Electric drive system and energy management method
First Claim
1. An electric drive system, comprising:
- an energy storage system (ESS), comprising;
a first energy storage unit; and
a second energy storage unit;
a power conversion system coupled to the ESS;
an alternating current (AC) traction system coupled to the power conversion system for converting electric power to mechanical torque, wherein the AC traction system comprises;
a first AC drive device for providing or receiving a first mechanical torque; and
a second AC drive device for providing or receiving a second mechanical torque;
a transmission device coupled to the first AC drive device for providing or receiving a third mechanical torque;
a power device coupled to the transmission device and the second AC drive device, the power device comprising one or more gears configured to;
combine the third mechanical torque and second mechanical torque into a fourth mechanical torque; and
output the fourth mechanical torque to a load; and
an energy management system (EMS) in communication with the ESS, the AC traction system, and the power conversion system for providing control signals.
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Accused Products
Abstract
An electric drive system includes an energy storage system (ESS), a power conversion system, and an alternating current (AC) traction system. The ESS provides or receives electric power. The ESS includes a first energy storage unit and a second energy storage unit. The power conversion system is electrically coupled to the ESS for converting an input power to an output power. The AC traction system is electrically coupled to the power conversion system for converting the output power of the power conversion system to mechanical torques. The AC traction system includes a first AC drive device and a second AC drive device. An energy management system (EMS) is in electrical communication with the ESS, the AC traction system, and the power conversion system for providing control signals.
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Citations
19 Claims
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1. An electric drive system, comprising:
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an energy storage system (ESS), comprising; a first energy storage unit; and a second energy storage unit; a power conversion system coupled to the ESS; an alternating current (AC) traction system coupled to the power conversion system for converting electric power to mechanical torque, wherein the AC traction system comprises; a first AC drive device for providing or receiving a first mechanical torque; and a second AC drive device for providing or receiving a second mechanical torque; a transmission device coupled to the first AC drive device for providing or receiving a third mechanical torque; a power device coupled to the transmission device and the second AC drive device, the power device comprising one or more gears configured to; combine the third mechanical torque and second mechanical torque into a fourth mechanical torque; and output the fourth mechanical torque to a load; and an energy management system (EMS) in communication with the ESS, the AC traction system, and the power conversion system for providing control signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An energy management method, comprising:
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enabling at least one of a first AC drive device and a second AC drive device based at least in part on an electric drive system speed signal; enabling an energy storage system (ESS) comprising at least one of a first energy storage unit and a second energy storage unit; and sending power control signals to a power conversion system for controlling power flow paths in an electric drive system, wherein controlling the power flow paths comprises; receiving or providing at least one input power by the power conversion system; and providing or receiving at least one output power by the power conversion system converting an electric power generated from the ESS into a first mechanical torque by the first AC drive device; splitting the first mechanical torque into a second mechanical torque and a third mechanical torque; providing the second mechanical torque to the second AC drive device for converting the second mechanical torque into electric power for charging the second energy storage unit; and providing the third mechanical torque to a load. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. An electric drive system, comprising:
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an energy storage system (ESS) comprising a plurality of energy storage units; a power conversion system coupled to the ESS; an alternating current (AC) traction system coupled to the power conversion system for converting electric power to mechanical torque, wherein the AC traction system comprises; a first AC drive device for providing or receiving a first mechanical torque; and a second AC drive device for providing or receiving a second mechanical torque; a power device coupled to the AC traction system configured for splitting the first mechanical torque into the second mechanical torque and a third mechanical torque; and an energy management system (EMS) in communication with the ESS, the AC traction system, and the power conversion system for providing control signals. - View Dependent Claims (19)
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Specification