Method and device for testing purification performance of purification system in vehicle cabin

Abstract

The embodiment of the invention discloses a method and a device for testing the purification performance of a purification system in a vehicle cabin. The method comprises the steps of generating a first control instruction in response to a purification performance test instruction; for any volatile organic compound, the first concentration of the volatile organic compound in the vehicle cabin and the second concentration of the volatile organic compound in the environment cabin are determined, and the total purification efficiency is calculated according to the change value of the concentration difference between the first concentration and the second concentration within the preset duration; generating a second control instruction to control the test vehicle to turn off the purification system, then determining a third concentration of the volatile organic compound in the vehicle cabin, and calculating a natural settling rate according to a change value of the third concentration in a preset duration; and determining the purification efficiency of the purification system. In the embodiment of the invention, the actual purification performance of the vehicle-mounted purification system can be more accurately determined, the deviation between the test result and the real experience of a user is reduced, and the actual use satisfaction of the user is improved.

Description

Technical Field

[0001] The embodiments in this specification pertain to the field of automotive performance testing, and specifically relate to a method and apparatus for testing the purification performance of an in-vehicle cabin purification system. Background Technology

[0002] In the initial stages of new vehicle delivery, the concentration of volatile organic compounds (VOCs) inside the vehicle is high, which can easily cause dizziness, fatigue, and eye irritation in drivers and passengers, and in severe cases, even affect driving safety. Therefore, evaluating the purification performance of in-vehicle air purification systems has become a crucial part of the vehicle development process. Currently, the testing and evaluation of the VOC removal capabilities of air purification systems mainly rely on component-level testing methods (such as the 1-square-meter chamber method and bag method). These methods differ significantly from the actual vehicle usage environment in terms of spatial scale, airflow organization, and boundary conditions, leading to a systematic bias between test results and real user experience, resulting in poor test effectiveness. Summary of the Invention

[0003] The embodiments of this disclosure provide a method and apparatus for testing the purification performance of an in-vehicle purification system, aiming to solve one or more of the above-mentioned problems and other potential problems.

[0004] According to a first aspect of this disclosure, a method for testing the purification performance of a vehicle cabin purification system is provided. The method includes, in response to a purification performance test command, generating a first control command to control a mass flow controller to inject a standard mixed gas of volatile organic compounds into a sealed cabin of a test vehicle, and then controlling the test vehicle to start the purification system; for any volatile organic compound, determining a first concentration of the volatile organic compound in the cabin and a second concentration in an environmental chamber, and calculating a total purification efficiency based on the change in the concentration difference between the first and second concentrations over a preset time period; generating a second control command to control the test vehicle to shut down the purification system, and then determining a third concentration of the volatile organic compound in the cabin, and calculating a natural settling rate based on the change in the third concentration over a preset time period; and determining the purification efficiency of the purification system based on the difference between the total purification efficiency and the natural settling rate.

[0005] According to a second aspect of this disclosure, a purification performance testing device for a vehicle cabin purification system is provided. The device includes a first control module configured to generate a first control command in response to a purification performance test command, thereby controlling a mass flow controller to inject a standard mixed gas of volatile organic compounds into the sealed cabin of the test vehicle, and then controlling the test vehicle to start the purification system; a concentration determination module configured to determine a first concentration of any volatile organic compound in the cabin and a second concentration in an environmental chamber, and to calculate the total purification efficiency based on the change in the concentration difference between the first and second concentrations over a preset time period; a second control module configured to generate a second control command, thereby controlling the test vehicle to shut down the purification system, and then determining a third concentration of volatile organic compounds in the cabin, and to calculate the natural settling rate based on the change in the third concentration over a preset time period; and a purification efficiency calculation module configured to determine the purification efficiency of the purification system based on the difference between the total purification efficiency and the natural settling rate.

[0006] According to a third aspect of this disclosure, an electronic device is provided, including one or more processors and a memory associated with the one or more processors, the memory being used to store program instructions that, when read and executed by the one or more processors, perform a method provided according to a first scheme.

[0007] According to a fourth aspect of this disclosure, a computer program product is provided, including a computer program that, when executed by a processor, implements the method provided according to the first aspect.

