CN110718206B - Sound target setting method of active sound production system and active sound production system - Google Patents
Sound target setting method of active sound production system and active sound production system Download PDFInfo
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- CN110718206B CN110718206B CN201910824269.4A CN201910824269A CN110718206B CN 110718206 B CN110718206 B CN 110718206B CN 201910824269 A CN201910824269 A CN 201910824269A CN 110718206 B CN110718206 B CN 110718206B
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K15/00—Acoustics not otherwise provided for
- G10K15/02—Synthesis of acoustic waves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q5/00—Arrangement or adaptation of acoustic signal devices
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K15/00—Acoustics not otherwise provided for
- G10K15/04—Sound-producing devices
Abstract
The invention relates to the technical field of active sounding systems of electric automobiles, in particular to a sound target setting method of an active sounding system and the active sounding system, which comprise the following steps: for acceleration driving, obtaining a gear of a typical acceleration driving condition of a reference vehicle; obtaining a third curve of the original sound amplitude in the vehicle, the sound amplitude of the order component of the engine in the vehicle and the sound amplitude of the background sound in the vehicle changing with the rotating speed of the engine under the typical acceleration running condition; fitting each third curve to obtain a total sound value target trend line in the electric automobile, a sound target trend line of an active sound production system of the electric automobile and an original sound target trend line in the electric automobile under the acceleration running working condition; and for the constant-speed running, setting a reference vehicle aiming at a target, obtaining the sound frequency spectrum in the constant-speed running vehicle at different speeds, and calculating to obtain a target set value of the total sound value in the electric vehicle, the total sound value of the active sound system and the total sound value in the original vehicle under the typical working condition of the constant-speed running.
Description
Technical Field
The invention relates to the technical field of active sounding systems of electric automobiles, in particular to a sound target setting method of an active sounding system and the active sounding system.
Background
The electric automobile cancels a power assembly system of a traditional automobile such as an engine, an air intake and exhaust system and the like, and is additionally provided with a driving motor, a power battery and the like, the sound in the electric automobile mainly comprises motor noise, road noise and wind noise, wherein the motor noise frequency characteristic is represented by a high frequency characteristic, and the road noise and the wind noise are represented by a broadband random noise characteristic. The electric automobile has no engine noise, although the amplitude of the noise in the automobile can be effectively reduced, due to the fact that the masking effect of the engine noise is avoided, the dynamic change of the sound in the automobile is represented by the motor order sound which changes along with the change of the automobile speed, and the motor order sound is mainly composed of a plurality of single pure sound components with high-frequency characteristics. Although the energy of the motor order components is not large, due to the characteristics of high frequency and single frequency pure tone, the amplitude is too large, and the motor order components can be annoying and uncomfortable in hearing. Therefore, the motor order sound has a significant impact on the sound quality in an electric vehicle, and NVH engineers are working to control or even eliminate this sound.
Under the development trend, the sounds in electric automobiles of different brands tend to be homogenized without sound quality characteristic identification, meanwhile, road noise and wind noise which change along with the dynamic driving of the automobile are not enough to provide effective feedback information for a driver, and the lack of the feedback information on hearing can lead the driver to not control the running state of the automobile comprehensively enough and possibly generate certain deviation on the judgment of the driving state of the automobile, so that an active sounding technology in the electric automobile is very necessary, and a feedback sound which can change along with the dynamic driving of the automobile can be actively provided for the driver in the automobile.
Therefore, a sound target setting method for an active sound system and an active sound system are needed to solve the above technical problems.
Disclosure of Invention
The invention aims to provide a sound target setting method of an electric automobile active sound system and the active sound system, which can purposefully set the target of the sound of the electric automobile active sound system.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, a method for setting a sound target of an active sound system is provided, which includes the following steps:
for the acceleration running condition, obtaining a gear of a typical acceleration running condition of a target setting reference vehicle;
setting a reference vehicle according to a target, and obtaining a third curve of the original sound amplitude in the vehicle, the sound amplitude of the order component of the engine in the vehicle and the sound amplitude of the background sound in the vehicle which are changed along with the rotating speed of the engine under a typical acceleration running working condition;
fitting each third curve to obtain a total sound value target trend line in the electric automobile, a sound target trend line of an active sound production system of the electric automobile and an original sound target trend line in the electric automobile under the acceleration running working condition;
and for the constant-speed running working condition, setting a reference vehicle according to a target, obtaining a sound spectrum cloud chart in the constant-speed running vehicle at different speeds, separating the order component sound of an engine in the constant-speed running vehicle at each speed from background sound, and calculating to obtain a target set value of the total sound value in the electric vehicle, the total sound value of the active sound system and the total sound value in the original vehicle under the typical constant-speed running working condition.
