Evaluation method for aging resistance of whole automobile

Abstract

The invention discloses a method for evaluating the aging resistance of a whole automobile, and the method is suitable for evaluating the aging resistance of the whole automobile, and comprises the following steps: S1, building a multi-dimensional three-stage evaluation system which comprises a sensory item, a function item and a health item; s2, determining a whole vehicle assessment item; s3, obtaining the measurement value of each assessment item based on the test working condition; and S4, based on the measured value of each assessment item, calculating an anti-aging performance comprehensive evaluation score, and carrying out comprehensive evaluation on the anti-aging performance of the whole vehicle. According to the invention, a full-spectrum whole-vehicle artificial accelerated aging test is taken as a main test mode, a sensory item, a functional item and a health item are set as three evaluation dimensions, the aging resistance of the automobile product is comprehensively evaluated from the aspects of use experience, use safety, use health and the like, and the evaluation dimensions are multiple, so that the evaluation is more objective and comprehensive.

Description

Technical Field

[0001] The present invention relates to automobile performance testing technology, and in particular to a method for evaluating the aging resistance performance of a complete automobile. Background Art

[0002] Automobile aging resistance performance evaluation is an important testing item related to automobile product quality. Consumers need comprehensive automobile aging performance evaluation procedures, and the automobile industry needs more comprehensive automobile aging performance evaluation procedures.

[0003] The full-spectrum artificial accelerated aging test for whole vehicles uses an artificially simulated full-spectrum solar radiation lamp as the light source. The test sample vehicle is exposed to a test chamber with a temperature field, humidity field, and light radiation field. The combined effect of high temperature, high humidity, and high radiation coupling fields in a short period of time is used to accelerate sample aging, simulating the user's long-term natural aging process, thereby evaluating the test sample vehicle's aging resistance.

[0004] Currently, many automakers, both domestically and internationally, have established their own aging performance testing and evaluation systems based on artificial accelerated aging tests. However, these systems primarily focus on evaluating the aging performance of individual components. They lack comprehensive vehicle-level aging resistance evaluation rules, and thus fail to fully demonstrate the overall aging resistance of a vehicle. Furthermore, different automakers have varying aging resistance requirements for their products, leading to incomplete or inconsistent aging test methods, evaluation indicators, and criteria. The industry also lacks corresponding evaluation standards. Therefore, there is a need to strengthen the standardization of aging resistance evaluations to provide clearer guidance to the industry. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention proposes a new method for evaluating the aging resistance of a whole vehicle. This method uses a full-spectrum light source to simulate sunlight exposure, adopts a daily cycle working condition, and comprehensively considers multiple dimensions of consumer experience, safety of use, and health of use in the analysis, so as to make the aging resistance test and evaluation of the whole vehicle more comprehensive. At the same time, this technology gives a comprehensive evaluation score and star rating based on the whole vehicle, which can intuitively compare the aging resistance performance in an overall horizontal manner. This technology will provide an aging resistance performance evaluation scale for the automotive industry, and point out the direction for automotive product improvement, quality improvement, material selection, research and development design, and at the same time it will be beneficial for national quality inspection departments to supervise and manage the quality of automotive products, and can provide a reference for consumers to purchase products.

[0006] The technical solution adopted by the present invention is as follows: A method for evaluating the aging resistance of a complete vehicle comprises the following steps:

[0007] S1. Establish a multi-dimensional three-level evaluation system, including:

[0008] First-level evaluation indicators: sensory items, functional items, and health items;

[0009] The sensory item refers to the evaluation of aging phenomena, which is divided into two levels of evaluation indicators, including: visual items and tactile items of perception;

[0010] There are three levels of indicators under the visual item, including: high visibility, medium visibility, and low visibility;

[0011] Functional items refer to the evaluation of failure risk;

[0012] The health item refers to the evaluation of volatile harmful substances in the car;

[0013] S2. Determination of vehicle assessment parts / items;

[0014] Determine the assessment areas / items based on the assessment characteristics of sensory items, functional items, and health items;

[0015] S3. Based on the test conditions, obtain the measurement and inspection results of each assessment part / item;

[0016] S4. Based on the measurement and inspection results of each assessment part / item, calculate the comprehensive evaluation score of aging resistance and conduct a comprehensive evaluation of the aging resistance of the entire vehicle:

[0017] The comprehensive evaluation score of aging resistance is calculated as follows:

[0018] C=ω1S+ω2F+H

[0019] C——comprehensive evaluation score of aging resistance;

[0020] ω1——weight of sensory item index;

[0021] S——comprehensive evaluation score of sensory items;

[0022] ω2——weight of functional item indicator;

[0023] F——comprehensive evaluation score of functional items;

[0024] H——Comprehensive evaluation score of health items.

