method for triggering a passive occupant protection system for motor vehicles and passive occupant protection system for motor vehicles

摘要

The release method uses a storage capacitor (C) for providing the electrical current for simultaneous operation of a number of electrical detonation devices (Z1,...Z4), associated with respective airbags or seatbelt locking devices, upon failure of the vehicle battery supply voltage. The current for each detonation device is pulse width modulated, with the correct operating current for each detonation device determined by the pulse/pause ratio. The required operating current can be measured during the operation of the vehicle via the electrical resistance of each detonation device.