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특허 상세정보

Hydraulic actuator controls

국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) F15B-011/10    F15B-013/043   
미국특허분류(USC) 91/433
출원번호 US-0511739 (1974-10-03)
우선권정보 UK-0047213 (1973-10-10)
발명자 / 주소
출원인 / 주소
인용정보 피인용 횟수 : 18  인용 특허 : 0
초록

A device for controlling a hydraulic actuator comprises two servo loops having in common a fluid pressure operated main valve and an electrically operated pilot valve for controlling the main valve. One of the servo loops is for flow control and contains a flow transducer for producing an electrical feedback signal responsively to fluid flow to the actuator and a comparator for comparing the flow feedback signal with a first electrical input signal. The other servo loop is for force control and contains pressure transducing means for producing an electri...

대표
청구항

In combination with hydraulic actuator means, a device for controlling the flow of fluid to said hydraulic actuator means, said device comprising a fluid pressure operated main valve for regulating the fluid flow to the actuator means; via service lines a pilot valve for controlling the main valve via control lines, said pilot valve including electrical operating means; electrical input means for an electrical input signal; flow sensing means for producing an electrical feedback signal dependent on the rate of fluid flow to the actuator means, said flow ...

이 특허를 인용한 특허 피인용횟수: 18

  1. Schivley ; Jr. George P. (Bridgeport WV) Madonna Peter L. (Dover NJ). Automatic control system for rock drills. USP1981064275793.
  2. Wiklund, David E.; Krouth, Terrance F.; Broden, David A.; Schumacher, Mark S.. Bi-directional differential pressure flow sensor. USP2004046725731.
  3. Reinhardt Peter (Lohr DEX). Electrical measured value processing for a control valve. USP1990114970941.
  4. Ziplies Herbert (Kamen DEX) Pyschik Werner (Dortmund DEX). Electrically controlled pipe fracture safety device. USP1980114232588.
  5. Walters Ronald B. (Wembley GB2) Hammond John A. G. (Hayling Island GB2). Feedback controlled hydraulic valve system. USP1986074598626.
  6. Krouth, Terrance F.; Wiklund, David E.; Habegger, Richard J.; Hineman, Richard R.. Hydraulic actuator piston measurement apparatus and method. USP2005026848323.
  7. Hassler Hubert (Zug CHX). Hydraulic control system. USP1980064205592.
  8. Moretti Luciano (Turin ITX) Dotti Giulio (Turin ITX). Hydraulic distributor. USP1983034376453.
  9. Hasegawa, Kisaku. Hydraulic elevator. USP1985104548296.
  10. Brown, Gregory C.; Richter, Brian E.. Hydraulic piston position sensor. USP2003076588313.
  11. Walters Ronald B. (Wembley GB2). Hydraulic valves with dual feedback control. USP1987014635682.
  12. Kopecek, Joseph Thomas. Limited flow thrust reverser actuating. USP20190310227951.
  13. John R. Mickowski. Method and apparatus for the control of a die casting or similar machine. USP2002036357334.
  14. Manring Noah D. ; Yu Lifei. Method and system for electrohydraulic valve control. USP2001096286412.
  15. Wiklund, David E.; Krouth, Terrance F.; Habegger, Richard J.; Hineman, Richard R.. Piston position measuring device. USP2004116817252.
  16. Lund Richard A. (Chaska MN). Servovalve flow linearization circuit. USP1982064336745.
  17. Schumacher, Mark S.; Krouth, Terrance F.; Wiklund, David E.; Habegger, Richard J.; Hineman, Richard R.. System for controlling hydraulic actuator. USP2004096789458.
  18. Kolbenschlag, Stefan. Transducer of an electrical input signal into pneumatic output signals. USP2010097802585.