Vehicle, charging method thereof, and storage medium

Abstract

A vehicle, a charging method thereof, and a storage medium are disclosed. The vehicle charging method includes the steps of obtaining a first voltage of a charging port of the vehicle, determining a step-down target value according to the first voltage, adjusting a voltage on the step-down side of a step-up / step-down module of the vehicle according to the step-down target value, and sending the step-down target value to a charging pile to allow the charging pile to determine an output voltage according to the step-down target value, and increasing a charging request current of the vehicle to a maximum allowable charging current of the vehicle after the vehicle enters a charging process.

Description

Technical Field

[0001] This application claims the priority of Chinese Patent Application No. 202111164427.1, titled "Vehicle, Its Charging Method and Storage Medium", filed with the State Intellectual Property Office of China on September 30, 2021, and all of its contents are incorporated herein by reference.

[0002] This application relates to the technical field of vehicle charging, and particularly to a vehicle, its charging method and a storage medium.

Background Art

[0003] In order to adapt to different voltage platforms, in the related art, a charging switching method, system and vehicle for electric vehicles are provided. The method includes: when the vehicle performs a handshake with a target charging pile for charging, obtaining a first charging voltage which is the maximum charging voltage in the first charging circuit of the vehicle and a second charging voltage which is the maximum charging voltage in the second charging circuit of the vehicle; obtaining a first output voltage after the handshake is successful; when the first output voltage is equal to the first charging voltage, switching the charging voltage of the vehicle to the first charging voltage and sending a first command to the target charging pile; when the first output voltage is equal to the second charging voltage and the second output voltage is equal to the first output voltage, switching the charging voltage of the vehicle to the second charging voltage and sending a second command to the target charging pile.

[0004] However, although the above charging technology can adapt to different voltage platforms, since it is necessary to provide two or more charging circuits, the cost of the hardware device is high. And since the charging voltage is determined only after the handshake between the vehicle and the target charging pile for charging is successful, the subsequent charging process times out.

Summary of the Invention

[0005] This application aims to at least partly solve one of the technical problems in the related art. For this purpose, this application provides a vehicle, its charging method, and a storage medium.

[0006] In a first aspect, a vehicle charging method according to this application includes steps of obtaining a first voltage of a charging port of a vehicle, determining a buck target value based on the first voltage, adjusting a voltage on a buck side of a buck-boost module of the vehicle based on the buck target value, and transmitting the buck target value to a charging pile to cause the charging pile to determine an output voltage based on the buck target value, and after the vehicle enters a charging process, increasing a charging required current of the vehicle to a maximum allowable charging current of the vehicle.

[0007] In a second aspect, in a computer-readable storage medium storing a computer program according to this application, when the computer program is executed by a processor, the above vehicle charging method is realized.

[0008] In a third aspect, in a vehicle including an electronic device according to this application, the electronic device includes a memory, a processor, and a computer program stored in the memory, when the computer program is executed by the processor, the above vehicle charging method is realized.

[0009] The vehicle, its charging method, and storage medium according to embodiments of this application determine a buck target value based on the voltage of a charging port, and respectively transmit the buck target value to a buck-boost module and a charging pile, so that before the charging pile transmits a maximum output capacity message, the voltage output capacity of the charging pile can be determined, the initial buck target value of the buck-boost module can be increased, the small-power charging time in a boosting stage can be shortened or eliminated, and the charging power can be increased by increasing the charging voltage on the buck side of the buck-boost module.

[0010] Additional aspects and advantages of this application will be partly shown in the following description, partly become apparent in the following description, or be understood by implementing this application.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Mode for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present application will be described in detail. Examples of the above embodiments are shown in the drawings, and the same or similar reference numerals throughout denote the same or similar elements, or elements having the same or similar functions. Hereinafter, the embodiments described with reference to the drawings are merely exemplary and are for the purpose of interpreting the present application and should not be understood as limiting the present application.

[0013] At present, there are multiple types of piezoelectric charging piles (DC charging piles) and vehicles that can be charged at multiple voltages in the market. In order to meet the applicable range of vehicles for charging piles, a buck-boost module can be added to vehicle 200. As shown in FIG. 1, vehicle 200 can determine the final charging voltage based on the maximum allowable output voltage of charging pile 100 in the charging configuration stage.

[0014] During the charging process, after the vehicle receives a CML message including the maximum allowable output voltage transmitted from the charging pile, it charges at the initial charging request current in the charging stage and gradually increases the voltage on the buck side. Since this process needs to be continued for 2 - 3 minutes, it is easy to cause customer complaints. In addition, there is a situation where some charging piles falsely transmit the maximum allowable output voltage (actually 500V, but transmit 750V in CML). At this time, the falsely transmitted maximum allowable output voltage causes abnormal charging stop. Therefore, in the related art, it has been proposed to solve the problem that the charging pile falsely transmits the maximum allowable output voltage by judging that the output current of the charging pile decreases during the boost process (actually decreases to 0A, and the current value detected by the vehicle may be filtered and become larger, for example, 8A), and then reducing the voltage on the buck side. However, this method may cause misjudgment, and the vehicle may be charged at a low charging voltage with a high-voltage charging pile, resulting in a low charging power.

[0015] During the process of the vehicle being charged using the charging pile, the situation where the charging current decreases (actually decreases to 0A, and the current value detected by the vehicle may be filtered and become larger, for example, 5A - 8A) mainly has the following three situations.

[0016] For the first type, regarding the charging pile 100 with a voltage of 500V or higher, when the output voltage of the charging pile 100 or the charging required voltage of the vehicle 200 is greater than a certain value (for example, 500V), as shown in Figure 2, it is necessary to switch the power module of the charging pile 100 from the low-voltage charging mode to the high-voltage charging mode. Since the power module is turned off once, the output current of the charging pile 100 drops to 0A.

[0017] For the second type, regarding the charging pile 100 including a plurality of power modules, when the output voltage of each power module is all at a low voltage (for example, less than 500V) and it is necessary to normally charge a vehicle 200 with a high voltage (greater than 500V), when the charging required voltage or the charging voltage of the vehicle 200 is greater than a certain value (for example, 500V), as shown in Figure 3, for the charging pile 100, it is necessary to change the connection of two power modules from parallel connection to series connection so as to expand the output voltage range of the charging pile 100. Since it is necessary to turn off the power module of the charging pile 100 during the switching, the charging current drops to 0A.

[0018] For the third type, regarding the dual-gun DC charging pile including the intermediate contactors K7 and K8 with a voltage of 500V or higher, as shown in Figure 4, when vehicle A is charged using gun A, the intermediate contactors K7 and K8 are turned on, and two sets of power modules charge vehicle A simultaneously. When vehicle B is charged using gun B, the charging pile turns off the power module, turns off the intermediate contactors K7 and K8, and two sets of power modules charge two vehicles respectively. In this case, the output current of the charging pile 100 may drop to 0A.

[0019] To avoid misjudging the above three situations as the charging pile falsely transmitting the maximum output voltage in CML, and to shorten or eliminate the boost time of the vehicle, the present application provides a vehicle, its charging method, and a storage medium. Hereinafter, with reference to the drawings, the vehicle, its charging method, and the storage medium of the embodiments of the present application will be described.

[0020] Figure 5 is a flowchart of the vehicle charging method according to an embodiment of the present application.

[0021] As shown in FIG. 5, the vehicle charging method includes the following steps S1 to S3.

[0022] In S1, the first voltage of the charging port of the vehicle is obtained.

[0023] As an example, the first voltage Uport may be the maximum voltage of the charging port before the transmission of the handshake message (including the CHM handshake message and the BHM handshake message) between the vehicle and the charging pile stops.

[0024] Specifically, as shown in FIG. 6, after the charging gun of the charging pile (which may be a DC charging pile) is connected to the vehicle, the charging pile is started, the charging pile provides an auxiliary power supply, and the vehicle is started by the wake-up system. The vehicle controller 2 of the vehicle continuously detects the voltage of the charging port, the charging pile transmits the CHM handshake message, and the vehicle controller 1 returns the BHM handshake message (including the maximum allowable charging voltage of the vehicle). According to the requirements of B.3.3 of GB / T 18487.1-2015 "Electric Vehicle Conductive Charging System Part 1: General Requirements", after the vehicle returns the BHM handshake message, the charging pile needs to perform insulation detection. The charging pile adjusts the output voltage of the power module to min{Ubhm, Ucml}, where Ubhm is the maximum allowable charging voltage of the vehicle and Ucml is the maximum allowable output voltage of the charging pile. Before the transmission of the handshake message stops, the maximum voltage, that is, the first voltage, can be obtained from all the voltages of the charging port obtained.

[0025] The vehicle controller 1 and the vehicle controller 2 may be the BMS (Battery Management System) of the vehicle.

[0026] In S2, a buck target value is determined based on the first voltage, the voltage on the buck side of the vehicle's buck-boost module is adjusted based on the buck target value, and the buck target value is transmitted to the charging pile to cause the charging pile to determine an output voltage based on the buck target value.

