WO2023234643A1 - Système de conversion d'énergie de réduction de charge parasite pour engin de chantier - Google Patents

Système de conversion d'énergie de réduction de charge parasite pour engin de chantier Download PDF

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Publication number
WO2023234643A1
WO2023234643A1 PCT/KR2023/007221 KR2023007221W WO2023234643A1 WO 2023234643 A1 WO2023234643 A1 WO 2023234643A1 KR 2023007221 W KR2023007221 W KR 2023007221W WO 2023234643 A1 WO2023234643 A1 WO 2023234643A1
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WIPO (PCT)
Prior art keywords
oil
hydraulic motor
variable hydraulic
pressure
line
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Application number
PCT/KR2023/007221
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English (en)
Korean (ko)
Inventor
정태랑
Original Assignee
레디로버스트머신 주식회사
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Priority claimed from KR1020230067004A external-priority patent/KR20230167711A/ko
Application filed by 레디로버스트머신 주식회사 filed Critical 레디로버스트머신 주식회사
Publication of WO2023234643A1 publication Critical patent/WO2023234643A1/fr

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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
    • 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
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/047—Preventing foaming, churning or cavitation
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/14—Energy-recuperation means

Definitions

  • the present invention relates to a parasitic load reduction type energy conversion system for construction machinery, and more specifically, to a parasitic load reduction type for construction machinery that can reduce the occurrence of parasitic load on the engine in a state where recovery energy of the construction machinery is not generated. It is about energy conversion systems.
  • Excavators and excavators are construction machines generally used for digging or cutting the ground, and are widely used at construction sites and various industrial sites.
  • This excavator includes a boom whose end can be moved along a curved trajectory, and various tools including a bucket can be mounted on the end of the boom.
  • a hydraulic cylinder is connected to the boom, and the hydraulic cylinder drives the boom while lifting and lowering. Hydraulic cylinders are raised and lowered through oil flow in the hydraulic system.
  • An excavator includes power means such as an engine. The engine provides the fluidity of oil flow in the hydraulic system and can simultaneously provide power for the movement of the excavator.
  • the energy recovery system installed in various construction machines recovers boom energy generated when the boom is lowered through a mechanical energy conversion unit.
  • the mechanical energy conversion unit does not recover boom energy through the cylinder, a parasitic load may be generated in the engine.
  • Patent Document 1 Republic of Korea Patent Publication No. 10-0165839
  • the present invention is a construction machine that recovers and utilizes energy generated when the boom is down, and the parasitic load generated in the engine in a state where the recovered energy of the construction machine is not generated.
  • the purpose is to provide a parasitic load reduction type energy conversion system for construction equipment that can reduce engine energy loss and prevent cavitation of the motor when no load is present.
  • the parasitic load reduction type energy conversion system for construction equipment includes a cylinder in which a rod is raised and lowered by the flow of oil, and a main unit connected to the cylinder and selectively controlling the flow of oil provided to the cylinder.
  • An engine that is connected to the control valve and the main control valve and provides oil to the cylinder, a boom that drives up/down by moving the cylinder up/down due to the oil flow, and oil generated when the boom goes up/down.
  • the variable hydraulic pressure is connected to the shaft of the engine and provides rotational force to the shaft.
  • motor A fourth line connecting the variable hydraulic motor and the accumulator;
  • a ninth line connecting the variable hydraulic motor and the oil tank; and a pressure sensor unit installed on the variable hydraulic motor to detect oil pressure. It is characterized by including.
  • the pressure sensor unit may include a first pressure sensor installed at the oil input end of the variable hydraulic motor through which oil flows in, and a second pressure sensor installed at the oil output end of the variable hydraulic motor through which oil is discharged. there is.
  • the first pressure sensor may measure the pressure at the input end of the variable hydraulic motor and detect the flow rate of oil flowing from the accumulator to the variable hydraulic motor.
  • control unit may variably control the amount of oil discharged from the variable hydraulic motor to reduce the parasitic load of the engine.
  • the second pressure sensor may measure the pressure at the output end of the variable hydraulic motor and detect the flow rate of oil discharged from the variable hydraulic motor to the oil tank.
  • a first solenoid valve for controlling the flow rate of oil may be disposed in the ninth line.
  • control unit variably controls the amount of oil discharged from the variable hydraulic motor to the oil tank through the 9th line when the pressure according to the oil flow rate is less than the preset pressure range through the second pressure sensor.
  • the control unit when the pressure according to the oil flow rate exceeds the preset pressure range through the second pressure sensor, the control unit measures the amount of oil discharged from the variable hydraulic motor to the oil tank through the 9th line.
  • the load pressure within the variable hydraulic motor can be reduced by controlling the first solenoid valve to be variably controlled.
  • control unit may control the flow rate of oil discharged from the variable hydraulic motor by receiving the oil pressure measured through the pressure sensor unit.
  • the parasitic load reduction type energy conversion system for construction machinery can reduce the parasitic load generated in the engine in a state where recovery energy of the construction machinery is not generated and prevent energy loss in the engine. In addition, it can prevent engine cavitation when there is no load, and can be easily installed or removed from existing construction machinery.
