Vehicle low-voltage power supply topology scheme determination method

Abstract

The invention provides a vehicle low-voltage power supply topology scheme determination method, and relates to the technical field of power supply of vehicle auxiliary equipment. The method comprises a forward screening process, a transverse comparison process and a reverse feedback process. The forward screening process comprises the step of collecting function safety requirements of the whole vehicle function; identifying an associated functional security demand; determining a functional safety target of the low-voltage power supply system; a predetermined number of low-voltage power supply topology schemes are selected according to the functional safety goals. The transverse comparison process includes evaluating and scoring a predetermined number of low-voltage power supply topology schemes based on a plurality of evaluation items. The reverse feedback process comprises the steps of determining weights for a plurality of evaluation items according to vehicle type item positioning and vehicle type comprehensive requirements; weighting the score by using the weight, and calculating a scheme score; and selecting a final low-voltage power supply topology scheme according to the scheme score. According to the invention, development requirements can be met more comprehensively, and meanwhile, the cost of the whole vehicle and unnecessary safety redundancy are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply for vehicle auxiliary equipment, and more particularly to a method for determining a vehicle low-voltage power supply topology solution. Background Art

[0002] Currently, most vehicle platforms utilize traditional fuse and relay solutions for low-voltage electrical system designs to ensure the safety of the vehicle's low-voltage wiring harness and low-voltage electrical components. With the advancement of intelligent driving features and functional safety, traditional low-voltage power supply topologies are no longer able to meet the functional safety requirements of Level 2++, Level 3, and higher intelligent driving features. Therefore, it is necessary to introduce electronic switches to replace traditional fuses and relays, developing a low-voltage power supply topology that differs from traditional solutions.

[0003] However, there are many new topology solutions based on electronic switches, isolators, and redundant power supplies. Multiple topology solutions can be selected based on many factors. Therefore, it is currently necessary to develop a topology screening method to select the one that best suits the needs of a specific vehicle model. Summary of the Invention

[0004] In order to solve the above-mentioned problems in the prior art, an embodiment of the present invention provides a method for determining a vehicle low-voltage power supply topology scheme, the method comprising: a forward screening process: collecting functional safety requirements of the entire vehicle function; identifying functional safety requirements associated with the low-voltage power supply system in the functional safety requirements of the entire vehicle function; determining the functional safety goals of the low-voltage power supply system according to the functional safety level of the functional safety requirements associated with the low-voltage power supply system; selecting a predetermined number of low-voltage power supply topology schemes according to the functional safety goals; a horizontal comparison process: evaluating and scoring the predetermined number of low-voltage power supply topology schemes based on multiple evaluation items, the multiple evaluation items including component cost, part development cost, low-voltage power supply system weight, vehicle availability, robustness, safety, scalability and installation space; a reverse feedback process: determining weights for the multiple evaluation items based on the vehicle project positioning and the comprehensive requirements of the vehicle model; weighting the scores using the weights of the evaluation items to calculate the scheme scores of the predetermined number of low-voltage power supply topology schemes; and selecting a final low-voltage power supply topology scheme from the predetermined number of low-voltage power supply topology schemes according to the scheme scores.

[0005] In some embodiments, selecting a final low-voltage power supply topology scheme from the predetermined number of low-voltage power supply topology schemes according to the scheme score includes: when the difference between the scores of the first-ranked and second-ranked schemes is greater than a threshold, selecting the low-voltage power supply topology scheme with the first-ranked scheme score as the final low-voltage power supply topology scheme; when the difference between the scores of the first-ranked and second-ranked schemes is less than or equal to the threshold, selecting the scheme with a higher score in the evaluation item with the largest weight among the first-ranked and second-ranked schemes as the final low-voltage power supply topology scheme.

[0006] In some embodiments, identifying functional safety requirements associated with the low-voltage power supply system in the functional safety requirements of the entire vehicle function includes: dividing the functional safety requirements of the entire vehicle function into three levels: related, partially related, and unrelated to the low-voltage power supply system; and determining the functional safety requirements of the related level and the partially related level as functional safety requirements associated with the low-voltage power supply system.

