CN114400390A - Vehicle low-temperature heating method, device and system and storage medium - Google Patents
Vehicle low-temperature heating method, device and system and storage medium Download PDFInfo
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- CN114400390A CN114400390A CN202210142486.7A CN202210142486A CN114400390A CN 114400390 A CN114400390 A CN 114400390A CN 202210142486 A CN202210142486 A CN 202210142486A CN 114400390 A CN114400390 A CN 114400390A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000007599 discharging Methods 0.000 claims description 26
- 239000007858 starting material Substances 0.000 claims description 24
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 13
- 238000004590 computer program Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000007600 charging Methods 0.000 abstract description 15
- 238000010248 power generation Methods 0.000 description 37
- 238000010586 diagram Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000010278 pulse charging Methods 0.000 description 3
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/443—Methods for charging or discharging in response to temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
- B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The application provides a vehicle low-temperature heating method, a device, a system and a storage medium, comprising the following steps: when the ambient temperature is less than 0 ℃, obtaining the current actual output power of the vehicle battery pack, obtaining the discharge limiting power of the vehicle battery pack under the current ambient temperature in the current state of charge, taking the smaller of the discharge limiting power and the target output power of the vehicle as the target limiting power, subtracting the current actual output power from the target limiting power to obtain a power deviation, carrying out proportional integral adjustment on the power deviation to obtain a calculated power, and adding the calculated power to the current generating power of the belt-driven starting generator as a total target power so as to enable the generator to generate power according to the total target power. Therefore, when the vehicle is in a low-temperature environment, the power supply for the vehicle load and the heating film is realized, meanwhile, the generated power and the consumed power of the vehicle battery pack tend to be balanced, the charging of the vehicle battery pack at a low temperature is avoided, the touring car can be prevented from being limited by the ambient temperature and the like during the trip, and the dependence on the touring car camp is reduced.
Description
Technical Field
The application relates to the field of vehicle control, in particular to a vehicle low-temperature heating method and device.
Background
In recent years, with the continuous development of social economy, the consumption demands of people on self-driving travel, motor home travel and the like are increased day by day, so that the motor home market in China is rapidly increased. A common motor home system in the market is a 48V double-generator system, and two sets of power generation systems are usually additionally arranged on the 48V double-generator system to realize power supply. The system is characterized by comprising two sets of power generation systems, wherein one set is a 12V power generation system of an original Vehicle, the other set is a 48V Belt drive Starter Generator (BSG) power generation system controlled by a Vehicle Control Unit (VCU), and the BSG power generation system is provided with a set of high-power battery pack.
The power generation system can adjust the power generation power in real time by calculating the load power, the power generation power is controllable and efficient, the whole 48V system is protected, and the economical efficiency is good. The system still has limitations, and the motor homes of the type are usually equipped with a set of lithium iron phosphate batteries. The battery pack has the advantages of low price and durability, and has the defects of poor low-temperature performance, incapability of low-temperature charging, easy damage of a battery cell caused by forced charging, and rechargeable performance after the battery pack is subjected to heating treatment.
This requires that the BSG not only provide power for heating, but also not be able to charge the battery pack with power during heating. The ideal method is to disconnect the 48V system of the battery pack during heating and supply power to the heating film through BSG power generation alone to realize the heating function. However, the BSG motor does not support the passive power generation and cannot independently generate power after the 48V is disconnected. This makes the system only work above 0 ℃, can only work below 0 ℃ after the battery pack is heated to above 0 ℃ through 220V commercial power. The touring car depends on the touring car camp more when going out in winter, the use limitation is large, and the user experience is influenced.
Disclosure of Invention
In view of the above, an object of the present application is to provide a vehicle low-temperature heating method and apparatus, which can protect a vehicle battery under a heating condition while achieving vehicle low-temperature heating, so as to supply power to a load. Make the car as a house trip can not receive restriction such as ambient temperature, reduce the reliance to car as a house camp to can reduce car as a house use cost, promote user experience.
In order to achieve the purpose, the technical scheme is as follows:
in a first aspect, an embodiment of the present application provides a vehicle low-temperature heating method, including:
when the ambient temperature is less than 0 ℃, controlling the vehicle battery pack to start discharging and heating;
acquiring actual voltage and actual current output by current discharge;
calculating to obtain the current actual output power according to the actual voltage and the actual current;
acquiring the discharge limiting power of the vehicle battery pack at the current ambient temperature under the current charge state;
taking the smaller of the discharge limit power and the target output power of the vehicle battery pack as the target limit power of the vehicle battery pack so that the vehicle battery pack generates power according to the target limit power;
subtracting the current actual output power from the target limit power to obtain a power deviation;
carrying out proportional integral adjustment on the power deviation to obtain calculated power;
and adding the calculated power and the current generated power of the belt-driven starter generator as a total target power so that the belt-driven starter generator generates power according to the total target power.
In one possible implementation, the method further includes:
acquiring the generated power generated according to the total target power;
when the generated power is greater than the vehicle load power, reducing the generated power below the vehicle load power through proportional-integral regulation;
increasing the generated power to the total target power by proportional-integral adjustment when the generated power is less than the vehicle load power.
In a possible implementation manner, the calculating the current actual output power according to the actual voltage and the actual current includes:
multiplying the actual voltage by the actual current to obtain a first power;
and filtering the first power to obtain the current actual output power.
In one possible implementation, the vehicle battery pack includes:
lithium iron phosphate battery pack.
In a second aspect, an embodiment of the present application provides a vehicle low-temperature heating apparatus, including:
the heating unit is used for controlling the vehicle battery pack to start discharging and heating when the ambient temperature is less than 0 ℃;
the first acquisition unit is used for acquiring the actual voltage and the actual current output by the current discharge;
the first calculating unit is used for calculating to obtain the current actual output power according to the actual voltage and the actual current;
the second acquisition unit is used for acquiring the discharge limiting power of the vehicle battery pack at the current ambient temperature under the current charge state;
a comparison unit configured to use a smaller one of the discharge limit power and a target output power of the vehicle battery pack as a target limit power of the vehicle battery pack, so that the vehicle battery pack generates power according to the target limit power;
the second calculation unit is used for subtracting the current actual output power from the target limit power to obtain a power deviation;
the first adjusting unit is used for carrying out proportional integral adjustment on the power deviation to obtain calculated power;
and the third calculating unit is used for adding the calculated power to the current generated power of the belt-driven starter generator to be used as the total target power so as to enable the belt-driven starter generator to generate power according to the total target power.
In one possible implementation, the apparatus further includes:
a third obtaining unit, configured to obtain the generated power generated according to the total target power;
a second adjusting unit for reducing the generated power below the vehicle load power by proportional-integral adjustment when the generated power is greater than the vehicle load power;
a third adjusting unit for increasing the generated power to the total target power by proportional-integral adjustment when the generated power is smaller than the vehicle load power.
In one possible implementation, the first computing unit includes:
the first calculating subunit is used for calculating the actual voltage multiplied by the actual current to obtain first power;
and the filtering unit is used for filtering the first power to obtain the current actual output power.
In one possible implementation, the vehicle battery pack includes:
lithium iron phosphate battery pack.
In a third aspect, an embodiment of the present application provides a vehicle low-temperature heating system, including:
a memory for storing a computer program;
a processor for implementing the steps of the vehicle low temperature heating method as described above when executing the computer program.
In a fourth aspect, embodiments of the present application provide a computer storage medium having a computer program stored thereon, where the computer program is processed and executed to implement the steps of the vehicle low-temperature heating method as described above.
The embodiment of the application provides a vehicle low-temperature heating method, a vehicle low-temperature heating device, a vehicle low-temperature heating system and a storage medium, wherein the vehicle low-temperature heating method comprises the following steps: when the ambient temperature is less than 0 ℃, controlling the vehicle battery pack to start discharging and heating, acquiring actual voltage and actual current output by current discharging, calculating according to the actual voltage and the actual current to obtain current actual output power, acquiring discharging limiting power of the vehicle battery pack at the current ambient temperature in the current state of charge, taking the smaller of the discharging limiting power and the target output power of the vehicle as target limiting power, subtracting the current actual output power from the target limiting power to obtain power deviation, carrying out proportional integral adjustment on the power deviation to obtain calculated power, and adding the calculated power to the current generating power of the belt-driven starting generator to be used as total target power so that the belt-driven starting generator generates power according to the total target power. Therefore, when the vehicle is in a low-temperature environment, the vehicle battery can be protected under a heating condition, the power generation power and the power consumption power tend to be balanced while the power is supplied to the vehicle load and the heating film, the charging of the vehicle battery pack at a low temperature is avoided, the touring car can be free from the limitation of the environmental temperature and the like during the trip, the dependence on the touring car camp is reduced, the using cost of the touring car can be reduced, and the user experience is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram illustrating maximum pulse charging current of a lithium iron phosphate battery pack in 30 seconds at different states of charge and at different temperatures according to an embodiment of the present disclosure;
FIG. 2 is a flow chart illustrating a method for low temperature heating of a vehicle according to an embodiment of the present disclosure;
FIG. 3 illustrates a schematic diagram of a power generation system provided by an embodiment of the present application;
fig. 4 is a schematic diagram illustrating a maximum pulse discharge current of a lithium iron phosphate battery pack in 30 seconds at different states of charge and at different temperatures according to an embodiment of the present application;
fig. 5 shows a schematic diagram of a vehicle low-temperature heating device provided by an embodiment of the application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways than those described herein, and it will be apparent to those of ordinary skill in the art that the present application is not limited by the specific embodiments disclosed below.
As described in the background art, in recent years, with the continuous development of social economy, people have increasingly increased consumption demands for "self-driving travel", "motor home travel", and the like, so that the motor home market in China is rapidly increased.
The applicant finds that part of motor homes in the market are still refitted after purchasing ready-made chassis and power assemblies, the technology is too simple, a complete development period is not passed, and safety and durability cannot be guaranteed. There are two main types of car as a house systems in the market, which are 12V single-hair systems and 48V double-hair systems.
The 12V single-shot system is realized by modifying a 12V generator with higher power and a lead-acid battery. The generated power is uncontrollable and has positive correlation with the rotating speed of the engine, and the safety is poor. And the efficiency of 12V inversion into 220V is low, once the conditions of overlarge load and low engine rotating speed occur, the generated power is probably smaller than the load consumed power, the lead-acid battery feeding is easily caused, the whole vehicle electrical appliance is not available, and the user experience is influenced.
The 48V double-power generation system is generally additionally provided with two sets of power generation systems to realize power supply. The system is characterized by comprising two sets of power generation systems, wherein one set is a 12V power generation system of an original Vehicle, the other set is a 48V Belt drive Starter Generator (BSG) power generation system controlled by a Vehicle Control Unit (VCU), and the BSG power generation system is provided with a set of high-power battery pack.
The power generation system can adjust the power generation power in real time by calculating the load power, the power generation power is controllable and efficient, the whole 48V system is protected, and the economical efficiency is good. The system still has limitations, and the motor homes of the type are usually equipped with a set of lithium iron phosphate batteries. The battery pack has the advantages of low price and durability, and has the defects of poor low-temperature performance, incapability of low-temperature charging, easy damage of a battery cell caused by forced charging, and rechargeable performance after the battery pack is subjected to heating treatment.
Referring to fig. 1, it can be seen that when the ambient temperature T is less than 0 ℃, the charging current of the lithium iron phosphate battery pack is always 0 no matter what state of charge the lithium iron phosphate battery pack is in, that is, low-temperature charging cannot be performed, for the maximum pulse charging current (30s cell max pulse charging current) of the battery in 30 seconds corresponding to different states of charge (SOC) and different temperatures of the lithium iron phosphate battery pack.
This requires that the BSG not only provide power for heating, but also not be able to charge the battery pack with power during heating. The ideal method is to disconnect the 48V system of the battery pack during heating and supply power to the heating film through BSG power generation alone to realize the heating function. However, the BSG motor does not support the passive power generation and cannot independently generate power after the 48V is disconnected. This makes the system only work above 0 ℃, can only work below 0 ℃ after the battery pack is heated to above 0 ℃ through 220V commercial power. The touring car depends on the touring car camp more when going out in winter, the use limitation is large, and the user experience is influenced.
In order to solve the above technical problem, embodiments of the present application provide a vehicle low-temperature heating method, apparatus, system and storage medium, including: when the ambient temperature is less than 0 ℃, controlling the vehicle battery pack to start discharging and heating, acquiring actual voltage and actual current output by current discharging, calculating according to the actual voltage and the actual current to obtain current actual output power, acquiring discharging limiting power of the vehicle battery pack at the current ambient temperature in the current state of charge, taking the smaller of the discharging limiting power and the target output power of the vehicle as target limiting power, subtracting the current actual output power from the target limiting power to obtain power deviation, carrying out proportional integral adjustment on the power deviation to obtain calculated power, and adding the calculated power to the current generating power of the belt-driven starting generator to be used as total target power so that the belt-driven starting generator generates power according to the total target power. Therefore, when the vehicle is in a low-temperature environment, the vehicle battery can be protected under a heating condition, the power generation power and the power consumption power tend to be balanced while the power is supplied to the vehicle load and the heating film, the charging of the vehicle battery pack at a low temperature is avoided, the touring car can be free from the limitation of the environmental temperature and the like during the trip, the dependence on the touring car camp is reduced, the using cost of the touring car can be reduced, and the user experience is improved.
Exemplary method
Referring to fig. 2, a flowchart of a vehicle low-temperature heating method provided in an embodiment of the present application includes:
s101: and when the ambient temperature is less than 0 ℃, controlling the vehicle battery pack to start discharging and heating.
In the embodiment of the application, the temperature sensor mounted on the vehicle can be used for acquiring the ambient temperature around the vehicle in real time, and when the ambient temperature is below 0 ℃, the vehicle heating mode can be entered to control the vehicle battery pack to start discharging and heating.
Specifically, referring to fig. 3, a schematic diagram of a power generation system provided in the embodiment of the present application is shown, where one set is a 12V power generation system of an original vehicle, and the other set is a 48VBSG power generation system controlled by a VCU and is equipped with a set of high-power battery packs. The 12V power generation system comprises a 12V motor 3 connected with the engine 1, a 12V battery pack 4 connected with the 12V motor 3 and a 12V furniture module special for supplying power to furniture of a motor home; the 12V power generation system can be connected with a 48VBSG power generation system through a direct current module DCDC (direct current) 5; the 48VBSG power generation system comprises a 48V motor 2 and a 48V battery pack 6 connected with the 48V motor, and when a motor home is used in a camp, 220V commercial power can be connected with a charging and inverting integrated machine 7 connected with the 48V battery pack for charging; the power generation system may further include a vehicle control unit 11, a motor controller 13, and a battery management system 12.
The real-time environment temperature acquired by the temperature sensor can be judged by using the vehicle control unit 11 and the battery management system 12 to judge whether the vehicle enters a heating mode, when the current environment temperature is judged to be below 0 ℃, the vehicle heating mode can be entered, and the vehicle control unit 11 controls the vehicle battery pack to start discharging and heating by combining with the battery management system 12.
In one possible implementation, the vehicle battery pack may be a lithium iron phosphate battery pack, which has the advantage of being inexpensive and durable.
S102: and acquiring the actual voltage and the actual current output by the current discharge.
S103: and calculating to obtain the current actual output power according to the actual voltage and the actual current.
In the present embodiment, the applicant has studied that since the belt-driven starter generator does not support the passive power generation, it is required that the vehicle battery pack supplies a certain voltage to allow the belt-driven starter generator to supply power to the load (including the heating film) of the vehicle, and it is impossible to generate power independently after the vehicle battery pack is disconnected.
If the vehicle battery pack is discharged normally, the total power generation power of the vehicle battery pack and the belt-driven starter generator is possibly greater than the total power consumption of the vehicle load, redundant electric energy may be charged into the battery pack in the process of discharging and heating the heating film, and the electric core is easily damaged by forced charging.
In order to avoid the above situation, the actual voltage and the actual current of the current discharging output may be obtained first, that is, the battery management system 12 may obtain the output actual voltage U and the actual current I of the battery pack discharging heating first, and the current actual output power, that is, the current actual output power of the vehicle battery pack may be calculated according to the actual voltage U and the actual current I.
In a possible implementation manner, the actual voltage may be multiplied by the actual current to calculate a first power, the first power is filtered to obtain a current actual output power Pa, and the current actual output power Pa after filtering reduces the presence of clutter, which is more convenient for observation.
S104: and acquiring the discharge limit power of the vehicle battery pack at the current ambient temperature under the current charge state.
S105: and taking the smaller of the discharge limiting power and the target output power of the vehicle battery pack as the target limiting power of the vehicle battery pack so that the vehicle battery pack generates power according to the target limiting power.
In the embodiment of the present application, the discharge limit power of the vehicle battery pack at the current state of charge at the current ambient temperature may be obtained through the discharge characteristic of the vehicle battery pack, that is, referring to fig. 4, for the vehicle battery pack provided in the embodiment of the present application, the maximum pulse discharge current (30s cell max pulse discharge current) of the battery in 30 seconds corresponding to different states of charge and different temperatures may be obtained, and according to the fig. 4, the discharge limit power Pd of the vehicle battery pack at the current state of charge at the current ambient temperature, that is, the power limit value that can be output by discharge at the current state of charge of the vehicle battery pack at the current ambient temperature may be obtained.
In addition, in order to prevent the excessive discharge output power of the vehicle battery pack from influencing the battery pack, a preset target output power Pt of the vehicle battery pack is provided, in order to take account of the power limit value which can be output by the discharge of the vehicle battery pack in the current charge state under the current ambient temperature, the discharge limiting power and the target output power can be compared to judge whether the discharge limiting power is greater than the target output power, and when the discharge limiting power is less than the target output power, the discharge limiting power is taken as the target limiting power Plim(ii) a When the discharge limiting power is larger than the target output power, taking the target output power as the target limiting power; so that the vehicle battery pack generates power according to the target limit power.
S106: and subtracting the current actual output power from the target limit power to obtain a power deviation.
S107: carrying out proportional integral adjustment on the power deviation to obtain calculated power;
s108: and adding the calculated power and the current generated power of the belt-driven starter generator as a total target power so that the belt-driven starter generator generates power according to the total target power.
In the embodiment of the application, the target limiting power may be reduced from the current actual output power to obtain the power deviation, that is, in order to make the generated power and the consumed power of the vehicle battery pack tend to be balanced, the generated power of the current vehicle battery pack needs to be adjusted to the target limiting power, after the generated power of the vehicle battery pack is adjusted to the target limiting power, the target limiting power is small, and in order to ensure normal power supply of a vehicle load, a belt is required to drive a starter generator to perform power generation supplement.
In addition, in order to reduce the error of the obtained power deviation and improve the stability of the whole system, the power deviation can be subjected to Proportional Integral (PI) adjustment to obtain calculated power, the calculated power and the current generated power of the belt-driven starter generator are taken as total target power, so that the belt-driven starter generator generates power according to the total target power, most of the power is generated by the belt-driven starter generator, and a small part of the power is supplied to a load by a vehicle battery pack,
for example, the total power supply required by the vehicle load is 1000W, which can be provided by the vehicle battery pack to 100W, and the belt-driven starter generator can be started to generate power, and most of the remaining power (900W) is provided by the belt-driven starter generator, so that the situation that the generated power is greater than the consumed power of the vehicle load, which causes the forced charging of the vehicle battery pack to damage the battery cell, is avoided.
In a possible implementation mode, the power of the generated power generated by the vehicle belt-driven starter generator according to the total target power is not necessarily equal to the calculated total target power, so that the generated power generated according to the total target power can be obtained.
The embodiment of the application provides a low-temperature heating method for a vehicle, which comprises the following steps: when the ambient temperature is less than 0 ℃, controlling the vehicle battery pack to start discharging and heating, acquiring actual voltage and actual current output by current discharging, calculating according to the actual voltage and the actual current to obtain current actual output power, acquiring discharging limiting power of the vehicle battery pack at the current ambient temperature in the current state of charge, taking the smaller of the discharging limiting power and the target output power of the vehicle as target limiting power, subtracting the current actual output power from the target limiting power to obtain power deviation, carrying out proportional integral adjustment on the power deviation to obtain calculated power, and adding the calculated power to the current generating power of the belt-driven starting generator to be used as total target power so that the belt-driven starting generator generates power according to the total target power. Therefore, when the vehicle is in a low-temperature environment, the vehicle battery can be protected under a heating condition, the power generation power and the power consumption power tend to be balanced while the power is supplied to the vehicle load and the heating film, the charging of the vehicle battery pack at a low temperature is avoided, the touring car can be free from the limitation of the environmental temperature and the like during the trip, the dependence on the touring car camp is reduced, the using cost of the touring car can be reduced, and the user experience is improved.
Exemplary devices
Referring to fig. 5, a schematic diagram of a vehicle low-temperature heating device provided in an embodiment of the present application includes:
a heating unit 501 for controlling the vehicle battery pack to start discharge heating when the ambient temperature is less than 0 ℃;
a first obtaining unit 502, configured to obtain an actual voltage and an actual current output by the current discharge;
the first calculating unit 503 is configured to calculate current actual output power according to the actual voltage and the actual current;
a second obtaining unit 504, configured to obtain a discharge limiting power of the vehicle battery pack at a current state of charge at a current ambient temperature;
a comparison unit 505 configured to use a smaller one of the discharge limit power and a target output power of the vehicle battery pack as a target limit power of the vehicle battery pack, so that the vehicle battery pack generates power according to the target limit power;
a second calculating unit 506, configured to subtract the current actual output power from the target limited power to obtain a power deviation;
the first adjusting unit 507 is configured to perform proportional-integral adjustment on the power deviation to obtain a calculated power;
and a third calculating unit 508, configured to add the calculated power to the current generated power of the belt-driven starter generator as a total target power, so that the belt-driven starter generator generates power according to the total target power.
In one possible implementation, the apparatus further includes:
a third obtaining unit, configured to obtain the generated power generated according to the total target power;
a second adjusting unit for reducing the generated power below the vehicle load power by proportional-integral adjustment when the generated power is greater than the vehicle load power;
a third adjusting unit for increasing the generated power to the total target power by proportional-integral adjustment when the generated power is smaller than the vehicle load power.
In one possible implementation, the first computing unit includes:
the first calculating subunit is used for calculating the actual voltage multiplied by the actual current to obtain first power;
and the filtering unit is used for filtering the first power to obtain the current actual output power.
In one possible implementation, the vehicle battery pack includes:
lithium iron phosphate battery pack.
The embodiment of the application provides a vehicle low-temperature heating device, and a method using the device comprises the following steps: when the ambient temperature is less than 0 ℃, controlling the vehicle battery pack to start discharging and heating, acquiring actual voltage and actual current output by current discharging, calculating according to the actual voltage and the actual current to obtain current actual output power, acquiring discharging limiting power of the vehicle battery pack at the current ambient temperature in the current state of charge, taking the smaller of the discharging limiting power and the target output power of the vehicle as target limiting power, subtracting the current actual output power from the target limiting power to obtain power deviation, carrying out proportional integral adjustment on the power deviation to obtain calculated power, and adding the calculated power to the current generating power of the belt-driven starting generator to be used as total target power so that the belt-driven starting generator generates power according to the total target power. Therefore, when the vehicle is in a low-temperature environment, the vehicle battery can be protected under a heating condition, the power generation power and the power consumption power tend to be balanced while the power is supplied to the vehicle load and the heating film, the charging of the vehicle battery pack at a low temperature is avoided, the touring car can be free from the limitation of the environmental temperature and the like during the trip, the dependence on the touring car camp is reduced, the using cost of the touring car can be reduced, and the user experience is improved.
On the basis of the above embodiments, the present application provides a vehicle low-temperature heating system, including:
a memory for storing a computer program;
a processor for implementing the steps of the vehicle low temperature heating method as described above when executing the computer program.
On the basis of the above embodiments, the present application provides a computer storage medium having a computer program stored thereon, where the computer program is processed and executed to implement the steps of the vehicle low-temperature heating method as described above.
