Vehicle charging current regulation method, vehicle controller and vehicle

Abstract

The application provides a vehicle charging current adjusting method, a vehicle controller and a vehicle. According to the charging working condition of the vehicle determined according to the acquired demand charging current and charging performance data, if it is determined that the charging demand of the vehicle is greater than or equal to the charging capacity of the charging pile according to the charging working condition, the target charging current of the vehicle is adjusted according to the demand charging current and the charging performance data, so that the target charging current is lower than the charging current corresponding to the charging capacity, the maximum performance of the charging pile can be exerted as much as possible, the continuity of charging can be ensured, the charging efficiency can be improved, and the charging time can be shortened.

Description

Technical Field

[0001] This invention relates to the field of vehicle electronics technology, specifically to a method for regulating vehicle charging current, a vehicle controller, and a vehicle. Background Technology

[0002] When charging a pure electric vehicle, the vehicle requires a relatively high charging power. If this power is greater than or equal to the charging power of the charging station, the charging station will typically charge the vehicle's battery at its maximum output power. However, charging at maximum output power already reaches the upper limit of the charging station's hardware capacity. If any fluctuation occurs during the charging process that causes the charging station to exceed this limit, the charging station will automatically terminate the charging process as a self-protection mechanism, resulting in an interruption in the charging process and leading to customer complaints.

[0003] Therefore, ensuring the stability of the vehicle charging process in order to improve charging efficiency is an urgent problem that needs to be solved. Summary of the Invention

[0004] In view of this, the present invention aims to provide a vehicle charging current adjustment method, device, vehicle controller and vehicle. By adjusting the vehicle charging current to be lower than the charging current corresponding to the charging capacity of the charging pile, the charging pile can be maximized while ensuring continuous charging, thereby improving charging efficiency and shortening charging time.

[0005] To achieve the above technical objectives, the embodiments of this specification provide the following technical solutions:

[0006] In a first aspect, embodiments of this application provide a method for adjusting vehicle charging current. The method includes: acquiring the vehicle's required charging current and the charging performance data of the charging pile; determining the vehicle's charging condition based on the required charging current and the charging performance data; if the charging condition indicates that the vehicle's charging demand is greater than or equal to the charging capacity of the charging pile, then adjusting the vehicle's target charging current based on the required charging current and the charging performance data so that the target charging current is lower than the charging current corresponding to the charging capacity.

[0007] Optionally, the charging performance data includes at least the maximum output current and maximum output power of the charging pile; determining the vehicle's charging condition based on the required charging current and charging performance data includes: calculating the product of the required charging current and the required charging voltage to obtain the vehicle's required charging power, where the required charging voltage is the current voltage of the battery in the vehicle; determining the vehicle's charging condition based on the relationship between the required charging current and the maximum output current, and / or the relationship between the required charging power and the maximum output power.

[0008] Optionally, the vehicle charging condition determined based on the relationship between the required charging current and the maximum output current, and / or the relationship between the required charging power and the maximum output power, includes: if the required charging current is less than the maximum output current, the vehicle is determined to be in a first charging condition, where the first charging condition indicates that the vehicle's charging demand is less than the charging capacity of the charging pile; if the required charging current is greater than or equal to the maximum output current, and the required charging power is less than a reference output power, the vehicle is determined to be in a second charging condition, where the second charging condition indicates that the vehicle's charging demand is close to the charging capacity of the charging pile, and the reference output power is the difference between the maximum output power and a preset redundant output power; if the required charging current is greater than or equal to the maximum output current, and the required charging power is greater than or equal to the maximum output power, the vehicle is determined to be in a third charging condition, where the third charging condition indicates that the vehicle's charging demand is greater than or equal to the charging capacity of the charging pile.

[0009] Optionally, adjusting the target charging current of the vehicle based on the required charging current and the charging performance data includes: calculating a first charging current based on the required charging current and the charging performance data; determining a first reserved charging current based on the required charging power, the charging performance data, and the ambient temperature; and calculating the difference between the first charging current and the first reserved charging current to obtain the target charging current.

[0010] Optionally, the charging performance data further includes the maximum allowable charging current; the step of calculating the first charging current based on the required charging current and the charging performance data includes: selecting the minimum value among the required charging current, the maximum allowable charging current, and the maximum output current to obtain the second charging current; calculating the ratio of the maximum output power to the required charging voltage, and selecting the minimum value of the second charging current and the ratio to obtain the first charging current.

[0011] Optionally, the charging performance data further includes the peak value of the output current fluctuation; obtaining the first reserved charging current based on the required charging power, the charging performance data, and the ambient temperature includes: calculating the difference between the required charging power and the maximum output power of the charging pile to obtain the difference power; finding a preset first mapping relationship based on the difference power and the peak value of the output current fluctuation to obtain the second reserved charging current, wherein the first mapping relationship records the correspondence between the difference power, the peak value of the output current fluctuation, and the second reserved charging current; and obtaining the first reserved charging current based on the second reserved charging current and the ambient temperature.

[0012] Optionally, obtaining the first reserved charging current based on the second reserved charging current and the ambient temperature includes: obtaining an ambient temperature factor based on the ambient temperature according to a preset second mapping relationship, wherein the second mapping relationship records the correspondence between the ambient temperature and the ambient temperature factor; and obtaining the product of the second reserved charging current and the ambient temperature factor to obtain the first reserved charging current.

[0013] Optionally, obtaining the required charging current of the vehicle includes: obtaining the current required charging current of the battery in the vehicle; detecting the actual current consumed by a target load in the vehicle, the target load including a compressor, an electric heater, a voltage converter, and a motor; and calculating the sum of the current required charging current and the actual current consumed by the target load to obtain the required charging current of the vehicle.

[0014] Secondly, embodiments of this application also provide a vehicle charging current adjustment device applied to a vehicle controller. The device includes: a data acquisition module for acquiring the vehicle's required charging current and the charging performance data of the charging pile; a working condition determination module for determining the vehicle's charging working condition based on the required charging current and the charging performance data; and a current adjustment module for adjusting the vehicle's target charging current based on the required charging current and the charging performance data if the charging working condition indicates that the vehicle's charging demand is greater than or equal to the charging capacity of the charging pile, so that the target charging current is lower than the charging current corresponding to the charging capacity.

[0015] Thirdly, embodiments of this application also provide a vehicle controller, including: a memory for storing executable program code; and a processor for calling and running the executable program code from the memory, so that the vehicle controller performs the aforementioned method.

[0016] Fourthly, one embodiment of this specification also provides a vehicle, the vehicle including: a charging interface, a battery connected to the charging interface, a battery management system and the aforementioned vehicle controller, wherein the battery management system is connected to the battery, and the vehicle controller is also connected to the battery management system.

[0017] As can be seen from the above technical solutions, the vehicle charging current adjustment method provided in this specification determines the vehicle's charging conditions based on the acquired demand charging current and charging performance data. When the electricity demand is greater than or equal to the charging capacity of the charging pile, the target charging current of the vehicle is calculated based on the demand charging current and charging performance data. This can maximize the performance of the charging pile. Since the target charging current is lower than the charging current corresponding to the charging capacity, the charging continuity can be guaranteed, thereby improving charging efficiency and shortening charging time.

[0018] The above description is merely an overview of the technical solution disclosed herein. In order to better understand the technical means of this disclosure and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this disclosure more apparent and understandable, specific embodiments of this disclosure are described below. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0020] Figure 1 The diagram shown is a schematic representation of a system framework provided in an embodiment of this application.

[0021] Figure 2 The diagram shown is a flowchart illustrating a vehicle charging current adjustment method according to an embodiment of this application.

[0022] Figure 3 The diagram shown is a calculation schematic of a second charging current provided in one embodiment of this application;

[0023] Figure 4 The diagram shown is a schematic diagram of obtaining a first reserved charging current according to an embodiment of this application;

[0024] Figure 5 The diagram shown is a structural schematic of a vehicle charging current regulating device according to an embodiment of this application;

[0025] Figure 6 The diagram shown is a structural schematic of a vehicle controller provided in one embodiment of this application. Detailed Implementation

[0026] Unless otherwise defined, the technical or scientific terms used in the embodiments of this specification shall have the ordinary meaning understood by one of ordinary skill in the art to which this specification pertains. The terms "first," "second," and similar terms used in the embodiments of this specification do not indicate any order, quantity, or importance, but are merely used to avoid confusion of constituent elements.

[0027] Unless the context otherwise requires, throughout this specification, "a plurality of" means "at least two," and "including" is interpreted as open-ended or encompassing, that is, "including, but not limited to." In the description of this specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this specification. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example.

[0028] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0029] This application provides a system framework, such as Figure 1 As shown, the system mainly includes: a vehicle and a charging station. The vehicle is connected to the charging station, with the specific charging socket connected to the vehicle's charger adapter. The vehicle's charging interface is connected to the charging gun, which is connected to the charging station via a charging cable. The charging gun is a device used to provide power to the electric vehicle; its main function is to connect the electric vehicle to the charging equipment, enabling power to be effectively transferred from the charging equipment to the electric vehicle's battery.

[0030] The vehicle in this application is preferably a pure electric vehicle. The vehicle includes: a charging interface, a battery connected to the charging interface, a Battery Management System (BMS), and a vehicle controller. The BMS is connected to the battery, and the vehicle controller is also connected to the BMS. The charging interface is the connection interface between the vehicle and the charging station, conforming to specific national or international standards to ensure compatibility between electric vehicles of different brands and models and the charging station. The charging interface not only provides electrical connection but also enables data communication during the charging process through internal signal lines, such as adjusting vehicle battery charging requirements, charging voltage, and charging current. The vehicle's BMS is a crucial system in electric vehicles used to monitor, protect, and control the battery pack. It monitors parameters such as voltage, current, and temperature of the battery pack in real time, ensuring the battery operates within safe ranges, preventing overcharging, over-discharging, short circuits, and other abnormal conditions, thus guaranteeing the safety and performance of the battery pack. Based on the actual condition of the battery and the vehicle's needs, it intelligently adjusts the battery charging and discharging process to improve battery efficiency and lifespan. The battery is one of the core components of new energy vehicles, used to store and provide electrical energy to drive the vehicle.

