Control apparatus for continuously-variable transmission of vehicle

A control apparatus for an automatic transmission of a vehicle, the control apparatus comprising:

• a primary pulley including a movable pulley, the primary pulley being connected with an input;
• a secondary pulley including a movable pulley, the secondary pulley being connected with an output;
• a belt wound around the primary pulley and the secondary pulley;
• a shift control valve configured to regulate a hydraulic pressure of a hydraulic fluid which varies a groove width of the movable pulley of the primary pulley, and to control a target pulley ratio between the primary pulley and the secondary pulley;
• a secondary pressure regulating valve configured to regulate a secondary pressure of a hydraulic fluid which varies a groove width of the movable pulley of the secondary pulley, and to regulate an engagement pressure between the belt and each of the primary pulley and the secondary pulley;
• an orifice disposed in an oil passage which is located between the movable pulley of the secondary pulley and the secondary pressure regulating valve, wherein the oil passage is connected to a feedback hydraulic passage, wherein the orifice is arranged to restrict a flow of the hydraulic fluid between the movable pulley of the secondary pulley and the secondary pressure regulation valve;
• a hydraulic pressure sensor disposed between the secondary pressure regulating valve and the orifice disposed in the oil passage, and configured to sense the secondary pressure;
• and
• a control section including a target secondary pressure setting section configured to set a target secondary pressure within a strength limit of the belt so as to prevent a slippage between the belt and each of the primary pulley and the secondary pulley, and an operation switching section configured to switch a shift operation from a normal speed to a high speed higher than the normal speed when a predetermined condition is satisfied, the control section being configured to control the secondary pressure regulating valve by a feedback control based on the target secondary pressure and the secondary pressure sensed by the hydraulic pressure sensor,
• wherein the target secondary pressure setting section is configured to modify the target secondary pressure by adding a predetermined quantity when a correction initiation condition is satisfied, the correction initiation condition including a first condition that the shift operation is performed at a high speed by switching of the operation switching section.