Classifications

• • 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
  • E02F9/26—Indicating devices
  • E02F9/264—Sensors and their calibration for indicating the position of the work tool
• • 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
  • E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F3/00—Dredgers; Soil-shifting machines
  • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
  • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
  • E02F3/36—Component parts
  • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
  • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
  • E02F3/435—Control of dipper or bucket position; Control of sequence of drive operations for dipper-arms, backhoes or the like

Definitions

• the present disclosure generally relates to construction machinery.
• the present disclosure relates to construction machinery.
• the present disclosure can be applied to large vehicles such as trucks, buses, and construction equipment. While the present disclosure may be described with reference to specific vehicles, it is not limited to any particular type of vehicle.
• an excavator is a type of construction machinery capable of performing various operations at construction sites and the like, including excavation work for digging earth, loading work for transporting soil, trenching work for foundation construction, crushing work for building demolition, leveling work for site preparation, and grading work for surface smoothing.
• Control valves for such purposes of the excavator are equipped with a relief valve to prevent damage to the hydraulic device.
• a load pressure corresponding to the excavation load is generated inside the hydraulic actuator.
• the relief valve opens upon reaching a predetermined set pressure to prevent the pressure in the hydraulic circuit from exceeding the pressure resistance of the hydraulic device due to an increase in load pressure, thereby discharging hydraulic fluid to the tank.
• a construction machine including: a first hydraulic pump and a second hydraulic pump for discharging working fluid; a first hydraulic line connected to the first hydraulic pump; a second hydraulic line connected to the second hydraulic pump; a first spool connected to the first hydraulic line and configured to control a flow of the working fluid supplied to an actuator; a second spool connected to the second hydraulic line and configured to control flow of the working fluid supplied to the actuator; a relief valve disposed on the first hydraulic line and the second hydraulic line; a first pressure sensor and a second pressure sensor respectively disposed on the first hydraulic line and the second hydraulic line to measure pressures of the first and second hydraulic pumps, respectively; an operation lever configured to output an operation signal corresponding to an operator's manipulation amount; an electronic control unit configured to provide operation information of the actuator based on the pressures measured by the first and second pressure sensors and the operation signal output from the operation lever; and an output unit configured to output information from the electronic control unit.
• the first aspect of the present disclosure may provide construction machinery that recommends actuator
• the electronic control unit may include a work pattern analysis unit configured to analyze data of operation signals from the operation lever and determine the current work pattern.
• the electronic control unit may include a guide unit configured to provide operation information of the actuator.
• the guide unit may output boom raise or boom lower feedback to the output unit under predetermined conditions.
• the predetermined conditions may include: the current work pattern being classified as an excavation operation by the work pattern analysis unit, the pressure of the first hydraulic pump or the second hydraulic pump exceeding a preset relief pressure, and an arm-in operation signal of the operation lever exceeding a preset value.
• the guide unit may output arm-out feedback to the output unit under predetermined conditions.
• the predetermined conditions may include: the current work pattern being classified as an excavation operation by the work pattern analysis unit; the pressure of the first hydraulic pump or the second hydraulic pump exceeding a preset relief pressure; and the boom up operation signal of the operation lever exceeding a preset value.
• the electronic control unit may include a computation unit configured to calculate a relief operation ratio, which represents the proportion of operation time performed under a relief condition relative to the total operation time.
• the relief operation ratio may be defined as relief operation time / total operation time * 100.
• the output unit may be configured to visualize and display the relief operation ratio.
• a technical advantage is that the operator can more intuitively recognize the current relief operation ratio via a graph displayed on the display.
• the output unit may display the relief operation ratio using different colors according to the numerical value.
• the output unit may be configured to visualize and display a preset target relief operation ratio together with the visualized relief operation ratio.
• the output unit may be a display provided in an operator cab.
• FIG. 1 is a perspective view illustrating a basic configuration of a general construction machine.
• a construction machine 100 such as an excavator, includes a cab 10, a lower traveling body 20, an upper rotating body 30 rotatably installed on the lower traveling body 20, a working device 40 installed on the upper rotating body 30 to be operable in the vertical direction, and an actuator 50.
• an output unit may be provided to allow the operator to recognize the operating information of the excavator during work.
