US20150354174A1 - Method for controlling driving speed of construction machinery - Google Patents

Method for controlling driving speed of construction machinery Download PDF

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Publication number
US20150354174A1
US20150354174A1 US14/762,315 US201314762315A US2015354174A1 US 20150354174 A1 US20150354174 A1 US 20150354174A1 US 201314762315 A US201314762315 A US 201314762315A US 2015354174 A1 US2015354174 A1 US 2015354174A1
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US
United States
Prior art keywords
traveling
traveling speed
swing
hydraulic fluid
driving
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.)
Abandoned
Application number
US14/762,315
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English (en)
Inventor
Chun-Han Lee
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.)
Volvo Construction Equipment AB
Original Assignee
Volvo Construction Equipment AB
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.)
Filing date
Publication date
Application filed by Volvo Construction Equipment AB filed Critical Volvo Construction Equipment AB
Assigned to VOLVO CONSTRUCTION EQUIPMENT AB reassignment VOLVO CONSTRUCTION EQUIPMENT AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LEE, CHUN-HAN
Publication of US20150354174A1 publication Critical patent/US20150354174A1/en
Abandoned legal-status Critical Current

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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
    • E02F9/2253—Controlling the travelling speed of vehicles, e.g. adjusting travelling speed according to implement loads, control of hydrostatic transmission
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/45—Nc applications
    • G05B2219/45012—Excavator

Definitions

  • the present invention relates to a traveling speed control method for a construction machinery. More particularly, the present invention relates to such a traveling speed control method for a construction machine in which when a combined operation is performed in which the working apparatus is manipulated during the separate traveling of the machine, a sudden change in the traveling speed is prevented.
  • FIG. 1 is a graph showing a discharge flow rate of hydraulic fluid discharged from a hydraulic pump when a working apparatus is manipulated during the traveling operation of the construction machine in accordance with the prior art.
  • an excavator performs an excavation operation and the like by manipulating left and right traveling apparatuses and a working apparatus including a boom and the like.
  • a maximum flow rate of hydraulic fluid is discharged from the hydraulic pump, thereby increasing the working speed.
  • a maximum flow rate of hydraulic fluid (indicated by a curve “a” in a graph of FIG. 1 ) discharged from the hydraulic pump is dispensively supplied to the traveling apparatus (indicated by a curve “c” in a graph of FIG. 1 ) or the working apparatus (indicated by a curve “d” in a graph of FIG. 1 ), thus leading to a remarkable decrease in the traveling speed.
  • the present invention has been made to solve the aforementioned problems occurring in the prior art, and it is an object of the present invention to provide a traveling speed control method for a construction machine, in which a separate maximum traveling speed of a traveling apparatus is set to a low speed so that when the working apparatus is manipulated during the traveling operation of the construction machine, a sudden change in the traveling speed can be prevented.
  • a traveling speed control method for a construction machine including a lower traveling structure, a swing apparatus configured to swing an upper swing structure with respect to the lower traveling structure, a traveling apparatus, a working apparatus, an electronic proportional valve configured to control a discharge flow rate of hydraulic fluid discharged from a hydraulic pump, and a controller, the traveling speed control method including:
  • a third step of decreasing the required flow rate of hydraulic fluid of the traveling apparatus which is calculated in the second step in accordance with a ratio set by an operator so that a separate maximum traveling speed of the traveling apparatus can be decreased by an operator's setting;
  • a determination means may determine whether the traveling apparatus, the working apparatus, and the swing apparatus are manipulated based on an electrical signal value that is output by the manipulation of an electric joystick or a secondary pressure value that is output by the manipulation of a hydraulic joystick.
  • any one of an on/off function switch, a potentiometer, a display device, and a cluster, which are installed in a cabin of the machine, may be used as a setting means capable of reducing the separate maximum traveling speed of the traveling apparatus by the operator's setting.
  • the traveling speed control method for a construction machine in accordance with an embodiment of the present invention as constructed above has the following advantages.
  • the separate maximum traveling speed of the traveling apparatus is set to a low speed so that when the working apparatus is manipulated during the traveling operation of the construction machine, a traveling shock due to a sudden change in the traveling speed can be decreased, thereby reducing an operator's fatigue and improving workability.
  • the traveling speed of traveling apparatus is set to a low speed while maintaining the driving speed of the working apparatus so that the engine's RPM need not to be adjusted to be lowered in order to reduce the traveling speed of the traveling apparatus.
  • FIG. 1 is a graph showing a discharge flow rate of hydraulic fluid discharged from a hydraulic pump when a working apparatus is manipulated during the traveling operation of the construction machine in accordance with the prior art
  • FIG. 2 is a block diagram showing a configuration of a hydraulic system used in a traveling speed control method for a construction machine in accordance with a preferred embodiment of the present invention
  • FIG. 3 is a flow chart showing a traveling speed control method for a construction machine in accordance with a preferred embodiment of the present invention.
  • FIG. 4 is a graph showing a discharge flow rate of hydraulic fluid discharged from a hydraulic pump when a working apparatus is manipulated during the traveling operation of a construction machine in a traveling speed control method for the construction machine in accordance with a preferred embodiment of the present invention.
  • FIG. 2 is a block diagram showing a configuration of a hydraulic system used in a traveling speed control method for a construction machine in accordance with a preferred embodiment of the present invention
  • FIG. 3 is a flow chart showing a traveling speed control method for a construction machine in accordance with a preferred embodiment of the present invention
  • FIG. 4 is a graph showing a discharge flow rate of hydraulic fluid discharged from a hydraulic pump when a working apparatus is manipulated during the traveling operation of a construction machine in a traveling speed control method for the construction machine in accordance with a preferred embodiment of the present invention.
  • the present invention provides a traveling speed control method for a construction machine including a lower traveling structure, an upper swing structure mounted on the lower traveling structure so as to be swingable by a swing apparatus; a traveling apparatus mounted on the lower traveling structure, a working apparatus including a boom, an arm and a bucket, an electronic proportional valve configured to control a discharge flow rate of hydraulic fluid discharged from a hydraulic pump connected to an engine, and a controller.
  • the traveling speed control method includes:
  • a first step (S 10 , S 10 A) of outputting a manipulation signal corresponding to a manipulation amount of each of a hydraulic pedal 10 and hydraulic joysticks 20 and 30 upon the manipulation of the hydraulic pedal 10 and the hydraulic joysticks 20 and 30 to drive the traveling apparatus, the working apparatus, and the swing apparatus;
  • a determination means can determine whether the traveling apparatus, the working apparatus, and the swing apparatus are manipulated based on a secondary pressure value that is output to the controller 40 by the manipulation of the hydraulic pedal 10 and the hydraulic joysticks 20 and 30 .
  • the determination means can determine whether the traveling apparatus, the working apparatus, and the swing apparatus are manipulated based on an electrical signal value that is output to the controller 40 by the manipulation of the hydraulic pedal 10 and the hydraulic joysticks 20 and 30 .
  • Any one of an on/off function switch, a potentiometer, a display device, and a cluster 60 , which are installed in a cabin of the machine can be used as a setting means capable of reducing the separate maximum traveling speed of the traveling apparatus by the operator's setting.
  • step S 10 when the hydraulic pedal 10 is manipulated by the operator to allow an excavator to travel by an operator, a manipulation signal corresponding to a manipulation amount of the hydraulic pedal 10 is output to the controller 40 .
  • step S 10 A when the hydraulic joystick (e.g., RCV lever) 20 or 30 is manipulated by the operator so that the working apparatus or the swing apparatus can be driven, a manipulation signal (i.e., a secondary pressure value) corresponding to a manipulation amount of the hydraulic joystick 20 or 30 is output to the controller 40 .
  • a manipulation signal i.e., a secondary pressure value
  • step S 20 the controller 40 calculates a required flow rate of hydraulic fluid, which corresponds to the manipulation amount of the hydraulic pedal 10 .
  • step S 20 A the controller 40 respectively calculates the required flow rates of hydraulic fluid, which correspond to the manipulation amounts of the hydraulic joysticks 20 and 30 .
  • step S 30 the controller 40 decreasingly re-calculates the required flow rate of hydraulic fluid of the traveling apparatus, which is calculated in the second step S 20 in accordance with a ratio (for example, the ratio can be set by the operator to decrease the maximum traveling speed to 20%, 30%, 50%, etc.) set by an operator so that the separate maximum traveling speed of the traveling apparatus can be decreased by an operator's setting.
  • a ratio for example, the ratio can be set by the operator to decrease the maximum traveling speed to 20%, 30%, 50%, etc.
  • any one of an on/off function switch, a potentiometer, a display device, and a cluster 60 which are installed in the cabin of the machine so as to be manipulated by the operator may be used as a setting means capable of reducing the separate maximum traveling speed of the traveling apparatus by the operator's setting.
  • a speed decreasing ratio is previously set in the cluster 60 so that the separate maximum traveling speed of the traveling apparatus can be decreased by the operator.
  • the operator can select the speed decreasing ratio previously set in the cluster 60 to reduce the traveling speed
  • step S 40 controller 40 outputs an electrical control signal to the electronic proportional valve 50 so that the required flow rates of hydraulic fluid (i.e., the required flow rate of hydraulic fluid of the working apparatus and the reduced flow rate of hydraulic fluid of the traveling apparatus), which are calculated in the second and third steps S 20 A and S 30 , are combined and the combined flow rates of the hydraulic fluid is discharged from the hydraulic pump.
  • a regulator of the hydraulic pump is driven by a secondary pressure generated to correspond to the electrical control signal that is input to the electronic proportional valve 50 so as to variably control a swivel angle of a swash plate of the hydraulic pump so that the discharge flow rate of hydraulic fluid from the hydraulic pump can be controlled.
  • the separate maximum traveling speed of the traveling apparatus is decreased by the operator's setting so that the maximum traveling speed can be reduced even during the separate traveling of the machine.
  • a sudden reduction in the traveling speed is prevented (see a curve “f” in a graph of FIG. 4 ) so that the occurrence of a traveling shock can be decreased, workability can be improved, and the operator's fatigue can be reduced.
  • the separate maximum traveling speed is decreased by the operator's setting so that the discharge flow rate of hydraulic fluid discharged from the hydraulic pump can be reduced at an initial stage of the traveling operation (see a curve “d” in a graph of FIG.
  • traveling speed of the traveling apparatus is set to be decreased while constantly maintaining the driving speed of the working apparatus (see a curve “e” in a graph of FIG. 4 ) so that the traveling speed of traveling apparatus is set to a low speed while maintaining the driving speed of the working apparatus so that the engine's RPM need not to be adjusted to be lowered in order to reduce the traveling speed of the traveling apparatus.
  • the separate maximum traveling speed of the traveling apparatus is set to a low speed so that when the working apparatus is manipulated during the traveling operation of the construction machine, a sudden change in the traveling speed can be prevented.

