EP0255423A1 - Safety in electronic ignition with static distributor - Google Patents
Safety in electronic ignition with static distributor Download PDFInfo
- Publication number
- EP0255423A1 EP0255423A1 EP87401653A EP87401653A EP0255423A1 EP 0255423 A1 EP0255423 A1 EP 0255423A1 EP 87401653 A EP87401653 A EP 87401653A EP 87401653 A EP87401653 A EP 87401653A EP 0255423 A1 EP0255423 A1 EP 0255423A1
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- EP
- European Patent Office
- Prior art keywords
- current
- ignition
- coil
- microcomputer
- circuit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- F02P3/00—Other installations
- F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
- F02P3/04—Layout of circuits
- F02P3/05—Layout of circuits for control of the magnitude of the current in the ignition coil
- F02P3/051—Opening or closing the primary coil circuit with semiconductor devices
- F02P3/053—Opening or closing the primary coil circuit with semiconductor devices using digital techniques
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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
- F02P11/00—Safety means for electric spark ignition, not otherwise provided for
- F02P11/02—Preventing damage to engines or engine-driven gearing
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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
- F02P3/00—Other installations
- F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
- F02P3/04—Layout of circuits
- F02P3/055—Layout of circuits with protective means to prevent damage to the circuit, e.g. semiconductor devices or the ignition coil
- F02P3/0552—Opening or closing the primary coil circuit with semiconductor devices
- F02P3/0554—Opening or closing the primary coil circuit with semiconductor devices using digital techniques
Definitions
- the present invention relates to an electronic ignition device for a spark ignition engine, of the static distribution type, and in particular relates to a device for static ignition safety in the event of failure of the ignition control system.
- the invention finds particular application in the automotive industry.
- Static distribution ignition devices are already known, piloted by a control system capable of giving the orders for passing and breaking the current in the ignition coils such as a microprocessor.
- control commands are linked to the proper functioning of said control member and, consequently, the failure of the microcomputer can cause sudden power cuts, thus creating erratic sparks at the spark plug in the engine cycle, for example in the admission cycle.
- the object of the present invention is to remedy these drawbacks by proposing a security device preventing the appearance of erratic sparks in the event of a microcomputer failure.
- the invention proposes a device capable of controlling the coil current, in particular in the event of a malfunction of the control system and more precisely of acting on a reference voltage which conditions the level of current regulation of the Darlington circuit d 'ignition.
- the present invention provides an electronic ignition device for a spark ignition engine, of the static distribution type, in which the orders for passing and breaking the current in the ignition coil (s) are given by a control system.
- a control system such as a microcomputer, which includes safety means ensuring slow suppression of the coil current without sparks under the action of a signal appearing in the event of a failure of the control system.
- the security means comprise means able to maintain the state of the command at level 1 during the failure signal, whatever this state is before the failure signal.
- the electronic ignition device comprises a control system 1, such as a microcomputer, an ignition control circuit CI1 and a circuit safety CI2.
- the input of the ignition control circuit CI1 is connected to the output port P1 of the control system 1 and its output is connected to the base of a Darlington ignition circuit shown in FIG. 1 by a transistor T1.
- the collector of transistor T1 is connected to an ignition coil L1 and its emitter to an output resistor R2.
- the coil L1 is connected to a circuit for producing the ignition spark E.
- the ignition control circuit CI1 there is a comparator circuit OP1, a first input of which is constituted by the emitter of the transistor T1 and a second input is constituted by the output of the safety circuit CI2 (point A, figure 1).
- the output of said comparator circuit OP1 is connected to a point P.
- a current generator G3 is also connected to the point P by a switch C3.
- the common point P is connected to the base of the transistor T1.
- a resistor R1 is mounted in bypass of the output port P1 of the control system 1, between a predetermined supply voltage, which can be 5 volts, and the control of the switch C3.
- the input of the safety circuit CI2 is connected to the RESET output of the control system 1 and its output is connected to point A and also to an input of the comparator circuit OP1 of the aforementioned ignition control circuit CI1.
- the safety circuit CI2 includes a comparator circuit OP2, one input of which is connected to a reference voltage (point B) via a switch C4 and the other of which is connected to point A.
- the output of said comparator OP2 is connected to the base of a transistor T2 whose collector is connected to a power source of 5 volts for example, and the emitter is connected to a resistor R and constitutes the output of the safety circuit CI2.
- a CDI charge capacitor is connected in bypass at the output of said comparator OP2 and comprises a charge circuit comprising a constant current generator G1, connected to said CDI capacitor by switch means C1 forming part of the comparator circuit in the manner shown in FIG. 1 and a discharge circuit of said capacitor CDI comprising a constant current generator G2 connected to said capacitor by switching means C2 of the circuit OP2.
