EP0921305A2 - Method and device for the alimentation control of a bobbin for a contactor of an automotive vehicle starter - Google Patents

Method and device for the alimentation control of a bobbin for a contactor of an automotive vehicle starter Download PDF

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Publication number
EP0921305A2
EP0921305A2 EP98403004A EP98403004A EP0921305A2 EP 0921305 A2 EP0921305 A2 EP 0921305A2 EP 98403004 A EP98403004 A EP 98403004A EP 98403004 A EP98403004 A EP 98403004A EP 0921305 A2 EP0921305 A2 EP 0921305A2
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EP
European Patent Office
Prior art keywords
contactor
voltage
winding
supply
starter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98403004A
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German (de)
French (fr)
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EP0921305A3 (en
EP0921305B1 (en
Inventor
Gérard Vilou
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Valeo Equipements Electriques Moteur SAS
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Valeo Equipements Electriques Moteur SAS
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Publication of EP0921305A3 publication Critical patent/EP0921305A3/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0859—Circuits or control means specially adapted for starting of engines specially adapted to the type of the starter motor or integrated into it
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/087—Details of the switching means in starting circuits, e.g. relays or electronic switches
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/06—Parameters used for control of starting apparatus said parameters being related to the power supply or driving circuits for the starter
    • F02N2200/063—Battery voltage

Definitions

  • the present invention relates to the control of the supply of the winding of a starter switch of motor vehicle.
  • the starter's electric motor has been referenced there by M. It is mounted between earth and a + Bat terminal at the battery supply voltage.
  • the power supply to motor M is controlled by a contactor C, which is a relay consisting of a contact power 3 controlled by a holding coil 1 and a call winding 2.
  • the power contact 3 is for example interposed between motor M and voltage supply terminal + Bat.
  • a common end of the call and hold 1 and 2 is connected to the power supply terminal + Bat, for example by a start switch 4, which is usually a key switch.
  • the holding coil 1 is connected to ground, the call winding 2 being meanwhile connected to a point between contact 3 and motor M.
  • the electronic control of the contactor allows use only one winding. This is illustrated by the assembly shown in Figure 2, in which the contact of power 3 of contactor C is controlled in motion by a supply winding B, which is mounted between the ground and the + Bat supply terminal at the voltage of the drums.
  • the supply of this coil B is itself controlled by a management unit U, which operates a controlled switch S.
  • This management unit U is usually a microprocessor, including an input ⁇ e ⁇ is for example connected to the terminal + Bat by via the start switch 4 and of which an output ⁇ s ⁇ controls the switch S, which is by example a MOSFET type transistor.
  • the microprocessor U implements a number operations to ensure that the starter is in state of being activated, then the transistor S is controlled by pulse width signal (PWM or ⁇ Pulse Width Modulation ⁇ depending on the terminology generally used), this command allowing to generate on the winding B a law of predetermined tension to ensure advancement to reduced speed of the moving core.
  • PWM pulse width signal
  • ⁇ Pulse Width Modulation ⁇ depending on the terminology generally used
  • FIG. 3a A closing sequence of the startup 4 is illustrated in FIG. 3a and we have shown in Figure 3b opposite an example of the evolution over time of the average supply current Ic circulating in the winding B during this sequence of closing.
  • Figure 3c illustrates the sequence of closing the power contact 3 which corresponds to this diet.
  • the PWM command from microprocessor U reduces the current in coil B to a minimum value ⁇ im ⁇ which ensures that the magnetic circuit in closed state.
  • An object of the invention is therefore to resolve this problem.
  • the invention proposes an order that minimizes so substantial winding overheating while ensuring a highly reliable closure.
  • the invention proposes a method for the control of the winding supply of a contactor motor vehicle starter, according to which supplies said winding according to a call mode intended for close said contactor, then in a holding mode intended to keep said contactor closed, characterized in that we measure a voltage corresponding to the voltage the starter electric motor, that we detect on this voltage a fall corresponding to the closure of the contactor and in that the winding of the contactor in hold mode after a predetermined time after detection of the fall of voltage.
  • the voltage corresponding to the voltage starter electric motor supply is measured in a sampled fashion and, to detect the voltage drop, the difference is compared to a threshold between two successive voltage measurements.
  • the threshold corresponds to a voltage drop of the order of 1 Volt.
  • the invention also relates to a device for control of the supply of an electric motor vehicle starter having a contactor which is a relay which includes a power contact and a winding, as well as a management unit intended for successively control the supply of said winding according to a call mode intended to close said contactor, then according to a maintenance mode intended to maintain said closed contactor, said management unit measuring a voltage which, when starting is commanded, corresponds to the motor supply voltage electric starter and controlling the supply of electric motor depending in particular on this voltage, characterized in that said management unit comprises means for implementing the above method.
  • the winding supply is controlled by a MOSFET type transistor, the gate is controlled by a pulse voltage at modulated width generated by the management unit.
  • the management unit includes means for controlling the closing of the transistor, during winding supply in call mode.
  • the invention also relates to a starter for motor vehicle, characterized in that it comprises a control device of the aforementioned type.
  • the command sequence which is illustrated on the Figure 4 is implemented by the control means of single coil power supply B which are illustrated in Figure 2, i.e. by the controlled switch S and the management unit U, the latter being programmed to control said transistor S according to the command sequence which will now be described.
  • step I in FIG. 4 the management unit U is put powered up and initializes (step II).
  • the tension + Bat that it receives on its entry ⁇ e ⁇ is sampled and digitally converted.
  • the numerical values thus obtained for the voltage + Bat are processed by unit U, said unit U generating on its output ⁇ s ⁇ a PWM voltage for controlling the gate of transistor S which is notably a function of these voltage values + Bat.
  • the unit U compares the difference (+ Bat i - + Bat i + 1 ) between two successive voltage measurements + Bat i and + Bat i + 1 (where i is a silent index associated with successive samplings), to a given dU threshold (test IV).
  • transistor S is controlled so that the current Ic is greater than im (step III).
  • Coil B can for example then be put under full tension, the management unit U then commanding the total closure of transistor S.
  • unit U changes the duty cycle of its voltage PWM output, so as to control transistor S for that the current in coil B is maintained at its value im (step VI), after a time delay for a duration T1 (step V).
  • the value of im is chosen sufficient to keep the magnetic circuit closed.
  • dU The value of dU is chosen to allow detect the voltage drop produced by closing the contact 3.
  • the value of the threshold dU is for example chosen for correspond to 1 Volt.
  • time delay T1 between detection of closing contact 3 and switching to mode maintenance prevents rebounds and ensure that the contactor is effectively closed, when you go into hold mode.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Motor And Converter Starters (AREA)
  • Control Of Direct Current Motors (AREA)
  • Relay Circuits (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

The solenoid is supplied in a closure mode and a maintenance mode. The current is reduced in maintenance mode. A voltage corresponding to the supply voltage to the starter motor is measured, and when this voltage falls in response to closure of the starter solenoid, the current supply is reduced to maintenance mode level for a predetermined time.

Description

La présente invention est relative à la commande de l'alimentation du bobinage d'un contacteur de démarreur de véhicule automobile.The present invention relates to the control of the supply of the winding of a starter switch of motor vehicle.

On a illustré sur la figure 1 un schéma classique de montage de démarreur.A classic diagram of starter assembly.

Le moteur électrique du démarreur y a été référencé par M. Il est monté entre la masse et une borne +Bat à la tension d'alimentation de la batterie.The starter's electric motor has been referenced there by M. It is mounted between earth and a + Bat terminal at the battery supply voltage.

L'alimentation du moteur M est commandée par un contacteur C, qui est un relais constitué d'un contact de puissance 3 commandé par un bobinage de maintien 1 et un bobinage d'appel 2.The power supply to motor M is controlled by a contactor C, which is a relay consisting of a contact power 3 controlled by a holding coil 1 and a call winding 2.