[0025] In the above steps, the method for calculating the comprehensive evaluation score of sensory items is as follows:

[0026] 1.1) Aging rating

[0027] First, a certain level of gradation is set for the manifestation characteristics of aging phenomena;

[0028] Secondly, the aging of each component in the sensory items is comprehensively graded. The specific method is: first, each component is graded individually for different types of aging phenomena, and then the maximum value of the individual grading is taken as the comprehensive aging grade of the component;

[0029] 1.2) Determine the visibility of the three-level indicators of sensory items

[0030] According to the comprehensive aging level, the visibility of each aging phenomenon is determined, and statistics are collected for high visibility areas, medium visibility areas, and low visibility areas, and different weights are assigned;

[0031] 1.3) Calculate the secondary indicator value based on the tertiary indicator

[0032] A. Calculate the visual score of the secondary indicator:

[0033] Calculate according to formula (1):

[0034]

[0035] Where:

[0036] V——visual item rating value;

[0037] k——the serial number of the third-level indicator, k=1, 2, 3 correspond to high, medium, and low visibility respectively;

[0038] θ k ——Indicator weight of the k-th visibility;

[0039] m——serial number of visual aging parts;

[0040] n——number of visual aging components;

[0041] R 1,1,k,m ——The comprehensive aging grade of the mth visual aging component in the kth visibility component. If the same component name contains more than one component, then R 1,1,k,m Take the maximum value;

[0042] Sn 1,1,k ——The upper control limit of the number of visual aging components of the kth visibility component;

[0043] Sd 1,1,k ——Upper control limit of the average grade of visual aging components of the kth visibility component;

[0044] B. Calculate the score of the secondary indicator tactile item:

[0045] Calculate according to formula (2):

[0046]

[0047] Where:

[0048] T——tactile item score;

[0049] m——serial number of tactile aging parts;

[0050] n——number of tactile aging parts;

[0051] R 1,2,m ——The comprehensive aging grade of the mth tactile aging component. If the same component name contains more than one component, then R 1,2,m Take the maximum value;

[0052] Sn 1,2 - Control limit on the number of tactile aging parts;

[0053] Sd 1,2 - Upper control limit of the average grade of tactile aging components;

[0054] The above quantitative upper control limits and average grade upper control limits are the upper limits of the natural fluctuation range generated by the 3σ principle of traditional quality control theory, and are obtained based on test data from multiple vehicle models in recent years.

[0055] 1.4) Calculate the primary indicator value based on the secondary indicator value

[0056] Calculate according to formula (3):

[0057] S=δ1V+δ2T (3)

[0058] Where:

[0059] S——comprehensive evaluation score of sensory items;

[0060] δ1——weight of visual item index;

[0061] V——visual item evaluation score;

[0062] δ2——weight of tactile item index;

[0063] T——Tactile item evaluation score.

[0064] In the above steps, the method for calculating the comprehensive evaluation score of the functional items is as follows:

[0065] First, the risk of the fault function item is graded, and then the evaluation score of the first-level indicator function item is calculated according to formula (4):

[0066]

[0067] Where:

[0068] F——comprehensive evaluation score of functional items;

[0069] m——fault function item number;

[0070] n——number of fault function items;

[0071] R 2,m ——Risk level of the mth fault function item;

[0072] Sn2——the upper control limit of the number of fault function items;

[0073] Sd2——the upper control limit of the average level of the fault function items; the average level is the average of the risk levels of all fault items, and the upper limit is greater than the average;

[0074] The above-mentioned quantitative control limits and average grade upper control limits adopt the upper limit of the natural fluctuation range generated by the 3σ principle of traditional quality control theory, and are obtained based on the test data of multiple vehicle models in recent years.

