FR3075100A1 - MOUNTED ASSEMBLY FOR VEHICLE WITH CHARACTERISTIC MONITORING SYSTEM OF CLOSED PNEUMATIC BANDAGE - Google Patents

Abstract

 The invention relates to a mounted assembly (1) for a vehicle (2) comprising a mounting element (3) on which a closed pneumatic tire (5) with a supporting structure (4) is adjusted. According to the invention, the mounted assembly (1) comprises a system (13) for monitoring at least one characteristic (P, CH, A, F) of the closed pneumatic tire (5) with supporting structure (4) comprising a device (15) for detecting contact pressure at the interface between the mounting element (3) and the closed pneumatic tire (5) with supporting structure (4) in order to determine the characteristic (P, CH, A, F ) of the closed pneumatic tire (5) with supporting structure (4) as a function of the stress (C) exerted by the closed pneumatic tire (5) with supporting structure (4) on the mounting element (3).

Description

VEHICLE MOUNTED ASSEMBLY WITH A CLOSED TIRE CHARACTERISTIC MONITORING SYSTEM

TECHNICAL FIELD OF THE INVENTION The present invention relates to a mounted assembly comprising a closed pneumatic tire with supporting structure and, more particularly, such a mounted assembly of which one (or more) characteristic (s) of the pneumatic tire closed to load-bearing structure can be monitored.

TECHNICAL BACKGROUND OF THE INVENTION European automotive standards require manufacturers to monitor the pressure of each tire. More generally, it is particularly useful for the user of a motor vehicle to be able to be informed of changes in the characteristics of the pneumatic tires, for example, in the event of a pressure decrease below a threshold and / or d '' a rapid decrease in pressure in order to maintain the optimal functioning of the motor vehicle (consumption, handling, etc.) and / or be warned of a potential damage to one (or more) pneumatic tire (s) of the vehicle.

It is already known, as for example by documents WO 2016/116490 and WO 2017/005713, a mounted vehicle assembly comprising a mounting element, also called mounting wheel or rim, on which a pneumatic tire is adjusted closed with supporting structure.

Such a closed pneumatic tire with a supporting structure has an internal annular space arranged to be pressurized by an inflation gas. As its name suggests, this type of closed pneumatic tire has a load-bearing structure mounted in the internal annular space. More specifically, it includes deformable elements under a predetermined stress (lower than that of the load induced by the motor vehicle). The supporting structure thus allows the load applied to the closed tire to be carried by the tensioning of part of the deformable elements positioned outside the ground contact area of the tread.

In such a closed pneumatic tire with a supporting structure, it is difficult to integrate a system for monitoring characteristics, such as pressure. In fact, unlike the conventional pneumatic tire, access to the internal annular space can be reduced and the placement of the sensors inside this internal annular space can be difficult.

SUMMARY OF THE INVENTION The purpose of the invention is to propose a new assembled assembly for a vehicle comprising a monitoring system of at least one characteristic of the closed pneumatic tire with a support structure that is easily integrated and inexpensive.

To this end, the invention relates to a mounting element for a vehicle comprising a mounting element on which a closed pneumatic tire with supporting structure is adjusted, said closed pneumatic tire with supporting structure comprising: A structure of revolution radially exterior fitted with a tread,

A radially inner structure of revolution coaxial with the radially outer structure of revolution,

Two sides, connecting the axial ends of the structures of revolution respectively radially outer and radially inner, delimiting an internal annular space arranged to be pressurized by an inflation gas, and

A load-bearing structure mounted in the internal annular space and comprising deformable elements regularly distributed between the radially exterior revolution structure and the radially interior revolution structure in order to connect the latter, characterized in that it comprises a system for monitoring at least one characteristic of the closed pneumatic tire with supporting structure comprising a contact pressure detection device at the interface between the mounting element and the closed pneumatic tire with supporting structure in order to determine the characteristic of the closed pneumatic tire with supporting structure depending on the stress exerted by the closed pneumatic tire with supporting structure on the mounting element. Advantageously according to the invention, it has been found that, in such a mounted assembly, the contact pressure measured by the detection device is substantially proportional to the inflation pressure of the internal annular space. It is therefore understood that the monitoring system according to the invention makes it possible to meet automotive standards with a simple and inexpensive architecture.

