Ripple anti-interference test method, device and equipment for vehicle electric driving system

Abstract

The invention discloses a ripple wave anti-interference testing method, device and equipment of a vehicle electric driving system, and relates to the technical field of intelligent vehicles, and the method comprises the steps: controlling the vehicle to test the whole vehicle high-voltage inner reticulate wave in the operation process of the vehicle under various different real vehicle working conditions, and obtaining the high-voltage inner reticulate wave of the vehicle; obtaining whole vehicle ripple data corresponding to each real vehicle working condition; performing an initial test on the electric driving system of the vehicle to obtain a reference performance parameter of the electric driving system without ripple interference; inputting a simulation ripple signal to the electric driving system based on the whole vehicle ripple data so as to carry out an anti-interference test on the electric driving system to obtain an actual performance parameter of the electric driving system under ripple interference; and comparing the reference performance parameter with the actual performance parameter to obtain a ripple test evaluation result of the vehicle.

Description

Technical Field

[0001] The present application relates to the field of intelligent vehicle technology, and in particular to a ripple immunity testing method, device and equipment for a vehicle electric drive system. Background Art

[0002] The high-voltage internal network structure of new energy electric vehicles is complex. Under different actual vehicle working conditions, due to rapid load changes, PWM chopping, parasitic capacitance and inductance in the electrical circuit, etc., harmonics of different frequencies are generated on the high-voltage DC input side and coupled with each other on the high-voltage internal network of the vehicle, which has a negative impact on the driving safety of electric vehicles. For example, the measurement accuracy of the BMS sensor is over-adjusted, causing SOC estimation deviation and occasional power interruption; the power module and capacitor continue to heat up, reducing the life of the device, or even overheating and burning; the high-voltage three-electric system resonates, causing excessive instantaneous current, local overheating, and even fire.

[0003] In the early stage of product development, when designing system-level components through ripple simulation and other methods, it is difficult to accurately establish a vehicle ripple voltage model due to the complex structure of the vehicle system, the inability to determine parasitic capacitance and inductance, too many variable parameters, and the difficulty of analysis. This test standard only tests components, and the test waveform is single, which is quite different from the actual vehicle driving waveform and has limitations.

[0004] During the actual driving of electric vehicles, as the driving conditions continue to change, the ripple spectrum of the high-voltage internal network of the whole vehicle is also constantly changing. The existing test standards deviate from the actual high-voltage internal network ripple of the whole vehicle. Summary of the invention

[0005] The purpose of this application is to provide a ripple immunity test method, device and equipment for a vehicle electric drive system.

[0006] To achieve the above objectives, this application provides the following solutions: In a first aspect, the present application provides a ripple immunity test method for a vehicle electric drive system, comprising: Controlling the vehicle to operate under a plurality of different actual vehicle operating conditions, testing the whole vehicle high-voltage internal network ripple of the vehicle, and obtaining the whole vehicle ripple data corresponding to each of the actual vehicle operating conditions; Performing an initial test on the electric drive system of the vehicle to obtain a baseline performance parameter of the electric drive system without ripple interference; Inputting a simulated ripple signal to the electric drive system based on the vehicle ripple data to perform an anti-interference test on the electric drive system to obtain actual performance parameters of the electric drive system under ripple interference; The benchmark performance parameters are compared with the actual performance parameters to obtain a ripple test evaluation result of the vehicle.

[0007] Optionally, the step of performing an initial test on the electric drive system of the vehicle to obtain a baseline performance parameter of the electric drive system without ripple interference includes: Combine multiple different battery states, environmental loads, electric scenarios, and feeding scenarios to obtain an electric drive system ripple injection test matrix corresponding to multiple electric drive system test conditions; Based on the electric drive system ripple injection test matrix, the electric drive system is controlled to perform an initial test without ripple signal injection to obtain benchmark performance parameters.

[0008] Optionally, the step of inputting a simulated ripple signal to the electric drive system based on the vehicle ripple data to perform an anti-disturbance test on the electric drive system to obtain actual performance parameters of the electric drive system under ripple interference includes: Perform Fourier transform on the vehicle ripple data of the time domain data type under each actual vehicle working condition to obtain the vehicle high-voltage internal network spectrum corresponding to each actual vehicle working condition; Fitting an envelope curve to the vehicle high-voltage internal network spectrum as a ripple injection test parameter; During the testing of the electric drive system based on the electric drive system ripple injection test matrix, a simulated ripple signal is injected into the electric drive system based on the ripple injection test parameters to obtain actual performance parameters of the electric drive system under ripple interference.