[0007] In some embodiments, determining the functional safety target of the low-voltage power supply system based on the functional safety level of the functional safety requirements associated with the low-voltage power supply system includes: obtaining the functional safety level of the functional safety requirements of the relevant level as the first functional safety level; disassembling some of the functional safety requirements of the relevant level to obtain the functional safety level of the part related to the low-voltage power supply system as the second functional safety level; and taking the higher level of the first functional safety level and the second functional safety level as the functional safety target of the low-voltage power supply system.

[0008] In some embodiments, the types of vehicle functions include one or more of electrical functions, body functions, drive functions, intelligent driving functions, and chassis functions.

[0009] In some embodiments, the vehicle availability evaluation item includes an evaluation of redundant power supply and power isolation of the vehicle model.

[0010] In some embodiments, the score of the robustness evaluation item is determined based on the frequency with which the low-voltage power supply topology solution is used in mass-produced vehicle models.

[0011] In some embodiments, the score of the scalability evaluation item is obtained according to the following steps: counting the changes required when applying the low-voltage power supply topology solution to different platforms, the change range includes the changed number of interfaces, the changed number of components, the changed voltage value, and the changed current value.

[0012] In some embodiments, the weights of the component cost evaluation item and the part development cost evaluation item are determined based on the cost or pricing of the current vehicle model and the competing vehicle models; and / or the weight of the low-voltage power system weight evaluation item is determined based on a comparison of the weight of the current vehicle model and the competing vehicle models.

[0013] In some embodiments, the weights of vehicle availability evaluation items are determined based on the functional safety level and / or intelligent driving level of the vehicle model, and / or the weights of safety evaluation items are determined based on the functional safety goals of the vehicle low-voltage power system.

[0014] The method for determining the low-voltage power supply topology scheme proposed in the embodiment of the present invention includes three processes: forward screening, horizontal comparison and reverse feedback. It has significant advantages over screening schemes that only have forward screening or only have a combination of forward and horizontal screening. Purely positive evaluation and selection of low-voltage power supply system topology schemes will lead to unnecessary cost increases and the existence of design redundancy. Through multi-faceted horizontal evaluation and comparison, the advantages and disadvantages of each topology scheme can be fully understood, and unnecessary cost increases can be reduced to a certain extent from the perspective of component costs and development costs. The process of adding reverse feedback can comprehensively consider the selection of the early topology scheme in combination with the vehicle model positioning and needs of vehicle development, which is more in line with the current vehicle model development requirements for cost savings. In addition, by restricting vehicle availability and safety indicators, the safety of development and design can also be improved. In summary, through the three processes of forward screening, horizontal comparison and reverse feedback, it is possible to reduce the cost of the entire vehicle and unnecessary safety redundancy while more comprehensively meeting development needs.

[0015] The horizontal comparison of the implementation methods of the present invention includes eight aspects: component cost, part development cost, low-voltage power system weight, vehicle availability, robustness, safety, scalability and installation space. It comprehensively considers various factors affecting the topology design and can achieve the purpose of selecting the most practical topology solution.

[0016] The low-voltage power supply topology determination method proposed in this embodiment utilizes a weighted scoring approach during the reverse feedback process, emphasizing the importance of both key performance indicators and overall scoring. This approach not only integrates various design requirements but also addresses the most critical aspects of vehicle development, such as cost and safety. This approach is more suitable for current automotive applications, allowing for trade-offs in certain evaluation criteria where appropriate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the embodiments of the present invention will become readily understood by reading the following detailed description with reference to the accompanying drawings, in which several embodiments of the present invention are shown by way of example and not limitation, in which:

[0018] Figure 1 A schematic flow chart of a method for determining a vehicle low-voltage power supply topology solution according to an embodiment of the present invention is shown;

[0019] Figure 2A flow chart showing a forward screening process according to an embodiment of the present invention is shown;

[0020] Figure 3 A schematic diagram showing a horizontal comparison process according to an embodiment of the present invention is shown;

[0021] Figure 4 A flow chart of a reverse feedback process according to an embodiment of the present invention is shown.

[0022] In the drawings, the same or corresponding reference numerals denote the same or corresponding parts. DETAILED DESCRIPTION

[0023] The principles and spirit of the present invention will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are provided only to enable those skilled in the art to better understand and implement the present invention, and are not intended to limit the scope of the present invention in any way.

[0024] In one aspect, an embodiment of the present invention provides a method for determining a vehicle low-voltage power supply topology solution. Figure 1 , which shows a flow chart of a method for determining a vehicle low-voltage power supply topology solution according to an embodiment of the present invention. Figure 1 As shown, the method includes a forward screening process 100 , a horizontal comparison process 200 , and a reverse feedback process 300 .

[0025] refer to Figure 2 , which shows a flow chart of a forward screening process according to an embodiment of the present invention. The forward screening process 100 includes steps S101-S104.

[0026] In step S101, functional safety requirements of vehicle functions are collected. As an embodiment of the present invention, the types of vehicle functions include one or more of electrical functions, body functions, drive functions, intelligent driving functions, and chassis functions.

[0027] Before selecting a topology, we proactively collect the functional safety requirements of the entire vehicle. These requirements include functional safety target information. Once collected, they are summarized and analyzed. The collected information is primarily categorized into five functional areas: electrical functions, body functions, drive functions, intelligent driving functions, and chassis functions.

[0028] In step S102 , functional safety requirements associated with the low-voltage power supply system are identified from functional safety requirements of the entire vehicle functions.

[0029] As an embodiment of the present invention, step S102 may include: dividing the functional safety requirements of the entire vehicle function into three levels: related to the low-voltage power supply system, partially related, and unrelated; and determining the functional safety requirements of the related level and the partially related level as functional safety requirements associated with the low-voltage power supply system.

[0030] As an example, identify the functional safety requirements (FSR) related to the low-voltage power supply system from all the functional safety requirements of the five major functional items.

[0031] For example, a functional safety objective is to prevent the brake lights from unexpectedly turning off when the system is activated. This safety objective is related to the low-voltage power supply system, where power loss or voltage instability can cause the brake lights to unexpectedly turn off.

[0032] For example, if a safety objective of a function is to prevent the turn signal from accidentally turning on in the reverse direction when the system is activated, this safety objective is not related to the low-voltage power supply system because a fault in the low-voltage power supply system will not cause the turn signal to be accidentally turned on.

[0033] For example, the functional safety level (ASIL) can be divided into four levels from low to high: A, B, C, and D. The safety goal of a certain function is to avoid insufficient lateral torque provided by the vehicle when the system is activated. According to the requirements of the navigation assisted driving (Navigate on Autopilot, NOA) function of Zhijia, the requirement of this safety goal for high-speed NOA control is ASIL B, so the low-voltage power supply system takes on the requirements of ASIL B. The requirement of this safety goal for the steering system is ASIL D, and the NOA function requires the driver to take over after detecting a failure, and does not require the power system to supply power to maintain the system operation, so the requirement of this safety goal for the steering system has nothing to do with the low-voltage power supply. Therefore, this safety goal is partially related to the low-voltage power supply system.

[0034] In step S103 , a functional safety target of the low-voltage power supply system is determined according to a functional safety level of a functional safety requirement associated with the low-voltage power supply system.

[0035] As an embodiment of the present invention, step S103 may include: obtaining the functional safety level of functional safety requirements of relevant levels as the first functional safety level; disassembling some functional safety requirements of relevant levels to obtain the functional safety level of the part related to the low-voltage power supply system as the second functional safety level; and taking the higher level between the first functional safety level and the second functional safety level as the functional safety target of the low-voltage power supply system.

[0036] The relevant FSRs will be judged or differentiated into three levels: Irrelevant (irrelevant), Partially relevant (partially relevant) and Relevant (relevant). The Irrelevant-level FSRs will be excluded, and the Partially relevant and Relevant-level FSRs will be analyzed and disassembled to determine the final functional safety requirements of the highest ASIL level related to the low-voltage power supply topology solution as the functional safety target of the low-voltage power supply system.

[0037] In step S104 , a predetermined number of low-voltage power supply topology solutions are selected according to a functional safety target.

[0038] As an example only, based on the functional safety goals of the low-voltage power supply system, a predetermined number of low-voltage power supply topology solutions can be preliminarily selected, for example, no more than three low-voltage power supply topology solutions. For example, by analyzing the functional safety goals of the entire vehicle, the functional safety goals related to the low-voltage power supply system, i.e., those at the Relevant level, are up to ASIL C. For functions that are partially related to the low-voltage power supply system, i.e., those at the Partially Relevant level, by disassembling and analyzing the functional safety goals, the highest functional safety requirement for the low-voltage power supply system is ASIL B, and therefore the functional safety requirement for the low-voltage power supply system is ASIL C. Based on the safety level of ASIL C, and in accordance with, for example, the VDA450 standard and the special needs of the entire vehicle, no more than three power supply topology solutions are selected.

[0039] refer to Figure 3 , which shows a schematic diagram of the horizontal comparison process according to an embodiment of the present invention. Among them, three low-voltage power supply topology schemes are taken as examples, namely low-voltage power supply topology scheme 1, low-voltage power supply topology scheme 2, and low-voltage power supply topology scheme 3. The horizontal comparison process may include: evaluating and scoring a predetermined number of low-voltage power supply topology schemes based on multiple evaluation items. In this example, the three topology schemes are evaluated and scored respectively, and score 1, score 2, and score 3 are obtained. The multiple evaluation items include multiple of component cost, part development cost, low-voltage power supply system weight, vehicle availability, robustness, safety, scalability, and installation space. As an example, Figure 3 All eight evaluation items are shown in the table. In actual applications, you can select multiple of the eight evaluation items based on your needs.

[0040] The following examples illustrate how each assessment item is scored.

[0041] Component costs refer to the mass-produced prices of key components in low-voltage power systems (such as batteries, battery sensors, DC / DC converters, and isolators). The prices of each topology are normalized to form a score. Here and in the following sections, the scoring is normalized to bring each evaluation item into the same score range.

[0042] Parts development cost refers to the development engineering and prototype costs of the main components in the low-voltage power supply system. The prices of each topology are normalized and then calculated as a score.

[0043] Weight refers to the evaluation of the weight of low-voltage power supply components, including lead-acid batteries, DC / DC converters, and wiring harnesses. The weight of each topology solution is normalized and then calculated as a score.

[0044] Vehicle availability refers to the evaluation of whether the low-voltage power supply system meets the functional availability requirements of the system in the process of reaching a safe state. As an embodiment of the present invention, the vehicle availability evaluation items include the evaluation of the redundant power supply and power supply isolation of the vehicle model. If the low-voltage power supply system causes a common cause failure that violates the safety goals of the entire vehicle, the independence of the system power supply should be guaranteed when distributing the low-voltage power supply of the entire vehicle. For the development of vehicle models with high-level intelligent driving functions, if there is redundant power supply and power supply isolation, the score is high; if there is no redundant power supply or power supply isolation, the score is low; if there is no redundant power supply and power supply isolation, the score is low.

[0045] Robustness assesses the maturity and complexity of low-voltage power supply components and systems. As one embodiment of the present invention, the robustness score is determined based on the frequency with which a low-voltage power supply topology is used in mass-produced vehicle models. For example, if a topology is frequently used in mass-produced vehicle models or other host vehicle models, the robustness score will be high; otherwise, the score will be low.

[0046] Safety involves initially decomposing the vehicle-level low-voltage power system safety objectives into its components. A preliminary analysis is conducted to determine whether the current low-voltage power system components can meet the assigned safety objectives. Potential issues and risks in meeting the safety objectives set by the ADAS are analyzed, along with countermeasures. Fault injection simulation is performed on the low-voltage power system. A high score is awarded if there are no risks, a higher score if there are risks but mitigation measures are available, and a low score if there are risks but no clear mitigation measures are available or if the mitigation measures are difficult to implement.

[0047] Scalability refers to the evaluation of the scalability of the application of the low-voltage power supply system solution platform, which can be applied to different types of vehicles without major changes to the system. The stronger the scalability, the higher the score. As an embodiment of the present invention, the score of the scalability evaluation item is obtained according to the following steps: Counting the extent of changes that need to be made when the low-voltage power supply topology solution is applied to different platforms, the extent of changes includes the number of changed interfaces, the number of changed components, the changed voltage value, and the changed current value. In a specific implementation, the topology solution can be applied to different platforms, and the number of changes made can be counted, including the number of interfaces, the number of components, the voltage value, the current value, etc. The fewer the number of changes, the higher the score.

[0048] Installation space refers to the space required to install low-voltage power components, which may be more critical in compact vehicles. The space required for low-voltage power components and wiring harnesses is assessed, taking into account installation space and location constraints. The smaller the installation space, the higher the score.

[0049] Based on the above eight evaluation items, the three low-voltage power supply topologies are evaluated and scored. As an example, the scoring principle can be: each item is scored on a 100-point scale, with a maximum score of 100 for each evaluation item. Scoring is performed based on the specific parameters and evaluation principles of each item, without weighting. Only the score value of each of the eight evaluation items is displayed.

[0050] Figure 4 FIG. 3 is a flow chart showing a reverse feedback process according to an embodiment of the present invention. The reverse feedback process 300 may include steps S301 - S303 .

[0051] In step S301 , weights for multiple evaluation items are determined based on the vehicle model project positioning and comprehensive vehicle model requirements.

[0052] According to the vehicle model project positioning and vehicle model comprehensive requirements, the 8 evaluation items are weighted, and the weight values ​​are between 0 and 1, respectively. cc 、i dc 、i w 、i a 、i r 、i s 、i sc 、i i .

[0053] First, determine the vehicle model's baseline requirements for low-voltage power across the eight aforementioned evaluation criteria, such as cost, space, robustness, and safety. Weights are determined based on these baseline requirements.

[0054] As one embodiment of the present invention, the weights for component cost and part development cost assessments are determined based on the cost or pricing of the current vehicle model compared to competing models. If the vehicle's price is higher than that of competing models, the weight is higher; if the vehicle's price is lower than that of competing models, the weight is lower; if the vehicle's development model is positioned as low-cost, the weight is higher. For example, if the competing model costs 100,000 to 200,000 yuan, and the current model's cost requirement is 150,000 yuan, the weight is (15-10) / 10 = 0.5.

[0055] As one embodiment of the present invention, the weight of the low-voltage power system weight assessment item is determined based on a comparison of the weight of the vehicle model with that of competing vehicles. If the vehicle model's weight is higher than that of competing vehicles, the weight is increased; if the vehicle model's weight is lower than that of competing vehicles, the weight is decreased.

[0056] As one embodiment of the present invention, the weights of vehicle usability evaluation items are determined based on the vehicle model's functional safety level and / or intelligent driving level. If a vehicle model is positioned toward advanced autonomous driving or intelligent driving features, and has a high functional safety level and intelligent driving level, the weight is high; otherwise, the weight is low.

[0057] Regarding the weight of the robustness evaluation item, the higher the maturity of the power supply components and systems, the greater the weight value.

[0058] As for the weights of the safety assessment items, as one embodiment of the present invention, the weights of the safety assessment items are determined according to the functional safety goals of the vehicle low-voltage power supply system. The higher the functional safety goals of the vehicle power supply system, the greater the weight value.

[0059] Regarding the weight of the scalability evaluation item, if the vehicle model positioning will be expanded in the future to support different intelligent driving level requirements, for example, it needs to be changed from L2 to L3 level, and the low-voltage power supply system solution needs to be changed, the weight value will be large if there is a change requirement, and the weight value will be small if there is no change requirement.

[0060] Regarding the weight of the installation space assessment item, if the installation space is sufficient and the low-voltage power supply system can be flexibly arranged, the weight value is small; if the installation space is insufficient and it is necessary to assess whether the low-voltage power supply system can be reasonably arranged, the weight value is large.

[0061] The weights of the above-mentioned evaluation items may be normalized and then weighted.

[0062] In step S302, the scores are weighted using the weights of the evaluation items to calculate the solution scores of a predetermined number of low-voltage power supply topology solutions. The solution scores can be calculated by weighted summation.

[0063] For example, the scoring weight assignment calculation method is as follows:

[0064] S total =i cc S cc + i dc S dc + i w S w + i a S a + i r S r + i s S s + i sc S sc + i i S i ,

[0065] Among them, S total is the solution score of each low voltage power supply topology solution, i cc 、i dc 、i w 、i a 、i r 、i s 、i sc 、i i They are the weights of the 8 evaluation items, S cc 、S dc 、S w 、S a 、S r 、S s 、S sc 、S i There are scores for 8 evaluation items respectively.

[0066] In step S303 , a final low-voltage power supply topology solution is selected from a predetermined number of low-voltage power supply topology solutions according to the solution scores.

[0067] As an embodiment of the present invention, S303 may include: when the difference between the scores of the first-ranked and second-ranked solutions is greater than a threshold, selecting the low-voltage power supply topology solution with the first-ranked solution score as the final low-voltage power supply topology solution; when the difference between the scores of the first-ranked and second-ranked solutions is less than or equal to a threshold, selecting the solution with the higher score in the evaluation item with the largest weight among the first-ranked and second-ranked solutions as the final low-voltage power supply topology solution.

[0068] For example, if the difference between the top-ranked and second-ranked solutions is greater than a threshold value m, the top-ranked solution is selected. If the difference between the top-ranked and second-ranked solutions is less than the threshold value m, the evaluation item with the largest weight is selected, and the solution with the highest score for that item is the final solution. The screening scheme is as follows:

[0069] If S total,1 -S total,2 >m, so the solution with the highest score is selected;

[0070] If S total,1 -S total,2 <=m, so choose to obtain S max Smax refers to the highest score value of the evaluation item corresponding to the imax weight, where imax is the largest weight among the weights of multiple evaluation items. max =max(i cc ,i dc ,i w ,i a ,i r ,i s ,i sc ,i i ).

[0071] The method for determining the low-voltage power supply topology scheme proposed in the embodiment of the present invention is achieved through three processes: forward screening, horizontal comparison and reverse feedback. It has significant advantages over screening schemes that only have forward screening or a combination of forward and horizontal screening. Purely positive evaluation and selection of low-voltage power supply system topology schemes will lead to unnecessary cost increases and the existence of design redundancy. Through multi-faceted horizontal evaluation and comparison, the advantages and disadvantages of each topology scheme can be fully understood, and unnecessary cost increases can be reduced to a certain extent from the perspective of component costs and development costs. The process of adding reverse feedback can comprehensively consider the selection of the early topology scheme in combination with the vehicle model positioning and needs of vehicle development, which is more in line with the current vehicle model development requirements for cost savings. In addition, by restricting vehicle availability and safety indicators, the safety of development and design can also be improved. In summary, through the three processes of forward screening, horizontal comparison and reverse feedback, it is possible to reduce the cost of the entire vehicle and unnecessary safety redundancy while more comprehensively meeting development needs.

[0072] The horizontal comparison of the implementation methods of the present invention includes eight aspects: component cost, part development cost, low-voltage power system weight, vehicle availability, robustness, safety, scalability and installation space. It comprehensively considers various factors affecting the topology design and can achieve the purpose of selecting the most practical topology solution.

[0073] The embodiment of the present invention proposes a method for determining a low-voltage power supply topology solution. The reverse feedback process adopts a weighted scoring method, emphasizing the importance of the most critical indicators and the comprehensive score. It can not only integrate the design requirements of various aspects, but also take into account the most important requirements in the vehicle development process, such as cost considerations or safety requirements. When the comprehensive scores are similar, it is necessary to combine the scores of the evaluation items with the highest weight values ​​to determine the final topology solution. This solution is more suitable for the actual application solutions of current car companies, and makes trade-offs for certain evaluation items where appropriate.

[0074] For illustrative purposes, the foregoing description of the embodiments of the present invention has been given, which is not exhaustive nor intended to limit the present invention to disclosed exact forms. It will be appreciated by those skilled in the art that various changes may be made without departing from the scope of the present invention, and that elements therein may be replaced with equivalents. In addition, without departing from the basic scope of the present invention, many modifications may be made so that specific situations or materials are adapted to the teachings of the present invention. Therefore, the present invention is not intended to be limited to the specific embodiments disclosed as the best mode for realizing the present invention, and the present invention will include all embodiments within the scope of the appended claims.

