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WO1997030255A1 - Systeme de verrouillage pour vehicule - Google Patents

Systeme de verrouillage pour vehicule Download PDF

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Publication number
WO1997030255A1
WO1997030255A1 PCT/JP1997/000265 JP9700265W WO9730255A1 WO 1997030255 A1 WO1997030255 A1 WO 1997030255A1 JP 9700265 W JP9700265 W JP 9700265W WO 9730255 A1 WO9730255 A1 WO 9730255A1
Authority
WO
WIPO (PCT)
Prior art keywords
key
coil
antenna coil
lof
locking system
Prior art date
Application number
PCT/JP1997/000265
Other languages
English (en)
Inventor
Keiji Yamamoto
Kouji Koga
Original Assignee
Toyota Jidosha Kabushiki Kaisha
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 Toyota Jidosha Kabushiki Kaisha filed Critical Toyota Jidosha Kabushiki Kaisha
Priority to EP97901827A priority Critical patent/EP0823012A1/fr
Publication of WO1997030255A1 publication Critical patent/WO1997030255A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B81/00—Power-actuated vehicle locks
    • E05B81/02—Power-actuated vehicle locks characterised by the type of actuators used
    • E05B81/04—Electrical
    • E05B81/08—Electrical using electromagnets or solenoids
    • 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
    • B60R25/01—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens
    • B60R25/04—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens operating on the propulsion system, e.g. engine or drive motor
    • 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
    • B60R25/2063—Ignition switch geometry
    • 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
    • B60R25/24—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
    • G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means
    • G07C2009/00777—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means by induction

Definitions

  • the present invention generally relates to a locking system for a vehicle and, more particularly, to an electric locking system suitable for an anti-theft system for a vehicle.
  • Japanese Laid-Open Patent Utility Model Application No.6-40247 discloses a locking system for a vehicle which comprises a coil provided in a key and an antenna coil provided in a key cylinder into which the key is inserted.
  • an identification (ID) signal is transmitted from the key to the key cylinder so as to check whether the ID signal transmitted from the key matches a registered ID signal.
  • Operation of the vehicle is permitted when it is determined that the ID signal transmitted from the key matches the registered ID signal.
  • the vehicle can be locked electrically in addition to a mechanical lock system. This ensures locking of the vehicle.
  • the antenna coil is arranged in the key cylinder so that the center axis of the antenna coil aligns with the center of the coil of the key when the key is inserted into the key cylinder. According to this arrangement, a strong electromagnetic coupling between the coil of the key and the antenna coil of the key cylinder is provided. Thus, a change in the magnetic flux density generated by the coil of the key is efficiently transmitted to the antenna coil of the key cylinder.
  • the conventional locking system there is a gap formed between the coil of the key and the antenna coil of the key cylinder.
  • the gap between the coil and the antenna coil should be as small as possible.
  • the above-mentioned conventional locking system has a problem in that a width of the gap between the coil and antenna coil cannot be decreased beyond a limit due to the arrangement of the coil of the key and the antenna coil of the key cylinder.
  • a more specific object of the present invention is to provide a locking system for a vehicle having a high electromagnetic conversion efficiency between a coil of a key and an antenna coil of a key cylinder by reducing a width of a gap formed between the coil and the antenna coil when the key is inserted into the key cylinder.
  • a locking system for a vehicle comprising a key system having a key cylinder and a key inserted into the key cylinder, the key cylinder including an antenna coil and the key including a coil, the coil transmitting data to the antenna coil by an electromagnetic conversion method so that a locking operation of the vehicle is controlled by an electrical control unit based on the data transmitted from the key, characterized in that: one of the antenna coil and the coil is located inside the other one of the antenna coil and the coil when the key is inserted into the key cylinder.
  • one of the antenna coil provided in the key cylinder and the coil provided in the key is located inside the other one of the antenna coil and the coil, magnetic flux generated by one of the antenna coil and the coil effectively passes through the other one of the antenna coil and the coil.
  • a high electromagnetic conversion efficiency is provided between the antenna coil of the key cylinder and the coil of the key. This ensures reliable communication between the antenna coil of the key cylinder and the coil of the key.
  • the antenna coil is provided inside a protrusion formed on a surface of the key cylinder and the coil is provided inside an annular portion of the key so that the protrusion protrudes into a center opening of the annular portion when the key is inserted into the key cylinder.
  • the key cylinder has an opening which receives a portion of the key, the coil provided inside the portion of the key, the antenna coil surrounding the opening.
  • the one of the antenna coil and the coil may have a magnetic material core inside thereof.
  • the one of the antenna coil and the coil may be surrounded by a magnetic material, the magnetic material being located inside the other one of the antenna coil and the coil when the key is inserted into the key cylinder.
  • the data transmitted from the coil to the antenna coil may include a code signal
  • the electrical control unit permits an unlocking operation of the vehicle when the code signal matches a code signal registered in the vehicle.
  • the key cylinder may include at least one key slot, and the key may include at least one key blade adapted to be inserted into the key slot, and the key may include at least one handle to rotate the key.
  • FIG.l is an illustration of the entire structure of a locking system for a vehicle according to a first embodiment of the present invention.
  • FIG.2 is a perspective view of a key shown in FIG.l to show an interior of the key
  • FIG.3 is a perspective view of an interior of an antenna coil portion shown in FIG.l;
  • FIG.4 is a block diagram of an electric circuit provided in the locking system shown in FIG.l;
  • FIG.5 is a block diagram of an electric circuit comprising a coil and an IC circuit incorporated in a key shown in FIG.l;
  • FIG.6 is a waveform chart of a drive signal supplied to a switch circuit shown in FIG.5;
  • FIG.7 is an illustration of the entire structure of a locking system for a vehicle according to a second embodiment of the present invention.
  • FIG.l is an illustration of the entire structure of the locking system for a vehicle according to the first embodiment of the present invention.
  • the locking system according to the first embodiment comprises a key 10, a key cylinder 12, an amplifier 14, an electronic control unit (ECU) 16 and an engine control computer (EFI computer) 18.
  • the key 10 may be an ignition key to start the vehicle.
  • the key cylinder 12 is provided on the vehicle.
  • an ID code is transmitted between the key 10 and the key cylinder 12 so that the vehicle is permitted to be operated only when a correct ID code is transmitted from the key 10 to the key cylinder 12.
  • the key 10 comprises an annular portion 10a, key blades 10b and 10c and handle portions lOd and lOe.
  • the key blades 10b and 10c protrude from one side of the annular portion 10a.
  • the handle portions lOd and lOe protrude from the other side of the annular portion 10a.
  • the antenna coil portion 20 is positioned in a center between the insertion slots 20a and 20b so that the antenna coil portion 20 protrudes through the center opening of the annular portion 10a of the key 10 when the key blades 10b and 10c are inserted into the insertion slots 12a and 12b, respectively.
  • FIG.3 is a perspective view of an interior of the antenna coil portion 20. As shown in FIG.3, an antenna coil 20a having n turns is provided inside the antenna coil portion 20. The antenna coil 20a is wound on a ferrite core 20b. The antenna coil is electrically connected to the amplifier 14.
  • FIG.4 is a block diagram of an electric circuit provided in the locking system according to the first embodiment of the present invention.
  • the electric circuit shown in FIG. comprises the antenna coil 20a, the amplifier 14, the ECU 16 and the EFI computer 18.
  • the ECU 16 has a power source terminal (+B terminal) and a ground terminal (GND terminal) .
  • the power source terminal is connected to a positive pole terminal of a battery for the vehicle, and the ground terminal is connected to a negative pole terminal of the battery.
  • the ECU 16 has a +B terminal and a power source circuit 28 which is connected to the GND terminal of the battery.
  • the power source circuit 28 generates a voltage of 5 volts from a voltage provided from the battery at the +B terminal.
  • the voltage of 5 volts generated by the power source circuit 28 is supplied to a 5-volt terminal 30 of the ECU 16.
  • the ECU 16 has a resistor 32 one end of which is connected to the +B terminal thereof. The other end of the resistor 32 is connected to a current supply terminal 34 of the ECU 16 and the microcomputer 36.
  • the microcomputer 36 is connected to an EEPROM 38 which is a non-volatile memory incorporated in the ECU 16.
  • the microcomputer 36 is also connected to the EFI 18.
  • the EEPROM 38 stores a 64-bit ID code previously set for the vehicle.
  • the microcomputer 36 encodes a change in the voltage appearing on the current supply terminal 34, as described later.
  • the microcomputer 36 determines whether or not the encoded data matches an ID code stored in the EEPROM 38. If it is determined that the encoded ID code matches the stored ID code, the microcomputer 36 generates an instruction to enable the vehicle to be in an operative condition. That is, an ignition operation and a fuel injection operation are enabled. On the other hand, if the encoded ID code does not match the stored ID code, The microcomputer 36 does not generate the instruction to enable the vehicle to be in an operative state. Accordingly, in the system according to the present embodiment, an operation of the vehicle is enabled only when a change in the voltage appearing on the current supply terminal 34 matches the predetermined ID code.
  • the ECU 16 is provided with reference potential terminals 40 and 42 in addition to the above-mentioned current supply circuit 34 and 5-volt terminal 30.
  • the reference potential terminals 40 and 42 are connected to the GND terminal 26.
  • the 5-volt terminal 30, the current supply terminal 34 and the reference potential terminals 40 and 42 of the ECU 16 are connected to a 5-volt terminal 50, a current supply terminal 52 and reference potential terminals 54 and 56 of the amplifier 14, respectively, via connectors 44 and 46 and a wire harness 48 provided therebetween.
  • the amplifier 14 has a drive circuit 58 connected to the 5-volt terminal 50 and the reference potential terminal 58.
  • the drive circuit has two output terminals 58a and 58b.
  • the drive circuit outputs a voltage signal between the terminals 58a and 58b.
  • the voltage signal has a predetermined amplitude with a predetermined frequency. In the present embodiment, when a 5 volts voltage difference is generated between the 5- volt terminal 50 and the reference potential terminal 56, a voltage signal having an amplitude of 5 volts with a frequency of 125 kHz is output between the output terminals 58a and 58b.
  • the antenna coil 20a and the capacitor 66 are connected in parallel to the drive circuit 58 so that the antenna coil 20 and the capacitor 66 together constitute an LC resonance circuit.
  • the frequency of the voltage signal output by the drive circuit 58 is set to match the resonance frequency of the LC resonance circuit. Accordingly, when an operation of the drive circuit 58 is started, an LC oscillation is generated by the antenna coil 20a and the capacitor 66. In the present embodiment, a voltage difference of about
  • 150 volts is generated between the output terminals 62 and 64 of the amplifier 14.
  • the output terminal of the amplifier 14 is connected to a demodulation circuit 68.
  • the demodulation circuit 68 is connected to the reference potential terminal 56 of the amplifier 14.
  • the demodulation circuit 68 detects an amplitude of the voltage signal at the output terminal 64 so as to generate a high-level output when the detected amplitude is greater than a predetermined level and to generate a low level output when the detected amplitude is less than the predetermined level.
  • the demodulation circuit 68 outputs the high-level output when the voltage signal having an amplitude of about 150 volts is detected at the output terminal 64 of the amplifier 14.
  • the demodulation circuit 68 outputs the low- level output when the voltage signal detected at the output terminal 64 has an amplitude less than 150 volts, such as a voltage 20-30 mV lower than 150 volts.
  • the voltage signal output from the demodulation circuit 68 is supplied to a base terminal of a switching element 70.
  • the switching element 70 comprises an NPN transistor.
  • a collector terminal of the switching element 70 is connected to the current supply terminal 52 of the amplifier 14.