Le contact de puissance 3 est par exemple interposé entre le moteur M et la borne d'alimentation à la tension +Bat.The power contact 3 is for example interposed between motor M and voltage supply terminal + Bat.

Une extrémité commune des bobinages d'appel et de maintien 1 et 2 est reliée à la borne d'alimentation +Bat, par exemple par un interrupteur de démarrage 4, qui est généralement un interrupteur de clé de contact. A son extrémité opposée, le bobinage 1 de maintien est relié à la masse, le bobinage 2 d'appel étant quant à lui relié à un point entre le contact 3 et le moteur M.A common end of the call and hold 1 and 2 is connected to the power supply terminal + Bat, for example by a start switch 4, which is usually a key switch. At its opposite end, the holding coil 1 is connected to ground, the call winding 2 being meanwhile connected to a point between contact 3 and motor M.

Lors de la fermeture de l'interrupteur 4 de clé de contact , les deux bobinages- 1 et 2 sont alimentés simultanément de façon à ce que leurs effets magnétiques d'attraction du noyau mobile du contacteur s'additionnent. Ces forces d'attraction sont suffisantes pour vaincre les ressorts de rappel et les frottements tant sur le contacteur que sur le lanceur. En fin de course, la fermeture du contact de puissance 3 met les deux extrémités du bobinage d'appel 2 sensiblement au même potentiel, ce qui élimine tout passage de courant dans celui-ci. Seul le bobinage 1 de maintien reste alimenté. Mais, en raison du très faible entrefer qui subsiste à ce moment-là, les forces développées par le bobinage 1 de maintien restent supérieures aux forces de rappels de différents ressorts ce qui permet de maintenir le contacteur C fermé. Ce système économise le courant consommé par le bobinage d'appel 2 et évite des échauffements excessifs de celui-ci.When closing the key switch 4 contact, the two windings - 1 and 2 are supplied simultaneously so that their magnetic effects of the moving core of the contactor add up. These attractive forces are sufficient to overcome return springs and friction both on the contactor and on the launcher. In end of stroke, closing the power contact 3 puts the two ends of the call winding 2 substantially at same potential, which eliminates any current flow In this one. Only the holding coil 1 remains powered. But, due to the very small air gap which remains at that time, the forces developed by the winding 1 holding remain greater than the forces of reminders of different springs which allows to maintain contactor C closed. This system saves current consumed by the call winding 2 and avoids excessive heating of it.

La commande électronique du contacteur permet de n'utiliser qu'un seul bobinage. C'est ce qu'illustre le montage représenté sur la figure 2, sur lequel le contact de puissance 3 du contacteur C est commandé en mouvement par un bobinage d'alimentation B, qui est monté entre la masse et la borne +Bat d'alimentation à la tension de la batterie. L'alimentation de ce bobinage B est elle-même commandée par une unité de gestion U, qui actionne un interrupteur commandé S. Cette unité de gestion U est généralement un microprocesseur, dont une entrée 〈〈 e 〉〉 est par exemple reliée à la borne +Bat par l'intermédiaire de l'interrupteur de démarrage 4 et dont une sortie 〈〈 s 〉〉 commande l'interrupteur S, qui est par exemple un transistor de type MOSFET.The electronic control of the contactor allows use only one winding. This is illustrated by the assembly shown in Figure 2, in which the contact of power 3 of contactor C is controlled in motion by a supply winding B, which is mounted between the ground and the + Bat supply terminal at the voltage of the drums. The supply of this coil B is itself controlled by a management unit U, which operates a controlled switch S. This management unit U is usually a microprocessor, including an input 〈〈 e 〉〉 is for example connected to the terminal + Bat by via the start switch 4 and of which an output 〈〈 s 〉〉 controls the switch S, which is by example a MOSFET type transistor.

