A control method for high-voltage load working state during automobile fast charging and related equipment

Abstract

The application belongs to the technical field of automobile control, and discloses a control method for high-voltage load working state during automobile fast charging and related equipment. The method can accurately identify whether the automobile meets the fast charging condition through comprehensive judgment based on the current battery allowed discharge power and the power required by all vehicle controllers, effectively avoiding a series of problems that may be caused by blindly fast charging when the battery charging and discharging capacity is limited. Meanwhile, during the fast charging process, the method also collects the battery allowed discharge power and the rated discharge power of the direct current-direct current converter in real time, and judges whether to send a high-voltage load disable request on the basis, preferentially ensures that the DCDC has sufficient power to charge the lead-acid storage battery, maintains the normal power supply of all vehicle controllers, avoids the low-voltage feeding situation caused by the continuous consumption of the lead-acid storage battery by all vehicle controllers, improves the reliability of the charging process, and thus effectively improves the use safety and user experience of the vehicle in extreme environments.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of automobile control, and particularly relates to a control method for high-voltage load working state during automobile fast charging and related equipment. BACKGROUND

[0002] Under the background of global advocacy of green travel and sustainable development, pure electric vehicles have a rising share in the automobile market year by year due to their significant advantages such as zero emissions and low noise. With the strong support of policies, the pure electric vehicle industry is developing rapidly, the energy density of the battery system is continuously improving, the efficiency of the motor system is continuously optimized, and the whole vehicle control technology is becoming increasingly mature.

[0003] With the promotion of the "new four modernizations" of automobiles, namely, electrification, intelligentization, networking, and sharing, consumers have higher requirements for the functions and performance of electric vehicles. Today, the use scenarios of electric vehicles are increasingly complex and diverse, and users not only use electric vehicles for daily urban commuting, but also rely on them in long-distance travel, extreme weather conditions, and other situations. However, in some extreme environments, such as extremely cold regions, electric vehicles face many challenges. When the vehicle is parked in an extremely cold region for a period of time, the temperature of the electric core will drop significantly. When the temperature of the electric core is below a certain value, the charging and discharging capacity of the battery will be severely limited. In the direct current fast charging scenario, if the vehicle is in the powered-on state and does not identify and judge the discharging capacity of the battery before directly starting charging, a series of problems will be caused. Since the charging and discharging capacity of the power battery is limited, high-voltage loads in the vehicle, such as air conditioning compressors and electric power steering systems, will continue to work and divert part of the high-voltage power when the vehicle is powered on. This will result in insufficient discharging power of the DCDC (Direct Current - Direct Current Converter) output to adequately supplement the lead-acid battery. At the same time, the controllers of the whole vehicle will continuously consume the power of the lead-acid battery to maintain normal operation, which may eventually lead to low-voltage feeding, making some functions of the vehicle unable to operate normally, seriously affecting user experience and the safety of the vehicle.

[0004] Therefore, there is currently a lack of an efficient and feasible control method for the high-voltage load working state during fast charging in extreme environments, which results in insufficient DCDC power to supplement the lead-acid battery and the consumption of the lead-acid battery power by the controllers of the whole vehicle, thereby causing low-voltage feeding. SUMMARY

[0005] The present application provides a control method for high-voltage load working state during automobile fast charging and related equipment to solve the technical problem of the lack of an efficient and feasible control method for the high-voltage load working state during fast charging in extreme environments, which results in insufficient DCDC power to supplement the lead-acid battery and the consumption of the lead-acid battery power by the controllers of the whole vehicle, thereby causing low-voltage feeding.

[0006] In order to achieve the above object, the present application adopts the following technical solutions:

[0007] A control method of high-voltage load working state during fast charging of an automobile, comprising:

[0008] Judging whether the automobile meets the fast charging condition based on the current battery allowable discharge power and the power required for working of all controllers of the automobile.

[0009] During the fast charging process, judging whether to send a high-voltage load disabling request based on the real-time collected battery allowable discharge power and the rated discharge power of a DC-DC converter.

[0010] Further, before the step of judging whether the automobile meets the fast charging condition based on the current battery allowable discharge power and the power required for working of all controllers of the automobile, the method further comprises:

[0011] Collecting the current battery cell temperature based on the received DC charging port connection signal.

[0012] Calculating the current battery allowable discharge power based on the current battery cell temperature and a preset battery cell temperature and discharge power relationship model.

