Method to adjust battery minimum state of charge limits based on battery power capability
First Claim
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1. A vehicle comprising:
- a traction battery; and
at least one controller programmed to operate the traction battery according to a minimum state of charge that is based on an electrical resistance and a predetermined minimum power for engine cranking such that the predetermined minimum power is available at the minimum state of charge, wherein below the minimum state of charge no power is requested from the traction battery for propulsion.
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Abstract
A hybrid-electric vehicle includes a traction battery. A controller may operate the traction battery within certain state of charge and voltage limits. The controller may define a minimum operating voltage or state of charge below which no power may be requested from the traction battery. The minimum voltage and state of charge may be based on an electrical resistance of the traction battery. The voltage may also be based on a minimum power level required to crank the engine while meeting emissions standards. As the battery ages, the minimum voltage level may be adjusted such that the minimum power level is available at the minimum voltage level.
12 Citations
20 Claims
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1. A vehicle comprising:
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a traction battery; and at least one controller programmed to operate the traction battery according to a minimum state of charge that is based on an electrical resistance and a predetermined minimum power for engine cranking such that the predetermined minimum power is available at the minimum state of charge, wherein below the minimum state of charge no power is requested from the traction battery for propulsion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A controller-implemented method comprising:
operating, by a controller, a traction battery according to a minimum state of charge that is based on a resistance of the traction battery and a minimum power capability for engine cranking such that a predetermined minimum power is available at the minimum state of charge, wherein no power is requested from the traction battery for propulsion when a state of charge is below the minimum state of charge. - View Dependent Claims (10, 11, 12)
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13. A vehicle comprising:
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a traction battery; and at least one controller programmed to operate the traction battery according to a minimum voltage that is based on an electrical resistance and a predetermined power for engine cranking such that the predetermined power is available at the minimum voltage, wherein no power is requested from the traction battery for propulsion when a voltage of the traction battery is less than the minimum voltage. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification