Ripple resonance point vibration adding test method, device and equipment of vehicle electric drive system

Abstract

The invention discloses a ripple resonance point vibration adding test method, device and equipment of a vehicle electric drive system, and relates to the technical field of intelligent automobiles, and the method comprises the steps: controlling a vehicle to operate under a plurality of different real vehicle working conditions, testing the whole vehicle high-voltage inner reticulate wave of the vehicle, and obtaining the high-voltage inner reticulate wave of the vehicle; obtaining whole vehicle ripple data corresponding to each real vehicle working condition; impedance testing is conducted on the electric driving system of the vehicle, and the resonant frequency of the electric driving system is determined based on obtained impedance data; the method comprises the following steps: carrying out initial test on an electric driving system, carrying out initial test on the electric driving system, and obtaining basic test data of the electric driving system; in the process of controlling the electric driving system to perform fixed-frequency operation according to the resonant frequency, inputting a ripple signal to the electric driving system based on the whole vehicle ripple data to obtain resonance point vibration adding test data of the electric driving system; and analyzing the basic test data and the resonance point vibration adding test data to obtain a resonance point vibration adding test evaluation result of the vehicle.

Description

Technical Field

[0001] The present application relates to the field of intelligent automobile technology, and in particular to a ripple resonance point vibration test 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 the present application is to provide a method, device and equipment for testing the ripple resonance point of 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 resonance point vibration 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 impedance test on an electric drive system of the vehicle, and determining a resonant frequency of the electric drive system based on the obtained impedance data; Performing an initial test on the electric drive system to obtain basic test data of the electric drive system; In the process of controlling the electric drive system to perform fixed-frequency operation according to the resonant frequency, a ripple signal is input into the electric drive system based on the vehicle ripple data to obtain resonance point vibration test data of the electric drive system; The basic test data and the resonance point vibration test data are analyzed to obtain a resonance point vibration test evaluation result of the vehicle.

[0007] Optionally, the step of performing an impedance test on the electric drive system of the vehicle and determining the resonant frequency of the electric drive system based on the obtained impedance data comprises: On the basis of the external characteristic curve of the electric drive system of the vehicle, different environmental loads are superimposed to obtain multiple impedance test conditions; In the process of controlling the electric drive system to operate under each of the impedance test conditions, an AC signal of a fixed amplitude is injected into the DC bus input side of the electric drive system to collect an actual ripple voltage value and an actual ripple current value of a high-voltage circuit of the electric drive system; The resonant frequency of the electric drive system is based on the actual ripple voltage value of the high-voltage circuit and the actual ripple current value of the high-voltage circuit.

[0008] Optionally, the step of determining the resonant frequency of the electric drive system based on the actual ripple voltage value of the high-voltage circuit and the actual ripple current value of the high-voltage circuit comprises: Based on the actual ripple voltage value of the high-voltage circuit and the actual ripple current value of the high-voltage circuit, calculating the impedance value of the electric drive system at different frequencies to draw an impedance characteristic curve of the electric drive system; The frequencies corresponding to the peak points and the valley points in the impedance characteristic curve of the electric drive system are used as the resonant frequencies of the electric drive system.

[0009] Optionally, the step of performing an initial test on the electric drive system to obtain basic test data of the electric drive system 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 basic test data of the electric drive system.

[0010] Optionally, in the process of controlling the electric drive system to perform fixed-frequency operation according to the resonant frequency, the step of inputting a ripple signal to the electric drive system based on the vehicle ripple data to obtain resonance point vibration test data of the electric drive system includes: Obtaining the ripple amplitude of the resonance point at the resonance frequency in the whole vehicle ripple data; In the process of controlling the electric drive system to perform fixed-frequency operation according to the resonant frequency, a ripple signal is input into the electric drive system based on the resonance point ripple amplitude to obtain resonance point vibration test data of the electric drive system.

[0011] 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.

[0012] 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.

