CN112550086B - Vehicle energy management method and device, vehicle and storage medium - Google Patents
Vehicle energy management method and device, vehicle and storage medium Download PDFInfo
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- CN112550086B CN112550086B CN202011532573.0A CN202011532573A CN112550086B CN 112550086 B CN112550086 B CN 112550086B CN 202011532573 A CN202011532573 A CN 202011532573A CN 112550086 B CN112550086 B CN 112550086B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention discloses a vehicle energy management method, a device, a vehicle and a storage medium, wherein the vehicle energy management method comprises the following steps: determining preset output power and a first correction parameter of the fuel cell according to the state of charge and the current temperature of the power cell; if the preset output power is larger than the first correction parameter, correcting the output power of the fuel cell based on the first correction parameter to obtain corrected output power; and controlling the vehicle to operate based on the corrected output power and the state of charge to realize energy management of the vehicle. According to the technical scheme, the output power of the fuel cell is corrected under the charge state and the current temperature of the power cell, so that the vehicle is controlled to operate, the energy management of the vehicle is realized, the fuel cell is operated under the required output characteristic on the premise of meeting the power requirement of the whole vehicle, the power cell cannot be overcharged, the service life of the fuel cell is prolonged, and the safety of a vehicle power supply network is improved.
Description
Technical Field
The embodiment of the invention relates to the technology of fuel cell vehicles, in particular to a vehicle energy management method, a device, a vehicle and a storage medium.
Background
Fuel cell vehicles may be equipped with two energy sources, one being a fuel cell and the other being a power cell. The fuel cell has the following operation characteristics: the response is slow, and the load change operation is not easy to frequently occur. But the power consumption of the whole vehicle has the characteristics of large amplitude and quick change. Therefore, a power battery needs to be matched to relieve the contradiction between the power demand of the whole vehicle and the fuel battery. The purpose of vehicle energy management is to manage the output state of the fuel cell and the state of charge of the power cell, and to operate the fuel cell and the power cell in reasonable working states based on their operating characteristics, so as to efficiently and safely provide electric energy to the vehicle.
In the prior art, the output of the fuel cell is controlled according to the power requirement of the whole vehicle and the state of charge of the power cell, so that the fuel cell and the power cell can work in an optimal interval, and the output power of the fuel cell is limited.
However, the operating point of the fuel cell is still in continuous adjustment and change along with the change of the electric power demand of the vehicle and the influence factors such as the allowable charging power of the power battery, and although the frequent fluctuation of the output power of the fuel cell is reduced to a certain extent, the operating characteristic of the fuel cell is not completely fitted, and the service life of the fuel cell is influenced. Therefore, a vehicle energy management method is needed to operate the fuel cell under the required output characteristics without overcharging the power battery on the premise of meeting the power requirement of the entire vehicle, so as to improve the service life of the fuel cell and the safety of the vehicle power network.
Disclosure of Invention
The invention provides a vehicle energy management method, a vehicle energy management device, a vehicle and a storage medium, which are used for enabling a fuel cell to operate under the required output characteristic on the premise of meeting the power requirement of the whole vehicle, preventing a power battery from being overcharged, and prolonging the service life of the fuel cell and improving the safety of a vehicle power supply network.
In a first aspect, an embodiment of the present invention provides a vehicle energy management method, including:
determining preset output power and a first correction parameter of the fuel cell according to the state of charge and the current temperature of the power cell;
if the preset output power is larger than the first correction parameter, correcting the output power of the fuel cell based on the first correction parameter to obtain corrected output power;
and controlling the vehicle to run based on the corrected output power and the state of charge to realize energy management of the vehicle.
Further, according to the state of charge and the current temperature of the power battery, determining a first correction parameter of the fuel battery, which comprises the following steps:
determining a correction coefficient of the allowable charging power of the power battery according to the minimum load change interval of the fuel battery, the total energy of the power battery and the allowable power change rate of the power battery under the state of charge and the current temperature;
and determining the product of the correction coefficient of the allowable charging power of the power battery and the allowable charging power of the power battery as the first correction parameter.
Further, according to the total energy of the power battery, determining a first threshold value, a second threshold value and a third threshold value of the state of charge of the power battery,
correspondingly, the preset output power of the fuel cell is determined according to the state of charge and the current temperature of the power cell, and the method comprises the following steps:
if the state of charge of the power battery is smaller than or equal to the first threshold, determining that the preset output power of the fuel battery is the first output power;
if the state of charge of the power battery is larger than the first threshold and smaller than or equal to the second threshold, determining that the preset output power of the fuel battery is a second output power;
if the state of charge of the power battery is larger than the second threshold and smaller than or equal to a third threshold, determining that the preset output power of the fuel battery is a third output power;
and if the state of charge of the power battery is larger than the third threshold, determining that the preset output power of the fuel battery is fourth output power.
