Patent ID: 7831346
Filing Date: 2010-11-09
Classification: B60C,Y10T

Abstract:
1. A method for detecting decompression of tires based on the rotational speeds of wheels mounted on a vehicle, comprising the steps of: detecting a rotational speed of each of said wheels; determining a speed against ground of said vehicle, wherein the speed against ground of said vehicle is determined by signals demodulated from received radio wave of GPS and time; calculating speed information of a particular wheel from the rotational speeds of said wheels; memorizing the rotational speed of each of the wheels and the speed information of said wheels; calculating a judgment value of said wheel position by comparing the speed information of said wheels with the speed against ground of the vehicle, said step of calculating including the steps of comparing the judgment value of said wheel position with a basis value of the wheel position obtained by preliminarily comparing the speed against ground of said vehicle with the speed information of said wheels at prescribed inner pressure, said step of comparing including a step of comparing said first correlation with a correlation at prescribed inner pressure; and judging decompression of tires based on relation between the comparison value of said basis value with the judgment value and a fixed threshold.