A kind of automobile OBC automatic testing method and system

Abstract

The invention discloses an automatic test method and system for an automobile OBC, and relates to the technical field of new energy automobiles. The automatic test method and system for an automobile OBC include a harmonic distortion test module, a dynamic response test module, a leakage protection test module, and a test visualization module. By acquiring the current and voltage data of the OBC input terminal, analyzing the dynamic characteristics of the electrical waveform, and generating a harmonic distortion test report, the accuracy and efficiency of harmonic distortion detection are improved. The dynamic response test module applies different load changes, analyzes steady-state errors, overshoots, and undershoots, evaluates the dynamic response performance of the OBC, and ensures the response speed and reliability of the OBC in actual use. By performing a leakage test on the automobile OBC, the leakage current data is obtained, and the protection performance of the OBC under leakage conditions is evaluated to ensure compliance with safety standards and generate a test report. The visualization module intuitively displays the test results, which improves the efficiency and accuracy of the test.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to an automobile OBC automatic testing method and system. Background Art

[0002] With the global attention to environmental protection and energy conservation, automotive electrification has become an important trend in the development of the automotive industry, especially the popularity of electric vehicles and hybrid vehicles. As a key component of electric vehicles, the on-board charger is responsible for converting the AC power of the external power grid into DC power suitable for the on-board battery. In this context, ensuring the safety, reliability and performance of OBC has become a key link in the development of automotive electrification.

[0003] The automotive parts testing process is gradually shifting from manual operation to automation and intelligence. Traditional OBC testing methods rely on manual operation, which is inefficient and may not fully cover all fault scenarios under complex electrical conditions. In order to improve test efficiency, reduce costs, and ensure the comprehensiveness of the test, it is particularly important to develop an OBC test system based on automation and intelligent analysis. This system can automatically complete test tasks such as fault injection, electrical quantity measurement, and protection function verification, while realizing automatic data collection and analysis.

[0004] For example, the announcement number is CN108896842A, which is an automatic test system and method for the OBC of an on-board charger for new energy vehicles. It includes an AC power supply, a DC power supply, a high-voltage load, a power analyzer, an oscilloscope, an industrial computer, a code scanning device, a USB integrated system, a relay board, an on-board charger to be tested, a low-voltage load and a CAN device; the technical solution provided by the present invention can perform a comprehensive and fully automatic test on the charging function and protection function of the main output and auxiliary output of the on-board charger; the system adopts intelligent centralized control, which can realize the combination and batch execution of multiple test items, and the entire test process can be automatically executed by the host computer test software platform, and a test report is automatically generated after the test is completed; the test equipment can be used alone or in combination to realize systematic testing. The present invention performs a comprehensive and fully automatic test on the charging function and protection function of the on-board charger, and automatically generates a test report; it has the characteristics of high test accuracy and test efficiency, and low test cost.

[0005] However, existing OBC test systems mainly focus on basic electrical performance testing, such as power analysis and simple fault detection, but usually have problems such as limited test scope, insufficient data analysis depth, and low intelligence level, which cannot fully cover complex electrical testing needs. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides an automobile OBC automatic testing method and system, which solves the problems of the above-mentioned background technology.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: an automobile OBC automatic test system, comprising the following modules: a harmonic distortion test module, a dynamic response test module, a leakage protection test module, and a visualization module; the harmonic distortion test module is used to obtain the input current data and voltage data of the automobile OBC, analyze the dynamic characteristics of the input current and voltage waveforms, evaluate the electrical waveform quality of the automobile OBC, and generate an automobile OBC harmonic distortion test report; the dynamic response test module is used to apply load changes of different amplitudes and frequencies to the automobile OBC through a load simulator, analyze the steady-state error, overshoot and undershoot of the output current and voltage of the automobile OBC after the load change, evaluate the dynamic response characteristics of the automobile OBC, and generate a dynamic response test report; the leakage protection test module is used to perform a leakage test on the automobile OBC, obtain the leakage current data of the automobile OBC, analyze the protection performance of the automobile OBC under leakage conditions, evaluate whether the leakage protection function of the automobile OBC meets the leakage safety standard, and generate a leakage protection test report; the visualization module is used to visualize the automobile OBC harmonic distortion test report, dynamic response test report and leakage protection test report.

