EP1815570B1 - Bougie a plasma radiofrequence - Google Patents
Bougie a plasma radiofrequence Download PDFInfo
- Publication number
- EP1815570B1 EP1815570B1 EP05815563A EP05815563A EP1815570B1 EP 1815570 B1 EP1815570 B1 EP 1815570B1 EP 05815563 A EP05815563 A EP 05815563A EP 05815563 A EP05815563 A EP 05815563A EP 1815570 B1 EP1815570 B1 EP 1815570B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spark plug
- shell
- electrode
- annular
- insulating component
- 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
Links
Images
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
- H01T13/52—Sparking plugs characterised by a discharge along a surface
Definitions
- the present invention relates, in general, radiofrequency plasma candles.
- Such a candle is known from DE-C-19723784 .
- the ignition of gasoline internal combustion engines consisting of initiating the combustion of an air-fuel mixture in a combustion chamber of said engine, is relatively well controlled in current engines.
- Ignition of a fuel-poor mixture is, however, difficult to control. For this, and in order to increase the probability of successful ignition, it is necessary to have more fuel-rich mixtures around the candle at the moment the spark occurs.
- Such candles are described in particular in patent applications FR97-14799 , FR99-09473 and FR00-13821 . Such candles generate sparks of large sizes from reduced potential differences.
- the surface spark plugs have a dielectric (insulating part) separating the electrodes (one electrode being the annular base and the other electrode being the central electrode) in the zone where the distance separating them is the lowest; the sparks formed between the electrodes are thus guided on the surface of the dielectric.
- These candles amplify the inter-electrode field on the surface of the dielectric.
- the elementary capacities are progressively formed by the dielectric and an underlying electrode. Candles generate a spark propagating along the surface of the insulation in areas where the electric field in the air / gas mixture is strongest.
- the present invention therefore aims to provide a spark plug which when assembled in a combustion chamber increases the probability of ignition of the mixture surrounding the candle.
- the spark plug of the invention which is also in accordance with the generic definition given in the preamble defined above, is essentially characterized in that the insulating piece has an annular shoulder concealing the entire circular end surface of the base relative to the uncoated portion of the electrode.
- the spark plug according to the invention when the spark plug according to the invention is assembled in a vehicle combustion chamber, with the part of the central electrode not covered by the insulator, arranged inside the chamber, and with the base assembled in the thickness of the chamber wall, no electric arc can occur between the base and the central electrode. Indeed the access to the base from the uncovered portion of the central electrode is prevented by the presence of the insulator.
- the spark plug according to the invention when subjected to a radio frequency excitation, ie an alternating voltage between the base and the central electrode (for example said alternating voltage being greater than 5kV and having a frequency higher than 1 MHz) forms a branched plasma near the central electrode and not an electric arc. It is understood that this given voltage and frequency is suitable for creating a plasma in a gaseous mixture having a molar density greater than 5 * 10 -2 mol / L.
- plasma or branched plasma refers to the simultaneous generation of at least several lines or ionization paths in a given gas volume, their branches being moreover omnidirectional.
- volume plasma involves heating up the entire volume in which it is to be generated
- the branched plasma only requires the heating in the path of the sparks formed.
- the energy required for a branched plasma is significantly less than that required by a volume plasma.
- the branched plasma generated by the candle according to the invention is generated at a distance from the insulating part, towards the walls of the chamber which are opposite the central electrode, which makes it possible to reduce the probability of generation of an arc with the base and allows correlatively reduce the wear of the electrodes.
- the plasma has the advantage of having a large number of ionization paths or sparks in a large volume of gas located around the central electrode which increases the probability of ignition of the mixture containing oxidant.
- the formation of a spark is initiated by the tearing out of the middle (gas mixture) of a few electrons subjected to a large electric field.
- electrons of an electrode are accelerated by the electrostatic forces generated between the electrodes and collide with the gaseous mixture containing air.
- the portion of the electrode that experiences the largest electrostatic field (usually an angle of one electrode or tip near the other electrode) is the starting point of the first avalanche.
