System, method, and program for detecting deflated tires

摘要

A system for detecting deflated tires by making a relative comparison among rotation speeds of tires attached to a vehicle. The system includes a rotation speed information detection means for detecting rotation speed information of the tires; a rotation speed calculation means for calculating rotation speeds of the tires; and a determination means for determining deflated tires by comparing a decreased pressure determination value using the calculated rotation speeds with a predetermined threshold value. The determination means determines that the vehicle is going straight when it is found, with regard to factors composed of a lateral G, a yaw rate, and a steering angle of the vehicle, at least two of the factors including the yaw rate show that a difference between the maximum value and the minimum value at a predetermined time is lower than a predetermined value, thereby detecting deflated tires.

主权项

1. A system for detecting deflated tires by making a relative comparison among rotation speeds of tires attached to a vehicle, comprising:
a first sensing device configured to detect rotation speed information of the tires;a CPU configured to:
calculate, based on the rotation speed information obtained from the rotation speed information detection, rotation speeds of the tires; and determine deflated tires by comparing a decreased pressure determination value using the calculated rotation speeds with a predetermined threshold value; a second sensing device configured to continuously measure factors composed of a lateral G, a yaw rate, and a steering angle of the vehicle during a predetermined time period, the predetermined time period including a plurality of predetermined unit time periods, wherein for each factor, a plurality of values, including a maximum value and a minimum value, are obtained, and each of the plurality of values is an average value of measured values measured during each of the plurality of predetermined unit time periods, wherein the CPU determines that the vehicle is going straight when it is found, with regard to factors composed of the lateral G, the yaw rate, and the steering angle of the vehicle, at least two of the factors including the yaw rate show that a difference between the maximum value and the minimum value over the predetermined time period for respective factor is lower than a predetermined value, thereby determining deflated tires.