New energy vehicle high-voltage pre-charging control method, system and equipment

Abstract

The invention discloses a new energy vehicle high-voltage pre-charging control method, system and device, and relates to the field of vehicle high-voltage pre-charging, and the method comprises the steps: employing an all-in-one controller to connect with a low-voltage storage battery, and the all-in-one controller comprises a motor controller MCU and a DC-DC converter DCDC; the VCU controls a low-voltage storage battery to be boosted to a pre-charging target voltage through the all-in-one controller, and a first capacitor C1 of a motor controller MCU in the all-in-one controller is pre-charged through the low-voltage storage battery; and when the voltage of the first capacitor C1 reaches the pre-charging target voltage of a preset percentage within the pre-charging time, the pre-charging is successful. The low-voltage storage battery is adopted for pre-charging the first capacitor C1 of the MCU in the all-in-one controller, the risk that a pre-charging resistor R1 in a pre-charging branch is heated and fails during pre-charging is avoided, and the high-voltage safety of the whole vehicle is improved.

Description

Technical Field

[0001] The present application relates to the field of high-voltage pre-charging of vehicles, and specifically to a method, system and device for controlling high-voltage pre-charging of new energy vehicles. Background Art

[0002] At present, the architecture commonly used for high-voltage pre-charging of new energy vehicles is as follows: Figure 1 As shown, the power battery includes a pre-charging branch consisting of a pre-charging resistor R1 and a pre-charging relay K3. The corresponding pre-charging control method is: close the main negative relay K1 and the pre-charging relay K3, and the power battery pre-charges the first capacitor C1 of the vehicle MCU (Motor Control Unit) through the pre-charging branch. The BMS (Battery Management System) in the power battery determines whether the pre-charging of the first capacitor C1 voltage is completed by detecting the rear end voltage of the pre-charging relay. After charging is completed, the pre-charging relay K3 is disconnected, the main negative relay K1 and the main positive relay K2 are closed, and the power battery realizes power supply during vehicle driving.

[0003] However, when pre-charging is performed through the pre-charging branch of the power battery, the current value is fixed, and the pre-charging resistor R1 generates severe heat during pre-charging, and there is a risk of the pre-charging resistor R1 failing due to heat, thereby affecting the high-voltage safety of the entire vehicle. Summary of the invention

[0004] The present application provides a new energy vehicle high-voltage pre-charging control method, system and device, which can solve the technical problem in the prior art that when the power battery pre-charges the first capacitor C1 of the vehicle MCU through the pre-charging branch, the high-voltage safety of the whole vehicle is affected.

[0005] In a first aspect, an embodiment of the present application provides a method for controlling high-voltage pre-charging of a new energy vehicle, the method comprising the steps of:

[0006] An all-in-one controller is used to connect the low-voltage battery, wherein the all-in-one controller includes a motor controller MCU and a DC-DC converter DCDC;

[0007] The vehicle controller VCU controls the low-voltage battery to boost the voltage to the pre-charge target voltage through the all-in-one controller, and pre-charges the first capacitor C1 of the motor controller MCU in the all-in-one controller through the low-voltage battery;

[0008] When the voltage of the first capacitor C1 reaches a preset percentage of the pre-charge target voltage within the pre-charge time, the pre-charge is successful.

[0009] In combination with the first aspect, in one implementation, before the vehicle controller VCU controls the low-voltage battery to boost to the pre-charge target voltage through the all-in-one controller, it also includes:

[0010] After the vehicle controller VCU detects the user's action of starting the vehicle, it determines whether the vehicle meets the starting conditions. If so, the vehicle controller VCU sends a pre-charging instruction to the all-in-one controller; if not, the vehicle does not start.

[0011] In combination with the first aspect, in one implementation, the precharge instruction includes a precharge enable signal, a precharge target voltage, and a precharge target current.

[0012] In combination with the first aspect, in one implementation, the vehicle controller VCU controls the low-voltage battery to boost the voltage to the pre-charge target voltage through an all-in-one controller, including:

[0013] After receiving the enable signal, the all-in-one controller determines whether the low-voltage battery voltage meets the normal working voltage of the all-in-one controller. If so, the low-voltage battery is controlled to be boosted to the target voltage according to the pre-charge target current.

[0014] In combination with the first aspect, in one implementation, when the voltage of the first capacitor C1 reaches a preset percentage of the pre-charge target voltage within the pre-charge time, the method includes:

[0015] The all-in-one controller detects the voltage of the first capacitor C1 and compares it with the pre-charge target voltage. When the first capacitor C1 reaches a preset percentage of the pre-charge target voltage within the pre-charge time, the all-in-one controller feeds back to the vehicle controller VCU that the pre-charge is successful; otherwise, the all-in-one controller feeds back to the vehicle controller VCU that the pre-charge is unsuccessful.

[0016] In combination with the first aspect, in one embodiment, after pre-charging is successful, the vehicle controller VCU sends a high-voltage instruction to the battery management system BMS of the power battery. If the high-voltage completion signal is received from the battery management system BMS within a preset time, the vehicle controller VCU sends a work enable signal to the all-in-one controller, and the all-in-one controller converts the high voltage of the power battery into a low voltage and charges the low-voltage battery.

[0017] In a second aspect, the application embodiment provides a control system based on any of the above-mentioned new energy vehicle high-voltage pre-charging control methods, the control system comprising:

[0018] An all-in-one controller, which includes a motor controller MCU and a DC-DC converter DCDC, and the all-in-one controller is connected to a vehicle controller VCU to control the voltage boost of a low-voltage battery;

[0019] A low-voltage battery is connected to the all-in-one controller and is used to boost the voltage to a pre-charge target voltage to pre-charge the first capacitor C1 of the motor controller MCU in the all-in-one controller; when the voltage of the first capacitor C1 reaches a preset percentage of the pre-charge target voltage within the pre-charge time, the pre-charge is successful.

[0020] In conjunction with the second aspect, in one implementation, the method further includes:

[0021] A power battery is connected to the all-in-one controller and the vehicle controller VCU respectively. The power battery includes a positive relay K2 and a negative relay K1. The power battery is used to receive a high-voltage instruction from the vehicle controller VCU after the first capacitor C1 is pre-charged successfully, close the positive relay K2 and the negative relay K1 to increase the high voltage, and then feedback a relay closing state signal; the power battery is also used to convert the high voltage into a low voltage under the control of the all-in-one controller to charge the low-voltage battery.

[0022] In combination with the second aspect, in one embodiment, the all-in-one controller is also used to determine whether the low-voltage battery voltage meets the normal operating voltage of the all-in-one controller after receiving an enable signal sent by the vehicle controller VCU. If so, the low-voltage battery is controlled to boost to the pre-charge target voltage.

[0023] In the third aspect, an embodiment of the present application provides a new energy vehicle high-voltage pre-charging control device, characterized in that the new energy vehicle high-voltage pre-charging control device includes a processor, a memory, and a new energy vehicle high-voltage pre-charging control program stored in the memory and executable by the processor, wherein when the new energy vehicle high-voltage pre-charging control program is executed by the processor, the steps of the new energy vehicle high-voltage pre-charging control method as described in any one of claims 1 to 6 are implemented.

[0024] The beneficial effects brought by the technical solution provided by the embodiments of the present application include:

[0025] An all-in-one controller is used, which includes a motor controller MCU and a DCDC (DC-to-DC converter); the VCU (Vehicle Control Unit) controls the low-voltage battery to boost to the pre-charge target voltage through the all-in-one controller, and uses the low-voltage battery to pre-charge the first capacitor C1 of the MCU in the all-in-one controller, avoiding the use of a power battery to charge the first capacitor C1. There is no need to set a pre-charging branch in the power battery, avoiding the risk of heat failure of the pre-charging resistor R1 in the pre-charging branch during pre-charging, and improving the high-voltage safety of the whole vehicle. At the same time, there is no need to set a pre-charging branch in the power battery, reducing the cost of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the architecture used for high voltage pre-charging in the background technology;

[0027] Figure 2 This is a flow chart of a high-voltage pre-charging control method for a new energy vehicle according to an embodiment of the present application;

[0028] Figure 3 This is a schematic diagram of the process after successful pre-charging in the embodiment of the present application;

[0029] Figure 4 This is a schematic diagram of a high-voltage pre-charging control system for a new energy vehicle according to an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] First, some technical terms in the present application are explained to facilitate those skilled in the art to understand the present application.

[0032] VCU: Vehicle Controller is the core controller of new energy vehicles, responsible for monitoring and managing various key functions of the vehicle. VCU communicates with various subsystems of the vehicle through the vehicle bus or hard wire to control and manage the battery system, electric drive system, thermal management system, etc.

