Security system

Details Security system Security system

2005-08-30

2005-08-30

Holloway, III, Edwin C. (Department: 2635)

Communications: electrical

Selective

Intelligence comparison for controlling

Reexamination Certificate

active

06937136

ABSTRACT:
A security system is disclosed which is suitable for use in a passive entry and passive starting arrangement for a vehicle10.A set of transmitters in the form of coils A, B, C are spaced around the vehicle10,one A, B in each door mirror20R,20L and one in a high level brake light16at the rear end.Operation of a door handle initiates an access challenge from the vehicle10which is sent out successively on a plurality of the coils A, B, C. A portable transponder26carried by an authorised user is adapted to pick up the challenge signal and send back to a security controller18a response signal in which is included vector information relating to the relative positioning between the vehicle10and the transponder26.

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