Vehicle fan and engine noise testing method and device, vehicle and medium

Abstract

The invention relates to the technical field of vehicle acoustics and vibration control, in particular to a vehicle fan and engine noise testing method and device, a vehicle and a medium, and the method comprises the steps: obtaining the testing process data of a fan and an engine; testing equipment is controlled to test the fan and the engine according to the testing process data, and fan rotating speed data, fan noise data and engine noise data in the testing process are obtained; a fan first-order noise curve is generated according to the fan rotating speed data and the fan noise data, engine second-order noise values at different rotating speeds are calculated according to the engine noise data, and the beat vibration noise of the fan and the engine is recognized according to the fan first-order noise curve and the engine second-order noise values. Therefore, the problems that in the related technology, when the beat vibration noise of the fan and the engine of the whole vehicle is tested, testing is not comprehensive, and testing is not stable due to environmental interference are solved.

Description

Technical Field

[0001] This application relates to the field of vehicle acoustics and vibration control technology, and in particular to a method, apparatus, vehicle, and medium for testing fan and engine noise in a vehicle. Background Technology

[0002] Hybrid vehicles have high engine idle speeds and wide fan speed ranges. When the first-order excitation of the fan approaches the second-order excitation of the engine, it is prone to generating flapping noise. Therefore, developing testing and evaluation methods for the flapping noise of the vehicle's fan and engine has become a core technology of concern for vehicle manufacturers.

[0003] In related technologies, the flapping noise of the fan and engine is tested through vehicle road tests. However, the fan speed is affected by many factors, making it difficult to cover the entire operating speed range of the fan in actual road tests. At the same time, environmental conditions have a significant impact on the test results, resulting in an incomplete and unstable flapping noise test. Summary of the Invention

[0004] This application provides a method, apparatus, vehicle, and medium for testing the noise of a vehicle's fan and engine, in order to solve the problems of incomplete testing and instability due to environmental interference when testing the vibration noise of a vehicle's fan and engine.

[0005] The first aspect of this application provides a method for testing the noise of a vehicle's fan and engine, comprising the following steps: acquiring test process data for the fan and engine; controlling test equipment to test the fan and engine according to the test process data, acquiring fan speed data, fan noise data, and engine noise data during the test; generating a first-order noise curve for the fan based on the fan speed data and fan noise data, calculating second-order noise values ​​for the engine at different speeds based on the engine noise data, and identifying the flapping noise of the fan and engine based on the first-order noise curve for the fan and the second-order noise values ​​for the engine.

[0006] Optionally, in one embodiment of this application, before acquiring the test process data of the fan and engine, the method further includes: arranging a sound sensor and a speed sensor, wherein the sound sensor is used to collect engine noise data and the speed sensor is used to collect fan speed data; and connecting the test equipment to the fan and engine respectively, wherein the test equipment is used to drive the fan and engine to work.

[0007] Optionally, in one embodiment of this application, the sound sensor is positioned at the driver's inner ear location in the vehicle.

[0008] Optionally, in one embodiment of this application, the test process corresponding to the test process data includes: controlling the test equipment to drive the engine to work based on a pre-set first test command, controlling the engine speed at multiple idle speed positions of the engine, working at each idle speed position for a preset time, and collecting engine noise at different speeds, generating engine noise data and fan noise data based on the engine noise at different speeds; after identifying that the test at multiple idle speed positions is completed, controlling the test equipment to drive the engine to shut down based on a pre-set second test command, controlling the test equipment to drive the fan from the lowest speed to the highest speed based on a pre-set third test command, and controlling the fan speed increase rate to be lower than a preset rate, and collecting fan speed data.

[0009] Optionally, in one embodiment of this application, generating a first-order noise curve for a fan based on fan speed data and fan noise data includes: determining the noise at different fan speeds based on the fan speed data and fan noise data; calculating the first-order noise amplitude of the fan at different fan speeds based on the noise at different fan speeds; and generating a first-order noise curve for the fan based on the first-order noise amplitude of the fan at different fan speeds.

[0010] Optionally, in one embodiment of this application, generating a first-order noise curve of a fan based on the first-order noise amplitude of the fan at different fan speeds includes: establishing a coordinate axis with fan speed as the horizontal axis and fan first-order noise amplitude as the vertical axis; determining the coordinate points corresponding to the first-order noise amplitude of the fan at different fan speeds on the coordinate axis; and generating a first-order noise curve of the fan based on the coordinate points.

