Tyre provided with an electronic system

Abstract

The invention relates to an arrangement of a tyre (100) provided with an attachment device (10) and an electronic member (1): - the device (10), comprising a base (11), a closed retaining wall (12) extending from the base (11) to a free edge (13) and defining an open space (20) having a cylindrical shape, the axis (21) of which is aligned with the radial direction (R) of the tyre (100), the device having an opening (17) bounded by the free edge (13); - the member (1) comprising a printed circuit (5) with a sensor (7) and a radio-frequency antenna (2), the circuit (5) being inserted into an encapsulation device (30) having a cylindrical shape about an axis (31), comprising a surface (33) that is open to the outside of the attachment device (10); - the surface (33) has a structural detail (34), and the retaining wall (12) has angularly equidistributed geometric details (40, 41), one of which differs from the others.

Description

DESCRIPTION TITLE: Pneumatics equipped with an electronic system Scope of the invention

[0001] The present invention relates to the field of electronic systems embedded in a mounted assembly, designed to communicate information to the vehicle via radio frequency. This information includes tire identifiers, measurements of parameters within the pressurized fluidic cavity of a mounted assembly delimited by at least one tire and one wheel, and tire deformation parameters. It particularly relates to the field of electronic systems positioned with a precise orientation on the tire. Indeed, it is known that, to optimize radio frequency communication from an electronic system, it is sometimes necessary to orient the electronic component within the tire, especially for directional antennas. Technological background

[0002] In the transportation sector, vehicles are often legally required to monitor the inflation pressure of tires and other mounted components when these components are pressurized by a fluid at a pressure higher than atmospheric pressure. This is necessary to ensure proper tire performance and, consequently, vehicle performance, thus guaranteeing the safety of vehicle passengers and other road users. Electronic systems mounted on the wheel rim are frequently subjected to temperature spikes due to their proximity to components that can experience significant temperature increases, such as brake system components like brake discs, brake shoes, or brake drums. These temperature variations also affect the accuracy of measurements of the physical parameters within the fluidic cavity of the tire and other mounted components. Therefore, it is necessary to position the electronic system away from these hot components.Once positioned on the tire, the electronic system can record tire deformations, allowing for the retrieval of other tire usage parameters such as the number of rotations or the applied static load. Furthermore, this is done to avoid stressing the tire. The design of the electronic system requires, firstly, an angular orientation for measuring tire deformation along a non-radial direction, and secondly, the orientation of the radio frequency antenna must also be optimized if the antenna is not omnidirectional, which is the case for most antennas. Furthermore, the orientation of the electronic system can potentially alter the measurement signals from the sensors within the electronic system.

[0003] The object of the following invention aims to propose a simple, efficient and economical technical solution to guarantee control of the angular positioning of the electronic system in the pneumatic system in order to guarantee all the functionalities of the electronic system, in particular radio frequency communication. Description of the invention

[0004] The invention relates to an arrangement of a tire equipped with a fastening device and an electronic tire control unit in which: • The tire having an axis of rotation, being delimited by an external surface radially outside and an internal surface radially inside the tire, and comprising a vertex intended to come into contact with the ground, two sidewalls located on either side of the vertex and extended by two ridges intended to come into contact with a wheel rim; • The tire being equipped with a fastening device, located on the inner surface of the tire, and capable of deforming, the fastening device (10) comprising a sole whose outer surface is in contact with the tire, and a closed retaining wall, said retaining wall extending from the sole to a free edge and defining with the sole an open volume, the volume being defined by an inner surface of the sole and by an inner surface of cylindrical and convex shape of the retaining wall whose axis is carried by a radial direction of the tire, perpendicular to the axis of rotation (201), said inner surface of the retaining wall having an opening delimited by the free edge of the retaining wall; • An electronic component comprising an electronic board including a printed circuit on which are fixed a power source, a microcontroller, a radio frequency antenna, the electronic board being inserted in an encapsulation device having the shape of a right cylinder with an axis normal to the printed circuit, the encapsulation device comprising a first surface intended to be arranged inside the fixing device and a second surface intended to be open to the outside of the fixing device; The arrangement is characterized in that the second surface of the encapsulation device has on its contour a structural detail of revolution around the axis of the encapsulation device and extending axially, in that the retaining wall of the fastening device has on its external surface geometric details, angularly equidistributed around the axis of the fastening device on an angular sector 9 of the retaining wall, in that at least one of the geometric details is arranged such that the line passing through at least one geometric detail and perpendicular to the axis of the retaining wall is parallel to the vector of the axial direction or to the vector of the circumferential direction of the cylindrical frame associated with the intersection of the axis of the retaining wall with the internal surface of the tire, said geometric detail defining the origin of the angular frame,in that each geometric detail and the midpoint between two adjacent geometric details are particular geometric points, and in that a radial line perpendicular to the axis of the encapsulation device passing through the structural detail of the second surface of the encapsulation device and a radial line perpendicular to the axis of the retaining wall passing through a particular geometric point of the external surface of the retaining wall are parallel.

[0005] The technical problem is solved firstly through the presence of a structural detail on the external surface of the electronic component, at the level of the encapsulation device, which is visible from inside the fluid cavity of the assembled unit. Furthermore, this structural detail is associated with geometric details of the mounting device, which are also visible from inside the fluid cavity of the assembled unit. In particular, these geometric details are angularly equidistant, which allows the midpoint between any two details to be defined as a specific geometric point. neighboring geometric features. Finally, the series of geometric details is evenly distributed on either side of a differentiated geometric detail that defines the angular origin of the coordinate system at the mounting device. Thus, the electronic component can be precisely positioned relative to the mounting device using its structural detail by aligning the structural detail with a specific geometric point on the mounting device. Locating the component relative to the differentiated geometric detail allows the angle formed between the electronic component and the mounting device to be determined. Finally, the azimuthal position of the electronic component relative to the rotating coordinate system of the tire is achieved by specifically positioning the mounting device within the tire using the differentiated geometric detail.

[0006] Angular accuracy is ensured, firstly, by the radial positioning of the structural detail on the electronic component and the radial positioning of the geometric details on the retaining wall. Secondly, it is also guaranteed by the geometric shape of these details, and in particular the thinness of their cross-section along the circumferential direction around the axis of the two components. Finally, the coaxiality of the axis of the electronic component and the axis of the mounting device is guaranteed by the axisymmetric behavior of the retaining wall under deformation during the insertion of the electronic component while the retaining wall of the mounting device undergoes homogeneous deformation.Of course, if the components have a specific geometry, such as a triangular cylinder for geometric components or a cone for structural components, allowing for greater precision in defining the positioning angle (here, via a vertex of the triangle or the apex of the cone), this is an advantage for angular positioning. However, an accuracy of 6 degrees is sufficient to fully utilize the electronic component's functionalities. Manufacturing the components using a simple molding process, whether for the mounting device or the encapsulation of the electronic component, makes the technical solution very cost-effective.

[0007] Preferably, the geometric details are elements projecting from the external surface of the retaining wall of the fastening device.

[0008] The geometric details must be visually observable from outside the fastening device. Due to the deformable, even highly, nature of the material, this may require careful attention. The deformable retaining wall, designed to ensure easy insertion and removal of the electronic component from the mounting device, requires a thin thickness, especially at the free edge, to tolerate significant deformation under low stress. With a thin retaining wall, it is limiting for the geometric details to be recessed elements, which would reduce the wall thickness at these recessed areas. Since the geometric details occupy less than half the total surface area of ​​the retaining wall at their location, it is preferable to project these details to preserve the deformability and thermomechanical endurance of the retaining wall, assuming the component is made of the same material.

[0009] Advantageously, one end of each geometric detail of the fastening device is part of the free edge of the retaining wall of the fastening device.

[0010] By starting the geometric detail from the free edge of the retaining wall, it is easier to position the structural detail of the electronic component encapsulation device relative to a geometric point on the retaining wall, either through visual continuity between the two details or by centering them. Furthermore, the free edge of the retaining wall, which is a fragile area due to its reduced thickness and exposure to external forces during the insertion or extraction of the electronic component from the mounting device, is thus reinforced by the geometric detail if this detail protrudes from the retaining wall.

[0011] Preferably, the angle X defined between two neighboring geometric details is at most 12 degrees.

[0012] If the angle formed by two adjacent geometric details is less than 12 degrees, then the angle formed between two adjacent geometric points is necessarily less than 6 degrees. However, an angle accuracy of less than 6 degrees allows the projections of this angle onto an orthonormal coordinate system to be determined to within 10%. Therefore, this level of accuracy allows for the correction of signals from measurement sensors that measure the movement of the electronic component within a given orthonormal coordinate system. With an accuracy of less than 10%, this allows for a high-quality measurement of the electronic component's movement in a plane parallel to its printed circuit board. Furthermore, knowing the initial angular position of the measuring sensor on the electronic board relative to the reference frame defined by the structural details of the electronic component's encapsulation eliminates all design constraints on the electronic board and, consequently, on the electronic component itself. This results in a compact, lightweight, and ultimately cost-effective electronic component.

[0013] According to a preferred embodiment, the geometric details are distributed regularly on either side of the geometric detail defining the origin of the angular frame over an angular sector 9 of at least 120 degrees, preferably over an angular sector 9 of at least 180 degrees, preferably over an angular sector 9 of 360 degrees.

[0014] This design of the geometric details allows the origin of the angular coordinate system to be centered on the total angular sector 9. Furthermore, with a total angular sector 9 of at least 120 degrees, numerous angular positions of the electronic component within the mounting device are covered. The angular positioning of the electronic component on a geometric point is possible by defining a straight line passing through the geometric point and the axis of the mounting device. This is generally achieved by the volume of the internal cavity of the mounting device, which is deformed when the electronic component is present in the cavity, thus ensuring self-centering of the electronic component within the mounting device. That is to say, the axis of the mounting device is made coaxial with the axis of the encapsulating device of the electronic component by mounting.Therefore, the visual alignment of the electronic component's structural details with the geometric points of the mounting device ensures their angular position relative to each other. The larger the angular sector (9), the greater the degrees of freedom in the electronic component's orientation within the mounting device. With an angular sector (9) of 369 degrees, it is possible to define an alignment line on the mounting device by taking two diametrically opposed geometric points, thus facilitating the component's angular positioning. electronics in the fixing device via this visually defined straight line.