[0075] In the above steps, the method for calculating the comprehensive evaluation score of health items is as follows:

[0076] First, calculate the comprehensive index of the first-level indicator health item according to formula (5), and then determine the health item evaluation score according to the volatile compound comprehensive index scoring standard in the following table:

[0077] Volatile comprehensive index scoring standard

[0078] Volatile comprehensive index range Health evaluation score (H) <![CDATA[I sum ≤2]]> +3 <![CDATA[2<I sum ≤4]]> +2 <![CDATA[4<I sum ≤6]]> +1 <![CDATA[6<I sum ≤8]]> 0 <![CDATA[8<I sum ≤12]]> -1 <![CDATA[12<I sum ≤16]]> -2 <![CDATA[I sum >16]]> -3

[0079]

[0080] Where:

[0081] I sum ——Comprehensive index of health items;

[0082] C i ——The concentration value of the i-th volatile compound, where n is the type of volatile compound;

[0083] S i ——Concentration limit of the i-th volatile substance.

[0084] Furthermore, the weights mentioned in the present invention are calculated and determined using an entropy weight method.

[0085] The method for evaluating the aging resistance of a complete vehicle provided by the present invention has the following features and advantages:

[0086] 1. The present invention uses the full-spectrum vehicle artificial accelerated aging test as the main testing method, and the acceleration effect is obvious and repeatable.

[0087] Second, sensory items, functional items and health items are set as the three major evaluation dimensions, and a comprehensive evaluation of the aging resistance of automobile products is conducted from the aspects of usage experience, safety and health. The multiple evaluation dimensions make the evaluation more objective and comprehensive.

[0088] 3. A cyclic working condition with daily changes was used, and temperature, humidity and radiation values ​​that are more in line with humid and hot climates, dry and hot climates and low temperature environments were set to make the test conditions more in line with the actual usage scenarios of automobile users.

[0089] 4. The sampling and analysis of harmful substances in the air inside the car have been added to make the testing of the aging resistance of the entire vehicle more comprehensive.

[0090] 5. The three major evaluation dimensions are subdivided according to the perspectives of component visibility, user senses, and the number of components and functional items, making the evaluation more detailed and accurate, and more instructive for consumers. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] Figure 1 It is the evaluation system architecture for the aging resistance of the entire vehicle. DETAILED DESCRIPTION

[0092] The present invention is described in detail below with reference to the accompanying drawings and embodiments. Those skilled in the art should know that the following embodiments are not the only limitations on the technical solutions of the present invention, and any equivalent transformations or modifications made within the spirit of the technical solutions of the present invention should be deemed to fall within the scope of protection of the present invention.

[0093] The present invention provides a new method for evaluating the aging resistance of a complete vehicle, the main steps of which are as follows:

[0094] S1. Establish a multi-dimensional three-level evaluation system.

[0095] The evaluation system architecture of vehicle aging resistance performance is as follows: Figure 1 shown.

[0096] The present invention considers the aging resistance of the entire vehicle from three dimensions: user experience, user safety, and user health caused by vehicle aging. Therefore, the first-level evaluation indicators established include: sensory items, functional items, and health items.

[0097] 1. Sensory items

[0098] The aging of automobile products directly affects the sensory quality of the automobile and is closely related to consumers' perception, needs and expectations of the automobile. Therefore, a first-level evaluation indicator, sensory items, is established to evaluate the aging phenomenon of automobiles through sensory perception.

[0099] Judging from the existing data, users have different sensitivities to different aging phenomena, which can be perceived through vision or touch. Therefore, for each type of aging phenomenon, two secondary indicators, visual and tactile, are set under the sensory items.

[0100] In the secondary visual indicator, because users have varying degrees of sensitivity to aging on different parts / regions, the visual indicator is further divided into three tiers based on consumer visibility: high, medium, and low visibility. The tactile indicator, however, focuses on parts easily touched by users during use and therefore does not have a tertiary indicator.

[0101] Aging phenomena suitable for visual evaluation include: loss of gloss, discoloration, fading, yellowing, bronzing, blooming, expansion, warping, separation, shrinkage, wrinkling, blistering, tiger skin pattern, mildew, spots, crazing, cracking, fissures, pinholes, seepage, surface roughness, and peeling.

[0102] Aging phenomena suitable for tactile evaluation include: hardening, softening, brittleness, powdering, and stickiness.

