| 摘要 |
A method of detecting a decrease in a tire air pressure based on wheel rotation information obtained from tires attached to a four-wheel vehicle. The method includes: a step of calculating wheel rotation information obtained from the respective wheel tires; a step of computing the first to the third judgment values DEL1, DEL2, and DEL3; a step of storing the wheel rotation information, the first judgment value, the second judgment value, and the third judgment value; a step of setting judgment conditions for the first judgment value, the second judgment value, and the third judgment value with regard to the respective wheel tires; and a step of judging, based on the judgment conditions, a decrease in the air pressures of the respective wheel tires. The step of setting the judgment condition sets threshold values used for the judgment conditions depending on a status of a road on which a vehicle runs, a turning level of the vehicle, or a level of the running of the vehicle running on an uphill or a downhill.
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