[미국특허]
Stored compressed air management and flow control for improved engine performance
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02D-009/08
F02B-033/00
출원번호
US-0761076
(2010-04-15)
등록번호
US-8371276
(2013-02-12)
발명자
/ 주소
Pursifull, Ross Dykstra
Ulrey, Joseph Norman
출원인 / 주소
Ford Global Technologies, LLC
인용정보
피인용 횟수 :
12인용 특허 :
21
초록▼
A method for providing air to a combustion chamber of an engine, the engine including a compressor and a boost tank selectably coupled to an intake manifold. The method comprises admitting air from the compressor to the intake manifold via a main throttle valve, storing some air from the compressor
A method for providing air to a combustion chamber of an engine, the engine including a compressor and a boost tank selectably coupled to an intake manifold. The method comprises admitting air from the compressor to the intake manifold via a main throttle valve, storing some air from the compressor in a boost tank, and discharging some of the air stored in the boost tank to the intake manifold via an auxiliary throttle valve distinct from the main throttle valve.
대표청구항▼
1. A method for providing air to a combustion chamber of an engine, the engine including a compressor and a boost tank selectably coupled to an intake manifold, the method comprising: admitting air from the compressor to the intake manifold via a main throttle valve;storing some air from the compres
1. A method for providing air to a combustion chamber of an engine, the engine including a compressor and a boost tank selectably coupled to an intake manifold, the method comprising: admitting air from the compressor to the intake manifold via a main throttle valve;storing some air from the compressor in a boost tank; anddischarging some of the air stored in the boost tank to the intake manifold via an auxiliary throttle valve distinct from the main throttle valve, the main and auxiliary throttles each positioned downstream of the compressor and in parallel with one another. 2. The method of claim 1, wherein discharging some of the air stored in the boost tank comprises displacing EGR-diluted air in the intake manifold, the EGR-diluted air including at least some low-pressure EGR (LP-EGR). 3. The method of claim 2, further comprising holding the main throttle valve open during said displacing to release the EGR-diluted air from the intake manifold. 4. The method of claim 3, further comprising closing the main throttle valve to prevent reverse air flow through the main throttle valve absent said displacing. 5. The method of claim 1, wherein discharging some of the air stored in the boost tank further comprises discharging when a throttle inlet pressure is below a threshold. 6. The method of claim 1, wherein discharging some of the stored air comprises drawing additional air into the intake manifold via an air ejector coupled between the boost tank and the intake manifold. 7. The method of claim 1, wherein storing some air from the compressor comprises flowing air through a restrictive by-pass of the compressor. 8. The method of claim 7, wherein the restrictive by-pass comprises a laminar-flow element. 9. The method of claim 1, wherein discharging some of the stored air comprises flowing the stored air through a pressure-recovery cone coupled between an air ejector and the intake manifold. 10. The method of claim 1, wherein discharging some of the stored air comprises discharging concurrent with throttle closure. 11. The method of claim 1, wherein discharging some of the stored air comprises discharging in response to throttle opening. 12. A method for providing air to a combustion chamber of an engine, the engine including an intake manifold coupled to a compressor via a main throttle valve and further coupled to a boost tank, the engine also including an auxiliary throttle valve distinct from the main throttle valve, the method comprising: admitting air from the compressor to the intake manifold via the main throttle valve;storing some air from the compressor in the boost tank; anddischarging some of the air stored in the boost tank to the intake manifold via the auxiliary throttle in response to an increased opening of the main throttle valve; anddischarging some of the air stored in the boost tank to the intake manifold via the auxiliary throttle in response to a decreased opening of the main throttle valve. 13. The method of claim 12, wherein storing some of the air comprises storing air having a first relative amount of exhaust gas during a first operating condition and discharging the stored air in response to throttle valve opening. 14. The method of claim 13, wherein storing some of the air further comprises storing air having a second relative amount of exhaust gas during a second operating condition and discharging the stored air in response to throttle valve closure, wherein the second relative amount is less than the first relative amount, and wherein the second condition includes a greater engine speed than the first condition. 15. A system comprising: an intake manifold coupled to a main throttle valve and to an auxiliary throttle valve;a compressor fluidically coupled to the main throttle valve, mechanically coupled to an exhaust-driven turbine, and configured to admit exhaust tapped from downstream of the turbine to upstream of the compressor; anda boost tank fluidically coupled to the auxiliary throttle valve. 16. The system of claim 15, further comprising an air ejector having a primary inlet coupled to the boost tank, a secondary inlet coupled to an air source, and an outlet coupled to the intake manifold. 17. The system of claim 16, wherein the auxiliary throttle valve is coupled between the air source and the secondary inlet of the air ejector. 18. The system of claim 16, wherein the auxiliary throttle valve is coupled between the outlet of the air ejector and the intake manifold. 19. The system of claim 16, further comprising a pressure-recovery cone coupled between the air ejector and the intake manifold. 20. The system of claim 15, wherein the main throttle valve is configured to admit air flow in a forward direction and in a reverse direction. 21. A method, comprising: recirculating exhaust gas (LP-EGR) from downstream of a turbine to upstream of a compressor in a turbocharged engine;admitting air from the compressor to an engine intake manifold via a main throttle valve;storing some air from the compressor in a boost tank; anddischarging stored air to the intake manifold via an auxiliary throttle valve in distinct from the main throttle valve to displace LP-EGR in the intake manifold.
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