Method for determining charging voltage of low-voltage storage battery of vehicle and related equipment

Abstract

The embodiment of the invention relates to the field of automobiles, in particular to a vehicle low-voltage storage battery charging voltage determining method and related equipment. The battery charging voltage determining method is characterized by comprising the following steps: acquiring the residual electric quantity of a power battery, the residual electric quantity of a low-voltage storage battery and an environment temperature; if the residual electric quantity of the low-voltage storage battery is not obtained, the charging voltage of the low-voltage storage battery is determined according to the environment temperature; and if the residual electric quantity of the low-voltage storage battery is obtained, determining the charging voltage of the low-voltage storage battery based on the residual electric quantity of the power battery, the residual electric quantity of the low-voltage storage battery and the environment temperature.

Description

Technical Field

[0001] The embodiments of the present invention relate to the automotive field, and in particular to a method for determining the charging voltage of a low-voltage battery of a vehicle and related equipment. Background Art

[0002] In the low-voltage system of current new energy electric vehicles or hybrid electric vehicles, the DC conversion module (DCDC module) charges the low-voltage battery. Under different vehicle operating conditions, the charging strategy for the low-voltage battery is also different. For example, the vehicle load is divided into multiple parts, and the output power of the DCDC is determined according to the start-up status of the on-board electrical appliances by connecting in parallel or in series with the DC conversion module or the low-voltage battery, thereby supplying power to the low-voltage part of the vehicle. The disadvantage of this method is that the vehicle wiring harness needs to be modified so that the components are connected in series or in parallel. In addition, the wiring harness further reduces the circuit voltage. Summary of the invention

[0003] In view of this, the present application provides a method for determining the charging voltage of a vehicle's low-voltage battery and related equipment, which can determine the charging voltage of the low-voltage battery based on the specific state of the vehicle, thereby reducing the energy consumption of the entire vehicle and improving the user's driving experience.

[0004] In a first aspect, an embodiment of the present invention provides a method for determining a charging voltage of a low-voltage battery of a vehicle, comprising:

[0005] Obtain the remaining power of the power battery, the remaining power of the low-voltage battery and the ambient temperature;

[0006] If the remaining power of the low-voltage battery is not obtained, determining the charging voltage of the low-voltage battery according to the ambient temperature;

[0007] If the remaining power of the low-voltage battery is obtained, the charging voltage of the low-voltage battery is determined based on the remaining power of the power battery, the remaining power of the low-voltage battery and the ambient temperature.

[0008] In a possible implementation, determining the charging voltage of the low-voltage battery according to the ambient temperature includes:

[0009] If the ambient temperature is less than a first threshold, determining a first preset voltage as a charging voltage of the low-voltage battery;

[0010] If the ambient temperature is greater than a second threshold, the second preset voltage is determined as the charging voltage of the low-voltage battery; wherein the second threshold is greater than the first threshold;

[0011] If the ambient temperature is greater than or equal to the first threshold, and the ambient temperature is less than or equal to the second threshold, determining a third preset voltage as the charging voltage of the low-voltage battery;

[0012] The first preset voltage is greater than the third preset voltage, and the third preset voltage is greater than the second preset voltage.

[0013] In a possible implementation, determining the charging voltage of the low-voltage battery based on the remaining power of the power battery, the remaining power of the low-voltage battery, and the ambient temperature includes:

[0014] Determining whether the remaining power of the power battery is less than or equal to a third threshold;

[0015] If the remaining power of the power battery is less than or equal to the third threshold, determining a first candidate voltage value according to the remaining power of the low-voltage battery and the ambient temperature;

[0016] A charging voltage of the low-voltage battery is determined based on the first candidate voltage value.

[0017] In a possible implementation, if the remaining power of the power battery is greater than the third threshold, the method includes:

[0018] Get the status information of the energy recovery function;

[0019] If the state information of the energy recovery function is an on state, the first preset voltage is determined as the first candidate voltage value; if the state information of the energy recovery function is an off state, the first candidate voltage value is determined according to the remaining power of the low-voltage battery and the ambient temperature;

[0020] A charging voltage of the low-voltage battery is determined based on the first candidate voltage value.

[0021] In a possible implementation, determining the charging voltage of the low-voltage battery based on the first candidate voltage value includes:

[0022] Obtain the output voltage of the low voltage DC converter;

[0023] Determining whether the output voltage of the low-voltage DC converter is less than a fourth threshold;

[0024] If the output voltage of the low-voltage DC converter is less than the fourth threshold, a compensation value of the first candidate voltage value is determined based on the resistance value of the longest line from the low-voltage DC converter to the electrical appliance; wherein, if the output voltage of the low-voltage DC converter is greater than or equal to the fourth threshold, the compensation value is 0;

[0025] compensating the first candidate voltage value based on the compensation value;

[0026] A charging voltage of the low-voltage battery is determined based on the compensated first candidate voltage value.

[0027] In a possible implementation, determining the charging voltage of the low-voltage battery based on the compensated first candidate voltage value includes:

[0028] Taking the minimum value of the compensated first candidate voltage value and the first preset voltage to obtain a second candidate voltage value;

[0029] A charging voltage of the low-voltage battery is determined based on the second candidate voltage value.

[0030] In a possible implementation, determining the charging voltage of the low-voltage battery based on the second candidate voltage value includes:

[0031] Acquire the working state of the engine; the working state of the engine includes started or not started;

[0032] determining a third candidate voltage value according to the working state of the engine;

[0033] The maximum value of the second candidate voltage value and the third candidate voltage value is taken to obtain the charging voltage of the low-voltage battery.

[0034] In a second aspect, an embodiment of the present invention provides a device for determining a charging voltage of a low-voltage battery of a vehicle, comprising:

[0035] An acquisition module is used to acquire the remaining power of the power battery, the remaining power of the low-voltage battery and the ambient temperature;

[0036] a processing module, configured to determine a charging voltage of the low-voltage battery according to the ambient temperature when the acquisition module fails to acquire the remaining power of the low-voltage battery;

[0037] The processing module is further used to determine the charging voltage of the low-voltage battery based on the remaining power of the power battery, the remaining power of the low-voltage battery and the ambient temperature when the remaining power of the low-voltage battery is obtained.

[0038] In a third aspect, an embodiment of the present invention provides an electronic device, including:

[0039] at least one processor; and

[0040] at least one memory in communication with the processor, wherein:

[0041] The memory stores program instructions executable by the processor, and the processor calls the program instructions to execute the method described in the first aspect.

[0042] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions enable the computer to execute the method described in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0044] Figure 1 A flow chart of a method for determining the charging voltage of a low-voltage battery of a vehicle provided by an embodiment of the present invention;

[0045] Figure 2 A schematic diagram of the structure of a device for determining the charging voltage of a low-voltage battery of a vehicle provided by an embodiment of the present invention;

[0046] Figure 3 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0048] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0049] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0050] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0051] In order to reduce the energy consumption of the whole vehicle, an embodiment of the present invention provides a method for determining the charging voltage of a low-voltage battery of a vehicle and related equipment, which determines the charging voltage of the low-voltage battery based on the actual state of the vehicle. Figure 1 The present invention provides a flow chart of a method for determining the charging voltage of a low-voltage battery in a vehicle. Figure 1 As shown in , the method includes:

[0052] Step 101, obtaining the remaining power of the power battery, the remaining power of the low-voltage battery and the ambient temperature.

[0053] Among them, the vehicle control unit (VCU) can make the vehicle enter the high-voltage power-on state through the high-voltage power-on process. When the vehicle enters the high-voltage power-on state, the power battery is connected to the vehicle power supply circuit, and the remaining power of the power battery can be obtained at this time. For the ambient temperature, it can be obtained through the corresponding temperature sensor. For the remaining power of the low-voltage battery, it can be obtained through the intelligent battery sensor (Intelligent Battery Sensor, IBS). If the remaining power of the low-voltage battery is not obtained, execute step 102. If the remaining power of the low-voltage battery is obtained, execute step 103.

[0054] Step 102, determining the charging voltage of the low-voltage battery according to the ambient temperature.

[0055] For scenarios where the IBS fails and the remaining power of the low-voltage battery cannot be obtained, and scenarios where the vehicle is not equipped with an IBS and the remaining power of the low-voltage battery cannot be obtained, the charging voltage of the low-voltage battery can be determined according to the ambient temperature. When the ambient temperature is low, the normal operating voltage of each load device under the low-voltage system needs to be increased. Therefore, the lower the ambient temperature, the higher the charging voltage of the low-voltage battery. The higher the ambient temperature, the lower the charging voltage of the low-voltage battery. Specifically, the correlation between different ambient temperatures and different charging voltages can be established in advance, and then the corresponding charging voltage can be determined according to the obtained ambient temperature.

[0056] In some embodiments, in order to reduce the processing pressure of calculating the charging voltage of the low-voltage battery according to the ambient temperature, a threshold value can be set for the ambient temperature to determine the charging voltage of the low-voltage battery. Specifically, when the ambient temperature is less than a first threshold value, a first preset voltage is determined as the charging voltage of the low-voltage battery. The first preset voltage is the maximum value of the charging voltage of the low-voltage battery.

[0057] If the ambient temperature is greater than the second threshold, the second preset voltage is determined as the charging voltage of the low-voltage battery, wherein the second threshold is greater than the first threshold, and wherein the second preset voltage is the minimum value of the charging voltage of the low-voltage battery.

[0058] If the ambient temperature is greater than or equal to the first threshold, and the ambient temperature is less than or equal to the second threshold, the third preset voltage is determined as the charging voltage of the low-voltage battery, wherein the first preset voltage is greater than the third preset voltage, and the third preset voltage is greater than the second preset voltage.

[0059] For example, the first threshold is 10°C, and the second threshold is 25°C. The first preset voltage is 14.5V, the second preset voltage is 14V, and the third preset voltage is 14.3V. When the ambient temperature is less than 10°C, the charging voltage is the first preset voltage of 14.5V. When the ambient temperature is ≥10°C and ≤25°C, the charging voltage is the third preset voltage of 14.3V. When the ambient temperature is >25°C, the charging voltage is the second preset voltage of 14V.

[0060] Step 103 : determining the charging voltage of the low-voltage battery based on the remaining power of the power battery, the remaining power of the low-voltage battery, and the ambient temperature.

[0061] When the vehicle is equipped with an IBS and the IBS is not faulty, the remaining power of the low-voltage battery can be obtained through the IBS. Therefore, it is possible to first determine whether the remaining power of the power battery is less than or equal to the third threshold. If the remaining power of the power battery is less than or equal to the third threshold. Then, by looking up a table, determine the first candidate voltage value according to the remaining power of the low-voltage battery and the ambient temperature. Then, determine the charging voltage of the low-voltage battery based on the first candidate voltage value. Table 1-1 is a first candidate voltage value correspondence table provided in an embodiment of the present invention. As shown in Table 1-1, the first candidate voltage values ​​corresponding to different ambient temperatures and different remaining powers of the low-voltage battery are different. Based on Table 1-1 and the acquired ambient temperature and the remaining power of the low-voltage battery, the corresponding first candidate voltage value can be obtained.

[0062] For example, the third threshold is 90%, the current ambient temperature is 0°C, and the remaining power of the low-voltage battery is 60%. When the remaining power of the power battery is less than or equal to 90%, the first candidate voltage value can be obtained from Table 1-1 as 14.5V, so the first candidate voltage value 14.5V can be used as the charging voltage of the low-voltage battery.

[0063] In some embodiments, when the remaining power of the power battery is greater than the third threshold, it is necessary to determine the charging voltage of the low-voltage battery according to the state of the energy recovery function. Specifically, first obtain the state information of the energy recovery function. The energy recovery function captures the energy generated by the vehicle during braking, downhill or coasting, converts it into electrical energy and stores it, thereby improving the overall energy utilization efficiency and extending the cruising range of the electric vehicle. When the remaining power of the power battery is high, the recovery efficiency of the energy recovery function is weak. When the state information of the energy recovery function is turned on, the first preset voltage can be determined as the first candidate voltage value. If the state information of the energy recovery function is turned off, the above-mentioned table lookup method is used to determine the first candidate voltage value according to the remaining power of the low-voltage battery and the ambient temperature. Finally, the charging voltage of the low-voltage battery is determined based on the obtained first candidate voltage value.

[0064] In some embodiments, it is also necessary to consider the impact of the circuit voltage drop of the low-voltage circuit of the whole vehicle on the circuit. Since the low-voltage battery is powered by a low-voltage DC converter (i.e., a DCDC module), the output voltage of the low-voltage DC converter can be obtained first. Then, it is determined whether the output voltage of the low-voltage DC converter is less than the fourth threshold. If the output voltage of the low-voltage DC converter is less than the fourth threshold, it means that the output voltage of the low-voltage DC converter is low, and the impact of the circuit voltage drop on the charging of the low-voltage battery needs to be considered. Therefore, the compensation value of the first candidate voltage value is determined based on the resistance value of the longest line from the low-voltage DC converter to the electrical appliance. Among them, the longest line refers to the line between the electrical appliance farthest from the low-voltage DC converter and the low-voltage DC converter that is currently working in the low-voltage circuit.

[0065] The compensation value is the circuit voltage drop, which can be obtained by the current value output by the low-voltage DC converter and the resistance value of the longest line. In some embodiments, if the output voltage of the low-voltage DC converter is greater than or equal to the fourth threshold, the influence of the circuit voltage drop does not need to be considered, and the compensation value is 0.

[0066] Afterwards, the first candidate voltage value is compensated based on the compensation value, and the charging voltage of the low-voltage battery is determined based on the compensated first candidate voltage value. Optionally, the first candidate voltage value can be compared with the first preset voltage, the minimum value of the two can be taken, and the obtained minimum value is used as the second candidate voltage value, and finally the charging voltage of the low-voltage battery is determined based on the second candidate voltage value. This operation can prevent the compensated first preset voltage from being greater than the maximum charging voltage of the low-voltage battery (i.e., the first preset voltage), thereby protecting the low-voltage battery from charging and increasing the service life of the low-voltage battery.

[0067] In some embodiments, when determining the charging voltage of the low-voltage battery, the working state of the engine also needs to be considered. Specifically, the working state of the engine can be first obtained through the vehicle bus (CAN bus or K bus). The working state of the engine includes started or not started. Afterwards, the third candidate voltage value is determined according to the working state of the engine. When the working state of the engine is started, the third candidate voltage value is the minimum operating voltage of the engine. When the working state of the engine is not started, the third candidate voltage value is the lowest charging voltage. Afterwards, the maximum value of the second candidate voltage value and the third candidate voltage value is taken to obtain the charging voltage of the low-voltage battery.

[0068] In the embodiment of the present invention, the failure and normal working conditions of IBS are taken into consideration, and the vehicle models without IBS can be directly covered, so as to achieve the platformization of the strategy. It takes into account the high SOC recovery of the power battery and the engine start-up to ensure the normal operation of all engine components. The voltage compensation method is used to ensure that the whole vehicle will not affect the normal operation of remote electrical appliances due to the large voltage drop generated when the high current is working.

[0069] Corresponding to the above-mentioned method for determining the charging voltage of a low-voltage battery of a vehicle, an embodiment of the present invention provides a device for determining the charging voltage of a low-voltage battery of a vehicle. Figure 2 The present invention provides a schematic diagram of a device for determining the charging voltage of a low-voltage battery in a vehicle according to an embodiment of the present invention. Figure 2 As shown in , the device includes: an acquisition module 201 and a processing module 202.

[0070] The acquisition module 201 is used to acquire the remaining power of the power battery, the remaining power of the low-voltage battery and the ambient temperature.

[0071] The processing module 202 is used to determine the charging voltage of the low-voltage battery according to the ambient temperature when the acquisition module fails to acquire the remaining power of the low-voltage battery.

[0072] The processing module 202 is further configured to determine the charging voltage of the low-voltage battery based on the remaining power of the power battery, the remaining power of the low-voltage battery and the ambient temperature when the remaining power of the low-voltage battery is acquired.

[0073] Figure 2 The vehicle low-voltage battery charging voltage determination device provided by the illustrated embodiment can be used to perform Figure 1 The technical solution of the method embodiment shown, its implementation principle and technical effects can be further referred to the relevant description in the method embodiment.

[0074] Figure 3 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention is shown in FIG. Figure 3As shown, the electronic device may include at least one processor and at least one memory in communication with the processor, wherein the memory stores program instructions executable by the processor, and the processor calls the program instructions to execute the instructions of this specification. Figure 1 The illustrated embodiment provides a method for determining the charging voltage of a low-voltage battery of a vehicle.

[0075] like Figure 3 As shown, the electronic device is in the form of a general computing device. The components of the electronic device may include but are not limited to: one or more processors 310, communication interface 320 and memory 330, and a communication bus 340 connecting different system components (including memory 330, communication interface 320 and processor 310).

[0076] The communication bus 340 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processor or a local bus using any of a variety of bus structures. For example, these architectures include but are not limited to Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus and Peripheral Component Interconnection (PCI) bus.

[0077] Electronic devices typically include a variety of computer system readable media. These media can be any available media that can be accessed by the electronic device, including volatile and non-volatile media, removable and non-removable media.

[0078] The memory 330 may include a computer system readable medium in the form of a volatile memory, such as a random access memory (RAM) and / or a cache memory. The electronic device may further include other removable / non-removable, volatile / non-volatile computer system storage media. The memory 330 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of each embodiment of the present specification.

[0079] A program / utility having a set (at least one) of program modules may be stored in memory 330, such program modules including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment. The program modules generally perform the functions and / or methods of the embodiments described in this specification.

[0080] The processor 310 executes various functional applications and data processing by running the programs stored in the memory 330, such as implementing the Figure 1 The illustrated embodiment provides a method for determining the charging voltage of a low-voltage battery of a vehicle.

[0081] The embodiment of the present specification provides a computer program product, the computer program product includes a computer program, when the computer program is executed by a processor, implements the execution of the present specification Figure 1 The illustrated embodiment provides a method for determining the charging voltage of a low-voltage battery of a vehicle.

[0082] The embodiment of the present specification provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, wherein the computer instructions enable the computer to execute the present specification. Figure 1 The illustrated embodiment provides a method for determining the charging voltage of a low-voltage battery of a vehicle.

[0083] The above-mentioned computer-readable storage medium can adopt any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, - but not limited to - an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ReadOnly Memory; hereinafter referred to as: ROM), an erasable programmable read-only memory (Erasable Programmable ReadOnly Memory; hereinafter referred to as: EPROM) or flash memory, optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, a computer-readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.

[0084] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0085] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this specification. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0086] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this specification, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0087] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of this specification includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of this specification belong.

[0088] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0089] It should be noted that the devices involved in the embodiments of this specification may include but are not limited to personal computers (Personal Computer; hereinafter referred to as: PC), personal digital assistants (Personal Digital Assistant; hereinafter referred to as: PDA), wireless handheld devices, tablet computers (Tablet Computer), mobile phones, MP3 displays, MP4 displays, etc.

[0090] In the several embodiments provided in this specification, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0091] In addition, each functional unit in each embodiment of this specification may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0092] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a connector, or a network device, etc.) or a processor (Processor) to perform some steps of the method described in each embodiment of this specification. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory; hereinafter referred to as: ROM), random access memory (Random Access Memory; hereinafter referred to as: RAM), disk or optical disk and other media that can store program codes.

[0093] The above description is only a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this specification should be included in the scope of protection of this specification.

[0094] In this specification, the same or similar parts between the various embodiments can be referred to each other. In particular, for the device embodiment and the terminal embodiment, since they are basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description in the method embodiment.

Claims

1. A method for determining the charging voltage of a vehicle low-voltage battery, characterized in that: include: Obtain the remaining power of the power battery, the remaining power of the low-voltage battery and the ambient temperature; If the remaining power of the low-voltage battery is not obtained, determining the charging voltage of the low-voltage battery according to the ambient temperature; If the remaining power of the low-voltage battery is obtained, the charging voltage of the low-voltage battery is determined based on the remaining power of the power battery, the remaining power of the low-voltage battery and the ambient temperature.

