System and method for measuring load applied to a vehicle axle, method for calibrating the system, and sensing device

Abstract

The present invention relates to a system for measuring load applied to a vehicle axle, a method for measuring load applied to a vehicle axle, a method for calibrating the measuring system, and a device for sensing axle strain. The present invention specifically comprises a solution capable of measuring the load applied to vehicle axles and to the whole vehicle by reading the strain caused to the vehicle axle as a function of forces generated by the loading of the vehicle. The strain-reading device is arranged in an optimised structure that is easy to mount on the vehicle and is configured to prevent interference in the reading of collected data, contributing to improved load measurement. The strain or load values for each axle are sent to a cloud platform, processed and made available to the vehicle driver and / or transport company, so that they can visualise and monitor the weight and distribute the load across the axles according to the measured values. The present invention pertains to the fields of mechanical engineering and measuring systems intended for commercial vehicles.

Description

Descriptive Report of Invention Patent SYSTEM AND METHOD FOR MEASURING LOAD APPLIED TO A VEHICLE AXLE, SYSTEM CALIBRATION PROCESS AND SENSOR DEVICE Field of Invention

[0001] The present invention describes a system for measuring the load applied to a vehicle axle, a method for measuring the load applied to a vehicle axle, a calibration process for the measuring system, and an axle deformation sensor device. Specifically, the present invention comprises a solution capable of measuring the load applied to vehicle axles and to the entire vehicle by reading the deformation suffered by the vehicle axle as a function of stresses generated by the vehicle's load. The deformation reader device is housed in an optimized structure that is easy to mount on the vehicle, which has a configuration that prevents interference in the reading of the collected data, contributing to gains in load measurement.The deformation or load values ​​for each axle are sent to a cloud platform, processed, and made available to the vehicle driver and / or the transport company so they can view and monitor the weight and distribute the load on the axles according to the measured values. This invention falls within the fields of mechanical engineering and metrology applied to commercial vehicles. Background of the Invention

[0002] The freight transport sector plays a crucial role in the economy, carrying goods from the producer to a distribution center or directly to the end consumer. This requires efficient logistics management that takes into account various factors, such as the type and total volume of cargo to be transported, local route peculiarities including legislation and road conditions, as well as the available vehicle models and... their capabilities. All of this aims to ensure compliance with the laws of the regions traveled and the recommendations of the vehicle manufacturers.

[0003] Therefore, in road freight transport, weighbridges are used on highways to check if vehicles are exceeding the load limit established for each vehicle model. This is done to ensure compliance with legislation and increase safety in road freight transport.

[0004] Therefore, the use of onboard load measurement solutions, such as those in road implements, is advantageous. These solutions are capable of measuring or estimating the total vehicle load and / or the load per axle of the vehicle, either during or shortly after loading. This allows predicting whether the vehicle will carry a load within the legal limit for that model and / or within the manufacturer's recommendations, which are generally aligned with legal provisions and with safety and drivability factors.

[0005] Furthermore, there are solutions that measure pressure in the pressure lines to calculate the total load or the load per axle. These systems aim to optimize load distribution and prevent vehicle rollover.

[0006] For this, efficient load measurement in commercial vehicles is essential, using simpler solutions that reduce the number of components and facilitate the assembly and manufacturing of the solution installed in the vehicle. This also makes load measurement more reliable due to ease of maintenance and verification.

[0007] In the search for the state of the art in scientific and patent literature, documents were found that address the topic:

[0008] The patent application BR 102023008773-6 presents an onboard weighing solution, that is, a technology for measuring the load applied to each axle of the vehicle in contact with the ground and / or the total load applied to the vehicle. The solution presented by BR 102023008773-6 is associated with the vehicle's air suspension, reading the air pressure and converting it into weight. The present invention, on the other hand, does not depend on... Pneumatic pressure reading, as it allows for direct reading of the mechanical deformation of the vehicle's axle to measure the applied load.

[0009] Patent DE102020215498B4 discloses a load sensor fixed to a vehicle axle. For this purpose, the bridge-shaped load cell is fixed between two pairs of plates at each end of the bridge, defining the sandwich sensor. Each support has two holes for screws. Furthermore, the sensor's strain gauges receive a sealing resin. A plastic housing contains the sensor and its electronic circuit, which is connected to an external medium via cabling. Unlike the solution in the present patent, DE 102020215498B4 places the electronic circuit above the sensor bridge and fixes the assembly to the vehicle axle by means of screws, while the present invention does not drill holes in the axle and houses the electronic circuit between the "bridge" and the axle, resulting in improved circuit protection, optimized space occupied by the sensor, and improved reading quality, while preserving the integrity of the components.

[0010] Patent RU2786759C1 presents a sandwich-type base surrounding the sensor, which receives an inverted T-shaped housing made of polyamide. The housing is fixed by screws that reach plates positioned below the sensor. These plates are soldered to the object to be measured, for example, a vehicle axle. Unlike the present invention, the electronic circuit is positioned above the sensor, and the parts of the sandwich base are joined by soldering or riveting. Thus, the present invention offers, compared to this prior invention, gains in circuit protection, optimization of the space occupied by the sensor, and improved reading quality, while preserving the integrity of the components.

[0011] Application W02020120229A1 discloses a deflection sensor for a component, for example, a vehicle axle. Like DE102020215498B4 and RU2786759C1, the sensor in W02020120229A1 also features a sandwich design, being enclosed by a pair of plates on each side. W02020120229A1 describes the sensor as having a pre-bend as a A way to amplify the generated signal. Thus, the present invention, compared to the prior art, offers gains in circuit protection, optimization of the space occupied by the sensor, and improved reading quality, while preserving the integrity of the components.

[0012] US patent 7478001 B2 presents a thermal compensation method that proposes the statistical calculation of an average value of compensation factors for temperature variation from multiple sensors. On the other hand, the thermal compensation proposed by the present invention refers to a single sensor, and not multiple sensors, being performed for each axle of the vehicle, and is optimized so as not to require multiple statistical variables.

[0013] Patent EP 3795959 B1 discloses a method for calibrating an embedded system for measuring vehicle load using a self-learning algorithm. To this end, the method performs three stages of load and temperature measurements: i) empty and stationary vehicle; ii) loaded and stationary; iii) loaded and in motion. The present invention, on the other hand, does not need to perform measurements with the vehicle in motion, being primarily intended to measure the load with the vehicle stationary. In this way, in addition to reducing local processing, the present invention also provides lower energy consumption and lower bandwidth consumption for data traffic in communication with the data processing and presentation platform, also preventing false values ​​from being presented due to suspension dynamics, since the system's focus is not on measuring dynamic loads; these are considered disturbances or false measurements.

[0014] Patent application DE102022208065 presents a method for calibrating a weight detection device attached to a vehicle axle. To this end, the method proposes the use of an automotive lift to raise at least one axle, relieving the load on it. Thus, the lift does not act on the axles, but rather on the vehicle's structure / body. The method then performs an initial measurement stage with one or more axles suspended. Subsequently, with the vehicle on the ground, measurements are taken with the vehicle unloaded and... with a known load. Thus, these measurements are used for calibration along with temperature compensation. The present invention, on the other hand, performs measurements directly on the vehicle axle, without the need to act on the vehicle body or structure.

[0015] Thus, based on the literature reviewed, no documents were found that anticipated or suggested the teachings of the present invention, so the solution proposed here has novelty and inventive activity compared to the state of the art.

[0016] In this context, the previous technique lacks solutions for estimating the load transported by road vehicles using a smaller number of components, focusing on simplifying the reading of the parameters necessary for load calculation, thus reducing manufacturing and maintenance costs. Summary of the Invention

[0017] Thus, the present invention solves the problems of the prior art by providing a load measurement system capable of reading the deformation suffered by the vehicle axle as a function of the forces generated by the vehicle's load, where the data generated by the reading are used to determine the load being transported and / or the load applied to each axle of the vehicle.

[0018] An object of the present invention is a load measurement system applied to a vehicle axle (10), said system comprising a device (11) for axle deformation (10) associated with the axle (10) and a cloud platform associated with the vehicle, wherein said device (11) generates data based on the deformation suffered by the axle (10), said data being sent to the cloud platform, wherein said cloud platform processes the data generated based on the deformation suffered by the axle (10), considering a temperature value relative to the axle (10), and provides a value of the load applied to the axle (10) of the vehicle.

[0019] In another object, the present invention provides a method of A method for measuring the load applied to an axle (10) comprising a device (11) that sensing the deformation of the axle (10) and a cloud platform associated with the vehicle, the said method comprises the steps of: reading a temperature relative to the axle (10); reading the deformation of the axle (10) by the device (11) and providing data as a function of the deformation; receiving the temperature data and data as a function of the deformation by a cloud platform; processing, in the cloud, the data generated as a function of the deformation of the axle (10), considering a temperature value relative to the axle (10); and providing a value of the load applied to the axle (10) of the vehicle.

[0020] In another object, the present invention presents a process for calibrating a load measurement system applied to a vehicle axle (10) comprising a device (11) that sensing axle deformation (10) and a cloud platform associated with the vehicle, further comprising the step of generating at least one physical parameter coefficient ( / -) as a function of physical properties of the vehicle, system components or assembly, comprising the steps of: determining a physical parameter coefficient (Kf) intended to calibrate reading variations arising from the production of the device (11), which corresponds to the sensor calibration coefficient (K a ) and is determined as a function of the device (11); determination of a physical parameter coefficient ( / -) intended to correct reading variations arising from the shaft (10) and device (11) pair, which corresponds to the sensor calibration coefficient (K b) and is determined as a function of the device (11) and the axis (10); determination of a physical parameter coefficient ( / -) intended to correct reading variations arising from temperature variation relative to the axis (10), which corresponds to the thermal compensation coefficient (K t ) and is determined based on the device (11) and the axle (10); and determination of a physical parameter coefficient ( / -) intended to correct reading variations arising from the fixing of the device (11) on the axle (10), the axle (10) on the vehicle and physical parameters of the vehicle itself, which corresponds to the tare coefficient (K o ), and is determined based on the axis (10), the device (11) and the vehicle, where the tare coefficient (K o ) is variable, allowing for system recalibration.

[0021] In another object, the present invention provides a vehicle axle (10) deformation sensor device (11) comprising at least one deformation reader (1) associated with the center of a sensitive geometry (6) of the device (11) and at least one support (5) for fixing the device (11) to the axle (10), said sensitive geometry (6) being an elongated plate whose distal ends have through holes intended for receiving fastening elements (9) with the support (5), and also having a microcontroller circuit (7) associated with the deformation reader (1) and a power source (4).

[0022] These and other objects of the invention will be immediately appreciated by those skilled in the art and will be described in detail below. Brief Description of the Figures

[0023] The following figures are presented:

[0024] Figure 1 shows an exploded view of an embodiment of the association elements of the strain sensor device (11) of the present invention.

[0025] Figure 2 shows a bottom perspective view of the embodiment of the device (11) illustrated by Figure 1.

[0026] Figure 3 shows a preferred embodiment of the sensitive geometry (6) of the device (11) presented in isolation.

[0027] Figure 4 shows another embodiment of the device (11) of the present invention, comprising an arched structure and a through hole at each end.

[0028] Figure 5 shows an embodiment of the positioning of the strain gauges (1) fixed to the sensitive geometry (6) of the device (11) of the present invention.

[0029] Figure 6 shows another embodiment of the sensible geometry (6) of the present invention comprising an arched structure and an oblong hole in each end.

[0030] Figure 7 shows another embodiment of the sensible geometry (6) of the present invention comprising an arched structure and two circular holes at each end.

[0031] Figure 8 shows another embodiment of the sensible geometry (6) of the present invention comprising an arched structure and a conical hole at each end.

[0032] Figure 9 shows another embodiment of the support (5) of the present invention associated with an embodiment of the sensitive geometry (6) of the present invention comprising an arched structure and a hole at each end for fixing with a Huck Bolt type fastening element (9).

[0033] Figure 10 shows an embodiment of the circuit board comprising a microcontroller (7) powered by a power source (4) and connected to the deformation reader (1) of the sensitive geometry (6).

[0034] Figure 11 shows a bottom view of an embodiment of the device (11), illustrating the circuit board mounted below the sensitive geometry (6) and the housing (8) enclosing the device (11).

[0035] Figure 12 shows an embodiment of the support (5) fixed to the shaft (10).

[0036] Figure 13 shows four different embodiments of the sensitive geometry (6) fixed to the support (5) positioned on distinct axes (10), where each sensitive geometry (6) is fixed to the support (5) by means of different fastener techniques that are associated with different through-hole geometries of the sensitive geometry (6).

[0037] Figure 14 shows an embodiment of the device (11) of the present invention, revealing the sensitive geometry (6), the power source (4) and the housing (8), where the arrows at the ends of the device (11) illustrate the pre-calibration by tension and compression, for generating the sensor calibration coefficient (K).a ).

[0038] Figure 15 shows a realization of the beam-axis calibration of the device (11) when it is fixed to the shaft (10), adding load and by observing the response values ​​read, for the generation of the sensor calibration coefficient (K) b At this point, the temperature is also measured to generate the thermal compensation coefficient (K). t ).

[0039] Figure 16 shows another embodiment of the calibration of the device (11) when it is fixed to the shaft (10), this step being performed with the shaft (10) already associated with the vehicle. In this step, load is added to the vehicle and the response values ​​read are observed, to generate the sensor calibration coefficient (K). b At this point, the temperature can also be measured to generate the thermal compensation coefficient (K). t ).

[0040] Figure 17 shows a concrete example of the step for obtaining the tare coefficient (K). o ) to compensate for any difference in measurement resulting from the fixing of the device (11) to the shaft (10), the shaft (10) to the vehicle and physical parameters of the vehicle itself, such as its own weight.

[0041] Figure 18 shows a first embodiment of the system of the present invention, in which at least one device (11) fixed to an axle (10) of the vehicle sends signals to the vehicle control unit, which condenses these signals and shares them with the cloud platform for information processing and provision of axle load and total load values. In this embodiment, K o is obtained with each axle (10) + device (11) pair already associated with the vehicle.

[0042] Figure 19 shows a second embodiment of the system of the present invention, in which at least one device (11) fixed to an axle (10) of the vehicle sends signals to the vehicle control unit, which condenses these signals and shares them with the cloud platform for information processing and provision of axle load and total load values. In this embodiment, K o is estimated before each axle (10) + device (11) pair is associated with the vehicle, so that K o is obtained in the same step as obtaining Detailed Description of the Invention

[0043] The descriptions that follow are presented by way of example and are not limiting to the scope of the invention, and will provide a clearer understanding of the subject matter of this patent application.

[0044] The present invention is capable of measuring the deformation suffered by the axle (10) of a vehicle as a function of the stresses generated by the vehicle load, this measurement being made in an optimized and direct way and, based on these measurements, it is able to determine the total load carried by the vehicle, as well as the load on each axle of the vehicle.

[0045] More specifically, the present invention discloses a solution for measuring the load to which at least one vehicle axle (10) is subjected, this axle (10) being equipped with readers, at least one strain sensor capable of detecting the deformation suffered by the vehicle axle as a function of stresses generated by the vehicle load, wherein the data generated by the strain reading are sent and concentrated in the vehicle's ECUA / CU and shared with a cloud processing platform. Thus, the data are used to determine the total load transported and / or the load applied to each axle of the vehicle. Furthermore, the generated values ​​of total load transported and / or load applied to each axle are made available in a load value visualization interface so that the vehicle driver and / or the transport company (fleet management) can view the values ​​remotely from the vehicle.

[0046] For the purposes of the present invention, the vehicle to which the proposed solution is associated is at least one land transport vehicle including: automobile, bus, truck, trailer, tractor unit, trailer, semi-trailer or other category of road implement, agricultural implement, CVC (Combination of Cargo Vehicles), railway wagon or any land vehicle for transporting cargo and / or passengers that has at least one axle (10) on which it is desired to determine the load being applied to determine the weight transported by the vehicle. In a preferred embodiment and in a non-specific manner In a limiting sense, the vehicle of the present invention is realized as a road implement in such a way that, in order to comply with legal standards and safety parameters, it is desired to determine the load being transported per axle (10) of the vehicle in contact with the ground and / or the total load being transported by the vehicle, so that the solution proposed here allows such information to be identified in a practical and efficient manner.

[0047] In a first object, the present invention presents a load measurement system applied to a vehicle axle (10), said system comprising a device (11) for axle deformation (10) associated with the axle (10) and a cloud platform associated with the vehicle, wherein said device (11) generates data based on the deformation suffered by the axle (10). This data is sent to the cloud platform, so that said cloud platform processes the data generated based on the deformation suffered by the axle. (10), considering a temperature value relative to the shaft (10), and provides a load value applied to the shaft (10) of the vehicle.

[0048] The strain sensor device (11) is capable of capturing the mechanical deformation suffered by the vehicle axle (10) as a function of stresses generated by the vehicle load. The data relating to the deformation are then transmitted to the vehicle. The vehicle gathers the data sent by all devices (11) and sends it to a cloud platform that processes this data and provides a load value per axle and total vehicle load as a function of the number of axles in contact with the ground. In one embodiment, the device (11) is equipped with at least one strain gauge reader (1), which is implemented as a strain gauge or any equivalent elastic strain sensor that produces a signal.

[0049] The device (11) communicates with a vehicle control center, such as, but not limited to, the vehicle's VCU / ECU. In a preferred embodiment, the device (11) comprises a wired connection to the vehicle, as illustrated in Figure 2. In another embodiment, the device (11) comprises wireless communication with the vehicle, such as Figures 4, 10 and 11 illustrate the embodiments. The wired connection has advantages compared to the wireless connection, as it eliminates the need for an autonomous power source (4) for the device (11), so that the power for its operation is supplied by the vehicle via cable, as well as allowing a reduction in the size of the device's electronic circuit (11), making it more compact, facilitating its assembly and reducing manufacturing costs.

[0050] In one embodiment, the system of the present invention has at least one physical parameter coefficient ( / -), this coefficient being generated during the system's pre-calibration based on physical properties of the vehicle, system components, or assembly. For the purposes of the present invention, physical parameters include, but are not limited to: mechanical deformation; temperature; stress concentrations arising from the assembly / manufacturing of components; among others.

[0051] In one embodiment, the system of the present invention has at least one physical parameter coefficient ( / -) corresponding to a sensor calibration coefficient (K a ), determined based on the device (11) and is intended to calibrate reading variations arising from the production of the device (11).

[0052] After the production of the strain sensor device (11), it undergoes tensile and compressive stress tests for calibration. The device (11) is subjected to controlled stresses and its response is read. Through these tests, a sensor calibration coefficient (K) is generated. a In a preferred embodiment, all devices (11) used in the present invention undergo this pre-calibration and, in this way, each device (11) comprises a K a own, which is stored in its circuit.

[0053] In a preferred embodiment, each device (11) performs self-addressing, identifying itself to the vehicle along with its K a In this way, the vehicle's VCU / ECU groups data for each axle (10), such as its position along the vehicle and the coefficients of each device (11) and of each axle.

[0054] In one embodiment, the system of the present invention presents to minus a physical parameter coefficient ( / -) corresponds to a sensor calibration coefficient (K b ) determined as a function of the device (11) and the axis (10), where the coefficient (K b This is intended to correct reading variations arising from the shaft (10) and device (11) pair. Thus, after the device (11) is connected to the shaft (10), the shaft (10) + device (11) pair is calibrated on a bench, where predefined forces are applied to the shaft to produce a new calibration coefficient K. b In one embodiment, the calibration coefficient K b is memorized by the microcontroller (7) of the device (11) associated with the shaft (10). In another embodiment, the coefficient K b The vehicle's VCU / ECU is informed along with the axle identification data (10), such as its position along the vehicle, so that it can be identified. In another embodiment, the K coefficient bIt is reported directly to the cloud platform along with the axle (10) and vehicle identification data, such as vehicle model, axle (10) position in the vehicle and device data (11), such as its K a so that they can be identified.

[0055] In one embodiment, the system of the present invention has at least one physical parameter coefficient ( / -) corresponding to a thermal compensation coefficient (K t ), determined as a function of the device (11) and the axis (10). The coefficient K t It is intended to compensate for deviations in readings of shaft deformation (10) resulting from expansion or contraction caused by variations in shaft temperature (10).

[0056] For the purposes of the present invention, the coefficient K tThe value of K was determined experimentally and is defined as a function of the material of the sensitive geometry (6), which promotes the fixing of the device (11) to the shaft (10), as well as as a function of the material of the shaft (10). Thus, when the material of the device (11) and the shaft (10) is indicated, the value of K is selected. t experimentally identified by the inventors.

[0057] For illustrative purposes, it was found that the temperature-related drift effect exists due to the difference in materials from which the shaft (10) and the support (5) for fixing the device (11) to the shaft (10) are manufactured. (e.g., carbon steel) and the material from which the elastic body of the device (11), i.e., its sensitive geometry (6), is made (e.g., stainless steel). Thus, considering a device (11) with a compatible volume, the value must remain the same and this factor K tit will be considered constant for all pairs of device (11) and shaft (10) of the same material.

[0058] In order to obtain the calibration coefficient K t , a reference temperature is used. This temperature corresponds to the temperature of the shaft (10) or the environment in which the shaft (10) is inserted at the time of calibration to obtain the K coefficient. b Therefore, both coefficients K b and K t are obtained in the same step and as a function of physical properties of the shaft (10) + device (11) pair.

[0059] In one embodiment, the system of the present invention has at least one physical parameter coefficient ( / -) corresponding to a tare coefficient (K o), determined as a function of the shaft (10), the device (11) and the vehicle, and is intended to correct reading variations arising from the fixing of the device (11) to the shaft (10), the shaft (10) to the vehicle and physical parameters of the vehicle itself. For example, fixing the device (11) to the shaft (10) generates an accumulation of mechanical stresses, which are compensated by the coefficient K o The coefficient K o It also makes it possible to disregard the vehicle's own weight without load, eliminating the offset generated by fixing the device (11) to the axle (10) and the axle (10) to the vehicle. The coefficient K o It is stored on the cloud platform and used to correct the strain reading value read by the device.

[0060] In one embodiment, the tare coefficient (K o ) is variable, allowing for system recalibration. In one embodiment, the coefficient K ois the only coefficient that can be varied on the cloud platform, with the other coefficients being maintained for each device (11) and for each device (11) + axis (10) pair.

[0061] Thus, for the purposes of the present invention, the load value applied to each axle (10) of the vehicle is calculated on the cloud platform according to the following formula:

[0062] In the formula above, the value of Z is the value of the load being applied to the shaft (10), in kilograms. The coefficient K b It is obtained during the calibration of the device (11) shaft (10) pair, at the same time as the K coefficient is obtained. t and the temperature at the time of calibration T calibraçã0 The coefficient K a is obtained during the calibration of the device (11) when it is produced and the value of X is the value of the deformation read by the device (11) at the same time or at a time sufficiently close to the time when the temperature reading T ieiturais collected. The coefficient K o This corresponds to the tare weight or offset of the system.

[0063] In one embodiment, the system comprises a device for reading the temperature T. ieitura from the axis (10) next to the device (11), which is sent to the vehicle and then to the cloud platform. In another embodiment, the vehicle comprises a temperature reading device that reports the temperature T ieitura to the cloud platform. In another embodiment, the cloud platform accesses meteorological data and / or receives data equivalent to the temperature relating to the axis (10) or the environment in which the axis is located in order to compensate for the temperature variation.

[0064] In one embodiment, the device (11) is able to convert the strain data read by its strain reader (1) into applied load data, using the correction factor K. aThis value is provided to the vehicle and subsequently sent to the cloud platform, which considers the K values. a K b and K o and temperatures to determine the load value on the shaft. In this embodiment, the device (11) does not need to provide the value of K. a to the vehicle or the cloud, since it already provides the final K data. a X in Newtons.

[0065] In one embodiment, the cloud platform comprises a predefined load value for each axle (10) which is used as a reference to identify whether the axle is raised or in contact with the ground. For the purposes of this example, this value corresponds to zero.

[0066] Thus, if the device reading (11), after being processed by the cloud platform, provides negative load values, the platform in The cloud is programmed to interpret that this shaft (10) is suspended and therefore not in contact with the ground, informing a user that the shaft (10) is raised or there is zero load on that shaft (10).

[0067] On the other hand, if the calculation of the signal sent from the vehicle to the cloud platform, originating from the device (11), results in a positive load value, the cloud platform is programmed to provide this load value applied to the axle (10) that was identified as associated with the device (11). Thus, the cloud platform informs the user of the position of the axle (10) in the vehicle and the load value applied to that axle (10).

[0068] To determine the total load applied to the vehicle, the cloud platform only considers the axles (10) that are in contact with the ground and is thus able to provide the average load value per axle (10) and the total load value on the vehicle (sum).

[0069] In one embodiment, the cloud processing platform communicates with a load value visualization interface, allowing the determined load values ​​to be made available to the vehicle operator / driver and / or to the transport company and fleet managers for monitoring the load weight.

[0070] In a second object, the present invention presents a method for measuring the load applied to an axle (10) comprising a device (11) that sensing the deformation of the axle (10) and a cloud platform associated with the vehicle, said method comprising the steps of: reading a temperature relative to the axle (10); reading the deformation of the axle (10) by the device (11) and providing data as a function of the deformation; receiving the temperature data and data as a function of the deformation by a cloud platform; processing, in the cloud, the data generated as a function of the deformation of the axle (10), considering a temperature value relative to the axle (10); and providing a value of the load applied to the axle (10) of the vehicle.

[0071] For the purposes of the present invention, the temperature relative to the shaft (10) refers to the temperature of the shaft (10) or of a region close to the shaft (10) which enables The system of the present invention compensates for the temperature variation between the moment when the shaft (10) + device (11) pair was calibrated and the temperature of the shaft (10) at the moment the deformation reading is being performed by the device (11). Thus, it is possible to disregard the deformation caused by thermal contraction or expansion.

[0072] In one embodiment, the step of reading a temperature relative to the shaft (10) is performed by at least one of the following: a temperature sensor next to the device (11); next to the shaft (10); in the vehicle or a temperature reading source external to the vehicle.

[0073] In one embodiment, the reading of the deformation of the shaft (10) is performed by the device (11), which considers the coefficient K. a and provides the vehicle with a preliminary axle load data (10), already calculated as a function of the multiplication of the coefficient K awith the strain value read by the strain readers (1) of the sensitive geometry (6). This load value on the shaft (10) is preliminary, as it disregards information from the shaft (10) relating to the K coefficients. b K t and K o , with this information being considered in the calculation subsequently performed by the cloud platform. In another embodiment, the device (11) provides the vehicle, separately, with the K coefficient. a and the deformation data read, this data is related to the axis (10) to which the device (11) is associated and sent to the cloud platform so that it can calculate the final load value on the axis (10), without the need for the device (11) to perform the calculation of a preliminary load value.

