An on-line sampling device and method for measuring the wear of vehicle tires in actual driving conditions

Abstract

This invention relates to the field of vehicle pollutant emission testing, specifically to an online sampling device and method for measuring vehicle tire wear under actual driving conditions. The device includes: a first sampling module, which is installed inside the vehicle body behind the tires and contains a first sampling tube connected to a main sampling pump; the main sampling pump is connected to a main sampling tube, which is equipped with a main flow meter; and a second sampling module, which is mounted on the chassis behind the tires via a mounting bracket. This online sampling device and method can solve the problem that the working conditions of bench tests in the field of tire wear measurement differ significantly from actual driving conditions, leading to unreliable results. Simultaneously, it can improve the collection efficiency of tire wear particulate matter, fill the gap in measuring particulate matter at the bottom of the vehicle chassis, and further improve sampling efficiency.

Description

Technical Field

[0001] This invention relates to the field of vehicle pollutant emission testing, specifically to an online sampling device and method for measuring vehicle tire wear under actual driving conditions. Background Technology

[0002] With the continuous growth of motor vehicle ownership and the rapid development of new energy vehicles in recent years, non-exhaust particulate matter emissions from motor vehicles are receiving increasing attention. Currently, particulate pollutant emissions from brake wear, tire wear, and road surface wear account for 60% and 73% of PM2.5 and PM10 emissions from road transportation, respectively, exceeding exhaust particulate matter emissions. It is foreseeable that in the future, China will include non-exhaust emissions as a target for inspection under the "National VII" emission standard.

[0003] In related technologies, tire wear emission measurement techniques mainly focus on bench testing. Existing tire wear measurement equipment under actual road conditions, such as the "Vehicle Tire Wear Particulate Emission Measurement System and Test Method under Actual Driving Conditions" (CN202410849500.6) applied for by Xiangyang Da'an Automotive Testing Center Co., Ltd., places the sampling port in the gap between the tire and the windshield. While this arrangement is convenient, the presence of the sampling port affects the flow of particles in space, resulting in lower-than-expected sampling efficiency. Furthermore, existing technologies neglect the sampling of tire wear particles accumulating under the vehicle's chassis, further reducing sampling efficiency. The distribution of tire wear particles under the chassis varies at different vehicle speeds; therefore, existing sampling equipment cannot guarantee efficient sampling at different vehicle speeds. Based on this, it is necessary to design an online sampling device and implementation method for vehicle tire wear under actual driving conditions to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide an online sampling device and method for measuring vehicle tire wear under actual driving conditions. This online sampling device and method can solve the problem that the working conditions of bench tests in the field of tire wear measurement differ greatly from actual driving conditions, leading to unreliable results. At the same time, it can improve the collection efficiency of tire wear particles, fill the gap in measuring particles at the bottom of the vehicle disc, and further improve the sampling efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An online sampling device for vehicle tire wear under actual driving conditions includes: a first sampling module, which is installed inside the vehicle body behind the tire; a first sampling tube is provided in the first sampling module and connected to a main sampling pump; the main sampling pump is connected to a main sampling tube and the main sampling tube is equipped with a main flow meter. The second sampling module is mounted on the chassis behind the vehicle tires via a mounting bracket. The second sampling module contains a second sampling tube, which is connected to the main sampling pump. The main sampling pump is connected to the main sampling tube, which is equipped with a main flow meter. The first sampling module and the second sampling module share a main sampling pump. A PN measurement module is connected to the main sampling tube and is used to measure the particle concentration sampled from the main sampling tube. The data processing module is connected to the PN measurement module by signal. The data processing module is used to process the data obtained by the PN measurement module and the main flow meter, and calculate the amount of tire wear particulate matter emissions when the vehicle is in actual driving condition.

[0006] Furthermore, the first sampling module includes a first sampling integration device. The first sampling module is installed inside the vehicle body. The front end of the first sampling module is a rectangular channel with a height of 100mm and a width of 200mm. The installation height is 297mm and the channel length is 600mm. The first sampling module is connected to a Venturi tube. The line connecting the center of the Venturi tube inlet and the center of the tire should maintain an angle of 0° to 10° with the horizontal line.

[0007] Furthermore, the first sampling module also includes a first pre-filter device. One side of the first pre-filter device is connected to the first sampling integration device, and the other side is connected to the first sampling tube. The first filter device is equipped with a stainless steel filter screen with a mesh size of 1340, which is used to screen out large-diameter (particle size greater than 10um) ultrafine particles in the air, and only samples and measures inhalable particulate matter.

[0008] Furthermore, the second sampling module includes a second sampling integration device, a mounting bracket, and a second sampling tube. The second sampling integration device is connected to the second sampling tube through a second pre-filter device. The second sampling module is installed under the vehicle chassis behind the tire via the mounting bracket. The sampling device inlet is located 200mm away from the front wheel, under the chassis behind the rear tire, at a height of 100mm.

[0009] Furthermore, the second sampling module also includes a sampling port adjustment device and guide vanes. The guide vanes are evenly distributed on the sampling port adjustment device with the throat axis as the center, with a total of 8 vanes. The relative position of the guide vanes is fixed, but the vane angle can be adjusted. They are connected to the data acquisition module by signal. Their function is to change the angle according to the control of the data acquisition module when the vehicle speed changes, thereby controlling the gas flow rate and pressure at the sampling port, so as to achieve efficient sampling at different driving speeds.

[0010] Furthermore, the second sampling module also includes a second pre-filter and a second sampling tube. One side of the second pre-filter is connected to the sampling integration device, and the other side is connected to the second pre-filter. The second pre-filter is equipped with a stainless steel filter screen with a mesh size of 1340, which is used to screen out large-diameter particles (greater than 10 μm) of ultrafine particles in the air, and only samples and measures inhalable particulate matter.

[0011] Furthermore, the basic internal structure of the first and second sampling modules is a venturi tube. The sampling module has a high inlet pressure and a low throat pressure. The pressure difference between the inlet and throat of the sampling module is used to efficiently draw in particulate matter. The inlet section of the venturi tube is a cylindrical tube with a diameter of 80 mm and a length of 70 mm. The constriction section has a cone angle of 20°. The throat is a cylindrical tube with a diameter of 20 mm and a length of 20 mm. The diffusion section has a cone angle of 15°.

[0012] The PN measurement module is connected to the sampling manifold and uses the first sampling pump to sample from the sampling manifold to measure the number of particulate matter. The PN measurement module includes a first sampling pump, a PN flow meter, a PN measurement device data acquisition module, and a data processing module. The first sampling pump is connected between the main flow meter and the PN flow meter, and is used to extract the sample from the main sampling tube and deliver it to the PN measurement device. The PN flow meter is connected between the first sampling pump and the PN measurement device. One end of the PN measurement device is connected to the PN flow meter, and the other end is connected to the main sampling tube. The data acquisition module is connected to the data processing module, the GPS and weather station signals, the PN measurement module, and the second sampling module.

[0013] Furthermore, the PN measurement module also includes a particle grower and an optical particle counter; the particle grower also includes a heating saturator and a cooling condenser, and the optical particle counter also includes a particle light collection system and a pulse counting system; the ultrafine aerosol particles are pumped into the measurement device by the first sampling pump. In the PN measurement device, the ultrafine aerosol particles are first mixed with n-butanol vapor in the heating saturator, and then the mixed vapor is transferred to the cooling condenser, where they enter a supersaturated state to achieve particle growth. After growth, the particles enter the particle light collection system.

[0014] Furthermore, the calculation method for the PN measurement module results of a single experiment is as follows: In the formula: PN represents the number of particulate matter emissions from the tire, in particles / km; V1 is the total sampling volume measured by the main flow meter 32 under corrected conditions, in m³. 3 C PNTo measure the average volume concentration of particulate matter in the sampled particles, using measuring device 43 corrected to standard conditions, in units / m³. 3 d represents the distance the vehicle traveled.

