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EP2089630A1 - Method for controlling a stop and automatic restart device for a thermal engine - Google Patents

Method for controlling a stop and automatic restart device for a thermal engine

Info

Publication number
EP2089630A1
EP2089630A1 EP07866520A EP07866520A EP2089630A1 EP 2089630 A1 EP2089630 A1 EP 2089630A1 EP 07866520 A EP07866520 A EP 07866520A EP 07866520 A EP07866520 A EP 07866520A EP 2089630 A1 EP2089630 A1 EP 2089630A1
Authority
EP
European Patent Office
Prior art keywords
temperature
engine
alternator
storage means
predetermined temperature
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.)
Ceased
Application number
EP07866520A
Other languages
German (de)
French (fr)
Inventor
Philippe Jourdes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP2089630A1 publication Critical patent/EP2089630A1/en
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F02N11/0814—Circuits or control means specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
    • F02N11/0818—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode
    • F02N11/0825—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode related to prevention of engine restart failure, e.g. disabling automatic stop at low battery state
    • 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
    • F02N11/04—Starting of engines by means of electric motors the motors being associated with current generators
    • 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
    • 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
    • F02N2200/04—Parameters used for control of starting apparatus said parameters being related to the starter motor
    • F02N2200/045—Starter temperature or parameters related to 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
    • 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
    • F02N2200/061—Battery state of charge [SOC]
    • 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
    • F02N2200/064—Battery temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the present invention relates to a method for controlling a device for automatically stopping and restarting the engine of a vehicle, in particular a motor vehicle.
  • a device for stopping and restarting the engine hereinafter referred to as "A & R device” and designated by "Stop & Start in English).
  • the engine stop is automatically controlled whenever the vehicle speed is practically zero and the engine automatically restarts following a need expressed by the driver (for example action on the accelerator pedal or release of the brake pedal) or following a need of the vehicle (for example to maintain the temperature of certain elements, to maintain heating in the cabin in winter or air conditioning in summer or to maintain the temperature of the catalyst and therefore its effectiveness).
  • the device A & R comprises a logic circuit connected to sensors controlling the occurrence of certain conditions and if one or more of these conditions appear, the device A & R controls either stopping the engine (by cutting off the fuel injection by example), or restarting the engine when the engine is stopped.
  • the restart is carried out through an electrotechnical chain comprising electrical energy storage means connected to a reversible alternator, itself connected to the crankshaft of the engine by a system of pulleys and transmission belt.
  • the electrical energy storage means may consist of one or more batteries or a super capacity.
  • the storage means, as well as the various electrical equipment of the vehicle, are powered by the alternator when the latter is driven by the engine (transformation of mechanical energy into electrical energy).
  • the alternator operates in an electric motor, powered by the storage means, it actuates the rotation of the crankshaft (transformation of electrical energy into mechanical energy).
  • the engine can be started by the alternator.
  • the patent application FR 2 816 891 filed by the applicant describes a control system for starting and automatic shutdown of a vehicle engine.
  • a calculator containing a motor control algorithm operates according to the following parameters: vehicle speed, gear speed engaged, clutch position, engine speed, engine temperature, vehicle inclination, door switch, and vehicle lock. 'alternator.
  • the device described in this patent application works properly, it has the disadvantage of not taking into account the elements of the electrotechnical chain. In extreme or critical conditions, the performance of the alternator or storage means may not be sufficient to ensure the restart of the engine. These elements are then oversized in order to be able to restart the motor, whatever the conditions, which leads to an additional cost of these elements and a larger footprint. However, these critical conditions only occur in about 10% of the total driving time of the vehicle.
  • the present invention is to detect these critical conditions and to inhibit the A & R function when these conditions occur. This avoids the oversizing of the alternator and storage means of the electrical energy and thus realizes savings in cost, weight and space of this equipment.
  • the invention relates to a method for controlling a device for automatically stopping and restarting a thermal engine of a vehicle comprising means for storing electrical energy and a reversible alternator connected to the engine.
  • the method comprises: comparing the temperature of the alternator to a first predetermined temperature,
  • the temperature of the alternator is advantageously that of its stator.
  • the first predetermined temperature is between 1 1 0 0 C and 150 ° C, preferably about 130 ° C; the predetermined threshold of the charge level is less than 90%, preferably approximately 80%, of the maximum charge level;
  • the second predetermined temperature is between -15 ° C. and + 5 ° C., preferably close to -1 ° C.
