EP2657492A2 - Système de commande de faible ralenti d'équipement de construction et son procédé de commande automatique - Google Patents

Système de commande de faible ralenti d'équipement de construction et son procédé de commande automatique Download PDF

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Publication number
EP2657492A2
EP2657492A2 EP11850744.1A EP11850744A EP2657492A2 EP 2657492 A2 EP2657492 A2 EP 2657492A2 EP 11850744 A EP11850744 A EP 11850744A EP 2657492 A2 EP2657492 A2 EP 2657492A2
Authority
EP
European Patent Office
Prior art keywords
sensor
angle
sensing means
steering
construction equipment
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.)
Granted
Application number
EP11850744.1A
Other languages
German (de)
English (en)
Other versions
EP2657492B1 (fr
EP2657492A4 (fr
Inventor
Kwang Seok Park
Sung Il Kim
Hee Jun Jeong
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.)
Hyundai Doosan 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.)
Filing date
Publication date
Application filed by Doosan Infracore Co Ltd filed Critical Doosan Infracore Co Ltd
Publication of EP2657492A2 publication Critical patent/EP2657492A2/fr
Publication of EP2657492A4 publication Critical patent/EP2657492A4/fr
Application granted granted Critical
Publication of EP2657492B1 publication Critical patent/EP2657492B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/08—Introducing corrections for particular operating conditions for idling
    • F02D41/083—Introducing corrections for particular operating conditions for idling taking into account engine load variation, e.g. air-conditionning
    • 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
    • E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
    • E02F9/2062—Control of propulsion units
    • E02F9/2066—Control of propulsion units of the type combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00

Definitions

  • the present invention relates to a low idle control system of construction equipment and an automatic control method thereof, and more particularly, to a low idle control system of construction equipment and an automatic control method thereof, capable of implementing an effective auto idle function by accurately recognizing a state of using equipment.
  • the excavators perform various operations such as operations of excavating, leveling the ground, compacting the ground, lifting heavy objects, and the like.
  • the excavator has a working device including a boom, an arm, and a bucket, and work of the excavator is performed by controlling the working device including the boom, the arm, and the bucket by operating each corresponding actuator (or a hydraulic cylinder).
  • the wheel loader refers to equipment that is used to perform civil work at construction sites, and is widely used to perform operations of conveying powder materials such as soil, sand, or the like, loading or unloading conveyed soil and sand onto or from freight vehicles, leveling ground for road, removing snow, towing vehicles, and the like.
  • a technology of converting a state of an engine into an idle state so as to improve fuel efficiency is generally applied in a case in which pressure of working oil in an accelerator pedal, a steering part, and a front unit is not varied for a predetermined time.
  • This function is typically referred to as an 'auto idle function'.
  • a no-load operation for example, a bucket dump, a boom floating that the boom is lowered by its own weight, or the like, may occur during performing work.
  • a variation in pressure of the front unit is very small when the no-load operations are performed, it may be recognized that the equipment does not work. Accordingly, a case occurs in which the equipment enters the aforementioned auto idle state, or the auto idle state, which is already in progress, is continued.
  • the aforementioned no-load operation is frequently converted directly into a load operation, and in this case, because the auto idle state needs to be suddenly released, there is a problem in that the engine is stopped (engine stall), or an increase in output of the engine is delayed.
  • the present invention has been made in an effort to solve the aforementioned problem, and an object of the present invention is to provide a low idle control system of construction equipment and an automatic control method thereof, capable of implementing an effective auto idle function by more accurately recognizing a state of using equipment.
  • the present invention provides a low idle control system of construction equipment, including: a front angle change sensing means which detects an operation of at least a part of a front unit through changes in an angle; a controller which is electrically connected to the front angle change sensing means, determines whether to enter an auto idle state by receiving an output signal that is transmitted from the front angle change sensing means, and generates an rpm control signal corresponding to the result of the determination on whether to enter the auto idle state; and an ECU which controls the rpm of an engine by receiving the rpm control signal outputted from the controller.
  • the present invention further provides the following specific exemplary embodiments.
  • the front angle change sensing means may include at least one of a boom angle sensor which is installed at an upper turning unit and detects a change in an angle of a boom, an arm angle sensor which is installed at the boom and detects a change in an angle of an arm, and a bucket angle sensor which is installed at the arm and detects a change in an angle of a bucket.
  • the low idle control system of construction equipment may further include: an accelerator pedal sensor which detects operating pressure of an accelerator pedal or a change in angle of the accelerator pedal; and a steering sensor which detects a change in angle or operating pressure of a steering wheel or a steering joystick, in which the controller may additionally consider signals outputted from the accelerator pedal sensor and the steering sensor, at the time of determining whether to enter the auto idle state.
  • the low idle control system of construction equipment may further include: a working oil pressure sensor which detects pilot pressure that is generated corresponding to pressure of working oil supplied to drive a working device of the front unit, or an operation of an operating lever for operating the front unit, in which the controller may additionally consider a signal outputted from the working oil pressure sensor, at the time of determining whether to enter the auto idle state.
  • the present invention provides an automatic control method of a low idle control system of construction equipment, including: monitoring output signals that are received from a steering sensor, an accelerator pedal sensor, and a front angle change sensing means (S20); determining whether a preset output signal corresponding to a steering pressure reference value or less from the steering sensor, an off signal from the accelerator pedal sensor, and an off signal from the front angle change sensing means are continued for a predetermined time or more (S22); entering an auto idle mode by recognizing that the equipment does not work when it is determined that the condition is continued for a predetermined time or more according to the determination result of step S22 (S24); and outputting normal rpm by inputting a preset control signal into the ECU, which controls the engine, when it is determined that the condition is not satisfied according to the determination result of step S22 (S22a).
  • the present invention further provides the following specific exemplary embodiments.
  • the automatic control method of a low idle control system of construction equipment may further include: determining, after step S24, whether at least one of a preset output signal corresponding to a steering pressure reference value or more from the steering sensor, an operating signal from the accelerator pedal sensor, and an operating signal from the front angle change sensing means is received (S26), in which when it is determined that at least a signal of the signals is received according to the determination result, a preset control signal is inputted into the ECU, which controls the engine, and normal rpm is outputted (S22a).
  • the present invention additionally provides an angle change sensing means, which may detect an operation of a front unit through changes of the angle of the front unit, in addition to the existing partial input elements (a steering sensor and an accelerator pedal sensor) that are used to determine a state of using equipment, and an ECU may be controlled by a controller using signals of the aforementioned components, thereby implementing an effective auto idle function by more accurately recognizing a state of using the equipment.
  • an angle change sensing means may detect an operation of a front unit through changes of the angle of the front unit, in addition to the existing partial input elements (a steering sensor and an accelerator pedal sensor) that are used to determine a state of using equipment, and an ECU may be controlled by a controller using signals of the aforementioned components, thereby implementing an effective auto idle function by more accurately recognizing a state of using the equipment.
  • FIGS. 1 and 2 an exemplary embodiment of an automatic control method of a low idle control system of construction equipment according to the present invention will be described with reference to FIGS. 1 and 2 .
  • a low idle control system of construction equipment includes a front angle change sensing means 10, a controller 3, and an ECU 4.
  • the front angle change sensing means 10 detects an operation of at least a part of a front unit (for example, a working device) through changes in an angle.
  • the controller 3 is electrically connected to the front angle change sensing means 10.
  • the controller 3 determines whether to enter an auto idle state by receiving an output signal that is transmitted from the front angle change sensing means 10, and generates an rpm control signal corresponding to the result of the determination on whether to enter the auto idle state.
  • the ECU 4 controls the rpm of an engine 5 by receiving the rpm control signal outputted from the controller 3.
  • a low idle control system of construction equipment further includes a steering sensor 1, and an accelerator pedal sensor 2.
  • the steering sensor 1 detects an operation of a steering wheel or a steering joystick through changes in pressure or an angle
  • the accelerator pedal sensor 2 detects an operation of an accelerator pedal through changes in pressure or an angle.
  • a working oil pressure sensor 9 which measures pilot pressure that is generated corresponding to pressure of working oil supplied to drive a drive unit of the existing steering device and the existing front working device, or an operation of an operating lever, may be used.
  • the controller 3 first confirms whether to enter an auto idle mode on the basis of an inputted signal from the working oil pressure sensor 9, and then may determine whether to enter/release the auto idle mode according to the detection result of the front angle change sensing means 10.
  • the problem of the related art may be solved only by additionally installing the front angle change sensing means 10, which may be comparatively easily installed in the front working device, in the existing equipment, and correcting a control method as described above.
  • the controller 3 is electrically connected to the steering sensor 1 and the accelerator pedal sensor 2, or the working oil pressure sensor 9, respectively. Accordingly, the controller 3 may additionally consider signals outputted from the accelerator pedal sensor 2 and the steering sensor 1, or a signal outputted from the working oil pressure sensor 9, at the time of determining whether to enter the auto idle mode.
  • the ECU 4 may control the rpm of the engine 5 by receiving the rpm control signal corresponding to output signals from the steering sensor 1, the accelerator pedal sensor 2, and the front angle change sensing means 10 in the controller 3.
  • the front angle change sensing means 10 may be configured by at least one of a boom angle sensor 11 which is installed at an upper turning unit and detects a change in an angle of a boom, an arm angle sensor 12 which is installed at the boom and detects a change in an angle of an arm, and a bucket angle sensor 13 which is installed at the arm and detects a change in an angle of a bucket.
  • the front angle change sensing means 10 may implement a function of entering/releasing the auto idle state corresponding to most operations except for traveling/turning operations.
  • all of the steering sensor 1, the accelerator pedal sensor 2, the working oil pressure sensor 9, and the front angle change sensing means 10, which are described above, may be installed.
  • the controller 3 monitors output signals that are received from the steering sensor 1, the accelerator pedal sensor 2, and the front angle change sensing means 10 (S20).
  • step S24 when it is determined that the aforementioned condition is continued for a predetermined time (for example, 5 seconds) or more according to the determination result of step S22, it is recognized that the equipment does not work, and then the equipment enters the auto idle mode (S24).
  • a predetermined time for example, 5 seconds
  • step S22 when it is determined that the aforementioned condition is not satisfied according to the determination result of step S22, a preset control signal is inputted into the ECU 4, which controls the engine 5, and normal rpm is outputted (S22a).
  • step S24 it is determined whether at least one of a preset output signal corresponding to a steering pressure reference value or more from the steering sensor 1, an operating signal from the accelerator pedal sensor 2, and an operating signal from the front angle change sensing means 10 is received (S26).
  • step S26 When it is determined that at least a signal of the aforementioned signals is received according to the determination result of step S26, a preset control signal is inputted into the ECU 4, which controls the engine 5, and normal rpm is outputted (S22a).
  • the present invention additionally provides an angle change sensing means, which may detect an operation of a front unit through changes in the angle of the front unit, in addition to the existing partial input elements (a steering sensor, an accelerator pedal sensor, and a working oil pressure sensor) that are used to determine a state of using equipment, and an ECU may be controlled by a controller using signals of the aforementioned components, thereby implementing an effective auto idle function by more accurately recognizing a state of using the equipment.
  • an angle change sensing means may detect an operation of a front unit through changes in the angle of the front unit, in addition to the existing partial input elements (a steering sensor, an accelerator pedal sensor, and a working oil pressure sensor) that are used to determine a state of using equipment, and an ECU may be controlled by a controller using signals of the aforementioned components, thereby implementing an effective auto idle function by more accurately recognizing a state of using the equipment.
EP11850744.1A 2010-12-21 2011-12-21 Système de commande de faible ralenti d'équipement de construction et son procédé de commande automatique Active EP2657492B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020100131189A KR101685206B1 (ko) 2010-12-21 2010-12-21 건설장비의 로우아이들 제어 시스템 및 그 자동 제어방법
PCT/KR2011/009920 WO2012087020A2 (fr) 2010-12-21 2011-12-21 Système de commande de faible ralenti d'équipement de construction et son procédé de commande automatique

