EP1920510B1 - Bougie d'allumage plasma pour un moteur a combustion interne - Google Patents

Bougie d'allumage plasma pour un moteur a combustion interne Download PDF

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Publication number
EP1920510B1
EP1920510B1 EP06794465A EP06794465A EP1920510B1 EP 1920510 B1 EP1920510 B1 EP 1920510B1 EP 06794465 A EP06794465 A EP 06794465A EP 06794465 A EP06794465 A EP 06794465A EP 1920510 B1 EP1920510 B1 EP 1920510B1
Authority
EP
European Patent Office
Prior art keywords
casing
spark plug
outer casing
inner casing
chosen
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.)
Not-in-force
Application number
EP06794465A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1920510A1 (fr
Inventor
Xavier Jaffrezic
André AGNERAY
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.)
Renault SAS
Original Assignee
Renault SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP1920510A1 publication Critical patent/EP1920510A1/fr
Application granted granted Critical
Publication of EP1920510B1 publication Critical patent/EP1920510B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01T13/40—Sparking plugs structurally combined with other devices
    • H01T13/44—Sparking plugs structurally combined with other devices with transformers, e.g. for high-frequency ignition

Definitions

  • the invention relates to a plasma generation spark plug, used in particular for igniting internal combustion engines by electric spark between the electrodes of a candle.
  • an ignition spark of an internal combustion engine comprising two electrically insulated plasma generation electrodes respectively constituting an outer cap surrounding the insulator, and a central electrode housed in a central bore of the insulator.
  • a multi-spark spark plug has an electromagnetic shielding materialized by a metal envelope that can be made, for example in the form of a shaped thin tube or a thin layer deposited or a metallized and plated plastic film, according to the preamble of claim 1.
  • the electromagnetic shield has two parts: the electrical shield and the magnetic shield.
  • the electrical shielding protects the environment of the spark plug from disturbances caused by the electric field created by the winding.
  • the magnetic shielding ensures that the magnetic field remains inside this envelope.
  • the flow of the current corresponding to the electrical shielding effects is limited to the outer face of the envelope while the current flow related to the magnetic shielding is limited to the inner face of the envelope.
  • the insulator is generally produced in materials having particular physicochemical characteristics with, as a counterpart, the coefficients of expansion as a function of the temperature of the material that can be used. to be important.
  • the invention aims to achieve an electromagnetic shielding while providing insulation between the mandrel and the envelope.
  • the invention proposes a plug of the type cited above, characterized in that the substantially inductive upper part comprises a second internal electromagnetic shielding envelope which is interposed radially between the insulator and the outer casing.
  • the inner face of the inner casing is adjacent to the outer face of the insulator.
  • the inner casing is of constant thickness.
  • the outer casing has a thickness at least equal to the skin thickness which corresponds to the penetration depth of the current lines in the outer casing.
  • the inner face of the outer casing is cylindrical in shape with a circular section
  • the outer face of the inner casing is cylindrical in shape with a polygonal section
  • the inner casing is dimensioned such that way that the axial edges of the inner casing are in electrical contact with the inner face of the outer casing.
  • the mandrel is cylindrical in shape.
  • the outer envelope is selected from electrically conductive materials such as copper.
  • the inner envelope is selected from electrically conductive materials such as copper.
  • the material of the outer envelope and the dimensions of the outer envelope are chosen so that the outer envelope shields at least the electric field produced by the winding.
  • the material of the inner envelope and the dimensions of the inner envelope are chosen so that the inner envelope electromagnetic shielding.
  • the figure 1 is a schematic sectional view along the Z axis of a radiofrequency plasma candle according to the state of the art.
  • the figure 2 represents a schematic "exploded" view of the inductive portion of a candle having two envelopes according to the invention.
  • the figure 3 is a schematic sectional view of the inductive portion of a candle having two envelopes according to the invention.
  • the figure 4 represents a schematic sectional view along the axis 4-4 'of the figure 3 according to the invention.
  • the figure 5 represents the circulation of currents related to the electromagnetic field by a sectional view along the axis 5-5 'of the figure 3 according to the invention.
  • a radiofrequency plasma plug 1 of substantially cylindrical general shape mainly comprises a substantially capacitive bottom portion C and a substantially inductive upper part I, the parts C and 1 being of substantially elongated shape, connected in series and having a common longitudinal axis Z.
  • the substantially capacitive portion C comprises, in particular, a base 2 intended to be connected to the ground and surrounding a central electrode 3, substantially cylindrical, axis Z, acting as a high voltage electrode.
  • An electrically insulating block, called “insulator 4 is placed between the base 2 and the central electrode 3, the insulator 4 being configured to guide the sparks between the electrodes 2 and 3.
  • the base 2 has, on the outer face of its lower part closest to the cylinder head of the internal combustion engine equipped with the candle 1, a shape suitable for the introduction, maintenance and tightening of the spark plug 1 on the cylinder head (for example and without limitation, as shown in FIG. figure 1 : a thread).
  • the essentially inductive part I of the spark plug 1 comprises a central mandrel 8 successively surrounded by a winding 5, an insulator 7, an inner envelope 62 and an outer envelope 61.
  • the mandrel 8 is cylindrical in shape with a circular section whose axis is substantially coincident with the axis Z of the candle 1. It is made of insulating and non-magnetic material.
  • the winding 5 is composed of turns 51 surrounding the central mandrel 8 from a first upper turn 512 to a last lower turn 513. As shown in FIG. figure 1 the first upper turn 512 is connected to the connector 12 and the last lower turn 513 is connected by appropriate means 14 to an inner end of the central electrode 3.
  • the insulator 7 which surrounds the winding 5 is of cylindrical shape with a polygonal section and is chosen from a material with low electromagnetic losses.
  • materials satisfying this property there is the family of silicones whose major disadvantage is to have a coefficient of significant thermal expansion of the order of 0.0001 K -1 .
  • the inner envelope 62 has an inner face 622 and an outer face 621. It is of cylindrical shape with polygonal section. Nevertheless, only the outer face 621 can be chosen to have a cylindrical shape with a polygonal section.
  • the inner casing 62 is made so that the inner face 622 of the inner casing 62 is adjacent to the outer face 71 of the insulator 7.
  • the inner casing 62 is selected from a conductive material in the area of frequency, located between 1 Mhz and 10MHz, claimed for the operation of this candle 1. It may be made of different metallic materials, for example copper or different materials covered on its external faces with metal salts, for example a nickel deposit by electroplating.
  • the thickness of this envelope 61 is chosen constant and sufficiently thin to ensure conductivity at low frequency.
  • the inner casing 62 may be chosen from 5 to 10 ⁇ m copper.
  • the outer casing 61 has an outer face 611 and an inner face 612. It is cylindrical in shape with circular section. But, only its inner face 612 can be chosen to have a cylindrical shape with a circular section.
  • This envelope 61 is selected from a material and is dimensioned in such a way that the circulation of the currents related to the electromagnetic shielding is ensured.
  • This outer envelope 61 is chosen from a conducting material in the frequency range, located between 1 Mhz and 10 MHz, claimed for the operation of this candle 1.
  • this envelope 61 may be made of a material with a high conductivity (such as copper: 6 ⁇ 10 7 S / m) or in a low conductivity material (such as steel: 1 x 10 7 S / m) and covered on its outer faces by a conductive layer, for example copper or silver.
  • the thickness of this envelope 61 is at least greater than the skin thickness which corresponds to the depth of penetration of the current lines in a conductor in the frequency range, located between 1 MHz and 10 MHz, claimed for the operation of this candle 1.
  • the outer casing 61 is copper, its thickness is at least of 100 ⁇ m.
  • the outer casing 61 is dimensioned such that its axial edges 613 are in electrical contact with the inner face 612 of the outer casing 61.
  • the empty zones created between the inner casing 62 and the outer casing 61 allow the insulator 7, having a high coefficient of thermal expansion, to expand by converging towards a substantially cylindrical outer shape that partially or completely empty areas.
  • the electromagnetic shielding is provided.
  • the current 10 connected to the magnetic shielding circulates mainly on the inner face 612 of the outer casing 61.
  • the current related to the electric shielding circulates mainly on the outer face 611 of the outer casing 61. It comprises, in particular, two components : a first component 111 which corresponds to the electrical charging of the capacitor located at the end of the coil 5 and a second component 112 which corresponds to the current required to block the electric field created by the coil 5.
  • This second component 112 circulates, in a first time, radially at the outer envelope 61 and the contact points 9 of the interface between the inner casing 62 and the outer casing 61. It flows, in a second step, in the inner casing 62 so to distribute itself homogeneously to shield the electric field created by the winding 5.
  • the tightening torque for the realization of the connection between the essentially capacitive part C and the essentially inductive part 1 of the spark plug 1 is transmitted by the outer casing 61.
  • the thickness of the outer casing 61 will be therefore dimensioned to ensure the transmission of this tightening torque.
  • the main advantage of this type of transmission is that it reduces the mechanical stresses to the largest radius available, where the leverage effect is optimal, thus minimizing the mechanical stresses on the materials themselves.
  • the envelopes 61, 62 can effectively provide electromagnetic shielding while respecting the function of the insulator 7 which is a high coefficient of expansion material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
EP06794465A 2005-08-25 2006-05-29 Bougie d'allumage plasma pour un moteur a combustion interne Not-in-force EP1920510B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0552562A FR2890247B1 (fr) 2005-08-25 2005-08-25 Bougie d'allumage plasma pour un moteur a combustion interne
PCT/FR2006/050486 WO2007023234A1 (fr) 2005-08-25 2006-05-29 Bougie d'allumage plasma pour un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1920510A1 EP1920510A1 (fr) 2008-05-14
EP1920510B1 true EP1920510B1 (fr) 2008-12-31

Family

ID=36190738

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06794465A Not-in-force EP1920510B1 (fr) 2005-08-25 2006-05-29 Bougie d'allumage plasma pour un moteur a combustion interne

Country Status (12)

Country Link
US (1) US7777401B2 (ko)
EP (1) EP1920510B1 (ko)
JP (1) JP4764926B2 (ko)
KR (1) KR101236308B1 (ko)
CN (1) CN101248565B (ko)
AT (1) ATE419667T1 (ko)
BR (1) BRPI0614871A2 (ko)
DE (1) DE602006004605D1 (ko)
ES (1) ES2318793T3 (ko)
FR (1) FR2890247B1 (ko)
RU (1) RU2392711C2 (ko)
WO (1) WO2007023234A1 (ko)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE544209T1 (de) * 2007-11-08 2012-02-15 Delphi Tech Inc Resonatoranordnung
JP4948515B2 (ja) * 2008-12-26 2012-06-06 日本特殊陶業株式会社 プラズマジェット点火プラグ
FR2964803B1 (fr) * 2010-09-10 2012-08-31 Renault Sa Bougie d'allumage pour moteur a combustion interne
US8839752B2 (en) * 2011-01-14 2014-09-23 John A. Burrows Corona igniter with magnetic screening
DE102012108251B4 (de) * 2011-10-21 2017-12-07 Borgwarner Ludwigsburg Gmbh Korona-Zündeinrichtung
DE102012111172B4 (de) * 2012-11-20 2016-01-28 Borgwarner Ludwigsburg Gmbh Korona-Zündeinrichtung
JP6677865B2 (ja) * 2014-08-12 2020-04-08 イマジニアリング株式会社 点火装置
CN109458285A (zh) * 2018-10-26 2019-03-12 隆成利达（大连）科技有限公司 具有环-柱双阳极结构的双电离模式等离子体点火器的点火方法
US10622788B1 (en) 2018-12-13 2020-04-14 Tenneco lnc. Corona ignition assembly including a high voltage connection and method of manufacturing the corona ignition assembly

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07211433A (ja) * 1993-11-30 1995-08-11 Yazaki Corp シールドケースを備えたシリーズギャップ付点火装置
US5549795A (en) * 1994-08-25 1996-08-27 Hughes Aircraft Company Corona source for producing corona discharge and fluid waste treatment with corona discharge
US5706792A (en) * 1996-12-10 1998-01-13 General Motors Corporation Integrated ignition coil and spark plug
DE19840765C2 (de) * 1998-09-07 2003-03-06 Daimler Chrysler Ag Verfahren und integrierte Zündeinheit für die Zündung einer Brennkraftmaschine
US6443137B1 (en) * 2000-09-08 2002-09-03 Delphi Technologies, Inc. Method of producing spark ignition assembly with integral spark plug and ignition coil
US20020101315A1 (en) * 2001-01-31 2002-08-01 Colin Hamer Ignition coil with primary winding release
US6568362B2 (en) 2001-06-12 2003-05-27 Ut-Battelle, Llc Rotating arc spark plug
EP1351356A3 (en) * 2002-04-01 2006-06-07 Denso Corporation Ignition device for an internal combustion engine
JP3849649B2 (ja) * 2002-04-01 2006-11-22 株式会社デンソー 内燃機関用点火装置およびその製造方法
DE10239409B4 (de) * 2002-08-28 2004-09-09 Robert Bosch Gmbh Vorrichtung zum Zünden eines Luft-Kraftstoff-Gemischs in einem Verbrennungsmotor
DE10239410B4 (de) * 2002-08-28 2004-12-09 Robert Bosch Gmbh Vorrichtung zum Zünden eines Luft-Kraftstoff-Gemischs in einem Verbrennungsmotor
JP3900053B2 (ja) * 2002-09-19 2007-04-04 株式会社デンソー 内燃機関用点火装置
JP4305294B2 (ja) * 2003-08-28 2009-07-29 株式会社デンソー 内燃機関用点火装置
FR2859830B1 (fr) * 2003-09-12 2014-02-21 Renault Sas Bougie de generation de plasma a inductance integree.
FR2859869B1 (fr) * 2003-09-12 2006-01-20 Renault Sa Systeme de generation de plasma.
JP2006009783A (ja) * 2004-05-21 2006-01-12 Denso Corp 内燃機関用点火装置
FR2887696B1 (fr) * 2005-06-23 2007-08-24 Renault Sas Bougie d'allumage pour moteur a combustion interne
JP4674219B2 (ja) * 2006-03-22 2011-04-20 日本特殊陶業株式会社 プラズマジェット点火プラグの点火システム
ATE544209T1 (de) * 2007-11-08 2012-02-15 Delphi Tech Inc Resonatoranordnung

Also Published As

Publication number Publication date
US7777401B2 (en) 2010-08-17
JP2009506488A (ja) 2009-02-12
DE602006004605D1 (de) 2009-02-12
BRPI0614871A2 (pt) 2012-12-04
RU2392711C2 (ru) 2010-06-20
JP4764926B2 (ja) 2011-09-07
CN101248565B (zh) 2012-06-20
RU2008111151A (ru) 2009-09-27
FR2890247A1 (fr) 2007-03-02
FR2890247B1 (fr) 2007-09-28
ES2318793T3 (es) 2009-05-01
WO2007023234A1 (fr) 2007-03-01
EP1920510A1 (fr) 2008-05-14
KR101236308B1 (ko) 2013-02-22
KR20080051130A (ko) 2008-06-10
US20090114179A1 (en) 2009-05-07
CN101248565A (zh) 2008-08-20
ATE419667T1 (de) 2009-01-15

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