Differential safety boundary determination method and apparatus, electronic device, and storage medium
By acquiring differential safety boundary setting data and fitting the initial torque-speed difference boundary curve, the problem of imprecise differential boundary setting in the existing technology is solved, and the stable operation and protection effect of the differential are optimized under different vehicle models and operating conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BEIJING AUTOMOBILE RES GENERAL INST
- Filing Date
- 2026-03-31
- Publication Date
- 2026-07-31
AI Technical Summary
The lack of refined and adaptive differential boundary setting methods in existing technologies leads to the risk of insufficient power or differential damage during vehicle use, and fails to provide adequate protection under extreme conditions.
By acquiring differential safety boundary data under multiple operating conditions, fitting the initial torque-speed difference boundary curve, and determining the differential safety boundary under preset conditions in bench testing and subjective evaluation, the differential safety boundary is dynamically formulated to achieve the optimal balance between vehicle performance and protection effect.
It has achieved stable operation of the differential under different vehicle models and operating conditions, avoiding abnormal risks and ensuring the optimization of vehicle performance and protection effect.
Smart Images
Figure CN122492850A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of vehicle technology, and in particular to a method, apparatus, electronic device and storage medium for determining the safety boundary of a differential. Background Technology
[0002] Currently, the setting of differential limits has a significant impact on vehicle lifespan and passenger driving experience. If the differential limits are set too strictly, the vehicle may experience insufficient power, slow start on inclines, or even inability to climb hills, severely limiting the full potential of the vehicle's performance. If the differential limits are set too loosely, the protective effect of the differential will be greatly reduced, and there is still a risk of damage to the differential after long-term use, and it will not provide sufficient protection under extreme operating conditions.
[0003] In related technologies, there are two main ways to determine the differential boundary: one is to repeatedly explore and determine the differential boundary through bench tests; the other is to rely on experience to set the stress-velocity (PV) value, and then calculate the fixed differential boundary based on the PV value.
[0004] However, the relevant technologies lack a refined and adaptive method for defining differential boundaries, which urgently needs to be addressed. Summary of the Invention
[0005] This application provides a method, apparatus, electronic device, and storage medium for determining the safety boundary of a differential, in order to solve the problem of the lack of a refined and adaptive method for determining the differential boundary in related technologies. By dynamically determining the safety boundary of the differential, the optimal balance between vehicle performance and protection effect can be achieved.
[0006] The first aspect of this application provides a method for determining the safety boundary of a differential, including the following steps: Acquire differential safety boundary data for vehicles under multiple operating conditions; Based on the differential safety boundary, the initial torque-speed difference boundary curve is obtained by data fitting. Based on the initial torque-speed difference boundary curve, the differential assembly is bench tested to obtain the bench test results. If the bench test results meet the first preset test conditions, obtain the subjective evaluation results of the differential assembly. If the subjective evaluation results meet the second preset test conditions, determine the differential safety boundary data based on the initial torque-speed difference boundary curve.
[0007] Optionally, in some embodiments, an initial torque-speed difference boundary curve is obtained by data fitting based on the differential safety boundary, including: The data defining the differential safety boundary is filtered to obtain filtered data. The filtered data is aligned and preprocessed to obtain preprocessed data; Based on the preprocessed data, a scatter plot of the data is drawn with torque and speed difference as key variables. Then, based on a preset polynomial fitting strategy, the scatter plot of the data is fitted to obtain the initial torque-speed difference boundary curve.
[0008] Optionally, in some embodiments, after obtaining the bench test results by performing bench testing on the differential assembly based on the initial torque-speed difference boundary curve, the method further includes: If the bench test results do not meet the first preset test conditions, reduce the corresponding motor torque threshold of the initial torque-speed difference boundary curve; Based on the adjusted motor torque threshold, bench testing was repeated until the new bench test results met the first preset test conditions.