[0027] Specifically, if the voltage on the buck side of the buck-boost module is determined after receiving the maximum allowable output voltage, it will cause a timeout in the subsequent charging process. Therefore, in the embodiments of the present application, an initial voltage on the buck side, that is, a buck target value Ubuck, is determined in advance based on the first voltage of the charging port. As shown in FIG. 6, after determining the buck target value, on the one hand, the buck target value is transmitted to the buck-boost module to adjust the voltage on the buck side of the buck-boost module to the buck target value to perform boost charging, buck charging, or full-open charging. Boost charging means that the vehicle boosts the low voltage at the charging port by means of a DC / DC module to a higher voltage of the vehicle's power battery. Buck charging means reducing the higher voltage of the battery pack to a lower voltage value via the vehicle's buck-boost module so as to be outputtable from the charging port. Full-open charging refers to an operating mode of the buck-boost module. In this operating mode, the buck-boost module does not perform voltage conversion, which is equivalent to the DC charging pile directly charging the power battery. On the other hand, the buck target value Ubuck is used as the power battery voltage in the BCP message (i.e., the current voltage of the power battery), and is transmitted to the charging pile via the BCP message to cause the charging pile to determine an output voltage based on the buck target value Ubuck.

[0028] In S3, after the vehicle enters the charging process, the vehicle's charging required current is increased to the vehicle's maximum allowable charging current.

[0029] Specifically, after the vehicle enters the charging process, the vehicle's charging required current may be directly increased to the vehicle's maximum allowable charging current. This can eliminate the small-current charging time and improve the charging power. It may be further determined whether to adjust the buck target value. If adjustment is necessary, after determining the buck target value, the vehicle's charging required current is increased to the vehicle's maximum allowable charging current. If adjustment is not necessary, the vehicle's charging required current is directly increased to the vehicle's maximum allowable charging current, thereby operating the charging pile in the maximum output voltage state and improving the charging power.

[0030] Accordingly, the vehicle charging method of the embodiment of the present application determines a buck target value based on the voltage of the charging port, and transmits the buck target value to the buck-boost module and the charging pile respectively, thereby pre-determining the voltage output capability of the charging pile, improving the initial buck target value of the buck-boost module, reducing or avoiding the timeout of the charging process, shortening or eliminating the low-power charging time in the boost stage, and improving the charging power.

[0031] In the embodiment of the present application, as shown in FIG. 6, after the vehicle sends a BCP message to the charging pile, the charging pile can send a CML message including the maximum allowable output voltage to the vehicle. The vehicle controller 1 determines whether to continue adjusting the buck target value after entering the charging process based on the maximum output voltage in the CML message. If not necessary, the charging request current is increased from the initial charging request current, for example, 20 A to the maximum allowable charging current. If necessary, the initial charging request current, for example, 20 A is maintained as it is, the buck target value is increased, and after determining the buck target value, the charging request current is increased from the initial charging request current, for example, 20 A to the maximum allowable charging current.

[0032] Referring to FIG. 6, after completing the processing of the CML message, the vehicle can send a battery charging request (BCL) message to the charging pile. After receiving the BCL message, the charging pile can send a charging pile charging status (CCS) message to the vehicle. During the charging process, the vehicle detects the charging current and the charging voltage, sends a battery charging status (BCS) message to the charging pile, and the vehicle further determines whether to adjust the buck target value based on the charging current. When it is necessary to end the charging, the charging pile sends a charging stop (CST) message to the vehicle. After receiving the CST message, the vehicle sends a charging end (BST) message to the charging pile and controls the buck-boost module to stop charging.

[0033] In some embodiments of the present application, the step of determining the buck target value based on the first voltage includes: obtaining the maximum allowable charging voltage of the vehicle and the power battery voltage (i.e., the current voltage of the power battery); when the first voltage is less than or equal to a first predetermined voltage which is a first difference between the maximum allowable charging voltage and a first predetermined value, determining the buck target value as a first target voltage and performing buck charging; when the first voltage is greater than the first predetermined voltage and less than or equal to the first difference, determining the buck target value as a second difference which is a difference between the first voltage and a second predetermined value and performing buck charging; and when the first voltage is greater than the first difference, determining the buck target value as the power battery voltage and performing full-open charging.

[0034] Specifically, as shown in FIG. 7, when the first voltage Uport ≤ U2 (i.e., the first predetermined voltage, for example, U2 = 360V), the vehicle controller 1 determines the buck target value as the first target voltage U, and transmits U to the buck-boost module and the charging pile respectively to perform buck charging, where U2 < Ubhm-a (i.e., the first difference). After entering the charging stage, the charging required current can be directly increased to the maximum allowable charging current of the vehicle to eliminate the small-current charging time during boosting and improve the charging power.

[0035] When U2 < Uport ≤ Ubhm-a, the vehicle controller 1 determines the buck target value as Uport-b (i.e., the second difference, and the value of b may be 30V), and transmits Uport-b to the buck-boost module and the charging pile respectively to perform buck charging. After entering the charging stage, the charging required current can be directly increased to the maximum allowable charging current of the vehicle to eliminate the small-current charging time during boosting and improve the charging power.

[0036] When Uport > Ubhm - a, the vehicle controller 1 determines the step - down target value as the power battery voltage Ubat (i.e., the current voltage of the power battery), and transmits Ubat to the buck - boost module and the charging pile respectively. At this time, the vehicle's buck - boost module can be controlled to be fully open to perform full - open charging. After entering the charging stage, the charging required current can be directly increased to the maximum allowable charging current of the vehicle, eliminating the small - current charging time during boosting and improving the charging power.

