Single piston sleeve valve with optional variable compression ratio capability
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02B-075/04
F02D-015/04
F02D-015/00
F01L-005/06
F01L-007/04
출원번호
US-0270200
(2011-10-10)
등록번호
US-9650951
(2017-05-16)
발명자
/ 주소
Cleeves, James M.
Jackson, Simon David
Hawkes, Michael
Willcox, Michael A.
출원인 / 주소
PINNACLE ENGINES, INC.
대리인 / 주소
Mintz Levin Cohn Ferris Glovsky and Popeo, P.C.
인용정보
피인용 횟수 :
0인용 특허 :
45
초록▼
An internal combustion engine can include a piston moving in a cylinder and a junk head disposed opposite the piston head in the cylinder. The junk head can optionally be moveable between a higher compression ratio position closer to a top dead center of the piston and a lower compression ratio posi
An internal combustion engine can include a piston moving in a cylinder and a junk head disposed opposite the piston head in the cylinder. The junk head can optionally be moveable between a higher compression ratio position closer to a top dead center of the piston and a lower compression ratio position further from the top dead center position of the piston. At least one intake port can deliver a fluid comprising inlet air to a combustion chamber within the cylinder. Combustion gases can be directed out of the combustion volume through at least one exhaust port. One or both of the intake port and the exhaust port can be opened and closed by operation of a sleeve valve that at least partially encircles the piston. Related articles, systems, and methods are described.
대표청구항▼
1. A system comprising: a piston that moves within a cylinder of an internal combustion engine;a crankshaft connected to the piston by a connecting rod, the crankshaft rotating under influence of movement of the piston in the cylinder in accordance with an engine speed commanded by a throttle contro
1. A system comprising: a piston that moves within a cylinder of an internal combustion engine;a crankshaft connected to the piston by a connecting rod, the crankshaft rotating under influence of movement of the piston in the cylinder in accordance with an engine speed commanded by a throttle control;a junk head disposed opposite the piston proximate to a first end of the cylinder; anda first sleeve valve associated with a first port connecting to a combustion chamber defined at least in part by a head of the piston, an internal surface of the junk head, and the first sleeve valve, the first sleeve valve at least partially encircling the piston and opening and closing the first port by first movement between a first open position and a first closed position, a first sealing edge of the first sleeve valve being urged into contact with the first valve seat at the first closed position such that the first sealing edge is closer to the first end of the cylinder at the first closed position than at the first open position, the first movement comprising the first sleeve valve temporarily ceasing its motion in a direction aligned with an axis of the cylinder at the first closed position and at the first open position. 2. A system as in claim 1, further comprising a coolant circulation system that causes coolant to flow through one or more coolant channels in the junk head to maintain an internal surface of the junk head at or below a target junk head temperature. 3. A system as in claim 1, further comprising an ignition source disposed in the junk head. 4. A system as in claim 1, further comprising a second valve associated with a second port connecting to the combustion chamber, the second valve comprising either a second sleeve valve at least partially encircling the junk head or one or more poppet valves disposed in the junk head, wherein if the second valve is the second sleeve valve, the second sleeve opens and closes the second port by second movement between a second open position and a second closed position, the second closed position comprising a second sealing edge of the second sleeve valve being urged into contact with a second valve seat such that the second sealing edge is further from the first end of the cylinder at the second closed position than at the second open position, the second movement comprising the second sleeve valve ceasing its motion in the direction aligned with the axis of the cylinder both at the second closed position and at the second open position. 5. A system as in claim 4, wherein the first port comprises an intake port through which at least one of intake air and an air-fuel mixture is delivered to the combustion chamber, and the second port comprises an exhaust port through which exhaust gases resulting from combustion of a combustion mixture in the combustion chamber are exhausted. 6. A system as in claim 4, wherein the second port comprises an intake port through which at least one of intake air and an air-fuel mixture is delivered to the combustion chamber, and the first port comprises an exhaust port through which exhaust gases resulting from combustion of a combustion mixture in the combustion chamber are exhausted. 7. A system as in claim 4, further comprising an active cooling system associated with at least one of the first sleeve valve and the second valve to maintain the at least one of the first sleeve valve and the second valve at or below a target valve temperature. 8. A system as in claim 7, wherein the second valve comprises the one or more poppet valves, and the active cooling system comprises an oil supply tube inserted into a valve stem of the one or more poppet valves to deliver oil near a valve head of the one or more poppet valves and thereby maintain an internal surface valve head at or below the target valve head temperature. 9. A system as in claim 1, further comprising: a junk head translation system to cause movement of the junk head in the cylinder such that a distance of the junk head from a top dead center position of the piston is variable from a first cycle of the internal combustion engine to a second, later cycle of the internal combustion engine; anda controller configured to perform operations comprising:monitoring operation characteristics of the internal combustion engine to generate engine data;receiving a throttle input from the throttle control;determining a preferred compression ratio within the combustion chamber based on the engine data and the throttle input; andcommanding the junk head translation system to cause movement of the junk head in the direction to provide the preferred compression ratio, the command causing the junk head translation system to move the junk head closer to the top dead center position of the piston if the preferred compression ratio is greater than a current compression ratio and away from the top dead center position of the piston if the preferred compression ratio is less than the current compression ratio. 10. A system as in claim 9, wherein the engine data comprise at least one of a current engine speed, a current engine load, a detection of a premature detonation within the combustion chamber, and a current operation of a turbocharger or a supercharger that pressurizes and therefore adds heat to inlet air delivered to the combustion chamber. 11. A system as in claim 1, further comprising an elastic rebound mechanism that biases the junk head against a stop with a preload force directed away from the first end of the cylinder, the preload force being sufficient to retain the junk head against the stop up to a threshold combustion chamber pressure such that the junk head moves toward the first end of the cylinder to increase a combustion chamber volume during an engine cycle when the threshold combustion chamber pressure is exceeded. 