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WO2013022131A1 - Hydraulic control system for construction machinery - Google Patents

Hydraulic control system for construction machinery Download PDF

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Publication number
WO2013022131A1
WO2013022131A1 PCT/KR2011/005790 KR2011005790W WO2013022131A1 WO 2013022131 A1 WO2013022131 A1 WO 2013022131A1 KR 2011005790 W KR2011005790 W KR 2011005790W WO 2013022131 A1 WO2013022131 A1 WO 2013022131A1
Authority
WO
WIPO (PCT)
Prior art keywords
arm
bucket
operating device
hydraulic pump
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.)
Ceased
Application number
PCT/KR2011/005790
Other languages
French (fr)
Korean (ko)
Inventor
석옥진
이춘한
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
Priority to US14/235,182 priority Critical patent/US20140158235A1/en
Priority to EP20110870643 priority patent/EP2743517A4/en
Priority to JP2014524910A priority patent/JP5771332B2/en
Priority to CN201180072647.XA priority patent/CN103717914B/en
Priority to PCT/KR2011/005790 priority patent/WO2013022131A1/en
Priority to KR20147002787A priority patent/KR20140050030A/en
Publication of WO2013022131A1 publication Critical patent/WO2013022131A1/en
Anticipated expiration legal-status Critical
Ceased 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 of a construction machine, and more particularly, the hydraulic fluid from each hydraulic pump to the arm cylinder and the bucket cylinder during the combined operation to perform the excavation work by operating the arm operating device and the bucket operating device at the same time It relates to a hydraulic control system of a construction machine to supply and operate.
  • hydraulic pump A pair of variable displacement first and second hydraulic pumps 1 and 2 (hereinafter referred to as "hydraulic pump")
  • An arm joystick 4 and a bucket joystick (not shown) which respectively output control signals according to the amount of manipulation;
  • the first arm is installed in the flow path between the first hydraulic pump 1 and the arm cylinder 3, and controls the start, stop and direction change of the arm cylinder 3 at the time of switching according to the operation of the arm operating device 4.
  • Control valve (5)
  • a bucket control valve (not shown) is installed in the flow path between the second hydraulic pump 2 and the bucket cylinder (not shown), and controls the start, stop, and direction change of the bucket cylinder during switching according to the operation of the bucket operating device. ).
  • the first arm control valve (5) by the control signal according to the operation of the arm operating device (4) to drive the arm-in (arm-in)
  • the hydraulic oil discharged from the first hydraulic pump 1 is supplied to the large chamber 3a of the arm cylinder 3 via the switched first arm control valve 5.
  • the hydraulic oil returned from the small chamber 3b of the arm cylinder 3 is returned to the hydraulic tank T via the first arm control valve 5.
  • the bucket cylinder can be driven by the operating oil supplied from the second hydraulic pump 2 due to the operation of the bucket operating device.
  • the arm cylinder 3 can be driven by the working oil discharged from the first and second hydraulic pumps 1 and 2 and joined in the combined operation of simultaneously operating the arm and the bucket.
  • Embodiment of the present invention when operating the arm and the bucket at the same time during the excavation operation, the confluence function is released so that the arm cylinder and the bucket cylinder is driven by receiving hydraulic oil from their respective hydraulic pump to prevent the pressure loss of the hydraulic pump Related to the hydraulic control system of a construction machine.
  • Hydraulic control system of a construction machine according to an embodiment of the present invention
  • a bucket cylinder connected to the second hydraulic pump
  • An arm operating device and a bucket operating device for outputting a control signal according to the operation amount
  • a first arm control valve installed in a flow path between the first hydraulic pump and the arm cylinder, the first arm control valve controlling the start, stop and direction change of the arm cylinder at the time of switching according to the operation of the arm operating device;
  • the second arm is installed in the flow path between the second hydraulic pump and the arm cylinder, and is switched when the control signal according to the operation of the arm operating device exceeds the set value so that the discharge flow rate of the second hydraulic pump is joined to the arm cylinder and supplied.
  • Control valve
  • a bucket control valve installed in a flow path between the second hydraulic pump and the bucket cylinder and controlling the start, stop and direction change of the bucket cylinder during switching according to the operation of the bucket operating device;
  • Hydraulic control system of a construction machine according to an embodiment of the present invention
  • a variable displacement first and second hydraulic pumps an arm cylinder connected to the first hydraulic pump, a bucket cylinder connected to the second hydraulic pump, an arm operating device and a bucket operating device for outputting a control signal according to the operation amount;
  • a first arm control valve for controlling the hydraulic oil supplied to the arm cylinder according to the operation of the arm operating device, and the hydraulic oil supplied to the arm cylinder from the second hydraulic pump when the control signal according to the operation of the arm operating device exceeds the set value.
  • a second arm control valve for controlling the oil pressure, a bucket control valve for controlling the driving of the bucket cylinder according to the operation of the bucket operating device, and a flow rate of the second hydraulic pump when the arm cylinder is driven alone.
  • the hydraulic system including a confluence cancellation valve for closing the confluence function when the arm cylinder and the bucket cylinder are driven at the same time,
  • a first section in which the moving amount is gradually increased in proportion to the amount of operation of the arm operating device and the bucket operating device to release the joining function, and the control to maintain the joining interruption state as the operating amount of the arm operating device and the bucket operating device increases.
  • a third section in which the movement amount is gradually reduced in inverse proportion to the operation amount of the arm operating device and the bucket operating device to switch to the confluence function.
  • a solenoid valve that is switched in accordance with the input of the electrical signal to open and close the flow path may be used.
  • An electronic proportional control valve which is switched in accordance with the input of an electrical signal proportional to an operation signal of the arm operating device and the bucket operating device to open and close the flow path can be used.
  • Hydraulic control system of a construction machine according to an embodiment of the present invention configured as described above has the following advantages.
  • FIG. 1 is a hydraulic circuit diagram of a hydraulic control system of a construction machine according to the prior art
  • FIG. 2 is a hydraulic circuit diagram of a hydraulic control system of a construction machine according to an embodiment of the present invention
  • FIG. 3 is a flow chart showing a control method of a hydraulic control system of a construction machine according to an embodiment of the present invention
  • Figure 4 is a graph for explaining the operation of the combined cancellation valve in the hydraulic control system of a construction machine according to an embodiment of the present invention.
  • variable displacement first and second hydraulic pumps 1 and 2 (hereinafter referred to as “hydraulic pumps")
  • the first arm is installed in the flow path between the first hydraulic pump 1 and the arm cylinder 3, and controls the start, stop and direction change of the arm cylinder 3 at the time of switching according to the operation of the arm operating device 4.
  • Control valve (5)
  • a bucket control valve (not shown) installed in a flow path between the second hydraulic pump 2 and the bucket cylinder and controlling the start, stop and direction change of the bucket cylinder during switching according to the operation of the bucket operating device;
  • Hydraulic control system of a construction machine according to an embodiment of the present invention
  • Variable displacement first and second hydraulic pumps (1 and 2), arm cylinders (3) connected to the first hydraulic pump (1), bucket cylinders (not shown) connected to the second hydraulic pump, and operation amount
  • the arm operating device 4 and the bucket operating device (not shown) for outputting a control signal according to the present invention, and the first arm control for controlling the hydraulic oil supplied to the arm cylinder 3 in accordance with the operation of the arm operating device 4.
  • the second arm control valve 6 for controlling the hydraulic oil supplied from the second hydraulic pump 2 to the arm cylinder 3 when the control signal according to the operation of the valve 5 and the arm operating device exceeds the set value.
  • a flow rate of the second hydraulic pump 2 when the arm cylinder 3 is driven alone and a bucket control valve (not shown) for controlling the operation of the bucket cylinder according to the operation of the bucket operating device.
  • the arm-in control signal and the bucket-in control signal exceed the set value Ap and the discharge pressure of the first and second hydraulic pumps 1 and 2 respectively exceed the set value Bp, the arm-in And a fourth step S400 of applying a control signal proportional to the control signal and the bucket-in control signal to the merge cancellation valve 8 to release the merge function.
  • a state (II) is provided.
  • the first section (controlled so that the movement amount is gradually increased in proportion to the operation amount of the arm operating device 4 and the bucket operating device, respectively) to release the joining function (referring to the second state (II) of the joining cancellation valve 8) ( a) and a second section (b) controlled to maintain the joining blocking state (referring to the first state (I) of the joining cancellation valve 8) in accordance with an increase in the operation amount of the arm operating device 4 and the bucket operating device.
  • a third section in which the moving amount is controlled to gradually decrease in inverse proportion to the operation amount of the arm operating device 4 and the bucket operating device for switching to the joining function (referring to the second state (II) of the joining cancellation valve 8). (c).
  • a solenoid valve which is switched in accordance with the input of the electrical signal to open and close the flow path 7 may be used.
  • An electronic proportional control valve that is switched in accordance with the input of an electrical signal proportional to the operation signal of the arm operating device 4 and the bucket operating device, to open and close the flow path 7 can be used.
  • the first arm control valve 5 is switched to the right in the drawing by the control signal according to the arm-in operation of the arm operating device 4 described above. Therefore, the hydraulic oil Q1 discharged from the first hydraulic pump 1 according to the operation amount of the arm operating device 4 passes through the large chamber 3a of the arm cylinder 3 via the switched first arm control valve 5. Is supplied. At this time, the hydraulic oil returned from the small chamber 3b of the arm cylinder 3 is returned to the hydraulic tank T via the first arm control valve 5.
  • the second arm control valve 6 is switched to the left in the drawing, so that the hydraulic oil Q2 discharged from the second hydraulic pump 2 Is supplied to the arm cylinder 2 in the large chamber 2a via the merging canceling valve 8 and the second arm control valve 6 in turn (that is, to the large chamber 3a of the arm cylinder 3).
  • the flow rate supplied is (Q1 + Q2).
  • the hydraulic oil Q2 supplied from the second hydraulic pump 2 joins and supplies the hydraulic oil Q1 supplied from the first hydraulic pump 1 to the arm cylinder 3. Therefore, the operating speed of the arm cylinder 3 can be increased (Q1 + Q2).
  • the bucket cylinder may be driven by the hydraulic oil supplied from the second hydraulic pump 2 due to the operation of the bucket operating device.
  • the electrical control signal (referring to the control signal for blocking the joining of the first and second hydraulic pumps 1 and 2) from the controller (not shown) to the joining cancellation valve 8 is provided. Is output.
  • the confluence cancellation valve 8 is switched downward in the drawing to block the flow path (referring to the supply side flow path between the second hydraulic pump 2 and the second arm control valve 6).
  • the hydraulic oil from the second hydraulic pump 2 is prevented from further joining the hydraulic oil of the first hydraulic pump 1. That is, the hydraulic oil 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 oil from the second hydraulic pump 2 is a bucket control valve (not shown). Can be supplied to the bucket cylinder (in this case, the hydraulic oil supplied to the bucket cylinder is supplied without being interfered with the operation of the arm cylinder 3).
  • the arm-in control signal according to the operation amount of the arm operating device 4 the bucket-in control signal according to the operation amount of the bucket operating device, and the discharge of the first and second hydraulic pumps 1 and 2. Read each pressure.
  • the arm-in control signal and the bucket-in control signal described above exceed the set value Ap and the discharge pressures of the first and second hydraulic pumps 1 and 2 respectively set the set value Bp.
  • the arm-in control signal and the bucket-in control signal described above exceed the set value Ap and the discharge pressures of the first and second hydraulic pumps 1 and 2 respectively set the set value Bp.
  • the second hydraulic pump is switched from the controller to the merging canceling valve 8 in proportion to the arm-in control signal and the bucket-in control signal described above to switch to the first state (I).
  • the flow path 7 between the 2 and the second arm control valve 6 is blocked.
  • control signal (S) applied to the merge cancellation valve (8) is expressed by the following formula.
  • S (arm-in manipulated amount ⁇ C) and (bucket-in manipulated amount ⁇ D).
  • C and D are constants predetermined to be applied to the selected work according to various working conditions of the excavation work.
  • the above-described joining canceling valve 8 includes a first section a in which the moving amount is controlled to gradually increase in proportion to the operating amounts of the arm operating device 4 and the bucket operating device, respectively, in order to release the joining function. ), A second section (b) which is controlled to maintain the joining blocking state as the operation amount of the arm operating device 4 and the bucket operating device increases, and the arm operating device 4 and the bucket operating device to switch to the joining function.
  • the third section (c) is controlled so that the moving amount is gradually reduced in inverse proportion to the operation amount of.
  • the hydraulic oil from the first hydraulic pump 1 is transferred to the large chamber 3a of the arm cylinder 3 via the first arm control valve 5.
  • the hydraulic oil from the second hydraulic pump 2 can be supplied to the large chamber of the bucket cylinder via the bucket control valve.
  • the hydraulic control system of the construction machine can be used for an excavator or a loader, and when operating the arm and the bucket at the same time for excavation work, the hydraulic oil from the respective hydraulic pump to the arm cylinder and the bucket cylinder It is possible to increase the fuel efficiency by preventing the pressure loss of the hydraulic pump by supplying.

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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)

Abstract

The present invention relates to a hydraulic control system for construction machinery capable of supplying a working fluid from a hydraulic pump to both an arm cylinder and a bucket cylinder and operating same, while performing a complex operation such as excavation by simultaneously operating an arm operating device and a bucket operating device. The hydraulic control system comprises: a first arm control valve installed in a passage between a first hydraulic pump and the arm cylinder, for controlling the driving, stopping, and directional switching of the arm cylinder when the first arm control valve is switched according to a manipulation of the arm operating device; a second arm control valve installed in a passage between a second hydraulic pump and the arm cylinder, for being switched to join and supply a flow discharged from the second hydraulic pump to the arm cylinder when a control signal according to the manipulation of the arm operating device exceeds a set value; a bucket control valve installed in a passage between the second hydraulic pump and the bucket cylinder, for controlling the driving, stopping, and directional switching of the bucket cylinder when the bucket control valve is switched according to a manipulation of the bucket operating device; and a joining cancellation valve installed in a passage between the second hydraulic pump and the second arm control valve.

Description

건설기계의 유압 제어시스템Hydraulic control system of construction machinery

본 발명은 건설기계의 유압 제어시스템에 관한 것으로, 더욱 상세하게는 아암 조작장치와 버킷 조작장치를 동시에 조작하여 굴삭 작업 등을 수행하는 복합 작동시, 아암실린더 및 버킷실린더에 각각의 유압펌프로부터 작동유를 공급하여 작동시킬 수 있도록 한 건설기계의 유압 제어시스템에 관한 것이다.The present invention relates to a hydraulic control system of a construction machine, and more particularly, the hydraulic fluid from each hydraulic pump to the arm cylinder and the bucket cylinder during the combined operation to perform the excavation work by operating the arm operating device and the bucket operating device at the same time It relates to a hydraulic control system of a construction machine to supply and operate.

도 1에 도시된 종래 기술에 의한 건설기계의 유압 제어시스템은,Hydraulic control system of a construction machine according to the prior art shown in Figure 1,

한 쌍의 가변용량형 제1,2유압펌프(1,2)(이하, "유압펌프" 라고 함)와,A pair of variable displacement first and second hydraulic pumps 1 and 2 (hereinafter referred to as "hydraulic pump"),

제1유압펌프(1)에 연결되는 아암실린더(3)와,An arm cylinder 3 connected to the first hydraulic pump 1,

제2유압펌프(2)에 연결되는 버킷실린더(미도시됨)와,Bucket cylinder (not shown) connected to the second hydraulic pump (2),

조작량에 따른 제어신호를 각각 출력하는 아암 조작장치(arm joystick)(4) 및 버킷 조작장치(미도시됨)(bucket joystick)와,An arm joystick 4 and a bucket joystick (not shown) which respectively output control signals according to the amount of manipulation;

제1유압펌프(1)와 아암실린더(3)사이의 유로에 설치되며, 아암 조작장치(4)의 조작에 따라 절환시 아암실린더(3)의 기동, 정지 및 방향전환을 제어하는 제1아암제어밸브(5)와,The first arm is installed in the flow path between the first hydraulic pump 1 and the arm cylinder 3, and controls the start, stop and direction change of the arm cylinder 3 at the time of switching according to the operation of the arm operating device 4. Control valve (5),

제2유압펌프(2)와 아암실린더(3)사이의 유로에 설치되며, 아암 조작장치(4)의 조작에 따른 제어신호가 설정값을 초과할 경우 절환되어 제2유압펌프(2)의 토출 유량을 아암실린더(3)에 합류시켜 공급하는 제2아암제어밸브(6)와,It is installed in the flow path between the second hydraulic pump (2) and the arm cylinder (3), it is switched when the control signal according to the operation of the arm operating device 4 exceeds the set value to discharge the second hydraulic pump (2) A second arm control valve 6 for joining and supplying a flow rate to the arm cylinder 3;

제2유압펌프(2)와 버킷실린더(미도시됨)사이에 유로에 설치되며, 버킷 조작장치의 조작에 따라 절환시 버킷실린더의 기동, 정지 및 방향전환을 제어하는 버킷제어밸브(미도시됨)를 포함한다.A bucket control valve (not shown) is installed in the flow path between the second hydraulic pump 2 and the bucket cylinder (not shown), and controls the start, stop, and direction change of the bucket cylinder during switching according to the operation of the bucket operating device. ).

따라서, 아암과 버킷을 동시에 조작하여 굴삭 작업 등을 수행할 경우, 아암-인(arm-in) 구동시키기 위하여 아암 조작장치(4)의 조작에 따른 제어신호에 의해 제1아암제어밸브(5)를 도면상, 우측방향으로 절환시키므로, 제1유압펌프(1)로부터 토출되는 작동유는 절환된 제1아암제어밸브(5)를 경유하여 아암실린더(3)의 라지챔버(3a)에 공급된다. 이때 아암실린더(3)의 스몰챔버(3b)로부터 리턴되는 작동유는 제1아암제어밸브(5)를 경유하여 유압탱크(T)로 귀환된다.Therefore, when performing the excavation work by operating the arm and the bucket at the same time, the first arm control valve (5) by the control signal according to the operation of the arm operating device (4) to drive the arm-in (arm-in) In the drawing, since it is switched to the right direction, the hydraulic oil discharged from the first hydraulic pump 1 is supplied to the large chamber 3a of the arm cylinder 3 via the switched first arm control valve 5. At this time, the hydraulic oil returned from the small chamber 3b of the arm cylinder 3 is returned to the hydraulic tank T via the first arm control valve 5.

전술한 아암 조작장치(4)의 조작량이 일정값을 초과할 경우에 제2아암제어밸브(6)가 도면상, 좌측방향으로 절환되므로, 제2유압펌프(2)로부터의 작동유는 절환된 제2아암제어밸브(6)를 경유하여 아암실린더(2)에 라지챔버(2a)에 합류되어 공급된다.When the operation amount of the arm operating device 4 described above exceeds a predetermined value, since the second arm control valve 6 is switched to the left in the drawing, the hydraulic oil from the second hydraulic pump 2 It is joined to the large chamber 2a and supplied to the arm cylinder 2 via the 2 arm control valve 6.

한편, 도면에는 미 도시되었으나, 버킷 조작장치의 조작으로 인해 제2유압펌프(2)로부터 공급되는 작동유에 의해 버킷실린더를 구동시킬 수 있다.On the other hand, although not shown in the figure, the bucket cylinder can be driven by the operating oil supplied from the second hydraulic pump 2 due to the operation of the bucket operating device.

따라서, 아암과 버킷을 동시에 조작하는 복합 작동시 제1,2유압펌프(1,2)로부터 토출되어 합류되는 작동유에 의해 아암실린더(3)를 구동시킬 수 있다.Therefore, the arm cylinder 3 can be driven by the working oil discharged from the first and second hydraulic pumps 1 and 2 and joined in the combined operation of simultaneously operating the arm and the bucket.

전술한 바와 같이, 아암과 버킷을 동시에 조작하여 굴삭 작업 등을 수행할 경우(일반적으로, 아암실린더(3)측에 발생되는 부하가 버킷실린더측에 발생되는 부하보다 크게 발생됨), 제1,2유압펌프(1,2)로부터 토출되는 작동유를 합류시켜 아암실린더(3)에 공급하여 구동시키고, 제2유압펌프(2)로부터 토출되는 작동유를 버킷실린더에만 공급하여 구동시킨다. 이때 아암실린더(3)나 버킷실린더측에 작용하는 외부 부하에 따라 이들중 어느 일측에만 부하가 발생되는 경우에도 제1,2유압펌프(1,2)의 토출 압력이 전반적으로 상승된다. 이로 인해 압력 손실이 발생되므로 연비에 비효율적인 영향을 주게되는 문제점을 갖는다.As described above, when carrying out excavation work by operating the arm and the bucket simultaneously (generally, the load generated on the arm cylinder 3 side is greater than the load generated on the bucket cylinder side), 1, 2 The hydraulic oil discharged from the hydraulic pumps 1 and 2 are combined to be supplied to and driven by the arm cylinder 3, and the hydraulic oil discharged from the second hydraulic pump 2 is supplied and driven only to the bucket cylinder. At this time, the discharge pressure of the first and second hydraulic pumps 1 and 2 is generally increased even when a load is generated only on any one of these according to the external load acting on the arm cylinder 3 or the bucket cylinder side. As a result, pressure loss occurs, which has a problem of inefficiently affecting fuel efficiency.

본 발명의 실시예는, 아암과 버킷을 동시에 조작하여 굴삭 작업시, 합류기능을 해제시켜 아암실린더 및 버킷실린더는 이들 각각의 유압펌프로부터 작동유를 공급받아 구동되도록 하여 유압펌프의 압력 손실을 방지할 수 있도록 한 건설기계의 유압 제어시스템과 관련된다.Embodiment of the present invention, when operating the arm and the bucket at the same time during the excavation operation, the confluence function is released so that the arm cylinder and the bucket cylinder is driven by receiving hydraulic oil from their respective hydraulic pump to prevent the pressure loss of the hydraulic pump Related to the hydraulic control system of a construction machine.

본 발명의 일 실시예에 의한 건설기계의 유압 제어시스템은,Hydraulic control system of a construction machine according to an embodiment of the present invention,

가변용량형 제1,2유압펌프와,Variable displacement first and second hydraulic pumps,

제1유압펌프에 연결되는 아암실린더와,An arm cylinder connected to the first hydraulic pump,

제2유압펌프에 연결되는 버킷실린더와,A bucket cylinder connected to the second hydraulic pump,

조작량에 따른 제어신호를 출력하는 아암 조작장치 및 버킷 조작장치와,An arm operating device and a bucket operating device for outputting a control signal according to the operation amount;

제1유압펌프와 아암실린더사이의 유로에 설치되며, 아암 조작장치의 조작에 따라 절환시 아암실린더의 기동, 정지 및 방향전환을 제어하는 제1아암제어밸브와,A first arm control valve installed in a flow path between the first hydraulic pump and the arm cylinder, the first arm control valve controlling the start, stop and direction change of the arm cylinder at the time of switching according to the operation of the arm operating device;

제2유압펌프와 아암실린더사이의 유로에 설치되며, 아암 조작장치의 조작에 따른 제어신호가 설정값을 초과할 경우 절환되어 제2유압펌프의 토출 유량을 아암실린더에 합류시켜 공급하는 제2아암제어밸브와,The second arm is installed in the flow path between the second hydraulic pump and the arm cylinder, and is switched when the control signal according to the operation of the arm operating device exceeds the set value so that the discharge flow rate of the second hydraulic pump is joined to the arm cylinder and supplied. Control valve,

제2유압펌프와 버킷실린더사이에 유로에 설치되며, 버킷 조작장치의 조작에 따라 절환시 버킷실린더의 기동, 정지 및 방향전환을 제어하는 버킷제어밸브와,A bucket control valve installed in a flow path between the second hydraulic pump and the bucket cylinder and controlling the start, stop and direction change of the bucket cylinder during switching according to the operation of the bucket operating device;

제2유압펌프와 제2아암제어밸브사이의 유로에 설치되며, 아암 조작장치 및 버킷 조작장치를 동시에 조작하고 제1,2유압펌프의 토출 압력이 설정값을 초과할 경우 절환되고, 절환시 제2유압펌프로부터 토출되는 유량이 제1유압펌프의 토출 유량에 합류되는 것을 차단하는 합류 취소밸브를 포함한다.It is installed in the flow path between the second hydraulic pump and the second arm control valve, and operates the arm operating device and the bucket operating device at the same time, and is switched when the discharge pressure of the first and second hydraulic pumps exceeds the set value. And a joining cancellation valve for blocking the flow rate discharged from the two hydraulic pumps from joining the discharge flow rate of the first hydraulic pump.