  • An emitter terminal of the switching element 70 is connected to the reference potential terminal 54 of the amplifier 14.
  • the switching element 70 is turned to a conductive state when the voltage signal provided to the base terminal thereof is the high-level output.
  • FIG.5 is a block diagram of the electric circuit comprising the coil lOf and the IC circuit lOg.
  • the IC circuit lOg comprises a capacitor 74, a power source circuit 76, a switch circuit 78 and two load circuits 80 and 82.
  • the power source circuit 76 comprises a circuit which generates a direct current voltage by rectifying the voltage change generated between the opposite ends of the coil lOf.
  • the direct current voltage generated by the power source circuit 76 is supplied to a control circuit 84.
  • a memory 86 is connected to the control circuit.
  • the memory 86 stores an ID code which is the same as the ID code stored in the EEPROM 38 shown in FIG.4.
  • the control circuit 84 supplies a switch signal to the switch circuit 78 in accordance with the ID code stored in the memory 86 when power is supplied from the power source circuit 76.
  • the load circuits 80 and 82 are provided with different loads ZI and Z2, respectively. hen the control circuit 84 supplies to the switch circuit 78 the drive signal designating the load circuit 80 to be connected, the load ZI is connected to the LC circuit comprising the coil lOf and the capacitor 74. Hereinafter, this state is referred to as a first state. On the other hand, when the control circuit 84 supplies to the switch circuit 78 the drive signal designating the load circuit 82 to be connected, the load Z2 is connected to the LC circuit comprising the coil lOf and the capacitor 74. Hereinafter, this state is referred to as a second state.
  • the inductance L of the coil 10f, the capacitance C of the capacitor 74 and the values of the load ZI and Z2 are determined so that the resonance frequency of the circuit comprising the coil 10f, the capacitor 74 and the load circuit 80 matches the frequency of the voltage signal generated by the antenna coil 20 when the load ZI is connected to the LC circuit, and also the resonance frequency of the circuit comprising the coil lOf, the capacitor 74 and the load circuit 82 differs, by a predetermined frequency difference, from the frequency of the voltage signal generated by the antenna coil 20 when the load Z2 is connected to the LC circuit.
  • FIG.6 is a waveform chart of the drive signal supplied to the switch circuit 78.
  • the drive signal is generated by the control circuit 84 by encoding the ID signal stored in the memory 86.
  • the ID signal comprises 64 bits.
  • communication of the ID signal is performed using CDP pulses.
  • control circuit 84 supplies the drive signal to the switch circuit 78 so that the bits of the ID signal stored in the memory 86 are arranged in series. At this time, the control circuit 84 controls the drive signal so that when the bit of the ID signal is "0", one of the first state and the second state is switched to the other state during a predetermined time period. Additionally, the control circuit 84 controls the drive signal so that when the bit of the ID signal is "l", one of the first state and the second state is maintained for the predetermined time period.
  • the control circuit 84 Prior to the supply of the drive signal corresponding to the ID signal, the control circuit 84 supplies the drive signal corresponding to a start signal to the switch circuit 78. Additionally, the control circuit 84 supplies the drive signal corresponding to a stop signal to the switch circuit 78 immediately after the completion of the supply of the ID signal. Accordingly, the following variation of the voltage amplitude appears between the opposite ends of the coil lOf, in that order, after the IC circuit is activated: 1) variation of voltage amplitude corresponding to the start signal; 2) variation of voltage amplitude corresponding to the ID signal; and 3) variation of voltage amplitude corresponding to the stop signal.
  • the key blades 10b and 10c of the key 10 are inserted into the key slots 12a and 12b of the key cylinder 12, respectively.
  • the IC circuit lOg incorporated in the key 10 is activated due to an electromagnetic wave transmitted by the antenna coil 20a.
  • the voltage signal having a voltage amplitude which varies in response to the start signal, the ID signal and the stop signal, is generated between the opposite ends of the coil lOf.
  • a mutual inductance M is generated between the antenna coil 20a of the key cylinder 12 and the coil lOf of the key 10.
  • the inductance characteristic of the antenna coil 20a is influenced by a state of the coil lOf.
  • the coil lOf of the key 10 When an electromagnetic signal is generated by the antenna coil 20a, the coil lOf of the key 10 generates a voltage signal between the opposite ends thereof.
  • the demodulation circuit 68 supplies to the switching element 70 the high-level output when the voltage amplitude is large and the low-level output when the voltage amplitude is small.
  • the switching element 70 is set to the non- conductive state when the low-level output is supplied to the base terminal thereof.
  • the switching element 70 When the switching element 70 is set to the non-conductive state, no current flows to the resistor 32 provided in the ECU 16 (refer to FIG.4). Accordingly, in this state, the power source voltage is provided to the current supply terminal 34 of the ECU 16.
  • the switching element 70 when the high-level output is provided to the base terminal of the switching element 70, the switching element 70 is set to the conductive state, and thus a current flows to the resistor 32. In this case, a voltage drop is generated when the current passes through the resistor 32, and almost the ground level voltage appears at the current supply terminal 34.
  • one of the power source voltage and the ground level voltage appears at the current supply terminal 34 of the ECU 16 in respon ⁇ e to the voltage signal supplied to the switching element 70 depending on whether it is in the high-level or the low- level, that is, whether the voltage amplitude at the output terminal 64 is large or small.
  • the microcomputer 36 which is connected to the current supply terminal 34, determines the magnitude of the amplitude of the voltage signal at the output terminal 64 based on the variation in the voltage at the current supply terminal 34.
  • the microcomputer 36 determines that the bit value of the signal transmitted from the key 10 is equal to "1" when it is determined that the large amplitude voltage signal is generated for a predetermined time period or when it is determined that the small amplitude voltage signal is generated for the predetermined time period.
  • the microcomputer 36 determines that the bit value transmitted from the key 10 is equal to "0" when the amplitude of the voltage signal is varied during the predetermined time period.
  • the microcomputer 36 determines the bit value of each bit transmitted from the key 10 so as to detect the ID signal comprising 64 bits after a series of bit signals representing the start signal is detected. Then, the microcomputer 36 determines whether or not the detected ID signal matches the ID signal stored in the EEPROM 38. The microcomputer 36 permits the EFI computer 18 to enable operation of the vehicle only when the detected ID code matches the stored ID code. As mentioned above, the microcomputer 36 decodes the ID signal transmitted from the key 10 based on the variation in the amplitude of the voltage signal generated between the opposite ends of the antenna coil 20a.
  • the variation in the voltage amplitude generated between the opposite ends of the antenna coil 20 is increased as the electromagnetic conversion efficiency between the antenna coil 20a and the coil lOf is increased.
  • the electromagnetic conversion efficiency is increased as the distance between the antenna coil 20a and the coil lOf is decreased. Accordingly, in order to facilitate the decoding of the ID code, it is effective to locate the antenna coil 20a and the coil lOf as close as possible to increase the electromagnetic conversion efficiency between the antenna coil 20a and the coil lOf.
  • the ferrite core 20b is provided inside the antenna coil 20a. That is, the antenna coil 20a is wound on the ferrite core 20b.
  • the magnetic flux generated by the antenna coil 20a is concentrated in the ferrite core 20b.
  • the magnetic flux generated by the antenna coil 20a hardly leaks outside the coil lOf when the key 10 is inserted into the key cylinder 12. That is, the magnetic flux generated by the antenna coil 20a efficiently passes through the coil lOf.
  • the magnetic flux generated by the coil lOf is concentrated in the ferrite core 20b when the key 10 is inserted into the cylinder 12.
  • the magnetic flux generated by the coil lOf is concentrated in the ferrite core 2Ob, the magnetic flux generated by the coil lOf hardly leaks outside the antenna coil 20a when the key 10 is inserted into the key cylinder 12. That is, the magnetic flux generated by the coil lOf efficiently passes through the antenna coil 20a.
  • the electromagnetic conversion efficiency is increased between the antenna coil 20a and the coil lOf when the antenna coil 20a works as an elementary coil and the coil lOf works as a secondary coil and when the coil lOf works as an elementary coil and the antenna coil 20a works as a secondary coil. Accordingly, in the locking system according to the present embodiment, an efficient communication capability is provided between the antenna coil 20a and the coil lOf by the arrangement of the coil lOf and the antenna coil 20a and the ferrite core 20b inside the antenna coil 20a.
  • the magnetic material (ferrite core 20) is provided inside the antenna coil 20a
  • the position of the magnetic material is not limited to the inside of the antenna coil 20a. That is, an annular magnetic material which surrounds the antenna coil 20a may be provided inside the coil lOf or outside the antenna coil. This arrangement provides the same effect as the effect obtained by providing the magnetic material inside the antenna coil 20a.
  • both the antenna coil 20a and the coil lOf may be annular coils without cores therein.
  • FIG.7 is an illustration of the entire structure of a locking system for a vehicle according to the second embodiment of the present invention.
  • parts that are the same as the parts shown in FIG.l are given the same reference numerals, and descriptions thereof will be omitted.
  • a slot 94a into which the key blade 90b is inserted.
  • an efficient communication capability is provided between the antenna coil 96 and the coil 92a by the arrangement of the coil 92a and the antenna coil 96 and the ferrite core 92b inside the coil 92a.
  • the magnetic material (ferrite core 92b) is provided inside the coil 92
  • the position of the magnetic material is not limited to the inside of the coil 92. That is, an annular magnetic material which surrounds the coil 92 may be
  • both the antenna coil 96 and the coil 92b may be annular coils without cores therein.
  • the present invention is not limited to the specifically disclosed embodiments, and variations and modifications may be made without departing from the scope of the present invention.
  • one of the antenna coil provided in the key cylinder and the coil provided in the key is located inside the other one of the antenna coil and the coil, magnetic flux generated by one of the antenna coil and the coil effectively passes through the other one of the antenna coil and the coil.
  • a high electromagnetic conversion efficiency is provided between the antenna coil of the key cylinder and the coil of the key. This ensures reliable communication between the antenna coil of the key cylinder and the coil of the key.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Lock And Its Accessories (AREA)

