EP2337173A2 - Dispositif d'allumage HF - Google Patents

Dispositif d'allumage HF Download PDF

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Publication number
EP2337173A2
EP2337173A2 EP10014169A EP10014169A EP2337173A2 EP 2337173 A2 EP2337173 A2 EP 2337173A2 EP 10014169 A EP10014169 A EP 10014169A EP 10014169 A EP10014169 A EP 10014169A EP 2337173 A2 EP2337173 A2 EP 2337173A2
Authority
EP
European Patent Office
Prior art keywords
ignition device
housing body
coating
insulator body
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10014169A
Other languages
German (de)
English (en)
Other versions
EP2337173A3 (fr
Inventor
Tom Achstätter
Gerd Bräuchle
Hans Delesky
Thomas Giffels
Felizitas Heilmann
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.)
BorgWarner Ludwigsburg GmbH
Original Assignee
BorgWarner Beru Systems GmbH
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 BorgWarner Beru Systems GmbH filed Critical BorgWarner Beru Systems GmbH
Publication of EP2337173A2 publication Critical patent/EP2337173A2/fr
Publication of EP2337173A3 publication Critical patent/EP2337173A3/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • H01T13/36—Sparking plugs characterised by features of the electrodes or insulation characterised by the joint between insulation and body, e.g. using cement
    • 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
    • H01T23/00—Apparatus for generating ions to be introduced into non-enclosed gases, e.g. into the atmosphere

