A vehicle high-pressure system testing device, method, equipment and medium

Abstract

This application provides a testing device, method, equipment, and medium for a vehicle high-voltage system. The device includes: a system connection module for connecting a bench control system and a vehicle control system, and acquiring bench control parameters and vehicle control parameters; a bidirectional adjustable high-voltage channel for connecting high-voltage components of the vehicle, adjusting the channel state according to the high-voltage components to be tested, and performing ripple injection and ripple acquisition on the high-voltage components to obtain ripple acquisition data; a ripple self-learning module for determining the predicted resonance point of the high-voltage components based on bench control parameters, vehicle control parameters, and ripple acquisition data; and an injection and testing module for generating a test waveform based on the ripple acquisition data and the predicted resonance point, and injecting the test waveform into the high-voltage components through the bidirectional adjustable high-voltage channel for testing the vehicle high-voltage system. The integrated design based on the bidirectional adjustable high-voltage channel improves the accuracy and efficiency of the test.

Description

Technical Field

[0001] This application relates to the field of new energy vehicle testing technology, and in particular to a testing device, method, equipment and medium for a whole vehicle high voltage system. Background Technology

[0002] With the increasing demand for high integration and high power in new energy vehicles, the ripple voltage / current of the vehicle's high-voltage system is also increasing. The increase in high-voltage ripple directly affects the electromagnetic compatibility (EMC) of the vehicle's high-voltage system and the reliability of high-voltage system components.

[0003] However, existing high-voltage system testing methods require rewiring of the testing equipment when performing immunity tests at different points, making it difficult to guarantee the consistency of the two test conditions; furthermore, the timing synchronization accuracy of the acquisition and injection actions is difficult to guarantee, affecting the accuracy and efficiency of the test results. Summary of the Invention

[0004] The purpose of this application is to provide a vehicle high-voltage system testing device, method, electronic device, and storage medium that can solve the problems of difficulty in ensuring the consistency of test conditions and the synchronization of acquisition and injection in traditional methods, which affect the accuracy and efficiency of test results.

[0005] In a first aspect, embodiments of this application provide a vehicle high-voltage system testing device, the device comprising: a system connection module, a bidirectional adjustable high-voltage channel, a ripple self-learning module, and a ripple injection and testing module; The system connection module is used to connect the test bench control system and the vehicle control system, and to collect test bench control parameters and vehicle control parameters. The bidirectional adjustable high-voltage channel is used to connect the high-voltage components of the vehicle. The channel state of the bidirectional adjustable high-voltage channel is adjusted according to the high-voltage components to be tested, and ripple injection and ripple acquisition are performed on the high-voltage components to obtain the ripple acquisition data of the high-voltage components. The ripple self-learning module is used to determine the predicted resonance point of the high-voltage component based on the test bench control parameters, the vehicle control parameters, and the ripple acquisition data. The injection and testing module is used to generate a test waveform based on the ripple acquisition data and the predicted resonance point, and inject the test waveform into the high-voltage component through the bidirectional adjustable high-voltage channel to perform a vehicle high-voltage system test.

[0006] Optionally, the bidirectional adjustable high-voltage channel includes at least two high-voltage channels; the channel states include: ripple injection state and ripple acquisition state; the ripple injection state represents injecting a preset impedance analysis waveform, or the test waveform, into the corresponding high-voltage component and acquiring the ripple acquisition data of the high-voltage component after ripple injection; the ripple acquisition state is used to acquire the ripple acquisition data of high-voltage components that have not undergone ripple injection; wherein, the vehicle high-voltage system includes at least two high-voltage components; when ripple injection is performed on one of the high-voltage components, the high-voltage channel connected to the high-voltage component undergoing ripple injection is set to the ripple injection state, and the remaining high-voltage channels are in the ripple acquisition state.

[0007] Optionally, the ripple acquisition data includes: first ripple acquisition data and second ripple acquisition data; the first ripple acquisition data represents the operating data of each high-voltage component without injecting ripple into the preset impedance analysis waveform and test waveform; the second ripple acquisition data represents the data acquired when the preset impedance analysis waveform is injected into the high-voltage component for impedance characteristic analysis.

[0008] Optionally, the ripple self-learning module is used to determine the test conditions based on the bench control parameters and the vehicle control parameters; and to collect first ripple acquisition data under different test conditions through the bidirectional adjustable high-voltage channel; The ripple self-learning module is also used to sequentially inject preset impedance analysis waveforms into different high-voltage components under different test conditions to obtain the second ripple acquisition data of the high-voltage components; determine the impedance characteristics of the vehicle high-voltage system based on the second ripple acquisition data; and determine the predicted resonance of the high-voltage components based on the impedance characteristics, the first ripple acquisition data, and the vehicle control parameters.

[0009] Optionally, the injection and testing module is used to determine the target ripple segment based on the first ripple acquisition data and the predicted resonant point, and to generate the test waveform based on the target ripple segment.

[0010] Optionally, the ripple acquisition data further includes third ripple acquisition data; the injection and testing module is used to inject the test waveform into the high-voltage component to be tested; acquire the third ripple acquisition data of each high-voltage component; when the third ripple acquisition data is less than or equal to a preset test threshold, adjust the amplitude or frequency of the test waveform until the vehicle control parameters show a preset fault parameter; determine the failure threshold of the vehicle high-voltage system based on the test waveform injected when the preset fault parameter appears.