본 발명의 일 실시예에 의한 건설기계의 유압 제어시스템은,Hydraulic control system of a construction machine according to an embodiment of the present invention,

가변용량형 제1,2유압펌프와, 제1유압펌프에 연결되는 아암실린더와, 제2유압펌프에 연결되는 버킷실린더와, 조작량에 따라 제어신호를 출력하는 아암 조작장치 및 버킷 조작장치와, 아암 조작장치의 조작에 따라 아암실린더에 공급되는 작동유를 제어하는 제1아암제어밸브와, 아암 조작장치의 조작에 따른 제어신호가 설정값을 초과할 경우 제2유압펌프로부터 아암실린더에 공급되는 작동유를 제어하는 제2아암제어밸브와, 버킷 조작장치의 조작에 따라 버킷실린더의 구동을 제어하는 버킷제어밸브와, 아암실린더의 단독 구동시 제2유압펌프의 유량을 제1유압펌프의 유량에 합류시키고 아암실린더 및 버킷실린더를 동시에 구동시킬 경우에 합류기능을 차단하는 합류 취소밸브를 포함하는 유압 시스템에 있어서,A variable displacement first and second hydraulic pumps, an arm cylinder connected to the first hydraulic pump, a bucket cylinder connected to the second hydraulic pump, an arm operating device and a bucket operating device for outputting a control signal according to the operation amount; A first arm control valve for controlling the hydraulic oil supplied to the arm cylinder according to the operation of the arm operating device, and the hydraulic oil supplied to the arm cylinder from the second hydraulic pump when the control signal according to the operation of the arm operating device exceeds the set value. A second arm control valve for controlling the oil pressure, a bucket control valve for controlling the driving of the bucket cylinder according to the operation of the bucket operating device, and a flow rate of the second hydraulic pump when the arm cylinder is driven alone. In the hydraulic system including a confluence cancellation valve for closing the confluence function when the arm cylinder and the bucket cylinder are driven at the same time,

아암 조작장치의 조작량에 따른 아암-인 제어신호, 버킷 조작장치의 조작량에 따른 버킷-인 제어신호 및 제1,2유압펌프의 토출 압력을 각각 읽어들이는 제1단계와,A first step of reading the arm-in control signal according to the operation amount of the arm operating device, the bucket-in control signal according to the operation amount of the bucket operating device and the discharge pressure of the first and second hydraulic pumps, respectively;

아암-인 제어신호가 설정값을 초과하고, 버킷-인 제어신호가 설정값을 초과하는 지를 각각 판단하는 제2단계와,A second step of judging whether the arm-in control signal exceeds the set value and the bucket-in control signal exceeds the set value, respectively;

제1유압펌프의 토출 압력이 설정값을 초과하고, 제2유압펌프의 토출 압력이 설정값을 초과하는 지를 각각 판단하는 제3단계와,A third step of judging whether the discharge pressure of the first hydraulic pump exceeds the set value and the discharge pressure of the second hydraulic pump exceeds the set value, respectively;

아암-인 제어신호와 버킷-인 제어신호가 각각 설정값을 초과하고 제1,2유압펌프의 토출 압력이 각각 설정값을 초과한 경우, 아암-인 제어신호 및 버킷-인 제어신호에 비례하는 제어신호를 합류 취소밸브에 인가시켜 합류기능을 해제시키는 제4단계를 포함한다.When the arm-in control signal and the bucket-in control signal exceed the set values and the discharge pressures of the first and second hydraulic pumps respectively exceed the set values, the arm-in control signal and the bucket-in control signal And a fourth step of applying the control signal to the merge cancellation valve to release the merge function.

바람직한 실시예에 의하면, 전술한 합류 취소밸브는,According to a preferred embodiment, the above-mentioned joining cancellation valve,

아암 조작장치와 버킷 조작장치를 동시에 조작할 경우 유로를 차단하는 제1상태와, 아암 조작장치를 단독으로 조작시 유로를 연결하는 제2상태를 구비하여 이뤄진다.A first state for blocking the flow path when operating the arm operating device and the bucket operating device at the same time, and a second state for connecting the flow path when operating the arm operating device alone.

전술한 합류 취소밸브는,The above-mentioned joining cancellation valve is

합류기능을 해제시키기 위해 아암 조작장치와 버킷 조작장치의 조작량에 각각 비례하여 이동량이 서서히 증가되도록 제어되는 제1구간과, 아암 조작장치와 버킷 조작장치의 조작량 증가에 따라 합류 차단상태를 유지하도록 제어되는 제2구간과, 합류기능으로 전환하기 위해 아암 조작장치와 버킷 조작장치의 조작량에 반비례하여 이동량이 서서히 감소되도록 제어되는 제3구간으로 이뤄진다.A first section in which the moving amount is gradually increased in proportion to the amount of operation of the arm operating device and the bucket operating device to release the joining function, and the control to maintain the joining interruption state as the operating amount of the arm operating device and the bucket operating device increases. And a third section in which the movement amount is gradually reduced in inverse proportion to the operation amount of the arm operating device and the bucket operating device to switch to the confluence function.

전술한 합류 취소밸브는,The above-mentioned joining cancellation valve is

전기적 신호의 입력에 따라 절환되어 유로를 개폐시키는 솔레노이드밸브가 사용될 수 있다.A solenoid valve that is switched in accordance with the input of the electrical signal to open and close the flow path may be used.

전술한 합류 취소밸브는,The above-mentioned joining cancellation valve is

아암 조작장치 및 버킷 조작장치의 조작신호에 비례하는 전기적 신호의 입력에 따라 절환되어 유로를 개폐시키는 전자비례제어밸브가 사용될 수 있다.An electronic proportional control valve which is switched in accordance with the input of an electrical signal proportional to an operation signal of the arm operating device and the bucket operating device to open and close the flow path can be used.

전술한 바와 같이 구성되는 본 발명의 실시예에 의한 건설기계의 유압 제어시스템은 아래와 같은 이점을 갖는다.Hydraulic control system of a construction machine according to an embodiment of the present invention configured as described above has the following advantages.

아암과 버킷을 동시에 조작하여 굴삭 작업할 경우에, 아암실린더 및 버킷실린더에 이들 각각의 유압펌프로부터의 작동유가 공급되도록 하여 유압펌프의 압력 손실을 방지함에 따라 연비 효율을 높일 수 있다.In the case of excavation work by operating the arm and the bucket at the same time, the hydraulic oil from the respective hydraulic pump is supplied to the arm cylinder and the bucket cylinder to prevent the pressure loss of the hydraulic pump, thereby improving fuel efficiency.

도 1은 종래 기술에 의한 건설기계의 유압 제어시스템의 유압회로도,1 is a hydraulic circuit diagram of a hydraulic control system of a construction machine according to the prior art,

도 2는 본 발명의 일 실시예에 의한 건설기계의 유압 제어시스템의 유압회로도,2 is a hydraulic circuit diagram of a hydraulic control system of a construction machine according to an embodiment of the present invention;

도 3은 본 발명의 일 실시예에 의한 건설기계의 유압 제어시스템의 제어방법을 나타내는 흐름도,3 is a flow chart showing a control method of a hydraulic control system of a construction machine according to an embodiment of the present invention;

도 4는 본 발명의 일 실시예에 의한 건설기계의 유압 제어시스템에 있어서, 합류취소밸브의 동작을 설명하기 위한 그래프이다.Figure 4 is a graph for explaining the operation of the combined cancellation valve in the hydraulic control system of a construction machine according to an embodiment of the present invention.

이하, 본 발명의 바람직한 실시예를 첨부도면을 참조하여 설명하되, 이는 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 발명을 용이하게 실시할 수 있을 정도로 상세하게 설명하기 위한 것이지, 이로 인해 본 발명의 기술적인 사상 및 범주가 한정되는 것을 의미하지는 않는 것이다.Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are intended to explain in detail enough to enable those skilled in the art to easily carry out the invention, and thus It is not intended that the technical spirit and scope of the invention be limited.

