WO2018184434A1

WO2018184434A1 - New energy vehicle, and active noise reduction method and system thereof

Info

Publication number: WO2018184434A1
Application number: PCT/CN2018/077696
Authority: WO
Inventors: 赵永吉; 孙亚轩; 赵波; 周晓军
Original assignee: 比亚迪股份有限公司
Priority date: 2017-04-07
Filing date: 2018-03-01
Publication date: 2018-10-11
Also published as: CN108694935B; CN108694935A

Abstract

A new energy vehicle, and an active noise reduction method and system thereof. The method comprises: acquiring operating parameters of a new energy vehicle, and obtaining, according to the operating parameters, the frequency of an in-vehicle ambient noise signal associated with the operating parameters (S101), wherein the operating parameters comprise at least a motor rotating speed of the new energy vehicle, and the motor rotational speed corresponds to the frequency of the in-vehicle ambient noise signal; searching, according to the frequency of the in-vehicle ambient noise signal, a preconfigured generated-sound database to obtain a generated-sound signal corresponding to the in-vehicle ambient noise signal (S102); and controlling a sound playback module in the new energy vehicle to output the generated-sound signal, wherein the generated-sound signal is combined with the in-vehicle ambient noise signal to reduce noise in an in-vehicle environment (S103). The active noise reduction method is easily implemented and operated and is easily used by a user.

Description

New energy vehicle and active noise reduction method and system thereof

This application claims priority to Chinese Patent Application No. 201710224655.0, entitled "New Energy Vehicle and Active Noise Reduction Method, System", filed on April 7, 2017, the entire contents of which are incorporated by reference. In this application.

Technical field

The invention relates to the technical field of noise control, in particular to an active noise reduction method for a new energy vehicle, an active noise reduction system for a new energy vehicle and a new energy vehicle.

Background technique

The sound quality problem has become a new NVH (Noise Vibration and Harshness) problem in the automotive industry. Especially for new energy vehicles, the sound quality problem is more important because there is no masking of the engine sound and the noise of the motor is even more Prominent, and the sound signal of the motor is generally sharp, which will bring great trouble to the user.

At present, the noise reduction methods in the automotive field mainly include: (1) physical noise reduction, which refers to the use of traditional materials with sound insulation, sound absorption and damping characteristics to isolate, absorb, and wrap noise and noise sources to achieve noise reduction. (2) ANC (Active Noise Control) technology to reduce noise, that is, to generate a reverse sound signal to cancel the noise signal to achieve the purpose of noise reduction; (3) masking effect noise reduction, ie A sound with a lower hearing threshold is used to mask the noise signal to optimize the quality of the acoustic environment.

However, although the physical noise reduction technology can achieve a certain noise reduction effect, the physical noise reduction can only be limited by the limitation of the interior space, the special-shaped structure and the heat dissipation index, especially for the motor noise, and it is impossible to do too much on the motor side. Packaging process; ANC technology has a certain elimination effect on low frequency signals, and is ineffective for high frequency; a problem of masking effect is the problem of sound pressure level of masking acoustic signal, when masking sound signal can mask high frequency motor signal At the same time, its sound pressure level is much higher than the inherent sound pressure level of the original environment.

Summary of the invention

The present invention aims to solve at least one of the technical problems in the above-mentioned techniques to some extent. To this end, the first object of the present invention is to propose an active noise reduction method for a new energy vehicle. The method can realize the noise reduction effect of the environmental noise in the new energy vehicle, and the operation is simple and convenient for the user to use.

A second object of the present invention is to provide an active noise reduction system for a new energy vehicle.

A third object of the present invention is to propose a new energy vehicle.

In order to achieve the above object, an embodiment of the first aspect of the present invention provides an active noise reduction method for a new energy vehicle, comprising the steps of: collecting operating parameters of the new energy vehicle, and acquiring and operating according to the operating parameter. a frequency of the in-vehicle ambient noise signal associated with the parameter, wherein the operating parameter includes at least a motor speed of the new energy vehicle; and a preset constructed sound database is acquired according to the frequency of the in-vehicle ambient noise signal to obtain Constructing a sound signal corresponding to the in-vehicle ambient noise signal; controlling a sound playing module disposed on the new energy vehicle to output the structured sound signal, and performing the constructed sound signal and the in-vehicle ambient noise signal Convergence to reduce noise in the interior of the car.

An active noise reduction method for a new energy vehicle according to an embodiment of the present invention acquires an operating parameter of a new energy vehicle, acquires a frequency of an in-vehicle environmental noise signal corresponding to the operating parameter, and invokes a preset constructed sound database to obtain and The sound signal corresponding to the ambient noise signal in the vehicle is controlled, and then the sound playing module outputs the structural sound signal, thereby realizing the noise reduction processing of the interior environment by synthesizing the sound signal and the ambient noise signal in the vehicle. The method is easy to implement, simple to operate, and convenient for the user to use.