[0011] Secondly, embodiments of this application provide a method for testing a vehicle's high-voltage system, the method comprising: Obtain bench control parameters and vehicle control parameters; According to the bidirectional adjustable high-voltage channel, ripple injection and ripple acquisition are performed on the high-voltage components of the vehicle high-voltage system to obtain the ripple acquisition data of the high-voltage components. The predicted resonance point under different test conditions is determined based on the bench control parameters, the vehicle control parameters, and the ripple acquisition data. A test waveform is generated based on the ripple acquisition data and the predicted resonance point; The test waveform is injected into the high-voltage component through the bidirectional adjustable high-voltage channel, and the vehicle high-voltage system is tested based on the test waveform to determine the failure threshold of the vehicle high-voltage system.

[0012] Optionally, the step of injecting the test waveform into the high-voltage component through the bidirectional adjustable high-voltage channel, and testing the vehicle high-voltage system based on the test waveform to determine the failure threshold of the vehicle high-voltage system includes: Inject the test waveform into the high-voltage component that needs to be tested; The ripple acquisition data of each high-voltage component after the test waveform is injected is obtained through the bidirectional adjustable high-voltage channel. If the ripple acquisition data is less than or equal to a preset test threshold, adjust the amplitude or frequency of the test waveform until the vehicle control parameters show a preset fault parameter. The failure threshold is determined based on the test waveform corresponding to the preset fault parameters.

[0013] Thirdly, embodiments of this application provide an electronic device, including: a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the method described above.

[0014] Fourthly, embodiments of this application provide a computer-readable storage medium on which a computer program is stored, which, when executed by a processor, implements the method described above.

[0015] Compared with the prior art, the embodiments of this application have the following advantages: In this embodiment, the vehicle high-voltage system testing device includes: a system connection module, a bidirectional adjustable high-voltage channel, a ripple self-learning module, and a ripple injection and testing module. The system connection module connects the bench control system and the vehicle control system, acquiring bench control parameters and vehicle control parameters. The bidirectional adjustable high-voltage channel connects to the vehicle's high-voltage components. The channel state is adjusted according to the high-voltage components to be tested, performing ripple injection and ripple acquisition on the high-voltage components to obtain ripple acquisition data. The ripple self-learning module determines the predicted resonance point of the high-voltage components based on the bench control parameters, vehicle control parameters, and ripple acquisition data. The injection and testing module generates a test waveform based on the ripple acquisition data and the predicted resonance point, and injects the test waveform into the high-voltage components through the bidirectional adjustable high-voltage channel for vehicle high-voltage system testing. By integrating ripple acquisition and injection, data acquisition and testing can be performed with a single device. The bidirectional adjustable high-voltage channel solves the problem of needing to rewire when performing immunity tests at different points, making it difficult to ensure consistency between two test conditions, thus improving testing accuracy and efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a connection diagram of a vehicle high-voltage system testing device provided in an embodiment of this application; Figure 2 This is a connection diagram of another vehicle high-voltage system testing device provided in an embodiment of this application; Figure 3 This is a flowchart illustrating the steps of a vehicle high-voltage system testing method provided in an embodiment of this application; Figure 4 This is a schematic diagram of an electronic device provided in an embodiment of this application; Figure 5 This is a schematic diagram of a computer-readable storage medium provided in an embodiment of this application. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein. Furthermore, in this application, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0020] The following description, in conjunction with the accompanying drawings, details a vehicle high-voltage system testing device, method, electronic device, and storage medium provided in this application through specific embodiments and application scenarios.

[0021] With the increasing demand for high integration and high power in new energy vehicles, the ripple voltage / current of the vehicle's high-voltage system is also increasing. The increase in high-voltage ripple directly affects the electromagnetic compatibility (EMC) of the vehicle's high-voltage system and the reliability of high-voltage system components.

[0022] However, existing high-voltage system testing equipment mainly targets components and conducts tests on laboratory benches, without placing them in the electrical and load environment of the entire vehicle; Furthermore, currently, ripple acquisition testing (passive monitoring) and ripple injection testing (active interference) are usually completed by two separate sets of equipment. The test devices are discrete and the process is cumbersome. For example, a high-bandwidth oscilloscope and a high-voltage differential probe are used to acquire ripple, and then a separate ripple injection device is used to perform immunity testing. Each time immunity testing is performed at different points, the wiring needs to be reconnected. The timing synchronization accuracy of the acquisition and injection actions is difficult to guarantee, which affects the accuracy and repeatability of the test results and makes it difficult to guarantee the consistency of the two test conditions. Secondly, traditional ripple injection tests often use standardized, single-form ripple waveforms (such as sine waves and triangular waves), while the ripples generated in real vehicle operation are complex, time-varying, and strongly correlated with the load. Discrete testing cannot instantly convert the real-time acquired ripple characteristics into injection waveforms, and cannot simulate the most demanding real-world operating conditions.

[0023] Therefore, there is an urgent need for an integrated solution to overcome the above-mentioned shortcomings.

[0024] Reference Figure 1 This document illustrates a connection diagram of a vehicle high-voltage system testing device provided in an embodiment of this application, which may specifically include the following: In this embodiment, the vehicle high-voltage system testing device includes: a system connection module, a bidirectional adjustable high-voltage channel, a ripple self-learning module, and a ripple injection and testing module; The system connection module is used to connect the bench control system and the vehicle control system to collect bench control parameters and vehicle control parameters. Specifically, the system connection module of the vehicle high-voltage system test device includes L1 port and L2 port. Both L1 port and L2 port are communication interfaces, which can be CAN / FD, Ethernet, GPIB, etc.

