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This standard is developed in accordance with the rules given in GB/T 1.1-2009 Directives for standardization - Part 1: Structure and drafting of standards.
Some of the elements of this standard may be the subject of patent rights. The issuing authority of this standard shall not be held responsible for identifying any or all such patent rights.
This standard was proposed by the C&AP Committee of SAE-China.
This standard is approved by the Society of Automotive Engineering of China.
This standard is under the jurisdiction of the Society of Automotive Engineering of China.
This standard was issued in March 2018 for the first time.
The sunlight simulation accelerated aging test method for the passenger vehicle
1 Scope
This standard specifies the test equipment, test samples, test period and conditions as well as test process for the sunlight simulation accelerated aging test for passenger vehicles.
It is applicable to the sunlight simulation accelerated aging test for passenger vehicles under the simulated environment conditions in the laboratory.
2 Normative references
The following standards are indispensable for the application of this document. For dated reference, subsequent amendments to (excluding any corrigendum), or revisions of, any of these publications do not apply. However, parties to agreements based on this specification are encouraged to investigate the possibility of applying the most recent editions of the documents indicated below.
GB/T 250 Textiles - Tests for color fastness - Grey scale for assessing change in color
GB/T 1766 Paints and varnishes - Rating schemes of degradation of coats
GB/T 8424.3 Textile - Tests for colour fastness - Calculation of colour differences
GB/T 8807 Test method for specular gloss of plastics
GB/T 9754 Paints and varnishes - Determination of specular gloss of non-metallic paint films at 20°, 60°and 80°
GB/T 15596 Plastics - Determination of changes in colour and variations in properties after exposure to daylight under glass, natural weathering or laboratory light sources
3 Terms and definitions
3.1 Hot-dry climate
Climate characterized by abundant sunshine, high temperature, dryness and little rain throughout the year, most typical in some tropical desert areas
3.2 Warm-wet climate
Climate characterized by high temperature, high humidity and much rain throughout the year, most typical in some tropical or subtropical warm-wet areas
3.3 Sunlight simulation accelerated aging test for the complete vehicle
Place the passenger vehicle in a test chamber of a certain dimension and equipped with control and monitoring equipment inside for the temperature, humidity, irradiance, etc. In a certain period of time, simulate the sunlight accelerated aging test of the complete vehicle under the natural conditions (hot-dry and warm-wet) by controlling and monitoring the temperature, humidity and irradiance in the test chamber and the vehicle, and inspect the aging state of the complete vehicle after the test
4 Test equipment
4.1 Test chamber
In order to ensure the uniformity of illumination and temperature in the test chamber, the volume of the test chamber shall not be less than 6.5m×4m×3.5m (length×width×height), the distance between the vehicle body and the chamber wall shall not be less than 1m, and the test chamber shall at least meet the temperature and humidity control under full illumination, with the temperature control range (-15~60)℃ and humidity control range (10%~70%) RH.
The lighting system shall meet the adjustable range that the total irradiation area is not less than 2m×5m, the irradiation height is not less than 1m, and the irradiation intensity is adjustable at (600~1 200)W/m2 [±(3~5)%]. Within the irradiation range, the illumination uniformity on the reference plane (25cm×25cm) is not more than 7.5%, and re-measurement is required after each replace of the light tube. Each light can be controlled and adjusted independently to facilitate local temperature compensation.
Notes: 1. The reference plane is generally 1.2m from the ground, and it is recommended to adopt the horizontal plane that is level with the upper surface of the instrument panel. The light uniformity measurement on the reference plane can be added as required. 2. The test chamber shall meet the requirements of relevant laws and regulations on environmental protection.
The full spectrum light source shall be metal halide lamp, and the spectrum shall at least cover the spectral radiation distribution of the full spectrum shown in Table 1.
Table 1 Spectral radiation distribution of full spectrum
Wave length
(nm) The total radiation level, expressed as a percentage of ground radiation (%) Permissible deviation
(%)
280~400 6.1 ±5
400~800 51.8 ±5
800~3 000 42.1 ±5
Note: Refer to Part 2-5 of IEC 68 for the spectral radiation distribution data of the full spectrum.
4.2 Acquisition equipment
Black-standard thermometer is recommended for temperature control and monitoring at key parts under direct illumination. As for other test pieces, T-type and K-type thermocouples can be stuck on their surface for measurement. The acquisition equipment shall at least meet the requirements below: T-type, K-type and PT100 are available and the storage time is not less than 30d when the minimum sampling frequency of 64 channels is 1s.
5 Test samples
5.1 Test prototype vehicle
5.1.1 Color requirements for prototype vehicle
For the test prototype vehicle, it is recommended to choose black appearance and dark interiors to obtain the harshest sunlight simulation loading conditions, or the configuration and color of the test prototype vehicle can also be determined through negotiation between relevant parties according to the test purpose.
5.1.2 State requirements for prototype vehicle
The test prototype vehicle shall be equipped with complete prototype parts, complete in collocation, perfect in color and patterns and full in use functions; the appearance of the complete vehicle shall be intact.
During the test, it is recommended to retract the sunshade in the driver’s position, open the sunshade in the second driver’s position, close the sunroof glass, and keep the sunshade of sunroof in semi-open state.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
3.1 Hot-dry climate
3.2 Warm-wet climate
3.3 Sunlight simulation accelerated aging test for the complete vehicle
4 Test equipment
4.1 Test chamber
4.2 Acquisition equipment
5 Test samples
5.1 Test prototype vehicle
5.1.1 Color requirements for prototype vehicle
5.1.2 State requirements for prototype vehicle
5.2 Reference samples
6 Test period and conditions
6.1 Hot-dry climate cycle test
6.1.1 Conditions
6.1.2 Conditions of single hot-dry climate cycle test
6.2 Warm-wet climate cycle test
6.2.1 Conditions
6.2.2 Conditions of single warm-wet climate cycle test
7 Test procedure
7.1 Test preparation
7.1.1 Vehicle inspection prior to test
7.1.2 Installation of acquisition equipment
7.1.3 Initial performance inspection
7.2 Test procedure
7.3 Inspection at end of test
8 Test report
Annex A Recommendation of black-standard control target temperature and air target temperature in drive cab as well as the distribution position
Annex B Recommended distribution position of temperature monitoring sensors in microenvironment conditions for complete vehicle test
Annex C Recommended position for inspecting the surface color of parts for complete vehicle test
Annex D Recommended position for inspecting the gloss and color difference of paint film of parts for complete vehicle test
Table 1 Spectral radiation distribution of full spectrum
Table 2 Conditions of hot-dry climate cycle test
Table 3 Conditions of single hot-dry climate cycle
Table 4 Conditions of warm-wet climate cycle test
Table 5 Conditions of single warm-wet climate cycle
Table A.1 Recommendation of black-standard control target temperature and distribution position
Table A.2 Recommendation of air target temperature and distribution position in drive cab