In addition, its advantageous location does not require the development of new dedicated closed pneumatic tires, that is to say adapted as regards interactions with the mounting element. The installation in the mounting element also makes it possible to be able to measure the signals from the detection device in a wired or wireless manner, that is to say with an on-board energy source and wireless or wireless communication.

- 3 In addition, the supporting structure present in the internal annular space advantageously makes it possible to obtain other characteristics of the closed pneumatic tire. Thus, advantageously according to the invention, the monitoring system is also capable of determining the contact area of the closed tire, the load carried by the closed tire and the deflection of the closed tire. These new detections bring an advantage in the operation of the vehicle because they offer the possibility of adapting the controls of different organs (engine (s), gearbox, aerodynamic system (s), etc.) of the vehicle in time. real.

The invention may also include other optional features.

The closed pneumatic tire with supporting structure is held on the mounting element by the forces resulting from the pressurization of the internal annular space of the closed pneumatic tire and / or by bonding. This is because maintaining the closed pneumatic tire with supporting structure can be achieved, for example, by tightening, that is to say stretching the material of the closed pneumatic tire with supporting structure, during mounting on the mounting element. (for example by a larger external section of the mounting element relative to that internal of the closed tire) and / or during the inflation of the closed tire. However, alternatively or additionally, the closed pneumatic tire with supporting structure can be held by an adhesive material against the mounting element.

The deformable elements include textile yarns and / or metal cables arranged in the form of son and / or strip between the radially outer structure of revolution and the radially inner structure of revolution, for example those disclosed in documents WO 2016 / 116490 and WO 2017/005713.

The tread further comprises a reinforcing reinforcement which ensures the mechanical characteristics of the closed tire with supporting structure during movement of the vehicle.

The contact pressure detection device is in contact with the outer face of the radially inner structure of revolution of the closed tire with supporting structure which allows the detection device to be mounted directly at the interface between the element and the tire closed.

The contact pressure detection device is mounted on a substantially cylindrical peripheral surface of the mounting element. Typically, this surface can be formed from a generator along a circular path making it possible to make the signal from the detection device homogeneous over a complete rotation of the closed pneumatic tire with supporting structure.

The contact pressure detection device preferably includes at least one contact pressure sensor. Each contact pressure sensor is

- 4locked in a recess in the periphery of the mounting element which allows each pressure sensor to be mounted flush or protruding from the mounting element and that it does not move or hardly moves relative to the element of mounting.

Preferably, the contact pressure sensor is of the capacitive, piezoelectric or piezoresistive type in order to be able to recover a signal of the electrical type capable of being analyzed.

BRIEF DESCRIPTION OF THE DRAWINGS Other features and advantages will emerge clearly from the description which is given below, for information and in no way limitative, with reference to the appended drawings, in which:

Figure 1 is a schematic side view of the front of a motor vehicle;

Figure 2 is a schematic cutaway view of an assembly mounted according to the invention;

Figure 3 is a schematic side view of a load-bearing structure according to the invention;

Figure 4 is a partial schematic sectional view of a first embodiment of the assembly mounted according to the invention, centered on a portion of the interface between the closed tire with supporting structure and the mounting element;

Figure 5 is a sectional view of a capacitive contact sensor according to the invention;

Figure 6 is a sectional view of a piezoresistive contact sensor according to the invention;

Figure 7 is a partial schematic sectional view of a second embodiment of the assembly mounted according to the invention, centered on a portion of the interface between the closed tire with supporting structure and the mounting element;

FIG. 8 is a diagram representing the signal of a contact sensor according to the invention as a function of the inflation pressure of the closed tire with support structure;

FIG. 9 is a diagram representing the signal of a contact sensor according to the invention as a function of the angle of rotation of the closed tire with support structure.

