Vehicle drive system, power management device, and method for managing power

A power distribution system for a hybrid vehicle having an engine, the power distribution system comprising:

• an electric motor/generator;
• a vehicle accessory drive system comprising a first accessory;
• and
• a power distribution apparatus in operable communication with the engine, the electric motor/generator, and the vehicle accessory drive system, the power distribution apparatus comprising:
• a first power transfer member comprising a first shaft, the first shaft being configured to transfer power to the engine and from the engine;
• a second power transfer member comprising a second shaft, the second shaft being configured to transfer power to the motor/generator and from the motor/generator;
• a third power transfer member comprising a third shaft, the third shaft being configured to transfer power to the accessory drive system to drive the first accessory;
• and
• a first clutch configured to rotationally couple any two of the first shaft, the second shaft, and the third shaft;
• a second clutch configured to prevent power from being transferred from the power distribution apparatus to the engine in a first direction;
• wherein the electric motor/generator, the engine, or a combination of the electric motor/generator and the engine, can supply power through the power distribution apparatus to the accessory drive system, and
• wherein the third shaft of the power distribution apparatus is configured to operate at a predetermined velocity, wherein the predetermined velocity is independent of the engine velocity.