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WO2012033233A1 - Flow rate control device for variable displacement type hydraulic pump for construction equipment - Google Patents

Flow rate control device for variable displacement type hydraulic pump for construction equipment Download PDF

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Publication number
WO2012033233A1
WO2012033233A1 PCT/KR2010/005742 KR2010005742W WO2012033233A1 WO 2012033233 A1 WO2012033233 A1 WO 2012033233A1 KR 2010005742 W KR2010005742 W KR 2010005742W WO 2012033233 A1 WO2012033233 A1 WO 2012033233A1
Authority
WO
WIPO (PCT)
Prior art keywords
flow rate
hydraulic pump
control device
actuator
variable displacement
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/KR2010/005742
Other languages
French (fr)
Korean (ko)
Inventor
이상희
정해균
신흥주
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 JP2013528094A priority Critical patent/JP5719440B2/en
Priority to PCT/KR2010/005742 priority patent/WO2012033233A1/en
Priority to US13/821,452 priority patent/US20130160439A1/en
Priority to KR1020137004529A priority patent/KR20130143552A/en
Priority to EP10857020.1A priority patent/EP2615311A1/en
Priority to CN201080069025.7A priority patent/CN103097743B/en
Publication of WO2012033233A1 publication Critical patent/WO2012033233A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
    • F15B13/0433—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves the pilot valves being pressure control 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
    • E02F9/2221—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
    • E02F9/22—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
    • E02F9/2296—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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/021—Valves for interconnecting the fluid chambers of an actuator
    • 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
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/04—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by varying the output of a pump with 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
    • F15B2211/2053—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
    • F15B2211/255—Flow control functions
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6346—Electronic controllers using input signals representing a state of input means, e.g. joystick position
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/88—Control measures for saving energy

