WO2023007079A1 - Systeme de lecture radiofrequence embarque sur un moyen de transport - Google Patents
Systeme de lecture radiofrequence embarque sur un moyen de transport Download PDFInfo
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- WO2023007079A1 WO2023007079A1 PCT/FR2022/051481 FR2022051481W WO2023007079A1 WO 2023007079 A1 WO2023007079 A1 WO 2023007079A1 FR 2022051481 W FR2022051481 W FR 2022051481W WO 2023007079 A1 WO2023007079 A1 WO 2023007079A1
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- Prior art keywords
- cable
- assembly
- deformable
- rotation
- transport
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
- B60C23/0433—Radio signals
- B60C23/0435—Vehicle body mounted circuits, e.g. transceiver or antenna fixed to central console, door, roof, mirror or fender
- B60C23/0444—Antenna structures, control or arrangements thereof, e.g. for directional antennas, diversity antenna, antenna multiplexing or antennas integrated in fenders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
- B60C23/0433—Radio signals
- B60C23/0447—Wheel or tyre mounted circuits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
- B60C23/0433—Radio signals
- B60C23/0447—Wheel or tyre mounted circuits
- B60C23/0452—Antenna structure, control or arrangement
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2241—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in or for vehicle tyres
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
- H01Q1/3291—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted in or on other locations inside the vehicle or vehicle body
Definitions
- the present invention relates to a radiofrequency transponder reading system on board within a means of transport.
- the radiofrequency transponders are themselves linked to the mobile assemblies of the means of transport.
- radio frequency transponders operate in the UHF frequency range (acronym for Ultra High Frequencies).
- UHF frequency range an ultra High Frequencies
- connected objects are mobile components of these means of transport. Consequently, these are mobile in operation by traversing a plane movement around fixed axes of rotation with respect to the means of transport.
- the document US20210021015A1 shows, in the case of a land vehicle, the installation of an on-board reading system for RFID tags (acronym in English for RadioFrequency IDentification) and TMS sensors (acronym in English for Tire Mounted Sensor) located in the pneumatic envelopes of the mounted assemblies of the land vehicle.
- This system is composed of a radio frequency reader/transmitter galvanically connected to four transmission lines up to radio frequency antennas covering a certain geographical area.
- the radio frequency antennas are fixed solidly to the fixed part of the land vehicle.
- This solution requires multiplying radio frequency antennas which are generally two-dimensional and flat or even three-dimensional. This creates spatial clutter within the land vehicle which is detrimental to the installation of the other components of the land vehicle.
- the separation of the various elements multiplies the connection points between the various elements, which
- the circumferential S, axial A and radial R directions here mean directions defined with respect to the rotating marker of the movable assembly around its natural axis of rotation.
- the radial direction R is the direction running perpendicularly away from the natural axis of rotation.
- the axial direction A is the direction parallel to the natural axis of rotation.
- the circumferential direction S forms a direct trihedron with the predefined radial and axial directions.
- the invention relates to an arrangement of a means of transport and of a system for reading a radio frequency transponder, the means of transport being equipped with at least one mobile assembly able to ensure the movement relative of the means of transport with respect to another mechanical system, the mobile assembly consisting of a deformable part set in motion around at least one axis of rotation by a non-deformable assembly, the free movement of the at least one assembly movable taking place in a predominantly two-dimensional plane in a frame associated with the at least one movable assembly, the deformable part of the at least one movable assembly defining a median plane which is perpendicular to all of the at least one axis of rotation , the at least one mobile assembly, preferably the deformable part, being equipped with a radiofrequency transponder, the reading system comprises:
- An electrical signal generator emitting at a frequency L0 included in the Ultra High Frequency band, coupled to an electrical signal demodulator adapted to a frequency band around L0, mounted on the means of transport;
- At least one bidirectional communication cable comprising a conductive core covered with a dielectric material, itself covered with a conductive assembly, being partly flexible, having one end connected galvanically to the signal generator whose length lo is divided according to a metric whose unit is a wavelength defined by the frequency F0;
- the at least one cable being fixed integrally on the means of transport externally to the at least one mobile assembly, comprising a radiating part
- the arrangement is characterized in that the curvilinear abscissa of a first continuous part of the radiating part of the at least one cable is at least greater than one unit of length of the cable, in that the distance of the orthogonal projection P of the first continuous part of the radiating part of the at least one cable on a plane of the deformable part located between two contiguous axes of rotation and collinear with these two axes of rotation and/or the distance of the radial projection R of the first continuous part of the radiating part of the at least one cable on a cylinder, with an axis of revolution coaxial with the axis of rotation of the at least one of the non-deformable assemblies, circumscribed to the deformable part in contact with the at least one of the non-deformable assemblies deformable is less than or equal to 1 meter, preferably less than or equal to 0.5 meter and in that the distance of the axial projection A, in the direction of all of the at least one axis of rotation, from the first part co n
- free movement means that the movement is carried out without displacement constraint, such as a movement with imposed displacement.
- displacement constraint such as a movement with imposed displacement.
- contact area the area of contact of the pneumatic casing with the ground.
- the mobile assembly is the sub-assembly of the means of transport used to move the means of transport relative to another mechanical system.
- the mobile assembly comprises a deformable part driven in rotation around one or more axes of rotation by non-deformable parts, that is to say more rigid than the deformable part.
- This mobile assembly can be a mounted assembly of a motor vehicle comprising a pneumatic casing, constituting the deformable part, rotated around a single axis of rotation by the rim, constituting the non-deformable part with regard to the pneumatic casing .
- It can also be a tread made of rubbery materials and drive wheels, generally circular in shape, of the tread in the case of traction by caterpillar.
- Each drive wheel rotating around an axis of rotation can also be the conveyor belt of a conveyor, as the deformable part, and the drive rollers of the conveyor belt, at least two in number, which constitute the non-deformable part with regard to the conveyor belt.
- Each drive roller is driven in a rotational movement around an axis of rotation which is generally specific to it.
- the radio frequency transponder which can be an RFID tag or an active electronic device with its own energy source.
- the radiofrequency transponder is attached to the mobile assembly of the means of transport. This can be an RLID label in a tire casing, a TPMS sensor (Acronym for Tire Pressure Monitoring System) attached to the wheel or any electronic object communicating by radio frequency equipped with a radio frequency antenna located on a mobile assembly.
- TPMS sensor Acronym for Tire Pressure Monitoring System
- the invention discloses placing an on-board reading system on the means of transport outside the mobile assembly. As a result, it is not linked to the movement of the mobile assembly.
- This reading system comprises a first device comprising an electric signal transmitter at a fixed frequency and an electric signal demodulator on a frequency band around the
- This first device is connected to a two-way communication cable.
- This cable is composed of a conductive core, hollow or solid, generally metallic, and of a second conductive hollow tube coaxial with the conductive core. A dielectric material separates the two conductive components.
- One end of the cable is connected to the electronic transmission/reception device while the other end is free.
- This cable comprises at least one radiating part, that is to say that it functionally emits or receives radioelectric waves externally to the hollow conductive tube by various structural solutions.
- a possible cable is a leaky cable (in English "leaky feed antenna") whose outer hollow tube is provided in the radiating part with spatially distributed orifices with appropriate dimensions which are related to the wavelength of the radio waves emitted or received by the antenna cable. Outside the radiating areas, the coaxial cable serves as a waveguide.
- the invention is based first of all on the particular arrangement of the reading system and in particular of the radiating part of the two-way communication cable with respect to the path followed by the radiofrequency transponder driven in motion by the mobile assembly.
- the spatial distance between the radiating part of the cable and the radiofrequency transponder must be less than a certain distance, preferably one meter, during part of the loop describing the path of the mobile assembly. This is ensured through three conditions related to the structure of the mobile assembly.
- the moving assembly since the moving assembly has a predominantly two-dimensional movement, in the reference frame linked to the moving assembly, outside the zones with imposed displacement, it is possible to define a median plane at the deformable part of the moving assembly which has as a property of being perpendicular to all the axes of rotation of the mobile assembly and of separating the mobile assembly into two parts symmetrical with respect to the median plane.
- the term "mostly bidirectional movement” means that the distance traveled by a material point of the moving assembly between two instants, broken down on an orthonormal reference linked to the moving assembly, has a smaller component than the other two. Generally this component is that which is carried by the direction of the axes of rotation of the assembly
- the first condition is that a continuous sub-part of the radiating part of the communication cable is not more distant than 2 meters from the median plane attached to the deformable part of the mobile assembly in the direction of the axes of rotation of the assembly. mobile.
- the weaker the installation of the continuous part of the radiating part of the cable the better the radiofrequency communication between the two radiofrequency devices.
- the deformable part of the mobile assembly is either driven by a pure rotational movement around a single axis of rotation, which is the case for example of a mounted assembly for a motor vehicle, or driven by a movement combining partial rotations around several axes of rotation with translational movements between these partial rotations, which is the case of the conveyor belt of a conveyor or the tracks of a land vehicle for example. It is necessary to control the distance between the continuous part of the radiating part of the two-way communication cable and the deformable part of the mobile assembly. To this end, two projection conditions must be respected.
- the first concerning the area of the deformable part in partial rotation around an axis of rotation consists in defining the maximum radial projection distance R of the continuous part of the radiating part of the two-way communication cable on the nearest surface of the part deformable part of the mobile assembly driven by this rotational movement, therefore in contact with the non-deformable assembly of the mobile assembly.
- the second consists in defining the maximum orthogonal projection distance P of the continuous part of the radiating part of the two-way communication cable on the nearest surface of the deformable part of the mobile assembly. This surface is necessarily collinear with the axes of rotation of the mobile assembly delimiting the translational movement of the deformable part.
- 2021PAT00060WO communication is spatially periodic since it repeats itself with each loop. Of course, the more this part of the loop is extended, the better the communication between the two components. Preferably, the condition is complied with over the entire loop describing the route of the radio frequency transponder.
- the continuous part of the radiating part of the two-way communication cable which is located in this spatial zone with respect to the mobile assembly has a curvilinear length greater than one unit of length of the cable.
- the unit of cable length is defined by the wavelength associated with the frequency F0 of emission of the radioelectric signal by the reading system.
- the radiating part of the at least one cable comprising at least one second continuous part separate from the first continuous part, the curvilinear abscissa of the at least one second continuous part is at least greater than a unit of cable length, the distance of the orthogonal projection P of the at least one second continuous part of the radiating part of the at least one cable on a plane of the deformable part of the at least one second mobile assembly located between two axes of rotation contiguous and collinear with these two axes of rotation and/or the distance of the radial projection R of the at least one second continuous part of the radiating part of the at least one cable on a cylinder, of axis of revolution coaxial with the axis rotation of at least one of the non-deformable assemblies of the at least one second mobile assembly, circumscribed to the deformable part in contact with the at least one of the non-deformable assemblies of the at least one second assembly mobile ble is less than or equal to 1 meter, preferably less than 0.5 meter
- a cable on the median plane of the deformable part of the at least one second mobile assembly is less than 2 meters, preferably less than 1 meter, very preferably less than 0.5 meter.
- the same cable interrogates and receives the information from each radiofrequency transponder, each associated with a different mobile unit.
- To produce two strongly radiating spatial zones it suffices to pass the radiated part of the cable several times over the same spatial zone in order to create a continuous part.
- a strongly radiating zone is thus created allowing easy communication with the transponders of the means of transport passing through the spatial zone.
- the at least one cable is fitted at its free end with a conductor connected to the conductive core covered with a second dielectric material, itself covered in part by the conductive assembly, the length of the connector of which is matched to the frequency band of the playback system for capacitive coupling performance.
- This type of two-way communication cable uses surface radio waves through this reflection device.
- the communication functionality of the cable is not affected as could be a leaky cable ("leaky feed antenna") whose distribution and shapes of the holes passing through the conductive tube are more sensitive to the deformation of the bidirectional cable.
- this technical solution is more economical since making the holes on the conductive tube is much more expensive than installing an electrical reflection device by capacitive coupling at the end of a coaxial cable.
- This type of cable is described in patent application US2016/0197408A1 comprising at its free end an electrical reflection device by capacitive coupling consisting of a conductive component connected to the conductive core and possibly separated from the conductive tube by a second dielectric materials generating a capacitive coupling.
- the length of the conductive component is usually a quarter wavelength of the radio waves transmitted and received by the cable antenna.
- This device creates surface radio propagation waves on the conductive tube in the opposite direction to that emitted by the signal generator as far as a surface wave attenuation zone produced by magnetic rings, generally made of ferrite, mounted axially on the outside to the cable.
- the conductor assembly in the radiating part of the cable, is covered with a second conductor assembly which is grounded.
- the radiofrequency antenna of the radiofrequency transponder comprising at least one wired strand defining a first longitudinal axis, and the first and/or the at least one second continuous part of the radiating part of at least one cable defining a median straight line, the angle formed by the directing vectors of the first longitudinal axis and of the median straight line is less than 30 degrees, preferably less than 10 degrees over at least part of the closed path described by at least one mobile assembly.
- the two electronic assemblies are then provided with unidirectional antennas.
- the directions of the axes of the two antennas are not perpendicular to each other in order to ensure electromagnetic coupling between them.
- the two directions should be co-linear so that G coupling efficiency is maximum.
- the level of communication between the two antennas remains completely adequate as long as the angle formed by the two directions is less than 30 degrees.
- the radiofrequency transponder is passive, i.e. without its own source or production of electrical energy.
- the electromagnetic coupling is then used to activate the radiofrequency transponder by transmitting energy to it before it transmits.
- the radiofrequency transponder being in motion while the reading system is fixed relative to the means of transport, the angular condition is not necessarily respected over the entire route described by the radiofrequency transponder. However, it is sufficient that this is carried out on part of the course of
- the radio frequency transponder is an RFID tag (acronym for “Radio Frequency IDentification”).
- the means of transport is included in the group comprising a tracked land vehicle, a land vehicle with a deformable and elastic tire, a conveyor belt.
- the deformable part of the mobile assembly is included in the group comprising a deformable and elastic bandage, a conveyor belt made of an elastomeric mixture and a caterpillar made of an elastomeric mixture.
- RFID tag is the smallest radio frequency transponder to date providing at least an identification function of the object to which it is connected.
