• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention proposes a system for evaluating the state of a tire, the system comprising a first housing placed on the ground. The system comprises - a first sensor, installed in the housing, and intended to measure a first characteristic of a tire passing on the housing, - a second sensor, installed in the housing, and intended to measure a first characteristic of a tire. passing on the housing the first and the second sensors being positioned in such a way that the instants of passage of a vehicle rolling on the box at each of the sensors are distinct, and the system further comprising a control electronics comprising means determining a running direction of the vehicle on the housing according to the positions of each of the sensors in the housing and times of passage of a vehicle on each of the boxes.
    公开号:FR3030743A1
    申请号:FR1462593
    申请日:2014-12-17
    公开日:2016-06-24
    发明作者:Thomas Ledoux；Denis Martin；Guillaume Heredia；Alexandre Pernot
    申请人:Michelin Recherche et Technique SA Switzerland ；Compagnie Generale des Etablissements Michelin SCA；Michelin Recherche et Technique SA France；
    IPC主号:
    专利说明:

    [0001] FIELD OF THE INVENTION [0001] The present invention relates to a system for evaluating the state of a tire. More specifically, the invention relates to such a system provided with a device for detecting the direction of travel of a vehicle on this evaluation system. For the purposes of the present invention, a system for evaluating the state of a tire is, for example, but not exclusively, a system for detecting the wear of a tire, a system making it possible to detect the pressure of a tire, or by extension a system for measuring the speed of a tire. Thus, the invention also relates to a method for detecting the rolling direction of a tire on a system according to the invention. It also relates to a method for detecting the speed of passage of a vehicle on a system according to the invention. Many systems are known for diagnosing a vehicle. For wear, it is possible to cite wear indicators present on the tires, or manual devices for measuring the height of rubber remaining on a tire. [0005] Concerning the pressure measurement, there may be mentioned systems installed directly on the wheels of the vehicles, which determine the pressure by means of a pressure sensor and which then send the information by radiofrequency to the central electronics. of the vehicle ; dismounted systems for the measurement of tire contact pressure at ground level, or even manual pressure gauges. The present invention aims to provide a system, in particular for use by fleet managers of vehicles, which can be part of a more comprehensive system for diagnosing the state of a vehicle and its tires. However, none of the known systems allows, in the state, a cross-reference of different information concerning the vehicle and its tires. US document 2009/0000370 discloses a measuring system comprising a running wheel intended to accommodate the passage of a vehicle. However, it was found that, for large vehicles, it was sometimes necessary to use two separate wheel benches for each side of the vehicle, and that such a system could not identify, during a measurement. , the side of the vehicle concerned by the said measure. The present invention is therefore to overcome this disadvantage by proposing an improvement of existing vehicle diagnostic systems. P10-3514_EN - 2 - BRIEF DESCRIPTION OF THE INVENTION [0009] Thus, the invention proposes a system for evaluating the state of a tire, the system comprising a first housing placed on the ground, said system comprising - a first sensor, installed in the housing, and intended to measure a first characteristic of a tire passing on the housing, - a second sensor, installed in the housing, and intended to measure a second characteristic of a tire passing on the housing the first and second sensors being positioned in such a way that the instants of passage of a vehicle rolling on the housing at each of the sensors are distinct, and the system further comprising a control electronics comprising means for determining a running direction of the vehicle on the housing according to the positions of each of the sensors in the housing and times of passage of a vehicle on each of the 15 sensors. Such a system thus makes it possible to measure different characteristics of a tire in a single pass, and also makes it possible to detect the running direction of the vehicle on the system during this passage. In an advantageous embodiment, the first and second sensors are positioned in the housing so that the projection of their position on the flat upper face of the housing defines a line that is not orthogonal to the running direction of a vehicle. on the case. In an advantageous embodiment, the first and / or the second sensor are comprised in the group comprising - an eddy current wear sensor, a variable reluctance wear sensor, an optical wear sensor based on laser, pressure sensor or local load. In an advantageous embodiment, the system further comprises a tire presence detection device installed in the housing. Preferably, this presence detection device uses a single input on the control electronics of the system. In an advantageous embodiment, the presence detection device comprises a sensitive element comprised in the group comprising an accelerometer or any type of sensor sensitive to vibrations or shocks, a magnetometer or any type of sensor. a sensor sensitive to terrestrial magnetic field variation, an extensometer with resistant wires, also called strain gauges or strain gauges, a piezoelectric buzzer or any system using a material or a piezoelectric composite such as a piezoelectric paint. Alternatively, the tire presence detection device may consist of a sealed cavity accommodating a fluid and a pressure sensor installed so as to measure the pressure of the fluid in this cavity. The arrival of a tire on the housing causes an increase in pressure of the fluid in the cavity, detected by the pressure sensor. This signal can then be used as an indicator of the presence of a vehicle on the housing. In another example, it is possible to use a mechanical contact detector, implementing a flexible blade. This contact detector is positioned at one end of the cavity, and subjected to a movement of the fluid during an increase in pressure in the cavity. This detector closes electrically when a vehicle is present on the case. In an advantageous embodiment, the system comprises a first group of sensors of the same type as the first sensor, and a second group of sensors of the same type as the second sensor, the sensors of the first group being positioned so that their orthogonal projections on the planar upper surface of the housing form a first line, and the sensors of the second group being positioned so that their orthogonal projections on the planar upper surface of the housing form a second line, and the first and second lines being distinct, and oriented in a direction not parallel to the running direction of a vehicle on the housing. Preferably, the two lines are orthogonal to the running direction of a vehicle on the case. The use of a number of higher sensors ensures that the measurements are made during the passage of a vehicle on a box, and whatever the size of the vehicle tires. Indeed, by positioning several sensors on the width of the housing, it is ensured that any tire passing on the housing will pass at least above a sensor of the first group and a sensor of the second group. The number of sensors will therefore advantageously be chosen as a function of the dimensions of the box and the dimensions of the tires envisaged. These sensors will preferably be positioned in staggered rows. By staggered is meant a position in which the orthogonal projections of the sensors of the first group are regularly distributed over a first line, the orthogonal projections of the sensors of the second group are regularly distributed over a second line, and the elements the second line are offset by half a step from the elements of the first line, a step corresponding to the difference between two elements of the first line. This staggered positioning contributes to the efficiency of the measuring system as explained in the previous paragraph. In an advantageous embodiment, the system comprises a second housing identical to the first, the first and second housings being positioned such that during the passage of a vehicle, the tires located on a first side of the vehicle roll on the first case, and the tires located on a second side of the vehicle roll on the second case. The use of such a system with two housings is particularly advantageous for the evaluation of tires installed on large vehicles, for example heavy vehicles. This case will be described in detail with the help of the figures, in particular FIGS. 1c and 1d. The invention also relates to a method for determining the running direction of a vehicle on a system for evaluating the state of a tire according to the invention. This method comprises the following steps: a step of detecting the crossing of a first voltage threshold by the first sensor; a step of detecting the crossing of a second voltage threshold by the second sensor; the direction of travel according to the positioning of the two sensors and the chronology of the two previously detected crossings. This method finds a particularly advantageous application in the case, previously mentioned, of an evaluation system comprising two boxes. This application case will be further detailed using figures. The invention also relates to a method for measuring the speed of a tire rolling an evaluation system according to the invention. This method comprises the following steps: - a step of detecting the crossing of a first voltage threshold by the first sensor, - a step of detecting the crossing of a second voltage threshold by the second sensor, and P10-3514_EN - 5- a step of calculating the speed of the vehicle by dividing the distance between the orthogonal projections of the positions of each of the sensors on the flat upper face of the case by the time elapsed between the two previously detected crossings. In an advantageous embodiment, the distance between the orthogonal projections is recorded in a memory connected to the control electronics of the system. In another advantageous embodiment, the system according to the invention is provided with radio frequency communication means for transmitting the measured data to a remote server. In this case, the distance between the orthogonal projections can be recorded in a database installed on a remote server, and the calculation of the speed can be performed by calculation means associated with said database. DESCRIPTION OF THE BEST MODE OF CARRYING OUT THE INVENTION [0026] Other advantages and embodiments of the invention will become apparent with the detailed description of the figures, given in a non-limiting manner, in which: FIGS. 1a, 1b, 1c and 1d show an evaluation system having the drawbacks of the state of the art, and FIGS. 2a and 2b show an