Calibration method, system and vehicle for simulating sound wave sound effect quality

Abstract

The present invention discloses a calibration method, system, and vehicle for calibrating the quality of simulated sound waves and sound effects. First, a vehicle acoustic cavity geometry model is established based on the CATIA three-dimensional model data of the entire vehicle. Then, the acoustic impedance parameters obtained by testing various acoustic materials in the vehicle through an impedance tube and the impedance curve and frequency response curve of the in-vehicle speaker obtained by using a closed box test method are respectively used as inputs of the acoustic cavity geometry model to eliminate the influence of the in-vehicle acoustic materials on the sound field and frequency response, and then solve the sound gain curve and sound order curve of the simulated sound waves suitable for this vehicle model. The acoustic cavity geometry model and CAN signal period are corrected based on the sound gain curve and sound order curve corrections of the test points, the accelerator pedal position change curve, and the engine speed change curve. The present invention can effectively improve the computational efficiency and calibration accuracy of the acoustic cavity modeling for calibrating simulated sound waves and sound effects.

Description

Technical Field

[0001] The present invention belongs to the field of production calibration operation technology in the field of in-vehicle entertainment driving technology, and specifically relates to a calibration method, system and vehicle for simulating the quality of sound waves and sound effects. Background Art

[0002] With the increasing intelligence of the automotive industry, consumers are increasingly demanding drivability and entertainment features. Traditional car noise, often found in racing or modified by enthusiasts, is expensive, creates excessive noise, and detracts from the city's appearance. Consequently, simulated in-car noise is gaining popularity in the market.

[0003] As disclosed in patent document CN202120535859.8, an intelligent system for universal simulated sound waves in automobiles includes a simulated sound wave controller, on which an OBD connector is provided, and the OBD connector is used to connect to the OBD interface of the automobile; the simulated sound wave controller has a simulated sound wave control system, which includes a network receiving module, an MCU, a data storage device, a sound wave main control module and a sound wave output module, the output end of the network receiving module and the output end of the data storage device are both connected to the input end of the MCU, the output end of the MCU is respectively connected to the input end of the data storage device and the input end of the sound wave main control module, and the output end of the sound wave main control module is connected to the input end of the sound wave output module. However, this system is a simulated sound wave system, and there is no reasonable and professional calibration method. It is impossible to ensure that the simulated sound waves are highly matched and integrated with the real dynamic parameters of the vehicle, and it is impossible to achieve an ideal auditory effect.

[0004] For example, patent document TW107122054 discloses a device for controlling simulated vehicle sound and vibration, which includes: a controller for selecting various vehicle models, the controller being connected to an engine by signal and detecting an engine speed of the engine, thereby outputting a simulated sound signal and a simulated vibration signal accordingly; a database being connected to the controller by signal, the database storing a sound file and a vibration file simulating the sound emitted by various vehicle models at different engine speeds, and the controller simulating the vibration generated by various vehicle models at different engine speeds. The sound and vibration files are read to generate the simulated sound and vibration signals. A sound unit is signal-connected to the controller to receive the simulated sound signal and play it back, simulating the sound effects of the selected vehicle model at the same engine speed. A vibration unit is signal-connected to the controller to receive the simulated vibration signal and generate vibrations to simulate the vibration frequency of the selected vehicle model at the same engine speed. A power supply is electrically connected to the controller to provide the power required to operate the controller, the sound unit, and the vibration unit. This device embodies a simulated sound system, but lacks a reasonable and professional calibration method. This makes it impossible to ensure that the simulated sound closely matches and integrates with the vehicle's actual dynamic parameters, and thus fails to achieve the desired auditory effect.

[0005] Therefore, it is necessary to develop a new calibration method, system and vehicle for simulating the sound quality of sound waves. Summary of the Invention

[0006] The present invention aims to provide a method, system, and vehicle for calibrating the quality of simulated sound effects. This method, while ensuring that the sound gain and order are highly matched with the vehicle's engine speed and accelerator pedal position, allows for quick and easy calibration, thereby improving the production efficiency and sound quality accuracy of calibrating electronic simulated sound effects.

[0007] In a first aspect, a method for calibrating the quality of a simulated sound effect according to the present invention comprises the following steps:

[0008] S100. Establishing a geometric model of the acoustic cavity of the vehicle to be calibrated based on the CATIA 3D model data of the vehicle;

[0009] S200. Detect the vehicle's health; obtain the impedance parameters of the vehicle's acoustic package; obtain the impedance curve and frequency response curve of the in-vehicle speakers; obtain dynamic characteristic values ​​of the vehicle model to be calibrated, which include engine speed and accelerator pedal position; select a prototype reference audio spectrum of the simulated sound waves of the vehicle model to be calibrated; and modify the acoustic cavity geometry model based on the impedance parameters of the vehicle's acoustic package and the impedance curve and frequency response curve of the in-vehicle speakers.

[0010] S300. Solve the acoustic cavity geometry model using the prototype reference audio spectrum and the dynamic eigenvalues ​​of the vehicle model to be calibrated to obtain target parameter values ​​for calibrating the sound quality of the simulated engine sound. The target parameters include a sound gain curve fitted to the accelerator pedal position eigenvalue and a sound order curve fitted to the engine speed eigenvalue.

[0011] S400. Obtain the measured sound gain curve, sound order curve, accelerator pedal position change curve, and engine speed change curve of the vehicle model to be calibrated;

[0012] S500. Compare the sound gain curve measured on the vehicle to be calibrated with the sound gain curve output by the acoustic cavity geometry model and fitted with the accelerator pedal position characteristic value, and the sound order curve measured on the vehicle to be calibrated with the sound order curve output by the acoustic cavity geometry model and fitted with the engine speed curve; if they are consistent, save the acoustic cavity geometry model; if they are inconsistent, adjust the vehicle acoustic package parameters and / or the dynamic characteristic values ​​of the vehicle to be calibrated to correct the acoustic cavity geometry model; compare the accelerator pedal position change curve with the sound gain change curve to see if they are synchronized; if not, adjust the input accelerator pedal position CAN signal period; compare the engine speed change curve with the sound frequency change curve to see if they are synchronized; if not, adjust the input engine speed CAN signal period;

[0013] Repeat steps S300 to S500 until the sound gain curve measured for the calibrated vehicle model is consistent with the sound gain curve output by the acoustic cavity geometry model and fitted with the accelerator pedal position characteristic value, the sound order curve measured for the vehicle model to be calibrated is consistent with the sound order curve fitted by the engine speed curve output by the acoustic cavity geometry model, and the accelerator pedal position change curve and the sound gain change curve, as well as the engine speed change curve and the sound frequency change curve are synchronized. This means that the calibration is completed and the calibration result data of the calibrated vehicle model is saved.

[0014] Optionally, the step S300 is specifically as follows:

[0015] The prototype reference audio spectrum data and the dynamic characteristic values ​​of the vehicle model to be calibrated are solved using the RBF curve fitting method to obtain the target parameter values ​​for calibrating the sound quality of the simulated engine sound.

[0016] Optionally, the correction of the acoustic cavity geometric model is specifically as follows:

[0017] The obtained static and dynamic engine speed characteristic values ​​and accelerator pedal position curves of the vehicle are compared with the acoustic package impedance parameters, in-vehicle speaker impedance curves, and in-vehicle speaker frequency response curves of multiple test points, and the simulated sound gain curve and sound order curve of the acoustic cavity geometry model suitable for the current vehicle model are fitted and calculated.

[0018] Optionally, in step S100, a three-dimensional digital acoustic cavity geometric model with a 1:1 ratio to the vehicle type to be calibrated is established using a three-dimensional model tool.

[0019] Optionally, in step S200, detecting the health status of the vehicle refers to detecting whether the fault code of the entire vehicle is normal, whether the acoustic package structure is complete, and whether the structure of the speaker in the vehicle is complete.

[0020] Optionally, in step S200, the impedance parameters of the whole vehicle acoustic package are obtained by extracting them from different positions of multiple acoustic package samples in mass production status through impedance tube testing, and the obtained test results are saved in a CSV file in the format of test frequency, test gain, real part of sound impedance and imaginary part of sound impedance.

[0021] Optionally, in step S200, obtaining the in-vehicle speaker impedance curve is to test the in-vehicle speaker impedance curve using a closed box test method; obtaining the in-vehicle speaker frequency response curve is to measure the frequency response curves of all speakers in the vehicle using a JustMLS system.

[0022] Optionally, in step S200, the vehicle dynamic characteristic values ​​of the vehicle model to be calibrated are obtained using a vehicle OBD tool, wherein the engine speed refers to the obtained engine power curve, and the accelerator pedal position refers to the obtained accelerator pedal response curve.

[0023] Optionally, in step S200, the prototype reference audio spectrum of the simulated sound of the selected vehicle model to be calibrated is the original reference audio of the simulated sound comprehensively selected and produced based on the vehicle model type, vehicle model positioning, vehicle target group and target style of the simulated sound.

[0024] Optionally, a database of the vehicle models to be calibrated is established, and the calibration result data of the calibrated vehicle models is saved as a CSV file and then stored in the database.