- These means of transport are often equipped with a conveyor belt, whether it is a tread, a conveyor belt or a pneumatic tire which represent wear parts on the scale of the means of transport. Identifying these removable parts whose aging is more accelerated than the means of transport allows predictive maintenance of the latter. Depending on the state of aging or wear of these components, it is sometimes necessary to adopt the settings of the means of transport to optimize operational efficiency.
- the mobile assembly describes a rotational movement around a single axis of rotation
- the continuous part of the at least one cable describes an angular sector around the single axis of rotation at the least greater than 30 degrees, preferably greater than 60 degrees, very preferably greater than 120 degrees.
- the first condition of the movement of the moving assembly illustrates, for example, the case of mounted assemblies for motor vehicles.
- the tire casing, mounted on a rim constitutes the mounted assembly which is rotated around a single axis of rotation.
- the continuous part of the radiating part of the two-way communication cable extends over an angular sector of at least 30 degrees.
- the continuous part of the radiating part of the at least one cable is fixed to the at least one wall delimiting the cavity of the means of transport accommodating the mobile assembly.
- the 2021PAT00060WO between the communication cable and the transponder is favored by the absence of mechanical components interposed between the two antennas.
- the cavity naturally constitutes a free zone for installing the communication cable in an extremely small space such as that of a motor vehicle.
- the continuous part of the radiating part of the at least one cable extends at a constant radial distance from the single axis of rotation of the mobile assembly.
- This condition ensures reliability in the radiofrequency communication between the two components in the case of a passive radiofrequency transponder, such as an RFID tag, in the pneumatic envelope. Indeed, it is commonly accepted to position the RFID tag at the level of the sidewall of the tire in a direction that is mainly circumferential with respect to the axis of rotation of the mounted assembly. In addition, the shape of the walls delimiting the reception cavity of the mounted assembly generally follows this geometric condition. Thus, also the communication between the two antennas is optimized both in terms of duration and quality.
- the radiofrequency transponder transmits via a sub-carrier frequency.
- the radio frequency transponder uses the radio frequency transmission signal that it receives to transmit the response to its interrogation.
- This mode of operation is particularly used in passive radio frequency transponders of the RFID tag type, i.e. those that do not have their own source of energy to transmit.
- These communication modes use various modulations depending on whether one wishes to promote the communication sensitivity of the two-way communication cable or the communication speed between the two radiofrequency devices.
- the modulation is characterized mainly by two quantities: the number of transitions for a binary state , physically it is a change of state of the impedance of the radiofrequency transponder of the electronic chip of an RFID tag for example, which induces a modification of the amplitude and the phase of the return signal, and the unit period to observe the
- the sub-carrier frequency of the radio frequency transponder comprises a number of transitions of less than 5, preferably a single transition over the unit period of the sub-carrier frequency.
- the sub-carrier frequency of the radio frequency transponder comprises a unit period of less than 10 ps, preferably less than 8 LIS.
- the radio frequency communication rate is favored between the radio frequency transponder and the two-way communication cable, that is to say the reading rate of the continuous part of the radiating part of the communication cable which is favorable in the context of the arrangement envisaged.
- the arrangement is characterized by reading distances between the two-way communication cable and the radiofrequency transponder of less than 1 meter over a short coupling period between the two devices due to the relative movement of the radiofrequency transponder mounted on the assembly. mobile.
- This mode of modulation is then better, in particular for tracked or pneumatic envelope transport vehicles when the continuous part of the radiating part of the communication cable is directly opposite the part deformable of the moving assembly.
- Figures la and lb show a perspective view of the communication space of the radiating part of the communication cable with the mobile assembly according to two mobile assembly application cases.
- Figure 2 shows an embodiment of the bidirectional communication cable of the reading system according to the invention.
- Figure 3 shows a perspective view of the installation of the reading system in a motor vehicle.
- Figure 4 shows a sectional view of a tire fitted with an RFID tag.
- a pneumatic casing 12 is displayed representing the deformable part of a mobile assembly consisting of said pneumatic casing mounted on a rim, the rim not being shown here.
- the pneumatic envelope or the deformable part 12 rotates around 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 symmetrical sub-parts relative to the median plane 101.
- This deformable part 12 is equipped with an RFID type radio frequency transponder, that is to say without a source of its own energy, used to measure the inflation pressure of the mobile assembly at the using a pressure sensor which corresponds to an electronic device of the RFID sensor type.
- This deformable part 12 also includes an active sensor of the TPMS type mounted on the valve of the rim. The radial, azimuthal and axial position
- 2021PAT00060WO of these radiofrequency devices are generally any in the mobile assembly.
- the deformable part 12 is circumscribed in a cylinder 108 with an axis of revolution 102 resting on the radially outermost position of the top of the tire casing with respect to the axis of rotation 102.
- the part deformable is inflated but not statically loaded, the cylinder 108 is based on a multitude of points of the top evenly distributed over the perimeter of the top.
