| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve the problem of having large fear of deadening a battery due to an increase in electric power consumption by simultaneously operating a keyless entry system and a security device. <P>SOLUTION: A transmission wave of a radar radio wave (a periphery monitoring sensor 105) for monitoring the vehicle periphery, is modulated to a pulse by an identification code of a keyless entry unit 103, and this radio wave is used as a calling radio wave of the keyless entry unit 103. A transmission interval of the radar radio wave for monitoring the periphery, and a transmission interval of the calling radio wave of the keyless entry system, are controlling based on a distance to an object approaching a vehicle detected by this radar radio wave. Electric power consumption of the periphery monitoring sensor 105 and the keyless entry system, is reduced by lengthening the transmission interval when the distance is large. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
