Method and device for protecting a motor vehicle

Details Method and device for protecting a motor vehicle Method and device for protecting a motor vehicle

2005-11-15

2009-06-09

Wu, Daniel (Department: 2612)

Communications: electrical

Selective

Intelligence comparison for controlling

C340S005720, C340S010200

Reexamination Certificate

active

07545254

ABSTRACT:
In a method for protecting a motor vehicle, the vehicle is equipped with antennas such that each zone of the cabin is covered by at least two antennas, and with an electronic tag furnished with a device measuring three-dimensional orientation of the magnetic fields received by the electronic tag. A sequence of emissions that consists of a succession of magnetic fields emitted in succession in a given random order from the antennas of the vehicle is randomly determined. After the tag receives this magnetic field succession, a check is carried out to verify that the random emission order has indeed been complied with and that the orientation of the fields that is received by the tag conforms to the expected random orientation. Additionally, the amplitude of the fields can be randomly varied. Authorization to start the vehicle is granted if this random variation is actually received by the tag.

REFERENCES:
patent: 6208239 (2001-03-01), Muller et al.
patent: 6218932 (2001-04-01), Stippler
patent: 2001/0028296 (2001-10-01), Masudaya
patent: 2001/0033222 (2001-10-01), Nowottnick et al.
patent: 2002/0033752 (2002-03-01), Greenwood et al.
patent: 2003/0119453 (2003-06-01), Blatz et al.
patent: 1 143 091 (2001-10-01), None
patent: 1 403 653 (2004-03-01), None

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