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

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

1993-02-05

1995-08-01

Groody, James J.

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

340430, 180287, B60R 2500

Patent

active

054383110

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

REFERENCES:
patent: 3656100 (1972-04-01), Beltrami
patent: 3735346 (1973-05-01), Fox
patent: 3781789 (1973-12-01), Caleskie et al.
patent: 3781854 (1973-12-01), Kaufman et al.
patent: 4133410 (1979-01-01), Krusoe
patent: 4712477 (1987-12-01), Aikou et al.
patent: 4745897 (1988-05-01), Tejeda
patent: 5319351 (1994-06-01), Beezley, Jr.
patent: 5335748 (1994-08-01), Wilson

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