[0031] The vehicle control unit (VCU) in the vehicle acquires the required charging current and receives charging performance data from the charging station. It then determines the vehicle's charging conditions based on the required charging current and the charging performance data. The VCU further adjusts the target charging current according to each charging condition, based on the required charging current and the charging performance data.

[0032] In related technologies, charging pure electric vehicles generally involves constant current charging followed by constant voltage charging. During the constant current charging phase, the voltage and current are constant, and the voltage rises relatively quickly. In this phase, if the vehicle's charging power demand is high, greater than or equal to the charging station's power, the charging station typically charges the vehicle's battery at its maximum output power to maximize charging efficiency. However, charging at maximum output power indicates that the charging station has reached its hardware capacity limit. At this point, any fluctuations during charging can easily cause the charging station to exceed this limit. Once the charging station exceeds this limit, it will automatically terminate the charging process as a self-protection mechanism, resulting in an interruption in the charging process.

[0033] Based on the above system, in order to solve the technical problem that the charging pile terminates the charging process as a self-protection mechanism due to charging at maximum output power, this application provides a vehicle charging current adjustment method, such as... Figure 2 As shown, Figure 2 This is a schematic flowchart illustrating a vehicle charging current adjustment method provided in an embodiment of this application. This vehicle charging current adjustment method can be applied to a vehicle controller and includes:

[0034] Step S11: Obtain the vehicle's required charging current and the charging performance data of the charging station.

[0035] In some embodiments of this application, the current required charging current of the vehicle's battery is determined by the vehicle's Battery Management System (BMS), while the current consumption of other related components of the vehicle is acquired. By combining the current required charging current of the battery and the current consumption of each component, the required charging current of the vehicle can be obtained. Before charging the vehicle's battery with a charging pile, the connection between the vehicle and the charging pile is established, and data communication between the vehicle and the charging pile during the charging process is achieved through signals. A request-response mechanism is used for communication between the vehicle and the charging pile to obtain charging performance data from the charging pile. For example, the vehicle sends a request to the charging pile for the current charging performance data of the charging pile to the vehicle, and the charging pile responds to the request and returns the current charging performance data to the vehicle. This charging performance data is used to characterize the charging capacity of the charging pile. When the charging demand is high, the target charging current can be adjusted according to this charging capacity to maximize the performance of the charging pile.

[0036] Step S12: Determine the vehicle's charging conditions based on the required charging current and charging performance data.

[0037] In some embodiments of this application, the charging status of the vehicle battery can be divided into various charging conditions based on the relationship between the required charging current and the charging performance data. For example, there are charging conditions where the required charging current is less than the charging current corresponding to the charging pile's charging capacity, and charging conditions where the required charging current is greater than or equal to the charging current corresponding to the charging pile's charging capacity. Different charging currents are required under different charging conditions to improve charging efficiency without damaging the charging pile and the electronic components on the charging lines, and to ensure continuous charging. This application's embodiments mainly address the charging condition where the required charging current is greater than or equal to the charging current corresponding to the charging pile's charging capacity. Under this condition, the charging pile often charges the vehicle at its maximum output power. However, charging at maximum output power has reached the charging pile's hardware capacity limit. Fluctuations during charging can easily cause the charging pile to exceed this limit, potentially damaging related electronic components in the vehicle or charging pile, such as the charging socket, charging cable, and charging gun. For self-protection, the charging pile will automatically terminate charging at this time. Therefore, under this charging condition, the charging current needs to be adjusted to ensure continuous charging. Based on this, step S12 is mainly used to accurately determine the charging condition where the required charging current is greater than or equal to the charging capacity of the charging pile, so that the charging current under the charging condition can be adjusted in the future.

[0038] Step S13: If the charging condition indicates that the vehicle's charging demand is greater than or equal to the charging capacity of the charging pile, then adjust the vehicle's target charging current according to the demand charging current and charging performance data so that the target charging current is lower than the charging current corresponding to the charging capacity.

[0039] If the charging condition indicates that the vehicle's charging demand is greater than or equal to the charging pile's charging capacity, then the charging current of the charging pile needs to be increased as much as possible to meet the vehicle's charging demand, such as charging directly at maximum output power in related technologies. However, considering that fluctuations during the charging process may cause the charging pile to exceed its hardware capacity limit and trigger a charging interruption, in this embodiment, the target charging current of the vehicle is adjusted according to the required charging current and charging performance data. The charging performance data can characterize the charging pile's charging capacity, so the target charging current obtained is related to the charging pile's charging capacity, which can maximize the charging pile's performance. Adjusting the target charging current to be lower than the charging current corresponding to the charging pile's charging capacity ensures that fluctuations during the charging process will not exceed the charging pile's hardware capacity limit, and the charging pile will not interrupt the charging process for self-protection, thus ensuring the continuity of charging. Ensuring continuous charging of the vehicle, compared to the charging process being interrupted due to exceeding the charging pile's hardware capacity limit, can significantly improve charging efficiency and shorten charging time.

