Grounding protection device and method of vehicle-mounted power supply system and vehicle-mounted power supply system

Abstract

The invention relates to a grounding protection device and method of a vehicle-mounted power supply system and the vehicle-mounted power supply system, and relates to the technical field of vehicles. The grounding protection device comprises a control module and a monitoring module, the monitoring module can collect real-time current of a load grounding point and report abnormal information, and the control module can isolate the load corresponding to the monitoring module according to the information reported by the monitoring module, so that a fault circuit is prevented from influencing other loads, and the overall stability of a vehicle-mounted power supply system is ensured. The monitoring module can collect high-frequency current data of a grounding point in real time, so that static detection limitation of voltage impedance measurement can be broken through, circuit faults existing only during dynamic operation of a vehicle are detected, the detection rate of intermittent faults of a vehicle-mounted power supply system is increased, faults related to high-frequency impedance can be detected, and the detection accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a grounding protection device and method for an on-board power supply system, and an on-board power supply system. Background Art

[0002] In a vehicle's power system, the grounding point serves as a common reference point and safe discharge path for the current loop, making its integrity crucial. An abnormal grounding point status could indicate a circuit fault, such as a connection failure, requiring prompt action.

[0003] Currently, vehicle ground point protection testing typically requires technicians to use a multimeter to measure the ground resistance. If an anomaly is detected, the technicians then investigate the cause and develop protective measures. This manual, point-by-point testing method is not only cumbersome but also inaccurate. It fails to reflect the true state of the ground points within the vehicle's complex power supply system, making it impossible to implement targeted protection strategies. Summary of the Invention

[0004] One of the objectives of the present invention is to provide a grounding protection device and method for an on-board power system and an on-board power system, so as to solve the problem of difficulty in grounding protection of the on-board power system.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A grounding protection device for an on-board power supply system, the on-board power supply system including an on-board power supply and an on-board load, wherein the on-board load has a corresponding load grounding point in the on-board power supply system; the grounding protection device includes: a control module and a monitoring module deployed at the load grounding point, the control module being communicatively connected to the monitoring module, wherein:

[0007] The monitoring module is configured to: collect the real-time current of the corresponding load grounding point and determine whether the real-time current is within a reference interval; if not, report abnormal information of the load grounding point to the control module;

[0008] The control module is configured to determine circuit fault information corresponding to the load grounding point according to the abnormal information, and isolate the vehicle-mounted load according to the circuit fault information.

[0009] Furthermore, when the control module determines the circuit fault information corresponding to the load grounding point according to the abnormal information, it is specifically configured to:

[0010] Determining whether there is a shunt in the circuit corresponding to the load grounding point;

[0011] If there is shunt, generating first type of circuit fault information according to the abnormal information and the current of the circuit adjacent to the load grounding point;

[0012] If there is no diversion, a second type of circuit fault information is generated according to the abnormal information.

[0013] Further, determining whether there is current shunting in the circuit corresponding to the load grounding point includes:

[0014] Obtaining a target voltage and a reference phase difference of the vehicle-mounted load;

[0015] The phase difference between the target voltage and the real-time current is calculated. If the calculated phase difference is consistent with the reference phase difference, no shunt occurs. If not, shunt occurs.

[0016] Furthermore, the abnormal information includes current abnormality data and a cyclic redundancy check code. When the control module determines the circuit fault information corresponding to the load grounding point according to the abnormal information, the control module is specifically configured to:

[0017] Verify whether the cyclic redundancy check code is correct according to the abnormal current data; if correct, generate circuit fault information according to the abnormal current data.

[0018] Furthermore, the monitoring module has a built-in acceleration sensor, and the monitoring module is further configured to:

[0019] collecting the vibration intensity of the load grounding point by the acceleration sensor;

[0020] The upper limit value and / or the lower limit value of the reference interval are modified according to the vibration intensity.

[0021] Furthermore, the monitoring module includes an isolation unit, which is configured to:

[0022] If the real-time current collected by the monitoring module for multiple consecutive cycles is not within the reference range, the circuit corresponding to the load grounding point is turned off.

[0023] Furthermore, when isolating the vehicle-mounted load, the control module is specifically configured to:

[0024] Determining whether the current vehicle speed is greater than a safe speed, and if so, reducing the voltage of the vehicle load and reducing the vehicle speed;

[0025] When the current vehicle speed decreases to less than a safe speed, power supply to the vehicle load is stopped.

