| 摘要 |
A method for detecting lowering of pneumatic pressure of a tire and a system thereof, and a recording medium read by a computer with a tire decompression decision program are provided to lengthen the life span of a nonvolatile memory by decreasing the recording frequency of data and minimizing the structure of the nonvolatile memory. A pneumatic pressure detection system measures lowering of pneumatic pressure of four tires(FL,FR,RL,RR), and includes a rotational speed sensor(1) installed in the tire. The rotational speed sensor measures the vehicle speed by generating wheel rotation pulse, or rotational angular speed by generating electric force in rotating the tire. The rotational speed sensor outputs a signal to a control unit(2), and the control unit is connected with a display unit(3), an initialization switch(4) and an alarm(5). The display unit has a liquid crystal display element, a plasma display element or a cathode ray tube for indicating the tire having low pneumatic pressure.
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