Classifications

• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03K—PULSE TECHNIQUE
  • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
  • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
  • H03K17/945—Proximity switches
  • H03K17/95—Proximity switches using a magnetic detector
  • H03K17/952—Proximity switches using a magnetic detector using inductive coils
  • H03K17/9537—Proximity switches using a magnetic detector using inductive coils in a resonant circuit
  • H03K17/9542—Proximity switches using a magnetic detector using inductive coils in a resonant circuit forming part of an oscillator
• • 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
• • E—FIXED CONSTRUCTIONS
  • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
  • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
  • E05B81/00—Power-actuated vehicle locks
  • E05B81/54—Electrical circuits
  • E05B81/64—Monitoring or sensing, e.g. by using switches or sensors
  • E05B81/76—Detection of handle operation; Detection of a user approaching a handle; Electrical switching actions performed by door handles
  • E05B81/77—Detection of handle operation; Detection of a user approaching a handle; Electrical switching actions performed by door handles comprising sensors detecting the presence of the hand of a user
• • E—FIXED CONSTRUCTIONS
  • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
  • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
  • E05B81/00—Power-actuated vehicle locks
  • E05B81/54—Electrical circuits
  • E05B81/64—Monitoring or sensing, e.g. by using switches or sensors
  • E05B81/76—Detection of handle operation; Detection of a user approaching a handle; Electrical switching actions performed by door handles
  • E05B81/78—Detection of handle operation; Detection of a user approaching a handle; Electrical switching actions performed by door handles as part of a hands-free locking or unlocking operation
• • 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
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03K—PULSE TECHNIQUE
  • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
  • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
  • H03K17/945—Proximity switches
  • H03K17/95—Proximity switches using a magnetic detector
  • H03K17/952—Proximity switches using a magnetic detector using inductive coils
  • H03K17/9522—Proximity switches using a magnetic detector using inductive coils with a galvanically isolated probe
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
  • B60R2325/00—Indexing scheme relating to vehicle anti-theft devices
  • B60R2325/10—Communication protocols, communication systems of vehicle anti-theft devices
  • B60R2325/103—Near field communication [NFC]
• • 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
• • 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
  • G07C2209/00—Indexing scheme relating to groups G07C9/00 - G07C9/38
  • G07C2209/60—Indexing scheme relating to groups G07C9/00174 - G07C9/00944
  • G07C2209/63—Comprising locating means for detecting the position of the data carrier, i.e. within the vehicle or within a certain distance from the vehicle
  • G07C2209/64—Comprising locating means for detecting the position of the data carrier, i.e. within the vehicle or within a certain distance from the vehicle using a proximity sensor

Definitions

• the present invention generally relates to a passive entry system for a vehicle comprising an identification tag of a user external to the vehicle housed in a badge, key or key-type box, and a door handle of the equipped vehicle. wireless communication means with the tag.
• the invention also relates to a vehicle door handle incorporated in such a passive input system and a method of unlocking a vehicle door. The invention applies more particularly to the field of the automobile.
• a passive input function allows access to the car without a mechanical key with a free hand function.
• a single action gesture on the door handle initiates a
• the action of pulling on the door handle 1 triggers a signal 2 from the car to a user identification device 3 to identify the latter. After a processing time, the identification device of the user returns a signal 4 containing its identification and a request to unlock an opening of the vehicle.
• proximity sensors for example in the form of capacitive sensors integrated in the handle of the door.
• the electronics integrated in the door handle for such a passive input system is shown in FIG. 2. It contains a wireless communication antenna 5, of the ferrite-wound antenna type for a low frequency application (125 KHz) and a proximity sensor 6, of the capacitive sensor type, for detecting the approach of a user identification device.
• the low frequency antenna allows the transport of the transmission signal to the target, i.e. IUD.
• the proximity sensor can detect a capacitance variation between a metal electrode present in the door handle and the target (seen as the other electrode of the capacitor).
• Another alternative existing for the realization of a proximity sensor is the use of an infrared barrier.
• document EP 1 270 349 describes a system for authorizing the starting of a motor vehicle.
• Document US 2010/194535 describes automatic means for triggering RFID transmitters.
• the document FR 2 755 925 describes a motor vehicle equipment comprising an antitheft device and a remote control device.
• An object of the present invention is to respond to
• a first aspect of the present invention relates to a passive vehicle input system comprising an identification tag of a user external to the vehicle and a door handle of the vehicle equipped with wireless communication means with the label and a proximity sensor of the label, characterized in that the proximity detector is formed by the wireless communication means arranged to detect the presence or absence of a mutual inductance between said communication means comparable to a first coil and a label similar to a second coil and to anticipate a communication with the label whose presence is detected before any action on the door handle.
• This system also reduces power consumption for the detection function that is related to the communication means.
• the fusion of the two detector and communication functions makes it possible to reduce the costs of the system.
• the detection of changes in the mutual inductance between the reader and the tag makes it possible to achieve the greatest possible detection distance.
• the wireless communication means and the proximity detector of a label are made by melting a material layer of the door handle. Such a fusion of the two functions is simple and inexpensive.
• the wireless communication means comprise a high frequency antenna and a near-field communication reader integrated in the same module of the door handle and in that the identification tag of a user. includes a near field communication interface.
• a near-field communication system still called NFC system
• the proximity detector is able to measure a phase difference between a signal sent and a signal received by the antenna as a function of the presence or absence of a label in the near field of the reader. The measurement of the phase shift of the signal makes it possible to optimize the anticipation of the presence of a label insofar as the phase difference is detected even before there is enough energy supplied by the antenna to the label to communicate. .
• a second aspect of the present invention relates to a door handle of a vehicle comprising means for
• the proximity detector is formed by the wireless communication means arranged to detect the presence or absence of mutual inductance between them and a tag and to anticipate communication with the tag whose presence is detected.
• the wireless communication means and the proximity detector of a label are made by melting a material layer.
• a third aspect of the present invention relates to a motor vehicle having a passive input system according to the first aspect.
• a fourth aspect of the present invention relates to a method of unlocking a vehicle door comprising the steps of: (i) transmitting a signal by means of an antenna of the reader placed in a module in a door handle; (ii) detecting the presence of a user identification tag by modifying the transmitted signal; (iii) anticipate a communication between the reader and the label in the event of detection of the presence of a label and unlock the opening of the vehicle in case of identification of the label detected; (iv) return to step (i) in the absence of a label.
• the measurement of the phase of the antenna requires about 200 ms, which is sufficient to detect a phase change of the signal.
• FIG. 1, already described, represents a passive input system according to the prior art
• FIG. 3 represents a block diagram of a passive input system according to an embodiment of the present invention.
• FIG. 4 represents the wireless communication means of the passive input system according to one embodiment of the present invention.
• FIG. 3 shows a block diagram of a passive input system according to a preferred embodiment of the present invention.
• the passive input system includes a door handle side and a user identification tag side.
• the system comprises a wireless communication reader 10, preferably a near-field communication reader, and an antenna 12 for transmitting and receiving signals.
• the reader and the antenna form means of
• wireless communication placed in a module in the handle.
• These wireless communication means can be likened to a first coil 12, called the reader coil.
• the passive input system comprises a tag 14 or key ring in which is integrated a user identification device (IUD) similar to a second coil 16, called the coil of the tag.
• IUD user identification device
• the wireless communication means including in particular the data-transmitting antenna and the proximity sensor of an IUD. In this way, the proximity switch automatically benefits from an alarm function, reduced power consumption and a wide range of detection thanks to the properties of the antenna.
• phase shift measurement 1 1 between a signal S E sent by the antenna and the received signal S R back depending on the presence or absence of a label.
• this feedback signal has no phase shift when no label is present near the door handle.
• a label is near the door handle, a phase shift is detected.
• the near-field communication reader generates an RF radio frequency field that is emitted via the antenna 12.
• a high-frequency antenna 13.56 MHz, will be used.
• near field communication according to ISO14443A and ISO15693.
• Figure 4 shows the wireless communication mode between the near field communication reader (INIT NFC) and the user identification tag (NFC target).
• the reader generates a radio frequency field.
• the antenna then emits periodically (for example every 200 ms) a signal S E to detect whether a tag is in the vicinity, ie in the communication field, so as to anticipate a communication with a view to identification of the user before unlocking an opening of the vehicle.
• a signal S E to detect whether a tag is in the vicinity, ie in the communication field, so as to anticipate a communication with a view to identification of the user before unlocking an opening of the vehicle.
• S R load modulation
• One goal is to optimize and achieve the greatest detection distance possible to predict the presence of the label / key ring on further upstream before the door handle is actuated by the user to anticipate communication, identification and unlocking.
• the system can be likened to two coils, a reader coil and a label coil.
• M mutual inductance
• This mutual inductance depends on the physical parameters of the two coils as well as other parameters.
• the mutual inductance is given by the following equation:
• M the mutual inductance
• ⁇ 0 the electrical permittivity
• N 2 the number of turns of each of the coils
• the idea is to use the effect of the mutual inductance to anticipate the presence of the tag or key-ring.
• the reader can detect the presence of a label at the maximum of the distance for this passive mode of communication in the near field and thus to ensure a sufficient time to anticipate and establish a communication in order to identify the label before any action on the door handle.
• Detection and use of the mutual inductance factor (M) can be obtained by checking the resonance factor of the antenna.
• M mutual inductance factor
• the near-field communication reader has a function of optimizing the output power of the reader, for example by tuning the antenna with variable capacitors 17 internal to the reader.
• the near-field communication reader measures the phase of the antenna and then uses this information as a proximity detector of a tag.

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

Applications Claiming Priority (2)

Publications (1)

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ID=43759783

Family Applications (1)

Country Status (3)

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Citations (1)

Family Cites Families (3)

• 2010
  • 2010-08-06 FR FR1003290A patent/FR2963711B1/fr active Active
• 2011
  • 2011-07-28 EP EP11736381.2A patent/EP2601741A1/de not_active Ceased
  • 2011-07-28 WO PCT/EP2011/063006 patent/WO2012016905A1/fr active Application Filing

Patent Citations (1)

Non-Patent Citations (1)

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