Method of operating propulsion system
First Claim
1. A method, comprising:
- propelling an electrically driven vehicle at a first, slower speed and high torque by supplying electricity at a first, lower voltage from a first energy storage device to a second electric motor; and
propelling the vehicle at a second, faster speed and moderate torque by supplying electricity at a second, higher voltage from an engine-driven generator to a first electric motor, wherein the first electric motor is not coupled to the first energy storage device.
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Accused Products
Abstract
A method is provided that includes propelling an electrically driven vehicle at a first, slower speed, and potentially high torque by supplying electricity at a first, lower voltage from an energy storage device to a second electric motor; and includes propelling the vehicle at a second, faster speed, and moderate torque by supplying electricity at a second, higher voltage from an engine-driven generator to a first electric motor. Another method includes propelling an electrically driven vehicle by supplying electricity from an engine-driven generator to a first electric motor; and generating electricity at a second electric motor to charge an energy storage device. Corresponding systems for implementing the method are provided.
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Citations
22 Claims
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1. A method, comprising:
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propelling an electrically driven vehicle at a first, slower speed and high torque by supplying electricity at a first, lower voltage from a first energy storage device to a second electric motor; and propelling the vehicle at a second, faster speed and moderate torque by supplying electricity at a second, higher voltage from an engine-driven generator to a first electric motor, wherein the first electric motor is not coupled to the first energy storage device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method, comprising:
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propelling an electrically driven vehicle by supplying electricity from an engine-driven generator to a first electric motor; and generating electricity at a second electric motor to charge an energy storage device without regenerative braking by applying a torque command to the first electric motor that is opposite polarity to a torque command supplied to the second electric motor. - View Dependent Claims (11, 12)
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13. A method, comprising:
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monitoring for component failure in a second traction drive system in a vehicle having at least a first traction drive system and the second traction drive system, wherein the first traction drive system comprises a first electric motor and the second traction drive system comprises a second electric motor coupled to a first energy storage device; and responding to a component failure indication of the first traction drive system by; routing energy to and from the first electric motor to a second energy storage device, or routing energy to and from the first energy storage device to the second electric motor. - View Dependent Claims (14, 15)
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16. A method, comprising:
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initiating a braking event calling for an amount of a required braking power for a vehicle having an electric motor that can drive a wheel, and having an energy storage device, an electric converter, and a power switch coupled to the electric motor; determining a first available braking power based on a component limiting factor determined by at least one of; power capacity of the electric motor, torque capacity of the electric motor, maximum adhesion limit of the wheel on a wheel-bearing surface, electrical uptake capacity of the energy storage device, electrical rating capacity of the electronic converter, or electrical rating capacity of the power switch; and comparing the first available braking power to the required braking power; meeting the required braking power first with the first available braking power; and supplementing the first available braking power with a second available braking power where the first available braking power is insufficient to meet the required braking power, and the second available braking power is based on at least a capacity of a dynamic braking grid resistor array coupled thereto. - View Dependent Claims (17, 18, 19)
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20. A system, comprising:
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means for propelling an electrically driven vehicle at a first, slower speed and high torque by supplying electricity at a first, lower voltage from a first energy storage device to a second electric motor; and means for propelling the vehicle at a second, faster speed and moderate torque by supplying electricity at a second, higher voltage from an engine-driven generator to a first electric motor, wherein the first electric motor is not coupled to the first energy storage device.
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21. A system, comprising:
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means for propelling an electrically driven vehicle by supplying electricity from an engine-driven generator to a first electric motor; and means for generating electricity at a second electric motor to charge an energy storage device without regenerative braking by applying a torque command to the first electric motor that is opposite polarity to a torque command supplied to the second electric motor.
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22. A system, comprising:
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means for initiating a braking event calling for an amount of a required braking power for a vehicle having an electric motor that can drive a wheel, and having an energy storage device, an electric converter, and a power switch coupled to the electric motor; means for determining a first available braking power based on a component limiting factor determined by at least one of; power capacity of the electric motor, torque capacity of the electric motor, maximum adhesion limit of the wheel on a wheel-bearing surface, electrical uptake capacity of the energy storage device, electrical rating capacity of the electronic converter, or electrical rating capacity of the power switch; and means for comparing the first available braking power to the required braking power; means for meeting the required braking power first with the first available braking power; and means for supplementing the first available braking power with a second available braking power where the first available braking power is insufficient to meet the required braking power, and the second available braking power is based on at least a capacity of a dynamic braking grid resistor array coupled thereto.
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Specification