23/5000 When does the airbag pop, and how hard does it hit?

2024-09-19 11:22:55

Air bags are no stranger to everyone, not only is the primary consideration for people to buy a car, but also one of the hot words of this year's car. First, there was the "Takata airbag" recall, followed by the safety accident caused by the Inner Mongolia Highlander airbag not popping. As a passive safety configuration that every car has, it should beg for a life in emergency situations, but it may become the "culprit" of the disaster, which causes people to pay attention to the airbag, under what circumstances does the airbag pop off? And it's important to remember: airbags only reduce head injuries by 25%, and safe driving habits are far more important than a dozen airbags.

First we need to understand the working principle and composition of the air bag. The airbag is not a single inflatable air bag, but a whole system consisting of sensors + control units + inflatable air bags. When the vehicle crashes, the pressure acceleration sensors in the front and side of the car collect information, and then send it to the control unit (restraint system), and the controller determines the degree of collision through the set algorithm, and whether the airbag needs to be detonated. The airbag will be inflated within tens of milliseconds of the impact, the ignition control device will issue instructions to explode, and substances such as sodium azide (NaN3) or ammonium nitrate (NH4NO3) will quickly break down and fill the entire airbag to protect the safety of passengers.

The airbag is for a crash, but it doesn't necessarily deploy when you hit the car. Because it is not necessary, the blind opening of the air bag may cause secondary injury to the passengers or additional costs, after all, most cars have 4, some luxury cars plus side gas curtain and knee air bags have more than 8, hit once like a flower, and then the local rich can not stand this choice. Mainly, airbags also have the potential to accidentally injure passengers and drivers.

At what speed does the airbag deploy? The airbag will not open in minor collisions and bumps, and the airbag opening is also conditional:

1. Relative speed >50km/h, the collision instantaneous opposite direction, that is, the relative speed to >50km/h, the impact force to meet the production of this speed. Of course, the car companies are not the same set of airbag initiation conditions are not the same.

2. Impact Angle requirements: Only at the point of impact must be near the sensor, generally between 60° right and left in front of the vehicle, and the side airbag/air curtain sensor is near the door.

3. Collision with rigid walls or obstacles will pop the airbag, and hitting the sensor with hard objects such as a sledgehammer will not open, because the effect of the sensor is mainly caused by speed.

In addition, car maintenance reminds owners that the opening of the air bag is determined by the sensor and controller, not the seat belt, but the air bag must be used with the seat belt. The main reason is that when the air bag pops out at 60km/h, the speed of the air bag is about 5 times the speed of the speed of the car, up to 300km/h. If there is no seat belt to limit the movement of the passenger's body, the speed of the air bag can easily cause injury to the passenger, breaking the arm and neck is completely OK, which is why passengers under the age of 12 are not encouraged to be co-drivers.

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