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다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0992074 (2004-11-19) |
등록번호 | US-7252054 (2007-08-07) |
발명자 / 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 | 피인용 횟수 : 16 인용 특허 : 395 |
Engines and methods of controlling an engine may involve one or more cams associated with engine intake and/or exhaust valves. In some examples, shifting the rotational phase of one or more cams advances and/or delays timing of the opening and/or closing of valves. Timing of valve closing/opening an
Engines and methods of controlling an engine may involve one or more cams associated with engine intake and/or exhaust valves. In some examples, shifting the rotational phase of one or more cams advances and/or delays timing of the opening and/or closing of valves. Timing of valve closing/opening and possible use of an air supply system may enable engine operation according to a Miller cycle.
What is claimed is: 1. A method of operating an internal combustion engine including at least one cylinder and a piston slidable in the cylinder, the method comprising: supplying pressurized air from an intake manifold to an air intake port of a combustion chamber in the cylinder; operating an air
What is claimed is: 1. A method of operating an internal combustion engine including at least one cylinder and a piston slidable in the cylinder, the method comprising: supplying pressurized air from an intake manifold to an air intake port of a combustion chamber in the cylinder; operating an air intake valve to open the air intake port to allow pressurized air to flow between the combustion chamber and the intake manifold substantially during a majority portion of a compression stroke of the piston, wherein operating the air intake valve includes operating the air intake valve via at least first and second rotatable cams associated with the air intake valve; and shifting rotational phase of at least one of the first cam and a camshaft including the first cam; wherein the engine has a variable compression ratio; wherein the engine includes an adjustment device adapted to adjust the position of the second cam relative to a rocker arm operably coupled with the air intake valve. 2. The method of claim 1, wherein the operation of the air intake valve is based on at least one engine condition. 3. The method of claim 1, further including controlling a fuel supply system to inject fuel into the combustion chamber. 4. The method of claim 3, further including injecting at least a portion of the fuel during a portion of the compression stroke. 5. The method of claim 4, wherein injecting at least a portion of the fuel includes supplying a pilot injection at a predetermined crank angle before a main injection. 6. The method of claim 5, wherein said main injection begins during the compression stroke. 7. The method of claim 1, further including cooling the pressurized air prior to supplying the pressurized air to the air intake port. 8. The method of claim 1, wherein said supplying includes supplying a mixture of pressurized air and recirculated exhaust gas from the intake manifold to the air intake port, and wherein said operating of the air intake valve includes operating the air intake valve to open the air intake port to allow the pressurized air and exhaust gas mixture to flow between the combustion chamber and the intake manifold substantially during a majority portion of the compression stroke of the piston. 9. The method of claim 8, wherein said supplying a mixture of pressurized air and recirculated exhaust gas includes providing a quantity of exhaust gas from an exhaust gas recirculation (EGR) system. 10. The method of claim 1, further including rotating the first cam to open the intake valve and shifting rotational phase of at least one of the second cam and a camshaft including the second cam to hold the valve open during at least part of the substantial portion of the compression stroke. 11. The method of claim 1, wherein the shifting of the rotational phases varies the timing of closure of the intake valve. 12. An internal combustion engine, comprising: an engine block defining at least one cylinder; a head connected with said engine block, the head including an air intake port, and an exhaust port; a piston slidable in the cylinder; a combustion chamber being defined by said head, said piston, and said cylinder; an air intake valve movable to open and close the air intake port; an air supply system including at least one turbocharger fluidly connected to the air intake port; a fuel supply system operable to inject fuel into the combustion chamber; a first cam and second cam rotatable to operate the air intake valve; a phase shifting device configured to shift rotational phase of one of the first and second cams; and an adjustment device adapted to adjust the position of the second cam relative to a rocker arm operably coupled with the air intake valve. 13. The engine of claim 12, wherein the engine is configured so that adjustment of the rotational phase of said one of the first cam and second cam causes said one of the first cam and second cam to keep the intake valve open during a portion of a compression stroke of the piston. 