Patent ID: 9562588
Date: 2017-02-07
CPC Classifications: F16H

Claim:
1. A control apparatus for an automatic transmission which includes an input shaft to which a driving force generated by a drive source of a vehicle is transferred, a plurality of planetary gear mechanisms each including rotational elements having a sun gear, a carrier, and a ring gear, and a plurality of engagement mechanisms each configured to releasably connect two of the rotational elements of the plurality of planetary gear mechanisms or to releasably fix at least one of the rotational elements to a member on a fixed side, the automatic transmission being configured to achieve a plurality of gear change stages with different transmission gear ratios, the control apparatus comprising: a vehicle speed detector configured to detect a vehicle speed; and a controller configured to set one of the plurality of gear change stages according to a running condition of the vehicle and configured to select one of a plurality of engagement combination states of the plurality of engagement mechanisms to achieve at least one gear change stage out of the plurality of gear change stages in a case in which the controller sets the at least one gear change stage, the at least one gear change stage having the plurality of engagement combination states to achieve the at least one gear change stage, wherein the controller selects the one of the plurality of engagement combination states according to the vehicle speed detected by the vehicle speed detector, wherein the controller has a transmission characteristic that defines an area of gear change stage for the vehicle speed, the gear change stage being settable by the automatic transmission, and a condition of the vehicle speed for selecting one of the plurality of engagement combination states is defined such that the vehicle speed allows a skip gear change from the at least one gear change stage having the plurality of engagement combination states to a gear change stage which is at least two gear stages away to a lower gear in the transmission characteristic.