EP1949514B1 - Zündkerze für einen verbrennungsmotor - Google Patents

Zündkerze für einen verbrennungsmotor Download PDF

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Publication number
EP1949514B1
EP1949514B1 EP06831242A EP06831242A EP1949514B1 EP 1949514 B1 EP1949514 B1 EP 1949514B1 EP 06831242 A EP06831242 A EP 06831242A EP 06831242 A EP06831242 A EP 06831242A EP 1949514 B1 EP1949514 B1 EP 1949514B1
Authority
EP
European Patent Office
Prior art keywords
central electrode
electrode
central
end part
coating
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
EP06831242A
Other languages
English (en)
French (fr)
Other versions
EP1949514A1 (de
Inventor
Xavier Jaffrezic
Marc Pariente
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 EP1949514A1 publication Critical patent/EP1949514A1/de
Application granted granted Critical
Publication of EP1949514B1 publication Critical patent/EP1949514B1/de
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
    • 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
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H01T13/39—Selection of materials for electrodes

Definitions

  • the invention relates to a plasma generator spark plug, used in particular for igniting internal combustion engines by electric spark.
  • FR2859830 FR2859569 , FR2859831 relate to such a spark multi-spark incorporating a series resonator.
  • the single coil winding of the winding ensures a high quality coefficient which is the ratio between the energy stored in the structure and the ohmic and dielectric losses. All the energy is stored in magnetic form and transferred to the essentially capacitive part. Furthermore, the low end portion of the coil surrounds the high end portion of the central electrode. This Electromagnetic overlap zone induces eddy currents in the central electrode which have the effect of creating additional resistance and thus reducing the overvoltage coefficient of the winding-plug assembly.
  • the invention aims at reducing the electromagnetic energy dissipation induced by the eddy currents in the central electrode so as to optimize the properties of the spark plug, in particular a high overvoltage coefficient.
  • the invention proposes a candle of the type mentioned above, characterized in that the high end portion of the central electrode comprises a coating of material which has an electrical conductivity greater than that of the material of the central electrode and which has no ferromagnetic properties.
  • the thickness of the coating is at least equal to the initial skin thickness of the central electrode.
  • the axial height of the coating is at least equal to the height of the high end portion of the central electrode.
  • 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 is a schematic sectional view along the Z axis of a portion of a radiofrequency plasma candle having a low end portion of the coil and a high end portion of the central electrode according to the state of the technical.
  • the figure 3 represents a sectional view of a central electrode according to the invention.
  • a radiofrequency plasma candle 1 of substantially cylindrical general shape Z axis mainly comprises a substantially capacitive bottom portion C and a substantially inductive upper part I, the parts C and I being substantially elongated in shape, connected in series.
  • 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 base 2 has, on the outer face of its lower part. the closest to the cylinder head of the internal combustion engine equipped with the spark plug 1, a form suitable for the introduction, maintenance and tightening of the spark plug 1 on the cylinder head (for example and without limitation, as shown on the figure 1 : a thread).
  • the essentially inductive part I of the spark plug 1 has from inside to outside: a central mandrel 8, a winding 5, an insulator 7, an outer envelope 6.
  • the central mandrel 8 is generally cylindrical in shape with a circular section whose axis is substantially coincident with the Z axis of the candle 1. It is made of insulating and non-magnetic material.
  • the winding 5 is of cylindrical general shape with circular section. It is composed of a wire of diameter D wound and forming contiguous turns 51 surrounding the central mandrel 8 from a first turn 51a to a last turn 51b, which constitute the two end turns 51a, 51b of the winding 5.
  • the first turn 51a is connected to the connector 12 and the last turn 51b is connected by appropriate means 14 to an inner end of the central electrode 3.
  • a low end portion 57 of the coil 5 surrounds a high end portion 31 of the central electrode 3 which is inserted into the mandrel 8.
  • the insulator 7 surrounding the coil 5 is of generally cylindrical shape. It can be chosen in different materials such as silicone.
  • the outer casing 6 is of generally cylindrical shape. It is connected to a mass and surrounds the winding 5.
  • the envelope 6 has an electromagnetic shielding function.
  • the envelope 6 may be chosen from a high-conductivity non-ferrous material such as copper.
  • the central electrode 3 comprises a coating 9.
  • the coating 9 is located axially on the upper end portion 31 of the central electrode 3. This coating 9 may be deposited for example by electrolysis.
  • the coating is characterized by an electrical conductivity greater than that of the material of the central electrode 3 and does not exhibit ferromagnetic properties.
  • the central electrode 3 may be chosen from nickel whose conductivity is 14.3 * 10 6 S / m (Siemens / meter) and the coating 9 may be chosen from silver whose electrical conductivity is 63 * 10 6 S / m.
  • the height H is at least equal to the height of the high end portion 31 of the central electrode 3.
  • the low end portion 57 of the coil 5 surrounding the high end portion 31 of the central electrode 3 is called the electromagnetic overlap zone A.
  • the latter A induces eddy currents in the central electrode 3.
  • the losses by Foucault current is proportional to the square of the frequency.
  • the skin thickness decreases in proportion to the square root of the permeability, frequency, electrical conductivity and size of the room. The thicker the piece in the plane perpendicular to the magnetic field than the skin thickness, the higher the induced currents will be.
  • an embodiment of the invention provides a coating 9 which replaces this skin thickness.
  • This coating 9 makes it possible to reduce the eddy currents and the skin thickness. In this way, the resistance of the central electrode 3 is decreased. The overvoltage coefficient is therefore increased and consequently the performance of the candle is improved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Spark Plugs (AREA)
  • Fats And Perfumes (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Claims (3)

