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 PDFInfo
- 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
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- WO
- WIPO (PCT)
- Prior art keywords
- flow rate
- hydraulic pump
- control device
- actuator
- variable displacement
- Prior art date
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 24
- 238000010276 construction Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 claims description 9
- 239000000446 fuel Substances 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 description 7
- 230000003111 delayed effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Images
Classifications
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (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
Description
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 controller복합조작시 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.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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JP2013528094A JP5719440B2 (en) | 2010-09-09 | 2010-09-09 | Flow control device for variable displacement hydraulic pump for construction machinery |
US13/821,452 US20130160439A1 (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 | For the flow control device of the variable displacement type hydraulic pump of 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 |
PCT/KR2010/005742 WO2012033233A1 (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 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/KR2010/005742 WO2012033233A1 (en) | 2010-09-09 | 2010-09-09 | Flow rate control device for variable displacement type hydraulic pump for construction equipment |
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WO2012033233A1 true WO2012033233A1 (en) | 2012-03-15 |
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PCT/KR2010/005742 WO2012033233A1 (en) | 2010-09-09 | 2010-09-09 | Flow rate control device for variable displacement type hydraulic pump for construction equipment |
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US (1) | US20130160439A1 (en) |
EP (1) | EP2615311A1 (en) |
JP (1) | JP5719440B2 (en) |
KR (1) | KR20130143552A (en) |
CN (1) | CN103097743B (en) |
WO (1) | WO2012033233A1 (en) |
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WO2014081053A1 (en) | 2012-11-23 | 2014-05-30 | 볼보 컨스트럭션 이큅먼트 에이비 | Apparatus and method for controlling preferential function of construction machine |
CA2897003C (en) | 2013-01-18 | 2018-01-02 | Volvo Construction Equipment Ab | Flow control device and flow control method for construction machine |
CN107208398B (en) * | 2014-12-10 | 2020-04-14 | 沃尔沃建筑设备公司 | Method for compensating the hydraulic pump flow of a construction machine |
US9869311B2 (en) * | 2015-05-19 | 2018-01-16 | Caterpillar Inc. | System for estimating a displacement of a pump |
CN105240349B (en) * | 2015-09-21 | 2018-01-26 | 北京中车重工机械有限公司 | A kind of rotary drilling rig and its hydraulic control system |
JP2018021589A (en) | 2016-08-02 | 2018-02-08 | キャタピラー エス エー アール エル | Pump control device and pump control method |
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US11346081B2 (en) | 2018-03-15 | 2022-05-31 | Hitachi Construction Machinery Co., Ltd. | Construction machine |
JP7221101B2 (en) * | 2019-03-20 | 2023-02-13 | 日立建機株式会社 | excavator |
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JP7153627B2 (en) * | 2019-10-31 | 2022-10-14 | 日立建機株式会社 | Work machine and perimeter monitoring system |
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- 2010-09-09 US US13/821,452 patent/US20130160439A1/en not_active Abandoned
- 2010-09-09 WO PCT/KR2010/005742 patent/WO2012033233A1/en active Application Filing
- 2010-09-09 KR KR1020137004529A patent/KR20130143552A/en not_active Application Discontinuation
- 2010-09-09 CN CN201080069025.7A patent/CN103097743B/en not_active Expired - Fee Related
- 2010-09-09 EP EP10857020.1A patent/EP2615311A1/en not_active Withdrawn
- 2010-09-09 JP JP2013528094A patent/JP5719440B2/en not_active Expired - Fee Related
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JPH06159319A (en) * | 1992-11-25 | 1994-06-07 | Hitachi Constr Mach Co Ltd | Pump discharging flow rate control device for hydraulically operating machine |
JP2000027803A (en) * | 1998-07-08 | 2000-01-25 | Uchida Hydraulics Co Ltd | Bleed-off control method using closed center type solenoid proportional directional control valve |
KR20010033699A (en) | 1998-11-12 | 2001-04-25 | 가와이 기요카즈 | Hydraulic Control Device For Work Machine |
KR100637675B1 (en) * | 2004-09-15 | 2006-10-25 | 주식회사 파카한일유압 | Regulator for meter-out flow control of hydraulic control valve |
JP2007205464A (en) * | 2006-02-01 | 2007-08-16 | Bosch Rexroth Corp | Control method of variable displacement pump |
KR20090059188A (en) * | 2007-12-06 | 2009-06-11 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | Pressure compensation hydraulic circuit of control engine revolution of excavator |
Also Published As
Publication number | Publication date |
---|---|
KR20130143552A (en) | 2013-12-31 |
US20130160439A1 (en) | 2013-06-27 |
CN103097743A (en) | 2013-05-08 |
JP2013543086A (en) | 2013-11-28 |
EP2615311A1 (en) | 2013-07-17 |
CN103097743B (en) | 2016-03-02 |
JP5719440B2 (en) | 2015-05-20 |
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