[0103] In terms of the characteristics of aging phenomena, it can be divided into uniform aging and dispersed aging. Uniform aging is used to evaluate continuous or regular aging phenomena, and dispersed aging is used to evaluate discontinuous or locally irregular aging phenomena. Uniform aging is evaluated by the degree of aging, and dispersed aging is evaluated from two aspects: aging size and aging density.

[0104] Some aging phenomena are suitable for assessment by uniform aging degree, such as "loss of gloss, discoloration, fading, yellowing, gold-colored, frosting, expansion, warping, separation, shrinkage, wrinkling, crazing, cracking, pinholes, seepage, surface roughness, peeling, hardening, softening, brittleness, powdering, and stickiness."

[0105] Some aging phenomena are suitable for assessment using dispersed aging characteristics, such as "bubbling, tiger skin pattern, mildew, and spots", which assess the aging density and size.

[0106] Therefore, each aging phenomenon is rated based on its aging characteristics, evaluating the degree of degradation exhibited. A comprehensive aging rating is then determined for all aging phenomena present on a component. For example, for a component, each aging phenomenon is first rated. For example, if a component exhibits gloss loss, the degree of gloss loss is rated. The presence of cracks is then rated, and so on. After all aging phenomena have been rated, a comprehensive aging rating is determined.

[0107] Based on the aging level, the comprehensive evaluation score of the sensory items is further calculated. At the same time, in the three-level evaluation index system of sensory items, each evaluation indicator under each level is assigned a weight for the calculation of the comprehensive evaluation score.

[0108] 2. Functional items

[0109] Aging in automotive products can cause component degradation or damage, potentially leading to safety incidents. This is why functional item evaluation indicators are established. Functional item evaluation is an assessment of failure risk. This involves first rating each risk assessment item, assigning weights, and then calculating a comprehensive functional item evaluation score. Failure risk assessment items are customized based on the vehicle model and long-term testing.

[0110] 3. Health

[0111] The aging of automobile products will affect human health, among which the volatile organic compounds in the air inside the car have a particularly prominent impact on human health, so health evaluation indicators are set up. The eight volatile compounds obtained from the VOC test inside the car are the main harmful substances, mainly including benzene, toluene, xylene, ethylbenzene, styrene, formaldehyde, acetaldehyde, and acrolein.

[0112] The Ambient Air Quality Index (AQI) is a dimensionless index that describes the overall state of urban ambient air quality. It comprehensively considers the degree of pollution from pollutants, with higher AQI values ​​indicating a higher degree of pollution. This method uses the AQI calculation method to calculate the AQI. The concentrations of eight volatile compounds (VOCs) detected in the vehicle after the test are first calculated using a formula to derive a comprehensive index. The comprehensive health evaluation score for all volatile compounds is then calculated.

[0113] The scores of sensory and functional indicators at all levels are calculated by weighted summation and then added to the health score to obtain a comprehensive evaluation score.

[0114] S2. Determination of vehicle assessment parts / items.

[0115] The present invention assesses the aging resistance of the entire vehicle, so it is necessary to conduct a comprehensive assessment of the parts of the vehicle that are prone to aging.

[0116] 1) For sensory evaluation, components undergoing aging assessment are evaluated according to standard evaluation items, but customization is possible. Visually visible components are listed as visual evaluation items, such as "cabin inner panel," "two lid buffer blocks," "two lid locks and latches," "cabin," and "turn signal." Touchable components are listed as tactile evaluation items, such as "cabin inner panel," "front cabin inner panel," "cabin," and "turn signal." Of course, there will be overlap between visual and tactile evaluation items.

[0117] 2) For functional items, the same routine assessment items are followed. Common failure risks include: braking system, steering system, gear, instrument panel, battery system, wipers, reversing image, seats, seat belts, etc.

[0118] 3) For health, the air inside the vehicle is extracted and the concentration of benzotrialdehyde is measured.

[0119] S3. Based on the test conditions, obtain the measurement and inspection results of each assessment part / item.

[0120] Based on the established multi-project three-level evaluation system, test conditions are set, and basic data that need to be assessed are obtained before and after the test for subsequent comparative evaluation.

[0121] 1) For sensory items, the visibility of each visual assessment component is obtained from the three-level indicators. For example, among the 100 visual assessment components, the aging visibility of each component is recorded as "high visibility", "medium visibility" or "low visibility" based on human eye observation.

