| 摘要 |
PROBLEM TO BE SOLVED: To provide a tire air pressure monitoring device capable of receiving certainly the data transmitted from a transmitter unit using a receiver unit and capable of saving the power consumed by the transmitter unit. SOLUTION: The tire air pressure monitoring device is equipped with the transmitter unit 5 (transmitting means) having an air pressure sensor 51 (air pressure sensing part), a normal packet transmission data memory 54 and a low-consumption packet transmission data memory 55 (packet preparing part), and a transmitter 56 (transmission part) and attached to each tire, a receiver 61 (receiving means), a judgement part 63 (air pressure judging means) to judge that the tire air pressure has sunk below the set value, an indication part 64 (notifying means) to notify the driver of a drop of the tire air pressure, and a centrifugal switch 50 (stopped condition sensing means) to sense the vehicle running or being stopped, wherein the transmitter 56 transmits the normal packet while the vehicle is running and does the low-consumption packet having a smaller data amount than the normal packet while the vehicle is stopped. COPYRIGHT: (C)2008,JPO&INPIT
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