METHOD, SYSTEM AND PROGRAM FOR CALCULATING TIRE WEAR PERFORMANCE VALUE

To provide a method for calculating a tire wear performance value in consideration of variation of loads acting on a tire.SOLUTION: A plurality of pieces of measurement data having acceleration in two directions of a longitudinal direction and a lateral direction of a vehicle is obtained, and a plurality of travelling modes constituted of combinations of sections in the two directions is set. The plurality of pieces of measurement data is sorted into any travelling modes of the plurality of travelling modes and frequencies of the travelling modes are calculated based on the number of the measurement data sorted into the travelling modes respectively and the number of all measurement data. For the travelling modes, first friction energy is obtained from acceleration in the longitudinal direction, acceleration in the lateral direction and loads during rest. First and second load correction amounts are calculated based on the acceleration in the longitudinal and lateral directions. The first friction energy is corrected to be converted into second friction energy on the basis of the first and second load correction amounts and the loads during rest. A tire wear performance value is calculated based on the second friction energy in the travelling modes and the frequencies of the modes.SELECTED DRAWING: Figure 2 【課題】タイヤに作用する荷重変動を考慮したタイヤ摩耗性能値の算出方法を提供する。【解決手段】車両の前後方向及び左右方向の２方向の加速度を有する計測データを複数個取得し、２方向の区間の組み合わせで構成される複数の走行モードを設定し、複数個の計測データを複数の走行モードのうちのいずれかの走行モードに分類し、各々の走行モードにおいて分類された計測データの数と全ての計測データ数とに基づいて走行モードの頻度を算出し、各走行モードについて前後方向の加速度、左右方向の加速度及び静止時の荷重から第１摩擦エネルギーを取得し、前後及び左右方向の加速度に基づき第１及び第２荷重補正量を算出し、第１及び第２荷重補正量及び静止時の荷重に基づき第１摩擦エネルギーを補正して第２摩擦エネルギーに変換し、各々の走行モードの第２摩擦エネルギーおよび頻度に基づいてタイヤ摩耗性能値を算出する。【選択図】図２