Patent ID: 8392082
Filing Date: 2013-03-05
Classification: F16H

Abstract:
1. A control device for an automatic transmission having a torque converter, in which a target gear position is set on a basis of a vehicle speed and an engine load, comprising: a determining unit that determines whether to set a friction element that locks up the torque converter through oil pressure control in an engaged condition or a disengaged condition on a basis of at least a vehicle speed; a control unit that outputs an engagement command or a disengagement command on a basis of a determination result of the determining unit; and an oil pressure control unit that controls to engage the friction element upon reception of the engagement command by performing a precharge control that controls oil pressure to set the friction element before the engaged condition and then controlling supplied oil pressure to a predetermined oil pressure and to disengage the friction element upon reception of the disengagement command by draining the oil pressure supplied to the friction element, wherein the control unit comprises a prohibiting unit that prohibits output of the disengagement command in relation to the friction element following control of the friction element from the disengaged condition to the engaged condition until the precharge control is completed.