[0013] Further, the preset battery cell temperature and discharge power relationship model is expressed as:

[0014]

[0015] In the formula, P represents the battery allowable discharge power, P0 represents the standard discharge power of the battery cell at a reference temperature, T represents the current battery cell temperature, T0 represents the reference temperature, and k represents the temperature coefficient.

[0016] Further, the step of judging whether the automobile meets the fast charging condition based on the current battery allowable discharge power and the power required for working of all controllers of the automobile comprises:

[0017] Comparing the current battery allowable discharge power with the power required for working of all controllers of the automobile.

[0018] If the current battery allowable discharge power is greater than the power required for working of all controllers of the automobile, it is judged that the automobile meets the fast charging condition; otherwise, it is judged that the automobile does not meet the fast charging condition.

[0019] Further, before the step of judging whether to send a high-voltage load disabling request based on the real-time collected battery allowable discharge power and the rated discharge power of the DC-DC converter during the fast charging process, the method further comprises:

[0020] When the fast charging starts, sending a DC-DC converter working request instruction based on a fast charging start signal.

[0021] Start the DC-DC converter based on the received DC-DC converter operation start instruction.

[0022] Further, the in the fast charging process, based on the real-time acquisition of the battery allowed discharge power and the rated discharge power of the DC-DC converter, whether to issue a high-voltage load disable request, comprising:

[0023] In the fast charging process, the real-time acquisition of the battery allowed discharge power and the rated discharge power of the DC-DC converter are compared in real time;

[0024] If the real-time acquisition of the battery allowed discharge power is less than the rated discharge power of the DC-DC converter, a high-voltage load disable request is issued; otherwise, no response is made.

[0025] Further, the in the fast charging process, based on the real-time acquisition of the battery allowed discharge power and the rated discharge power of the DC-DC converter, whether to issue a high-voltage load disable request, comprising:

[0026] If the high-voltage load has been disabled, the vehicle-mounted large screen displays a high-voltage load disable prompt information according to the key-on signal of the automobile.

[0027] A control system for the working state of high-voltage load during automobile fast charging, comprising:

[0028] The first judging module is configured to judge whether the automobile meets the fast charging condition based on the current battery allowed discharge power and the power required for the operation of all vehicle controllers.

[0029] The second judging module is configured to judge whether to issue a high-voltage load disable request based on the real-time acquisition of the battery allowed discharge power and the rated discharge power of the DC-DC converter in the fast charging process.

[0030] An apparatus, comprising:

[0031] A memory for storing a computer program;

[0032] A processor for executing the computer program to implement the steps of the control method for the working state of high-voltage load during automobile fast charging.

[0033] A computer readable storage medium storing a computer program, the computer program being executed by a processor to implement the steps of the control method for the working state of high-voltage load during automobile fast charging.

[0034] Compared with the prior art, the present application has the following beneficial effects:

[0035] The application provides a control method for high-voltage load working state during automobile fast charging, which can accurately identify whether the automobile meets the fast charging condition by comprehensive judgment based on the current battery allowed discharge power and the power required by all vehicle controllers, effectively avoiding a series of problems that may be caused by blindly fast charging when the battery charging and discharging capacity is limited. At the same time, during the fast charging process, the battery allowed discharge power and the rated discharge power of the DC-DC converter are collected in real time, and whether to send a high-voltage load disable request is judged based on this, to preferentially ensure that the DCDC has enough power to charge the lead-acid storage battery, maintain the normal power supply of all vehicle controllers, avoid the low-voltage power supply situation caused by the continuous consumption of lead-acid storage battery power by all vehicle controllers, improve the reliability of the charging process, and thus effectively improve the use safety and user experience of the vehicle in extreme environments.

[0036] Preferably, in the application, before judging whether the automobile meets the fast charging condition, the actual discharge capacity of the battery at different temperatures can be accurately grasped by collecting the cell temperature in real time and calculating the discharge power using a relationship model, to avoid misjudgment caused by not considering the temperature factor, so as to more reasonably decide whether to fast charge, and improve the accuracy and reliability of the charging decision.

[0037] Preferably, in the application, the battery allowed discharge power is accurately calculated through a preset relationship model of cell temperature and discharge power. The model considers key parameters such as the standard discharge power of the cell at the reference temperature, the current cell temperature, the reference temperature, and the temperature coefficient, and can more accurately reflect the change law of the battery discharge power under different temperature conditions. This enables the automobile control system to quickly and accurately calculate the battery allowed discharge power according to the real-time collected cell temperature in actual application, providing reliable data support for subsequent fast charging condition judgment and high-voltage load control, and enhancing the scientificity and operability of the entire control method.

[0038] Preferably, in the application, by comparing the current battery allowed discharge power with the power required by all vehicle controllers, it can be quickly and intuitively determined whether the battery can provide enough power for fast charging and vehicle controller operation at the same time. If the allowed discharge power is greater than the required power, it indicates that the battery has enough capacity to support fast charging, and the vehicle can safely start the fast charging process; otherwise, fast charging is prohibited, avoiding potential power shortage problems, ensuring the smooth progress of the vehicle charging process, and also protecting the vehicle electrical system from damage caused by power overload or shortage.

[0039] Preferably, in the present application, the working request instruction is issued before determining whether to issue a high-voltage load disable request, and the DCDC is started after receiving the working start instruction; this orderly starting process ensures that the DCDC can work in time and normally during fast charging, providing a stable power supply for charging the lead-acid battery and powering the vehicle controller; helps to avoid charging failure or vehicle electrical system failure caused by abnormal DCDC startup, improves the stability and reliability of the entire fast charging system, and ensures the normal operation of the vehicle during fast charging.

[0040] Preferably, in the present application, by comparing the battery allowable discharge power with the DCDC rated discharge power in real time, the insufficient battery discharge capacity can be found in time. When the battery allowable discharge power is less than the DCDC rated discharge power, a high-voltage load disable request is issued to prioritize the power supply capacity of the DCDC, avoiding excessive consumption of power by high-voltage loads, which prevents the DCDC from providing sufficient power to the lead-acid battery, and further prevents the vehicle controllers from malfunctioning due to insufficient power. This real-time monitoring and dynamic adjustment mechanism effectively improves the rationality and safety of power distribution during fast charging, ensuring the stable operation of the vehicle electrical system.

[0041] Preferably, in the present application, in the case where the high-voltage load has been disabled, the vehicle key power-on signal controls the vehicle large screen to display a high-voltage load disable prompt information, realizing effective information interaction between the vehicle and the user. This function enables the user to understand the working status of the vehicle in time, avoiding confusion or misoperation caused by the sudden stop of some high-voltage loads due to abnormal vehicle functions, such as fast charging. Through the prompt of the vehicle large screen, the user can clearly know the current charging condition of the vehicle and the working status of the high-voltage load, improving the user experience, enhancing the user's trust in the vehicle, and also reflecting the intelligent and humanized design of the vehicle control system. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 A flowchart of a control method for the working state of high-voltage loads during fast charging of a vehicle is provided for the embodiments of the present application;

[0043] Figure 2 A flowchart of a control method for the working state of high-voltage loads during fast charging of a vehicle is provided for the embodiments of the present application;

[0044] Figure 3 A structural schematic diagram of a control system for the working state of high-voltage loads during fast charging of a vehicle is provided for the embodiments of the present application. DETAILED DESCRIPTION

[0045] For further understanding of the present application, the following will make a detailed description of the present application in combination with the accompanying drawings and specific embodiments. It should be understood that the embodiments are only to explain the present application but not to limit it.

[0046] The technical terms related to the present application are explained as follows:

[0047] BMS (Battery Management System): battery management system. In electric vehicles, the BMS controller plays a vital role;

[0048] VCU (Vehicle Control Unit): vehicle control unit;

[0049] IHU (In-Vehicle Head Unit): vehicle control screen. It is an important interface for vehicles and users to interact with information;

[0050] BCM (Body Control Module): vehicle body controller. It is mainly responsible for collecting various state information of the vehicle and interacting with other controllers;

[0051] DCDC (DC-DC Converter): DC-DC converter. In electric vehicles, the main function of DCDC is to convert high-voltage direct current of power battery into low-voltage direct current suitable for vehicle low-voltage system, to charge lead-acid battery and to supply power to vehicle controllers.

[0052] As described in the background, at present, in some extreme environments, such as in extremely cold areas, the vehicle does not identify and judge the battery discharge capability before and during the direct current fast charging after the electric vehicle is parked for a period of time. After the cell temperature is lower than a certain temperature, the charge and discharge capability of the battery will be severely reduced and limited. If the vehicle is in the power-on state for direct current fast charging at this time, the power battery charge and discharge capability may be limited, and the vehicle high-voltage load is always in working state to shunt part of the high-voltage power, resulting in insufficient discharge power of DCDC output to charge the lead-acid battery, and the vehicle controllers are always working to consume the lead-acid battery power, finally resulting in low-voltage feeding problem.

