CN113815435B - Power system of electric hydraulic excavator - Google Patents
Power system of electric hydraulic excavator Download PDFInfo
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- CN113815435B CN113815435B CN202111035435.6A CN202111035435A CN113815435B CN 113815435 B CN113815435 B CN 113815435B CN 202111035435 A CN202111035435 A CN 202111035435A CN 113815435 B CN113815435 B CN 113815435B
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- motor
- alternating current
- branch
- mcu
- power supply
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/53—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells in combination with an external power supply, e.g. from overhead contact lines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
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- 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
- E02F9/207—Control of propulsion units of the type electric propulsion units, e.g. electric motors or generators
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention relates to a power system of an electro-hydraulic excavator, comprising: a battery-driven system, an alternating current-driven system; the battery-driven system includes: the lithium battery pack drives the motor to rotate through the MCU and the alternating current control box; the alternating current drive system includes: the alternating current power supply charges the lithium battery through the MCU while driving the motor to rotate through the alternating current control box; the motor drives the main pump to move; the device realizes the switching between the lithium battery and the alternating current power supply at any time, thereby realizing the complementation of two energy supply modes, and has the advantages of transition, convenient use, unlimited endurance, convenient charging, low production cost and low operation and maintenance cost.
Description
Technical Field
The invention relates to a power system, in particular to a power system of an electro-hydraulic excavator.
Background
Currently, there are two main driving modes of an electro-hydraulic excavator: 1. the lithium battery is an energy driving motor; and 2, the alternating current is an energy driving motor. The advantages and disadvantages of the two schemes are very obvious: 1. lithium battery: the cable does not influence the operation of the vehicle, the transition and the use are convenient, and basically have no difference with the internal combustion engine; however, the cost is high, the endurance time is limited, the charging pile needs to be built in a certain operation range, the charging time is long, and the construction time is limited; 2. alternating current: the cost is low, the electric vehicle can work without charging, the problem of continuous voyage is avoided, and the electric vehicle can be dried and alive after the electric vehicle is powered on; but the transition is difficult, and the cable is arranged around the car body when the automobile is used.
In summary, how to realize the switching between the lithium battery and the alternating current power supply at any time becomes a problem which needs to be solved by researchers of the company.
Disclosure of Invention
The invention aims to solve the technical problems that: how to realize the switching between the lithium battery and the alternating current power supply at any time;
in order to solve the technical problems, the invention adopts the following technical scheme:
the invention is a power system of an electro-hydraulic excavator, comprising: a battery-driven system, an alternating current-driven system; the battery-driven system includes: the lithium battery pack drives the motor to rotate through the MCU and the alternating current control box; the alternating current drive system includes: the alternating current power supply charges the lithium battery through the MCU while driving the motor to rotate through the alternating current control box; the motor drives the main pump to move;
in the scheme, the lithium battery pack can be converted into alternating current to drive the motor to rotate, the main pump is driven to move through the coupler, and the alternating current can be charged to the lithium battery when the alternating current directly drives the main pump to move through the motor.
In order to specifically explain a power system, the lithium battery pack is adopted to drive the main pump to move through the PDU, the MCU, the alternating current control box, the motor and the coupler in sequence; the alternating-current power supply drives the main pump to move through the alternating-current charging port, the alternating-current control box, the motor and the coupler, and simultaneously, the alternating-current power supply charges the lithium battery pack through the alternating-current charging port, the alternating-current control box, the MCU and the PDU;
in the route of the lithium battery pack, the lithium battery pack sequentially passes through a PDU (power distribution unit), an MCU (micro controller unit) (DC-AC), an alternating current control box, a motor and a main pump;
in the alternating current power supply, the alternating current power supply sequentially passes through an alternating current charging port, an alternating current control box, a motor and a main pump, and meanwhile, the alternating current charging port charges the lithium battery pack through the alternating current control box, an MCU (DC-AC), a PDU (power distribution unit).
Wherein: lithium battery pack: a lithium battery power supply system; PDU: a DC high voltage distribution box; MCU: a motor driver; ac control box: switching a power supply, detecting phase sequence and protecting an alternating current loop; and (3) a motor: and the motor system drives the main pump to supply power to the whole machine.
In order to illustrate a specific device of the motor, the motor is a three-phase asynchronous motor.