Abstract

L'invention a trait à un système de verrouillage pour véhicule, du type comportant une clef (10; 90) pourvue d'une bobine (10f; 92a) et un cylindre (12; 94) pourvu d'un bobinage d'antenne (20a; 96). La bobine (10f; 92a) envoie des données au bobinage d'antenne (20a; 96) par conversion électromagnétique de telle sorte que le verrouillage du véhicule est commandé par une unité électrique de commande (14, 16, 18) en fonction des données transmises par la clef (10; 90). Soit le bobinage d'antenne (20a; 96), soit la bobine (10f; 92a), se loge dans l'autre élément, qu'il s'agisse du bobinage ou de la bobine, lorsque la clef (10; 90) est insérée dans le cylindre (12, 94). Une conversion électromagnétique à haut rendement s'effectue ainsi entre le bobinage d'antenne (20a; 96) du cylindre (12, 94) et la bobine (10f; 92a) de la clef (10; 90).
PCT/JP1997/000265 1996-02-15 1997-02-04 Systeme de verrouillage pour vehicule WO1997030255A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97901827A EP0823012A1 (fr) 1996-02-15 1997-02-04 Systeme de verrouillage pour vehicule

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8/28077 1996-02-15
JP2807796A JPH09221948A (ja) 1996-02-15 1996-02-15 車両用ロック装置

Publications (1)

Publication Number Publication Date
WO1997030255A1 true WO1997030255A1 (fr) 1997-08-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1997/000265 WO1997030255A1 (fr) 1996-02-15 1997-02-04 Systeme de verrouillage pour vehicule

Country Status (4)

Country Link
EP (1) EP0823012A1 (fr)
JP (1) JPH09221948A (fr)
KR (1) KR19980703882A (fr)
WO (1) WO1997030255A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2782402A1 (fr) * 1998-08-13 2000-02-18 France Telecom Dispositif de controle d'acces entre une clef et une serrure electroniques
EP1468157B1 (fr) * 2002-01-09 2008-03-05 ISEO SERRATURE S.p.A. Serrure et clè avec dispositif de transmission de donnees et energie electrique entre la clè et la serrure
US9710981B2 (en) 2012-12-05 2017-07-18 Knox Associates, Inc. Capacitive data transfer in an electronic lock and key assembly
USD881677S1 (en) 2017-04-27 2020-04-21 Knox Associates, Inc. Electronic key

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EP0115747A1 (fr) * 1983-01-11 1984-08-15 SAET S.p.A. Anti-vol électronique avec une clé électronique
GB2174452A (en) * 1985-05-03 1986-11-05 Ymos Ag A locking device operating by mechanical and electrical means
GB2273128A (en) * 1991-01-08 1994-06-08 Chubb Lips Nederland Bv Keys
DE4434587A1 (de) * 1993-10-01 1995-04-06 Marquardt Gmbh Elektronisches Zündstartschloßsystem an einem Kraftfahrzeug
DE4341333A1 (de) * 1993-12-03 1995-06-14 Alltronik Gmbh Verfahren zum Betreiben einer elektronischen Wegfahrsperre und elektronische Wegfahrsperre für Kraftfahrzeuge
EP0688928A1 (fr) * 1994-06-24 1995-12-27 TEMIC TELEFUNKEN microelectronic GmbH Module de clé pour système de fermeture
EP0695676A2 (fr) * 1994-06-06 1996-02-07 Delco Electronics Corporation Système de sécurité pour véhicule

Patent Citations (7)

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Publication number Priority date Publication date Assignee Title
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GB2174452A (en) * 1985-05-03 1986-11-05 Ymos Ag A locking device operating by mechanical and electrical means
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2782402A1 (fr) * 1998-08-13 2000-02-18 France Telecom Dispositif de controle d'acces entre une clef et une serrure electroniques
WO2000009836A1 (fr) * 1998-08-13 2000-02-24 La Poste Dispositif de controle d'acces entre une clef et une serrure electroniques
EP1468157B1 (fr) * 2002-01-09 2008-03-05 ISEO SERRATURE S.p.A. Serrure et clè avec dispositif de transmission de donnees et energie electrique entre la clè et la serrure
US9710981B2 (en) 2012-12-05 2017-07-18 Knox Associates, Inc. Capacitive data transfer in an electronic lock and key assembly
USD881677S1 (en) 2017-04-27 2020-04-21 Knox Associates, Inc. Electronic key

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EP0823012A1 (fr) 1998-02-11
KR19980703882A (ko) 1998-12-05
JPH09221948A (ja) 1997-08-26

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