EP2132060A1 - Identification device for an automotive vehicle - Google Patents

Identification device for an automotive vehicle

Info

Publication number
EP2132060A1
EP2132060A1 EP08716995A EP08716995A EP2132060A1 EP 2132060 A1 EP2132060 A1 EP 2132060A1 EP 08716995 A EP08716995 A EP 08716995A EP 08716995 A EP08716995 A EP 08716995A EP 2132060 A1 EP2132060 A1 EP 2132060A1
Authority
EP
European Patent Office
Prior art keywords
source
unit
rechargeable
electronic unit
electronic
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Withdrawn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
EP08716995A
Other languages
German (de)
French (fr)
Inventor
Ciprian Musat
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.)
Valeo Comfort and Driving Assistance SAS
Original Assignee
Valeo Securite Habitacle SAS
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 Valeo Securite Habitacle SAS filed Critical Valeo Securite Habitacle SAS
Publication of EP2132060A1 publication Critical patent/EP2132060A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/20—Means to switch the anti-theft system on or off
    • B60R25/2009—Antitheft state indicator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/40—Features of the power supply for the anti-theft system, e.g. anti-theft batteries, back-up power supply or means to save battery power
    • B60R25/406—Power supply in the remote key
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • 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
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H02J2310/46—The network being an on-board power network, i.e. within a vehicle for ICE-powered road vehicles

Definitions

  • the present invention relates to an identification device for a motor vehicle, in particular it relates to the power management circuit of such a device.
  • the identification device for a vehicle also called “identifier” included only a mechanical key and a radiofrequency remote control associated with the vehicle to lock and unlock the vehicle, as well as an immobilizer in the form of a passive transponder which communicated with the on-board computer of the vehicle to authorize or not the start of the vehicle.
  • identifier only the remote control was energy consuming and a non-rechargeable battery could run for one year without failure.
  • the identifier incorporates additional functions for the user.
  • Such an additional function consists for example in a circuit for locating the vehicle, a display to show a certain amount of information on the state of the vehicle, such as, for example, the locking state, the internal temperature of the vehicle, the level fuel tank, the titles of the music pieces loaded into the vehicle audio system or other information, and if necessary control means for remote operation of selected circuits before taking the vehicle (for example a vehicle preheating circuit, windshield defrosting).
  • a vehicle preheating circuit, windshield defrosting for example a vehicle preheating circuit, windshield defrosting.
  • the battery is recharged too late and the battery no longer contains enough energy to operate all the features of the identifier, such as a display or bi-directional radio frequency power circuits.
  • the vital functions of the identifier such as remote control functions to lock and unlock the vehicle.
  • the long-lasting battery is discharged as and when each use of the remote control and it takes no benefit to have in the same housing a rechargeable battery.
  • S1 is meant a main source of energy such as a rechargeable battery capable of supplying all the functionalities of the identifier.
  • a non-rechargeable secondary backup source for example a simple electric battery, whose electrical charging capacities are only dimensioned to ensure the maintenance of vital functions (for example locking and unlocking by remote control) in case of unavailability of the main source of energy Sl.
  • the amount of energy stored in this source S2 is very low compared to that which can be stored in the source S1.
  • Two switches made for example by diodes D1 and D2, connect and disconnect the energy sources S1 and S2 to a charging circuit 1, that is to say the radio frequency circuit, the display and so on.
  • a charging circuit 1 that is to say the radio frequency circuit, the display and so on.
  • the source with the highest output voltage is connected to the load.
  • the energy lost in the switching circuit when made with single diodes, represents a significant fraction of the total available energy. This loss results in a significant decrease in the operating autonomy of an identifier thus powered.
  • the present invention aims at providing an optimized power management circuit for a stand-alone control module with first comfort features and second basic functions.
  • the subject of the invention is an identification device for a motor vehicle comprising at least a first electronic unit for performing at least one comfort function, at least a second electronic unit for performing at least one basic function, a rechargeable electrical source and a backup power source for supplying said electronic units, characterized in that it further comprises a charging state control unit of the rechargeable source and a switching unit having first and second inputs of connected power supply respectively to the rechargeable source and the backup source, a control input connected to an associated output of said control unit and a power output connected to said second electronic unit, the switching unit comprising a switch isolating said source backup when the charging state of said rechargeable source is greater than or equal to a predefined threshold and connecting this backup source to said second electronic unit when the charging state of said rechargeable source is below a predefined threshold to ensure the power supply of the second unit to perform the basic functions.
  • FIG. 1 shows a block diagram of a management circuit of FIG. 2 shows a diagram of an identification device according to the invention
  • FIG. 3 shows a block diagram of various components of the identification device according to the invention
  • FIG. 4 shows a block diagram of a power management circuit according to the invention.
  • FIG. 2 shows a diagram of an identification device 3 according to the invention.
  • This device 3 is in the form of a badge also called identifier, and further comprises an information display 5 (for example an LCD screen), control buttons, for example a button 7 for locking the vehicle, an 9 button unlocking the vehicle, a trunk opening button 11 and a touch interface 13, for example to navigate a menu displayed on the display 5.
  • an information display 5 for example an LCD screen
  • control buttons for example a button 7 for locking the vehicle, an 9 button unlocking the vehicle, a trunk opening button 11 and a touch interface 13, for example to navigate a menu displayed on the display 5.