Definitions

  • the present invention relates to a flow rate control device for a variable displacement hydraulic pump for a construction machine including an excavator, and more particularly, a required flow rate required by a plurality of actuators in a complex operation of a construction machine working device by a preset controller.
  • a preset controller By controlling the opening area of the hydraulic pump to be large, it is possible to improve the pressure loss and fuel economy of the hydraulic pump, and in addition, when operating the hydraulic pump, the hydraulic pump discharges a relatively small flow rate compared to the operation amount of each working device.
  • the present invention relates to a flow control device for a variable displacement hydraulic pump for a construction machine, which is improved to be widely formed.
  • Construction machinery including an excavator or hydraulic shovel is provided with a hydraulic circuit so that a work device including a boom or an arm, a bucket and a swing motor is driven by the hydraulic pressure discharged from the hydraulic pump.
  • the hydraulic excavator 1 typically includes a crawler type lower traveling body 2 and an upper swinging structure 3 which is pivotally supported on an upper portion of the lower traveling body 2. And a plurality of working devices mounted on the upper swing body 3, wherein the working device includes a boom 5 and an arm 6 whose proximal ends are supported by one side of the upper swing body 3 so as to be raised and lowered. And a bucket 7 mounted to the distal end of the boom 5, and a swing motor (not shown) that provides power when the upper swing body 3 swings.
  • one variable displacement hydraulic pump is used to supply hydraulic pressure to a plurality of working devices according to the specifications of the equipment.
  • a multiple actuator 14 is controlled by an operating device including an operating lever or a joystick.
  • the sum of the required flow rates for the actuator for the work device during operation is controlled by the discharge flow rate of the hydraulic pump.
  • the discharge flow rate of the variable displacement hydraulic pump during the combined operation is determined by the flow rate required by the actuator of each work device, which is controlled as follows.
  • the first actuator can be interpreted as the boom actuator 14a, the second actuator as the bucket actuator 14c, the third actuator as the swing motor (not shown), and the work device mounted on the hydraulic construction machine is Of course, it can be added.
  • Korean Patent Laid-Open No. 2001-0033699 in the hydraulic excavator flow control device, in order to control the output flow rate of the hydraulic pump to a predetermined distribution flow rate for each hydraulic actuator in consideration of the problem of poor operability in the complex operation Flow control devices have been disclosed.
  • the total absolute value of the required flow rate of the hydraulic actuator is calculated and used as the pump demand flow rate control method. Therefore, it is possible to control the distribution by the distribution flow rate per actuator for the work device while avoiding the sum of the required flow rates of the hydraulic actuators being larger than the maximum discharge flow rate of the hydraulic pump during the complex operation.
  • the hydraulic control method using the absolute sum of the required flow rate of the hydraulic actuator described above can also avoid the disadvantage that the distribution flow rate becomes larger than the required flow rate required by the operation of the control lever or the joystick control device, The problem that pressure loss occurs and the maximum discharge flow rate of the hydraulic pump is quickly reached during the combined operation, and the discharge flow rate control range of the hydraulic pump is reduced by the operating device, and thus, the solution for the problem of inferior operability cannot be solved.
  • the present invention has been made to solve the above-mentioned problems, and the pressure loss is controlled by controlling the discharge flow rate of the hydraulic pump so as to have an effect of widening the opening area according to the matching condition of the required flow rate of the actuator for the work device during the compound operation. It is an object of the present invention to provide a flow control device for a variable displacement hydraulic pump for construction machinery that can reduce and improve fuel efficiency.
  • the flow control apparatus of a variable displacement hydraulic pump for a construction machine according to the present invention includes an engine and an opening.
  • a variable displacement hydraulic pump pumped by the engine to provide hydraulic pressure, and a plurality of work devices including a boom actuator or arm actuator, a bucket actuator and a swing motor, having a swash plate control device for controlling an area.
  • the actuator is installed between the hydraulic pump and the work device actuator, and the spool switching operation to control the hydraulic pressure discharged from the hydraulic pump for the start, stop and swing driving of the work device actuator and the swing motor
  • a device control valve and a sensing amount of an operation device for driving the actuator for the work device A flow rate control unit connected to the quantity detection means, the operation amount detection means and the swash plate control device, and receiving a working device operation signal of the operation device detected by the operation amount detection means to control the discharge flow rate of the hydraulic pump;
  • the required flow rate of each actuator for the work device is determined in advance through the operation device operation signal, and then a square root is calculated by adding the square root to the sum of squares of the required flow rates to determine the discharge flow rate of the hydraulic pump. Control the swash plate control unit.
  • a flow control apparatus for a variable displacement hydraulic pump for a construction machine comprises controlling a plurality of working devices by controlling the opening area of a hydraulic pump based on the square root of the sum of squares of the required flow rates for driving the respective working device actuators.
  • the opening area of the hydraulic pump is relatively larger than the conventional one (meaning that the discharge flow volume of the hydraulic pump is relatively small), which not only reduces the pressure loss of the hydraulic pump but also improves efficiency and fuel economy. There is an advantage to improve.
  • the flow rate control device of the variable displacement hydraulic pump for construction machinery in the operation of the operation device for the combined operation and the discharge flow rate control of the hydraulic pump according to, in the same section, a relatively low flow rate compared to the conventional It is discharged, and there is an advantage that can improve the operability of the equipment by forming a relatively wide operation section of the operation device.
  • FIG. 1 is a perspective view schematically showing a conventional construction machine excavator
  • FIG. 3 is a hydraulic system configuration diagram schematically showing a hydraulic apparatus according to an embodiment of the present invention.
  • FIG. 5 is a flow chart showing the characteristics of the hydraulic pump according to the present invention.
  • the engine 10 is the engine 10,
  • a variable displacement hydraulic pump 12 having a swash plate control device 11 for controlling the opening area and pumped by the engine 10 to provide hydraulic pressure;
  • a plurality of work device actuators 14 including a boom actuator or arm actuator, a bucket actuator and a swing motor,
  • It is connected to the manipulated variable detecting means 17 and the swash plate control device 11, and receives the operating device operating signal of the operating device 16 sensed by the manipulated variable detecting means 17 to discharge the hydraulic pump 12. It comprises a; flow control controller 18 for controlling the flow rate;
  • the flow control controller 18 determines the required flow rate of each work device actuator 15 through the work device operation signal in advance, and then determines the discharge flow rate of the hydraulic pump 12. It is composed of a flow control device of a variable displacement hydraulic pump for construction machinery that controls the swash plate control device 11 by calculating the square root to the sum of the square of each required flow rate.
  • the manipulated variable detecting means 17 is composed of a pilot pressure detection sensor, and the swash plate control device 1 is composed of an electronically controlled proportional valve.
  • the hydraulic excavator (1), the upper revolving body (3) to be pivotally supported on the lower running body (2) of the crawler type and the lower running body (2) and A plurality of work devices are mounted to the upper swing body 3, and typically, the work device includes a boom 5 and an arm 6 whose proximal ends are supported by one side of the upper swing body 3 so as to be raised and lowered.
  • the work device includes a boom 5 and an arm 6 whose proximal ends are supported by one side of the upper swing body 3 so as to be raised and lowered.
  • the boom 5, the arm 6 and the bucket 7 are operated by respective actuators 14 which expand and contract by hydraulic pressure.
  • the flow control device of the variable displacement hydraulic pump for construction machinery according to an embodiment of the present invention, the operator 16, for example, operating lever or the like to drive the actuator 14 for the working device
  • the manipulated amount of the work device operation signal including the pilot pressure or the electrical signal is sensed by the manipulated variable detecting means 17.
  • the flow rate controller 18 connected to the manipulated variable detecting unit 17 and the swash plate control unit 11 receives the operating device operating signal of the manipulated unit 16 detected by the manipulated variable detecting unit 17 to receive the hydraulic pump.
  • the discharge flow rate of (12) is controlled.
  • the flow control controller 18 controls the flow control controller 18,
  • the required flow rate of each work device actuator 15 is determined in advance through the work device operation signal, and then the sum of the squares of the respective required flow rates is determined to determine the discharge flow rate of the hydraulic pump 12.
  • the swash plate control device 11 is controlled by calculating a square root at.
  • the operation device 16 is connected to the pilot pump 13, and the operation amount of the operation device 16 is detected by the pilot pressure detection sensor by the operation amount detection unit 17.
  • the discharge flow rate of the hydraulic pump 12 detects the operation amount of the operating device 16 to calculate the required flow rate for each actuator 14 and the required flow rate calculation
  • the swash plate control by outputting a control signal corresponding to the result determined in step S200 and the square root calculation step S200 to calculate the square root of the value after adding all squares of the required flow rate for each actuator 14 calculated in step S100
  • Controlling apparatus 11 is determined, including the step S300.
  • the flow rate control controller 18 does not simply control the sum of the required flow rates for each of the actuators 14 for the working apparatus during the conventional hydraulic pump discharge flow rate setting, and the manipulation amount detection means 17
  • the square root of the matched value is determined as the discharge flow rate of the hydraulic pump 12 after matching the squares of the required flow rates of the respective actuators 14 for the work device according to the work device operation signal of the operating device 16 detected by It is.
  • the flow rate control controller 18 calculates the discharge flow rate of the hydraulic pump by calculating the square root of the above-described flow rate matching relationship of the actuators for the working device, and controls the output signal of the swash plate control device 11 corresponding to the result. .
  • two working device actuators 14 for example, a boom actuator and a bucket actuator, may be used.
  • the flow rate control method according to the present invention is controlled in a section delayed from the maximum discharge flow rate of the hydraulic pump. Appeared.
  • the flow control device of a variable displacement hydraulic pump for construction machinery is a plurality of When operating the actuator 14 at the same time or when performing a complex operation has a characteristic that the relatively small pump flow rate is discharged to the opening area of the hydraulic pump compared to the prior art.
  • the flow rate control device of the variable displacement hydraulic pump for construction machinery when the operation amount of the operation device 16 during the complex operation is maintained the same, compared to the conventional relatively small flow rate in the hydraulic pump 12 In order to discharge the same flow rate as in the prior art, the control side of the operating device 16 has a characteristic that a relatively large amount of operation amount is required.
  • the flow control device of the variable displacement hydraulic pump for construction machinery provides a wider operating section to the operator than in the prior art By doing so, the operability can be kept soft and stable.
  • the above-described flow rate control apparatus for a variable displacement hydraulic pump for a construction machine according to the present invention has a relatively low flow rate in the same section in the operation of the operation apparatus and the discharge flow rate control of the hydraulic pump according to the operation for the complex operation. It is very useful for the flow control device of the variable displacement hydraulic pump for construction machinery which can discharge and also the operation section of the operating device is relatively wide, thereby improving the operability and reducing the pressure loss of the hydraulic pump.

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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)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

The present invention pertains to a hydraulic pressure control device of a variable displacement type hydraulic pump for construction equipment, wherein operable sections of operation systems are formed in a wide manner while the hydraulic pump discharges a relatively small flow rate compared with the operation amount of the respective operation systems in the case of complex operations, so as to improve the pressure loss and the fuel ratio of the hydraulic pump. The device includes a flow rate controller, which is preferably connected to an operation amount detecting means and a swash plate control device, and receives operation signals from the operation system of a control device that are detected by the operation amount detecting means so as to control the discharge flow rate of the hydraulic pump. In the case of the complex operations, the flow rate controller pre-determines the required flow rate of an actuator for the respective operation systems via the operation signals of the operation systems and subsequently operates the square root of the sum of the squares of the respective required flow rates so as to determine the discharge flow rate of the hydraulic pump, thereby controlling the swash plate control device.

Description

건설기계용 가변용량형 유압펌프의 유량제어장치Flow control device of variable displacement hydraulic pump for construction machinery

본 발명은 굴삭기를 포함하는 건설기계용 가변용량형 유압펌프의 유량제어장치 관한 것이며, 더욱 상세하게는 건설기계용 작업장치의 복합조작시 복수의 액츄에이터에서 필요로 하는 요구유량을 미리 설정된 제어기에 의하여 유압펌프의 개구면적이 크게 되도록 제어함으로써 유압펌프의 압력손실 및 연비를 향상시킬 수 있고, 더불어 복합조작시 유압펌프가 각각의 작업장치의 조작량에 비하여 상대적으로 적은 유량을 토출하면서 조작장치의 조작구간을 넓게 형성할 수 있도록 개량된 건설기계용 가변용량형 유압펌프의 유량제어장치에 관한 것이다.The present invention relates to a flow rate control device for a variable displacement hydraulic pump for a construction machine including an excavator, and more particularly, a required flow rate required by a plurality of actuators in a complex operation of a construction machine working device by a preset controller. By controlling the opening area of the hydraulic pump to be large, it is possible to improve the pressure loss and fuel economy of the hydraulic pump, and in addition, when operating the hydraulic pump, the hydraulic pump discharges a relatively small flow rate compared to the operation amount of each working device. The present invention relates to a flow control device for a variable displacement hydraulic pump for a construction machine, which is improved to be widely formed.

굴삭기나 유압쇼벨을 포함하는 건설기계는 붐이나 암, 버켓 및 선회모터를 포함하는 작업장치가 유압펌프로부터 토출되는 유압에 의하여 구동되도록 유압회로를 구비한다.Construction machinery including an excavator or hydraulic shovel is provided with a hydraulic circuit so that a work device including a boom or an arm, a bucket and a swing motor is driven by the hydraulic pressure discharged from the hydraulic pump.

도 1을 참조하여 설명하면, 통상적으로 유압식 굴삭기(1)는, 크롤러식의 하부주행체(2)와 상기 하부주행체(2)의 상부에 선회구동 가능하게 지지되는 하는 상부선회체(3) 및 상기 상부선회체(3)에 장착되는 복수의 작업장치가 구성되며, 상기 작업장치는 기단부가 상부선회체(3) 일측에 상승 및 하강이 가능하게 지지되는 붐(5) 및 아암(6)과 상기 붐(5)의 선단부에 장착되는 버켓(7), 그리고 상기 상부선회체(3)의 선회시 동력을 제공하는 선회모터(미도시함)를 포함하여 구성된다.Referring to FIG. 1, the hydraulic excavator 1 typically includes a crawler type lower traveling body 2 and an upper swinging structure 3 which is pivotally supported on an upper portion of the lower traveling body 2. And a plurality of working devices mounted on the upper swing body 3, wherein the working device includes a boom 5 and an arm 6 whose proximal ends are supported by one side of the upper swing body 3 so as to be raised and lowered. And a bucket 7 mounted to the distal end of the boom 5, and a swing motor (not shown) that provides power when the upper swing body 3 swings.

장비의 사양에 따라서 복수의 작업장치에 유압을 공급하기 위하여 하나의 가변용량형 유압펌프를 활용하는 경우가 많으며, 작동레버나 조이스틱을 포함하는 조작장치에 의하여 복수의 액츄에이터(14)를 제어하는 복합조작시 작업장치용 액츄에이터에 소요되는 요구유량이 합해진 것을 유압펌프의 토출유량으로 제어한다.In many cases, one variable displacement hydraulic pump is used to supply hydraulic pressure to a plurality of working devices according to the specifications of the equipment. A multiple actuator 14 is controlled by an operating device including an operating lever or a joystick. The sum of the required flow rates for the actuator for the work device during operation is controlled by the discharge flow rate of the hydraulic pump.

즉, 복합조작시 가변용량형 유압펌프의 토출유량은 각각의 작업장치의 액츄에이터에서 요구되는 유량에 의하여 결정되며 이를 정리하면 다음과 같이 제어된다.That is, the discharge flow rate of the variable displacement hydraulic pump during the combined operation is determined by the flow rate required by the actuator of each work device, which is controlled as follows.

"유압펌프 토출유량 =제1 액츄에이터의 요구유량 + 제2 액츄에이터의 요구유량+제3 액츄에이터의 요구유량""Hydraulic pump discharge flow rate = required flow rate of 1st actuator + required flow rate of 2nd actuator + required flow rate of 3rd actuator"

상기 관계식에서, 제1 액츄에이터는 붐액츄에이터(14a), 제2 액츄에이터는 버켓액츄에이터(14c), 제3 액츄에이터는 선회모터(미도시함)로 해석할 수 있으며, 유압식 건설기계에 장착되는 작업장치가 더 부가될 수 있음은 물론이다.In the above relation, the first actuator can be interpreted as the boom actuator 14a, the second actuator as the bucket actuator 14c, the third actuator as the swing motor (not shown), and the work device mounted on the hydraulic construction machine is Of course, it can be added.

전술한 관계식을 이용한 종래의 유압펌프 토출유량 제어는 펌프유로의 개구 면적에서 상대적으로 많은 유량을 토출하게 되어 압력 손실이 더 크게 발생하였다. 그와 같은 압력 손실은 연비에 영향을 주기 때문에 연료 소모가 증대되는 문제점을 야기하였다.In the conventional hydraulic pump discharge flow rate control using the above-described relation, a large amount of flow rate is discharged in the opening area of the pump flow path, resulting in greater pressure loss. Such pressure losses affect fuel economy, leading to increased fuel consumption.

또한, 복합조작시 유압펌프의 최대 토출유량에 빨리 도달하게 되므로 조작장치의 파일럿 압력에 따른 유압펌프의 토출유량 제어 범위가 작아져서 조작성이 떨어지는 문제점이 발생하였다.In addition, since the maximum discharge flow rate of the hydraulic pump is reached at the time of the complex operation, the discharge flow rate control range of the hydraulic pump according to the pilot pressure of the operating device becomes small, resulting in a problem of poor operability.

한편, 한국특허공개 특2001-0033699호에는, 유압셔블용 유량제어장치에 있어서, 복합조작시 조작성이 떨어지는 문제점을 고려하여 유압펌프의 출력유량을 각각의 유압 액츄에이터에 미리 설정된 분배유량으로 제어하기 위한 유량제어장치가 공개되었다.On the other hand, Korean Patent Laid-Open No. 2001-0033699, in the hydraulic excavator flow control device, in order to control the output flow rate of the hydraulic pump to a predetermined distribution flow rate for each hydraulic actuator in consideration of the problem of poor operability in the complex operation Flow control devices have been disclosed.

복합조작시 유압 액츄에이터의 요구유량의 합을 위하여 유압액츄에이터의 요구유량의 절대치 총계를 산출하고, 이것을 펌프요구유량 제어방식으로 사용한다. 따라서, 복합조작시 유압 액츄에이터들의 요구유량의 합이 유압펌프의 최대 토출유량보다 많아지는 것을 피하면서 작업장치용 액츄에이터별 분배유량으로 분배제어할 수 있다.In order to add up the required flow rate of the hydraulic actuator during the complex operation, the total absolute value of the required flow rate of the hydraulic actuator is calculated and used as the pump demand flow rate control method. Therefore, it is possible to control the distribution by the distribution flow rate per actuator for the work device while avoiding the sum of the required flow rates of the hydraulic actuators being larger than the maximum discharge flow rate of the hydraulic pump during the complex operation.

하지만, 전술한 유압액츄에이터의 요구유량의 절대치 총계를 이용한 유압제어방식 역시 분배유량이 조작레버나 조이스틱의 조작장치의 조작에 의해 요구되는 요구유량 보다 커지는 단점을 회피할 수는 있으나, 여전히 복합조작시 압력손실이 발생되는 문제점과 복합조작시 유압펌프의 최대 토출유량에 빨리 도달하게 되어 조작장치에 의한 유압펌프의 토출유량 제어 범위가 작아져서 조작성이 떨어지는 문제점을 해소하기 위한 해결책을 제시하지 못하였다.However, the hydraulic control method using the absolute sum of the required flow rate of the hydraulic actuator described above can also avoid the disadvantage that the distribution flow rate becomes larger than the required flow rate required by the operation of the control lever or the joystick control device, The problem that pressure loss occurs and the maximum discharge flow rate of the hydraulic pump is quickly reached during the combined operation, and the discharge flow rate control range of the hydraulic pump is reduced by the operating device, and thus, the solution for the problem of inferior operability cannot be solved.

따라서, 본 발명은 전술한 문제점을 해결하기 위하여 창출된 것으로, 복합조작시 작업장치용 액츄에이터의 요구유량의 정합 조건에 따라서 개구면적을 넓게 하는 효과를 갖도록 유압펌프의 토출유량을 제어함으로써 압력손실을 저감하고 연비를 향상시킬 수 있는 건설기계용 가변용량형 유압펌프의 유량제어장치를 제공하는데 그 목적이 있다.Accordingly, the present invention has been made to solve the above-mentioned problems, and the pressure loss is controlled by controlling the discharge flow rate of the hydraulic pump so as to have an effect of widening the opening area according to the matching condition of the required flow rate of the actuator for the work device during the compound operation. It is an object of the present invention to provide a flow control device for a variable displacement hydraulic pump for construction machinery that can reduce and improve fuel efficiency.

전술한 목적은 본 발명에 의한 건설기계용 가변용량형 유압펌프의 유량제어장치에 의하여 달성되며, 바람직하게는 본 발명에 의한 건설기계용 가변용량형 유압펌프의 유량제어장치는, 엔진과, 개구면적을 제어하기 위한 사판제어장치를 구비하며, 상기 엔진에 의해 펌핑되어 유압을 제공하는 하나의 가변용량형 유압펌프와, 붐 액츄에이터나 아암 애츄에이터, 버켓 액츄에이터 및 선회모터를 포함하는 복수의 작업장치용 액츄에이터와, 상기 유압펌프와 상기 작업장치용 액츄에이터 사이에 연결 설치되며, 스풀절환시 상기 작업장치용 액츄에이터 및 선회모터의 기동, 정지 및 스윙 구동을 위하여 상기 유압펌프로부터 토출되는 유압을 제어하는 작업장치제어밸브와, 상기 작업장치용 액츄에이터를 구동하기 위하여 조작장치의 조작량을 감지하는 조작량 검출수단과, 상기 조작량 검출수단 및 사판제어장치에 연결설치되며, 상기 조작량 검출수단으로 감지된 조작장치의 작업장치 조작신호를 입력받아 상기 유압펌프의 토출유량을 제어하는 유량제어 컨트롤러;을 포함하여 구성하되,The above object is achieved by a flow control apparatus of a variable displacement hydraulic pump for a construction machine according to the present invention. Preferably, the flow control apparatus of a variable displacement hydraulic pump for a construction machine according to the present invention includes an engine and an opening. A variable displacement hydraulic pump pumped by the engine to provide hydraulic pressure, and a plurality of work devices including a boom actuator or arm actuator, a bucket actuator and a swing motor, having a swash plate control device for controlling an area. The actuator is installed between the hydraulic pump and the work device actuator, and the spool switching operation to control the hydraulic pressure discharged from the hydraulic pump for the start, stop and swing driving of the work device actuator and the swing motor A device control valve and a sensing amount of an operation device for driving the actuator for the work device A flow rate control unit connected to the quantity detection means, the operation amount detection means and the swash plate control device, and receiving a working device operation signal of the operation device detected by the operation amount detection means to control the discharge flow rate of the hydraulic pump; Configure it,

상기 유량제어 컨트롤러가 The flow control controller

복합조작시 상기 작업장치 조작신호를 통하여 각각의 작업장치용 액츄에이터의 요구유량을 미리 결정하고, 이어서 상기 유압펌프의 토출유량을 결정하기 위하여 상기 각각의 요구유량의 제곱의 합에 제곱근을 연산하여 상기 사판제어장치를 제어한다.In the complex operation, the required flow rate of each actuator for the work device is determined in advance through the operation device operation signal, and then a square root is calculated by adding the square root to the sum of squares of the required flow rates to determine the discharge flow rate of the hydraulic pump. Control the swash plate control unit.

