Patent ID: 6644108
Filing Date: 2003-11-11
Classification: B60C

Abstract:
An apparatus for estimating a pneumatic tire pressure comprising:tire vibrational information detecting means for detecting vibrational information of a tire; filtering means for filtering desired frequency information based on the vibrational information detected by said tire vibrational information detecting means; resonance frequency detecting means for detecting a resonance frequency based on the frequency information filtered by said filtering means; and pneumatic tire pressure estimating means for estimating a pneumatic tire pressure based on said resonance frequency, wherein said filtering means is constituted by a plurality of filters having filtering effects different from each other, and said resonance frequency detecting means comprises means for obtaining frequencies corresponding to the resonance frequency based on respective frequency information passing through said plurality of filters, and determining means for determining an optimum frequency having less influence of noise based on the obtained frequencies, thereby obtaining said resonance frequency based on the optimum frequency determined by said determining means.