| 摘要 |
PROBLEM TO BE SOLVED: To rationalize the engaging pressure of each frictional engaging element for retaining a predetermined number of speeds, by identifying hydraulic pressure supplied to each hydraulic servo when the predetermined shift stage is achieved, as necessary engaging hydraulic pressure calculated per frictional engaging element. SOLUTION: Hydraulic pressure according to an input torque is calculated and can be supplied per each of frictional engaging elements B-1 to B-3 during a constant period, holding hydraulic pressure due to the sharing of the torque of the frictional engaging elements B-1 to B-3 and the change of a throttle opening can be supplied during shift period, and hydraulic pressure can be supplied during a garage shifting period by calculating the holding hydraulic pressure that the strolling state of a torque converter 12 is supposed, therefore more than necessary increase of surface pressure when the frictional members of the frictional engaging elements B-1 to B-3 are engaged with each other, can be suppressed. Hereby, a repeating stress load due to engagement and disengagement can be reduced. |
