Control device

A control device that is adapted for a vehicle drive system in which a first engagement device and a rotating electrical machine are provided in a power transfer path connecting an internal combustion engine to wheels and that performs start assist control for the internal combustion engine, the control device comprising:

• an electronic control unit that:
• executes, when the first engagement device is in a disengaged state, a first start assist process that brings the first engagement device into slip engagement at a first engagement pressure while increasing a torque generated by the rotating electrical machine;
• and
• executes, when the first start assist process fails to start the internal combustion engine, a second start assist process that increases an engagement pressure of the first engagement device to a second engagement pressure higher than the first engagement pressure while increasing the torque generated by the rotating electrical machine, wherein
• the second engagement pressure is determined on the basis of a rotational speed of the internal combustion engine in the first start assist process.

A control device that is adapted for a vehicle drive system in which a first engagement device, a rotating electrical machine, and a transmission are provided in a power transfer path connecting an internal combustion engine to wheels and that performs start assist control for the internal combustion engine, the control device comprising:

• an electronic control unit that:
• executes, when the first engagement device is in a disengaged state, a first start assist process that brings the first engagement device into slip engagement at a first engagement pressure while increasing a torque generated by the rotating electrical machine;
• and
• increases, when the first start assist process fails to start the internal combustion engine, an engagement pressure of the first engagement device toward a second engagement pressure higher than the first engagement pressure at a predetermined increasing gradient while increasing the torque generated by the rotating electrical machine, wherein
• the electronic control unit determines the increasing gradient on the basis of a gear ratio presently achieved by the transmission in such a manner that the increasing gradient becomes smaller as the gear ratio becomes larger.