| 摘要 |
PROBLEM TO BE SOLVED: To provide an alarm device for air pressure in a tyre, which alarm device can precisely specify the position of a low-pressure wheel within the wide speed range of a vehicle by changing the judgement threshold value for specifying the position of the low-pressure tyre with the speed of the vehicle. SOLUTION: In a device for judging the air pressure drop in the tyre by achieving a judgement value for judging the air pressure drop in the tyre from the information of the rotational speed of the wheel of the vehicle and by comparing the judgement value with the threshold value, the judgement threshold value for specifying the position of the low pressure tyre is changed with the speed of the vehicle. Further, the judgement value for judging the position of the low-pressure tyre is the ratio of the rotational speeds of the right and left wheels on the same axle. COPYRIGHT: (C)2006,JPO&NCIPI
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