[0015] Advantageously, the geometric detail defining the origin of the coordinate system has a specific cross-section compared to the cross-section of other geometric details.

[0016] In order to visually locate, via the human eye or an optical system, the origin of the angular reference of the fixation device, it is necessary to associate it with a differentiating visible geometry through its section for example.

[0017] Most advantageously, the specific section of the geometric detail defining the origin of the coordinate system differs in shape and / or dimension from the section of other geometric details.

[0018] Traditionally, the size or shape of the section are effective and inexpensive visible differentiating elements for this purpose.

[0019] According to a specific embodiment, the electronic board comprising at least one measuring sensor capable of measuring at least two physical parameters of the electronic component along two perpendicular directions contained in the plane of the printed circuit board, a first direction D having a constant angle y with respect to the vector perpendicular to Taxe of the encapsulation device and passing through the orthogonal projection of the structural detail onto the plane of the printed circuit board and the structural detail of the electronic component aligned with the geometric detail defining the origin of the angular frame of the fixing device, the physical parameters of the electronic component expressed in the direct orthonormal frame associated with the origin of the angular frame of the fixing device are derived from a transformation of the measurements of at least one measuring sensor by a rotation matrix of angle y.

[0020] If no specific rotation of the electronic element relative to the fixing device is performed, i.e. the structural detail of the electronic element is aligned with the geometric detail defining the origin of the angular frame of the fixing device, the signals of the measuring sensor must be transformed by a rotation matrix of angle y to express the motion observed by the sensor in the direct orthonormal frame of the fixing device.

[0021] According to a second specific embodiment, the electronic card comprising at least one measuring sensor capable of measuring at least two physical parameters of the electronic component along two perpendicular directions contained in the plane of the printed circuit board, a first direction D having a constant angle y with respect to the vector perpendicular to the axis of the encapsulation device and passing through the orthogonal projection of the structural detail onto the plane of the printed circuit board, the structural detail is positioned at an angle - y with respect to the geometric detail defining the origin of the angular reference frame of the fixing device.

[0022] In this specific embodiment, the electronic component is rotated by an angle opposite to the angle formed by the specific directions of the measuring sensor in the angular frame of the electronic component relative to the structural detail of the electronic component. Consequently, the output signals of the electronic component's sensor are directly those expressed in the direct orthonormal frame of the mounting device, without any correction needing to be applied to the output signals of the measuring sensor.

[0023] According to another particular embodiment, the radio frequency antenna of the electronic organ being directional and having a maximum gain along a vector G whose orthogonal projection onto the plane of the printed circuit board, having a first end and a second end on the plane, has a constant angle α with respect to the vector perpendicular to the axis of the encapsulation device and passing through the orthogonal projection of the structural detail onto the plane of the printed circuit board, the structural detail is positioned at an angle -α with respect to the geometric detail defining the origin of the angular frame of the fixing device.

[0024] Specifically, the physical parameters of the electronic organ expressed in the direct orthonormal frame associated with the origin of the angular frame of the fixing device are derived from a transformation of the measurements of at least one measurement sensor by a rotation matrix of angle -a.

[0025] If the radio frequency antenna is directional, a preferred antenna communication direction must be aligned with the angular origin of the mounting device. To do this, knowing the angle a Formed between this preferred communication direction and the direction defined by the structural detail of the electronic component, an opposite angle of the same magnitude must be applied to the electronic component during its installation in the mounting device. As a result, the preferred communication direction and the direction of the mounting device defined by its origin are aligned.

[0026] However, this affects the orientation of the sensor measuring the electronic component's motion parameters, which have also undergone this rotation by an angle -a. Therefore, the measurement signals from this sensor must be transformed using a transformation matrix that represents the rotation by an angle -a. This transformation may be added to the transformation associated with the rotation by an angle -y, which is linked to the angular position of the measurement sensor in the electronic component's frame of reference and whether or not this position is taken into account during the installation of the electronic component in the mounting device, depending on the embodiment considered.

[0027] According to a second particular embodiment, the radio frequency antenna of the electronic component being directional and having a maximum gain along a vector G whose orthogonal projection onto the printed circuit board plane, having a first end and a second end on the plane, has a constant angle α with respect to the vector perpendicular to the axis of the encapsulation device passing through the orthogonal projection of the structural detail onto the printed circuit board plane, the structural detail is positioned at an angle 90° - α with respect to the geometric detail defining the origin of the angular reference frame of the fixing device, α being expressed in degrees.

[0028] Specifically, the physical parameters of the electronic organ expressed in the direct orthonormal frame associated with the origin of the angular frame of the fixing device are derived from a transformation of the measurements of at least one measuring sensor by a rotation matrix of angle 90°-a.

[0029] If the radio frequency antenna is directional, a preferred antenna communication direction must be aligned, if necessary, with a specific direction of the mounting device's angular coordinate system—the direction perpendicular to the direction defined by the geometric detail that establishes the angular origin of the mounting device's coordinate system. To achieve this, the angle α formed between this direction is known. Given the preferred communication direction and the direction defined by the structural detail of the electronic component, a complementary angle must be applied to the electronic component during its installation in the mounting device so that the preferred communication direction is perpendicular to the direction defined by the angular origin of the mounting device's reference frame. Consequently, the preferred communication direction and the direction of the mounting device perpendicular to its origin are aligned.