[0015] A method for implementing an online sampling device for tire wear of a vehicle in motion includes the following steps: S1. After the device is correctly installed, the sampling vehicle drives normally on the road, and the tire wear particles are collected by the first sampling module and the second sampling module. S2. The sampled items are filtered by the first pre-filter and the second pre-filter to remove tire wear particles with a diameter greater than 10 μm. The second sampling module adjusts the opening of the guide vanes according to information such as vehicle speed, road conditions and temperature provided by GPS and weather station to ensure high collection efficiency of the device under different driving conditions. S3. Particulate matter is introduced into the main sampling tube via the main sampling pump and main flow meter, and then transported to the PN measurement module via the main sampling tube. S4. In the PN measurement module, particulate matter is pumped into the PN measurement device through the first sampling pump and the PN flow meter. In the PN measurement device, the particulate matter is measured after growth. The data is transmitted to the data processing module and the PN value of tire wear particulate matter is calculated. The remaining sample is discharged through the main sampling tube.

[0016] The beneficial effects of this invention are as follows: This invention provides an online sampling device and method for vehicle tire wear under actual driving conditions. By installing the online sampling device on a sampling vehicle, it can sample particulate matter emitted from tire wear under actual driving conditions. Based on data measured by the PN measurement module and the main flow meter, the quantity of tire wear particulate matter emitted can be calculated. Therefore, this device can achieve sampling of tire wear particles under actual driving conditions, solving the problems of low sampling efficiency and lack of sampling of chassis area samples in current related technologies. It also reduces personnel costs during testing. The vehicle tire wear particulate matter emission measurement system under actual driving conditions has a built-in data acquisition module that can automatically process test data and output results, improving test efficiency while reducing the probability of errors. Attached Figure Description

[0017] Figure 1 This application provides an online sampling device and implementation method for vehicle tire wear under actual driving conditions. Figure 2 This is a schematic diagram showing the installation location and basic structure of the first sampling module provided in an embodiment of this application; Figure 3 This is a side view of the sampling port adjustment device provided in an embodiment of this application. Figure 4This is a front view schematic diagram of the sampling port adjustment device provided in the embodiments of this application; The diagram is labeled as follows: 1. First sampling module; 11. First sampling integrated device; 12. First pre-filter device; 13. First sampling tube; 2. Second sampling module; 21. Second sampling integrated device; 211. Sampling port adjustment device; 2111. Guide vane; 2112. Throat; 22. Second pre-filter device; 23. Second sampling tube; 3. Main sampling tube; 31. Main sampling pump; 32. Main flow meter; 4. PN measurement module; 41. First sampling pump; 42. PN flow meter; 43. PN measurement equipment; 5. Data acquisition module; 6. Data processing module; 7. Power supply; 8. Mounting bracket; 9. GPS and weather station. Detailed Implementation

[0018] Specific Embodiment 1: The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. It should be noted that: In the present invention, unless otherwise specified, all implementation methods and preferred implementation methods mentioned herein can be combined with each other to form new technical solutions. In the present invention, unless otherwise specified, all technical features and preferred features mentioned herein can be combined with each other to form new technical solutions. In the present invention, unless otherwise specified, the components involved or their preferred components can be combined with each other to form new technical solutions. In the present invention, unless otherwise specified, the numerical range "a~b" represents an abbreviation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "1.5~2.5" means that all real numbers between "1.5~2.5" have been listed herein, and "1.5~2.5" is just an abbreviation of these numerical combinations. The term "scope" disclosed in this invention is in the form of a lower limit and an upper limit, and may refer to one or more lower limits and one or more upper limits, respectively. In this invention, unless otherwise stated, the various reaction or operation steps may be performed sequentially or in a sequential manner. Preferably, the reaction methods described herein are performed sequentially. Unless otherwise stated, the technical and scientific terms used herein have the same meaning as those familiar with the art. Furthermore, any methods or materials similar to or equivalent to those described herein may also be applied to this invention.

