EP0231024B1 - Unité d'amplification d'étincelle pour un dispositif d'allumage - Google Patents

Unité d'amplification d'étincelle pour un dispositif d'allumage Download PDF

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Publication number
EP0231024B1
EP0231024B1 EP87101169A EP87101169A EP0231024B1 EP 0231024 B1 EP0231024 B1 EP 0231024B1 EP 87101169 A EP87101169 A EP 87101169A EP 87101169 A EP87101169 A EP 87101169A EP 0231024 B1 EP0231024 B1 EP 0231024B1
Authority
EP
European Patent Office
Prior art keywords
ignition
amplification unit
unit according
spark
spark plug
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.)
Expired - Lifetime
Application number
EP87101169A
Other languages
German (de)
English (en)
Other versions
EP0231024A2 (fr
EP0231024A3 (en
Inventor
Arnold Mayring
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.)
Isotec AG
Original Assignee
Isotec AG
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 Isotec AG filed Critical Isotec AG
Publication of EP0231024A2 publication Critical patent/EP0231024A2/fr
Publication of EP0231024A3 publication Critical patent/EP0231024A3/de
Application granted granted Critical
Publication of EP0231024B1 publication Critical patent/EP0231024B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P9/00—Electric spark ignition control, not otherwise provided for
    • F02P9/002—Control of spark intensity, intensifying, lengthening, suppression

Definitions

  • the invention relates to an ignition amplifier unit according to the preamble of claim 1.
  • Such an ignition amplifier unit in the form of a spark plug connector is already known (e.g. from DE-A1-2.363.804), in which the capacitor is parallel to the spark gap of the spark plug without any resistors being interposed.
  • the spark plug spark is changed so that the ignitability of the fuel / air mixture increases and the specific consumption decreases.
  • the disadvantage is that the sparking is irregular at higher speeds and with a larger electrode spacing.
  • the invention has for its object to provide an ignition amplifier unit of the type mentioned, which leads to improved and uniform spark formation even at higher speeds and with extreme stress from high-voltage ignition systems.
  • the distance between the electrodes of the spark gap is preferably 0.05 to 0.2 mm. As a result, the most favorable spark formation at the spark plug is achieved over a wide speed range.
  • the inventive design of the spark plug connector can be seen in the fact that the sheath has at least one area of its outer surface with at least one Isolating film having cutout is covered by the thickness of the desired electrode spacing of the spark gap and that the cutout is completely covered by a metal part to be connected to ground.
  • the metal part preferably forms a metal foil.
  • the insulating film and the metal film completely surround the circumference of the casing. This ensures that no interference radiation can emanate from the spark plug connector.
  • the inner foil and the metal foil are held on the insulating sleeve by a shrink tube.
  • FIG. 1 The circuit diagram of an ignition amplifier unit shown in FIG. 1 shows the spark gap 1 of a spark plug, which is connected via a resistor 2 and an ignition cable 3 in the usual way to a distributor (not shown) of an ignition system.
  • Parallel to the spark gap 1 is a capacitor 4 with a capacitance between 5 and 100 pF, which is connected in series with a spark gap 5, one electrode of which is connected to ground.
  • Fig. 2 shows an axial section of a spark plug connector with the features of the invention.
  • the spark plug connector comprises a rod-shaped inner conductor 6, which is designed as a sleeve and contains the resistor 2 inside.
  • One end of the resistor 2 is connected to the rod-shaped inner conductor 6 and has a cap 7, which is designed so that it fits over the connection end of the center electrode of a spark plug (not shown).
  • the other end of the resistor 2 is provided with a threaded mandrel 8 which is screwed into the end of the ignition cable 3.
  • the rod-shaped inner conductor 6 and the parts attached to it are completely surrounded by an insulating sleeve 9, which tapers on the side of the ignition cable 3, so that the ignition cable 3 just fits through.
  • the other end of the insulating sleeve 9 is U-shaped in cross section.
  • a conductive casing 10 for example a metal foil, is applied to the outer lateral surface of the insulating sleeve 9.
  • An insulating film 11 is wound over this sheathing and has one or more cutouts 12 in the form of round holes.
  • the insulating film 11 is in turn from one Surround metal foil 13, which is so large that it completely surrounds the conductive casing 10 in order to avoid interference radiation from the spark plug connector.
  • the metal foil 13 is connected to a helical spring 14 which serves to establish the ground connection of the metal foil 13 with an engine block into which the spark plug is screwed.
  • the outer shell of the spark plug connector is formed by a shrink tube 15, which holds the conductive sheath 10, the insulating film 11, the metal film 13 and one end of the coil spring 14 tightly together.
  • the compressive force caused by the shrink tube causes the conductive sheathing 10 and the metal foil 13 to have a spacing from one another which practically corresponds to the thickness of the insulating foil 11, so that these two parts, which at the same time form the electrodes of the spark gap 5, are invariable Distance from each other.
  • the spark plug connector shown in FIG. 3 differs from the embodiment according to FIG. 2 essentially in that instead of the insulating film 11 a plastic coating 21 is used, which is applied directly to the conductive sheath 10, leaving an annular cutout 22 of about 1 mm width, which serves as a spark gap. The whole is surrounded by a metal jacket 23 which rests on the plastic coating and has an end region of enlarged diameter which fits over a spark plug and is held thereon by means of a spring lock 24. The end of the ignition booster unit opposite the end region on the spark plug side is covered with a rubber cap 25, through which an ignition cable can be passed.
  • a shrink tube which is optionally provided with an internal adhesive coating, can be used as the plastic coating.
  • the spark gap is grounded on one side and both electrodes of the capacitor have floating potential.
  • the capacitor can also be connected to ground on one side and both electrodes of the spark gap have floating potential, that is, the arrangement of the capacitor and spark gap can be interchanged. This makes it possible to choose a significantly higher capacitance of the capacitor, e.g. 150 pF or more. A larger capacity is sometimes required in order to optimize the smooth running of the spark gap depending on the size of the spark gap and the design features of the motor.
  • the invention can also be applied to ignition amplifier units which are not plugged directly onto the spark plug but are inserted into the ignition cable at a distance therefrom.
  • the resistor 2 can be omitted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Spark Plugs (AREA)

Claims (8)

  1. Unité d'amplification d'étincelle pour le circuit secondaire d'un dispositif d'allumage, comportant une résistance (2) reliée au câble d'allumage (3) et un circuit qui est monté en parallèle entre l'autre extrémité de la résistance et la masse et dont une branche contient un condensateur (4) et dont l'autre branche contient un élément de circuit éclateur (1) de bougie d'allumage, unité caractérisée par le fait que dans la branche contenant le condensateur, on insère en série avec le condensateur (4) un élément de circuit éclateur (5) de distance maximale entre électrodes 0,5mm.
  2. Unité d'amplification d'étincelle selon la revendication 1, caractérisée par le fait que la distance des électrodes de l'élément de circuit éclateur (5) vaut 0,05 à 0,2mm.
  3. Unité d'amplification d'étincelle selon la revendication 1 ou 2, sous forme d'une fiche de bougie d'allumage comportant un conducteur intérieur (6) en forme de tige, une douille isolante (9) qui l'entoure et une enveloppe conductrice (10) qui entoure la douille isolante, unité caractérisée par le fait que l'enveloppe (10) est recouverte, sur une moins une portion de sa surface extérieure, d'une feuille isolante (11), présentant au moins une découpe (12), de l'épaisseur de la distance désirée entre les électrodes de l'élément de circuit éclateur et par le fait que la découpe (12) est entièrement recouverte d'une pièce métallique (13) à relier à la masse.
  4. Unité d'amplification d'étincelle selon la revendication 3, caractérisée par le fait que la pièce métallique est une feuille de métal (13).
  5. Unité d'amplification d'étincelle selon la revendication 4, caractérisée par le fait que la feuille métallique (16) entoure complètement l'enveloppe conductrice (10).
  6. Unité d'amplification d'étincelle selon les revendications 3 à 5, caractérisée par le fait que la feuille isolante (11) et la feuille métallique (13) sont maintenues sur la douille isolante (9) au moyen d'un tube souple rétractable (15).
  7. Unité d'amplification d'étincelle selon la revendication 1 ou 2, sous la forme d'une fiche de bougie d'allumage comportant un conducteur intérieur (6) en forme de tige, une douille isolante (9) qui l'entoure et une enveloppe conductrice (10) qui entoure la douille isolante, unité caractérisée par le fait que l'enveloppe (10) comporte au moins sur sa face extérieure un revêtement de plastique (21) qui présente une épaisseur de 0,5 à 0,2mm et a une interruption annulaire (22), et par le fait que l'ensemble ainsi formé est entouré d'une enveloppe métallique (23) qui repose sur le revêtement de plastique (21) et enserre, par un verrouillage élastique (24), une portion d'extrémité qui s'ajuste sur une bougie d'allumage.
  8. Unité d'amplification d'étincelle selon la revendication 7, caractérisée par le fait que la portion d'extrémité située du côté du câble d'allumage est recouverte par un capuchon de caoutchouc (25).
EP87101169A 1986-01-31 1987-01-28 Unité d'amplification d'étincelle pour un dispositif d'allumage Expired - Lifetime EP0231024B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863603025 DE3603025A1 (de) 1986-01-31 1986-01-31 Zwischenschalteinheit fuer eine zuendanlage
DE3603025 1986-01-31

