Control device for continuously variable transmission

A control device for a continuously variable transmission,

• the continuously variable transmission including an input-side primary pulley, an output-side secondary pulley, and a belt wound around the primary and secondary pulleys,
• the control device comprising:
• a secondary-pressure control section configured to control a secondary pressure which is supplied to the secondary pulley, by a command secondary pressure,
• wherein the command secondary pressure is given by a feedback control including an integral action based on a difference between a target secondary pressure and an actual secondary pressure,
• the target secondary pressure is a target value of the secondary pressure, and
• the actual secondary pressure is a detection value of the secondary pressure;
• and
• a line-pressure control section configured to perform a same-pressure control that equalizes a line pressure and the secondary pressure with each other if a predetermined start condition is satisfied,
• wherein the predetermined start condition includes an operating state where the secondary pressure is higher than a primary pressure which is supplied to the primary pulley,
• wherein the line-pressure control section is configured to
• realize a same-pressure state between the line pressure and the secondary pressure by lowering the line pressure below the target secondary pressure in the same-pressure control, and then
• control the line pressure by a command line pressure given such that the actual secondary pressure is brought to the target secondary pressure by the feedback control based on the difference between the target secondary pressure and the actual secondary pressure while maintaining the same-pressure state,
• wherein the secondary-pressure control section includes a restriction section configured to restrict an accumulation of integral term of the integral action for a duration between a time point at which the actual secondary pressure starts to be pushed down by the line-pressure control section and a time point at which the same-pressure state between the line pressure and the secondary pressure is realized.