Patent ID: 8280597

Claim:
A control apparatus of an automatic transmission comprising: an engagement part which is engaged by increasing a capacity of the engagement part and is disengaged by reducing the capacity of the engagement part; a power-ON/OFF state judgment section which judges power-ON/OFF states; and a control section which controls the capacity of the engagement part so as to calculate and achieve a target input revolution speed of the engagement part at least according to the power-ON/OFF states, and the control section being configured (a) to compare an actual input revolution speed difference absolute value that is defined as an absolute value of a difference between an input revolution speed of the engagement part when engaged and an actual input revolution speed of the engagement part with a target input revolution speed difference absolute value that is defined as an absolute value of a difference between the input revolution speed of the engagement part when engaged and the target input revolution speed of the engagement part; and (b) to increase the capacity of the engagement part when the actual input revolution speed difference absolute value is greater than the target input revolution speed difference absolute value; (c) to reduce the capacity of the engagement part when the actual input revolution speed difference absolute value is less than the target input revolution speed difference absolute value; and (d) to maintain a previous capacity of the engagement part which is set before the comparison of the both actual input and target input revolution speed difference absolute values when the actual input revolution speed difference absolute value is equal to the target input revolution speed difference absolute value.