Vehicle low-voltage auxiliary power supply equipment protection method and related device

Abstract

The invention discloses a vehicle low-voltage auxiliary power supply equipment protection method and a related device, and relates to the technical field of low-voltage auxiliary power supply equipment protection. Determining a first current threshold value, a first voltage threshold value and a first temperature threshold value of the vehicle low-voltage auxiliary power supply equipment based on the historical abnormal data, obtaining current change data, voltage change data and temperature change data of the vehicle low-voltage auxiliary power supply equipment, and determining a corresponding first optimization factor, a second optimization factor and a third optimization factor, and the first current threshold value, the first voltage threshold value and the first temperature threshold value are optimized based on the multiple optimization factors to obtain a second current threshold value, a second voltage threshold value and a second temperature threshold value, and the intelligent fuse is controlled to work based on the second current threshold value, the second voltage threshold value and the second temperature threshold value. By adopting the embodiment of the invention, the safety of the vehicle low-voltage auxiliary power supply equipment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage auxiliary power supply equipment protection, and in particular to a vehicle low-voltage auxiliary power supply equipment protection method and related devices. Background Art

[0002] In the complex electrical architecture of modern cars, the vehicle's low-voltage auxiliary power supply equipment plays a vital role. It provides a stable and reliable power supply for many low-voltage electrical equipment in the vehicle, such as lighting systems, on-board entertainment equipment, various sensors, and electronic control systems. As the core component of the vehicle's low-voltage auxiliary power supply equipment protection system, the performance and application of smart fuses are of great significance to ensuring the safe and stable operation of the entire electrical system. Traditional fuses mainly work based on a simple overcurrent fusing principle. When the current in the circuit exceeds its rated value to a certain extent, the fuse fuse melts, thereby cutting off the circuit and playing a protective role. However, the protection performance of traditional fuses is not high, resulting in low safety of vehicle low-voltage auxiliary power supply equipment. Therefore, how to improve the safety of vehicle low-voltage auxiliary power supply equipment is an urgent problem to be solved. Summary of the invention

[0003] The embodiments of the present application provide a method and a related device for protecting low-voltage auxiliary power equipment of a vehicle, thereby improving the safety of the low-voltage auxiliary power equipment of the vehicle.

[0004] In a first aspect, an embodiment of the present application provides a vehicle low-voltage auxiliary power supply equipment protection method, which is applied to a vehicle low-voltage auxiliary power supply equipment protection system, wherein the vehicle low-voltage auxiliary power supply equipment protection system includes an intelligent fuse and a vehicle low-voltage auxiliary power supply equipment, and the method includes: Acquiring historical abnormal data of the vehicle low-voltage auxiliary power supply device within a preset historical time period; determining a first current threshold, a first voltage threshold, and a first temperature threshold of the vehicle low-voltage auxiliary power device based on the historical abnormal data; Acquire current change data, voltage change data and temperature change data of the vehicle low-voltage auxiliary power supply device within the preset historical time period; Determine a first optimization factor corresponding to the current change data, a second optimization factor corresponding to the voltage change data, and a third optimization factor corresponding to the temperature change data; Optimizing the first current threshold based on the first optimization factor to obtain a second current threshold; Optimizing the first voltage threshold based on the second optimization factor to obtain a second voltage threshold; Optimizing the first temperature threshold based on the third optimization factor to obtain a second temperature threshold; The smart fuse is controlled to perform an operation of cutting off power to the vehicle low-voltage auxiliary power device based on the second current threshold, the second voltage threshold, and the second temperature threshold.

[0005] In a second aspect, an embodiment of the present application provides a vehicle low-voltage auxiliary power supply equipment protection device, which is applied to a vehicle low-voltage auxiliary power supply equipment protection system, wherein the vehicle low-voltage auxiliary power supply equipment protection system includes an intelligent fuse and a vehicle low-voltage auxiliary power supply equipment, and the device includes: an acquisition unit and a processing unit; The acquisition unit is used to acquire historical abnormal data of the vehicle low-voltage auxiliary power supply device within a preset historical time period; The processing unit is used to determine a first current threshold, a first voltage threshold and a first temperature threshold of the vehicle low-voltage auxiliary power supply device based on the historical abnormal data; Acquire current change data, voltage change data and temperature change data of the vehicle low-voltage auxiliary power supply device within the preset historical time period; Determine a first optimization factor corresponding to the current change data, a second optimization factor corresponding to the voltage change data, and a third optimization factor corresponding to the temperature change data; Optimizing the first current threshold based on the first optimization factor to obtain a second current threshold; Optimizing the first voltage threshold based on the second optimization factor to obtain a second voltage threshold; Optimizing the first temperature threshold based on the third optimization factor to obtain a second temperature threshold; The smart fuse is controlled to perform an operation of cutting off power to the vehicle low-voltage auxiliary power device based on the second current threshold, the second voltage threshold, and the second temperature threshold.

[0006] In a third aspect, an embodiment of the present application provides an electronic device, comprising: a processor, a memory, a communication interface, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the processor so that the electronic device executes the method of the first aspect.

[0007] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement the method of the first aspect.

[0008] In a fifth aspect, an embodiment of the present application provides a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, so that a computer executes the method of the first aspect.

[0009] The implementation of the present application has the following beneficial effects: It can be seen that the vehicle low-voltage auxiliary power supply equipment protection method described in the embodiment of the present application is applied to a vehicle low-voltage auxiliary power supply equipment protection system, wherein the vehicle low-voltage auxiliary power supply equipment protection system includes an intelligent fuse and a vehicle low-voltage auxiliary power supply equipment. First, historical abnormal data of the vehicle low-voltage auxiliary power supply equipment within a preset historical time period is obtained, and then the first current threshold, the first voltage threshold and the first temperature threshold of the vehicle low-voltage auxiliary power supply equipment are determined based on the historical abnormal data. Then, the current change data, the voltage change data and the temperature change data of the vehicle low-voltage auxiliary power supply equipment within the preset historical time period are obtained, and then the first optimization factor corresponding to the current change data, the second optimization factor corresponding to the voltage change data, and the third optimization factor corresponding to the temperature change data are determined. Then, the first current threshold is optimized based on the first optimization factor to obtain the second current threshold, and the first voltage threshold is optimized based on the second optimization factor to obtain the second voltage threshold, and the first temperature threshold is optimized based on the third optimization factor to obtain the second temperature threshold. Finally, the intelligent fuse is controlled based on the second current threshold, the second voltage threshold and the second temperature threshold to perform the operation of cutting off the power supply of the vehicle low-voltage auxiliary power supply equipment, thereby improving the safety of the vehicle low-voltage auxiliary power supply equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the implementation methods of the present application or the background technology, the drawings required for use in the implementation methods of the present application or the background technology will be described below.

[0011] Figure 1 It is a structural schematic diagram of a vehicle low-voltage auxiliary power supply equipment protection system provided by an embodiment of the present application; Figure 2 It is a flow chart of a vehicle low-voltage auxiliary power supply equipment protection method provided by an embodiment of the present application; Figure 3 is a flow chart for determining a load balancing degree provided by an embodiment of the present application; Figure 4 is an example diagram of a parallel load branch provided in an embodiment of the present application; Figure 5 is a flow chart of restoring power supply of a vehicle low-voltage auxiliary power supply device provided by an embodiment of the present application; Figure 6 is a flow chart for determining a stability value provided by an embodiment of the present application; Figure 7 It is a structural schematic diagram of a vehicle low-voltage auxiliary power supply equipment protection device provided in the application implementation method; Figure 8It is a structural schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0012] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the implementation mode of the present application. Obviously, the described implementation mode is only a part of the implementation mode of the present application, not all the implementation modes. Based on the implementation mode in the present application, all other implementation modes obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0013] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0014] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0015] First, the relevant terms involved in this application are explained: Vehicle low-voltage auxiliary power supply equipment: a system that provides power support for various low-voltage electrical equipment on the vehicle. It is mainly responsible for providing stable power to the non-critical or auxiliary equipment of the vehicle when the main power supply of the vehicle (such as the generator driven by the engine or the main battery) fails, during the startup phase or under specific working conditions, so as to ensure that these equipment can work normally and enhance the reliability and stability of the vehicle's electrical system. The vehicle low-voltage auxiliary power supply equipment is mainly composed of a low-voltage battery, a charging system, a power management module, a power distribution circuit, etc. The low-voltage battery is one of the core components of the low-voltage auxiliary power supply equipment, usually a lead-acid battery or a lithium-ion battery, which is used to store electrical energy. When the vehicle is started, it provides current to the starter motor. At the same time, during the operation of the vehicle, it provides power to the vehicle's low-voltage electrical equipment such as lights, audio, and on-board computers. When the main power supply system of the vehicle fails, the low-voltage battery can maintain the operation of the basic electrical equipment of the vehicle for a period of time so that the driver can take corresponding measures. The charging system includes the low-voltage charging circuit of the alternator or the on-board charger, etc. Its function is to convert the mechanical energy of the engine into electrical energy during the operation of the vehicle, charge the low-voltage battery, and ensure that the battery always maintains sufficient power. At the same time, the charging system can also control and adjust the charging process to prevent overcharging or undercharging from damaging the battery. The power management module is responsible for monitoring and managing the working status of the entire low-voltage power supply system. It monitors the voltage, current, temperature and other parameters of the low-voltage battery in real time through sensors, as well as the load of the vehicle's electrical system. According to the preset algorithms and strategies, it controls and adjusts the charging system, power distribution circuit, etc. to achieve reasonable distribution and utilization of electrical energy and improve the efficiency and reliability of the power system. The power distribution circuit distributes the electrical energy generated by the low-voltage auxiliary power supply equipment to various low-voltage electrical equipment in the vehicle. It is usually composed of various relays, fuses, wire harnesses, etc., and can reasonably distribute electrical energy and protect the circuit according to the power requirements and working status of different equipment. When the vehicle is operating normally, the engine drives the AC generator to run, and the AC generator generates AC power. After rectification and voltage stabilization, it directly supplies power to the vehicle's low-voltage electrical equipment on the one hand, and charges the low-voltage battery on the other hand. At this time, the power management module will adjust the charging current and power distribution in real time according to the power status of the low-voltage battery and the load of the electrical equipment to ensure the stable operation of the system. When the engine stops running or the main power system fails, the low-voltage battery becomes the only power source for the vehicle's low-voltage electrical equipment. The low-voltage battery supplies power to each device through the power distribution circuit to maintain the basic functions of the vehicle, such as interior lighting, door lock control, emergency alarm, etc. At the same time, the power management module will enter energy-saving mode to reduce the power of some non-essential equipment or cut off its power supply to extend the service life of the low-voltage battery.

