CN102837654A - Interior noise electronic active inhibition system - Google Patents
Interior noise electronic active inhibition system Download PDFInfo
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- CN102837654A CN102837654A CN201210164564XA CN201210164564A CN102837654A CN 102837654 A CN102837654 A CN 102837654A CN 201210164564X A CN201210164564X A CN 201210164564XA CN 201210164564 A CN201210164564 A CN 201210164564A CN 102837654 A CN102837654 A CN 102837654A
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Abstract
The invention discloses an interior noise electronic active inhibition system, which comprises an acoustic sensor, a signal conditioning module, an analog/digital (A/D) conversion module, an electronic control unit (ECU), a digital/analog (D/A) conversion module and a loudspeaker, wherein an automobile noise signal acquired by the acoustic sensor is trimmed by the signal conditioning module, is converted by the A/D conversion module and is input into the ECU; the ECU performs spectral analysis on the signal, separates the frequency band sensitive to the ears of a human body, detects the waveform through a Fourier algorithm and extracts noise envelope, so that waveform approximately similar to the noise waveform is formed and is subjected to reversal processing; and the inverse phase noise processed by the ECU is converted into a sinusoidal analog signal through the D/A conversion module and is input everywhere by the loudspeaker to be superposed with the automobile noise, and the aim of actively inhibiting the interior noise is fulfilled. The interior noise is actively inhibited through an active noise control method.
Description
Technical field
The present invention relates to the improvement that a kind of internal car noise suppresses system, the internal car noise electronics that particularly a kind of ability actv. initiatively suppresses low-frequency noise in the car initiatively suppresses system, belongs to the systems technology field that automobile intelligent monitoring and environment inside car improve.
Background technology
Along with growing with each passing day of automobile pollution, automobile has become one of main source of modern society's city noise pollution.In recent years; Developing rapidly of Domestic Automotive Industry and building in a large number of high-grade highway improve constantly the average ground speed of automobile, cause car noise increasingly high; And internal car noise also so gradually receives people's attention for the influence of ride of vehicle and customer satisfaction degree.Relevant experiment shows; Internal car noise is easy to make chaufeur and passenger to produce psychoreactions such as anxiety, mood be irritated, tired, absent minded; Reduced ride of vehicle,, and brought potential safety hazard for going of automobile people's health generation chronic hazard.The method of tradition control noise emission mainly adopts the Passive Shape Control technology, promptly adopts acoustic method noise reductions such as sound absorption, sound insulation.Yet since the sound attenuation performance of sound absorption, sound deadener with the reduction of frequency variation, passive noise control mechanism centering, high band noise are comparatively effective, and little to the low-frequency noise effect.
Summary of the invention
The present invention seeks to provide a kind of and can actv. suppress initiatively that a kind of internal car noise electronics of low-frequency noise initiatively suppresses system in the car for the deficiency that overcomes prior art.
For achieving the above object, the technical scheme that the present invention adopts is: a kind of internal car noise electronics initiatively suppresses system, comprises acoustic sensor, signal condition module, A/D analog-to-digital conversion module, ECU electronic control unit, D/A D/A converter module, loud speaker; The car noise signal that said acoustic sensor obtains is earlier through the arrangement of signal condition module, again by A/D analog-to-digital conversion module conversion back input ECU electronic control unit; Said ECU electronic control unit carries out spectral analysis to signal; Isolate the comparatively frequency range of sensitivity of people's ear, through Fourier algorithm waveform is detected simultaneously, extract noise envelope; Form the waveform roughly similar with this, and it is done anti-phase handle with noise waveform; After anti-phase noise after the ECU electronic control unit is handled converts sinusoidal analog signal into through the D/A D/A converter module, be input to everywhere and the car noise stack, reach the purpose that initiatively suppresses internal car noise by loud speaker.
Preferably; Said internal car noise electronics initiatively suppresses system, also comprises error microphone, when described error microphone collects the fluctuation signal of car noise; Described ECU electronic control unit combines the car noise information of acoustic sensor acquisition and the fluctuation signal that error microphone collects car noise; Through its adaptation function oneself adjustment data, after the anti-phase noise after said ECU electronic control unit is handled according to adjustment data converts sinusoidal analog signal into through the D/A D/A converter module, be input to noise source everywhere by loud speaker; With the internal car noise stack, reach the purpose that initiatively suppresses internal car noise.
Preferably, said signal condition module is carried out processing and amplifying to the car noise signal of acoustic sensor collection and the car noise fluctuation signal of error microphone collection, makes it reach said A/D analog-to-digital conversion module and ECU electronic control unit ability identified range.
Preferably, said acoustic sensor places near the car intrinsic motivation and the good locations of car chassis acquisition noise, is convenient to the collection internal car noise of maximum range; When detecting the vapour startup; The noise of auto body and engine producing is by the acoustic sensor collection; Acoustic sensor is an electric signal with the signal transition that collects; Through said signal condition module it is carried out processing and amplifying, and import said ECU electronic control unit via said A/D analog-to-digital conversion module and handle.
Preferably, said error microphone is used to detect the automotive interior fluctuation of noise everywhere; When detecting the noise fluctuations that automobile bumpiness or driving engine quicken to cause; Said error microphone real-time with the noise fluctuations acquisition of signal; Carry out processing and amplifying through the signal condition module, and handle via the said ECU electronic control unit of input behind the said A/D analog-to-digital conversion module.
Preferably, said ECU electronic control unit has local suppression mode, when judging that the speed of a motor vehicle is in part inhibition scope; Said ECU electronic control unit carries out frequency spectrum through algorithm to noise to be separated; Isolate the noise in 500Hz ~ 2000Hz scope, pass through Fourier algorithm simultaneously, form the waveform roughly similar with noise waveform with this to the noise extraction envelope; And it is done anti-phase handle; After anti-phase noise after said ECU electronic control unit is handled converts sinusoidal analog signal into through the D/A D/A converter module, be input to everywhere and the car noise stack, reach the purpose that initiatively suppresses internal car noise by loud speaker.
Preferably, said ECU electronic control unit has overall suppression mode, when judging that the speed of a motor vehicle is in overall situation inhibition scope; Said ECU electronic control unit carries out frequency spectrum through algorithm to noise to be separated; Isolate the noise in this section of 20Hz ~ 20KHz people ear ability identified range, pass through Fourier algorithm simultaneously, form the waveform roughly similar with noise waveform with this to the noise extraction envelope; And it is done anti-phase handle; After anti-phase noise after said ECU electronic control unit is handled converts sinusoidal analog signal into through the D/A D/A converter module, be input to everywhere and the car noise stack, reach the purpose that initiatively suppresses internal car noise by loud speaker.
Preferably; Said ECU electronic control unit is to include but not limited to that devices such as MCU or DSP or CPLD or MPU microprocessor are its main operational treater, intellectual analysis, judgement and a decision system holding concurrently and constitute with other auxiliary circuit and fuzzy logic algorithm.
Because the utilization of technique scheme, the present invention compared with prior art has advantage:
Initiatively inhibition system of internal car noise electronics of the present invention passes through acoustic sensor from auto body and driving engine acquisition noise; Through error microphone from acquisition noise fluctuation informations such as driving engine, tire, vehicle body, chassis; The ECU electronic control unit carries out comprehensive treatment with both combinations; Through Fourier algorithm waveform is detected and handles, extract noise envelope, and it is carried out anti-phase; After anti-phase noise after the ECU electronic control unit is handled converts sinusoidal analog signal into through the D/A D/A converter module; Be input to noise source everywhere by loud speaker, with the internal car noise stack, because the amplitude same phase is opposite; Both disappear mutually in stack, thereby reach the purpose that initiatively suppresses internal car noise; The present invention then adopts the method for Active noise control using initiatively to suppress internal car noise.
Description of drawings
Below in conjunction with accompanying drawing technical scheme of the present invention is described further:
Accompanying drawing 1 initiatively suppresses the fundamental diagram of system for internal car noise electronics of the present invention;
Accompanying drawing 2 initiatively suppresses the overall suppression mode workflow diagram of system for internal car noise electronics of the present invention;
Accompanying drawing 3 suppresses workflow diagram for the part that internal car noise electronics of the present invention initiatively suppresses system.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is done further detailed description.
