Boost charging control method and device

Abstract

The invention discloses a boost charging control method and device. The method comprises the following steps: acquiring an insulation detection voltage of a charging pile and a maximum allowable voltage of the charging pile; if the charging pile insulation detection voltage and the charging pile maximum allowable voltage meet a preset judgment condition, the vehicle is controlled to enter a direct connection charging mode; in the direct connection charging mode, the current voltage of a vehicle battery pack is obtained; and if the current voltage of the battery pack meets the preset switching condition, the vehicle is controlled to be switched from a direct connection charging mode to a boost charging mode. According to the method, intelligent and accurate judgment of the output capacity of the charging pile is achieved, a dynamic optimization charging strategy is implemented in the single charging process, and the problems that the charging compatibility of a high-voltage platform vehicle type is poor, and the charging efficiency is limited by a traditional boosting scheme are solved.

Description

Technical Field

[0001] This invention relates to the field of charging control technology for new energy vehicles, and particularly to a control method and device for boost charging. Background Technology

[0002] Currently, with the rapid development of the new energy vehicle industry, the voltage platform of on-board power battery packs is showing a continuous upward trend, with 800V and higher voltage platforms gradually becoming the industry mainstream. However, the DC charging piles widely deployed in the market currently mainly output voltage levels of 500V and 750V. This difference in voltage platforms between the vehicle and the charging pile brings significant charging compatibility issues to high-voltage platform vehicles.

[0003] Specifically, when high-voltage platform vehicles (such as 800V models) are connected to intermediate voltage level charging piles (such as 750V piles) for charging, they face a dilemma: if a direct charging mode is used, although the maximum output power of the charging pile can be fully utilized to achieve rapid energy replenishment, the battery pack will not be fully charged due to the maximum output voltage of the charging pile, affecting the user's driving range; if a boost charging mode is used directly, although the battery pack can be fully charged, the boost process usually has power limitations, which cannot fully utilize the high power output capability of the charging pile, resulting in a significant extension of charging time and affecting the user experience.

[0004] Therefore, there is an urgent need for a control method that can intelligently identify the charging capacity of charging piles and dynamically switch charging modes during the charging process. This is to solve the technical contradiction between charging speed and charging integrity when high-voltage platform electric vehicles are charged on medium- and low-voltage charging piles, thereby improving the overall charging experience for users. Summary of the Invention

[0005] In order to achieve intelligent and accurate judgment of the output capacity of charging piles, and to implement dynamic optimization charging strategies during a single charging process, thereby solving the problems of poor charging compatibility and charging efficiency limited by traditional boost charging solutions faced by high-voltage platform vehicles, this invention provides a boost charging control method and device.

[0006] In a first aspect, embodiments of the present invention provide a boost charging control method, which may include: Obtain the insulation test voltage and maximum allowable voltage of the charging pile; If the insulation detection voltage of the charging pile and the maximum allowable voltage of the charging pile meet the preset judgment conditions, then the vehicle is controlled to enter the direct charging mode. In the direct charging mode, the current voltage of the vehicle battery pack is obtained; If the current voltage of the battery pack meets the preset switching conditions, the vehicle is controlled to switch from direct charging mode to boost charging mode.

[0007] In one or more optional embodiments of this application, the step of controlling the vehicle to enter direct charging mode if the insulation detection voltage of the charging pile and the maximum allowable voltage of the charging pile meet preset judgment conditions includes: If the insulation detection voltage of the charging pile is greater than the first voltage threshold, the insulation detection voltage of the charging pile is less than or equal to the second voltage threshold, and the maximum allowable voltage of the charging pile is greater than the first voltage threshold, then the preset judgment condition is determined to be met; wherein, the first voltage threshold is less than the second voltage threshold. Control the vehicle to enter direct charging mode.

[0008] In one or more optional embodiments of this application, the step of controlling the vehicle to switch from direct charging mode to boost charging mode if the current voltage of the battery pack meets a preset switching condition includes: If the current voltage of the battery pack is greater than or equal to the difference between the maximum allowable voltage of the charging pile and the preset voltage margin, it is determined that the preset switching condition is met. Control the vehicle to switch from direct charging mode to boost charging mode.

[0009] In one or more optional embodiments of this application, the preset safety voltage is obtained in the following manner: The preset safety voltage is obtained based on the current voltage of the battery pack and a preset safety factor; wherein the preset safety voltage is less than the maximum allowable voltage of the charging pile.

[0010] In one or more optional embodiments of this application, after controlling the vehicle to enter the boost charging mode, the method further includes: The output voltage of the charging pile is controlled to be maintained at the preset safe voltage; Obtain the maximum permissible current of the vehicle; The output current of the charging pile is adjusted to the maximum allowable current of the vehicle.

[0011] In a second aspect, embodiments of the present invention provide a boost charging control device, which may include: The first acquisition module is used to acquire the insulation detection voltage of the charging pile and the maximum allowable voltage of the charging pile. The first control module is used to control the vehicle to enter the direct charging mode if the insulation detection voltage of the charging pile and the maximum allowable voltage of the charging pile meet the preset judgment conditions. The second acquisition module is used to acquire the current voltage of the vehicle battery pack in the direct charging mode; The second control module is used to control the vehicle to switch from direct charging mode to boost charging mode if the current voltage of the battery pack meets the preset switching conditions.

[0012] Thirdly, embodiments of the present invention provide a computer-readable storage medium having a computer program / instruction stored thereon, which, when executed by a processor, implements the boost charging control method described above.

[0013] Fourthly, embodiments of the present invention provide a computer program product, including a computer program / instruction, which, when executed by a processor, implements the boost charging control method described above.

[0014] Fifthly, embodiments of the present invention provide a computer device, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the boost charging control method as described above.

[0015] The beneficial effects of the above-described technical solutions provided in the embodiments of the present invention include at least the following: This invention provides a boost charging control method. This method accurately identifies lower voltage charging piles by combining the insulation detection voltage and the maximum allowable voltage of the charging pile, effectively avoiding misjudgments caused by inaccurate insulation detection voltage. Secondly, based on accurate judgment, it prioritizes direct charging mode, fully utilizing the maximum output power of the charging pile and significantly improving the charging speed in the early stages. Finally, when the battery voltage reaches a preset switching condition, it intelligently switches to boost charging mode. This not only overcomes the voltage limitations of the charging pile, ensuring a full battery charge, but also maximizes overall charging efficiency through phased optimization. This effectively alleviates the technical contradiction between limited charging power and inability to fully charge the battery when using low-voltage charging piles for high-voltage platform electric vehicles.

[0016] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1A schematic flowchart of the boost charging control method provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the charging structure in the direct charging mode provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the charging structure in the boost charging mode provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the control device for boost charging provided in an embodiment of the present invention. Detailed Implementation

[0019] 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.

[0020] The inventors discovered that existing technologies lack a sophisticated, smooth control strategy that balances charging speed and full charge capability. Based on this, the inventors conducted further research and development, resulting in this invention, which provides a control method and apparatus for boost charging.

[0021] Example 1 Embodiment 1 of the present invention provides a control method for boost charging, referring to... Figure 1 As shown, the method may include the following steps S101-S104: S101: Obtain the insulation test voltage and maximum allowable voltage of the charging pile.

[0022] S102: If the insulation detection voltage of the charging pile and the maximum allowable voltage of the charging pile meet the preset judgment conditions, then control the vehicle to enter the direct charging mode.

[0023] S103: In direct charging mode, obtain the current voltage of the vehicle battery pack.

[0024] S104: If the current voltage of the battery pack meets the preset switching conditions, control the vehicle to switch from direct charging mode to boost charging mode.

[0025] This invention provides a boost charging control method. This method accurately identifies lower voltage charging piles by combining the insulation detection voltage and the maximum allowable voltage of the charging pile, effectively avoiding misjudgments caused by inaccurate insulation detection voltage. Secondly, based on accurate judgment, it prioritizes direct charging mode, fully utilizing the maximum output power of the charging pile and significantly improving the charging speed in the early stages. Finally, when the battery voltage reaches a preset switching condition, it intelligently switches to boost charging mode. This not only overcomes the voltage limitations of the charging pile, ensuring a full battery charge, but also maximizes overall charging efficiency through phased optimization. This effectively alleviates the technical contradiction between limited charging power and inability to fully charge the battery when using low-voltage charging piles for high-voltage platform electric vehicles.

[0026] In step S101 above, the insulation detection voltage of the charging pile and the maximum allowable voltage of the charging pile are obtained.

[0027] Specifically, the charging preparation phase begins after the charging gun and the vehicle's charging socket have physically connected and completed their handshake. During this phase, the charging station initiates an internal safety detection process, namely an insulation test. In this process, the charging station outputs a specific detection voltage to the vehicle; this voltage is the charging station's insulation test voltage.

[0028] The insulation test voltage for this charging pile varies depending on the charging pile manufacturer and specific design. Its purpose is to assess whether the insulation performance of the entire charging circuit meets the standards. However, some charging piles may set a test voltage lower than their actual maximum capacity in order to shorten the test time.

[0029] Meanwhile, a data link is established between the vehicle and the charging station via a standard communication protocol. The charging station sends its rated parameters to the vehicle via Charge Message Link (CML) messages, one key parameter of which is the charging station's maximum allowable voltage, representing the highest DC voltage that the charging station can theoretically output under normal charging conditions.

[0030] By obtaining the insulation test voltage and the maximum allowable voltage of the charging pile, the vehicle can obtain preliminary information about the output capacity of the charging pile. One is the instantaneous voltage based on actual physical testing, and the other is the nominal maximum voltage based on the communication protocol, providing a data basis for subsequent accurate judgment.

[0031] In step S102 above, if the insulation detection voltage of the charging pile and the maximum allowable voltage of the charging pile meet the preset judgment conditions, the vehicle is controlled to enter the direct charging mode. Specifically, this includes the following steps S1021-S1022: S1021: If the insulation detection voltage of the charging pile is greater than the first voltage threshold, the insulation detection voltage of the charging pile is less than or equal to the second voltage threshold, and the maximum allowable voltage of the charging pile is greater than the first voltage threshold, then the preset judgment condition is met. Wherein, the first voltage threshold is less than the second voltage threshold.

[0032] Specifically, this step aims to accurately identify and classify the actual voltage platform level of the charging pile based on the acquired voltage information. This is the primary prerequisite for implementing subsequent differentiated charging control strategies. To this end, two key logical judgment thresholds are pre-set: a first voltage threshold and a second voltage threshold. The setting of these two thresholds not only references the classification of DC charging pile voltage levels in national or industry standards and the mainstream voltage platforms in the market, but also closely integrates with the rated voltage platform of the vehicle's own power battery pack. The setting principle is: the first voltage threshold is used to distinguish low-voltage platform charging piles; the second voltage threshold is set to a value lower than the rated voltage of the vehicle's battery pack (e.g., 800V), corresponding to the typical upper limit of common intermediate voltage platform charging piles in the market. This setting makes the second voltage threshold a key dividing point for identifying charging pile categories whose maximum output voltage is lower than the voltage required to fully charge the vehicle's battery pack. The first voltage threshold can be set to 500V for example, and the second voltage threshold can be set to 750V for example.

[0033] The logic flow for the judgment is as follows: First, check whether the insulation detection voltage of the charging pile is greater than the first voltage threshold. If this condition is not met, it may indicate that the charging pile belongs to a lower voltage level and its maximum output capacity may not be able to meet the basic charging voltage requirements of the vehicle battery. Different initial strategies need to be considered, and incompatibility may even be indicated.

[0034] Secondly, check whether the insulation detection voltage of the charging pile is less than or equal to the second voltage threshold. If this condition is not met, it means that the insulation detection voltage of the charging pile is higher than the typical upper limit of the intermediate voltage platform, which strongly suggests that the charging pile is likely to belong to a higher voltage platform and the full direct connection charging mode should be given priority.

[0035] Finally, verifying whether the maximum allowable voltage of the charging pile is greater than the first voltage threshold aims to make a basic consistency check between the theoretical capability level declared in its communication message and the preliminary physical performance reflected by the insulation detection voltage of the charging pile. This enhances the reliability of the charging pile level judgment based on the insulation detection voltage and reduces the risk of misjudgment due to inaccurate information from a single path.

[0036] The preset judgment condition is satisfied if and only if all three conditions above are met simultaneously. This indicates that the category of the charging pile in practice usually corresponds to those charging piles labeled as having an intermediate voltage platform.

[0037] This step establishes a robust charging pile level identification mechanism by setting dual thresholds and cross-validating two types of voltage information. This avoids the risk of the entire charging strategy failing due to misjudgment of a single path information and provides accurate and reliable input for intelligent selection and switching of charging modes in subsequent steps.

[0038] S1022: Controls the vehicle to enter direct charging mode.

[0039] Specifically, the vehicle control system (including the battery management system and the vehicle controller) will immediately decide and execute the operation of entering the direct charging mode. Direct charging mode, also known as non-boost DC fast charging mode, connects the charging circuit inside the vehicle directly to the charging station and the battery pack via the simplest path.

