RADIOFREQUENCY READING SYSTEM ON BOARD A MEANS OF TRANSPORT

Abstract

Transport means (2) equipped with a movable assembly (1) comprises a first part (12) set in motion about an axis of rotation (102) by a second assembly (11), the movable assembly (1) being equipped with a radiofrequency transponder (100) and a reading system (3) comprising: a generator coupled to a demodulator (31) of electrical signals; and a cable (32) galvanically connected to the generator (31), fixed to the transport means (2) and comprising a radiating part (342). The projection P onto a plane of the first part (12) located between two contiguous axes of rotation (11a, 11b) and/or the projection R onto a cylinder (104), of axis of revolution (102), circumscribing the first part (12) in contact with the second assembly (11) of the radiating part, is less than 1 meter.

Claims

1.-14. (canceled)

15. A transport means (2) equipped with at least one movable assembly (1) capable of ensuring relative movement of the transport means (2) with respect to another mechanical system, the at least one movable assembly (1) consisting of a deformable part (12) set in motion about at least one axis of rotation (102, 102a, 102b) by a non-deformable assembly (11a, 11b), free movement of the at least one movable assembly (1) taking place in a predominantly two-dimensional plane in a reference frame associated with the at least one movable assembly (1), the deformable part (12) of the at least one movable assembly (1) defining a median plane (101) which is perpendicular to the at least one axis of rotation (102, 102a, 102b), the at least one movable assembly (1) being equipped with a radiofrequency transponder (100, 100bis) comprising a radiofrequency transponder reading system (3), the radiofrequency transponder reading system (3) comprising: a generator of electrical signals (31) emitting at a frequency F0 included in an ultra-high frequency band, coupled to a demodulator (31) of electrical signals adapted to a frequency band around F0, mounted on the transport means (2); and at least one bidirectional communication cable (32) comprising a conductive core (314) covered with a dielectric material, the dielectric material being covered with a conductive assembly (316), being partly flexible, having one end (318) galvanically connected to the generator of electrical signals (31), the length lo of which is divided according to a metric of which a unit is a wavelength defined by the frequency F0, the at least one bidirectional communication cable (32) being fixed to the transport means (2) externally of the at least one movable assembly (1), comprising a radiating part (342), wherein a curvilinear abscissa of a first continuous part (32a-1, 32b-1) of the radiating part (342) of the at least one bidirectional communication cable (32) is at least greater than one unit of cable length, wherein a distance of an orthogonal projection P of the first continuous part (32a-1, 32b-1) of the radiating part of the at least one bidirectional communication cable (32) on a plane of the deformable part (12) located between two contiguous axes of rotation and collinear with the two contiguous axes of rotation and/or a distance of a radial projection R of the first continuous part (32a-1, 32b-1) of the radiating part of the at least one bidirectional communication cable (32) on a cylinder (104), of axis of revolution coaxial with the at least one axis of rotation (102, 102a, 102b) of the non-deformable assembly (11a, 11b), circumscribing the deformable part (12) in contact with the non-deformable assembly (11a, 11b), is less than or equal to 1 meter, and wherein a distance of an axial projection A, in a direction of the at least one axis of rotation (102, 102a, 102b), of the first continuous part (32a-1, 32b-1) of the radiating part of the at least one bidirectional communication cable (32) on the median plane (101) of the deformable part (12) of the at least one movable assembly (1) is less than or equal to 2 meters.

