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:
Sep. 30, 2003
Filed:
Nov. 29, 2001
Masahiro Hayabuchi, Anjo, JP;
Masaaki Nishida, Anjo, JP;
Hiroshi Tsutsui, Anjo, JP;
Kouichi Kojima, Anjo, JP;
Yutaka Teraoka, Anjo, JP;
Nobuhiro Iwai, Anjo, JP;
Kiyoshi Akutsu, Anjo, JP;
Aisin AW Co., Ltd., Anjo, JP;
Abstract
At the time of the 6→3 speed shift, an automatic transmission achieves a 6→4→3 speed shift by controlling the servo pressures of four engageable elements. A control apparatus controls the servo pressure of one engageable element in accordance with the servo pressures of other engageable elements. The engagement and release timings are adjusted by determining and controlling the oil pressures of the hydraulic servos, taking into consideration the 6→4 shift state (torque sharing) during a shift transitional period. Therefore, engine blow and prolongation are prevented during the 6→3 shift control.