• 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:
    System for dynamically reading the data of a linear polarized antenna transponder of a tire of a vehicle in which, the system comprising at least one antenna able to receive data transmitted by the transponder and at least one reader coupled to the antenna capable of reading and storing the transponder data, wherein the antenna is a linearly polarized antenna with a vertical electric field.
    公开号:FR3013907A1
    申请号:FR1361687
    申请日:2013-11-27
    公开日:2015-05-29
    发明作者:Julien Destraves；Choffray Maxime Urbin；Pierre Voissier
    申请人:Michelin Recherche et Technique SA Switzerland ；Compagnie Generale des Etablissements Michelin SCA；Michelin Recherche et Technique SA France；
    IPC主号:
    专利说明:

    [0001] FIELD OF THE INVENTION [0001] The present invention relates to a system for dynamically reading data recorded in a transponder of a tire, in particular for automatically identifying the tire during its transition to a tire. proximity of the system. STATE OF THE ART [0002] EP 2 202 099 A1 discloses a dynamic data reading system of a linear polarized antenna transponder of a tire of a vehicle. This system combines an antenna capable of receiving data transmitted by the transponder and a reader coupled to the antenna capable of reading and storing the transponder data. This system uses a circular polarization antenna. This system is used in particular to automatically identify the serial numbers of the tires of a competition vehicle when the vehicle passes along a gantry placed for example at the entrance of the circuit. The serial numbers of the tires are entered in the transponder memory placed on the surface or in the tire structure. However, it is noted that this system does not allow a robust reading of transponder data. Reading is indeed almost impossible, whatever the speed of movement of the vehicle, in certain relative positions of the system and the transponder of the tire. Brief description of the invention [0005] The subject of the invention is a system for dynamically reading the data of a transponder of a tire of a vehicle comprising at least one antenna capable of receiving data transmitted by the transponder and at least one reader coupled to said antenna adapted to read and store the transponder data. This system is characterized in that the antenna is a linear polarization antenna with a vertical electric field. P10-3188 EN -2 [0006] The fact of using for the antenna of the system a linear and non-circular polarization antenna as previously has the advantage of giving a gain of 3 dB for the reading power when the antenna the system is aligned with the transponder antenna. The choice of a vertical electric field also has the advantage of practically suppressing reverberation phenomena of the waves against the ground. This results in a very noticeable improvement in the robustness of reading of the data entered in the transponders of the tires by the system. [0008] Preferably, the antenna of the system has a gain of less than or equal to 6 dBi. [0009] For example, in Europe, the power output across the antenna may be less than or equal to 29.15 dBm. As the gain of the antenna will be 6 dBi, the total power radiated by such an antenna is less than or equal to 35.15 dB (2 W ERP), which is compatible with European standards. By way of example, in the USA, an antenna with a gain of 6 dBi and a maximum driving power of 30 dBm can be used to comply with the standards. The maximum radiated power is thus 36 dB (4 W EIRP). Advantageously, the reading system according to one of the objects of the invention comprises at least two linearly polarized antennas with a vertical electric field spaced from each other in the rolling direction of the tire of a distance less than 1.20 meters and preferably of the order of 1 meter. It is found experimentally that an antenna as previously described can communicate continuously over a distance of displacement of the tire in the direction normal to the direction of the antenna of the order of one meter at least, taking into account the maximum speed of driving of the vehicle of the order of 50 to 60 km / h and the interrogation cycle of the reader. The presence of two adjacent antennas thus ensures that there is at least one ideal reading position for a perimeter tire also of the order of two meters and usually at least two ideal reading positions. The reading positions are ideal when the two antennas of the transponder of the tire and the reading system have the same orientation, that is to say that the antenna of the transponder of the tire is aligned vertically. P10-3188 EN -3 [0014] Preferably, the two antennas are arranged at a height relative to the driving ground substantially equal to that of the axis of rotation of the tire. According to an advantageous embodiment, the two antennas are driven alternately. This control mode avoids interference between the two antennas. Such interference could occur as soon as both antennas are operating at the same time and with a frequency difference of less than 2 MHz. Preferably, the two antennas are connected to the same reader. This simple embodiment ensures that there will be no interference between the two antennas. According to an advantageous embodiment, the tire transponder is a UHF RFID in which is inscribed a unique identification number of the tire. The invention also relates to a gantry for dynamic reading of vehicle tire transponder data disposed along a taxiway of the vehicles, characterized in that it