  1. Zündkerze (1) mit allgemein im Wesentlichen zylindrischer Form für den Verbrennungsmotor eines Kraftfahrzeugs, umfassend:
    - einen im Wesentlichen kapazitiven inneren Teil (C), der Folgendes umfasst:
    zwei koaxiale Elektroden: eine Innenelektrode mit einer Achse (D), die als Mittelelektrode (3) bezeichnet wird, und eine Außenelektrode, die als Körper (2) bezeichnet wird und die Mittelelektrode (3) umgibt,
    einen elektrisch isolierenden Block, der als Isolierkörper (4) bezeichnet wird und zwischen der Mittelelektrode (3) und dem Körper (2) angeordnet ist,
    - einen im Wesentlichen induktiven oberen Teil (I), der Folgendes umfasst:
    einen mittleren Dorn (8), der um eine Spule (5) gewickelt ist, deren unterer Endteil (57) einen oberen Endteil (31) der Mittelelektrode (3) umgibt,
    einen äußeren Mantel (6),
    einen Isolierkörper (7), der radial zwischen dem Mantel (6) und der Spule (5) angeordnet ist,
    dadurch gekennzeichnet, dass der obere Endteil (31) der Mittelelektrode (3) eine Materialbeschichtung (9) aufweist, die:
    eine höhere elektrische Leitfähigkeit besitzt als die des Materials der Mittelelektrode (3),
    keine ferromagnetischen Eigenschaften besitzt.
  2. Zündkerze (1) nach Anspruch 1, dadurch gekennzeichnet, dass die radiale Dicke (E) der Beschichtung (9) mindestens gleich der Dicke der anfänglichen Haut der Mittelelektrode (3) ist.
  3. Zündkerze (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die axiale Höhe (H) der Beschichtung (9) mindestens gleich der Höhe des oberen Endteils (31) der Mittelelektrode (3) ist.
EP06831242A 2005-11-14 2006-09-28 Zündkerze für einen verbrennungsmotor Not-in-force EP1949514B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0553448A FR2893455B1 (fr) 2005-11-14 2005-11-14 Bougie d'allumage pour moteur a combustion interne
PCT/FR2006/050955 WO2007054648A1 (fr) 2005-11-14 2006-09-28 Bougie d'allumage pour un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1949514A1 EP1949514A1 (de) 2008-07-30
EP1949514B1 true EP1949514B1 (de) 2010-04-21

Family

ID=36641762

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06831242A Not-in-force EP1949514B1 (de) 2005-11-14 2006-09-28 Zündkerze für einen verbrennungsmotor

Country Status (12)