[0011] Optionally, in one embodiment of this application, identifying the flapping noise of the fan and engine based on the fan's first-order noise curve and the engine's second-order noise value includes: determining a first target speed from the fan's first-order noise curve based on a first preset noise, wherein the fan's first-order noise corresponding to the first target speed is greater than the first preset noise; determining a second target speed from the engine speed based on the engine's second-order noise value and a second preset noise, wherein the engine's second-order noise value corresponding to the second target speed is greater than the second preset noise; calculating the speed ratio and speed difference between the first target speed and the second target speed, and identifying the flapping noise of the fan and engine based on the speed ratio and speed difference.

[0012] A second aspect of this application provides a vehicle fan and engine noise testing device, comprising: an acquisition module for acquiring test process data of the fan and engine; a testing module for controlling the testing equipment to test the fan and engine according to the test process data, and acquiring fan speed data, fan noise data and engine noise data during the test; and an identification module for generating a first-order fan noise curve based on the fan speed data and fan noise data, calculating the second-order engine noise value at different speeds based on the engine noise data, and identifying the fan and engine vibration noise based on the first-order fan noise curve and the second-order engine noise value.

[0013] Optionally, in one embodiment of this application, it further includes: an acquisition module, used to arrange a sound sensor and a speed sensor before acquiring test process data of the fan and engine, wherein the sound sensor is used to collect engine noise data and the speed sensor is used to collect fan speed data; and the test equipment is connected to the fan and engine respectively, and the test equipment is used to drive the fan and engine to work.

[0014] Optionally, in one embodiment of this application, the sound sensor is positioned at the driver's inner ear location in the vehicle.

[0015] Optionally, in one embodiment of this application, the testing module is further configured to control the testing equipment to drive the engine to work based on a pre-set first test command, control the engine speed at multiple idle speed positions, work at each idle speed position for a preset duration, and collect engine noise at different speeds, and generate engine noise data and fan noise data based on the engine noise at different speeds; after the test at multiple idle speed positions is completed, the testing equipment is controlled to shut down the engine based on a pre-set second test command, and the testing equipment is controlled to drive the fan from the lowest speed to the highest speed based on a pre-set third test command, and the fan speed increase rate is controlled to be lower than a preset rate, and fan speed data is collected.

[0016] Optionally, in one embodiment of this application, the identification module is further configured to determine the noise at different fan speeds based on fan speed data and fan noise data; calculate the first-order noise amplitude of the fan at different fan speeds based on the noise at different fan speeds; and generate a first-order noise curve of the fan based on the first-order noise amplitude of the fan at different fan speeds.

[0017] Optionally, in one embodiment of this application, the identification module is further configured to establish a coordinate axis with fan speed as the horizontal axis and fan first-order noise amplitude as the vertical axis; on the coordinate axis, determine the coordinate points corresponding to the fan first-order noise amplitude at different fan speeds, and generate a fan first-order noise curve based on the coordinate points.

[0018] Optionally, in one embodiment of this application, the identification module is further configured to determine a first target speed from the first-order noise curve of the fan based on a first preset noise, wherein the first-order noise of the fan corresponding to the first target speed is greater than the first preset noise; determine a second target speed from the engine speed based on the second-order noise value of the engine and the second preset noise, wherein the second-order noise value of the engine corresponding to the second target speed is greater than the second preset noise; calculate the speed ratio and speed difference between the first target speed and the second target speed, and identify the flapping noise of the fan and the engine based on the speed ratio and speed difference.

[0019] A third aspect of this application provides a vehicle, including a fan and an engine, wherein the vibration noise of the fan and engine is obtained based on the above-described vehicle fan and engine noise test method.

[0020] A fourth aspect of this application provides a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement a method for testing the fan and engine noise of a vehicle as described in the above embodiments.

[0021] Therefore, this application has the following beneficial effects: First, test process data for the fan and engine is acquired, including the engine's operating status at different idle speeds and the fan's operation at different speeds. This provides complete reference information for subsequent precise control of the test equipment, ensuring that the test covers the entire operating range of the fan and engine. Second, the test equipment is controlled according to the test process data to test the fan and engine, collecting fan speed data, fan noise data, and engine noise data in real time. Idle noise characteristics are acquired when the engine is running alone, and the speed-noise response is recorded when the fan is running alone, thus eliminating environmental and operating condition interference and obtaining stable and repeatable noise data. Then, a first-order noise curve for the fan is generated based on the fan speed data and fan noise data. Simultaneously, the second-order noise value of the engine at different speeds is calculated by analyzing the engine noise data. By combining the first-order noise curve of the fan and the second-order noise value of the engine, this application can accurately identify the conditions that generate flapping noise between the fan and engine, achieving a quantitative judgment of the occurrence of flapping noise. This covers the entire fan operating speed range and eliminates environmental interference, improving the comprehensiveness, stability, and repeatability of the vehicle flapping noise test. This solves the problems of incomplete testing and instability due to environmental interference when testing the vibration noise of vehicle fans and engines.