[0016] See also Figure 1 , Figure 1It is a structural schematic diagram of a vehicle low-voltage auxiliary power supply equipment protection system provided in an embodiment of the present application. The vehicle low-voltage auxiliary power supply equipment protection system 100 includes an intelligent fuse 101 and a vehicle low-voltage auxiliary power supply equipment 102.

[0017] In this embodiment, the vehicle low-voltage auxiliary power supply equipment protection system 100 is a system for protecting the vehicle low-voltage auxiliary power supply equipment 102. Its function is to monitor and manage the operation status of the vehicle low-voltage auxiliary power supply equipment 102. When an abnormal situation (such as overcurrent, overvoltage, overheating, etc.) occurs, protective measures are taken in time to prevent equipment damage and ensure the safe and stable operation of the vehicle low-voltage electrical system. The intelligent fuse 101 is a circuit protection device with intelligent functions. Compared with traditional fuses, it can not only cut off the circuit when the circuit is overloaded or short-circuited, but also has some additional intelligent features. For example, it can monitor the current in the circuit in real time. When the current exceeds the set threshold, it can respond quickly and cut off the circuit. At the same time, it may also have fault diagnosis and alarm functions, and can even communicate with other electronic systems of the vehicle to transmit fault information to the central control unit of the vehicle or the driver so that timely measures can be taken. The vehicle low-voltage auxiliary power supply device 102 is a system in the vehicle that provides power support for various low-voltage electrical equipment. It stably provides power to the non-critical or auxiliary equipment of the vehicle when the main power supply of the vehicle fails, during the startup phase or under specific working conditions to ensure that these equipment can work normally and enhance the reliability and stability of the vehicle's electrical system. When the vehicle is operating normally, the engine drives the AC generator to operate, and the AC generator generates AC power. After rectification and voltage stabilization, it directly supplies power to the low-voltage electrical equipment of the vehicle on the one hand, and charges the low-voltage battery on the other hand. At this time, the power management module will adjust the charging current and power distribution in real time according to the power state of the low-voltage battery and the load of the electrical equipment to ensure the stable operation of the system. When the engine stops running or the main power supply system fails, the low-voltage battery becomes the only power source for the low-voltage electrical equipment of the vehicle. The low-voltage battery supplies power to various devices through the power distribution circuit to maintain the basic functions of the vehicle, such as interior lighting, door lock control, emergency alarm, etc. At the same time, the power management module will enter the energy-saving mode to reduce the power of some non-essential equipment or cut off its power supply to extend the service life of the low-voltage battery.

[0018] See also Figure 2 , Figure 2 This is a flow chart of a vehicle low-voltage auxiliary power supply equipment protection method provided by an embodiment of the present application, including but not limited to the following steps: S201: Acquire historical abnormal data of the vehicle low-voltage auxiliary power supply device within a preset historical time period.

[0019] In this embodiment, data generated when abnormal conditions occur in the low-voltage auxiliary power supply equipment of the vehicle within a preset past period of time, that is, within a preset historical period of time, is collected from the relevant data recording system of the vehicle. These abnormal data may include various data information when equipment fails, performance is abnormal, or operating parameters exceed the normal range, such as abnormal values ​​of parameters such as current, voltage, and temperature, as well as related fault codes, timestamps, and other information.

[0020] S202: Determine a first current threshold, a first voltage threshold, and a first temperature threshold of the vehicle low-voltage auxiliary power device based on the historical abnormal data.

[0021] In this embodiment, exemplarily, n abnormal moments and n current values, n voltage values, and n temperature values ​​corresponding to the n abnormal moments are determined based on the historical abnormal data, wherein n is an integer greater than 1. Specifically, the abnormal moments of the vehicle's low-voltage auxiliary power supply device within a preset historical time period are determined to obtain n abnormal moments, and then the current, voltage, and temperature corresponding to each of the n abnormal moments of the vehicle's low-voltage auxiliary power supply device are determined to obtain n current values, n voltage values, and n temperature values.

[0022] Exemplarily, the average value of the n current values ​​is determined to obtain the current average value. Specifically, the current values ​​corresponding to the n abnormal moments extracted previously are added and then divided by n to obtain the current average value. This average value can represent the overall level of current of the device under abnormal conditions to a certain extent.

[0023] Exemplarily, the line resistance of the vehicle's low-voltage auxiliary power supply device is obtained. Specifically, since the line resistance will affect the current size when the vehicle's low-voltage auxiliary power supply device is working normally, and thus affect the determination of the current threshold, the larger the line resistance, the smaller the current change under the same voltage change. Therefore, when determining the current threshold, it is necessary to consider the influence of the line resistance, so firstly, it is necessary to obtain the line resistance of the vehicle's low-voltage auxiliary power supply device.

[0024] Exemplarily, determining a first fine-tuning parameter corresponding to the line resistance may specifically be a mapping relationship between a preset line resistance and a fine-tuning parameter, and based on the mapping relationship, the first fine-tuning parameter corresponding to the line resistance may be determined.

[0025] Exemplarily, the current average value is adjusted based on the first fine-tuning parameter to obtain the first current threshold. Specifically, the first current threshold is calculated according to the following formula: The first current threshold = current average value × (1 + first fine-tuning parameter); According to the above formula, the current average value can be adjusted based on the first fine-tuning parameter to obtain the first current threshold.

[0026] Exemplarily, the average value of the n voltage values ​​is determined to obtain the voltage average value. Specifically, the voltage values ​​corresponding to the n abnormal moments extracted previously are added and then divided by n to obtain the voltage average value. This average value can represent the overall voltage level of the equipment under abnormal conditions to a certain extent.

[0027] Exemplarily, the load balance degree of the vehicle low-voltage auxiliary power supply device is determined. Specifically, refer to Figure 3 , Figure 3 A flow chart for determining a load balancing degree provided in an embodiment of the present application includes but is not limited to the following steps: S301: Determine m parallel load branches corresponding to the vehicle low-voltage auxiliary power supply device.

[0028] In this embodiment, m is an integer greater than 1.

[0029] The vehicle low voltage auxiliary power supply device is usually connected to multiple loads, which are connected in parallel in the circuit. Figure 4 , Figure 4 is an example diagram of a parallel load branch provided in an embodiment of the present application. Figure 4 In the embodiment, taking the first load 1 and the second load 2 as an example, the voltages at both ends of the first load 1 and the second load 2 are equal, and both are equal to the voltage of the vehicle's low-voltage auxiliary power supply. The first load 1 and the second load 2 can work independently without interfering with each other. In actual operation, there are more load branches that can be connected in parallel. In this embodiment, the branch where the first load 1 and the second load 2 are located is used as an example for explanation. It should be explained that the total current is equal to the sum of the currents of each branch. The current in each branch is only related to the resistance (or impedance) of the branch and the voltage of the vehicle's low-voltage auxiliary power supply, and does not affect each other. That is to say, when the load of a branch changes (such as increasing or decreasing resistance), only the current of the branch will change, and the current of other branches will not be affected. When a branch has a circuit breaker fault, other branches can still work normally, and the entire circuit will not be completely paralyzed. However, if a branch has a short circuit fault, it will cause the current of the entire circuit to be too large, which may damage the power supply or other components.