  • said two conditions are taken into account to inhibit or not the automatic restart of the engine.
  • the automatic stopping of the motor is inhibited if the temperature of the alternator is higher than the first predetermined temperature and if at least one of the two conditions relating to the storage means appears. .
  • FIG. a diagram illustrating the process according to the invention.
  • the device for automatically stopping and restarting a controlled or piloted thermal engine comprises sensors, a logic circuit, a reversible alternator (able to operate as a current generator or an electric motor) and storage means. 'electric energy. These can consist of one or more battery (s) or a "super capacity" (capacitor large capacity), charged (s) by the alternator when the latter operates as a current generator.
  • the sensors are temperature probes, one dedicated to the stator temperature and the other to the storage means (preferably the internal temperature of the storage means), as well as a voltmeter and / or ammeter controlling the charge level. storage means. These sensors are connected to the logic circuit, which contains in memory a control algorithm of the device, this algorithm including the steps of the method of the invention.
  • the temperature of the alternator can also be controlled by the temperature of the rotor. For this, the rotor being fed by a DC voltage, the intensity of the current flowing in the rotor is measured. The temperature of the rotor is determined from the intensity of the current.
  • steps 10, 12 and 14 of the method are carried out using a logic circuit. preferably a microprocessor.
  • the step 10 of the method consists in detecting the internal temperature of the alternator, the step 12 in detecting the internal temperature of the storage means and the step 14 in detecting the state of charge of the electrical energy storage means.
  • Step 16 is to compare:
  • the predetermined threshold is expressed as a percentage of the maximum charge value, the latter corresponding to the fully charged electrical energy storage means.
  • step 18 it is determined whether at least one of the critical conditions has been obtained. If this is not the case, the automatic shutdown and restart function of the heat engine is not inhibited (step 20). If this is the case, it is determined in step 22 whether the engine is stopped. If the engine is not stopped, it is forbidden to stop the engine by the A & R function (step 24). If the engine is stopped, it is forbidden to stop the engine by the A & R function and the engine is restarted using the traditional starter (step 26).
  • step 18 is then returned to determine again if at least one of the critical conditions is reached.
  • the values of the first and second temperatures, as well as the load threshold of the storage means depend on the characteristics of the heat engine. For example, a diesel engine requires more torque for startup. With equal capacity of electrical energy storage means, the critical level of load threshold for a diesel engine will be predetermined at a higher value than for a gasoline engine. However, it is possible to indicate the following values: the first critical temperature (of the alternator) can be between 110 ° C. and 150 ° C., preferably close to 130 ° C. the second critical temperature (storage means) can be between -15 ° C and + 5 ° C, preferably close to -10 ° C, and the load threshold level of the storage means can be less than or equal to 90%, preferably close to 80%.
  • the combination of the different parameters between them is important for determining the critical values. For example, if only one of the parameters reaches a value within the range of critical values mentioned above (for example from 110 ° C. to 150 ° C. for the alternator temperature), the critical value for this parameter may be chosen at a high value in the field (for example 140 0 C). On the other hand, if two or three of the parameters reach values located in the different critical value ranges, it will be possible to predetermine more severe critical values (for example, 0 ° C. for the critical temperature of the storage means and 12 ° C. for the temperature). critical of the alternator). On average we can for example take the value of 13O 0 C for the first temperature (critical temperature of the alternator), -1 O 0 C for the second temperature (temperature of the energy storage means) and a threshold of load level of 80% for storage means.
  • step 10 it is possible to take into account only the temperature of the alternator (step 10) and only one of the two steps 12 and 14 concerning the storage means of the electrical energy, respectively the temperature and the level of charge.
  • the invention makes it possible to optimize the design of the alternator and the electrical energy storage means, by dimensioning these elements at the nominal operating conditions and no longer to satisfy all the operating conditions (in particular under extreme conditions, for example). example -20 ° C for a battery). This optimizes the cost of these elements according to the desired performance of the device A & R. The robustness of the starts with the A & R function is increased thanks to the control of the critical conditions.
