Method For Optimizing Powertrain Efficiency For A Vehicle
First Claim
1. A method for optimizing powertrain efficiency in a vehicle, the powertrain including an engine, an electric machine operable to output torque to at least one vehicle wheel, and an electrical power source operable to provide electrical power to the electric machine, the method comprising:
- generating a plurality of three-dimensional maps of optimized engine speeds for combinations of vehicle power and vehicle speed at a plurality of predetermined powers of the electrical power source, each of the maps corresponding to one of the predetermined powers of the electrical power source; and
using the maps to determine an optimized engine speed for a given power of the electrical power source, a given vehicle power and a given vehicle speed.
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Abstract
A vehicle powertrain includes an engine, an electric machine operable to output torque to at least one vehicle wheel, and an electric power source operable to provide electric power to the electric machine. A method for optimizing powertrain efficiency includes generating a plurality of three-dimensional maps of optimized engine speeds for combinations of vehicle power and vehicle speed at a plurality of predetermined powers of the electrical power source. Each of the maps corresponds to one of the predetermined powers of the electrical power source. The maps are used to determine an optimized engine speed for a given power of the electrical power source, a given vehicle power and a given vehicle speed.
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Citations
19 Claims
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1. A method for optimizing powertrain efficiency in a vehicle, the powertrain including an engine, an electric machine operable to output torque to at least one vehicle wheel, and an electrical power source operable to provide electrical power to the electric machine, the method comprising:
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generating a plurality of three-dimensional maps of optimized engine speeds for combinations of vehicle power and vehicle speed at a plurality of predetermined powers of the electrical power source, each of the maps corresponding to one of the predetermined powers of the electrical power source; and using the maps to determine an optimized engine speed for a given power of the electrical power source, a given vehicle power and a given vehicle speed. - View Dependent Claims (2, 3, 4, 5)
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6. A method for optimizing powertrain efficiency in a vehicle, the powertrain including an engine, an electric machine operable to output torque to at least one vehicle wheel, and an electrical power source operable to provide electrical power to the electric machine, the method comprising:
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determining a powertrain efficiency as a function of engine speed for one set of values of certain vehicle operating parameters, including a power of the electrical power source; maximizing the powertrain efficiency for the one set of values; and determining the optimized engine speed for the one set of values based on the maximized powertrain efficiencies. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A method for optimizing powertrain efficiency in a vehicle, the powertrain including an engine, an electric machine operable to output torque to at least one vehicle wheel, and an electrical power source operable to provide electrical power to the electric machine, the method comprising:
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inputting into a control system of the vehicle current values of a plurality of vehicle operating parameters, including a power of the electrical power source, the control system being programmed to output optimized engine speeds corresponding to respective values of the vehicle operating parameters; and outputting the optimized engine speed corresponding to the current values of the vehicle operating parameters. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification