EP3382108B1 - Dispositif pour réduire l'impact durant le déplacement d'une machine de construction - Google Patents

Dispositif pour réduire l'impact durant le déplacement d'une machine de construction Download PDF

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Publication number
EP3382108B1
EP3382108B1 EP16876075.9A EP16876075A EP3382108B1 EP 3382108 B1 EP3382108 B1 EP 3382108B1 EP 16876075 A EP16876075 A EP 16876075A EP 3382108 B1 EP3382108 B1 EP 3382108B1
Authority
EP
European Patent Office
Prior art keywords
pressure
travel
pilot
construction machinery
reducing valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16876075.9A
Other languages
German (de)
English (en)
Other versions
EP3382108A1 (fr
EP3382108A4 (fr
Inventor
Hyun-sik LIM
Kwan-Soo Han
Jai-seok BANG
Jong-Ki Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HD Hyundai Infracore Co Ltd
Original Assignee
Doosan Infracore Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Publication of EP3382108A1 publication Critical patent/EP3382108A1/fr
Publication of EP3382108A4 publication Critical patent/EP3382108A4/fr
Application granted granted Critical
Publication of EP3382108B1 publication Critical patent/EP3382108B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • 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
    • E02F9/2253—Controlling the travelling speed of vehicles, e.g. adjusting travelling speed according to implement loads, control of hydrostatic transmission
    • 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
    • E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • 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
    • E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • E02F9/2228—Control of flow rate; Load sensing arrangements using pressure-compensating valves including an electronic controller
    • 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
    • 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
    • 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
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2285—Pilot-operated systems
    • 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

Definitions

  • the present invention relates to a travelling shock reducing device for construction machinery and a control method for construction machinery using the same, more particularly, to a travelling shock reducing device for construction machinery configured to control an amount of a hydraulic oil discharged from a hydraulic pump and a control method for construction machinery using the same.
  • Construction machinery for example, wheel type excavator may travel forward and backward using a hydraulic oil discharged from a hydraulic pump.
  • an amount of the hydraulic oil discharged from the hydraulic pump may be controlled by a manipulation amount of a travel pedal.
  • the amount of the hydraulic oil discharged from the hydraulic pump may be increased rapidly.
  • a travel speed may be increased rapidly thereby causing a shock on the driver.
  • EP 2 587 074 A1 describes a hydraulic pump control system for construction machinery.
  • US 2014/366518 A1 describes a hydraulic system of a construction machine and the system includes a pressure reducing valve which is configured to control a flow rate.
  • An object of the present invention provides a hydraulic system for wheel type construction machinery.
  • a hydaulic system is defined in independent claim 1.
  • a magnitude of the pilot pump generated by the travel manipulation portion when a magnitude of the pilot pump generated by the travel manipulation portion is increased in a first ratio, a magnitude of the pilot pump supplied from the pressure reducing valve to the hydraulic pump may be increased in a second ratio less than the first ratio.
  • the travel manipulation portion may include a travel pedal.
  • the travelling shock reducing device for construction machinery may further include an angle sensor configured to detect an angle change of the travel pedal.
  • the sensing portion may include a pressure sensor configured to detect a change in the pilot pressure.
  • the pressure sensor may include a pressure switch.
  • the pressure reducing valve may include electronic proportional pressure reducing (EPPR) valve.
  • EPPR electronic proportional pressure reducing
  • the pressure reducing valve may control such that a magnitude of a second pilot pressure adjusted by the pressure reducing valve is in proportion to a control signal received from the controller.
  • the pressure reducing valve may control such that a magnitude of second pilot pressure adjusted by the pressure reducing valve is in inverse proportion to a control signal received from the controller.
  • the travelling shock reducing device for construction machinery may further include a regulator installed between the pressure reducing valve and the hydraulic pump.
  • the hydraulic pump may be a variable displacement hydraulic pump.
  • a travelling shock reducing device for construction machinery may control to gently increase an amount of a hydraulic oil supplied to a travel motor even when a driver manipulates quickly a travel manipulation portion.
