High-voltage system and troubleshooting method

Abstract

The application relates to a high-voltage system and a fault troubleshooting method. It belongs to the technical field of electric vehicles. The high-voltage system comprises a main controller, a fault troubleshooter, a load circuit, and a power supply circuit for supplying power to the load circuit. The load circuit comprises at least one load branch, and different load branches are connected in parallel with each other. Each load branch comprises a high-voltage load and a pre-charging relay connected to the positive electrode of the high-voltage load, and the pre-charging relay is connected to the fault troubleshooter. The fault troubleshooter and the power supply circuit are connected to the main controller. The main controller is used for detecting a pre-charging fault during the pre-charging process of the power supply circuit for each high-voltage load, and performing fault troubleshooting. After the pre-charging fault, the controller and the fault troubleshooter cooperate to troubleshoot each load branch one by one without manual intervention, which not only saves manpower investment, but also effectively improves the fault troubleshooting efficiency and the accuracy of the fault troubleshooting result.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, and in particular to a high-voltage system and a fault diagnosis method. Background Technology

[0002] In electric vehicles, high-voltage systems are used to supply power to high-voltage loads. With the development of electric vehicle technology, the number of high-voltage loads integrated into electric vehicles is gradually increasing. Therefore, to ensure the stable operation of electric vehicles, it is necessary to improve the safety and reliability of high-voltage systems.

[0003] Currently, when a pre-charging fault occurs during the pre-charging process of a high-voltage system, technicians need to locate the interface positions of each high-voltage load and check each load one by one to determine the cause of the pre-charging fault. However, this manual fault-finding method is highly complex, resulting in low fault-finding efficiency. Summary of the Invention

[0004] Therefore, it is necessary to provide a high-voltage system and fault diagnosis method that can effectively improve the efficiency of high-voltage system fault diagnosis in response to the above-mentioned technical problems.

[0005] In a first aspect, this application provides a high-voltage system. The high-voltage system includes a main controller, a fault detector, a load circuit, and a power supply circuit for supplying power to the load circuit;

[0006] The load circuit includes at least one load branch, with different load branches connected in parallel. Each load branch includes a high-voltage load and a pre-charge relay connected to the positive terminal of the high-voltage load, and the pre-charge relay is connected to the troubleshooter.

[0007] Both the troubleshooter and the power supply circuit are connected to the main controller.

[0008] The main controller is used to troubleshoot the power supply circuit after detecting a pre-charging fault during the pre-charging process of the power supply circuit for each high-voltage load, and / or control the fault troubleshooter to disconnect each pre-charging relay from the corresponding high-voltage load one by one, so as to troubleshoot the fault in each load branch.

[0009] In one embodiment, the power supply circuit includes a pre-charging circuit for pre-charging each high-voltage load;

[0010] The pre-charge circuit includes a DC-DC converter and a low-voltage battery connected to the low-voltage side of the DC-DC converter;

[0011] The DC-DC converter and each load branch form a pre-charge circuit;

[0012] Low-voltage batteries are used to supply power to the precharge circuit via a DC-DC converter.

[0013] In one embodiment, the high-voltage terminal of the DC-DC converter is connected to each precharge relay, and the negative terminal of the DC-DC converter is connected to the negative terminal of each high-voltage load.

[0014] In one embodiment, the power supply circuit includes a high-voltage circuit for supplying power to each high-voltage load;

[0015] The high-voltage circuit and each load branch form a high-voltage loop.

[0016] In one embodiment, the high-voltage circuit includes a power battery, a main positive relay, and a main negative relay;

[0017] The positive terminal of the power battery is connected to each pre-charge relay via the main positive relay; the negative terminal of the power battery is connected to the negative terminal of each high-voltage load via the main negative relay.

[0018] Secondly, this application provides a fault diagnosis method, applied to the controller of the high-voltage system mentioned in the first aspect above, the method comprising:

[0019] During the pre-charging process of the power supply circuit in the high-voltage system for each high-voltage load, if a pre-charging fault is detected, the power supply circuit is troubleshooted, and / or the fault detector in the high-voltage system is controlled to disconnect each pre-charging relay from the corresponding high-voltage load one by one, so as to troubleshoot each load branch.

