Abrégé

Provided is an internal combustion engine ignition device that allows superposition discharge using a sub-primary coil to be performed in a stable manner.　In the present invention, an ignition coil unit 10 of an internal combustion engine ignition system 1 comprises: a principal primary coil 111a that is controlled by an ignition signal Si; and an ignition coil 11 in which a sub-primary coil 111b controlled by a superposition signal Sp is provided to the primary side. If an abnormal state detecting means 154 detects an abnormal state where there is a risk that a superposition switch 151 for passing/blocking current to the sub-primary coil 111b cannot operate normally due to heat generation, a heat generation suppressing means 155 suppresses heat generation of the superposition switch 151.

Classes IPC  ?

• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire
• F02P 3/055 - Schéma de montage des circuits avec des moyens de protection pour prévenir des dégâts dans le circuit ou la bobine d'induction

Abrégé

Provided is an ignition device which is for an internal combustion engine and with which it is possible to achieve adequate ignition properties without a reduction in energy efficiency, and to suppress wear in spark plugs. A discharge stopping means 15 is provided, which short-circuits both ends of a primary coil 111 in an ignition coil 11. Within the discharge cycle, when discharge stop conditions are met in which sufficient discharge energy is considered to have been applied from the primary coil 111 to a secondary coil 112, a drive control device 3 for an internal combustion engine outputs a discharge stop command signal Sd2 to the discharge stopping means 15, and the primary coil 111 is short circuited.

Classes IPC  ?

• F02P 3/05 - Schéma de montage des circuits pour la commande de l'intensité du courant dans la bobine d'induction
• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire

Abrégé

Provided is an ignition device for an internal combustion engine with which it is possible to build in an automatic control function for improving the ignition performance of an ignition plug, without an increase in size or cost.　An ignition device 1 for an internal combustion engine, which employs a superimposed magnetic flux generated by means of energization of an auxiliary primary coil 111b to increase a change in magnetic flux after energization of a main ignition coil 111a has been shut off, thereby increasing a discharge energy applied to a secondary coil 112, is provided with: a superimposition switch 14 capable of controlling the amount of flow of a superimposed current I1b; and a superimposition control means 15 for instructing the superimposition switch 14 in such a way as to achieve an amount of flow of the superimposed current I1b suitable for improving the ignition performance.

Classes IPC  ?

• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire
• F02P 3/05 - Schéma de montage des circuits pour la commande de l'intensité du courant dans la bobine d'induction
• F02P 15/00 - Allumage par étincelle électrique ayant des caractéristiques non couvertes dans les groupes ou présentant un intérêt autre que celui visé par ces groupes

Abrégé

Provided is an ignition device for an internal combustion engine, with which it is possible to build in an automatic control function for improving the ignitability of a spark plug, without an increase in size and cost. This ignition device 1 for an internal combustion engine raises discharge energy, which is increased by means of a superposed magnetic flux that, by energising an auxiliary primary coil 111b, produces a change in magnetic flux following energisation cut-off of a main ignition coil 111a, said discharge energy being applied to a secondary coil 112. Said ignition device 1 for an internal combustion engine is provided with: an auxiliary primary coil energisation switch means 15 with which it is possible to control the flow rate of a superposed current I1b; and a superposition control means 16 which instructs the auxiliary primary coil energisation switch means 15 as to an increase in the superposed current I1b that is suitable for improving ignitability.

Classes IPC  ?

• F02P 15/10 - Allumage par étincelle électrique ayant des caractéristiques non couvertes dans les groupes ou présentant un intérêt autre que celui visé par ces groupes à étincelles électriques continues
• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire

Abrégé

Provided is an ignition device for an internal combustion engine that can improve ignitability by spark discharge generated in an ignition plug, and that can also avoid fuel consumption deterioration by optimizing power consumption for ignition. A superposition control means 31 of an internal combustion engine ignition device 1 superimposes a current on secondary side from a secondary current superposition means 50 to hold a secondary current at a first current value by satisfying a superposition control start condition after an ignition timing at which a primary current of an ignition coil 11A is cut off. Thereafter, when the change state of a secondary coil voltage assumed from a primary coil voltage satisfies a superposition reduction condition at a superposition control change timing, second superimposition control is performed to reduce the secondary current to a second current value which is lower than the first current value, whereby a discharge current is adjusted to be suitable for a flow rate of tumble flow acting within a plug gap of a spark plug 20, so that a discharge path of spark discharge is greatly expanded. Consequently, ignitability is increased, and power consumption by superimposition control is reduced.

Classes IPC  ?

• F02P 15/10 - Allumage par étincelle électrique ayant des caractéristiques non couvertes dans les groupes ou présentant un intérêt autre que celui visé par ces groupes à étincelles électriques continues
• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire

Abrégé

Provided is an ignition device for internal combustion engines that: is capable of improving the ignition performance of a spark discharge generated by a spark plug; optimizes power consumed for ignition; and is capable of reducing deterioration of fuel consumption. A superimposition control means 31 for the ignition device for internal combustion engines superimposes a current on the secondary side by using a secondary current superimposing means 50 and holds the secondary current to a set secondary current value, as a result of superimposition control start conditions being satisfied after an ignition timing at which a primary current for an ignition coil 11A is cut. The spark discharge of the spark plug 20 is greatly expanded and the ignition properties improved by, at the next superimposition control review timing: performing superimposition increase control whereby a second current value greater than a first current value is changed to the set secondary current value, if the set secondary current value is a first current value and the state of a primary coil voltage satisfies a secondary current addition condition; and performing superimposing reduction control whereby the first current value is changed to the set secondary current value, if the set secondary current value is the second current value and the state of the primary coil voltage satisfies a secondary current reduction condition.