- the molecules of the air are heated and release an electron and a photon ionizing in their turn other molecules of air.
- a chain reaction ionizes the air when applying a large voltage between electrodes separated by an insulator.
- the ionized air around the central electrode has a potential close to this central electrode and behaves as an extension of it.
- the electric field is amplified upstream of the front and promotes the creation of new avalanches.
- the phenomenon tends to self-maintain to create around the central electrode a conductive ionized gaseous mass in the direction of the walls of the chamber.
- the candle of the invention is put under AC voltage which makes it possible to vary the potential existing between the central electrode and the base / chamber, this potential being reversible.
- the electrons are more and more accelerated in opposite directions.
- a polarization wave thus propagates oscillatoryly at the frequency of the excitation, recovering at each period the expenses deposited in the previous period.
- Each alternation then produces a propagation of the wave greater than the preceding one; it is thus possible with the candle of the invention thus fed to obtain relatively large spark amplitudes with voltages between electrode and relatively large cap.
- the radiofrequency excitation of such a candle makes it possible moreover by avoiding the arcs to suppress the breakdown voltage variations between successive cycles.
- the extreme circular surface of the base to bear against a complementary bearing surface of the shoulder of the insulating part.
- This feature makes it possible to eliminate the space between the insulating part and the base, so the heat associated with the presence of a flame triggered by the plasma can be dissipated to the base which prevents overheating of the ceramic.
- the insulating part has a minimum thickness located inside said base, and the shoulder of the insulating part has a shoulder thickness greater than or equal to half of said minimum thickness.
- This feature prevents the junction between the uncovered portion of the central electrode and therefore the air / ceramic / central electrode junction is too close to the base. If this part not covered with the electrode or more precisely this junction was too close to the base it could constitute a surface spark emission zone.
- the base, the electrically insulating part, and the electrode central are parts of revolution having as axis of common symmetry the main axis D.
- the relative positioning accuracy of the constituents of the candle with respect to a common axis of symmetry makes it possible to center the branched plasma around this axis D and the central electrode, which facilitates the location of the zone of the combustion chamber in which sparks occur.
- the annular base is in the form of a cylindrical tube comprising at the first end of the base an internal chamfer coming into contact with the extreme circular surface, this internal chamfer being in contact with a complementary chamfer formed on a portion of the insulating part.
- This embodiment also makes it possible to increase the contact surface between the insulating part and the base, which facilitates the transfer of heat from the insulating part to the base and makes it possible to avoid overheating of this insulating part.
- the internal chamfer has a cross section, in a plane parallel to the main axis D, of rounded shape.
- the annular shoulder comprises an end remote from the annular base at the outer periphery of which is formed a rounded peripheral chamfer, coaxial with respect to the main axis D.
- This peripheral chamfer reduces or eliminates the presence of sharp angle, at the outer periphery of the annular piece, at the end of the annular shoulder.
- the candle 1 of the figure 1 is a candle developed by the Applicant for use as a plasma generation candle. This candle is the subject of patent applications not yet published at the filing date of this application.
- This candle comprises a central cylindrical electrode 7 having an axis of symmetry D, a portion of which, said internal portion, is disposed inside and at a distance an annular base 3 which in the form of a cylindrical tube of axis D.
- An insulating piece of annular shape is also arranged partly inside the annular base, around the central electrode, so as to separate the base of the central electrode 7.
- the insulating part, the central electrode and the base 3 are parts of revolution oriented along the axis D.
- the central electrode 7 has an uncoated portion 16 that is not surrounded by the electrically insulating piece 10 and not surrounded by the base 3, this uncovered portion 16 being disposed inside the combustion chamber 2 of the engine.
- the base 3 has an outer circular surface in the form of a flat disk perforated at its center and having the axis of symmetry axis D and being arranged perpendicular to this axis D.
- the base 3 has a connection with the wall of the chamber 2 which is usually a thread of the base in a hole made through the wall.
- the base of the candle thus assembled with the wall of the chamber 2 is at iso electric potential with this wall, that is to say at an electric potential of mass.
- the central electrode When the central electrode is supplied with alternating voltage centered around the ground potential, this voltage being of a frequency of between 1 and 10 MHz, the electrons located near the tip 17 of the central electrode move either from the electrode to the walls of the chamber through the gaseous mixture surrounding the chamber, or the gas mixture to the electrode. In both cases, the electrical alternation is such that an electron does not have time to go from the central electrode to the wall of the chamber.
- the air can thus be ionized without there being a real electric discharge between the two electrical terminals constituted by the central electrode 7 and the wall of the chamber 2. This ionization creates a plasma located around the tip 17 of the central electrode which concentrates the electric charges in movement around a small volume of exchange.
- candles of the types presented to FIGS. 2A, 2B, 2C have been developed.
- the candles of these figures have all the characteristics described for the candle with reference to the figure 1 , but also have a shoulder 11 formed on the insulating part 10 and obscuring the outer circular surface 6 of the base 3. This shoulder 11 increases the distance, through the gaseous mixture, between the electrode and the base, thus allowing avoid the creation of arcs between the central electrode 17 and the base 3.
- the electrodes of FIGS. 2A, 2B and 2C once arranged with the tip to inside the chamber 2 and supplied with alternating current by an alternating high voltage generator, create a plasma at their points 17.
- the minimum thickness "e” of the insulating part is located inside the base 3 and its maximum thickness "E" is at the shoulder 11.
- the shoulder of the insulating part 10 of the Figure 2A is a shoulder having in longitudinal section right angles which can create concentrations of loads and mechanical stresses.
- the candles of Figures 2B and 2C have at the first end 4 of base 3, an inner bevel 13.
- the insulating part 10 has a complementary chamfer 14 coming into contact with the internal chamfer 13. This large contact surface makes it possible to evacuate the heat from the insulating part towards the base, which prolongs the average life of the spark plug.
- the candle according to the invention of the Figure 2C has a rounded peripheral chamfer 15 formed on the annular shoulder 11 at the location of the shoulder which is the furthest axially away from the base 3.
- This shoulder makes it possible to avoid a right angle at the shoulder, on the path passing through the gaseous mixture, between the tip 17 and the annular base 3. This rounding reduces the risk of creating an arc.
- the first and second conductive materials which are the respective materials of the central electrode and the base 3 are, according to a particular embodiment of the invention, identical to each other. These materials are metallic materials such as copper alloys.
- the end of the central electrode 7 may consist of a copper core surrounded by a nickel sheath.
- the insulation material is preferably a ceramic having a breakdown voltage greater than 20 Kv / mm.
Landscapes
