A system and method are disclosed for controlling a power split in a hybrid powertrain having an engine and a motor. According to at least one aspect of the present disclosure, the method includes selecting a displaced fuel consumption value for the engine based on a quantity of available reclaimed
A system and method are disclosed for controlling a power split in a hybrid powertrain having an engine and a motor. According to at least one aspect of the present disclosure, the method includes selecting a displaced fuel consumption value for the engine based on a quantity of available reclaimed energy in a battery, where the displaced fuel consumption value favors using the quantity of available reclaimed energy at relatively high load conditions, operating the engine at a condition based on the displaced fuel consumption value to generate engine power to meet at least a portion of a power demand, and operating the motor to generate motor power sufficient to supply a remaining power demand not met by the engine power. The system includes a controller configured to perform the operations of the method.
대표청구항▼
1. A method comprising: calculating a quantity of available reclaimed energy in a battery, the battery structured to power an electric motor, the motor connected to an internal combustion engine via a power splitter, wherein the battery, motor, engine, and power splitter comprise a hybrid powertrain
1. A method comprising: calculating a quantity of available reclaimed energy in a battery, the battery structured to power an electric motor, the motor connected to an internal combustion engine via a power splitter, wherein the battery, motor, engine, and power splitter comprise a hybrid powertrain structured to output power to meet a power demand;selecting a marginal displaced fuel consumption value for the engine based on incremental changes in the power contributions of the engine and the motor that is constrained by the quantity of available reclaimed energy in the battery, wherein the marginal displaced fuel consumption value is selected based on a desired marginal displaced fuel consumption contour line defining a region of displaced fuel consumption for the engine from an engine operating efficiency map in which losses shared with the motor are removed;interpreting the power demand from a demand input device in communication with the powertrain;operating the engine at a speed and load condition based on the marginal displaced fuel consumption value to generate engine power to meet at least a portion of the power demand;operating the motor to generate motor power sufficient to supply a remaining power demand not met by the engine power; andadjusting the engine power and/or the motor power in response to changes in power demand and/or available reclaimed energy. 2. The method of claim 1, wherein the marginal displaced fuel consumption value is selected to enable the battery to supply electrical power to the motor over an estimated duty cycle, such that a charge state of the battery does not drop below a prescribed lower limit nor rise above a prescribed upper limit. 3. The method of claim 1, wherein the quantity of available reclaimed energy is calculated from an estimated duty cycle, the estimated duty cycle including regeneration events. 4. The method of claim 1, wherein the quantity of available reclaimed energy is calculated from empirical data of operation of the powertrain, whereby the available reclaimed energy is adjusted during operation of the powertrain. 5. The method of claim 1, wherein the motor power is limited by the quantity of available reclaimed energy in the battery. 6. The method of claim 5, wherein the battery has a charge capacity and a charge level, and wherein the quantity of available reclaimed energy is limited such that the charge level of the battery is not less than a prescribed lower limit. 7. The method of claim 1, wherein the marginal displaced fuel consumption value is selected from a reference table including at least a portion of the operating range of the engine. 8. A method of controlling a hybrid powertrain, the method comprising: determining a quantity of regeneration energy in a battery, the battery structured to power an electric motor, the motor connected to an internal combustion engine via a power splitter, wherein the battery, motor, engine, and power splitter comprise a hybrid powertrain structured to power a load;determining a marginal displaced fuel consumption value for the hybrid powertrain based on incremental changes in the power contributions of the engine and the motor that is constrained by the quantity of regeneration energy, wherein the marginal displaced fuel consumption value is selected based on a desired marginal displaced fuel consumption contour line defining a region of displaced fuel consumption engine from an engine operating efficiency map in which losses shared with the motor are removed;selecting a threshold load condition for the engine that is based on the marginal displaced fuel consumption and the quantity of regeneration energy in the battery;interpreting a power demand from a demand input device in communication with the powertrain;operating the engine to generate engine power sufficient to meet the power demand not in excess of the threshold load condition;operating the motor to generate motor power sufficient to supply the remaining power demand not met by the engine power; andadjusting the engine power and the motor power in response to changes in power demand and/or regeneration energy. 