Pre-charging control method, device, storage medium, processor and electronic device

Abstract

The present invention discloses a pre-charging control method, device, storage medium, processor and electronic device. The method includes: determining a pre-charging target voltage interval of a pre-charge capacitor, the maximum value of the voltage interval is a first target voltage, and the minimum value of the voltage interval is a second target voltage; in response to the energy storage information of the low-voltage battery satisfying the first preset condition, controlling the DC / DC converter to pre-charge the pre-charge capacitor to the first target voltage; when the voltage of the pre-charge capacitor reaches the first target voltage, judging whether the electric vehicle meets the high-voltage power-on condition; if not, judging whether the current high-voltage side voltage of the DC / DC converter is less than the second target voltage; when the current high-voltage side voltage of the DC / DC converter is less than the second target voltage, controlling the DC / DC converter to continue pre-charging the pre-charge capacitor to the first target voltage. The present invention solves the technical problems of affecting the lightweight of electric vehicles and increasing the failure factors of high-voltage power-on due to the addition of pre-charging components.

Description

Technical Field

[0001] The present invention relates to the field of electric vehicles, and in particular to a pre-charging control method, device, storage medium, processor and electronic device. Background Art

[0002] The starting method of electric vehicles is different from that of traditional fuel vehicles. By controlling the main relay at the output end of the high-voltage battery to attract, the high-voltage power-on and starting of the electric vehicle can be completed. Therefore, the high-voltage power-on function has become an important research topic that affects the functional reliability of the vehicle and the user experience.

[0003] The high-voltage components in the high-voltage system of electric vehicles, such as motor controllers, air-conditioning compressors, on-board chargers and other high-voltage accessories, have microfarad-level bus capacitors connected in parallel between their high-voltage positive and negative lines for voltage stabilization and EMC filtering of high-voltage components. Before the main positive relay and main negative relay of the high-voltage battery of the electric vehicle are attracted, it is usually necessary to use a pre-charge relay and a pre-charge resistor to pre-charge the above bus capacitor to avoid the instantaneous generation of large current when the power battery relay is attracted, which may damage the relay.

[0004] The above technical solution requires the addition of additional pre-charge relays and pre-charge resistors, which increases the cost of the electric vehicle. At the same time, it requires additional space for their arrangement, which increases the size and weight of the high-voltage distribution box in the battery pack, which is not conducive to the lightweighting of the electric vehicle. In addition, if a pre-charge relay or pre-charge resistor is abnormal during the high-voltage power-on process, the high-voltage power-on strategy of the electric vehicle will usually determine that the power-on has failed, requiring the user to re-power on or inform the user through a fault prompt, which greatly affects the user experience. Summary of the invention

[0005] Embodiments of the present invention provide a pre-charging control method, device, storage medium, processor and electronic device to at least solve the technical problems of increasing the weight of electric vehicles due to the addition of pre-charging components and increasing the failure factors of high-voltage power-on.

[0006] According to one aspect of an embodiment of the present invention, a pre-charging control method is provided, comprising: obtaining the output voltage of a high-voltage battery; determining a pre-charging target voltage interval of a pre-charging capacitor based on the output voltage of the high-voltage battery and a voltage detection error, wherein a maximum value of the pre-charging target voltage interval is a first target voltage, and a minimum value of the pre-charging target voltage interval is a second target voltage; obtaining energy storage information of a low-voltage battery, wherein the energy storage information includes an output voltage and a state of charge of the low-voltage battery; in response to the energy storage information of the low-voltage battery satisfying a first preset condition, controlling a DC / DC converter to pre-charge the pre-charging capacitor to a first target voltage; when the voltage of the pre-charging capacitor reaches the first target voltage, determining whether the electric vehicle satisfies a high-voltage power-on condition; if not, determining whether the current high-voltage side voltage of the DC / DC converter is less than a second target voltage; when the current high-voltage side voltage of the DC / DC converter is less than the second target voltage, controlling the DC / DC converter to continue pre-charging the pre-charging capacitor to the first target voltage.

