| 摘要 |
PROBLEM TO BE SOLVED: To provide a means and a method for securely and quickly determining rotation/non-rotation status of a tire equipped with a tire air pressure sensor unit. SOLUTION: The tire air pressure sensor unit is equipped with an acceleration sensor for detecting acceleration of rotation of the tire. At the time of travelling at or faster than a predetermined speed, a tire air pressure monitoring unit 5 determines the rotation/non-rotation status of the tire mounted with the tire air pressure sensor unit based on acceleration data and a sensor ID transmitted from the tire air pressure sensor unit and registers correspondence relation between the sensor ID and the rotating wheel or the ID and a spare wheel to a registered sensor ID storage part 57. When data showing reduction of the tire air pressure is detected, the tire air pressure monitoring unit 5 determines whether the tire of the air pressure reduction is a tire of the rotation wheel or a tire of the spare wheel based on information stored in the registered sensor ID storage part 57 so as to output tire air pressure reduction warning data. COPYRIGHT: (C)2006,JPO&NCIPI |