도 2에 도시된 본 발명의 일 실시예에 의한 건설기계의 유압 제어시스템은,Hydraulic control system of a construction machine according to an embodiment of the present invention shown in Figure 2,

가변용량형 제1,2유압펌프(1,2)(이하, "유압펌프" 라고 함)와,Variable displacement first and second hydraulic pumps 1 and 2 (hereinafter referred to as "hydraulic pumps"),

제1유압펌프(1)에 연결되는 아암실린더(3)와,An arm cylinder 3 connected to the first hydraulic pump 1,

제2유압펌프(2)에 연결되는 버킷실린더(미도시됨)와,Bucket cylinder (not shown) connected to the second hydraulic pump (2),

조작량에 따른 제어신호를 각각 출력하는 아암 조작장치(arm joystick)(4) 및 버킷 조작장치(bucket joystick)(미도시됨)와,An arm joystick 4 and a bucket joystick (not shown) for respectively outputting control signals in accordance with the amount of manipulation;

제1유압펌프(1)와 아암실린더(3)사이의 유로에 설치되며, 아암 조작장치(4)의 조작에 따라 절환시 아암실린더(3)의 기동, 정지 및 방향전환을 제어하는 제1아암제어밸브(5)와,The first arm is installed in the flow path between the first hydraulic pump 1 and the arm cylinder 3, and controls the start, stop and direction change of the arm cylinder 3 at the time of switching according to the operation of the arm operating device 4. Control valve (5),

제2유압펌프(2)와 아암실린더(3)사이의 유로에 설치되며, 아암 조작장치(4)의 조작에 따른 제어신호가 설정값을 초과할 경우 절환되어 제2유압펌프(2)의 토출 유량을 아암실린더(3)에 합류시켜 공급하는 제2아암제어밸브(6)와,It is installed in the flow path between the second hydraulic pump (2) and the arm cylinder (3), it is switched when the control signal according to the operation of the arm operating device 4 exceeds the set value to discharge the second hydraulic pump (2) A second arm control valve 6 for joining and supplying a flow rate to the arm cylinder 3;

제2유압펌프(2)와 버킷실린더사이에 유로에 설치되며, 버킷 조작장치의 조작에 따라 절환시 버킷실린더의 기동, 정지 및 방향전환을 제어하는 버킷제어밸브(미도시됨)와,A bucket control valve (not shown) installed in a flow path between the second hydraulic pump 2 and the bucket cylinder and controlling the start, stop and direction change of the bucket cylinder during switching according to the operation of the bucket operating device;

제2유압펌프(2)와 제2아암제어밸브(6)사이의 유로(7)에 설치되며, 아암 조작장치(4) 및 버킷 조작장치를 동시에 조작하고 제1,2유압펌프(1,2)의 토출 압력이 설정값을 초과할 경우 절환되고, 절환시 제2유압펌프(2)로부터 토출되는 유량이 제1유압펌프(1)의 토출 유량에 합류되는 것을 차단하는 합류 취소밸브(conflux cut-off proportional valve)(8)를 포함한다.It is installed in the flow path 7 between the second hydraulic pump 2 and the second arm control valve 6, and simultaneously operates the arm operating device 4 and the bucket operating device and the first and second hydraulic pumps 1, 2 ) Is switched when the discharge pressure exceeds the set value, and the confluence cancellation valve (conflux cut) which blocks the flow rate discharged from the second hydraulic pump 2 from joining the discharge flow rate of the first hydraulic pump 1 at the time of switching. -off proportional valve (8).

본 발명의 일 실시예에 의한 건설기계의 유압 제어시스템은,Hydraulic control system of a construction machine according to an embodiment of the present invention,

가변용량형 제1,2유압펌프(1,2)와, 제1유압펌프(1)에 연결되는 아암실린더(3)와, 제2유압펌프에 연결되는 버킷실린더(미도시됨)와, 조작량에 따라 제어신호를 출력하는 아암 조작장치(4) 및 버킷 조작장치(미도시됨)와, 아암 조작장치(4)의 조작에 따라 아암실린더(3)에 공급되는 작동유를 제어하는 제1아암제어밸브(5)와, 아암 조작장치의 조작에 따른 제어신호가 설정값을 초과할 경우 제2유압펌프(2)로부터 아암실린더(3)에 공급되는 작동유를 제어하는 제2아암제어밸브(6)와, 버킷 조작장치의 조작에 따라 버킷실린더의 구동을 제어하는 버킷제어밸브(미도시됨)와, 아암실린더(3)의 단독 구동시 제2유압펌프(2)의 유량을 제1유압펌프(1)의 유량에 합류시키고 아암실린더(3) 및 버킷실린더를 동시에 구동시킬 경우에 합류기능을 차단하는 합류 취소밸브(8)를 포함하는 유압 시스템에 있어서,Variable displacement first and second hydraulic pumps (1 and 2), arm cylinders (3) connected to the first hydraulic pump (1), bucket cylinders (not shown) connected to the second hydraulic pump, and operation amount The arm operating device 4 and the bucket operating device (not shown) for outputting a control signal according to the present invention, and the first arm control for controlling the hydraulic oil supplied to the arm cylinder 3 in accordance with the operation of the arm operating device 4. The second arm control valve 6 for controlling the hydraulic oil supplied from the second hydraulic pump 2 to the arm cylinder 3 when the control signal according to the operation of the valve 5 and the arm operating device exceeds the set value. And a flow rate of the second hydraulic pump 2 when the arm cylinder 3 is driven alone, and a bucket control valve (not shown) for controlling the operation of the bucket cylinder according to the operation of the bucket operating device. Joining cancellation valve (8) for joining the flow rate of 1) and blocking the joining function when simultaneously operating the arm cylinder (3) and bucket cylinder. In the hydraulic system,

아암 조작장치(4)의 조작량에 따른 아암-인 제어신호, 버킷 조작장치의 조작량에 따른 버킷-인 제어신호 및 제1,2유압펌프(1,2)의 토출 압력을 각각 읽어들이는 제1단계(S100)와,First to read the arm-in control signal according to the operation amount of the arm operating device 4, the bucket-in control signal according to the operation amount of the bucket operating device and the discharge pressure of the first and second hydraulic pumps (1, 2), respectively Step S100,

아암-인 제어신호가 설정값(Ap)을 초과하고, 버킷-인 제어신호가 설정값(Ap)을 초과하는 지를 각각 판단하는 제2단계(S200)와,A second step S200 of determining whether the arm-in control signal exceeds the set value Ap and the bucket-in control signal exceeds the set value Ap;

제1유압펌프(1)의 토출 압력이 설정값(Bp)을 초과하고, 제2유압펌프(2)의 토출 압력이 설정값(Bp)을 초과하는 지를 각각 판단하는 제3단계(S300)와,A third step S300 for determining whether the discharge pressure of the first hydraulic pump 1 exceeds the set value Bp and the discharge pressure of the second hydraulic pump 2 exceeds the set value Bp; ,

아암-인 제어신호와 버킷-인 제어신호가 각각 설정값(Ap)을 초과하고 제1,2유압펌프(1,2)의 토출 압력이 각각 설정값(Bp)을 초과한 경우, 아암-인 제어신호 및 버킷-인 제어신호에 비례하는 제어신호를 합류 취소밸브(8)에 인가시켜 합류기능을 해제시키는 제4단계(S400)를 포함한다.If the arm-in control signal and the bucket-in control signal exceed the set value Ap and the discharge pressure of the first and second hydraulic pumps 1 and 2 respectively exceed the set value Bp, the arm-in And a fourth step S400 of applying a control signal proportional to the control signal and the bucket-in control signal to the merge cancellation valve 8 to release the merge function.

이때, 전술한 합류 취소밸브(8)는,At this time, the above-described joining cancellation valve 8 is

아암 조작장치(4)와 버킷 조작장치를 동시에 조작할 경우 유로(7)를 차단하는 제1상태(Ⅰ)와, 아암 조작장치(4)를 단독으로 조작시 유로(7)를 연결하는 제2상태(Ⅱ)를 구비하여 이뤄진다.A first state (I) for blocking the flow path 7 when the arm operating device 4 and the bucket operating device are operated simultaneously, and a second connecting the flow path 7 when the arm operating device 4 is operated alone. A state (II) is provided.