[0007] Optionally, in response to the energy storage information of the low-voltage battery satisfying a first preset condition, controlling the DC / DC converter to pre-charge the pre-charge capacitor to a first target voltage, including: in response to the energy storage information of the low-voltage battery satisfying the first preset condition, controlling the DC / DC converter to pre-charge the pre-charge capacitor with a first preset current; when the high-voltage side voltage of the DC / DC converter is greater than or equal to a third target voltage, controlling the DC / DC converter to pre-charge the pre-charge capacitor with a second preset current, wherein the third target voltage is less than the second target voltage, and the second preset current is greater than the first preset current; when the high-voltage side voltage of the DC / DC converter is greater than or equal to the second target voltage, controlling the DC / DC converter to pre-charge the pre-charge capacitor with a third preset current to the first target voltage, wherein the third preset current is less than the second preset current.

[0008] Optionally, the method also includes: when the DC / DC converter pre-charges the pre-charge capacitor with a first preset current, determining whether the high-voltage side voltage of the DC / DC converter is greater than or equal to a third target voltage; if so, controlling the DC / DC converter to exit the pre-charge working mode.

[0009] Optionally, the method also includes: when the DC / DC converter pre-charges the pre-charge capacitor with a second preset current, determining whether the high-voltage side voltage of the DC / DC converter is greater than or equal to a second target voltage; if so, controlling the DC / DC converter to exit the pre-charge working mode.

[0010] Optionally, the method further includes: before the DC / DC converter pre-charges the pre-charge capacitor, determining whether the energy storage information of the low-voltage battery meets a first preset condition; if not, controlling the DC / DC converter to exit the pre-charge working mode.

[0011] Optionally, the voltage detection error includes a detection error of the high-voltage battery voltage, a detection error of the pre-charge capacitor voltage, and a detection error of the high-voltage side voltage of the DC / DC converter.

[0012] According to another aspect of an embodiment of the present invention, a pre-charging control device is also provided, including: an acquisition module, the acquisition module is used to acquire the output voltage of the high-voltage battery, and based on the output voltage of the high-voltage battery, determine the pre-charging target voltage interval of the pre-charging capacitor, wherein the maximum value of the pre-charging target voltage interval is the first target voltage, and the minimum value of the pre-charging target voltage interval is the second target voltage; and is used to acquire energy storage information of the low-voltage battery, wherein the energy storage information includes the output voltage and the charge state of the low-voltage battery; a first control module, the first control module is used to control the DC / DC converter to pre-charge the pre-charging capacitor to the first target voltage in response to the energy storage information of the low-voltage battery satisfying the first preset condition; a judgment module, the judgment module is used to judge whether the electric vehicle meets the high-voltage power-on condition when the voltage of the pre-charging capacitor reaches the first target voltage; if not, judge whether the high-voltage side voltage of the current DC / DC converter is less than the second target voltage; a second control module, the second control module is used to control the DC / DC converter to continue pre-charging the pre-charging capacitor to the first target voltage when the high-voltage side voltage of the current DC / DC converter is less than the second target voltage.

[0013] According to another aspect of an embodiment of the present invention, a computer storage medium is provided, the computer storage medium including a stored program, wherein when the program is running, the device where the computer storage medium is located is controlled to execute any one of the methods in the above schemes.

[0014] According to another aspect of an embodiment of the present invention, a processor is further provided. The processor is used to run a program. The processor is configured to run a computer program to execute any one of the methods in the above solutions.

[0015] According to another aspect of an embodiment of the present invention, there is provided an electronic device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute any one of the methods in the above solutions.

[0016] In an embodiment of the present invention, the low-voltage electric energy of the low-voltage battery is converted into high-voltage electric energy through a DC / DC converter, and the pre-charge capacitor is pre-charged, which replaces the pre-charge relay or pre-charge resistor, saves the cost and layout space of the electric vehicle, does not affect the lightweight design of the electric vehicle, and does not affect the high-voltage power-on due to abnormal conditions. Before charging the pre-charge capacitor, the energy storage information of the low-voltage battery is judged to avoid the phenomenon that the low-voltage battery cannot provide sufficient pre-charge energy for the pre-charge capacitor due to power loss or undervoltage, thereby causing pre-charge failure. In the process of detecting whether the high-voltage power-on conditions are met, the DC / DC converter repeatedly charges the pre-charge capacitor to the first target voltage to avoid the pre-charge capacitor voltage being discharged and lower than the standard pre-charge target voltage due to the presence of a passive discharge resistor. At the same time, the waiting time for high-voltage power-on related faults can be reduced, and the next process step of high-voltage power-on can be directly entered after the fault is eliminated, which increases the robustness of the electric vehicle pre-charge control strategy and ensures that the user experience is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 is a structural block diagram of an optional pre-charging control method according to an embodiment of the present invention applied to an electronic device of a vehicle;

[0019] Figure 2 It is a structural block diagram of the pre-charging system;

[0020] Figure 3 is a flow chart of an optional pre-charging control method according to an embodiment of the present invention;

[0021] Figure 4 is a flow chart of an optional pre-charging control method according to an embodiment of the present invention;

[0022] Figure 5 It is a structural block diagram of an optional pre-charging control device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] According to an embodiment of the present invention, a pre-charging control method embodiment is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0026] The method embodiment can be executed in an electronic device or similar computing device in a vehicle including a memory and a processor. For example, Figure 1 As shown, the electronic device of the vehicle may include one or more processors 102 (the processor may include but is not limited to a central processing unit (CPU), a graphics processing unit (GPU), a digital signal processing (DSP) chip, a microprocessor (MCU), a field programmable logic device (FPGA), a neural network processor (NPU), a tensor processing unit (TPU), an artificial intelligence (AI) type processor, etc.) and a memory 104 for storing data. Optionally, the electronic device of the above-mentioned car may also include a transmission device 106 for communication functions, an input and output device 108, and a display device 110. It can be understood by those skilled in the art that Figure 1 The structure shown is for illustration only and does not limit the structure of the electronic device of the vehicle. For example, the electronic device of the vehicle may include more or fewer components than those described in the above structure, or may have a configuration different from that described in the above structure.

[0027] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the pre-charging control method in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, to realize the control method of the above-mentioned hydrogen direct injection system. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0028] The transmission device 106 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device can be a radio frequency (Radio Frequency, referred to as RF) module, which is used to communicate with the Internet wirelessly.

[0029] The display device 110 may be, for example, a touch screen type liquid crystal display (LCD) and a touch display (also referred to as a "touch screen" or a "touch display screen"). The liquid crystal display may enable a user to interact with a user interface of the mobile terminal. In some embodiments, the mobile terminal has a graphical user interface (GUI), and a user may interact with the GUI by finger contact and / or gestures on a touch-sensitive surface, wherein the human-computer interaction functions here may optionally include the following interactions: creating web pages, drawing, word processing, making electronic documents, games, video conferencing, instant messaging, sending and receiving emails, call interfaces, playing digital videos, playing digital music and / or web browsing, etc. The executable instructions for executing the above human-computer interaction functions are configured / stored in a computer program product or a readable storage medium executable by one or more processors.

[0030] The embodiment of the present application provides a high-voltage pre-charging system for an electric vehicle. Figure 2 This is the principle block diagram of the high voltage pre-charging system of electric vehicles, such as Figure 2As shown, the system includes: vehicle controller, DC / DC converter, motor controller, high-voltage electrical accessories, high-voltage battery, low-voltage battery, required energy transmission lines and communication lines. The DC / DC converter is composed of a power unit and a control unit, the low-voltage battery is composed of a battery controller and a battery module, and the high-voltage battery is composed of a high-voltage battery management system (BMS) and a battery module. The low-voltage battery can be a lead-acid battery or a lithium battery. The output voltage and state of charge of the lead-acid battery can be collected and estimated by a battery sensor, and the output voltage and state of charge of the lithium battery can be collected and estimated by a low-voltage battery management system.

[0031] Furthermore, the component modules of the high-voltage pre-charging system of the electric vehicle are described in detail.

[0032] The vehicle controller monitors the status of electric vehicles under various working conditions and the failure of various components in real time, and controls the vehicle's high voltage power on and off according to the vehicle status and component failure type. The vehicle controller communicates with the DC / DC converter, motor controller, high-voltage battery management system (BMS), and battery controller in real time, and controls the DC / DC converter to turn on or off the pre-charge function.