Initiatively suppress system like accompanying drawing 1,2, the internal car noise electronics of the present invention shown in 3, comprise acoustic sensor, error microphone, signal condition module, A/D analog-to-digital conversion module, ECU electronic control unit, D/A D/A converter module, loud speaker, power supply; When automobile produced car noise, said acoustic sensor was throughout with the noise collection that produces, and the signal of acquisition amplifies through the arrangement of signal condition module; Convert signal into digital signal input ECU electronic control unit behind the said A/D analog-to-digital conversion module picked up signal; Said ECU electronic control unit carries out spectral analysis according to mode of operation to signal; When being operated in overall suppression mode; Then will handle the whole noises that are in people's ear earshot 20Hz ~ 20KHz; Through Fourier algorithm waveform is detected and handles, extract noise envelope, and it is carried out anti-phase; After anti-phase noise after the ECU electronic control unit is handled converts sinusoidal analog signal into through the D/A D/A converter module; Be input to noise source everywhere by loud speaker, with the internal car noise stack, because the amplitude same phase is opposite; Both disappear mutually in stack, thereby reach the purpose that initiatively suppresses internal car noise.When being operated in local suppression mode, then only handle being in the comparatively responsive frequency range 500Hz ~ 2000Hz of people's ear, through Fourier algorithm waveform is detected and handles; Extract noise envelope; And it is carried out anti-phase, the anti-phase noise after the ECU electronic control unit is handled is input to noise source everywhere by loud speaker after converting sinusoidal analog signal into through the D/A D/A converter module; Superpose with internal car noise; Because the amplitude same phase is opposite, both disappear mutually in stack, thereby reach the purpose that initiatively suppresses internal car noise.Because the fugitiveness of car noise and the time delay of system; Can be with importing the ECU electronic control unit through the A/D analog-to-digital conversion module by described error microphone Acquisition Error signal; Through its adaptation function oneself adjustment data, after the anti-phase noise after the ECU electronic control unit is handled according to adjustment data converts sinusoidal analog signal into through the D/A D/A converter module, be input to noise source everywhere by loud speaker; Superpose with internal car noise; Because the amplitude same phase is opposite, both disappear mutually in stack, thereby reach the purpose that initiatively suppresses internal car noise; Said power supply provides electric energy to each parts.Car noise comprises motor noise, tire noise, air-flow noise, chassis noise and other noise source etc.; Wherein, said signal condition module is carried out processing and amplifying to the car noise signal of acoustic sensor collection and the car noise fluctuation signal of error microphone collection, makes it reach said A/D analog-to-digital conversion module and ECU electronic control unit ability identified range; Said acoustic sensor places near the car intrinsic motivation and the good locations of car chassis acquisition noise, is convenient to the collection internal car noise of maximum range; When detecting the vapour startup; The noise of auto body and engine producing is by the acoustic sensor collection; Acoustic sensor is an electric signal with the signal transition that collects; Through said signal condition module it is carried out processing and amplifying, and import said ECU electronic control unit via said A/D analog-to-digital conversion module and handle; Said error microphone is used to detect the automotive interior fluctuation of noise everywhere; When detecting the noise fluctuations that automobile bumpiness or driving engine quicken to cause; Said error microphone real-time with the noise fluctuations acquisition of signal; Carry out processing and amplifying through the signal condition module, and handle via the said ECU electronic control unit of input behind the said A/D analog-to-digital conversion module; Said ECU electronic control unit is to include but not limited to that devices such as MCU or DSP or CPLD or MPU microprocessor are its main operational treater, intellectual analysis, judgement and a decision system holding concurrently and constitute with other auxiliary circuit and fuzzy logic algorithm.
Initiatively inhibition system of internal car noise electronics of the present invention passes through acoustic sensor from auto body and driving engine acquisition noise; Through error microphone from acquisition noise fluctuation informations such as driving engine, tire, vehicle body, chassis; The ECU electronic control unit carries out comprehensive treatment with both combinations; When judging that the speed of a motor vehicle is in part inhibition scope, the ECU electronic control unit will be in local suppression mode, noise signal carried out frequency spectrum separate; Isolate the comparatively responsive frequency range noise of this section of 500Hz ~ 2000Hz people ear; Through an algorithm noise is carried out envelope extraction simultaneously, forms and the roughly the same envelope waveform of noise waveform, and to the processing noise phase place do the anti-phase processing; If the speed of a motor vehicle exceeds certain limit; The ECU electronic control unit will be converted to overall suppression mode; Isolate the frequency range noise of noise intermediate frequency spectrum at 20Hz ~ 20KHz; Through another algorithm noise is carried out envelope extraction simultaneously, forms and the roughly the same envelope waveform of noise waveform, and to the processing noise phase place do the anti-phase processing; Under two kinds of patterns, all to its noise fluctuations information that combines error microphone be made certain phase shift to noise signal, make the tracking noise source that it can be real-time and the variation of environmental parameters, the multiple intensity of automatically regulating secondary sound source is to last state; After anti-phase noise after the ECU electronic control unit is handled converts sinusoidal analog signal into through the D/A D/A converter module; Be input to noise source everywhere by loud speaker, with the internal car noise stack, because the amplitude same phase is opposite; Both disappear mutually in stack, thereby reach the purpose that initiatively suppresses internal car noise.
