CN113183831B - Energy management method of three-energy new energy automobile and electronic equipment - Google Patents
Energy management method of three-energy new energy automobile and electronic equipment Download PDFInfo
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- CN113183831B CN113183831B CN202110456787.2A CN202110456787A CN113183831B CN 113183831 B CN113183831 B CN 113183831B CN 202110456787 A CN202110456787 A CN 202110456787A CN 113183831 B CN113183831 B CN 113183831B
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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
- B60L58/40—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for controlling a combination of batteries and fuel cells
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/40—Electric propulsion with power supplied within the vehicle using propulsion power supplied by 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
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Sustainable Energy (AREA)
- Fuel Cell (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention provides an energy management method and electronic equipment of a three-energy new energy automobile, which are used for acquiring feedback power and motor power of the whole automobile, controlling output power of a fuel cell, and outputting idle power by the fuel cell when the feedback power of the whole automobile reaches a certain value; when the feedback power of the whole vehicle is lower than a certain value, acquiring a power battery SOC value, determining a first fuel battery power corresponding to the power battery SOC value according to the power battery SOC value, outputting a second fuel battery power corresponding to the accelerator pedal opening when the accelerator pedal opening is between a threshold range, and determining the maximum value between the first fuel battery power and the second fuel battery power as the fuel battery output power; and controlling the output power of the super capacitor, wherein the difference value between the motor power and the output power of the fuel cell and the output power of the super capacitor is the power of the power cell. By reasonably adjusting the energy flow and the power between the three energy sources, the output power smoothness of the hydrogen fuel cell is improved, and the service life of the hydrogen fuel cell is effectively prolonged.
Description
Technical Field
The invention belongs to the technical field of battery energy control of new energy automobiles, and particularly relates to an energy management method and electronic equipment of a three-energy new energy automobile.
Background
With the formulation of the national 'carbon reaching peak, carbon neutralization' targets, the application research of new energy sources in various industries is more and more extensive and deep, and automobiles are no exception naturally as important energy consumption carriers. The new energy sources applied to the automobiles at present mainly comprise power batteries, hydrogen fuel cells, super capacitors and the like, and all the new energy sources have obvious defects, such as the power batteries are greatly influenced by temperature, the charge and discharge multiplying power is not high, the dynamic response of the hydrogen fuel cells is slow, the energy cannot be recovered, the super capacitors are low in energy density and the like, and the requirements of the automobiles on the dynamic property and the economy are hardly met by a certain single energy source, so that the combined use of the new energy sources becomes a necessary choice. How to fully exert the advantages of each energy source, avoid the disadvantages and make a set of proper three-energy management system become particularly critical.
Disclosure of Invention
The invention solves the main problem of reasonably controlling the power of the energy sources in the new energy automobile powered by the three energy sources in real time, so that the driving range of the whole automobile is effectively ensured, and the dynamic performance of the whole automobile is effectively ensured.
According to one aspect of the invention, the invention discloses an energy management method of a three-energy new energy automobile, comprising the following steps:
acquiring feedback power and motor power of the whole vehicle;
when the feedback power of the whole vehicle reaches a first threshold value, the fuel cell outputs idle power;
when the feedback power of the whole vehicle is lower than a first threshold value, acquiring a power battery SOC value, and outputting a first fuel battery power corresponding to the power battery SOC value by a fuel battery;
outputting a second fuel cell power corresponding to the accelerator pedal opening when the accelerator pedal opening is between the threshold ranges;
determining a maximum value between the first fuel cell power and the second fuel cell power as a fuel cell output power;
further, the output power of the super capacitor is controlled and controlled simultaneously: acquiring the output power of the super capacitor when the super capacitor works in the first power charge-discharge mode, or acquiring the output power of the super capacitor as a preset value when the super capacitor works in the second power charge-discharge mode;
and the difference value between the motor power and the output power of the fuel cell and the output power of the super capacitor is the power of the power battery.
Further, the first threshold is 60kw.
Further, the determining the first fuel cell power corresponding to the power cell SOC value according to the power cell SOC value includes:
determining a power segmentation point of the power of the first fuel cell by adopting a segmentation power point mode through a simulation experiment or a real vehicle experiment;
and controlling the power of the first fuel cell according to the power segmentation point.
Further, the threshold range is 60% -90%.
Further, the activation condition of the first power charge-discharge mode is:
and the super capacitor SOC value is activated when the super capacitor SOC value is larger than the SOC lower limit threshold and the whole vehicle residual required power is larger than the whole vehicle driving power lower limit threshold, or activated when the super capacitor SOC value is smaller than the SOC upper limit threshold and the whole vehicle residual required power is smaller than the whole vehicle feedback power lower limit threshold.
Further, the obtaining, by the supercapacitor, the supercapacitor output power in the first power charging and discharging mode includes:
and calculating a difference value between the feedback power of the whole vehicle and the power of the fuel cell, wherein the difference value is the residual required power of the whole vehicle, and the residual required power of the whole vehicle is used as the output power of the super capacitor.
