Patent ID: 6917864
Filing Date: 2005-07-12
Classification: B60C

Abstract:
1. A method for detecting decrease in tire air-pressure in which decrease in internal pressure of a tire is detected on the basis of rotational information obtained from tires attached to a vehicle, comprising the steps of: detecting rotational information of the respective tires; storing the rotational information of the respective tires; obtaining a slip rate between the tires and a road surface during running; comparing the slip rate with a slip rate which has been preliminarily obtained when at normal internal pressure; and judging simultaneous decompression of two wheel tires of both front wheels or simultaneous decompression of two wheel tires of both rear wheels on the basis of a relationship between a value obtained through comparison of the two slip rates and a specified threshold, and wherein said step of judging simultaneous decompression is performed on the basis of only a relationship between a value obtained through comparison of the two slip rates and a specified threshold.