| 摘要 |
PURPOSE:To provide a sure effect by controlling the change of line pressure and also minimizing the bad influence brought about in an automatic transmission which controls the change of line pressure when changing speed. CONSTITUTION:In a hydraulic control circuit which achieves the speed change from 1 to 2 with a 2-4 brake applied by supplying the servo apply pressure that takes the line pressure supplied through a main line 100 and the first output line 101 as source pressure to the apply port 45b of the 2-4 brake through a servo apply line 110, a line pressure changing command is output at the same time when speed changing is commanded. Only while the temperature of hydraulic fluid is low, line pressure is relatively low, throttle opening degree is small, and cut back control is conducted, the timing of the switching of a 1-2 shift valve 53 for carrying out a speed change is made to delay for a specified time. |