본 발명에 의한 건설기계용 가변용량형 유압펌프의 유량제어장치는, 각각의 작업장치용 액츄에이터의 구동을 위한 요구유량의 제곱의 합의 제곱근을 토대로 유압펌프의 개구면적을 제어함으로써, 복수의 작업장치용 액츄에이터를 동시에 조작하거나 복합조작시 종래에 비하여 상대적으로 넓은 유압펌프의 개구면적을 확보(상대적으로 유압펌프의 토출유량이 적음을 의미)함으로써 유압펌프의 압력손실을 저감할 뿐 아니라 효율 및 연비를 향상시키는 장점이 있다.A flow control apparatus for a variable displacement hydraulic pump for a construction machine according to the present invention comprises controlling a plurality of working devices by controlling the opening area of a hydraulic pump based on the square root of the sum of squares of the required flow rates for driving the respective working device actuators. When operating the actuator at the same time or in combination operation, the opening area of the hydraulic pump is relatively larger than the conventional one (meaning that the discharge flow volume of the hydraulic pump is relatively small), which not only reduces the pressure loss of the hydraulic pump but also improves efficiency and fuel economy. There is an advantage to improve.

또한, 본 발명에 의한 건설기계용 가변용량형 유압펌프의 유량제어장치는, 복합조작을 위하여 조작장치의 조작과 그에 따른 유압펌프의 토출유량제어에 있어서, 동일 구간에서 종래에 비하여 상대적으로 적은 유량을 토출하게 되며, 또한 상대적으로 조작장치의 조작구간이 넓게 형성됨으로써 장비의 조작성을 향상시킬 수 있는 장점이 있다.In addition, the flow rate control device of the variable displacement hydraulic pump for construction machinery according to the present invention, in the operation of the operation device for the combined operation and the discharge flow rate control of the hydraulic pump according to, in the same section, a relatively low flow rate compared to the conventional It is discharged, and there is an advantage that can improve the operability of the equipment by forming a relatively wide operation section of the operation device.

도 1은 종래의 건설기계용 굴삭기를 개략적으로 도시한 사시도,1 is a perspective view schematically showing a conventional construction machine excavator,

도 2는 종래의 유압펌프의 토출유량 제어흐름도,2 is a flow rate control flow chart of a conventional hydraulic pump,

도 3은 본 발명의 일실시예에 의한 유압장치를 개략적으로 도시한 유압시스템 구성도,3 is a hydraulic system configuration diagram schematically showing a hydraulic apparatus according to an embodiment of the present invention;

도 4는 본 발명에 의한 유압펌프의 토출유량 제어흐름도,4 is a flow rate control flow chart of the hydraulic pump according to the present invention,

도 5는 본 발명에 의한 유압펌프의 특성을 도시한 유량특성도이다.5 is a flow chart showing the characteristics of the hydraulic pump according to the present invention.

본 명세서 및 청구범위에 사용된 용어나 단어는 통상적이거나 사전적인 의미로 한정해서 해석되어서는 아니 되며, 발명자는 그 자신의 발명을 가장 최선의 방법으로 설명하기 위해 용어의 개념을 적법하게 정의할 수 있다는 원칙에 입각하여 본 발명의 기술적 사상에 부합하는 의미와 개념으로 해석되어야 한다. The terms or words used in this specification and claims are not to be construed as being limited to their ordinary or dictionary meanings, and the inventors may legally define the concept of terms in order to best describe their invention. On the basis of the principle that the present invention should be interpreted as meanings and concepts corresponding to the technical idea of the present invention.

이하 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 상세히 설명하기로 한다. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 3 및 도 4를 참조하면, 본 발명에 의한 건설기계용 가변용량형 유압펌프의 유량제어장치는,3 and 4, the flow rate control apparatus of the variable displacement hydraulic pump for construction machinery according to the present invention,

엔진(10)과,The engine 10,

개구면적을 제어하기 위한 사판제어장치(11)를 구비하며, 상기 엔진(10)에 의해 펌핑되어 유압을 제공하는 하나의 가변용량형 유압펌프(12)와,A variable displacement hydraulic pump 12 having a swash plate control device 11 for controlling the opening area and pumped by the engine 10 to provide hydraulic pressure;

붐 액츄에이터나 아암 애츄에이터, 버켓 액츄에이터 및 선회모터를 포함하는 복수의 작업장치용 액츄에이터(14)와,A plurality of work device actuators 14 including a boom actuator or arm actuator, a bucket actuator and a swing motor,

상기 유압펌프(12)와 상기 작업장치용 액츄에이터(14) 사이에 연결 설치되며, 스풀절환시 상기 작업장치용 액츄에이터 및 선회모터의 기동, 정지 및 스윙 구동을 위하여 상기 유압펌프로부터 토출되는 유압을 제어하는 작업장치제어밸브(15)와, It is connected between the hydraulic pump 12 and the working device actuator 14, and controls the hydraulic pressure discharged from the hydraulic pump for the start, stop and swing drive of the work device actuator and swing motor when the spool is switched Working device control valve 15,

상기 작업장치용 액츄에이터(14)를 구동하기 위하여 조작장치(16)의 조작량을 감지하는 조작량 검출수단(17)과,Manipulated variable detecting means (17) for detecting an manipulated amount of the operating device (16) for driving the actuator (14) for the working device;

상기 조작량 검출수단(17) 및 사판제어장치(11)에 연결설치되며, 상기 조작량 검출수단(17)에 감지된 조작장치(16)의 작업장치 조작신호를 입력받아 상기 유압펌프(12)의 토출유량을 제어하는 유량제어 컨트롤러(18);을 포함하여 구성하되,It is connected to the manipulated variable detecting means 17 and the swash plate control device 11, and receives the operating device operating signal of the operating device 16 sensed by the manipulated variable detecting means 17 to discharge the hydraulic pump 12. It comprises a; flow control controller 18 for controlling the flow rate;

복합조작시 상기 유량제어 컨트롤러(18)가 상기 작업장치 조작신호를 통하여 각각의 작업장치용 액츄에이터(15)의 요구유량을 미리 결정하고, 이어서 상기 유압펌프(12)의 토출유량을 결정하기 위하여 상기 각각의 요구유량의 제곱의 합에 제곱근을 연산하여 상기 사판제어장치(11)를 제어하는 건설기계용 가변용량형 유압펌프의 유량제어장치로 구성된다.In the complex operation, the flow control controller 18 determines the required flow rate of each work device actuator 15 through the work device operation signal in advance, and then determines the discharge flow rate of the hydraulic pump 12. It is composed of a flow control device of a variable displacement hydraulic pump for construction machinery that controls the swash plate control device 11 by calculating the square root to the sum of the square of each required flow rate.

