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Chery A15 Maintenance Manual
Section Two: Working Principle of Airbag System
I. Working Principle of SRS When the vehicle collides with other objects, the collision between vehicle and the other object is called primary collision, after which vehicle speed will be rapidly decreased, while the driver and passengers will move forward due to inertia force and collide with steering wheel, windshield or dashboard and other inside components, this is called secondary collision. Secondary collision is the major cause of the driver’s injuries in vehicle accidents. To relieve or avoid driver’s injuries in secondary collision, some passive protection units such as safety belts and airbag are equipped in vehicles. The purpose of airbag design is to quickly form an air cushion between driver and inside components during the short period of time (50ms) between primary and secondary collisions, as shown in the figure, to support driver’s head and chest with an air cushion and absorb the kinetic energy produced by body inertia with damping action of the airbag, so as to protect driver’s body.
Activated airbag system
Airbag system is a safety unit to be used together with safety belt. Airbag dose not replace safety belt in its function. Driver must always wear safety belts with proper tightness.
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