EP2743517A1 - Système de commande hydraulique pour engins de chantier - Google Patents

Système de commande hydraulique pour engins de chantier Download PDF

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Publication number
EP2743517A1
EP2743517A1 EP20110870643 EP11870643A EP2743517A1 EP 2743517 A1 EP2743517 A1 EP 2743517A1 EP 20110870643 EP20110870643 EP 20110870643 EP 11870643 A EP11870643 A EP 11870643A EP 2743517 A1 EP2743517 A1 EP 2743517A1
Authority
EP
European Patent Office
Prior art keywords
arm
bucket
joystick
hydraulic
cylinder
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.)
Withdrawn
Application number
EP20110870643
Other languages
German (de)
English (en)
Other versions
EP2743517A4 (fr
Inventor
Ok-Jin Suk
Chun-Han Lee
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.)
Volvo Construction Equipment AB
Original Assignee
Volvo Construction Equipment AB
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 Volvo Construction Equipment AB filed Critical Volvo Construction Equipment AB
Publication of EP2743517A1 publication Critical patent/EP2743517A1/fr
Publication of EP2743517A4 publication Critical patent/EP2743517A4/fr
Withdrawn legal-status Critical Current

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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
    • E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
    • E02F9/2242—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance including an electronic controller
    • 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
    • E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
    • E02F9/2235—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps including an electronic controller
    • 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
    • E02F9/2004—Control mechanisms, e.g. control levers
    • 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
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2282—Systems using center bypass type changeover valves
    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2285—Pilot-operated systems
    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more pumps
    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2296—Systems with a variable displacement pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/85978—With pump
    • Y10T137/85986—Pumped fluid control

Definitions

  • the present invention relates to a hydraulic control system for a construction machine. More particularly, the present invention relates to a hydraulic control system for a construction machine, which can operate an arm cylinder and a bucket cylinder by supplying hydraulic fluid from respective hydraulic pumps to the arm cylinder and the bucket cylinder during a combined operation such as an excavating work in which an arm joystick and a bucket joystick are simultaneously operated.
  • a hydraulic control system for a construction machine in the related art includes a pair of first and second variable displacement hydraulic pumps (hereinafter referred to as "hydraulic pumps") 1 and 2; an arm cylinder 3 connected to the first hydraulic pump 1; a bucket cylinder (not illustrated) connected to the second hydraulic pump 2; an arm joystick 4 and a bucket joystick (not illustrated) outputting control signals according to operation amounts; a first arm control valve 5 installed in a flow path between the first hydraulic pump 1 and the arm cylinder 3 and shifted to control a start, stop, and direction change of the arm cylinder 3 in response to an operation of the arm joystick 4; a second arm control valve 6 installed in a flow path between the second hydraulic pump 2 and the arm cylinder 3 and shifted to make discharged hydraulic fluid of the second hydraulic pump 2 join the hydraulic fluid of the arm cylinder 3 to be supplied if the control signal according to the operation of the arm joystick 4 exceeds a set value; and a bucket control valve (not illustrated) installed in a path between
  • the first arm control valve 5 is shifted in the rightward direction in the drawing in accordance with a control signal that is generated through the operation of the arm joystick 4 to perform arm-in driving, and thus hydraulic fluid that is discharged from the first hydraulic pump 1 is supplied to a large chamber 3a of the arm cylinder 3 via the shifted first arm control valve 5.
  • the hydraulic fluid that returns from a small chamber 3b of the arm cylinder 3 is fed back to a hydraulic tank T via the first arm control valve 5.
  • the second arm control valve 6 is shifted in the leftward direction in the drawing, and thus the hydraulic fluid from the second hydraulic pump 2 joins hydraulic fluid of a large chamber 2a of the arm cylinder 2 via the shifted second arm control valve 6 to be supplied.
  • the bucket cylinder may be driven by the hydraulic fluid that is supplied from the second hydraulic pump 2 due to the operation of the bucket joystick.
  • the arm cylinder 3 may be driven by the hydraulic fluids discharged from the first and second hydraulic pumps 1 and 2 to join each other.
  • the hydraulic fluids discharged from the first and second hydraulic pumps 1 and 2 join each other and are supplied to the arm cylinder 3 to drive the arm cylinder, and the hydraulic fluid discharged from the second hydraulic pump 2 is supplied only to the bucket cylinder to drive the bucket cylinder.
  • the discharge pressures of the first and second hydraulic pumps 1 and 2 are generally increased. Due to this, a pressure loss occurs, and this exerts a bad influence on the fuel efficiency.
  • one embodiment of the present invention is related to a hydraulic control system for a construction machine, which can prevent a pressure loss of hydraulic pumps by releasing a confluence function and making hydraulic fluids from the respective hydraulic pumps be supplied to an arm cylinder and a bucket cylinder, respectively, during an excavating work in which an arm and a bucket are simultaneously operated.
  • a hydraulic control system for a construction machine which includes first and second variable displacement hydraulic pumps; an arm cylinder connected to the first hydraulic pump; a bucket cylinder connected to the second hydraulic pump; an arm joystick and a bucket joystick configured to output control signals according to operation amounts thereof; a first arm control valve installed in a flow path between the first hydraulic pump and the arm cylinder and shifted to control a start, stop, and direction change of the arm cylinder in response to an operation of the arm joystick; a second arm control valve installed in a flow path between the second hydraulic pump and the arm cylinder and shifted to make discharged hydraulic fluid of the second hydraulic pump join hydraulic fluid of the arm cylinder to be supplied if the control signal according to the operation of the arm joystick exceeds a set value; a bucket control valve installed in a path between the second hydraulic pump and the bucket cylinder and shifted to control a start, stop, and direction change of the bucket cylinder in response to the operation of the bucket joystick; and a confluence
  • a hydraulic control system including first and second variable displacement hydraulic pumps, an arm cylinder connected to the first hydraulic pump, a bucket cylinder connected to the second hydraulic pump, an arm joystick and a bucket joystick outputting control signals according to operation amounts thereof, a first arm control valve controlling hydraulic fluid supplied to the arm cylinder according to an operation of the arm joystick, a second arm control valve controlling the hydraulic fluid that is supplied from the second hydraulic pump to the arm cylinder if a control signal according to the operation of the arm joystick exceeds a set value, a bucket control valve controlling driving of the bucket cylinder according to an operation of the bucket joystick, and a confluence cutoff proportional valve making the hydraulic fluid of the second hydraulic pump join the hydraulic fluid of the first hydraulic pump if the arm cylinder is singly operated and cutting off a confluence function if the arm cylinder and the bucket cylinder are simultaneously operated, the hydraulic control system includes a first step of reading an arm-in control signal according to an operation amount of the arm joystick,
  • the confluence cutoff proportional valve may operate in a first state of cutting off a flow path when the arm joystick and the bucket joystick are simultaneously operated, and in a second state of connecting the flow path when the arm joystick is singly operated.
  • the confluence cutoff proportional valve may operate in a first section where movement amounts are controlled to be gradually increased in proportion to the operation amounts of the arm joystick and the bucket joystick to release the confluence function, in a second section where the confluence cutoff state is maintained according to the increase of the operation amounts of the arm joystick and the bucket joystick, and in a third section where movement amounts are controlled to be gradually decreased in reverse proportion to the operation amounts of the arm joystick and the bucket joystick to be shifted to the confluence function.
  • the confluence cutoff proportional valve may include a solenoid valve that is shifted to open/close the flow path in response to an input of an electric signal.
  • the confluence cutoff proportional valve may include an electro proportional control valve that is shifted to open/close the flow path according to an input of an electric signal.
  • the hydraulic control system for a construction machine has the following advantages.
  • a hydraulic control system for a construction machine includes first and second variable displacement hydraulic pumps (hereinafter referred to as "hydraulic pumps") 1 and 2; an arm cylinder 3 connected to the first hydraulic pump 1; a bucket cylinder (not illustrated) connected to the second hydraulic pump 2; an arm joystick 4 and a bucket joystick (not illustrated) outputting control signals according to operation amounts; a first arm control valve 5 installed in a flow path between the first hydraulic pump 1 and the arm cylinder 3 and shifted to control a start, stop, and direction change of the arm cylinder 3 in response to an operation of the arm joystick 4; a second arm control valve 6 installed in a flow path between the second hydraulic pump 2 and the arm cylinder 3 and shifted to make discharged hydraulic fluid of the second hydraulic pump 2 join the hydraulic fluid of the arm cylinder 3 to be supplied if the control signal according to the operation of the arm joystick 4 exceeds a set value; a bucket control valve (not illustrated) installed in a path between the
  • a hydraulic control system including first and second variable displacement hydraulic pumps 1 and 2, an arm cylinder 3 connected to the first hydraulic pump 1, a bucket cylinder (not illustrated) connected to the second hydraulic pump 2, an arm joystick 4 and a bucket joystick (not illustrated) outputting control signals according to operation amounts thereof, a first arm control valve 5 controlling hydraulic fluid supplied to the arm cylinder 3 according to an operation of the arm joystick 4, a second arm control valve 6 controlling the hydraulic fluid that is supplied from the second hydraulic pump 2 to the arm cylinder 3 if a control signal according to the operation of the arm joystick 4 exceeds a set value, a bucket control valve (not illustrated) controlling driving of the bucket cylinder according to an operation of the bucket joystick, and a confluence cutoff proportional valve 8 making the hydraulic fluid of the second hydraulic pump 2 join the hydraulic fluid of the first hydraulic pump 1 if the arm cylinder 3 is singly operated and cutting off a confluence function if the arm cylinder 3 and the bucket cylinder are simultaneously operated, the hydraulic control system
  • the confluence cutoff proportional valve 8 operates in a first state I of cutting off a flow path 7 when the arm joystick 4 and the bucket joystick are simultaneously operated, and in a second state II of connecting the flow path 7 when the arm joystick is singly operated.
  • the confluence cutoff proportional valve 8 operates in a first section (a) where movement amounts are controlled to be gradually increased in proportion to the operation amounts of the arm joystick 4 and the bucket joystick to release the confluence function (the second state II of the confluence cutoff proportional valve 8), in a second section (b) where the confluence cutoff state (the first state I of the confluence cutoff proportional valve 8) is maintained according to the increase of the operation amounts of the arm joystick 4 and the bucket joystick, and in a third section (c) where movement amounts are controlled to be gradually decreased in reverse proportion to the operation amounts of the arm joystick 4 and the bucket joystick to be shifted to the confluence function (the second state II of the confluence cutoff proportional valve 8).
  • the confluence cutoff proportional valve 8 may include a solenoid valve that is shifted to open/close the flow path 7 in response to an input of an electric signal.
  • the confluence cutoff proportional valve 8 may include an electro proportional control valve that is shifted to open/close the flow path 7 according to an input of an electric signal.
  • the first arm control valve 5 is shifted in the rightward direction in the drawing in accordance with the control signal that is generated through the arm-in operation of the arm joystick 4, and thus hydraulic fluid Q1 that is discharged from the first hydraulic pump 1 in accordance with the operation amount of the arm joystick 4 is supplied to a large chamber 3a of the arm cylinder 3 via the shifted first arm control valve 5.
  • the hydraulic fluid that returns from a small chamber 3b of the arm cylinder 3 is fed back to a hydraulic tank T via the first arm control valve 5.
  • the second arm control valve 6 is shifted in the leftward direction in the drawing, and thus hydraulic fluid Q2 that is discharged from the second hydraulic pump 2 joins hydraulic fluid of a large chamber 2a of the arm cylinder 2 via the confluence cutoff proportional valve 8 and the second arm control valve 6 in order (in this case, the amount of hydraulic fluid that is supplied to the large chamber 3a of the arm cylinder 3 becomes (Q1+Q2)).
  • the operation speed of the arm cylinder 3 can be increased.
  • the bucket cylinder may be driven by the hydraulic fluid that is supplied from the second hydraulic pump 2 due to the operation of the bucket joystick.
  • a controller (not illustrated) outputs an electric control signal (a control signal for cutting off the confluence of the hydraulic fluids of the first and second hydraulic pumps 1 and 2) to the confluence cutoff proportional valve 8.
  • the confluence cutoff proportional valve 8 is shifted in the downward direction in the drawing to cut off the flow path (supply side flow path provided between the second hydraulic pump 2 and the second arm control valve 6, and thus the hydraulic fluid from the second hydraulic pump 2 becomes unable to join the hydraulic fluid of the first hydraulic pump 1. That is, the hydraulic fluid from the first hydraulic pump 1 is supplied to the arm cylinder 3 via the first arm control valve 5, and at the same time, the hydraulic fluid from the second hydraulic pump 2 is supplied to the bucket cylinder via a bucket control valve (not illustrated) (at this time, the hydraulic fluid that is supplied to the bucket cylinder is supplied without being interfered with the operation of the arm cylinder 3).
  • an electric control signal that is in proportion to the arm-in control signal and the bucket-in control signal is applied from the controller to the confluence cutoff proportional valve 8 to shift the confluence cutoff proportional valve 8 to a first state I, and thus the flow path 7 between the second hydraulic pump 2 and the second arm control valve 6 is cut off.
  • control signal S that is applied to the confluence cutoff proportional valve 8 may be expressed by the following equation.
  • S arm - in operation amount ⁇ C ⁇ and bucket - in operation amount ⁇ D
  • C and D are predetermined constants that are applied to works selected according to various excavating conditions.
  • the confluence cutoff proportional valve 8 operates in a first section (a) where movement amounts are controlled to be gradually increased in proportion to the operation amounts of the arm joystick 4 and the bucket joystick to release the confluence function, in a second section (b) where the confluence cutoff state is maintained according to the increase of the operation amounts of the arm joystick 4 and the bucket joystick, and in a third section (c) where movement amounts are controlled to be gradually decreased in reverse proportion to the operation amounts of the arm joystick 4 and the bucket joystick to be shifted to the confluence function.
  • the confluence function is released by cutting off the flow path 7 through the confluence cutoff proportional valve 8, and thus the hydraulic fluid of the second hydraulic pump 2 becomes unable to join the hydraulic fluid discharged from the first hydraulic pump 1 any further.
  • the hydraulic fluid from the first hydraulic pump 1 is supplied to the large chamber 3a of the arm cylinder 3 via the first arm control valve 5, and at the same time, the hydraulic fluid from the second hydraulic pump 2 is supplied to the large chamber of the bucket cylinder via the bucket control valve.
  • the hydraulic fluids which correspond to powers that are respectively required in the arm cylinder and the bucket cylinder, are supplied from the respective hydraulic pumps to the arm cylinder and the bucket cylinder, and thus pressure loss of the hydraulic pumps can be prevented to heighten the fuel efficiency.
  • the hydraulic control system for a construction machine can be used in an excavator or a loader, and in the case where the excavating work is done by simultaneously operating the arm and the bucket, the hydraulic fluids are made to be supplied from the respective hydraulic pumps to the arm cylinder and the bucket cylinder, and thus the pressure loss of the hydraulic pumps can be prevented to heighten the fuel efficiency.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)
EP20110870643 2011-08-09 2011-08-09 Système de commande hydraulique pour engins de chantier Withdrawn EP2743517A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2011/005790 WO2013022131A1 (fr) 2011-08-09 2011-08-09 Système de commande hydraulique pour engins de chantier