[0030] However, this affects the orientation of the sensor measuring the electronic component's motion parameters, which have also undergone this rotation by an angle of 90°. Therefore, the measurement signals from this sensor must be transformed using a transformation matrix that accounts for the 90° rotation. This transformation may be added to the transformation associated with the rotation by angle -y, which is linked to the angular position of the measurement sensor in the electronic component's frame of reference and whether or not this position is taken into account during the electronic component's installation in the mounting device, depending on the embodiment considered.

[0031] According to a final particular embodiment, the radio frequency antenna of the electronic component being directional and having a maximum gain along a vector G whose orthogonal projection onto the printed circuit board plane, having a first end and a second end on the plane, has a constant angle α with respect to the vector perpendicular to the axis of the encapsulation device and passing through the orthogonal projection of the structural detail onto the printed circuit board plane, the structural detail is positioned at an angle P - α with respect to the geometric detail defining at the origin of the angular frame of the fixing device.

[0032] Specifically, the physical parameters of the electronic organ expressed in the direct orthonormal frame associated with the origin of the angular frame of the fixing device are derived from a transformation of the measurements of at least one measurement sensor by a rotation matrix of angle Pa.

[0033] If the radio frequency antenna is directional, a preferred communication direction of the antenna must possibly coincide with a direction of the angular reference frame of the mounting device, the one that forms an angle P with the direction defined by the geometric detail that establishes the angular origin of the mounting device's reference frame. Therefore, knowing the angle α formed between this preferred communication direction and the direction defined by the structural detail of the electronic component, an angle ΔP must be applied to the electronic component during its installation in the mounting device so that the preferred communication direction is correctly positioned relative to the tire's reference frame via the reference frame associated with the mounting device. Consequently, the preferred communication direction and the desired direction of the mounting device are aligned.

[0034] However, this affects the orientation of the sensor measuring the electronic component's motion parameters, which have also undergone this rotation by an angle Pa. Therefore, the measurement signals from this sensor must be transformed using a transformation matrix that represents the rotation by an angle Pa. This transformation may be added to the transformation associated with the rotation by angle -y, which is linked to the angular position of the measurement sensor in the electronic component's frame of reference and whether or not this position is taken into account during the installation of the electronic component in the mounting device, depending on the embodiment considered. Brief description of the drawings

[0035] The invention will be better understood upon reading the following description, given solely by way of non-limiting example and made with reference to the accompanying figures, in which the same reference numbers designate identical parts throughout and in which: • Fig. 1 shows a cross-section of a tire mounting device in perspective view of the state of the art. • Fig. 2 shows a cross-section of an example of an electronic component used in the perspective view arrangement according to the invention. • Fig. 3 shows a top view of a device for fixing the arrangement according to the invention; • Fig. 4 shows a top view of an example of an assembly of a fastening device and an electronic component of the arrangement according to the invention. • Fig. 5 presents the diagram representing the orientation of a radio frequency antenna in relation to the structural detail of an electronic component. • Fig. 6 presents a perspective view of a cross-section of an arrangement according to the invention. Detailed description of the implementation methods

[0036] Fig. 1 illustrates a state-of-the-art pneumatic mounting device 10. The mounting device 10 is shown in cross-section in perspective view.

[0037] The fastening device 10 is made of rubber so that it can deform elastically. The connection between the fastening device 10 and the tire is achieved by means of the sole 11, which is intended to be in contact with the inner surface of the tire using its outer surface, and by applying one of the various fastening techniques known to those skilled in the art for securely fastening rubber compounds together.

[0038] The device 10 also includes a retaining wall 12 extending perpendicularly to the sole 11 from the sole 11 to a free edge 13. The retaining wall 12 is closed and cylindrical about an axis 21. Here, the cylindrical shape of the retaining wall 12 is circular. The free edge 13 defines an opening 17 capable of deforming to allow the insertion or extraction of an electronic component within the fastening device 10. The electronic component is housed within a cavity 20 open to the external environment through the opening 17. This cavity 20 is delimited by the inner surface 15 of the sole 11 and the inner surface 16 of the retaining wall 12. The electronic component is intended to come into contact with the inner surface 15 of the sole 11 during the rolling of the tire due to the effect of centrifugal forces.Similarly, the elastic deformation of the retaining wall 12 ensures on the one hand the insertion and extraction of the electronic element from the volume 20, and on the other hand, in service, the retaining wall 12 comes to rest on the external surface of the electronic element in order to ensure the retention of the electronic element within the fixing device 10. The retaining wall 12 has an external surface 18 which is closed on itself.

[0039] Fig. 2 illustrates an electronic component 1 of the invention intended to be integrated into a tire fixing device whose volume corresponds to that of Figure 1.

[0040] This electronic component 1 consists here of an electronic board 6 and an encapsulation device 30 for the electronic board 6.