[0008] The solution provided in the embodiments of this specification can determine the purification efficiency by constructing a standardized test environment, injecting a standard mixed gas, and simultaneously sampling and analyzing the total purification efficiency and the natural sedimentation rate. The purification efficiency is determined by the difference between the total purification efficiency and the natural sedimentation rate. This more accurately determines the actual purification performance of the vehicle-mounted purification system, reduces the deviation between test results and the user's real experience, and improves the user's actual satisfaction. Attached Figure Description

[0009] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein: Figure 1 A flowchart illustrating a method for testing the purification performance of an in-vehicle air purification system according to some embodiments of the present disclosure is shown. Figure 2 A schematic diagram illustrating test scenarios for some embodiments of this disclosure is shown; Figure 3 A schematic diagram of the structure of a vehicle cabin purification performance testing device according to some embodiments of the present disclosure is shown; Figure 4 A schematic block diagram of an electronic device according to some embodiments of the present disclosure is shown.

[0010] Among them, 1-test vehicle, 2-sampling conduit, 3-filled column sampling tube, and 4-constant flow gas sampler. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0012] The terms “comprising” and “having”, and any variations thereof, in this specification, claims, and the foregoing drawings are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. Depending on the context, the word “if” as it applies herein may be interpreted as “when”, “in response to determination”, or “in response to detection”.

[0013] Figure 1 A flowchart illustrating a method 100 for testing the purification performance of an in-vehicle air purification system according to some embodiments of this disclosure is shown. Method 100 can be executed by a terminal, which may include, but is not limited to, mobile phones, tablets, desktop computers, servers, etc. Figure 1 As shown in block 102, method 100 can respond to a purification performance test command by generating a first control command to control the mass flow controller to inject a standard mixture of volatile organic compounds into the sealed cabin of the test vehicle, and then control the test vehicle to start the purification system.

[0014] In this embodiment, after the test personnel park the test vehicle in the environmental chamber (a warehouse environment specifically designed for testing), they can send a purification performance test command via mobile phone or other means to initiate the test. Upon responding to the purification performance test command, the terminal first generates a first control command to control the mass flow controller, causing it to continuously inject a standard mixture of volatile organic compounds (VOCs) into the test vehicle's cabin. The specific injection volume and injection time can be adjusted according to requirements, ensuring a significant difference between the VOC content in the cabin and that in the environmental chamber. After the standard mixture is injected, the test vehicle's purification system is activated. The purification system is generally required to be in recirculation mode, with the air conditioning temperature set to the lowest setting and the airflow set to maximum.

[0015] In box 104, method 100 can determine a first concentration of the volatile organic compound in the vehicle compartment and a second concentration in the environmental compartment for any volatile organic compound, so as to calculate the total purification efficiency based on the change in the concentration difference between the first concentration and the second concentration over a preset time period.

[0016] In this embodiment, as Figure 2 As shown, two sampling tubes can be connected to the vehicle cabin to sample benzene compounds using a Tenax sampling tube and aldehydes and ketones using a DNPH tube. Benzene compounds can be analyzed using gas chromatography-mass spectrometry (GC-MS), while aldehydes and ketones can be analyzed using high-performance liquid chromatography (HPLC) to distinguish different volatile organic compounds (VOCs). For any identified VOC, samples will be collected separately in the vehicle cabin and the environmental chamber. The first concentration in the vehicle cabin and the second concentration in the environmental chamber will be calculated based on the mass measured by HPLC / HPLC. The concentration difference between the first and second concentrations represents the reduction in concentration achieved solely by the purification system, excluding the natural dispersion of VOCs by the vehicle. The overall purification efficiency can be calculated based on the change in concentration difference over a preset time period relative to the initial concentration. Depending on the testing requirements, multiple samplings can be performed at different time intervals (e.g., at 0, 15, 30, 45, and 60 minutes) to compare the overall purification efficiency at different times.

[0017] In box 106, method 100 can generate a second control command to control the test vehicle to shut down the purification system, determine a third concentration of volatile organic compounds in the cabin, and calculate the natural settling rate based on the change value of the third concentration over a preset time period.

[0018] In this embodiment, although the overall purification efficiency obtained above excludes the influence of the vehicle on the natural volatilization and dissipation of volatile organic compounds, it still does not exclude the influence of natural sedimentation of compounds. Therefore, after calculating the overall purification efficiency, a second control command can be generated to shut down the purification system. Then, within the same preset time period, a third concentration change value under the condition of no purification system is determined, and the natural sedimentation rate is calculated based on the ratio of this change value to the third concentration before the preset time period. To ensure the accuracy of the natural sedimentation rate as much as possible, a certain amount of standard mixed gas can be reintroduced to reduce the environmental differences between the two samplings.

