| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform warning by more appropriate timing, in a receiver of a tire air pressure monitoring system. <P>SOLUTION: A reference point K1 is set based on the temperature and the air pressure of a tire included in the signal when receiving an information signal. Specifically, the reference point K1 is set to an intersection A1 of the value that decreases only a constant percentage (20%) from the air pressure of the tire included in the information signal with a temperature of the tire included in the same signal. Then a threshold straight line L1 that passes this reference point K1 and has the inclination according to the Boyle Charles' law derived from the temperature of the tire and the air pressure of the tire included in the information signal is set. The correction low air pressure threshold Th2 is set on the threshold straight line L1 according to the temperature of the tire included in the information signal received afterwards. Therefore, when the air pressure in the tires decreases more than a constant percentage, the warning can be performed, even if there is a temperature change in the tire. <P>COPYRIGHT: (C)2013,JPO&INPIT |
