CN111572311A - Active noise reduction system for electric automobile and electric automobile - Google Patents
Active noise reduction system for electric automobile and electric automobile Download PDFInfo
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- CN111572311A CN111572311A CN202010399370.2A CN202010399370A CN111572311A CN 111572311 A CN111572311 A CN 111572311A CN 202010399370 A CN202010399370 A CN 202010399370A CN 111572311 A CN111572311 A CN 111572311A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/037—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for occupant comfort, e.g. for automatic adjustment of appliances according to personal settings, e.g. seats, mirrors, steering wheel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
- B60H2001/006—Noise reduction
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Abstract
The invention belongs to the technical field of new energy electric automobiles, and particularly provides an active noise reduction system for an electric automobile and the electric automobile. The invention aims to solve the noise reduction problem of the air conditioner fan of the electric automobile. The active noise reduction system comprises a main noise acquisition device, a human ear positioning acquisition device and a signal processor, the main noise acquisition device is arranged in the air-conditioning box of the electric automobile, the human ear positioning acquisition device is arranged on the inner side of the electric automobile, the main noise acquisition device and the human ear positioning acquisition device are in communication connection with the signal processor, the signal processor receives noise signals and binaural position signals and updates output phase sound wave signals in real time, and the vehicle-mounted audio-video loudspeaker of the electric automobile receives the phase sound wave signals and outputs noise reversed-phase sound waves, so that noise reduction of fan noise of the air-conditioning box is realized.
Description
Technical Field
The invention belongs to the technical field of new energy electric automobiles, and particularly provides an active noise reduction system for an electric automobile and the electric automobile.
Background
The new energy electric automobile is a novel energy vehicle which adopts a vehicle-mounted power supply as power and uses a motor to drive wheels to run and meets various requirements of road traffic and safety regulations. With the change of living environment, electric automobiles gradually become the first choice for people to travel instead of walk. However, in the electric automobile, the noise of the air conditioning fan is a main noise source when the vehicle is running at a low speed or is stationary. When the air conditioning system is under the refrigeration or heating working condition, the air conditioning fan must participate in the work to realize the operation, and the exposure risk of the noise of the air conditioning fan in the vehicle is increased. The noise of the air conditioner fan in the car mainly comprises the running noise of the air conditioner fan and the airflow noise of an air conditioning box/air duct, the frequency of the noise is mainly characterized by wide-band mixed narrow-band peak values, the frequency is distributed in the range from hundreds of hertz to thousands of hertz, and the size of the noise is extremely related to the rotating speed and the air volume of the air conditioner fan.
In order to solve the problem of noise of an air conditioner fan in an automobile, currently adopted passive control measures mainly comprise air conditioner box/air duct flow field optimization, adoption of an acoustic material air duct and the like, but the passive control measures have a limited effect on improving the overall noise level.
Based on the current situation, how to more effectively reduce the noise of the air conditioner fan of the electric automobile becomes a problem to be solved in the field. In view of the above, the present invention is particularly proposed.
Disclosure of Invention
In order to solve the problems in the prior art, namely the problem of noise reduction of an air conditioner fan of an electric automobile, the invention provides an active noise reduction system for the electric automobile, wherein the electric automobile comprises an air conditioner box and an on-vehicle audio-visual loudspeaker.
The main noise acquisition device is used for acquiring noise signals generated by the air conditioning box in real time and transmitting the noise signals to the signal processor in a communication mode, the human ear positioning acquisition device is used for acquiring binaural position signals of a user in a vehicle in real time and transmitting the binaural position signals to the signal processor in a communication mode, the signal processor is used for receiving the noise signals and the binaural position signals and updating output phase sound wave output signals in real time, and the vehicle-mounted audio-video loudspeaker is used for receiving the phase sound wave output signals updated and output by the signal processor and emitting noise reversed-phase sound waves, so that the suppression of noise transmitted to the ears of the user is achieved.
