EP0046092B1 - Electronic device for controlling the ignition of an internal-combustion engine - Google Patents

Electronic device for controlling the ignition of an internal-combustion engine Download PDF

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Publication number
EP0046092B1
EP0046092B1 EP19810400964 EP81400964A EP0046092B1 EP 0046092 B1 EP0046092 B1 EP 0046092B1 EP 19810400964 EP19810400964 EP 19810400964 EP 81400964 A EP81400964 A EP 81400964A EP 0046092 B1 EP0046092 B1 EP 0046092B1
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EP
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Prior art keywords
resistor
circuit
capacitor
input
ignition
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EP19810400964
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German (de)
French (fr)
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EP0046092A1 (en
Inventor
Jean Marie Pierret
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Ducellier et Cie
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Ducellier et Cie
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    • 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
    • F02P7/00—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices
    • F02P7/06—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of circuit-makers or -breakers, or pick-up devices adapted to sense particular points of the timing cycle
    • F02P7/067—Electromagnetic pick-up devices, e.g. providing induced current in a coil
    • 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
    • F02P3/04—Layout of circuits
    • F02P3/045—Layout of circuits for control of the dwell or anti dwell time
    • F02P3/0453—Opening or closing the primary coil circuit with semiconductor devices

Definitions

  • the invention relates to an electronic device for controlling the ignition of an internal combustion engine, in particular for motor vehicles, device comprising an element for comparing a voltage value, an ignition coil comprising a primary winding connected in series with a electronic switch, a secondary winding connected consecutively to the spark plugs selected by an ignition distributor, resistive and capacitive external elements capable of ensuring the operation of a monolithic circuit enabling a constant energy spark to be obtained at spark plug electrodes.
  • Such a monolithic circuit known from FR-A-2416357 is associated with a magnetic generator of alternating ignition trigger signals.
  • This magnetic generator consists of a rotor driven in rotation by the distributor shaft in which is housed this magnetic generator, which rotor has at its periphery polar teeth folded parallel to the longitudinal direction in the distributor shaft.
  • the stator of said generator comprises a permanent magnet of annular shape and an induced winding arranged concentrically with the shaft.
  • Polar teeth also folded parallel to the shaft are disposed at the periphery of said stator, polar teeth inside which rotate the polar teeth of the rotor so as to generate alternating signals whose amplitude is known to increase with the speed d generator drive.
  • this delivers signals whose amplitude of ⁇ 140 millivolts is attenuated up to an amplitude of ⁇ 70 millivolts, via the voltage divider bridge constituted by the external resistors R8 and R9, to the common point of which is connected the input 6 of the circuit monolithic 5.
  • This voltage divider bridge therefore constitutes an invariable rate attenuator circuit as a function of variations in the rotation speed of the internal combustion engine.
  • the triggering value of the shaping means has been fixed at ⁇ 70 millivolts.
  • the obligation of a very low speed for triggering the ignition sparks means that with the magnetic generator available and at the engine idling speed, i.e. approximately 300 revolutions per minute at the level of the magnetic generator, the duration of passage of the current in the primary winding of the ignition coil reaches 45% of the period T of the signal delivered by the magnetic generator.
  • This duration could be reduced to 30% by modifying the values of the resistors R8, R9, i.e. 15 KSZ for r8 and 5.6 KSt for r R9 instead of 10 KU, but this modification would then cause the production of ignition sparks, during the start-up phase, at a speed approximately twice as high as the value mentioned above, which would not be acceptable.
  • the object of the present invention is to combine the advantages of the two solutions, by eliminating the drawbacks of each of them, that is to say maintaining a triggering of the ignition sparks at a very low engine starting speed and d '' at its idle speed, a duration of current flow in the primary winding, not more than 30% of the period T of the signal delivered by the magnetic generator so as not to cause excessive heating of the switch electronic.
  • the invention relates to a circuit attenuating the amplitude of the signals coming from the magnetic generator, for triggering the ignition signals, which attenuating circuit comprises an element whose impedance varies as a function of the increase in the speed of rotation of the internal combustion engine so as to obtain, at the idling speed of said engine, a predetermined duration of the passage of current in the primary winding of the ignition coil without modification of the starting speed of said engine.
  • said attenuator circuit consists of a first resistor, one of the ends of which is connected to the common point of the input 6 of the monolithic circuit 5 and of the resistor 8, the other end of the resistor being connected to the common point of a second resistor and a capacitor whose other ends are connected to the negative pole of the device.
  • said attenuator circuit consists of a resistor, one of the ends of which is connected to the common point of the input 6 of the monolithic circuit 5 and of the resistor 8, the other end of the resistor being connected to one end of the capacitor whose other end is connected to the negative pole of the device.
  • the electronic ignition control device shown diagrammatically in FIG. 1, comprises a magnetic generator 1, a rotor 2 and an induced winding 3 housed in the case of the ignition distributor 4 rotated by the internal combustion engine, at a speed half that of said engine.
  • the signals delivered by the magnetic generator 1 are transformed into square signals inside the monolithic circuit 5, by shaping means (not shown) comprising two inputs, one of which, input 7, is directly connected at the negative pole of the device, the other input, input 6 being connected to one of the ends of the induced winding 3, by a fixed rate attenuator circuit, signals from the magnetic generator 1, which attenuator circuit is consisting of a voltage divider bridge made up of external resistors 8 and 9 (see figure 1).
  • a feedback circuit (not shown) consisting of transistors and resistors creates hysteresis between inputs 6 and 7 (see figure 5 line A) so as to have a trigger threshold for value shaping means equal to ⁇ 70 millivolts, value centered on the mean line of the positive and negative amplitudes of the signal from the magnetic generator.
  • the shaping means deliver square-shaped signals as shown by line B in FIG. 5.
  • the duration t1 of these signals corresponds to the time of passage of the current in the primary winding 24 of the ignition coil 22, and consequently conditions the energy available at the electrodes of the spark plugs to produce sparks capable of ignite the mixture.
  • the monolithic circuit 5 is connected to external elements comprising the resistors 10, 11, 12, 13, 14, 15 and the capacitors 16, 17, 18 and 19 capable of ensuring its operation from the battery 20.
  • the device is powered up by means of the ignition key 21.
  • the ignition coil 22 comprises a secondary winding 23, connected to the distributor 4, the primary winding 24 is connected, in series, with an electronic switch 25 whose input 26 is connected to the battery 20, by means of the ignition key 21 and resistors 27, 28 whose common point is connected to the output of the monolithic circuit.
  • the input 26 of the electronic switch 25 is biased by a resistor 29.
  • the output of the electronic switch 25 is connected to one of the ends of a comparison element 30, with a reference voltage value VR , the other end of the comparison element is connected to the negative pole of the device.
  • the attenuation circuit, at variable rate, signals from the magnetic generator consists of a first resistor 9a with an ohmic value 3.3 K ⁇ , one of the ends of which is connected to the common point of the input 6 of the monolithic circuit 5 and of the resistor 8, the other end of the resistor 9a being connected to the common point of a second resistor 9b of the ohmic value 6.8 K ⁇ and of a capacitor 50, of 2.2 microfarads, the other ends of the resistor 9b and of the capacitor 50 being connected to the negative pole of the device.
  • the ohmic value of the resistance 8, that is to say 10 KU remains identical to the value provided for in French patent 2416357.
  • said circuit consists of a resistor 51 of ohmic value 5 K ⁇ one end of which is connected to the common point of the input 6 of the monolithic circuit 5 and of the resistor 8, the other end of the resistor 51 being connected to one of the ends of the capacitor 50, the other end of which is connected to the negative pole of the device.
  • the. ohmic value of resistors 8 and 9 is 10 K ⁇ and capacitor 50 has a capacity of 2.2 microfarads.
  • the attenuation circuit consists of a first resistor 52, of ohmic value 50 KU, connected by one of its ends to the common point of resistors 8 and 9, of ohmic value 10 Kn for each of them, the other end of the resistor 52 being connected to the input 6 of the monolithic circuit 5.
  • the attenuator circuit comprises a second resistor 51 a, of ohmic value 50 K ⁇ , connected by one of its ends, to the input 6 of the monolithic circuit 5, and by its other end, to a capacitor 50a , with a value of 0.22 microfarads, which capacitor is connected by its other end to the negative pole of the device.
  • the duration of current flow in the primary winding of the ignition coil is reduced to 30% of the period T of said signals (see Figure 5 line B), at the idle speed of the combustion engine, without changing the starting speed.
  • line A the dotted lines represent the amplitude of the signals coming from the magnetic generator, by a fixed rate of attenuation of 50% as provided for in French patent 2416357.
  • the duration t1 of the passage of current in the primary winding of the ignition coil reaches 45% of the period T of the signals coming from the magnetic generator (see lines A and B). This period would produce excessive heating of the electronic switch 25 constituting the output stage of the device. Consequently, the attenuation circuits of the invention, variable rate attenuation circuits, reduce this duration to 30% ( Figure 5 line B) by the automatic variation of the impedance of the capacitor 50 or 50a depending the increase in the rotation speed of the internal combustion engine.
  • the attenuation rate which is 50% at the starting speed varies progressively to reach a rate of around 70% at the idling speed, the amplitude of the signals coming from the magnetic generator being attenuated as shown in solid lines at line A in Figure 5.
  • the triggering threshold of the shaping means being fixed at ⁇ 70 millivolts, a duration t1 ′ (line C) is thus obtained corresponding to 30% of the period T.
  • resistors 8, 9, 9a have an ohmic value sufficiently low for parasitic currents, which could disturb the operation of the device, to be derived directly to ground.
  • the drawback of the first and second embodiments is that the low ohmic value of the resistors requires the use of a capacitor of 2.2 microfarads, a capacitor whose volume is not always compatible with the dimensions available. to house the device.
  • the third embodiment overcomes this drawback by adding the resistor 52 which allows the use of a 0.22 microfarad capacitor which can easily be accommodated in the volume available.
  • the invention is not limited to the three embodiments described and that it includes all the circuits which, by their equivalence, allow obtaining a variable attenuation rate of the amplitude of the signals from a magnetic generator, so that at the idling speed of the internal combustion engine, the duration of current flow in the primary winding is equal to approximately 30% of the period T of the signals from the magnetic generator , said duration not causing any modification of the engine starting speed.

