| 摘要 |
PURPOSE:To high accurately control operation of a liquid pressure actuator by correcting a pressure value of supply pressure liquid in accordance with duty ratio to obtain a correction value and deciding an actuator rod to reach a predetermined stroke when an integrated pressure value of this correction pressure value reaches a predetermined value. CONSTITUTION:In an ECU65, a friction engaging element 30 is actuated through an actuator rod 79, associated with a piston 59, by generating a pressure to rise up by supplying pressure liquid, whose pressure value is controlled by duty-controlling a solenoid valve 67, to a pressure chamber 81 regulated by the piston 59 in a liquid pressure actuator 31. A switch 93 is on-operated, when the rod 79 is moved by a predetermined distance, to obtain a correction pressure value by correcting the pressure value of pressure liquid, supplied to the pressure chamber 81 from on-operation of the switch 93, in accordance with a level of duty ratio of the pressure value, and supply of the pressure liquid to the pressure chamber 81 is controlled by deciding a stroke amount of the actuator rod 79 to reach a predetermined stroke, corresponding to desired operation of the friction engaging element 30, when an integrated pressure value, obtained by integrating this correction pressure value, reaches a predetermined value. |