[0040] It should be noted that the above charging current adjustment process is real-time. The vehicle controller obtains the vehicle's required charging current in real time, and at the same time receives the charging performance data of the charging pile transmitted by the charging pile. Then, it adjusts the target charging current in real time according to the required charging current and the charging performance data.

[0041] The vehicle charging current adjustment method of this application determines the vehicle's charging conditions based on the acquired demand charging current and charging performance data. When the charging demand is greater than or equal to the charging capacity of the charging pile, the target charging current of the vehicle is adjusted according to the demand charging current and charging performance data. This can maximize the performance of the charging pile. Since the target charging current is lower than the charging current corresponding to the charging capacity, the charging continuity can be guaranteed, thereby improving charging efficiency and shortening charging time.

[0042] To more clearly illustrate the technical solutions provided in the embodiments of this application, the following provides a further description of a vehicle charging current adjustment method provided in this application.

[0043] In some embodiments of this application, see Figure 3To accurately obtain the required charging current of the vehicle, in step S11, the current required charging current of the vehicle's battery is obtained; the actual current consumed by the target load in the vehicle is detected, the target load including the compressor, electric heater, voltage converter, and motor; the sum of the current required charging current and the actual current consumed by the target load is calculated to obtain the required charging current of the vehicle. Here, corresponding current sensors can be used to detect the actual current consumed by the compressor, electric heater, voltage converter (DC / DC), and motor respectively. For example, a sampling resistor can be used to convert the detected current into voltage for detection, and then the current is calculated based on the detected voltage. Alternatively, a current detection device can be directly used to detect the actual current consumed; no specific limitation is made here. The current required charging current of the battery is the charging current required by the battery itself in the vehicle. A current sensor can be used to detect the current charging current of the vehicle's battery, which is the current required charging current of the battery. During the charging process of the charging pile, in order to ensure the normal operation of the charging process, some components in the charging pile and the vehicle will inevitably operate as loads and consume current. Therefore, when determining the required charging current of the vehicle, in addition to the required charging current of the battery itself, the current consumed by the target load also needs to be considered. The target load may not be limited to the compressor, electric heater, voltage converter, and motor. If other components consume current during the charging process, the corresponding current consumption can also be added. The specific details can be adjusted according to the actual situation. In this embodiment, the vehicle's required charging current includes not only the current required charging current of the battery itself but also the actual current consumed by the vehicle or charging pile components during the charging process. This accurately measures the vehicle's actual required charging current, preventing the target load from consuming all or most of the charging power during the charging process, thus avoiding slow battery charging.

[0044] In some embodiments of this application, the charging performance data includes at least the maximum output current and maximum output power of the charging pile. The maximum output current and maximum output power define the charging capacity of the charging pile to charge the vehicle. Based on this, in step S12, optionally, the product of the required charging current and the required charging voltage is calculated to obtain the required charging power of the vehicle; based on the relationship between the required charging current and the maximum output current, and / or the relationship between the required charging power and the maximum output power, the charging condition of the vehicle is determined. Wherein, the required charging voltage is the current voltage of the battery in the vehicle.

[0045] The charging current adjustment in this embodiment primarily targets the constant current charging process. During constant current charging, the required charging voltage continuously increases as the charging process continues. The required charging power, obtained by multiplying the required charging voltage by the required charging current, also continuously increases. Thus, the vehicle's charging condition can be determined based on the required charging current and required charging power. When determining the vehicle's charging condition, not only is the relationship between the required charging current and the maximum output current compared, but also the relationship between the required charging power and the maximum output power. Determining the vehicle's charging condition based on these two sets of relationships accurately distinguishes different charging situations, especially accurately identifying charging conditions where the charging demand is greater than or equal to the charging capacity of the charging station. This allows for convenient adjustment of the corresponding target charging current based on the charging condition, achieving stable and efficient charging.

[0046] To accurately determine different charging conditions for vehicles, in some embodiments of this application, if the required charging current is less than the maximum output current, the vehicle is determined to be in a first charging condition. The first charging condition indicates that the vehicle's charging demand is less than the charging capacity of the charging station. The charging process of a vehicle battery is divided into a constant current charging stage and a constant voltage charging stage. If the vehicle's required charging current is less than the charging station's maximum output current, it indicates that the vehicle is likely in the pre-charging stage of the constant current charging stage or the constant voltage charging stage. If the vehicle is in the constant voltage charging stage, as the charging process continues, the required charging current gradually decreases until it reaches zero, indicating that charging is complete. Of course, in practical applications, charging completion can be indicated when the required charging current decreases to near zero, at which point charging stops. During this constant voltage charging stage, both the required charging current and the required charging power gradually decrease, making it unlikely that the charging demand will be greater than or equal to the charging capacity of the charging station. If the vehicle is in the pre-charging stage of constant current charging, the required charging current is much smaller than the maximum output current. Although the required charging voltage increases continuously during this charging stage, the increase is not significant. Before the required charging power equals the maximum output power, the vehicle will enter the normal constant current charging stage. Therefore, in the pre-charging stage of constant current charging, the corresponding required charging power is also much smaller than the maximum output power.

[0047] If the required charging current is greater than or equal to the maximum output current, and the required charging power is less than the reference output power, the vehicle is determined to be in the second charging condition. The second charging condition indicates that the vehicle's charging demand is close to the charging capacity of the charging station. The reference output power is the difference between the maximum output power and the preset redundant output power. Specifically, the reference output power can be the difference between the maximum output power and the preset redundant output power P1. The redundant output power P1 can be a range, not a fixed constant value, for example, a range of 300-500W. This allows for different parameters to be determined for different markets to accurately determine the output power to consider. If the required charging current is greater than or equal to the maximum output current, and the required charging power is less than the maximum output power, it indicates that the vehicle is in the normal constant current charging stage. Although the required charging voltage is continuously increasing, the increase in the battery's required charging voltage is not significant enough to make the required charging power greater than or equal to the maximum output power. In other words, the vehicle's charging demand at this time is only close to the charging capacity of the charging station, but still less than the charging capacity of the charging station. Under the second charging condition, the fluctuations in the required charging current or voltage during the charging process are insufficient to reach the upper limit of the charging pile's hardware capacity. In this case, the charging process can be guaranteed to be continuous and efficient.

[0048] If the required charging current is greater than or equal to the maximum output current, and the required charging power is greater than or equal to the maximum output power, the vehicle is determined to be in the third charging condition. The third charging condition indicates that the vehicle's charging demand is greater than or equal to the charging station's charging capacity. When both the required charging current and the required charging power are greater than or equal to the maximum output current, it means the vehicle is in the latter half of the constant current charging stage, with the charging voltage continuously rising. At this point, the vehicle's charging demand is greater than or equal to the charging station's charging capacity, and any fluctuations in the required charging current or voltage are more likely to exceed the charging station's hardware capacity limit, causing the charging station to automatically interrupt the charging process as a self-protection mechanism.

[0049] This application can accurately determine the charging conditions where the charging demand is greater than or equal to the charging capacity of the charging pile by comparing the required charging current with the maximum output current and the required charging power with the maximum output power. Under these charging conditions, there is a risk that the charging pile will cause the charging to be interrupted due to the maximum output power. Subsequently, the corresponding charging current can be adjusted mainly for these charging conditions.

[0050] Based on the aforementioned process of determining charging conditions, when the vehicle's charging demand is greater than or equal to the charging capacity of the charging pile, fluctuations can easily cause interruptions in the charging process controlled by the charging pile. Therefore, to ensure stable and continuous charging under these conditions, in some embodiments of this application, a first charging current is calculated based on the required charging current and charging performance data; a first reserved charging current is determined based on the required charging power, charging performance data, and ambient temperature; and the difference between the first charging current and the first reserved charging current is calculated to obtain the target charging current. The first charging current, calculated based on the required charging current and charging performance data, represents the charging current corresponding to the charging capacity of the charging pile under the given hardware conditions. The first reserved charging current, determined based on the required charging power, charging performance data, and ambient temperature, characterizes the current fluctuations that may occur under the current environmental conditions during the charging process. The difference between the first charging current and the first reserved charging current is taken as the target charging current. The target charging current obtained in this way is based on the charging current corresponding to the charging capacity of the charging pile under the hardware conditions of the charging pile, minus the current fluctuations that may be caused by the current conditions under the current environment during the charging process. The target charging current can maximize the performance of the charging pile, and at the same time prevent charging interruption caused by exceeding the upper limit of the charging pile's carrying capacity, thus ensuring the continuity of charging, improving charging efficiency, and shortening charging time.

[0051] To maximize the performance of the charging pile using the first charging current, the charging performance data also includes the maximum allowable charging current. The first charging current is determined based on this maximum allowable charging current, the required charging current, and the maximum output current. In some embodiments of this application, the minimum value among the required charging current, the maximum allowable charging current, and the maximum output current is selected to obtain the second charging current; the ratio of the maximum output power to the required charging voltage is calculated, and the minimum value between the second charging current and this ratio is selected to obtain the first charging current. Alternatively, the minimum value among the required charging current, the maximum allowable charging current, and the maximum output current can be directly selected to obtain the second charging current. See also... Figure 3 First, the minimum value between the vehicle's required charging current and the maximum permissible charging current is selected to obtain the third charging current. Then, the minimum value between the third charging current and the maximum output current is selected to obtain the second charging current. It should be noted that the maximum permissible charging current refers to the maximum charging current that each piece of hardware in the charging line between the vehicle and the charging station can allow. Specifically, it can be the maximum permissible charging current of the charging socket, charging gun, and charging cable; that is, the minimum value among the maximum permissible charging current of the charging socket, charging gun, and charging cable is taken. Thus, the second charging current is the maximum permissible charging current of the charging line.

[0052] It should be noted that in some embodiments of this application, under the first charging condition, the vehicle's required charging power is much less than the maximum output power. In this case, fluctuations during the charging process do not affect the stable and continuous charging process, and therefore, fluctuations during the charging process do not need to be considered. Similarly, under the second charging condition, fluctuations during the charging process do not affect the stable and continuous charging process, and again, fluctuations during the charging process do not need to be considered. Therefore, under both the first and second charging conditions, the previously determined second charging current can be used as the target charging current.

[0053] Since the required charging voltage is the current voltage of the vehicle battery, the ratio of the maximum output power to the required charging voltage is the charging current corresponding to the maximum output power of the charging pile under the current charging conditions. The minimum value between the second charging current and this ratio is selected to obtain the first charging current. Thus, the first charging current, determined based on the charging line conditions and the maximum output power of the charging pile, maximizes the charging performance of the charging pile.

[0054] During the charging process, current fluctuations may occur when a charging pile charges a vehicle. Therefore, in some embodiments of this application, the charging performance data also includes the peak value of the output current fluctuation. The peak value of the output current fluctuation refers to the largest fluctuating current during the charging process. As long as the charging process is guaranteed not to be interrupted when the current fluctuates to its maximum, charging interruptions due to current fluctuations will not occur throughout the entire charging process. Based on this, see [link to relevant documentation]. Figure 4 The difference between the required charging power and the maximum output power of the charging pile is calculated to obtain the difference power P2. Based on the difference power P2 and the peak value of the output current fluctuation, a preset first mapping relationship is used to obtain the second reserved charging current. The first mapping relationship records the correspondence between the difference power, the peak value of the output current fluctuation, and the second reserved charging current. The first reserved charging current is obtained based on the second reserved charging current and the ambient temperature. Here, the difference power P2 represents the charging power exceeding the maximum output power of the charging pile. The peak value of the current fluctuation represents the maximum value of the current fluctuation that may occur during the charging process. The first mapping relationship is a two-dimensional table, as shown in Table 1 below. The second reserved charging current is uniquely determined based on the difference power P2 and the peak value of the output current fluctuation. This first mapping relationship is pre-stored in the vehicle controller. The data in the table are empirical reference values ​​and can be adjusted appropriately according to changes in hardware or environmental conditions. That is, the values ​​in the first mapping relationship are not fixed.

[0055] Table 1. First mapping relationship between the second reserved charging current and the differential power and peak output current fluctuation.

[0056]

[0057] The first mapping relationship is found based on the differential power P2 and the peak value of the output current fluctuation. The corresponding value in the first mapping relationship is used as the second reserved charging current. The second reserved charging current fully considers the impact of current fluctuations on the charging process.

[0058] The charging process of a charging pile is also affected by ambient temperature. Within a certain range of ambient temperature, the higher the ambient temperature, the better the performance of the vehicle battery, and the charging current can be appropriately increased. In some embodiments of this application, an ambient temperature factor can be obtained based on a preset second mapping relationship, which records the correspondence between the ambient temperature and the ambient temperature factor. The ambient temperature factor is determined based on the second mapping relationship shown in Table 2 below. The data in Table 2 are empirical reference values ​​and are not fixed. They can be adjusted appropriately according to changes in hardware conditions, environmental conditions, or charging needs.

[0059] Table 2. Second mapping relationship between ambient temperature factor and ambient temperature.

[0060] Ambient temperature factor 1 1 1 1 0.96 0.9

[0061] After obtaining the ambient temperature factor, the product of the second reserved charging current and the ambient temperature factor is obtained to get the first reserved charging current. That is, the first reserved charging current is obtained by multiplying the previously obtained second reserved charging current by the found ambient temperature factor. As can be seen from Table 2, the higher the ambient temperature, the smaller the ambient temperature factor, and the smaller the calculated first reserved charging current. The target charging current is equal to the difference between the first charging current and the first reserved charging current, indicating that the target charging current will increase slightly.

[0062] It is evident that the first reserved charging current not only considers the impact of current fluctuations on the charging process but also the influence of ambient temperature conditions. It should be noted that the ambient temperature cannot be too high. If the ambient temperature is too high, individual components in the charging circuit may overheat, potentially causing parts to burn out or triggering over-temperature protection, thus interrupting the charging process.

[0063] The vehicle charging current adjustment method of this application determines the vehicle's charging conditions based on the acquired demand charging current and charging performance data. When the electricity demand is greater than or equal to the charging capacity of the charging pile, the target charging current of the vehicle is adjusted according to the demand charging current and charging performance data. This can maximize the performance of the charging pile. Since the target charging current is lower than the charging current corresponding to the charging capacity, the charging continuity can be guaranteed, thereby improving charging efficiency and shortening charging time.

[0064] In one exemplary embodiment of this specification, a vehicle charging current regulating device is also provided, applied to a vehicle controller. For example... Figure 5 As shown, the vehicle charging current regulating device 600 includes:

[0065] The data acquisition module 501 is used to acquire the vehicle's required charging current and the charging performance data of the charging pile;

[0066] The operating condition determination module 502 is used to determine the charging operating condition of the vehicle based on the required charging current and charging performance data.

[0067] The current adjustment module 503 is used to adjust the target charging current of the vehicle according to the required charging current and the charging performance data if the charging condition indicates that the charging demand of the vehicle is greater than or equal to the charging capacity of the charging pile, so that the target charging current is lower than the charging current corresponding to the charging capacity.

[0068] In one specific implementation, the charging performance data includes at least the maximum output current and maximum output power of the charging pile; the operating condition determination module 502 is used to: calculate the product of the required charging current and the required charging voltage to obtain the required charging power of the vehicle, wherein the required charging voltage is the current voltage of the battery in the vehicle; and determine the charging operating condition of the vehicle based on the relationship between the required charging current and the maximum output current, and / or the relationship between the required charging power and the maximum output power.

[0069] In some implementations, the operating condition determination module 502 is further configured to: determine that the vehicle is in a first charging condition if the required charging current is less than the maximum output current, wherein the first charging condition indicates that the vehicle's charging demand is less than the charging capacity of the charging pile; determine that the vehicle is in a second charging condition if the required charging current is greater than or equal to the maximum output current and the required charging power is less than a reference output power, wherein the second charging condition indicates that the vehicle's charging demand is close to the charging capacity of the charging pile, and the reference output power is the difference between the maximum output power and a preset redundant output power; and determine that the vehicle is in a third charging condition if the required charging current is greater than or equal to the maximum output current and the required charging power is greater than or equal to the maximum output power, wherein the third charging condition indicates that the vehicle's charging demand is greater than or equal to the charging capacity of the charging pile.

[0070] In some embodiments, the current regulation module 503 is further configured to: calculate a first charging current based on the required charging current and the charging performance data; determine a first reserved charging current based on the required charging power, the charging performance data and the ambient temperature; and calculate the difference between the first charging current and the first reserved charging current to obtain a target charging current.

[0071] In some embodiments, the charging performance data further includes the maximum allowable charging current, and the current adjustment module 503 is further configured to: select the minimum value among the required charging current, the maximum allowable charging current, and the maximum output current to obtain a second charging current; calculate the ratio of the maximum output power to the required charging voltage, and select the minimum value of the second charging current and the ratio to obtain the first charging current.

[0072] In some implementations, the charging performance data also includes the peak value of the output current fluctuation; the current adjustment module 503 is further configured to: calculate the difference between the required charging power and the maximum output power of the charging pile to obtain the difference power; find a preset first mapping relationship based on the difference power and the peak value of the output current fluctuation to obtain a second reserved charging current, wherein the first mapping relationship records the correspondence between the difference power and the peak value of the output current fluctuation and the second reserved charging current; and obtain the first reserved charging current based on the second reserved charging current and the ambient temperature.

[0073] In some embodiments, the current adjustment module 503 is further configured to: obtain an ambient temperature factor based on a preset second mapping relationship according to the ambient temperature, wherein the second mapping relationship records the correspondence between the ambient temperature and the ambient temperature factor; and obtain the product of the second reserved charging current and the ambient temperature factor to obtain the first reserved charging current.

[0074] In some embodiments, the data acquisition module 501 is further configured to: acquire the current required charging current of the battery in the vehicle; detect the actual current consumed by a target load in the vehicle, the target load including a compressor, an electric heater, a voltage converter, and a motor; calculate the sum of the current required charging current and the actual current consumed by the target load to obtain the required charging current of the vehicle.

[0075] Specific limitations regarding the vehicle charging current regulation device can be found in the limitations regarding the vehicle charging current regulation method described above, and will not be repeated here. Each module in the aforementioned vehicle charging current regulation device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0076] Regarding the apparatus in the above embodiments, the specific manner in which each unit performs its operation has been described in detail in the embodiments concerning the vehicle charging current adjustment method, and will not be elaborated upon here.

[0077] Figure 6 This is a schematic diagram of the structure of a vehicle controller provided in an embodiment of this application.

[0078] For example, such as Figure 6 As shown, the vehicle controller 600 includes a memory 601 and a processor 602. The memory 601 stores executable program code 6011, and the processor 602 is used to call and execute the executable program code 6011 to perform the vehicle charging current adjustment method.

[0079] The vehicle controller provided in this embodiment is used to execute the above-described vehicle charging current adjustment method, and thus can achieve the same effect as the above-described implementation method.

[0080] When using integrated units, the vehicle controller may include a processing module and a storage module. The processing module is used to control and manage the vehicle's movements. The storage module supports the vehicle controller in executing program code and data.

[0081] The processing module may be a processor or a controller, which can implement or execute various exemplary logic blocks, modules, and circuits as disclosed in this application. The processor may also be a combination of functions that implement computation, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc., and the storage module may be a memory.

