| 摘要 |
PROBLEM TO BE SOLVED: To improve accuracy in detecting lowering of tire inflation pressure by using the maximum of effective determination values, by preventing deterioration in accuracy for data selection, when a vehicle travels a circumferential circuit. SOLUTION: The tire inflation pressure alarm device determines whether the vehicle travels the circumferential circuit or not. When it is determined that the vehicle travels the circumferential circuit, in a section wherein an absolute value of a difference is not less than a required value after the determination, a wheel speed right and left ratio center value RpL_cent(t-1) at a starting time of the section is derived as a wheel speed right and left ratio center value RpL_cent(t) (steps 110 to 114, and 118 or steps 110, 120 to 124, and 118). COPYRIGHT: (C)2005,JPO&NCIPI
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