| 摘要 |
PROBLEM TO BE SOLVED: To provide an automatic transmission control device having a low-cost simplified construction, capable of realizing variable speed during backward gear shift without almost increasing the number of part items. SOLUTION: Since a fail-safe valve 24 is moved to the left side except the time when a vehicle is put in first speed, a connecting path 191 and a connecting path 188 are connected to each other. At this time, a duty solenoid valve 28 can engage D/C7 by switching of a fail-safe valve 30. At the time of R range, the pressure of R/C1 becomes high, and R/C1 engages. Further, since the pressure of a connecting path 200 branched from a connecting path 122 becomes high, a line pressure is applied to LR/B5 through a high pressure selector valve 29, and LR/B5 engages. Reverse first speed is achieved by increasing the pressure Red/R6 by means of a duty solenoid valve 34, and at this time, D/C7 is released. Besides, by releasing Red/B6, D/C7 is engaged to realize reverse second speed. |
