(51) Int Cl.: B60L 11/18 (2006.01)



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(19) (11) EP 1 786 648 B1 (12) EUROPEAN PATENT SPECIFICATION (4) Date of publication and mention of the grant of the patent: 31.03. Bulletin /13 (21) Application number: 086231. (22) Date of filing: 07.09.0 (1) Int Cl.: B60L 11/18 (06.01) (86) International application number: PCT/IB0/002646 (87) International publication number: WO 06/07281 (13.07.06 Gazette 06/28) (4) BATTERY CONTROL SYSTEM FOR HYBRID VEHICLE AND METHOD FOR CONTROLLING A HYBRID VEHICLE BATTERY BATTERIESTEUERSYSTEM FÜR HYBRIDFAHRZEUGE UND VERFAHREN ZUR KONTROLLE EINER HYBRIDFAHRZEUGBATTERIE SYSTEME DE COMMANDE DE BATTERIE POUR VEHICULE HYBRIDE ET PROCEDE DE COMMANDE D UNE BATTERIE DE VEHICULE HYBRIDE (84) Designated Contracting States: DE GB SE () Priority: 08.09.04 US 936370 (43) Date of publication of application: 23.0.07 Bulletin 07/21 (73) Proprietor: Eaton Corporation Cleveland, Ohio 44114 (US) (72) Inventors: HOPE, Mark Edward Marshal, MI 49068 (US) BOCKELMANN, Thomas Robert Battle Creek, MI 49014 (US) ZOU, Zhanjiang LaSalle, Ontario N9H 2M8 (CA) KANG, Xiaosong Battle Creek, MI 49014 (US) (74) Representative: Rüger, Barthelt & Abel Patentanwälte Postfach 04 61 73704 Esslingen a. N. (DE) (6) References cited: EP-A- 1 122 87 EP-A- 1 11 892 DE-A1-127 782 PATENT ABSTRACTS OF JAPAN vol. 1999, no. 04, April 1999 (1999-04-) & JP 11 0089 A (DENSO CORP), 12 January 1999 (1999-01-12) EP 1 786 648 B1 Note: Within nine months of the publication of the mention of the grant of the European patent in the European Patent Bulletin, any person may give notice to the European Patent Office of opposition to that patent, in accordance with the Implementing Regulations. Notice of opposition shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). Printed by Jouve, 7001 PARIS (FR)

1 EP 1 786 648 B1 2 Description BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates generally to hybrid motor vehicles and, more particularly, to a battery control system for controlling the state of charge of a hybrid vehicle battery. Background of the Invention 1 2 3 4 0 [0002] Motor vehicle manufacturers are actively working to develop alternative powertrain systems in an effort to reduce the level of pollutants exhausted into the air by conventional powertrains equipped with internal combustion engines. Significant development efforts have been directed to electric and fuel-cell vehicles. Unfortunately, these alternative powertrain systems suffer from several disadvantages and, for all practical purposes, are still under development. However, "hybrid" vehicles, which are equipped with an internal combustion engine and an electric traction motor that can be operated independently or in combination with the internal combustion engine to provide motive power for the vehicle, offer a compromise between traditional internal combustion engine powered vehicles and full electric powered vehicles. [0003] A hybrid vehicle is typically equipped with a relatively high voltage hybrid powertrain battery, for example a 3 V battery, which provides electrical power to the electric traction motor. Many hybrid vehicles are also equipped with a lower voltage battery, for example a 12 V battery, which provides power to various vehicle accessories, such as the vehicle radio, lights and other electrically operated equipment not powered by the hybrid powertrain battery. The charge level of the vehicle batteries is monitored according to an index known as the battery State of Charge, or SOC. The SOC is defined by a ratio of the amount of residual charge remaining in a battery relative to its full charge capacity. Presently, a battery s SOC may be measured using a combination of a measurement method utilizing a correlation between SOC and a battery s voltage-current characteristics at the time of charging ( or discharging) and a measurement method utilizing an accumulation of charged and discharged amounts. [0004] In many hybrid vehicles, a battery control system controls charging (and discharging) of a battery based on the SOC. For example, EP 1 11 892 discloses a vehicle with a high voltage power source system and a method of controlling the start of such vehicle using a battery control system that sets a minimum reference voltage and an operation inhibiting reference voltage, as