EP1758219A1 - Zündkerze für Verbrennungsmotor - Google Patents

Zündkerze für Verbrennungsmotor Download PDF

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Publication number
EP1758219A1
EP1758219A1 EP06300761A EP06300761A EP1758219A1 EP 1758219 A1 EP1758219 A1 EP 1758219A1 EP 06300761 A EP06300761 A EP 06300761A EP 06300761 A EP06300761 A EP 06300761A EP 1758219 A1 EP1758219 A1 EP 1758219A1
Authority
EP
European Patent Office
Prior art keywords
winding
ring
spark plug
internal combustion
combustion engine
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
Application number
EP06300761A
Other languages
English (en)
French (fr)
Other versions
EP1758219B1 (de
Inventor
Xavier Jaffrezic
André AGNERAY
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 EP1758219A1 publication Critical patent/EP1758219A1/de
Application granted granted Critical
Publication of EP1758219B1 publication Critical patent/EP1758219B1/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

Definitions

  • the invention relates to a plasma generation spark plug, used in particular for igniting internal combustion engines by electric spark between the electrodes of a candle.
  • the publications, 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.
  • the winding has edge effects that deflect the magnetic field lines. These latter pass radially through the turns located at the ends of the winding. The apparent resistance of the turns located at the ends of the winding is increased, which degrades the coefficient of quality of the winding and therefore the properties of the resonator.
  • the invention aims at reducing edge effects so as to optimize the properties of the resonator.
  • the ring is made of ferromagnetic material, for example ferrite.
  • the radial thickness of the ring is at least equal to a quarter of the radius of the contiguous end turn.
  • the median radius of the ring is substantially equal to the median radius of the end turn.
  • FIG. 1 represents a schematic sectional view along the Z axis of a radiofrequency plasma candle according to the state of the art.
  • FIG. 2 represents a schematic sectional view along the Z axis of a radiofrequency plasma candle comprising a ring with electromagnetic properties according to the invention.
  • FIG. 3 represents a sectional view of the inductive part of FIG. 2.
  • a radiofrequency plasma candle 1 of substantially cylindrical general shape with a Z axis mainly comprises a substantially capacitive bottom portion C and an essentially inductive upper part I, parts C and I being of substantially elongate shape, connected in series.
  • the essentially capacitive part C comprises, in particular, a base 2 intended to be connected to the ground and surrounding a central electrode 3, substantially cylindrical, of axis Z, playing the part high voltage electrode.
  • An electrically insulating block, called “insulator” 4 is placed between the base 2 and the central electrode 3, the insulator 4 being configured to guide the sparks between the electrodes 2 and 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 establishment, 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 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 consists 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.
  • the insulator 7 surrounding the coil 5 is of generally cylindrical shape. It can be chosen in different materials such as ceramics.
  • 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.
  • a radiofrequency plasma candle 1 of substantially cylindrical general shape with a Z axis mainly comprises a substantially capacitive bottom portion C and an essentially inductive upper part I, the parts C and I being of substantially elongated shape, connected in series.
  • the essentially capacitive part C is as previously described in FIG. 1.
  • the essentially inductive part I of the spark plug 1 has from inside to outside: a central mandrel 8, a winding 5, a ring 9, an insulator 7 , an outer envelope 6.
  • the central mandrel 8, the coil 5, the insulator 7 and the outer casing 6 are as previously described in FIG.
  • the ring 9 is of cylindrical general shape with circular section.
  • the ring 9 has an axis substantially coincident with that of the winding 5 in this case the Z axis. It surrounds the mandrel 8. It is disposed at one of the axial ends of the winding 5, the last turn 51b and one its radial faces 10 is adjacent to the last turn 51b.
  • the ring 9 is magnetic.
  • the ring 9 may be chosen from ferrite. The skilled person will take any appropriate measure for the electrical insulation is ensured.
  • the thickness E is at least equal to a quarter of the median radius S of the last turn 51b.
  • the median radius R is substantially equal to the median radius S of the last turn 51b so that substantially the same amount of magnetic element is distributed on either side of the last turn 51b.
  • the median radius R is defined as the distance between the axis of the coil Z and the median axis P of the ring 9.
  • the median radius S of the last turn 51b corresponds to the distance between the axis of the coil Z and the center of the last turn. In other term, in axial section, the median axial plane of the ring 9 is aligned with the center of the last turn 51 b.
  • the height H is at least equal to five times the diameter D of the wire constituting the winding 5 in order to ensure a sufficient volume to prevent the magnetic material from being subjected to magnetic saturation.
  • a magnetic ring 9 is unexpected. Indeed, usually a magnetic element is used to modify the magnetic permeability of the core of a coil 5 to increase its own inductance.
  • the invention proposes not to modify the intrinsic inductance of the winding 5 but to modify the trajectory of the magnetic field lines while keeping the value of the inductance so as to reduce the edge effects.
  • the ring 9 decreases the value of the radial magnetic field in the section of the turns.
  • the contiguous positioning of the ring 9 at the last turn 51b makes it possible to globally modify the magnetic field which radially crosses the section of the last turn 51b and turns 51 situated in the vicinity.
  • the eddy current induced by this field is reduced, which facilitates the flow of current through the winding 5, which is in the opposite direction to the eddy current.
  • the excitation frequency impedance of the winding 5 is reduced, which makes it possible to increase the coefficient of quality of the resonator.
  • a ring 9 may also be joined to each of the end turns 51a, 51b.
  • the shape of the coil 5 depends on the mandrel 8 that surrounds it.
  • the mandrel 8 is generally cylindrical in square section
  • the coil 5 is generally tubular in square section.
  • the winding 5 may have a general shape different from that of the mandrel 8.
  • the winding 5 may comprise several windings with contiguous turns 51.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Spark Plugs (AREA)
EP06300761A 2005-08-25 2006-07-06 Zündkerze für Verbrennungsmotor Not-in-force EP1758219B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0552563A FR2890248B1 (fr) 2005-08-25 2005-08-25 Bougie d'allumage a plasma pour un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1758219A1 true EP1758219A1 (de) 2007-02-28
EP1758219B1 EP1758219B1 (de) 2008-02-27

Family

ID=36201379

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06300761A Not-in-force EP1758219B1 (de) 2005-08-25 2006-07-06 Zündkerze für Verbrennungsmotor

Country Status (4)

Country Link
EP (1) EP1758219B1 (de)
AT (1) ATE387737T1 (de)
DE (1) DE602006000590T2 (de)
FR (1) FR2890248B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010043544A1 (en) 2008-10-13 2010-04-22 Delphi Technologies, Inc. Sparkplug with integrated coil
CN103201916A (zh) * 2010-09-10 2013-07-10 雷诺股份公司 用于内燃机的火花塞
FR2995461A1 (fr) * 2012-09-12 2014-03-14 Renault Sa "bougie d'allumage de type a etincelle radiofrequence a refroidissement integre"

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2859569A1 (fr) 2004-01-23 2005-03-11 Alstom T & D Sa Dispositif et procede de protection contre un arc electrique
FR2859830A1 (fr) 2003-09-12 2005-03-18 Renault Sas Bougie de generation de plasma a inductance integree.
FR2859831A1 (fr) 2003-09-12 2005-03-18 Renault Sa Bougie de generation de plasma.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2859830A1 (fr) 2003-09-12 2005-03-18 Renault Sas Bougie de generation de plasma a inductance integree.
FR2859831A1 (fr) 2003-09-12 2005-03-18 Renault Sa Bougie de generation de plasma.
FR2859569A1 (fr) 2004-01-23 2005-03-11 Alstom T & D Sa Dispositif et procede de protection contre un arc electrique

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010043544A1 (en) 2008-10-13 2010-04-22 Delphi Technologies, Inc. Sparkplug with integrated coil
CN103201916A (zh) * 2010-09-10 2013-07-10 雷诺股份公司 用于内燃机的火花塞
CN103201916B (zh) * 2010-09-10 2016-03-02 雷诺股份公司 用于内燃机的火花塞
FR2995461A1 (fr) * 2012-09-12 2014-03-14 Renault Sa "bougie d'allumage de type a etincelle radiofrequence a refroidissement integre"

Also Published As

Publication number Publication date
FR2890248B1 (fr) 2007-09-28
FR2890248A1 (fr) 2007-03-02
DE602006000590D1 (de) 2008-04-10
DE602006000590T2 (de) 2009-03-26
EP1758219B1 (de) 2008-02-27
ATE387737T1 (de) 2008-03-15

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