Definitions

  • the invention relates to a high-frequency ignition device with the features specified in the preamble of claim 1.
  • a high-frequency ignition device is from the EP 1 515 594 A2 known.
  • the center electrode of such an RF ignition device is excited with a suitable circuit, for example an RF resonant circuit.
  • the center electrode then radiates high-frequency electromagnetic waves into the combustion chamber of the engine, so that a plasma is generated there, which causes an ignition.
  • HF igniters which cause ignition by a corona discharge are an alternative to conventional spark plugs, which cause ignition by means of an arc discharge and by electrode burn considerable wear subject. HF ignition devices have the potential of a longer life, but could not fulfill this so far.
  • the object of the invention is therefore to show a way how the life of a HF ignition device can be improved.
  • an HF ignition device In order to excite the center electrode for emitting high-frequency electromagnetic waves, an HF ignition device includes a circuit, usually a resonant circuit or, for example, a piezoelectric RF generator.
  • a circuit usually a resonant circuit or, for example, a piezoelectric RF generator.
  • One element of this circuit is a capacitor whose dielectric is formed by the insulator body.
  • the dielectric strength can be significantly improved by the portion of the insulator body surrounded by the housing body carrying an electrically conductive coating.
  • the electrically conductive coating of the insulator body together with the center electrode forms the capacitor whose dielectric is the insulator body.
  • the known ignition device forms the metallic housing body together with the center electrode, the capacitor, which probably leads to a less uniform electric field and therefore to a lower dielectric strength.
  • the electrically conductive coating may be, for example, a metallic coating.
  • the electrically conductive coating is a ceramic coating. Ceramic coatings have the advantage of a large one Hardness. In a hard coating, the risk of damage when inserting the insulator body in the housing body is much lower. This is an important advantage because damage to the coating is a weak spot that can cause field swell leading to partial discharges.
  • non-oxide ceramics for example borides, in particular diborides, for example titanium or zirconium boride, carbides, in particular titanium carbide or silicon carbide, and nitrides.
  • borides in particular diborides, for example titanium or zirconium boride
  • carbides in particular titanium carbide or silicon carbide
  • nitrides Particular preference is given to nitride-ceramic coatings, since nitrides combine good electrical conductivity with high hardness and high chemical resistance. Good results can be achieved in particular with ceramic materials based on titanium and / or chromium nitride.
  • indium tin oxides in particular indium tin oxides predominantly consisting of indium oxide, such as (In 2 O 3 ) 1-x (SnO 2 ) x where x ⁇ 0.2, in particular x ⁇ 0.1 ,
  • the electrically conductive coating preferably has a thickness of less than 100 ⁇ m, more preferably less than 50 ⁇ m, in particular not more than 20 ⁇ m. Even very thin coatings are sufficient to improve the service life. However, the coating preferably has a thickness of at least 1 ⁇ m.
  • the insulator body of an ignition device according to the invention can be provided, for example by deposition from the gas phase, in particular PVD or CVD, with an electrically conductive coating.
  • the electrical coating preferably consists of a single layer.
  • multilayer coatings for example with a layer based on chromium nitride and a further layer based on titanium chromium nitride.
  • the electrically conductive coating preferably has a sheet resistance of less than 50 ⁇ , particularly preferably less than 20 ⁇ , in particular not more than 10 ⁇ .
  • the general rule is that field overshoot, the flashovers and partial discharges, the better the greater the conductivity of the coating.
  • the electrically conductive layer of the insulator body electrically contacts the metallic housing body.
  • the electrically conductive layer is typically grounded, as is the metallic package body.
  • the insulator body can be glued or soldered, for example, in the housing body.
  • the insulator body is clamped in the housing body. This can be achieved for example by pressing the insulator into the housing body or by a heat shrink connection. Ceramic coatings advantageously have sufficient hardness to allow such a joining process.
  • the electrically conductive coating has a hardness of at least 1500 HV 0.05, more preferably of at least 2000 HV 0.05. These values are based on a Vickers hardness test with a test load of 0.05 kilopond.
  • a coil is arranged in the housing, which forms the circuit for RF excitation of the center electrode together with the capacitor formed by the conductive coating and the center electrode.
  • a circuit is a resonant circuit.
  • the circuit is a series resonant circuit. In principle, however, a parallel resonant circuit can also be used.
  • a further advantageous embodiment of the invention provides that the insulator body protrudes with an uncoated portion of the housing body.
  • a further advantageous development of the invention provides that the insulator body protrudes from the housing body at its end on the combustion chamber side and covers the housing body there. In this way, the insulator body form a stop against which the housing body rests.
  • the joining of insulator body and housing body, for example by pressing, can be facilitated.
  • FIG. 1 shows a high-frequency ignition device for igniting a combustible gas mixture in an internal combustion engine.
  • the in FIG. 1 circled image section A is in FIG. 2 shown in a cutaway view.
  • the RF ignitor has a center electrode 2 terminating in a firing tip 2a, a ceramic insulator body 3 through which the center electrode 2 passes, and a housing 4 supporting at one end a metallic housing body 5 supporting at least a portion of the insulator body 3 surrounds and carries an external thread 5a for screwing into an internal combustion engine.
  • the section of the insulator body 3 surrounded by the housing body 5 carries an electrically conductive coating 6 which bears against the housing body 5 and makes electrical contact with it.
  • the electrically conductive coating 6 and the center electrode 2 form a capacitor whose dielectric is the portion of the insulator body 3 covered by the coating 6.
  • This capacitor is part of a circuit for high-frequency excitation of the center electrode 2.
  • the coil 7 forms together with the capacitor an electrical resonant circuit with which the center electrode 2 can be excited, so that their protruding from the insulator body 3 firing tip 2 a emits high-frequency electromagnetic waves in the combustion chamber of a Motors generate a plasma and thus cause an ignition.
  • the resonant circuit has a resonant frequency of more than one MHz, preferably more than 10 MHz, more preferably more than 100 MHz.
  • the firing tip of the center electrode 2 therefore radiates electromagnetic waves having a frequency of more than one MHz.
  • Particularly suitable is a frequency range of 10 MHz to 10 GHz.
  • the electrically conductive coating 6 is a ceramic coating in the illustrated embodiment. Particularly suitable are in particular nitride ceramic coatings, for example based on titanium nitride.
  • the coating has in the illustrated embodiment has a thickness between 1 .mu.m and 10 .mu.m and a sheet resistance of less than 1 ⁇ .
  • the electrically conductive coating can be deposited from the gas phase, for example by means of PVD (physical vapor deposition) or CVD (chemical vapor depositon).
  • the insulator body 3 is held in the housing body 5 by clamping.
  • the insulator body can be pressed into the housing body 5.
  • Another possibility is, in particular, to heat the housing body 5 and allow it to shrink to shrink on the insulator body 3. With such a heat-shrinkable connection, as well as by a press connection, an advantageously gastight connection between the insulator body 3 and the housing body 5 can be effected.
  • the insulator body 3 protrudes at its combustion chamber end with an uncoated portion of the housing body 5 out.
  • the uncoated portion has an enlarged diameter and covers the housing body 5.
  • the combustion chamber-side end of the housing body 5 is completely covered.
  • the housing body partially covered. An increased distance reduces the risk of shunts.
  • FIG. 3 schematically shows a modified embodiment in which the ceramic insulator body 3 forms a conical-pressing dressing with the metallic housing body 5.
  • the housing body 5 may be made of steel, for example, the insulator body, for example, of aluminum oxide.
EP10014169.6A 2009-12-19 2010-10-30 Dispositif d'allumage HF Withdrawn EP2337173A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910059649 DE102009059649B4 (de) 2009-12-19 2009-12-19 HF-Zündeinrichtung

Publications (2)

Publication Number Publication Date
EP2337173A2 true EP2337173A2 (fr) 2011-06-22
EP2337173A3 EP2337173A3 (fr) 2013-05-22

Family

ID=43608234

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10014169.6A Withdrawn EP2337173A3 (fr) 2009-12-19 2010-10-30 Dispositif d'allumage HF

Country Status (7)

Country Link
US (1) US8863730B2 (fr)
EP (1) EP2337173A3 (fr)
JP (1) JP5677810B2 (fr)
KR (1) KR101694685B1 (fr)
CN (1) CN102122796A (fr)
DE (1) DE102009059649B4 (fr)
RU (1) RU2010151499A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3379665A1 (fr) * 2012-03-23 2018-09-26 Federal-Mogul Ignition Company Dispositif d'allumage à effet couronne à performances électriques améliorées
US10490982B2 (en) 2012-03-23 2019-11-26 Tenneco Inc. Corona ignition device with improved electrical performance
EP2581998B1 (fr) * 2011-10-14 2019-12-18 Delphi Automotive Systems Luxembourg SA Bougie d'allumage pour système d'allumage haute fréquence

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9010294B2 (en) * 2010-04-13 2015-04-21 Federal-Mogul Ignition Company Corona igniter including temperature control features
WO2012091920A1 (fr) 2010-12-14 2012-07-05 Federal-Mogul Ignition Company Igniteur à effet couronne ayant un isolateur conformé
CN103370530B (zh) 2010-12-15 2016-09-14 费德罗-莫格尔点火公司 包括具有改进的绝缘性能的点火线圈的电晕点火器
WO2012092432A1 (fr) 2010-12-29 2012-07-05 Federal-Mogul Ignition Company Élément d'allumage à effet de couronne doté d'une commande d'espacement améliorée
WO2012116004A1 (fr) 2011-02-22 2012-08-30 Federal-Mogul Ignition Company Allumeur à effet corona à efficacité énergétique améliorée
US8749126B2 (en) 2011-06-27 2014-06-10 Federal-Mogul Ignition Company Corona igniter assembly including corona enhancing insulator geometry
DE102012108251B4 (de) * 2011-10-21 2017-12-07 Borgwarner Ludwigsburg Gmbh Korona-Zündeinrichtung
JP5798054B2 (ja) * 2012-02-01 2015-10-21 日本特殊陶業株式会社 スパークプラグ
JP5820313B2 (ja) * 2012-03-07 2015-11-24 日本特殊陶業株式会社 点火プラグ及び点火システム
JP5809585B2 (ja) * 2012-03-07 2015-11-11 日本特殊陶業株式会社 点火システム
US10056737B2 (en) 2012-03-23 2018-08-21 Federal-Mogul Llc Corona ignition device and assembly method
DE102012109762B4 (de) * 2012-10-12 2014-06-05 Borgwarner Beru Systems Gmbh Koronazündeinrichtung mit gasdichtem HF-Steckverbinder
DE102012110657B3 (de) * 2012-11-07 2014-02-06 Borgwarner Beru Systems Gmbh Koronazündeinrichtung
KR20150129036A (ko) * 2013-03-15 2015-11-18 페더럴-모굴 이그니션 컴퍼니 코로나 점화기에 대한 마손 방지 특성
DE202014101756U1 (de) 2014-04-14 2014-04-30 Borgwarner Beru Systems Gmbh Koronazündeinrichtung
DE102014111684B3 (de) * 2014-08-15 2015-10-01 Borgwarner Ludwigsburg Gmbh Koronazündeinrichtung
DE102015120254B4 (de) 2015-11-23 2019-11-28 Borgwarner Ludwigsburg Gmbh Koronazündeinrichtung und Verfahren zu ihrer Herstellung
US10455852B2 (en) * 2016-04-13 2019-10-29 Meng-Hsiu Hsieh Rapid defrosting tray
CN109952687B (zh) * 2016-08-18 2021-10-15 天纳克公司 具有提高的电气性能的电晕点火装置
US10879677B2 (en) * 2018-01-04 2020-12-29 Tenneco Inc. Shaped collet for electrical stress grading in corona ignition systems

Citations (1)

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Publication number Priority date Publication date Assignee Title
EP1515594A2 (fr) 2003-09-12 2005-03-16 Renault s.a.s. Système de génération de plasma

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Publication number Priority date Publication date Assignee Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2581998B1 (fr) * 2011-10-14 2019-12-18 Delphi Automotive Systems Luxembourg SA Bougie d'allumage pour système d'allumage haute fréquence
EP3379665A1 (fr) * 2012-03-23 2018-09-26 Federal-Mogul Ignition Company Dispositif d'allumage à effet couronne à performances électriques améliorées
US10490982B2 (en) 2012-03-23 2019-11-26 Tenneco Inc. Corona ignition device with improved electrical performance
EP2828940B1 (fr) * 2012-03-23 2020-05-06 Federal-Mogul Ignition LLC Dispositif d'allumage à effet couronne à fonctionnement électrique amélioré

Also Published As

Publication number Publication date
KR20110070954A (ko) 2011-06-27
DE102009059649A1 (de) 2011-06-22
JP5677810B2 (ja) 2015-02-25
JP2011129511A (ja) 2011-06-30
EP2337173A3 (fr) 2013-05-22
CN102122796A (zh) 2011-07-13
DE102009059649B4 (de) 2011-11-24
RU2010151499A (ru) 2012-06-27
US20110146640A1 (en) 2011-06-23
KR101694685B1 (ko) 2017-01-23
US8863730B2 (en) 2014-10-21

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