[0019] In the research on tire wear, existing sampling techniques suffer from low sampling efficiency, lack of sampling of particulate matter in the chassis area, and neglect of the different distribution of tire wear particles under the chassis at different vehicle speeds. This invention provides an online sampling device and method for vehicle tire wear under actual driving conditions. The device and method solve the above problems by adjusting the position of the sampling device, increasing sampling of the chassis area, and adding a sampling port adjustment device.

[0020] Reference manual attached Figure 1 As shown, an online sampling device for particulate matter emissions from vehicle tire wear under actual driving conditions includes: a first sampling module 1, installed in the vehicle body behind the tire, connected to a main sampling pump 31, which is connected to a main sampling pipe 3, and the main sampling pipe 3 is equipped with a main flow meter 32; a second sampling module 2, installed under the vehicle chassis behind the tire, mounted on the chassis via a mounting bracket 8, connected to the main sampling pump 31, which is connected to the main sampling pipe 3, and the main sampling pipe 3 is equipped with a main flow meter 32; a PN measurement module 4, connected to the main sampling pipe 3, used for online measurement of the particle concentration sampled from the main sampling pipe 3; and a data processing module 6, connected to the PN measurement module 4, used to calculate the amount of tire wear particulate matter emitted by the vehicle under actual driving conditions based on the data measured by the PN measurement module and the main flow meter 32. The first sampling module 1 and the first sampling module 2 are internally designed in the shape of a Venturi tube. The PN measurement module uses condensation nucleus particle counting to measure the concentration of tire wear particulate matter emissions. Power supply 7 supplies power to all devices during the test.

[0021] Furthermore, the vehicle tire wear particulate matter emission measurement system under actual driving conditions also includes a sampling mounting bracket 8. The sampling mounting bracket 8 fixes the second sampling module 2 under the vehicle and behind the tire. The sampling mounting bracket fixes the second sampling module at the position of the vehicle chassis and the rear side of the tire. The mounting bracket fixes the second sampling module 200mm behind the front tire and 100mm behind the rear tire under the chassis.

[0022] Furthermore, the first sampling module also includes: a first sampling integration device 11, a first pre-filter device 12, and a first sampling tube 13. One side of the first pre-filter device 12 is connected to the first sampling integration device 11, and the other side is connected to the first sampling tube 13. The first sampling integration device has an installation height of 297mm, which is the same width as a tire.

[0023] Furthermore, the second sampling module also includes: a second sampling integration device 21, a sampling port adjustment device 211, a guide vane 2111, a second pre-filter device 22, and a second sampling tube 23. One side of the second pre-filter device 22 is connected to the second sampling integration device 21, and the other side is connected to the second sampling tube 23. The cross-section of the external vertical airway axis of the second sampling integration device is a rectangle with a length of 450 mm and a width of 100 mm. The sampling port adjustment device is the inlet section of the Venturi tube structure inside the second sampling integration device. The inlet section is a cylindrical tube with a diameter of 80 mm and a length of 70 mm. The constriction section has a cone angle of 20°. The throat is a cylindrical tube with a diameter of 20 mm and a length of 20 mm. The diffuser section has a cone angle of 15°.

[0024] Furthermore, the PN measurement module includes: a first sampling pump 41, a PN flow meter 42, and a PN measurement device 43; the first sampling pump 41 is connected between the main flow meter 32 and the PN flow meter 42; the PN flow meter is connected between the first sampling pump 41 and the PN measurement device 43; one end of the PN measurement device 43 is connected to the PN flow meter 42 and the other end is connected to the sampling manifold 3.