[0030] S302: Obtain a voltage drop corresponding to each of the m parallel load branches to obtain m voltage drops.

[0031] In this embodiment, in a parallel circuit, the voltage drop across each load branch is different, which depends on factors such as the resistance of the load in the branch. The voltage drop corresponding to each parallel load branch is obtained, and m voltage drop data are obtained. These data reflect the voltage changes of each load branch during operation and are an important basis for subsequent analysis of load balance.

[0032] S303: Determine standard deviations corresponding to the m voltage drops.

[0033] In this embodiment, the standard deviation is a statistic used to measure the degree of discreteness of a set of data. The m voltage drop data obtained previously are taken as a data set, and their standard deviation is calculated using a specific formula. The larger the standard deviation, the greater the degree of discreteness of this set of voltage drop data, that is, the greater the difference in voltage drops of each load branch; the smaller the standard deviation, the more concentrated the voltage drop data is, and the smaller the difference in voltage drops of each load branch is.

[0034] S304: Determine a load balance degree corresponding to the standard deviation; the larger the standard deviation is, the smaller the load balance degree of the vehicle low-voltage auxiliary power supply device is.

[0035] In this embodiment, since the standard deviation reflects the degree of discreteness of the voltage drop of each load branch, and the difference in voltage drop reflects the imbalance of load distribution to a certain extent, the larger the standard deviation, the greater the difference in voltage drop of each load branch, the more unbalanced the load distribution, and the smaller the load balance of the vehicle's low-voltage auxiliary power supply equipment. Conversely, the smaller the standard deviation, the greater the load balance. In this way, a corresponding relationship between the standard deviation and the load balance is established, so that the load balance status of the vehicle's low-voltage auxiliary power supply equipment can be quantitatively evaluated based on the standard deviation of the voltage drop.

[0036] In this implementation, it may be a mapping relationship between a preset standard deviation and a load balancing degree, and the load balancing degree corresponding to the standard deviation may be determined based on the mapping relationship.

[0037] It can be seen that by calculating the standard deviation of the voltage drop of each parallel load branch to determine the load balance, the balance degree of load distribution can be accurately quantified. Because the voltage drop is directly related to the load size, the difference in voltage drop of each branch can intuitively reflect the unevenness of load distribution. The standard deviation quantifies this difference, thereby accurately reflecting the load balance of the entire system and timely discovering abnormal load distribution. When the standard deviation is large, that is, the load balance is small, it means that the voltage drop of each load branch is very different, and some loads may be too heavy or too light. The quantification result of the load balance can provide data support for the optimal design of the vehicle's low-voltage auxiliary power supply equipment. Designers can adjust the circuit layout, optimize the load distribution plan, or select appropriate power supply equipment parameters according to the load balance situation to improve the overall performance and efficiency of the system, ensure that each load can operate within a reasonable working range, and extend the service life of the equipment. The standard deviation is a standardized statistic with clear numerical meaning and comparability. Low-voltage auxiliary power supply equipment in different vehicles or under different operating conditions can obtain the load balance by calculating the standard deviation of its voltage drop, thereby making intuitive comparisons and evaluations.

[0038] Exemplarily, determining a second fine-tuning parameter corresponding to the load balancing degree may specifically be a mapping relationship between a preset load balancing degree and a fine-tuning parameter, and based on the mapping relationship, determining the second fine-tuning parameter corresponding to the load balancing degree may be performed.

[0039] Exemplarily, the voltage average value is adjusted based on the second fine-tuning parameter to obtain the first voltage threshold, and the first voltage threshold is calculated specifically according to the following formula: The first voltage threshold = voltage average × (1 + second fine-tuning parameter); According to the above formula, the voltage average value can be adjusted based on the second fine-tuning parameter to obtain the first voltage threshold.

[0040] Exemplarily, the average value of the n temperature values ​​is determined to obtain the temperature average value. Specifically, the temperature values ​​corresponding to the n abnormal moments extracted previously are added and then divided by n to obtain the temperature average value. This average value can represent the overall temperature level of the equipment under abnormal conditions to a certain extent.

[0041] Exemplarily, the average ambient temperature corresponding to the n abnormal moments is obtained. Specifically, the ambient temperature will affect the temperature of the device. The ambient temperature data corresponding to the n abnormal moments are collected, and the average value of these ambient temperatures is calculated. This helps to more accurately analyze the relationship between the temperature change of the device itself and environmental factors.

[0042] Exemplarily, determining a third fine-tuning parameter corresponding to the average ambient temperature may specifically be a mapping relationship between a preset ambient temperature and a fine-tuning parameter, and based on the mapping relationship, the third fine-tuning parameter corresponding to the average ambient temperature may be determined.

[0043] Exemplarily, the temperature average value is adjusted based on the third fine-tuning parameter to obtain the first temperature threshold. Specifically, the first temperature threshold is calculated according to the following formula: The first temperature threshold = the average temperature × (1 + the third fine-tuning parameter); According to the above formula, the temperature average value can be adjusted based on the third fine-tuning parameter to obtain the first temperature threshold.

[0044] It can be seen that by extracting the current, voltage and temperature values ​​corresponding to n abnormal moments from the historical abnormal data, the data source can be focused on the scene where the equipment has problems. Based on these abnormal data, the characteristics of each parameter of the equipment in the abnormal state can be more accurately grasped, and the average values ​​of n current values, voltage values ​​and temperature values ​​can be calculated respectively, which can reduce the influence of accidental factors to a certain extent. Because the data at a single abnormal moment may be affected by instantaneous interference or special circumstances, the average value can integrate the data at multiple abnormal moments and more stably represent the general level of each parameter of the equipment in the abnormal state. Line resistance will affect the current. Different line resistances will lead to different current values ​​at the same voltage. Determining the first fine-tuning parameter corresponding to the line resistance and adjusting the current average value can make the first current threshold more consistent with the actual circuit situation. The load balance reflects the uniformity of the load distribution of the vehicle's low-voltage auxiliary power supply equipment. Load imbalance will cause voltage fluctuations. If the load balance is not considered, the voltage threshold setting may be unreasonable. The voltage average value is adjusted by determining the second fine-tuning parameter corresponding to the load balance. The ambient temperature has an important impact on the temperature of the device itself. Under different ambient temperatures, the temperature range of the device during normal operation will also be different. The average ambient temperature corresponding to n abnormal moments is obtained, and the corresponding third fine-tuning parameter is determined to adjust the temperature average value. The first current threshold, the first voltage threshold and the first temperature threshold obtained after the above comprehensive consideration and adjustment can more accurately determine whether the vehicle's low-voltage auxiliary power supply equipment is in an abnormal state. When the actual operating parameters of the device exceed these thresholds, it can be discovered in time and corresponding protection measures can be taken, such as controlling the intelligent fuse to cut off the power supply to avoid damage to the device due to abnormal operation, thereby improving the reliability of the entire system.

[0045] S203: Acquire current change data, voltage change data, and temperature change data of the vehicle low-voltage auxiliary power supply device within the preset historical time period.

[0046] In this embodiment, in addition to paying attention to the abnormal data itself, it is also necessary to obtain the changes in the current, voltage and temperature of the device over time within a preset historical time period. These change data can reflect the dynamic change law of the parameters of the device under normal and abnormal conditions, such as the current fluctuation range, the rising or falling trend of the voltage, the temperature change rate, etc. By analyzing these change data, the operating characteristics of the equipment can be more comprehensively understood, so the current change data, voltage change data and temperature change data of the vehicle low-voltage auxiliary power supply device within the preset historical time period are obtained.

[0047] S204: Determine a first optimization factor corresponding to the current change data, a second optimization factor corresponding to the voltage change data, and a third optimization factor corresponding to the temperature change data.

[0048] In this embodiment, exemplarily, fitting is performed based on the current change data to obtain a current change straight line. Specifically, fitting methods such as the least squares method, the gradient descent method, and the polynomial fitting method can be used for fitting. Through the above methods, based on the determined current change data, a straight line that can describe its change trend, i.e., the current change straight line, can be fitted, thereby providing a basis for subsequent analysis of the current change law and determination of related parameters.

[0049] Exemplarily, fitting is performed based on the voltage change data to obtain a voltage change straight line. Specifically, fitting can also be performed using fitting methods such as the least squares method, the gradient descent method, and the polynomial fitting method. Through the above methods, based on the determined voltage change data, a straight line that can describe its change trend, i.e., the voltage change straight line, can be fitted, thereby providing a basis for subsequent analysis of voltage change laws and determination of related parameters.

[0050] Exemplarily, fitting is performed based on the temperature change data to obtain a temperature change straight line. Specifically, fitting can also be performed using fitting methods such as the least squares method, the gradient descent method, and the polynomial fitting method. Through the above methods, based on the determined temperature change data, a straight line that can describe its change trend, i.e., the temperature change straight line, can be fitted, thereby providing a basis for subsequent analysis of temperature change laws and determination of related parameters.

