EP1957789A1 - Method and device for providing diagnostics for an internal combustion engine ignition coil - Google Patents

Method and device for providing diagnostics for an internal combustion engine ignition coil

Info

Publication number
EP1957789A1
EP1957789A1 EP06842076A EP06842076A EP1957789A1 EP 1957789 A1 EP1957789 A1 EP 1957789A1 EP 06842076 A EP06842076 A EP 06842076A EP 06842076 A EP06842076 A EP 06842076A EP 1957789 A1 EP1957789 A1 EP 1957789A1
Authority
EP
European Patent Office
Prior art keywords
spark plug
spark
coil
ignition coil
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.)
Withdrawn
Application number
EP06842076A
Other languages
German (de)
French (fr)
Inventor
Daniel Stauner
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 EP1957789A1 publication Critical patent/EP1957789A1/en
Withdrawn legal-status Critical Current

Links

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
    • F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
    • F02P17/12—Testing characteristics of the spark, ignition voltage or current
    • 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
    • H01T13/58—Testing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
    • 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
    • F02P3/00—Other installations
    • F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
    • 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
    • H01T13/02—Details
    • H01T13/04—Means providing electrical connection to sparking plugs

Definitions

  • the present invention relates to a device for diagnosing an organ making up internal combustion engines. It relates more particularly to the detection of a malfunction of an ignition coil of such an engine.
  • the mechanic can only carry out the ignition coil operation tests when the vehicle is stopped.
  • the ignition voltage requirements are lower when stopped than when accelerating at full load of the engine. It is possible that a coil provides sufficient voltage when stopped but that for certain operating points it is defective. This deficiency cannot be detected by the operator if he implements the method described above.
  • a "diagnostic suitcase" composed of a portable computer connecting to and interacting with the engine computers has also been proposed.
  • the present invention proposes to remedy the drawbacks of the prior art, by providing a method and a device for diagnosing the operating state of the ignition coil, inexpensive, particularly simple to implement and independent of the level. operator experience.
  • Another object of the present invention is to provide a method and a device for its implementation, making it possible to test the operation of the coil for all of its operating points, without damaging the coil or the ignition circuit.
  • the invention provides a method for diagnosing the operation of an ignition coil of an internal combustion engine, further comprising at least one electrical cable connecting the ignition coil to at least one spark plug located in an engine cylinder head, characterized in that the method comprises at least the steps consisting in:
  • - have the coil supply a so-called diagnostic voltage, greater than a threshold value necessary for the formation of a spark by the spark plug
  • - have the coil supply a so-called diagnostic voltage, greater than a threshold value necessary for the formation of a spark by the spark plug, so as to cause the formation of a spark, between the electrode center of the spark plug and a conducting element of the switch and
  • the verification step consists of noting engine combustion misfires.
  • the step of verifying the formation of a spark consists in visualizing an image of the current passing through the switch.
  • the verification step consists of visualizing a spark produced within the switch.
  • the invention also provides a device for diagnosing the operation of an ignition coil of an internal combustion engine, further comprising at least one electrical cable connecting the coil to at least one spark plug located in the cylinder head of the engine characterized in that said device comprises a conductive element, intended on the one hand to be electrically and temporarily connected to the ignition coil to be tested and on the other hand, intended to be placed, during the diagnosis, at a distance not null and adjustable of the part, external to the cylinder head, of the central electrode of said spark plug, so as to allow the formation of a spark, between the central electrode of the spark plug and the element driver during engine operation.
  • the conductive element is integral with an insulating element in which it is partially housed, and the length of the insulating element is a function of the distance d.
  • the conductive element is a metal rod housed in a passage arranged in the insulating element, said rod protruding inside and outside the insulating element.
  • the insulating element is a tube, the passage being substantially coaxial with the axis of the insulating tube and, the rod being glued or screwed to the tube over a portion of its length.
  • the conducting element is the central electrode of a test spark plug devoid of its ground electrode, said test spark plug being partially inserted in the insulating tube at its end opposite to the spark plug.
  • the insulating element includes a light for monitoring the formation of a spark in the insulating tube during diagnosis.
  • An element facilitating the vision of the spark is inserted in the control light.
  • FIG. 1 is a schematic view of a conventional ignition circuit
  • FIG. 2 is a schematic view in axial section of a first embodiment of the device according to the invention
  • FIG. 3 is a schematic view in axial section of a second embodiment of the present invention.
  • FIG. 4 is a schematic view in axial section of the preferred embodiment of the present invention.
  • the conventional ignition circuit 6 comprises a coil 11 whose primary winding is connected in series with a storage battery 7 and is electromagnetically coupled, to form a voltage transformer, a secondary winding placed in a high-voltage circuit comprising a burst air gap belonging to a spark plug 19.
  • intermittent cuts are made by a breaker 17, interposed in the electrical line returning to ground of the winding.
  • the opening and closing of the switch 17 is caused by an electronic control unit.
  • the breaker 17 is an element of the igniter 13.
  • the capacitor takes charge of inductor current and then discharges immediately.
  • the sudden variation of the flow in the primary circuit causes the formation of a high voltage current in the secondary winding and is then distributed to one of the spark plugs 19.
  • the method and the device according to the invention make it possible to detect a malfunction of the coil 1 1 of the type presented above.
  • the device and method according to the invention make it possible to artificially create an additional voltage requirement to force the coil to supply a high voltage close to the maximum voltage value that it can supply. More specifically, during normal idling, the spark plug must provide a voltage between 10 and 15 Kv.
  • the method and the device according to the invention make it possible, for example, to force the coil to supply a voltage greater than 25 Kv.
  • the need for voltage changes with the aging of the candles.
  • the ignition voltage for the formation of a spark reaches a value of the order of 30Kv when the spark plug is used.
  • the threshold to be reached by the ignition coil being around 25 KV, it guarantees an effective test on most spark plugs.
