When the sensor detects a vehicle collision, the gas generator will ignition explosion reaction to produce nitrogen gas or compressed nitrogen filled bag is released, the passenger in contact with the air bag, the collision energy is absorbed by the buffer, thereby protecting the passenger.
Airbags as a passive safety device to protect the effect has been widely recognized, the first patent related to airbag began in 1958. Manufacturers have started to develop in 1970 can reduce the degree of injury crashes occupant airbags; 1980s, automobile manufacturers began equipped with airbags and other performance car parts
; into the 1990s, installed a sharp rise in the amount of airbags; and into the new century later, the car is equipped with airbags generally. Since the launch of airbags have saved many lives. Studies have shown that the car has an airbag device frontal crash, the driver of mortality, big cars decreased by 30%, 11% lower midsize sedans, small cars reduced by 20%.