Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile
Patent
1995-03-17
1998-03-03
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Vehicle mounted systems
Automobile
307 103, 307 104, 307 105, 180287, 34082572, 34082569, 34082554, 340426, 364424045, B60Q 100
Patent
active
057239118
ABSTRACT:
A device for controlling keyless access to a motor vehicle includes a transceiver to be carried by a user. A distance detecting device measures a distance between the transceiver and a motor vehicle. A transmitting unit being disposed in the motor vehicle and being associated with a tripping device broadcasts a question code signal when the tripping device is actuated. The transceiver has a receiver for receiving the question code signal, and the transceiver has a transmitter for broadcasting an answer code signal only whenever the motor vehicle is located in the immediate vicinity of the transceiver. A receiving unit disposed in the motor vehicle receives the answer code signal from the transceiver and furnishes an unlocking signal to an unlocking unit if the answer code signal matches a set-point code signal.
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Ganjian Peter
Greenberg Laurence A.
Lerner Herbert L.
Shoop Jr. William M.
Siemens Aktiengesellschaft
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