- Switch C4 is controlled by the RESET output of control system 1 via an inverter 3 (point C), or by an external module 2, also ensuring RESET of the system.
- the comparator circuit OP1 is composed of the tranistors Q64 to Q70, the output stage of which comprises a transistor Q72, the base of which is connected to the collector of the transistor Q67, and the emitter has a series of three PNP type Q77 transistors connected in parallel.
- the constant current generator G3 is produced by means of a series of three PNP type transistors Q76 mounted in parallel with one another and in series between a predetermined supply voltage and the output stage of the comparator OP1, and three others NPN Q73 to Q75 transistors connected in parallel and their emitters are connected to the emitter of a Q71 NPN transistor.
- the transistor Q71 is mounted as a switch corresponding to the switch C3 in FIG. 1.
- the output of the module CI1 is produced by the transistor Q78 connected by its collector to the predetermined supply voltage which can be 5 volts, represented in point 9, and by its emitter at the base of the ignition transistor T1 which is connected to point 8 in FIG. 3.
- the comparator circuit OP1 compares the existing potentials with the respective bases of the transistors Q69 and Q70 which correspond respectively to the potential of point A, c that is to say at the output of the module CI2 of FIG. 1, and at the potential of point 5, that is to say the potential existing in the coil circuit proportional to the coil current at the terminals of the output resistance R2.
- the transistors Q64 to Q78 making up the aforementioned CI1 ignition control circuit are suitably biased by resistors R32 to R39 and R52 R53 of appropriate value.
- the circuit shown in FIG. 4 constitutes the safety circuit part CI2 of FIG. 1.
- the comparator circuit OP2 is composed of two transistors Q47 and Q48 mounted symmetrically and whose transmitters are connected.
- Current sources constant G1 and G2 are respectively constituted by three transistors Q40 to Q42 of the NPN type connected in parallel and two transistors Q51, Q52 having their common base.
- the comparator circuit OP2 is controlled by means of the two transistors Q49 and Q50 of the PNP type constituting the aforementioned switches C2 and C1 respectively, the base of the transistor Q49 being connected to point B in FIG. 1.
- the control switch C4 is produced by the association of transistors Q43, Q44, Q54 and Q55.
- the base of transistor Q44 is connected to point C in FIG. 1.
- the transistor Q53 of the PNP type constitutes the transistor T2 of FIG. 1, the base of which is connected to the charge capacitor CDI.
- the transistors Q40 to Q55 making up the safety circuit CI2 are suitably biased by means of resistors R24 to R30 of appropriate value.
- module CI2 is indicated by point A, connected to the base of transistor Q50.
- the electronic engine ignition is controlled by the control system 1 to the microprocessor by means of the control output port P1.
- the output port P1 When the system is powered up, the output port P1 is at the high level, forcing the pint E1 to 1 as it appears in part I of the diagram diagram of the signals of FIG. 2.
- the RESET is at the low level
- the switch C4 is open, which causes the closing of C2.
- the voltage across the capacitor remains zero.
- the input E1 being at the high level, the switch C3 closes but all the current coming from the constant current source G3 is deflected in the comparator circuit OP1.
- the coil L1 does not charge with current.
- RESET has gone to the high level as it clearly appears in part II of FIG. 2.
- the microcomputer controls the input E1 at the low level thus opening the switch C3, while switches C4 and C1 close and switch C2 opens.
- the constant current generator G1 therefore supplies a current to the charge capacitor CDI whose voltage across its terminals increases until it reaches a reference charge value VREF; simultaneously the voltage at point A increases.
- the C3 switch being open, the current charging of the coil cannot be carried out.
- the switch C3 closes, thus allowing the passage of a current at the base of the transistor controlling the ignition T1- (case III of FIG. 2 ).
- the transistor Q71 constituting C3 is conductive allowing the flow of a current through the transistors Q74 and the resistor R37 which makes the transistors Q76 and Q78 conductive.
- the voltage at point A has the value VREF.
- the comparator circuit OP1 will compare the voltage at point A and the voltage in the coil circuit at the terminals of R2. The output of said comparator controls the current load of the coil by means of the base of transistor T1. As a result, the coil charges with current approximately until the voltage across R2 is equal to the voltage at point A, that is to say VREF.
- the failure signal is given either by the microcomputer, in case of voluntary rerouting, or by a module external to the system (module 2 figure 1) or "watchdog".
- This "watchdog” maybe: - or of the digital type, that is to say of the counter type activated by a clock, which when it overflows, activates a RESET. It is sufficient to calibrate the size of the counter and the clock frequency to determine the minimum time interval during which the microcomputer must reset the circuit to zero.
