Method and apparatus for controlling automatic transmission

Details Method and apparatus for controlling automatic transmission Method and apparatus for controlling automatic transmission

1992-05-22

1994-02-15

Bonck, Rodney H.

192 clutches and power-stop control

Transmission control and clutch control

Common control

192 8718, 475128, F16D 2511, B60K 4122

Patent

active

052858804

ABSTRACT:
In an automatic transmission including first and second planetary gear sets and a plurality of friction elements, during an up-shift and a time after the up-shift, a hydraulic pressure of a released friction element is kept at a predetermined value corresponding to the biasing force of a return spring set in the control valve of the friction element for a predetermined time after the end of the up-shift. When a down-shift is carried out immediately after the above-mentioned up-shift, the engagement of the released friction element is rapidly carried out since the hydraulic pressure of the friction element is kept at the predetermined value.

REFERENCES:
patent: 3707890 (1973-01-01), Ito
patent: 4219109 (1980-08-01), Ushijima et al.
patent: 4718310 (1988-01-01), Shindo et al.
patent: 4790418 (1988-12-01), Brown et al.
patent: 5029086 (1991-07-01), Yoshimura
patent: 5079970 (1992-01-01), Butts et al.
patent: 5115722 (1992-05-01), Ichihashi et al.
Nissan Full-Range Electonically Controlled Automatic Transmission RE4R01A Type pp. 1-53--1-73, Mar. 1987.

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