Method of controlling clutch of continuously variable...

F - Mech Eng,Light,Heat,Weapons – 16 – H

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341/68

F16H 61/662 (2006.01)

Patent

CA 1325836

METHOD OF CONTROLLING CLUTCH OF CONTINUOUSLY VARIABLE TRANSMISSION SYSTEM ABSTRACT OF THE DISCLOSURE A method of controlling a clutch of a continuously variable transmission system which controls a transmission system by either expanding or contracting the width of a channel between a stationary pulley member and an axially movable pulley member to expand or contract the radius of rotation of a belt wound on the pulleys to eventually vary the belt ratio. The continuously variable transmission system includes a controller unit which executes a control operation by feeding actually detected clutch pressure back to an objective clutch pressure, and an oil-pressure circuit which controls oil pressure in response to signals from the controller unit. The control system implements the sequential steps of (a) delivering a variety of signals denoting the status of the driven vehicle to said con- troller unit, and (b) causing the controller unit to output signals to the oil-pressure circuit when the controller unit identifies the presence of a hold mode before even- tually causing the oil-pressure circuit to control the clutch pressure to a predetermined level.

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