In-vehicle noise comfort test method based on multi-dimensional indexes

Abstract

The invention provides an in-vehicle noise comfort test method based on a multi-dimensional index, and belongs to the technical field of acoustic test and evaluation, the method is suitable for manual-shift and automatic-shift vehicles, and under the vehicle acceleration operation condition, when a preset acceleration condition is met, the in-vehicle noise comfort test is carried out. The maximum value of the A-weighted sound pressure level, the loudness value and the sharpness value of the preset noise measuring point position can be measured and recorded, multiple times of measurement are completed before the rotating speed of the engine reaches 90% of the rated rotating speed, and the arithmetic mean value is calculated to serve as an intermediate result. For a constant-speed operation condition, the A weighting sound pressure level and the loudness value are measured and recorded for multiple times, and an arithmetic mean value is calculated as an intermediate result; according to the method, the two psychoacoustic parameters including the loudness and the sharpness are introduced to serve as indexes for evaluating the comfort performance of the noise in the vehicle, and the actual perception and subjective experience of human ears on the noise can be reflected more accurately.

Description

Technical Field

[0001] The present invention relates to the technical field of acoustic testing and evaluation, and in particular to a method for testing in-vehicle noise comfort based on multi-dimensional indicators. Background Art

[0002] With the development of the automobile industry, consumers have increasingly higher requirements for in-car comfort, among which the in-car noise level is one of the important indicators for measuring comfort. At present, the industry's in-car noise test mainly relies on the single physical quantity of sound pressure level (usually expressed in dB(A)) for evaluation. Sound pressure level is an objective physical quantity that measures the strength of sound, and it reflects the degree of pressure change of sound in the air.

[0003] However, in practical applications, using only sound pressure level as an indicator for evaluating in-vehicle noise has certain limitations. Although the sound pressure level can objectively describe the intensity of the sound, it cannot fully reflect the passengers' subjective feelings about the noise. For example, noise of certain frequencies may cause greater disturbance and discomfort to passengers, while the performance of noise of these frequencies in terms of sound pressure level may not be prominent.

[0004] In addition, the sources of in-car noise are diverse, including engine noise, wind noise, road noise, etc. These noises have different characteristics and properties, and their impact on passengers is also different. Therefore, using only sound pressure level as an evaluation indicator cannot accurately distinguish the degree of impact of noise from different sources on passengers, nor can it effectively evaluate the actual effects of various noise reduction measures.

[0005] In summary, the existing in-vehicle noise evaluation methods are too simple and cannot fully and accurately reflect passengers' subjective feelings about noise. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention proposes a vehicle interior noise comfort testing method based on multi-dimensional indicators to solve the technical problems existing in the prior art.

[0007] The technical solution adopted by the present invention is:

[0008] A first aspect of the present embodiment provides a method for testing vehicle interior noise comfort based on multi-dimensional indicators, the method comprising:

[0009] When the acceleration running condition of the manual transmission vehicle meets the first preset acceleration condition, measure and record the maximum value of the "A" weighted sound pressure level, loudness value and sharpness value of the measured noise at each preset noise measuring point within the preset measurement time range, complete N measurements before the engine speed reaches 90% of the rated speed specified by the manufacturer, and take the arithmetic mean of the N measurement data of each preset noise measuring point as the "A" weighted sound pressure level, loudness value and sharpness value measured at each preset noise measuring point;

[0010] When the acceleration running condition of the automatic transmission vehicle meets the second preset acceleration condition, measure and record the maximum value of the "A" weighted sound pressure level, loudness value and sharpness value of the measured noise at each preset noise measuring point within the preset measurement time range, complete N measurements before the engine speed reaches 90% of the rated speed specified by the manufacturer, and take the arithmetic mean of the N measurement data of each preset noise measuring point as the "A" weighted sound pressure level, loudness value and sharpness value measured at each preset noise measuring point;

[0011] When the uniform speed operating condition of a manual transmission vehicle or an automatic transmission vehicle meets its corresponding preset uniform speed operating condition, measure and record the "A" weighted sound pressure level and loudness value of the measured noise at each preset noise measuring point within the preset measurement time range, complete N measurements, and take the arithmetic mean of the N measurement data of each preset noise measuring point as the "A" weighted sound pressure level and loudness value measured at each preset noise measuring point.