[0025] The vehicle can be mounted on a four-motor VIL (Vehicle-in-the-Loop) test bench or a rotary drum test bench. The test bench control system is used to simulate the test bench control parameters of the vehicle under different operating conditions (e.g., road resistance, torque, etc.). The test bench control system is connected to the L2 port to obtain the test bench control parameters of the vehicle under different operating conditions in real time. The vehicle control system is responsible for coordinating the operating status of various high-voltage components and the driving status of the vehicle. It connects to the vehicle control system through the L1 port, collects vehicle control parameters, and determines the operating status and driving status of each high-voltage component. The driving status can include: parking in D gear, rapid acceleration, constant speed driving, overtaking, coasting, emergency braking, climbing, charging, etc.

[0026] By using bench control parameters and vehicle control parameters under different operating conditions, data support is provided for ripple learning and ripple testing of various high-voltage components of the vehicle under different operating conditions.

[0027] A bidirectional adjustable high-voltage channel is used to connect the high-voltage components of a vehicle. The channel state of the bidirectional adjustable high-voltage channel is adjusted according to the high-voltage components to be tested, and ripple injection and ripple acquisition are performed on the high-voltage components to obtain the ripple acquisition data of the high-voltage components. In this embodiment, the bidirectional adjustable high-voltage channel includes at least two high-voltage ports (e.g., Figure 1 The high-voltage ports (H1 to H6) are connected to the high-voltage components via voltage acquisition / injection lines and current acquisition lines. The channel state of the corresponding high-voltage port can be adjusted according to the high-voltage component to be tested, and ripple acquisition and ripple injection can be performed on the high-voltage component to be tested. Data acquisition and testing can be realized through a single device, and ripple acquisition data of different high-voltage components can be obtained simultaneously.

[0028] In specific implementations, such as Figure 2The diagram shows a connection schematic of another vehicle high-voltage system testing device provided in this application embodiment. The high-voltage components may include: a front drive assembly, a battery pack assembly, a rear drive assembly, a compressor assembly, a PTC (Positive Temperature Coefficient) assembly, and a DC-DC (Direct Current to Direct Current) converter assembly. The electric vehicle consists of several components: a DC-DC converter assembly and an OBC (On-Board Charger) assembly. The front drive assembly primarily comprises a motor, reducer, and controller, providing power to the front wheels. The battery pack assembly integrates multiple battery modules, a battery management system (BMS), a thermal management system, and structural components, supplying power not only to the drive motor but also to the vehicle's electrical systems. The rear drive assembly, similar to the front drive assembly, is a high-voltage system that powers the rear wheels, typically consisting of a rear-mounted motor, reducer, and inverter. The compressor assembly compresses the refrigerant, enabling in-vehicle cooling and battery thermal management. The PTC assembly is used for the electric vehicle's heating system and battery preheating. The DC-DC converter is a high-voltage to low-voltage power conversion device in electric vehicles, supplying power to low-voltage electrical equipment (such as lights, instruments, and audio systems). The OBC assembly converts external AC power to DC power to charge the battery.

[0029] The H1~H6 high-voltage ports are connected to the DC buses of each high-voltage system in the vehicle through the power distribution unit, which is used to collect / inject ripple voltage and ripple current for different high-voltage components.

[0030] Optionally, the bidirectional adjustable high-voltage channel has a high-voltage isolation and conditioning module that provides safe isolation and automatically adapts to different voltage levels (such as 400V / 800V platforms). It also has a high-speed, high-precision ADC (Analog-to-Digital Converter) module for digitizing the data acquired in ripple acquisition mode.

[0031] The ripple self-learning module is used to determine the predicted resonance point of the high-voltage component based on the test bench control parameters, vehicle control parameters, and ripple acquisition data. In this embodiment, after acquiring test bench control parameters and vehicle control parameters through the system connection module, and acquiring ripple acquisition data through the bidirectional adjustable high-voltage channel, ripple voltage acquisition data and ripple current acquisition data for different operating conditions and different high-voltage components can be obtained.

[0032] Since different high-voltage components (such as H1 channel for battery pack, H2 channel for DC-DC converter, H3 channel for OBC, etc.) have different impedance variation patterns at different frequencies, if a high-voltage component experiences a sudden change in impedance phase and an abnormal increase in ripple amplitude envelope under specific operating conditions, it can be determined that the component has a resonance risk at that frequency.

[0033] This embodiment analyzes the ripple voltage and ripple current data collected under different operating conditions and different high-voltage components using a ripple self-learning module to determine the potential resonance points that are likely to excite the resonance phenomenon of high-voltage components under different operating conditions, that is, to predict the resonance points.

[0034] The injection and testing module is used to generate test waveforms based on ripple acquisition data and predicted resonance points, and inject the test waveforms into high-voltage components through a bidirectional adjustable high-voltage channel for testing the vehicle's high-voltage system.

[0035] In this embodiment, after the ripple self-learning module learns the predicted resonance point of the high-voltage component that is easy to excite the resonance phenomenon of the high-voltage component under different operating conditions, the test waveform can be generated based on the predicted resonance point and the ripple acquisition data, on the basis of the data collected by the corresponding high-voltage component under real driving conditions, so as to avoid the test scenario being fragmented and the realism being insufficient. The test waveform is then injected into the high-voltage component through a bidirectional adjustable high-voltage channel to perform a test on the vehicle's high-voltage system.

[0036] In this embodiment, the vehicle high-voltage system testing device includes: a system connection module, a bidirectional adjustable high-voltage channel, a ripple self-learning module, and a ripple injection and testing module. The system connection module connects the bench control system and the vehicle control system, acquiring bench control parameters and vehicle control parameters. The bidirectional adjustable high-voltage channel connects to the vehicle's high-voltage components. The channel state is adjusted according to the high-voltage components to be tested, performing ripple injection and ripple acquisition on the high-voltage components to obtain ripple acquisition data. The ripple self-learning module determines the predicted resonance point of the high-voltage components based on the bench control parameters, vehicle control parameters, and ripple acquisition data. The injection and testing module generates a test waveform based on the ripple acquisition data and the predicted resonance point, and injects the test waveform into the high-voltage components through the bidirectional adjustable high-voltage channel for vehicle high-voltage system testing. By integrating ripple acquisition and injection, data acquisition and testing can be performed with a single device. The bidirectional adjustable high-voltage channel solves the problem of needing to rewire when performing immunity tests at different points, making it difficult to ensure consistency between two test conditions, thus improving testing accuracy and efficiency.

[0037] In one embodiment of this application, the bidirectional adjustable high-voltage channel includes at least two high-voltage channels; the channel states include: ripple injection state and ripple acquisition state; the ripple injection state represents injecting a preset impedance analysis waveform, or the test waveform, into the corresponding high-voltage component and acquiring the ripple acquisition data of the high-voltage component after ripple injection; the ripple acquisition state is used to acquire the ripple acquisition data of high-voltage components that have not undergone ripple injection; wherein, the vehicle high-voltage system includes at least two high-voltage components; when ripple injection is performed on one of the high-voltage components, the high-voltage channel connected to the high-voltage component undergoing ripple injection is set to the ripple injection state, and the remaining high-voltage channels are in the ripple acquisition state.

[0038] In this embodiment of the application, the channel states of the bidirectional adjustable high-voltage channel include: ripple injection state and ripple acquisition state.

[0039] Specifically, the ripple injection state is used to perform ripple injection, which can inject a preset impedance analysis waveform for impedance characteristic analysis into the corresponding high-voltage component to analyze the predicted resonance point of the corresponding high-voltage component, or inject a test waveform for testing into the corresponding high-voltage component; at the same time, the ripple acquisition data of the high-voltage component after ripple injection is obtained. The ripple acquisition mode is used for ripple collection, which can collect ripple acquisition data from high-voltage components that have not undergone ripple injection.

[0040] In practical implementation, when it is necessary to inject ripple into any high-voltage component in the vehicle, the bidirectional adjustable high-voltage channel connected to that high-voltage component can be automatically set to ripple injection state, while the other high-voltage channels are in ripple acquisition state.

[0041] For example, such as Figure 2 As shown, when injecting ripple into the front drive assembly, channel H1 can be set to ripple injection mode, while channels H2 to H6 automatically adjust to ripple acquisition mode, enabling rapid switching between ripple acquisition and injection without the need for separate ripple acquisition and injection testing equipment. Furthermore, while injecting ripple, the ripple voltage / current at the near end of each high-voltage system can be simultaneously acquired, along with control information from the bench control system (such as dynamometer speed and torque) and key vehicle parameters (vehicle speed, SOC, motor speed, throttle opening, etc.). The amplitude, frequency, or mode of the injected ripple can be adjusted based on the response of the acquired ripple data until the system failure threshold is reached, thereby quantifying the system's ripple immunity margin.

[0042] Furthermore, after ripple injection into the front drive assembly, ripple injection can be performed sequentially into the compressor assembly, PTC assembly, DC-DC assembly, OBC assembly, and front drive assembly. There is no need to reconnect the connection lines of each port. The high-voltage component being tested can be changed by changing the channel status of the corresponding bidirectional adjustable high-voltage channel, which greatly improves the testing efficiency.

[0043] Optionally, the vehicle high-voltage system test device also includes a multi-functional switch matrix and a protection circuit. The multi-functional switch matrix is ​​used to adjust the channel status of different bidirectional adjustable high-voltage channels to achieve rapid switching between ripple acquisition and ripple injection. The protection circuit is used to provide overvoltage protection, overcurrent protection, or short-circuit protection for the vehicle high-voltage system test device.

[0044] In this embodiment, the bidirectional adjustable high-voltage channel can simultaneously perform high-voltage ripple injection and real-time acquisition of the ripple voltage at the ripple injection point of the entire vehicle, realizing the collinearity and shared module of ripple voltage injection and ripple voltage acquisition.

[0045] In one embodiment of this application, the ripple acquisition data includes: first ripple acquisition data and second ripple acquisition data; the first ripple acquisition data represents the operating data of each high-voltage component without ripple injection of preset impedance analysis waveforms and test waveforms; the second ripple acquisition data represents the data acquired when the preset impedance analysis waveform is injected into the high-voltage component for impedance characteristic analysis.

[0046] In this embodiment, the ripple acquisition data includes: first ripple acquisition data and second ripple acquisition data; the first ripple acquisition data represents the actual operating data of each high-voltage component when the preset impedance analysis waveform and test waveform are not injected with ripple; the second ripple acquisition data represents the data acquired when the preset impedance analysis waveform is injected into the high-voltage component for impedance characteristic analysis.

[0047] In one embodiment of this application, the ripple self-learning module is used to determine the test conditions based on the bench control parameters and the vehicle control parameters; and to collect first ripple acquisition data under different test conditions through the bidirectional adjustable high-voltage channel; The ripple self-learning module is also used to sequentially inject preset impedance analysis waveforms into different high-voltage components under different test conditions to obtain the second ripple acquisition data of the high-voltage components; determine the impedance characteristics of the vehicle high-voltage system based on the second ripple acquisition data; and determine the predicted resonance point of the high-voltage components based on the impedance characteristics, the second ripple acquisition data, and the vehicle control parameters.

[0048] In this embodiment, the ripple self-learning module can determine the test conditions based on the bench control parameters and the vehicle control parameters. Then, it collects the second ripple acquisition data under different test conditions through the bidirectional adjustable high-voltage channel. The second ripple acquisition data completely records the time-domain waveforms of the voltage and current ripples of each high-voltage module in the vehicle's high-voltage system. By analyzing the first ripple acquisition data, the spectral characteristics, impedance characteristic curves, and other data of each high-voltage component under different conditions can be determined.

[0049] Specifically, the ripple self-learning module can sequentially inject preset impedance analysis waveforms into corresponding high-voltage components under different test conditions according to test requirements, and perform frequency sweep analysis on the high-voltage system under various operating conditions of the vehicle (for example, the voltage ripple injection amplitude of the preset impedance analysis waveform can be set to 4Vpp, and the ripple injection frequency can be set to 10~150KHz), obtain the second ripple acquisition data of each high-voltage component, and then analyze the second ripple acquisition data. Based on the time-domain waveforms of voltage and current ripples obtained after sequentially injecting the preset impedance analysis waveforms into the corresponding high-voltage components, Ohm's theorem can be used to analyze and obtain the impedance characteristic curves of each high-voltage system under various operating conditions. Combined with the ripple test waveforms and the vehicle operating conditions, the potential resonance points of each high-voltage component of the vehicle's high-voltage system can be obtained.

[0050] In its implementation, the ripple self-learning module compares the spectral analysis results of the first ripple acquisition data with the impedance characteristic curve obtained from the second ripple acquisition data. When the impedance characteristic curve shows a valley at a certain frequency, and this frequency coincides with the high-amplitude harmonic frequency in the measured ripple spectrum under the vehicle's operating conditions, it is marked as a candidate resonance point. For the high-voltage components (front drive assembly, battery pack assembly, rear drive assembly, compressor assembly, PTC assembly, DC-DC assembly, and OBC assembly) corresponding to channels H1 to H6, the impedance change law of each high-voltage component at this frequency is analyzed. If a sudden change in impedance amplitude and concentrated ripple energy occur in a specific operating condition (such as channel H4 during overtaking), it is confirmed that the high-voltage component has a resonance risk at this frequency. Then, the vehicle is adjusted to this operating condition (such as overtaking) through the bench control system and the vehicle control system, and the resonance risk of the high-voltage component (the DC-DC assembly corresponding to channel H4) is verified again. If the resonance risk still exists, it is determined as a predicted resonance point.

[0051] In this embodiment, the ripple self-learning module, through operating condition-driven ripple self-learning combined with time-domain waveform analysis and swept-frequency impedance testing, can accurately acquire the spectral characteristics and impedance curves of each high-voltage component. When the impedance valley frequency coincides with the measured high-amplitude harmonic, and a phase abrupt change and ripple energy concentration occur under specific operating conditions, the potential resonance point can be identified. Dual verification on both bench and vehicle platforms effectively avoids misjudgments and provides data support for subsequent generation of test waveforms.

[0052] In one embodiment of this application, the injection and testing module is used to determine a target ripple segment based on the first ripple acquisition data and the predicted resonant point, and to generate the test waveform based on the target ripple segment.

[0053] In this embodiment, the injection and testing module can automatically extract ripple segments with predicted resonance points from the ripple self-learning module (that is, ripple data within a preset range of predicted resonance points), amplify the ripple segments with predicted resonance points based on a preset algorithm, and superimpose them with the first ripple acquisition data to generate an enhanced real ripple as a test waveform.

[0054] Specifically, the time-domain data of the first ripple acquisition data and the ripple segment with the predicted resonance point can be Fourier transformed to obtain the corresponding frequency-domain data. The horizontal axis represents the frequency, and the vertical axis represents the ripple amplitude at the corresponding frequency. Then, the frequency corresponding to the ripple peak value under the frequency-domain data of the ripple segment with the predicted resonance point is extracted. This frequency is injected into the first ripple acquisition data in the form of a sine wave for fusion. Then, the amplitude is amplified according to a preset scaling factor (for example, it can be set to 1.2) to obtain enhanced ripple data, which is used as the test waveform. The test waveform is based on the characteristics of the original measured waveform and is amplified to test the ripple immunity of the system.

[0055] The vehicle high-voltage system testing device in this embodiment has two modes: learning and attack. The ripple self-learning module learns the time-domain and frequency-domain characteristics of the vehicle's ripple under various real operating conditions (such as rapid acceleration, regenerative braking, charging, etc.). Then, the injection and testing module accurately injects the test waveform generated by the learned real ripple characteristics into the high-voltage component under test.

