EP0814258A1 - Power cut-off system for motor vehicle starter - Google Patents

Power cut-off system for motor vehicle starter Download PDF

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Publication number
EP0814258A1
EP0814258A1 EP97400626A EP97400626A EP0814258A1 EP 0814258 A1 EP0814258 A1 EP 0814258A1 EP 97400626 A EP97400626 A EP 97400626A EP 97400626 A EP97400626 A EP 97400626A EP 0814258 A1 EP0814258 A1 EP 0814258A1
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EP
European Patent Office
Prior art keywords
voltage
starter
value
motor vehicle
threshold value
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Granted
Application number
EP97400626A
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German (de)
French (fr)
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EP0814258B1 (en
Inventor
Bruno Lefebvre
Bruno Jacquet
Gérard Vilou
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Valeo Equipements Electriques Moteur SAS
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Valeo Equipements Electriques Moteur SAS
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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
    • F02N11/0848—Circuits or control means specially adapted for starting of engines with means for detecting successful engine start, e.g. to stop starter actuation
    • 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 stopping of the drive of a thermal engine by its starter is controlled by the vehicle user who releases the ignition key when the thermal engine makes a characteristic noise.
  • the voltage across the battery can vary considerably over time, depending in particular on its state of maintenance or the ambient temperature.
  • the starter may not be cut immediately after the engine has started and will run well beyond the time that would be required.
  • the invention also provides a device for implementing this method.
  • FIG. 1 Is illustrated in Figure 1 a device for controlling the supply of a starter D.
  • a starter is an electric motor mounted between a B + power supply terminal at the vehicle battery voltage and earth.
  • This contactor 1 is a relay actuated by a winding 2. One of the ends of this winding 2 is connected to the supply terminal B + . Its other end is connected on the one hand to the source of a MOSFET transistor 3 and on the other hand to a coil 5 connected to ground.
  • the drain of transistor 3 is connected to the supply terminal B + . Its gate is connected to the output of a unit 4, from which it receives a control voltage.
  • transistor 3 could be replaced by any other type of switch.
  • the unit 4 generates said control voltage as a function on the one hand of the voltage of the supply terminal B + , and on the other hand of the position of the contactor actuated by the key contact (contactor 6).
  • the control means of the unit 4 are shown diagrammatically in FIG. 2.
  • the unit 4 comprises means 7 for measuring the voltage of the terminal B + of supply of the starter D (voltage U bat ).
  • It also includes means 8 for memorizing the voltage U 0 of this terminal B + at the start of starting, that is to say when the ignition key closes the contactor 6.
  • the initial measurement takes place sufficiently early so that the voltage U 0 corresponds to the voltage of the battery before any voltage drop.
  • the voltage of the supply terminal B + is then continuously measured during the entire phase of start-up.
  • the voltage U bat thus measured is compared by a comparator 9 to a value U f of end of starting which is a function of the value of U 0 .
  • the value of k is for example chosen as a function of the average battery voltage at the end of starting, for a given level of the heat engine.
  • the means which constitute the unit 4 can be either analog or digital.
  • the solution proposed by the invention makes it possible to systematically reduce the start-up time to the minimum necessary.
  • this solution makes it possible to overcome variations in the voltage of the battery and in particular those which are due to variations in temperature.
  • the proposed solution has the advantage of being entirely autonomous and of not requiring any additional wiring during installation on the vehicle.
  • the assembly constituted by a control device of the type proposed by the invention and its alternator is indeed interchangeable with a conventional starter.
  • the starter proposed by the invention can be treated as a low current control member, which makes it possible to envisage numerous changes to the start control, for example: control by code entry, by the pedal. acceleration, etc.

Abstract

Procédé pour la commande de la coupure d'un démarreur de véhicule automobile selon lequel on mesure la tension d'alimentation de ce démarreur et on coupe le démarreur lorsque cette tension atteint une valeur seuil (Uf), caractérisé en ce que cette valeur seuil est fonction de la valeur (U0) de la tension d'alimentation en début de démarrage. <IMAGE>Method for controlling the shutdown of a motor vehicle starter, according to which the supply voltage of this starter is measured and the starter is cut off when this voltage reaches a threshold value (Uf), characterized in that this threshold value is function of the value (U0) of the supply voltage at the start of start-up. <IMAGE>

Description

La présente invention est relative à un procédé et à un dispositif pour la coupure d'un démarreur de véhicule automobile après démarrage du moteur thermique de celui-ci.The present invention relates to a method and a device for switching off a motor vehicle starter after starting the internal combustion engine thereof.

Habituellement, l'arrêt de l'entraînement d'un moteur thermique par son démarreur est commandé par l'utilisateur du véhicule qui relâche la clé de contact lorsque le moteur thermique fait un bruit caractéristique.Usually, the stopping of the drive of a thermal engine by its starter is controlled by the vehicle user who releases the ignition key when the thermal engine makes a characteristic noise.

Toutefois, la tendance à rendre les moteurs thermiques de plus en plus silencieux fait qu'il devient difficile pour l'utilisateur de détecter la fin du démarrage. Il en résulte une sollicitation plus sévère du démarreur.However, the tendency to make the thermal engines more and more silent makes that it becomes difficult for the user to detect the end of the starting. This results in more severe stress on the starter.

On connaît déjà de nombreux dispositifs pour couper un démarreur de véhicule automobile lorsque le moteur thermique a démarré et est suffisamment autonome pour atteindre de lui-même son régime de ralenti.Numerous devices are already known for cutting off a motor vehicle starter when the heat engine has started and is sufficiently autonomous to reach its idle speed by itself.

En particulier, il a déjà été proposé de commander la coupure du démarreur en comparant la tension de la batterie à une tension de référence, le démarreur étant coupé lorsque la tension de la batterie atteint cette tension de référence.In particular, it has already been proposed to control the starter cut-off by comparing the battery voltage to a reference voltage, the starter being cut off when the battery voltage reaches this reference voltage.

Un dispositif mettant en oeuvre une telle commande a été décrit dans l'introduction de FR 2 626 417.A device implementing such a command has been described in the introduction to FR 2 626 417.

On sait en effet que lorsqu'un démarreur commence à entraîner un moteur thermique, la tension aux bornes de la batterie subit une brusque diminution du fait du courant important qui circule dans le démarreur. La tension de la batterie retrouve son niveau initial lorsque le moteur thermique a démarré.It is known in fact that when a starter starts to drive a heat engine, the voltage across the battery undergoes a sudden decrease due to the large current flowing in the starter. The battery voltage returns to its initial level when the internal combustion engine has started.

Toutefois, un tel dispositif n'est pas satisfaisant.However, such a device is not satisfactory.

En particulier, la tension aux bornes de la batterie peut varier considérablement dans le temps, en fonction notamment de son état d'entretien ou de la température ambiante.In particular, the voltage across the battery can vary considerably over time, depending in particular on its state of maintenance or the ambient temperature.

De ce fait, si la tension de la batterie est trop basse, il se peut que le démarreur ne soit pas coupé immédiatement après le démarrage du moteur thermique et fonctionne bien au-delà de la durée qui serait nécessaire.Therefore, if the battery voltage is too low, the starter may not be cut immediately after the engine has started and will run well beyond the time that would be required.

Au contraire, si la tension de la batterie est trop importante, il se peut que le démarreur soit coupé intempestivement, bien avant le démarrage du moteur thermique.On the contrary, if the battery voltage is too high, it may happen that the starter is cut unexpectedly, well before the engine starts.

Un but de l'invention est de pallier ces inconvénients.An object of the invention is to overcome these drawbacks.

A cet effet, elle propose un procédé pour la commande de la coupure d'un démarreur de véhicule automobile selon lequel on mesure la tension d'alimentation de ce démarreur et on coupe le démarreur lorsque cette tension atteint une valeur seuil, caractérisé en ce que cette valeur seuil est fonction de la valeur de la tension d'alimentation en début de démarrage.To this end, it proposes a method for controlling the shutdown of a motor vehicle starter, according to which the supply voltage of this starter is measured and the starter is cut off when this voltage reaches a threshold value, characterized in that this threshold value is a function of the value of the supply voltage at the start of starting.

L'invention propose également un dispositif pour la mise en oeuvre de ce procédé.The invention also provides a device for implementing this method.

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

  • la figure 1 est un schéma d'un dispositif de commande de coupure d'un démarreur conforme à un mode de réalisation possible pour l'invention ;
  • la figure 2 est un schéma synoptique sur lequel on a illustré un mode de réalisation possible pour les moyens de commande du dispositif de la figure 1.
Other characteristics and advantages of the invention will emerge from the description which follows. This description is purely illustrative and not limiting. It must be read in conjunction with the appended drawings in which:
  • Figure 1 is a diagram of a cut-off control device of a starter according to a possible embodiment for the invention;
  • FIG. 2 is a block diagram on which a possible embodiment for the control means of the device in FIG. 1 has been illustrated.

On a illustré sur la figure 1 un dispositif pour la commande de l'alimentation d'un démarreur D. Classiquement, un tel démarreur est un moteur électrique monté entre une borne d'alimentation B+ à la tension de la batterie du véhicule et la masse.Is illustrated in Figure 1 a device for controlling the supply of a starter D. Conventionally, such a starter is an electric motor mounted between a B + power supply terminal at the vehicle battery voltage and earth.

Ce dispositif comporte un contacteur 1 monté entre la borne B+ d'alimentation à la tension de la batterie et le démarreur D.This device comprises a contactor 1 mounted between the terminal B + of supply to the battery voltage and the starter D.

Ce contacteur 1 est un relais actionné par un bobinage 2. L'une des extrémités de ce bobinage 2 est reliée à la borne d'alimentation B+. Son autre extrémité est reliée d'une part à la source d'un transistor MOSFET 3 et d'autre part à un bobinage 5 relié à la masse.This contactor 1 is a relay actuated by a winding 2. One of the ends of this winding 2 is connected to the supply terminal B + . Its other end is connected on the one hand to the source of a MOSFET transistor 3 and on the other hand to a coil 5 connected to ground.

Le drain du transistor 3 est relié à la borne d'alimentation B+. Sa grille est reliée à la sortie d'une unité 4, dont elle reçoit une tension de commande.The drain of transistor 3 is connected to the supply terminal B + . Its gate is connected to the output of a unit 4, from which it receives a control voltage.

Bien entendu, le transistor 3 pourrait être remplacé par tout autre type d'interrupteur.Of course, the transistor 3 could be replaced by any other type of switch.

Dans l'exemple illustré sur ces figures, l'unité 4 génère ladite tension de commande en fonction d'une part de la tension de la borne d'alimentation B+, et d'autre part de la position du contacteur actionné par la clé de contact (contacteur 6).In the example illustrated in these figures, the unit 4 generates said control voltage as a function on the one hand of the voltage of the supply terminal B + , and on the other hand of the position of the contactor actuated by the key contact (contactor 6).

Les moyens de commande de l'unité 4 sont représentés schématiquement sur la figure 2.The control means of the unit 4 are shown diagrammatically in FIG. 2.

L'unité 4 comporte des moyens 7 pour mesurer la tension de la borne B+ d'alimentation du démarreur D (tension Ubat).The unit 4 comprises means 7 for measuring the voltage of the terminal B + of supply of the starter D (voltage U bat ).

Il comporte également des moyens 8 pour mémoriser la tension U0 de cette borne B+ au début du démarrage, c'est-à-dire lorsque la clé de contact ferme le contacteur 6.It also includes means 8 for memorizing the voltage U 0 of this terminal B + at the start of starting, that is to say when the ignition key closes the contactor 6.

De façon particulièrement préférentielle, la mesure initiale intervient suffisamment tôt pour que la tension U0 corresponde à la tension de la batterie avant toute chute de tension.In a particularly preferred manner, the initial measurement takes place sufficiently early so that the voltage U 0 corresponds to the voltage of the battery before any voltage drop.

La tension de la borne d'alimentation B+ est ensuite mesurée en permanence pendant toute la phase de démarrage.The voltage of the supply terminal B + is then continuously measured during the entire phase of start-up.

La tension Ubat ainsi mesurée est comparée par un comparateur 9 à une valeur Uf de fin de démarrage qui est fonction de la valeur de U0.The voltage U bat thus measured is compared by a comparator 9 to a value U f of end of starting which is a function of the value of U 0 .

Dans un mode de mise en oeuvre avantageux, Uf est tel que Uf = k.U0, avec k inférieur ou égal à 1.In an advantageous embodiment, U f is such that U f = kU 0 , with k less than or equal to 1.

La valeur de k est par exemple choisie en fonction de la tension batterie moyenne en fin de démarrage, pour un niveau donné du moteur thermique.The value of k is for example chosen as a function of the average battery voltage at the end of starting, for a given level of the heat engine.

Tant que Ubat est inférieur à cette valeur seuil Uf, le blocage du transistor 3 est inhibé.As long as U bat is less than this threshold value U f , the blocking of transistor 3 is inhibited.

Le transistor 3 étant fermé, le bobinage 2 est court-circuité et le contacteur 1 est lui-même fermé.The transistor 3 being closed, the winding 2 is short-circuited and the contactor 1 is itself closed.

Lorsque Ubat devient supérieur à Uf, le blocage du transistor 3 n'est plus inhibé. Le bobinage 2 n'est plus court-circuité et le contacteur 1 est ouvert. Le démarreur D est alors coupé.When U bat becomes greater than U f , the blocking of transistor 3 is no longer inhibited. The winding 2 is no longer short-circuited and the contactor 1 is open. The starter D is then cut.

Bien entendu, les moyens qui constituent l'unité 4 peuvent être soit analogiques, soit numériques.Of course, the means which constitute the unit 4 can be either analog or digital.

Comme on l'aura compris, la solution proposée par l'invention permet de réduire systématiquement la durée du démarrage au juste nécessaire. En particulier, cette solution permet de s'affranchir des variations de la tension de la batterie et en particulier de celles qui sont dues aux variations de température.As will be understood, the solution proposed by the invention makes it possible to systematically reduce the start-up time to the minimum necessary. In particular, this solution makes it possible to overcome variations in the voltage of the battery and in particular those which are due to variations in temperature.

Le confort de l'usager en est amélioré. A terme, il devient possible d'envisager d'alléger ou de simplifier la partie lanceur du démarreur en supprimant la fonction roue libre.User comfort is improved. Ultimately, it becomes possible to consider lightening or simplifying the starter part of the starter by eliminating the freewheeling function.

Par ailleurs, la solution proposée présente l'avantage d'être entièrement autonome et de ne nécessiter aucun câblage supplémentaire lors de l'installation sur le véhicule.Furthermore, the proposed solution has the advantage of being entirely autonomous and of not requiring any additional wiring during installation on the vehicle.

L'ensemble constitué par un dispositif de commande du type proposé par l'invention et son alternateur est en effet interchangeable avec un démarreur classique.The assembly constituted by a control device of the type proposed by the invention and its alternator is indeed interchangeable with a conventional starter.

On notera également que le courant au niveau du contacteur 6 de la clé est d'un niveau très bas : quelques milliampères au lieu des valeurs habituelles de 10 à 40 ampères. De ce fait, le démarreur proposé par l'invention peut être traité comme un organe de commande à faible courant, ce qui permet d'envisager de nombreuses évolutions de la commande de démarrage, par exemple : commande par entrée de codes, par la pédale d'accélération, etc.It will also be noted that the current at the contactor 6 of the key is of a very low level: a few milliamps instead of the usual values of 10 to 40 amps. Therefore, the starter proposed by the invention can be treated as a low current control member, which makes it possible to envisage numerous changes to the start control, for example: control by code entry, by the pedal. acceleration, etc.

Claims (7)

Procédé pour la commande de la coupure d'un démarreur de véhicule automobile selon lequel on mesure la tension d'alimentation de ce démarreur et on coupe le démarreur lorsque cette tension atteint une valeur seuil (Uf), caractérisé en ce que cette valeur seuil est fonction de la valeur (U0) de la tension d'alimentation en début de démarrage.Method for controlling the shutdown of a motor vehicle starter, according to which the supply voltage of this starter is measured and the starter is cut off when this voltage reaches a threshold value (U f ), characterized in that this threshold value is a function of the value (U 0 ) of the supply voltage at the start of start-up. Procédé selon la revendication 1, caractérisé en ce que la tension d'alimentation U0 en début de démarrage est la tension de la batterie avant toute chute de tension.Method according to claim 1, characterized in that the supply voltage U 0 at the start of start-up is the battery voltage before any voltage drop. Procédé selon la revendication 2, caractérisé en ce que la valeur seuil est une valeur de tension Uf qui correspond à k.U0, où k ≤ 1.Method according to claim 2, characterized in that the threshold value is a voltage value U f which corresponds to kU 0 , where k ≤ 1. Dispositif pour la commande de la coupure d'un démarreur de véhicule automobile comportant des moyens (7) pour mesurer la tension d'alimentation du démarreur, ainsi que des moyens (9) de comparaison de la valeur ainsi mesurée à une valeur de tension seuil (Uf), caractérisé en ce qu'il comporte des moyens pour mémoriser la valeur de la tension mesurée en début de démarrage, la valeur seuil étant fonction de la valeur (U0) de la tension d'alimentation en début de démarrage.Device for controlling the shutdown of a motor vehicle starter comprising means (7) for measuring the starter supply voltage, as well as means (9) for comparing the value thus measured with a threshold voltage value (U f ), characterized in that it comprises means for memorizing the value of the voltage measured at the start of start-up, the threshold value being a function of the value (U 0 ) of the supply voltage at the start of start-up. Dispositif selon la revendication 4, caractérisé en ce que la tension d'alimentation U0 en début de démarrage est la tension de la batterie avant toute chute de tension.Device according to claim 4, characterized in that the supply voltage U 0 at the start of starting is the voltage of the battery before any voltage drop. Dispositif selon la revendication 5, caractérisé en ce que la valeur seuil est une valeur tension Uf qui correspond à k.U0 où k ≤ 1.Device according to claim 5, characterized in that the threshold value is a voltage value U f which corresponds to kU 0 where k ≤ 1. Dispositif selon l'une des revendications 4 à 6, caractérisé en ce qu'il comporte une unité (4) qui commande un contacteur qui commande lui-même l'alimentation du démarreur (D), ladite unité de commande (4) étant reliée d'une part à une borne d'alimentation (B+) du démarreur (D) et d'autre part à un contacteur (6) actionné par la clé de contact.Device according to one of claims 4 to 6, characterized in that it comprises a unit (4) which controls a contactor which itself controls the supply of the starter (D), said control unit (4) being connected on the one hand to a supply terminal (B + ) of the starter (D) and on the other hand to a contactor (6) actuated by the ignition key.
EP97400626A 1996-03-21 1997-03-20 Power cut-off system for motor vehicle starter Expired - Lifetime EP0814258B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9603511 1996-03-21
FR9603511A FR2746450B1 (en) 1996-03-21 1996-03-21 SHUTDOWN OF A MOTOR VEHICLE STARTER

Publications (2)

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EP0814258A1 true EP0814258A1 (en) 1997-12-29
EP0814258B1 EP0814258B1 (en) 2001-08-16

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US (1) US5905315A (en)
EP (1) EP0814258B1 (en)
JP (1) JPH1026065A (en)
KR (1) KR970066076A (en)
DE (1) DE69706101T2 (en)
FR (1) FR2746450B1 (en)

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EP0814258B1 (en) 2001-08-16
US5905315A (en) 1999-05-18
DE69706101D1 (en) 2001-09-20
FR2746450B1 (en) 1998-06-12
FR2746450A1 (en) 1997-09-26
KR970066076A (en) 1997-10-13
JPH1026065A (en) 1998-01-27
DE69706101T2 (en) 2002-05-02

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