  • a shock caused by the driver's quick manipulation during travel may be reduced.
  • Example embodiments will be described more fully hereinafter with reference to the accompanying drawings, in which example embodiments are shown.
  • Example embodiments may, however, be embodied in many different forms and should not be construed as limited to example embodiments set forth herein. Rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of example embodiments to those skilled in the art.
  • the sizes and relative sizes of components or elements may be exaggerated for clarity.
  • first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of example embodiments.
  • spatially relative terms such as “beneath,” “below,” “lower,” “above,” “upper” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the exemplary term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
  • FIG. 1 is a hydraulic circuit diagram illustrating a travel system for construction machinery.
  • FIG. 2 is a graph illustrating operating characteristics of a pressure reducing valve in FIG. 1 .
  • a travel system for construction machinery may include a hydraulic pump 10, a travel motor 20 receiving a hydraulic oil discharged from the hydraulic pump 10 to travel the construction machinery, a main control valve 30 configured to control a direction of the hydraulic oil supplied to the travel motor 20, a travel manipulation portion 40 to generate a pilot pressure for controlling the hydraulic pump 10 in response to a manipulation of a driver, and a travelling shock reducing device configured to reduce shock caused by driver's quick handling for travel.
  • the construction machinery may include a wheel excavator, a wheel loader, a forklift, etc.
  • a case that the construction machinery includes a wheel type excavator will be explained for convenience of explanation.
  • the travelling shock reducing device according to the inventive concept may be applied not be limited to control only the wheel excavator, and may be applied to the wheel loader, the forklift, etc.
  • the hydraulic pump 10 may be connected to an output shaft of an engine. As the output shaft rotates, the hydraulic pump 10 may be driven to discharge the hydraulic oil.
  • the hydraulic oil may be stored in an oil tank T, and the hydraulic oil discharged from the hydraulic pump 10 may be supplied to the travel motor 20, a swing motor and actuators through the main control valve 30. And then, the supplied hydraulic oil may be drained to the oil tank T.
  • the actuators may include a hydraulic cylinder for driving a work apparatus such as a boom, an arm, a bucket, etc.
  • the hydraulic pump 10 may be a variable displacement hydraulic pump.
  • the variable displacement hydraulic pump may be a swash plate type axial piston pump.
  • the swash plate may be a disk installed at an oblique angle with respect to a rotating axis of the hydraulic pump 10.
  • An amount of the hydraulic oil discharged from the hydraulic pump 10 may be changed according to the oblique angle with respect to the rotating axis. That is, by varying the angle of the swash plate, the amount of the hydraulic oil discharged from the hydraulic pump 10 may be adjusted.
  • the angle of the swash plate is increased, the amount of the hydraulic oil discharged from the hydraulic pump 10 may be increased, while as the angle of the swash plate is decreased, the amount of the hydraulic oil discharged from the hydraulic pump 10 may be decreased.
  • the hydraulic motor 20 may receive the hydraulic oil from the hydraulic pump 10 to generate a travel driving force.
  • the travel driving force may be transferred to a driving axle via a transmission connected to the hydraulic motor 20.
  • the construction machine may travel forward and backward.
  • the main control valve 30 may receive the hydraulic oil from the hydraulic pump 10 to control a pressure, an amount, a direction, etc of the hydraulic oil supplied to the travel motor 20.
  • the main control valve may control the direction of the hydraulic oil supplied to the travel motor such that the construction machinery may travel forward or backward according to the direction of the supplied hydraulic oil and perform various works using the work apparatus.
  • FIG. 1 One hydraulic pump 10 and one travel motor 20 connected by the main control valve 30 are illustrated in FIG. 1 , however, it may not be limited thereto.
  • the main control valve may be connected to a plurality of hydraulic motors, and the main control valve may control an amount of the hydraulic oil supplied to the swing motor and the actuators.
  • the travel manipulation portion 40 may be installed in a cabin of the construction machinery, and may generate a pilot pressure corresponding to the manipulation of a driver.
  • the pilot pressure may be supplied to the hydraulic pump 10 to control the angle of the swash plate, or may be supplied to the main control valve 30 to control the amount of the hydraulic oil supplied to the travel motor 20.
  • the travel manipulation portion may be a travel pedal.
  • the construction machinery may include a pilot pump (not illustrated) which supplies a control oil for controlling the swash plate and/or the main control valve 30.
  • the control oil may include a material substantially the same as the hydraulic oil.
  • the pilot pump may be connected to the output shaft of the engine, and as the output shaft rotates, the pilot pump may be driven to discharge the control oil.
  • the discharged control oil may have a pilot pressure corresponding to the manipulation of a driver.
  • the travel manipulation portion 40 may generate a pilot pressure corresponding to the manipulation signal.
  • the pilot pressure may be supplied to the hydraulic pump 10 through a pilot line 50, to thereby control the angle of the swash angle.
  • the pilot line 50 may include a first pilot line 52 and a second pilot line 54.
  • the first pilot line 52 may be a pilot line between the travel manipulation portion 40 and a below mentioned pressure reducing valve 120
  • the second pilot line 54 may be a pilot line between the pressure reducing valve 120 and the hydraulic pump 10.
  • a pressure of the control oil flowing through the first pilot line 52 may be referred to as a first pilot pressure, and a pressure of the control oil flowing through the second pilot line 54.
  • the first pilot pressure may be the pilot pressure corresponding to the manipulation signal of a driver
  • the second pilot pressure may be a pilot pressure of the control oil supplied to the hydraulic pump 10 for controlling the angle of the swash plate.
  • the travelling shock reducing device may further include a regulator 140 installed in the pilot line 50.
  • the regulator 140 may control to maintain an amount and a pressure of the hydraulic oil discharged from the hydraulic pump 10 constantly regardless of load.
  • the travelling shock reducing device may include a pressure sensor 100 configured to detect the pilot pressure generated by the travel manipulation portion 40, an angle sensor 110 configured to detect a manipulation amount of the manipulation portion 40, a controller 130 configured to receive information detected from the sensors 100, 110 and to generate a control signal for controlling the pilot pressure, and the pressure reducing valve 120 configured to control a magnitude of the pilot pressure according to the control signal.
  • the pressure sensor 100 may be installed in the first pilot line 52, and may detect the magnitude of the first pilot pressure.
  • the detected pressure information may be transmitted to the controller 130 through wireless transmission, for example, CAN (controller area network), LIN (local interconnect network), FlexRay, etc.
  • the pressure sensor may be connected to the controller 130 through a wire.
  • the pressure sensor may be a pressure switch.
  • the pressure switch may compare the pressure of the first pilot line 52 with a predetermined pressure to be turned ON or OFF. That is, when the first pilot pressure is greater than or identical to the predetermined pressure, the pressure switch may be turned ON and the pressure information may be transmitted to the controller 130.
  • the pressure sensor 100 may transmit the first pilot pressure to the controller 130 constantly or periodically.
  • the angle sensor 110 may be installed in the travel manipulation portion 40, and may detect a manipulation amount of the travel manipulation portion 40.
  • the angle sensor may detect a change in an inclination angle of the travel manipulation portion with respect to a gravitational direction, or a change in a relative position between the travel manipulation portion and a bottom surface of the cabin.
  • the detected angle information may be transmitted to the controller 130 through wireless transmission, for example, CAN (controller area network), LIN (local interconnect network), FlexRay, etc.
  • the angle pressure sensor may be connected to the controller 130 through a wire.
  • the travelling shock reducing device may include the pressure sensor 100 and may not include the angle sensor 110.
  • the travelling shock reducing device may include the angle sensor 110 and may not include the pressure sensor 100.
  • the pressure of the control oil flowing through the first pilot line 52 may be determined by the manipulation amount of a driver.
  • the manipulation amount may be in proportion to the extent that the driver manipulates the travel manipulation portion 40.
  • the angle of the travel manipulation portion 40 detected by the angle sensor 110 and the first pilot pressure detected by the pressure sensor 100 may be converted to each other.
  • the travelling shock reducing device may include any one selected from the pressure sensor 100 and the angle sensor 110.
  • the pressure reducing valve 120 may be installed in the pilot line 50, and may receive the control signal from the controller 130.
  • the pressure reducing valve 120 may control the magnitude of the second pilot pressure supplied to the hydraulic pump 10 corresponding the received control signal.
  • the pressure reducing valve may include electronic proportional pressure reducing (EPPR) valve.
  • the electronic proportional pressure reducing valve may generate a pilot pressure corresponding to the magnitude of the received control signal, for example, the magnitude of current. That is, the magnitude of the second pilot pressure may be determined according to the magnitude of the control signal received from the controller 130.
  • the pressure reducing valve 120 may control such that the magnitude of the second pilot pressure may be in inverse proportion to the control signal received from the controller 130.
  • the magnitude of the second pilot pressure may be a first pressure P1 (point A).
  • the magnitude of the second pilot pressure may be a second pressure P2 (point B).
  • the second current C2 may be greater than the first current C1
  • the first pressure P1 may be greater than the second pressure P2. That is, the greater the magnitude of the control signal inputted to the pressure reducing valve 120 is, the less the magnitude of the second pilot pressure outputted through the second pilot line 54 is.
  • the controller 130 may receive the information on the pressure of the first pilot line 52 and the information on the manipulation amount of the travel manipulation portion 40 from the pressure sensor 100 and the angle sensor 110. The controller 130 may determine whether or not the driver manipulates quickly the travel manipulation portion 40, based on the received information. When it is determined that the driver manipulates quickly the travel manipulation portion 40, the control signal may be outputted to the pressure reducing valve 120 to control such that the second pilot pressure may be increased gently. When the second pilot pressure is increased gently, the angle of the swash plate of the hydraulic pump 10 may be increased gently, and accordingly, the amount of the hydraulic oil supplied to the travel motor 20 may be increased gently. Thus, the travelling shock caused by the driver's quick manipulation may be reduced.
  • the controller may be an electronic control unit (ECU).
  • the travelling shock reducing device for construction machinery may control to gently increase the amount of the hydraulic oil supplied to the travel motor 20 even when the driver manipulates quickly the travel manipulation portion 40.
  • FIG. 3 is a flow chart illustrating a method of controlling construction machinery using the travel system in FIG. 1 .
  • FIG. 4 is graphs illustrating changes in a pilot pressure and an input current.
  • manipulation information on a travel manipulation portion may be obtained (S100).
  • a first pilot pressure may be generated in a first pilot line 52 corresponding to the manipulation amount.
  • a controller 130 may receive information on the first pilot pressure from a pressure sensor 100 installed in the first pilot line 52.
  • the controller 130 may receive information on an angle of the travel manipulation portion 40 from an angle sensor installed in the travel manipulation portion 40.
  • the controller 130 may determine a manipulation state of the travel manipulation portion 40 using the received pressure information or angle information.
  • the travel manipulation portion may be a travel pedal.
  • the controller 130 may determine that the driver has manipulated quickly the travel manipulation portion 40.
  • the predetermined pressure may be set in consideration of dimensions of the construction machinery, kinds of a selected change gear step, working conditions, etc.
  • the controller 130 may determine that the driver has manipulated quickly the travel manipulation portion 40.
  • the predetermined pressure may be set in consideration of dimensions of the construction machinery, kinds of a selected change gear step, working conditions, etc.
  • an amount of a hydraulic oil discharged from a hydraulic motor may be controlled to be increased gently (S120).
  • the controller 130 may control such that an angle of a swash angle of the hydraulic pump 10 may be increased gently. Thus, a rapid increase in the amount of the hydraulic oil discharged from the hydraulic pump 10 may be prevented, to thereby suppress the travelling shock.
  • a first pilot pressure may be generated in the first pilot line 52 corresponding to the manipulation amount.
  • the pressure sensor 100 may detect and provide the first pilot pressure to the controller 130.
  • the controller 130 may compare the first pilot pressure with the predetermined pressure to determine whether or not the driver manipulates quickly the travel manipulation portion 40.
  • the controller 130 may increase the magnitude of the current inputted to the pressure reducing valve 120.
  • the pressure reducing valve 120 may be switched to the right direction.
  • the pilot pressure supplied to the swash plate that is, the second pilot pressure may be decreased to be less than the first pilot pressure.
  • the controller 130 may decrease the magnitude of the input current gently.
  • the second pilot pressure may be increased gently until the second pilot pressure reaches the magnitude of the first pilot pressure, and accordingly, the amount of the hydraulic oil discharged from the hydraulic pump 10 may be increased gently.
  • the process of controlling the pilot pressure by the controller 130 is illustrated in FIG. 4 .
  • the first and second pilot pressures may be zero, and the current inputted to the pressure reducing valve 120 may be a minimum value.
  • the first pilot pressure may be increased quickly corresponding to the manipulation amount of the travel manipulation portion 40.
  • the controller 130 may increase quickly the current inputted to the pressure reducing valve 120.
  • the increase in the second pilot pressure may not be relatively large.
  • the controller 120 may decrease gently the magnitude of the current inputted to the pressure reducing valve 120.
  • the second pilot pressure may be increased gently until the second pilot pressure reaches the magnitude of the first pilot pressure (third zone, III).
  • a decreasing rate of the input current and an increasing rate of the second pilot pressure may be set in consideration of dimensions of the construction machinery, kinds of a selected change gear step, working conditions, etc.
  • the input current is decreased in a linear fashion, however, it may not be limited thereto.
  • the input current may be decreased in a parabolic fashion, or decreased in stages.
  • the amount of the hydraulic oil supplied to the travel motor 20 may be increased gently.
  • the travelling shock may be prevented to thereby provide smooth travel.
  • FIG. 5 is a hydraulic circuit diagram illustrating a travel system for construction machinery.
  • FIG. 6 is a graph illustrating operating characteristics of a pressure reducing valve in FIG. 5 .
  • the hydraulic system for construction machinery may be substantially the same as or similar to the travel system for construction machinery as described with reference to FIG. 1 , except a pressure reducing valve 122.
  • same reference numerals will be used to refer to the same or like elements and any further repetitive explanation concerning the above elements will be omitted.
  • a travel system for construction machinery may include a hydraulic pump 10 to discharge a hydraulic oil, a travel motor 20 receiving the hydraulic oil to travel the construction machinery, a main control valve 30 configured to control the hydraulic oil supplied to the travel motor 20, a travel manipulation portion 40 to generate a pilot pressure for controlling an amount of the hydraulic oil discharged from the hydraulic pump 10 in response to a manipulation of a driver, and a travelling shock reducing device configured to reduce shock caused by driver's quick handling for travel.
  • the travelling shock reducing device may include a pressure sensor 100 configured to detect the pilot pressure generated by the travel manipulation portion 40, an angle sensor 110 configured to detect a manipulation amount of the manipulation portion 40, a controller 130 configured to receive information detected from the sensors 100, 110 and to generate a control signal for controlling the pilot pressure, and a pressure reducing valve 122 configured to control a magnitude of the pilot pressure according to the control signal.
  • the pressure reducing valve 122 may be installed in a pilot line 50, and may receive the control signal from the controller 130.
  • the pressure reducing valve 122 may control the magnitude of a second pilot pressure supplied to the hydraulic pump 10 corresponding the received control signal.
  • the pressure reducing valve may include electronic proportional pressure reducing (EPPR) valve.
  • the electronic proportional pressure reducing valve may generate a pilot pressure corresponding to the magnitude of the received control signal, for example, the magnitude of current. That is, the magnitude of the second pilot pressure may be determined according to the magnitude of the control signal received from the controller 130.
  • the pressure reducing valve 122 may control such that the magnitude of the second pilot pressure may be in proportion to the control signal received from the controller 130.
  • the magnitude of the second pilot pressure may be a third pressure P3 (point D).
  • the magnitude of the second pilot pressure may be a fourth pressure P4 (point E).
  • the fourth current C4 may be greater than the third current C3, and the fourth pressure P4 may be greater than the third pressure P3. That is, the greater the magnitude of the control signal inputted to the pressure reducing valve 122 is, the greater the magnitude of the second pilot pressure outputted through the second pilot line 54 is.
  • the travelling shock reducing device for construction machinery may control to gently increase the amount of the hydraulic oil supplied to the travel motor 20 even when the driver manipulates quickly the travel manipulation portion 40.
  • FIG. 7 is graphs illustrating changes in a pilot pressure and an input current.
  • the control method of FIG. 7 may be substantially the same as or similar to the control method for construction machinery as described with reference to FIGS. 3 and 4 , except changes in a second pilot pressure and an input current.
  • same reference numerals will be used to refer to the same or like elements and any further repetitive explanation concerning the above elements will be omitted.
  • the first and second pilot pressures may be zero, and the current inputted to the pressure reducing valve 122 may be a minimum value.
  • the first pilot pressure may be increased quickly corresponding to the manipulation amount of the travel manipulation portion 40.
  • the controller 130 may increase gently the current inputted to the pressure reducing valve 122.
  • the second pilot pressure may be increased gently.
  • the controller 130 may increase gently the magnitude of the current inputted to the pressure reducing valve 122.
  • the second pilot pressure may be increased gently until the second pilot pressure reaches the magnitude of the first pilot pressure (sixth zone, VI).
  • an increasing rate of the input current and an increasing rate of the second pilot pressure may be set in consideration of dimensions of the construction machinery, kinds of a selected change gear step, working conditions, etc.
  • the input current is increased in a linear fashion, however, it may not be limited thereto.
  • the input current may be increased in a parabolic fashion, or increased in stages.
  • the amount of the hydraulic oil supplied to the travel motor 20 may be increased gently.
  • the travelling shock may be prevented to thereby provide smooth travel.
  • FIG. 8 is a hydraulic circuit diagram illustrating a hydraulic system for construction machinery in accordance with example embodiments.
  • the hydraulic system for construction machinery may be substantially the same as or similar to the hydraulic system for construction machinery as described with reference to FIG. 1 , except a work manipulation portion and a shuttle valve.
  • same reference numerals will be used to refer to the same or like elements and any further repetitive explanation concerning the above elements will be omitted.
  • a hydraulic system for construction machinery may include a hydraulic pump 10 to discharge a hydraulic oil, a travel motor 20 receiving the hydraulic oil to travel the construction machinery, an actuator 22 receiving the hydraulic oil to drive a work apparatus of the construction machinery, a travel manipulation portion 40 and a wok manipulation portion 42 to generate a pilot pressure for controlling an amount of the hydraulic oil discharged from the hydraulic pump 10 in response to a manipulation of a driver, and a travelling shock reducing device configured to reduce shock caused by driver's quick operation of the travel manipulation portion 40.
  • the travel manipulation portion 40 may generate a first pilot pressure for controlling an amount of the hydraulic oil supplied to the travel motor 20.
  • the travel manipulation portion 40 may include a travel pedal.
  • the travel manipulation portion 40 may generate a third pilot pressure for controlling an amount of the hydraulic oil supplied to the actuator 22 for driving the work apparatus.
  • the work manipulation portion 42 may include a joystick.
  • the actuator 22 may include a swing motor, a boom cylinder, an arm cylinder, a bucket cylinder, etc.
  • the first pilot pressure generated from the travel manipulation portion 40 may be supplied to the hydraulic pump 10 through a pilot line 50.