또한, 상기 조작량 검출수단(17)은 파일럿 압력검출센서로 구성되며, 상기 사판제어장치(1)는 전자제어비례밸브로 구성된다.Further, the manipulated variable detecting means 17 is composed of a pilot pressure detection sensor, and the swash plate control device 1 is composed of an electronically controlled proportional valve.

도 3 내지 도 5를 참조하여, 본 발명의 실시에 따른 작동원리를 설명한다.3 to 5, the operation principle according to the embodiment of the present invention will be described.

본 발명의 일실시예에 있어서, 유압식 굴삭기(1)는, 크롤러식의 하부주행체(2)와 상기 하부주행체(2)의 상부에 선회구동 가능하게 지지되는 하는 상부선회체(3) 및 상기 상부선회체(3)에 장착되는 복수의 작업장치가 구성되며, 통상적으로 상기 작업장치는 기단부가 상부선회체(3) 일측에 상승 및 하강이 가능하게 지지되는 붐(5) 및 아암(6)과 상기 붐(5)의 선단부에 장착되는 버켓(7), 그리고 상기 상부선회체(3)의 선회시 동력을 제공하는 선회모터(미도시함)에 의하여 구동함은 종래와 마찬가지이다.In one embodiment of the present invention, the hydraulic excavator (1), the upper revolving body (3) to be pivotally supported on the lower running body (2) of the crawler type and the lower running body (2) and A plurality of work devices are mounted to the upper swing body 3, and typically, the work device includes a boom 5 and an arm 6 whose proximal ends are supported by one side of the upper swing body 3 so as to be raised and lowered. ) Is driven by a bucket 7 mounted on the tip of the boom 5 and a swing motor (not shown) that provides power when the upper swing body 3 swings.

또한, 상기 붐(5)과 아암(6) 및 버켓(7)은 유압에 의해 신장 및 수축구동하는 각각의 액츄에이터(14)들에 의하여 작동된다.In addition, the boom 5, the arm 6 and the bucket 7 are operated by respective actuators 14 which expand and contract by hydraulic pressure.

특히, 본 발명의 일실시예에 따른 건설기계용 가변용량형 유압펌프의 유량제어장치는, 작업자가 상기 작업장치용 액츄에이터(14)를 구동하기 위하여 조작장치(16), 예를 들면 조작레버나 조이스틱을 조작시 파일럿 압력이나 전기적 신호를 포함하는 작업장치 조작신호의 조작량이 조작량 검출수단(17)에 의하여 감지된다.In particular, the flow control device of the variable displacement hydraulic pump for construction machinery according to an embodiment of the present invention, the operator 16, for example, operating lever or the like to drive the actuator 14 for the working device When the joystick is operated, the manipulated amount of the work device operation signal including the pilot pressure or the electrical signal is sensed by the manipulated variable detecting means 17.

상기 조작량 검출수단(17) 및 사판제어장치(11)에 연결설치된 상기 유량제어 컨트롤러(18)가 조작량 검출수단(17)에 감지된 조작장치(16)의 작업장치 조작신호를 입력받아 상기 유압펌프(12)의 토출유량을 제어한다.The flow rate controller 18 connected to the manipulated variable detecting unit 17 and the swash plate control unit 11 receives the operating device operating signal of the manipulated unit 16 detected by the manipulated variable detecting unit 17 to receive the hydraulic pump. The discharge flow rate of (12) is controlled.

바람직하게는, 상기 유량제어 컨트롤러(18)는, Preferably, the flow control controller 18,

복합조작시 상기 작업장치 조작신호를 통하여 각각의 작업장치용 액츄에이터(15)의 요구유량을 미리 결정하고, 이어서 상기 유압펌프(12)의 토출유량을 결정하기 위하여 상기 각각의 요구유량의 제곱의 합에 제곱근을 연산하여 상기 사판제어장치(11)를 제어한다.In the combined operation, the required flow rate of each work device actuator 15 is determined in advance through the work device operation signal, and then the sum of the squares of the respective required flow rates is determined to determine the discharge flow rate of the hydraulic pump 12. The swash plate control device 11 is controlled by calculating a square root at.

상기 조작장치(16)는 파일럿 펌프(13)에 연결설치되며, 상기 조작량 검출수단(17)에 의한 파일럿 압력검출센서에서 상기 조작장치(16)의 조작량이 검출된다.The operation device 16 is connected to the pilot pump 13, and the operation amount of the operation device 16 is detected by the pilot pressure detection sensor by the operation amount detection unit 17.

본 발명의 일실시예에 따르면, 상기 유압펌프(12)의 토출유량은 상기 조작장치(16)의 조작량을 검출하여 각각의 액츄에이터(14)별 요구유량을 산출하는 단계 S100과, 상기 요구유량 산출단계 S100에서 산출된 각각의 액츄에이터(14)별 요구유량을 모두 제곱하여 더한 이후 그 값의 제곱근을 연산하는 단계 S200 및 상기 제곱근 연산 단계 S200에서 결정되는 결과에 상응하는 제어신호로 출력하여 상기 사판제어장치(11)를 제어하는 단계 S300을 포함하여 결정된다.According to one embodiment of the present invention, the discharge flow rate of the hydraulic pump 12 detects the operation amount of the operating device 16 to calculate the required flow rate for each actuator 14 and the required flow rate calculation The swash plate control by outputting a control signal corresponding to the result determined in step S200 and the square root calculation step S200 to calculate the square root of the value after adding all squares of the required flow rate for each actuator 14 calculated in step S100 Controlling apparatus 11 is determined, including the step S300.