criteria for detecting the conditions of power supply of a low voltage power source system including a low voltage battery. In a first range where the power source voltage of the low voltage battery is lower than the minimum reference voltage but is not lower than the operation inhibiting reference voltage, a converter is activated so as to recover the power source voltage of the low voltage battery to the minimum reference voltage. In a second range where the power source voltage of the low voltage battery is lower than the operation inhibiting reference voltage, operation of the whole system is inhibited. DE 127782 A1 discloses a system for controlling a heating device for a particulate filter provided in an exhaust passage of an engine. The system comprises a second battery for supplying the heating device with electric power. The second battery is charged according to the quantity of the collected particulates by using the power output of the engine. A limitation of many hybrid battery control systems is that they fail to manage the lower voltage battery s charge level as it supplies power to the vehicle accessories, particularly when the internal combustion engine is turned off. Failure to manage the lower voltage battery may result in the battery becoming depleted. Accordingly, a need exists for an improved battery control system for a hybrid vehicle that monitors and controls a charged state of the lower voltage vehicle accessory battery to prevent the battery from becoming depleted. To meet this need the invention provides a battery control system and a method for controlling a hybrid vehicle powertrain system according to claims 1 and 16, respectively. SUMMARY OF THE INVENTION [000] The present invention includes a battery control system for controlling a hybrid powertrain system to, among other things, maintain a predetermined level of charge in a vehicle accessory battery. In an embodiment of the invention, the battery control system includes a hybrid powertrain battery, a vehicle accessory battery, and a prime mover driven generator adapted to charge the vehicle accessory battery. The battery control system also includes a detecting arrangement configured to monitor the vehicle accessory battery s state of charge. A controller is configured to activate the prime mover to drive the generator and recharge the vehicle accessory battery in response to the vehicle accessory battery s state of charge falling below a first predetermined level, or transfer electrical power from the hybrid powertrain battery to the vehiele accessory battery in response to the vehicle accessory battery s state of charge falling below a second predetermined level. The invention further includes a method for controlling a hybrid vehicle powertrain system. BRIEF DESCRIPTION OF THE DRAWINGS [0006] Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings, wherein: [0007] FIG. 1 is a block diagram schematically illustrating the overall structure of a hybrid vehicle powertrain 2

3 EP 1 786 648 B1 4 that includes a battery control system according to an embodiment of the present invention; [0008] FIG. 2 is a block diagram schematically illustrating the overall structure of a battery control system according to an embodiment of the present invention; and [0009] FIG. 3 is a block diagram schematically illustrating the overall structure of a battery control system according to another embodiment of the present invention. DETAILED DESCRIPTION [00] FIG. 1 is a block diagram schematically showing the overall structure of a hybrid vehicle powertrain suitable for use with a battery control system according to an embodiment of the present invention. In the illustrated embodiment, hybrid vehicle powertrain system includes a first prime mover 12, such as a diesel or gasoline powered internal combustion engine, and a second prime mover 14, such as an electric traction motor. When second prime mover 14 functions as an electric traction motor, for example, hybrid vehicle powertrain may also include a hybrid powertrain battery 16, such as a 3 V Nickel Metal Hydrogen (NiMH) battery or the like. When first prime mover 12 functions as an internal combustion engine, for example, powertrain system may include an electric starter motor 18 for cranking the engine. In the illustrated embodiment, starter motor 18 is powered by a vehicle accessory battery, such as a 12 V lead acid battery. To maintain an adequate level of charge in battery, hybrid vehicle powertrain may also include a first prime mover driven generator 22, such as an alternator, that is provided in electrical communication with vehicle accessory battery. [0011] Referring to FIG. 2, a battery control system 24 according to an embodiment of the present invention is shown. In the illustrated embodiment, battery control system 24 includes vehicle accessory battery and first prime mover driven generator 22, which is adapted to charge vehicle accessory battery. As shown in FIG. 2, battery control system 24 may also include a detecting arrangement 26 configured to monitor the vehicle accessory battery s State of Charge (SOC). In an embodiment, detecting arrangement 26 includes a battery control unit (BCU) 27, such as an electronic control unit The voltage in battery may be measured by a voltage sensor 28 and a current sensor may be used to measure charged and discharged current with respect to battery. The voltage and current measurements are supplied to BCU 27, which accumulates charged or discharged voltage and current measurements with respect to battery for determination of the battery SOC. [0012] In an embodiment, BCU 27 outputs the determined SOC to a hybrid vehicle control unit (HVCU) 32, such as an electronic control unit. Based on the SOC input from BCU 27, the HVCU 32 is configured to control operation of, among other things, first prime mover 24 to drive generator 22 and produce electrical energy needed 1 2 3 4 0 to recharge battery in response to the vehicle accessory battery s SOC falling below a predetermined level. For example, when the vehicle accessory battery s SOC is too low to support the vehicle accessory load, the HVCU 32 may command the internal combustion engine to start, which operates generator 22 to charge battery and provide power for the vehicle accessory load. After battery has been charged to a predetermined level, the HVCU 32 will turn the internal combustion engine off. [0013] Referring to FIG. 3, a battery control system 124 according to another embodiment of the present invention is shown. Battery control system 124 is substantially similar to battery control system 24 described above with at least one addition, namely, a voltage converter 1 and hybrid powertrain battery 116. As in battery control system 24, BCU 127 functions to monitor the vehicle accessory battery s SOC and outputs the determined SOC to hybrid vehicle control unit (HVCU) 132. Based on the SOC input from BCU 127, the HVCU 132 is configured to control operation of, among other things, voltage converter 1 to transfer electrical power from hybrid powertrain battery 116 to vehicle accessory battery 1 in response to the vehicle accessory battery s state of charge falling below a predetermined level. [0014] Voltage converter 1 converts the voltage level in hybrid powertrain battery 116 to the voltage level in vehicle accessory battery 1. As shown in FIG. 3, for example, voltage converter 1 may be used to step down the voltage in a 3 V hybrid powertrain battery bus to the voltage in a 12 V vehicle accessory battery bus. [001] In a particular operating mode, for example when the vehicle accessory battery s SOC is too low to support the vehicle accessory load, the HVCU 132 will command voltage converter 1 to transfer electrical power from hybrid powertrain battery 116 to charge battery 1 and provide power for the vehicle accessory load. If needed, HVCU 132 may also operate first prime mover 112 to drive the electric traction motor (FIG. 1) as a generator to charge hybrid powertrain battery 116 and provide power to charge battery 1 and/or operate the vehicle accessories via voltage converter 1. After vehicle accessory battery 1 has been charged to a predetermined level, the HVCU 132 will terminate the transfer of power between hybrid powertrain battery 116 and vehicle accessory battery 1 and operation of first prime mover 112 (if needed). [0016] In another mode of operation, when the vehicle accessory battery s SOC is too low to support the vehicle accessory load, the HVCU 132 may command voltage converter 1 to transfer electrical power from hybrid powertrain battery 116 to charge battery 1 and provide power for the vehicle accessory load. Optionally, the HVCU 132 may also command the internal combustion engine to simultaneously operate generator 122 to charge battery 1 and provide power for the vehicle accessory load. Additionally, if needed, HVCU 132 may also operate first 3

EP 1 786 648 B1 6 prime mover 112 to drive the electric traction motor as a generator to charge hybrid powertrain battery 116 and provide power to charge battery 1 and/or operate the vehicle accessories via voltage converter 1. After battery 1 has been charged to a predetermined level, the HVCU 132 will terminate the transfer of power between hybrid powertrain battery 116 and vehicle accessory battery 1 and operation of first prime mover 112 (if needed). [0017] In the modes of operation described above, the predetermined SOC level in battery 1 that activates the recharging process may be the same or different for activation of generator 122 or voltage converter 1. For example, an SOC level below 1% may cause HVCU 132 to operate the generator 122 to recharge battery 1 and an SOC level below % may cause HVCU 132 to operate voltage converter 1 to charge battery 1. Claims 1. A battery control system ()for a hybrid vehicle, comprising: a hybrid powertrain battery (16); a vehicle accessory battery (); a prime mover driven generator (22) adapted to charge the vehicle accessory battery (); a detecting arrangement (26) configured to monitor the vehicle accessory battery s state of charge; and a controller (32) configured to: activate the prime mover (12) to drive the generator (22) and recharge the vehicle accessory battery () in response to the vehicle accessory battery s state of charge falling below a first predetermined level, the controller being further configured to alternatively transfer electrical power from the hybrid powertrain battery (16) to the vehicle accessory battery () in response to the vehicle accessory battery s state of charge falling below a second predetermined level, wherein to activate the prime mover (12) the controller (32) is configured to command the prime mover (12) to start and to drive the generator (22) to charge the vehicle accessory battery(), and wherein the controller is further configured to command the prime mover to turn off once the vehicle accessory battery has been charged to a third predetermined level. 2. The battery control system of claim I, wherein the detecting arrangement (26) includes a battery control unit (27). 3. The battery control system of claim 1, wherein the 1 2 3 4 0 detecting arrangement (26) includes a voltage or current measuring sensor (28;). 4. The battery control system of claim 1, wherein the prime mover driven generator (22) is an alternator.. The battery control system of claim 1, wherein the prime mover driven generator (22) is a hybrid motorgenerator. 6. The battery control system of claim 1, wherein the controller (32) includes a hybrid powertrain system controller. 7. The battery control system of claim 1, wherein the controller (32) includes a voltage converter. 8. The battery control system of claim 1, wherein the controller (32) is configured to simultaneously: operate the prime mover (12) to drive the generator (22) and recharge the vehicle accessory battery () in response to the vehicle accessory battery s state of charge falling below the first predetermined level, and transfer electrical power from the hybrid powertrain battery (16) to the vehicle accessory battery () in response to the vehicle accessory battery s state of charge falling below the second predetermined level. 9. The battery control system of claim 1, wherein the first predetermined level is substantially similar to the second predetermined level.. The battery control system of claim 1, wherein the prime mover is a traction motor. 11. The battery control system of claim 1, wherein the controller includes a voltage converter (1) to convert a higher voltage of the hybrid powertrain battery (116) to a voltage that can be used by the vehicle accessory battery (1). 12. The battery control system of claim 11, wherein the converter (1) steps down the voltage from a 3 V hybrid powertrain battery (146) to a 12 V vehicle accessory battery (1). 13. The battery control system of claim 11 or 12, wherein the state of charge level of the vehicle accessory battery () that activates recharging of the vehicle accessory battery is different for the activation of the prime mover driven generator (22) and the activation of a voltage converter. 14. The battery control system of claim 1, wherein a state of charge level of the vehicle accessory battery () 4