[0025] In a second aspect, the present invention provides a calibration system for calibrating the quality of simulated sound waves and sound effects, comprising a model building unit, a processing unit, a testing unit, and a correction unit, wherein the processing unit is connected to the model building unit, the testing unit, and the correction unit, respectively, and the correction unit is connected to the model building unit;

[0026] The model building unit is used to build a sound cavity geometry model of the vehicle model to be calibrated based on the CATIA three-dimensional model data of the whole vehicle;

[0027] The processing unit is used to solve the acoustic cavity geometric model based on the prototype reference audio spectrum and the dynamic characteristic values ​​of the vehicle model to be calibrated, and obtain target parameter values ​​for calibrating the sound quality of the simulated engine sound. The target parameters include a sound gain curve fitted with the accelerator pedal position characteristic value and a sound order curve fitted with the engine speed characteristic value;

[0028] The test unit is used to obtain the sound gain curve, sound order curve, accelerator pedal position change curve, and engine speed change curve measured on the vehicle to be calibrated;

[0029] The correction unit is used to compare whether the sound gain curve actually measured for the vehicle model to be calibrated is consistent with the sound gain curve output by the acoustic cavity geometry model and fitted with the accelerator pedal position characteristic value, and the sound order curve actually measured for the vehicle model to be calibrated is consistent with the sound order curve output by the acoustic cavity geometry model and fitted with the engine speed curve; if they are consistent, the acoustic cavity geometry model is saved; if they are inconsistent, the whole vehicle acoustic package parameters and / or the dynamic characteristic values ​​of the vehicle model to be calibrated are adjusted to correct the acoustic cavity geometry model; used to compare whether the accelerator pedal position change curve and the sound gain change curve are synchronized, if not synchronized, the input accelerator pedal position CAN signal period is adjusted; and used to compare whether the engine speed change curve and the sound frequency change curve are synchronized, if not synchronized, the input engine speed CAN signal period is adjusted;

[0030] The system is configured to execute the steps of the method for calibrating the quality of simulated sound waves and sound effects according to the present invention.

[0031] In a third aspect, a vehicle according to the present invention uses calibration result data calibrated by the calibration method for calibrating the quality of simulated sound waves and sound effects according to the present invention.

[0032] The present invention has the following advantages:

[0033] (1) The present invention first establishes a vehicle acoustic cavity geometry model based on the CATIA three-dimensional model data of the entire vehicle, and then uses the acoustic impedance parameters obtained by testing various acoustic materials in the vehicle through an impedance tube and the impedance curve and frequency response curve of the vehicle speaker obtained by using a closed box test method as inputs of the acoustic cavity geometry model, so as to eliminate the influence of the acoustic materials in the vehicle on the sound field and frequency response, and then solve the sound gain curve and sound order curve of the simulated sound wave suitable for this vehicle model; and according to the sound gain curve and sound order curve correction of the test point, the accelerator pedal position change curve, and the engine speed change curve, the acoustic cavity geometry model and the CAN signal period are corrected, thereby effectively improving the efficiency and accuracy of the acoustic cavity modeling operation for calibrating the simulated sound wave sound effect.

[0034] (2) The present invention is simple to operate, convenient for personnel to operate, and can change parameters in real time to adjust the simulated sound wave effect.

[0035] (3) The present invention can accurately match the real power parameters of the vehicle and achieve the effect of integration with the vehicle.

[0036] (4) The present invention can effectively ensure the consistency and stability of the sound quality of the calibration results of mass-produced vehicle models.

[0037] (5) The calibration period of the present invention is only one tenth of that of the traditional method of adjusting the simulated sound wave.

[0038] In summary, the present invention achieves fast and simple calibration while ensuring that the sound gain, order, and high matching with the vehicle engine speed and accelerator pedal position are achieved, thereby improving the production efficiency and sound quality accuracy of calibrating electronic simulated sound effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 is a flow chart of the main steps of this embodiment;

[0041] Figure 2 It is a principle block diagram of this embodiment;

[0042] Figure 3 is a schematic diagram of the calibration site layout of this embodiment;

[0043] Figure 4 This is a schematic diagram of the vehicle parking position for calibrating the starting point of simulated sound waves in this embodiment;

[0044] Figure 5 is a detailed flow chart of this embodiment;

[0045] In the figure: 10, model building unit, 11, processing unit, 12, testing unit, 13, correction unit. DETAILED DESCRIPTION

[0046] The present invention will be described in detail below with reference to the accompanying drawings.

[0047] like Figure 1 As shown, a calibration method for the quality of simulated sound waves and sound effects includes the following steps:

[0048] Step S100: establishing a sound cavity geometry model of the vehicle to be calibrated based on the CATIA 3D model data of the vehicle;

[0049] The CATIA 3D model data of the vehicle to be calibrated is input into the CATIA software to establish a 3D digital acoustic cavity geometric model that represents a completely closed interior space and is 1:1 with the vehicle to be calibrated.

[0050] Step S200: Detecting the vehicle's health status, specifically:

[0051] Check whether the vehicle fault code is normal, whether the acoustic package structure is complete, and whether the speaker structure in the car is complete.

[0052] Use an impedance tube to test and obtain the impedance parameters of the vehicle acoustic package, specifically:

[0053] The impedance is extracted from different positions of multiple acoustic package samples in mass production through impedance tube testing, and the obtained test results are saved in a CSV file in the format of test frequency, test gain, real part of sound impedance and imaginary part of sound impedance.