12. A method comprising: opening a first sleeve valve associated with a first port connecting to a combustion chamber disposed within a cylinder of an internal combustion engine and defined at least in part by a head of a piston that moves within the cylinder, an internal surface of a junk head disposed proximate to a first end of the cylinder opposite the piston, and the first sleeve valve, the first sleeve valve at least partially encircling the piston, the opening comprising moving the first sleeve valve to an open position at which the first sleeve valve temporarily ceases its motion in a direction aligned with an axis of the cylinder;closing the first sleeve valve, the closing comprising moving the first sleeve valve to a first closed position at which the first sleeve valve temporarily ceases its motion in the direction aligned with the axis of the cylinder and at which a sealing edge of the sleeve valve is urged into contact with a valve seat such that the sealing edge is closer to the first end of the cylinder at the closed position than at the open position; androtating a crankshaft connected to the piston by a connecting rod, the crankshaft rotating under influence of movement of the piston in the cylinder in accordance with an engine speed commanded by a throttle control. 13. A method as in claim 12, further comprising causing coolant to flow through one or more coolant channels in the junk head to maintain an internal surface of the junk head at or below a target junk head temperature. 14. A method as in claim 12, wherein the internal combustion engine further comprises a second valve associated with a second port connecting to the combustion chamber, the second valve comprising either a second sleeve valve at least partially encircling the junk head or one or more poppet valves, wherein if the second valve is the second sleeve valve, the second sleeve valve opens and closes the second port by second movement between a second open position and a second closed position, the second closed position comprising a second sealing edge of the second sleeve valve being urged into contact with a second valve seat such that the second sealing edge is further from the first end of the cylinder at the second closed position than at the second open position, the second movement comprising the second sleeve valve ceasing its motion in the direction aligned with the axis of the cylinder both at the second closed position and at the second open position. 15. A method as in claim 14, further comprising maintaining the at least one of the first sleeve valve and the second valve at or below a target valve temperature using an active cooling system associated with at least one of the first sleeve valve and the second valve. 16. A method as in claim 14, wherein the second valve comprises the one or more poppet valves, and the active cooling system comprises an oil supply tube inserted into a valve stem of the one or more poppet valves to deliver oil near a valve head of the one or more poppet valves and thereby maintain an internal surface valve head at or below the target valve head temperature. 17. A method as in claim 12, further comprising: causing movement of the junk head in the cylinder using a junk head translation system;monitoring operation characteristics of the internal combustion engine to generate engine data;receiving a throttle input from the throttle control;determining a preferred compression ratio within the combustion chamber based on the engine data and the throttle input; andcommanding a junk head translation system that varies a distance between the junk head and a top dead center position of the piston from a first cycle of the internal combustion engine to a second, later cycle of the internal combustion engine, the commanding comprising causing the junk head translation system to move the junk head closer to the top dead center position of the piston if the preferred compression ratio is greater than a current compression ratio and away from the top dead center position of the piston if the preferred compression ratio is less than the current compression ratio. 18. A method as in claim 17, wherein the engine data comprise at least one of a current engine speed, a current engine load, a detection of a premature detonation within the combustion chamber, and a current operation of a turbocharger or a supercharger that pressurizes and therefore adds heat to inlet air delivered to the combustion chamber. 19. A method as in claim 12, further comprising biasing the junk head against a stop with a preload force directed away from the first end of the cylinder, the preload force being sufficient to retain the junk head against the stop up to a threshold combustion chamber pressure such that the junk head moves toward the first end of the cylinder to increase a combustion chamber volume during an engine cycle when the threshold combustion chamber pressure is exceeded. 20. A method comprising: monitoring operation characteristics of an internal combustion engine to generate engine data, the internal combustion engine comprising a piston moving in a cylinder and a junk head disposed proximate to a first end of the cylinder opposite the piston, wherein the junk head is not attached, either directly or via a connecting rod, to a crankshaft for power output;receiving a throttle input from a throttle control of the internal combustion engine;determining a preferred compression ratio within the combustion chamber based on the engine data and the throttle input;commanding a junk head translation system that varies a distance between the junk head and a top dead center position of the piston from a first cycle of the internal combustion engine to a second, later cycle of the internal combustion engine, the commanding comprising causing the junk head translation system to move the junk head closer to the top dead center position of the piston if the preferred compression ratio is greater than a current compression ratio and away from the top dead center position of the piston if the preferred compression ratio is less than the current compression ratio; andclosing a first sleeve valve, the closing comprising moving the first sleeve valve to a first closed position at which the first sleeve valve temporarily ceases its motion in the direction aligned with the axis of the cylinder and at which a sealing edge of the sleeve valve is urged into contact with a valve seat such that the sealing edge is closer to the first end of the cylinder at the closed position than at the open position. 21. A system as in claim 1, wherein the junk head comprises a compression or oil-sealing piston ring, and wherein the junk head is stationary in the cylinder. 22. A system as in claim 1, wherein the junk head comprises a compression or oil-sealing piston ring, and wherein the junk head is moveable between at least two positions to vary a distance between the junk head and a top dead center position of the piston, the varying of the distance occurring at a rate governed by the throttle control rather than by a speed at which the internal combustion engine is operating. 23. A system as in claim 1, wherein the first valve seat forms a part of the first port.
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이 특허에 인용된 특허 (45)
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