CN114030364A

CN114030364A - Engineering machinery energy management system, method and device and storage medium

Info

Publication number: CN114030364A
Application number: CN202010742299.3A
Authority: CN
Inventors: 易琅琳
Original assignee: Sichuan Dinghong Zhidian Equipment Technology Co ltd
Current assignee: Sichuan Dinghong Zhidian Equipment Technology Co ltd
Priority date: 2020-07-29
Filing date: 2020-07-29
Publication date: 2022-02-11
Also published as: WO2022022594A1

Abstract

The embodiment of the application discloses an engineering machinery energy management system, a method, a device and a storage medium, wherein a central controller in the system is used for respectively controlling the operation of a range extender, an energy management unit, a lithium battery system and a load; the range extender supplies power to the load according to the preset power, and in the power supply process, when the preset power is larger than the power required by the load, the range extender supplies power to the load and charges the lithium battery system; when the preset power of the range extender is smaller than the power required by the load, the lithium battery system and the range extender simultaneously supply power to the load; the energy management unit is used for controlling the on-off of circuits between the range extender, the load and the lithium battery system. According to the embodiment of the application, the range extender supplies power to the load according to the preset power, and most of the power output by the range extender is directly supplied to the load, so that energy conversion consumption in the charging and discharging processes of the energy storage system is avoided, and the energy efficiency of the range extender is greatly improved.

Description

Engineering machinery energy management system, method and device and storage medium

Technical Field

The application relates to the technical field of engineering machinery, in particular to an engineering machinery energy management system, method, device and storage medium.

Background

Engineering machinery is an important component of the equipment industry, and is necessary mechanical equipment for comprehensive mechanical construction engineering required by earth and stone construction engineering, pavement construction and maintenance, mobile hoisting, loading and unloading operation and various building engineering.

The traditional engineering machinery adopts a single energy driving mode, for example, a diesel internal combustion engine is adopted to drive the engineering machinery to work, or a novel pure electric driving mode is adopted to provide working energy for the engineering machinery. However, the diesel internal combustion engine has large consumption of energy, certain pollution to the environment and high cost; and the pure electric driving mode is not ideal for the engineering machinery needing to work for a long time because the power battery needs to be charged by frequently stopping working, and the endurance time and the endurance mileage are not ideal.

Based on the development of the technology, the extended-range hybrid engineering machinery comes up with the operation, and on the basis of pure electric drive, an internal combustion engine is additionally arranged to charge a power battery or directly drive a motor to increase the endurance mileage of the engineering machinery, so that the problem of short endurance mileage of the pure electric drive is solved. However, most of the conventional range-extended hybrid construction machines are powered by a power battery, and in a power battery power supply scheme, the output energy of a range extender is consumed and supplied to a load through the conversion of the power battery, so that the energy efficiency of the range extender is low.

Disclosure of Invention

The application provides an energy management system, method, device and storage medium for engineering machinery, and aims to solve the problem that in a power battery power supply scheme of an extended range type hybrid engineering machinery in the prior art, output energy of a range extender is consumed to supply a load through conversion of a power battery, energy efficiency of the range extender is low, and working energy efficiency of the extended range device of the engineering machinery is improved.

In a first aspect, the present application provides an engineering machine energy management system, including a central controller, a range extender, an energy management unit and a lithium battery system, wherein the energy management unit is used for connecting a load, and the load is in communication connection with the central controller, wherein:

the central controller is used for respectively controlling the operation of the range extender, the energy management unit, the lithium battery system and the load;

the range extender supplies power to the load according to the preset power, and in the power supply process, when the preset power is larger than the power required by the load, the range extender supplies power to the load and charges the lithium battery system;

when the preset power is smaller than the power required by the load, the lithium battery system and the range extender simultaneously supply power to the load;

the energy management unit is used for controlling the on-off state of circuits between the range extender, the load and the lithium battery system when the range extender supplies power to the load and the lithium battery system charges or when the lithium battery system and the range extender supply power to the load, so as to complete power supply.

In one possible implementation manner of the present application, the lithium battery system is further configured to recover feedback energy generated by the load when the engineering machine is braked or decelerated.

In one possible implementation manner of the present application, when the electric quantity of the lithium battery system reaches a first preset electric quantity, the lithium battery system is configured to supply power to the load alone.

In one possible implementation manner of the present application, the lithium battery system is further configured to provide starting electric energy for the range extender when the range extender is started.

In this application a possible implementation, the system still includes super capacitor system and one-way device that switches on, and central controller still is used for controlling super capacitor system and one-way device that switches on respectively, and super capacitor system is connected with the energy management unit electricity, and super capacitor system is connected with lithium battery system electricity through one-way device that switches on, and the one-way direction that switches on the device is the direction from super capacitor system to lithium battery system, wherein:

when the preset power is larger than the power required by the load, the energy management unit simultaneously conducts a circuit between the range extender and the super capacitor and a circuit between the range extender and the load, so that the range extender supplies power to the load and simultaneously charges the super capacitor system, and after the electric quantity of the super capacitor system reaches a second preset electric quantity, the super capacitor system supplies the electric quantity which is more than the second preset electric quantity to the lithium battery system through the one-way conduction device for charging;

when the preset power is smaller than the power required by the load, the energy management unit simultaneously conducts a circuit between the super capacitor system and the load and a circuit between the range extender and the load, so that the range extender and the super capacitor system simultaneously supply power to the load.

In one possible implementation manner of the present application, the system further includes a bidirectional voltage converter in communication connection with the central controller, the bidirectional voltage converter is electrically connected with the super capacitor system and the energy management unit respectively, wherein:

the bidirectional voltage converter is used for reducing the input voltage of the super capacitor system and boosting the output voltage of the super capacitor system.