Further, correcting the output power of the fuel cell based on the first correction parameter to obtain a corrected output power, including:
and determining a first correction parameter as the corrected output power.
Further, the method also comprises the following steps:
and correcting the driving power of the driving motor according to a preset strategy to obtain the corrected driving power.
Further, according to a preset strategy, correcting the driving power of the driving motor to obtain a corrected driving power, including:
if the state of charge of the power battery is smaller than or equal to the first threshold, comparing the driving power with the difference value between the corrected output power and the power of other electric loads, and determining a smaller power value as a second correction parameter;
if the state of charge of the power battery is larger than the first threshold value, comparing the driving power and the sum of the corrected output power and the allowable discharge power of the power battery, and determining a smaller power value as a second correction parameter;
and correcting the driving power based on the second correction parameter to obtain the corrected driving power.
Further, the method further comprises:
and if the preset output power is less than or equal to the first correction parameter, determining the preset output power as the output power of the fuel cell.
In a second aspect, an embodiment of the present invention further provides a vehicle energy management device, including:
the determining module is used for determining the preset output power and the first correction parameter of the fuel cell according to the charge state and the current temperature of the power cell;
the correction module is used for correcting the output power of the fuel cell based on the first correction parameter if the preset output power is larger than the first correction parameter, so as to obtain corrected output power;
and the control module is used for controlling the vehicle to run based on the corrected output power and the state of charge so as to realize energy management of the vehicle.
In a third aspect, an embodiment of the present invention further provides a vehicle, including:
one or more processors;
storage means for storing one or more programs;
the sensing device is used for acquiring the ambient temperature;
when executed by the one or more processors, cause the one or more processors to implement the vehicle energy management method of any of the first aspects.
In a fourth aspect, embodiments of the present invention also provide a storage medium containing computer-executable instructions for performing the vehicle energy management method of any one of the first aspects when executed by a computer processor.
The invention provides a vehicle energy management method, which comprises the following steps: determining preset output power and a first correction parameter of the fuel cell according to the state of charge and the current temperature of the power cell; if the preset output power is larger than the first correction parameter, correcting the output power of the fuel cell based on the first correction parameter to obtain corrected output power; and controlling the vehicle to run based on the corrected output power and the state of charge to realize energy management of the vehicle. According to the technical scheme, the output power of the fuel cell is corrected under the state of charge and the current temperature of the power cell, so that the vehicle is controlled to operate, the energy management of the vehicle is realized, the fuel cell is enabled to operate under the output characteristic required by the fuel cell on the premise of meeting the power requirement of the whole vehicle, the power cell cannot be overcharged, the service life of the fuel cell is prolonged, and the safety of a vehicle power supply network is improved.
Drawings
FIG. 1 is a block diagram of a vehicle in a vehicle energy management system provided by the present invention;
FIG. 2 is a flow chart of a method for managing vehicle energy according to an embodiment of the present invention;
FIG. 3 is a graph illustrating hysteresis regulation of the output power of the fuel cell in switching between a plurality of predetermined output powers in a vehicle energy management method according to an embodiment of the present invention;
FIG. 4 is a flowchart of a vehicle energy management method according to a second embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a calculation conversion manner of a power battery allowable charging power table, a μ value table and a correction coefficient table in a vehicle energy management method according to a second embodiment of the present invention;
fig. 6 is a structural diagram of a vehicle energy management device according to a third embodiment of the present invention;
fig. 7 is a schematic structural diagram of a vehicle according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings, not all of them.
Before discussing exemplary embodiments in greater detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently, or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like. In addition, the embodiments and features of the embodiments in the present invention may be combined with each other without conflict.
Fig. 1 is a structural diagram of a vehicle in the vehicle energy management system provided by the present invention, and as shown in fig. 1, the vehicle energy management system may be composed of a fuel cell, a power cell, a thermal management system, a vehicle controller, a driving motor, and other electric devices. Wherein the fuel cell is an energy source of the entire vehicle; the power battery may act as a buffer for the vehicle power network; the thermal management system can enable the fuel cell and the power battery to work at proper temperature, and the temperature adaptability of a vehicle power supply network is improved; the driving motor is a main energy consumption part of the vehicle and is used for driving the vehicle to run; the vehicle control unit comprehensively coordinates and controls the working states of the components so that the components can operate in a coordinated manner, the energy requirement of the vehicle is met, the operating efficiency is improved, and the service life is prolonged.
In the invention, the vehicle control unit may include a processor, a memory, an external communication interface, and the like. The Controller CAN be used for controlling a Controller Area Network (CAN) communication interface, and CAN acquire information from the CAN communication interface, such as information of torque required by a driver, the SOC of a power battery, the output power of the temperature fuel cell of the power battery and the like. The vehicle control unit CAN also send a power output command to the fuel cell and a torque control command to the driving motor from the CAN communication interface. Meanwhile, the fuel cell CAN adjust the output power of the fuel cell after receiving the command from the CAN communication interface, and the driving motor CAN receive the torque command from the CAN communication interface to adjust the torque output of the driving motor. The thermal management system can adjust the heat circulation of the driving motor and the battery system according to the command of the vehicle control unit, so that the driving motor and the battery system are stabilized in the required temperature range.
Wherein, the fuel cell operation characteristics are: the response is slow, and the frequent variable load operation is not easy. But the power consumption of the whole vehicle has the characteristics of large amplitude and quick change. Therefore, a power lithium battery needs to be matched to relieve the contradiction between the power consumption requirement of the whole vehicle and the fuel battery. According to the control requirement that the fuel cell is not suitable for frequent load change, the output electric power of the fuel cell can be switched at a plurality of fixed preset output powers according to the state of charge (SOC) of the power cell, and the fixed preset output powers can be calibrated in advance.
When the SOC of the power battery is too low, the fuel battery needs to output larger power so as to meet the requirements of vehicle running and power battery power supplement at the same time; when the SOC of the power battery is too high, the fuel battery outputs low power, so that the vehicle mainly consumes the electric quantity of the power battery, and the SOC of the power battery is reduced to the optimal working range. When the fuel cell outputs according to a certain preset output power, the allowable charging power of the power cell should be fully considered to prevent the power cell from being overcharged, and in order to ensure that the output power of the fuel cell is always smaller than the allowable charging power of the power cell in the whole minimum load variation interval, the output power of the fuel cell needs to be adjusted according to the charging characteristic of the power cell.
Example one
Fig. 2 is a flowchart of a vehicle energy management method according to an embodiment of the present invention, where the embodiment is applicable to a situation of managing a state of charge of a vehicle power battery and an output power of a fuel cell, and the method may be executed by a vehicle system, as shown in fig. 2, and specifically includes the following steps:
and step 210, determining preset output power and a first correction parameter of the fuel cell according to the state of charge and the current temperature of the power cell.
The preset output power of the fuel cell can be calibrated in advance according to the total energy and the state of charge of the power cell. For example, according to the total energy of the power battery, a first threshold value, a second threshold value and a third threshold value of the state of charge of the power battery are determined. If the state of charge of the power battery is smaller than or equal to the first threshold, determining that the preset output power of the fuel battery is the first output power; if the state of charge of the power battery is larger than the first threshold and smaller than or equal to the second threshold, determining that the preset output power of the fuel battery is a second output power; if the state of charge of the power battery is larger than the second threshold and smaller than or equal to a third threshold, determining that the preset output power of the fuel battery is a third output power; and if the state of charge of the power battery is larger than the third threshold, determining that the preset output power of the fuel battery is fourth output power.
It is appreciated that the first, second and third thresholds may be A, B and C, respectively. The first output power, the second output power, the third output power and the fourth output power may be X, respectively 1 、X 2 、X 3 And X 4 . In this embodiment, A, B and C may be 30%, 50% and 90%, respectively. X 1 、X 2 、X 3 And X 4 And may be 60KW, 40KW, 20KW and 6KW, respectively. Of course, in practical application, values of the first threshold, the second threshold, the third threshold, the first output power, the second output power, the third output power, and the fourth output power may be determined according to an actual requirement and a total energy of the power battery, and are not specifically limited herein.
In addition, the first correction parameter may also be used to correct the output power of the fuel cell, and a specific value of the first correction parameter may be determined according to the current temperature and the state of charge of the power cell.
Specifically, a correction coefficient of the allowable charging power of the power battery can be determined according to the minimum load change interval of the fuel battery, the total energy of the power battery and the allowable power change rate of the power battery under the state of charge and the current temperature; and determining the product of the correction coefficient of the allowable charging power of the power battery and the allowable charging power of the power battery as the first correction parameter.
The minimum variation interval of the fuel cell may be a minimum interval of variation in output power of the fuel cell; the total energy of the power battery is related to the brand and the service life of the power battery; the allowable power change rate of the power battery under the state of charge and the current temperature can be obtained by calculation according to a change table of the allowable charging power of the power battery along with the temperature and the SOC.
In this embodiment, the preset output power and the first correction parameter at the current state of charge and the current temperature may be determined first, and the output power of the fuel cell may be further corrected according to the preset output power and the first correction parameter, so as to manage the output power of the fuel cell of the vehicle.