[0019] In box 108, method 100 can determine the purification efficiency of the purification system based on the difference between the total purification efficiency and the natural settling rate.

[0020] In this embodiment, the purification efficiency under the sole action of the purification system can be calculated based on the difference between the total purification efficiency and the natural sedimentation rate. The purification performance of the purification system can be directly evaluated based on the level of this purification efficiency, or the purification performance can be graded according to the corresponding efficiency range.

[0021] In one possible implementation, generating a first control command includes: Obtain the storage records of the test vehicle in the environmental chamber, and determine the storage duration of the test vehicle in each storage state based on the storage records. Storage states include a sealed state where all accessible devices are closed and an open state where all accessible devices are open; and In response to the fact that the storage duration meets the preset storage conditions and the environmental parameters of the environmental chamber meet the preset parameter conditions, a first control command is generated.

[0022] In this embodiment, new vehicle testing should generally be completed within 23-33 hours after manufacturing. Environmental chamber parameters can be, for example, set to: temperature 25 degrees Celsius, relative humidity 50% RH, wind speed ≤ 0.3 m / s, and benzene and formaldehyde ≤ 0.02 mg / m². The total volatile organic compounds (TVOC) inside the test vehicle should be ≤ 0.2 mg / m². After the test vehicle enters the environmental chamber, it generally needs to be left to stand in the open state for 6 hours, and then left to stand in the closed state for at least 16 hours after that. Therefore, storage conditions will be set according to the above requirements, and the storage time of the test vehicle will be monitored through storage records. Only when the storage time meets all storage conditions and the environmental parameters of the environmental chamber meet the above-mentioned preset parameter conditions will the first control command be generated to initiate actual testing.

[0023] In one possible implementation, the method further includes: Obtain transportation records of the test vehicle during its transport to the environmental warehouse; and In response to the transport record characterization of the test vehicle being exposed to direct sunlight, an additional process is added before the test vehicle's temperature pre-equilibration process based on a closed state, so that the test vehicle is initially balanced in an open state.

[0024] In this embodiment, the transportation records of the test vehicle during its transport to the environmental chamber will also be retrieved. Normally, before entering the environmental chamber, the test vehicle needs to be placed in a pretreatment room at 20-30 degrees Celsius for 24 hours for temperature pre-equilibration, and this process requires the test vehicle to be in a sealed state, i.e., all doors and windows are closed. However, if the transportation records indicate that the test vehicle was exposed to direct sunlight during transportation, this may lead to abnormal levels of organic compounds emitted by the vehicle in a short period. Therefore, an additional process is required: before temperature pre-equilibration, the vehicle needs to be placed in an open state, i.e., with all doors and windows open, for an additional 12 hours for initial equilibration.

[0025] In one possible implementation, determining a first concentration of volatile organic compounds in the vehicle compartment and a second concentration in the environmental chamber includes: A third control command is generated to control the gas sampling pump to collect a first volume of first gas and a second gas in the vehicle compartment and the environmental chamber, respectively. The first volume is corrected for absolute temperature and atmospheric pressure under standard conditions to obtain the second volume; and Based on the second volume, the first concentration of volatile organic compounds in the cabin and the second concentration in the environmental chamber are calculated in the first gas and the second gas, respectively.

[0026] In this embodiment, the first volume collected by the gas sampling pump will have some error due to the influence of atmospheric pressure and temperature, which will affect the accuracy of the calculated concentration. Therefore, the first volume needs to be corrected according to the absolute temperature and atmospheric pressure under standard conditions to obtain a more accurate second volume. Then, the first and second concentrations are calculated based on the ratio of the mass of the compound identified by the instrument in the first gas / second gas to the second volume.

[0027] As an example, the formula for calculating the first volume is: .

[0028] in, The sampling flow rate (mL / min) after calibration of the gas sampling pump. Sampling time (min) Let L be the first volume.

[0029] The formula for calculating the second volume is: .

[0030] in, The corrected second volume (L) This is the absolute temperature under standard conditions (i.e., 273K). It is the sum of the sampling temperature and the absolute temperature under standard conditions (K). The atmospheric pressure (kPa) at which the sample was taken. This is the atmospheric pressure under standard conditions (i.e., 101.3 kPa).

[0031] In one possible implementation, based on a second volume, the first concentration of volatile organic compounds in the vehicle compartment and the second concentration in the environmental chamber are calculated respectively in the first gas and the second gas, including: In response to the volatile organic compound being a benzene series compound, the system acquires the first mass corresponding to the first gas detected by the gas chromatography-mass spectrometry (GC-MS) workstation and the second mass corresponding to the second gas. Based on the ratio of the first mass to the second volume, it calculates the first concentration in the vehicle compartment and the second concentration in the environmental chamber based on the ratio of the second mass to the second volume. In response to the volatile organic compounds being aldehydes and ketones, the third concentration corresponding to the first gas detected by the liquid chromatography workstation and the fourth concentration corresponding to the second gas are obtained. The first concentration in the cabin is calculated based on the product of the target ratio and the third concentration, and the second concentration in the environmental chamber is calculated based on the product of the target ratio and the fourth concentration. The target ratio is the ratio of the solid phase extraction volume to the second volume.

[0032] In this embodiment, the concentration calculation methods for benzene compounds and aldehydes / ketones are different. The formula for calculating the concentration of benzene compounds is as follows: .

[0033] in, This represents the second concentration of benzene compounds within the environmental chamber. For the second mass, This is the second volume.

[0034] .

[0035] in, This represents the highest concentration of benzene compounds inside the vehicle cabin. For the first quality, This is the second volume.

[0036] For aldehydes and ketones, a liquid chromatography workstation can directly measure a concentration result (i.e., the third and fourth concentrations), so the concentration calculation formula is: .

[0037] in, This represents the second concentration of aldehydes and ketones within the environmental chamber. For solid-phase extraction, the volume is fixed. For the second volume, This is the fourth concentration.

[0038] .

[0039] in, This represents the highest concentration of aldehydes and ketones in the vehicle cabin. For solid-phase extraction, the volume is fixed. For the second volume, This is the third concentration.

[0040] In one possible implementation, the method further includes: Determine the chromatogram of the collected air sample, determine the total area of ​​the target volatile organic compounds (VOCs) between n-hexane and n-hexadecane (excluding pentabenzene) in the chromatogram, obtain the chromatographic area, and identify the target VOCs as those ranked first by their area. The fifth concentration is calculated based on the chromatographic area and the second volume, and the total concentration of volatile organic compounds is determined by summing the fifth concentration with the concentration of benzene series compounds.

[0041] In this embodiment, in addition to judging the purification performance of the purification system for a single volatile organic compound (VOC) based on the concentration change of each VOC, the total concentration of all VOCs can also be calculated to evaluate the purification performance from the perspective of the total concentration change. Since the gas chromatography-mass spectrometry (GC-MS) workstation can determine the concentration of benzene compounds, a chromatogram of the collected air sample can be generated. The organic compounds in the chromatogram are ranked according to their area to identify the top 25 VOCs (excluding pentabenzene) among those between hexane and hexadecane. VOCs ranked lower are considered to have extremely low content and are not considered. The total area of ​​these target VOCs is then determined, and combined with the second volume, a fifth concentration is calculated. Finally, the fifth concentration is added to the benzene concentration determined in the aforementioned process (i.e., the first or second concentration of benzene compounds) to obtain the total concentration of VOCs. This total concentration can also be calculated separately for the total concentration in the vehicle cabin and the total concentration in the environmental chamber, with the difference between the two used as the final determined total concentration. The purification performance of the purification system can be comprehensively evaluated from multiple dimensions, such as the purification efficiency of individual volatile organic compounds and the purification efficiency of total concentration.

[0042] Taking the total concentration in the environmental chamber as an example, the calculation formula is: .

[0043] in, The total concentration in the environmental chamber, Let be the chromatographic area, and k and b be the slope and constant term of the linear equation for toluene. For the second volume, This represents the concentration of benzene compounds (if there are multiple benzene compounds, this is the sum of the concentrations of all benzene compounds).

[0044] In one possible implementation, the method further includes: Calculate the half-life corresponding to the concentration difference, and determine the purification performance level of the purification system based on the half-life and purification efficiency.

