What is the Working Principle of Airbags?

Airbag refers to a device that inflates the airbag to protect the occupant before the occupant has a secondary collision during a crash. As an auxiliary device of the occupant restraint device of the seat belt, the airbag is called Supplemental Restraint System, SRS. The airbag system is composed of an integral airbag module composed of an airbag and an inflating mechanism, a collision sensor system that senses a collision and sends out a deployment command to the airbag module, and a wiring harness that transmits the signal sent by the sensor.

Airbag Gas Inflator

Working principle

When the impact sensor detects an impact, the relevant control system will determine the extent of the crash to determine whether to trigger the inflator, which usually consists of a gas generating agent such as gasoline or explosives and an ignition device to form an inflatable module. For the safety of disposal, usually only high temperature is used to detonate the airbag. Because the impact process time is very short, the general airbag is about 25-35 milliseconds from triggering to completion of the inflation process. If the inflation time is too long, it will lose its effectiveness.

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