WO2013100511A1 - 건설기계의 유압시스템 - Google Patents
건설기계의 유압시스템 Download PDFInfo
- Publication number
- WO2013100511A1 WO2013100511A1 PCT/KR2012/011356 KR2012011356W WO2013100511A1 WO 2013100511 A1 WO2013100511 A1 WO 2013100511A1 KR 2012011356 W KR2012011356 W KR 2012011356W WO 2013100511 A1 WO2013100511 A1 WO 2013100511A1
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- WIPO (PCT)
- Prior art keywords
- pressure
- pump
- hydraulic
- flow rate
- control signal
- Prior art date
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Classifications
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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
- E02F9/2292—Systems with two or more pumps
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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
- 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
- F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20576—Systems with pumps with multiple pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50554—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure downstream of the pressure control means, e.g. pressure reducing valve
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/633—Electronic controllers using input signals representing a state of the prime mover, e.g. torque or rotational speed
-
- 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
- F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
- F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
Definitions
- the present invention relates to a hydraulic system of a construction machine, and more particularly, in a hydraulic system of a construction machine equipped with a mechanical hydraulic pump, a construction to reduce excessive fuel consumption and improve fuel efficiency and operability when the operator sharply operates the joystick.
- a hydraulic system of a machine A hydraulic system of a machine.
- the hydraulic system discharges hydraulic oil from the hydraulic pump, and the hydraulic oil is waiting at the inlet of the main control valve.
- a plurality of spools are provided inside the main control valve, and a plurality of actuators are connected to the outside.
- a pilot pressure which is a flow control signal, is generated in a flow request unit such as a joystick or a pedal, and the pilot pressure is provided to the main control valve.
- the main control valve opens and closes a specific spool by pilot pressure, and the operating oil is provided to an actuator associated with the spool by opening and closing the spool.
- the hydraulic fluid discharged from the hydraulic pump by operating the joystick is provided to the actuator via the main control valve, thereby operating the actuator.
- the hydraulic pump receives power from the engine, the engine generates power by burning fuel.
- FIG. 1 is a view for explaining a hydraulic system for construction machinery.
- the mechanical hydraulic pump 10 is provided with a swash plate r, and the discharge flow rate is increased or decreased according to the inclination angle of the swash plate.
- the inclination angle of the swash plate is adjusted by the pump regulator 40.
- the hydraulic oil discharged from the hydraulic pump 10 is provided to the main control valve 20, and when a specific spool is operated in the main control valve 20, the hydraulic oil described above is applied to the actuator 30 associated with the corresponding spool. Is provided.
- the actuator 30 provided with the hydraulic oil operates to perform a desired work.
- the flow control signal is to move a specific spool in the main control valve 20 along the flow control signal line pi.
- the flow control signal is opened and closed by operating the spool of the main control valve 20, and when the spool is opened, the hydraulic oil is provided to the actuator 30 to perform a desired operation.
- the hydraulic pump 10 receives power from the engine 100, the engine 100 is to be controlled by the control of the engine control device 104.
- the engine 100 may set the engine speed (rpm) in advance in the engine speed control unit 102, the engine speed (rpm) may be varied by the command of the pump control device 50.
- the engine control device 104 When the command of the engine speed (rpm) is input to the engine control device 104, the engine control device 104 operates the engine governor 106 to provide fuel to the engine 100. For example, when a command is issued to increase the engine speed, the fuel injection amount is increased. When a command is issued to reduce the engine speed, the fuel injection amount is reduced. Keep constant
- the hydraulic pump 10 is further provided with a gear pump 70 as an auxiliary pump.
- the gear pump 70 supplies a pilot hydraulic fluid to a joystick / pedal and the like, and generates a flow control signal when operating the joystick / pedal to transmit the pressure of the flow control signal.
- the pilot hydraulic oil discharged from the gear pump 70 is connected to the first hydraulic line (L1) to the shuttle valve 80 via the electromagnetic proportional pressure reducing valve (60).
- the other side of the shuttle valve 80 receives a flow control signal pi.
- the shuttle valve 80 selects a large pressure between the pressure of the first hydraulic line L1 and the pressure of the flow control signal line and provides the pump regulator 40 via the second hydraulic line L2.
- the above-described electromagnetic proportional pressure reducing valve 60 receives a control signal from the above-described pump control device 50 through the first signal line s1.
- the flow rate set for the pilot pressure and the optional operation of the flow control signal line (pi) using the electronic proportional pressure reducing valve 60 Compared to the corresponding pressure, a higher pressure is output to control the flow rate.
- FIG. 2 is a view for explaining the control of the mechanical hydraulic pump in the hydraulic system of the construction machine.
- the control of the mechanical hydraulic pump 10 is a flow control, back horsepower control, horsepower control and will be described in detail for each control.
- the flow rate control generates a required flow rate by operating the joystick, and a flow rate control signal pi is generated by the displacement of the joystick.
- a flow rate control signal pi is generated by the displacement of the joystick.
- the pump regulator 40 adjusts the swash plate r so that the flow rate Qp from q1 to q2. It is to control to increase. As a result, the discharge flow rate of the hydraulic pump 10 is increased.
- the back horsepower control is to control to maintain a constant pump horsepower set under the load pressure Pd.
- the correlation between the pressure and the flow rate is set to the PQ map, and the load pressure Pd applied to the hydraulic line between the hydraulic pump 10 and the main control valve 20 is received and discharged according to the set PQ map. To vary the flow rate.
- the pump regulator 40 adjusts the swash plate r so that the flow rate Qp decreases from q1 to q2. Control as much as possible. This is controlled to reduce the discharge flow rate of the hydraulic pump 10, but the pump horsepower is kept constant.
- Horsepower control is a control to adjust the pump horsepower according to the load of the engine.
- a plurality of P-Q maps are set for back horsepower, and the hydraulic pump is controlled by selecting from a plurality of P-Q maps according to the load.
- the plurality of P-Q maps are commanded from the pump control device 50 via the second signal line s2.
- the PQ map can be provided as a heavy load map, a standard load map, and a light load map, and a specific PQ map is selected to control the hydraulic pump according to the workload. It is.
- the horsepower control selects the PQ map closer to the heavy load when it is determined that the load of the work target is large, and selects the standard load map when it is determined that the load of the work target is general. If it is determined that the PQ map near the light load is selected to control the hydraulic pump 10.
- Figure 3 is a view for explaining the flow rate change in the horsepower control in the hydraulic system of a conventional construction machine.
- 4 is a view for explaining the pump discharge flow rate change, the engine speed change and the engine output change by the joystick operation in the conventional hydraulic system of construction machinery.
- the flow rate Qp increases rapidly compared to the change in the pump load pressure Pd.
- the flow rate is raised to the maximum flow rate q2, and then the flow rate is controlled to decrease by the horsepower control to discharge the reduced flow rate Qp. After that, it is stable from the stabilization time (t2) while maintaining a high pump load pressure (Pd).
- the delta flow rate (delta) until immediately before the maximum flow rate immediately after the joystick operation time point t1, as shown by the change in the pump discharge flow rate. It discharges Qp) and stabilizes after a predetermined time elapses by the control of equal horsepower.
- the excessive hydraulic fluid discharged until the hydraulic pump stabilizes at the peak indicated by the delta Qp due to the sudden increase in the flow rate causes the hydraulic system to be unstable, such as generating a hydraulic shock. There is a problem.
- the rotational speed (rpm) of the engine 100 is increased because more power is required in the hydraulic pump 10.
- the desired engine speed (rpm) cannot be realized immediately. The reason is that an engine covering section is needed until the engine speed is increased.
- there is a turbocharger time rack section in the engine covering section because it takes a certain time until the turbocharger is rotated from low speed to high speed. Therefore, if the required flow rate suddenly increases, the engine speed (rpm) increases within the range allowed by the engine output and is delayed until the turbocharger operates normally. rpm) is increased.
- the control unit detects that the engine rotation speed is slowed by the hydraulic load and the engine rotation speed is slowed by the hydraulic load during initial operation so that the engine rotation speed does not fall. Reduces pump load through horsepower control (pump powershift control).
