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:
Mar. 23, 1999
Filed:
Sep. 22, 1997
Naonori Iizuka, Fuji, JP;
Jatco Corporation, Fuji, JP;
Abstract
A method and system for controlling shift in an automatic transmission that can establish a plurality of gear ratios by selectively supplying a hydraulic pressure for a plurality of frictional engaging elements. The shift control system for the automatic transmission includes a device for selecting either an automatic shifting mode, in which predetermined gear ratios are established depending upon a vehicle driving condition, or a manual shifting mode, in which predetermined gear ratios are established by manual operation; a learning control unit for optimizing hydraulic pressure for the frictional engaging elements on the basis of an actual shifting condition; a learning control inhibiting unit for inhibiting learning control by the learning control unit when the manual shifting mode is selected; and a learning control inhibiting release unit that enables learning control by the learning control unit and disables inhibition of learning control by the learning control inhibiting unit when a shifting operation in the manual shifting mode is taken place under a vehicle driving condition falling within a predetermined zone. The invention prevents increasing of shift shock in the manual shifting mode without using RAM having large capacity.