System for testing volatile organic compounds generated during operation of light vehicle based on rotating hub closed chamber

Abstract

The invention relates to the technical field of light vehicle pollutant detection, in particular to a system for testing volatile organic compounds generated during operation of a light vehicle based on a rotating hub closed chamber, and the system comprises a whole vehicle emission sampling unit which is used for simulating a target working condition environment of a target vehicle in a closed space environment, gas containing volatile organic compounds is generated in the operation process of the target vehicle in the target working condition environment; the collecting unit is used for filtering and condensing the gas containing the volatile organic compounds output by the whole vehicle emission sampling unit, and collecting the filtered and condensed gas to obtain a gas sample; and the analysis unit is used for analyzing the gas sample collected by the collection unit and determining the test result of the volatile organic compounds of the target vehicle according to the analysis result of the gas sample. The technology can be used for analyzing the emission characteristics of volatile organic compounds generated in the running process of the light vehicle.

Description

Technical Field

[0001] The present application relates to the technical field of light vehicle pollutant detection, and in particular to a volatile organic compound testing system generated by the operation of a light vehicle based on a rotary hub sealed chamber. Background Art

[0002] Volatile organic compounds (VOCs) are a class of organic gaseous pollutants that are ubiquitous in the atmosphere and have a complex composition. They are mainly divided into alkanes, aromatic hydrocarbons, olefins, oxygen-containing organics (aldehydes, ketones, ethers, alcohols), etc.

[0003] Motor vehicle VOCs emissions are the main source of VOCs in urban atmosphere. The main sources of VOCs emissions are currently divided into two categories: tail gas emissions and evaporative emissions. With the advancement of tail gas emission control technology, the contribution of evaporative emissions to the total motor vehicle VOCs emissions has become increasingly significant. Evaporative emission pathways mainly include daytime emissions, hot soak emissions, refueling emissions, permeation emissions and operating losses; emission mechanisms mainly include: 1. Due to the increase in temperature, the oil and gas generated in the fuel tank expand and are discharged into the atmosphere through the exhaust port; 2. The oil component molecules pass through the oil system through osmosis and are discharged into the atmosphere; 3. Due to gas-liquid exchange during refueling, the oil and gas are discharged into the atmosphere through the refueling port.

[0004] In addition, relevant studies have shown that VOCs are also produced in the brake emissions of automobile non-exhaust emissions. This may be due to the thermal decomposition of organic adhesives in the components of the brake system caused by the increase in the temperature of the brake system, such as the decomposition of various organic substances such as phenolic resin in the raw materials of brake pads at high temperatures. At present, the proportion of automobile non-exhaust emissions in total automobile emissions is gradually increasing, and the detection and control of non-exhaust emissions is also an important issue that needs to be solved urgently. The volatile organic compounds generated in non-exhaust emissions exist not only in fuel vehicles, but also in electric vehicles. Therefore, it is very important to detect and analyze the volatile organic compounds generated by the operation of light vehicles.

[0005] In the related technology, the test procedure for automobile evaporative pollutant detection is a test procedure for the whole vehicle in a static state, including refueling emission, hot soak emission, and daytime emission test, that is, the HC emission generated by the whole vehicle when refueling, after the engine stops running, and after continuous parking during the day. However, the current detection technology based on volatile organic compounds generated during vehicle operation is still not perfect and needs further development. Summary of the invention

[0006] The present application provides a volatile organic compound testing system and method for the light vehicle generated during operation based on a rotary hub sealed chamber, and a light vehicle, which can accurately detect the characteristics of the volatile organic compound components generated during the operation of the entire vehicle.

[0007] A first aspect of the present application provides a volatile organic compound test system for light vehicles generated during operation based on a rotary hub closed chamber, comprising: a whole vehicle emission sampling unit, used to simulate a target operating environment of a target vehicle in a closed space environment, wherein the target vehicle generates gas containing volatile organic compounds during operation under the target operating environment; a collection unit, used to filter and condense the gas containing volatile organic compounds output by the whole vehicle emission sampling unit, and collect the filtered and condensed gas to obtain a gas sample; an analysis unit, used to analyze the gas sample collected by the collection unit, and determine the test result of the volatile organic compounds of the target vehicle according to the analysis result of the gas sample.

