| 摘要 |
PROBLEM TO BE SOLVED: To increase turbine rotational speed in a good condition following with a target till rotational speed after changing speed by calculating and learning correcting a correction rate of an operating pressure initial value so as to make a time between a feed back control start time and a time when an input rotational speed changing ratio exceeds a prescribed value or more, at the time of down shift speed changing. SOLUTION: When speed is changed from 4 to 3, when a prescribed delay time T1 is lapsed after a shift command is outputted, servo apply pressure is reduced from a maximum value to a prescribed base oil pressure Pb. After that, when a condition in which a prescribed time T3 is lapsed and the like is set up, feed back control is carried out on the basis of the base oil pressure Pb. Learning correction control of the base oil pressure Pb is carried out so as to set a time T4 between a feed back control start time and a start time of a turbine rotational speed Nt to a proper time. It is thus possible to prevent turbine rotational speed from over-shooting after speed is changed since the base oil pressure Pb is excessively low, and it is also possible to prevent speed changing from carrying out for a long time since the base oil pressure Pb is excessively high. |
