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. 24, 1992
Filed:
Oct. 31, 1990
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A shift control system and method for use in an automatic transmission includes a plurality of frictional engagement elements and a gear train settable to a plurality of speed stages of different gear ratios according to the engagement/release states of the frictional engagement means and having a plurality of different engagement/release combinations for the frictional engagement elements to set a predetermined one of the speed stages. A shift decision unit decides a shift to be performed. A speed stage selection determines a speed stage to be set after the shift. An engagement/release pattern selects and outputs one of the engagement/release combinations of the frictional engagement elements for setting a speed in which either the current speed stage or the speed stage to be set after the shift is the predetermined speed stage, wherein two or less of the frictional engagement elements have their engagement/release states switched during the shift.