전술한 합류 취소밸브(8)는,The above-mentioned joining cancellation valve 8 is

합류기능(합류 취소밸브(8)의 제2상태(Ⅱ)를 말함)을 해제시키기 위해 아암 조작장치(4)와 버킷 조작장치의 조작량에 각각 비례하여 이동량이 서서히 증가되도록 제어되는 제1구간(a)과, 아암 조작장치(4)와 버킷 조작장치의 조작량 증가에 따라 합류 차단상태(합류 취소밸브(8)의 제1상태(Ⅰ)를 말함)를 유지하도록 제어되는 제2구간(b)과, 합류기능(합류 취소밸브(8)의 제2상태(Ⅱ)를 말함)으로 전환하기 위해 아암 조작장치(4)와 버킷 조작장치의 조작량에 반비례하여 이동량이 서서히 감소되도록 제어되는 제3구간(c)으로 이뤄진다.The first section (controlled so that the movement amount is gradually increased in proportion to the operation amount of the arm operating device 4 and the bucket operating device, respectively) to release the joining function (referring to the second state (II) of the joining cancellation valve 8) ( a) and a second section (b) controlled to maintain the joining blocking state (referring to the first state (I) of the joining cancellation valve 8) in accordance with an increase in the operation amount of the arm operating device 4 and the bucket operating device. And a third section in which the moving amount is controlled to gradually decrease in inverse proportion to the operation amount of the arm operating device 4 and the bucket operating device for switching to the joining function (referring to the second state (II) of the joining cancellation valve 8). (c).

전술한 합류 취소밸브(8)는,The above-mentioned joining cancellation valve 8 is

전기적 신호의 입력에 따라 절환되어 유로(7)를 개폐시키는 솔레노이드밸브가 사용될 수 있다.A solenoid valve which is switched in accordance with the input of the electrical signal to open and close the flow path 7 may be used.

전술한 합류 취소밸브(8)는,The above-mentioned joining cancellation valve 8 is

아암 조작장치(4) 및 버킷 조작장치의 조작신호에 비례하는 전기적 신호의 입력에 따라 절환되어 유로(7)를 개폐시키는 전자비례제어밸브가 사용될 수 있다.An electronic proportional control valve that is switched in accordance with the input of an electrical signal proportional to the operation signal of the arm operating device 4 and the bucket operating device, to open and close the flow path 7 can be used.

이하에서, 본 발명의 일 실시예에 의한 건설기계의 유압 제어시스템의 사용예를 첨부도면을 참조하여 상세하게 설명한다.Hereinafter, an example of use of the hydraulic control system of a construction machine according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 2에서와 같이, 아암을 단독으로 조작할 경우에, 전술한 아암 조작장치(4)의 아암-인 조작에 따른 제어신호에 의해 제1아암제어밸브(5)를 도면상, 우측방향으로 절환시키므로, 아암 조작장치(4)의 조작량에 따라 제1유압펌프(1)로부터 토출되는 작동유(Q1)는 절환된 제1아암제어밸브(5)를 경유하여 아암실린더(3)의 라지챔버(3a)에 공급된다. 이때 아암실린더(3)의 스몰챔버(3b)로부터 리턴되는 작동유는 제1아암제어밸브(5)를 경유하여 유압탱크(T)로 귀환된다.As shown in Fig. 2, when the arm is operated alone, the first arm control valve 5 is switched to the right in the drawing by the control signal according to the arm-in operation of the arm operating device 4 described above. Therefore, the hydraulic oil Q1 discharged from the first hydraulic pump 1 according to the operation amount of the arm operating device 4 passes through the large chamber 3a of the arm cylinder 3 via the switched first arm control valve 5. Is supplied. At this time, the hydraulic oil returned from the small chamber 3b of the arm cylinder 3 is returned to the hydraulic tank T via the first arm control valve 5.

전술한 아암 조작장치(4)의 조작량이 일정값을 초과할 경우에 제2아암제어밸브(6)가 도면상, 좌측방향으로 절환되므로, 제2유압펌프(2)로부터 토출되는 작동유(Q2)는 합류 취소밸브(8)와 제2아암제어밸브(6)를 차례로 경유하여 아암실린더(2)에 라지챔버(2a)에 합류되어 공급된다(즉 아암실린더(3)의 라지챔버(3a)에 공급되는 유량은 (Q1+Q2)이다).When the operation amount of the arm operating device 4 described above exceeds a predetermined value, the second arm control valve 6 is switched to the left in the drawing, so that the hydraulic oil Q2 discharged from the second hydraulic pump 2 Is supplied to the arm cylinder 2 in the large chamber 2a via the merging canceling valve 8 and the second arm control valve 6 in turn (that is, to the large chamber 3a of the arm cylinder 3). The flow rate supplied is (Q1 + Q2).

따라서, 아암을 단독으로 조작시, 제1유압펌프(1)로부터 아암실린더(3)에 공급되는 작동유(Q1)에 대해, 제2유압펌프(2)로부터 공급되는 작동유(Q2)가 합류되어 공급되므로(Q1+Q2), 아암실린더(3)의 작동 속도를 증대시킬 수 있다.Therefore, when operating the arm alone, the hydraulic oil Q2 supplied from the second hydraulic pump 2 joins and supplies the hydraulic oil Q1 supplied from the first hydraulic pump 1 to the arm cylinder 3. Therefore, the operating speed of the arm cylinder 3 can be increased (Q1 + Q2).

도면에는 미 도시되었으나, 버킷 조작장치의 조작으로 인해 제2유압펌프(2)로부터 공급되는 작동유에 의해 버킷실린더를 구동시킬 수 있다.Although not shown in the drawing, the bucket cylinder may be driven by the hydraulic oil supplied from the second hydraulic pump 2 due to the operation of the bucket operating device.

한편, 아암 조작장치(4) 및 버킷 조작장치(미도시됨)의 조작에 따른 제어신호가 입력되고, 제1,2유압펌프(1,2)의 토출 압력값이 설정값을 초과할 경우에, 실제 굴삭 작업이 이뤄지고 있는 것으로 간주하여 제어기(미도시됨)로부터 합류 취소밸브(8)에 전기적 제어신호(제1,2유압펌프(1,2)의 합류를 차단하는 제어신호를 말함)가 출력된다.On the other hand, when the control signal corresponding to the operation of the arm operating device 4 and the bucket operating device (not shown) is input, and the discharge pressure value of the first and second hydraulic pumps 1 and 2 exceeds the set value, Considering that the actual excavation work is being performed, the electrical control signal (referring to the control signal for blocking the joining of the first and second hydraulic pumps 1 and 2) from the controller (not shown) to the joining cancellation valve 8 is provided. Is output.

이로 인해, 합류 취소밸브(8)를 도면상, 하측방향으로 절환시켜 유로(제2유압펌프(2)와 제2아암제어밸브(6)사이의 공급측 유로를 말함)(7)를 차단하게 되므로, 제2유압펌프(2)로부터의 작동유가 제1유압펌프(1)의 작동유에 더 이상 합류되는 것을 차단하게 된다. 즉 제1유압펌프(1)로부터의 작동유는 제1아암제어밸브(5)를 경유하여 아암실린더(3)에 공급되고, 동시에 제2유압펌프(2)로부터의 작동유는 버킷제어밸브(미도시됨)를 경유하여 버킷실린더에 공급될 수 있다(이때, 버킷실린더에 공급되는 작동유는 아암실린더(3) 작동에 간섭을 받지않고 공급된다).As a result, the confluence cancellation valve 8 is switched downward in the drawing to block the flow path (referring to the supply side flow path between the second hydraulic pump 2 and the second arm control valve 6). In addition, the hydraulic oil from the second hydraulic pump 2 is prevented from further joining the hydraulic oil of the first hydraulic pump 1. That is, the hydraulic oil 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 oil from the second hydraulic pump 2 is a bucket control valve (not shown). Can be supplied to the bucket cylinder (in this case, the hydraulic oil supplied to the bucket cylinder is supplied without being interfered with the operation of the arm cylinder 3).

이하에서, 본 발명의 일 실시예에 의한 건설기계의 유압 제어시스템에 있어서, 합류 취소밸브에 의해 합류기능을 해제시키는 것을 첨부도면을 참조하여 설명한다.In the following, in the hydraulic control system of a construction machine according to an embodiment of the present invention, it will be described with reference to the accompanying drawings to cancel the joining function by the joining cancellation valve.