  • the device 20 consists of a second test spark plug 25 which is devoid of electrode mass, of a first external insulating tube 27 with an internal diameter slightly greater than that of the ceramic lower spout 29 of the test spark plug 25.
  • the tube 27 is screwed or glued to the ceramic spout 29.
  • the device according to the invention comprises also a second internal insulating tube 31 of smaller diameter and coaxial with the first insulating tube 27, the first tube 31 being able to be plugged in at one of its ends 31.a at the end 33 of the spark plug which is opposite to the lower ground electrode.
  • the other end 31. b of the second insulating tube 31 being glued to the ceramic spout 29 of the test spark plug 25.
  • a concave frustoconical recess 30 is provided in the ceramic spout 29.
  • the end 31. b of the insulating tube 31 intended to be glued to the spout ceramic 29 has a shape complementary to that of the concave recess 30 and is inserted therein for assembly by gluing of the assembly.
  • the purpose of the internal insulating tube 31 is, during the use of the device, to prevent the formation of a spark between the central electrode 32 of the test spark plug 25 and the base 35 of this same spark plug, or between the central electrode 32 of the test spark plug 25 and a metal surface of the engine, for example belonging to the spark plug well.
  • the ignition harness is disconnected connecting the spark plug 23 to the rest of the ignition circuit.
  • the device 20 according to the invention is then put in place on the spark plug 23. More specifically, the internal tube 31 is put in place on the free end 33 of the spark plug 23 while, the external tube 27 is in abutment on the base 37 of the spark plug 23.
  • the respective length of the two tubes is a function of the distance "d" which it is desired to leave between the central electrode of the test spark plug 25 and the conductive free end 33 of the spark plug. This distance "d” is a function of the voltage which it is desired to have supplied by the coil during the diagnosis.
  • the corresponding harness cable electric ignition is then connected to the free end 39 of the test spark plug 25. The engine is then started.
  • the voltage which it supplies will be insufficient for the formation of a spark, on the one hand between the central electrode 32 of the test spark plug 25 and the free conductive end 33 of the spark plug, and on the other hand between the electrodes 22 and 24 of the spark plug 23. Misfires will occur. These measured and / or felt misfires or an increase in the misfire rate indicate that the coil is presumed to be faulty.
  • FIG. 3 presents a simplified embodiment compared to the embodiment described above. In fact, in this embodiment, the base 35 of the test spark plug and the internal insulating tube 31 have been eliminated.
  • the value of the additional voltage necessary for the establishment of an electric arc between the central electrode 32 of the test spark plug 25 and the free conductive end 33 of the spark plug is adjusted by the choice of the length of the outer tube 27 or the length of the inner tube 31 if the latter is present.
  • the device according to the invention comprises an insulating element 41, or insulating tube 41, consisting of two coaxial cylinders 45 and 47.
  • a first hollowed-out lower cylinder 45 is open at its end and the second upper cylinder 47 of smaller diameter is produced integrally with the first cylinder 45.
  • An axial passage 42 passing through the upper cylinder 47 and opening into the internal cavity of the lower cylinder 45 is arranged in the insulating element 41. This passage opens into the recess of the lower cylinder 45.
  • a metal rod 49 of length greater than the total length or height of the passage 42, is inserted in the passage 42 so as to project upwards and towards the bottom of the upper cylinder 47. The metal rod 49 is screwed or glued in the passage 42.
  • the metal rod 49 has at its upper free end 59. projecting from the outside of the second cylinder a groove forming a split head 55 able to cooperate with a screwdriver.
  • the free end of the second cylinder is able to cooperate with the tip of the ignition electrical harness (not shown) in order to electrically connect said harness and the metal rod 49.
  • the lower cylinder 45 has a light 51 to allow the operator to see the spark emerging between the metal rod 49 and the central electrode of the spark plug 23.
  • This light 51 extends from the radial outer face 55 of the lower cylinder 45 and opens into the recess 53 of the first cylinder near the lower end 59. b of the metal rod 59.
  • an optical fiber or a transparent bar may be inserted (e) in visibility light 51.
  • the ignition harness is disconnected connecting the spark plug 23 to the rest of the ignition circuit.
  • the device 41 according to the invention is then placed on the base 37 of the spark plug 21.
  • the recess 53 of the first cylinder has a diameter greater than that of the part of the spark plug 23 which extends outside of the cylinder head 21 of the engine, surrounded by the device 41, but of diameter smaller than that of the base 37 of the spark plug 23. This allows the insertion of the external part of the spark plug 23 in the recess 53 of the insulating element 41.
  • the device 41 abuts the upper face 37. a of the base 37 of the spark plug 23.
  • the device 41 is dimensioned so that the metal rod 49 is coaxial with the spark plug d ignition 23, and so that there is a non-zero distance "d" between the opposite ends of the free conductive end 33 of the spark plug 23 and said metal rod 49.
  • the distance "d” can also be adjusted by an operator using the groove 55 by means of a screwdriver. By adjusting this distance, the value of the additional voltage necessary for the establishment of an electric arc between the metal rod 49 and the central electrode of the spark plug 23 can be adjusted.
  • the engine is then started. If the ignition coil is defective, the voltage it supplies will be insufficient to form a spark, a part between the metal rod 49 and the central electrode of the spark plug, and other part between the electrodes of the spark plug 23. Misfire will therefore occur. These measured or perceived failures, or an increase in the failure rate will indicate that the coil is presumed to be faulty. In addition, thanks to the light 51 the operator will be able to see if the test sparks appear and to carry out a visual check of the good progress of the test.
  • the insulating tube 27 or 41 may be made of a transparent material.
  • the invention makes it possible to control the voltage which the ignition coil will have to deliver during the test phases.

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)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Testing Of Engines (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

Method providing the diagnostics of the operation of an internal combustion engine ignition coil further comprising at least one electric cable connecting the ignition coil to at least one spark plug (19) installed in a cylinder head of the engine, characterized in that the method consists in: temporarily introducing a voltage-controlled switch (27, 25, 29) into the ignition circuit, causing the coil to supply a so-called diagnostics voltage higher than a threshold value needed for the spark plug to form a spark, so as to cause a spark to form between the central electrode of the spark plug (23) and a conducting element of the switch, and checking that a spark actually is formed in response to the said supply.

Description

PROCEDE ET DISPOSITIF DE DIAGNOSTIC D'UNE METHOD AND DEVICE FOR DIAGNOSING A
BOBINE D'ALLUMAGE D'UN MOTEUR A IGNITION COIL OF A MOTOR
COMBUSTION INTERNE.  INTERNAL COMBUSTION.
La présente invention concerne un dispositif de diagnostic d'un organe composant les moteurs à combustion interne. Elle concerne plus particulièrement la détection d'un disfonctionnement d'une bobine d'allumage d'un tel moteur.  The present invention relates to a device for diagnosing an organ making up internal combustion engines. It relates more particularly to the detection of a malfunction of an ignition coil of such an engine.
Traditionnellement, afin de vérifier l'état de fonctionnement de la bobine d'allumage, les garagistes après avoir mis en marche le moteur, alors que le véhicule est à l'arrêt, déconnectent le câble d'alimentation d'une bougie d'allumage et approchent l'embout d'alimentation d'un point de masse du véhicule. Le diagnostic est réalisé en visualisant les étincelles naissant entre le câble d'alimentation lié à la bobine d'allumage et le point de masse du véhicule. Afin de forcer la bobine à fournir une tension supplémentaire, le garagiste éloigne progressivement l'électrode liée électriquement à la bobine du point de masse du véhicule.  Traditionally, to check the working condition of the ignition coil, garage owners after starting the engine, while the vehicle is stopped, disconnect the power cable from a spark plug and approach the feed end of a vehicle ground point. The diagnosis is carried out by visualizing the sparks arising between the power cable linked to the ignition coil and the earth point of the vehicle. In order to force the coil to supply additional voltage, the mechanic progressively moves the electrode electrically linked to the coil away from the earth point of the vehicle.
Cette technique empirique de diagnostic de la bobine dépend en grande partie de l'expérience et de la dextérité du garagiste et est donc peut fiable. En outre, elle peut conduire à la destruction de la bobine par perçage de l'isolant qui la protège, si le garagiste écarte trop l'électrode du point de masse du moteur.  This empirical technique for diagnosing the coil largely depends on the experience and skill of the mechanic and is therefore not very reliable. In addition, it can lead to the destruction of the coil by piercing the insulator which protects it, if the mechanic spreads the electrode too far from the earth point of the engine.
En outre, le garagiste ne peut effectuer les tests de fonctionnement de la bobine d'allumage qu'à l'arrêt du véhicule. Or, les besoins en tension d'allumage sont plus faibles à l'arrêt que lors d'une accélération à pleine charge du moteur. Il est possible qu'une bobine fournisse une tension suffisante à l'arrêt mais que pour certains points de fonctionnement elle soit défectueuse. Cette déficience ne peut pas être détectée par l'opérateur si il met en œuvre le procédé précédemment décrit. Aux fins de diagnostics des différents éléments du moteur, une "valise de diagnostic" composée d'un ordinateur portable se connectant aux calculateurs moteur et dialoguant avec ces derniers, a également été proposée. In addition, the mechanic can only carry out the ignition coil operation tests when the vehicle is stopped. However, the ignition voltage requirements are lower when stopped than when accelerating at full load of the engine. It is possible that a coil provides sufficient voltage when stopped but that for certain operating points it is defective. This deficiency cannot be detected by the operator if he implements the method described above. For the purpose of diagnosing the various elements of the engine, a "diagnostic suitcase" composed of a portable computer connecting to and interacting with the engine computers has also been proposed.
Toutefois, ce type de valise est difficile à mettre en œuvre et l'interprétation des informations recueillies est ardue. De plus des modules informatiques coûteux dédiés spécifiquement au diagnostic de l'allumage sont nécessaires pour détecter un disfonctionnement de la bobine.  However, this type of suitcase is difficult to implement and the interpretation of the information collected is difficult. In addition, expensive computer modules specifically dedicated to the ignition diagnosis are necessary to detect a malfunction of the coil.
La présente invention se propose de remédier aux inconvénients de l'art antérieur, en fournissant un procédé et un dispositif de diagnostic de l'état de fonctionnement de la bobine d'allumage, peu coûteux, particulièrement simple à mettre en œuvre et indépendant du niveau d'expérience de l'opérateur.  The present invention proposes to remedy the drawbacks of the prior art, by providing a method and a device for diagnosing the operating state of the ignition coil, inexpensive, particularly simple to implement and independent of the level. operator experience.
Un autre but de la présente invention est de fournir un procédé et un dispositif pour sa mise en œuvre, permettant de tester le fonctionnement de la bobine pour l'ensemble de ses points de fonctionnement, sans endommager la bobine ou le circuit d'allumage.  Another object of the present invention is to provide a method and a device for its implementation, making it possible to test the operation of the coil for all of its operating points, without damaging the coil or the ignition circuit.
L'invention propose un procédé de diagnostic du fonctionnement d'une bobine d'allumage d'un moteur à combustion interne, comportant en outre, au moins un câble électrique reliant la bobine d'allumage à au moins une bougie d'allumage implantée dans une culasse du moteur, caractérisé en ce que le procédé comporte au moins les étapes consistant à :  The invention provides a method for diagnosing the operation of an ignition coil of an internal combustion engine, further comprising at least one electrical cable connecting the ignition coil to at least one spark plug located in an engine cylinder head, characterized in that the method comprises at least the steps consisting in:
- introduire temporairement dans le circuit d'allumage un interrupteur commandé en tension,  - temporarily introduce a voltage-controlled switch into the ignition circuit,
