CN103982281A - Active noise control system and method for automobile exhaust system - Google Patents
Active noise control system and method for automobile exhaust system Download PDFInfo
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- CN103982281A CN103982281A CN201410239184.7A CN201410239184A CN103982281A CN 103982281 A CN103982281 A CN 103982281A CN 201410239184 A CN201410239184 A CN 201410239184A CN 103982281 A CN103982281 A CN 103982281A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention relates to an active noise control system for an automobile exhaust system. The active noise control system comprises an exhaust pipe connected to an engine of an automobile, a three-way catalyst connected between the engine and a tail pipe of the exhaust pipe and a control system connected with the engine and the tail pipe respectively. The active noise control system further comprises an active muffler connected between the three-way catalyst and the tail pipe. The active muffler is provided with a vibration plate. A control signal output by the control system is transmitted to the active muffler and is used for controlling vibration of the vibration plate and generating reverse sound to eliminate medium-frequency and low-frequency noise. According to the active noise control system, the reverse sound is generated through vibration of the vibration plate in the active muffler, the problem that a loudspeaker of a traditional active muffler is poor in reliability and durability is solved, the muffling size and the weight of the exhaust system are further reduced, and combustion efficiency of the automobile is improved.
Description
Technical field
The invention belongs to field of acoustics, relate to a kind of active noise controlling system and controlling method thereof for automobile exhaust system.
Background technique
In Vehicle Driving Cycle process, the work cycle (particularly suck and compressed fuel-air mixture, light/expand and discharge the fuel-air mixture of burning) recurring due to internal-combustion engine has generated noise.These noises on the one hand as solid-borne sound by internal-combustion engine and emit to the outside of internal-combustion engine as airborne sound.On the other hand, noise is discharged by the vent systems of internal-combustion engine together with the fuel-air mixture of airborne sound and burning.
It is disadvantageous that these noises are usually considered to.As solid-borne sound, by the noise of internal-combustion engine, can using high efficiency decay and therefore conventionally do not form the problem of controlling as noise.But the silencing apparatus that need to arrange before vent systems entrance as airborne sound reduces.At present, conventional muffler, by its noise elimination mechanism, can be divided into dissipative muffler, reactive muffler and impedance muffler etc.The noise-cancelling theory of dissipative muffler is the sound-absorbing material utilizing in pipeline, partly absorbs the acoustic energy along pipe transmmision.Reactive muffler is to utilize the pipeline of various shapes, size and perforated pipe resonance sound-absorbing structure etc., causes sound wave in system middle impedance mismatch, makes sound wave in pipeline and resonant cavity, come back reflective, consume, thereby reaches the object of noise elimination.Impedance muffler is that dissipative muffler and reactive muffler are combined, thereby realizes the object that wideband is eliminated the noise.These silencing apparatuss have such shortcoming at present: the in the situation that of the high extinction efficiency of needs, they need a larger volume and apply relatively high resistance to the fuel-air mixture burning.The combustion efficiency and the fuel consumption that have reduced vehicle increase.
As an alternative or supplementary silencing apparatus, so-called active noise controlling system (as shown in Figure 1) has developed one period of time, the airborne sound that its anti-sound that electroacoustics is generated (but with the noise of cancellation being had to same-amplitude having the opposite phase sound wave of (oppositely)) is added to and is generated by internal-combustion engine and conduct in vent systems.
Accompanying drawing 1 is the Block Diagram of active noise controlling system of the prior art, the tail pipe 1 that comprises loudspeaker 3, is connected to the outlet pipe 4 on internal-combustion engine 6 and is all connected with outlet pipe 4 with the housing of loudspeaker 3, one end of tail pipe 1 has 2 connection mouths, 2 connection mouths are connected with the housing of loudspeaker 3 with the air outlet end of outlet pipe 4 respectively, the other end of tail pipe 1 has a mouth 2 so that the waste gas of conduction in outlet pipe 4 is discharged into outside, between outlet pipe 4 and internal-combustion engine 6, is also connected with catalytic converter 7.This active noise controlling also comprises engine control 8 and the anti-acoustic control system 10 for controlling combustion engine 6 work being electrically connected to internal-combustion engine 6, anti-acoustic control system 10 is unitarily formed with engine control 8, and be therefore integrated in engine control 8, anti-acoustic control system 10 is connected with loudspeaker 3, between loudspeaker 3 and anti-acoustic control system 10, is connected with amplifier 11.In tail pipe 1, be provided with error microphone 5, error microphone 5 is electrically connected to anti-acoustic control system 10, is provided for determining the temperature probe 9 of exhaust gas temperature in outlet pipe 4, and temperature probe 9 is connected in anti-acoustic control system 10.
As an alternative or the supplementary silencing apparatus by employing active noise controlling system, the structural volume of vent systems can be reduced to 60%, and weight can reduce to 40%, and exhaust back pressure can be reduced to 150 millibars (mbar).But due to problems such as vent systems internal high temperature and susceptibility-to-corrosions, the reliable durable of loudspeaker is difficult to be resolved.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiencies in the prior art, and a kind of active noise controlling system for automobile exhaust system is provided.
The present invention also provides a kind of controlling method of the active noise controlling system for automobile exhaust system
For solving above technical problem, the present invention adopts following technological scheme:
A kind of active noise controlling system for automobile exhaust system, comprise the outlet pipe on the motor that is connected to described automobile, the control system that is connected to the ternary catalyzing unit between described motor and the tail pipe of described outlet pipe and is electrically connected to described motor, described active noise controlling system also comprises the active silencer being connected between described ternary catalyzing unit and described tail pipe, described active silencer has vibrating plate, the control signal of described control system output transfers to described active silencer and eliminates Middle and low frequency noise for controlling the anti-sound of generation of vibration of described vibrating plate, described Middle and low frequency noise is that frequency is at the noise of 0～1000Hz.
Described active silencer comprises housing, described vibrating plate is fixedly installed in described housing and described housing is separated into the first chamber and the second chamber, described active silencer also comprises and is arranged on described vibrating plate and the piezoelectric chip being connected with described control system, the control signal that described piezoelectric chip is exported by described control system is controlled and is produced vibration, and the radiated noise that the vibration of described piezoelectric chip drives described vibration plate vibrates to produce corresponding frequencies and phase place is eliminated described Middle and low frequency noise.
Described active silencer also comprises suction tude and the steam outlet pipe that is fixedly installed on described housing two ends, one end of described suction tude is positioned at outside described housing and is connected with described outlet pipe, and the other end of described suction tude is through straight-through described the second chamber of described the first chamber; One end of described steam outlet pipe is positioned at outside described housing and is connected with described tail pipe, and the other end of described steam outlet pipe is connected on described housing and with described the second chamber and is communicated with.
Described active silencer also comprises the filter screen being fixedly installed in described the second chamber, and described filter screen is for filtering the particle of tail exhaust body, and the other end of described suction tude is through described filter screen.
On described vibrating plate, along the circumferencial direction of described vibrating plate, evenly arrange and offer a plurality of air holes for the first chamber described in balance and described the second chamber pressure, described the first chamber and described the second chamber are only connected by described air hole.
Described control system comprises the control unit that is electrically connected to described motor, be electrically connected to described control unit and can be arranged in the error microphone of described active silencer rear end and be connected to described control unit and described active silencer between frequency variator, described frequency variator is electrically connected to described control unit and described piezoelectric chip respectively, described frequency variator receives the control signal of described control unit output, and the radiated noise that then drives described vibration plate vibrates to produce corresponding frequencies and phase place for controlling the vibration of described piezoelectric chip is eliminated described Middle and low frequency noise; Described error microphone and guides control signal described in described control unit correction for the soundproof effect of active silencer described in Real-time Feedback;
Wherein, in described control unit, store indicatrix, the parametric variable of the working state of the data based described motor of described indicatrix carries out real vehicle test and determines; Thereby described control unit determines that by the signal receiving from described error microphone and threshold values comparison whether the indicatrix of selection is suitable for each temperature of the waste gas that conducts in described vent systems, changes described indicatrix or according to real-time result of calculation, described control signal is revised when exceeding described threshold values.
Described control unit comprises control chip, processor and the storage integrating, and described control chip produces the anti-acoustic signal of corresponding frequencies and phase place for frequency variator described in the feedback signal of feeding back according to described error microphone or the described engine behavior SC sigmal control of feeding back by described motor; Described processor is used for processing in real time the primary signal of described error microphone or described motor feedback, and result of calculation is fed back to described control chip; Described storage is tested the original occurrence characteristics curve recording or is stored the real-time control data that described processor calculates for storing, described control system also comprises storage battery, described storage battery is for to the power supply of described control unit, and described storage battery is also used to piezoelectric chip vibration described in described transducer drive that power is provided.
The temperature information of the described motor that described control unit detects can characterize near the state of temperature described active silencer indirectly, and described temperature information comprises at least one output signal of the cooling water temperature, oil temperature or the lambda probe that receive from described motor.
Between described ternary catalyzing unit and described active silencer, be also provided with dissipative muffler, described dissipative muffler is for passive elimination high frequency noise, and described high frequency noise is the noise of frequency more than 1000Hz.
