How Airbag WorksBernardo Gomes
The airbag saves thousands of lives and amazes at its speed when inflating. So how does the airbag inflate so fast? Speed Recovery answers this to you:
1. The sudden deceleration of the car in a collision activates the airbag device. With speed sensors, the electronic control unit sends an electrical signal to the ignitor of the gas generator – the one responsible for inflating the bag.
2. The ignitor acts as a fuze. Inside the gas generator, this pyrotechnic device causes substances like ammonia and guanidine nitrates to react and explode instantly. This combustion technology is so exquisite that it can be compared to that used in launching rockets.
3. The chemical reaction generates enough nitrogen to fill the bag (which can be between 60 and 90 liters) in only 30 milliseconds. This means that it is possible to fill an airbag 33 times in a single second.
4. Pushed by the expansion of the gas, the cover opens in several parts from the center, like a bud of rose that unbutton. This cover is made of a special plastic that is 2 to 3 mm thick and has small grooves of 0.5 cm. It is these grooves that guarantee that the material will break in the desired places and that no piece of plastic will strike the passenger.
5. The airbag begins to empty to absorb the impact of the body. This is because the shock against an inflation-inflated airbag would be as bad as hitting the dashboard. Emptying is done through holes positioned at the back or side of the bag.
The impact of a vehicle crash at 50 mp / h against a wall is the same as a car crashing from the 10th floor when it hits the ground.