  • FIG. 3 shows a block diagram of various components of the identification device according to the invention.
  • the identification device comprises at least a first electronic unit 15 for performing at least one function of comfort and at least a second electronic unit 17 for performing at least one basic function.
  • comfort function and basic function are defined relative to each other, that is to say we introduce a certain hierarchy in the functions.
  • a basic function is a function that is considered to be a priority and that must be ensured as long as possible. Conversely, it is accepted under certain conditions that a function of comfort is no longer assured.
  • the remote control function with its radio frequency transmission circuit 19 with a range of about 5m, that is to say the remote control circuit to lock and unlock a motor vehicle is a basic function.
  • the long-range bidirectional radiocommunication stage 21 (up to about 300 m), the information display 5, the information acquisition interface 13 such as a keyboard or a touch interface, and / or a socket 23 for a universal serial bus (commonly known as USB socket for "Universal Bus Series") are considered comfort functions, that is to say that one accepts, for example if the sources power supply are too weak, that their operation is no longer assured.
  • a universal serial bus commonly known as USB socket for "Universal Bus Series
  • a rechargeable electrical source Sl for example a rechargeable LI-ION cell having an output voltage of between 3V and 4.2V and an emergency electrical source, for example an Lithium battery having an output voltage of between 2.7V and 3.3V.
  • the backup source S2 can supply only the unit 17 to carry out at least one basic function.
  • the identification device according to the invention comprises a unit 25 for controlling the state of charge of the rechargeable source and a switching unit 27.
  • the state of charge control unit 25 comprises for example a microcontroller connected only to the rechargeable source Sl for its operation.
  • the microcontroller forms in itself the control unit
  • this microprocessor 25 manages, processes and operates all the electronic units 5, 13, 21, 23 for performing comfort functions.
  • the microcontroller comprises an output 29 which is connected to a corresponding control input of the switching unit
  • the switching unit 27 has a first 31 and second 33 power inputs respectively connected to the rechargeable source Sl and the backup source S2. As already mentioned above, a control input 35 is connected to the associated output 29 of said control unit 25.
  • a power output 37 is connected to said second electronic unit 17.
  • the unit 27 comprises an adder forming circuit portion 38 with two diodes D1 and D2 whose output is connected to said second electronic unit 17.
  • the diodes D1 and D2 are Schottky type diodes so as to consume virtually no energy.
  • the switching unit 27 comprises a switch 39 whose position depends on the signal at the input 35 of the switching unit.
  • This switch is for example made by a JFET transistor also called depletion MOS transistor. These transistors have the advantage of not consuming any energy in the active state.
  • the switch 39 In the open position, that is to say when the state of charge of said rechargeable source Sl is greater than or equal to a predefined threshold, the switch 39 is in the open position so as to completely isolate the backup source S2.
  • the predefined threshold corresponds to the operating threshold of the microcontroller.
  • the switch 39 branches this backup source S2 to the second electronic unit 17, preferably via the adder circuit 38 to provide power to the second unit 17 to perform the basic functions.
  • the microcontroller operates normally and all the functions of the identification device are provided by a power supply from the source Sl, that is to say, the comfort functions as well as the basic functions. During this time, the output 29 of the microcontroller is active and the switch 39 in the open position.
  • the backup source is preserved to the maximum, thus ensuring a long life of about 2 years and more to the backup battery.

Abstract

The invention relates to an identification device (3) for an automotive vehicle that comprises : at least one first electronic unit (15) for realising at least one comfort function; at least one second electronic unit (17) for realising at least one base function; a rechargeable electric source (S1) and a backup electric source (S2) for supplying said electronic units (15, 17). The device further includes a unit (25) for controlling the charge state of the rechargeable source, and a switching unit (27) having first (31) and second (33) supply inputs respectively connected to the rechargeable source (S1) and to the backup source (S2), a control input (35) connected to a related output (29) of said control unit (25) and a supply output (37) connected to said second electronic unit (17), wherein the switching unit (27) includes a switch (39) for insulating said backup source (S2) when the charge state of the rechargeable source is higher than or equal to a predetermined threshold, and for connecting said backup source (S2) to said second electronic unit when the charge state of said rechargeable source is lower than a predetermined threshold in order to supply the second unit (17) for realising the base functions.

Description

Dispositif d'identification pouf un véhicule automobile Identification device for a motor vehicle
La présente invention est relative à un dispositif d'identification pour un véhicule automobile, en particulier elle concerne le circuit de gestion d'alimentation d'un tel dispositif. De ces jours, les fonctionnalités des produits électroniques du type « nomade », c'est-à-dire des produits qu'un utilisateur porte sur soi comme par exemple des téléphones mobiles, des lecteurs MP3, des télécommandes pour verrouiller et déverrouiller par exemple un véhicule automobile, sont de plus en plus étendues.The present invention relates to an identification device for a motor vehicle, in particular it relates to the power management circuit of such a device. These days, the features of electronic products of the "nomadic" type, that is to say products that a user carries on oneself as for example mobile phones, MP3 players, remotes to lock and unlock for example a motor vehicle, are more and more extensive.