[0020] In one embodiment, troubleshooting the power supply circuit and / or controlling the fault detector in the high-voltage system to disconnect each pre-charge relay from its corresponding high-voltage load one by one, in order to troubleshoot each load branch, includes:

[0021] Based on the high-voltage terminal voltage of the DC-DC converter in the power supply circuit, troubleshoot the power supply circuit, and / or control the fault detector in the high-voltage system to disconnect each pre-charge relay from the corresponding high-voltage load one by one, so as to troubleshoot each load branch.

[0022] In one embodiment, troubleshooting the power supply circuit is performed based on the high-voltage terminal voltage of the DC-DC converter in the power supply circuit, including:

[0023] If the high-voltage terminal voltage of the DC-DC converter in the power supply circuit is zero during the first preset time period, then the DC-DC converter is determined to be faulty.

[0024] In one embodiment, based on the high-voltage terminal voltage of the DC-DC converter in the power supply circuit, the fault detector in the high-voltage system is controlled to disconnect each pre-charge relay from its corresponding high-voltage load one by one to perform fault diagnosis on each load branch, including:

[0025] If the rise rate of the high-voltage terminal voltage of the DC-DC converter in the power supply circuit is greater than the preset rise rate during the second preset time period, or if the high-voltage terminal voltage is less than the preset pre-charge voltage during the third preset time period, the fault detector in the high-voltage system will disconnect each pre-charge relay from the corresponding high-voltage load one by one to troubleshoot each load branch.

[0026] In one embodiment, the fault detector in the high-voltage system disconnects each pre-charge relay from its corresponding high-voltage load one by one to perform fault diagnosis on each load branch, including:

[0027] For each precharge relay, the fault detector in the control high-voltage system disconnects the precharge relay from the corresponding high-voltage load and then checks whether the precharge fault has been eliminated.

[0028] If the fault is eliminated, it indicates a fault in the load branch where the precharge relay is located.

[0029] Thirdly, this application also provides a troubleshooting device. The device includes:

[0030] The fault diagnosis module is used to diagnose the power supply circuit when a pre-charging fault is detected during the pre-charging process of the power supply circuit in the high-voltage system for each high-voltage load, and / or control the fault diagnostic device in the high-voltage system to disconnect each pre-charging relay from the corresponding high-voltage load one by one, so as to diagnose the fault in each load branch.

[0031] Fourthly, this application also provides a computer device. The computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform the following steps:

[0032] During the pre-charging process of the power supply circuit in the high-voltage system for each high-voltage load, if a pre-charging fault is detected, the power supply circuit is troubleshooted, and / or the fault detector in the high-voltage system is controlled to disconnect each pre-charging relay from the corresponding high-voltage load one by one, so as to troubleshoot each load branch.

[0033] Fifthly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, performs the following steps:

[0034] During the pre-charging process of the power supply circuit in the high-voltage system for each high-voltage load, if a pre-charging fault is detected, the power supply circuit is troubleshooted, and / or the fault detector in the high-voltage system is controlled to disconnect each pre-charging relay from the corresponding high-voltage load one by one, so as to troubleshoot each load branch.

[0035] Sixthly, this application also provides a computer program product. The computer program product includes a computer program that, when executed by a processor, performs the following steps:

[0036] During the pre-charging process of the power supply circuit in the high-voltage system for each high-voltage load, if a pre-charging fault is detected, the power supply circuit is troubleshooted, and / or the fault detector in the high-voltage system is controlled to disconnect each pre-charging relay from the corresponding high-voltage load one by one, so as to troubleshoot each load branch.

[0037] The aforementioned high-voltage system includes a main controller, a fault detector, a load circuit, and a power supply circuit for supplying power to the load circuit. The load circuit includes at least one load branch, with different load branches connected in parallel. Each load branch includes a high-voltage load and a pre-charge relay connected to the positive terminal of the high-voltage load, and the pre-charge relay is connected to the fault detector. Both the fault detector and the power supply circuit are connected to the main controller. The main controller is used to detect a pre-charge fault during the pre-charging process of the power supply circuit for each high-voltage load, and to perform fault diagnosis on the power supply circuit, and / or control the fault detector to disconnect each pre-charge relay from its corresponding high-voltage load one by one, thereby diagnosing faults in each load branch. This application allows for fault diagnosis of the power supply circuit and / or individual fault diagnosis of each load branch after a pre-charge fault, through the cooperation of the controller and the fault detector, without manual intervention. This not only saves manpower but also effectively improves the efficiency and accuracy of fault diagnosis results. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of the first high-voltage system provided in this embodiment;

[0039] Figure 2 This is a schematic diagram of the structure of the second high-voltage system provided in this embodiment;

[0040] Figure 3 This is a schematic diagram of the third type of high-voltage system provided in this embodiment;

[0041] Figure 4 This is a flowchart illustrating the first troubleshooting method provided in this embodiment;

[0042] Figure 5 This is a flowchart illustrating the second troubleshooting method provided in this embodiment;

[0043] Figure 6 This is a structural block diagram of a fault diagnosis device provided in this embodiment;

[0044] Figure 7 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0046] In one embodiment, such as Figure 1 As shown, a high-voltage system is provided. The high-voltage system includes a main controller, a fault detector, a load circuit, and a power supply circuit for supplying power to the load circuit. The load circuit includes at least one load branch, with different load branches connected in parallel. Each load branch includes a high-voltage load and a pre-charge relay connected to the positive terminal of the high-voltage load, and the pre-charge relay is connected to the fault detector. Both the fault detector and the power supply circuit are connected to the main controller. The main controller is used to, during the pre-charging process of the power supply circuit for each high-voltage load, detect a pre-charge fault, perform fault diagnosis on the power supply circuit, and / or control the fault detector to disconnect each pre-charge relay from its corresponding high-voltage load one by one, thereby performing fault diagnosis on each load branch.

[0047] The load circuit refers to the high-voltage load circuit in an electric vehicle. A load circuit includes one or more load branches connected in parallel. Figure 1 Only three load branches are shown. The precharge relay is a relay that controls the on / off state of the corresponding load circuit. The main controller refers to the main control unit in the high-voltage system; the main controller can be, but is not limited to, the VCU (Vehicle Control Unit) of an electric vehicle. The troubleshooter is a device used to troubleshoot each load branch.

[0048] The aforementioned high-voltage system includes a main controller, a fault detector, a load circuit, and a power supply circuit for supplying power to the load circuit. The load circuit includes at least one load branch, with different load branches connected in parallel. Each load branch includes a high-voltage load and a pre-charge relay connected to the positive terminal of the high-voltage load, and the pre-charge relay is connected to the fault detector. Both the fault detector and the power supply circuit are connected to the main controller. The main controller is used to detect a pre-charge fault during the pre-charging process of the power supply circuit for each high-voltage load, and to perform fault diagnosis on the power supply circuit, and / or control the fault detector to disconnect each pre-charge relay from its corresponding high-voltage load one by one, thereby diagnosing faults in each load branch. This application allows for fault diagnosis of each load branch one by one after a pre-charge fault, through the cooperation of the controller and the fault detector, without manual intervention. This not only saves manpower but also effectively improves the efficiency and accuracy of fault diagnosis results.

[0049] In one embodiment, such as Figure 2 As shown, the power supply circuit includes a pre-charge circuit for pre-charging each high-voltage load. The pre-charge circuit includes a DC-DC converter and a low-voltage battery connected to the low-voltage terminal of the DC-DC converter. The DC-DC converter and each load branch form a pre-charge loop. The low-voltage battery supplies power to the pre-charge loop through the DC-DC converter.

[0050] A DC-DC converter refers to a DC-DC voltage converter. Its purpose is to convert the voltage of a low-voltage battery to a high voltage to pre-charge the load branch. A DC-DC converter can be a DC / DC (Direct Current to Direct Current) module.

[0051] Optionally, in this embodiment, the high-voltage terminal of the DC-DC converter is connected to each pre-charge relay, and the negative terminal of the DC-DC converter is connected to the negative terminal of each high-voltage load. The on / off state of each load branch can be controlled by controlling the on / off state of the pre-charge relays.

[0052] During the pre-charge phase, the DC-DC converter converts the low voltage of the low-voltage battery to a high voltage to pre-charge the load circuit. Specifically, it pre-charges the high-voltage load in the load circuit.

[0053] Optionally, in this embodiment, the low-voltage battery is also used to power low-voltage loads in the electric vehicle.

[0054] In one embodiment, such as Figure 3 As shown, the power supply circuit includes a high-voltage circuit for supplying power to each high-voltage load; the high-voltage circuit and each load branch form a high-voltage loop. The high-voltage circuit includes a power battery, a main positive relay, and a main negative relay; the positive terminal of the power battery is connected to each pre-charge relay through the main positive relay; the negative terminal of the power battery is connected to the negative terminal of each high-voltage load through the main negative relay.

[0055] The high-voltage circuit refers to the circuit used to provide high-voltage power to the load circuit, primarily powered by the power battery within the high-voltage circuit. The main positive relay is the relay located at the positive terminal of the power battery. The main negative relay is the relay located at the negative terminal of the power battery.

[0056] During operation, the main controller can control the connection and disconnection of the circuit between the power battery and the load circuit by controlling the on / off state of the main positive relay and the main negative relay.

[0057] In one embodiment, this application also provides a troubleshooting method, applied to the above-mentioned... Figure 1 The main controller in the high-voltage system, such as Figure 4 As shown, the method includes:

[0058] S401, during the pre-charging process of the power supply circuit in the high-voltage system for each high-voltage load, if a pre-charging fault is detected, the power supply circuit is troubleshooted, and / or the fault detector in the high-voltage system is controlled to disconnect each pre-charging relay from the corresponding high-voltage load one by one, so as to troubleshoot each load branch.

[0059] In this embodiment, the method for detecting whether a pre-charging failure has occurred is as follows: if it is detected that high voltage power-on cannot be performed, it is determined to be a pre-charging failure.

[0060] One possible implementation method for troubleshooting after detecting a pre-charge fault in this application is to troubleshoot the power supply circuit.

[0061] Another optional implementation method for troubleshooting after detecting a precharge fault in this application is to control the fault detector in the high-voltage system to disconnect each precharge relay from the corresponding high-voltage load one by one in order to troubleshoot each load branch.

[0062] Another optional implementation method for troubleshooting after detecting a precharge fault in this application is to troubleshoot the power supply circuit and disconnect each precharge relay from the corresponding high-voltage load one by one using the fault troubleshooter in the control high-voltage system, so as to troubleshoot each load branch.

[0063] Optionally, in this embodiment, the fault diagnosis of the power supply circuit can be performed based on the high-voltage terminal voltage of the DC-DC converter in the power supply circuit. Specifically, if the high-voltage terminal voltage of the DC-DC converter in the power supply circuit is zero within a first preset time period, then the DC-DC converter is determined to be faulty. Conversely, if the high-voltage terminal voltage of the DC-DC converter in the power supply circuit is not zero within the first preset time period, then the DC-DC converter is determined not to be faulty.

[0064] Optionally, in this embodiment, the fault detector in the high-voltage system disconnects each pre-charge relay from its corresponding high-voltage load one by one to troubleshoot each load branch. Specifically, based on the high-voltage terminal voltage of the DC-DC converter in the power supply circuit, the fault detector in the high-voltage system disconnects each pre-charge relay from its corresponding high-voltage load one by one to troubleshoot each load branch. Specifically, if the rise in the high-voltage terminal voltage of the DC-DC converter in the power supply circuit is greater than a preset rise in the second preset time period (this may be due to an internal short circuit in the high-voltage load or a short circuit in the connector in a certain load branch), or if the high-voltage terminal voltage is less than the preset pre-charge voltage in the third preset time period (this may be due to an internal failure in the high-voltage load of a certain load branch or an increase in internal resistance caused by water immersion in the connector, exceeding the pre-charge capacity of the DC-DC converter), then the fault detector in the high-voltage system disconnects each pre-charge relay from its corresponding high-voltage load one by one to troubleshoot each load branch. The first, second, and third preset time periods refer to pre-configured time periods, and their durations can be the same or different.

[0065] Optionally, in this embodiment, the fault detector in the high-voltage system disconnects each pre-charge relay from its corresponding high-voltage load one by one to troubleshoot each load branch. An alternative implementation involves, for each pre-charge relay, after disconnecting the pre-charge relay from its corresponding high-voltage load, detecting whether the pre-charge fault has been eliminated. If eliminated, it is determined that the load branch containing the pre-charge relay has a fault. For example, if the rise in voltage at the high-voltage end of the DC-DC converter in the power supply circuit exceeds a preset rise in voltage during a second preset time period, each pre-charge relay is disconnected one by one. If, after disconnecting one pre-charge relay, the rise in voltage at the high-voltage end of the DC-DC converter in the power supply circuit still exceeds the preset rise in voltage during the second preset time period, it is considered that the load branch containing that pre-charge relay is not faulty. The next pre-charge relay is then disconnected, and so on, until no fault occurs after disconnecting a certain pre-charge relay. In this case, it is considered that the load branch containing that pre-charge relay has a fault.

[0066] In this embodiment, during the pre-charging process of the power supply circuit in the high-voltage system for each high-voltage load, if a pre-charging fault is detected, the power supply circuit is troubleshooted, and / or the fault detector in the high-voltage system is controlled to disconnect each pre-charging relay from its corresponding high-voltage load one by one, in order to troubleshoot each load branch. When a pre-charging fault occurs, based on this application, not only can the power supply circuit be troubleshooted, but each load branch can also be troubleshooted one by one using the fault detector, without manual intervention. This not only saves manpower but also effectively improves the efficiency and accuracy of fault troubleshooting results.

[0067] In one embodiment, such as Figure 5 As shown, this application also provides another optional implementation of the fault diagnosis method, including:

[0068] S501 indicates that a pre-charge fault was detected during the pre-charging process of the power supply circuit in the high-voltage system for each high-voltage load.

[0069] S502, if the high-voltage terminal voltage of the DC converter in the power supply circuit is zero during the first preset time period, then it is determined that the DC converter has failed.

[0070] S503: If the high-voltage terminal voltage of the DC-DC converter in the power supply circuit is not zero within the first preset time period, it is determined that the DC-DC converter has not malfunctioned. Then execute S504.

[0071] S504 If the rise amplitude of the high voltage terminal voltage of the DC converter in the power supply circuit is greater than the preset rise amplitude during the second preset time period, or if the high voltage terminal voltage is less than the preset precharge voltage during the third preset time period, then for each precharge relay, the fault detector in the high voltage system is controlled to disconnect the connection between the precharge relay and the corresponding high voltage load, and then the precharge fault is checked to see if it has been eliminated.

[0072] If S505 is cleared, it indicates a fault in the load branch where the precharge relay is located.

[0073] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0074] Based on the same inventive concept, this application also provides a fault diagnosis device for implementing the high-voltage system and method described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations in one or more fault diagnosis device embodiments provided below can be found in the limitations of the high-voltage system and method described above, and will not be repeated here.

[0075] In one embodiment, such as Figure 6As shown, a fault diagnosis device 1 is provided, including: a fault diagnosis module 10, wherein:

[0076] The fault diagnosis module 10 is used to perform fault diagnosis on the power supply circuit when a pre-charging fault is detected during the pre-charging process of the power supply circuit in the high-voltage system for each high-voltage load, and / or control the fault diagnostic device in the high-voltage system to disconnect each pre-charging relay from the corresponding high-voltage load one by one, so as to perform fault diagnosis on each load branch.

[0077] In one embodiment, the upper Figure 6 The troubleshooting module 10 is also specifically used for:

[0078] Based on the high-voltage terminal voltage of the DC-DC converter in the power supply circuit, troubleshoot the power supply circuit, and / or control the fault detector in the high-voltage system to disconnect each pre-charge relay from the corresponding high-voltage load one by one, so as to troubleshoot each load branch.

[0079] In one embodiment, the upper Figure 6 The troubleshooting module 10 is also specifically used for:

[0080] If the high-voltage terminal voltage of the DC-DC converter in the power supply circuit is zero during the first preset time period, then the DC-DC converter is determined to be faulty.

[0081] In one embodiment, the upper Figure 6 The troubleshooting module 10 is also specifically used for:

[0082] If the rise rate of the high-voltage terminal voltage of the DC-DC converter in the power supply circuit is greater than the preset rise rate during the second preset time period, or if the high-voltage terminal voltage is less than the preset pre-charge voltage during the third preset time period, the fault detector in the high-voltage system will disconnect each pre-charge relay from the corresponding high-voltage load one by one to troubleshoot each load branch.

