Patent ID: 7621844

Claim:
A shift control device for a vehicle transmission having a plurality of gear ranges grouped into first and second gear groups, a first clutch configured and arranged to be engaged when one of the gear ranges in the first gear group is selected, and a second clutch configured and arranged to be engaged when one of the gear ranges in the second gear group is selected, the shift control device comprising: a rotational speed detecting section configured and arranged to detect a current rotational speed of a drive source of a vehicle; a deceleration detecting section configured and arranged to detect a deceleration rate of the vehicle; a rotational speed estimating section configured to determine an estimated rotational speed of the drive source after downshifting based on the current rotational speed and the deceleration rate; a gear determining section configured to determine a next gear range to be used from one of the first and second gear groups corresponding to one of the first and second clutches that is being released; and a pre-shifting section configured to control the vehicle transmission to achieve a waiting state before switching engagement states of the first and second clutches to obtain the next gear range when the next gear range is on a downshift side of a current gear range and the estimated rotational speed is determined to be lower than a first prescribed rotational speed.