Electric drive system NVH performance test method and device, vehicle and storage medium

Abstract

The invention relates to the technical field of vehicle testing, in particular to an electric drive system NVH performance testing method and device, a vehicle and a storage medium, and the method comprises the steps that a noise testing point and a vibration testing point are arranged on the vehicle, and then a target acceleration driving test task and a target deceleration driving test task are executed; noise signals of the noise measuring points and vibration signals of the vibration measuring points are collected, then a curve of the total sound pressure level of the electric driving system changing along with the rotating speed and a curve of the main order noise of the electric driving system changing along with the rotating speed are generated, and a noise and vibration signal frequency spectrum waterfall plot used for main sound source distribution and resonance frequency analysis is generated. And generating an electric drive system automobile noise, vibration and sound vibration roughness (NVH) performance report. Therefore, the problems that a data processing method in the prior art lacks a unified standard, and specific test key points of the electric drive system are not clear, so that a test process of noise and vibration of the electric drive system lacks standardization, and a test result lacks pertinence and accuracy are solved.

Description

Technical Field

[0001] This application relates to the field of vehicle testing technology, and in particular to a method, equipment, vehicle, and storage medium for testing the NVH performance of an electric drive system. Background Technology

[0002] In the process of the automotive industry's transformation towards electrification and intelligence, vehicle NVH (Noise, Vibration, and Harshness) performance, as a core indicator for measuring driving comfort, has become a key factor restricting the improvement of overall vehicle comfort, and the need for optimization of related testing technologies is becoming increasingly urgent.

[0003] In related technologies, vehicle NVH performance testing adopts a technical path of data acquisition, model recognition, and report generation: first, the operating condition data, road condition data, and NVH signals of the vehicle during the automated testing process are acquired; then, the signal features are input into the recognition model to obtain the recognition results output by the recognition model; and finally, the operating condition data, road condition data, and recognition results are combined to generate an NVH performance report.

[0004] However, in related technologies, data processing methods lack unified standards and only generalize the testing of vehicle NVH performance without clarifying the specific testing focus of electric drive systems. This results in a lack of standardization in the testing process for noise and vibration of electric drive systems, and a lack of specificity and accuracy in the test results. Consequently, it is impossible to provide reliable data support for the evaluation and optimization design of NVH performance of electric drive systems, which urgently needs to be addressed. Summary of the Invention

[0005] This application provides a method, equipment, vehicle, and storage medium for testing the NVH performance of an electric drive system, in order to address the problem that related technologies lack unified standards for data processing methods and only generalize vehicle NVH performance testing without clarifying the specific testing focus of electric drive systems. This results in a lack of standardization in the testing process for noise and vibration of electric drive systems, and a lack of specificity and accuracy in the test results, which cannot provide reliable data support for the evaluation and optimization design of the NVH performance of electric drive systems.

[0006] The first aspect of this application provides a method for testing the NVH performance of an electric drive system, comprising the following steps: setting at least one noise measuring point and at least one vibration measuring point on a vehicle; performing a target acceleration driving test task and a deceleration driving test task to collect noise signals from the at least one noise measuring point and vibration signals from the at least one vibration measuring point; generating a curve showing the change of the total sound pressure level of the electric drive system with rotational speed and a curve showing the change of the main order noise of the electric drive system with rotational speed based on the noise signals and the vibration signals, and generating a noise and vibration signal spectrum waterfall plot for the analysis of the main sound source distribution and resonant frequency, so as to generate an NVH performance report of the electric drive system vehicle.

[0007] Based on the above technical means, this application embodiment ensures the targeted nature of NVH signal acquisition for the electric drive system by specifically setting noise and vibration measurement points, effectively avoiding interference from signals related to non-electric drive systems. Combined with target acceleration and deceleration driving test tasks, it covers the core dynamic operating conditions of the electric drive system, achieving complete capture of raw noise and vibration signals under different operating states. Furthermore, by converting the acquired signals into two types of core correlation curves and one type of specialized analysis chart, it achieves quantitative analysis and visualization of the NVH characteristics of the electric drive system, ultimately generating a dedicated NVH performance report for the electric drive system. This significantly improves the relevance and reliability of the test results, providing targeted and data-supported technical basis for NVH performance evaluation, problem tracing, and optimization design of the electric drive system, while also ensuring the standardization of the testing process and the comparability of the test data.

[0008] Optionally, in one embodiment of this application, before performing the target acceleration test task and the deceleration test task, the method further includes: obtaining at least one basic parameter of the vehicle, wherein the at least one basic parameter includes at least one of vehicle number, vehicle model, vehicle identification number, and mileage, for generating the NVH performance report; and / or, obtaining parameter information of the electric drive system, wherein the parameter information includes at least one of the following: peak power / peak torque parameter of the drive motor, continuous power / continuous torque parameter, maximum operating speed, rated voltage, number of slots, number of pole pairs, reducer ratio, and number of teeth of each gear, for generating the NVH performance report.

[0009] Based on the above technical means, the embodiments of this application, on the one hand, by introducing basic vehicle parameters, ensure that NVH performance reports of different vehicles and different test batches are traceable and distinguishable, thereby improving the standardization of test data management. On the other hand, by introducing electric drive system parameters, the inherent parameters of core components such as motors and reducers can be combined to explain the causes of NVH phenomena, thereby improving the analytical depth and practical value of the reports and enhancing the comparability of NVH performance between different electric drive systems.

[0010] Optionally, in one embodiment of this application, before performing the target acceleration test task and the deceleration test task, the method further includes: detecting whether the test site and the test environment meet the corresponding preset conditions; and allowing the test to start if the test site and the test environment both meet the preset conditions.

[0011] Based on the above technical means, the embodiments of this application ensure that all tests are carried out under unified conditions that meet certain requirements by detecting whether the test site and test environment meet certain conditions, thus ensuring the consistency and comparability of test data under different batches and different scenarios, and further enhancing the reliability and authority of the NVH performance test results of the electric drive system.

[0012] Optionally, in one embodiment of this application, the preset conditions of the test site include: a semi-anechoic chamber for the whole vehicle equipped with a low-noise chassis dynamometer, and the acoustic environment should meet the requirements of GB / T 6882 for the semi-anechoic chamber for the whole vehicle; the road surface meets the requirements of straight, jointless asphalt, and the road surface grade is in accordance with the Class A road surface specified in GB / T 7031; and during the measurement process, the distance between the vehicle and the object being tested is greater than a preset distance.