[0053] Embodiment 1

[0054] To solve the above problems, the embodiment provides a control method for high-voltage load working state during automobile fast charging, which can solve the problem that the user fast charges in an extreme environment, the charging and discharging capacity of the battery is limited, the only power battery output of the vehicle high-voltage electrical appliance shunt causes the DCDC to be unable to provide sufficient power for the lead-acid storage battery, and finally the problem of low-voltage power supply is caused by the continuous working of the controllers of the whole vehicle consuming the power of the lead-acid storage battery.

[0055] The control method can monitor the discharging capacity of the power battery in real time, judge whether the vehicle can support normal fast charging, limit the working of other high-voltage loads when the discharging capacity of the power battery is lower than a certain value during the fast charging process, and preferentially guarantee the output power of the DCDC, so as to guarantee the normal power supply of the controllers of the whole vehicle, and remind the user through the vehicle-mounted large screen when the vehicle is in the key power-on state. On the premise of guaranteeing the reliable function of the whole vehicle in an extreme environment, the user can effectively experience the intelligence and humanization of the vehicle, which is particularly important and urgent, and has important significance for promoting the intelligent development of electric vehicles.

[0056] The embodiment provides a control method for high-voltage load working state during automobile fast charging, which comprises the following steps:

[0057] Based on the current battery allowed discharging power and the power required by all controllers of the whole vehicle, it is judged whether the automobile meets the fast charging condition.

[0058] During the fast charging process, based on the real-time collected battery allowed discharging power and the rated discharging power of the DC-DC converter, it is judged whether to send a high-voltage load disabling request.

[0059] The specific implementation process is as follows:

[0060] Step one, fast charging gun battery discharging power calculation and fast charging allowed judgment:

[0061] When the BMS controller receives the DC fast charging gun connection signal sent by the vehicle DC charging port, the current battery allowed discharging power P is calculated according to the minimum cell temperature sent by the cell temperature sensor, and it is judged whether the value is greater than the power p required by all controllers of the whole vehicle; if yes, the vehicle starts DC fast charging, and if no, the IHU is requested to prompt that the battery performance is limited, and the DC fast charging is prohibited.

[0062] Step two, high-voltage load opening condition judgment during fast charging:

[0063] When the condition in the step meets the fast charging start, the VCU controller requests the DCDC to work; and it is judged whether the battery allowed discharging power P in step one is less than the DCDC rated discharging power p'; if yes, other high-voltage loads except the DCDC are requested to be disabled.

[0064] Step three, vehicle state recognition and user reminder:

[0065] When the condition of step two is met, the VCU controller identifies whether the vehicle is in the power-on state according to the key-on signal sent by the BCM controller, and if so, requests the vehicle-mounted large-screen IHU to remind the user of the high-voltage load disable prompt information such as "user battery discharge power is limited, high-voltage load is disabled".

[0066] The control method provided by the embodiment will be further explained in combination with the accompanying drawings:

[0067] As shown in Figure 1 , the embodiment provides a control method for high-voltage load working state during fast charging of an automobile, and the specific implementation process is as follows:

[0068] Battery temperature acquisition and allowed discharge power calculation: the battery temperature sensor acquires the battery temperature and calculates the allowed discharge power of the battery according to the battery temperature.

[0069] Among them, the current allowed discharge power of the battery is calculated based on the current battery temperature and a preset battery temperature and discharge power relationship model; the preset battery temperature and discharge power relationship model is represented as:

[0070]

[0071] In the formula, P represents the allowed discharge power of the battery; P0 represents the standard discharge power of the battery at the reference temperature; T represents the current battery temperature; T0 represents the reference temperature, which is generally selected as a temperature point at which the battery performance is relatively stable, and the common reference temperature is 25℃; k represents the temperature coefficient, which is a dimensionless constant. It reflects the sensitivity of the battery discharge power to temperature change, and its value depends on the chemical system, material properties and other factors of the battery. Different types of batteries have different values. Generally, the larger the value, the greater the amplitude of the discharge power change with temperature; on the contrary, the smaller the value, the weaker the influence of temperature on the discharge power.

[0072] Fast charging condition judgment: after the direct current charging port receives the charging gun connection signal, it is judged whether the allowed discharge power of the battery is greater than the power required for the working of all controllers of the vehicle.

[0073] If not, request the large screen to prompt that the battery performance is limited, and prohibit direct current fast charging.

[0074] If yes, start fast charging.

[0075] Fast charging start and DCDC working request: after confirming that the fast charging starts, request the DCDC to work, and the DCDC starts working.

[0076] High-voltage load disablement determination: During fast charging, determine whether the battery's allowable discharge power is less than the DCDC rated discharge power.

[0077] If not, no additional operations are performed.

[0078] If yes, request that high-voltage loads stop working.

[0079] Vehicle power-on state determination and prompt: The BCM controller obtains the key power-on state and determines whether the vehicle is powered on.

[0080] If not, no additional operations are performed.

[0081] If yes, request that the large screen prompt the discharge power limit and high-voltage load disablement information.

[0082] Embodiment 2

[0083] This embodiment provides a control method for the working state of high-voltage loads during fast charging of an automobile. The control method is specifically applied in the fast charging scenario in extremely cold regions. In extremely cold regions, the outdoor temperature reaches -30°C, and the electric vehicle is left outdoors overnight before preparing for direct current fast charging. The specific implementation process is as follows:

[0084] First, fast charging gun battery discharge power calculation and fast charging permission determination: The user inserts the direct current fast charging gun into the vehicle charging port, and the vehicle direct current charging port sends a connection signal to the BMS controller. The cell temperature sensor detects that the minimum cell temperature is -20°C, and the BMS controller calculates the current battery allowable discharge power P as 30kW based on the pre-set algorithm and the relationship model between cell temperature and discharge power. The power p required for all vehicle controllers to work is calculated as 25kW. Since P (30kW) is greater than p (25kW), the BMS controller controls the vehicle to start direct current fast charging.

[0085] Second, high-voltage load opening condition determination during fast charging: During fast charging, the battery temperature gradually rises, but due to the characteristics of the chemical reaction inside the battery at the initial stage of charging, the battery's allowable discharge power P temporarily drops to 20kW. The DCDC rated discharge power p' is 35kW. At this time, P (20kW) is less than p' (35kW). The VCU controller detects this situation and immediately requests that all high-voltage loads except the DCDC stop working, such as turning off the air conditioning compressor and limiting the power output of the electric power steering system, to ensure that the DCDC has enough power to charge the lead-acid battery.

[0086] Then, vehicle state identification and user prompting: At this time, the vehicle is in the key-on state, and the BCM controller sends this state signal to the VCU. The VCU requests the vehicle-mounted large-screen IHU to display the prompt information “Battery discharge power is limited, part of the high-voltage load has been disabled, please wait patiently during vehicle charging” according to the received signal, to inform the user of the current state of the vehicle, and to avoid user misoperation or anxiety due to abnormality of part of the vehicle functions.

[0087] It can be seen that, by the control method provided in this embodiment, in the low-temperature environment in the extremely cold region, the vehicle successfully avoids the low-voltage feeding problem caused by the limited battery discharge capacity and the high-voltage load shunt. The lead-acid storage battery is sufficiently supplemented, and each controller of the vehicle always maintains a normal working state. The user clearly understands the vehicle condition during charging, and experiences the intelligence and humanization of the vehicle.

[0088] Embodiment 3

[0089] The embodiment provides a control method for the working state of a high-voltage load during fast charging of an automobile. The control method is specifically applied to a fast charging scene in a high-altitude region, and the specific implementation process is as follows:

[0090] Fast charging plug-in gun battery discharge power calculation and fast charging permission judgment: the user inserts a direct current fast charging gun, and the vehicle direct current charging port sends a connection signal to the BMS controller. The cell temperature sensor detects that the minimum temperature of the cell is 35°C, and the BMS controller calculates that the current battery allowable discharge power P is 32kW. The power p required for the working of all controllers of the vehicle is 30kW. Because P (32kW) is greater than p (30kW), the BMS controller controls the vehicle to start direct current fast charging.

[0091] Fast charging high-voltage load opening condition judgment: as the charging continues, the battery temperature continues to rise, and the battery allowable discharge power P drops to 28kW. The DCDC rated discharge power p' is 40kW, and P (28kW) is less than p' (40kW). After detection by the VCU controller, it is requested to disable the working of other high-voltage loads except the DCDC, such as reducing the power of the seat heater in the vehicle and suspending the working of the electric water pump, to ensure the output power of the DCDC.

