| 摘要 |
A transmission cycle/output control portion (20) controls at least one of 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 at least one of the transmission output and the frequency of transmission is set to a lower value 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 a control so that the at least one of the transmission output and the frequency of transmission is 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 is reduced. When the host vehicle (100) decelerates, necessary communication is performed. |