[0033] MCU: In electric vehicles, the function of the motor controller is to convert the electrical energy stored in the power battery into the electrical energy required to drive the motor according to instructions such as gear position, throttle, and brake, to control the starting, running, forward and backward speed, climbing intensity and other driving conditions of the electric vehicle, or to help the electric vehicle brake and store part of the braking energy in the power battery. It is one of the key components of electric vehicles.

[0034] DCDC: It is a circuit or electromechanical device for power conversion, which can convert direct current (DC) power into direct current (or near direct current) power of different voltages, ranging from very small (small battery) to very large (high voltage power conversion).

[0035] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0036] In the first aspect, the embodiment of the present application provides a new energy vehicle high voltage pre-charging control method, which can be used in Figure 4 In the illustrated architecture, the control method comprises the steps of:

[0037] An all-in-one controller is used to connect the low-voltage battery. The all-in-one controller includes a motor controller MCU and a DC-DC converter DCDC.

[0038] The vehicle controller VCU controls the low-voltage battery to boost the voltage to the pre-charge target voltage through the all-in-one controller, and pre-charges the first capacitor C1 of the MCU in the all-in-one controller through the low-voltage battery.

[0039] When the voltage of the first capacitor C1 reaches a preset percentage of the pre-charge target voltage within the pre-charge time, the pre-charge is successful.

[0040] Specifically, the all-in-one controller may be an integration of two controllers or more than two controllers; when it is a two-in-one controller, it only has an MCU and a DCDC.

[0041] In this embodiment, by adopting an all-in-one controller, when the vehicle needs high-voltage pre-charging, the low-voltage battery is boosted to the pre-charging target voltage through the DCDC in the all-in-one controller, and the first capacitor C1 of the MCU in the all-in-one controller is pre-charged at the same time, and the pre-charging target voltage here can be set to the power battery voltage. Compared with the prior art of pre-charging the first capacitor C1 with a power battery, pre-charging the first capacitor C1 with a low-voltage battery avoids the use of a pre-charging branch, avoids the resistance aging caused by the heat of the pre-charging resistor in the pre-charging branch, and further improves the high-voltage safety.

[0042] In addition, the pre-charging group, pre-charging relay and related high-voltage connecting lines can be eliminated inside the power battery, and the BMS of the power battery can cancel the related strategies of pre-charging control, which can reduce the cost of the power battery. After actual calculation, the cost can be reduced by about 300 yuan.

[0043] Furthermore, in one embodiment, before the VCU controls the low-voltage battery to be boosted to the pre-charge target voltage through the all-in-one controller, it also includes:

[0044] After the VCU detects the user's action of starting the vehicle, it determines whether the vehicle meets the starting conditions. If yes, the VCU sends a pre-charge instruction to the all-in-one controller; if not, the VCU terminates the vehicle start process and the vehicle does not start. The pre-charge instruction includes a pre-charge enable signal, a pre-charge target voltage, and a pre-charge target current. The pre-charge target voltage and pre-charge target current can be set according to actual conditions.

[0045] Further, in one embodiment, the VCU controls the low-voltage battery to be boosted to the pre-charge target voltage through the all-in-one controller, specifically including:

[0046] After receiving the enable signal, the all-in-one controller determines whether the low-voltage battery voltage meets the normal working voltage of the all-in-one controller. If so, the low-voltage battery is controlled to be boosted to the pre-charge target voltage according to the pre-charge target current; if not, the pre-charge fault is fed back to the VCU.

[0047] In this embodiment, when the pre-charging target voltage and the first capacitor C1 are constant, the larger the pre-charging target current is, the shorter the pre-charging time is. Therefore, the pre-charging time requirement of the whole vehicle and the performance of the all-in-one controller are used to adaptively adjust the target current to achieve controllable pre-charging process and improve pre-charging performance and pre-charging safety.

[0048] In one embodiment, referring to Figure 2 , Figure 2 This is a flow chart of a more specific embodiment of the high voltage pre-charging control method for new energy vehicles of this application. Figure 2 As shown, this embodiment includes the following steps:

[0049] S101: The VCU detects the user's action of starting the vehicle.

[0050] S102: Determine whether the vehicle meets the starting conditions. If yes, proceed to S103; if not, proceed to S104.

[0051] S103: The VCU sends a pre-charge instruction to the all-in-one controller. The pre-charge instruction includes a pre-charge enable signal, a pre-charge target voltage, and a pre-charge target current. At the same time, the BMS of the power battery continuously sends the total voltage of the power battery to the VCU, and enters S105.

[0052] S104: The vehicle does not start and this process ends.

[0053] S105: The all-in-one controller determines whether an enable signal is received, and if so, proceeds to S106; if not, returns to S105.

[0054] S106: The all-in-one controller determines whether the low-voltage battery voltage meets the normal working voltage of the all-in-one controller, if yes, proceed to S107; if no, proceed to S108. In this embodiment, it is determined whether the low-voltage battery voltage is greater than 10V.

[0055] S107: Entering the pre-charging working mode, boosting the low-voltage battery voltage to the pre-charging target voltage according to the pre-charging target current, and entering S109.

[0056] S108: The all-in-one controller feeds back a pre-charging fault to the VCU, and this process ends.

[0057] S109: the all-in-one controller detects the voltage of the first capacitor C1 and compares it with the pre-charge target voltage to determine whether the first capacitor C1 reaches a preset percentage of the pre-charge target voltage, if yes, proceed to S110; if no, proceed to S111. In this embodiment, the preset percentage is 95%.

[0058] S110: The all-in-one controller stops boosting the low-voltage battery and sends a feedback to the VCU indicating that the pre-charging is successful. This process ends.

[0059] S111: The all-in-one controller determines whether the pre-charging time has been exceeded, if yes, it proceeds to S112; if no, it proceeds to S109. The pre-charging time can be set according to different vehicle models. In this embodiment, the pre-charging time is 500ms.

[0060] S112: Pre-charging fails, and the all-in-one controller feeds back the pre-charging failure status to the VCU.

[0061] High-voltage pre-charging control method for new energy vehicles.

[0062] Furthermore, in one embodiment, after the VCU sends a pre-charging instruction to the all-in-one controller, the VCU continues to receive feedback signals from the all-in-one controller. After the pre-charging is successful, the VCU sends a high-voltage instruction to the BMS of the power battery. If the high-voltage completion signal from the BMS is received within a preset time, the VCU sends a work enable signal to the all-in-one controller, and the all-in-one controller converts the high voltage of the power battery into a low voltage, charges the low-voltage battery, and starts the vehicle.

[0063] like Figure 3 As shown, an embodiment of a VCU performing subsequent processing according to a feedback signal is provided. In this embodiment, the high-voltage pre-charging control method for a new energy vehicle further includes the following steps:

[0064] S201: After the VCU sends a pre-charging instruction to the all-in-one controller, the VCU continues to receive feedback signals from the all-in-one controller.

[0065] S202: The VCU determines whether the pre-charging is successful based on the feedback signal. If yes, it proceeds to S203; if not, it proceeds to S204.

[0066] S203: The VCU sends a high voltage command to the BMS of the power battery and enters S205.

[0067] S204: Pre-charging fails, the high voltage process ends, the vehicle stops starting, and this process ends.

[0068] S205: After receiving the high voltage command, the BMS controls the positive relay K2 and the negative relay K1 of the power battery to close, and feeds back the relay closing state signal to the VCU.

[0069] S206: The VCU determines whether it has received a status signal indicating that both relays are closed. If so, the VCU determines that the vehicle high voltage power-up is complete and proceeds to S207; if not, proceeds to S208.

[0070] S207: The VCU sends a work enable signal (specifically, a work enable signal of the DCDC) to the all-in-one controller, and enters S210.

[0071] S208: Determine whether the preset time has been exceeded, if yes, proceed to S209; if no, proceed to S206. In this embodiment, the preset time is 200ms.

[0072] S209: The vehicle fails to be high voltage, the process ends, and the vehicle stops starting.

[0073] S210: The all-in-one controller receives a work enable signal from the VCU, controls the DCDC to work in a normal working mode, converts the high voltage of the power battery into a low voltage, and charges the low voltage battery.

[0074] In a second aspect, the present application also provides a control system based on any one of the new energy vehicle high voltage pre-charging control method embodiments. Figure 4 As shown, the control system includes an all-in-one controller and a low-voltage battery. The all-in-one controller includes an MCU and a DCDC. The all-in-one controller is connected to the VCU, and the two communicate through the CAN bus. The all-in-one controller is used to control the voltage boost of the low-voltage battery. The low-voltage battery is connected to the all-in-one controller, which is used to boost the voltage to the pre-charge target voltage and pre-charge the first capacitor C1 of the MCU in the all-in-one controller; when the voltage of the first capacitor C1 reaches a preset percentage of the pre-charge target voltage within the pre-charge time, the pre-charge is successful.