[0051] Exemplarily, the first slope corresponding to the current change line, the second slope corresponding to the voltage change line, and the third slope corresponding to the temperature change line are determined. Specifically, for each fitted straight line, the slope is a key parameter, and the slope represents the degree of inclination of the straight line. In this embodiment, the current change line, the voltage change line, and the temperature change line respectively reflect the rate of change of the current, voltage, and temperature over time. The first slope represents the rate of change of the current over time, the second slope represents the rate of change of the voltage over time, and the third slope represents the rate of change of the temperature over time. By calculating these slopes, we can quantify the speed of change of the parameters. For example, a larger slope means that the parameter has a larger change in a short time.

[0052] Exemplarily, a mapping relationship between the slope of the fitted line and the optimization factor is obtained. Specifically, the optimization factor is an important parameter for adjusting the device parameter threshold, and there is a certain correlation between it and the slope of the fitted line. The mapping relationship can be predetermined by experiments, data analysis, or machine learning. For example, through the analysis of a large amount of historical data, it is found that the larger the slope, the larger the corresponding optimization factor, indicating that the faster the parameter changes, the greater the impact on the judgment of device abnormality. This mapping relationship can be expressed in the form of a function, a table, or a model.

[0053] Exemplarily, the first optimization factor corresponding to the first slope, the second optimization factor corresponding to the second slope, and the third optimization factor corresponding to the third slope are determined based on the mapping relationship. Specifically, after the slope of the fitted straight line and the mapping relationship are obtained, the optimization factor corresponding to each slope can be determined according to the mapping relationship. The first slope is substituted into the mapping relationship to obtain the first optimization factor corresponding thereto. Similarly, the second optimization factor corresponding to the second slope and the third optimization factor corresponding to the third slope are obtained.

[0054] It can be seen that by fitting the current, voltage and temperature change lines and determining their slopes, the changing trends of these physical quantities over time can be quantified. The slope reflects the rate of change. For example, the slope of the current change line can indicate how fast the current increases or decreases over time, which helps to more accurately understand the operating status of the vehicle's low-voltage auxiliary power supply equipment and the changing characteristics of these parameters at different times. Converting complex current, voltage and temperature change data into the slope of a line makes the data more concise and intuitive, and easy to analyze and compare. The magnitude of the change of different physical quantities can be directly judged by comparing the size of the slope, or the difference in the rate of change of the same physical quantity in different time periods can be observed. Obtaining the mapping relationship between the slope of the fitted line and the optimization factor, and determining the optimization factor corresponding to each slope based on this, can provide a basis for the subsequent optimization of the current, voltage and temperature thresholds. This method can dynamically determine the optimization factor according to the data changes during the actual operation of the equipment, and then optimize the threshold. This enables the system to better adapt to different working conditions and environmental changes, improving the adaptability and reliability of the entire system. For example, when the vehicle is under different driving conditions, the current, voltage and temperature changes of the power supply equipment will be different. In this way, the threshold can be adjusted in time according to the actual changes to ensure that the smart fuse can take protective measures at the appropriate time.

[0055] S205: Optimizing the first current threshold based on the first optimization factor to obtain a second current threshold.

[0056] In this implementation, the second current threshold is calculated specifically according to the following formula: The second current threshold = the first current threshold × (1 + the first optimization factor); According to the above formula, the first current threshold can be optimized based on the first optimization factor to obtain the second current threshold.

[0057] S206: Optimize the first voltage threshold based on the second optimization factor to obtain a second voltage threshold.

[0058] In this implementation, the second voltage threshold is calculated specifically according to the following formula: The second voltage threshold = the first voltage threshold × (1 + the second optimization factor); According to the above formula, the first voltage threshold can be optimized based on the second optimization factor to obtain the second voltage threshold.

[0059] S207: Optimize the first temperature threshold based on the third optimization factor to obtain a second temperature threshold.

[0060] In this implementation, the second temperature threshold is calculated specifically according to the following formula: The second temperature threshold = the first temperature threshold × (1 + the third optimization factor); According to the above formula, the first temperature threshold can be optimized based on the third optimization factor to obtain the second temperature threshold.

[0061] S208: Control the smart fuse to cut off the power supply of the vehicle low-voltage auxiliary power device based on the second current threshold, the second voltage threshold, and the second temperature threshold.

[0062] In this embodiment, the smart fuse or the monitoring system related thereto will continuously monitor the current, voltage and temperature parameters of the vehicle low-voltage auxiliary power supply device in real time. For example, the current is monitored by a current sensor, the voltage is monitored by a voltage sensor, and the temperature sensor is monitored by a temperature sensor. The current, voltage and temperature values ​​monitored in real time are compared with the second current threshold, the second voltage threshold and the second temperature threshold respectively. If the monitored current value exceeds the second current threshold, this indicates that the current current is in an abnormal state and may cause damage to the device. At this time, the smart fuse will receive a signal about the current abnormality. When the monitored voltage value exceeds the second voltage threshold, it means that the voltage is abnormal. The smart fuse will receive a voltage abnormality signal, which may be caused by power failure or load abnormality, which may affect the normal operation of the device or even damage the device. If the temperature value is higher than the second temperature threshold, it means that the device temperature is too high, which may cause safety problems. The smart fuse will receive a temperature abnormality signal, which may be caused by poor heat dissipation of the device or excessive load.

[0063] The smart fuse will comprehensively consider the comparison results of these three parameters. In this embodiment, as long as one parameter exceeds the corresponding threshold, it may trigger the power cut-off operation. However, in some cases, certain logical rules may be set, such as requiring two or three parameters to exceed the threshold at the same time before the cut-off operation is performed, which depends on the specific system design and safety requirements.

[0064] When the smart fuse determines that the power supply needs to be cut off according to the set logic, it will use an internal control mechanism, such as driving an electromagnetic mechanism or a semiconductor switch, to cut off the circuit of the vehicle's low-voltage auxiliary power supply device, thereby preventing the current from continuing to flow to the device, thereby protecting the device and the vehicle's electrical system and avoiding failures or safety accidents caused by abnormal current, voltage or temperature.

[0065] It can be seen that the first current threshold, the first voltage threshold and the first temperature threshold are determined by collecting historical abnormal data within a preset historical time period. These historical data are real records of the actual abnormality of the device. The threshold determined on this basis can be more in line with the actual operation of the device. Compared with setting the threshold only based on theoretical values ​​or general standards, it can more accurately identify whether the device is in an abnormal state. The current, voltage and temperature change data within the preset historical time period are obtained, and the corresponding optimization factor is determined to optimize the initial threshold to obtain the second current threshold, the second voltage threshold and the second temperature threshold. These change data reflect the dynamic change characteristics of the device parameters over time. Considering these characteristics, the optimized threshold can more keenly capture the subtle changes in the operating state of the device, further improving the accuracy of abnormal judgment. When the current, voltage or temperature of the device exceeds the optimized second threshold, the intelligent fuse will quickly execute the power cut-off operation, which can effectively prevent the device from continuing to operate in an abnormal state and prevent further damage to the device due to overcurrent, overvoltage or overheating, such as avoiding serious faults such as circuit short circuit and component burnout, thereby extending the service life of the device and improving the reliability of the entire vehicle low-voltage auxiliary power supply equipment system. The method in this embodiment can not only cut off the power supply in time when the equipment has obvious abnormalities, but also discover potential problems in the operation of the equipment in advance by analyzing the change data and optimizing the thresholds. For example, a slight change in current or voltage may indicate that there are hidden dangers inside the equipment. The optimized thresholds can capture these changes more keenly, provide a basis for preventive maintenance, avoid the sudden occurrence of failures, and reduce maintenance costs and vehicle downtime.

[0066] See also Figure 5 , Figure 5 This is a flowchart of restoring power supply of a vehicle low-voltage auxiliary power device provided by an embodiment of the present application, including but not limited to the following steps: S501: Obtain a first current, a first voltage, and a first temperature corresponding to the vehicle low-voltage auxiliary power supply device at a first moment.

[0067] In this embodiment, the first moment is any moment after the intelligent fuse is controlled to cut off the power supply of the vehicle low-voltage auxiliary power supply device based on the second current threshold, the second voltage threshold and the second temperature threshold. After the intelligent fuse cuts off the power supply of the vehicle low-voltage auxiliary power supply device according to the second current threshold, the second voltage threshold and the second temperature threshold, the current value, voltage value and temperature value corresponding to the vehicle low-voltage auxiliary power supply device at this time are obtained in real time through corresponding measuring devices (such as current sensors, voltage sensors, temperature sensors, etc.). Taking the first moment as an example, the first current, first voltage and first temperature corresponding to the vehicle low-voltage auxiliary power supply device at the first moment are obtained, so as to determine whether the vehicle low-voltage auxiliary power supply device meets the conditions for restoring power supply at the first moment.

