Systems and methods of actuating two engine valves associated with a common engine cylinder using one or more lost motion systems and one or more control valves are disclosed. The control valves are capable of selectively trapping hydraulic fluid in the lost motion systems for auxiliary engine valve
Systems and methods of actuating two engine valves associated with a common engine cylinder using one or more lost motion systems and one or more control valves are disclosed. The control valves are capable of selectively trapping hydraulic fluid in the lost motion systems for auxiliary engine valve actuations and selectively releasing the hydraulic fluid to default to cam controlled valve seating of the engine valves. The systems may provide a combination of main exhaust, compression release, exhaust gas recirculation and early exhaust valve opening in preferred embodiments.
대표청구항▼
What is claimed is: 1. A system for actuating at least two engine valves of the same type in an internal combustion engine wherein engine valves of the same type are selected from the types consisting of intake valves, exhaust valves and auxiliary valves, comprising: a first master piston and slave
What is claimed is: 1. A system for actuating at least two engine valves of the same type in an internal combustion engine wherein engine valves of the same type are selected from the types consisting of intake valves, exhaust valves and auxiliary valves, comprising: a first master piston and slave piston lost motion system adapted to actuate a first engine valve in a first engine cylinder; a second master piston and slave piston lost motion system adapted to actuate a second engine valve in the first engine cylinder; a control valve in hydraulic communication with the first and second master piston and slave piston lost motion systems; a hydraulic fluid accumulator in hydraulic communication with the control valve when the control valve is in a first position; and means for clipping motion of the first master piston and slave piston lost motion system when the control valve is in a second position, said means for clipping motion including a clipping passage extending to an ambient. 2. The system of claim 1 wherein the control valve is a trigger valve. 3. The system of claim 2 further comprising a hydraulic fluid supply in hydraulic communication with the trigger valve. 4. The system of claim 3 further comprising a hydraulic fluid supply passage extending between the hydraulic fluid supply and the first master piston and slave piston lost motion system. 5. The system of claim 1 wherein the first master piston and slave piston lost motion system comprises a first master piston slidably disposed within a first slave piston. 6. The system of claim 5 wherein the second master piston and slave piston lost motion system comprises a second master piston slidably disposed within a second slave piston. 7. The system of claim 1 further comprising means for clipping motion of the second master piston and slave piston lost motion system. 8. The system of claim 1 further comprising: means for controlling the first master piston and slave piston lost motion system to provide compression release engine braking through the first engine valve; and means for controlling the second master piston and slave piston lost motion system to provide early exhaust valve opening through the second engine valve. 9. The system of claim 8 wherein early exhaust valve opening is provided in response to an engine parameter selected from the group consisting of: engine speed and engine load. 10. A system for actuating at least two engine valves of the same type in an internal combustion engine wherein engine valves of the same type are selected from the types consisting of intake valves, exhaust valves and auxiliary valves, comprising: a housing having a hydraulic fluid supply passage; a first hydraulic lost motion system disposed in said housing and adapted to contact a first engine valve in an engine cylinder; a second hydraulic lost motion system disposed in said housing and adapted to contact a second engine valve in the engine cylinder; a hydraulic control valve disposed in said housing between the (i) hydraulic fluid supply passage and (ii) the first and second hydraulic lost motion systems; a hydraulic fluid accumulator in hydraulic communication with the control valve when the control valve is in a first position; and means for clipping motion of the first master piston and slave piston lost motion system when the control valve is in a second position, said means for clipping motion including a clipping passage extending to an ambient. 11. The system of claim 10 wherein the control valve is a trigger valve. 12. The system of claim 10 wherein the first hydraulic lost motion system comprises: a master piston disposed in a fixed master piston bore; a slave piston disposed in a fixed slave piston bore; and a hydraulic passage connecting the master piston bore to the slave piston bore. 13. The system of claim 10, further comprising: means for imparting a compression release valve actuation motion to the first hydraulic lost motion system; and means for imparting an early exhaust valve opening valve actuation motion to the second hydraulic lost motion system. 14. The system of claim 13, further comprising: means for imparting an exhaust gas recirculation valve actuation motion to the first hydraulic lost motion system. 15. A system for actuating at least two engine valves in an internal combustion engine, said system comprising: a housing having a central opening and hydraulic passages extending to a master piston bore and a slave piston bore, respectively; a valve bridge adapted to extend between engine valves, said valve bridge having a central guide member extending through the housing central opening and a hydraulic passage extending through the central guide member; a sliding pin extending through the valve bridge and adapted to contact one of the engine valves; a master piston disposed in the master piston bore; a slave piston disposed in the slave piston bore and contacting the sliding pin; and a control valve communicating with the hydraulic passage extending to the slave piston bore. 16. The system of claim 15, wherein the control valve is a high speed trigger valve. 17. The system of claim 16, wherein (i) the hydraulic passages extending to the master piston bore and the slave piston bore and (ii) the hydraulic passage extending through the central guide member are adapted to selectively register with one another to provide selective hydraulic fluid flow between them. 18. The system of claim 17 further comprising one or more hydraulic fluid passages extending through the slave piston. 19. The system of claim 18, wherein the one or more hydraulic fluid passages extending through the slave piston communicate with an annular recess provided in a side wall of the slave piston, and wherein the annular recess is selectively sized to limit the travel of the slave piston in the slave piston bore. 20. The system of claim 15 further comprising a central bore in the lower portion of the valve bridge which is adapted to receive a guide pin. 21. The system of claim 15, wherein (i) the hydraulic passages extending to the master piston bore and the slave piston bore and (ii) the hydraulic passage extending through the central guide member are adapted to selectively register with one another to provide selective hydraulic fluid flow between them. 22. The system of claim 15 further comprising one or more hydraulic fluid passages extending through the slave piston. 23. The system of claim 22, wherein the one or more hydraulic fluid passages extending through the slave piston communicate with a annular recess provided in a side wall of the slave piston, and wherein the annular recess is selectively sized to limit the travel of the slave piston in the slave piston bore. 24. A system for actuating at least two engine valves in an internal combustion engine, said system comprising: a housing having a central opening and hydraulic passages extending from said central opening to a first master piston bore and a slave piston bore, respectively; a valve bridge adapted to extend between engine valves, said valve bridge having a central guide member extending through the housing central opening, a second master piston bore provided an upper end of the central guide member, and a hydraulic passage extending through the central guide member and communicating with the second master piston bore; a sliding pin extending through the valve bridge and adapted to contact one of the engine valves; a first master piston disposed in the first master piston bore; a second master piston disposed in the second master piston bore; a slave piston disposed in the slave piston bore and contacting the sliding pin; and a control valve communicating with the hydraulic passage extending to the slave piston bore. 25. The system of claim 24, wherein the control valve is a high speed trigger valve. 26. The system of claim 25, wherein (i) the hydraulic passages extending to the master piston bore and the slave piston bore and (ii) the hydraulic passage extending through the central guide member are adapted to selectively register with one another to provide selective hydraulic fluid flow between them. 27. The system of claim 26 further comprising one or more hydraulic fluid passages extending through the slave piston. 28. The system of claim 27, wherein the one or more hydraulic fluid passages extending through the slave piston communicate with an annular recess provided in a side wall of the slave piston, and wherein the annular recess is selectively sized to limit the travel of the slave piston in the slave piston bore. 29. The system of claim 24 further comprising a central bore in the lower portion of the valve bridge which is adapted to receive a guide pin. 30. The system of claim 24, wherein (i) the hydraulic passages extending to the master piston bore and the slave piston bore and (ii) the hydraulic passage extending through the central guide member are adapted to selectively register with one another to provide selective hydraulic fluid flow between them. 31. The system of claim 24 further comprising one or more hydraulic fluid passages extending through the slave piston. 32. The system of claim 31, wherein the one or more hydraulic fluid passages extending through the slave piston communicate with a annular recess provided in a side wall of the slave piston, and wherein the annular recess is selectively sized to limit the travel of the slave piston in the slave piston bore. 33. A method of actuating two engine valves of the same type associated with a common engine cylinder using first and second lost motion systems and a common control valve wherein engine valves of the same type are selected from the types consisting of intake valves, exhaust valves and auxiliary valves, comprising the steps of: providing hydraulic fluid to the first lost motion system during a first engine operating mode; selectively maintaining hydraulic fluid in the first lost motion system under the control of the common control valve during the first engine operating mode; providing hydraulic fluid to the second lost motion system during a second engine operating mode; and selectively maintaining hydraulic fluid in the second lost motion system under the control of the common control valve during the second engine operating mode. 34. The method of claim 33 wherein hydraulic fluid is selectively released from the first lost motion system under the control of the common control valve during the second engine operating mode. 35. The method of claim 33 wherein the first engine operating mode is an engine braking mode. 36. The method of claim 35 wherein the second engine operating mode is an early exhaust valve opening mode.
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이 특허에 인용된 특허 (3)
Vanderpoel, Richard E.; Schwoerer, John A.; Mossberg, Jeffrey; Huang, Shengqiang, Compact lost motion system for variable valve actuation.
Vorih, Joseph M.; Mossberg, Jeffrey; Vanderpoel, Richard; Ernest, Steven; Paterson, Guy; Schwoerer, John A.; Leitkowski, Edward T.; Brzoska, Andrew; Cosma, Gheorghe, Variable lost motion valve actuator and method.
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