Vehicle measuring device and vehicle

Abstract

A vehicle measuring device and a vehicle, the vehicle measuring device comprises a pressure sensing film and a data processing system electrically connected with the pressure sensing film, the pressure sensing film is provided with a plurality of pressure sensing units arranged in a matrix, each pressure sensing unit is provided with a number, and the data processing system is electrically connected with the data processing system. The data processing system can obtain the distance between any two pressure sensing units according to the numbers; when a vehicle passes through the pressure sensing film, the data processing system obtains the wheel distance between the two wheels according to the two mark images of the two coaxial wheels on the pressure sensing film at a certain moment. According to the vehicle measuring device, the wheel track of the vehicle can be measured through the pressure sensing film, the time of the measuring process is short, and the measuring precision is high.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle detection, in particular to a vehicle measuring device and a vehicle. Background Art

[0002] The current method for measuring vehicle wheelbase is to first locate the wheel center. Using a vertical laser beam projected from a laser level, the horizontal projection of the wheel center is marked on the ground. A straight line is then drawn connecting the two wheel center projections on the same axle. The distance between the front and rear wheel centers is then measured to determine the vehicle's wheelbase. To measure wheelbase, the ground contact lines between the inner and outer tire edges on different sides of the same axle are drawn on the ground and the distance between them is measured. Vehicle weight is measured by driving the vehicle onto a wheel load meter and reading the wheel loads on each wheel.

[0003] Existing methods for measuring vehicle track width and wheelbase require multiple people and are complex. Measurements require at least one driver and two testers, and involve multiple steps, including marking, marking, moving the vehicle, and finally measuring. These procedures are time-consuming, requiring at least two hours to complete all these measurements. Furthermore, the measurement accuracy is low and the operator is not user-friendly. The test requires testers to work outside the vehicle during the entire process, creating a harsh working environment in extreme cold and heat. Utility Model Content

[0004] In view of this, the utility model provides a vehicle measuring device, which can measure the wheelbase of a vehicle through a pressure sensing film, has a short measuring process time and high measuring accuracy.

[0005] A vehicle measurement device includes a pressure sensing film and a data processing system electrically connected to the pressure sensing film. The pressure sensing film is provided with a plurality of pressure sensing units arranged in a matrix, each pressure sensing unit is numbered, and the data processing system can obtain the distance between any two pressure sensing units based on the numbers. When a vehicle passes over the pressure sensing film, the data processing system obtains the wheelbase of two coaxial wheels based on two imprint images on the pressure sensing film at a certain moment.

[0006] In an embodiment of the present invention, the pressure sensing film is provided with a plurality of conductive circuits electrically connected to each pressure sensing unit respectively, and the edge of the pressure sensing film is provided with terminals connected to each of the conductive circuits, and the terminals are electrically connected to the data processing system.

[0007] In an embodiment of the present invention, each of the pressure sensing units includes a polymer film layer and a first electrode and a second electrode arranged on two opposite surfaces of the polymer film layer. The current generated by the pressure on each of the pressure sensing units is output to the data processing system through the conductive circuit.

[0008] In an embodiment of the present utility model, each of the pressure sensing units further includes a first insulating layer, a second insulating layer, a third insulating layer and a third electrode, the first electrode is arranged on the first insulating layer, the polymer film layer covers the first electrode setting, the second electrode is arranged on the polymer film layer, the second insulating layer covers the second electrode setting, the third electrode is arranged on the second insulating layer, and the third insulating layer covers the third electrode setting.

[0009] In an embodiment of the present invention, the data processing system includes a data collector and an intelligent terminal. The data collector is electrically connected to the pressure sensing film, and the intelligent terminal is electrically connected to the data collector.

[0010] In an embodiment of the present utility model, the above-mentioned data acquisition device includes a current and voltage converter, a voltage amplifier, an ADC conversion module and a signal processor electrically connected in sequence, the current and voltage converter is used to convert the current generated by each of the pressure sensing units into a voltage, the voltage amplifier is used to amplify the voltage signal output by the current and voltage converter, the ADC conversion module is used to convert the voltage signal from an analog quantity to a digital quantity, and the signal processor is used to calculate and obtain the pressure value of each of the pressure sensing units.

[0011] In an embodiment of the present invention, the distances between any two adjacent pressure sensing units are equal;

[0012] The length or width of the pressure sensing film is greater than or equal to the width of the vehicle;

[0013] The orthographic projection of the wheel on the pressure sensing film covers at least four of the pressure sensing units;

[0014] Each of the pressure sensing units has a bearing surface for bearing the wheel, and the bearing surfaces of the pressure sensing units have the same shape.

[0015] In an embodiment of the present invention, the data processing system calculates and obtains the speed of the vehicle based on the time it takes for the vehicle to pass through the pressure sensing film and the size of the pressure sensing film, and the data processing system calculates and obtains the wheelbase of the two adjacent axles based on the speed and the time difference between the wheels of the two adjacent axles entering the pressure sensing film.

[0016] In an embodiment of the present invention, when the wheel is on the pressure sensing film, the imprint image formed by the wheel on the pressure sensing film covers a plurality of the pressure sensing units, and the data processing system can obtain the wheel load by summing the pressure value detected by each of the pressure sensing units and the product of the surface area of ​​each of the pressure sensing units.

[0017] The vehicle of the present invention includes the above-mentioned vehicle measuring device.

[0018] The vehicle measuring device of the present invention can measure the wheelbase of a vehicle through a pressure sensing film. During measurement, the driver only needs to drive the vehicle past the pressure sensing film so that the wheelbase can be calculated by the data processing system. The entire process requires only one driver to complete the test measurement, and the driver does not need to get off the vehicle during the test, thereby avoiding the impact of severe cold and hot operations on the driver. The device is very driver-friendly, and the entire test measurement process is short in time and has high measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the vehicle measurement device of the present application.

[0020] Figure 2 This is a schematic structural diagram of the pressure sensing film of the present application when measuring wheel track.

[0021] Figure 3 It is a schematic cross-sectional structural diagram of the pressure sensing unit of the present application.

[0022] Figure 4 It is a structural diagram of the data collector of this application.

[0023] Figure 5 It is a schematic structural diagram of the pressure sensing film of the present application when measuring wheelbase.

[0024] Figure 6 This is a schematic structural diagram of the pressure sensing film of the present application when measuring wheel load.

[0025] Pressure sensing film 10, data processing system 20, pressure sensing unit 12, imprint image 101, terminal 13, polymer film layer 121, first electrode 122, second electrode 123, first insulating layer 124, second insulating layer 125, third insulating layer 126, third electrode 127, data collector 21, intelligent terminal 22, voltage converter 212, voltage amplifier 213, ADC conversion module 214, signal processor 215. DETAILED DESCRIPTION

[0026] The following describes the implementation of the present application through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present application from the contents disclosed in this specification.

[0027] In the following description, reference is made to the accompanying drawings, which illustrate several embodiments of the present application. It should be understood that other embodiments may be used, and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present application. The following detailed description should not be considered limiting, and the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the present application.

[0028] Although the terms "first", "second", etc. are used herein to describe various elements in some instances, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.

[0029] Furthermore, as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms "comprise", "include" indicate the presence of features, steps, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". Exceptions to this definition occur only when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0030] Figure 1 It is a structural diagram of the vehicle measurement device of this application, Figure 2 This is a schematic diagram of the structure of the pressure sensing film of the present application when measuring wheel width, as shown in FIG. Figure 1 and Figure 2 As shown, the vehicle measurement device includes a pressure sensing film 10 and a data processing system 20 electrically connected to the pressure sensing film 10. The pressure sensing film 10 is provided with a plurality of pressure sensing units 12 arranged in a matrix. Each pressure sensing unit 12 is numbered, and the data processing system 20 can determine the distance between any two pressure sensing units 12 based on the number. When a vehicle passes over the pressure sensing film 10, the data processing system 20 determines the wheelbase of two coaxial wheels based on two imprint images 101 on the pressure sensing film 10 at a given moment. In this embodiment, each pressure sensing unit 12 is numbered. For example, if the pressure sensing film 10 has 100 pressure sensing units 12, the pressure sensing units 12 are numbered 1, 2, 3, 4, 5, ..., 100. The number of pressure sensing units 12 can be freely determined based on actual needs. The greater the number of pressure sensing units 12, the higher the measurement accuracy, for example, to 0.1 mm, but this is not a limitation.