[0075] Furthermore, in one embodiment, the control system of the high-voltage pre-charging control method for new energy vehicles also includes a power battery, which includes a positive relay K2 and a negative relay K1, and the power battery is connected to the all-in-one controller and the VCU respectively. The power battery is used to receive the high-voltage instruction of the VCU after the first capacitor C1 is pre-charged successfully, close the positive relay K2 and the negative relay K1 to increase the high voltage, and feedback the relay closing state signal; it is also used to convert the high voltage into the low voltage under the control of the all-in-one controller, charge the above-mentioned low-voltage battery, and realize vehicle starting.

[0076] Furthermore, in one embodiment, the all-in-one controller is also used to determine whether the low-voltage battery voltage meets the normal working voltage of the all-in-one controller after receiving the enable signal sent by the VCU. If so, control the low-voltage battery to boost to the pre-charge target voltage.

[0077] In this embodiment, the power battery includes a positive relay K2 and a negative relay K1, and there is no need to set a pre-charging branch. Compared with the traditional power battery pack, the pre-charging group, pre-charging relay and related high-voltage connecting lines and other related components are reduced, which can reduce the cost of the power battery; even if an all-in-one controller is used, the overall cost of the control system will still be reduced.

[0078] Through the DCDC reverse boost of the all-in-one controller, a low-voltage battery is used to pre-charge the first capacitor C1. When the pre-charging target voltage and the first capacitor C1 are constant, the larger the pre-charging target current is, the shorter the pre-charging time is. Therefore, the VCU can be used to adaptively adjust the target current using the vehicle pre-charging time requirements and the performance of the all-in-one controller, thereby controlling the vehicle pre-charging time requirements, making the pre-charging process controllable, and improving the pre-charging performance and pre-charging safety.

[0079] After the pre-charging of the first capacitor C1 is completed, the positive relay K2 and the negative relay K1 of the power battery are closed. After the high voltage is applied, the DCDC of the all-in-one controller works in the forward step-down mode according to the instruction to charge the low-voltage battery.

[0080] In the third aspect, an embodiment of the present application provides a new energy vehicle high-voltage pre-charging control device, which includes a processor, a memory, and a new energy vehicle high-voltage pre-charging control program stored in the memory and executable by the processor, wherein when the new energy vehicle high-voltage pre-charging control program is executed by the processor, the steps of any new energy vehicle high-voltage pre-charging control method embodiment are implemented.

[0081] In an embodiment of the present application, a new energy vehicle high voltage pre-charging control device may include a processor, a memory, a communication interface and a communication bus, wherein the communication bus may be of any type for interconnecting the processor, the memory and the communication interface.

[0082] The communication interface includes input / output (I / O) interface, physical interface and logical interface, etc., which are used to realize the interconnection of devices inside the new energy vehicle high-voltage pre-charging control device, and the interface used to realize the interconnection between the new energy vehicle high-voltage pre-charging control device and other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, a fiber optic interface, an ATM interface, etc.; the user device can be a display, etc.

[0083] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0084] The processor may be a general-purpose processor, which may call the new energy vehicle high-voltage pre-charging control device program stored in the memory and execute the new energy vehicle high-voltage pre-charging control method provided in the embodiment of the present application. The method executed when the new energy vehicle high-voltage pre-charging control program is called may refer to the various embodiments of the new energy vehicle high-voltage pre-charging control method of the present application, which will not be repeated here.

[0085] Those skilled in the art will understand that Figure 3 The hardware structure shown in the figure does not constitute a limitation on the present application, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0086] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0087] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings 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 limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit "first", "second" and "third" to different types.

[0088] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0089] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0090] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0091] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0092] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A high-voltage pre-charging control method for new energy vehicles, characterized in that: The method comprises the steps of: An all-in-one controller is used to connect the low-voltage battery, wherein the all-in-one controller includes a motor controller MCU and a DC-DC converter DCDC; The vehicle controller VCU controls the low-voltage battery to boost the voltage to the pre-charge target voltage through the all-in-one controller, and pre-charges the first capacitor C1 of the motor controller MCU in the all-in-one controller through the low-voltage battery; When the voltage of the first capacitor C1 reaches a preset percentage of the pre-charge target voltage within the pre-charge time, the pre-charge is successful.