Ainsi, il y a un certain nombre d'années, le dispositif d'identification pour un véhicule également appelé « identifiant » ne comportait qu'une clé conforme mécanique et une télécommande radiofréquence associées au véhicule pour verrouiller et déverrouiller le véhicule, ainsi qu'un immobiliseur sous forme d'un transpondeur passif qui communiquait avec l'ordinateur de bord du véhicule pour autoriser ou non le démarrage du véhicule. Dans cet identifiant, seule la télécommande était consommatrice d'énergie et une pile non rechargeable pouvait fonctionner un an sans défaillance.Thus, a number of years ago, the identification device for a vehicle also called "identifier" included only a mechanical key and a radiofrequency remote control associated with the vehicle to lock and unlock the vehicle, as well as an immobilizer in the form of a passive transponder which communicated with the on-board computer of the vehicle to authorize or not the start of the vehicle. In this identifier, only the remote control was energy consuming and a non-rechargeable battery could run for one year without failure.
Or aujourd'hui, l'identifiant incorpore des fonctions supplémentaires pour l'utilisateur. Une telle fonction supplémentaire consiste par exemple en un circuit permettant de localiser le véhicule, un afficheur pour montrer un certain nombre d'informations sur l'état du véhicule, comme par exemple l'état de verrouillage, la température interne du véhicule, le niveau du réservoir de carburant, les titres des morceaux de musique chargés dans le système audio du véhicule ou encore d'autres informations, et le cas échéant des moyens de commande pour faire fonctionner à distance des circuits choisis avant de prendre le véhicule (par exemple un circuit de préchauffage du véhicule, le dégivrage du pare-brise). De tels identifiants avec des fonctionnalités élargies contribuent au bien être du conducteur et de ses passagers par une augmentation considérable du confort.Nowadays, the identifier incorporates additional functions for the user. Such an additional function consists for example in a circuit for locating the vehicle, a display to show a certain amount of information on the state of the vehicle, such as, for example, the locking state, the internal temperature of the vehicle, the level fuel tank, the titles of the music pieces loaded into the vehicle audio system or other information, and if necessary control means for remote operation of selected circuits before taking the vehicle (for example a vehicle preheating circuit, windshield defrosting). Such identifiers with extended functionalities contribute to the well-being of the driver and his passengers by a considerable increase in comfort.
Or, ces nouvelles fonctionnalités sont généralement réalisés par l'intermédiaire de circuits électroniques, en particulier des circuits radiofréquence bidirectionnels de puissance communiquant sur une distance de plusieurs centaines de mètres (jusqu'à plus de 300m) avec le véhicule et un écran d'affichage par exemple de type LCD ayant une consommation importante d'énergie électrique. C'est pourquoi de tels identifiants sont munis d'accumulateurs rechargeables et lorsque le conducteur entre dans son véhicule, il place l'identifiant dans un emplacement prédéfini qui sert en même temps de station de recharge, par exemple via un circuit inductif.However, these new functionalities are generally realized by means of electronic circuits, in particular bidirectional radiofrequency circuits of power communicating over a distance of several hundred meters (up to 300m) with the vehicle and a display screen for example LCD type having a large consumption of electrical energy. This is why such identifiers are provided with rechargeable accumulators and when the driver enters his vehicle, he places the identifier in a predefined location which serves at the same time charging station, for example via an inductive circuit.
Cependant, par exemple après une absence prolongée lorsque l'utilisateur laisse son véhicule dans un garage ou pour des systèmes d'accès à mains libres pour lesquels il n'est plus nécessaire de placer l'identifiant dans un emplacement prédéfini, il se peut que la recharge de l'accumulateur intervient trop tard et que ce dernier ne contient plus assez d'énergie pour faire fonctionner toutes les fonctionnalités de l'identifiant, comme par exemple un afficheur ou les circuits radiofréquence bidirectionnels de puissance.However, for example after a prolonged absence when the user leaves his vehicle in a garage or for hands-free access systems for which it is no longer necessary to place the identifier in a predefined location, it may be that the battery is recharged too late and the battery no longer contains enough energy to operate all the features of the identifier, such as a display or bi-directional radio frequency power circuits.
Dans ces conditions, il est nécessaire de pouvoir assurer dans la durée les fonctions vitales de l'identifiant comme par exemple les fonctions de télécommande pour verrouiller et déverrouiller le véhicule. Pour ce faire, il est connu d'équiper l'identifiant de deux sources d'énergie indépendantes, par exemple un accumulateur rechargeable pour les fonctions dites de « confort » et une pile longue durée pour la fonction télécommande.Under these conditions, it is necessary to be able to ensure in the long term the vital functions of the identifier such as remote control functions to lock and unlock the vehicle. To do this, it is known to equip the identifier with two independent sources of energy, for example a rechargeable battery for the so-called "comfort" functions and a long-lasting battery for the remote control function.
Toutefois, dans cette configuration, la pile longue durée se décharge au fur et à mesure à chaque utilisation de la télécommande et on ne tire aucun bénéfice de disposer dans un même boîtier d'un accumulateur rechargeable. De plus, il est nécessaire de prévoir une pile ayant une grande capacité de stockage d'énergie électrique ce qui revient assez cher.However, in this configuration, the long-lasting battery is discharged as and when each use of the remote control and it takes no benefit to have in the same housing a rechargeable battery. In addition, it is necessary to provide a battery having a large capacity for storing electrical energy which is quite expensive.