  • the invention also makes it possible to limit the power of the reversible alternator in starter mode and thus to reduce the intensity of the electric current that it consumes. The voltage at the terminals of the various electrical equipment of the vehicle is therefore more stable, which limits the dimensioning of the system whose function is to maintain substantially constant electrical voltage at the terminals of these electrical equipment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Abstract

The invention relates to a method for controlling a stop and automatic restart device for a thermal engine of a vehicle, comprising electric energy storage means and a reversible alternator connected to the thermal engine. The method comprises: comparing (16, 18) the temperature of the alternator (10) with a first predetermined temperature detecting (16, 18) the occurrence of at least one of the two following conditions concerning the electric energy storage means: a temperature (12) lower that a second predetermined temperature and a charge level (14) lower than a predetermined threshold; and if the alternator temperature is higher than the first predetermined temperature and if at least one of said two conditions occurs, inhibiting (26) the automatic restart of the engine.

Description

Procédé de commande d'un dispositif d'arrêt et de redémarrage automatique d'un moteur thermique Method of controlling a device for stopping and automatically restarting a heat engine
La présente invention revendique la priorité de la demande française 0654903 déposée le 15/1 1/2006 dont le contenu (description, revendications et dessins) est incorporé ici par référence.The present invention claims the priority of the French application 0654903 filed on 15/1 1/2006 whose content (description, claims and drawings) is incorporated herein by reference.
La présente invention concerne un procédé de commande d'un dispositif d'arrêt et de redémarrage automatique du moteur thermique d'un véhicule, notamment d'un véhicule automobile. De façon à limiter la consommation de carburant et la pollution des moteurs thermiques, certains véhicules sont équipés d'un dispositif d'arrêt et de redémarrage du moteur thermique (ci-après « dispositif A&R » et désigné par « Stop & Start en anglais). L'arrêt du moteur est commandé automatiquement chaque fois que la vitesse du véhicule est pratiquement nulle et le moteur redémarre automatiquement suite à un besoin exprimé par le conducteur (par exemple action sur la pédale d'accélérateur ou relâchement de la pédale de frein) ou suite à un besoin du véhicule (par exemple pour maintenir la température de certains éléments, pour maintenir le chauffage dans l'habitacle en hiver ou la climatisation en été ou pour maintenir la température du catalyseur et donc son efficacité).The present invention relates to a method for controlling a device for automatically stopping and restarting the engine of a vehicle, in particular a motor vehicle. In order to limit the fuel consumption and pollution of heat engines, some vehicles are equipped with a device for stopping and restarting the engine (hereinafter referred to as "A & R device" and designated by "Stop & Start in English). . The engine stop is automatically controlled whenever the vehicle speed is practically zero and the engine automatically restarts following a need expressed by the driver (for example action on the accelerator pedal or release of the brake pedal) or following a need of the vehicle (for example to maintain the temperature of certain elements, to maintain heating in the cabin in winter or air conditioning in summer or to maintain the temperature of the catalyst and therefore its effectiveness).
Le dispositif A&R comporte un circuit logique relié à des capteurs contrôlant l'apparition de certaines conditions et si l'une ou plusieurs de ces conditions apparaissent, le dispositif A&R commande soit l'arrêt du moteur (par coupure de l'injection de carburant par exemple), soit le redémarrage du moteur lorsque ce dernier est arrêté. Le redémarrage est effectué grâce à une chaîne électrotechnique comprenant des moyens de stockage d'énergie électrique reliés à un alternateur réversible, lui-même relié au vilebrequin du moteur par un système de poulies et de courroie de transmission. Les moyens de stockage d'énergie électrique peuvent être constitués par une ou plusieurs batteries ou par une super capacité. Les moyens de stockage, ainsi que les divers équipements électriques du véhicule, sont alimentés par l'alternateur lorsque ce dernier est entraîné par le moteur thermique (transformation d'énergie mécanique en énergie électrique). Lorsque l'alternateur fonctionne en moteur électrique, alimenté par les moyens de stockage, il actionne la rotation du vilebrequin (transformation d'énergie électrique en énergie mécanique). Le moteur thermique peut ainsi être mis en marche par l'alternateur.The device A & R comprises a logic circuit connected to sensors controlling the occurrence of certain conditions and if one or more of these conditions appear, the device A & R controls either stopping the engine (by cutting off the fuel injection by example), or restarting the engine when the engine is stopped. The restart is carried out through an electrotechnical chain comprising electrical energy storage means connected to a reversible alternator, itself connected to the crankshaft of the engine by a system of pulleys and transmission belt. The electrical energy storage means may consist of one or more batteries or a super capacity. The storage means, as well as the various electrical equipment of the vehicle, are powered by the alternator when the latter is driven by the engine (transformation of mechanical energy into electrical energy). When the alternator operates in an electric motor, powered by the storage means, it actuates the rotation of the crankshaft (transformation of electrical energy into mechanical energy). The engine can be started by the alternator.