[0009] Optionally, the step of controlling the vehicle to operate under a plurality of different actual vehicle operating conditions comprises: Obtaining vehicle parameters of the vehicle; Configure test parameters based on a variety of different real vehicle conditions; Debugging the test bench based on the vehicle parameters; The test bench is controlled according to the test parameters to simulate a plurality of different actual vehicle operating conditions for the vehicle, so that the vehicle operates under the plurality of different actual vehicle operating conditions.

[0010] Optionally, the step of setting test parameters based on a plurality of different actual vehicle operating conditions includes: Based on the high-voltage ripple scenario and the actual working scenario, the test parameters of the preset working conditions are adjusted to obtain the experimental parameters of a variety of different real vehicle working conditions.

[0011] Optionally, the step of comparing the benchmark performance parameter with the actual performance parameter to obtain the ripple test evaluation result of the vehicle includes: A ratio of the actual performance parameter to the reference performance parameter is calculated as a ripple test evaluation result of the vehicle.

[0012] In a second aspect, the present application provides a ripple immunity test device for a vehicle electric drive system, comprising: The ripple acquisition module is used to control the vehicle to run under a variety of different actual vehicle working conditions, test the vehicle's whole vehicle high-voltage internal network ripple, and obtain the whole vehicle ripple data corresponding to each actual vehicle working condition; A test module, used to perform an initial test on the electric drive system of the vehicle to obtain a baseline performance parameter of the electric drive system without ripple interference; Inputting a simulated ripple signal to the electric drive system based on the vehicle ripple data to perform an anti-interference test on the electric drive system to obtain actual performance parameters of the electric drive system under ripple interference; An evaluation module is used to compare the benchmark performance parameters with the actual performance parameters to obtain a ripple test evaluation result of the vehicle.

[0013] Optionally, the test module is further used to: Combine multiple different battery states, environmental loads, electric scenarios, and feeding scenarios to obtain an electric drive system ripple injection test matrix corresponding to multiple electric drive system test conditions; Based on the electric drive system ripple injection test matrix, the electric drive system is controlled to perform an initial test without ripple signal injection to obtain benchmark performance parameters.

[0014] Optionally, the test module is further used to: Perform Fourier transform on the vehicle ripple data of the time domain data type under each actual vehicle working condition to obtain the vehicle high-voltage internal network spectrum corresponding to each actual vehicle working condition; Fitting an envelope curve to the vehicle high-voltage internal network spectrum as a ripple injection test parameter; During the testing of the electric drive system based on the electric drive system ripple injection test matrix, a simulated ripple signal is injected into the electric drive system based on the ripple injection test parameters to obtain actual performance parameters of the electric drive system under ripple interference.

[0015] Optionally, the acquisition module is further used to: Obtaining vehicle parameters of the vehicle; Configure test parameters based on a variety of different real vehicle conditions; Debugging the test bench based on the vehicle parameters; The test bench is controlled according to the test parameters to simulate a plurality of different actual vehicle operating conditions for the vehicle, so that the vehicle operates under the plurality of different actual vehicle operating conditions.

[0016] Optionally, the acquisition module is further used to: Based on the high-voltage ripple scenario and the actual working scenario, the test parameters of the preset working conditions are adjusted to obtain the experimental parameters of a variety of different real vehicle working conditions.

[0017] Optionally, the evaluation module is further used to: A ratio of the actual performance parameter to the reference performance parameter is calculated as a ripple test evaluation result of the vehicle.

[0018] In a third aspect, the present application provides a computer device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the ripple immunity test method for a vehicle electric drive system described in any one of the above.

[0019] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the ripple immunity test method for a vehicle electric drive system as described in any one of the above.

[0020] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of the ripple immunity test method for a vehicle electric drive system described in any one of the above.