Dans une version optimisée, on connaît des circuits de gestion d'alimentation ayant un accumulateur rechargeable d'une part et une pile de secours d'autre part qui sont couplés via un circuit additionneur à diodes, comme cela est représenté sur le figure 1.In an optimized version, there are known power management circuits having a rechargeable battery on the one hand and a backup battery on the other hand which are coupled via a diode adder circuit, as shown in Figure 1.
Par Sl, on désigne une source principale d'énergie tel qu'un accumulateur rechargeable apte à assurer l'alimentation de l'ensemble des fonctionnalités de l'identifiant.By S1, is meant a main source of energy such as a rechargeable battery capable of supplying all the functionalities of the identifier.
Par S2, on désigne une source secondaire de secours non-rechargeable, par exemple une simple pile électrique, dont les capacités de charge électrique sont seulement dimensionnées pour assurer le maintien des fonctions vitales (par exemple de verrouillage et déverrouillage par télécommande) en cas d'indisponibilité de la source principale d'énergie Sl. La quantité d'énergie stockée dans cette source S2 est très faible au regard de celle pouvant être stockée dans la source Sl.By S2, a non-rechargeable secondary backup source, for example a simple electric battery, whose electrical charging capacities are only dimensioned to ensure the maintenance of vital functions (for example locking and unlocking by remote control) in case of unavailability of the main source of energy Sl. The amount of energy stored in this source S2 is very low compared to that which can be stored in the source S1.
Deux interrupteurs réalisés par exemple par des diodes Dl et D2, connectent et déconnectent les sources d'énergie Sl et S2 à un circuit de charge 1, c'est-à-dire le circuit radiofréquence, l'afficheur etc. Ainsi, le critère de sélection de la source fournissant l'énergie au circuit de charge 1 est simplement le niveau de tension des sources Sl et S2.Two switches made for example by diodes D1 and D2, connect and disconnect the energy sources S1 and S2 to a charging circuit 1, that is to say the radio frequency circuit, the display and so on. Thus, the criterion for selecting the source supplying the energy to the load circuit 1 is simply the voltage level of the sources S1 and S2.
La source ayant la tension de sortie la plus élevée est connectée à la charge.The source with the highest output voltage is connected to the load.
Bien que la gestion de l'alimentation électrique soit plus avantageuse que les circuits complètement séparés, ce mode de réalisation présente certaines limitations.Although the management of the power supply is more advantageous than the completely separate circuits, this embodiment has certain limitations.
En effet, il n'y a pas de contrôle sur la sélection de la source d'énergie à débiter, et par conséquent les deux sources se déchargent simultanément. On ne peut pas empêcher la consommation à partir de la source S2 avant que la source Sl soit complètement épuisée. La source S2 se trouve donc déchargée en même temps que la source principale, Sl et donc celle-ci ne remplit plus son rôle de secours, c'est-à-dire qu'elle est disponible à 100% quand la source Sl est proche de l'épuisement.Indeed, there is no control over the selection of the energy source to be discharged, and therefore the two sources are discharged simultaneously. One can not prevent the consumption from the source S2 before the source Sl is completely exhausted. The source S2 is thus discharged at the same time as the main source, Sl and thus it no longer fulfills its role of relief, that is to say that it is available at 100% when the source Sl is close of exhaustion.
De plus, l'énergie perdue dans le circuit de commutation, lorsqu'il est réalisé avec des diodes simples, représente une fraction importante de l'énergie totale disponible. Cette perte se traduit par une diminution significative de l'autonomie de fonctionnement d'un identifiant ainsi alimenté.In addition, the energy lost in the switching circuit, when made with single diodes, represents a significant fraction of the total available energy. This loss results in a significant decrease in the operating autonomy of an identifier thus powered.
La présente invention vise à proposer un circuit de gestion de l'alimentation optimisé pour un module de commande autonome avec des premières fonctionnalités de confort et des secondes fonctionnalités de base.The present invention aims at providing an optimized power management circuit for a stand-alone control module with first comfort features and second basic functions.
A cet effet, l'invention a pour objet un dispositif d'identification pour véhicule automobile comprenant au moins une première unité électronique pour réaliser au moins une fonction de confort, au moins une seconde unité électronique pour réaliser au moins une fonction de base, une source électrique rechargeable et une source électrique de secours pour alimenter lesdites unités électroniques, caractérisé en ce qu'il comprend en outre une unité de contrôle de l'état de charge de la source rechargeable et une unité de commutation ayant des première et seconde entrées d'alimentation connectées respectivement à la source rechargeable et à la source de secours, une entrée de commande connectée à une sortie associée de ladite unité de contrôle et une sortie d'alimentation connectée à ladite seconde unité électronique, l'unité de commutation comprenant un commutateur isolant ladite source de secours lorsque l'état de charge de ladite source rechargeable est supérieur ou égal à un seuil prédéfini et branchant cette source de secours à ladite seconde unité électronique lorsque l'état de charge de ladite source rechargeable est inférieur à un seuil prédéfini pour assurer l'alimentation électrique de la seconde unité permettant de réaliser les fonctions de base.For this purpose, the subject of the invention is an identification device for a motor vehicle comprising at least a first electronic unit for performing at least one comfort function, at least a second electronic unit for performing at least one basic function, a rechargeable electrical source and a backup power source for supplying said electronic units, characterized in that it further comprises a charging state control unit of the rechargeable source and a switching unit having first and second inputs of connected power supply respectively to the rechargeable source and the backup source, a control input connected to an associated output of said control unit and a power output connected to said second electronic unit, the switching unit comprising a switch isolating said source backup when the charging state of said rechargeable source is greater than or equal to a predefined threshold and connecting this backup source to said second electronic unit when the charging state of said rechargeable source is below a predefined threshold to ensure the power supply of the second unit to perform the basic functions.
