Optimal utilization of power converters based on thermal characteristics
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B60R-022/00
F02N-011/04
F02N-011/10
H02H-005/04
출원번호
US-0146240
(2008-06-25)
등록번호
US-8860245
(2014-10-14)
발명자
/ 주소
Saxena, Sunit Kumar
Santhirahasan, Venkatesan
Anghel, Cristian
출원인 / 주소
Honeywell International Inc.
대리인 / 주소
Shimokaji & Assoc. P.C.
인용정보
피인용 횟수 :
1인용 특허 :
6
초록▼
A method and system for utilization of power converters in an aircraft engine start system includes measurement of power converter operation data that is utilized with a mathematical model of the power converter thermal characteristics to calculate operation limits for subsequent start duty cycles.
A method and system for utilization of power converters in an aircraft engine start system includes measurement of power converter operation data that is utilized with a mathematical model of the power converter thermal characteristics to calculate operation limits for subsequent start duty cycles. A warning indicator is utilized in the event the start duty cycle limits are exceeded. This invention can be extended for any More Electric Vehicle applications, which utilizes an electric engine start system.
대표청구항▼
1. A method of utilizing a power converter to start an aircraft engine, the method comprising: acquiring thermal characteristics data of said power converter during operation;developing a mathematical model based on said thermal characteristics data;acquiring measured operation data of said power co
1. A method of utilizing a power converter to start an aircraft engine, the method comprising: acquiring thermal characteristics data of said power converter during operation;developing a mathematical model based on said thermal characteristics data;acquiring measured operation data of said power converter and known operation limits of said power converter, said measured operation data including durations of one or more start attempts of said power converter, wherein said power converter applies power to a generator during said one or more start attempts, and one or more wait period durations after termination of each of the one or more start attempts; andutilizing said mathematical model and said measured operation data for calculating operation parameters for subsequent operations of said power converter, said calculated operation parameters including maximum operation durations, during which power is applied by said power converter to said generator, and minimum wait durations after each of the one or more start attempts. 2. The method of claim 1, wherein utilizing said calculated operation parameters in successive operations of said power converter to start the aircraft engine comprises: applying power from said power converter to said generator during a first start attempt when an engine start mode switch is switched into a START state;applying power from said generator to the aircraft engine during said first start attempt for a period up to said maximum operation duration;if the first start attempt is successful, removing power from said generator to the aircraft engine when the engine start mode switch is switched into an ON state; andif the first start attempt is unsuccessful, removing power from said generator to the aircraft engine for the minimum wait period before applying power from said power converter to said generator during a subsequent start attempt. 3. The method of claim 1 wherein said mathematical model comprises linear equations. 4. The method of claim 1 wherein said mathematical model comprises non-linear equations. 5. The method of claim 1 wherein said mathematical model comprises a single equation. 6. The method of claim 1, wherein said mathematical model is expressed as YT=Yr+Yw=[(S−X)+G*(S/W)], where YT equals a total next operation duration, Yr equals a remaining operation duration in seconds, Yw equals a next operation duration in seconds, S equals a rated maximum operation duration of the power converter in seconds, W equals a rating minimum wait period of the power converter in minutes, X equals an operation duration of the power converter in seconds, and G equals a wait period in minutes. 7. A system for starting an engine, comprising: a starter generator connected to said engine;a power converter configured to supply converted electrical power to said starter generator;a power supply configured to provide electrical power to said power converter;a control switch configured to control the application of said converted electrical power to said starter generator;a measurement device for acquiring operation data of said power converter and known operation limits of said power converter, said measured operation data including successive start attempt durations of said power converter, wherein said power converter applies power to a generator during start attempts of an aircraft engine, and successive wait period durations after termination each of said start attempts;a mathematical model of the thermal characteristics of said power converter based at least partly on said operation data and used to calculate operation parameters for subsequent operations of said power converter, said calculated operation parameters including maximum starter attempt durations, and minimum wait durations after each of the maximum starter attempt durations,an operation parameters indicator configured to indicate operation parameters of the next operation of said control switch, wherein the operation parameters are at least partly based on thermal characteristics of the power converter and include durations of previous starter attempts of the engine, during which power was applied by said power converter to said starter generator, and a minimum wait duration until a next starter attempt if a previous starter attempt is unsuccessful; andan operation warning indicator configured to indicate the operation of said control switch in excess of the operation parameters. 8. The system of claim 7 wherein said measurement device acquires said operation data from said power converter. 9. The system of claim 7 wherein said measurement device acquires said operation data from said control switch. 10. The system of claim 7 wherein said operation data is acquired by said system controller. 11. The system of claim 7 further comprising a control switch disabler for preventing the operation of said control switch in excess of said operation parameters. 12. The system of claim 7 further comprising a mathematical model of the thermal characteristics of said power converter, wherein the model is expressed as YT=Yr+Yw=[(S−X)+G*(S/W)], where YT equals a total next operation duration, Yr equals a remaining operation duration in seconds, Yw equals a next operation duration in seconds, S equals a rated maximum operation duration of the power converter in seconds, W equals a rating minimum wait period of the power converter in minutes, X equals an operation duration of the power converter in seconds, and G equals a wait period in minutes before initiating a start attempt. 13. The system of claim 7 wherein said operation parameters indicator is continually updated at an approximately constant frequency. 14. The system of claim 7 wherein said operation parameters indicator is updated when said operation parameters change.
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이 특허에 인용된 특허 (6)
Ma,Jack; Zhou,George; Wang,Zheng, Advanced current control method and apparatus for a motor drive system.
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