[0008] Optionally, the whole vehicle emission sampling unit includes a closed chamber and a simulation system, wherein the target vehicle is arranged in the closed chamber, and the simulation system adjusts the environmental parameters in the closed chamber according to the target operating condition environment.

[0009] Optionally, the environmental parameters include at least one of temperature, humidity, wind volume and road resistance.

[0010] Optionally, the collection unit includes a sampling tube, a sampling fan, a filtering device, a condensing device and a sampling container, wherein one end of the sampling tube is connected to the sampling port of the whole vehicle emission sampling unit, and the other end of the sampling tube is connected to the filtering device, the filtering device filters the gas containing volatile organic compounds, the condensing device condenses the filtered gas sample, the sampling container collects the condensed gas sample, and the sampling fan is arranged at the rear end of the sampling container to provide power for extracting the gas sample.

[0011] Optionally, the sampling container is a sampling bottle or a sampling air bag that does not undergo photochemical reaction.

[0012] Optionally, the filtering device filters particulate impurities in the gas containing volatile organic compounds, and does not have the ability to filter and adsorb volatile organic compounds.

[0013] Optionally, the analysis unit is a gas chromatograph and mass spectrometer.

[0014] A second aspect of the present application provides a method for testing volatile organic compounds generated during operation of a light vehicle based on a rotary hub closed chamber, wherein the method utilizes the volatile organic compound testing system for light vehicle operation based on a rotary hub closed chamber described in the above embodiment for testing, wherein the method includes the following steps: obtaining a target operating environment required for a target vehicle to perform a volatile organic compound test; simulating the target operating environment of the target vehicle in a closed space environment, wherein the target vehicle generates gas containing volatile organic compounds during operation under the target operating environment; filtering and condensing the gas containing volatile organic compounds, collecting the filtered and condensed gas to obtain a gas sample, analyzing the gas sample collected by the collection unit, and determining the test result of volatile organic compounds of the target vehicle according to the analysis result of the gas sample.

[0015] A third aspect of the present application provides a light vehicle, which is tested for volatile organic compounds using the method for testing volatile organic compounds generated by light vehicle operation based on a rotary hub closed chamber as described in the above embodiment.

[0016] Therefore, this application includes the following beneficial effects:

[0017] The embodiment of the present application can utilize the whole vehicle emission sampling unit to simulate the target operating environment of the target vehicle in a closed space environment, so that the target vehicle generates gas containing volatile organic compounds during operation under the target operating environment. The collection unit filters and condenses the gas containing volatile organic compounds output by the whole vehicle emission sampling unit, collects the filtered and condensed gas to obtain a gas sample, and ensures that the generated volatile organic substances are free of impurities. The analysis unit analyzes the gas sample collected by the collection unit, and determines the test result of the volatile organic compounds of the target vehicle based on the analysis result of the gas sample. The emission characteristics of volatile organic compounds generated during the operation of light vehicles can be analyzed, thereby improving the accuracy of the components and relative contents of the analyzed samples.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0020] Figure 1 A schematic diagram of a volatile organic compound testing system for light vehicle operation based on a rotary hub closed chamber according to an embodiment of the present application;

[0021] Figure 2A schematic diagram of the structure of a volatile organic compound testing system for light vehicle operation based on a rotary hub closed chamber according to an embodiment of the present application;

[0022] Figure 3 The present invention is a flow chart of a method for testing and analyzing volatile organic compounds of light vehicles based on a rotary hub closed chamber according to an embodiment of the present application.

[0023] Explanation of the reference numerals: 1. Closed chamber; 2. Filtering device; 3. Whole vehicle emission sampling unit; 4. Analysis unit; 5. Sampling fan; 10. Testing system for volatile organic compounds generated by light vehicle operation based on a rotary hub closed chamber; 200. Collection unit. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0025] In the related art (1), a method for measuring the volatile organic compound emission factor of the running loss of motor vehicle evaporative emissions is proposed. The emission contribution of all volatile organic compounds measured on the actual road, including exhaust gas, heat soak and running loss process, is deducted to obtain the volatile organic compound emissions in the running loss process. However, this method cannot directly measure the emission characteristics of volatile organic compounds in the running process.