To illustrate a particular wiring arrangement for an ac control box, the present invention employs an ac control box comprising: the first branch is connected with the MCU and the first end of the motor, and is provided with KM1; the second branch is connected with the MCU and the second end of the motor, and is provided with KM2; the direct current provided by the lithium battery pack is converted into alternating current through the MCU, and the motor is driven to rotate through the first branch circuit and the second branch circuit; the third branch is connected with an alternating current power supply and the MCU, and is provided with KM3; the alternating current power supply charges the MCU through a third branch; a fourth branch connected with an alternating current power supply and a first end of the motor, and provided with KM4; a fifth branch connected with the fourth branch and the second end of the motor, and provided with KM5; the alternating current power supply supplies power to the motor through a fourth branch circuit and a fifth branch circuit and drives the motor to rotate; a sixth branch circuit, which is used for shorting the second end of the motor and is provided with KM6; the first end of the motor includes: u1, V1, W1; the second end of the motor includes: u2, V2, W2;
the power supply system is selected by an operator, when the branch 1 is selected, the VCU is connected with the KM1/KM2, the KM3/KM4/KM5/KM6 is disconnected, the MCU is directly connected with the motor, the motor converts direct-current high-voltage power into alternating current power for use, and the whole machine adopts a lithium battery driving mode.
When selecting branch 2
If the motor is not started:
the motor is started by MCU, when the motor runs to 1400 turns, KM1/KM2 is disconnected, KM6 is kept disconnected, KM3/KM4/KM5 is attracted, and the motor enters a power frequency running state (soft start).
If the motor is in operation:
controlling the rotation speed of the motor to 1400 revolutions, switching off KM1/KM2, keeping KM6 switched off, switching on KM3/KM4/KM5, enabling the motor to enter a power frequency running state MCU and enter a feedback system, and charging the battery. At the moment, the VCU calculates feedback current according to rated power, calculates feedback current value in real time, and ensures that the requirement on the power grid is kept in the rated load.
If the MCU fails, star-delta voltage reduction starting can be realized through KM4/KM5/KM6, and the motor is started for use.
Wherein, VCU is whole vehicle control unit, and branch road 1 is direct current power supply return circuit, and branch road 2 is alternating current power supply return circuit.
The invention has the beneficial effects that: the invention relates to a power system of an electric hydraulic excavator, which realizes the switching between a lithium battery and an alternating current power supply at any time, thereby realizing the complementation of two energy supply modes, and has the advantages of convenient transition and use, unlimited endurance, convenient charging, low production cost and low operation and maintenance cost.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a circuit diagram of an AC control box;
in the figure: 1-lithium battery pack, 2-3-MCU, 4-AC control box, 5-motor, 6-main pump, 7-AC power supply, 8-AC charging mouth, 11-first branch, 12-second branch, 13-third branch, 14-fourth branch, 15-fifth branch, 16-sixth branch.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the invention and therefore show only the structures which are relevant to the invention.
As shown in fig. 1, the present invention is a power system of an electro-hydraulic excavator, comprising: a battery-driven system, an alternating current-driven system; the battery-driven system includes: the lithium battery pack 1 drives the motor 5 to rotate through the MCU3 and the alternating current control box 4; the alternating current drive system includes: an ac power supply 7 for charging the lithium battery pack 1 through the MCU3 while driving the motor 5 to rotate through the ac control box 4; the motor 5 drives the main pump 6 to move;
in the scheme, the lithium battery pack can be converted into alternating current to drive the motor to rotate, the main pump is driven to move through the coupler, and the alternating current can be charged to the lithium battery when the alternating current directly drives the main pump to move through the motor.
As shown in fig. 1, in order to specifically illustrate a power system, a lithium battery pack 1 is adopted to drive a main pump 6 to move through a PDU2, an MCU3, an alternating current control box 4, a motor 5 and a coupling in sequence; the alternating current power supply 7 drives the main pump 6 to move through the alternating current charging port 8, the alternating current control box 4, the motor 5 and the coupler, and meanwhile, the alternating current power supply 7 charges the lithium battery pack 1 through the alternating current charging port 8, the alternating current control box 4, the MCU3 and the PDU 2;
in the route of the lithium battery pack, the lithium battery pack sequentially passes through a PDU (power distribution unit), an MCU (micro controller unit) (DC-AC), an alternating current control box, a motor and a main pump;
in the AC power supply, the AC power supply sequentially passes through an AC charging port 8, an AC control box 4, a motor 5, and a main pump 6, and the AC charging port 8 charges the lithium battery pack 1 through the AC control box 4, an MCU (DC-AC) 3, and PDU 2.
Wherein: lithium battery pack: a lithium battery power supply system; PDU: a DC high voltage distribution box; MCU: a motor driver; ac control box: switching a power supply, detecting phase sequence and protecting an alternating current loop; and (3) a motor: and the motor system drives the main pump to supply power to the whole machine.
As shown in fig. 1, in order to illustrate a specific apparatus of the motor, the present invention adopts a motor 5 as a three-phase asynchronous motor.
As shown in fig. 2, to illustrate a specific circuit arrangement of the ac control box, the present invention employs an ac control box including: a first branch 11 connected with the MCU3 and the first end of the motor 5 and provided with a KM1; a second branch 12 connected with the MCU3 and the second end of the motor 5 and provided with a KM2; the direct current provided by the lithium battery pack 1 is converted into alternating current through the MCU3, and the motor is driven to rotate through the first branch circuit 11 and the second branch circuit 12; the third branch circuit 13 is connected with the alternating current power supply 7 and the MCU3, and is provided with a KM3; the alternating current power supply 7 charges the MCU3 through the third branch 13; a fourth branch 14 connected to the ac power source 7 and the first end of the motor 5, and having KM4 disposed thereon; a fifth branch 15 connected to the fourth branch 14 and the second end of the motor 5, and having KM5 disposed thereon; the alternating current power supply 7 supplies power to the motor 5 through the fourth branch circuit 14 and the fifth branch circuit 15 and drives the motor 5 to rotate; a sixth branch 16 for shorting the second end of the motor 5, on which KM6 is disposed; the first end of the motor 5 comprises: u1, V1, W1; the second end of the motor 5 comprises: u2, V2, W2;
the power supply system is selected by an operator, when the branch 1 is selected, the VCU is connected with the KM1/KM2, the KM3/KM4/KM5/KM6 is disconnected, the MCU is directly connected with the motor, the motor converts direct-current high-voltage power into alternating current power for use, and the whole machine adopts a lithium battery driving mode.
When selecting branch 2
If the motor is not started:
the motor is started by MCU, when the motor runs to 1400 turns, KM1/KM2 is disconnected, KM6 is kept disconnected, KM3/KM4/KM5 is attracted, and the motor enters a power frequency running state (soft start).
If the motor is in operation:
controlling the rotation speed of the motor to 1400 revolutions, switching off KM1/KM2, keeping KM6 switched off, switching on KM3/KM4/KM5, enabling the motor to enter a power frequency running state MCU and enter a feedback system, and charging the battery. At the moment, the VCU calculates feedback current according to rated power, calculates feedback current value in real time, and ensures that the requirement on the power grid is kept in the rated load.
If the MCU fails, star-delta voltage reduction starting can be realized through KM4/KM5/KM6, and the motor is started for use.
Wherein, VCU is whole vehicle control unit, and branch road 1 is direct current power supply return circuit, and branch road 2 is alternating current power supply return circuit.
The advantage of this patent, 1, lithium cell driven excavator has multichannel loss on energy conversion: a. conversion efficiency of the charger; b. the charge-discharge conversion efficiency of the lithium battery; c. MCU conversion efficiency; when alternating current is used for direct driving, the three energy losses can be saved, and the economy is better.
2. The excavator is slow in running speed, the charging pile needs to be subjected to position adjustment along with the operation radius of the vehicle, otherwise, the running distance is too long, and the operation time is reduced indirectly. This patent only needs to remove the block terminal, promotes greatly at construction site maneuverability
3. The reliability is improved, when the direct current high-voltage system fails, the whole machine can be powered forcibly by adopting an alternating current system, and the control system is powered continuously by adopting a lead-acid battery and a switching power supply, so that the vehicle can withdraw from a construction position, and delay period caused by incapability of moving the vehicle is avoided.
4. The lithium battery powered 20 ton class excavator needs to use more than 500kwh of electricity to realize continuous operation for 8 hours and needs 3-4 hours to fully charge. The working time is not proportional to the charging time, and the situation of short construction period cannot be dealt with. By adopting the battery, the electric quantity of the battery only needs 150kWh, no external power supply can ensure the whole machine to work for 2 hours, the working conditions of equipment transition, short-time power failure and the like can be ensured, the adaptability of each scene of the host is improved, and the cost of the whole machine is greatly reduced.