Publications (3)

Publication Number Publication Date
EP2657492A2 true EP2657492A2 (fr) 2013-10-30
EP2657492A4 EP2657492A4 (fr) 2017-06-28
EP2657492B1 EP2657492B1 (fr) 2019-08-14

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EP11850744.1A Active EP2657492B1 (fr) 2010-12-21 2011-12-21 Système de commande de faible ralenti d'équipement de construction et son procédé de commande automatique

Country Status (5)

Country Link
US (1) US20130289834A1 (fr)
EP (1) EP2657492B1 (fr)
KR (1) KR101685206B1 (fr)
CN (1) CN103261643B (fr)
WO (1) WO2012087020A2 (fr)

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CN103422528B (zh) * 2013-08-24 2015-04-01 烟台兴业机械股份有限公司 一种地下铲运机的智能控制系统
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Also Published As

Publication number Publication date
WO2012087020A3 (fr) 2012-09-07
CN103261643A (zh) 2013-08-21
CN103261643B (zh) 2017-02-15
US20130289834A1 (en) 2013-10-31
EP2657492B1 (fr) 2019-08-14
EP2657492A4 (fr) 2017-06-28
WO2012087020A2 (fr) 2012-06-28
KR101685206B1 (ko) 2016-12-12
KR20120069868A (ko) 2012-06-29

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