도 3의 S100에서와 같이, 아암 조작장치(4)의 조작량에 따른 아암-인 제어신호, 버킷 조작장치의 조작량에 따른 버킷-인 제어신호 및 제1,2유압펌프(1,2)의 토출 압력을 각각 읽어들인다.As in S100 of FIG. 3, the arm-in control signal according to the operation amount of the arm operating device 4, the bucket-in control signal according to the operation amount of the bucket operating device, and the discharge of the first and second hydraulic pumps 1 and 2. Read each pressure.

S200에서와 같이, 전술한 아암-인 제어신호가 설정값(Ap)을 초과하고, 버킷 -인 제어신호가 설정값(Ap)을 초과하는 지를 각각 판단한다.As in S200, it is determined whether the above-described arm-in control signal exceeds the set value Ap and the bucket-in control signal exceeds the set value Ap.

S300에서와 같이, 전술한 제1유압펌프(1)의 토출 압력이 설정값(Bp)을 초과하고, 제2유압펌프(2)의 토출 압력이 설정값(Bp)을 초과하는 지를 각각 판단한다.As in S300, it is determined whether the above-described discharge pressure of the first hydraulic pump 1 exceeds the set value Bp and the discharge pressure of the second hydraulic pump 2 exceeds the set value Bp. .

S400에서와 같이, 전술한 아암-인 제어신호와 버킷-인 제어신호가 각각 설정값(Ap)을 초과하고 제1,2유압펌프(1,2)의 토출 압력이 각각 설정값(Bp)을 초과할 경우에, 아암실린더(3) 및 버킷실린더에 부하가 발생된 것으로 인식하여 실제 굴삭작업이 진행되는 것을 판단한다.As in S400, the arm-in control signal and the bucket-in control signal described above exceed the set value Ap and the discharge pressures of the first and second hydraulic pumps 1 and 2 respectively set the set value Bp. When exceeding, it is recognized that loads are generated in the arm cylinder 3 and the bucket cylinder, and it is determined that the actual excavation work is in progress.

이로 인해, 제어기로부터 전술한 아암-인 제어신호 및 버킷-인 제어신호에 비례하는 전기적 제어신호를 합류 취소밸브(8)에 인가시켜 제1상태(Ⅰ)로 절환시킴에 따라, 제2유압펌프(2)와 제2아암제어밸브(6)사이의 유로(7)를 차단하게 된다.Thus, the second hydraulic pump is switched from the controller to the merging canceling valve 8 in proportion to the arm-in control signal and the bucket-in control signal described above to switch to the first state (I). The flow path 7 between the 2 and the second arm control valve 6 is blocked.

이때, 합류 취소밸브(8)에 인가되는 제어신호(S)는 아래의 수식으로 표기된다. S = (아암-인 조작량 × C) 및 (버킷-인 조작량 × D)이다. 이때 C와 D는 굴삭 작업의 다양한 작업조건에 따라 선택된 작업에 적용되도록 미리 정해진 상수이다.At this time, the control signal (S) applied to the merge cancellation valve (8) is expressed by the following formula. S = (arm-in manipulated amount × C) and (bucket-in manipulated amount × D). In this case, C and D are constants predetermined to be applied to the selected work according to various working conditions of the excavation work.

도 4에서와 같이, 전술한 합류 취소밸브(8)는, 합류기능을 해제시키기 위해아암 조작장치(4)와 버킷 조작장치의 조작량에 각각 비례하여 이동량이 서서히 증가되도록 제어되는 제1구간(a)과, 아암 조작장치(4)와 버킷 조작장치의 조작량 증가에 따라 합류 차단상태를 유지하도록 제어되는 제2구간(b)과, 합류기능으로 전환하기 위해 아암 조작장치(4)와 버킷 조작장치의 조작량에 반비례하여 이동량이 서서히 감소되도록 제어되는 제3구간(c)으로 이뤄진다.As shown in FIG. 4, the above-described joining canceling valve 8 includes a first section a in which the moving amount is controlled to gradually increase in proportion to the operating amounts of the arm operating device 4 and the bucket operating device, respectively, in order to release the joining function. ), A second section (b) which is controlled to maintain the joining blocking state as the operation amount of the arm operating device 4 and the bucket operating device increases, and the arm operating device 4 and the bucket operating device to switch to the joining function. The third section (c) is controlled so that the moving amount is gradually reduced in inverse proportion to the operation amount of.

따라서 아암실린더(3)와 버킷실린더를 동시에 조작하여 굴삭 작업을 수행할 경우, 합류 취소밸브(8)에 의해 유로(7)를 차단시켜 합류 기능을 취소시키므로, 제1유압펌프(1)로부터 토출되는 작동유에 대해 제2유압펌프(2)의 작동유를 더 이상 합류시킬 수 없게 된다.Therefore, when performing the excavation work by operating the arm cylinder (3) and the bucket cylinder at the same time, the confluence function is canceled by blocking the flow path (7) by the joining canceling valve (8), discharged from the first hydraulic pump The hydraulic oil of the second hydraulic pump 2 can no longer be joined to the hydraulic oil.

즉, 굴삭 작업과 같이 아암과 버킷을 동시에 조작할 경우에, 제1유압펌프(1)로부터의 작동유는 제1아암제어밸브(5)를 경유하여 아암실린더(3)의 라지챔버(3a)에 공급하고, 동시에 제2유압펌프(2)로부터의 작동유는 버킷제어밸브를 경유하여 버킷실린더의 라지챔버에 공급할 수 있게 된다.That is, when operating the arm and the bucket at the same time as the excavation work, the hydraulic oil from the first hydraulic pump 1 is transferred to the large chamber 3a of the arm cylinder 3 via the first arm control valve 5. At the same time, the hydraulic oil from the second hydraulic pump 2 can be supplied to the large chamber of the bucket cylinder via the bucket control valve.

전술한 바와 같은 본 발명의 일 실시예에 의한 건설기계의 유압 제어시스템에 의하면, 아암과 버킷을 동시에 조작하여 굴삭 작업할 경우에, 아암실린더 및 버킷실린더에서 각각 요구하는 만큼의 파워에 해당되는 유량을 각각의 유압펌프에서 공급하므로, 유압펌프의 압력 손실을 방지하여 연비 효율을 높일 수 있다.According to the hydraulic control system of the construction machine according to an embodiment of the present invention as described above, when the excavation work by operating the arm and the bucket at the same time, the flow rate corresponding to the power required by the arm cylinder and the bucket cylinder, respectively Since it is supplied from each hydraulic pump, it is possible to prevent the pressure loss of the hydraulic pump to increase the fuel efficiency.

본 발명의 실시예에 의한 건설기계의 유압 제어시스템은 굴삭기나 로더에 사용될 수 있으며, 아암과 버킷을 동시에 조작하여 굴삭 작업할 경우에, 아암실린더 및 버킷실린더에 이들 각각의 유압펌프로부터의 작동유가 공급되도록 하여 유압펌프의 압력 손실을 방지함에 따라 연비 효율을 높일 수 있다.The hydraulic control system of the construction machine according to the embodiment of the present invention can be used for an excavator or a loader, and when operating the arm and the bucket at the same time for excavation work, the hydraulic oil from the respective hydraulic pump to the arm cylinder and the bucket cylinder It is possible to increase the fuel efficiency by preventing the pressure loss of the hydraulic pump by supplying.