[0074] In one embodiment, the method of the present invention comprises at least one preliminary calibration step, which generates at least one coefficient of physical parameters ( / -) as a function of physical properties of the vehicle, system components, or assembly.

[0075] In one embodiment, the method of the present invention comprises a preliminary calibration step of a physical parameter coefficient ( / -) corresponding to at least the step of determining a sensor calibration coefficient (K). a ), determined based on the device (11), which It is intended to calibrate reading variations arising from the production of the device (11).

[0076] In one embodiment, the method of the present invention comprises a preliminary calibration step of a physical parameter coefficient ( / -) corresponding to at least the step of determining a sensor calibration coefficient (K). b) determined as a function of the device (11) and the axis (10), where the coefficient (K b ) is intended to correct reading variations arising from the shaft (10) and device (11) pair. The coefficient K b is assumed based on the shaft model (10), the device model (11) and the material that is used to produce them.

[0077] In one embodiment, the method of the present invention comprises a preliminary calibration step of a physical parameter coefficient ( / -) corresponding to at least the step of determining a thermal compensation coefficient (K). t ), determined as a function of the device (11) and the axis (10), where the coefficient (K t ) is intended to correct reading variations arising from temperature variation relative to the axis (10). The coefficient K fIt is assumed based on the shaft model (10), the device model (11) and the sensitive geometry material (6) used to produce them and is intended to eliminate from the reading the deformation caused by temperature variation, i.e., thermal expansion and contraction.

[0078] In one embodiment, the method of the present invention comprises a preliminary calibration step of a physical parameter coefficient ( / -) corresponding to at least the step of determining a tare coefficient (K). o ), determined based on the axis (10), the device (11) and the vehicle, intended to correct reading variations resulting from the device's fixation. (11) on axis (10), of axis (10) in the vehicle and of physical parameters of the vehicle itself. In a preferred embodiment, the coefficient K ocorresponds to the tare or offset of the vehicle after the device (11) is already associated with the axle (10) and the axle (10) with the vehicle, considering data such as the vehicle's own weight and thus eliminating the values ​​of stress accumulations caused by the fixing of elements in relation to each other.

[0079] In one embodiment, the tare coefficient (K o The value of K is variable, allowing for system recalibration. As the system and method of the present invention are repeatedly used, fatigue of some components and / or interference in readings may occur due to intrinsic use. Thus, periodically, the present invention can undergo a recalibration step, where the vehicle is positioned on a ground scale and a controlled load is placed on the vehicle, allowing the cloud platform to correct / update the K value. o .

[0080] In one embodiment, when the method or system of the present invention identifies anomalous readings or readings outside of a predefined pattern, the cloud platform itself informs the user of the need to recalibrate the present invention.

[0081] In one embodiment, the method of the present invention comprises, on the cloud platform, the steps of: comparing the load applied to the axle (10) in relation to a predefined load value. If the load value on the axle (10) is less than the predefined value, the axle (10) of the vehicle is suspended. If the load value on the axle (10) is greater than or equal to the predefined value, the axle (10) of the vehicle is in contact with the ground. Thus, the cloud platform performs the calculation of the total load applied to the vehicle as a function of the number of axles in contact with the ground, in addition to providing the load value per axle on the ground.

[0082] In a third object, the present invention presents a process for calibrating a load measurement system applied to a vehicle axle (10) comprising a device (11) that sensing axle (10) deformation and a cloud platform associated with the vehicle, further comprising the step of generating at least one physical parameter coefficient ( / -) as a function of physical properties of the vehicle, system components or assembly, comprising the steps of: determining a physical parameter coefficient (Kf) intended to calibrate reading variations arising from the production of device (11), which corresponds to the sensor calibration coefficient (K a ) and is determined as a function of the device (11); determination of a physical parameter coefficient ( / -) intended to correct reading variations arising from the shaft (10) and device (11) pair, which corresponds to the sensor calibration coefficient (K b) and is determined as a function of the device (11) and the axis (10); determination of a physical parameter coefficient ( / -) intended to correct reading variations arising from temperature variation relative to the axis (10), which corresponds to the thermal compensation coefficient (K t ) and is determined based on the device (11) and the axle (10); and determination of a physical parameter coefficient ( / -) intended to correct reading variations arising from the fixing of the device (11) on the axle (10), the axle (10) on the vehicle and physical parameters of the vehicle itself, which corresponds to the tare coefficient (K o ), and is determined as a function of the axle (10), the device (11) and the vehicle, where the tare coefficient (K o ) is variable, allowing for system recalibration.

[0083] In one embodiment, the process of the present invention comprises the embodiment illustrated by Figure 18, where the device assemblies (11) and axles (10) are mounted on the vehicle and subsequently the calibration is finalized during the final assembly of the vehicle, with the vehicle on a ground scale, providing precise K values. o .

[0084] In one embodiment, the process of the present invention comprises the embodiment illustrated by Figure 19, where the value of K o It is estimated on the bench, along with the calibration of the K factors. b and K t For this to happen, the value of K o It is less precise than in the embodiment illustrated by Figure 18, but it is sufficiently satisfactory and capable of providing load values ​​extremely close to the real values. Furthermore, the value of K o It can be recalibrated over time, thus eliminating any inaccuracies resulting from estimating K. o .

[0085] Once the device (11) is produced, it undergoes tensile and compression tests with controlled load to obtain a K value. a suitable for that device (11). In a preferred embodiment, 100% of devices (11) go through the calibration stage.

[0086] Now for the value of K b , part of the axes (10) of a batch is tested on a bench, so that the value of K b It is an average value obtained and then reproduced for all pairs of shaft (10) and device (11) of that batch, bringing productivity gains to the present invention. It should be noted that any inaccuracies in the estimation of K b They are also corrected by means of K. o .

[0087] In one embodiment, the process of the present invention further comprises the steps of: associating at least one strain gauge (1) with at least one sensitive geometry (6); connecting a microcontroller (7) with the strain gauge (1); associating at least one power source (4) with the microcontroller (7); associating a housing (8) with the sensitive geometry (6) and over the strain gauge (1), the power source (4) and the microcontroller (7), forming a strain sensor device (11); connecting the microcontroller (7) with a processing platform; and fixing, by means of fastening elements (9), the sensitive geometry (6) to at least one axle (10) of the vehicle by means of a support (5).

