| 摘要 |
PROBLEM TO BE SOLVED: To provide a vehicle communication system and method in which necessary communication can be performed and communication traffic can be reduced even when a vehicle decelerates. SOLUTION: A transmission cycle/output control portion 20 controls a transmission output of an inter-vehicle communication device 22 and a frequency of transmission from the inter-vehicle communication device 22 according to the speed of a host vehicle 100 detected by an in-vehicle sensor 12 so that the transmission output and the frequency of transmission can be set to lower values as the speed becomes lower. In the case where the in-vehicle sensor 12 and a deceleration determination/gradient calculation portion 16 determine that the host vehicle 100 decelerates, the transmission cycle/output control portion 20 executes control so that the transmission output and the frequency of transmission can be high as compared to the case where it is determined that the host vehicle 100 does not decelerate. Therefore, when the host vehicle 100 does not decelerate, communication traffic can be reduced. When the host vehicle 100 decelerates, necessary communication can be performed. COPYRIGHT: (C)2009,JPO&INPIT
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