| 摘要 |
PROBLEM TO BE SOLVED: To provide a pressure reduction sensitivity device capable of setting a warning threshold value in an optimal position of its tire by estimating pressure reduction sensitivity in initialization. SOLUTION: This pressure reduction sensitivity estimating device is used for a tire air pressure reduction detecting device including a detecting means for detecting rotating speed information on a tire installed in respective wheels of a vehicle, an estimating means for estimating a resonance frequency of the tire from the rotating speed information provided by this detecting means and a determining means for determining reduction in tire air pressure based on the estimated resonance frequency, and estimates the pressure reduction sensitivity of the resonance frequency of the tire, and includes an arithmetic operation means for calculating a pointed degree of expressing a rising degree of the resonance peak from a parameter of an estimated transfer function and the resonance frequency when estimating the resonance frequency in the initialization, a storage means for storing a predetermined relational expression of indicating the relationship between the pointed degree and the pressure reduction sensitivity and a pressure reduction sensitivity calculating means for determining the pressure reduction sensitivity of the tire from the pointed degree calculated by the arithmetic operation means and the predetermined relational expression. COPYRIGHT: (C)2011,JPO&INPIT |
