To provide a door lock control system capable of deriving a distance to a smart key with high accuracy.
In the door lock control system 10, when a request signal S1 is transmitted from an on-vehicle antenna 5 on the vehicle 11 side, a response signal S2 is returned in response from the smart key 3 carried with a user 12. When the response signal S2 is received by the on-vehicle antenna 5, door lock mechanisms 9L, 9R are unlocked. FM-CW which is continuous wave modulated in frequency is adopted to the response signal S2. Consequently, a response time can be obtained from frequency information obtained from FM-CW without directly clocking the response time. The distance to the smart key 3 can thereby be derived with high accuracy even if the distance is short.
| JP2009030337 | SMART KEYLESS ENTRY SYSTEM |
| WO/1994/023163 | SYSTEM AND METHOD FOR ACTIVATING A DEVICE |
| JPH04123651 | DOORPHONE DEVICE WITH ELECTRIC LOCK |
KATAOKA HIROYUKI
SUMITOMO WIRING SYSTEMS
SUMITOMO ELECTRIC INDUSTRIES
Yoshitake Hidetoshi
Takahiro Arita
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