[0088] In a preferred embodiment, the device circuit (11), together with its microcontroller (7), are housed between the sensitive “bridge”-shaped geometry (6) and the shaft (10) and enclosed by the housing (8). Furthermore, the supports (5) also represent a physical barrier to protect the device circuit (11). In this way, the device (11) is more compact than solutions of the prior art and also presents greater durability and reliability in the readings resulting from the mechanical protection generated by its mounting arrangement.

[0089] This configuration brings benefits to the calibration process. Furthermore, the technique of fixing the device (11) to the shaft (10) also results in stress accumulation in the device (11), so the most appropriate selection of fixing technique brings benefits in reading and calibration.

[0090] In a preferred embodiment, the sensible geometry (6) is flat or straight and has two vertical through holes at each end. longitudinal. In another embodiment, the sensitive geometry (6) is manufactured with an arched geometry and drilled to present through holes at its ends. In one embodiment, the through holes are two holes at each end for association with screws. In another embodiment, the through holes are a conical hole at each end for association with screws. In another embodiment, the through holes are one hole at each end and fixed with a fastening element (9) of the riveted plate type (Huck Bolt). In another embodiment, the through holes are oblong holes for association with screws.

[0091] In one embodiment, the process of the present invention comprises a step connecting the microcontroller (7) to at least one temperature reader and / or a vehicle control unit, wherein the microcontroller (7) receives at least one temperature value from the temperature reader and / or vehicle control unit. In one embodiment, the temperature reader is a temperature sensor positioned on the shaft that collects the shaft temperature (10). In one embodiment, the vehicle control unit is the vehicle's ECU / VCU, which receives shaft temperature values ​​from vehicle monitoring systems. Thus, the microcontroller (7) can receive shaft temperature values ​​from either the vehicle control unit or temperature readers, or both.

[0092] Furthermore, in a preferred embodiment, the microcontroller (7) is connected via a wiring harness to the vehicle's ECU / VCU. In another embodiment, the microcontroller (7) is connected wirelessly to the vehicle's ECU / VCU, which communicates with a processing platform that receives and processes the deformation and temperature values ​​from the microcontroller (7). In one embodiment, said processing platform is a remote cloud-based control unit that calculates the load value applied to each axle (10) in contact with the ground and / or the total load value carried by the vehicle using a mathematical equation that includes coefficients and the values ​​of deformation and / or temperature in the calculation.

[0093] Thus, the steps described above form a strain sensor device (11) with optimized and simplified geometry for attachment to the shaft (10). In one embodiment, the sensitive geometry (6) is attached to the shaft (10) by means of a support (5). In another embodiment, the support (5) is attached to the shaft (10) and the sensitive geometry (6) is attached to the support (5) via through holes.

[0094] In a fourth object, the present invention provides a vehicle axle (10) deformation sensor device (11) comprising at least one deformation reader (1) associated with the center of a sensitive geometry (6) of the device (11) and at least one support (5) for fixing the device (11) to the axle (10), said sensitive geometry (6) being an elongated plate whose distal ends have through holes intended for receiving fastening elements (9) with the support (5), and also having a microcontroller circuit (7) associated with the deformation reader (1) and a power source (4).

[0095] In one embodiment, the device of the present invention comprises a geometry for preventing variations in readings and mitigating calibration, wherein the microcontroller circuit (7) is housed between the shaft (10) and the sensitive geometry (6) with the deformation readers (1), the controller circuit (7) being further surrounded by the support (5) and housed in a housing (8) that covers at least part of the device (11).

[0096] In one embodiment, the device (11) of the present invention comprises at least one strain gauge (1) intended to capture the strain suffered by the vehicle axle (10), which collects the strain value suffered by the axle (10). In one embodiment, the strain gauge (1) is a strain gauge. In one embodiment, the strain gauge (1) is associated with a sensitive geometry (6) of the device (11), which is fixed to the axle (10) by means of at least one support (5). In a more specific embodiment, the strain gauge (1) is associated in the central region of the sensitive geometry (6).

[0097] In a preferred embodiment, the sensitive geometry (6) is planar. In another embodiment, the sensitive geometry (6) comprises arched geometry. In one embodiment, the sensitive geometry (6) is associated with a support (5), which is fixed to the axis (10). In this way, the support (5) performs the connection interface between the sensitive geometry (6) and the axis (10).

[0098] In a preferred embodiment, the support (5) comprises a parallelepiped geometry and has two threaded holes on its upper face. The lower part of the support (5) is fixed to the shaft (10), for example, by welding. The upper part of the support receives one end of the sensitive geometry (6), so that the through holes of the sensitive geometry (6) are aligned with the holes of the support (5). The device (11) further comprises a plate (2) disposed above the end of the sensitive geometry (6), the plate (2) also having at least one through hole that aligns with the hole of the sensitive geometry (6). The purpose of the plate (2) is to provide a "sandwich" type clamping of the ends of the sensitive geometry (6), which is disposed between the plate (2) and the support (5). Through the aligned holes, fastening elements (9) are associated, which provide the "sandwich" type clamping.

[0099] In one embodiment, the load measurement system further comprises a microcontroller (7) communicating with the strain gauge (1), which receives the strain values ​​read by the gauge (1). In one embodiment, the microcontroller (7) comprises a circuit board connected to the strain gauge (1) via cabling and stores the value of K. a from that device (11).

[0100] Furthermore, in one embodiment, the microcontroller (7) communicates with at least one temperature reader and / or a vehicle control unit, wherein the microcontroller (7) receives at least one temperature value from the temperature reader and / or the vehicle control unit. In one embodiment, the temperature value is used as a thermal effect compensator to compensate for the thermal expansion suffered. by the components during operation. In another embodiment, the device (11) does not need to interact with the temperature value, being responsible only for reading the deformation of the shaft (10) and reporting its K value. a and deformation to the vehicle.

[0101] In one embodiment, the vehicle control unit is the vehicle VCU / ECU, which understands shaft temperature values ​​(10) collected by vehicle monitoring systems and shares them with the microcontroller (7). In one embodiment, the temperature reader is a temperature sensor positioned on the vehicle shaft (10), which collects the shaft temperature value (10). In one embodiment, the temperature reader is associated with the microcontroller circuit board (7). In another embodiment, the temperature reader is fixed to the sensitive geometry (6). In another embodiment, the temperature reader is external to the device (11).

[0102] In one embodiment, the device (11) of the present invention comprises at least one power source (4) that powers the microcontroller (7). In one embodiment, the power source (4) is a battery. In a preferred embodiment, the power source (4) comes from the vehicle's electrical system and is supplied via cabling.

[0103] In one embodiment, the strain gauge (1) is associated in the central region of the sensitive geometry (6). In a more specific embodiment, at least one strain gauge (1) is associated on the upper face of the central region of the sensitive geometry (6) and at least one strain gauge (1) is associated on the lower face of the central region of the sensitive geometry (6). In a preferred embodiment, the device (11) comprises four strain gauges (1), two being arranged above the central region of the sensitive geometry (6) and two below, forming the configuration of a Wheatstone Bridge.