A la fermeture de l'interrupteur 4, le microprocesseur U met en oeuvre un certain nombre d'opérations permettant de s'assurer que le démarreur est en état d'être actionné, puis le transistor S est commandé par un signal à largeur à impulsions modulées (PWM ou 〈〈 Pulse Width Modulation 〉〉 selon la terminologie anglo-saxonne généralement utilisée), cette commande permettant de générer sur le bobinage B une loi de tension prédéterminée pour assurer un avancement à vitesse réduite du noyau mobile.When switch 4 closes, the microprocessor U implements a number operations to ensure that the starter is in state of being activated, then the transistor S is controlled by pulse width signal (PWM or 〈〈 Pulse Width Modulation 〉〉 depending on the terminology generally used), this command allowing to generate on the winding B a law of predetermined tension to ensure advancement to reduced speed of the moving core.

Une séquence de fermeture de l'interrupteur de démarrage 4 est illustrée sur la figure 3a et on a représenté sur la figure 3b en regard un exemple de l'évolution dans le temps du courant d'alimentation moyen Ic circulant dans le bobinage B lors de cette séquence de fermeture. La figure 3c illustre quant à elle la séquence de fermeture du contact de puissance 3 qui correspond à cette alimentation. A closing sequence of the startup 4 is illustrated in FIG. 3a and we have shown in Figure 3b opposite an example of the evolution over time of the average supply current Ic circulating in the winding B during this sequence of closing. Figure 3c illustrates the sequence of closing the power contact 3 which corresponds to this diet.

Pendant toute une première durée T suivant la fermeture de l'interrupteur 4, le courant Ic est maintenu a un niveau d'appel suffisamment élevé pour garantir la fermeture du contact de puissance 3. Cette durée T est choisie suffisamment grande pour obtenir la fermeture des contacts dans toutes les configurations de fonctionnement : type de batterie, état de charge de la batterie, type de démarreur, température de démarrage, ... .During a whole first duration T following the closing of switch 4, current Ic is maintained has a sufficiently high call level to guarantee the power contact 3 closes. This duration T is chosen large enough to close the contacts in all configurations of operation: type of battery, state of charge of the battery, type of starter, starting temperature, ....

A l'issue de cette première période, la commande PWM du microprocesseur U réduit le courant dans la bobine B à une valeur minimale 〈〈 im 〉〉 qui assure le maintien du circuit magnétique à l'état fermé.At the end of this first period, the PWM command from microprocessor U reduces the current in coil B to a minimum value 〈〈 im 〉〉 which ensures that the magnetic circuit in closed state.

Comme on l'aura compris, l'incertitude sur le temps réellement mis pour fermer le contact de puissance 3 impose de prendre un temps T surabondant pour le passage en mode maintien.As will be understood, the uncertainty over time actually put to close the power contact 3 requires taking an overabundant time T for the passage in hold mode.

Mais, dans la majorité des cas, la fermeture du contact de puissance 3 a lieu bien avant la fin de cette période de durée T (entre les temps qui correspondent aux points A et a représentés sur la figure 3b)However, in most cases, closing the power contact 3 takes place well before the end of this period of duration T (between the times which correspond to points A and a shown in Figure 3b)

Il s'ensuit des échauffements inutiles du transistor de puissance 3, pendant toute la partie de cette période de durée T où le contact de puissance 3 est fermé, c'est à dire pendant toute la période référencée par D sur la figure 3c.This results in unnecessary heating of the transistor of power 3, during the whole part of this period of duration T where the power contact 3 is closed, this is to say during the whole period referenced by D on the figure 3c.

Un but de l'invention est donc de résoudre ce problème.An object of the invention is therefore to resolve this problem.

Il a déjà été proposé dans DE 43 44 355 une commande d'alimentation d'un bobinage de contacteur selon laquelle on fournit au bobinage une alimentation de maintien dès que la fermeture du contacteur est détectée.An order has already been proposed in DE 43 44 355 supply of a contactor winding according to which the coil is supplied with holding power as soon as that the closing of the contactor is detected.

L'invention propose quant à elle une commande d'alimentation qui permet de minimiser de façon substantielle les échauffements du bobinage tout en assurant une fermeture d'une grande fiabilité. The invention proposes an order that minimizes so substantial winding overheating while ensuring a highly reliable closure.