[0037] In some embodiments of the present application, before increasing the charging required current of the vehicle to the maximum allowable charging current of the vehicle, the method includes the steps of obtaining the maximum allowable output voltage Ucml of the charging pile, the power battery voltage Ubat of the vehicle, and the maximum allowable charging voltage Ubhm; when the maximum allowable output voltage is less than the smaller value of the maximum allowable charging voltage and a predetermined voltage threshold (Ucml < min{Ubhm, 750V}), increasing the step - down target value to the smaller value of the third difference, which is the difference between the power battery voltage and the fourth predetermined value c, and the fourth difference, which is the difference between the maximum allowable output voltage and the fifth predetermined value e, i.e., min{Ucml - e, Ubat - c}, and performing step - down charging; when the maximum allowable output voltage is greater than or equal to the smaller value of the maximum allowable charging voltage and the predetermined voltage threshold (Ucml < min{Ubhm, 750V}), increasing the step - down target value to the power battery voltage and performing full - open charging.

[0038] It should be noted that determining whether to adjust the step - down target value based on Ucml is premised on the fact that the step - down target value determined based on the first voltage is not the voltage for controlling buck - boost to perform full - open charging.

[0039] Furthermore, the vehicle charging method further includes the step of obtaining the charging current of the vehicle and adjusting the step - down target value based on the charging current.

[0040] In this embodiment, as one executable embodiment, as shown in FIG. 8, the step of determining the buck target value based on the first voltage may include: when the first voltage is less than or equal to the first difference, determining the buck target value as a first predetermined voltage smaller than the first difference, which is the difference between the maximum allowable charging voltage and the first predetermined value, and performing boost charging; and when the first voltage is greater than the first difference, determining the buck target value as the first predetermined voltage and performing boost charging.

[0041] In this embodiment, referring to FIG. 8, when the first voltage is less than or equal to the first difference, the step of adjusting the buck target value based on the charging current may include: when the charging current is less than the first predetermined current and continues for the first predetermined time, decreasing the buck target value by a third predetermined value to obtain a first target value, and keeping the ratio of the vehicle's charging required voltage to the charging required current unchanged; after decreasing the buck target value to the first target value, when the charging current is greater than the second predetermined current, increasing the buck target value according to a predetermined rule and performing boost charging again; and after performing boost charging again, when the charging current is less than the first predetermined current again and continues for the first predetermined time, decreasing the current buck target value by the third predetermined value.

[0042] The predetermined rule may be to increase the buck target value by a predetermined step size, for example, adjusting the buck target value every second predetermined time to increase the predetermined step size, or increasing the buck target value according to a predetermined curve, for example, increasing the buck target value linearly.

[0043] In this embodiment, after performing full-open charging, when the charging current is less than the first predetermined current and continues for the first predetermined time, the buck target value is decreased by a third difference.

[0044] It should be noted that in this embodiment, only when the first voltage Uport is greater than the first difference Ubhm-a, the first voltage Uport can be directly boosted to the full-open state, and there is no need to determine whether to adjust the buck target value based on the charging current during the boosting process, that is, whether to adjust the voltage on the buck side of the buck-boost module.

[0045] Specifically, as shown in FIG. 8, as an example, when Uport≦Ubhm-a, the vehicle controller 1 determines the buck target value as U2 (i.e., the first predetermined voltage, U2<Ubhm-a), and transmits U2 to the buck-boost module and the charging pile respectively to perform boost charging.

[0046] In this example, as the first implementation method, after entering the charging process, if Ucml<min{Ubhm,U0} (U0 is a predetermined voltage threshold value, and the value may be 750V), the buck-side voltage is adjusted to increase to Ubuck=min{Ucml-e,Ubat-c}, the buck charging state is maintained, the charging required current is increased to the maximum allowable charging current of the vehicle, and if Ucml≧min{Ubhm,U0}, the buck-side voltage is adjusted to boost to the power battery voltage Ubat, enter the full-open charging state, and the charging required current is increased to the maximum allowable charging current of the vehicle. After full-open charging, the charging current Ibcs of the vehicle is obtained. If Ibcs<I1 occurs and continues for ns, the buck-side voltage is adjusted to Ubuck=Ubat-c; otherwise, the full-open charging is maintained.

[0047] As the second implementation method, after entering the charging process, the charging current Ibcs of the vehicle is obtained. During the boost process, if Ibcs<I1 (i.e., the first predetermined current, for example, 5 to 8A) occurs and continues for the first predetermined time ns, the buck-side voltage is adjusted to Ubuck=Ubuck-d, and the ratio Ubcl / Ibcl of the charging required voltage and the charging required current of the vehicle is maintained as it is. When the charging current is greater than the second predetermined Current I2 (I2>I1), the buck-side voltage is increased according to a predetermined step size and boosted again. If Ibcs< I2 occurs and continues for ns, the current buck-side voltage is adjusted to Ubuck=Ubuck-d, and the buck-side voltage of the vehicle is maintained as it is until the charging is completed, and the charging required current is increased to the maximum allowable charging current of the vehicle.

[0048] Note that in this example, the second implementation method is performed first. In the second implementation method, if Ibcs is smaller than I1 and the condition that ns continues is not satisfied, the first implementation method may be performed. If the first implementation method is performed first and after adjusting to increase the buck-side voltage to Ubuck = min{Ucml - e, Ubat - c}, the second implementation method may be performed. Naturally, as described above, increasing the charging required current to the maximum allowable charging current of the vehicle is only done once.

[0049] As another example, when Uport > Ubhm - a, the vehicle controller 1 determines the buck target value as U2 (U2 < Ubhm - a), and transmits U2 to the buck - boost module and the charging pile respectively to perform boost charging. After entering the charging process, if Ucml < min{Ubhm, 750V}, adjust to increase the buck - side voltage to Ubuck = min{Ucml - e, Ubat - c}, maintain the buck - charging state, increase the charging required current to the maximum allowable charging current of the vehicle. If Ucml ≥ min{Ubhm, 750V}, adjust to boost the buck - side voltage to the power battery voltage Ubat, enter the fully - open state for charging, and increase the charging required current to the maximum allowable charging current of the vehicle. After fully - open charging, if Ibcs < I1 occurs and ns continues, adjust the buck - side voltage to Ubuck = Ubat - c and maintain buck - charging during the charging process.

[0050] As another feasible embodiment, the step of determining the buck target value based on the first voltage may include: when the first voltage is less than or equal to the second predetermined voltage, determining the buck target value as the first predetermined voltage smaller than the second predetermined voltage and performing boost charging; when the first voltage is greater than the second predetermined voltage and less than or equal to the first difference which is the difference between the maximum allowable charging voltage and the first predetermined value, determining the buck target value as the smaller value between the second difference which is the difference between the first voltage and the second predetermined value and the third difference which is the difference between the power battery voltage and the fourth predetermined value, and performing boost charging; when the first voltage is greater than the first difference, determining the buck target value as the power battery voltage and performing full - open charging.

[0051] In this embodiment, after performing boost charging, the step of adjusting the buck target value based on the charging current is as follows: when the charging current Ibcs is less than the first predetermined current and continues for the first predetermined time, the buck target value is decreased by the third predetermined value d to obtain the second target value, and the ratio Ubcl / Ibcl of the vehicle's required charging voltage to the required charging current is kept as it is; and after decreasing the buck target value to the second target value, when the charging current is greater than the second predetermined Current value, increasing the buck target value according to a predetermined rule and performing boost charging again; and after performing boost charging again, when the charging current is less than the first predetermined current and continues for the first predetermined time, decreasing the current buck target value by the third predetermined value.

[0052] The predetermined rule may be to increase the buck target value by a predetermined step size, for example, adjusting the buck target value every second predetermined time to increase the predetermined step size, or increasing the buck target value according to a predetermined curve, for example, increasing the buck target value linearly.

[0053] In this embodiment, after performing full-open charging, the step of adjusting the buck target value based on the charging current may further include the step of decreasing the buck target value to the third difference when the charging current is less than the first predetermined current and continues for the first predetermined time.

[0054] Specifically, as shown in FIG. 9, as an example, when Uport≤U1, the vehicle controller 1 determines the buck target value as U2, and transmits U2 to the buck-boost module and the charging pile respectively to perform boost charging, where U2<U1.

[0055] In this example, as one implementation method, after entering the charging process, the charging current Ibcs of the vehicle is obtained. If Ibcs<I1 occurs and continues for ns, the buck-side voltage is adjusted to Ubuck = Ubuck - d, and Ubcl / Ibcl is kept as it is. When the charging current is greater than I2, the buck-side voltage is increased according to a predetermined rule to perform boost charging, and Ibcs< I2If it occurs and lasts for ns, adjust the buck-side voltage to Ubuck = Ubuck - d. After the charging voltage stabilizes, raise the charging required current to the maximum allowable charging current of the vehicle again, and keep the buck-side voltage of the vehicle unchanged until the charging is completed.

[0056] As another implementation method, after entering the charging process, if Ucml < min{Ubhm, 750V}, adjust the buck-side voltage to be raised to Ubuck = min{Ucml - e, Ubat - c}, maintain the buck charging state, raise the charging required current to the maximum allowable charging current of the vehicle. If Ucml ≥ min{Ubhm, 750V}, adjust the buck-side voltage to be boosted to the power battery voltage Ubat, enter the full-open state for charging, and raise the charging required current to the maximum allowable charging current of the vehicle. After full-open charging, if Ibcs < I1 occurs and lasts for ns, adjust the buck-side voltage to Ubuck = Ubat - c. After the voltage stabilizes, raise the charging required current to the maximum allowable charging current of the vehicle again, and maintain buck charging during the charging process.

