CN114194070A - Energy management method and device of power system and engineering machinery - Google Patents
Energy management method and device of power system and engineering machinery Download PDFInfo
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- CN114194070A CN114194070A CN202111627253.8A CN202111627253A CN114194070A CN 114194070 A CN114194070 A CN 114194070A CN 202111627253 A CN202111627253 A CN 202111627253A CN 114194070 A CN114194070 A CN 114194070A
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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
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
- B60L58/14—Preventing excessive discharging
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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
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
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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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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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
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
- B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
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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
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
- B60L58/15—Preventing overcharging
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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
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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
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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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
- Y02T10/72—Electric energy management in electromobility
-
- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides an energy management method and device of a power system and engineering machinery, comprising the following steps: determining the running condition of the whole vehicle; under the working discharge working condition, acquiring the discharge power requirement of the whole vehicle; adjusting the output power of a vehicle-mounted charger and a generator to ensure that the discharge power requirement of the whole vehicle is smaller than the discharge power limit of the whole vehicle; under the working charging condition, acquiring the feedback power requirement of the whole vehicle; and adjusting the output power of the generator and the vehicle-mounted charger, so that the feedback power requirement of the whole vehicle is smaller than the charging power limit of the whole vehicle. The energy management method, the energy management device and the engineering machinery of the power system provided by the invention have the advantages that the discharge power and the charge power of each load are reasonably distributed based on the running condition of the whole vehicle and the charge/discharge power limit of the whole vehicle, so that the operation requirement of the whole vehicle is met, the occurrence of the fault condition of the battery due to overcharge or overdischarge of the battery is avoided, the engine can always work at the highest efficiency point, and the effects of saving energy and reducing emission can be achieved.
Description
Technical Field
The invention relates to the technical field of energy management of storage batteries, in particular to an energy management method and device of a power system and engineering machinery.
Background
At present, the power of the traditional engineering machinery during operation is from an engine, the working condition of the engine mainly depends on load, the working condition of the engine is unstable, and the efficiency is low. And because most of the engineering machinery adopting new energy adopts the battery as a power source, the vehicle can preferentially use electric energy during operation, and the effects of saving energy and reducing emission are achieved, so that the effect of protecting the environment is achieved. In the actual operation process of the engineering machinery, the gravitational potential energy, the kinetic energy and the like during operation can be recovered, so that the energy consumption is further reduced. Meanwhile, after the battery is used as a power source, the response speed of the motor is much higher than that of the engine, and the operation performance of the vehicle can be improved. Therefore, how to manage the energy of the power system is very important. The method not only has the relation of energy conservation and emission reduction, but also plays an absolute role in improving the vehicle operation performance.
At present, a motor on a new energy machine generally adopts a torque control mode, and energy management of a power system is performed by controlling a torque request, so that over-discharge or over-charge protection of a battery is realized.
However, the torque control method requires accurate knowledge of the motor system efficiency and the motor speed, and then calculates the torque limit based on the power limit. Because the motor voltage, the motor controller temperature, the motor temperature and the like all affect the efficiency, the efficiency of a motor system is difficult to accurately know, and a large number of motor tests are required. In addition, the torque limit is generally added with a filtering algorithm, which further causes a delay in the torque limit, such that an overcharge or an overdischarge condition of the battery sometimes occurs.
Disclosure of Invention
The invention provides an energy management method and device of a power system and engineering machinery, which are used for solving or improving the defects of the prior art that the energy management of the power system is carried out by adopting a torque control mode to a certain extent and effectively ensuring the occurrence of the phenomenon of over-charge or over-discharge of a battery.
In a first aspect, the present invention provides a method for energy management of a power system, comprising:
acquiring finished automobile discharge power limit and finished automobile charging power limit, and determining finished automobile running conditions;
acquiring the discharge power requirement of the whole vehicle when the operation condition of the whole vehicle is determined to be in the operation discharge condition; adjusting the output power of at least one of a vehicle-mounted charger and a generator to ensure that the discharge power requirement of the whole vehicle is smaller than the discharge power limit of the whole vehicle;
acquiring the feedback power requirement of the whole vehicle when the operation working condition of the whole vehicle is determined to be in the operation charging working condition; and adjusting the output power of at least one of the generator and the vehicle-mounted charger, so that the feedback power requirement of the whole vehicle is smaller than the charging power limit of the whole vehicle.
According to the energy management method of the power system provided by the invention, the adjusting of the output power of at least one of the vehicle-mounted charger and the generator to enable the discharge power requirement of the whole vehicle to be smaller than the discharge power limit of the whole vehicle comprises the following steps:
comparing the discharge power requirement of the whole vehicle with the discharge power limit of the whole vehicle;
under the condition that the discharge power requirement of the whole vehicle is determined to be larger than or equal to the discharge power limit of the whole vehicle, the output power of the vehicle-mounted charger is gradually increased so as to gradually increase the discharge power limit of the whole vehicle until the discharge power requirement of the whole vehicle is smaller than the discharge power limit of the whole vehicle or the output power of the vehicle-mounted charger is increased to the maximum output power.
