Keyless entry system with radio card transponder [automobiles]
Hirano, M.
Takeuchi, M.
Tomoda, T.
Nakano, K.-I.
Nissan Motor Co., Yokosuka;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: May 1988
Volume: 35,
Issue: 2
On page(s): 208-216
ISSN: 0278-0046
References Cited: 1
CODEN: ITIED6
INSPEC Accession Number: 3188550
Digital Object Identifier: 10.1109/41.192651
Current Version Published: 2002-08-06
Abstract
A keyless entry system for locking and unlocking vehicle doors,
and for opening the trunk is described. This system utilizes a small
(ordinary credit-card size) card transponder with a built-in personal
identification code that can be carried in a pocket or a briefcase and
the user does not have to take it out for use because the signal
transmission is effected by inductive coupling between the card and loop
antennas built into the door mirror housing and rear bumper. By touching
a switch provided near the trunk keyhole, the user can open the door or
trunk as if there were no locks. For anti-theft security and
reliability, the system incorporates a twin-loop antenna that generates
a rotating magnetic field, and a detection system to prevent the card
transponder from being left inside the vehicle. This system has been
installed in the luxury classes of Nissan models in the Japanese market
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