- Spark Plugs (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Percussion Or Vibration Massage (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Plasma Technology (AREA)
- Coating By Spraying Or Casting (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL05815563T PL1815570T3 (pl) | 2004-11-16 | 2005-10-27 | Świece plazmowe działające z częstotliwością radioelektryczną |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0412153A FR2878086B1 (fr) | 2004-11-16 | 2004-11-16 | Bougie a plasma radiofrequence |
PCT/FR2005/050909 WO2006054009A1 (fr) | 2004-11-16 | 2005-10-27 | Bougie a plasma radiofrequence |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1815570A1 EP1815570A1 (fr) | 2007-08-08 |
EP1815570B1 true EP1815570B1 (fr) | 2010-03-31 |
Family
ID=34951956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05815563A Not-in-force EP1815570B1 (fr) | 2004-11-16 | 2005-10-27 | Bougie a plasma radiofrequence |
Country Status (12)
Country | Link |
---|---|
US (1) | US7741761B2 (pl) |
EP (1) | EP1815570B1 (pl) |
JP (1) | JP5062629B2 (pl) |
KR (1) | KR101110436B1 (pl) |
CN (1) | CN101057379B (pl) |
AT (1) | ATE463062T1 (pl) |
DE (1) | DE602005020345D1 (pl) |
ES (1) | ES2343362T3 (pl) |
FR (1) | FR2878086B1 (pl) |
PL (1) | PL1815570T3 (pl) |
RU (1) | RU2352041C1 (pl) |
WO (1) | WO2006054009A1 (pl) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2892240B1 (fr) * | 2005-10-18 | 2010-10-22 | Renault Sas | Bougies d'allumage pour le moteur a combustion interne d'un vehicule automobile |
DE102006037037A1 (de) * | 2006-08-08 | 2008-02-14 | Siemens Ag | Zündvorrichtung für Hochfrequenzplasmazündung |
US20090025669A1 (en) | 2007-07-25 | 2009-01-29 | Gerald Filipek | Heat source supplied glow plug/plasma torch and optional spark plasma torch for accomplishing more efficient piston combustion |
FR2932229B1 (fr) * | 2008-06-05 | 2011-06-24 | Renault Sas | Pilotage de l'alimentation electrique d'une bougie d'allumage d'un moteur a combustion interne |
FR2943739B1 (fr) * | 2009-03-24 | 2015-09-04 | Renault Sas | Procede d'allumage d'un melange de comburant pour moteur thermique |
CN101520001B (zh) * | 2009-03-27 | 2012-10-17 | 昆明理工大学 | 高压电等离子陶瓷内燃机 |
DE102009059649B4 (de) * | 2009-12-19 | 2011-11-24 | Borgwarner Beru Systems Gmbh | HF-Zündeinrichtung |
JP5413186B2 (ja) * | 2009-12-25 | 2014-02-12 | 株式会社デンソー | 高周波プラズマ点火装置 |
FR2959071B1 (fr) | 2010-04-16 | 2012-07-27 | Renault Sa | Bougie d'allumage equipee de moyens de prevention des courts-circuits |
US8217560B2 (en) | 2010-09-04 | 2012-07-10 | Borgwarner Beru Systems Gmbh | Corona ignition device and method for its manufacture |
FR2965984B1 (fr) | 2010-10-12 | 2012-10-12 | Renault Sa | Prevention contre un court-circuit de la bougie rf |
WO2012091920A1 (en) | 2010-12-14 | 2012-07-05 | Federal-Mogul Ignition Company | Corona igniter having shaped insulator |
KR101892627B1 (ko) | 2010-12-14 | 2018-08-27 | 페더럴-모굴 이그니션 컴퍼니 | 비대칭 점화 팁을 구비한 코로나 점화장치 |
JP6068360B2 (ja) | 2010-12-15 | 2017-01-25 | フェデラル−モーグル・イグニション・カンパニーFederal−Mogul Ignition Company | 点火コイルを含み、絶縁が改良されたコロナ点火装置 |
EP2659557B2 (en) | 2010-12-29 | 2019-01-16 | Federal-Mogul Ignition Company | Corona igniter having improved gap control |
CN103392066B (zh) | 2011-02-22 | 2016-06-22 | 费德罗-莫格尔点火公司 | 具有改进能效的电晕点火器 |
US8749126B2 (en) | 2011-06-27 | 2014-06-10 | Federal-Mogul Ignition Company | Corona igniter assembly including corona enhancing insulator geometry |
US9028689B1 (en) | 2011-10-04 | 2015-05-12 | Global Water Holdings, Llc | Electric arc for aqueous fluid treatment |