[0012] Furthermore, the first preset acceleration condition is: when the vehicle speed stably reaches 15 km / h in gear II and the accelerator pedal is fully depressed;

[0013] The second preset acceleration condition is: when the shift device is in the D gear or the gear specified by the vehicle manufacturer, the accelerator pedal is fully depressed and the vehicle speed range is between 10km / h and 50km / h;

[0014] The preset uniform speed operating condition is: for a vehicle with a maximum speed of not less than 100 km / h, the preset uniform speed operating condition is when the vehicle is traveling at a uniform speed of 90 km / h; for a vehicle with a maximum speed of less than 100 km / h, the preset uniform speed operating condition is when the vehicle is traveling at a uniform speed of 80% of the maximum speed.

[0015] Furthermore, the preset noise measurement point position includes:

[0016] The right ear side of the driver's seat, the left ear side of the front passenger seat, the right ear side of the left rear seat, and the left ear side of the right rear seat.

[0017] Furthermore, the vertical coordinate of the noise measuring point is set at (0.70±0.05) m above the intersection of the seat surface and the backrest surface, and the horizontal coordinate is set at (0.20±0.02) m from the center plane of the seat.

[0018] Furthermore, before measuring and recording the maximum value of the “A” weighted sound pressure level, loudness value and sharpness value in the measured noise at each preset noise measuring point position within the preset measurement time range, or before measuring and recording the “A” weighted sound pressure level and loudness value in the measured noise at each preset noise measuring point position within the preset measurement time range, the method further comprises:

[0019] Obtain the background noise at each preset noise measurement point;

[0020] The step of obtaining the background noise at each preset noise measurement point includes:

[0021] Acquire noise measurement data of each preset noise measurement point, wherein the continuous measurement time of the noise measurement data is not less than 10s;

[0022] The highest "A" weighted sound pressure level data in the noise measurement data of each preset noise measurement point is used as its corresponding background noise, thereby obtaining the background noise at each preset noise measurement point position.

[0023] Furthermore, the measured noise at each preset noise measurement point is greater than the background noise at the respective preset noise measurement point, and a difference ΔL between the measured noise and the background noise is greater than or equal to 10 dB.

[0024] Further, if the difference ΔL between the measured noise at the preset noise measurement point and the background noise at the preset noise measurement point satisfies 10≤ΔL<11, the background noise at the preset noise measurement point is subtracted by 0.5 dB;

[0025] If the difference ΔL between the measured noise at the preset noise measurement point and the background noise at the preset noise measurement point satisfies 11≤ΔL<12, then the background noise at the preset noise measurement point is subtracted by 0.4dB;

[0026] If the difference ΔL between the measured noise at the preset noise measurement point and the background noise at the preset noise measurement point satisfies 12≤ΔL<13, then the background noise at the preset noise measurement point is subtracted by 0.3dB;

[0027] If the difference ΔL between the measured noise at the preset noise measurement point and the background noise at the preset noise measurement point satisfies 13≤ΔL<14, then the background noise at the preset noise measurement point is subtracted by 0.2dB;

[0028] If the difference ΔL between the measured noise at the preset noise measurement point and the background noise at the preset noise measurement point satisfies 14≤ΔL<15, the background noise at the preset noise measurement point is subtracted by 0.1dB.

[0029] Furthermore, under any operating condition, if the maximum reading difference of the "A" weighted sound pressure level measured N times at the same measuring point exceeds 2dB, the measurement will continue until the maximum reading difference of N consecutive measurements is within 2dB (A).

[0030] Furthermore, before measuring and recording the maximum value of the "A" weighted sound pressure level, loudness value and sharpness value of the measured noise at each preset noise measuring point within the preset measurement time range, or before measuring and recording the "A" weighted sound pressure level and loudness value of the measured noise at each preset noise measuring point within the preset measurement time range, the method further includes performing data processing on the measured noise obtained at each preset noise measuring point within the preset measurement time range, and the data processing includes:

[0031] The loudness value is calculated using the following formula:

[0032] N=∫N′df

[0033]

[0034] Where N is the loudness value, in sones; N′ is the critical band characteristic loudness value, in sones; f is the frequency, in Hertz; s is the correction factor, the constant value is 0.25; L TQ is the minimum perceptual threshold corresponding to the selected critical frequency band; L CB′ is the approximate critical band magnitude;

[0035] The sharpness value is calculated using the following formula:

[0036]

[0037] Among them, S is the sharpness value, the unit is acum; K 2 is the proportional factor, and its value range is 0.105≤K 2 ≤0.115; g(z) is the additional coefficient, which is a function of the critical frequency band; N′(z) is the characteristic loudness value of the critical frequency band; z is the corresponding critical frequency band, in bark.

[0038] In a second aspect of this embodiment, a vehicle interior noise comfort testing system based on multi-dimensional indicators is provided, the system comprising:

[0039] The operating condition recognition module is responsible for identifying the vehicle's operating conditions, including the first preset acceleration condition for manual transmission vehicles, the second preset acceleration condition for automatic transmission vehicles, and the preset uniform speed conditions corresponding to manual transmission and automatic transmission vehicles, and determines whether the preset operating conditions are met based on the current state of the vehicle.

[0040] The noise measurement module is responsible for performing noise measurement at each preset noise measurement point after identifying that the preset working conditions are met, measuring and recording the "A" weighted sound pressure level and loudness value of the measured noise within the preset measurement time range under the uniform speed working condition, or measuring and recording the maximum value of the "A" weighted sound pressure level, loudness value, and sharpness value of the measured noise within the preset measurement time range under the acceleration working condition;

[0041] The data processing module processes the data collected by the noise measurement module and calculates the arithmetic mean of the N measurement data of each preset noise measurement point.

[0042] It can be seen from the above technical solution that the beneficial technical effects of the present invention are as follows:

[0043] 1. The present invention introduces two psychoacoustic parameters, loudness and sharpness, and combines them with the traditional "A" weighted sound pressure level to form a multi-dimensional index system, which can more comprehensively and accurately reflect the comfort performance of in-vehicle noise. The loudness and sharpness parameters can capture the subjective feeling of the human ear to noise, making the test results closer to the actual driving experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0045] Figure 1 This is a schematic diagram of the measurement position of an embodiment of the present invention;

[0046] Figure 2 Schematic diagram of the positions of the driver and the left rear microphone relative to the seat according to an embodiment of the present invention;

[0047] Figure 3 Schematic diagram of the positions of the front passenger seat and the right rear microphone relative to the seat in an embodiment of the present invention;

[0048] Figure 4 A schematic diagram of a test system according to an embodiment of the present invention;

[0049] Reference numerals:

[0050] 1-Driver's measuring point, 2-Co-pilot's seat measuring point, 3-Left rear row measuring point, 4-Right rear row measuring point, 5-Driver's seat and left rear row measuring point, 6-Co-pilot's seat and right rear row measuring point. DETAILED DESCRIPTION

[0051] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0052] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0053] Example

[0054] This embodiment provides a method for testing in-vehicle noise comfort based on multi-dimensional indicators.

[0055] The working principle of the embodiment is described in detail below:

[0056] (1) Measurement conditions

[0057] a) The test section should be a clean, dry, flat, unfrozen asphalt or cement road surface, and should not have joints, unevenness or similar surface structures; the test section route should be straight.

[0058] b) The wind speed along the measurement route at a height of (1.2±0.05)m should not exceed 5m / s, and the temperature range is 5℃~40℃.

