Tracing method and device for VOC (Volatile Organic Compounds) in vehicle

Abstract

The invention discloses an in-vehicle VOC tracing method and device, and relates to the technical field of vehicles. According to the method, at least one part with the top contribution rate is determined as the target part according to the contribution rate of the VOC of each part in the total VOC in the vehicle, namely, the high-risk part for VOC emission, after the high-risk part is determined, the high-risk part is subjected to material disassembly, and according to the contribution rate of the VOC of each material in the total VOC of the part, the total VOC of the part is obtained. And at least one material with the top contribution rate is determined as a target material, namely a high-risk material for VOC emission, high-risk parts and high-risk materials are obtained rapidly, and then targeted improvement is carried out.

Description

Technical Field

[0001] This application relates to the technical field of vehicles, and particularly to a method and device for tracing the source of VOCs in a vehicle interior. Background Art

[0002] With the improvement of living standards, cars have become a necessity for thousands of households. A good vehicle interior environment can not only avoid physical damage, but also enhance the comfort of driving and riding. As consumers pay more attention to the air quality in the vehicle interior, vehicles need to undergo VOC tests before leaving the factory. The harmful substances in the vehicle interior mainly come from VOCs, that is, volatile organic compounds such as formaldehyde, acetaldehyde, acrolein, benzene, toluene, ethylbenzene, xylene, styrene, etc.

[0003] However, the entire process of traditional VOC source tracing methods takes a long time. Among them, the whole vehicle VOC test usually takes 4 days, the component VOC test usually takes 14 days, and the material VOC test usually takes 6 days, and it can only be carried out in a fixed laboratory location, which is time-consuming and very inconvenient. Summary of the Invention

[0004] This application provides a method and device for tracing the source of VOCs in a vehicle interior, which can quickly achieve VOC source tracing and reduce the time consumption.

[0005] In the first aspect, this application provides a method for tracing the source of VOCs in a vehicle interior, including the following steps:

[0006] Obtain the types, contents of VOCs in the vehicle interior of the whole vehicle, and the weight coefficients of each VOC in the total VOC in the vehicle interior;

[0007] Obtain the types and contents of VOCs in each component in the vehicle interior according to the types of components in the vehicle interior, the usage amount of components, and the exposure coefficient of components;

[0008] Obtain the contribution rate of the VOCs in each component to the total VOC in the vehicle interior according to the types and contents of VOCs in each component in the vehicle interior, the weight coefficients of each VOC in the total VOC in the vehicle interior, and the exposure coefficient of components;

[0009] Determine at least one component with a relatively high contribution rate as the target component according to the contribution rate of the VOCs in each component to the total VOC in the vehicle interior;

[0010] Obtain the weight coefficients of each VOC in the target component in the total VOC of the target component, and the types and contents of VOCs in each material of the target component;

[0011] Obtain the contribution rate of the VOCs in each material of the target component to the total VOC of the target component according to the weight coefficients of each VOC in the target component and the types and contents of VOCs in each material of the target component;

[0012] Based on the contribution rate of the VOC of each material in the target part to the total VOC of the target component, at least one material with a relatively high contribution rate ranking is determined as the target material.

[0013] In this application, based on the contribution rate of the VOC of each component to the total VOC in the vehicle interior, at least one component with a relatively high contribution rate ranking is determined as the target component, that is, a high-risk part for VOC emissions. After determining the high-risk parts, the materials of the high-risk parts are disassembled. Based on the contribution rate of the VOC of each material to the total VOC of the component, at least one material with a relatively high contribution rate ranking is determined as the target material, that is, a high-risk material for VOC emissions, quickly obtaining the high-risk parts and high-risk materials, and then making targeted improvements. This solution can accurately locate the pollution source, only conduct in-depth disassembly tests on high-risk targets, reduce the ineffective detection of low-risk materials, reduce costs and waste of resources, shorten the time for VOC traceability, and improve the efficiency of improving the air quality in the vehicle interior.

[0014] In some embodiments, in the process of obtaining the types, contents of VOCs in the vehicle interior of the whole vehicle and the weight coefficient of each VOC in the total VOC in the vehicle interior, the method for obtaining the types and contents of VOCs in the vehicle interior of the whole vehicle includes the time-of-flight mass spectrometry method. The time-of-flight mass spectrometry method determines the mass-to-charge ratio (m / z) by measuring the flight time of ions in a vacuum flight tube. Using the time-of-flight mass spectrometry method can accurately identify complex mixtures, has the capabilities of rapid response and real-time monitoring, and can efficiently and quickly detect the types and contents of VOCs in the vehicle interior.

[0015] In some embodiments, in the process of obtaining the types, contents of VOCs in the vehicle interior of the whole vehicle and the weight coefficient of each VOC in the total VOC in the vehicle interior, when obtaining the weight coefficient of each VOC in the total VOC in the vehicle interior, it satisfies:

[0016]

[0017] where K i is the weight coefficient of the i-th substance in the vehicle interior to the total VOC in the vehicle interior;

[0018] C0i is the concentration of the i-th substance in the vehicle interior;

[0019] n is the number of types of VOCs in the driver's cab.

[0020] Calculating the weight coefficient of each VOC in the total VOC in the vehicle interior can know which types of VOCs have higher concentrations among all the types of VOCs in the vehicle interior, and can determine the specific types of VOCs with high emission concentrations.

[0021] In some embodiments, in the process of obtaining the types and contents of VOCs of each component in the vehicle interior according to the types of vehicle interior components, the consumption of components, and the exposure coefficient of components, the method for obtaining the types and contents of VOCs of each component in the vehicle interior includes measuring the types and contents of VOCs of each component in the vehicle interior by using the flying time mass spectrometry method in a variable volume test chamber. The components are placed in the variable volume test chamber for the time-of-flight mass spectrometry test. By changing the volume of the gas introduced into the in-cabin airbag, the size of the space in the test chamber can be changed, and the corresponding relationship between the test chamber and the cab space can be established, so that the sampling is in an equal proportion relationship with the actual situation, improving the accuracy of measurement. Components with exactly the same composition materials, such as door seals, can be tested together.

[0022] In some embodiments, the contribution rate of the VOC of each component to the total VOC in the vehicle interior satisfies:

[0023]

[0024] where W is the contribution rate of the VOC of the component to the total VOC in the vehicle interior;

[0025] β is the exposure coefficient of the component, that is, the proportional coefficient of the exposed area of the component to the total area;

[0026] C i is the concentration of the i-th substance detected in the component;

[0027] K i is the VOC weight coefficient of the i-th substance in the vehicle interior;

[0028] n is the number of types of VOCs in the vehicle interior.

[0029] Calculating the contribution rate of the VOC of each component to the total VOC in the vehicle interior can obtain the VOC emission level of each component. Usually, the component with a large contribution rate is the high-risk component with high VOC emissions. When calculating the contribution rate of the VOC of each component to the total VOC in the vehicle interior, the exposure coefficient of the component, that is, the proportional coefficient of the exposed area of the component to the total area, is considered, which can more accurately indicate the VOC emission level of the component. The area of the component can be measured by laminating. Attach a plastic film to the surface of the sample, and use a marker pen to outline the contour of the exposed part. Flatten the plastic film, measure the size with a steel ruler or tape measure, and calculate the area of the soft component by using mathematical formulas or drawing software.

[0030] In some embodiments, when obtaining the weight coefficient of each VOC in the target component in the total VOC of the target component, the types and contents of VOCs of each material of the target component, the weight coefficient of each VOC in the total VOC of the target component satisfies:

[0031]

[0032] Among them, K i ’ is the weight coefficient of the i-th substance in the target component in the total VOC of the target component;

[0033] C 0i ’ is the concentration of the i-th substance in the target component;

[0034] n is the number of VOC types in the target component.

[0035] By calculating the weight coefficient of each VOC in the target component in the total VOC of the target component, it is possible to determine which types of VOCs in the target component have higher concentrations, and specific VOC types with high emission concentrations can be determined.

[0036] In some embodiments, when obtaining the VOC types and contents of each material of the target part, the following is satisfied:

[0037] Material sampling amount = total material usage * sampling bag volume / vehicle interior space volume.

