| 摘要 |
PROBLEM TO BE SOLVED: To provide a tire air pressure monitoring system capable of determining the mounting position of the tire in a short determination time while keeping correctness of the determination. SOLUTION: The radio wave intensity average value of reception of a first predetermined reception number of times N<SB>1</SB>is obtained for each tire sensor when the first predetermined reception number of times is N<SB>1</SB>. If the absolute value of the difference of the average value in each tire sensor is not less than a first determination value D<SB>1</SB>, the determination of front or rear wheel is performed from the result. When it is less than the first determination value D<SB>1</SB>, the radio wave intensity average value of reception of a second predetermined reception number of times N<SB>2</SB>is obtained for each tire sensor when the second predetermined reception number of times N<SB>2</SB>is larger than the first predetermined reception number of times N<SB>1</SB>. If the absolute value of the difference of the average value in each tire sensor is not less than the second predetermined determination value D<SB>2</SB>smaller than the first determination value D<SB>1</SB>, the determination of front or rear wheel is performed from the result. The state of each tire is monitored by the state signal for the determined tire. COPYRIGHT: (C)2007,JPO&INPIT
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