In addition, the active noise reduction method of the new energy vehicle according to the above embodiment of the present invention may further have the following additional technical features:

According to an embodiment of the invention, the acquisition of the operating parameters is achieved by reading data information transmitted by the CAN bus of the new energy vehicle.

According to an embodiment of the present invention, the constructing sound signal corresponding to the in-vehicle ambient noise signal is obtained by calling a preset configuration sound database according to the frequency of the in-vehicle environmental noise signal, including: according to the inside of the vehicle The frequency of the ambient noise signal is used to determine the frequency band of the ambient noise signal in the vehicle; the preset structured sound database is called according to the frequency band of the in-vehicle environmental noise signal to acquire the belonging to the ambient noise signal of the vehicle And a plurality of constructed sound samples are stored in the preset structured sound database, each constructed sound sample corresponding to a noise frequency band, and includes a structured sound signal corresponding to the noise frequency band.

According to an embodiment of the present invention, the preset construction sound database construction process includes: collecting operating parameters of the new energy vehicle and noise of the vehicle interior environment under different working conditions; and performing noise on the interior environment of the vehicle Performing spectrum analysis to obtain noise spectrum feature information associated with the operating parameter, and establishing a correspondence between the operating parameter and noise of the vehicle interior environment according to the noise spectrum feature information; according to the noise spectrum feature The information is divided into frequency bands of the noise of the vehicle environment under different working conditions to obtain noise signals of multiple frequency bands; the noise signal of any frequency band is selected, and the frequency of the noise signal of the selected frequency band is performed according to the musical acoustic or psychoacoustic principle. Constructing to generate a plurality of structured sound signals; respectively synthesizing the noise signals of the selected frequency bands with each of the constructed sound signals to generate and output a plurality of synthesized sound samples, wherein the frequency band of each of the synthesized sound samples includes a frequency band of the selected noise signal; each synthesized sound sample is scored according to a preset evaluation method And acquires the selected frequency band according to a rating result for each sample of the synthesized sound signal corresponding to a noise sound sample configuration.

According to one embodiment of the invention, the acquisition of noise in the interior environment of the vehicle is achieved by detecting noise generated by the motor.

According to an embodiment of the invention, the sound pressure level of the constructed sound signal is less than or equal to the sound pressure level of the noise signal of the selected frequency band.

In order to achieve the above object, an embodiment of the second aspect of the present invention provides an active noise reduction system for a new energy vehicle, comprising: an acquisition module, configured to collect operating parameters of the new energy vehicle, wherein the operating parameters include at least a motor speed of the new energy vehicle; a first acquisition module, configured to acquire a frequency of an in-vehicle environmental noise signal associated with the operating parameter according to the operating parameter; and a second acquiring module, configured to be used according to the vehicle The frequency of the environmental noise signal is obtained by calling a preset constructed sound database to acquire a structured sound signal corresponding to the in-vehicle ambient noise signal; a sound playing module disposed on the new energy vehicle; and a control module for controlling the The sound playing module outputs the constructed sound signal, and fuses with the interior environmental noise signal by the constructed sound signal to perform noise reduction processing on the interior environment.

The active noise reduction system of the new energy vehicle of the embodiment of the present invention collects the operating parameters of the new energy vehicle through the acquisition module, and acquires the frequency of the environmental noise signal of the vehicle corresponding to the operating parameter through the first obtaining module, and obtains the frequency through the second acquisition The module calls a preset constructed sound database to acquire a structured sound signal corresponding to the ambient noise signal in the vehicle, and then controls the sound playing module to output a structured sound signal through the control module, thereby performing the sound signal and the ambient noise signal in the vehicle. The fusion can realize the noise reduction treatment of the interior environment. And the system is easy to implement, simple to operate, and less restrictive.

In addition, the active noise reduction system of the new energy vehicle according to the above embodiment of the present invention may further have the following additional technical features:

According to an embodiment of the present invention, the second obtaining module includes: a determining unit, configured to determine, according to a frequency of the in-vehicle environmental noise signal, a frequency band to which the in-vehicle environmental noise signal belongs; and a calling module, configured to The preset frequency domain of the in-vehicle ambient noise signal is used to call the preset structured sound database to acquire a structured sound signal corresponding to the frequency band of the in-vehicle environmental noise signal, wherein the preset structured sound database A plurality of constructed sound samples are stored, each constructed sound sample corresponding to a noise frequency band, and includes a structured sound signal corresponding to the noise frequency band.

According to an embodiment of the present invention, the preset construction sound database construction process includes: collecting operating parameters of the new energy vehicle and noise of the vehicle interior environment under different working conditions; and performing noise on the interior environment of the vehicle Performing spectrum analysis to obtain noise spectrum feature information associated with the operating parameter, and establishing a correspondence between the operating parameter and noise of the vehicle interior environment according to the noise spectrum feature information; according to the noise spectrum feature The information is divided into frequency bands of the noise of the vehicle environment under different working conditions to obtain noise signals of multiple frequency bands; the noise signal of any frequency band is selected, and the frequency of the noise signal of the selected frequency band is performed according to the musical acoustic or psychoacoustic principle. Constructing to generate a plurality of structured sound signals; respectively synthesizing the noise signals of the selected frequency bands with each of the constructed sound signals to generate and output a plurality of synthesized sound samples, wherein the frequency band of each of the synthesized sound samples includes a frequency band of the selected noise signal; each synthesized sound sample is scored according to a preset evaluation method And acquiring a constructed sound sample corresponding to the noise signal of the selected frequency band according to the scoring result of each synthesized sound sample.

Further, the present invention proposes a new energy vehicle including the above-described active noise reduction system for a new energy vehicle.

The new energy vehicle of the embodiment of the present invention can realize the active noise reduction effect of the environmental noise signal in the vehicle by adopting the active noise reduction system of the above new energy vehicle, and is easy to implement and convenient for the user to use.

DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

1 is a flow chart of an active noise reduction method for a new energy vehicle in accordance with an embodiment of the present invention;

2 is a flow chart showing the construction of constructing a sound database in accordance with one embodiment of the present invention;

3 is a frequency spectrum diagram of a noise signal generated by a motor of an example new energy vehicle;

Figure 4 is a spectrum diagram of an example of music;

5 is a structural block diagram of an active noise reduction system of a new energy vehicle according to an embodiment of the present invention;

6 is a block diagram showing the structure of an active noise reduction system for a new energy vehicle according to an embodiment of the present invention;

7 is a block diagram showing the structure of a new energy vehicle according to an embodiment of the present invention.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

A new energy vehicle and an active noise reduction method and system thereof according to an embodiment of the present invention are described below with reference to the accompanying drawings.

1 is a flow chart of an active noise reduction method for a new energy vehicle in accordance with one embodiment of the present invention. As shown in FIG. 1, the active noise reduction method includes the following steps:

S101: Collect operating parameters of the new energy vehicle, and obtain a frequency of the ambient noise signal of the vehicle associated with the operating parameter according to the operating parameter.

The operating parameters include at least the motor speed of the new energy vehicle, and the motor speed is corresponding to the frequency of the ambient noise signal in the vehicle.

In an embodiment of the invention, the acquisition of operational parameters may be accomplished by reading data information transmitted by the CAN bus of the new energy vehicle. Optionally, the operating parameters of the new energy vehicle may also include the speed of the new energy vehicle, the throttle opening, and the like.

Specifically, the relationship between the motor rotation speed and the frequency of the in-vehicle environmental noise signal can be stored in advance. When collecting operating parameters, the CAN bus system of the new energy vehicle can be connected, and the operating parameters such as the motor speed, the vehicle speed, and the throttle opening can be obtained by reading the data transmitted by the CAN bus of the new energy vehicle. Furthermore, the relationship between the pre-stored motor speed and the frequency of the ambient noise signal in the vehicle can be obtained through the CAN bus, and the corresponding ambient noise frequency of the vehicle can be obtained from the motor speed.

S102. Acquire a constructed sound signal corresponding to the in-vehicle ambient noise signal by calling a preset constructed sound database according to the frequency of the in-vehicle environmental noise signal.

Specifically, the preset structured sound database may be pre-established and stored. After obtaining the frequency of the in-vehicle environmental noise signal, the preset structured sound database may be called through the CAN bus to obtain a structure corresponding to the interior environmental noise signal. Sound signal.

S103. Control a sound playing module disposed on the new energy vehicle to output a structural sound signal, and perform a noise reduction process on the interior environment by combining the sound signal with the in-vehicle environmental noise signal.

It should be noted that the sound playing module is preferably disposed at the motor end of the new energy vehicle, that is, the noise source, thereby ensuring that the sound signal and the ambient noise signal in the vehicle are in the same way, and the structural sound signal is eliminated during the propagation process. Uncertain factors such as attenuation, improve the noise reduction effect of the built-in environment after the structural sound signal is combined with the ambient noise signal.

The active noise reduction method of the new energy vehicle collects the operating parameters of the new energy vehicle through the CAN bus, and performs two data readings through the CAN bus to obtain a corresponding structured sound signal, thereby controlling the output structure of the sound playing module disposed at the motor end. The sound signal can be denoised by the structure of the sound signal and the ambient noise signal in the vehicle. The method is easy to implement, simple to operate, and limited in limitation. In addition, the method utilizes the CAN bus to obtain the required data, making the data objective and accurate, and more intuitive.

In an embodiment of the present invention, the step S102 may specifically include: determining a frequency band of the ambient noise signal in the vehicle according to the frequency of the ambient noise signal in the vehicle; and calling the preset structured sound database according to the frequency band of the ambient noise signal in the vehicle. Obtaining a structured sound signal corresponding to a frequency band to which the ambient noise signal of the vehicle is located, wherein the preset structured sound database stores a plurality of constructed sound samples, each of the constructed sound samples corresponding to a noise frequency band, and includes A sound signal corresponding to the noise band.

Specifically, in an example, if the frequency of the ambient noise signal in the vehicle is 4000-5000 Hz, that is, a high-frequency signal, a preset constructed sound database can be called through the CAN bus, from which the high-frequency signal can be acquired. Corresponding constructed sound signals, such as low frequency constructed sound signals of 600-1000 Hz.

It should be noted that, before performing the above steps S101-S103, it is necessary to construct a preset structured sound database in advance. In an embodiment of the present invention, as shown in FIG. 2, the process of constructing the preset structured sound database includes:

S201, collecting the operating parameters of the new energy vehicle and the noise of the interior environment under different working conditions.

In one embodiment of the invention, the acquisition of noise from the interior environment of the vehicle can be achieved by detecting noise generated by the motor. It can be understood that when the new energy vehicle is driving, its motor will generate noise, including mechanical noise, electromagnetic noise, air noise, etc., the frequency is from 1KHz to 12KHz or higher, and this high-frequency noise will bring strong people. Discomfort. Therefore, the management of such high frequency noise is very necessary.

Specifically, the noise generated by the motor can be collected in real time by a sound signal receiver such as a microphone or the like and/or a rotational speed sensor. For motors with relatively constant load, only the speed sensor can be used to collect noise. For motors with large load changes, noise can be collected simultaneously by the speed sensor and the sound signal receiver to improve the noise collection accuracy.

It should be noted that the signal acquisition of the noise of the vehicle interior environment can be directly collected at the motor end, thereby ensuring the integrity of the noise generated by the motor and eliminating the uncertainties such as the attenuation generated by the noise during the propagation process.

S202. Perform spectrum analysis on noise of the vehicle environment to obtain noise spectrum feature information associated with the operating parameter, and establish a correspondence between the operating parameter and the noise of the vehicle environment according to the noise spectrum feature information.

Specifically, the operating parameter is taken as an example of the motor speed. Under different working conditions, the motor speed of the new energy vehicle and the indoor environmental noise corresponding to the motor speed can be collected; then the frequency domain analysis of the collected interior environmental noise can be performed by the spectrum analyzer to obtain the interior environment of the vehicle. The spectral characteristic information of the noise, such as the frequency and the sound pressure level; and the corresponding relationship between the motor speed and the noise frequency and sound pressure level of the interior environment.

S203. Perform frequency band division on noise of the vehicle environment under different working conditions according to the noise spectrum characteristic information to obtain noise signals of multiple frequency bands.

Specifically, the noise frequency of the interior environment can be divided into high frequency, low frequency, constant frequency, frequency conversion, etc. according to the motor speed. It can be understood that when the motor speed is large, it can be corresponding to high frequency noise; when the motor speed is small, it can be corresponding to low frequency noise; when the motor speed changes little, that is, when it is basically constant, it can be corresponding to constant frequency noise; the motor speed is gradually increased. That is, when there is acceleration and the acceleration is greater than a certain value, it may be corresponding to the variable frequency noise.

Among them, the frequency band division of the noise of the interior environment is to save the workload when the frequency structure is performed. For example, high-frequency components in the ambient noise of the vehicle may have a strong sharpness, and a low-frequency component may be appropriately added in the frequency structure to increase a large number of intermediate frequency components.

For example, the frequency of the ambient noise in the vehicle is a high frequency, such as 3000-6000 Hz, and a sound of 600-1000 Hz can be constructed to be added to the high frequency noise.

S204: Select a noise signal of any frequency band, and perform frequency configuration on the noise signal of the selected frequency band according to a musical acoustic or psychoacoustic principle to generate a plurality of structured sound signals.

Specifically, for a noise signal of any frequency band, the noise signal of the frequency band can be frequency-structured using sound processing software (such as MATLAB) according to musical acoustic or psychoacoustic principles to generate a plurality of structured sound signals.

S205. Synthesize a noise signal of the selected frequency band with each of the constructed sound signals to generate a plurality of synthesized sound samples and output the same.

Wherein, the frequency band of each synthesized sound sample belongs to the selected frequency band. For example, for the noise signal in the 4000-5000 Hz band, the frequency structure is used to obtain the low-frequency signal in the 400-500 Hz band, and the frequency of the synthesized sound sample obtained by the combination of the two can be 400-6000 Hz, visible, 400-6000 Hz band. Includes the 4000-5000Hz band. Thus, by constructing the sound signal, the frequency of the noise signal of the selected frequency band can be compensated, that is, the frequency coverage of the synthesized sound sample is wide.

It should be noted that, in the embodiment of the present invention, the sound pressure level of the constructed sound signal is less than or equal to the sound pressure level of the noise signal of the selected frequency band, thereby synthesizing the sound signal and the noise signal of the selected frequency band after synthesizing The sound pressure level of the constructed sound signal has less influence on the sound pressure level of the generated synthesized sound sample. It can be understood that when the sound pressure level of the sound signal is smaller than the sound pressure level of the noise signal of the selected frequency band, the difference between the sound pressure level of the sound signal and the sound pressure level of the noise signal of the selected frequency band is larger, and the sound is constructed. The effect of the sound pressure level of the signal on the sound pressure level of the resulting synthesized sound sample is smaller.

S206. Rate each synthesized sound sample according to a preset evaluation method, and acquire a constructed sound sample corresponding to the noise signal of the selected frequency band according to the score result of each synthesized sound sample.

The preset evaluation method may include: 1) determining an evaluator, the evaluator should have normal hearing, and may be a general staff member, the number of people may be required to be more than 10; 2) the scoring standard may be scored by a percentage system, and Use five-level evaluation criteria, such as: excellent: very pleasant (eg, sounds comfortable, calm, pleasant) (80-100 points), good: sweet (60-80 points), medium: generally 40-60 points) Poor: ugly (20-40 points), inferior: difficult to listen to (eg, unpleasant, disturbing, irritating, etc.) (0-20 points), that is, the evaluator can perform a percentage system based on the rating evaluation; 3) Audition conditions, such as audition evaluation in a quieter indoor environment.

For example, an evaluation evaluator consisting of 10 male and female adults plays each synthesized sound sample corresponding to the selected frequency band in a relatively quiet indoor environment, and each synthesized sound sample can be played 3 times. After playing 3 times, the scores are scored by 20 evaluators. After the score is completed, the score results are mathematically counted to select the synthesized sound samples with the highest score (for example, the highest average score), and the corresponding sound samples are constructed correspondingly. The sound sample acts as a constructed sound sample corresponding to the noise signal of the selected frequency band. Similarly, the constructed sound samples corresponding to the noise signals of each frequency band can be obtained, and the set of all constructed sound samples is the preset constructed sound database.

In order to facilitate understanding of the improvement of the sound quality of the new energy vehicle by the frequency structure of the above embodiment of the present invention, it can be described with reference to FIG. 3 and FIG. 4;

Figure 3 is a frequency spectrum diagram of the sound signal generated by the rotation of the motor of a new energy vehicle recorded on the gantry. As shown in Fig. 3, the frequency of the noise signal generated by the motor of the new energy vehicle is relatively simple, mainly concentrated below 1000 Hz and 4000-5000 Hz, and the frequency component causing people's irritability is the 4000-5000 Hz oblique line portion in Fig. 3. Corresponding change frequency, and this frequency band corresponds to the process of generating acceleration by motor rotation.

Figure 4 is a spectrum diagram of the music "City of the Sky." As shown in FIG. 4, the frequency component of the music spreads over the entire frequency domain, and the music rhythm is soothing, the sound is clean and pleasant.

Therefore, the spectrum of the noise signal generated by the motor shown in FIG. 3 can be constructed to obtain a sound similar to that shown in FIG. 4 even if the sound heard by the human ear (ie, the sound signal is combined with the noise signal generated by the motor). The spectrum of the sound) covers the entire frequency domain.

In summary, the active noise reduction method of the new energy vehicle according to the embodiment of the present invention establishes a functional relationship between the operating parameters of the new energy vehicle and the frequency of the environmental noise signal in the vehicle, and the frequency and structural sound signal of the ambient noise signal in the vehicle. The relationship between the two is good; the operating parameters of the new energy vehicle are collected through the CAN bus, and the frequency of the ambient noise signal in the vehicle and the structural sound signal corresponding to the frequency are obtained, thereby improving the objective accuracy of the data, and then constructing The sound signal is integrated with the ambient noise signal in the vehicle to achieve noise reduction processing in the vehicle interior environment. The method is easy to implement, simple to operate, and convenient for users to use.

FIG. 5 is a structural block diagram of an active noise reduction system of a new energy vehicle according to an embodiment of the present invention. As shown in FIG. 5, the active noise reduction system includes: an acquisition module 10, a first acquisition module 20, a second acquisition module 30, a sound playback module 40, and a control module 50.

