WO2016084992A1 - Pilot pressure controlling device for construction machinery, and method of controlling same - Google Patents

Pilot pressure controlling device for construction machinery, and method of controlling same Download PDF

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Publication number
WO2016084992A1
WO2016084992A1 PCT/KR2014/011358 KR2014011358W WO2016084992A1 WO 2016084992 A1 WO2016084992 A1 WO 2016084992A1 KR 2014011358 W KR2014011358 W KR 2014011358W WO 2016084992 A1 WO2016084992 A1 WO 2016084992A1
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Prior art keywords
pressure
pilot
hydraulic
control valve
hydraulic pump
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PCT/KR2014/011358
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French (fr)
Korean (ko)
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김진욱
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볼보 컨스트럭션 이큅먼트 에이비
김진욱
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Priority to PCT/KR2014/011358 priority Critical patent/WO2016084992A1/en
Publication of WO2016084992A1 publication Critical patent/WO2016084992A1/en

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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

Definitions

  • the present invention relates to a pilot pressure control device, and more specifically, to a construction machine for controlling the pilot pressure applied to the control valve (MCV) when operating the operating lever (RCV) to operate the work device such as the arm And a control method thereof.
  • MCV control valve
  • RCV operating lever
  • a positive control system for controlling the discharge flow rate of the hydraulic pump in proportion to the pilot pressure applied to the control valve (MCV) when operating the operation lever;
  • a negative control system is used to control the discharge flow rate of the hydraulic pump in inverse proportion to the pressure formed on the downstream side of the control valve.
  • 1 is a graph showing that the pressure of the hydraulic pump and the pressure of the arm working device by the operation of the operating lever.
  • the pilot pressure corresponding to the operation amount (refer to the lower graph curve a) is the arm.
  • the pilot residual pressure corresponding to the arm-out pilot pressure (referred to graph curve b at the bottom) is instantaneously input to the inlet port of the cylinder control valve and at the same time to the outlet port of the control valve for the arm cylinder. It is destroyed after.
  • a peak pressure exceeding an arbitrary pressure is instantaneously generated in the hydraulic fluid on the first and second hydraulic pumps (referring to the upper graph curve c).
  • the pressure of the large chamber side of the arm cylinder is generated at the same time as the hydraulic oil pressure of the first and second hydraulic pumps.
  • the inlet port of the control valve is provided.
  • the pilot pressure corresponding to the residual pressure is also generated in the corresponding outlet port.
  • the section in which the spool of the control valve is switched is moved by the differential pressure of the pilot pressure corresponding to the target pilot pressure and the residual pressure generated in the outlet port by the operation of the operation lever.
  • the discharge flow rate Q of the hydraulic pump is discharged corresponding to the pilot pressure Pi by the operation of the operation lever.
  • FIG. 2 is a schematic diagram of a pilot pressure control device according to the prior art
  • FIG. 3 is a schematic diagram for explaining pilot pressure generated in the arm driving spool.
  • the pilot pressure input to the control valve 4 is sensed by the pressure sensor 3, and the discharge flow rate of the hydraulic pump is controlled to correspond to the pilot pressure detected by the pressure sensor (3).
  • the hydraulic oil of the hydraulic pump is discharged to correspond to the relatively high pilot pressure selected by the shuttle valve 2. 2
  • the hydraulic oil of the hydraulic pump is supplied to the control valve 4 irrespective of switching of the spool according to the residual pressure of the control valve 4.
  • the pilot pressure corresponding to the operation amount of the operation lever 1 is input to the arm-in port of the control valve 4 spool.
  • back pressure occurs on the arm-out side input to the control valve 4, and arm-in and arm The spool is switched only by the differential pressure of the out pilot pressure.
  • the spool of the control valve 4 is not switched corresponding to the pilot pressure as much as the operation lever 1 is operated. Therefore, the spool opening area of the control valve 4 is small so that the same hydraulic fluid is used in the hydraulic pump. There is a problem in that excessive pressure is generated in the control valve 4 even when is supplied.
  • the present invention is to solve the above-described problems, when applying the pilot pressure by operating the operating lever to the control valve, the hydraulic pressure is applied as much as the differential pressure generated in the first hydraulic pressure port and the second hydraulic pressure port of the control valve
  • An object of the present invention is to provide a pilot pressure control device for a construction machine capable of discharging from a pump and a control method thereof.
  • a control valve installed in a flow path of the hydraulic pump and controlling hydraulic oil supplied to the hydraulic actuator during switching;
  • a first pressure sensor for sensing a pilot pressure applied to the first hydraulic pressure port of the control valve and a second pressure sensor for sensing a pilot residual pressure drained from the second hydraulic pressure port of the control valve when the operation lever is operated;
  • a controller for inputting a control signal to the regulator to discharge a flow rate corresponding to the differential pressure between the pilot pressure detected by the first pressure sensor and the pilot residual pressure detected by the second pressure sensor from the hydraulic pump.
  • Hydraulic pump Hydraulic pump; A regulator for controlling the swash plate tilt angle to control the discharge flow rate of the hydraulic pump; A hydraulic actuator connected to the hydraulic pump; Operation lever; A control valve for controlling hydraulic oil supplied to the hydraulic actuator during switching; First and second pressure sensors for sensing a pilot pressure applied to the control valve and a pilot residual pressure drained when the operation lever is operated;
  • pilot pressure control method for a construction machine comprising: a controller connected to the first and second pressure sensors and a regulator:
  • the pilot pressure applied to the first hydraulic pressure port of the control valve by the operation of the operation lever is sensed by the first pressure sensor, and the pilot residual pressure drained from the second hydraulic pressure port of the control valve is measured by the second pressure sensor. Detecting by;
  • pilot residual pressure is generated in the second hydraulic pressure port of the control valve when the operation lever is operated, a flow rate corresponding to the differential pressure between the pilot pressure detected by the first and second pressure sensors and the pilot residual pressure is discharged from the hydraulic pump. And providing a control signal to the regulator to provide a pilot pressure control method for a construction machine.
  • the regulator When no pilot residual pressure is generated in the second hydraulic pressure port of the control valve when the operation lever is operated, the regulator is controlled to discharge the flow rate corresponding to the pilot pressure detected by the first pressure sensor from the hydraulic pump. Inputting a signal; characterized in that it comprises a.
  • the hydraulic actuator is a hydraulic actuator
  • the hydraulic pump is a hydraulic pump.
  • the positive control method is characterized in that the discharge flow rate is controlled in proportion to the pilot pressure applied to the control valve when the operation lever is operated.
  • the control is performed.
  • the spool of the valve By restricting the spool of the valve, it is possible to prevent excessive pressure from occurring in the control valve and the hydraulic pump, and to prevent fuel consumption from being lost due to energy loss.
  • 1 is a graph showing that the pressure of the hydraulic pump and the pressure of the arm working device by the operation of the operating lever
  • FIG. 2 is a schematic view of a pilot pressure control apparatus according to the prior art
  • Figure 3 is a schematic diagram for explaining the pilot pressure generated in the arm drive spool
  • Figure 4 is a schematic diagram for explaining a pilot pressure control device for a construction machine according to an embodiment of the present invention
  • FIG. 5 is a graph for explaining the discharge flow rate control of the hydraulic pump in the pilot pressure control apparatus for construction machinery according to an embodiment of the present invention
  • FIG. 6 is a flow chart showing a pilot pressure control method for a construction machine according to an embodiment of the present invention.
  • Figure 4 is a schematic diagram for explaining a pilot pressure control device for a construction machine according to an embodiment of the present invention
  • Figure 5 is a pilot pressure control device for a construction machine according to an embodiment of the present invention
  • the discharge flow rate of the hydraulic pump 6 is a flow chart illustrating a pilot pressure control method for a construction machine according to an embodiment of the present invention.
  • the pilot pressure control apparatus for a construction machine includes a variable displacement hydraulic pump (hereinafter, referred to as a hydraulic pump) 10 and a pilot pump 11 as an engine (not shown). And the like).
  • a hydraulic pump hereinafter, referred to as a hydraulic pump
  • a pilot pump 11 as an engine (not shown). And the like).
  • a regulator 12 for adjusting the swash plate tilt angle to control the discharge flow rate of the hydraulic pump 10 is connected to the electromagnetic proportional pressure reducing valve (PPRV) 13.