A cet effet l'invention propose un procédé pour la commande de l'alimentation du bobinage d'un contacteur de démarreur de véhicule automobile, selon lequel on alimente ledit bobinage selon un mode d'appel destiné à fermer ledit contacteur, puis selon un mode de maintien destiné à maintenir ledit contacteur fermé, caractérisé en ce qu'on mesure une tension correspondant à la tension d'alimentation du moteur électrique du démarreur, en ce qu'on détecte sur cette tension une chute correspondant à la fermeture du contacteur et en ce qu'on alimente le bobinage du contacteur en mode de maintien à l'issue d'un temps prédéterminé après la détection de la chute de tension.To this end, the invention proposes a method for the control of the winding supply of a contactor motor vehicle starter, according to which supplies said winding according to a call mode intended for close said contactor, then in a holding mode intended to keep said contactor closed, characterized in that we measure a voltage corresponding to the voltage the starter electric motor, that we detect on this voltage a fall corresponding to the closure of the contactor and in that the winding of the contactor in hold mode after a predetermined time after detection of the fall of voltage.

De préférence, la tension correspondant à la tension d'alimentation du moteur électrique du démarreur est mesurée de façon échantillonnée et, pour détecter la chute de tension, on compare à un seuil la différence entre deux mesures de tension successives.Preferably, the voltage corresponding to the voltage starter electric motor supply is measured in a sampled fashion and, to detect the voltage drop, the difference is compared to a threshold between two successive voltage measurements.

De façon avantageuse, le seuil correspond à une chute de tension de l'ordre de 1 Volt.Advantageously, the threshold corresponds to a voltage drop of the order of 1 Volt.

L'invention concerne également un dispositif pour la commande de l'alimentation d'un moteur électrique de démarreur de véhicule comportant un contacteur qui est un relais qui comprend un contact de puissance et un bobinage, ainsi qu'une unité de gestion destinée à commander successivement l'alimentation dudit bobinage selon un mode d'appel destiné à fermer ledit contacteur, puis selon un mode de maintien destiné à maintenir ledit contacteur fermé, ladite unité de gestion mesurant une tension qui, lorsque le démarrage est commandé, correspond à la tension d'alimentation du moteur électrique du démarreur et commandant l'alimentation du moteur électrique en fonction notamment de cette tension, caractérisé en ce que ladite unité de gestion comporte des moyens pour mettre en oeuvre le procédé précité. The invention also relates to a device for control of the supply of an electric motor vehicle starter having a contactor which is a relay which includes a power contact and a winding, as well as a management unit intended for successively control the supply of said winding according to a call mode intended to close said contactor, then according to a maintenance mode intended to maintain said closed contactor, said management unit measuring a voltage which, when starting is commanded, corresponds to the motor supply voltage electric starter and controlling the supply of electric motor depending in particular on this voltage, characterized in that said management unit comprises means for implementing the above method.

Avantageusement, l'alimentation du bobinage est commandée par un transistor de type MOSFET, dont la grille est commandée par une tension à impulsions à largeur modulée générée par l'unité de gestion.Advantageously, the winding supply is controlled by a MOSFET type transistor, the gate is controlled by a pulse voltage at modulated width generated by the management unit.

De préférence, l'unité de gestion comportent des moyens pour commander la fermeture du transistor, lors de l'alimentation du bobinage en mode d'appel.Preferably, the management unit includes means for controlling the closing of the transistor, during winding supply in call mode.

L'invention concerne également un démarreur de véhicule automobile, caractérisé en ce qu'il comporte un dispositif de commande du type précité.The invention also relates to a starter for motor vehicle, characterized in that it comprises a control device of the aforementioned type.