The invention relates to a power system of an electric hydraulic excavator, which realizes the switching between a lithium battery and an alternating current power supply at any time, thereby realizing the complementation of two energy supply modes, and has the advantages of convenient transition and use, unlimited endurance, convenient charging, low production cost and low operation and maintenance cost.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (3)
1. A power system for an electro-hydraulic excavator, comprising: a battery-driven system, an alternating current-driven system;
the battery-driven system includes:
the lithium battery pack drives the motor to rotate through the MCU and the alternating current control box;
the alternating current drive system includes:
the alternating current power supply charges the lithium battery pack through the MCU while driving the motor to rotate through the alternating current control box;
the motor drives the main pump to move;
the ac control box includes:
the first branch is connected with the MCU and the first end of the motor, and is provided with KM1;
the second branch is connected with the MCU and the second end of the motor, and is provided with KM2;
the direct current provided by the lithium battery pack is converted into alternating current through the MCU, and the motor is driven to rotate through the first branch circuit and the second branch circuit;
the third branch is connected with the alternating current power supply and the MCU, and is provided with KM3;
the alternating current power supply charges the MCU through the third branch;
a fourth branch connected with the alternating current power supply and the first end of the motor, and provided with KM4;
a fifth branch connected with the fourth branch and the second end of the motor, and provided with KM5;
the alternating current power supply supplies power to the motor through a fourth branch and a fifth branch and drives the motor to rotate;
a sixth branch circuit, which is used for shorting the second end of the motor and is provided with KM6;
the first end of the motor includes: u1, V1, W1;
the second end of the motor includes: u2, V2, W2.
2. The power system of the electro-hydraulic excavator according to claim 1, wherein the lithium battery pack drives the main pump to move through the PDU, the MCU, the alternating current control box, the motor and the coupling in sequence;
the alternating current power supply drives the main pump to move through the alternating current charging port, the alternating current control box, the motor and the coupling, and simultaneously, the alternating current power supply charges the lithium battery pack through the alternating current charging port, the alternating current control box, the MCU and the PDU.
3. The power system of an electro-hydraulic excavator of claim 1 wherein the electric motor is a three-phase asynchronous motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111035435.6A CN113815435B (en) | 2021-09-03 | 2021-09-03 | Power system of electric hydraulic excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111035435.6A CN113815435B (en) | 2021-09-03 | 2021-09-03 | Power system of electric hydraulic excavator |
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| CN113815435A CN113815435A (en) | 2021-12-21 |
| CN113815435B true CN113815435B (en) | 2023-07-07 |
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| DE102018004623A1 (en) * | 2018-06-11 | 2019-01-31 | Daimler Ag | Method for supplying power to an electrically powered vehicle and power supply device for an electrically powered vehicle |
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| CN209873925U (en) * | 2019-04-09 | 2019-12-31 | 山重建机有限公司 | Mobile power supply electric hydraulic excavator |
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| JP5371209B2 (en) * | 2007-06-14 | 2013-12-18 | 日立建機株式会社 | Work vehicle |
| CN103204080B (en) * | 2013-03-27 | 2015-11-11 | 株洲高新技术产业开发区壹星科技有限公司 | Electric locomotive is interim motor-car method of supplying power to and electric power system after cutting off mains supply |
| CN204644940U (en) * | 2015-02-03 | 2015-09-16 | 浙江亚特电器有限公司 | Hybrid power drives snowplow |
| CN105763114B (en) * | 2016-04-25 | 2018-05-25 | 南京航空航天大学 | A kind of control method of double-winding asynchronous alternating current-direct current starting-generating system |
| JP2019190104A (en) * | 2018-04-24 | 2019-10-31 | ヤンマー株式会社 | Electric driven work machine |
| JP7346957B2 (en) * | 2019-07-12 | 2023-09-20 | 株式会社デンソー | Charging control device |
| CN111497636A (en) * | 2020-04-30 | 2020-08-07 | 三一重机有限公司 | Integrated control system of electric excavator and electric excavator system |
| CN111900796A (en) * | 2020-09-02 | 2020-11-06 | 三一重机有限公司 | Control system of electric excavator and electric excavator |
| CN113323069B (en) * | 2021-06-04 | 2022-11-29 | 三一重机有限公司 | Power system suitable for electric excavator and control method thereof |
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- 2021-09-03 CN CN202111035435.6A patent/CN113815435B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018004623A1 (en) * | 2018-06-11 | 2019-01-31 | Daimler Ag | Method for supplying power to an electrically powered vehicle and power supply device for an electrically powered vehicle |
| CN208947111U (en) * | 2018-10-18 | 2019-06-07 | 北京睿来电控科技有限公司 | Distributed bidirectional for electric car drives rechargeable electrical energy transformation system |
| CN209873925U (en) * | 2019-04-09 | 2019-12-31 | 山重建机有限公司 | Mobile power supply electric hydraulic excavator |
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