• the work device 40 is formed as a multi-joint structure and includes a boom 41 having a rear end pivotally supported by the upper revolving body 30, an arm 42 having a rear end pivotally supported at a front end of the boom 41, and a bucket 43 pivotally installed at a front end of the arm 42.
• the actuator 50 includes a boom cylinder 51 (work actuator), an arm cylinder 52 (work actuator), and a bucket cylinder 53 (work actuator).
• the boom cylinder 51, arm cylinder 52, and bucket cylinder 53 each being a working actuator, respectively operate the boom 41, arm 42, and bucket 43.
• FIG. 2 is a block diagram illustrating a basic configuration of the construction machine
• FIG. 3 is a schematic diagram illustrating the overall configuration of the construction machine.
• the construction machine 100 may include a hydraulic pump 110, a spool 120, a relief valve 130, a pressure sensor 140, an operation lever 150, an electronic control unit 160, and an output unit 170.
• the hydraulic pump 110 is driven by an engine and discharges high-pressure working fluid to operate the actuator 50.
• the hydraulic pump 110 may include first and second hydraulic pumps 111, 112.
• the spool 120 moves by working fluid being discharged from the hydraulic pump 110 to operate first and second actuators 50a, 50b. More specifically, the first actuator 50a is operated by receiving working fluid supplied from the first hydraulic pump 111, and the second actuator 50b may be operated by receiving hydraulic fluid supplied from the second hydraulic pump 112.
• the first and second actuators 50a, 50b may, for example, be the aforementioned boom cylinder 51, arm cylinder 52, and bucket cylinder 53, but are not limited thereto.
• the spool 120 may include a first spool 121 and a second spool 122. More specifically, the first hydraulic pump 111 and the first spool 121 are connected by a first hydraulic line 121a, and the second hydraulic pump 112 and the second spool 122 may be connected by a second hydraulic line 122a.
• the first spool 121 is located on a flow path connecting the first hydraulic pump 111 and the first actuator 50a and controls the flow of working fluid supplied from the first hydraulic pump 111 to the first actuator 50a.
• the second spool 122 is located on a flow path connecting the second hydraulic pump 112 and the second actuator 50b and controls the flow of working fluid supplied from the second hydraulic pump 112 to the second actuator 50b.
• the relief valve 130 may be disposed between the first hydraulic line 121a and the second hydraulic line 122a.
• the relief valve 130 may include first and second relief valves (not shown) connected to the respective hydraulic lines 121a and 122a. Relief pressures may be set for the first and second relief valves. Accordingly, when an abnormal high pressure is generated in the first hydraulic line 121a, the first relief valve opens, thereby maintaining the relief pressure in the first hydraulic line 121a. Similarly, when an abnormal high pressure is generated in the second hydraulic line 122a, the second relief valve opens, thereby maintaining the relief pressure in the second hydraulic line 122a.
• the pressure sensor 140 is connected to the first and second hydraulic lines 121a and 122a between the spool 120 and the hydraulic pump 110, senses the pressure of the hydraulic pump 110 to determine whether relief occurs, and may provide the sensed pressure value to the electronic control unit 160. That is, the first and second pressure sensors 141 and 142 may be respectively disposed on the outlets of the first and second hydraulic pumps 111 and 112 from which working fluid is discharged.
• the operation lever 150 may be a hydraulic joystick or an electric joystick, preferably an electric joystick(electric joystick) that generates an electrical signal proportional to the manipulation of the operator amount and provides the signal to the electronic control unit 160.
• FIG. 4 is a block diagram of the electronic control unit.
• the electronic control unit 160 determines the operator's current work pattern based on the pressure values of the hydraulic pump 110 provided from the pressure sensor 140 and the electrical signals of the operation lever 150, outputs appropriate control information for the current work pattern to the output unit 170, and may include a work pattern analysis unit 161, a calculation unit 162, a guide unit 163, and a storage unit 164.
• the work pattern analysis unit 161 analyzes the input control signals of the operation lever 150 to analyze the work pattern of the currently ongoing operation. More specifically, the work pattern analysis unit 161 uses machine learning techniques based on collected or pre-stored big data stored in the storage unit 164 to analyze the correlation between specific operations and the manipulation amount of the operation lever 150, and selects one work pattern from among various work patterns based on the analyzed correlation.
• the work pattern analysis unit 161 analyzes the input control signals of the operation lever 150 and classifies the current work pattern as one of excavation work, lifting work for transporting earth and sand, demolition work for dismantling buildings, or leveling work for ground preparation.
• the work pattern analysis unit 161 may store data regarding the correlation between the input control signals of the operation lever 150 and the classified work pattern in the storage unit 164.
• the work pattern analysis unit 161 may output the classified work pattern to the output unit 170.
• the calculation unit 162 calculates the ratio of the total cumulative work performed without relief being activated based on the pressure value provided from the hydraulic pump 110.