16. The transport means according to claim 15, wherein the radiating part of the at least one bidirectional communication cable (32) comprises at least one second continuous part (32a-2, 32b-2) disjointed from the first continuous part (32a-1, 32b-1), a curvilinear abscissa of the at least one second continuous part (32a-2, 32b-2) is at least greater than one unit of cable length, a distance of an orthogonal projection P of the at least one second continuous part (32a-2, 32b-2) of the radiating part of the at least one bidirectional communication cable on a plane of the deformable part (12) of a second movable assembly located between two contiguous axes of rotation (102a, 102b) and collinear with the two contiguous axes of rotation (102a, 102b) and/or a distance of a radial projection R of the at least one second continuous part (32a-2, 32b-2) of the radiating part of the at least one bidirectional communication cable on a cylinder, of axis of revolution coaxial with the at least one axis of rotation (102, 102a, 102b) of the non-deformable assembly (11a, 11b) of the second movable assembly, circumscribing the deformable part (12) in contact with the non-deformable assembly (11a, 11b) of the second movable assembly, is less than or equal to 1 meter, and a distance of an axial projection A, in the direction of the at least one axis of rotation (102, 102a, 102b) of the second movable assembly, of the at least one second continuous part (32a-2, 32b-2) of the radiating part of the at least one bidirectional communication cable on the median plane (101) of the deformable part (12) of the second movable assembly is less than 2 meters.

17. The transport means according to claim 15, wherein the at least one bidirectional communication cable (32) is equipped at its free end (322) with a conductor (324) connected to the conductive core (314) and covered with a second dielectric material, the second dielectric material partly covered by the conductor assembly (316) of which the conductor (324) length is adapted to a frequency band of the radiofrequency transponder reading system (3) for capacitive coupling performance.

18. The transport means according to claim 17, wherein, in the radiating part (342) of the at least one bidirectional communication cable (32), the conductor assembly (316) is covered by a second conductor assembly which is connected to ground.

19. The transport means according to claim 16, wherein, a radiofrequency antenna of the radiofrequency transponder (100, 100bis) comprising at least one wire strand defining a first longitudinal axis, and the first (32a-1, 32b-1) and/or the at least one second (32a-2, 32b-2) continuous part of the radiating part of the at least one bidirectional communication cable (32) defining a median line, an angle formed by director vectors of the first longitudinal axis and the median line is less than 30 degrees over at least part of a closed path described by the at least one movable assembly (1).

20. The transport means according to claim 19, wherein the radiofrequency transponder is an RFID tag (100, 100bis).

21. The transport means according to claim 15, wherein the transport means (2) is included in a group comprising a tracked land vehicle, a land vehicle with deformable and elastic tires, and a conveyor belt.

22. The transport means according to claim 15, wherein the deformable part (12) of the at least one movable assembly (1) is included in a group comprising a deformable and elastic tire, an elastomer mix conveyor belt and an elastomer mix caterpillar track.

23. The transport means according to claim 16, wherein the at least one movable assembly (1) describes a rotational movement about a single axis of rotation (102), and a continuous part of the at least one bidirectional communication cable describes an angular sector about the single axis of rotation (102) at least greater than 30 degrees.

24. The transport means according to claim 23, wherein the continuous part of the radiating part of the at least one bidirectional communication cable is fixed to at least one wall delimiting a cavity (21a-1, 21a-2, 21b-1, 21b-2) of the transport means (2) receiving the at least one movable assembly.

25. The transport means according to claim 23, wherein the first (32a-1, 32B-1) and/or the second (32a-2, 32b-2) continuous part of the radiating part of the at least one bidirectional communication cable extends at a constant radial distance from the single axis of rotation (102) of the at least one movable assembly.

26. The transport means according to claim 15, wherein the radiofrequency transponder (100, 100bis) transmits at a sub-carrier frequency.

27. The transport means according to claim 26, wherein the sub-carrier frequency of the radiofrequency transponder comprises a number of transitions of less than 5 over a unit period of the sub-carrier frequency.

28. The transport means according to claim 26, wherein the sub-carrier frequency of the radiofrequency transponder has a unit period of less than 10 ?s.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The invention will be better understood upon reading the following description, given solely by way of non-limiting example and with reference to the appended figures, throughout which the same reference numerals denote identical parts, and in which:

[0045] FIGS. 1a and 1b show a perspective view of the communication space of the radiating part of the communication cable with the movable assembly, according to two movable assembly applications.

