In terms of safety, you should be familiar with passenger car skins. The passenger car bag inflator is a device located in the passenger car bag. The passenger car leather bag is equipped with gas generators of different specifications. In the event of a vehicle collision, the gas generator inflates and expands the passenger car's leather bag to protect the passenger's safety. Let's take a look at the working principle of Xiao Wan's car leather bag generator.

1. Working principle of passenger car skin bag generator - background

In recent years, due to the related coordination deviation between passenger car skins and passengers in the process of use, passenger injury accidents have occurred from time to time, leading the world-renowned passenger car skin manufacturing companies such as Trina Solar (TRW), Discovery and Develop a new and more precise method of inflating passenger car skin bags. The two-stage gas generator has a good development prospect. There are many types of two-stage gas generators. Generally, "two-stage" gas generators are equipped with two starters to selectively generate different amounts of gas at different time periods. In fact, the deployment time between the two pilots can be varied according to different combinational relationships, resulting in an adjustable gas generation series (which may be called a "multi-stage" gas generator).

2. The working principle of passenger car bag generator

The passenger car bag at the driver is stored in the steering wheel pad. So when you see the words "SRS" or "airbag" marked on the steering wheel, you can see that the car is equipped with a passenger car skin bag. The passenger car bag system is mainly composed of sensors, microprocessors, gas generators, airbags and other major components.

The sensor and microprocessor are used to judge the degree of collision and send a signal; the gas generator generates ignition action according to the signal instruction, ignites the solid fuel and generates gas to inflate the airbag, so that the airbag rapidly expands. The airbag is installed in the steering wheel hub near the seat cushion and has a capacity of about 50 to 90 liters. The cloth used for the airbag has high tensile strength, and most of it is made of nylon. Dry powder is attached to the folding surface to prevent the car leather bag from sticking together and breaking when an explosion occurs; in order to prevent gas leakage, the inner layer of the airbag is coated. There is sealing rubber; at the same time, the airbag is equipped with a safety valve. When the airbag is over-inflated or the pressure in the airbag exceeds a certain value, the safety valve will automatically release part of the gas to avoid crushing passengers; the gas used in the airbag is mainly nitrogen.

3. Classification of working principle of car leather bag generator

(1) Two-stage gas pyrotechnics

Two-stage gas pyrotechnic gas generators feature two independent integral gas generators connected end-to-end.

(2) Two-stage gas storage

The two-stage gas storage generator consists of a single gas storage tank, and by changing the opening amount of the two pilot burners, different gas release amounts can be obtained.

(3) "Pressurized" gas generator

Some gas storage generators are equipped with small gas pyrotechnic devices with one or more pilot burners. The device heats the gas delivered to the gas generator and relies on this heating method to increase the pressure of the gas in the passenger car's bag. In a two-stage storage gas generator, the single-stage gas production is primarily determined by its own specifications and the vehicle manufacturer's performance evaluation criteria.