구체적으로, 본 발명에 의한 유량제어 컨트롤러(18)는, 종래의 유압펌프 토출유량 설정시 단순하게 각각의 작업장치용 액츄에이터(14)별로 요구유량을 합하여 제어하지 않으며, 상기 조작량 검출수단(17)에서 감지되는 조작장치(16)의 작업장치 조작신호에 따른 각각의 작업장치용 액츄에이터(14)들의 요구유량의 제곱을 정합한 이후에 정합된 값의 제곱근을 유압펌프(12)의 토출유량으로 결정하는 것이다.Specifically, the flow rate control controller 18 according to the present invention does not simply control the sum of the required flow rates for each of the actuators 14 for the working apparatus during the conventional hydraulic pump discharge flow rate setting, and the manipulation amount detection means 17 The square root of the matched value is determined as the discharge flow rate of the hydraulic pump 12 after matching the squares of the required flow rates of the respective actuators 14 for the work device according to the work device operation signal of the operating device 16 detected by It is.

즉, 본 발명에 의한 유량제어 컨트롤러(18)에서 결정되는 유압펌프의 토출유량은 아래에 기재된 관계식으로 정리할 수 있다.That is, the discharge flow rate of the hydraulic pump determined by the flow control controller 18 according to the present invention can be summarized by the relational expression described below.

작업장치용 액츄에이터들의 요구유량 정합 관계식 = 제1 액츄에이터의 요구유량2 + 제2 액츄에이터의 요구유량2 + 제3 액츄에이터의 요구유량2...Required flow rate matching equation of actuators for work equipment = Required flow rate of the first actuator 2 + Required flow rate of the second actuator 2 + Required flow rate of the third actuator 2 ...

이때, 상기 유량제어 컨트롤러(18)는 유압펌프의 토출유량은 전술한 작업장치용 액츄에이터들의 요구유량 정합 관계식의 제곱근을 연산하여, 그 결과에 상응하는 사판제어장치(11)의 출력신호로 제어한다.At this time, the flow rate control controller 18 calculates the discharge flow rate of the hydraulic pump by calculating the square root of the above-described flow rate matching relationship of the actuators for the working device, and controls the output signal of the swash plate control device 11 corresponding to the result. .

유압펌프의 토출유량 관계식 = Relation of discharge flow rate of hydraulic pump =

Figure PCTKR2010005742-appb-I000001
Figure PCTKR2010005742-appb-I000001

이와 같은, 본 발명에 의한 유량제어 컨트롤러(18)에 의해 제어되는 유압펌프(12)의 토출유량 특성을 비교하기 위하여, 2개의 작업장치용 액츄에이터(14), 예를 들면 붐 액츄에이터와 버켓 액츄에이터를 복합구동시, 종래의 액츄에이터 요구유량의 단순합산 유량제어방식과 본 발명의 의한 유량제어방식의 유량특성을 비교하면, 본 발명에 의한 유량제어방식이 유압펌프의 최대토출유량 보다 지연된 구간에서 제어되는 것으로 나타났다.In order to compare the discharge flow rate characteristics of the hydraulic pump 12 controlled by the flow control controller 18 according to the present invention, two working device actuators 14, for example, a boom actuator and a bucket actuator, may be used. In the combined operation, comparing the flow characteristics of the conventional simple flow rate control method with the required flow rate of the actuator and the flow rate control method according to the present invention, the flow rate control method according to the present invention is controlled in a section delayed from the maximum discharge flow rate of the hydraulic pump. Appeared.

즉, 도 5에 도시된 바와 같이, 유압펌프(12)의 최대토출유량 성능이 동일하게 설정된 경우, 본 발명에 의한 유압펌프의 토출유량제어 특성B이 종래의 단순합산 유량제어방식 A에 비하여 기울기가 작으며, 최대유량에 도달하는 구간이 지연되어 나타난다.That is, as shown in Figure 5, when the maximum discharge flow rate performance of the hydraulic pump 12 is set to the same, the discharge flow rate control characteristic B of the hydraulic pump according to the present invention is inclined compared to the conventional simple sum flow rate control method A Is small and the section reaching the maximum flow rate is delayed.

이는 단순하게 하나의 액츄에이터(14)를 단독으로 조작할 경우에는 종래의 유량제어방식과 차이가 없음을 의미하며, 본 발명에 의한 건설기계용 가변용량형 유압펌프의 유량제어장치는 2 이상의 복수의 액츄에이터(14)를 동시에 조작할 경우 또는 복합조작을 수행할 경우에 유압펌프의 개구 면적에 대해 종래 기술 대비 상대적으로 적은 펌프 유량이 토출되도록 제어되는 특성을 가진다.This simply means that when operating one actuator 14 alone, there is no difference from the conventional flow control method, the flow control device of a variable displacement hydraulic pump for construction machinery according to the present invention is a plurality of When operating the actuator 14 at the same time or when performing a complex operation has a characteristic that the relatively small pump flow rate is discharged to the opening area of the hydraulic pump compared to the prior art.

부연하면, 유압펌프(12)의 동일한 토출유량에 대하여 상대적으로 넓은 개구 면적을 확보하게 되며, 그에 따라 압력손실이 크게 저감될 뿐 아니라 유압펌프(12)의 효율 및 연비향상을 얻을 수 있는 것이다.In other words, it is possible to secure a relatively wide opening area for the same discharge flow rate of the hydraulic pump 12, thereby not only significantly reducing the pressure loss, but also improving the efficiency and fuel efficiency of the hydraulic pump 12.

한편, 본 발명에 의한 건설기계용 가변용량형 유압펌프의 유량제어장치는, 복합조작시 조작장치(16)의 조작량을 동일하게 유지할 경우, 종래에 비하여 상대적으로 적은 유량을 유압펌프(12)에서 토출하게 되며, 조작장치(16)의 제어측면에서는 종래와 동일한 유량을 토출하기 위해서 상대적으로 종래에 비하여 많은 조작량이 요구되는 특성을 가진다.On the other hand, the flow rate control device of the variable displacement hydraulic pump for construction machinery according to the present invention, when the operation amount of the operation device 16 during the complex operation is maintained the same, compared to the conventional relatively small flow rate in the hydraulic pump 12 In order to discharge the same flow rate as in the prior art, the control side of the operating device 16 has a characteristic that a relatively large amount of operation amount is required.