[0057] Note that in this example, first perform the second implementation method above. In the second implementation method, if the condition that Ibcs is smaller than I1 and lasts for ns is not satisfied, the first implementation method above may be performed. After first performing the first implementation method above and adjusting the buck-side voltage to be raised to Ubuck = min{Ucml - e, Ubat - c}, the second implementation method above may be performed. Of course, as described above, raising the charging required current to the maximum allowable charging current of the vehicle is only done once.

[0058] As another example, when U1 < Uport ≤ Ubhm - a, the vehicle controller 1 determines the buck target value as min{Uport - b, Ubat - c}, and sends min{Uport - b, Ubat - c} to the charging pile and the buck-boost module respectively to perform boost charging.

[0059] In this example, as one implementation method, after entering the charging process, obtain the charging current Ibcs of the vehicle, and Ibcs < I1If it occurs and lasts for ns, adjust the buck-side voltage to Ubuck = Ubuck - d, keep Ubcl / Ibcl unchanged, boost the voltage again after the charging current becomes greater than I2, and after boosting, Ibcs < I2 If it occurs and lasts for ns, adjust the buck-side voltage to Ubuck = Ubuck - d, keep the buck-side voltage of the vehicle unchanged until the charging is completed, and increase the charging required current to the maximum allowable charging current of the vehicle.

[0060] As another implementation method, after entering the charging process, if Ucml < min{Ubhm, 750V}, adjust to increase the buck-side voltage to Ubuck = min{Ucml - e, Ubat - c}, maintain the buck charging state, increase the charging required current to the maximum allowable charging current of the vehicle. If Ucml ≥ min{Ubhm, 750V}, adjust to boost the buck-side voltage to the power battery voltage Ubat, enter the fully open state for charging, and increase the charging required current to the maximum allowable charging current of the vehicle. After fully open charging, if Ibcs < I1 occurs and lasts for ns, adjust the buck-side voltage to Ubuck = Ubat - c, after the voltage stabilizes, increase the charging required current to the maximum allowable charging current of the vehicle again, and maintain buck charging during the charging process.

[0061] Note that in this example, the above second implementation method is performed first. In the second implementation method, if the condition that Ibcs is smaller than I1 and lasts for ns is not met, the above first implementation method may be performed. If the above first implementation method is performed first and the buck-side voltage is adjusted to increase to Ubuck = min{Ucml - e, Ubat - c}, the above second implementation method may be performed later. Of course, as described above, increasing the charging required current to the maximum allowable charging current of the vehicle is only done once.

[0062] As yet another example, when Uport > Ubhm - a, the vehicle controller 1 determines the buck target value as the power battery voltage Ubat, and transmits Ubat to the charging pile and the buck - boost module respectively to perform boost charging. After entering the charging process, the charging current Ibcs of the vehicle is acquired. If Ibcs < I1 (generally about 8 A) occurs and lasts for ns, the buck - side voltage is adjusted to Ubuck = Ubat - c. After the charging voltage stabilizes, the charging current is raised again to the maximum allowable charging current of the vehicle, and boost charging is maintained during the charging process.

[0063] It should be noted that the values of the first to fifth predetermined values (a, b, d, c, e), the first predetermined voltage U2, the second predetermined voltage U1, the first target voltage U, the first predetermined current I1, and the second predetermined current I2 can all be calibrated according to the actual charging requirements, and the power battery voltage Ubat all refers to the current voltage of the power battery.

[0064] From the above, the vehicle charging method of the embodiment of the present application can pre - determine the voltage output ability of the charging pile by judging the voltage of the charging port, increase the initial buck target value of the buck - boost module, and shorten the small - power charging time in the boost stage. If the voltage of the charging port meets the full - open condition, small - power charging can be eliminated, and the required current can be directly increased to the maximum allowable value of the vehicle. By using the condition of whether to callback the detected voltage value of the charging port, false triggering of false transmission of CML can be avoided, the charging voltage value and charging power can be increased, and through multiple callbacks, the maximum output voltage value of the charging pile can be confirmed and the charging power can be increased.

[0065] Based on the above vehicle charging method, the present application provides a computer - readable storage medium.

[0066] In this embodiment, a computer program is stored in the computer - readable storage medium. When the computer program is executed by a processor, the above vehicle charging method is realized.

[0067] Based on the above vehicle charging method, the present application further provides a vehicle.