[0026] Furthermore, the monitoring module has a built-in communication unit. When reporting abnormal information to the control module, the monitoring module is specifically configured to:

[0027] Sending abnormal information to the control module through the communication unit based on long-distance radio LORA;

[0028] If the communication of the communication connection is blocked, the abnormal information is stored locally and retransmitted after the communication is restored.

[0029] A grounding protection method for an on-board power supply system can be applied to a control module in any of the above-mentioned grounding protection devices, the method comprising:

[0030] receiving abnormal information of a load grounding point reported by a monitoring module in the grounding protection device, wherein the abnormal information is reported by the monitoring module when determining that the collected real-time current of the corresponding load grounding point is not within a reference interval;

[0031] Determining circuit fault information corresponding to the load grounding point based on the abnormal information;

[0032] The vehicle-mounted load is isolated according to the circuit fault information.

[0033] An on-vehicle power supply system comprises an on-vehicle power supply, an on-vehicle load and a grounding protection device as described in any one of the above items.

[0034] An electronic device comprises: a processor, and a memory communicatively connected to the processor;

[0035] The memory stores computer-executable instructions;

[0036] The processor executes the computer-executable instructions stored in the memory to implement the grounding protection method as described in any one of the above items.

[0037] A computer-readable storage medium comprises: computer-executable instructions stored in the computer-readable storage medium, wherein the computer-executable instructions are used to implement any of the above grounding protection methods when executed by a processor.

[0038] A computer program product comprises a computer program, wherein when the computer program is executed by a processor, the grounding protection method as described in any one of the above items is implemented.

[0039] The beneficial effects of the present invention include: the control module can isolate the load corresponding to the monitoring module based on the information reported by the monitoring module, preventing the faulty circuit from affecting other loads and ensuring the overall stability of the vehicle power system. The monitoring module can collect high-frequency current data at the ground point in real time, thus breaking through the static detection limitations of voltage-impedance measurement and detecting circuit faults that only exist during dynamic vehicle operation. This improves the detection rate of intermittent faults in the vehicle power system and can also detect faults related to high-frequency impedance, improving detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1A schematic structural diagram of a vehicle power supply system provided by an exemplary embodiment of the present invention;

[0041] Figure 2 A schematic structural diagram of a ground protection device provided by an exemplary embodiment of the present invention;

[0042] Figure 3 A schematic diagram of interaction of a monitoring module reporting information provided by an exemplary embodiment of the present invention;

[0043] Figure 4 A schematic flow chart of a ground protection method provided by an exemplary embodiment of the present invention;

[0044] Figure 5 A schematic structural diagram of an electronic device provided by an exemplary embodiment of the present invention.

[0045] The above drawings have shown specific embodiments of the present invention, which will be described in more detail below. These drawings and the text description are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0046] The following describes the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will readily appreciate the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the various details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are intended only to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0047] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0048] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent like or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0049] The terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, product, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, product, or apparatus. Without further limitation, the presence of additional identical or equivalent elements in a process, method, product, or apparatus that includes the elements is not precluded. For example, the terms "first," "second," etc., when used, are used to indicate names and do not imply any particular order.

[0050] As the core of the vehicle's electrical architecture, the onboard power system has long relied primarily on a 12V low-voltage power system as standard. With the development of new energy vehicles and the increasing electrification of vehicles, some models have begun to utilize 48V power systems, increasing power density to more than four times that of traditional 12V systems. These systems involve various loads, such as battery management systems and motor controllers. As onboard power systems become increasingly complex, their electrical safety, especially the safety protection of the numerous grounding points within them, is paramount.

[0051] Currently, ground point protection in vehicle power systems primarily relies on static impedance measurement. This requires manually disconnecting the power supply and performing offline testing with a multimeter or specialized instrument. If the ground point is abnormal, the cause must be investigated, and fuses must be used to disconnect the associated loads and circuits if necessary. This manual troubleshooting method is inefficient and fails to accurately reflect the true state of the ground point in a vehicle's complex power system. Consequently, detection accuracy is low, making it difficult to implement targeted protection measures in a timely manner.

