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:
Dec. 31, 1996
Filed:
Jun. 01, 1995
Kazumasa Tsukamoto, Toyota, JP;
Masahiko Ando, Okazaki, JP;
Masahiro Hayabuchi, Anjo, JP;
Akira Fukatsu, Anjo, JP;
Toshiyuki Mae, Anjo, JP;
Masato Kaigawa, Toyota, JP;
Kagenori Fukumura, Toyota, JP;
Hidehiro Oba, Aichi-gun, JP;
Yasuo Hojo, Nagoya, JP;
Hiromichi Kimura, Okazaki, JP;
Atsushi Tabata, Okazaki, JP;
Tetsuo Hamajima, Toyota, JP;
Nobuaki Takahashi, Toyota, JP;
Aisin AW Co., Ltd., , JP;
Abstract
A control system for an automatic transmission includes a first frictional engagement element and a second frictional engagement element; and a first hydraulic servo for controlling the application/release of the first frictional engagement element and a second hydraulic servo for controlling the application/release of the second frictional engagement element. A regulator valve regulates the oil pressure to the first hydraulic servo. A signal pressure is applied to the regulator valve to establish a predetermined gear stage by switching the applied/released states of the first frictional engagement element and the second frictional engagement element by feeding/releasing oil pressure to/from the first hydraulic servo and the second hydraulic servo. The regulator valve includes a valve member having: a first pressure receiving area to which is applied the feed pressure to the first hydraulic servo as a feedback pressure in a first direction; a second pressure receiving area to which is applied the signal pressure in a second direction opposite the first direction; a fourth pressure receiving area to which is applied the feed pressure to the second hydraulic servo in the first direction, in a shift wherein the first frictional engagement element is released while the second frictional-engagement element is applied; and a third pressure receiving area to which is applied the signal pressure in the second direction, for regulation of the oil pressure only during a shift.