[0104] Furthermore, the housing (8) comprises a structure that encloses and protects the deformation reader (1), the power source (4) and the microcontroller (7), leaving only the perforated ends of the sensitive geometry (6) exposed. forming a strain sensor device (11). In one embodiment, the lower end of the device (11), facing the axis (10), where the circuit base is located, is coated with a resin that promotes watertightness. Examples

[0105] The examples shown here are intended only to illustrate one of the numerous ways of carrying out the invention, without, however, limiting its scope.

[0106] Example 1 - Calibration Process with K Reading n

[0107] In one embodiment, the calibration process of the present invention comprises the embodiment illustrated in Figure 18, where the device assemblies (11) and shafts (10) are mounted on the vehicle and subsequently the calibration is finalized during the final assembly of the vehicle, with the vehicle on a ground scale, providing precise K values. o .

[0108] Example 2 - Calibration Process with K Estimation n

[0109] In one embodiment, the calibration process of the present invention comprises the embodiment illustrated in Figure 19, where the value of K o It is estimated on the bench, along with the calibration of the K factors. b and K t For this to happen, the value of K o It is less precise than in the embodiment illustrated by Figure 18 of Example 1 above, but it is sufficiently satisfactory and capable of providing load values ​​extremely close to the real values. Furthermore, the value of Ko It can be recalibrated over time, thus eliminating any inaccuracies resulting from estimating K. o .

[0110] Example 3 - Implementation of the Strain Sensor Device

[0111] As illustrated by embodiment in Figure 1, the strain sensor device (11) of the present invention comprises a flat sensitive geometry (6), provided with a pair of holes at each longitudinal end. In the central region of the sensitive geometry (6) are positioned strain readers (1), which are connected to a microcontroller (7) on the circuit board of the device (11).

[0112] The device (11) is fixed to the shaft (10) by means of a pair of supports (5) which are welded to the shaft (10) at their lower end. The sensitive geometry (6) is positioned on the supports (5) so that its through holes align with the threaded holes of each support (5). Above each end of the sensitive geometry (6) is positioned a plate (2) also equipped with through holes. Finally, fastening elements (9) are inserted into the holes of the plate (2), sensitive geometry (6) and support (5), promoting a “sandwich” type tightening of the ends of the sensitive geometry (6). The use of the plate (2) allows for better distribution of the forces resulting from the tightening of the fastening elements (9), promoting a decrease in stress accumulation and a reduction in interference in the device readings.

[0113] The central region of the sensitive geometry (6) is further encased in a housing (8), which houses the circuit with the microcontroller (7) and the strain gauges (1). The housing also has an opening through which the wiring harness passes for power supply to the device (11) and data communication with the vehicle. Thus, from top to bottom, the device (11) follows the sequence housing (8) > strain gauges (1) in the sensitive geometry (6) > circuit with microcontroller (7) > shaft (10). In this way, the circuit with microcontroller (7) is securely housed in the center of the device (11), with its sides surrounded by supports (5). In one embodiment, a resin is also used between the circuit with microcontroller (7) and the shaft (10) to seal the assembly.

[0114] Example 4 - Implementation of the Strain Sensor Device

[0115] As illustrated by embodiment in figures 4 and 6, the strain sensor device (11) of the present invention comprises a sensitive geometry (6) with flat ends and an arched center, provided with an oblong hole at each longitudinal end compatible with an M14 fixing screw. In the central region of the sensitive geometry (6) are positioned strain readers (1), which are connected to a microcontroller (7) on the circuit board of the device (11).

[0116] The device (11) is fixed to the shaft (10) by means of a support (5), illustrated in figures 12 and 13, which is welded to the shaft (10) at its lower ends. The sensitive geometry (6) is positioned on the supports (5) so that its through holes align with the holes in the support (5). Above each end of the sensitive geometry (6) fastening elements (9) are inserted, tightening the ends of the sensitive geometry (6) against the support (5).

[0117] The central region of the sensitive geometry (6) is further encased by a housing (8), which houses the circuit with the microcontroller (7) and the strain gauges (1). Thus, from top to bottom, the device (11) follows the sequence housing (8) > strain gauges (1) in the sensitive geometry (6) > circuit with microcontroller (7) > shaft (10). In this way, the circuit with microcontroller (7) is securely housed in the center of the device (11), with its sides surrounded by supports (5). In one embodiment, a resin is also used between the circuit with microcontroller (7) and the shaft (10) to seal the assembly.

[0118] Example 5 - Implementation of the Strain Sensor Device

[0119] As illustrated by embodiment in Figure 8, the strain sensor device (11) of the present invention comprises a sensitive geometry (6) with flat ends and an arched center, provided with a conical hole at each longitudinal end compatible with an M8 fixing screw. In the central region of the sensitive geometry (6) are positioned strain readers (1), which are connected to a microcontroller (7) on the circuit board of the device (11).

[0120] The device (11) is fixed to the shaft (10) by means of a support (5), illustrated in figures 12 and 13, which is welded to the shaft (10) at its lower ends. The sensitive geometry (6) is positioned on the supports (5) so that its through holes align with the holes in the support (5). Above each end of the sensitive geometry (6) fastening elements (9) are inserted, tightening the ends of the sensitive geometry (6) against the support (5).

[0121] The central region of the sensitive geometry (6) is further encased by a housing (8), which houses the circuit with the microcontroller (7) and the strain gauges (1). Thus, from top to bottom, the device (11) follows the sequence housing (8) > strain gauges (1) in the sensitive geometry (6) > circuit with microcontroller (7) > shaft (10). In this way, the circuit with microcontroller (7) is securely housed in the center of the device (11), with its sides surrounded by supports (5). In one embodiment, a resin is also used between the circuit with microcontroller (7) and the shaft (10) to seal the assembly.

[0122] Example 6 - Implementation of the Strain Sensor Device

[0123] As illustrated by embodiment in Figure 9, the strain sensor device (11) of the present invention comprises a sensitive geometry (6) with flat ends and an arched center, provided with an oblong hole at each longitudinal end compatible with Huck Bolt M14 fastener. In the central region of the sensitive geometry (6) are positioned strain readers (1), which are connected to a microcontroller (7) on the circuit board of the device (11).

[0124] The device (11) is fixed to the shaft (10) by means of a support (5), illustrated in figures 12 and 13, which is welded to the shaft (10) at its lower ends. The sensitive geometry (6) is positioned on the supports (5) so that its through holes align with the holes in the support (5). Above each end of the sensitive geometry (6) fastening elements (9) are inserted, tightening the ends of the sensitive geometry (6) against the support (5).

[0125] The central region of the sensitive geometry (6) is further encased in a housing (8), which houses the circuit with the microcontroller (7) and the strain gauges (1). Thus, from top to bottom, the device (11) follows the sequence housing (8) > strain gauges (1) in the sensitive geometry (6) > circuit with microcontroller (7) > axis (10). In this way, the circuit with The microcontroller (7) is securely housed in the center of the device (11), with its sides surrounded by supports (5). In one embodiment, a resin is also used between the circuit with the microcontroller (7) and the shaft (10) to seal the assembly.

[0126] Those skilled in the art will appreciate the knowledge presented here and will be able to reproduce the invention in the forms presented and in other variants and alternatives covered by the scope of the following claims.

Claims

Claims 1. A vehicle axle (10) load measurement system comprising a device (11) that sensing axle (10) deformation and a cloud platform associated with the vehicle, characterized in that said device (11) generates data based on the deformation suffered by the axle (10), wherein said data is sent to the cloud platform, in such a way that said cloud platform processes the data generated based on the deformation suffered by the axle (10), considering a temperature value relative to the axle (10), and provides a value of the load applied to the axle (10) of the vehicle.

2. System, according to claim 1, characterized by comprising at least one coefficient of physical parameters ( / -), this coefficient being generated during the pre-calibration of the system as a function of physical properties of the vehicle, system components or assembly.

3. System, according to claim 2, characterized in that at least one physical parameter coefficient ( / -) corresponds to a sensor calibration coefficient (K a ), determined based on the device (11) and is intended to calibrate reading variations arising from the production of the device (11).

4. System, according to claim 2, characterized in that at least one physical parameter coefficient ( / -) corresponds to a sensor calibration coefficient (K b ) or a thermal compensation coefficient (K t ), determined as a function of the device (11) and the axis (10), where the coefficient (K b ) is intended to correct reading variations arising from the shaft (10) and device (11) pair, while the coefficient (K t ) is intended to correct reading variations resulting from temperature variation relative to the shaft (10).

5. System, according to claim 2, characterized in that at least one physical parameter coefficient ( / -) corresponds to a tare coefficient (K o ), determined based on the axis (10), the device (11) and the vehicle and is intended to correct reading variations arising from the fixing of the device (11) on the axis (10), the axis (10) on the vehicle and physical parameters of the vehicle itself.

6. System according to claim 5, characterized by the tare coefficient (K o ) to be variable, allowing for system recalibration.

7. A method for measuring the load applied to an axle (10) comprising a device (11) that sensing the deformation of the axle (10) and a cloud platform associated with the vehicle, said method characterized by comprising the steps of: a. reading a temperature relative to the axle (10); b. reading the deformation of the axle (10) by the device (11) and providing data as a function of the deformation; c. receiving the temperature data and data as a function of the deformation by a cloud platform; d. processing, in the cloud, of the data generated as a function of the deformation of the axle (10), considering a temperature value relative to the axle (10); and e. providing a value of the load applied to the axle (10) of the vehicle.

8. Method, according to claim 7, characterized by comprising at least one preliminary calibration step, which generates at least one coefficient of physical parameters ( / -) as a function of physical properties of the vehicle, system components or assembly.

9. Method according to claim 8, characterized in that the preliminary calibration step of a physical parameter coefficient ( / -) corresponds to at least the step of determining a sensor calibration coefficient (K). a ), determined based on the device (11), which is intended to calibrate reading variations arising from the production of the device (11).

10. Method according to claim 8, characterized in that the preliminary calibration step of a physical parameter coefficient ( / -) corresponds to at least the step of determining a sensor calibration coefficient (K). b ) or a thermal compensation coefficient (K t ), or both, determined as a function of the device (11) and the axis (10), where the coefficient (K b ) intended- if to correct reading variations arising from the shaft (10) and device (11) pair, while the coefficient (K t) is intended to correct reading variations resulting from temperature variation relative to the shaft (10).

11. Method, according to claim 8, characterized in that the preliminary calibration step of a physical parameter coefficient ( / -) corresponds to at least the step of determining a tare coefficient (K o ), determined based on the axle (10), the device (11) and the vehicle, intended to correct reading variations arising from the fixing of the device (11) on the axle (10), the axle (10) on the vehicle and physical parameters of the vehicle itself, where the tare coefficient (K o ) is variable, allowing for system recalibration.

12. Method, according to claim 9, characterized by comprising, on the cloud platform, the steps of: a. comparing the load applied to the axle (10) in relation to a predefined load value; b. if the load value on the axle (10) is less than the predefined value, the axle (10) of the vehicle is suspended; c. if the load value on the axle (10) is greater than or equal to the predefined value, the axle (10) of the vehicle is in contact with the ground; and d. calculation of the total load applied to the vehicle given as a function of the number of axles in contact with the ground.

13. Calibration process for a load measurement system applied to a vehicle axle (10) comprising a device (11) that sensing axle deformation (10) and a cloud platform associated with the vehicle, characterized by comprising the step of generating at least one physical parameter coefficient (Kf) as a function of physical properties of the vehicle, system components or assembly, comprising the steps of: a. determining a physical parameter coefficient ( / -) intended to calibrate reading variations arising from the production of the device (11), which corresponds to the calibration coefficient of sensor ( / < a ) and is determined as a function of the device (11); b. determination of a physical parameter coefficient ( / -) intended to correct reading variations arising from the shaft (10) and device (11) pair, which corresponds to the sensor calibration coefficient (K b) and is determined as a function of the device (11) and the axis (10); c. determination of a physical parameter coefficient ( / -) intended to correct reading variations arising from temperature variations relative to the axis (10), which corresponds to the thermal compensation coefficient (K t ) and is determined as a function of the device (11) and the axle (10); and d. determination of a physical parameter coefficient ( / -) intended to correct reading variations arising from the fixing of the device (11) on the axle (10), the axle (10) on the vehicle and physical parameters of the vehicle itself, which corresponds to the tare coefficient (K o ), and is determined as a function of the axle (10), the device (11) and the vehicle, where the tare coefficient (K o ) is variable, allowing for system recalibration.

14. Vehicle shaft (10) deformation sensor device (11) characterized by comprising at least one deformation reader (1) associated with the center of a sensitive geometry (6) of the device (11) to at least one support (5) for fixing the device (11) to the shaft (10), said sensitive geometry (6) being an elongated plate whose distal ends have through holes intended for receiving fixing elements (9) with the support (5), also having a microcontroller circuit (7) associated with the deformation reader (1) and a power source (4).

15. Device (11), according to claim 14, characterized by comprising geometry for preventing variations in readings and mitigating calibration, wherein the microcontroller circuit (7) is housed between the shaft (10) and the sensitive geometry (6) with the strain gauges (1), and also the control circuit (7) surrounded by support (5) and housed in a casing (8) that covers at least part of the device (11).

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