[0083] In one embodiment, the upper Figure 6 The troubleshooting module 10 is also specifically used for:

[0084] For each precharge relay, the fault detector in the control high-voltage system disconnects the precharge relay from the corresponding high-voltage load and then checks whether the precharge fault has been eliminated.

[0085] If the fault is eliminated, it indicates a fault in the load branch where the precharge relay is located.

[0086] Each module in the aforementioned troubleshooting device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of the computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0087] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 7 As shown, the computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores voltage-related data for various components in the high-voltage system. The I / O interfaces are used for information exchange between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When the computer program is executed by the processor, it implements a high-voltage system and method.

[0088] Those skilled in the art will understand that Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0089] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0090] During the pre-charging process of the power supply circuit in the high-voltage system for each high-voltage load, if a pre-charging fault is detected, the power supply circuit is troubleshooted, and / or the fault detector in the high-voltage system is controlled to disconnect each pre-charging relay from the corresponding high-voltage load one by one, so as to troubleshoot each load branch.

[0091] In one embodiment, when the processor executes the computer program, it further performs the following steps: troubleshooting the power supply circuit, and / or controlling the fault detector in the high-voltage system to disconnect each pre-charge relay from the corresponding high-voltage load one by one, in order to troubleshoot each load branch, including:

[0092] Based on the high-voltage terminal voltage of the DC-DC converter in the power supply circuit, troubleshoot the power supply circuit, and / or control the fault detector in the high-voltage system to disconnect each pre-charge relay from the corresponding high-voltage load one by one, so as to troubleshoot each load branch.

[0093] In one embodiment, when the processor executes the computer program, it further performs the following steps: troubleshooting the power supply circuit based on the high-voltage terminal voltage of the DC-DC converter in the power supply circuit, including:

[0094] If the high-voltage terminal voltage of the DC-DC converter in the power supply circuit is zero during the first preset time period, then the DC-DC converter is determined to be faulty.

[0095] In one embodiment, when the processor executes the computer program, it further performs the following steps: based on the high-voltage terminal voltage of the DC-DC converter in the power supply circuit, it controls the fault detector in the high-voltage system to disconnect each pre-charge relay from its corresponding high-voltage load one by one, in order to perform fault diagnosis on each load branch, including:

[0096] If the rise rate of the high-voltage terminal voltage of the DC-DC converter in the power supply circuit is greater than the preset rise rate during the second preset time period, or if the high-voltage terminal voltage is less than the preset pre-charge voltage during the third preset time period, the fault detector in the high-voltage system will disconnect each pre-charge relay from the corresponding high-voltage load one by one to troubleshoot each load branch.

[0097] In one embodiment, when the processor executes the computer program, it further performs the following steps: controlling the fault detector in the high-voltage system to disconnect each pre-charged relay from its corresponding high-voltage load one by one, in order to perform fault diagnosis on each load branch, including:

[0098] For each precharge relay, the fault detector in the control high-voltage system disconnects the precharge relay from the corresponding high-voltage load and then checks whether the precharge fault has been eliminated.

[0099] If the fault is eliminated, it indicates a fault in the load branch where the precharge relay is located.

[0100] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0101] During the pre-charging process of the power supply circuit in the high-voltage system for each high-voltage load, if a pre-charging fault is detected, the power supply circuit is troubleshooted, and / or the fault detector in the high-voltage system is controlled to disconnect each pre-charging relay from the corresponding high-voltage load one by one, so as to troubleshoot each load branch.

[0102] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: troubleshooting the power supply circuit, and / or controlling the fault detector in the high-voltage system to disconnect each pre-charge relay from the corresponding high-voltage load one by one, in order to troubleshoot each load branch, including:

[0103] Based on the high-voltage terminal voltage of the DC-DC converter in the power supply circuit, troubleshoot the power supply circuit, and / or control the fault detector in the high-voltage system to disconnect each pre-charge relay from the corresponding high-voltage load one by one, so as to troubleshoot each load branch.

[0104] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: troubleshooting the power supply circuit based on the high-voltage terminal voltage of the DC-DC converter in the power supply circuit, including:

[0105] If the high-voltage terminal voltage of the DC-DC converter in the power supply circuit is zero during the first preset time period, then the DC-DC converter is determined to be faulty.