[0041] The electronic board 6 includes a printed circuit board 5 on which is mounted a power source 4, in this case a battery connected to the printed circuit board 5 by means of conductive arms. The conductive arms ensure that the battery 4 is held in place relative to the printed circuit board 5 and that the electrical particles from the battery are conducted to the printed circuit board, and in particular to its electronic components connected by conductive traces on the printed circuit board 5. The printed circuit board 5 is also electrically connected to a microcontroller 3, which constitutes the brain of the electronic component 1. The printed circuit board 5 also includes a radio frequency antenna enabling information communication between the electronic component 1 and external transmitting / receiving means.Here, the electronic component includes a sensor 7 for measuring a physical parameter of the electronic component's movement, such as a three-dimensional accelerometer, as well as a sensor for measuring a fluid physical parameter, such as a pressure sensor and / or a temperature sensor. Thus, the measuring sensor 7 measures the electronic component's movement both in a direction perpendicular to the printed circuit board 5 and in two mutually perpendicular directions within the plane of the printed circuit board 5. These sensors are fixed to the printed circuit board 5 and electrically connected to the microcontroller 3.

[0042] The encapsulation device 30 consists of a plastic coating that solidifies the electronic components of the circuit board 6 together. Other circuit board encapsulation device designs exist, such as the combination of two rigid housings, joined together at their free edges by standard bonding techniques. This encapsulation device 30 is delimited by an external surface 32 in the form of a right cylinder around an axis 31 that is perpendicular to the printed circuit board 5. The external surface 33 will be arranged so that it is open to the outside of the mounting device. It includes an orifice 35 that passes through the material to the active part of the sensor for measuring the fluid physical parameter in order to perform the measurement at the sensor. This external surface 33 of the encapsulation device 30, the most distal of the energy source 4, has a shoulder. On this shoulder is a recess 34 extending over the entire height of the shoulder, which represents a structural detail of the encapsulation device 30. This structural detail 34 of the encapsulation device 30 of the electronic component 1 serves as a reference point for the angular orientation of the various components of the electronic component 1, such as the radio frequency antenna or the sensor 7 for measuring a physical parameter of the movement of the electronic component 1.

[0043] Fig. 3 shows a top view of a fastening device 10 of the arrangement according to the invention.

[0044] The fastening device 10 has a series of concentric discs around the axis of rotation 21, which corresponds to a material point in this representation. The disc furthest radially from the axis of rotation 21 corresponds to the base 11 of the fastening device 10. The adjacent disc, shown in light gray, corresponds to the retaining wall 12 of the fastening device 10. On this second disc, a thin, imaginary line is visible, corresponding to the change in curvature of the retaining wall 12 between its predominantly vertical portion, oriented along the axis 21 and located radially externally to the axis 21, and its predominantly horizontal portion, located radially furthest internally and ending at the free edge 13. Being located outside the fastening device 10, this hollow, gray disc also represents the external surface 18 of the retaining wall 12 of the fastening device 10.Finally, the solid disc delimited by the free edge 3 corresponds both to the opening 17 allowing the insertion and / or extraction of the electronic component into the internal cavity of the fixing device 10 and also to a portion of the internal surface 15 of the base 11 delimiting the internal cavity. Here, the fixing device 10 can be delimited by a cylinder of revolution about the axis 21.

[0045] On the right-hand side of the external surface 18 of the retaining wall 12, a series of geometric details 40, 41 are visible, angularly equidistant at an angle X, here on the order of 12 degrees, over an angular sector 9 of approximately 180 degrees. This distribution of the geometric details 40, 41 allows us to define geometric points 43 which correspond either to the centroid of the geometric details or to the midpoint between two neighboring centroids. This allows for a distribution of 43 geometric points angularly equidistant at an angle of approximately 6 degrees. Thus, an electronic component can be angularly positioned within the mounting device 10 with an accuracy of approximately 6 degrees. This minimizes errors in the measurement signals from the electronic component's sensors to less than 10%, which is sufficient to obtain accurate signals with respect to specific directions (U, V) of the mounting device 10, or even specific directions (Ut, Y) of the tire. Here, the mounting device 10 is assumed to be positioned so that the axis 21 lies along a radial direction of the tire.

[0046] Of this series, one geometric detail 41 differs from the others due to its size relative to the other geometric details 40. This constitutes an angular reference point for the fastening device 10. This geometric detail 41 is parallel to the tangential direction Ut in the cylindrical coordinate system of the tire. All the geometric details 40 and 41 of this fastening device 10 are parallelepiped elements projecting from the external surface 18 of the retaining wall 12. This ensures that the thickness of the retaining wall 12 is predominantly minimal to prevent any initiation or propagation of cracks during deformation of the retaining wall during the insertion or extraction of the electronic component. If these geometric details 40 and 41 were recessed, this would impose an excess thickness on the retaining wall 12, which would be detrimental to the deformation of the retaining wall 12 if the material were the same.Functionally, these geometric details must be visible with a suitable shape to define a specific point, which will ensure angular accuracy.

[0047] Fig. 4 shows a top view of an example of an assembly of a fastening device and an electronic component of the arrangement according to the invention.

[0048] In this figure, the fastening device 10 is similar to the fastening device in Fig. 3 with the following differences.

[0049] Here, the number of geometric details 40, 41, although angularly equidistant at an angle X close to 12 degrees, is more substantial to cover a The total angular sector 9 is 360 degrees. Distributing the details over the entire retaining wall 12 allows for the geometric definition of a diameter that facilitates the visual orientation of the electronic component 1 relative to the mounting device 10. Furthermore, the geometric detail 41 defining the angular reference frame of the mounting device is oriented along the axis U of the mounting device 10. However, here, this direction U corresponds to the axial direction Y of the tire.

