CONTROL DEVICE OF AUTOMATIC TRANSMISSION

摘要

PROBLEM TO BE SOLVED: To prevent a shift shock by reducing a state changing speed of a frictional element more than the other shift stage at prescribed shift stage, and increasing the state changing speed of the frictional element when a change in an engine load is detected in shift operation. SOLUTION: A control unit 300 calculates prescribed calculating oil pressure after calculating feedback oil pressure by calculating base oil pressure as a substitute characteristic of input torque of an automatic transmission. The control unit 300 judges whether or not a turbine rotating speed is higher than a value by subtracting a first prescribed value from a prescribed target rotating speed. The control unit 300 outputs the duty ratio corresponding to calculating oil pressure to a second DSV 112 after setting a second lower limit value as a calculating oil pressure value when judging that the calculating oil pressure is lower than a second lower limit value. When judging that the calculating oil pressure is not lower than the second lower limit value, the duty ratio corresponding to the calculating oil pressure is outputted to the second DSV 112 to prevent the occurrence of a large shift shock.