US9531167B2 (en) | 2014-06-02 | 2016-12-27 | Nxp Usa, Inc. | Device and method for connecting an RF generator to a coaxial conductor |
US9518555B2 (en) * | 2014-12-04 | 2016-12-13 | Freescale Semiconductor, Inc. | Radiation devices |
DE102015120254B4 (de) * | 2015-11-23 | 2019-11-28 | Borgwarner Ludwigsburg Gmbh | Koronazündeinrichtung und Verfahren zu ihrer Herstellung |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4142121A (en) * | 1975-09-08 | 1979-02-27 | Smiths Industries Limited | Electrical igniters |
JPS57186066A (en) * | 1981-05-13 | 1982-11-16 | Hirose Seisakusho:Kk | Discharge ignition method and discharge spark plug of internal combustion engine |
US4841925A (en) * | 1986-12-22 | 1989-06-27 | Combustion Electromagnetics, Inc. | Enhanced flame ignition for hydrocarbon fuels |
RU2099584C1 (ru) * | 1993-02-03 | 1997-12-20 | Козлов Николай Степанович | Способ н.с.козлова воспламенения и сжигания горючей смеси двигателя внутреннего сгорания и устройство для его осуществления |
DE19723784C1 (de) * | 1997-06-06 | 1998-08-20 | Daimler Benz Ag | Schaltungsanordnung für die Zündung einer Brennkraftmaschine |
FR2771558B1 (fr) * | 1997-11-25 | 2004-07-02 | Renault | Bougie d'allumage a effet de surface |
JPH11317277A (ja) * | 1998-04-30 | 1999-11-16 | Masahide Ichikawa | プラズマ発生用プラグ及びこのプラグを備えた内燃機関 |
FR2796767B1 (fr) * | 1999-07-21 | 2001-08-31 | Renault | Bougie a effet de surface |
FR2816119B1 (fr) * | 2000-10-27 | 2003-02-21 | Renault | Bougie a effet de surface a etincelle radiale |
JP4082218B2 (ja) * | 2003-01-08 | 2008-04-30 | トヨタ紡織株式会社 | 自動車用内装材 |
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. |
FR2859831B1 (fr) | 2003-09-12 | 2009-01-16 | Renault Sa | Bougie de generation de plasma. |
-
2004
- 2004-11-16 FR FR0412153A patent/FR2878086B1/fr not_active Expired - Fee Related
-
2005
- 2005-10-27 EP EP05815563A patent/EP1815570B1/fr not_active Not-in-force
- 2005-10-27 WO PCT/FR2005/050909 patent/WO2006054009A1/fr active Application Filing
- 2005-10-27 AT AT05815563T patent/ATE463062T1/de not_active IP Right Cessation
- 2005-10-27 US US11/719,403 patent/US7741761B2/en not_active Expired - Fee Related
- 2005-10-27 RU RU2007122515/06A patent/RU2352041C1/ru not_active IP Right Cessation
- 2005-10-27 DE DE602005020345T patent/DE602005020345D1/de active Active
- 2005-10-27 ES ES05815563T patent/ES2343362T3/es active Active
- 2005-10-27 JP JP2007540687A patent/JP5062629B2/ja not_active Expired - Fee Related
- 2005-10-27 CN CN2005800391080A patent/CN101057379B/zh not_active Expired - Fee Related
- 2005-10-27 KR KR1020077011716A patent/KR101110436B1/ko not_active IP Right Cessation
- 2005-10-27 PL PL05815563T patent/PL1815570T3/pl unknown
Also Published As
Publication number | Publication date |
---|---|
WO2006054009A1 (fr) | 2006-05-26 |
ATE463062T1 (de) | 2010-04-15 |
CN101057379B (zh) | 2012-04-25 |
KR101110436B1 (ko) | 2012-02-15 |
ES2343362T3 (es) | 2010-07-29 |
RU2352041C1 (ru) | 2009-04-10 |
FR2878086B1 (fr) | 2007-03-09 |
KR20070085431A (ko) | 2007-08-27 |
FR2878086A1 (fr) | 2006-05-19 |
US7741761B2 (en) | 2010-06-22 |
JP5062629B2 (ja) | 2012-10-31 |
US20090146542A1 (en) | 2009-06-11 |
RU2007122515A (ru) | 2008-12-27 |
CN101057379A (zh) | 2007-10-17 |
PL1815570T3 (pl) | 2010-08-31 |
JP2008521164A (ja) | 2008-06-19 |
EP1815570A1 (fr) | 2007-08-08 |
DE602005020345D1 (de) | 2010-05-12 |
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