[0026] Therefore, the present application can analyze the emission characteristics of volatile organic compounds generated during the operation of light vehicles, and provide a volatile organic compound testing system and a control method thereof to control the emission development of volatile organic compounds.

[0027] The following describes, with reference to the accompanying drawings, a test system, a test method, and a light vehicle for testing volatile organic compounds generated during operation of a light vehicle based on a rotary hub closed chamber according to an embodiment of the present application.

[0028] Specifically, Figure 1 It is a block diagram of a volatile organic compound testing system generated by light vehicle operation based on a rotary hub closed chamber according to an embodiment of the present application.

[0029] like Figure 1 and Figure 2 As shown, the volatile organic compound testing system 10 for light vehicles generated during operation based on a rotary hub sealed chamber includes: a vehicle emission sampling unit 3 , a collection unit 200 and an analysis unit 4 .

[0030] Among them, the whole vehicle emission sampling unit 3 is used to simulate the target operating environment of the target vehicle in a closed space environment, wherein the target vehicle generates gas containing volatile organic compounds during operation under the target operating environment; the collection unit 200 is used to filter and condense the gas containing volatile organic compounds output by the whole vehicle emission sampling unit, and collect the filtered and condensed gas to obtain a gas sample; the analysis unit 4 is used to analyze the gas sample collected by the collection unit, and determine the test result of volatile organic compounds of the target vehicle according to the analysis result of the gas sample.

[0031] It can be understood that the embodiments of the present application can utilize the whole vehicle emission sampling unit to simulate the target operating environment of the target vehicle in a closed space environment, so that the target vehicle generates gas containing volatile organic compounds during operation under the target operating environment. The collection unit filters and condenses the gas containing volatile organic compounds output by the whole vehicle emission sampling unit, collects the filtered and condensed gas to obtain a gas sample, and ensures that the generated volatile organic substances are free of impurities. The analysis unit analyzes the gas sample collected by the collection unit, and determines the test results of the volatile organic compounds of the target vehicle based on the analysis results of the gas sample. The emission characteristics of volatile organic compounds generated during the operation of light vehicles can be analyzed, thereby improving the accuracy of the components and relative contents of the analysis samples.

[0032] It should be noted that the vehicle emission sampling unit 3 is used to capture samples, the collection unit 200 is used to capture and collect volatile organic compounds while eliminating the influence of other impurities on the volatile organic compound components, and the analysis unit 4 is used to accurately analyze the material composition of the volatile organic compounds.

[0033] In the embodiments of the present application, Figure 2 As shown, the vehicle emission sampling unit 3 includes a closed chamber 1 and a simulation system.

[0034] The target vehicle is placed in a closed room 1, and the simulation system adjusts the environmental parameters in the closed room according to the target working environment.

[0035] The environmental parameters include at least one of temperature, humidity, wind volume and road resistance.

[0036] It can be understood that the embodiments of the present application have the functions of adjusting temperature and humidity, air volume, and setting vehicle road resistance, thereby simulating the actual road operation state of the vehicle when it is running, thereby improving the accuracy and comprehensiveness of the test.

[0037] It should be noted that the closed chamber 1 is a hub closed chamber, which can form a closed space environment, so that the vehicle can travel under cyclic conditions and can simulate the environment of the vehicle in actual road driving.

[0038] In the embodiments of the present application, Figure 2As shown, the collection unit 200 includes a sampling tube, a sampling fan 5, a filtering device 2, a condensing device and a sampling container.

[0039] Among them, one end of the sampling tube is connected to the sampling port of the vehicle emission sampling unit 3, and the other end of the sampling tube is connected to the filtering device 2. The filtering device 2 filters the gas containing volatile organic matter, and the condensing device 2 condenses the filtered gas sample. The sampling container collects the condensed gas sample, and the sampling fan 5 is arranged at the rear end of the sampling container to provide power for extracting the gas sample.

[0040] The sampling container is a sampling bottle or a sampling air bag that will not cause photochemical reaction.

[0041] Among them, the filtering device filters particulate impurities in the gas containing volatile organic compounds, and does not have the ability to filter and adsorb volatile organic compounds.

[0042] It can be understood that the role of the filtering device in the embodiment of the present application is to remove particulate impurities that may interfere with subsequent analysis, while ensuring that VOCs are not adsorbed to avoid sample loss. The condensing device is to make VOCs easier to capture and store and reduce volatile losses. The selection of the sampling container is important to ensure that it will not chemically react with VOCs so that the original state of the sample can be maintained. The sampling fan provides the necessary airflow power to ensure smooth gas flow within the system, thereby achieving effective sampling.

[0043] It should be noted that the collection device 200 is specifically used to capture and collect volatile organic compounds. In order to eliminate the influence of other impurities that may be generated during the operation of the closed chamber on the volatile organic compound components, the system is equipped with a filtering device at the collection port to effectively filter impurities such as particulate matter. In addition, in order to ensure that the easily volatile part of the volatile organic compounds can be collected, the system is also equipped with a condensing device at the collection port to achieve effective condensation and collection of the target substance.

[0044] Specifically, the collection unit 200 is used to filter and condense the collected samples to collect volatile organic compounds. The collection process should fully consider the characteristics of volatile organic compounds: easy to volatilize, decompose, etc.; in order to avoid the influence of other impurities in the closed chamber, a filtering device is installed at the sample collection position to filter non-exhaust particulate matter, such as tire wear particles, brake wear particles and other impurities, and then condense the substances to condense volatile substances, and then collect them. In order to avoid photochemical reactions in volatile organic substances, a light-proof collection device is selected. In addition, the filtered substances can also be directly connected to the chemical collection air bag to avoid the volatilization of organic matter.

[0045] During the test, a stable sampling tube is selected, and samples are drawn from the side sampling port. The samples are then filtered to remove other particulate impurities. After that, the volatile substances are condensed through a condensation device and then collected in a sampling bottle.

[0046] In the embodiment of the present application, the analysis unit 4 is a gas chromatograph and a mass spectrometer; the analysis unit 4 has an online analysis function and an offline analysis function.

[0047] It can be understood that the analysis unit in the embodiment of the present application can use gas chromatography-mass spectrometry to accurately analyze the material composition and relative content of the VOCs samples obtained from the vehicle emission sampling unit and the collection unit, thereby ensuring the accuracy and reliability of the test results.

[0048] It should be noted that the gas chromatograph and mass spectrometer may be a GC / MS analysis instrument, and the analysis unit 4 may be an online analysis device or an offline analysis device, depending on the test requirements and conditions.

[0049] For the online analysis device, the device divides the collected volatile organic compounds into two independent pipelines for processing. One pipeline is specifically used to test and analyze the hydrocarbon (HC) components; the other pipeline is used to analyze other oxygen-containing substances, including but not limited to aldehydes, ketones, etc. after filtering.

[0050] The offline test device collects samples from two sampling ports, stores them under appropriate conditions, and then performs offline analysis. This method is suitable for situations where long-term monitoring or analysis under specific conditions is required, and can provide more flexible and detailed data support.

[0051] According to the volatile organic compound testing system for light vehicles generated during operation based on a hub closed chamber proposed in the embodiment of the present application, a whole vehicle emission sampling unit is used to simulate a target operating environment of a target vehicle in a closed space environment, so that the target vehicle generates gas containing volatile organic compounds during operation under the target operating environment. The collecting unit filters and condenses the gas containing volatile organic compounds output by the whole vehicle emission sampling unit, and collects the filtered and condensed gas to obtain a gas sample, thereby ensuring that the generated volatile organic compounds are free of impurities. The analyzing unit analyzes the gas sample collected by the collecting unit, and determines the test result of the volatile organic compounds of the target vehicle based on the analysis result of the gas sample. The emission characteristics of volatile organic compounds generated during the operation of the light vehicle can be analyzed, thereby improving the accuracy of the components and relative contents of the analyzed samples.

[0052] Figure 3 A flow chart of a method for testing volatile organic compounds generated during operation of a light vehicle based on a rotary hub closed chamber provided in an embodiment of the present application.