Specifically, when the load of the fuel cell is changed, a first correction parameter needs to be selected according to the state of charge and the temperature state of the power cell, so that the overcharge of the power cell is avoided. When the fuel cell is subjected to load variation toward the preset output power, the preset output power is compared with the first correction parameter, and the smaller value of the preset output power and the first correction parameter can be taken as the corrected output power.
It is noted that the preset output power is determined as the corrected output power if the preset output power is smaller than the first correction parameter.
In addition, fig. 3 is a graph illustrating a hysteresis regulation curve of the output power of the fuel cell switching between a plurality of preset output powers in a vehicle energy management method according to an embodiment of the present invention, and as shown in fig. 3, when the output power of the fuel cell switches between a plurality of preset output powers, an oscillation control at a certain preset output power can be avoided by using the hysteresis method. That is, there should be a certain interval between the output power switching point of the fuel cell when the SOC of the power cell is changed in the increasing direction and the switching point when the SOC is changed in the decreasing direction.
In this embodiment, a smaller value between the preset output power and the first correction parameter may be used as the corrected output power.
And step 230, controlling the vehicle to operate based on the corrected output power and the state of charge, and realizing energy management of the vehicle.
Specifically, after the corrected output power of the fuel cell is determined, the driving motor and other electric devices of the vehicle can be powered according to the corrected output power in the state of charge of the power cell, and energy management of the vehicle is achieved.
The embodiment of the invention provides a vehicle energy management method, which comprises the following steps: determining preset output power and a first correction parameter of the fuel cell according to the state of charge and the current temperature of the power cell; if the preset output power is larger than the first correction parameter, correcting the output power of the fuel cell based on the first correction parameter to obtain corrected output power; and controlling the vehicle to run based on the corrected output power and the state of charge to realize energy management of the vehicle. According to the technical scheme, the output power of the fuel cell is corrected under the charge state and the current temperature of the power cell, so that the vehicle is controlled to operate, the energy management of the vehicle is realized, the fuel cell is operated under the required output characteristic on the premise of meeting the power requirement of the whole vehicle, the power cell cannot be overcharged, the service life of the fuel cell is prolonged, and the safety of a vehicle power supply network is improved.
Example two
Fig. 4 is a flowchart of a vehicle energy management method according to a second embodiment of the present invention, which is embodied on the basis of the second embodiment. As shown in fig. 4, in this embodiment, the method may further include:
and step 410, determining preset output power and a first correction parameter of the fuel cell according to the state of charge and the current temperature of the power cell.
In the embodiment, the preset output power of the fuel cell can be determined according to the state of charge of the power cell; the first correction parameter may be determined according to a state of charge and a current temperature of the power battery.
In one embodiment, the step of determining a first correction parameter for the fuel cell comprises:
and determining a correction coefficient of the allowable charging power of the power battery according to the minimum load change interval of the fuel battery, the total energy of the power battery and the allowable power change rate of the power battery under the state of charge and the current temperature.
Specifically, the correction coefficient may be determined according to the following formula:
λ＝W/(W+100μT)
wherein λ represents a correction coefficient; w represents the total energy of the power battery, and the unit KW & h; mu represents the allowable charging power change rate of the power battery under the current state of charge and the current temperature; t represents the minimum variable load interval of the fuel cell, and the unit is h; mu can be calculated according to a change table of the allowable charging power of the power battery along with the temperature and the SOC.
Table 1 is a power battery allowable charging power table, table 2 is a μ value table, and table 3 is a correction coefficient table.
Table 1 contains allowable charging power of the power battery at a plurality of temperatures and a plurality of states of charge, table 2 contains μ values at a plurality of temperatures and a plurality of states of charge, and table 3 contains correction coefficients at a plurality of temperatures and a plurality of states of charge.
TABLE 1
TABLE 2
TABLE 3
Fig. 5 is a schematic diagram illustrating a calculation conversion manner of the allowable charging power table, the μ value table and the correction coefficient table of the power battery in the vehicle energy management method according to the second embodiment of the present invention, as shown in fig. 5, the μ value may be calculated according to table 2, the calculation method is to subtract the power value of the next column from the power value of the previous column of each row, and then the difference and the division by 10 are filled into the table corresponding to the previous column of the row, so as to calculate the μ value corresponding to each column of the remaining rows, and obtain the μ value table.
And calculating a corresponding correction coefficient according to a formula lambda, wherein the formula lambda is W/(W +100 mu T), obtaining a correction coefficient table, and further determining the correction coefficient at any temperature and in any state of charge.
In this embodiment, the corresponding correction coefficient may be searched in the correction coefficient table according to the current temperature and the current state of charge.
And determining the product of the correction coefficient of the allowable charging power of the power battery and the allowable charging power of the power battery as the first correction parameter.
The first correction parameter may specifically be determined according to the following formula:
γ＝λ·P c
wherein γ denotes a first correction parameter, λ denotes a correction coefficient, P c And the allowable charging power of the power battery is represented.
In the present embodiment, after the first correction coefficient is determined, the output power of the fuel cell may be corrected based on the first correction coefficient, further achieving energy management of the vehicle.
In one embodiment, a first threshold value, a second threshold value, a third threshold value and a fourth threshold value of the state of charge of the power battery are determined according to the total energy of the power battery,
accordingly, the step of determining the preset output power of the fuel cell includes:
and if the state of charge of the power battery is smaller than or equal to the first threshold, determining that the preset output power of the fuel battery is the first output power. And if the state of charge of the power battery is greater than the first threshold and less than or equal to the second threshold, determining that the preset output power of the fuel battery is a second output power. And if the state of charge of the power battery is greater than the second threshold and less than or equal to a third threshold, determining that the preset output power of the fuel battery is a third output power. And if the state of charge of the power battery is larger than the fourth threshold, determining that the preset output power of the fuel battery is fourth output power.
Wherein the first threshold, the second threshold and the third threshold may be A, B and C, respectively. The first output power, the second output power, the third output power and the fourth output power may be X, respectively 1 、X 2 、X 3 And X 4 . In this embodiment, A, B and C may be 30%, 50% and 90%, respectively. X 1 、X 2 、X 3 And X 4 And may be 60KW, 40KW, 20KW and 6KW, respectively.
Correspondingly, if the SOC of the power battery is less than 30%, determining that the first output power is 60 KW; if the SOC of the power battery is more than 30% and less than 50%, determining that the second output power is 40 KW; if the SOC of the power battery is more than 50% < 90%, determining that the third output power is 20 KW; and if the SOC of the power battery is more than 90%, determining that the fourth output power is 6 KW.
It should be noted that when the power battery SOC > 90%, the vehicle may be operated without requesting power output from the fuel cell, so the fourth output power may be 0.
In this embodiment, the first threshold, the second threshold, the third threshold, the first output power, the second output power, the third output power, and the fourth output power may be determined according to the total energy of the power battery and the loss condition of the power battery, so as to determine the preset output power of the fuel cell in the current state of charge of the power battery.
And step 420, if the preset output power is larger than the first correction parameter, correcting the output power of the fuel cell based on the first correction parameter to obtain the corrected output power.
In one embodiment, modifying the output power of the fuel cell based on the first modification parameter to obtain a modified output power includes:
and determining a first correction parameter as the corrected output power.
And step 430, if the preset output power is less than or equal to the first correction parameter, determining the preset output power as the output power of the fuel cell.
In this embodiment, a smaller value of the preset output power and the first correction parameter may be used as the corrected output power.
And 440, correcting the driving power of the driving motor according to a preset strategy to obtain the corrected driving power.
In this embodiment, the output power of the fuel cell may be corrected while the driving power of the driving motor is corrected, and the power output of the driving motor is controlled according to the SOC of the power cell, the corrected output power of the fuel cell, the available discharge power of the power cell, and the driving demand.
When the SOC of the power battery is low, comparing the driving power demand with the difference value between the output power of the fuel battery and the power of other electricity loads to ensure that the power battery does not continuously release electric energy outwards, and taking the smaller power value of the driving power demand and the output power of the fuel battery as the output power of the driving motor by the vehicle controller; when the power battery is higher than the preset SOC value, the power of the driving motor is smaller than the sum of the current output power of the fuel battery and the available discharge power of the power battery.
In one embodiment, step 440 specifically includes:
and if the state of charge of the power battery is smaller than or equal to the first threshold, comparing the driving power and the difference value between the corrected output power and the power of other electric loads, and determining a smaller power value as a second correction parameter.
In particular, the drive power P of the drive motor m Equal to the driver's actual torque demand. After correctionThe output power may be P f The total power of other electric equipment can be P 0 The difference between the corrected output power and the power of other electric loads can be P f -P 0 . If P f -P 0 Is less than or equal to the actual driver demand torque, the second correction parameter is determined to be P f -P 0 (ii) a If P is f -P 0 Is greater than the actual driver demand torque, the second correction parameter is determined to be P m 。
And if the state of charge of the power battery is larger than the first threshold value, comparing the driving power and the sum of the corrected output power and the allowable discharge power of the power battery, and determining a smaller power value as a second correction parameter.
Specifically, the allowable discharge power of the power battery may be P d . If P is d +P f Is less than or equal to the actual driver demand torque, the second correction parameter is determined to be P d +P f (ii) a If P d +P f Is greater than the actual driver demand torque, the second correction parameter is determined to be P m 。
And correcting the driving power based on the second correction parameter to obtain the corrected driving power.
