CN204113385U - The active active sound eliminating system of a kind of engine exhaust - Google Patents
The active active sound eliminating system of a kind of engine exhaust Download PDFInfo
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- CN204113385U CN204113385U CN201420042192.8U CN201420042192U CN204113385U CN 204113385 U CN204113385 U CN 204113385U CN 201420042192 U CN201420042192 U CN 201420042192U CN 204113385 U CN204113385 U CN 204113385U
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Exhaust Silencers (AREA)
Abstract
The utility model discloses the active active sound eliminating system of a kind of engine exhaust, the active active sound eliminating system of this engine exhaust comprises: sound transducer, voltage follower circuit module, signal processor, D/A conversion module, power amplifier, secondary sound source module.The utility model adopts electronic sensor, signal transacting and active sound source interaction noise sound source to reach the effect of stress release treatment, on low-frequency noise is eliminated the noise, obtain good effect.The utility model adopts initiatively eliminates the noise, compensate for the deficiency of conventional muffler well, active active silencer effectively can eliminate the low frequency range noise that engine exhaust produces, simultaneously the efficient back pressure reducing engine ignition order and produce, reduce silencing apparatus size, improve engine performance.
Description
Technical field
The utility model belongs to automobile noise reduction technical field, particularly relates to the active active sound eliminating system of a kind of engine exhaust.
Background technique
Along with the raising gradually of quality of life, people are also more and more higher for the requirement of automobile comfort level, and the noise and vibration produced when motor car engine is run is then the important factor in order of automobile comfort level.In recent years, the equal idea of Ge great automobile vendor manages to improve conventional muffler performance, researches and develops Novel silencing system simultaneously.In this context, this Novel silencing system being different from traditional sound-attenuating system of active sound eliminating system has just been given birth to because of fortune.
The existing engine exhaust muffler overwhelming majority or traditional acoustic wave filter structure, namely by reducing the pulsation of exhaust pressure and decay exhaust pressure gradually, make exhaust energy dissipation totally.Concrete acoustic wave filter structure then mainly contains absorption, interfere type, expanssion type, and resonant.The silencing apparatus of practical application mostly is the combination of these citation forms.
Silencing apparatus in existing automobile engine exhaust system generally adopts traditional passive passive silencing apparatus, and traditional silencing apparatus is better for the exhaust sound soundproof effect of high band, but then not fully up to expectations for the elimination of the exhaust sound of low-frequency range.
The major defect of existing silencing apparatus is poor to the soundproof effect of engine exhaust low frequency range noise, when administering low-frequency noise, its design size must be increased, not only increase manufacture cost, and add installing space demand and installation difficulty, " effect and cost rate " is very low; Conventional muffler internal structure is complicated in addition, and gas-flow resistance is large, and exhaust back pressure is high, reduces complete machine power character and the Economy of motor.
Model utility content
The object of the utility model embodiment is to provide a kind of engine exhaust active active sound eliminating system, is intended to the problem to engine exhaust low frequency range noise soundproof effect difference solving the existence of existing silencing apparatus.
The utility model embodiment realizes like this, the active active sound eliminating system of a kind of engine exhaust, the active active sound eliminating system of this engine exhaust comprises: sound transducer, voltage follower circuit module, signal processor, D/A conversion module, power amplifier, secondary sound source module;
Sound transducer, for detecting the intensity of sound of noise source, exporting the AD converter collection that can use 3.3V and 5V benchmark, realizing carrying out interaction according to sound size;
Voltage follower circuit module, is connected with sound transducer, and the voltage signal for being collected by sound transducer carries out following process, and increase input resistance, the magnitude of voltage that AD converter is gathered is closer to actual value.
Signal processor, with voltage follower circuit model calling, for carrying out anti-phase process to following the voltage signal after process, completes the conversion to voltage signal;
D/A conversion module, is connected with signal processor, and the output signal for the anti-phase process by complete for signal processor pair signals carries out the digital-to-analog conversion of DA, is converted to analog voltage signal, and exports power amplifier to;
Power amplifier, is connected with D/A conversion module, and the signal for D/A conversion module output carries out the needs amplifying to meet secondary sound source module;
Secondary sound source module, is connected with power amplifier, for sending low-frequency sound wave.
Further, voltage follower circuit module is by 5V power voltage supply, and concrete connection is:
The 1+ pin of chip LM358 receives the electrical signal from sound transducer, and is connected with electric capacity C8 and resistance R21; The 1-pin of chip LM358 is connected with OUT1 pin and is connected with resistance R23 with electric capacity C10; The Vin pin of chip LM358 is connected with 5V voltage; AGND pin is connected with the ground of circuit.
