JPS646501A - Control apparatus for load sensing hydraulic drive circuit - Google Patents

Control apparatus for load sensing hydraulic drive circuit

Info

Publication number
JPS646501A
JPS646501A JP16270287A JP16270287A JPS646501A JP S646501 A JPS646501 A JP S646501A JP 16270287 A JP16270287 A JP 16270287A JP 16270287 A JP16270287 A JP 16270287A JP S646501 A JPS646501 A JP S646501A
Authority
JP
Japan
Prior art keywords
control apparatus
differential pressure
pressure
flow rate
hydraulic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP16270287A
Other languages
Japanese (ja)
Other versions
JPH076521B2 (en
Inventor
Eiki Izumi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP62162702A priority Critical patent/JPH076521B2/en
Publication of JPS646501A publication Critical patent/JPS646501A/en
Publication of JPH076521B2 publication Critical patent/JPH076521B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • E02F9/2228—Control of flow rate; Load sensing arrangements using pressure-compensating valves including an electronic controller

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE:To improve complex controllability of the title control apparatus by obtaining a signal of differential pressure between the discharge pressure of a hydraulic pump and the maximum load pressure and by reducing each flow rate command value at the same ratio as the ratio of the differential signal less than the predetermined value. CONSTITUTION:A differential pressure meter 43 is provided for detecting a differential pressure between the discharge pressure of a hydraulic pump 1 and the maximum load pressure of hydraulic actuators 2, 3. The output from the differential pressure meter 43 is inputted to a control apparatus 46 and, when the differential pressure is less than the predetermined value, each flow rate command value is reduced at the same ratio of reduction. Since the supplying flow to each of hydraulic actuators 2, 3 can be reduced at the same ratio, while the discharge flow rate of the hydraulic 1 being arranged in accordance with the proportion of operating quantities of operational means 19, 20, in this way, the complex controllability is improved.
JP62162702A 1987-06-30 1987-06-30 Load sensing hydraulic drive circuit controller Expired - Fee Related JPH076521B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62162702A JPH076521B2 (en) 1987-06-30 1987-06-30 Load sensing hydraulic drive circuit controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62162702A JPH076521B2 (en) 1987-06-30 1987-06-30 Load sensing hydraulic drive circuit controller

Publications (2)

Publication Number Publication Date
JPS646501A true JPS646501A (en) 1989-01-11
JPH076521B2 JPH076521B2 (en) 1995-01-30

Family

ID=15759677

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62162702A Expired - Fee Related JPH076521B2 (en) 1987-06-30 1987-06-30 Load sensing hydraulic drive circuit controller

Country Status (1)

Country Link
JP (1) JPH076521B2 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01312202A (en) * 1988-01-27 1989-12-18 Hitachi Constr Mach Co Ltd Load sensing hydraulic drive circuit control device
JPH02275101A (en) * 1989-04-17 1990-11-09 Hitachi Constr Mach Co Ltd Control device of load sensing hydraulic driven circuit
JPH06221301A (en) * 1993-01-19 1994-08-09 Samsung Heavy Ind Co Ltd Hydraulic pump discharge flow control device
WO2004007973A1 (en) * 2002-07-11 2004-01-22 Nabtesco Corporation Electrohydraulic actuation system
JP2008224038A (en) * 2008-04-07 2008-09-25 Komatsu Ltd Control device for hydraulic drive machine
WO2008116515A1 (en) * 2007-03-27 2008-10-02 Hydac Filtertechnik Gmbh Valve arrangement
JP2010539411A (en) * 2007-09-13 2010-12-16 キャタピラー インコーポレイテッド Actuator control system for adaptive flow control
WO2014061507A1 (en) * 2012-10-17 2014-04-24 日立建機株式会社 Hydraulic drive device for construction machinery
WO2014068973A1 (en) 2012-10-30 2014-05-08 川崎重工業株式会社 Hydraulic pressure control device
WO2019188061A1 (en) * 2018-03-27 2019-10-03 ヤンマー株式会社 Hydraulic circuit for work vehicle
JP2024025121A (en) * 2022-08-10 2024-02-26 株式会社クボタ Work equipment hydraulic system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6011706A (en) * 1983-06-14 1985-01-22 リンデ・アクチエンゲゼルシヤフト Liquid pressure type apparatus having at least two working apparatuses loaded by one pump
JPS6244105U (en) * 1985-09-06 1987-03-17
JPS6275107A (en) * 1985-09-30 1987-04-07 Komatsu Ltd Flow rate control method and device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6011706A (en) * 1983-06-14 1985-01-22 リンデ・アクチエンゲゼルシヤフト Liquid pressure type apparatus having at least two working apparatuses loaded by one pump
JPS6244105U (en) * 1985-09-06 1987-03-17
JPS6275107A (en) * 1985-09-30 1987-04-07 Komatsu Ltd Flow rate control method and device

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01312202A (en) * 1988-01-27 1989-12-18 Hitachi Constr Mach Co Ltd Load sensing hydraulic drive circuit control device
JPH02275101A (en) * 1989-04-17 1990-11-09 Hitachi Constr Mach Co Ltd Control device of load sensing hydraulic driven circuit
JPH06221301A (en) * 1993-01-19 1994-08-09 Samsung Heavy Ind Co Ltd Hydraulic pump discharge flow control device
WO2004007973A1 (en) * 2002-07-11 2004-01-22 Nabtesco Corporation Electrohydraulic actuation system
WO2008116515A1 (en) * 2007-03-27 2008-10-02 Hydac Filtertechnik Gmbh Valve arrangement
US8479636B2 (en) 2007-03-27 2013-07-09 Hydac Filtertechnik Gmbh Valve arrangement
JP2010539411A (en) * 2007-09-13 2010-12-16 キャタピラー インコーポレイテッド Actuator control system for adaptive flow control
JP2008224038A (en) * 2008-04-07 2008-09-25 Komatsu Ltd Control device for hydraulic drive machine
WO2014061507A1 (en) * 2012-10-17 2014-04-24 日立建機株式会社 Hydraulic drive device for construction machinery
JPWO2014061507A1 (en) * 2012-10-17 2016-09-05 日立建機株式会社 Hydraulic drive unit for construction machinery
US9828746B2 (en) 2012-10-17 2017-11-28 Hitachi Construction Machinery Tierra Co., Ltd. Hydraulic driving system for construction machine
WO2014068973A1 (en) 2012-10-30 2014-05-08 川崎重工業株式会社 Hydraulic pressure control device
CN104302931A (en) * 2012-10-30 2015-01-21 川崎重工业株式会社 Hydraulic pressure control device
WO2019188061A1 (en) * 2018-03-27 2019-10-03 ヤンマー株式会社 Hydraulic circuit for work vehicle
JP2019173803A (en) * 2018-03-27 2019-10-10 ヤンマー株式会社 Hydraulic circuit for work vehicle
KR20200135275A (en) * 2018-03-27 2020-12-02 얀마 파워 테크놀로지 가부시키가이샤 Hydraulic circuit of the working vehicle
JP2024025121A (en) * 2022-08-10 2024-02-26 株式会社クボタ Work equipment hydraulic system

Also Published As

Publication number Publication date
JPH076521B2 (en) 1995-01-30

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees