EP0922855B1 - Improvements to devices for controlling a starter for automotive vehicles - Google Patents

Improvements to devices for controlling a starter for automotive vehicles Download PDF

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Publication number
EP0922855B1
EP0922855B1 EP19980403119 EP98403119A EP0922855B1 EP 0922855 B1 EP0922855 B1 EP 0922855B1 EP 19980403119 EP19980403119 EP 19980403119 EP 98403119 A EP98403119 A EP 98403119A EP 0922855 B1 EP0922855 B1 EP 0922855B1
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EP
European Patent Office
Prior art keywords
voltage
starter
supply
residual
ripples
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EP19980403119
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German (de)
French (fr)
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EP0922855A1 (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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    • 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
    • F02N11/10—Safety devices
    • F02N11/101—Safety devices for preventing engine starter actuation or engagement
    • F02N11/105—Safety devices for preventing engine starter actuation or engagement when the engine is already running

Definitions

  • the present invention relates to devices for the control of a motor vehicle starter.
  • Devices for the electronic control of a starter are now classically known. They usually have a management unit that receives as input information on the open or closed state of the start switch - which is usually activated by an ignition key - and control the supply of the winding (s) of a contactor power which, when closed, provides power of the electric starter motor.
  • This contactor of power notably includes a mobile core which, at the end stroke, closes the motor supply circuit electric starter and whose movement causes the engagement of the starter gear towards the crown of start-up.
  • This management unit is also used to manage other functions, such as automatic shutdown starter or protections against overcurrents or against false operations, such as a request to start while the engine is already in operation.
  • This management unit is either integrated into the starter itself, or housed outside the starter in a special box. In another variant, it can be constituted by an electronic system already existing such as the injection computer and ignition.
  • Damage of frontal tooth profiles causes difficulty in penetrating the pinion during subsequent starts.
  • the teeth of the pinion generally harder than those of the crown, act as a milling tool, which in short expires, deteriorates the crown and renders it useless.
  • Replacing the starter or the crown generally requires removal of the engine and is therefore a very expensive operation.
  • the noise emitted by the engine running warns the driver of his operating condition; this is why the risk of false maneuver consisting in operating the starter when the engine is running is enough low.
  • a device of this type is for example described in US 4,415,812.
  • Comparisons to voltage thresholds can be frequently faulted by the variety of situations encountered on a vehicle and the multiplicity parameters that can modify the voltages on which comparisons are implemented (state of battery charge, current consumption, temperature ambient, ...)
  • the invention in turn provides a device for the control of a motor vehicle starter comprising electronic means which manage the starter supply depending in particular on the closed or open state of the start switch, characterized in that said electronic means include means for detecting on a voltage issued of the vehicle network voltage of the ripples residuals corresponding to the undulations present on the voltage at the output of the alternator rectifier bridge when the vehicle's engine is running, as well as means to block the control of starter power when these ripples residuals are detected.
  • Residual ripples present on the voltage at the output of the alternator rectifier bridge are very weak, but have the advantage of being present everywhere on the vehicle's electrical network, and in particular input of electronic starter control cards.
  • the invention also relates to a starter for motor vehicle, characterized in that it comprises a device of the aforementioned type.
  • a motor is shown electric motor starter M as well that the power contactor 1 which controls the power supply of this motor M.
  • This electric motor M is mounted between earth and a + BAT terminal at voltage power supply.
  • the power contactor 1 is constituted by a relay which includes a contact 1a, which is interposed between the supply terminal + BAT and the motor M, as well than a winding B with one or more windings.
  • This coil B is mounted in series with a T1 controlled switch between earth and a "u" terminal which is itself connected to the + Bat terminal by via the start switch 3 of the vehicle (which is usually operated by a key of contact).
  • the switch T1 is for example a transistor of MOSFET type, the grid of which is voltage-controlled by a management unit 2.
  • the voltage sent to the analog input “e 0 " is also injected at the input of a circuit 4 allowing the detection on the supply voltage received by the terminal "u", of residual ripples corresponding to the ripples at the output of the alternator rectifier bridge.
  • This circuit 4 includes in series a module F of filtering, an amplification module A and a module I of value extraction. Its output is connected to a second analog input "e1" of microprocessor 3, which according to the voltage level on said command input or not blocking of transistor T1.
  • the filter module F is a bandpass filter intended to eliminate on the voltage received on the one hand the DC component of this voltage and secondly the high frequency noise that this voltage can present.
  • the lower limit of the filter made by this module F is less than the frequency of the rotating alternator in slow motion.
  • the upper limit is higher than the frequency of the alternator running at its maximum speed.
  • the signal at the output of this module F contains essentially the residual ripple of the alternator.
  • This signal is amplified in module A to be easily exploitable.
  • Module I processes the amplified signal to extract a value which is then injected on the input "e1" of the microprocessor, where it is converted numerically. For example, module I extracts the value mean, or the rms value or the value of peak of the amplified residual signal.
  • one of the first operations of microprocessor 2 is to read the value of the voltage present on "e1" and at the compare to a predetermined threshold.
  • the threshold value is chosen to be higher that residual parasites having an origin other than the alternator, such as switching noises electric motors operating during start-up (pump fuel, motor fans, ). The existence of this threshold avoids confusion of extraneous noise with the signal generated by the alternator.
  • the threshold is chosen lower than the minimum residual ripple level of the alternator.
  • the microprocessor then blocks the transistor T1 which controls contactor 1 and thus prevents all starter operation.
  • circuit 4 A possible embodiment for circuit 4 is illustrated in figure 2.
  • the filtering module F is a passive band pass filter made by two RC circuits.
  • the terminal "u" is connected to a first capacitor C1 there, whose end opposite to said terminal is connected to the ground via a first resistance R1.
  • the capacitor C1 and the resistance R1 are connected to a second resistance R2 which is connected at its other end to a second capacitor C2 mounted between said resistor R2 and the mass.
  • Module A consists of an amplifier with fixed gain. It includes an operational amplifier A1 mounted in non-inverting voltage reaction (input inverters connected to the amplifier output operational A1 by resistance R3 and to earth by resistance R4.
  • the module I illustrated in FIG. 2 makes it possible to collect the peak voltage of the amplified signal. It is consisting of a diode D1 mounted between the output of the amplification module A and the input "e1", being passing from said exit to said entry, as well as by a capacitor C3 mounted between the cathode of said diode D1 and ground.
  • microprocessor 2 can be replaced by analog circuits.
  • electronic means can be placed outside the starter.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Motor And Converter Starters (AREA)
  • Control Of Direct Current Motors (AREA)
  • Control Of Eletrric Generators (AREA)

Description

La présente invention est relative aux dispositifs pour la commande d'un démarreur de véhicule automobile.The present invention relates to devices for the control of a motor vehicle starter.

Des dispositifs pour la commande électronique d'un démarreur sont désormais classiquement connus. Ils comportent habituellement une unité de gestion qui reçoit en entrée une information sur l'état ouvert ou fermé de l'interrupteur de démarrage - lequel est généralement actionné par une clé de contact - et commande l'alimentation du ou des bobinages d'un contacteur de puissance qui, lorsqu'il est fermé, assure l'alimentation du moteur électrique du démarreur. Ce contacteur de puissance comporte notamment un noyau mobile qui, en fin de course, ferme le circuit d'alimentation du moteur électrique du démarreur et dont le déplacement entraíne l'engagement du pignon de démarreur vers la couronne de démarrage. Cette unité de gestion sert également à gérer d'autres fonctions, comme l'arrêt automatique du démarreur ou encore les protections contre les surintensités ou contre les fausses manoeuvres, telles qu'une demande de démarrage alors que le moteur thermique est déjà en fonctionnement. Cette unité de gestion est soit intégrée au démarreur lui-même, soit logée hors du démarreur dans un boítier spécial. En variante encore, elle peut être constituée par un système électronique déjà existant tel que le calculateur d'injection et d'allumage.Devices for the electronic control of a starter are now classically known. They usually have a management unit that receives as input information on the open or closed state of the start switch - which is usually activated by an ignition key - and control the supply of the winding (s) of a contactor power which, when closed, provides power of the electric starter motor. This contactor of power notably includes a mobile core which, at the end stroke, closes the motor supply circuit electric starter and whose movement causes the engagement of the starter gear towards the crown of start-up. This management unit is also used to manage other functions, such as automatic shutdown starter or protections against overcurrents or against false operations, such as a request to start while the engine is already in operation. This management unit is either integrated into the starter itself, or housed outside the starter in a special box. In another variant, it can be constituted by an electronic system already existing such as the injection computer and ignition.

Il peut arriver que le conducteur, par inadvertance, actionne le démarreur de son véhicule alors que le moteur de celui-ci est déjà en marche. Le pignon du démarreur est alors propulsé contre la couronne tournante mais ne peut pénétrer. Il en résulte une détérioration et une usure très rapide des faces frontales des dentures du pignon et de la couronne.It may happen that the driver inadvertently actuates the starter of his vehicle while the engine of it is already running. The starter gear is then propelled against the rotating crown but does not can penetrate. This results in deterioration and very rapid wear of the front faces of the teeth of the pinion and crown.

L'endommagement des profils frontaux de dentures entraíne des difficultés de pénétration du pignon lors des démarrages ultérieurs. Les dents du pignon, généralement plus dures que celles de la couronne, agissent comme un outil de fraisage, ce qui, à brève échéance, détériore la couronne et la rend hors d'usage. Or, le remplacement du démarreur ou de la couronne nécessite généralement la dépose du moteur thermique et constitue donc une opération très coûteuse.Damage of frontal tooth profiles causes difficulty in penetrating the pinion during subsequent starts. The teeth of the pinion, generally harder than those of the crown, act as a milling tool, which in short expires, deteriorates the crown and renders it useless. Replacing the starter or the crown generally requires removal of the engine and is therefore a very expensive operation.

Le bruit émis par le moteur thermique tournant prévient le conducteur de son état de fonctionnement ; c'est pourquoi le risque de fausse manoeuvre consistant à actionner le démarreur quand le moteur tourne est assez faible.The noise emitted by the engine running warns the driver of his operating condition; this is why the risk of false maneuver consisting in operating the starter when the engine is running is enough low.

Cependant, pour les véhicules disposant d'un moteur à faible niveau sonore ou d'une insonorisation performante, ce qui est la tendance générale pour les nouveaux véhicules, le risque s'accroít considérablement.However, for vehicles with an engine low noise or soundproofing which is the general trend for new vehicles, the risk increases considerably.

Pour limiter l'importance de ce problème, il existe des clés de contact à verrouillage mécanique qui lorsque l'on veut redémarrer, nécessitent un mouvement de rotation de la clé d'abord dans un sens pour retourner sur la position « arrêt » puis en sens inverse pour atteindre la position « commande de démarrage » via la position « marche ». Il en résulte un effet de détrompage qui peut alerter le conducteur et empêcher ainsi une fausse manoeuvre du démarreur.To limit the importance of this problem, there are mechanically locked ignition keys which when we want to restart, require a movement of first turn the key in one direction to return in the “stop” position then in the opposite direction to reach the "start command" position via the "on" position. This results in a polarizing effect which can alert the driver and thus prevent a wrong starter operation.

Toutefois, cette protection mécanique n'est obtenue qu'au prix d'une grande complexité de la clé de contact, ce qui induit :

  • une augmentation du prix de la clé de contact,
  • une réduction de la fiabilité du système du fait des composants supplémentaires,
  • un encombrement supplémentaire.
However, this mechanical protection is only obtained at the cost of great complexity of the ignition key, which induces:
  • an increase in the price of the ignition key,
  • a reduction in the reliability of the system due to the additional components,
  • additional space.

Par ailleurs, la protection assurée par de tels moyens de verrouillage mécanique n'est pas non plus totalement fiable. Par exemple, il peut arriver que le conducteur croyant avoir calé son moteur, accomplisse très rapidement les mouvements de clé pour passer à la position arrêt, puis à la position démarrage. Dans ce cas, le moteur thermique n'ayant pas eu le temps de s'arrêter, continue à tourner pendant que le démarreur est réactivé.Furthermore, the protection provided by such mechanical locking means is also not totally reliable. For example, it may happen that the driver believing to have stalled his engine very quickly the key movements to move to the stop position, then start position. In this case, the engine did not have time to stop, keep turning while the starter is reactivated.

On connaít également des dispositifs de protection électroniques qui empêchent la commande du démarreur lorsque le moteur thermique est lancé. Ces dispositifs, plus performants que les systèmes mécaniques, réalisent une détection de l'état de fonctionnement dans lequel se trouve le moteur thermique en mettant en oeuvre soit des comparaisons de la tension d'alimentation du démarreur par rapport à des seuils prédéterminés, soit une analyse de signaux alternatifs de la ou des phases de l'induit de l'alternateur, avant redressement.We also know protective devices electronics that prevent starter control when the engine is started. These devices, more efficient than mechanical systems, realize a detection of the operating state in which find the engine by implementing either starter supply voltage comparisons in relation to predetermined thresholds, i.e. an analysis of alternating signals of the armature phase (s) the alternator, before rectification.

Un dispositif de ce type est par exemple décrit dans US 4 415 812.A device of this type is for example described in US 4,415,812.

Toutefois, ces détections ne sont pas non plus pleinement satisfaisantes.However, these detections are also not fully satisfactory.

Les comparaisons à des seuils de tension peuvent être fréquemment mises en défaut par la variété des situations rencontrées sur un véhicule et la multiplicité des paramètres qui peuvent modifier les tensions sur lesquelles les comparaisons sont mises en oeuvre (état de charge de batterie, intensité consommée, température ambiante,...)Comparisons to voltage thresholds can be frequently faulted by the variety of situations encountered on a vehicle and the multiplicity parameters that can modify the voltages on which comparisons are implemented (state of battery charge, current consumption, temperature ambient, ...)

Quant aux détections mises en oeuvre sur les tensions en sortie de l'alternateur, elles nécessitent de ménager une prise de tension sur l'alternateur et d'amener cette tension jusqu'au circuit électronique de commande du démarreur. Il en résulte une électronique complexe et des surcoûts importants.As for the detections implemented on the alternator output voltages, they require provide a voltage tap on the alternator and to bring this voltage up to the electronic circuit of starter control. This results in electronics complex and significant additional costs.

On connaít déjà par EP 793 014 une détection du démarrage du moteur thermique d'un véhicule qui consiste à suivre les oscillations de la tension d'alimentation du moteur et à générer un signal indiquant que le moteur thermique a démarré lorsque ces oscillations ont disparu. Une telle détection n'empêche pas le conducteur d'actionner le démarreur de son véhicule alors que le moteur de celui-ci est déjà en marche.We already know from EP 793 014 a detection of starting the heat engine of a vehicle which consists to follow the oscillations of the supply voltage of the engine and generate a signal that the engine thermal started when these oscillations disappeared. Such detection does not prevent the driver activate the starter of his vehicle while the engine of it is already running.

L'invention propose quant à elle un dispositif pour la commande d'un démarreur de véhicule automobile comportant des moyens électroniques qui gèrent l'alimentation du démarreur en fonction notamment de l'état fermé ou ouvert de l'interrupteur de démarrage, caractérisé en ce que lesdits moyens électroniques comportent des moyens pour détecter sur une tension issue de la tension réseau du véhicule des ondulations résiduelles correspondant aux ondulations présentent sur la tension en sortie du pont redresseur de l'alternateur lorsque le moteur thermique du véhicule est en marche, ainsi que des moyens pour bloquer la commande de l'alimentation du démarreur lorsque ces ondulations résiduelles sont détectées.The invention in turn provides a device for the control of a motor vehicle starter comprising electronic means which manage the starter supply depending in particular on the closed or open state of the start switch, characterized in that said electronic means include means for detecting on a voltage issued of the vehicle network voltage of the ripples residuals corresponding to the undulations present on the voltage at the output of the alternator rectifier bridge when the vehicle's engine is running, as well as means to block the control of starter power when these ripples residuals are detected.

Les ondulations résiduelles présentes sur la tension en sortie du pont redresseur de l'alternateur sont très faibles, mais ont l'avantage d'être présentes partout sur le réseau électrique du véhicule, et en particulier en entrée des cartes électroniques de commande du démarreur.Residual ripples present on the voltage at the output of the alternator rectifier bridge are very weak, but have the advantage of being present everywhere on the vehicle's electrical network, and in particular input of electronic starter control cards.

Par conséquent, un tel dispositif ne nécessite aucune prise d'information externe au démarreur.Therefore, such a device does not require no information external to the starter.

En outre, avec un tel dispositif, la protection contre le démarrage moteur tournant est assurée dans toutes les configurations de fonctionnement du circuit de charge et des circuits consommateurs du véhicule.In addition, with such a device, the protection against starting the engine running is ensured in all operating configurations of the load and consumer circuits of the vehicle.