2. The method according to claim 1, characterized in that: Determining the charging voltage of the low-voltage battery according to the ambient temperature includes: If the ambient temperature is less than a first threshold, determining a first preset voltage as a charging voltage of the low-voltage battery; If the ambient temperature is greater than a second threshold, the second preset voltage is determined as the charging voltage of the low-voltage battery; wherein the second threshold is greater than the first threshold; If the ambient temperature is greater than or equal to the first threshold, and the ambient temperature is less than or equal to the second threshold, determining a third preset voltage as the charging voltage of the low-voltage battery; The first preset voltage is greater than the third preset voltage, and the third preset voltage is greater than the second preset voltage.

3. The method according to claim 1, characterized in that Determining the charging voltage of the low-voltage battery based on the remaining power of the power battery, the remaining power of the low-voltage battery, and the ambient temperature includes: Determining whether the remaining power of the power battery is less than or equal to a third threshold; If the remaining power of the power battery is less than or equal to the third threshold, determining a first candidate voltage value according to the remaining power of the low-voltage battery and the ambient temperature; A charging voltage of the low-voltage battery is determined based on the first candidate voltage value.

4. The method according to claim 3, characterized in that If the remaining power of the power battery is greater than the third threshold, the method includes: Get the status information of the energy recovery function; If the state information of the energy recovery function is an on state, the first preset voltage is determined as the first candidate voltage value; if the state information of the energy recovery function is an off state, the first candidate voltage value is determined according to the remaining power of the low-voltage battery and the ambient temperature; A charging voltage of the low-voltage battery is determined based on the first candidate voltage value.

5. The method according to claim 4, characterized in that The step of determining the charging voltage of the low-voltage battery based on the first candidate voltage value includes: Obtain the output voltage of the low voltage DC converter; Determining whether the output voltage of the low-voltage DC converter is less than a fourth threshold; If the output voltage of the low-voltage DC converter is less than the fourth threshold, a compensation value of the first candidate voltage value is determined based on the resistance value of the longest line from the low-voltage DC converter to the electrical appliance; wherein, if the output voltage of the low-voltage DC converter is greater than or equal to the fourth threshold, the compensation value is 0; compensating the first candidate voltage value based on the compensation value; A charging voltage of the low-voltage battery is determined based on the compensated first candidate voltage value.

6. The method according to claim 5, characterized in that Determining a charging voltage of the low-voltage battery based on the compensated first candidate voltage value includes: Taking the minimum value of the compensated first candidate voltage value and the first preset voltage to obtain a second candidate voltage value; A charging voltage of the low-voltage battery is determined based on the second candidate voltage value.

7. The method according to claim 6, characterized in that The step of determining the charging voltage of the low-voltage battery based on the second candidate voltage value includes: Acquire the working state of the engine; the working state of the engine includes started or not started; determining a third candidate voltage value according to the operating state of the engine; The maximum value of the second candidate voltage value and the third candidate voltage value is taken to obtain the charging voltage of the low-voltage battery.

8. A device for determining the charging voltage of a low-voltage battery of a vehicle, characterized in that: include: An acquisition module is used to acquire the remaining power of the power battery, the remaining power of the low-voltage battery and the ambient temperature; a processing module, configured to determine a charging voltage of the low-voltage battery according to the ambient temperature when the acquisition module fails to acquire the remaining power of the low-voltage battery; The processing module is further used to determine the charging voltage of the low-voltage battery based on the remaining power of the power battery, the remaining power of the low-voltage battery and the ambient temperature when the remaining power of the low-voltage battery is obtained.

9. An electronic device, characterized in that: include: at least one processor; as well as at least one memory in communication with the processor, wherein: The memory stores program instructions executable by the processor, and the processor can execute the method according to any one of claims 1 to 7 by calling the program instructions.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions enable the computer to execute the method according to any one of claims 1 to 7.

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