For controlling motion of a movable part, a device comprises a first chamber and a second chamber in fluid communication with each other via a variable orifice that is responsive to pressure within the first chamber. Movement of the movable part is thereby at least partially controlled by flow of a
For controlling motion of a movable part, a device comprises a first chamber and a second chamber in fluid communication with each other via a variable orifice that is responsive to pressure within the first chamber. Movement of the movable part is thereby at least partially controlled by flow of a fluid from the first chamber to the second chamber via the variable orifice. An increase in pressure in the first chamber may cause an increase in orifice area, whereas a decrease in pressure may cause a decrease in the orifice area. Pressure-dependent elements that change geometries and/or the pressure-based opening/closing of one or more bypass channels may be used for this purpose. Where bypass channels are used, a valve may be opened/closed based on an operating parameter of a system in which the movable part is a component. Such a system may comprise an internal combustion engine.
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1. A device for controlling motion of a movable part, the movable part being a component of a system, the device comprising: a first chamber configured to be operatively connected to the movable part;a second chamber; anda variable orifice providing fluid communication between the first chamber and
1. A device for controlling motion of a movable part, the movable part being a component of a system, the device comprising: a first chamber configured to be operatively connected to the movable part;a second chamber; anda variable orifice providing fluid communication between the first chamber and the second chamber, an orifice area of the variable orifice being responsive to pressure within the first chamber,wherein motion of the movable part is at least partially controlled by flow of a fluid from the first chamber to the second chamber through the variable orifice. 2. The device of claim 1, wherein the orifice area is increased responsive to an increase in pressure within the first chamber and decreased responsive to a decrease in pressure within the first chamber. 3. The device of claim 1, wherein the variable orifice is defined by a pressure-dependent element that changes geometry responsive to the pressure within the first chamber. 4. The device of claim 1, wherein the variable orifice comprises a bypass channel providing fluid communication between the first chamber and the second chamber and that is opened or closed responsive to the pressure within the first chamber. 5. The device of claim 1, wherein the variable orifice exhibits a hysteretic response to changes in the pressure within the first chamber. 6. The device of claim 1, further comprising: a housing having a bore formed therein;a piston slidably disposed within the bore and arranged to communicate with the movable part; anda separator disposed within the housing and defining the first chamber between the piston and the separator and the second chamber between the housing and the separator, the separator comprising the variable orifice between the first chamber and the second chamber. 7. The device of claim 6, wherein the variable orifice of the separator comprises a pressure-sensitive valve having an inlet port open to the first chamber and an outlet port open to the second chamber, the pressure-sensitive valve configured to open when the pressure within the first chamber exceeds a threshold. 8. The device of claim 7, wherein the pressure-sensitive valve is disposed within a disc forming a component of the separator. 9. The device of claim 7, wherein the pressure-sensitive valve is arranged to control flow through a bypass channel providing fluid communication between the first chamber and the second chamber, the bypass channel being formed entirely within the housing. 10. The device of claim 6, the separator further comprising: a disc, disposed within the bore of the housing, have a central bore; anda pin, slidably maintained by the piston within the central bore,wherein surface features of the pin cooperate with the central bore to provide at least a portion of the variable orifice. 11. The device of claim 10, wherein the pin comprises a longitudinally variable surface configured to selectively occlude the central bore, wherein the disc is movable responsive to the pressure in the first chamber and to further selectively occlude the central bore relative to the longitudinally variable surface of the pin. 12. The device of claim 10, wherein the pin comprises an internal hydraulic passage and a plurality of radial holes configured to be selectively occluded by the disc, wherein the internal hydraulic passage is in fluid communication with the first chamber and the second chamber. 13. The device of claim 10, wherein the disc comprises a flexible element that varies thickness of the disc relative to the pressure in the first chamber. 14. The device of claim 10, wherein the separator assembly further comprises: a movable disc seat disposed within the bore of the housing between the disc and a portion of the housing defining the second chamber; anda compressible member disposed within the second chamber providing a bias force to maintain the movable disc seat in an extended position,wherein the pressure in the first chamber can overcome the bias force to move the movable disc seat, via the disc, to a retracted position. 15. An internal combustion engine comprising the device of claim 1, wherein the movable part is an engine valve. 