[특허]Positive flow control system

[미국특허] Positive flow control system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F16D-031/02
출원번호	US-0976152 (1997-11-21)
발명자 / 주소	Cobo Michael A. Ingram Richard G. Reiners Eric A. Vande Wiele Matthew F.
출원인 / 주소	Caterpillar Inc.
대리인 / 주소	Burrows
인용정보	피인용 횟수 : 15 인용 특허 : 16

초록 ▼

A positive flow control system is provided that uses open-centered control valves in a series connection to provide priority between different fluid circuits and to provide requested flow regardless of the load pressure while minimizing unused or wasted flow. This is accomplished by providing a restriction in the last open-centered control valve to controllably restrict the flow therethrough when the valve is in its neutral position and having the source of pressurized fluid at a minimum displacement position that substantially matches the rate of flow across the restriction. A controller controls the displacement of the source of pressurized fluid and the displacement of the respective open-centered control valves in proportional to the respective input commands. Initial movement of the last open-centered control valve closes off the restricted flow thereacross to the reservoir prior to the source of pressurized fluid being communicated to the associated actuator. The subject system provides priority control and an effective control of wasted fluid while providing the needed flow rate regardless of the load without needing a special control arrangement for priority or separate bypass valve to control wasted flow.

대표청구항 ▼

[ We claim:] [1.] A positive flow control system comprising:a variable displacement source of pressurized fluid having a displacement controller and being movable from a minimum displacement position towards a maximum displacement position in response to receipt of a control signal to the displacement controller;a first fluid circuit connected to the source of pressurized fluid, the first fluid circuit having a first actuator and a first open-centered control valve connected to the source of pressurized fluid and operative to control the flow of fluid from the source of pressurized fluid to the first actuator, the first open-centered control valve is movable from a neutral position, at which flow to the first actuator is blocked and flow through a bypass passage connecting the pump and the reservoir is open, towards first and second operative positions at which the flow towards the reservoir is progressively closed off and the flow to the first actuator is progressively opened;a second fluid circuit connected to the first fluid circuit downstream thereof, the second fluid circuit having a second actuator and a second open-centered control valve connected to the source of pressurized fluid and operative to control the flow of fluid from the source of pressurized fluid to the second actuator, the second open-centered control valve is movable from a neutral position, at which flow to the second actuator is blocked and flow towards the reservoir is controllably restricted, towards first and second operative positions at which the flow towards the reservoir is initially substantially closed off and the flow to the second actuator is progressively opened;first and second input lever controllers operative to selectively generate control signals to control the displacement of the respective first and second open-centered control valves; andan electronic controller operative to receive the signals from the first and second input lever controllers and generate command signals to the displacement controller of the source of pressurized fluid and to the first and second open-centered control valves.

이 특허에 인용된 특허 (16) 인용/피인용 타임라인 분석

Fischer Gnter (Gemnden DEX) Knll Rainer (Burgsinn DEX), Closed loop control circuit for variable hydraulic pump.
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Deininger Horst (Hoerstein/Alzenau DEX) Kleineisel Gustav (Mainaschaff DEX) Richter Rudolf (Hoesbach DEX), Control device for a variable displacement hydrostatic machine.
상세보기
Roth Dieter (Schlchtern DEX) Erkkil Mikko (Horb/Neckar DEX), Hydraulic control apparatus for a plurality of users.
상세보기
Westveer Robert C. (Kalamazoo MI), Hydraulic control system.
상세보기
Westveer Robert C. (Kalamazoo MI), Hydraulic control system.
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Westveer Robert C. (Kalamazoo MI), Hydraulic control system.
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Tanaka Hirohisa (Tokyo JPX) Oshina Morio (Ibaraki-ken JPX) Kanai Takashi (Kashiwa JPX) Tanaka Atsushi (Tsuchiura JPX), Hydraulic drive system.
상세보기
Yasuda Tomohiko (Kashiwa JPX) Aoyagi Yukio (Ibaraki JPX), Hydraulic drive system for construction machine.
상세보기
Hirata Toichi (Ushiku JPX) Sugiyama Genroku (Ibaraki JPX) Ishikawa Koji (Ibaraki JPX) Ochiai Masami (Atsugi JPX), Hydraulic drive system for hydraulic working machines.
상세보기
Ishikawa Koji (Ibaraki JPX) Hirata Toichi (Ushiku JPX) Sugiyama Genroku (Ibaraki JPX), Hydraulic drive system for hydraulic working machines.
상세보기
Aoyagi Yukio (Ibaraki JPX) Yasuda Tomohiko (Kashiwa JPX), Hydraulic drive system with pressure compensting valve.
상세보기
Hirata Toichi (Ushiku JPX) Sugiyama Genroku (Ibaraki-ken JPX) Watanabe Hiroshi (Ushiku JPX) Yoshinaga Shigehiro (Ibaraki-ken JPX), Hydraulic pump control system.
상세보기
Hopkins Delaney C. (Dwight IL) Vocu James L. (Joliet IL), Pilot control circuit with preselected actuation delays.
상세보기
Budzich Tadeusz (Moreland Hills OH), Priority flow control system.
상세보기
Hadank John M. (Dunlap IL) Creger Todd D. (Peoria IL), Proportional valve control apparatus for fluid systems.
상세보기
Graf Kevin J. (Eden Prairie MN) Hastreiter James J. (Eden Prairie MN) Anderson Duane A. (Edina MN), Solenoid valve control system for hydrostatic transmission.
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이 특허를 인용한 특허 (15) 인용/피인용 타임라인 분석

Coombs, Jason R.; St. Aubin, Joseph A.; Lacher, Jonathan J.; Koch, Rodney, Control valve assembly.
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Coombs, Jason R.; St. Aubin, Joseph A.; Lacher, Jonathan J.; Koch, Rodney, Control valve assembly.
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Lin, Hong-Chin; Haggag, Salem, Dual mode hydraulic circuit control and method.
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Li, Suxiang; Dunlap, Peter Girard; Zhuang, Zhouheng; Lee, Tzongyu Paul; Zhang, Le, High throughput flow control.
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Anderson, Charles D.; Sanning, David J., Hydraulic actuation system for work machine.
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Naoyuki Moriya JP; Hideto Furuta JP, Hydraulic control device for working machines.
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Krajnik, Andrew J.; Sullivan, Jr., Patrick W., Hydraulic control system utilizing feed-forward control.
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Wagers, Jesse, Hydraulic displacement control system.
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Lin, Hong-Chin; Dantuluri, Venkata Rama Varma, Hydraulic implement system having boom priority.
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St-Yves, Jean-Francois, Hydraulic system for extreme climates.
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VerKuilen,Michael Todd; Tozawa,Shoji, Hydraulic system having area controlled bypass.
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VerKuilen,Michael T.; Egelja,Aleksandar M., Hydraulic system having pressure compensated bypass.
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Gradea, Tudor, Hydraulic system with variable standby pressure.
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Rockwood Brian D., Method and system for controlling fluid flow in an electrohydraulic system having multiple hydraulic circuits.
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Roche Richard M., Open center hydraulic system with reduced interaction between branches.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Positive flow control system 원문보기