| 摘要 |
PROBLEM TO BE SOLVED: To provide a lowered tire-air pressure alarming method capable of reducing the number of times of calculation to obtain a primary regression line of a slip ratio and acceleration and accurately detecting the lowering of the inner pressure of a tire even if a road state is irregular. SOLUTION: The lowered tire-air pressure alarming method includes: a step for detecting rotation information obtained from tires mounted to a vehicle; a step for calculating a wheel speed, vehicle acceleration, and a slip ratio of front and rear wheels from the respective tire rotation information; a step for accumulating the vehicle acceleration and the slip ratio of the front and the rear wheels; a step for obtaining a mutual primary regression coefficient between the vehicle acceleration and the slip ratio of the front and the rear wheels; and a step for determining whether tire pressure is reduced by comparing the primary regression coefficient to the primary regression coefficient calculated in advance in a preceding step when the tire pressure is within a normal range. COPYRIGHT: (C)2008,JPO&INPIT
|
