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. 11, 2010
Filed:
Mar. 15, 2007
Hideharu Yamamoto, Fujinomiya, JP;
Kenichi Kaizu, Fuji, JP;
Hiroshi Sekiguchi, Fuji, JP;
Yukiyoshi Inuta, Sagamihara, JP;
Hiroki Kumashiro, Fuji, JP;
Hideharu Yamamoto, Fujinomiya, JP;
Kenichi Kaizu, Fuji, JP;
Hiroshi Sekiguchi, Fuji, JP;
Yukiyoshi Inuta, Sagamihara, JP;
Hiroki Kumashiro, Fuji, JP;
Jatco Ltd, Fuji-shi, JP;
Abstract
An automatic transmissions control system varies times to start a shift to securing a good response in engagement pressure for an engagement-side frictional element as well as suppressing occurrence of hydraulic pressure vibrations at low temperatures. The control system has an engagement pressure at-low-temperature regulation section that selectively controls at least one of the first and second engagement-pressure regulator valves, when the oil temperature is detected to be lower than a predetermined oil temperature and the shift condition is determined to exist requiring a shift operation such that the first engagement-pressure regulator valve provides a maximum hydraulic pressure to engage the first frictional element to start a shift with the maximum hydraulic pressure being continuously provided until the shift ends, and/or the second engagement-pressure regulator valve provides a minimum hydraulic pressure to obtain complete disengagement of the second frictional element to start a downshift as the shift operation.