CONTROLLER OF AUTOMATIC TRANSMISSION FOR VEHICLE

To enable a command pressure of a lock-up clutch to be set to a more appropriate value that takes into account an internal pressure of a torque converter, and enable slip control of the lock-up clutch to be performed with higher accuracy.SOLUTION: When power is not transmitted from an input shaft (1...

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Bibliographic Details
Main Authors EGASHIRA FUMIO, YAMAZAKI RYOTA, NAKAJIMA SEIKA
Format Patent
LanguageEnglish
Japanese
Published 11.04.2024
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Summary:To enable a command pressure of a lock-up clutch to be set to a more appropriate value that takes into account an internal pressure of a torque converter, and enable slip control of the lock-up clutch to be performed with higher accuracy.SOLUTION: When power is not transmitted from an input shaft (10) of a transmission mechanism (2a) to the wheel or transmission gear of a vehicle (so-called off-gear state), a command pressure of hydraulic oil supplied to a lock-up clutch (40) is increased, and when a slip rate of a torque converter (3) exceeds a predetermined value, torque converter internal pressure learning control is performed to learn an internal pressure of the torque converter (3) based on the command pressure of the hydraulic oil supplied to the lockup clutch (40) at that time.SELECTED DRAWING: Figure 6 【課題】ロックアップクラッチの指令圧をトルクコンバータの内圧を加味したより適切な値に設定することができ、ロックアップクラッチのスリップ制御をより高精度に行うことを可能とする。【解決手段】変速機構(2a)の入力軸(10)から車両の車輪軸又は変速ギヤへの動力の伝達が行われない状態(いわゆるオフギヤ状態)のときに、ロックアップクラッチ(40)に供給する作動油の指令圧を上昇させて、トルクコンバータ(3)のスリップ率が所定以上となったら、その際のロックアップクラッチ(40)に供給する作動油の指令圧に基づいて、トルクコンバータ(3)の内圧を学習するトルクコンバータ内圧学習制御を行う。【選択図】図6
Bibliography:Application Number: JP20220159128