Torque and speed control in a machine with continuously variable transmission

A machine comprising:

• a continuously variable transmission (CVT) operatively coupled to a power source,
• the CVT producing a CVT output torque and a CVT output speed;
• a first operator input device producing an operator input signal indicating a change in operation of the machine;
• and
• a controller communicating with the first operator input device and controlling output of the CVT in accordance with a control map, the control map including a torque-to-speed curve relating the CVT output torque to the CVT output speed and an under-run curve corresponding to a target speed;
• wherein the first operator input device simultaneously adjusts the torque-to-speed curve and the under-run curve.

A method of regulating CVT output of a continuously variable transmission (CVT), the CVT output including a CVT output torque and a CVT output speed, the method comprising:

• receiving a first operator input signal indicating a target speed;
• determining the CVT output torque in accordance with a torque-to-speed curve if the CVT output speed is a predetermined quantity less than the target speed;
• determining the CVT output torque in accordance with an under-run curve if the CVT output speed is within the predetermined quantity of the target speed;
• receiving a second operator input signal to adjust operation of the CVT;
• and
• adjusting the torque-to-speed curve and the under-run curve upon receiving the second operator input signal to reduce the CVT output torque available and the target speed.