In the above preferred technical scheme of the active noise reduction system for an electric vehicle, the active noise reduction system further comprises a frequency band compensation speaker, the frequency band compensation speaker is arranged inside a compartment of the electric vehicle and is in communication connection with the signal processor, and is used for simultaneously compensating an audio frequency band which cannot be emitted by the vehicle-mounted audio-video speaker.
In the above preferred technical solution of the active noise reduction system for an electric vehicle, the vehicle-mounted audio/video speaker is a medium-low frequency speaker, and correspondingly the frequency band compensation speaker is a medium-high frequency speaker; and/or the vehicle-mounted audio and video lower loudspeaker is arranged on the inner side of the vehicle door; and/or the band compensating speaker is provided to a headrest or a ceiling.
In the above preferred technical solution of the active noise reduction system for an electric vehicle, the active noise reduction system further includes an error noise collection device, and the error noise collection device is disposed in the vehicle near the positions of both ears of the user and is in communication connection with the signal processor.
In the above preferred technical scheme of the active noise reduction system for an electric vehicle, the air conditioning box includes an air conditioning fan and a plurality of different air conditioning air outlet channels, and the main noise collecting device is disposed at a portion, close to the air conditioning fan, in the air conditioning air outlet channel and embedded in an inner wall of the air conditioning air outlet channel.
In the above preferred technical solution of the active noise reduction system for an electric vehicle, the electric vehicle further includes a vehicle CAN (controller area network), and transmits a real-time status signal of the electric vehicle to the signal processor.
In the above preferred technical solution of the active noise reduction system for an electric vehicle, the electric vehicle further includes a sound and video processor and an audio mixer, the signal processor and the sound and video processor respectively with the audio mixer is connected in communication, the audio mixer with on-vehicle audio and video speaker is connected in communication, the audio mixer is used for the phase sound wave output signal with the audio signal output by the sound and video processor is mixed and processed.
In the above-mentioned preferred technical solution of the active noise reduction system for an electric vehicle, the signal processor is the video processor.
In the above preferred technical solution of the active noise reduction system for an electric vehicle, the active noise reduction system further includes a power amplifier, the signal processor is in communication connection with the power amplifier, the power amplifier is in communication connection with the vehicle audio-visual speaker, and/or the active noise reduction system further includes a power amplifier, and the power amplifier is integrated on the signal processor or the vehicle audio-visual speaker.
The invention further provides an electric automobile, which is the electric automobile in any one of the technical schemes and comprises the active noise reduction system in any one of the technical schemes.
The electric automobile comprises an air conditioning box, the air conditioning box comprises an air conditioning fan and a plurality of different air conditioning air outlet channels, the air conditioning fan blows air subjected to heat exchange to the interior of the automobile through the different air conditioning air outlet channels, the electric automobile further comprises a vehicle-mounted audio-visual loudspeaker, the active noise reduction system comprises a main noise collection device, a signal processor and a human ear positioning collection device, the main noise collection device is arranged in the air conditioning box, the human ear positioning collection device is arranged on the inner side of the automobile box of the electric automobile, and the main noise collection device, the human ear positioning collection device and the vehicle-mounted audio-visual loudspeaker are respectively in communication connection with the signal processor.
The main noise acquisition device acquires noise signals generated by an air conditioning box of the electric automobile in real time, transmits the noise signals to the signal processor in a communication mode, the human ear positioning acquisition device is internally provided with a human ear position information acquisition device which is used for acquiring binaural position signals of a user in the automobile in real time, transmits the binaural position signals to the signal processor in a communication mode, the signal processor updates output noise phase sound wave output signals in real time through the received noise signals and the binaural position signals, and the vehicle-mounted audio-video loudspeaker receives the noise phase sound wave output signals and outputs noise reversed-phase sound waves, so that the suppression of noise transmitted to the two ears of the user in the automobile is realized. Therefore, the active noise reduction of the fan noise of the air conditioner of the new energy electric automobile can be realized, and the whole noise level of the frequency within the range of 100 to 1000 Hz is reduced by 4dBA, so that the noise reduction of the fan noise of the air conditioner of the electric automobile is realized more effectively.
Drawings
The active noise reduction system for an electric vehicle and the electric vehicle of the present invention are described below with reference to the accompanying drawings. In the drawings:
FIG. 1 is a basic schematic diagram of an active noise reduction system of the present invention;
fig. 2 is an enlarged view of a point a in fig. 1.
List of reference numerals:
11-a primary noise collection device; 111-reference microphone; 112-card holder; 12-a human ear position acquisition device; 121-an in-vehicle camera; 13-a signal processor; 14-band compensation speaker; 15-error noise collection device; 151-error microphone; 16-a power amplifier; 21-an air-conditioning box; 211-air conditioning fan; 212-air conditioner air outlet channel; 22-vehicle audio and video loudspeaker; 23-vehicle CAN system; 24-a video processor; 25-mixer.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications. For example, although the human ear location acquiring device in the description is described as an in-vehicle camera, it is obvious that the human ear location acquiring device in the invention may employ a sonar sensor, a heat sensor, or other devices capable of recognizing the binaural position information of the in-vehicle user.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1 and fig. 2, in order to solve the noise reduction problem of the air conditioning box of the electric vehicle proposed in the background art, the active noise reduction system for the electric vehicle provided by the present invention includes a main noise collection device 11, an ear positioning collection device 12 and a signal processor 13, wherein the main noise collection device 11 and the ear positioning collection device 12 are respectively connected to the signal processor 13 in a communication manner, and the active noise reduction system further includes a frequency band compensation speaker 14, an error noise collection device 15 and a power amplifier 16, which are connected to the communication processor 13 in a communication manner; the electric vehicle comprises an air-conditioning box 21 and a vehicle-mounted audio and video loudspeaker 22. The specific working process of the invention is as follows: the main noise collecting device 11 is used for collecting the noise signal generated by the air conditioning box 21 in real time and transmitting the noise signal to the signal processor 13 in a communication way, the error noise collecting device 15 is used for collecting the actual noise at the position of the ear part of a human body and transmitting the actual noise to the signal processor 13, for correcting errors of theoretical noise and actual noise in real time, the ear positioning and collecting device 12 is used for collecting binaural position signals of a user in the vehicle in real time and transmitting the binaural position signals to the signal processor 13 in a communication manner, the signal processor 13 is used for receiving a main noise signal, an error noise signal and the binaural position signals, and updating the output noise phase sound wave output signal in real time, and transmitting the output noise phase sound wave output signal to the vehicle-mounted audio-video loudspeaker 22 and the frequency band compensation loudspeaker 14 through the power amplifier 16, wherein the vehicle-mounted audio-video loudspeaker 22 and the frequency band compensation loudspeaker 14 receive the signal and send out noise reverse sound waves, so that the suppression of noise transmitted into the ears of the user is realized.