  • FIG. 1 is a conceptual diagram showing the overall appearance of a construction machine according to an embodiment of the present invention.
  • Figure 2 is a schematic diagram showing an energy recovery system for construction machinery according to an embodiment of the present invention.
  • Figure 3 is a perspective view showing a hydraulic motor assembly according to an embodiment of the present invention.
  • Figure 4 is a plan view showing a pressure accumulation assembly according to an embodiment of the present invention.
  • Figure 5 is a perspective view showing a pressure accumulation assembly according to an embodiment of the present invention.
  • Figure 6 is a plan view showing a cutaway bracket of an accumulating pressure assembly according to an embodiment of the present invention.
  • Figure 7 is an enlarged schematic diagram schematically showing the parasitic load reduction type energy conversion system installed in the energy recovery system for construction machinery according to an embodiment of the present invention.
  • CA CA valve
  • AR AR valve
  • PS1 first pressure sensor
  • PS2 Second pressure sensor
  • the present invention includes a cylinder in which a rod moves up and down by the flow of oil, a main control valve connected to the cylinder to selectively control the flow of oil provided to the cylinder, and a main control valve connected to the main control valve to provide oil to the cylinder.
  • An engine a boom that is driven up/down by the up/down of the cylinder due to oil flow, an accumulator that collects oil generated when the boom is boomed up/down and accumulates pressure, and when the boom is down based on an operation signal.
  • An energy conversion system for construction equipment including a control unit for recovering generated boom energy, comprising: a variable hydraulic motor connected to a shaft of an engine and providing rotational force to the shaft; A fourth line connecting the variable hydraulic motor and the accumulator; A ninth line connecting the variable hydraulic motor and the oil tank; and a pressure sensor unit installed on the variable hydraulic motor to detect oil pressure.
  • a parasitic load reduction type energy conversion system for construction equipment including.
  • FIG. 1 is a conceptual diagram showing the overall appearance of a construction machine according to an embodiment of the present invention.
  • Figure 2 is a schematic diagram showing an energy recovery system for construction machinery according to an embodiment of the present invention.
  • Figure 3 is a perspective view showing a hydraulic motor assembly according to an embodiment of the present invention.
  • Figure 4 is a plan view showing a pressure accumulation assembly according to an embodiment of the present invention.
  • Figure 5 is a perspective view showing a pressure accumulation assembly according to an embodiment of the present invention.
  • Figure 6 is a plan view showing a cutaway bracket of an accumulating pressure assembly according to an embodiment of the present invention.
  • Figure 7 is an enlarged schematic diagram schematically showing the parasitic load reduction type energy conversion system installed in the energy recovery system for construction machinery according to an embodiment of the present invention.
  • the parasitic load reduction type energy conversion system for construction machinery can be installed and utilized in an energy recovery system for construction machinery that recovers boom energy and reuses and recycles it. there is.
  • the energy recovery system for construction machinery is a structure that can be installed and released on construction machinery (100), and includes a main control valve (160), a hydraulic motor assembly (300), an accumulating pressure assembly (200), an oil tank (T), and a mobile ( 400) and a control unit 170, and may be installed by connecting to the main body 110, the boom 130, and the cylinder 140 of the construction machine 100.
  • a boom 130 and a cylinder 140 may be connected to the main body 110.
  • the cylinder 140 can move up and down by the flow of oil, and the boom 130 can rotate by the up and down operation of the cylinder 140.
  • An engine 120 may be disposed inside the main body 110.
  • the engine 120 may provide a flow of oil to the cylinder 140.
  • the engine 120 may provide driving force to a driving unit (not shown) disposed on the lower side of the main body 110.
  • the operation of the cylinder 140 will be examined in more detail as follows.
  • the construction machine 100 may have a cabinet 150 in the main body 110 on which a worker can ride.
  • a joystick 151 that can control the boom-up or boom-down operation of the boom 130 may be placed in the cabinet 150.
  • the cylinder 140 moves up and down by the flow of oil and may include a rod 141 connected to the boom 130.
  • the cylinder 140 may include a large chamber 142 and a small chamber 143 formed on the large chamber 142.
  • the rod 141 is disposed between the small chamber 143 and the large chamber 142 of the cylinder 140, and rises when oil flows into the large chamber 142, and falls when oil flows into the small chamber 143. can do.
  • the boom 130 can boom up, and when the rod 141 falls, the boom 130 can boom down.
  • the main control valve 160 is connected to the cylinder 140 and can selectively control the flow of oil provided to the cylinder 140.
  • the main control valve 160 may be placed on the construction machine 100.
  • the main control valve 160 may be connected to the large chamber 142 through the large chamber line 144, and the main control valve 160 may be connected to the small chamber 143 through the small chamber line 145.
  • a spool 161 may be disposed on the main control valve 160.
  • the flow of oil may be directed toward the small chamber 143 or toward the large chamber 142 by the spool 161. That is, the rod 141 of the cylinder 140 may rise or fall by the operation of the spool 161 disposed on the main control valve 160.
  • the engine 120 is provided with a shaft 121, and a main pump 122 may be connected to the shaft 121.
  • the main pump 122 and the spool 161 are connected to the main valve line 162, and oil can flow to the spool 161 and the main control valve 160 through the main valve line 162.
  • the spool 161 can be controlled by the boom up valve 163 and the boom down valve 164.
  • An auxiliary pump 123 may be connected to the shaft 121 of the engine 120.
  • the auxiliary pump 123 and the spool 161 are connected to the boom-up valve line 165, and the boom-up valve 163 may be disposed on the boom-up valve line 165.
  • the auxiliary pump 123 and the spool 161 are connected to the boom down valve line 166, and the boom down valve 164 may be disposed on the boom down valve line 166.
  • the hydraulic motor assembly 300 is connected to the engine 120 that provides the flow of oil, and can provide rotational force generated by the fluid to the engine.
  • the pressure accumulation assembly 200 is connected to the cylinder 140 and discharges the accumulated pressure to the cylinder 140, and the oil of the cylinder 140 can flow in and accumulate pressure.
  • the pressure accumulator assembly 200 includes a bracket 210, an accumulator 220, a valve assembly 230, and a main pipe 240.
  • the bracket 210 is detachably fastened to the main body 110 of the construction machine 100, and the accumulator 220, valve assembly 230, and main pipe 240 are disposed on the bracket 210.
  • the bracket 210 is a part installed on the construction machine 100, and consists of the accumulator 220, the valve assembly 230, and the main pipe 240.
  • the bracket 210 may be formed in a thin plate shape or a plate shape.
  • the bracket 210 may be placed outside the construction machine 100.
  • the bracket 210 may be provided with a fastening part (not shown) so that it can be fastened to the construction machine 100.
  • the fastening part (not shown) may be provided, for example, with a screw hole into which a bolt can be inserted.
  • the bracket 210 has a main pipe 240 and a valve assembly 230 disposed on the front side facing the boom 130, a hollow portion 212 is formed on the rear side, and an axis is formed between the front side and the rear side.
  • a press 220 may be disposed.
  • a groove 213 may be formed on the front side of the bracket 210.
  • the groove portion 213 may be formed by being depressed from the front end of the bracket 210 to the rear side.
  • the shape of the groove 213 is shaped to correspond to the shape of the outer surface of the cabinet 150 of the construction machine 100, thereby minimizing spatial interference between the cabinet 150 and the bracket 210.
  • the main pipe 240 and the valve assembly 230 may be disposed on the front side of the bracket 210 in a portion where the groove portion 213 is not formed. That is, a groove 213 may be formed on one side of the front side of the bracket 210, and the main pipe 240 and the valve assembly 230 may be disposed on the other side.
  • bracket 210 Due to this structure of the bracket 210, the portion of the bracket 210 where the main pipe 240 and the valve assembly 230 are placed can be placed closer to the boom 130, and thus the cylinder 140 The length of various pipes or lines connected to can be minimized, so the flow resistance of the oil flow can be minimized.
  • a hollow portion 212 may be formed on the rear side of the bracket 210.
  • An engine 120 may be disposed on the rear side of the pressure accumulation assembly 200.
  • the hollow portion 212 may reduce the weight of the bracket 210.
  • the hollow portion 212 may be formed not only on the rear side of the bracket 210, but also on the central or front side of the bracket 210.
  • the accumulator 220 may be arranged to be spaced apart from the rear end (rear end) of the bracket 210. Through this, even when the accumulator assembly 200 is installed on the construction machine 100, it is convenient to open the engine room for maintenance of the engine 120, and it can be easy for workers to separate and install the accumulator 220. . In addition, it is possible to prevent heat and vibration generated from the engine 120 from being directly transmitted to the accumulator 220.
  • a mount 211 may be disposed between the front and rear sides of the bracket 210.
  • the mount 211 is configured to mount the accumulator 220.
  • the accumulator 220 can be arranged at a predetermined distance from the upper surface of the bracket 210 by the mount 211. Accordingly, the accumulator 220 can be easily separated and installed, and heat and vibration generated in the engine 120 can be prevented from being directly transmitted to the accumulator 220.
  • the bracket 210 may be detachably installed on the construction machine 100.
  • the bracket 210 can be installed by modifying the exterior or interior of the existing construction machine 100.
  • the specific size or detailed shape of the bracket 210 may be partially modified depending on the construction machine 100 to be installed. Due to this configuration of the bracket 210, the energy recovery device according to the present invention can be easily and conveniently installed on various existing construction machines 100.
  • Oil may be accumulated in the accumulator 220, and when necessary, oil previously accumulated in the accumulator 220 may be discharged from the accumulator 220.
  • the main pipe 240 is connected to the cylinder 140.
  • the valve assembly 230 is connected to the main pipe 240.
  • the opening and closing of the valve assembly 230 can be controlled by the pilot pipe 250, respectively.
  • the valve assembly 230 includes a first line (L1), a second line (L2), a third line (L3), an AC valve (AC), and a CA valve (CA).