In a second aspect, the present application further provides an engineering machine energy management method, which is applied to a central controller, where the central controller is located in an engineering machine energy management system, the engineering machine energy management system further includes a range extender, an energy management unit, and a lithium battery system, where the energy management unit is used to connect to a load, and the load is in communication connection with the central controller, and the method includes:

controlling a range extender to supply power to a load according to preset power, and detecting the preset power and the power required by the load in the power supply process;

when the preset power is larger than the power required by the load, controlling the on-off state of a circuit between the range extender, the load and the lithium battery system, so that the range extender supplies power to the load and charges the lithium battery system at the same time;

and when the preset power is smaller than the power required by the load, controlling the on-off state of a circuit between the range extender, the load and the lithium battery system, so that the range extender and the lithium battery system simultaneously supply power to the load.

In this application a possible implementation, engineering machine tool energy management system still includes one-way device and the super capacitor system that switches on, central controller still is used for controlling super capacitor system and one-way device that switches on respectively, super capacitor system is connected with the energy management unit electricity, super capacitor system is connected with lithium battery system electricity through one-way device that switches on, the one-way direction that switches on the device is the direction from super capacitor system to lithium battery system, the control increases the journey ware, the break-make state of the circuit between load and the lithium battery system two liang, so that increase the journey ware and charge for lithium battery system when for the load power supply, include:

the energy management unit is controlled to simultaneously conduct a circuit between the range extender and the super capacitor system and a circuit between the range extender and the load, so that the range extender supplies power to the load and charges the super capacitor system, and after the electric quantity of the super capacitor system reaches the second preset electric quantity, the super capacitor system is controlled to supply the electric quantity of the super capacitor system, which is more than the second preset electric quantity, to the lithium battery system through the one-way conduction device for charging.

In a third aspect, the present application further provides an energy management device for a construction machine, including:

the power detection module is used for controlling the range extender to supply power to the load according to the preset power and detecting the preset power and the power required by the load in the power supply process;

the power supply control module is used for controlling the on-off state of circuits between the range extender, the load and the lithium battery system when the preset power is larger than the power required by the load, so that the range extender supplies power to the load and charges the lithium battery system at the same time;

In a fourth aspect, the present application also provides a computer readable storage medium having a computer program stored thereon, the computer program being loaded by a processor to perform the steps of the method of any of the second aspects.

In the application, supply power for the load through making the range extender according to predetermineeing the power, when the required power of load is the same with the power of predetermineeing of range extender, the range extender independently supplies power for the load, energy conversion consumption among the energy storage system charge-discharge process has been avoided, the efficiency of range extender has been improved, when the load operating mode is unstable, when needing higher operating power, supply required power for the load through lithium battery system, when the required power of load is less than the preset power of range extender, provide lithium battery system with unnecessary power and charge, can make the range extender work in energy-efficient district steadily all the time, the work efficiency of range extender has been improved greatly.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of a work machine energy management system provided by an embodiment of the present application;

FIG. 2 is a schematic structural diagram of another embodiment of a work machine energy management system provided in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of another embodiment of a work machine energy management system provided in an embodiment of the present application;

FIG. 4 is a schematic flow chart diagram illustrating an embodiment of a method for managing work machine energy provided by an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of an embodiment of an energy management device of a construction machine provided in an embodiment of the present application;

fig. 6 is a schematic structural diagram of an embodiment of the apparatus provided in the embodiments of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes are not set forth in detail in order to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

Embodiments of the present disclosure provide a system, a method, an apparatus, and a storage medium for engineering machinery energy management, which are described in detail below.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of an energy management system of a construction machine according to an embodiment of the present disclosure, where the energy management system of the construction machine may include: the energy management system comprises a central controller 100, a range extender 200, an energy management unit 300 and a lithium battery system 400, wherein the energy management unit 300 is electrically connected with a load 500, and the load 500 is in communication connection with the central controller 100.

Referring to fig. 1, the central controller 100, the range extender 200, the energy management unit 300, the lithium battery system 400 and the load 500 may be communicatively connected by any Communication method, including but not limited to a Serial Communication (Serial Communication) method, a Wireless Communication (Wireless Communication) method, and the like. The central controller 100 may implement data transmission and control with the range extender 200, the energy management unit 300, the lithium battery system 400, and the load 500 through the above-mentioned communication manner.

In this application embodiment, extend journey ware 200 can be including the engine, generator and the two-way alternating current-direct current converter that connect gradually, wherein, the engine is connected with generator machinery, the generator is connected with two-way alternating current-direct current converter electricity, the engine is used for producing kinetic energy, the generator is used for converting the kinetic energy that the engine produced into the alternating current, two-way alternating current-direct current converter is used for converting this alternating current into direct current output, be used for supplying power for lithium battery system 400 and load 500, also can be used for converting the direct current of lithium battery system 400 output into alternating current input, drive the engine start.

In the embodiment of the present application, the engine may be a gasoline engine, a diesel engine, a Compressed Natural Gas (CNG) engine, a Liquefied Natural Gas (LNG) engine, and other common engines on the market at present, the generator may be different types of generators such as a synchronous generator, an asynchronous generator, a single-phase generator, and a three-phase generator, and the bidirectional ac/dc converter may be any type of Rectifier/Inverter (Inverter) that is currently available, and is not limited herein specifically, in addition, the generator and the bidirectional ac/dc converter of the embodiment of the present application may be replaced by an existing dc generator on the market at present, and the range extender 200 may also be replaced by a fuel cell system.

The energy management Unit 300 in the embodiment of the present application may be a Power Distribution Unit (PDU) or other devices for realizing Power Distribution, and the lithium battery system in the embodiment of the present application may be replaced by a lead-acid battery system, a nickel-metal hydride battery system, or other battery systems.

The load 500 in the embodiment of the present application may be a motor, a compressor, a heater, or other devices that need to consume energy or generate feedback energy. The feedback energy specifically refers to electric energy which can be recovered and stored, and the electric energy can be converted from related mechanical energy such as potential energy and kinetic energy.

It will be understood by those skilled in the art that the schematic structural diagram shown in fig. 1 is only one structural diagram of the present disclosure, and does not limit the present disclosure, and other application scenarios may further include more energy storage systems than those shown in fig. 1, for example, only 1 lithium battery system is shown in fig. 1, and it is understood that the energy management system of the construction machine may further include 2 or more other energy storage systems communicatively connected to the central controller 100 and electrically connected to the energy management unit 300, and is not limited herein.

It should be noted that the schematic structural diagram of the energy management system of the construction machine shown in fig. 1 is only an example, and the energy management system and the structure of the construction machine described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not constitute a limitation to the technical solution provided in the embodiment of the present application.

First, an embodiment of the present application provides an energy management system for construction machinery, as shown in fig. 1, the system includes a central controller 100, a range extender 200, an energy management unit 300, and a lithium battery system 400, where the energy management unit 300 is configured to connect to a load 500, where:

the central controller 100 is in communication connection with the range extender 200, the energy management unit 300, the lithium battery system 400 and the load 500, respectively, and is configured to control operations of the range extender 200, the energy management unit 300, the lithium battery system 400 and the load 500, respectively.

In the embodiment of the present application, the central controller 100 is respectively in communication with the range extender 200, the energy management unit 300, the lithium battery system 400 and the load 500, receives feedback information of the range extender 200, the energy management unit 300, the lithium battery system 400 and the load 500, and simultaneously sends a control instruction to the range extender 200, the energy management unit 300, the lithium battery system 400 and the load 500 to instruct operations of the range extender 200, the energy management unit 300, the lithium battery system 400 and the load 500. It should be noted that the central controller 100 in this embodiment of the application may be a device having a control function, or may be composed of different controllers, for example, one controller may be respectively configured for the range extender 200, the energy management unit 300, the lithium battery system 400, and the load 500 to control the range extender 200, the energy management unit 300, the lithium battery system 400, and the load 500, and the central controller 100 of this embodiment further has functions of fault judgment, allocation policy adjustment, real-time monitoring, and the like, and specific functions of the central controller 100 may be selectively adjusted according to an actual application scenario.

The range extender 200 supplies power to the load 500 according to the preset power, and in the power supply process, when the preset power is larger than the power required by the load 500, the range extender 200 supplies power to the load 500 and charges the lithium battery system 400.

In the embodiment of the present application, the preset power of the range extender 200 is set in the efficient energy-saving region of the range extender 200, so that the range extender 200 stably outputs with the lowest energy consumption and the highest efficiency to provide the working electric energy for the load 500, when the preset power of the range extender 200 is the same as the power required by the load 500, the range extender 200 independently supplies power to the load 500, and because the working environment of the engineering machinery is complex, the power required by the load 500 is not at a constant value, when the preset power output by the range extender 200 is greater than the power required by the load 500, the range extender 200 supplies the excess power, that is, the power not required by the load 500, to the lithium battery system 400, and charges the lithium battery system 400.

When the preset power of the range extender 200 is smaller than the power required by the load 500, the lithium battery system 400 and the range extender 200 simultaneously supply power to the load 500.

As above, in the embodiment of the present application, the preset power of the range extender 200 is set in the efficient energy-saving region of the range extender 200, so that the range extender 200 stably outputs with the lowest energy consumption and the highest efficiency to provide the working electric energy for the load 500, and since the working environment of the engineering machinery is complex, the power required by the load 500 is not at a constant value, when the preset power output by the range extender 200 is smaller than the power required by the load 500, the lithium battery system 400 supplies the load 500 with insufficient power while the range extender 200 supplies power to the load 500, so as to ensure the normal operation of the load 500.

The energy management unit 300 is configured to control the on-off state of the circuit between the range extender 200, the load 500, and the lithium battery system 400 in the process of supplying power to the load 500 by the range extender 200 at the same time or in the process of supplying power to the load 500 by the lithium battery system 400 and the range extender 200 at the same time, so as to complete power supply.

In the embodiment of the present application, the energy management unit 300 includes a first switch K1 and a second switch K2, the range extender 200 is connected with the load 500 through a first switch K1, the lithium battery system 400 is connected with the load 500 through a second switch K2, the range extender 200 is connected with the lithium battery system 400 through a first switch K1 and a second switch K2, the energy management unit 300 controls the on-off state of the circuit between the range extender 200, the load 500 and the lithium battery system 400, specifically:

when the preset power of the range extender 200 is exactly equal to the power required by the load 500, the first switch K1 of the energy management unit 300 is closed, the circuit between the range extender 200 and the load 500 is conducted, and the second switch K2 opens the circuit between the lithium battery system 400 and the load 500, so that the range extender 200 independently supplies power to the load 500; when the working condition of the load 500 changes and the preset power of the range extender 200 is greater than the power required by the load 500, the second switch K2 of the energy management unit is closed, and a circuit between the range extender 200 and the lithium battery system 400 is switched on through the first switch K1 and the second switch K2, so that the range extender 200 supplies power to the load 500 and outputs redundant power to the lithium battery system 400 to charge the lithium battery system 400; when the working condition of the load 500 changes and the preset power of the range extender 200 is smaller than the power required by the load 500, the second switch K2 of the energy management unit is also closed, and a circuit between the lithium battery system 400 and the load 500 is conducted, so that the lithium battery system 400 supplies power to the load 500 while the range extender 200 supplies power to the load 500, and the power insufficient by the load 500 is supplemented.

In the embodiment of the application, the range extender 200 supplies power to the load 500 according to the preset power, when the power required by the load 500 is the same as the preset power of the range extender 200, the range extender 200 independently supplies power to the load 500, energy conversion consumption in the charging and discharging process of the energy storage system is avoided, the energy efficiency of the range extender 200 is improved, when the working condition of the load 500 is unstable and higher working power is required, the required power is supplemented to the load 500 through the lithium battery system 400, when the power required by the load 500 is smaller than the preset power of the range extender 200, the redundant power is supplied to the lithium battery system 400 for charging, the range extender 200 can always work in a high-efficiency energy-saving area, and the working energy efficiency of the range extender 200 is greatly improved.

In some embodiments of the present application, the lithium battery system 400 is also used to recover the feedback energy generated by the load 500 when the engineering machine is braked or decelerated.

In the embodiment of the present application, in the process that the range extender 200 supplies power to the load 500, when the engineering machinery brakes or decelerates, the load 500 generates a back electromotive force, so as to generate feedback energy, the feedback energy of the load 500 is recovered to the lithium battery system 400 through the second switch K2, and at this time, the power output by the range extender 200 is also supplied to the lithium battery system 400 through the first switch K1 and the second switch K2.

In some embodiments of the present application, the lithium battery system 400 is configured to separately supply power to the load 500 when the power of the lithium battery system 400 reaches a first preset power.

In the embodiment of the present application, the first preset electric quantity of the lithium battery system 400 is set to be a full electric quantity, that is, the electric quantity percentage is 100%, when the electric quantity percentage of the lithium battery system 400 reaches 100%, that is, when the lithium battery system is fully charged, the first switch K1 of the energy management unit 300 disconnects the circuit between the range extender 200 and the load 500, so that the range extender 200 stops supplying power to the load 500, or the range extender 200 stops supplying power to the load 500, and at this time, the lithium battery system 400 independently supplies working electric energy to the load 500 through the closed second switch K2. When the power of the lithium battery system 400 is reduced to a preset minimum power, for example, 10%, the range extender 200 is restarted to supply power to the load 500 through the first switch K1, and the process is repeated. It should be noted that the first preset electric quantity and the preset minimum electric quantity of the lithium battery system 400 may be set according to the performance or the application scenario of the lithium battery system, which is provided in this embodiment as an example only, and the specific numerical value is not limited here.

In some embodiments of the present application, the lithium battery system 400 is further configured to provide starting power for the range extender 200 when the range extender 200 is started, so that the range extender 200 can quickly reach the energy-efficient region to operate.

In the embodiment of the application, when the range extender 200 is started, the first switch K1 and the second switch K2 of the energy management unit 300 are closed, the lithium battery system 400 supplies power to the generator through the bidirectional ac/dc converter, so that the generator is used as a starting motor to drive the engine to reach a required rotating speed in a short time, and the range extender 200 starts to supply power to the load 500 at a high energy consumption stage when the range extender 200 is started, thereby saving energy.

In some embodiments of the present application, the engineering machinery energy management system further includes a charging device 900 in communication connection with the central controller 100, the charging device 900 is electrically connected to the lithium battery system 400, the charging device 900 in this embodiment may be an external commercial power charging pile, a mobile charging device, or another energy storage device, the charging device 900 may alternately charge the lithium battery system 400 with the range extender 200, or independently charge the lithium battery system 400, or charge the lithium battery system 400 when the range extender 200 fails, or when the lithium battery system 400 is idle.

As shown in fig. 2, in some embodiments of the present application, the engineering machinery energy management system further includes a super capacitor system 600 and a unidirectional conducting device 700, the central controller 100 is further configured to control the super capacitor system 600 and the unidirectional conducting device 700, respectively, the super capacitor system 600 is electrically connected to the energy management unit 300, the super capacitor system 600 is electrically connected to the lithium battery system 400 through the unidirectional conducting device 700, a unidirectional conducting direction of the unidirectional conducting device 700 is a direction from the super capacitor system 600 to the lithium battery system 400, where:

when the preset power of the range extender 200 is greater than the power required by the load 500, the energy management unit 300 simultaneously conducts the circuit between the range extender 200 and the supercapacitor 600 and the circuit between the range extender 200 and the load 500, so that the range extender 200 simultaneously supplies power to the load 500 and the supercapacitor system 600, and when the electric quantity of the supercapacitor system 600 reaches a second preset electric quantity, the supercapacitor system 600 supplies the electric quantity greater than the second preset electric quantity to the lithium battery system 400 through the one-way conduction device 700 for charging;

when the preset power is smaller than the power required by the load 500, the energy management unit 300 simultaneously turns on the circuit between the super capacitor system 600 and the load 500 and the circuit between the range extender 200 and the load 500, so that the range extender 200 and the super capacitor system 600 simultaneously supply power to the load 500.

In this embodiment, the energy management unit 300 further includes a third switch K3, the super capacitor system 600 is electrically connected to the load 500 through the third switch K3, and when the preset power of the range extender 200 is greater than the power required by the load 500 during the process of supplying power to the load 500 by the range extender 200, the third switch K3 of the energy management unit 300 is closed, so as to open the circuit between the super capacitor system 600 and the range extender 200, and the extra electric energy is stored in the super capacitor system 600 through the third switch K3. The second preset electric quantity of the super capacitor system 600 is set to be full electric quantity, that is, the electric quantity percentage is 100%, and when the electric quantity percentage of the super capacitor system 600 reaches 100%, the excessive electric quantity is supplied to the lithium battery system 400 through the one-way conduction device 700 to charge the lithium battery system 400.

When the preset power of the range extender 200 is smaller than the power required by the load 500, the third switch K3 of the energy management unit 300 is also closed, the circuit between the super capacitor system 600 and the load 500 is turned on, so that the load 500 is simultaneously supplied with the range extender 200 and the super capacitor system 600, and if the sum of the powers provided by the super capacitor system 600 and the range extender 200 is still smaller than the power required by the load 500, the second switch K2 of the energy management unit 300 is closed, the circuit between the lithium battery system 400 and the load 500 is turned on, so that the lithium battery system 400, the super capacitor system 600 and the range extender 200 simultaneously supply power to the load 500.

It should be noted that the second preset amount of power in this embodiment may be set according to the voltage difference of the unidirectional conducting device 700. The setting may also be performed according to the performance or application scenario of the super capacitor system, which is provided in this embodiment as an example only, and the specific value is not limited here. The unidirectional conducting device 700 in this embodiment may be a unidirectional voltage (DC-DC) converter, a high-power diode, or a unidirectional Current transmission device capable of realizing Current boosting/voltage reduction. Due to the existence of the unidirectional flux device 700, the electric energy can only flow from the super capacitor system 600 to the lithium battery system 400, and cannot flow in the reverse direction.

Because the cycle number of a life cycle of the lithium battery is limited, and the cycle number of the super capacitor can reach 100 ten thousand, the super capacitor has the advantages of high power and long cycle life, the super capacitor system 600 can replace the peak clipping and valley filling functions of the lithium battery system 400, the lithium battery system 400 is prevented from being charged and discharged frequently, the service life of the lithium battery system 400 is prolonged, and the super capacitor has better low-temperature performance than the lithium battery and can provide enough power when being started at low temperature. The super capacitor system 600 in this embodiment may be obtained by connecting a plurality of super capacitor units in series and in parallel, or may be another high power energy storage system, such as a flywheel energy storage system, and the like, and other schemes that are the same as or similar to the principle of this embodiment also belong to the protection scope of this application, for example, the scheme of this embodiment may also be implemented by reasonably setting the parameters of the range extender 200, the super capacitor system 600, and the lithium battery system 400.

In this embodiment, the super capacitor system 600 is further configured to recover the feedback energy generated by the load 500 during braking or deceleration of the engineering machine, and similarly, when the electric quantity of the super capacitor system 600 reaches the second preset electric quantity, the excess feedback energy is also supplied to the lithium battery system 400 through the one-way conduction device 700 to charge the lithium battery system 400.

When the electric quantity of the lithium battery system 400 reaches the first preset electric quantity, that is, the lithium battery system 400 is fully charged, the first switch K1 of the energy management unit 300 disconnects the circuit between the range extender 200 and the load 500, or the range extender 200 stops operating, the third switch K3 disconnects the circuit between the super capacitor system 600 and the load 500, so that the range extender 200 and the super capacitor system 600 stop supplying power to the load 500, at this time, the second switch K2 of the energy management unit 300 is closed, the circuit between the lithium battery system 400 and the load 500 is conducted, and the lithium battery system 400 independently supplies working electric energy to the load 500.

In the embodiment of the application, when the range extender 200 fails, the first switch K1 of the energy management unit 300 is opened, the second switch K2 and the third switch K3 are closed, and the power supply system composed of the lithium battery system 400 and the super capacitor system 600 reasonably distributes electric quantity to provide working electric energy for the load 500 according to the power required by the load 500.

In the embodiment of the present application, in the process that the lithium battery system 400 independently supplies power to the load 500, when the engineering machine brakes or decelerates, the load 500 generates a back electromotive force, so as to generate feedback energy, and the feedback energy of the load 500 is recycled to the lithium battery system 400 through the second switch K2.

In the embodiment of the application, if the lithium battery system 400 and the super capacitor system 600 have a fault, the second switch K2 and the third switch K3 of the energy management unit 300 are opened, the first switch K1 is closed, and a circuit between the range extender 200 and the load 600 is conducted, so that the range extender 200 independently supplies power to the load 600; if the lithium battery system 400 has a fault, the second switch K2 of the energy management unit 300 is opened, the first switch K1 and the third switch K3 are closed, and a circuit between the range extender 200 and the load 600 and a circuit between the super capacitor system 600 and the load 500 are conducted, so that the range extender 200 and the super capacitor system 600 supply power to the load 600; if the super capacitor system 600 fails, the third switch K3 of the energy management unit 300 is opened, the first switch K1 and the second switch K2 are closed, and a circuit between the range extender 200 and the load 600 and a circuit between the lithium battery system 400 and the load 500 are conducted, so that the range extender 200 and the lithium battery system 400 supply power to the load 600.

As shown in fig. 3, in some embodiments of the present application, the work machine energy management system further includes a bidirectional voltage converter 800 communicatively connected to the central controller 100, the bidirectional voltage converter 800 being connected to the super capacitor system 400 and the energy management unit 300, respectively, wherein:

the bidirectional voltage converter 800 is used for stepping down the input voltage of the super capacitor system 800 and stepping up the output voltage of the super capacitor system 600.

In the embodiment of the present application, the super capacitor system 600 is formed by connecting a plurality of super capacitor units in series and in parallel, and the bidirectional voltage converter 800 may implement bidirectional up/down conversion, which may be a BOOST circuit or a bidirectional up/down converter having a BOOST (BOOST)/BUCK (BUCK) circuit topology. In this embodiment, the unidirectional conducting device 700 may be a unidirectional voltage converter with a unidirectional boosting function, or may be a unidirectional Boosting (BOOST) circuit, and BOOSTs the voltage input from the super capacitor system 800 to the lithium battery system 400. The third switch K3 of the energy management unit 300 is electrically connected to the super capacitor system 600 through the bidirectional voltage converter 800, and since the bidirectional voltage converter 800 can step down the voltage input to the super capacitor system 600 by the energy management unit 300 and step up the voltage output to the energy management unit 300 by the super capacitor system 600, the voltage of the super capacitor system 600 can be reduced and the voltage of the whole engineering machinery energy management system can be satisfied, the number of the super capacitors connected in series and parallel can be reduced, and since the super capacitors are expensive, the cost of the super capacitor system 600 can be reduced, and further the cost of the whole engineering machinery energy management system can be reduced.

It should be noted that, in the embodiment of the present application, the manner of controlling the on/off of the circuit through each switch of the energy management unit 300 is only one manner of implementing the present application, and other manners of controlling the circuit according to the same or similar principle that can implement the on/off of the circuit are also applicable to the embodiment of the present application. In addition, it should be understood by those skilled in the art that, in order to implement the embodiment of the present application, the amount of power of the lithium battery system 400 is sufficient to supply power to the load 500 together with the range extender 200, and specifically, the range extender 200 charges the lithium battery system 400 with a larger amount of power than the amount of power released by the lithium battery system 400 or charges the lithium battery system 400 through the charging device 900 when the amount of power of the lithium battery system 400 is insufficient, so as to ensure that the system operates normally.

In order to better implement the engineering machinery energy management system in the embodiment of the present application, on the basis of the engineering machinery energy management system, an engineering machinery energy management method is further provided in the embodiment of the present application, the engineering machinery energy management method is applied to a central controller 100, the central controller 100 is located in the engineering machinery energy management system, as shown in fig. 4, the engineering machinery energy management method includes:

401. the range extender 200 is controlled to supply power to the load 500 according to the preset power, and in the power supply process, the preset power and the power required by the load 500 are detected.

402. When the preset power of the range extender 200 is greater than the power required by the load 500, controlling the energy management unit 300 to conduct a circuit between the range extender 200 and the lithium battery system 400, so that the range extender 200 supplies power to the load 500 and charges the lithium battery system 400 at the same time;

when the preset power of the range extender 200 is less than the power required by the load 500, the energy management unit 300 is controlled to simultaneously turn on the circuits between the range extender 200 and the load 500 and between the lithium battery system 400 and the load 500, so that the range extender 200 and the lithium battery system 400 simultaneously supply power to the load 500.

In the embodiment of the present application, the preset power of the range extender 200 is set in the efficient energy-saving region of the range extender 200, so that the range extender 200 can stably output with the lowest energy consumption and the highest efficiency. When the preset power of the range extender 200 is equal to the power required by the load 500, the first switch K1 of the energy management unit 300 is closed, and the circuit between the range extender 200 and the load 500 is conducted, so that the range extender 200 provides the load 500 with the working electric energy according to the preset power. When the preset power of the range extender 200 is greater than the power required by the load 500, the second switch K2 of the energy management unit 300 is closed, and a circuit between the range extender 200 and the lithium battery system 400 is conducted, so that the range extender 200 supplies surplus electric energy to the lithium battery system 400 while supplying power to the load 500, and the lithium battery system 400 is charged. When the preset power of the range extender 200 is smaller than the power required by the load 500, the second switch K2 of the energy management unit 300 is closed, the circuit between the range extender 200 and the load 500 and the circuit between the lithium battery system 400 and the load 500 are both in a conducting state, the range extender 200 supplies power to the load 500, and meanwhile, the lithium battery system 400 supplies power to the load 500 in a supplementing manner, so that the load 500 can work normally.

In some embodiments of the present disclosure, when the engineering machine decelerates or brakes, the central controller 100 obtains the deceleration command or the braking command, the load 500 generates a back electromotive force, so as to generate feedback energy, and the feedback energy of the load 500 is recycled to the lithium battery system 400 through the second switch K2.

In some embodiments of the present application, when the electric quantity of the lithium battery system 400 reaches a full electric quantity state, the central controller 100 obtains an electric quantity full instruction, where the electric quantity full instruction is used to indicate that the electric quantity of the lithium battery system 400 reaches a first preset electric quantity, that is, a full electric quantity; according to the power full command, the central controller 100 controls the range extender 200 to stop working, and controls the first switch K1 of the energy management unit 300 to disconnect the circuit between the range extender 200 and the load 500 and to connect the circuit between the lithium battery system 400 and the load 500, so that the lithium battery system 400 independently supplies power to the load 500.

In some embodiments of the present application, when the range extender 200 is started, the central controller 100 obtains a start instruction of the range extender; according to the range extender starting instruction, the first switch K1 and the second switch K2 of the energy management unit 300 are controlled to be closed, a circuit between the lithium battery system 400 and the range extender 200 is conducted, the lithium battery system 400 supplies power to the generator through the bidirectional alternating current-direct current converter, the generator serves as a starting motor to drive the engine to reach the required rotating speed in a short time, the range extender 200 is started successfully, the load 500 starts to be supplied with power, the high energy consumption stage when the engine is started can be avoided, and energy is saved.

In some embodiments of the present application, the engineering machinery energy management system further includes a one-way conduction device 700 and a super capacitor system 600, the central controller 100 is further configured to control the super capacitor system 600 and the one-way conduction device 700 respectively, the super capacitor system 600 is electrically connected to the energy management unit 300, the super capacitor system 600 is electrically connected to the lithium battery system 400 through the one-way conduction device 700, the one-way conduction direction of the one-way conduction device 700 is a direction from the super capacitor system 600 to the lithium battery system 400, and the on-off state of the circuits between the range extender 200, the load 500 and the lithium battery system 400 is controlled, so that the range extender 200 charges the lithium battery system 400 while supplying power to the load 500, including:

the energy management unit 300 is controlled to simultaneously conduct the circuit between the range extender 200 and the super capacitor system 600 and the circuit between the range extender 200 and the load 500, so that the range extender 200 supplies power to the load 500 and simultaneously charges the super capacitor system 600, and when the electric quantity of the super capacitor system 600 reaches a second preset electric quantity, the super capacitor system 600 is controlled to supply the electric quantity of the super capacitor system 600, which is larger than the second preset electric quantity, to the lithium battery system 400 through the one-way conduction device 700 for charging through the one-way conduction device 700.

In this embodiment, the super capacitor system 600 is electrically connected to the load 500 through the third switch K3 of the energy management unit 300, and when the range extender 200 supplies power to the load 500 and the preset power of the range extender 200 is greater than the power required by the load 500, the third switch K3 of the energy management unit 300 is closed, so as to conduct the circuit between the super capacitor system 600 and the range extender 200, and the extra electric energy is stored in the super capacitor system 600 through the third switch K3. The second preset electric quantity of the super capacitor system 600 is set to be full electric quantity, that is, the electric quantity percentage is 100%, and when the electric quantity percentage of the super capacitor system 600 reaches 100%, the excessive electric quantity is supplied to the lithium battery system 400 through the one-way conduction device 700 to charge the lithium battery system 400. The unidirectional conducting device 700 in this embodiment may be a unidirectional voltage (DC-DC) converter, a high-power diode, or a unidirectional Current transmission device capable of realizing Current step-up/step-down. Due to the existence of the unidirectional flux device 700, the electric energy can only flow from the super capacitor system 600 to the lithium battery system 400, but can not flow in the reverse direction.

In addition, in this embodiment of the application, when the preset power of the range extender 200 is smaller than the power required by the load 500, the third switch of the energy management unit 300 is also closed K3, so as to conduct the circuit between the super capacitor system 600 and the load 500, so that the range extender 200 and the super capacitor system 600 simultaneously supply power to the load 500, and if the sum of the powers provided by the super capacitor system 600 and the range extender 200 is still smaller than the power required by the load 500, the second switch K2 of the energy management unit 300 is closed, so as to conduct the circuit between the lithium battery system 400 and the load 500, so that the lithium battery system 400, the super capacitor system 600, and the range extender 200 simultaneously supply power to the load 500.

In some embodiments of the present application, a bidirectional voltage converter 800 is disposed between the super capacitor system 600 and the load 500, and the bidirectional voltage converter 800 is communicatively connected to the central controller 100 for stepping down the input voltage of the super capacitor system 800 and stepping up the output voltage of the super capacitor system 600.

In the embodiment of the present application, the super capacitor system 600 is formed by connecting a plurality of super capacitor units in series and in parallel, and the bidirectional voltage converter 800 may implement bidirectional up/down conversion, which may be a BOOST/down circuit or a bidirectional up/down converter having a BOOST (BOOST)/BUCK (BUCK) circuit topology. In this embodiment, the unidirectional conducting device 700 may be a unidirectional voltage converter with a unidirectional boosting function, or may be a unidirectional Boosting (BOOST) circuit, and BOOSTs the voltage input from the super capacitor system 800 to the lithium battery system 400. The third switch K3 of the energy management unit 300 is electrically connected to the super capacitor system 600 through the bidirectional voltage converter 800, and since the bidirectional voltage converter 800 can step down the voltage input to the super capacitor system 600 by the energy management unit 300 and step up the voltage output to the energy management unit 300 by the super capacitor system 600, the voltage of the super capacitor system 600 can be reduced and the voltage of the whole engineering mechanical energy management system can be satisfied, the number of the super capacitors connected in series and parallel can be reduced, the cost of the super capacitor system 600 can be reduced, and the cost of the whole engineering mechanical energy management system can be further reduced.

In order to better implement the engineering machine energy management method in the embodiment of the present application, based on the engineering machine energy management method, an engineering machine energy management apparatus is further provided in the embodiment of the present application, the engineering machine energy management apparatus is applied to a central controller 100, the central controller 100 is located in an engineering machine energy management system, as shown in fig. 5, the engineering machine energy management apparatus 5000 includes:

the power detection module 501 is configured to control the range extender 200 to supply power to the load 500 according to a preset power, and detect the preset power and a power required by the load 500 in a power supply process;

the power supply control module 502 is used for controlling the on-off state of circuits between the range extender 200, the load 500 and the lithium battery system 400 when the preset power is larger than the power required by the load 500, so that the range extender 200 supplies power to the load 500 and charges the lithium battery system 400 at the same time;

when the preset power is smaller than the power required by the load 500, the on-off state of the circuit between the range extender 200, the load 500 and the lithium battery system 400 is controlled, so that the range extender 200 and the lithium battery system 400 simultaneously supply power to the load 500.

It should be understood that the apparatus shown in fig. 5 and its modules may be implemented in various ways. For example, in some embodiments, an apparatus and its modules may be implemented by hardware, software, or a combination of software and hardware. Wherein the hardware portion may be implemented using dedicated logic; the software portions may be stored in a memory for execution by a suitable instruction execution system, such as a microprocessor or specially designed hardware. Those skilled in the art will appreciate that the methods and systems described above may be implemented using computer executable instructions and/or embodied in processor control code, such code being provided, for example, on a carrier medium such as a diskette, CD-or DVD-ROM, a programmable memory such as read-only memory (firmware), or a data carrier such as an optical or electronic signal carrier. The apparatus and its modules of the present application may be implemented not only by hardware circuits such as very large scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc., but also by software executed by various types of processors, for example, or by a combination of the above hardware circuits and software (e.g., firmware).

It should be noted that the above description of the apparatus and its modules is for convenience only and should not limit the present application to the scope of the illustrated embodiments. It will be appreciated by those skilled in the art that, given the teachings of the present system, any combination of modules or sub-system configurations may be used to connect to other modules without departing from such teachings. For example, the power detection module 501 and the power supply control module 502 disclosed in fig. 5 may be different modules in a system, or may be a module that implements the functions of two or more modules, for example, the power detection module 501 and the power supply control module 502 may be two modules having detection and control functions, respectively, or may be a module having both detection and control functions.

The embodiment of the application also provides engineering machinery energy management equipment, which integrates any engineering machinery energy management device provided by the embodiment of the application. As shown in fig. 6, it shows a schematic structural diagram of the apparatus according to the embodiment of the present application, specifically:

the apparatus may include components such as a processor 601 of one or more processing cores, memory 602 of one or more computer-readable storage media, a power supply 603, and an input unit 604. The processor 601 corresponds to the central controller 100 and the power supply 603 may be used to provide operating voltages for the central controller 100, the energy management unit 300, etc. Those skilled in the art will appreciate that the configuration of the apparatus shown in fig. 6 is not intended to be limiting of the apparatus and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components. Wherein:

the processor 601 is a control center of the apparatus, connects various parts of the entire apparatus using various interfaces and lines, and performs various functions of the apparatus and processes data by running or executing software programs and/or modules stored in the memory 602 and calling data stored in the memory 602, thereby performing overall monitoring of the apparatus. Optionally, processor 601 may include one or more processing cores; the Processor 601 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, preferably the processor 601 may integrate an application processor, which handles primarily the operating system, user interfaces, application programs, etc., and a modem processor, which handles primarily wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 601.

The memory 602 may be used to store software programs and modules, and the processor 601 executes various functional applications and data processing by operating the software programs and modules stored in the memory 602. The memory 602 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to the use of the central controller 100, and the like. Further, the memory 602 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. Accordingly, the memory 602 may also include a memory controller to provide the processor 601 with access to the memory 602.

The device further comprises a power supply 603 for supplying power to the various components, and preferably, the power supply 603 is logically connected to the processor 601 through a power management system, so that functions of managing charging, discharging, and power consumption are realized through the power management system. The power supply 603 may also include any component of one or more dc or ac power sources, recharging systems, power failure detection circuitry, power converters or inverters, power status indicators, and the like.

The device may also include an input unit 604, which input unit 604 may be used to receive input numeric or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

Although not shown, the apparatus may further include a display unit and the like, which will not be described in detail herein. Specifically, in this embodiment, the processor 601 in the device loads the executable file corresponding to the process of one or more application programs into the memory 602 according to the following instructions, and the processor 601 runs the application programs stored in the memory 602, thereby implementing various functions as follows:

controlling the range extender 200 to supply power to the load 500 according to the preset power, and detecting the preset power and the power required by the load 500 in the power supply process;

when the preset power of the range extender 200 is greater than the power required by the load 500, controlling the energy management unit 300 to conduct a circuit between the range extender 200 and the lithium battery system 400, so that the range extender 200 charges the load 500 and the lithium battery system 400 at the same time;

It will be understood by those skilled in the art that all or part of the steps of the methods of the above embodiments may be performed by instructions or by associated hardware controlled by the instructions, which may be stored in a computer readable storage medium and loaded and executed by a processor.

To this end, an embodiment of the present application provides a computer-readable storage medium, which may include: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like. The energy management system comprises a processor, a computer program and a computer program, wherein the computer program is stored on the computer program and is loaded by the processor to execute the steps of any engineering machinery energy management method provided by the embodiment of the application. For example, the computer program may be loaded by a processor to perform the steps of:

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and parts that are not described in detail in a certain embodiment may refer to the above detailed descriptions of other embodiments, and are not described herein again.

In a specific implementation, each unit or structure may be implemented as an independent entity, or may be combined arbitrarily to be implemented as one or several entities, and the specific implementation of each unit or structure may refer to the foregoing embodiments, which are not described herein again.

The engineering machinery energy management system, the method, the device and the storage medium provided by the embodiment of the application are described in detail, a specific example is applied to illustrate the principle and the implementation of the application, and the description of the embodiment is only used for helping to understand the method and the core idea of the application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. An energy management system of engineering machinery, which is characterized by comprising a central controller, a range extender, an energy management unit and a lithium battery system, wherein the energy management unit is used for connecting a load, and the load is in communication connection with the central controller, and the energy management system comprises:

the range extender supplies power to the load according to preset power, and in the power supply process, when the preset power is larger than the power required by the load, the range extender supplies power to the load and charges the lithium battery system;

the energy management unit is used for the increase journey ware does the load power supply is simultaneously for the in-process that lithium battery system charges, perhaps is in lithium battery system with the increase journey ware is simultaneously for the in-process of load power supply, control the increase journey ware the load with the break-make state of the circuit between two liang of lithium battery system to accomplish the power supply.

2. The system of claim 1, wherein the lithium battery system is further configured to recover regenerative energy from the load during braking or deceleration of the work machine.

3. The system of claim 1, wherein the lithium battery system is configured to individually power the load when the battery capacity of the lithium battery system reaches a first predetermined capacity.

4. The system of claim 1, wherein the lithium battery system is further configured to provide starting power to the range extender when the range extender is started.

5. The system of claim 1, further comprising a super capacitor system and a unidirectional conducting device, wherein the central controller is further configured to control the super capacitor system and the unidirectional conducting device, respectively, the super capacitor system is electrically connected to the energy management unit, the super capacitor system is electrically connected to the lithium battery system through the unidirectional conducting device, and a unidirectional conducting direction of the unidirectional conducting device is a direction from the super capacitor system to the lithium battery system, wherein:

6. The system of claim 5, further comprising a bi-directional voltage converter communicatively coupled to the central controller, the bi-directional voltage converter being electrically coupled to the supercapacitor system and the energy management unit, respectively, wherein:

7. A method for managing energy of engineering machinery is applied to a central controller, the central controller is located in an engineering machinery energy management system, the engineering machinery energy management system further comprises a range extender, an energy management unit and a lithium battery system, the energy management unit is used for being connected with a load, and the load is in communication connection with the central controller, and the method comprises the following steps: controlling the range extender to supply power to the load according to preset power, and detecting the preset power and the power required by the load in the power supply process;

8. The method of claim 7, wherein the engineering machinery energy management system further comprises a one-way conduction device and a super capacitor system, the central controller is further configured to control the super capacitor system and the one-way conduction device, the super capacitor system is electrically connected to the energy management unit, the super capacitor system is electrically connected to the lithium battery system through the one-way conduction device, a one-way conduction direction of the one-way conduction device is a direction from the super capacitor system to the lithium battery system, and the on-off state of a circuit between the range extender, the load and the lithium battery system is controlled, so that the range extender supplies power to the load and charges the lithium battery system at the same time, comprising:

and controlling the energy management unit to simultaneously conduct the circuit between the range extender and the super capacitor system, the range extender and the circuit between the loads, so that the range extender supplies power to the loads and simultaneously charges the super capacitor system, and after the electric quantity of the super capacitor system reaches a second preset electric quantity, controlling the super capacitor system to enable the electric quantity of the super capacitor system to be more than the electric quantity of the second preset electric quantity to be supplied to the lithium battery system through the one-way conduction device.

9. A construction machine energy management device, comprising:

the power detection module is used for controlling the range extender to supply power to the load according to preset power and detecting the preset power and the power required by the load in the power supply process;

10. A computer-readable storage medium, having stored thereon a computer program which is loaded by a processor to perform the steps of the method for energy management of a working machine of claim 7 or 8.