Title:
自動変速機
Document Type and Number:
Japanese Patent JP4558821
Kind Code:
B2
Abstract:
An automatic transmission system includes a transmission having transmission elements with lubrication-requiring portions (7,8) and hydraulic actuators (9) therefor, a switching valve (1) that supplies hydraulic fluid to the hydraulic actuators, a valve actuator (31) that actuates the switching valve, a shift range detection unit that detects a selected shift range of the transmission, and a control unit that controls the valve actuator to actuate the switching valve in accordance with the selected transmission shift range. The switching valve has a bypass position to provide a supply of the hydraulic fluid to the lubrication-requiring portions by bypassing a transmission oil cooler (5). The control unit judges whether the transmission is in a low lubrication state based on a given operating parameter of the transmission and controls the valve actuator to switch the switching valve to the bypass position at the time the transmission is judged as being in the low lubrication state.
Inventors:
Hideharu Yamamoto
Kenichi Kaizu
Hideki Ishii
Toshiomi Nehashi
Fumitaka Nagashima
Ryusuke Oshiro
Kenichi Kaizu
Hideki Ishii
Toshiomi Nehashi
Fumitaka Nagashima
Ryusuke Oshiro
Application Number:
JP2008218543A
Publication Date:
October 06, 2010
Filing Date:
August 27, 2008
Export Citation:
Assignee:
JATCO Co., Ltd.
International Classes:
F16H61/00; F16H61/02; F16H61/28; F16H59/72
Domestic Patent References:
| JP2002266993A | ||||
| JP2007211968A | ||||
| JP2002213587A |
Attorney, Agent or Firm:
Yu Sanada