Road vehicle - Airbag components - Part 3: Testing of inflator assemblies
Caution: There is a possibility of accidental firing of the airbag during any of the tests described in this part of GB/T 19949. Appropriate precautions should therefore be taken both in terms of handling the module and in terms of the design of test equipment.
1 Scope
This part of GB/T 19949 establishes uniform test methods and specifies environmental procedures and requirements for the inflator assemblies of airbag modules in road vehicles.
Note: For testing of the inflator assembly as part of the airbag module, see GB/T 19949-2.
2 Normative references
The following standards contain provisions which, through reference in this part of GB/T 19949, constitute provisions of this part. For dated references, subsequent amendments (excluding corrections) to, or revisions, of any of these publications do not apply.However, all parties coming to an agreement according to this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest editions apply to this part.
GB/T 19949.1 Road vehicle-Airbag components - Part 1: Vocabulary (GB/T 19949.1-2005, ISO 12097-1:2002, IDT)
ISO 6487 Road vehicles - Measurement techniques in impact tests - Instrumentation
ISO 11452 (all parts) Road vehicles - Component test methods for electrical disturbances from narrowband radiated electromagnetic energy
IEC 60068-2 Environmental testing - Part 2: Tests
3 Terms and definitions
For the purposes of this part of GB/T 19949, the definitions given in GB/T 19949.1 and the following definitions apply.
3.1
trigger device
device that activates the inflator assembly (IA)
4 General Requirements
The IA shall be designed such that, when handled appropriately, no dangers arise for persons or objects. The IA manufacturer shall produce and make available appropriate handling instructions.
The gas concentrations and the amount of particles measured immediately after the ignition of an IA (or complete module) shall not occur in concentrations that, with the current state of knowledge, can be considered as toxic to humans within 30 min of exposure in an enclosed room having a volume of 2.5 m3.
The gas and particulates arising from the ignition of an IA (or complete module) shall not have a strong irritating effect on a person.
The IA, complete with squib, if applicable, shall not be ignited by electromagnetic coupling or interference voltages.
5 General test conditions
5.1 Purpose of environmental testing
Environmental tests simulate the effects of environmental loads on the IA with respect to its functional behaviour, and service life.
They are based on the typical life-cycle of an IA covering shipping, storage, mounting on the module, operation, maintenance and repair of the vehicle.
The complete environmental test programme is composed of individual test methods which simulate automobile-related influences such as mechanical shocks and vibration, heat, cold and humidity.
Simulating the total service life may require more severe test levels than those seen in real world conditions to accelerate ageing and degradation processes.
The environmental test programme for IAs as specified in this part of GB/T 19949 shall be a minimum requirement to ensure the verification of its environmental robustness.
Table 1 gives an overview of the complete test programme applied to three identical test samples.
Table 2 lists the performance tests which shall be applied to three exposed samples and nine (or ten, see 7.4.4)unexposed samples.
Foreword I
1 Scope
2 Normative references
3 Terms and definitions
4 General Requirements
5 General test conditions
5.1 Purpose of environmental testing
5.2 Test sequence
5.3 Measurements and test report
5.4 Test programme
6 Environmental testing
6.1 General
6.2 Drop test
6.3 Mechanical impact test
6.4 Vacuum test
6.5 Simultaneous vibration and temperature test
6.6 Thermal humidity cycling
7 Performance testing
7.1 Electrostatic discharge (ESD) test
7.2 Electromagnetic compatibility (EMC) test
7.3 Tank test
7.4 Bonfire test
7.5 Trigger device testing
7.6 Burst test
Annex A (Normative) Definition of temperature build-up time te
Annex B (Informative) Survey of origin of environmental test procedures
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