  • PPRV electromagnetic proportional pressure reducing valve
  • a hydraulic actuator (for example, an arm cylinder) 14 driven by the hydraulic oil of the hydraulic pump 10 to operate a work device such as an arm is connected to the hydraulic pump 10 through a flow path 15. do.
  • Control valve (MCV) 16 (for example, a valve for controlling the flow rate supplied to the arm cylinder from the hydraulic pump 10 for controlling the hydraulic oil supplied to the hydraulic actuator 14 at the time of switching by the application of pilot pressure) Is installed in the flow path 15 between the hydraulic pump 10 and the hydraulic actuator 14.
  • the hydraulic pump 10 supplies a control valve for supplying the hydraulic oil of the hydraulic pump 10 to the boom cylinder or the bucket cylinder when switching by the pilot pressure applied when the operation lever for the boom or the bucket is operated. And the flow path 15 between the hydraulic actuator.
  • An operation lever (RCV) 17 for outputting a pilot pressure corresponding to the operation amount is provided in the flow path between the pilot pump 11 and the control valve 16.
  • a first pressure sensor 19 for sensing is installed in the flow path A, and also flows from the arm-out port (or “second pressure port") of the control valve 16.
  • a second pressure sensor 20 for detecting the pilot residual pressure drained through (B) is installed in the flow path (B).
  • a controller 21 for inputting an electrical signal to the electromagnetic proportional pressure reducing valve (PPRV) 13 for operating the regulator 12;
  • the hydraulic actuator 14 is a hydraulic actuator
  • the hydraulic pump 10 is a hydraulic pump 10 .
  • a positive control method in which the discharge flow rate is controlled in proportion to the pilot pressure applied to the control valve 21 when the operation lever 17 is operated may be applied.
  • a variable displacement hydraulic pump hereinafter referred to as a hydraulic pump 10 and the pilot pump (11);
  • a regulator 12 for adjusting the swash plate tilt angle to control the discharge flow rate of the hydraulic pump 10;
  • a hydraulic actuator 14 driven by the hydraulic oil of the hydraulic pump 10 to operate the working device (for example, referring to an arm cylinder);
  • An operation lever (RCV) 17 for outputting a pilot pressure corresponding to the operation amount;
  • a control valve (MCV) 16 installed in the oil passage 15 of the hydraulic pump 10 and controlling the hydraulic oil supplied to the hydraulic actuator 14 at the time of switching; Pilot pressure applied to the arm-in port (or “first hydraulic pressure port") of the control valve 16 and the control valve 16 when the operation lever 17 is operated.
  • First and second pressure sensors 19 and 20 for detecting pilot residual pressure drained from an arm-out port of the arm (or " second pressure port ");
  • a controller (21) connected to the electromagnetic proportional pressure reducing valve (13) for applying pilot pressure to the first and second pressure sensors (19, 20) and the regulator (12). :
  • the pilot pressure applied to the arm-in port of the control valve 16 by the operation of the operating lever 17 is sensed by the first pressure sensor 19, and the arm-out of the control valve 16 is detected. Sensing the pilot residual pressure (referred to back pressure) drained from the side port by the second pressure sensor (20) (S20);
  • the operating lever 17 is arm-in or arm-out to operate the work device of the excavator (referring to the arm as an example).
  • the pilot pressure according to the operation of the operation lever 17 is applied to the control valve 16.
  • the pilot pressure applied to the arm-in port of the control valve 16 is detected by the first pressure sensor 19, the detection signal is the controller It is input to 21.
  • the pilot residual pressure (referring to back pressure) generated at the arm-out side port of the control valve 16 is sensed by the second pressure sensor 20, and a detection signal is detected. Is input to the controller 21.
  • the magnitude of the pressure value generated in the arm-out side port of the control valve 16 detected by the second pressure sensor 20 is determined.
  • the pressure value detected by the second pressure sensor 20 is greater than "0"
  • the difference between the pilot pressure detected by the first pressure sensor 19 and the pilot residual pressure detected by the second pressure sensor 20 means an absolute value.
  • a control signal is input to the regulator 12 to discharge the flow rate corresponding to the differential pressure between the pilot pressure and the pilot residual pressure detected by the first and second pressure sensors 19 and 20 from the hydraulic pump 10. And proceeds to S60.
  • the flow rate corresponding to the differential pressure of the pilot pressure applied to the arm-in side port of the control valve 16 and the pilot residual pressure drained from the arm-out side port of the control valve 16 is determined by the hydraulic pump 10. Is discharged from.
  • the flow rate corresponding to the actual switching amount of the spool of the control valve 16 (switching the spool corresponding to the differential pressure between the pilot pressure and the pilot residual pressure) can be discharged from the hydraulic pump 10 ( Denoted by the graph curve f of FIG. 5). This limits the amount of switching of the spool of the control valve 16 when the operation lever 17 is operated to prevent excessive pressure rise in the hydraulic pump 10.
  • the pilot pressure by the operation of the operation lever 17 is applied to the control valve 16 to switch the spool in the left or right direction on the drawing, from the hydraulic pump 10 Since the hydraulic oil discharged is supplied to the hydraulic actuator 14 via the control valve 16, the working device of the arm can be operated.

Abstract

Disclosed are a pilot pressure controlling device for construction machinery, and a method for controlling said device, which are for controlling a pilot pressure that is applied to a control valve when an actuating lever is manipulated in order to operate a working device. As a pilot pressure controlling device according to the present invention, provided is a pilot pressure controlling device for construction machinery, which comprises: a regulator for adjusting a swash plate swivel angle in order to control the rate of discharged flow from a hydraulic pump; a hydraulic actuator connected to the hydraulic pump; an actuating lever; a control valve for controlling a working fluid supplied from the hydraulic pump to the hydraulic actuator; a first pressure sensor for sensing a pilot pressure applied to a first water pressure port of the control valve when the actuating lever is manipulated, and a second pressure sensor for sensing a draining pilot residual pressure from a second water pressure port of the control valve; and a controller for inputting a control signal into the regulator in order to discharge from the hydraulic pump a fluid at a flowrate corresponding to the pressure difference between the pilot pressure sensed by the first pressure sensor and the pilot residual pressure sensed by the second pressure sensor.

Description

건설기계용 파일럿압력 제어장치 및 그 제어방법Pilot pressure control device for construction machinery and its control method
본 발명은 파일럿압력 제어장치에 관한 것으로, 보다 구체적으로 설명하면, 아암 등의 작업장치를 동작시키기 위해 조작레버(RCV)를 조작시 컨트롤밸브(MCV)에 인가되는 파일럿압력을 제어하기 위한 건설기계용 파일럿압력 제어장치 및 그 제어방법에 관한 것이다.The present invention relates to a pilot pressure control device, and more specifically, to a construction machine for controlling the pilot pressure applied to the control valve (MCV) when operating the operating lever (RCV) to operate the work device such as the arm And a control method thereof.
굴삭기의 아암 등의 작업장치를 동작시키기 위해 운전석의 좌,우측에 장착되는 작업장치용 조작레버(RCV)를 조작하는 경우, 상기 조작레버의 조작량에 대응되는 파일럿압력이 컨트롤밸브에 입력되어 내부 스풀을 절환시킴에 따라, 유압펌프의 작동유를 아암실린더 등에 공급할 수 있게 된다.When operating a work device control lever (RCV) mounted on the left and right sides of the driver's seat to operate a work device such as an arm of an excavator, a pilot pressure corresponding to the operation amount of the control lever is input to the control valve and the internal spool is operated. By switching, the hydraulic oil of the hydraulic pump can be supplied to the arm cylinder or the like.
한편, 가변용량형 유압펌프의 토출유량을 제어할 경우, 조작레버를 조작시 컨트롤밸브(MCV)에 인가되는 파일럿압력에 비례하여 유압펌프의 토출유량을 제어하는 포지티브 제어방식(positive control system)과, 컨트롤밸브의 하류측에 형성되는 압력에 반비례하여 유압펌프의 토출유량을 제어하는 네가티브 제어방식(negative control system)이 사용된다.On the other hand, in the case of controlling the discharge flow rate of the variable displacement hydraulic pump, a positive control system for controlling the discharge flow rate of the hydraulic pump in proportion to the pilot pressure applied to the control valve (MCV) when operating the operation lever; In addition, a negative control system is used to control the discharge flow rate of the hydraulic pump in inverse proportion to the pressure formed on the downstream side of the control valve.
도 1은 조작레버의 조작에 의한 유압펌프의 압력 및 아암 작업장치의 압력 변화됨을 보여주는 그래프이다.1 is a graph showing that the pressure of the hydraulic pump and the pressure of the arm working device by the operation of the operating lever.
도 1에 도시한 바와 같이, 아암-인(arm-in) 동작시키기 위해 아암구동용 조작레버(RCV)를 조작하는 경우 조작량에 대응되는 파일럿압력(하단의 그래프곡선(a)을 말함)이 아암실린더용 컨트롤밸브의 입구측포트에 입력되고, 이와 동시에 상기 아암실린더용 컨트롤밸브의 출구측포트에 순간적으로 아암-아웃 파일럿압력(하단의 그래프곡선(b)을 말함)에 해당되는 파일럿잔압이 형성된 후 소멸된다.As shown in Fig. 1, when operating the arm drive operation lever RCV for arm-in operation, the pilot pressure corresponding to the operation amount (refer to the lower graph curve a) is the arm. The pilot residual pressure corresponding to the arm-out pilot pressure (referred to graph curve b at the bottom) is instantaneously input to the inlet port of the cylinder control valve and at the same time to the outlet port of the control valve for the arm cylinder. It is destroyed after.
이때, 제1,2유압펌프측 작동유에 순간적으로 임의압력(일 예로서 300K를 말함)을 초과하는 피크압력이 발생된다(상단의 그래프곡선(c)을 말함). 아암실린더의 라지챔버측 압력도 동시에 제1,2유압펌프의 작동유 압력과 동일하게 상기 임의압력을 초과하는 피크압력이 발생된다(중간의 그래프곡선(d)을 말함).At this time, a peak pressure exceeding an arbitrary pressure (say 300K as an example) is instantaneously generated in the hydraulic fluid on the first and second hydraulic pumps (referring to the upper graph curve c). At the same time, the pressure of the large chamber side of the arm cylinder is generated at the same time as the hydraulic oil pressure of the first and second hydraulic pumps.
전술한 바와 같은 포지티브 제어방식의 유압시스템에 있어서, 작업장치를 동작시키기 위해 조작레버를 조작시 조작레버의 가압측에 대응되는 반대측에 파일럿압력의 잔압이 발생될 경우, 컨트롤밸브의 입구측포트에 대응되는 출구측포트에도 상기 잔압에 대응되는 파일럿압력이 발생된다.In the positive control hydraulic system as described above, when a residual pressure of the pilot pressure is generated on the opposite side corresponding to the pressure side of the control lever when the control lever is operated to operate the work device, the inlet port of the control valve is provided. The pilot pressure corresponding to the residual pressure is also generated in the corresponding outlet port.
이로 인해, 상기 컨트롤밸브의 스풀이 절환되는 구간은 조작레버의 조작에 의해 목표로 하는 파일럿압력과 상기 출구측포트에 발생되는 잔압에 대응되는 파일럿압력의 차압만큼 이동된다.Thus, the section in which the spool of the control valve is switched is moved by the differential pressure of the pilot pressure corresponding to the target pilot pressure and the residual pressure generated in the outlet port by the operation of the operation lever.
반면에, 포지티브 제어방식의 유압시스템에서는 유압펌프의 토출유량(Q)은 조작레버의 조작에 의한 파일럿압력(Pi)에 대응되게 토출된다. 이로 인해 상기 컨트롤밸브의 스풀 절환량이 제한된 상태, 즉 스풀의 개구면적이 작은 상태에서 유압펌프의 작동유가 공급될 경우 상기 유압펌프에 과도한 압력이 발생되고, 에너지 손실을 초래하여 장비의 연비를 저하시키는 문제점이 있다.On the other hand, in the positive control hydraulic system, the discharge flow rate Q of the hydraulic pump is discharged corresponding to the pilot pressure Pi by the operation of the operation lever. As a result, when hydraulic fluid is supplied to the hydraulic pump while the spool switching amount of the control valve is limited, that is, when the opening area of the spool is small, excessive pressure is generated in the hydraulic pump, resulting in energy loss, which lowers fuel efficiency of the equipment. There is a problem.
도 2는 종래 기술에 의한 파일럿압력 제어장치의 개략도이고, 도 3은 아암구동용 스풀에 발생되는 파일럿압력을 설명하기 위한 개략도이다.2 is a schematic diagram of a pilot pressure control device according to the prior art, and FIG. 3 is a schematic diagram for explaining pilot pressure generated in the arm driving spool.
도 2 및 도 3에 도시한 바와 같이, 포지티브 제어시스템의 경우, 아암-인(arm-in) 또는 아암-아웃(arm-out) 동작을 위해 아암구동용 조작레버(1)를 조작하게 되면, 상기 조작레버(1)의 조작에 의한 파일럿압력이 셔틀밸브(2)로 입력됨에 따라, 입력되는 파일럿압력중 상대적으로 높은 압력이 상기 셔틀밸브(2)로부터 아암구동용 컨트롤밸브(4)에 입력된다.2 and 3, in the case of the positive control system, when the arm driving operation lever 1 is operated for arm-in or arm-out operation, As the pilot pressure by the operation of the operation lever 1 is input to the shuttle valve 2, a relatively high pressure among the pilot pressures inputted is input from the shuttle valve 2 to the arm driving control valve 4. do.
이때, 상기 컨트롤밸브(4)에 입력되는 파일럿압력을 압력센서(3)에 의해 감지하게 되고, 압력센서(3)에 의해 검출된 파일럿압력에 대응되게 유압펌프의 토출유량을 제어하게 된다.At this time, the pilot pressure input to the control valve 4 is sensed by the pressure sensor 3, and the discharge flow rate of the hydraulic pump is controlled to correspond to the pilot pressure detected by the pressure sensor (3).
이로 인해, 상기 컨트롤밸브(4)의 아암-인 또는 아암-아웃측에 잔압이 발생되는 경우에도 상기 셔틀밸브(2)에 의해 선택된 상대적으로 높은 파일럿압력에 대응되게 유압펌프의 작동유를 토출하게 되므로(도 2에 그래프곡선(e)으로 표기됨), 상기 컨트롤밸브(4)의 잔압에 따른 스풀의 절환과 무관하게 유압펌프의 작동유가 컨트롤밸브(4)에 공급되고 있다.Thus, even when residual pressure is generated on the arm-in or arm-out side of the control valve 4, the hydraulic oil of the hydraulic pump is discharged to correspond to the relatively high pilot pressure selected by the shuttle valve 2. 2, the hydraulic oil of the hydraulic pump is supplied to the control valve 4 irrespective of switching of the spool according to the residual pressure of the control valve 4.
한편, 상기 조작레버(1)를 아암-인(arm-in) 조작하는 경우 조작레버(1)의 조작량에 대응되는 파일럿압력이 상기 컨트롤밸브(4) 스풀의 아암-인 포트에 입력된다. 그러나 조작레버(1)에 누유가 발생되거나 컨트롤밸브(4)에 누유가 발생되면, 상기 컨트롤밸브(4)에 입력되는 아암-아웃(arm-out)측에 배압이 발생하고, 아암-인과 아암-아웃 파일럿압력의 차압만큼만 스풀이 절환된다.On the other hand, in the case of arm-in operation of the operation lever 1, the pilot pressure corresponding to the operation amount of the operation lever 1 is input to the arm-in port of the control valve 4 spool. However, when leakage occurs in the control lever 1 or leakage occurs in the control valve 4, back pressure occurs on the arm-out side input to the control valve 4, and arm-in and arm The spool is switched only by the differential pressure of the out pilot pressure.
이는 아암-아웃 조작하는 경우에도 동일한 현상이다.This is the same phenomenon even in the case of arm-out operation.
이로 인해, 상기 컨트롤밸브(4)의 스풀은 상기 조작레버(1)를 조작한 만큼의 파일럿압력에 대응되게 절환되지않게 되므로, 상기 컨트롤밸브(4)의 스풀 개구면적이 작아 유압펌프에서 동일한 작동유가 공급되는 경우에도 상기 컨트롤밸브(4)에 과다한 압력이 발생하게 되는 문제점이 있다.As a result, the spool of the control valve 4 is not switched corresponding to the pilot pressure as much as the operation lever 1 is operated. Therefore, the spool opening area of the control valve 4 is small so that the same hydraulic fluid is used in the hydraulic pump. There is a problem in that excessive pressure is generated in the control valve 4 even when is supplied.