그와 같은 특성은, 조작레버나 조이스틱을 포함하는 조작장치(16)의 조작에 있어서, 본 발명에 의한 건설기계용 가변용량형 유압펌프의 유량제어장치는 종래에 비하여 넓은 조작 구간을 작업자에게 제공함으로써 조작성을 부드럽고 안정되게 유지할 수 있는 것이다.Such characteristics, in the operation of the operating device 16 including the operating lever and the joystick, the flow control device of the variable displacement hydraulic pump for construction machinery according to the present invention provides a wider operating section to the operator than in the prior art By doing so, the operability can be kept soft and stable.

전술한 본 발명에 의한 건설기계용 가변용량형 유압펌프의 유량제어장치는, 복합조작을 위하여 조작장치의 조작과 그에 따른 유압펌프의 토출유량제어에 있어서 동일 구간에서 종래에 비하여 상대적으로 적은 유량을 토출하며, 또한 상대적으로 조작장치의 조작구간이 넓게 형성됨으로써 조작성 향상 및 유압펌프의 압력손실을 저감할 수 있는 건설기계용 가변용량형 유압펌프의 유량제어장치에 매우 유용하다.The above-described flow rate control apparatus for a variable displacement hydraulic pump for a construction machine according to the present invention has a relatively low flow rate in the same section in the operation of the operation apparatus and the discharge flow rate control of the hydraulic pump according to the operation for the complex operation. It is very useful for the flow control device of the variable displacement hydraulic pump for construction machinery which can discharge and also the operation section of the operating device is relatively wide, thereby improving the operability and reducing the pressure loss of the hydraulic pump.

Claims (3)

엔진과,Engine, 개구면적을 제어하기 위한 사판제어장치를 구비하며, 상기 엔진에 의해 펌핑되어 유압을 제공하는 하나의 가변용량형 유압펌프와,A variable displacement hydraulic pump having a swash plate control device for controlling the opening area, the pump being pumped by the engine to provide hydraulic pressure; 붐 액츄에이터나 아암 애츄에이터, 버켓 액츄에이터 및 선회모터를 포함하는 복수의 작업장치용 액츄에이터와,Actuators for a plurality of work devices, including boom actuators, arm actuators, bucket actuators, and swing motors; 상기 유압펌프와 상기 작업장치용 액츄에이터 사이에 연결 설치되며, 스풀절환시 상기 작업장치용 액츄에이터 및 선회모터의 기동, 정지 및 스윙 구동을 위하여 상기 유압펌프로부터 토출되는 유압을 제어하는 작업장치제어밸브와,It is connected between the hydraulic pump and the actuator for the work device, and the work device control valve for controlling the hydraulic pressure discharged from the hydraulic pump for the start, stop and swing drive of the actuator and the swing motor for the work device when the spool switching; , 상기 작업장치용 액츄에이터를 구동하기 위하여 조작장치의 조작량을 감지하는 조작량 검출수단과,Manipulated variable detecting means for detecting an manipulated amount of an operating device for driving the actuator for the working device; 상기 조작량 검출수단 및 사판제어장치에 연결설치되며, 상기 조작량 검출수단으로 감지된 조작장치의 작업장치 조작신호를 입력받아 상기 유압펌프의 토출유량을 제어하는 유량제어 컨트롤러;을 포함하여 구성하되,And a flow rate controller connected to the manipulated variable detecting means and the swash plate control device and receiving a work device operation signal of the manipulated device detected by the manipulated variable detecting means to control the discharge flow rate of the hydraulic pump. 상기 유량제어 컨트롤러가 The flow control controller 복합조작시 상기 작업장치 조작신호를 통하여 각각의 작업장치용 액츄에이터의 요구유량을 미리 결정하고, 이어서 상기 유압펌프의 토출유량을 결정하기 위하여 상기 각각의 요구유량의 제곱의 합에 제곱근을 연산하여 상기 사판제어장치를 제어하는 것을 특징으로 하는 건설기계용 가변용량형 유압펌프의 유량제어장치.In the complex operation, the required flow rate of each actuator for the work device is determined in advance through the operation device operation signal, and then a square root is calculated by adding the square root to the sum of squares of the required flow rates to determine the discharge flow rate of the hydraulic pump. Flow rate control device of a variable displacement hydraulic pump for construction machinery, characterized in that for controlling the swash plate control device. 청구항 1에 있어서, The method according to claim 1, 상기 조작량 검출수단이 파일럿 압력검출센서로 구성되는 것을 특징으로 하는 건설기계용 가변용량형 유압펌프의 유량제어장치.And said manipulated value detecting means comprises a pilot pressure detecting sensor. 청구항 1에 있어서,The method according to claim 1, 상기 사판제어장치가 전자제어비례밸브로 구성되는 것을 특징으로 하는 건설기계용 가변용량형 유압펌프의 유량제어장치.The swash plate control device is a flow control device of a variable displacement hydraulic pump for construction machinery, characterized in that the electronic control proportional valve.
PCT/KR2010/005742 2010-09-09 2010-09-09 Flow rate control device for variable displacement type hydraulic pump for construction equipment Ceased WO2012033233A1 (en)

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JP2013528094A JP5719440B2 (en) 2010-09-09 2010-09-09 Flow control device for variable displacement hydraulic pump for construction machinery
PCT/KR2010/005742 WO2012033233A1 (en) 2010-09-09 2010-09-09 Flow rate control device for variable displacement type hydraulic pump for construction equipment
US13/821,452 US20130160439A1 (en) 2010-09-09 2010-09-09 Flow rate control device for variable displacement type hydraulic pump for construction equipment
KR1020137004529A KR20130143552A (en) 2010-09-09 2010-09-09 Flow rate control device for variable displacement type hydraulic pump for construction equipment
EP10857020.1A EP2615311A1 (en) 2010-09-09 2010-09-09 Flow rate control device for variable displacement type hydraulic pump for construction equipment
CN201080069025.7A CN103097743B (en) 2010-09-09 2010-09-09 Flow control device for variable displacement hydraulic pumps for construction equipment

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JP5719440B2 (en) 2015-05-20
CN103097743A (en) 2013-05-08
KR20130143552A (en) 2013-12-31
US20130160439A1 (en) 2013-06-27
CN103097743B (en) 2016-03-02
JP2013543086A (en) 2013-11-28

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