- - or of the analog type that is to say such as a current generator which charges a capacitor. When the voltage level across the capacitor exceeds the reference level detected by a comparator, RESET is actuated. The capacitor is discharged by the "watchdog” pulses. Just calibrate the value of the capacitor, the reference level and the value of the charging current to determine the time interval equivalent to the previous system.
- the advantage of the device according to the present invention lies in the fact that by acting on a reference voltage which can be common to several Darlington ignition assemblies, a single and unique means ensures the slow breaking of the coil current. This cut-off is systematically ensured on each RESET of the microcomputer whether this RESET comes from a command from the microcomputer or from the "watchdog" or even by direct command by an external circuit.
- the invention also presents an interesting economic importance, in particular with regard to its reliability in the field of static distribution: the solutions of the invention associated with the high voltage limitation function of the ignition Darlington have enabled the design of '' an 18-pin analog bipolar integrated circuit which serves as an interface between the microcomputers and two Darlingtons controlling two double ignition coils (4-cylinder engine).
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- General Engineering & Computer Science (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
La présente invention concerne un dispositif d'allumage électronique pour moteur à allumage commandé, du type à distribution statique, et a notamment pour objet un dispositif de sécurité de l'allumage statique en cas de défaillance du sytème de commande de l'allumage.The present invention relates to an electronic ignition device for a spark ignition engine, of the static distribution type, and in particular relates to a device for static ignition safety in the event of failure of the ignition control system.
L'invention trouve notamment application dans l'industrie automobile.The invention finds particular application in the automotive industry.
On connait déjà des dispositifs d'allumage à distribution statique pilotés par un système de commande susceptible de donner les ordres de passage et de coupure du courant dans les bobines d'allumage tel qu'un microprocesseur. Cependant, les ordres de commande sont liés au bon fonctionnement dudit organe de commande et, par conséquent, la défaillance du micro-ordinateur peut provoquer des coupures brusques de courant, créant ainsi des étincelles erratiques à la bougie dans le cycle moteur, par exemple dans le cycle d'admission.Static distribution ignition devices are already known, piloted by a control system capable of giving the orders for passing and breaking the current in the ignition coils such as a microprocessor. However, the control commands are linked to the proper functioning of said control member and, consequently, the failure of the microcomputer can cause sudden power cuts, thus creating erratic sparks at the spark plug in the engine cycle, for example in the admission cycle.
La présente invention a pour objet de remédier à ces inconvénients en proposant un dispositif de sécurité évitant l'apparition d'étincelles erratiques en cas de défaillance du micro-ordinateur.The object of the present invention is to remedy these drawbacks by proposing a security device preventing the appearance of erratic sparks in the event of a microcomputer failure.
Pour ce faire, l'invention propose un dispositif susceptible de contrôler le courant bobine, notamment en cas de mauvais fonctionnement du système de commande et plus précisement d'agir sur une tension de référence qui conditionne le niveau de régulation en courant du montage Darlington d'allumage.To do this, the invention proposes a device capable of controlling the coil current, in particular in the event of a malfunction of the control system and more precisely of acting on a reference voltage which conditions the level of current regulation of the Darlington circuit d 'ignition.
Ainsi, la présent invention prévoit un dispositif d'allumage électronique pour moteur à allumage commandé, du type à distribution statique, dans lequel les ordres de passage et de coupure du courant dans la ou les bobines d'allumage sont donnés par un système de commande tel que micro-ordinateur, qui comporte des moyens de sécurité assurant une suppression lente du courant bobine sans qu'il y ait d'étincelles sous l'action d'un signal apparaissant en cas de défaillance du système de commande.Thus, the present invention provides an electronic ignition device for a spark ignition engine, of the static distribution type, in which the orders for passing and breaking the current in the ignition coil (s) are given by a control system. such as a microcomputer, which includes safety means ensuring slow suppression of the coil current without sparks under the action of a signal appearing in the event of a failure of the control system.
Ainsi, en situation de déroutage du système de commande, un signal de défaillance apparait et commande la suppression lente du courant bobine ce qui permet d'éviter l'apparition d'étincelles indésirables.Thus, in a situation where the control system is diverted, a failure signal appears and commands the slow suppression of the coil current, which avoids the appearance of unwanted sparks.
Selon une caractéristique de l'invention, les moyens de sécurité comportent des moyens aptes à maintenir pendant le signal de défaillance, l'état de la commande au niveau 1, quel que soit cet état avant le signal de défaillance.According to a characteristic of the invention, the security means comprise means able to maintain the state of the command at
L'invention sera mieux comprise, d'autres buts, caractéristiques, détails et avantages de celle-ci apparaîtront plus clairement au cours de la description explicative qui va suivre faite en référence aux dessins schématiques annexés donnés uniquement à titre d'exemple illustrant un mode de réalisation de l'invention, et dans lesquels :
- La figure 1 est une représentation schématique simplifiée du dispositif selon l'invention ;
- La figure 2 est un diagramme synoptique des signaux ;
- La figure 3 représente un mode de réalisation de la partie CI1 de la figure 1 ;
- La figure 4 représente un mode de réalisation de la partie CI2 du schéma de la figure 1.