[0040] The specific operation involves controlling the corresponding relays. Typically, the vehicle's high-voltage distribution box contains positive and negative relays to establish a direct charging circuit. The vehicle control system sends closing commands to these relays. Once closed, the positive and negative output terminals of the charging pile are directly connected to the positive and negative terminals of the battery pack via cables, the vehicle's charging socket, and the positive and negative relays, thus forming a direct power path without any voltage conversion devices.

[0041] A schematic diagram of the charging structure in direct charging mode is shown below. Figure 2 As shown in the diagram, the left side of the image shows the battery pack and its positive and negative terminals. The right side, from top to bottom, shows the charging socket of the charging station, the external boost distribution box, the motor inverter, and the stator winding. In direct-connect charging mode, the charging circuit consists only of the battery pack and its positive and negative terminals and the charging socket of the charging station. Figure 2 The loop formed by the blue and red arrows is the charging loop in the direct charging mode. Figure 2 Relays S3 and S4 in the diagram are the positive relay and the negative relay, respectively.

[0042] After completing the charging circuit connection, the battery management system (BMS) sends charging parameter configuration messages to the charging station via a communication network (such as a CAN bus). In these messages, the BMS calculates and requests an initial charging voltage and current requirement based on the battery's current state (such as temperature and state of charge). During this initial request phase, the voltage value requested by the BMS is based on the battery's current voltage, and explicitly instructs the charging station to use a constant current charging method.

[0043] After receiving these parameters, the charging station adjusts its internal power module to gradually increase the output voltage to match the battery voltage and maintain a constant current output, with the requested current as the target. At this point, the vehicle officially enters direct charging mode, and the electrical energy output from the charging station is directly and efficiently injected into the battery pack. Because the energy conversion losses of the boost stage are avoided, this stage fully utilizes the charging station's maximum output current capability at the current voltage, thereby maximizing charging power and making it the most effective stage for rapidly increasing battery capacity.

[0044] In step S103 above, in direct charging mode, the current voltage of the vehicle battery pack is obtained.

[0045] Specifically, once the vehicle successfully enters and operates in direct charging mode, the monitoring and strategy execution of the entire charging process enters a dynamic phase. At this point, obtaining the current voltage of the battery pack is the fundamental basis for all subsequent judgments and controls.

[0046] The vehicle's battery management system integrates high-precision voltage sampling circuits, which are directly or indirectly connected to the positive and negative terminals of the battery pack via isolated measurement units. During charging, the sampling circuits measure the battery pack voltage at a fixed, high frequency (e.g., 10 times per second or higher). The acquired raw voltage signal is then filtered, calibrated, and processed to obtain the current voltage of the battery pack.

[0047] The current voltage of the battery pack is not constant but continuously increases as the charging process progresses. In direct charging mode, because the charging station outputs a constant current, the current voltage of the battery pack gradually increases with changes in its internal electrochemical state (such as increased state of charge, polarization effects, etc.). Continuously acquiring and monitoring the trend of the battery pack's current voltage is a core step in providing input for subsequent critical decisions.

[0048] In step S104 above, if the current voltage of the battery pack meets the preset switching conditions, the vehicle is controlled to switch from direct charging mode to boost charging mode. Specifically, this includes the following steps S1041-S1042: S1041: If the current voltage of the battery pack is greater than or equal to the difference between the maximum allowable voltage of the charging pile and the preset voltage margin, it is determined that the preset switching condition is met.

[0049] Specifically, this step can be considered the core decision point that triggers the charging mode switching in this method. Its purpose is to reserve sufficient operational margin before the current voltage of the battery pack reaches the theoretical limit of the charging pile's output capacity, so as to safely and smoothly initiate the switching process from direct charging mode to boost charging mode, and avoid unexpected charging interruption or equipment protection due to the voltage reaching the hard limit.

[0050] The preset voltage margin is a pre-set safety buffer value, which takes into account various engineering factors. These mainly include: the actual fluctuation range of the charging pile's output voltage, the instantaneous voltage changes that may be caused by the operation of switching devices such as contactors in the vehicle's high-voltage circuit, and the general safety margin required to cope with emergencies.