Ce dispositif est avantageusement complété par les différentes caractéristiques suivantes prises seules ou selon toutes leurs combinaisons techniquement possibles :

  • les moyens de détection des ondulations résiduelles comportent des moyens de filtrage de type passe-bande destiné à éliminer sur la tension reçue d'une part la composante continue de cette tension et d'autre part les parasites à fréquences élevées que cette tension peut présenter.
  • la fréquence basse des moyens de filtrage est inférieure à la fréquence de l'alternateur tournant au ralenti et sa fréquence haute est supérieure à la fréquence de l'alternateur tournant à son régime maximum.
  • les moyens de détection des ondulations résiduelles comportent en série avec les moyens de filtrage des moyens d'amplification et des moyens d'extraction d'une tension dont la valeur est représentative de la présence ou non d'ondulations résiduelles.
  • les moyens d'extraction extraient la valeur moyenne et/ou la valeur efficace et/ou la valeur de crête du signal résiduel amplifié.
  • les moyens électroniques comportent des moyens pour comparer à un seuil la tension en sortie des moyens d'extraction et pour bloquer la commande de l'alimentation du démarreur lorsque ladite tension est supérieure audit seuil.
  • les moyens qui comparent à un seuil la tension en sortie des moyens d'extraction sont constitués par un microprocesseur qui reçoit en entrée la tension en sortie desdits moyens d'extraction.
  • la tension reçue par les moyens de détection des ondulations résiduelles est la tension d'alimentation des moyens électroniques de gestion de l'alimentation du démarreur.
This device is advantageously supplemented by the following different characteristics taken alone or in all their technically possible combinations:
  • the residual ripple detection means comprise filter means of bandpass type intended to eliminate on the received voltage on the one hand the DC component of this voltage and on the other hand the high frequency interference that this voltage can present.
  • the low frequency of the filtering means is less than the frequency of the alternator idling and its high frequency is greater than the frequency of the alternator rotating at its maximum speed.
  • the means for detecting residual ripples comprise in series with the filtering means amplification means and means for extracting a voltage whose value is representative of the presence or absence of residual ripples.
  • the extraction means extract the mean value and / or the rms value and / or the peak value of the amplified residual signal.
  • the electronic means include means for comparing the voltage at the output of the extraction means with a threshold and for blocking the control of the starter supply when said voltage is greater than said threshold.
  • the means which compare the output voltage of the extraction means with a threshold are constituted by a microprocessor which receives the input voltage at the output of said extraction means.
  • the voltage received by the residual ripple detection means is the supply voltage of the electronic starter power management means.

L'invention concerne également un démarreur de véhicule automobile, caractérisé en ce qu'il comporte un dispositif du type précité.The invention also relates to a starter for motor vehicle, characterized in that it comprises a 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 qui doit être lue en regard des dessins annexés sur lesquels :

  • la figure 1 est une représentation schématique d'un dispositif de commande conforme à un mode de réalisation possible de l'invention.
  • la figure 2 est un schéma illustrant un exemple de réalisation possible pour les moyens de détection des ondulations résiduelles.
Other characteristics and advantages of the invention will emerge from the following description which is purely illustrative and not limiting and which should be read with reference to the appended drawings in which:
  • Figure 1 is a schematic representation of a control device according to a possible embodiment of the invention.
  • FIG. 2 is a diagram illustrating a possible embodiment for the means for detecting residual ripples.

Sur la figure 1, on a représenté un moteur électrique M d'un démarreur de véhicule automobile, ainsi que le contacteur de puissance 1 qui commande l'alimentation de ce moteur M. Ce moteur électrique M est monté entre la masse et une borne + BAT à la tension d'alimentation de la batterie.In Figure 1, a motor is shown electric motor starter M as well that the power contactor 1 which controls the power supply of this motor M. This electric motor M is mounted between earth and a + BAT terminal at voltage power supply.

Le contacteur de puissance 1 est constitué par un relais qui comprend un contact 1a, qui est interposé entre la borne d'alimentation +BAT et le moteur M, ainsi qu'un bobinage B à un ou plusieurs enroulements.The power contactor 1 is constituted by a relay which includes a contact 1a, which is interposed between the supply terminal + BAT and the motor M, as well than a winding B with one or more windings.

