Optimal selection of input torque considering battery utilization for a hybrid electric vehicle
AssigneeGeneral Motors Corporation
InventorsWilliam R. Cawthorne, Anthony H. Heap, Gregory A. Hubbard
Life of this patent
Estimating the term…
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.
Claims13
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.
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;
- 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.
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;
- 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.
Dependencies are inferred from the claim text.