[0045] In this embodiment, the half-life can also be calculated to comprehensively evaluate the purification performance level of the purification system based on the half-life and purification efficiency. The specific purification performance level corresponding to different half-lives and purification efficiencies can be preset according to the rigor of the test.

[0046] By fitting the first-stage kinetics of in-vehicle air purification, the following equation is obtained: .

[0047] Where k is the purification rate constant, This is the initial concentration. Let be the concentration at time t.

[0048] Half-life is .

[0049] Figure 3 A schematic diagram of the structure of a vehicle cabin purification performance testing device 300 according to some embodiments of the present disclosure is shown. The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and relevant parts can be referred to the description of the method embodiments. Figure 3As shown, the device 300 includes a first control module 301, configured to generate a first control command in response to a purification performance test command, to control the mass flow controller to inject a standard mixed gas of volatile organic compounds into the sealed cabin of the test vehicle, and then control the test vehicle to start the purification system; a concentration determination module 302, configured to determine a first concentration of volatile organic compounds in the cabin and a second concentration in the environmental chamber for any volatile organic compound, and to calculate the total purification efficiency based on the change in the concentration difference between the first and second concentrations over a preset time period; a second control module 303, configured to generate a second control command, to control the test vehicle to shut down the purification system, and then determine a third concentration of volatile organic compounds in the cabin, and to calculate the natural settling rate based on the change in the third concentration over a preset time period; and a purification efficiency calculation module 304, configured to determine the purification efficiency of the purification system based on the difference between the total purification efficiency and the natural settling rate.

[0050] In one possible implementation, the first control module 301 is further configured to acquire the storage record of the test vehicle in the environmental chamber, determine the storage duration of the test vehicle in each storage state based on the storage record, the storage state including a closed state where all openable devices are closed and an open state where all openable devices are open; and generate a first control command in response to each storage duration meeting the preset storage conditions and the environmental parameters of the environmental chamber meeting the preset parameter conditions.

[0051] In one possible implementation, the first control module 301 is further configured to acquire transportation records during the process of transporting the test vehicle to the environmental chamber; and in response to the transportation records indicating that the test vehicle has been exposed to direct sunlight, to add an additional process before the temperature pre-equilibration process of the test vehicle in a closed state, so that the test vehicle performs initial equilibration in an open state.

[0052] In one possible implementation, the concentration determination module 302 is further configured to generate a third control command to control the gas sampling pump to collect a first volume of a first gas and a second gas in the vehicle cabin and the environmental chamber, respectively; to correct the first volume based on the absolute temperature and atmospheric pressure under standard conditions to obtain a second volume; and to calculate the first concentration of volatile organic compounds in the first gas and the second concentration in the environmental chamber based on the second volume.

[0053] In one possible implementation, the concentration determination module 302 is further configured to, in response to the volatile organic compound being a benzene series compound, acquire a first mass corresponding to a first gas detected by a gas chromatography-mass spectrometry (GC-MS) workstation and a second mass corresponding to a second gas, and calculate a first concentration in the vehicle compartment based on the ratio of the first mass to the second volume, and calculate a second concentration in the environmental chamber based on the ratio of the second mass to the second volume; and in response to the volatile organic compound being an aldehyde or ketone compound, acquire a third concentration corresponding to a first gas detected by a liquid chromatography (LC-MS) workstation and a fourth concentration corresponding to a second gas, and calculate a first concentration in the vehicle compartment based on the product of a target ratio and the third concentration, and calculate a second concentration in the environmental chamber based on the product of the target ratio and the fourth concentration, wherein the target ratio is the ratio of the solid-phase extraction volume to the second volume.

[0054] In one possible implementation, the concentration determination module 302 is further configured to determine the chromatogram of the collected air sample, determine the total area of ​​the target volatile organic compounds (VOCs) between n-hexane and n-hexadecane and excluding pentabenzene in the chromatogram, obtain the chromatographic area, and the target VOCs are the VOCs ranked first in the area by a preset order; and calculate a fifth concentration based on the chromatographic area and a second volume, and determine the total concentration of VOCs based on the sum of the fifth concentration and the concentration of benzene series compounds.

[0055] In one possible implementation, the device further includes a half-life calculation module configured to calculate the half-life corresponding to the concentration difference, and determine the purification performance level of the purification system based on the half-life and purification efficiency.