The foregoing description only is explanation technical conceive of the present invention and characteristics; Its purpose is to let the personage that is familiar with this technology can understand content of the present invention and implements; Can not limit protection scope of the present invention with this; All equivalences that spirit is done according to the present invention change or modify, and all should be encompassed in protection scope of the present invention.
Claims (8)
1. an internal car noise electronics initiatively suppresses system, it is characterized in that: comprise acoustic sensor, signal condition module, A/D analog-to-digital conversion module, ECU electronic control unit, D/A D/A converter module, loud speaker; The car noise signal that said acoustic sensor obtains is earlier through the arrangement of signal condition module, again by A/D analog-to-digital conversion module conversion back input ECU electronic control unit; Said ECU electronic control unit carries out spectral analysis to signal; Isolate the comparatively frequency range of sensitivity of people's ear, through Fourier algorithm waveform is detected simultaneously, extract noise envelope; Form the waveform roughly similar with this, and it is done anti-phase handle with noise waveform; After anti-phase noise after the ECU electronic control unit is handled converts sinusoidal analog signal into through the D/A D/A converter module, be input to everywhere and the car noise stack, reach the purpose that initiatively suppresses internal car noise by loud speaker.
2. internal car noise electronics according to claim 1 initiatively suppresses system; It is characterized in that: also comprise error microphone; When described error microphone collected the fluctuation signal of car noise, described ECU electronic control unit combined the car noise information of acoustic sensor acquisition and the fluctuation signal that error microphone collects car noise, through its adaptation function oneself adjustment data; After anti-phase noise after said ECU electronic control unit is handled according to adjustment data converts sinusoidal analog signal into through the D/A D/A converter module; Be input to noise source everywhere by loud speaker,, reach the purpose that initiatively suppresses internal car noise with the internal car noise stack.
3. internal car noise electronics according to claim 1 and 2 initiatively suppresses system; It is characterized in that: said signal condition module is carried out processing and amplifying to the car noise signal of acoustic sensor collection and the car noise fluctuation signal of error microphone collection, makes it reach said A/D analog-to-digital conversion module and ECU electronic control unit ability identified range.
4. basic internal car noise electronics according to claim 1 and 2 initiatively suppresses system, it is characterized in that: said acoustic sensor places near the car intrinsic motivation and the good locations of car chassis acquisition noise, is convenient to the collection internal car noise of maximum range; When detecting the vapour startup; The noise of auto body and engine producing is by the acoustic sensor collection; Acoustic sensor is an electric signal with the signal transition that collects; Through said signal condition module it is carried out processing and amplifying, and import said ECU electronic control unit via said A/D analog-to-digital conversion module and handle.
5. internal car noise electronics according to claim 1 and 2 initiatively suppresses system, it is characterized in that: said error microphone is used to detect the automotive interior fluctuation of noise everywhere; When detecting the noise fluctuations that automobile bumpiness or driving engine quicken to cause; Said error microphone real-time with the noise fluctuations acquisition of signal; Carry out processing and amplifying through the signal condition module, and handle via the said ECU electronic control unit of input behind the said A/D analog-to-digital conversion module.
6. internal car noise electronics according to claim 1 and 2 initiatively suppresses system; It is characterized in that: said ECU electronic control unit has local suppression mode; When judging that the speed of a motor vehicle is in part inhibition scope, said ECU electronic control unit carries out frequency spectrum through algorithm to noise to be separated, and isolates the noise in 500Hz ~ 2000Hz scope; Pass through Fourier algorithm simultaneously to the noise extraction envelope; Form the waveform roughly similar with this, and it is done anti-phase handle, after the anti-phase noise after said ECU electronic control unit is handled converts sinusoidal analog signal into through the D/A D/A converter module with noise waveform; Be input to everywhere and the car noise stack by loud speaker, reach the purpose that initiatively suppresses internal car noise.
7. internal car noise electronics according to claim 1 and 2 initiatively suppresses system; It is characterized in that: said ECU electronic control unit has overall suppression mode; When judging that the speed of a motor vehicle is in overall situation inhibition scope, said ECU electronic control unit carries out frequency spectrum through algorithm to noise to be separated, and isolates the noise in this section of 20Hz ~ 20KHz people ear ability identified range; Pass through Fourier algorithm simultaneously to the noise extraction envelope; Form the waveform roughly similar with this, and it is done anti-phase handle, after the anti-phase noise after said ECU electronic control unit is handled converts sinusoidal analog signal into through the D/A D/A converter module with noise waveform; Be input to everywhere and the car noise stack by loud speaker, reach the purpose that initiatively suppresses internal car noise.