[0059] c) The measured noise at each measuring point should be greater than or equal to the background noise by 10dB(A). When the measured noise differs from the background noise by 10dB(A) to 15dB(A), the corresponding correction value in Table 1 should be subtracted from the reading of the measuring equipment as the measurement result.

[0060] Table 1. Background noise correction values

[0061]

[0062] (2) Measurement method

[0063] 1) Selection of measurement points

[0064] a) The measurement points should be selected at the right ear of the driver, the left ear of the front passenger seat, the right ear of the left rear seat, and the left ear of the right rear seat.

[0065] b) Measurement point indication Error! Reference source not found. During the test, except for the driver's seat, no one should sit in the selected measurement position.

[0066] 2) Microphone arrangement

[0067] a) The vertical coordinate of the microphone arrangement position should be set at (0.70±0.05)m above the intersection of the seat surface and the backrest surface, and the horizontal coordinate should be set at (0.20±0.02)m from the center plane of the seat. Figure 3 shown.

[0068] (3) Vehicle test conditions

[0069] 1) Acceleration driving condition

[0070] For cars with manual transmission, the vehicle should be tested in the operating state with the accelerator pedal fully depressed at a speed of 15 km / h in gear II.

[0071] For cars with automatic transmission (including manual transmission) or without transmission, put the shift device in D gear or the gear specified by the vehicle manufacturer, and quickly press the accelerator pedal fully. The test condition is 10km / h ~ 50km / h.

[0072] 2) Constant speed driving condition

[0073] For vehicles with a maximum speed of not less than 100km / h, the vehicle shall be driven at a constant speed of 90km / h; for vehicles with a maximum speed of less than 100km / h, the vehicle shall be driven at a constant speed of 80% of the designed maximum speed (rounded down to an integer multiple of 5), and the speed shall be controlled within the selected speed ±1km / h. The gear position of manual transmission vehicles shall be in the highest gear.

[0074] (4) Measurement steps

[0075] a) When measuring background noise, the measurement should last at least 10 seconds and ensure that the sound is typical background noise and does not contain any transient interference. The microphone used to measure background noise and its layout position should be consistent with the microphone used during the test and its layout position. Record the highest "A" weighted sound pressure level of each microphone as the background noise at its corresponding position.

[0076] b) For the acceleration condition of a manual transmission, the test is conducted according to the acceleration condition of the manual transmission mentioned above. When the vehicle reaches the stable speed corresponding to the above gear, start the recording device to start recording, and at the same time, fully open the accelerator pedal as quickly as possible until the engine speed reaches 90% of the rated speed specified by the manufacturer, and then stop recording. Within the specified acceleration range, perform 4 measurements on each measuring point. Each measurement should last at least 10 seconds, and record the maximum value of the "A" weighted sound pressure level, loudness and sharpness. The arithmetic mean of the 4 measurement data of each preset noise measurement point is used as the "A" weighted sound pressure level, loudness value and sharpness value measured at each preset noise measurement point.

[0077] c) For the acceleration conditions of vehicles with automatic transmissions (including manual transmissions), the test is conducted according to the acceleration conditions of vehicles with automatic transmissions. When the vehicle reaches the stable speed range corresponding to the above gears, start the recording device to start recording, and at the same time, fully open the accelerator pedal as quickly as possible until the engine speed reaches 90% of the rated speed specified by the manufacturer, and then stop recording. Within the specified acceleration range, measure each measuring point 4 times, and each measurement should last at least 10 seconds. Record the maximum values ​​of the "A" weighted sound pressure level, loudness and sharpness. The arithmetic mean of the 4 measurement data of each preset noise measurement point is taken as the "A" weighted sound pressure level, loudness value and sharpness value measured at each preset noise measurement point.

[0078] d) For manual transmission vehicles or automatic transmission vehicles at uniform speed, the test is carried out at uniform speed, and 4 measurements are carried out at each measuring point, with each measurement lasting at least 10 seconds. The steady-state noise measurement readings are read, and the "A" weighted equivalent sound pressure value and loudness value are recorded. The arithmetic mean of the N measurement data of each preset noise measurement point is taken as the "A" weighted sound pressure level and loudness value measured at each preset noise measurement point;

[0079] e) If the difference between the four measured values ​​of the A-weighted sound pressure level at the same measuring point exceeds 2dB(A) under any operating condition, the test should be continued until the difference between the maximum readings of four consecutive measurements is within 2dB(A). The arithmetic mean of the four measurements is taken as the measurement result.

[0080] (5) Data processing is performed on the measured noise obtained at each preset noise measurement point within a preset measurement time range:

[0081] Psychoacoustic parameter calculation:

[0082] a) Loudness calculation

[0083] In the calculation of loudness, the key parameters include sound pressure level (SPL), frequency response and time response. Sound pressure level measures the intensity of sound, usually in decibels (dB), and is the main indicator of loudness. Frequency response evaluates the loudness at different frequencies and is used to analyze the spectral characteristics of sound. Time response describes the change in loudness of sound at different time points and is used to evaluate the dynamic characteristics of sound. Through the comprehensive analysis of these parameters, the loudness of sound can be accurately calculated.

[0084] The calculation method of loudness is shown in formula (1) and formula (2):

[0085] N=∫N′df (1)

[0086]

[0087] Where:

[0088] N——loudness value, in sone;

[0089] N′——critical band characteristic loudness value, unit is sone;

[0090] f——frequency, in Hertz (Hz);

[0091] s——correction factor, the constant value is 0.25;

[0092] L TQ ——The lowest perceptual threshold corresponding to the selected critical frequency band, the center frequency L of each one-third octave band TQ The values ​​are shown in Table 2;

[0093] L CB′ ——Approximate critical band magnitude, center frequency L of each one-third octave band CB′ See Table 2 for values.

[0094] Table 2. Critical frequency band L TQ , L CB′ value

[0095]

[0096]

[0097] b) Sharpness calculation

[0098] Important parameters in the calculation of sharpness include high frequency components, sharpness index, and spectrum analysis. Sharpness mainly depends on the high frequency components in the sound, and is evaluated by analyzing the loudness of the high frequency band. The sharpness index is an indicator calculated by comparing the high frequency components and the overall loudness. Spectral analysis is used to analyze the high frequency components in the sound spectrum to evaluate sharpness. Through detailed analysis of these parameters, the sharpness of the sound can be accurately evaluated.

[0099] The calculation of sharpness is shown in formula (3) and formula (4):

[0100]

[0101] Where:

[0102] S——sharpness value, unit is acum;

[0103] K 2 ——Proportional factor, the value range is 0.105≤K 2 ≤0.115;

[0104] g(z) – additional coefficient, a function of the critical frequency band;

[0105] N′(z)——critical band characteristic loudness value;

[0106] z——corresponding to the critical frequency band, the unit is bark.

[0107] like Figure 4 As shown, this embodiment provides a vehicle interior noise comfort testing system based on multi-dimensional indicators, and the system includes:

[0108] The operating condition identification module 101 is responsible for identifying the operating condition of the vehicle, including the first preset acceleration condition of a manual transmission vehicle, the second preset acceleration condition of an automatic transmission vehicle, and the preset uniform speed condition corresponding to manual and automatic transmission vehicles, and determines whether the preset operating condition conditions are met based on the current state of the vehicle (such as gear position, throttle opening, vehicle speed, etc.).

[0109] The noise measurement module 102, after identifying that the preset working conditions are met, is responsible for performing noise measurement at each preset noise measurement point position, measuring and recording the "A" weighted sound pressure level and loudness value of the measured noise within the preset measurement time range under the uniform speed condition, or measuring and recording the maximum value of the "A" weighted sound pressure level, loudness value, and sharpness value of the measured noise within the preset measurement time range under the acceleration condition, and completing N measurements before the engine speed reaches 90% of the rated speed specified by the manufacturer.