- horsepower control has no method of reducing the flow rate control to determine the flow rate discharged by the joystick lever or the driving lever, there is a problem that the engine speed (rpm) drops when operated in the initial operation or sudden operation.
- the technical problem to be achieved by the present invention is to prevent the hydraulic shock by controlling the increase in the discharge flow rate discharged from the hydraulic pump gently even in the hydraulic system of a construction machine applying a mechanical hydraulic pump, even if the required flow rate suddenly increases
- the purpose is to provide a hydraulic system of construction machinery that can be.
- Another object of the present invention is to provide a hydraulic system for a construction machine, which uses a mechanical hydraulic pump, to prevent a sudden drop in engine speed when the required flow rate increases suddenly.
- the purpose is to provide.
- the hydraulic system of the construction machine according to the present invention for achieving the above technical problem is a flow control electronic proportional pressure reducing valve (EPPRV) 60 is set to a minimum flow rate control current value;
- a pump control device 50 for controlling the electromagnetic proportional pressure reducing valve 60 to reduce the pressure from a maximum pressure to a set slope when the flow rate control signal is generated.
- the flow control signal pressure of the hydraulic system of the construction machine according to the invention is input in plurality by the first and second flow control signal lines (pi-1, pi-2), the shuttle valve 80, The first shuttle valve 81 and the second flow control signal line (1) for comparing the first pressure of the first flow control signal line (pi-1) with the first pilot pressure and outputting a large pressure to the third pilot hydraulic fluid ( It is provided with the 2nd shuttle valve 82 which compares the 2nd pressure of pi-2 and the said 1st pilot pressure, and outputs a large pressure to a 4th pilot hydraulic fluid,
- the said hydraulic pump 10 is the said 3rd pilot It may include a first hydraulic pump 11 whose swash plate angle is controlled by pressure and a second hydraulic pump 12 whose swash plate angle is controlled by the fourth pilot hydraulic fluid.
- the pump control device 50 of the hydraulic system of the construction machine according to the present invention may be controlled so that the control current value is inputted to the maximum pressure, and returned to the minimum flow rate setting if the flow control signal does not occur.
- the hydraulic system of the construction machine according to the present invention in the hydraulic system of the construction machine to which the mechanical hydraulic pump is applied, by the pump input horsepower is gradually increased to prevent the rapid increase in the load on the engine engine speed Sudden reduction can be prevented, and further, fuel economy can be improved.
- FIG. 1 is a view for explaining a hydraulic system for construction machinery.
- FIG. 2 is a view for explaining the control of the mechanical hydraulic pump in the hydraulic system of the construction machine.
- FIG 3 is a view for explaining the flow rate change in the horsepower control in the hydraulic system of a conventional construction machine.
- FIG. 4 is a view for explaining the pump discharge flow rate change, the engine speed change and the engine output change by the joystick operation in the conventional hydraulic system of construction machinery.
- FIG. 5 is a view for explaining a hydraulic system of a construction machine according to an embodiment of the present invention.
- FIG. 6 is a view for explaining the flow rate change by the flow rate control and horsepower control in the hydraulic system of the construction machine according to an embodiment of the present invention.
- FIG. 7 is a view for explaining the pump discharge flow rate change by the joystick operation in the hydraulic system of the construction machine according to an embodiment of the present invention.
- FIG. 8 is a view for explaining the pump input horsepower change by the joystick operation in the hydraulic system of the construction machine according to an embodiment of the present invention.
- FIG. 9 is a view for explaining the change in the pump regulator control pressure of the discharge hydraulic pressure by the joystick operation in the hydraulic system of the construction machine according to an embodiment of the present invention.
- FIG. 10 is a view for explaining the engine speed change and the engine output change by the joystick operation in the hydraulic system of the construction machine according to an embodiment of the present invention.
- EPPR electromagnetic proportional pressure reducing valve
- pi-1, pi-2 first and second flow control signal lines
- r swash plate r1, r2: 1st, 2nd swash plate
- FIG. 5 is a view for explaining a hydraulic system of a construction machine according to an embodiment of the present invention.
- the hydraulic pump 10 is provided with a first hydraulic pump 11 and a second hydraulic pump 12.
- the first and second hydraulic pumps 11 and 12 become first and second swash plates r1 and r2, respectively.
- a plurality of spools are provided inside the main control valve 20. More specifically, there is a first spool group in charge of the first hydraulic pump 11 and a second spool group in charge of the second hydraulic pump 12.
- the first spool group includes an arm1 spool, a boom2 spool, a swing spool, an option spool, and a travel R spool.
- the second spool group includes an arm 2 spool, a boom 1 spool, a bucket spool, and a left L motor spool.
- pilot pressure is formed to operate a specific spool among the plurality of spools described above by manipulating the joystick in the left and right directions and the front and rear directions, respectively.
- the plurality of pilot pressures are provided to the main control valve 20 via the first and second flow control signal lines pi-1 and pi-2, respectively.
- the gear pump 70 is provided on one of the first, second hydraulic pump (11, 12).
- the pilot hydraulic oil discharged from the gear pump 70 is provided with a first hydraulic line L1 to be connected to the first shuttle valve 81 via the electromagnetic proportional pressure reducing valve 60.
- the other side of the first shuttle valve 81 is connected to the first flow control signal pi-1 to receive the first pressure.
- the first shuttle valve 81 selects a larger pressure between the first pilot hydraulic oil pressure of the first hydraulic line L1 and the first pressure of the first flow control signal, and passes the pump regulator via the second hydraulic line L2.
- the pump regulator 40 controls the swash plate angle of the first hydraulic pump 11.
- the second shuttle valve 82 selects a large pressure between the first pilot oil pressure of the first and fourth hydraulic lines L1 and L4 and the second pressure of the second flow control signal, and the fifth hydraulic pressure. It is provided to the pump regulator 40a via the line L5.
- the pump regulator 40a controls the swash plate angle of the second hydraulic pump 12.
- the pilot hydraulic oil discharged from the gear pump 70 becomes the first pilot hydraulic oil via the electromagnetic proportional pressure reducing valve 60
- the fourth hydraulic line (L4) is connected to the second shuttle valve (82).
- the other side of the second shuttle valve 82 is connected to the second flow control signal line pi-2 to receive the second pressure.
- the first hydraulic line (L1) and the fourth hydraulic line (L4) is connected to provide a bi-directional flow of the pilot hydraulic fluid.
- the second shuttle valve 82 selects a larger pressure between the pressure of the first pilot hydraulic oil of the fourth hydraulic line L4 and the second pressure of the second flow control signal line pi-2, and the second hydraulic line ( The swash plate of the second hydraulic pump 12 is controlled via L2).
- the pilot hydraulic fluid discharged from the gear pump 70 is provided to the first and second shuttle valves 81 and 82 in the state where the electromagnetic proportional pressure reducing valve 60 is opened, so that the first and second hydraulic pumps 11, 10) to control the swash plate angle.
- control current value of the electromagnetic proportional pressure reducing valve 60 (EPPRV) for flow control described above is set so that the maximum pressure is input, and is set and maintained at the minimum flow rate.
- the hydraulic system since there is no joystick input in the idle state in which the work device of the construction machine does not move, the pressure of the foot relief valve is inputted with the maximum pressure.
- the above-described electromagnetic proportional pressure reducing valve 60 is used for controlling the optional flow rate in a general situation, and when the option operation is not performed, the flow rate control signal does not occur, so that the electromagnetic proportional pressure reducing valve 60 may be used for the control of the working flow rate. That is, the electromagnetic proportional pressure reducing valve 60 described in the present invention can be used when the flow rate control for the first and second hydraulic pumps 11 and 12 is performed by operating the joystick.
- the current of the electromagnetic proportional pressure reducing valve 60 is set to a pressure corresponding to the pressure of the flow control signals Pi, pi-1, and pi-2.
- the actuator 30 operates, the inclination of the electromagnetic proportional pressure reducing valve 60 is appropriately adjusted relative to the pressure of the rapidly decreasing flow control signals Pi, pi-1, and pi-2, so that the engine rotational speed is increased. You can prevent it from falling.