  • the first line L1 is a line connected to the large chamber 142 of the cylinder 140.
  • the first line L1 may be connected to the large chamber line 144.
  • the second line (L2) and the third line (L3) are lines connecting the first line (L1) and the accumulator 220.
  • An AC valve (AC) may be disposed in the second line (L2).
  • the AC valve (AC) is a valve provided to control the oil flow. It controls the flow of oil only from the second line (L2) toward the accumulator 220 and charges oil to the accumulator 220. It could be a valve.
  • a CA valve (CA) may be disposed in the third line (L3).
  • the CA valve (CA) is a valve provided to control the oil flow, and is a release valve that releases the oil in the accumulator 220 so that the oil flows only from the third line (L3) toward the first line (L1). It can be.
  • the valve assembly 230 may include a fifth line (L5) and a sixth line (L6).
  • the fifth line L5 is a line connected to the small chamber 143 of the cylinder 140.
  • the fifth line L5 may be connected to the small chamber line 145.
  • the sixth line (L6) is a line that branches off from the first line (L1) and is connected to the fifth line (L5).
  • An AB valve (AB) may be disposed in the sixth line (L6) to enable control of the flow rate of oil in the sixth line (L6).
  • the AB valve (AB) is a regeneration valve that introduces a portion of the oil flowing in the first line (L1) into the small chamber 143 of the cylinder 140 through the sixth line (L6) and the fifth line (L5). You can.
  • the valve assembly 230 may include a seventh line (L7).
  • the seventh line (L7) is a line that branches off from the first line (L1) and is connected to the third oil tank (T3), which will be described later.
  • An AR valve (AR) provided to control the flow rate of oil in the seventh line (L7) may be disposed in the seventh line (L7).
  • the AR valve (AR) may be a return valve through which a portion of the oil flowing into the accumulator 220 flows into the accumulator 220 when the accumulator 220 is full of oil.
  • the valve assembly 230 may further include an eighth line (L8) connected to the fifth line (L5) and the sixth line (L6).
  • the eighth line (L8) may be connected to the fourth oil tank (T4), which will be described later. Through the eighth line (L8), oil that has passed through the AB valve (AB) may flow into the fourth oil tank (T4).
  • the valve assembly 230 may include a release valve (RE).
  • the release valve (RE) is disposed on the flow path between the accumulator 220 and the second oil tank (T2), which will be described later.
  • the release valve (RE) operates in an on-off manner.
  • the valve assembly 230 may include a second solenoid valve (SOL2) connected in parallel to the release valve (RE). Specifically, a second solenoid valve (SOL2) valve may be connected to each pipe before and after the release valve (RE).
  • SOL2 second solenoid valve
  • a release valve (RE) and a second solenoid valve (SOL2) may be installed between the accumulator 220 and the second oil tank (T2).
  • CM valve CM
  • CA valve CA
  • AC valve AC
  • AB valve AB
  • AR AR
  • RE release valve
  • SOL2 second solenoid valve
  • the main pipe 240 is a pipe connected to the cylinder 140.
  • One main pipe 240 may be provided, and the first line L1 and the fifth line L5 may be formed simultaneously in the main pipe 240.
  • two main pipes 240 may be provided, and a first line (L1) and a fifth line (L5) may be formed separately in each.
  • a joint block 241 may be placed at the distal end of the main pipe 240.
  • the large chamber 142 and the small chamber 143 of the cylinder 140 may be connected to the joint block 241.
  • the oil tank (T) may be formed of at least one oil tank (T) to allow oil to flow in and be stored therein, or to allow the stored oil to flow out.
  • the oil tank (T) is a first oil tank (T1) connected to the hydraulic motor 310 of the hydraulic motor assembly 300 by a pipe, a release valve (RE), and a second solenoid valve (SOL2) connected to the second solenoid valve (SOL2) by a pipe. It may include a second oil tank (T2), a third oil tank (T3) connected to the seventh line, and a fourth oil tank (T4) connected to the eighth line.
  • the mobile 400 may be a terminal owned by a user or worker.
  • the mobile 400 may be communicatively connected to the control unit 170. Additionally, the mobile 400 may be controllably connected to the control unit 170, and the energy recovery system for construction machinery may be controlled by the mobile 400.
  • the operations of the hydraulic motor assembly 300 and the pressure accumulation assembly 200 can be controlled through the control unit 170 based on the operation signal of the mobile 400.
  • the mobile 400 may be provided with an input means for inputting a control command and an output means including a display means for displaying the operating states of the hydraulic motor assembly 300 and the pressure storage assembly 200.
  • the mobile 400 may be any one of a smartphone, PDA, laptop, or tablet.
  • the mobile 400 can communicate with the control unit 170 through serial communication and Ethernet communication, and can communicate with the control unit 170 using Wi-Fi, Bluetooth, and Zigbee. , communication can be made possible using beacons, RFID, etc., and the communication method of the mobile 400 is not limited to this.
  • a program or application for operating the energy recovery system for construction machinery may be installed in the mobile 400 through the control unit 170.