[0021] According to the specific embodiments provided in this application, this application discloses the following technical effects: The present application provides a ripple immunity test method, device and equipment for a vehicle electric drive system. By utilizing the whole vehicle ripple data collected under various real-time vehicle conditions, during the process of testing the vehicle's electric drive system, a ripple signal having the whole vehicle ripple characteristics under real-time vehicle conditions is injected into the electric drive system based on the whole vehicle ripple data to collect actual performance parameters, and the ripple test evaluation results are compared with the basic performance parameters of the electric drive system collected when no ripple signal is injected to determine the ripple test evaluation results, so that the ripple test evaluation results can reflect the impact of the real-time vehicle condition on the whole vehicle ripple, thereby improving the accuracy of the ripple test of the vehicle electric drive system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic flow chart of a ripple immunity test method for a vehicle electric drive system provided in one embodiment of the present application; Figure 2A schematic diagram of a vehicle testing system according to an embodiment of the present application; Figure 3 A schematic diagram of functional modules of a ripple immunity test device for a vehicle electric drive system provided in one embodiment of the present application; Figure 4 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] like Figure 1 As shown, some embodiments of the present application provide a ripple immunity test method for a vehicle electric drive system, which includes the following steps 101 to 104. Among them: Step 101, controlling the vehicle to operate under a plurality of different actual vehicle operating conditions, and testing the whole vehicle high-voltage internal network ripple of the vehicle to obtain the whole vehicle ripple data corresponding to each of the actual vehicle operating conditions.

[0026] In the embodiment of the present application, it is necessary to determine a variety of actual vehicle operating conditions to be tested, and these actual vehicle operating conditions can refer to standard driving cycles, such as NEDC (New European Driving Cycle), WLTC (World Light Vehicle Test Cycle), CLTC (China Light-duty Vehicle Test Cycle), etc. In addition, specific test conditions can be formulated according to actual needs and in combination with the actual road working conditions of the electric drive system of the electric vehicle. Before testing, it is necessary to install corresponding sensors on the high-voltage internal network of the test vehicle, such as differential voltage probes and current clamps, to collect voltage and current signals. These sensors are usually installed on the high-voltage input side of the electric drive system and the output side of the power battery to capture the ripple waveform of the high-voltage internal network. Then, according to the test requirements, the data type contained in the data of the whole vehicle ripple data, such as sampling rate, filter type, filter order, cut-off frequency, etc., can be set according to actual needs, and are not limited here.

[0027] Finally, the vehicle is controlled to run under various selected real vehicle working conditions, and the data acquisition system synchronously records the ripple data of the high-voltage internal network. After each real vehicle working condition is completed, a set of corresponding vehicle ripple data will be obtained.

[0028] Step 102 : performing an initial test on the electric drive system of the vehicle to obtain a baseline performance parameter of the electric drive system without ripple interference.

[0029] In an embodiment of the present application, a test vehicle is installed on a test bench to simulate the actual road operation environment. Ensure that the electric drive system is in normal working condition and connect the corresponding data acquisition equipment. According to the test requirements, configure the parameters of the test bench, such as wheel end speed, load, etc., to simulate different working scenarios. Without injecting a ripple signal, start the electric drive system and record its benchmark performance parameters under various actual vehicle conditions, such as current, voltage, speed, torque, output power, temperature, etc., which can be set according to actual needs and are not limited here.

[0030] Step 103: inputting a simulated ripple signal into the electric drive system based on the vehicle ripple data to perform an anti-disturbance test on the electric drive system to obtain actual performance parameters of the electric drive system under ripple interference.

[0031] In an embodiment of the present application, an FFT (Fast Fourier Transform) analysis is performed based on the vehicle ripple data to obtain a spectrum diagram, and a test case for the simulated ripple signal is formulated based on the spectrum diagram. These test cases include parameters such as the frequency, amplitude, and waveform of the simulated signal. On the test bench, a simulated ripple signal is injected into the electric drive system through a signal generator or other device to simulate the ripple interference in actual road operation. When the simulated ripple signal is injected, the electric drive system is started and its performance parameters under various operating conditions are recorded. These parameters will be compared with the baseline performance parameters in the initial test to evaluate the actual performance of the electric drive system under ripple interference.

[0032] Step 104 , comparing the benchmark performance parameter with the actual performance parameter to obtain a ripple test evaluation result of the vehicle.

[0033] In an embodiment of the present application, the benchmark performance parameters obtained in the initial test are compared with the actual performance parameters obtained in the anti-interference test to evaluate the robustness of the electric drive system under ripple interference. The specific steps include: comparing the actual performance parameters with the benchmark performance parameters one by one, and calculating the deviation or percentage change between the two. Based on the comparison results, the performance of the electric drive system under ripple interference is evaluated. Focus on those parameters with large deviations and analyze their impact on the overall performance of the electric drive system. The comparison results and performance evaluation are organized into an evaluation report, summarizing the performance of the electric drive system under ripple interference, and proposing corresponding improvement measures or suggestions.

