JP2005155251A - Power system control unit for construction machine - Google Patents

Power system control unit for construction machine Download PDF

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Publication number
JP2005155251A
JP2005155251A JP2003397807A JP2003397807A JP2005155251A JP 2005155251 A JP2005155251 A JP 2005155251A JP 2003397807 A JP2003397807 A JP 2003397807A JP 2003397807 A JP2003397807 A JP 2003397807A JP 2005155251 A JP2005155251 A JP 2005155251A
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JP
Japan
Prior art keywords
engine
generator
torque
electric motor
motor
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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.)
Pending
Application number
JP2003397807A
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Japanese (ja)
Inventor
Hiroshi Ishiyama
寛 石山
Original Assignee
Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd
住友建機製造株式会社
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
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Application filed by Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd, 住友建機製造株式会社 filed Critical Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd
Priority to JP2003397807A priority Critical patent/JP2005155251A/en
Publication of JP2005155251A publication Critical patent/JP2005155251A/en
Application status is Pending legal-status Critical

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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/62Hybrid vehicles
    • Y02T10/6213Hybrid vehicles using ICE and electric energy storage, i.e. battery, capacitor
    • Y02T10/6221Hybrid vehicles using ICE and electric energy storage, i.e. battery, capacitor of the parallel type
    • Y02T10/6226Motor-assist type

Abstract

<P>PROBLEM TO BE SOLVED: To reduce size and weight; to reduce costs; and to obtain a high power. <P>SOLUTION: This power system control unit for construction machines comprises: one electric motor/generator 22 which can selectively perform an operation of an electric motor driven to rotate by an engine 21 so as to convert mechanical energy of rotation into electrical energy and supply it to a battery 25, and an operation of an electric motor for assisting torque, which converts the electrical energy, received from the battery 25, into mechanical energy so as to supply it to a hydraulic pump 23; and a control means 24 which detects load fluctuations of the engine 21 so as to perform switching between the operations of the electric motor/generator 22. In the power system control unit, the switching in the control means 24 makes the electric motor/generator 22 operate as the electric motor for assisting the torque of the engine 21 in the heavy-load operation of the engine, and makes the electric motor/generator 22 operate the generator by the surplus torque of the engine 21 in the light-load operation of the engine 21. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a power system controller for a construction machine such as a hydraulic excavator, and more particularly, to a hybrid construction machine including a generator and a torque assisting motor in addition to an engine as a power source for driving the construction machine. The present invention relates to a power system control device.

  In general, a hydraulic excavator is equipped with a diesel engine as a drive source, travels with the diesel engine, and drives a hydraulic pump to operate an arm, an excavator, and the like to perform various operations. This method has a problem in terms of exhaust gas, such as exhausting black smoke, which is heavy on the engine, and also in terms of noise and fuel efficiency.

  Therefore, for the purpose of reducing the burden on the engine and improving the fuel efficiency, a configuration using a hybrid system in which a motor is provided as a power source in addition to the engine and a hydraulic pump is driven by the motor and the engine is known. (For example, refer to Patent Document 1).

Further, as shown in the same patent document 1, in the hybrid system, a generator and an electric motor are provided as a power source in addition to the engine, and the generator is driven by surplus torque of the engine. Also known is a technique for storing generated electric energy in a battery, supplying the electric energy of the battery to an electric motor as needed, assisting the engine by rotating the electric motor, and reducing the load on the engine. .
Japanese Patent Laid-Open No. 2001-16704.

  However, the invention described in Patent Document 1 has a structure in which an electric motor and a generator are prepared separately. For this reason, there is a problem that the apparatus is increased in size and weight, and the cost is increased. In addition, when the torque of the hydraulic pump is low, the engine must be driven at a high speed, resulting in deterioration of fuel consumption and generation of noise.

  Therefore, there are technical problems to be solved in order to reduce the size and weight of the apparatus, reduce the cost, and always increase the output required for this kind of construction machine. It aims at solving this subject.

  The present invention has been proposed to achieve the above object, and the invention according to claim 1 is a construction machine comprising an engine, a hydraulic pump driven by the engine, and a battery for storing electric energy. In the power system controller for operation, the operation as a generator that is rotated by the engine, converts the rotated mechanical energy into electric energy, and supplies and stores the electric energy, and the electric energy received from the battery. An electric motor / generator capable of selectively performing operation as a torque assist electric motor converted into mechanical energy and supplied to the hydraulic pump; and detecting a load fluctuation of the engine to detect a high load of the engine During operation, the motor / generator is operated as the torque assist motor, and during light load operation of the engine, Control means for controlling switching of the electric motor / generator so that the electric motor / generator operates as the electric generator by surplus torque of the engine, and the torque setting value of the hydraulic pump is set to be equal to or higher than the output torque of the engine Provided is a power system controller for construction machinery.