Publications (3)

Publication Number Publication Date
EP0231024A2 EP0231024A2 (fr) 1987-08-05
EP0231024A3 EP0231024A3 (en) 1988-03-23
EP0231024B1 true EP0231024B1 (fr) 1991-10-23

Family

ID=6293112

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87101169A Expired - Lifetime EP0231024B1 (fr) 1986-01-31 1987-01-28 Unité d'amplification d'étincelle pour un dispositif d'allumage

Country Status (5)

Country Link
US (1) US4983882A (fr)
EP (1) EP0231024B1 (fr)
JP (1) JPS62208584A (fr)
DE (1) DE3603025A1 (fr)
ES (1) ES2027236T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3727459C2 (de) * 1987-08-18 1999-02-11 Bayerische Motoren Werke Ag Zündsystem für Brennkraftmaschinen
US5421312A (en) * 1990-11-03 1995-06-06 Dawson Royalties Limited Electrical circuit
JPH06196249A (ja) * 1992-01-06 1994-07-15 Kaname Iketani ガソリンを燃料とする内燃機関のダブル点火方式点火栓一回路方式及び電気火花発生器
CN1511230A (zh) * 2001-07-31 2004-07-07 �����˰�װ�������޹�˾ 线圈火花塞电容性信号放大装置以及确定燃烧时间的方法
DE102011117600A1 (de) * 2011-11-04 2013-05-08 Andreas Stihl Ag & Co. Kg Zündvorrichtung für einen Zweitaktmotor

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB262420A (fr) * 1900-01-01
US3244924A (en) * 1964-02-24 1966-04-05 Berg Variable spark gap for engine ignition systems
US3353052A (en) * 1964-07-15 1967-11-14 George H Barry Spark plug having an auxiliary series spark gap in parallel with the main spark gap
US4123688A (en) * 1975-02-13 1978-10-31 Murata Manufacturing Co., Ltd. Spark plug cap
US3963295A (en) * 1975-04-21 1976-06-15 Amp Incorporated Heat-shrinkable molded high voltage connector
JPS5493729A (en) * 1977-12-30 1979-07-25 Toyota Central Res & Dev Lab Inc Resistor built-in attachment for ignition circuit
FR2445450A1 (fr) * 1978-12-26 1980-07-25 Bordelles Christian Convertisseur d'allumage par eclateurs en cascades
DE3308522A1 (de) * 1983-03-10 1984-09-13 Robert Bosch Gmbh, 7000 Stuttgart Zuendkerze fuer brennkraftmaschinen
US4451764A (en) * 1983-05-05 1984-05-29 Gerry Martin E Ignition system high voltage cable with minimized radio interference
DE3347027A1 (de) * 1983-12-24 1985-07-04 Robert Bosch Gmbh, 7000 Stuttgart Zuendkerze fuer eine brennkraftmaschine

Also Published As

Publication number Publication date
DE3603025A1 (de) 1987-08-06
US4983882A (en) 1991-01-08
EP0231024A2 (fr) 1987-08-05
JPS62208584A (ja) 1987-09-12
EP0231024A3 (en) 1988-03-23
ES2027236T3 (es) 1992-06-01

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