2. The high-voltage pre-charging control method for new energy vehicles according to claim 1, characterized in that: Before the vehicle controller VCU controls the low-voltage battery to boost the voltage to the pre-charge target voltage through the all-in-one controller, it also includes: After the vehicle controller VCU detects the user's action of starting the vehicle, it determines whether the vehicle meets the starting conditions. If so, the vehicle controller VCU sends a pre-charging instruction to the all-in-one controller; if not, the vehicle does not start.

3. The high voltage pre-charging control method for new energy vehicles according to claim 2, characterized in that: The precharge instruction includes a precharge enable signal, a precharge target voltage, and a precharge target current.

4. The high-voltage pre-charging control method for new energy vehicles according to claim 3, characterized in that: The vehicle controller VCU controls the low-voltage battery to boost the voltage to the pre-charge target voltage through an all-in-one controller, including: After receiving the enable signal, the all-in-one controller determines whether the low-voltage battery voltage meets the normal working voltage of the all-in-one controller. If so, the low-voltage battery is controlled to be boosted to the target voltage according to the pre-charge target current.

5. The high-voltage pre-charging control method for new energy vehicles according to claim 1, characterized in that: When the voltage of the first capacitor C1 reaches a preset percentage of the pre-charge target voltage within the pre-charge time, the method includes: The all-in-one controller detects the voltage of the first capacitor C1 and compares it with the pre-charge target voltage. When the first capacitor C1 reaches a preset percentage of the pre-charge target voltage within the pre-charge time, the all-in-one controller feeds back to the vehicle controller VCU that the pre-charge is successful; otherwise, the all-in-one controller feeds back to the vehicle controller VCU that the pre-charge is unsuccessful.

6. The high voltage pre-charging control method for new energy vehicles according to claim 1, characterized in that: After the pre-charging is successful, the vehicle controller VCU sends a high-voltage instruction to the battery management system BMS of the power battery. If the high-voltage completion signal is received from the battery management system BMS within the preset time, the vehicle controller VCU sends a work enable signal to the all-in-one controller, and the all-in-one controller converts the high voltage of the power battery into low voltage and charges the low-voltage battery.

7. A control system based on the high voltage pre-charging control method for new energy vehicles according to any one of claims 1 to 6, characterized in that: The control system comprises: An all-in-one controller, which includes a motor controller MCU and a DC-DC converter DCDC, and the all-in-one controller is connected to a vehicle controller VCU to control the voltage boost of a low-voltage battery; A low-voltage battery is connected to the all-in-one controller and is used to boost the voltage to a pre-charge target voltage to pre-charge the first capacitor C1 of the motor controller MCU in the all-in-one controller; when the voltage of the first capacitor C1 reaches a preset percentage of the pre-charge target voltage within the pre-charge time, the pre-charge is successful.

8. The control system of the high-voltage pre-charging control method for new energy vehicles as claimed in claim 7, characterized in that: Also includes: A power battery is connected to the all-in-one controller and the vehicle controller VCU respectively. The power battery includes a positive relay K2 and a negative relay K1. The power battery is used to receive a high-voltage instruction from the vehicle controller VCU after the first capacitor C1 is pre-charged successfully, close the positive relay K2 and the negative relay K1 to increase the high voltage, and then feedback a relay closing state signal; the power battery is also used to convert the high voltage into a low voltage under the control of the all-in-one controller to charge the low-voltage battery.

9. The control system of the high-voltage pre-charging control method for new energy vehicles as claimed in claim 7, characterized in that: The all-in-one controller is also used to determine whether the low-voltage battery voltage meets the normal working voltage of the all-in-one controller after receiving the enable signal sent by the vehicle controller VCU. If so, control the low-voltage battery to boost to the pre-charge target voltage.

10. A high-voltage pre-charging control device for new energy vehicles, characterized in that: The new energy vehicle high-voltage pre-charging control device includes a processor, a memory, and a new energy vehicle high-voltage pre-charging control program stored in the memory and executable by the processor, wherein when the new energy vehicle high-voltage pre-charging control program is executed by the processor, the steps of the new energy vehicle high-voltage pre-charging control method as described in any one of claims 1 to 6 are implemented.

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