  • the third pilot pressure generated from the work manipulation portion 42 may be supplied to the hydraulic pump 10 through a third pilot line 60.
  • the hydraulic system according to the invention further includes a shuttle valve 150 which selects and outputs a higher pressure of two pressures inputted through an outlet portion. First and second end portions of an inlet of the shuttle valve may be connected to the pilot line 50 and the third pilot line 60 respectively.
  • the pilot line 50 may include a first pilot line 52 and a second pilot line 54.
  • the first pilot line 52 may connect the travel manipulation portion 40 and a pressure reducing valve 120
  • the second pilot line 54 may connect the pressure reducing valve 120 and the first end portion of the inlet of the shuttle valve 150.
  • the third pilot line 60 may connect the work manipulation portion 42 and the second end portion of the inlet of the shuttle valve 150.
  • a fourth pilot line 70 may connect the outlet of the shuttle valve 150 and a regulator 140.
  • the shuttle valve 150 may select a higher pressure of a second pilot pressure adjusted by the pressure reducing valve 120 and the third pilot pressure generated by the work manipulation portion 42 and output to a regulator 140.

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  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Claims (11)

  1. Système hydraulique pour machine de construction du type à roues, comprenant :
    une pompe hydraulique (10) ;
    un moteur de déplacement (20) conçu pour recevoir une huile hydraulique refoulée par la pompe hydraulique (10) afin de déplacer la machine de construction ;
    un actionneur (22) conçu pour recevoir l'huile hydraulique en provenance de la pompe hydraulique (10) afin d'entraîner un appareil de travail de la machine de construction ;
    une partie de manœuvre de déplacement (40) conçue pour engendrer une première pression de pilotage permettant de commander une quantité de l'huile hydraulique refoulée par la pompe hydraulique (10) pour être fournie au moteur de déplacement (20), dans lequel la première pression de pilotage engendrée à partir de la partie de manœuvre de déplacement (40) est fournie à la pompe hydraulique (10) par l'intermédiaire d'une canalisation de pilotage (50) ;
    une partie de manœuvre de travail (42) comprenant un levier de commande et étant conçue pour engendrer une troisième pression de pilotage pour commander une quantité de l'huile à hydraulique à fournir à l'actionneur (22), dans lequel la troisième pression de pilotage est fournie à la pompe hydraulique (10) par l'intermédiaire d'une troisième canalisation de pilotage (60) ;
    une partie de détection conçue pour détecter une variation de manœuvre de la partie de manœuvre de déplacement ;
    un réducteur de pression (120) installé entre la partie de manœuvre de déplacement (40) et la pompe hydraulique (10) pour commander la première pression de pilotage fournie à la pompe hydraulique (10) ;
    un dispositif de commande (130) recevant des informations sur la variation de manœuvre en provenance de la partie de détection, et étant conçu pour commander un actionnement du réducteur de pression (120) de manière que la première pression de pilotage augmente doucement lorsque la variation de manœuvre de la partie de manœuvre de déplacement (40) est supérieure à une valeur prédéterminée ; et
    une vanne sélecteur de circuit (150) raccordée à la canalisation de pilotage (50) et à la troisième canalisation de pilotage (60), respectivement, et conçue pour sélectionner et délivrer la plus élevée entre la première pression de pilotage commandée par le réducteur de pression (120) et la troisième pression de pilotage,
    dans lequel le réducteur de pression (120) est installé sur la canalisation de pilotage (50) qui relie la partie de manœuvre de déplacement (40) et la vanne sélecteur de circuit (120).
  2. Système hydraulique pour machine de construction du type à roues, selon la revendication 1, dans lequel, lorsqu'une grandeur de la pompe de pilotage, engendrée par la partie de manœuvre de déplacement (40), augmente dans un premier rapport, une grandeur de la pompe de pilotage, fournie par le réducteur de pression (120) à la pompe hydraulique (10), augmente dans un second rapport inférieur au premier rapport.
