Title:
ON-VEHICLE EQUIPMENT REMOTE CONTROL SYSTEM
Document Type and Number:
Japanese Patent JP3876712
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To secure a stable communication area before start of a vehicle power source in communication between an on-vehicle machine and a portable machine and to suppress occurrence of a communication error caused by the driving after the start of the vehicle power source, in relation to an on-vehicle equipment remote control system.
SOLUTION: The on-vehicle equipment remote control system has the on- vehicle machine 20 capable of transmitting request signals having different frequency and the portable machine 22 capable of receiving the request signals having different frequency transmitted from the on-vehicle machine 20. In performing engine start control before the engine start, down link communication from the on-vehicle machine 20 to the portable machine 22 is performed using radio wave having low frequency of 134 kHz. In recognizing whether the portable machine 22 lies in a car or not after the engine start, the down link communication from the on-vehicle machine 20 to the portable machine 22 is performed using radio wave having high frequency of 300 kHz.
Inventors:
Hiroki Okada
Application Number:
JP2001394562A
Publication Date:
February 07, 2007
Filing Date:
December 26, 2001
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
E05B49/00; B60R25/01; B60R25/04; B60R25/104; B60R25/20; B60R25/24; H04Q9/00; H04Q9/10; (IPC1-7): B60R25/04; B60R25/00; B60R25/10; E05B49/00; H04Q9/00; H04Q9/10
Domestic Patent References:
| JP2001227218A | ||||
| JP2001295524A |
Attorney, Agent or Firm:
Tadahiko Ito
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