[0056] By using a learning-attack dual-mode test based on real data, the ripple environment that may induce resonance under different extreme operating conditions can be accurately reproduced, effectively exposing the weak links of the vehicle's high-voltage system under critical conditions and improving the accuracy of the test.

[0057] In one embodiment of this application, the ripple acquisition data further includes third ripple acquisition data; the injection and testing module is used to inject the test waveform into the high-voltage component to be tested; acquire the third ripple acquisition data of each high-voltage component; when the third ripple acquisition data is less than or equal to a preset test threshold, adjust the amplitude or frequency of the test waveform until the vehicle control parameters show a preset fault parameter; determine the failure threshold of the vehicle high-voltage system based on the test waveform injected when the preset fault parameter appears.

[0058] In this embodiment of the application, the ripple acquisition data also includes third ripple acquisition data, which characterizes the ripple signal of each high-voltage component after the test waveform is injected into the high-voltage component.

[0059] Specifically, the injection and testing module injects the test waveform into the high-voltage component to be tested through a bidirectional adjustable high-voltage channel, monitors and acquires the third ripple acquisition data of each high-voltage component, and performs data analysis on the third ripple acquisition data. If the third ripple acquisition data is less than or equal to the preset test threshold, the amplitude or frequency of the test waveform is adjusted until the vehicle control parameters show the preset fault parameters. Then, the failure threshold is determined based on the test waveform injected when the preset fault parameters appear.

[0060] In practical implementation, after generating the test waveform, the bidirectional adjustable high-voltage channel corresponding to a certain high-voltage component can be switched to ripple injection mode, while the bidirectional adjustable high-voltage channels of other high-voltage components are set to ripple acquisition mode. The test waveform is then injected for testing, and the ripple signals of each high-voltage component in the vehicle's high-voltage system are monitored in real time. The ripple signal of the vehicle's high-voltage system is compared with the design threshold. If it is less than or equal to the design threshold, the amplitude of the injected ripple is gradually increased (or the frequency is changed) according to a preset adjustment ratio. Once the ripple exceeds the permissible range or a preset fault parameter indicating a functional / performance failure of the high-voltage system is detected, the injected ripple parameter at this moment is recorded as the "failure threshold," and injection is stopped. A boundary curve of "ripple amplitude - system state" is generated based on the adjustment process.

[0061] Optionally, the injection and testing module can also generate a test report; the test report shall include at least the original ripple characteristics, the injected test waveform, the impedance characteristic curves of each high-voltage component, the resonant point, the failure threshold, and the boundary curve.

[0062] This embodiment dynamically adjusts the ripple parameters of the injected test waveform based on the actual operating condition waveform, gradually approaching the system's failure threshold. When the ripple signal exceeds the design threshold or triggers preset fault parameters, the failure threshold is automatically locked. This method avoids the conservatism of traditional fixed threshold testing, accurately identifies the actual withstand capability of each high-voltage component (battery pack, DC-DC converter, drive assembly, etc.) in the resonant frequency band, improves the accuracy of test results, provides quantifiable engineering boundary basis for the high-voltage safety of the entire vehicle, and significantly reduces the quality risks caused by ripple resonance.

[0063] This application's embodiment includes a system connection module for connecting the bench control system and the vehicle control system, acquiring bench control parameters and vehicle control parameters; a bidirectional adjustable high-voltage channel for connecting the vehicle's high-voltage components, adjusting the channel state according to the high-voltage components to be tested, performing ripple injection and ripple acquisition on the high-voltage components to obtain ripple acquisition data; a ripple self-learning module for determining the predicted resonance point of the high-voltage components based on bench control parameters, vehicle control parameters, and ripple acquisition data; and an injection and testing module for generating test waveforms based on ripple acquisition data and predicted resonance points, and injecting the test waveforms into the high-voltage components through the bidirectional adjustable high-voltage channel for testing the vehicle's high-voltage system. By integrating ripple acquisition and injection, data acquisition and testing can be performed with a single device; the bidirectional adjustable high-voltage channel solves the problem of needing to rewire when performing immunity tests at different points, making it difficult to ensure consistency between two test conditions, thus improving testing accuracy and efficiency.

[0064] It should be noted that, for the sake of simplicity, the device embodiments are described as a series of actions. However, those skilled in the art should understand that the embodiments of this application are not limited to the described order of actions, because according to the embodiments of this application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of this application.

[0065] Reference Figure 3 The following is a flowchart illustrating the steps of a vehicle high-voltage system testing method provided in an embodiment of this application: Step 101: Obtain bench control parameters and vehicle control parameters; In this embodiment, bench control parameters can be obtained from the bench control system connected to the L2 port and vehicle control parameters can be obtained from the vehicle control system connected to the L1 port through the L1 port and L2 port of the system connection module, respectively.

[0066] Step 102: Perform ripple injection and ripple acquisition on the high-voltage components of the vehicle high-voltage system according to the bidirectional adjustable high-voltage channel, and obtain the ripple acquisition data of the high-voltage components. In this embodiment, when it is necessary to inject ripple into any high-voltage component in the high-voltage system of the whole vehicle, the bidirectional adjustable high-voltage channel connected to the high-voltage component can be automatically set to the ripple injection state, while the other high-voltage channels are in the ripple acquisition state, thereby obtaining the ripple acquisition data of each high-voltage component.

[0067] Step 103: Determine the predicted resonance point under different test conditions based on the bench control parameters, the vehicle control parameters, and the ripple acquisition data; Specifically, the specific operating conditions and driving status of the vehicle can be determined by using bench control parameters and vehicle control parameters. By performing frequency sweep analysis on each high-voltage component under different operating conditions according to the preset impedance analysis waveform, and combining the ripple test waveform and the vehicle's operating conditions, the potential resonance points of each high-voltage component in the vehicle's high-voltage system under different test conditions can be determined.

[0068] Step 104: Generate a test waveform based on the ripple acquisition data and the predicted resonance point; In this embodiment of the application, after obtaining the potential resonance points of each high-voltage component of the vehicle high-voltage system under different test conditions, the ripple segment with the predicted resonance point is extracted by the ripple self-learning module. Based on the actual ripple acquisition data, the ripple segment with the predicted resonance point and the actual ripple acquisition data are amplified and superimposed to generate the test waveform.

[0069] Step 105: Inject the test waveform into the high-voltage component through the bidirectional adjustable high-voltage channel, test the vehicle high-voltage system based on the test waveform, and determine the failure threshold of the vehicle high-voltage system.

[0070] In this embodiment, after generating the test waveform, the injection and testing module injects the test waveform into the high-voltage component to be tested through a bidirectional adjustable high-voltage channel. At the same time, it monitors and acquires the ripple acquisition data of each high-voltage component after the test waveform is injected, and performs data analysis. If the ripple acquisition data is less than or equal to the preset test threshold, the amplitude or frequency of the test waveform is adjusted until the vehicle control parameters show the preset fault parameters. Then, the failure threshold is determined based on the test waveform injected when the preset fault parameters appear.

[0071] In this embodiment, bench control parameters and vehicle control parameters are acquired; ripple injection and ripple acquisition are performed on the high-voltage components of the vehicle's high-voltage system using a bidirectional adjustable high-voltage channel to obtain ripple acquisition data for the high-voltage components; predicted resonance points under different test conditions are determined based on the bench control parameters, vehicle control parameters, and ripple acquisition data; test waveforms are generated based on the ripple acquisition data and predicted resonance points; the test waveforms are injected into the high-voltage components through the bidirectional adjustable high-voltage channel; and the vehicle's high-voltage system is tested based on the test waveforms to determine the failure threshold of the vehicle's high-voltage system. By integrating ripple acquisition and injection into a single device, data acquisition and testing can be performed. After generating test waveforms based on ripple acquisition data and predicted resonance points acquired under real-world conditions, rewiring is unnecessary; testing can be performed simply by adjusting the channel state of the bidirectional adjustable high-voltage channel, improving testing accuracy and efficiency.

[0072] In one embodiment of this application, the step of injecting the test waveform into the high-voltage component through the bidirectional adjustable high-voltage channel, testing the vehicle high-voltage system based on the test waveform, and determining the failure threshold of the vehicle high-voltage system includes: Inject the test waveform into the high-voltage component that needs to be tested; The ripple acquisition data of each high-voltage component after the test waveform is injected is obtained through the bidirectional adjustable high-voltage channel. If the ripple acquisition data is less than or equal to a preset test threshold, adjust the amplitude or frequency of the test waveform until the vehicle control parameters show a preset fault parameter. The failure threshold is determined based on the test waveform corresponding to the preset fault parameters.

[0073] Specifically, after generating the test waveform, the bidirectional adjustable high-voltage channel corresponding to a certain high-voltage component can be switched to the ripple injection state, while the bidirectional adjustable high-voltage channels of the other high-voltage components are set to the ripple acquisition state. The test waveform is then injected for testing, and the ripple signal of each high-voltage component in the vehicle's high-voltage system is monitored in real time. The ripple signal of the vehicle's high-voltage system is compared with the design threshold in real time. If it is less than or equal to the design threshold, the amplitude of the injected ripple is gradually increased (or the frequency is changed) according to a preset adjustment ratio. Once the ripple exceeds the permissible range or a preset fault parameter indicating a functional / performance failure of the high-voltage system is detected, the injected ripple parameter at that moment is recorded as the "failure threshold," and injection is stopped. A boundary curve of "ripple amplitude - system state" is generated based on the adjustment process. As the method embodiments are basically similar to the device embodiments, they are described in a relatively simple manner. For relevant details, please refer to the description of the method embodiments.

[0074] like Figure 4 As shown, in another embodiment provided in this application, an electronic device 300 is also provided, including a memory 310 and a processor 320. The memory 310 and the processor 320 are connected via a bus for communication. The memory 310 stores a computer program, which can run on the processor 320 to implement the above steps.

[0075] like Figure 5 As shown, in another embodiment provided in this application, a computer-readable storage medium 401 is also provided, which stores a computer program that implements the methods described in the above embodiments when executed by a processor.

[0076] Those skilled in the art will understand that embodiments of this application can be provided as methods, apparatus, or computer program products. Therefore, embodiments of this application can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Furthermore, embodiments of this application can take the form of computer program products 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.

[0077] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0078] Those skilled in the art will understand that embodiments of this application can be provided as methods, apparatus, or computer program products. Therefore, embodiments of this application can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Furthermore, embodiments of this application can take the form of computer program products 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.

[0079] This application describes embodiments with reference to flowchart illustrations and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0080] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0081] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal equipment, causing a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0082] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0083] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0084] The present invention provides a detailed description of a vehicle high-voltage system testing device. Specific examples have been used to illustrate the principle and implementation of the invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the invention. Therefore, the content of this specification should not be construed as a limitation of the invention.

Claims

1. A testing device for a vehicle's high-voltage system, characterized in that, The device includes: a system connection module, a bidirectional adjustable high-voltage channel, a ripple self-learning module, and a ripple injection and testing module; The system connection module is used to connect the test bench control system and the vehicle control system, and to collect test bench control parameters and vehicle control parameters. The bidirectional adjustable high-voltage channel is used to connect the high-voltage components of the vehicle. The channel state of the bidirectional adjustable high-voltage channel is adjusted according to the high-voltage components to be tested, and ripple injection and ripple acquisition are performed on the high-voltage components to obtain the ripple acquisition data of the high-voltage components. The ripple self-learning module is used to determine the predicted resonance point of the high-voltage component based on the test bench control parameters, the vehicle control parameters, and the ripple acquisition data. The injection and testing module is used to generate a test waveform based on the ripple acquisition data and the predicted resonance point, and inject the test waveform into the high-voltage component through the bidirectional adjustable high-voltage channel to perform a test of the vehicle's high-voltage system.

2. The apparatus according to claim 1, characterized in that, The bidirectional adjustable high-voltage channel includes at least two high-voltage channels; the channel states include: ripple injection state and ripple acquisition state. The ripple injection state characterization is to inject a preset impedance analysis waveform, or the test waveform, into the corresponding high-voltage component, and to obtain the ripple acquisition data of the high-voltage component after ripple injection. The ripple acquisition status is used to acquire ripple acquisition data of high-voltage components that have not undergone ripple injection; The vehicle high-voltage system includes at least two high-voltage components; when ripple injection is performed on one of the high-voltage components, the high-voltage channel connected to the high-voltage component performing the ripple injection is set to the ripple injection state, and the other high-voltage channels are set to the ripple acquisition state.

3. The apparatus according to claim 1, characterized in that, The ripple acquisition data includes: first ripple acquisition data and second ripple acquisition data; the first ripple acquisition data represents the operating data of each high-voltage component without injecting ripple into the preset impedance analysis waveform and test waveform; the second ripple acquisition data represents the data acquired when the preset impedance analysis waveform is injected into the high-voltage component for impedance characteristic analysis.

4. The apparatus according to claim 3, characterized in that, The ripple self-learning module is used to determine the test conditions based on the bench control parameters and the vehicle control parameters; and to collect first ripple acquisition data under different test conditions through the bidirectional adjustable high-voltage channel. The ripple self-learning module is also used to inject a preset impedance analysis waveform into different high-voltage components under different test conditions to obtain the second ripple acquisition data of the high-voltage components. The impedance characteristics of the vehicle's high-voltage system are determined based on the second ripple acquisition data; the predicted resonance point of the high-voltage component is determined based on the impedance characteristics, the first ripple acquisition data, and the vehicle control parameters.

5. The apparatus according to claim 3, characterized in that, The injection and testing module is used to determine the target ripple segment based on the first ripple acquisition data and the predicted resonant point, and to generate the test waveform based on the target ripple segment.

6. The apparatus according to claim 3, characterized in that, The ripple acquisition data also includes third ripple acquisition data; the injection and testing module is used to inject the test waveform into the high-voltage component to be tested; and to acquire the third ripple acquisition data of each high-voltage component; If the third ripple acquisition data is less than or equal to a preset test threshold, adjust the amplitude or frequency of the test waveform until the vehicle control parameters show a preset fault parameter; determine the failure threshold of the vehicle high-voltage system based on the test waveform injected when the preset fault parameter appears.

7. A test method for a vehicle's high-voltage system, characterized in that, The method is applied to the vehicle high-voltage system testing apparatus as described in any one of claims 1-6; the method includes: Obtain bench control parameters and vehicle control parameters; According to the bidirectional adjustable high-voltage channel, ripple injection and ripple acquisition are performed on the high-voltage components of the vehicle high-voltage system to obtain the ripple acquisition data of the high-voltage components. The predicted resonance point under different test conditions is determined based on the bench control parameters, the vehicle control parameters, and the ripple acquisition data. A test waveform is generated based on the ripple acquisition data and the predicted resonance point; The test waveform is injected into the high-voltage component through the bidirectional adjustable high-voltage channel, and the vehicle high-voltage system is tested based on the test waveform to determine the failure threshold of the vehicle high-voltage system.

8. The method according to claim 7, characterized in that, The step of injecting the test waveform into the high-voltage component through the bidirectional adjustable high-voltage channel, testing the vehicle high-voltage system based on the test waveform, and determining the failure threshold of the vehicle high-voltage system includes: Inject the test waveform into the high-voltage component that needs to be tested; The bidirectional adjustable high-voltage channel is used to acquire ripple data of each high-voltage component after the test waveform is injected. If the ripple acquisition data is less than or equal to a preset test threshold, adjust the amplitude or frequency of the test waveform until the vehicle control parameters show a preset fault parameter. The failure threshold is determined based on the test waveform corresponding to the preset fault parameters.

9. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored on the memory, wherein the processor executes the computer program to implement the method of any one of claims 7-8.

10. A computer-readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium, which, when executed by a processor, implements the method as described in any one of claims 7-8.

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