A vehicle interior air quality detection cabin and detection method

Abstract

The present invention provides a whole vehicle in-vehicle air quality detection cabin and detection method, including three cabin modules, namely, a cabin module, a passenger structure cabin module and a luggage compartment structure cabin module. The three cabin modules can be combined into a variety of standard vehicle frame models through the combination of different modules to simulate the cabin space of various types of vehicles; each cabin module is provided with a cabin door, an odor detection port and a cabin connection interface, the cabin door is used to deliver the automobile parts assembly involving odor or VOC that needs to be installed; the odor detection port is used to collect the gas in the cabin; the cabin interface is used to connect the cabin modules to each other; an installation structure is provided in the cabin module, which is used to install the automobile parts assembly involving odor or VOC that the corresponding cabin module needs to match. The present invention sets a modular structural cabin to combine into a variety of standard vehicle frame models, replaces the real vehicle to complete rapid detection, and achieves the purpose of reducing test vehicle resources and reducing the test cycle.

Description

Technical field:

[0001] The present invention belongs to the technical field of vehicle quality detection, and in particular relates to a vehicle interior air quality technology. Background technology:

[0002] With the upgrading of automobile consumption and people's desire to pursue a better life, my country's automobile consumers are gradually becoming more aware of automobile environmental protection. The number of consumer complaints about odors in cars is increasing. The perception of odors in cars has become one of the important factors for consumers to choose their intended car models and make purchasing decisions.

[0003] The current vehicle manufacturers' in-vehicle air quality testing methods generally require that after a vehicle is fully assembled and rolled off the production line, it is left to stand for a specified period of time (28±5 days) before being placed in a vehicle VOC / odor environment chamber for pretreatment to meet the specified requirements, and then the vehicle odor evaluation is performed to identify odors and VOC tests. The disadvantage of the current method is that it is necessary to wait until the vehicle is fully assembled and rolled off the production line and has stood for a sufficient period of time before testing can be performed. In the normal development process, it generally takes a waiting period of 2-3 months, and it is impossible to predict the vehicle's odor in advance, identify problems in advance, and make corrections. On the other hand, it is impossible to perform differentiated olfactory judgments on the various components in the vehicle in batches and identify the source of odor in the vehicle.

[0004] Patent document CN201510170251.9 discloses an odor detection cabin and a method for detecting automobile odor sources, which function is to improve the accuracy of detecting odor sources in the vehicle, but cannot solve the risk identification when the actual vehicle resources are not fully prepared but it is necessary to quickly identify whether the odor of the vehicle meets the standard, nor can it lock the source of the odor source in the vehicle space. Summary of the invention:

[0005] In order to solve the above problems, the present invention provides a vehicle interior air quality detection cabin and detection method, which provides a modular structural cabin and combines a variety of standard vehicle frame models to replace the actual vehicle to complete rapid detection, thereby achieving the purpose of reducing test vehicle resources and shortening the test cycle.

[0006] The technical solution of the present invention is as follows:

[0007] In a first aspect, the present invention provides a vehicle interior air quality detection cabin, which includes three cabin modules, namely, a cabin module, a passenger structure cabin module and a luggage compartment structure cabin module. The three cabin modules can be combined into a variety of standard vehicle frame models through the combination of different modules to simulate the interior space of the whole vehicle cabin of various models; each cabin module is provided with a cabin door, an odor detection port and a cabin connection port, the cabin door is used to deliver the automobile parts assembly involving odor or VOC that needs to be installed; the odor detection port is used to collect the gas in the cabin and the detection port is equipped with a detection port cover for sealing; the cabin connection port is used to connect the cabin modules to each other; an installation structure is provided in the cabin module, which is used to install the automobile parts assembly involving odor or VOC that needs to be matched with the corresponding cabin module.

[0008] The standard vehicle framework model includes hatchbacks and sedans, and various types of vehicles include sedans, SUVs, and pickup trucks.

[0009] The luggage compartment structural compartment module is divided into two types, Type I and Type II, which correspond to hatchback models and sedan models respectively according to size and space.

[0010] The passenger structure cabin module has a top hanging system for fixing sun visors, interior rearview mirrors, ceilings, skylights and other components; there are also side wall hooks for fixing sealing strips, pillars, door panels and other components; there are also bottom mounting points for fixing carpets, seats and other components.