[0031] like Figure 2 As shown, when a vehicle travels on the pressure sensing film 10, two wheels on the same axis will have two imprint images 101 on the pressure sensing film 10. The line connecting the geometric centers of the two imprint images 101 is the wheelbase of the two wheels on the axis, and the wheelbase is the vertical distance between the center lines of the two imprint images 101.

[0032] The vehicle measuring device of the present application can measure the wheelbase of a vehicle through a pressure sensing film 10. During measurement, the driver only needs to drive the vehicle past the pressure sensing film 10 so that the data processing system 20 can calculate and obtain the wheelbase. The entire process only requires one driver to complete the test measurement, and the driver does not need to get off the vehicle during the test, thereby avoiding the impact of working in severe cold or heat on the driver. The device is very driver-friendly, and the entire test measurement process is short in time and has high measurement accuracy.

[0033] Optionally, the pressure sensing film 10 is a piezoelectric polyvinylidene fluoride (PVDF) polymer film; when the pressure sensing film 10 of the present application is stretched or pressed, an electrical signal (charge or voltage) is generated between the two electrode surfaces built into the film, and is proportional to the deformation of the stretching or pressing.

[0034] Alternatively, as Figure 2 As shown, the pressure sensing film 10 is provided with a plurality of conductive circuits (not shown) electrically connected to each pressure sensing unit 12. The edge of the pressure sensing film 10 is provided with a terminal 13 connected to each conductive circuit, and the terminal 13 is electrically connected to the data processing system 20.

[0035] Optionally, Figure 3 is a schematic cross-sectional view of the pressure sensing unit of the present application, as shown in FIG. Figure 3 As shown, each pressure sensing unit 12 includes a polymer film layer 121 and a first electrode 122 and a second electrode 123 disposed on opposite surfaces of the polymer film layer 121. The current generated by each pressure sensing unit 12 under pressure is output to the data processing system 20 via a conductive circuit. In this embodiment, the first electrode 122 is a ground electrode, and the second electrode 123 is a signal electrode. The pressure sensing film 10 includes a first electrode 122 and multiple second electrodes 123. The first electrodes 122 of each pressure sensing unit 12 are interconnected, and the second electrodes 123 of each pressure sensing unit 12 are spaced apart from each other.

[0036] Alternatively, as Figure 3As shown, each pressure sensing unit 12 further includes a first insulating layer 124, a second insulating layer 125, a third insulating layer 126, and a third electrode 127. The first electrode 122 is disposed on the first insulating layer 124, with the polymer film layer 121 covering the first electrode 122. The second electrode 123 is disposed on the polymer film layer 121, with the second insulating layer 125 covering the second electrode 123. The third electrode 127 is disposed on the second insulating layer 125, with the third insulating layer 126 covering the third electrode 127. In this embodiment, the third electrode 127 is a ground electrode, and the third electrodes 127 of each pressure sensing unit 12 are interconnected.

[0037] Alternatively, as Figure 1 As shown, the data processing system 20 includes a data collector 21 and a smart terminal 22. The data collector 21 is electrically connected to the pressure sensing film 10, and the smart terminal 22 is electrically connected to the data collector 21. In this embodiment, the smart terminal 22 is, for example, a computer or a mobile phone, but is not limited thereto.

[0038] Optionally, Figure 4 This is a schematic diagram of the structure of the data collector of this application. Figure 4 As shown, the data acquisition device 21 includes a current and voltage converter 212 (I / V converter), a voltage amplifier 213 (Amp li fer), an ADC conversion module 214 and a signal processor 215 (CPU) electrically connected in sequence. The current and voltage converter 212 is used to convert the current generated by each pressure sensing unit 12 into a voltage, the voltage amplifier 213 is used to amplify the voltage signal output by the current and voltage converter 212, the ADC conversion module 214 is used to convert the voltage signal from an analog quantity to a digital quantity, and the signal processor 215 is used to calculate and obtain the pressure value of each pressure sensing unit 12.

[0039] Optionally, the distance d between any two adjacent pressure sensing units 12 is equal. In this embodiment, based on the numbering of the pressure sensing units 12, the distance ΔL between any two pressure sensing units 12 can be calculated as n×d, where n is the number of pressure sensing units 12 between any two pressure sensing units 12 in the horizontal or vertical direction.

