System and method for power management during regeneration mode in hybrid electric vehicles

A method of calculating regenerative braking power, comprising:

• calculating a predicted vehicle energy loss using a vehicle controller in a vehicle having a hybrid system that includes an electric motor generator, an internal combustion engine, and an energy storage system, the vehicle controller calculating the predicted vehicle energy loss using a current rate of deceleration of the vehicle;
• calculating a predicted electrical power supplied to the energy storage system using the vehicle controller, the vehicle controller calculating the predicted electrical power using the predicted vehicle energy loss;
• calculating a predicted electrical power loss using the vehicle controller, the vehicle controller calculating the electrical power loss using the predicted electrical power supplied to the energy storage system;
• calculating a predicted regenerative braking power using the vehicle controller, the vehicle controller calculating the predicted regenerative braking power using the predicted vehicle energy loss, the predicted electrical power supplied to the energy storage system, and the predicted electrical power loss;
• controlling the electric motor generator to generate a regenerative braking power using the controller, the electric motor operating in a generator mode to generate a regenerative braking power that is less than or equal to the predicted regenerative braking power.

A drive system for a hybrid vehicle comprising:

• an energy storage system;
• a vehicle drive train including an electric motor generator electrically connected to the energy storage system;
• a vehicle controller coupled to the energy storage system and the electric motor generator, the vehicle controller having a memory coupled to a processor, the processor configured to:
• detect a deceleration state of the hybrid vehicle;
• calculate a predicted vehicle kinetic energy change resulting from one or more vehicle energy losses;
• calculate a predicted electrical energy loss resulting from an expected transfer of a predicted electrical energy to the energy storage system;
• calculate an expected electric motor operating efficiency;
• calculate a predicted maximum electrical power deliverable into the energy storage system based on the predicted vehicle kinetic energy change, the predicted electrical energy loss, and the predicted motor operating efficiency;
• and
• operate the electric motor generator in an electric generator mode to generate a generated energy that is substantially equal to the predicted maximum electrical power.