Further, stopping charging when the super capacitor SOC exceeds the SOC upper limit threshold;
and stopping discharging when the SOC of the super capacitor exceeds the SOC lower limit threshold.
Further, when the supercapacitor works in the second power charge-discharge mode, the outputting of the power of the supercapacitor to the preset value includes:
the output power of the super capacitor is preset to be 10kw, and the super capacitor is used for preventing power impact on the power battery when working in the second power charge-discharge mode.
According to another aspect of the present invention, there is also disclosed an electronic device comprising a memory and a processor and computer instructions stored on the memory and running on the processor, which when executed by the processor, perform the energy management method of a three energy source new energy vehicle as set forth in any one of the preceding claims.
Because the whole vehicle power is provided by the combination of the power battery, the hydrogen fuel cell and the super capacitor, the power of two energy sources is only required to be controlled in real time, and the power of the other energy source can automatically follow the variation. In particular, the hydrogen fuel cell has high energy density, and can effectively ensure the driving range of the whole vehicle; the super capacitor has high power density and can effectively ensure the dynamic performance of the whole vehicle, so the invention adopts a mode of actively controlling the output power of the hydrogen fuel cell and the super capacitor in real time and passively controlling the power cell to manage the energy system of the hydrogen fuel cell automobile.
The energy management method and the system for the three-energy new energy automobile control the SOC value of the super capacitor to be always kept at a high position of 70%, the whole automobile can respond to the output of the maximum power of the motor at any time, the power performance of the whole automobile is ensured, the output power smoothness of the hydrogen fuel cell is greatly improved by adjusting the energy flow and the power between the three energy sources in real time, and the service life of the hydrogen fuel cell is effectively prolonged.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic diagram of output power fluctuation of a fuel cell according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of output power fluctuation of a supercapacitor according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
The present invention will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
An embodiment one discloses an energy management method of a three-energy hydrogen energy automobile, which comprises the following steps: obtaining the feedback power P of the whole vehicle reg And motor power P mot In some embodiments P reg Set to 60kw; when the feedback power of the whole vehicle reaches 60kw, the fuel cell outputs idle power;
when the feedback power of the whole vehicle is lower than 60kw, the output power P of the fuel cell is controlled by the following method fc ：
Firstly, acquiring a power battery SOC value, and outputting fuel battery power P corresponding to the power battery SOC value by a fuel battery 1 In order to reduce the fluctuation frequency of the output power of the fuel cell, a sectional power point mode is adopted, the output power of the fuel cell is calibrated through a real vehicle experiment, and the output power of the fuel cell is divided into 9 power points [5,10,15,20,25,30,40,50,60 ] in the embodiment]。
When the opening of the accelerator pedal is larger, the output power of the fuel cell is required to be larger power P 2 In order to ensure that the fuel cell can quickly respond when the high power of the whole vehicle is required, in the embodiment of the invention, the request is started when the opening of the accelerator pedal is 60 percent, the corresponding maximum power output by the fuel cell is 45KW, and when the opening of the accelerator pedal is 90 percent or more, the maximum power of the output power of the fuel cell is 60KW, namely the output power of the fuel cell increases linearly between 60 percent and 90 percent of the opening of the accelerator pedal.
Determining fuel cell power P 1 And fuel cell power P 2 The maximum value between them is used as the output power of the fuel cell.
Super capacitor output power P sc The control method of (2) is as follows:
setting the working mode of the super capacitor to be a high-power charge-discharge mode and a low-power charge-discharge mode;
when the super capacitor works in a high-power charge-discharge mode, the output power of the super capacitor is obtained, or when the super capacitor works in a low-power charge-discharge mode, the output power of the super capacitor is a preset value;
the difference between the power of the motor and the output power of the fuel cell and the output power of the super capacitor is the output power of the power cell.
In some embodiments, the activation conditions of the two charge-discharge operation modes (high-power charge-discharge mode and low-power charge-discharge mode) of the super capacitor are:
the activation conditions of the high-power charge-discharge mode are as follows:
(1) The SOC value of the super capacitor is larger than the control lower limit value SOC low And the residual required power P of the whole vehicle 3 Greater than the lower limit value P of the driving power dlow Time activated, SOC in this embodiment low Set to 30%, P dlow Setting 40KW;
(2) The SOC of the super capacitor is smaller than the control upper limit value SOC high And the residual required power P of the whole vehicle 3 Less than the feedback power lower limit value P rlow The SOC of the invention high Set to 85%, P rlow Setting to-40 KW;
the two conditions can be activated only by meeting any one of the conditions, and the high-power charge and discharge working mode can be activated, otherwise, the super capacitor works in the low-power charge and discharge mode.
The super capacitor can charge and discharge peak power when working in a high-power charge and discharge mode, and the actual charge and discharge power follows the residual required power P of the whole vehicle 3 In this embodiment, the peak charge and discharge power of the supercapacitor is 120KW.