[0054] Obtain the impedance curve and frequency response curve of the car speaker, where:

[0055] Obtaining the impedance curve of the car speaker is to use the closed box test method to test the impedance curve of the car speaker;

[0056] Obtaining the frequency response curve of the car speakers is to use the JustMLS system to measure the frequency response curves of all the speakers in the car.

[0057] Use the vehicle OBD tool to obtain the vehicle dynamic characteristic values ​​of the vehicle model to be calibrated, which include engine speed and accelerator pedal position; among which, the engine speed here refers to obtaining the engine power curve, and the accelerator pedal position refers to obtaining the accelerator pedal response curve parameters.

[0058] Use the vehicle OBD tool to obtain the dynamic characteristic values ​​of the vehicle model to be calibrated, specifically:

[0059] In the static idling condition, connect the calibration equipment to the vehicle OBD port and the vehicle central control screen respectively, and record the engine speed characteristic value data at static idling;

[0060] In the case of dynamic slow acceleration, the vehicle is put into D gear, and the accelerator pedal is slowly depressed to increase the vehicle speed evenly from 0 km / h to 140 km / h. Then the accelerator pedal is released to allow the vehicle to automatically decelerate to the idle state. The engine speed characteristic value and the accelerator pedal position curve data are recorded.

[0061] In the case of dynamic rapid acceleration, the vehicle is shifted into D gear, and the accelerator pedal is quickly depressed to the deepest position. That is, the vehicle speed is increased to 140 km / h by floor throttle starting. Then the accelerator pedal is released to allow the vehicle to automatically decelerate to idle state. The engine speed characteristic value and accelerator pedal position curve data are recorded.

[0062] Select the prototype reference audio spectrum of the simulated sound waves of the vehicle to be calibrated, specifically:

[0063] The prototype reference audio spectrum of the simulated sound of the selected vehicle model to be calibrated is the original reference audio of the simulated sound that is comprehensively selected and produced based on the vehicle type, vehicle positioning, vehicle target group and target style of the simulated sound.

[0064] The acoustic cavity geometry model is modified using the Gaussian formula fitting method based on the impedance parameters of the vehicle acoustic package, the impedance curve of the in-vehicle speaker, and the frequency response curve of the in-vehicle speaker.

[0065] Step S300: Solve the acoustic cavity geometry model using the prototype reference audio spectrum and the dynamic characteristic values ​​of the vehicle model to be calibrated (i.e., solve the prototype reference audio spectrum data and the dynamic characteristic values ​​of the vehicle model to be calibrated using the RBF curve fitting method) to obtain target parameter values ​​for calibrating the sound quality of the simulated engine sound. The target parameters include a sound gain curve fitted with the accelerator pedal position characteristic value and a sound order curve fitted with the engine speed characteristic value.

[0066] Step S400: Obtain the sound gain curve, sound order curve, accelerator pedal position change curve, and engine speed change curve measured for the vehicle to be calibrated.

[0067] Step S500: Compare the sound gain curve measured on the vehicle to be calibrated with the sound gain curve output by the acoustic cavity geometry model and fitted with the accelerator pedal position characteristic value, and the sound order curve measured on the vehicle to be calibrated with the sound order curve output by the acoustic cavity geometry model and fitted with the engine speed curve; if they are consistent, save the acoustic cavity geometry model; if they are inconsistent, adjust the vehicle acoustic package parameters and / or the dynamic characteristic values ​​of the vehicle to be calibrated to correct the acoustic cavity geometry model. Compare the accelerator pedal position change curve with the sound gain change curve to see if they are synchronized. If they are not synchronized, indicating that the sound gain change curve lags behind the accelerator pedal position change curve by more than 30ms, then adjust the input accelerator pedal position CAN signal period. Compare the engine speed change curve with the sound frequency change curve to see if they are synchronized. If they are not synchronized, indicating that the sound frequency change curve lags behind the engine speed change curve by more than 30ms, then adjust the input engine speed CAN signal period.

[0068] In this embodiment, the 30 ms is the minimum time interval obtained from 100 experiments on the synchronization between the operation of the accelerator pedal and the human perception of the simulated sound wave changes.

[0069] In this embodiment, by continuously correcting the acoustic cavity geometry model and the CAN signal period, the computational modeling efficiency and calibration accuracy of the simulated sound wave and sound effects are further improved.

[0070] In this embodiment, the acoustic materials in the vehicle's spatial sound cavity are collectively referred to as acoustic packages, including the vehicle's interior leather texture, center console, front operating console, seats and other acoustic packages. Since the vehicle's spatial sound cavity is covered with a large number of acoustic materials, among which the interior leather texture, carpet, operating console, seats and other acoustic materials account for a large proportion, and these acoustic materials have a great influence on the sound field distribution inside the vehicle, therefore, in this embodiment, various types of acoustic materials, i.e., acoustic packages, are tested through impedance tubes to obtain the acoustic impedance parameters of the acoustic packages, which can also be called the acoustic impedance coefficients of the acoustic packages, and then the acoustic impedance parameters of the acoustic packages are applied to the acoustic cavity geometric model. The target parameter values ​​of the sound quality of the engine sound are used to characterize the sound quality inside the vehicle, and specifically may include the sound gain matrix and frequency curve at each position.

