Optimal selection of input torque considering battery utilization for a hybrid electric vehicle
First Claim
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1. Method for establishing a preferred operating point for a preselected powertrain operating parameter in a powertrain system having an energy storage system (ESS), comprising:
- determining a feasible operating space for the preselected powertrain operating parameter and within said operating space determining corresponding ESS power and system power loss;
determining a total system loss by applying an ESS power utilization cost as function of ESS power to the system power loss;
searching the feasible operating space for a value of the operating parameter corresponding to a minimum total system loss; and
establishing the preferred operating point as the value in the operating parameter corresponding to the minimum total system loss.
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Abstract
A preferred input torque for a hybrid powertrain is determined within a solution space of feasible input torques in accordance with a plurality of powertrain system constraints that results in a minimum overall powertrain system loss. System power losses and battery utilization costs are calculated at feasible input torques and a solution for the input torque corresponding to the minimum total powertrain system loss is converged upon to determine the preferred input torque.
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Citations
13 Claims
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1. Method for establishing a preferred operating point for a preselected powertrain operating parameter in a powertrain system having an energy storage system (ESS), comprising:
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determining a feasible operating space for the preselected powertrain operating parameter and within said operating space determining corresponding ESS power and system power loss; determining a total system loss by applying an ESS power utilization cost as function of ESS power to the system power loss; searching the feasible operating space for a value of the operating parameter corresponding to a minimum total system loss; and establishing the preferred operating point as the value in the operating parameter corresponding to the minimum total system loss. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Method for establishing a preferred operating point for a preselected powertrain operating parameter in a powertrain system having an energy storage system (ESS), comprising:
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determining a feasible operating space for the preselected powertrain operating parameter and within said operating space determining corresponding ESS power and system power loss; applying an ESS power utilization cost as function of ESS power to the system power loss to determine a total system loss; searching the feasible operating space for a value of the operating parameter corresponding to a minimum total system loss; and establishing the preferred operating point as the value in the operating parameter corresponding to the minimum total system loss; wherein applying an ESS power utilization cost as a function of ESS power to the system power loss to determine a total system loss, further comprises; determining a value of at least one ESS parameter; determining the ESS power utilization cost as a function of the at least one ESS parameter; and adding the ESS power utilization cost to the system power loss to determine the total system loss; wherein the at least one ESS parameter comprises a state of charge of the ESS and an amp-hour throughput of the ESS; wherein determining the ESS power utilization cost as a function of the at least one ESS parameter, further comprises; determining an ESS power utilization cost factor as a function of the state of charge and the amp-hour throughput; and multiplying ESS power by the ESS power utilization cost factor to determine the ESS power utilization cost. - View Dependent Claims (11, 12)
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13. Method for establishing a preferred operating point for a preselected powertrain operating parameter in a powertrain system having an energy storage system (ESS), comprising:
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determining a feasible operating space for the preselected powertrain operating parameter and within said operating space determining corresponding ESS power and system power loss; applying an ESS power utilization cost as function of ESS power to the system power loss to determine a total system loss; searching the feasible operating space for a value of the operating parameter corresponding to a minimum total system loss; and establishing the preferred operating point as the value in the operating parameter corresponding to the minimum total system loss; wherein said preferred operating point is periodically updated, and further wherein such periodic update proceeds during quiescent powertrain operation only when the value for the most recent search corresponds to a respective minimum total system loss that is at least a predetermined amount less than the respective minimum total system loss corresponding to the previously established preferred operating point.
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Specification