Shift controller using shift timing or speed ratio dependent on

Details Shift controller using shift timing or speed ratio dependent on Shift controller using shift timing or speed ratio dependent on

1993-01-25

1995-05-23

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477148, F16H 566

Patent

active

054176271

ABSTRACT:
An automotive automatic transmission includes a one-way clutch and solenoids which, when switched in ON-OFF manner, induces a speed change of the transmission. The rotation speed ratio between input and output shafts of the transmission is obtained. When a speed change becomes necessary, a judgment is carried out as to whether the necessary speed change is of a type which needs the engaged condition of the one-way clutch or not. If the speed change needs the engaged condition of the one-way clutch, switching of the solenoids is carried out when the rotation speed ratio comes to a predetermined value, while, if the speed change does not need the engaged condition of the one-way clutch, switching of the solenoids is carried out when a predetermined time is passed from the time when the necessity of the speed change is made.

REFERENCES:
patent: 4970916 (1990-11-01), Narita
patent: 5079971 (1992-01-01), Yoshimura et al.
patent: 5113722 (1992-05-01), Iizuka
patent: 5161432 (1992-11-01), Matsumoto et al.
patent: 5235877 (1993-08-01), Takahashi et al.
Patent Abstracts of Japan, M-1031 Sep. 28, 1990, vol. 14, No. 454 and JP-2-180362, published Jul. 13, 1990.
Patent Abstracts of Japan, M-976 May 21, 1990, vol. 14, No. 237, and JP-2-62470, published Mar. 2, 1990.

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