HYDRAULIC PRESSURE CONTROL DEVICE OF AUTOMATIC TRANSMISSION AND HYDRAULIC PRESSURE CONTROL METHOD

• Main Authors: KAMATA SHINYA, SAJI TSUNESHIRO
• Format: Patent
• Language: English; Japanese
• Published: 11.07.2016
• 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

PROBLEM TO BE SOLVED: To provide a system which secures favorable responsiveness with respect to a start requirement during a stop of an engine even if there occurs an abnormality in the supply of hydraulic pressure to a starting friction fastening element from a hydraulic pressure source such as an electric oil pump which operates in an engine stop state such as an idle stop time.SOLUTION: A hydraulic pressure control method of an automatic transmission supplies hydraulic pressure generated at a first hydraulic pressure source 6 driven by an engine to a first friction fastening element 60 for obtaining a first gear change ratio when obtaining the starting first gear change ratio during an operation of the engine, and when obtaining the first gear change ratio during a stop of the engine, supplies hydraulic pressure generated at a second hydraulic pressure source 106 which operates irrespective of the engine to the first friction fastening element 60. When there arises a prescribed state during the stop of the engine, the hydraulic pressure control method supplies the hydraulic pressure generated at the second hydraulic pressure source 106 to a second friction fastening element 50 for obtaining a second gear change ratio which is different from the first gear change ratio.SELECTED DRAWING: Figure 3 【課題】アイドルストップ時等のエンジン停止状態で作動する電動式オイルポンプ等の油圧源から発進用摩擦締結要素への油圧供給に異常が生じた場合にも、エンジン停止中における発進要求に対する良好な応答性を確保するシステムを提供する。【解決手段】エンジンの運転中に発進用の第１変速比を実現するときには、エンジンにより駆動される第１油圧源６で生成された油圧を、第１変速比を実現するための第１摩擦締結要素６０に供給し、エンジンの停止中に第１変速比を実現するときには、エンジンとは無関係に作動する第２油圧源１０６で生成された油圧を第１摩擦締結要素６０に供給する自動変速機の油圧制御方法であって、エンジンの停止中に所定の状態となったとき、第２油圧源１０６で生成された油圧を、第１変速比とは異なる第２変速比を実現するための第２摩擦締結要素５０に供給する。【選択図】図３