| 摘要 |
PURPOSE:To preferably correct a fluctuation ratio by a learning control when a fastening pressure of a fricitonal element to be released at the time of transmission is decreased with a comparatively small set fluctiation ratio by means of feed-forward control before switching to feedback control. CONSTITUTION:When a releasing side pressure command value PRS is decreased rapidly as a value PRS1, an effective gear ratio g1 is largely raced during transmission based on a fastening side pressure command value PAS1, and transmission toruqe is led-in. When the releasing side pressure command value PRS is slowly decreased as a value PRS3, on the contrary, transmission waiting time T3 from an instant t1 to an instant t23 is elongated and transmission gets slow. A changing rate of the releasing side pressure command value PRS is decreased in the former case, increased in the latter case, and renewed as the value PRS2. Preferable transmission is always secured without being influenced by an operation oil temperature and causing deffectives described above. |