[0092] Vehicle state identification and user prompting: the vehicle is in the key-on state, and the BCM controller sends this state signal to the VCU. The VCU requests the vehicle-mounted large-screen IHU to display the prompt information “Battery discharge power is limited, part of the high-voltage load has been disabled, part of the function may be limited during charging” to let the user know the state of the vehicle.

[0093] Therefore, in the complex environment of high altitude, the control method of the embodiment effectively guarantees the charging process of the vehicle. The low-voltage feeding problem caused by the decline of the battery discharge capacity and the excessive consumption of high-voltage load is avoided, the normal work of each controller of the vehicle is maintained, and the experience of users using the electric vehicle in special environment is improved.

[0094] Embodiment 4

[0095] As shown in Figure 2 The embodiment provides a control method for high-voltage load working state during automobile fast charging, comprising the following steps:

[0096] A control method for high-voltage load working state during automobile fast charging, comprising:

[0097] Based on the current battery discharge power and the power required for the working of all controllers of the vehicle, it is judged whether the automobile meets the fast charging condition.

[0098] During the fast charging process, based on the real-time collected battery discharge power and the rated discharge power of the DC-DC converter, it is judged whether to send a high-voltage load disable request.

[0099] In the embodiment, before the step of judging whether the automobile meets the fast charging condition based on the current battery discharge power and the power required for the working of all controllers of the vehicle, the method further comprises:

[0100] Based on the received DC charging port connection signal, the current battery cell temperature is collected.

[0101] Based on the current battery cell temperature and the preset relationship model of battery cell temperature and discharge power, the current battery discharge power is calculated.

[0102] In the embodiment, the preset relationship model of battery cell temperature and discharge power is represented as:

[0103]

[0104] In the formula, P represents the battery discharge power, P0 represents the standard discharge power of the battery cell at the reference temperature, T represents the current battery cell temperature, T0 represents the reference temperature, and k represents the temperature coefficient.

[0105] In the embodiment, the step of judging whether the automobile meets the fast charging condition based on the current battery discharge power and the power required for the working of all controllers of the vehicle comprises:

[0106] The current battery discharge power and the power required for the working of all controllers of the vehicle are compared.

[0107] If the current battery allows discharging power is greater than the power required for all vehicle controllers to work, it is judged that the car meets the fast charging condition; otherwise, it is judged that the car does not meet the fast charging condition.

[0108] In addition, before the high-voltage load disabling request is sent based on the real-time collected battery allowed discharging power and the rated discharging power of the DC-DC converter during the fast charging process, the method further comprises:

[0109] When the fast charging starts, a DC-DC converter working request instruction is sent based on the fast charging start signal;

[0110] Based on the received DC-DC converter working start instruction, the DC-DC converter is started.

[0111] In the embodiment, the step of judging whether to send a high-voltage load disabling request based on the real-time collected battery allowed discharging power and the rated discharging power of the DC-DC converter during the fast charging process comprises:

[0112] During the fast charging process, the real-time collected battery allowed discharging power and the rated discharging power of the DC-DC converter are compared in real time;

[0113] If the real-time collected battery allowed discharging power is less than the rated discharging power of the DC-DC converter, a high-voltage load disabling request is sent; otherwise, no response is made.

[0114] In particular, after the step of judging whether to send a high-voltage load disabling request based on the real-time collected battery allowed discharging power and the rated discharging power of the DC-DC converter during the fast charging process, the method further comprises:

[0115] If the high-voltage load has been disabled, a vehicle-mounted large screen is controlled to display a high-voltage load disabling prompt information according to a key-on signal of the car.

[0116] As shown in Figure 3 The embodiment also provides a control system for a high-voltage load working state during car fast charging, which comprises: a first judging module, configured to judge whether a car meets a fast charging condition based on a current battery allowed discharging power and a power required for all vehicle controllers to work; and a second judging module, configured to judge whether to send a high-voltage load disabling request based on a real-time collected battery allowed discharging power and a rated discharging power of a DC-DC converter during a fast charging process.

[0117] The application also provides a device, which comprises a memory configured to store a computer program and a processor configured to execute the computer program to realize the steps of the control method for a high-voltage load working state during car fast charging.

[0118] The processor implements the steps of controlling the working state of the high-voltage load during the automobile fast charging when executing the computer program, for example: judging whether the automobile meets the fast charging condition based on the current battery allowed discharge power and the power required for the working of all controllers of the automobile; and judging whether to send a high-voltage load disabling request based on the real-time collected battery allowed discharge power and the rated discharge power of the DC-DC converter during the fast charging process.

