Hydraulic system with an actuator having independent meter-in meter-out control
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0406893
(1999-09-28)
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발명자
/ 주소 |
- Hajek, Jr., Thomas J.
- Triffaux, Vincent
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출원인 / 주소 |
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대리인 / 주소 |
Burrows, J. W.Hanley, Steve MBarnes, D James
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인용정보 |
피인용 횟수 :
8 인용 특허 :
9 |
초록
▼
A fluid circuit is provided to independently control the flow of fluid into and out of each end of an actuator. This is accomplished by having two different independently controlled valves controlling the flow of fluid into and out of one end of the actuator and by having two other independently con
A fluid circuit is provided to independently control the flow of fluid into and out of each end of an actuator. This is accomplished by having two different independently controlled valves controlling the flow of fluid into and out of one end of the actuator and by having two other independently controlled valves controlling the flow of fluid into and out of the other end of the actuator. Regeneration of the fluid flow from one end of the actuator to the other end of the actuator is provided by blocking the exhaust flow of fluid to the reservoir by one of the independently controlled valves and redirecting the flow across the other of the independently controlled valves to join with the flow of the pump that is being directed to the other end of the actuator. This arrangement permits a portion or all of the fluid from one end of the actuator to be regenerated to the other end of the actuator.
대표청구항
▼
A fluid circuit is provided to independently control the flow of fluid into and out of each end of an actuator. This is accomplished by having two different independently controlled valves controlling the flow of fluid into and out of one end of the actuator and by having two other independently con
A fluid circuit is provided to independently control the flow of fluid into and out of each end of an actuator. This is accomplished by having two different independently controlled valves controlling the flow of fluid into and out of one end of the actuator and by having two other independently controlled valves controlling the flow of fluid into and out of the other end of the actuator. Regeneration of the fluid flow from one end of the actuator to the other end of the actuator is provided by blocking the exhaust flow of fluid to the reservoir by one of the independently controlled valves and redirecting the flow across the other of the independently controlled valves to join with the flow of the pump that is being directed to the other end of the actuator. This arrangement permits a portion or all of the fluid from one end of the actuator to be regenerated to the other end of the actuator. stem of claim 7, wherein, when the working chamber pressure difference is greater than a first predetermined working pressure difference, the controller is configured to operate the valve assembly to zero a bleed flow from the working chamber to the tank. 9. The system of claim 7, wherein, when the non-working chamber pressure difference is greater than a first predetermined non-working pressure difference, the controller is configured to operate the valve assembly to decrease fluid flow from the non-working chamber to the tank. 10. The system of claim 7, wherein, when the non-working chamber pressure difference is less than a second non-working predetermined pressure difference, the controller is configured to operate the valve assembly to increase fluid flow from the non-working chamber to the tank. 11. The system of claim 6, wherein, when the working chamber pressure difference is less than a second predetermined working pressure difference, the controller is configured to operate the valve assembly to decrease fluid flow from the pump to the working chamber. 12. The system of claim 11, wherein, when the working chamber pressure difference is less than a second predetermined working pressure difference, the controller is configured to operate the valve assembly to increase a bleed flow from the working chamber to the tank, the increased bleed flow not exceeding a predetermined maximum bleed flow. 13. The system of claim 11, wherein, when the non-working chamber pressure difference is greater than a first predetermined non-working pressure difference, the controller is configured to operate the valve assembly to decrease fluid flow from the non-working chamber to the tank. 14. The system of claim 11, wherein, when the non-working chamber pressure difference is less than a second predetermined non-working pressure difference, the controller is configured to operate the valve assembly to increase fluid flow from the non-working chamber to the tank. 15. The system of claim 1, wherein the valve assembly includes a first valve configured to control fluid flow from the working chamber to the tank, a second valve configured to control fluid flow from the pump to the working chamber, a third valve configured to control fluid flow from the pump to the non-working chamber, and a fourth valve configured to control fluid flow from the non-working chamber to the tank, the first valve, the second valve, the third valve, and the fourth valve being individually controlled and operated. 16. A method for controlling a hydraulic system, comprising: receiving an input command indicative of a desired movement of the hydraulic system; generating a desired working pressure value relating to a working chamber of an actuator based on the input command; generating a desired pressure value relating to a non-working chamber of the actuator based on the input command; controlling a flow condition of the working chamber as a function of a pressure condition of the working chamber; and controlling a flow condition from the non-working chamber to the tank as a function of a pressure condition of the non-working chamber. 17. The method of claim 16, wherein said controlling a flow condition of the working chamber includes selectively and controllably operating independent valves to adjust fluid provided to the respective working chamber. 18. The method of claim 16, wherein said controlling a flow condition from the non-working chamber includes selectively and controllably operating independent valves to adjust fluid exiting the non-working chamber. 19. The method of claim 16, further including positioning an operating lever, the lever being configured such that a position of the lever corresponds with the desired working pressure value. 20. The method of claim 16, further including positioning an operating lever, the lever being configured such that a position of the lever corresponds with the desired pressure value relating to the non-working chamb
이 특허에 인용된 특허 (9)
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Krone John J. ; Qian Yaoxin, Control scheme for pressure relief.
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Kramer Kenneth D. (Waterloo IA) Fletcher Edward H. (Waterloo IA), Electrohydraulic valve system.
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Lonnemo Kurt R. (Searcy AR), Hydraulic control system.
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Andersson Bo (Junistigen 10 S-931 52 SkellefteSEX), Hydraulic motor with inlet fluid supplemented by fluid from contracting chamber.
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Uehara Kazuo (Tokyo JPX) Karakama Tadao (Kawasaki JPX) Nunotani Sadao (Hiratsuka JPX) Ishizaki Naoki (Kamakura JPX) Tanaami Masayuki (Kawasaki JPX), Hydraulic pressure control system.
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Andersson Bo (11 Venusvgen Ljungsbro S-590 60 SEX), Hydraulic valve means.
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Schexnayder Lawrence F. (Joliet IL), Poppet valve with force feedback control.
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Schwelm Hans (Luxembourg-Dommeldange LUX), Proportional seat-type 4-way valve.
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Marklund Erland (SkellefteSEX), Valve arrangement for controlling a pressure medium flow through a line of pressure medium.
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Post, Karl-Heinz; Wheeler, Michael N.; Wheeler, Sr., Richard G.; Weber, Robert, Hydraulic switching mechanism for mobile hydraulics, mobile hydraulic machine and valve unit.
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Brickner, Chad Timothy, Hydraulic system having regeneration modulation.
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Hajek, Jr.,Thomas J.; Triffaux,Vincent, Hydraulic system with an actuator having independent meter-in meter-out control.
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Graeve, Joshua D., Independent supply and exhaust metering within a valve casting.
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Underwood,Fred R.; Hicks,Charles, Water treatment control system.
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