[0022] 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

[0023] 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 a method for testing the fan and engine noise of a vehicle according to an embodiment of this application; Figure 2 This is an example diagram of a vehicle fan and engine noise testing apparatus according to an embodiment of this application; Figure 3 This is a structural schematic diagram of a vehicle according to an embodiment of this application. Detailed Implementation

[0024] The embodiments of this application are described in detail below. Examples of the 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.

[0025] The following description, with reference to the accompanying drawings, outlines a method, apparatus, vehicle, and medium for testing fan and engine noise in a vehicle according to embodiments of this application. Addressing the problems mentioned in the background section, this application provides a method for testing fan and engine noise in a vehicle. In this method, firstly, test process data for the fan and engine is acquired, including the engine's operating state at different idle speeds and the fan's operation at different speeds, providing complete reference information for subsequent precise control of the testing equipment, thereby ensuring that the test covers the entire operating range of the fan and engine. Secondly, the testing equipment is controlled according to the test process data to test the fan and engine, collecting fan speed data, fan noise data, and engine noise data in real time. Idle noise characteristics are obtained when the engine is running alone. By recording the fan's speed-noise response during standalone operation, environmental and operating condition interference is eliminated, resulting in stable and repeatable noise data. Then, a first-order noise curve for the fan is generated based on the fan speed and noise data. Simultaneously, engine noise data is analyzed to calculate the second-order engine noise values ​​at different speeds. By combining the first-order fan noise curve and the second-order engine noise values, this application can accurately identify the conditions that generate flapping noise between the fan and engine, achieving a quantitative judgment of the occurrence of flapping noise. This covers the entire fan operating speed range and eliminates environmental interference, improving the comprehensiveness, stability, and repeatability of vehicle flapping noise testing. Therefore, it solves the problems of incomplete testing and instability due to environmental interference in related technologies when testing vehicle fan and engine flapping noise.

[0026] Specifically, Figure 1 This is a flowchart illustrating a method for testing the fan and engine noise of a vehicle, as provided in an embodiment of this application.

[0027] like Figure 1 As shown, the test method for the vehicle's fan and engine noise includes the following steps: In step S101, test process data for the fan and engine are acquired.

[0028] It is understood that the test process data is a set of control commands involved in the entire test process. The test process is implemented based on the set of control commands. In this application, it is a pre-set sequence of engine and fan control commands. The entire test process is implemented through the sequence of engine and fan control commands.

[0029] In one embodiment of this application, before acquiring the test process data of the fan and engine, the method further includes: arranging a sound sensor and a speed sensor, wherein the sound sensor is used to collect engine noise data and the speed sensor is used to collect fan speed data; and connecting the test equipment to the fan and engine respectively, wherein the test equipment is used to drive the fan and engine to work.

[0030] Among them, the sound sensor is a device for collecting noise, and in this application, it is a miniature microphone placed in the driver's inner ear; the speed sensor is a device for collecting speed, and in this application, it is a sensor mounted on the fan shaft to obtain real-time speed data (r / min) of the fan; the testing equipment is a device for driving the fan and engine and collecting data.

[0031] Understandably, setting up sound and speed sensors and connecting the test equipment to the fan and engine respectively ensures accurate data acquisition before formal testing, guarantees that the noise and speed data of the fan and engine can be recorded synchronously and completely, and provides a reliable foundation for subsequent generation of the fan's first-order noise curve, calculation of the engine's second-order noise value, and identification of vibration noise.

[0032] In one embodiment of this application, before testing the fan and engine, a sound sensor is first placed at the inner ear of the vehicle driver to collect noise sound pressure, and a speed sensor is installed on the fan to obtain fan speed data in real time; then, the fan speed sensor and the speed control devices for the engine and fan are respectively connected to the test system.

[0033] In one embodiment of this application, a sound sensor is positioned at the driver's inner ear location in the vehicle.

[0034] Understandably, placing the sound sensor at the driver's inner ear position is to simulate the noise environment the driver actually experiences. Engines and fans produce noise of different frequencies and amplitudes at different speeds. Testing in the vehicle's full-load condition can capture the superposition of first-order fan noise and second-order engine noise inside the vehicle, thereby identifying vibration noise and eliminating the influence of external environmental interference (such as wind noise and road noise) on the measurement results.

[0035] The engine speed data refers to the actual speed information of the vehicle engine during the test process, which in this application is the engine speed value (r / min) collected or recorded by the control equipment.

[0036] In step S102, the test equipment is controlled according to the test process data to test the fan and engine, and the fan speed data, fan noise data and engine noise data are obtained during the test.

[0037] Among them, the fan speed data is the actual speed information of the vehicle fan during the test; the engine noise data is the noise information generated by the engine at each speed; and the fan noise data is the noise information generated by the fan at each speed.

[0038] It is understood that the embodiments of this application can control the test equipment to test the fan and engine according to the test process data, and collect fan speed data, fan noise data and engine noise data during the test.

[0039] For example, the test procedure data pre-specifies that the fan speed should gradually increase from 800 rpm to 3000 rpm, with each increment lasting 10 seconds, while the engine operates synchronously within the corresponding 1000 rpm-3000 rpm range. The test equipment automatically adjusts the actual speeds of the fan and engine according to this procedure, and after each stage stabilizes, it synchronously collects the noise signal output by the sound sensor and the fan speed output by the speed sensor, thereby obtaining fan speed data, fan noise data, and engine noise data.

[0040] In one embodiment of this application, the test process corresponding to the test process data includes: controlling the test equipment to drive the engine to work based on a pre-set first test command, controlling the engine speed at multiple idle speed positions, working at each idle speed position for a preset time, and collecting engine noise at different speeds, generating engine noise data and fan noise data based on the engine noise at different speeds; after identifying that the test at multiple idle speed positions is completed, controlling the test equipment to drive the engine to shut down based on a pre-set second test command, controlling the test equipment to drive the fan from the lowest speed to the highest speed based on a pre-set third test command, and controlling the fan speed increase rate to be lower than a preset rate, and collecting fan speed data.

[0041] The first test command is used to control the engine to operate sequentially at multiple idle speed positions and maintain each speed for a preset duration in order to collect the corresponding engine noise; idle speed is the lowest stable speed at which the engine can maintain self-sustaining operation without external load or driving demand; the second test command is used to control the engine to stop running, so as to put the engine in a shutdown state to eliminate engine noise interference; the third test command is used to control the fan to smoothly increase from the lowest speed to the highest speed and limit the rate of increase; the preset rate is a threshold that limits the speed increase of the fan speed.

[0042] It is understood that the embodiments of this application can ensure that engine noise data and fan noise data are collected under controlled and repeatable operating conditions through a phased and instruction-based testing process, so that the two will not interfere with each other. At the same time, the engine noise collection at multiple idling points can form a complete engine noise characteristic distribution, which can more accurately identify the engine's second-order noise. The independent fan speed-up test after the engine is turned off ensures that the fan speed change is controllable and the data is continuous, which facilitates the acquisition of a high-precision fan first-order noise curve.

[0043] In one embodiment of this application, firstly, based on a first test command, a test device capable of precisely controlling engine speed is used to enable the engine to operate independently without driving the fan, and the engine speed is sequentially and stably controlled at multiple preset idle speed points within the idle speed range (e.g., ...). , , The speed interval between adjacent speed points is set at 50 r / min to form a multi-condition test sequence covering the entire idle speed range. During the stable operation at each idle speed point, the noise sound pressure of the corresponding condition is collected by a sound sensor placed at the driver's inner ear, thereby forming the basic record of engine noise data and fan noise data for subsequent processing.

[0044] Subsequently, after the multi-idle condition test was completed, the test equipment was controlled to shut down the engine based on the second test command to ensure that the subsequent fan test was not affected by engine noise. Next, based on the third test command, the test equipment was controlled to drive the fan to smoothly increase from the lowest speed to the highest speed, and the rate of increase of the fan speed was limited to not exceeding a preset rate threshold (e.g., 100 r / min per second). This preset rate serves as a threshold to limit the rate of increase, preventing sudden changes in fan speed that could cause noise pulses or distortion. Throughout the fan speed increase process, the real-time fan speed and the noise sound pressure collected by the driver's inner ear position sound sensor were recorded to obtain a complete data sequence for constructing the fan speed-noise response relationship. This provides a reliable basis for subsequent noise source differentiation, generation of the fan's first-order noise curve, and identification of fan and engine vibration noise.

[0045] In step S103, a first-order noise curve of the fan is generated based on the fan speed data and fan noise data, and the second-order noise value of the engine at different speeds is calculated based on the engine noise data. The flapping noise between the fan and the engine is identified based on the first-order noise curve of the fan and the second-order noise value of the engine.

[0046] Among them, the first-order noise curve of the fan is a function describing the variation of the amplitude of the first-order characteristic noise generated by the fan at different speeds with the speed. In this application, it is a curve calculated based on the fan speed data and fan noise data, with the speed as the horizontal axis and the noise amplitude as the vertical axis. The second-order noise value of the engine is a quantitative parameter characterizing the intensity of the second-order characteristic noise of the engine at different speeds. The beat noise is the periodic interactive modulation noise generated when there is a specific speed difference or speed ratio relationship between two rotating parts.

[0047] Understandably, by identifying flapping noise based on the fan's first-order noise curve and the engine's second-order noise value, it is possible to accurately determine whether the fan and engine will produce flapping noise directly from controllable and repeatable static test data without repeatedly constructing complex road conditions or relying on high-temperature and high-heat environments, and to quantify the strength relationship and interaction conditions of the two types of noise sources.

[0048] In one embodiment of this application, generating a first-order noise curve for a fan based on fan speed data and fan noise data includes: determining the noise at different fan speeds based on the fan speed data and fan noise data; calculating the first-order noise amplitude of the fan at different fan speeds based on the noise at different fan speeds; and generating a first-order noise curve for the fan based on the first-order noise amplitude of the fan at different fan speeds.

[0049] The first-order noise amplitude of the fan is the noise amplitude of the dominant frequency corresponding to a specific fan speed. In this application, it is the first-order harmonic sound pressure level corresponding to the fan speed calculated by frequency domain analysis.

[0050] Understandably, generating the first-order noise curve of the fan can accurately depict the dominant noise amplitude of the fan at various speeds, directly revealing the law of fan noise change with speed. By establishing the correspondence between fan speed and first-order noise amplitude, it also provides an accurate data basis for frequency coupling analysis with engine second-order noise.

[0051] For example, the fan of a hybrid vehicle recorded noise amplitudes of 28 dB(A), 32 dB(A), 38 dB(A), and 35 dB(A) at four speed points: 800 r / min, 1200 r / min, 1600 r / min, and 2000 r / min, respectively. By plotting the fan speed on the horizontal axis and the noise amplitude on the vertical axis, it can be seen that the fan noise amplitude reaches a peak of 38 dB(A) near 1600 r / min. This speed range may have near-frequency coupling with the engine's second-order idle noise, thus posing a potential risk of beat vibration. Based on this first-order fan noise curve, it can be further compared with the engine's second-order noise data to identify the specific speed combinations that cause beat vibration and formulate corresponding noise control or speed regulation strategies.

[0052] In one embodiment of this application, generating a first-order noise curve of a fan based on the first-order noise amplitude of the fan at different fan speeds includes: establishing a coordinate axis with fan speed as the horizontal axis and fan first-order noise amplitude as the vertical axis; determining the coordinate points corresponding to the first-order noise amplitude of the fan at different fan speeds on the coordinate axis; and generating a first-order noise curve of the fan based on the coordinate points.

[0053] Understandably, by establishing a coordinate axis with fan speed as the horizontal axis and first-order noise amplitude as the vertical axis, and marking each coordinate point to generate a first-order noise curve for the fan, the noise characteristics of the fan can be intuitively displayed throughout the entire speed range, which helps to quickly identify noise peaks and abnormal speed ranges.

[0054] In one embodiment of this application, identifying the flapping noise of the fan and engine based on the fan's first-order noise curve and the engine's second-order noise value includes: determining a first target speed from the fan's first-order noise curve based on a first preset noise, wherein the fan's first-order noise corresponding to the first target speed is greater than the first preset noise; determining a second target speed from the engine speed based on the engine's second-order noise value and a second preset noise, wherein the engine's second-order noise value corresponding to the second target speed is greater than the second preset noise; calculating the speed ratio and speed difference between the first target speed and the second target speed, and identifying the flapping noise of the fan and engine based on the speed ratio and speed difference.

[0055] The first target speed is the fan speed selected from the first-order noise curve of the fan, whose corresponding noise amplitude is greater than the first preset noise; the second target speed is the engine speed selected from the second-order noise value of the engine, whose corresponding noise amplitude is greater than the second preset noise; the speed multiplier is the ratio of the first target speed to the second target speed, used to measure the integer multiple relationship between the fan and engine speeds; the speed difference is the absolute value of the difference between the first target speed and the second target speed.

[0056] Understandably, this application can accurately identify potential vibration noise sources under fan and engine operating conditions. By comparing the first-order noise curve of the fan with the second-order noise value of the engine, and combining the speed ratio and speed difference, the conditions for vibration occurrence are determined, thereby achieving effective separation and coupling analysis of fan and engine noise sources.

[0057] Based on the recorded fan speed and noise sound pressure data, this application first performs frequency domain analysis on the noise sound pressure at different fan speeds, extracts the first-order noise amplitude at the corresponding speed, and plots a complete first-order fan noise curve with fan speed as the horizontal axis and fan first-order noise amplitude as the vertical axis. Simultaneously, it analyzes the engine's... , , The noise sound pressure collected at multiple idling speed points is decomposed, and the second-order noise amplitude of the engine corresponding to each speed is calculated, thereby obtaining the second-order noise dataset of the engine idling range.

[0058] After obtaining the first-order noise curve of the fan and the second-order noise value of the engine, the vibration noise is judged based on the coupling relationship between noise intensity and speed: First, the first target speed is determined from the first-order noise curve of the fan, that is, the speed point where the amplitude of the first-order noise of the fan is greater than the first preset noise threshold, assuming that the first target speed is 1200 r / min; Second, the second target speed is determined from the engine speed according to the second-order noise value of the engine and the second preset noise threshold, assuming that the second target speed is 750 r / min.

[0059] Next, the speed ratio is calculated, which is the ratio of the first target speed to the second target speed, and in this embodiment, it is 1200 ÷ 750 ≈ 1.6; the speed difference is calculated, which is the difference between the first target speed and twice the engine speed, and in this example, it is |1200|. 2×750| = 300 r / min. When the first-order noise amplitude of the fan is greater than 30 dB, the second-order noise amplitude of the engine is greater than 30 dB, and the speed difference is less than 600 r / min, it indicates that the dominant frequencies of the fan and the engine are close to each other and have sufficient acoustic energy to meet the intensity and frequency coupling conditions for beat vibration. At this time, it can be determined that the fan and the engine will produce obvious beat vibration noise.

[0060] According to the vehicle fan and engine noise testing method proposed in this application, firstly, test process data for the fan and engine is acquired, including the engine's operating state at different idle speeds and the fan's operation at different speeds, providing complete reference information for subsequent precise control of the testing equipment, thereby ensuring that the test covers the entire operating range of the fan and engine; secondly, the testing equipment is controlled according to the test process data to test the fan and engine, collecting fan speed data, fan noise data, and engine noise data in real time. Idle noise characteristics are acquired when the engine is running alone, and the speed-noise response is recorded when the fan is running alone, thereby eliminating environmental and operating condition interference and obtaining stable and repeatable noise data; then, a first-order noise curve for the fan is generated based on the fan speed data and fan noise data, while simultaneously analyzing and calculating the second-order noise value of the engine at different speeds. By combining the first-order noise curve of the fan and the second-order noise value of the engine, this application can accurately identify the conditions for the generation of flapping noise between the fan and engine, achieving a quantitative judgment of the occurrence of flapping noise, thereby covering the entire fan operating speed range and eliminating environmental interference, improving the comprehensiveness, stability, and repeatability of the vehicle flapping noise test. This solves the problems of incomplete testing and instability due to environmental interference when testing the vibration noise of vehicle fans and engines.

[0061] Next, referring to the accompanying drawings, a vehicle fan and engine noise testing device according to an embodiment of this application is described.

[0062] Figure 2 This is a block diagram of a vehicle fan and engine noise testing device according to an embodiment of this application.

[0063] like Figure 2 As shown, the vehicle's fan and engine noise testing device 10 includes: an acquisition module 100, a testing module 200, and an identification module 300.

[0064] The module 100 is used to acquire test process data of the fan and engine; the test module 200 is used to control the test equipment to test the fan and engine according to the test process data, and acquire fan speed data, fan noise data and engine noise data during the test; the identification module 300 is used to generate a first-order noise curve of the fan based on the fan speed data and fan noise data, calculate the second-order noise value of the engine at different speeds based on the engine noise data, and identify the flapping noise of the fan and engine based on the first-order noise curve of the fan and the second-order noise value of the engine.

[0065] In one embodiment of this application, it further includes: a placement module, used to place a sound sensor and a speed sensor before acquiring test process data of the fan and engine, wherein the sound sensor is used to collect engine noise data and the speed sensor is used to collect fan speed data; and the test equipment is connected to the fan and engine respectively, and the test equipment is used to drive the fan and engine to work.

[0066] In one embodiment of this application, a sound sensor is positioned at the driver's inner ear location in the vehicle.

[0067] In one embodiment of this application, the test module 200 is further configured to control the test equipment to drive the engine to work based on a pre-set first test command, control the engine speed at multiple idle speed positions of the engine, work at each idle speed position for a preset duration, and collect engine noise at different speeds, and generate engine noise data and fan noise data based on the engine noise at different speeds; after the test at multiple idle speed positions is completed, the test equipment is controlled to shut down the engine based on a pre-set second test command, and the test equipment is controlled to drive the fan from the lowest speed to the highest speed based on a pre-set third test command, and the fan speed increase rate is controlled to be lower than a preset rate, and fan speed data is collected.

[0068] In one embodiment of this application, the identification module 300 is further configured to determine the noise at different fan speeds based on fan speed data and fan noise data; calculate the first-order noise amplitude of the fan at different fan speeds based on the noise at different fan speeds; and generate a first-order noise curve of the fan based on the first-order noise amplitude of the fan at different fan speeds.

[0069] In one embodiment of this application, the identification module 300 is further configured to establish a coordinate axis with fan speed as the horizontal axis and fan first-order noise amplitude as the vertical axis; on the coordinate axis, determine the coordinate points corresponding to the fan first-order noise amplitude at different fan speeds, and generate a fan first-order noise curve based on the coordinate points.

[0070] In one embodiment of this application, the identification module 300 is further configured to determine a first target speed from the first-order noise curve of the fan based on a first preset noise, wherein the first-order noise of the fan corresponding to the first target speed is greater than the first preset noise; determine a second target speed from the engine speed based on the second-order noise value of the engine and the second preset noise, wherein the second-order noise value of the engine corresponding to the second target speed is greater than the second preset noise; calculate the speed ratio and speed difference between the first target speed and the second target speed, and identify the flapping noise of the fan and the engine based on the speed ratio and speed difference.

[0071] It should be noted that the foregoing explanation of the vehicle fan and engine noise testing method embodiment also applies to the vehicle fan and engine noise testing device of this embodiment, and will not be repeated here.

[0072] According to the vehicle fan and engine noise testing device proposed in this application, firstly, test process data of the fan and engine are acquired, including the working state of the engine at different idle speeds and the operation of the fan at different speeds, providing complete reference information for subsequent precise control of the testing equipment, thereby ensuring that the test covers the entire working range of the fan and engine; secondly, the testing equipment is controlled to test the fan and engine according to the test process data, and fan speed data, fan noise data, and engine noise data are collected in real time. When the engine is running alone, its idle noise characteristics are acquired, and when the fan is running alone, its speed-noise response is recorded, thereby eliminating environmental and operating condition interference and obtaining stable and repeatable noise data; then, a first-order noise curve of the fan is generated based on the fan speed data and fan noise data, and the second-order noise value of the engine at different speeds is calculated by analyzing the engine noise data. By combining the first-order noise curve of the fan and the second-order noise value of the engine, this application can accurately identify the conditions for the generation of flapping noise between the fan and the engine, realize the quantitative judgment of the occurrence of flapping noise, thereby covering the entire fan working speed range and eliminating environmental interference, improving the comprehensiveness, stability, and repeatability of the vehicle flapping noise test. This solves the problems of incomplete testing and instability due to environmental interference when testing the vibration noise of vehicle fans and engines.

[0073] This application also provides a vehicle. Figure 3 The diagram below shows the structure of a vehicle provided in this application embodiment. The vehicle includes a fan 301 and an engine 302. The vibration noise of the fan 301 and the engine 302 is obtained based on the above-described vehicle fan and engine noise test method.

[0074] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for testing the fan and engine noise of a vehicle.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are 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.

[0076] 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.

[0077] 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.

[0078] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any of the following techniques known in the art, or a combination thereof: 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 (FPGAs), field-programmable gate arrays (FPGAs), etc.

[0079] Those skilled in the art will understand that all or part of the steps of the methods implementing 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.

[0080] 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 of fan and engine noise testing of a vehicle, characterized by, Includes the following steps: Obtain test process data for the fan and engine; According to the test procedure, the test equipment is controlled to test the fan and the engine, and the fan speed data, fan noise data and engine noise data are obtained during the test. A first-order noise curve for the fan is generated based on the fan speed data and the fan noise data. The second-order noise value of the engine at different speeds is calculated based on the engine noise data. The flapping noise between the fan and the engine is identified based on the first-order noise curve for the fan and the second-order noise value of the engine.

2. The method of fan and engine noise testing of a vehicle of claim 1, wherein, Before obtaining the test process data for the fan and engine, the following is also included: A sound sensor and a speed sensor are arranged, wherein the sound sensor is used to collect engine noise data, and the speed sensor is used to collect fan speed data; The testing equipment is connected to the fan and the engine respectively, and the testing equipment is used to drive the fan and the engine to work.

3. The method of fan and engine noise testing of a vehicle of claim 2, wherein, The sound sensor is positioned at the driver's inner ear location in the vehicle.

4. The method of fan and engine noise testing of a vehicle of claim 1, wherein, The test process corresponding to the test process data includes: Based on a pre-set first test command, the test equipment is controlled to drive the engine to work, and the engine speed is controlled at multiple idle speed positions. The engine works at each idle speed position for a preset time, and the engine noise at different speeds is collected. Based on the engine noise at different speeds, the engine noise data and the fan noise data are generated. After multiple idle speed positions are identified and the tests are completed, the test equipment is controlled to shut off the engine based on a pre-set second test command, and the test equipment is controlled to drive the fan from the lowest speed to the highest speed based on a pre-set third test command, while controlling the fan speed increase rate to be lower than the preset rate, and fan speed data is collected.

5. The method of fan and engine noise testing of a vehicle of claim 1, wherein, The step of generating a first-order noise curve for the fan based on the fan speed data and the fan noise data includes: The noise level at different fan speeds is determined based on the fan speed data and the fan noise data. Calculate the first-order noise amplitude of the fan at different fan speeds based on the noise levels at different fan speeds. The first-order noise curve of the fan is generated based on the first-order noise amplitude of the fan at different fan speeds.

6. The method of fan and engine noise testing of a vehicle of claim 5, wherein, The process of generating the first-order noise curve of the fan based on the first-order noise amplitude of the fan at different fan speeds includes: Establish a coordinate axis with fan speed as the horizontal axis and the first-order noise amplitude of the fan as the vertical axis; On the coordinate axis, determine the coordinate points corresponding to the first-order noise amplitude of the fan at different fan speeds, and generate the first-order noise curve of the fan based on the coordinate points.

7. The method of fan and engine noise testing of a vehicle of claim 1, wherein, The step of identifying the flapping noise of the fan and the engine based on the first-order noise curve of the fan and the second-order noise value of the engine includes: A first target speed is determined from the first-order noise curve of the fan based on a first preset noise, wherein the first-order noise of the fan corresponding to the first target speed is greater than the first preset noise; A second target speed is determined from the engine speed based on the engine second-order noise value and the second preset noise, wherein the engine second-order noise value corresponding to the second target speed is greater than the second preset noise. A rotation speed ratio and a rotation speed difference of the first target rotation speed and the second target rotation speed are calculated, and a beat noise of the fan and the engine is identified according to the rotation speed ratio and the rotation speed difference.

8. A fan-to-engine noise testing apparatus for a vehicle, characterized by, The method comprises: An acquisition module is configured to acquire test flow data of a fan and an engine; A test module is configured to control a test device to test the fan and the engine according to the test flow data, and acquire fan rotation speed data, fan noise data, and engine noise data during the test; An identification module is configured to generate a fan first-order noise curve according to the fan rotation speed data and the fan noise data, calculate engine second-order noise values at different rotation speeds according to the engine noise data, and identify a beat noise of the fan and the engine according to the fan first-order noise curve and the engine second-order noise values.

9. A vehicle characterized by comprising: The vehicle comprises a fan and an engine, and a beat noise of the fan and the engine is tested by the fan and engine noise test method of the vehicle according to any one of claims 1-7.

10. A computer readable storage medium having stored thereon a computer program or instructions, characterized in that, The computer program or instructions are executed to implement the fan and engine noise test method of the vehicle according to any one of claims 1-7.

Images