EP1938430A1 - Spark plug for motor vehicle internal combustion engine - Google Patents
Spark plug for motor vehicle internal combustion engineInfo
- Publication number
- EP1938430A1 EP1938430A1 EP06831211A EP06831211A EP1938430A1 EP 1938430 A1 EP1938430 A1 EP 1938430A1 EP 06831211 A EP06831211 A EP 06831211A EP 06831211 A EP06831211 A EP 06831211A EP 1938430 A1 EP1938430 A1 EP 1938430A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spark plug
- groove
- central electrode
- combustion engine
- internal combustion
- 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.)
- Granted
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
- H01T13/46—Sparking plugs having two or more spark gaps
-
- 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
- H01T13/46—Sparking plugs having two or more spark gaps
- H01T13/467—Sparking plugs having two or more spark gaps in parallel connection
-
- 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 invention relates to a spark plug for the internal combustion engine of a motor vehicle, of substantially elongated overall shape, comprising:
- an electrically insulating block called an insulator interposed between the central electrode and the base, of an annular shape and having a ring-shaped coating.
- Plasma generation spark plugs are high-frequency, multi-spark ignition systems capable of providing spark-ignition engines with the best ignition conditions, while reducing pollutant emissions, especially in lean mixtures. By cons, they are subject to fouling, especially cold.
- the invention aims to adjust the thermal index of a multi-spark plug so that it behaves like a very hot candle when the engine is still cold and behaves like a warm candle when the engine is hot.
- the invention aims to increase the skin temperature of the insulation while maintaining its electrically insulating properties.
- the invention proposes a candle of the type mentioned above, characterized in that the insulation comprises an annular groove.
- the groove is located at the shoulder.
- the groove has a rectangular section.
- the groove has a triangular section.
- Figure 1 shows a half-sectional view of a multi-spark spark plug known in the state of the art.
- FIG. 2 represents a half-sectional view of a multi-spark plug according to a first embodiment of the invention.
- FIG. 3 represents a half-sectional view of a multi-spark plug according to a second embodiment of the invention. Identical or similar elements are designated by the same reference numerals.
- a multi-spark spark plug 1 comprises two coaxial plasma generation electrodes.
- An external electrode called base 2 is intended to be connected to ground. It surrounds an internal electrode called central electrode 3, substantially cylindrical, axis of symmetry D, acting as a high voltage electrode.
- the materials of the electrodes 2, 3 are chosen from a conductive material such as a nickel alloy.
- 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 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 in Figure 1: a thread).
- the insulation material can be chosen ceramic.
- the insulator 4 has an annular shoulder concealing the entire outer circular surface 6 of the base 2.
- the shoulder 5 increases the distance, through the gas mixture, between the central electrode 3 and the base, to avoid the arc creation between the central electrode 3 and the base 2.
- the shoulder 5 has an annular groove 8.
- the annular groove 8 has a rectangular section.
- the annular groove 8 has a triangular section.
- This groove 8 is dimensioned in such a way that the groove - AT -
- the groove 8 has two parameters: its height h and its depth p.
- the height h makes it possible to add a source of heat inside the insulator 4.
- the height h varies according to the collection surface of the heat, which makes it possible to modify the distribution of the heat flows entering the insulation. .
- the depth p of the groove 8 allows us to adjust the thermal resistance of the system. Indeed, changes in longitudinal thermal conductivity (along the axis D) make it possible to vary the temperature gradients in the axial direction and therefore the temperature distributions.
- the shape of the groove 8 is illustrated in Figures 2 and 3 but the invention is not limiting, other forms may be chosen so as to increase the skin temperature of the insulation.
- the groove 8 creates a constriction in the insulator 4 and thus reduces its longitudinal thermal conductivity. In addition, the groove 8 increases the apparent surface of the insulator 4 for a smaller volume. This surface is entirely exposed to the flame produced by the candle, which leads to a greater thermal flux from the flame to the insulation 4 and therefore a greater heating of the insulation 4. The groove 8 does not prevent the deposit of soot but it allows to increase the temperature of the insulator and cleaning by pyrolysis of soot.