The collection module 10 is configured to collect operating parameters of the new energy vehicle, wherein the operating parameters include at least the motor speed of the new energy vehicle. The first obtaining module 20 is configured to obtain a frequency of the in-vehicle environmental noise signal associated with the operating parameter according to the operating parameter, wherein the motor speed is corresponding to the frequency of the in-vehicle ambient noise signal. The second obtaining module 30 is configured to acquire a structured sound signal corresponding to the in-vehicle ambient noise signal by calling a preset constructed sound database according to the frequency of the in-vehicle ambient noise signal. The control module 50 is configured to control the sound playing module 40 to output a structured sound signal, and fuse the constructed sound signal with the in-vehicle ambient noise signal to perform noise reduction processing on the interior environment.

In an embodiment of the invention, the acquisition of operational parameters may be accomplished by reading data information transmitted by the CAN bus of the new energy vehicle.

Optionally, the operating parameters of the new energy vehicle may also include the speed of the new energy vehicle, the throttle opening, and the like.

Moreover, the preset structured sound database may be pre-established and stored. After obtaining the frequency of the ambient noise signal in the vehicle, the preset structured sound database may be called through the CAN bus, and the constructed sound corresponding to the interior environmental noise signal is obtained therefrom. signal.

It should be noted that the sound playing module 40 is preferably disposed at the motor end of the new energy vehicle, that is, at the noise source, thereby ensuring the same path of constructing the sound signal and the ambient noise signal in the vehicle, and eliminating the structural sound signal during the propagation process. Uncertain factors such as attenuation are generated to improve the noise reduction effect of the built-in environment after the structural sound signal is combined with the ambient noise signal.

In an embodiment of the present invention, as shown in FIG. 6, the second obtaining module 30 includes a determining unit 31 and a calling unit 32.

The determining unit 31 is configured to determine a frequency band to which the ambient noise signal of the vehicle belongs according to the frequency of the ambient noise signal in the vehicle. The calling module 32 is configured to call a preset structured sound database according to the frequency band to which the ambient noise signal of the vehicle is located, to obtain a structured sound signal corresponding to the frequency band to which the ambient noise signal of the vehicle is located, wherein the preset structured sound database is stored. There are a plurality of constructed sound samples, each constructed sound sample corresponding to a noise band, and including a constructed sound signal corresponding to the noise band.

Specifically, in an example, if the frequency of the ambient noise signal in the vehicle is 4000-5000 Hz, that is, a high-frequency signal, the calling module 32 can call a preset constructed sound database through the CAN bus, from which the The high-frequency signal corresponds to a constructed sound signal, such as a low-frequency structured sound signal of 600-1000 Hz.

In an embodiment of the present invention, as shown in FIG. 2, the preset construction sound database construction process includes: collecting operating parameters of the new energy vehicle and noise of the vehicle environment under different working conditions; noise to the interior environment of the vehicle Performing spectrum analysis to obtain noise spectrum feature information associated with the operating parameters, and establishing a correspondence relationship between the operating parameters and the noise of the vehicle environment according to the noise spectrum feature information; and the vehicle interior environment under different working conditions according to the noise spectrum characteristic information The noise is divided into frequency bands to obtain noise signals of multiple frequency bands; the noise signals of any frequency band are selected, and the noise signals of the selected frequency bands are frequency-structured according to musical acoustic or psychoacoustic principles to generate a plurality of constructed sound signals; The noise signals of the selected frequency band are separately synthesized with each of the constructed sound signals to generate and output a plurality of synthesized sound samples; each synthesized sound sample is scored according to a preset evaluation method, and is obtained according to the score result of each synthesized sound sample. A constructed sound sample corresponding to the noise signal of the selected frequency band.

Specifically, the noise generated by the motor can be detected to detect the noise of the environment inside the vehicle. It can be understood that when the new energy vehicle is driving, its motor will generate noise, including mechanical noise, electromagnetic noise, air noise, etc., the frequency is from 1KHz to 12KHz or higher, and this high-frequency noise will bring strong people. Discomfort. Therefore, the management of such high frequency noise is very necessary.

In some examples, the noise generated by the motor can be acquired in real time by a sound signal receiver (such as a microphone, etc.) and/or a rotational speed sensor. For motors with relatively constant load, only the speed sensor can be used to collect noise. For motors with large load changes, the noise can be collected simultaneously by the speed sensor and the sound signal receiver to improve the noise collection accuracy.

In an embodiment of the invention, the noise frequency of the interior environment can be divided into high frequency, low frequency, constant frequency, frequency conversion, etc. according to the motor speed. It can be understood that when the motor speed is large, it can be corresponding to high frequency noise; when the motor speed is small, it can be corresponding to low frequency noise; when the motor speed changes little, that is, when it is basically constant, it can be corresponding to constant frequency noise; the motor speed is gradually increased. That is, when there is acceleration and the acceleration is greater than a certain value, it may be corresponding to the variable frequency noise.

Further, for the noise signal of any frequency band, the noise signal of the frequency band can be frequency-structured by sound processing software (such as MATLAB) according to the musical acoustic or psychoacoustic principle to generate a plurality of structured sound signals.

In an embodiment of the invention, the frequency band to which the frequency of each synthesized sound sample belongs includes the selected frequency band. For example, for the noise signal in the 4000-5000 Hz band, the frequency structure is used to obtain the low-frequency signal in the 400-500 Hz band, and the frequency of the synthesized sound sample obtained by the combination of the two can be 400-6000 Hz, visible, 400-6000 Hz band. Includes the 4000-5000Hz band. Thus, by constructing the sound signal, the frequency of the noise signal of the selected frequency band can be compensated, that is, the frequency coverage of the synthesized sound sample is wide.

Wherein, the sound pressure level of the constructed sound signal is less than or equal to the sound pressure level of the noise signal of the selected frequency band, and thus, after the sound signal is constructed and the noise signal of the selected frequency band is synthesized, the sound pressure level of the sound signal is constructed. The effect of the sound pressure level of the synthesized sound sample is small. It can be understood that when the sound pressure level of the sound signal is smaller than the sound pressure level of the noise signal of the selected frequency band, the difference between the sound pressure level of the sound signal and the sound pressure level of the noise signal of the selected frequency band is larger, and the sound is constructed. The effect of the sound pressure level of the signal on the sound pressure level of the resulting synthesized sound sample is smaller.

It should be noted that, in other specific implementation manners of the active noise reduction system of the new energy vehicle of the embodiment of the present invention, reference may be made to the specific implementation manner of the active noise reduction method of the new energy vehicle according to the above embodiment of the present invention, in order to reduce redundancy, Do not repeat it.

The active noise reduction system of the new energy vehicle of the embodiment of the present invention pre-establishes a functional relationship between the operating parameters of the new energy vehicle and the frequency of the environmental noise signal in the vehicle, and between the frequency of the ambient noise signal in the vehicle and the structural sound signal. The relationship is intuitive; the acquisition module uses the CAN bus to collect the operating parameters of the new energy vehicle, and the frequency of the interior environmental noise signal is obtained through the CAN bus through the first acquisition module, and is acquired by the second acquisition module through the CAN bus. The structural sound signal corresponding to the frequency improves the objective accuracy of the data, and further integrates the sound signal and the ambient noise signal to realize the noise reduction processing of the vehicle interior environment. The system is small and light, easy to implement, simple to operate, and convenient for users.

Further, the present invention proposes a new energy vehicle.

7 is a block diagram showing the structure of a new energy vehicle according to an embodiment of the present invention. As shown in FIG. 7, the new energy vehicle 1000 includes the active noise reduction system 100 of the new energy vehicle described above.

In addition, other configurations and functions of the new energy vehicle according to the embodiments of the present invention are known to those skilled in the art, and are not described herein in order to reduce redundancy.

In the description of the present invention, it is to be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements, unless otherwise specified Limited. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the present invention, the first feature "on" or "under" the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims

An active noise reduction method for a new energy vehicle, characterized in that it comprises the following steps:

Acquiring an operating parameter of the new energy vehicle, and acquiring a frequency of an in-vehicle environmental noise signal associated with the operating parameter according to the operating parameter, wherein the operating parameter includes at least a motor speed of the new energy vehicle;

Obtaining a structured sound signal corresponding to the in-vehicle ambient noise signal by calling a preset constructed sound database according to a frequency of the in-vehicle ambient noise signal;

The sound playing module disposed on the new energy vehicle outputs the constructed sound signal, and is fused with the interior environmental noise signal by the constructed sound signal to perform noise reduction processing on the interior environment.
The active noise reduction method for a new energy vehicle according to claim 1, characterized in that the data information transmitted by the CAN bus of the new energy vehicle is read to realize the collection of the operating parameters.
The active noise reduction method for a new energy vehicle according to claim 1 or 2, wherein the preset ambient sound database is acquired according to the frequency of the interior environmental noise signal to acquire an environmental noise signal with the vehicle interior Corresponding structural sound signals, including:

Determining a frequency band to which the ambient noise signal of the vehicle is located according to a frequency of the ambient noise signal in the vehicle;

And calling the preset structured sound database according to the frequency band of the in-vehicle environmental noise signal to acquire a structured sound signal corresponding to a frequency band to which the in-vehicle ambient noise signal belongs, wherein the preset structured sound A plurality of constructed sound samples are stored in the database, each constructed sound sample corresponding to a noise frequency band, and includes a structured sound signal corresponding to the noise frequency band.
The active noise reduction method for a new energy vehicle according to any one of claims 1 to 3, wherein the predetermined construction sound database construction process comprises:

