IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
UP-0034809
(2008-02-21)
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등록번호 |
US-7757549
(2010-08-09)
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발명자
/ 주소 |
- Andreae, Morgan
- Dale, Adrian P.
- Matthews, Jeffrey
- Rankin, William A.
- Sujan, Vivek A.
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출원인 / 주소 |
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대리인 / 주소 |
Kunzler Needham Massey & Thorpe
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인용정보 |
피인용 횟수 :
6 인용 특허 :
11 |
초록
▼
An apparatus, system, and method are disclosed for predictive control of a turbocharger. The method includes interpreting a compressor performance model for a turbocharger, and interpreting at least one current operating parameter. The method further includes calculating a performance margin, calcul
An apparatus, system, and method are disclosed for predictive control of a turbocharger. The method includes interpreting a compressor performance model for a turbocharger, and interpreting at least one current operating parameter. The method further includes calculating a performance margin, calculating a performance margin derivative, and calculating a response value. The performance margin comprises a choke margin or a surge margin according to the position of an operating point in the compressor performance model. The performance margin is implemented in a first sigmoid function, and the performance margin derivative is implemented in a second sigmoid function. The response value is determined by applying a MIN function to the output of the product of the sigmoid functions in the choke margin case, and by applying a MAX function to the product of the sigmoid functions in the surge margin case.
대표청구항
▼
What is claimed is: 1. A method for predictive control of a turbocharger, the method comprising: determining a compressor performance model for a turbocharger; determining at least one current operating parameter; calculating a performance margin according to the at least one current operating para
What is claimed is: 1. A method for predictive control of a turbocharger, the method comprising: determining a compressor performance model for a turbocharger; determining at least one current operating parameter; calculating a performance margin according to the at least one current operating parameter and the compressor performance model; calculating a performance margin derivative comprising a rate of change of the performance margin over a time interval; calculating a response value according to the performance margin and the performance margin derivative, the response value comprising a gain value for a control function of the turbocharger; and controlling the turbocharger according to the calculated response value. 2. The method of claim 1, wherein determining the at least one current operating parameter comprises determining at least one current operating parameter selected from the group consisting of a compressor inlet pressure, a compressor outlet pressure, a pressure ratio across a compressor, an inlet temperature, an exhaust gas recirculation (EGR) fraction, an EGR flow, an inlet air flow, a corrected air flow, a mass flow, a turbine wheel speed, a compressor wheel speed, and a turboshaft speed. 3. The method of claim 1, wherein calculating the response value comprises controlling at least one actuator selected from the group consisting of an exhaust gas recirculation (EGR) valve, a variable geometry turbocharger (VGT), a variable geometry compressor (VGC), a wastegate, a compressor bypass valve, a turbine bypass valve, and an intake air throttle. 4. The method of claim 1, wherein calculating the response value comprises determining a gain value for a control function, wherein the performance margin comprises a choke margin, and wherein y1=choke margin, y2=d(choke margin)/dt, the gain value calculated using a first sigmoidal function of the form: FS 1 ( y 1 ) = a 1 ( 1 + ⅇ b 1 * ( y 1 - c 1 ) ) + d 1 , and a second sigmoidal function of the form: FS 2 ( y 2 ) = a 2 ( 1 + ⅇ b 2 * ( y 2 - c 2 ) ) + d 2 . 5. The method of claim 4, wherein determining the gain value comprises implementing constant values corresponding to: a1=−0.1, b1=−0.25, c1=15, d1=1, a2=0.1, b2=−1, c2=3.5, and d2=1. 6. The method of claim 4, wherein determining the gain value comprises implementing the constants with a range of values corresponding to: a1 ranging from about −0.05 to −0.5, b1 ranging from about −0.1 to −0.6, and c1 ranging from about −10 to 20, a2 ranging from about 0.05 to 0.5, b2 ranging from about −0.1 to −2, and c2 ranging from about −2 to 6. 