Description

L'invention concerne un dispositif électronique de commande d'allumage de moteur à combustion interne, notamment pour véhicules automobiles, dispositif comportant un élément de comparaison d'une valeur de tension, une bobine d'allumage comprenant un enroulement primaire connecté en série avec un interrupteur électronique, un enroulement secondaire relié consécutivement aux bougies d'allumage sélectionnées par un distributeur d'allumage, des éléments externes résistifs et capacitifs aptes à assurer le fonctionnement d'un circuit monolithique permettant l'obtention d'une étincelle d'énergie constante aux électrodes des bougies d'allumage.The invention relates to an electronic device for controlling the ignition of an internal combustion engine, in particular for motor vehicles, device comprising an element for comparing a voltage value, an ignition coil comprising a primary winding connected in series with a electronic switch, a secondary winding connected consecutively to the spark plugs selected by an ignition distributor, resistive and capacitive external elements capable of ensuring the operation of a monolithic circuit enabling a constant energy spark to be obtained at spark plug electrodes.

Un tel circuit monolithique connu par FR-A-2416357 est associé à un générateur magnétique de signaux alternatifs de déclenchement de l'allumage.Such a monolithic circuit known from FR-A-2416357 is associated with a magnetic generator of alternating ignition trigger signals.

Ce générateur magnétique est constitué d'un rotor entraîné en rotation par l'arbre du distributeur dans lequel est logé ce générateur magnétique, lequel rotor comporte à sa périphérie des dents polaires rabattues parallèlement au sens longitudinal dans l'arbre du distributeur.This magnetic generator consists of a rotor driven in rotation by the distributor shaft in which is housed this magnetic generator, which rotor has at its periphery polar teeth folded parallel to the longitudinal direction in the distributor shaft.

Le stator dudit générateur comprend, un aimant permanent de forme annulaire et un enroulement induit disposés concentriquement à l'arbre. Des dents polaires également rabattues parallèlement à l'arbre sont disposées à la périphérie dudit stator, dents polaires à l'intérieur desquelles tournent les dents polaires du rotor de manière à générer des signaux alternatifs dont on sait que l'amplitude croît avec la vitesse d'entraînement du générateur.The stator of said generator comprises a permanent magnet of annular shape and an induced winding arranged concentrically with the shaft. Polar teeth also folded parallel to the shaft are disposed at the periphery of said stator, polar teeth inside which rotate the polar teeth of the rotor so as to generate alternating signals whose amplitude is known to increase with the speed d generator drive.

A une vitesse de rotation de 12 tours/minute du moteur, à combustion interne, correspondant à une vitesse de rotation de 6 tours/minute au niveau du distributeur d'allumage, dans lequel est logé le générateur magnétique, celui-ci délivre des signaux dont l'amplitude de ± 140 millivolts est atténuée jusqu'à une amplitude de ±70 millivolts, par l'intermédiaire du pont diviseur de tension constitué par les résistances externes R8 et R9, au point commun desquelles est connectée l'entrée 6 du circuit monolithique 5.At a rotation speed of 12 revolutions / minute of the internal combustion engine, corresponding to a rotation speed of 6 revolutions / minute at the level of the ignition distributor, in which the magnetic generator is housed, this delivers signals whose amplitude of ± 140 millivolts is attenuated up to an amplitude of ± 70 millivolts, via the voltage divider bridge constituted by the external resistors R8 and R9, to the common point of which is connected the input 6 of the circuit monolithic 5.

Ce pont diviseur de tension constitue donc un circuit atténuateur de taux invariable en fonction des variations de la vitesse de rotation du moteur, à combustion interne.This voltage divider bridge therefore constitutes an invariable rate attenuator circuit as a function of variations in the rotation speed of the internal combustion engine.

En conséquence de quoi et de manière à produire des étincelles d'allumage à partir d'une vitesse de rotation du moteur de 12 tours par minute environ, la valeur de déclenchement des moyens de mise en forme a été fixée à ± 70 millivolts.Consequently, and in order to produce ignition sparks from an engine speed of around 12 revolutions per minute, the triggering value of the shaping means has been fixed at ± 70 millivolts.

Cette caractéristique de déclenchement d'étincelles d'allumage à très basse vitesse est nécessaire pour assurer le démarrage du moteur aux températures hivernales rencontrées dans les pays froids et à un degré moindre dans les pays tempérés, la tension de la batterie de bord étant alors basse et le couple résistant du moteur à son maximum, ce qui, en corollaire, entraîne une nette diminution de la vitesse de rotation du démarreur électrique dont sont munis les véhicules automobiles.This characteristic of triggering ignition sparks at very low speed is necessary to ensure that the engine is started at the winter temperatures encountered in cold countries and to a lesser degree in temperate countries, the voltage of the on-board battery then being low. and the resistant torque of the engine to its maximum, which, as a corollary, results in a marked reduction in the speed of rotation of the electric starter with which motor vehicles are provided.

