Patent ID: 7032442
Filing Date: 2006-04-25
Classification: B60C

Abstract:
1. A method for detecting decrease in tire air-pressure, which detects decrease in tire air-pressure on the basis of rotational information obtained from tires attached to a four-wheeled vehicle, the method comprising the steps of: detecting rotational angular velocities of respective tires; calculating an initial correction coefficient for a ratio of right and left wheels from among the rotational angular velocities of respective tires; terminating initialization of a first stage at a point of time when the initial correction coefficient has been calculated for performing a provisional judgment of decompression; calculating an initial correction coefficient for a ratio of front and rear wheels from among the rotational angular velocities of respective tires; and terminating initialization of a second stage at a point of time when the initial correction coefficient has been calculated for performing normal judgment of decompression.