To provide a system capable of reducing the man-hour and the time required for acquiring tire internal information such as the tire internal pressure and the tire internal temperature, reducing the cost, and acquiring tire internal information without any radio wave interference even in a vehicle having dual rear wheels.
Sensor modules 3 (SM1-SM6) are mounted on each tire 4 of a vehicle 6, and two reception antennas 1a, 1b are mounted on tire internal information reading devices 19 so that their spacing is the distance of one half to one outer circumference of the tire. When the vehicle 6 passes at a low speed between the tire internal information reading devices 19, the tire internal information data transmitted from the sensor modules 3 (SM1-SM6) is received by the two reception antennas 1a, 1b on both sides.
SASAKI HIROAKI
KOKUBU TAKAO
Shiro Fujitani
Kiyoshi Kuruma
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