[0046] FIG. 2 shows a method for implementing the bidirectional communication cable of the reading system according to the invention.

[0047] FIG. 3 shows a perspective view of how the reading system is installed in a motor vehicle.

[0048] FIG. 4 shows a view in cross section of a tyre inserted equipped with an RFID tag.

DETAILED DESCRIPTION OF EMBODIMENTS

[0049] FIG. 1a shows a tyre casing 12 representing the deformable part of a movable assembly consisting of said tyre casing mounted on a rim, the rim not being shown here. The tyre casing or deformable part 12 rotates about a natural axis of rotation 102. The deformable part 12 defines a median plane 101 which is perpendicular to the axis of rotation 102, separating the deformable part 12 into two sub-parts symmetrical with respect to the median plane 101. This deformable part 12 is equipped with an RFID-type radiofrequency transponder, i.e. without its own energy source, used to measure the inflation pressure of the movable assembly using a pressure sensor, which corresponds to an RFID sensor-type electronic device. This deformable part 12 also includes an active TPMS-type sensor mounted on the rim valve. The radial, azimuthal and axial positions of these radiofrequency devices are generally arbitrary in the movable assembly.

[0050] The deformable part 12 is circumscribed in a cylinder 108 with axis of revolution 102, resting on the radially outermost position of the crown of the tyre casing in relation to the axis of rotation 102. Here, the deformable part is inflated but not statically loaded, and the cylinder 108 rests on a multitude of points on the crown, evenly distributed around the perimeter of the crown.

[0051] The installation space 104 of the continuous part of the radiating part of the bidirectional communication cable can then be defined as a cylinder with an axis of revolution coaxial with the axis 102, extending radially with respect to the axis 102 from the outer surface of the cylinder 108 at a distance R materialized by the grey arrow represented in the median plane 101. This cylinder 104 is straight since it is limited by plane faces collinear to the median plane 101 located on either side of the median plane 101 at an axial distance A from the median plane 101 in the direction of the axis 102. These axial distances A are visualized by grey arrows carried by the axis 102. It is imperative to position a continuous part of the radiating part of the directional communication cable with a length of at least one unit of cable length, defined by the transmission frequency F0 of the reading system, in the straight cylinder 104 so that the radiofrequency devices of the movable assembly can communicate with the reading system installed on the transport means using said bidirectional communication cable.

[0052] FIG. 1b shows a conveyor belt 1 as a movable assembly, comprising a conveyor belt 12, representing the deformable part of the movable assembly, set in motion by two drive rollers 11a and 11b serving as the non-deformable part of the movable assembly. These drive rollers 11a and 11b are driven by a thermal propulsion system, not shown in the figure, of the transport means.

[0053] The conveyor belt or deformable part 12 rotates about two natural axes of rotation 102a and 102b. The deformable part 12 defines a median plane 101 which is perpendicular to the axes of rotation 102a and 102b, separating the deformable part 12 into two sub-parts symmetrical with respect to the median plane 101. This deformable part 12 is equipped with an RFID-type radiofrequency transponder, i.e. without its own energy source, used to identify the conveyor belt.

[0054] The deformable part 12 can be divided at any time into three zones. The first zone corresponds to the rotation of the conveyor belt about the axis of rotation 102a by means of the drive roller 11a, and is shown in the figure as a semicircle. The second zone corresponds to the rotation of the conveyor belt about the second axis of rotation 102b by means of the second drive roller 11b. Lastly, the third zone corresponds to the remainder of conveyor belt 12, where the movement of the conveyor belt 12 in this zone corresponds to a translational movement in a direction perpendicular to the axes of rotation 102a and 102b. The first zone is circumscribed by a half-cylinder 103a with axis of revolution 102a, resting on the radially outermost position of the conveyor belt 12 in the first zone relative to the axis of rotation 102a. By its very nature, this cylinder extends infinitely in the direction of the axis of rotation 102a. The second zone is similarly circumscribed by a half-cylinder 103b with axis of revolution 102b, resting on the radially outermost position of the conveyor belt 12 of the second zone relative to the axis of rotation 102b.

