Method for controlling speed change of automatic speed change gear

Abstract

Abstract PURPOSE:To remove speed change shock and improve speed change sense by starting and finishing change of rotating number of a sub speed change gear to low gear shift while a main speed change gear changes rotating number to high gear shift and by performing up shift entirely. CONSTITUTION:When speed change is judged, an electromagnetic solenoid valve S1 is turned ON so as to changeover a first shift valve 200 which controls a main speed change gear after a predetermined time T1, and a piston of a brake B2 ends stroke and an inertial phase of the main speed change gear is started and rotating number of respective members of the main speed change gear begins to change. Then, speed change instruction is given to an electromagnetic solenoid valve S3 and a third shift valve 300 is changed over to drain oil pressure of a brake B0, and low gear shift of a sub speed change gear is started, and change of rotating number is completed within the time when the main speed change gear is still in the inertial phase.

Inventors

• 👤 Yoshio Shindo
• 👤 新藤　義雄
• 👤 Kunihiro Iwatsuki
• 👤 邦裕 岩月
• 👤 Yasushi Ando
• 👤 安藤　泰志

Bibliographic Details