| 摘要 |
PROBLEM TO BE SOLVED: To provide a tire pressure drop warning method capable of detecting coaxial two-wheel pressure reduction including a driven axis and four-wheel simultaneous pressure reduction or tire wear only by wheel speed information. SOLUTION: This tire pressure drop warning method comprises a process of detecting rotation information of each tire, a process of calculating and storing a wheel speed, vehicular acceleration, a slip ratio of front and rear wheels, a travel distance and a turning radius respectively based on the rotation information of each tire, a process of determining the moving average of the vehicular acceleration and the slip ratio of the front and rear wheels, a process of accumulating the travel distance, and the averaged vehicular acceleration and the slip ratio, a process of obtaining a mutual primary regression coefficient and correlation coefficient between the vehicular acceleration and the slip ratio, a process of obtaining the slip ratio of the front and rear wheels when the vehicular acceleration is zero, a process of determining whether at least coaxial two wheels or four wheels are decompressed simultaneously or not based on the slip ratio of the front and rear wheels when the primary regression coefficient and the vehicular acceleration are zero, and a process of issuing an alarm of the air pressure drop of the tire. COPYRIGHT: (C)2005,JPO&NCIPI
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