Shift control method for automatic transmission and system there

Details Shift control method for automatic transmission and system there Shift control method for automatic transmission and system there

1997-09-22

1999-03-23

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477154, 701 59, F16H 6104

Patent

active

058851887

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.

REFERENCES:
patent: 5127288 (1992-07-01), Hojo et al.
patent: 5157989 (1992-10-01), Asada
patent: 5269204 (1993-12-01), Moroto et al.
patent: 5393275 (1995-02-01), Okada et al.
patent: 5393277 (1995-02-01), White et al.
patent: 5401223 (1995-03-01), White et al.

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