D'autres caractéristiques et avantages de l'invention ressortiront encore de la description qui suit qui est purement illustrative et non limitative et doit être lue en regard des dessins annexés sur lesquels :

  • la figure 1, déjà analysée, illustre un montage de démarreur conforme à un mode de réalisation connu de l'art antérieur ;
  • la figure 2, également déjà discutée, illustre un montage de commande électronique de démarreur dont le contacteur comporte un bobinage unique qui réalise à la fois l'appel et le maintien ;
  • les figures 3a à 3c illustrent une séquence possible pour l'alimentation du bobinage unique du contacteur du montage de la figure 2 ;
  • la figure 4 est un organigramme qui illustre une commande de l'alimentation du bobinage unique du contacteur du montage de la figure 2.
Other characteristics and advantages of the invention will emerge from the following description which is purely illustrative and not limiting and should be read with reference to the appended drawings in which:
  • Figure 1, already analyzed, illustrates a starter assembly according to an embodiment known from the prior art;
  • FIG. 2, also already discussed, illustrates an electronic starter control assembly whose contactor comprises a single coil which performs both the call and the hold;
  • Figures 3a to 3c illustrate a possible sequence for supplying the single winding of the contactor of the assembly of Figure 2;
  • FIG. 4 is a flow diagram which illustrates a control of the supply of the single winding of the contactor of the assembly of FIG. 2.

La séquence de commande qui est illustrée sur la figure 4 est mise en oeuvre par les moyens de commande de l'alimentation du bobinage unique B qui sont illustrés sur la figure 2, c'est à dire par l'interrupteur commandé S et l'unité de gestion U, cette dernière étant programmée pour réaliser une commande dudit transistor S selon la séquence de commande qui va maintenant être décrite. The command sequence which is illustrated on the Figure 4 is implemented by the control means of single coil power supply B which are illustrated in Figure 2, i.e. by the controlled switch S and the management unit U, the latter being programmed to control said transistor S according to the command sequence which will now be described.

A la fermeture de l'interrupteur de démarrage 4, (étape I sur la figure 4), l'unité de gestion U est mise sous tension et s'initialise (étape II).When the start switch 4 is closed, (step I in FIG. 4), the management unit U is put powered up and initializes (step II).

La tension +Bat qu'elle reçoit sur son entrée 〈〈 e 〉〉 est échantillonnée et convertie numériquement. Les valeurs numériques ainsi obtenues pour la tension +Bat sont traitées par l'unité U, ladite unité U générant sur sa sortie 〈〈 s 〉〉 une tension PWM pour la commande de la grille du transistor S qui est notamment fonction de ces valeurs de la tension +Bat.The tension + Bat that it receives on its entry 〈〈 e 〉〉 is sampled and digitally converted. The numerical values thus obtained for the voltage + Bat are processed by unit U, said unit U generating on its output 〈〈 s 〉〉 a PWM voltage for controlling the gate of transistor S which is notably a function of these voltage values + Bat.

En particulier, l'unité U compare la différence (+Bati - +Bati+1) entre deux mesures de tension successives +Bati et +Bati+1 (où i est un indice muet associé aux échantillonnages successifs), à un seuil dU donné (test IV).In particular, the unit U compares the difference (+ Bat i - + Bat i + 1 ) between two successive voltage measurements + Bat i and + Bat i + 1 (where i is a silent index associated with successive samplings), to a given dU threshold (test IV).

Tant que cette différence est inférieure audit seuil, le transistor S est commandé de façon que le courant Ic soit supérieur à im (étape III). La bobine B peut par exemple alors être mise sous pleine tension, l'unité de gestion U commandant alors la fermeture totale du transistor S.As long as this difference is less than said threshold, transistor S is controlled so that the current Ic is greater than im (step III). Coil B can for example then be put under full tension, the management unit U then commanding the total closure of transistor S.

Lorsque cette différence devient supérieure audit seuil, l'unité U change le rapport cyclique de sa tension de sortie PWM, de façon à commander le transistor S pour que le courant dans la bobine B soit maintenu à sa valeur im (étape VI), après une temporisation pendant une durée T1 (étape V). La valeur de im est choisie suffisante pour maintenir le circuit magnétique fermé.When this difference becomes greater than said threshold, unit U changes the duty cycle of its voltage PWM output, so as to control transistor S for that the current in coil B is maintained at its value im (step VI), after a time delay for a duration T1 (step V). The value of im is chosen sufficient to keep the magnetic circuit closed.

