DETECTING METHOD OF DECREASE OF TIRE AIR PRESSURE, ITS DEVICE, AND PROGRAM OF DETERMINING TIRE DECOMPRESSION

摘要

PROBLEM TO BE SOLVED: To provide a detecting method of decrease in tire air pressure capable of determining synchronous decompression of two front wheel tires and synchronous decompression of two rear wheel tires. SOLUTION: In the detecting method of the decrease in the tire air pressure, inner pressure decrease in the tires is detected based on rotation information obtained from the tires mounted to a vehicle. The detecting method comprises a process of detecting the rotation information of each tire, a process of storing the rotation information of each tire, a process of determining an adjustable speed of the vehicle, a process of determining a slip rate when the adjustable speed of the vehicle lies in a predetermined range near zero, a process of comparing the slip rate with a predetermined slip rate at a normal air pressure, and a process of determining the synchronous decompression of two front wheel tires and the synchronous decompression of two rear wheel tires based on a relation between a comparison value of two slip rates and a predetermined threshold. COPYRIGHT: (C)2003,JPO