[0013] In a second aspect, the present application provides a ripple resonance point vibration 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 testing module, configured to perform an impedance test on an electric drive system of the vehicle and determine a resonant frequency of the electric drive system based on the obtained impedance data; Performing an initial test on the electric drive system to obtain basic test data of the electric drive system; In the process of controlling the electric drive system to perform fixed-frequency operation according to the resonant frequency, a ripple signal is input into the electric drive system based on the vehicle ripple data to obtain resonance point vibration test data of the electric drive system; An evaluation module is used to analyze the basic test data and the resonance point vibration test data to obtain a resonance point vibration test evaluation result of the vehicle.

[0014] Optionally, the test module is further used to: On the basis of the external characteristic curve of the electric drive system of the vehicle, different environmental loads are superimposed to obtain multiple impedance test conditions; In the process of controlling the electric drive system to operate under each of the impedance test conditions, an AC signal of a fixed amplitude is injected into the DC bus input side of the electric drive system to collect an actual ripple voltage value and an actual ripple current value of a high-voltage circuit of the electric drive system; The resonant frequency of the electric drive system is based on the actual ripple voltage value of the high-voltage circuit and the actual ripple current value of the high-voltage circuit.

[0015] Optionally, the test module is further used to: Based on the actual ripple voltage value of the high-voltage circuit and the actual ripple current value of the high-voltage circuit, calculating the impedance value of the electric drive system at different frequencies to draw an impedance characteristic curve of the electric drive system; The frequencies corresponding to the peak points and the valley points in the impedance characteristic curve of the electric drive system are used as the resonant frequencies of the electric drive system.

[0016] 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 basic test data of the electric drive system.

[0017] Optionally, the test module is further used to: Obtaining the ripple amplitude of the resonance point at the resonance frequency in the whole vehicle ripple data; In the process of controlling the electric drive system to perform fixed-frequency operation according to the resonant frequency, a ripple signal is input into the electric drive system based on the resonance point ripple amplitude to obtain resonance point vibration test data of the electric drive system.

[0018] 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.

[0019] 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.

[0020] 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 resonance point vibration test method for a vehicle electric drive system described in any one of the above.

[0021] 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 resonance point vibration test method for a vehicle electric drive system as described in any one of the above.

[0022] 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 resonance point vibration test method for a vehicle electric drive system described in any one of the above.

[0023] According to the specific embodiments provided in this application, this application discloses the following technical effects: The present application provides a ripple resonance point vibration test method, device and equipment for a vehicle electric drive system. First, the whole vehicle ripple data collected under various real-time vehicle conditions are used to perform impedance testing on the vehicle's electric drive system to determine the resonant frequency of the electric drive system. Then, based on the whole vehicle ripple data, a ripple signal with the whole vehicle ripple characteristics under real-time vehicle conditions is injected into the electric drive system that operates at a fixed frequency according to the resonant frequency to collect the resonance point vibration test data. The resonance point vibration test data is analyzed with the basic test data of the electric drive system collected at the resonant frequency when the ripple signal is not injected to determine the resonance point vibration test evaluation result, so that the resonance point vibration test evaluation result 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

[0024] 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.

[0025] Figure 1 A schematic diagram of a flow chart of a ripple resonance point vibration test method for a vehicle electric drive system provided in one embodiment of the present application; Figure 2 A schematic diagram of the structure of a vehicle testing system provided in one embodiment of the present application; Figure 3 A schematic diagram of functional modules of a ripple resonance point vibration 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

[0026] 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.

[0027] like Figure 1 As shown, some embodiments of the present application provide a ripple resonance point vibration 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.

[0028] In the embodiment of the present application, it is necessary to determine a variety of actual vehicle conditions to be tested, and these actual vehicle 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 the test, it is necessary to install corresponding sensors, such as differential voltage probes and current clamps, on the high-voltage internal network of the test vehicle 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 types contained in the ripple data of the whole vehicle are 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. Finally, the vehicle is controlled to operate under the selected multiple actual vehicle conditions, and the data acquisition system synchronously records the ripple data of the high-voltage internal network. After each actual vehicle operating condition is completed, a set of corresponding vehicle ripple data will be obtained.