Ce bobinage B est monté en série avec un interrupteur commandé T1 entre la masse et une borne "u" qui est elle même reliée à la borne +Bat par l'intermédiaire de l'interrupteur de démarrage 3 du véhicule (lequel est habituellement actionné par une clé de contact).This coil B is mounted in series with a T1 controlled switch between earth and a "u" terminal which is itself connected to the + Bat terminal by via the start switch 3 of the vehicle (which is usually operated by a key of contact).

L'interrupteur T1 est par exemple un transistor de type MOSFET, dont la grille est commandée en tension par une unité de gestion 2.The switch T1 is for example a transistor of MOSFET type, the grid of which is voltage-controlled by a management unit 2.

Cette unité de gestion 2 est constituée par un microprocesseur dont une entrée analogique "e0" est reliée à la borne "u" et qui assure différentes fonctions :

  • analyse de l'état ouvert ou fermé de l'interrupteur de démarrage 3 et gestion de la séquence d'alimentation du moteur M en fonction de cette information ;
  • arrêt automatique du démarreur lorsque le moteur thermique est démarré ;
  • protection du démarreur contre d'éventuelles surcharges ou fausses manoeuvres.
This management unit 2 is constituted by a microprocessor of which an analog input "e 0 " is connected to the terminal "u" and which performs various functions:
  • analysis of the open or closed state of the start switch 3 and management of the supply sequence of the motor M as a function of this information;
  • automatic starter stop when the engine is started;
  • protection of the starter against possible overloads or false operations.

La tension envoyée sur l'entrée analogique "e0" est en outre injectée en entrée d'un circuit 4 permettant la détection sur la tension d'alimentation reçue par la borne "u", d'ondulations résiduelles correspondant aux ondulations en sortie du pont redresseur de l'alternateur.The voltage sent to the analog input "e 0 " is also injected at the input of a circuit 4 allowing the detection on the supply voltage received by the terminal "u", of residual ripples corresponding to the ripples at the output of the alternator rectifier bridge.

Ce circuit 4 comprend en série un module F de filtrage, un module A d'amplification et un module I d'extraction de valeur. Sa sortie est reliée à une deuxième entrée analogique "e1" du microprocesseur 3, qui selon le niveau de la tension sur ladite entrée commande ou non le blocage du transistor T1.This circuit 4 includes in series a module F of filtering, an amplification module A and a module I of value extraction. Its output is connected to a second analog input "e1" of microprocessor 3, which according to the voltage level on said command input or not blocking of transistor T1.

Le module de filtrage F est un filtre passe-bande destiné à éliminer sur la tension reçue d'une part la composante continue de cette tension et d'autre part les parasites à fréquences élevées que cette tension peut présenter.The filter module F is a bandpass filter intended to eliminate on the voltage received on the one hand the DC component of this voltage and secondly the high frequency noise that this voltage can present.

La limite basse du filtre que réalise ce module F est inférieure à la fréquence de l'alternateur tournant au ralenti. La limite haute est supérieure à la fréquence de l'alternateur tournant à son régime maximum.The lower limit of the filter made by this module F is less than the frequency of the rotating alternator in slow motion. The upper limit is higher than the frequency of the alternator running at its maximum speed.

Le signal en sortie de ce module F contient essentiellement l'ondulation résiduelle de l'alternateur.The signal at the output of this module F contains essentially the residual ripple of the alternator.

Ce signal est amplifié dans le module A pour être facilement exploitable.This signal is amplified in module A to be easily exploitable.

Le module I traite le signal amplifié pour en extraire une valeur qui est ensuite injectée sur l'entrée "e1" du microprocesseur, où elle est convertie numériquement. Par exemple, le module I extrait la valeur moyenne, ou la valeur efficace ou encore la valeur de crête du signal résiduel amplifié. Module I processes the amplified signal to extract a value which is then injected on the input "e1" of the microprocessor, where it is converted numerically. For example, module I extracts the value mean, or the rms value or the value of peak of the amplified residual signal.

A la fermeture de la clé de contact 3, une des premières opérations du microprocesseur 2 consiste à lire la valeur de la tension présente sur « e1 » et à la comparer à un seuil prédéterminé.When the ignition key 3 is closed, one of the first operations of microprocessor 2 is to read the value of the voltage present on "e1" and at the compare to a predetermined threshold.

