The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 21, 2013
Filed:
Aug. 12, 2009
Hideharu Yamamoto, Fujinomiya, JP;
Kenichi Kaizu, Fuji, JP;
Hideki Ishii, Numazu, JP;
Toshiomi Nebashi, Fuji, JP;
Fumitaka Nagashima, Fuji, JP;
Ryusuke Ooshiro, Shizuoka, JP;
Hideharu Yamamoto, Fujinomiya, JP;
Kenichi Kaizu, Fuji, JP;
Hideki Ishii, Numazu, JP;
Toshiomi Nebashi, Fuji, JP;
Fumitaka Nagashima, Fuji, JP;
Ryusuke Ooshiro, Shizuoka, JP;
JATCO Ltd, Fuji-shi, JP;
Abstract
An automatic transmission system includes a transmission having transmission elements with lubrication-requiring portions and hydraulic actuators therefor, a switching valve that supplies hydraulic fluid to the hydraulic actuators, a valve actuator 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. 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.