According to the energy management method of the power system provided by the invention, after the output power of the vehicle-mounted charger is increased to the maximum output power, the method further comprises the following steps:
keeping the vehicle-mounted charger outputting the maximum output power;
and gradually increasing the output power of the generator to further increase the finished automobile discharge power limit until the finished automobile discharge power requirement is smaller than the finished automobile discharge power limit.
According to the energy management method of the power system provided by the invention, the adjusting of the output power of at least one of the generator and the vehicle-mounted charger to enable the feedback power demand of the whole vehicle to be smaller than the charging power limit of the whole vehicle comprises the following steps:
determining feedback charging power limit according to the finished automobile charging power limit and the load charging power limit;
comparing the feedback power requirement of the whole vehicle with the feedback charging power limit;
and gradually reducing the output power of the vehicle-mounted charger under the condition that the feedback power demand of the whole vehicle is determined to be greater than or equal to the feedback charging power limit and the generator is in a non-power generation state so as to gradually increase the feedback charging power limit until the feedback power demand of the whole vehicle is smaller than the feedback charging power limit.
The invention provides an energy management method of a power system, which further comprises the following steps: and under the condition that the feedback power demand of the whole vehicle is determined to be greater than or equal to the feedback charging power limit and the generator is in a power generation state, gradually reducing the output power of the generator to gradually increase the feedback charging power limit until the feedback power demand of the whole vehicle is smaller than the feedback charging power limit or the output power of the generator is reduced to the minimum output power.
According to the energy management method of the power system provided by the invention, under the condition that the output power of the generator is reduced to the minimum output power, the method further comprises the following steps:
maintaining the output power of the generator at a minimum output power;
and reducing the output power of the vehicle-mounted charger to further increase the feedback charging power limit until the feedback power requirement of the whole vehicle is less than the feedback charging power limit or the output power of the vehicle-mounted charger is reduced to 0.
According to the energy management method of the power system provided by the invention, under the condition that the output power of the vehicle-mounted charger is reduced to 0, the method further comprises the following steps:
re-determining current back-charging power limit
If the feedback power requirement of the whole vehicle is greater than or equal to the current feedback charging power limit, keeping the output power of the vehicle-mounted charger to be 0;
and adjusting the rotating speed of an oil pump motor and the opening of the energy discharging hydraulic valve body to increase the charging power limit of the whole vehicle, and further increase the feedback charging power limit, so that the feedback power requirement of the whole vehicle is smaller than the adjusted feedback charging power limit.
According to the energy management method of the power system provided by the invention, after the operation condition of the whole vehicle is determined to be under the operation discharge condition and the discharge power requirement of the whole vehicle is acquired, the method further comprises the following steps: distributing discharge power for each high-voltage load part according to a preset discharge power distribution priority list, and adjusting the discharge power limit of the whole vehicle according to a distribution result;
after the whole vehicle feedback power requirement is acquired under the condition that the whole vehicle running condition is determined to be in the operation charging condition, the method further comprises the following steps: and distributing charging power for each high-voltage load according to a preset charging power distribution priority list, and adjusting load charging power limit according to a distribution result so as to adjust feedback charging power limit by combining the charging power limit of the whole vehicle.
In a second aspect, the present invention also provides an energy management device for a power system, comprising: information acquisition unit, discharge management unit and charge management unit, wherein:
the information acquisition unit is used for acquiring the finished automobile discharging power limit and the finished automobile charging power limit and determining the finished automobile running condition;
the discharge management unit is used for acquiring the discharge power requirement of the whole vehicle when the running working condition of the whole vehicle is determined to be in the operation discharge working condition; adjusting the output power of at least one of a vehicle-mounted charger and a generator to ensure that the discharge power requirement of the whole vehicle is smaller than the discharge power limit of the whole vehicle;
the charging management unit is used for acquiring the feedback power requirement of the whole vehicle when the running working condition of the whole vehicle is determined to be in the working charging working condition; and adjusting the output power of at least one of the generator and the vehicle-mounted charger, so that the feedback power requirement of the whole vehicle is smaller than the charging power limit of the whole vehicle.
In a third aspect, the present invention provides a construction machine including the energy management device of the power system.
In a fourth aspect, the present invention provides an electronic device, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the steps of the energy management method of the power system as described in any one of the above.
In a fifth aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method for energy management of a powered system as described in any of the above.
