Method and device for controlling entry into a secured...

Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile

Reexamination Certificate

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Details

C307S010500, C180S287000, C340S435000

Reexamination Certificate

active

06954007

ABSTRACT:
A method is for controlling entry, e.g., into a motor vehicle, during which a key and a base station wirelessly exchange authentication data between one another in an active or a passive communication mode. At the beginning of the authentication process, the base station transmits a call signal to the key, and the key replies to the call signal with a reply signal. The base station verifies the received reply signal of the key in the communications mode in which the reply signal was received. If the reply signal of the key was received in the active communications mode, the base station transmits a first selection instruction to the key thus causing the key to perform the subsequent communication in the active communications mode. If the reply signal of the key was received in the passive communications mode, the base station transmits a second selection instruction to the key thus causing the electronic key to perform the subsequent communication in the passive communications mode.

REFERENCES:
patent: 5355513 (1994-10-01), Clarke et al.
patent: 5883443 (1999-03-01), Wilson
patent: 5983347 (1999-11-01), Brinkmeyer et al.
patent: 6323566 (2001-11-01), Meier
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patent: 198 18 158 (1999-10-01), None
patent: 0 659 963 (1995-06-01), None
patent: 0 848 123 (1998-06-01), None
patent: WO 00/05696 (2000-02-01), None

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