[0033] The motor controller converts the high-voltage DC power of the high-voltage battery into the three-phase AC power required by the motor to provide driving force for the electric vehicle. A microfarad bus capacitor is connected in parallel between the high-voltage positive and negative lines inside the motor controller for voltage stabilization and EMC filtering. The voltage of the bus capacitor can be uploaded to the vehicle communication line in real time.

[0034] High-voltage electrical accessories include air-conditioning compressors, on-board chargers, battery heaters, etc. A microfarad bus capacitor is connected in parallel between the high-voltage positive and negative lines inside the high-voltage electrical accessories for voltage stabilization and EMC filtering. The bus capacitor of the high-voltage electrical accessories and the bus capacitor of the motor controller together constitute the bus capacitor of the high-voltage pre-charging system of electric vehicles, i.e., the pre-charging capacitor.

[0035] The battery module inside the high-voltage battery is used to store energy or provide energy for electric vehicles. The high-voltage battery management system (BMS) can collect the battery voltage in real time, and the battery voltage can be uploaded to the vehicle communication line in real time.

[0036] The battery module inside the low-voltage battery is used to store energy or power the low-voltage controller of the battery vehicle. The battery controller inside the low-voltage battery is used to collect the battery voltage and charge status, which can be uploaded to the vehicle communication line in real time.

[0037] The DC / DC converter communicates with the vehicle controller, motor controller, and battery controller. During the high-voltage power-on process of the electric vehicle, the DC / DC converter converts the low-voltage DC voltage of the low-voltage battery into a high-voltage DC voltage to pre-charge the bus capacitor. The power unit of the DC / DC converter is composed of a certain number of switch tubes according to the corresponding circuit topology principle, which is used to realize the function of converting low-voltage DC voltage into high-voltage DC voltage. The control unit of the DC / DC converter is composed of a control chip and related matching circuits. According to the signals uploaded in real time by the vehicle controller, motor controller, high-voltage battery management system (BMS), and battery sensor, the corresponding instructions are sent according to a certain logical sequence to control the power unit to turn on or off.

[0038] The embodiment of the present application also provides a control method for operating the above-mentioned pre-charging, Figure 3 is a flow chart of a pre-charging control method according to one embodiment of the present invention. Figure 3 As shown, the process includes the following steps:

[0039] Step S1: Obtain the output voltage of the high-voltage battery, and determine the pre-charge target voltage interval of the pre-charge capacitor based on the output voltage of the high-voltage battery and the voltage detection error, wherein the maximum value of the pre-charge target voltage interval is the first target voltage, and the minimum value of the pre-charge target voltage interval is the second target voltage. Obtain the energy storage information of the low-voltage battery, wherein the energy storage information includes the output voltage and the state of charge of the low-voltage battery. Step S2: In response to the energy storage information of the low-voltage battery meeting the first preset condition, control the DC / DC converter to pre-charge the pre-charge capacitor to the first target voltage. Step S3: When the voltage of the pre-charge capacitor reaches the first target voltage, determine whether the electric vehicle meets the high-voltage power-on condition. If not, determine whether the high-voltage side voltage of the current DC / DC converter is less than the second target voltage. Step S4: When the high-voltage side voltage of the current DC / DC converter is less than the second target voltage, control the DC / DC converter to continue pre-charging the pre-charge capacitor to the first target voltage. Among them, the first preset condition is that the output voltage of the low-voltage battery is greater than the preset voltage, and the state of charge of the low-voltage battery is greater than the preset state of charge, so as to ensure that sufficient pre-charge energy is provided for the pre-charge capacitor. The standard pre-charge target voltage is within the pre-charge target voltage interval, the standard pre-charge target voltage is greater than the second target voltage, and the standard pre-charge target voltage is less than the first target voltage.