[0009] Optionally, in some embodiments, after obtaining the subjective evaluation result of the differential assembly, the method further includes: If the subjective evaluation result of the differential assembly does not meet the second preset test conditions, the differential assembly is replaced, and based on the new differential assembly, the steps of obtaining differential safety boundary data for the vehicle under multiple operating conditions are repeated.
[0010] Optionally, in some embodiments, the differential safety boundary setting data includes motor torque, left wheel speed of the vehicle, right wheel speed of the vehicle, and time series.
[0011] A second aspect of this application provides a differential safety boundary determination device, comprising: The acquisition module is used to acquire differential safety boundary specification data for the vehicle under multiple operating conditions; The testing module is used to obtain the initial torque-speed difference boundary curve by fitting data according to the differential safety boundary, and to perform bench testing on the differential assembly based on the initial torque-speed difference boundary curve to obtain the bench test results. The generation module is used to obtain the subjective evaluation result of the differential assembly when the bench test result meets the first preset test conditions, and to determine the differential safety boundary data based on the initial torque-speed difference boundary curve when the subjective evaluation result meets the second preset test conditions.
[0012] Optionally, in some embodiments, the test module is specifically used for: The data defining the differential safety boundary is filtered to obtain filtered data. The filtered data is aligned and preprocessed to obtain preprocessed data; Based on the preprocessed data, a scatter plot of the data is drawn with torque and speed difference as key variables. Then, based on a preset polynomial fitting strategy, the scatter plot of the data is fitted to obtain the initial torque-speed difference boundary curve.
[0013] Optionally, in some embodiments, after obtaining bench test results by performing bench tests on the differential assembly based on the initial torque-speed difference boundary curve, the test module is further configured to: If the bench test results do not meet the first preset test conditions, reduce the corresponding motor torque threshold of the initial torque-speed difference boundary curve; Based on the adjusted motor torque threshold, bench testing was repeated until the new bench test results met the first preset test conditions.
[0014] Optionally, in some embodiments, after obtaining the subjective evaluation result of the differential assembly, the generation module is further configured to: If the subjective evaluation result of the differential assembly does not meet the second preset test conditions, the differential assembly is replaced, and based on the new differential assembly, the steps of obtaining differential safety boundary data for the vehicle under multiple operating conditions are repeated.
[0015] Optionally, in some embodiments, the differential safety boundary setting data includes motor torque, left wheel speed of the vehicle, right wheel speed of the vehicle, and time series.
[0016] A third aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the program to implement the differential safety boundary determination method described in the first aspect embodiment.
[0017] A fourth aspect of this application provides a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement the differential safety boundary determination method described in the first aspect embodiment.
[0018] Therefore, this application can obtain an initial torque-speed difference boundary curve by fitting differential safety boundary setting data, thereby conducting bench tests on the differential assembly to obtain bench test results. If the bench test results meet the first preset test conditions, a subjective evaluation result of the differential assembly is obtained. If the subjective evaluation result meets the second preset test conditions, the differential safety boundary data is determined. This solves the problem of the lack of a refined and adaptive differential boundary setting method in related technologies, achieving an optimal balance between vehicle performance and protection effect by dynamically setting the differential safety boundary.
[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0020] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart of a method for determining the safety boundary of a differential according to an embodiment of this application; Figure 2 This is a schematic diagram comparing measured data with a double-boundary curve according to an embodiment of this application; Figure 3 This is a flowchart of a method for determining the safety boundary of a differential according to an embodiment of this application; Figure 4 This is a flowchart illustrating a method for implementing a differential protection system according to an embodiment of this application; Figure 5 This is a block diagram of a differential safety boundary determination device according to an embodiment of this application; Figure 6 This is a schematic diagram of the structure of an electronic device according to an embodiment of this application. Detailed Implementation
[0021] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.
