Method and system for limiting output of a boosted engine
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02B-033/44
F02B-027/04
F01N-005/04
F02B-037/24
F02D-041/02
F02D-023/00
F02D-041/00
F02B-039/16
F01N-009/00
F02D-041/14
F02B-037/12
출원번호
US-0860886
(2013-04-11)
등록번호
US-8931272
(2015-01-13)
발명자
/ 주소
Fulton, Brien Lloyd
Chamarthi, Gopal Krishna
Pennala, Dean
Ives, David
Nader, David Robert
Niessen, Paul Martin
Smith, Jason Ronald
출원인 / 주소
Ford Global Technologies, LLC
대리인 / 주소
Voutyras, Julia
인용정보
피인용 횟수 :
0인용 특허 :
9
초록▼
A method for operating a turbocharged engine is disclosed. In one example, during a first condition an engine operation is adjusted in response to a turbocharger expansion ratio exceeding a first limit and during a second condition an engine operation is adjusted in response to the turbocharger expa
A method for operating a turbocharged engine is disclosed. In one example, during a first condition an engine operation is adjusted in response to a turbocharger expansion ratio exceeding a first limit and during a second condition an engine operation is adjusted in response to the turbocharger expansion ratio exceeding a second limit that differs from the first limit. Degradation of the engine may be reduced under some engine operating conditions by adjusting engine operation in response to the turbocharger expansion ratio.
대표청구항▼
1. An engine operating method, comprising: operating an engine with a turbocharger;during a first condition, adjusting operation of the engine in response to a turbine expansion ratio exceeding a first turbine expansion ratio limit of the turbocharger; andduring a second condition, adjusting operati
1. An engine operating method, comprising: operating an engine with a turbocharger;during a first condition, adjusting operation of the engine in response to a turbine expansion ratio exceeding a first turbine expansion ratio limit of the turbocharger; andduring a second condition, adjusting operation of the engine in response to a turbine expansion ratio exceeding a second turbine expansion ratio limit of the turbocharger that differs from the first turbine expansion ratio limit. 2. The engine operating method of claim 1, where the first turbine expansion ratio limit and the second turbine expansion ratio limit vary in response to an exhaust gas flow rate. 3. The engine operating method of claim 1, where the second turbine expansion ratio limit is less than the first turbine expansion ratio limit for a given exhaust gas flow rate. 4. The engine operating method of claim 1, where the adjusting operation of the engine includes reducing an available amount of engine torque to limit the turbine expansion ratio. 5. The engine operating method of claim 1, where the adjusting operation of the engine includes setting a desired boost level to an actual boost level, and maintaining the desired boost level at the actual boost level until the turbine expansion ratio is reduced below a limit. 6. The engine operating method of claim 1, where the first condition is a steady state condition and the second condition is a transient condition. 7. The engine operating method of claim 6, where the engine operates in the transient condition when a rate of change of engine speed and a fuel amount is greater than a threshold level. 8. The engine operating method of claim 1, where the adjusting operation of the engine includes adjusting an actuator to limit the turbine expansion ratio. 9. The engine operating method of claim 8, where the adjusting operation of the engine includes reducing an available amount of torque output of the engine in response to the turbine expansion ratio exceeding the turbine expansion ratio limit. 10. An engine operating method, comprising: operating an engine with a turbocharger;during a steady state condition, adjusting operation of the engine in response to a turbine expansion ratio exceeding a first turbine expansion ratio limit of the turbocharger; and during a transient condition, adjusting operation of the engine in response to a turbine expansion ratio exceeding a second turbine expansion ratio limit of the turbocharger that is less than the first expansion ratio limit for a given exhaust gas flow rate. 11. The engine operating method of claim 10, wherein the first turbine expansion ratio limit and the second turbine expansion ratio limit vary in response to an exhaust gas flow rate. 12. The engine operating method of claim 10, where the adjusting operation of the engine includes reducing an available amount of engine torque to limit the turbine expansion ratio. 13. The engine operating method of claim 10, where the adjusting operation of the engine includes setting a desired boost level to an actual boost level, and maintaining the desired boost level at the actual boost level until the turbine expansion ratio is reduced below a limit. 14. The engine operating method of claim 10, where the adjusting operation of the engine includes adjusting an actuator to limit the turbine expansion ratio. 15. The engine operating method of claim 14, where reducing the available amount of torque output of the engine includes limiting fuel injection timing of the engine. 16. An engine system, comprising: an engine having a turbocharger; anda controller, the controller including instructions for during a steady state mode adjusting operation of the engine in response to a turbine expansion ratio of the turbocharger exceeding a first turbine expansion ratio limit, and during a transient mode, adjusting operation of the engine in response to a turbine expansion ratio of the turbocharger exceeding a second turbine expansion ratio limit that is less than the first limit for a given exhaust gas flow rate. 17. The engine system of claim 16, wherein the first turbine expansion ratio limit and the second turbine expansion ratio limit vary in response to an exhaust gas flow rate. 18. The engine system of claim 16, where the controller includes further instructions for limiting an amount of fuel injected in response to the turbine expansion ratio exceeding the turbine expansion ratio limit. 19. The engine system of claim 16, where the adjusting operation of the engine includes setting a desired boost level to an actual boost level, and maintaining the desired boost level at the actual boost level until the turbine expansion ratio is reduced below a limit. 20. The engine system of claim 19, where the turbocharger is a variable geometry turbocharger, and where the boost level is adjusted by adjusting a vane position of the variable geometry turbocharger.
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이 특허에 인용된 특허 (9)
Iwasa Yoshio (Nagareyama JPX), Device for controlling supercharging pressure of an exhaust gas turbocharger.
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