- FIG. 6 is a view for explaining the flow rate change by the flow rate control and horsepower control in the hydraulic system of the construction machine according to an embodiment of the present invention.
- the comparative example discharges the excess flow rate due to the responsiveness of the pump regulators 40 and 40a until the pump flow rate reaches stabilization by the constant horsepower control.
- the flow rate rapidly increases (q1-> q2) from the time point at which the joystick was operated by the flow control (Pi point) to the time point at which the joystick operation was completed (Pi end point).
- the horsepower control then reacts with a time difference due to the responsiveness, thereby reducing the flow rate q3 to maintain the pump load at the later increased pump load pressure end point (Pd end point).
- the conventional comparative example is unable to control the excessive flow discharge generated when the joystick is operated abruptly, and the pump load horsepower increases due to the increase in the excessive flow rate, so that the engine load increases and accordingly the target engine Due to the control of the target rpm, the pump horsepower control enters and lowers the pump flow rate, resulting in deterioration of the equipment performance.
- the pilot hydraulic oil flowing from the gear pump 70 to operate the pump regulator 40, 40a quickly to increase the pump load quickly, thereby the horsepower control to initially increase the flow rate It is possible to implement a smooth increase in the flow rate by preventing the discharge.
- the pressure of the flow control signal increases rapidly from the point at which the joystick is operated (Pi point) to the end of the joystick operation (Pi end point), and the electronic proportional pressure reducing valve 60 for flow control is opened.
- the hydraulic system according to the present invention can adjust the pump horsepower increase rate due to excessive flow discharge, and prevents the performance of the equipment from deteriorating by controlling the pump horsepower control according to the engine load which is a problem in the conventional hydraulic system. It is advantageous for equipment operation.
- Figure 7 is a view for explaining the pump discharge flow rate change by the joystick operation in the hydraulic system of the construction machine according to an embodiment of the present invention.
- the comparative example rapidly increases the flow rate immediately after the time t1 of the joystick operation, and after excessively discharging the delta flow rate (delta Qp), a predetermined time has elapsed. It stabilizes from stabilization time t2.
- FIG. 8 is a view for explaining the pump input horsepower change by the joystick operation in the hydraulic system of the construction machine according to an embodiment of the present invention.
- the comparative example when operating the joystick rapidly, the comparative example rapidly increases the pump input horsepower immediately after the time t1 of operating the joystick to form a peak, and thereafter, decreases the pump input horsepower. Is stabilized from the stabilization time t2 after a predetermined time has elapsed.
- FIG. 9 is a view for explaining the change in the pump regulator control pressure of the discharge hydraulic pressure by the joystick operation in the hydraulic system of the construction machine according to an embodiment of the present invention.
- the pump regulator control pressure is a pressure applied to the first and fifth hydraulic lines L1 and L5, and the first and second swash plates r1 and r2 of the first and second hydraulic pumps. It is the pressure to control substantially.
- the comparative example suddenly lowers the pump regulator control pressure immediately after the time point t1 of the joystick operation. Thereafter, after a predetermined time has elapsed, it is stabilized from the stabilization time t2.
- the pump input horsepower is gently lowered to the set slope by reducing the pressure from the maximum pressure to a constant slope by the electronic proportional pressure reducing valve 60 as described above. It is controlled back.
- FIG. 10 is a view for explaining the engine speed change and engine output change by the joystick operation in the hydraulic system of the construction machine according to an embodiment of the present invention.
- the engine speed (rpm) increases when the required flow rate increases or high horsepower is required. However, a predetermined time is required for the engine speed (rpm) to rise to the target engine speed to achieve the desired engine output.
- an engine covering section is necessary to increase the engine speed, and the engine covering section includes time for the turbocharger to perform a normal function. If the turbocharger does not function properly, high engine speeds cannot be expected.
- the comparative example shows the change in the engine speed in the conventional hydraulic system, and the pump speed rapidly increases immediately after the joystick is sharply operated, and the engine speed is drastically lowered. (See comparative example delta rpm)
- the engine speed gradually stabilizes when the desired speed reaches the desired speed.