[0068] It should be noted that the monitoring method for whether the conditions for restoring power supply are met at any moment after the intelligent fuse is controlled based on the second current threshold, the second voltage threshold and the second temperature threshold to cut off the power supply of the vehicle's low-voltage auxiliary power supply equipment is similar to the first moment, so that the operating status of the vehicle's low-voltage auxiliary power supply equipment can be monitored in real time, and it is determined when the monitored vehicle's low-voltage auxiliary power supply equipment can meet the conditions for restoring power supply.

[0069] S502: Determine a stability value corresponding to the vehicle low-voltage auxiliary power supply device at the first moment based on the first current, the first voltage, and the first temperature.

[0070] In this embodiment, the greater the stability value, the better the stability of the vehicle low-voltage auxiliary power supply device. Figure 6 , Figure 6 A flow chart for determining a stability value provided by an embodiment of the present application includes but is not limited to the following steps: S601: Determine a current difference between the first current and a preset current.

[0071] In this embodiment, the first current is the current value of the vehicle's low-voltage auxiliary power supply device measured at a specific first moment, and the preset current is a reference current value set according to the normal working requirements or standards of the vehicle's low-voltage auxiliary power supply device. By calculating the difference between the first current and the preset current, the degree of deviation between the current current and the normal reference value can be understood.

[0072] S602: Determine a current deviation rate based on the current difference and the preset current.

[0073] In this embodiment, the current deviation rate is used to more accurately measure the relative degree of current deviation from the preset value. The current deviation rate can be determined by dividing the current difference by the preset current. This value can help us intuitively understand the deviation of the first current relative to the preset current, so as to subsequently comprehensively evaluate the operating status of the vehicle's low-voltage auxiliary power supply equipment.

[0074] S603: Determine a voltage difference between the first voltage and a preset voltage.

[0075] In this embodiment, the first voltage is the voltage value of the vehicle's low-voltage auxiliary power supply equipment measured at a specific first moment, and the preset voltage is a reference voltage value set according to the normal working requirements or standards of the vehicle's low-voltage auxiliary power supply equipment. By calculating the difference between the first voltage and the preset voltage, the degree of deviation between the current voltage and the normal reference value can be understood.

[0076] S604: Determine a voltage deviation rate based on the voltage difference and the preset voltage.

[0077] In this embodiment, the voltage deviation rate is used to more accurately measure the relative degree of voltage deviation from a preset value. The voltage deviation rate can be determined by dividing the voltage difference by the preset voltage. This value can help us intuitively understand the deviation of the first voltage relative to the preset voltage, so as to facilitate the subsequent comprehensive evaluation of the operating status of the vehicle's low-voltage auxiliary power supply equipment.

[0078] S605: Determine a temperature difference between the first temperature and a preset temperature.

[0079] In this embodiment, the first temperature is the temperature value of the vehicle's low-voltage auxiliary power supply equipment measured at a specific first moment, and the preset temperature is a reference temperature value set according to the normal working requirements or standards of the vehicle's low-voltage auxiliary power supply equipment. By calculating the difference between the first temperature and the preset temperature, the degree of deviation between the current temperature and the normal reference value can be understood.

[0080] S606: Determine a temperature deviation rate based on the temperature difference and the preset temperature.

[0081] In this embodiment, the temperature deviation rate is used to more accurately measure the relative degree of temperature deviation from the preset value. The temperature deviation rate can be determined by dividing the temperature difference by the preset temperature. This value can help us intuitively understand the deviation of the first temperature relative to the preset temperature, so as to facilitate the subsequent comprehensive evaluation of the operating status of the vehicle's low-voltage auxiliary power supply equipment.

[0082] S607: Determine a target deviation rate based on the current deviation rate, the voltage deviation rate, and the temperature deviation rate.

[0083] In this embodiment, exemplarily, the first weight corresponding to the current deviation rate, the second weight corresponding to the voltage deviation rate, and the third weight corresponding to the temperature deviation rate are determined, wherein the sum of the first weight, the second weight, and the third weight is 1. Specifically, in order to comprehensively evaluate the stability of the vehicle low-voltage auxiliary power supply equipment, it is necessary to consider the importance of the three factors of current deviation rate, voltage deviation rate, and temperature deviation rate. Here, a weight is assigned to each deviation rate to reflect its importance. The first weight corresponds to the current deviation rate, the second weight corresponds to the voltage deviation rate, and the third weight corresponds to the temperature deviation rate. The sum of these three weights is 1 to ensure that the sum of their proportions in the comprehensive calculation is complete. For example, if it is believed that the current deviation has the greatest impact on the stability of the equipment, a larger weight, such as 0.5, may be assigned to the current deviation rate, while the weights of the voltage deviation rate and the temperature deviation rate may be 0.3 and 0.2, respectively. The specific weight allocation needs to be determined according to the characteristics of the equipment and the actual operation conditions.

[0084] Exemplarily, a second time when the smart fuse performs an operation of cutting off the power supply of the vehicle low-voltage auxiliary power device based on the second current threshold, the second voltage threshold, and the second temperature threshold is determined.

[0085] Exemplarily, the time difference between the second moment and the first moment is determined. Specifically, the first moment is any moment after the smart fuse cuts off the power supply. By calculating the time difference between the second moment (the moment when the power supply is cut off) and the first moment, it can be understood how long it takes from cutting off the power supply to the first moment of interest. This time difference may be an important factor in analyzing the recovery or stability of the equipment. For example, if the time difference is short, it may indicate that the equipment is still in an unstable transition stage. If the time difference is long, the equipment may have enough time to adjust and recover, and its stability may be different.

[0086] Exemplarily, determining the adjustment factor corresponding to the time difference may specifically be a mapping relationship between a preset time difference and the adjustment factor, and the adjustment factor corresponding to the time difference may be determined based on the mapping relationship.

[0087] Exemplarily, the reference deviation rate is adjusted based on the adjustment factor to obtain the target deviation rate, and the target deviation rate is calculated specifically according to the following formula: Target deviation rate = reference deviation rate × (1 + adjustment factor); According to the above formula, the reference deviation rate can be adjusted based on the adjustment factor to obtain the target deviation rate.

[0088] It can be seen that by determining the current deviation rate, voltage deviation rate and temperature deviation rate, and assigning corresponding weights to them respectively to calculate the reference deviation rate, the influence of changes in multiple key parameters on the stability of the vehicle low-voltage auxiliary power supply equipment during operation can be comprehensively considered. Different parameters have different importance for the stable operation of the equipment. The setting of weights can be flexibly adjusted according to actual conditions, so that the calculation results are more in line with the actual operating characteristics of the equipment. Determine the second moment when the intelligent fuse cuts off the power supply and the time difference with the first moment, and determine the adjustment factor based on the time difference. This fully considers the influence of time on the equipment status. The recovery and stability of the equipment are often different at different time points after the power is cut off. The adjustment factor corresponding to the time difference can reflect the changing trend of the equipment stability over time, so as to more accurately evaluate the actual stability of the equipment at a specific moment. The target deviation rate is obtained by adjusting the reference deviation rate based on the adjustment factor. This method combines the comprehensive evaluation of multiple parameters with the dynamic adjustment of the time factor, which can more accurately reflect the actual stability of the vehicle's low-voltage auxiliary power supply equipment at the first moment. Compared with the evaluation method that only considers a single parameter or does not consider the time factor, it greatly improves the accuracy and reliability of the evaluation, provides a more scientific basis for the subsequent judgment of the equipment status and the adoption of corresponding control measures, and helps to more effectively ensure the stable operation and safety of the vehicle's low-voltage auxiliary power supply equipment.

[0089] S608: Determine a stability value corresponding to the vehicle low-voltage auxiliary power supply device at the first moment based on the target deviation rate.

[0090] In this embodiment, the smaller the target deviation rate, the larger the stability value. The stability value of the device at the first moment is determined according to the target deviation rate. Usually, there is an inverse proportional relationship between the two, that is, the smaller the target deviation rate, the closer the device is to the normal working state in terms of current, voltage and temperature, the better the stability of the device, and the larger the corresponding stability value. The specific conversion relationship may be determined by factors such as the characteristics of the device, historical data and actual application requirements, and the stability value may be calculated by a specific function or empirical formula. For example, when the target deviation rate is 5%, the corresponding stability value may be 80 (assuming that the stability value range is 0-100), and when the target deviation rate is reduced to 3%, the stability value may increase to 90, so that the stability of the device at the first moment can be quantitatively evaluated by the target deviation rate.

[0091] It can be seen that the stability of the vehicle's low-voltage auxiliary power supply equipment is affected by multiple factors such as current, voltage, and temperature. Calculating the deviation rate of these three parameters separately can fully reflect the operation of the equipment in different aspects and avoid the one-sidedness caused by judging only by a single parameter. The current, voltage, and temperature deviation rates are comprehensively calculated to obtain the target deviation rate, and the stability value is determined accordingly, realizing a quantitative assessment of the stability of the equipment. This quantitative method makes the judgment of the equipment status more objective and accurate, and facilitates operators or control systems to make accurate decisions based on specific values. The preset current, voltage, and temperature values ​​are usually the reference standards for the normal operation of the equipment. By calculating the deviation rate, the degree of deviation of the equipment operating parameters from the standard values ​​can be discovered in a timely manner, which helps to detect potential faults or abnormalities at an early stage. Even if the equipment has not yet experienced obvious faults, a small change in the deviation rate may also indicate performance changes or potential problems of certain components, providing a basis for preventive maintenance and avoiding serious consequences caused by equipment failure. Different vehicle operating conditions may have different requirements for low-voltage auxiliary power equipment. Through this deviation rate-based evaluation method, the evaluation of equipment stability under various operating conditions can be flexibly adapted according to the actual preset values. For example, in different operating stages such as vehicle startup, acceleration, and deceleration, the preset values ​​can be adjusted according to actual needs, thereby accurately evaluating the stability of the equipment under different operating conditions and ensuring that the equipment can operate stably under various conditions.

[0092] S503: When the stability value is greater than a preset stability value, controlling the intelligent fuse to execute an operation of restoring power supply to the vehicle low-voltage auxiliary power supply device.

[0093] In this embodiment, the preset stability value is a standard for measuring whether the device is stable enough to resume power supply. When the stability value calculated based on the first current, the first voltage and the first temperature is greater than the preset stability value, it indicates that the stability of the vehicle's low-voltage auxiliary power supply device has reached the condition for resuming power supply. At this time, the control system will issue an instruction to let the smart fuse perform the operation of restoring power supply, so that the vehicle's low-voltage auxiliary power supply device will resume providing power to the vehicle's related systems or equipment to ensure the normal operation of the vehicle. For example, if the preset stability value is 80, and the calculated stability value is 85, which is greater than the preset value, then the smart fuse will act to resume power supply to the device.

[0094] It can be seen that the power supply is restored only when the stability value is greater than the preset stability value, ensuring that the equipment has the conditions for stable operation before restarting, avoiding premature or unnecessary power restoration, reducing the impact of frequent start and stop of equipment on the electrical system, and improving the stability and efficiency of the system. At the same time, this intelligent control method also reduces the need for manual intervention and improves the automation level of the vehicle's electrical system. The vehicle's low-voltage auxiliary power supply equipment provides power support for many important systems of the vehicle, such as lighting, signals, and electronic control units. Ensuring the stable operation of these devices is crucial for the safe driving of the vehicle. Through the above control strategy, equipment failures can be discovered and handled in a timely manner, reducing safety risks caused by electrical system failures, such as lights going out, electronic equipment failures, etc., ensuring driving safety, and reducing equipment failures and system downtime, which can improve the overall reliability and availability of the vehicle.

[0095] In summary, the implementation of the embodiments of this application has the following beneficial effects: It can be seen that the vehicle low-voltage auxiliary power supply equipment protection method described in the embodiment of the present application is applied to a vehicle low-voltage auxiliary power supply equipment protection system, wherein the vehicle low-voltage auxiliary power supply equipment protection system includes an intelligent fuse and a vehicle low-voltage auxiliary power supply equipment. First, historical abnormal data of the vehicle low-voltage auxiliary power supply equipment within a preset historical time period is obtained, and then the first current threshold, the first voltage threshold and the first temperature threshold of the vehicle low-voltage auxiliary power supply equipment are determined based on the historical abnormal data. Then, the current change data, the voltage change data and the temperature change data of the vehicle low-voltage auxiliary power supply equipment within the preset historical time period are obtained, and then the first optimization factor corresponding to the current change data, the second optimization factor corresponding to the voltage change data, and the third optimization factor corresponding to the temperature change data are determined. Then, the first current threshold is optimized based on the first optimization factor to obtain the second current threshold, and the first voltage threshold is optimized based on the second optimization factor to obtain the second voltage threshold, and the first temperature threshold is optimized based on the third optimization factor to obtain the second temperature threshold. Finally, the intelligent fuse is controlled based on the second current threshold, the second voltage threshold and the second temperature threshold to perform the operation of cutting off the power supply of the vehicle low-voltage auxiliary power supply equipment, thereby improving the safety of the vehicle low-voltage auxiliary power supply equipment.

[0096] See also Figure 7 , Figure 7 1 is a schematic diagram of the structure of a vehicle low-voltage auxiliary power supply equipment protection device provided in an embodiment of the present application. The vehicle low-voltage auxiliary power supply equipment protection device 700 is applied to a vehicle low-voltage auxiliary power supply equipment protection system. The vehicle low-voltage auxiliary power supply equipment protection system includes an intelligent fuse and a vehicle low-voltage auxiliary power supply equipment. The vehicle low-voltage auxiliary power supply equipment protection device 700 includes: an acquisition unit 701 and a processing unit 702; The acquisition unit 701 is used to acquire historical abnormal data of the vehicle low-voltage auxiliary power supply device within a preset historical time period; The processing unit 702 is used to determine a first current threshold, a first voltage threshold and a first temperature threshold of the vehicle low-voltage auxiliary power supply device based on the historical abnormal data; Acquire current change data, voltage change data and temperature change data of the vehicle low-voltage auxiliary power supply device within the preset historical time period; Determine a first optimization factor corresponding to the current change data, a second optimization factor corresponding to the voltage change data, and a third optimization factor corresponding to the temperature change data; Optimizing the first current threshold based on the first optimization factor to obtain a second current threshold; Optimizing the first voltage threshold based on the second optimization factor to obtain a second voltage threshold; Optimizing the first temperature threshold based on the third optimization factor to obtain a second temperature threshold; The smart fuse is controlled to perform an operation of cutting off power to the vehicle low-voltage auxiliary power device based on the second current threshold, the second voltage threshold, and the second temperature threshold.

[0097] In some possible implementations, in determining the first current threshold, the first voltage threshold, and the first temperature threshold of the vehicle low-voltage auxiliary power device based on the historical abnormal data, the processing unit 702 is specifically configured to: Determine n abnormal moments based on the historical abnormal data, and n current values, n voltage values, and n temperature values ​​corresponding to the n abnormal moments; n is an integer greater than 1; Determine the average value of the n current values ​​to obtain a current average value; Obtaining the line resistance of the vehicle low-voltage auxiliary power device; Determining a first fine-tuning parameter corresponding to the line resistance; Adjust the current average value based on the first fine-tuning parameter to obtain the first current threshold; Determine an average value of the n voltage values ​​to obtain a voltage average value; Determining a load balance degree of the vehicle low-voltage auxiliary power supply device; determining a second fine-tuning parameter corresponding to the load balancing degree; Adjust the voltage average value based on the second fine-tuning parameter to obtain the first voltage threshold; Determine the average value of the n temperature values ​​to obtain a temperature average value; Obtaining the average ambient temperature corresponding to the n abnormal moments; determining a third fine-tuning parameter corresponding to the average ambient temperature; The temperature average value is adjusted based on the third fine-tuning parameter to obtain the first temperature threshold.

[0098] In some possible implementations, in determining the load balance degree of the vehicle low-voltage auxiliary power supply device, the processing unit 702 is specifically configured to: Determine m parallel load branches corresponding to the vehicle low-voltage auxiliary power supply device; m is an integer greater than 1; Obtaining a voltage drop corresponding to each of the m parallel load branches to obtain m voltage drops; Determining the standard deviations corresponding to the m voltage drops; A load balance degree corresponding to the standard deviation is determined; the larger the standard deviation is, the smaller the load balance degree of the vehicle low-voltage auxiliary power supply device is.

[0099] In some possible implementations, in determining the first optimization factor corresponding to the current change data, the second optimization factor corresponding to the voltage change data, and the third optimization factor corresponding to the temperature change data, the processing unit 702 is specifically configured to: Perform fitting according to the current change data to obtain a current change straight line; Perform fitting according to the voltage variation data to obtain a voltage variation straight line; Perform fitting according to the temperature change data to obtain a temperature change straight line; Determine a first slope corresponding to the current variation line, a second slope corresponding to the voltage variation line, and a third slope corresponding to the temperature variation line; Obtain the mapping relationship between the slope of the fitting line and the optimization factor; A first optimization factor corresponding to the first slope, a second optimization factor corresponding to the second slope, and a third optimization factor corresponding to the third slope are determined based on the mapping relationship.

[0100] In some possible implementations, the processing unit 702 is further specifically configured to: Obtaining a first current, a first voltage, and a first temperature corresponding to the vehicle low-voltage auxiliary power supply device at a first moment; the first moment is any moment after the intelligent fuse is controlled to perform an operation of cutting off the power supply of the vehicle low-voltage auxiliary power supply device based on the second current threshold, the second voltage threshold, and the second temperature threshold; determining a stability value corresponding to the vehicle low-voltage auxiliary power supply device at the first moment based on the first current, the first voltage, and the first temperature; the greater the stability value, the better the stability of the vehicle low-voltage auxiliary power supply device; When the stability value is greater than a preset stability value, the intelligent fuse is controlled to perform an operation of restoring power supply to the vehicle low-voltage auxiliary power device.

[0101] In some possible implementations, in determining the stability value corresponding to the vehicle low-voltage auxiliary power supply device at the first moment based on the first current, the first voltage, and the first temperature, the processing unit 702 is specifically configured to: determining a current difference between the first current and a preset current; Determining a current deviation rate based on the current difference and the preset current; determining a voltage difference between the first voltage and a preset voltage; Determining a voltage deviation rate based on the voltage difference and the preset voltage; determining a temperature difference between the first temperature and a preset temperature; determining a temperature deviation rate based on the temperature difference and the preset temperature; Determine a target deviation rate based on the current deviation rate, the voltage deviation rate, and the temperature deviation rate; The stability value corresponding to the vehicle low-voltage auxiliary power supply device at the first moment is determined based on the target deviation rate; the smaller the target deviation rate, the greater the stability value.

[0102] In some possible implementations, in determining the target deviation rate based on the current deviation rate, the voltage deviation rate, and the temperature deviation rate, the processing unit 702 is specifically configured to: Determine a first weight corresponding to the current deviation rate, a second weight corresponding to the voltage deviation rate, and a third weight corresponding to the temperature deviation rate; the sum of the first weight, the second weight, and the third weight is 1; Calculate based on the current deviation rate, the voltage deviation rate, the temperature deviation rate, the first weight, the second weight, and the third weight to obtain a reference deviation rate; determining a second time when the smart fuse performs an operation of cutting off the power supply of the vehicle low-voltage auxiliary power device based on the second current threshold, the second voltage threshold, and the second temperature threshold; determining a time difference between the second moment and the first moment; determining an adjustment factor corresponding to the time difference; The reference deviation rate is adjusted based on the adjustment factor to obtain the target deviation rate.

[0103] See also Figure 8 , Figure 8 Schematic diagram of the structure of an electronic device provided by the embodiment of the present application. Figure 8 As shown, the electronic device 800 includes a transceiver 801, a processor 802 and a memory 803. They are connected via a bus 804. The memory 803 is used to store computer programs and data, and the transceiver 801 can transmit the data stored in the memory 803 to the processor 802. The above program includes instructions for executing the following steps: Acquiring historical abnormal data of the vehicle low-voltage auxiliary power supply device within a preset historical time period; determining a first current threshold, a first voltage threshold, and a first temperature threshold of the vehicle low-voltage auxiliary power device based on the historical abnormal data; Acquire current change data, voltage change data and temperature change data of the vehicle low-voltage auxiliary power supply device within the preset historical time period; Determine a first optimization factor corresponding to the current change data, a second optimization factor corresponding to the voltage change data, and a third optimization factor corresponding to the temperature change data; Optimizing the first current threshold based on the first optimization factor to obtain a second current threshold; Optimizing the first voltage threshold based on the second optimization factor to obtain a second voltage threshold; Optimizing the first temperature threshold based on the third optimization factor to obtain a second temperature threshold; The smart fuse is controlled to perform an operation of cutting off power to the vehicle low-voltage auxiliary power device based on the second current threshold, the second voltage threshold, and the second temperature threshold.

[0104] In some possible implementations, in terms of determining the first current threshold, the first voltage threshold, and the first temperature threshold of the vehicle low-voltage auxiliary power device based on the historical abnormal data, the above program includes instructions for performing the following steps: Determine n abnormal moments based on the historical abnormal data, and n current values, n voltage values, and n temperature values ​​corresponding to the n abnormal moments; n is an integer greater than 1; Determine the average value of the n current values ​​to obtain a current average value; Obtaining the line resistance of the vehicle low-voltage auxiliary power device; Determining a first fine-tuning parameter corresponding to the line resistance; Adjust the current average value based on the first fine-tuning parameter to obtain the first current threshold; Determine an average value of the n voltage values ​​to obtain a voltage average value; Determining a load balance degree of the vehicle low-voltage auxiliary power supply device; determining a second fine-tuning parameter corresponding to the load balancing degree; Adjust the voltage average value based on the second fine-tuning parameter to obtain the first voltage threshold; Determine the average value of the n temperature values ​​to obtain a temperature average value; Obtaining the average ambient temperature corresponding to the n abnormal moments; determining a third fine-tuning parameter corresponding to the average ambient temperature; The temperature average value is adjusted based on the third fine-tuning parameter to obtain the first temperature threshold.

[0105] In some possible implementations, in determining the load balance of the vehicle low-voltage auxiliary power device, the program includes instructions for executing the following steps: Determine m parallel load branches corresponding to the vehicle low-voltage auxiliary power supply device; m is an integer greater than 1; Obtaining a voltage drop corresponding to each of the m parallel load branches to obtain m voltage drops; Determining the standard deviations corresponding to the m voltage drops; A load balance degree corresponding to the standard deviation is determined; the larger the standard deviation is, the smaller the load balance degree of the vehicle low-voltage auxiliary power supply device is.

[0106] In some possible implementations, in terms of determining the first optimization factor corresponding to the current change data, the second optimization factor corresponding to the voltage change data, and the third optimization factor corresponding to the temperature change data, the program includes instructions for performing the following steps: Perform fitting according to the current change data to obtain a current change straight line; Perform fitting according to the voltage variation data to obtain a voltage variation straight line; Perform fitting according to the temperature change data to obtain a temperature change straight line; Determine a first slope corresponding to the current variation line, a second slope corresponding to the voltage variation line, and a third slope corresponding to the temperature variation line; Obtain the mapping relationship between the slope of the fitting line and the optimization factor; A first optimization factor corresponding to the first slope, a second optimization factor corresponding to the second slope, and a third optimization factor corresponding to the third slope are determined based on the mapping relationship.

[0107] In some possible implementations, the above program includes instructions for performing the following steps: Obtaining a first current, a first voltage, and a first temperature corresponding to the vehicle low-voltage auxiliary power supply device at a first moment; the first moment is any moment after the intelligent fuse is controlled to perform an operation of cutting off the power supply of the vehicle low-voltage auxiliary power supply device based on the second current threshold, the second voltage threshold, and the second temperature threshold; determining a stability value corresponding to the vehicle low-voltage auxiliary power supply device at the first moment based on the first current, the first voltage, and the first temperature; the greater the stability value, the better the stability of the vehicle low-voltage auxiliary power supply device; When the stability value is greater than a preset stability value, the intelligent fuse is controlled to perform an operation of restoring power supply to the vehicle low-voltage auxiliary power device.

[0108] In some possible implementations, in terms of determining the stability value corresponding to the vehicle low-voltage auxiliary power supply device at the first moment based on the first current, the first voltage, and the first temperature, the program includes instructions for performing the following steps: determining a current difference between the first current and a preset current; Determining a current deviation rate based on the current difference and the preset current; determining a voltage difference between the first voltage and a preset voltage; Determining a voltage deviation rate based on the voltage difference and the preset voltage; determining a temperature difference between the first temperature and a preset temperature; determining a temperature deviation rate based on the temperature difference and the preset temperature; Determine a target deviation rate based on the current deviation rate, the voltage deviation rate, and the temperature deviation rate; The stability value corresponding to the vehicle low-voltage auxiliary power supply device at the first moment is determined based on the target deviation rate; the smaller the target deviation rate, the greater the stability value.

[0109] In some possible implementations, in terms of determining the target deviation rate based on the current deviation rate, the voltage deviation rate, and the temperature deviation rate, the program includes instructions for performing the following steps: Determine a first weight corresponding to the current deviation rate, a second weight corresponding to the voltage deviation rate, and a third weight corresponding to the temperature deviation rate; the sum of the first weight, the second weight, and the third weight is 1; Calculate based on the current deviation rate, the voltage deviation rate, the temperature deviation rate, the first weight, the second weight, and the third weight to obtain a reference deviation rate; determining a second time when the smart fuse performs an operation of cutting off the power supply of the vehicle low-voltage auxiliary power device based on the second current threshold, the second voltage threshold, and the second temperature threshold; determining a time difference between the second moment and the first moment; determining an adjustment factor corresponding to the time difference; The reference deviation rate is adjusted based on the adjustment factor to obtain the target deviation rate.

[0110] It should be understood that the electronic devices in this application may include vehicle low-voltage auxiliary power supply equipment protection devices, smart phones (such as Android phones, iOS phones, Windows Phone phones, etc.), tablet computers, PDAs, laptops, mobile Internet devices MID (Mobile Internet Devices, MID for short) or wearable devices or servers, edge computing nodes, etc. The above electronic devices are only examples, not exhaustive, and include but are not limited to the above electronic devices.

[0111] The embodiment of the present application also provides a computer-readable storage medium, which stores a computer program. The computer program is executed by a processor to implement part or all of the steps of any one of the vehicle low-voltage auxiliary power supply equipment protection methods described in the above method embodiments.

[0112] An embodiment of the present application also provides a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program can be operated to enable a computer to execute part or all of the steps of any vehicle low-voltage auxiliary power supply equipment protection method recorded in the above method implementation.

[0113] It should be noted that, for the above-mentioned various method implementations, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that this application is not limited by the order of the actions described, because according to this application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the implementations described in the specification are all optional implementations, and the actions and modules involved are not necessarily required by this application.

[0114] In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0115] In the several embodiments provided in this application, it should be understood that the disclosed device can be implemented in other ways. For example, the device implementation described above is only schematic, such as the division of units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0116] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0117] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of a software program module.

[0118] If the integrated unit is implemented in the form of a software program module and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a memory, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of each implementation method of the present application. The aforementioned memory includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk and other media that can store program codes.

[0119] A person skilled in the art may understand that all or part of the steps in the various methods of the above-mentioned embodiments may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable memory, and the memory may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0120] The above is a detailed introduction to the implementation methods of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above implementation methods is only used to help understand the method and core idea of ​​the present application. At the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for protecting low-voltage auxiliary power supply equipment of a vehicle, characterized in that: Applied to a vehicle low-voltage auxiliary power supply equipment protection system, the vehicle low-voltage auxiliary power supply equipment protection system includes an intelligent fuse and a vehicle low-voltage auxiliary power supply equipment, and the method includes: Acquiring historical abnormal data of the vehicle low-voltage auxiliary power supply device within a preset historical time period; determining a first current threshold, a first voltage threshold, and a first temperature threshold of the vehicle low-voltage auxiliary power device based on the historical abnormal data; Acquire current change data, voltage change data and temperature change data of the vehicle low-voltage auxiliary power supply device within the preset historical time period; Determine a first optimization factor corresponding to the current change data, a second optimization factor corresponding to the voltage change data, and a third optimization factor corresponding to the temperature change data; Optimizing the first current threshold based on the first optimization factor to obtain a second current threshold; Optimizing the first voltage threshold based on the second optimization factor to obtain a second voltage threshold; Optimizing the first temperature threshold based on the third optimization factor to obtain a second temperature threshold; The smart fuse is controlled to perform an operation of cutting off power to the vehicle low-voltage auxiliary power device based on the second current threshold, the second voltage threshold, and the second temperature threshold.

2. The method according to claim 1, characterized in that The determining, based on the historical abnormal data, a first current threshold, a first voltage threshold, and a first temperature threshold of the vehicle low-voltage auxiliary power supply device comprises: Determine n abnormal moments based on the historical abnormal data, and n current values, n voltage values, and n temperature values ​​corresponding to the n abnormal moments; n is an integer greater than 1; Determine the average value of the n current values ​​to obtain a current average value; Obtaining the line resistance of the vehicle low-voltage auxiliary power device; Determining a first fine-tuning parameter corresponding to the line resistance; Adjust the current average value based on the first fine-tuning parameter to obtain the first current threshold; Determine an average value of the n voltage values ​​to obtain a voltage average value; Determining a load balance degree of the vehicle low-voltage auxiliary power supply device; determining a second fine-tuning parameter corresponding to the load balancing degree; Adjust the voltage average value based on the second fine-tuning parameter to obtain the first voltage threshold; Determine the average value of the n temperature values ​​to obtain a temperature average value; Obtaining the average ambient temperature corresponding to the n abnormal moments; determining a third fine-tuning parameter corresponding to the average ambient temperature; The temperature average value is adjusted based on the third fine-tuning parameter to obtain the first temperature threshold.

3. The method according to claim 2, characterized in that Determining the load balance degree of the vehicle low-voltage auxiliary power supply device includes: Determine m parallel load branches corresponding to the vehicle low-voltage auxiliary power supply device; m is an integer greater than 1; Obtaining a voltage drop corresponding to each of the m parallel load branches to obtain m voltage drops; Determining the standard deviations corresponding to the m voltage drops; A load balance degree corresponding to the standard deviation is determined; the larger the standard deviation is, the smaller the load balance degree of the vehicle low-voltage auxiliary power supply device is.

4. The method according to claim 3, characterized in that The determining of the first optimization factor corresponding to the current change data, the second optimization factor corresponding to the voltage change data, and the third optimization factor corresponding to the temperature change data includes: Perform fitting according to the current change data to obtain a current change straight line; Perform fitting according to the voltage variation data to obtain a voltage variation straight line; Perform fitting according to the temperature change data to obtain a temperature change straight line; Determine a first slope corresponding to the current variation line, a second slope corresponding to the voltage variation line, and a third slope corresponding to the temperature variation line; Obtain the mapping relationship between the slope of the fitting line and the optimization factor; A first optimization factor corresponding to the first slope, a second optimization factor corresponding to the second slope, and a third optimization factor corresponding to the third slope are determined based on the mapping relationship.

5. The method according to any one of claims 2 to 4, characterized in that: The method further comprises: Acquire a first current, a first voltage, and a first temperature corresponding to the vehicle low-voltage auxiliary power supply device at a first moment; the first moment is any moment after the intelligent fuse is controlled to perform an operation of cutting off the power supply of the vehicle low-voltage auxiliary power supply device based on the second current threshold, the second voltage threshold, and the second temperature threshold; determining a stability value corresponding to the vehicle low-voltage auxiliary power supply device at the first moment based on the first current, the first voltage, and the first temperature; the greater the stability value, the better the stability of the vehicle low-voltage auxiliary power supply device; When the stability value is greater than a preset stability value, the intelligent fuse is controlled to perform an operation of restoring power supply to the vehicle low-voltage auxiliary power device.

6. The method according to claim 5, characterized in that The determining, based on the first current, the first voltage, and the first temperature, a stability value corresponding to the vehicle low-voltage auxiliary power supply device at the first moment includes: determining a current difference between the first current and a preset current; Determining a current deviation rate based on the current difference and the preset current; determining a voltage difference between the first voltage and a preset voltage; Determining a voltage deviation rate based on the voltage difference and the preset voltage; determining a temperature difference between the first temperature and a preset temperature; determining a temperature deviation rate based on the temperature difference and the preset temperature; Determine a target deviation rate based on the current deviation rate, the voltage deviation rate, and the temperature deviation rate; The stability value corresponding to the vehicle low-voltage auxiliary power supply device at the first moment is determined based on the target deviation rate; the smaller the target deviation rate, the greater the stability value.

7. The method according to claim 6, characterized in that The determining of the target deviation rate based on the current deviation rate, the voltage deviation rate, and the temperature deviation rate includes: Determine a first weight corresponding to the current deviation rate, a second weight corresponding to the voltage deviation rate, and a third weight corresponding to the temperature deviation rate; the sum of the first weight, the second weight, and the third weight is 1; Calculate based on the current deviation rate, the voltage deviation rate, the temperature deviation rate, the first weight, the second weight, and the third weight to obtain a reference deviation rate; determining a second time when the smart fuse performs an operation of cutting off the power supply of the vehicle low-voltage auxiliary power device based on the second current threshold, the second voltage threshold, and the second temperature threshold; determining a time difference between the second moment and the first moment; determining an adjustment factor corresponding to the time difference; The reference deviation rate is adjusted based on the adjustment factor to obtain the target deviation rate.

8. A vehicle low-voltage auxiliary power supply equipment protection device, characterized in that: Applicable to a vehicle low-voltage auxiliary power supply equipment protection system, the vehicle low-voltage auxiliary power supply equipment protection system includes an intelligent fuse and a vehicle low-voltage auxiliary power supply equipment, the device includes: an acquisition unit and a processing unit; The acquisition unit is used to acquire historical abnormal data of the vehicle low-voltage auxiliary power supply device within a preset historical time period; The processing unit is used to determine a first current threshold, a first voltage threshold and a first temperature threshold of the vehicle low-voltage auxiliary power supply device based on the historical abnormal data; Acquire current change data, voltage change data and temperature change data of the vehicle low-voltage auxiliary power supply device within the preset historical time period; Determine a first optimization factor corresponding to the current change data, a second optimization factor corresponding to the voltage change data, and a third optimization factor corresponding to the temperature change data; Optimizing the first current threshold based on the first optimization factor to obtain a second current threshold; Optimizing the first voltage threshold based on the second optimization factor to obtain a second voltage threshold; Optimizing the first temperature threshold based on the third optimization factor to obtain a second temperature threshold; The smart fuse is controlled to perform an operation of cutting off power to the vehicle low-voltage auxiliary power device based on the second current threshold, the second voltage threshold, and the second temperature threshold.

9. An electronic device, characterized in that: The method comprises a processor, a memory, a communication interface and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the processor, and the one or more programs include instructions for executing the steps in the method described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement the method according to any one of claims 1 to 7.

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