Patent ID: 6916269

Claim:
A V-belt type continuously variable transmission (CVT), comprising: primary and secondary pulleys arranged on input and output sides, the pulleys having V-grooves, the pulleys being subjected to primary-pulley and secondary-pulley pressures produced from a line pressure; a V-belt looped over the primary and secondary pulleys to engage in the V-grooves; a shift actuator having a first position corresponding to a target shift ratio, the shift actuator being operated to the first position to change a width of the V-grooves through a differential pressure between the primary-pulley and secondary-pulley pressures, achieving the target shift ratio; and an electronic control unit (ECU) which controls the shift actuator, the ECU being so constructed as to: calculate a second position of the shift actuator corresponding to an actual shift ratio through conversion of the actual shift ratio expressed by a rotational-speed ratio between the primary and secondary pulleys, calculate a displacement between the second position of the shift actuator and an actual position thereof, calculate a correction amount of the line pressure to reduce the displacement, and correct the line pressure in accordance with the correction amount.