Patent ID: 6802213
Filing Date: 2004-10-12
Classification: B60C

Abstract:
A method for indicating a pressure loss condition in tires of a vehicle, each tire having a speed related to vehicle speed and to vehicle operating condition, the method comprising:storing a predetermined number of tire speed patterns, each tire speed pattern representing relative tire speed conditions corresponding to a respective normal vehicle operating condition which results in tire speed variations; storing a predetermined tire pressure for the tires; sensing the speed of each of the tires; sensing the pressure of a single tire of the tires; determining an actual tire speed pattern from the sensed speeds of the tires representing an actual relative tire speed condition; and determining if the actual tire speed pattern corresponds to any one of the stored tire speed patterns, and (A) if not, determining whether there is a pressure loss condition in the tires in accord with the actual tire speed pattern and the sensed tire pressure, and (B) if so, bypassing the step of determining whether there is a pressure loss condition.