Method and apparatus for detecting air pressure in a tire using

Details Method and apparatus for detecting air pressure in a tire using Method and apparatus for detecting air pressure in a tire using

1998-12-22

2000-08-29

Oen, William

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

B60C 2302

Patent

active

061090999

ABSTRACT:
The apparatus for detecting the air pressure of the tire includes an oscillating electric signal output section for outputting an oscillating electric signal including a vibration frequency component of a tire of a vehicle. A wavelet transformation section is provided for performing wavelet transformation of the oscillating electric signal outputted by the oscillating electric signal output section. A constant extraction section is provided for calculating mean values of the wavelet coefficients calculated by the wavelet transformation section at every predetermined interval of time, for obtaining an approximate curve of the second or greater order by a method of least squares using the mean values of the wavelet coefficients at the respective predetermined frequencies at every predetermined interval of time and for extracting a constant of the approximate curve. An air pressure estimating section is provided for estimating the air pressure of the tire based on the constant.

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