La valeur de dU est choisie pour permettre de détecter la chute de tension que produit la fermeture du contact 3.The value of dU is chosen to allow detect the voltage drop produced by closing the contact 3.

On sait en effet que lorsque le contact de puissance 3 se ferme, il se produit un appel de courant très important consécutif à la mise sous tension du moteur électrique M. We know that when the power contact 3 closes, a very current draw occurs important after switching on the motor electric M.

Il s'ensuit une brusque chute de tension - caractéristique de la fermeture du contact - généralement comprise entre 1 et 5 volts, c'est-à-dire nettement supérieure aux chutes de tension générées par la consommation du contacteur C.There follows a sudden drop in blood pressure - characteristic of contact closure - usually between 1 and 5 volts, that is to say clearly greater than the voltage drops generated by the consumption of contactor C.

La valeur du seuil dU est par exemple choisi pour correspondre à 1 Volt.The value of the threshold dU is for example chosen for correspond to 1 Volt.

On notera que la temporisation T1 entre la détection de la fermeture du contact 3 et le passage en mode maintien permet d'éviter les phénomènes de rebonds et de s'assurer que le contacteur est effectivement fermé, lorsque l'on passe en mode maintien.Note that the time delay T1 between detection of closing contact 3 and switching to mode maintenance prevents rebounds and ensure that the contactor is effectively closed, when you go into hold mode.

Comme on l'aura compris, une telle commande permet de minimiser de façon substantielle les échauffements de la bobine B et du transistor de puissance S, sans nécessiter pour le démarreur aucune liaison électrique supplémentaire interne ou externe.As will be understood, such a command allows to substantially minimize the overheating of coil B and power transistor S, without require no electrical connection for the starter additional internal or external.

Claims (7)

