| 摘要 |
An electronic system for activating a vehicle rider protection apparatus capable of preventing the erroneous activation caused by the failure or malfunctioning of the triggering circuit in the system. An acceleration sensor produces a vehicle acceleration signal, and it is processed independently by a digital signal processor and analog signal processing circuits, which produce trigger signals SA, SB and SD on detecting a collision of the vehicle. An OR gate takes logical sum of the signals SA and SB, and produces a trigger signal SC. An AND gate takes logical product of the signals SC and SD, and produces a final trigger signal SE. In response to the final trigger signal SE, a current is supplied to a squib, which then ignites and activates the vehicle rider protection apparatus. A diagnostic circuit applies a test signal to the analog signal processing circuits, and tests the operation of the circuits by analyzing the outputs of the circuits.
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