Method for authorizing unlocking and/or starting of a motor...

Details Method for authorizing unlocking and/or starting of a motor... Method for authorizing unlocking and/or starting of a motor...

2005-12-20

2005-12-20

Nguyen, Hung (Department: 2636)

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

C340S426280, C340S426270, C340S426290, C340S426100, C340S870030, C340S870030, C307S010400, C307S010400

Reexamination Certificate

active

06977581

ABSTRACT:
A method for identifying and authorizing unlocking or starting of a motor vehicle for a hands-free access system includes a central unit exchanging identification messages with identification units according to a communication procedure. The communication procedure includes emitting an identification message from the central unit to the identification units, emitting a message indicating a presence of the identification units having received the identification message to the central unit, emitting a selection message by the central unit to select one particular identification unit to reply to the identification message, and emitting an additional identification message, where at least one of the emitting of a message indicating the presence of the identification units and the emitting of the selection message is performed between emitting the identification message and the emitting of the additional identification message so as to enhance the security of interchange between the central unit and the identification units.

REFERENCES:
patent: 5767784 (1998-06-01), Khamharn
patent: 5937065 (1999-08-01), Simon et al.
patent: 6144315 (2000-11-01), Flick
patent: 0923054 (1999-06-01), None
patent: 1077301 (2001-02-01), None
patent: 2781076 (2000-01-01), None
patent: 2794882 (2000-12-01), None

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