Claims (6)

가변용량형 제1,2유압펌프와,Variable displacement first and second hydraulic pumps, 상기 제1유압펌프에 연결되는 아암실린더와,An arm cylinder connected to the first hydraulic pump, 상기 제2유압펌프에 연결되는 버킷실린더와,A bucket cylinder connected to the second hydraulic pump, 조작량에 따른 제어신호를 출력하는 아암 조작장치 및 버킷 조작장치와,An arm operating device and a bucket operating device for outputting a control signal according to the operation amount; 상기 제1유압펌프와 아암실린더사이의 유로에 설치되며, 상기 아암 조작장치의 조작에 따라 절환시 아암실린더의 기동, 정지 및 방향전환을 제어하는 제1아암제어밸브와,A first arm control valve installed in a flow path between the first hydraulic pump and the arm cylinder, the first arm control valve controlling the start, stop, and direction change of the arm cylinder during switching according to an operation of the arm operating device; 상기 제2유압펌프와 아암실린더사이의 유로에 설치되며, 상기 아암 조작장치의 조작에 따른 제어신호가 설정값을 초과할 경우 절환되어 제2유압펌프의 토출 유량을 아암실린더에 합류시켜 공급하는 제2아암제어밸브와,Is installed in the flow path between the second hydraulic pump and the arm cylinder, when the control signal according to the operation of the arm operating device exceeds the set value for switching the discharge flow rate of the second hydraulic pump to the arm cylinder to supply 2 arm control valve, 상기 제2유압펌프와 버킷실린더사이에 유로에 설치되며, 상기 버킷 조작장치의 조작에 따라 절환시 버킷실린더의 기동, 정지 및 방향전환을 제어하는 버킷제어밸브와,A bucket control valve installed in a flow path between the second hydraulic pump and the bucket cylinder and controlling the start, stop and direction change of the bucket cylinder at the time of switching according to the operation of the bucket operating device; 상기 제2유압펌프와 제2아암제어밸브사이의 유로에 설치되며, 상기 아암 조작장치 및 버킷 조작장치를 동시에 조작하고 제1,2유압펌프의 토출 압력이 설정값을 초과할 경우 절환되고, 절환시 상기 제2유압펌프로부터 토출되는 유량이 제1유압펌프의 토출 유량에 합류되는 것을 차단하는 합류 취소밸브를 포함하는 것을 특징으로 하는 건설기계의 유압 제어시스템.It is installed in the flow path between the second hydraulic pump and the second arm control valve, and operates the arm operating device and the bucket operating device at the same time, and is switched when the discharge pressure of the first and second hydraulic pump exceeds the set value, switching And a confluence canceling valve for blocking the flow rate discharged from the second hydraulic pump from joining the discharge flow rate of the first hydraulic pump. 가변용량형 제1,2유압펌프와, 제1유압펌프에 연결되는 아암실린더와, 제2유압펌프에 연결되는 버킷실린더와, 조작량에 따라 제어신호를 출력하는 아암 조작장치 및 버킷 조작장치와, 아암 조작장치의 조작에 따라 아암실린더에 공급되는 작동유를 제어하는 제1아암제어밸브와, 아암 조작장치의 조작에 따른 제어신호가 설정값을 초과할 경우 제2유압펌프로부터 아암실린더에 공급되는 작동유를 제어하는 제2아암제어밸브와, 버킷 조작장치의 조작에 따라 버킷실린더의 구동을 제어하는 버킷제어밸브와, 아암실린더의 단독 구동시 제2유압펌프의 유량을 제1유압펌프의 유량에 합류시키고 아암실린더 및 버킷실린더를 동시에 구동시킬 경우에 합류기능을 차단하는 합류 취소밸브를 포함하는 유압 시스템에 있어서:A variable displacement first and second hydraulic pumps, an arm cylinder connected to the first hydraulic pump, a bucket cylinder connected to the second hydraulic pump, an arm operating device and a bucket operating device for outputting a control signal according to the operation amount; A first arm control valve for controlling the hydraulic oil supplied to the arm cylinder according to the operation of the arm operating device, and the hydraulic oil supplied to the arm cylinder from the second hydraulic pump when the control signal according to the operation of the arm operating device exceeds the set value. A second arm control valve for controlling the oil pressure, a bucket control valve for controlling the driving of the bucket cylinder according to the operation of the bucket operating device, and a flow rate of the second hydraulic pump when the arm cylinder is driven alone. In a hydraulic system including a confluence canceling valve which shuts off the confluence function when the arm cylinder and the bucket cylinder are driven simultaneously. 상기 아암 조작장치의 조작량에 따른 아암-인 제어신호, 상기 버킷 조작장치의 조작량에 따른 버킷-인 제어신호 및 상기 제1,2유압펌프의 토출 압력을 각각 읽어들이는 제1단계와,A first step of reading the arm-in control signal according to the operation amount of the arm operating device, the bucket-in control signal according to the operation amount of the bucket operating device, and the discharge pressure of the first and second hydraulic pumps, respectively; 상기 아암-인 제어신호가 설정값을 초과하고, 상기 버킷-인 제어신호가 설정값을 초과하는 지를 각각 판단하는 제2단계와,A second step of determining whether the arm-in control signal exceeds a set value and the bucket-in control signal exceeds a set value, respectively; 상기 제1유압펌프의 토출 압력이 설정값을 초과하고, 상기 제2유압펌프의 토출 압력이 설정값을 초과하는 지를 각각 판단하는 제3단계와,A third step of determining whether the discharge pressure of the first hydraulic pump exceeds a set value and the discharge pressure of the second hydraulic pump exceeds a set value, respectively; 상기 아암-인 제어신호와 버킷-인 제어신호가 각각 설정값을 초과하고 상기 제1,2유압펌프의 토출 압력이 각각 설정값을 초과한 경우, 상기 아암-인 제어신호 및 버킷-인 제어신호에 비례하는 제어신호를 상기 합류 취소밸브에 인가시켜 합류기능을 해제시키는 제4단계를 포함하는 것을 특징으로 하는 건설기계의 유압 제어시스템.When the arm-in control signal and the bucket-in control signal exceed a set value and the discharge pressure of the first and second hydraulic pumps respectively exceed the set value, the arm-in control signal and the bucket-in control signal And a fourth step of releasing the joining function by applying a control signal proportional to the join canceling valve. 제1항에 있어서, 상기 합류 취소밸브는,The method of claim 1, wherein the joining cancellation valve, 상기 아암 조작장치와 버킷 조작장치를 동시에 조작할 경우 상기 유로를 차단하는 제1상태와, 상기 아암 조작장치를 단독으로 조작시 상기 유로를 연결하는 제2상태를 구비하여 이뤄지는 것을 특징으로 하는 건설기계의 유압 제어시스템.And a first state of blocking the flow path when simultaneously operating the arm control device and the bucket control device, and a second state of connecting the flow path when the arm control device is operated alone. Hydraulic control system. 제2항에 있어서, 상기 합류 취소밸브는,The method of claim 2, wherein the joining cancellation valve, 합류기능을 해제시키기 위해 상기 아암 조작장치와 버킷 조작장치의 조작량에 각각 비례하여 이동량이 서서히 증가되도록 제어되는 제1구간과, 상기 아암 조작장치와 버킷 조작장치의 조작량 증가에 따라 합류 차단상태를 유지하도록 제어되는 제2구간과, 합류기능으로 전환하기 위해 상기 아암 조작장치와 버킷 조작장치의 조작량에 반비례하여 이동량이 서서히 감소되도록 제어되는 제3구간으로 이뤄지는 것을 특징으로 하는 건설기계의 유압 제어시스템.Maintains the first blocking section in which the moving amount is gradually increased in proportion to the operation amounts of the arm operating device and the bucket operating device to release the joining function, and the increase of the operating amount of the arm operating device and the bucket operating device. And a second section, which is controlled so as to be controlled, and a third section, which is controlled to gradually reduce the amount of movement in inverse proportion to an operation amount of the arm operating device and the bucket operating device to switch to the joining function. 제1항에 있어서, 상기 합류 취소밸브는,The method of claim 1, wherein the joining cancellation valve, 전기적 신호의 입력에 따라 절환되어 상기 유로를 개폐시키는 솔레노이드밸브가 사용되는 것을 특징으로 하는 건설기계의 유압 제어시스템.Hydraulic control system for a construction machine, characterized in that the solenoid valve is switched in accordance with the input of the electrical signal to open and close the flow path. 제1항에 있어서, 상기 합류 취소밸브는,The method of claim 1, wherein the joining cancellation valve, 상기 아암 조작장치 및 버킷 조작장치의 조작신호에 비례하는 전기적 신호의 입력에 따라 절환되어 상기 유로를 개폐시키는 전자비례제어밸브가 사용되는 것을 특징으로 하는 건설기계의 유압 제어시스템.And an electronic proportional control valve for switching the opening and closing of the flow path in response to input of an electrical signal proportional to an operation signal of the arm operation device and the bucket operation device.
PCT/KR2011/005790 2011-08-09 2011-08-09 Hydraulic control system for construction machinery Ceased WO2013022131A1 (en)

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CN103717914B (en) 2016-05-11
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JP5771332B2 (en) 2015-08-26
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EP2743517A1 (en) 2014-06-18
KR20140050030A (en) 2014-04-28

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