Gangwechselsteuervorrichtung eines automatischen Getriebes und Verfahren davon

摘要

In an automatic transmission in which an input shaft torque of the automatic transmission is estimated from an engine torque and an oil pressure during a period of gear change is controlled corresponding to the input shaft torque, the estimation value of the input shaft torque is held to a value immediately before a gear change judgment until a period of time from the gear change judgment until a changing speed of an engine rotation speed exceeds a predetermined value, and when the changing speed exceeds the predetermined value, an estimation value of the engine torque is processed by a low pass filter having a time constant corresponding to the engine rotation speed, thereby the estimation value of the input shaft torque based on the estimation value of the engine torque passing through the low pass filter.