Continuous speed variable transmission control method

Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position

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3644241, B60K 4122

Patent

active

050741667

ABSTRACT:
A method for controlling a continuously variable transmission having a pair of pulleys each of which includes a groove defined between a stationary pulley element and a movable pulley element, including the step of using hydraulic oil for increasing and decreasing the width of the groove to respectively decrease and increase the radius of rotation of a belt looped around the pulleys to thereby vary the belt ratio. A hydraulic clutch is provided, and connection and disconnection of the clutch is controlled according to various predetermined control modes. Line pressure is controlled with a control device which uses both open loop control, and closed loop feedback control responsive to a signal from a pressure sensor. During open loop control, the line pressure is controlled so as to reflect the clutch pressure during a vehicle start mode.

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patent: 4982822 (1991-01-01), Petzold et al.

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