9. The method of claim 8, wherein the threshold load condition favors the use of the regeneration energy at relatively high load power demand conditions, such that a charge state of the battery does not drop below a prescribed lower limit nor rise above a prescribed upper limit. 10. The method of claim 8, wherein the threshold load condition favors the use of engine power at relatively low load power demand conditions, such that a charge state of the battery does not drop below a prescribed lower limit nor rise above a prescribed upper limit. 11. The method of claim 8, wherein the threshold load condition is selected to maintain sufficient regeneration energy in the battery over an estimated duty cycle to enable the motor to meet the portion of the power demand above the threshold load condition not met by the engine power, such that a charge state of the battery does not drop below a prescribed lower limit nor rise above a prescribed upper limit. 12. The method of claim 8, wherein the quantity of regeneration energy is calculated from empirical data of operation of the powertrain. 13. The method of claim 8, wherein the quantity of regeneration energy is determined from an estimated duty cycle of the powertrain, the estimated duty cycle including regeneration events. 14. A method of controlling a hybrid powertrain, the method comprising: determining a quantity of regeneration energy in a battery having a capacity, the battery structured to power an electric motor, the motor connected to an internal combustion engine via a power splitter, wherein the battery, motor, engine, and power splitter comprise a hybrid powertrain structured to power a load;determining a marginal displaced fuel consumption value for the hybrid powertrain based on incremental changes in the power contributions of the engine and the motor that is constrained by the quantity of regeneration energy, wherein the marginal displaced fuel consumption value is selected based on a desired marginal displaced fuel consumption contour line defining a region of displaced fuel consumption for the engine from an engine operating efficiency map in which losses shared with the motor are removed;interpreting a power demand from a demand input device in communication with the powertrain;operating the motor to generate motor power based on the marginal displaced fuel consumption value that is sufficient to consume the quantity of regeneration energy at a rate, the rate selected to make available capacity in the battery for storage of additional regeneration energy;operating the engine to generate engine power sufficient to supply the remaining power demand not met by the motor power; andadjusting the engine power and the motor power in response to changes in power demand and/or regeneration energy. 15. The method of claim 14, wherein the method further comprises: determining a consumption factor, the consumption factor proportional to the marginal displaced fuel consumption of the powertrain; andincreasing the motor power by the consumption factor. 16. The method of claim 14, wherein the quantity of regeneration energy is determined from an estimated duty cycle of the powertrain, the estimated duty cycle including the powertrain regeneration events. 17. The method of claim 15, wherein the consumption factor favors the use of the quantity of regeneration energy at relatively high load conditions, such that a charge state of the battery does not drop below a prescribed lower limit nor rise above a prescribed upper limit. 18. A system for controlling a hybrid powertrain, the system comprising: a hybrid powertrain, the powertrain comprising: on internal combustion engine structured to generate engine power,an electrical motor, the motor structured to generate motor power and to selectively generate electrical power, the motor connected to the engine via a power splitter, anda battery, the battery connected to the motor and structured to store regeneration energy; anda controller in communication with the powertrain and structured to operate upon a torque or power demand to determine a power split between the engine and the motor, wherein the controller is configured to determine a marginal displaced fuel consumption value for the engine based on incremental changes in the power contributions of the engine and the motor that is constrained by a quantity of reclaimed energy in the battery, wherein the marginal displaced fuel consumption value is selected based on a desired marginal displaced fuel consumption contour line defining region of displaced fuel consumption for the engine from an engine operating efficiency map in which losses shared with the motor are removed, wherein the marginal displaced fuel consumption value favors using the quantity of available reclaimed energy at relatively high load conditions, to operate the engine at a speed and torque condition based on the marginal displaced fuel consumption value to meet at least a portion of the torque or power demand, and to operate the motor to generate sufficient motor power to supply a remaining torque or power demand not met by the engine power. 19. The system of claim 18, wherein the controller is further configured to adjust the engine power and/or the motor power in response to changes in the torque or power demand and the regeneration energy. 20. The system of claim 18, wherein the engine and the motor are arranged in a parallel configuration.
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