[0011] The luggage compartment structural compartment module has side wall hooks for fixing the luggage compartment carpet, luggage compartment side carpet, luggage compartment tool box, etc., and bottom mounting points for fixing luggage compartment carpet, spare tire and other parts.

[0012] The cabin module has side wall hooks inside the cabin body for fixing cabin sound insulation cotton, etc.; there are also bottom mounting points for fixing corresponding parts.

[0013] The bottom of the cabin module, the passenger structure cabin module and the luggage compartment structure cabin module are provided with movable pulleys.

[0014] In a second aspect, the present invention provides a method for detecting the air quality in a vehicle, using the above-mentioned vehicle interior air quality detection cabin, the method comprising:

[0015] The automobile parts assemblies involving odor or VOC are installed in the corresponding positions of their respective cabin modules, and the passenger structural cabin module, the luggage compartment structural cabin module, and the cabin module structural cabin are combined together to simulate a complete vehicle.

[0016] The assembled cabin modules are placed as a whole in a standard environmental chamber for the whole vehicle, and gas is extracted from each cabin module using professional equipment.

[0017] The gases extracted from the corresponding cabin modules are placed in standard odor bags in turn to evaluate the odor of the entire vehicle.

[0018] The gases extracted from the corresponding cabin modules are placed in the VOC sampling tube in turn to conduct VOC substance analysis on the entire vehicle.

[0019] If the odor evaluation of the whole vehicle extract shows an odor that does not meet the requirements, the components in the whole vehicle can be placed in different cabin modules as described above in turn, the odor of each component can be detected in batches, and the odor of each component can be compared with the odor of the whole vehicle to obtain the similarity between the odor of each component and the odor of the whole vehicle, so as to quickly and efficiently lock in the target component.

[0020] If there are abnormalities in the numerical indicators of some VOC substances extracted from the whole vehicle, the parts in the whole vehicle can be placed in different whole vehicle odors as described above in turn, and the values ​​of corresponding substances in the VOC of each part can be tested in batches, and compared with the test values ​​of the whole vehicle, so as to quickly and efficiently lock in the target parts.

[0021] As can be seen from the above scheme, the present invention adopts a new modular structural cabin combination design. Various structural cabins can simulate the interior space of the whole vehicle cabin of sedans, SUVs, and pickup trucks through the combination of different modules. The corresponding various parts of the whole vehicle are assembled into the corresponding module cabin to assemble a vehicle model that can simulate and replace the real vehicle, thereby realizing the test that can be used to replace the real vehicle and quickly and efficiently conduct the whole vehicle odor / VOC test and odor source identification test, which has obvious advantages in reducing test vehicle resources (low carbon energy saving) and reducing the test cycle (improving efficiency). The different combination forms of the three types of cabins can simulate two-box / three-box fuel vehicles and two-box / three-box electric vehicles, respectively, and have the characteristics of high efficiency, convenience, and flexibility. At the same time, the present invention combines the odor intensity and odor comfort, and provides a new comprehensive evaluation method for the odor of the whole vehicle after integrating the two technical dimensions to improve the evaluation accuracy of the sensory quality of the odor of the whole vehicle. Description of the drawings:

[0022] Figure 1a This is the exterior stereogram of the vehicle structure cabin module assembly - Type I;

[0023] Figure 1b This is the exterior stereogram of the vehicle structure cabin module assembly - Type II;

[0024] Figure 2 A perspective view of a passenger structural cabin module provided by the present invention;

[0025] Figure 3 A three-dimensional view of the appearance of the passenger structure cabin module provided by the present invention;

[0026] Figure 4A perspective stereogram of a cabin module provided by the present invention;

[0027] Figure 5 A three-dimensional view of the appearance of the cabin module provided by the present invention;

[0028] Figure 6 A perspective view of a luggage compartment module (Type I) provided by the present invention;

[0029] Figure 7 A perspective view of the appearance of a luggage compartment module (Type I) provided by the present invention;

[0030] Figure 8 A perspective view of a luggage compartment module (Type II) provided by the present invention;

[0031] Fig. 9 A three-dimensional view of the appearance of the luggage compartment module (Type II) provided by the present invention;

[0032] Fig.10 A flow chart of the vehicle odor detection method provided by the present invention;

[0033] Fig.11 A flow chart of the vehicle VOC detection method provided by the present invention;

[0034] Fig.12 It is a structural schematic diagram of the whole vehicle structural cabin module combination steam placed in the whole vehicle standard environmental cabin.

[0035] Reference numerals:

[0036] A-Crew structural compartment module, B-1 luggage compartment module (Type I), B-2 luggage compartment structural compartment module (Type II), C-Cabin module

[0037] 1-cabin, 2-cabin door, 3-odor detection cover, 4-top hook, 5-side hook; 6-fixing threaded hole; 7-pulley; 8-cabin connection port; 9-luggage compartment connection port; 10-passenger structure compartment connection port;

[0038] Based on the requirements of the vehicle model to be tested, the corresponding vehicle structure cabin modules are combined. The corresponding relationship between the combined modules and vehicle model substitution is shown in Table 1.

[0039] Serial number Vehicle structure cabin module combination Corresponding alternative models 1 Crew cabin module + luggage compartment module (Type I) Three compartment car (fuel vehicle) 2 Crew cabin module + luggage compartment module (Type II) Hatchback (fuel vehicle) / SUV (fuel vehicle) 3 Crew cabin module + cabin module + luggage compartment module (Type I) Sedan (electric vehicle) 4 Crew cabin module + cabin module + luggage compartment module (Type II) Hatchback (electric vehicle) / SUV (electric vehicle) 5 Crew structural module Pickup Trucks Specific implementation method:

[0040] The structure of the present invention is described in detail below with reference to the accompanying drawings:

[0041] The present invention proposes a modular structure cabin combination, which can simulate the interior space of a sedan, SUV, or pickup truck by combining different cabin modules. Figure 1a and Figure 1b .

[0042] There are three different cabin modules, namely passenger cabin module A, luggage compartment module (Type I) B-1, luggage compartment cabin module (Type II) B-2, and cabin module C. Each cabin structure is equipped with a cabin door, an odor detection port, and a cabin connection port. The odor detection port is sealed with a detection port cover. The top and side of the cabin are equipped with hooks for installing the automotive parts assembly involving odor or VOC that needs to be matched with the corresponding module cabin.

[0043] Embodiment 1:

[0044] See also Figure 2 and Figure 3 It is a specific structural embodiment of the crew cabin module A, including: a cabin body 1, a hatch 2 is arranged on the left side of the cabin body, and the hatch is used to deliver the odor assembly parts that need to be installed. The odor detection port 3 is arranged on the right side to collect the gas in the cabin and the detection port is equipped with a detection port cover for sealing. Independent inward-opening windows are arranged at both the front and rear ends, serving as cabin body connection ports 8 for stable connection with other structural cabin modules. A top hook 4 is arranged on the top of the cabin body 1, a side hook 5 is arranged on the side wall, and a protruding installation thread point 6 is arranged on the bottom for installing matching automotive parts.

[0045] The top hook 4 of the passenger structure cabin module A includes a suspension rope and a hook body. The upper end of the suspension rope is fixed to the top of the cabin body, and the lower end is connected to the hook body. The above structure is used to fix sun visors, rearview mirrors, ceilings, skylights and other components.

[0046] The side wall hooks 5 of the passenger structure cabin module A are welded to the side wall support columns to fix sealing strips, columns, door panels and other components.

[0047] The bottom of the passenger structure cabin module A is designed with an M10×20 welding nut as a mounting thread point 6, which is used to fix the mounting point and is used in conjunction with nuts of the same specification to fix carpets, seats and other components.

[0048] A movable pulley 7 is provided at the bottom of the crew structure cabin module A for the movement of the staff.

[0049] Embodiment 2:

[0050] See also Figure 4 and Figure 5, is a specific structural embodiment of the luggage compartment structure cabin modules B-1 and B-2, including: a cabin body 1, a hatch 2 is arranged on the left side of the cabin body 1, and the hatch is used to deliver the odor assembly parts that need to be installed. The odor detection port 3 is arranged on the right side to collect the gas in the cabin and the detection port is equipped with a detection port cover for sealing. An independently openable window is arranged at the front end as a luggage compartment connection port 9 for docking with the passenger structure cabin module. The inner side wall of the cabin body is provided with a hook, and the bottom is provided with a protruding installation thread point for installing matching automobile parts.