Publications (2)

Publication Number Publication Date
EP2743517A1 true EP2743517A1 (fr) 2014-06-18
EP2743517A4 EP2743517A4 (fr) 2015-04-08

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ID=47668625

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20110870643 Withdrawn EP2743517A4 (fr) 2011-08-09 2011-08-09 Système de commande hydraulique pour engins de chantier

Country Status (6)

Country Link
US (1) US20140158235A1 (fr)
EP (1) EP2743517A4 (fr)
JP (1) JP5771332B2 (fr)
KR (1) KR20140050030A (fr)
CN (1) CN103717914B (fr)
WO (1) WO2013022131A1 (fr)

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KR100961433B1 (ko) * 2008-10-13 2010-06-09 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 건설장비용 유압시스템
EP2157245B1 (fr) * 2008-08-21 2021-03-17 Volvo Construction Equipment AB Système hydraulique pour équipement de construction.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11408145B2 (en) 2016-09-21 2022-08-09 Komatsu Ltd. Work vehicle and hydraulic control method

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CN103717914A (zh) 2014-04-09
EP2743517A4 (fr) 2015-04-08
WO2013022131A1 (fr) 2013-02-14
JP5771332B2 (ja) 2015-08-26
KR20140050030A (ko) 2014-04-28
US20140158235A1 (en) 2014-06-12
JP2014522952A (ja) 2014-09-08
CN103717914B (zh) 2016-05-11

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