[0110] The data processing module 103 processes the data collected by the noise measurement module, calculates the arithmetic mean of the N measurement data of each preset noise measurement point, and calculates the arithmetic mean of the "A" weighted sound pressure level, loudness value and sharpness value of each preset noise measurement point under the acceleration condition; and calculates the arithmetic mean of the "A" weighted sound pressure level and loudness value of each preset noise measurement point under the uniform speed condition.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A vehicle interior noise comfort testing method based on multi-dimensional indicators, characterized in that: The method comprises: When the acceleration running condition of the manual transmission vehicle meets the first preset acceleration condition, measure and record the maximum value of the "A" weighted sound pressure level, loudness value and sharpness value of the measured noise at each preset noise measuring point within the preset measurement time range, complete N measurements before the engine speed reaches 90% of the rated speed specified by the manufacturer, and take the arithmetic mean of the N measurement data of each preset noise measuring point as the "A" weighted sound pressure level, loudness value and sharpness value measured at each preset noise measuring point; When the acceleration running condition of the automatic transmission vehicle meets the second preset acceleration condition, measure and record the maximum value of the "A" weighted sound pressure level, loudness value and sharpness value of the measured noise at each preset noise measuring point within the preset measurement time range, complete N measurements before the engine speed reaches 90% of the rated speed specified by the manufacturer, and take the arithmetic mean of the N measurement data of each preset noise measuring point as the "A" weighted sound pressure level, loudness value and sharpness value measured at each preset noise measuring point; When the uniform speed operating condition of a manual transmission vehicle or an automatic transmission vehicle meets its corresponding preset uniform speed operating condition, measure and record the "A" weighted sound pressure level and loudness value of the measured noise at each preset noise measuring point within the preset measurement time range, complete N measurements, and take the arithmetic mean of the N measurement data of each preset noise measuring point as the "A" weighted sound pressure level and loudness value measured at each preset noise measuring point.

2. The vehicle interior noise comfort testing method based on multi-dimensional indicators according to claim 1 is characterized in that: The first preset acceleration condition is: when the vehicle speed stably reaches 15 km / h in gear II and the accelerator pedal is fully depressed; The second preset acceleration condition is: when the shift device is in the D gear or the gear specified by the vehicle manufacturer, the accelerator pedal is fully depressed and the vehicle speed range is between 10km / h and 50km / h; The preset uniform speed operating condition is: for a vehicle with a maximum speed of not less than 100 km / h, the preset uniform speed operating condition is when the vehicle is traveling at a uniform speed of 90 km / h; for a vehicle with a maximum speed of less than 100 km / h, the preset uniform speed operating condition is when the vehicle is traveling at a uniform speed of 80% of the maximum speed.

3. The vehicle interior noise comfort testing method based on multi-dimensional indicators according to claim 1 is characterized in that: The preset noise measurement point position includes: The right ear side of the driver's seat, the left ear side of the front passenger seat, the right ear side of the left rear seat, and the left ear side of the right rear seat.

4. The vehicle interior noise comfort testing method based on multi-dimensional indicators according to claim 3 is characterized in that: The vertical coordinate of the noise measuring point is set at (0.70±0.05) m above the intersection of the seat surface and the backrest surface, and the horizontal coordinate is set at (0.20±0.02) m from the center plane of the seat.

5. The vehicle interior noise comfort testing method based on multi-dimensional indicators according to claim 1 is characterized in that: Before measuring and recording the maximum value of the "A" weighted sound pressure level, loudness value and sharpness value of the measured noise at each preset noise measuring point within the preset measurement time range, or before measuring and recording the "A" weighted sound pressure level and loudness value of the measured noise at each preset noise measuring point within the preset measurement time range, the method further includes: Obtain the background noise at each preset noise measurement point; The step of obtaining the background noise at each preset noise measurement point includes: Acquire noise measurement data of each preset noise measurement point, wherein the continuous measurement time of the noise measurement data is not less than 10s; The highest "A" weighted sound pressure level data in the noise measurement data of each preset noise measurement point is used as its corresponding background noise, thereby obtaining the background noise at each preset noise measurement point position.

6. The vehicle interior noise comfort testing method based on multi-dimensional indicators according to claim 5 is characterized in that: The measured noise at each preset noise measurement point is greater than the background noise at the respective preset noise measurement point, and a difference ΔL between the measured noise and the background noise is greater than or equal to 10 dB.

7. The vehicle interior noise comfort testing method based on multi-dimensional indicators according to claim 6 is characterized in that: If the difference ΔL between the measured noise at the preset noise measurement point and the background noise at the preset noise measurement point satisfies 10≤ΔL<11, then the background noise at the preset noise measurement point is subtracted by 0.5dB; If the difference ΔL between the measured noise at the preset noise measurement point and the background noise at the preset noise measurement point satisfies 11≤ΔL<12, then the background noise at the preset noise measurement point is subtracted by 0.4dB; If the difference ΔL between the measured noise at the preset noise measurement point and the background noise at the preset noise measurement point satisfies 12≤ΔL<13, then the background noise at the preset noise measurement point is subtracted by 0.3dB; If the difference ΔL between the measured noise at the preset noise measurement point and the background noise at the preset noise measurement point satisfies 13≤ΔL<14, then the background noise at the preset noise measurement point is subtracted by 0.2dB; If the difference ΔL between the measured noise at the preset noise measurement point and the background noise at the preset noise measurement point satisfies 14≤ΔL<15, the background noise at the preset noise measurement point is subtracted by 0.1dB.

8. The vehicle interior noise comfort testing method based on multi-dimensional indicators according to claim 1 is characterized in that: Under any operating condition, if the maximum difference in the "A" weighted sound pressure level readings of N consecutive measurements at the same measuring point exceeds 2dB, continue measuring until the maximum difference in the readings of N consecutive measurements is within 2dB (A).

9. The vehicle interior noise comfort testing method based on multi-dimensional indicators according to claim 1 is characterized in that: Before measuring and recording the maximum value of the "A" weighted sound pressure level, loudness value and sharpness value of the measured noise at each preset noise measuring point within the preset measurement time range, or before measuring and recording the "A" weighted sound pressure level and loudness value of the measured noise at each preset noise measuring point within the preset measurement time range, the method further includes performing data processing on the measured noise obtained at each preset noise measuring point within the preset measurement time range, wherein the data processing includes: The loudness value is calculated using the following formula: N=∫N′df Where N is the loudness value, in sones; N′ is the critical band characteristic loudness value, in sones; f is the frequency, in Hertz; s is the correction factor, the constant value is 0.25; L TQ is the minimum perceptual threshold corresponding to the selected critical frequency band; L CB′ is the approximate critical band magnitude; The sharpness value is calculated using the following formula: Among them, S is the sharpness value, the unit is acum; K2 is the proportional factor, the value range is 0.105≤K2≤0.115; g(z) is the additional coefficient, which is a function of the critical frequency band; N′(z) is the critical frequency band characteristic loudness value; z is the corresponding critical frequency band, the unit is bark.

10. A vehicle interior noise comfort test system based on multi-dimensional indicators, characterized in that: The system comprises: The operating condition recognition module is responsible for identifying the vehicle's operating conditions, including the first preset acceleration condition for manual transmission vehicles, the second preset acceleration condition for automatic transmission vehicles, and the preset uniform speed conditions corresponding to manual transmission and automatic transmission vehicles, and determines whether the preset operating conditions are met based on the current state of the vehicle. The noise measurement module is responsible for performing noise measurement at each preset noise measurement point after identifying that the preset working conditions are met, measuring and recording the "A" weighted sound pressure level and loudness value of the measured noise within the preset measurement time range under the uniform speed working condition, or measuring and recording the maximum value of the "A" weighted sound pressure level, loudness value, and sharpness value of the measured noise within the preset measurement time range under the acceleration working condition; The data processing module processes the data collected by the noise measurement module and calculates the arithmetic mean of the N measurement data of each preset noise measurement point.

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