WO2008017600A1 - Dispositif d'allumage haute fréquence - Google Patents

Dispositif d'allumage haute fréquence Download PDF

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Publication number
WO2008017600A1
WO2008017600A1 PCT/EP2007/057808 EP2007057808W WO2008017600A1 WO 2008017600 A1 WO2008017600 A1 WO 2008017600A1 EP 2007057808 W EP2007057808 W EP 2007057808W WO 2008017600 A1 WO2008017600 A1 WO 2008017600A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
ignition device
primary
ignition
primary electrode
Prior art date
Application number
PCT/EP2007/057808
Other languages
German (de)
English (en)
Inventor
Georg Bachmaier
Robert Baumgartner
Reinhard Freitag
Thomas Hammer
Oliver Hennig
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2008017600A1 publication Critical patent/WO2008017600A1/fr

Links

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

Definitions

  • the present invention relates to a high-frequency ignition device.
  • the present invention relates to an ignition device for a high frequency plasma ignition according to the features of the preamble of claim 1.
  • a known ignition possibility which offers these features, is the high-frequency plasma ignition, as described for example in DE 10 2004 058 925.
  • a resonant circuit or resonator consisting of a coil inductively and a capacitance excited by a high-frequency source resonant, up to the
  • Capacitor-performing electrodes ignites a high-frequency plasma.
  • the design used so far is based on the conventional spark plug, i. it consists of an outer ground electrode connected to the screwed connection and an insulated central rod electrode. The coupling of higher energy at the same boundary conditions leads to a greatly increased electrode wear.
  • the electrode material Due to the high temperature, the electrode material is partially vaporized and partially burned, ie converted in the oxygen-containing atmosphere into volatile oxides. Furthermore, the electrode wear is based on a local overheating of the material, so that it is in the foot of the Plasma flashover to a microscopic, explosive spattering of molten electrode material comes, which can be deposited on adjacent insulator surfaces and thus reduces its insulating properties. Additional chemical interactions between the sprayed liquid electrode material with the material of the insulator ceramic can also lead to the complete destruction of the ceramic at the plasma temperatures very high.
  • a resulting shorter service life compared to conventional ignition systems is disadvantageous for series production in motor vehicles.
  • a disadvantage of this solution is that it is difficult to realize due to the small available space, especially since a small diameter of the spark plug hole is desired.
  • a plasma igniter with a first and second electrode in which the electrodes have an opposite, non-insulated surface to each other, which is large in relation to the distance of the electrodes.
  • a detonated plasma is driven along the electrodes by thermal forces.
  • the field strength between the electrodes advantageously has almost the same size at each location of the electrode surface.
  • the electrode surfaces have a Borda profile in cross section.
  • Electrode material overheating at the point of contact of the plasma flashover is reduced by causing a local displacement of the contact point during the duration of the plasma flashover.
  • the load is spatially distributed over the entire surface of the primary electrode and the
  • the primary electrode and / or secondary electrode is rounded at the transition to the electrode tip.
  • an increase in field strength for example at an edge of an electrode, is avoided, and the point of contact of the plasma flashover does not "hang" on such an edge.
  • the distance between primary electrode and secondary electrode is smaller than corresponds to the equipotential surfaces.
  • an air volume is present in a region at the lower end of the surfaces opposite the electrode tips, so that an ignition region in which the plasma flashover occurs is above the air volume.
  • the primary electrode or the secondary electrode at the lower end of the surfaces of insulating material is arranged opposite.
  • the primary electrode and the secondary electrode are designed to be rotationally symmetrical as a concentrically arranged cylindrical surface.
  • Fig. 1 shows schematically in cross section the region of the electrodes of an ignition device according to the invention.
  • FIG. 1 the region of the electrodes of an ignition device according to the invention is shown schematically in cross section.
  • a formed as a center electrode 1 primary electrode 2 projects with its electrode tip 3 in a combustion chamber, not shown.
  • the transition between electrode tip 3 and a first spark sliding surface 4 is rounded.
  • the first sparking sliding surface 4 is located opposite a corresponding second sparking sliding surface 5 on a secondary electrode 6 concentrically surrounding the primary electrode 2.
  • the surface of the first sparking sliding surface 4 and the second sparking sliding surface 5 each correspond to an equipotential surface of the electric field when a voltage is applied between the primary electrode 2 and a secondary electrode 6.
  • a ceramic insulating material 10 is arranged below an ignition region 7, in which the distance of the first sparking sliding surface 4 and the second sparking sliding surface 5 is smaller than would correspond to the equipotential surfaces.
  • an air volume 8 is arranged, in which the primary electrode 2 is facing only ceramic insulating material 10.
  • Ignition range 7 to a plasma flashover 9 since the field strength is increased by the smaller distance.
  • the air in the air volume 8 through the plasma, as well Corona discharges heated and drives the plasma flashover 9 toward the electrode tip 3.
  • Equipotential surfaces of the first sparking sliding surface 4 and the second sparking sliding surface 5 already reach low forces in order to achieve a migration of the plasma flashover 9, and the plasma flashover is caused by the thermal force of the strongly heated air in the air gap between the primary electrode 2 and the secondary electrode 6 from the spark plug Direction of the ignitable mixture driven. Time sequential images of the plasma flashover 9 are shown for clarity.
  • the load is distributed spatially over the entire surface of the primary electrode 2 and the secondary electrode 6 and takes place for a short time, that also a heating of the
  • Electrode material is harmless until local liquefaction, if the time is too short to cause a material removal by splashing. The point of contact moves on and the locally heated material can solidify again without appreciable losses. The service lives of the spark plug are significantly increased.

