What is a secondary airbag in a car
The secondary airbag is an auxiliary device for passive safety, part of the airbag system (SRS), installed inside a platform directly in front of the passenger seat. It works by rapidly inflating to form an air cushion to cushion the inertial impact of occupants in the event of a collision, reducing head and chest injury while preventing occupants from colliding with components .
Working principle
When a vehicle is subjected to a collision of a specific intensity, the collision sensor will trigger the electronic control unit (ECU) to instruct the gas generator to produce gas rapidly, causing the airbag to inflate and deploy within 0.01 to 0.11 seconds to form a cushioning air cushion. Airbags work together with seat belts to reduce risk of injury to occupants in collision .
Historical background and early applications
Early airbags were mainly distributed in the driver's and passenger's seats and on the sides of the vehicle, used to resist frontal collisions. With the advancement of technology, airbag systems have evolved to provide more comprehensive protection .
Youdaoplaceholder0 The core function of the front passenger airbag in a car is to create a buffer zone by rapidly inflating in the event of a collision, protecting the head and chest of occupants from direct impact and reducing the degree of injury. Youdaoplaceholder0, as a key component of passive safety systems, works with seat belts to reduce head injury rates by 25% and face injury rates by 80%.
Youdaoplaceholder0 Core protection mechanism
Youdaoplaceholder0 Collision buffering principle : When the collision sensor detects that the impact force exceeds the set threshold (typically with an acceleration change of >18g and a duration of >10ms), the gas generator completes the inflation within 30ms, forming an elastic air cushion to buffer the forward inertia of the occupants.
Youdaoplaceholder0 Hierarchical trigger strategy :
During low-speed collisions, only the first-stage gas generator ignites, generating less gas to achieve flexible buffering.
When there is a high-speed collision, the secondary generator starts with a delay (about tens to hundreds of milliseconds) to enhance the buffering effect.
Instructions for use
Youdaoplaceholder0 Necessary mating devices :
It must be used in conjunction with a seat belt. Using it alone may cause secondary injury.
When the seat belt is not fastened, the trigger threshold of the airbag decreases, making it more likely to detonate.
Youdaoplaceholder0 Protection against special populations :
Children under the age of 12 need to activate the secondary airbag locking function (which automatically closes by cutting off the circuit or pressure sensing).
Passengers under 140cm in height should avoid sitting in the front row.
Youdaoplaceholder0 System maintenance requirements :
The effectiveness of the airbag system needs to be tested after the repair.
If the airbag does not trigger after the collision, the entire set of devices needs to be replaced.
Airbag malfunctions can be activated, but it is not recommended. The car owner can find a safe place to pull over at an appropriate time and reconnect the positive and negative terminals of the car battery. If the airbag warning light no longer flashes after the wires are connected, the vehicle can continue to be used. However, if the warning light does not go out, it may be that there is a problem with the airbag sensor.
The automotive airbag system is composed of sensors, airbags, indicator lights and control computers, etc. While the airbag is working, another system is monitoring its operation at the same time.
The inflation process of an airbag generates gas through a chemical reaction of chemical substances. During this process, the chemical substances may get damp, and various plugs, grounding wires, etc. in the circuit may become loose. Sensors may also fail, etc. In short, the airbag system, like other important components of a car, can also encounter problems.
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