Ripple power testing method, device and equipment for vehicle electric driving system

Abstract

The invention discloses a ripple power test method, device and equipment for a vehicle electric drive system, and relates to the technical field of vehicle tests.The method comprises the steps that in the process that a vehicle is controlled to run under various real vehicle working conditions, whole vehicle high-pressure inner reticulate waves of the vehicle are tested, and whole vehicle ripple data of the real vehicle working conditions are obtained; combining the battery state, the environmental load, the electric scene and the feed scene to obtain an electric drive system ripple injection test matrix of various electric drive system test conditions; controlling the electric driving system to test according to the ripple injection test matrix to obtain a basic power parameter of the electric driving system without ripple interference; in the process of controlling the electric driving system to operate according to the ripple injection test matrix, inputting a ripple signal to the electric driving system based on the whole vehicle ripple data to obtain an actual power parameter of the electric driving system; and analyzing the basic power parameters and the actual power parameters to obtain a power evaluation result and an efficiency test result of the vehicle.

Description

Technical Field

[0001] The present application relates to the field of vehicle testing technology, and in particular to a ripple power 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 power testing 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 power testing 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; Combine multiple different battery states, environmental loads, electric scenarios, and feeding scenarios to obtain a ripple injection test matrix for the electric drive system corresponding to multiple electric drive system test conditions; Controlling the electric drive system to perform an initial test according to the ripple injection test matrix to obtain basic power parameters of the electric drive system without ripple interference; In the process of controlling the electric drive system to operate according to the ripple injection test matrix, a ripple signal is input into the electric drive system based on the vehicle ripple data to obtain actual power parameters of the electric drive system; The basic power parameters and the actual power parameters are analyzed to obtain a power evaluation result and an efficiency test result of the vehicle.

[0007] Optionally, the power evaluation result is obtained by the following steps: The basic power parameters at least include: the basic torque of the electric drive system at different test operating points, and the actual power parameters at least include: the actual torque of the electric drive system at different test operating points; A power evaluation result is determined based on a maximum value of a deviation between the actual torque and the basic torque at different test operating points.

[0008] Optionally, the efficiency test result is obtained by the following steps: The basic power parameters at least include: the assembly output power data of the electric drive system, and the actual power parameters at least include: the power output data of the power supply end of the electric drive system under different test conditions; The efficiency test result is determined based on the ratio of the power output data of the power supply end to the power output data of the assembly under the different test conditions.

[0009] Optionally, in the process of controlling the electric drive system to operate according to the ripple injection test matrix, the step of inputting a ripple signal to the electric drive system based on the vehicle ripple data to obtain actual power parameters of the electric drive system 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 power parameters of the electric drive system under ripple interference.

[0010] 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.

[0011] 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.

[0012] In a second aspect, the present application provides a ripple power 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 processing module, used to combine multiple different battery states, environmental loads, electric scenarios and feeding scenarios to obtain a ripple injection test matrix of the electric drive system corresponding to multiple electric drive system test conditions; Controlling the electric drive system to perform an initial test according to the ripple injection test matrix to obtain basic power parameters of the electric drive system without ripple interference; In the process of controlling the electric drive system to operate according to the ripple injection test matrix, a ripple signal is input into the electric drive system based on the vehicle ripple data to obtain actual power parameters of the electric drive system; The evaluation module is used to analyze the basic power parameters and the actual power parameters to obtain a power evaluation result and an efficiency test result of the vehicle.

[0013] Optionally, the basic power parameter includes at least: a basic torque of the electric drive system at different test operating points, and the actual power parameter includes at least: an actual torque of the electric drive system at different test operating points; the processing module is further used to: A power evaluation result is determined based on a maximum value of a deviation between the actual torque and the basic torque at different test operating points.

[0014] Optionally, the basic power parameters at least include: the assembly output power data of the electric drive system, and the actual power parameters at least include: the power output data of the power supply end of the electric drive system under different test conditions; the processing module is further used to: The efficiency test result is determined based on the ratio of the power output data of the power supply end to the power output data of the assembly under the different test conditions.

[0015] Optionally, the processing 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 power parameters of the electric drive system under ripple interference.

[0016] Optionally, the ripple collection module is further used for: 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.

[0017] Optionally, the ripple collection module 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.

[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 dynamics testing method for a vehicle electric drive system as 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 dynamics testing 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 dynamic testing 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 power 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 power parameters, and the actual power parameters are compared with the basic power parameters of the electric drive system collected when no ripple signal is injected to determine the power evaluation results and efficiency test results, so that the power evaluation results and efficiency test 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's 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 power test method for a vehicle electric drive system provided in one embodiment of the present application; Figure 2 A 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 power 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 power 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 is configured, such as sampling rate, filter type, filter order, cut-off frequency, etc., which 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 , combining a plurality of different battery states, environmental loads, electric driving scenarios, and feeding scenarios to obtain a ripple injection test matrix of the electric drive system corresponding to a plurality of electric drive system test conditions.

[0029] In the embodiment of the present application, in order to comprehensively evaluate the performance of the electric drive system under different conditions, the researchers combined multiple different battery states (such as different ranges of SOC), environmental loads (such as different temperature conditions), electric scenarios and feeding scenarios. Through these combinations, a variety of electric drive system test conditions are formed, and the electric drive system ripple injection test matrix is ​​constructed accordingly. The ripple injection test matrix is ​​used to describe the specific test parameters under different test conditions (including battery status, ambient temperature, electric drive system load, etc.).

[0030] Step 103 : Controlling the electric drive system to perform an initial test according to the ripple injection test matrix to obtain basic power parameters of the electric drive system without ripple interference.

[0031] In an embodiment of the present application, before the formal test is performed according to the test matrix, the electric drive system must first be initially tested to obtain its basic power parameters without ripple interference. This process is usually carried out without injecting any ripple signal, by controlling the test bench to simulate the wheel end speed, and recording various power parameters of the electric drive system, including but not limited to current, voltage, speed, torque, power supply end output power, dynamometer end mechanical power and sample temperature. These parameters will serve as a benchmark for subsequent analysis.

[0032] Step 104 , in the process of controlling the electric drive system to operate according to the ripple injection test matrix, a ripple signal is input into the electric drive system based on the whole vehicle ripple data to obtain actual power parameters of the electric drive system.

[0033] In an embodiment of the present application, the basic power parameters are the power parameters exhibited by the electric drive system when it is running at different test operating points without injecting any ripple signals. These parameters reflect the basic performance of the electric drive system under an ideal interference-free state. Specifically, it at least includes the basic torque of the electric drive system at different test operating points, and may also include current, voltage, speed, output power at the power supply end, mechanical power at the dynamometer end, and sample temperature. The actual power parameters refer to the actual power parameters exhibited by the electric drive system when it is running at different test operating points after the ripple signal is injected. These parameters reflect the actual performance of the electric drive system when it is interfered by external ripples. Similarly, the actual power parameters also include at least the actual torque of the electric drive system at different test operating points, as well as other possible performance indicators.

[0034] After obtaining the basic power parameters, the researchers will input the corresponding ripple signal into the electric drive system based on the previously collected vehicle high-voltage internal network ripple data. This process is strictly carried out in accordance with the provisions of the test matrix to ensure the accuracy and repeatability of the test. While injecting the ripple signal, the actual power parameters of the electric drive system continue to be recorded for subsequent comparative analysis.

[0035] Step 105: Analyze the basic power parameters and the actual power parameters to obtain a power evaluation result and an efficiency test result of the vehicle.

[0036] In an embodiment of the present application, a comparative analysis is performed between the basic power parameters of the electric drive system without ripple interference and the actual power parameters after the ripple signal is injected, so as to evaluate the performance of the electric drive system under different working conditions, including test results of torque accuracy, efficiency and other aspects.

[0037] Specifically, the evaluation of torque accuracy is usually achieved by calculating the difference or deviation percentage between the actual torque and the target torque; while the evaluation of efficiency can be achieved by using the power comparison method or the cumulative energy method to calculate the operating efficiency based on the proportional relationship between the output power at the power supply end and the mechanical power.

[0038] 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 power parameters, and the actual power parameters are compared with the basic power parameters of the electric drive system collected when no ripple signal is injected to determine the power evaluation result and the efficiency test result, so that the power evaluation result and the efficiency test result 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.

[0039] Optionally, the basic power parameters include at least: the basic torque of the electric drive system at different test operating points, the actual power parameters include at least: the actual torque of the electric drive system at different test operating points, and the power evaluation result is obtained by the following steps: determining the power evaluation result based on the maximum value of the deviation between the actual torque and the basic torque at different test operating points.

[0040] In the embodiment of the present application, in order to evaluate the performance change of the electric drive system under ripple interference, it is necessary to obtain a power evaluation result by comparing and analyzing the basic power parameters and the actual power parameters.

[0041] Specifically, the basic torque and actual torque data of the electric drive system at different test operating points are collected according to the test plan. These data should cover all predetermined test conditions and environmental conditions. For each test operating point, calculate the deviation between the actual torque and the basic torque. The deviation can be the absolute difference in torque or the percentage of the deviation in the basic torque. The purpose of this step is to quantify the impact of the ripple signal on the performance of the electric drive system. Find the maximum value of the deviation between the actual torque and the basic torque among all test operating points. This maximum value represents the maximum performance impact on the electric drive system within the entire test range. Based on the maximum deviation value, the dynamic performance of the electric drive system under ripple interference can be evaluated. If the maximum deviation is within an acceptable range, it is considered that the electric drive system has good ripple robustness; otherwise, the design needs to be further optimized to improve its anti-interference ability.

[0042] The embodiments of the present application can systematically evaluate the performance of the electric drive system when it is disturbed by high-voltage internal network ripple, which helps to identify potential weak links in the system and provides strong data support for subsequent design optimization.

[0043] Optionally, the basic power parameters include at least: the assembly output power data of the electric drive system, the actual power parameters include at least: the power output data of the power supply end of the electric drive system under different test conditions, and the efficiency test results are obtained by the following steps: determining the efficiency test results based on the ratio of the power output data of the power supply end under the different test conditions to the assembly output power data.

[0044] In an embodiment of the present application, the output power data (such as output power) of the power supply end and the assembly output power data of the electric drive system are recorded respectively under each test condition. The ratio of the output power data of the power supply end to the assembly output power data is calculated based on these data. This ratio reflects the efficiency of the electric drive system in converting input power into output power under specific conditions. The efficiency test result is determined based on the calculated ratio. The higher this efficiency value, the smaller the loss of the electric drive system when converting energy, and the better the performance of the system.

[0045] It should be noted that the power supply end output power data and the assembly output power data may need to be selected and measured according to actual conditions during specific implementation. For example, the power supply end output power data may be obtained by measuring the output power of the motor controller, while the assembly output power data may be indirectly calculated by measuring the overall external work capability of the electric drive system (such as the torque and speed of the drive wheels).

[0046] Calculate the working efficiency η. The working efficiency can be calculated by the power comparison method or the cumulative energy method. The power comparison method is shown in formula (1). Specifically, based on the test time flow t, the mechanical power P output by the electric drive assembly sample is uut-out , and the output power P supply-out The cumulative energy method is shown in formula (2), which is specifically explained as the mechanical energy E output by the electric drive assembly sample based on the test time flow t. uut-out , and the power supply output energy E supply-out The percentage of the results.

[0047] (1) (2) The embodiments of the present application can more clearly reflect the impact of the high-voltage ripple test of the electric drive system of an electric vehicle on the vehicle's power efficiency through a detailed explanation of the basic power parameters and the actual power parameters, as well as an explanation of the method for obtaining the efficiency test results.

[0048] Optionally, the step 104 includes: Step 1041, performing Fourier transform on the vehicle ripple data of the time domain data type under each actual vehicle working condition, to obtain a vehicle high-voltage internal network spectrum diagram corresponding to each actual vehicle working condition.

[0049] In an embodiment of the present application, the ripple data of the high-voltage internal network of the whole vehicle under various working conditions collected from the actual vehicle is usually time domain data, that is, the data changes with time. In order to analyze the components of these data at different frequencies, a Fourier transform (Fast Fourier Transform, FFT) is required. FFT is a mathematical method for converting time domain signals into frequency domain signals. In this process, the time domain waveform is decomposed into a superposition of a series of sine waves and cosine waves of different frequencies, thereby revealing the frequency characteristics of the signal. Through FFT, a spectrum diagram of the high-voltage internal network of the whole vehicle under various actual vehicle working conditions can be obtained, which shows the intensity distribution of the signal at different frequencies.

[0050] The time domain data can be transformed into the frequency domain by performing a fast Fourier transform (FFT) according to the following formula (3), thus clearly showing the ripple amplitude at different frequencies: (3) Step 1042, fitting an envelope curve to the vehicle high-voltage internal network spectrum diagram as a ripple injection test parameter.

[0051] In the embodiment of the present application, on the spectrum diagram of the high-voltage internal network of the whole vehicle, the changes in signal strength at different frequencies can be observed, especially those frequency components with higher intensity, which are often the main causes of system instability or performance degradation. In order to more intuitively represent these key frequency components, an envelope line is usually drawn on the spectrum diagram. This line runs along the top or near the peak points on the spectrum diagram, thus summarizing the overall frequency characteristics of the signal. This envelope line will be used as a ripple injection test parameter in subsequent tests.

[0052] Step 1043, during the test of the electric drive system based on the ripple injection test matrix of the electric drive system, a simulated ripple signal is injected into the electric drive system based on the ripple injection test parameters to obtain actual power parameters of the electric drive system under ripple interference.

[0053] In an embodiment of the present application, a variety of electric drive system test conditions are combined based on different battery states, environmental loads, electric scenarios and feed scenarios to form a test matrix. This matrix defines all the operating conditions that need to be tested. The previously fitted envelope provides ripple amplitude and phase information at different frequencies, which will be used as parameters of the simulated ripple signal. During the test of the electric drive system, a ripple generator is used to inject simulated ripple signals into the electric drive system according to the test matrix and the ripple injection test parameters. These signals simulate the voltage fluctuations in the high-voltage internal network under actual vehicle conditions. After injecting the simulated ripple signal, the actual power parameters of the electric drive system, such as current, voltage, speed, torque, etc., are recorded. These parameters reflect the actual performance of the electric drive system under ripple interference.

[0054] By comparing the changes in power parameters before and after the ripple signal is injected, the ripple robustness and stability of the electric drive system can be evaluated. Specifically, the deviation between the actual torque and the target torque, the system efficiency and other indicators can be calculated to quantify the degree of performance degradation. Based on the test results, optimization suggestions for the design of the electric drive system can be put forward, such as improving the filter circuit design, adding anti-interference measures, etc., to improve the overall performance and stability of the system.

[0055] Optionally, the step 101 includes: Step 1011, obtaining vehicle parameters of the vehicle.

[0056] Step 1012, configuring test parameters based on a variety of different actual vehicle operating conditions.

[0057] Step 1013: debug the test bench based on the vehicle parameters.

[0058] 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.

[0059] 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.

[0060] Exemplarily, the vehicle parameters of the vehicle may be as shown in Table 1: Table 1

[0061] Of course, Table 1 is only an exemplary description and can be set according to actual needs, which is not limited here.

[0062] 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.

[0063] 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.).

[0064] 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.

[0065] For example, the parameters of the actual vehicle working condition can be as shown in Table 2: Table 2

[0066] Of course, Table 2 is only an exemplary description and can be set according to actual needs, which is not limited here.

[0067] Exemplarily, the acquisition parameters may be as shown in Table 3 below: Table 3

[0068] Of course, Table 3 is only an exemplary description and can be set according to actual needs, which is not limited here.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] Based on the same inventive concept, the embodiment of the present application also provides a ripple power test device for a vehicle electric drive system for implementing the ripple power 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 power test device for the vehicle electric drive system provided below can refer to the limitations of the ripple power test method for the vehicle electric drive system above, and will not be repeated here.

[0075] In an exemplary embodiment, Figure 3 As shown, a ripple power test device 20 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 processing module 202 is used to combine a plurality of different battery states, environmental loads, electric driving scenarios and feeding scenarios to obtain a ripple injection test matrix of the electric drive system corresponding to a plurality of electric drive system test conditions; Controlling the electric drive system to perform an initial test according to the ripple injection test matrix to obtain basic power parameters of the electric drive system without ripple interference; In the process of controlling the electric drive system to operate according to the ripple injection test matrix, a ripple signal is input into the electric drive system based on the vehicle ripple data to obtain actual power parameters of the electric drive system; The evaluation module 203 is used to analyze the basic power parameters and the actual power parameters to obtain the power evaluation result and efficiency test result of the vehicle.