  • the control unit 170 may control the operation of the construction machine 100 based on the manipulation signal.
  • the control unit 170 may be an electronic control unit (ECU).
  • control unit 170 may operate the energy recovery system by controlling the operations of the hydraulic motor assembly 300 and the pressure accumulation assembly 200 based on the operation signal according to the control operation of the mobile 400.
  • the control unit 170 can control whether to open or close the boom-up valve 163 or the boom-down valve 164 based on a manipulation signal according to the control operation of the mobile 400.
  • control unit 170 can control the operation of the construction equipment 100 and whether the boom-up valve 163 or the boom-down valve 164 is opened or closed based on the operation signal of the joystick 151.
  • the joystick 151 may be equipped with a first sensor (S1) and a second sensor (S2).
  • the first sensor (S1) detects the pressure change during the boom-up operation of the joystick 151 and generates a manipulation signal
  • the second sensor (S2) detects the pressure change during the boom-down operation of the joystick 151 and operates it.
  • a signal can be generated.
  • the operation signal generated by the first sensor (S1) and the second sensor (S2) is transmitted to the control unit 170, and the control unit 170 operates the boom-up valve 163 or the boom-down valve ( 164) can be controlled to open or close.
  • the manipulation signal generated by the first sensor S1 and the second sensor S2 may be transmitted to the mobile 400 through the control unit 170. Through this, it is possible to control whether the boom-up valve 163 or the boom-down valve 164 is opened or closed using the mobile 400.
  • the boom down valve 164 may also be placed in the large chamber line 144. That is, the boom down valve 164 can control not only the flow of the boom down valve line 166 but also the flow of the large chamber line 144. In this case, depending on the situation, during the boom-down operation of the joystick 151, the control unit 170 controls the boom-down valve 164 to close, allowing oil to flow from the large chamber 142 to the main control valve 160. It may also block the flow.
  • a specific mode can be selected through the control unit 170, and the control unit 170 controls the operation of the hydraulic motor assembly 300 and the accumulator assembly 200 to operate the construction machine 100. It can be operated in various modes.
  • setting, changing, and canceling various modes can be accomplished by controlling the control unit 170 through the mobile device 400. Additionally, it can be controlled by the control unit 170 through a manipulation signal from the joystick 151.
  • the control unit 170 operates in an energy recovery mode in which the potential energy generated by boom-down operation of the construction machine 100 by manipulating the mobile 400 can be recovered to the accumulator 220.
  • Energy Recovery Mode a fuel saving mode (Eco Mode) that saves fuel by assisting the output of the engine 120 using the oil accumulated in the accumulator 220, the oil accumulated in the accumulator 220
  • a performance improvement mode (Power Mode) that can assist with the power required for the boom-up operation of the boom 130
  • a pressure relief mode Power Mode
  • Pressure Release Mode and Energy Recovery Off Mode, which can temporarily suspend the operation in which potential energy generated by boom down is recovered to the accumulator 220. It can work.
  • the energy recovery mode is for recovering and storing the potential energy resulting from boom down to the accumulator 220 and then reusing the stored energy.
  • the potential energy stored in the accumulator 220 is used. Can be used when setting fuel saving mode and performance improvement mode.
  • the boom down valve 164 When the boom 130 goes down, the boom down valve 164 is closed, oil flows into the small chamber 143 of the cylinder 140 to lower the rod 141 of the cylinder 140, and the rod (141) is lowered. As the oil 141) is lowered, the oil inside the large chamber 142 is discharged through the first line (L1).
  • Oil flowing in the first line (L1) flows into the accumulator 220 through the second line (L2), and the oil flowing into the accumulator 220 is used in fuel saving mode and performance improvement mode after accumulating pressure. It can be.
  • the potential energy of the boom 130 can be stored in the accumulator 220, and the stored potential energy can be used to save fuel or improve the performance of the construction machine 100. It can be improved.
  • the Energy Recovery Mode flows oil into the accumulator 220 when the boom is down and stores the potential energy of the boom 130 in the accumulator 220.
  • the boom-down speed can be increased by flowing oil into the small chamber (143).
  • the AB valve (AB) is opened to allow part of the oil flowing in the first line (L1) to flow through the sixth line (L6) and the fifth line (L5).
  • the remainder of the oil flowing in the first line (L1) can be flowed into the accumulator 220 through the second line (L2).
  • the boom down speed of the boom 130 can be increased by rapidly lowering the rod 141 by re-introducing the oil into the small chamber 143 and the process of accumulating oil in the accumulator 220.
  • an eighth line L8 may be further connected to the fifth line L5 and the sixth line L6.
  • the eighth line (L8) may be connected to the oil tank (T), that is, the fourth oil tank (T4). Through the eighth line (L8), oil that has passed through the AB valve (AB) may flow into the fourth oil tank (T4).
  • the AR valve (AR) is opened, and a portion of the oil flowing in the first line (L1) is transferred to the third line through the seventh line (L7). It can be introduced into the oil tank (T3).