  According to this configuration, one electric / generator converts the mechanical energy rotated by the engine into electrical energy and supplies it to the battery, and the electrical energy received from the battery is converted into mechanical energy. And an electric motor function of performing an operation of converting and supplying the hydraulic pump. The motor / generator is operated as a torque assist motor during high-load operation of the engine, and is operated as a generator after being rotated by surplus torque of the engine during light-load operation. By switching the function selection by the control means, a hybrid construction machine can be realized with the engine and one electric / generator.

  The hydraulic pump operates at a torque output higher than that of the engine. Accordingly, the power for operating the arm, the shovel, etc. is increased as compared with the construction machine driven by the engine alone.

  The invention according to claim 1 can realize a hybrid construction machine with an engine and one electric / generator, and by using one electric / generator in which the electric motor and the generator are integrated, The apparatus can be reduced in size and weight, and the cost can be reduced.

  In addition, by setting the torque setting value of the hydraulic pump to be equal to or greater than the engine output torque, the operating power of the arm, excavator, etc. is increased, fuel efficiency and noise are reduced, and the operating efficiency of the construction machine is improved. become.

  In order to achieve the objectives of miniaturization, weight reduction, cost reduction, and high output, the generator is rotated by an engine to convert the rotated mechanical energy into electric energy and supply it to a battery. One electric / generator capable of selectively performing the operation and the operation as an assisting electric motor that converts electric energy received from the battery into mechanical energy and supplies the mechanical pump, and the engine And a control means for detecting a load change and switching the operation of the motor / generator. Then, by switching the control means, the motor / generator is operated as a torque assist motor for the engine at a high load operation, and is operated as a generator by the surplus torque of the engine at a light load operation of the engine. I made it.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a hydraulic excavator as a construction machine to which the present invention is applied. In the hydraulic excavator 10, an upper swing body 13 is rotatably mounted on a lower traveling body 11 via a swing mechanism 12. The upper swing body 13 is provided with a cab 14 on one front side thereof, and a boom 15 is attached to the front center portion so as to be able to be raised and lowered. An arm 16 is attached to the tip of the boom 15 so as to be rotatable up and down, and a bucket 17 is attached to the tip of the arm 16.

  FIG. 2 is a block diagram showing a schematic configuration of a power system applicable to the excavator 10 shown in FIG. In FIG. 2, the power system of this embodiment includes an engine 21 for driving a hydraulic excavator, an electric / generator 22 and a hydraulic pump 23 connected to the power line of the engine 21, a control means 24, a battery, 25.

  The engine 21 is a diesel engine in the present embodiment, and the excavator 10 travels using the engine 21 as a drive source. The hydraulic pump 23 is also driven by the engine 21.

  The electric / generator 22 receives a function of a generator that converts mechanical energy rotated by the engine 21 into electric energy and stores the electric energy in the battery 25, and receives electric energy from the battery 25. It has a function as an electric motor for torque assist that converts the energy into driving the hydraulic pump 23, and has a structure in which the electric motor and the generator are housed in one housing.

  The hydraulic pump 23 drives each hydraulic cylinder that operates the boom 15, the arm 16, and the bucket 17, and operates by receiving the driving force of the engine 21 and the driving force of the electric / generator 22.

  The control means 24 includes a sensor 26, a limiter circuit 27, an inverter circuit 28, and a control circuit 29.

  The sensor 26 is a sensor that detects a load change of the engine.

  The limiter circuit 27 is a circuit that selectively switches between the function of the motor and the function of the generator that the motor / generator 22 has. When the electric motor / generator 22 is switched to the electric motor mode by the operation of the limiter circuit 27, the electric energy stored in the battery 25 is supplied to the electric motor / generator 22. On the contrary, when the electric / generator 22 is switched to the generator mode, the electric / generator 22 is rotated by the surplus torque of the engine 21, electric energy is generated from the electric / generator 22, and the electric energy is supplied to the battery 25. This is stored in the battery 25.

  When the electric energy stored in the battery 25 is supplied to the electric motor / generator 22, the inverter circuit 28 converts the electric energy into AC power and supplies it, and conversely, the electric energy is generated by the electric motor / generator 22. It has a conversion function for converting the AC power thus converted into DC power and supplying it to the battery 25.

  The control circuit 29 is a microcomputer (commonly referred to as “microcomputer”), and controls the operation of the motor / generator 22 and the rotation of the engine 21 via the limiter circuit 27 according to a preprogrammed procedure. .

  FIG. 3 is a flowchart showing an example of a control procedure programmed in the control circuit 29. Next, the operation of the power system control device shown in FIG. 2 will be described using the flowchart of FIG.

