Apparatus for and method of controlling power train, and storage medium storing program for implementing the method

摘要

An ECU executes a program for implementing a method that includes: a step of performing control so that torque capacity Tch of a frictional engagement device that is brought from an engaged state into a disengage state by a downshift operation is gradually reduced to start an inertia phase when a power-on downshift is performed; and a step of stopping the gradual reduction of the torque capacity Tch when the rate of change in an input shaft rotation speed NI of an automatic transmission has reached a desired rate of change &Dgr;N(1). Variation in output torque is kept small, and the shock that can occur at the time of a shift is thus reduced.