- Figure 1 is a simplified schematic representation of the device according to the invention;
- Figure 2 is a block diagram of the signals;
- FIG. 3 represents an embodiment of the part CI1 of FIG. 1;
- FIG. 4 represents an embodiment of the part CI2 of the diagram of FIG. 1.
En se réfèrant tout d'abord à la figure 1, le dispositif d'allumage électronique selon la présente invention, comprend un système de commande 1, tel qu'un micro-ordinateur, un circuit de commande de l'allumge CI1 et un circuit de sécuirté CI2. L'entrée du circuit CI1 de commande de l'allumage est reliée au port de sortie P1 du système de commande 1 et sa sortie est reliée à la base d'un montage Darlington d'allumage représenté sur la figure 1 par un transistor T1. Le collecteur du transistor T1 est connecté à une bobine d'allumage L1 et son émetteur, à une résistance de sortie R2. La bobine L1 est reliée a un circuit de production de l'étincelle d'allumage E. Dans le circuit de commande d'allumage CI1, se trouve un circuit comparateur OP1 dont une première entrée est constituée par l'émetteur du transistor T1 et une deuxième entrée est constituée par la sortie du circuit de sécurité CI2 (point A, figure 1). La sortie dudit circuit comparateur OP1 est reliée à un point P. Un générateur de courant G3 est également connecté au point P par un commutateur C3. Le point commun P est relié à la base du transistor T1.Referring first to FIG. 1, the electronic ignition device according to the present invention comprises a
Une résistance R1 est montée en dérivation du port de sortie P1 du système de commande 1, entre une tension d'alimentation prédéterminée, qui peut être de 5 volts, et la commande du commutateur C3.A resistor R1 is mounted in bypass of the output port P1 of the
L'entrée du circuit de sécurité CI2 est reliée à la sortie RESET du système de commande 1 et sa sortie est connectée au point A et aussi à une entrée du circuit comparateur OP1 du circuit de commande d'allumage CI1 précité.The input of the safety circuit CI2 is connected to the RESET output of the
Le circuit de sécurité CI2 comporte un circuit comparateur OP2 dont une entrée est reliée à une tension de réféerence (point B) par l'intermédiaire d'un commutateur C4 et dont l'autre est reliée au point A. La sortie dudit comparateur OP2 est reliée à la base d'un transistor T2 dont le collecteur est relié à une source d'alimentation de 5 volts par exemple, et l'émetteur est relié à une résistance R et constitue la sortie du circuit de sécurité CI2. Un condensateur de charge CDI est connecté en dérivation en sortie dudit comparateur OP2 et comporte un circuit de charge comprenant un générateur de courant constant G1, relié audit condensateur CDI par des moyens commutateurs C1 faisant partie du circuit comparateur à la manière démontrée sur la figure 1 et un circuit de décharge dudit condensateur CDI comprenant un générateur de courant constant G2 relié audit condensateur par des moyens commutateurs C2 du circuit OP2.The safety circuit CI2 includes a comparator circuit OP2, one input of which is connected to a reference voltage (point B) via a switch C4 and the other of which is connected to point A. The output of said comparator OP2 is connected to the base of a transistor T2 whose collector is connected to a power source of 5 volts for example, and the emitter is connected to a resistor R and constitutes the output of the safety circuit CI2. A CDI charge capacitor is connected in bypass at the output of said comparator OP2 and comprises a charge circuit comprising a constant current generator G1, connected to said CDI capacitor by switch means C1 forming part of the comparator circuit in the manner shown in FIG. 1 and a discharge circuit of said capacitor CDI comprising a constant current generator G2 connected to said capacitor by switching means C2 of the circuit OP2.