[0055] The installation space 104 of the continuous part of the radiating part of the bidirectional communication cable can then be defined as the geometric shape made up of several elementary geometric shapes.

[0056] Firstly, and in the case of FIG. 1b, for the second zone of the conveyor belt 12, the elementary shape is a half-cylinder with an axis of revolution coaxial with the axis 102b, extending radially with respect to the axis 102b from the outer surface of half-cylinder 103b to a distance R which is materialized by the difference of the grey arrows R2 and R1 represented in the median plane 101. This first half-cylinder is straight, since it is limited by plane faces collinear to the median plane 101 located on either side of the median plane 101 at an axial distance A from the median plane 101 in the direction of the axis 102b. These axial distances A are visualized by grey arrows collinear to the axis 102b. In a similar way, for the first zone of the conveyor belt 12, the elementary shape is also a half-cylinder with an axis of revolution coaxial with the axis 102a, extending radially with respect to the axis 102a from the outer surface of the half-cylinder 103a at the same distance R as the first half-cylinder. Here, the rollers 11a and 11b have identical radii, noted R1, but in general they can be different. However, the radial distance R from the outer surface of the conveyor belt 12 is always identical between the half-cylinders.

[0057] In the general case, the first and second zones are cylinder portions which are inversely proportional to the number of axes of rotation of the movable assembly 1. For example, if the movable assembly 1 has 3 axes of rotation of type 102, the cylinder portions correspond to thirds of a complete cylinder.

[0058] This second half-cylinder is straight, since it is limited by plane faces collinear to the median plane 101 located on either side of the median plane 101 at the same axial distance A from the median plane 101 in the direction of the axis 102a. In general, these are always portions of a straight cylinder, as they are delimited by plane faces collinear to the median plane 101.

[0059] Lastly, the third elementary form of the installation space 104 is a polyhedron, in the case of FIG. 1b a hexahedron, comprising two faces parallel to the median plane 101, each spaced by an axial distance A on either side of the median plane 101. The polyhedron is completed by the closing planes of the cylinder portions constructed from the radial distance R from the outer surface of the conveyor belt 12. In the case of FIG. 1b, as the axes of rotation of the movable assembly 1 are two in number, the closing planes are two in number and parallel to each other. However, whatever the number of closing planes, they are perpendicular to the median plane 101 and thus to the initial plane faces of the polyhedron. In the general case where the number of axes of rotation of the movable assembly 1 is greater than 2, each cylinder portion will delimit two closing planes forming an angle between them equal to the cylinder portion. For example, if the movable assembly comprises 3 axes of rotation, each third of a cylinder comprises two closing planes forming an angle of 120 degrees between them. Necessarily, each closing plane of a cylinder portion finds a closing plane parallel to it on a cylinder portion of an axis of rotation contiguous to the first axis of rotation. Lastly, the polyhedron is closed by a number of plane faces equal to the number of axes of rotation of the movable assembly 1 that are perpendicular to the median plane 101. Here, the movable assembly 1 of the conveyor has two axes of rotation, and the polyhedron, which is a hexahedron, is closed by two planes joining the free edges of the half-cylinders in pairs. These planes are parallel for the sole reason that the non-deformable assemblies 11a and 11b of the movable assembly 1 have identical radii.

[0060] Of course, the definition of the plane of installation 104 of the continuous part of the radiating part of a bidirectional communication cable is quite similar in the case of a tracked movable assembly with two or more drive wheels having collinear axes of rotation.

[0061] It is imperative to position a continuous part of the radiating part of the directional communication cable with a length of at least one unit of cable length, defined by the transmission frequency F0 of the reading system, in the polyhedron 104 so that the radiofrequency devices of the movable assembly 1 can communicate with the reading system installed on the transport means.

