IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0657515
(2012-10-22)
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등록번호 |
US-8457860
(2013-06-04)
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발명자
/ 주소 |
- Matuszeski, Thaddeus Benjamin
- Koch, Rolland Mitchell
- Berman, Scott Garret
- Abdulrahim, Mujahid
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
4 |
초록
▼
An electric power management system of a vehicle may interconnect a power plant, a propeller drive unit, and a battery via a bus. A command limiting controller may direct the operation of the power plant and the propeller drive unit in fast and slow modes of operation, the fast mode of operation ope
An electric power management system of a vehicle may interconnect a power plant, a propeller drive unit, and a battery via a bus. A command limiting controller may direct the operation of the power plant and the propeller drive unit in fast and slow modes of operation, the fast mode of operation operating at a higher bus voltage than at a slow mode of operation. The command limiting controller may generate a bus current to drive the propeller drive unit according to a command limiting, voltage-versus-current curve that adjusts the bus current depending on an amount of voltage on the power bus; where the command limiting curve includes a minimum voltage portion, a maximum voltage portion and a control range therebetween having upper and lower voltage limits and upper and lower current limits for enhanced reliability and stable control of the propeller drive unit.
대표청구항
▼
1. An electric power management system for a vehicle, the electric power management system comprising: a power plant configured to generate electrical power and to supply a voltage to a power bus;a battery connected with the power bus to also supply voltage to the power bus;a propeller drive unit co
1. An electric power management system for a vehicle, the electric power management system comprising: a power plant configured to generate electrical power and to supply a voltage to a power bus;a battery connected with the power bus to also supply voltage to the power bus;a propeller drive unit connected with the power bus, and drawing power from the power plant and the battery via the power bus to cause movement of the vehicle at different speeds depending on a mode of operation comprising fast and slow modes of operation, where the fast mode results in a higher power bus voltage than the slow mode, the higher power bus voltage coming from additional voltage supplied by the battery; anda command limiting controller configured to generate a bus current to drive the propeller drive unit according to a command limiting, voltage-versus-current curve that adjusts the bus current depending on an amount of voltage on the power bus;where the command limiting curve includes a minimum voltage portion, a maximum voltage portion and a control range therebetween having upper and lower voltage limits and upper and lower current limits for enhanced reliability and stable control of the propeller drive unit. 2. The power management system of claim 1, where in the slow mode, the flow of power is substantially only from the power plant and into the propeller drive unit and the battery; and in the fast mode, the flow of power is from the battery and the power plant and into the propeller drive unit, and an increase in propeller drive unit speed that is requested is initially powered generally entirely by the battery, such that in the fast mode, the propeller drive unit speed is not limited by a present level of power being generated by the power plant. 3. The power management system of claim 1, where the command limiting controller limits the bus current a majority of time to remain within the control range of the command limiting curve. 4. The power management system of claim 1, further comprising: a guidance navigation and control system connected with the command limiting controller, where the command limiting controller is further configured to limit a command for power from the guidance navigation and control system so that the bus current stays substantially within the control range of the command limiting curve. 5. The power management system of claim 1, where the battery is configured to be charged by current generated by the power plant via the power bus; and where in the fast mode the command limiting controller limits the bus voltage about a set point and the upper and lower voltage limits set battery charge and discharge rates. 6. The power management system of claim 1, where in the slow mode, the command limiting controller is further configured to limit bus voltage to changing in smaller increments about a set point than increments allowed in the fast mode, and the upper and lower voltage limits prevent significant battery use. 7. The power management system of claim 1, where the command limiting curve comprises a constant voltage gain, the minimum voltage portion comprises a low voltage gain and the maximum voltage portion comprises a high voltage gain. 8. A power management system for a vehicle, comprising: a power plant configured to generate electrical power and to supply a voltage to a power bus;a battery connected with the power bus to also supply voltage to the power bus;a propeller drive unit connected with the power bus, and drawing power from the power plant and the battery via the power bus to cause movement of the vehicle at different speeds depending on a mode of operation comprising fast and slow modes of operation, where the fast mode results in a higher power bus voltage than the slow mode, the higher power bus voltage coming from additional voltage supplied by the battery; anda current regulator configured to generate a command current to power the propeller drive unit according to a control graph, the current regulator configured to: set upper and lower bus voltage thresholds within which the bus voltage is regulated based on the control graph;generate a conditioned bus voltage by adjusting the bus voltage by a function based on current settings;summing the conditioned bus voltage with the bus current; andsending the summed conditioned bus voltage and bus current through a proportional integrator to limit the generated command current. 9. The power management system of claim 8, where the current regulator is further configured to send a maximum current limit signal into the proportional integrator. 10. The power management system of claim 9, where the maximum current limit signal is generated with logic receiving as inputs to the logic: a maximum current signal; a maximum speed and an actual speed; and a minimum bus voltage signal and a bus voltage signal. 11. The power management system of claim 8, where the current regulator is further configured to send a minimum current limit signal into the proportional integrator. 12. The power management system of claim 11, where the minimum current limit signal is generated with logic receiving as inputs to the logic: a minimum current signal; a minimum speed and an actual speed; and a maximum bus voltage signal and a bus voltage signal. 13. The power management system of claim 8, where in the slow mode, the flow of power is substantially only from the power plant and into the propeller drive unit and the battery; and in the fast mode, the flow of power is from the battery and the power plant and into the propeller drive unit, and an increase in propeller drive unit speed that is requested is initially powered generally entirely by the battery, such that in the fast mode, the propeller drive unit speed is not limited by a present level of power being generated by the power plant. 14. The power management system of claim 8, where the current regulator further limits the conditioned bus voltage with maximum and minimum current limits on the bus current. 15. A method of electric power management, the method comprising: generating electric power from a power plant located on a vehicle, the power plant being connected with a bus and supplying a voltage to the bus;generating additional electric power from a battery connected with the bus, the battery supplying additional voltage to the bus in at least one mode of operation;powering a propeller drive unit of a vehicle in a mode of operation from a voltage placed onto the bus by the power plant and the battery, the mode of operation depending on a requested propeller speed;retrieving a bus current command request in response to a request for a change in propeller speed;limiting, by a bus current regulator connected with the bus, a bus current within a maximum and minimum current;calculating, by the bus current regulator, an adjustment to the bus current based on the bus voltage;filtering the bus current; andlimiting, by the bus current regulator, the bus current to be within a range defined by a maximum current limit and a minimum current limit. 16. The method of claim 15, where calculating the adjustment is dependent on lower and upper voltage thresholds and lower and upper voltage gains. 17. The method of claim 16, further comprising: adjusting the upper current threshold of the bus current regulator based on exceeding a speed limit or when the bus voltage goes below a minimum acceptable bus voltage. 18. The method of claim 17, further comprising the bus current regulator: receiving bus voltage, speed, maximum current, maximum speed, and minimum bus voltage as inputs; andgenerating the maximum current limit. 19. The method of claim 16, further comprising: adjusting the upper current threshold of the bus current regulator based on a rotor of the propeller drive unit turning below a lower speed limit or when the bus voltage exceeds a maximum acceptable bus voltage. 20. The method of claim 19, further comprising the bus current regulator: receiving bus voltage, speed, minimum current, minimum speed, and maximum bus voltage as inputs; andgenerating the minimum current limit. 21. The method of claim 15, further comprising adjusting the bus current dependent on the following inputs: bus voltage, a lower and an upper voltage threshold; a change in current between the lower and upper voltage thresholds; a lower voltage gain associated with the bus current when the bus voltage is less than the lower voltage threshold; and a higher voltage gain associated with the bus current when the bus voltage is greater than the upper voltage threshold.
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