Continuously variable transmission ratio measuring device

A vehicle, comprising:

• a power plant configured to generate input torque;
• a CVT including a drive pulley, a driven pulley, and an endless rotatable device coupled between the drive pulley and the driven pulley, wherein the drive pulley is coupled to the power plant such that the drive pulley is configured to receive the input torque from the power plant;
• an actuator coupled to the drive pulley such that the actuator is configured to exert a clamping force on the drive pulley;
• an angle sensor coupled to the endless rotatable device such that the angle sensor is configured to measure an angular position of the endless rotatable device;
• and
• a controller in communication with the actuator and the angle sensor, wherein the controller is programmed to:
• determine a speed ratio of the CVT based on the angular position of the endless rotatable device;
• and
• control the actuator to adjust the clamping force exerted on the drive pulley in response to determining the speed ratio of the CVT.

A method for controlling a continuously variable transmission (CVT), comprising:

• determining a first speed ratio based on an angular position of an endless rotatable device of the CVT;
• determining a second speed ratio based on an input speed and an output speed of the CVT;
• determining a difference between the first speed ratio and the second speed ratio;
• determining that the difference between the first speed ratio and the second speed ratio is greater than a predetermined ratio threshold;
• and
• controlling, by a controller, an actuator of the CVT to adjust a clamping force exerted on a drive pulley in response to determining the difference between the first speed ratio and the second speed ratio is greater than the predetermined ratio threshold.