7 EP 1 786 648 B1 8 below 1% causes the operation of the generator (22) to recharge the vehicle accessory battery. 1. The battery control system of claim 14, wherein a state of charge level of the vehicle accessory battery () below % causes the voltage converter to recharge the vehicle accessory battery. 16. A method for controlling a hybrid vehicle powertrain system, comprising the steps of: providing a hybrid powertrain battery (16), a vehicle accessory battery (), and a prime mover driven generator (22) adapted to charge the vehicle accessory battery, monitoring the vehicle accessory battery s state of charge; and activating the prime mover (12) to drive the generator (22) and recharge the vehicle accessory battery () in response to the vehicle accessory battery s state of charge falling below a first predetermined level, or transferring electrical power from the hybrid powertrain battery (16) to the vehicle accessory battery in response to the vehicle accessory battery s state of charge falling below a second predetermined level, wherein the step of activating the prime mover (12) includes commanding the prime mover (12) to start and to drive the generator (22) to charge the vehicle accessory battery (), and wherein the prime mover is further commanded to turn off once the vehicle accessory battery has been charged to a third predetermined level. 17. The method of claim 16, wherein the monitoring step includes monitoring the vehicle accessory battery s state of charge using a battery control unit (27). 18. The method of claim 16, wherein the monitoring step includes monitoring the vehicle accessory battery s state of charge using a voltage or current measuring sensor (28;). 19. The method of claim 16, wherein the prime mover driven generator (22) is an alternator.. The method of claim 16, wherein the prime mover driven generator (22) is a hybrid motor-generator. 21. The method of claim 16, wherein the step of transferring electrical power from the hybrid powertrain battery (16) to the vehicle accessory battery (29) includes converting the voltage provided by the hybrid powertrain battery. 1 2 3 4 0 22. The method of claim 16, wherein the activating and transferring steps are performed virtually simultaneously. 23. The method of claim 16, wherein the first predetermined level is substantially similar to the second predetermined level. Patentansprüche 1. Batteriesteuersystem () für ein Hybridfahrzeug, das aufweist: eine Hybridantriebbatterie (16); eine Fahrzeugzubehörbatterie (); einen von einer Antriebsmaschine angetriebenen Generator (22), der eingerichtet ist, um die Fahrzeugzubehörbatterie () zu laden; eine Erfassungseinrichtung (26), die konfiguriert ist, um den Ladezustand der Fahrzeugzubehörbatterie zu überwachen; und eine Steuerungseinrichtung (32), die konfiguriert ist, um: die Antriebsmaschine (12) zu aktivieren, um als Reaktion darauf, dass der Ladezustand der Fahrzeugzubehörbatterie unter ein erstes vorbestimmtes Niveau fällt, den Generator (22) anzutreiben und die Fahrzeugzubehörbatterie () zu laden, wobei die Steuerungseinrichtung ferner konfiguriert ist, um alternativ elektrische Leistung von der Hybridantriebbatterie (16) zu der Fahrzeugzubehörbatterie () als Reaktion darauf zu übertragen, dass der Ladezustand der Fahrzeugzubehörbatterie unter ein zweites vorbestimmtes Niveau fällt, wobei, um die Antriebsmaschine (12) zu aktivieren, die Steuerungseinrichtung (32) konfiguriert ist, um die Antriebsmaschine (12) anzuweisen, zu starten und den Generator (22) anzutreiben, um die Fahrzeugzubehörbatterie () zu laden, und wobei die Steuerungseinrichtung ferner konfiguriert ist, um die Antriebsmaschine anzuweisen abzuschalten, sobald die Fahrzeugzubehörbatterie auf ein drittes vorbestimmtes Niveau aufgeladen worden ist. 2. Batteriesteuersystem nach Anspruch 1, wobei die Erfassungseinrichtung (26) eine Batteriesteuereinheit (27) enthält. 3. Batteriesteuersystem nach Anspruch 1, wobei die Erfassungseinrichtung (26) einen Spannungs- oder Strommesssensor (28; ) enthält. 4. Batteriesteuersystem nach Anspruch 1, wobei der von der Antriebsmaschine angetriebene Generator (22) eine Lichtmaschine ist.

