| 摘要 |
<p>A triggering unit for supplying electrical energy to an igniter (28) for inflating an inflatable restraining device in a vehicle has a storage capacitor (C1) which is connectable to an igniter (30) of the initiation element (28) by means of two switches (S1, S2) connected in series with the initiation element. Each switch (S1, S2) is closable independently of the other by means of an associated control device (CU1, CU2) which receive signals from respective sensors (SR1, SR2) and determine whether a crash condition has occurred. Only when both control devices (CU1, CU2) determine the occurrence of a crash condition simultaneously are both switches closed and energy is supplied to the initiation element (28). Each switch (S1, S2) is closable periodically, and the energy (ΔE) supplied to the initiation element (28) during simultaneous closure of the switches is less than the firing energy of the igniter (30). A capacitor (CF) in series with the igniter (30) ensures that the igniter cannot be fired by a d.c. voltage e.g. by a short-circuit to the vehicle battery.</p> |