- the installation space 104 of the continuous part of the radiating part of the two-way communication cable as being 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 gray arrow represented in the median plane 101.
- This cylinder 104 is straight since it is limited by flat faces collinear with the median plane 101 located on both sides other 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 gray arrows carried by the axis 102.
- Fig lb shows a conveyor belt conveyor 1, as a moving assembly, comprising a conveyor belt 12, representing the deformable part of the moving assembly, set in motion using two rollers.
- training 1 la and 1 lb serving as a non-deformable assembly of the mobile assembly.
- These drive rollers 11a and 11b are driven by thermal propulsion of the means of transport, not shown in the figure.
- the conveyor belt or the deformable part 12 rotates around two natural axes of rotation 102a and 102b.
- the deformable part 12 defines a median plane 101 which
- 2021PAT00060WO 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, that is to say without clean source of energy, used to identify the conveyor belt.
- the deformable part 12 can be cut at any time into three zones.
- the first zone corresponding to the rotation of the conveyor belt around the axis of rotation 102a using the drive roller l ia, this corresponds in the figure to a semicircle.
- the second zone corresponds to the rotation of the conveyor belt around the second ration axis 102b using the second drive roller 11b.
- the third zone corresponds to the rest of the conveyor belt 12 or 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 in a half-cylinder 103a with an axis of revolution 102a resting on the radially outermost position of the conveyor belt 12 of the first zone with respect to the axis of rotation 102a. extends in the direction of the axis of rotation 102a infinitely.
- the second zone is, in a similar way, circumscribed in a half-cylinder 103b of axis of revolution 102b based on the radially outermost position of the conveyor belt 12 of the second zone with respect to the axis of rotation 102b .
- the installation space 104 of the continuous part of the radiating part of the two-way communication cable as being the geometric shape made up of several elementary geometric shapes.
- the elementary shape is a semi-cylinder with an axis of revolution coaxial with the axis 102b, extending radially relative to the axis 102b from the outer surface of the half-cylinder 103b at a distance R which is materialized by the difference of the gray arrows R2 and RI represented in the median plane 101.
- This first half-cylinder is straight since it is limited by planar faces collinear with 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 gray collinear arrows
- the elementary shape is also a semi-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.
- the rollers 11a and 11b have identical radii, denoted RI, but, in general, they can be different.
- the radial distance R from the outer surface of the conveyor belt 12 is always identical between the half-cylinders.
- the first and second zones are cylinder portions which is inversely proportional to the number of axes of rotation of the mobile assembly 1. For example, if the mobile assembly 1 comprises 3 axes of rotation of type 102, the cylinder portions correspond to thirds of a complete cylinder.
- This second half-cylinder is straight since it is limited by co-linear planar faces 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 axis 102a. In general, they are always portions of a right cylinder because they are delimited by plane faces co-linear with the median plane 101.
- the third elementary shape of the implantation space 104 is a polyhedron, in the case of figure lb a hexahedron, comprising two faces parallel to the median plane 101 each spaced apart by an axial distance A located on either side and on the other 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 external surface of the conveyor belt 12.
- the closure planes are two in number and are parallel to each other. But whatever the number of closure planes, they are perpendicular to the median plane 101 and therefore to the initial flat faces of the polyhedron.
- each cylinder portion will delimit two closing planes forming an angle between them equal to the portion of the cylinder. For example, if the mobile assembly includes 3 axes of rotation, each third of a cylinder includes two closing planes forming an angle of 120 degrees between them. Necessarily, each closure plane of a cylinder portion
- 2021PAT00060WO finds a closure plane parallel to it on a cylinder portion of an axis of rotation contiguous to the first axis of rotation.
- the polyhedron is closed by a number of flat faces whose number is equal to the number of axes of rotation of the mobile assembly 1 which are perpendicular to the median plane 101.
- the mobile assembly 1 of the conveyor has two axes of rotations, the polyhedron, which is a hexahedron, is closed by two planes joining the free edges two by two of the half-cylinders. These planes are here parallel for the sole reason that the non-deformable assemblies 11a and 11b of the mobile assembly 1 have identical radii.
- the definition of the layout plan 104 of the continuous part of the radiating part of a two-way communication cable is quite similar in the case of a mobile assembly of the caterpillar type having two or more wheels. drive having co-linear axes of rotation
- Fig 2 shows a two-way communication cable 32 according to a different configuration of the leaky cable working perfectly well, but not only, for applications of the RFID tag type.
- the cable 32 comprises an elongated bipolar coaxial conductive structure 312 with an electrically conductive inner conductor 314 and an electrically conductive sheath conductor 316 coaxially surrounding the inner conductor 314.
- the inner conductor 314 is cylindrical and the conductor shell 316 is hollow and cylindrical.
- the inner conductor 314 like the jacket conductor 316 is formed from a metallic material, in which an electrically insulating intermediate layer (for example plastic) is advantageously present radially between the conductor
- a first end 318 of the conductive structure 312 is provided to connect a transmitter and/or a receiver of the reading system for an antenna signal to be transmitted using the cable 32 or an antenna signal to be received by the cable 32, respectively.
