| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a vehicular alarm control system capable of preventing any unnecessary alarm operation in a portable machine and an on-vehicle machine. <P>SOLUTION: In the vehicular alarm control system, an on-vehicle machine 20 is connected to a security device 30 for monitoring the state of each part of a vehicle, and waits for a signal for abnormality detection. The on-vehicle machine 20 transmits the initial command and the alarm factors as state information. The portable machine 10 transmits alarm information included in the alarm factors to an alarm 17 unconditionally if the reception is the initial command, and transmits the response signal. The on-vehicle machine 20 ends the transmission to the portable machine 10 when the response signal is received within a predetermined time from the previous transmission. A transmission control unit 24 of the on-vehicle machine 20 is operated so as to transmit the alarm signal at a predetermined interval before receiving the response signal, and controls the predetermined interval so as to be changed in the elapse of time after the alarm signal is generated. A transmission control unit 24 determines the number of re-transmission based on the output of the abnormality detection unit, and gives the code indicating that the alarm signal is the initial transmission or the code in a re-transmission state. <P>COPYRIGHT: (C)2008,JPO&INPIT |