[0076] Optionally, the basic power parameter at least includes: the basic torque of the electric drive system at different test operating points, and the actual power parameter at least includes: the actual torque of the electric drive system at different test operating points; the processing module 202 is further used to: A power evaluation result is determined based on a maximum value of a deviation between the actual torque and the basic torque at different test operating points.

[0077] Optionally, the basic power parameters at least include: the assembly output power data of the electric drive system, and the actual power parameters at least include: the power output data of the power supply end of the electric drive system under different test conditions; the processing module 202 is further used to: The efficiency test result is determined based on the ratio of the power output data of the power supply end to the power output data of the assembly under the different test conditions.

[0078] Optionally, the processing 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 power parameters of the electric drive system under ripple interference.

[0079] Optionally, the ripple collection module 201 is further used for: 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.

[0080] 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.

[0081] 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 power parameters, and the actual power parameters are compared with the basic power parameters of the electric drive system collected when no ripple signal is injected to determine the power evaluation result and the efficiency test result, so that the power evaluation result and the efficiency test result 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.

[0082] 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 4As 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 power test method for a vehicle electric drive system is implemented.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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).

[0089] 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.

[0090] 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.

[0091] 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 power test method for a vehicle electric drive system, characterized in that: The ripple power 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; Combine multiple different battery states, environmental loads, electric scenarios, and feeding scenarios to obtain a ripple injection test matrix for the electric drive system corresponding to multiple electric drive system test conditions; Controlling the electric drive system to perform an initial test according to the ripple injection test matrix to obtain basic power parameters of the electric drive system without ripple interference; In the process of controlling the electric drive system to operate according to the ripple injection test matrix, a ripple signal is input into the electric drive system based on the vehicle ripple data to obtain actual power parameters of the electric drive system; The basic power parameters and the actual power parameters are analyzed to obtain a power evaluation result and an efficiency test result of the vehicle.

2. The ripple power testing method of a vehicle electric drive system according to claim 1, characterized in that: The power evaluation result is obtained by the following steps: The basic power parameters at least include: the basic torque of the electric drive system at different test operating points, and the actual power parameters at least include: the actual torque of the electric drive system at different test operating points; A power evaluation result is determined based on a maximum value of a deviation between the actual torque and the basic torque at different test operating points.

3. The ripple power testing method of a vehicle electric drive system according to claim 1, characterized in that: The efficiency test results are obtained by the following steps: The basic power parameters at least include: the assembly output power data of the electric drive system, and the actual power parameters at least include: the power output data of the power supply end of the electric drive system under different test conditions; The efficiency test result is determined based on the ratio of the power output data of the power supply end to the power output data of the assembly under the different test conditions.

4. The ripple power testing method of a vehicle electric drive system according to claim 1, characterized in that: The step of inputting a ripple signal to the electric drive system based on the vehicle ripple data to obtain actual power parameters of the electric drive system during the process of controlling the electric drive system to operate according to the ripple injection test matrix comprises: 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 power parameters of the electric drive system under ripple interference.

5. The ripple power testing 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.

6. The ripple power testing method of a vehicle electric drive system according to claim 5, 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.

7. A ripple power test device for a vehicle electric drive system, characterized in that: The ripple power 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 processing module, used to combine multiple different battery states, environmental loads, electric scenarios and feeding scenarios to obtain a ripple injection test matrix of the electric drive system corresponding to multiple electric drive system test conditions; Controlling the electric drive system to perform an initial test according to the ripple injection test matrix to obtain basic power parameters of the electric drive system without ripple interference; In the process of controlling the electric drive system to operate according to the ripple injection test matrix, a ripple signal is input into the electric drive system based on the vehicle ripple data to obtain actual power parameters of the electric drive system; An evaluation module is used to analyze the basic power parameters and the actual power parameters to obtain a power evaluation result and an efficiency test 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 dynamics testing 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 power testing method for a vehicle electric drive system described in any one of claims 1 to 6 are implemented.

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

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