16. A device for controlling motion of a movable part, the movable part being a component of a system, the device comprising: a housing having a bore and a bypass channel formed entirely within the housing;a piston slidably disposed within the bore and arranged to communicate with the movable part; anda separator disposed within the housing and defining a first chamber between the piston and the separator and a second chamber between the housing and the separator, the bypass channel forming at least a portion of a variable orifice providing fluid communication between the first chamber and the second chamber,wherein the separator further comprises a valve controlling fluid flow through the bypass channel having an inlet port open to the first chamber and an outlet port open to the second chamber, the valve controlled according to an operating parameter of the system,and wherein motion of the movable part is at least partially controlled by the piston and flow of a fluid from the first chamber to the second chamber through the variable orifice. 17. The device of claim 16, wherein the valve comprises an hydraulically controlled spool valve. 18. The device of claim 16, wherein the valve comprises a solenoid valve. 19. The device of claim 16, the separator further comprising: a disc, disposed within the bore of the housing, have a central bore; anda pin, slidably maintained by the piston within the central bore,wherein surface features of the pin cooperate with the central bore to provide at least a portion of the variable orifice. 20. The device of claim 19, wherein the pin comprises a longitudinally variable surface configured to selectively occlude the central bore. 21. The device of claim 19, wherein the pin comprises an internal hydraulic passage and a plurality of radial holes configured to be selectively occluded by the disc, wherein the internal hydraulic passage is in fluid communication with the first chamber and the second chamber. 22. An internal combustion engine comprising the device of claim 16, wherein the movable part is an engine valve. 23. The internal combustion engine of claim 22, wherein the operating parameter is any one parameter or combination of parameters selected from a group of parameters comprising: speed of the engine, a load placed on the engine, temperature of the engine, oil pressure within the engine, and throttle position of the engine. 24. A device for controlling motion of an engine valve within an internal combustion engine, the device comprising: a housing having a bore and a bypass channel formed entirely within the housing;a piston slidably disposed within the bore and arranged to communicate with the engine valve;a separator disposed within the housing and defining a first chamber between the piston and the separator and a second chamber between the housing and the separator, the bypass channel forming at least a portion of a variable orifice providing fluid communication between the first chamber and the second chamber; anda bypass valve, supported by the housing and arranged to control fluid flow through the bypass channel, the bypass valve controlled according to an operating parameter of the engine,wherein motion of the engine valve is at least partially controlled by the piston and flow of a fluid from the first chamber to the second chamber through the variable orifice. 25. The internal combustion engine of claim 24, wherein the operating parameter is any one parameter or combination of parameters selected from a group of parameters comprising: speed of the engine, a load placed on the engine, temperature of the engine, oil pressure within the engine, and throttle position of the engine. 26. The device of claim 24, wherein the bypass valve comprises an hydraulically controlled spool valve. 27. The device of claim 26, the housing comprising at least one port providing fluid communication between at least one external fluid source and at least one end of the spool valve. 28. The device of claim 24, wherein the bypass valve comprises a solenoid valve. 29. A system comprising a movable part, and further comprising: a plurality of devices for controlling motion of a corresponding movable part, each of the plurality of devices comprising: a housing having a bore and a bypass channel formed entirely within the housing;a piston slidably disposed within the bore and arranged to communicate with the corresponding movable part;a separator disposed within the housing and defining a first chamber between the piston and the separator and a second chamber between the housing and the separator, the bypass channel forming at least a portion of a variable orifice providing fluid communication between the first chamber and the second chamber,wherein the separator further comprises an hydraulically controlled spool valve controlling fluid flow through the bypass channel having an inlet port open to the first chamber and an outlet port open to the second chamber, the valve controlled according to an operating parameter of the system,and wherein motion of the corresponding movable part is at least partially controlled by the piston and flow of a fluid from the first chamber to the second chamber through the variable orifice; andat least one actuator in hydraulic communication with the spool valve of at least one of the plurality of devices.
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이 특허에 인용된 특허 (14)
Sun, Zongxuan, Engine valve actuation control and method.
Vattaneo,Francesco; Micelli,Damiano; Vafidis,Costantinos; Saretto,Roberto, Internal combustion engine with valves with variable actuation which are driven by a single pumping piston and controlled by a single solenoid valve for each engine cylinder.
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