[0051] Once the current voltage of the battery pack is detected to rise to a level greater than or equal to the difference between the charging pile's maximum allowable voltage and the preset voltage margin, the preset switching condition is determined to be met. This indicates that, driven by the direct charging mode, the current voltage of the battery pack is approaching the boundary where the charging pile can provide continuous and stable power. If the direct charging mode continues, the charging pile will soon be unable to provide a potential difference higher than the battery voltage to maintain a constant current. The charging mode may be forced to enter a constant voltage stage and reduce the current, or it may reach the protection limit, thus failing to achieve the goal of fully charging the battery. Therefore, this determination is a clear signal indicating that subsequent switching steps should be initiated to switch the direct charging mode to the boost charging mode.

[0052] S1042: Control the vehicle to switch from direct charging mode to boost charging mode. Specifically, this includes the following steps S10421-S10425: S10421: Controls the output current of the charging pile to be reduced to the preset minimum current value.

[0053] Specifically, the switching step can be initiated when the preset switching conditions are met in step S1041. First, the current in the charging circuit needs to be significantly reduced to a preset minimum current value.

[0054] The preset minimum current value is an extremely low value set far below the normal charging current. Its purpose is not to transfer energy, but to ensure high-voltage electrical safety.

[0055] Specifically, the vehicle's battery management system sends a significantly reduced current request command to the charging station via standard charging communication messages. Upon receiving this command, the charging station adjusts its internal power module to smoothly reduce the output current to a preset minimum current value.

[0056] The core purpose is to prepare for the subsequent disconnection of the relay in the direct-connection circuit. Direct disconnection with high current can easily generate a strong electric arc between the contacts, which can not only burn the contacts and shorten the relay's lifespan, but also cause voltage spikes, threatening the vehicle's high-voltage system. Therefore, reducing the current beforehand to a level sufficient to suppress arc generation or minimize its harmful effects is a prerequisite for ensuring the safety and reliability of subsequent hardware operations and a crucial safety foundation step in the entire switching process.

[0057] S10422: Disconnect the positive relay in direct charging mode.

[0058] Specifically, once it is confirmed that the output current of the charging pile has stabilized at the preset minimum current value, the operation of disconnecting the charging circuit in the direct charging mode can be performed.

[0059] The positive relay responsible for constructing the direct charging circuit (i.e. Figure 2 The S3 will receive a disconnect command from the vehicle controller. Because the current in the circuit has been pre-reduced to an extremely low safety level, the positive relay will not generate a destructive arc when it disconnects its contacts, thus achieving "arc-free" or "micro-arc" disconnection, maximizing the protection of the relay's electrical life and mechanical integrity.

[0060] The reliable disconnection of the positive relay physically severed the direct connection between the charging pile's positive output terminal and the battery pack's positive terminal via a straight-through path. This means that the original high-power direct-connection charging circuit has been disconnected. However, the charging pile remains connected to the battery pack via the negative relay, outputting extremely low current and a certain voltage. The entire charging system is not completely powered off, but rather enters a transitional phase with extremely low current and controllable state, creating conditions for establishing a new charging path.

[0061] S10423: Controls the output voltage of the charging pile to be adjusted to the preset safe voltage.

[0062] Specifically, it can be that, after the direct charging circuit has been safely disconnected, a suitable initial operating voltage, i.e. a preset safety voltage, needs to be set for the boost charging circuit that is about to be established.

[0063] The preset safety voltage can be determined based on the current voltage of the battery pack and a preset safety factor. That is, the current voltage of the battery pack obtained when the switching is triggered is multiplied by a preset safety factor less than 1 (such as 0.9). The setting of this preset safety factor is intended to ensure that the calculated preset safety voltage is clearly and stably lower than the maximum allowable voltage of the charging pile.

[0064] After determining the preset safe voltage, a new voltage request command is sent to the charging station, requesting it to adjust its output voltage to the preset safe voltage. The charging station adjusts its output according to the command, causing the output voltage to drop from a level close to the charging station's maximum allowable voltage to the preset safe voltage.

[0065] S10424: Controls the vehicle to enter a preset buck mode to connect the boost distribution box to the battery pack, motor inverter and stator windings inside the vehicle.

[0066] Specifically, once the charging pile output voltage stabilizes at a preset safe voltage, the vehicle will perform hardware reuse and circuit reconfiguration operations.

[0067] First, a command is sent to the boost distribution box, which is responsible for managing the coupling between the powertrain and the charging function, to control the closing of the relevant relays inside. The closing of these relays electrically connects the positive output terminal of the charging pile, the boost distribution box, the DC bus port of the motor inverter, and the stator winding of the motor in series, and finally connects to the positive terminal of the battery pack, thus forming a completely new hardware path.