Collecting operating parameters of the new energy vehicle and noise of the interior environment under different working conditions;

Performing spectrum analysis on noise of the in-vehicle environment to obtain noise spectrum feature information associated with the operating parameter, and establishing a relationship between the operating parameter and noise of the vehicle interior environment according to the noise spectrum feature information Correspondence relationship

And performing frequency band division on noise of the vehicle interior environment under different operating conditions according to the noise spectrum characteristic information to obtain noise signals of multiple frequency bands;

Selecting a noise signal of any frequency band, and frequency constructing the noise signal of the selected frequency band according to musical acoustic or psychoacoustic principles to generate a plurality of structured sound signals;

Generating a noise signal of the selected frequency band with each of the constructed sound signals to generate and output a plurality of synthesized sound samples, wherein a frequency band of each of the synthesized sound samples includes a frequency band of the selected noise signal;

Each synthesized sound sample is scored according to a preset evaluation method, and a constructed sound sample corresponding to the noise signal of the selected frequency band is acquired based on the score result of each synthesized sound sample.
The active noise reduction method for a new energy vehicle according to claim 4, wherein the noise generated by the motor is detected to collect noise of the interior environment of the vehicle.
The active noise reduction method for a new energy vehicle according to claim 4 or 5, characterized in that the sound pressure level of the constructed sound signal is less than or equal to the sound pressure level of the noise signal of the selected frequency band.
An active noise reduction system for a new energy vehicle, characterized in that it comprises:

An acquisition module, configured to collect an operating parameter of the new energy vehicle, wherein the operating parameter includes at least a motor speed of the new energy vehicle;

a first acquiring module, configured to acquire, according to the operating parameter, a frequency of an in-vehicle environmental noise signal associated with the operating parameter;

a second acquiring module, configured to acquire a structured sound signal corresponding to the in-vehicle environmental noise signal by calling a preset configuration sound database according to a frequency of the in-vehicle environmental noise signal;

a sound playing module disposed on the new energy vehicle;

And a control module, configured to control the sound playing module to output the constructed sound signal, and fuse the constructed sound signal with the in-vehicle ambient noise signal to perform noise reduction processing on the vehicle interior environment.
The active noise reduction system for a new energy vehicle according to claim 7, characterized in that the data information transmitted by the CAN bus of the new energy vehicle is read to realize the collection of the operating parameters.
The active noise reduction system of the new energy vehicle according to claim 7 or 8, wherein the second acquisition module comprises:

a determining unit, configured to determine, according to a frequency of the in-vehicle environmental noise signal, a frequency band to which the in-vehicle environmental noise signal belongs;

The calling module is configured to invoke the preset structured sound database according to the frequency band of the in-vehicle environmental noise signal to acquire a structured sound signal corresponding to a frequency band to which the in-vehicle ambient noise signal belongs, wherein the A plurality of constructed sound samples are stored in the preset structured sound database, each constructed sound sample corresponding to a noise frequency band, and includes a structured sound signal corresponding to the noise frequency band.
The active noise reduction system for a new energy vehicle according to any one of claims 7 to 9, wherein the construction process of the preset structured sound database comprises:

Collecting operating parameters of the new energy vehicle and noise of the interior environment under different working conditions;

Performing spectrum analysis on noise of the in-vehicle environment to obtain noise spectrum feature information associated with the operating parameter, and establishing a relationship between the operating parameter and noise of the vehicle interior environment according to the noise spectrum feature information Correspondence relationship

And performing frequency band division on noise of the vehicle interior environment under different operating conditions according to the noise spectrum characteristic information to obtain noise signals of multiple frequency bands;

Selecting a noise signal of any frequency band, and frequency constructing the noise signal of the selected frequency band according to musical acoustic or psychoacoustic principles to generate a plurality of structured sound signals;

Generating a noise signal of the selected frequency band with each of the constructed sound signals to generate and output a plurality of synthesized sound samples, wherein a frequency band of each of the synthesized sound samples includes a frequency band of the selected noise signal;

Each synthesized sound sample is scored according to a preset evaluation method, and a constructed sound sample corresponding to the noise signal of the selected frequency band is acquired based on the score result of each synthesized sound sample.
The active noise reduction system for a new energy vehicle according to claim 10, wherein the noise generated by the motor is detected to achieve noise collection of the interior environment of the vehicle.
The active noise reduction system for a new energy vehicle according to claim 10 or 11, wherein the sound pressure level of the constructed sound signal is less than or equal to the sound pressure level of the noise signal of the selected frequency band.
A new energy vehicle characterized by comprising an active noise reduction system for a new energy vehicle according to any of claims 7-12.