[0050] In this figure, the fluidic cavity of the fastening device 10 houses an electronic component 1, of which only the external surface 33 of the encapsulation device is visible. This external surface 33 has an orifice 35 that passes through the encapsulation device to a fluidic cavity connected to the active part of a fluid parameter measurement sensor, such as a pressure sensor and / or a pressure sensor.

[0051] The encapsulation device is circumscribed within a cylindrical axis 31 which is here coaxial with the axis 21 of the fixing device 10.

[0052] Finally, the external surface 33 has on its radial contour a structural detail 34 visible through the opening delimited by the free edge 13 of the retaining wall 12 of the fastening device 10. This structural detail 34 allows the electronic component 1 to be positioned angularly with respect to the angular reference frame of the fastening device 10 defined by the geometric detail 4L. In our case, the angle of rotation is Pa. This ensures that the direction of the vector G of the directional radio frequency antenna of the electronic component 1, defining an angle α with respect to the direction of the structural detail 34, makes either an angle P with respect to the vector U of the fastening device 10, or an angle P with respect to the axial direction Y of the tire.

[0053] Fig. 5 presents a three-dimensional view of the radiation pattern of a radio frequency antenna 2 of an example of an electronic component forming part of the arrangement according to the invention.

[0054] Radio frequency antenna 2 is directional here, meaning that the radiation pattern is predominantly oriented towards a specific spatial region relative to radio frequency antenna 2; that is, within this region, the Radio frequency communication is better in transmission / reception compared to the rest of the space surrounding the radio frequency antenna 2.

[0055] Here, we only visualize the main lobe, the most energetic one. This main lobe describes a three-dimensional spatial region in an orthonormal coordinate system. The convergence point of the main lobe is the radio frequency antenna 2. Within this main lobe, we identify the gain vector G, which corresponds to the maximum radio frequency transmission / reception amplitude of the main lobe.

[0056] An orthonormal coordinate system is defined, consisting of plane 50 of the printed circuit board 5 of the electronic component and the normal 31 to this plane 50. In this orthonormal coordinate system, the vector G is decomposed into two distinct projections. The first projection follows the normal 31 to plane 50 and is generally called the "elevation." The second projection is onto plane 50, which is simply the orthogonal projection of the vector G along the axis 31 of the encapsulation device of the electronic component onto plane 50. This projection defines a center 51 and an endpoint 52, which is the orthogonal projection of the endpoint of the vector G onto plane 50. The structural detail 34 of the encapsulation device is also projected onto plane 50 along the axis 31 of the encapsulation device, thus defining point 53 on plane 50.Here, the structural detail 34 protrudes from the second surface 33 of the electronic organ encapsulation device represented by its dotted outline.

[0057] Finally, we calculate the angle α described by the intersection of two lines d and d' in plane 50. Line d passes through the center 51 and the endpoint 52, while line d' passes through the intersection of axis 31 with plane 50 and point 53, which is the orthogonal projection of structural detail 34 onto plane 50. The orientation of angle α is evaluated in the trigonometric direction relative to the normal 31, which runs away from the plane of the printed circuit board 5 towards the second surface 33 of the electronic component, originating on plane 50. Here, the value of angle α is therefore negative.

[0058] Similarly, if the electronic component is equipped with a sensor measuring the physical parameter of its movement along a direction D contained in plane 50, this measurement direction D describes a straight line d'' in plane 50. The angle P defined by the lines d' and d'' is therefore the angle of rotation of direction D. measurement relative to the direction of the structural detail 34 with respect to the intersection of the axis 31 with the plane 50. The orientation of the angle P is evaluated in the trigonometric direction relative to the normal 31 moving away from the plane of the printed circuit 5 towards the second surface 33 of the electronic component taking its origin on the line d'.

[0059] Fig. 6 shows a cross-section of a tire 100 in perspective of the arrangement according to the invention, comprising a vertex S extended by two sidewalls F and terminating in two beadlets B. In this case, the tire 100 is intended to be mounted on a wheel, which is not shown in this figure, at the level of the two beadlets B. This defines a closed cavity, containing at least one pressurized fluid, delimited both by the radially inner surface 130 of the tire 100 and by the outer surface of the wheel. The tire 100 also includes a surface 140 radially external to the tire 100.

[0060] We will note the reference axis 201 corresponding to the reference axis or natural axis of rotation of the tire 100 and the median plane 211, perpendicular to the reference axis 201 and equidistant from the two bead B. The intersection of the reference axis 201 by the median plane 211 determines the center of the tire 200. We will define a Cartesian coordinate system at the center of the tire 200 consisting of the reference axis 201, a vertical axis 203 perpendicular to the ground and a longitudinal axis 202 perpendicular to the other two axes. And, we will define the axial plane 212 passing through the reference axis 201 and the longitudinal axis 202, parallel to the ground plane and perpendicular to the median plane 211. Finally, we will call the vertical plane 213 the plane perpendicular to both the median plane 211 and the axial plane 212 passing through the vertical axis 203.