• the calculation unit 162 starts calculating the total work time when the pressure sensor 140 of the hydraulic pump 110 detects a pressure exceeding 0, and further calculates the time during which the pressure exceeds a predetermined set value to compute the relief operation ratio. More specifically, the calculation unit 162 calculates the total work time starting from the moment when the pressure of one or more of the first hydraulic pump 111 or the second hydraulic pump 112 is non-0. In addition, the calculation unit 162 calculates the time during which the pressure of one or more of the first hydraulic pump 111 or the second hydraulic pump 112 exceeds a predetermined relief pressure (for example, 320 bar) as the relief operation time.
• a predetermined relief pressure for example, 320 bar
• the relief operation ratio (%) may be calculated as (relief operation time ⁇ total work time)x100.
• the current work ratio (%) representing the proportion of work performed without relief during the total cumulative work may be calculated as [(total work time - relief operation time) / total work time] * 100.
• the guide unit 163 outputs information related to recommended operations for the work classified by the work pattern analysis unit 161 to the output unit 170.
• FIGS. 5 and 6 illustrate an example of operation recommendation by the guide unit 163.
• An example where the work pattern analysis unit 161 classifies the operator's work pattern as an excavation operation will be described below with reference to FIGS. 5 and 6 .
• the guide unit 163 outputs feedback to the output unit 170 instructing to move the boom 41.
• the bucket 43 may be released from the rock root, thereby allowing the operator to exert less force on the lever while achieving the same output, which can improve productivity.
• the guide unit 163 outputs feedback to the output unit 170 to move the arm 42. According to the feedback, the operator can extend the arm 42 to proceed with the excavation work; therefore, the operator can exert less force on the operation lever while achieving the same output, which can result in improved productivity.
• the guide unit 163 outputs feedback to the output unit 170 recommending a high-power mode when the relief operation ratio exceeds a preset value.
• the storage unit 164 may store big data on the correlation between the operation signals of the operation lever 150 and the corresponding work patterns, as well as algorithms for machine learning.
• the storage unit 164 may store data relating to preset values for the operation signals of the operation lever 150.
• the storage unit 164 may store data on the correlation between the input operation signals of the operation lever 150 and the work patterns classified by the work pattern analysis unit 161.
• the output unit 170 feeds back the output value outputted from the electronic control unit 160 to the operator.
• the output unit 170 is provided in the operator cabin and may be a display that provides visual feedback; however, it is not limited thereto and may be a speaker that provides auditory feedback.
• FIG. 7 is a diagram illustrating an example of the output unit.
• the output unit 170 may visualize and output the relief operation ratio calculated by the arithmetic unit 162.
• the relief operation ratio graph 171 is visualized as a ring-shaped graph and may be displayed on one side of the output unit 170.
• the output unit 170 may display only the area corresponding to the relief operation ratio in the graph 171. For example, as shown, when the relief operation ratio is approximately 25%, only the area corresponding to 25% of the entire graph 171, designated as 171a, may be filled and displayed to the user. Additionally, information 171b regarding a preset target relief operation ratio may be displayed inside the graph 171.
• the graph 171 visualizing the relief operation ratio may also display the target relief operation ratio information 171b.
• the user can easily compare the relief operation ratio and the target relief operation ratio through the graph 171.
• the present disclosure is not limited thereto, and the area 171a of the graph 171 corresponds to the current operation ratio, while information 171b regarding the target operation ratio may be displayed inside the graph 171.
• the output unit 170 may display the graph 171 in different colors depending on the relief operation ratio or the current operation ratio. For example, when the current operation ratio is 90% or more, that is, the relief operation ratio is less than 10%, the graph 171 may be displayed in green. When the current operation ratio is less than 90%, that is, the relief operation ratio is 10% or more, the graph 171 may be displayed in yellow. Additionally, when the current operation ratio is less than 50%, that is, the relief operation ratio is 50% or more, the graph 171 may be displayed in red. In this way, when the relief operation ratio or the current operation ratio is visualized by a graph, the operator can more intuitively understand the current relief operation ratio or the current operation ratio.
• the color, shape, and numerical values of the graph may be variously modified and implemented.
• first and second may be used herein to describe various components, it is to be understood that these components are not limited by these terms. These terms are used solely to distinguish one element from another.
• the first component may be referred to as the second component, and similarly, the second component may be referred to as the first component.

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• Engineering & Computer Science (AREA)
• Mining & Mineral Resources (AREA)
• Civil Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structural Engineering (AREA)
• Operation Control Of Excavators (AREA)
• Fluid-Pressure Circuits (AREA)

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Publications (1)

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ID=91897072

Family Applications (1)

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• 2023
  • 2023-01-12 EP EP23916340.5A patent/EP4650531A1/fr active Pending
  • 2023-01-12 WO PCT/KR2023/000581 patent/WO2024150855A1/fr not_active Ceased

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