According to best auto websites and the best car buying websites, large amount of compressed gas in a small volume airbags forces to come out from the installation position with speed of 320km/h, over a period of 0.04 seconds, 5 times faster than an average blink speed of a person in best cars and trucks.
Airbag first appeared on cars in the 1990s to work in order to minimize injuries from traffic collisions caused, from the beginning only two airbags fitted to each car, up to now in a car equipped with 14 airbags. Along with that, airbag technology also has extremely modern improvements to optimize ability to protect occupants in vehicles.
In technical principle, airbag operate based on principle of force on impact sensor placed behind the head or body as the airbag inflates and can only be used only once in the car and forced to replace when used.
Originally, airbag fitted with thick plastic bag material, air pump and electrical mechanical sensor. Upon occurrence of a collision, the crash sensor in the car will close electrical circuit as pump pushes air into high-pressure airbags to inflate airbags help make passengers not impact directly with steering wheel or details on furniture table causing injury.
The Basic working principle of airbags in a car
However, as made of synthetic plastic fibers, airbags inflate with great speed and sometimes will make people sit injuries because airbag inflates inversely to create jet thrust force. In addition, some cases airbag inflates under too tight pressure or not inflates makes protecting passengers are meaningless.
By 2006, association of US car manufacturers have agreed provisions to mandatory minimum 4-8 fitted airbag on the vehicle, uses electronic sensor system and new materials for airbags. This is truly a revolutionary step of protection equipped with airbags.
From a sensor in hip and front, recent modern cars are equipped with cross-collision sensor, acceleration sensor, speed sensors, pressure sensors, rib and hip car pressure sensors, seat position sensors and airbag inflating force sensor to help protect vehicle occupants in collisions in all circumstances from all directions, including rollover. All sensors are transmitting to ECU and the main ECU will control airbag so as to minimize injury to person sitting in the car.
Modern vehicles are tested thoroughly airbag technology right from the design stage
Each airbag when triggered from ECU in collision situations will be combined with a launcher by electronic control system located in a layer of mixture of flammable sodium, Potassium Nitrate. When activated, the controller will make the compound on fire, burning will create a chemical reaction transformed compounds into sodium, hydrogen, oxygen gas that fills the airbags.
The final stage of the airbag after inflate is deflate, this process also takes place immediately after the process is completed inflated. The amount of gas will escape through the vents on the surface of the airbag, which also help victims avoid injury by greater impact. One other effect of deflate is the appearance of dust particles, which are mainly cornmeal and talcum powder with lubrication effect of airbags. However, with modern chemical technology, these lubricating materials airbags have been replaced with a gel material which is environmental friendly and non-irritating to user