EP1797627A1 - Device for monitoring a motor vehicle alternator based on the life situation of said vehicle, and associated method - Google Patents

Device for monitoring a motor vehicle alternator based on the life situation of said vehicle, and associated method

Info

Publication number
EP1797627A1
EP1797627A1 EP05800243A EP05800243A EP1797627A1 EP 1797627 A1 EP1797627 A1 EP 1797627A1 EP 05800243 A EP05800243 A EP 05800243A EP 05800243 A EP05800243 A EP 05800243A EP 1797627 A1 EP1797627 A1 EP 1797627A1
Authority
EP
European Patent Office
Prior art keywords
vehicle
voltage
situation
alternator
vreg
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.)
Withdrawn
Application number
EP05800243A
Other languages
German (de)
French (fr)
Inventor
Delphine Billat
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 EP1797627A1 publication Critical patent/EP1797627A1/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
    • H02J7/1446—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle in response to parameters of a vehicle
    • 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
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

Definitions

  • the invention generally relates to alternators of motor vehicles, and the control devices of these alternators.
  • the generators controlled according to the prior art are continuously rotating at a speed that is a function of the engine speed, and supply the vehicle's electrical consumers via the battery.
  • the control voltage at the terminals of the alternator is substantially constant (see the curve in broken lines in FIG. 3), this voltage varying slightly as a function of the active electrical consumers.
  • the alternator constantly draws a torque on the engine, this torque corresponding to a portion of the fuel consumption of the vehicle. With the rapid increase in the number of electrical consumers onboard the vehicle, the alternator is increasingly solicited. The torque taken on the engine increases, which is very detrimental to fuel consumption.
  • the present invention aims to overcome the defects mentioned above.
  • a control device of a motor vehicle alternator capable of determining the regulation voltage of said alternator as a function of the life situation of the vehicle, this device comprising means for acquiring a plurality of variables representative of the current vehicle situation, evaluation means for determining as a function of the acquired variables if the vehicle is in one of a plurality of predetermined life situations, and regulating means for determining the voltage regulating the alternator according to the predetermined life situation in which the vehicle is located.
  • the steering device may also have one or more of the features below.
  • the predetermined life situations may include at least the acceleration situation of the vehicle, the deceleration situation of the vehicle, and the stabilized speed situation of the vehicle.
  • the regulating means may comprise a regulation manager determining a setpoint voltage in a relatively lower predetermined first range when the vehicle is in a state of acceleration, in a second, relatively higher predetermined range when the vehicle is in a deceleration position; , and in a third predetermined range intermediate between the high and low forks when the vehicle is in steady state speed, the regulation voltage being a function of the target voltage.
  • the device may comprise means for acquiring the current temperature of the vehicle battery, and protection means for evaluating a maximum acceptable regulation voltage of the alternator as a function of the acquired temperature, the regulation voltage being a function of the minimum between the setpoint voltage and the maximum voltage.
  • the control device may further comprise means for acquiring the current voltage across the battery of the vehicle, and balance means for evaluating the current charge of the battery as a function of the battery voltage acquired, the temperature of the battery battery acquired, and control voltages previously applied to the alternator, the control manager determining the target voltage in a fourth predetermined range when the charge of the battery is below a predetermined threshold.
  • the control manager can determine the setpoint voltage in the fourth predetermined range also when the battery voltage is below a predetermined threshold.
  • the device may comprise means for detecting whether a consumer sensitive to variations in the voltage of the battery is active, the regulating means then directly determining a sensible consumer voltage in a fifth predetermined range, without putting into play the regulator, the control voltage being determined according to said sensitive consumer voltage.
  • the regulating means may comprise filtering means receiving as input, on the one hand, the minimum voltage between the setpoint voltage and the maximum voltage and, on the other hand, the sensitive consumer voltage, and determining the regulation voltage as a function of the inputs of in order to maintain the variations in time of said regulation voltage lower than a predetermined slope.
  • the predetermined life situations can also include the operating situation of the engine, the control manager determining the setpoint voltage in a sixth predetermined range when the vehicle is in operation of the engine.
  • the variables representative of the current situation of the vehicle may be chosen from the variables available in a computer of the motor vehicle, and may include, for example, the position of the accelerator pedal, the speed of the vehicle, the acceleration of the vehicle, the state of the injection, the state of the idle control, the condition of the thermal engine-gearbox coupling, and the condition of the engine.
  • the invention relates to a method for controlling a motor vehicle alternator comprising determining the regulation voltage of said alternator as a function of the vehicle life situation, this method comprising the following steps: 1 / acquisition of a plurality of variables representative of the current situation of the vehicle, 2 / evaluation, as a function of the variables acquired, if the vehicle is in one of a plurality of predetermined life situations,
  • FIG. 1 is a diagrammatic representation of the various sub-components of FIG. functional assemblies of the device according to the invention
  • FIG. 2 is a detailed representation of certain subsets of FIG. 1
  • FIG. 3 is a graphical representation of the regulation voltage applied to the alternator.
  • FIG. 4 is a graphical representation of the speed of the vehicle (graph of up, in km / h) and the regulation voltage applied to the alternator according to the invention (bottom graph, in volts) as a function of time (in abscissa, in seconds)
  • FIG. 5 is a graphical representation. the regulation voltage applied to the alternator according to the invention (top graph, in volts) and the torque taken from the heat engine (bottom graph, in Nm) as a function of time (abscissa, in seconds), for only part of the time interval considered in Figures 3 and 4.
  • the device shown diagrammatically in FIGS. 1 and 2 serves to drive an alternator of a motor vehicle, not shown, by determining the regulating voltage Vreg of said alternator and imposing this voltage at its terminals.
  • the regulation voltage Vreg is set according to the life situation of the vehicle, so as to modulate the torque taken from the engine according to the circumstances.
  • FIG. 1 shows that the control device comprises means 10 for acquiring a plurality of variables representing the current situation of the vehicle, evaluation means 20 for determining, as a function of the variables acquired, whether the vehicle is located in one of a plurality of predetermined life situations, and regulating means 30 for determining the regulator voltage Vreg of the alternator as a function of the predetermined life situation in which the vehicle is located.
  • the variables representative of the current situation of the vehicle are chosen from the variables available in a calculator of the motor vehicle, typically in the engine control computer.
  • variables preferably comprise the position of the accelerator pedal P%, the speed of the vehicle Vit, the acceleration of the vehicle Ace, the state of the injection I, the state of the idle regulation R, the state of the thermal engine-gearbox coupling E, and the state of the engine M / A.
  • the position of the accelerator pedal reflects the will of the driver and is expressed in percentages of the maximum stroke of the pedal, 0% representing a zero depression and 100% a full depression.
  • the state of the injection I is a variable that can adopt two states: inactive injection (no fuel injected into the cylinders of the engine), or active injection.
  • the state of the idle control R is a variable that can adopt two states: active regulation (thermal engine running at idle), or inactive regulation.
  • the state of the thermal engine-gearbox coupling E is a variable that can adopt two states: coupled engine and gearbox (engine torque is transmitted to the gearbox and to the wheels, clutch when engaged) or uncoupled ( torque not transmitted, clutch in disengaged state).
  • the state of the heat engine M / A is a variable that can adopt two states: engine in operation or engine stopped (no combustion).
  • the predetermined life situations include at least the acceleration situation of the vehicle, the deceleration situation of the vehicle, and the stabilized speed situation of the vehicle. They generally also include the engine operating situation.
  • the acceleration situation corresponds to a phase during which the speed of the vehicle increases.
  • the deceleration situation corresponds to a phase during which the speed of the vehicle decreases.
  • the steady speed situation corresponds to a phase during which the vehicle speed does not vary or varies within a narrow range.
  • the operating situation of the engine corresponds to the transition from the engine stopped state to the engine in operation state, that is to say at engine start.
  • Each of these situations is detected using one or more of the variables acquired by the means 10.
  • the acceleration situation is detected using for example the position of the accelerator pedal P%, the speed of the vehicle Vit, and the acceleration of the vehicle Ace.
  • the deceleration situation is detected using, for example, the state of the injection I (inactive injection), the speed of the vehicle Vit, and the acceleration of the vehicle Ace.
  • the stabilized speed situation is detected when the vehicle is neither in a deceleration position nor in an acceleration situation, and using, for example, the state of the idle regulation (active regulation), the speed of the vehicle Vit, and the acceleration of the vehicle Ace.
  • the operating situation is detected using, for example, the state of the thermal engine-gearbox coupling E, and the state of the engine M / A.
  • control device comprises means for acquiring the current temperature of the vehicle battery Tbatt, and protection means 40 for evaluating a regulation voltage of the maximum acceptable alternator Vmax in function of the acquired Tbatt temperature.
  • This maximum voltage Vmax is determined using tables, maps or equations predetermined, known per se.
  • the control device comprises means for acquiring the current voltage across the battery of the vehicle Vbatt, and balance means 50 for evaluating the current charge of the battery Cbatt as a function of the battery voltage Vbatt acquired, the temperature acquired Tbatt battery, and Vreg regulation voltages previously applied to the alternator.
  • This charge Cbatt is determined by taking stock of the periods of charge and discharge of the battery, using equations known per se.
  • the regulation means 30 comprise activating means 31 activating, as a function of the life situation determined by the evaluation means 20, a state among the ballast states, shedding, stabilized speed and starting, a control manager 32 determining a set voltage Vcons at least as a function of the state activated by the activation means 31, and filtering means 33 determining the regulation voltage Vreg at least as a function of the setpoint voltage Vcons.
  • the device comprises means for detecting whether a consumer sensitive to variations in the voltage of the battery CS is active, that is to say supplied with electric current from the battery or the alternator. This information is transmitted to the activation means 31.
  • the sensitive consumers are typically the projectors of the vehicle and the ventilation and air conditioning devices of the vehicle. These consumers must only be subject to very gradual variations in voltage so that passengers can not perceive a change in the luminous intensity of the headlamps or the ventilation air flow.
  • the ballast state is activated by the activation means 31 in the deceleration situation, when no sensible consumer is active. This state is favorable to take more torque on the engine.
  • the shedding state is activated by the activation means 31 in the acceleration situation, when no sensitive consumer is active. In order to give more brilliance to the vehicle and to allow more frank acceleration, it is better to take less torque on the engine in this state.
  • the stabilized speed state is activated in the stabilized speed situation, when no sensitive consumer is active.
  • the start state is activated in the commissioning situation.
  • the regulation manager 32 is informed by the activation means 31 of the activated state and also receives the balance sheet means 50 the current values of the charge of the battery Cbatt and the battery voltage.
  • the control manager 32 selects the setpoint voltage Vcons in a relatively lower first predetermined range when the load shedding state is activated, in a second, relatively higher predetermined range when the ballast condition is activated, in a third predetermined range. intermediate between the high and low forks when the stabilized speed state is activated.
  • the regulation manager 32 determines the setpoint voltage Vcons in a sixth predetermined low range, generally close to 12 volts, when the start state is activated, that is to say when the alternator is operating as a starter, so that do not over-discharge the battery.
  • the set voltage Vcons is chosen in a fourth predetermined range when the charge of the battery Cbatt is below a predetermined threshold or when the battery voltage Tbatt is below a predetermined threshold, and this whatever the activated state.
  • the fourth range is relatively high. Note that it is possible to provide that the regulating means 32 choose the set voltage Vcons in different ranges when the charge of the battery is low, and when the temperature of the battery is low.
  • the regulation means 30 then compare the setpoint voltage Vcons with the maximum voltage Vmax determined by the protection means 40, the minimum between the setpoint voltage Vcons and the maximum voltage Vmax being transmitted to the control means. filtering 33.
  • the filtering means 33 receive at input either the minimum voltage between the setpoint voltage Vcons and the maximum voltage Vmax, or the maximum voltage Vmax, and determine the regulation voltage as a function of the input voltage so as to maintain the variations in the time of said regulation voltage Vreg lower than a predetermined first slope.
  • the regulation means 30 then directly determine a sensible consumer voltage Vcs in a fifth predetermined range, without putting into play the management means 32, this voltage being inputted to the means 33. These then determine the control voltage Vreg as a function of said sensitive consumer voltage Vcs, so as to maintain the variations in time of said regulation voltage Vreg lower than a second predetermined slope.
  • the second slope is, in absolute value, generally lower than the first.
  • This degraded mode quickly restores the charge of the battery after starting the engine, and start the normal driving of the alternator with a fully charged battery.
  • the voltage values in the different ranges are chosen using tables, maps or formulas known per se. All the means described above, with the exception of the means for acquiring variables or data, are calculation means housed in an on-board computer on board the vehicle.
  • FIGS 3 to 5 illustrate the results obtained with the aid of the device described above.
  • control voltage of an alternator driven according to the prior art is substantially constant and equal to approximately 13.8 volts.
  • the regulator voltage of an alternator driven by the device described above on the contrary varies as a function of time, depending on the life situations of the vehicle.
  • FIG. 4 shows in parallel the evolution of the vehicle speed and the evolution of the regulation voltage Vreg.
  • FIG. 5 shows that the variations of the regulation voltage Vreg at the terminals of the alternator have an important effect on the torque taken by the alternator on the heat engine. It can be seen that the torque taken increases with the voltage and goes from 1 to 3 Nm when the voltage goes from 13.2 volts to 14.5 volts.
  • control device described above has many advantages.
  • the driving pleasure is increased, which is a commercial advantage for the vehicle.
  • a higher regulation voltage is imposed in situations where the vehicle has little or no need for the engine torque, that is to say in the deceleration phases. We can then take a portion of the engine torque to recharge the battery without inconvenience to the operation of the vehicle and without reducing its performance. This particularly fine management of the alternator keeps the battery constantly under load, while reducing the average fuel consumption.
  • the device comprises various functionalities, making it possible to maintain the battery at an acceptable temperature, to maintain its charge at a sufficient level, and to limit the instantaneous variations of the regulation voltage so that the passengers of the vehicle can not perceive these variations.
  • the control voltage varies slowly enough so that, for example, the luminous intensity of the projectors or the ventilation air flow rate seems constant.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention concerns a device for monitoring a motor vehicle alternator capable of determining the regulating voltage (Vreg) of said alternator based on the vehicle life situation, said device comprising means (10) for acquiring a plurality of variables (P %, Vit, Acc, I, R, E, M/A) representing the current situation of the vehicle, assessing means (20) for determining whether the vehicle is in a plurality of predetermined life situations, and regulating means (30) for determining the alternator regulating voltage (Vreg) based on the predetermined life situation in which the vehicle is.

Description

DISPOSITIF DE PILOTAGE D'UN ALTERNATEUR DE VEHICULE AUTOMOBILE EN FONCTION DE LA SITUATION DE VIE DE CE VEHICULE, DEVICE FOR DRIVING A MOTOR VEHICLE ALTERNATOR IN ACCORDANCE WITH THE LIFE SITUATION OF THIS VEHICLE,
ET METHODE ASSOCIEEAND ASSOCIATED METHOD
L' invention concerne en général les alternateurs de véhicules automobiles, et les dispositifs de pilotage de ces alternateurs.The invention generally relates to alternators of motor vehicles, and the control devices of these alternators.
Les alternateurs pilotés selon l'art antérieur tournent en permanence à une vitesse fonction du régime moteur, et alimentent les consommateurs électriques du véhicule via la batterie. La tension de régulation aux bornes de l'alternateur est sensiblement constante (voir la courbe en traits interrompus sur la figure 3), cette tension variant légèrement en fonction des consommateurs électriques actifs. Pour fournir de l'énergie électrique, l'alternateur prélève en permanence un couple sur le moteur thermique, ce couple correspondant à une partie de la consommation de carburant du véhicule. Avec l'augmentation rapide du nombre de consommateurs électriques embarqués à bord du véhicule, l'alternateur est de plus en plus sollicité. Le couple prélevé sur le moteur thermique augmente, ce qui est très pénalisant pour la consommation de carburant. Dans ce contexte, la présente invention a pour but de pallier les défauts mentionnés ci-dessus.The generators controlled according to the prior art are continuously rotating at a speed that is a function of the engine speed, and supply the vehicle's electrical consumers via the battery. The control voltage at the terminals of the alternator is substantially constant (see the curve in broken lines in FIG. 3), this voltage varying slightly as a function of the active electrical consumers. To provide electrical energy, the alternator constantly draws a torque on the engine, this torque corresponding to a portion of the fuel consumption of the vehicle. With the rapid increase in the number of electrical consumers onboard the vehicle, the alternator is increasingly solicited. The torque taken on the engine increases, which is very detrimental to fuel consumption. In this context, the present invention aims to overcome the defects mentioned above.
Cet objectif est atteint à l'aide d'un dispositif de pilotage d'un alternateur de véhicule automobile apte à déterminer la tension de régulation dudit alternateur en fonction de la situation de vie du véhicule, ce dispositif comprenant des moyens d'acquisition d'une pluralité de variables représentatives de la situation courante du véhicule, des moyens d'évaluation pour déterminer en fonction des variables acquises si le véhicule se trouve dans une d'une pluralité de situations de vie prédéterminées, et des moyens de régulation pour déterminer la tension de régulation de l'alternateur en fonction de la situation de vie prédéterminée dans laquelle se trouve le véhicule .This objective is achieved by means of a control device of a motor vehicle alternator capable of determining the regulation voltage of said alternator as a function of the life situation of the vehicle, this device comprising means for acquiring a plurality of variables representative of the current vehicle situation, evaluation means for determining as a function of the acquired variables if the vehicle is in one of a plurality of predetermined life situations, and regulating means for determining the voltage regulating the alternator according to the predetermined life situation in which the vehicle is located.
Le dispositif de pilotage peut également présenter une ou plusieurs des caractéristiques ci-dessous. Les situations de vie prédéterminées peuvent comprendre au moins la situation d'accélération du véhicule, la situation de décélération du véhicule, et la situation de vitesse stabilisée du véhicule. - Les moyens de régulation peuvent comprendre un gestionnaire de régulation déterminant une tension de consigne dans une première fourchette prédéterminée relativement plus basse quand le véhicule est en situation d'accélération, dans une seconde fourchette prédéterminée relativement plus haute quand le véhicule est en situation de décélération, et dans une troisième fourchette prédéterminée intermédiaire entre les fourchettes haute et basse quand le véhicule est en situation de vitesse stabilisée, la tension de régulation étant fonction de la tension de consigne.The steering device may also have one or more of the features below. The predetermined life situations may include at least the acceleration situation of the vehicle, the deceleration situation of the vehicle, and the stabilized speed situation of the vehicle. The regulating means may comprise a regulation manager determining a setpoint voltage in a relatively lower predetermined first range when the vehicle is in a state of acceleration, in a second, relatively higher predetermined range when the vehicle is in a deceleration position; , and in a third predetermined range intermediate between the high and low forks when the vehicle is in steady state speed, the regulation voltage being a function of the target voltage.
Le dispositif peut comprendre des moyens d'acquisition de la température courante de la batterie du véhicule, et des moyens de protection pour évaluer une tension de régulation de l'alternateur maximale acceptable en fonction de la température acquise, la tension de régulation étant fonction du minimum entre la tension de consigne et la tension maximale.The device may comprise means for acquiring the current temperature of the vehicle battery, and protection means for evaluating a maximum acceptable regulation voltage of the alternator as a function of the acquired temperature, the regulation voltage being a function of the minimum between the setpoint voltage and the maximum voltage.
Le dispositif de pilotage peut encore comprendre des moyens d'acquisition de la tension courante aux bornes de la batterie du véhicule, et des moyens de bilan pour évaluer la charge courante de la batterie en fonction de la tension batterie acquise, de la température de la batterie acquise, et des tensions de régulation précédemment appliquées à l'alternateur, le gestionnaire de régulation déterminant la tension de consigne dans une quatrième fourchette prédéterminée quand la charge de la batterie est inférieure à un seuil prédéterminé .The control device may further comprise means for acquiring the current voltage across the battery of the vehicle, and balance means for evaluating the current charge of the battery as a function of the battery voltage acquired, the temperature of the battery battery acquired, and control voltages previously applied to the alternator, the control manager determining the target voltage in a fourth predetermined range when the charge of the battery is below a predetermined threshold.
Le gestionnaire de régulation peut déterminer la tension de consigne dans la quatrième fourchette prédéterminée également quand la tension de la batterie est inférieure à un seuil prédéterminé. Le dispositif peut comprendre des moyens pour détecter si un consommateur sensible aux variations de la tension de la batterie est actif, les moyens de régulation déterminant alors directement une tension consommateur sensible dans une cinquième fourchette prédéterminée, sans mettre en jeu le gestionnaire de régulation, la tension de régulation étant déterminée en fonction de ladite tension consommateur sensible .The control manager can determine the setpoint voltage in the fourth predetermined range also when the battery voltage is below a predetermined threshold. The device may comprise means for detecting whether a consumer sensitive to variations in the voltage of the battery is active, the regulating means then directly determining a sensible consumer voltage in a fifth predetermined range, without putting into play the regulator, the control voltage being determined according to said sensitive consumer voltage.
Les moyens de régulation peuvent comprendre des moyens de filtrage recevant en entrée d'une part la tension minimum entre la tension de consigne et la tension maximale et d'autre part la tension consommateur sensible, et déterminant la tension de régulation en fonction des entrées de façon à maintenir les variations dans le temps de ladite tension de régulation inférieures à une pente prédéterminée.The regulating means may comprise filtering means receiving as input, on the one hand, the minimum voltage between the setpoint voltage and the maximum voltage and, on the other hand, the sensitive consumer voltage, and determining the regulation voltage as a function of the inputs of in order to maintain the variations in time of said regulation voltage lower than a predetermined slope.
Les situations de vie prédéterminées peuvent comprendre aussi la situation de mise en fonctionnement du moteur, le gestionnaire de régulation déterminant la tension de consigne dans une sixième fourchette prédéterminée quand le véhicule est en situation de mise en fonctionnement du moteur.The predetermined life situations can also include the operating situation of the engine, the control manager determining the setpoint voltage in a sixth predetermined range when the vehicle is in operation of the engine.
Les variables représentatives de la situation courante du véhicule peuvent être choisies parmi les variables disponibles dans un calculateur du véhicule automobile, et peuvent comprendre par exemple la position de la pédale d'accélérateur, la vitesse du véhicule, l'accélération du véhicule, l'état de l'injection, l'état de la régulation de ralenti, l'état de l'accouplement moteur thermique-boîte de vitesses, et l'état du moteur thermique.The variables representative of the current situation of the vehicle may be chosen from the variables available in a computer of the motor vehicle, and may include, for example, the position of the accelerator pedal, the speed of the vehicle, the acceleration of the vehicle, the state of the injection, the state of the idle control, the condition of the thermal engine-gearbox coupling, and the condition of the engine.
Selon un second aspect, l'invention porte sur une méthode de pilotage d'un alternateur de véhicule automobile consistant à déterminer la tension de régulation dudit alternateur en fonction de la situation de vie du véhicule, cette méthode comprenant les étapes suivantes : 1/ acquisition d'une pluralité de variables représentatives de la situation courante du véhicule, 2/ évaluation, en fonction des variables acquises, si le véhicule se trouve dans une d'une pluralité de situations de vie prédéterminées,According to a second aspect, the invention relates to a method for controlling a motor vehicle alternator comprising determining the regulation voltage of said alternator as a function of the vehicle life situation, this method comprising the following steps: 1 / acquisition of a plurality of variables representative of the current situation of the vehicle, 2 / evaluation, as a function of the variables acquired, if the vehicle is in one of a plurality of predetermined life situations,
3/ détermination de la tension de régulation de l'alternateur en fonction de la situation de vie prédéterminée dans laquelle se trouve le véhicule.3 / determining the regulator voltage of the alternator as a function of the predetermined life situation in which the vehicle is located.
D'autres caractéristiques et avantages de l'invention ressortiront clairement de la description qui en est faite ci-dessous, à titre indicatif et nullement limitatif, en référence aux figures annexées, parmi lesquelles : la figure 1 est une représentation schématique des différents sous-ensembles fonctionnels du dispositif selon l'invention, la figure 2 est une représentation détaillée de certains sous-ensembles de la figure 1, la figure 3 est une représentation graphique de la tension de régulation appliquée à l'alternateurOther characteristics and advantages of the invention will emerge clearly from the description which is given below, by way of indication and in no way limiting, with reference to the appended figures, in which: FIG. 1 is a diagrammatic representation of the various sub-components of FIG. functional assemblies of the device according to the invention, FIG. 2 is a detailed representation of certain subsets of FIG. 1, FIG. 3 is a graphical representation of the regulation voltage applied to the alternator.
(ordonnée en volts) en fonction du temps (abscisse, en secondes) , dans l'art antérieur (traits interrompus) et selon l'invention (traits pleins) , la figure 4 est une représentation graphique de la vitesse du véhicule (graphe du haut, en km/h) et de la tension de régulation appliquée à l'alternateur selon l'invention (graphe du bas, en volts) en fonction du temps (en abscisse, en secondes) , et la figure 5 est une représentation graphique de la tension de régulation appliquée à l'alternateur selon l'invention (graphe du haut, en volts) et du couple prélevé sur le moteur thermique (graphe du bas, en N.m) en fonction du temps (abscisse, en secondes) , pour une partie seulement de l'intervalle de temps considéré dans les figures 3 et 4.(ordinate in volts) as a function of time (abscissa, in seconds), in the prior art (dashed lines) and according to the invention (solid lines), FIG. 4 is a graphical representation of the speed of the vehicle (graph of up, in km / h) and the regulation voltage applied to the alternator according to the invention (bottom graph, in volts) as a function of time (in abscissa, in seconds), and FIG. 5 is a graphical representation. the regulation voltage applied to the alternator according to the invention (top graph, in volts) and the torque taken from the heat engine (bottom graph, in Nm) as a function of time (abscissa, in seconds), for only part of the time interval considered in Figures 3 and 4.
Le dispositif représenté schématiquement sur les figures 1 et 2 a pour fonction de piloter un alternateur de véhicule automobile, non représenté, en déterminant la tension de régulation Vreg dudit alternateur et en imposant cette tension à ses bornes.The device shown diagrammatically in FIGS. 1 and 2 serves to drive an alternator of a motor vehicle, not shown, by determining the regulating voltage Vreg of said alternator and imposing this voltage at its terminals.
La tension de régulation Vreg est fixée en fonction de la situation de vie du véhicule, de façon à moduler le couple prélevé sur le moteur en fonction des circonstances .The regulation voltage Vreg is set according to the life situation of the vehicle, so as to modulate the torque taken from the engine according to the circumstances.
Plus la tension de régulation Vreg est élevée, plus l'alternateur prélève de couple sur le moteur et plus la consommation de carburant est élevée. Lorsque cette tension est égale à la tension à vide de la batterie, l'alternateur ne prélève quasiment plus de couple sur le moteur, ce qui réduit la consommation de carburant.The higher the regulating voltage Vreg, the more torque the motor picks up and the higher the fuel consumption. When this voltage is equal to the no-load voltage of the battery, the alternator removes almost no torque on the engine, which reduces fuel consumption.
On voit sur la figure 1 que le dispositif de pilotage comprend des moyens 10 d'acquisition d'une pluralité de variables représentatives de la situation courante du véhicule, des moyens d'évaluation 20 pour déterminer en fonction des variables acquises si le véhicule se trouve dans une d'une pluralité de situations de vie prédéterminées, et des moyens de régulation 30 pour déterminer la tension de régulation Vreg de l'alternateur en fonction de la situation de vie prédéterminée dans laquelle se trouve le véhicule .FIG. 1 shows that the control device comprises means 10 for acquiring a plurality of variables representing the current situation of the vehicle, evaluation means 20 for determining, as a function of the variables acquired, whether the vehicle is located in one of a plurality of predetermined life situations, and regulating means 30 for determining the regulator voltage Vreg of the alternator as a function of the predetermined life situation in which the vehicle is located.
Les variables représentatives de la situation courante du véhicule sont choisies parmi les variables disponibles dans un calculateur du véhicule automobile, typiquement dans le calculateur de contrôle moteur.The variables representative of the current situation of the vehicle are chosen from the variables available in a calculator of the motor vehicle, typically in the engine control computer.
Ces variables comprennent de préférence la position de la pédale d'accélérateur P%, la vitesse du véhicule Vit, l'accélération du véhicule Ace, l'état de l'injection I, l'état de la régulation de ralenti R, l'état de l'accouplement moteur thermique-boîte de vitesses E, et l'état du moteur thermique M/A.These variables preferably comprise the position of the accelerator pedal P%, the speed of the vehicle Vit, the acceleration of the vehicle Ace, the state of the injection I, the state of the idle regulation R, the state of the thermal engine-gearbox coupling E, and the state of the engine M / A.
La position de la pédale d'accélérateur traduit la volonté du conducteur et est exprimée en pourcentages de la course maximale de la pédale, 0% représentant un enfoncement nul et 100% un enfoncement complet. L'état de l'injection I est une variable pouvant adopter deux états : injection inactive (pas d'essence injectée dans les cylindres du moteur thermique) , ou injection active. L'état de la régulation de ralenti R est une variable pouvant adopter deux états : régulation active (moteur thermique tournant au ralenti) , ou régulation inactive.The position of the accelerator pedal reflects the will of the driver and is expressed in percentages of the maximum stroke of the pedal, 0% representing a zero depression and 100% a full depression. The state of the injection I is a variable that can adopt two states: inactive injection (no fuel injected into the cylinders of the engine), or active injection. The state of the idle control R is a variable that can adopt two states: active regulation (thermal engine running at idle), or inactive regulation.