[0071] In this embodiment, the target parameters include the sound gain matrix and frequency curve as an example. Due to the differences between the modeled acoustic cavity geometry model and the actual vehicle, the actual sound curve test results of the test vehicle can be tested to see whether they are consistent with the sound spectrum measured by the vehicle to be calibrated and the prototype reference audio spectrum. If not, the input vehicle acoustic package parameters and / or the dynamic characteristic values ​​of the vehicle to be calibrated are obtained using the vehicle OBD tool to correct the acoustic cavity geometry model.

[0072] In this embodiment, a calibration method for the quality of simulated sound waves and sound effects is first established. A vehicle acoustic cavity geometric model is established based on the CATIA three-dimensional model data of the entire vehicle. Then, the acoustic impedance parameters obtained by testing various acoustic materials in the vehicle through an impedance tube and the impedance curve and frequency response curve of the in-vehicle speaker obtained by using a closed box test method are used as inputs of the acoustic cavity geometric model to eliminate the influence of the in-vehicle acoustic materials on the sound field and frequency response, and then solve the sound gain curve and sound order curve of the simulated sound waves suitable for this vehicle model; and the acoustic cavity geometric model and CAN signal period are corrected according to the sound gain curve and sound order curve correction of the test point, the accelerator pedal position change curve, and the engine speed change curve, which can effectively improve the computational efficiency and calibration accuracy of the acoustic cavity modeling for calibrating the simulated sound waves and sound effects.

[0073] In this embodiment, before calibration, necessary inspections need to be performed, mainly including tire pressure, front hood locking status, whether the vehicle has any faults, interior integrity, site cleanliness, no water accumulation on the site, and whether the speaker functions normally. Only when these conditions meet the requirements can the specific calibration process be carried out.

[0074] In this embodiment, during calibration, the vehicle is started, the windows are closed, the music is turned off, and the vehicle accelerates to 140 km / h on a 1 km runway. After the accelerator pedal is released, the vehicle naturally decelerates to idle and the data is recorded.

[0075] like Figure 2 As shown, in this embodiment, a calibration system for simulating sound wave and sound effect quality includes a model building unit 10, a processing unit 11, a testing unit 12 and a correction unit 13, wherein the processing unit 11 is connected to the model building unit 10, the testing unit 12 and the correction unit 13 respectively, and the correction unit 13 is connected to the model building unit 10.

[0076] In this embodiment, the model building unit 10 is used to build a sound cavity geometry model of the vehicle model to be calibrated based on the CATIA three-dimensional model data of the entire vehicle.

[0077] The processing unit 11 is used to solve the acoustic cavity geometry model using the prototype reference audio spectrum and the dynamic characteristic values ​​of the vehicle model to be calibrated obtained using the whole vehicle OBD tool, and obtain the target parameter values ​​for calibrating the sound quality of the simulated engine sound, the target parameters including the sound gain curve fitted with the accelerator pedal position characteristic value, and the sound order curve fitted with the engine speed characteristic value; wherein, the prototype reference audio spectrum is the audio spectrum data parsed by Audiition, and the dynamic characteristic values ​​of the vehicle model to be calibrated include the engine speed and the accelerator pedal position, and the engine speed and the accelerator pedal position are obtained by reading the whole vehicle CAN bus data test with the OBD tool, and the target parameters include the sound gain curve fitted with the accelerator pedal position characteristic value, and the sound order curve fitted with the engine speed characteristic value.

[0078] The test unit 12 is used to obtain the sound gain curve, sound order curve, accelerator pedal position change curve, and engine speed change curve of the vehicle to be calibrated.

[0079] The correction unit 13 is used to compare whether the sound gain curve actually measured for the vehicle model to be calibrated is consistent with the sound gain curve output by the acoustic cavity geometry model and fitted with the accelerator pedal position characteristic value, and the sound order curve actually measured for the vehicle model to be calibrated is consistent with the sound order curve output by the acoustic cavity geometry model; if they are consistent, the acoustic cavity geometry model is saved; if they are inconsistent, the whole vehicle acoustic package parameters and / or the dynamic characteristic values ​​of the vehicle model to be calibrated are adjusted to correct the acoustic cavity geometry model; it is used to compare whether the accelerator pedal position change curve and the sound gain change curve are synchronized, if not synchronized, the input accelerator pedal position CAN signal period is adjusted; and it is used to compare whether the engine speed change curve and the sound frequency change curve are synchronized, if not synchronized, the input engine speed CAN signal period is adjusted.

[0080] The simulated sound wave sound effect quality calibration system is configured to execute the steps of the simulated sound wave sound effect quality calibration method as described in this embodiment.