Landscapes

  • Ignition Installations For Internal Combustion Engines (AREA)
  • Spark Plugs (AREA)

Abstract

Dans un dispositif d'allumage comprenant une électrode primaire (2) et une électrode secondaire (6), l'électrode primaire (2) et l'électrode secondaire (6) présentent des surfaces (4,5) non isolées tournées l'une vers l'autre qui présentent, l'une par rapport à l'autre, un court espacement par rapport à leur étendue longitudinale jusqu'à une pointe d'électrode respective (3) en direction d'un côté chambre de combustion du dispositif d'allumage. Les surfaces (4,5) de l'électrode primaire (2) et de l'électrode secondaire (6) sont sensiblement respectivement sur une surface équipotentielle du champ électrique lorsque l'on fait passer une tension entre l'électrode primaire (2) et l'électrode secondaire (6).
PCT/EP2007/057808 2006-08-08 2007-07-30 Dispositif d'allumage haute fréquence WO2008017600A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610037039 DE102006037039B4 (de) 2006-08-08 2006-08-08 Hochfrequenz-Zündvorrichtung
DE102006037039.2 2006-08-08

Publications (1)

Publication Number Publication Date
WO2008017600A1 true WO2008017600A1 (fr) 2008-02-14

Family

ID=38754614

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/057808 WO2008017600A1 (fr) 2006-08-08 2007-07-30 Dispositif d'allumage haute fréquence

Country Status (2)

Country Link
DE (1) DE102006037039B4 (fr)
WO (1) WO2008017600A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2908393B1 (fr) 2005-04-19 2023-10-04 Knite, Inc. Procédé et appareil pour faire fonctionner un ensemble pour allumage par étincelle en mouvement à haute pression
DE102010045171B4 (de) * 2010-06-04 2019-05-23 Borgwarner Ludwigsburg Gmbh Zünder zum Zünden eines Brennstoff-Luft-Gemisches in einer Verbrennungskammer, insbesondere in einem Verbrennungsmotor, durch Erzeugen einer Korona-Entladung
EP2737201A1 (fr) 2011-07-26 2014-06-04 Knite, Inc. Allumeur à étincelle circulante

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB118632A (fr) *
FR609338A (fr) * 1925-04-23 1926-08-12 Bougie particulièrement destinée aux moteurs à explosions suralimentés
DE2120250A1 (de) * 1971-04-26 1972-11-02 Beru-Werk Albert Ruprecht, 7140 Ludwigsburg Zündkerze mit Edelmetallelektroden
US4841925A (en) * 1986-12-22 1989-06-27 Combustion Electromagnetics, Inc. Enhanced flame ignition for hydrocarbon fuels
US6882092B1 (en) * 2003-05-20 2005-04-19 Bill Nguyen Jet nozzle spark plug

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5361737A (en) * 1992-09-30 1994-11-08 West Virginia University Radio frequency coaxial cavity resonator as an ignition source and associated method
JPH10189212A (ja) * 1995-11-15 1998-07-21 Ngk Spark Plug Co Ltd 多極スパークプラグ
US5704321A (en) * 1996-05-29 1998-01-06 The Trustees Of Princeton University Traveling spark ignition system
DE10203649A1 (de) * 2002-01-30 2003-08-14 Karlsruhe Forschzent Schaltfunkenstrecke
DE102004058925A1 (de) * 2004-12-07 2006-06-08 Siemens Ag Hochfrequenz-Plasmazündvorrichtung für Verbrennungskraftmaschinen, insbesondere für direkt einspritzende Otto-Motoren

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB118632A (fr) *
FR609338A (fr) * 1925-04-23 1926-08-12 Bougie particulièrement destinée aux moteurs à explosions suralimentés
DE2120250A1 (de) * 1971-04-26 1972-11-02 Beru-Werk Albert Ruprecht, 7140 Ludwigsburg Zündkerze mit Edelmetallelektroden
US4841925A (en) * 1986-12-22 1989-06-27 Combustion Electromagnetics, Inc. Enhanced flame ignition for hydrocarbon fuels
US6882092B1 (en) * 2003-05-20 2005-04-19 Bill Nguyen Jet nozzle spark plug

Also Published As

Publication number Publication date
DE102006037039A1 (de) 2008-02-14
DE102006037039B4 (de) 2010-06-24

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