Clutch pressure control device for continuously variable transmi

Details Clutch pressure control device for continuously variable transmi Clutch pressure control device for continuously variable transmi

1989-11-29

1991-06-18

Bonck, Rodney H.

192 clutches and power-stop control

Vortex-flow drive and clutch

With brake

192109F, F16D 2514, B60K 4102

Patent

active

050243101

ABSTRACT:
A continuously variable transmission has a fixed pulley piece and a movable pulley piece supported on the fixed pulley piece so that the movable pulley piece can be moved toward and away from the fixed pulley piece, the width of a groove between the pieces being increased or decreased by changing hydraulic pressure so that the rotational radius of a belt looped around the pulleys is increased or decreased to vary a belt ratio. A clutch pressure control device includes a hydraulic clutch for which engagement and disengagement is controlled according to various control modes, and a control arrangement which calculates a target clutch pressure with reference to a slip amount of the hydraulic clutch and which feedback controls the target clutch pressure so that the slip amount of the clutch is maintained substantially constant.

REFERENCES:
patent: 4458318 (1984-07-01), Smit
patent: 4475416 (1984-10-01), Underwood
patent: 4487303 (1984-12-01), Boueri et al.
patent: 4718308 (1988-01-01), Haley

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