[0052] The inventors found that the reason for the low accuracy of the above-mentioned grounding point status detection is that, first, it can only be used to detect vehicles in static scenarios, and is not suitable for dynamic scenarios of vehicle operation. The electrical environment of the on-board power supply system when the vehicle is in driving state is different from the electrical environment in the static state after power failure; second, measuring the grounding point voltage drop with a multimeter can only be used to judge DC-related faults, and it is difficult to determine high-frequency impedance-related faults.

[0053] Based on this, a technical concept has been proposed for deploying a ground protection device for vehicle power systems. This device can include a control module and a monitoring module deployed at the grounding point corresponding to the load in the vehicle power system. The monitoring module can sense the grounding point status by collecting real-time current at the grounding point and report abnormalities to the control module. The control module can then determine whether a fault exists based on this information and isolate the fault accordingly. The device is unaffected by the vehicle's power-on status and can detect even small current changes while the vehicle is in motion. It promptly reports abnormalities and implements fault isolation protection. This can improve the accuracy of grounding point detection and enhance the safety of the vehicle power system.

[0054] The application scenarios mentioned above are only some examples. Those skilled in the art can expand the application according to specific needs and scenarios. The embodiments of the present invention do not impose specific limitations on this. Figures 1 to 5 A ground protection device and method for a vehicle power system and a vehicle power system according to an exemplary embodiment of the present invention will be described.

[0055] Figure 1 This is a schematic diagram of the structure of a vehicle power supply system provided by an exemplary embodiment of the present invention. Figure 1 As shown, the vehicle power supply system may include a vehicle power supply, a power distribution assembly and a vehicle load. The vehicle power supply can distribute power to the vehicle load through the power distribution assembly. The vehicle load can have a corresponding load grounding point in the vehicle power supply system (such as GND1, GND2, ..., GNDn are all load grounding points, and n is a positive integer).

[0056] In one embodiment, a grounding protection device for a vehicle power system is provided.

[0057] The ground protection device provided by the embodiment of the present invention may include a control module and a monitoring module deployed at a load grounding point, and the control module is communicatively connected with the monitoring module.

[0058] Among them, the monitoring module is configured to: collect the real-time current of the corresponding load grounding point, and determine whether the real-time current is within the reference range; if it is not within the reference range, report abnormal information of the load grounding point to the control module.

[0059] Figure 2 This is a schematic diagram of the structure of a ground protection device provided by an exemplary embodiment of the present invention. Figure 2 As shown, monitoring module 1, monitoring module 2, ..., monitoring module n are correspondingly deployed at the load grounding points (GND1, GND2, ..., GNDn).

[0060] In an embodiment of the present invention, the reference interval has at least one lower limit value A or upper limit value B. For example, the reference interval can be [A,∞], [0,B], or [A,B]. A and B are both specific current thresholds, and ∞ indicates that the current value is infinite. The upper and lower limits of the reference interval can be set based on the electrical environment corresponding to the grounding point (including circuit structure and load type, etc.), or can be set based on historical circuit data of the grounding point.

[0061] The abnormal information reported by the monitoring module may include the real-time current value of the grounding point, and may also include the comparison result between the real-time current and the current threshold.

[0062] In some possible implementations, the monitoring module may include a built-in current sensor that can collect the real-time current at the grounding point and compare it with the current threshold in a reference interval to determine whether to report it. For example, in the reference interval [A, B], if the real-time current at the grounding point is less than A, it can be considered too low, possibly indicating poor contact, and the abnormality will be reported to the control module. Alternatively, if the real-time current at the grounding point is greater than B, it can be considered too high, possibly indicating a short circuit, and the abnormality will be reported to the control module.

[0063] In some possible implementations, the monitoring module may have a built-in current comparator, which may have an output terminal and at least two input terminals, one of which is connected to the ground point for inputting the real-time circuit of the ground point, and the remaining input terminals are used to input the upper limit or lower limit of the reference interval. The output terminal may be set to output a specific level signal to the control module, for example, outputting a high level when the real-time current of the ground point is less than the lower limit of the reference interval.

[0064] In some possible implementations, the monitoring module may have a built-in communication unit, which may send abnormality information to the control module via a communication method such as LORA (Long Range Radio).

[0065] Exemplarily, when the monitoring module reports abnormal information to the control module, it is specifically configured to: send the abnormal information to the control module through the communication unit based on the long-distance radio LORA; if the communication of the communication connection is blocked, the abnormal information is stored locally, and the abnormal information is retransmitted after the communication is restored.