[0053] like Figure 3 As shown, the volatile organic compound test method for a light vehicle generated during operation based on a rotary hub sealed chamber is tested using the volatile organic compound test system for a light vehicle generated during operation based on a rotary hub sealed chamber of the above embodiment, wherein the method comprises the following steps:

[0054] In step S101, a target operating environment required for a volatile organic compound test of a target vehicle is obtained.

[0055] It is understandable that the embodiments of the present application can obtain the target operating environment required for the target vehicle to perform a volatile organic compound test, so as to facilitate the subsequent simulation of the target operating environment of the target vehicle in a confined space environment.

[0056] In step S102, a target operating environment of a target vehicle is simulated in a closed space environment, wherein the target vehicle generates gas containing volatile organic compounds during operation in the target operating environment.

[0057] It can be understood that the embodiments of the present application can simulate the target operating environment of the target vehicle in a confined space environment, wherein the target vehicle generates gas containing volatile organic compounds during operation under the target operating environment, thereby simulating its actual road operating state when the vehicle is running, thereby improving the accuracy and comprehensiveness of the test.

[0058] In step S103, the gas containing volatile organic compounds is filtered and condensed, the filtered and condensed gas is collected to obtain a gas sample, the gas sample collected by the collection unit is analyzed, and the test result of the volatile organic compounds of the target vehicle is determined according to the analysis result of the gas sample.

[0059] It can be understood that the embodiments of the present application can filter and condense the gas containing volatile organic compounds, collect the filtered and condensed gas to obtain a gas sample, analyze the gas sample collected by the collection unit, and determine the test results of the volatile organic compounds of the target vehicle based on the analysis results of the gas sample, thereby analyzing the emission characteristics of volatile organic compounds generated during the operation of the light vehicle, thereby improving the accuracy of the components and relative contents of the analyzed samples.

[0060] According to the volatile organic compound testing method for light vehicle operation based on a hub closed chamber proposed in an embodiment of the present application, a target operating condition environment required for the volatile organic compound testing of a target vehicle is obtained, and the target operating condition environment of the target vehicle is simulated in a closed space environment, wherein the target vehicle generates gas containing volatile organic compounds during operation under the target operating condition environment, the gas containing volatile organic compounds is filtered and condensed, and the filtered and condensed gas is collected to obtain a gas sample, the gas sample collected by the collection unit is analyzed, and the test result of the volatile organic compounds of the target vehicle is determined according to the analysis result of the gas sample, thereby analyzing the emission characteristics of volatile organic compounds generated during the operation of the light vehicle, thereby improving the accuracy of the components and relative contents of the analyzed samples.

[0061] The working process of the entire test method will be described below in conjunction with a specific embodiment, as follows:

[0062] First, prepare the vehicle: clean it thoroughly and make sure all hydrocarbon-containing materials, such as windshield washer fluid, are drained from the vehicle.

[0063] Then, a pipe made of a specific material is used to connect the outlet end to the pipe in the closed chamber to ensure the tightness of the connection. When the vehicle is running, the exhaust gas is discharged to the outside from the connected exhaust pipe. Volatile organic matter is generated by the evaporation of fuel and the decomposition of the binder in the brake pad when the vehicle brakes. The mixed substances are mixed evenly in the closed chamber using the front fan.

[0064] Then, the materials in the closed room are collected and filtered to remove dust and other particulate impurities. Next, the volatile organic matter is condensed and collected through the condensation system and stored in a sampling bottle (air bag) that cannot undergo photochemical reactions.

[0065] Finally, the samples were subjected to offline analysis and testing, and GC / MS was used to analyze the components and relative contents of the samples.

[0066] Specifically, based on the WLTC operating conditions, the particulate matter in the closed chamber is collected after each speed stage, that is, four samples are taken in each cycle.

[0067] It should be noted that the filter device cannot adsorb or filter volatile organic compounds, so it is necessary to select a suitable filter device and consider the characteristics of the impurities.

[0068] In summary, the sampling and collection unit can accurately collect the volatile organic compounds generated during the operation of the vehicle and ensure that there is no impurity doping, and the analysis unit can accurately analyze the components and relative content of the sample.

