| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a tire air pressure detector capable of surely giving an alarm about a decrease in tire air pressure on the basis of an alarm threshold following a change in the air pressure in a tire, which is caused by traveling of a vehicle. <P>SOLUTION: The alarm threshold (first alarm threshold) obtained by lowering pressure by an alarm detection decompression rate from reception pressure determined in the past is set, and the decrease of the tire air pressure is determined when the reception pressure reaches the alarm threshold or below (step 205). Additionally, a lower limit value (second alarm threshold) of the alarm threshold set on the basis of vehicle recommended pressure is set, and the decrease of the tire air pressure is determined even when the reception pressure reaches the lower limit value of the alarm threshold or below (step 210). Thus, the alarm about the decrease of the tire air pressure can be surely given on the basis of the alarm threshold following the change of the air pressure in the tire, which is caused by the traveling of the vehicle. <P>COPYRIGHT: (C)2012,JPO&INPIT |