[0013] Based on the above technical means, the embodiments of this application, on the one hand, use a semi-anechoic chamber for the whole vehicle that meets national standards and a Class A road surface to minimize the interference caused by background noise, road unevenness and joint impact, and significantly improve the signal-to-noise ratio of the test signal. On the other hand, by controlling the distance between the test vehicle and surrounding objects, the reflection, scattering and airflow disturbance of external objects on the noise signal are avoided. At the same time, standardized site parameters ensure the repeatability and data comparability of the test process, and ensure the accuracy and reliability of the NVH performance test results of the electric drive system.

[0014] Optionally, in one embodiment of this application, the preset conditions of the test environment include: the air temperature is between 5°C and 35°C; and the wind speed at a preset height along the measurement route is less than a preset wind speed.

[0015] Based on the above technical means, the embodiments of this application, on the one hand, ensure the stable operation of the electric drive system under standard operating conditions by using a suitable temperature range, while ensuring the working accuracy of the test sensors and avoiding test data deviations caused by temperature anomalies. On the other hand, by controlling the upper limit of wind speed, the scattering and reflection of noise signals by airflow and the additional excitation on vibration acquisition are reduced, significantly improving the signal-to-noise ratio of NVH signals, realizing standardized control of the test environment, ensuring the comparability and consistency of data under different test scenarios, and further improving the accuracy and reliability of NVH performance test results of the electric drive system.

[0016] A second aspect of this application provides an NVH performance testing device for an electric drive system, comprising: a setting module for setting at least one noise measuring point and at least one vibration measuring point on a vehicle; an execution module for executing a target acceleration driving test task and a deceleration driving test task to collect noise signals from the at least one noise measuring point and vibration signals from the at least one vibration measuring point; and a testing module for generating a curve showing the total sound pressure level of the electric drive system as a function of rotational speed and a curve showing the main order noise of the electric drive system as a function of rotational speed based on the noise signals and the vibration signals, and generating a noise and vibration signal spectrum waterfall plot for analyzing the main sound source distribution and resonant frequency, so as to generate an NVH performance report for the electric drive system vehicle.

[0017] Based on the above technical means, this application embodiment ensures the targeted nature of NVH signal acquisition for the electric drive system by specifically setting noise and vibration measurement points, effectively avoiding interference from signals related to non-electric drive systems. Combined with target acceleration and deceleration driving test tasks, it covers the core dynamic operating conditions of the electric drive system, achieving complete capture of raw noise and vibration signals under different operating states. Furthermore, by converting the acquired signals into two types of core correlation curves and one type of specialized analysis chart, it achieves quantitative analysis and visualization of the NVH characteristics of the electric drive system, ultimately generating a dedicated NVH performance report for the electric drive system. This significantly improves the relevance and reliability of the test results, providing targeted and data-supported technical basis for NVH performance evaluation, problem tracing, and optimization design of the electric drive system, while also ensuring the standardization of the testing process and the comparability of the test data.

[0018] Optionally, in one embodiment of this application, it further includes: a first acquisition module, configured to acquire at least one basic parameter of the vehicle, wherein the at least one basic parameter includes at least one of vehicle number, vehicle model, vehicle identification number, and mileage, for generating the NVH performance report; and / or, a second acquisition module, configured to acquire parameter information of the electric drive system, wherein the parameter information includes at least one of peak power / peak torque parameters of the drive motor, continuous power / continuous torque parameters, maximum operating speed, rated voltage, number of slots, number of pole pairs, reducer ratio, and number of teeth of each gear, for generating the NVH performance report.

[0019] Based on the above technical means, the embodiments of this application, on the one hand, by introducing basic vehicle parameters, ensure that NVH performance reports of different vehicles and different test batches are traceable and distinguishable, thereby improving the standardization of test data management. On the other hand, by introducing electric drive system parameters, the inherent parameters of core components such as motors and reducers can be combined to explain the causes of NVH phenomena, thereby improving the analytical depth and practical value of the reports and enhancing the comparability of NVH performance between different electric drive systems.

[0020] Optionally, in one embodiment of this application, it further includes: a detection module for detecting whether the test site and the test environment meet the corresponding preset conditions; and an activation module for allowing the start of the test when the test site and the test environment both meet the preset conditions.

[0021] Based on the above technical means, the embodiments of this application ensure that all tests are carried out under unified conditions that meet certain requirements by detecting whether the test site and test environment meet certain conditions, thus ensuring the consistency and comparability of test data under different batches and different scenarios, and further enhancing the reliability and authority of the NVH performance test results of the electric drive system.

[0022] Optionally, in one embodiment of this application, the preset conditions of the test site include: a semi-anechoic chamber for the whole vehicle equipped with a low-noise chassis dynamometer, and the acoustic environment should meet the requirements of GB / T 6882 for the semi-anechoic chamber for the whole vehicle; the road surface meets the requirements of straight, jointless asphalt, and the road surface grade is in accordance with the Class A road surface specified in GB / T 7031; and during the measurement process, the distance between the vehicle and the object being tested is greater than a preset distance.

[0023] Based on the above technical means, the embodiments of this application, on the one hand, use a semi-anechoic chamber for the whole vehicle that meets national standards and a Class A road surface to minimize the interference caused by background noise, road unevenness and joint impact, and significantly improve the signal-to-noise ratio of the test signal. On the other hand, by controlling the distance between the test vehicle and surrounding objects, the reflection, scattering and airflow disturbance of external objects on the noise signal are avoided. At the same time, standardized site parameters ensure the repeatability and data comparability of the test process, and ensure the accuracy and reliability of the NVH performance test results of the electric drive system.

[0024] Optionally, in one embodiment of this application, the preset conditions of the test environment include: the air temperature is between 5°C and 35°C; and the wind speed at a preset height along the measurement route is less than a preset wind speed.

[0025] Based on the above technical means, the embodiments of this application, on the one hand, ensure the stable operation of the electric drive system under standard operating conditions by using a suitable temperature range, while ensuring the working accuracy of the test sensors and avoiding test data deviations caused by temperature anomalies. On the other hand, by controlling the upper limit of wind speed, the scattering and reflection of noise signals by airflow and the additional excitation on vibration acquisition are reduced, significantly improving the signal-to-noise ratio of NVH signals, realizing standardized control of the test environment, ensuring the comparability and consistency of data under different test scenarios, and further improving the accuracy and reliability of NVH performance test results of the electric drive system.