L'état de l'accouplement moteur thermique-boîte de vitesses E est une variable pouvant adopter deux états : moteur et boîte accouplés (le couple du moteur est transmis à la boîte et aux roues, embrayage à l'état embrayé) ou désaccouplés (couple non transmis, embrayage à l'état débrayé) . L'état du moteur thermique M/A est une variable pouvant adopter deux états : moteur en fonctionnement ou moteur arrêté (pas de combustion) .The state of the thermal engine-gearbox coupling E is a variable that can adopt two states: coupled engine and gearbox (engine torque is transmitted to the gearbox and to the wheels, clutch when engaged) or uncoupled ( torque not transmitted, clutch in disengaged state). The state of the heat engine M / A is a variable that can adopt two states: engine in operation or engine stopped (no combustion).
Les situations de vie prédéterminées comprennent au moins la situation d'accélération du véhicule, la situation de décélération du véhicule, et la situation de vitesse stabilisée du véhicule. Ils comprennent généralement également la situation de mise en fonctionnement du moteur.The predetermined life situations include at least the acceleration situation of the vehicle, the deceleration situation of the vehicle, and the stabilized speed situation of the vehicle. They generally also include the engine operating situation.
La situation d'accélération correspond à une phase pendant laquelle la vitesse du véhicule augmente.The acceleration situation corresponds to a phase during which the speed of the vehicle increases.
La situation de décélération correspond à une phase pendant laquelle la vitesse du véhicule diminue.The deceleration situation corresponds to a phase during which the speed of the vehicle decreases.
La situation de vitesse stabilisée correspond à une phase pendant laquelle la vitesse du véhicule ne varie pas ou varie dans une fourchette étroite.The steady speed situation corresponds to a phase during which the vehicle speed does not vary or varies within a narrow range.
La situation de mise en fonctionnement du moteur correspond au passage de l'état moteur arrêté à l'état moteur en fonctionnement, c'est-à-dire au démarrage du moteur. Chacune de ces situations est détectée en utilisant une ou plusieurs des variables acquises par les moyens 10. La situation d'accélération est détectée en utilisant par exemple la position de la pédale d'accélérateur P%, la vitesse du véhicule Vit, et l'accélération du véhicule Ace. La situation de décélération est détectée en utilisant par exemple l'état de l'injection I (injection inactive) , la vitesse du véhicule Vit, et l'accélération du véhicule Ace.The operating situation of the engine corresponds to the transition from the engine stopped state to the engine in operation state, that is to say at engine start. Each of these situations is detected using one or more of the variables acquired by the means 10. The acceleration situation is detected using for example the position of the accelerator pedal P%, the speed of the vehicle Vit, and the acceleration of the vehicle Ace. The deceleration situation is detected using, for example, the state of the injection I (inactive injection), the speed of the vehicle Vit, and the acceleration of the vehicle Ace.
La situation de vitesse stabilisée est détectée quand le véhicule n'est ni en situation de décélération ni en situation d'accélération, et en utilisant par exemple l'état de la régulation de ralenti (régulation active) , la vitesse du véhicule Vit, et l'accélération du véhicule Ace. La situation de mise en fonctionnement est détectée en utilisant par exemple l'état de l'accouplement moteur thermique-boîte de vitesses E, et l'état du moteur thermique M/A.The stabilized speed situation is detected when the vehicle is neither in a deceleration position nor in an acceleration situation, and using, for example, the state of the idle regulation (active regulation), the speed of the vehicle Vit, and the acceleration of the vehicle Ace. The operating situation is detected using, for example, the state of the thermal engine-gearbox coupling E, and the state of the engine M / A.
On voit encore sur la figure 1 que le dispositif de pilotage comprend des moyens d'acquisition de la température courante de la batterie du véhicule Tbatt, et des moyens de protection 40 pour évaluer une tension de régulation de l'alternateur maximale acceptable Vmax en fonction de la température Tbatt acquise. Cette tension maximale Vmax est déterminées à l'aide de tables, de cartographies ou d'équations prédéterminées, connues en soi.It can still be seen in FIG. 1 that the control device comprises means for acquiring the current temperature of the vehicle battery Tbatt, and protection means 40 for evaluating a regulation voltage of the maximum acceptable alternator Vmax in function of the acquired Tbatt temperature. This maximum voltage Vmax is determined using tables, maps or equations predetermined, known per se.
Le dispositif de pilotage comprend des moyens d'acquisition de la tension courante aux bornes de la batterie du véhicule Vbatt, et des moyens de bilan 50 pour évaluer la charge courante de la batterie Cbatt en fonction de la tension batterie Vbatt acquise, de la température de la batterie Tbatt acquise, et des tensions de régulation Vreg précédemment appliquées à l'alternateur. Cette charge Cbatt est déterminée en faisant le bilan des périodes de charge et de décharge de la batterie, à l'aide d'équations connues en soi.The control device comprises means for acquiring the current voltage across the battery of the vehicle Vbatt, and balance means 50 for evaluating the current charge of the battery Cbatt as a function of the battery voltage Vbatt acquired, the temperature acquired Tbatt battery, and Vreg regulation voltages previously applied to the alternator. This charge Cbatt is determined by taking stock of the periods of charge and discharge of the battery, using equations known per se.
Les moyens de régulation 30 comprennent des moyens d'activation 31 activant, en fonction de la situation de vie déterminée par les moyens d'évaluation 20, un état parmi les états de lestage, délestage, vitesse stabilisé et démarrage, un gestionnaire de régulation 32 déterminant une tension de consigne Vcons au moins en fonction de l'état activé par les moyens d'activation 31, et des moyens de filtrage 33 déterminant la tension de régulation Vreg au moins en fonction de la tension de consigne Vcons.The regulation means 30 comprise activating means 31 activating, as a function of the life situation determined by the evaluation means 20, a state among the ballast states, shedding, stabilized speed and starting, a control manager 32 determining a set voltage Vcons at least as a function of the state activated by the activation means 31, and filtering means 33 determining the regulation voltage Vreg at least as a function of the setpoint voltage Vcons.
On précisera de plus que le dispositif comprend des moyens pour détecter si un consommateur sensible aux variations de la tension de la batterie CS est actif, c'est-à-dire alimenté en courant électrique à partir de la batterie ou de l'alternateur. Cette information est transmise aux moyens d'activation 31. Les consommateurs sensibles sont typiquement les projecteurs du véhicule et les dispositifs de ventilation et de climatisation du véhicule. Ces consommateurs ne doivent être soumis qu'à des variations de tensions très progressives, pour que les passagers ne puisse pas percevoir de modification de l'intensité lumineuse des projecteurs ou du débit d'air de ventilation.It will be further specified that the device comprises means for detecting whether a consumer sensitive to variations in the voltage of the battery CS is active, that is to say supplied with electric current from the battery or the alternator. This information is transmitted to the activation means 31. The sensitive consumers are typically the projectors of the vehicle and the ventilation and air conditioning devices of the vehicle. These consumers must only be subject to very gradual variations in voltage so that passengers can not perceive a change in the luminous intensity of the headlamps or the ventilation air flow.
L'état de lestage est activé par les moyens d'activation 31 dans la situation de décélération, quand aucun consommateur sensible n'est actif. Cet état est favorable pour prélever plus de couple sur le moteur thermique.The ballast state is activated by the activation means 31 in the deceleration situation, when no sensible consumer is active. This state is favorable to take more torque on the engine.
L'état de délestage est activé par les moyens d'activation 31 dans la situation d'accélération, quand aucun consommateur sensible n'est actif. De façon à donner plus de brio au véhicule et à permettre des accélérations plus franches, il est préférable de prélever moins de couple sur le moteur thermique dans cet état.The shedding state is activated by the activation means 31 in the acceleration situation, when no sensitive consumer is active. In order to give more brilliance to the vehicle and to allow more frank acceleration, it is better to take less torque on the engine in this state.