[0106] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: based on the high-voltage terminal voltage of the DC-DC converter in the power supply circuit, it controls the fault detector in the high-voltage system to disconnect each pre-charge relay from its corresponding high-voltage load one by one, in order to perform fault diagnosis on each load branch, including:

[0107] If the rise rate of the high-voltage terminal voltage of the DC-DC converter in the power supply circuit is greater than the preset rise rate during the second preset time period, or if the high-voltage terminal voltage is less than the preset pre-charge voltage during the third preset time period, the fault detector in the high-voltage system will disconnect each pre-charge relay from the corresponding high-voltage load one by one to troubleshoot each load branch.

[0108] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: controlling the fault detector in the high-voltage system to disconnect each pre-charged relay from its corresponding high-voltage load one by one, in order to perform fault diagnosis on each load branch, including:

[0109] For each precharge relay, the fault detector in the control high-voltage system disconnects the precharge relay from the corresponding high-voltage load and then checks whether the precharge fault has been eliminated.

[0110] If the fault is eliminated, it indicates a fault in the load branch where the precharge relay is located.

[0111] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0112] During the pre-charging process of the power supply circuit in the high-voltage system for each high-voltage load, if a pre-charging fault is detected, the power supply circuit is troubleshooted, and / or the fault detector in the high-voltage system is controlled to disconnect each pre-charging relay from the corresponding high-voltage load one by one, so as to troubleshoot each load branch.

[0113] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: troubleshooting the power supply circuit, and / or controlling the fault detector in the high-voltage system to disconnect each pre-charge relay from the corresponding high-voltage load one by one, in order to troubleshoot each load branch, including:

[0114] Based on the high-voltage terminal voltage of the DC-DC converter in the power supply circuit, troubleshoot the power supply circuit, and / or control the fault detector in the high-voltage system to disconnect each pre-charge relay from the corresponding high-voltage load one by one, so as to troubleshoot each load branch.

[0115] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: troubleshooting the power supply circuit based on the high-voltage terminal voltage of the DC-DC converter in the power supply circuit, including:

[0116] If the high-voltage terminal voltage of the DC-DC converter in the power supply circuit is zero during the first preset time period, then the DC-DC converter is determined to be faulty.

[0117] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: based on the high-voltage terminal voltage of the DC-DC converter in the power supply circuit, it controls the fault detector in the high-voltage system to disconnect each pre-charge relay from its corresponding high-voltage load one by one, in order to perform fault diagnosis on each load branch, including:

[0118] If the rise rate of the high-voltage terminal voltage of the DC-DC converter in the power supply circuit is greater than the preset rise rate during the second preset time period, or if the high-voltage terminal voltage is less than the preset pre-charge voltage during the third preset time period, the fault detector in the high-voltage system will disconnect each pre-charge relay from the corresponding high-voltage load one by one to troubleshoot each load branch.

[0119] In one embodiment, when the computer program is executed by the processor, it further performs the following steps: controlling the fault detector in the high-voltage system to disconnect each pre-charged relay from its corresponding high-voltage load one by one, in order to perform fault diagnosis on each load branch, including:

[0120] In one embodiment, when the computer program is executed by the processor, it also performs the following steps: after the fault detector in the high-voltage system disconnects the precharge relay from the corresponding high-voltage load, it detects whether the precharge fault has been eliminated.

[0121] If the fault is eliminated, it indicates a fault in the load branch where the precharge relay is located.

