IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
|
출원번호 |
US-0259599
(2002-09-30)
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발명자
/ 주소 |
- Nan, Xinshuang
- Cornell, Sean Olen
- Leman, Scott Alan
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출원인 / 주소 |
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대리인 / 주소 |
Finnegan, Henderson, Farabow, Garrett &
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인용정보 |
피인용 횟수 :
5 인용 특허 :
6 |
초록
▼
An engine valve actuation system may include an actuation assembly having a body, a slidable piston, and first, second, and third chambers defined between the piston and the body. Low pressure and high pressure fluid sources may be included. A first fluid passage may connect the low pressure fluid s
An engine valve actuation system may include an actuation assembly having a body, a slidable piston, and first, second, and third chambers defined between the piston and the body. Low pressure and high pressure fluid sources may be included. A first fluid passage may connect the low pressure fluid source to the second chamber. A second fluid passage may connect the high pressure fluid source to the second chamber, and a third fluid passage may connect the high pressure fluid source to the third chamber. A control valve may be connected to the low pressure fluid source, to the high pressure fluid source, and to the first chamber. The control valve may be configured to move between a first position at which the high pressure fluid source is connected to the first chamber, and a second position at which the low pressure fluid source is connected to the first chamber.
대표청구항
▼
1. An engine valve actuation system, comprising:an actuation assembly having a body, a piston slidable relative to the body, and first, second, and third chambers defined between the piston and the body; a low pressure fluid source; a first fluid passage configured to connect the low pressure fluid
1. An engine valve actuation system, comprising:an actuation assembly having a body, a piston slidable relative to the body, and first, second, and third chambers defined between the piston and the body; a low pressure fluid source; a first fluid passage configured to connect the low pressure fluid source to the second chamber; a high pressure fluid source; a second fluid passage configured to connect the high pressure fluid source to the second chamber to allow the fluid to flow from the second chamber to the high pressure fluid source; a third fluid passage configured to connect the high pressure fluid source to the third chamber; and a control valve connected to the low pressure fluid source, to the high pressure fluid source, and to the first chamber, the control valve configured to move between a first position at which the high pressure fluid source is connected to the first chamber and a second position at which the low pressure fluid source is connected to the first chamber. 2. The system of claim 1, further comprising first and second check valves disposed within the first and second fluid passages, respectively, the first check valve configured to block the flow of fluid from the second chamber to the low pressure fluid source and the second check valve configured to block the flow of fluid from the high pressure fluid source to the second chamber.3. The system of claim 2, further including a valve stem connected to the piston, the valve stem connected to a valve element.4. The system of claim 3, further including a spring to bias the piston relative to the body such that the valve element is biased in a closed position.5. The system of claim 2, wherein the piston is connected to a valve bridge to actuate a plurality of valve elements.6. The system of claim 1, wherein the first and second chambers have volumes that increase and the third chamber has a volume that decreases in response to the piston moving relative to the body in a first direction, and the piston includes a first surface area associated with the first chamber, a second surface area associated with the second chamber, and a third surface area associated with the third chamber.7. The system of claim 6, wherein the first surface area is greater than the third surface area, and the third surface area is greater than the second surface area.8. The system of claim 1, wherein the piston includes a first member and a second member, the second member being linearly movable relative to the first member.9. The system of claim 8, wherein the volumes of the first and second chambers increase and the volume of the third chamber decreases in response to the piston moving relative to the body in a first direction, wherein the piston includes a first surface area associated with the first chamber, a second surface area associated with the second chamber, and a third surface area associated with the third chamber, and wherein the first surface area includes first and second member surface areas associated with the first and second members, respectively.10. The system of claim 9, wherein the first member and the second member move together in response to the piston moving in the first direction until the second member engages a stop.11. The system of claim 1, wherein the control valve includes a spool valve actuated by a pilot valve.12. The system of claim 1, wherein the piston is in a first position in response to the second chamber being at a minimum volume, and wherein the second fluid passage is substantially blocked in response to the piston being in the first position.13. The system of claim 12, wherein the second fluid passage is substantially blocked by the piston in response to the piston approaching the first position.14. A method to operate a valve actuation system, the valve actuation system having a piston, a body, first, second, and third chambers defined between the piston and the body, a low pressure fluid source selectively connected to the first and second chambers, and a high pressure fluid source selectively connected to the first and second chambers and connected to the third chamber, the method comprising:providing the piston in a first position such that the volume of the second chamber is minimized; passing a flow of fluid from the high pressure fluid source to the first chamber; moving the piston in the first direction; passing fluid from the third chamber to the high pressure fluid source in response to the pressure in the third chamber exceeding the pressure in the high pressure fluid source; and passing fluid from the low pressure fluid source into the second chamber in response to the pressure in the second chamber being less than the pressure in the low pressure fluid source. 15. The method of claim 14, further comprising:stopping the flow of fluid from the high pressure fluid source into the first chamber; passing fluid from the first chamber into the low pressure fluid source; moving the piston in a second direction opposite the first direction; and passing fluid from the second chamber to the high pressure fluid source in response to the pressure in the second chamber exceeding the pressure in the high pressure fluid source. 16. The method of claim 15, further including substantially blocking the second fluid passage in response to the piston being substantially in the first position.17. The method of claim 16, further including passing fluid from the second chamber to the first chamber via flow between the piston and the body.18. The method of claim 14, wherein the piston includes a first member and a second member, the second member being linearly movable relative to the first member, and further including:passing fluid from the high pressure fluid source to the first chamber; moving the first and second members together with a first force in the first direction until the second member engages a stop; and moving the first member relative to the second member in the first direction with a second force, which is less than the first force. 19. A method to recover energy in an engine valve actuation system connected to a high pressure fluid source, the engine valve actuation system including a body, a piston capable of moving relative to the body, and first, second, and third volumes defined between the piston and the body, the method comprising:moving the piston relative to the body in a first direction in response to passing fluid from the high pressure fluid source to the first volume; passing fluid from the second volume to the high pressure fluid source in response to moving the piston relative to the body in the first direction; moving the piston relative to the body in a second direction opposite the first direction in response to draining fluid from the first volume and passing fluid from the high pressure fluid source to the second volume; and passing fluid from the third volume defined between the piston and the body into the high pressure fluid source in response to moving the piston relative to the body in the second direction. 20. The method of claim 19, wherein draining fluid from the first volume includes passing fluid from the first volume into a low pressure fluid source.21. A method to control a closing force of a valve in an engine valve actuation system connected to a high pressure fluid source, the engine valve actuation system including a body, a piston capable of moving relative to the body, and first, second, and third volumes defined between the piston and the body, the method comprising:moving the piston relative to the body in a valve-closing direction in response to passing fluid from the high pressure fluid source into the first volume; decreasing the closing force of the valve in response to increasing the pressure in a second volume; passing fluid from the second volume to the high pressure fluid source in response to the pressure in the second volume exceeding the pressure in the high pressure fluid source; further decreasing the closing force of the valve in response to blocking the passing of fluid from the second volume to the high pressure fluid source; and decreasing the pressure in the second volume in response to passing fluid from the second volume to the third volume defined between the piston and the body.
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