[0062] FIG. 2 shows a bidirectional communication cable 32 in a different configuration to the leaky feed antenna, which works perfectly well, but not exclusively, for RFID tag applications.

[0063] The cable 32 comprises an elongate bipolar coaxial conductor structure 312 with an electrically conductive inner conductor 314 and an electrically conductive sheath conductor 316 coaxially surrounding inner conductor 314. In the illustrated example, the inner conductor 314 is cylindrical and the sheath conductor 316 is hollow and cylindrical.

[0064] Both the inner conductor 314 and the sheath conductor 316 are made of a metallic material, wherein an electrically insulating intermediate layer (e.g. plastic) is advantageously present radially between the inner conductor 314 and the sheath conductor 316 over the entire length of the conductive structure 312.

[0065] A first end 318 of the conductive structure 312 is provided for connecting a transmitter and/or receiver of the reading system for an antenna signal to be transmitted using cable 32 or an antenna signal to be received by cable 32, respectively. The cable 32 is provided with a conventional coaxial plug 320 for this purpose in the illustrated example, which coaxial plug realizes an electrical connector for the inner conductor 314 and for the sheath conductor 316 at this first end 318 in a conventional manner.

[0066] An extension 324 of the inner conductor 314, which is integrally formed with the inner conductor 314 in the illustrated example and is therefore electrically connected to the inner conductor 314, is provided at a second, opposite end 322 of the conductor structure 312. This extension 424 extends away from the sheath conductor 316, starting from the second end 322 of the conductive structure 312, rectilinearly and coaxially to the path of the inner conductor 314 and the sheath conductor 316 directly before the second end 322.

[0067] The inner conductor extension 324 extends rectilinearly to a free end 326 of the inner conductor extension 324, wherein some capacitive coupling of the free end 326 or inner conductor extension 324 to the sheath conductor 316 exists in the region of the second end 322 thereof, depending on the length of the inner conductor extension 324.

[0068] In one transmission mode of the cable 32, i.e. if an antenna signal to be transmitted is introduced at the coaxial plug 320 of the first end 318, then this antenna signal travels through the conductive structure 312 to the end 322 and is reflected there to a greater or lesser extent, to flow back as a bound progressive wave emanating from the second end 322 along the sheath conductor 316 towards the first end 318.

[0069] For an operating mode chosen accordingly, for example with regard to the frequency and power of the injected antenna signal, it can be achieved that the cable 32 creates an alternating electromagnetic field around itself, but radiates relatively little. This cable 32 operates like a progressive-wave antenna in a coupled mode, so that the range of the cable 32 is well under control.

[0070] In the example shown in FIG. 2, a surface wave damping device 330 is arranged on the outer circumference of the sheath conductor 316, at a distance from the second end 322, at a point between the two ends 318 and 322. In the example shown, this device is formed by a plurality of ferrite rings 332, 334, 336 and 338, each of which surrounds the outer circumference of the sheath conductor 316.

[0071] The ferrite rings 332 to 338 are arranged at a distance from one another as seen in the longitudinal direction of the conductive structure 312, and advantageously damp said progressive waves, which rise from the second end 322 of the conductive structure 312, when these waves arrive at the location of the damping device 330.

[0072] The damping device 330 formed by the ferrite rings 332 to 338 or their arrangement location in the path of the coaxial conductor structure 312 divides the total length of the conductor structure 312 into a signal-conducting section 340 and a radiating section 342, wherein, during operation of the cable 32, the section 340 is used to conduct the antenna signal emanating from or towards the first end 318, and the section 342 is used to transmit information and/or power emanating from the cable 32 or towards the cable 32.

[0073] The number of ferrite rings and the individual distances between the ferrite rings can be adapted to the respective application or to the operating parameters of the cable 32.

[0074] It can also be provided that at least one ferrite ring, in the case of a plurality of ferrite rings, preferably at least the first ferrite ring closest to the second end 322, i.e. ferrite ring 332 in the illustrated example, is arranged so that it can move along the conductive structure 312.

