Control system for lock-up clutch of automatic transmission

Details Control system for lock-up clutch of automatic transmission Control system for lock-up clutch of automatic transmission

1991-11-25

1992-09-08

Wright, Dirk

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

192 333, F16D 3300

Patent

active

051450453

ABSTRACT:
A control system for a lock-up clutch of an automatic transmission is provided which serves to change a variation rate of control pressure between partial engagement operation and full engagement operation, which adjusts a degree of lock-up clutch engagement. The system includes a lock-up control valve and a switching valve. The lock-up control valve is responsive to hydraulic pressure input to a first pilot port which is lower than a preselected threshold level to vary a pressure difference between apply and release chambers gradually at a first rate to establish disengagement or partial engagement of the lock-up clutch. The switching valve is responsive to hydraulic pressure input to a pilot port which is higher than a preselected threshold level to provide pilot pressure of a preselected level to a second pilot port of the lock-up control valve. The lock-up control valve is responsive to input of pressure into first and second pilot ports to vary the pressure difference between the apply and release chambers at a second rate greater than the first rate to establish full engagement of the lock-up clutch.

REFERENCES:
patent: 4664235 (1987-05-01), Yokoyama et al.
patent: 4989702 (1991-02-01), Yoshimura et al.
patent: 5054590 (1991-10-01), Paulsen
patent: 5058716 (1991-10-01), Lippe et al.
patent: 5090527 (1992-02-01), Imamura et al.

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