따라서, 본 발명은 전술한 문제점을 해결하고자 하는 것으로, 조작레버 조작에 의한 파일럿압력을 컨트롤밸브에 인가시킬 경우, 컨트롤밸브의 제1수압포트와 제2수압포트에 발생되는 차압만큼의 유량을 유압펌프로부터 토출시킬 수 있는 건설기계용 파일럿압력 제어장치 및 그 제어방법을 제공하는 것을 목적으로 한다.Accordingly, the present invention is to solve the above-described problems, when applying the pilot pressure by operating the operating lever to the control valve, the hydraulic pressure is applied as much as the differential pressure generated in the first hydraulic pressure port and the second hydraulic pressure port of the control valve An object of the present invention is to provide a pilot pressure control device for a construction machine capable of discharging from a pump and a control method thereof.
상기 및 기타 본 발명의 목적을 달성하기 위하여 본 발명의 일 실시예에 따르면,According to one embodiment of the present invention to achieve the above and other objects of the present invention,
유압펌프;Hydraulic pump;
상기 유압펌프의 토출유량을 제어하기 위해 사판경전각을 조정하는 레귤레이터;A regulator for adjusting the swash plate tilt angle to control the discharge flow rate of the hydraulic pump;
상기 유압펌프의 작동유에 의해 구동되는 유압 액츄에이터;A hydraulic actuator driven by the hydraulic oil of the hydraulic pump;
조작량에 대응되는 파일럿압력을 출력하는 조작레버;An operation lever for outputting a pilot pressure corresponding to the operation amount;
상기 유압펌프의 유로에 설치되고, 절환시 상기 유압 액츄에이터에 공급되는 작동유를 제어하는 컨트롤밸브;A control valve installed in a flow path of the hydraulic pump and controlling hydraulic oil supplied to the hydraulic actuator during switching;
상기 조작레버를 조작시 상기 컨트롤밸브의 제1수압포트에 인가되는 파일럿압력을 감지하는 제1압력센서 및 상기 컨트롤밸브의 제2수압포트로부터 드레인되는 파일럿잔압을 감지하는 제2압력센서;A first pressure sensor for sensing a pilot pressure applied to the first hydraulic pressure port of the control valve and a second pressure sensor for sensing a pilot residual pressure drained from the second hydraulic pressure port of the control valve when the operation lever is operated;
상기 제1압력센서에 의해 검출된 파일럿압력과 상기 제2압력센서에 의해 검출된 파일럿잔압의 차압에 대응되는 유량을 상기 유압펌프로부터 토출시키기 위해 상기 레귤레이터에 제어신호를 입력하는 컨트롤러;를 구비하는 건설기계용 파일럿압력 제어장치를 제공한다.And a controller for inputting a control signal to the regulator to discharge a flow rate corresponding to the differential pressure between the pilot pressure detected by the first pressure sensor and the pilot residual pressure detected by the second pressure sensor from the hydraulic pump. Provides a pilot pressure control device for construction machinery.
상기 및 기타 본 발명의 목적을 달성하기 위하여 본 발명의 일 실시예에 따르면,According to one embodiment of the present invention to achieve the above and other objects of the present invention,
유압펌프; 상기 유압펌프의 토출유량을 제어하기 위해 사판 경전각을 제어하는 레귤레이터; 상기 유압펌프에 연결되는 유압 액츄에이터; 조작레버; 절환시 상기 유압 액츄에이터에 공급되는 작동유를 제어하는 컨트롤밸브; 상기 조작레버를 조작시 상기 컨트롤밸브에 인가되는 파일럿압력 및 드레인되는 파일럿잔압을 감지하는 제1,2압력센서; 상기 제1,2압력센서 및 레귤레이터에 연결되는 컨트롤러;를 구비하는 건설기계용 파일럿압력 제어방법에 있어서:Hydraulic pump; A regulator for controlling the swash plate tilt angle to control the discharge flow rate of the hydraulic pump; A hydraulic actuator connected to the hydraulic pump; Operation lever; A control valve for controlling hydraulic oil supplied to the hydraulic actuator during switching; First and second pressure sensors for sensing a pilot pressure applied to the control valve and a pilot residual pressure drained when the operation lever is operated; In the pilot pressure control method for a construction machine comprising: a controller connected to the first and second pressure sensors and a regulator:
상기 조작레버의 조작유무를 검출하는 단계;Detecting whether the operation lever is operated;
상기 조작레버의 조작에 의해 상기 컨트롤밸브의 제1수압포트에 인가되는 파일럿압력을 상기 제1압력센서에 의해 감지하고, 상기 컨트롤밸브의 제2수압포트로부터 드레인되는 파일럿잔압을 상기 제2압력센서에 의해 감지하는 단계;The pilot pressure applied to the first hydraulic pressure port of the control valve by the operation of the operation lever is sensed by the first pressure sensor, and the pilot residual pressure drained from the second hydraulic pressure port of the control valve is measured by the second pressure sensor. Detecting by;
상기 제2압력센서에 의해 검출된 압력값에 의해 상기 컨트롤밸브의 제2수압포트에 파일럿잔압 발생유무를 판단하는 단계;Determining whether pilot residual pressure is generated in the second hydraulic pressure port of the control valve based on the pressure value detected by the second pressure sensor;
상기 조작레버를 조작시 상기 컨트롤밸브의 제2수압포트에 파일럿잔압이 발생되는 경우, 상기 제1,2압력센서에 의해 검출된 파일럿압력과 파일럿잔압의 차압에 대응되는 유량을 상기 유압펌프로부터 토출시키기 위해 상기 레귤레이터에 제어신호를 입력하는 단계;를 포함하는 것을 특징으로 하는 건설기계용 파일럿압력 제어방법을 제공한다.When pilot residual pressure is generated in the second hydraulic pressure port of the control valve when the operation lever is operated, a flow rate corresponding to the differential pressure between the pilot pressure detected by the first and second pressure sensors and the pilot residual pressure is discharged from the hydraulic pump. And providing a control signal to the regulator to provide a pilot pressure control method for a construction machine.
상기 조작레버를 조작시 상기 컨트롤밸브의 제2수압포트에 파일럿잔압이 발생되지않은 경우, 상기 제1압력센서에 의해 검출된 파일럿압력에 대응되는 유량을 상기 유압펌프로부터 토출시키기 위해 상기 레귤레이터에 제어신호를 입력하는 단계;를 포함하는 것을 특징으로 한다.When no pilot residual pressure is generated in the second hydraulic pressure port of the control valve when the operation lever is operated, the regulator is controlled to discharge the flow rate corresponding to the pilot pressure detected by the first pressure sensor from the hydraulic pump. Inputting a signal; characterized in that it comprises a.
상기 유압 액츄에이터는The hydraulic actuator is
굴삭기의 붐실린더, 아암실린더 및 버킷실린더 중 어느 하나인 것을 특징으로 한다.It is characterized in that any one of the boom cylinder, the arm cylinder and the bucket cylinder of the excavator.
상기 유압펌프는The hydraulic pump is
상기 조작레버를 조작시 상기 컨트롤밸브에 인가되는 파일럿압력에 비례하여 토출유량이 제어되는 포지티브 제어방식이 적용되는 것을 특징으로 한다.The positive control method is characterized in that the discharge flow rate is controlled in proportion to the pilot pressure applied to the control valve when the operation lever is operated.
전술한 구성을 갖는 본 발명에 따르면, 조작레버를 조작시 파일럿압력이 인가되는 컨트롤밸브의 제1수압포트와 제2수압포트에 발생되는 차압에 대응되는 유량을 유압펌프로부터 토출시킴에 따라, 컨트롤밸브의 스풀 제한적인 절환에 의해 컨트롤밸브 및 유압펌프에 과다한 압력 발생을 방지하고, 에너지 손실로 인한 연비 저하를 방지할 수 있는 효과가 있다.According to the present invention having the above-described configuration, as the flow rate corresponding to the differential pressure generated in the first hydraulic pressure port and the second hydraulic pressure port of the control valve to which the pilot pressure is applied when the operation lever is operated, the control is performed. By restricting the spool of the valve, it is possible to prevent excessive pressure from occurring in the control valve and the hydraulic pump, and to prevent fuel consumption from being lost due to energy loss.