The energy management method, the energy management device and the engineering machinery of the power system provided by the invention have the advantages that the discharge power and the charge power of each load are reasonably distributed based on the running condition of the whole vehicle and the charge/discharge power limit of the whole vehicle, so that the operation requirement of the whole vehicle is met, the occurrence of the fault condition of the battery due to overcharge or overdischarge of the battery is avoided, the engine can always work at the highest efficiency point, and the effects of saving energy and reducing emission can be achieved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart diagram illustrating a method for energy management of a powertrain system provided by the present invention;
FIG. 2 is a schematic diagram of a parallel hybrid power structure of a crane provided by the invention;
FIG. 3 is a flow chart illustrating an energy management method under a work charging condition according to the present invention;
FIG. 4 is a flow chart illustrating an energy management method under a discharge condition of operation according to the present invention;
FIG. 5 is a schematic diagram illustrating an exemplary configuration of an energy management device of the powertrain system of the present invention;
fig. 6 is a schematic structural diagram of an electronic device provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. 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 invention.
It should be noted that in the description of the embodiments of the present invention, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. The terms "upper", "lower", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The following describes a method and an apparatus for energy management of a power system provided by an embodiment of the present invention with reference to fig. 1-6.
FIG. 1 is a schematic flow diagram of a method for energy management of a powertrain system provided by the present invention, as shown in FIG. 1, including, but not limited to, the following steps:
step 101: and acquiring the discharge power limit and the charge power limit of the whole vehicle, and determining the running condition of the whole vehicle.
The energy management method of the power system provided by the invention is mainly suitable for parallel oil-electricity hybrid operation engineering machinery, wherein the engineering machinery can be one of excavating machinery, shoveling and transporting machinery, engineering hoisting machinery and industrial vehicles. For convenience of description, in the following description, a parallel-type oil-electric hybrid operation crane is taken as an example, and is not to be considered as a specific limitation to the scope of the present invention.
Fig. 2 is a schematic diagram of a parallel hybrid structure of a crane according to the present invention, and as shown in fig. 2, the hybrid crane mainly includes a chassis portion and a loading operation portion, wherein the power transmission of the hybrid crane is a parallel hybrid structure formed by combining an engine, a clutch, a hybrid motor (abbreviated as P2 motor) and a transmission in sequence, and energy management during crane operation is realized by an energy management system.
In the energy management method of the power system provided by the invention, the main principle for realizing energy management is as follows:
obtaining the running condition of the crane on the current whole vehicle, comprising: an operation discharge condition, an operation charge condition or a shutdown condition, etc.
Further, the discharge power limit of the whole vehicle can be calculated by integrating the discharge power limit of a Battery Management Unit (BMU) and the high-voltage load power of each high-voltage controller; and (4) integrating the charging power limit of the BMU and the high-voltage load power of each high-voltage controller to calculate the charging power limit of the whole vehicle.
Taking a crane as an example, each high voltage controller may include, but is not limited to: a DC-DC controller, a boarding compressor controller, a boarding heater controller, a hoisting motor controller, an oil pump motor controller, a rotary motor controller, a P2 motor controller and the like.
Step 102: acquiring the discharge power requirement of the whole vehicle when the operation condition of the whole vehicle is determined to be in the operation discharge condition; and adjusting the output power of at least one of the vehicle-mounted charger and the generator, so that the discharge power requirement of the whole vehicle is smaller than the discharge power limit of the whole vehicle.
When the crane is determined to be in the operation discharge working condition under the current whole vehicle operation working condition, for example: and (3) operating a hoisting motor and a rotary motor, and comprehensively calculating the discharge power requirement of the whole crane according to the throttle opening of the loading operation part, the handle opening for controlling the output of each motor device and the like under the condition that the crane lifts cargos.
Whether the over-discharge phenomenon of the battery occurs or not can be judged by judging whether the discharge power limit of the whole vehicle meets the discharge power requirement of the whole vehicle or not.
If the discharge power requirement of the whole vehicle is greater than or equal to the discharge power limit of the whole vehicle, the discharge power requirement of the whole vehicle is indicated to exceed the maximum discharge power which can be provided by the battery, and at the moment, the deficiency of the maximum discharge power which can be provided by the battery can be filled by adjusting the output power of at least one of the vehicle-mounted charger and the generator, so that the discharge power requirement of the whole vehicle is smaller than the discharge power limit of the whole vehicle.
For example, the vehicle-mounted charger may be adjusted to output a certain power to make up for the deficiency of the power that the battery can provide, or the generator may be adjusted to output a certain power to make up for the deficiency of the power that the battery can provide, or the vehicle-mounted charger and the generator may be adjusted to output powers at the same time, so that the battery does not over-discharge.
Wherein, the mode of adjusting the output power of on-vehicle machine and the generator that charges simultaneously includes two kinds, and one kind is: firstly, adjusting the output power of a vehicle-mounted charger to increase the discharge power limit of the whole vehicle, and then comparing the discharge power requirement of the whole vehicle with the adjusted discharge power limit of the whole vehicle; and if the discharge power requirement of the whole vehicle is still larger than the adjusted discharge power limit of the whole vehicle, adjusting the output power of the generator to further increase the discharge power limit of the whole vehicle until the discharge power requirement of the whole vehicle is smaller than the discharge power limit of the whole vehicle. The other is as follows: firstly, adjusting the output power of a generator to increase the discharge power limit of the whole vehicle, and then comparing the discharge power requirement of the whole vehicle with the adjusted discharge power limit of the whole vehicle; and if the discharge power requirement of the whole vehicle is still larger than the adjusted discharge power limit of the whole vehicle, adjusting the output power of the vehicle-mounted charger to further increase the discharge power limit of the whole vehicle until the discharge power requirement of the whole vehicle is smaller than the discharge power limit of the whole vehicle.
