CN113227750A - Method and system for evaluating tire parameters - Google Patents
Method and system for evaluating tire parameters Download PDFInfo
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- CN113227750A CN113227750A CN201980082981.XA CN201980082981A CN113227750A CN 113227750 A CN113227750 A CN 113227750A CN 201980082981 A CN201980082981 A CN 201980082981A CN 113227750 A CN113227750 A CN 113227750A
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- time data
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- tyre
- tire
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000005259 measurement Methods 0.000 claims description 13
- 230000007613 environmental effect Effects 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 3
- 230000005355 Hall effect Effects 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000004913 activation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000013528 artificial neural network Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013135 deep learning Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/02—Tyres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L17/00—Devices or apparatus for measuring tyre pressure or the pressure in other inflated bodies
- G01L17/005—Devices or apparatus for measuring tyre pressure or the pressure in other inflated bodies using a sensor contacting the exterior surface, e.g. for measuring deformation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/02—Tyres
- G01M17/027—Tyres using light, e.g. infrared, ultraviolet or holographic techniques
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Tires In General (AREA)
Abstract
The present invention relates to a system and a method for evaluating the condition of a tire mounted on a vehicle.
Description
Technical Field
The present invention relates to systems for assessing the condition of a tire, and more particularly to systems for assessing parameters such as wear, deflection or pressure and load of a tire.
It is known that the tread of a pneumatic tire, whether it be fitted to a passenger vehicle, a heavy vehicle, a civil engineering vehicle or another vehicle, is provided with a pattern comprising in particular pattern elements or elementary blocks delimited by various longitudinal, transverse or inclined main grooves, the elementary blocks also being provided with various thinner incisions or sipes. The grooves constitute channels for the water to drain when rolling on wet ground and define the leading edges of the tread elements.
When the pneumatic tire is a new tire, the tread is at its maximum height. This initial height may vary depending on the type of pneumatic tire involved and its intended use; for example, the pattern depth of a "winter" pneumatic tire is generally greater than the pattern depth of a "summer" pneumatic tire. As the pneumatic tire wears, the height of the basic blocks of the pattern decreases and the rigidity of these basic blocks increases. The increase in the rigidity of the tread element causes a reduction in certain performance levels of the pneumatic tire, for example grip on wet ground. In addition, as the pattern channel depth decreases, the drainage ability significantly decreases.
Accordingly, it is desirable to be able to monitor the progress of tread wear of a pneumatic tire.
Furthermore, the deflection of a tire is defined by the radial deformation or change in radial height of the tire as it changes from an unloaded state to a static state under nominal pressure and load conditions. This deflection is referred to as static deflection. The deflection measured during a change in nominal load is called dynamic deflection. The deflection measurements defined in the present invention relate to dynamic deflection.
Deflection measurements are a quantity that is typically used to estimate the severity of the tire operating conditions from a carcass durability perspective. The deflection measurements may also determine tire pressure and/or load. Knowledge of these measurements is useful, particularly for fleet managers or transportation professionals. In particular, in activities where these cost concepts are very important, it is useful to check the correct conditions of use of the tyre, in particular in order to allow a plurality of retreads of the tyre. In particular, running a tire that is overly weakened may cause premature fatigue of the cords that make up the tire carcass, thereby preventing use of the carcass in future retreads. In this way, the replacement of the carcass occurs later, so that the cost price per kilometer of the tire is reduced.
It would therefore seem useful to be able to determine these parameters in a practical and fast manner in the case of managing and maintaining a fleet of tyres.
Background
Thus, according to application WO2016/096662, a system for assessing the condition of a tyre is known, which comprises a box placed on or integrated into a rolling surface and which is able to determine parameters such as the wear or the length of the ground contact surface of the tyre when it rolls on the box. To this end, the housing employs a sensor, such as a hall effect sensor, integrated into the housing.
However, a number of disadvantages have been observed when using this type of tank. Thus, existing systems utilize environmental information to determine tire condition parameters, which is also determined by the system itself. However, certain parameters (e.g., the speed of the tire as it passes through the housing) cannot be determined with sufficient accuracy to ensure that the tire condition parameters are correctly determined.
In addition, existing systems are based on analysis of the output of the hall effect sensor. Fig. 1 shows the time response of such a sensor as the vehicle passes through the tank. In this example, the tire contact patch length is determined by measuring the intersection of a straight line with the sensor response curve. However, as can be seen from the figure, the curves exhibit significant noise. It is therefore not possible to locate the straight line at the lowest point of the curve; therefore, the user of the cabinet must determine the height of the straight line, and this determination is sometimes somewhat unstable, since small variations in the initial parameters may result in large differences in the output results, resulting in distortion of the determination of the ground plane length.
Finally, it has been observed that the computational power of the processors integrated into the prior art cabinets limits the number of operations that can be performed in a given time. Furthermore, the limited size of the associated memory does not allow all data to be stored so as to be able to be used again at a later time.
The present invention is therefore directed to a system and method that overcomes these disadvantages.
Disclosure of Invention
The invention therefore relates to a system for evaluating the condition of a tyre mounted on a vehicle, comprising a housing having an application face intended to come into contact with the surface of the tyre, and a remote server, the housing comprising:
a sensor located in the box and able to evaluate the variation of the radius of curvature of the tyre,
transmitting means for transmitting raw and/or corrected time data originating from the sensor to a remote server,
the system further comprises in the remote server:
receiving means for receiving vehicle environment information originating from an external source,
-calculation means for calculating tire condition parameters from the raw and/or corrected time data and the environmental information.
In one example, the sensor is a hall effect sensor, which enables the distance separating the sensor from the metal reinforcement constituting the tyre to be measured. Thus, measurements taken during passage of the tire can be compared to determine the change in radius of curvature. Other techniques may be used, such as optical distance measuring devices, e.g. laser profilometers, photometers, or light stripe projection, etc.
In an advantageous embodiment, said tire condition parameters are comprised in the group comprising wear profile, deflection measurements, contact patch length, pressure and load.
In another advantageous embodiment, said vehicle environment information is comprised in a group comprising the speed of one or more tires, the thermal drift of one or more sensors.
This information is obtained from a source external to the system that is not the subject of the present invention. Several types of external sources may be considered. Thus, in a first example, the information is obtained from a database comprising, for each tyre, data relating to the thermal drift of the sensor. For example, thermal drift is encountered when the sensor performs measurements within a short time after activation, which is the case in a system according to the invention where the sensor stops between two measurements to save energy. In another example, the speed information may be obtained by any speed determination means: a GPS system of the vehicle, an external radar, etc. In another example, the environmental information obtained by the system according to the invention is not the original information, but the information processed upstream, in order to obtain the best possible accuracy; thus, instead of receiving the speed of one tire, the system may receive speed information corresponding to an average of the speeds of various vehicle tires.
This information, although obtained from an external source, may be generated using raw data originating from the box. Thus, in the example of tire speed: the individual speed of each tire may be determined from the time response of the various sensors included in the housing, and these different speeds may be combined to obtain consolidated speed information, thereby enabling improved accuracy in the subsequent determination of wear and/or deflection. The steps of combining/processing information are not performed in the box, but are performed by a computing device residing in a remote server. In another example, a set of systems may be envisaged, each having speed information sent to the same remote server. All these elements are combined together to reduce the dependence of the determined deflection or wear on measurement errors.
In another advantageous embodiment, the system comprises means in the housing for correcting the time data before transmission. These means may be of various types: filtering means for limiting the noise originating from the hall sensor, or compression or down-sampling means for limiting the amount of information to be transmitted.
The invention also relates to a method for evaluating the condition of a tyre fitted on a vehicle, which is implemented by a system according to the invention, said method comprising the following steps:
the step of recording time data originating from the sensors as the vehicle passes through the tank,
a step of transmitting these data to a remote server,
a step of receiving environmental data originating from an external source,
and determining tire condition parameters based on the time data and the environmental data.
In an advantageous embodiment, said tire condition parameters are comprised in the group comprising degree of wear, deflection measurements, contact patch length, pressure and load.
In another advantageous embodiment, said vehicle environment information is comprised in a group comprising the speed of one or more tires, the thermal drift of one or more sensors.
In a further advantageous embodiment, the determining step comprises the step of comparing the time data with a predetermined chart.
Thus, a system and method can overcome all the disadvantages of the prior art:
by utilizing information originating from an external source to limit reliance on environmental information,
instability in the analysis is limited by using a graph that presents a complete model that is independent of measurement noise from the hall effect sensor. Other means such as expert systems, fuzzy logic, neural networks, deep learning, etc. are also contemplated.
Finally, the problem of the computing power of the processors embedded in the enclosures is eliminated, since most of the computation is outsourced to a remote server, the capacity of which can be increased if needed, without being limited by the hardware constraints of the devices on the rolling surface.
Drawings
Other objects and advantages of the present invention will become more apparent from the following description of a preferred but non-limiting embodiment thereof, illustrated in the accompanying drawings, wherein:
fig. 1, which has been described, shows the time response of a hall sensor integrated into a prior art case.
Figure 2 shows an example of a box of a system according to the invention.
Detailed Description
Fig. 2 shows a vehicle 5, the tires 8 of which roll on a box 6, the box 6 being part of an evaluation system according to the invention. A passenger car is shown in the figure, but such a system can also be used for any other vehicle, such as a heavy vehicle or a bus.
When the tire rolls on the casing 6, the state of wear of the tire 8 is detected without stopping or removing the vehicle. Advantageously, the box 6 is integrated into the rolling surface. In particular, if the case is protruding, the dynamic deflection may change as the vehicle climbs onto the case, which may lead to errors in the deflection determination.
In this embodiment, the housing takes the form of a speed bump for a land vehicle, made of a material suitable to withstand the passage of a plurality of tires without degradation. Such as a compound based on vinyl ester resins, reinforcing glass fibers and various additives known to those skilled in the art.
However, the present invention is not limited to this embodiment, and the case may take any other form of portable object having a planar lower surface that allows positioning on a rolling surface. In a particularly advantageous embodiment, therefore, the surface on which the tank is placed is made of a suitable concrete and a fine mortar layer, so that good flatness can be obtained.
The box comprises an application surface intended to come into contact with the surface of the tyre and at least one sensor located in the box, able to measure the distance separating the sensor from the metal reinforcement constituting the tyre. In one non-limiting example, the case includes a plurality of sensors evenly distributed along a transverse line. In another example, the sensors are staggered along two lines.
Each sensor has, for example, a source of a static or alternating magnetic field, which is a coil or a permanent magnet, and an adjacent sensor element, which is a hall effect sensor, whose output signal can depend, for example, on the level of the local magnetic induction field. In this case, the sensitive element is positioned so that the intensity of the magnetic field varies as the distance d between the metal reinforcement of the tyre and the sensor decreases.
The time output of such a hall effect sensor is shown in fig. 1. In the method and system according to the invention, these time data are transmitted to a remote server in which a computing device capable of processing these data is installed. In an exemplary embodiment, the data may be filtered, compressed, or downsampled prior to transmission. In another exemplary embodiment, the corrected data set is obtained by performing a hierarchical extraction of features from the original data set.
The processing of the data is performed as follows:
the computing device has a chart presenting the wear and deflection according to various parameters related to the vehicle, and/or to the tyre type and/or to the rolling conditions. These charts present a general model describing the longitudinal and transverse curvature of a standard tire crown as a function of tire flexure.
From the time data received from the box, the computing means determine the closest chart and deduce therefrom the most likely flexing and wear.
Claims (8)
1. A system for evaluating the condition of a tyre mounted on a vehicle, the system comprising a housing and a remote server, the housing having an application face intended to come into contact with the surface of the tyre, the housing comprising:
a sensor located in the housing and capable of evaluating the variation of the radius of curvature of the tyre,
transmitting means for transmitting raw and/or corrected time data originating from the sensor to a remote server,
the system further comprises in the remote server:
receiving means for receiving vehicle environment information originating from an external source,
a computing device for computing tire condition parameters from the raw and/or corrected time data and the environmental information.
2. The evaluation system of claim 1, wherein the tire condition parameters are included in the group consisting of wear profile, deflection measurements, ground contact patch length, pressure, and load.
3. The evaluation system of claim 1 or 2, wherein the vehicle environment information is comprised in a group comprising speed of one or more tires, thermal drift of one or more sensors.
4. An assessment system according to any preceding claim, further comprising means in the housing for correcting time data prior to transmission.
5. A method for assessing the condition of a tyre mounted on a vehicle, said method being implemented by a system according to any one of the preceding claims, said method comprising the steps of:
the step of recording time data originating from the sensors as the vehicle passes through the tank,
a step of transmitting these data to a remote server,
a step of receiving environmental data originating from an external source,
and determining tire condition parameters based on the time data and the environmental data.
6. The method of claim 5, wherein the tire condition parameters are included in the group consisting of wear level, deflection measurements, ground contact patch length, pressure, and load.
7. The method of claim 5 or 6, wherein the vehicle environment information is included in a group comprising speed of one or more tires, thermal drift of one or more sensors.