Landscapes
- Spark Plugs (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Fats And Perfumes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0553149A FR2892240B1 (en) | 2005-10-18 | 2005-10-18 | IGNITION CANDLES FOR THE INTERNAL COMBUSTION ENGINE OF A MOTOR VEHICLE |
PCT/FR2006/050923 WO2007045776A1 (en) | 2005-10-18 | 2006-09-21 | Spark plug for motor vehicle internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1938430A1 true EP1938430A1 (en) | 2008-07-02 |
EP1938430B1 EP1938430B1 (en) | 2010-04-21 |
Family
ID=36587264
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06831211A Not-in-force EP1938430B1 (en) | 2005-10-18 | 2006-09-21 | Spark plug for motor vehicle internal combustion engine |
Country Status (12)
Country | Link |
---|---|
US (1) | US8040029B2 (en) |
EP (1) | EP1938430B1 (en) |
JP (1) | JP4970458B2 (en) |
KR (1) | KR101314761B1 (en) |
CN (1) | CN101292403B (en) |
AT (1) | ATE465536T1 (en) |
BR (1) | BRPI0617514A2 (en) |
DE (1) | DE602006013857D1 (en) |
ES (1) | ES2344522T3 (en) |
FR (1) | FR2892240B1 (en) |
RU (1) | RU2402127C2 (en) |
WO (1) | WO2007045776A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009059649B4 (en) * | 2009-12-19 | 2011-11-24 | Borgwarner Beru Systems Gmbh | HF ignition device |
FR2965984B1 (en) * | 2010-10-12 | 2012-10-12 | Renault Sa | PREVENTION AGAINST A SHORT CIRCUIT OF THE RF CANDLE |
WO2012091920A1 (en) * | 2010-12-14 | 2012-07-05 | Federal-Mogul Ignition Company | Corona igniter having shaped insulator |
US10056738B2 (en) | 2012-03-23 | 2018-08-21 | Federal-Mogul Llc | Corona ignition device with improved electrical performance |
US9088136B2 (en) * | 2012-03-23 | 2015-07-21 | Federal-Mogul Ignition Company | Corona ignition device with improved electrical performance |
US10056737B2 (en) | 2012-03-23 | 2018-08-21 | Federal-Mogul Llc | Corona ignition device and assembly method |
JP6524136B2 (en) | 2017-03-31 | 2019-06-05 | 日本特殊陶業株式会社 | Spark plug |
EP3875967A1 (en) * | 2020-03-04 | 2021-09-08 | Sécheron SA | High-voltage electrical device |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6132979A (en) * | 1984-07-25 | 1986-02-15 | 株式会社デンソー | Small-sized spark plug |
FR2726864B1 (en) * | 1994-11-15 | 1996-12-27 | Sagem Allumage | IGNITION DEVICE FOR INTERNAL COMBUSTION ENGINE |
JP3140006B2 (en) * | 1998-06-11 | 2001-03-05 | 日本特殊陶業株式会社 | Spark plug |
JP4431271B2 (en) * | 1999-12-13 | 2010-03-10 | 日本特殊陶業株式会社 | Spark plug |
DE10015916A1 (en) * | 2000-03-30 | 2001-10-04 | Bosch Gmbh Robert | Spark plug for internal combustion engine, includes shaded zone on insulator foot in region of intermediate space, to provide shaded zone in radial direction |
JP3887010B2 (en) * | 2002-10-25 | 2007-02-28 | 日本特殊陶業株式会社 | Spark plug for internal combustion engine |
DE10329269B4 (en) * | 2003-06-30 | 2005-12-29 | Robert Bosch Gmbh | Spark plug with at least two center electrodes |
FR2859830B1 (en) | 2003-09-12 | 2014-02-21 | Renault Sas | PLASMA GENERATION CANDLE WITH INTEGRATED INDUCTANCE. |
FR2859831B1 (en) * | 2003-09-12 | 2009-01-16 | Renault Sa | GENERATION CANDLE OF PLASMA. |
FR2859869B1 (en) | 2003-09-12 | 2006-01-20 | Renault Sa | PLASMA GENERATION SYSTEM. |
FR2878086B1 (en) * | 2004-11-16 | 2007-03-09 | Renault Sas | PLASMA RADIOFREQUENCY CANDLE |
FR2887696B1 (en) * | 2005-06-23 | 2007-08-24 | Renault Sas | IGNITION CANDLE FOR INTERNAL COMBUSTION ENGINE |
-
2005
- 2005-10-18 FR FR0553149A patent/FR2892240B1/en not_active Expired - Fee Related
-
2006
- 2006-09-21 DE DE602006013857T patent/DE602006013857D1/en active Active
- 2006-09-21 BR BRPI0617514-7A patent/BRPI0617514A2/en not_active Application Discontinuation
- 2006-09-21 KR KR1020087009236A patent/KR101314761B1/en active IP Right Grant
- 2006-09-21 RU RU2008119474/07A patent/RU2402127C2/en not_active IP Right Cessation
- 2006-09-21 CN CN2006800388044A patent/CN101292403B/en not_active Expired - Fee Related
- 2006-09-21 WO PCT/FR2006/050923 patent/WO2007045776A1/en active Application Filing
- 2006-09-21 JP JP2008536090A patent/JP4970458B2/en not_active Expired - Fee Related
- 2006-09-21 ES ES06831211T patent/ES2344522T3/en active Active
- 2006-09-21 AT AT06831211T patent/ATE465536T1/en not_active IP Right Cessation
- 2006-09-21 EP EP06831211A patent/EP1938430B1/en not_active Not-in-force
- 2006-09-21 US US12/090,722 patent/US8040029B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2007045776A1 * |
Also Published As
Publication number | Publication date |
---|---|
ES2344522T3 (en) | 2010-08-30 |
EP1938430B1 (en) | 2010-04-21 |
CN101292403B (en) | 2012-06-20 |
WO2007045776A1 (en) | 2007-04-26 |
BRPI0617514A2 (en) | 2011-07-26 |
KR20080063316A (en) | 2008-07-03 |
FR2892240A1 (en) | 2007-04-20 |
ATE465536T1 (en) | 2010-05-15 |
JP4970458B2 (en) | 2012-07-04 |
FR2892240B1 (en) | 2010-10-22 |
KR101314761B1 (en) | 2013-10-08 |
DE602006013857D1 (en) | 2010-06-02 |
CN101292403A (en) | 2008-10-22 |
US8040029B2 (en) | 2011-10-18 |
JP2009512172A (en) | 2009-03-19 |
RU2008119474A (en) | 2009-11-27 |
US20080284303A1 (en) | 2008-11-20 |
RU2402127C2 (en) | 2010-10-20 |
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