- 5 DETAILED DESCRIPTION OF AT LEAST ONE EMBODIMENT OF THE INVENTION In the various figures, identical or similar elements bear the same references, possibly with a subscript. The description of their structure and their function is therefore not systematically repeated.

In all that follows, the terms of orientation are understood with respect to the orthogonal coordinate system taken with reference to the normal direction of movement of a motor vehicle 2, shown in FIG. 2 and in which there are:

A circumferential orientation along the horizontal XX ′ axis extending from the rear to the front;

An axial orientation along the horizontal YY axis extending from right to left; and

A radial orientation along the vertical ZZ axis extending from top to bottom.

The term "horizontal" is defined relative to the plane XX’-YY ’, the term" vertical "is defined relative to the plane XX’-ZZ’ or YY’-ZZ ’.

By "pneumatic tire" means all types of elastic tires subjected to internal pressure. The invention applies to any type of pneumatic tire, in particular those intended to equip motor vehicles of the tourism type, SUV (“Sport Utility Vehicles”), two wheels (in particular motorcycles), airplanes, industrial vehicles chosen from vans, "Heavy goods vehicles" - that is to say metro, bus, road transport equipment (trucks, tractors, trailers), off-road vehicles such as agricultural or civil engineering vehicles - or other vehicles transport or handling. The invention also applies to non-motorized vehicles such as a trailer, a semi-trailer or a caravan.

The invention relates to a mounted assembly 1 of a motor vehicle 2 authorizing the monitoring of several characteristics such as its good inflation and its deflection. More specifically, the mounted assembly 1 comprises a mounting element 3 on which is fitted a closed pneumatic tire 5 with a supporting structure 4. The mounting element 3, also called mounting wheel or rim, is a member intended to be attached on the suspension system (not shown) of the motor vehicle 2 in order to cause the latter to advance by its rotation. Compared to a conventional mounting element for an open tire, the mounting element 3 according to the invention may optionally include a substantially cylindrical peripheral surface which is suitable for adjusting a closed pneumatic tire 5 with a supporting structure 4.

- 6 As illustrated in FIG. 2, the closed pneumatic tire 5 with a supporting structure 4 according to the invention preferably comprises:

A structure 7 of radially outer revolution provided with a tread 8,

A structure 9 of radially inner revolution coaxial with the structure 7 of radially outer revolution,

Two sides 10 and 11, connecting the axial ends of the structures 7, 9 of revolution respectively radially exterior and radially interior by delimiting an internal annular space 12 arranged to be pressurized by an inflation gas, for example by means of an inflation valve secured to the closed pneumatic tire 5 with a supporting structure 4, and

A supporting structure 4 mounted in the internal annular space 12 and comprising deformable elements 6, 6d, 6p regularly distributed between the structure 7 of radially outer revolution and the structure 9 of radially inner revolution in order to connect the structure 7 of radially outer revolution and the structure 9 of radially inner revolution.

Such a type of closed pneumatic tire 5 with a supporting structure 4 is already known from documents WO 2016/116490 and WO 2017/005713 incorporated by reference in the present description. As can be seen in FIG. 3, the internal annular space 12 comprises the support structure 4 provided with elements 6, 6d, 6p deformable under a predetermined stress (less than that of the load Ch induced by the motor vehicle). The supporting structure 4 thus makes it possible to carry all or part of the load Ch applied to the closed pneumatic tire 5 by the tensioning of a part of the deformable elements 6, 6d positioned outside the area A of contact with the ground between the structure 7 of radially outer revolution and structure 9 of radially inner revolution.

It is therefore understood that there is always a part of the deformable elements 6, 6p which support the load Ch of the motor vehicle 2, the shape of which is modified by bringing the structure 7 of radially outer revolution towards the structure 9 of radially inner revolution. The rest of the deformable elements 6, 6d maintain a substantially constant distance between the structure 7 of radially outer revolution and the structure 9 of radially inner revolution, and oppose the crushing of the closed pneumatic tire 5 at the area A of contact with the ground, in particular for those present in the symmetrical region, with respect to the center O of the mounting element 3, of said contact area A, that is to say present around the vertical of the ground contact area A.

- 7 Of course, each side 10,11 and / or the tread 8 and / or the structure 7 of radially outer revolution and / or the structure 9 of radially inner revolution may include a reinforcing reinforcement intended to guarantee the mechanical characteristics of the closed pneumatic tire 5 with a supporting structure 4 during movement of the motor vehicle 2.

Preferably, the closed pneumatic tire 5 with a supporting structure 4 is held on the mounting element 3 by the forces resulting from the pressurization of the internal annular space 12 of the closed pneumatic tire 5 and / or by bonding. More specifically, the structure 9 of radially inner revolution of the closed pneumatic tire 5 with supporting structure 4 is adjusted on the peripheral surface of the mounting element 3.

Preferably according to the invention, the mounted assembly 1 comprises a system 13 for monitoring the characteristics of the closed pneumatic tire 5 with supporting structure 4 without being integral with the latter. In fact, it was chosen to allow implantation which does not require the development of new closed pneumatic tires 5 with dedicated support structure 4, that is to say modified to receive the monitoring system 13. In fact, any closed pneumatic tire 5 with a supporting structure 4 can be adjusted on the mounting element 3. Of course, nothing prevents the system 13 for monitoring the characteristics of the closed pneumatic tire 5 with supporting structure 4 of the mounted assembly 1 from being alternately secured to the closed pneumatic tire 5 with supporting structure 4.

The pressure P prevailing in the internal annular space 12, the area A of contact with the ground, the load Ch carried and the arrow F of the closed pneumatic tire 5 with support structure 4 can thus, advantageously, be determined precisely without intervening on the structure of the closed pneumatic tire 5 with supporting structure 4 and without restriction as to the dimensions of its internal annular space 12.

According to a first embodiment, the monitoring system 13 preferably comprises a device 15 for contact pressure detection mounted on the mounting element 3. More specifically, the detection device 15 is mounted at an interface between the closed pneumatic tire 5 with support structure 4 and the mounting element 3 in order to determine characteristics of the closed pneumatic tire 5 with support structure 4 as a function of the stress C of the closed pneumatic tire 5 with a supporting structure 4 exerted on the mounting element 3.

Indeed, advantageously according to the invention, it has been found that, in such an assembly 1 mounted, the contact pressure measured by the detection device 15 is substantially proportional to the pressure P for inflation of the space 12 inner ring of the closed pneumatic tire 5 with supporting structure 4 and that other characteristics

- 8 can also be deducted. It is therefore understood that the monitoring system 13 according to the invention is simple and inexpensive.

Preferably, the detection device 15 comprises at least one contact pressure sensor 17, for example, of the capacitive, piezoelectric or piezoresistive type. Each contact pressure sensor 17 can for example be housed in a recess in the peripheral surface of the mounting element 3 as illustrated in FIG. 3. In addition, the detection device 15 comprises an element 16 for acquiring each contact pressure sensor 17 intended to collect the signals continuously or not.

The location of the detection device 15 in the mounting element 3 makes it possible to be able to measure the signals of the detection device 15 by wire (as visible in FIG. 3) or not (wireless communication using a source d dedicated energy). FIG. 8 is a diagram representing the signal of a contact sensor 17 according to the invention as a function of the inflation pressure P of a closed pneumatic tire 5 with a supporting structure 4.

More particularly, the curve Di corresponds to the signal from a contact sensor 17 placed at an interface (shown in FIG. 3) at which the closed pneumatic tire 5 with supporting structure 4 is tightened on the element 3 mounting and facing no armature of the closed pneumatic tire 5 with supporting structure

4. It can be seen that the tightness and the low longitudinal rigidity, at the level of the interface where the sensor 17 is placed, give a signal S which is low in the absence of pressure P in the internal annular space 12 then increases, along a substantially constant slope, as the pressure P increases in the internal annular space 12.

Figure 9 is a diagram showing the signal from a contact sensor 17 according to the invention as a function of the angle a ("alpha") of rotation of a closed pneumatic tire 5 with a supporting structure 4. More in particular, the curve D2 corresponds to the signal S of a contact sensor 17 placed at an interface (shown in FIG. 3) at which the closed pneumatic tire 5 with supporting structure 4 is tightened on the mounting element 3 and facing no armature of the closed pneumatic tire 5 with supporting structure 4. It is noted that the signal S is variable around the wheel, passing through a maximum S2 which is mainly a function of the inflation pressure P in the area of the area Has contact. Outside this zone, the contact pressure decreases because there is a tension in the deformable elements 6, 6d.

It can be seen that the signal S begins at a value Si corresponding to the stress induced by the mounting tightening of the closed pneumatic tire 5 with supporting structure 4 on the mounting element 3 and by the pressure P in space 12

- 9annular internal. It is therefore understood that the value Si corresponds to the zone where the sensor 17 is surrounded by deformable elements 6, 6d maintaining a substantially constant distance between the structure 7 of radially outer revolution and the structure 9 of radially inner revolution, and opposing when the closed pneumatic tire 5 is crushed at the level of the ground contact area A in the manner of shrouds. The signal Si therefore makes it possible to directly deduce the pressure P in the internal annular space 12 by interpolating the curve Di in FIG. 8.

It can be seen that the signal S goes from the value Si to a value S2 corresponding to the stress induced by the mounting tightening of the closed pneumatic tire 5 with supporting structure 4 on the mounting element 3, by the pressure P in the internal annular space 12 and the load Ch induced by the motor vehicle 2. It is therefore understood that the value S2 corresponds to the zone where the sensor 17 is surrounded by deformable elements 6, 6p whose shape is modified by the approximation from the structure 7 of radially outer revolution to the structure 9 of radially inner revolution. Maintaining the signal S at the value S2 is a function of the length of the contact area A, the Koutny radius (Rk) and the composition of the closed tire

5. This relation is known for a given architecture. The signal plateau S2 therefore makes it possible to deduce directly by its angular amplitude Δα, the length Xa of the contact area along the axis X. In addition, the difference AS between the signals S2 and Si (AS = S2-Si) makes it possible to deduce the load Ch induced by the motor vehicle 2. In fact, knowing the architecture of the mounting element 3 - closed pneumatic tire 5 with supporting structure 4, the load Ch and the pressure P, it is possible to precisely estimate the deflection F as shown in Figure 1.

The arrow F is very useful for predicting the reaction of a motor vehicle 2 according to the driving circumstances encountered (speed, steering angle, etc.). The monitoring system 13 therefore advantageously makes it possible to provide characteristic data in real time for each closed pneumatic tire 5 with a supporting structure 4 enabling the control of the controls of different members (engine (s), gearbox, aerodynamic system (s) (s), etc.) of the motor vehicle 2. The arrow F also makes it possible to follow the rate of use of the tire to estimate a rate of remaining endurance.

Therefore, it is understood that the location (at a reinforcement of the closed tire bandage 5 or not) and mounting (with or without tightening) are characteristics to be taken into account in order to optimize the operation of the monitoring system 13. Preferably, a curve of the D1 type is desired because it makes it possible to detect all the variations in pressure P and according to good precision (pronounced slope). We also understand that it is preferred

- 10 calibrate beforehand the signals from the sensors 17 according to the architecture of the mounting element 3 - closed pneumatic tire 5 with supporting structure 4 chosen as explained below. Of course, several sensors 17 can be distributed over the peripheral surface of the mounting element 3 in order to correlate their signal in order to make the monitoring device 13 more reliable.

The monitoring system 13 further comprises a module 19 for determining the characteristics P, Ch, A, F intended to process the signals collected by the acquisition element 16. The determination module 19 comprises in particular an element 20 for calculating the characteristics P, Ch, A, F cooperating with a support 21 comprising a calibrated database.