[0075] As a result, the properties of the damping device thus formed can be influenced or adapted to the actual application.

[0076] Alternatively or in addition to the ferrite rings 332 to 338, the damping device 330 can, in deviation from the illustrated example, also comprise various damping components, such as an electrical network structure consisting of capacitive components and/or inductive and/or resistive elements, which is arranged at a relevant point along the path of the conductor structure 312 and connected on both sides to the sections 340, 342 of the conductor structure 312 leading to the first end 318 and the second end 322.

[0077] A main cable component 32 is formed by the coaxial conductive structure 312, which may be a flexible or semi-rigid cable, or a rigid structure, which has an open end or the aforementioned inner conductor extension 324.

[0078] In the area of the inner conductor extension 324, a sheath conductor 316 forming a shield is removed to some extent in the remaining area of the conductor structure, so that a dipole antenna is created, one arm of which is formed by the inner conductor extension 324 and the other arm of which is formed by the sheath conductor 316. There are other ways of implementing capacitive coupling which are not presented here.

[0079] The surface wave damping device 330 formed here by one or more ferrite rings limits the effective antenna length for transmission/reception for the section 342.

[0080] In addition to adjusting this antenna length, the position of the damping device 330, in this case the position of the first ferrite ring 332 in particular, also influences the properties of the damping device 330 and therefore the properties of the returning progressive waves.

[0081] It is generally advantageous with regard to the desired generation of returning progressive waves if the inner conductor extension 324 has a length which, at least approximately, represents a quarter wavelength of the antenna signal concerned.

[0082] For a suitable geometry of the cable 32 and corresponding operating mode, it can be achieved that the majority of an emission signal migrates along the signal transmitter/receiver section 342 as sheath current, and comparatively little high-frequency energy is radiated (coupled mode).

[0083] The length of the inner conductor extension 324 can be chosen in such a way that a desired impedance is defined in combination with the position of the first ferrite ring 332 to achieve as high a reflection loss of the cable 32 as possible.

[0084] The length of the cable 32 and the lengths of its aforesaid individual sections can be adapted to suit the application in question.

[0085] In summary, the structure, functionality and advantages of the cable 32 can be described as follows: [0086] A main cable component 32 is formed by the coaxial conductive structure 312, which may be a flexible or semi-rigid cable, or a rigid structure, which has an open end or the aforementioned inner conductor extension 324. [0087] In the area of the inner conductor extension 324, a sheath conductor 316 forming a shield is removed to some extent in the remaining area of the conductor structure, so that a dipole antenna is created, one arm of which is formed by the inner conductor extension 324 and the other arm of which is formed by the sheath conductor 316. [0088] The surface wave damping device 330 formed here by one or more ferrite rings limits the effective antenna length for transmission/reception for the section 342. [0089] In addition to adjusting this antenna length, the position of the damping device 330, in this case the position of the first ferrite ring 332 in particular, also influences the properties of the damping device 330 and therefore the properties of the returning progressive waves. [0090] It is necessary for the desired generation of returning progressive waves if the inner conductor extension 324 has a length which, at least approximately, represents a quarter wavelength of the antenna signal concerned. [0091] For a suitable geometry of the cable 32 and corresponding operating mode, it can be achieved that the majority of an emission signal migrates along the signal transmitter/receiver section 342 as sheath current, and comparatively little high-frequency energy is radiated (coupled mode). [0092] The length of the inner conductor extension 324 can be chosen in such a way that a desired impedance is defined in combination with the position of the first ferrite ring 332 to achieve as high a reflection loss of the cable 32 as possible.

[0093] Here, l1 is the length of the signal conductor section 340, l2 is the length of the surface wave damping device 330, l3 is the length of the signal transmitter/receiver section 342 and l4 is the length of the inner conductor extension.

[0094] The distance d1 refers to the distance between the ferrite rings 332 and 334. This distance d1 is, for example, between 5 and 20 mm.

