Keyless system for actuating a motor-vehicle door latch

Details Keyless system for actuating a motor-vehicle door latch Keyless system for actuating a motor-vehicle door latch

2006-10-24

2006-10-24

Garber, Wendy R. (Department: 2612)

Communications: electrical

Selective

Intelligence comparison for controlling

C340S005720, C340S005700, C340S005100, C340S005600, C340S005200, C340S010100, C340S005640, C307S010100, C307S010200

Reexamination Certificate

active

07126453

ABSTRACT:
A keyless actuating system has a switchable electrical device, a coded transponder adapted to be carried by a user, and a vehicle-mounted interrogating unit adapted when enabled to remotely coact with the transponder for switching the device when the transponder holds a predetermined code. A first capacitor element is carried on the vehicle, and a second capacitor element is carried on the user. A control circuit determines the capacitance between the first and second elements when the user is near the vehicle for enabling the interrogating unit only when the capacitance between the first and second elements passes a predetermined threshold. Normally the second capacitor element is actually the user.

REFERENCES:
patent: 4871204 (1989-10-01), Cook
patent: 5730165 (1998-03-01), Philipp
patent: 5880538 (1999-03-01), Schulz
patent: 6002341 (1999-12-01), Ohta
patent: 6075294 (2000-06-01), Van den Boom
patent: 6661239 (2003-12-01), Ozick
patent: 44 35 894 (1996-04-01), None
patent: 196 20 059 (1997-11-01), None
patent: 0 954 098 (1999-11-01), None

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