Patent ID: 8744653

Claim:
A control apparatus for controlling a transmission apparatus that includes: an input member that is drivably connected to an engine and a rotating electrical machine being capable of generating regenerative torque based on a deceleration request of a vehicle; an output member that is drivably connected to wheels; and a speed change mechanism that has a plurality of friction engagement elements that are controlled to be engaged and released so as to switch a plurality of shift speeds, and that shifts a rotation speed of the input member at one of gear ratios set for the shift speeds and outputs the shifted speed to the output member, wherein when the speed change mechanism switches one of the shift speeds to another one of the shift speeds that has smaller one of the gear ratios in an accelerator pedal light depression position state where an accelerator pedal position of the vehicle is equal to or smaller than a prescribed value, the control apparatus reduces a release-side oil pressure, which is a pressure of hydraulic oil on a release-side element that serves as the friction engagement element to be released among the friction engagement elements so as to cause the release-side element to slip, and keeps the release-side element in such a slipping state where transfer of a driving force is carried out while the engagement members on both sides of the release-side element have a rotation speed difference and also keeps the release-side oil pressure at a magnitude that is equal to or greater than a stroke end pressure of a piston of the release side element so that the slipping state of the release-side element can be kept for an entire shifting phase independently of an output torque from the rotating electrical machine, the entire shifting phase begins at a time point when the release-side element starts to slip and ends at another time point when a rotation speed, which is obtained by multiplying a rotation speed of the output member by the gear ratio after the switching of the shift speeds, and the rotation speed of the input member synchronize with each other.