[0038] Considering that the ratio between the sampling bag volume and the cab or the vehicle interior space volume is not necessarily 1:1, therefore, adjusting the material sampling amount according to the actual ratio can more accurately simulate the actual situation inside the vehicle and improve the accuracy of data measurement. It should be noted that for a specific test vehicle model, the total material usage is provided by the vehicle manufacturer, and once the vehicle model is determined, the total material usage is also determined.

[0039] In some embodiments, when obtaining the contribution rate of the VOC of each material in the target part to the total VOC of the target component, the following is satisfied:

[0040]

[0041] Among them, W’ is the contribution rate of the VOC of the material to the total VOC of the target component;

[0042] C i ’ is the concentration of the i-th substance detected in the material;

[0043] K i ’ is the VOC weight coefficient of the i-th substance in the target component;

[0044] n’ is the number of VOC types in the target component.

[0045] By calculating the contribution rate of the VOC of each material in the target part to the total VOC of the component, it is possible to know which materials are high-VOC-emitting materials among the components with high VOC emissions, and then determine the materials with high VOC contributions, and improvements can be made for specific materials.

[0046] In some embodiments, the components include at least one of a seat, a door panel, a roof lining, an instrument panel, and a carpet. Generally, the above components have a risk of VOC emissions. By testing the above components, high-risk components of VOC emissions can be screened out more quickly.

[0047] In a second aspect, the present application provides an in-vehicle VOC traceability device, including:

[0048] A first acquisition unit for acquiring the types, contents of VOCs in the vehicle interior of the whole vehicle, and the weight coefficients of each VOC in the total VOC in the vehicle interior;

[0049] A second acquisition unit for acquiring the types and contents of VOCs in each component in the vehicle interior according to the types of components in the vehicle interior, the usage amount of the components, and the exposure coefficient of the components;

[0050] A third acquisition unit for acquiring the contribution rate of the VOCs of each component in the total VOC in the vehicle interior according to the types and contents of VOCs in each component in the vehicle interior, the weight coefficients of each VOC in the total VOC of the component, and the exposure coefficient of the component;

[0051] A first execution unit for determining at least one component with a higher contribution rate as a target component according to the contribution rate of the VOCs of each component in the total VOC in the vehicle interior;

[0052] A fourth acquisition unit for acquiring the weight coefficients of each VOC in the total VOC of the target component, the types and contents of VOCs of each material of the target component;

[0053] A fifth acquisition unit for acquiring the contribution rate of the VOCs of each material in the target component in the total VOC of the target component according to the weight coefficients of each VOC in the target component, the types and contents of VOCs of each material of the target component; and

[0054] A second execution unit for determining at least one material with a higher contribution rate as a target material according to the contribution rate of the VOCs of each material in the target component in the total VOC of the target component. Description of the Drawings

[0055] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0056] Figure 1 It is a flowchart of an in-vehicle VOC traceability method according to an embodiment of the present application.

[0057] Figure 2 Schematic diagram of an in-vehicle VOC tracing device according to an embodiment of the present application. DETAILED DESCRIPTION

[0058] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of this application without making any creative efforts shall fall within the scope of protection of this application.

[0059] With rising living standards, cars have become a necessity for every household. A good in-car environment not only prevents injury but also enhances driving comfort. As consumers pay more attention to in-car air quality, VOC testing is now required before vehicles leave the factory. Harmful substances in cars primarily come from VOCs (volatile organic compounds), such as formaldehyde, acetaldehyde, acrolein, benzene, toluene, ethylbenzene, xylene, and styrene.

[0060] However, the entire process of traditional VOC traceability methods is time-consuming. Vehicle VOC testing usually takes 4 days, component VOC testing usually takes 14 days, and material VOC testing usually takes 6 days. Moreover, it can only be carried out in a fixed laboratory location, which is time-consuming and very inconvenient.

[0061] In view of this, the present application provides a method and device for tracing the source of VOCs in a vehicle, which can quickly achieve VOC tracing and reduce time consumption.

[0062] First, as Figure 1 As shown, this application provides a method for tracing the source of VOC in a vehicle, comprising the following steps:

[0063] S100, obtaining the type and content of VOC in the vehicle and the weight coefficient of each VOC in the total VOC in the vehicle;

[0064] S200, obtaining the VOC type and content of each component in the vehicle based on the type of components in the vehicle, the amount of components used, and the exposure coefficient of the components;

[0065] S300, obtaining the contribution rate of the VOC of each component to the total VOC in the vehicle based on the type and content of the VOC of each component in the vehicle, the weight coefficient of each VOC in the total VOC in the vehicle, and the exposure coefficient of the component;

[0066] S400, determining at least one component with a high contribution rate as a target component based on the contribution rate of the VOC of each component to the total VOC in the vehicle;

[0067] S500. Obtain the weight coefficient of each VOC in the target component in the total VOC of the target component, the VOC types and contents of each material of the target component;

[0068] S600. According to the weight coefficient of each VOC in the target component and the VOC types and contents of each material of the target component, obtain the contribution rate of the VOC of each material in the target component in the total VOC of the target component;

[0069] S700. According to the contribution rate of the VOC of each material in the target component in the total VOC of the target component, determine that at least one material with a higher contribution rate ranking is the target material.

[0070] In this application, by the contribution rate of the VOC of each component in the total VOC in the vehicle, at least one component with a higher contribution rate ranking is determined as the target component, that is, a high-risk part for VOC emissions. After determining the high-risk part, the materials of the high-risk part are disassembled. According to the contribution rate of the VOC of each material in the total VOC of the component, at least one material with a higher contribution rate ranking is determined as the target material, that is, a high-risk material for VOC emissions, quickly obtaining the high-risk parts and high-risk materials, and then making targeted improvements. This solution can accurately locate the pollution source, only conduct in-depth disassembly tests on high-risk targets, reduce the ineffective detection of low-risk materials, reduce costs and resource waste, shorten the time for VOC traceability, and improve the efficiency of improving the in-vehicle air quality.

[0071] Combined with the first aspect, in some embodiments provided by this application, in the process of obtaining the VOC types, contents in the vehicle interior of the whole vehicle and the weight coefficient of each VOC in the total VOC in the vehicle interior, the method for obtaining the VOC types and contents in the vehicle interior of the whole vehicle includes the time-of-flight mass spectrometry method. The time-of-flight mass spectrometry method determines the mass-to-charge ratio (m / z) by measuring the flight time of ions in a vacuum flight tube. Using the time-of-flight mass spectrometry method can accurately identify complex mixtures, has the capabilities of rapid response and real-time monitoring, and can efficiently and quickly detect the VOC types and contents in the vehicle interior.

[0072] Combined with the first aspect, in some embodiments provided by this application, in the process of obtaining the VOC types, contents in the vehicle interior of the whole vehicle and the weight coefficient of each VOC in the total VOC in the vehicle interior, when obtaining the weight coefficient of each VOC in the total VOC in the vehicle interior, it satisfies:

[0073]

[0074] where, K i is the weight coefficient of the i-th substance in the vehicle interior in the total VOC in the vehicle interior;

[0075] C 0i is the concentration of the i-th substance in the vehicle interior;

[0076] n is the number of VOC species in the cab.

[0077] By calculating the weight coefficient of each VOC in the total VOC in the vehicle, it is possible to know which types of VOCs have higher concentrations among all the VOC species in the vehicle, and specific VOC species with high emission concentrations can be determined.

[0078] Combined with the first aspect, in some embodiments provided by the present application, in the method of obtaining the VOC species and content of each component in the vehicle according to the types of components in the vehicle, the usage amount of the components, and the exposure coefficient of the components, the method of obtaining the VOC species and content of each component in the vehicle includes measuring the VOC species and content of each component in the vehicle by using flying time mass spectrometry in a variable volume test chamber. The components are placed in the variable volume test chamber for time-of-flight mass spectrometry testing. By changing the volume of the gas in the in-cabin airbag, the size of the space in the chamber can be changed, and the corresponding relationship between the test chamber and the cab space can be established, making the sampling in an equal proportion to the actual situation and improving the measurement accuracy. For example, door seals with the same component composition material can be tested together.

[0079] Combined with the first aspect, in some embodiments provided by the present application, the contribution rate of the VOC of each component in the total VOC in the vehicle satisfies:

[0080]

[0081] where W is the contribution rate of the VOC of the component in the total VOC in the vehicle;

[0082] β is the component exposure coefficient, that is, the proportional coefficient of the exposed area of the component to the total area;

[0083] C i is the concentration of the i-th substance detected in the component;

[0084] K i is the VOC weight coefficient of the i-th substance in the vehicle;

[0085] n is the number of VOC species in the vehicle. Calculating the contribution rate of the VOC of each component in the total VOC in the vehicle can obtain the VOC emission level of each component. Usually, the component with a large contribution rate is a high-risk component with high VOC emissions. When calculating the contribution rate of the VOC of each component in the total VOC in the vehicle, the component exposure coefficient, that is, the proportional coefficient of the exposed area of the component to the total area, is considered, which can more accurately indicate the VOC emission level of the component. The area of the component can be measured by laminating. Attach a plastic film to the surface of the sample and use a marker pen to outline the contour of the exposed part. Flatten the plastic film and measure the size with a steel ruler or tape measure. Use mathematical formulas or drawing software to calculate the area of the soft component.

[0086] Combined with the first aspect, in some embodiments provided by the present application, when obtaining the weight coefficient of each VOC in the target component in the total VOC of the target component, the types and contents of VOCs of each material of the target component, when obtaining the weight coefficient of each VOC in the target component in the total VOC of the target component, it satisfies:

[0087]

[0088] where K i ’ is the weight coefficient of the i-th substance in the target component in the total VOC in the vehicle interior;

[0089] C 0i ’ is the concentration of the i-th substance in the target component;

[0090] n is the number of types of VOCs in the component.

[0091] By calculating the weight coefficient of each VOC in the target component in the total VOC of the target component, it is possible to determine which types of VOCs in the target component have higher concentrations, and it is possible to determine the specific types of VOCs with high emission concentrations.

[0092] Combined with the first aspect, in some embodiments provided by the present application, when obtaining the types and contents of VOCs of each material of the target part, it satisfies:

[0093] Material sampling amount = total material usage * sampling bag volume / vehicle interior space volume.

[0094] Considering that the ratio between the sampling bag volume and the space volume in the cab, i.e., the vehicle interior, is not necessarily 1:1, therefore, adjusting the material sampling amount according to the actual ratio can more accurately simulate the actual situation in the vehicle interior and improve the accuracy of data measurement. It should be noted that for a specific test vehicle model, the total material usage is provided by the vehicle manufacturer, and once the vehicle model is determined, the total material usage is also determined.

[0095] Combined with the first aspect, in some embodiments provided by the present application, when obtaining the contribution rate of the VOC of each material in the target part to the total VOC of the target component, it satisfies:

[0096]

[0097] where W’ is the contribution rate of the VOC of the material to the total VOC of the target component;

[0098] C i ’ is the concentration of the i-th substance detected in the material;

[0099] K i’ is the VOC weight coefficient of the i-th substance in the target component;

[0100] n’ is the number of VOC species in the target component.

[0101] By calculating the contribution rate of the VOC of each material in the target part to the total VOC of the part, it can be known which materials are high-VOC-emission materials in the parts with high VOC emissions, and then the materials with high VOC contribution can be determined, and specific materials can be improved.

[0102] Combined with the first aspect, in some embodiments provided by the present application, the component includes at least one of a seat, a door panel, a ceiling, an instrument panel, and a carpet. Generally, the above components have the risk of VOC emissions, and the high-risk components of VOC emissions can be screened out faster by testing the above components.

[0103] In the second aspect, as Figure 2 shown, the present application provides an in-vehicle VOC traceability device, including:

[0104] The first acquisition unit is used to acquire the VOC species, content in the vehicle interior of the whole vehicle, and the weight coefficient of each VOC in the total VOC in the vehicle interior;

[0105] The second acquisition unit is used to acquire the VOC species and content of each component in the vehicle interior according to the component types in the vehicle interior, the usage amount of the components, and the exposure coefficient of the components;

[0106] The third acquisition unit is used to acquire the contribution rate of the VOC of each component to the total VOC in the vehicle interior according to the VOC species and content of each component in the vehicle interior, the weight coefficient of each VOC in the total VOC in the vehicle interior, and the exposure coefficient of the components;

[0107] The first execution unit is used to determine at least one component with a top-ranked contribution rate as the target component according to the contribution rate of the VOC of each component to the total VOC in the vehicle interior;

[0108] The fourth acquisition unit is used to acquire the weight coefficient of each VOC in the total VOC of the target component, the VOC species and content of each material of the target component;

[0109] The fifth acquisition unit is used to acquire the contribution rate of the VOC of each material in the target part to the total VOC of the part according to the weight coefficient of each VOC in the target part and the VOC species and content of each material of the target part; and

[0110] The second execution unit is used to determine at least one material with a top-ranked contribution rate as the target material according to the contribution rate of the VOC of each material in the target part to the total VOC of the part.

[0111] The technical solution provided by this application will be described in detail below in conjunction with the embodiments.

[0112] Embodiment 1

[0113] Embodiment 1 of this application provides a method for tracing the source of VOCs in a vehicle. Taking a certain vehicle model as an example, it includes the following steps:

[0114] Measure the VOC components in the whole vehicle, mainly including formaldehyde, acetaldehyde, acrolein, benzene, toluene, ethylbenzene, xylene, and styrene. The results are shown in Table 1.

[0115] Table 1 VOC Content and Types in the Whole Vehicle

[0116] Component <![CDATA[Concentration (μg / m 3 )]]> Formaldehyde 153.24 Acetaldehyde 101.16 Acrolein 9.01 Benzene 8.34 Toluene 137.04 Ethylbenzene 231.12 Xylene 972.03 Styrene 72.14

[0117] Calculate the weight coefficient of each VOC in the vehicle's total VOC. The calculation formula is:

[0118]

[0119] Where K i is the VOC weight coefficient of the i-th substance in the vehicle, C 0i is the concentration of the i-th substance in the vehicle, and n is the number of VOCs in the driver's cab, n = 8. The calculation results are shown in Table 2.

[0120] Table 2 Weight Coefficient of Each VOC in the Vehicle's Total VOC

[0121] Component Weight Benzene 0.005 Toluene 0.081 Ethylbenzene 0.137 Xylene 0.578 Styrene 0.043 Formaldehyde 0.091 Acetaldehyde 0.060 Acrolein 0.005

[0122] Obtain the list of vehicle parts. Part of the list is shown in Table 3.

[0123] Table 3 List of Vehicle Parts

[0124] Serial number Part name Dosage Exposure coefficient 1 Instrument panel assembly 1 0.38 2 Lower instrument panel assembly 1 0.69 3 Door trim panel assembly 4 0.64 4 Front row seat assembly 2 1.00 5 Rear row seat assembly 1 0.62 6 Headliner assembly 1 0.54 7 Carpet assembly 1 0.42 8 Door seal 4 0.34

[0125] ** Perform VOC tests on each part. ND indicates not detected. The test results are shown in Table 4.

[0126] Table 4 VOC Test Results of Each Part

[0127]

[0128]

[0129] Calculate the overall contribution of part VOCs to vehicle VOCs and determine high-risk parts. The calculation formula is:

[0130]

[0131] Among them, β is the component exposure coefficient, that is, the proportional coefficient of the exposed area of the component to the total area, C i is the concentration of the i-th substance in the in-vehicle VOC detected in the component, K i is the VOC weight coefficient of the i-th substance in the vehicle interior, and n is the number of VOCs in the cab, n = 8. The results are shown in Table 5, and it can be determined that the top three risk components are the front seat assembly, the carpet assembly, and the rear seat assembly.

