In terms of security, everyone should be familiar with it. Passenger car airbag The passenger‑car airbag gas generator is a device housed within the vehicle’s airbag. Bus airbags are equipped with gas generators of various specifications. In the event of a collision, the gas generator inflates and expands the airbag to help protect occupants. Let’s take a look at how the XIAOWAN automotive airbag gas generator works.

1. Passenger car airbag Generator Operating Principle – Background

In recent years, coordination discrepancies between passenger car airbags and occupants during use have led to frequent injury incidents. In response, leading global passenger car airbag manufacturers, such as TRW, have been exploring and developing a more precise new method for inflating these airbags. Two-stage gas generators hold promising prospects. Numerous types of two-stage gas generators exist. Typically, a “two-stage” gas generator is equipped with two initiators that selectively produce varying amounts of gas at different time intervals. In fact, the timing of deployment between the two initiators can be adjusted according to different configuration schemes, thereby yielding an adjustable series of gas‑generation outputs—referred to as a “multi‑stage” gas generator.

2. Operating principle of the passenger car bladder-type generator

In passenger vehicles, the airbag is housed within the steering wheel’s cushion. Therefore, when you see the “SRS” or “airbag” markings on the steering wheel, it indicates that the vehicle is equipped with an airbag system. The passenger‑car airbag system primarily consists of key components such as sensors, a microprocessor, a gas generator, and the airbag itself.

Sensors and microprocessors assess the severity of a collision and transmit signals; in response, the gas generator initiates an ignition sequence, igniting solid propellant to produce gas that inflates the airbag, causing it to expand rapidly. Airbags are mounted in the steering wheel hub near the seat cushion and typically have a volume of 50 to 90 liters. The fabric used for airbags boasts high tensile strength, with most versions made from nylon; its folded surfaces are coated with a dry powder to prevent the bag from sticking together and rupturing during deployment. To prevent gas leakage, the inner layer of the airbag is sealed with a rubber coating. Additionally, the airbag is equipped with a safety valve that automatically releases excess gas when inflation exceeds limits or internal pressure surpasses a set threshold, thereby avoiding injury to occupants. The primary gas employed in airbags is nitrogen.

3. Classification of the Working Principles of Car‑Type Bag‑Type Generators

(1) Two-stage gas pyrotechnics

The two-stage gas‑generating pyrotechnic device is equipped with two independent, integral gas generators connected end to end.

(2) Two-stage gas storage

The two-stage gas generator consists of a single gas storage tank, and by adjusting the opening degrees of the two igniters, different gas release rates can be achieved.

(3) “Pressurized” gas generator

Some gas‑powered generators are equipped with a small gas‑ignition device and one or more igniters. This device heats the gas supplied to the gas generator and relies on this heating method to increase… Passenger car airbag The pressure of the internal gas. In a two-stage gas generator, the performance of the single-stage gas generation is primarily determined by its own specifications and the vehicle manufacturer’s performance evaluation criteria.