With continuing reference to fig. 1 and fig. 2, the air conditioning box 21 includes an air conditioning fan 211 and an air conditioning air outlet channel 212, the air conditioning fan 211 blows heat-exchanged air into the electric vehicle through a plurality of different air conditioning air outlet channels 212 to achieve a heat exchange effect in the electric vehicle, the main noise collecting device 11 is disposed inside the air conditioning box 21 of the electric vehicle, and the main noise collecting device 11 is mainly used for collecting and picking up noise signals of the air conditioning box 21 or the air conditioning air outlet channel 212 in different operating modes in real time. For different working modes of the air conditioning box 21, the position of the reference microphone 111 in the air outlet channel 212 of the air conditioner is very important, and the specific position is selected depending on the structure of the air conditioning box 21 and the calibration result of the whole vehicle system. When the air-conditioning box 21 is in different operating modes, the operating states of the air-conditioning outlet channel 212 are also different, so in order to better collect the noise generated by the air-conditioning box 21 in different operating states, the mounting position of the reference microphone 111 should be on the inner wall of the air-conditioning outlet channel 212 corresponding to the air-conditioning box 21 in each operating mode, preferably close to the air-conditioning blower 211 body, and the reference microphone 111 is embedded in the inner wall of the air-conditioning outlet channel 212 by the clip 112. Embedding the reference microphone 111 into the inner wall of the air-conditioning air outlet channel can ensure that the inner wall of the air-conditioning air outlet channel 212 has no structural protrusion after the reference microphone 111 is installed, so that the airflow flow of the air-conditioning air outlet channel 212 is not affected; another advantage of embedding the reference microphone 111 in the inner wall of the air-conditioning outlet channel 212 is that direct damage to the reference microphone 111 caused by the airflow in the air-conditioning outlet channel 212 is avoided, and the service life of the reference microphone 111 can be prolonged, thereby reducing the number of times of replacing the reference microphone 111. In the actual noise reduction process, in combination with the actual situation of the air conditioning cabinet 21, in order to better collect the noise generated by the air conditioning fan 211, the number of the reference microphones 111 needs 6-8, and small-sized microphones are selected as the preferable scheme of the reference microphones 111, and the small-sized microphones can be well embedded into the inner wall of the air conditioning air outlet channel 212, so that the inner wall of the air conditioning air outlet channel 212 is prevented from generating structural protrusions.
With reference to fig. 1, in an implementation, the main noise collecting device 11 is preferably fixedly connected to the air conditioning box 21, but may be connected to the air conditioning box 21 in other ways such as sliding connection.
Continuing to refer to fig. 1, the human ear positioning and collecting device 12 is disposed inside a compartment of the electric vehicle and is configured to collect the positions of both ears of the user in the vehicle in real time. Human ear location collection system 12 can utilize in-vehicle camera 121 real-time analysis discernment in-vehicle user's ears position signal, and with ears position signal communication transmission to signal processor 13, signal processor 13 can catch in-vehicle user's ears position signal according to in-vehicle camera 121, real-time update phase sound wave output signal is from frequency channel compensation speaker 14 to the transfer function of ears, and suitably adjust the noise anti-phase sound wave output of frequency channel compensation speaker 14 and on-vehicle audio-visual speaker 22, can balance in-vehicle left and right ear's acoustic pressure, reduce near ears noise, and then make in-vehicle user ears obtain better real-time noise reduction effect. Preferably, in this embodiment, the in-vehicle camera 121 is used to identify the binaural position of the in-vehicle user in real time, and in addition, other sensors capable of capturing binaural position information, such as a sonar sensor and a heat sensor, may also be used, in order to achieve a better noise reduction effect, the human ear positioning and collecting device 12 should be used in match with the frequency band compensation speaker 14, and for the high-frequency noise component in the original noise generated by the air conditioner fan 211, the human ear positioning and collecting device 12 can achieve that when the head or both ears of the in-vehicle user move within a certain range, the noise reduction effect can also be ensured. In addition, the noise sum can be determined according to the noise of different positions of the two ears by acquiring the positions of the two ears, so that the accurate positions of the two ears are acquired, compared with the method for directly acquiring the position of the user or the position of the head, the calculation parameters of the method are more sufficient, the calculation is more accurate, and the noise reduction of the method is more targeted and the effect is better. At present, the collection of human bodies in the vehicle is completely concentrated on head collection or the collection of the whole positions of the human bodies is finished, a more precise instrument is mostly selected in the lifting direction in the aspect of lifting precision, and a scheme about more refined binaural positions for precise collection is not recorded, namely two different lifting directions are obtained by refining the positions and selecting a machine more refined by collecting the binaural positions.
Continuing to refer to fig. 1, the car audio/video speaker 22 is disposed inside the door of the electric vehicle and is in communication with the signal processor 13. The skilled person can understand that, the ordinary vehicle audio-visual speaker 22 is a middle-low frequency speaker, in the present application, the frequency range of the middle-low frequency is defined in 100Hz to 500Hz, and the audio signal not in the frequency range cannot be output through the vehicle audio-visual speaker 22, in order to make the frequency range wider and make the active noise reduction effect better, in the present embodiment, the middle-high frequency speaker is added as the frequency range compensation speaker 14 to compensate the audio frequency range that the vehicle audio-visual speaker 22 cannot emit, in the present application, the frequency range of the middle-high frequency is defined above 400Hz, and the frequency range compensation speaker 14 is disposed inside the electric vehicle and is in communication connection with the signal processor 13. The vehicle-mounted audio-visual speaker 22 can emit anti-phase sound waves for suppressing low-medium frequency noise, the sound field near the ears of the user in the vehicle can cancel the low-medium frequency components in the original noise generated by the air conditioning box 21, and the frequency band compensation speaker 14 can emit anti-phase sound waves for suppressing medium-high frequency noise to cancel the medium-high frequency components in the original noise near the ears of the user in the vehicle, so that the noise reduction effect of the original noise generated by the air conditioning box 21 is achieved. Preferably, the frequency band compensation speaker 14 may be integrated in the headrest of the electric vehicle seat, or a medium-high frequency speaker disposed in the ceiling may be used instead.
Continuing to refer to fig. 1, the error noise collecting device 15 is disposed at a position near the head or both ears of the user in the vehicle, and is mainly used for collecting actual noise signals near the sound field of both ears of the user in the vehicle, and feeding back the actual noise signals collected in real time to the signal processor 13, thereby completing error noise compensation at the position of both ears of the user in the vehicle. Preferably, in this embodiment, the error noise collecting device 15 adopts the error microphone 151 to collect the binaural position error noise, and may also adopt other devices capable of collecting sound information, such as a recording pen, and the error microphone 151 may be integrated in the headrest of the electric vehicle seat, or may be disposed in the ceiling of the head of the user in the vehicle, and in order to achieve a better noise reduction effect, the error microphone 151 needs 1 to 2/seat.
With continued reference to fig. 1, CAN is an abbreviation of Controller Area Network (hereinafter referred to as CAN), is a standard bus of an automobile computer control system and an embedded industrial control local Area Network, is one of field buses with the widest application range internationally, is a serial data communication protocol developed for solving data exchange between numerous control and test instruments in modern automobiles, is a serial communication Network which takes coaxial cables, twisted pairs or optical fibers as a communication medium and CAN effectively support distributed control or real-time control, and has outstanding reliability, real-time performance and flexibility in data communication of the CAN bus. According to the invention, the whole vehicle CAN system 23 transmits the real-time state signal of the electric vehicle to the signal processor 13 and is in communication connection with the signal processor 13. The whole vehicle CAN system 23 judges whether noise reduction processing is required to be continuously performed in the vehicle by extracting a real-time state signal of the electric vehicle. As an example, the real-time status signal of the electric vehicle in the entire vehicle CAN system 23 includes an operation mode signal of the air conditioning box 21, wherein the operation mode of the air conditioning box 21 mainly includes an internal/external circulation mode, a defrosting and defogging mode, a face blowing mode, a foot blowing mode, a composite mode, and the like. Similarly, the real-time status signal may also be a duty ratio signal of the air conditioner fan 211, an in-vehicle temperature setting signal, a vehicle speed signal, and the like. For example, when the vehicle speed is above 40km/h, the noise generated by the low-gear air conditioning fan 211 is already covered by the tire noise and the road noise at this time, the entire vehicle CAN system 23 transmits the current vehicle speed signal to the signal processor, and the active noise reduction function of the electric vehicle CAN be turned off at this time. For another example, when the window is opened, no matter whether the vehicle speed is over 40km/h, the noise generated by the air conditioner fan 211 is covered by the road noise, and the entire vehicle CAN system 23 transmits the window opening signal to the signal processor, so that it CAN be determined that the active noise reduction function of the electric vehicle CAN be turned off at this time. The signal in the entire vehicle CAN system 23 is a signal input to the signal processor 13, but the electric vehicle signal transmitted to the signal processor 13 by communication is not limited to the signal in the actual process of reducing noise of the air-conditioning box 21.