[0061] Every material point of the tire 100 is uniquely defined by its cylindrical coordinates (Y, R, 9). The scalar Y represents the axial distance to the center of the tire 200 in the direction of the reference axis 201, defined by the orthogonal projection of the material point of the tire 100 onto the reference axis 201. A radial plane 214 is defined, making an angle 9 with the vertical plane 213 around the reference axis 201. The material point of the tire 100 is located in this radial plane 214 by the distance R to the center of the tire 200 in the direction perpendicular to the reference axis 201, identified by the orthogonal projection of this material point on the radial axis 204. The unit vector perpendicular to the radial plane 214 and forming a right trihedron with the unit vectors of the axial direction 201 and radial direction 204 represents the circumferential direction of the pneumatic envelope 100.

[0062] This tire 100 has a fastening device 10 on its radially inner surface 130. This device is attached to the surface 130 by bonding, using conventional techniques in the prior art, when the fastening device 10 is made of an elastomeric material. The fastening device 10 is fixed at the apex S of the tire casing 100, which improves its durability since the fastening device, thus positioned, causes fewer problems during the mounting or dismounting of the wheel from the tire casing 100. Indeed, the fastening device 10 is located in an area away from the bead B of the tire casing 100. Here, the fastening device 10 is equipped with an electronic component 1 positioned within its open volume, which provides a suitable housing for the electronic component. Therefore, the tire casing 100 is ready to be mounted on a wheel to form a complete assembly.The electronic component 1 can perform various functions, such as identifying certain components, including the electronic component itself and the tire. To orient the electronic component relative to the mounting device to account for the orientations of its components, the mounting device 10 must be positioned angularly with respect to the Frenet frame associated with the material point, which is the projection of the axis of the mounting device onto the inner surface 130 of the tire. The geometric detail with a specific cross-section, defining the angular origin of the mounting device 10, is positioned on the outer surface of the mounting device's retaining wall so that the line perpendicular to the axis of the mounting device 10 and passing through this geometric detail is parallel to the axis of rotation 201 of the tire 100, for example.

[0063] However, the electronic component 1 can also be equipped with a pressure and / or temperature sensor to assess the inflation pressure or the temperature of the fluidic cavity of the assembled unit. Finally, it can also be equipped with a sensor that directly measures the curvature of the tire, such as an accelerometer or a flexometer, allowing for the determination of tire operating parameters. such as angular velocity, mileage traveled, and applied static load. All or part of these quantities allow for the identification of the performance of the tire and therefore of the assembled vehicle, such as its wear, its grip, or intrinsic properties of the ground on which the vehicle travels.

Claims

DEMANDS 1. Arrangement of a tire (100) equipped with a fastening device (10) and an electronic device (1) for tire: - The tire (100) having an axis of rotation (201), being delimited by an external surface (140) radially external and an internal surface (130) radially internal, and comprising a vertex (S) intended to come into contact with a ground, two sidewalls (F) located on either side of the vertex (S) and extended by two ridges (B) intended to come into contact with a wheel rim; - The tire (100) being equipped with a fastening device (10), located on the inner surface (130) of the tire (100), and capable of deformation, the fastening device (10) comprising a base (11), the outer surface of which is in contact with the tire (100), and a closed retaining wall (12), said retaining wall (12) extending from the base (11) to a free edge (13) and defining with the base (11) an open volume (20), the volume (20) being defined by an inner surface (15) of the base (11) and by an inner surface (16) of cylindrical and convex shape of the retaining wall (12) the axis (21) of which is borne by a radial direction (R) of the tire (100), perpendicular to the axis of rotation (201), said inner surface (16) of the retaining wall (12) having an opening (17) delimited by the free edge (13) of the retaining wall (12); - An electronic component (1) comprising an electronic board (6) including a printed circuit board (5) on which are mounted a power source (4), a microcontroller (3), and a radio frequency antenna (2), the electronic board (6) being inserted into an encapsulation device (30) having the shape of a right cylinder with axis (31) normal to the printed circuit board (5), the encapsulation device (30) comprising a first surface (32) intended to be arranged inside the mounting device (10) and a second surface (33) intended to be open to the outside of the mounting device (10); and the arrangement (10) being characterized in that the second surface (33) of the encapsulation device (30) has on its contour a structural detail (34) of revolution around the axis (31) of the encapsulation device (30) and extending axially, in that the retaining wall (12) of the fastening device (10) has on its external surface (18) geometric details (40, 41), angularly equidistant around the axis (21) of the fastening device (10) over an angular sector 9 of the retaining wall (12), in that at least one of the geometric details (41) is arranged such that the line passing through at least one geometric detail and perpendicular to the axis (21) of the retaining wall (12) is parallel to the axial direction vector (201) or to the circumferential direction vector of the cylindrical coordinate system associated with the intersection of the axis (21) of the retaining wall (12) with the internal surface (130) of the tire (100), said geometric detail (41) defining the origin of the angular coordinate system, in that each geometric detail (40,41) and the midpoint between two adjacent geometric details are particular geometric points (43) and in that a radial line perpendicular to the axis (31) of the encapsulation device (30) passing through the structural detail (34) of the second surface (33) of the encapsulation device (30) and a radial line perpendicular to the axis (21) of the retaining wall (12) passing through a particular geometric point of the external surface (18) of the retaining wall (12) are parallel.

