| 摘要 |
PURPOSE:To reduce shift shock at a gear change final term by continuing feed back control in the way same as in a period of an effective gear change even if effective gear change is completed, and controlling oil pressure of the high speed step abrasion engaging element of an opening side so as to set the change rate of rotating speed of a rotary element to a set value. CONSTITUTION:In the transmission mechanism 1 having a forward 5 steps and backward 1 step, oil pressure of various kinds of a brake and a clutch is intake and exhaust-controlled so as to establish a prescribed gear change step. In this case, gear change is carried out from 4 step speed to 3 step speed, oil pressure of a 4 step speed and 5 step speed clutch is feed back-controlled so as to set a rotary speed change rate to be a setting change rate during an effective gear change period from an effective gear change starting time when turbine rotary speed of a torque converter 13 is shifted from rotary speed corresponding to 4 step speed, to an effective gear change completing time which exceeds rotary speed corresponding to 3 step speed. Prescribed period feed back control times by a timer at the effective gear change completing time is continued. |
