Method and apparatus for management of an electric energy storage device to achieve a target life objective
First Claim
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1. Method for controlling an electrical energy storage device that is in service within a vehicle, comprising:
- providing a present state-of-life of the electrical energy storage device;
establishing a target life objective for the electrical energy storage device as one of cumulative time and distance that the electrical energy storage device is in service within the vehicle at a predetermined state-of-life of the electrical energy storage device;
determining a state-of-life gradient as a rate of change in the state-of-life of the electrical energy storage device with respect to the one of cumulative time and distance that the electrical energy storage device is in service within the vehicle which linearly converges the present state-of-life of the electrical energy storage device to the target life objective; and
,controlling electrical energy storage device power to effect the state-of-life gradient.
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Abstract
A method for determining a preferred operating gradient for use in attaining a life objective for an electrical energy storage device is disclosed. A present state-of-life of the electrical energy storage device is provided and a life target for the electrical energy storage device is established as a predetermined limit in a predetermined metric at a predetermined state-of-life of the electrical energy storage device. A state-of-life gradient is then determined with respect to the predetermined metric which converges the state-of-life of the electrical energy storage device to the life target.
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12 Claims
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1. Method for controlling an electrical energy storage device that is in service within a vehicle, comprising:
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providing a present state-of-life of the electrical energy storage device; establishing a target life objective for the electrical energy storage device as one of cumulative time and distance that the electrical energy storage device is in service within the vehicle at a predetermined state-of-life of the electrical energy storage device; determining a state-of-life gradient as a rate of change in the state-of-life of the electrical energy storage device with respect to the one of cumulative time and distance that the electrical energy storage device is in service within the vehicle which linearly converges the present state-of-life of the electrical energy storage device to the target life objective; and
,controlling electrical energy storage device power to effect the state-of-life gradient. - View Dependent Claims (2, 3)
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4. Method for managing state-of-life of an electrical energy storage device that is in service within a vehicle, comprising:
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providing a state-of-life gradient based on a present state-of-life of the electrical energy storage device and a target life objective comprising at least one of cumulative time and distance that the electrical energy storage device is in service within the vehicle at a predetermined state-of-life of the electrical energy storage device; and controlling electrical energy storage device power such that electrical energy storage device state-of-life substantially tracks the state-of-life gradient comprising linearly converging the present state-of-life of the electrical energy storage device to the target life objective. - View Dependent Claims (5)
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6. Method for managing an operating state of an electrical energy storage device, comprising:
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establishing a target life objective for the electrical energy storage device comprising a predetermined service life for the electrical energy storage device, and controlling power transmitted through the electrical energy storage device such that the operating state of the electrical energy storage device is less than a predetermined value when the target life objective is attained comprising linearly converging a present operating state of the electrical energy storage device to the target life objective. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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Specification