[0119] Alternatively, the processor implements the functions of the modules in the system when executing the computer program, for example: a first judging module for judging whether the automobile meets the fast charging condition based on the current battery allowed discharge power and the power required for the working of all controllers of the automobile; and a second judging module for judging whether to send a high-voltage load disabling request based on the real-time collected battery allowed discharge power and the rated discharge power of the DC-DC converter during the fast charging process.

[0120] Exemplarily, the computer program can be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the present application. The one or more modules / units can be a series of computer program instruction segments capable of completing a preset function, which are used to describe the execution process of the computer program in the automobile high-voltage load working state control device during the automobile fast charging. For example, the computer program can be divided into a first judging module and a second judging module; the specific functions of the modules are as follows: the first judging module is used to judge whether the automobile meets the fast charging condition based on the current battery allowed discharge power and the power required for the working of all controllers of the automobile; and the second judging module is used to judge whether to send a high-voltage load disabling request based on the real-time collected battery allowed discharge power and the rated discharge power of the DC-DC converter during the fast charging process.

[0121] The automobile high-voltage load working state control device can be a desktop computer, a notebook computer, a palm computer, a cloud server and other computing devices. The automobile high-voltage load working state control device can include, but is not limited to, a processor and a memory. Those skilled in the art can understand that the above is an example of the automobile high-voltage load working state control device, and does not constitute a limitation on the automobile high-voltage load working state control device, which can include more components than the above, or combine certain components, or different components, for example, the automobile high-voltage load working state control device can also include an input / output device, a network access device, a bus, etc.

[0122] The processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The processor is the control center of the high-voltage load working state control of the automobile fast charging, and is connected with various parts of the high-voltage load working state control device of the automobile fast charging through various interfaces and lines.

[0123] The memory can be used to store the computer program and / or module, and the processor realizes various functions of the high-voltage load working state control device of the automobile fast charging by running or executing the computer program and / or module stored in the memory, and calling the data stored in the memory.

[0124] The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required by a function (such as a sound playing function, an image playing function, etc.), etc. The data storage area can store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, for example, a hard disk, a memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0125] The application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the steps of the high-voltage load working state control method of the automobile fast charging.

[0126] If the modules / units of the high-voltage load working state control system of the automobile fast charging are realized in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium.

[0127] Based on such understanding, all or part of the processes in the control method of high-voltage load working state during automobile fast charging can be implemented by a computer program instructing relevant hardware, the computer program can be stored in a computer readable storage medium, and the computer program can implement the steps of the control method of high-voltage load working state during automobile fast charging when executed by a processor. The computer program includes computer program codes, which can be in the form of source code, object code, executable files or preset intermediate forms, etc.

[0128] The computer readable storage medium can include any entity or device, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc. that can carry the computer program codes.

[0129] It should be noted that the content contained in the computer readable storage medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, the computer readable storage medium does not include electrical carrier signals and telecommunication signals.

[0130] The present application provides a control method of high-voltage load working state during automobile fast charging, which has the following advantages:

[0131] First, improve the safety and stability of charging: the present application monitors the discharge capacity of the power battery in real time, and reasonably limits the working of high-voltage load in the case of limited battery performance, prioritizes the power supply of DCDC to lead-acid battery, effectively avoids the problem of low-voltage power supply, and ensures that all controllers of the vehicle can always obtain stable power supply during fast charging, thereby improving the safety and stability of the charging process.

[0132] Second, enhance user experience: when the vehicle is in the key-on state, the vehicle's onboard large screen can timely remind the user of the information of limited battery discharge power and high-voltage load disablement, so that the user can clearly understand the working state of the vehicle, avoid confusion and anxiety caused by abnormal vehicle functions, and enhance the user's trust and experience of electric vehicles.

[0133] Third, adapt to complex environments: whether in extremely cold regions or high-altitude and other extreme complex environments, the control method of the present application can accurately control the working state of high-voltage load according to the actual discharge capacity of the battery, so that the electric vehicle can maintain good performance and reliability in different environments, thereby widening the use scenarios of electric vehicles.

[0134] Fourth, promote the intelligent development of electric vehicles: the control method of the application embodies the control concept of the intelligence of electric vehicles, the cooperative work and information interaction between multiple controllers provide technical support for the further expansion and optimization of the intelligent function of electric vehicles, and help to promote the development of the entire electric vehicle industry to the intelligent direction.