  3. Système hydraulique pour machine de construction du type à roues, selon la revendication 1, dans lequel la partie de manœuvre de déplacement (40) inclut une pédale de déplacement.
  4. Système hydraulique pour machine de construction du type à roues, selon la revendication 3, comprenant en outre un capteur d'angle, conçu pour détecter une variation d'angle de la pédale de déplacement.
  5. Système hydraulique pour machine de construction du type à roues, selon la revendication 4, dans lequel la partie de détection inclut un capteur de pression (100) conçu pour détecter une variation de la première pression de pilotage.
  6. Système hydraulique pour machine de construction du type à roues, selon la revendication 5, dans lequel le capteur de pression (100) inclut un pressostat.
  7. Système hydraulique pour machine de construction du type à roues, selon la revendication 1, dans lequel le réducteur de pression (120) inclut un réducteur de pression proportionnel électronique (EPPR, electronic proportional pressure reducing valve).
  8. Système hydraulique pour machine de construction du type à roues, selon la revendication 7, dans lequel le réducteur de pression (120) agit de manière qu'une grandeur de seconde pression de pilotage ajustée par le réducteur de pression (120) soit proportionnelle à un signal de commande reçu en provenance du dispositif de commande (130).
  9. Système hydraulique pour machine de construction du type à roues, selon la revendication 7, dans lequel le réducteur de pression (120) agit de manière qu'une grandeur de seconde pression de pilotage ajustée par le réducteur de pression (120) soit inversement proportionnelle à un signal de commande reçu en provenance du dispositif de commande (130).
  10. Système hydraulique pour machine de construction du type à roues, selon la revendication 1, comprenant en outre un régulateur installé entre le réducteur de pression (120) et la pompe hydraulique (10).
  11. Système hydraulique pour machine de construction, selon la revendication 1, dans lequel la pompe hydraulique (10) est une pompe hydraulique à cylindrée variable (10).
EP16876075.9A 2015-12-16 2016-12-16 Dispositif pour réduire l'impact durant le déplacement d'une machine de construction Active EP3382108B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20150179946 2015-12-16
PCT/KR2016/014805 WO2017105133A1 (fr) 2015-12-16 2016-12-16 Dispositif pour réduire l'impact durant le déplacement d'une machine de construction et procédé pour commander une machine de construction en utilisant ledit dispositif

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EP3382108A1 EP3382108A1 (fr) 2018-10-03
EP3382108A4 EP3382108A4 (fr) 2019-07-24
EP3382108B1 true EP3382108B1 (fr) 2020-12-02

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JPH08135789A (ja) * 1994-11-09 1996-05-31 Komatsu Ltd 車両の油圧式駆動装置の変速装置およびその変速制御方法
JPH09264423A (ja) * 1996-03-28 1997-10-07 Mitsubishi Agricult Mach Co Ltd 走行車輌の静油圧駆動変速装置
JP3533085B2 (ja) * 1998-04-23 2004-05-31 コベルコ建機株式会社 建設機械のポンプ制御装置
KR100974279B1 (ko) * 2008-03-27 2010-08-06 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 중장비의 주행시스템
JP2011001970A (ja) * 2009-06-16 2011-01-06 Hitachi Constr Mach Co Ltd 建設機械の走行制御装置
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KR101975062B1 (ko) * 2011-12-27 2019-05-03 두산인프라코어 주식회사 건설기계의 유압시스템
KR20130084071A (ko) * 2012-01-16 2013-07-24 볼보 컨스트럭션 이큅먼트 에이비 건설기계의 주행 제어시스템 및 그 제어방법
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Publication number Publication date
CN108368693A (zh) 2018-08-03
EP3382108A1 (fr) 2018-10-03
WO2017105133A1 (fr) 2017-06-22
KR20180079447A (ko) 2018-07-10
KR102121879B1 (ko) 2020-06-11
EP3382108A4 (fr) 2019-07-24
CN108368693B (zh) 2020-09-08

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