Patent ID: 8000863

Claim:
A method of controlling an output torque of a variator having a hydraulic actuator responsive to an actuator pressure signal, the method comprising: receiving an indication of a first desired torque from an operator interface; evaluating a plurality of parameters related to operation of the variator; reading a map to link the plurality of parameters to a first mapped value for the actuator pressure signal, wherein the first desired torque is associated with the first mapped value; applying the first mapped value to the hydraulic actuator as an actuator pressure signal; measuring a first actual output torque of the variator and comparing the first actual output torque to the first desired output torque to derive an error value; deriving a supplement value comprising one of a pressure supplement value and a motor torque supplement value based on the error value, wherein deriving a pressure supplement value based on the error value includes multiplying the error value by a gain factor to yield a pressure supplement value; receiving an indication of a second desired torque from the operator interface; reevaluating the plurality of parameters related to operation of the variator; reading the map to link the plurality of variables to a second mapped value for the actuator pressure signal, wherein the second desired torque is associated with the second mapped value; modifying the second mapped value via the pressure supplement value to produce an adjusted actuator pressure signal; and applying the adjusted actuator pressure signal to the hydraulic actuator to control the output torque of the variator.