Clutch pressure control device for continuously variable...

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F16D 43/28 (2006.01) F16H 61/662 (2006.01)

Patent

CA 2004185

CLUTCH PRESSURE CONTROL DEVICE FOR CONTINUOUSLY VARIABLE TRANSMISSION ABSTRACT OF THE DISCLOSURE 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 accord- ing 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.

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