9 EP 1 786 648 B1. Batteriesteuersystem nach Anspruch 1, wobei der von der Antriebsmaschine angetriebene Generator (22) ein Hybridmotor-Generator ist. 6. Batteriesteuersystem nach Anspruch 1, wobei die Steuerungseinrichtung (32) einen Hybridantriebssystemcontroller enthält. 7. Batteriesteuersystem nach Anspruch 1, wobei die Steuerungseinrichtung (32) einen Spannungswandler enthält. 8. Batteriesteuersystem nach Anspruch 1, wobei die Steuerungseinrichtung (32) konfiguriert ist, um gleichzeitig: die Antriebsmaschine (12) zu betreiben, um den Generator (22) anzutreiben und die Fahrzeugzubehörbatterie () wiederaufzuladen, als Reaktion darauf, dass der Ladezustand der Fahrzeugzubehörbatterie unter das erste vorbestimmte Niveau fällt, und elektrische Leistung von der Hybridantriebbatterie (16) zu der Fahrzeugzubehörbatterie () als Reaktion darauf, dass der Ladezustand der Fahrzeugzubehörbatterie unter das zweite vorbestimmte Niveau fällt, zu übertragen. 9. Batteriesteuersystem nach Anspruch 1, wobei das erste vorbestimmte Niveau im Wesentlichen gleich dem zweiten vorbestimmten Niveau ist.. Batteriesteuersystem nach Anspruch 1, wobei die Antriebsmaschine ein Fahrmotor ist. 11. Batteriesteuersystem nach Anspruch 1, wobei die Steuerungseinrichtung einen Spannungswandler (1) enthält, um eine höhere Spannung der Hybridantriebbatterie (116) in eine Spannung umzuwandeln, die von der Fahrzeugzubehörbatterie (1) genutzt werden kann. 12. Batteriesteuersystem nach Anspruch 11, wobei der Wandler (1) die Spannung von einer 3V Hybridantriebbatterie auf 12V der Fahrzeugzubehörbatterie (1) herunter transformiert. 13. Batteriesteuersystem nach Anspruch 11 oder 12, wobei das Ladezustandsniveau der Fahrzeugzubehörbatterie (), das ein Wiederaufladen der Fahrzeugzubehörbatterie auslöst, sich von dem für die Aktivierung des von der Antriebsmaschine angetriebenen Generators (22) und der Aktivierung eines Spannungswandlers unterscheidet. 14. Batteriesteuersystem nach Anspruch 1, wobei ein Ladezustandsniveau der Fahrzeugzubehörbatterie () unterhalb von 1% den Betrieb des Generators 1 2 3 4 0 (22) veranlasst, um die Fahrzeugzubehörbatterie wiederaufzuladen. 1. Batteriesteuersystem nach Anspruch 14, wobei ein Ladezustandsniveau der Fahrzeugzubehörbatterie () unterhalb von % den Spannungswandler veranlasst, die Fahrzeugzubehörbatterie wiederaufzuladen. 16. Verfahren zur Steuerung eines Hybridfahrzeugantriebssystems, das die Schritte aufweist: Bereitstellen einer Hybridantriebbatterie (16), einer Fahrzeugzubehörbatterie () und eines von einer Antriebsmaschine angetriebenen Generators (22), der eingerichtet ist, um die Fahrzeugzubehörbatterie zu laden, Überwachen des Ladezustands der Fahrzeugzubehörbatterie; und Aktivieren der Antriebsmaschine (12), um den Generator (22) anzutreiben und die Fahrzeugzubehörbatterie () wiederaufzuladen, als Reaktion darauf, dass der Ladezustand der Fahrzeugzubehörbatterie unter ein erstes vorbestimmtes Niveau fällt, oder Übertragen elektrischer Leistung von der Hybridantriebbatterie (16) zu der Fahrzeugzubehörbatterie als Reaktion darauf, dass der Ladezustand der Fahrzeugzubehörbatterie unter ein zweites vorbestimmtes Niveau fällt, wobei der Schritt der Aktivierung der Antriebsmaschine (12) eine Anweisung an die Antriebsmaschine (12) enthält, zu starten und den Generator (22) anzutreiben, um die Fahrzeugzubehörbatterie () zu laden, und wobei die Antriebsmaschine ferner angewiesen wird abzuschalten, sobald die Fahrzeugzubehörbatterie auf ein drittes vorbestimmtes Niveau aufgeladen worden ist. 17. Verfahren nach Anspruch 16, wobei der Überwachungsschritt ein Überwachen des Ladezustands der Fahrzeugzubehörbatterie unter Verwendung einer Batteriesteuereinheit (27) enthält. 18. Verfahren nach Anspruch 16, wobei der Überwachungsschritt ein Überwachen des Ladezustands der Fahrzeugzubehörbatterie unter Verwendung eines Spannungs- oder Strommesssensors (28; ) enthält. 19. Verfahren nach Anspruch 16, wobei der von der Antriebsmaschine angetriebene Generator (22) eine Lichtmaschine ist.. Verfahren nach Anspruch 16, wobei der von der Antriebsmaschine angetriebene Generator (22) ein Hybridmotor-Generator ist. 6

11 EP 1 786 648 B1 12 21. Verfahren nach Anspruch 16, wobei der Schritt der Übertragung elektrischer Leistung von der Hybridantriebbatterie (16) zu der Fahrzeugzubehörbatterie (29) ein Umwandeln der von der Hybridantriebbatterie gelieferten Spannung enthält. 22. Verfahren nach Anspruch 16, wobei der Aktivierungs- und der Übertragungsschritt praktisch zeitgleich durchgeführt werden. 23. Verfahren nach Anspruch 16, wobei das erste vorbestimmte Niveau im Wesentlichen gleich dem zweiten vorbestimmten Niveau ist. Revendications 1. Système () de commande de batterie pour un véhicule hybride, comprenant: une batterie (16) de transmission hybride; une batterie () pour accessoires du véhicule; un générateur (22) entraîné par un moteur principal adapté pour charger la batterie () pour accessoires du véhicule; un agencement (26) de détection configuré pour surveiller l état de charge de la batterie pour accessoires du véhicule; et une unité de commande (32) configurée pour: activer le moteur principal (12) afin d entraîner le générateur (22) et recharger la batterie () pour accessoires du véhicule en réponse au fait que l état de charge de la batterie pour accessoires du véhicule descend sous un premier niveau prédéterminé, l unité de commande étant configurée en plus pour transférer une puissance électrique de manière alternative à partir de la batterie (16) de transmission hybride vers la batterie () pour accessoires du véhicule en réponse au fait que l état de charge de la batterie pour accessoires du véhicule descend sous un deuxième niveau prédéterminé, où pour activer le moteur principal (12) l unité de commande (32) est configurée pour commander le moteur principal (12) afin de démarrer et d entraîner le générateur (22) pour charger la batterie () pour accessoires du véhicule, et où l unité de commande est configurée en plus pour commander le moteur principal afin de le mettre à l arrêt une fois que la batterie pour accessoires du véhicule est chargée à un troisième niveau prédéterminé. 2. Système de commande de batterie de la revendication 1, dans lequel l agencement (26) de détection 1 2 3 4 0 comporte une unité (27) de commande de batterie. 3. Système de commande de batterie de la revendication 1, dans lequel l agencement (26) de détection comporte un capteur (28; ) de mesure de tension électrique ou de courant électrique. 4. Système de commande de batterie de la revendication 1, dans lequel le générateur (22) entraîné par un moteur principal est un alternateur.. Système de commande de batterie de la revendication 1, dans lequel le générateur (22) entraîné par un moteur principal est un moteur-générateur hybride. 6. Système de commande de batterie de la revendication 1, dans lequel l unité de commande (32) comporte une unité de commande de système de transmission hybride. 7. Système de commande de batterie de la revendication 1, dans lequel l unité de commande (32) comporte un convertisseur de tension électrique. 8. Système de commande de batterie de la revendication 1, dans lequel l unité de commande (32) est configurée pour, simultanément: actionner le moteur principal (12) pour entraîner le générateur (22) et recharger la batterie () pour accessoires du véhicule en réponse au fait que l état de charge de la batterie pour accessoires du véhicule descend sous un premier niveau prédéterminé, et transférer une puissance électrique à partir de la batterie (16) de transmission hybride vers la batterie () pour accessoires du véhicule en réponse au fait que l état de charge de la batterie pour accessoires du véhicule descend sous un deuxième niveau prédéterminé, 9. Système de commande de batterie de la revendication 1, dans lequel le premier niveau prédéterminé est essentiellement similaire au deuxième niveau prédéterminé. Système de commande de batterie de la revendication 1, dans lequel le moteur principal est un moteur de traction. 11. Système de commande de batterie de la revendication 1, dans lequel l unité de commande comporte un convertisseur (1) de tension électrique pour convertir une tension électrique supérieure de la batterie (116) de transmission hybride en une tension électrique qui peut être utilisée par la batterie () pour accessoires du véhicule. 7

