Electronic key for a motor vehicle

Details Electronic key for a motor vehicle Electronic key for a motor vehicle

1977-08-16

1979-06-26

Waring, Alvin H.

Communications: electrical

Selective

Having indication or alarm

340 53, 345539, 343228, 325 64, 180114, B60R 2504

Patent

active

041594673

ABSTRACT:
An electronic key for a motor vehicle includes a hand held portable transmitter carried by the authorized driver of the vehicle and a receiver and associated detection circuitry maintained in the vehicle. The receiver is programmed to respond to periodic identification signals from the transmitter by applying periodic control pulses to the associated detection circuitry. The detection circuitry enables the vehicle in response to the presence of at least one control pulse during each periodic interval and disables the vehicle in response to the absence of a control pulse during any one of the periodic intervals. The electronic key provides individual vehicle control in the same manner as does standard mechanical keys while being highly resistant to tampering or duplication by unauthorized vehicle users.

REFERENCES:
patent: 3396811 (1968-08-01), Bowers et al.
patent: 4023138 (1977-05-01), Ballin

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