[0122] Then, for visual items, record the aging phenomenon of each component, such as the aging degree of "loss of gloss"; the aging degree of "discoloration, fading, yellowing, gold coloring, and frosting"; the aging size and aging density of "bubbling, tiger skin pattern, mildew, and spots"; and so on.

[0123] Then, for the tactile items, record the aging phenomenon of each component, such as the aging degree of "hardening, softening"; the aging degree of "brittleness, powdering"; and so on.

[0124] 2) For functional items, record various accident risk items, such as: (1) whether the brakes or steering fail; (2) whether the vehicle automatically switches to neutral or the instrument does not display during driving; (3) whether the charging is abnormal or the battery is running out; (4) whether the wipers fail or whether there is interference fluctuation in the image; (5) whether the seat heating button does not respond or whether the seat belt adjustment device is stuck, etc.

[0125] 3) For health items, the following items are recorded: sampling of hazardous substances in vehicle air according to Article 4 of HJ / T 400-2007, "Sampling and Determination Methods for Volatile Organic Compounds, Aldehydes and Ketones in Vehicles." Analysis of the sampling results according to Article 5 of HJ / T 400-2007, "Sampling and Determination Methods for Volatile Organic Compounds, Aldehydes and Ketones in Vehicles," and the concentration values ​​of pentanetrialdehydes (including benzene, toluene, xylene, ethylbenzene, styrene, formaldehyde, acetaldehyde, and acrolein) obtained through analysis.

[0126] S4. Conduct comprehensive analysis and evaluation based on the measurement and inspection results of each assessment area / item.

[0127] 1) Calculate the comprehensive evaluation score of sensory items.

[0128] 1.1) Aging rating.

[0129] First, for the uniform aging degree, dispersed aging density and aging size, a certain number of levels are set. In the algorithm, the uniform aging degree level i is set as Sj i , the dispersed aging density level i is Smi , the i-th level of dispersed aging size is Sd i ,Table 1-Table 3 examples each have 6 levels, and level 0 means no aging.

[0130] Table 1 Evaluation of uniform aging degree of sensory items

[0131] Individual level Degree of aging 0 No change, meaning no noticeable aging 1 Very mild, just noticeable aging 2 Mild, but noticeable aging 3 Obvious, that is, there is obvious aging 4 More serious, that is, there is greater aging 5 Very serious, that is, there is a lot of aging

[0132] Table 2 Evaluation of the dispersion aging density of sensory items

[0133] Individual level Aging density (i.e., damage density relative to the assessment surface) 0 No, that is, no visible aging 1 Very little, that is, just some noticeable aging 2 Little, that is, there is a small amount of noticeable aging 3 Moderate, i.e., a moderate amount of aging 4 More, that is, there are more aging 5 Intensive, that is, intensive aging

[0134] Table 3 Evaluation of the dispersion and aging of sensory items

[0135]

[0136]

[0137] Next, a comprehensive aging rating is performed on each sensory component. After individually rating each component for different types of aging phenomena, the maximum value of the individual ratings is taken as the comprehensive aging rating.

[0138] For example, if component A shows two aging phenomena, namely, loss of gloss and blistering, and the loss of gloss is rated as level 2, while the blistering is rated as level 3 (2) (density level 3 and size level 2), then the maximum comprehensive grade of component A is level 3.

[0139] 1.2) Determine the visibility of the third-level indicators of sensory items;

[0140] According to the comprehensive aging level, the visibility of each aging phenomenon under the visual sense is determined, and the high visibility area, medium visibility area, and low visibility area are statistically analyzed and assigned different weights.

[0141] 1.3) Calculate the secondary indicator value based on the tertiary indicator.

[0142] A. Calculate the visual score of the secondary indicator:

[0143] For the visual assessment component, since it has three levels of indicators "high visibility", "medium visibility" or "low visibility", its indicators are first given weights θ k Then, the score of the secondary indicator visual item is calculated, and the visibility weight distribution is shown in Table 4.

[0144] Table 4 Weight distribution of high, medium and low visibility components

[0145] Name of the third-level indicator <![CDATA[Weight (θ k )]]> High visibility <![CDATA[θ1]]> Medium visibility <![CDATA[θ2]]> Low visibility <![CDATA[θ3]]>

[0146] Calculate the visual score of the secondary indicator according to formula (1):

[0147]

[0148] Where:

[0149] V——visual item rating value;

[0150] k——the serial number of the third-level indicator, k=1, 2, 3 correspond to high, medium, and low visibility respectively;

[0151] θ k ——Indicator weight of the k-th visibility;

[0152] m——serial number of visual aging parts;

[0153] n——number of visual aging components;

[0154] R 1,1,k,m ——The comprehensive aging grade of the mth visual aging component in the kth visibility component. If the same component name contains more than one component, then R 1,1,k,m Take the maximum value;

[0155] Sn 1,1,k ——The upper control limit of the number of visual aging components of the kth visibility component;

[0156] Sd 1,1,k ——Upper control limit of the average grade of visual aging components of the kth visibility component.

[0157] B. Calculate the score of the secondary indicator tactile item:

[0158] There is no third-level indicator for the tactile item. The second-level indicator tactile item score is calculated according to formula (2):

[0159]

[0160] Where:

[0161] T——tactile item score;

[0162] m——serial number of tactile aging parts;

[0163] n——number of tactile aging parts;

[0164] R 1,2,m ——The comprehensive aging grade of the mth tactile aging component. If the same component name contains more than one component, then R 1,2,m Take the maximum value;

[0165] Sn 1,2 - Control limit on the number of tactile aging parts;

[0166] Sd 1,2——Upper control limit of the average grade of tactile aging components.

[0167] The above algorithms for the quantitative control limits and the average grade upper control limits adopt the upper limit of the natural fluctuation range generated by the 3σ principle of traditional quality control theory, and are obtained based on test data from multiple vehicle models in recent years.

[0168] 1.4) Calculate the sensory score of the first-level indicator based on the second-level indicator value.

[0169] According to the evaluation importance of visual and tactile items, weights are assigned. The comprehensive evaluation score of the first-level indicator sensory item is calculated according to formula (3):

[0170] S=δ1V+δ2T (3)

[0171] Where:

[0172] S——comprehensive evaluation score of sensory items;

[0173] δ1——weight of visual item index;

[0174] V——visual item evaluation score;

[0175] δ2——weight of tactile item index;

[0176] T——Tactile item evaluation score.

[0177] 2) Calculate the comprehensive evaluation score of functional items.

[0178] In light of the characteristics of vehicle aging testing, functional item assessment primarily assesses and grades the risk of functional failures in the test vehicle. The grading is based on the magnitude of the risk: lower risk, lower grade; higher risk, higher grade. Functional failure assessment items are customized by the tester, as shown in Table 5.

[0179] Table 5 Functional item failure risk level assessment

[0180]

[0181] Calculate the evaluation score of the first-level indicator function item according to formula (4):

[0182]

[0183] Where:

[0184] F——comprehensive evaluation score of functional items;

[0185] m——fault function item number;

[0186] n——number of fault function items;

[0187] R 2,m——Risk level of the mth fault function item;

[0188] Sn2——the upper control limit of the number of fault function items;

[0189] Sd2——Upper control limit of the average level of fault function items.

[0190] Similarly, the above algorithms for the quantitative upper control limits and the average grade upper control limits use the upper limit of the natural fluctuation range generated by the 3σ principle of traditional quality control theory, and are obtained based on test data from multiple vehicle models in recent years.

[0191] 3) Calculate the comprehensive evaluation score of health items.

[0192] First, calculate the comprehensive index of the primary indicator health item according to formula (5), and then determine the health item evaluation score according to Table 6:

[0193]

[0194] Where:

[0195] I sum ——Comprehensive index of health items;

[0196] C i ——The concentration value of the i-th volatile compound, where n is the type of volatile compound;

[0197] S i ——Concentration limit of type i volatile matter, see Article 4 of GB / T 27630.

[0198] Table 6 Volatile comprehensive index scoring standard

[0199] Volatile comprehensive index range Health evaluation score (H) <![CDATA[I sum ≤2]]> +3 <![CDATA[2<I sum ≤4]]> +2 <![CDATA[4<I sum ≤6]]> +1 <![CDATA[6<I sum ≤8]]> 0 <![CDATA[8<I sum ≤12]]> -1 <![CDATA[12<I sum ≤16]]> -2 <![CDATA[I sum >16]]> -3

[0200] 4) Finally, calculate the comprehensive evaluation score of aging resistance and give a rating.

