateur. Les électrodes 3 et 5 sont séparées par le matériau diélectrique 6 destiné au guidage des étincelles entre ces électrodes. La bougie est ainsi utilisée pour entretenir une haute tension alternative et haute fréquence entre les électrodes 3 et 5. Un blindage 7, de préférence constitué d'un matériau non ferreux à conductivité élevée, tel que le cuivre, et connecté à une masse, entoure le bobinage inductif 2, dont il est séparé par un manchon d'isolation 8 en un matériau électriquement isolant, par exemple en une résine de silicone. Par ailleurs, le bobinage 2 est enroulé autour d'un mandrin 9 réalisé en matériau isolant et amagnétique.A spark plug of this type is represented in FIG. 1 and comprises in particular a connection terminal 1, connected to a first end of an inductive winding 2. The second end of the inductive winding 2 is connected to an inner end of the central high voltage electrode. 3. This end is also in contact with an insulating element 4 forming the capacitor of the resonator. The electrodes 3 and 5 are separated by the dielectric material 6 for guiding the sparks between these electrodes. The spark plug is thus used to maintain a high alternating and high frequency voltage between the electrodes 3 and 5. A shield 7, preferably made of a non-ferrous material of high conductivity, such as copper, and connected to a mass, surrounds the inductive winding 2, from which it is separated by an insulating sleeve 8 made of an electrically insulating material, for example a silicone resin. Furthermore, the winding 2 is wound around a mandrel 9 made of insulating and non-magnetic material.

Afin de conférer au bobinage des caractéristiques les plus proches de celles d'une inductance parfaite, le bobinage est formé d'une seule couche de spires d'un fil conducteur émaillé, enroulé sur le mandrin de manière à former des spires jointives.In order to give the winding characteristics closest to those of a perfect inductance, the winding is formed of a single layer of turns of an enameled conductive wire, wound on the mandrel so as to form contiguous turns.

En conséquence, le nombre de spires doit être adapté de façon que la tension de spire à spire reste toujours inférieure à la tension d'isolation de l'émail d'enrobage du fil, le nombre minimum de spires étant par ailleurs contraint par la tension de service du résonateur haute tension.Consequently, the number of turns must be adapted so that the spiral turn voltage always remains lower than the insulation voltage of the enamel coating the wire, the minimum number of turns being otherwise constrained by the voltage service of the high voltage resonator.

Afin de minimiser la résistance électrique d'ensemble du bobinage, on utilise des fils dont le diamètre permet d'en minimiser la résistance linéique. On sait aussi que, dans le domaine des hautes fréquences, le courant électrique circule au voisinage de la surface du fil conducteur, par le phénomène connu sous le nom "d'effet de peau". Il est ainsi connu d'utiliser, dans le domaine des hautes fréquences et des courants forts, correspondant au domaine d'application du bobinage aux bougies plasma, des fils conducteurs multibrins isolés, appelés aussi fil de Litz. L'utilisation d'un tel fil conducteur multiplie la surface périphérique des éléments conducteurs sans augmenter sensiblement la section globale, ce qui, à section constante, améliore la conductivité du fil conducteur et donc le coefficient de surtension du résonateur ainsi constitué. Toutefois, en raison des contraintes d'encombrement particulières aux bobines des bougies plasma, le fil de Litz requis pour réaliser ces bobines devrait être d'un diamètre trop fin par rapport à ce qui est techniquement réalisable à ce jour. Ce point contraint donc à l'utilisation d'un fil monobrin.In order to minimize the overall electrical resistance of the winding, wires whose diameter makes it possible to minimize their linear resistance are used. It is also known that, in the field of high frequencies, the electric current flows in the vicinity of the surface of the conductive wire, by the phenomenon known as "skin effect". It is thus known to use, in the field of high frequencies and high currents, corresponding to the field of application of the plasma candle winding, isolated multi-stranded conductive wires, also called Litz wires. The use of such a conductive wire multiplies the peripheral surface of the conductive elements without substantially increasing the overall section, which, in constant section, improves the conductivity of the conductive wire and therefore the overvoltage coefficient of the resonator thus formed. However, because of the particular space requirements of the plasma candle coils, the Litz wire required to make these coils should be of a diameter too fine compared to what is technically feasible to date. This point therefore forces the use of a single strand wire.

Par ailleurs, afin de fonctionner correctement en haute tension, le bobinage du résonateur doit être moulé dans le matériau isolant électrique constituant le manchon d'isolation sans aucune inclusion de bulles d'air. Or l'émail d'isolation du fil ne permet pas toujours une bonne adhésion de ce matériau isolant, ce qui peut favoriser un décollement du matériau isolant, provoquant une dégradation rapide des propriétés du résonateur.Moreover, in order to function correctly in high voltage, the coil of the resonator must be molded in the electrical insulating material constituting the insulation sleeve without any inclusion of air bubbles. However, the enamel insulation of the wire does not always allow good adhesion of this insulating material, which can promote a detachment of the insulating material, causing a rapid degradation of the properties of the resonator.

La présente invention a pour but de résoudre ce problème et vise en particulier à fournir une bougie plasma plus efficace et plus fiable.The present invention aims to solve this problem and aims in particular to provide a more efficient and reliable plasma candle.

Avec ces objectifs en vue, l'invention a pour objet une bougie à plasma radiofréquence pour l'allumage commandé de moteurs à combustion interne, comportant un bobinage d'un fil électriquement conducteur qui constitue la partie inductive d'un résonateur série haute tension dans le domaine des radiofréquences, le bobinage étant moulé dans un matériau électriquement isolant, caractérisé en ce que le bobinage est formé d'un fil nu bobiné sur un mandrin isolant en spires non jointives.With these objectives in view, the subject of the invention is a radiofrequency plasma spark plug for the controlled ignition of internal combustion engines, comprising a winding of an electrically conductive wire which constitutes the inductive part of a high voltage series resonator. the field of radio frequencies, the winding being molded in an electrically insulating material, characterized in that the winding is formed of a bare wire wound on an insulating mandrel in non-contiguous turns.

L'utilisation d'un fil nu, donc non émaillé, permet d'utiliser pour le manchon isolant des matériaux isolants ayant des capacités fortes d'adhésion sur les métaux, ce qui supprime donc les problèmes d'adhésion sur l'émail et permet de garantir qu'il n'y aura pas de décollement entre le fil conducteur et l'isolant. Par ailleurs, l'écartement entre les spires permet au matériau isolant du manchon de pénétrer, lors du moulage, entre les spires et jusqu'au mandrin, ce qui n'était pas possible avec un bobinage formé de spires jointives, où des cavités subsistent entre deux spires jointives et le mandrin. Il résulte donc de l'invention que le matériau isolant peut enrober complètement chaque spire, et même venir adhérer sur la surface du mandrin.The use of a bare wire, thus unglazed, makes it possible to use, for the insulating sleeve, insulating materials having strong adhesion capacities on the metals, which thus eliminates the problems of adhesion to the enamel and allows of guarantee that there will be no detachment between the conductive wire and the insulation. Moreover, the spacing between the turns allows the insulating material of the sleeve to penetrate, during molding, between the turns and up to the mandrel, which was not possible with a coil formed of contiguous turns, where cavities remain. between two contiguous turns and the mandrel. It therefore follows from the invention that the insulating material can completely coat each turn, and even adhere to the surface of the mandrel.

Un autre avantage est que le matériau isolant de moulage du manchon peut avoir des propriétés d'isolation électriques plus satisfaisantes que celles de l'émail d'enrobage des fils émaillés selon l'art antérieur. Il en résulte que l'entraxe entre deux spires adjacentes peut être réduit, puisque n'étant plus conditionné par l'épaisseur de l'émail de chaque spire.Another advantage is that the insulating molding material of the sleeve can have electrical insulation properties more satisfactory than those of enamel enamel enamelled son according to the prior art. As a result, the spacing between two adjacent turns can be reduced, since it is no longer conditioned by the thickness of the enamel of each turn.

Selon un mode de réalisation préféré, afin de garantir un espacement entre spires constant et correspondant à l'espace souhaité, le mandrin est fileté et le fils est bobiné en étant placé dans le creux du filet formé sur le mandrin. C'est donc le pas du filet qui détermine l'écartement entre spires, plus précisément l'entraxe entre les fils de deux spires voisines.According to a preferred embodiment, to ensure a spacing between turns constant and corresponding to the desired space, the mandrel is threaded and the son is wound by being placed in the hollow of the thread formed on the mandrel. It is therefore the pitch of the thread that determines the spacing between turns, more precisely the spacing between the threads of two neighboring turns.

La forme du filet est adaptée en fonction du diamètre du fil utilisé, de manière qu'il ne subsiste pas de cavité entre les fils et le mandrin, ce qui serait par exemple le cas si le fil était placé dans un filet de section triangulaire, où une cavité subsisterait entre l'angle du fond du filet et le fil de section circulaire. Préférentiellement, on utilisera donc un filetage de profil courbe et tel que le rayon de courbure du fond de filet soit supérieur au rayon du fil bobiné. Une telle réalisation fait que le fil est en contact avec le mandrin selon une seule ligne, autorisant le matériau isolant de moulage à s'insérer entre les spires en enrobant parfaitement le fil, jusqu'à la surface du mandrin.The shape of the net is adapted according to the diameter of the wire used, so that there is no cavity between the son and the mandrel, which would be for example the case if the wire was placed in a net of triangular section, where a cavity would remain between the angle of the bottom of the net and the wire of circular section. Preferably, a curved profile thread will thus be used and such that the radius of curvature of the thread root is greater than the radius of the wound thread. Such an embodiment causes the wire to contact the mandrel in a single line, allowing the insulating molding material to be inserted between the turns by perfectly encasing the wire to the surface of the mandrel.

Un exemple de réalisation d'une bougie plasma conforme à l'invention va maintenant être décrit.An embodiment of a plasma candle according to the invention will now be described.