D'autres caractéristiques et avantages de l'invention ressortiront de la description suivante, donnée à titre d'exemple, sans caractère limitatif, en regard des dessins annexés sur lesquels : la figure 1 montre un schéma synoptique d'un circuit de gestion d'alimentation connu de l'état de la technique, la figure 2 montre un schéma d'un dispositif d'identification selon l'invention, - la figure 3 montre un schéma bloc de divers composants du dispositif d'identification selon l'invention, et la figure 4 montre un schéma synoptique d'un circuit de gestion d'alimentation selon l'invention.Other characteristics and advantages of the invention will emerge from the following description, given by way of example, without limitation, with reference to the accompanying drawings, in which: FIG. 1 shows a block diagram of a management circuit of FIG. 2 shows a diagram of an identification device according to the invention; FIG. 3 shows a block diagram of various components of the identification device according to the invention, and FIG. 4 shows a block diagram of a power management circuit according to the invention.
La figure 2 montre un schéma d'un dispositif 3 d'identification selon l'invention.Figure 2 shows a diagram of an identification device 3 according to the invention.
Ce dispositif 3 se présente sous la forme d'un badge aussi appelé identifiant, et comporte en outre un afficheur d'informations 5 (par exemple un écran LCD), des boutons de commande, par exemple un bouton 7 de verrouillage du véhicule, un bouton 9 de déverrouillage du véhicule, un bouton d'ouverture du coffre 11 et une interface tactile 13, permettant par exemple de naviguer dans un menu affiché sur l'afficheur 5.This device 3 is in the form of a badge also called identifier, and further comprises an information display 5 (for example an LCD screen), control buttons, for example a button 7 for locking the vehicle, an 9 button unlocking the vehicle, a trunk opening button 11 and a touch interface 13, for example to navigate a menu displayed on the display 5.
La figure 3 montre un schéma bloc de divers composants du dispositif d'identification selon l'invention.Figure 3 shows a block diagram of various components of the identification device according to the invention.
En particulier, le dispositif d'identification selon l'invention comprend au moins une première unité électronique 15 pour réaliser au moins une fonction de confort et au moins une seconde unité électronique 17 pour réaliser au moins une fonction de base.In particular, the identification device according to the invention comprises at least a first electronic unit 15 for performing at least one function of comfort and at least a second electronic unit 17 for performing at least one basic function.
Les termes de fonction de confort et fonction de base se définissent l'un par rapport à l'autre, c'est-à-dire on introduit une certaine hiérarchisation dans les fonctions. En pratique, une fonction de base est une fonction que l'on estime prioritaire et qui doit pouvoir être assurée le plus longtemps possible. A l'inverse, on accepte sous certaines conditions qu'une fonction de confort n'est plus assurée.The terms of comfort function and basic function are defined relative to each other, that is to say we introduce a certain hierarchy in the functions. In practice, a basic function is a function that is considered to be a priority and that must be ensured as long as possible. Conversely, it is accepted under certain conditions that a function of comfort is no longer assured.
Concrètement, pour un dispositif d'identification selon un mode non limitatif de réalisation, la fonction de télécommande avec son circuit d'émission radio fréquence 19 avec une portée d'environ 5m, c'est-à-dire le circuit de télécommande pour verrouiller et déverrouiller un véhicule automobile, est une fonction de base.Specifically, for an identification device according to a non-limiting embodiment, the remote control function with its radio frequency transmission circuit 19 with a range of about 5m, that is to say the remote control circuit to lock and unlock a motor vehicle, is a basic function.
En revanche, l'étage 21 de radiocommunication bidirectionnelle longue portée (jusqu'à 300m environ), l'afficheur d'informations 5, l'interface de saisie d'informations 13 tel qu'un clavier ou une interface tactile, et/ou une prise 23 pour un bus de série universel (généralement connu sous le nom prise USB pour « Universal Séries Bus ») sont considérés comme des fonctions de confort, c'est-à- dire que l'on accepte, par exemple si les sources d'alimentation électriques sont trop faibles, que leur fonctionnement n'est plus assuré.On the other hand, the long-range bidirectional radiocommunication stage 21 (up to about 300 m), the information display 5, the information acquisition interface 13 such as a keyboard or a touch interface, and / or a socket 23 for a universal serial bus (commonly known as USB socket for "Universal Bus Series") are considered comfort functions, that is to say that one accepts, for example if the sources power supply are too weak, that their operation is no longer assured.
Pour alimenter lesdites unités électroniques 15 et 17, on a également représenté sur cette figure 3 une source électrique rechargeable Sl par exemple une pile LI-ION rechargeable présentant une tension de sortie comprise entre 3V et 4,2 V et une source électrique de secours, par exemple une pile Lithium ayant une tension de sortie comprise entre 2,7V et 3,3V.To supply said electronic units 15 and 17, there is also shown in this FIG. 3 a rechargeable electrical source Sl, for example a rechargeable LI-ION cell having an output voltage of between 3V and 4.2V and an emergency electrical source, for example an Lithium battery having an output voltage of between 2.7V and 3.3V.
Le branchement des sources d'alimentation électrique est détaillé à la figure 4.The connection of the power sources is detailed in Figure 4.
Comme on le voit sur cette figure 4, la source de secours S2 ne peut alimenter que l'unité 17 pour réaliser au moins une fonction de base. Outre les sources Sl, S2 ainsi que les unités électroniques 15 et 17, le dispositif d'identification selon l'invention comprend une unité 25 de contrôle de l'état de charge de la source rechargeable et une unité de commutation 27.As can be seen in this FIG. 4, the backup source S2 can supply only the unit 17 to carry out at least one basic function. In addition to the sources S1, S2 and the electronic units 15 and 17, the identification device according to the invention comprises a unit 25 for controlling the state of charge of the rechargeable source and a switching unit 27.
L'unité 25 de contrôle de l'état de charge comprend par exemple un microcontrôleur connectée uniquement à la source rechargeable Sl pour son fonctionnement. Ainsi, le microcontrôleur forme en lui-même l'unité de contrôleThe state of charge control unit 25 comprises for example a microcontroller connected only to the rechargeable source Sl for its operation. Thus, the microcontroller forms in itself the control unit
25, c'est-à-dire, lorsque l'état de charge de la source rechargeable Sl est satisfaisant, le microcontrôleur fonctionne normalement, tandis que lorsque l'état de charge de la source rechargeable Sl est insatisfaisant, le microcontrôleur cesse de fonctionner.25, that is to say, when the state of charge of the rechargeable source Sl is satisfactory, the microcontroller operates normally, whereas when the state of charge of the rechargeable source Sl is unsatisfactory, the microcontroller stops working .
En outre, ce microprocesseur 25 gère, traite et fait fonctionner toutes les unités électroniques 5, 13, 21, 23 permettant de réaliser des fonctions de confort.In addition, this microprocessor 25 manages, processes and operates all the electronic units 5, 13, 21, 23 for performing comfort functions.
Il est donc clair que si l'état de charge de la source rechargeable Sl est insatisfaisant et que le microcontrôleur cesse de fonctionner, les fonctions de confort cessent également d'être opérationnelles. L'utilisateur est donc privé de fait des fonctions de confort suite à l'arrêt de fonctionnement du microcontrôleur.It is therefore clear that if the state of charge of the rechargeable source Sl is unsatisfactory and the microcontroller stops working, the comfort functions also cease to be operational. The user is therefore deprived of comfort functions in fact following the shutdown of the microcontroller.
De préférence, le microcontrôleur comprend une sortie 29 qui est connectée à une entrée de commande correspondante de l'unité de commutationPreferably, the microcontroller comprises an output 29 which is connected to a corresponding control input of the switching unit
27 et qui est configurée de manière à changer d'état logique lorsque la tension d'alimentation est inférieure au seuil de fonctionnement du microcontrôleur. En d'autres termes, si le microcontrôleur n'est plus suffisamment alimenté, il cesse de fonctionner et la sortie 29 change d'état logique (par exemple en haute impédance).27 and which is configured to change logic state when the supply voltage is below the operating threshold of the microcontroller. In other words, if the microcontroller is no longer sufficiently powered, it stops working and the output 29 changes logic state (for example high impedance).
L'unité de commutation 27 présente une première 31 et seconde 33 entrées d'alimentation connectées respectivement à la source rechargeable Sl et à la source de secours S2. Comme déjà évoqué précédemment, une entrée de commande 35 est connectée à la sortie 29 associée de ladite unité de contrôle 25.The switching unit 27 has a first 31 and second 33 power inputs respectively connected to the rechargeable source Sl and the backup source S2. As already mentioned above, a control input 35 is connected to the associated output 29 of said control unit 25.
Une sortie d'alimentation 37 est connectée à ladite seconde unité électronique 17. Pour réunir les deux entrées 31 et 33 vers la sortie 37, l'unité 27 comprend une partie de circuit 38 formant additionneur avec deux diodes Dl et D2 dont la sortie est connectée à ladite seconde unité électronique 17. Selon un mode de réalisation non limitatif, les diodes Dl et D2 sont des diodes du type Schottky de manière à consommer pratiquement pas d'énergie.A power output 37 is connected to said second electronic unit 17. To join the two inputs 31 and 33 to the output 37, the unit 27 comprises an adder forming circuit portion 38 with two diodes D1 and D2 whose output is connected to said second electronic unit 17. According to a non-limiting embodiment, the diodes D1 and D2 are Schottky type diodes so as to consume virtually no energy.
L'unité de commutation 27 comprend un commutateur 39 dont la position dépend du signal à l'entrée 35 de l'unité de commutation. Ce commutateur est par exemple réalisé par un transistor JFET aussi appelé transistor MOS à déplétion. Ces transistors ont pour avantage de ne consommer aucune énergie à l'état actif.The switching unit 27 comprises a switch 39 whose position depends on the signal at the input 35 of the switching unit. This switch is for example made by a JFET transistor also called depletion MOS transistor. These transistors have the advantage of not consuming any energy in the active state.
En position ouverte, c'est-à-dire lorsque l'état de charge de ladite source rechargeable Sl est supérieur ou égal à un seuil prédéfini, le commutateur 39 est en position ouverte de manière à isoler complètement la source de secours S2. Le seuil prédéfini correspond au seuil de fonctionnement du microcontrôleur.In the open position, that is to say when the state of charge of said rechargeable source Sl is greater than or equal to a predefined threshold, the switch 39 is in the open position so as to completely isolate the backup source S2. The predefined threshold corresponds to the operating threshold of the microcontroller.
En position fermée, c'est-à-dire lorsque l'état de charge de ladite source rechargeable est inférieur au seuil prédéfini (c'est-à-dire inférieur au seuil de fonctionnement du microcontrôleur qui cesse donc de fonctionner), le commutateur 39 branche cette source de secours S2 à la seconde unité électronique 17, de préférence via le circuit additionneur 38 pour assurer l'alimentation électrique de la seconde unité 17 permettant de réaliser les fonctions de base. Le fonctionnement du dispositif d'identification selon l'invention est le suivant :In the closed position, that is to say when the state of charge of said rechargeable source is below the predefined threshold (that is to say below the operating threshold of the microcontroller which therefore stops working), the switch 39 branches this backup source S2 to the second electronic unit 17, preferably via the adder circuit 38 to provide power to the second unit 17 to perform the basic functions. The operation of the identification device according to the invention is as follows:
Supposons que Sl est complètement chargée et présente donc une tension en sortie d'environ 4,2V. Dans ce cas, le microcontrôleur fonctionne normalement et toutes les fonctions du dispositif d'identification sont assurées par une alimentation électrique depuis la source Sl, c'est-à-dire aussi bien les fonctions de confort que les fonctions de base. Pendant ce temps, la sortie 29 du microcontrôleur est active et le commutateur 39 en position ouverte.Assume that Sl is fully charged and therefore has an output voltage of about 4.2V. In this case, the microcontroller operates normally and all the functions of the identification device are provided by a power supply from the source Sl, that is to say, the comfort functions as well as the basic functions. During this time, the output 29 of the microcontroller is active and the switch 39 in the open position.
Ainsi, on assure que la source de secours est complètement isolée et préservée des circuits électriques. Sans rechargement de la source Sl, la tension de sortie de Sl diminue jusqu'à atteindre par exemple environ 3,3V. A ce moment, la tension est trop faible pour faire fonctionner le microcontrôleur et celui-ci va cesser de fonctionner, provoquant ainsi la commutation dudit commutateur 39 pour le branchement de ladite pile de secours S2 à ladite seconde unité électronique 17.Thus, it is ensured that the emergency source is completely isolated and preserved from the electrical circuits. Without reloading the source Sl, the output voltage of Sl decreases to about 3.3V, for example. At this moment, the tension is too low to operate the microcontroller and it will stop working, thereby causing switching of said switch 39 for the connection of said backup battery S2 to said second electronic unit 17.
A ce stade, comme la tension en sortie de Sl (environ 3,3V) est proche de celle de S2 (environ 3V) et comme la tension minimum nécessaire pour faire fonctionner la télécommande de l'unité 17 est d'environ 2,7V, l'alimentation est dans un premier stade assurée par la source Sl et progressivement par S2 le circuit additionneur.At this point, as the output voltage of Sl (about 3.3V) is close to that of S2 (about 3V) and as the minimum voltage needed to operate the remote control unit 17 is about 2.7V , the feed is in a first stage provided by the source Sl and gradually by S2 the adder circuit.
De cette manière et conformément à l'esprit de l'invention, on décharge au maximum Sl avant d'utiliser seul S2 pour augmenter au maximum l'autonomie de l'identifiant.In this way and in accordance with the spirit of the invention, it discharges at most Sl before using only S2 to maximize the autonomy of the identifier.
Ceci permet de dimensionner la pile plus petite, ce qui réduit son encombrement et son coût de revient.This makes it possible to size the smaller battery, which reduces its size and its cost price.
C'est seulement quand la tension de sortie de Sl est inférieure à celle de S2, que la source de secours va effectivement alimenter seul le circuit de la télécommande.Only when the output voltage of Sl is lower than that of S2, the backup source will actually feed only the circuit of the remote control.
On comprend donc que la source de secours est préservée au maximum, garantissant ainsi une durée de vie importante d'environ 2 ans et plus à la pile de secours. It is therefore understandable that the backup source is preserved to the maximum, thus ensuring a long life of about 2 years and more to the backup battery.

Claims

REVENDICATIONS
1. Dispositif d'identification(3) pour véhicule automobile comprenant1. Identification device (3) for a motor vehicle comprising
- au moins une première unité électronique (15) pour réaliser au moins une fonction de confort,at least one first electronic unit (15) for performing at least one comfort function,
- au moins une seconde unité électronique (17) pour réaliser au moins une fonction de base,at least one second electronic unit (17) for performing at least one basic function,
- une source électrique rechargeable (Sl) et une source électrique de secours (S2) pour alimenter lesdites unités électroniques (15,17), caractérisé en ce qu'il comprend en outre une unité (25) de contrôle de l'état de charge de la source rechargeable et une unité (27) de commutation ayant des première (31) et seconde (33) entrées d'alimentation connectées respectivement à la source rechargeable (Sl) et à la source de secours (S2), une entrée de commande (35) connectée à une sortie associée (29) de ladite unité de contrôle (25) et une sortie d'alimentation (37) connectée à ladite seconde unité électronique (17), l'unité de commutation (27) comprenant un commutateur (39) isolant ladite source de secours (S2) lorsque l'état de charge ladite source rechargeable est supérieur ou égal à un seuil prédéfini et branchant cette source de secours (S2) à ladite seconde unité électronique lorsque l'état de charge de ladite source rechargeable est inférieur à un seuil prédéfini pour assurer l'alimentation électrique de la seconde unité (17) permettant de réaliser les fonctions de base.a rechargeable electric source (Sl) and an emergency electrical source (S2) for supplying said electronic units (15, 17), characterized in that it further comprises a charge state control unit (25). of the rechargeable source and a switching unit (27) having first (31) and second (33) power inputs respectively connected to the rechargeable source (Sl) and to the backup source (S2), a control input (35) connected to an associated output (29) of said control unit (25) and a power output (37) connected to said second electronic unit (17), the switching unit (27) comprising a switch ( 39) isolating said backup source (S2) when the charging state said rechargeable source is greater than or equal to a predefined threshold and connecting this backup source (S2) to said second electronic unit when the state of charge of said source rechargeable is less than u n predefined threshold to provide power to the second unit (17) to perform the basic functions.
2. Dispositif d'identification selon la revendication 1, caractérisé en ce que l'unité de contrôle (25) comprend un microcontrôleur connecté uniquement à la source rechargeable (Sl) pour son fonctionnement.2. Identification device according to claim 1, characterized in that the control unit (25) comprises a microcontroller connected only to the rechargeable source (Sl) for its operation.
3. Dispositif selon la revendication 2, caractérisé en ce que la sortie (29) du microcontrôleur connectée à ladite entrée (35) de commande de l'unité de commutation (27) est configurée de manière à changer d'état logique lorsque la tension d'alimentation est inférieure au seuil de fonctionnement du microcontrôleur, provoquant ainsi la commutation dudit commutateur (39) pour le branchement de ladite source de secours (S2) à ladite seconde unité électronique (17).3. Device according to claim 2, characterized in that the output (29) of the microcontroller connected to said control input (35) of the switching unit (27) is configured to change logic state when the voltage supply is below the operating threshold of the microcontroller, thereby causing said switch to switch (39) for connecting said backup source (S2) to said second electronic unit (17).
4. Dispositif d'identification selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la première unité électronique (15) comprend un étage (21) de radiocommunication bidirectionnelle longue portée et/ou un afficheur4. Identification device according to any one of claims 1 to 3, characterized in that the first electronic unit (15) comprises a stage (21) of long-range bidirectional radiocommunication and / or a display
(5) d'informations et/ou une interface (13) de saisie d'informations tel qu'un clavier ou une interface tactile, et/ou une prise (23) pour un bus de série universel.(5) information and / or an information input interface (13) such as a keyboard or a touch interface, and / or a socket (23) for a universal serial bus.
5. Dispositif d'identification selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite seconde unité électronique (17) comprend un circuit (19) d'émission radio fréquence courte portée, en particulier un circuit de télécommande pour verrouiller et déverrouiller un véhicule automobile.5. Identification device according to any one of the preceding claims, characterized in that said second electronic unit (17) comprises a short-range radio frequency transmission circuit (19), in particular a remote control circuit for locking and unlocking. a motor vehicle.
6. Dispositif d'identification selon l'une quelconque des revendications 1 à 5, caractérisé en ce que l'unité de commutation (27) comprend en outre une partie de circuit formant additionneur (38) avec deux diodes (Dl, D2) dont la sortie est connectée à ladite seconde unité électronique (17).Identification device according to one of claims 1 to 5, characterized in that the switching unit (27) further comprises an adder circuit section (38) with two diodes (D1, D2) of which the output is connected to said second electronic unit (17).
7. Dispositif selon la revendication 6, caractérisé en ce que les diodes (Dl, D2) sont des diodes du type Schottky. 7. Device according to claim 6, characterized in that the diodes (D1, D2) are Schottky type diodes.
8. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que le seuil prédéfini correspond au seuil de fonctionnement du microcontrôleur.8. Device according to any one of the preceding claims, characterized in that the predefined threshold corresponds to the operating threshold of the microcontroller.
9. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'unité de contrôle (25) gère les unités électroniques de confort (5, 13, 21, 23).9. Device according to any one of the preceding claims, characterized in that the control unit (25) manages the electronic comfort units (5, 13, 21, 23).
10. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que le commutateur (39) est un transistor JFET, c'est-à-dire un transistor MOSFET à déplétion. 10. Device according to any one of the preceding claims, characterized in that the switch (39) is a JFET transistor, that is to say a depletion MOSFET transistor.
EP08716995A 2007-02-20 2008-02-20 Identification device for an automotive vehicle Withdrawn EP2132060A1 (en)

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FR0701211A FR2912851B1 (en) 2007-02-20 2007-02-20 IDENTIFICATION DEVICE FOR A MOTOR VEHICLE
PCT/EP2008/052092 WO2008101974A1 (en) 2007-02-20 2008-02-20 Identification device for an automotive vehicle

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