[0095] The sheath conductor 316 of the coaxial conductor structure 312 has at least one opening, this opening is drawn in dotted lines as an example and marked by 339. The distance of the opening 339 from the damping device 330 is marked by d2 and lies in the range from 1 to 5 m. However, a plurality of openings 339 can also be arranged distributed along the length of the signal transmitter/receiver section 342 with a mutual spacing of between 0.1 and 5 times the signal wavelength.

[0096] FIG. 3 shows a perspective view of how the reading system 3 is installed in a transport means 2 such as a motor vehicle.

[0097] The motor vehicle 2 is represented here by a transparent volume representing the closed, equipped body, corresponding to the complete vehicle from which the axles and drive train have been removed. However, this vehicle 2 shows four cavities, 21a-1, 21a-2, 21b-1 and 21b-2, each designed to accommodate a mounted assembly of the vehicle. The mounted assembly comprises RFID tags and TMS sensors in the tyre casing.

[0098] This vehicle 2 also includes the reading system 3 enabling communication with the radiofrequency devices of the mounted assemblies. This reading system 3 comprises a first device for transmitting and reading electrical signals 31, located in the vehicle 2 at the apron, which is a wall that is mainly vertical with respect to the ground where the vehicle travels, delimiting the engine compartment of the vehicle located here at the front of the vehicle 2 from the passenger compartment. This device 31 therefore comprises both the electrical signal transmitter and the electrical signal demodulator.

[0099] From this device 31, two bidirectional communication cables 32a and 32b run to the left and right sides of the vehicle 2 respectively. These communication cables are progressive-wave cables as shown in FIG. 2, and are mounted on the device 31 to form a galvanic connection. Each cable 32a, 32b runs through the structure of the vehicle 2 to reach the vicinity of at least one cavity receiving mounted assemblies. Each cable has a signal transmission part which starts at the device 31 and then becomes radiating.

[0100] In fact, as illustrated in FIG. 3, each cable 32a, 32b reaches the proximity of two cavities for receiving mounted assemblies each corresponding to the front and rear axles of vehicle 2. At the first cavity 21a-1, the cable 32a has a continuous part 32a-1 which is located at the level of the wheel arch, describing an angular sector around the axis of the front axle of 120 degrees. This part 32a-1 of the communication cable 32a is located in the communication zone of the radiofrequency devices of the mounted assembly to be accommodated in the cavity 21a-1. Thus, this part of the communication cable 32a will communicate with the radiofrequency devices of the mounted assembly present in the receiving cavity 21a-1.

[0101] However, the same cable 32a then extends towards the second receiving cavity 21a-2 located on the left side of the vehicle 2 at the level of the rear axle. At this cavity 21a-2, the cable 32a has a continuous radiating second part 32a-2 located in the communication zone of the radiofrequency devices of the mounted assembly to be accommodated in the cavity 21a-2. The second continuous radiating part 32a-2 extends angularly around the axis of rotation of the rear axle over an angular sector of 90 degrees. The rear axle is not directional here, so the assembly moves very little angularly during the driving phase. Consequently, radiofrequency communication between the continuous and radiating part 32a-2 of the bidirectional communication cable 32a is facilitated compared with that of part 32a-1 where the axle is directional, generating angular movement of the mounted assembly when cornering, for example. These two continuous and radiating parts, 32a-1 and 32a-2 are separate and can only communicate with each other. However, in the case of a twin-wheeled axle, as in the case of a commercial vehicle in traction mode, the continuous part 32a-2 located close to the cavity 21a-2 would enable communication with the various twin-mounted assemblies located on the same axle and on the same side of vehicle 2.

[0102] Similarly, because of the symmetry of the motor vehicle 2, the communication cable 32b comprises a radiating part with two separate continuous parts, each communicating with a mounted assembly located on the front and rear axles respectively. The total length of the bidirectional communication cable 32a and 32b does not exceed 5 meters. The length of the continuous radiating part 32a-1, 32a-2, 32b-1 and 32b-2 is greater than 50 centimetres, corresponding to a quarter of the development of a passenger car tyre casing. This length exceeds the cable length unit for UHF radiofrequency communication at 920 MHz or 2.4 GHz.