[0201] The scores of sensory and functional indicators at all levels are calculated by weighted summation and then added to the health score to obtain a comprehensive evaluation score.

[0202] Calculate according to the following formula (6):

[0203] C=ω1S+ω2F+H (6)

[0204] C——comprehensive evaluation score of aging resistance;

[0205] ω1——weight of sensory item index;

[0206] S——comprehensive evaluation score of sensory items;

[0207] ω2——weight of functional item indicator;

[0208] F——comprehensive evaluation score of functional items;

[0209] H——Comprehensive evaluation score of health items.

[0210] The aging resistance is judged according to the comprehensive evaluation score of aging resistance. The higher the score, the better the aging resistance. A certain star rating can be given according to a certain score range, as shown in Table 7. The evaluation results include the comprehensive evaluation score and the corresponding star rating.

[0211] Table 7 Comprehensive evaluation scores and star ratings

[0212]

[0213] Furthermore, in the above calculations, regarding the determination of weights (θ, ω, δ), both aging test data and market user data are comprehensively considered, and the entropy weight method is used to calculate the indicator weights. Of course, other feasible methods can also be used.

[0214] The entropy weight method calculates the indicator weights as follows:

[0215] (i) First, take the original data of m samples and n indicators to form the data matrix X:

[0216]

[0217] (ii) Then normalize the positive range:

[0218]

[0219] (iii) Then calculate the numerical proportion P of the i-th sample under the j-th indicator ij :

[0220]

[0221] (iv) Calculate the entropy value e of the jth indicator j :

[0222]

[0223] (v) Finally, calculate the weight ω of the jth indicator j

[0224]

[0225] Furthermore, in the test, for sensory assessment items, instruments can be used to assist in measuring gloss, color, distinctness of image and coating thickness. During the visual evaluation process, if both the visual inspection results and the instrument measurement results are recorded at the same time, the instrument measurement results shall prevail.

[0226] Before the test, sensory assessment items, functional assessment items, and health assessment items are determined based on the structural and functional characteristics of the test prototype vehicle, and are graded and initially registered.

[0227] Then determine the test conditions and conduct the test:

[0228] 1. Perform a dry climate cycle with diurnal variations: Park the test vehicle in the environmental chamber, cut off the power, close all openings, use a full-spectrum light source, and test for 24 hours under dry climate conditions with diurnal variations. The operating conditions must meet the requirements of Table 8, and the spectral radiation distribution of the light source must meet the requirements of Table 9.

[0229] During this period, the vehicle will enter the environmental chamber at the 12th hour for a safety inspection.

[0230] The above working conditions are performed for 10-15 cycles with 24 hours as one cycle.

[0231] 2. Execute humid climate cycle conditions with diurnal variations: Similarly, park the test vehicle in the environmental chamber, cut off the power, close all openings, use a full-spectrum light source, and test for 24 hours under humid climate conditions with diurnal variations. The operating conditions must meet the requirements of Table 8, and the spectral radiation distribution of the light source must meet the requirements of Table 9.

[0232] During this period, the vehicle will enter the environmental chamber at the 12th hour for a safety inspection.

[0233] The above working conditions are performed for 10-15 cycles with 24 hours as one cycle.

[0234] Table 8 Cyclic operating conditions including daily changes

[0235]

[0236]

[0237] Table 9 Spectral radiation distribution

[0238]

[0239] 3. Perform a road driving condition according to the mileage allocation requirements in Table 10.

[0240] Table 10 Road driving test mileage distribution

[0241]

Claims

1. A method for evaluating the aging resistance of a complete vehicle, characterized in that: The steps include: S1. Establish a multi-dimensional three-level evaluation system, including: First-level evaluation indicators: sensory items, functional items, and health items; The sensory item refers to the evaluation of aging phenomena, which is divided into two levels of evaluation indicators, including: visual items and tactile items of perception; There are three levels of indicators under the visual item, including: high visibility, medium visibility, and low visibility; Functional items refer to the evaluation of failure risk; The health item refers to the evaluation of volatile harmful substances in the car; S2. Determination of vehicle assessment parts / items; Determine the assessment areas / items based on the assessment characteristics of sensory items, functional items, and health items; S3. Based on the test conditions, obtain the measurement and inspection results of each assessment part / item; S4. Based on the measurement and inspection results of each assessment part / item, calculate the comprehensive evaluation score of aging resistance and conduct a comprehensive evaluation of the aging resistance of the entire vehicle: The comprehensive evaluation score of aging resistance is calculated as follows: C=ω1S+ω2F+H C——comprehensive evaluation score of aging resistance; ω1——weight of sensory item index; S——comprehensive evaluation score of sensory items; ω2——weight of functional item indicator; F——comprehensive evaluation score of functional items; H——Comprehensive evaluation score of health items.

