Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1992-11-27
1995-05-02
Wright, Dirk
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
477148, 477146, 477154, F16H 540
Patent
active
054114519
ABSTRACT:
A control system is provided for servo hydraulic pressure in an automatic transmission. Upon downshifting, one of first and second frictional engagement devices is released while the other is engaged. A directional control valve is provided to feed or drain servo hydraulic pressure to selectively engage or release the first and second devices. The hydraulic pressure is regulated by a pressure regulator under the control of an electronic control unit. Detectors are also provided to determine input rotation and torque, respectively. The regulator is interposed between the directional control valve and the engaged device. The regulator is controlled to maintain the servo hydraulic pressure at a predetermined value under the control of the electronic control unit until predetermined input rotation is detected and then to gradually raise the servo hydraulic pressure under the control of the electronic control on the basis of the value of input torque.
REFERENCES:
patent: 4653350 (1987-03-01), Downs et al.
patent: 5046174 (1991-09-01), Lentz et al.
patent: 5046383 (1991-09-01), Butts et al.
patent: 5079970 (1992-01-01), Butts et al.
Ando Masahiko
Hayabuchi Masahiro
Hojo Yasuo
Kubo Seitoku
Noda Koji
Aisin Aw Co. Ltd.
Ta Khoi Q.
Wright Dirk
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