Shift control apparatus in vehicle automatic transmission

摘要

A shift control apparatus in a vehicle automatic transmission, where down-shift is carried out from a high velocity step to a low- velocity step. A flatness-aiming control has a common targetted change rate with respect to a turbine rotational speed in the inertia phase, and aims a hydraulic command value for the engaging side element and a hydraulic command value for the releasing side element at flatness in the inertia phase with the passage of time. An initial value setting control sets an engaging side initial value and a releasing side initial value at the beginning of the inertia phase in response to the turbine torque and the turbine rotational speed.