Claims

1. A method for determining a vehicle low-voltage power supply topology solution, characterized in that: The method comprises: Forward screening process: collecting functional safety requirements of the entire vehicle functions; identifying functional safety requirements associated with the low-voltage power system within the functional safety requirements of the entire vehicle functions; determining functional safety goals of the low-voltage power system based on the functional safety levels of the functional safety requirements associated with the low-voltage power system; and selecting a predetermined number of low-voltage power topology solutions based on the functional safety goals. A horizontal comparison process: evaluating and scoring the predetermined number of low-voltage power supply topology solutions based on multiple evaluation items, wherein the multiple evaluation items include multiple of component cost, part development cost, low-voltage power supply system weight, vehicle availability, robustness, safety, scalability, and installation space; Reverse feedback process: Determine the weights of the multiple evaluation items based on the vehicle project positioning and the comprehensive requirements of the vehicle model; use the weights of the evaluation items to weight the scores and calculate the solution scores of a predetermined number of low-voltage power supply topology solutions; select a final low-voltage power supply topology solution from the predetermined number of low-voltage power supply topology solutions based on the solution scores.

2. The method for determining a vehicle low-voltage power supply topology solution according to claim 1, characterized in that: Selecting a final low-voltage power supply topology solution from the predetermined number of low-voltage power supply topology solutions according to the solution score includes: When the difference between the scores of the first-ranked and the second-ranked solutions is greater than a threshold, the low-voltage power supply topology solution with the highest solution score is selected as the final low-voltage power supply topology solution; When the difference between the scores of the first-ranked and second-ranked solutions is less than or equal to the threshold, the solution with the higher score in the evaluation item with the largest weight is selected from the first-ranked and second-ranked solutions as the final low-voltage power supply topology solution.

3. The method for determining a vehicle low-voltage power supply topology solution according to claim 1, characterized in that: The functional safety requirements associated with the low-voltage power supply system in the functional safety requirements of the entire vehicle function include: The functional safety requirements of the entire vehicle are divided into three levels: related to the low-voltage power system, partially related, and unrelated; The functional safety requirements of the relevant level and part of the relevant level are determined as the functional safety requirements associated with the low-voltage power supply system.

4. The method for determining a vehicle low-voltage power supply topology solution according to claim 3, characterized in that: Determining the functional safety objectives of the low-voltage power supply system based on the functional safety level of the functional safety requirements associated with the low-voltage power supply system includes: Obtain the functional safety level of the relevant level of functional safety requirements as the first functional safety level; Decompose the functional safety requirements of some related levels to obtain the functional safety level of the parts related to the low-voltage power supply system as the second functional safety level; A higher level between the first functional safety level and the second functional safety level is taken as the functional safety target of the low-voltage power supply system.

5. The method for determining a vehicle low-voltage power supply topology solution according to claim 1, characterized in that: The types of vehicle functions include one or more of electrical functions, body functions, drive functions, intelligent driving functions, and chassis functions.

6. The method for determining a vehicle low-voltage power supply topology solution according to any one of claims 1 to 5, characterized in that: Vehicle availability assessment items include evaluation of redundant power supply and power supply isolation of vehicle models.

7. The method for determining a vehicle low-voltage power supply topology solution according to any one of claims 1 to 5, characterized in that: The robustness evaluation items are scored based on the frequency with which the low-voltage power supply topology is used in mass-produced vehicle models.

8. The method for determining a vehicle low-voltage power supply topology solution according to any one of claims 1 to 5, characterized in that: Scoring of the scalability evaluation items is obtained according to the following steps: Statistics show the extent of changes required when applying low-voltage power supply topology solutions to different platforms. The extent of changes includes the number of changed interfaces, the number of changed components, the changed voltage value, and the changed current value.

9. The method for determining a vehicle low-voltage power supply topology solution according to any one of claims 1 to 5, characterized in that: The weighting of the component cost assessment and the part development cost assessment is determined based on the cost or pricing of the vehicle model and competing models; and / or The weight of the low-voltage power system weight assessment item is determined based on the comparison of the weight of this model with that of competing models.

10. The method for determining a vehicle low-voltage power supply topology solution according to any one of claims 1 to 5, characterized in that: The weights of vehicle availability assessment items are determined based on the functional safety level and / or intelligent driving level of the vehicle model, and / or the weights of safety assessment items are determined based on the functional safety goals of the vehicle's low-voltage power supply system.

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