2. The method for evaluating the aging resistance of a complete vehicle according to claim 1, wherein: The method for calculating the comprehensive evaluation score of sensory items is as follows: 1.1) Aging rating First, a certain level of gradation is set for the manifestation characteristics of aging phenomena; Secondly, the aging of each component in the sensory items is comprehensively graded. The specific method is: first, each component is graded individually for different types of aging phenomena, and then the maximum value of the individual grading is taken as the comprehensive aging grade of the component; 1.2) Determine the visibility of the three-level indicators of sensory items According to the comprehensive aging level, the visibility of each aging phenomenon is determined, and statistics are collected for high visibility areas, medium visibility areas, and low visibility areas, and different weights are assigned; 1.3) Calculate the secondary indicator value based on the tertiary indicator A. Calculate the visual score of the secondary indicator: Calculate according to formula (1): Where: V——visual item rating value; k——the serial number of the third-level indicator, k=1, 2, 3 correspond to high, medium, and low visibility respectively; θ k ——Indicator weight of the k-th visibility; m——serial number of visual aging parts; n——number of visual aging components; R 1,1,k,m ——The comprehensive aging grade of the mth visual aging component in the kth visibility component. If the same component name contains more than one component, then R 1,1,k,m Take the maximum value; Sn 1,1,k ——The upper control limit of the number of visual aging components of the kth visibility component; Sd 1,1,k ——Upper control limit of the average grade of visual aging components of the kth visibility component; B. Calculate the score of the secondary indicator tactile item: Calculate according to formula (2): Where: T——score value of tactile item; m——serial number of tactile aging parts; n——number of tactile aging parts; R 1,2,m ——The comprehensive aging grade of the mth tactile aging component. If the same component name contains more than one component, then R 1,2,m Take the maximum value; Sn 1,2 - Control limit on the number of tactile aging parts; Sd 1,2 - Upper control limit of the average grade of tactile aging components; The above quantitative upper control limits and average grade upper control limits are the upper limits of the natural fluctuation range generated by the 3σ principle of traditional quality control theory, and are obtained based on test data from multiple vehicle models in recent years. 1.4) Calculate the primary indicator value based on the secondary indicator value Calculate according to formula (3): S=δ1V+δ2T(3) Where: S——comprehensive evaluation score of sensory items; δ1——weight of visual item index; V——visual item evaluation score; δ2——weight of tactile item index; T——Tactile item evaluation score.

3. The method for evaluating the aging resistance of a complete vehicle according to claim 1, wherein: The method for calculating the comprehensive evaluation score of functional items is as follows: First, the risk of the fault function item is graded, and then the evaluation score of the first-level indicator function item is calculated according to formula (4): Where: F——comprehensive evaluation score of functional items; m——fault function item number; n——number of fault function items; R 2,m ——Risk level of the mth fault function item; Sn2——the upper control limit of the number of fault function items; Sd2——the upper control limit of the average level of the fault function items; the average level is the average of the risk levels of all fault items, and the upper limit is greater than the average; The above-mentioned quantitative control limits and average grade upper control limits adopt the upper limit of the natural fluctuation range generated by the 3σ principle of traditional quality control theory, and are obtained based on the test data of multiple vehicle models in recent years.

4. The method for evaluating the aging resistance of a complete vehicle according to claim 1, wherein: The method for calculating the comprehensive evaluation score of health items is as follows: First, calculate the comprehensive index of the first-level indicator health item according to formula (5), and then determine the health item evaluation score according to the volatile compound comprehensive index scoring standard in the following table: Volatile comprehensive index scoring standard Where: I sum ——Comprehensive index of health items; C i ——The concentration value of the i-th volatile compound, where n is the type of volatile compound; S i ——Concentration limit of the i-th volatile substance.

5. The method for evaluating the aging resistance of a complete vehicle according to claim 1 or 2, wherein: The weight is calculated and determined using the entropy weight method.

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