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.

主权项

1. A tire-pressure sensor unit comprises:
a pneumatic sensor which detects a tire pressure, a transmitter which transmits wheel information that is information including tire-pressure information representing the tire pressure detected by said pneumatic sensor and a unique sensor ID as a radio signal, and a battery prepared as an internal electrical power source, and said tire-pressure sensor unit is fixed to and disposed in a wheel and circles around an axle shaft along with the rotation of said wheel, wherein; said tire-pressure sensor unit further comprises: a turning-position detection means to detect the turning position of said tire-pressure sensor unit around the axle shaft, a transmission control means to make said transmitter transmit said wheel information at the timing when the turning position detected by said turning-position detection means arrives at a transmission setting location, a transmission location setting means to calculate a turning position which is advanced or retarded a setting adjustment angle (Δα degree) set to a value (Δα) which is not a divisor of 360, with respect to the turning position when said wheel information is transmitted last time, and to set this turning position obtained by calculating as a transmission setting location for transmitting said wheel information next time.