IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0837054
(2013-03-15)
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등록번호 |
US-9291107
(2016-03-22)
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발명자
/ 주소 |
- Ross, Bryan Kelly
- Castner, James
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출원인 / 주소 |
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대리인 / 주소 |
Christensen O'Connor Johnson Kindness PLLC
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인용정보 |
피인용 횟수 :
0 인용 특허 :
27 |
초록
▼
Approaches to control engine overspeed are provided. Engine overspeed is controlled by one or more mechanisms that operate the intake and/or exhaust valves of the engine to interrupt the combustion cycle. In use, the “combustion interrupter” mechanism(s) actuate the intake and/or exhaust valves acco
Approaches to control engine overspeed are provided. Engine overspeed is controlled by one or more mechanisms that operate the intake and/or exhaust valves of the engine to interrupt the combustion cycle. In use, the “combustion interrupter” mechanism(s) actuate the intake and/or exhaust valves according to, for example, one or more control strategies in order to interrupt the combustion cycle and/or cause the engine to expend energy to move the pistons through a complete cycle in an aim to retard engine speed. The engine's cam(s) can include one or more sets of variable valve timing lobes that operate the intake and/or exhaust valves of the engine in order to, for example, interrupt the combustion cycle. The combustion interrupter mechanism can additionally or alternatively include one or more computer controlled actuators that operate the intake and/or exhaust valves in order, for example, to interrupt the combustion cycle.
대표청구항
▼
1. An engine overspeed system, comprising: a compression ignition engine having at least one combustion chamber defined by a cylinder, a piston operable to reciprocate within the cylinder, and at least one intake valve and at least one exhaust valve associated with the cylinder, the engine having an
1. An engine overspeed system, comprising: a compression ignition engine having at least one combustion chamber defined by a cylinder, a piston operable to reciprocate within the cylinder, and at least one intake valve and at least one exhaust valve associated with the cylinder, the engine having an engine cycle comprising an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke, wherein the intake valve is closed during the compression stroke;an engine overspeed suppression mechanism configured to move the exhaust valve between a valve open position in which gases may enter and/or exit from the combustion chamber and a closed position in which gases are inhibited from entering and/or exiting the combustion chamber; andat least one control component being in communication with the engine overspeed suppression mechanism, the at least one control component configured to cause the engine overspeed suppression mechanism to move the exhaust valve to the open position during at least a portion of the compression stroke, wherein the exhaust valve is in the open position for a duration capable of preventing sufficient compression for compression ignition. 2. The engine overspeed system of claim 1, wherein the at least one control component is further configured to cause the engine overspeed suppression mechanism to move the exhaust valve to the open position during the intake stroke. 3. The engine overspeed system of claim 2, wherein the engine overspeed suppression mechanism is further configured to move the intake valve between a valve open position in which gases may enter and/or exit from the combustion chamber and a closed position in which gases are inhibited from entering and/or exiting the combustion chamber, and wherein the at least one control component is further configured to cause the engine overspeed suppression mechanism to move the intake valve to the closed position during the intake stroke. 4. The engine overspeed system of claim 2, wherein the engine overspeed suppression mechanism is further configured to move the intake valve between a valve open position in which gases may enter and/or exit from the combustion chamber and a closed position in which gases are inhibited from entering and/or exiting the combustion chamber, and wherein the at least one control component is further configured to cause the engine overspeed suppression mechanism to move the intake valve to the closed position near below dead center (BDC) of the intake stroke. 5. The engine overspeed system of claim 1, wherein the engine overspeed suppression mechanism is further configured to move the intake valve between a valve open position in which gases may enter and/or exit from the combustion chamber and a closed position in which gases are inhibited from entering and/or exiting the combustion chamber, and wherein the at least one control component is further configured to cause the engine overspeed suppression mechanism to move the intake valve to the closed position during at least a portion of the intake stroke. 6. The engine overspeed system of claim 5, wherein the exhaust valve is closed during at least a portion of the intake stroke. 7. The engine overspeed system of claim 6, wherein at least one of the intake valve and the exhaust valve is opened around bottom dead center of the intake stroke. 8. The engine overspeed system of claim 7, wherein the at least one of the intake valve and the exhaust valve is closed just after bottom dead center of the intake stroke. 9. The engine overspeed system of claim 1, wherein the engine overspeed suppression mechanism includes at least one actuator controllable by the at least one control component and configured to move the exhaust valve between a valve open position and a valve closed position. 10. The engine overspeed system of claim 1, wherein the engine overspeed suppression mechanism includes a set of variable timing lobes and at least one actuator associated with the set of variable timing lobes and coupled in communication with the at least one control component. 11. The engine overspeed system of claim 1, wherein the engine overspeed suppression mechanism includes an actuator controllable by the at least one control component, the actuator being configured to move the exhaust valve between a valve open position in which gases may enter and/or exit from the combustion chamber and a closed position in which gases are inhibited from entering and/or exiting the combustion chamber. 12. An engine overspeed system, comprising: a compression ignition engine having at least one combustion chamber defined by a cylinder, a piston operable to reciprocate within the cylinder, and at least one intake valve and at least one exhaust valve associated with the cylinder, the engine having an engine cycle comprising an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke;an engine overspeed suppression mechanism that includes first and second controllable actuators, said first and second actuators configured to move the intake valve and the exhaust valve, respectively, between a valve open position in which gases may enter and/or exit from the combustion chamber and a closed position in which gases are inhibited from entering and/or exiting from the combustion chamber; andat least one control component being in communication with the engine overspeed suppression mechanism, the control component configured to cause the first actuator to move the intake valve to the closed position during the intake stroke and the compression stroke and configured to cause the second actuator to move the exhaust valve to the open position during at least one of the intake stroke, the compression stroke, and a second stage of the compression stroke so that compression ignition is suppressed. 13. The engine overspeed system of claim 12, wherein the at least one control component is further configured to cause the second actuator to move the exhaust valve to the open position during the intake stroke and the compression stroke. 14. The engine overspeed system of claim 12, wherein the at least one control component is further configured to cause the second actuator to move the exhaust valve to the open position during the intake stroke and the second stage of the compression stroke. 15. The engine overspeed system of claim 12, wherein at least one of the intake valve and the exhaust valve is opened around bottom dead center of the intake stroke, and wherein the at least one of the intake valve and the exhaust valve is closed just after bottom dead center of the intake stroke. 16. A method of suppressing an engine overspeed condition of a compression ignition engine, the engine having at least one combustion chamber defined by a cylinder, a piston operable to reciprocate within the cylinder, and at least one intake valve and at least one exhaust valve associated with the cylinder, the engine having an engine cycle comprising an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke, comprising: determining whether the engine is operating in an engine overspeed condition;operating an engine overspeed suppression mechanism when the engine is operating in the engine overspeed condition, wherein operating the engine overspeed suppression mechanism comprises: opening the exhaust valve during the intake stroke; andopening the exhaust valve during at least a portion of the compression stroke, wherein a portion of the compression stroke has a duration that prevents compression ignition. 17. The method of claim 16, wherein operating the engine overspeed suppression mechanism further comprises closing the intake valve during the intake stroke and the compression stroke. 18. The method of claim 17, wherein opening the exhaust valve during at least a portion of the compression stroke includes maintaining the exhaust valve in the open position during the compression stroke. 19. The method of claim 17, wherein opening the exhaust valve during at least a portion of the compression stroke includes closing the exhaust valve during a first stage of the compression stroke, and thereafteropening the exhaust valve during a second stage of the compression stroke. 20. A method of suppressing an engine overspeed condition of a compression ignition engine, the engine having at least one combustion chamber defined by a cylinder, a piston operable to reciprocate within the cylinder, and at least one intake valve and at least one exhaust valve associated with the cylinder, the engine having an engine cycle comprising an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke, comprising: determining whether the engine is operating in an engine overspeed condition;operating an engine overspeed suppression mechanism when the engine is operating in the engine overspeed condition, wherein operating the engine overspeed suppression mechanism comprises: closing the intake valve during the compression stroke;closing the exhaust valve during a first stage of the compression stroke, and thereafteropening the exhaust valve during a second stage of the compression stroke, wherein the second stage has a duration that suppresses compression ignition. 21. The method of claim 20, wherein operating the engine overspeed suppression mechanism further comprises closing the intake valve and the exhaust valve during a majority of the intake stroke; thereafteropening at least one of the intake valve and the exhaust valve around bottom dead center of the intake stroke; thereafterclosing the respective at least one of the intake valve and the exhaust valve just after bottom dead center of the intake stroke. 22. The method of claim 20, wherein operating the engine overspeed suppression mechanism further comprises opening the exhaust valve during the intake stroke. 23. The method of claim 20, wherein operating the engine overspeed suppression mechanism further comprises opening the exhaust valve during the intake stroke; andclosing the intake valve during the intake stroke. 24. The engine overspeed system of claim 1, wherein the compression stroke includes a first stage and a second stage, and wherein the exhaust valve is open during the second stage for a duration capable of preventing sufficient compression for compression ignition.
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