[0022] The following description, with reference to the accompanying drawings, outlines a method, apparatus, electronic device, and storage medium for determining the differential safety boundary according to embodiments of this application. Addressing the lack of refined and adaptive differential boundary determination methods in the related technologies mentioned in the background section, this application provides a method for determining the differential safety boundary. This method obtains an initial torque-speed difference boundary curve by fitting differential safety boundary determination data, thereby performing bench tests on the differential assembly to obtain bench test results. If the bench test results meet a first preset test condition, a subjective evaluation result of the differential assembly is obtained. If the subjective evaluation result meets a second preset test condition, the differential safety boundary data is determined. This solves the problem of the lack of refined and adaptive differential boundary determination methods in the related technologies, achieving an optimal balance between vehicle performance and protection effect through dynamically determining the differential safety boundary.
[0023] Specifically, Figure 1A flowchart of a method for determining the safety boundary of a differential provided in an embodiment of this application.
[0024] like Figure 1 As shown, the method for determining the differential safety boundary includes the following steps: In step S101, differential safety boundary setting data for the vehicle under multiple operating conditions is obtained.
[0025] In some embodiments, the differential safety boundary setting data includes motor torque, left wheel speed of the vehicle, right wheel speed of the vehicle, and time series.
[0026] It should be understood that the differential, as a key component of the vehicle's transmission system, directly affects the overall vehicle performance and driving safety. During use, the differential needs to be set with a differential limit curve. Operating beyond these limits can easily lead to differential erosion, breakage, and other malfunctions, thereby affecting the normal operation of the transmission system.
[0027] Specifically, this application embodiment can obtain real and extreme operating condition data of the vehicle through actual vehicle testing and real-time data acquisition. Specifically, this application embodiment first sets the vehicle in a test track or specific environment (such as open road climbing, icy and snowy road surface, off-road road surface, extreme turning, normal turning, etc.), and allows the vehicle to repeatedly perform operations such as acceleration, getting out of trouble, and drifting. At the same time, key signals such as motor torque, left and right wheel speed, and time are recorded at high frequency to obtain differential safety boundary determination data of the vehicle under multiple operating conditions.
[0028] In step S102, the initial torque-speed difference boundary curve is obtained by data fitting based on the differential safety boundary, and the differential assembly is bench tested based on the initial torque-speed difference boundary curve to obtain the bench test results.
[0029] In some embodiments, the initial torque-speed difference boundary curve is obtained by fitting data based on the differential safety boundary, including: filtering the differential safety boundary data to obtain filtered data; performing alignment preprocessing on the filtered data to obtain preprocessed data; and drawing a data scatter plot based on the preprocessed data, with torque and speed difference as key variables, and fitting the data scatter plot based on a preset polynomial fitting strategy to obtain the initial torque-speed difference boundary curve.
[0030] Among them, the initial torque-speed difference boundary curve is used to describe the correspondence between the initial critical torque and the speed difference; the differential assembly is a transmission assembly used to realize the adaptive adjustment of the speed of the left and right wheels of the vehicle; the preset polynomial fitting strategy is a mathematical modeling strategy that optimizes the fitting accuracy of the boundary curve based on measured data.
[0031] Specifically, embodiments of this application can extract scientific boundaries from data through data processing and curve fitting. Specifically, embodiments of this application can filter and align the collected differential safety boundary data, plot a scatter plot using torque and speed difference as key variables, and, based on a preset polynomial fitting strategy, fit an initial torque-speed difference boundary curve that can "summarize" or "enclose" all data points and distinguish between safe and dangerous areas. This curve can serve as... Figure 2 The first boundary curve in the curve is the initial theoretical basis for differential protection. The non-critical points in the curve can be manually adjusted. Figure 2 The second boundary curve is a boundary curve calculated based on historical experience and relevant formulas during the long-term development process. Figure 2 The measured data are discrete torque-speed difference data obtained through actual vehicle testing and preprocessing.
[0032] Furthermore, in this embodiment of the application, the preliminary boundary conditions can be used as test conditions for differential assembly testing (i.e. bench testing), and the verification is completed and the bench test results are obtained according to the number of cycles required to load the entire vehicle under the test conditions. The bench test results are shown in Table 1.
[0033] Table 1
[0034] In step S103, if the bench test results meet the first preset test conditions, the subjective evaluation results of the differential assembly are obtained, and if the subjective evaluation results meet the second preset test conditions, the differential safety boundary data are determined based on the initial torque-speed difference boundary curve.
[0035] The first and second preset test conditions can both be test conditions set by the user in advance. They can be test conditions obtained through a limited number of experiments or test conditions obtained through a limited number of computer simulations. No specific limitation is made here. The differential safety boundary data is determined to be the final version of the differential safety boundary data.
[0036] Specifically, once the initial torque-speed difference boundary curve has passed both bench testing (objective) and real-vehicle evaluation (subjective) verification, it is finally determined and solidified into the control code of the vehicle's electronic control unit (ECU), becoming a boundary data (i.e., determining the differential safety boundary data) in the vehicle's differential protection strategy.
[0037] Therefore, the embodiments of this application can solve the problems in related technologies where the differential boundary needs to be repeatedly explored and determined by differential bench testing, which consumes a lot of test samples and test resources, and can only produce a fixed boundary, which cannot be adapted to different vehicle models, vehicle weights and performances. This enables reliable control of the vehicle ECU, ensures stable operation of the differential and avoids abnormal risks.
[0038] Furthermore, in order to verify the effectiveness of the boundary curve in a controllable, repeatable, and low-cost environment and avoid damaging the whole vehicle, this application embodiment also needs to compare the bench test results with the first preset test conditions, which will be described below in conjunction with specific embodiments.
[0039] As one possible implementation, in some embodiments, after obtaining the bench test results by performing bench testing on the differential assembly based on the initial torque-speed difference boundary curve, the method further includes: if the bench test results do not meet the first preset test conditions, reducing the corresponding motor torque threshold of the initial torque-speed difference boundary curve; and re-performing the bench test based on the adjusted motor torque threshold until the new bench test results meet the first preset test conditions.
[0040] The motor torque threshold can be a user-preset threshold, a threshold obtained through a limited number of experiments, or a threshold obtained through a limited number of computer simulations; no specific limitations are imposed here.
[0041] Specifically, in bench testing, if the test results do not meet the first preset test conditions, it proves that the boundary curve is too aggressive. The bench test needs to be repeated after lowering the corresponding motor torque threshold of the initial torque-speed difference boundary curve, and this process is repeated until the bench test passes. The first preset test conditions can include failure scenarios such as gear breakage.
[0042] Furthermore, in order to verify the overall performance of the initial torque-speed difference boundary curve on the whole vehicle, this embodiment of the application also needs to compare the subjective evaluation results of the differential assembly with the second preset test conditions, which will be explained below with reference to specific embodiments.
[0043] As one possible implementation, in some embodiments, after obtaining the subjective evaluation result of the differential assembly, the method further includes: if the subjective evaluation result of the differential assembly does not meet the second preset test conditions, then replacing the differential assembly, and based on the new differential assembly, re-executing the step of obtaining differential safety boundary formulation data for the vehicle under multiple operating conditions.
[0044] Specifically, in this application embodiment, experienced test engineers can drive the vehicle in a real environment to experience the timing, strength, and smoothness of intervention when the protection (such as torque limiting) is triggered on the initial torque-speed difference boundary curve. They can also evaluate whether the protection provides safety while avoiding unpleasant abruptness or insufficient power, such as the inability to start slowly on an open road slope (subjective evaluation is the standard). If the subjective evaluation of the final specified boundary curve is unacceptable, a differential with stronger differential capacity needs to be replaced to meet the overall vehicle requirements, so as to ensure that the protection mechanism does not affect drivability, smoothness, and driver expectations.
[0045] Furthermore, to enable those skilled in the art to better understand the differential safety boundary determination method of this application, the following is combined with... Figure 3 and Figure 4 Specific embodiments will be described below.
