Hydraulic pressure control apparatus and method for continuously variable transmission

A hydraulic control apparatus for a continuously variable transmission, comprising:

• a line pressure control valve configured to develop a line pressure of the continuously variable transmission with a working oil supplied from an oil pump as an original pressure;
• and
• a line pressure controlling section configured to set a command pressure to develop a line pressure target value in such a manner that the command pressure is maintained at a predetermined small value for a constant time and, thereafter, the value of the command pressure is raised up to the target value when a shift range is switched from a neutral range to a running range, the line pressure controlling section raising the command pressure at a rate lower than a step input to suppress an overshoot developed in the actual line pressure.

A hydraulic pressure control method for a continuously variable transmission, comprising:

• developing a line pressure of the continuously variable transmission with a working oil supplied from an oil pump as an original pressure;
• and setting a command pressure to develop a line pressure target value of the target value in such a manner that the command pressure is maintained at a predetermined small value for a constant time and, thereafter, the value of the command pressure is raised up to the target value when a shift range of the continuously variable transmission is switched from a neutral range to a running range, the command pressure being raised at a rate lower than a step input to suppress an overshoot developed in the actual line pressure.