[0051] The side wall hooks 5 of the luggage compartment structural compartment module B are welded to the side wall support columns to fix the luggage compartment carpet, luggage compartment side carpet, luggage compartment tool box, etc.

[0052] The bottom of the trunk structure compartment module B is designed with an M10×20 welding nut as a mounting thread point 6, which is used to fix the mounting point and is used in conjunction with a nut of the same specification to fix the trunk carpet, spare tire and other parts.

[0053] The luggage compartment structure cabin is divided into two types, corresponding to the hatchback model and the sedan model according to the size and space; a moving pulley 7 is provided at the bottom thereof for the staff to move.

[0054] Embodiment 3:

[0055] See also Figure 6 , Figure 7 , Figure 8 and Fig. 9 , is a specific structural embodiment of the cabin module C, comprising: a cabin 1, a hatch 2 is provided on the left side of the cabin 1, and the hatch is used to deliver the odor assembly parts that need to be installed. The odor detection port 3 is provided on the right side to collect the gas in the cabin and the detection port is equipped with a detection port cover for sealing. An independent inward-opening window is provided at the rear end as a passenger structure cabin connection port 10 for docking and connection with the passenger structure cabin module A. The inner side wall of the cabin is provided with a hook, and the bottom is provided with a protruding installation thread point for installing matching automotive parts.

[0056] The side wall hook 5 of the cabin module C is welded to the side wall support column to fix the cabin sound insulation cotton and the like.

[0057] The bottom installation thread point of the cabin module C is an M10×20 welding nut, which is used as a fixed installation point 6 in conjunction with the nut to fix corresponding components.

[0058] A movable pulley 7 is provided at the bottom of the cabin module C for the movement of the staff.

[0059] Embodiment 4:

[0060] This embodiment is aimed at detecting the air quality inside a car. Fig.10The method uses the three types of detection structural cabins provided in the above embodiments (need to be used in combination, see Table 1 for details), and also uses the whole vehicle standard environmental cabin, VOC collection system, odor detection bottle and drying box commonly used in the prior art. Among them, the whole vehicle standard environmental cabin is also called the whole vehicle volatile organic compounds (Volatile Organic Compounds, abbreviated as: VOC) standard environmental cabin.

[0061] The test method includes:

[0062] Step 1: Based on the requirements of the vehicle model to be tested, the corresponding vehicle structure cabin modules are combined. The corresponding relationship between the combined modules and vehicle model substitution is shown in Table 1 below;

[0063]

[0064]

[0065] Step 2: Based on the requirements of the vehicle model to be tested, install the corresponding components into the corresponding vehicle module.

[0066] Step 3: Complete the connection and assembly at the corresponding structural cabin module interfaces, and place the assembled vehicle structural cabin in the vehicle standard environmental cabin to simulate the vehicle odor substitution test requirements of the actual vehicle.

[0067] Step 4: The temperature in the standard environmental chamber of the whole vehicle is maintained at 25℃±2℃, the relative humidity is 50%±10%RH, and the air flow velocity is ≤0.3m / s; the background concentration of environmental pollutants: toluene ≤0.02mg / m3, formaldehyde ≤0.02mg / m3. Close the doors of each structural cabin, turn on the irradiation lamp so that the irradiation intensity in the center of the structural cabin reaches 400W / m2±50W / m2 within 5 minutes, and maintain the state for 4h±0.5h.

[0068] Step 5: Turn off the irradiation lamp and keep the temperature in the cabin at 23.0℃±2.0℃. The odor evaluator enters the standard environmental chamber of the whole vehicle, opens the odor cover of the structure cabin in batches, smells and inhales at least 3 times, and the smelling time is not less than 5s. After making a grade judgment and recording the odor type within 10s, the odor of the whole vehicle is evaluated, including a comprehensive evaluation of the odor intensity and odor comfort. Please refer to Table 2, Table 3, and Table 4:

[0069] Table 2 Odor intensity rating standards

[0070] Odor intensity level Odor intensity rating description Level 1 No smell, no odor Level 1.5 The smell is barely perceptible but difficult to distinguish Level 2 Can sense the presence of smell Level 2.5 The smell is clearly perceptible, not irritating Level 3 Smell is noticeable, slight irritation Level 3.5 The smell is noticeable and moderately irritating

[0071] Table 3 Evaluation criteria for odor comfort level

[0072] Odor comfort level Odor comfort description -0.5 Burnt smell, glue smell, solvent smell, foam smell, sour smell, pesticide smell Level 0 Plastic, leather, laundry detergent Level 0.5 Flowery, candyy, sweet, green tea, cucumber, milky

[0073] Table 4 Comprehensive evaluation criteria for odor

[0074] Note: The odor intensity levels of complete vehicles in the industry are basically concentrated between 2.0, 2.5, 3.0, and 3.5. This table only lists these four levels.