8. The method of any one of claims 5 to 7, wherein the determining step comprises the step of comparing the time data with a predetermined chart.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1873346A FR3090870A3 (en) | 2018-12-19 | 2018-12-19 | Method and system for evaluating tire parameters |
| FR18/73346 | 2018-12-19 | ||
| FR1900879A FR3090871A1 (en) | 2018-12-19 | 2019-01-30 | Method and system for evaluating tire parameters |
| FR19/00879 | 2019-01-30 | ||
| PCT/FR2019/053147 WO2020128323A1 (en) | 2018-12-19 | 2019-12-18 | Method and system for evaluating parameters of a tyre |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113227750A true CN113227750A (en) | 2021-08-06 |
Family
ID=67514721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980082981.XA Pending CN113227750A (en) | 2018-12-19 | 2019-12-18 | Method and system for evaluating tire parameters |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3899484A1 (en) |
| CN (1) | CN113227750A (en) |
| FR (2) | FR3090870A3 (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0722666D0 (en) * | 2006-11-17 | 2007-12-27 | Treadcheck Ltd | Apparatus and method for monitoring tyre wear |
| JP2012162259A (en) * | 2012-03-21 | 2012-08-30 | Technologie Michelin:Soc | Deflection characteristic analysis for tire state |
| US20140316645A1 (en) * | 2011-08-22 | 2014-10-23 | Wheelright Limited | Vehicle Tyre Pressure Checking |
| CN105224711A (en) * | 2014-06-25 | 2016-01-06 | 住友橡胶工业株式会社 | For assessment of the method and system of the wearing and tearing of the axis segmentation tread area of tire |
| WO2016096662A1 (en) * | 2014-12-17 | 2016-06-23 | Compagnie Generale Des Etablissements Michelin | System and method for evaluating the contact area of a tyre |
| CN106255606A (en) * | 2014-05-02 | 2016-12-21 | 米其林企业总公司 | For assessing the system of tire state |
| CN107407693A (en) * | 2014-12-17 | 2017-11-28 | 米其林企业总公司 | System for estimating tire speed |
| CN107438757A (en) * | 2014-12-17 | 2017-12-05 | 米其林企业总公司 | For the method for the under-inflation state for detecting and sending signal prompt tire |
| CN107921830A (en) * | 2015-07-30 | 2018-04-17 | 米其林集团总公司 | System for assessing tire state |
| FR3065075A1 (en) * | 2017-04-07 | 2018-10-12 | Pourang Mahdavi | DEVICE FOR VERIFYING TIRES |
| WO2018220334A1 (en) * | 2017-06-02 | 2018-12-06 | Compagnie Generale Des Etablissements Michelin | Method for providing a service linked to the condition and/or behaviour of a vehicle and/or of a tyre |
-
2018
- 2018-12-19 FR FR1873346A patent/FR3090870A3/en active Pending
-
2019
- 2019-01-30 FR FR1900879A patent/FR3090871A1/en not_active Withdrawn
- 2019-12-18 EP EP19845610.5A patent/EP3899484A1/en active Pending
- 2019-12-18 CN CN201980082981.XA patent/CN113227750A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0722666D0 (en) * | 2006-11-17 | 2007-12-27 | Treadcheck Ltd | Apparatus and method for monitoring tyre wear |
| GB2443965A (en) * | 2006-11-17 | 2008-05-21 | Treadcheck Ltd | Apparatus and method for monitoring tyre wear |
| US20140316645A1 (en) * | 2011-08-22 | 2014-10-23 | Wheelright Limited | Vehicle Tyre Pressure Checking |
| JP2012162259A (en) * | 2012-03-21 | 2012-08-30 | Technologie Michelin:Soc | Deflection characteristic analysis for tire state |
| CN106255606A (en) * | 2014-05-02 | 2016-12-21 | 米其林企业总公司 | For assessing the system of tire state |
| CN105224711A (en) * | 2014-06-25 | 2016-01-06 | 住友橡胶工业株式会社 | For assessment of the method and system of the wearing and tearing of the axis segmentation tread area of tire |
| WO2016096662A1 (en) * | 2014-12-17 | 2016-06-23 | Compagnie Generale Des Etablissements Michelin | System and method for evaluating the contact area of a tyre |
| CN107407693A (en) * | 2014-12-17 | 2017-11-28 | 米其林企业总公司 | System for estimating tire speed |
| CN107438757A (en) * | 2014-12-17 | 2017-12-05 | 米其林企业总公司 | For the method for the under-inflation state for detecting and sending signal prompt tire |
| CN107921830A (en) * | 2015-07-30 | 2018-04-17 | 米其林集团总公司 | System for assessing tire state |
| FR3065075A1 (en) * | 2017-04-07 | 2018-10-12 | Pourang Mahdavi | DEVICE FOR VERIFYING TIRES |
| WO2018220334A1 (en) * | 2017-06-02 | 2018-12-06 | Compagnie Generale Des Etablissements Michelin | Method for providing a service linked to the condition and/or behaviour of a vehicle and/or of a tyre |
Non-Patent Citations (1)
| Title |
|---|
| 无: "普利司通推出轮胎磨损评估技术", no. 02 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3899484A1 (en) | 2021-10-27 |
| FR3090870A3 (en) | 2020-06-26 |
| FR3090871A1 (en) | 2020-06-26 |
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