comprises on either side of the taxiway a reading system as previously described. The invention particularly relates to tires for equipping tourism-type motor vehicles, SUV ("Sport Utility Vehicles"), two wheels (including motorcycles), aircraft, such as industrial vehicles chosen from light trucks, 20 "weight "heavy" - that is to say metro, bus, road transport equipment (trucks, tractors, trailers), off-the-road vehicles such as agricultural or civil engineering -, other transport vehicles or handling. Definitions [0022] The power of transponder reading systems is subject to accurate standards in different parts of the world. The power radiated by a reader + antenna system corresponds to the total power radiated in the room. An isotropic antenna is used as a reference for calculation, an isotropic antenna means a spherical or isotropic antenna. All real antennas are directional to varying degrees and thus have a higher power density in their main direction compared to an isotropic (hypothetical) antenna. In order to compare different antennas with each other, the notion of equivalent isotropic radiated power EIRP (equivalent isotropic radiated power) has been introduced. This notion represents the effective power that must be applied to an isotropic antenna to provide the same power density in the direction of the main antenna beam. We have: EIRP = PoxG, With: Po the transmitted power and G, the gain of the antenna. The equivalent radiated power by taking as reference that of a dipole half-wave antenna is also commonly used "ERP" (effective radiated power). We then have: ERP = Po + Gd + - 1.64 With: Gd the gain of an equivalent dipole antenna. DESCRIPTION OF THE FIGURES The appended figures illustrate a portal for dynamic reading of vehicle transponder data in the case of motor racing vehicles which require a reading at a fast speed of the order of 50 to 60 km / h: FIG. 1 shows an exemplary transponder, a UHF RFID; - Figure 2 shows in perspective a partial section of a tire comprising a transponder on its surface; - Figure 3 shows a schematic view of a data reading system; and - Figure 4 schematically illustrates the operation of the data reading system. Examples of embodiments of the invention FIG. 1 shows an exemplary transponder, a transponder with passive radio frequency identification 10 provided with two antennas 12 forming a dipole. This type of transponder is generally designated by the acronym RFID. Such a transponder comprises, stored in a memory, a unique identification number of the tire. It may also include other data relating for example to the manufacture or type of tire. The transponder 10 is a UHF RFID, operating in a frequency range of the order of 850 to 950 MHz. It comprises a chip 14 fixed on a support 16 and connected to two antennas 12 of substantially helical shape. The transponder 10 can be placed inside the structure of a tire 22 during the manufacture thereof or fixed to its outer surface during an operation subsequent to the baking of the tire as illustrated in FIG. pneumatic 22 is presented very schematically. It comprises a tread 24, two sidewalls 26, two beads 28, an inner liner 30 and is mounted on a wheel 32. A transponder 10 is fixed to the outer surface of the sidewall 26 by means of a rubbery patch 27. The UHF RFID transponder 10 presented has a memory and a data transmission circuit stored in the memory to an external reader. The transponder may be active but is usually passive and receives RF signals from an external source which transmit to it in particular the energy necessary to trigger multiple transmissions of the data contained in the transponder memory. A unique tire identification number is assigned by the tire manufacturer either during manufacture or later. This number makes it possible to follow the tire during all its life. This number can follow the recommended format "electronic product code" (EPC) or any other format. Figure 3 schematically shows a gantry dynamic reading of data 40 according to an object of the invention. This gantry 40 consists of two identical systems 50 and 70 each disposed on one side of a running track of a vehicle. The arrow F indicates the driving direction of the vehicle. Each system as illustrated comprises two housings 52 and 54 on one side, 72 and 74 on the other and three associated passage detectors P10-3188 FR-566 and 76 (D1), 58 and 78 (D2), as well as 60 and 80 (D3). The system 40 also includes a computer or PC 42 for receiving and processing the data. Each box includes an antenna 53, 55 for transmitting and receiving RF signals to and from the transponders of the vehicle tires. The boxes are made of a material that does not disturb the RF signals, such as polypropylene. The antennas are directional and their direction of greater transmission / reception is oriented towards the vehicle and normal to the direction of movement of the vehicle. The boxes 54 and 74 also include a controllable switch 62, a programmable logic controller 64 and a UHF RFID reader 66. In the case of the system 50, see FIG. 4, the reader 66 is capable of being coupled to antennas 53 and 55 for reading and storing transponder data; it is a commercial RFID reader-interrogator; the controllable switch 62 is connected to the two antennas 53 and 55, on the one hand and to the programmable logic controller 64, on the other hand; its role is to provide selective coupling between reader 66 and each of antennas 53 and 55; the switching speed of the switch 62 is less than 50 las, of the order of 10 las; the programmable