[0034] The embodiments of the present application utilize the vehicle ripple data collected under various real-time vehicle conditions. During the process of testing the vehicle's electric drive system, a ripple signal having the vehicle ripple characteristics under real-time vehicle conditions is injected into the electric drive system based on the vehicle ripple data to collect actual performance parameters, and the ripple test evaluation results are compared with the basic performance parameters of the electric drive system collected when no ripple signal is injected to determine the ripple test evaluation results, so that the ripple test evaluation results can reflect the impact of the real-time vehicle condition on the vehicle ripple, thereby improving the accuracy of the ripple test of the vehicle's electric drive system.

[0035] Optionally, the step 102 includes: Step 1021 , combining a plurality of different battery states, environmental loads, electric driving scenarios, and feeding scenarios to obtain an electric drive system ripple injection test matrix corresponding to a plurality of electric drive system test conditions.

[0036] Step 1022: Based on the electric drive system ripple injection test matrix, the electric drive system is controlled to perform an initial test without ripple signal injection to obtain benchmark performance parameters.

[0037] In the present application example, in order to more realistically simulate various situations of electric vehicles in actual use, multiple different factors can be combined, including: Battery status: The battery’s state of charge (SOC) directly affects the performance of the electric drive system, so different SOC ranges need to be considered in the test, such as 10%~30%, 30%~60%, 60%~90%, etc.

[0038] Environmental load: Different ambient temperatures also have a significant impact on the heat dissipation and performance of the electric drive system. The ambient temperatures usually considered include low temperature (-20°C), normal temperature (23°C) and high temperature (45°C).

[0039] Electric scenarios and feeding scenarios: Electric scenarios refer to scenarios where the battery supplies power to the electric drive system, while feeding scenarios may involve situations such as reverse power flow such as energy recovery.

[0040] By combining the above factors in different combinations, a comprehensive test matrix can be obtained. This matrix contains multiple test conditions, each of which corresponds to a specific battery state, ambient temperature, and electric / feeding scenario. For example, a row in a test matrix may represent a combination of SOC 30%~60%, normal temperature 23℃, and electric scenario.

[0041] Before the formal ripple injection test, the electric drive system needs to be initially tested without ripple signal injection to obtain the system's baseline performance parameters. These baseline parameters include current, voltage, speed, torque, output power, mechanical power, and sample temperature, which will serve as the basis for subsequent evaluation of system performance changes. The electric drive system to be tested is installed on the test bench and debugged according to the first operating point in the test matrix to ensure that all test equipment is ready. Start the test system, control the electric drive system to operate according to the current operating conditions, and use high-precision data acquisition equipment to record the system's various performance parameters. The collected performance parameters are sorted and saved as the baseline performance parameters under this condition.

[0042] Furthermore, by changing the operating points in the test matrix one by one and repeating the above initial test steps, the benchmark performance parameters under various operating conditions can be obtained. These parameters will provide an important reference for the subsequent ripple injection test. In the ripple injection test, a simulated high-voltage ripple signal will be injected into the electric drive system through a ripple generator, and the performance parameters of the system will be recorded again. By comparing and analyzing the performance parameters after ripple injection with the benchmark performance parameters, the anti-interference ability of the electric drive system to high-voltage ripple under different operating conditions can be evaluated, thereby fully verifying its performance and robustness.

[0043] The embodiment of the present application combines multiple different battery states, environmental loads, electric scenarios and feeding scenarios to obtain an electric drive system ripple injection test matrix corresponding to multiple electric drive system test conditions, and performs an initial test without ripple signal injection based on the test matrix, thereby improving the robustness of evaluating the high-voltage ripple of the electric drive system.

[0044] Optionally, the step 103 includes: Step 1031, performing Fourier transform on the whole vehicle ripple data of the time domain data type under each actual vehicle working condition, to obtain the whole vehicle high voltage internal network spectrum diagram corresponding to each actual vehicle working condition.

[0045] Step 1032, fitting an envelope curve to the vehicle high-voltage internal network spectrum diagram as a ripple injection test parameter.

[0046] Step 1033, during the test of the electric drive system based on the electric drive system ripple injection test matrix, a simulated ripple signal is injected into the electric drive system based on the ripple injection test parameters to obtain actual performance parameters of the electric drive system under ripple interference.