[0066] The control module is configured to: determine circuit fault information corresponding to the load grounding point according to the abnormal information, and isolate the vehicle load according to the circuit fault information.

[0067] In the embodiment of the present invention, the monitoring module and the control module can establish a communication connection through wireless or wired means. Figure 3 As shown, the control module may also have a built-in communication unit. The communication unit in the monitoring module and the communication unit in the control module may communicate based on LORA to transmit abnormal information of the grounding point to the control module.

[0068] After receiving the abnormal information, the control module can determine whether there is a fault in the load and circuit corresponding to the grounding point based on the abnormal information, and generate corresponding circuit fault information if there is a fault. The control module can be deployed in the power distribution assembly, or the control module can be connected to the power distribution assembly for communication. If there is a fault, the control module can send an isolation instruction to the power distribution assembly based on the circuit fault information, so that the power distribution assembly can stop supplying power to the corresponding on-board load according to the instruction and isolate the load. For example, if the real-time current of the grounding point of a certain on-board load exceeds the upper limit of the reference interval, the control module can determine that a short circuit fault has occurred based on the abnormal information reported by the detection module, and generate a short-circuit-related fault code as circuit fault information.

[0069] In some possible implementations, an isolation unit may be provided in the power distribution assembly, which may be a blocking switch for the power supply line of the vehicle load. When the control module determines that there is a fault based on the grounding point current of a certain vehicle load, it may send an instruction to the power distribution assembly, and the power distribution assembly uses the blocking switch to cut off the power supply of the vehicle load.

[0070] The ground protection device provided in an embodiment of the present invention includes a control module and a monitoring module. The monitoring module can collect real-time current at the load grounding point and report abnormal information. The control module can isolate the load corresponding to the monitoring module based on the information reported by the monitoring module, preventing the faulty circuit from affecting other loads and ensuring the overall stability of the vehicle power system. The monitoring module can collect high-frequency current data at the grounding point in real time, thereby breaking through the static detection limitations of voltage impedance measurement and detecting circuit faults that only exist during dynamic vehicle operation, thereby improving the detection rate of intermittent faults in the vehicle power system. It can also detect faults related to high-frequency impedance and improve detection accuracy.

[0071] In one embodiment, when the control module determines circuit fault information corresponding to the load grounding point based on the abnormal information, the control module is specifically configured to:

[0072] Determine whether there is shunt in the circuit corresponding to the load grounding point;

[0073] If there is shunt, generating first type circuit fault information according to the abnormal information and the current of the circuit adjacent to the load grounding point;

[0074] If there is no shunt, the second type of circuit fault information is generated according to the abnormal information.

[0075] In an embodiment of the present invention, after the control module receives the grounding point abnormality information reported by the monitoring module, it can determine the fault cause of the abnormal current at the grounding point based on the abnormal information. First, it can determine whether there is a shunt at the grounding point to determine whether the current abnormality is caused by a load fault or a shunt.

[0076] For example, the lower limit of the reference interval of a load grounding point is 0.3A. The monitoring module collects the real-time current at the load grounding point and finds that it is less than 0.3A and reports it to the control module. The control module can first determine whether there is a shunt in the circuit corresponding to the load grounding point. If there is no shunt, the current abnormality may be a fault caused by poor contact of the vehicle-mounted load. If there is a shunt, it may be a fault caused by other shunt loads in the circuit.

[0077] Different protection measures are required for faults caused by shunt and non-shunt. Non-shunt faults (such as poor load contact) may require the control module to immediately isolate the corresponding onboard load, while shunt faults can delay isolation to prioritize vehicle operation. This allows the control module to distinguish between different types of circuit faults and implement protective measures more appropriate for the vehicle's current state.

[0078] In some possible implementations, determining whether a shunt exists in the circuit corresponding to the load grounding point can be achieved by detecting whether the phase of the real-time current at the load grounding point is correct. For example, the presence of a shunt can be determined based on the phase difference between the real-time current at the load grounding point and the current in the adjacent circuit, or based on the phase difference between the real-time current at the load grounding point and the given voltage of the vehicle load.

[0079] Exemplarily, the target voltage and reference phase difference of the vehicle load can be obtained; the phase difference between the target voltage and the real-time current is calculated. If the calculated phase difference is consistent with the reference phase difference, there is no shunt; if not, there is shunt.

