| 摘要 |
There is proposed a practical approach to a shift, in an automatic transmission, in which a release element is released and an apply element is engaged. The release element is released or vented at an appropriate timing after development of torque by the apply element but before initiation of inertia phase. Specifically, the release element is released when transmission output torque (To) reaches a value (Toh) calculated out of gear ratio after shift (grmin), transmission input (or turbine) torque (Tt) and transmission input (turbine) acceleration (NTd). If desired, without relying on measurement of output torque (To), the release element may be released when transmission output acceleration (No), namely, vehicle acceleration, reaches a value which may be fixed or accelerator position dependent. |
