Measuring and testing – Tire – tread or roadway – Tire inflation testing installation
Patent
1996-10-28
1998-09-01
Dombroske, George M.
Measuring and testing
Tire, tread or roadway
Tire inflation testing installation
340448, B60C 2300, B60C 2302
Patent
active
058013059
ABSTRACT:
The invention is directed to a method and apparatus for detecting a tire inflation pressure of a vehicle tire. The apparatus includes a device for producing an oscillating electric signal having a vibration frequency component of the vehicle tire. A wavelet transformer transforms the oscillating electric signal by a wavelet function into a wavelet coefficient. The wavelet function is provided on the basis of a mother wavelet function localized in time, scaled in response to a scale parameter, and shifted in response to a shift parameter indicative of a time localization. Then, an extracting device extracts a resonance frequency from the vibration frequency component of the vehicle tire on the basis of the wavelet coefficient, and an estimating device estimates the tire inflation pressure on the basis of the resonance frequency. The apparatus may further include a warning device for warning a decrease of the tire inflation pressure when the resonance frequency decreases to an extent that a difference between the resonance frequency and the reference frequency exceeds a predetermined frequency.
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Hattori Katsu
Kawai Hiroaki
Aisin Seiki Kabushiki Kaisha
Amrozowicz Paul D.
Dombroske George M.
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