[0080] In one embodiment, the abnormal information includes current abnormality data and a cyclic redundancy check code. When the control module determines the circuit fault information corresponding to the load grounding point based on the abnormal information, the control module is specifically configured to:

[0081] Verify whether the cyclic redundancy check code is correct based on the abnormal current data. If correct, generate circuit fault information based on the abnormal current data.

[0082] The abnormal current data may include the real-time current at the load grounding point and the comparison result with the reference interval. A cyclic redundancy check (CRC) is an algorithm that can generate a short fixed-bit check code based on data.

[0083] In an embodiment of the present invention, the monitoring module can generate a CRC code based on the current abnormality data, and the control module can perform verification based on the CRC code in the abnormal information. If the verification fails, there is no need to analyze the fault. If the verification passes, the fault type is determined based on the current abnormality data in the abnormal information, and a fault code corresponding to the fault type is generated as circuit fault information.

[0084] In the above embodiment, CRC check can avoid interference of false information reporting on the control module, thereby improving the decision accuracy of the control module.

[0085] In one embodiment, the monitoring module has a built-in acceleration sensor, and the monitoring module is further configured to:

[0086] The vibration intensity of the load grounding point is collected by an acceleration sensor; and the upper limit value and / or the lower limit value of the reference interval are corrected according to the vibration intensity.

[0087] A vehicle may experience severe vibrations while driving, which may cause current fluctuations in the vehicle's power system or sensor readings. If these fluctuations are not distinguished, normal fluctuations caused by vibrations may be mistaken for vehicle load failures.

[0088] To address this situation, an embodiment of the present invention deploys an accelerometer within the monitoring module. The real-time acceleration captured by the accelerometer is used to characterize the current vibration intensity at the load grounding point. The current threshold within the reference interval is then modified based on the vibration intensity, and the current at the load grounding point is then determined to be within the modified reference interval. Deploying the accelerometer allows for dynamic tuning of the reference interval, resolving false triggering issues caused by vehicle turbulence.

[0089] For example, during vehicle driving, if the reading of the acceleration sensor in the monitoring module is 5g, indicating that the acceleration at this time reaches 5 times the acceleration of gravity, the reference interval can be corrected according to the pre-calibrated data. For example, the lower limit value of the reference interval can be modified to 1.5 times the original value. The monitoring module can determine whether the real-time current of the load grounding point is abnormal based on the corrected reference interval.

[0090] In one embodiment, the monitoring module includes an isolation unit configured to:

[0091] If the real-time current collected by the monitoring module for multiple consecutive cycles is not within the reference range, the circuit corresponding to the load grounding point is shut down.

[0092] In an embodiment of the present invention, the monitoring module may include an isolation unit deployed in the circuit corresponding to the load grounding point. The isolation unit may be a blocking switch. The monitoring module may actively cut off the circuit corresponding to the load grounding point in some emergency situations.

[0093] For example, if some types of vehicle loads are short-circuited, it may seriously affect the safety of the vehicle, and the control module may delay isolating the short-circuited vehicle load due to communication abnormalities and other reasons. The monitoring module can cut off the current of the circuit where the vehicle load is located through the isolation unit when it detects that the real-time current of the grounding point is greater than the upper limit of the reference interval for three consecutive cycles, thereby ensuring vehicle safety.

[0094] In one embodiment, when isolating the vehicle-mounted load, the control module is specifically configured to:

[0095] Determine whether the current vehicle speed is greater than the safe speed. If so, reduce the voltage of the on-board load and reduce the vehicle speed. When the current vehicle speed drops below the safe speed, stop supplying power to the on-board load.

[0096] Some types of on-board loads can directly affect vehicle operation. For example, a sudden power loss to a motor controller can cause vehicle instability. In an embodiment of the present invention, when a circuit fault occurs in the circuit containing such an on-board load and the control module needs to isolate the load, it can first determine whether the current vehicle speed exceeds a preset safety speed. If so, the load voltage is reduced to operate at low power. Once the vehicle speed drops below the safety speed, power is then removed from the load, effectively isolating the load.

[0097] In the above embodiment, the segmented strategy of graded voltage reduction, speed limit and power off can avoid vehicle instability caused by direct power off of the onboard load during high-speed driving, thereby improving vehicle safety.