- faire fournir par la bobine une tension dite de diagnostic, supérieure à une valeur de seuil nécessaire à la formation d'une étincelle par la bougie, - faire fournir par la bobine une tension dite de diagnostic, supérieure à une valeur de seuil nécessaire à la formation d'une étincelle par la bougie, de manière à provoquer la formation d'une étincelle, entre l'électrode centrale de la bougie d'allumage et un élément conducteur de l'interrupteur et, - have the coil supply a so-called diagnostic voltage, greater than a threshold value necessary for the formation of a spark by the spark plug, - have the coil supply a so-called diagnostic voltage, greater than a threshold value necessary for the formation of a spark by the spark plug, so as to cause the formation of a spark, between the electrode center of the spark plug and a conducting element of the switch and,
- vérifier la formation effective d'une étincelle en réponse à ladite fourniture.  - check the actual formation of a spark in response to said supply.
L'étape de vérification consiste à constater des ratés de combustion moteur.  The verification step consists of noting engine combustion misfires.
Selon une caractéristique de l'invention, l'étape de vérification de la formation d'une étincelle consiste à visualiser une image du courant traversant l'interrupteur.  According to a characteristic of the invention, the step of verifying the formation of a spark consists in visualizing an image of the current passing through the switch.
L'étape de vérification consiste à visualiser une étincelle produite au sein de l'interrupteur.  The verification step consists of visualizing a spark produced within the switch.
L'invention propose aussi un dispositif de diagnostic du fonctionnement d'une bobine d'allumage d'un moteur à combustion interne, comportant en outre au moins un câble électrique reliant la bobine à au moins une bougie d'allumage implantée dans la culasse du moteur caractérisé en ce que ledit dispositif comporte un élément conducteur, destiné d'une part à être électriquement et temporairement connecté à la bobine d'allumage à tester et d'autre part, destiné à être disposée, lors du diagnostic, à une distance non nulle et réglable de la partie, externe à la culasse, de l'électrode centrale de ladite bougie d'allumage, de manière à autoriser la formation d'une étincelle, entre l'électrode centrale de la bougie d'allumage et l'élément conducteurjors du fonctionnement du moteur.  The invention also provides a device for diagnosing the operation of an ignition coil of an internal combustion engine, further comprising at least one electrical cable connecting the coil to at least one spark plug located in the cylinder head of the engine characterized in that said device comprises a conductive element, intended on the one hand to be electrically and temporarily connected to the ignition coil to be tested and on the other hand, intended to be placed, during the diagnosis, at a distance not null and adjustable of the part, external to the cylinder head, of the central electrode of said spark plug, so as to allow the formation of a spark, between the central electrode of the spark plug and the element driver during engine operation.
L'élément conducteur est solidaire d'un élément isolant dans lequel il est partiellement logé, et la longueur de l'élément isolant est fonction de la distance d.  The conductive element is integral with an insulating element in which it is partially housed, and the length of the insulating element is a function of the distance d.
L'élément conducteur est une tige métallique logée dans un passage aménagé dans l'élément isolant, ladite tige faisant saillie à l'intérieur et à l'extérieur de l'élément isolant. L'élément isolant est un tube, le passage étant sensiblement coaxial à l'axe du tube isolant et, la tige étant collée ou vissée au tube sur une portion de sa longueur. The conductive element is a metal rod housed in a passage arranged in the insulating element, said rod protruding inside and outside the insulating element. The insulating element is a tube, the passage being substantially coaxial with the axis of the insulating tube and, the rod being glued or screwed to the tube over a portion of its length.
L'élément conducteur est l'électrode centrale d'une bougie d'allumage de test dépourvue de son électrode de masse, ladite bougie de test étant partiellement insérée dans le tube isolant à son extrémité opposée à la bougie d'allumage.  The conducting element is the central electrode of a test spark plug devoid of its ground electrode, said test spark plug being partially inserted in the insulating tube at its end opposite to the spark plug.
L'élément isolant comporte une lumière de contrôle de la formation d'une l'étincelle dans le tube isolant lors du diagnostic.  The insulating element includes a light for monitoring the formation of a spark in the insulating tube during diagnosis.
Un élément facilitant la vision de l'étincelle est inséré dans la lumière de contrôle.  An element facilitating the vision of the spark is inserted in the control light.
D'autres caractéristiques et avantages de la présente invention apparaîtront de manière plus claire à la lecture de la description détaillée, non limitative, de plusieurs modes de réalisation de la présente invention en référence aux annexés dans lesquels :  Other characteristics and advantages of the present invention will appear more clearly on reading the detailed, nonlimiting description of several embodiments of the present invention with reference to the appended documents in which:
- la figure 1 est une vue schématique d'un circuit d'allumage conventionnel  - Figure 1 is a schematic view of a conventional ignition circuit
- la figure 2 est une vue schématique en coupe axiale d'un premier mode de réalisation du dispositif selon l'invention  - Figure 2 is a schematic view in axial section of a first embodiment of the device according to the invention
- la figure 3 est une vue schématique en coupe axiale d'un second mode de réalisation de la présente invention.  - Figure 3 is a schematic view in axial section of a second embodiment of the present invention.
- la figure 4 est une vue schématique en coupe axiale du mode de réalisation préféré de la présente invention.  - Figure 4 is a schematic view in axial section of the preferred embodiment of the present invention.