[0047] In the embodiment of the present application, Fourier transform is a mathematical method for converting signals from the time domain to the frequency domain. The vehicle ripple data in the time domain contains the fluctuation information of various frequency components. The time domain data can be converted to the frequency domain by performing a fast Fourier transform (FFT) according to the following formula (1), thereby clearly showing the ripple amplitude at different frequencies: (1) After obtaining the frequency domain data under various actual vehicle working conditions, the spectrum of the high-voltage internal network of the whole vehicle can be drawn. These spectrum diagrams of the high-voltage internal network of the whole vehicle can intuitively reflect the frequency distribution and amplitude of the voltage fluctuation in the high-voltage internal network under different working conditions. The amplitude corresponding to each frequency point in the spectrum diagram of the high-voltage internal network of the whole vehicle may not be completely smooth, but show a certain fluctuation. In order to simplify the test process and better simulate the ripple characteristics under the actual vehicle working conditions, the spectrum diagram of the high-voltage internal network of the whole vehicle is usually fitted to generate a smooth envelope. This envelope can generally represent the main characteristics of the spectrum diagram of the high-voltage internal network of the whole vehicle, including the main fluctuation frequency and the corresponding amplitude range. Specifically, each point on the envelope corresponds to a specific frequency and corresponding amplitude value, which will be used to set the parameters of the ripple generator in order to simulate the ripple characteristics under the actual vehicle working conditions in a laboratory environment.

[0048] Specifically, in the process of testing the electric drive system based on the test matrix, the ripple injection test parameters obtained by fitting are used to inject simulated ripple signals into the electric drive system using a ripple generator. These signals will simulate the voltage fluctuations in the high-voltage internal network under the actual vehicle working conditions, thereby testing the performance of the electric drive system. While injecting the simulated ripple signal, various performance parameters of the electric drive system are monitored and recorded in real time using high-precision test equipment. These parameters may include current, voltage, speed, torque, output power, mechanical power, and sample temperature. They will directly reflect the actual working state and performance of the electric drive system under ripple interference. By analyzing and comparing the changes in the performance parameters of the electric drive system before and after the injection of the simulated ripple signal, the anti-interference ability of the electric drive system to high-voltage ripple under different working conditions can be evaluated. If the system performance parameters change significantly after the ripple injection, such as a decrease in output power and an increase in torque fluctuation, it means that the robustness of the electric drive system to high-voltage ripple under this working condition is poor, and further optimization design is needed to improve its anti-interference ability.

[0049] Optionally, the step 101 includes: Step 1011, obtaining vehicle parameters of the vehicle.

[0050] Step 1012, configuring test parameters based on a variety of different actual vehicle operating conditions.

[0051] Step 1013: debug the test bench based on the vehicle parameters.

[0052] Step 1014: Control the test bench to simulate a plurality of different actual vehicle operating conditions for the vehicle according to the test parameters, so that the vehicle operates under a plurality of different actual vehicle operating conditions.

[0053] In the embodiments of the present application, before testing, it is necessary to first clarify the specific parameters of the vehicle under test, including but not limited to: vehicle curb weight: the weight of the vehicle when unloaded; vehicle wheelbase: the distance between the centers of the front and rear axles; fully loaded mass: the weight of the vehicle when fully loaded; drive mode: front-wheel drive, rear-wheel drive or four-wheel drive, etc.; vehicle high-voltage internal network electrical architecture: describes the layout and connection method of the high-voltage electrical system inside the vehicle; sliding resistance curve: describes the resistance of the vehicle when sliding at different speeds, usually obtained through sliding tests. These parameters are used to ensure that the test bench can accurately simulate the operating conditions of the vehicle on the actual road.

[0054] Exemplarily, the vehicle parameters of the vehicle may be as shown in Table 1: Table 1

[0055] Of course, Table 1 is only an exemplary description and can be set according to actual needs, which is not limited here.

[0056] The setting of test parameters needs to take into account various real vehicle operating conditions that may be encountered during actual road driving to ensure the comprehensiveness and accuracy of the test. These operating conditions can refer to international or domestic test standards, such as NEDC, WLTC, CLTC, etc., and be customized in combination with the actual working scenarios of electric vehicle electric drive systems on the road.

[0057] Test parameters include but are not limited to: operating condition selection: such as constant speed driving, sudden acceleration, overtaking, emergency braking, coasting, etc.; SOC (state of charge) range: different battery power levels have a significant impact on vehicle performance, so different SOC ranges need to be set for testing; ambient temperature: the performance of the vehicle will be different under different temperature conditions, so multiple temperature points need to be set for testing; switching on and off of high-voltage systems (such as air-conditioning compressor, PTC, etc.).