8. internal car noise electronics according to claim 1 and 2 initiatively suppresses system; It is characterized in that: said ECU electronic control unit is to include but not limited to that devices such as MCU or DSP or CPLD or MPU microprocessor are its main operational treater, intellectual analysis, judgement and a decision system holding concurrently and constitute with other auxiliary circuit and fuzzy logic algorithm.
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| CN103863218A (en) * | 2014-03-19 | 2014-06-18 | 重庆交通大学 | Anti-chronic-tinnitus automatic protection method and device of automobile |
| CN104002750A (en) * | 2014-05-30 | 2014-08-27 | 长城汽车股份有限公司 | Control device for eliminating roars in car |
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| CN104691460A (en) * | 2013-11-08 | 2015-06-10 | 沃尔沃汽车公司 | Method and system for masking noise |
| CN104808670A (en) * | 2015-04-29 | 2015-07-29 | 成都陌云科技有限公司 | Intelligent interacting robot |
| CN104908688A (en) * | 2015-05-20 | 2015-09-16 | 浙江吉利汽车研究院有限公司 | Method and device for active noise reduction of vehicle |
| CN105040940A (en) * | 2015-06-30 | 2015-11-11 | 南京常荣声学股份有限公司 | Unit acoustic panel absorber device based on sound absorption and production self-balancing principle |
| CN105263088A (en) * | 2015-10-21 | 2016-01-20 | 莆田市云驰新能源汽车研究院有限公司 | Automobile noise reduction method and system |
| CN105872908A (en) * | 2016-05-23 | 2016-08-17 | 北京长安汽车工程技术研究有限责任公司 | Denoising method and device for brake system |
| CN106210062A (en) * | 2016-07-15 | 2016-12-07 | 广西神州环保设施运营有限责任公司 | Ecological replacement type cell management system and control method thereof |
| CN106671912A (en) * | 2015-11-06 | 2017-05-17 | 现代自动车株式会社 | Vehicle combustion noise-masking control apparatus and method of using the same |
| CN107086034A (en) * | 2016-11-03 | 2017-08-22 | 北京安声科技有限公司 | A kind of vehicle-mounted active noise reduction system and method |
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| CN108344504A (en) * | 2018-05-02 | 2018-07-31 | 莆田学院 | Noise detection system and analysis method in 8 road car of one kind |
| CN108597489A (en) * | 2018-04-21 | 2018-09-28 | 中车青岛四方机车车辆股份有限公司 | A kind of bullet train car Active noise control system |
| CN109429144A (en) * | 2017-08-31 | 2019-03-05 | 通用汽车环球科技运作有限责任公司 | System and method for eliminating the bad wind noise in compartment |
| CN111251990A (en) * | 2018-12-03 | 2020-06-09 | 广州汽车集团股份有限公司 | Control method and system for external warning sound of electric vehicle |
| CN111754971A (en) * | 2020-07-10 | 2020-10-09 | 昆山泷涛机电设备有限公司 | Active noise reduction intelligent container system and active noise reduction method |
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| CN104691460B (en) * | 2013-11-08 | 2018-10-23 | 沃尔沃汽车公司 | Method and system for shielding noise |
| CN103863218A (en) * | 2014-03-19 | 2014-06-18 | 重庆交通大学 | Anti-chronic-tinnitus automatic protection method and device of automobile |
| CN104002750B (en) * | 2014-05-30 | 2016-06-29 | 长城汽车股份有限公司 | A kind of control device eliminating the noise that thunders in car |
| CN104002750A (en) * | 2014-05-30 | 2014-08-27 | 长城汽车股份有限公司 | Control device for eliminating roars in car |
| CN104149687A (en) * | 2014-07-29 | 2014-11-19 | 浪潮集团有限公司 | Active noise reduction device suitable for car |
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| CN104908688A (en) * | 2015-05-20 | 2015-09-16 | 浙江吉利汽车研究院有限公司 | Method and device for active noise reduction of vehicle |
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| CN108597489A (en) * | 2018-04-21 | 2018-09-28 | 中车青岛四方机车车辆股份有限公司 | A kind of bullet train car Active noise control system |
| CN108344504A (en) * | 2018-05-02 | 2018-07-31 | 莆田学院 | Noise detection system and analysis method in 8 road car of one kind |
| CN111251990A (en) * | 2018-12-03 | 2020-06-09 | 广州汽车集团股份有限公司 | Control method and system for external warning sound of electric vehicle |
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