L'état de vitesse stabilisée est activé dans la situation de vitesse stabilisée, quand aucun consommateur sensible n'est actif.The stabilized speed state is activated in the stabilized speed situation, when no sensitive consumer is active.
L'état de démarrage est activé dans la situation de mise en fonctionnement.The start state is activated in the commissioning situation.
Le gestionnaire de régulation 32 est informé par les moyens d'activation 31 de l'état activé et reçoit par ailleurs des moyens de bilan 50 les valeurs courantes de la charge de la batterie Cbatt et de la tension batterieThe regulation manager 32 is informed by the activation means 31 of the activated state and also receives the balance sheet means 50 the current values of the charge of the battery Cbatt and the battery voltage.
Tbatt (voir figure 2) .Tbatt (see Figure 2).
Le gestionnaire de régulation 32 choisit la tension de consigne Vcons dans une première fourchette prédéterminée relativement plus basse quand l'état de délestage est activé, dans une seconde fourchette prédéterminée relativement plus haute quand l'état de lestage est activé, dans une troisième fourchette prédéterminée intermédiaire entre les fourchettes haute et basse quand l'état de vitesse stabilisée est activé.The control manager 32 selects the setpoint voltage Vcons in a relatively lower first predetermined range when the load shedding state is activated, in a second, relatively higher predetermined range when the ballast condition is activated, in a third predetermined range. intermediate between the high and low forks when the stabilized speed state is activated.
Le gestionnaire de régulation 32 détermine la tension de consigne Vcons dans une sixième fourchette prédéterminée basse, généralement proche de 12 Volts, quand l'état de démarrage est activé, c'est-à-dire quand l'alternateur fonctionne en démarreur, de façon à ne pas trop décharger la batterie.The regulation manager 32 determines the setpoint voltage Vcons in a sixth predetermined low range, generally close to 12 volts, when the start state is activated, that is to say when the alternator is operating as a starter, so that do not over-discharge the battery.
La tension de consigne Vcons est choisie dans une quatrième fourchette prédéterminée quand la charge de la batterie Cbatt est inférieure à un seuil prédéterminé ou quand la tension de la batterie Tbatt est inférieure à un seuil prédéterminé, et ceci quel que soit l'état activé.The set voltage Vcons is chosen in a fourth predetermined range when the charge of the battery Cbatt is below a predetermined threshold or when the battery voltage Tbatt is below a predetermined threshold, and this whatever the activated state.
Dans cette situation, la recharge de la batterie est prioritaire par rapport à l'optimisation du fonctionnement de l'alternateur et aux économies de carburants correspondants.In this situation, recharging the battery has priority over optimizing the operation of the alternator and the corresponding fuel savings.
La quatrième fourchette est relativement haute. On notera qu'il est possible de prévoir que les moyens de régulation 32 choisissent la tension de consigne Vcons dans des fourchettes différentes quand la charge de la batterie est faible, et quand la température de la batterie est faible.The fourth range is relatively high. Note that it is possible to provide that the regulating means 32 choose the set voltage Vcons in different ranges when the charge of the battery is low, and when the temperature of the battery is low.
On voit sur la figure 2 que les moyens de régulation 30 comparent ensuite la tension de consigne Vcons à la tension maximale Vmax déterminée par les moyens de protection 40, le minimum entre la tension de consigne Vcons et la tension maximale Vmax étant transmis aux moyens de filtrage 33.It can be seen in FIG. 2 that the regulation means 30 then compare the setpoint voltage Vcons with the maximum voltage Vmax determined by the protection means 40, the minimum between the setpoint voltage Vcons and the maximum voltage Vmax being transmitted to the control means. filtering 33.
En cas de défaut des moyens d'acquisition de la position de la pédale d'accélérateur ou de l'accélération véhicule, c'est la tension maximale Vmax qui est transmise aux moyens de filtrage 33, indépendamment de la valeur de la tension de consigne Vcons.In the event of a fault in the means for acquiring the position of the accelerator pedal or the vehicle acceleration, it is the maximum voltage Vmax that is transmitted to the filtering means 33, independently of the value of the target voltage. Vcons.
Les moyens de filtrage 33 reçoivent en entrée soit la tension minimum entre la tension de consigne Vcons et la tension maximale Vmax, soit la tension maximale Vmax, et déterminent la tension de régulation en fonction la tension d'entrée de façon à maintenir les variations dans le temps de ladite tension de régulation Vreg inférieures à une pente première prédéterminée.The filtering means 33 receive at input either the minimum voltage between the setpoint voltage Vcons and the maximum voltage Vmax, or the maximum voltage Vmax, and determine the regulation voltage as a function of the input voltage so as to maintain the variations in the time of said regulation voltage Vreg lower than a predetermined first slope.
Par ailleurs, au cas où un consommateur sensible CS est actif, les moyens de régulation 30 déterminent alors directement une tension consommateur sensible Vcs dans une cinquième fourchette prédéterminée, sans mettre en jeu les moyens de gestion 32, cette tension étant envoyée en entrée aux moyens de filtrage 33. Ceux-ci déterminent alors la tension de régulation Vreg en fonction de ladite tension consommateur sensible Vcs, de façon à maintenir les variations dans le temps de ladite tension de régulation Vreg inférieures à une seconde pente prédéterminée. La seconde pente est, en valeur absolue, généralement inférieure à la première. On notera qu' il est prévu dans le dispositif de pilotage un mode de fonctionnement dégradé, qui s'applique pendant 200 secondes environ après la mise en fonctionnement du moteur (situation de mise en fonctionnement) . Dans ce mode de fonctionnement dégradé, seuls les états de lestage et de vitesse stabilisée sont autorisés, l'état de délestage étant interdit.Moreover, in the case where a sensitive consumer CS is active, the regulation means 30 then directly determine a sensible consumer voltage Vcs in a fifth predetermined range, without putting into play the management means 32, this voltage being inputted to the means 33. These then determine the control voltage Vreg as a function of said sensitive consumer voltage Vcs, so as to maintain the variations in time of said regulation voltage Vreg lower than a second predetermined slope. The second slope is, in absolute value, generally lower than the first. Note that there is provided in the control device a degraded operating mode, which applies for about 200 seconds after starting the engine (operating situation). In this degraded operating mode, only the ballast and stabilized speed conditions are allowed, the load shedding state being prohibited.
Ce mode dégradé permet de reconstituer rapidement la charge de la batterie après le démarrage du moteur, et de démarrer le pilotage normal de l'alternateur avec une batterie à pleine charge.This degraded mode quickly restores the charge of the battery after starting the engine, and start the normal driving of the alternator with a fully charged battery.
Les valeurs de tension dans les différentes fourchettes sont choisies à l'aide de tables, de cartographies ou de formules connues en soi . Tous les moyens décrits ci-dessus, à l'exception des moyens d'acquisition de variables ou de données, sont des moyens de calcul, logés dans un calculateur embarqué à bord du véhicule.The voltage values in the different ranges are chosen using tables, maps or formulas known per se. All the means described above, with the exception of the means for acquiring variables or data, are calculation means housed in an on-board computer on board the vehicle.
Les figures 3 à 5 illustrent les résultats obtenus à l'aide du dispositif décrit ci-dessus.Figures 3 to 5 illustrate the results obtained with the aid of the device described above.
On voit sur la figure 3 que la tension de régulation d'un alternateur piloté selon l'art antérieur est sensiblement constante et égale à environ 13,8 Volts.It can be seen in FIG. 3 that the control voltage of an alternator driven according to the prior art is substantially constant and equal to approximately 13.8 volts.