The computer storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for device embodiments, since they are substantially similar to method embodiments, they are described relatively simply, and reference may be made to some descriptions of the method embodiments for relevant points.
The foregoing is merely a preferred embodiment of the present application and, although the present application discloses the foregoing preferred embodiments, the present application is not limited thereto. Those skilled in the art can now make numerous possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the claimed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still fall within the protection scope of the technical solution of the present application without departing from the content of the technical solution of the present application.
Claims (10)
1. A vehicle low-temperature heating method, characterized by comprising:
when the ambient temperature is less than 0 ℃, controlling the vehicle battery pack to start discharging and heating;
acquiring actual voltage and actual current output by current discharge;
calculating to obtain the current actual output power according to the actual voltage and the actual current;
acquiring the discharge limiting power of the vehicle battery pack at the current ambient temperature under the current charge state;
taking the smaller of the discharge limit power and the target output power of the vehicle battery pack as the target limit power of the vehicle battery pack so that the vehicle battery pack generates power according to the target limit power;
subtracting the current actual output power from the target limit power to obtain a power deviation;
carrying out proportional integral adjustment on the power deviation to obtain calculated power;
and adding the calculated power and the current generated power of the belt-driven starter generator as a total target power so that the belt-driven starter generator generates power according to the total target power.
2. The method of claim 1, further comprising:
acquiring the generated power generated according to the total target power;
when the generated power is greater than the vehicle load power, reducing the generated power below the vehicle load power through proportional-integral regulation;
increasing the generated power to the total target power by proportional-integral adjustment when the generated power is less than the vehicle load power.
3. The method of claim 1, wherein calculating the present actual output power from the actual voltage and the actual current comprises:
multiplying the actual voltage by the actual current to obtain a first power;
and filtering the first power to obtain the current actual output power.
4. The method of claim 1, wherein the vehicle battery pack comprises:
lithium iron phosphate battery pack.
5. A vehicular low-temperature heating apparatus, characterized by comprising:
the heating unit is used for controlling the vehicle battery pack to start discharging and heating when the ambient temperature is less than 0 ℃;
the first acquisition unit is used for acquiring the actual voltage and the actual current output by the current discharge;
the first calculating unit is used for calculating to obtain the current actual output power according to the actual voltage and the actual current;
the second acquisition unit is used for acquiring the discharge limiting power of the vehicle battery pack at the current ambient temperature under the current charge state;
a comparison unit configured to use a smaller one of the discharge limit power and a target output power of the vehicle battery pack as a target limit power of the vehicle battery pack, so that the vehicle battery pack generates power according to the target limit power;
the second calculation unit is used for subtracting the current actual output power from the target limit power to obtain a power deviation;
the first adjusting unit is used for carrying out proportional integral adjustment on the power deviation to obtain calculated power;
and the third calculating unit is used for adding the calculated power to the current generated power of the belt-driven starter generator to be used as the total target power so as to enable the belt-driven starter generator to generate power according to the total target power.
6. The apparatus of claim 5, further comprising:
a third obtaining unit, configured to obtain the generated power generated according to the total target power;
a second adjusting unit for reducing the generated power below the vehicle load power by proportional-integral adjustment when the generated power is greater than the vehicle load power;
a third adjusting unit for increasing the generated power to the total target power by proportional-integral adjustment when the generated power is smaller than the vehicle load power.
7. The apparatus of claim 5, wherein the first computing unit comprises:
the first calculating subunit is used for calculating the actual voltage multiplied by the actual current to obtain first power;
and the filtering unit is used for filtering the first power to obtain the current actual output power.
8. The apparatus of claim 5, wherein the vehicle battery pack comprises:
lithium iron phosphate battery pack.
9. A vehicle cryogenic heating system, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the vehicle low temperature heating method according to any one of claims 1 to 4 when executing the computer program.
10. A computer storage medium, characterized in that the computer storage medium has stored thereon a computer program which, when being processed and executed, carries out the steps of the vehicle low-temperature heating method according to any one of claims 1 to 4.
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| CN202210142486.7A CN114400390A (en) | 2022-02-16 | 2022-02-16 | Vehicle low-temperature heating method, device and system and storage medium |
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