- the cable 32 is provided with a conventional coaxial plug 320 for this in the example shown, which coaxial plug provides an electrical connector for the inner conductor 314 and for the jacket conductor 316 at this first end 318 in a conventional manner.
- An extension 324 of inner conductor 314, which is formed integrally with inner conductor 314 in the example shown and is therefore electrically connected to inner conductor 314, is provided at a second opposite end 322 of the structure. conductor 312.
- This extension 424 extends out of the jacket conductor 316, starting from the second end 322 of the conductive structure 312, in a rectilinear manner and coaxial with the path of the inner conductor 314 and of the jacket conductor 316 directly before the second end 322 .
- Inner conductor extension 324 extends straight to a free end 326 of inner conductor extension 324, wherein some capacitive coupling of free end 326 or inner conductor 324 to sheath conductor 316 exists in the region of the second end 322 thereof, depending on the length of the inner conductor extension 324.
- this antenna signal travels the conductive structure 312 as far as end 322 and is reflected there more or less strongly, to flow back in the form of a linked progressive wave emanating from the second end 322 along the jacket conductor 316 in the direction of the first end 318.
- the cable 32 creates an alternating electromagnetic field around it, but radiates relatively little. This cable 32 works as a traveling wave antenna in a "coupled mode", so you have good control over the range of the cable 32.
- a surface wave damping device 330 is arranged on the outer circumference of the casing conductor 316, at a distance from the second end 322, at a point between the two ends 318 and 322.
- This device is formed, in the example illustrated, of a plurality of ferrite rings 332, 334, 336 and 338, which each time surround the outer circumference of the conductor envelope 316.
- the ferrite rings 332 to 338 are arranged at a distance from each other seen in the longitudinal direction of the conductive structure 312 and advantageously perform a damping of the traveling waves mentioned, which rise from the second end 322 of the structure. conductor 312, when these waves arrive at the location of the damping device 330.
- the snubber device 330 formed from the ferrite rings 332 to 338 or their arrangement location in the path of the coaxial conductive structure 312 divides the total length of the conductive structure 312 into a signal conductive section 340 and a radiating section 342, wherein during operation of cable 32, section 340 is used to conduct the antenna signal emanating from or to first end 318, and section 342 is used to transmit information and/or energy emanating from cable 32 or towards cable 32.
- the number of ferrite rings and the individual distances between the ferrite rings can be adapted to the respective use case or to the operating parameters of the cable 32.
- 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. the ferrite ring 332 in the example shown, is arranged such that it can move along the conductive structure 312.
- the damping device 330 can, in derogation from the example illustrated, also comprise various damping components, such as for example an electrical network structure consisting of capacitive components and/or inductive and/or resistive elements, which is arranged at a relevant point in the path of the conductive structure 312 and connected on both sides to the sections 340, 342 of the conductive structure 312 going to the first end 318 and to the second end 322.
- a main cable component 32 is formed by the coaxial conductive structure 312, which can be a flexible or semi-rigid cable, or even a rigid structure, which has an "open end" or the conductive extension internal 324 mentioned.
- a sheath conductor 316 forming a shield is removed to some extent in the remaining area of the conductive structure, so that a dipole antenna is created, one arm of which is formed by the inner conductor extension 324 and whose other branch is formed by the jacket conductor 316.
- the surface wave damping device 330 formed here by one or more ferrite rings limits the effective antenna length for transmission/reception at section 342.
- the position of the damping device 330 here 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 traveling waves. back.
- the length of the inner conductor extension 324 can be chosen such that a desired impedance is defined in combination with the position of the first ferrite ring 332 to obtain as high a return loss of the cable 32 as possible.
- the length of the cable 32 and the lengths of its individual sections mentioned can be provided such that they are adapted to the use case.
- a main cable component 32 is formed by the coaxial conductive structure 312, which can be a flexible or semi-rigid cable, or a rigid structure, which has an "open end" or the mentioned internal conductive extension 324.
- a sheath conductor 316 forming a shield is removed to some extent in the remaining area of the conductive structure, so that a dipole antenna is created, one arm of which is formed by the inner conductor extension 324 and whose other branch is formed by the sheath conductor 316.
- the surface wave dampener 330 formed here by one or more ferrite rings limits the effective antenna length for transmit/receive at section 342.
- the position of the damping device 330 here the position of the first ferrite ring 332 in particular,
- the inner conductor extension 324 has a length which is at least approximately a quarter wavelength of the antenna signal of interest.
- the length of the inner conductor extension 324 can be chosen such that a desired impedance is set in combination with the position of the first ferrite ring 332 to achieve as high a cable 32 return loss as possible.
- 11 is the length of the signal conductor section 340
- 12 is the length of the surface wave dampening device 330
- 13 is the length of the signal transmitter/receiver section 342
- 14 is the length of inner conductor extension.
- the distance d1 designates a distance between the ferrite rings 332 and 334. This distance d1 is for example between 5 and 20 mm.
- the envelope conductor 316 of the coaxial conductive structure 312 has at least one opening, this opening is drawn in dotted lines by way of example and identified by 339.
- the distance of the opening 339 from the damping device 330 is marked by d2 is in the range of 1 to 5 m.
- a plurality of apertures 339 may also be disposed distributed along the length of the signal transmitter/receiver section 342 with a mutual spacing between 0.1 and 5 times the signal wavelength.
- Fig 3 shows a perspective view of the installation of the reading system 3 in a means of transport 2 of the motor vehicle type.
- the motor vehicle 2 is represented here by a transparent volume representing the closed equipped dressed body, which corresponds to the complete vehicle from which the axles and the powertrain have been removed.
- four cavities denoted 21a-1, 21a-2, 2 lb-1 and 21b-2 can each accommodate a mounted assembly of the vehicle.
- the mounted assembly here comprises radiofrequency devices of the RFID tag and TMS sensor type at the level of the pneumatic casing.
- This vehicle 2 also includes the reading system 3 allowing communication with the radio frequency devices of the mounted assemblies.
- This reading system 3 comprises a first device 31 for transmitting and reading electrical signals installed in the vehicle 2 at the level of the apron, which is a wall which is mainly vertical with respect to the ground where the vehicle is moving, delimiting the engine compartment of the vehicle. located here at the front of vehicle 2 in the passenger compartment.
- This device 3& therefore comprises the electrical signal transmitter but also the electrical signal demodulator.
- Each cable 32a, 32b runs through the structure of the vehicle 2 in order to reach the proximity of at least one reception cavity of the mounted assemblies.
- Each cable includes a signal transmission part from the device 31 then becomes radiant.
- each cable 32a, 32b reaches the proximity of two reception cavities of the mounted assemblies, each corresponding to the front axle and the rear axle of the vehicle 2.
- the cable 32a At the level of the first cavity 21a-1, the cable 32a has a continuous part 32a-1 which is continuous 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 radio frequency devices of the mounted assembly to be accommodated in the cavity 21a-
- the same cable 32a then extends in the direction of the second reception cavity 21a-2 located on the left side of the vehicle 2 at the level of the rear axle.
- the cable 32a has a second radiating continuous part 32a-2 located in the communication zone of the radiofrequency devices of the mounted assembly to be received in the cavity 21a-2.
- the second continuous and radiating part 32a-2 extends angularly around the axis of rotation due to the rear axle over an angular sector of 90 degrees. Indeed, the rear axle is not directional here, therefore the mounted assembly moves little angularly during the rolling phase.
- the radiofrequency communication between the continuous and radiating part 32a-2 of the two-way communication cable 32a is facilitated compared to that of the part 32a-1 where the axle is directional, generating an angular movement of the mounted assembly in bends.
- These two continuous and radiating parts 32a-l and 32a-2 are separate and only allow each to communicate with a mounted assembly.
- the continuous part 32a-2 located near the cavity 21a-2 would make it possible to communicate with the various twin mounted assemblies, located on the same axle and on the same side of the vehicle 2.
- the communication cable 32b comprises a radiating part having two separate continuous parts each communicating with a mounted assembly located respectively on the front axle and the rear axle.
- the total length of the two-way communication cable 32a and 32b does not exceed here the length of 5 meters.
- the length of the continuous and radiating part 32a-l, 32a-2, 32b-l and 32b-2 is greater than 50 centimeters, corresponding to a quarter of the development of a pneumatic envelope for a particular vehicle. This length is beyond the unit length of the cable for radiofrequency communication in UHL at 920 MHz or 2.4 GHz.
- the Lig 4 represents a detail view of a pneumatic envelope which constitutes the deformable part 12 of a mobile assembly 1 that represents the mounted assembly
- 2021PAT00060WO consisting of a pneumatic casing in an inflated mounted state on a rim.
- the rim represents the undeformable part of the mobile assembly.
- the diagram focuses on the level of the bead 84 of the tire casing. This figure illustrates the positioning of a radiofrequency transponder 100 of the RFID tag type in the outer zone of the tire casing with respect to the carcass ply 87.
- the bead 84 is made up of the bead wire 85 around which the carcass ply 87 wraps with a folded part 88 located in the outer zone of the tire casing.
- the folded part 88 of the carcass ply 87 ends in a free edge 881.
- a mass of rubber 91 called bead filler is located radially externally and adjacent to the bead wire 85. It has a radially external free edge 911 resting 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 radio frequency transponder 100).
- a second mass of rubber 92 called “reinforcement stuffing” is adjacent to it.
- the sidewall 83 covers both the reinforcement stuffing 92 and the carcass ply 87.
- the sidewall has a free edge 831 located radially internally and ending on the upturned part 88 of the carcass ply.
- the bead 84 of this tire casing is equipped with two RFID tags 100 and 100 bis located in the outer zone of the pneumatic casing.
- the first radiofrequency transponder 100 being previously encapsulated in an electrically insulating rubber coating is positioned on the outer face of the rod filler 91. It is positioned at a distance of 20 millimeters from the free edge 881 of the turned-over part 88 of the carcass constitutes a mechanical singularity. This positioning ensures a zone of mechanical stability for the electronic component 100 which is beneficial to its mechanical endurance.
- its embedding within the structure of the mechanical casing itself provides it with good protection against mechanical attack originating from outside the tire.
- the second radiofrequency transponder 100bis being previously encapsulated in an insulating rubber coating that is electrically compatible or similar with the material of the sidewall 83 is positioned on the outer face of the sidewall.
- the material similarity between the flank 83 and the coating rubber ensures placement within and at the periphery of the flank 83 of the 100bis RFID tag during the curing process.
- the 100bis RFID tag is simply placed on the raw outer face of the sidewall 83 during the manufacture of the pneumatic casing. Pressurizing the green blank in the baking mold ensures the positioning of the lOObis RFID tag in the baked state as shown.
- This 100bis RFID transponder is located far from any free edge of a rubbery constituent of the tire envelope.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202280051736.4A CN117715770A (zh) | 2021-07-30 | 2022-07-25 | 运输工具上的射频读取系统 |
KR1020247002959A KR20240036581A (ko) | 2021-07-30 | 2022-07-25 | 운송 수단에 내장된 무선 주파수 판독 시스템 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FRFR2108303 | 2021-07-30 | ||
FR2108303A FR3125765A1 (fr) | 2021-07-30 | 2021-07-30 | système de lecture radiofréquence embarqué sur un moyen de transport |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023007079A1 true WO2023007079A1 (fr) | 2023-02-02 |
Family
ID=81328221
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2022/051481 WO2023007079A1 (fr) | 2021-07-30 | 2022-07-25 | Systeme de lecture radiofrequence embarque sur un moyen de transport |
Country Status (4)
Country | Link |
---|---|
KR (1) | KR20240036581A (fr) |
CN (1) | CN117715770A (fr) |
FR (1) | FR3125765A1 (fr) |
WO (1) | WO2023007079A1 (fr) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19518806A1 (de) * | 1995-05-26 | 1996-11-28 | Duerrwaechter E Dr Doduco | Einrichtung an Fahrzeugen zum Überwachen des Luftdrucks in dessen Reifen |
EP1004461A2 (fr) * | 1998-11-27 | 2000-05-31 | Pacific Industrial Co., Ltd. | Récepteur de contrôleur de la pression des pneus |
WO2007127220A2 (fr) * | 2006-04-25 | 2007-11-08 | Bridgestone Firestone North American Tire, Llc | Article elastomere comprenant un systeme de microcapteurs et nanocapteurs sans fil |
US20160197408A1 (en) | 2013-09-26 | 2016-07-07 | Dieter Kilian | Antenna for short-range applications and use of an antenna of this type |
US20210021015A1 (en) | 2019-07-19 | 2021-01-21 | The Goodyear Tire & Rubber Company | Reader system for tire with an integrated rfid and tpms sensor |
-
2021
- 2021-07-30 FR FR2108303A patent/FR3125765A1/fr active Pending
-
2022
- 2022-07-25 WO PCT/FR2022/051481 patent/WO2023007079A1/fr active Application Filing
- 2022-07-25 KR KR1020247002959A patent/KR20240036581A/ko unknown
- 2022-07-25 CN CN202280051736.4A patent/CN117715770A/zh active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19518806A1 (de) * | 1995-05-26 | 1996-11-28 | Duerrwaechter E Dr Doduco | Einrichtung an Fahrzeugen zum Überwachen des Luftdrucks in dessen Reifen |
EP1004461A2 (fr) * | 1998-11-27 | 2000-05-31 | Pacific Industrial Co., Ltd. | Récepteur de contrôleur de la pression des pneus |
WO2007127220A2 (fr) * | 2006-04-25 | 2007-11-08 | Bridgestone Firestone North American Tire, Llc | Article elastomere comprenant un systeme de microcapteurs et nanocapteurs sans fil |
US20160197408A1 (en) | 2013-09-26 | 2016-07-07 | Dieter Kilian | Antenna for short-range applications and use of an antenna of this type |
US20210021015A1 (en) | 2019-07-19 | 2021-01-21 | The Goodyear Tire & Rubber Company | Reader system for tire with an integrated rfid and tpms sensor |
Also Published As
Publication number | Publication date |
---|---|
FR3125765A1 (fr) | 2023-02-03 |
KR20240036581A (ko) | 2024-03-20 |
CN117715770A (zh) | 2024-03-15 |
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