To provide a vehicle radio communication system that can accurately receive by vehicle side communication equipment, electric waves transmitted from tire side communication equipment included in each wheel even without including a radio device in each of a plurality of wheels.SOLUTION: A first antenna 31a, a second antenna 31b and a second matching circuit 32b are provided in vehicle side communication equipment 3. A circuit constant of the second matching circuit 32b is variable so as to make a phase of electric waves to be received variable in the second matching circuit 32b. With this, a phase difference of propagation paths can be changed, and a null point moves or a propagation level of electric waves at the null point can be changed so as to strengthen synthetic waves of a plurality of propagation paths in electric wave propagation between the vehicle side communication equipment 3, and tire side communication equipment 2a-2d. With this, it is possible to accurately receive frame transmitted from all of the tire side communication equipment 2a-2d, i.e., electric waves.SELECTED DRAWING: Figure 3
【課題】複数の車輪それぞれに無線機を備えなくても、各車輪に備えたタイヤ側通信機から送信された電波を車両側通信機で的確に受信できる車両無線通信システムを提供する。【解決手段】車両側通信機3に第1アンテナ31aおよび第2アンテナ31bと第2整合回路32bを備える。そして、第2整合回路32bの回路定数を可変とし、受信する電波の位相を第2整合回路32bにて可変させられるようにする。これにより、車両側通信機3とタイヤ側通信機2a~2dとの間の電波伝搬における複数の伝搬パスの合成波が強め合うように、伝搬パスの位相差を変化させられ、ヌル点が移動またはヌル点での電波の伝搬レベルを変化させられる。よって、すべてのタイヤ側通信機2a~2dから送信されたフレーム、つまり電波の受信を的確に行うことが可能となる。【選択図】図3
VEHICLE RADIO COMMUNICATION SYSTEM
車両無線通信システム
2024-11-28
Patent
Electronic Resource
Japanese
IPC: | B60C VEHICLE TYRES , Fahrzeugreifen |
European Patent Office | 2021
|VEHICLE RADIO COMMUNICATION DEVICE AND RADIO COMMUNICATION SYSTEM
European Patent Office | 2017
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