As suggested above, the previously established calibrated database corresponds to the relationship between the signals measured by each sensor 17 according to different values of the characteristics P, Ch, A, F imposed according to the architecture element 3 of mounting - closed pneumatic tire 5 selected. The element 20 for calculating the characteristics P, Ch, A, F is therefore capable, for example by successive iterations, of determining, from the calibrated database, a pressure value P in the internal annular space 12 of the closed pneumatic tire 5, a value of the ground contact area A, a value of the load Ch carried by the closed pneumatic tire 5 with supporting structure 4 and a value of the deflection F of the closed pneumatic tire 5 with supporting structure 4 .

For statistical (massive data) and / or maintenance (checking during maintenance) considerations of the motor vehicle 2, the module 19 for determining the characteristics P, Ch, A, F may also optionally include an element 22 recording the values of the characteristics P, Ch, A, F calculated as a function of time making it possible to display the time drift of the characteristics P, Ch, A, F of each closed pneumatic tire 5 with supporting structure 4. Obviously, d other factors and / or sensors can be used by the module 19 for determining the characteristics P, Ch, A, F. For example, the monitoring system 13 could also include a temperature sensor whose signal would also be used by the element 20 for calculating the characteristics P, Ch, A, F from the calibrated database also including different temperatures.

The sensors 17 are preferably able to measure a pressure applied continuously and constantly. Indeed, they must be able to provide a signal during inflation and deflation of the closed pneumatic tire 5.

Preferably, the sensors 17 can be of the capacitive and / or piezoresistive type, that is to say only capacitive, only piezoresistive or a mixture of the two.

- 11 [0048] Figure 5 is a sectional view of a first variant of a capacitive type contact sensor 17 according to the invention. In this example, the sensor 17 is integrated in a suitable housing of the mounting element 3. It comprises a dielectric enclosure 23 formed for example from a solid electrically insulating material intended to electrically isolate the sensor 17 from the mounting element 3. The enclosure 23 is provided with a recess 24 in which a capacitive element 25 is mounted.

In the example of Figure 5, the capacitive element 25 is formed by a successive stack of an electrically conductive layer 26, an electrically insulating layer 27, a gap 28 (for example a filled space air) then again with an electrically conductive layer 29. Preferably, the electrically insulating layer 27 has a high dielectric permittivity ε, · (“epsilon”) which is greater than 1.5, for example.

When the closed pneumatic tire 5 is inflated, it will exert an increasing stress C on the electrically conductive layer 29 of the sensor 17 by deforming it. This deformation brings the two electrically conductive layers 26, 29 closer to the capacitive element 25 resulting in a variation of the signal S of the sensor 17. The deformation zone centered on the surface in contact with the closed pneumatic tire 5 fills part of the gap 28 until a portion of the electrically conductive layer 29 is touched with the electrically insulating layer 27. Preferably, a geometry of contact and stacking surface of the capacitive element 25 will be chosen so as to avoid saturation of the sensor 17 as long as the pressure P is lower than the inflation pressure recommended for the closed pneumatic tire 5 with structure carrier 4 and that the load Ch is less than the maximum load recommended for the closed pneumatic tire 5 with carrier structure 4.

For example, in the case of a closed pneumatic tire 5 with high inflation pressure P, such as a closed pneumatic tire 5 with a load-bearing structure 4, there will for example be a transverse dimension of the sensor 17 higher, than in the case of a pneumatic tire of the passenger type.

In practice, the capacity obtained will be proportional to the contact surface of the electrically conductive layer 29 with the electrically insulating layer 27. This capacity can be, for example, measured simply by positioning it inside a simple LC resonant circuit included in the acquisition element 16. Indeed, it is known to those skilled in the art that this type of circuit resonates at a frequency equal to 1 / (2 * PI * root (L * C)). Thus, if the capacity varies, the frequency of resonance will vary as much. It is therefore possible to evaluate the value of the capacitive element 25 by simply measuring the frequency obtained and then to carry out the pressure measurement using the module 19 for determining the pressure P. Preferably, a

- 12module 19 fitted with a microcontroller capable of determining at regular intervals the values of the characteristics P, Ch, A, F rather than continuously in order to advantageously save the necessary energy.

