Road vehicles - Lighting and light-signalling devices - Environmental endurance
1 Scope
This document specifies the requirements for environmental endurance tests of lighting and light-signalling devices in road vehicles (excluding retroreflective devices), including test requirements for thermal cycling tests, sealing tests, thermal shock tests, thermal deformation tests, salt spray tests, dust-proof tests, random vibration tests, shock and vibration tests, waterproof tests, tests for resistance to lubricating oil, fuel oil and cleaning fluids, light source irradiation tests, mist tests, highly accelerated life tests (HALT), highly accelerated stress screen (HASS) tests , focusing tests, etc.
The document is applicable to the lighting and light-signalling devices for Types M, N, O and L road vehicles.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 4599 Motor vehicle headlamps equipped with filament lamps
GB 4785 Prescription for installation of the external lighting and light-signalling devices for motor vehicles and their trailers
GB/T 6495.9 Photovoltaic devices - Part 9: Solar simulator performance requirements
GB/T 32466-2015 Accelerated stress testing procedures for electric and electronic products - Guidance for highly accelerated stress screen
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB 4785 and the following apply.
3.1
highly accelerated life test; HALT
test in which the stress tolerance limit of a product is determined by gradually increasing the test stress applied to the test sample
Note: The test stress includes temperature, vibration, rapid temperature change and combined stress of vibration, etc.
3.2
operating limit; OL
value of the test stress intensity that the test sample can withstand when its operating characteristics no longer meet the requirements of the product specifications, but the test sample can still return to normal operating characteristics after the test stress intensity is reduced
Note 1: Normal operating characteristics are defined by the manufacturer, such as normal lighting of the lamp, the integrity of the external light-transmitting surface, etc.
Note 2: The operating limit includes the upper limit and the lower limit. For vibration test, the operating limit includes only the upper limit.
3.3
destruct limit; DL
value of the test stress intensity that the test sample can withstand when its operating characteristics no longer meet the requirements of the product specifications, and the test sample cannot return to normal operating characteristics after the test stress intensity is reduced
Note: The destruct limit includes the upper limit and the lower limit. For vibration test, the destruct limit includes only the upper limit.
3.4
root mean square acceleration
Grms
positive square root of the integral of the acceleration spectral density function Sx(f) over a given frequency range
Note: See equation (1).
(1)
where,
Grms—the RMS acceleration, grms;
f1—the lower frequency over a given frequency range, Hz;
f2—the upper frequency over a given frequency range, Hz.
3.5
highly accelerated stress screen; HASS
accelerated stress test in which the test procedure is determined according to the operating limits and destruct limits identified through the HALT, and then applied to the product
4 Test requirement
4.1 For each test, brand-new samples can be used, or the same sample can be used for different test items according to the test requirements. The test sequence is shown in Annex A.
4.2 For the devices that are applicable to both 12 V and 24 V systems, the voltage condition of 24 V shall prevail as the test conditions.
4.3 Unless otherwise specified, the room temperature environment refers to the ambient conditions with a temperature of 23°C ± 5°C and a relative humidity of 25% to 75%.
4.4 Unless otherwise specified, the change in luminous intensity value means that the change in the light distribution value at the measuring points of the lighting devices or the light-signalling devices before and after the test is as follows:
a) High beam: HV point;
b) Low beam: 50R;
c) Front fog lamp: H = 0°, V = -2.5°;
d) Cornering lamp: (2.5D - 45L) or (2.5D - 45R);
e) Position lamp/reversing lamp/brake lamp/parking lamp/rear fog lamp/outline marker lamp/daytime driving lamp/side marker lamp/front turn signal lamp/rear turn signal lamp/slow driving lamp: HV point;
f) Side turn signal lamp: Direction A (H = 5°, V = 0°);
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Test requirement
5 Thermal cycling test
6 Sealing test
7 Thermal shock test
8 Thermal deformation test
9 Salt spray test
10 Dust-proof test
11 Random vibration test
12 Shock and vibration test
13 Waterproof test
14 Tests for resistance to lubricating oil, fuel oil and cleaning fluids
15 Light source irradiation test
16 Mist test
17 Highly accelerated life test (HALT)
18 Highly accelerated stress screen (HASS) test
19 Focusing test
Annex A (Informative) Recommended sequence of environmental endurance test
Annex B (Normative) Lighting method of lighting and light-signalling devices
Bibliography