[0040] Optionally, the length a or b of the pressure sensing film 10 is greater than or equal to the width of the vehicle.

[0041] Optionally, the orthographic projection of the wheel on the pressure sensing film 10 covers at least four pressure sensing units 12 .

[0042] Optionally, each pressure sensing unit 12 has a bearing surface for bearing the wheel, and the bearing surfaces of each pressure sensing unit 12 have the same shape. In this embodiment, the bearing surface is, for example, a rectangular surface.

[0043] Optionally, the thickness of the pressure sensing film 10 is 1mm-10mm, for example, 1.5mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm.

[0044] Optionally, Figure 5 is a structural schematic diagram of the pressure sensing film of the present application when measuring the wheelbase, as Figure 5 shown, the data processing system 20 calculates the speed of the vehicle according to the time of the vehicle passing through the pressure sensing film 10 and the size of the pressure sensing film 10, and calculates the wheelbase of the adjacent two vehicle axles according to the time difference of the wheels of the adjacent two vehicle axles entering the pressure sensing film 10. In the present embodiment, the passing speed V of the vehicle is obtained by dividing the width b of the pressure sensing film 10 by the time of the vehicle passing through the pressure sensing film 10, i.e. V = b / (t1-t0), wherein t0 is the time point of the front wheel entering the pressure sensing film 10, and t1 is the time point of the front wheel leaving the pressure sensing film 10; the wheelbase L is obtained by multiplying the speed of the vehicle passing through the pressure sensing film 10 by the time difference of the wheels of the adjacent axles entering the pressure sensing film 10, i.e. L = v(t2-t0), wherein t2 is the time point of the rear wheel entering the pressure sensing film 10.

[0045] Optionally, Figure 6 is a structural schematic diagram of the pressure sensing film of the present application when measuring the wheel load, as Figure 6 shown, when the wheels are on the pressure sensing film 10, a plurality of pressure sensing units 12 covered by the footprint image 101 generate a plurality of pressure values, and the data processing system 20 can obtain the wheel load of the wheels by summing up the product of each pressure value and the surface area of each pressure sensing unit 12 wherein n is the number of the pressure sensing units 12 covered by the footprint image 101; s is the surface area of each pressure sensing unit 12; i is the number of each pressure sensing unit 12; p i is the pressure value of the i-th pressure sensing unit 12 in MPa; and the unit of the wheel load m is N.

[0046] The vehicle measuring device of the present application is simple to operate, after the test instrument is installed, only one driver is needed to drive the vehicle to complete the test; and the operation is rapid, and once measurement is performed, the wheelbase, the wheelbase, the wheel load, the axle load, the total weight and other data can be obtained. In addition, the vehicle measuring device has high measurement precision, the wheelbase and the wheelbase measured by the traditional measurement method have millimeter-level precision, and the precision can be 0.1 millimeter.

[0047] In another preferred embodiment, the vehicle measurement device further comprises a vision system (not shown in the figure), which comprises a plurality of camera modules arranged obliquely above the pressure sensing film 10, the lens of each camera module is directed to the surface of the pressure sensing film 10 for recording the two mark images 101 formed by the two wheels on the pressure sensing film 10 and obtaining the wheel track of the two wheels. The data processing system 20 can average the first wheel track obtained by the vision system and the second wheel track obtained by the pressure sensing film 10 to obtain a wheel track with higher precision.

[0048] Optionally, the vehicle measurement device further comprises a plurality of light emitting units (not shown in the figure), each of which is arranged corresponding to each pressure sensing unit 12 and surrounds the periphery of each pressure sensing unit 12. When the wheel passes through the corresponding pressure sensing unit 12, the light emitting units around the pressure sensing unit 12 are triggered to light up. The lighted light emitting units in cooperation with the vision system can more clearly obtain the mark images 101 of the two wheels on the pressure sensing film 10, so as to make the first wheel track obtained more accurate. In this embodiment, each light emitting unit is, for example, a LED light strip, but is not limited thereto.

[0049] The present application also relates to a vehicle comprising the vehicle measurement device described above.