  • the fifth sensor S5 may be disposed in the second line L2 and in front of the accumulator 220, and the fifth sensor S5 may measure the pressure in front of the accumulator 220. Therefore, it is possible to measure whether the accumulator 220 is full of oil using the fifth sensor S5.
  • the fuel saving mode is a mode that can save fuel by assisting the engine output using the oil accumulated in the accumulator 220.
  • the oil accumulated when the boom is down is used to assist the engine output when the boom is up. You can.
  • CM valve (CM) arranged in the fourth line (L4) is opened, the CA valve (CA) arranged in the third line (L3) is closed, and then the Oil accumulated in the compressor 220 is introduced into the hydraulic motor 310 of the hydraulic motor assembly 300 through the open fourth line L4.
  • the rotation axis of the hydraulic motor 310 of the hydraulic motor assembly 300 rotates due to the inflow of oil, and the rotation axis of the hydraulic motor 310 is provided to the shaft 121 of the engine 120.
  • the rotational force of the rotating shaft of the hydraulic motor 310 assists the output of the shaft 121 of the engine 120, thereby increasing the fuel efficiency of the engine 120.
  • the oil flowing into the hydraulic motor 310 may be discharged back to the first oil tank T1 through the pipe after rotating the rotation axis of the hydraulic motor 310.
  • the performance improvement mode is a mode that uses the oil accumulated in the accumulator 220 to assist the power required for the boom-up operation of the boom.
  • the accumulated oil flows into the large chamber 142 to load ( 141) can be carried out quickly.
  • the CA valve (CA) arranged in the third line (L3) is opened, the CM valve (CM) arranged in the fourth line (L4) is closed, and then the The oil accumulated in the compressor 220 flows into the large chamber 142 through the third line L3 and the first line L1.
  • the boom-up speed can be increased by increasing the amount of oil flowing into the large chamber 142, such as by flowing oil into the large chamber 142 through L1).
  • the AB valve (AB), AR valve (AR), and boom down valve 164 are closed, and only the CA valve (CA) disposed in the third line (L3) is opened to allow oil to flow into the third line (L3).
  • the pressure release mode is to relieve the pressure by discharging the oil accumulated in the accumulator 220 to the outside and to reduce the internal pressure of the accumulator 220.
  • the release valve (RE) is opened, and the CA valve (CA) of the third line (L3) and the CM valve (CM) of the fourth line (L4) are closed.
  • the release valve (RE) is provided in an on/off manner to enable only a simple opening or closing operation rather than precisely controlling the oil flow rate, but is not limited to this.
  • the release valve (RE) is opened to discharge a portion of the oil accumulated in the accumulator 220 to the second oil tank (T2) through the pipe connecting the accumulator 220 and the second oil tank (T2).
  • the internal pressure of the accumulator 220 can be reduced.
  • the release valve (RE) is always opened to remove a portion of the oil flowing into the accumulator 220.
  • the internal pressure of the accumulator 220 can be reduced by flowing into the oil tank (T2).
  • the second solenoid valve (SOL2) is opened to allow all of the oil in the accumulator 220 to flow into the second oil tank (T2), and the pressure relief mode is set for maintenance. You can proceed.
  • CA valve (CA) and CM valve (CM) are closed and only the second solenoid valve (SOL2) is opened.
  • the second solenoid valve (SOL2) is opened to Safety accidents, etc. can be prevented by flowing all of the oil in the compressor 220 into the second oil tank (T2) to relieve the internal pressure of the accumulator 220 and then proceed with maintenance.
  • the second solenoid valve (SOL2) when the release valve (RE) is opened, the second solenoid valve (SOL2) may be closed, and similarly, when the second solenoid valve (SOL2) is opened, the release valve (RE) may be closed.
  • the Energy Recovery Off Mode can temporarily suspend the operation in which potential energy generated by boom down is recovered to the accumulator 220.
  • the oil accumulation of the accumulator 220 may be stopped.
  • the third sensor (S3) and the fourth sensor (S4) may be placed on the first line (L1) and the fifth line (L5), and the third sensor (S3) and fourth sensor (S4) are always Oil pressure can be measured, and the measured oil pressure value can be transmitted to the control unit 170.
  • the control unit 170 can determine whether the boom 130 has reached the ground through these measurement values.
  • control unit 170 determines that the boom 130 has touched the ground, it closes the AC valve (AC) of the second line (L2) connected to the accumulator 220, thereby Oil pressure accumulation can be temporarily stopped.
  • both the AC valve (AC) and the AR valve (AR) are closed, and the AB valve (AB ) is opened to allow the oil discharged from the large chamber 142 to flow only into the small chamber 143, thereby temporarily stopping the accumulation of oil in the accumulator 220.
  • the AC valve (AC) disposed in the second line (L2) and the AR valve (AR) disposed in the seventh line (L7) are closed, and the AB valve (AB) disposed in the sixth line (L6) is closed.
  • opening it can be controlled so that all the oil discharged from the large chamber 142 flows into the small chamber 143.