Classes IPC  ?

• F02P 15/10 - Allumage par étincelle électrique ayant des caractéristiques non couvertes dans les groupes ou présentant un intérêt autre que celui visé par ces groupes à étincelles électriques continues
• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire

Abrégé

Provided is an ignition device for an internal combustion engine with which ignition performance by means of a spark discharge generated by a spark plug can be improved and the power consumption for ignition can be optimized, thereby reducing a deterioration in fuel efficiency. A superimposition control means 30A in this ignition device 1 for an internal combustion engine estimates a change in voltage for a secondary coil 112 from a change in voltage in a primary coil 111 as obtained by means of a primary coil voltage signal from an ignition coil unit 10A, and after an ignition timing for interrupting a primary current of an ignition coil 11A, when the state of the primary coil voltage satisfies a predetermined superimposition start condition in which it is difficult to maintain the discharge path of a spark discharge generated by a spark plug 20, the superimposition control means outputs a secondary current superimposition signal Sp to a secondary current superimposition means 50A, causing a current to be superimposed on a secondary side of the ignition coil from the current superimposition means 50A and thereby maintaining the discharge path of the spark discharge generated by a spark plug 20 and forming a large flame kernel, thus improving the ignition performance.

Classes IPC  ?

• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire
• F02P 15/10 - Allumage par étincelle électrique ayant des caractéristiques non couvertes dans les groupes ou présentant un intérêt autre que celui visé par ces groupes à étincelles électriques continues

Abrégé

Provided is an internal combustion engine ignition device which is capable of detecting the wear state of an ignition plug without having a dedicated high-voltage component and capable of accurately estimating the replacement timing for the ignition plug. The internal combustion engine ignition device is characterized by comprising an ignition coil 11 including a primary coil 11a which generates a normal magnetic flux in the forward direction when energized by a primary current and generates an interrupted magnetic flux in the reverse direction when the primary current is interrupted and a secondary coil 11b which generates a high voltage when the magnetic flux generated in the primary coil 11a acts thereon, a switch unit 12 for switching between energization by and interruption of the primary current, and an ignition control unit 30 for controlling the switching operation of the switch unit 12 so as to cause the ignition plug 40 to generate a spark discharge, said ignition control unit 30 having a primary coil voltage detection unit 31 for detecting a primary voltage generated in the primary coil 11a and a wear detection unit 32 for detecting wear in the discharge electrode of the ignition plug 40 by using the primary voltage at the time when the interrupted magnetic flux is acting on the secondary coil 11b.

Classes IPC  ?

• H01T 15/00 - Circuits spécialement adaptés aux éclateurs, p. ex. circuits d'allumage

Abrégé

Provided is an internal combustion engine ignition coil with which it is possible to align the position of a noise-prevention resistor appropriately and to maintain normal operation performance for a long time. The internal combustion engine ignition coil is provided with: a case 12 having an ignition coil body 11 embedded therein; a protector 13 which is joined to the case 12 and supplies an ignition plug with a high voltage generated by the ignition coil body 11; a noise-prevention resistor 14 which has electrodes on both longitudinal ends thereof and is electrically connected between the ignition coil body 11 and the ignition plug; a high-voltage terminal 16a joined to one electrode of the noise-prevention resistor 14; and a high-voltage terminal 16b joined to the other electrode of the noise-prevention resistor 14. The internal combustion engine ignition coil is characterized in that: the case 12 includes a joint portion 30 which protrudes from the portion accommodating the ignition coil body 11 and which has an opening portion; the high-voltage terminal 16a is fixed to the back side of the opening portion of the joint portion 30 so as to align the position of the noise-prevention resistor 14; and the joint portion 30 is formed with the high-voltage terminal 16b press-fitted into a distal end side of the opening portion so as to seal a casting insulating resin 18.

Classes IPC  ?

• F02P 15/00 - Allumage par étincelle électrique ayant des caractéristiques non couvertes dans les groupes ou présentant un intérêt autre que celui visé par ces groupes
• H01F 38/12 - Allumage, p. ex. pour moteurs à combustion interne

Abrégé

Provided is an internal combustion engine ignition device that is capable of maintaining stable combustion by ensuring a stable high current period through stable supplying of necessary and sufficient discharge energy without deteriorating fuel efficiency. An internal combustion engine ignition device 1 for causing an ignition plug 2 to discharge electricity has an ignition coil 11 formed of a main primary coil 111a that generates a forward magnetic flux when current is passed therethrough, a sub-primary coil 111b that generates a reverse superimposed magnetic flux when current is passed therethrough, and a secondary coil 112 on which the magnetic fluxes of the main primary coil 111a and the sub-primary coil 111b are applied. Thus, an excess/shortage of discharge energy is prevented and stable combustion of an internal combustion engine is efficiently maintained through a feedback control so as to bring an actually measured value of a superimposed current I1b or an actually measured value of a secondary current I2 close to a target value during superimposed discharge control for increasing the discharge energy of the secondary coil 112, by supplying power to the sub-primary coil 111b to generate a superimposed magnetic flux after current to the main primary coil 111b is cut off.

Classes IPC  ?

• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire
• F02P 15/10 - Allumage par étincelle électrique ayant des caractéristiques non couvertes dans les groupes ou présentant un intérêt autre que celui visé par ces groupes à étincelles électriques continues

Abrégé

Provided is an internal combustion engine ignition device capable of maintaining stable combustion without increasing an energization time for a main primary coil. An ignition coil 11 is composed of a main primary coil 111a in which a forward magnetic flux occurs when energized by a main switch element 12, a sub-primary coil 111b in which a forward magnetic flux occurs when energized in a first direction and a reverse magnetic flux occurs when energized in a second direction, and a secondary coil 112 on which the magnetic fluxes of the main primary coil 111a and the sub-primary coil 111b act. A sub-primary coil magnetic flux generation state switching unit 5 switches a magnetic flux generation state of the sub-primary coil 111b by controlling the energizing direction and energizing/interrupting timing of the main primary coil 111b. Operating instructions for the main switch element 12 and the sub-primary coil magnetic flux generation state switching unit 5 are provided by ignition control means 31 to adjust discharging energy to be applied to the secondary side and efficiently maintain stable combustion of an internal combustion engine.

Classes IPC  ?

• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire
• F02P 3/045 - Schéma de montage des circuits pour la commande du temps de fermeture ou d'ouverture
• F02P 15/10 - Allumage par étincelle électrique ayant des caractéristiques non couvertes dans les groupes ou présentant un intérêt autre que celui visé par ces groupes à étincelles électriques continues

Abrégé

Provided is an ignition device for an internal combustion engine with which a stable high-current period can be achieved and suitable combustion can be maintained without lengthening the energization time of a main primary coil, and with which an increase in the size of the ignition coil and a significant increase in the overall cost can be prevented. A compact and low-cost ignition coil 11 is configured from: a main primary coil 111a wherein energization magnetic flux that has been increased in the positive direction is sharply reduced by interrupting the current after energization has started; an auxiliary primary coil 111b wherein an overlapping magnetic flux in the opposite direction to the energization magnetic flus is generated by energization; and a secondary coil 112 that generates discharge energy due to the action of the sharply reduced energization magnetic flux and the overlapping magnetic flux. An ignition control means 31 issues an operation instruction to an auxiliary primary coil switch unit 5 that switches between energizing/interrupting current to the auxiliary primary coil 111b, and controls the energization/interruption of current to the main primary coil 111a, thereby holding a secondary current I2 at a high voltage over a long period of time, and enabling stable combustion in the internal combustion engine to be maintained.

Classes IPC  ?

• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire
• F02P 15/10 - Allumage par étincelle électrique ayant des caractéristiques non couvertes dans les groupes ou présentant un intérêt autre que celui visé par ces groupes à étincelles électriques continues

Abrégé

An ignition coil for an internal combustion engine is provided which can effectively prevent leakage of noise and of radio waves generated by sparking. The main part of the invention is an elastic O-ring 12, which is formed from an annular elastic resin material; when using said O-ring as a fixing means, a second cap 9 (on the second electrode side) of an electric noise suppressing resistor 10 is held and the gap occurring between the inner wall of the resistor housing 4 and the second cap 9 of the electric noise suppressing resistor 10 can be closed with a simple structure. Therefore, this ignition coil is characterized in that, after fixing the electric noise suppressing resistor 10 in the resistor body housing 4 by means of the elastic O-ring 12, leakage under the resistor housing unit 4 can be prevented even if an insulation material 5 is filled evenly in the resistor housing 4.

Classes IPC  ?

• H01F 38/12 - Allumage, p. ex. pour moteurs à combustion interne
• F02P 15/00 - Allumage par étincelle électrique ayant des caractéristiques non couvertes dans les groupes ou présentant un intérêt autre que celui visé par ces groupes

Abrégé

Provided is an internal combustion engine ignition device that can maintain stable combustion while suppressing an increase in the size of an ignition coil and an increase in cost. A small and low-cost ignition coil 113 is constituted by: a main primary coil 111a that causes interruption magnetic flux to be generated by interrupting a current after starting supply of electricity; a sub primary coil 111b that causes superimposition magnetic flux having the same direction as the interruption magnetic flux to be generated by supplying electricity after the generation of the interruption magnetic flux; and a secondary coil 112 in which discharge energy is generated by the actions of the interruption magnetic flux and the superimposition magnetic flux. An appropriate discharge pattern is realized in an internal combustion engine and stable combustion can be maintained in the internal combustion engine as a result of a configuration in which: the generation timing and duration of the superimposition magnetic flux are adjusted; a superimposition current sudden decrease suppressing means 14 softens sudden cutting of power supply to the sub primary coil 111b so as to gently reduce the superposition magnetic flux; and a secondary current I2 with which an ignition plug 2 can maintain a discharge is maintained for a long time.

Classes IPC  ?

• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire
• F02P 3/05 - Schéma de montage des circuits pour la commande de l'intensité du courant dans la bobine d'induction
• F02P 15/10 - Allumage par étincelle électrique ayant des caractéristiques non couvertes dans les groupes ou présentant un intérêt autre que celui visé par ces groupes à étincelles électriques continues

Abrégé

Provided is an ignition coil with which an increase in size and an increase in cost can be prevented, and with a structure suitable for an ignition device for an internal combustion engine capable of ignition control so as to maintain stable combustion without lengthening the energization time of a primary coil. In this ignition coil (10) a main primary coil (110), which generates a change in magnetic flux wherein the amount of magnetic flux is reduced by shutting off the current with a prescribed timing after energization has started in a combustion cycle, and an auxiliary primary coil (120), which generates additional magnetic flux in the same direction as the change in the magnetic flux by energizing with a given timing subsequent to the generation of the change in the magnetic flux, are provided in a laminated manner on a primary coil bobbin (130), thus configuring the main primary coil (100) compactly and inexpensively. By adjusting the generation timing and the continuation time for the additional magnetic flux from the auxiliary primary coil (120), the discharge energy generated by a secondary coil (200) can be formed in a discharge pattern suitable for the internal combustion engine, and stable combustion of the internal combustion engine can be maintained.

Classes IPC  ?

• F02P 15/08 - Allumage par étincelle électrique ayant des caractéristiques non couvertes dans les groupes ou présentant un intérêt autre que celui visé par ces groupes à étincelles multiples, c.-à-d. allumage simultané en différents endroits d'un même cylindre ou dans plusieurs cylindres
• F02P 15/10 - Allumage par étincelle électrique ayant des caractéristiques non couvertes dans les groupes ou présentant un intérêt autre que celui visé par ces groupes à étincelles électriques continues

Abrégé

Provided is an ignition coil for internal combustion engines, which enables increase in magnetic flux variation while securing sufficient mechanical strength of a permanent magnet. The present invention is characterized by comprising: a center iron core 12 that is inserted through the center hole of a primary coil 11 and the center hole of a secondary coil; an annular side iron core 13 that is joined to the center iron core 12 to form a magnetic circuit through which a first magnetic flux A generated by the primary coil passes; and a permanent magnet 14 that is located between the center iron core 12 and the side iron core 13 and that discharges, to the magnetic circuit, a second magnetic flux B flowing in a reverse direction of the first magnetic flux A and applies a magnetic bias, wherein the side iron core 13 has protruding portions protruding toward the lateral sides of T-shaped horizontal portions 12b of the center iron core 12, clearances 15 are each provided between the lateral side of T-shaped horizontal portion 12b of the center iron core 12 and the protruding portion of the side iron core 13, and the clearances 15 are provided such that magnetic resistance when the first magnetic flux A passes through the clearances 15 as magnetic paths is smaller than magnetic resistance when the first magnetic flux A passes through the permanent magnet 14 as a magnetic path.

Classes IPC  ?

• H01F 38/12 - Allumage, p. ex. pour moteurs à combustion interne
• F02P 15/00 - Allumage par étincelle électrique ayant des caractéristiques non couvertes dans les groupes ou présentant un intérêt autre que celui visé par ces groupes

Abrégé

Provided is an ignition device for an internal combustion engine with which it is possible to maintain stable combustion without increasing the time of current conduction to a primary coil. An ignition coil 113 is configured from a main primary coil 111a for generating an interrupting magnetic flux by interrupting the current after current conduction has been initiated at a prescribed timing in a combustion cycle, a sub primary coil 111b for generating an additional magnetic flux in the same direction as the interrupting magnetic flux by current conduction at any desired timing from the time of the interrupting magnetic flux generation onward, and a secondary coil 112 in which electrical discharge energy is generated using the interrupting magnetic flux and the additional magnetic flux via a center core 113, a suitable electrical discharge pattern being achieved in the internal combustion engine and stable combustion in the internal combustion engine being maintained by regulating the timing at which the additional magnetic flux is generated and the time duration for which the additional magnetic flux is continued.

Classes IPC  ?

• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire

Abrégé

Provided is an ignition device for an internal combustion engine with which it is possible to maintain stable combustion without increasing the time of electrical discharge of a spark plug. The turning on and off of a main IGBT 14a and a sub IGBT 14b is controlled by a main ignition signal S1 and a sub ignition signal S2 transmitted by an ignition control means 13, whereby a main primary current I1a is interrupted in accordance with the ignition timing of the combustion cycle and a main discharge voltage is generated on the secondary side of a main ignition coil 11, a sub primary current I1b is interrupted in the same time period whereby a sub discharge voltage is generated on the secondary side of a sub ignition coil 12, and the sub discharge voltage is superimposed on the main discharge voltage, whereby the dielectric breakdown voltage at the start of discharge of a spark plug 2 is increased, a high voltage is applied to the discharge gap of the spark plug 2 during the initial stage of flame kernel formation in the combustion chamber, strong flame kernels are generated, combustion speed is increased, and ignitability and combustion stability are improved.

Classes IPC  ?

• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire

Abrégé

Provided is a multiple igniter for an internal-combustion engine by means of which a minimum ignition operation can be maintained even if a multiple ignition control function breaks down/runs out of control due to exposure to heat/noise. Multiple ignition control means (6) for turning on/off an IGBT (5) that switches between conduction and interruption of electricity from a vehicle battery (4) to the primary side of an ignition coil (3) is separately composed of a main ignition signal transmission unit (61) that transmits an ignition command signal S0 from an engine control unit (7) as a main ignition signal S1, and a sub-ignition signal transmission unit (62) that generates and transmits a plurality of sub-ignition signals S2, and supplies the logical OR of the main ignition signal S1 and the sub-ignition signals S2 to the IGBT (5) as a multiple ignition signal S3. Thus, even if the sub-ignition signal transmission unit (62) breaks down and the sub-ignition signals S2 are not transmitted, a single ignition of an ignition plug (2) is reliably performed by the multiple ignition signal S3, which is based on the main ignition signal S1 from the main ignition signal transmission unit (61), thereby making it possible to prevent a cylinder from misfiring, or the engine from stopping.

Classes IPC  ?

• F02P 3/04 - Schéma de montage des circuits
• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire
• F02P 11/00 - Dispositifs de sécurité de l'allumage par étincelle électrique non prévus ailleurs
• F02P 15/00 - Allumage par étincelle électrique ayant des caractéristiques non couvertes dans les groupes ou présentant un intérêt autre que celui visé par ces groupes
• F02P 15/10 - Allumage par étincelle électrique ayant des caractéristiques non couvertes dans les groupes ou présentant un intérêt autre que celui visé par ces groupes à étincelles électriques continues

Abrégé

Provided is an ignition device for an internal combustion engine having excellent ignitability and combustion stability. This ignition device is characterized in that, in order to supply energy from an ignition coil (21) to a spark plug (3) via an ignition coil (22), a secondary coil end part (32a) of the ignition coil (21), which is the high-voltage side of a high voltage generated when the primary current of the ignition coil (21) is supplied/shut off by a semiconductor switch (34), is connected to a secondary coil end part (42b) of the ignition coil (22), which is the low-voltage side of the high voltage generated when the primary current of the ignition coil (22) is supplied/shut off by a semiconductor switch (43), and the ignition coil (21) and the ignition coil (22) are housed in the coil accommodation part of a case, said case being filled with a molding resin.