[0046] Figure 3 This is a flowchart illustrating a method for determining the safety boundary of a differential, as provided in one embodiment of this application.
[0047] like Figure 3 As shown, the method for determining the safety boundary of a differential includes the following steps: S301, Beginning: Real Vehicle Testing.
[0048] S302, Data Acquisition: Acquire torque, wheel speed, and time series data under extreme operating conditions.
[0049] S303, Is the data valid? If yes, proceed to step S304; otherwise, proceed to step S302.
[0050] S304, Data Processing and Analysis: Fitting the initial torque-wheel speed differential boundary curve.
[0051] S305, Bench Test: Accelerated durability testing using the fitted curve as input.
[0052] S306, Did the bench test pass? If yes, proceed to step S308; otherwise, proceed to step S307.
[0053] S307, Revised Boundary Curve: Tighten Boundaries Based on Failure Data.
[0054] S308, subjective evaluation of the actual vehicle: verified by senior engineers in a real-world environment.
[0055] S309. Does the subjective evaluation meet the requirements? If yes, proceed to step S310; otherwise, proceed to step S311.
[0056] S310, Success: Final safety boundary determined.
[0057] S311, Subjective evaluation not met: Replace the differential (e.g., replace with a differential with a higher / lower total speed).
[0058] S312, a new real-vehicle test was conducted using the new differential.
[0059] Furthermore, Figure 4 This is a flowchart illustrating a differential protection system implementation method provided in one embodiment of this application.
[0060] like Figure 4 As shown, the method for implementing this differential protection system includes the following steps: S401, Start: Real-time vehicle monitoring, input torque and speed difference.
[0061] S402, Is the running point outside the first boundary line? If yes, proceed to step S404; otherwise, proceed to step S403.
[0062] S403, reset timer T1, allow normal torque operation.
[0063] S404, timer T1 increments.
[0064] S405, if timer T1 ≥ first boundary line allowable duration S, proceed to S406; otherwise, proceed to step S412.
[0065] S406, reduce torque to below the first boundary line and reset timer T1.
[0066] S407, Confirm: Is the current torque below the first boundary line and above the second boundary line? If yes, proceed to S409; otherwise, proceed to step S408.
[0067] S408, safe state, reset timer T2.
[0068] S409, timer T2 increments.
[0069] S410, if timer T2 ≥ second boundary line allowed duration T? If yes, then execute S411; otherwise, execute step S412.
[0070] S411, the torque must be reduced to below the second boundary line to run, and timer T2 must be reset.
[0071] S412, final torque output.
[0072] Specifically, in response to the differentiated requirements of the differential boundary, a dual boundary is defined in combination with the characteristics of the operating conditions: when testing extreme operating conditions such as split ramps, the required differential boundary is more aggressive and the duration is extremely short (defined as the allowable time of the first boundary line within 0.2 seconds), and the corresponding curve is the first differential boundary line; under non-extreme real vehicle operating conditions, the differential boundary is more conservative and the allowable time will be extended accordingly, and the corresponding curve is the second differential boundary line.
[0073] Further, the control steps are as follows: First, monitor the vehicle torque, speed difference, and time in real time to determine whether the operating point exceeds the first boundary line. If it does, start the timer to accumulate. When the over-limit time reaches the allowable time of the first boundary line, trigger the protection function to reduce the motor torque below the first boundary line. Then, continue to monitor the vehicle torque, speed difference, and time to determine whether the operating point is below the first boundary line and above the second boundary line. If it exceeds the first boundary line, start the timer to accumulate again. When the over-limit time reaches the allowable time of the second boundary line, trigger the protection function to reduce the motor torque below the second boundary line.
[0074] The differential safety boundary determination method proposed in this application can obtain an initial torque-speed difference boundary curve by fitting differential safety boundary setting data. This allows for bench testing of the differential assembly to obtain bench test results. If the bench test results meet a first preset test condition, a subjective evaluation result of the differential assembly is obtained. If the subjective evaluation result meets a second preset test condition, the differential safety boundary data is determined. This solves the problem of the lack of a refined and adaptive differential boundary setting method in related technologies, achieving an optimal balance between vehicle performance and protection effect through dynamically setting the differential safety boundary.
[0075] Next, the differential safety boundary determination device proposed in the embodiments of this application is described with reference to the accompanying drawings.
[0076] Figure 5 This is a block diagram of the differential safety boundary determination device proposed in an embodiment of this application.
[0077] like Figure 5 As shown, the differential safety boundary determination device 10 includes: an acquisition module 100, a test module 200, and a generation module 300.
[0078] The acquisition module 100 is used to acquire differential safety boundary setting data for the vehicle under multiple operating conditions; the testing module 200 is used to fit an initial torque-speed difference boundary curve based on the differential safety boundary setting data, and to perform bench testing on the differential assembly based on the initial torque-speed difference boundary curve to obtain bench test results; the generation module 300 is used to acquire the subjective evaluation result of the differential assembly when the bench test results meet the first preset test conditions, and to determine the differential safety boundary data based on the initial torque-speed difference boundary curve when the subjective evaluation results meet the second preset test conditions.
[0079] Optionally, in some embodiments, the test module 200 is specifically used to: filter the differential safety boundary setting data to obtain filtered data; perform alignment preprocessing on the filtered data to obtain preprocessed data; and based on the preprocessed data, draw a data scatter plot with torque and speed difference as key variables, and fit the data scatter plot based on a preset polynomial fitting strategy to obtain an initial torque-speed difference boundary curve.
[0080] Optionally, in some embodiments, after obtaining the bench test results by performing bench tests on the differential assembly based on the initial torque-speed difference boundary curve, the test module 200 is further configured to: reduce the motor torque threshold corresponding to the initial torque-speed difference boundary curve if the bench test results do not meet the first preset test conditions; and re-perform bench tests based on the adjusted motor torque threshold until the new bench test results meet the first preset test conditions.
[0081] Optionally, in some embodiments, after obtaining the subjective evaluation result of the differential assembly, the generation module 300 is further configured to: if the subjective evaluation result of the differential assembly does not meet the second preset test conditions, replace the differential assembly, and based on the new differential assembly, re-execute the step of obtaining the differential safety boundary formulation data of the vehicle under multiple operating conditions.
[0082] Optionally, in some embodiments, the differential safety boundary setting data includes motor torque, left wheel speed of the vehicle, right wheel speed of the vehicle, and time series.
[0083] It should be noted that the foregoing explanation of the differential safety boundary determination method embodiment also applies to the differential safety boundary determination device of this embodiment, and will not be repeated here.
[0084] The differential safety boundary determination device proposed in this application can obtain an initial torque-speed difference boundary curve by fitting differential safety boundary setting data, thereby performing bench tests on the differential assembly to obtain bench test results. If the bench test results meet a first preset test condition, a subjective evaluation result of the differential assembly is obtained. If the subjective evaluation result meets a second preset test condition, the differential safety boundary data is determined. This solves the problem of the lack of a refined and adaptive differential boundary setting method in related technologies, achieving an optimal balance between vehicle performance and protection effect by dynamically setting the differential safety boundary.
[0085] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include: The memory 601, the processor 602, and the computer program stored on the memory 601 and capable of running on the processor 602.
[0086] When the processor 602 executes the program, it implements the differential safety boundary determination method provided in the above embodiments.
[0087] Furthermore, the electronic device also includes: Communication interface 603 is used for communication between memory 601 and processor 602.
[0088] The memory 601 is used to store computer programs that can run on the processor 602.
[0089] The memory 601 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.
[0090] If the memory 601, processor 602, and communication interface 603 are implemented independently, then the communication interface 603, memory 601, and processor 602 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, Figure 6 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.
[0091] Optionally, in a specific implementation, if the memory 601, processor 602, and communication interface 603 are integrated on a single chip, then the memory 601, processor 602, and communication interface 603 can communicate with each other through an internal interface.
[0092] The processor 602 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.
[0093] This application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the following... Figure 1 The method for determining the differential safety boundary is shown.
[0094] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0095] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0096] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.
[0097] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.
[0098] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.
[0099] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.
[0100] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.
[0101] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.
Claims
1. A method for determining the safety boundary of a differential, characterized in that, include: Acquire differential safety boundary data for vehicles under multiple operating conditions; Based on the differential safety boundary, an initial torque-speed difference boundary curve is obtained by data fitting. Based on the initial torque-speed difference boundary curve, bench testing is performed on the differential assembly to obtain bench test results. If the bench test results meet the first preset test conditions, the subjective evaluation results of the differential assembly are obtained, and if the subjective evaluation results meet the second preset test conditions, the differential safety boundary data are determined based on the initial torque-speed difference boundary curve.
2. The method according to claim 1, characterized in that, The process of obtaining the initial torque-speed difference boundary curve by fitting data based on the differential safety boundary includes: The differential safety boundary specification data is filtered to obtain filtered data. The filtered data is then aligned and preprocessed to obtain preprocessed data. Based on the preprocessed data, a scatter plot is plotted with torque and speed difference as key variables, and the initial torque-speed difference boundary curve is obtained by fitting the scatter plot with a preset polynomial fitting strategy.
3. The method according to claim 1, characterized in that, After obtaining the bench test results by conducting bench tests on the differential assembly based on the initial torque-speed difference boundary curve, the process also includes: If the bench test results do not meet the first preset test conditions, the corresponding motor torque threshold of the initial torque-speed difference boundary curve is reduced. Based on the adjusted motor torque threshold, bench testing is repeated until the new bench test results meet the first preset test conditions.
4. The method according to claim 1, characterized in that, After obtaining the subjective evaluation results of the differential assembly, the following steps are also included: If the subjective evaluation result of the differential assembly does not meet the second preset test conditions, the differential assembly is replaced, and based on the new differential assembly, the step of obtaining differential safety boundary determination data for the vehicle under multiple operating conditions is re-executed.
5. The method according to any one of claims 1-4, characterized in that, The differential safety boundary setting data includes motor torque, left wheel speed, right wheel speed, and time series.
6. A differential safety boundary determination device, characterized in that, include: The acquisition module is used to acquire differential safety boundary specification data for the vehicle under multiple operating conditions; The testing module is used to obtain an initial torque-speed difference boundary curve by fitting data according to the differential safety boundary, and to perform bench testing on the differential assembly based on the initial torque-speed difference boundary curve to obtain bench test results. The generation module is used to obtain the subjective evaluation result of the differential assembly when the bench test result meets the first preset test conditions, and to determine the differential safety boundary data based on the initial torque-speed difference boundary curve when the subjective evaluation result meets the second preset test conditions.
7. The apparatus according to claim 6, characterized in that, The test module is specifically used for: The differential safety boundary specification data is filtered to obtain filtered data. The filtered data is then aligned and preprocessed to obtain preprocessed data. Based on the preprocessed data, a scatter plot is plotted with torque and speed difference as key variables, and the initial torque-speed difference boundary curve is obtained by fitting the scatter plot with a preset polynomial fitting strategy.
8. The apparatus according to claim 6, characterized in that, After obtaining the bench test results by performing bench tests on the differential assembly based on the initial torque-speed difference boundary curve, the test module is further used for: If the bench test results do not meet the first preset test conditions, the corresponding motor torque threshold of the initial torque-speed difference boundary curve is reduced. Based on the adjusted motor torque threshold, bench testing is repeated until the new bench test results meet the first preset test conditions.
9. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the differential safety boundary determination method as described in any one of claims 1-5.
10. A computer-readable storage medium storing a computer program, characterized in that, When the program is executed by the processor, it implements the differential safety boundary determination method as described in any one of claims 1-5.