  • the energy recovery mode is a basic setting mode that can be set while driving the construction machine 100, and can be set along with the general operation of the construction machine. That is, the construction machine 100 may be set to and operated in the energy recovery mode immediately after driving.
  • a parasitic load may be generated in the engine 120 if there is no recovery energy recovered from the boom energy, so the energy conversion system for construction machinery includes a parasitic load reduction type energy conversion system. can do.
  • the parasitic load reduction type energy conversion system for construction equipment includes a variable hydraulic motor 310, a fourth line (L4), a ninth line (L9), and a pressure sensor unit ( PS) may be included.
  • the variable hydraulic motor 310 is a device that generates rotational force by fluid, and may be included in the hydraulic motor assembly 330. When oil flows into the variable hydraulic motor 310, rotational force can be variably generated.
  • the rotation axis of the variable hydraulic motor 310 may be connected to the shaft 121 of the engine 120. Accordingly, the variable hydraulic motor 310 can variably provide rotational force to the shaft 121.
  • the fourth line (L4) can connect the variable hydraulic motor 310 and the accumulator 220. That is, the valve assembly 230 may include a fourth line (L4) connecting the accumulator 220 and the hydraulic motor 310.
  • the fourth line (L4) may include a CM valve (CM) provided to control the flow rate of oil. Accordingly, the oil accumulated in the accumulator 220 flows into the variable hydraulic motor 310 through the fourth line (L4), thereby rotating the variable hydraulic motor 310.
  • CM CM valve
  • CM valve may be a motor release valve that releases oil to the variable hydraulic motor 310.
  • the ninth line (L9) can connect the variable hydraulic motor 310 and the oil tank (T).
  • the oil tank (T) may be a first oil tank (T) connected to the variable hydraulic motor 310 through a ninth line (L9).
  • the variable hydraulic motor 310 may be installed in the engine room where the engine 120 is placed in the construction machine 100.
  • the variable hydraulic motor 310 may be provided with a fastening part (not shown) that can be fastened to the engine room.
  • the piping through which oil is introduced or discharged, the piping connected to the first oil tank T1, etc. may be provided to be connected to corresponding piping in existing construction machinery.
  • the pressure sensor unit (PS) is installed in the variable hydraulic motor 310 and can sense the pressure of oil.
  • the pressure sensor unit is a first pressure sensor (PS1) installed at the oil input end of the variable hydraulic motor 310 through which oil flows in, and at the oil output end of the variable hydraulic motor 310 through which oil is discharged. It may include a second pressure sensor (PS2).
  • the first pressure sensor (PS1) is disposed on the fourth line (L4) and measures the hydraulic pressure of the oil flowing from the accumulator 220 to the variable hydraulic motor 310 through the fourth line (L4) and operates the variable hydraulic motor ( 310), the presence/absence of oil flowing in can be determined.
  • control unit 170 minimizes the discharge amount of the variable hydraulic motor 310 to reduce the parasitic load of the engine 120. can be reduced.
  • the control unit 170 rotates by the inflow of oil to minimize the discharge amount of the variable hydraulic motor 310.
  • the parasitic load of the engine 120 can be reduced by controlling the rotation speed of the variable hydraulic motor 310 and controlling the torque of the engine 120 connected to the rotation axis of the variable hydraulic motor 310 through the shaft 121. there is.
  • the control unit 170 minimizes the discharge amount of the variable hydraulic motor 310.
  • the parasitic load of the engine 120 can be reduced.
  • control unit 170 minimizes the discharge amount of the variable hydraulic motor 310 to control the engine ( 120) parasitic load can be reduced.
  • the parasitic load of the engine 120 is reduced according to the hydraulic pressure of the oil measured through the first pressure sensor (PS1), but the parasitic load of the engine 120 is reduced through the second pressure sensor (PS2).
  • PS1 first pressure sensor
  • PS2 second pressure sensor
  • cavitation or load pressure within the variable hydraulic motor 310 can be detected.
  • the second pressure sensor PS2 is disposed in the ninth line L9 to measure the hydraulic pressure of the oil discharged from the variable hydraulic motor 310 to detect cavitation or load pressure within the variable hydraulic motor 310. You can.
  • control unit 170 may determine that a cavitation phenomenon has occurred within the variable hydraulic motor 310. .
  • the second pressure sensor (PS2) detects cavitation within the variable hydraulic motor 310 when the pressure of the oil discharged from the variable hydraulic motor 310 and flowing through the ninth line (L9) is below the preset pressure range. It can be judged that this has occurred.
  • the control unit 170 determines that the load pressure within the variable hydraulic motor 310 is increasing. can do.
  • the second pressure sensor PS2 detects the load within the variable hydraulic motor 310. It can be judged that the pressure is increasing.
  • the flow rate of oil discharged from the variable hydraulic motor 310 must be controlled according to the oil pressure measured through the second pressure sensor PS2.
  • a first solenoid valve (SOL1) for controlling the flow rate of oil may be installed in the ninth line (L9).
  • the first solenoid valve (SOL1) is controlled to control the oil discharged from the variable hydraulic motor 310 to the first oil tank (T1). Cavitation or load pressure can be reduced by variably controlling the discharge amount.