- the pump horsepower control according to the engine load is minimized to prevent the performance of the equipment is reduced, which is advantageous for the equipment operation of construction machinery.
- the engine speed reaches the desired target speed during the elapse of the engine covering section, and the engine speed decreases more quickly to the desired target speed. Reach and stabilize.
- the hydraulic system of the construction machine according to the present invention in the hydraulic system of the construction machine to which the mechanical hydraulic pump is applied, by the pump input horsepower is gradually increased to prevent the rapid increase in the load on the engine engine speed Sudden reduction can be prevented, and further, fuel economy can be improved.
- the hydraulic system of a construction machine according to the present invention can be used to reduce fuel consumption and improve operability when a joystick is rapidly operated in a hydraulic system equipped with a mechanical hydraulic pump.
Abstract
Description
Claims (3)
- 제어 전류 값이 최대 압력이 입력되고, 최소 유량으로 설정된 유량제어용 전자비례감압밸브(60: EPPRV);상기 전자비례감압밸브(60)에 파일럿 작동유을 제공하는 기어펌프(70);상기 전자비례감압밸브(60)를 경유한 제1 파일럿 작동유의 압력과 유량제어 신호 압력을 비교하여 큰 압력의 제2 파일럿 작동유를 출력하는 셔틀밸브(80);상기 제2 파일럿 작동유에 의해 사판 각도가 제어되는 유압펌프(10); 및상기 유량제어 신호가 발생하면 상기 전자비례감압밸브(60)를 최대 압력부터 설정된 기울기로 압력을 줄이도록 제어하는 펌프제어장치(50);를 포함하는 건설기계의 유압시스템.
- 제 1항에 있어서,상기 유량제어 신호 압력은 제1, 제2 유량제어 신호라인(pi-1, pi-2)에 의해 복수로 입력되고,상기 셔틀 밸브(80)는, 상기 제1 유량제어 신호라인(pi-1)의 제1 압력과 상기 제1 파일럿 압력을 비교하여 큰 압력을 제3 파일럿 작동유로 출력하는 제1 셔틀밸브(81)와 상기 제2 유량제어 신호라인(pi-2)의 제2 압력과 상기 제1 파일럿 압력을 비교하여 큰 압력을 제4 파일럿 작동유로 출력하는 제2 셔틀밸브(82)로 구비되며,상기 유압펌프(10)는, 상기 제3 파일럿 압력에 의해 사판각도가 제어되는 제1 유압펌프(11)와 상기 제4 파일럿 작동유에 의해 사판각도가 제어되는 제2 유압펌프(12)를 포함하는 것을 특징으로 하는 건설기계의 유압시스템.
- 제 1항에 있어서,상기 펌프제어장치(50)는 상기 유량제어 신호가 발생하지 않으면 제어 전류 값이 최대 압력이 입력되고, 최소 유량 설정으로 복귀되도록 제어되는 것을 특징으로 하는 건설기계의 유압시스템.
Priority Applications (2)
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US14/360,504 US9546468B2 (en) | 2011-12-27 | 2012-12-24 | Hydraulic system of construction machine |
CN201280064522.7A CN104011404B (zh) | 2011-12-27 | 2012-12-24 | 工程机械的液压系统 |
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KR20110143066 | 2011-12-27 | ||
KR10-2011-0143066 | 2011-12-27 | ||
KR1020120148200A KR101975062B1 (ko) | 2011-12-27 | 2012-12-18 | 건설기계의 유압시스템 |
KR10-2012-0148200 | 2012-12-18 |
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JP2005060970A (ja) * | 2003-08-08 | 2005-03-10 | Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd | 油圧ショベルの油圧回路 |
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JP2005060970A (ja) * | 2003-08-08 | 2005-03-10 | Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd | 油圧ショベルの油圧回路 |
JP2008196565A (ja) * | 2007-02-09 | 2008-08-28 | Hitachi Constr Mach Co Ltd | 建設機械用3ポンプシステムのトルク制御装置 |
JP2009249875A (ja) * | 2008-04-03 | 2009-10-29 | Yanmar Co Ltd | 作業機械 |
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