도 1은 조작레버의 조작에 의한 유압펌프의 압력 및 아암 작업장치의 압력 변화됨을 보여주는 그래프,1 is a graph showing that the pressure of the hydraulic pump and the pressure of the arm working device by the operation of the operating lever,
도 2는 종래 기술에 의한 파일럿압력 제어장치의 개략도,2 is a schematic view of a pilot pressure control apparatus according to the prior art,
도 3은 아암구동용 스풀에 발생되는 파일럿압력을 설명하기 위한 개략도,Figure 3 is a schematic diagram for explaining the pilot pressure generated in the arm drive spool,
도 4는 본 발명의 일 실시예에 의한 건설기계용 파일럿압력 제어장치를 설명하기 위한 개략도,Figure 4 is a schematic diagram for explaining a pilot pressure control device for a construction machine according to an embodiment of the present invention,
도 5는 본 발명의 일 실시예에 의한 건설기계용 파일럿압력 제어장치에서, 유압펌프의 토출유량 제어를 설명하기 위한 그래프,5 is a graph for explaining the discharge flow rate control of the hydraulic pump in the pilot pressure control apparatus for construction machinery according to an embodiment of the present invention,
도 6은 본 발명의 일 실시예에 의한 건설기계용 파일럿압력 제어방법을 나타내는 흐름도이다.6 is a flow chart showing a pilot pressure control method for a construction machine according to an embodiment of the present invention.
〈도면의 주요 부분에 대한 참조 부호의 설명〉<Explanation of reference numerals for the main parts of the drawings>
10; 유압펌프10; Hydraulic pump
11; 파일럿펌프11; Pilot pump
12; 레귤레이터12; regulator
13; 전자비례감압밸브(PPRV)13; Electronic proportional pressure reducing valve (PPRV)
14; 유압 액츄에이터14; Hydraulic actuator
15; 유로15; Euro
16; 컨트롤밸브(MCV)16; Control Valve (MCV)
17; 조작레버(RCV)17; Operating lever (RCV)
19; 제1압력센서19; 1st pressure sensor
20; 제2압력센서20; Second pressure sensor
21; 컨트롤러21; controller
이하, 첨부도면을 참조하여 본 발명의 바람직한 실시예에 따른 건설기계용 파일럿압력 제어장치 및 그 제어방법을 상세히 설명하기로 한다.Hereinafter, a pilot pressure control apparatus for a construction machine and a control method thereof according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in detail.
도 4는 본 발명의 일 실시예에 의한 건설기계용 파일럿압력 제어장치를 설명하기 위한 개략도이고, 도 5는 본 발명의 일 실시예에 의한 건설기계용 파일럿압력 제어장치에서, 유압펌프의 토출유량 제어를 설명하기 위한 그래프, 도 6은 본 발명의 일 실시예에 의한 건설기계용 파일럿압력 제어방법을 나타내는 흐름도이다.Figure 4 is a schematic diagram for explaining a pilot pressure control device for a construction machine according to an embodiment of the present invention, Figure 5 is a pilot pressure control device for a construction machine according to an embodiment of the present invention, the discharge flow rate of the hydraulic pump 6 is a flow chart illustrating a pilot pressure control method for a construction machine according to an embodiment of the present invention.
도 4를 참조하면, 본 발명의 일 실시예에 따른 건설기계용 파일럿압력 제어장치는, 가변용량형 유압펌프(이하, 유압펌프 라고 칭함)(10) 및 파일럿펌프(11)가 엔진(미도시됨) 등에 연결된다.Referring to FIG. 4, the pilot pressure control apparatus for a construction machine according to an embodiment of the present invention includes a variable displacement hydraulic pump (hereinafter, referred to as a hydraulic pump) 10 and a pilot pump 11 as an engine (not shown). And the like).
상기 유압펌프(10)의 토출유량을 제어하기 위해 사판 경전각을 조정하는 레귤레이터(12)가 전자비례감압밸브(PPRV)(13)에 연결된다.A regulator 12 for adjusting the swash plate tilt angle to control the discharge flow rate of the hydraulic pump 10 is connected to the electromagnetic proportional pressure reducing valve (PPRV) 13.
상기 유압펌프(10)의 작동유에 의해 구동되어 아암 등의 작업장치를 동작시키는 유압 액츄에이터(일 예로서, 아암실린더를 말함)(14)가 유로(15)를 통해 상기 유압펌프(10)에 연결된다.A hydraulic actuator (for example, an arm cylinder) 14 driven by the hydraulic oil of the hydraulic pump 10 to operate a work device such as an arm is connected to the hydraulic pump 10 through a flow path 15. do.
파일럿압력의 인가에 의해 절환시 상기 유압 액츄에이터(14)에 공급되는 작동유를 제어하는 컨트롤밸브(MCV)(16)(일 예로서, 유압펌프(10)로부터 아암실린더에 공급되는 유량을 제어하는 밸브임)가 상기 유압펌프(10)와 유압 액츄에이터(14)사이의 유로(15)에 설치된다.Control valve (MCV) 16 (for example, a valve for controlling the flow rate supplied to the arm cylinder from the hydraulic pump 10 for controlling the hydraulic oil supplied to the hydraulic actuator 14 at the time of switching by the application of pilot pressure) Is installed in the flow path 15 between the hydraulic pump 10 and the hydraulic actuator 14.
도면에는 미 도시되었으나, 붐 또는 버킷용 조작레버 조작시 인가되는 파일럿압력에 의해 절환시, 상기 유압펌프(10)의 작동유를 붐실린더 또는 버킷실린더에 공급하기 위한 컨트롤밸브를 상기 유압펌프(10)와 유압 액츄에이터사이의 상기 유로(15)에 설치할 수 있다.Although not shown in the drawings, the hydraulic pump 10 supplies a control valve for supplying the hydraulic oil of the hydraulic pump 10 to the boom cylinder or the bucket cylinder when switching by the pilot pressure applied when the operation lever for the boom or the bucket is operated. And the flow path 15 between the hydraulic actuator.
조작량에 대응되는 파일럿압력을 출력하는 조작레버(RCV)(17)가 상기 파일럿펌프(11)와 컨트롤밸브(16)사이의 유로에 설치된다.An operation lever (RCV) 17 for outputting a pilot pressure corresponding to the operation amount is provided in the flow path between the pilot pump 11 and the control valve 16.
상기 조작레버(17)를 조작시 상기 컨트롤밸브(16)의 아암-인(arm-in)측 포트(또는, "제1수압포트" 라고 함)에 유로(A)를 통해 인가되는 파일럿압력을 감지하는 제1압력센서(19)가 유로(A)에 설치되고, 또한 상기 컨트롤밸브(16)의 아암-아웃(arm-out)측 포트(또는, "제2수압포트" 라고 함)로부터 유로(B)를 통해 드레인되는 파일럿잔압을 감지하는 제2압력센서(20)가 상기 유로(B)에 설치된다.The pilot pressure applied through the oil passage A to the arm-in port (or "first hydraulic pressure port") of the control valve 16 when operating the operating lever 17 A first pressure sensor 19 for sensing is installed in the flow path A, and also flows from the arm-out port (or "second pressure port") of the control valve 16. A second pressure sensor 20 for detecting the pilot residual pressure drained through (B) is installed in the flow path (B).
상기 제1압력센서(19)에 의해 검출된 파일럿압력과 상기 제2압력센서(20)에 의해 검출된 파일럿잔압(배압을 말함)의 차압에 대응되는 유량을 상기 유압펌프(10)로부터 토출시키기 위해, 상기 레귤레이터(12)를 동작시키는 전자비례감압밸브(PPRV)(13)에 전기적신호를 입력하는 컨트롤러(21);를 구비한다.Discharge the flow rate corresponding to the differential pressure between the pilot pressure detected by the first pressure sensor 19 and the pilot residual pressure (referred to back pressure) detected by the second pressure sensor 20 from the hydraulic pump 10. To this end, a controller 21 for inputting an electrical signal to the electromagnetic proportional pressure reducing valve (PPRV) 13 for operating the regulator 12;
상기 유압 액츄에이터(14)는The hydraulic actuator 14 is
굴삭기의 붐실린더, 아암실린더 및 버킷실린더 중 어느 하나이다.One of the boom cylinder, the arm cylinder and the bucket cylinder of the excavator.