On se reporte à présent à la figure 1. Le circuit d'allumage conventionnel 6 comporte une bobine 11 dont l'enroulement primaire est relié en série avec une batterie d'accumulateur 7 et est couplé électromagnétiquement, pour constituer un transformateur de tension, à un enroulement secondaire placé dans un circuit haute tension comportant un entrefer d'éclatement appartenant à une bougie 19. Dans ce système d'allumage, les coupures intermittentes sont réalisées par un rupteur 17, interposé dans la ligne électrique de retour à la masse du bobinage. L' ouverture et la fermeture du rupteur 17 sont provoquées par une unité électronique de commande. Le rupteur 17 est un élément de l'allumeur 13. Au moment où le circuit primaire se ferme, le courant s'établit progressivement et lorsqu'il s'ouvre, ce courant se trouve alors dérivé vers le condensateur 15 branché aux bornes du rupteur 17. Le condensateur se charge de courant de self puis se décharge aussitôt. La variation brutale du flux dans le circuit primaire provoque la formation d'un courant haute tension dans l'enroulement secondaire puis est distribué vers l'une des bougies 19. Referring now to Figure 1. The conventional ignition circuit 6 comprises a coil 11 whose primary winding is connected in series with a storage battery 7 and is electromagnetically coupled, to form a voltage transformer, a secondary winding placed in a high-voltage circuit comprising a burst air gap belonging to a spark plug 19. In this ignition system, intermittent cuts are made by a breaker 17, interposed in the electrical line returning to ground of the winding. The opening and closing of the switch 17 is caused by an electronic control unit. The breaker 17 is an element of the igniter 13. When the primary circuit closes, the current gradually builds up and when it opens, this current is then diverted to the capacitor 15 connected to the terminals of the breaker 17. The capacitor takes charge of inductor current and then discharges immediately. The sudden variation of the flow in the primary circuit causes the formation of a high voltage current in the secondary winding and is then distributed to one of the spark plugs 19.
Le procédé et le dispositif selon l'invention permettent de détecter un disfonctionnement de la bobine 1 1 du type de celle présentée ci-dessus.  The method and the device according to the invention make it possible to detect a malfunction of the coil 1 1 of the type presented above.
Le dispositif et le procédé selon l'invention permettent de créer artificiellement un besoin supplémentaire en tension pour forcer la bobine à fournir une tension élevée proche de la valeur de tension maximale qu'elle peut fournir. Plus précisément, lors d'un fonctionnement normal au ralenti, la bougie d'allumage doit fournir une tension comprise entre 10 et 15 Kv. Le procédé et le dispositif selon l'invention permettent par exemple de forcer la bobine à fournir une tension supérieure à 25 Kv.  The device and method according to the invention make it possible to artificially create an additional voltage requirement to force the coil to supply a high voltage close to the maximum voltage value that it can supply. More specifically, during normal idling, the spark plug must provide a voltage between 10 and 15 Kv. The method and the device according to the invention make it possible, for example, to force the coil to supply a voltage greater than 25 Kv.
De plus, le besoin en tension évolue avec le vieillissement des bougies. En effet, la tension d'allumage pour la formation d'une étincelle atteint une valeur de l'ordre de 30Kv lorsque la bougie est usagée. Le seuil que doit atteindre la bobine d'allumage étant de l'ordre de 25 KV, il garantit un test efficace sur la majorité des bougies d'allumage.  In addition, the need for voltage changes with the aging of the candles. Indeed, the ignition voltage for the formation of a spark reaches a value of the order of 30Kv when the spark plug is used. The threshold to be reached by the ignition coil being around 25 KV, it guarantees an effective test on most spark plugs.
En se reportant à la figure 2, on voit une bougie d'allumage 23, semblable à l'une de bougie 19 de la figure 1 , en position montée dans une culasse 21 du moteur à combustion interne. Le dispositif 20 selon l'invention est constitué d'une seconde bougie de test 25 qui est dépourvue d'électrode de masse, d'un premier tube isolant 27 externe de diamètre interne légèrement supérieur à celui du bec inférieur en céramique 29 de la bougie de test 25. Le tube 27 est vissé ou collé au bec en céramique 29. Le dispositif selon l'invention comporte aussi un second tube isolant 31 interne de diamètre inférieur et coaxial au premier tube isolant 27, le premier tube 31 étant apte à s'enficher à une de ses extrémités 31.a à l'extrémité 33 de la bougie qui est opposée à l'électrode inférieur de masse. L'autre extrémité 31. b du second tube isolant 31 étant collée au bec de céramique 29 de la bougie de test 25. Referring to Figure 2, we see a spark plug 23, similar to one of the spark plug 19 of Figure 1, in the mounted position in a cylinder head 21 of the internal combustion engine. The device 20 according to the invention consists of a second test spark plug 25 which is devoid of electrode mass, of a first external insulating tube 27 with an internal diameter slightly greater than that of the ceramic lower spout 29 of the test spark plug 25. The tube 27 is screwed or glued to the ceramic spout 29. The device according to the invention comprises also a second internal insulating tube 31 of smaller diameter and coaxial with the first insulating tube 27, the first tube 31 being able to be plugged in at one of its ends 31.a at the end 33 of the spark plug which is opposite to the lower ground electrode. The other end 31. b of the second insulating tube 31 being glued to the ceramic spout 29 of the test spark plug 25.
Afin de faciliter la mise en place de la bougie de test 25 sur le tube isolant 31 , un évidement tronconique concave 30 est aménagé dans le bec de céramique 29. L'extrémité 31. b du tube isolant 31 destinée à être collée au bec de céramique 29 a une forme complémentaire de celle de l'évidement concave 30 et est insérée dans celui-ci pour un assemblage par collage de l'ensemble.  In order to facilitate the positioning of the test plug 25 on the insulating tube 31, a concave frustoconical recess 30 is provided in the ceramic spout 29. The end 31. b of the insulating tube 31 intended to be glued to the spout ceramic 29 has a shape complementary to that of the concave recess 30 and is inserted therein for assembly by gluing of the assembly.