[0025] Furthermore, the invented line sampling device and implementation method also include: a GPS and weather station 9, which is used to measure and collect vehicle speed, driving distance, temperature, humidity, and atmospheric pressure data during the experiment; a data acquisition module 5, which is connected to the data processing module 6, the GPS and weather station 9, and the PN measurement module 4, and the second sampling module 2. (See attached specification.) Figure 2 As shown, the sampling device 11 is installed inside the vehicle body behind the wheel, and the sampling port is located on the windshield behind the wheel.

[0026] Reference manual attached Figure 3 Instruction manual attached Figure 4 As shown, the guide vanes 2111 are evenly installed on the sampling port adjustment device 211 with the axis of the throat 2112 as the center. There are a total of 8 vanes. The relative positions of the guide vanes 2111 are fixed, but the angle of the guide vanes 2111 can be adjusted. They are connected to the data acquisition module 5 by signal. Their function is to change the angle according to the control of the data acquisition module when the vehicle speed changes, thereby controlling the gas flow rate and pressure at the sampling port, so as to achieve efficient sampling at different driving speeds. In other words, the opening of the guide vanes 2111 can be adjusted according to the data provided by GPS and weather station to ensure the best sampling efficiency under different driving conditions.

[0027] This application embodiment also provides an implementation method for an online sampling device for vehicle tire wear under actual driving conditions. The method involves testing a vehicle on a flat, straight road at speeds of 60 km / h, 80 km / h, and 100 km / h. The device is installed and activated as described above. Simultaneously, the device is used to sample and analyze tire wear particulate matter emissions online using condensation nucleus particle counting technology, and the amount of emissions from tire wear is calculated.

[0028] Specifically, the implementation method of an online sampling device for vehicle tire wear under actual driving conditions provided in this application includes the following steps: Step 1: Install the online sampling device for vehicle tire wear under actual driving conditions onto the vehicle.

[0029] Step 2: Test the vehicle under actual driving conditions on a flat and straight road. At the same time, use the online sampling device and implementation method for vehicle tire wear under actual driving conditions to sample and analyze the tire wear particulate matter emissions, and calculate the number of tire wear particulate matter emissions.

[0030] Step 3: Drive the vehicle on a relatively straight and long road for testing. Before testing, the PN analyzer 43 should be calibrated, and a suitable main flow meter 32 should be selected. During the test, the vehicle tire wear particulate matter emission measurement system can be powered by the aforementioned onboard power supply 7, or by the vehicle's own power supply, under actual driving conditions. The test conditions are based on actual test road conditions, covering as many common driving scenarios as possible, including low speed, medium speed, high speed, and rapid acceleration and deceleration.

[0031] The main measurement object of this application is the left front wheel or the right front wheel. The measurement result is the particulate matter emission result of a single tire. The final test result can be calculated by multiplying the single result by the number of tires, or by adding the results of multiple tests. After the test starts, the main sampling pump 31, PN measurement module 34, main control computer, data acquisition module 5, GPS and weather station 9 and other devices start synchronously and begin measurement. The method for calculating the PN result of a single experiment is as follows: In the formula: PN represents the number of particulate matter emissions from the tire, in particles / km; V1 is the total sampling volume measured by the main flow meter 32 under corrected conditions, in m³. 3 C PN To measure the average volume concentration of particulate matter in the sampled particles, using measuring device 43 corrected to standard conditions, in units / m³. 3 d represents the distance the vehicle traveled.

[0032] The vehicle tire wear particulate matter emission sampling device and implementation method described in this application under actual driving conditions can efficiently collect tire wear particulate matter and supplement it with the collection of particulate matter under the chassis. The equipment involved in the vehicle tire wear particulate matter emission sampling device under actual driving conditions is all vehicle-mounted and highly integrated, making installation relatively simple and reducing personnel costs during testing. The vehicle tire wear particulate matter emission measurement system under actual driving conditions has a built-in data acquisition module 5 that can automatically process test data and output results, improving testing efficiency while reducing the probability of errors.