상기 유압펌프(10)는The hydraulic pump 10 is
상기 조작레버(17)를 조작시 상기 컨트롤밸브(21)에 인가되는 파일럿압력에 비례하여 토출유량이 제어되는 포지티브 제어방식이 적용될 수 있다.A positive control method in which the discharge flow rate is controlled in proportion to the pilot pressure applied to the control valve 21 when the operation lever 17 is operated may be applied.
도 4 및 도 6을 참조하면, 본 발명의 일 실시예에 따른 건설기계용 파일럿압력 제어방법은, 가변용량형 유압펌프(이하 유압펌프 라고 칭함)(10) 및 파일럿펌프(11); 상기 유압펌프(10)의 토출유량을 제어하기 위해 사판 경전각을 조정하는 레귤레이터(12); 상기 유압펌프(10)의 작동유에 의해 구동되어 작업장치를 동작시키는 유압 액츄에이터(14)(일 예로서 아암실린더를 말함); 조작량에 대응되게 파일럿압력을 출력하는 조작레버(RCV)(17); 상기 유압펌프(10)의 유로(15)에 설치되고 절환시 상기 유압 액츄에이터(14)에 공급되는 작동유를 제어하는 컨트롤밸브(MCV)(16); 상기 조작레버(17)를 조작시 상기 컨트롤밸브(16)의 아암-인(arm-in)측 포트(또는, "제1수압포트" 라고 함)에 인가되는 파일럿압력 및 상기 컨트롤밸브(16)의 아암-아웃(arm-out)측 포트(또는, "제2수압포트" 라고 함)로부터 드레인되는 파일럿잔압을 감지하는 제1,2압력센서(19,20); 상기 제1,2압력센서(19,20) 및 레귤레이터(12)에 파일럿압력을 인가시키는 전자비례감압밸브(13)에 연결되는 컨트롤러(21);를 구비하는 건설기계용 파일럿압력 제어방법에 있어서:4 and 6, the pilot pressure control method for a construction machine according to an embodiment of the present invention, a variable displacement hydraulic pump (hereinafter referred to as a hydraulic pump) 10 and the pilot pump (11); A regulator 12 for adjusting the swash plate tilt angle to control the discharge flow rate of the hydraulic pump 10; A hydraulic actuator 14 driven by the hydraulic oil of the hydraulic pump 10 to operate the working device (for example, referring to an arm cylinder); An operation lever (RCV) 17 for outputting a pilot pressure corresponding to the operation amount; A control valve (MCV) 16 installed in the oil passage 15 of the hydraulic pump 10 and controlling the hydraulic oil supplied to the hydraulic actuator 14 at the time of switching; Pilot pressure applied to the arm-in port (or "first hydraulic pressure port") of the control valve 16 and the control valve 16 when the operation lever 17 is operated. First and second pressure sensors 19 and 20 for detecting pilot residual pressure drained from an arm-out port of the arm (or " second pressure port "); In the pilot pressure control method for a construction machine comprising: a controller (21) connected to the electromagnetic proportional pressure reducing valve (13) for applying pilot pressure to the first and second pressure sensors (19, 20) and the regulator (12). :
상기 조작레버(17)의 조작유무를 검출하는 단계(S0);Detecting whether or not the operation lever 17 is operated (S0);
상기 조작레버(17)의 조작에 의해 상기 컨트롤밸브(16)의 아암-인측 포트에 인가되는 파일럿압력을 상기 제1압력센서(19)에 의해 감지하고, 상기 컨트롤밸브(16)의 아암-아웃측 포트로부터 드레인되는 파일럿잔압(배압을 말함)을 상기 제2압력센서(20)에 의해 감지하는 단계(S20);The pilot pressure applied to the arm-in port of the control valve 16 by the operation of the operating lever 17 is sensed by the first pressure sensor 19, and the arm-out of the control valve 16 is detected. Sensing the pilot residual pressure (referred to back pressure) drained from the side port by the second pressure sensor (20) (S20);
상기 조작레버(17)를 조작시 상기 제2압력센서(20)에 의해 검출된 압력값에 의해 상기 컨트롤밸브(16)의 아암-아웃측 포트에 파일럿잔압 발생유무를 판단하는 단계(S30);Determining whether pilot residual pressure is generated at an arm-out side port of the control valve 16 based on the pressure value detected by the second pressure sensor 20 when operating the operation lever 17 (S30);
상기 조작레버(17)를 조작시 상기 컨트롤밸브(16)의 아암-아웃측 포트에 파일럿잔압이 발생되는 경우, 상기 제1,2압력센서(19,20)에 의해 검출된 파일럿압력과 파일럿잔압의 차압에 대응되는 유량을 상기 유압펌프(10)로부터 토출시키기 위해 상기 레귤레이터(12)에 파일럿압력을 인가하는 상기 전자비례감압밸브(13)에 전기적신호를 입력하는 단계(S40);When the pilot residual pressure is generated at the arm-out port of the control valve 16 when the operation lever 17 is operated, the pilot pressure and the pilot residual pressure detected by the first and second pressure sensors 19 and 20 are generated. Inputting an electrical signal to the electromagnetic proportional pressure reducing valve (13) for applying a pilot pressure to the regulator (12) to discharge the flow rate corresponding to the differential pressure of the hydraulic pump (10) (S40);
상기 조작레버(17)를 조작시 상기 컨트롤밸브(16)의 아암-아웃측 포트에 파일럿잔압이 발생되지않은 경우, 상기 제1압력센서(19)에 의해 검출된 파일럿압력에 대응되는 유량을 상기 유압펌프(10)로부터 토출시키기 위해 상기 레귤레이터(12)에 파일럿압력을 인가하는 상기 전자비례감압밸브(13)에 전기적신호를 입력하는 단계(S50);를 포함한다.When no pilot residual pressure is generated at the arm-out side port of the control valve 16 when the operation lever 17 is operated, the flow rate corresponding to the pilot pressure detected by the first pressure sensor 19 is measured. And inputting an electrical signal to the electromagnetic proportional pressure reducing valve 13 applying a pilot pressure to the regulator 12 to discharge from the hydraulic pump 10 (S50).
전술한 구성에 따르면, S10에서와 같이, 굴삭기의 작업장치(일 예로서 아암 을 말함)를 동작시키기 위해 상기 조작레버(17)를 아암-인(arm-in) 또는 아암-아웃(arm-out) 상태로 조작하는 경우 상기 조작레버(17)의 조작에 따른 파일럿압력이 상기 컨트롤밸브(16)에 인가된다.According to the above-described configuration, as in S10, the operating lever 17 is arm-in or arm-out to operate the work device of the excavator (referring to the arm as an example). When operating in the) state, the pilot pressure according to the operation of the operation lever 17 is applied to the control valve 16.
S20에서와 같이, 상기 조작레버(17)를 조작시 상기 컨트롤밸브(16)의 아암-인측 포트에 인가되는 파일럿압력을 상기 제1압력센서(19)에 의해 감지하게 되고, 검출신호는 상기 컨트롤러(21)에 입력된다. 이와 동시에 상기 조작레버(17)를 조작시 상기 컨트롤밸브(16)의 아암-아웃측 포트에 발생되는 파일럿잔압(배압을 말함)을 상기 제2압력센서(20)에 의해 감지하게 되고, 검출신호는 상기 컨트롤러(21)에 입력된다.As in S20, when operating the operation lever 17, the pilot pressure applied to the arm-in port of the control valve 16 is detected by the first pressure sensor 19, the detection signal is the controller It is input to 21. At the same time, when the operation lever 17 is operated, the pilot residual pressure (referring to back pressure) generated at the arm-out side port of the control valve 16 is sensed by the second pressure sensor 20, and a detection signal is detected. Is input to the controller 21.