La valeur du seuil est choisie pour être plus élevée que les parasites résiduels ayant une origine autre que l'alternateur, tels que les bruits de commutation des moteurs électriques fonctionnant lors du démarrage (pompe à carburant, motoventilateurs,...). L'existence de ce seuil évite la confusion des bruits parasites avec le signal généré par l'alternateur.The threshold value is chosen to be higher that residual parasites having an origin other than the alternator, such as switching noises electric motors operating during start-up (pump fuel, motor fans, ...). The existence of this threshold avoids confusion of extraneous noise with the signal generated by the alternator.

Bien évidemment, le seuil est choisi inférieur au niveau d'ondulation résiduelle minimale de l'alternateur.Obviously, the threshold is chosen lower than the minimum residual ripple level of the alternator.

La présence sur l'entrée "e1" d'une tension supérieure à ce seuil signifie que l'alternateur débite et, par conséquent, que le moteur thermique tourne.The presence on the input "e1" of a voltage above this threshold means that the alternator charges and therefore the engine is running.

Le microprocesseur bloque alors le transistor T1 qui commande le contacteur 1 et empêche ainsi tout fonctionnement du démarreur.The microprocessor then blocks the transistor T1 which controls contactor 1 and thus prevents all starter operation.

Par contre, si la tension sur l'entrée "e1" est inférieure au seuil, la commande du contacteur est autorisée.On the other hand, if the voltage on the input "e1" is below the threshold, the contactor control is authorized.

Un exemple de réalisation possible pour le circuit 4 est illustré sur la figure 2.A possible embodiment for circuit 4 is illustrated in figure 2.

Dans cet exemple, le module F de filtrage est un filtre passe bande passif réalisé par deux circuits RC. La borne "u" y est reliée à un premier condensateur C1, dont l'extrémité opposée à ladite borne est reliée à la masse par l'intermédiaire d'une première résistance R1. A leur extrémité commune, le condensateur C1 et la résistance R1 sont reliées à une deuxième résistance R2 qui est reliée à son autre extrémité à un deuxième condensateur C2 monté entre ladite résistance R2 et la masse. In this example, the filtering module F is a passive band pass filter made by two RC circuits. The terminal "u" is connected to a first capacitor C1 there, whose end opposite to said terminal is connected to the ground via a first resistance R1. AT their common end, the capacitor C1 and the resistance R1 are connected to a second resistance R2 which is connected at its other end to a second capacitor C2 mounted between said resistor R2 and the mass.

Le module A est constitué par un amplificateur à gain fixe. Il comporte un amplificateur opérationnel A1 monté en réaction de tension non inverseuse (entrée inverseuse reliée à la sortie de l'amplificateur opérationnel A1 par une résistance R3 et à la masse par une résistance R4.Module A consists of an amplifier with fixed gain. It includes an operational amplifier A1 mounted in non-inverting voltage reaction (input inverters connected to the amplifier output operational A1 by resistance R3 and to earth by resistance R4.

Le module I illustré sur la figure 2 permet de recueillir la tension de crête du signal amplifié. Il est constitué par une diode D1 montée entre la sortie du module d'amplification A et l'entrée "e1", en étant passante de ladite sortie vers ladite entrée, ainsi que par un condensateur C3 monté entre la cathode de ladite diode D1 et la masse.The module I illustrated in FIG. 2 makes it possible to collect the peak voltage of the amplified signal. It is consisting of a diode D1 mounted between the output of the amplification module A and the input "e1", being passing from said exit to said entry, as well as by a capacitor C3 mounted between the cathode of said diode D1 and ground.

D'autres variantes de réalisation que celles qui viennent d'être décrites peuvent bien entendu être envisagées.Other variant embodiments than those which just described can of course be considered.

En particulier, le microprocesseur 2 peut être remplacé par des circuits analogiques.In particular, the microprocessor 2 can be replaced by analog circuits.

En outre, les moyens électroniques (microprocesseur 3, circuit 4) peuvent être placés hors du démarreur.In addition, electronic means (microprocessor 3, circuit 4) can be placed outside the starter.