La tension de régulation d'un alternateur piloté par le dispositif décrit plus haut au contraire varie en fonction du temps, selon les situations de vie du véhicule.The regulator voltage of an alternator driven by the device described above on the contrary varies as a function of time, depending on the life situations of the vehicle.
La figure 4 montre en parallèle l'évolution de la vitesse du véhicule et l'évolution de la tension de régulation Vreg.FIG. 4 shows in parallel the evolution of the vehicle speed and the evolution of the regulation voltage Vreg.
On voit que le dispositif fonctionne en mode dégradé jusqu'à 200 secondes.We see that the device operates in degraded mode up to 200 seconds.
Après 200 secondes, le dispositif bascule en mode normal et tous les états sont autorisés. A chaque accélération, la tension de régulation Vreg diminue, et à chaque décélération, la tension de régulation Vreg augmente. La figure 5 montre que les variations de la tension de régulation Vreg aux bornes de l'alternateur ont un effet important sur le couple prélevé par l'alternateur sur le moteur thermique. On voit que le couple prélevé augmente avec la tension et passe de 1 à 3 N.m quand la tension passe de 13,2 Volts à 14,5 Volts.After 200 seconds, the device switches to normal mode and all states are allowed. At each acceleration, the regulation voltage Vreg decreases, and at each deceleration, the regulation voltage Vreg increases. FIG. 5 shows that the variations of the regulation voltage Vreg at the terminals of the alternator have an important effect on the torque taken by the alternator on the heat engine. It can be seen that the torque taken increases with the voltage and goes from 1 to 3 Nm when the voltage goes from 13.2 volts to 14.5 volts.
Plus le couple prélevé est important, plus la consommation de carburant est importante.The higher the torque taken, the higher the fuel consumption.
Le dispositif de pilotage décrit ci-dessus présente de multiples avantages.The control device described above has many advantages.
Il permet de réguler le fonctionnement de l'alternateur par la tension imposée à ses bornes, et d'adapter le point de fonctionnement de l'alternateur en fonction de la situation de vie du véhicule. Ainsi, une tension de régulation plus basse est imposée dans les situations où le véhicule a besoin d'un couple moteur important, c'est-à-dire dans les phases d'accélération. On augmente ainsi le brio du véhicule et sa capacité d'accélération, en départ arrêté ou pour un dépassement.It makes it possible to regulate the operation of the alternator by the voltage imposed on its terminals, and to adapt the point of operation of the alternator according to the life situation of the vehicle. Thus, a lower regulation voltage is imposed in situations where the vehicle needs a large engine torque, that is to say in the acceleration phases. This increases the brilliance of the vehicle and its acceleration ability, starting off or for an overtaking.
L'agrément de conduite en est augmenté, ce qui est un avantage commercial pour le véhicule.The driving pleasure is increased, which is a commercial advantage for the vehicle.
Une tension de régulation plus haute est imposée dans les situations où le véhicule n'a pas ou peu besoin du couple moteur, c'est-à-dire dans les phases de décélération. On peut alors prélever une partie du couple moteur pour recharger la batterie sans inconvénient pour le fonctionnement du véhicule et sans diminuer ses performances . Cette gestion particulièrement fine de l'alternateur permet de maintenir la batterie constamment en charge, tout en diminuant la consommation moyenne de carburant .A higher regulation voltage is imposed in situations where the vehicle has little or no need for the engine torque, that is to say in the deceleration phases. We can then take a portion of the engine torque to recharge the battery without inconvenience to the operation of the vehicle and without reducing its performance. This particularly fine management of the alternator keeps the battery constantly under load, while reducing the average fuel consumption.
Ces performances sont réalisées de façon particulièrement économique, puisqu'il n'est pas nécessaire d'ajouter des capteurs sur le véhicule. Les informations nécessaires à la détection des situations de vie du véhicule sont disponibles dans les calculateurs embarqués .These performances are made particularly economically, since it is not necessary to add sensors to the vehicle. The information necessary to detect situations of vehicle life are available in embedded calculators.
Enfin, le dispositif comprend différentes fonctionnalités, permettant de maintenir la batterie à une température acceptable, de maintenir sa charge à un niveau suffisant, et de limiter les variations instantanées de la tension de régulation de façon à ce que les passagers du véhicule ne puissent pas percevoir ces variations. La tension de régulation varie suffisamment lentement pour que, par exemple, l'intensité lumineuse des projecteurs ou le débit d'air de ventilation semble constant. Finally, the device comprises various functionalities, making it possible to maintain the battery at an acceptable temperature, to maintain its charge at a sufficient level, and to limit the instantaneous variations of the regulation voltage so that the passengers of the vehicle can not perceive these variations. The control voltage varies slowly enough so that, for example, the luminous intensity of the projectors or the ventilation air flow rate seems constant.

Claims

REVEND ICATIONS
1. Dispositif de pilotage d'un alternateur de véhicule automobile apte à déterminer la tension de régulation (Vreg) dudit alternateur en fonction de la situation de vie du véhicule, ce dispositif comprenant des moyens (10) d'acquisition d'une pluralité de variables (P%, Vit, Ace, I, R, E, M/A) représentatives de la situation courante du véhicule, des moyens d'évaluation (20) pour déterminer en fonction des variables (P%, Vit, Ace, I, R, E, M/A) acquises si le véhicule se trouve dans une d'une pluralité de situations de vie prédéterminées, et des moyens de régulation (30) pour déterminer la tension de régulation (Vreg) de l'alternateur en fonction de la situation de vie prédéterminée dans laquelle se trouve le véhicule.1. Device for controlling a motor vehicle alternator capable of determining the regulation voltage (Vreg) of said alternator as a function of the life situation of the vehicle, this device comprising means (10) for acquiring a plurality of variables (P%, Vit, Ace, I, R, E, M / A) representative of the current situation of the vehicle, evaluation means (20) for determining as a function of the variables (P%, Vit, Ace, I , R, E, M / A) acquired if the vehicle is in one of a plurality of predetermined life situations, and control means (30) for determining the control voltage (Vreg) of the alternator according to of the predetermined life situation in which the vehicle is located.
2. Dispositif selon la revendication 1, caractérisé en ce que les situations de vie prédéterminées comprennent au moins la situation d'accélération du véhicule, la situation de décélération du véhicule, et la situation de vitesse stabilisée du véhicule.2. Device according to claim 1, characterized in that the predetermined life situations comprise at least the acceleration situation of the vehicle, the deceleration situation of the vehicle, and the stabilized speed situation of the vehicle.
3. Dispositif selon la revendication 2, caractérisé en ce que les moyens de régulation (30) comprennent un gestionnaire de régulation (32) déterminant une tension de consigne (Vcons) dans une première fourchette prédéterminée relativement plus basse quand le véhicule est en situation d'accélération, dans une seconde fourchette prédéterminée relativement plus haute quand le véhicule est en situation de décélération, et dans une troisième fourchette prédéterminée intermédiaire entre les fourchettes haute et basse quand le véhicule est en situation de vitesse stabilisée, la tension de régulation (Vreg) étant fonction de la tension de consigne (Vcons) . 3. Device according to claim 2, characterized in that the regulating means (30) comprises a control manager (32) determining a target voltage (Vcons) in a first predetermined range relatively lower when the vehicle is in a position of acceleration, in a second, relatively higher predetermined range when the vehicle is in a deceleration state, and in a third predetermined range intermediate the high and low ranges when the vehicle is in steady speed, the regulating voltage (Vreg) depending on the setpoint voltage (Vcons).
