CN211742643U - Vehicle-mounted noise reduction control device - Google Patents
Vehicle-mounted noise reduction control device Download PDFInfo
- Publication number
- CN211742643U CN211742643U CN202020250208.XU CN202020250208U CN211742643U CN 211742643 U CN211742643 U CN 211742643U CN 202020250208 U CN202020250208 U CN 202020250208U CN 211742643 U CN211742643 U CN 211742643U
- Authority
- CN
- China
- Prior art keywords
- signal
- vehicle
- error
- vibration signal
- control platform
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
Abstract
The utility model discloses a control device that makes an uproar falls in on-vehicle, include: the vibration signal acquisition unit is used for acquiring a current vibration signal of the current state of the vehicle and sending the current vibration signal to the control platform; the control platform calculates and generates a prediction signal at the next moment according to the received current vibration signal, and actively sends an original vibration signal at the previous moment to the error signal adjusting unit; the error signal adjusting unit is used for receiving the original vibration signal of the control platform and a low-frequency road noise signal existing in the vehicle, synthesizing the original vibration signal and the low-frequency road noise signal, generating an error noise signal and sending the error noise signal to the adaptive filter; the adaptive filter adjusts parameters according to the received error noise signal and in combination with the current vibration signal and then sends the adjusted parameters to the control platform, and the control platform generates a prediction signal at the next moment according to the adjusted parameters. The utility model provides a current adoption passive noise reduction system can't effectively carry out the problem that effectively reduces or eliminate low frequency noise in the car.
Description
Technical Field
The utility model relates to an automobile manufacturing field, concretely relates to can initiatively reduce on-vehicle controlling means that makes an uproar that falls of noise in car.
Background
With the development of the automobile industry, users have a higher pursuit for the comfort of vehicles, and the noise level in the automobile becomes one of the important factors influencing the competitiveness of products. The mode that traditional noise level reduces mainly falls passively and makes an uproar, through optimizing modes such as car structure, car material, makes a noise reduction of physics, and the development cycle is long, and the flexibility is not good, and the majority can only reduce high frequency noise moreover, to low frequency noise, passive falling makes an uproar more and more difficult to satisfy user expectation, to low frequency noise's elimination, need have more effectual mode of making an uproar that falls.
At present, with the rapid development in the digital field, the active acoustic control technology is gradually emphasized in the NVH (Noise, Vibration, Harshness) field of the whole vehicle. The active acoustic control technology is that the low-frequency noise in the vehicle is mainly counteracted by sensing the noise level in the vehicle and actively sending a waveform opposite to the amplitude and the phase of a noise signal through a response control system.
Therefore, how to design a device capable of actively reducing noise in a vehicle becomes a problem to be solved at present.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the adoption among the prior art and fall the problem that the system of making an uproar can't effectively reduce or eliminate low frequency noise in the car passively.
In order to realize the purpose, the utility model discloses a technical scheme as follows:
a vehicle-mounted noise reduction control device comprises a vibration signal acquisition unit, a noise reduction control unit and a control platform, wherein the vibration signal acquisition unit is used for acquiring a current vibration signal of a vehicle in a current state and sending the current vibration signal to the control platform;
the control platform calculates and generates a prediction signal at the next moment according to the received current vibration signal, and actively sends an original vibration signal at the previous moment to the error signal adjusting unit;
the error signal adjusting unit is used for receiving the original vibration signal of the control platform and a low-frequency road noise signal existing in the vehicle, synthesizing the original vibration signal and the low-frequency road noise signal, generating an error noise signal and sending the error noise signal to the adaptive filter;
the adaptive filter adjusts parameters according to the received error noise signal and in combination with the current vibration signal and then sends the adjusted parameters to the control platform, and the control platform generates a prediction signal at the next moment according to the adjusted parameters.
Further, the error signal adjusting unit comprises a D/a converter, a secondary speaker, an error microphone, and an a/D converter, wherein the D/a converter is connected to the control platform and the secondary speaker, respectively, and the a/D converter is connected to the adaptive filter and the error microphone, respectively.
Further, the vibration signal acquisition unit includes: the vibration control system comprises an acceleration sensor, a preamplifier and an A/D converter, wherein the acceleration sensor amplifies an obtained vibration signal of the vehicle through the preamplifier, converts the vibration signal into a digital signal through the A/D converter and sends the digital signal to a control platform.
Further, a secondary speaker and an error microphone in the error signal adjusting unit are both arranged in the vehicle, wherein the error microphone is used for collecting an original vibration signal sent by the secondary speaker and a low-frequency road noise signal existing in the vehicle, and the number of the error microphones is two or more.
Further, the acceleration sensor is mounted on a vehicle suspension.
Further, the adaptive filter is an LMS adaptive filter, and the control platform is a dSPACE simulation control platform.
Further, a power amplifier is arranged in the secondary loudspeaker, a preamplifier is arranged in the error microphone, and the error microphone is of an MP201 model.
Compared with the prior art, the utility model discloses a control device that makes an uproar falls on-vehicle can be according to the current running state of vehicle to and the current noise signal that error microphone collected and acceleration sensor's current test signal, calculate the noise condition on prejudgement next step, and the corresponding noise cancellation signal that gives the prediction.
Drawings
Fig. 1 is a schematic structural diagram of a vehicle-mounted noise reduction control device according to an embodiment of the present invention;
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention can be embodied in many different forms other than those specifically described herein, and it will be apparent to those skilled in the art that similar modifications can be made without departing from the spirit and scope of the invention, and it is therefore not to be limited to the specific embodiments disclosed below.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Due to the fact that time consumption of sound transmission caused by different paths is different, after the time consumption of sound transmission is overlapped with the response time of a model algorithm, the offset signal arrives far behind the noise signal at the ears of a person, and therefore mutual overlapping of the noise signal and the offset noise signal cannot be achieved in a sound field, and the active noise reduction effect cannot be achieved. Therefore, in the formed closed-loop active noise reduction control system, advanced noise prediction is important. The utility model discloses a control device that makes an uproar falls on-vehicle can be according to the current running state of vehicle to and the current noise signal that error microphone collected and acceleration sensor's current test signal, calculate the noise condition on prejudgement next step, and the corresponding noise cancellation signal that gives the prediction.
Referring to fig. 1, the embodiment of the utility model discloses a control device that makes an uproar falls in on-vehicle, include: the device comprises a vibration signal acquisition unit, a control platform, an error signal adjusting unit and a self-adaptive filter.
And the vibration signal acquisition unit is used for acquiring the vibration signal of the current state of the vehicle and sending the vibration signal to the control platform.
In this embodiment, the vibration signal acquisition unit includes: the vibration detection device comprises an acceleration sensor, a preamplifier and an A/D converter, wherein the acceleration sensor is arranged on a vehicle suspension frame and can be used for more accurately detecting the vibration state of a roller of a vehicle, when the vehicle vibrates, low-frequency or medium-frequency noise can be generated in the vehicle due to the vibration of an engine or a chassis, one or more acceleration sensors can be arranged, the obtained vibration signal of the vehicle passes through the preamplifier, is amplified and then is converted into a digital signal through the A/D converter, and then is sent to a control platform.
And the control platform calculates and generates a prediction signal of the next moment according to the currently received current vibration signal, wherein the prediction signal of the next moment sent by the control platform is an adjusted prediction signal, the noise of the signal is lower than that of the previous moment in principle, the control platform also actively sends the original vibration signal detected at the previous moment to the error signal adjusting unit for calculating a subsequent error signal, and then outputs a normal prediction signal according to the adjusted signal, and the prediction signal is lower than the noise of the previous moment in principle. The control platform in the embodiment comprises a processor, a memory, a display, a communication network and a corresponding electronic circuit, wherein a control program of the random forest prediction model is stored in the memory, a received vibration signal is used as a training sample of the random forest prediction model, and the model automatically outputs a prediction signal of road noise at the next moment. The random forest is one of Bagging methods, the main idea is to combine a plurality of weak predictors, each base classifier has a replaced random sample when extracting a training sample, and the final result obtains a prediction result through voting or averaging, so that the model has high accuracy and generalization capability, and has overfitting resistance and anti-noise capability. In this embodiment, the control platform may be a dSPACE simulation control platform, and the dSPACE real-time simulation system is a software and hardware working platform developed by the germany dSPACE company and based on MATLAB/Simulink control system development and semi-physical simulation, and realizes a completely seamless connection with MATLAB/Simulink/RTW. The dSPACE real-time system has the advantages of strong real-time performance, high reliability, good expandability and the like. The processor in the dSPACE hardware system has high-speed computing capability and is provided with rich I/O support, and a user can combine the processors as required; the software environment is powerful and convenient to use, and comprises a complete set of tools for realizing automatic code generation/downloading and testing/debugging.
And the error signal adjusting unit is used for receiving the original vibration signal of the control platform, sending the original vibration signal through a secondary sound source, taking the original vibration signal as a noise offset signal, synthesizing the original vibration signal and a received low-frequency road noise signal existing in the vehicle, generating an error noise signal, performing analog-to-digital conversion, and sending the error noise signal to the adaptive filter.
In this embodiment, the error signal adjusting unit includes a D/a converter, a secondary speaker, an error microphone, and an a/D converter, the secondary speaker includes a power amplifier therein, the error microphone includes a preamplifier therein, and the microphone preferably adopts an electret microphone, wherein the D/a converter is connected to the control platform and the secondary speaker respectively, of course, the D/a converter may also be located in the secondary speaker, the error microphone is connected to the a/D converter, the a/D converter may also be located in the microphone, and the a/D converter is connected to the adaptive filter and the preamplifier respectively. The noise transmitted by the secondary loudspeaker is the noise at the previous moment and is received by the error microphone, the error microphone collects the low-frequency road surface residual noise existing in the vehicle through the microphone, the low-frequency road surface residual noise and the low-frequency road surface residual noise are superposed to form an error signal, and the error signal is amplified by the preamplifier and then is received through different analog-digital conversion ports. The error microphones are preferably arranged in 2-4 numbers, are respectively arranged at different positions in the vehicle, are collected by a plurality of paths of microphones and are fed back to the adaptive filter to be used as error signals. The error microphone can further adopt an electret microphone of an MP201 model, a preamplifier of a BSWAMA211 is arranged in the error microphone, and the electret microphone has good medium-frequency sound pickup characteristics.
And the self-adaptive filter compares the received error noise signal with the current vibration signal, adjusts parameters and then sends the adjusted parameters to the control platform, and the control platform regenerates a new prediction signal according to the adjusted parameters. In this embodiment, the adaptive filter is an LMS adaptive filter, which is an adaptive filtering algorithm widely used at present, and is repeatedly updated iteratively through an inverse gradient vector of the objective function. And obtaining the parameter value of the adjustment matrix through an LMS algorithm. The signal adjusted by the LMS adaptive filter is sent to the control platform, so that the control platform can effectively combine the adjusted signal with the current actual vibration signal to reduce noise, and the noise generated in the loudspeaker of the control platform can be gradually reduced.
It should be noted that the embodiment of the present invention provides an AD converter, a DA converter, a speaker, a microphone, an acceleration sensor, and an amplifier, which can be replaced by a general circuit component or a fixed chip in the prior art, for example, the AD converter can select a TLC1549IDR or an ADs7829IDRBT model, the DA converter can select a TLC5615C (L) D model, the speaker can select an AD-F8 vehicle speaker produced by audiolift, the acceleration sensor can select an SH-54-188 model, and the amplifier can select a CA3130 operational amplifier, etc., and the present invention realizes the function of reducing noise through their mutual connection relationship.
The vehicle-mounted noise reduction device in the embodiment forms a closed-loop system, particularly continuously collects residual noise through the error microphone to form an error signal, obtains an adjusted parameter value through the adaptive filter, and further changes a sound signal output by the processor, so that the noise of the sound signal is gradually offset and reduced, the whole system is gradually stabilized, and a better noise reduction effect is obtained.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.
Claims (7)
1. An on-vehicle noise reduction control device, characterized by comprising:
the vibration signal acquisition unit is used for acquiring a current vibration signal of the current state of the vehicle and sending the current vibration signal to the control platform;
the control platform calculates and generates a prediction signal at the next moment according to the received current vibration signal, and actively sends an original vibration signal at the previous moment to the error signal adjusting unit;
the error signal adjusting unit is used for receiving the original vibration signal of the control platform and a low-frequency road noise signal existing in the vehicle, synthesizing the original vibration signal and the low-frequency road noise signal, generating an error noise signal and sending the error noise signal to the adaptive filter;
the adaptive filter adjusts parameters according to the received error noise signal and in combination with the current vibration signal and then sends the adjusted parameters to the control platform, and the control platform generates a prediction signal at the next moment according to the adjusted parameters.
2. The on-vehicle noise reduction control device according to claim 1, wherein the error signal adjusting unit includes a D/a converter, a secondary speaker, an error microphone, and an a/D converter, wherein the D/a converter is connected to the control platform and the secondary speaker, respectively, and the a/D converter is connected to the adaptive filter and the error microphone, respectively.
3. The vehicle-mounted noise reduction control device according to claim 1 or 2, wherein the vibration signal acquisition unit includes: the vibration control system comprises an acceleration sensor, a preamplifier and an A/D converter, wherein the acceleration sensor amplifies an obtained vibration signal of the vehicle through the preamplifier, converts the vibration signal into a digital signal through the A/D converter and sends the digital signal to a control platform.
4. The vehicle-mounted noise reduction control device according to claim 2, wherein the secondary speaker and the error microphone in the error signal adjusting unit are both disposed in the vehicle, wherein the error microphone is used for collecting an original vibration signal emitted by the secondary speaker and a low-frequency road noise signal existing in the vehicle, and the number of the error microphones is two or more.
5. The vehicle-mounted noise reduction control apparatus according to claim 3, wherein the acceleration sensor is mounted on a vehicle suspension.
6. The vehicle-mounted noise reduction control device according to claim 1, wherein the adaptive filter is an LMS adaptive filter, and the control platform is a dSPACE simulation control platform.
7. The on-board noise reduction control apparatus according to claim 2, wherein the secondary speaker includes a power amplifier therein, the error microphone includes a preamplifier therein, and the error microphone is of an MP201 type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020250208.XU CN211742643U (en) | 2020-03-04 | 2020-03-04 | Vehicle-mounted noise reduction control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020250208.XU CN211742643U (en) | 2020-03-04 | 2020-03-04 | Vehicle-mounted noise reduction control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211742643U true CN211742643U (en) | 2020-10-23 |
Family
ID=72858877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020250208.XU Active CN211742643U (en) | 2020-03-04 | 2020-03-04 | Vehicle-mounted noise reduction control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211742643U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113135152A (en) * | 2021-03-12 | 2021-07-20 | 上海大学 | Automobile noise reduction system |
| CN115206279A (en) * | 2022-07-06 | 2022-10-18 | 中国第一汽车股份有限公司 | Vehicle noise reduction processing system and method and vehicle |
-
2020
- 2020-03-04 CN CN202020250208.XU patent/CN211742643U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113135152A (en) * | 2021-03-12 | 2021-07-20 | 上海大学 | Automobile noise reduction system |
| CN115206279A (en) * | 2022-07-06 | 2022-10-18 | 中国第一汽车股份有限公司 | Vehicle noise reduction processing system and method and vehicle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104519212B (en) | A kind of method and device for eliminating echo | |
| CN105835804B (en) | For monitoring the method and apparatus that vehicle back occupant takes a seat region | |
| EP2779685B1 (en) | Headphone system | |
| CN107195294B (en) | Active noise reduction method and device for vehicle | |
| CN106143369B (en) | A kind of stroke-increasing electric automobile noise impedance device | |
| KR101737673B1 (en) | Device and method for generating noise for a motor vehicle | |
| CN211742643U (en) | Vehicle-mounted noise reduction control device | |
| CN112087701B (en) | Speaker emulation of microphone for wind detection | |
| CN113689842A (en) | Integrated system for active noise reduction and audio power amplification of automobile | |
| CN108847250A (en) | A kind of orientation noise-reduction method, system and earphone | |
| CN109932152B (en) | Automobile horn resonance detection device and detection method | |
| KR20120060513A (en) | Active noise control apparatus for local control in vehicle and method thereof | |
| CN112509548A (en) | Active noise reduction device and system for outdoor environment noise | |
| CN114286258B (en) | Current sound cancellation method, device, earphone and computer readable storage medium | |
| CN112866877B (en) | Speaker control method, speaker control device, electronic apparatus, and storage medium | |
| CN116312622A (en) | Abnormal sound detection method, device and system | |
| JP2016192587A (en) | Portable terminal, sound field correction method and program | |
| CN110460949B (en) | Earphone production and detection method | |
| CN209070361U (en) | A kind of active noise reduction system system for testing stability | |
| CN113766385A (en) | Earphone noise reduction method and device | |
| CN107230482A (en) | A kind of active noise reduction system and method for multiple spot feedback | |
| JP2016192585A (en) | Portable terminal, sound field correction method and program | |
| CN118310621B (en) | Vehicle window vibration detection method, vehicle window vibration detection system, vehicle and storage medium | |
| CN109462785B (en) | Audio processing method and transmitter receiver | |
| CN118714501B (en) | Hearing aid in-ear detection method and hearing aid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |