Patent ID: 8190339
Filing Date: 2012-05-29
Classification: F16H

Abstract:
1. A shift control apparatus for an automatic transmission, the shift control apparatus comprising: a controller configured to control the automatic transmission; wherein the controller is configured to control a downshift from a higher shift speed to a lower shift speed, through an intermediate shift speed, by disconnecting and connecting respective pairs of the plurality of friction engagement elements at a single switching of the engagement; wherein the lower shift speed is spaced apart from the higher shift speed by two or more steps; wherein the pairs of the plurality of friction engagement elements comprise: wherein the controller is configured to control the downshift to the lower shift speed by, first, completely releasing the first shift release element and releasing the second shift release element so as to make the torque capacity of the second shift release element stand by at a pressure near an engagement starting pressure, then engaging the first shift engagement element so as to acquire a predetermined torque capacity, and then engaging the second shift engagement element at a predetermined rate without a halt, while controlling the torque capacity of the second shift release element by feedback control so as to control a rotation change rate of a rotation speed of the automatic transmission to become a target rotational acceleration.