Specifically, after the second correction parameter is determined, the second correction parameter may be determined as the corrected driving power, so as to drive the vehicle motor, and further realize the running and running of the vehicle.
And step 450, controlling the vehicle to run based on the corrected output power and the state of charge to realize energy management of the vehicle.
After the corrected output power of the fuel cell is determined, the driving motor and other electric devices of the vehicle can be powered according to the corrected output power in the state of charge of the power cell, so that energy management of the vehicle is realized.
The embodiment of the invention provides a vehicle energy management method, which comprises the following steps: determining preset output power and a first correction parameter of the fuel cell according to the state of charge and the current temperature of the power cell; if the preset output power is larger than the first correction parameter, correcting the output power of the fuel cell based on the first correction parameter to obtain corrected output power; and controlling the vehicle to operate based on the corrected output power and the state of charge to realize energy management of the vehicle. According to the technical scheme, the output power of the fuel cell is corrected under the state of charge and the current temperature of the power cell, so that the vehicle is controlled to operate, the energy management of the vehicle is realized, the fuel cell is enabled to operate under the output characteristic required by the fuel cell on the premise of meeting the power requirement of the whole vehicle, the power cell cannot be overcharged, the service life of the fuel cell is prolonged, and the safety of a vehicle power supply network is improved.
In addition, the driving power of the driving motor is corrected according to a preset strategy, and the corrected driving power is obtained. The driving power of the driving motor can be corrected while the output power of the fuel cell is corrected, and the power output of the driving motor is controlled according to the SOC of the power cell, the corrected output power of the fuel cell, the available discharging power of the power cell and the driving requirement. The correction of the driving power is realized, the driving of a vehicle motor is further realized, and the running and the operation of the vehicle are further realized.
EXAMPLE III
Fig. 6 is a structural diagram of a vehicle energy management device according to a third embodiment of the present invention, where the device can be applied to the situation of managing the state of charge of a vehicle power battery and the output power of a fuel cell, and improve the service life of the fuel cell and the safety of a vehicle power network. The device may be implemented by software and/or hardware and is typically integrated into a vehicle system.
As shown in fig. 6, the apparatus includes:
the determining module 610 is used for determining the preset output power and the first correction parameter of the fuel cell according to the state of charge and the current temperature of the power cell;
a correcting module 620, configured to correct the output power of the fuel cell based on the first correction parameter if the preset output power is greater than the first correction parameter, so as to obtain a corrected output power;
a control module 630 configured to control a vehicle to operate based on the corrected output power and the state of charge to implement energy management of the vehicle.
According to the technical scheme of the embodiment, the preset output power and the first correction parameter of the fuel cell are determined according to the state of charge and the current temperature of the power cell; if the preset output power is larger than the first correction parameter, correcting the output power of the fuel cell based on the first correction parameter to obtain corrected output power; and controlling the vehicle to operate based on the corrected output power and the state of charge to realize energy management of the vehicle. According to the technical scheme, the output power of the fuel cell is corrected under the state of charge and the current temperature of the power cell, so that the vehicle is controlled to operate, the energy management of the vehicle is realized, the fuel cell is enabled to operate under the output characteristic required by the fuel cell on the premise of meeting the power requirement of the whole vehicle, the power cell cannot be overcharged, the service life of the fuel cell is prolonged, and the safety of a vehicle power supply network is improved.
On the basis of the foregoing embodiment, the determining module 610 is specifically configured to:
determining a correction coefficient of the allowable charging power of the power battery according to the minimum load change interval of the fuel battery, the total energy of the power battery and the allowable power change rate of the power battery under the state of charge and the current temperature;
and determining the product of the correction coefficient of the allowable charging power of the power battery and the allowable charging power of the power battery as the first correction parameter.
On the basis of the above embodiment, according to the total energy of the power battery, a first threshold, a second threshold, a third threshold, and a fourth threshold of the state of charge of the power battery are determined, and accordingly, the determining module is further configured to:
if the state of charge of the power battery is smaller than or equal to the first threshold, determining that the preset output power of the fuel battery is the first output power;
if the state of charge of the power battery is larger than the first threshold and smaller than or equal to the second threshold, determining that the preset output power of the fuel battery is the second output power;
if the state of charge of the power battery is larger than the second threshold and smaller than or equal to a third threshold, determining that the preset output power of the fuel battery is a third output power;
and if the state of charge of the power battery is larger than the fourth threshold, determining that the preset output power of the fuel battery is fourth output power.
On the basis of the foregoing embodiment, the modification module 620 is specifically configured to:
and determining a first correction parameter as the corrected output power.
On the basis of the above embodiment, the apparatus further includes:
and the first execution module is used for correcting the driving power of the driving motor according to a preset strategy to obtain the corrected driving power.
On the basis of the foregoing embodiment, the first execution module is specifically configured to:
if the state of charge of the power battery is smaller than or equal to the first threshold, comparing the driving power with the difference value between the corrected output power and the power of other electric loads, and determining a smaller power value as a second correction parameter;
if the state of charge of the power battery is larger than the first threshold value, comparing the driving power and the sum of the corrected output power and the allowable discharge power of the power battery, and determining a smaller power value as a second correction parameter;
and correcting the driving power based on the second correction parameter to obtain the corrected driving power.
On the basis of the above embodiment, the apparatus further comprises:
and the second execution module is used for determining the preset output power as the output power of the fuel cell if the preset output power is less than or equal to the first correction parameter.
The vehicle energy management device provided by the embodiment of the invention can execute the vehicle energy management method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
Example four
Fig. 7 is a schematic structural diagram of a vehicle according to a fourth embodiment of the present invention, as shown in fig. 7, the vehicle includes a processor 710, a memory 720, and a sensing device 730; the number of processors 710 in the vehicle may be one or more, and one processor 710 is taken as an example in fig. 7; the processor 710, memory 720 and temperature sensor in the vehicle may be connected by a bus or other means, as exemplified by the bus connection in fig. 7.
The memory 720, which is a computer-readable storage medium, may be used to store software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the vehicle energy management method in the embodiments of the present invention (e.g., the determination module 610, the modification module 620, and the control module 630 in the vehicle energy management device). The processor 710 executes various functional applications and data processing of the vehicle, i.e., implements the vehicle energy management method described above, by executing software programs, instructions, and modules stored in the memory 720.
The memory 720 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, memory 720 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 720 can further include memory located remotely from the processor 710, which can be connected to the vehicle over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
And a sensing device 730 for collecting the ambient temperature.
The vehicle provided by the embodiment of the invention can execute the vehicle energy management method provided by the embodiment of the invention, and has corresponding functions and beneficial effects.
EXAMPLE five
Fifth, an embodiment of the present invention also provides a storage medium containing computer executable instructions, which when executed by a computer processor, are configured to perform a method of vehicle energy management, the method comprising:
determining preset output power and a first correction parameter of the fuel cell according to the state of charge and the current temperature of the power cell;
if the preset output power is larger than the first correction parameter, correcting the output power of the fuel cell based on the first correction parameter to obtain corrected output power;
and controlling the vehicle to operate based on the corrected output power and the state of charge to realize energy management of the vehicle.
Of course, the storage medium containing the computer-executable instructions provided by the embodiments of the present invention is not limited to the method operations described above, and may also perform related operations in the vehicle energy management method provided by any embodiments of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention or portions thereof contributing to the prior art may be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the vehicle energy management device, the included units and modules are merely divided according to the functional logic, but are not limited to the above division as long as the corresponding functions can be realized; in addition, the specific names of the functional units are only for the convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing description is only exemplary of the invention and that the principles of the technology may be employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in some detail by the above embodiments, the invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the invention, and the scope of the invention is determined by the scope of the appended claims.
Claims (6)
1. A vehicle energy management method, comprising:
determining preset output power and a first correction parameter of the fuel cell according to the state of charge and the current temperature of the power cell;
if the preset output power is larger than the first correction parameter, correcting the output power of the fuel cell based on the first correction parameter to obtain corrected output power;
controlling the vehicle to operate based on the corrected output power and the state of charge to achieve energy management of the vehicle;
the method comprises the following steps of determining a first correction parameter of a fuel cell according to the state of charge and the current temperature of the power cell, wherein the first correction parameter comprises the following steps:
determining a correction coefficient of the allowable charging power of the power battery according to the minimum load variation interval of the fuel battery, the total energy of the power battery and the allowable power change rate of the power battery under the state of charge and the current temperature;
determining the product of the correction coefficient of the allowable charging power of the power battery and the allowable charging power of the power battery as the first correction parameter;
the minimum load change interval of the fuel cell is the minimum interval of the output power change of the fuel cell, and the allowable power change rate of the power cell under the state of charge and the current temperature is calculated according to a change table of the allowable charging power of the power cell along with the temperature and the SOC;
determining a first threshold value, a second threshold value and a third threshold value of the state of charge of the power battery according to the total energy of the power battery,
wherein, according to the state of charge and the current temperature of the power battery, the preset output power of the fuel battery is determined, and the method comprises the following steps:
if the state of charge of the power battery is smaller than or equal to the first threshold, determining that the preset output power of the fuel battery is the first output power;
if the state of charge of the power battery is larger than the first threshold and smaller than or equal to the second threshold, determining that the preset output power of the fuel battery is the second output power;
if the state of charge of the power battery is larger than the second threshold and smaller than or equal to a third threshold, determining that the preset output power of the fuel battery is a third output power;
if the state of charge of the power battery is larger than the third threshold, determining that the preset output power of the fuel battery is fourth output power;
correcting the driving power of the driving motor according to a preset strategy to obtain the corrected driving power;
wherein, according to the default strategy, revise driving motor's drive power, obtain the drive power after the correction, include:
if the state of charge of the power battery is smaller than or equal to the first threshold, comparing the driving power with the difference value between the corrected output power and the power of other electric loads, and determining a smaller power value as a second correction parameter;
if the state of charge of the power battery is larger than the first threshold value, comparing the driving power and the sum of the corrected output power and the allowable discharge power of the power battery, and determining a smaller power value as a second correction parameter;
and correcting the driving power based on the second correction parameter to obtain the corrected driving power.
2. The vehicle energy management method according to claim 1, wherein correcting the output power of the fuel cell based on the first correction parameter, resulting in a corrected output power, comprises:
and determining a first correction parameter as the corrected output power.
3. The vehicle energy management method of claim 1, further comprising:
and if the preset output power is less than or equal to the first correction parameter, determining the preset output power as the output power of the fuel cell.
4. A vehicle energy management device, comprising:
the determining module is used for determining the preset output power and the first correction parameter of the fuel cell according to the charge state and the current temperature of the power cell;
the correction module is used for correcting the output power of the fuel cell based on the first correction parameter if the preset output power is larger than the first correction parameter, so as to obtain corrected output power;
the control module is used for controlling the vehicle to operate based on the corrected output power and the state of charge so as to realize energy management of the vehicle;
the first execution module is used for correcting the driving power of the driving motor according to a preset strategy to obtain the corrected driving power; wherein the determining module is specifically configured to:
determining a correction coefficient of the allowable charging power of the power battery according to the minimum load variation interval of the fuel battery, the total energy of the power battery and the allowable power change rate of the power battery under the state of charge and the current temperature;
determining the product of the correction coefficient of the allowable charging power of the power battery and the allowable charging power of the power battery as the first correction parameter;
the minimum load change interval of the fuel cell is the minimum interval of the output power change of the fuel cell, and the allowable power change rate of the power cell under the state of charge and the current temperature is calculated according to a change table of the allowable charging power of the power cell along with the temperature and the SOC;
wherein the determining module is further configured to:
determining a first threshold, a second threshold and a third threshold of the state of charge of the power battery according to the total energy of the power battery;
if the state of charge of the power battery is smaller than or equal to the first threshold, determining that the preset output power of the fuel battery is the first output power;
if the state of charge of the power battery is larger than the first threshold and smaller than or equal to the second threshold, determining that the preset output power of the fuel battery is a second output power;
if the state of charge of the power battery is larger than the second threshold and smaller than or equal to a third threshold, determining that the preset output power of the fuel battery is a third output power;
if the state of charge of the power battery is larger than the third threshold, determining that the preset output power of the fuel battery is fourth output power;
the first execution module is specifically configured to:
if the state of charge of the power battery is smaller than or equal to the first threshold, comparing the driving power with the difference value between the corrected output power and the power of other electric loads, and determining a smaller power value as a second correction parameter;
if the state of charge of the power battery is larger than the first threshold value, comparing the driving power and the sum of the corrected output power and the allowable discharge power of the power battery, and determining a smaller power value as a second correction parameter;
and correcting the driving power based on the second correction parameter to obtain the corrected driving power.
5. A vehicle, characterized in that the vehicle comprises:
one or more processors;
storage means for storing one or more programs;
the sensing device is used for acquiring the ambient temperature;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the vehicle energy management method of any of claims 1-3.
6. A storage medium containing computer executable instructions for performing the vehicle energy management method of any of claims 1-3 when executed by a computer processor.
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| CN114572057B (en) * | 2022-03-23 | 2024-03-19 | 浙江吉利控股集团有限公司 | Fuel cell energy control method, device, equipment and vehicle |
| CN114889499B (en) * | 2022-05-18 | 2024-03-26 | 中汽创智科技有限公司 | Control method and device for fuel cell-lithium battery hybrid power system |
| CN115303133A (en) * | 2022-10-12 | 2022-11-08 | 中通客车股份有限公司 | Multi-gear hysteresis control method and system for fuel cell system |
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| JP6329202B2 (en) * | 2016-06-08 | 2018-05-23 | 本田技研工業株式会社 | Fuel cell vehicle and starting method thereof |
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