[0068] The charging structure diagram at this time is as follows: Figure 3 As shown, with Figure 2 Similarly, the left side of the image shows the battery pack and its positive and negative terminals, while the right side, from top to bottom, shows the charging socket of the charging station, the external boost distribution box, the motor inverter, and the stator windings. Figure 3 The pathways indicated by the red arrows and those indicated by the blue arrows together form the reconstructed charging circuit. Figure 3 Relays S5, S6, and S7 are the relevant relays inside the aforementioned booster distribution box.

[0069] Next, a mode switching command is sent to the motor controller. Based on this command, the motor controller reconfigures the switching logic of its internal power devices and the electrical connection of the stator windings, switching the entire combination of motor inverter and stator windings from the drive state to the preset buck mode.

[0070] In the preset buck mode, the pre-reduced voltage provided by the charging pile serves as the input to this "buck circuit". The circuit outputs a lower, controlled DC voltage through high-frequency chopping and filtering to maintain a small charging current for the battery pack.

[0071] The purpose of this step is to temporarily establish a controlled, step-down current bridge between the charging station and the battery pack using the vehicle's existing high-power drive components. This not only safely re-establishes the charging energy flow and completes the topology switch of the charging circuit, but also ensures continuous current and stable voltage throughout the entire process, representing the essence of the technology for achieving smooth mode transition.

[0072] S10425: Control the vehicle to enter boost charging mode.

[0073] Specifically, after confirming stable operation in the preset buck mode and that the charging circuit has been reconstructed and is running normally, the final step of the switching process will be executed, switching from the temporary preset buck mode to the boost charging mode.

[0074] A mode switching command is sent to the motor controller. After receiving the command, the motor controller dynamically changes the control algorithm of its internal power devices and the energy transfer path of the stator winding, switching the working mode of the motor inverter & stator winding combination from Buck chopper to Boost chopper, thus completing the switch from the preset buck mode to the boost charging mode.

[0075] In this embodiment of the application, after completing the above step S10425 and controlling the vehicle to enter the boost charging mode, step S10426 is further included, specifically including the following steps S104261-S104263: S104261: Controls the output voltage of the charging pile to maintain a preset safe voltage.

[0076] Specifically, after successfully switching to boost charging mode, the vehicle first needs to stabilize its current state. At this time, the output voltage of the charging station is instructed to be maintained at the preset safe voltage level set in the previous steps. The core purpose of this is to provide a stable and known input voltage environment for the boost charging circuit, which has just started and consists of the motor system.

[0077] The output voltage and power capability of the boost converter box are directly related to its input voltage. Maintaining a stable input voltage helps the control system of the boost converter box converge quickly and optimizes the duty cycle of its internal switching devices, thereby efficiently and smoothly establishing the required boost conversion. If the output voltage of the charging pile is changed immediately at this time, it may cause disturbance to the input of the boost module, affecting its stable operation, and may even cause fluctuations in output voltage or current. Therefore, maintaining a constant input voltage in the initial stage of boost mode is a robust strategy to ensure a smooth system transition and consolidate the new operating mode.

[0078] S104262: Obtain the maximum permissible current of the vehicle.

[0079] Specifically, this could involve calculating in real time the maximum charging current that the vehicle can withstand under the current conditions. This maximum charging current is dynamically determined by multiple factors, including battery status, boost module capability, and the thermal limits of high-voltage components, and serves as a safe current target for resuming high-power charging.

[0080] S104263: Controls the output current of the charging pile to be adjusted to the maximum allowable current of the vehicle.

[0081] Specifically, after determining the vehicle's maximum allowable current, a request can be made to the charging station to increase the output current to that maximum allowable current. From there, in boost charging mode, the system returns to the optimal power charging state under the current conditions until charging is complete.

[0082] Example 2 Based on the same inventive concept, embodiments of the present invention also provide a control device for boost charging, see reference. Figure 4 As shown, the device includes: The first acquisition module 101 is used to acquire the insulation detection voltage of the charging pile and the maximum allowable voltage of the charging pile. The first control module 102 is used to control the vehicle to enter the direct charging mode if the insulation detection voltage of the charging pile and the maximum allowable voltage of the charging pile meet the preset judgment conditions. The second acquisition module 103 is used to acquire the current voltage of the vehicle battery pack in the direct charging mode; The second control module 104 is used to control the vehicle to switch from direct charging mode to boost charging mode if the current voltage of the battery pack meets the preset switching conditions.