14. The engine of claim 13, wherein the engine is configured to keep the intake valve open for a portion of a second half of the compression stroke. 15. The engine of claim 12, wherein the engine is configured to close the intake valve before bottom dead center of an intake stroke of the piston. 16. The engine of claim 12, wherein rotation of the first cam opens the intake valve, and wherein the phase shifting device is configured to shift rotational phase of the second cam so that the second cam holds the valve open. 17. The engine of claim 12, wherein the at least one turbocharger includes a first turbine coupled with a first compressor, the first turbine being in fluid communication with the exhaust port, the first compressor being in fluid communication with the air intake port; and wherein the air supply system further includes a second compressor being in fluid communication with atmosphere and the first compressor. 18. The engine of claim 12, wherein the at least one turbocharger includes a first turbocharger and a second turbocharger, the first turbocharger including a first turbine coupled with a first compressor, the first turbine being in fluid communication with the exhaust port and an exhaust duct, the first compressor being in fluid communication with the air intake port, the second turbocharger including a second turbine coupled with a second compressor, the second turbine being in fluid communication with the exhaust duct of the first turbocharger and atmosphere, and the second compressor being in fluid communication with atmosphere and the first compressor. 19. The engine of claim 12, further including an exhaust gas recirculation (EGR) system operable to provide a portion of exhaust gas from the exhaust port to the air supply system. 20. A method of operating an internal combustion engine including at least one cylinder and a piston slidable in the cylinder, the method comprising: imparting rotational movement to a first turbine and a first compressor of a first turbocharger with exhaust air flowing from an exhaust port of the cylinder; imparting rotational movement to a second turbine and a second compressor of a second turbocharger with exhaust air flowing from an exhaust duct of the first turbocharger; compressing air drawn from atmosphere with the second compressor; compressing air received from the second compressor with the first compressor; supplying pressurized air from the first compressor to an air intake port of a combustion chamber in the cylinder via an intake manifold; operating a fuel supply system to inject fuel directly into the combustion chamber; and operating an air intake valve to open the air intake port to allow pressurized air to flow between the combustion chamber and the intake manifold, wherein the engine has a variable compression ratio; wherein operating the air intake valve includes operating the air intake valve via at least first and second rotatable cams associated with the air intake valve; and shifting rotational phase of at least one of the first cam and a camshaft including the first cam; wherein the engine includes an adjustment device adapted to adjust the position of the second cam relative to a rocker arm operably coupled with the air intake valve. 21. The method of claim 20, wherein fuel is injected during a combustion stroke of the piston. 22. The method of claim 20, wherein the fuel injection begins during a compression stroke of the piston. 23. The method of claim 20, wherein said operating of the air intake valve includes operating the air intake valve to open the air intake port to allow pressurized air to flow between the combustion chamber and the intake manifold during a portion of a compression stroke of the piston. 24. The method of claim 23, wherein said operating of the air intake valve includes operating the intake valve to remain open for a portion of a second half of a compression stroke of the piston. 25. The method of claim 20, wherein said operating of the air intake valve includes operating the intake valve to close the intake valve before bottom dead center of an intake stroke of the piston. 26. The method of claim 20, further including cyclically moving the intake valve, wherein said operating includes interrupting cyclical movement of the intake valve. 27. The method of claim 20, wherein the operation of the air intake valve is based on at least one engine condition. 28. The method of claim 20, wherein said first and second compressors compress a mixture of air and recirculated exhaust gas, and wherein said supplying includes supplying the compressed mixture of pressurized air and recirculated exhaust gas to said intake port via said intake manifold. 29. The method of claim 20, further including rotating the first cam to open the intake valve and shifting rotational phase of at least one of the second cam and a camshaft including the second cam to hold the valve open. 30. The method of claim 20, wherein the shifting of the rotational phases varies the timing of closure of the intake valve. 