2. Arrangement according to claim 1 wherein the geometric details (40, 41) are elements projecting from the external surface (18) of the retaining wall (12) of the fastening device (10).

3. Arrangement according to any one of claims 1 to 2 wherein one of the ends of each geometric detail (40, 41) is part of the free edge (13) of the retaining wall (12) of the fastening device (10).

4. Arrangement according to any one of claims 1 to 3 wherein the angle X defined between two adjacent geometric details (40,41) is at most 12 degrees.

5. An arrangement according to any one of claims 1 to 4, wherein the geometric details (40) are evenly distributed on either side of the geometric detail (41) defining the origin of the angular frame on an angular sector 9 of at least 120 degrees, preferably on an angular sector 9 of at least 180 degrees, preferably on an angular sector 9 of 360 degrees.

6. An arrangement according to any one of claims 1 to 5 wherein the geometric detail (41) defining the origin of the coordinate system has a specific section in relation to the section of the other geometric details (40).

7. Arrangement according to claim 6 wherein the specific section of the geometric detail (41) defining the origin of the reference frame differs in shape and / or dimension from the section of the other geometric details.

8. An arrangement according to any one of claims 1 to 7 wherein, the electronic board (6) comprising at least one measuring sensor (7) capable of measuring at least two physical parameters of the electronic element (1) along two perpendicular directions contained in the plane (50) of the printed circuit board (5), a first direction D having a constant angle y with respect to the vector perpendicular to the axis (31) of the encapsulation device (30) and passing through the orthogonal projection (53) of the structural detail (34) onto the plane (50) of the printed circuit board (5) and the structural detail (34) of the electronic element (1) aligned with the geometric detail (41) defining the origin of the angular reference frame of the fastening device (10),The physical parameters of the electronic organ (1) expressed in the direct orthonormal frame associated with the origin of the angular frame of the fixing device (10) are derived from a transformation of the measurements of at least one measuring sensor (7) by a rotation matrix of angle y.

9. An arrangement according to any one of claims 1 to 7, wherein the electronic board (6) comprises at least one measuring sensor (7) capable of measuring at least two physical parameters of the electronic component (1) along two perpendicular directions contained in the plane (50) of the printed circuit board (5), a first direction D having a constant angle y with respect to the vector perpendicular to the axis (31) of the encapsulation device (30) and passing through the orthogonal projection (53) of the structural detail (34) on the plane (50) of the printed circuit (5), the structural detail (34) is positioned at an angle - y with respect to the geometric detail (41) defining the origin of the angular reference frame of the fixing device (10).

10. An arrangement according to any one of claims 1 to 9 in which, the radio frequency antenna (2) of the electronic element (1) being directional and having a maximum gain along a vector G whose orthogonal projection onto the plane (50) of the printed circuit board (5), having a first end (51) and a second end (52) on the plane (50), has a constant angle α with respect to the vector perpendicular to the axis (31) of the encapsulation device (30) passing through the orthogonal projection (53) of the structural detail (34) onto the plane (50) of the printed circuit board, the structural detail (34) is positioned at an angle -α with respect to the geometric detail (41) defining the origin of the angular reference frame of the fixing device (10).

11. Arrangement according to the preceding claim wherein the physical parameters of the electronic element (1) expressed in the direct orthonormal frame associated with the origin of the angular frame of the fastening device (10) are derived from a transformation of the measurements of at least one measuring sensor (7) by a rotation matrix of angle -a.

12. An arrangement according to any one of claims 1 to 9 wherein, the radio frequency antenna of the electronic element (1) being directional and having a maximum gain along a vector G whose orthogonal projection onto the plane (50) of the printed circuit board (5), having a first end (51) and a second end (52) on the plane (50), has a constant angle α with respect to the vector perpendicular to the axis (31) of the encapsulation device (30) passing through the orthogonal projection (53) of the structural detail (34) onto the plane (50) of the printed circuit board, the structural detail (34) is positioned at an angle 90° - α with respect to the geometric detail (41) defining the origin of the angular reference frame of the fixing device (10), α being expressed in degrees.

13. Arrangement according to the preceding claim wherein the physical parameters of the electronic element (1) expressed in the direct orthonormal frame associated with the origin of the angular frame of the fastening device (10) are derived from a transformation of the measurements of at least one measuring sensor (7) by a rotation matrix of angle 90°-a.

14. An arrangement according to any one of claims 1 to 9 in which, the radio frequency antenna of the electronic element (1) being directional and having a maximum gain along a vector G whose orthogonal projection onto the plane (50) of the printed circuit board (5), having a first end (51) and a second end (52) on the plane (50), has a constant angle α with respect to the vector perpendicular to the axis (31) of the encapsulation device (30) passing through the orthogonal projection (53) of the structural detail (34) onto the plane (50) of the printed circuit board, the structural detail (34) is positioned at an angle P - α with respect to the geometric detail (41) defining at the origin of the angular frame of the fixing device (10).

15. Arrangement according to the preceding claim in which the physical parameters of the electronic element (1) expressed in the direct orthonormal frame associated with the origin of the angular frame of the fastening device (10) are derived from a transformation of the measurements of at least one measuring sensor (7) by a rotation matrix of angle Pa.

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