L'obligation d'une très basse vitesse de déclenchement des étincelles d'allumage, pour les raisons exposées ci-dessus, fait que avec le générateur magnétique dont on dispose et à la vitesse de ralenti du moteur, c'est-à-dire environ 300 tours par minute au niveau du générateur magnétique, la durée de passage du courant dans l'enroulement primaire de la bobine d'allumage atteint 45 % de la période T du signal délivré par le générateur magnétique.The obligation of a very low speed for triggering the ignition sparks, for the reasons explained above, means that with the magnetic generator available and at the engine idling speed, i.e. approximately 300 revolutions per minute at the level of the magnetic generator, the duration of passage of the current in the primary winding of the ignition coil reaches 45% of the period T of the signal delivered by the magnetic generator.

Cette durée pourrait être ramenée à 30 % en modifiant les valeurs des résistances R8, R9, c'est-à-dire 15 KSZ pou r R8 et 5,6 KSt pour r R9 au lieu de 10 KU, mais cette modification entraînerait alors la production des étincelles d'allumage, pendant la phase de démarrage, à une vitesse deux fois plus élevée environ que la valeur précédemment citée, ce qui ne serait pas acceptable.This duration could be reduced to 30% by modifying the values of the resistors R8, R9, i.e. 15 KSZ for r8 and 5.6 KSt for r R9 instead of 10 KU, but this modification would then cause the production of ignition sparks, during the start-up phase, at a speed approximately twice as high as the value mentioned above, which would not be acceptable.

Le but de la présente invention est de cumuler les avantages des deux solutions, en éliminant les inconvénients de chacune d'elles c'est-à-dire conserver un déclenchement des étincelles d'allumage à une très basse vitesse de démarrage du moteur et d'avoir à sa vitesse de ralenti, une durée de passage du courant, dans l'enroulement primaire, non supérieure à 30 % de la période T du signal délivré par le générateur magnétique de façon à ne pas provoquer un échauffement excessif de l'interrupteur électronique.The object of the present invention is to combine the advantages of the two solutions, by eliminating the drawbacks of each of them, that is to say maintaining a triggering of the ignition sparks at a very low engine starting speed and d '' at its idle speed, a duration of current flow in the primary winding, not more than 30% of the period T of the signal delivered by the magnetic generator so as not to cause excessive heating of the switch electronic.

L'invention concerne à cet effet un circuit atténuateur de l'amplitude des signaux issus du générateur magnétique, de déclenchement des signaux d'allumage, lequel circuit atténuateur comporte un élément dont l'impédance varie en fonction de l'accroissement de la vitesse de rotation du moteur à combustion interne de manière à obtenir, à la vitesse de ralenti dudit moteur, une durée prédéterminée du.passage du courant dans l'enroulement primaire de la bobine d'allumage sans modification de la vitesse de démarrage dudit moteur. Selon un premier mode de réalisation, ledit circuit atténuateur est constitué d'une première résistance dont l'une des extrémités est connectée au point commun de l'entrée 6 du circuit monolithique 5 et de la résistance 8, l'autre extrémité de la résistance étant reliée au point commun d'une deuxième résistance et d'un condensateur dont les autres extrémités sont connectées au pôle négatif du dispositif.To this end, the invention relates to a circuit attenuating the amplitude of the signals coming from the magnetic generator, for triggering the ignition signals, which attenuating circuit comprises an element whose impedance varies as a function of the increase in the speed of rotation of the internal combustion engine so as to obtain, at the idling speed of said engine, a predetermined duration of the passage of current in the primary winding of the ignition coil without modification of the starting speed of said engine. According to a first embodiment, said attenuator circuit consists of a first resistor, one of the ends of which is connected to the common point of the input 6 of the monolithic circuit 5 and of the resistor 8, the other end of the resistor being connected to the common point of a second resistor and a capacitor whose other ends are connected to the negative pole of the device.

Selon un deuxième mode de réalisation, ledit circuit atténuateur est constitué d'une résistance dont l'une des extrémités est connectée au point commun de l'entrée 6 du circuit monolithique 5 et de la résistance 8, l'autre extrémité de la résistance étant reliée à une des extrémités du condensateur dont l'autre extrémité est reliée au pôle négatif du dispositif.According to a second embodiment, said attenuator circuit consists of a resistor, one of the ends of which is connected to the common point of the input 6 of the monolithic circuit 5 and of the resistor 8, the other end of the resistor being connected to one end of the capacitor whose other end is connected to the negative pole of the device.