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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)
US14/762,315 2013-01-23 2013-01-23 Method for controlling driving speed of construction machinery Abandoned US20150354174A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2013/000532 WO2014115905A1 (ko) 2013-01-23 2013-01-23 건설기계의 주행속도 제어방법

Publications (1)

Publication Number Publication Date
US20150354174A1 true US20150354174A1 (en) 2015-12-10

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US14/762,315 Abandoned US20150354174A1 (en) 2013-01-23 2013-01-23 Method for controlling driving speed of construction machinery

Country Status (5)

Country Link
US (1) US20150354174A1 (zh)
EP (1) EP2949820A1 (zh)
KR (1) KR20150105961A (zh)
CN (1) CN104937179A (zh)
WO (1) WO2014115905A1 (zh)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150308078A1 (en) * 2012-12-13 2015-10-29 Hyundai Heavy Industries Co., Ltd. Automatic control system and method for joystick control-based construction equipment
US20150322648A1 (en) * 2013-01-24 2015-11-12 Volvo Construction Equipment Ab Device and method for controlling flow rate in construction machinery
US20150361641A1 (en) * 2013-02-06 2015-12-17 Volvo Construction Equipment Ab Swing control system for construction machines

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102471489B1 (ko) 2015-07-15 2022-11-28 현대두산인프라코어(주) 건설기계 및 건설기계의 제어 방법
GB2549150B (en) * 2016-04-08 2019-10-09 Caterpillar Inc Control system and method for a machine
CN107747331B (zh) * 2017-05-03 2021-01-12 柳州柳工挖掘机有限公司 履带式挖掘机自动手动行走液压电气系统
EP3724409A4 (en) * 2017-12-14 2022-01-12 Volvo Construction Equipment AB HYDRAULIC MACHINE

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100621985B1 (ko) * 2005-08-02 2006-09-11 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 주행시스템
KR20090103082A (ko) * 2008-03-27 2009-10-01 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 중장비의 주행시스템

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100493358B1 (ko) * 1997-12-30 2005-08-17 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 중장비용 주행장치
EP1801396B1 (en) * 2004-09-27 2013-12-04 Hitachi Construction Machinery Co., Ltd Engine control device for working vehicle
KR100611714B1 (ko) * 2005-02-17 2006-08-11 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 중장비의 전후진 급변경시 충격을 완화하는 제어장치 및 제어방법

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100621985B1 (ko) * 2005-08-02 2006-09-11 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 주행시스템
KR20090103082A (ko) * 2008-03-27 2009-10-01 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 중장비의 주행시스템

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150308078A1 (en) * 2012-12-13 2015-10-29 Hyundai Heavy Industries Co., Ltd. Automatic control system and method for joystick control-based construction equipment
US9739036B2 (en) * 2012-12-13 2017-08-22 Hyundai Construction Equipment Co., Ltd. Automatic control system and method for joystick control-based construction equipment
US20150322648A1 (en) * 2013-01-24 2015-11-12 Volvo Construction Equipment Ab Device and method for controlling flow rate in construction machinery
US9725882B2 (en) * 2013-01-24 2017-08-08 Volvo Construction Equipment Ab Device and method for controlling flow rate in construction machinery
US20150361641A1 (en) * 2013-02-06 2015-12-17 Volvo Construction Equipment Ab Swing control system for construction machines
US9540789B2 (en) * 2013-02-06 2017-01-10 Volvo Construction Equipment Ab Swing control system for construction machines

Also Published As

Publication number Publication date
EP2949820A1 (en) 2015-12-02
CN104937179A (zh) 2015-09-23
WO2014115905A1 (ko) 2014-07-31
KR20150105961A (ko) 2015-09-18

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Legal Events

Date Code Title Description
AS Assignment

Owner name: VOLVO CONSTRUCTION EQUIPMENT AB, SWEDEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LEE, CHUN-HAN;REEL/FRAME:036143/0406

Effective date: 20150721

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION