Control device

A control device that controls a vehicle drive device, the vehicle drive device including

• an input that is drivingly coupled to an internal combustion engine,
• an output that is drivingly coupled to wheels,
• a first rotating electrical machine,
• a second rotating electrical machine that is drivingly coupled to the output,
• a differential gear unit having three rotary elements, which are a first rotary element that is drivingly coupled to the first rotating electrical machine, a second rotary element that is drivingly coupled to the input, and a third rotary element that is drivingly coupled to the output,
• a fixing mechanism that is configured to switch between a fixing state where the first rotary element is held stationary with respect to a non-rotary member and a non-fixing state where the first rotary element is allowed to rotate, and
• a decoupling mechanism that is configured to switch between a transmitting state where power is transmitted between the second rotating electrical machine and the output and a non-transmitting state where power is not transmitted between the second rotating electrical machine and the output,
• wherein the control device switchably has
• a first drive mode which is attained with the fixing mechanism being in the non-fixing state and in which a rotational speed of the input is steplessly shifted and transmitted to the output and torque of the second rotating electrical machine is transmitted to the output,
• a second drive mode which is attained with the fixing mechanism being in the fixing state and the decoupling mechanism being in the non-transmitting state and in which, with the second rotating electrical machine being decoupled from the output, the rotational speed of the input is shifted according to a gear ratio of the differential gear unit and transmitted to the output, and
• a fourth drive mode which is attained with the fixing mechanism being in the fixing state and in which the rotational speed of the input is shifted according to the gear ratio of the differential gear unit and transmitted to the output and the torque of the second rotating electrical machine is transmitted to the output.

A control device that controls a vehicle drive device, the vehicle drive device including

• an input that is drivingly coupled to an internal combustion engine,
• an output that is drivingly coupled to wheels,
• a first rotating electrical machine,
• a second rotating electrical machine that is drivingly coupled to the output,
• a differential gear unit having three rotary elements, which are a first rotary element that is drivingly coupled to the first rotating electrical machine, a second rotary element that is drivingly coupled to the input, and a third rotary element that is drivingly coupled to the output,
• a fixing mechanism that is configured to switch between a fixing state where the first rotary element is held stationary with respect to a non-rotary member and a non-fixing state where the first rotary element is allowed to rotate, and
• a decoupling mechanism that is configured to switch between a transmitting state where power is transmitted between the second rotating electrical machine and the output and a non-transmitting state where power is not transmitted between the second rotating electrical machine and the output,
• wherein the control device switchably has
• a first drive mode which is attained with the fixing mechanism being in the non-fixing state and in which a rotational speed of the input is steplessly shifted and transmitted to the output and torque of the second rotating electrical machine is transmitted to the output, and
• a second drive mode which is attained with the fixing mechanism being in the fixing state and the decoupling mechanism being in the non-transmitting state and in which, with the second rotating electrical machine being decoupled from the output, the rotational speed of the input is shifted according to a gear ratio of the differential gear unit and transmitted to the output,
• the vehicle drive device further includes a direct coupling mechanism that is configured to switch between a direct coupling state where the three rotary elements of the differential gear unit are rotated together and a non-direct coupling state where the three rotary elements of the differential gear unit are allowed to have differential rotation, and
• the control device further switchably has
• a fifth drive mode which is attained with the direct coupling mechanism being in the direct coupling state and in which the rotational speed of the input is transmitted as it is to the output and the torque of the second rotating electrical machine is transmitted to the output, and
• a sixth drive mode which is attained with the direct coupling mechanism being in the direct coupling state and the decoupling mechanism being in the non-transmitting state and in which, with the second rotating electrical machine being decoupled from the output, the rotational speed of the input is transmitted as it is to the output.