[0008] Furthermore, the specific process of analyzing the dynamic characteristics of the input current and voltage waveforms and evaluating the electrical waveform quality of the automobile OBC is as follows: based on the input current data and voltage data of the automobile OBC; denoising and filtering the current data and voltage data to eliminate the noise in the signal; calculating the amplitude error value of the current and voltage waveforms and the effective value of the current and voltage waveforms, applying Fourier transform to perform harmonic analysis, obtain the harmonic distortion rate, and evaluate the electrical waveform quality index of the automobile OBC; based on the electrical waveform quality index of the automobile OBC, compare it with the set electrical waveform quality index threshold of the automobile OBC to evaluate the electrical waveform quality of the automobile OBC.

[0009] Furthermore, the specific process of obtaining the electrical waveform quality index of the automobile OBC is as follows: comprehensively analyze the harmonic distortion rate, the effective values ​​of current and voltage, and the current and voltage amplitude error values, assign weights to the harmonic distortion rate, the effective values ​​of current and voltage, and the current and voltage amplitude error values, and calculate the electrical waveform quality index by weighted calculation.

[0010] Furthermore, the specific process of analyzing the steady-state error, overshoot and undershoot of the output current and voltage of the automobile OBC after the load change is as follows: apply load changes of different amplitudes and frequencies to the automobile OBC through a load simulator, and record the output current and voltage data of the automobile OBC in real time; analyze the current and voltage waveforms after the load change, and measure the current steady-state error and the voltage steady-state error; determine the maximum peak value of the output current and voltage during the load change, and calculate the overshoot as the difference between the peak value and the steady-state value; determine the minimum valley value of the output current and voltage during the load change, and calculate the undershoot as the difference between the valley value and the steady-state value.

[0011] Furthermore, the specific process of evaluating the dynamic response characteristics of the automobile OBC is as follows: obtaining the time required for the current and voltage waveforms to reach a steady state from the start of load change, conducting a comprehensive analysis of the steady-state error, overshoot and undershoot of the current and voltage, obtaining the dynamic response performance index, and evaluating the dynamic response characteristics of the automobile OBC.

[0012] Furthermore, the specific process of performing a leakage test on the automobile OBC and obtaining the leakage current data of the automobile OBC is as follows: placing the automobile OBC in a set test environment, using a leakage simulator to impose leakage conditions on the automobile OBC, obtaining the time from the start of leakage to the activation of the protection device and the leakage current value when the protection device is activated, and calculating the leakage current change rate; the leakage current data of the automobile OBC includes the leakage current change rate, the protection action current and the leakage protection response time.

[0013] Furthermore, the protection performance of the automobile OBC under leakage conditions is analyzed, and the specific process of evaluating whether the automobile OBC leakage protection function meets the leakage safety standard is as follows: the protection action current value and the leakage protection response time are respectively calculated with the set response time threshold and the protection current threshold, and compared with the allowable deviation value of the response time and the allowable deviation value of the protection current to obtain the automobile OBC leakage protection performance index; when the automobile OBC leakage protection performance index is greater than or equal to the set automobile OBC leakage protection performance index threshold, it indicates that the automobile OBC leakage protection function meets the leakage safety standard; when the automobile OBC leakage protection performance index is less than the set automobile OBC leakage protection performance index threshold, it indicates that the automobile OBC leakage protection function does not meet the leakage safety standard.

[0014] An automatic test method for an automobile OBC comprises the following steps: S1. acquiring input terminal current data and voltage data of an automobile OBC, analyzing the dynamic characteristics of input current and voltage waveforms, evaluating the electrical waveform quality of the automobile OBC, and generating an automobile OBC harmonic distortion test report; S2. applying load changes of different amplitudes and frequencies to the automobile OBC through a load simulator, analyzing the steady-state error, overshoot and undershoot of the output current and voltage of the automobile OBC after the load change, evaluating the dynamic response characteristics of the automobile OBC, and generating a dynamic response test report; S3. performing a leakage test on the automobile OBC, acquiring the leakage current data of the automobile OBC, analyzing the protection performance of the automobile OBC under leakage conditions, evaluating whether the leakage protection function of the automobile OBC meets the leakage safety standard, and generating a leakage protection test report; S4. visually displaying the automobile OBC harmonic distortion test report, the dynamic response test report and the leakage protection test report.

