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.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Business, Economics & Management (AREA)
• Emergency Management (AREA)
• Power Engineering (AREA)
• Lock And Its Accessories (AREA)
• Charge And Discharge Circuits For Batteries Or The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38024256

Family Applications (1)

Country Status (3)

Families Citing this family (4)

Citations (2)

Family Cites Families (8)

• 2007
  • 2007-02-20 FR FR0701211A patent/FR2912851B1/fr not_active Expired - Fee Related
• 2008
  • 2008-02-20 EP EP08716995A patent/EP2132060A1/de not_active Withdrawn
  • 2008-02-20 WO PCT/EP2008/052092 patent/WO2008101974A1/fr active Application Filing

Patent Citations (2)

Non-Patent Citations (1)

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