[0103] FIG. 4 shows a detailed view of a tyre casing which forms the deformable part 12 of a movable assembly 1, which is represented by the mounted assembly formed of a tyre casing in an inflated state mounted on a rim. The rim represents the non-deformable part of the movable assembly. The diagram focuses on the bead 84 of the tyre casing. This figure illustrates the position of the RFID tag-type radiofrequency transponder 100 in the outer zone of the tyre casing with respect to the carcass ply 87.

[0104] The bead 84 consists of the bead wire 85, around which the carcass ply 87 is wound, with a folded part 88 situated in the outer zone of the tyre casing. The folded part 88 of the carcass ply 87 ends with a free edge 881. A rubber mass 91, called bead wire filler, is situated radially externally and adjacent to the bead wire 85. It has a radially outer free edge 911 bearing on a face of the carcass ply 87 (more precisely on the outer calendering of the carcass ply, there is no direct contact between the cords of the carcass ply and the radiofrequency transponder 100). A second rubber mass 92, called reinforcing filler, is adjacent thereto. It has two free edges. The first free edge 921 is situated radially internally and bears on the folded part 88 of the carcass ply. The other free edge 922 is situated radially externally and ends on the face of the carcass ply 87. Lastly, the sidewall 83 covers both the reinforcing filler 92 and the carcass ply 87. The sidewall has a free edge 831 situated radially internally and ending on the folded part 88 of the carcass ply.

[0105] The airtight inner liner 90, which is adjacent to the carcass ply 87 in this configuration, is located on the inner zone of the pneumatic tyre. It ends with a free edge 901 adjacent to the carcass ply 87. Lastly, a protective bead 93 protects the carcass ply 87 and the radially inner ends 901, 921 and 831 of the airtight inner liner 90, of the reinforcing filler rubber 92 and of the sidewall 83, respectively. The outer face of this protective bead 93 is able to be in direct contact with the rim flange when mounting the tyre casing on the wheel. This protective bead 93 has two radially outer free edges. The first free edge 931 is situated in the inner zone of the tyre casing 1. The second free edge 932 is situated in the outer zone of the tyre casing 1.

[0106] The bead 84 of this tyre casing is equipped with two RFID tags 100 and 100bis that are situated in the outer zone of the tyre casing. The first radiofrequency transponder 100, having been encapsulated beforehand in an electrically insulating encapsulating rubber, is positioned on the outer face of the bead wire filler 91. It is positioned at a distance of 20 millimetres from the free edge 881 of the folded part 88 of the carcass ply that constitutes a mechanical singularity. This position ensures a zone of mechanical stability for the electronic element 100 that is beneficial to the mechanical endurance thereof. In addition, embedding it within the structure of the mechanical casing gives it good protection against mechanical attacks coming from outside the tyre.

[0107] The second radiofrequency transponder 100bis, having been encapsulated beforehand in an electrically insulating encapsulating rubber compatible with or similar to the material of the sidewall 83, is positioned on the outer face of the sidewall. The material similarity between the sidewall 83 and the encapsulating rubber ensures that the radiofrequency transponder 100bis is installed inside and at the periphery of the sidewall 83 during the curing process. The RFID tag 100bis is simply placed on the uncured outer face on the sidewall 83 during the production of the tyre casing. Pressurizing the green body in the curing mould ensures the positioning of the RFID tag 100bis in the cured state, as shown. This RFID transponder 100bis is situated far from any free edge of a rubber component of the tyre casing. In particular, it is spaced from the free edge 932 of the protective bead, from the free edge 881 of the carcass ply and from the free edges 911 and 922 of the filler rubbers. Its position at the upper part of the bead ensures improved communication performance with an external radiofrequency reader.