S30에서와 같이, 상기 제2압력센서(20)에 의해 검출된 상기 컨트롤밸브(16)의 아암-아웃측 포트에 발생되는 압력값 크기를 판별한다. 상기 제2압력센서(20)에 의해 검출된 압력값이 "0"보다 큰 경우 상기 조작레버(17)를 조작시 상기 컨트롤밸브(16)의 아암-아웃측 포트에 파일럿잔압이 발생된 것으로 판단하여 S40으로 진행한다.As in S30, the magnitude of the pressure value generated in the arm-out side port of the control valve 16 detected by the second pressure sensor 20 is determined. When the pressure value detected by the second pressure sensor 20 is greater than "0", it is determined that the pilot residual pressure is generated at the arm-out port of the control valve 16 when the operation lever 17 is operated. Proceed to S40.
반면에, 상기 제2압력센서(20)에 의해 검출된 압력값이 "0"보다 작은 경우 상기 조작레버(17)를 조작시 상기 컨트롤밸브(16)의 아암-아웃측 포트에 파일럿잔압이 발생되지않은 것으로 판단하여 S50으로 진행한다.On the other hand, when the pressure value detected by the second pressure sensor 20 is smaller than "0", the pilot residual pressure is generated in the arm-out port of the control valve 16 when the operation lever 17 is operated. If not, proceed to S50.
S40에서와 같이, 상기 조작레버(17)를 조작시 상기 컨트롤밸브(16)의 아암-아웃측 포트에 파일럿잔압이 발생된 경우로써, 상기 조작레버(17)를 조작시 제1압력센서(19)에 의해 검출된 상기 컨트롤밸브(16)의 아암-인 포트에 인가되는 파일럿압력과, 상기 조작레버(17)를 조작시 상기 제2압력센서(20)에 의해 상기 컨트롤밸브(16)의 아암-아웃측 포트에 발생된 파일럿잔압의 차이값을 연산한다.As in S40, when the pilot residual pressure is generated at the arm-out port of the control valve 16 when the operation lever 17 is operated, the first pressure sensor 19 when the operation lever 17 is operated. The pilot pressure applied to the arm-in port of the control valve 16 detected by the control panel 16 and the arm of the control valve 16 by the second pressure sensor 20 when the operation lever 17 is operated. -Compute difference value of pilot residual pressure generated in out port.
이때, 상기 제1압력센서(19)에 의해 검출된 파일럿압력과 상기 제2압력센서(20)에 의해 검출된 파일럿잔압의 차이값은 절대값을 의미한다.At this time, the difference between the pilot pressure detected by the first pressure sensor 19 and the pilot residual pressure detected by the second pressure sensor 20 means an absolute value.
따라서, 상기 제1,2압력센서(19,20)에 의해 검출된 파일럿압력과 파일럿잔압의 차압에 대응되는 유량을 상기 유압펌프(10)로부터 토출시키도록 상기 레귤레이터(12)에 제어신호를 입력하고, S60으로 진행한다.Accordingly, a control signal is input to the regulator 12 to discharge the flow rate corresponding to the differential pressure between the pilot pressure and the pilot residual pressure detected by the first and second pressure sensors 19 and 20 from the hydraulic pump 10. And proceeds to S60.
S50에서와 같이, 상기 조작레버(17)를 조작시 상기 컨트롤밸브(16)의 아암-아웃측 포트에 파일럿잔압이 발생되지않은 경우로써, 상기 제1압력센서(19)에 의해 검출된 파일럿압력에 대응되는 유량을 상기 유압펌프(10)로부터 토출시키기 위해 상기 레귤레이터(12)에 제어신호를 입력하고, S60으로 진행한다.As in S50, when the pilot lever pressure is not generated in the arm-out port of the control valve 16 when the operation lever 17 is operated, the pilot pressure detected by the first pressure sensor 19 is detected. The control signal is input to the regulator 12 to discharge the flow rate corresponding to the hydraulic pump 10, and the flow proceeds to S60.
S60에서와 같이, 상기 컨트롤러(21)로부터 상기 전자비례감압밸브(13)에 전기적신호가 인가됨에 따라 상기 파일럿펌프(11)로부터 공급되는 작동유를 인가된 전기적신호에 대응되게 2차 파일럿압력을 생성하게 된다. 상기 전자비례감압밸브(13)에 의해 생성된 2차 파일럿압력이 레귤레이터(12)에 입력되므로 상기 유압펌프(10)의 사판 경전각을 조정하게 된다.As in S60, as the electrical signal is applied from the controller 21 to the electromagnetic proportional pressure reducing valve 13, the hydraulic oil supplied from the pilot pump 11 generates the second pilot pressure corresponding to the applied electrical signal. Done. Since the secondary pilot pressure generated by the electromagnetic proportional pressure reducing valve 13 is input to the regulator 12, the swash plate tilt angle of the hydraulic pump 10 is adjusted.
따라서, 상기 조작레버(17)의 조작에 의한 파일럿압력을 상기 컨트롤밸브(16)의 아암-인측 포트에 인가시켜 절환시킬 경우, 상기 컨트롤밸브(16)의 아암-아웃측 포트에 파일럿잔압이 발생되는 경우에도, 상기 컨트롤밸브(16)의 아암-인측 포트에 인가되는 파일럿압력과 상기 컨트롤밸브(16)의 아암-아웃측 포트로부터 드레인되는 파일럿잔압의 차압에 대응되는 유량을 유압펌프(10)로부터 토출시키게 된다.Therefore, when the pilot pressure by the operation of the operation lever 17 is applied to the arm-in port of the control valve 16 and switched, a pilot residual pressure is generated in the arm-out port of the control valve 16. In this case, the flow rate corresponding to the differential pressure of the pilot pressure applied to the arm-in side port of the control valve 16 and the pilot residual pressure drained from the arm-out side port of the control valve 16 is determined by the hydraulic pump 10. Is discharged from.
즉, 상기 컨트롤밸브(16)의 스풀의 실제 절환량(상기 스풀을 상기 파일럿압력과 파일럿잔압의 차압에 대응되게 절환시킴)에 대응되는 유량을 상기 유압펌프(10)로부터 토출시킬 수 있게 된다(도 5의 그래프곡선(f)으로 표기됨). 이로 인해 상기 조작레버(17)를 조작시 컨트롤밸브(16)의 스풀의 절환량이 제한되어 상기 유압펌프(10)에 과다한 압력 상승되는 것을 방지할 수 있게 된다.That is, the flow rate corresponding to the actual switching amount of the spool of the control valve 16 (switching the spool corresponding to the differential pressure between the pilot pressure and the pilot residual pressure) can be discharged from the hydraulic pump 10 ( Denoted by the graph curve f of FIG. 5). This limits the amount of switching of the spool of the control valve 16 when the operation lever 17 is operated to prevent excessive pressure rise in the hydraulic pump 10.
S70에서와 같이, 상기 조작레버(17)의 조작에 의한 파일럿압력이 상기 컨트롤밸브(16)에 인가되어 스풀을 도면상, 좌측방향 또는 우측방향으로 절환시킴에 따라, 상기 유압펌프(10)로부터 토출되는 작동유가 상기 컨트롤밸브(16)를 경유하여 상기 유압 액츄에이터(14)에 공급되므로 아암의 작업장치를 동작시킬 수 있게 된다.As in S70, the pilot pressure by the operation of the operation lever 17 is applied to the control valve 16 to switch the spool in the left or right direction on the drawing, from the hydraulic pump 10 Since the hydraulic oil discharged is supplied to the hydraulic actuator 14 via the control valve 16, the working device of the arm can be operated.
여기에서, 상술한 본 발명에서는 바람직한 실시예를 참조하여 설명하였지만, 해당 기술분야에서 숙련된 당업자는 하기의 특허청구범위에 기재된 본 발명의 사상 및 영역으로부터 벗어나지 않는 범위 내에서 본 발명을 다양하게 수정 및 변경할 수 있음을 이해할 수 있을 것이다.Herein, while the present invention has been described with reference to the preferred embodiments, those skilled in the art will variously modify the present invention without departing from the spirit and scope of the invention as set forth in the claims below. And can be changed.
전술한 구성을 갖는 본 발명에 따르면, 굴삭기의 붐 등의 작업장치를 동작시키기 위해 조작레버를 조작시 파일럿압력이 인가되는 컨트롤밸브의 제1수압포트와 제2수압포트에 차압이 발생되는 경우에도 차압에 대응되게 유압펌프의 토출유량을 제어할 수 있는 효과가 있다.According to the present invention having the above-described configuration, even when a differential pressure is generated in the first hydraulic pressure port and the second hydraulic pressure port of the control valve to which the pilot pressure is applied when operating the operation lever to operate a work device such as an boom of an excavator There is an effect that can control the discharge flow rate of the hydraulic pump to correspond to the differential pressure.

