Title:
【発明の名称】自動変速機の液圧制御装置
Document Type and Number:
Japanese Patent JP2856255
Kind Code:
B2
Abstract:
A downshift control in an automatic transmission is disclosed wherein magnitude of servo activating hydraulic fluid pressure is temporarily decreased as a function of vehicle speed when the automatic transmission effects a downshift from a current gear ratio to a new gear ratio. Owing to this arrangement, a fluid operated frictional device associated with the current gear ratio is released quickly without any lag to allow quick increase in engine speed during the downshift with the throttle fully opened at a high vehicle speed, i.e., a power-on downshift at high vehicle speed.
Inventors:
WAKAHARA TATSUO
IWANAGA KAZUYOSHI
ISHII SHIGERU
IWANAGA KAZUYOSHI
ISHII SHIGERU
Application Number:
JP4875789A
Publication Date:
February 10, 1999
Filing Date:
February 28, 1989
Export Citation:
Assignee:
NITSUSAN JIDOSHA KK
International Classes:
F16H59/24; F16H61/04; F16H59/42; F16H59/44; F16H59/46; F16H59/70; F16H61/02; F16H61/06; F16H61/08; F16H61/18; (IPC1-7): F16H61/04
Domestic Patent References:
| JP63195148U |
Attorney, Agent or Firm:
Fujiya Shiga (2 outside)