METHOD FOR DETERMINING SLIP STATE OF TIRE

• Main Author: YAGASAKI TORU
• Format: Patent
• Language: English; Japanese
• Published: 26.07.2023
• Subjects: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE ORDIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; PERFORMING OPERATIONS; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TOTHE CONTROL OF A PARTICULAR SUB-UNIT; TRANSPORTING; VEHICLES IN GENERAL

To reduce the influence of a vertical load and a tire air pressure in a method for determining the slip state of a tire.SOLUTION: A method for determining the slip state of a tire includes: detecting the rotational fluctuation of a power transmission member and the rotational fluctuation of a wheel; on the basis of the amplitude ratio of the rotational fluctuation amplitude of the wheel to the rotational fluctuation amplitude of the power transmission member, and a phase delay in the rotational fluctuation of the wheel relative to the rotational fluctuation of the power transmission member, determining whether the vibration mode of the wheel and tire is an elastic slip mode which shows a frequency response in an elastic slip state, or a sliding slip mode which shows a frequency response in a sliding slip state; and determining that the tire is in the sliding slip state when the vibration mode of the wheel and tire is the sliding slip mode. The amplitude ratio and the phase delay are calculated by applying, to a tire driving radius, an effective rolling radius in a region where a relationship between a dynamic load radius and the effective rolling radius is linear.SELECTED DRAWING: Figure 4 【課題】 タイヤの滑り状態判定方法において、垂直荷重及びタイヤ空気圧の影響を受け難くする。【解決手段】 タイヤの滑り状態判定方法は、動力伝達部材の回転変動及び車輪のホイールの回転変動を検出し、動力伝達部材の回転変動振幅に対するホイールの回転変動振幅の振幅比と、動力伝達部材の回転変動に対するホイールの回転変動の位相遅れとに基づいて、ホイール及びタイヤの振動モードが、弾性滑り状態の周波数応答を表す弾性滑りモードか移動滑り状態の周波数応答を表す移動滑りモードかを判定し、ホイール及びタイヤの振動モードが移動滑りモードである場合に、タイヤが移動滑り状態であると判定する。振幅比と位相遅れとは、タイヤ駆動半径に動的負荷半径と有効転がり半径との関係が線形になる領域の有効転がり半径を適用して算出する。【選択図】 図４