Automatic transmission control device

Details Automatic transmission control device Automatic transmission control device

1996-05-10

1998-01-13

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477149, B60K 4110

Patent

active

057073180

ABSTRACT:
An automatic transmission control device for use in controlling an automatic transmission that includes a plurality of friction engaging devices disposed between the rotational shaft of the engine and the output shaft in order to control gear ratios includes a control device which controls the engaging operation and the disengaging operation of each of the friction engaging devices. The control device changes the time when the engagement side friction engaging device begins to engage based on the gear ratio from which the power-on down shift operation is being made and the gear ratio to which the power-on down shift operation is being made. Thus, in the case of a 4.fwdarw.2 power-on down shift operation the time when the engagement side friction engaging device begins to engage is longer than during a 3.fwdarw.2 power-on down shift operation. In this way, temporary increases in the engine rotational speed are prevented and shift shock is avoided.

REFERENCES:
patent: 4727773 (1988-03-01), Sumiya et al.
patent: 4833945 (1989-05-01), Kondo
patent: 5058461 (1991-10-01), Shimei
patent: 5070747 (1991-12-01), Lentz et al.
patent: 5188006 (1993-02-01), Goto et al.
patent: 5319998 (1994-06-01), Iwatsuki et al.
patent: 5383825 (1995-01-01), El-Khoury et al.
Manual for the Toyota Toyoace New Automobile, pp. 5-53 (published in 1985).

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