In summary, when the crane is in the operation discharging working condition, the vehicle-mounted charger and the generator can output certain power to make up for the deficiency of the power provided by the battery, so that the battery can not be over-discharged when the crane normally executes the function.
Step 103: acquiring the feedback power requirement of the whole vehicle when the operation working condition of the whole vehicle is determined to be in the operation charging working condition; and adjusting the output power of at least one of the generator and the vehicle-mounted charger, so that the feedback power requirement of the whole vehicle is smaller than the charging power limit of the whole vehicle.
When the crane is determined to be in the operation charging working condition under the current whole vehicle operation working condition, for example: under the condition that the crane jib is reset after being lifted, and under the condition that the gravity potential energy is recovered, the feedback power requirement of the whole crane can be comprehensively calculated according to the throttle opening of the crane jib operation part and the handle state for controlling the output of each motor device.
The feedback power demand of the whole vehicle can be understood as the power which needs to be recovered and is fed back by each high-voltage device.
The invention can judge whether the battery has the overcharge phenomenon by judging whether the charging power limit of the whole vehicle meets the feedback power requirement of the whole vehicle.
If the feedback power requirement of the whole vehicle is greater than or equal to the charging power limit of the whole vehicle, it indicates that the power requirement to be recovered exceeds the maximum charging power that the battery can bear, and at this time, the power for charging the battery can be reduced by reducing at least one of the output powers of the vehicle-mounted charger and the generator, so that the feedback power requirement of the whole vehicle is smaller than the charging power limit of the whole vehicle, and thus the battery cannot be overcharged, which is not described herein.
The energy management method, the energy management device and the engineering machinery of the power system provided by the invention have the advantages that the discharge power and the charge power of each load are reasonably distributed based on the running condition of the whole vehicle and the charge/discharge power limit of the whole vehicle, so that the operation requirement of the whole vehicle is met, the occurrence of the fault condition of the battery due to overcharge or overdischarge of the battery is avoided, the engine can always work at the highest efficiency point, and the effects of saving energy and reducing emission can be achieved.
Fig. 3 is a schematic flow chart of the energy management method under the working charging condition provided by the present invention, and as shown in fig. 3, the adjusting of the output power of at least one of the vehicle-mounted charger and the generator to make the discharge power requirement of the entire vehicle less than the discharge power limit of the entire vehicle may include, but is not limited to, the following steps:
comparing the discharge power requirement of the whole vehicle with the discharge power limit of the whole vehicle; under the condition that the discharge power requirement of the whole vehicle is determined to be larger than or equal to the discharge power limit of the whole vehicle, the output power of the vehicle-mounted charger is gradually increased so as to gradually increase the discharge power limit of the whole vehicle until the discharge power requirement of the whole vehicle is smaller than the discharge power limit of the whole vehicle or the output power of the vehicle-mounted charger is increased to the maximum output power.
Specifically, when it is determined that the crane is in the operation discharging working condition, in order to avoid the over-discharge phenomenon of the battery, the discharging power requirement of the whole vehicle and the discharging power limitation of the whole vehicle need to be compared, that is, whether the discharging power limitation of the whole vehicle meets the discharging power requirement of the whole vehicle is judged.
When the discharge power limit of the whole vehicle is determined not to meet the discharge power requirement of the whole vehicle (namely the discharge power requirement of the whole vehicle is larger than or equal to the discharge power limit of the whole vehicle), if the vehicle-mounted charger is not connected with the charging pile, the connection between the vehicle-mounted charger and the charging pile is established, the output power of the vehicle-mounted charger is adjusted, the maximum discharge power which can be provided by the whole vehicle is correspondingly improved due to the increase of the output power of the vehicle-mounted charger, and therefore the discharge power limit of the whole vehicle is correspondingly increased.
Optionally, after the limitation of the discharge power of the entire vehicle is gradually increased due to the gradual increase of the output power of the vehicle-mounted charger, when the requirement of the discharge power of the entire vehicle is smaller than the increased limitation of the discharge power of the entire vehicle, the output power adjustment of the vehicle-mounted charger may be stopped, and at this time, the battery is in a normal discharge state, and an over-discharge phenomenon does not occur.
However, since the output power of the vehicle-mounted charger is limited by the maximum output power, the output power of the vehicle-mounted charger is generally less than 20KW, taking a crane as an example. If the increased vehicle discharge power limit (hereinafter referred to as the current vehicle discharge power limit) is still smaller than the vehicle discharge power requirement after the output power of the vehicle-mounted charger is adjusted to the maximum output power, it indicates that the vehicle-mounted charger cannot completely share the power pressure that the battery can bear.