evaluation system according to the invention. Figures lc and ld show an evaluation system according to the state of the art, comprising two housings 20 and 30. These two identical boxes are positioned so that when a vehicle passes on the system , the tires installed on one side of the vehicle roll on one of the two boxes, and the tires installed on the other side of the vehicle roll on the other case: [0028] Each of the boxes is identical to the box 10 shown in figures la and lb. Such a box consists of two access ramps 15 and a horizontal wear measurement zone 16 situated between the two access ramps 15. It furthermore comprises: a line of sensors 100, for example wear sensors, positioned along a line transverse to the direction of travel of the vehicle arriving on the housing 10. These wear measuring sensors can be indifferently variable reluctance sensors, sensors to eddy currents or optical sensors based on lasers. P10-3514_EN -6- - A processing electronics 110 on which the measurement sensors 100 are connected. In this example, the processing electronics 110 also contains an RFID reader enabling the reading of the RFID chips integrated in the tires. or stuck on the vehicle whose tire wear is measured, as well as radio frequency transmission means for sending data to a remote database. In addition, the electronics 110 is equipped with a tire presence detection device 120 for activating the measuring system only when a tire 40 is present on the system. In the case described in this example, the tire presence detection device 120 consists of a single sensor that is sensitive, for example, to vibrations or shock waves propagating in the structure of the casing 10 upon arrival. a tire 40 on said housing. In an alternative embodiment of the housings 20 and 30, this sensor for detecting the presence of a tire is a sensor sensitive to the variation of the earth's magnetic field when a vehicle arrives on the measurement system. 100321 In any case, in the example of Figures 1a, 1b, 1c and 1d, the tire presence detection device 120 does not give information to determine the direction of travel of the tire that arrives on the tire system. measured. Thus, in the case of Figure lc, the vehicle 50 arrives on the two boxes 20 and 30 by the right. In this case, the tires located on the left side of the vehicle 50 will be seen by the box 30 and the tires located on the right side of the vehicle 50 will be seen by the box 20. Conversely, in the case of the Figure ld, the vehicle 50 arrives on the two boxes 20 and 30 from the left. In this case, the tires located on the left side of the vehicle 50 will be seen by the housing 20 and the tires located on the right side of the vehicle 50 will be seen by the housing 30. In this case, the system does not know the vehicle. direction of the vehicle, it will not be able to determine which side of the vehicle belong to the tires measured by the two boxes 20 and 30. It will not be possible to specify the side of the vehicle on which a possible maintenance operation must be programmed, for example, because of excessive wear. Figure 2a shows an embodiment of the invention to remedy this problem. In this example, the transverse line of sensors 100, for example wear sensors, is split so that two transverse lines a and b are formed. These two lines a and b also consist of a wear measurement sensor 100. In this example, the total number of sensors arranged along these two lines a and b is identical to the number of sensors that were arranged along the the single transverse line of sensor 100 exposed in the case of Figure lb, and the sensors are arranged in staggered rows. If we imagine that the boxes 20 and 30 of Figure 1d are in accordance with the embodiment of the invention described in Figure 2a, if a vehicle is on the right on the measuring system 11 thus produced, the measurement sensors 100 located on the line b can begin to carry out a measurement before the sensors situated on the line a. Conversely, if a vehicle is on the left of the measurement system 11, the measurement sensors 100 located on the line a can begin to perform a measurement before the sensors located on the line b. In addition, in this example, the processing electronics 111 includes means for determining the elapsed time between the beginning of the measurement on any one of the two sensor lines and the beginning of the measurement on the other. line of sensors. The distance between the line a and the line b being known, it is also possible to measure the speed of the tire by using the time elapsed between the beginning of the measurement by the line b and the beginning of the measurement by the line. at. If necessary, it is sufficient to apply the formula: V = d / t in which V is the speed of the tire whose wear is measured, d is the distance between the two sensor lines a and b and t is the time elapsed between the beginning of the measurement by any of the sensor lines and the beginning of the measurement by the other line of sensors. Alternatively, it is possible to determine the time t by measuring the time elapsed between the end of the measurement by one of the sensor lines and the end of the measurement by the other line of sensors. FIG. 2b shows the evolution of the output voltage 31 of two wear measurement sensors 100 belonging to the sensor line a and the other to the sensor line b of a system according to FIG. the invention. The output signal in continuous line is that of a sensor located on the line a and the output signal in dotted lines and that of a sensor located on the line b.
    [0002] Preferably, the two output signals 31 come from two adjacent sensors. By adjacent sensors is meant a sensor located on a first line and one of the two closest sensors located on the other line. P10-3514_EN -8- 100431 The electronics 111 is equipped with a threshold electronics for detecting the crossing, by the signal, of a voltage threshold indicated at positions 41 and 51 on the signals 31. It is therefore possible to to identify the direction of travel by observing the order in which the output signals of sensors 100, adjacent and each located on two different lines, cross the threshold 41. [0044] Alternatively, it is possible to use the threshold 51, corresponding to the moment when the tire whose wear is measured leaves the measuring zone situated on the case 11, to arrive at the same conclusion. In the case of Figure 2b, we can conclude that these signals were obtained with a vehicle arriving from the left on the wear measuring system 11, because the sensor of the line is activated before the sensor located on line b. In addition, the time t elapsed between the passage of the signal in continuous line by the threshold 41, or 51, and the passage of the dotted signal by the same threshold 41, or 51, corresponds to the time required for the tire passes from sensor line a to sensor line b. As explained above, the gap between the two lines a and b being known, it is this time t that will be used to measure the speed of passage of the vehicle on the system. P10-3514_FR
    权利要求:
    Claims (11)
    [0001]
    REVENDICATIONS1. A system for evaluating the state of a tire, the system comprising a first housing placed on the ground, said system comprising: a first sensor, installed in the housing, and intended to measure a first characteristic of a tire passing over the vehicle; housing, - a second sensor, installed in the housing, and intended to measure a second characteristic of a tire passing on the housing, the first and the second sensors being positioned in such a way that the moments of passage of a vehicle rolling on the case at each of the sensors are distinct, and the system further comprising a control electronics comprising means for determining a running direction of the vehicle on the case according to the positions of each of the sensors in the case and times passing a vehicle on each of the sensors.
    [0002]
    A tire condition evaluation system according to claim 1, wherein the first and second sensors are positioned in the housing so that the projection of their position on the planar upper face of the housing defines a line not orthogonal to the running direction of a vehicle on the housing.
    [0003]
    An evaluation system according to claim 1 or 2, wherein the first and / or second sensors are included in the group consisting of - an eddy current wear sensor, a variable reluctance wear sensor, a laser-based optical wear sensor, pressure sensor, local load sensor.
    [0004]
    4. A system for evaluating the state of a tire according to one of the preceding claims, further comprising a tire presence detection device installed in the housing.
    [0005]
    An evaluation system according to claim 4, wherein the presence detection device uses a single input on the system control electronics. P10-3514_EN- 10 -
    [0006]
    6. Evaluation system according to one of the preceding claims, wherein the presence detection device comprises a sensitive element included in the group comprising - an accelerometer or any type of sensor sensitive to vibration or shock, a magnetometer or any type of sensor sensitive to the variation of terrestrial magnetic field, an extensometer with resistant wires, a piezoelectric buzzer or any system using a piezoelectric composite like a piezoelectric painting.