[0026] A third aspect of this application provides a vehicle, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the NVH performance testing method for an electric drive system as described in the above embodiments.

[0027] A fourth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described electric drive system NVH performance testing method.

[0028] A fifth aspect of this application provides a computer program product, including a computer program that, when executed, implements the above-described electric drive system NVH performance testing method.

[0029] This application's embodiments ensure the targeted acquisition of NVH signals from the electric drive system by specifically setting noise and vibration measurement points, effectively avoiding interference from signals related to non-electric drive systems. Combined with target acceleration and deceleration driving tests, it covers the core dynamic operating conditions of the electric drive system, achieving complete capture of raw noise and vibration signals under different operating states. By converting the acquired signals into two types of core correlation curves and one type of specialized analysis chart, it achieves quantitative analysis and visualization of the NVH characteristics of the electric drive system, ultimately generating a dedicated NVH performance report for the electric drive system. This significantly improves the relevance and reliability of the test results, providing targeted and data-supported technical evidence for NVH performance evaluation, problem tracing, and optimization design of the electric drive system. Simultaneously, it ensures the standardization of the testing process and the comparability of the test data. Therefore, it solves the problems in related technologies where data processing methods lack unified standards and only generalize vehicle NVH performance testing without clarifying the specific testing focus of the electric drive system. This leads to a lack of standardization in the testing process for noise and vibration of the electric drive system, and the test results lack relevance and accuracy, failing to provide reliable data support for NVH performance evaluation and optimization design of the electric drive system.

[0030] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0031] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart of an NVH performance testing method for an electric drive system according to an embodiment of this application; Figure 2 This is a schematic diagram showing the location of noise measurement points inside a two-row passenger vehicle according to an embodiment of this application; Figure 3 This is a schematic diagram showing the location of noise measurement points inside a three-row passenger vehicle according to an embodiment of this application; Figure 4 This is a schematic diagram illustrating the microphone position requirements according to one embodiment of this application; Figure 5 This is a flowchart illustrating the principle of an NVH performance testing method for an electric drive system according to an embodiment of this application. Figure 6 This is a block diagram of an electric drive system NVH performance testing device provided according to an embodiment of this application; Figure 7 This is a structural schematic diagram of a vehicle provided according to an embodiment of this application.

[0032] Figure label: 60 - NVH performance testing device for electric drive system; 100 - setting module, 200 - execution module, 300 - test module; 701 - memory, 702 - processor, 703 - communication interface. Detailed Implementation

[0033] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0034] The following description, with reference to the accompanying drawings, outlines an embodiment of an electric drive system NVH performance testing method, apparatus, vehicle, and storage medium. Addressing the issues raised in the background art, such as the lack of unified standards for data processing methods and the generalized approach to vehicle NVH performance testing without specifying the unique testing focus of electric drive systems, the present application provides an electric drive system NVH performance testing method. This method ensures the targeted acquisition of NVH signals from the electric drive system by specifically setting noise and vibration measurement points, effectively avoiding interference from signals unrelated to the electric drive system. This method combines target acceleration and deceleration driving tests to cover the core dynamic operating conditions of the electric drive system, achieving complete capture of raw noise and vibration signals under different operating states. By converting the collected signals into two types of core correlation curves and one type of specialized analysis chart, it enables quantitative analysis and visualization of the NVH characteristics of the electric drive system, ultimately generating a dedicated NVH performance report for the electric drive system. This significantly improves the relevance and reliability of the test results, providing targeted and data-supported technical evidence for NVH performance evaluation, problem tracing, and optimization design of the electric drive system. It also ensures the standardization of the testing process and the comparability of the test data. This addresses the problems in related technologies where data processing methods lack unified standards and only generalize vehicle NVH performance testing without clarifying the specific testing focus of the electric drive system. This results in a lack of standardization in the testing process for noise and vibration of the electric drive system, and a lack of relevance and accuracy in the test results, failing to provide reliable data support for NVH performance evaluation and optimization design of the electric drive system.

[0035] Specifically, Figure 1 This is a flowchart of an NVH performance testing method for an electric drive system according to an embodiment of this application.

[0036] like Figure 1 As shown, the NVH performance testing method for this electric drive system includes the following steps: In step S101, at least one noise measuring point and at least one vibration measuring point are installed on the vehicle.

[0037] It should be noted that, in this embodiment of the application, before setting noise and vibration measuring points on the vehicle, the instruments and equipment are first tested to see if they meet certain requirements.

[0038] Specifically, the acoustic measurement system used for noise measurement should meet the requirements of Type 1 instruments as specified in GB / T 3785.1, with a frequency range covering 20 Hz to 20 kHz. Before and after each measurement, each microphone must be calibrated using a Class 1 acoustic calibrator conforming to GB / T 15173. Under no adjustment conditions, the deviation between two calibrations should not exceed 0.5 dB. Measurement results are invalid if this deviation exceeds the tolerance.

[0039] Vibration acceleration sensors are used for vibration measurement. Specifically, they can be triaxial vibration acceleration sensors with a frequency response range of not less than 10 kHz and a weight of not more than 8g.

[0040] The accelerometer is capable of real-time acquisition and display of vehicle acceleration and deceleration, and also has a display interface and signal output port, with a display accuracy of not less than 0.1 m / s². 2 .

[0041] The data acquisition and analysis system has an A / D conversion resolution of no less than 24 bits and a data sampling capability of no less than 40 kHz. It also has measurement and spectrum analysis functions for sound pressure level, vibration level, and rotational speed.

[0042] Meteorological parameter measuring instruments may include, but are not limited to, thermometers and anemometers. The accuracy of thermometers should meet the limit of ±1℃, and the accuracy of anemometers should meet the limit of ±1.0m / s.

[0043] The chassis dynamometer's hub surface adopts a low-noise surface that simulates asphalt pavement, and has road load simulation capabilities with a control accuracy of no less than ±0.2%. Furthermore, the chassis dynamometer's load capacity, rated power absorption, rated torque absorption, and maximum test speed must meet the requirements of the test vehicle.

[0044] In actual implementation, after the testing instruments and equipment meet certain requirements, noise measurement points can be set on the vehicle in this embodiment of the application.

