Patent ID: 8798882
Filing Date: 2014-08-05
Classification: B60W,B60Y,F16H

Abstract:
1. A method of controlling a hydraulic continuously variable transmission of a vehicle; the continuously variable transmission including a driving pulley disposed on a driving shaft for rotation therewith, a driven pulley disposed on a driven shaft for rotation therewith, and a belt operatively connecting the driving pulley with the driven pulley; the driving pulley including a fixed sheave, a movable sheave, and a spring biasing the movable sheave away from the fixed sheave; the driving shaft being driven by an engine of the vehicle; the method comprising: determining a drive ratio of the continuously variable transmission; and controlling a hydraulic pressure applied to the movable sheave to apply a total clamping force onto the belt that is less than a clamping force necessary to cause the belt to rotate synchronously with the driving pulley when the drive ratio corresponds to a low gear ratio condition.