La demande de brevet FR 2 816 891 déposée par la demanderesse décrit un système de commande de démarrage et d'arrêt automatique d'un moteur thermique de véhicule. Un calculateur contenant un algorithme de commande du moteur agit en fonction des paramètres suivants : vitesse du véhicule, rapport de vitesse enclenché, position de l'embrayage, régime du moteur, température du moteur, inclinaison du véhicule, contacteur de portière et blocage de l'alternateur. Bien que le dispositif décrit dans cette demande de brevet fonctionne correctement, il présente l'inconvénient de ne pas tenir compte des éléments de la chaîne électrotechnique. En conditions extrêmes ou critiques, les performances de l'alternateur ou des moyens de stockage peuvent ne pas être suffisantes pour assurer le redémarrage du moteur thermique. On surdimensionne alors ces éléments de façon à pouvoir redémarrer le moteur, pratiquement quelque soient les conditions, ce qui induit un coût supplémentaire de ces éléments et un encombrement plus important. Cependant, ces conditions critiques ne se produisent que d'en environ 10% du temps total de roulage du véhicule.The patent application FR 2 816 891 filed by the applicant describes a control system for starting and automatic shutdown of a vehicle engine. A calculator containing a motor control algorithm operates according to the following parameters: vehicle speed, gear speed engaged, clutch position, engine speed, engine temperature, vehicle inclination, door switch, and vehicle lock. 'alternator. Although the device described in this patent application works properly, it has the disadvantage of not taking into account the elements of the electrotechnical chain. In extreme or critical conditions, the performance of the alternator or storage means may not be sufficient to ensure the restart of the engine. These elements are then oversized in order to be able to restart the motor, whatever the conditions, which leads to an additional cost of these elements and a larger footprint. However, these critical conditions only occur in about 10% of the total driving time of the vehicle.
La présente invention consiste à détecter ces conditions critiques et à inhiber la fonction A&R lorsque ces conditions se produisent. On évite ainsi le surdimensionnement de l'alternateur et des moyens de stockage de l'énergie électrique et on réalise donc des économies en coût, en poids et en encombrement de ces équipements.The present invention is to detect these critical conditions and to inhibit the A & R function when these conditions occur. This avoids the oversizing of the alternator and storage means of the electrical energy and thus realizes savings in cost, weight and space of this equipment.
De façon plus précise, l'invention concerne un procédé de commande d'un dispositif d'arrêt et de redémarrage automatique d'un moteur thermique d'un véhicule comportant des moyens de stockage d'énergie électrique et un alternateur réversible relié au moteur thermique. Selon l'invention, le procédé consiste : - à comparer la température de l'alternateur à une première température prédéterminée,More specifically, the invention relates to a method for controlling a device for automatically stopping and restarting a thermal engine of a vehicle comprising means for storing electrical energy and a reversible alternator connected to the engine. . According to the invention, the method comprises: comparing the temperature of the alternator to a first predetermined temperature,
- à détecter l'apparition d'au moins l'une des deux conditions suivantes relatives aux moyens de stockage d'énergie électrique : une température inférieure à une deuxième température prédéterminée et un niveau de charge inférieur à un seuil prédéterminé, et- Detecting the occurrence of at least one of the following two conditions relating to the electrical energy storage means: a temperature below a predetermined second temperature and a charge level below a predetermined threshold, and
- si la température de l'alternateur est supérieure à la première température prédéterminée et si au moins l'une desdites conditions apparaît, à inhiber le redémarrage automatique du moteur. La température de l'alternateur est avantageusement celle de son stator.- if the temperature of the alternator is higher than the first predetermined temperature and if at least one of said conditions appears, to inhibit the automatic restart of the engine. The temperature of the alternator is advantageously that of its stator.
De préférence :Preferably:
- la première température prédéterminée est comprise entre 1 1 O0C et 150°C, de préférence environ 13O0C ; - le seuil prédéterminé du niveau de charge est inférieur à 90%, de préférence environ 80%, du niveau de charge maximal ;the first predetermined temperature is between 1 1 0 0 C and 150 ° C, preferably about 130 ° C; the predetermined threshold of the charge level is less than 90%, preferably approximately 80%, of the maximum charge level;
- la deuxième température prédéterminée est comprise entre -150C et + 50C, de préférence voisine de -1 O0C.the second predetermined temperature is between -15 ° C. and + 5 ° C., preferably close to -1 ° C.