However, since it is desired to obtain measurements as a function of the turn of the closed pneumatic tire 5, it is necessary to choose sufficiently short intervals for sufficient accuracy of the element 20 for calculating the characteristics P, Ch, A, F By way of example, in the case of a closed pneumatic tire 5 with a support structure 4 of the sport type, the motor vehicle 2 can reach 300 km.h ′ ¹ . Thus, for a development equal to two meters, a wish of a hundred measurements per revolution of closed pneumatic tire 5, a resonance frequency of 40 KHz will be required so that ten periods can be picked up for each measurement. The sampling frequency suitable for measuring this resonance frequency will therefore be of the order of 400 KHz.

Figure 6 is a sectional view of a second variant of contact sensor 17 of the piezoresistive type according to the invention. In this example, the sensor 17 is integrated in a suitable housing of the mounting element 3. It comprises a resistive element 31 formed by a successive stack of an electrically conductive layer 32, of a layer 33 of piezoresistive material then again of an electrically conductive layer 34. For information, a piezoresistive material of the VELOSTAT® or LINQSTAT® type from the company Adafruit® can be used.

When the closed pneumatic tire 5 with a supporting structure 4 is inflated, it will exert an increasing stress C on the electrically conductive layer 34 of the sensor 17 by deforming it. This deformation crushes the layer 33 of piezoresistive material between the two electrically conductive layers 32, 34 of the resistive element 31 resulting in a variation of the signal S of the sensor 17.

Preferably, a geometry of the contact and stacking surface of the resistive element 31 will be chosen so as to avoid saturation of the sensor 17 as long as the pressure P is lower than the inflation pressure recommended for the closed pneumatic tire. 5 with load-bearing structure 4 and that the load Ch is less than the maximum load recommended for the closed pneumatic tire 5 with load-bearing structure 4.

In practice, the resistance obtained will be proportional to the hydrostatic pressure exerted on the layer 33 of piezoresistive material. This resistance can for example be measured simply by positioning it inside a Wheatstone bridge well known to those skilled in the art included in the acquisition element 16. Preferably, a module 19 will be used fitted with a microcontroller capable of determining the characteristics P, Ch, A, F at regular intervals rather than continuously in order to advantageously save the necessary energy.

- 13 According to a second embodiment, the monitoring system 13 preferably comprises a device 35 for contact pressure detection mounted on the mounting element 3. Preferably, the detection device 35 comprises at least one contact pressure sensor 37, for example, of the piezoelectric type.

Each contact pressure sensor 37 can for example be housed in a hole 36 passing through the peripheral surface of the mounting element 3 (not shown) or in a recess in the peripheral surface of the mounting element 3 opposite a non-through hole of the mounting element 3 as illustrated in FIG. 7. This arrangement allows the sensor 37 to undergo a slight but sufficient deformation to generate a signal such as typically an electrical voltage. Of course, the sensor 37 is dimensioned to guarantee in particular its mechanical reliability as a function of the envisaged application.

Consequently, the device 35 differs from that of the first embodiment only by the type of signals which are not received continuously but only during the alternating passages between the values Si and S2 (cf. FIG. 9 ).

The sensors 37 are preferably able to measure only a variable pressure applied. It is therefore understood that it is not possible to directly deduce the pressure P from the closed pneumatic tire 5 with a supporting structure 4. Consequently, compared with the second variant of the first embodiment illustrated in FIG. 6, preferably, the second embodiment mainly replaces the layer 33 of piezoresistive material in a piezoelectric material. This piezoelectric material can, for example, be a simple piezoelectric beeper, sometimes called a piezoelectric buzzer, used in generator mode rather than in beeper mode.

Compared to the first embodiment, only the module 19 of the monitoring system 13 is adapted accordingly in order to determine the characteristics P, Ch, A, F of the other types of signals collected by the acquisition element 16 . Consequently, in the second embodiment, the angular amplitude Δα and the difference AS are directly measured by the acquisition element 16.

