Function

Function sequence







1 When the actuation threshold for the driver airbag is exceeded an electric pulse (triggering pulse) is transmitted to the squib in the gas generator by the emergency tensioning retractor and airbag control module.
2 The squib ignites the solid fuel in the gas generator. The solid fuel combusts developing a gas which explodes under high pressure into the airbag through a filter.
3 The airbag folded together on the gas generator inflates and the pressure of the gas flowing in tears open the steering wheel cushion at a predetermined breaking point.







4 While continuously inflating the airbag exits from the predetermined breaking point inflating to its maximum volume.







5 After approx. 45 ms the airbag reaches its maximum volume.
6 When the maximum volume is reached the pressure in the airbag starts decreasing immediately. The gas escapes from the airbag through a filter and the airbag deflates.