Patent ID: 7327243

Claim:
A method for warning deflation of tires by detecting deflation of tires based on rotational information obtained from tires mounted on a vehicle, comprising the steps of: detecting the rotational information of each of said tires; calculating and storing wheel speeds, vehicle accelerations, slip ratios of front and rear wheels, traveling distances and radii of travel paths of said vehicle from the rotational information of respective tires; calculating moving average of said vehicle accelerations and slip ratios of front and rear wheels; accumulating the traveling distances and storing said moving averages of acceleration and the slip ratios of front and rear wheels when a radius of a travel path of said vehicle is a fixed value or more; determining regression coefficient and correlation coefficient of said slip ratio of front and rear wheels on vehicle acceleration where said accumulated traveling distance is a fixed distance or more; determining slip ratios of front and rear wheels while said vehicle accelerations are zero; determining whether the pressures of at least 2 wheels on the same axle or 4 wheels we simultaneously reduced or not, based on said regression coefficient when said correlation coefficients are a fixed value or more and the slip ratios of front and rear wheels while the vehicle accelerations are zero; and warning deflation of tires based on the result of said deflation judgment.