Patent ID: 6789038
Filing Date: 2004-09-07
Classification: B60C

Abstract:
An apparatus for estimating a tire condition amount of that vehicle wheel provided in a vehicle equipped with a plurality of vehicle wheels, each formed with air enclosed under pressure in an inside portion of a tire mounted to a disc wheel, comprising:a plurality of wheel speed sensors that detect a vehicle wheel speed of each vehicle wheel, each sensor being provided in relation to each of the plurality of vehicle wheels; an estimating unit that obtains a reflected value reflecting a tire condition amount of each of the plurality of vehicle wheels based upon the vehicle wheel speed detected by each of the plurality of wheel speed sensors, and estimates the tire condition amount of each of the plurality of vehicle wheels based upon the obtained reflected value, wherein the estimating unit estimates a reflected value of a first vehicle wheel for which it is relatively difficult to accurately obtain the reflected value based upon the vehicle wheel speed of the first vehicle wheel among the plurality of vehicle wheels, during a first period corresponding to a second period for obtaining the reflected value of the first vehicle wheel, based upon a reflected value obtained for a second vehicle wheel, for which it is relatively easy to accurately obtain the reflected value of the second vehicle wheel based upon a vehicle wheel speed of the second vehicle wheel, in order to obtain the reflected value of the first vehicle wheel.