[0081] This embodiment describes the technical solution of the above embodiment in detail through specific examples. Figure 5 As shown, the process mainly includes:

[0082] 1. Modeling the acoustic cavity geometry model: Input the CATIA data of the vehicle model to be calibrated, and use Hypermesh to establish the acoustic cavity geometry model based on the B561 vehicle CAS data and taking into account the air propagation path. The modeling process of the acoustic cavity geometry model should consider the influence of the relationship between the acoustic cavity components and the distribution position of the speakers.

[0083] 2. Data collection: Detect the health status of the vehicle; obtain the impedance parameters of the vehicle acoustic package; obtain the impedance curve and frequency response curve of the in-vehicle speakers; obtain the dynamic characteristic values ​​of the vehicle model to be calibrated.

[0084] Specifically, the testing and input of acoustic materials are as follows:

[0085] The vehicle's acoustic cavity is covered with a large number of acoustic materials, most notably soft upholstery, carpet, seats, and leather textures. These materials significantly influence the in-vehicle sound field distribution. In this embodiment, various acoustic materials are tested using an impedance tube. The resulting impedance coefficients are applied to the acoustic cavity geometry using a curve fitting function. The impedance tube is then used to test the acoustic impedance of sheared acoustic package samples. The test results for each acoustic package are saved as CSV files. Each CSV file consists of three columns: frequency, real acoustic impedance, and imaginary acoustic impedance.

[0086] The test and input of acoustic load are as follows:

[0087] The sound source of the car's acoustic cavity comes from the sound of the speaker. The main parameters of the speaker sound are the sound gain sensitivity and the sound frequency response curve. Since this embodiment mainly focuses on the sound gain change curve and the sound frequency curve, the closed box test method is used to test the impedance curve and frequency response curve of the car's speaker. The characteristic values ​​obtained from the test are then input into the diaphragm of the acoustic cavity geometric model using an interpolation function.

[0088] 3. Simulation fitting model:

[0089] The acoustic cavity geometry model is solved using the prototype reference audio spectrum and the dynamic eigenvalues ​​of the vehicle model to be calibrated to obtain the target parameter values ​​for calibrating the sound quality of the simulated engine sound. The target parameters include the sound gain curve fitted with the eigenvalue of the accelerator pedal position and the sound order curve fitted with the eigenvalue of the engine speed; that is, the sound frequency response curve at the driver's ear in the car is solved. Based on the radial function Gaussian function:

[0090]

[0091] Solve the basis functions of the geometric model;

[0092] x: the distance between the prototype reference audio spectrum and the loudspeaker frequency response curve in the acoustic cavity geometry model;

[0093] μ: overall impedance curve of the acoustic cavity model;

[0094] δ: hyperparameter, i.e. adjustment correction parameter;

[0095] RBF fitting function:

[0096]

[0097] a0: constant

[0098] a i : The i-th dynamic characteristic value of the vehicle model to be calibrated is calculated, and the number of all discrete data points n is counted and brought into formula (2), and finally the fitting function f(x) is obtained.

[0099] The extracted fitting curve data is fitted into the vocal cavity geometry model.

[0100] Set the simulated sound frequency:

[0101] Set the speed step accuracy and loading frequency range. The speed step accuracy is set to 20r / min, and the loading frequency range is 1000Hz~3000Hz.

[0102] Set the accelerator pedal depth and gain range. The accelerator pedal depth of 0% to 100% corresponds to a sound wave gain range of -12dB to 0.2dB.

[0103] Calibration parameter output:

[0104] 3a. Define vehicle model parameters: Define the parameters of the vehicle model to be calibrated in the boundary condition module, specifically including the name of the vehicle model to be calibrated, the vehicle engine model, the speaker parameters, and the audio spectrum fitting curve data output from formula (2);

[0105] 3b. Define calculation steps: Define the calculation steps in the analysis module, including the calculation name, the associated engine speeds for idle and acceleration, and the associated accelerator pedal depths from 0% to 100%.

[0106] 3c. Define output: Define the output in the processing module. Specifically, define the sound wave gain as a dot matrix corresponding to the accelerator pedal depth and the sound wave frequency as the sound wave frequency order data fitted with the engine speed characteristic value;

[0107] 4. Export the file and integrate it into the DSP processor;

[0108] 4a. Import the data output in step 3c into the analog sound wave audio processing module in the DSP processor. If the application interface prompts that the import is complete, it means that the current data has been successfully imported;

[0109] 4b. Integrate the results output in step 4a into the central control screen MCU and complete the installation. If the application interface prompts that the installation is successful, it means that the calibration result data has been successfully imported;

[0110] 4c. Use a recording device to record the simulated sound wave audio data from the driver's position in the vehicle, and use Audiition to analyze whether the measured sound spectrum of the vehicle to be calibrated is consistent with the prototype reference audio spectrum (i.e., compare the measured sound gain curve of the vehicle to be calibrated with the sound gain curve output by the acoustic cavity geometry model that is fitted with the accelerator pedal position eigenvalue, and compare the measured sound order curve of the vehicle to be calibrated with the sound order curve output by the acoustic cavity geometry model that is fitted with the engine speed curve). If they are inconsistent, adjust the input vehicle acoustic package parameters and / or use the vehicle OBD tool to obtain the dynamic eigenvalues ​​of the vehicle to be calibrated to correct the acoustic cavity geometry model; compare the accelerator pedal position change curve with the sound gain change curve for synchronization; if not, adjust the input accelerator pedal position CAN signal period; compare the engine speed change curve with the sound frequency change curve for synchronization; if not, adjust the input engine speed CAN signal period.

[0111] 5. Model Correction: Based on the vehicle's acoustic package impedance parameters and the in-vehicle speaker impedance and frequency response curves, the acoustic cavity geometry model is corrected using the Gaussian equation fitting method. After these modifications, simulation fitting is performed until the calibration results meet the requirements. The calibration results are saved, and the calibration is complete.

[0112] like Figure 3 As shown, necessary checks need to be done before calibration, mainly including whether the vehicle health conditions such as tire pressure, site cleanliness, engine, transmission, shifter and in-car speaker functions are normal. Only when these requirements are met can the specific calibration process be carried out.

[0113] like Figure 4 As shown, the vehicle enters the calibration site:

[0114] (1) Stop the vehicle at the starting position and align it so that it can follow the test track;

[0115] (2) Operate the vehicle forward and slightly adjust the vehicle position so that the vehicle stops at the middle of the runway starting point;

[0116] (3) Press the Drive Mode button to enter Race mode.

[0117] Calibration is performed using the method described in this embodiment. After completion, the relevant calibration equipment is returned to its original position, and the vehicle is driven away from the calibration site. The method is simple to operate and only requires re-importing vehicle dynamic parameters for different vehicle models, significantly reducing the workload for development and calibration. This method effectively ensures that the simulated engine sound of the vehicle is integrated with the vehicle's drivability.

[0118] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. Each box in the flowchart or block diagram can represent a module, program segment, or part of the code, and the above-mentioned module, program segment, or part of the code contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0119] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A method for calibrating the quality of simulated sound effects, characterized in that: The following steps are involved: S100. Establishing a geometric model of the acoustic cavity of the vehicle to be calibrated based on the CATIA 3D model data of the vehicle; S200. Check vehicle health status; Obtain the impedance parameters of the vehicle's acoustic package; obtain the impedance curve and frequency response curve of the vehicle's speakers; Obtain the dynamic characteristic values ​​of the vehicle model to be calibrated; The dynamic characteristic values ​​of the vehicle model to be calibrated include engine speed and accelerator pedal position, and a prototype reference audio spectrum of the simulated sound waves of the vehicle model to be calibrated is selected; the acoustic cavity geometric model is modified based on the impedance parameters of the vehicle acoustic package and the impedance curve and frequency response curve of the in-vehicle speaker; S300. Solve the acoustic cavity geometry model using the prototype reference audio spectrum and the dynamic eigenvalues ​​of the vehicle model to be calibrated to obtain target parameter values ​​for calibrating the sound quality of the simulated engine sound. The target parameters include a sound gain curve fitted to the accelerator pedal position eigenvalue and a sound order curve fitted to the engine speed eigenvalue. S400. Obtain the measured sound gain curve, sound order curve, accelerator pedal position change curve, and engine speed change curve of the vehicle model to be calibrated; S500. Compare the sound gain curve measured on the vehicle to be calibrated with the sound gain curve output by the acoustic cavity geometry model and the accelerator pedal position characteristic value fitted, and the sound order curve measured on the vehicle to be calibrated with the sound order curve fitted by the engine speed curve output by the acoustic cavity geometry model to see if they are consistent; If they are consistent, the acoustic cavity geometry model is saved; if they are inconsistent, the vehicle acoustic package parameters and / or the vehicle dynamic characteristic values ​​of the model to be calibrated are adjusted to correct the acoustic cavity geometry model; the accelerator pedal position change curve is compared with the sound gain change curve to see if they are synchronized. If they are not synchronized, the input accelerator pedal position CAN signal period is adjusted; the engine speed change curve is compared with the sound frequency change curve to see if they are synchronized. If they are not synchronized, the input engine speed CAN signal period is adjusted; Repeat steps S300 to S500 until the sound gain curve measured for the calibrated vehicle model is consistent with the sound gain curve output by the acoustic cavity geometry model and fitted with the accelerator pedal position characteristic value, the sound order curve measured for the vehicle model to be calibrated is consistent with the sound order curve fitted by the engine speed curve output by the acoustic cavity geometry model, and the accelerator pedal position change curve and the sound gain change curve, as well as the engine speed change curve and the sound frequency change curve are synchronized. This means that the calibration is completed and the calibration result data of the calibrated vehicle model is saved.

2. The method for calibrating the quality of simulated sound effects according to claim 1, wherein: The step S300 is specifically as follows: The prototype reference audio spectrum data and the dynamic characteristic values ​​of the vehicle model to be calibrated are solved using the RBF curve fitting method to obtain the target parameter values ​​for calibrating the sound quality of the simulated engine sound.

3. The method for calibrating the quality of simulated sound effects according to claim 2, wherein: The corrections to the acoustic cavity geometry model are as follows: The obtained static and dynamic engine speed characteristic values ​​and accelerator pedal position curves of the vehicle are compared with the acoustic package impedance parameters, in-vehicle speaker impedance curves, and in-vehicle speaker frequency response curves of multiple test points, and the simulated sound gain curve and sound order curve of the acoustic cavity geometry model suitable for the current vehicle model are fitted and calculated.

4. The method for calibrating the quality of simulated sound waves according to any one of claims 1 to 3, characterized in that: In step S100, a three-dimensional digital acoustic cavity geometric model with a 1:1 ratio to the vehicle model to be calibrated is established using a three-dimensional model tool.

5. The method for calibrating the quality of simulated sound effects according to claim 4, wherein: In step S200, detecting the vehicle health status refers to detecting whether the vehicle fault code is normal, whether the acoustic package structure is complete, and whether the in-vehicle speaker structure is complete.

6. The method for calibrating the quality of simulated sound effects according to claim 5, wherein: In step S200, the impedance parameters of the whole vehicle acoustic package are obtained by testing different positions of multiple acoustic package samples in mass production status through impedance tubes, and the obtained test results are saved in a CSV file in the format of test frequency, test gain, real part of sound impedance and imaginary part of sound impedance.

7. The method for calibrating the quality of simulated sound effects according to claim 6, wherein: In step S200, the impedance curve of the in-vehicle speaker is obtained by using a closed box test method to test the impedance curve of the in-vehicle speaker; and the frequency response curve of the in-vehicle speaker is obtained by using a JustMLS system to measure the frequency response curves of all the speakers in the vehicle.

8. The method for calibrating the quality of simulated sound effects according to claim 7, wherein: In step S200, the vehicle dynamic characteristic values ​​of the vehicle model to be calibrated are obtained using a vehicle OBD tool, wherein the engine speed refers to the obtained engine power curve, and the accelerator pedal position refers to the obtained accelerator pedal response curve.

9. The method for calibrating the quality of simulated sound effects according to claim 8, wherein: In step S200, the prototype reference audio spectrum of the simulated sound of the selected vehicle model to be calibrated is the original reference audio of the simulated sound that is comprehensively selected and produced based on the vehicle type, vehicle positioning, vehicle target group and target style of the simulated sound.

10. The method for calibrating the quality of simulated sound waves according to any one of claims 5 to 9, characterized in that: Establish a database of the current vehicle models to be calibrated, save the calibration result data of the calibrated vehicle models as a CSV file and store it in the database.

11. A calibration system for simulating sound wave and sound effect quality, characterized by: The invention comprises a model building unit (10), a processing unit (11), a testing unit (12) and a correction unit (13), wherein the processing unit (11) is connected to the model building unit (10), the testing unit (12) and the correction unit (13), respectively, and the correction unit (13) is connected to the model building unit (10); The model building unit (10) is used to build a sound cavity geometry model of the vehicle model to be calibrated based on the CATIA three-dimensional model data of the whole vehicle; The processing unit (11) is used to solve the acoustic cavity geometry model according to the prototype reference audio spectrum and the dynamic characteristic value of the vehicle model to be calibrated, and obtain the target parameter value for calibrating the sound effect quality of the simulated engine sound, wherein the target parameter includes a sound gain curve fitted with the accelerator pedal position characteristic value and a sound order curve fitted with the engine speed characteristic value; The test unit (12) is used to obtain the sound gain curve, sound order curve, accelerator pedal position change curve, and engine speed change curve of the vehicle to be calibrated; The correction unit (13) is used to compare whether the sound gain curve actually measured for the vehicle model to be calibrated is consistent with the sound gain curve output by the acoustic cavity geometry model and fitted with the accelerator pedal position characteristic value, and the sound order curve actually measured for the vehicle model to be calibrated is consistent with the sound order curve output by the acoustic cavity geometry model and fitted with the engine speed curve; if they are consistent, the acoustic cavity geometry model is saved; if they are inconsistent, the whole vehicle acoustic package parameters and / or the dynamic characteristic values ​​of the vehicle model to be calibrated are adjusted to correct the acoustic cavity geometry model; used to compare whether the accelerator pedal position change curve is synchronized with the sound gain change curve, if not, adjusting the input accelerator pedal position CAN signal period; and used to compare whether the engine speed change curve is synchronized with the sound frequency change curve, if not, adjusting the input engine speed CAN signal period; The system is configured to execute the steps of the method for calibrating the quality of simulated sound waves and sound effects as claimed in any one of claims 1 to 10.

12. A vehicle, characterized in that: The calibration result data is obtained by using the calibration method for calibrating the quality of simulated sound waves and sound effects as described in any one of claims 1 to 10.

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