[0132] Table 5 Contribution rate of component VOCs to the total VOC in the vehicle interior

[0133] Serial number Part name Contribution rate Risk part ranking 1 Instrument panel assembly 49.4 5 2 Lower instrument panel assembly 34.4 6 3 Door trim panel assembly 29.0 7 4 Front row seat assembly 166.6 1 5 Rear row seat assembly 92.0 2 6 Headliner assembly 53.6 4 7 Carpet assembly 77.1 3 8 Door seal 7.9 8

[0134] Disassemble and analyze the high-risk components to calculate the high-risk materials. Taking the front seat as an example, calculate the weight coefficient of each VOC in the front seat in the total VOC of the front seat. The calculation method is:

[0135]

[0136] Among them, K i ’ is the weight coefficient of the i-th substance in the front seat in the total VOC of the front seat, C0 ′ i is the concentration of the i-th substance in the front seat, and n is the number of VOCs in the front seat, n = 8. The results are shown in Table 6.

[0137] Table 6 Weight coefficient of each VOC in the front seat in the total VOC of the front seat

[0138]

[0139]

[0140] Disassemble the front seat and use the bag method for VOC detection. The results are shown in Table 7.

[0141] Table 7 VOC types and contents of each material in the front seat

[0142]

[0143] Calculate the contribution rate of each material VOC in the front seat to the total VOC of the front seat, and determine the high-risk materials. The calculation method is:

[0144]

[0145] Among them, W’ is the contribution rate of the VOC of the material to the total VOC of the front seat;

[0146] C i ’ is the concentration of the i-th substance detected in the material;

[0147] K i ’ is the VOC weight coefficient of the i-th substance in the front-row seat;

[0148] n’ is the number of VOC types in the front-row seat, and n = 8.

[0149] The results are shown in Table 8, and it can be determined that the high-risk materials are: seat foam and seat cover.

[0150] Table 8 Contribution rate of VOC of each material in the front-row seat to the total VOC in the front-row seat

[0151] Serial number Part name Contribution rate Risk part ranking 1 Seat cover 133.9 2 2 Seat foam 285.7 1 3 Guard plate 54.4 3 4 Non-woven sound insulation cotton 30.7 4

[0152] Trace the VOC in the vehicle interior, and finally the first high-risk component obtained is the front-row seat assembly. The high-risk materials in the front-row seat assembly are seat cover and seat foam.

[0153] In summary, by the contribution rate of the VOC of each component to the total VOC in the vehicle interior, at least one component with a relatively high contribution rate is determined as the target component, that is, the high-risk part of VOC emission. After determining the high-risk part, disassemble the materials of the high-risk part. According to the contribution rate of the VOC of each material to the total VOC of the component, at least one material with a relatively high contribution rate is determined as the target material, that is, the high-risk material of VOC emission, so as to quickly obtain the high-risk part and high-risk material, and then make targeted improvements. This solution can accurately locate the pollution source, only conduct in-depth disassembly tests on high-risk targets, reduce the ineffective detection of low-risk materials, reduce costs and resource waste, shorten the time of VOC traceability, and improve the efficiency of improving the air quality in the vehicle interior.

[0154] In the description of this specification, the descriptions referring to terms such as "one embodiment / way", "some embodiments / ways", "example", "specific example" or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with that embodiment / way or example are included in at least one embodiment / way or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment / way or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments / ways or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments / ways or examples described in this specification and the features of different embodiments / ways or examples.

[0155] It should be noted that in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element. In this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and expressly defined.

[0156] The above are only specific embodiments of this application, which enable those skilled in the art to understand or implement this application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for tracing the source of VOC in a vehicle, characterized in that: The following steps are involved: Obtain the type and content of VOC in the vehicle and the weight coefficient of each VOC in the total VOC in the vehicle; Obtain the VOC type and content of each component in the vehicle based on the type of components, usage, and exposure factor of the components; Based on the VOC type and content of each component in the vehicle, the weight coefficient of each VOC in the total VOC in the vehicle, and the exposure coefficient of the component, the contribution rate of each component's VOC to the total VOC in the vehicle is obtained; Based on the contribution rate of VOC of each component to the total VOC in the vehicle, at least one component with the highest contribution rate is determined as a target component; Obtain the weight coefficient of each VOC in the target component in the total VOC of the target component, and the VOC type and content of each material of the target component; According to the weight coefficient of each VOC in the target part, the type and content of VOC of each material in the target part, the contribution rate of VOC of each material in the target part to the total VOC of the target part is obtained; According to the contribution rate of VOC of each material in the target part to the total VOC of the target part, at least one material with a higher contribution rate is determined as the target material.

