Method of controlling a hydraulic continuously variable transmission
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United States of America Patent
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-
Aug 5, 2014
Grant Date -
Mar 28, 2013
app pub date -
Mar 26, 2012
filing date -
Sep 15, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A method of controlling a hydraulic CVT of a vehicle comprises: determining a speed of rotation of a driving shaft; determining a speed of rotation of a driven shaft; determining a ratio of the speed of rotation of the driving shaft versus the speed of rotation of the driven shaft; determining an engine torque; determining a base clamping force to be applied by the driving pulley onto the belt based on the ratio and the engine torque; determining a desired speed of rotation of the driving shaft; determining a corrective clamping force by comparing the speed of rotation of the driving shaft to the desired speed of rotation of the driving shaft; and controlling a hydraulic pressure applied to a movable sheave to apply a sum of the base and corrective clamping forces onto the belt. A vehicle having a CVT controlled by the method is also disclosed.
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