TIRE AIR PRESSURE TRANSMISSION DEVICE AND TIRE AIR PRESSURE MONITORING SYSTEM

摘要

Provided is a tire air pressure transmission device configured to determine the rotational position of the tire air pressure transmission device based on a gravitational acceleration component of a centrifugal acceleration at the time of transmission of the tire air pressure information and to transmit in a wireless signal and at a prescribed cycle, tire air pressure information and tire air pressure transmission device rotational position information.

主权项

1. A tire air pressure monitoring system for monitoring an air pressure of each tire, comprising:
a tire air pressure detection mechanism installed on each wheel that detects the tire air pressure; an acceleration detection mechanism installed on each wheel that detects a centrifugal acceleration while the wheel rotates; a position determination mechanism that detects a position in a single period of a gravitational acceleration component of the centrifugal acceleration subject to a periodical change along with a rotation of the wheel; a transmitter installed on each wheel that transmits the detected tire air pressure, the position of the gravitational acceleration component at the time of the transmission of a wireless signal, and identification information unique to each transmitter as the wireless signal; a receiver installed on a vehicle body to receive the wireless signal; a rotational position detection mechanism installed on the vehicle body in correspondence with each wheel to detect the rotational position of the wheel; and a wheel position determination mechanism that corrects the rotational position of each wheel at the time of transmission of the wireless signal including specific identification information by a correction value set in accordance with the positional information of the gravitational acceleration component superposed on the wireless signal containing the identification information to determine the wheel position of the wheel on which the transmitter is installed based on the corrected rotational position of each wheel.