31. A method of controlling an internal combustion engine having a variable compression ratio, said engine including a block defining a cylinder, a piston slidable in said cylinder, and a head connected with said block, said piston, said cylinder, and said head defining a combustion chamber, the method comprising: pressurizing air; supplying said air to an intake manifold of the engine; maintaining fluid communication between said combustion chamber and the intake manifold during a portion of an intake stroke and through a portion of a compression stroke; wherein the maintaining includes operating an air intake valve via at least first and second rotatable cams associated with the air intake valve; shifting rotational phase of at least one of the first cam and a camshaft including the first cam; and injecting fuel directly into the combustion chamber; wherein the engine includes an adjustment device adapted to adjust the position of the second cam relative to a rocker arm operably coupled with the air intake valve. 32. The method of claim 31, wherein said injecting fuel includes injecting fuel directly to the combustion chamber during a portion of the combustion stroke. 33. The method of claim 31, wherein said injecting includes supplying a pilot injection at a predetermined crank angle before a main injection. 34. The method of claim 31, wherein said portion of the compression stroke is at least a majority of the compression stroke. 35. The method of claim 31, wherein said pressurizing includes a first stage of pressurization and a second stage of pressurization. 36. The method of claim 35, further including cooling air between said first stage of pressurization and said second stage of pressurization. 37. The method of claim 31, further including cooling the pressurized air. 38. The method of claim 31, wherein the pressurizing includes pressurizing a mixture of air and recirculated exhaust gas, and wherein the supplying includes supplying the pressurized air and exhaust gas mixture to the intake manifold. 39. The method of claim 38, further including cooling the pressurized air and exhaust gas mixture. 40. The method of claim 31, further including varying closing time of the intake valve so that a duration of said portion of the compression stroke differs in multiple compression strokes of the piston. 41. The method of claim 31, further including rotating the first cam to open the intake valve and shifting rotational phase of at least one of the second cam and a camshaft including the second cam to hold the valve open during at least part of the portion of the compression stroke. 42. The method of claim 31, wherein the shifting of the rotational phases varies the timing of closure of the intake valve. 43. A method of operating an internal combustion engine including at least one cylinder and a piston slidable in the cylinder, the method comprising: supplying pressurized air from an intake manifold to an air intake port of a combustion chamber in the cylinder; operating an air intake valve to open the air intake port to allow pressurized air to flow between the combustion chamber and the intake manifold substantially during a portion of a compression stroke of the piston, wherein the engine has a variable compression ratio; wherein operating the air intake valve includes operating the air intake valve via at least first and second rotatable cams associated with the air intake valve; shifting rotational phase of at least one of the first cam and a camshaft including the first cam; and injecting fuel into the combustion chamber after the intake valve is closed, wherein the injecting includes supplying a pilot injection of fuel at a crank angle before a main injection of fuel; wherein the engine includes an adjustment device adapted to adjust the position of the second cam relative to a rocker arm operably coupled with the air intake valve. 44. The method of claim 43, wherein at least a portion of the main injection occurs during a combustion stroke of the piston. 45. The method of claim 43, further including cooling the pressurized air prior to supplying the pressurized air to the air intake port. 46. The method of claim 43, wherein said supplying includes supplying a mixture of pressurized air and recirculated exhaust gas from the intake manifold to the air intake port, and wherein said operating includes operating the air intake valve to open the air intake port to allow the pressurized air and exhaust gas mixture to flow between the combustion chamber and the intake manifold substantially during a portion of the compression stroke of the piston. 47. The method of claim 46, wherein said supplying a mixture of pressurized air and recirculated exhaust gas includes providing a quantity of exhaust gas from an exhaust gas recirculation (EGR) system. 48. The method of claim 43, further including rotating the first cam to open the intake valve and shifting rotational phase of at least one of the second cam and a camshaft including the second cam to hold the valve open during at least part of the portion of the compression stroke. 49. The method of claim 43, wherein the shifting of the rotational phases varies the timing of closure of the intake valve.
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