[0033] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the invention. They can also be used in products with different structures and in other fields. Those skilled in the art can understand the specific meaning of the terms used in the present invention according to the specific circumstances. Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This descriptive method is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An online sampling device for vehicle tire wear under actual driving conditions, characterized in that, include: The first sampling module (1) is used to be installed inside the vehicle body behind the tires. The first sampling module (1) contains a first sampling tube (13) which is connected to the main sampling pump. The main sampling pump is connected to the main sampling tube, and the main sampling tube is equipped with a main flow meter (32). The second sampling module (2) is mounted on the chassis behind the vehicle tire via a mounting bracket (8). The second sampling module (2) contains a second sampling tube (23), which is connected to the main sampling pump. The main sampling pump is connected to the main sampling tube, and the main sampling tube is equipped with a main flow meter (32). The first sampling module (1) and the second sampling module (2) share a main sampling pump (31). PN measurement module (4), the PN measurement module (4) is connected to the main sampling tube, and the PN measurement module (4) is used to measure the particle concentration sampled from the main sampling tube; The data processing module (6) is connected to the PN measurement module (4) by signal. The data processing module (6) is used to process the data obtained by the PN measurement module (4) and the main flow meter (32) and calculate the amount of tire wear particulate matter emissions of the vehicle under actual driving conditions. The basic internal structure of the first sampling module (1) and the second sampling module (2) is a venturi tube. The sampling module has a high inlet pressure and a low throat pressure. The pressure difference between the inlet and throat of the sampling module is used to efficiently suck up particulate matter. The inlet section of the venturi tube is a cylindrical tube with a diameter of 80 mm and a length of 70 mm. The constriction section has a cone angle of 20°. The throat is a cylindrical tube with a diameter of 20 mm and a length of 20 mm. The diffusion section has a cone angle of 15°.

2. The online sampling device for vehicle tire wear under actual driving conditions according to claim 1, characterized in that, The first sampling module (1) includes a first sampling integration device (11). The first sampling module (1) is installed inside the vehicle body. The front end of the first sampling module (1) is a rectangular channel with a height of 100mm and a width of 200mm. The installation height is 297mm and the channel length is 600mm. The first sampling module (1) is connected to a Venturi tube. The line connecting the center of the Venturi tube inlet and the center of the tire should maintain an angle of 0° to 10° with the horizontal line.

3. The online sampling device for vehicle tire wear under actual driving conditions according to claim 2, characterized in that, The first sampling module (1) further includes a first pre-filter (12). One side of the first pre-filter (12) is connected to the first sampling integrated device (11), and the other side is connected to the first sampling tube (13). The first filter is equipped with a stainless steel filter screen with a mesh size of 1340, which is used to screen out large particles of ultrafine particles in the air, i.e. particles with a particle size greater than 10 μm, and only samples and measures inhalable particulate matter.

4. The online sampling device for vehicle tire wear under actual driving conditions according to claim 3, characterized in that, The second sampling module (2) includes a second sampling integration device (21), a mounting bracket (8), a second front filter device (22), and a second sampling tube (23). The second sampling integration device (21) is connected to the second sampling tube (23) through the second front filter device (22). The second sampling module (2) is installed under the vehicle chassis behind the tires via the mounting bracket (8). The sampling device inlet is located 200mm away from the front wheel, under the chassis behind the rear tires, at a height of 100mm.

5. The online sampling device for vehicle tire wear under actual driving conditions according to claim 4, characterized in that, The second sampling module (2) also includes a sampling port adjustment device (211) and a guide vane (2111). The guide vane (2111) is evenly distributed on the sampling port adjustment device (211) with the throat tube (2112) axis as the center. There are a total of 8 guide vanes (2111). The relative position of the guide vane (2111) is fixed, but the vane angle can be adjusted. It is connected to the data acquisition module (5) by signal. Its function is to change the angle according to the control of the data acquisition module (5) when the vehicle speed changes, thereby controlling the gas flow rate and pressure of the sampling port, so as to achieve efficient sampling at different driving speeds.