[0122] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0123] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0124] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A high-voltage system, characterized in that, include: The main controller, the troubleshooter, the load circuit, and the power supply circuit for supplying power to the load circuit; The load circuit includes at least one load branch, with different load branches connected in parallel. Each load branch includes a high-voltage load and a pre-charge relay connected to the positive terminal of the high-voltage load, and the pre-charge relay is connected to the fault troubleshooter. Both the troubleshooter and the power supply circuit are connected to the main controller. The power supply circuit includes a pre-charging circuit for pre-charging each high-voltage load; the pre-charging circuit includes a DC-DC converter and a low-voltage battery connected to the low-voltage terminal of the DC-DC converter; the DC-DC converter and each load branch form a pre-charging circuit; the low-voltage battery is used to supply power to the pre-charging circuit through the DC-DC converter; the high-voltage terminal of the DC-DC converter is connected to each pre-charging relay, and the negative terminal of the DC-DC converter is connected to the negative terminal of each high-voltage load; The main controller is used to detect a pre-charging fault during the pre-charging process of the power supply circuit for each high-voltage load, and then, based on the high-voltage terminal voltage of the DC converter in the power supply circuit, troubleshoot the power supply circuit, and / or control the fault troubleshooter to disconnect each pre-charging relay from the corresponding high-voltage load one by one, so as to troubleshoot each load branch. The main controller is further configured to determine that the DC converter has malfunctioned if the high-voltage terminal voltage of the DC converter in the power supply circuit is zero during a first preset time period. If the rise amplitude of the high-voltage terminal voltage of the DC-DC converter in the power supply circuit is greater than the preset rise amplitude during the second preset time period, or if the high-voltage terminal voltage is less than the preset pre-charge voltage during the third preset time period, then for each pre-charge relay, the fault detector in the high-voltage system is controlled to disconnect the connection between the pre-charge relay and the corresponding high-voltage load, and then the pre-charge fault is detected; if it is eliminated, it is determined that a fault has occurred in the load branch where the pre-charge relay is located.

2. The system according to claim 1, characterized in that, The power supply circuit includes a high-voltage circuit for supplying power to each high-voltage load; The high-voltage circuit and each load branch form a high-voltage loop.

3. The system according to claim 2, characterized in that, The high-voltage circuit includes a power battery, a main positive relay, and a main negative relay; The positive terminal of the power battery is connected to each pre-charge relay through the main positive relay; the negative terminal of the power battery is connected to the negative terminal of each high-voltage load through the main negative relay.

4. A troubleshooting method, characterized in that, The main controller applied in any one of the high-voltage systems of claims 1 to 3 comprises: During the pre-charging process of the power supply circuit in the high-voltage system for each high-voltage load in the high-voltage system, if a pre-charging fault is detected, the power supply circuit is troubleshooted, and / or the fault detector in the high-voltage system is controlled to disconnect each pre-charging relay from the corresponding high-voltage load one by one, so as to troubleshoot each load branch.

5. The method according to claim 4, characterized in that, The process of troubleshooting the power supply circuit and / or controlling the fault detector in the high-voltage system to disconnect each pre-charge relay from its corresponding high-voltage load in turn, in order to troubleshoot each load branch, includes: Based on the high-voltage terminal voltage of the DC-DC converter in the power supply circuit, troubleshoot the power supply circuit, and / or control the fault detector in the high-voltage system to disconnect each pre-charge relay from the corresponding high-voltage load one by one, so as to troubleshoot each load branch.

6. The method according to claim 5, characterized in that, The step of troubleshooting the power supply circuit based on the high-voltage terminal voltage of the DC-DC converter in the power supply circuit includes: If the high-voltage terminal voltage of the DC-DC converter in the power supply circuit is zero during the first preset time period, then the DC-DC converter is determined to be faulty.

7. The method according to claim 5, characterized in that, The step of controlling the fault detector in the high-voltage system to disconnect each pre-charge relay from its corresponding high-voltage load one by one, based on the high-voltage terminal voltage of the DC converter in the power supply circuit, is to perform fault diagnosis on each load branch, including: If the rise rate of the high-voltage terminal voltage of the DC-DC converter in the power supply circuit is greater than the preset rise rate during the second preset time period, or if the high-voltage terminal voltage is less than the preset pre-charge voltage during the third preset time period, then the fault detector in the high-voltage system is controlled to disconnect each pre-charge relay from the corresponding high-voltage load one by one, so as to perform fault diagnosis on each load branch.

8. The method according to claim 7, characterized in that, The fault detector in the high-voltage system disconnects each pre-charge relay from its corresponding high-voltage load one by one to perform fault diagnosis on each load branch, including: For each precharge relay, after the fault detector in the high-voltage system disconnects the precharge relay from the corresponding high-voltage load, it checks whether the precharge fault has been eliminated. If the fault is eliminated, it is determined that there is a fault in the load branch where the precharge relay is located.

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