[0068] In this embodiment, as shown in FIG. 10, the vehicle 200 includes an electronic device 210, and the electronic device 210 includes a memory 211, a processor 212, and a computer program 213 stored in the memory 211. When the computer program 213 is executed by the processor 212, the vehicle charging method is realized.

[0069] It should be noted that the logic and / or steps shown in the flowchart or described in other ways in the present disclosure may be regarded, for example, as an ordered list of executable instructions for realizing the logic function, and may be specifically realized on any computer-readable medium, so as to be used by an instruction execution system, apparatus or device (for example, a computer-based system, a system including a processor, or another system that can read instructions from an instruction execution system, apparatus or device and execute the instructions), or may be used in combination with these instruction execution systems, apparatuses or devices. In this specification, a "computer-readable medium" may be any device that can store, memorize, communicate, propagate or transmit a program for use by an instruction execution system, apparatus or device or in combination with these instruction execution systems, apparatuses or devices. More specific examples (non-exhaustive list) of computer-readable media include electrical connection parts (electronic devices) having one or more wirings, portable computer disk boxes (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber devices, and portable read-only memory (CDROM). Also, the computer-readable medium may further be, for example, paper or other media that can optically scan, then edit, interpret, or process in other appropriate ways as needed, electronically obtain the above program, and then store it in a computer memory, so it may be paper or other appropriate media on which the above program can be printed.

[0070] It should be understood that each part of the present application can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by an appropriate instruction execution system. For example, when implemented by hardware, similar to another embodiment, it can be implemented by any one or a combination of known techniques in this field, such as a discrete logic circuit having a logic gate circuit for realizing a logic function for a data signal, an application-specific integrated circuit having an appropriate combination logic gate circuit, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0071] In the description of this specification, descriptions referring to terms such as "one embodiment", "several embodiments", "example", "specific example", or "several examples" mean that the specific features, structures, materials, or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the exemplary descriptions of the above terms are not necessarily limited to the same embodiment or example. Also, the described specific features, structures, materials, or characteristics can be appropriately combined in any one or more embodiments or examples.

[0072] In addition, in the description of the present application, the orientation or positional relationship indicated by terms such as "center", "longitudinal direction", "lateral direction", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial direction", "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings, and is only for facilitating the explanation and simplifying the description of the present application, and does not indicate or imply that the shown device or component must have a specific orientation and be configured and operated in a specific orientation. Therefore, it should not be understood as limiting the present application.

[0073] Also, the terms "first" and "second" are merely for the purpose of explanation and should not be construed as indicating or suggesting relative importance or implicitly indicating the number of the recited technical features. Thus, the features defined by "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality" means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0074] In the present application, unless otherwise clearly specified and limited, terms such as "mounted", "connected", "connected to", "fixed" should be understood in a broad sense. For example, unless otherwise clearly limited, it may be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or a relationship of internal communication between two components or an interaction relationship between two components. A person skilled in the art can understand the specific meaning of the above terms in the present application according to the specific situation.

[0075] In the present application, unless otherwise clearly specified and limited, the fact that the first feature is "above" or "below" the second feature may include that the first feature is in direct contact with the second feature, or may include that the first feature is in indirect contact with the second feature through an intermediate medium. Also, the fact that the first feature is "above", "above" or "upper surface" of the second feature may include that the first feature is directly above and obliquely above the second feature, or may only represent that the horizontal height of the first feature is higher than the horizontal height of the second feature. The fact that the first feature is "below", "below" or "lower surface" of the second feature may include that the first feature is directly below and obliquely below the second feature, or may only represent that the horizontal height of the first feature is lower than that of the second feature.

[0076] As above, the embodiments of the present application have been shown and described. However, the above embodiments are exemplary and should not be understood as limiting the present application. A person skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application.

Claims

1. A step of obtaining a first voltage of a charging port of a vehicle; A step of determining a buck target value based on the first voltage, adjusting a voltage on the buck side of a buck-boost module of the vehicle based on the buck target value, and transmitting the buck target value to a charging pile to cause the charging pile to determine an output voltage based on the buck target value; After the vehicle enters a charging process, a step of increasing a charging required current of the vehicle to a maximum allowable charging current of the vehicle, The step of determining a buck target value based on the first voltage includes: A step of obtaining a maximum allowable charging voltage and a power battery voltage of the vehicle; When the first voltage is equal to or lower than a first predetermined voltage that is smaller than a first difference that is a difference between the maximum allowable charging voltage and a first predetermined value, determining the buck target value as a first target voltage and performing buck charging; When the first voltage is greater than the first predetermined voltage and equal to or lower than the first difference, determining the buck target value as a second difference that is a difference between the first voltage and a second predetermined value and performing buck charging; When the first voltage is greater than the first difference, determining the buck target value as the power battery voltage and performing full-open charging, wherein the vehicle charging method is characterized by the above.