    [0007]
    7. Evaluation system according to one of the preceding claims, wherein the presence detection device consists of a cavity filled with a fluid, and a pressure sensor or a mechanical contact sensor, implementing a flexible blade.
    [0008]
    8. Evaluation system according to one of the preceding claims, comprising a first group of sensors of the same type as the first sensor, and a second group of sensors of the same type as the second sensor, the sensors of the first group being positioned from in such a way that their orthogonal projections on the flat upper surface of the housing form a first line, and the sensors of the second group being positioned so that their orthogonal projections on the flat upper surface of the housing form a second line, and the first and second lines being distinct and oriented in a direction not parallel to the running direction of a vehicle on the case
    [0009]
    9. Evaluation system according to claim 8, wherein the orientation of the two distinct lines is orthogonal to the running direction of a vehicle on the housing.
    [0010]
    The evaluation system of claim 8 or 9, wherein the sensors of the first and second groups are staggered.
    [0011]
    11. Evaluation system according to one of the preceding claims, comprising a second housing identical to the first, the first and second housings being positioned such that during the passage of a vehicle, the tires located on a first side of the vehicle roll on the first housing, and the tires located on a second side of the vehicle roll on the second housing. P10-3514_FR. A method for determining the direction of travel of a vehicle on a tire condition evaluation system according to one of the preceding claims, said method comprising the following steps: - a step of detecting the crossing of a vehicle; first voltage threshold by the first sensor, - a step of detecting the crossing of a second voltage threshold by the second sensor, - a step of determining the direction of travel according to the positioning of the two sensors and the chronology of the two. previously detected crossings. 13. A method for measuring the speed of a rolling tire on a tire condition evaluation system according to one of claims 1 to 11, the method comprising the following steps: a step of detecting the crossing a first voltage threshold by the first sensor, - a step of detecting the crossing of a second voltage threshold by the second sensor, and - a step of calculating the speed of the vehicle by dividing the distance between the projections. orthogonal positions of each of the sensors on the flat upper face of the case by the time elapsed between the two previously detected crossings. 14. Speed measuring method according to claim 13 wherein the distance between the orthogonal projections is recorded in a memory connected to the control electronics of the system. 15. Speed measuring method according to claim 13 wherein the distance between the orthogonal projections is recorded in a database installed on a remote server, and the calculation of the speed is performed by calculation means associated with the database. . P10-3514_EN 30
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    引用文献:
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    法律状态:
    2015-12-21| PLFP| Fee payment|Year of fee payment: 2 |
    2016-06-24| PLSC| Search report ready|Effective date: 20160624 |
    2016-12-22| PLFP| Fee payment|Year of fee payment: 3 |
    2017-12-21| PLFP| Fee payment|Year of fee payment: 4 |
    2019-09-27| ST| Notification of lapse|Effective date: 20190906 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1462593A|FR3030743B1|2014-12-17|2014-12-17|SYSTEM FOR EVALUATING THE CONDITION OF A TIRE WITH A DEVICE FOR DETECTING THE MEANING SENSE|FR1462593A| FR3030743B1|2014-12-17|2014-12-17|SYSTEM FOR EVALUATING THE CONDITION OF A TIRE WITH A DEVICE FOR DETECTING THE MEANING SENSE|
    US15/535,210| US20170322117A1|2014-12-17|2015-12-11|System for evaluating the condition of a tire, equipped with a device for detecting the direction of travel|
    PCT/EP2015/079460| WO2016096665A1|2014-12-17|2015-12-11|System for evaluating the condition of a tyre, equipped with a device for detecting the direction of travel|
    EP15817124.9A| EP3234542B1|2014-12-17|2015-12-11|System for evaluating the condition of a tyre, equipped with a device for detecting the direction of travel|
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