• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a bi-directional detection device (D ') approaching a portable equipment (P) for free-hand access by near-field to a vehicle, said device (D') comprising a communication antenna ( A) having a near-field communication frequency (Fc), the device comprising: A first passive inductive sensor (S1) facing the outside of the vehicle (EXT), a second passive inductive sensor (S2) facing the vehicle interior (INT), the two sensors being located vis-a-vis, separated by a ferrite (F), and receiving the electromagnetic field emitted by the communication antenna, and being able to detect the approach of the portable equipment; means for measuring (M1) a first voltage (V1) across the first sensor and measuring means (M2) for a second voltage (V2) across the second sensor; of comparison (M3) between the first voltage and the second voltage to detect the approach of portable equipment from outside or from within the vehicle.
    公开号:FR3043512A1
    申请号:FR1560602
    申请日:2015-11-05
    公开日:2017-05-12
    发明作者:Mohamed Cheikh
    申请人:Continental Automotive GmbH；Continental Automotive France SAS；
    IPC主号:
    专利说明:

    The invention relates to a bidirectional detection device for approaching a portable equipment with free access to a vehicle and an associated detection method.
    More particularly, the invention applies to the approach detection of a portable hands-free access device by an NFC-type communication, an acronym for Near Field Communication, or near-field communication, ie to say a radiofrequency communication at 13.56 Mhz, of short range, of the order of ten centimeters maximum.
    Nowadays, it is common to use Near Field Magnetic Coupled Communication Technology, such as NFC technology. This communication technology can be used for many applications such as for example to pay without contact using for example a bank card or a mobile device such as a mobile phone or a digital tablet. This technology can also be implemented to allow a user to access a vehicle and start it using for example a mobile phone.
    This technology has the advantage of allowing the exchange of identifier between for example a mobile phone and a vehicle, at a secure distance, of the order of ten centimeters, and therefore to allow either unlocking or starting a vehicle safely.
    It is therefore known to equip a vehicle with means of free hand access by NFC, either for unlocking or for starting said vehicle.
    For this purpose, the vehicle generally comprises, for unlocking the opening of the vehicle, a first NFC antenna, facing the outside of the vehicle, for example located in a door handle, and a first NFC reader, connected to a microcontroller and for starting the vehicle engine, a second NFC antenna, located inside the vehicle, for example, in the dashboard, and a second NFC reader, connected to a second or the same microcontroller.
    In other words, the vehicle comprises two identical NFC detection systems (NFC antenna, NFC reader and microcontroller) at two different locations on the vehicle, each dedicated to an action: unlocking or starting the vehicle.
    It will be understood that for reasons of cost and ergonomics, it would be desirable to group these two NFC detection systems into one, located in a single position on the vehicle, accessible from the outside and the inside, by example in the door of the driver of the vehicle or in a window of said window to detect the approach of the equipment of the user, whether it is located outside or inside the vehicle to trigger the corresponding action, unlocking or starting.
    The bidirectional NFC detection device D of the prior art is illustrated in FIG.
    A first NFC antenna A1 is oriented towards the outside of the vehicle EXT and a second antenna NFC A2 is oriented towards the inside of the vehicle INT, said two antennas A1, A2 are located opposite each other, separated by two layers of ferrites F1, F2, themselves spaced apart by a copper layer C located on a printed circuit board 10.
    The term "NFC antenna" is used here to mean an RFID tag, the acronym for "Radio Frequency Identification" or radio frequency identification tag.
    The proximity of the two NFC antennas creates interference, and requires the presence of two additional ferrites F1, F2 (as shown in Figure 1), separated by a conductive copper layer C.
    The copper layer C can dissipate the few electromagnetic currents that pass through the ferrites F1, F2, indeed, they do not provide perfect shielding of electromagnetic waves received by NFC antennas A1 and A2. A small amount of the electromagnetic waves received by the first or the second NFC antenna A1, A2 passes through the first ferrite F1 or the second ferrite F2 and then disturbs the other of said two antennas NFC A1, A2. The copper layer C has the advantage of dissipating these electromagnetic waves, thus preventing them from disturbing the other NFC antenna A1, A2.
    Each NFC antenna, the first NFC antenna A1 and the second NFC antenna A2, is connected to a dedicated NFC reader, respectively to a first NFC reader 21, and to a second NFC reader 22, both connected to a microcontroller 20.
    This bidirectional detection device D of the prior art has the disadvantages of being expensive (two ferrites F1, F2, two NFC readers, 21,22 and a layer of copper C), and, because of the proximity between the first antenna and the second antenna NFC A1, A2, degrade significantly their performance, despite the presence of two ferrites F1, F2 and additional copper layer C. The invention proposes a bidirectional detection device that overcomes these disadvantages. The invention proposes a bidirectional detection device for approaching a portable equipment for free-hand access by near-field to a vehicle, said device comprising a communication antenna having a near-field communication frequency, and a quality factor. and predetermined maximum bandwidth, in order to communicate with said portable equipment, a reader, connected to a microcontroller, and the portable equipment being provided with near-field wireless communication means, said device being remarkable in that it comprises furthermore: • A first passive inductive sensor oriented towards the outside of the vehicle, having a first resonance frequency, situated in a value window around the communication frequency and different from said communication frequency and, having a first factor of quality higher than the quality factor of the communication antenna, • a second sensor passive inductive sensor, having a second resonance frequency, located in a value window around the communication frequency and different from the communication frequency, and different from the first resonance frequency, and having a second a quality factor higher than the quality factor of the communication antenna, the first passive inductive sensor and the second passive inductive sensor being located facing each other, separated by a ferrite, and receiving the electromagnetic field emitted by the communication antenna; means for measuring a first voltage across the first passive inductive sensor and means for measuring a second voltage across the second passive inductive sensor; means for comparing the first voltage with the first voltage. second voltage to detect the approach of the portable equipment from outside or e from the inside of the vehicle.
    The device of the invention therefore makes it possible in an ingenious manner to detect the approach of the portable equipment coming from outside or inside the vehicle, in order to communicate with the last and to trigger the actions desired by the user. .
    Preferably, the absolute value of a first difference between the first resonance frequency and the communication frequency and the absolute value of a second difference between the second resonance frequency and the communication frequency is greater than the maximum bandwidth of the first resonance frequency. communication antenna.
    Advantageously, the first passive inductive sensor and the second passive inductive sensor respectively comprise a first coil connected to a first capacitor, and a second coil connected to a second capacitor, the first and second coils being of identical dimensions and the first quality factor. being equal to the second quality factor.
    In a preferred embodiment, the communication antenna, the first coil, the second coil and the ferrite are concentric and arranged in parallel planes.
    And the first and second coils are each of smaller dimensions than the dimensions of the communication antenna.
    Conveniently, the ferrite is of substantially equal size to any one of the first or second coil. The invention also relates to a bidirectional approach detection method using the detection device according to one of the characteristics listed above, said detection method being remarkable in that it comprises the following steps: voltage at the terminals of the first passive inductive sensor, and • a second voltage is measured at the terminals of the second passive inductive sensor, and • the first voltage is compared with the second voltage to distinguish it from the portable equipment coming from outside. of the vehicle, the approach of the portable equipment coming from inside the vehicle, • if the first voltage is lower than the second voltage, then the portable equipment is located outside the vehicle, otherwise the Portable equipment is located inside the vehicle.
    Finally, the invention applies to any motor vehicle comprising a bidirectional approach detection device according to any of the characteristics listed above. Other features and advantages of the present invention will be better understood on reading the description which follows (by way of non-limiting example) with reference to the appended figures in which: FIG. 1 (previously explained) schematically illustrates a view in section of the bidirectional detection device D of the prior art, - Figure 2 schematically illustrates a sectional view of the bidirectional detection device D 'according to the invention, - Figure 3 schematically shows a top view of the detection device. Bidirectional of the invention, - Figure 4 schematically shows the quality factors QSi, Qs2 of inductive sensors, compared to quality factor QA of the communication antenna, - Figure 5 schematically represents the approach of a portable equipment P of a user, located outside the vehicle, towards the detection device D 'bidirectio 6 schematically illustrates the voltages across the inductive sensors, according to the position of the portable equipment P as shown in Figure 5.
    The bidirectional detection device D bidirectional approach of a portable equipment P free access to a vehicle, according to the invention is illustrated in Figure 2.
    The detection device D 'comprises a communication antenna A in the near field, called NFC, in order to communicate with the portable equipment P (not shown in FIG. 2), as well as an NFC reader 23, connected to said antenna A, itself electrically connected to a microcontroller 20 '. The communication antenna A is characterized by a communication frequency Fc of the order of 13.56 MHz, a bandwidth Bd of value between 108 kbit / s and 868 kbit / s and a predetermined QA quality factor. . The communication antenna A transmits, at the request of the microcontroller 20 ', periodically an electromagnetic field in order to communicate with a portable equipment P being within the range of said communication antenna A. The portable equipment P is equipped with communication means wireless in the near field in order to be able to communicate with the detection device D ', in this case in order to be able to exchange an identifier with the latter, and to allow the unlocking or starting of the vehicle. The invention relates to a bi-directional detection device for detecting the approach of a portable device P compatible, that is to say equipped with NFC communication means, to said communication antenna A, that the equipment Portable P is inside INT or outside the vehicle's EXT.
    The detection device D 'according to the invention makes it possible to distinguish the approach of the portable equipment P located inside the vehicle INT, which means that the user then requests the start of the vehicle, the approach portable equipment located outside the vehicle's EXT, which means that the user then requests the unlocking of his vehicle.
    Of course, once the detection is carried out, the unlocking or starting action of the vehicle will be authorized only after the exchange of identifier between the communication antenna A and the portable equipment P and validation that the equipment portable P is well matched to the vehicle.
    According to the invention, the detection device D 'bidirectional further comprises: • A first passive inductive sensor S1 facing outward EXT of the vehicle, • a second passive inductive sensor S2 oriented towards the inside INT of the vehicle, • the first passive sensor and the second passive inductive sensor S1, S2 are located facing each other, separated by a ferrite F, and arranged in such a way that they receive the electromagnetic field coming from the communication antenna A, said two inductive sensors S1, S2 therefore each have at their terminal a voltage, a first voltage V1 and a second voltage V2, • measuring means M1 of a first voltage V1 across the first sensor S1 and measuring means M2 a second voltage V2 across the second passive inductive sensor S2; and comparing means M3 between the first voltage V1 and the second voltage V2.
    The first sensor S1 and the second passive inductive sensor S2 each have a resonance frequency, respectively a first resonance frequency Fri, and a second resonance frequency FR2, comprised in a value window around the communication frequency Fc but different from the communication frequency Fc of the communication antenna A.
    In a preferred embodiment, the absolute value of the difference between the first resonance frequency FR1 and the communication frequency Fc and the absolute value of the difference between the second resonance frequency FR2 and the communication frequency Fc is greater than to the predetermined maximum bandwidth of the communication antenna A, in other words:
    And
    With: FR1: Resonance frequency of the first passive inductive sensor S1, FR2 Resonance frequency of the second passive inductive sensor S2,
    Fc: Communication frequency of the communication antenna A,
    Bdmax: maximum bandwidth of the communication antenna A.
    In other words, the first resonance frequency FR1 and the second resonance frequency FR2 are outside the bandwidth Bd of the communication antenna A. The two inductive sensors S1, S2 do not thus disturb the data sent. and received by the communication antenna A.
    For example :
    Fc = 13.56 Mhz,
    And FR1 = 12.56 Mhz,
    FR2 = 14.56 MHz,
    With Bdmax = 868 Kbps.
    The first passive inductive sensor S1 and the second passive inductive sensor S2 each have a quality factor, respectively a first quality factor QSi and a second quality factor QS2 higher than the quality factor QA of the communication antenna A and are therefore sensitive to the approach of any portable equipment P having a near-field communication (NFC) frequency.
    For example :
    Qa <35,
    And QSi> 80,
    Qs2> 80.
    Preferably, the first passive inductive sensor S1 and the second passive inductive sensor S2 are respectively in the form of a first copper coil B1, not supplied with voltage, connected to a first capacitor C1 and in the form of a second coil B2 copper, not supplied with voltage, connected to a second capacitor C2 (see Figure 3), and the two coils B1, B2 are of identical dimensions.
    The first capacitor C1 and the second capacitor C2 are matching capacitors for adjusting the first resonance frequency FR1 and the second resonance frequency FR2 to the desired values, in our example at values close to the communication frequency Fc, but not included in the bandwidth Bd of the communication antenna A.
    Preferably, the communication antenna A, the first coil B1, the second coil B2, and the ferrite F are concentric (see center O in Figure 3) and arranged in parallel planes P1, P2, P3 (see FIG. 2).
    And the first coil B1 and the second coil B2 are smaller than the dimensions of the communication antenna A (see Figure 3).
    The ferrite F is of dimensions substantially equal to the dimensions of the coils B1, B2 (see FIG.
    The operation of the bidirectional detection device D according to the invention will now be described below.
    The communication antenna A emits, on command of the microcontroller 20 ', an electromagnetic field in a near-field cyclically around it. Said communication antenna A is disposed in the vehicle such that a part of the electromagnetic field is directed towards the inside of the vehicle INT and another part is directed towards the outside of the vehicle EXT. The communication antenna A is for example integrated in the window of a vehicle door or in the metal upright of this window.
    Any portable equipment P, equipped with NFC communication means located for example outside the vehicle EXT, and approaching the first passive inductive sensor S1 (see FIG. 5), modifies the electromagnetic field emitted by the antenna of FIG. A communication and creates a mismatch of the first resonance frequency FR1 of the first coil B1, causing a decrease of the first voltage V1 across said first coil B1 (see Figure 6).
    The second coil B2, meanwhile, being separated and electromagnetically insulated from the first coil B1 by the ferrite F, and facing the inside of the vehicle V, it does not undergo electromagnetic disturbances due to the presence of the Portable equipment P. The second voltage V2 across the second coil B2 remains substantially constant, despite the approach of the portable equipment P (see Figure 6).
    The decrease of the first voltage V1 is proportional to the distance d separating the portable equipment P from the first passive inductive sensor S1.
    When the portable equipment P is outside the vehicle EXT at a distance d from the detection device D ', as shown in FIG. 6, the value of the first voltage V1d of the first passive inductive sensor S1 is smaller than the value of the second voltage V2d of the second passive inductive sensor S2.
    Conversely, when the portable equipment P is inside the vehicle INT, and approaches the second passive inductive sensor S2 (not shown in FIG. 5), it modifies the electromagnetic field emitted by the communication antenna. A and creates a mismatch of the second resonant frequency FR2 of the second coil B2, causing a decrease of the second voltage V2 across said second coil B2 (not shown in Figure 6).
    The first coil B1 for its part, for similar reasons, previously mentioned (presence of the ferrite F), does not undergo electromagnetic disturbances due to the presence of the portable equipment P. And when the portable equipment P is at inside the vehicle INT at a distance from the detection device D ', the value of the second voltage V2d' is less than the value of the first voltage V1d '.
    By measuring and then comparing the first voltage V1 with the second voltage V2, the detection method of the invention thus makes it possible to distinguish the approach of the portable equipment P towards the detection device D'when it is at the outside of the vehicle EXT, from the approach of the portable equipment P towards the detection device D 'when it is inside the vehicle INT.
    The detection method of the invention therefore comprises the following steps: • a first voltage V1 is measured at the terminals of the first passive inductive sensor S1, and • a second voltage V2 is measured at the terminals of the second passive inductive sensor S2, and • compares the first voltage V1 with the second voltage V2 to distinguish the approach of the portable equipment P from outside the vehicle EXT, the approach of the portable equipment P from the vehicle interior INT, • if the first voltage V1 is lower than the second voltage V2, then the portable equipment is located outside the vehicle EXT, otherwise it is located inside the vehicle INT.
    Once the detection is carried out, by the detection method of the invention, the exchange of identifier between the communication antenna A and the portable equipment P follows, and if the identifier is validated, the corresponding actions can then be implemented, that is to say either the unlocking of the opening of the vehicle or the starting of the vehicle engine. The invention thus makes it possible inexpensively (two coils, and two capacitors) to distinguish the approach of a portable equipment from the outside of the vehicle towards the NFC communication antenna, representative of the user's will. to unlock his vehicle from the approach of the portable equipment from the vehicle interior to the NFC communication antenna, representative of the user's desire to start his vehicle.
    The detection device D 'of the invention is particularly advantageous with respect to the detection device D of the prior art, since it comprises fewer components (a single ferrite, no copper layer, and a single NFC reader, instead of two ferrites, a copper layer and two NFC readers), in particular the absence of a second NFC antenna eradicates the problem of potential interference between the two antennas NFC of the detection device D of the prior art.
    权利要求:
    Claims (8)
    [1" id="c-fr-0001]
    A bidirectional detection device (D ') for approaching a portable equipment (P) with free access by a near-field to a vehicle, said device (D') comprising a communication antenna (A) having a frequency communication method (Fc), and a predetermined quality factor (QA) and maximum bandwidth (Bdmax) for communicating with said portable equipment (P), a reader (23) connected to a microcontroller (20). '), and the portable equipment (P) being provided with near-field wireless communication means, said device (D') being characterized in that it further comprises: • a first passive inductive sensor (S1) oriented to the outside of the vehicle (EXT), having a first resonance frequency (FR1), located in a value window around the communication frequency (Fc) and different from said communication frequency (Fc) and, having a first higher quality factor (QSi) to the quality factor (QA) of the communication antenna (A), • a second passive inductive sensor (S2) oriented towards the inside of the vehicle (INT), having a second resonance frequency (QS2), located in a value window around the communication frequency (Fc) and different from the communication frequency (Fc), and different from the first resonance frequency (FR1), and having a second quality factor (QS2) higher than the quality factor (QA) of the communication antenna (A), • the first passive inductive sensor (S1) and the second passive inductive sensor (S2) being located facing each other, separated by a ferrite (F), and receiving the electromagnetic field emitted by the communication antenna (A), measuring means (M1) of a first voltage (V1) across the first passive inductive sensor (S1) and measuring means (M2) of a second voltage (V2) across the second passive inductive sensor (S2), comparison means (M3) between the first voltage (V1) and the second voltage (V2) for detecting the approach of the portable equipment (P) coming from outside (EXT) or coming from the inside (INT) of the vehicle.
    [2" id="c-fr-0002]
    2. bidirectional approach detection device (D '), according to the preceding claim, characterized in that the absolute value of a first difference between the first resonance frequency (FR1) and the communication frequency (Fc) and the an absolute value of a second difference between the second resonant frequency (FR2) and the communication frequency (Fc) is greater than the maximum bandwidth (Bdmax) of the communication antenna (A).
    [3" id="c-fr-0003]
    Bidirectional detection device (D ') according to one of the preceding claims, characterized in that the first passive inductive sensor (S1) and the second passive inductive sensor (S2) respectively comprise a first coil (B1 ) connected to a first capacitor (C1), and a second capacitor (B2) connected to a second capacitor (C2), the first and second coils (B1, B2) being of identical dimensions and the first quality factor (QSi) being equal to the second quality factor (QS2).
    [4" id="c-fr-0004]
    4. bidirectional approach detection device (D '), according to the preceding claim, characterized in that, the communication antenna (A), the first coil (B1), the second coil (B2) and the ferrite ( F) are concentric and arranged in parallel planes (P1, P2, P3).
    [5" id="c-fr-0005]
    5. bidirectional approach detection device (D ') according to one of claims 3 or 4, characterized in that the first and second coils (B1, B2) are each of smaller dimensions than the dimensions of the antenna of communication (A).
    [6" id="c-fr-0006]
    6. bidirectional approach detection device (D '), according to any one of claims 3 to 5, characterized in that the ferrite (F) is of dimensions substantially equal to any one of the first or second coil (B1, B2).
    [7" id="c-fr-0007]
    7. Bidirectional approach detection method using the detection device (D ') according to any one of the preceding claims, said detection method being characterized in that it comprises the following steps: • A first voltage is measured ( V1) across the first passive inductive sensor (S1), and • a second voltage (S2) is measured at the terminals of the second passive inductive sensor (S2), and • the first voltage (V1) is compared with the second voltage (V2). ) to distinguish the approach of portable equipment (P) from outside the vehicle (EXT), approaching portable equipment (P) from inside the vehicle (INT) • if the first voltage (V1) is lower than the second voltage (V2), then the portable equipment (P) is located outside the vehicle (EXT), otherwise the portable equipment (P) is located inside the vehicle (INT).
    [8" id="c-fr-0008]
    8. A motor vehicle characterized in that it comprises a bidirectional approach detection device (D ') according to any one of claims 1 to 6.
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    FR3043512B1|2017-11-17|
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    引用文献:
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    法律状态:
    2016-11-18| PLFP| Fee payment|Year of fee payment: 2 |
    2017-05-12| PLSC| Publication of the preliminary search report|Effective date: 20170512 |
    2017-11-21| PLFP| Fee payment|Year of fee payment: 3 |
    2019-11-20| PLFP| Fee payment|Year of fee payment: 5 |
    2020-11-20| PLFP| Fee payment|Year of fee payment: 6 |
    2021-11-22| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1560602A|FR3043512B1|2015-11-05|2015-11-05|BIDIRECTIONAL DETECTION DEVICE FOR APPROACHING A PORTABLE HANDS-FREE ACCESS EQUIPMENT TO A VEHICLE AND DETECTION METHOD THEREOF|FR1560602A| FR3043512B1|2015-11-05|2015-11-05|BIDIRECTIONAL DETECTION DEVICE FOR APPROACHING A PORTABLE HANDS-FREE ACCESS EQUIPMENT TO A VEHICLE AND DETECTION METHOD THEREOF|
    CN201680077818.0A| CN108476039B|2015-11-05|2016-11-03|Bidirectional detection device for the approach of a portable device for hands-free access to a vehicle and associated detection method|
    KR1020187015906A| KR20180080304A|2015-11-05|2016-11-03|Device and related detection method for detecting bi-directional approach of a portable device for hands-free access to a vehicle|
    US15/772,561| US10144392B1|2015-11-05|2016-11-03|Device for a two-way detection of the approach of a portable apparatus for hands-free access to a vehicle and associated detection method|
    PCT/EP2016/001824| WO2017076500A1|2015-11-05|2016-11-03|Device for two-way detection of the approach of a portable apparatus for hands-free access to a vehicle and associated detection method|
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