7. The method of claim 4, wherein determining the gain value further comprises applying a MIN function such that: RV=min[(FS1(y1)*FS2(y2)),1]. 8. The method of claim 7, wherein the gain value comprises a boost pressure target gain value. 9. The method of claim 1, wherein calculating the response value comprises determining a gain value for a control function, wherein the performance margin comprises a surge margin, and wherein y1=surge margin, y2=d(surge margin)/dt, the gain value calculated using a first sigmoidal function of the form: FS 1 ( y 1 ) = a 1 ( 1 + ⅇ b 1 * ( y 1 - c 1 ) ) + d 1 , and a second sigmoidal function of the form: FS 2 ( y 2 ) = a 2 ( 1 + ⅇ b 2 * ( y 2 - c 2 ) ) + d 2 . 10. The method of claim 9, wherein determining the gain value comprises implementing constant values corresponding to: a1=0.1, b1=−0.25, c1=15, d1=1, a2=−0.1, b2=−1, c2=3.5, and d2=1. 11. The method of claim 9, wherein determining the gain value comprises implementing the constants with a range of values corresponding to: a1 ranging from about 0.05 to 0.5, b1 ranging from about −0.1 to −0.6, c1 ranging from about −10 to 20, a2 ranging from about −0.05 to −0.5, b2 ranging from about −0.1 to −2.0, and c2 ranging from about −2 to 6. 12. The method of claim 9, wherein determining the gain value further comprises applying a MAX function such that: RV=max[(FS1(y1)*FS2(y2)),1]. 13. The method of claim 12, wherein the gain value comprises a boost pressure target gain value. 14. A computer program product for predictive control of a turbocharger, wherein the computer readable program when executed on a computer causes the computer to: determine a compressor performance model for a high pressure turbocharger; determine current operating parameters, the operating parameters comprising a pressure ratio and a corrected flow corresponding to the high pressure turbocharger; calculate a performance margin based on the pressure ratio, the corrected flow, and the compressor performance model; calculate a performance margin derivative comprising a rate of change of the performance margin over a time interval; determine a response value according to the performance margin and the performance margin derivative, the response value comprising a gain value for a boost target function for the high pressure turbocharger; and control a turbine bypass valve such that the boost target is achieved. 15. The computer program product of claim 14, wherein the compressor performance model comprises a compressor performance model for a high pressure turbocharger in a two-turbocharger system. 16. The computer program product of claim 14, wherein the current operating parameters further comprises at least one current operating parameter selected from the group consisting of a compressor inlet pressure, a compressor outlet pressure, an inlet temperature, an exhaust gas recirculation (EGR) fraction, an EGR flow, an inlet air flow, a mass flow, a turbine wheel speed, a compressor wheel speed, and a turboshaft speed. 17. The computer program product of claim 14, wherein the computer readable program when executed on a computer causes the computer to calculate the response value, the response value comprising a boost target for a turbocharger charge pressure. 18. The computer program product of claim 14, wherein the computer readable program when executed on a computer causes the computer to calculate the response value by determining a gain value for a control function, wherein the performance margin comprises a choke margin, and wherein y1=choke margin, y2=d(choke margin)/dt, the gain value calculated using a first sigmoidal function of the form: FS 1 ( y 1 ) = a 1 ( 1 + ⅇ b 1 * ( y 1 - c 1 ) ) + d 1 , and a second sigmoidal function of the form: FS 2 ( y 2 ) = a 2 ( 1 + ⅇ b 2 * ( y 2 - c 2 ) ) + d 2 . 19. The computer program product of claim 18, wherein the computer readable program when executed on a computer causes the computer to determine the gain value by implementing constant values corresponding to: a1=−0.1, b1=−0.25, c1=15, d1=1, a2=0.1, b2=−1, c2=3.5, and d2=1. 20. The computer program product of claim 18, wherein the computer readable program when executed on a computer causes the computer to determine the gain value by implementing the constants with a range of values corresponding to: a1 ranging from about −0.05 to −0.5, b1 ranging from about −0.1 to −0.6, and c1 ranging from about −10 to 20, a2 ranging from about 0.05 to 0.5, b2 ranging from about −0.1 to −2, and c2 ranging from about −2 to 6. 21. The computer program product of claim 18, wherein the computer readable program when executed on a computer causes the computer to determine the gain value by applying a MIN function such that: RV=min[(FS1(y1)*FS2(y2)),1]. 