[0015] The present invention has the following beneficial effects:

[0016] (1) This kind of automobile OBC automatic test system can fully automatically test multiple performance indicators of OBC by setting up harmonic distortion test module, dynamic response test module, leakage protection test module and test visualization module. By obtaining the current and voltage data of the OBC input terminal, analyzing the dynamic characteristics of the electrical waveform, evaluating the quality of the electrical waveform, and generating a detailed harmonic distortion test report, the accuracy and efficiency of harmonic distortion detection are improved, which helps to ensure the stability of the electrical waveform and the reliability of the electrical system. The dynamic response test module applies load changes of different amplitudes and frequencies through a load simulator, automatically analyzes the steady-state error, overshoot and undershoot of the OBC, evaluates its dynamic response characteristics and generates a test report, accurately evaluates the dynamic response performance of the OBC, ensures its reliability and response speed in actual use, and improves the dynamic performance testing capability of electrical test equipment.

[0017] (2) This is an automatic test method for automobile OBC, which simulates leakage conditions, collects leakage current data and evaluates the protection performance of OBC under leakage conditions to ensure that it meets safety standards and generates a leakage protection test report. Through automated leakage protection testing, the accuracy and timeliness of leakage detection are enhanced, and the safety and compliance of the OBC system are improved. The visualization module can intuitively display the test results of harmonic distortion, dynamic response and leakage protection, so that users can quickly understand the test situation.

[0018] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a flow chart of an automobile OBC automatic testing system.

[0020] Figure 2 The present invention is a flow chart of an automobile OBC automatic testing method. DETAILED DESCRIPTION

[0021] The embodiments of the present application solve the problems of low efficiency, incomplete coverage and insufficient testing accuracy of traditional manual testing through an automobile OBC automatic testing method and system.

[0022] The overall idea of ​​the problem in the embodiment of this application is as follows:

[0023] Obtain the input current and voltage data of the automobile OBC, analyze the dynamic characteristics of the input current and voltage waveforms, evaluate the electrical waveform quality of the automobile OBC, and generate the automobile OBC harmonic distortion test report.

[0024] The load simulator is used to apply load changes of different amplitudes and frequencies to the vehicle OBC, and the steady-state error, overshoot and undershoot of the vehicle OBC output current and voltage after the load change are analyzed to evaluate the dynamic response characteristics of the vehicle OBC and generate a dynamic response test report.

[0025] Conduct leakage test on the vehicle OBC, obtain leakage current data of the vehicle OBC, analyze the protection performance of the vehicle OBC under leakage conditions, evaluate whether the leakage protection function of the vehicle OBC meets the leakage safety standards, and generate a leakage protection test report.

[0026] Visually display the automobile OBC harmonic distortion test report, dynamic response test report and leakage protection test report.

[0027] See also Figure 1The embodiment of the present invention provides a technical solution: an automobile OBC automatic test system, comprising the following modules: a harmonic distortion test module, a dynamic response test module, a leakage protection test module, and a visualization module; the harmonic distortion test module is used to obtain the input current data and voltage data of the automobile OBC, analyze the dynamic characteristics of the input current and voltage waveforms, evaluate the electrical waveform quality of the automobile OBC, and generate the automobile OBC harmonic distortion test report; the dynamic response test module is used to apply load changes of different amplitudes and frequencies to the automobile OBC through a load simulator, analyze the steady-state error, overshoot and undershoot of the output current and voltage of the automobile OBC after the load change, evaluate the dynamic response characteristics of the automobile OBC, and generate a dynamic response test report; the leakage protection test module is used to perform a leakage test on the automobile OBC, obtain the leakage current data of the automobile OBC, analyze the protection performance of the automobile OBC under leakage conditions, evaluate whether the leakage protection function of the automobile OBC meets the leakage safety standard, and generate a leakage protection test report; the visualization module is used to visualize the automobile OBC harmonic distortion test report, the dynamic response test report, and the leakage protection test report.

[0028] In this implementation, harmonic distortion refers to the non-sinusoidal components that appear in the current or voltage waveform. For the on-board charger (OBC), harmonic distortion reflects the quality of its electrical waveform during operation. If the harmonic distortion is large, it may cause the efficiency of the device to decrease or generate unstable factors. Dynamic response refers to the ability of the OBC to quickly restore the output current and voltage to a steady state when the load changes. This test simulates load changes of different amplitudes and frequencies to detect the steady-state error, overshoot and undershoot of the OBC under transient change conditions to evaluate its stability and response speed under complex working conditions. Steady-state error: After the load changes, the deviation of the OBC output current or voltage from transient recovery to steady state is called steady-state error. This parameter is used to evaluate the accuracy of the OBC after the load changes. Overshoot and undershoot: During the load change process, the output current and voltage of the OBC may fluctuate briefly, which is called overshoot when it exceeds the steady-state value and undershoot when it is lower than the steady-state value. These fluctuations reflect the adaptability of the device to load changes, and excessive overshoot or undershoot may affect the performance of the device. The leakage protection function means that when the OBC detects abnormal leakage, it can quickly cut off the power supply to avoid safety accidents. By simulating leakage conditions, the response time and operating current of the OBC can be tested to ensure that it meets electrical safety standards. Test visualization: The visualization module displays all test results in the form of graphs and data tables, allowing users to intuitively understand the various performance indicators of the OBC, including harmonic distortion, dynamic response and leakage protection.

[0029] Specifically, the specific process of analyzing the dynamic characteristics of input current and voltage waveforms and evaluating the electrical waveform quality of the automobile OBC is as follows: based on the input current data and voltage data of the automobile OBC; denoising and filtering the current data and voltage data to eliminate noise in the signal; calculating the amplitude error value of the current and voltage waveforms and the effective value of the current and voltage waveforms, applying Fourier transform to perform harmonic analysis, obtain the harmonic distortion rate, and evaluate the electrical waveform quality index of the automobile OBC; based on the electrical waveform quality index of the automobile OBC, compare it with the set electrical waveform quality index threshold of the automobile OBC to evaluate the electrical waveform quality of the automobile OBC.

[0030] In this embodiment, the acquired current and voltage data are de-noised and filtered to eliminate noise and signal interference. This ensures the accuracy of the data and provides more reliable input for subsequent analysis. The amplitude error and effective value of the processed current and voltage waveforms are calculated. The amplitude error refers to the deviation between the actual waveform and the ideal waveform, while the effective value is used to measure the overall energy level of the waveform. These indicators can reflect the waveform accuracy and stability when the OBC is working. The current and voltage waveforms are converted from the time domain to the frequency domain by applying Fourier transform to analyze the harmonic components in the waveform. Through harmonic analysis, the harmonic distortion rate can be calculated. This value represents the proportion of non-sinusoidal components in the waveform. The higher the harmonic distortion rate, the worse the waveform quality. Based on the harmonic distortion rate and other related data, the electrical waveform quality index of the automotive OBC is calculated. This index is used to quantify the electrical waveform performance of the OBC. A higher index indicates poor waveform quality, which may affect the performance and safety of the equipment. The calculated electrical waveform quality index is compared with the set waveform quality standard threshold. If the index is lower than the threshold, it means that the waveform quality meets the standard; if it exceeds the threshold, it needs to be adjusted or improved.

[0031] Specifically, the specific process of obtaining the electrical waveform quality index of the automobile OBC is as follows: comprehensively analyze the harmonic distortion rate, the effective values ​​of current and voltage, and the current and voltage amplitude error values, assign weights to the harmonic distortion rate, the effective values ​​of current and voltage, and the current and voltage amplitude error values, and calculate the electrical waveform quality index by weighted calculation.

[0032] In this embodiment, the amplitude error is calculated, and the current amplitude error formula is: ;Parameter explanation: The measured current amplitude, : Nominal current amplitude, voltage amplitude error formula is, ;Parameter explanation, The measured voltage amplitude, Nominal voltage amplitude. Current effective value The calculation formula is as follows, ;Parameter explanation, Instantaneous current value, Measurement time period, voltage RMS The formula is as follows, ;Parameter explanation, The instantaneous voltage value, The measurement time period. The formula for calculating the harmonic distortion rate is as follows: ; Parameter explanation, Fundamental frequency current amplitude, The current amplitude of each order harmonic and the calculation formula of the electrical waveform quality index are: ; Parameter explanation, The weight of the harmonic distortion rate, : The weight of the effective value of the current, The weight of the voltage RMS value, : weight of current amplitude error, The weight of the voltage amplitude error.

[0033] Specifically, the specific process of analyzing the steady-state error, overshoot and undershoot of the output current and voltage of the automobile OBC after the load change is as follows: apply load changes of different amplitudes and frequencies to the automobile OBC through a load simulator, and record the output current and voltage data of the automobile OBC in real time; analyze the current and voltage waveforms after the load change, and measure the current steady-state error and the voltage steady-state error; determine the maximum peak value of the output current and voltage during the load change, and calculate the overshoot as the difference between the peak value and the steady-state value; determine the minimum valley value of the output current and voltage during the load change, and calculate the undershoot as the difference between the valley value and the steady-state value.

[0034] In this implementation scheme, a load simulator is used to apply load changes of different amplitudes and frequencies to the automobile OBC, and the output current and voltage data of the automobile OBC are recorded in real time. The specific analysis process is as follows: Load application and data recording: Use a load simulator to apply load changes of different amplitudes and frequencies, and record the waveform data of current and voltage in real time. Steady-state error measurement: Obtain steady-state value: In the stable stage after the load change, record the steady-state values ​​of the output current and voltage. Calculate steady-state error: Current steady-state error: Calculate the difference between the steady-state value of the current and the nominal value. Voltage steady-state error: Calculate the difference between the steady-state value of the voltage and the nominal value. Overshoot calculation: Determine the maximum peak value: Record the maximum value of the output current and voltage during the load change. Calculate overshoot: The difference between the peak value and the steady-state value. Undershoot calculation: Determine the minimum valley value: Record the minimum value of the output current and voltage during the load change. Calculate undershoot: The difference between the valley value and the steady-state value.

[0035] Specifically, the specific process of evaluating the dynamic response characteristics of the automobile OBC is as follows: obtain the time required for the current and voltage waveforms to reach a steady state from the start of load change, conduct a comprehensive analysis of the steady-state error, overshoot and undershoot of the current and voltage, obtain the dynamic response performance index, and evaluate the dynamic response characteristics of the automobile OBC.

[0036] In this implementation scheme, the steady-state error calculation process is as follows: the current steady-state error formula is: ;in, : Current steady-state error, which represents the average absolute difference between the actual current value and the expected steady-state current value, :At time point The actual current measurement value, : Set the current steady-state value (target value), The number of sampling points during steady state. Voltage steady state error formula: ; : Voltage steady-state error, which represents the average absolute difference between the actual voltage value and the expected steady-state voltage value. :At time point The actual voltage measurement value, The set voltage steady-state value (target value), The number of sampling points during steady state. The overshoot and undershoot calculation process is as follows, current overshoot: in, Current overshoot, which is the percentage difference between the peak current and the steady-state value. : The maximum peak value of current during load change. The steady-state value of the current after a load change. Voltage overshoot: ; : Voltage overshoot, which represents the percentage difference between the voltage peak value and the steady-state value. The maximum peak value of the voltage during load change, The steady-state value of the voltage after a load change. The current undershoot formula is: , : Current undershoot, which represents the percentage difference between the current valley value and the steady-state value. The minimum valley value of the current during load change, The steady-state value of the current after a load change. Voltage undershoot formula: ,in, : Voltage undershoot, which represents the percentage difference between the voltage valley value and the steady-state value. : The minimum valley value of voltage during load change, The steady-state value of the voltage after a load change. Dynamic response performance index The calculation formula is,

[0037] , : Weight of the current steady-state error. : Weight of voltage steady-state error, The weight of the current overshoot, : The weight of voltage overshoot, The weight of the current undershoot, : The weight of voltage undershoot.

[0038] Specifically, the specific process of conducting a leakage test on the automobile OBC and obtaining the leakage current data of the automobile OBC is as follows: placing the automobile OBC in a set test environment, using a leakage simulator to impose leakage conditions on the automobile OBC, obtaining the time from the start of leakage to the activation of the protection device and the leakage current value when the protection device is activated, and calculating the leakage current change rate; the leakage current data of the automobile OBC includes the leakage current change rate, protection action current and leakage protection response time.

[0039] In this implementation, the car OBC (on-board charger) is placed in a set test environment. It involves controlling factors such as ambient temperature and humidity to ensure the consistency of test conditions. A leakage simulator is used to impose leakage conditions on the car OBC. The leakage simulator creates an environment similar to actual leakage by simulating current leakage to test the protection performance of the OBC. Protection device activation time: the time from the start of leakage to the activation of the OBC protection device. This is a key data for evaluating the reaction speed of the protection device.

[0040] Leakage current value when the protection device is activated: The actual leakage current when the protection device is activated. This represents the leakage current level of the OBC before the protection mechanism is activated. Calculate the leakage current change rate, the leakage current change rate calculation formula is: ;in: It is the leakage current value when the protection device is activated. is the leakage current value when the leakage condition starts, It is the protection device activation time. It is the time when the leakage condition starts. Leakage current change rate: describes the speed of change of leakage current, reflects the severity of leakage and the response sensitivity of the protection system. Protection action current: the leakage current value when the protection device is activated, indicating the action point of the protection device, ensuring that the protection is triggered in time when the leakage reaches this current value. Leakage protection response time: the time from the beginning of leakage to the activation of the protection device, evaluates the response speed of the protection system, and ensures that the system can take timely measures when leakage occurs.

[0041] Specifically, the specific process of analyzing the protection performance of the automobile OBC under leakage conditions and evaluating whether the automobile OBC leakage protection function meets the leakage safety standard is as follows: the protection action current value and the leakage protection response time are respectively calculated with the set response time threshold and the protection current threshold, and compared with the allowable deviation value of the response time and the allowable deviation value of the protection current to obtain the automobile OBC leakage protection performance index; when the automobile OBC leakage protection performance index is greater than or equal to the set automobile OBC leakage protection performance index threshold, it indicates that the automobile OBC leakage protection function meets the leakage safety standard; when the automobile OBC leakage protection performance index is less than the set automobile OBC leakage protection performance index threshold, it indicates that the automobile OBC leakage protection function does not meet the leakage safety standard.

[0042] In this implementation scheme, the calculation formula of the leakage protection performance index is as follows: ; Parameter explanation, The protection action current value is the leakage current when the protection device is activated. : Protection current threshold, that is, the set leakage protection current standard, : Allowable deviation value of protection current, that is, the allowable error range of protection action current, The leakage protection response time refers to the time required for the protection device to start from the beginning of leakage. Response time threshold, that is, the set leakage protection response time standard. The allowable deviation value of response time, that is, the allowable error range of response time.

[0043] See also Figure 2 , an automatic test method for an automobile OBC, comprising the following steps: S1. obtaining input current data and voltage data of an automobile OBC, analyzing the dynamic characteristics of input current and voltage waveforms, evaluating the electrical waveform quality of the automobile OBC, and generating an automobile OBC harmonic distortion test report; S2. applying load changes of different amplitudes and frequencies to the automobile OBC through a load simulator, analyzing the steady-state error, overshoot and undershoot of the output current and voltage of the automobile OBC after the load change, evaluating the dynamic response characteristics of the automobile OBC, and generating a dynamic response test report; S3. performing a leakage test on the automobile OBC, obtaining the leakage current data of the automobile OBC, analyzing the protection performance of the automobile OBC under leakage conditions, evaluating whether the leakage protection function of the automobile OBC meets the leakage safety standard, and generating a leakage protection test report; S4. visually displaying the automobile OBC harmonic distortion test report, dynamic response test report and leakage protection test report.

[0044] In this implementation scheme, step S1: harmonic distortion test, collect current data and voltage data at the input end of the automobile OBC. Analyze waveforms: perform dynamic characteristic analysis on these current and voltage waveforms, mainly including denoising, filtering, calculating amplitude error, effective value, etc. Evaluate quality: perform harmonic analysis using methods such as Fourier transform, calculate harmonic distortion rate, and thus evaluate the quality of electrical waveforms. Generate report: Generate an automobile OBC harmonic distortion test report based on the analysis results, which describes the electrical waveform quality of the automobile OBC in detail. Step S2: Dynamic response test, apply load: use a load simulator to apply load changes of different amplitudes and frequencies to the automobile OBC. Analyze response: record the current and voltage waveforms after the load changes, and measure steady-state error, overshoot and undershoot. Evaluate characteristics: combine these measured values ​​to evaluate the dynamic response characteristics of the automobile OBC. Generate report: generate a dynamic response test report based on the evaluation results, describing the performance of the automobile OBC under dynamic load. Step S3: Leakage protection test execution test: perform leakage test on the automobile OBC and obtain leakage current data. Analyze protection performance: Evaluate the protection performance of the vehicle OBC under leakage conditions, and analyze the response time and protection current of the protection device. Generate report: Generate a leakage protection test report to evaluate whether the leakage protection function of the vehicle OBC meets the leakage safety standard. Step S4: Visual display, display report: Visually display the test reports generated by steps S1, S2 and S3 so that users can intuitively view the test results and evaluate the overall performance of the vehicle OBC.

[0045] In summary, this application has at least the following effects:

[0046] By setting up the harmonic distortion test module, dynamic response test module, leakage protection test module and test visualization module, multiple performance indicators of OBC can be fully automatically tested. By acquiring the current and voltage data at the input of the OBC, analyzing the dynamic characteristics of the electrical waveform, evaluating the quality of the electrical waveform, and generating a detailed harmonic distortion test report, the accuracy and efficiency of harmonic distortion detection are improved, which helps to ensure the stability of the electrical waveform and the reliability of the electrical system. The dynamic response test module applies load changes of different amplitudes and frequencies through a load simulator, automatically analyzes the steady-state error, overshoot and undershoot of the OBC, evaluates its dynamic response characteristics and generates a test report, accurately evaluates the dynamic response performance of the OBC, ensures its reliability and response speed in actual use, and improves the dynamic performance testing capability of electrical testing equipment. By simulating leakage conditions, collecting leakage current data and evaluating the protection performance of OBC under leakage conditions, it is ensured that it meets safety standards and generates a leakage protection test report. Through automated leakage protection testing, the accuracy and timeliness of leakage detection are enhanced, and the safety and compliance of the OBC system are improved. The visualization module can intuitively display the test results of harmonic distortion, dynamic response and leakage protection, allowing users to quickly understand the test situation.

[0047] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0048] The present invention is described with reference to flowcharts and / or block diagrams of systems, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0049] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0050] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0051] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0052] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An automobile OBC automatic testing system, characterized in that: Includes the following modules: harmonic distortion test module, dynamic response test module, leakage protection test module, test visualization module; The harmonic distortion test module is used to obtain the input terminal current data and voltage data of the automobile OBC, analyze the dynamic characteristics of the input current and voltage waveforms, evaluate the electrical waveform quality of the automobile OBC, and generate the automobile OBC harmonic distortion test report; The dynamic response test module is used to apply load changes of different amplitudes and frequencies to the automobile OBC through a load simulator, analyze the steady-state error, overshoot and undershoot of the output current and voltage of the automobile OBC after the load change, evaluate the dynamic response characteristics of the automobile OBC, and generate a dynamic response test report; The leakage protection test module is used to perform leakage test on the vehicle OBC, obtain leakage current data of the vehicle OBC, analyze the protection performance of the vehicle OBC under leakage conditions, evaluate whether the leakage protection function of the vehicle OBC meets the leakage safety standard, and generate a leakage protection test report; The visualization module is used to visualize the automobile OBC harmonic distortion test report, dynamic response test report and leakage protection test report; The specific process of analyzing the dynamic characteristics of input current and voltage waveforms and evaluating the electrical waveform quality of the automobile OBC is as follows: According to the input current data and voltage data of the automobile OBC; De-noising and filtering the current data and voltage data to eliminate the noise in the signal; Calculate the amplitude error value and effective value of the current and voltage waveforms, apply Fourier transform to perform harmonic analysis, obtain the harmonic distortion rate, and evaluate the electrical waveform quality index of the vehicle OBC; Based on the electrical waveform quality index of the automobile OBC, the electrical waveform quality of the automobile OBC is compared with a set threshold value of the electrical waveform quality index of the automobile OBC to evaluate the electrical waveform quality of the automobile OBC; The specific process of obtaining the electrical waveform quality index of the automobile OBC is as follows: The harmonic distortion rate, the effective values ​​of current and voltage, and the current and voltage amplitude error values ​​are comprehensively analyzed, weights are assigned to the harmonic distortion rate, the effective values ​​of current and voltage, and the current and voltage amplitude error values, and the electrical waveform quality index is calculated by weighted calculation.

2. The automobile OBC automatic test system according to claim 1, characterized in that: The specific process of analyzing the steady-state error, overshoot and undershoot of the vehicle OBC output current and voltage after load changes is as follows: The load simulator applies load changes of different amplitudes and frequencies to the vehicle OBC, and the output current and voltage data of the vehicle OBC are recorded in real time; Analyze the current and voltage waveforms after load changes, and measure the current steady-state error and voltage steady-state error; Determine the maximum peak value of output current and voltage during load change, and calculate the overshoot as the difference between the peak value and the steady-state value; Determine the minimum valley value of the output current and voltage during load changes, and calculate the undershoot as the difference between the valley value and the steady-state value.

3. The automobile OBC automatic test system according to claim 2, characterized in that: The specific process of evaluating the dynamic response characteristics of the vehicle OBC is as follows: Obtain the time required from the start of load change to the current and voltage waveforms reaching steady state, conduct a comprehensive analysis of the steady-state error, overshoot and undershoot of current and voltage, obtain the dynamic response performance index, and evaluate the dynamic response characteristics of the vehicle OBC.

4. The automobile OBC automatic test system according to claim 3 is characterized in that: The specific process of conducting a leakage test on the vehicle OBC and obtaining the leakage current data of the vehicle OBC is as follows: Place the vehicle OBC in a set test environment, use a leakage simulator to impose leakage conditions on the vehicle OBC, obtain the time from the start of leakage to the activation of the protection device and the leakage current value when the protection device is activated, and calculate the leakage current change rate; The leakage current data of the automobile OBC includes the leakage current change rate, the protection action current value and the leakage protection response time.

5. The automobile OBC automatic test system according to claim 4 is characterized in that: The specific process of analyzing the protection performance of the automobile OBC under leakage conditions and evaluating whether the automobile OBC leakage protection function meets the leakage safety standards is as follows: The protection action current value and the leakage protection response time are calculated by difference with the set response time threshold and protection current threshold, respectively, and compared with the allowable deviation value of the response time and the allowable deviation value of the protection current to obtain the vehicle OBC leakage protection performance index; When the vehicle OBC leakage protection performance index is greater than or equal to the set vehicle OBC leakage protection performance index threshold, it means that the vehicle OBC leakage protection function meets the leakage safety standard; When the vehicle OBC leakage protection performance index is less than the set vehicle OBC leakage protection performance index threshold, it means that the vehicle OBC leakage protection function does not meet the leakage safety standard.

6. An automobile OBC automatic testing method, applied to an automobile OBC automatic testing system according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Obtain the input current data and voltage data of the automobile OBC, analyze the dynamic characteristics of the input current and voltage waveforms, evaluate the electrical waveform quality of the automobile OBC, and generate the automobile OBC harmonic distortion test report; S2. Apply load changes of different amplitudes and frequencies to the vehicle OBC through a load simulator, analyze the steady-state error, overshoot and undershoot of the output current and voltage of the vehicle OBC after the load change, evaluate the dynamic response characteristics of the vehicle OBC, and generate a dynamic response test report; S3. Perform a leakage test on the vehicle OBC, obtain the leakage current data of the vehicle OBC, analyze the protection performance of the vehicle OBC under leakage conditions, evaluate whether the leakage protection function of the vehicle OBC meets the leakage safety standard, and generate a leakage protection test report; S4. Visually display the automobile OBC harmonic distortion test report, dynamic response test report and leakage protection test report.

Images