[0082] This embodiment also provides a computer-readable storage medium (including but not limited to disk storage, CD-ROM, optical storage, etc.) storing computer program code. When the computer program code is run on a computer, the computer executes the above-mentioned related method steps to implement the vehicle charging current adjustment method provided in the above embodiment. The computer-readable storage medium may include, but is not limited to, any type of disk, including floppy disks, optical disks, Digital Video Discs (DVDs), Compact Disc Read-Only Memory (CD-ROMs), microdrives, and magneto-optical disks, read-only memory (ROMs), random access memory (RAMs), erasable programmable read-only memory (EPROMs), electrically erasable programmable read-only memory (EEPROMs), dynamic random access memory (DRAMs), video random access memory (VRAMs), flash memory devices, magnetic cards or optical cards, nanosystems (including molecular memory ICs), or any type of medium or device suitable for storing instructions and / or data.

[0083] This embodiment also provides a computer program product. When the computer program product is run on a computer, it causes the computer to perform the above-mentioned related steps to realize the vehicle charging current adjustment method provided in the above embodiment.

[0084] The beneficial effects of the above embodiments can be referred to the beneficial effects of the corresponding methods provided above, and will not be repeated here.

[0085] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0086] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0087] In the description of this disclosure, it should be understood that if the terms "upper", "lower", "front", "rear", "left" and "right" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0088] It should be noted that, in the embodiments of this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0089] The above are merely embodiments of this disclosure and are not intended to limit the scope of this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of the claims of this disclosure.

Claims

1. A method for adjusting vehicle charging current, characterized in that, The method includes: Obtain the vehicle's required charging current and the charging performance data of the charging pile; the charging performance data includes at least the charging pile's maximum output current, maximum output power, maximum allowable charging current, and peak output current fluctuation. The required charging power of the vehicle is obtained by calculating the product of the required charging current and the required charging voltage, where the required charging voltage is the current voltage of the battery in the vehicle. The charging conditions of the vehicle are determined based on the required charging current and the charging performance data. If the required charging current is greater than or equal to the maximum output current, and the required charging power is greater than or equal to the maximum output power, then the vehicle is determined to be in the third charging condition, which indicates that the vehicle's charging demand is greater than or equal to the charging capacity of the charging pile. The minimum value among the required charging current, the maximum allowable charging current, and the maximum output current is selected to obtain the second charging current; Calculate the ratio of the maximum output power to the required charging voltage, select the minimum value of the second charging current and the ratio, and obtain the first charging current; Calculate the difference between the required charging power and the maximum output power to obtain the difference power; The second reserved charging current is obtained by finding a preset first mapping relationship based on the differential power and the peak value of the output current fluctuation; the first mapping relationship records the correspondence between the differential power and the peak value of the output current fluctuation and the second reserved charging current. The first reserved charging current is obtained based on the second reserved charging current and the ambient temperature; The target charging current is obtained by calculating the difference between the first charging current and the first reserved charging current.

2. The method according to claim 1, characterized in that, Determining the vehicle's charging conditions based on the required charging current and charging performance data includes: The charging conditions of the vehicle are determined based on the relationship between the required charging current and the maximum output current, and / or the relationship between the required charging power and the maximum output power.

3. The method according to claim 2, characterized in that, The vehicle charging conditions determined based on the relationship between the required charging current and the maximum output current, and / or the relationship between the required charging power and the maximum output power, include: If the required charging current is less than the maximum output current, the vehicle is determined to be in a first charging condition. The first charging condition indicates that the vehicle's charging demand is less than the charging capacity of the charging pile, and the target charging current is set as the second charging current. If the required charging current is greater than or equal to the maximum output current, and the required charging power is less than the reference output power, then the vehicle is determined to be in a second charging condition, and the target charging current is set as the second charging current; the second charging condition indicates that the vehicle's charging demand is close to the charging capacity of the charging pile, and the reference output power is the difference between the maximum output power and the preset redundant output power.

4. The method according to claim 2, characterized in that, The step of adjusting the target charging current of the vehicle based on the required charging current and the charging performance data includes: Calculate the first charging current based on the required charging current and the charging performance data; The first reserved charging current is determined based on the required charging power, the charging performance data, and the ambient temperature.

5. The method according to claim 1, characterized in that, The step of obtaining the first reserved charging current based on the second reserved charging current and the ambient temperature includes: An ambient temperature factor is obtained based on the ambient temperature according to a preset second mapping relationship, wherein the second mapping relationship records the correspondence between the ambient temperature and the ambient temperature factor. The first reserved charging current is obtained by multiplying the second reserved charging current by the ambient temperature factor.

6. The method according to claim 1, characterized in that, The process of obtaining the vehicle's required charging current includes: Obtain the current required charging current of the battery in the vehicle; The actual current consumption of a target load in the vehicle is detected, the target load including a compressor, an electric heater, a voltage converter, and a motor; The required charging current of the vehicle is obtained by calculating the sum of the current required charging current and the actual current consumed by the target load.

7. A vehicle controller, characterized in that, The vehicle controller includes: Memory, used to store executable program code; A processor is configured to call and run the executable program code from the memory, causing the vehicle controller to perform the method as described in any one of claims 1 to 6.

8. A vehicle, characterized in that, The vehicle includes: a charging interface, a battery connected to the charging interface, a battery management system, and a vehicle controller as described in claim 7, wherein the battery management system is connected to the battery, and the vehicle controller is also connected to the battery management system.

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