2. A step of obtaining a first voltage of a charging port of a vehicle; A step of determining a buck target value based on the first voltage, adjusting a voltage on the buck side of a buck-boost module of the vehicle based on the buck target value, and transmitting the buck target value to a charging pile to cause the charging pile to determine an output voltage based on the buck target value; After the vehicle enters a charging process, a step of increasing a charging required current of the vehicle to a maximum allowable charging current of the vehicle, Before increasing the charging required current of the vehicle to the maximum allowable charging current of the vehicle, A step of obtaining a maximum allowable output voltage of a charging pile, a power battery voltage of the vehicle, and a maximum allowable charging voltage; When the maximum allowable output voltage is less than the smaller value of the maximum allowable charging voltage and a predetermined voltage threshold, increasing the buck target value to the smaller value of a third difference which is the difference between the power battery voltage and a fourth predetermined value and a fourth difference which is the difference between the maximum allowable output voltage and a fifth predetermined value, and performing buck charging; When the maximum allowable output voltage is greater than or equal to the smaller value of the maximum allowable charging voltage and the predetermined voltage threshold, further including the step of increasing the buck target value to the power battery voltage and performing full-open charging, wherein the vehicle charging method is characterized by the above.

3. The vehicle charging method according to claim 1, further including the step of acquiring the charging current of the vehicle and adjusting the buck target value based on the charging current.

4. The vehicle charging method according to claim 2, further including the step of acquiring the charging current of the vehicle and adjusting the buck target value based on the charging current.

5. The step of determining the buck target value based on the first voltage includes: When the first voltage is less than or equal to a first difference, determining the buck target value as a first predetermined voltage smaller than the first difference which is the difference between the maximum allowable charging voltage and a first predetermined value, and performing boost charging; When the first voltage is greater than the first difference, determining the buck target value as the first predetermined voltage and performing boost charging, wherein the vehicle charging method according to claim 1 is characterized by the above.

6. When the first voltage is less than or equal to the first difference, the step of adjusting the buck target value based on the charging current includes: When the charging current is less than a first predetermined current and continues for a first predetermined time, decreasing the buck target value by a third predetermined value to obtain a first target value, and keeping the ratio of the charging required voltage and the charging required current of the vehicle unchanged; After reducing the step-down target value to the first target value, if the charging current is greater than a second predetermined current, increasing the step-down target value according to a predetermined rule and performing boost charging again; After performing boost charging again, if the charging current is smaller than the first predetermined current again and continues for the first predetermined time, reducing the current step-down target value by the third predetermined value. The vehicle charging method according to claim 5, characterized by including this step.

7. The step of determining the step-down target value based on the first voltage is as follows: When the first voltage is less than or equal to a second predetermined voltage, determining the step-down target value as a first predetermined voltage smaller than the second predetermined voltage and performing boost charging; When the first voltage is greater than the second predetermined voltage and less than or equal to a first difference that is the difference between the maximum allowable charging voltage and a first predetermined value, determining the step-down target value as the smaller value between a second difference that is the difference between the first voltage and a second predetermined value and a third difference that is the difference between the power battery voltage and a fourth predetermined value, and performing boost charging; When the first voltage is greater than the first difference, determining the step-down target value as the power battery voltage and performing full-open charging. The vehicle charging method according to claim 1, characterized by including this step.

8. The step of adjusting the step-down target value based on the charging current after performing boost charging is as follows: When the charging current is smaller than a first predetermined current and continues for the first predetermined time, reducing the step-down target value by the third predetermined value to obtain a second target value and keeping the ratio of the charging required voltage and charging required current of the vehicle as it is; After reducing the step-down target value to the second target value, if the charging current is greater than a second predetermined current, increasing the step-down target value according to a predetermined rule and performing boost charging again; After performing boost charging again, when the charging current is less than the first predetermined current and continues for a first predetermined time, reducing the current buck target value by the third predetermined value, the vehicle charging method according to claim 7, characterized in that it includes this step.

9. After performing full-open charging, the step of adjusting the buck target value based on the charging current is When the charging current is less than the first predetermined current and continues for a first predetermined time, further including the step of reducing the buck target value to the first difference, the vehicle charging method according to claim 3, characterized in that it includes this step.

10. The first voltage is the maximum voltage of the charging port before the transmission of the handshake message between the vehicle and the charging pile stops, the vehicle charging method according to claim 1, characterized in that it includes this step.

11. A computer-readable storage medium storing a computer program, when the computer program is executed by a processor, realizing the vehicle charging method according to any one of claims 1 to 10, a computer-readable storage medium characterized in that it includes this step.

12. A computer program, when executed by a processor, realizing the vehicle charging method according to any one of claims 1 to 10, a computer program characterized in that it includes this step.

13. A vehicle including an electronic device including a memory, a processor, and a computer program stored in the memory, when the computer program is executed by the processor, realizing the vehicle charging method according to any one of claims 1 to 10, a vehicle characterized in that it includes this step.

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