[0098] In one embodiment, a vehicle-mounted power supply system is further provided, comprising a vehicle-mounted power supply, a vehicle-mounted load, and a grounding protection device as in any of the above embodiments.

[0099] In one embodiment, a grounding protection method for a vehicle-mounted power system is also provided.

[0100] Figure 4 The flow chart of a ground protection method provided by an exemplary embodiment of the present invention is as follows. The ground protection method can be applied to the control module in the ground protection device of any of the above embodiments, such as Figure 4 As shown, the method may include:

[0101] Step S401: receiving abnormal information of a load grounding point reported by a monitoring module in a grounding protection device.

[0102] The abnormal information is reported by the monitoring module when it determines that the collected real-time current of the corresponding load grounding point is not within the reference range.

[0103] Step S402: determining circuit fault information corresponding to the load grounding point according to the abnormal information.

[0104] Step S403: Isolate the vehicle load according to the circuit fault information.

[0105] For example, the vehicle power system's power distribution assembly can be deployed in the vehicle's PDU (Power Distribution Unit, high-voltage distribution box). The power distribution assembly can distribute power to onboard loads such as the vehicle power system's battery management system, motor controller, and onboard charger. The ground protection device can include a control module deployed in the power distribution assembly and a monitoring module deployed at the motor controller's grounding point. The control module may also include an isolation unit and an alarm unit.

[0106] The experimental process for this example includes:

[0107] S51: The monitoring module detects that the current at the motor controller grounding point is lower than 0.3A for 3 seconds and sends the abnormal information to the control module in the power distribution assembly via the LoRa protocol.

[0108] S52: The control module checks the CRC in the abnormal information, generates a fault code, and performs the following linkage operations:

[0109] S521, the isolation unit cuts off the power supply to the motor controller;

[0110] S522, the alarm unit sends the fault code to the vehicle computer or instrument panel for display, and pushes the alarm information to the vehicle owner's terminal;

[0111] S53, the vehicle computer or the vehicle owner terminal retrieves the three-dimensional electrical positioning structure diagram of the fault point according to the fault code.

[0112] The test results show that the monitoring module's detection sensitivity is 0.2A, the ground fault protection device's fault response time is 28ms, and the false alarm rate is less than 0.01 times per thousand hours (after 3,000 hours of road testing). These results indicate that the ground fault protection device and method provided by the present invention can improve the detection sensitivity of the docking location status, accelerate the fault response time, and reduce the false alarm rate.

[0113] In addition, unless otherwise specified, the functional units / modules in the various embodiments of the present invention may be integrated into a single unit / module, each unit / module may exist physically separately, or two or more units / modules may be integrated together. The aforementioned integrated units / modules may be implemented in the form of hardware or software program modules.

[0114] Figure 5 FIG1 is a schematic diagram of the structure of an electronic device provided by an exemplary embodiment of the present invention. Figure 5 As shown, the electronic device 500 includes:

[0115] Processor 5001, memory 5002, and communication interface 5003;

[0116] The memory 5002 is used to store executable instructions of the processor 5001; the executable instructions may be computer-executable instructions;

[0117] The processor 5001 is configured to execute the technical solution in the aforementioned method embodiment by executing the executable instructions.

[0118] Optionally, the memory 5002 can be independent or integrated with the processor 5001.

[0119] Optionally, when the memory 5002 is a device independent of the processor 5001, the electronic device 5000 may further include:

[0120] The bus 5004 , the memory 5002 and the communication interface 5003 are connected to the processor 5001 via the bus 5004 and communicate with each other. The communication interface 5003 is used to communicate with other devices.

[0121] Optionally, the communication interface 5003 may be implemented using a transceiver. The communication interface is used to enable communication between the database access device and other devices (e.g., a client, a read-write library, and a read-only library). The memory may include random access memory (RAM) and may also include non-volatile memory (non-volatile memory), such as at least one disk storage device.

[0122] Bus 5004 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. Buses can be categorized as address buses, data buses, and control buses. For ease of illustration, the figure shows only one line, but this does not imply that there is only one bus or only one type of bus.

[0123] The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, and discrete hardware components.

[0124] The electronic device is used to execute the technical solution in any of the aforementioned method embodiments, and its implementation principles and technical effects are similar and will not be repeated here.

[0125] An embodiment of the present invention further provides a readable storage medium, which may be a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the technical solution provided by any of the aforementioned method embodiments is implemented.

