Control system for a hydrokinetic torque converter lock-up clutc

Details Control system for a hydrokinetic torque converter lock-up clutc Control system for a hydrokinetic torque converter lock-up clutc

1990-08-22

1991-10-22

Herrmann, Allan D.

192 clutches and power-stop control

Vortex-flow drive and clutch

Fluid-pressure operator for engaging clutch

192 33, 192 331, F16D 3312

Patent

active

050587161

ABSTRACT:
A control system for a torque converter lock-up clutch operates in a hydraulic circuit having line pressure applied to a lock-up clutch control valve and supplied selectively to a clutch-apply pressure chamber or a clutch-release pressure chamber. The control valve includes a valve spool, four control lands and a valve spring urging the control body to a starting position where the valve directs line pressure to the release pressure chamber and connects the apply pressure chamber to a cooler. When control pressure is applied, the valve spool moves to a shift-up position, supplies line pressure to the apply pressure chamber and connects the release-pressure chamber to an outlet line. A pulse-width modulated solenoid valve varies pressure in the release-pressure chamber by means of a throttle opening in the clutch plate, whereby control pressure is modulated so that force between the friction surfaces of the clutch is reduced to allow clutch slippage.

REFERENCES:
patent: 4051932 (1973-10-01), Arai et al.
patent: 4391166 (1983-07-01), Kubo et al.
patent: 4582185 (1986-04-01), Grimes et al.
patent: 4720003 (1988-01-01), Murasugi
patent: 4843920 (1989-07-01), Hayasaki et al.
patent: 4880090 (1989-11-01), Ando
patent: 4966263 (1990-10-01), Hayasaki

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