[0069] An embodiment of the present application also provides a light vehicle, which performs a volatile organic compound test using the volatile organic compound test method generated by the operation of a light vehicle based on a rotary hub closed chamber according to the above embodiment.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0071] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0072] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0073] It should be understood that the various parts of the present application can be implemented in hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, the steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array, a field programmable gate array, etc.

[0074] A person of ordinary skill in the art may understand that all or part of the steps carried by the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the above-mentioned program may be stored in a computer-readable storage medium, which, when executed, includes one of the steps of the method embodiment or a combination thereof.

[0075] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A volatile organic compound testing system for light vehicles based on a rotary hub sealed chamber, characterized in that: include: A vehicle emission sampling unit, used to simulate a target operating environment of a target vehicle in a confined space environment, wherein the target vehicle generates gas containing volatile organic compounds during operation under the target operating environment; A collecting unit, used for filtering and condensing the gas containing volatile organic compounds output by the vehicle emission sampling unit, and collecting the filtered and condensed gas to obtain a gas sample; The analyzing unit is used to analyze the gas sample collected by the collecting unit, and determine the test result of the volatile organic matter of the target vehicle according to the analysis result of the gas sample.

2. The volatile organic compound testing system for light vehicles generated during operation based on a rotary hub sealed chamber according to claim 1 is characterized in that: The whole vehicle emission sampling unit includes a closed chamber and a simulation system, wherein the target vehicle is arranged in the closed chamber, and the simulation system adjusts the environmental parameters in the closed chamber according to the target operating condition environment.

3. The volatile organic compound testing system for light vehicles generated during operation based on a rotary hub sealed chamber according to claim 2 is characterized in that: The environmental parameter includes at least one of temperature, humidity, wind volume and road resistance.

4. The volatile organic compound testing system for light vehicles generated during operation based on a rotary hub sealed chamber according to claim 1 is characterized in that: The collection unit includes a sampling tube, a sampling fan, a filtering device, a condensing device and a sampling container, wherein one end of the sampling tube is connected to the sampling port of the whole vehicle emission sampling unit, and the other end of the sampling tube is connected to the filtering device. The filtering device filters the gas containing volatile organic compounds, and the condensing device condenses the filtered gas sample. The sampling container collects the condensed gas sample, and the sampling fan is arranged at the rear end of the sampling container to provide power for extracting the gas sample.

5. The volatile organic compound testing system for light vehicle operation based on a rotary hub closed chamber according to claim 4 is characterized in that: The sampling container is a sampling bottle or a sampling air bag that does not cause photochemical reaction.

6. The volatile organic compound testing system for light vehicles generated during operation based on a rotary hub sealed chamber according to claim 4 is characterized in that: The filter device filters particulate impurities in the gas containing volatile organic compounds, and does not have the ability to filter and adsorb volatile organic compounds.

7. The volatile organic compound testing system for light vehicles generated during operation based on a rotary hub sealed chamber according to claim 1 is characterized in that: The analysis unit is a gas chromatograph and mass spectrometer.

8. The volatile organic compound testing system for light vehicles generated during operation based on a rotary hub sealed chamber according to claim 1 is characterized in that: The analysis unit has an online analysis function and an offline analysis function.

9. A method for testing volatile organic compounds generated by light vehicle operation based on a rotary hub closed chamber, characterized in that: The method is tested using the volatile organic compound test system generated by light vehicle operation based on a rotary hub closed chamber according to any one of claims 1 to 8, wherein the method comprises the following steps: Obtain the target operating environment required for the volatile organic compound test of the target vehicle; Simulating a target operating environment of the target vehicle in a confined space environment, wherein the target vehicle generates gas containing volatile organic compounds during operation in the target operating environment; The gas containing volatile organic compounds is filtered and condensed, the filtered and condensed gas is collected to obtain a gas sample, the gas sample collected by the collection unit is analyzed, and the test result of the volatile organic compounds of the target vehicle is determined according to the analysis result of the gas sample.

10. A light vehicle, characterized in that: The vehicle is tested for volatile organic compounds using the method for testing volatile organic compounds generated by light vehicle operation based on a rotary hub closed chamber as described in claim 9.

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