Test circuit for automotive passenger restraint systems
First Claim
1. A test circuit for automotive passenger safety systems, said safety system including a trigger signal discriminator and a power output stage actuated by said discriminator, said power output stage serving to actuate said safety system, and wherein, according to the invention, said test circuit comprises a semiconductor switch (16) which may be placed in electrical series connection with said power output stage (14) and said safety system (11), said test circuit including means for preventing simultaneous conduction of said switch (16) and said power output stage (14) during a test.
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Abstract
In order to provide for complete testing of all the components of a trigger circuit for actuating an automotive passenger restraint system, and thereby to prevent unintentional deployment of restraint systems, for example air bags, the test circuit performs a testing program which is initiated at the moment when electric power is applied to the passenger safety system. The testing program checks the operation of the electronic discriminator circuits as well as the correct operation of the power output circuit by generating a simulated triggering signal. The actuation of the passenger restraint system is prevented during the test cycle by blocking an auxiliary semiconductor switch connected in series with the power output transistor of the triggering circuit.
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Citations
10 Claims
- 1. A test circuit for automotive passenger safety systems, said safety system including a trigger signal discriminator and a power output stage actuated by said discriminator, said power output stage serving to actuate said safety system, and wherein, according to the invention, said test circuit comprises a semiconductor switch (16) which may be placed in electrical series connection with said power output stage (14) and said safety system (11), said test circuit including means for preventing simultaneous conduction of said switch (16) and said power output stage (14) during a test.
Specification