Le commutateur C4 est commandé par la sortie RESET du système de commadnde 1 par l'intermédiaire d'un inverseur 3 (point C), ou par un module externe 2, assurant également un RESET du système.Switch C4 is controlled by the RESET output of
En se réfèrant à la figure 3, le module CI1 sera décrit plus en détail. Le circuit comparateur OP1 est composé des tranistors Q64 à Q70 dont l'étage de sortie comprend un transistor Q72 dont la base est reliée au collecteur du transistor Q67, et l'émetteur a une série de trois transistors Q77 du type PNP montés en parallèle. Le générateur de courant constant G3 est réalisé au moyen d'une série de trois transistors Q76 du type PNP montés en parallèle entre eux et en série entre une tension d'alimentation prédéterminée et l'étage de sortie du comparateur OP1, et de trois autres transistors du type NPN Q73 à Q75 montés en parallèle et dont leurs émetteurs sont reliés à l'émetteur d'un transistor Q71 du type NPN. Le transistor Q71 est monté en interrupteur correspondant au commutateur C3 de la figure 1. La sortie du module CI1 est réalisée par le transistor Q78 relié par son collecteur à la tension d'alimentation prédéterminée qui peut être de 5 volts, représentée au point 9, et par son émetteur à la base du transistor T1 d'allumage qui est relié au point 8 de la figure 3. Le circuit comparateur OP1 compare les potentiels existants aux bases respectives des transistors Q69 et Q70 qui correspondent respectivement au potentiel du point A, c'est-à-dire en sortie du module CI2 de la figure 1, et au potentiel du point 5, c'est-à-dire le potentiel existant dans le circuit bobine proportionnel au courant bobine aux bornes de la résistance de sortie R2.Referring to Figure 3, the module CI1 will be described in more detail. The comparator circuit OP1 is composed of the tranistors Q64 to Q70, the output stage of which comprises a transistor Q72, the base of which is connected to the collector of the transistor Q67, and the emitter has a series of three PNP type Q77 transistors connected in parallel. The constant current generator G3 is produced by means of a series of three PNP type transistors Q76 mounted in parallel with one another and in series between a predetermined supply voltage and the output stage of the comparator OP1, and three others NPN Q73 to Q75 transistors connected in parallel and their emitters are connected to the emitter of a Q71 NPN transistor. The transistor Q71 is mounted as a switch corresponding to the switch C3 in FIG. 1. The output of the module CI1 is produced by the transistor Q78 connected by its collector to the predetermined supply voltage which can be 5 volts, represented in point 9, and by its emitter at the base of the ignition transistor T1 which is connected to point 8 in FIG. 3. The comparator circuit OP1 compares the existing potentials with the respective bases of the transistors Q69 and Q70 which correspond respectively to the potential of point A, c that is to say at the output of the module CI2 of FIG. 1, and at the potential of
Les transistors Q64 à Q78 composant le circuit de commande de l'allumage CI1 précité sont polarisés de façon adéquate par des résistances R32 à R39 et R52 R53 de valeur appropriée.The transistors Q64 to Q78 making up the aforementioned CI1 ignition control circuit are suitably biased by resistors R32 to R39 and R52 R53 of appropriate value.
Le circuit représenté sur la figure 4 constitue la partie circuit de sécurité CI2 de la figure 1. Le circuit comparateur OP2 est composé de deux transistors Q47 et Q48 montés symétriquement et dont les émetteurs sont reliés. Les sources de courant constant G1 et G2 sont respectivement constituées par trois transistors Q40 à Q42 du type NPN montés en parallèle et deux transistors Q51, Q52 ayant leur base commune. Le circuit comparateur OP2 est commandé au moyen des deux transistors Q49 et Q50 du type PNP constituant respectivement les commutateurs C2 et C1 précités la base du transistor Q49 étant reliée au point B de la figure 1. Le commutateur de commande C4 est réalisé par l'association des transistors Q43, Q44, Q54 et Q55. La base du transistor Q44 est reliée au point C de la figure 1. Le transistor Q53 du type PNP constitue le transistor T2 de la figure 1 dont la base est reliée au condensateur de charge CDI.The circuit shown in FIG. 4 constitutes the safety circuit part CI2 of FIG. 1. The comparator circuit OP2 is composed of two transistors Q47 and Q48 mounted symmetrically and whose transmitters are connected. Current sources constant G1 and G2 are respectively constituted by three transistors Q40 to Q42 of the NPN type connected in parallel and two transistors Q51, Q52 having their common base. The comparator circuit OP2 is controlled by means of the two transistors Q49 and Q50 of the PNP type constituting the aforementioned switches C2 and C1 respectively, the base of the transistor Q49 being connected to point B in FIG. 1. The control switch C4 is produced by the association of transistors Q43, Q44, Q54 and Q55. The base of transistor Q44 is connected to point C in FIG. 1. The transistor Q53 of the PNP type constitutes the transistor T2 of FIG. 1, the base of which is connected to the charge capacitor CDI.
Les transistors Q40 à Q55 composant le circuit de sécurité CI2 sont polarisés de façon adéquate au moyen de résistances R24 à R30 de valeur appropriée.The transistors Q40 to Q55 making up the safety circuit CI2 are suitably biased by means of resistors R24 to R30 of appropriate value.
La sortie du module CI2 est indiquée par le point A, relié à la base du transistor Q50.The output of module CI2 is indicated by point A, connected to the base of transistor Q50.
La description du fonctionnement du dispositif d'allumage électronique selon la présente invention se fera notamment en référence à la figure 2 donnant l'allure des signaux en sortie du système de commande, la tension aux bornes du condensateur de charge et l'évolution du courant dans la bobine du circuit d'allumage du moteur.The description of the operation of the electronic ignition device according to the present invention will be made in particular with reference to Figure 2 giving the appearance of the signals output from the control system, the voltage across the charge capacitor and the evolution of the current. in the ignition circuit of the engine.
L'allumage électronique de moteur est commandé par le système de commande 1 au microprocesseur au moyen du port de sortie de commande P1.The electronic engine ignition is controlled by the
A la mise sous tension du système, le port P1 de sortie est au miveau haut, forçant le pint E1 à 1 comme il apparaît dans la partie I du diagramme synoptique des signaux de la figure 2. Dans ce cas, le RESET est au niveau bas, le commutateur C4 est ouvert, ce qui provoque la fermeture de C2. La tension aux bornes du condensateur reste nulle. L'entrée E1 étant au niveau haut, le commutateur C3 se ferme mais tout le courant provenant de la source de courant constant G3 est dévié dans le circuit comparateur OP1. Ainsi, la bobin L1 ne se charge pas en courant.When the system is powered up, the output port P1 is at the high level, forcing the pint E1 to 1 as it appears in part I of the diagram diagram of the signals of FIG. 2. In this case, the RESET is at the low level, the switch C4 is open, which causes the closing of C2. The voltage across the capacitor remains zero. The input E1 being at the high level, the switch C3 closes but all the current coming from the constant current source G3 is deflected in the comparator circuit OP1. Thus, the coil L1 does not charge with current.
Dans le cas du fonctionnement normal du système, RESET est passé au niveau haut comme il apparaît clairement dans le partie II de la figure 2. Simultanément, le micro-ordinateur commande l'entrée E1 au niveau bas ouvrant ainsi le commutateur C3, tandis que les commutateurs C4 et C1 se ferment et le commutateur C2 s'ouvre. Le générateur de courant constant G1 fournit donc un courant au condensateur de charge CDI dont la tension à ses bornes croît jusqu'à atteindre une valeur de charge de référence VREF ; simultanément la tension au point A augmente. Le commutateur C3 étant ouvert, la charge en courant de la bobine ne peut s'effectuer.In the case of normal operation of the system, RESET has gone to the high level as it clearly appears in part II of FIG. 2. Simultaneously, the microcomputer controls the input E1 at the low level thus opening the switch C3, while switches C4 and C1 close and switch C2 opens. The constant current generator G1 therefore supplies a current to the charge capacitor CDI whose voltage across its terminals increases until it reaches a reference charge value VREF; simultaneously the voltage at point A increases. The C3 switch being open, the current charging of the coil cannot be carried out.
Lorsque le micro-ordinateur passe l'entrée E1 à l'état haut, le commutateur C3 se ferme, permettant ainsi le passage d'un courant à la base du transistor de commande d l'allumage T1-(cas III de la figure 2). En effet, comme il ressort de la figure 3, le transistor Q71 constituant C3 est conducteur permettant l'écoulement d'un courant à travers les transistors Q74 et la résistance R37 ce qui rend conducteurs les transistors Q76 et Q78. Dans ce cas, la tension au point A a pour valeur VREF. Le circuit comparateur OP1 va comparer la tension au point A et la tension dans le circuit bobine aux bornes de R2. La sortie dudit comparateur commande la charge en courant de la bobine au moyen de la base du transistor T1. Il en résulte que la bobine se charge en courant approximativement jusqu'à ce que la tension aux bornes de R2 soit égale à la tension au point A c'est-à-dire VREF.When the microcomputer passes the input E1 to the high state, the switch C3 closes, thus allowing the passage of a current at the base of the transistor controlling the ignition T1- (case III of FIG. 2 ). In fact, as is apparent from FIG. 3, the transistor Q71 constituting C3 is conductive allowing the flow of a current through the transistors Q74 and the resistor R37 which makes the transistors Q76 and Q78 conductive. In this case, the voltage at point A has the value VREF. The comparator circuit OP1 will compare the voltage at point A and the voltage in the coil circuit at the terminals of R2. The output of said comparator controls the current load of the coil by means of the base of transistor T1. As a result, the coil charges with current approximately until the voltage across R2 is equal to the voltage at point A, that is to say VREF.
Lorsque le micro-ordinateur passe E1 à l'état base, le commutateur C3 s'ouvre, il y a alors coupure brusque du courant primaire dans la bobine L1 et création d'étincelles sur la bougie connectée au secondaire de la bobine E. C'est le cas du fonctionnement normal (cas IV, figure 2).When the microcomputer goes E1 to the basic state, the switch C3 opens, there is then a sudden cut of the primary current in the coil L1 and creation of sparks on the spark plug connected to the secondary of the coil E. C 'is the case of normal operation (case IV, figure 2).
Considérons maintenant le cas où le système de commande tombe en défaillance et que la tension aux bornes du condensateur soit VREF (cas V de la figure 2). Le RESET est à l'état bas. L'entrée E1 qui était au niveau haut reste forcée au niveau haut au moyen de la résistance R1 montée en dérivation (voir figure 1). Ainsi, le commutateur C3 reste fermé. Par contre, le commutateur C4 s'ouvre, ainsi que le commutateur C1, et le commutateur C2 se ferme pour amorcer la décharge linéaire du condensateur CD1. Ainsi, la tension au point A baisse progressivement régulant ainsi le courant de base du transistor T1 d'allumage et en conséquence la tension aux bornes R2 du circuit bobine. On assiste donc à une décroissance linéaire du courant bobine et à l'absence d'étincelles dans ce cas. En effet, comme le montre la figure 3, le transistor Q77, par l'intermédiaire du transistor Q72, devient conducteur et dévie une partie du courant débité par le transistor Q76 à la masse.Now consider the case where the control system fails and the voltage across the capacitor is VREF (case V in Figure 2). RESET is low. The input E1 which was at the high level remains forced at the high level by means of the resistor R1 mounted in bypass (see figure 1). Thus, the switch C3 remains closed. On the other hand, the switch C4 opens, as well as the switch C1, and the switch C2 closes to initiate the linear discharge of the capacitor CD1. Thus, the voltage at point A gradually decreases, thereby regulating the base current of the ignition transistor T1 and consequently the voltage at the terminals R2 of the coil circuit. There is therefore a linear decrease in the coil current and the absence of sparks in this case. Indeed, as shown in Figure 3, the transistor Q77, via the transistor Q72, becomes conductive and deflects part of the current supplied by the transistor Q76 to ground.
Dans le cas VII de la figure 2, le RESET passe au niveau bas alors que l'entrée E1 était au niveau bas-Si E1 passe à l'état haut, et la tension au point A est égale à VREF, le dispositif de l'invention va contrôler la chute progressive du courant bobine. En effect, E1 passant à l'état haut, le commutateur C3 se ferme, amorçant la charge en courant de la bobine L1. Mais RESET passant à l'état bas, provoque l'ouverture du commutateur C4 et la fermeture du commutateur C2 ce qui fait décroître, comme dans le cas précédent, la tension aux bornes du condensateur CDI et par suite la tension aux bornes de la résistance de sortie R2.In case VII of Figure 2, the RESET goes low while the input E1 was low-If E1 goes high, and the voltage at the point A is equal to VREF, the device of the invention will control the gradual fall of the coil current. In fact, E1 going high, the switch C3 closes, initiating the current load of the coil L1. But RESET going low, causes the switch C4 to open and the switch C2 to close, which decreases, as in the previous case, the voltage across the CDI capacitor and therefore the voltage across the resistor. R2 output.
On peut également envisager que la tension aux bornes du condensateur CDI commande plusieurs bobines et dans ce cas, des parties CI1 identiques à celle décrite pour un dispositif d'allumage à une seule bobine devront être reproduites pour chaque bobine.It is also conceivable that the voltage across the capacitor CDI controls several coils and in this case, parts CI1 identical to that described for an ignition device with a single coil must be reproduced for each coil.
Le signal de défaillance est donné soit par le microcalculateur, en cas de déroutage volontaire, soit par un module externe au système (module 2 figure 1) ou "chien de garde". Ce "chien de garde" peut-être :
- soit du type numérique, c'est-à-dire du type compteur actionné par une horloge, qui lorsqu'il déborde, actionne un RESET. Il suffit de calibrer la taille du compteur et la fréquence d'horloge pour déterminer l'intervalle de temps minimum pendant lequel le micro-ordinateur doit remettre à zéro le circuit.
- soit du type analogique, c'est-à-dire tel qu'un générateur de courant qui charge un condensateur. Lorsque le niveau de tension aux bornes du condensateur dépasse le niveau de référence détecté par un comparateur, il y a actionnement du RESET. Le condensateur est déchargé par les impulsions de "chien de garde". Il suffit de calibrer la valeur du condensateur, le niveau de référence et la valeur du courant de charge pour déterminer l'intervalle de temps équivalent au système précédent.The failure signal is given either by the microcomputer, in case of voluntary rerouting, or by a module external to the system (
- or of the digital type, that is to say of the counter type activated by a clock, which when it overflows, activates a RESET. It is sufficient to calibrate the size of the counter and the clock frequency to determine the minimum time interval during which the microcomputer must reset the circuit to zero.
- or of the analog type, that is to say such as a current generator which charges a capacitor. When the voltage level across the capacitor exceeds the reference level detected by a comparator, RESET is actuated. The capacitor is discharged by the "watchdog" pulses. Just calibrate the value of the capacitor, the reference level and the value of the charging current to determine the time interval equivalent to the previous system.
L'avantage du dispositif selon la présente invention réside dans le fait que par action sur une tension de référence qui peut être commune à plusieurs montages Darlington d'allumage, un seul et unique moyen assure la coupure lente du courant bobine. Cette coupure est assurée systèmatiquement sur chaque RESET du micro-ordinateur que ce RESET provienne d'une commande du micro-ordinateur ou du "chien de garde" ou encore par commande directe par un circuit externe.The advantage of the device according to the present invention lies in the fact that by acting on a reference voltage which can be common to several Darlington ignition assemblies, a single and unique means ensures the slow breaking of the coil current. This cut-off is systematically ensured on each RESET of the microcomputer whether this RESET comes from a command from the microcomputer or from the "watchdog" or even by direct command by an external circuit.
L'invention présente également une importance économique intéressante, notamment en ce qui concerne sa fiabilité dans le domaine de la distribution statique : les solutions de l'invention associées à la fonction limitation de la haute tension du Darlington d'allumage ont permis la conception d'un circuit intégré bipolaire analogique 18 broches qui sert d'interface entre le micro-ordinateurs et deux Darlingtons commandant deux bobines d'allumage double (moteur 4 cylindres).The invention also presents an interesting economic importance, in particular with regard to its reliability in the field of static distribution: the solutions of the invention associated with the high voltage limitation function of the ignition Darlington have enabled the design of '' an 18-pin analog bipolar integrated circuit which serves as an interface between the microcomputers and two Darlingtons controlling two double ignition coils (4-cylinder engine).
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8610359 | 1986-07-16 | ||
FR8610359A FR2601724B1 (en) | 1986-07-16 | 1986-07-16 | SECURITY FOR ELECTRONIC IGNITION WITH STATIC DISTRIBUTION |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0255423A1 true EP0255423A1 (en) | 1988-02-03 |
EP0255423B1 EP0255423B1 (en) | 1995-05-17 |
Family
ID=9337478
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19870401653 Expired - Lifetime EP0255423B1 (en) | 1986-07-16 | 1987-07-10 | Safety in electronic ignition with static distributor |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0255423B1 (en) |
DE (1) | DE3751298T2 (en) |
FR (1) | FR2601724B1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2356826A1 (en) * | 1976-07-02 | 1978-01-27 | Motorola Inc | STARTING CIRCUIT FOR ELECTRONIC IGNITION |
US4324216A (en) * | 1980-01-09 | 1982-04-13 | Fairchild Camera & Instrument Corp. | Ignition control system with electronic advance |
FR2492004A1 (en) * | 1980-10-09 | 1982-04-16 | Tokyo Shibaura Electric Co | INTERNAL COMBUSTION ENGINE IGNITION COIL EXCITATION CIRCUIT |
US4368717A (en) * | 1980-08-07 | 1983-01-18 | Eltra Corporation | Automatic shut-off circuit for electronic ignition system |
US4492213A (en) * | 1980-12-08 | 1985-01-08 | Nippondenso Co., Ltd. | Ignition system for internal combustion engines |
-
1986
- 1986-07-16 FR FR8610359A patent/FR2601724B1/en not_active Expired - Lifetime
-
1987
- 1987-07-10 EP EP19870401653 patent/EP0255423B1/en not_active Expired - Lifetime
- 1987-07-10 DE DE19873751298 patent/DE3751298T2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2356826A1 (en) * | 1976-07-02 | 1978-01-27 | Motorola Inc | STARTING CIRCUIT FOR ELECTRONIC IGNITION |
US4324216A (en) * | 1980-01-09 | 1982-04-13 | Fairchild Camera & Instrument Corp. | Ignition control system with electronic advance |
US4368717A (en) * | 1980-08-07 | 1983-01-18 | Eltra Corporation | Automatic shut-off circuit for electronic ignition system |
FR2492004A1 (en) * | 1980-10-09 | 1982-04-16 | Tokyo Shibaura Electric Co | INTERNAL COMBUSTION ENGINE IGNITION COIL EXCITATION CIRCUIT |
US4492213A (en) * | 1980-12-08 | 1985-01-08 | Nippondenso Co., Ltd. | Ignition system for internal combustion engines |
Also Published As
Publication number | Publication date |
---|---|
DE3751298D1 (en) | 1995-06-22 |
DE3751298T2 (en) | 1995-11-23 |
FR2601724B1 (en) | 1990-05-04 |
EP0255423B1 (en) | 1995-05-17 |
FR2601724A1 (en) | 1988-01-22 |
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