TIRE-PRESSURE SENSOR UNIT AND A TIRE-PRESSURE INFORMATION DEVICE

摘要

A tire-pressure information device should receive wheel information within a demanded detection time. A transmission controller of a sensor unit transmits wheel information as a radio signal at the timing when the turning position θ of the sensor unit detected by an acceleration sensor arrives at the transmission setting location α after 1 minute has passed since the last transmission of the wheel information. This transmission setting location α is set to a turning position which is advanced or retarded a setting adjustment angle Δα (for instance, 146 degree) set to a value which is not a divisor of 360, with respect to the turning position θ when the last wheel information is transmitted last time.