Hybrid powertrain

A hybrid powertrain comprising:

• an input member;
• an output member;
• a stationary member;
• an engine operatively connected with the input member;
• first and second electric motor/generators;
• only one differential gear set having a first, a second, and a third member;
• wherein the output member, the first motor/generator and the second motor/generator are each connected for common rotation with a different one of the members of the differential gear set;
• selectively engageable torque-transmitting mechanisms;
• wherein the input member, the output member, the engine and the motor/generators are selectively interconnected through the differential gear set by engagement of the torque-transmitting mechanisms in different combinations;
• wherein the electric motor/generators and the torque-transmitting mechanisms are controllable to provide multiple operating modes between the input member and the output member, including:
• a first electric-only operating mode in which the engine is off, one of the first and second electric motor/generators acts as a motor to provide torque at the output member while the other of the first and second electric motor/generators is able to remain off;
• and
• a second electric-only operating mode in which the engine is off and both first and second electric motor/generators act as motors to provide torque at the output member;
• wherein one of the torque-transmitting mechanisms is selectively engageable to connect the engine for common rotation with the first electric motor/generator;
• wherein a different one of the torque-transmitting mechanisms is selectively engageable to connect the engine for common rotation with the second electric motor/generator;
• wherein another different one of the torque-transmitting mechanisms is selectively engageable to ground the first member to the stationary member;
• and wherein still another different one of the torque-transmitting mechanisms is selectively engageable to ground the second member to the stationary member.

A hybrid powertrain including:

• an engine operatively connected to an input member;
• an output member;
• a differential gear set having a first, a second, and a third member;
• a first and a second electric motor/generator;
• selectively-engageable torque-transmitting mechanisms,
• wherein the electric motor/generators and the torque-transmitting mechanisms are controllable to provide multiple operating modes between the input member and the output member, including:
• a first electric-only operating mode in which the first electric motor/generator provides torque to the output member while the engine and the second electric motor/generator are off;
• a second electric-only operating mode in which the second electric motor/generator provides torque to the output member while the engine and the first electric motor/generator are off;
• a first electrically-variable operating mode in which the input member and the first electric motor/generator are connected for common rotation with the first member of the differential gear set, the second electric motor/generator is connected for common rotation with the second member of the differential gear set, and the third member of the differential gear set is connected for common rotation with the output member;
• and
• a second electrically-variable operating mode in which the input member and the second electric motor/generator are connected for common rotation with the second member of the differential gear set, the first electric/motor generator is connected for common rotation with the first member of the differential gear set, and the third member of the differential gear set is connected for common rotation with the output member.