[0075]

[0076]

[0077] Embodiment 5:

[0078] This embodiment is aimed at the detection of automobile odor sources, and requires the use of the three types of detection structure cabins provided in the above embodiments (to be used in combination, see Table 1 for details), as well as the whole vehicle standard environmental cabin and VOC collection system commonly used in the prior art. Among them, the whole vehicle standard environmental cabin is also called the whole vehicle volatile organic compounds (VOC) standard environmental cabin.

[0079] See also Fig.10 , the detection method comprises:

[0080] Based on steps 1 to 5, the vehicle interior air quality evaluation is completed. The odor of the vehicle is evaluated according to Tables 2 and 3. It is assumed that the odor evaluation result of the vehicle is: the odor intensity is 2.5, the odor type has a floral scent, the comprehensive odor evaluation is level 2.0 and meets the target requirements, and the test is ended.

[0081] Based on steps 1 to 5, the vehicle interior air quality evaluation is completed. The vehicle odor is evaluated according to Tables 2 and 3. It is assumed that the odor evaluation result of the vehicle is: the odor intensity is 2.5, the odor type has a leather smell, the comprehensive odor evaluation is level 2.5 and meets the target requirements, and the test is ended.

[0082] Based on steps 1 to 5, the vehicle interior air quality evaluation is completed. The vehicle is evaluated for the odor of the vehicle according to Tables 2 and 3. Assuming that the odor evaluation result of the vehicle is: the odor intensity is 2.5, the odor type has a pesticide odor, and the odor comprehensive evaluation is 3.0 and does not meet the target requirements, then execute step 7 and subsequent steps:

[0083] Step 6: Separate the passenger compartment, luggage compartment and engine compartment of the test assembled vehicle to form separate structural compartments and confirm that the sealing is complete.

[0084] Step 7: Load the components to be installed in each structural compartment into this structural compartment in batches, and re-place each structural compartment in the standard environmental chamber of the whole vehicle, and repeat step 4.

[0085] Step 8: Turn off the irradiation lamp and maintain the temperature in the cabin at 23.0℃±2.0℃. Complete the odor evaluation of each component in each structural cabin in sequence according to step 6. Compare the odor evaluation results of the components in each structural cabin with the odor of the whole vehicle, and lock in the target components in each structural cabin with the odor type most similar to that of the whole vehicle.

[0086] Embodiment 6:

[0087] Fig.11 This is a workflow diagram of a method for detecting volatile organic compounds and aldehydes and ketones (VOC) in a car. The method uses the three types of detection structure cabins provided in the above embodiments (need to be used in combination, see Table 1 for details), and also uses the whole vehicle standard environmental cabin, VOC collection system, and sampling tube commonly used in the prior art. The whole vehicle standard environmental cabin is also called the whole vehicle volatile organic compounds (VOC) standard environmental cabin.

[0088] The test method includes:

[0089] Step 1: Based on the requirements of the vehicle model to be tested, the corresponding vehicle structure cabin modules are combined. The corresponding relationship between the combined modules and vehicle model substitution is shown in Table 1;

[0090] Step 2: Complete the connection and assembly at the corresponding structural cabin module interfaces, and place the assembled vehicle structural cabin in the vehicle standard environmental cabin to simulate the vehicle VOC alternative test requirements of the actual vehicle.

[0091] Step 3: The temperature in the standard environmental chamber of the vehicle is maintained at 25℃±2℃, the relative humidity is 50%±10%RH, and the air flow velocity is ≤0.3m / s; the background concentration of environmental pollutants: toluene ≤0.02mg / m3, formaldehyde ≤0.02mg / m3. Close the doors of each structural cabin, turn on the irradiation lamp so that the irradiation intensity in the center of the structural cabin reaches 400W / m2±50W / m2 within 5 minutes, and maintain the state for 4h±0.5h;

[0092] Step 4: Turn off the irradiation lamp and maintain the temperature in the cabin at 23.0℃±2.0℃. The VOC sampler enters the standard environmental cabin of the whole vehicle and uses the VOC collection system to connect to the structural cabin to complete the air collection work in the structural cabin.

