| 摘要 |
PURPOSE:To securely prevent the occurrence of shock, in an automatic transmission equipped with a main transmission and an auxiliary transmission, at the time of completion of the simultaneous speed change of these two transmissions. CONSTITUTION:An automatic transmission AT is equipped with a main transmission 3 and an auxiliary transmission 4. In the 2-3 upshift, the brake 35 of the main transmission 3 is connected, and the clutch 47 of the auxiliary transmission 4 is released. In this 2-3 upshift, the speed change of the auxiliary transmission 4 is completed prior to that of the main transmission 3, and then the oil pressure of the clutch 47 is quickly drained, and at the same time the oil pressure of the brake 35 is drained. The time interval DELTAt to be required for the quick draining of the auxiliary transmission 4 is mapped on the basis of the oil temperature, and the draining velocity of the brake 35 is regulated in accordance with the length of this time interval DELTAt. |