[0083] Example 3 Based on the same inventive concept, embodiments of the present invention also provide a computer-readable storage medium storing a computer program / instruction thereon, which, when executed by a processor, implements the boost charging control method described in Embodiment 1 above.

[0084] Example 4 Based on the same inventive concept, embodiments of the present invention also provide a computer program product, including a computer program / instruction, which, when executed by a processor, implements the boost charging control method described in Embodiment 1 above.

[0085] Example 5 Based on the same inventive concept, this embodiment of the invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory. When the processor executes the computer program, it implements the boost charging control method as described in Embodiment 1 above.

[0086] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0087] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0088] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0089] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0090] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A control method for boost charging, characterized in that, include: Obtain the insulation test voltage and maximum allowable voltage of the charging pile; If the insulation detection voltage of the charging pile and the maximum allowable voltage of the charging pile meet the preset judgment conditions, then the vehicle is controlled to enter the direct charging mode. In the direct charging mode, the current voltage of the vehicle battery pack is obtained; If the current voltage of the battery pack meets the preset switching conditions, the vehicle is controlled to switch from direct charging mode to boost charging mode.

2. The method according to claim 1, characterized in that, If the insulation detection voltage of the charging pile and the maximum allowable voltage of the charging pile meet the preset judgment conditions, then the vehicle is controlled to enter the direct charging mode, including: If the insulation detection voltage of the charging pile is greater than the first voltage threshold, the insulation detection voltage of the charging pile is less than or equal to the second voltage threshold, and the maximum allowable voltage of the charging pile is greater than the first voltage threshold, then the preset judgment condition is determined to be met; wherein, the first voltage threshold is less than the second voltage threshold. Control the vehicle to enter direct charging mode.

3. The method according to claim 1, characterized in that, If the current voltage of the battery pack meets the preset switching conditions, then controlling the vehicle to switch from direct charging mode to boost charging mode includes: If the current voltage of the battery pack is greater than or equal to the difference between the maximum allowable voltage of the charging pile and the preset voltage margin, it is determined that the preset switching condition is met. Control the vehicle to switch from direct charging mode to boost charging mode.

4. The method according to claim 3, characterized in that, The control of the vehicle to switch from direct charging mode to boost charging mode includes: Control the output current of the charging pile to reduce it to a preset minimum current value; Disconnect the positive relay in the direct charging mode; Control the output voltage of the charging pile to adjust to a preset safe voltage; The vehicle is controlled to enter a preset buck mode to connect the boost distribution box to the battery pack, motor inverter and stator winding inside the vehicle; Control the vehicle to enter boost charging mode.

5. The method according to claim 4, characterized in that, The preset safety voltage is obtained in the following manner: The preset safety voltage is obtained based on the current voltage of the battery pack and a preset safety factor; wherein the preset safety voltage is less than the maximum allowable voltage of the charging pile.

6. The method according to claim 4, characterized in that, After controlling the vehicle to enter the boost charging mode, the method further includes: The output voltage of the charging pile is controlled to be maintained at the preset safe voltage; Obtain the maximum permissible current of the vehicle; The output current of the charging pile is adjusted to the maximum allowable current of the vehicle.

7. A control device for boost charging, characterized in that, include: The first acquisition module is used to acquire the insulation detection voltage of the charging pile and the maximum allowable voltage of the charging pile. The first control module is used to control the vehicle to enter the direct charging mode if the insulation detection voltage of the charging pile and the maximum allowable voltage of the charging pile meet the preset judgment conditions. The second acquisition module is used to acquire the current voltage of the vehicle battery pack in the direct charging mode; The second control module is used to control the vehicle to switch from direct charging mode to boost charging mode if the current voltage of the battery pack meets the preset switching conditions.

8. A computer-readable storage medium having a computer program / instructions stored thereon, characterized in that, When the computer program / instruction is executed by the processor, it implements the boost charging control method according to any one of claims 1-6.

9. A computer program product comprising a computer program / instructions, characterized in that, The computer program When the sequence / instruction is executed by the processor, it implements the boost charging control method according to any one of claims 1-6.

10. A computer device, comprising a memory, a processor, and a computer program stored in the memory. Its features are, The processor executes the computer program to implement the boost charging control method according to any one of claims 1-6.

Images