Procédé pour la commande de l'alimentation du bobinage d'un contacteur (C) de démarreur de véhicule automobile, selon lequel on alimente ledit bobinage selon un mode d'appel destiné à fermer ledit contacteur (C), puis selon un mode de maintien destiné à maintenir ledit contacteur (C) fermé, caractérisé en ce qu'on mesure une tension correspondant à la tension d'alimentation (+Bat) du moteur électrique (M) du démarreur, en ce qu'on détecte sur cette tension une chute correspondant à la fermeture du contacteur (C) et en ce qu'on alimente le bobinage (B) du contacteur (C) en mode de maintien à l'issue d'un temps prédéterminé après la détection de la chute de tension.Method for controlling the supply of the winding of a vehicle starter switch (C) automobile, according to which said winding is supplied according to a call mode intended to close said contactor (C), then according to a maintenance mode intended to maintain said contactor (C) closed, characterized in that a voltage corresponding to the supply voltage (+ Bat) of the electric motor (M) of the starter, in that detects a drop on this voltage corresponding to the closing of the contactor (C) and in that the winding (B) of contactor (C) in hold mode at after a predetermined time after detection of the pressure drop. Procédé selon la revendication 1, caractérisé en ce que la tension correspondant à la tension d'alimentation du moteur électrique (M) du démarreur est mesurée de façon échantillonnée et en ce que pour détecter la chute de tension, on compare à un seuil (dU) la différence entre deux mesures de tension successives.Method according to claim 1, characterized in that the voltage corresponding to the voltage starter electric motor supply (M) is measured in a sampled fashion and in that for detect the voltage drop, we compare to a threshold (dU) the difference between two successive voltage measurements. Procédé selon la revendication 2, caractérisé en ce que le seuil correspond à une chute de tension de l'ordre de 1 Volt.Method according to claim 2, characterized in that the threshold corresponds to a voltage drop of around 1 Volt. Dispositif pour la commande de l'alimentation d'un moteur électrique (M) de démarreur de véhicule comportant un contacteur (C) qui est un relais qui comprend un contact de puissance et un bobinage (B), ainsi qu'une unité de gestion (U) destinée à commander successivement l'alimentation dudit bobinage (B) selon un mode d'appel destiné à fermer ledit contacteur (C), puis selon un mode de maintien destiné à maintenir ledit contacteur (C) fermé, ladite unité de gestion (U) mesurant une tension qui, lorsque le démarrage est commandé, correspond à la tension d'alimentation du moteur électrique (M) du démarreur et commandant l'alimentation du moteur électrique (M) en fonction notamment de cette tension, caractérisé en ce que ladite unité de gestion (U) comporte des moyens pour mettre en oeuvre le procédé selon l'une des revendications précédentes.Power control device an electric motor (M) of a vehicle starter comprising a contactor (C) which is a relay which includes a power contact and a winding (B), as well as a management unit (U) intended to control successively supplying said coil (B) according to a call mode intended to close said contactor (C), then according to a maintenance mode intended to maintain said contactor (C) closed, said management unit (U) measuring a voltage which when starting is controlled, corresponds to the supply voltage of the electric motor (M) of starter and commander the electric motor supply (M) in operation in particular of this tension, characterized in that said management unit (U) comprises means for setting up implements the method according to one of claims previous. Dispositif selon la revendication 4, caractérisé en ce que l'alimentation du bobinage (B) est commandée par un transistor (S) de type MOSFET, dont la grille est commandée par une tension à impulsions à largeur modulée générée par l'unité de gestion (U).Device according to claim 4, characterized in that the winding supply (B) is controlled by a MOSFET transistor (S), the gate is controlled by a pulse voltage at modulated width generated by the management unit (U). Dispositif selon la revendication 5, caractérisé en ce que l'unité de gestion (U) comportent des moyens pour commander la fermeture du transistor (S), lors de l'alimentation du bobinage (B) en mode d'appel.Device according to claim 5, characterized in that the management unit (U) comprises means for controlling the closing of the transistor (S), when energizing the winding (B) in call mode. Démarreur de véhicule automobile, caractérisé en ce qu'il comporte un dispositif de commande selon l'une des revendications 4 à 6.Motor vehicle starter, characterized in that it includes a control device according to one of claims 4 to 6.
EP98403004A 1997-12-03 1998-12-01 Method and device for the alimentation control of a bobbin for a contactor of an automotive vehicle starter Expired - Lifetime EP0921305B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9715222A FR2771780B1 (en) 1997-12-03 1997-12-03 METHOD AND DEVICE FOR CONTROLLING THE POWER OF THE WINDING OF A MOTOR VEHICLE STARTER CONTACTOR
FR9715222 1997-12-03

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EP0921305A2 true EP0921305A2 (en) 1999-06-09
EP0921305A3 EP0921305A3 (en) 1999-06-16
EP0921305B1 EP0921305B1 (en) 2003-04-09

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EP98403004A Expired - Lifetime EP0921305B1 (en) 1997-12-03 1998-12-01 Method and device for the alimentation control of a bobbin for a contactor of an automotive vehicle starter

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US (1) US6176212B1 (en)
EP (1) EP0921305B1 (en)
BR (1) BR9805083A (en)
DE (1) DE69813157T2 (en)
ES (1) ES2197438T3 (en)
FR (1) FR2771780B1 (en)

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EP0796992A1 (en) * 1996-03-21 1997-09-24 Valeo Equipements Electriques Moteur Method and device for controlling a driving contactor for a vehicle starter motor

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FR2802981A1 (en) * 1999-12-28 2001-06-29 Valeo Equip Electr Moteur Identifying motor vehicle starting circuit microcontroller card by including before commencement of normal cycle pulses which are easily identified but do not cause any contactor operation
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Also Published As

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DE69813157T2 (en) 2003-11-20
EP0921305A3 (en) 1999-06-16
BR9805083A (en) 1999-12-14
US6176212B1 (en) 2001-01-23
DE69813157D1 (en) 2003-05-15
FR2771780A1 (en) 1999-06-04
EP0921305B1 (en) 2003-04-09
ES2197438T3 (en) 2004-01-01
FR2771780B1 (en) 2000-02-18

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