Claims (9)

  1. Device for controlling a motor vehicle starter, comprising electronic means (2, 4) which control the supply to the starter according in particular to the closed or open state of the starter switch (3), characterised in that the said electronic means comprise means (4) for detecting, on a voltage issuing from the vehicle system voltage, residual ripples corresponding to the ripples present on the voltage output from the alternator rectifier bridge when the thermal engine of the vehicle is running, as well as means (2) for blocking the control of the supply to the starter when these residual ripples are detected.
  2. Device according to Claim 1, characterised in that the means (4) of detecting the residual ripples comprise filtering means (F) of the band-pass type intended to eliminate, on the voltage received, on the one hand the DC component of this voltage and on the other hand any high-frequency parasitics which this voltage may exhibit.
  3. Device according to Claim 2, characterised in that the low frequency of the filtering means (F) is lower than the frequency of the alternator rotating at tick-over and in that its high frequency is higher than the frequency of the alternator rotating at maximum speed.
  4. Device according to one of Claims 2 or 3, characterised in that the means (4) of detecting the residual ripples comprise, in series with the filtering means (F), amplification means (A) and means (I) of extracting a voltage whose value represents the presence or not of residual ripples.
  5. Device according to Claim 4, characterised in that the extraction means (I) extract the average value and/or the effective value and/or the peak value of the amplified residual voltage.
  6. Device according to one of Claims 4 and 5, characterised in that the electronic means comprise means (2) of comparing with a threshold the voltage output from the extraction means and for blocking the control of the supply to the starter when the said voltage is higher than the said threshold.
  7. Device according to Claim 6, characterised in that the means which compare with a threshold the voltage output from the extraction means consist of a microprocessor (2) which receives as an input the voltage output from the said extraction means.
  8. Device according to one of the preceding claims, characterised in that the voltage received by the means (4) of detecting the residual ripples is the supply voltage to the electronic means controlling the supply to the starter.
  9. Motor vehicle starter, characterised in that it comprises a device according to one of the preceding claims.
EP19980403119 1997-12-10 1998-12-10 Improvements to devices for controlling a starter for automotive vehicles Expired - Lifetime EP0922855B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9715617A FR2772085B1 (en) 1997-12-10 1997-12-10 IMPROVEMENT IN DEVICES FOR CONTROLLING A MOTOR VEHICLE STARTER
FR9715617 1997-12-10

Publications (2)

Publication Number Publication Date
EP0922855A1 EP0922855A1 (en) 1999-06-16
EP0922855B1 true EP0922855B1 (en) 2003-02-05

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Application Number Title Priority Date Filing Date
EP19980403119 Expired - Lifetime EP0922855B1 (en) 1997-12-10 1998-12-10 Improvements to devices for controlling a starter for automotive vehicles

Country Status (4)

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EP (1) EP0922855B1 (en)
DE (1) DE69811193T2 (en)
ES (1) ES2192757T3 (en)
FR (1) FR2772085B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018144672A1 (en) * 2017-02-01 2018-08-09 Borgwarner Inc. System and method for detecting an operating motor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2797536B1 (en) * 1999-08-09 2001-11-02 Valeo Equip Electr Moteur DEVICE FOR CONTROLLING THE POWER SUPPLY OF A HEAT ENGINE STARTER, ESPECIALLY A MOTOR VEHICLE
FR2982911B1 (en) * 2011-11-18 2013-11-15 Valeo Equip Electr Moteur ELECTRICAL STARTER WITH ELECTRONIC INTEGRATED FILTER FOR INTERNAL COMBUSTION ENGINE

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4415812A (en) * 1982-01-11 1983-11-15 General Motors Corporation Electric starting system
IT1285276B1 (en) * 1996-02-28 1998-06-03 Fiat Ricerche DEVICE FOR DETECTING THE STARTING OF AN INTERNAL COMBUSTION ENGINE
FR2746449B1 (en) * 1996-03-21 1998-06-12 Valeo Equip Electr Moteur METHOD AND DEVICE FOR CONTROLLING A POWER CONTACTOR OF A MOTOR VEHICLE STARTER

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018144672A1 (en) * 2017-02-01 2018-08-09 Borgwarner Inc. System and method for detecting an operating motor

Also Published As

Publication number Publication date
FR2772085A1 (en) 1999-06-11
FR2772085B1 (en) 2000-02-25
ES2192757T3 (en) 2003-10-16
DE69811193T2 (en) 2003-09-25
EP0922855A1 (en) 1999-06-16
DE69811193D1 (en) 2003-03-13

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