  • control unit 170 is discharged from the variable hydraulic motor 310 and flows through the ninth line (L9), but when the pressure of the oil measured through the second pressure sensor (PS2) is below the preset pressure range. , it is determined that a cavitation phenomenon has occurred within the variable hydraulic motor 310, and the amount of oil discharged from the variable hydraulic motor 310 can be controlled by adjusting the degree of opening and closing of the first solenoid valve (SOL1).
  • the control unit 170 sets the opening degree of the first solenoid valve (SOL1) to be smaller than the preset opening degree to control the variable hydraulic pressure.
  • the amount of oil discharged from the motor 310 can be adjusted to be small.
  • the control unit 170 controls the rotation speed of the variable hydraulic motor 310 to control the flow rate of the discharged oil. You can. Specifically, the control unit 170 may control the rotation speed of the variable hydraulic motor 310 to be slower than the preset rotation speed to reduce the amount of oil discharged.
  • control unit 170 is discharged from the variable hydraulic motor 310 and flows through the ninth line (L9), and the oil pressure measured through the second pressure sensor (PS2) exceeds the preset pressure range.
  • PS2 the oil pressure measured through the second pressure sensor
  • the amount of oil discharged from the variable hydraulic motor 310 can be controlled by adjusting the opening/closing degree or opening/closing amount of the first solenoid valve (SOL1). .
  • the control unit 170 increases the opening degree of the first solenoid valve (SOL1) than the preset opening degree.
  • the amount of oil discharged from the variable hydraulic motor 310 can be greatly adjusted.
  • the control unit 170 controls the rotation speed of the variable hydraulic motor 310 to control the flow rate of the discharged oil. You can control it. Specifically, the control unit 170 can control the rotation speed of the variable hydraulic motor 310 to be faster than the preset rotation speed to greatly adjust the amount of oil discharge.
  • control unit 170 may be connected to the variable hydraulic motor 310, the pressure sensor unit (PS), and the first solenoid valve (SOL1).
  • control unit 170 may control the flow rate of oil discharged from the variable hydraulic motor 310 by receiving the oil pressure measured through the pressure sensor unit (PS).
  • PS pressure sensor unit
  • the control unit 170 may receive the oil pressure measured through the pressure sensor unit (PS) and control the oil flow rate by adjusting the rotational speed of the variable hydraulic motor 310. Additionally, the control unit 170 may receive the oil pressure measured through the pressure sensor unit PS and control the oil flow rate by adjusting the first solenoid valve SOL1.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

La présente invention concerne un système de conversion d'énergie de réduction de charge parasite pour un engin de chantier, qui est capable de réduire une charge parasite portée par un moteur, dans un état dans lequel l'engin de chantier ne possède pas d'énergie récupérée. La présente invention offre les avantages de réduire la charge parasite portée par un moteur, d'empêcher la perte d'énergie d'un moteur, d'empêcher une cavitation de moteur dans des conditions sans charge, et de permettre une installation et un retrait faciles à partir d'engins de chantier existants.
PCT/KR2023/007221 2022-06-02 2023-05-25 Système de conversion d'énergie de réduction de charge parasite pour engin de chantier WO2023234643A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20220067762 2022-06-02
KR10-2022-0067762 2022-06-02
KR1020230067004A KR20230167711A (ko) 2022-06-02 2023-05-24 건설기계용 기생부하 저감형 에너지 변환 시스템
KR10-2023-0067004 2023-05-24

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WO2023234643A1 true WO2023234643A1 (fr) 2023-12-07

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110146261A1 (en) * 2009-12-23 2011-06-23 Caterpillar Inc. System and method for controlling an electro-hydraulic charging system
KR20120120056A (ko) * 2011-04-20 2012-11-01 제이.씨.뱀포드엑스커베이터스리미티드 유압회로 및 이를 구비한 작업 기계
KR20140061354A (ko) * 2011-07-25 2014-05-21 히다찌 겐끼 가부시키가이샤 건설 기계
KR20160079815A (ko) * 2013-11-06 2016-07-06 캐터필러 에스에이알엘 유압 회로 및 작업 기계
KR20210136084A (ko) * 2019-04-05 2021-11-16 볼보 컨스트럭션 이큅먼트 에이비 유압기계

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110146261A1 (en) * 2009-12-23 2011-06-23 Caterpillar Inc. System and method for controlling an electro-hydraulic charging system
KR20120120056A (ko) * 2011-04-20 2012-11-01 제이.씨.뱀포드엑스커베이터스리미티드 유압회로 및 이를 구비한 작업 기계
KR20140061354A (ko) * 2011-07-25 2014-05-21 히다찌 겐끼 가부시키가이샤 건설 기계
KR20160079815A (ko) * 2013-11-06 2016-07-06 캐터필러 에스에이알엘 유압 회로 및 작업 기계
KR20210136084A (ko) * 2019-04-05 2021-11-16 볼보 컨스트럭션 이큅먼트 에이비 유압기계

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