Further, the concrete connection of D/A module circuit is:
The DIN pin of TLC5615 chip is connected with the MOSI pin of single-chip microcomputer, the SCLK pin of TLC5615 chip is connected with the SCK pin of single-chip microcomputer, the CS pin of TLC5615 chip is connected with the common IO pin of single-chip microcomputer, the DOUT pin of TLC5615 chip is connected with the MISO pin of single-chip microcomputer, the VCC pin of TLC5615 chip is connected with+5V, the OUT pin of TLC5615 chip is connected with the input pin of power magnification circuit, the REF pin of TLC5615 chip is connected with+5V, and the GND pin of TLC5615 chip is connected with ground.
Further, sound transducer adopts analog transducer.
Further, power amplifier adopts TEA2025 power amplifier integration module.
Further, secondary sound source module adopts full range electric metal wafer speaker.
The active active sound eliminating system of the engine exhaust that the utility model provides, adopt electronic sensor, signal transacting and and initiatively sound source interaction noise sound source reach the effect of stress release treatment, on low-frequency noise is eliminated the noise, obtain good effect.The utility model adopts initiatively eliminates the noise, compensate for the deficiency of conventional muffler well, active active silencer effectively can eliminate the low frequency range noise that engine exhaust produces, simultaneously the efficient back pressure reducing engine ignition order and produce, reduce silencing apparatus size, improve engine performance.
Accompanying drawing explanation
Fig. 1 is the active active sound eliminating system structural representation of engine exhaust that the utility model embodiment provides;
In figure: 1, sound transducer; 2, voltage follower circuit module; 3, signal processor; 4, D/A conversion module; 5, power amplifier; 6, secondary sound source module;
Fig. 2 is the principle schematic of the active active sound eliminating system of engine exhaust that the utility model embodiment provides;
In figure: 7, MIC microphone; 8, voltage follower circuit; 9, signal processing module; 10, power amplifier; 11, loudspeaker;
Fig. 3 is the circuit connection diagram of the voltage follower circuit module that the utility model embodiment provides;
Fig. 4 is the D/A conversion module circuit diagram that the utility model embodiment provides;
Fig. 5 is the 100Hz sine wave noise elimination front and back comparison diagram that the utility model embodiment provides.
Embodiment
In order to make the purpose of this utility model, technological scheme and advantage clearly understand, below in conjunction with embodiment, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Below in conjunction with drawings and the specific embodiments, application principle of the present utility model is further described.
As shown in Figure 1, the active active sound eliminating system of the engine exhaust of the utility model embodiment forms primarily of sound transducer 1, voltage follower circuit module 2, signal processor 3, D/A conversion module 4, power amplifier 5, secondary sound source module 6;
Sound transducer 1, for detecting the intensity of sound of noise source, exporting the AD converter collection that can use 3.3V and 5V benchmark, realizing carrying out interaction according to sound size;
Voltage follower circuit module 2, is connected with sound transducer 1, and the voltage signal for being collected by sound transducer 1 carries out following process, and the voltage signal after process is passed to signal processor 3;
Signal processor 3, is connected with voltage follower circuit module 2, carrying out anti-phase process, completing the conversion to voltage signal for following the voltage signal after process to voltage follower circuit module 2;
D/A conversion module 4, is connected with signal processor 3, and the output signal for the anti-phase process by complete for signal processor 3 pair signals carries out the digital-to-analog conversion of DA, is converted to analog voltage signal, and exports power amplifier 5 to;
Power amplifier 5, is connected with D/A conversion module 4, and the signal for D/A conversion module 4 output carries out the needs amplifying to meet secondary sound source module 6;
Secondary sound source module 6, is connected with power amplifier 5, for sending low-frequency sound wave.
As shown in Figure 3, voltage follower circuit module 2 is by 5V power voltage supply, and the 1+ pin of chip LM358 receives the electrical signal from sound transducer, and is connected with electric capacity C8 and resistance R21; The 1-pin of chip LM358 is connected with OUT1 pin and is connected with resistance R23 with electric capacity C10; The Vin pin of chip LM358 is connected with 5V voltage; AGND pin is connected with the ground of circuit.
As shown in Figure 4, the DIN pin of the TLC5615 chip of D/A conversion module circuit 4 is connected with the MOSI pin of single-chip microcomputer, the SCLK pin of TLC5615 chip is connected with the SCK pin of single-chip microcomputer, the CS pin of TLC5615 chip is connected with the common IO pin of single-chip microcomputer, the DOUT pin of TLC5615 chip is connected with the MISO pin of single-chip microcomputer, the VCC pin of TLC5615 chip is connected with+5V, the OUT pin of TLC5615 chip is connected with the input pin of power magnification circuit, the REF pin of TLC5615 chip is connected with+5V, and the GND pin of TLC5615 chip is connected with ground.
Working principle of the present utility model: sound transducer 1, for detecting the intensity of sound of noise source, output can use the AD converter collection of 3.3V and 5V benchmark, realize carrying out interactive effect according to sound size, sound transducer 1 is analog transducer, only need an analog transducer dedicated data line, just can be combined with sensor expansion board, the signal gathered sends into voltage follower circuit module 2, sensor assembly is powered: 3-12VDC, amplitude output signal: 0-VCC/2 and output amplitude is adjustable.
The voltage signal that voltage follower circuit module 2 is used for being collected by sound transducer 1 carries out following process, and by signal transmission to signal processor 3, voltage follower circuit part is by 5V power voltage supply, voltage signal after signal processor 3 pairs of voltage follower circuit modules 2 follow process processes, wherein AD converter completes the conversion to voltage signal, and by the anti-phase process of the complete pair signals of single-chip microcomputer, then processing signals exports D/A conversion module 4 to, the output signal of the anti-phase process of complete for single-chip microcomputer pair signals is carried out DA digital-to-analog conversion by D/A conversion module 4, be converted to analog voltage signal, and export power amplifier 5 to, D/A conversion module 4 adopts TLC5615, TLC5615 is the digital to analog converter with serial line interface, it exports as voltage-type, maximum output voltage is the twice of reference voltage value.In the utility model, TLC5615 adopts SPI serial transmission towards the interface of singlechip CPU, its maximum transfer speed is 1.21Mhz, DA conversion time is 12.5us, TLC5615 conversion accuracy 10bit, exporting after changing is voltage, maximum output voltage is VDD-0.4V, logic voltage input 5V (+-5%), according to the logic level of 5V, its maximum input voltage is 4.6V, power amplifier 5 adopts TEA2025 power amplifier integration module, directly the signal that D/A conversion module 4 exports can be carried out the needs amplifying to meet described secondary sound source, secondary sound source module 6 adopts full range electrodynamic type metallic thin film loudspeaker, to meet the needs sending low-frequency sound wave.
With analysis, the utility model is described further with the following Examples:
Active Noise Control (Active Noise Control, be called for short ANC) be principle according to two sound wave destructive interference or Reduction of acoustic radiation, produce by offsetting sound source (secondary sound source) and be cancelled sound source (elementary sound source) acoustic pressure equal and opposite in direction, the acoustic irradiation that phase place is contrary, cancel out each other, thus reach the object reducing noise.Schematic diagram of the present utility model as shown in Figure 2.The utility model for be engine exhaust conduit eliminate the noise, so system structurally be arranged through exhaust line upstream adopt before microphone 7 pick-up noise signal, and by sensor assembly, acoustic signal is converted to voltage signal, after voltage follower circuit 8 processes, pass to signal processing module 9 pairs of voltage signals and carry out anti-phase process, again the signal after process is fed to after power amplifier 10 processes the secondary sound source (loudspeaker 11) of pipe downstream, the amplitude making it send noise signal former in upstream is equal, the sound wave that phase place is contrary, thus and reach the object eliminating exhaust sound.
In order to verify the correctness that active active noise elimination is theoretical, employing Cool Edit Pro software and having carried out the simulation that active active is eliminated the noise.Utilize Cool Edit Pro software to generate the sine wave of 100Hz respectively, this sine wave is positioned over L channel, and R right is quiet, saves as " anti-phase front .wav file.And then use anti-phase order in this software, R right generates equal with L channel amplitude, the same frequency sine wave that phase place is contrary, save as " anti-phase rear .wav " file.
Finally, play two .wav files under same frequency respectively, and gather, compare.A loudspeaker is only had to sound when playing anti-phase front wave file, get off as original audio signal recording, when play anti-phase after wave file time, the waveform that real-time constant amplitude that what two loudspeakers sent is is anti-phase, one can regard noise source as, another can regard the secondary sound source of Active Noise Control as, and two sound sources can produce the anti-phase destructive interference phenomenon of sound wave propagating in pick-up process.The sinusoidal wave general noise reduction in front and back that processes through eliminating the noise, at about 20dB, accounts for about 25% of total volume.
In addition, in order to study the control effects of Active Noise Control at engine exhaust conduit further, under also having done motor typical condition, exhaust sound interferes noise elimination Control release.Experiment still uses Cool Edit Pro software, and processing method and upper saves identical.The noise waveform of anti-phase front and back respectively as shown in Figure 5.Show that active sound eliminating system is feasible for eliminating the idea of engine exhaust noise through simulation checking.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (6)
1. the active active sound eliminating system of engine exhaust, is characterized in that, the active active sound eliminating system of this engine exhaust comprises: sound transducer, voltage follower circuit module, signal processor, D/A conversion module, power amplifier, secondary sound source module;
For detecting the intensity of sound of noise source, exporting the AD converter collection that can use 3.3V and 5V benchmark, realizing carrying out interactive sound transducer according to sound size;
Be connected with sound transducer, the voltage signal for being collected by sound transducer carries out following process, and increase input resistance, the magnitude of voltage that AD converter is gathered is closer to the voltage follower circuit module of actual value;
With voltage follower circuit model calling, for carrying out anti-phase process to following the voltage signal after process, complete the signal processor of the conversion to voltage signal;
Be connected with signal processor, the output signal for the anti-phase process by complete for signal processor pair signals carries out the digital-to-analog conversion of DA, is converted to analog voltage signal, and exports the D/A conversion module of power amplifier to;
Be connected with D/A conversion module, the signal for D/A conversion module output carries out the power amplifier amplifying to meet secondary sound source module needs;
Be connected with power amplifier, for sending the secondary sound source module of low-frequency sound wave.
2. the active active sound eliminating system of engine exhaust as claimed in claim 1, it is characterized in that, voltage follower circuit module is by 5V power voltage supply, and concrete connection is:
The 1+ pin of chip LM358 receives the electrical signal from sound transducer, and is connected with electric capacity C8 and resistance R21; The 1-pin of chip LM358 is connected with OUT1 pin and is connected with resistance R23 with electric capacity C10; The Vin pin of chip LM358 is connected with 5V voltage; AGND pin is connected with the ground of circuit.
3. the active active sound eliminating system of engine exhaust as claimed in claim 1, it is characterized in that, the concrete connection of D/A conversion module circuit is:
The DIN pin of TLC5615 chip is connected with the MOSI pin of single-chip microcomputer, the SCLK pin of TLC5615 chip is connected with the SCK pin of single-chip microcomputer, the CS pin of TLC5615 chip is connected with the common IO pin of single-chip microcomputer, the DOUT pin of TLC5615 chip is connected with the MISO pin of single-chip microcomputer, the VCC pin of TLC5615 chip is connected with+5V, the OUT pin of TLC5615 chip is connected with the input pin of power magnification circuit, the REF pin of TLC5615 chip is connected with+5V, and the GND pin of TLC5615 chip is connected with ground.
4. the active active sound eliminating system of engine exhaust as claimed in claim 1, is characterized in that, sound transducer adopts analog transducer.
5. the active active sound eliminating system of engine exhaust as claimed in claim 1, is characterized in that, power amplifier adopts TEA2025 power amplifier integration module.
6. the active active sound eliminating system of engine exhaust as claimed in claim 1, is characterized in that, secondary sound source module adopts full range electrodynamic type metallic thin film loudspeaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420042192.8U CN204113385U (en) | 2014-01-23 | 2014-01-23 | The active active sound eliminating system of a kind of engine exhaust |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420042192.8U CN204113385U (en) | 2014-01-23 | 2014-01-23 | The active active sound eliminating system of a kind of engine exhaust |
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| CN204113385U true CN204113385U (en) | 2015-01-21 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529022A (en) * | 2015-12-18 | 2016-04-27 | 东华大学 | Self-adaptive combined integration filtering apparatus and noise control system and method |
| CN108518258A (en) * | 2018-02-28 | 2018-09-11 | 成英 | The standing wave tube of vehicle silencing apparatus acquires noise elimination resonator system |
| CN112709654A (en) * | 2019-10-25 | 2021-04-27 | 陕西汽车集团有限责任公司 | Air inlet system of commercial vehicle and noise reduction method |
-
2014
- 2014-01-23 CN CN201420042192.8U patent/CN204113385U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529022A (en) * | 2015-12-18 | 2016-04-27 | 东华大学 | Self-adaptive combined integration filtering apparatus and noise control system and method |
| CN108518258A (en) * | 2018-02-28 | 2018-09-11 | 成英 | The standing wave tube of vehicle silencing apparatus acquires noise elimination resonator system |
| CN108518258B (en) * | 2018-02-28 | 2020-09-08 | 付万贤 | Standing wave tube collecting, silencing and resonating system of vehicle silencing device |
| CN112709654A (en) * | 2019-10-25 | 2021-04-27 | 陕西汽车集团有限责任公司 | Air inlet system of commercial vehicle and noise reduction method |
| CN112709654B (en) * | 2019-10-25 | 2023-12-05 | 陕西汽车集团股份有限公司 | Air inlet system and noise reduction method of commercial vehicle |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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| EXPY | Termination of patent right or utility model |