Selon un troisième mode de réalisation, ledit circuit atténuateur est constitué d'une première résistance connectée par une de ses extrémités au point commun des résistances R8, R9 et par son autre extrémité à l'entrée 6 du circuit monolithique 5, lequel circuit atténuateur comprend une deuxième résistance reliée par une de ses extrémités à l'entrée 6 et par son autre extrémité à un condensateur dont l'autre extrémité est connectée au pôle négatif du dispositif. La description qui va suivre en regard des dessins annexés, fera mieux comprendre comment l'invention peut être réalisée.

  • La figure 1 est la représentation schématique du dispositif objet du FR-A-2416357.
  • La figure 2 est la représentation schématique du circuit atténuateur selon un premier mode préféré de réalisation de l'invention.
  • La figure 3 est la représentation schématique du circuit atténuateur selon un deuxième mode préféré de réalisation de l'invention.
  • La figure 4 est la représentation schématique du circuit atténuateur selon un troisième mode préféré de réalisation de l'invention.
  • La figure 5 représente le taux d'atténuation de l'amplitude des signaux délivrés par le générateur magnétique.
According to a third embodiment, said attenuator circuit consists of a first resistor connected by one of its ends to the common point of resistors R8, R9 and by its other end to the input 6 of the monolithic circuit 5, which attenuator circuit comprises a second resistor connected by one of its ends to the input 6 and by its other end to a capacitor whose other end is connected to the negative pole of the device. The description which follows with reference to the appended drawings will make it easier to understand how the invention can be implemented.
  • Figure 1 is the schematic representation of the device object of FR-A-2416357.
  • Figure 2 is the schematic representation of the attenuator circuit according to a first preferred embodiment of the invention.
  • Figure 3 is a schematic representation of the attenuator circuit according to a second preferred embodiment of the invention.
  • Figure 4 is a schematic representation of the attenuator circuit according to a third preferred embodiment of the invention.
  • FIG. 5 represents the rate of attenuation of the amplitude of the signals delivered by the magnetic generator.

Le dispositif électronique de commande d'allumage selon le brevet français 2416357, représenté schématiquement par la figure 1, comporte un générateur magnétique 1, un rotor 2 et un enroulement induit 3 logés dans le boîtier du distributeur d'allumage 4 entraîné en rotation par le moteur à combustion interne, à une vitesse moitié de celle dudit moteur.The electronic ignition control device according to French patent 2416357, shown diagrammatically in FIG. 1, comprises a magnetic generator 1, a rotor 2 and an induced winding 3 housed in the case of the ignition distributor 4 rotated by the internal combustion engine, at a speed half that of said engine.

Les signaux délivrés par le générateur magnétique 1, sont transformés en signaux carrés à l'intérieur du circuit monolithique 5, par des moyens de mise en forme (non représentés) comprenant deux entrées dont l'une, l'entrée 7, est reliée directement au pôle négatif du dispositif, l'autre entrée, l'entrée 6 étant reliée à l'une des extrémités de l'enroulement induit 3, par un circuit atténuateur à taux fixe, des signaux issus du générateur magnétique 1, lequel circuit atténuateur est constitué par un pont diviseur de tension composé des résistances externes 8 et 9 (voir figure 1).The signals delivered by the magnetic generator 1 are transformed into square signals inside the monolithic circuit 5, by shaping means (not shown) comprising two inputs, one of which, input 7, is directly connected at the negative pole of the device, the other input, input 6 being connected to one of the ends of the induced winding 3, by a fixed rate attenuator circuit, signals from the magnetic generator 1, which attenuator circuit is consisting of a voltage divider bridge made up of external resistors 8 and 9 (see figure 1).

Un circuit de réaction (non représenté) constitué de transistors et de résistances crée de l'hystérésis entre les entrées 6 et 7 (voir figure 5 ligne A) de manière à disposer d'un seuil de déclenchement des moyens de mise en forme de valeur égale à ± 70 millivolts, valeur centrée sur la ligne moyenne des amplitudes positives et négatives du signal issu du générateur magnétique.A feedback circuit (not shown) consisting of transistors and resistors creates hysteresis between inputs 6 and 7 (see figure 5 line A) so as to have a trigger threshold for value shaping means equal to ± 70 millivolts, value centered on the mean line of the positive and negative amplitudes of the signal from the magnetic generator.

A partir de ce seuil de déclenchement, les moyens de mise en forme délivrent des signaux de forme carrée comme représenté par la ligne B de la figure 5.From this triggering threshold, the shaping means deliver square-shaped signals as shown by line B in FIG. 5.

La durée t1 de ces signaux correspond au temps de passage du courant dans l'enroulement primaire 24 de la bobine d'allumage 22, et conditionne en conséquence, l'énergie disponible aux électrodes des bougies d'allumage pour produire des étincelles capables d'enflammer le mélange.The duration t1 of these signals corresponds to the time of passage of the current in the primary winding 24 of the ignition coil 22, and consequently conditions the energy available at the electrodes of the spark plugs to produce sparks capable of ignite the mixture.