[0050] The above embodiments are only illustrative of the principles and effects of the present application, and are not intended to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present application shall be covered by the claims of the present application.

Claims

1. A vehicle measuring device, characterized in that: The invention comprises a pressure sensing film (10) and a data processing system (20) electrically connected to the pressure sensing film (10), wherein the pressure sensing film (10) is provided with a plurality of pressure sensing units (12) arranged in a matrix, each of the pressure sensing units (12) is provided with a number, and the data processing system (20) can obtain the distance between any two of the pressure sensing units (12) according to the number; when a vehicle passes the pressure sensing film (10), the data processing system (20) obtains the wheelbase of two wheels on the same axis according to two imprint images (101) on the pressure sensing film (10) at a certain moment.

2. The vehicle measuring device according to claim 1, wherein The pressure sensing film (10) is provided with a plurality of conductive circuits electrically connected to the pressure sensing units (12) respectively. The edge of the pressure sensing film (10) is provided with a terminal (13) connected to each of the conductive circuits. The terminal (13) is electrically connected to the data processing system (20).

3. The vehicle measuring device according to claim 2, wherein: Each of the pressure sensing units (12) comprises a polymer film layer (121) and a first electrode (122) and a second electrode (123) arranged on two opposite surfaces of the polymer film layer (121). The current generated by the pressure of each of the pressure sensing units (12) is output to the data processing system (20) via the conductive circuit.

4. The vehicle measuring device according to claim 3, wherein: Each of the pressure sensing units (12) further comprises a first insulating layer (124), a second insulating layer (125), a third insulating layer (126) and a third electrode (127); the first electrode (122) is arranged on the first insulating layer (124); the polymer film layer (121) covers the first electrode (122); the second electrode (123) is arranged on the polymer film layer (121); the second insulating layer (125) covers the second electrode (123); the third electrode (127) is arranged on the second insulating layer (125); and the third insulating layer (126) covers the third electrode (127).

5. The vehicle measuring device according to claim 4, wherein: The data processing system (20) comprises a data collector (21) and an intelligent terminal (22), wherein the data collector (21) is electrically connected to the pressure sensing film (10), and the intelligent terminal (22) is electrically connected to the data collector (21).

6. The vehicle measuring device according to claim 5, wherein: The data acquisition device (21) comprises a current and voltage converter (212), a voltage amplifier (213), an ADC conversion module (214) and a signal processor (215) which are electrically connected in sequence. The current and voltage converter (212) is used to convert the current generated by each pressure sensing unit (12) into a voltage. The voltage amplifier (213) is used to amplify the voltage signal output by the current and voltage converter (212). The ADC conversion module (214) is used to convert the voltage signal from an analog quantity into a digital quantity. The signal processor (215) is used to calculate and obtain the pressure value of each pressure sensing unit (12).

7. The vehicle measuring device according to claim 1, wherein: Include at least one of the following: The distances between any two adjacent pressure sensing units (12) are equal; The length or width of the pressure sensing film (10) is greater than or equal to the width of the vehicle; The orthographic projection of the wheel on the pressure sensing film (10) covers at least four of the pressure sensing units (12); Each of the pressure sensing units (12) has a bearing surface for bearing the wheel, and the bearing surfaces of each of the pressure sensing units (12) have the same shape.

8. The vehicle measuring device according to any one of claims 1 to 7, characterized in that: The data processing system (20) calculates and obtains the speed of the vehicle based on the time when the vehicle passes through the pressure sensing film (10) and the size of the pressure sensing film (10), and the data processing system (20) calculates and obtains the wheelbase of two adjacent axles based on the speed and the time difference between the wheels of the two adjacent axles entering the pressure sensing film (10).

9. The vehicle measuring device according to any one of claims 1 to 7, characterized in that: When the wheel is on the pressure sensing film (10), the imprint image (101) formed by the wheel on the pressure sensing film (10) covers a plurality of the pressure sensing units (12), and the data processing system (20) can obtain the wheel load of the wheel by summing the pressure values ​​detected by each of the pressure sensing units (12) and the product of the surface area of ​​each of the pressure sensing units (12).

10. A vehicle, characterized in that: A vehicle measuring device comprising the vehicle measuring device according to any one of claims 1 to 9.

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