TIRE PRESSURE DROP ALARM DEVICE AND METHOD, AND TIRE PRESSURE DROP ALARM PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a tire pressure drop alarm device, a method, and a program capable of detecting drop in the air pressure of tires, even in a four-wheel drive vehicle.;SOLUTION: A tire pressure drop detection device includes a means for determining the drop in air pressure of the tires of the four-wheel drive vehicle that includes (1) a means for calculating the gradient of the friction coefficient-slip rate curve (μ-s curve) from the wheel torque of front-wheel tires or the rear-wheel tires and wheel speed, and (2) a means for detecting the drop in air pressure, by comparing the gradient calculated by the means (1) with the gradient at normal times.;COPYRIGHT: (C)2007,JPO&INPIT