Claims (5)

  1. 유압펌프;Hydraulic pump;
    상기 유압펌프의 토출유량을 제어하기 위해 사판경전각을 조정하는 레귤레이터;A regulator for adjusting the swash plate tilt angle to control the discharge flow rate of the hydraulic pump;
    상기 유압펌프의 작동유에 의해 구동되는 유압 액츄에이터;A hydraulic actuator driven by the hydraulic oil of the hydraulic pump;
    조작량에 대응되는 파일럿압력을 출력하는 조작레버;An operation lever for outputting a pilot pressure corresponding to the operation amount;
    상기 유압펌프의 유로에 설치되고, 절환시 상기 유압 액츄에이터에 공급되는 작동유를 제어하는 컨트롤밸브;A control valve installed in a flow path of the hydraulic pump and controlling hydraulic oil supplied to the hydraulic actuator during switching;
    상기 조작레버를 조작시 상기 컨트롤밸브의 제1수압포트에 인가되는 파일럿압력을 감지하는 제1압력센서 및 상기 컨트롤밸브의 제2수압포트로부터 드레인되는 파일럿잔압을 감지하는 제2압력센서;A first pressure sensor for sensing a pilot pressure applied to the first hydraulic pressure port of the control valve and a second pressure sensor for sensing a pilot residual pressure drained from the second hydraulic pressure port of the control valve when the operation lever is operated;
    상기 제1압력센서에 의해 검출된 파일럿압력과 상기 제2압력센서에 의해 검출된 파일럿잔압의 차압에 대응되는 유량을 상기 유압펌프로부터 토출시키기 위해 상기 레귤레이터에 제어신호를 입력하는 컨트롤러;를 구비하는 것을 특징으로 하는 건설기계용 파일럿압력 제어장치.And a controller for inputting a control signal to the regulator to discharge a flow rate corresponding to the differential pressure between the pilot pressure detected by the first pressure sensor and the pilot residual pressure detected by the second pressure sensor from the hydraulic pump. Pilot pressure control device for construction machinery, characterized in that.
  2. 제1항에 있어서,The method of claim 1,
    상기 유압 액츄에이터는The hydraulic actuator is
    굴삭기의 붐실린더, 아암실린더 및 버킷실린더 중 어느 하나인 것을 특징으로 하는 건설기계용 파일럿압력 제어장치.Pilot pressure control device for construction machinery, characterized in that any one of the boom cylinder, the arm cylinder and the bucket cylinder of the excavator.
  3. 제1항에 있어서, 상기 유압펌프는According to claim 1, wherein the hydraulic pump
    상기 조작레버를 조작시 상기 컨트롤밸브에 인가되는 파일럿압력에 비례하여 토출유량이 제어되는 포지티브 제어방식이 적용되는 것을 특징으로 하는 건설기계용 파일럿압력 제어장치.And a positive control method for controlling the discharge flow rate in proportion to the pilot pressure applied to the control valve when the operation lever is operated.
  4. 유압펌프; 상기 유압펌프의 토출유량을 제어하기 위해 사판 경전각을 조정하는 레귤레이터; 상기 유압펌프에 연결되는 유압 액츄에이터; 조작레버; 절환시 상기 유압펌프로부터 유압 액츄에이터에 공급되는 작동유를 제어하는 컨트롤밸브; 상기 조작레버를 조작시 상기 컨트롤밸브에 인가되는 파일럿압력 및 드레인되는 파일럿잔압을 감지하는 제1,2압력센서; 상기 제1,2압력센서 및 레귤레이터에 연결되는 컨트롤러;를 구비하는 건설기계용 파일럿압력 제어방법에 있어서:Hydraulic pump; A regulator for adjusting the swash plate tilt angle to control the discharge flow rate of the hydraulic pump; A hydraulic actuator connected to the hydraulic pump; Operation lever; A control valve for controlling hydraulic oil supplied from the hydraulic pump to the hydraulic actuator during switching; First and second pressure sensors for sensing a pilot pressure applied to the control valve and a pilot residual pressure drained when the operation lever is operated; In the pilot pressure control method for a construction machine comprising: a controller connected to the first and second pressure sensors and a regulator:
    상기 조작레버의 조작유무를 검출하는 단계;Detecting whether the operation lever is operated;
    상기 조작레버의 조작에 의해 상기 컨트롤밸브의 제1수압포트에 인가되는 파일럿압력을 상기 제1압력센서에 의해 감지하고, 상기 컨트롤밸브의 제2수압포트로부터 드레인되는 파일럿잔압을 상기 제2압력센서에 의해 감지하는 단계;The pilot pressure applied to the first hydraulic pressure port of the control valve by the operation of the operation lever is sensed by the first pressure sensor, and the pilot residual pressure drained from the second hydraulic pressure port of the control valve is measured by the second pressure sensor. Detecting by;
    상기 제2압력센서에 의해 검출된 압력값에 의해 상기 컨트롤밸브의 제2수압포트에 파일럿잔압 발생유무를 판단하는 단계;Determining whether pilot residual pressure is generated in the second hydraulic pressure port of the control valve based on the pressure value detected by the second pressure sensor;
    상기 조작레버를 조작시 상기 컨트롤밸브의 제2수압포트에 파일럿잔압이 발생되는 경우, 상기 제1,2압력센서에 의해 검출된 파일럿압력과 파일럿잔압의 차압에 대응되는 유량을 상기 유압펌프로부터 토출시키기 위해 상기 레귤레이터에 제어신호를 입력하는 단계;를 포함하는 것을 특징으로 하는 건설기계용 파일럿압력 제어방법.When pilot residual pressure is generated in the second hydraulic pressure port of the control valve when the operation lever is operated, a flow rate corresponding to the differential pressure between the pilot pressure detected by the first and second pressure sensors and the pilot residual pressure is discharged from the hydraulic pump. Inputting a control signal to the regulator to make a pilot pressure control method for a construction machine.
  5. 제4항에 있어서,The method of claim 4, wherein
    상기 조작레버를 조작시 상기 컨트롤밸브의 제2수압포트에 파일럿잔압이 발생되지않은 경우, 상기 제1압력센서에 의해 검출된 파일럿압력에 대응되는 유량을 상기 유압펌프로부터 토출시키기 위해 상기 레귤레이터에 제어신호를 입력하는 단계;를 포함하는 것을 특징으로 하는 건설기계용 파일럿압력 제어방법.When no pilot residual pressure is generated in the second hydraulic pressure port of the control valve when the operation lever is operated, the regulator is controlled to discharge the flow rate corresponding to the pilot pressure detected by the first pressure sensor from the hydraulic pump. Inputting a signal; Pilot pressure control method for a construction machine comprising a.
PCT/KR2014/011358 2014-11-25 2014-11-25 Pilot pressure controlling device for construction machinery, and method of controlling same WO2016084992A1 (en)

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Publication number Priority date Publication date Assignee Title
CN107201761A (en) * 2017-06-05 2017-09-26 柳州柳工挖掘机有限公司 Excavate Electrical Control positive flow control method

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JP3081988B2 (en) * 1996-04-08 2000-08-28 株式会社小松製作所 Control device for hydraulic drive machine
KR100651695B1 (en) * 2002-05-08 2006-11-30 현대중공업 주식회사 control system and method for construction equipment
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JP4851857B2 (en) * 2006-06-15 2012-01-11 東芝機械株式会社 Method and apparatus for controlling pump flow rate
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JP3081988B2 (en) * 1996-04-08 2000-08-28 株式会社小松製作所 Control device for hydraulic drive machine
KR100651695B1 (en) * 2002-05-08 2006-11-30 현대중공업 주식회사 control system and method for construction equipment
JP4851857B2 (en) * 2006-06-15 2012-01-11 東芝機械株式会社 Method and apparatus for controlling pump flow rate
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Publication number Priority date Publication date Assignee Title
CN107201761A (en) * 2017-06-05 2017-09-26 柳州柳工挖掘机有限公司 Excavate Electrical Control positive flow control method

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