Classes IPC  ?

• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire
• F02P 3/02 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire comportant un stockage de l'énergie par induction, p. ex. aménagement des bobines d'induction
• F02P 3/04 - Schéma de montage des circuits

Abrégé

Provided is an ignition device for an internal combustion engine such that two ignition coils are easily connected to a single spark plug. A case (11) has: coil housing parts (21, 22) for respectively housing ignition coils (31, 32); high-voltage output parts (45, 46) for respectively supplying high voltages generated in secondary coils (42, 44) of the ignition coils (31, 32) to a spark plug (13); and a connection part (11a) which protrudes from the bottom end of the case (11) and connects to the top end of a protector (12). The protector (12) has a high-voltage connection part (51) which connects to the ends of high-voltage output part (45) and high-voltage output part (46) disposed in the connection part (11a) when the protector is connected to the connection part (11a) and electrically connects to the spark plug (13) which is connected to the bottom end. The high voltages respectively output from the ignition coils (31, 32) are combined at the high-voltage connection part (51) and supplied to the spark plug (13).

Classes IPC  ?

• F02P 15/00 - Allumage par étincelle électrique ayant des caractéristiques non couvertes dans les groupes ou présentant un intérêt autre que celui visé par ces groupes
• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire
• F02P 13/00 - Bougies structurellement combinées avec d'autres parties de moteurs à combustion interne

Abrégé

Provided is a misfire detection method for an internal combustion engine that accurately detects misfires in an internal combustion engine using a mixed gas that is difficult to ignite. This method is characterized by having a step wherein a high voltage excited in a secondary coil of an ignition coil is applied to a spark plug when a primary current has been cut off, a step wherein a discharge spark is generated in the spark plug to which the high voltage has been applied, and a secondary current is detected by a secondary current detection means when the secondary current flows in the secondary coil, and a step wherein an output signal from the secondary current detection means that has detected the secondary current is used by a control means to detect a combustion error in the cylinders, and in the step in which a combustion error is detected, the discharge time is measured from the output signal from the secondary current detection means, and when the measured discharge time is longer than a prescribed value indicating that the rise in the cylinder pressure has occurred normally, this is recognized as a combustion error.

Classes IPC  ?

• F02D 45/00 - Commande électrique non prévue dans les groupes
• F02P 17/12 - Test des caractéristiques de l'étincelle, de la tension ou du courant d'allumage

Abrégé

An ignition coil for an internal combustion engine is provided which saves space, supplies sufficient secondary energy to a spark plug, and satisfactorily ignites an air-fuel mixture. The present invention is provided with: a first coil (10) provided with a primary coil (11) to which a direct-current voltage is applied from an external unit, a switch element (13) which, in accordance with an ignition signal from an ECU (3), allows or blocks the passage of a first primary current flowing to the primary coil (11), and a secondary coil (12) which generates a first secondary voltage in accordance with whether the passage of the first primary current is allowed or blocked; a second coil (20) provided with a primary coil (21) to which a direct-current voltage is applied from the external unit, a switch element (23) which, in accordance with an ignition signal from the ECU (3), allows or blocks the passage of a second primary current flowing to the primary coil (21), and a secondary coil (22) which generates a second secondary voltage in accordance with whether the passage of the second primary current is allowed or blocked; and high-voltage wiring (30) which connects the secondary coils (12, 22) in series. A spark plug (2) is connected to the secondary coils (12, 22) which are connected in series.

Classes IPC  ?

• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire
• F02P 15/00 - Allumage par étincelle électrique ayant des caractéristiques non couvertes dans les groupes ou présentant un intérêt autre que celui visé par ces groupes

Abrégé

Provided is an ignition coil for an internal combustion engine that is capable of continuing discharge even if secondary current wiring is disconnected or a current detection resistor is disconnected. A secondary current detection resistor (51) that detects secondary current flowing to a secondary circuit that comprises a secondary coil (12) and an ignition plug (50) is disposed externally. Provided are the following: a high-pressure diode (14) that is connected to one end of the secondary coil (12) and that establishes the direction in which secondary current flows; and a Zener diode (15) that is connected to the connection point between the secondary current detection resistor (51) and the high-voltage diode (14) so as to have polarity opposite to that of the high-voltage diode (14). When a breakdown occurs in which the secondary current flowing to the secondary current detection resistor (51) is cut off or suppressed, the Zener diode (15) forms a secondary current path leading current flowing through the high-voltage diode (14) to the ignition plug (50) by using the avalanche breakdown phenomenon, and causes the ignition plug (50) to produce a discharge spark (50).

Classes IPC  ?

• F02P 3/05 - Schéma de montage des circuits pour la commande de l'intensité du courant dans la bobine d'induction
• F02P 3/04 - Schéma de montage des circuits
• F02P 3/055 - Schéma de montage des circuits avec des moyens de protection pour prévenir des dégâts dans le circuit ou la bobine d'induction
• F02P 17/12 - Test des caractéristiques de l'étincelle, de la tension ou du courant d'allumage

Abrégé

Provided is an ignition device for an internal combustion engine in which an ignition coil or a circuit device including a switching element is prevented from overheating by a simple circuit configuration. When a switching element (64) enters a conductive state in accordance with an ignition signal inputted from an external source and a long-conduction detection circuit (40) detects a long conduction time that is equal to or greater than a prescribed time, a discharge current is outputted from a soft-off capacitor (52), the switching element (64) is controlled in accordance with the discharge current channeled to a soft-off resistor (53), and the switching element (64) is gradually transitioned from the conductive state to a cut-off state so that secondary high voltage is not produced in an ignition coil (61).