[0056] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this specification is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in or transmitted through a computer-readable storage medium. The computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., Digital Versatile Discs (DVDs)), or semiconductor media (e.g., Solid State Disks (SSDs)).

[0057] Figure 4 A block diagram of an electronic device 400 that can implement various embodiments of the present disclosure is shown. For example... Figure 4 As shown, the electronic device 400 includes a processor 410, a disk drive 420, an input / output interface 430, a network interface 440, and a memory 450. The processor 410, disk drive 420, input / output interface 430, network interface 440, and memory 450 can communicate with each other via a communication bus 460.

[0058] The processor 410 can be implemented using a general-purpose CPU, microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits to execute relevant programs and implement the technical solution provided in this application.

[0059] The memory 450 can be implemented in the form of ROM (Read Only Memory), RAM (Read Access Memory), static memory, dynamic storage devices, etc. The memory 450 can store the operating system 451 used to control the operation of the electronic device 400, and the basic input / output system (BIOS) 452 used to control the low-level operations of the electronic device 400. Additionally, it can store a web browser 453, a data storage management system 454, etc. In summary, when the technical solution provided in this application is implemented through software or firmware, the relevant program code is stored in the memory 450 and is called and executed by the processor 410.

[0060] Input / output interface 430 is used to connect input / output modules to realize information input and output. Input / output modules can be configured as components in the device (not shown in the figure) or externally connected to the device to provide corresponding functions. Input devices may include keyboards, mice, touch screens, microphones, various sensors, etc., and output devices may include displays, speakers, vibrators, indicator lights, etc.

[0061] Network interface 440 is used to connect a communication module (not shown in the figure) to enable communication and interaction between the device and other devices. The communication module can communicate via wired means (such as USB, Ethernet cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.).

[0062] Bus 460 includes a pathway for transmitting information between various components of the device, such as processor 410, disk drive 420, input / output interface 430, network interface 440, and memory 450.

[0063] It should be noted that although the above-described device only shows the processor 410, disk drive 420, input / output interface 430, network interface 440, memory 450, bus 460, etc., in specific implementations, the device may also include other components necessary for normal operation. Furthermore, those skilled in the art will understand that the above-described device may only include the components necessary for implementing the method of this application, and does not necessarily include all the components shown in the figures.

[0064] The program code used to implement the methods of this disclosure may be written in any combination of one or more programming languages. This program code may be provided to a processor or controller of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus, such that when executed by the processor or controller, the program code causes the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may be executed entirely on a machine, partially on a machine, as a standalone software package partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0065] In the context of this disclosure, a machine-readable medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. Machine-readable media can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing. Furthermore, although operations are depicted in a specific order, this should be understood as requiring that such operations be performed in the specific order shown or in sequential order, or requiring that all illustrated operations be performed to achieve the desired result. In certain environments, multitasking and parallel processing may be advantageous. Similarly, while several specific implementation details are included in the foregoing discussion, these should not be construed as limiting the scope of this disclosure. Certain features described in the context of individual embodiments may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented individually or in any suitable sub-combination in multiple implementations.

[0066] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

Claims

1. A method for testing the purification performance of an in-vehicle cabin purification system, characterized in that, The method includes: In response to the purification performance test command, a first control command is generated to control the mass flow controller to inject a standard mixed gas of volatile organic compounds into the sealed cabin of the test vehicle, and then control the test vehicle to start the purification system. For any volatile organic compound, a first concentration of the volatile organic compound in the vehicle cabin and a second concentration in the environmental chamber are determined, and the total purification efficiency is calculated based on the change in the concentration difference between the first concentration and the second concentration over a preset time period. After generating a second control command to control the test vehicle to shut down the purification system, determine the third concentration of volatile organic compounds in the vehicle cabin, and calculate the natural settling rate based on the change in the third concentration over a preset time period; and The purification efficiency of the purification system is determined based on the difference between the total purification efficiency and the natural sedimentation rate.

2. The method for testing the purification performance of an in-vehicle cabin purification system according to claim 1, characterized in that, The generation of the first control command includes: Obtain the storage record of the test vehicle in the environmental chamber, and determine the storage duration of the test vehicle in each storage state based on the storage record. The storage states include a sealed state where all explorable devices are closed and an open state where all explorable devices are open; and In response to the fact that the storage duration of each of the above-mentioned storage conditions is met and the environmental parameters of the environmental chamber are met, a first control command is generated.

