POSITION CONTROLLER OF A CONTINUOUSLY VARIABLE TRANSMISSION

A position controller (140) that performs position control by outputting a drive signal to a control valve (25) of a hydraulic actuator (20) that changes an operating position of a transmission element (16) so as to change a transmission ratio of a continuously variable transmission (10), the position controller (140) comprising: an oil temperature acquisition unit (35) that acquires information of an oil temperature of the hydraulic actuator (20); an actual transmission ratio acquisition unit (44) that acquires an actual value of the transmission ratio; a position acquisition unit (42) that acquires an actual value of an operation position of the transmission element (16); a target position calculation unit (48) that calculate a target value of the operating position of the transmission element (16) by first closed-loop control (LP1) so as to reduce a deviation between a command value of the transmission ratio and the actual value of the transmission ratio; a position control unit that calculates an operation command value for the control valve by second closed-loop control (LP2) so as to reduce a deviation between the target value of the operation position of the transmission element and the actual value of the operation position of the transmission element; and a gain setting unit (160) that changes a gain (Gi) of the first closed-loop control (LP1) so that sensitivity of the first closed-loop control (LP1) decreases as the oil temperature decreases.