Country Link
US (1) US7915795B2 (de)
EP (1) EP1949514B1 (de)
JP (1) JP4869351B2 (de)
KR (1) KR20080072651A (de)
CN (1) CN101310422B (de)
AT (1) ATE465535T1 (de)
BR (1) BRPI0618542A2 (de)
DE (1) DE602006013867D1 (de)
ES (1) ES2344157T3 (de)
FR (1) FR2893455B1 (de)
RU (1) RU2402126C2 (de)
WO (1) WO2007054648A1 (de)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8614541B2 (en) * 2008-08-28 2013-12-24 Federal-Mogul Ignition Company Spark plug with ceramic electrode tip
US9219351B2 (en) 2008-08-28 2015-12-22 Federal-Mogul Ignition Company Spark plug with ceramic electrode tip
FR2944389B1 (fr) * 2009-04-14 2011-04-01 Renault Sas Resonateur-amplificateur haute tension de structure optimisee pour systeme d'allumage radiofrequence
FR2955710B1 (fr) * 2010-01-22 2012-01-13 Renault Sa Bougie, systeme d'allumage, moteur et procede d'allumage pour le moteur.
FR2964803B1 (fr) * 2010-09-10 2012-08-31 Renault Sa Bougie d'allumage pour moteur a combustion interne
FR2965984B1 (fr) * 2010-10-12 2012-10-12 Renault Sa Prevention contre un court-circuit de la bougie rf
JP5385427B2 (ja) 2011-08-04 2014-01-08 日本特殊陶業株式会社 点火プラグ、及び、点火装置
EP3012927A4 (de) * 2013-06-18 2017-03-08 Imagineering, Inc. Zündkerze und plasmaerzeugungsvorrichtung
RU2552712C1 (ru) * 2013-09-10 2015-06-10 Николай Борисович Болотин Система зажигания топливовоздушной смеси, свеча зажигания и способ воспламенения топливовоздушной смеси
KR101507092B1 (ko) * 2013-09-24 2015-03-31 서울대학교산학협력단 자기장 유도 코일이 구비된 점화 플러그
US20170152829A1 (en) * 2014-04-22 2017-06-01 Imagineering, Inc. Spark plug and socket
WO2016067209A1 (en) * 2014-10-28 2016-05-06 North-West University Ignition plug
CN109253030A (zh) * 2018-10-26 2019-01-22 大连民族大学 一种具有进气斜孔及偏心双阳极结构的等离子体点火器

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB994525A (en) * 1962-12-06 1965-06-10 Gen Motors Ltd Spark plugs
US3882341A (en) * 1974-01-24 1975-05-06 Champion Spark Plug Co Spark plug with inductive suppressor
US4029990A (en) * 1976-01-09 1977-06-14 Champion Spark Plug Company Spark plug construction
US4405429A (en) * 1980-02-15 1983-09-20 N G K Spark Plug Co., Ltd. Oxygen detector
DE3333891A1 (de) * 1983-09-20 1985-04-04 Robert Bosch Gmbh, 7000 Stuttgart Zuendkerze fuer brennkraftmaschinen
DE3347027A1 (de) * 1983-12-24 1985-07-04 Robert Bosch Gmbh, 7000 Stuttgart Zuendkerze fuer eine brennkraftmaschine
JPH04259614A (ja) * 1991-02-12 1992-09-16 Hideo Yoshikawa 内燃機関の動弁装置
JPH06159217A (ja) * 1992-11-25 1994-06-07 Toyota Motor Corp 点火プラグ装置
EP0707748B1 (de) * 1993-07-06 1998-08-26 Caterpillar Inc. Zündkerze mit automatischer einstellung des spaltes
US5706792A (en) * 1996-12-10 1998-01-13 General Motors Corporation Integrated ignition coil and spark plug
EP0893599A1 (de) * 1997-07-21 1999-01-27 Cooper Industries Italia S.p.A. Zündspule mit offenem Kern und zentralem Luftspalt
JPH11127550A (ja) * 1997-10-21 1999-05-11 Meidensha Corp 永久磁石式回転機の回転子
JP4463389B2 (ja) * 2000-06-30 2010-05-19 日本特殊陶業株式会社 内燃機関用点火装置の製造方法
FR2859869B1 (fr) * 2003-09-12 2006-01-20 Renault Sa Systeme de generation de plasma.
FR2859831B1 (fr) 2003-09-12 2009-01-16 Renault Sa Bougie de generation de plasma.
FR2859830B1 (fr) * 2003-09-12 2014-02-21 Renault Sas Bougie de generation de plasma a inductance integree.
CN1556564A (zh) * 2003-12-31 2004-12-22 天津大学 超高能火花塞
FR2859569A1 (fr) 2004-01-23 2005-03-11 Alstom T & D Sa Dispositif et procede de protection contre un arc electrique

Also Published As

Publication number Publication date
JP2009516342A (ja) 2009-04-16
DE602006013867D1 (de) 2010-06-02
JP4869351B2 (ja) 2012-02-08
BRPI0618542A2 (pt) 2011-09-06
WO2007054648A1 (fr) 2007-05-18
KR20080072651A (ko) 2008-08-06
CN101310422B (zh) 2012-06-20
EP1949514A1 (de) 2008-07-30
FR2893455B1 (fr) 2007-12-14
RU2402126C2 (ru) 2010-10-20
ATE465535T1 (de) 2010-05-15
CN101310422A (zh) 2008-11-19
RU2008123858A (ru) 2009-12-27
US7915795B2 (en) 2011-03-29
US20090091232A1 (en) 2009-04-09
FR2893455A1 (fr) 2007-05-18
ES2344157T3 (es) 2010-08-19

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