In this embodiment, the charging power of the super capacitor is limited to Pcharge and the discharging power is limited to pdicharge in the low-power charging and discharging mode, in this embodiment of the present invention, pcharge is set to 10KW and pdicharge is set to 20KW.
In this embodiment, the SOC value of the super capacitor exceeds the upper limit value SOC high When not allowing charging, which exceeds the lower limit valueSOC low No discharge is allowed.
In determining the fuel cell power P fc And super capacitor power P sc After that, power battery power P bat It is also indirectly known that:
P bat ＝P mot -P fc -P sc ，
through verification, the output power smoothness of the fuel cell and the working mechanism of the super capacitor are all in line with expectations, and the energy management system of three energy sources can work normally and stably:
as shown in fig. 1, the fuel cell power is operated at a set power point, the load variation amplitude is very small, and the fluctuation amplitude of the fuel cell output power is measured by using the smoothness S, wherein the calculation formula of the smoothness is as follows:
wherein P is 0 For the maximum output net power of the fuel cell, S is smoothness, t is time, and as can be seen from fig. 1, after a complete WTVC condition, the fuel cell smoothness S is only 1.17.
As shown in FIG. 2, the super capacitor SOC is always kept at a high level, and high-power charge and discharge are performed only when the power required by the whole vehicle is high, so that the strategy target of the energy system management of the three-energy automobile is met.
In some embodiments, an electronic device is also disclosed, including a memory and a processor, and computer instructions stored on the memory and running on the processor, which when executed by the processor, perform an energy management method for a three energy source new energy vehicle according to any of the foregoing embodiments.
The control method of the invention adopts a mode of actively controlling the fuel cell and the super capacitor in real time and passively controlling the power cell, thereby ensuring the power performance of the whole vehicle, greatly improving the output power smoothness of the hydrogen fuel cell and effectively prolonging the service life of the hydrogen fuel cell.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the invention, but any modifications, equivalents, and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
It should also be noted that 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 one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
Claims (6)
1. An energy management method of a three-energy new energy automobile is characterized by comprising the following steps:
acquiring feedback power and motor power of the whole vehicle;
controlling the output power of the fuel cell:
when the feedback power of the whole vehicle reaches a first threshold value, the fuel cell outputs idle power;
when the feedback power of the whole vehicle is lower than a first threshold value, acquiring a power battery SOC value, and determining a first fuel battery power corresponding to the power battery SOC value according to the power battery SOC value;
outputting a second fuel cell power corresponding to the accelerator pedal opening when the accelerator pedal opening is between the threshold ranges;
determining a maximum value between the first fuel cell power and the second fuel cell power as a fuel cell output power;
further comprises:
meanwhile, the output power of the super capacitor is controlled: obtaining the output power of the super capacitor when the super capacitor works in a first power charge-discharge mode, or obtaining the output power of the super capacitor as a preset value when the super capacitor works in a second power charge-discharge mode;
the activation condition of the first power charge-discharge mode is as follows:
the super capacitor SOC value is activated when the super capacitor SOC value is larger than the SOC lower limit threshold and the whole vehicle residual required power is larger than the whole vehicle driving power lower limit threshold, or activated when the super capacitor SOC value is smaller than the SOC upper limit threshold and the whole vehicle residual required power is smaller than the whole vehicle feedback power lower limit threshold;
the super capacitor obtaining the output power of the super capacitor in the first power charging and discharging mode comprises the following steps:
calculating a difference value between the feedback power of the whole vehicle and the power of the fuel cell, wherein the difference value is the residual required power of the whole vehicle, and the residual required power of the whole vehicle is used as the output power of the super capacitor;
when the super capacitor works in the second power charge-discharge mode, the output power of the super capacitor is a preset value, which comprises:
the output power of the super capacitor is 10kw, and the super capacitor is used for preventing the power battery from being impacted when the super capacitor works in the second power charge-discharge mode.
2. The method for energy management of a three energy source new energy vehicle of claim 1, wherein said first threshold is 60kw.
3. The method for energy management of a three energy source new energy vehicle according to claim 1, wherein said determining a first fuel cell power corresponding to said power cell SOC value from said power cell SOC value comprises:
determining a power segmentation point of the power of the first fuel cell by adopting a segmentation power point mode through a simulation experiment or a real vehicle experiment;
and controlling the power of the first fuel cell according to the power segmentation point.
4. The method for energy management of a three energy source new energy vehicle of claim 1, wherein the threshold range is 60% to 90%.
5. The method for energy management of a three-energy new energy automobile according to claim 1, wherein,
stopping charging when the SOC of the super capacitor exceeds the SOC upper limit threshold;
and stopping discharging when the SOC of the super capacitor exceeds the SOC lower limit threshold.
6. An electronic device comprising a memory and a processor and computer instructions stored on the memory and running on the processor, which when executed by the processor, perform a method of energy management of a three energy source new energy vehicle according to any one of claims 1-5.
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