4. Dispositif selon la revendication 3, caractérisé en ce qu'il comprend des moyens d'acquisition de la température courante de la batterie du véhicule (Tbatt) , et des moyens de protection (40) pour évaluer une tension de régulation de l'alternateur maximale acceptable (Vmax) en fonction de la température (Tbatt) acquise, la tension de régulation (Vreg) étant fonction du minimum entre la tension de consigne (Vcons) et la tension maximale (Vmax)4. Device according to claim 3, characterized in that it comprises means for acquiring the current temperature of the vehicle battery (Tbatt), and protection means (40) for evaluating a maximum acceptable alternator regulation voltage (Vmax) as a function of the acquired temperature (Tbatt), the control voltage (Vreg) being a function of the minimum between the target voltage ( Vcons) and the maximum voltage (Vmax)
5. Dispositif selon la revendication 4, caractérisé en ce qu'il comprend des moyens d'acquisition de la tension courante (Vbatt) aux bornes de la batterie du véhicule, et des moyens de bilan (50) pour évaluer la charge courante (Cbatt) de la batterie en fonction de la tension batterie (Vbatt) acquise, de la température (Tbatt) de la batterie acquise, et des tensions de régulation (Vreg) précédemment appliquées à l'alternateur, le gestionnaire de régulation (32) déterminant la tension de consigne (Vcons) dans une quatrième fourchette prédéterminée quand la charge de la batterie (Cbatt) est inférieure à un seuil prédéterminé .5. Device according to claim 4, characterized in that it comprises means for acquiring the current voltage (Vbatt) across the battery of the vehicle, and balance means (50) for evaluating the current load (Cbatt ) of the battery according to the acquired battery voltage (Vbatt), the temperature (Tbatt) of the battery acquired, and the regulation voltages (Vreg) previously applied to the alternator, the control manager (32) determining the setpoint voltage (Vcons) in a fourth predetermined range when the battery charge (Cbatt) is below a predetermined threshold.
6. Dispositif selon la revendication 5, caractérisé en ce que le gestionnaire de régulation (32) détermine la tension de consigne (Vcons) dans la quatrième fourchette prédéterminée également quand la tension de la batterie (Tbatt) est inférieure à un seuil prédéterminé.6. Device according to claim 5, characterized in that the control manager (32) determines the target voltage (Vcons) in the fourth predetermined range also when the battery voltage (Tbatt) is less than a predetermined threshold.
7. Dispositif selon l'une quelconque des revendications 5 à 6, caractérisé en ce qu'il comprend des moyens pour détecter si un consommateur (CS) sensible aux variations de la tension de la batterie (Vbatt) est actif, les moyens de régulation (30) déterminant alors directement une tension consommateur sensible (Vcs) dans une cinquième fourchette prédéterminée, sans mettre en jeu le gestionnaire de régulation (32) , la tension de régulation (Vreg) étant déterminée en fonction de ladite tension consommateur sensible (Vcs) .7. Device according to any one of claims 5 to 6, characterized in that it comprises means for detecting whether a consumer (CS) responsive to variations in the voltage of the battery (Vbatt) is active, the control means (30) then directly determining a sensible consumer voltage (Vcs) in a fifth predetermined range, without putting into play the regulator (32), the regulating voltage (Vreg) being determined as a function of said sensible consumer voltage (Vcs) .
8. Dispositif selon la revendication 7, caractérisé en ce que les moyens de régulation (30) comprennent des moyens de filtrage (33) recevant en entrée d'une part la tension minimum entre la tension de consigne (Vcons) et la tension maximale (Vmax) et d'autre part la tension consommateur sensible (Vcs) , et déterminant la tension de régulation (Vreg) en fonction des entrées de façon à maintenir les variations dans le temps de ladite tension de régulation (Vreg) inférieures à une pente prédéterminée .8. Device according to claim 7, characterized in that the regulating means (30) comprise filtering means (33) receiving as input on the one hand the minimum voltage between the set voltage (Vcons) and the maximum voltage (Vmax) and on the other hand the sensitive consumer voltage (Vcs), and determining the regulation voltage (Vreg) as a function of the inputs so as to maintain the variations over time of the said lower regulation voltage (Vreg). at a predetermined slope.
9. Dispositif selon l'une quelconque des revendications 3 à 8, caractérisé en ce que les situations de vie prédéterminées comprennent aussi la situation de mise en fonctionnement du moteur, le gestionnaire de régulation (32) déterminant la tension de consigne (Vcons) dans une sixième fourchette prédéterminée quand le véhicule est en situation de mise en fonctionnement du moteur. 9. Device according to any one of claims 3 to 8, characterized in that the predetermined life situations also include the operating situation of the engine, the control manager (32) determining the target voltage (Vcons) in a sixth predetermined range when the vehicle is in operation of the engine.
10. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que les variables représentatives de la situation courante du véhicule sont choisies parmi les variables disponibles dans un calculateur du véhicule automobile, et comprennent par exemple la position de la pédale d'accélérateur (P%) , la vitesse du véhicule (Vit) , l'accélération du véhicule (Ace) , l'état de l'injection (I) , l'état de la régulation de ralenti (R) , l'état de l'accouplement moteur thermique-boîte de vitesses (E) , et l'état du moteur thermique (M/A) .10. Device according to any one of the preceding claims, characterized in that the variables representative of the current situation of the vehicle are selected from the variables available in a motor vehicle computer, and include for example the position of the accelerator pedal. (P%), the vehicle speed (Vit), the vehicle acceleration (Ace), the state of the injection (I), the status of the idle control (R), the condition of the 'thermal engine-gearbox coupling (E), and the state of the engine (M / A).
11. Méthode de pilotage d'un alternateur de véhicule automobile consistant à déterminer la tension de régulation (Vreg) dudit alternateur en fonction de la situation de vie du véhicule, cette méthode comprenant les étapes suivantes :11. A method of driving a motor vehicle alternator comprising determining the regulation voltage (Vreg) of said alternator as a function of the vehicle life situation, this method comprising the following steps:
1/ acquisition d'une pluralité de variables (P%, Vit, Ace, I, R, E, M/A) représentatives de la situation courante du véhicule, 2/ évaluation, en fonction des variables (P%, Vit, Ace, I, R, E, M/A) acquises, si le véhicule se trouve dans une d'une pluralité de situations de vie prédéterminées, 3/ détermination de la tension de régulation (Vreg) de l'alternateur en fonction de la situation de vie prédéterminée dans laquelle se trouve le véhicule. 1 / acquisition of a plurality of variables (P%, Vit, Ace, I, R, E, M / A) representative of the current situation of the vehicle, 2 / evaluation, as a function of the variables (P%, Vit, Ace , I, R, E, M / A) acquired, if the vehicle is in one of a plurality of predetermined life situations, 3 / determination of the regulator voltage (Vreg) of the alternator as a function of the predetermined life situation in which the vehicle is located.
EP05800243A 2004-10-08 2005-09-20 Device for monitoring a motor vehicle alternator based on the life situation of said vehicle, and associated method Withdrawn EP1797627A1 (en)

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FR0410649A FR2876514B1 (en) 2004-10-08 2004-10-08 DEVICE FOR CONTROLLING A MOTOR VEHICLE ALTERNATOR IN ACCORDANCE WITH THE LIFE SITUATION OF THIS VEHICLE, AND ASSOCIATED METHOD
PCT/FR2005/050768 WO2006040486A1 (en) 2004-10-08 2005-09-20 Device for monitoring a motor vehicle alternator based on the life situation of said vehicle, and associated method

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US20070241723A1 (en) 2007-10-18

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