Patent ID: 6774776
Filing Date: 2004-08-10
Classification: B60C

Abstract:
A method for alarming a decrease in tire air-pressure, in which rotational numbers of four tires are detected for judging, on the basis of the detected rotational numbers, whether any of the tire air-pressures is decreased or not, and issuing an alarm if the internal pressure of a tire is decreased, said method comprising the steps of:calculating a judged value for detecting deflation of a tire by comparing differences between two diagonal sums of rotational numbers of front tires and rear tires; subtracting correction factor function values from actually measured values when performing actual running of the vehicle with the tires being set to specific air-pressures, said correction factor function values including a first factor related to lateral acceleration of the vehicle and a second factor related to lateral acceleration and front and rear wheel ratios, the first and second factors being calculated such that a result of the subtraction is approximately close to zero; and storing the first and second factors.