[0029] Step 102 : performing an impedance test on the electric drive system of the vehicle, and determining a resonant frequency of the electric drive system based on the obtained impedance data.

[0030] In the embodiment of the present application, an impedance test is performed on the electric drive system of the vehicle. A voltage probe and a current clamp are arranged on the DC bus input side of the electric drive system, an AC signal of a fixed amplitude is injected, and the impedance value of the electric drive system at different frequencies is calculated by measuring the voltage and current response at different frequencies. Based on these impedance data, the impedance characteristic curve of the electric drive system is drawn, and then the resonant frequency of the system is determined.

[0031] Step 103: perform an initial test on the electric drive system to obtain basic test data of the electric drive system.

[0032] In the embodiment of the present application, after finding the resonant frequency, the electric drive system is initially tested. The test bench simulates the wheel end speed, controls the electric drive system to operate according to its external characteristic curve, and records basic performance parameters under different working conditions, such as current, voltage, speed, torque, output power, temperature and other basic test data.

[0033] Step 104 , in the process of controlling the electric drive system to perform fixed frequency operation according to the resonant frequency, a ripple signal is input into the electric drive system based on the whole vehicle ripple data to obtain resonance point vibration test data of the electric drive system.

[0034] In the embodiment of the present application, the electric drive system is controlled to operate at a fixed frequency according to the determined resonant frequency, and a corresponding ripple signal is input to the electric drive system based on the previously collected vehicle ripple data. During the process of inputting the ripple signal, the operating state parameters of the electric drive system, such as current, voltage, output power, temperature, etc., are continuously monitored and recorded.

[0035] Step 105 , analyzing the basic test data and the resonance point vibration test data to obtain a resonance point vibration test evaluation result of the vehicle.

[0036] In the embodiment of the present application, the basic test data and the resonance point vibration test data are compared and analyzed. By comparing the changes in key parameters in the two sets of data, such as current fluctuations, voltage stability, output power changes, temperature changes, etc., the performance and robustness of the electric drive system at the resonant frequency are evaluated.

[0037] The embodiment of the present application first utilizes the whole vehicle ripple data collected under various real-time vehicle conditions to perform impedance testing on the vehicle's electric drive system to determine the resonant frequency of the electric drive system, and then, based on the whole vehicle ripple data, injects a ripple signal having the whole vehicle ripple characteristics under real-time vehicle conditions into the electric drive system that operates at a fixed frequency at the resonant frequency to collect resonant point vibration test data, and analyzes the data with the basic test data of the electric drive system at the resonant frequency collected when no ripple signal is injected to determine the resonant point vibration test evaluation result, so that the resonant point vibration test evaluation result 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.

[0038] Optionally, the step 102 includes: Step 1021 , superimposing different environmental loads on the basis of the external characteristic curve of the electric drive system of the vehicle to obtain a plurality of impedance test conditions.

[0039] Step 1022, while controlling the electric drive system to operate under each of the impedance test conditions, inject an AC signal of a fixed amplitude into the DC bus input side of the electric drive system to collect the actual ripple voltage value and the actual ripple current value of the high-voltage circuit of the electric drive system.

[0040] Step 1023: the resonant frequency of the electric drive system based on the actual ripple voltage value of the high-voltage circuit and the actual ripple current value of the high-voltage circuit.

[0041] The external characteristic curve of the electric drive system usually describes the system performance at different speeds and torques, including parameters such as output power and efficiency. However, in practical applications, the working environment of the electric drive system is complex and changeable, including multiple environmental factors such as temperature, humidity, and air pressure. In order to more accurately simulate the impact of these conditions on system performance, it is necessary to superimpose different environmental loads on the external characteristic curve of the electric drive system.

[0042] Environmental loads may include, but are not limited to: temperature, humidity, and vibration. Under different ambient temperatures, the performance of electronic components will change, affecting the efficiency and stability of the system. High humidity environments may cause insulation performance degradation and increase the risk of electrical failures. Vibration during vehicle driving may affect the reliability of electrical connections. By superimposing these environmental loads, multiple impedance test conditions can be generated, which are closer to the complex environment of electric vehicles in actual use.

[0043] For example, assuming that the environmental load includes the low voltage side voltage, the high voltage side voltage, and the ambient temperature, the environmental load can be expressed as in the following Table 1:

[0044] Table 1 Of course, this is just an exemplary description, and the specific environmental load can be set according to actual needs and is not limited here.

[0045] After determining the impedance test conditions, the next step is to inject a fixed amplitude AC signal into the DC bus input side of the electric drive system under each condition. The purpose of this step is to analyze the impedance characteristics of the electric drive system at different frequencies. The injected AC signal can simulate the ripple interference that may be encountered in actual work, thereby evaluating the system's response to ripple voltage and current. After injecting the AC signal, high-precision measurement equipment (such as voltage probes and current clamps) is required to collect the actual ripple voltage and current values ​​in the high-voltage circuit. These measurement data are the basis for subsequent analysis of the system's impedance characteristics and resonant frequency.

[0046] Exemplarily, different test conditions can be represented as shown in Table 2 below:

[0047] Table 2 Of course, this is just an example description, and the specific test conditions can be set according to actual needs and are not limited here.

[0048] According to Ohm's law (V=I×Z), where V is voltage, I is current, and Z is impedance, the impedance value can be calculated by measuring the actual ripple voltage and current values ​​of the high-voltage circuit. Then, by repeating the above steps at different frequencies, a series of impedance values ​​can be obtained, thereby drawing the impedance characteristic curve of the system. The resonant frequency refers to the frequency at which the current and voltage of the system will have a significant amplification effect due to the sudden decrease in impedance. Through the impedance characteristic curve, the resonant point of the system can be identified, that is, the frequency point with the minimum impedance value. This resonant point has an important impact on the stability of the system, because it may cause the system to have the risk of overcurrent, overheating or even damage at this frequency.

[0049] The embodiments of the present application help optimize system design and improve system stability and reliability by evaluating the impedance characteristics and resonant frequency of the electric drive system of an electric vehicle under different environmental conditions.

[0050] Optionally, the step 1023 includes: Step 10231, based on the actual ripple voltage value of the high-voltage circuit and the actual ripple current value of the high-voltage circuit, calculate the impedance value of the electric drive system at different frequencies to draw the impedance characteristic curve of the electric drive system.

[0051] Step 10232: Use the frequencies corresponding to the peak points and valley points in the impedance characteristic curve of the electric drive system as the resonant frequencies of the electric drive system.

[0052] Optionally, the step 103 includes: Step 1031 , 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.

[0053] Step 1032: 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 basic test data of the electric drive system.

[0054] In the embodiment of the present application, impedance (Z) is a physical quantity that measures the resistance of a circuit to alternating current, which reflects the ratio between voltage (V) and current (I). For an electric drive system, an AC signal with a fixed amplitude is injected into the input side of the DC bus, and the impedance of the system can be calculated by measuring the voltage and current values ​​at that position.

[0055] By changing the frequency of the injected AC signal, the voltage and current can be measured at multiple frequency points, and then the impedance value at the corresponding frequency can be calculated. After the impedance value at different frequencies is obtained by plotting the impedance characteristic curve of the electric drive system, the impedance characteristic curve of the electric drive system can be plotted. This curve takes the frequency as the horizontal coordinate and the impedance modulus (or real part, imaginary part) as the vertical coordinate. Through this curve, you can intuitively see how the system impedance changes with frequency. The impedance characteristic curve usually contains multiple peak points and valley points, which reflect the response characteristics of the system at different frequencies. Identify the resonant frequency The resonant frequency is a specific frequency at which the voltage and current waveforms in the system have the same phase. At this time, the impedance of the system is the smallest, and the current is easily amplified, which may cause the system to be unstable or even damaged. On the impedance characteristic curve, the resonant frequency usually corresponds to the minimum value (valley point) or maximum value point of the impedance (in some cases, the system may experience anti-resonance at certain frequencies, which is manifested as the impedance maximum value). Mark the frequencies corresponding to the peak points and valley points in the impedance characteristic curve, and these frequencies are considered to be the resonant frequencies of the electric drive system. In practical applications, special attention should be paid to these frequency points, avoid working at these frequencies, or take appropriate measures to suppress the occurrence of resonance.

[0056] The embodiment of the present application calculates the impedance value of the electric drive system at different frequencies based on the actual ripple voltage and current values ​​of the high-voltage circuit, and draws an impedance characteristic curve, which can effectively identify the resonant frequency of the system and help ensure the safe and reliable operation of the electric vehicle under various operating conditions.

[0057] Optionally, the step 104 includes: Step 1041, obtaining the ripple amplitude of the resonance point at the resonance frequency in the whole vehicle ripple data.

[0058] Step 1042: In the process of controlling the electric drive system to perform fixed-frequency operation according to the resonant frequency, a ripple signal is input into the electric drive system based on the ripple amplitude at the resonance point to obtain resonance point vibration test data of the electric drive system.

[0059] In the embodiment of the present application, in the high-voltage electrical system of the electric vehicle, due to the interaction of various electrical components within the system, resonance will occur at a specific frequency. The resonant frequency is the frequency point where the system impedance is the smallest. At this time, the voltage and current in the system may be significantly amplified, causing system instability or even damage. Therefore, it is first necessary to identify these resonant frequencies and obtain the ripple amplitude at these frequencies.

[0060] Specifically, through actual road tests or laboratory simulation tests, the high-voltage internal network ripple data of electric vehicles under different working conditions is collected. The collected time domain ripple data is transformed into the frequency domain by fast Fourier transform (FFT) to obtain the ripple spectrum. In the spectrum, the valley point or peak point in the impedance characteristic curve is found, and the frequency corresponding to these points is the resonant frequency. In the spectrum, the ripple amplitude corresponding to the resonant frequency is found, and this amplitude is the ripple amplitude at the resonance point.

[0061] On the test bench, the electric drive system is controlled to run at a fixed frequency at the resonant frequency. This usually involves simulating the wheel end speed, adjusting the control logic, etc. to ensure that the system runs stably at the specified frequency. Based on the ripple amplitude at the resonance point obtained previously, a signal generator is used to input a ripple signal of the same amplitude and frequency to the DC bus of the electric drive system. This signal should be able to simulate the voltage fluctuation under actual resonant conditions. During the operation of the electric drive system, high-precision test equipment is used to collect the operating status parameters of the system, including but not limited to voltage, current, power, temperature, etc. These data will be used to evaluate the performance and stability of the system under resonant conditions. The collected test data is analyzed to evaluate the voltage stability, current fluctuation, temperature distribution, and overall system performance of the electric drive system under resonant conditions. By comparing the baseline performance parameters with the test parameters, the impact of resonance on the system can be quantitatively evaluated.

[0062] The embodiment of the present application obtains the ripple amplitude of the high-voltage internal network of the electric vehicle at a specific resonant frequency and performs a resonant point vibration test on the electric drive system under laboratory conditions, which helps to evaluate the performance and stability of the electric drive system under resonant conditions. It also helps to discover and solve potential system instability problems and improve the overall safety and reliability of the electric vehicle.

[0063] Optionally, the step 101 includes: Step 1011, obtaining vehicle parameters of the vehicle.

[0064] Step 1012, configuring test parameters based on a variety of different actual vehicle operating conditions.

[0065] Step 1013: debug the test bench based on the vehicle parameters.

[0066] 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.

[0067] Optionally, the step 1021 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.