On se reportera aux dessins annexés dans lesquels :

  • la figure 1 est une vue en coupe d'une bougie plasma selon l'art antérieur, et a déjà été commentée au début de ce mémoire,
  • la figure 2 est une vue de détail en coupe axiale de la disposition des spires du bobinage, selon l'invention.
Reference is made to the accompanying drawings in which:
  • FIG. 1 is a sectional view of a plasma candle according to the prior art, and has already been discussed at the beginning of this specification,
  • FIG. 2 is a detail view in axial section of the arrangement of the turns of the winding, according to the invention.

Comme on le voit clairement sur cette figure, un filet 10 est réalisé à la surface du mandrin 9. Le profil de ce filet est en arc de cerce de rayon de courbure sensiblement supérieur au rayon du fil 11 constitutif du bobinage, de sorte que, pour chaque spire, le fil repose au fond du filet selon un contact linéique, permettant au matériau de moulage isolant d'enrober totalement le fil en s'insérant lors du moulage, comme le montre les flèches F, jusqu'au mandrin.As is clearly seen in this figure, a net 10 is formed on the surface of the mandrel 9. The profile of this net is arcuate with a radius of curvature substantially greater than the radius of the wire 11 constituting the winding, so that, for each turn, the wire rests at the bottom of the thread in a linear contact, allowing the insulating molding material to completely embed the wire by fitting during molding, as shown by the arrows F, to the mandrel.

On notera que la possibilité de prévoir un écartement des spires non conditionné par le diamètre extérieur de l'enrobage en émail comme dans l'art antérieur, permet d'optimiser la répartition de la circulation des courants dans la section du fil. Pour cela, on prédétermine le pas du filet de sorte que les lignes du champ magnétique créé autour d'un fil conducteur par les autres spires voisines ne perturbe pas sensiblement la circulation du courant dans la section du fil considéré, et ce pour chacune des spires de la bobine. Ceci permet finalement d'accroître favorablement le coefficient de surtension du résonateur.It will be noted that the possibility of providing a spacing of the turns not conditioned by the outer diameter of the enamel coating as in the prior art makes it possible to optimize the distribution of the flow of currents in the section of the wire. For this, the pitch of the net is predetermined so that the lines of the magnetic field created around a conductive wire by the other neighboring turns do not substantially disturb the flow of current in the section of the wire considered, and for each of the turns of the coil. This finally makes it possible to favorably increase the coefficient of overvoltage of the resonator.

Claims (3)

  1. Radiofrequency plasma spark plug for the controlled ignition of internal combustion engines, comprising a winding (2) of an electrically conductive wire which constitutes the inductive part of a high-voltage series resonator in the radiofrequency domain, the winding being moulded in an electrically insulating material (8), characterized in that the winding (2) comprises a bare wire (11) wound on an insulating core (9) in non-adjacent turns.
  2. Plasma spark plug according to Claim 1, characterized in that the core (9) is threaded and the wire (11) is wound by being positioned in the hollow of the thread (10) formed on the core.
  3. Plasma spark plug according to Claim 2, characterized in that the thread (10) has a curved profile such that the curve radius of the thread bottom is greater than the radius of the wound wire (11).
EP06300557A 2005-06-08 2006-06-02 Radiofrequency plasma spark plug for controlled ignition of internal combustion engines Active EP1732187B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0505802A FR2887083B1 (en) 2005-06-08 2005-06-08 RADIOFREQUENCY PLASMA CANDLE FOR IGNITION CONTROL OF INTERNAL COMBUSTION ENGINES

Publications (2)

Publication Number Publication Date
EP1732187A1 EP1732187A1 (en) 2006-12-13
EP1732187B1 true EP1732187B1 (en) 2007-07-18

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EP06300557A Active EP1732187B1 (en) 2005-06-08 2006-06-02 Radiofrequency plasma spark plug for controlled ignition of internal combustion engines

Country Status (5)

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EP (1) EP1732187B1 (en)
AT (1) ATE367671T1 (en)
DE (1) DE602006000042T2 (en)
ES (1) ES2286812T3 (en)
FR (1) FR2887083B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102884686A (en) * 2010-04-16 2013-01-16 雷诺股份公司 Spark plug provided with a means for preventing short circuits

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2065907A1 (en) * 2007-11-08 2009-06-03 Delphi Technologies, Inc. Coil assembly
FR2943724B1 (en) * 2009-03-24 2013-11-29 Vibro Meter France HIGH ENERGY IGNITION GENERATOR, IN PARTICULAR FOR GAS TURBINE

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3794928B2 (en) * 2000-04-17 2006-07-12 東京精電株式会社 Low noise and low loss reactor
FR2859830B1 (en) * 2003-09-12 2014-02-21 Renault Sas PLASMA GENERATION CANDLE WITH INTEGRATED INDUCTANCE.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102884686A (en) * 2010-04-16 2013-01-16 雷诺股份公司 Spark plug provided with a means for preventing short circuits

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Publication number Publication date
FR2887083B1 (en) 2007-08-10
EP1732187A1 (en) 2006-12-13
FR2887083A1 (en) 2006-12-15
DE602006000042T2 (en) 2008-04-17
ES2286812T3 (en) 2007-12-01
DE602006000042D1 (en) 2007-08-30
ATE367671T1 (en) 2007-08-15

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