As a preferable aspect of the active sound system sound target setting method, the obtaining of the gear of the target setting reference vehicle in the acceleration running condition includes the steps of: aiming at the electric automobile, acquiring a first curve of the virtual engine rotating speed of the active sound system changing along with the automobile speed in a sound production speed interval of the active sound system of the electric automobile; setting a reference vehicle according to a target, and acquiring a second curve of the vehicle speed changing along with the engine speed under the accelerated running working condition of each gear; and for each gear acceleration running condition of the target set reference vehicle, selecting a gear closest to a first curve of the relation between the virtual engine speed and the vehicle speed of the active sound system, and determining the gear as a typical acceleration running condition of the target set reference vehicle.
As a preferred scheme of the sound target setting method of the active sound production system, the virtual engine speed of the active sound production system is defined, the speed range of the active sound production in the electric automobile is defined within the range of 0-120km/h, and the virtual engine speed nvEqualing virtual engine speed changeMultiplying the quantity A by the vehicle speed V and then adding the virtual engine idle speed nI; calculating according to the formula to obtain a first curve of the virtual engine rotating speed of the active sound system changing along with the vehicle speed;
wherein the virtual engine speed variation A is equal to the virtual engine rated speed nRAnd the virtual engine idling speed is rotated by nIThe difference of (d) is divided by 120.
As a preferred scheme of the sound target setting method of the active sound system, a reference vehicle is set aiming at a target, data of the vehicle speed and the engine speed in the acceleration running process under the condition of 100% of accelerator opening degree of each gear are collected, and a second curve of the acceleration running vehicle speed along with the change of the engine speed under each gear is drawn.
As a preferred scheme of the sound target setting method of the active sound production system, a reference vehicle is set for a target, acceleration running is carried out under the condition that the opening degree of an accelerator pedal is fixed at 100% under the gear of a typical acceleration running working condition, in-vehicle sound, engine rotating speed and vehicle speed signals are collected, and a sound frequency spectrum cloud picture in the acceleration running vehicle under the condition that the opening degree of the accelerator pedal is 100% is obtained through discrete short-time fast Fourier analysis on the collected signals.
As a preferred scheme of the sound target setting method of the active sound system, a reference vehicle is set according to a target, a sound spectrum cloud picture in an accelerated running vehicle under the condition of 100% of opening of an accelerator pedal is obtained, and an engine order sound spectrum cloud picture in the vehicle and a background sound spectrum cloud picture in the vehicle are extracted and obtained.
As an optimal scheme of the sound target setting method of the active sound production system, time domain signals of the engine order component sound and the vehicle interior background sound in the vehicle under the accelerated driving condition are obtained by performing discrete Fourier transform synthesis on the extracted vehicle engine order component sound spectrum and the vehicle interior background sound spectrum, and on the basis, total values of the vehicle interior original sound, the vehicle interior engine order component sound and the vehicle interior background sound are calculated by tracking the rotating speed of the engine, so that a third curve of the vehicle interior original sound amplitude, the vehicle interior engine order component sound amplitude and the vehicle interior background sound amplitude changing along with the rotating speed of the engine is obtained.
As a preferred scheme of the sound target setting method of the active sound production system, according to the in-vehicle engine order sound and the in-vehicle background sound under each specified vehicle speed constant-speed running working condition, calculating to obtain a target setting reference vehicle in-vehicle sound total value, an in-vehicle engine order sound total value, an in-vehicle background sound total value, and a sound pressure level difference value between the in-vehicle engine order sound total value and the in-vehicle background sound total value;
and obtaining the total value of the internal sound of the electric automobile, the total value of the sound of the active sound system and the target set value of the total value of the internal sound of the original automobile under the constant-speed running condition of the electric automobile according to a first curve of the virtual engine rotating speed of the active sound system changing along with the speed of the automobile and a target set reference vehicle under the constant-speed running typical working condition, the total value of the internal engine order sound, the total value of the internal background sound of the automobile and the sound pressure level difference value of the total value of the internal engine order sound and the total value of the internal background sound of the automobile.
In another aspect, an active sound production system is provided, which includes the active sound production system sound target setting method as described above.
The invention has the beneficial effects that:
the method for setting the sound target of the active sound production system can select the core competitive product vehicle type with the sound quality characteristics in the electric vehicle as the target setting reference vehicle according to the vehicle type positioning of the electric vehicle with the active sound production system to be carried and the preference of a target sales group, and can set the sound target of the active sound production system of the electric vehicle aiming at the target sales group with a pertinence.
In order to facilitate the sound target setting of the electric automobile active sound production system, a concept of virtual engine rotating speed is provided, the speed of the automobile is connected with the sound frequency of the active sound production system through the parameter, and the sound target setting of the electric automobile active sound production system can be effectively carried out according to the test result of the target reference automobile interior sound. On the basis, according to a relation curve of the virtual engine speed of the active sound production system of the electric automobile and the vehicle speed, selecting an accelerated running working condition under a gear position of the engine speed change curve closest to the speed change curve from engine speed change curves of all gear positions of a target reference vehicle as a typical working condition under the accelerated running condition of the target reference vehicle, wherein the sound of the active sound production system and the sound of the engine order in the target reference vehicle are in one-to-one correspondence from the basic frequency and the sound amplitude setting because the virtual engine speed of the active sound production system of the electric automobile is equal to the engine speed of the target reference vehicle; meanwhile, in the whole range of the engine speed change interval, under the condition of the same engine speed, the speed of the electric automobile is basically consistent with that of the target reference vehicle, so that the target setting of the total sound in the electric automobile and the background sound in the original automobile can be carried out according to the sound in the target reference vehicle and the background sound under the same speed. On the contrary, if other gear working conditions of the target reference vehicle are selected to perform in-vehicle sound target setting of the electric vehicle, under the condition of the virtual engine speed and the engine speed with equal values, the speed of the electric vehicle is greatly different from that of the target reference vehicle, and because the amplitude of the background sound in the electric vehicle and the target reference vehicle is closely related to the speed of the electric vehicle, the in-vehicle sound of the electric vehicle cannot perform target setting according to the in-vehicle background sound of the target reference vehicle.
The method comprises the steps of further collecting and analyzing the sound in a vehicle of a target reference vehicle under typical working conditions, extracting the order sound of an engine in the vehicle and the background sound in the vehicle, then calculating the original sound amplitude in the vehicle, the sound amplitude of the order component of the engine in the vehicle and the background sound amplitude in the vehicle, and setting the sound of the active sound system of the electric vehicle during accelerated running according to the total sound value in the electric vehicle, the total sound value of the active sound system and the total sound value of the original vehicle in the vehicle, so that the whole sound effect of the electric vehicle with the active sound system can be comprehensively considered. The method provided by the invention has the advantages that the sound target requirement of the market on the active sound production system of the electric automobile is considered, the driving behaviors with different working conditions of accelerated driving and uniform speed driving can be considered according to the in-vehicle sound of the target reference vehicle, the sound target setting of the active sound production system of the electric automobile is reasonably carried out, and the expectation of the market and target sales groups on the sound of the active sound production system is met.
Drawings
FIG. 1 is a first graph of virtual engine speed varying with vehicle speed within a range of speed of sounding with an active sounding system of an electric vehicle according to the present invention;
FIG. 2 is a second graph of acceleration travel speed versus engine speed for each gear provided by the present invention;
FIG. 3 is a graph of the results of an in-vehicle sound test with 100% accelerator pedal opening provided by the present invention;
FIG. 4 is a graph illustrating engine speed measurements at 100% accelerator pedal opening provided by the present invention;
FIG. 5 is a cloud of a spectrum of sound in an accelerated vehicle at a constant accelerator pedal opening of 100% according to the present invention;
FIG. 6 is a frequency spectrum cloud of the original engine order sound of the vehicle when the vehicle is accelerated at 100% accelerator pedal opening according to the present invention;
FIG. 7 is a spectrum cloud of the background sound in the original car when the car is accelerated at 100% accelerator pedal opening according to the present invention;
FIG. 8 is a third graphical illustration of the variation of the in-vehicle original sound amplitude, the in-vehicle engine order component sound amplitude, and the in-vehicle background sound amplitude with engine speed in accordance with the present invention;
FIG. 9 is a sound target trend line of the electric vehicle active sound system according to the present invention;
FIG. 10 is a comparison of the results of the in-vehicle acoustic noise under the constant speed driving condition of the target reference vehicle according to the present invention;
FIG. 11 is a schematic diagram illustrating a variation curve of a difference between an engine order sound and a background sound in a vehicle when a target reference vehicle travels at a constant speed according to the present invention;
fig. 12 is a schematic diagram of an in-vehicle sound target setting curve of the active sound generation system of the electric vehicle under the constant speed driving condition provided by the present invention;
FIG. 13 is a schematic diagram of a target setting curve of a difference between a sound of an electric vehicle active sound system and a sound in an original electric vehicle under a constant speed driving condition according to the present invention;
FIG. 14 is a graph illustrating a comparison curve between the original in-vehicle total sound value of the electric vehicle and the in-vehicle background sound value of the target set reference vehicle under the constant speed driving condition;
fig. 15 is a schematic diagram of a target curve of the total sound value in the electric vehicle and the total sound value of the active sound system under the constant speed driving condition according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are used only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements to be referred to must have specific orientations, be constructed in specific orientations, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Example one
The embodiment discloses a sound target setting method of an active sound production system, which comprises the following steps:
for the acceleration running condition, obtaining a gear of a typical acceleration running condition of a target setting reference vehicle;
setting a reference vehicle according to a target, and obtaining a third curve of the original sound amplitude in the vehicle, the sound amplitude of the order component of the engine in the vehicle and the sound amplitude of the background sound in the vehicle which are changed along with the rotating speed of the engine under a typical acceleration running working condition;
fitting each third curve to obtain a total sound value target trend line in the electric automobile, a sound target trend line of an active sound production system of the electric automobile and an original sound target trend line in the electric automobile under the acceleration running condition;
and for the constant-speed running working condition, setting a reference vehicle according to a target, obtaining a sound spectrum cloud chart in the constant-speed running vehicle at different speeds, separating the order component sound of an engine in the constant-speed running vehicle at each speed from background sound, and calculating to obtain a target set value of the total sound value in the electric vehicle, the total sound value of the active sound system and the total sound value in the original vehicle under the typical constant-speed running working condition.
Example two
The embodiment discloses a sound target setting method of an active sound production system, which comprises the following steps:
an active sound system sound target setting reference vehicle is determined. Specifically, according to the vehicle type positioning of the electric vehicle to be equipped with the active sound production system and the preference of a target sales group, the subjective perception of the sound in the accelerated running vehicle (such as the sound quality characteristics of comfort feeling/luxury feeling/dynamic feeling/motion feeling) to be realized is determined, and the core competitive model type corresponding to the sound quality characteristics in the electric vehicle is selected as the sound target setting reference vehicle of the electric vehicle active sound production system.
And defining the virtual engine speed of the active sound production system of the electric automobile. Specifically, in order to facilitate the control of the sound frequency of the active sound system of the electric automobile, a variable of a virtual engine speed is set between the speed of the vehicle or the motor speed and the sound frequency, the virtual engine speed is calculated according to the speed of the vehicle or the motor speed, and the active sound system can synthesize the engine sound with the corresponding frequency according to the virtual engine speed.
Defining the sound production speed interval of the active sound production system of the electric automobile in the range of 0-120km/h, defining the virtual engine rotating speed interval as the interval from the idling speed of the engine to the rated engine rotating speed (for example, 750-6000r/min), namely the speed of the automobile 0km/h corresponds to the idling speed of the virtual engine, and the speed of the automobile 120km/h corresponds to the rated virtual engine rotating speed, and simultaneously summarizing a virtual engine rotating speed calculation formula based on the speed of the electric automobile according to the rule that the engine rotating speed of the traditional internal combustion engine automobile linearly changes along with the speed of the automobile in a certain fixed gear:
nV＝A×V+nI…………(1)
in the formula, nVSimulating the engine speed for an active sound production system of the electric automobile; a is a virtual engine speed variation per vehicle speed, wherein:
wherein n isRFor a virtual engine rated speed, nIIs a virtual engine idle speed; v is the vehicle speed. A first curve chart of virtual engine rotating speed changing with vehicle speed in a sound production vehicle speed interval of the active sound production system of the electric vehicle is obtained according to the formula (1), and is shown in figure 1.
Specifically, for the target setting reference vehicle, the vehicle is accelerated to a vehicle speed corresponding to a rated engine speed from a minimum stable vehicle speed corresponding to a gear position by 100% of an accelerator pedal opening degree under different gear positions, data of the vehicle speed and the engine speed in the acceleration running process under the 100% of the accelerator pedal opening degree of each gear position are synchronously acquired, and a second curve of the relationship between the acceleration running vehicle speed and the engine speed under each gear position is drawn, as shown in fig. 2.
For the acceleration running condition, the gear closest to the relation curve of the virtual engine speed and the vehicle speed of the active sound production system in the figure 1 is selected as a target to set a typical acceleration running condition of the reference vehicle. In the example, it can be seen that the speed curve of the 3-gear acceleration running engine is closest to the virtual speed curve of the active sounding system, the speed of the vehicle is slightly greater than that of the active sounding system of the electric vehicle at the same engine speed, the difference in the overall working condition change is not great, and it is indicated that the sound total value target of the 100% accelerator pedal opening acceleration running working condition of the active sounding system can be set according to the vehicle sound of the 3-gear 100% accelerator pedal opening acceleration running working condition of the traditional vehicle.
The virtual engine rotating speed of the active sound production system of the electric automobile is equal to the rotating speed of the target reference vehicle engine, so that the sound of the active sound production system and the sound of the target reference vehicle engine in-vehicle engine order are set to be in one-to-one correspondence from the basic frequency and the sound amplitude; meanwhile, in the whole range of the engine speed change interval, under the condition of the same engine speed, the speed of the electric automobile is basically consistent with that of the target reference vehicle, so that the target setting of the total sound in the electric automobile and the background sound in the original automobile can be carried out according to the sound in the target reference vehicle and the background sound under the same speed. If other gear working conditions are selected for carrying out sound target setting in the electric automobile, under the condition of the virtual engine rotating speed and the engine rotating speed which are equal in numerical value, the speed of the electric automobile is greatly different from the speed of the target reference vehicle, and the amplitude of the background sound in the electric automobile and the target reference vehicle depends on the speed of the electric automobile, so that the sound in the original electric automobile cannot carry out target setting according to the background sound in the target reference vehicle.
And for the constant-speed running working condition, selecting the constant-speed running of the vehicle at the engine rotating speeds of 1000r/min, 2000r/min, 3000r/min, 4000r/min, 5000r/min and 6000r/min as the typical sound working condition in the constant-speed running vehicle, and setting a reference basis for the sound target of the active sound system of the electric vehicle for the constant-speed running.
And (4) collecting the sound in the target set reference vehicle under the accelerated running condition. Specifically, on an outdoor horizontal and smooth asphalt road surface, the gear of a transmission of a test sample vehicle is adjusted to be in a 3-gear position, the opening degree of an accelerator pedal is fixed under the opening degree of a 100% accelerator pedal for acceleration driving operation, so that the vehicle is accelerated from the lowest stable vehicle speed corresponding to the gear to the vehicle speed corresponding to the rated engine speed corresponding to the 100% accelerator pedal opening degree, and in the test process, sound, the engine speed and vehicle speed signals in the vehicle are synchronously collected. The results of the under-vehicle sound test at 100% accelerator opening are shown in fig. 3, and the results of the engine speed test at 100% accelerator opening are shown in fig. 4.
And analyzing the sound data in the vehicle under the target setting reference vehicle acceleration running condition. Specifically, the collected vehicle interior sound data of the accelerated vehicle running under the condition of 100% of the opening degree of the accelerator pedal is subjected to discrete short-time fast fourier analysis tracking the engine speed, so as to obtain a vehicle interior sound frequency spectrum cloud chart of the accelerated vehicle running under the condition of 100% of the constant opening degree of the accelerator pedal, as shown in fig. 5.
FIG. 6 is a frequency spectrum cloud of the primary in-vehicle engine order sound during acceleration at 100% accelerator pedal opening; fig. 7 is a spectrum cloud of background sound in an original vehicle when the vehicle is accelerated at an accelerator pedal opening of 100%. On the basis, integral order and half order component sounds of the engine mainly in the frequency range of 20-1200Hz are extracted, and an in-vehicle background sound frequency spectrum with the engine order components removed is obtained, and the reference is made to the graph shown in FIGS. 6 and 7. And performing discrete Fourier transform to obtain time domain signals of the order component sound of the engine in the accelerated running vehicle and the background sound in the vehicle under the condition of 100% of the opening degree of an accelerator pedal, on the basis, performing total values of the original sound in the vehicle, the order component sound of the engine in the vehicle and the background sound in the vehicle for tracking the rotating speed of the engine, and calculating to obtain a third curve of the amplitude of the original sound in the vehicle, the amplitude of the order component sound of the engine in the vehicle and the amplitude of the background sound in the vehicle, which are changed along with the rotating speed of the engine, as shown in FIG. 8.
And setting a sound target of the active sound production system of the electric automobile under the acceleration running condition. Specifically, according to the sound amplitude variation curve in the accelerated running vehicle under the target reference vehicle 100% accelerator pedal opening degree obtained by analyzing in fig. 8, the target trend line fitting of each curve is performed, specifically:
firstly, fitting a dotted line shown in figure 9 by referring to a third curve of the sound amplitude of the engine order component in the vehicle, which changes along with the rotating speed of the engine, and taking the dotted line as a sound target trend line of the active sound production system of the electric vehicle under the acceleration running working condition.
And secondly, fitting a dot-dash line shown in the figure 9 by referring to a third curve of the background sound amplitude in the electric automobile changing along with the rotating speed of the engine, and taking the line as a sound target trend line of the original automobile in the electric automobile under the acceleration running condition.
And fitting a solid line shown in the figure 9 by referring to a third curve of the original sound amplitude in the electric automobile changing along with the rotating speed of the engine, and taking the line as a target trend line of the total sound value in the electric automobile under the acceleration running working condition.
The sound of the electric automobile active sound system during accelerated running is set according to the sound of the electric automobile active sound system, the original vehicle interior sound of the electric automobile and the total value of the vehicle interior sound, and the whole sound effect of the electric automobile with the active sound system can be comprehensively and comprehensively considered.
According to the original vehicle interior sound, the vehicle interior engine order sound and the vehicle interior background sound under the constant-speed running working condition of each designated vehicle speed of the target set reference vehicle, calculating to obtain a total value of the vehicle interior sound, a total value of the vehicle interior engine order sound, a total value of the vehicle interior background sound, and a sound pressure level difference value of the total value of the vehicle interior engine order sound and the vehicle interior background sound;
and obtaining the total value of the internal sound of the electric automobile, the total value of the sound of the active sound system and the target set value of the total value of the internal sound of the original automobile under the constant-speed running condition of the electric automobile according to a first curve of the virtual engine rotating speed of the active sound system changing along with the speed of the automobile and a target set reference vehicle under the constant-speed running typical working condition, the total value of the internal engine order sound, the total value of the internal background sound of the automobile and the sound pressure level difference value of the total value of the internal engine order sound and the total value of the internal background sound of the automobile.
Specifically, the target sets the sound collection and data analysis in the vehicle according to the constant-speed running condition of the reference vehicle. Specifically, on an outdoor horizontal and smooth asphalt pavement, the transmission is shifted to 3, the vehicle runs at a constant speed at corresponding vehicle speeds of 1000r/min, 2000r/min, 3000r/min, 4000r/min, 5000r/min and 6000r/min respectively, the acquisition time is not less than 10s, and the sound, the engine speed and the vehicle speed signals in the vehicle are acquired synchronously.
By adopting the above-mentioned method for extracting the engine order components, the in-vehicle engine order component sound and the background sound are separated at a constant speed at each vehicle speed, so as to calculate the total value of the in-vehicle sound, the total value of the in-vehicle engine order component sound, the total value of the in-vehicle background sound, and the sound pressure level difference between the in-vehicle engine order component sound and the in-vehicle background sound of the target setting reference vehicle at the constant speed at the vehicle speed, as shown in table 1 and fig. 10.
TABLE 1 target conventional automobile uniform speed running condition in-automobile sound test result
| Engine speed (r/min) | 1000 | 2000 | 3000 | 4000 | 5000 | 6000 |
| Corresponding vehicle speed (km/h) | 13.0 | 36.5 | 57.9 | 78.9 | 99.6 | 121.0 |
| Total value of sound in vehicle [ dB (A)] | 49.6 | 57.1 | 59.7 | 64.3 | 68.6 | 70.0 |
| In-vehicle engine order component sound [ dB (A)] | 42.7 | 50.9 | 54.1 | 59.4 | 64.4 | 66.4 |
| Background sound in vehicle [ dB (A)] | 48.6 | 55.9 | 58.3 | 62.6 | 66.5 | 67.5 |
| Engine order component sound to background sound difference [ dB (A)] | -5.9 | -5.0 | -4.2 | -3.2 | -2.1 | -1.1 |
And setting the sound target of the active sound production system of the electric automobile under the constant-speed running condition. Calculating the speed corresponding to each virtual engine rotating speed of the active sound production system of the electric automobile according to the formula (1), and performing target setting of the total value of the sound in the electric automobile, the total value of the sound of the active sound production system and the total value of the sound in the original automobile by combining the calculation result of the sound in the automobile when the target reference automobile runs at a constant speed and the amplitude relation between the sound of the order component of the engine in the automobile and the background sound in the automobile, which are obtained by analyzing the table 1, the graph 10 and the graph 11, as shown in the graph 12; the difference target between the sound of the active sound system of the electric automobile and the sound in the original automobile is shown in fig. 13.
In order to better understand the process of setting the sound target in the active sounding vehicle of the electric vehicle under the constant-speed driving condition, the following specific example is shown.
Firstly, for the original car interior sound of the electric car, the car interior sound amplitude of each virtual engine rotating speed corresponding to the car speed is tested and calculated, as shown in table 2, the car interior sound amplitude is further compared with the target reference car interior background sound, and the target achievement condition of the original car interior sound of the electric car is determined, as shown in fig. 14.
TABLE 2 test results of sound in electric vehicle running at uniform speed
| Virtual engine speed (r/min) | 1000 | 2000 | 3000 | 4000 | 5000 | 6000 |
| Vehicle speed (km/h) | 5.7 | 28.6 | 51.4 | 74.3 | 97.1 | 120.0 |
| Total value of sound in vehicle [ dB (A)] | 44.0 | 55.6 | 61.5 | 62.6 | 65.2 | 68.0 |
Secondly, according to the calculated result of the in-vehicle sound of the constant-speed running of the target reference vehicle and the amplitude relation between the order component sound of the in-vehicle engine and the background sound, which are obtained by analyzing the results in the table 1, the graph 10 and the graph 11, the sound amplitude of the active sound production system of the electric vehicle and the target of the total in-vehicle sound value are set under the constant-speed running condition, as shown in the table 3 and the graph 15, wherein the dotted line in the graph is the sound amplitude target of the active sound production system of the electric vehicle under the constant-speed running condition, and the dot line is the target of the total in-vehicle sound value of the electric vehicle under the constant-speed running condition.
TABLE 3 Total sound value in the electric vehicle during uniform speed running and target sound amplitude setting of the active sound production system
| Virtual engine speed (r/min) | 1000 | 2000 | 3000 | 4000 | 5000 | 6000 |
| Vehicle speed (km/h) | 5.7 | 28.6 | 51.4 | 74.3 | 97.1 | 120.0 |
| Total value target of sound in vehicle [ dB (A)] | 45.0 | 56.8 | 62.9 | 64.3 | 67.3 | 70.5 |
| Active sounding system target [ dB (A)] | 38.1 | 50.6 | 57.3 | 59.4 | 63.1 | 66.9 |
| Total value of original sound in vehicle [ dB (A)] | 44.0 | 55.6 | 61.5 | 62.6 | 65.2 | 68.0 |
In the development process of the active sound production system, product positioning and target sales groups of the carried electric automobile need to be considered, meanwhile, the relative amplitude relation between engine order component sound generated by the active sound production system and original automobile background sound under the actual automobile condition is considered, objective acoustic parameter indexes under the driving condition under typical working conditions are reasonably formulated according to the target reference automobile interior sound, the automobile engine order component sound and the automobile interior background sound, and therefore the sound generated by the active sound production system cannot cause complaints of users due to overlarge amplitude, and driving enthusiasm and pleasure cannot be weakened due to undersize amplitude.
The embodiment also discloses an active sound production system, which comprises the sound target setting method of the active sound production system. According to the active sound system sound target setting method of the active sound system, the core competitive product vehicle type with the sound quality characteristics in the electric vehicle can be selected as the target setting reference vehicle according to the vehicle type positioning of the electric vehicle to be carried with the active sound system and the preference of a target sales group, and the sound target setting of the active sound system of the electric vehicle can be purposefully carried out aiming at the target sales group.
In order to facilitate the sound target setting of the electric automobile active sound production system, a concept of virtual engine rotating speed is provided, the speed of the automobile is connected with the sound frequency of the active sound production system through the parameter, and the sound target setting of the electric automobile active sound production system can be effectively carried out according to the test result of the target reference automobile interior sound. On the basis, according to a relation curve of the virtual engine speed of the active sound production system of the electric automobile and the vehicle speed, selecting an accelerated running working condition under a gear position of the engine speed change curve closest to the speed change curve from engine speed change curves of all gear positions of a target reference vehicle as a typical working condition under the accelerated running condition of the target reference vehicle, wherein the sound of the active sound production system and the sound of the engine order in the target reference vehicle are in one-to-one correspondence from the basic frequency and the sound amplitude setting because the virtual engine speed of the active sound production system of the electric automobile is equal to the engine speed of the target reference vehicle; meanwhile, in the whole range of the engine speed change interval, under the condition of the same engine speed, the speed of the electric automobile is basically consistent with that of the target reference vehicle, so that the target setting of the total sound in the electric automobile and the background sound in the original automobile can be carried out according to the sound in the target reference vehicle and the background sound under the same speed. On the contrary, if other gear working conditions of the target reference vehicle are selected to perform in-vehicle sound target setting of the electric vehicle, under the condition of the virtual engine speed and the engine speed with equal values, the speed of the electric vehicle is greatly different from that of the target reference vehicle, and because the amplitude of the background sound in the electric vehicle and the target reference vehicle is closely related to the speed of the electric vehicle, the in-vehicle sound of the electric vehicle cannot perform target setting according to the in-vehicle background sound of the target reference vehicle.
The method comprises the steps of further collecting and analyzing the sound in a vehicle of a target reference vehicle under typical working conditions, extracting the order sound of an engine in the vehicle and the background sound in the vehicle, then calculating the original sound amplitude in the vehicle, the sound amplitude of the order component of the engine in the vehicle and the background sound amplitude in the vehicle, and setting the sound of the active sound system of the electric vehicle during accelerated running according to the total sound value in the electric vehicle, the total sound value of the active sound system and the total sound value of the original vehicle in the vehicle, so that the whole sound effect of the electric vehicle with the active sound system can be comprehensively considered. The method provided by the invention has the advantages that the sound target requirement of the market on the active sound production system of the electric automobile is considered, the driving behaviors with different working conditions of accelerated driving and uniform speed driving can be considered according to the in-vehicle sound of the target reference vehicle, the sound target setting of the active sound production system of the electric automobile is reasonably carried out, and the expectation of the market and target sales groups on the sound of the active sound production system is met.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (4)
1. A sound target setting method of an active sound production system is characterized by comprising the following steps:
for the acceleration running condition, obtaining a gear of a typical acceleration running condition of the target setting reference vehicle, specifically:
aiming at the electric automobile, defining the virtual engine speed of an active sound production system, defining the speed interval of the active sound production in the electric automobile within the range of 0-120km/h, and defining the virtual engine speed nvEqual to the virtual engine speed variation A multiplied by the vehicle speed V and then added to the virtual engine idle speed nI(ii) a Calculating according to the formula to obtain a first curve of the virtual engine rotating speed of the active sound generating system along with the change of the vehicle speed in the sound generating vehicle speed interval of the active sound generating system of the electric vehicle;
wherein the virtual engine speed variation A is equal to the virtual engine rated speed nRAnd the virtual engine idling speed is rotated by nIThe difference of (d) divided by 120;
setting a reference vehicle according to a target, performing accelerated running operation at 100% of accelerator pedal opening degree under different transmission gears respectively, so that the vehicle is accelerated from the lowest stable vehicle speed corresponding to the gear to the vehicle speed corresponding to the rated engine speed, synchronously acquiring data of the vehicle speed and the engine speed in the accelerated running process under the 100% of accelerator pedal opening degree of each gear, and drawing a second curve of the relation between the accelerated running vehicle speed and the engine speed under each gear;
selecting a gear closest to the first curve as a target to set a typical acceleration running condition of the reference vehicle;
setting a reference vehicle according to a target, and obtaining a third curve of the original sound amplitude in the vehicle, the sound amplitude of the order component of the engine in the vehicle and the sound amplitude of the background sound in the vehicle which are changed along with the rotating speed of the engine under a typical acceleration running working condition;
fitting each third curve to obtain a total sound value target trend line in the electric automobile, a sound target trend line of an active sound production system of the electric automobile and an original sound target trend line in the electric automobile under the acceleration running working condition;
for the constant-speed running working condition, a reference vehicle is set aiming at a target, and a sound spectrum cloud picture in the constant-speed running vehicle at different speeds is obtained, which specifically comprises the following steps:
under the gear of a typical acceleration running working condition, the opening of an acceleration pedal is fixed at 100% opening for acceleration running, in-vehicle sound, engine rotating speed and vehicle speed signals are collected, a discrete short-time fast Fourier analysis is carried out on the collected signals to obtain an in-vehicle sound frequency spectrum cloud picture of acceleration running under 100% opening of the acceleration pedal, and an in-vehicle engine order sound frequency spectrum cloud picture and an in-vehicle background sound frequency spectrum cloud picture are extracted and obtained;
and separating the order component sound of the engine in the constant-speed running vehicle from the background sound at each vehicle speed, and calculating to obtain the target set values of the total sound value in the electric vehicle, the total sound value of the active sound system and the total sound value in the original vehicle under the typical working condition of constant-speed running.
2. The active sound generation system sound target setting method according to claim 1, wherein a time domain signal of the in-vehicle engine order component sound and the in-vehicle background sound under the accelerated driving condition is obtained by performing discrete fourier transform synthesis on the extracted in-vehicle engine order component sound spectrum and the in-vehicle background sound spectrum, and on the basis of the time domain signal, a total value calculation of the in-vehicle original sound, the in-vehicle engine order component sound and the in-vehicle background sound is performed to track the engine speed, so that a third curve of the in-vehicle original sound amplitude, the in-vehicle engine order component sound amplitude and the in-vehicle background sound amplitude changing with the engine speed is obtained.
3. The sound target setting method of the active sound production system according to claim 1, wherein a sound pressure level difference value of a target setting reference vehicle in-vehicle sound total value, an in-vehicle engine order sound total value, an in-vehicle background sound total value, an in-vehicle engine order sound total value and an in-vehicle background sound total value is calculated according to an in-vehicle engine order sound and an in-vehicle background sound under each specified vehicle speed constant speed running condition;
and obtaining the total value of the internal sound of the electric automobile, the total value of the sound of the active sound system and the target set value of the total value of the internal sound of the original automobile under the constant-speed running condition of the electric automobile according to a first curve of the virtual engine rotating speed of the active sound system changing along with the speed of the automobile and a target set reference vehicle under the constant-speed running typical working condition, the total value of the internal engine order sound, the total value of the internal background sound of the automobile and the sound pressure level difference value of the total value of the internal engine order sound and the total value of the internal background sound of the automobile.
4. An active sound production system comprising the active sound production system sound target setting method according to any one of claims 1 to 3.
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| CN111751119B (en) * | 2020-06-10 | 2022-11-11 | 中国第一汽车股份有限公司 | Automobile acceleration sound quality evaluation method based on sound order frequency characteristics |
| CN111695204B (en) * | 2020-06-30 | 2022-07-08 | 重庆长安汽车股份有限公司 | Compensation method for working condition identification based on order rendering |
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