CONTROL DEVICE OF AUTOMATIC TRANSMISSION

• Main Authors: KAWAI SHOGO, CHINBE TOMOHIRO, INOUE TAKASHI, TSUTSUMI TAKAHIKO, SAGAWA AYUMI, AKIRA TAKESHI
• Format: Patent
• Language: English; Japanese
• Published: 25.08.2023
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; THERMAL INSULATION IN GENERAL; WEAPONS

To improve the transmission responsiveness of a drive force, and to avoid an unintentional stop of an engine, in a situation that the viscosity of a working fluid for operating an automatic gear change becomes high, and the followability of actual pressure with respect to an indication value of hydraulic pressure is deteriorated.SOLUTION: A control device of an automatic transmission is arranged in a drive force transmission path for transmitting the power of an engine to wheels, and forms a prescribed gear change stage by changing an engagement state of a friction engagement element. The control device comprises: a traveling range standby control part for making a part of a traveling range forming element which forms a traveling range engaged before being switched to the traveling range out of the friction engagement element; and a working fluid state determination part for determining whether or not the viscosity of a working fluid for operating the friction engagement element is in a response delay state that a response delay with respect to an indication value of hydraulic pressure occurs. When the response delay state is determined, the traveling range standby control part raises an indication value of hydraulic pressure for making a brake element engaged from hydraulic pressure at which a release state of the brake element is maintained after an oil temperature of the working fluid reaches a threshold or higher.SELECTED DRAWING: Figure 5 【課題】自動変速を作動させる作動油の粘性が高くなり、油圧の指示値に対する実圧の追従性が悪化する状況において、駆動力の伝達応答性を向上させ、意図せずエンジンが停止することを回避する。【解決手段】自動変速機の制御装置は、エンジンの動力を車輪に伝達する駆動力伝達経路に配置され、摩擦係合要素の係合状態を変更することで所望の変速段を形成する。摩擦係合要素のうち、走行レンジを形成する走行レンジ形成要素の一部を走行レンジへの切り替え以前に係合させる走行レンジ待機制御部、摩擦係合要素を作動させる作動油の粘度が油圧の指示値に対する応答遅れを生じる応答遅れ状態であるか否かを判定する作動油状態判定部を備える。走行レンジ待機制御部は、応答遅れ状態であると判定されたときに、作動油の油温が閾値以上となった後にブレーキ要素を係合させる油圧の指示値をブレーキ要素の解放状態が維持される油圧から上昇させる。【選択図】図５