Continuing to refer to fig. 1, the signal processor 13 and the video processor 24 are respectively connected to the audio mixer 25 in communication, the audio mixer 25 is connected to the vehicle audio/video speaker 22 in communication, the audio signal output by the video processor 24 is subjected to audio mixing processing through the sound wave antiphase output signal generated by the audio mixer 25 and the signal processor 13, and the audio signal and the noise antiphase sound wave signal after audio mixing are output to the vehicle audio/video speaker 22 and the band compensation speaker 14 through the power amplifier 16 connected to the signal processor 13 in communication on the premise of not affecting the audio signal, so that the noise antiphase sound wave mixed in the audio signal is received by two ears of a user in the vehicle, thereby achieving the effect of noise reduction. Preferably, the signal processor 13 and the audio/video processor 24 may be the same processor, the power amplifier 16 is communicatively coupled to the vehicle audio/video speaker 22, and/or the power amplifier 16 may be a separate device as shown in fig. 1, or may be integrated with the signal processor 13 or the vehicle audio/video speaker 22.
With reference to fig. 1, in a possible implementation manner, the signal processor 13 is a dual-core signal processor, and the setting manner can meet the processing requirement of large-scale data in the active noise reduction process of the air conditioner fan of the electric vehicle, so as to avoid the situation that the signal processor 13 fails due to a large amount of data signals in the active noise reduction process, thereby ensuring the high efficiency in the calculation and analysis processes of the signal processor 13.
In the above embodiments, active noise reduction is mainly performed for a single user in an electric vehicle. In another aspect, the present invention further provides an active noise reduction system for multiple users in an electric vehicle, including the active noise reduction system according to any one of the above aspects. Preferably, in order to meet the active noise reduction requirements of multiple users in a vehicle, the active noise reduction system must meet the requirement that a frequency band compensation speaker 14 and an error noise collection device 15 are integrated in each seat headrest in the vehicle, or the frequency band compensation speaker 14 and the error noise collection device 15 are arranged on the ceiling of the heads of all the users in the vehicle, and then the existing vehicle audio-video speaker 22 of the electric vehicle is used for outputting the anti-phase sound wave of the original noise generated by the air-conditioning box 21, so as to meet the noise reduction requirements of the multiple users in the vehicle.
In particular, in order to achieve the expected active noise reduction effect, the active noise reduction system of the air conditioner fan 211 should be calibrated and debugged according to the actual operation condition of the air conditioner box 21.
In conclusion, the active noise reduction system for the electric vehicle mainly solves the problem of effective noise reduction of the noise of the air conditioner fan of the electric vehicle, and comprises a main noise collection device 11, wherein the main noise collection device 11 comprises a reference microphone 111 embedded in an air conditioner air outlet channel 212 of an air conditioner box 21 in a corresponding working mode and a clamp 112 for fixing the reference microphone 111, the main noise collection device 11 is in communication connection with a signal processor 13, and as a preferred scheme, the number of the reference microphones 111 is 6-8; the human ear positioning and collecting device 12 comprises an in-vehicle camera 121 for analyzing and identifying the position information of two ears, and transmits the position signals of the two ears to the signal processor 13; the frequency band compensation loudspeaker 14 is integrated in the seat headrest or is replaced by a medium-high frequency loudspeaker installed on a ceiling, and the frequency band compensation loudspeaker 14 is used for compensating frequency band signals which cannot be sent by the vehicle audio-video loudspeaker 22; the error noise acquisition device 15 comprises error microphones 151, the error microphones 151 are integrated on the seat headrest close to the positions of the ears of the user or are arranged on the ceiling, and are in communication connection with the signal processor 13, and as a preferable scheme, the number of the error microphones 151 is 1-2 per seat; the system comprises a whole vehicle CAN system 23 and a power amplifier 16 which are in communication connection with a signal processor 13, wherein the power amplifier 16 is integrated on a vehicle audio and video loudspeaker 22 or the signal processor 13, and a video processor 24 which is in communication connection with a sound mixer 25, wherein as a preferred scheme, the video processor 24 