2. The method for tracing the source of VOC in a vehicle as claimed in claim 1, characterized in that: In the method of obtaining the types and contents of VOCs in the whole vehicle and the weight coefficient of each VOC in the total VOCs in the vehicle, the method of obtaining the types and contents of VOCs in the whole vehicle includes time-of-flight mass spectrometry.

3. The method for tracing the source of VOC in a vehicle according to claim 1, wherein: In obtaining the type and content of VOC in the vehicle and the weight coefficient of each VOC in the total VOC in the vehicle, obtaining the weight coefficient of each VOC in the total VOC in the vehicle satisfies the following conditions: Among them, K i is the weight coefficient of the i-th substance in the total VOC in the car; C 0i is the concentration of the i-th substance in the car; n is the number of VOC types in the cab.

4. The method for tracing the source of VOC in a vehicle according to claim 1, wherein: The method of obtaining the VOC types and contents of each component in the vehicle based on the types of components in the vehicle, the usage of the components and the exposure coefficient of the components includes measuring the VOC types and contents of each component in the vehicle using flight mass spectrometry in a variable volume test chamber.

5. The method for tracing the source of VOC in a vehicle according to claim 1, wherein: The contribution rate of VOC of each component to the total VOC in the vehicle meets the following requirements: Where W is the contribution rate of VOC of components to the total VOC in the vehicle; β is the component exposure coefficient, which is the ratio of the component exposure area to the total area; C i is the concentration of the i-th substance detected in the component; K i is the VOC weight coefficient of the i-th substance in the car; n is the number of VOC types in the car.

6. The method for tracing the source of VOC in a vehicle according to claim 1, wherein: In obtaining the weight coefficient of each VOC in the target component in the total VOC of the target component, the VOC type and content of each material in the target component, and the weight coefficient of each VOC in the target component in the total VOC of the target component, the following conditions are met: Among them, K i ' is the weight coefficient of the i-th substance in the target component in the total VOC of the target component; C 0i ' is the concentration of the i-th substance in the target component; n is the number of VOC types in the target parts.

7. The method for tracing the source of VOC in a vehicle as claimed in claim 6, characterized in that: When obtaining the VOC type and content of each material of the target part, the following conditions must be met: Material sampling volume = total material usage * sampling bag volume / vehicle interior space volume.

8. The method for tracing the source of VOC in a vehicle as claimed in claim 1, wherein: When obtaining the contribution rate of VOC of each material in the target part to the total VOC of the target part, the following conditions must be met: Where W' is the contribution of the material's VOC to the total VOC of the target component; C i ' is the concentration of the i-th substance detected in the material; K i ' is the VOC weight coefficient of the i-th substance in the target component; n' is the number of VOC types in the target part.

9. The method for tracing the source of VOC in a vehicle according to claim 1, wherein: The components include at least one of seats, door panels, ceilings, dashboards and carpets.

10. A VOC tracing device in a vehicle, characterized in that: include: The first acquisition unit is used to obtain the type and content of VOC in the vehicle and the weight coefficient of each VOC in the total VOC in the vehicle; The second acquisition unit is used to obtain the VOC type and content of each component in the vehicle based on the type of components in the vehicle, the amount of components used, and the exposure coefficient of the components; The third acquisition unit is used to obtain the contribution rate of the VOC of each component to the total VOC in the vehicle based on the VOC type and content of each component in the vehicle, the weight coefficient of each VOC in the total VOC of the component, and the exposure coefficient of the component; The first execution unit is configured to determine, based on the contribution rate of VOC of each component to the total VOC in the vehicle, at least one component with a high contribution rate as a target component; A fourth acquisition unit is used to obtain a weight coefficient of each VOC in the target component in the total VOC of the target component, and a VOC type and content of each material of the target component; a fifth obtaining unit, configured to obtain a contribution rate of the VOC of each material in the target part to the total VOC of the target part based on a weight coefficient of each VOC in the target part and the type and content of the VOC of each material in the target part; as well as The second execution unit is used to determine at least one material with a higher contribution rate as the target material according to the contribution rate of the VOC of each material in the target part to the total VOC of the target part.

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