[0135] The above embodiment is only one of the implementation manners of the technical scheme of the application, and the protection scope of the application is not limited to the embodiment, but also includes any changes, substitutions and other implementation manners easily thought by those skilled in the art within the technical scope disclosed by the application.

[0136] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the application but not to limit it, although the application has been described in detail with reference to the above examples, those skilled in the art should understand that: the specific implementation of the application can still be modified or replaced, and any modification or equivalent replacement without departing from the spirit and scope of the application should be covered within the protection scope of the claims of the application.

Claims

1. A method for controlling the operating state of a high-voltage load during fast charging of an automobile, characterized in that, include: Based on the current battery discharge power and the power required for all vehicle controllers to operate, determine whether the vehicle meets the fast charging requirements. During fast charging, based on the real-time collected battery allowable discharge power and DC-DC converter rated discharge power, it is determined whether to issue a high-voltage load disable request. The step of determining whether a vehicle meets the fast-charging conditions based on the current battery's allowable discharge power and the power required for all vehicle controllers to operate includes: Compare the current battery's allowable discharge power with the power required for all vehicle controllers to operate; If the current battery's allowable discharge power is greater than the power required for all vehicle controllers to operate, then the vehicle is determined to meet the fast charging conditions; otherwise, the vehicle is determined not to meet the fast charging conditions.

2. The control method for the high-voltage load operating state during fast charging of an automobile according to claim 1, characterized in that, Before determining whether the vehicle meets the fast-charging conditions based on the current battery's allowable discharge power and the power required for all vehicle controllers to operate, the process also includes: The current cell temperature is acquired based on the received DC charging port connection signal; The allowable discharge power of the battery is calculated based on the current cell temperature and a preset model relating cell temperature to discharge power.

3. The control method for the high-voltage load operating state during fast charging of an automobile according to claim 2, characterized in that, The preset relationship model between cell temperature and discharge power is expressed as follows: In the formula, P represents the battery's allowable discharge power; P0 represents the standard discharge power of the cell at the reference temperature; T represents the current cell temperature; T0 represents the reference temperature; and k represents the temperature coefficient.

4. The method for controlling the high-voltage load operating state during fast charging of an automobile according to claim 1, characterized in that, Before determining whether to issue a high-voltage load disable request based on the real-time collected battery allowable discharge power and the rated discharge power of the DC-DC converter during fast charging, the process also includes: When fast charging begins, a DC-DC converter operation request command is issued based on the fast charging start signal; The DC-DC converter is started based on the received DC-DC converter start command.

5. The method for controlling the high-voltage load operating state during fast charging of an automobile according to claim 1, characterized in that, During fast charging, based on real-time collected data on the battery's allowable discharge power and the DC-DC converter's rated discharge power, the system determines whether to issue a high-voltage load disable request, including: During fast charging, the allowable discharge power of the battery, which is collected in real time, is compared with the rated discharge power of the DC-DC converter in real time. If the real-time battery discharge power is less than the rated discharge power of the DC-DC converter, a high-voltage load disable request will be issued; otherwise, no response will be given.

6. The method for controlling the high-voltage load operating state during fast charging of an automobile according to claim 1, characterized in that, During fast charging, after determining whether to issue a high-voltage load disable request based on real-time collected battery allowable discharge power and DC-DC converter rated discharge power, the process further includes: If the high-voltage load is disabled, the in-vehicle screen will display a high-voltage load disabled message based on the power-on signal from the car key.

7. A control system for the high-voltage load operating state during fast charging of an automobile, characterized in that, The steps of the control method for the high-voltage load operating state during fast charging of an automobile as described in any one of claims 1-6 include: The first judgment module is used to determine whether the car meets the fast charging conditions based on the current battery discharge power and the power required for all controllers of the vehicle to work. The second judgment module is used to determine whether to issue a high-voltage load disable request during fast charging based on the real-time collected battery allowable discharge power and DC-DC converter rated discharge power.

8. A device, characterized in that, include: Memory, used to store computer programs; A processor, configured to execute the computer program to implement the steps of the control method for the high-voltage load operating state during fast charging of an automobile as described in any one of claims 1-6.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it is used to implement the steps of the control method for the high-voltage load working state during fast charging of an automobile as described in any one of claims 1-6.

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