| 摘要 |
PURPOSE:To permit to reduce a shock upon changing a speed by a method wherein a learning control is intercepted and a correcting value, set based on a duty rate upon changing speed before switching, is adjusted upon the initial speed change. CONSTITUTION:A solenoid valve 54 is operated to supply a line pressure from an oil path 52 to a kickdown servo 36 through an oil path 38 to decide by the rotating speed of the kickdown drum 34 whether the synchronizing of first speed change step is released or not. When the synchronizing is released, a duty rate is operated again by a subtracting value assuming that the duty rate of an initial hydraulic pressure is too high and releasing of synchronizing is achieved. Accordingly, a good condition, in which the speed changing shock is not generated, may be obtained by feedback control. |
