| 摘要 |
PROBLEM TO BE SOLVED: To provide a control device of an automatic transmission which can secure a drive force of a vehicle by forming a prescribed low-gear stage even if an on-failure of a first solenoid valve occurs.SOLUTION: When an on-failure of a linear solenoid valve SL5 (or a linear solenoid valve SL3) occurs, the supply of engagement hydraulic pressure Pb1 (or Pc3) to a brake B1 (or a clutch C3) is blocked by a failsafe valve 59 by controlling the linear solenoid valve SL3 (or the linear solenoid valve SL5) during the output of an engagement command signal for forming a first speed gear stage [1st], the brake B1 (or the clutch C3) is not thereby engaged, and the first speed gear stage [1st] can be formed. Therefore, even if the on-failure of the linear solenoid valve SL5 (or the linear solenoid valve SL3) occurs, the first speed gear stage [1st] can be formed, and a drive force of a vehicle 10 can be secured.SELECTED DRAWING: Figure 6 |