Le tube isolant interne 31 a pour but, lors de l'utilisation du dispositif, de prévenir la formation d'une étincelle entre l'électrode centrale 32 de la bougie de test 25 et le culot 35 de cette même bougie, ou entre l'électrode centrale 32 de la bougie de test 25 et une surface métallique du moteur, par exemple appartenant au puit de bougie.  The purpose of the internal insulating tube 31 is, during the use of the device, to prevent the formation of a spark between the central electrode 32 of the test spark plug 25 and the base 35 of this same spark plug, or between the central electrode 32 of the test spark plug 25 and a metal surface of the engine, for example belonging to the spark plug well.
Afin de tester la bobine d'allumage, on déconnecte le faisceau électrique d'allumage reliant la bougie 23 au reste du circuit d'allumage. Le dispositif 20 selon l'invention est alors mis en place sur la bougie d'allumage 23. Plus précisément, le tube interne 31 est mis en place sur l'extrémité libre 33 de la bougie d'allumage 23 alors que, le tube externe 27 est en buté sur le culot 37 de la bougie d'allumage 23. La longueur respective des deux tubes est fonction de la distance "d" que l'on désire laisser entre l'électrode centrale de la bougie de test 25 et l'extrémité libre 33 conductrice de la bougie d'allumage. Cette distance "d" est fonction de la tension que l'on désire faire fournir par la bobine lors du diagnostic. Le câble correspondant du faisceau électrique d'allumage est alors connecté à l'extrémité libre 39 de la bougie de test 25. Le moteur est ensuite mis en marche. In order to test the ignition coil, the ignition harness is disconnected connecting the spark plug 23 to the rest of the ignition circuit. The device 20 according to the invention is then put in place on the spark plug 23. More specifically, the internal tube 31 is put in place on the free end 33 of the spark plug 23 while, the external tube 27 is in abutment on the base 37 of the spark plug 23. The respective length of the two tubes is a function of the distance "d" which it is desired to leave between the central electrode of the test spark plug 25 and the conductive free end 33 of the spark plug. This distance "d" is a function of the voltage which it is desired to have supplied by the coil during the diagnosis. The corresponding harness cable electric ignition is then connected to the free end 39 of the test spark plug 25. The engine is then started.
Si la bobine d'allumage est défectueuse, la tension qu'elle fournit sera insuffisante pour la formation d'une étincelle, d'une part entre l'électrode centrale 32 de la bougie de test 25 et l'extrémité libre conductrice 33 de la bougie d'allumage, et, d'autre part entre les électrodes 22 et 24 de la bougie d'allumage 23. Des ratés de combustion auront lieu. Ces ratés mesurés et/ou ressentis ou une augmentation du taux de ratés indiquent que la bobine est présumée défaillante.  If the ignition coil is defective, the voltage which it supplies will be insufficient for the formation of a spark, on the one hand between the central electrode 32 of the test spark plug 25 and the free conductive end 33 of the spark plug, and on the other hand between the electrodes 22 and 24 of the spark plug 23. Misfires will occur. These measured and / or felt misfires or an increase in the misfire rate indicate that the coil is presumed to be faulty.
La figure 3 présente un mode de réalisation simplifié par rapport au mode de réalisation précédemment décrit. En effet, dans ce mode de réalisation, le culot 35 de la bougie de test et le tube isolant interne 31 ont été supprimés.  FIG. 3 presents a simplified embodiment compared to the embodiment described above. In fact, in this embodiment, the base 35 of the test spark plug and the internal insulating tube 31 have been eliminated.
L'utilisation du dispositif selon ce mode réalisation, est conforme à la description précédemment donnée.  The use of the device according to this embodiment conforms to the description previously given.
Pour les deux modes de réalisation précédents, la valeur de la tension additionnelle nécessaire à l'établissement d'un arc électrique entre l'électrode centrale 32 de la bougie de test 25 et l'extrémité libre conductrice 33 de la bougie d'allumage, est ajustée par le choix de la longueur du tube extérieur 27 ou de la longueur du tube interne 31 si celui-ci est présent.  For the two previous embodiments, the value of the additional voltage necessary for the establishment of an electric arc between the central electrode 32 of the test spark plug 25 and the free conductive end 33 of the spark plug, is adjusted by the choice of the length of the outer tube 27 or the length of the inner tube 31 if the latter is present.
Dans le mode de réalisation de la figure 4, le dispositif selon l'invention comporte un élément isolant 41 , ou tube isolant 41 , constitué de deux cylindres coaxiaux 45 et 47. Un premier cylindre inférieur 45 évidé est ouvert à son extrémité et le second cylindre supérieur 47 de diamètre inférieur est réalisé venue de matière avec le premier cylindre 45. Un passage axial 42 traversant le cylindre supérieur 47 et débouchant dans la cavité interne du cylindre inférieur 45 est aménagé dans l'élément isolant 41. Ce passage débouche dans l'évidement du cylindre inférieur 45. Une tige métallique 49, de longueur supérieure à la longueur totale ou hauteur du passage 42, est insérée dans le passage 42 de manière à faire saillie vers le haut et vers le bas du cylindre supérieur 47. La tige métallique 49 est vissée ou collée dans le passage 42. In the embodiment of FIG. 4, the device according to the invention comprises an insulating element 41, or insulating tube 41, consisting of two coaxial cylinders 45 and 47. A first hollowed-out lower cylinder 45 is open at its end and the second upper cylinder 47 of smaller diameter is produced integrally with the first cylinder 45. An axial passage 42 passing through the upper cylinder 47 and opening into the internal cavity of the lower cylinder 45 is arranged in the insulating element 41. This passage opens into the recess of the lower cylinder 45. A metal rod 49, of length greater than the total length or height of the passage 42, is inserted in the passage 42 so as to project upwards and towards the bottom of the upper cylinder 47. The metal rod 49 is screwed or glued in the passage 42.
La tige métallique 49 comporte à son extrémité libre supérieure 59. a faisant saillie à l'extérieur du second cylindre une rainure formant tête fendue 55 apte à coopérer avec un tournevis.  The metal rod 49 has at its upper free end 59. projecting from the outside of the second cylinder a groove forming a split head 55 able to cooperate with a screwdriver.
L'extrémité libre du second cylindre est apte à coopérer avec l'embout du faisceau électrique d'allumage (non représenté) afin de relier électriquement ledit faisceau et la tige métallique 49.  The free end of the second cylinder is able to cooperate with the tip of the ignition electrical harness (not shown) in order to electrically connect said harness and the metal rod 49.
Le cylindre inférieur 45 comporte une lumière 51 pour permettre à l'opérateur de voir l'étincelle naissant entre la tige métallique 49 et l'électrode centrale de la bougie d'allumage 23. Cette lumière 51 s'étend depuis la face extérieure radiale 55 du cylindre inférieur 45 et débouche dans l'évidement 53 du premier cylindre à proximité de l'extrémité inférieure 59. b de la tige métallique 59. Afin d'améliorer la visibilité des étincelles, une fibre optique ou un barreau transparent peut-être inséré(e) dans la lumière de visibilité 51.  The lower cylinder 45 has a light 51 to allow the operator to see the spark emerging between the metal rod 49 and the central electrode of the spark plug 23. This light 51 extends from the radial outer face 55 of the lower cylinder 45 and opens into the recess 53 of the first cylinder near the lower end 59. b of the metal rod 59. In order to improve the visibility of the sparks, an optical fiber or a transparent bar may be inserted (e) in visibility light 51.
Afin de tester une bobine d'allumage, on déconnecte le faisceau électrique d'allumage reliant la bougie 23 au reste du circuit d'allumage. Le dispositif 41 selon l'invention est alors mis en place sur le culot 37 de la bougie d'allumage 21. L'évidement 53 du premier cylindre est de diamètre supérieur à celui de la partie de la bougie 23 qui s'étend hors de la culasse 21 du moteur, entouré par le dispositif 41 , mais de diamètre inférieur à celui du culot 37 de la bougie 23. Ceci autorise l'insertion de la partie externe de la bougie d'allumage 23 dans l'évidement 53 de l'élément isolant 41. Lors de son montage, le dispositif 41 vient en butée la face supérieure 37. a du culot 37 de la bougie d'allumage 23. Le dispositif 41 est dimensionné de manière que la tige métallique 49 soit coaxiale à la bougie d'allumage 23, et de manière qu'il existe une distance "d" non nulle entre les extrémités en vis-à- vis de l'extrémité libre conductrice 33 de la bougie d'allumage 23 et ladite tige de métallique 49. Dans le cas d'une tige métallique vissée dans le passage traversant le cylindre supérieur 47, la distance "d" peut aussi être réglée par un opérateur grâce à la rainure 55 au moyen d'un tournevis. En réglant cette distance on peut régler la valeur de la tension additionnelle nécessaire à l'établissement d'un arc électrique entre la tige métallique 49 et l'électrode centrale de la bougie d'allumage 23. In order to test an ignition coil, the ignition harness is disconnected connecting the spark plug 23 to the rest of the ignition circuit. The device 41 according to the invention is then placed on the base 37 of the spark plug 21. The recess 53 of the first cylinder has a diameter greater than that of the part of the spark plug 23 which extends outside of the cylinder head 21 of the engine, surrounded by the device 41, but of diameter smaller than that of the base 37 of the spark plug 23. This allows the insertion of the external part of the spark plug 23 in the recess 53 of the insulating element 41. When it is mounted, the device 41 abuts the upper face 37. a of the base 37 of the spark plug 23. The device 41 is dimensioned so that the metal rod 49 is coaxial with the spark plug d ignition 23, and so that there is a non-zero distance "d" between the opposite ends of the free conductive end 33 of the spark plug 23 and said metal rod 49. In the case of a metal rod screwed into the passage through the upper cylinder 47, the distance "d" can also be adjusted by an operator using the groove 55 by means of a screwdriver. By adjusting this distance, the value of the additional voltage necessary for the establishment of an electric arc between the metal rod 49 and the central electrode of the spark plug 23 can be adjusted.
Le moteur est ensuite mis en marche. Si la bobine d'allumage est défectueuse, la tension qu'elle fournit sera insuffisante à la formation d'une étincelle, d'une parte entre la tige métallique 49 et l'électrode centrale de la bougie d'allumage, et d'autre part entre les électrodes de la bougie d'allumage 23. Des ratés de combustion auront donc lieu. Ces ratés mesurés ou ressentis, ou une augmentation du taux de raté indiqueront que la bobine est présumée défaillante. En outre, grâce à la lumière 51 l'opérateur pourra voir si les étincelles de test apparaissent et effectuer un contrôle visuel du bon déroulement du test.  The engine is then started. If the ignition coil is defective, the voltage it supplies will be insufficient to form a spark, a part between the metal rod 49 and the central electrode of the spark plug, and other part between the electrodes of the spark plug 23. Misfire will therefore occur. These measured or perceived failures, or an increase in the failure rate will indicate that the coil is presumed to be faulty. In addition, thanks to the light 51 the operator will be able to see if the test sparks appear and to carry out a visual check of the good progress of the test.
Selon l'invention, le tube isolant 27 ou 41 peut-être réaliser en un matériau transparent.  According to the invention, the insulating tube 27 or 41 may be made of a transparent material.
L'invention permet de maîtriser la tension que devra délivrer la bobine d'allumage lors des phases de test.  The invention makes it possible to control the voltage which the ignition coil will have to deliver during the test phases.

Claims

REVENDICATIONS
1 -Procédé de diagnostic du fonctionnement d'une bobine d'allumage d'un moteur à combustion interne, comportant en outre, au moins un câble électrique reliant la bobine d'allumage à au moins une bougie d'allumage (19) implantée dans une culasse du moteur caractérisé en ce que le procédé consiste à :  1 - Method for diagnosing the operation of an ignition coil of an internal combustion engine, further comprising at least one electric cable connecting the ignition coil to at least one spark plug (19) located in an engine cylinder head characterized in that the method consists in:
- introduire temporairement dans le circuit d'allumage un interrupteur (27, 25,29) commandé en tension,  - temporarily introduce a voltage-controlled switch (27, 25, 29) into the ignition circuit,
- faire fournir par la bobine une tension dite de diagnostic, supérieure à une valeur de seuil nécessaire à la formation d'une étincelle par la bougie, de manière à provoquer la formation d'une étincelle entre l'électrode centrale de la bougie d'allumage (23) et un élément conducteur de l'interrupteur et  - have the coil supply a so-called diagnostic voltage, greater than a threshold value necessary for the spark to form by the spark plug, so as to cause the formation of a spark between the central electrode of the spark plug ignition (23) and a conducting element of the switch and
- vérifier la formation effective d'une étincelle en réponse à ladite fourniture.  - check the actual formation of a spark in response to said supply.
2- Procédé de diagnostic selon la revendication 1 caractérisé en ce que l'étape de vérification consiste à mesurer des ratés de combustion moteur. 3 - Procédé de diagnostic selon la revendication 2 caractérisé en ce que l'étape de vérification de la formation d'une étincelle consiste à visualiser une image du courant traversant l'interrupteur (27,25,29).  2- A diagnostic method according to claim 1 characterized in that the verification step consists of measuring engine combustion misfires. 3 - A diagnostic method according to claim 2 characterized in that the step of verifying the formation of a spark consists in viewing an image of the current passing through the switch (27,25,29).
4- Procédé de diagnostic selon la revendication précédente caractérisé en ce que l'étape de vérification consiste à visualiser une étincelle produite au sein de l'interrupteur (27, 25, 29).  4- A diagnostic method according to the preceding claim characterized in that the verification step consists in viewing a spark produced within the switch (27, 25, 29).
5 - Dispositif de diagnostic du fonctionnement d'une bobine d'allumage d'un moteur à combustion interne comportant en outre au moins un câble électrique reliant la bobine à au moins une bougie d'allumage et au moins une bougie d'allumages implantée dans la culasse du moteur, caractérisé en ce que le dispositif comporte un élément conducteur (25,59) destiné d'une part à être électriquement et temporairement connecté à la bobine d'allumage à tester, et d'autre part destiné à être disposé, lors du diagnostic, à une distance (d) non nulle et réglable de la partie, externe à la culasse, de l'électrode centrale de ladite bougie d'allumage (23), de manière à autoriser la formation d'une étincelle, entre l'électrode centrale de la bougie d'allumage (23) et l'élément conducteur (25, 49), lors du fonctionnement du moteur. 5 - Device for diagnosing the operation of an ignition coil of an internal combustion engine further comprising at least one electric cable connecting the coil to at least one spark plug and at least one spark plug located in the cylinder head of the engine, characterized in that the device comprises a conductive element (25,59) intended for a part to be electrically and temporarily connected to the ignition coil to be tested, and secondly intended to be disposed, during the diagnosis, at a non-zero and adjustable distance (d) from the part, external to the cylinder head, of the central electrode of said spark plug (23), so as to allow the formation of a spark, between the central electrode of the spark plug (23) and the conductive element (25, 49), during engine operation.
6-Dispositif de diagnostic selon la revendication précédente caractérisé en ce que l'élément conducteur (25) est solidaire d'un élément isolant (27,41 ) dans lequel il s'insère partiellement, et en ce que la longueur de l'élément (27,47) est fonction de la distance d. 6-A diagnostic device according to the preceding claim characterized in that the conductive element (25) is integral with an insulating element (27,41) in which it is partially inserted, and in that the length of the element (27,47) is a function of the distance d.
7- Dispositif selon la revendication précédente caractérisé en ce que l'élément conducteur est une tige métallique (49) disposée dans un passage aménagé dans l'élément isolant (27,47), ladite tige faisant saillie à l'intérieur et à l'extérieur de l'élément isolant.  7- Device according to the preceding claim characterized in that the conductive element is a metal rod (49) disposed in a passage arranged in the insulating element (27,47), said rod protruding inside and outside of the insulating element.
8 - Dispositif selon la revendication précédente caractérisé en ce que l'élément isolant est un tube (41 ) et en ce que le passage est sensiblement coaxial à l'axe dudit tube isolant (41 ), et la tige étant colée ou vissée au tube (41 ) sur une portion de sa longueur. 8 - Device according to the preceding claim characterized in that the insulating element is a tube (41) and in that the passage is substantially coaxial with the axis of said insulating tube (41), and the rod being bonded or screwed to the tube (41) over a portion of its length.
9 - Dispositif selon la revendication 7 caractérisé en ce que l'élément conducteur est l'électrode centrale d'une bougie d'allumage (25) dépourvue de son électrode de masse, ladite bougie de test étant partiellement insérée dans le tube isolant (27) à son extrémité opposée à la bougie d'allumage (23).  9 - Device according to claim 7 characterized in that the conductive element is the central electrode of a spark plug (25) devoid of its ground electrode, said test spark plug being partially inserted in the insulating tube (27 ) at its end opposite the spark plug (23).
10 - Dispositif selon l'une quelconque des revendications 5 à 9 caractérisée en ce qu'il comporte une lumière (51 ) de contrôle de l'étincelle naissant dans le tube isolant (41 ) lors du diagnostic.  10 - Device according to any one of claims 5 to 9 characterized in that it comprises a light (51) for controlling the spark arising in the insulating tube (41) during the diagnosis.
1 1 - Dispositif selon la revendication précédente caractérisé en ce qu'un élément facilitant la vision de l'étincelle de test est inséré dans la lumière de contrôle (51 ).  1 1 - Device according to the preceding claim characterized in that an element facilitating the vision of the test spark is inserted into the control light (51).
EP06842076A 2005-12-05 2006-11-30 Method and device for providing diagnostics for an internal combustion engine ignition coil Withdrawn EP1957789A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0553728A FR2894298A1 (en) 2005-12-05 2005-12-05 METHOD AND DEVICE FOR DIAGNOSING AN IGNITION COIL OF AN INTERNAL COMBUSTION ENGINE
PCT/FR2006/051265 WO2007066031A1 (en) 2005-12-05 2006-11-30 Method and device for providing diagnostics for an internal combustion engine ignition coil

Publications (1)

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EP1957789A1 true EP1957789A1 (en) 2008-08-20

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EP06842076A Withdrawn EP1957789A1 (en) 2005-12-05 2006-11-30 Method and device for providing diagnostics for an internal combustion engine ignition coil

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US (1) US20090160450A1 (en)
EP (1) EP1957789A1 (en)
JP (1) JP2009518575A (en)
CN (1) CN101356363A (en)
FR (1) FR2894298A1 (en)
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WO (1) WO2007066031A1 (en)

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US9249773B2 (en) * 2012-10-23 2016-02-02 GM Global Technology Operations LLC Apparatus and method for static testing a spark plug assembled in an internal combustion engine including cracked ceramic insulator detection
RU2655681C1 (en) * 2017-08-28 2018-05-29 Алексей Николаевич Звеков Method of the ignition system components diagnostics by the spark discharges continuous sequence
RU2678872C1 (en) * 2017-10-24 2019-02-05 Алексей Николаевич Звеков Spark plug tester

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US1484335A (en) * 1924-02-19 kerrigan
US1487852A (en) * 1922-12-12 1924-03-25 Hanauer Henry Spark indicator and intensifier for gasoline engines
US1907069A (en) * 1929-05-25 1933-05-02 Herman C Heaton Indicator means for ignition systems and the like
US4384256A (en) * 1981-03-18 1983-05-17 Monte Ronald J Di Diagnostic ignition spark detector

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Title
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JP2009518575A (en) 2009-05-07
CN101356363A (en) 2009-01-28
FR2894298A1 (en) 2007-06-08
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RU2008127380A (en) 2010-01-20
US20090160450A1 (en) 2009-06-25

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