and the signal processor 13 are the same processor; as can be understood by those skilled in the art, the working principle of the invention is as follows: the air conditioner 21 is in different working modes, the air conditioner fan 211 can generate noise, the main noise collecting device 11 collects noise signals generated by the air conditioner fan 211 in different working modes by the aid of the reference microphone 111 and transmits the noise signals to the signal processor 13 in a communication mode, meanwhile, the human ear positioning collecting device 12 captures binaural position signals of a user in a vehicle in real time by the aid of the vehicle camera 121 and transmits the binaural position signals to the signal processor 13, the signal processor 13 receives the noise signals and the binaural position signals and updates output phase sound wave output signals in real time, the vehicle audio-visual loudspeaker 22 receives the phase sound wave output signals and sends noise anti-phase sound waves processed by the audio mixer 25 and the power amplifier 16, noise transmitted to human ears is suppressed, and accordingly the noise reduction effect is achieved.
It should be noted that the above-mentioned embodiments are only used for illustrating the principle of the present invention, and are not intended to limit the protection scope of the present invention, and those skilled in the art can modify the above-mentioned structure so that the present invention can be applied to more specific application scenarios without departing from the principle of the present invention.
For example, in an alternative embodiment, the ear position collecting device 12 may be a camera and a heat sensor in the vehicle, so long as the effect of collecting the position information of the ears of the user in the vehicle can be achieved, which does not depart from the principle of the present invention and thus falls within the protection scope of the present invention.
For example, in another alternative embodiment, the main noise collection device 11 and the error noise collection device 15 may be a recording pen, a microphone, etc., as long as the effect of collecting noise near the air conditioner outlet channel 212 and the ears of the user in the vehicle can be achieved, which do not depart from the principle of the present invention and thus fall within the protection scope of the present invention.
For example, in another alternative embodiment, the clip 112 of the main noise collecting device 11 for fixing the reference microphone 111 may be a microphone clip and a card slot/snap connection, etc., as long as the effect of fixing the reference microphone 111 on the inner wall of the air conditioner outlet channel 212 can be achieved, which do not depart from the principle of the present invention, and therefore, all of them will fall into the protection scope of the present invention.
For example, in another alternative embodiment, it is obviously feasible to have only one vehicle audio/video speaker in the vehicle without providing the frequency band compensation speaker, and only correspondingly select the vehicle audio/video speaker with the largest frequency band range as possible, without departing from the principle of the present invention, and therefore, all of them will fall within the protection scope of the present invention.
In addition, the invention also provides an electric automobile which is the electric automobile in any one of the above embodiments and is provided with the active noise reduction system in any one of the above embodiments.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. An active noise reduction system for an electric automobile, wherein the electric automobile comprises an air-conditioning box and further comprises a vehicle-mounted audio-visual loudspeaker, and is characterized in that the active noise reduction system comprises a main noise acquisition device, a signal processor and a human ear positioning acquisition device, the main noise acquisition device is arranged in the air-conditioning box, the human ear positioning acquisition device is arranged on the inner side of a carriage of the electric automobile,
the main noise acquisition device is used for acquiring noise signals generated by the air conditioning box in real time and transmitting the noise signals to the signal processor in a communication mode, the human ear positioning acquisition device is used for acquiring binaural position signals of a user in a vehicle in real time and transmitting the binaural position signals to the signal processor in a communication mode, the signal processor is used for receiving the noise signals and the binaural position signals and updating output phase sound wave output signals in real time, and the vehicle-mounted audio-video loudspeaker is used for receiving the phase sound wave output signals from the signal processor after updating and outputting and sending noise reverse sound waves, so that the suppression of noise entering the ear of the user is achieved.
2. The active noise reduction system for electric vehicles according to claim 1, further comprising a frequency band compensation speaker, wherein the frequency band compensation speaker is disposed inside the vehicle cabin and is in communication with the signal processor, for simultaneously compensating for an audio frequency band that cannot be emitted by the vehicle audio/video speaker.
3. The active noise reduction system for electric vehicles according to claim 2, wherein the vehicle audio/video speaker is a mid-low frequency speaker, and correspondingly the band compensation speaker is a mid-high frequency speaker; and/or the like and/or,
the vehicle-mounted audio and video loudspeaker is arranged on the inner side of the vehicle door; and/or the like and/or,
the frequency band compensation loudspeaker is arranged on a headrest or a ceiling.
4. The active noise reduction system for electric vehicles according to claim 1, further comprising an error noise collection device disposed in the vehicle near the ears of the user and communicatively connected to the signal processor.
5. The active noise reduction system for the electric vehicle according to claim 1, wherein the air conditioning box comprises an air conditioning fan and a plurality of different air conditioning outlet channels, and the main noise collecting device is disposed in a portion of the air conditioning outlet channel close to the air conditioning fan and embedded in an inner wall of the air conditioning outlet channel.
6. The active noise reduction system for electric vehicles according to claim 1, wherein the electric vehicle further comprises a full vehicle CAN (controller area network) and transmits a real-time status signal of the electric vehicle to the signal processor.
7. The active noise reduction system for electric vehicles of claim 1, wherein the electric vehicle further comprises a video processor and an audio mixer, the signal processor and the video processor are respectively connected to the audio mixer in communication, the audio mixer is connected to the vehicle audio/video speaker in communication, and the audio mixer is used for mixing the phase sound wave output signal and the audio signal output by the video processor.
8. The active noise reduction system for electric vehicles of claim 7, wherein the signal processor is the video processor.
9. The active noise reduction system for electric vehicles of claim 1, further comprising a power amplifier, wherein the signal processor is communicatively coupled to the power amplifier, and wherein the power amplifier is communicatively coupled to the vehicle audio and video speaker; and/or the like and/or,
the active noise reduction system further comprises a power amplifier, and the power amplifier is integrated on the signal processor or the vehicle-mounted audio-video loudspeaker.
10. An electric vehicle, characterized in that the electric vehicle is the electric vehicle of any one of claims 1 to 9, and the electric vehicle comprises the active noise reduction system for electric vehicles of any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010399370.2A CN111572311A (en) | 2020-05-12 | 2020-05-12 | Active noise reduction system for electric automobile and electric automobile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010399370.2A CN111572311A (en) | 2020-05-12 | 2020-05-12 | Active noise reduction system for electric automobile and electric automobile |
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| CN111572311A true CN111572311A (en) | 2020-08-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112771606A (en) * | 2020-12-31 | 2021-05-07 | 华为技术有限公司 | Automobile air conditioner noise control system and method and related vehicle-mounted equipment |
| CN113548134A (en) * | 2021-06-28 | 2021-10-26 | 神龙汽车有限公司 | System and method for calculating ventilation noise of air conditioner |
-
2020
- 2020-05-12 CN CN202010399370.2A patent/CN111572311A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112771606A (en) * | 2020-12-31 | 2021-05-07 | 华为技术有限公司 | Automobile air conditioner noise control system and method and related vehicle-mounted equipment |
| WO2022141562A1 (en) * | 2020-12-31 | 2022-07-07 | 华为技术有限公司 | Vehicle air conditioner noise control system and method, and related vehicle-mounted device |
| CN113548134A (en) * | 2021-06-28 | 2021-10-26 | 神龙汽车有限公司 | System and method for calculating ventilation noise of air conditioner |
| CN113548134B (en) * | 2021-06-28 | 2022-04-29 | 神龙汽车有限公司 | System and method for calculating ventilation noise of air conditioner |
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