Airbags are triggered under specific conditions designed to protect occupants during a collision. The key triggering conditions include:
Severity of Impact: Airbags typically deploy in moderate to severe frontal or near-frontal collisions. The onboard sensors detect sudden deceleration consistent with a crash, usually equivalent to hitting a solid barrier at about 12–18 mph (20–30 km/h) or more.
Direction of Collision:
Front airbags deploy during frontal or slightly off-center impacts.
Side airbags are triggered in side-impact collisions.
Curtain airbags may deploy during side impacts or rollovers.
Knee airbags activate similarly to front airbags to protect the lower limbs.
Sensor Input: Accelerometers, gyroscopes, and impact sensors located throughout the vehicle constantly monitor speed and movement. If they detect rapid deceleration or unusual force, they signal the airbag control unit (ACU) to deploy the airbags.
Seatbelt Usage: In many systems, airbags are designed to work in conjunction with seatbelts. Some systems may adjust the deployment force or even suppress deployment if the seatbelt is not fastened.
Occupant Detection: Modern vehicles may use weight sensors to determine if a seat is occupied (especially for passenger airbags) and may suppress airbag deployment if a child or lightweight object is detected.