Referring to fig. 3, as an alternative embodiment, the energy management method of a power system provided by the present invention further includes, when the output power of the vehicle-mounted charger is increased to the maximum output power, that:
determining the current finished automobile discharge power limit;
if the finished automobile discharge power requirement is greater than or equal to the current finished automobile discharge power limit, the maximum output power output by the vehicle-mounted charger is kept;
and starting the generator, and gradually increasing the output power of the generator to further increase the discharge power limit of the whole vehicle until the discharge power requirement of the whole vehicle is less than the discharge power limit of the whole vehicle.
That is, when the vehicle-mounted charger cannot fully share the power pressure that the battery can bear, the vehicle-mounted charger preferentially outputs the maximum output power to share the power pressure that the battery can bear, and the excess power is provided by the generator.
The engine can be started, the output power provided by the engine can be adjusted in real time, and the maximum discharge power provided by the whole vehicle is correspondingly improved due to the increase of the output power of the generator, so that the discharge power limit of the whole vehicle is correspondingly increased. The output power of the engine is gradually increased, the discharge power limit of the whole vehicle is further gradually increased until the increased discharge power limit of the whole vehicle is larger than or equal to the discharge power requirement of the whole vehicle, and at the moment, the battery is adjusted to be in a normal working state, so that the over-discharge phenomenon cannot occur.
The energy management method of the power system provided by the invention is based on the running condition of the whole vehicle and the discharge power requirement of the whole vehicle, ensures that the battery does not generate an over-discharge phenomenon by measuring the magnitude between the discharge power requirement of the whole vehicle and the discharge power limitation of the whole vehicle and adjusting the output power of at least one of a vehicle-mounted charger and a generator, and avoids the occurrence of a fault reporting condition caused by over-discharge of the battery.
In addition, when the output power of at least one of the vehicle-mounted charger and the generator is adjusted, the output power of the vehicle-mounted charger is preferentially adjusted to preferentially use electric energy, so that the environment is protected, the engine can always work at the highest efficiency point, and the effects of saving energy and reducing emission can be achieved.
Fig. 4 is a schematic flow chart of the energy management method under the operation discharge condition provided by the present invention, and as shown in fig. 4, the adjusting of the output power of at least one of the generator and the vehicle-mounted charger makes the entire vehicle feedback power demand smaller than the entire vehicle charging power limit may include, but is not limited to, the following steps:
determining feedback charging power limit according to the finished automobile charging power limit and the load charging power limit; comparing the feedback power requirement of the whole vehicle with the feedback charging power limit; judging the running state of the generator under the condition that the feedback power requirement of the whole vehicle is determined to be greater than or equal to the feedback charging power limit; and gradually reducing the output power of the vehicle-mounted charger to gradually increase the feedback charging power limit until the feedback power requirement of the whole vehicle is smaller than the feedback charging power limit when the generator is determined to be in a non-power generation state.
The whole vehicle charging power limit mainly comprises a load charging power limit and a feedback charging power limit. Wherein the load charging power limit is the charging power that can be absorbed by the peripheral load; the feedback charging power limit refers to the charging power which can be born and is converted and fed back by gravitational potential energy, kinetic energy and the like; the whole vehicle feedback power demand refers to the power which needs to be received by the battery and is converted and fed back by the gravitational potential energy, the kinetic energy and the like.
Specifically, when the crane is determined to be in the operation charging working condition, in order to avoid the overcharge phenomenon of the battery, the magnitude of the feedback power requirement of the whole vehicle and the magnitude of the feedback charging power limitation need to be compared, and whether the feedback charging power limitation meets the feedback power requirement of the whole vehicle or not is judged.
When the feedback charging power limit is determined not to meet the feedback power requirement of the whole vehicle (namely, the feedback power requirement of the whole vehicle is greater than or equal to the feedback charging power limit), whether the generator is in a power generation state is judged firstly.
If the generator is in a non-power-generating state, that is, the output power of the generator is the minimum output power, it is necessary to further determine whether the vehicle-mounted charger is connected to the charging pile, and provide the output power.
Under the condition that the vehicle-mounted charger provides the output power, the load charging power limit can be reduced by reducing the output power of the vehicle-mounted charger, and the feedback charging power limit is increased under the condition that the charging power limit of the whole vehicle is not changed.
Optionally, after the feedback charging power limit is gradually increased due to the gradual decrease of the output power of the vehicle-mounted charger, when the feedback power demand of the whole vehicle is smaller than the increased feedback charging power limit, the output power adjustment of the vehicle-mounted charger may be stopped, and at this time, the battery is in a normal charging state, and the overcharge phenomenon does not occur.
As an alternative embodiment, as shown in fig. 4, when it is determined that the generator is in the power generation state, the output power of the generator is gradually decreased to gradually increase the feedback charging power limit until the vehicle feedback power requirement is smaller than the feedback charging power limit or the output power of the generator is decreased to the minimum output power (the minimum output power may be 0).
Further, if the engine is in the running state, the output power of the generator is preferentially adjusted, and after the output power of the generator is reduced, if the feedback power requirement of the whole vehicle is smaller than the feedback charging power limit, the adjustment result leads the battery to be in the normal charging state.
Based on the content of the above embodiment, in the case that the output power of the generator is reduced to the minimum output power, the method further includes:
re-determining the current feedback charging power limit; if the feedback power requirement of the whole vehicle is greater than or equal to the current feedback charging power limit, keeping the output power of the generator to be the minimum output power; and reducing the output power of the vehicle-mounted charger to further increase the feedback charging power limit until the feedback power requirement of the whole vehicle is less than the feedback charging power limit or the output power of the vehicle-mounted charger is reduced to 0.
Specifically, if the feedback power requirement of the whole vehicle is still greater than or equal to the feedback charging power limit after the output power of the generator is adjusted to 0, the output power of the vehicle-mounted charger is further adjusted to further increase the feedback charging power limit by reducing the output power of the vehicle-mounted charger until the feedback power requirement of the whole vehicle is less than the feedback charging power limit.
Optionally, when the output power of the vehicle-mounted charger is reduced to 0, the method further includes: re-determining the current feedback charging power limit; if the feedback power requirement of the whole vehicle is greater than or equal to the current feedback charging power limit, keeping the output power of the vehicle-mounted charger to be 0; and adjusting the rotating speed of an oil pump motor and the opening of the energy discharging hydraulic valve body to increase the charging power limit of the whole vehicle, and further increase the feedback charging power limit, so that the feedback power requirement of the whole vehicle is smaller than the adjusted feedback charging power limit.
Specifically, after the output power of the vehicle-mounted charger and the output power of the engine are both reduced to 0, if the feedback power requirement of the whole vehicle is still larger than or equal to the regulated feedback charging power limit, in order to avoid overcharging the battery, the invention increases the rotating speed of the oil pump motor and increases the opening of the energy discharging hydraulic valve body, so that the recovered power part is decompressed through the increase of the rotating speed of the oil pump motor and the energy discharging hydraulic valve body, and the aim of consuming redundant power is fulfilled.
The adjustment of the rotating speed of the oil pump motor and the energy discharging hydraulic valve body needs to integrate the working requirement and the safety requirement of the crane and is kept until the feedback power requirement of the whole crane is smaller than the adjusted feedback charging power limit.
The energy management method of the power system provided by the invention is based on the running condition of the whole vehicle and the charging power requirement of the whole vehicle, ensures that the battery cannot generate overcharge phenomenon by measuring the magnitude between the feedback power requirement of the whole vehicle and the feedback charging power limit and adjusting the output power of at least one of the vehicle-mounted charger and the generator, and avoids the occurrence of fault reporting caused by overcharge of the battery.
In addition, when the output power of at least one of the vehicle-mounted charger and the generator is adjusted, the output power of the engine is preferentially adjusted so as to preferentially stop the operation of the engine, and the effects of protecting the environment, saving energy and reducing emission are achieved.
Based on the content of the foregoing embodiment, as an optional embodiment, after determining that the entire vehicle operation condition is under the operation discharge condition and obtaining the entire vehicle discharge power demand, the method further includes: distributing discharge power for each high-voltage load part according to a preset discharge power distribution priority list, and adjusting the discharge power limit of the whole vehicle according to a distribution result;
after the whole vehicle feedback power requirement is acquired under the condition that the whole vehicle running condition is determined to be in the operation charging condition, the method further comprises the following steps: and distributing charging power for each high-voltage load according to a preset charging power distribution priority list, and adjusting load charging power limit according to a distribution result so as to adjust feedback charging power limit by combining the charging power limit of the whole vehicle.
Optionally, taking a crane as an example, the preset discharging power distribution priority list of the high-voltage loads is, in order from top to bottom: a DC-DC controller, a boarding compressor controller, a boarding heater (PTC) controller, a hoisting motor controller, an oil pump motor controller, a rotary motor controller and a P2 motor controller.
Optionally, taking the crane as an example, the preset charging power distribution priority list of the high-voltage loads is, in order from top to bottom: the device comprises a winding motor controller, an oil pump motor controller, a winding motor controller, a vehicle-mounted charger and a P2 motor controller.
Fig. 5 is a schematic structural diagram of an energy management device of a power system provided by the present invention, as shown in fig. 5, mainly including but not limited to: information acquisition unit 51, discharge management unit 52 and charge management unit 53, wherein:
the information acquisition unit 51 is mainly used for acquiring the finished automobile discharging power limit and the finished automobile charging power limit and determining the finished automobile running condition;
the discharge management unit 52 is mainly used for acquiring the discharge power requirement of the whole vehicle when the operation condition of the whole vehicle is determined to be in the operation discharge condition; adjusting the output power of at least one of a vehicle-mounted charger and a generator to ensure that the discharge power requirement of the whole vehicle is smaller than the discharge power limit of the whole vehicle;
the charging management unit 53 is mainly used for acquiring the feedback power requirement of the whole vehicle when the running working condition of the whole vehicle is determined to be in the working charging working condition; and adjusting the output power of at least one of the generator and the vehicle-mounted charger, so that the feedback power requirement of the whole vehicle is smaller than the charging power limit of the whole vehicle.
It should be noted that, when the energy management device of the power system provided in the embodiment of the present invention is specifically operated, the energy management method of the power system described in any of the above embodiments may be executed, and details of this embodiment are not described herein.
The energy management device of the power system provided by the invention reasonably distributes the discharge power and the charge power of each load based on the running condition of the whole vehicle and the limitation of the charge/discharge power of the whole vehicle so as to meet the operation requirement of the whole vehicle, avoid the occurrence of the fault condition of the battery due to overcharge or overdischarge of the battery, ensure that the engine can always work at the highest efficiency point, and play the roles of saving energy and reducing emission.
Based on the content of the foregoing embodiments, the present invention further provides a construction machine, where the construction machine at least includes the energy management device of the power system, so as to execute the energy management method of the power system provided in any of the foregoing embodiments.
The engineering machine provided by the invention can be one of an excavating machine, a soil shoveling and transporting machine, an engineering hoisting machine and an industrial vehicle which adopt oil-electricity hybrid operation, reasonably distributes the discharge power and the charge power of each load based on the operation condition of the whole vehicle and the charge/discharge power limit of the whole vehicle so as to meet the operation requirement of the whole vehicle, avoid the occurrence of the fault reporting condition of the battery caused by over-charge or over-discharge of the battery, and the engine can always work at the highest efficiency point, thereby playing the roles of saving energy and reducing emission.
Fig. 6 is a schematic structural diagram of an electronic device provided in the present invention, and as shown in fig. 6, the electronic device may include: a processor (processor)610, a communication Interface (Communications Interface)620, a memory (memory)630 and a communication bus 640, wherein the processor 610, the communication Interface 620 and the memory 630 communicate with each other via the communication bus 640. The processor 610 may invoke logic instructions in the memory 630 to perform a method of power system energy management, the method comprising: acquiring finished automobile discharge power limit and finished automobile charging power limit, and determining finished automobile running conditions; acquiring the discharge power requirement of the whole vehicle when the operation condition of the whole vehicle is determined to be in the operation discharge condition; adjusting the output power of at least one of a vehicle-mounted charger and a generator to ensure that the discharge power requirement of the whole vehicle is smaller than the discharge power limit of the whole vehicle; acquiring the feedback power requirement of the whole vehicle when the operation working condition of the whole vehicle is determined to be in the operation charging working condition; and adjusting the output power of at least one of the generator and the vehicle-mounted charger, so that the feedback power requirement of the whole vehicle is smaller than the charging power limit of the whole vehicle.
In addition, the logic instructions in the memory 630 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform a method of energy management for a power system provided by the above methods, the method comprising: acquiring finished automobile discharge power limit and finished automobile charging power limit, and determining finished automobile running conditions; acquiring the discharge power requirement of the whole vehicle when the operation condition of the whole vehicle is determined to be in the operation discharge condition; adjusting the output power of at least one of a vehicle-mounted charger and a generator to ensure that the discharge power requirement of the whole vehicle is smaller than the discharge power limit of the whole vehicle; acquiring the feedback power requirement of the whole vehicle when the operation working condition of the whole vehicle is determined to be in the operation charging working condition; and adjusting the output power of at least one of the generator and the vehicle-mounted charger, so that the feedback power requirement of the whole vehicle is smaller than the charging power limit of the whole vehicle.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor is implemented to perform the method for energy management of a power system provided in the above embodiments, the method comprising: acquiring finished automobile discharge power limit and finished automobile charging power limit, and determining finished automobile running conditions; acquiring the discharge power requirement of the whole vehicle when the operation condition of the whole vehicle is determined to be in the operation discharge condition; adjusting the output power of at least one of a vehicle-mounted charger and a generator to ensure that the discharge power requirement of the whole vehicle is smaller than the discharge power limit of the whole vehicle; acquiring the feedback power requirement of the whole vehicle when the operation working condition of the whole vehicle is determined to be in the operation charging working condition; and adjusting the output power of at least one of the generator and the vehicle-mounted charger, so that the feedback power requirement of the whole vehicle is smaller than the charging power limit of the whole vehicle.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method of energy management of a power system, comprising:
acquiring finished automobile discharge power limit and finished automobile charging power limit, and determining finished automobile running conditions;
acquiring the discharge power requirement of the whole vehicle when the operation condition of the whole vehicle is determined to be in the operation discharge condition; adjusting the output power of at least one of a vehicle-mounted charger and a generator to ensure that the discharge power requirement of the whole vehicle is smaller than the discharge power limit of the whole vehicle;
acquiring the feedback power requirement of the whole vehicle when the operation working condition of the whole vehicle is determined to be in the operation charging working condition; and adjusting the output power of at least one of the generator and the vehicle-mounted charger, so that the feedback power requirement of the whole vehicle is smaller than the charging power limit of the whole vehicle.
2. The energy management method of the power system according to claim 1, wherein the adjusting of the output power of at least one of a vehicle-mounted charger and a generator to make the vehicle discharge power demand less than the vehicle discharge power limit comprises:
comparing the discharge power requirement of the whole vehicle with the discharge power limit of the whole vehicle;
under the condition that the discharge power requirement of the whole vehicle is determined to be larger than or equal to the discharge power limit of the whole vehicle, the output power of the vehicle-mounted charger is gradually increased so as to gradually increase the discharge power limit of the whole vehicle until the discharge power requirement of the whole vehicle is smaller than the discharge power limit of the whole vehicle or the output power of the vehicle-mounted charger is increased to the maximum output power.
3. The energy management method of the power system according to claim 2, wherein after the output power of the vehicle-mounted charger is increased to the maximum output power, the method further comprises:
keeping the vehicle-mounted charger outputting the maximum output power;
and gradually increasing the output power of the generator to further increase the finished automobile discharge power limit until the finished automobile discharge power requirement is smaller than the finished automobile discharge power limit.
4. The method of claim 1, wherein the adjusting the output power of at least one of the generator and the vehicle charger such that the vehicle feedback power requirement is less than the vehicle charging power limit comprises:
determining feedback charging power limit according to the finished automobile charging power limit and the load charging power limit;
comparing the feedback power requirement of the whole vehicle with the feedback charging power limit;
and gradually reducing the output power of the vehicle-mounted charger under the condition that the feedback power demand of the whole vehicle is determined to be greater than or equal to the feedback charging power limit and the generator is in a non-power generation state so as to gradually increase the feedback charging power limit until the feedback power demand of the whole vehicle is smaller than the feedback charging power limit.
5. The method for energy management of a powertrain of claim 4, further comprising:
and under the condition that the feedback power demand of the whole vehicle is determined to be greater than or equal to the feedback charging power limit and the generator is in a power generation state, gradually reducing the output power of the generator to gradually increase the feedback charging power limit until the feedback power demand of the whole vehicle is smaller than the feedback charging power limit or the output power of the generator is reduced to the minimum output power.
6. The method of energy management of a powertrain of claim 5, further comprising, in the event the output power of the generator is reduced to a minimum output power:
maintaining the output power of the generator at a minimum output power;
and reducing the output power of the vehicle-mounted charger to further increase the feedback charging power limit until the feedback power requirement of the whole vehicle is less than the feedback charging power limit or the output power of the vehicle-mounted charger is reduced to 0.
7. The energy management method of the power system according to claim 6, wherein when the output power of the vehicle-mounted charger is reduced to 0, the method further comprises:
re-determining the current feedback charging power limit;
if the feedback power requirement of the whole vehicle is greater than or equal to the current feedback charging power limit, keeping the output power of the vehicle-mounted charger to be 0;
and adjusting the rotating speed of an oil pump motor and the opening of the energy discharging hydraulic valve body to increase the charging power limit of the whole vehicle, and further increase the feedback charging power limit until the feedback power requirement of the whole vehicle is smaller than the adjusted feedback charging power limit.
8. The energy management method of the power system according to any one of claims 1 to 7, wherein after determining that the running condition of the whole vehicle is in the working discharging condition and acquiring the discharging power requirement of the whole vehicle, the method further comprises the following steps: distributing discharge power for each high-voltage load part according to a preset discharge power distribution priority list, and adjusting the discharge power limit of the whole vehicle according to a distribution result;
after the whole vehicle feedback power requirement is acquired under the condition that the whole vehicle running condition is determined to be in the operation charging condition, the method further comprises the following steps: and distributing charging power for each high-voltage load according to a preset charging power distribution priority list, and adjusting load charging power limit according to a distribution result so as to adjust feedback charging power limit by combining the charging power limit of the whole vehicle.
9. An energy management device for a powertrain system, comprising: the system comprises an information acquisition unit, a discharge management unit and a charge management unit;
the information acquisition unit is used for acquiring the finished automobile discharging power limit and the finished automobile charging power limit and determining the finished automobile running condition;
the discharge management unit is used for acquiring the discharge power requirement of the whole vehicle when the running working condition of the whole vehicle is determined to be in the operation discharge working condition; adjusting the output power of at least one of a vehicle-mounted charger and a generator to ensure that the discharge power requirement of the whole vehicle is smaller than the discharge power limit of the whole vehicle;
the charging management unit is used for acquiring the feedback power requirement of the whole vehicle when the running working condition of the whole vehicle is determined to be in the working charging working condition; and adjusting the output power of at least one of the generator and the vehicle-mounted charger, so that the feedback power requirement of the whole vehicle is smaller than the charging power limit of the whole vehicle.
10. A work machine comprising the power system energy management device of claim 9.
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