22. The computer program product of claim 21, wherein the gain value comprises a boost pressure target gain value. 23. The computer program product of claim 14, wherein the computer readable program when executed on a computer causes the computer to calculate the response value by determining a gain value for a control function, wherein the performance margin comprises a surge margin, and wherein y1=surge margin, y2=d(surge margin)/dt, the gain value calculated using a first sigmoidal function of the form: FS 1 ( y 1 ) = a 1 ( 1 + ⅇ b 1 * ( y 1 - c 1 ) ) + d 1 , and a second sigmoidal function of the form: FS 2 ( y 2 ) = a 2 ( 1 + ⅇ b 2 * ( y 2 - c 2 ) ) + d 2 . 24. The computer program product of claim 23, wherein the computer readable program when executed on a computer causes the computer to determine the gain value by implementing constant values corresponding to: a1=0.1, b1=−0.25, c1=15, d1=1, a2=−0.1, b2=−1, c2=3.5, and d2=1. 25. The computer program product of claim 23, wherein the computer readable program when executed on a computer causes the computer to determine the gain value by implementing the constants with a range of values corresponding to: a1 ranging from about 0.05 to 0.5, b1 ranging from about −0.1 to −0.6, c1 ranging from about −10 to 20, a2 ranging from about −0.05 to −0.5, b2 ranging from about −0.1 to −2.0, and c2 ranging from about −2 to 6. 26. The computer program product of claim 23, wherein the computer readable program when executed on a computer causes the computer to determine the gain value by applying a MAX function such that: RV=max[(FS1(y1)*FS2(y2)),1]. 27. The computer program product of claim 26, wherein the gain value comprises a boost pressure target gain value. 28. An apparatus for predictive control of a turbocharger, the apparatus comprising: a compressor performance module configured to determine a compressor performance model for a turbocharger; an operating parameters module configured to determine at least one operating parameter; a difference module configured to calculate a performance margin according to the at least one operating parameter and the compressor performance model; a derivation module configured to calculate a performance margin derivative, the performance margin derivative comprising a rate of change of the performance margin over a time interval; a response module configured to determine a response value according to the performance margin and the performance margin derivative, the response value comprising a gain value for a control function of the high pressure turbocharger; and a control module configured to control the turbocharger according to the determined response value. 29. The apparatus of claim 28, wherein the response value comprises a boost target specification for a turbocharger charge pressure. 30. The apparatus of claim 28, wherein the turbocharger comprises a high pressure turbocharger. 31. The apparatus of claim 28, wherein the turbocharger comprises a high pressure turbocharger in a two-turbocharger system. 32. A system for predictive control of a turbocharger, the system comprising: an internal combustion engine producing an exhaust stream; a turbocharger comprising a turbine coupled to a compressor, wherein the turbine receives the exhaust stream and the compressor receives an inlet air stream; a controller comprising: a compressor performance module configured to determine a compressor performance model for a turbocharger; an operating parameters module configured to determine at least one operating parameter; a difference module configured to calculate a performance margin according to the at least one operating parameter and the compressor performance model; a derivation module configured to calculate a performance margin derivative, the performance margin derivative comprising a rate of change of the performance margin over a time interval; a response module configured to determine a response value according to the performance margin and the performance margin derivative, the response value comprising a gain value for a control function of the turbocharger; and a control module configured to control the turbocharger according to the determined response value. 33. The system of claim 32, further comprising an exhaust gas recirculation (EGR) path, wherein a portion of the exhaust stream is directed through the EGR path when an EGR valve is open. 34. The system of claim 32, further comprising a turbocharger bypass path, wherein a portion of the exhaust stream is directed around the turbocharger when a bypass valve is open.
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