[0126] An embodiment of the present invention further provides a computer program product, including a computer program, which is used to implement the technical solution provided by any of the aforementioned method embodiments when executed by a processor.

[0127] Those skilled in the art will appreciate that all or part of the steps in the above-described method embodiments can be implemented using hardware associated with program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0128] In the above embodiments, the description of each embodiment has its own emphasis. For parts not described in detail in a particular embodiment, please refer to the relevant description of other embodiments. The technical features of the above embodiments can be combined in any way. To keep the description concise, 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.

[0129] Other embodiments of the present invention will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

[0130] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A grounding protection device for a vehicle-mounted power supply system, characterized in that: The vehicle-mounted power supply system includes a vehicle-mounted power supply and a vehicle-mounted load, and the vehicle-mounted load corresponds to a load grounding point in the vehicle-mounted power supply system; The ground protection device includes: a control module and a monitoring module deployed at the load grounding point, wherein the control module is in communication with the monitoring module, wherein: The monitoring module is configured to: collect the real-time current of the corresponding load grounding point and determine whether the real-time current is within a reference interval; if not, report abnormal information of the load grounding point to the control module; The control module is configured to determine circuit fault information corresponding to the load grounding point according to the abnormal information, and isolate the vehicle-mounted load according to the circuit fault information.

2. The device according to claim 1, characterized in that When the control module determines the circuit fault information corresponding to the load grounding point according to the abnormal information, the control module is specifically configured to: Determining whether there is a shunt in the circuit corresponding to the load grounding point; If there is shunt, generating first type of circuit fault information according to the abnormal information and the current of the circuit adjacent to the load grounding point; If there is no diversion, a second type of circuit fault information is generated according to the abnormal information.

3. The device according to claim 2, characterized in that Determining whether there is current shunting in the circuit corresponding to the load grounding point includes: Obtaining a target voltage and a reference phase difference of the vehicle-mounted load; The phase difference between the target voltage and the real-time current is calculated. If the calculated phase difference is consistent with the reference phase difference, no shunt occurs. If not, shunt occurs.

4. The device according to any one of claims 1 to 3, characterized in that The abnormal information includes current abnormality data and a cyclic redundancy check code. When the control module determines the circuit fault information corresponding to the load grounding point according to the abnormal information, the control module is specifically configured to: Verify whether the cyclic redundancy check code is correct according to the abnormal current data; if correct, generate circuit fault information according to the abnormal current data.

5. The device according to any one of claims 1 to 3, characterized in that The monitoring module has a built-in acceleration sensor, and the monitoring module is further configured to: collecting the vibration intensity of the load grounding point by the acceleration sensor; The upper limit value and / or the lower limit value of the reference interval are modified according to the vibration intensity.

6. The device according to any one of claims 1 to 3, characterized in that The monitoring module includes an isolation unit, which is configured to: If the real-time current collected by the monitoring module for multiple consecutive cycles is not within the reference range, the circuit corresponding to the load grounding point is turned off.

7. The device according to any one of claims 1 to 3, characterized in that When isolating the vehicle-mounted load, the control module is specifically configured to: Determining whether the current vehicle speed is greater than a safe speed, and if so, reducing the voltage of the vehicle load and reducing the vehicle speed; When the current vehicle speed decreases to less than a safe speed, power supply to the vehicle load is stopped.

8. The device according to any one of claims 1 to 3, characterized in that The monitoring module has a built-in communication unit. When reporting abnormal information to the control module, the monitoring module is specifically configured to: Sending abnormal information to the control module through the communication unit based on long-distance radio LORA; If the communication of the communication connection is blocked, the abnormal information is stored locally and retransmitted after the communication is restored.

9. A grounding protection method for a vehicle-mounted power supply system, characterized in that: A control module applied to a grounding protection device according to any one of claims 1 to 8, wherein the grounding protection method comprises: receiving abnormal information of a load grounding point reported by a monitoring module in the grounding protection device, wherein the abnormal information is reported by the monitoring module when determining that the collected real-time current of the corresponding load grounding point is not within a reference interval; Determining circuit fault information corresponding to the load grounding point based on the abnormal information; The vehicle-mounted load is isolated according to the circuit fault information.

10. An on-vehicle power supply system, comprising an on-vehicle power supply, an on-vehicle load, and the grounding protection device according to any one of claims 1 to 8.

Images