Classes IPC  ?

• F02P 3/045 - Schéma de montage des circuits pour la commande du temps de fermeture ou d'ouverture
• F02P 3/04 - Schéma de montage des circuits
• F02P 3/055 - Schéma de montage des circuits avec des moyens de protection pour prévenir des dégâts dans le circuit ou la bobine d'induction
• F02P 11/00 - Dispositifs de sécurité de l'allumage par étincelle électrique non prévus ailleurs

Abrégé

Provided is an igniter for internal combustion engines that detects secondary current in an ignition coil that is disposed in cylinders in a simple circuit configuration. An igniter for internal combustion engines, which has ignition coil units (11-14) and an overlapping discharge unit (10) that causes the ignition coil units (11-14) to perform ignition operation, is characterized in that the ignition coil units (11-14) each comprise an ignition coil (21) that induces a discharge voltage for generating a discharge spark in a spark plug (30), a switch (22) that generates, at a desired time, the discharge voltage in the secondary winding of the ignition coil (21) by turning on or off the current flowing to the primary winding of the ignition coil (21), and a high voltage diode (24) that restricts the direction of the current flowing to the secondary winding of the ignition coil (21), and in that the overlapping discharge unit (10) comprises a single secondary current detecting resistance (32) that is connected to the high voltage diodes (24) in the ignition coil units (11-14) and that detects the secondary current flowing to the high voltage diode (24) from the spark plug (30) via the secondary winding.

Classes IPC  ?

• F02P 17/12 - Test des caractéristiques de l'étincelle, de la tension ou du courant d'allumage
• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire
• F02P 11/00 - Dispositifs de sécurité de l'allumage par étincelle électrique non prévus ailleurs

Abrégé

The present invention provides an ignition apparatus for an internal combustion engine that performs superimposed discharging with a circuit arrangement of reduced cost and accurately detects an ion current in each cylinder. A superimposed discharging control device (2) is arranged such that a switch component (31) connected to an ignition coil unit (11), for example, to which a significant ignition signal is input is closed to apply the output voltage of a first circuit (25a) of a voltage-doubler rectifying circuit to the ignition coil unit (11). When a discharging voltage is generated across an ignition coil (51) of the ignition coil unit (11), a high voltage generated by a second circuit (25b) of the voltage-doubler rectifying circuit is superimposed on the discharging voltage, causing an ignition plug (5) to perform superimposed discharging. After the superimposed discharging has been carried out for a predetermined period, the switch component (31) is opened to break the circuit connection between the superimposed discharging control device (2) and the ignition coil unit (11), and an ion current detecting circuit (56) of the ignition coil unit (11) applies an ion current detecting voltage through the secondary winding of the ignition coil (51) to the ignition plug (5) to detect an ion current.

Classes IPC  ?

• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire

Abrégé

Provided is a highly safe ignition device for an internal combustion engine with which an overcurrent can be interrupted quickly when an igniter error occurs, thereby preventing abnormal heat generation due to an overcurrent caused by factors such as short-circuits between ignition coil windings. When an igniter error state wherein an overcurrent flows from a primary winding (1a) of an ignition coil (1) to the power transistor (31) of an igniter (3) occurs, an overcurrent determination comparator (43) of an overcurrent detection circuit (4) turns on, thereby turning on a transistor (44) used for bypass circuit operation and provided part way through a bypass circuit that runs to an overcurrent fusing element (13) without passing through the ignition coil (1) and the igniter (3). The bypass circuit closes, a circuit-interrupting current exceeding the rated current flows in the overcurrent fusing element (13), fusing occurs, and the supply of electricity from a vehicle battery (11) to the ignition coil (1) is blocked.

Classes IPC  ?

• F02P 3/055 - Schéma de montage des circuits avec des moyens de protection pour prévenir des dégâts dans le circuit ou la bobine d'induction

Abrégé

Provided is an ignition device for an internal combustion engine which, by means of an overlapping discharge, maintains a discharge spark generated by a capacitive discharge ignition circuit so as to achieve a suitable discharge time. An overlap time control unit (11) operates a DC-AC booster circuit (10) in response to an ignition signal from the outside, and a discharge current from a capacitive discharge circuit (12) is output to a primary coil (22) with a timing indicated in the ignition signal, thereby generating a discharge spark in a spark plug (5) connected to a secondary coil (23). A direct-current high voltage generated by a voltage-doubler circuit (20) is output to the secondary coil (23) and overlaps the high voltage generated by the discharge current from the capacitive discharge circuit (12), thereby maintaining the discharge spark generated by the spark plug (5).

Classes IPC  ?

• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire
• F02P 3/08 - Schéma de montage des circuits
• F02P 17/12 - Test des caractéristiques de l'étincelle, de la tension ou du courant d'allumage

Abrégé

Provided is an ignition device for an internal combustion engine in which a secondary voltage generated during conduction of a primary current is suppressed, and an ion current is detected to control overlapping discharge. When a primary current is conducted to an ignition coil to generate a first secondary voltage, an overlapping time controller (40a) reduces the first secondary voltage by controlling and superimposing a DC-AC booster circuit (10a) and a voltage doubler circuit, and outputs, to a secondary coil, a first high voltage for preventing a discharge spark from occurring in a spark plug (60). When the primary current of the ignition coil is blocked and a second secondary voltage is generated, the overlapping time controller (40a) controls the DC-AC booster circuit (10a) and the voltage doubler circuit, superimposes the circuits with the second secondary voltage, and outputs, to a secondary coil, a second high voltage for inducing overlapping discharge in the spark plug (60).

