Patent ID: 8678977
Filing Date: 2014-03-25
Classification: B60K,B60L,B60W,F16H,Y02T,Y10T

Abstract:
1. A control device for controlling a transmission device that includes an input member drivably coupled to a drive force source, an output member drivably coupled to wheels, and a speed change mechanism that has a plurality of friction engagement elements that are controllably engaged and disengaged to switch between a plurality of shift speeds, and that outputs rotation of the input member to the output member while changing a rotational speed with a speed ratio of each shift speed, wherein when the speed change mechanism performs switching to a shift speed with a different speed ratio, special speed change control is executed in which a disengagement hydraulic pressure, which is a hydraulic pressure of hydraulic oil for the disengagement element that is a friction engagement element to be disengaged, is lowered to cause a disengagement element to slip, and in which the disengagement element is maintained in a slipping state over an entire speed change process, which extends from a time point when the disengagement element starts slipping to a time point when a rotational speed obtained by multiplying a rotational speed of the output member by a speed ratio after the switching between shift speeds is synchronized with a rotational speed of the input member, and