[0068] 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.

[0069] Exemplarily, the vehicle parameters of the vehicle may be as shown in Table 3 below:

[0070] Table 3 Of course, Table 3 is only an exemplary description and can be set according to actual needs, which is not limited here.

[0071] 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.

[0072] 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.).

[0073] Reference Figure 2The 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.

[0074] Adjust the test 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, control the test bench to simulate a variety of different real vehicle working conditions according to the pre-set test parameters.

[0075] For example, the parameters of the actual vehicle working condition can be as shown in Table 4:

[0076] Table 4 Of course, Table 4 is only an exemplary description and can be set according to actual needs, which is not limited here.

[0077] Exemplarily, the acquisition parameters may be as shown in Table 5 below:

[0078] Table 5 Of course, Table 5 is only an exemplary description and can be set according to actual needs, which is not limited here.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] Based on the same inventive concept, the embodiment of the present application also provides a ripple resonance point vibration test device for a vehicle electric drive system for implementing the ripple resonance point vibration 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 resonance point vibration test device for a vehicle electric drive system provided below can refer to the limitations of the ripple resonance point vibration test method for a vehicle electric drive system above, and will not be repeated here.

[0085] In an exemplary embodiment, Figure 3As shown, a ripple resonance point vibration test device 30 for a vehicle electric drive system is provided, comprising: The ripple collection module 301 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 testing module 302 is used to perform an impedance test on the electric drive system of the vehicle and determine a resonant frequency of the electric drive system based on the obtained impedance data; Performing an initial test on the electric drive system to obtain basic test data of the electric drive system; In the process of controlling the electric drive system to perform fixed-frequency operation according to the resonant frequency, a ripple signal is input into the electric drive system based on the vehicle ripple data to obtain resonance point vibration test data of the electric drive system; The evaluation module 303 is used to analyze the basic test data and the resonance point vibration test data to obtain the resonance point vibration test evaluation result of the vehicle.

[0086] Optionally, the testing module 302 is further used to: On the basis of the external characteristic curve of the electric drive system of the vehicle, different environmental loads are superimposed to obtain multiple impedance test conditions; In the process of controlling the electric drive system to operate under each of the impedance test conditions, an AC signal of a fixed amplitude is injected into the DC bus input side of the electric drive system to collect an actual ripple voltage value and an actual ripple current value of a high-voltage circuit of the electric drive system; The resonant frequency of the electric drive system is based on the actual ripple voltage value of the high-voltage circuit and the actual ripple current value of the high-voltage circuit.

[0087] Optionally, the testing module 302 is further used to: Based on the actual ripple voltage value of the high-voltage circuit and the actual ripple current value of the high-voltage circuit, calculating the impedance value of the electric drive system at different frequencies to draw an impedance characteristic curve of the electric drive system; The frequencies corresponding to the peak points and the valley points in the impedance characteristic curve of the electric drive system are used as the resonant frequencies of the electric drive system.

[0088] Optionally, the testing module 302 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 basic test data of the electric drive system.

[0089] Optionally, the testing module 302 is further used to: Obtaining the ripple amplitude of the resonance point at the resonance frequency in the whole vehicle ripple data; In the process of controlling the electric drive system to perform fixed-frequency operation according to the resonant frequency, a ripple signal is input into the electric drive system based on the resonance point ripple amplitude to obtain resonance point vibration test data of the electric drive system.

[0090] Optionally, the ripple collection module 301 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.

[0091] Optionally, the ripple collection module 301 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.

[0092] The embodiment of the present application publishes the conversation content between the first user terminal and the AI ​​language model to a display platform for other users to participate in the commentary process of the conversation content through the second terminal, thereby allowing users to obtain various comments on the conversation content of the AI ​​language model from various users, thereby improving the richness of the comments on the conversation content of the AI ​​language model.

[0093] 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 resonance point vibration test method for a vehicle electric drive system is implemented.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method 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), magnetic 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).

[0100] 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.

[0101] 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.

[0102] 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 resonance point vibration test method for a vehicle electric drive system, characterized in that: The ripple resonance point vibration 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 impedance test on an electric drive system of the vehicle, and determining a resonant frequency of the electric drive system based on the obtained impedance data; Performing an initial test on the electric drive system to obtain basic test data of the electric drive system; In the process of controlling the electric drive system to perform fixed-frequency operation according to the resonant frequency, a ripple signal is input into the electric drive system based on the vehicle ripple data to obtain resonance point vibration test data of the electric drive system; The basic test data and the resonance point vibration test data are analyzed to obtain a resonance point vibration test evaluation result of the vehicle.

2. The ripple resonance point vibration test method of the vehicle electric drive system according to claim 1, characterized in that: The step of performing an impedance test on the electric drive system of the vehicle and determining the resonant frequency of the electric drive system based on the obtained impedance data comprises: On the basis of the external characteristic curve of the electric drive system of the vehicle, different environmental loads are superimposed to obtain multiple impedance test conditions; In the process of controlling the electric drive system to operate under each of the impedance test conditions, an AC signal of a fixed amplitude is injected into the DC bus input side of the electric drive system to collect an actual ripple voltage value and an actual ripple current value of a high-voltage circuit of the electric drive system; The resonant frequency of the electric drive system is based on the actual ripple voltage value of the high-voltage circuit and the actual ripple current value of the high-voltage circuit.

3. The ripple resonance point vibration test method of the vehicle electric drive system according to claim 2, characterized in that: The step of adjusting the resonant frequency of the electric drive system based on the actual ripple voltage value of the high-voltage circuit and the actual ripple current value of the high-voltage circuit comprises: Based on the actual ripple voltage value of the high-voltage circuit and the actual ripple current value of the high-voltage circuit, calculating the impedance values ​​of the electric drive system at different frequencies to draw an impedance characteristic curve of the electric drive system; The frequencies corresponding to the peak points and the valley points in the impedance characteristic curve of the electric drive system are used as the resonant frequencies of the electric drive system.

4. The ripple resonance point vibration test method of a vehicle electric drive system according to claim 1, characterized in that: The step of performing an initial test on the electric drive system to obtain basic test data of the electric drive system 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 basic test data of the electric drive system.

5. The ripple resonance point vibration test method of the vehicle electric drive system according to claim 4, characterized in that: The step of inputting a ripple signal to the electric drive system based on the vehicle ripple data to obtain resonance point vibration test data of the electric drive system during the process of controlling the electric drive system to perform fixed frequency operation according to the resonant frequency comprises: Obtaining the ripple amplitude of the resonance point at the resonance frequency in the whole vehicle ripple data; In the process of controlling the electric drive system to perform fixed-frequency operation according to the resonant frequency, a ripple signal is input into the electric drive system based on the resonance point ripple amplitude to obtain resonance point vibration test data of the electric drive system.

6. The ripple resonance point vibration 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.

7. The ripple resonance point vibration test method of the vehicle electric drive system according to claim 6, 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.

8. A ripple resonance point vibration test device for a vehicle electric drive system, characterized in that: The ripple resonance point vibration 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 testing module, configured to perform an impedance test on an electric drive system of the vehicle and determine a resonant frequency of the electric drive system based on the obtained impedance data; Performing an initial test on the electric drive system to obtain basic test data of the electric drive system; In the process of controlling the electric drive system to perform fixed-frequency operation according to the resonant frequency, a ripple signal is input into the electric drive system based on the vehicle ripple data to obtain resonance point vibration test data of the electric drive system; An evaluation module is used to analyze the basic test data and the resonance point vibration test data to obtain a resonance point vibration test evaluation result of the vehicle.

9. 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 resonance point vibration test method for a vehicle electric drive system according to any one of claims 1 to 7.

10. 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 resonance point vibration test method for a vehicle electric drive system described in any one of claims 1 to 7 are implemented.

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