3. The method for testing the purification performance of an in-vehicle cabin purification system according to claim 2, characterized in that, The method further includes: Obtain the transportation records of the test vehicle during its transport to the environmental warehouse; and In response to the transport record indicating that the test vehicle was exposed to direct sunlight, an additional process is added before the test vehicle's temperature pre-equilibration process based on a closed state, so that the test vehicle is initially equilibrated in an open state.

4. The method for testing the purification performance of an in-vehicle cabin purification system according to claim 1, characterized in that, Determining the first concentration of the volatile organic compound in the vehicle cabin and the second concentration in the environmental chamber includes: A third control command is generated to control the gas sampling pump to collect a first volume of first gas and a second gas in the vehicle compartment and the environmental chamber, respectively. The first volume is corrected for absolute temperature and atmospheric pressure under standard conditions to obtain the second volume; and Based on the second volume, the first concentration of the volatile organic compound in the vehicle compartment and the second concentration in the environmental chamber are calculated in the first gas and the second gas, respectively.

5. The method for testing the purification performance of an in-vehicle cabin purification system according to claim 4, characterized in that, The calculation of the first concentration of the volatile organic compounds in the vehicle cabin and the second concentration in the environmental chamber, based on the second volume, in the first gas and the second gas respectively, includes: In response to the volatile organic compound being a benzene series compound, the first mass corresponding to the first gas and the second mass corresponding to the second gas detected by the gas chromatography-mass spectrometry (GC-MS) workstation are obtained, and a first concentration in the vehicle cabin is calculated based on the ratio of the first mass to the second volume, and a second concentration in the environmental chamber is calculated based on the ratio of the second mass to the second volume; and In response to the volatile organic compound being an aldehyde or ketone, the third concentration corresponding to the first gas and the fourth concentration corresponding to the second gas detected by the liquid chromatography workstation are obtained. The first concentration in the cabin is calculated based on the product of the target ratio and the third concentration, and the second concentration in the environmental chamber is calculated based on the product of the target ratio and the fourth concentration. The target ratio is the ratio of the solid-phase extraction volume to the second volume.

6. The method for testing the purification performance of an in-vehicle cabin purification system according to claim 1, characterized in that, The method further includes: The chromatogram of the collected air sample is determined, and the total area of ​​the target volatile organic compounds (VOCs) in the chromatogram, excluding pentabenzene, between n-hexane and n-hexadecane, is determined to obtain the chromatographic area. The target VOCs are the VOCs ranked first by their area. The fifth concentration is calculated based on the chromatographic area and the second volume, and the total concentration of volatile organic compounds is determined based on the sum of the fifth concentration and the concentration of benzene series compounds.

7. The method for testing the purification performance of an in-vehicle cabin purification system according to claim 1, characterized in that, The method further includes: Calculate the half-life corresponding to the concentration difference, and determine the purification performance level of the purification system based on the half-life and purification efficiency.

8. A purification performance testing device for an in-vehicle cabin purification system, characterized in that, The device includes: The first control module is configured to respond to the purification performance test command by generating a first control command to control the mass flow controller to inject a standard mixed gas of volatile organic compounds into the sealed cabin of the test vehicle, and then control the test vehicle to start the purification system. The concentration determination module is configured to determine, for any volatile organic compound, a first concentration of the volatile organic compound in the vehicle cabin and a second concentration in the environmental chamber, so as to calculate the total purification efficiency based on the change value of the concentration difference between the first concentration and the second concentration within a preset time period. The second control module is configured to generate a second control command to control the test vehicle to shut down the purification system, determine the third concentration of volatile organic compounds in the vehicle cabin, and calculate the natural settling rate based on the change in the third concentration over a preset time period; and The purification efficiency calculation module is configured to determine the purification efficiency of the purification system based on the difference between the total purification efficiency and the natural sedimentation rate.

9. An electronic device, characterized in that, include: One or more processors, and A memory associated with the one or more processors, the memory being used to store program instructions that, when read and executed by the one or more processors, perform the steps of the purification performance testing method for an in-vehicle purification system according to any one of claims 1-7.

10. A computer program product, characterized in that, The system includes a computer program that, when executed by a processor, implements a method for testing the purification performance of an in-vehicle purification system according to any one of claims 1-7.

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