  First, the control circuit 29 determines whether the operation of the engine 21 is a light load operation state or a high load operation state from the load information of the sensor 26 (step S1). For example, when the engine speed is lower than the reference speed, the control circuit 29 determines that the engine is in a light load operation state and, on the contrary, determines that the engine is in a high load operation state.

  In the light load operation state, the control circuit 29 switches the motor / generator 22 to the generator mode and operates the engine 21 with a slight torque increase. The electric energy generated here is stored in the battery 25 through the inverter circuit 28 (step S2).

  On the contrary, in the high load operation state, the control circuit 29 switches the motor / generator 22 to the motor mode and rotates the motor / generator 22 to assist the torque of the engine 21 (step S3). . That is, when the motor / generator 2 performs torque assist during high load operation, the load on the engine 21 is reduced, load fluctuation of the engine 21 is reduced, and operation at the rated point is possible. Thereby, the fuel efficiency of the engine 21 can be improved and black smoke can be eliminated. Also, the engine sound can be kept low.

  Therefore, according to the configuration of the above-described embodiment of the present invention, the hybrid system power system control device for construction machines is configured by using the engine 21 and one motor / generator 22, so that the conventional device is a motor. Compared to a separate generator and generator, the structure can be simplified and the cost can be reduced. At the same time, it is possible to reduce the size and weight.

  Further, since the output torque (pump torque) of the hydraulic pump 23 can always be operated at the output torque (engine torque) or more of the engine 21, the operating power of the arm, excavator, etc. is increased, and the hydraulic excavator 10 is operated. The operating efficiency will be improved. FIG. 4 is a characteristic diagram of the hydraulic pump showing this.

  FIG. 4 illustrates the discharge pressure P of the hydraulic pump on the vertical axis, and the displacement volume Q of the hydraulic pump on the horizontal axis. In the figure, curve a represents the engine torque characteristic of the engine 21, curve b represents the pump torque characteristic of the hydraulic pump in the conventional apparatus driven by the engine 21 alone without using the hybrid system, and curve c represents the hybrid system. The characteristic of the pump torque of the hydraulic pump 23 in the apparatus of the present invention adopted, the curve d is the characteristic of the torque acting on the hydraulic pump 23 when driving the hydraulic pump 23 in the apparatus of the present invention, that is, the engine torque of the engine 21 The characteristic of the torque which synthesize | combined the electric motor torque of the generator 22 is each shown.

  As apparent from FIG. 4, the torque curve a of the hydraulic pump when driven by only the torque of the engine 21 without adopting the hybrid system is always located in a lower range than the torque curve b of the engine 21. The value of the pump output torque (pump torque) is less than the engine output torque (engine torque). On the other hand, since the hydraulic pump 23 in the device of the present invention is driven by a combined torque of the output torque of the engine 21 and the motor torque of the motor / generator 22, the output torque of the hydraulic pump 23 is the engine torque. 21 is always in the range above the torque curve b of the engine 21 and is equal to or higher than the output torque of the engine 21.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

The figure shows an embodiment of the present invention.
1 is an overall configuration diagram of a hydraulic excavator to which a construction machine power system control device according to the present invention is applied. The block diagram which shows schematic structure of the motive power system control apparatus in a hydraulic excavator same as the above. The flowchart which shows an example of the control procedure in the control circuit of a motive power system control apparatus same as the above. The figure which shows the torque characteristic of the hydraulic pump in this invention apparatus which employ | adopted the hybrid system, and the torque characteristic of the hydraulic pump in the conventional apparatus which does not employ | adopt a hybrid system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 21 Engine 22 Electricity / generator 23 Hydraulic pump 24 Control means 25 Battery 26 Sensor 27 Limiter circuit 28 Inverter circuit 29 Control circuit

Claims (1)

  1. In a power system controller for a construction machine comprising an engine, a hydraulic pump driven by the engine, and a battery for storing electric energy,
    Operation as a generator that is rotated by the engine, converts the rotated mechanical energy into electrical energy and supplies the battery to be stored, and converts the electrical energy received from the battery into mechanical energy to the hydraulic pump An electric motor / generator capable of selectively performing an operation as a torque assist electric motor to be supplied to
    The load variation of the engine is detected, the motor / generator is operated as the torque assist motor during high load operation of the engine, and the motor / power generation is performed by surplus torque of the engine during light load operation of the engine. Control means for controlling switching of the motor / generator so that a machine operates as the generator,
    A construction machine power system control device characterized in that a torque setting value of the hydraulic pump is equal to or greater than an output torque of the engine.
JP2003397807A 2003-11-27 2003-11-27 Power system control unit for construction machine Pending JP2005155251A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003397807A JP2005155251A (en) 2003-11-27 2003-11-27 Power system control unit for construction machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003397807A JP2005155251A (en) 2003-11-27 2003-11-27 Power system control unit for construction machine

Publications (1)

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JP2005155251A true JP2005155251A (en) 2005-06-16

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007064145A (en) * 2005-09-01 2007-03-15 Hitachi Constr Mach Co Ltd Hydraulic drive device for damp truck
WO2008123368A1 (en) * 2007-03-28 2008-10-16 Komatsu Ltd. Hybrid construction machine controlling method, and hybrid construction machine
WO2008145817A1 (en) * 2007-05-28 2008-12-04 Ponsse Oyj Method and arrangement associated with power source of forest machine
WO2009125833A1 (en) * 2008-04-11 2009-10-15 住友重機械工業株式会社 Operating machine
JP2010178575A (en) * 2009-01-31 2010-08-12 Sumitomo (Shi) Construction Machinery Co Ltd Electrohydraulic conversion device
CN102032314A (en) * 2009-09-29 2011-04-27 神钢建设机械株式会社 Hybrid construction machine
JP2012007534A (en) * 2010-06-24 2012-01-12 Hitachi Constr Mach Co Ltd Exhaust emission control system of construction machine
US9103094B2 (en) 2011-06-14 2015-08-11 Sumitomo(S.H.I.) Construction Machinery Co., Ltd. Hybrid work machine and method of controlling same
KR101565161B1 (en) 2008-12-17 2015-11-02 두산인프라코어 주식회사 Power control apparatus for hybrid contruction machinery
CN105984460A (en) * 2015-03-20 2016-10-05 通用汽车环球科技运作有限责任公司 Method of controlling a powertrain of a vehicle
WO2017030472A1 (en) * 2015-03-16 2017-02-23 سعود Method for powering and operating hydraulic equipment by means of electrical energy

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007064145A (en) * 2005-09-01 2007-03-15 Hitachi Constr Mach Co Ltd Hydraulic drive device for damp truck
JP4550698B2 (en) * 2005-09-01 2010-09-22 日立建機株式会社 Dump truck hydraulic drive
KR101120452B1 (en) 2007-03-28 2012-03-02 가부시키가이샤 고마쓰 세이사쿠쇼 Hybrid construction machine controlling method, and hybrid construction machine
WO2008123368A1 (en) * 2007-03-28 2008-10-16 Komatsu Ltd. Hybrid construction machine controlling method, and hybrid construction machine
DE112008000818B4 (en) * 2007-03-28 2017-12-14 Komatsu Ltd. Method for controlling a hybrid construction machine and hybrid construction machine
JP4892057B2 (en) * 2007-03-28 2012-03-07 株式会社小松製作所 Control method of hybrid construction machine and hybrid construction machine
US8439139B2 (en) 2007-03-28 2013-05-14 Komatsu Ltd. Method of controlling hybrid construction machine and hybrid construction machine
WO2008145817A1 (en) * 2007-05-28 2008-12-04 Ponsse Oyj Method and arrangement associated with power source of forest machine
JP5384476B2 (en) * 2008-04-11 2014-01-08 住友重機械工業株式会社 Work machine
US8798875B2 (en) 2008-04-11 2014-08-05 Sumitomo Heavy Industries, Ltd. Working machine
WO2009125833A1 (en) * 2008-04-11 2009-10-15 住友重機械工業株式会社 Operating machine
CN101990505B (en) * 2008-04-11 2013-12-11 住友重机械工业株式会社 Operating machine
KR101565161B1 (en) 2008-12-17 2015-11-02 두산인프라코어 주식회사 Power control apparatus for hybrid contruction machinery
JP2010178575A (en) * 2009-01-31 2010-08-12 Sumitomo (Shi) Construction Machinery Co Ltd Electrohydraulic conversion device
US8469136B2 (en) 2009-09-29 2013-06-25 Kobelco Construction Machinery Co., Ltd. Hybrid construction machine
CN102032314A (en) * 2009-09-29 2011-04-27 神钢建设机械株式会社 Hybrid construction machine
JP2012007534A (en) * 2010-06-24 2012-01-12 Hitachi Constr Mach Co Ltd Exhaust emission control system of construction machine
US9103094B2 (en) 2011-06-14 2015-08-11 Sumitomo(S.H.I.) Construction Machinery Co., Ltd. Hybrid work machine and method of controlling same
WO2017030472A1 (en) * 2015-03-16 2017-02-23 سعود Method for powering and operating hydraulic equipment by means of electrical energy
CN105984460A (en) * 2015-03-20 2016-10-05 通用汽车环球科技运作有限责任公司 Method of controlling a powertrain of a vehicle
US10189469B2 (en) 2015-03-20 2019-01-29 GM Global Technology Operations LLC Method of controlling a powertrain of a vehicle

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