Control system for torque converter of automatic transmission

Details Control system for torque converter of automatic transmission Control system for torque converter of automatic transmission

1989-10-30

1991-02-05

Lorence, Richard

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

192 331, 74890, 475 65, F16H 4502, F16H 6114

Patent

active

049897020

ABSTRACT:
A control system for a torque converter includes a lock-up clutch provided in a torque converter for connecting an input member and an output member of the torque converter directly. An engaging and disengaging hydraulic device controls an engaging and disengaging action of the lock-up clutch. A shift valve provided with a first and second spools in series controls introduction of a driving hydraulic pressure into the hydraulic device. The first spool of the shift valve is subjected to a first hydraulic pressure at one end, while the second spool is subjected to a second hydraulic pressure at the other end. The first and second spools are subjected to a third hydraulic pressure therebetween. The control system further includes a first control device for controlling the first hydraulic pressure, a second control device for controlling the second hydraulic pressure, an adjusting valve for adjusting the driving hydraulic pressure introduced into the engaging or disengaging hydraulic device, and a third control device for controlling a hydraulic pressure for controlling the adjusting valve. Converter, lock-up and slip conditions of the torque converter can be selectively established by switching shift positions of the single shift valve.

REFERENCES:
patent: 4468988 (1984-09-01), Hiramatsu
patent: 4531433 (1985-07-01), Suga
patent: 4580671 (1986-04-01), Matsuoka et al.
patent: 4618036 (1986-10-01), Ideta
patent: 4618041 (1986-10-01), Sotoyama et al.
patent: 4650047 (1987-03-01), Nishikawa et al.
patent: 4660693 (1987-04-01), Taga et al.
patent: 4664235 (1987-05-01), Yokoyama et al.
patent: 4669441 (1987-06-01), Okimoto
patent: 4687083 (1987-08-01), Sotoyama et al.
patent: 4720003 (1988-01-01), Murasugi

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