Le circuit monolithique 5 est connecté à des éléments externes comprenant les résistances 10, 11, 12, 13, 14, 15 et les condensateurs 16, 17, 18 et 19 aptes à assurer son fonctionnement à partir de la batterie 20.The monolithic circuit 5 is connected to external elements comprising the resistors 10, 11, 12, 13, 14, 15 and the capacitors 16, 17, 18 and 19 capable of ensuring its operation from the battery 20.

La mise sous tension du dispositif est réalisée par l'intermédiaire de la clé de contact 21.The device is powered up by means of the ignition key 21.

La bobine d'allumage 22 comprend un enroulement secondaire 23, relié au distributeur 4, l'enroulement primaire 24 est connecté, en série, avec un interrupteur électronique 25 dont l'entrée 26 est reliée à la batterie 20, par l'intermédiaire de la clé de contact 21 et des résistances 27, 28 dont le point commun est connecté à la sortie du circuit monolithique.The ignition coil 22 comprises a secondary winding 23, connected to the distributor 4, the primary winding 24 is connected, in series, with an electronic switch 25 whose input 26 is connected to the battery 20, by means of the ignition key 21 and resistors 27, 28 whose common point is connected to the output of the monolithic circuit.

L'entrée 26 de l'interrupteur électronique 25 est polarisée par une résistance 29. La sortie de l'interrupteur électronique 25 est connectée à l'une des extrémités d'un élément de comparaison 30, d'une valeur de tension de référence VR, l'autre extrémité de l'élément de comparaison est reliée au pôle négatif du dispositif.The input 26 of the electronic switch 25 is biased by a resistor 29. The output of the electronic switch 25 is connected to one of the ends of a comparison element 30, with a reference voltage value VR , the other end of the comparison element is connected to the negative pole of the device.

Le point commun de la sortie de l'interrupteur électronique 25 et de l'élément de comparaison 30 est connecté au circuit monolithique 5. Selon l'invention et suivant un premier mode de réalisation représenté par la figure 2, le circuit d'atténuation, à taux variable, des signaux issus du générateur magnétique, est constitué d'une première résistance 9a de valeur ohmique 3,3 KΩ dont l'une des extrémités est connectée au point commun de l'entrée 6 du circuit monolithique 5 et de la résistance 8, l'autre extrémité de la résistance 9a étant reliée au point commun d'une deuxième résistance 9b de la valeur ohmique 6,8 KΩ et d'un condensateur 50, de 2,2 microfarads, les autres extrémités de la résistance 9b et du condensateur 50 étant connectées au pôle négatif du dispositif.The common point of the output of the electronic switch 25 and of the comparison element 30 is connected to the monolithic circuit 5. According to the invention and according to a first embodiment represented by FIG. 2, the attenuation circuit, at variable rate, signals from the magnetic generator, consists of a first resistor 9a with an ohmic value 3.3 KΩ, one of the ends of which is connected to the common point of the input 6 of the monolithic circuit 5 and of the resistor 8, the other end of the resistor 9a being connected to the common point of a second resistor 9b of the ohmic value 6.8 KΩ and of a capacitor 50, of 2.2 microfarads, the other ends of the resistor 9b and of the capacitor 50 being connected to the negative pole of the device.

La valeur ohmique de la résistance 8, c'est-à-dire 10 KU reste identique à la valeur prévue dans le brevet français 2416357. Dans un deuxième mode de réalisation du circuit atténuateur représenté par la figure 3, ledit circuit est constitué d'une résistance 51 de valeur ohmique 5 KΩ dont l'une des extrémités est connectée au point commun de l'entrée 6 du circuit monolithique 5 et de la résistance 8, l'autre extrémité de la résistance 51 étant reliée à une des extrémités du condensateur 50 dont l'autre extrémité est reliée au pôle négatif du dispositif.The ohmic value of the resistance 8, that is to say 10 KU remains identical to the value provided for in French patent 2416357. In a second embodiment of the attenuator circuit represented by FIG. 3, said circuit consists of a resistor 51 of ohmic value 5 KΩ one end of which is connected to the common point of the input 6 of the monolithic circuit 5 and of the resistor 8, the other end of the resistor 51 being connected to one of the ends of the capacitor 50, the other end of which is connected to the negative pole of the device.

Dans ce deuxième mode de réalisation, la. valeur ohmique des résistances 8 et 9 est de 10 KΩ et le condensateur 50 est de capacité 2,2 microfarads.In this second embodiment, the. ohmic value of resistors 8 and 9 is 10 KΩ and capacitor 50 has a capacity of 2.2 microfarads.

Dans un troisième mode de réalisation représenté par la figure 4, le circuit d'atténuation est constitué d'une première résistance 52, de valeur ohmique 50 KU, connectée par une de ses extrémités au point commun des résistances 8 et 9, de valeur ohmique 10 Kn pour chacune d'elles, l'autre extrémité de la résistance 52 étant reliée à l'entrée 6 du circuit monolithique 5.In a third embodiment represented by FIG. 4, the attenuation circuit consists of a first resistor 52, of ohmic value 50 KU, connected by one of its ends to the common point of resistors 8 and 9, of ohmic value 10 Kn for each of them, the other end of the resistor 52 being connected to the input 6 of the monolithic circuit 5.

Dans ce troisième mode de réalisation, le circuit atténuateur comprend une deuxième résistance 51 a, de valeur ohmique 50 KΩ, reliée par une de ses extrémités, à l'entrée 6 du circuit monolithique 5, et par son autre extrémité, à un condensateur 50a, de valeur 0,22 microfarads, lequel condensateur est relié, par son autre extrémité au pôle négatif du dispositif.In this third embodiment, the attenuator circuit comprises a second resistor 51 a, of ohmic value 50 KΩ, connected by one of its ends, to the input 6 of the monolithic circuit 5, and by its other end, to a capacitor 50a , with a value of 0.22 microfarads, which capacitor is connected by its other end to the negative pole of the device.

Avec ces divers modes de réalisation, du circuit d'atténuation de l'amplitude des signaux issus du générateur magnétique, la durée de passage du courant dans l'enroulement primaire de la bobine d'allumage est ramenée à 30 % de la période T desdits signaux (voir figure 5 ligne B), à la vitesse de ralenti du moteur à combustion, sans modification de la vitesse de démarrage.With these various embodiments, of the circuit for attenuating the amplitude of the signals from the magnetic generator, the duration of current flow in the primary winding of the ignition coil is reduced to 30% of the period T of said signals (see Figure 5 line B), at the idle speed of the combustion engine, without changing the starting speed.

Sur la figure 5, ligne A, les traits pointillés représentent l'amplitude des signaux, issus du générateur magnétique, par un taux fixe d'atténuation de 50 % comme prévu dans le brevet français 2416357.In FIG. 5, line A, the dotted lines represent the amplitude of the signals coming from the magnetic generator, by a fixed rate of attenuation of 50% as provided for in French patent 2416357.

A la vitesse de ralenti du moteur, environ 600 tours/minute correspondant à une vitesse de 300 tours/minute au niveau du générateur magnétique, la durée t1 du passage du courant dans l'enroulement primaire de la bobine d'allumage atteint 45 % de la période T des signaux issus du générateur magnétique (voir lignes A et B). Cette durée produirait un échauffement excessif de l'interrupteur électronique 25 constituant l'étage de sortie du dispositif. En conséquence de quoi, les circuits d'atténuation de l'invention, circuits d'atténuation à taux variable, ramènent cette durée à 30% (figure 5 ligne B) par la variation automatique de l'impédance du condensateur 50 ou 50a en fonction de l'accroissement de la vitesse de rotation du moteur à combustion interne.At the engine idling speed, approximately 600 revolutions / minute corresponding to a speed of 300 revolutions / minute at the level of the magnetic generator, the duration t1 of the passage of current in the primary winding of the ignition coil reaches 45% of the period T of the signals coming from the magnetic generator (see lines A and B). This period would produce excessive heating of the electronic switch 25 constituting the output stage of the device. Consequently, the attenuation circuits of the invention, variable rate attenuation circuits, reduce this duration to 30% (Figure 5 line B) by the automatic variation of the impedance of the capacitor 50 or 50a depending the increase in the rotation speed of the internal combustion engine.

Le taux d'atténuation qui est de 50 % à la vitesse de démarrage varie progressivement pour attein- dre un taux d'environ 70 % à la vitesse de ralenti, l'amplitude des signaux issus du générateur magnétique étant atténuée comme représenté en traits pleins à la ligne A de la figure 5.The attenuation rate which is 50% at the starting speed varies progressively to reach a rate of around 70% at the idling speed, the amplitude of the signals coming from the magnetic generator being attenuated as shown in solid lines at line A in Figure 5.

Le seuil de déclenchement des moyens de mise en forme étant fixé à ± 70 millivolts, on obtient ainsi une durée t1' (ligne C) correspondant à 30 % de la période T.The triggering threshold of the shaping means being fixed at ± 70 millivolts, a duration t1 ′ (line C) is thus obtained corresponding to 30% of the period T.

Il est à remarquer que les résistances 8, 9, 9a ont une valeur ohmique suffisamment faible pour que des courants parasites, qui pourraient perturber le fonctionnement du dispositif, soient dérivés directement à la masse.It should be noted that the resistors 8, 9, 9a have an ohmic value sufficiently low for parasitic currents, which could disturb the operation of the device, to be derived directly to ground.

Toutefois, l'inconvénient des premier et deuxième modes de réalisation est que la faible valeur ohmique des résistances nécessite l'emploi d'un condensateur de 2,2 microfarads, condensateur dont le volume n'est pas toujours compatible avec les dimensions dont on dispose pour loger le dispositif.However, the drawback of the first and second embodiments is that the low ohmic value of the resistors requires the use of a capacitor of 2.2 microfarads, a capacitor whose volume is not always compatible with the dimensions available. to house the device.

Le troisième mode de réalisation remédie à cet inconvénient par l'adjonction de la résistance 52 ce qui permet d'utiliser un condensateur de 0,22 microfarads facilement logeable dans le volume dont on dispose.The third embodiment overcomes this drawback by adding the resistor 52 which allows the use of a 0.22 microfarad capacitor which can easily be accommodated in the volume available.

On conçoit bien que l'invention n'est pas limitée aux trois modes de réalisation décrits et qu'elle comprend tous les circuits qui, par leur équivalence, permettent l'obtention d'un taux d'atténuation variable de l'amplitude des signaux issus d'un générateur magnétique, de manière qu'à la vitesse de ralenti du moteur, à combustion interne, la durée de passage du courant dans l'enroulement primaire soit égale à environ 30 % de la période T des signaux issus du générateur magnétique, ladite durée n'entraînant pas de modification de la vitesse de démarrage du moteur.It is well understood that the invention is not limited to the three embodiments described and that it includes all the circuits which, by their equivalence, allow obtaining a variable attenuation rate of the amplitude of the signals from a magnetic generator, so that at the idling speed of the internal combustion engine, the duration of current flow in the primary winding is equal to approximately 30% of the period T of the signals from the magnetic generator , said duration not causing any modification of the engine starting speed.

Claims (4)

1. An electronic ignition control device for an internal combustion engine, particularly for motor vehicles, the device including a voltage value comparison element (30) an ignition coil (22) having a primary winding (24) connected in series to an electronic switch (25), a secondary winding (23) connected consecutively to the spark plugs selected by an ignition distributor (4), external resistor elements (8 to 15), (27 to 29) and capacitor elements (16 to 19) adapted to ensure the operation of a monolithic circuit (5) permitting a constant energy spark to be obtained at the electrodes of the spark plugs, the monolithic circuit (5) including an input (6) connected to a variable rate circuit for attenuation of the amplitude of the alternating signals from the induction winding (3) of a magnetic generator, characterised in that said attenuation circuit constituted by the external resistors (8 and 9) includes a capacitor (50) the impedance of which varies as a function of the speed of revolution of the internal combustion engine, such that at the tick over speed of the engine, passage of the current in the primary winding (24) of the ignition coil (22) is obtained for a predetermined time t1 without changing the starting speed of the internal combustion engine.
2. An attenuator circuit according to Claim 1, characterised in that said circuit is constituted by a first resistor (9a) of which one end is connected to the common point of the input (6) of the monolithic circuit (5) and the resistor (8), the other end of the resistor (9a) being connected to the common point of a second resistor (9b) and a capacitor (50) of which the other ends are connected to the negative pole of the device.
3. An attenuator circuit according to Claim 1, characterised in that said circuit is constituted by a resistor (51) of which one of the ends is connected to the common point of the input (6) of the monolithic circuit (5) and the resistor (8), the other end of the resistor (51) being connected to one of the ends of the capacitor (50) of which the other end is connected to the negative pole of the device.
4. An attenuator circuit according to Claim 1, characterised in that said circuit is constituted by a first resistor (52) connected by one of its ends to the common point of the resistors (8 and 9) and by its other end to the input (6) of the monolithic circuit (5) which attenuator circuit includes a second resistor (51a) connected by one of its ends to the input (6) of the monolithic circuit (5) and by its other end to a capacitor (50a) of which the other end is connected to the negative pole of the device.
EP19810400964 1980-08-13 1981-06-17 Electronic device for controlling the ignition of an internal-combustion engine Expired EP0046092B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8017811 1980-08-13
FR8017811A FR2488741A2 (en) 1980-08-13 1980-08-13 ELECTRONIC IGNITION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINES

Publications (2)

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EP0046092A1 EP0046092A1 (en) 1982-02-17
EP0046092B1 true EP0046092B1 (en) 1984-03-21

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Application Number Title Priority Date Filing Date
EP19810400964 Expired EP0046092B1 (en) 1980-08-13 1981-06-17 Electronic device for controlling the ignition of an internal-combustion engine

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EP (1) EP0046092B1 (en)
DE (1) DE3162786D1 (en)
ES (1) ES8206105A1 (en)
FR (1) FR2488741A2 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3605713A (en) * 1970-05-18 1971-09-20 Gen Motors Corp Internal combustion engine ignition system
DE2649733A1 (en) * 1976-10-29 1978-05-03 Bosch Gmbh Robert IC engine ignition with engine dependent signal generator - has additional capacitor whose charge is variable via emitter-collector paths of input and output transistors
DE2729505C2 (en) * 1977-06-30 1985-05-23 Robert Bosch Gmbh, 7000 Stuttgart Ignition device for internal combustion engines
FR2416357A1 (en) * 1978-02-02 1979-08-31 Ducellier & Cie Automotive IC engine electronic ignition system - has signal shapers with two complementary inputs and transistors, each with multiple collector (NL 6.8.79)

Also Published As

Publication number Publication date
FR2488741B2 (en) 1984-01-06
ES504325A0 (en) 1982-08-16
FR2488741A2 (en) 1982-02-19
ES8206105A1 (en) 1982-08-16
DE3162786D1 (en) 1984-04-26
EP0046092A1 (en) 1982-02-17

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