[0040] In this embodiment, the low-voltage electric energy of the low-voltage battery is converted into high-voltage electric energy through a DC / DC converter, and the pre-charge capacitor is pre-charged, which replaces the pre-charge relay or pre-charge resistor, saves the cost and layout space of the electric vehicle, does not affect the lightweight design of the electric vehicle, and does not affect the high-voltage power-on due to abnormal conditions. Before charging the pre-charge capacitor, the energy storage information of the low-voltage battery is judged to avoid the phenomenon that the low-voltage battery cannot provide sufficient pre-charge energy for the pre-charge capacitor due to power loss or undervoltage, thereby causing pre-charge failure. In the process of detecting whether the high-voltage power-on conditions are met, the DC / DC converter repeatedly charges the pre-charge capacitor to the first target voltage to avoid the pre-charge capacitor voltage being discharged and lower than the standard pre-charge target voltage due to the presence of a passive discharge resistor. At the same time, the waiting time for high-voltage power-on related faults can be reduced. After the fault is eliminated, the next process step of high-voltage power-on can be directly entered, which increases the robustness of the electric vehicle pre-charge control strategy and ensures that the user experience is not affected.

[0041] Optionally, in step S2, in response to the energy storage information of the low-voltage battery satisfying the first preset condition, the DC / DC converter is controlled to pre-charge the pre-charge capacitor to the first target voltage, including the following specific steps: in response to the energy storage information of the low-voltage battery satisfying the first preset condition, the DC / DC converter is controlled to pre-charge the pre-charge capacitor with a first preset current. When the high-voltage side voltage of the DC / DC converter is greater than or equal to the third target voltage, the DC / DC converter is controlled to pre-charge the pre-charge capacitor with a second preset current, wherein the third target voltage is less than the second target voltage, and the second preset current is greater than the first preset current. When the high-voltage side voltage of the DC / DC converter is greater than or equal to the second target voltage, the DC / DC converter is controlled to pre-charge the pre-charge capacitor with a third preset current to the first target voltage, wherein the third preset current is less than the second preset current. Wherein, the DC / DC converter is connected in parallel with the pre-charge capacitor, and the high-voltage side voltage of the DC / DC converter is equal to the voltage of the pre-charge capacitor.

[0042] In the above steps, the output current of the DC / DC converter is controlled according to the high-voltage side voltage of the DC / DC converter or the voltage of the pre-charge capacitor. Specifically, the DC / DC converter pre-charges the pre-charge capacitor with a smaller first preset current in the initial pre-charge stage, the DC / DC converter pre-charges the pre-charge capacitor with a larger second preset current to below the standard pre-charge target voltage in the middle pre-charge stage, and the DC / DC converter pre-charges the pre-charge capacitor with a smaller third preset current to above the standard pre-charge target voltage in the final pre-charge stage. The DC / DC converter outputs current in a soft-start mode to avoid damage to the power module inside the DC / DC converter.

[0043] Optionally, when the DC / DC converter pre-charges the pre-charge capacitor with a first preset current, it is determined whether the high-voltage side voltage of the DC / DC converter is greater than or equal to a third target voltage. If so, the DC / DC converter is controlled to exit the pre-charge working mode. The output circuit of the DC / DC converter is matched with the output voltage of the DC / DC converter to avoid damage to the power module inside the DC / DC converter, thereby causing pre-charge failure.

[0044] Optionally, when the DC / DC converter pre-charges the pre-charge capacitor with a second preset current, it is determined whether the high-voltage side voltage of the DC / DC converter is greater than or equal to the second target voltage. If so, the DC / DC converter is controlled to exit the pre-charge working mode. The output circuit of the DC / DC converter is matched with the output voltage of the DC / DC converter to avoid damage to the power module inside the DC / DC converter, thereby causing pre-charge failure.

[0045] Optionally, before the DC / DC converter pre-charges the pre-charge capacitor, it is determined whether the energy storage information of the low-voltage battery meets the first preset condition. If not, the DC / DC converter is controlled to exit the pre-charge working mode. In the case that the energy storage information of the low-voltage battery does not meet the first preset condition, pre-charging the pre-charge capacitor is prohibited to avoid pre-charging failure due to insufficient energy.

[0046] Optionally, the voltage detection error mentioned in step S1 includes: a detection error of the high-voltage battery voltage, a detection error of the pre-charge capacitor voltage, and a detection error of the high-voltage side voltage of the DC / DC converter. Specifically, the standard pre-charge target voltage V of the pre-charge capacitor is determined based on the output voltage of the high-voltage battery. targert , based on the voltage detection error, determine the voltage bias V x , the pre-charge target voltage range is determined as [V targert -V x ,V targert +V x ].

[0047] Figure 4 is a logic diagram of a pre-charging control method according to one optional embodiment of the present application, such as Figure 4 As shown, the following execution steps are included:

[0048] Step 10: After the vehicle controller receives the high-voltage power-on command, it sets the bus capacitor pre-charge target voltage value V according to the high-voltage battery voltage collected by the BMS. target .

[0049] Step 20: The vehicle controller sends the pre-charge enable and bus capacitor pre-charge target voltage value V to the DC / DC converter. target .

[0050] Step 30: The DC / DC converter enters the pre-charge working mode.

[0051] Step 40: The DC / DC converter control module monitors the voltage and SOC reported by the low-voltage battery controller in real time. If the low-voltage battery voltage is greater than the preset value V LV If the SOC is greater than the preset value X%, then execute step 50. Otherwise, execute step 100.

[0052] Step 50: The DC / DC converter charges the bus capacitor to a preset voltage value V1 with a smaller preset current value I1. If the DC / DC converter control module detects that the high-voltage side voltage is greater than or equal to V1, step 60 is executed. Otherwise, step 100 is executed.

[0053] Step 60: The DC / DC converter charges the bus capacitor to a preset voltage value V2 with a larger preset current value I2, where V2 = V targert -V x If the DC / DC converter control module detects that the high-voltage side voltage is greater than or equal to V2, then execute step 7. Otherwise, execute step 100.

[0054] Step 70: The DC / DC converter charges the bus capacitor to a preset voltage value V3 with a smaller preset current value I3, where V3 = V targert +V x .

[0055] Step 80: The vehicle controller determines in real time whether the high voltage power-on condition is met, and if so, executes step 10. Otherwise, executes step 90.

[0056] Step 90: The DC / DC converter is continuously in the pre-charging working mode. If the high-voltage side voltage is detected to be less than V2 during the waiting process, the bus capacitor continues to be charged to V3 with the preset current I3.

[0057] Step 100: The DC / DC converter exits the pre-charge working mode.

[0058] The embodiment of the present application also provides a pre-charging control device, Figure 5 It is the structural block diagram of the pre-charging control device, such as Figure 5As shown, the device includes: an acquisition module 51, a first control module 52, a judgment module 53 and a second control module 54. The acquisition module 51 is used to acquire the output voltage of the high-voltage battery, determine the pre-charge target voltage interval of the pre-charge capacitor based on the output voltage of the high-voltage battery, wherein the maximum value of the pre-charge target voltage interval is the first target voltage, and the minimum value of the pre-charge target voltage interval is the second target voltage, and to acquire the energy storage information of the low-voltage battery, wherein the energy storage information includes the output voltage and the state of charge of the low-voltage battery. The first control module 52 is used to control the DC / DC converter to pre-charge the pre-charge capacitor to the first target voltage in response to the energy storage information of the low-voltage battery meeting the first preset condition. The judgment module 53 is used to determine whether the electric vehicle meets the high-voltage power-on condition when the voltage of the pre-charge capacitor reaches the first target voltage; if not, determine whether the high-voltage side voltage of the current DC / DC converter is less than the second target voltage. The second control module 54 is used to control the DC / DC converter to continue pre-charging the pre-charge capacitor to the first target voltage when the high-voltage side voltage of the current DC / DC converter is less than the second target voltage.

[0059] The embodiment of the present application also provides a storage medium, in which a computer program is stored, wherein the computer program is configured to execute the steps in any of the above method embodiments when running. Optionally, in this embodiment, the above storage medium can be configured to store a computer program for executing the following steps: Step S1: Obtain the output voltage of the high-voltage battery, and determine the pre-charge target voltage interval of the pre-charge capacitor based on the output voltage of the high-voltage battery and the voltage detection error, wherein the maximum value of the pre-charge target voltage interval is the first target voltage, and the minimum value of the pre-charge target voltage interval is the second target voltage. Obtain the energy storage information of the low-voltage battery, wherein the energy storage information includes the output voltage and the state of charge of the low-voltage battery. Step S2: In response to the energy storage information of the low-voltage battery meeting the first preset condition, control the DC / DC converter to pre-charge the pre-charge capacitor to the first target voltage. Step S3: When the voltage of the pre-charge capacitor reaches the first target voltage, determine whether the electric vehicle meets the high-voltage power-on condition. If not, determine whether the high-voltage side voltage of the current DC / DC converter is less than the second target voltage. Step S4: when the current high-side voltage of the DC / DC converter is less than the second target voltage, control the DC / DC converter to continue precharging the pre-charge capacitor to the first target voltage.

[0060] The embodiment of the present application also provides a processor, which is configured to run a computer program to perform the steps in any of the above method embodiments. Optionally, in this embodiment, the above processor can be configured to perform the following steps through a computer program: Step S1: Obtain the output voltage of the high-voltage battery, and determine the pre-charge target voltage interval of the pre-charge capacitor based on the output voltage of the high-voltage battery and the voltage detection error, wherein the maximum value of the pre-charge target voltage interval is the first target voltage, and the minimum value of the pre-charge target voltage interval is the second target voltage. Obtain the energy storage information of the low-voltage battery, wherein the energy storage information includes the output voltage and the state of charge of the low-voltage battery. Step S2: In response to the energy storage information of the low-voltage battery meeting the first preset condition, control the DC / DC converter to pre-charge the pre-charge capacitor to the first target voltage. Step S3: When the voltage of the pre-charge capacitor reaches the first target voltage, determine whether the electric vehicle meets the high-voltage power-on condition. If not, determine whether the high-voltage side voltage of the current DC / DC converter is less than the second target voltage. Step S4: When the high-voltage side voltage of the current DC / DC converter is less than the second target voltage, control the DC / DC converter to continue pre-charging the pre-charge capacitor to the first target voltage.

[0061] The embodiment of the present application also provides an electronic device, including a memory and a processor, characterized in that a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any of the above method embodiments. Optionally, in this embodiment, the above processor can be configured to perform the following steps through a computer program: Step S1: Obtain the output voltage of the high-voltage battery, and determine the pre-charge target voltage interval of the pre-charge capacitor based on the output voltage of the high-voltage battery and the voltage detection error, wherein the maximum value of the pre-charge target voltage interval is the first target voltage, and the minimum value of the pre-charge target voltage interval is the second target voltage. Obtain the energy storage information of the low-voltage battery, wherein the energy storage information includes the output voltage and charge state of the low-voltage battery. Step S2: In response to the energy storage information of the low-voltage battery meeting the first preset condition, control the DC / DC converter to pre-charge the pre-charge capacitor to the first target voltage. Step S3: When the voltage of the pre-charge capacitor reaches the first target voltage, determine whether the electric vehicle meets the high-voltage power-on condition. If not, determine whether the high-voltage side voltage of the current DC / DC converter is less than the second target voltage. Step S4: when the current high-side voltage of the DC / DC converter is less than the second target voltage, control the DC / DC converter to continue precharging the pre-charge capacitor to the first target voltage.

[0062] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0063] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0064] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0065] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0066] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0067] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0068] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A pre-charging control method, characterized in that: The method comprises: Get the output voltage of the high voltage battery; Determine a pre-charge target voltage interval of the pre-charge capacitor based on the output voltage of the high-voltage battery and the voltage detection error, wherein a maximum value of the pre-charge target voltage interval is a first target voltage, and a minimum value of the pre-charge target voltage interval is a second target voltage; Acquire energy storage information of the low-voltage battery, wherein the energy storage information includes the output voltage and charge state of the low-voltage battery; In response to the energy storage information of the low-voltage battery satisfying a first preset condition, controlling the DC / DC converter to pre-charge the pre-charge capacitor to a first target voltage; When the voltage of the pre-charge capacitor reaches the first target voltage, determining whether the electric vehicle meets the high-voltage power-on condition; if not, determining whether the current high-voltage side voltage of the DC / DC converter is less than the second target voltage; When the current high-side voltage of the DC / DC converter is less than the second target voltage, controlling the DC / DC converter to continue precharging the precharge capacitor to the first target voltage; In response to the energy storage information of the low-voltage battery satisfying a first preset condition, controlling the DC / DC converter to pre-charge the pre-charge capacitor to a first target voltage, comprising: In response to the energy storage information of the low-voltage battery satisfying a first preset condition, controlling the DC / DC converter to pre-charge the pre-charge capacitor with a first preset current; When the high-side voltage of the DC / DC converter is greater than or equal to a third target voltage, controlling the DC / DC converter to pre-charge the pre-charge capacitor with a second preset current, wherein the third target voltage is less than the second target voltage, and the second preset current is greater than the first preset current; When the high-side voltage of the DC / DC converter is greater than or equal to the second target voltage, the DC / DC converter is controlled to pre-charge the pre-charge capacitor to the first target voltage with a third preset current, wherein the third preset current is less than the second preset current.

2. The method according to claim 1, characterized in that The method further comprises: When the DC / DC converter pre-charges the pre-charge capacitor with a first preset current, determining whether the high-voltage side voltage of the DC / DC converter is greater than or equal to a third target voltage; If yes, the DC / DC converter is controlled to exit the pre-charge working mode.

3. The method according to claim 1, characterized in that The method further comprises: When the DC / DC converter pre-charges the pre-charge capacitor with a second preset current, determining whether the high-voltage side voltage of the DC / DC converter is greater than or equal to the second target voltage; If yes, the DC / DC converter is controlled to exit the pre-charge working mode.

4. The method according to claim 1, characterized in that: The method further comprises: Before the DC / DC converter pre-charges the pre-charge capacitor, determining whether the energy storage information of the low-voltage battery meets a first preset condition; If not, the DC / DC converter is controlled to exit the pre-charge working mode.

5. The method according to claim 1, characterized in that The voltage detection error includes a detection error of the high-voltage battery voltage, a detection error of the pre-charge capacitor voltage, and a detection error of the high-voltage side voltage of the DC / DC converter.

6. A pre-charging control device, characterized in that: include: an acquisition module, the acquisition module being used to acquire the output voltage of the high-voltage battery, and determine the pre-charge target voltage interval of the pre-charge capacitor based on the output voltage of the high-voltage battery, wherein the maximum value of the pre-charge target voltage interval is the first target voltage, and the minimum value of the pre-charge target voltage interval is the second target voltage; and to acquire energy storage information of the low-voltage battery, wherein the energy storage information includes the output voltage and the state of charge of the low-voltage battery; A first control module, the first control module is used to control the DC / DC converter to pre-charge the pre-charge capacitor to a first target voltage in response to the energy storage information of the low-voltage battery meeting a first preset condition; A judgment module, the judgment module is used to judge whether the electric vehicle meets the high-voltage power-on condition when the voltage of the pre-charge capacitor reaches the first target voltage; if not, judge whether the current high-voltage side voltage of the DC / DC converter is less than the second target voltage; A second control module, wherein the second control module is used to control the DC / DC converter to continue precharging the precharge capacitor to the first target voltage when the current high-voltage side voltage of the DC / DC converter is less than the second target voltage; In response to the energy storage information of the low-voltage battery satisfying a first preset condition, controlling the DC / DC converter to pre-charge the pre-charge capacitor to a first target voltage, comprising: In response to the energy storage information of the low-voltage battery satisfying a first preset condition, controlling the DC / DC converter to pre-charge the pre-charge capacitor with a first preset current; When the high-side voltage of the DC / DC converter is greater than or equal to a third target voltage, controlling the DC / DC converter to pre-charge the pre-charge capacitor with a second preset current, wherein the third target voltage is less than the second target voltage, and the second preset current is greater than the first preset current; When the high-side voltage of the DC / DC converter is greater than or equal to the second target voltage, the DC / DC converter is controlled to pre-charge the pre-charge capacitor to the first target voltage with a third preset current, wherein the third preset current is less than the second preset current.

7. A computer storage medium, characterized in that: The computer storage medium includes a stored program, wherein when the program is executed, the device where the computer storage medium is located is controlled to execute the method according to any one of claims 1 to 5.

8. A processor, characterized in that: The processor is used to run a program, and the processor is configured to run a computer program to execute the method according to any one of claims 1 to 5.

9. An electronic device comprising a memory and a processor, characterized in that: A computer program is stored in the memory, and the processor is configured to run the computer program to perform the method according to any one of claims 1 to 5.

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