[0058] Reference Figure 2, the test bench is debugged according to the parameters of the vehicle under test to ensure that the test bench can accurately simulate the driving state of the vehicle on the actual road. First, it is necessary to install differential voltage probes and current clamps on the high-voltage input side of the electric drive system and the output side of the power battery to monitor voltage and current fluctuations. Then set appropriate sampling rate, filter type, filter order and other parameters to ensure the accuracy and completeness of data acquisition. Adjust the bench settings according to the sliding resistance curve, curb weight and other parameters of the vehicle under test to simulate the actual driving conditions of the vehicle. After the test bench is debugged, the test bench is controlled to simulate a variety of different real vehicle working conditions according to the pre-set test parameters.

[0059] For example, the parameters of the actual vehicle working condition can be as shown in Table 2: Table 2

[0060] Of course, Table 2 is only an exemplary description and can be set according to actual needs, which is not limited here.

[0061] Exemplarily, the acquisition parameters may be as shown in Table 3 below: Table 3

[0062] Of course, Table 3 is only an exemplary description and can be set according to actual needs, which is not limited here.

[0063] The control test bench simulates a variety of different real vehicle working conditions. The process is to simulate different output power and battery SOC levels according to the working condition settings. Adjust the temperature of the test environment to simulate different climate conditions. Control the switching on and off of high-voltage systems such as air-conditioning compressors and PTCs to observe the ripple of the high-voltage internal network under different conditions. Record and analyze key parameters such as voltage and current of the vehicle under simulated working conditions to evaluate the ripple robustness and performance stability of the electric drive system.

[0064] Optionally, the step 1012 includes: adjusting the test parameters of the preset working conditions based on the high-voltage ripple scenario and the actual working scenario to obtain experimental parameters of a variety of different actual vehicle working conditions.

[0065] In an embodiment of the present application, high-voltage ripple data of electric vehicles under different working conditions are collected on actual roads or test benches. Through data analysis, key parameters such as the main frequency range and amplitude variation characteristics of the ripple are determined. These parameters will serve as the basis for subsequent tests. The collected high-voltage ripple data is associated with specific working conditions to identify the changing pattern of the ripple under different working conditions. For example, under rapid acceleration conditions, the ripple amplitude may increase significantly; while when driving at a constant speed, the ripple amplitude is relatively stable. According to the results of the correlation analysis between the high-voltage ripple data and the working conditions, the preset test condition parameters are adjusted. This may include adjusting the type of test conditions (such as adding rapid acceleration, overtaking and other working conditions), changing the duration of the working conditions, adjusting the SOC range, changing the ambient temperature setting, etc., to ensure that the test can fully cover various possible high-voltage ripple scenarios.

[0066] Analyze the typical working scenarios of electric vehicles in actual use, such as driving on urban roads, driving on highways, driving under extreme weather conditions (such as high temperature, low temperature), etc. Understand the changes in electrical and environmental loads that the vehicle may encounter in these scenarios. According to the analysis results of the actual working scenarios, adjust the parameter settings of the test bench to simulate these actual conditions. For example, when testing in a high temperature environment, it is necessary to adjust the ambient temperature control system of the test bench; when simulating mountain climbing conditions, it is necessary to adjust the slope and resistance settings of the test bench. During the test process, comprehensively consider the interactive effects of electrical loads and environmental loads. For example, when performing full-power output tests in a high temperature environment, it is necessary to consider not only the impact of electrical loads on the electric drive system, but also the possible impact of high temperature on the performance of electrical components.

[0067] Through the above methods, a variety of different actual vehicle operating condition experimental parameters are obtained to guide subsequent testing work and ensure that the test can fully and truly reflect the high-voltage ripple conditions and electric drive system performance of electric vehicles in actual use. These experimental parameters will cover various possible operating condition combinations and electrical and environmental load conditions, providing strong data support for the optimal design of the electric drive system.

[0068] Optionally, the step 104 includes: calculating a ratio of the actual performance parameter to the benchmark performance parameter as a ripple test evaluation result of the vehicle.

[0069] In an embodiment of the present application, by comparing the performance parameters of the electric drive system before and after the ripple is injected, the system's anti-interference ability to high-voltage ripple and its stability can be evaluated. Specifically, from the benchmark performance parameters and the actual performance parameters, key parameters that have a significant impact on the performance of the electric drive system are selected for comparison, such as efficiency, torque accuracy, etc. The actual performance parameters are compared with the benchmark performance parameters one by one, and their ratio is calculated. This ratio reflects the degree of performance change of the electric drive system under ripple interference. According to the calculated ratio, the high-voltage ripple anti-interference ability of the electric drive system is evaluated. If the ratio is close to 1, it means that the system performance is less affected by the ripple interference; if the ratio deviates greatly from 1, it means that the system performance is significantly affected and further analysis and optimization are required.

[0070] By calculating the ratio of actual performance parameters to benchmark performance parameters as the evaluation result, the performance change of the electric drive system under high-voltage ripple interference can be intuitively reflected, which has important guiding significance for the design and optimization of the system and improves the system's anti-interference ability.

[0071] Based on the same inventive concept, the embodiment of the present application also provides a ripple immunity test device for a vehicle electric drive system for implementing the ripple immunity test method for the vehicle electric drive system involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in the embodiments of the ripple immunity test device for the vehicle electric drive system provided below can refer to the limitations of the ripple immunity test method for the vehicle electric drive system above, and will not be repeated here.

[0072] In an exemplary embodiment, Figure 3 As shown, a ripple immunity test device 30 for a vehicle electric drive system is provided, comprising: The ripple collection module 201 is used to control the vehicle to run under a variety of different actual vehicle working conditions, test the vehicle's whole vehicle high-voltage internal network ripple, and obtain the whole vehicle ripple data corresponding to each actual vehicle working condition; A test module 202 is used to perform an initial test on the electric drive system of the vehicle to obtain a baseline performance parameter of the electric drive system without ripple interference; Inputting a simulated ripple signal to the electric drive system based on the vehicle ripple data to perform an anti-interference test on the electric drive system to obtain actual performance parameters of the electric drive system under ripple interference; The evaluation module 203 is used to compare the benchmark performance parameters with the actual performance parameters to obtain the ripple test evaluation result of the vehicle.

[0073] Optionally, the testing module 202 is further configured to: Combine multiple different battery states, environmental loads, electric scenarios, and feeding scenarios to obtain an electric drive system ripple injection test matrix corresponding to multiple electric drive system test conditions; Based on the electric drive system ripple injection test matrix, the electric drive system is controlled to perform an initial test without ripple signal injection to obtain benchmark performance parameters.

[0074] Optionally, the testing module 202 is further configured to: Perform Fourier transform on the vehicle ripple data of the time domain data type under each actual vehicle working condition to obtain the vehicle high-voltage internal network spectrum corresponding to each actual vehicle working condition; Fitting an envelope curve to the vehicle high-voltage internal network spectrum as a ripple injection test parameter; During the testing of the electric drive system based on the electric drive system ripple injection test matrix, a simulated ripple signal is injected into the electric drive system based on the ripple injection test parameters to obtain actual performance parameters of the electric drive system under ripple interference.

[0075] Optionally, the acquisition module is further used to: Obtaining vehicle parameters of the vehicle; Configure test parameters based on a variety of different real vehicle conditions; Debugging the test bench based on the vehicle parameters; The test bench is controlled according to the test parameters to simulate a plurality of different actual vehicle operating conditions for the vehicle, so that the vehicle operates under the plurality of different actual vehicle operating conditions.

[0076] Optionally, the ripple collection module 201 is further used for: Based on the high-voltage ripple scenario and the actual working scenario, the test parameters of the preset working conditions are adjusted to obtain the experimental parameters of a variety of different real vehicle working conditions.

[0077] Optionally, the evaluation module 203 is further configured to: A ratio of the actual performance parameter to the reference performance parameter is calculated as a ripple test evaluation result of the vehicle.

[0078] The embodiments of the present application utilize the vehicle ripple data collected under various real-time vehicle conditions. During the process of testing the vehicle's electric drive system, a ripple signal having the vehicle ripple characteristics under real-time vehicle conditions is injected into the electric drive system based on the vehicle ripple data to collect actual performance parameters, and the ripple test evaluation results are compared with the basic performance parameters of the electric drive system collected when no ripple signal is injected to determine the ripple test evaluation results, so that the ripple test evaluation results can reflect the impact of the real-time vehicle condition on the vehicle ripple, thereby improving the accuracy of the ripple test of the vehicle's electric drive system.

[0079] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 4 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store vehicle test data. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a ripple immunity test method for a vehicle electric drive system is implemented.

[0080] Those skilled in the art will understand that Figure 4 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0081] In an exemplary embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0082] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0083] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0084] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0085] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

[0086] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0087] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A ripple immunity test method for a vehicle electric drive system, characterized in that: The ripple immunity test method of the vehicle electric drive system includes: Controlling the vehicle to operate under a plurality of different actual vehicle operating conditions, testing the whole vehicle high-voltage internal network ripple of the vehicle, and obtaining the whole vehicle ripple data corresponding to each of the actual vehicle operating conditions; Performing an initial test on the electric drive system of the vehicle to obtain a baseline performance parameter of the electric drive system without ripple interference; Inputting a simulated ripple signal to the electric drive system based on the vehicle ripple data to perform an anti-interference test on the electric drive system to obtain actual performance parameters of the electric drive system under ripple interference; The benchmark performance parameters are compared with the actual performance parameters to obtain a ripple test evaluation result of the vehicle.

2. The ripple immunity test method of the vehicle electric drive system according to claim 1, characterized in that: The step of performing an initial test on the electric drive system of the vehicle to obtain a baseline performance parameter of the electric drive system without ripple interference comprises: Combine multiple different battery states, environmental loads, electric scenarios, and feeding scenarios to obtain an electric drive system ripple injection test matrix corresponding to multiple electric drive system test conditions; Based on the electric drive system ripple injection test matrix, the electric drive system is controlled to perform an initial test without ripple signal injection to obtain benchmark performance parameters.

3. The ripple immunity test method of the vehicle electric drive system according to claim 2, characterized in that: The step of inputting a simulated ripple signal to the electric drive system based on the vehicle ripple data to perform an anti-disturbance test on the electric drive system to obtain actual performance parameters of the electric drive system under ripple interference includes: Perform Fourier transform on the vehicle ripple data of the time domain data type under each actual vehicle working condition to obtain the vehicle high-voltage internal network spectrum corresponding to each actual vehicle working condition; Fitting an envelope curve to the vehicle high-voltage internal network spectrum as a ripple injection test parameter; During the testing of the electric drive system based on the electric drive system ripple injection test matrix, a simulated ripple signal is injected into the electric drive system based on the ripple injection test parameters to obtain actual performance parameters of the electric drive system under ripple interference.

4. The ripple immunity test method of a vehicle electric drive system according to claim 1, characterized in that: The steps of controlling the vehicle to operate under a plurality of different actual vehicle operating conditions include: Obtaining vehicle parameters of the vehicle; Configure test parameters based on a variety of different real vehicle conditions; Debugging the test bench based on the vehicle parameters; The test bench is controlled according to the test parameters to simulate a plurality of different actual vehicle operating conditions for the vehicle, so that the vehicle operates under the plurality of different actual vehicle operating conditions.

5. The ripple immunity test method of the vehicle electric drive system according to claim 4, characterized in that: The step of setting test parameters based on a variety of different actual vehicle working conditions includes: Based on the high-voltage ripple scenario and the actual working scenario, the test parameters of the preset working conditions are adjusted to obtain the experimental parameters of a variety of different real vehicle working conditions.

6. The ripple immunity test method of a vehicle electric drive system according to claim 1, characterized in that: The step of comparing the benchmark performance parameter with the actual performance parameter to obtain the ripple test evaluation result of the vehicle includes: A ratio of the actual performance parameter to the reference performance parameter is calculated as a ripple test evaluation result of the vehicle.

7. A ripple immunity test device for a vehicle electric drive system, characterized in that: The ripple immunity test device of the vehicle electric drive system comprises: The ripple acquisition module is used to control the vehicle to run under a variety of different actual vehicle working conditions, test the vehicle's whole vehicle high-voltage internal network ripple, and obtain the whole vehicle ripple data corresponding to each actual vehicle working condition; A test module, used to perform an initial test on the electric drive system of the vehicle to obtain a baseline performance parameter of the electric drive system without ripple interference; Inputting a simulated ripple signal to the electric drive system based on the vehicle ripple data to perform an anti-interference test on the electric drive system to obtain actual performance parameters of the electric drive system under ripple interference; An evaluation module is used to compare the benchmark performance parameters with the actual performance parameters to obtain a ripple test evaluation result of the vehicle.

8. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the ripple immunity test method for a vehicle electric drive system according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the ripple immunity test method for a vehicle electric drive system according to any one of claims 1 to 6 are implemented.

10. A computer program product, characterized in that The invention comprises a computer program, which, when executed by a processor, implements the steps of the ripple immunity test method for a vehicle electric drive system according to any one of claims 1 to 6.

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