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:
Apr. 01, 1997
Filed:
Nov. 24, 1995
Kazumasa Tsukamoto, Toyota, JP;
Masahiko Ando, Okazaki, JP;
Akira Fukatsu, Anjo, JP;
Toshiyuki Mae, Anjo, JP;
Motoyuki Sakai, Aichi-ken, JP;
Tetsuo Hamajima, Toyota, JP;
Masato Kaigawa, Toyota, JP;
Kagenori Fukumura, Toyota, JP;
Hidehiro Oba, Numazu, JP;
Yasuo Hojo, Nagoya, JP;
Atsushi Tabata, Okazaki, JP;
Nobuaki Takahashi, Toyota, JP;
Aisin Aw Co., Ltd., , JP;
Abstract
A hydraulic control system for an automatic transmission includes a regulator valve in a hydraulic circuit for supplying pressure to a servo of a frictional engagement element. The regulator valve has an input port, an output port and a drain port. A valve member of the regulator valve includes a pressure receiving area fed with a feedback pressure from the portion of the hydraulic circuit between the regulator valve and the servo, and another pressure receiving area selectively fed with pressure from a signal pressure source. A further pressure receiving area, having a surface area different from the another pressure receiving area, is constantly fed pressure from the signal pressure source.