Selon un mode de réalisation préféré de l'invention, on tient compte des dites deux conditions pour inhiber ou non le redémarrage automatique du moteur.According to a preferred embodiment of the invention, said two conditions are taken into account to inhibit or not the automatic restart of the engine.
Avantageusement, en plus d'inhiber le redémarrage du moteur, l'arrêt automatique du moteur est inhibé si la température de l'alternateur est supérieure à la première température prédéterminée et si au moins l'une desdites deux conditions relatives aux moyens de stockage apparaît.Advantageously, in addition to inhibiting the restarting of the motor, the automatic stopping of the motor is inhibited if the temperature of the alternator is higher than the first predetermined temperature and if at least one of the two conditions relating to the storage means appears. .
D'autres avantages et caractéristiques de l'invention apparaîtront au cours de la description qui suit d'un mode de réalisation de l'invention, donné à titre d'exemple non limitatif, en référence au dessin annexé et sur lequel la figure 1 est un diagramme illustrant le procédé selon l'invention. Le dispositif d'arrêt et de redémarrage automatique d'un moteur thermique commandé ou piloté selon l'invention comporte des capteurs, un circuit logique, un alternateur réversible (pouvant fonctionner en générateur de courant ou en moteur électrique) et des moyens de stockage d'énergie électrique. Ces derniers peuvent être constitués d'une ou plusieurs batterie(s) ou d'une « super capacité » (condensateur de capacité importante), chargée(s) par l'alternateur lorsque ce dernier fonctionne en générateur de courant. Les capteurs sont des sondes de température, l'une dédiée à la température du stator et l'autre aux moyens de stockage (de préférence température interne des moyens de stockage), ainsi qu'un voltmètre et/ou ampèremètre contrôlant le niveau de charge des moyens de stockage. Ces capteurs sont reliés au circuit logique, lequel contient en mémoire un algorithme de commande du dispositif, cet algorithme incluant les étapes du procédé de l'invention. La température de l'alternateur peut également être contrôlée par la température du rotor. Pour cela, le rotor étant alimenté par une tension continue, on mesure l'intensité du courant circulant dans le rotor. La température du rotor est déterminée à partir de l'intensité du courant.Other advantages and features of the invention will become apparent from the following description of an embodiment of the invention, given by way of non-limiting example, with reference to the appended drawing and in which FIG. a diagram illustrating the process according to the invention. The device for automatically stopping and restarting a controlled or piloted thermal engine according to the invention comprises sensors, a logic circuit, a reversible alternator (able to operate as a current generator or an electric motor) and storage means. 'electric energy. These can consist of one or more battery (s) or a "super capacity" (capacitor large capacity), charged (s) by the alternator when the latter operates as a current generator. The sensors are temperature probes, one dedicated to the stator temperature and the other to the storage means (preferably the internal temperature of the storage means), as well as a voltmeter and / or ammeter controlling the charge level. storage means. These sensors are connected to the logic circuit, which contains in memory a control algorithm of the device, this algorithm including the steps of the method of the invention. The temperature of the alternator can also be controlled by the temperature of the rotor. For this, the rotor being fed by a DC voltage, the intensity of the current flowing in the rotor is measured. The temperature of the rotor is determined from the intensity of the current.
Les différentes étapes du procédé représentées sur la figure 1 (à l'exception des détections de température et de niveau de charge, ci-après étapes 10, 12 et 14 du procédé) sont mises en œuvre à l'aide d'un circuit logique, de préférence un microprocesseur. L'étape 10 du procédé consiste à détecter la température interne de l'alternateur, l'étape 12 à détecter la température interne des moyens de stockage et I'étape14 à détecter l'état de charge des moyens de stockage en énergie électrique.The different process steps shown in FIG. 1 (with the exception of the temperature and charge level detections, hereinafter steps 10, 12 and 14 of the method) are carried out using a logic circuit. preferably a microprocessor. The step 10 of the method consists in detecting the internal temperature of the alternator, the step 12 in detecting the internal temperature of the storage means and the step 14 in detecting the state of charge of the electrical energy storage means.