6. The online sampling device for vehicle tire wear under actual driving conditions according to claim 5, characterized in that, The second sampling module (2) also includes a second pre-filter (22) and a second sampling tube (23). The second pre-filter (22) is connected to the sampling integration device on one side and to the second pre-filter (22) on the other side. The second pre-filter (22) is equipped with a stainless steel filter screen with a mesh size of 1340, which is used to screen out large particles with a diameter greater than 10 μm in the air and to sample and measure only inhalable particulate matter.

7. The online sampling device for vehicle tire wear under actual driving conditions according to claim 6, characterized in that, The PN measurement module (4) is connected to the sampling manifold. It uses the first sampling pump (41) to sample from the sampling manifold to measure the number of particulate matter. The PN measurement module (4) includes a first sampling pump (41), a PN flow meter (42), a PN measurement device (43), a data acquisition module (5), and a data processing module (6). The first sampling pump (41) is connected between the main flow meter (32) and the PN flow meter (42). The first sampling pump (41) is used to extract the sample from the main sampling tube (3) and send it to the PN measurement device (43). In the above, the PN flow meter (42) is connected between the first sampling pump (41) and the PN measuring device (43); one end of the PN measuring device (43) is connected to the PN flow meter (42), and the other end is connected to the main sampling tube (3); the data acquisition module (5) is connected to the data processing module (6); the data acquisition module (5) is connected to the GPS and meteorological station (9); the data acquisition module (5) is connected to the PN measuring module (4); the data acquisition module (5) is connected to the second sampling module (2).

8. The online sampling device for vehicle tire wear under actual driving conditions according to claim 7, characterized in that, The PN measurement module (4) also includes a particle grower and an optical particle counter; the particle grower also includes a heating saturator and a cooling condenser, and the optical particle counter also includes a particle light collection system and a pulse counting system; the ultrafine aerosol particles are pumped into the measurement device by the first sampling pump (41), and in the PN measurement device (43), the ultrafine aerosol particles are first mixed with n-butanol vapor in the heating saturator, and then the mixed vapor is transferred to the cooling condenser, where they enter a supersaturated state to achieve particle growth, and then the grown particles enter the particle light collection system.

9. The online sampling device for vehicle tire wear under actual driving conditions according to claim 1, characterized in that, The calculation method for the PN measurement module (4) results of a single experiment is as follows: In the formula: PN represents the number of particulate matter emissions from the tire, in units / km; V1 is the total sampling volume measured by the main flow meter (3232) under corrected standard conditions, in m³. 3 C PN To correct the measurement equipment (43) to standard conditions, the volume average concentration of sampled particulate matter, particles / m³, was measured. 3 d represents the distance the vehicle traveled.

10. A method for implementing an online sampling device for tire wear of a vehicle in motion, as described in any one of claims 1-9, characterized in that, The implementation method workflow includes the following steps: S1. After the device is correctly installed, the sampling vehicle drives normally on the road, and the tire wear particles are collected by the first sampling module (1) and the second sampling module (2). S2. The sampled items are filtered by the first pre-filter (12) and the second pre-filter (22) to remove tire wear particles with a particle size greater than 10 μm. The second sampling module (2) adjusts the opening of the guide vane (2111) according to the vehicle speed, road conditions, temperature and other information provided by GPS and the weather station (9) to ensure that the device has high collection efficiency under different driving conditions. S3. The particulate matter is introduced into the main sampling tube (3) via the main sampling pump (31) and the main flow meter (32), and then transported to the PN measurement module (4) via the main sampling tube (3). S4. In the PN measurement module (4), particulate matter is pumped into the PN measurement device (43) by the first sampling pump (41) and the PN flow meter (42). In the PN measurement device (43), the particulate matter is measured after growth. The data is transmitted to the data processing module (6) and then the PN value of tire wear particulate matter is calculated. The remaining sample is discharged through the main sampling tube.

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