SYSTEM AND METHOD FOR VEHICLE POWER MANAGEMENT
First Claim
1. A power management system for a vehicle having wheels and an electric machine operable to provide torque to drive at least one of the wheels, the power management system comprising:
- a first energy storage system capable of supplying power to operate the electric machine;
a second energy storage system capable of supplying power to at least one vehicle load at a lower voltage than the first energy storage system; and
a voltage conversion device operable to reduce a voltage of the power supplied by the first energy storage system to the lower voltage to charge the second energy storage system when the vehicle is in a key-off state.
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Accused Products
Abstract
A power management system for a vehicle having wheels and an electric machine operable to provide torque to drive at least one of the wheels includes a first energy storage system capable of supplying power to operate the electric machine. The system also includes a second energy storage system capable of supplying power directly to at least one vehicle load at a lower voltage than the first energy storage system. A voltage conversion device is operable to reduce a voltage of the power supplied by the first energy storage system to the lower voltage to charge the second energy storage system when the vehicle is in a key-off state.
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Citations
20 Claims
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1. A power management system for a vehicle having wheels and an electric machine operable to provide torque to drive at least one of the wheels, the power management system comprising:
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a first energy storage system capable of supplying power to operate the electric machine; a second energy storage system capable of supplying power to at least one vehicle load at a lower voltage than the first energy storage system; and a voltage conversion device operable to reduce a voltage of the power supplied by the first energy storage system to the lower voltage to charge the second energy storage system when the vehicle is in a key-off state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power management system for a vehicle having wheels and an electric machine operable to provide torque to drive at least one of the wheels, the power management system comprising:
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a high voltage battery for supplying power to operate the electric machine; a low-voltage battery for supplying power to at least one vehicle load; and a converter operable to reduce the voltage of power received from the high voltage battery and charge the low-voltage battery when the vehicle is in a key-off state. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method of power management for a vehicle having wheels and an electric machine operable to provide torque to drive at least one of the wheels, a high voltage battery for providing power to the electric machine, and a low-voltage battery, the method comprising:
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reducing voltage of the power from the high voltage battery during a vehicle key-off state; and charging the low-voltage battery with the reduced voltage power. - View Dependent Claims (17, 18, 19, 20)
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Specification