[0045] For example, such as Figure 2 As shown in the embodiment of this application, for a passenger vehicle with two rows of seats, microphones are respectively arranged in the outer ear of the left front seat and the outer ear of the right rear seat.

[0046] like Figure 3 As shown, in this embodiment of the application, for a passenger vehicle with three rows of seats, not only are microphones arranged on the outer ears of the left seats in the first row (front row) and the right seats in the second row (rear row), but a microphone is also added in the middle of the third row of seats.

[0047] like Figure 4As shown in the diagram, regarding the microphone position in this embodiment, the left-hand schematic indicates that the microphone should be installed at a vertical distance of 0.2 m ± 0.02 m from the lateral reference line of the seat (such as the seat's central axis). This position typically corresponds to the height range of an occupant's ear, accurately reflecting the noise level perceived by the driver and passengers. The right-hand schematic indicates that the microphone should be installed at a vertical distance of 0.7 m ± 0.05 m from the surface of the seat cushion. This height also closely matches the actual spatial position of the human ear, ensuring the correlation between noise signal acquisition and the occupant's subjective experience.

[0048] In addition, the embodiments of this application can also set vibration measurement points on the vehicle based on the vehicle coordinate system. It should be noted that the X direction is the front-to-back direction of the vehicle, with rearward being positive; the Y direction is the left-to-right direction of the vehicle, with rightward being positive; and the Z direction is the vertical direction of the vehicle, with upward being positive.

[0049] Specifically, in this embodiment, triaxial acceleration sensors are arranged at locations of interest in various components of the electric drive system, including but not limited to the drive motor housing, reducer housing, inverter housing, etc. Furthermore, the sensors are mounted on a rigid structural surface as close as possible to the excitation source, and the vibration transmission path to the excitation source has no vibration damping or isolation devices.

[0050] In step S102, the target acceleration driving test task and deceleration driving test task are performed to collect noise signals from at least one noise measuring point and vibration signals from at least one vibration measuring point.

[0051] It is understood that after noise and vibration measuring points are set on the vehicle in this embodiment of the application, the target acceleration driving test task and deceleration driving test task are then performed. However, before performing the task, in order to ensure the standardization and controllability of the test process and avoid the distortion of test data due to missing parameters, substandard site or environmental conditions, the relevant parameters of the test vehicle can be obtained first, and the test site and test environment can be checked to see if they meet the corresponding conditions.

[0052] Specifically, in one embodiment of this application, before performing the target acceleration driving test task and the deceleration driving test task, the method further includes: acquiring at least one basic parameter of the vehicle, wherein the basic parameter includes at least one of vehicle number, model, vehicle identification number, and mileage, for generating an NVH performance report; and / or acquiring parameter information of the electric drive system, wherein the parameter information includes at least one of the following: peak power / peak torque parameter of the drive motor, continuous power / continuous torque parameter, maximum operating speed, rated voltage, number of slots, number of pole pairs, reducer speed ratio, and number of teeth of each gear, for generating an NVH performance report.

[0053] In actual implementation, before performing the target acceleration and deceleration test tasks, this embodiment first obtains the vehicle's basic parameters and fills in the vehicle information table based on these parameters. The basic parameters may include, but are not limited to, vehicle number, vehicle model, vehicle identification number, and mileage. See Table 1 for details; Table 1 is the vehicle information table.

[0054] In addition, this application embodiment obtains the parameter information of the electric drive system and fills in the basic parameter information table of the electric drive system based on the parameter information. The parameter information may include, but is not limited to, the peak power / peak torque parameters of the drive motor, the continuous power / continuous torque parameters, the maximum operating speed, the rated voltage, the number of slots, the number of pole pairs, the speed ratio of the reducer, and the number of teeth of each gear. As shown in Table 2, Table 2 is the basic parameter information table of the electric drive system.

[0055] On the one hand, by introducing basic vehicle parameters, this application ensures that NVH performance reports for different vehicles and different test batches are traceable and distinguishable, thereby improving the standardization of test data management. On the other hand, by introducing electric drive system parameters, the inherent parameters of core components such as motors and reducers can be combined to explain the causes of NVH phenomena, thereby improving the analytical depth and practical value of the reports and enhancing the comparability of NVH performance between different electric drive systems.

[0056] Specifically, in one embodiment of this application, before performing the target acceleration driving test task and the deceleration driving test task, the method further includes: detecting whether the test site and test environment meet certain corresponding conditions; and allowing the test to start when the test site and test environment both meet certain conditions.

[0057] Table 1

[0058] Table 2

[0059] In the embodiments of this application, the test site is a fixed physical area with specific road surface characteristics and spatial bearing capacity, designated for the implementation of NVH performance testing of electric drive systems. Its core elements include road surface type (such as the material, texture and smoothness of the paved road surface), road surface slope, effective test length / width of the site and distribution of surrounding obstacles, etc., which provide a basic physical carrier for the standardization and safety of the test process.

[0060] In addition, the test environment refers to the external environmental parameters and conditions around the test site and in the test environment that may affect the accuracy of NVH signal acquisition and the stability of the test. Its core elements include ambient temperature, relative humidity, atmospheric pressure, ambient wind speed (including wind direction), background noise level and electromagnetic interference intensity, etc., which are used to ensure that noise and vibration signals are in a stable range through certain control standards, so as to avoid interference with the authenticity and accuracy of test data.

[0061] In actual execution, this application embodiment first detects whether the test site meets certain conditions and whether the test environment meets certain conditions. Then, if both the test site and the test environment meet the preset conditions, the test is allowed to start in order to perform the target acceleration test task and deceleration test task.

[0062] This application embodiment ensures that all tests are conducted under uniform conditions that meet certain requirements by checking whether the test site and test environment meet certain conditions, thus guaranteeing the consistency and comparability of test data under different batches and different scenarios, and further enhancing the reliability and authority of the NVH performance test results of the electric drive system.

[0063] In one embodiment of this application, certain conditions of the test site may include, but are not limited to: a semi-anechoic chamber for the whole vehicle equipped with a low-noise chassis dynamometer, and the acoustic environment should meet the requirements of GB / T 6882 for a semi-anechoic chamber for the whole vehicle; the road surface should meet the requirements of straight, jointless asphalt, and the road surface grade should be Class A road surface as specified in GB / T 7031; and during the measurement process, the distance between the vehicle and the object being tested should be greater than a certain distance.

[0064] In the embodiments of this application, the set object refers to various fixed or moving objects existing within and around the test site that may interfere with the NVH performance test of the electric drive system (such as reflected noise, signal obstruction, or affecting the stability of the vehicle's driving trajectory). These objects may include, but are not limited to, buildings, structures, road ancillary facilities, non-test vehicles, large equipment, and other physical objects that may affect the stability of the test environment or the accuracy of signal acquisition.

[0065] In addition, the "certain distance" refers to the minimum safe and interference-free distance threshold that the test vehicle must maintain between itself and the set object during the NVH signal acquisition phase to avoid adverse effects on the test process and results. Based on the test scenario requirements, this distance can be defined as 20 m. This is used to reduce the reflection and scattering interference of the set object on the noise signal, avoid airflow disturbances between surrounding objects and the test vehicle affecting vibration signal acquisition, and ensure stable vehicle operation under preset conditions, thereby ensuring the authenticity and reliability of the test data.

[0066] For example, certain conditions of the test site may include, but are not limited to: a semi-anechoic chamber for the whole vehicle equipped with a low-noise chassis dynamometer, and the acoustic environment should meet the requirements of GB / T 6882 for a semi-anechoic chamber for the whole vehicle; the road surface should meet the requirements of straight, jointless asphalt, and the road surface grade should be Class A as specified in GB / T 7031, the road surface should be dry, and during the measurement process, the distance between the test vehicle and large objects or other vehicles should be greater than 20 m.

[0067] This application embodiment, on the one hand, uses a semi-anechoic chamber for the whole vehicle that meets national standards and a Class A road surface to minimize interference from background noise, road unevenness, and impact from seams, significantly improving the signal-to-noise ratio of the test signal. On the other hand, by controlling the distance between the test vehicle and surrounding objects, it avoids the influence of external objects on the reflection, scattering, and airflow disturbance of the noise signal. At the same time, standardized site parameters ensure the repeatability and data comparability of the test process, ensuring the accuracy and reliability of the NVH performance test results of the electric drive system.

[0068] In addition, in one embodiment of this application, certain conditions of the test environment may include, but are not limited to: the air temperature being between 5°C and 35°C; and the wind speed at a certain altitude along the measurement route being less than a certain wind speed.

[0069] In this embodiment of the application, a certain height refers to a specific measurement height set in the NVH performance test of the electric drive system in order to accurately monitor the ambient wind speed that may affect the test signal. It can be defined as a height of 1.2 m distributed along the measurement route, which is used to fit the core area of ​​the main sound and vibration radiation during vehicle driving. It can truly reflect the actual impact of wind speed on NVH signal acquisition in the test environment, avoid wind speed data deviation caused by inconsistent measurement height, and ensure the standardization of test environment parameters.

[0070] In addition, a certain wind speed refers to the maximum allowable threshold of ambient wind speed set to avoid adverse interference of wind speed on the NVH test results of the electric drive system. It can be defined as 5 m / s to reduce the impact of airflow disturbance on the propagation path of noise signals, avoid high-speed airflow causing vibration of the measuring point or interfering with the sensor acquisition accuracy, ensure that noise and vibration signals can truly reflect the inherent NVH characteristics of the electric drive system, and ensure the accuracy and reliability of test data.

[0071] For example, certain conditions of the test environment may include, but are not limited to: an air temperature between 5°C and 35°C; and a wind speed of less than 5 m / s at a height of 1.2 m along the measurement route.

[0072] This application embodiment, on the one hand, ensures the stable operation of the electric drive system under standard operating conditions by using a suitable temperature range, while ensuring the working accuracy of the test sensors and avoiding test data deviations caused by temperature anomalies. On the other hand, by controlling the upper limit of wind speed, it reduces the scattering and reflection of noise signals by airflow and the additional excitation on vibration acquisition, significantly improving the signal-to-noise ratio of NVH signals, realizing standardized control of the test environment, ensuring the comparability and consistency of data under different test scenarios, and further improving the accuracy and reliability of NVH performance test results of the electric drive system.

[0073] Based on the description of other embodiments, after obtaining the relevant parameters of the test vehicle and detecting that the test site and test environment meet the corresponding certain conditions, this application embodiment executes the target acceleration driving test task and deceleration driving test task to collect the noise signal of at least one noise measuring point and the vibration signal of at least one vibration measuring point.

[0074] It should be noted that the target acceleration test task refers to a test conducted by a person skilled in the art, whereby the vehicle is placed in Drive (D) gear and, starting from a stationary position, the vehicle accelerates at speeds of (1 ± 0.2) m / s. 2 (2±0.2) m / s 2 The vehicle was accelerated to a speed of 120 km / h, and the vibration noise and drive motor speed or drive half shaft speed data at each measuring point were recorded simultaneously during the acceleration process. The recording was repeated three times.

[0075] In addition, the target deceleration driving test task refers to a person skilled in the art placing the vehicle in D gear and starting from a speed of 120 km / h, causing the vehicle to decelerate at (-1±0.2) m / s. 2 (-2±0.2) m / s 2 The system decelerates and coasts to a stop, simultaneously recording vibration and noise levels at various measuring points, as well as the speed of the drive motor or drive half-shaft during the deceleration process. This recording is repeated three times.

[0076] In the embodiments of this application, the noise signal refers to the time-domain signal collected by the acoustic signal acquisition device (such as a microphone) at the noise measurement point in the NVH test of the electric drive system during the operation of the electric drive system (including acceleration and deceleration), which can characterize the physical characteristics of the radiated noise of the electric drive system. It is the original data basis for the subsequent generation of noise correlation curves and charts.

[0077] In addition, vibration signal refers to the time-domain signal collected by vibration sensing devices (such as accelerometers) at vibration measurement points in the NVH test of electric drive system during the operation of electric drive system (including acceleration and deceleration), which can characterize the vibration physical characteristics of electric drive system, and provides original data support for subsequent vibration analysis and acoustic-vibration coupling characteristic research.

[0078] Specifically, in the embodiments of this application, when collecting noise signals from noise measurement points and vibration signals from vibration measurement points, the vibration signal analysis frequency should be no less than 12800 Hz, the noise signal analysis frequency should be no less than 25600 Hz, the frequency resolution is set to 1 Hz, the rotational speed step size for rotational speed tracking analysis is set to 25 r, and the bandwidth for order analysis is (0.5±0.25) orders.

[0079] In step S103, based on the noise signal and vibration signal, the curves of the total sound pressure level of the electric drive system as a function of rotational speed and the curves of the main order noise of the electric drive system as a function of rotational speed are generated, and a waterfall plot of the noise and vibration signal spectrum is generated for the analysis of the main sound source distribution and resonance frequency, so as to generate a vehicle noise, vibration and acoustic roughness (NVH) performance report of the electric drive system.

[0080] In the embodiments of this application, the curve of the total sound pressure level of the electric drive system as a function of rotational speed is a two-dimensional characteristic curve. The horizontal axis is the operating speed of the electric drive system (usually in r / min), and the vertical axis is the total sound pressure level of the radiated noise of the electric drive system at the corresponding speed (usually in dB(A)). It is used to quantitatively present the intensity change of the overall noise of the system under different speed conditions, intuitively reflect the dynamic correlation between the rotational speed of the electric drive system and the total noise level, and can clearly identify the trend of the total noise intensity as the speed increases or decreases and the key speed range (such as the speed point corresponding to the noise peak).

[0081] In addition, the curve of the main order noise of the electric drive system with rotational speed is a two-dimensional curve that focuses on the key order noise characteristics. Its horizontal axis is the operating speed of the electric drive system (usually in r / min), and the vertical axis is the noise amplitude (usually in dB(A)) of the main order related to the structural parameters (number of pole pairs, number of gear teeth, speed ratio, etc.) of the core components of the electric drive system (such as drive motor, reducer). It is used to characterize the core order noise that affects the NVH performance of the system and can intuitively present the variation law of specific order noise with rotational speed.

[0082] In addition, the noise and vibration signal spectrum waterfall chart is a three-dimensional visualization analysis chart. It uses time (or the rotational speed of the electric drive system) as the horizontal axis, signal frequency (usually in Hz) as the vertical axis, and signal amplitude (sound pressure level dB(A) or vibration acceleration m / s²) as the third dimension (characterized by color depth or grayscale level). It is used to dynamically present the frequency distribution and amplitude variation of noise and vibration signals under different time / rotational speed conditions.

[0083] In actual implementation, this application embodiment uses signal processing technology to extract the quantitative features and frequency information of the collected noise and vibration signals, generating two types of core correlation curves and one type of special analysis chart (curve of total sound pressure level of electric drive system with speed, curve of main order noise of electric drive system with speed, and waterfall plot of noise and vibration signal spectrum). Then, the three types of analysis results are integrated to sort out the NVH performance and potential problems of electric drive system, and form a performance report that can comprehensively and quantitatively reflect the NVH characteristics of electric drive system.

[0084] It should be noted that the performance report may include, but is not limited to, the test basis, test purpose, test object, test location, test date, test conditions, test method, test results, result analysis, and test conclusion.

[0085] The principle of the NVH performance testing method for electric drive systems proposed in this application is illustrated below with a specific embodiment.

[0086] Figure 5 This is a flowchart illustrating the principle of an NVH performance testing method for an electric drive system according to an embodiment of this application.

[0087] Step S501: Set up the test site and test environment.

[0088] In this embodiment, the test site and test environment are set up so that the test site and test environment meet certain corresponding conditions.

[0089] Specifically, certain conditions of the test site may include, but are not limited to: a semi-anechoic chamber for the whole vehicle equipped with a low-noise chassis dynamometer, and the acoustic environment should meet the requirements of GB / T 6882 for semi-anechoic chambers for the whole vehicle; the road surface should meet the requirements of straight, jointless asphalt, and the road surface grade should be Class A as specified in GB / T 7031, the road surface should be dry, and during the measurement process, the distance between the test vehicle and large objects or other vehicles should be greater than 20 m.

[0090] In addition, certain conditions of the test environment may include, but are not limited to: air temperature between 5℃ and 35℃; and wind speed less than 5 m / s at a height of 1.2 m along the measurement route.

[0091] Step S502: Set up the instruments and equipment.

[0092] In this embodiment of the application, the instruments and equipment are configured to meet certain requirements.

[0093] Specifically, the acoustic measurement system used for noise measurement should meet the requirements of Type 1 instruments as specified in GB / T 3785.1, and its frequency range should cover 20 Hz to 20 kHz. Before and after each measurement, each microphone must be calibrated using a Class 1 acoustic calibrator conforming to GB / T 15173. Under no adjustment conditions, the deviation between two calibrations should not exceed 0.5 dB. Measurement results are invalid if this deviation exceeds the tolerance.

[0094] Vibration acceleration sensors are used for vibration measurement. Specifically, they can be triaxial vibration acceleration sensors with a frequency response range of not less than 10 kHz and a weight of not more than 8g.

[0095] The accelerometer is capable of real-time acquisition and display of vehicle acceleration and deceleration, and also has a display interface and signal output port, with a display accuracy of not less than 0.1 m / s². 2 .

[0096] The data acquisition and analysis system has an A / D conversion resolution of no less than 24 bits and a data sampling capability of no less than 40 kHz. It also has measurement and spectrum analysis functions for sound pressure level, vibration level, and rotational speed.

[0097] Meteorological parameter measuring instruments may include, but are not limited to, thermometers and anemometers. The accuracy of thermometers shall meet the limit of ±1℃, and the accuracy of anemometers shall meet the limit of ±1.0m / s.

[0098] The chassis dynamometer's hub surface adopts a low-noise hub surface that simulates asphalt pavement, has road load simulation function, and control accuracy of not less than ±0.2%. Furthermore, the chassis dynamometer's load capacity, rated absorption power, rated absorption torque, and maximum test speed meet the requirements of the test vehicle.

[0099] Step S503: Obtain the basic parameters of the vehicle and the parameter information of the electric drive system.

[0100] In this embodiment of the application, the basic parameters of the vehicle are obtained and the vehicle information table is filled in according to the basic parameters. The basic parameters may include, but are not limited to, vehicle number, vehicle model, vehicle identification number, and mileage.

[0101] In addition, the embodiments of this application obtain parameter information of the electric drive system and fill in the basic parameter information table of the electric drive system according to the parameter information. The parameter information may include, but is not limited to, peak power / peak torque parameters of the drive motor, continuous power / continuous torque parameters, maximum operating speed, rated voltage, number of slots, number of magnetic pole pairs, speed ratio of reducer, and number of teeth of each gear.

[0102] Step S504: Arrange noise measurement points and vibration measurement points.

[0103] In this embodiment of the application, for passenger vehicles with two rows of seats, microphones are arranged on the outer ears of the front left seat and the rear right seat. In this embodiment of the application, for passenger vehicles with three rows of seats, microphones are arranged not only on the outer ears of the first row (front) seat and the second row (rear) seat, but also in the middle of the third row of seats.

[0104] In addition, this application embodiment can also set vibration measurement points on the vehicle based on the vehicle coordinate system. Specifically, this application embodiment arranges triaxial acceleration sensors at the locations of interest in various components of the electric drive system, which may include, but are not limited to, the drive motor housing, reducer housing, inverter housing, etc. The sensors are mounted on a rigid structural surface, close to the excitation source, and there are no vibration damping or isolation devices on the vibration transmission path to the excitation source.

[0105] Step S505: Perform the target acceleration driving test task and deceleration driving test task.

[0106] In this embodiment, the target acceleration driving test task and deceleration driving test task are performed to collect noise signals from at least one noise measuring point and vibration signals from at least one vibration measuring point.

[0107] It should be noted that the target acceleration driving test task refers to the process by which a person skilled in the art places the vehicle in D gear and, starting from a fixed position, accelerates the vehicle at accelerations of (1±0.2) m / s2 and (2±0.2) m / s2 respectively until the vehicle speed reaches 120 km / h. During the acceleration driving process, the vibration noise and drive motor speed or drive half shaft speed data at each measuring point are recorded simultaneously, and the recording is repeated three times.

[0108] In addition, the target deceleration driving test task refers to the technical personnel in the field placing the vehicle in D gear, starting from a speed of 120 km / h, and causing the vehicle to decelerate at a deceleration rate of (-1±0.2) m / s2, (-2±0.2) m / s2 respectively, and coasting to a stop, while simultaneously recording the vibration noise and drive motor speed or drive half shaft speed data at each measuring point during the deceleration driving process, and repeating the recording three times.

[0109] Step S506: Generate an NVH performance report for the electric drive system vehicle.

[0110] In this embodiment, based on noise and vibration signals, a curve showing the change of the total sound pressure level of the electric drive system with rotational speed and a curve showing the change of the main order noise of the electric drive system with rotational speed are generated. A waterfall plot of the noise and vibration signal spectrum is also generated for the analysis of the main sound source distribution and resonant frequency, so as to generate an NVH performance report of the electric drive system vehicle.

[0111] The NVH performance testing method for electric drive systems proposed in this application ensures the targeted acquisition of NVH signals by setting specific noise and vibration measurement points, effectively avoiding interference from signals related to non-electric drive systems. Combined with target acceleration and deceleration driving tests, it covers the core dynamic operating conditions of the electric drive system, achieving complete capture of raw noise and vibration signals under different operating states. By converting the acquired signals into two types of core correlation curves and one type of specialized analysis chart, it achieves quantitative analysis and visualization of the NVH characteristics of the electric drive system, ultimately generating a dedicated NVH performance report for the electric drive system. This significantly improves the relevance and reliability of the test results, providing targeted and data-supported technical basis for NVH performance evaluation, problem tracing, and optimization design of the electric drive system, while also ensuring the standardization of the testing process and the comparability of the test data. This solves the problem that related technologies lack unified standards for data processing methods and only generalize vehicle NVH performance testing without clarifying the specific testing focus of electric drive systems. As a result, the testing process for noise and vibration of electric drive systems lacks standardization, and the test results lack specificity and accuracy, failing to provide reliable data support for the evaluation and optimization design of NVH performance of electric drive systems.

[0112] Next, the NVH performance testing apparatus for an electric drive system proposed according to an embodiment of this application is described with reference to the accompanying drawings.

[0113] Figure 6 This is a block diagram of an electric drive system NVH performance testing device provided according to an embodiment of this application.

[0114] like Figure 6 As shown, the NVH performance testing device 60 for the electric drive system includes: a setting module 100, an execution module 200, and a testing module 300.

[0115] The setting module 100 is used to set at least one noise measuring point and at least one vibration measuring point on the vehicle.

[0116] The execution module 200 is used to perform target acceleration driving test tasks and deceleration driving test tasks to collect noise signals from at least one noise measurement point and vibration signals from at least one vibration measurement point.

[0117] Test module 300 is used to generate curves of total sound pressure level of electric drive system as a function of rotational speed and curves of main order noise of electric drive system as a function of rotational speed based on noise and vibration signals, and to generate noise and vibration signal spectrum waterfall plots for analysis of main sound source distribution and resonant frequency, so as to generate a noise, vibration and acoustic roughness (NVH) performance report of electric drive system vehicle.

[0118] Optionally, in one embodiment of this application, it further includes: a first acquisition module and a second acquisition module.

[0119] The first acquisition module is used to acquire at least one basic parameter of the vehicle, wherein the at least one basic parameter includes at least one of vehicle number, vehicle model, vehicle identification number, and mileage, for the purpose of generating an NVH performance report.

[0120] The second acquisition module is used to acquire parameter information of the electric drive system. The parameter information includes at least one of the following: peak power / peak torque parameters of the drive motor, continuous power / continuous torque parameters, maximum operating speed, rated voltage, number of slots, number of pole pairs, speed ratio of the reducer, and number of teeth of each gear, in order to generate an NVH performance report.

[0121] Optionally, in one embodiment of this application, it further includes a detection module and an activation module.

[0122] The detection module is used to detect whether the test site and test environment meet the corresponding preset conditions.

[0123] The activation module is used to allow the test to begin when the test site and test environment both meet the preset conditions.

[0124] Optionally, in one embodiment of this application, the preset conditions of the test site include: a semi-anechoic chamber for the whole vehicle equipped with a low-noise chassis dynamometer, and the acoustic environment should meet the requirements of GB / T 6882 for a semi-anechoic chamber for the whole vehicle; the road surface meets the requirements of straight, jointless asphalt, and the road surface grade is in accordance with the Class A road surface specified in GB / T 7031; and during the measurement process, the distance between the vehicle and the object being tested is greater than a preset distance.

[0125] Optionally, in one embodiment of this application, the preset conditions of the test environment include: the air temperature is between 5°C and 35°C; and the wind speed at a preset height along the measurement route is less than a preset wind speed.

[0126] It should be noted that the foregoing explanation of the embodiment of the electric drive system NVH performance testing method also applies to the electric drive system NVH performance testing device of this embodiment, and will not be repeated here.

[0127] The NVH performance testing device for electric drive systems proposed in this application ensures the targeted acquisition of NVH signals by setting specific noise and vibration measurement points, effectively avoiding interference from signals related to non-electric drive systems. Combined with target acceleration and deceleration driving test tasks, it covers the core dynamic operating conditions of the electric drive system, achieving complete capture of raw noise and vibration signals under different operating states. By converting the acquired signals into two types of core correlation curves and one type of specialized analysis chart, it achieves quantitative analysis and visualization of the NVH characteristics of the electric drive system, ultimately generating a dedicated NVH performance report for the electric drive system. This significantly improves the relevance and reliability of the test results, providing targeted and data-supported technical basis for NVH performance evaluation, problem tracing, and optimized design of the electric drive system, while also ensuring the standardization of the testing process and the comparability of the test data. This solves the problem that related technologies lack unified standards for data processing methods and only generalize vehicle NVH performance testing without clarifying the specific testing focus of electric drive systems. As a result, the testing process for noise and vibration of electric drive systems lacks standardization, and the test results lack specificity and accuracy, failing to provide reliable data support for the evaluation and optimization design of NVH performance of electric drive systems.

[0128] Figure 7 This is a schematic diagram of the structure of a vehicle according to an embodiment of this application. The vehicle may include: The memory 701, the processor 702, and the computer program stored on the memory 701 and executable on the processor 702.

[0129] When the processor 702 executes the program, it implements the NVH performance testing method for the electric drive system provided in the above embodiments.

[0130] Furthermore, the vehicle also includes: Communication interface 703 is used for communication between memory 701 and processor 702.

[0131] The memory 701 is used to store computer programs that can run on the processor 702.

[0132] The memory 701 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0133] If the memory 701, processor 702, and communication interface 703 are implemented independently, then the communication interface 703, memory 701, and processor 702 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized into address buses, data buses, control buses, etc. For ease of representation, Figure 7 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0134] Optionally, in a specific implementation, if the memory 701, processor 702, and communication interface 703 are integrated on a single chip, then the memory 701, processor 702, and communication interface 703 can communicate with each other through an internal interface.

[0135] The processor 702 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0136] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the above-described electric drive system NVH performance testing method.

[0137] This application also provides a computer program product, including a computer program that, when executed, implements the above-described electric drive system NVH performance testing method.

[0138] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0139] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0140] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0141] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0142] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, it can be implemented using any one or more of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0143] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0144] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0145] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A method for testing the NVH performance of an electric drive system, characterized in that, Includes the following steps: At least one noise measurement point and at least one vibration measurement point are installed on the vehicle; Perform target acceleration driving test tasks and deceleration driving test tasks to collect noise signals from at least one noise measuring point and vibration signals from at least one vibration measuring point; Based on the noise signal and the vibration signal, a curve showing the total sound pressure level of the electric drive system as a function of rotational speed and a curve showing the main order noise of the electric drive system as a function of rotational speed are generated. A waterfall plot of the noise and vibration signal spectrum is also generated for the analysis of the main sound source distribution and resonant frequency, so as to generate a noise, vibration and acoustic roughness (NVH) performance report of the electric drive system.

2. The method according to claim 1, characterized in that, Before performing the target acceleration test task and the deceleration test task, the following is also included: At least one basic parameter of the vehicle is obtained, wherein the at least one basic parameter includes at least one of vehicle number, vehicle model, vehicle identification number, and mileage, for use in generating the NVH performance report; And / or, obtain parameter information of the electric drive system, wherein the parameter information includes at least one of the following: peak power / peak torque parameters of the drive motor, continuous power / continuous torque parameters, maximum operating speed, rated voltage, number of slots, number of pole pairs, speed ratio of the reducer, and number of teeth of each gear, for use in generating the NVH performance report.

3. The method according to claim 1, characterized in that, Before performing the target acceleration test task and the deceleration test task, the following is also included: Test whether the test site and test environment meet the corresponding preset conditions; If the test site and the test environment both meet the preset conditions, the test may begin.

4. The method according to claim 3, characterized in that, The preset conditions of the test site include: The vehicle semi-anechoic chamber is equipped with a low-noise chassis dynamometer, and the acoustic environment should meet the requirements of GB / T 6882 for the vehicle semi-anechoic chamber. The road surface meets the requirements of being straight and seamless asphalt, and the road surface grade is in accordance with Class A road surface as specified in GB / T 7031. In addition, during the measurement process, the distance between the vehicle and the object being measured is greater than the preset distance.

5. The method according to claim 3, characterized in that, The preset conditions of the test environment include: Temperatures range from 5℃ to 35℃; The wind speed at a preset height along the measurement route is less than the preset wind speed.

6. A device for testing the NVH performance of an electric drive system, characterized in that, include: The module is configured to set at least one noise measurement point and at least one vibration measurement point on the vehicle. An execution module is used to perform target acceleration driving test tasks and deceleration driving test tasks to collect noise signals from at least one noise measuring point and vibration signals from at least one vibration measuring point; The testing module is used to generate curves showing the total sound pressure level of the electric drive system as a function of rotational speed and the main order noise of the electric drive system as a function of rotational speed, based on the noise signal and the vibration signal. It also generates a waterfall plot of the noise and vibration signal spectrum for the analysis of the main sound source distribution and resonant frequency, in order to generate a NVH performance report of the electric drive system.

7. The apparatus according to claim 6, characterized in that, Also includes: The first acquisition module is used to acquire at least one basic parameter of the vehicle, wherein the at least one basic parameter includes at least one of vehicle number, vehicle model, vehicle identification number, and mileage, for the purpose of generating the NVH performance report; And / or, the second acquisition module is used to acquire parameter information of the electric drive system, wherein the parameter information includes at least one of the following: peak power / peak torque parameters of the drive motor, continuous power / continuous torque parameters, maximum operating speed, rated voltage, number of slots, number of pole pairs, speed ratio of the reducer, and number of teeth of each gear, for use in generating the NVH performance report.

8. A vehicle, characterized in that, include: The system includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the NVH performance testing method for an electric drive system as described in any one of claims 1-5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the NVH performance testing method for an electric drive system as described in any one of claims 1-5.

10. A computer program product, comprising a computer program, characterized in that, The computer program is executed to implement the NVH performance testing method for an electric drive system as described in any one of claims 1-5.

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