Classes IPC  ?

• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire
• F02P 17/12 - Test des caractéristiques de l'étincelle, de la tension ou du courant d'allumage

Abrégé

Provided is an igniter for internal combustion engines that improves combustion efficiency and suppresses power consumption by detecting an ion current, recognizing the combustion state of an internal combustion engine, and performing overlapping discharge in accordance with this combustion state. An igniter for internal combustion engines comprises a ion current resistance (150) that is connected to both ends of a high voltage diode (50) and does not create a short circuit for an output point of a voltage doubler circuit (20), and that has a resistance that does not interfere with detection operations of an ion current detection circuit (100), wherein the ion current detection circuit (100), after the overlapping discharge ends, detects an ion current by applying, to a spark plug (60) via a secondary coil (32) and the ion current resistance (150), a voltage for ion current detection having a polarity opposite to the voltage output from the secondary coil (32) and the voltage doubler circuit (20).

Classes IPC  ?

• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire
• F02P 17/12 - Test des caractéristiques de l'étincelle, de la tension ou du courant d'allumage

Abrégé

The purpose of the present invention is to provide an igniter for internal combustion engines, in which a superposed discharge time is set in accordance with the operating condition of an internal combustion engine and a superposed discharge is performed by a spark plug, such that combustion efficiency is improved. A superposed time controller (40) blocks a first current of an ignition coil (30) by controlling the action of a switch transistor (33) at the timing indicated by an energization signal of an ignition signal input from an ECU (70), generates a discharge spark by supplying generated discharge voltage to a spark plug (60), generates a high voltage by driving a booster circuit (10, 20) in response to a superposed discharge period signal of the ignition signal, and maintains the discharge spark by supplying the high voltage to the spark plug (60) until the period indicated by the superposed discharge period signal ends.

Classes IPC  ?

• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire

Abrégé

Provided is an ignition device for an internal combustion engine for quickly blocking overcurrents when an igniter is abnormal, and preventing abnormal heat generation due to overcurrents caused by short circuiting or the like between ignition coil wires, the ignition device for an internal combustion engine being highly safe and capable of alerting of igniter abnormalities. When an overcurrent flows from an ignition coil (1) to an igniter (3), an abnormal state determination is performed by an igniter abnormality determination unit (6) comprising an overcurrent detection means (4) and an overcurrent conduction time observation means (5), and when there is determined to be an abnormality, a bypass switching signal is continually outputted to a switching element (8) for only as long as is necessary, a bypass circuit (7) running from an irreversible safety circuit (13) to GND without passing through the ignition coil (1) is caused to close, a current exceeding the rated current is flowed to the safety circuit (13) to cause the circuit to fuse, power supply from a vehicle battery (11) to the ignition coil (1) is blocked, and external output of an igniter abnormality notification signal from a bypass confirmation terminal (93) of a bypass abnormality notification means (9) is enabled, the signal indicating that the bypass circuit (7) has been made to function.

Classes IPC  ?

• F02P 3/055 - Schéma de montage des circuits avec des moyens de protection pour prévenir des dégâts dans le circuit ou la bobine d'induction
• F02P 3/04 - Schéma de montage des circuits

Abrégé

Provided is a highly safe ignition device for an internal combustion engine whereby overcurrents can be quickly blocked when abnormalities occur in the igniter, preventing abnormal heat generation caused by overcurrents due to, e.g., short-circuiting between ignition coil windings. When an overcurrent flows from a primary winding (1a) of an ignition coil (1) through a power transistor (31) of an igniter (3) for longer than a permissible current conduction time duration, a first switching element (72) of a protective device (7) turns on, a second switching element (73) turns off, and a bypass switching element (6) turns on, whereby a bypass circuit (5) extending from a safety circuit (13) to GND without passing through the ignition coil (1) is closed, the first switching element (72) is kept in an on state by a power feed from a first switch activating voltage supply line (75), and the bypass circuit (5) is prevented from opening before a blade fuse (12) or the safety circuit (13) actuates.

Classes IPC  ?

• F02P 3/055 - Schéma de montage des circuits avec des moyens de protection pour prévenir des dégâts dans le circuit ou la bobine d'induction
• F02P 3/04 - Schéma de montage des circuits

Abrégé

Provided is an ignition device that is for an internal combustion engine and that, when performing overlapping discharging, prevents misfiring by reliably supplying a high voltage to an ignition plug. When an ignition signal has transitioned from a signal level indicating an off state to a signal level indicating an on state, an overlapping time control unit (40) drives a step-up circuit (10, 20), generating a high voltage at a first level at which discharge current does not flow to the ignition plug (60), when the ignition signal has transitioned from a signal level indicating an on state to a signal level indicating an off state, the overlapping time control unit (40) controls the step-up circuit (10, 20) that is generating a high voltage at the first level, causing the generation of a high voltage at a second level that maintains a discharge spark at the ignition plug (60), and supplying to the ignition plug (60) the high voltage at the second level superimposed on the discharge voltage generated by an ignition coil (30) when the ignition signal has transitioned from on to off.

Classes IPC  ?

• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire

Abrégé

Provided is an overlapping discharge type ignition device for an internal combustion engine that allows the cost to be reduced, and the installation space to be reduced at the same time. The ignition device is equipped with a DC-AC booster circuit (32) for generating an alternating-current voltage from a direct-current voltage and an overlap time control unit (31) for controlling operations of the DC-AC booster circuit (32), each ignition coil unit (11 through 14) includes an ignition coil (22) that receives an external ignition signal and outputs a discharge voltage by using a voltage (VB) when the ignition signal is significant and a voltage-doubler circuit (21) that generates a discharge voltage by using the alternating-current voltage output from the DC-AC booster circuit (32), the overlap time control unit (31) supplies the alternating-current voltage from the DC-AC booster circuit (32) to the voltage-doubler circuit (21) until a predetermined amount of time passes when the ignition signal is significant, overlaps the discharge voltage output from the ignition coil (22) with the discharge voltage output from the voltage-doubler circuit (21), and supplies the resulting voltage to a spark plug (30).

Classes IPC  ?

• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire

Abrégé

Provided is an overlap-discharge-type internal-combustion-engine ignition device with which cost is suppressed by reducing the number of high-voltage wirings and for which the installation space can be reduced. An overlap time control unit (20a) inputs ignition signals from outside to respectively corresponding ignition coil units (11a-14a), and when one of the ignition signals becomes significant, a first alternating voltage is supplied during the lapse of a predetermined time from a DC-AC step-up drive circuit (21) to the ignition coil unit corresponding to the ignition signal that has become significant. In the ignition coil unit corresponding to the ignition signal that has become significant, a voltage-doubler circuit (35) generates a high voltage by employing a second alternating voltage increased in voltage by a step-up transformer (34) to which the first alternating voltage is supplied, and the high voltage is overlapped with a discharge voltage output from an ignition coil (31) and is supplied to an ignition plug (22).

Classes IPC  ?

• F02P 3/00 - Autres systèmes d'allumage par étincelle électrique caractérisés par le type de production ou de stockage de l'énergie nécessaire

Abrégé

Provided is a highly safe ignition device for an internal combustion engine, with which an overcurrent is quickly interrupted when an igniter error occurs, thereby preventing the abnormal generation of heat due to an overcurrent caused by a short-circuit between ignition coil windings, for example. When an overcurrent flows from an ignition coil (1) to an igniter (3), an overcurrent detection comparator (42) of an overcurrent detection means (4) turns on and a time-keeping condenser (51) of an overcurrent energization time monitoring means (5) is energized. When a prescribed charge has accumulated, a comparator (52) used to determine an allowable energization time turns on, a bypass-switching signal is output, the bypass-switching signal output is maintained with a discharge characteristic adjusted by means of the time-keeping condenser (51) and a condenser discharge time adjustment resistor (53), and a switching element (6) is maintained in the closed state, during which time a bypass circuit that runs from an irreversible safety circuit (13) to a GND without passing through the ignition coil (1) remains closed, a current exceeding the rated current flows in the safety circuit, (13) and the safety circuit melts down, thereby preventing current from being supplied from a vehicle battery (11) to the ignition coil (1).

Classes IPC  ?

• F02P 3/055 - Schéma de montage des circuits avec des moyens de protection pour prévenir des dégâts dans le circuit ou la bobine d'induction

Abrégé

Provided is a highly safe ignition device for an internal combustion engine whereby overcurrent can be quickly blocked when abnormalities occur in the igniter, preventing abnormal heat generation caused by overcurrent due to short-circuiting between ignition coil windings, etc. When an overcurrent flows from a primary winding (1a) of an ignition coil (1) through a power transistor (31) of an igniter (3), an overcurrent detection comparator (42) in an overcurrent detection means (4) turns on; and when the overcurrent detected state exceeds a permissible time duration, a permissible charge conductance time determination comparator (52) in an overcurrent conduction time observation means (5) turns on, a switching element (6), which is provided to a bypass circuit extending from a safety circuit (13) to GND without passing through the ignition coil (1), is switched from open to closed, the bypass circuit closes, a current exceeding the rated current flows to and fuses the safety circuit (13), and the supply of electricity from a vehicle battery (11) to the ignition coil (1) is inhibited.

Classes IPC  ?

• F02P 3/055 - Schéma de montage des circuits avec des moyens de protection pour prévenir des dégâts dans le circuit ou la bobine d'induction

Abrégé

Provided is a discharge-type ignition device for an internal combustion engine with which a low cost and a reduced size can be achieved, and which can be installed in a narrow mounting space, and with which it is possible to maintain the supply of overlapping current necessary for a stable discharge. An ignition device for an internal combustion engine, with which a discharge breakdown is produced in the discharge gap (g) of an ignition plug (2) and a discharge current flows by means of an ignition coil (1) that is operated on the basis of an ignition signal, is equipped with an overlapping discharge function. The configuration is such that an overlap time control circuit (6) causes a DC-AC booster circuit (3) to operate, and alternating current for generating an overlapping voltage is supplied to a multistage voltage-doubling rectifier circuit (4), and the obtained direct-current high voltage is overlapped with the same polarity with the induction voltage of a secondary coil (1b). The charge voltage to a discharge electrode is detected by an overlapping current detection/comparison circuit (8), and compared with an overlapping current set value. If the detected value for the overlapping current is lower than the set value, the value for the wave height of the alternating current from the DC-AC booster circuit (3) for generating the overlapping voltage is raised, and if the detected value is higher than the set value, the value for the wave height of the alternating current from the DC-AC booster circuit (3) for generating the charge voltage is lowered, thereby bringing the detected value for the overlapping current close to the set value.

Classes IPC  ?

• F02P 3/04 - Schéma de montage des circuits
• F02P 15/00 - Allumage par étincelle électrique ayant des caractéristiques non couvertes dans les groupes ou présentant un intérêt autre que celui visé par ces groupes