Anti-carjacking device triggered by a switch in the seat belt latch

摘要: An anti-carjacking circuit for disabling a motor vehicle after the driver of has been unwillingly forced to exit vehicle. The includes: sensor sensing driver, as by detecting opening seat belt or, alternatively, together with driver's door; latching memory such relay, responsive sensor, recording from while is powered; delay comparator voltage across capacitor charged resistor, and startable thereby, indicating passage predetermined period time starting thereof; circuit, indication period, breaking ignition coil's possibly sounding an alarm. A hidden reset switch may also be included resetting in case it accidentally tripped, might happen if forgot turn engine off before removing belt.