In order to ensure that the airbag is opened at an appropriate time, automobile manufacturers have stipulated the initiation conditions of the airbag. Only when these conditions are met, the airbag will explode. Although in some traffic accidents, the occupants in the car were hit with bloodshed, and even their lives were in danger, and the car was close to being scrapped, but if the airbag explosion conditions are not met, the airbag will not open.
Airbag deployment requires proper speed and collision angle. Theoretically speaking, only when the vehicle directly in front of the vehicle hits a fixed object at a position between about 60° from the left and right, at a speed higher than 30KM/h, can the airbag be opened. The speed mentioned here is not the speed of the vehicle as we usually understand it, but the speed at which the vehicle collides with a relatively rigid fixed obstacle in the test room. In the actual collision, the speed of the vehicle is higher than the test speed to open the airbag.
When a car crashes, the main stress parts are the bumper and the body rail. In order to buffer the impact of the collision, the front part of the car body is mostly designed with a collision buffer, and the stiffness of the car body is also uneven. In some accidents, such as when a car and a truck without rear guards have a drill-through collision, or a car rolls over after colliding with a guardrail, or a side collision of the car body, such accidents often do not have a direct collision with the front of the car body. The main reason is the collision between the upper part of the car body and the side. The rigidity of the collision body part is very small. Although the cabin has undergone great deformation, causing injury or death to the occupants in the car, sometimes the airbag cannot be opened due to the wrong part of the collision.