| 摘要 |
System and method for selectively withholding or allowing activation of a seatbelt tensioner device, depending upon whether or not a seatbelt latch or other latchable instrument is closed. The system includes an electrical circuit including a first resistor in series with a shunt circuit, the shunt circuit including a second resistor in a first shunt to arm an electrical switch having negligible resistance in a second shunt arm. A first terminal of the circuit is connected to a first terminal of the voltage source. Second terminals of the voltage source and the circuit are connected to first and second terminals of the airbag activation circuit or seatbelt tensioner activator, which are activated only if a current passing through the activation circuit is greater than a selected threshold current. The first and second resistance values are chosen so that this current exceeds the threshold current only when the switch is closed, which occurs only when a seatbelt is latched. A high-side and a low-side switch operate to isolate the voltage source from the system.
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