Vehicle propulsion system
First Claim
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1. A vehicle propulsion system comprising:
- an alternating current (AC) traction drive system;
a bi-directional boost converter comprising a high voltage side and a low voltage side, said bi-directional boost converter electrically coupled to said AC traction drive system;
a first energy storage system including a direct current (DC) link electrically coupling said first energy storage system to said AC traction drive system, said first energy storage system comprising at least one of a first ultracapacitor and a first high specific power battery coupled on said high voltage side;
a second energy storage system electrically coupled to said AC traction drive system such that a voltage output from said second energy storage system is decoupled from said DC link using said bi-directional boost converter;
an energy management system configured to control said first and second energy storage systems when a vehicle is operating in at least one of a pre-charge mode and a normal operation mode with said AC traction drive system enabled; and
a pre-charge circuit configured to at least partially charge said first ultracapacitor.
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Abstract
A vehicle propulsion includes an alternating current (AC) traction drive, a first energy storage system electrically coupled to the traction drive through a direct current (DC) link, a second energy storage system electrically coupled to the traction drive such that the voltage output from the second energy storage system is decoupled from the DC link using a bi-directional boost converter, and an energy management system configured to control said first and second energy storage systems when the vehicle is operating in at least one of a pre-charge mode and a normal operation mode with the traction drive system enabled.
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Citations
24 Claims
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1. A vehicle propulsion system comprising:
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an alternating current (AC) traction drive system; a bi-directional boost converter comprising a high voltage side and a low voltage side, said bi-directional boost converter electrically coupled to said AC traction drive system; a first energy storage system including a direct current (DC) link electrically coupling said first energy storage system to said AC traction drive system, said first energy storage system comprising at least one of a first ultracapacitor and a first high specific power battery coupled on said high voltage side; a second energy storage system electrically coupled to said AC traction drive system such that a voltage output from said second energy storage system is decoupled from said DC link using said bi-directional boost converter; an energy management system configured to control said first and second energy storage systems when a vehicle is operating in at least one of a pre-charge mode and a normal operation mode with said AC traction drive system enabled; and a pre-charge circuit configured to at least partially charge said first ultracapacitor. - View Dependent Claims (2, 3)
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4. A vehicle propulsion system comprising:
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an alternating current (AC) traction drive system; a bi-directional boost converter comprising a high voltage side and a low voltage side, said bi-directional boost converter electrically coupled to said AC traction drive system; a first energy storage system electrically coupled to said AC traction drive system through a direct current (DC) link; a second energy storage system electrically coupled to said AC traction drive system such that a voltage output from said second energy storage system is decoupled from said DC link using said bi-directional boost converter; a current sensor coupled to said DC link; and an energy management system configured to receive an output from said current sensor to control said first and second energy storage systems when a vehicle is operating in at least one of a pre-charge mode and a normal operation mode with said AC traction drive system enabled. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A vehicle propulsion system comprising:
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an alternating current (AC) traction drive system; a bi-directional boost converter comprising a high voltage side and a low voltage side, said bi-directional boost convertor electrically coupled to said AC traction drive system; a first energy storage system electrically coupled to said AC traction drive system through a direct current (DC) link; a second energy storage system electrically coupled to said AC traction drive system, a voltage output from said second energy storage system decoupled from said DC link using said bi-directional boost converter, said second energy storage system comprising at least one of an ultracapacitor and a high specific energy battery coupled on said low voltage side; and an energy management system configured to control said first and second energy storage systems when a vehicle is operating in at least one of a pre-charge mode and a normal operation mode with said AC traction drive system enabled, wherein said energy management system is programmed to generate a power command signal to control a relative power between said ultracapacitor and said high specific energy battery as a function of an operational mode of the vehicle, an ultracapacitor voltage and an ampere hour rating of said high specific energy battery. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A vehicle propulsion system comprising:
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an alternating current (AC) traction drive system; a bi-directional boost converter comprising a high voltage side and a low voltage side, said bi-directional boost converter electrically coupled to said AC traction drive system; a first energy storage system electrically coupled to said AC traction drive system through a direct current (DC) link; a second energy storage system electrically coupled to said AC traction drive system such that a voltage output from said second energy storage system is decoupled from said DC link using said bi-directional boost converter; an energy management system configured to control said first and second energy storage systems when a vehicle is operating in at least one of a pre-charge mode and a normal operation mode with said AC traction drive system enabled; and a DC-DC converter electrically coupled to a vehicle alternator rectifier output and a vehicle starting, lighting, and ignition battery providing a low-level charge of a high specific energy battery coupled on said low voltage side of said bi-directional boost converter with galvanic isolation provided between a vehicle chassis and a plurality of high-voltage traction electrical components.
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21. A vehicle propulsion system comprising:
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an alternating current (AC) traction drive system; a bi-directional boost converter comprising a high voltage side and a low voltage side, said bi-directional boost converter electrically coupled to said AC traction drive system; a first energy storage system electrically coupled to said AC traction drive system through a direct current (DC) link; a second energy storage system electrically coupled to said AC traction drive system such that a voltage output from said second energy storage system is decoupled from said DC link using said bi-directional boost converter; an energy management system configured to control said first and second energy storage systems when a vehicle is operating in at least one of a pre-charge mode and a normal operation mode with said AC traction drive system enabled; at least one cooling fan; and at least one temperature sensor, said energy management system configured to operate said at least one cooling fan based on an output from said at least one temperature sensor to facilitate cooling at least one of said first and second energy storage systems. - View Dependent Claims (22, 23, 24)
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Specification