13 EP 1 786 648 B1 14 12. Système de commande de batterie de la revendication 11, dans lequel le convertisseur (1) abaisse la tension électrique d une batterie (146) de transmission hybride de 3 V à une batterie (1) pour accessoires du véhicule de 12 V. 13. Système de commande de batterie de la revendication 11 ou 12, dans lequel l état de niveau de charge de la batterie () pour accessoires du véhicule qui active le rechargement de la batterie pour accessoires du véhicule est différent pour l activation du générateur (22) entraîné par un moteur principal et l activation d un convertisseur de tension électrique. la batterie pour accessoires du véhicule a été chargée à un troisième niveau prédéterminé. 17. Procédé de la revendication 16, dans lequel l étape de surveillance comporte le fait de surveiller l état de charge de la batterie pour accessoires du véhicule en utilisant une unité de commande (27) de batterie. 18. Procédé de la revendication 16, dans lequel l étape de surveillance comporte le fait de surveiller l état de charge de la batterie pour accessoires du véhicule en utilisant un capteur (28; ) de mesure de tension électrique ou de courant électrique. 14. Système de commande de batterie de la revendication 1, dans lequel un état de niveau de charge de la batterie () pour accessoires du véhicule en-dessous de 1% provoque le fonctionnement du générateur (22) pour recharger la batterie pour accessoires du véhicule. 1. Système de commande de batterie de la revendication 14, dans lequel un état de niveau de charge de la batterie () pour accessoires du véhicule en-dessous de % amène le convertisseur de tension électrique à recharger la batterie pour accessoires du véhicule. 16. Procédé pour commander un système de transmission de véhicule hybride, comprenant les étapes consistant à: fournir une batterie (16) de transmission hybride, une batterie () pour accessoires du véhicule, et un générateur (22) entraîné par un moteur principal adapté pour charger la batterie () pour accessoires du véhicule, surveiller l état de charge de la batterie pour accessoires du véhicule; et activer le moteur principal (12) afin d entraîner le générateur (22) et recharger la batterie () pour accessoires du véhicule en réponse au fait que l état de charge de la batterie pour accessoires du véhicule descend sous un premier niveau prédéterminé, ou transférer une puissance électrique à partir de la batterie (16) de transmission hybride vers la batterie () pour accessoires du véhicule en réponse au fait que l état de charge de la batterie pour accessoires du véhicule descend sous un deuxième niveau prédéterminé, 1 2 3 4 0 19. Procédé de la revendication 16, dans lequel le générateur (22) entraîné par un moteur principal est un alternateur.. Procédé de la revendication 16, dans lequel le générateur (22) entraîné par un moteur principal est un moteur-générateur hybride. 21. Procédé de la revendication 16, dans lequel l étape consistant à transférer une puissance électrique à partir de la batterie (16) de transmission hybride vers la batterie (29) pour accessoires du véhicule comporte le fait de convertir la tension électrique pourvue par la batterie de transmission hybride. 22. Procédé de la revendication 16, dans lequel les étapes d activation et de transfert sont effectuées virtuellement de manière simultanée. 23. Procédé de la revendication 16, dans lequel le premier niveau prédéterminé est essentiellement similaire au deuxième niveau prédéterminé. où l étape consistant à activer le moteur principal (12) comporte le fait de commander le moteur principal (12) afin de démarrer et d entraîner le générateur (22) pour charger la batterie () pour accessoires du véhicule, et où le moteur principal est commandé en plus afin de le mettre à l arrêt une fois que 8

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EP 1 786 648 B1 REFERENCES CITED IN THE DESCRIPTION This list of references cited by the applicant is for the reader s convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard. Patent documents cited in the description EP 111892 A [0004] DE 127782 A1 [0004] 11