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:
Jan. 25, 2005
Filed:
Jun. 09, 2003
Takuya Fujimine, Anjo, JP;
Akira Fukatsu, Anjo, JP;
Kazuyuki Noda, Anjo, JP;
Masahiko Ando, Anjo, JP;
Kazutoshi Nozaki, Toyota, JP;
Toshiki Kanada, Toyota, JP;
Takuya Fujimine, Anjo, JP;
Akira Fukatsu, Anjo, JP;
Kazuyuki Noda, Anjo, JP;
Masahiko Ando, Anjo, JP;
Kazutoshi Nozaki, Toyota, JP;
Toshiki Kanada, Toyota, JP;
Aisin Aw Co., Ltd., , JP;
Abstract
A hydraulic control system for an automatic transmission includes a 3-4 shift valve that outputs a source pressure through a first path for shift speeds lower than a fourth shift speed established by directly connecting an input shaft with an output shaft of the automatic transmission, i.e., third shift speed. The hydraulic control system further includes a clutch apply control valve that outputs a source pressure through a second path at a shift speed higher than the fourth shift speed, i.e., fifth speed. The 3-4 shift valve and the clutch apply control valve serve to interrupt supply of the source pressure through the first path and the second path, respectively, in the fourth speed or the lock-up stage.