DocumentCode :
847641
Title :
Keyless entry system with radio card transponder [automobiles]
Author :
Hirano, Motoki ; Takeuchi, Mikio ; Tomoda, Takahisa ; Nakano, Kin-Ichiro
Author_Institution :
Nissan Motor Co., Yokosuka, Japan
Volume :
35
Issue :
2
fYear :
1988
fDate :
5/1/1988 12:00:00 AM
Firstpage :
208
Lastpage :
216
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
Keywords :
automobiles; loop antennas; magnetic fields; magnetic flux; transceivers; transponders; Japan; Nissan; anti-theft security; automobiles; built-in personal identification code; inductive coupling; keyless entry system; loop antennas; radio card transponder; reliability; rotating magnetic field; signal transmission; twin-loop antenna; vehicle doors; Automobiles; Couplings; Magnetic fields; Mirrors; Security; Signal processing; Switches; Transmitting antennas; Transponders; Vehicles;
fLanguage :
English
Journal_Title :
Industrial Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0278-0046
Type :
jour
DOI :
10.1109/41.192651
Filename :
192651
Link To Document :
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