Tire sensor system and vehicle body having the same mounted thereon

摘要

The position of the rotation of a tire complicates the establishing of a wireless connection between a sensor unit attached to the tire and a sensor control unit attached to a vehicle body. A reflection plate (20) is attached to an inner surface of a wheel housing (16) at a position different from that of a sensor control unit (10). A transmission electromagnetic field from the sensor control unit (10) is reflected by the metal reflection plate (20) and transmitted to a sensor unit (6) rotated to a position to which the field does not readily reach directly from the sensor control unit (10). The sensor unit (6) varies an impedance of a coil antenna in accordance with transmission data, and generates a variation in the transmission electromagnetic field. The variation is detected via the reflection plate (20) as a variation in a transmission load of the sensor control unit (10), and the transmission data from the sensor unit (6) is detected in the sensor control unit (10).