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:
Nov. 29, 1994
Filed:
Nov. 27, 1992
Masahiko Ando, Okazaki, JP;
Koji Noda, Anjo, JP;
Yoshihisa Yamamoto, Nishio, JP;
Masahiro Hayabuchi, Anjo, JP;
Kazumasa Tsukamoto, Toyota, JP;
Yasuo Hojo, Nagoya, JP;
Seitoku Kubo, Toyota, JP;
Yutaka Taga, Aichi, JP;
Hidehiro Oba, Aichi, JP;
Aisin Aw Co., Ltd., both of, JP;
Other;
Abstract
A method is provided for the control of servo hydraulic pressure in an automatic transmission. Servo hydraulic pressure is adapted to engage or release first and second frictional engagement elements arranged in such a relationship that, upon shifting from one particular speed stage to another, one of the first and second frictional engagement elements is released while the other is engaged. The servo hydraulic pressure, engaging one frictional engagement element, is linearly lowered in a torque phase during a shift so it releases the one frictional engagement element, responsive to a rise in the servo hydraulic pressure to the frictional engagement element to be engaged, to maintain an inversely proportional relationship between the servo hydraulic pressure being raised and that being released.