[0093] Step 5: Benzene series substances are collected with TENAX tubes, and aldehydes and ketones are collected with DNPH tubes and sent to the laboratory. The volatile organic components are determined by thermal desorption / capillary gas chromatography / mass spectrometry. The aldehyde and ketone components are analyzed by solid phase adsorption / high performance liquid chromatography, and the evaluation results are compared with the VOC limit requirements for the whole vehicle to issue an evaluation result.

Claims

1. A vehicle interior air quality detection cabin, characterized in that: The vehicle comprises three cabin modules, namely, an engine room module, a passenger structural cabin module and a luggage compartment structural cabin module. The three cabin modules can be combined into a variety of standard vehicle frame models through the combination of different modules to simulate the interior space of the entire vehicle cabin of various models. Each cabin module is provided with a cabin door, an odor detection port and a cabin connection port. The cabin door is used for delivering the automobile parts assembly involving odor or VOC that needs to be installed; the odor detection port is used for collecting the gas in the cabin; the cabin connection port is used for connecting the cabin modules to each other; an installation structure is provided in the cabin module for installing the automobile parts assembly involving odor or VOC that needs to be matched with the corresponding cabin module.

2. The vehicle interior air quality detection cabin according to claim 1 is characterized in that: The standard vehicle framework model includes hatchbacks and sedans, and various types of vehicles include sedans, SUVs, and pickup trucks.

3. The vehicle interior air quality detection cabin according to claim 1, characterized in that: The luggage compartment structure compartment module is divided into two types: Type I and Type II, which correspond to hatchback models and sedan models according to their size and space.

4. The vehicle interior air quality detection cabin according to claim 1 or 2, characterized in that: The passenger structure cabin module has a top hanging system for fixing the sun visor, the interior rearview mirror, the ceiling, and the skylight; There are also side wall hooks to fix the weatherstrips, pillars, and door panels; There are also bottom mounting points to secure carpets and seats.

5. The vehicle interior air quality detection cabin according to claim 1 or 2, characterized in that: The luggage compartment structural compartment module has side wall hooks for fixing the luggage compartment carpet, luggage compartment side carpet, and luggage compartment tool box, and bottom mounting points for fixing the luggage compartment carpet and spare tire.

6. The vehicle interior air quality detection cabin according to claim 1 or 2, characterized in that: The cabin module has side wall hooks inside the cabin body for fixing cabin sound insulation cotton; and bottom mounting points for fixing seats and carpets.

7. The vehicle interior air quality detection cabin according to claim 1 or 2, characterized in that: The bottom of the cabin module, the passenger structure cabin module and the luggage compartment structure cabin module are provided with movable pulleys.

8. A method for detecting the air quality in a car, characterized in that: The vehicle interior air quality detection cabin according to any one of claims 1 to 7 comprises: The automobile parts assembly involving odor or VOC are installed in the corresponding positions of their respective cabin modules, and the passenger cabin module, luggage compartment cabin module, and engine compartment cabin module are combined together to simulate a complete vehicle; Place the assembled cabin modules as a whole in a standard environmental chamber for the vehicle, and extract gas from each cabin module using professional equipment; The gases extracted from the corresponding cabin modules are placed in standard odor bags in turn to evaluate the odor of the entire vehicle; The gases extracted from the corresponding cabin modules are placed in the VOC sampling tubes in turn to analyze the VOC substances in the vehicle; If the extracted whole vehicle odor evaluation shows an odor that does not meet the requirements, the components in the whole vehicle can be placed in different cabin modules as described above in turn, the odor of each component can be detected in batches, and the odor of each component can be compared with the odor of the whole vehicle to obtain the similarity between the odor of each component and the odor of the whole vehicle, so as to quickly and efficiently lock the target component; If there are abnormalities in the numerical indicators of some VOC substances extracted from the whole vehicle, the parts in the whole vehicle can be placed in different whole vehicle odors as described above in turn, and the values ​​of corresponding substances in the VOC of each part can be tested in batches, and compared with the test values ​​of the whole vehicle, so as to quickly and efficiently lock in the target parts.

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