the control module 340 is respectively connected to the frequency compensation module 330, thejudgment module 320 and thespeaker 400, and is configured to receive a single-frequency compensation signal output by the frequency compensation module 330, and when thejudgment module 320 judges that the total sound pressure level outside the vehicle reaches a preset condition, adaptively switch the frequency composition and the sound pressure level of the pedestrian warning sound according to the single-frequency compensation signal to obtain a warning sound to be played, and control thespeaker 400 to play the warning sound to be played;

the control module 340 is further configured to control thespeaker 400 to play the pedestrian warning sound when the judgingmodule 320 judges that the total sound pressure level outside the vehicle does not reach the preset condition.

In other embodiments, as shown in fig. 2, the control module 340 may be a pedestrian warning controller independent from theprocessor 300, and theprocessor 300 is a central processor including a calculatingmodule 310, a judgingmodule 320 and a frequency compensating module 330. When the total sound pressure level outside the automobile is more than or equal to 52dB (A) and the duration exceeds 3s, the central processor outputs a single-frequency compensation signal of 1000Hz, the pedestrian warning controller adaptively switches the frequency composition and the sound pressure level of the pedestrian warning sound according to the single-frequency compensation signal to obtain warning sound to be played, and controls a pedestrian warning loudspeaker to play the warning sound to be played; when the total sound pressure level outside the automobile is less than 52dB (A) and the duration exceeds 3s, the central processing unit cancels the frequency compensation function, and the pedestrian warning controller directly controls the pedestrian warning loudspeaker to play the original pedestrian warning sound.

Alternatively, theprocessor 300 may be a processor already installed in the electric vehicle, and then a module including an off-vehicle total sound level calculating function and a frequency compensating function may be integrated with the processor, or may be a separately installed processor including the functions, so long as the respective functions of theprocessor 300 can be implemented, which is not limited herein.

It should be appreciated that in embodiments of the present application, the processor may be a central processing unit (Central Processing Unit, CPU), which may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, and is not limited in this regard.

It should be understood that, in the application scenario of each embodiment of the present application, the electric vehicle needs to play the low-speed alert sound to prompt a pedestrian, and when the electric vehicle does not need to play the low-speed alert sound, the embodiment of the present application may also control thespeaker 400 to stop playing according to the actual situation.

From the above, the embodiment of the application provides an electric automobile low-speed prompt tone self-adaptive control system, which can sense the sound pressure level of the external environment noise of the automobile in real time, and accordingly, the frequency spectrum and the sound pressure level of the low-speed prompt tone emitted by the automobile are self-adaptively adjusted, so that the low-speed prompt tone can be distinguished from the background noise and is easily sensed by pedestrians on the road, and the risk of traffic accidents is reduced. Meanwhile, the frequency composition and the sound pressure level of the low-speed prompt sound are adaptively adjusted, so that the influence on the overall sound pressure level change of the sound is small, namely, the total sound pressure level is small, the noise outside the automobile can be ensured to meet the regulation requirement, and the influence on the driver in the automobile can be avoided, so that the NVH problem is caused. In addition, the low-speed prompt tone self-adaptive control system for the electric automobile provided by the embodiment of the application has low power requirements on a loudspeaker, and saves cost. The self-adaptive adjusting device is suitable for self-adaptive adjustment of pedestrian warning sounds when the electric automobile runs at a low speed.

Example two

The embodiment of the application provides a control method based on an electric automobile low-speed prompt tone adaptive control system, which is applied to adaptive control of electric automobile low-speed prompt tones, as shown in fig. 5, and comprises the following steps:

step 210: collecting an out-of-vehicle noise signal in real time;

step 220: calculating the total sound pressure level outside the vehicle according to the noise signal outside the vehicle;

step 230: judging whether the total sound pressure level outside the automobile reaches a preset condition, if so, executingstep 240 to adaptively switch the frequency composition and the sound pressure level of pedestrian warning sounds to obtain warning sounds to be played, and controlling the electric automobile to play the warning sounds to be played, wherein the pedestrian warning sounds are preset sounds in the electric automobile; otherwise,step 250 is executed to control the electric automobile to play the pedestrian warning sound.

Optionally, instep 210, the external noise signals of the corresponding number around the electric vehicle are obtained according to the specific number of the noise collecting devices set in the low-speed alert sound adaptive control system of the electric vehicle.

Optionally, instep 220, the obtained noise signals outside the vehicle are processed in real time, and an average total sound pressure level of the noise signals outside the vehicle is calculated as the total sound pressure level outside the vehicle, so that in a subsequent step, pedestrian warning sounds are adaptively adjusted according to the change of the total sound pressure level outside the vehicle.

Optionally, instep 230, a preset condition for determining the total sound pressure level outside the vehicle may be preset, where the preset condition is that the total sound pressure level outside the vehicle is greater than or equal to 52dB (a) and the duration exceeds 3 seconds, or preset conditions of other sound pressure level ranges and duration ranges may also be set according to the reference standard GBT37153-2018 electric automobile low-speed alert tone.

Optionally, instep 230, adaptively switching the frequency component and the sound pressure level of the pedestrian warning sound to obtain the warning sound to be played includes:

and carrying out frequency compensation of 1000Hz on the pedestrian warning sound, and simultaneously carrying out sound pressure level presetting on the pedestrian warning sound subjected to frequency compensation to obtain the warning sound to be played. In other embodiments, the pedestrian warning sound may be compensated in other frequencies according to actual situations, which is not limited herein.

In one implementation mode, when the total sound pressure level outside the automobile is more than or equal to 52dB (A) and the duration exceeds 3s, the electric automobile low-speed prompt sound self-adaptive control system outputs a 1000Hz single-frequency compensation signal through a central processing unit, increases single-frequency sound with the frequency of 1000Hz in pedestrian warning sound, plays the single-frequency sound through a pedestrian warning loudspeaker at a certain sound pressure level, and increases the perceptibility of pedestrians on pedestrian prompt sound; when the total sound pressure level outside the automobile is less than 52dB (A) and the duration exceeds 3s, the central processing unit cancels the frequency compensation function, and the pedestrian warning loudspeaker plays the original pedestrian warning sound.

From the above, according to the low-speed prompt tone self-adaptive control method for the electric automobile, provided by the embodiment of the application, the sound pressure level of the external environment noise of the automobile can be perceived in real time, and the frequency spectrum and the sound pressure level of the low-speed prompt tone emitted by the automobile are subjected to self-adaptive adjustment according to the sound pressure level, so that the low-speed prompt tone can be distinguished from the background noise and is easily perceived by pedestrians on the road, and the risk of traffic accidents is reduced. Meanwhile, the frequency composition and the sound pressure level of the low-speed prompt sound are adaptively adjusted, so that the influence on the overall sound pressure level change of the sound is small, the noise outside the automobile can be ensured to meet the regulation requirement, and the influence on the driver in the automobile can be avoided, so that the NVH problem is caused. In addition, the low-speed prompt tone self-adaptive control method for the electric automobile provided by the embodiment of the application has low power requirements on the loudspeaker, and saves cost. The self-adaptive adjusting device is suitable for self-adaptive adjustment of pedestrian warning sounds when the electric automobile runs at a low speed.

It should be appreciated that the above-described integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer-readable storage medium. Based on such understanding, the present application may implement all or part of the flow of the method of the above embodiment, or may be implemented by instructing related hardware by a computer program, where the computer program may be stored in a computer readable storage medium, and the computer program may implement the steps of each method embodiment described above when executed by a processor. The computer program comprises computer program code, and the computer program code can be in a source code form, an object code form, an executable file or some intermediate form and the like. The computer readable medium may include: any entity or device capable of carrying the computer program code described above, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. The content of the computer readable storage medium can be appropriately increased or decreased according to the requirements of the legislation and the patent practice in the jurisdiction.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.

It should be noted that, the method and the details thereof provided in the foregoing embodiments may be combined into the apparatus and the device provided in the embodiments, and are referred to each other and are not described in detail.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other manners. For example, the apparatus/device embodiments described above are merely illustrative, e.g., the division of modules or elements described above is merely a logical functional division, and may be implemented in other ways, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims

1. The utility model provides an electric automobile low-speed suggestion sound self-adaptation control system, is applied to electric automobile, electric automobile includes automobile body and speaker, its characterized in that, electric automobile low-speed suggestion sound self-adaptation control system includes:

2. The electric vehicle low-speed alert tone adaptive control system according to claim 1, wherein the noise collection device comprises: at least one directional microphone.

3. The electric car low-speed alert sound adaptive control system according to claim 2, wherein when the noise collection device includes 4 directional microphones, the 4 directional microphones are respectively disposed at four corners of the top outside the car body, and the directional direction of each directional microphone is 45 degrees from the abscissa and ordinate directions of the car body.

4. The electric vehicle low-speed alert tone adaptive control system according to claim 2 or 3, wherein the processor comprises: a computing module;

5. The electric vehicle low-speed alert tone adaptive control system according to claim 4, wherein the processor further comprises: a judging module;

6. The electric vehicle low-speed alert tone adaptive control system according to claim 5, wherein the processor further comprises: a frequency compensation module;

7. The electric vehicle low-speed alert tone adaptive control system according to claim 6, wherein the processor further comprises: a control module;

8. The control method based on the low-speed prompt tone self-adaptive control system of the electric automobile is characterized by comprising the following steps of:

collecting an out-of-vehicle noise signal in real time;

9. The control method of claim 8, wherein adaptively switching the frequency composition and the sound pressure level of the pedestrian warning sound to obtain the warning sound to be played comprises:

10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any of claims 8-9.