logic controller 64 is connected to the switch 62, on the one hand and to the three pairs of tire passage detectors 56 and 76 (D1), 58 and 78 (D2), 60 and 80 (D3), on the other hand ; its role is to control the switch 62 as a function of the signals of these 20 tire passage detectors 56 and 76 (D1), 58 and 78 (D2), 60 and 80 (D3). The reader 66 and the controller 64 are also connected to the computer or PC 42 to transmit the data read and the sequence of events noted by the controller. Each pair of passage detectors is disposed on the running track upstream or downstream of an antenna. These detectors may be of any type, for example with optical, laser, infra-red, etc .; the passage of a tire is then linked to the rupture of the light signal in the case of an optical detector or linked to the overpressure due to the passage of the tire in the case of a piezoelectric pressure sensor. The distance, in the running direction of the vehicle, between the first pair of detectors D1 and the axis of the first antenna is of the order of half / effective reading length of this first antenna. The second pair of detectors D2 is placed P10-3188 FR -7 substantially in the middle of the two antennas. Finally, the third pair of detectors is placed downstream of the second antenna at a distance of the order of half the effective reading distance of the second antenna. As this effective reading length of each antenna is of the order of one meter, in the system 40, the detectors are arranged, in the running direction of the vehicle, about 50 cm on either side of each antenna. The detectors upstream of each of the antennas serve to indicate the arrival in the reading field of the antenna downstream of a tire, the third pair of detectors serves to indicate the end of the passage of a tire. ie the output of the reading system of this tire. The third pair of detectors may also be replaced by a stopping device beyond a given time. The response time of the passage detectors is of the order of a micro second. The effective reading distance of an antenna is in particular a function of the types of antennas, the parameter setting of the readers, the types of transponders and tires used, it also depends on the speed of passage of the vehicles. This distance can be estimated experimentally and corresponds to the distance during which the data reading conditions of a transponder associated with a tire are robust and reliable. The rays of the optical detectors are placed at a minimum distance from the taxiing ground. This distance is preferably less than 3 cm, of the order of 1 to 2 cm. This allows not to be disturbed by the body of the vehicle. Each antenna is placed at a distance between 0.80 and 1.20 meters from the sidewall of the tires of the vehicles whose transponders must be read during the passage of the vehicle. Each antenna is also placed vertically so that its center is at the axis of rotation of the tires of the vehicles to ensure good reading conditions when both antennas of the transponder and the antenna of the system are both aligned vertically. Each antenna of the boxes 52, 54, 72, 74 is a linear polarization antenna with a vertical electric field. This allows the maximum read power to be used when both antennas of the transponder and the system antenna are both vertically aligned; this also minimizes signal reverberation or RF waves between system antennas and transponders against the ground. P10-3188 EN -8 [0039] The application presented has a strong requirement, that of being able to read the transponder data when the vehicles pass along the system at a maximum speed of the order of 50 to 60 km / h. That is to say that in 1 ms, the vehicle travels a distance of 14 to 17 mm. The use of passage sensors with a response time of the order of one us and a controllable switching time switch of less than 50 us makes it possible to immediately start reading the first antenna and then to switch very quickly from the first to the second when the second detector indicates the arrival of the tire in front of this second antenna. It is thus not subject to variations in response time of the various readers of the trade. In addition, this system ensures that the two antennas are controlled alternately, which ensures that there is no risk of interference between measurements. The operation of the gantry according to one of the objects of the invention is as follows: When a vehicle is in front of the gantry 40 in the direction indicated by the arrow F, the front tires will do so. triggering the first detector barrier D1, references 56 and 76. This triggering is transmitted to the logic controller 64 which immediately activates the reader 66 and via the switch 62 the antennas A1 of the boxes 52 (reference 53) and 72 These antennas interrogate the transponders of the two front tires of the vehicle and collect and store the data transmitted by these transponders. When the front tires are triggered the second detector barrier D2, references 58 and 78, this signal is transmitted to the controller which instructs the switch 62 to switch the reader 66 of first antennas A1 (53) to the second antennas A2 of the boxes 54 (reference 55) and 74. These second antennas 25 interrogate the transponders of the two front tires of the vehicle and collect and store the data transmitted by these transponders. The switching speed is such (of the order of 10 us) that the reading and recording of the data transmitted by the transponders is almost continuous from the first antennas to the second. P10-3188 EN -9 [0046] Then the tripping of the third detector barrier D3 (references 60 and 80) indicates that the front tires of the vehicle are out of the effective reading area of the antennas of the gantry. This signal is transmitted to the controller that puts the reader to sleep 66. The reader 66 can then transmit to the PC 42 all the data recorded for validation and processing. However, when the wheelbase of the vehicle is such that the rear tires of the vehicle trigger the first detector barrier Dl before the front tires are triggered the third detector barrier D3, the controller retains the assignment from the reader 66 to the second antennas A2 until the effective tripping of the third detector barrier D3. This allows a complete reading of the front tires of the vehicle. As soon as the third detector barrier is triggered, the controller orders the switch 62 to activate the first antennas A1. [0049] It may also happen that the front tires of a second vehicle trigger the first detector barrier D1 before that the rear tires of the first vehicle did not trigger the third barrier D3 detectors. In this case, the controller acts as previously while maintaining the assignment of the reader 66 to the second antennas A2 until the tripping of the third detector barrier D3. To facilitate the allocation of data transmitted by the transponders, it is advantageous to add a transponder on the vehicle body, for example near the rear tire. The data of this transponder can also be read by the antennas A1 and A2. A system as previously described has been realized. This system consisted of an Impinj reader, set to a maximum of 30 dBm of driving power, of two linear Intermec antennas, spaced 1 m apart, oriented vertically, from three infrared detection cells Banner, with transmitter and receiver on the opposite side of the running track, two arranged 50 cm before their associated antenna and the third 50 cm after the second antenna, a Keon four-output controllable switch (three P10-3188 FR - 10 - used) and an electronic card made in the laboratory to control the switch constituted by a PIC microcontroller and inputs / outputs. The tires tested were equipped with SpeedyPatch supplied by Patch Rubber and UHF RFID transponders marketed by Hanna. The gantry and transponder data dynamic reading systems have been described in the particular case of competition vehicles, the gantry is then placed for example before the entry of the competition circuit or at the exit of the stands. Such a portal can be adapted to all types of vehicles and tires. P10-3188 EN
    权利要求:
    Claims (9)
    [0001]
    REVENDICATIONS1. Dynamic data reading system of a linear polarized antenna transponder of a tire of a vehicle in which the system comprises at least one antenna adapted to receive data transmitted by the transponder and at least one reader coupled to said antenna adapted to read and memorize the transponder data, characterized in that said antenna is a linear polarization antenna with a vertical electric field.
    [0002]
    2. Reading system according to claim 1, wherein the antenna has a gain of less than or equal to 6 dBi.
    [0003]
    The readout system of claim 2, wherein the system antenna is a gain antenna less than or equal to 6 dBi and the maximum driving power through the antenna is 30 dBm.
    [0004]
    4. Reading system according to any one of the preceding claims, comprising at least two linearly polarized antennas with a vertical electric field spaced apart from each other in the running direction of said tire by a distance of less than 20 1. , 20 m and preferably of the order of 1 m.
    [0005]
    5. Reading system according to claim 4, wherein said two antennas are disposed substantially at the height of the axis of rotation of said tire. 25
    [0006]
    6. Reading system according to one of claims 4 and 5, wherein said two antennas are driven alternately.
    [0007]
    7. Reading system according to one of claims 4 to 6, wherein said two antennas are connected to the same reader. 30 P10-3188 EN- 12 -
    [0008]
    8. Reading system according to any one of the preceding claims, wherein the transponder of said tire is a UHF RFID in which is registered a unique identification number of said tire.
    [0009]
    9. Portal for dynamic reading of vehicle tire transponder data disposed along a taxiway of said vehicles, characterized in that it comprises on either side of said taxiway a reading system according to the invention. any preceding claim. P10-3188 EN
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    法律状态:
    2015-11-19| PLFP| Fee payment|Year of fee payment: 3 |
    2016-11-18| PLFP| Fee payment|Year of fee payment: 4 |
    2017-11-21| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1361687A|FR3013907B1|2013-11-27|2013-11-27|SYSTEM FOR DYNAMIC READING OF TRANSPONDER DATA|FR1361687A| FR3013907B1|2013-11-27|2013-11-27|SYSTEM FOR DYNAMIC READING OF TRANSPONDER DATA|
    JP2016534997A| JP6615096B2|2013-11-27|2014-11-26|A system for dynamically reading data from transponders|
    PCT/EP2014/075666| WO2015078912A1|2013-11-27|2014-11-26|System for the dynamic reading of data from transponders|
    US15/039,985| US9754138B2|2013-11-27|2014-11-26|System for the dynamic reading of data from transponders|
    CN201480064916.1A| CN105765603B|2013-11-27|2014-11-26|System for reading data from transponder dynamic|
    EP14803120.6A| EP3074917A1|2013-11-27|2014-11-26|System for the dynamic reading of data from transponders|
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