L'étape 16 consiste à comparer :Step 16 is to compare:
- la température de l'alternateur à une première température prédéterminée et si la température de l'alternateur est supérieure à la première température, on obtient une première condition critique ; - la température des moyens de stockage à une deuxième température prédéterminée et si la température des moyens de stockage est inférieure à la deuxième température, on obtient une deuxième condition critique ;the temperature of the alternator at a first predetermined temperature and if the temperature of the alternator is higher than the first temperature, a first critical condition is obtained; the temperature of the storage means at a second predetermined temperature and if the temperature of the storage means is lower than the second temperature, a second critical condition is obtained;
- le niveau de charge des moyens de stockage à un seuil prédéterminé et si le niveau de charge est inférieur à ce seuil, on obtient une troisième condition critique. Le seuil prédéterminé est exprimé en pourcentage de la valeur maximale de charge, cette dernière correspondant aux moyens de stockage d'énergie électrique complètement chargés.the charge level of the storage means at a predetermined threshold and if the charge level is below this threshold, a third critical condition is obtained. The predetermined threshold is expressed as a percentage of the maximum charge value, the latter corresponding to the fully charged electrical energy storage means.
On notera que, dans les domaines de température habituellement rencontrées pour un alternateur en fonctionnement et pour des moyens de stockage en énergie électrique, l'efficacité de l'alternateur diminue lorsque la température augmente, alors qu'à l'inverse, l'efficacité des moyens de stockage d'énergie électrique diminue lorsque la température diminue (par exemple, l'efficacité d'une batterie diminue fortement pour des températures négatives).It will be noted that, in the temperature ranges usually encountered for an alternator in operation and for electrical energy storage means, the efficiency of the alternator decreases when the temperature increases, whereas, conversely, the efficiency electrical energy storage means decreases when the temperature decreases (for example, the efficiency of a battery greatly decreases for negative temperatures).
A l'étape 18, on détermine si au moins l'une des conditions critiques a été obtenue. Si ce n'est pas le cas, la fonction A&R d'arrêt et de redémarrage automatique du moteur thermique n'est pas inhibée (étape 20). Si c'est le cas, on détermine à l'étape 22 si le moteur est arrêté. Si le moteur n'est pas arrêté, on interdit l'arrêt du moteur par la fonction A&R (étape 24). Si le moteur est arrêté, on interdit l'arrêt du moteur par la fonction A&R et le moteur thermique est redémarré à l'aide du démarreur traditionnel (étape 26).In step 18, it is determined whether at least one of the critical conditions has been obtained. If this is not the case, the automatic shutdown and restart function of the heat engine is not inhibited (step 20). If this is the case, it is determined in step 22 whether the engine is stopped. If the engine is not stopped, it is forbidden to stop the engine by the A & R function (step 24). If the engine is stopped, it is forbidden to stop the engine by the A & R function and the engine is restarted using the traditional starter (step 26).
Le procédé est mis en oeuvre continuellement pendant le roulage du véhicule. Après chacune des étapes 20, 24 et 26, on revient donc à l'étape 18 pour déterminer à nouveau si au moins l'une des conditions critiques est atteinte.The process is carried out continuously during the running of the vehicle. After each of steps 20, 24 and 26, step 18 is then returned to determine again if at least one of the critical conditions is reached.
Les valeurs des première et deuxième températures, ainsi que le seuil de charge des moyens de stockage, dépendent des caractéristiques du moteur thermique. Par exemple, un moteur Diesel nécessite plus de couple pour le démarrage. A capacité égale des moyens de stockage d'énergie électrique, le niveau critique de seuil de charge pour un moteur Diesel sera prédéterminé à une valeur plus élevée que pour un moteur à essence. On peut cependant indiquer les valeurs suivantes : la première température critique (de l'alternateur) peut être comprise entre 1 10°C et 1500C, de préférence voisine de 1300C ; la deuxième température critique (des moyens de stockage) peut être comprise entre -15°C et +5°C, de préférence voisine de -10°C, et le niveau de seuil de charge des moyens de stockage peut être inférieur ou égal à 90%, de préférence voisin de 80%. La combinaison des différents paramètres entre eux est importante pour déterminer les valeurs critiques. Par exemple, si seul l'un des paramètres atteint une valeur comprise dans la plage de valeurs critiques citées plus haut (par exemple de 1 100C à 1500C pour la température de l'alternateur), la valeur critique pour ce paramètre pourra être choisie à une valeur élevée dans le domaine (par exemple 1400C). Par contre, si deux ou trois des paramètres atteignent des valeurs situées dans les différents domaines de valeurs critiques, on pourra prédéterminer des valeurs critiques plus sévères (par exemple O0C pour la température critique des moyens de stockage et 12O0C pour la température critique de l'alternateur). En moyenne on peut par exemple prendre la valeur de 13O0C pour la première température (température critique de l'alternateur), -1 O0C pour la deuxième température (température des moyens de stockage de l'énergie) et un seuil du niveau de charge de 80% pour les moyens de stockage.The values of the first and second temperatures, as well as the load threshold of the storage means, depend on the characteristics of the heat engine. For example, a diesel engine requires more torque for startup. With equal capacity of electrical energy storage means, the critical level of load threshold for a diesel engine will be predetermined at a higher value than for a gasoline engine. However, it is possible to indicate the following values: the first critical temperature (of the alternator) can be between 110 ° C. and 150 ° C., preferably close to 130 ° C. the second critical temperature (storage means) can be between -15 ° C and + 5 ° C, preferably close to -10 ° C, and the load threshold level of the storage means can be less than or equal to 90%, preferably close to 80%. The combination of the different parameters between them is important for determining the critical values. For example, if only one of the parameters reaches a value within the range of critical values mentioned above (for example from 110 ° C. to 150 ° C. for the alternator temperature), the critical value for this parameter may be chosen at a high value in the field (for example 140 0 C). On the other hand, if two or three of the parameters reach values located in the different critical value ranges, it will be possible to predetermine more severe critical values (for example, 0 ° C. for the critical temperature of the storage means and 12 ° C. for the temperature). critical of the alternator). On average we can for example take the value of 13O 0 C for the first temperature (critical temperature of the alternator), -1 O 0 C for the second temperature (temperature of the energy storage means) and a threshold of load level of 80% for storage means.
Selon un mode simplifié de mise en œuvre du procédé, on peut ne prendre en compte que la température de l'alternateur (étape 10) et seulement l'une des deux étapes 12 et 14 concernant les moyens de stockage de l'énergie électrique, respectivement la température et le niveau de charge. On peut également ne considérer que le redémarrage du moteur, pour les moteurs munis d'un démarreur traditionnel. Dans ce cas, si la fonction A&R arrête le moteur malgré le fait que l'une des conditions critiques est atteinte, le moteur peut être redémarré à l'aide du démarreur et non plus avec l'alternateur.According to a simplified mode of implementation of the method, it is possible to take into account only the temperature of the alternator (step 10) and only one of the two steps 12 and 14 concerning the storage means of the electrical energy, respectively the temperature and the level of charge. One can also consider only the restart of the engine, for engines equipped with a traditional starter. In this case, if the A & R function stops the engine despite the fact that one of the critical conditions is reached, the engine can be restarted using the starter and no longer with the alternator.
L'invention permet d'optimiser le dimensionnement de l'alternateur et des moyens de stockage d'énergie électrique, en dimensionnant ces éléments aux conditions nominales de fonctionnement et non plus pour satisfaire à toutes les conditions de fonctionnement (notamment aux conditions extrêmes, par exemple -20°C pour une batterie). On optimise ainsi le coût de ces éléments en fonction des performances souhaitées du dispositif A&R. La robustesse des démarrages avec la fonction A&R est augmentée grâce à la maîtrise des conditions critiques. L'invention permet également de limiter la puissance de l'alternateur réversible en mode démarreur et donc de diminuer l'intensité du courant électrique qu'il consomme. La tension électrique aux bornes des différents équipements électriques du véhicule est donc plus stable, ce qui permet de limiter le dimensionnement du système qui a pour fonction de maintenir sensiblement constante la tension électrique aux bornes de ces équipements électriques.The invention makes it possible to optimize the design of the alternator and the electrical energy storage means, by dimensioning these elements at the nominal operating conditions and no longer to satisfy all the operating conditions (in particular under extreme conditions, for example). example -20 ° C for a battery). This optimizes the cost of these elements according to the desired performance of the device A & R. The robustness of the starts with the A & R function is increased thanks to the control of the critical conditions. The invention also makes it possible to limit the power of the reversible alternator in starter mode and thus to reduce the intensity of the electric current that it consumes. The voltage at the terminals of the various electrical equipment of the vehicle is therefore more stable, which limits the dimensioning of the system whose function is to maintain substantially constant electrical voltage at the terminals of these electrical equipment.
D'autres modes de réalisation que ceux décrits et représentés peuvent être conçus par l'homme du métier sans sortir du cadre de la présente invention. Embodiments other than those described and shown may be devised by those skilled in the art without departing from the scope of the present invention.

Claims

REVENDICATIONS
1. Procédé de commande d'un dispositif d'arrêt et de redémarrage automatique d'un moteur thermique d'un véhicule comportant des moyens de stockage d'énergie électrique et un alternateur réversible relié au moteur thermique, caractérisé en ce qu'il consiste :1. A method for controlling a device for automatically stopping and restarting a thermal engine of a vehicle comprising means for storing electrical energy and a reversible alternator connected to the heat engine, characterized in that it consists of :
- à comparer (16, 18) la température de l'alternateur (10) à une première température prédéterminée,- comparing (16, 18) the temperature of the alternator (10) to a first predetermined temperature,
- à détecter (16, 18) l'apparition d'au moins l'une des deux conditions suivantes relatives aux moyens de stockage d'énergie électrique : une température (12) inférieure à une deuxième température prédéterminée et un niveau de charge (14) inférieur à un seuil prédéterminé, etin detecting (16, 18) the occurrence of at least one of the following two conditions relating to the electrical energy storage means: a temperature (12) lower than a second predetermined temperature and a charge level (14); ) less than a predetermined threshold, and
- si la température de l'alternateur est supérieure à la première température prédéterminée et si au moins l'une desdites deux conditions apparaît, à inhiber (26) le redémarrage automatique du moteur.- if the temperature of the alternator is higher than the first predetermined temperature and if at least one of said two conditions appears, to inhibit (26) the automatic restart of the engine.
2. Procédé selon la revendication 1 caractérisé en ce que la température de l'alternateur est celle de son stator.2. Method according to claim 1 characterized in that the temperature of the alternator is that of its stator.
3. Procédé selon l'une des revendications précédentes caractérisé en ce que la première température prédéterminée est comprise entre 110°C et 1500C et le seuil prédéterminé du niveau de charge est inférieur à 90% du niveau de charge maximal.3. Method according to one of the preceding claims characterized in that the first predetermined temperature is between 110 ° C and 150 0 C and the predetermined threshold of the charge level is less than 90% of the maximum charge level.
4. Procédé selon la revendication 3 caractérisé en ce que la première température prédéterminée est d'environ 1300C et le seuil prédéterminé du niveau de charge est d'environ 80% du niveau de charge maximal.4. A method according to claim 3 characterized in that the first predetermined temperature is about 130 0 C and the predetermined threshold load level is about 80% of the maximum charge level.
5. Procédé selon l'une des revendications précédentes caractérisé en ce que la deuxième température prédéterminée est comprise entre -15°C et + 5O.5. Method according to one of the preceding claims characterized in that the second predetermined temperature is between -15 ° C and + 50.
6. Procédé selon la revendication 5 caractérisé en ce que la deuxième température prédéterminée est voisine de -100C. 6. Method according to claim 5 characterized in that the second predetermined temperature is close to -10 0 C.
7. Procédé selon l'une des revendications précédentes caractérisé en ce qu'on tient compte des deux dites conditions (12, 14) pour inhiber ou non le redémarrage automatique du moteur.7. Method according to one of the preceding claims characterized in that account is taken of both said conditions (12, 14) to inhibit or not the automatic restart of the engine.
8. Procédé selon l'une des revendications précédentes caractérisé en ce qu'en plus d'inhiber le redémarrage du moteur, l'arrêt automatique du moteur est inhibé (24) si la température de l'alternateur est supérieure à la première température prédéterminée et si au moins l'une desdites deux conditions relatives aux moyens de stockage apparaît. 8. Method according to one of the preceding claims characterized in that in addition to inhibiting the restart of the engine, the automatic engine stop is inhibited (24) if the temperature of the alternator is greater than the first predetermined temperature and if at least one of said two conditions relating to the storage means appears.
EP07866520A 2006-11-15 2007-10-30 Method for controlling a stop and automatic restart device for a thermal engine Ceased EP2089630A1 (en)

Applications Claiming Priority (2)

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FR0654903A FR2908477B1 (en) 2006-11-15 2006-11-15 METHOD FOR CONTROLLING A DEVICE FOR AUTOMATICALLY STOPPING AND RESTARTING A THERMAL MOTOR
PCT/FR2007/052278 WO2008059152A1 (en) 2006-11-15 2007-10-30 Method for controlling a stop and automatic restart device for a thermal engine

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EP2089630A1 true EP2089630A1 (en) 2009-08-19

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US8047173B2 (en) 2011-11-01
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WO2008059152A1 (en) 2008-05-22
FR2908477B1 (en) 2009-01-16

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