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:
Aug. 20, 1996
Filed:
Oct. 14, 1994
Shinya Kamada, Hiroshima, JP;
Hiroaki Yokota, Higashi-hiroshima, JP;
Shigeru Nagayama, Hiroshima, JP;
Yuji Nakahara, Hiroshima, JP;
Shin Nakano, Higashi-hiroshima, JP;
Toshihisa Marusue, Hiroshima, JP;
Mitsutoshi Abe, Hiroshima-ken, JP;
Hiroyuki Matsumoto, Ibaraki-ken, JP;
Mazda Motor Corporation, Hiroshima-ken, JP;
Abstract
A shift control system of an automatic transmission includes a first element which is to be released in a shift operation, a second element which is to be engaged in the shift operation, and a target shift time set section for setting a target time period of the shift operation needed for releasing the first frictional element and engaging the second frictional element. A shift time calculation section is provided for obtaining an actual time period of the shift operation needed for releasing the first frictional element and engaging the second frictional element, and a releasing pressure control section is provided for receiving output of the target shift time set section and the shift time calculation section for controlling a releasing pressure of the first frictional element in the shift operation based on the difference between the target and actual time periods of the shift operation. An engaging pressure control section is used for controlling an engaging pressure of the second frictional element in the shift operation. A shift shock is effectively suppressed by the shift control system.