Thus, as for the first embodiment, the angular amplitude Δα makes it possible to deduce the length Xa of the contact area along the axis X and, the difference AS, the load Ch induced by the motor vehicle 2 The calculation element 20 then estimates from the calibrated database previously established the inflation pressure P. Finally, knowing the architecture of the mounting element 3 - closed pneumatic tire 5 with supporting structure 4, the load Ch and the pressure P, one can precisely estimate the deflection F as shown in FIG. 1.

Obviously, as for the first embodiment, other factors and / or sensors can be used by the module 19 for determining the

- 14 characteristics P, Ch, A, F in the second embodiment. By way of example, the monitoring system 13 could also include a temperature sensor, the signal of which would also be used by the element 20 for calculating the characteristics P, Ch, A, F from the calibrated database also including different 5 temperatures. It is indeed known that temperature has an effect on the voltage level generated by a piezoelectric element, especially in the vicinity of the Curie temperature. The invention is not limited to the embodiments and variants presented and other embodiments and variants will be apparent to those skilled in the art. Thus, the invention cannot be limited to sensors 17, 37 presented above. Other types of contact pressure sensors 17, 37 could thus be envisaged.

It is also possible that the calculation interval of the determination module 19 is not regular but can be modified depending on the circumstances. For example, in the event that a pressure variation P is detected, provision could be made to increase the measurement frequency in order to raise reliable and more frequent alerts able in particular to warn as soon as possible of the rapid deflation of the pneumatic tire closed 5.

Claims (8)

1. Mounted assembly (1) for vehicle (2) comprising a mounting element (3) on which a closed pneumatic tire (5) with supporting structure (4) is adjusted, said closed pneumatic tire with supporting structure comprising: A radially outer structure (7) of revolution provided with a tread (8), A structure (9) of radially inner revolution coaxial with the structure (7) of radially outer revolution, Two sidewalls (10, 11), connecting the axial ends of the structures (7, 9) of revolution radially exterior and radially interior respectively by delimiting an internal annular space (12) arranged to be pressurized by an inflation gas, and A supporting structure (4) mounted in the internal annular space (12) and comprising deformable elements (4) regularly distributed between the structure (7) of radially outer revolution and the structure (9) of radially inner revolution in order to connect these last, characterized in that it comprises a system (13) for monitoring at least one characteristic (P, Ch, A, F) of the closed pneumatic tire (5) with supporting structure (4) comprising a device (15) of contact pressure detection at the interface between the mounting element (3) and the closed pneumatic tire (5) with supporting structure (4) in order to determine the characteristic (P, Ch, A, F) of the pneumatic tire closed (5) with supporting structure (4) as a function of the stress (C) exerted by the closed pneumatic tire (5) with supporting structure (4) on the mounting element (3). 2. Mounted assembly (1) according to the preceding claim, in which the closed pneumatic tire (5) with supporting structure (4) is held on the mounting element (3) by the forces resulting from the pressurization of the space ( 3) inner ring of the closed pneumatic tire (5) with supporting structure (4) and / or by bonding. 3. Mounted assembly (1) according to any one of the preceding claims, in which the deformable elements (4) comprise textile yarns and / or metal cables arranged in the form of son and / or strip between the structure (7) of radially outer revolution and the structure (9) of radially inner revolution. 4. Mounted assembly (1) according to any one of the preceding claims, in which the tread (8) further comprises a reinforcing reinforcement. 5. Mounted assembly (1) according to any one of the preceding claims, 5 in which the contact pressure detection device (15) is in contact with the external face of the structure (9) of radially inner revolution of the closed pneumatic tire (5) with supporting structure (4). 6. Mounted assembly (1) according to any one of the preceding claims, in which the device (15) for contact pressure detection is mounted on 10 a substantially cylindrical peripheral surface of the mounting element (3). 7. Mounted assembly (1) according to any one of the preceding claims, in which the device (15) for contact pressure detection comprises at least one sensor (17) for contact pressure, each sensor (17) for contact pressure. contact being housed in a recess in the periphery of the element (3) of 15 mounting. 8. Mounted assembly (1) according to the preceding claim, wherein the contact pressure sensor is of the capacitive, piezoelectric or piezoresistive type.