A controlling method for above-mentioned active noise controlling system, described controlling method comprises the following steps:
Described control unit receives from described motor the running state that Operational Limits is determined described automobile, described Operational Limits comprises rotating speed, the temperature information of air inflow, oil consumption, described motor, wherein, described temperature information comprises at least one output signal of the cooling water temperature, oil temperature or the lambda probe that receive from described motor;
From described control unit, call suitable indicatrix;
Described control unit receives signal from described error microphone, thereby the signal of described error microphone output and threshold values are compared to each the temperature whether described indicatrix of determining selection is suitable for the waste gas that conducts in described vent systems, when exceeding described threshold values, change described indicatrix or according to real-time result of calculation, described control signal revised;
Described frequency variator receives described control signal for controlling the vibration of the described piezoelectric chip of described active silencer, and the radiated noise that the vibration of described piezoelectric chip drives described vibration plate vibrates to produce corresponding frequencies and phase place is eliminated described Middle and low frequency noise.
Due to the enforcement of technique scheme, the present invention compared with prior art tool has the following advantages:
Active noise controlling system of the present invention adopts the anti-sound of generation of vibration of vibrating plate, has not only solved the reliable durable problem of loudspeaker of the prior art, can further reduce noise elimination volume and the weight of vent systems simultaneously, improves the combustion efficiency of vehicle.
The control unit of controlling method of the present invention is simply selected suitable indicatrix by receiving engine operating parameter, then the signal feeding back by error pick-up carrys out the control signal of Correction and Control unit output, control signal and then control vibrating plate produce anti-sound and eliminate Middle and low frequency noise, and controlling method is simple.
Accompanying drawing explanation
Fig. 1 is the skeleton diagram of active noise controlling system of the prior art;
Fig. 2 is the skeleton diagram of active noise controlling system of the present invention;
Fig. 3 is the structural representation of the active silencer of active noise controlling system of the present invention;
In Fig. 2 ~ 3, the represented name of numeral is called:
1, motor; 2, ternary catalyzing unit; 3, dissipative muffler; 4, outlet pipe; 5, active silencer; 6, tail pipe; 7, error microphone; 8, frequency variator; 9, control unit; 10, control chip; 11, processor; 12, storage; 13, storage battery; 14, suction tude; 15, housing; 16, steam outlet pipe; 17, vibrating plate; 18, piezoelectric chip; 19, air hole; 20, filter screen; 21, the first chamber; 22, the second chamber.
Embodiment
Below in conjunction with Figure of description, the invention will be further described.
As shown in Fig. 2 ~ 3, a kind of active noise controlling system for automobile exhaust system, comprise the outlet pipe 4 on the motor 1 that is connected to automobile, be connected to the ternary catalyzing unit 2 between motor 1 and the tail pipe 6 of outlet pipe 4, the control system being electrically connected to motor 1, be connected to the active silencer 5 between ternary catalyzing unit 2 and tail pipe 6, active silencer 5 has vibrating plate 17, the control signal of control system output transfers to active silencer 5 and eliminates Middle and low frequency noise for controlling the anti-sound of generation of vibration of vibrating plate 17, Middle and low frequency noise is that frequency is at the noise of 0～1000Hz.This active noise controlling system also comprises the dissipative muffler 3 being arranged between ternary catalyzing unit 2 and active silencer 5, and dissipative muffler 3 is the noise of frequency more than 1000Hz for passive elimination high frequency noise high frequency noise.
As shown in Figure 3, active silencer 5 comprises housing 15, vibrating plate 17 is fixedly installed in housing 15 and housing 15 is separated into the first chamber 21 and the second chamber 22, active silencer 5 also comprises the piezoelectric chip 18 that is arranged on vibrating plate 17 and is connected with control system, piezoelectric chip 18 is provided with a plurality of, a plurality of piezoelectric chips 18 are evenly arranged along vibrating plate 17 circumferencial directions, the control signal that piezoelectric chip 18 is exported by control system is controlled and is produced vibration, and the radiated noise that the vibration of piezoelectric chip 18 drives vibrating plate 17 to produce corresponding frequencies and phase place is eliminated Middle and low frequency noise.
In the present embodiment, active silencer also comprises suction tude 14 and the steam outlet pipe 16 that is fixedly installed housing two ends, and one end of suction tude 14 is positioned at outside housing 15 and is connected with outlet pipe 4, and the other end of suction tude 14 is through straight-through the second chamber 22 of the first chamber 21; One end of steam outlet pipe 16 is positioned at outside housing 15 and is connected with tail pipe 6, and the other end of steam outlet pipe 16 is connected on housing 15 and with the second chamber 22 and is communicated with.This active silencer 5 also comprises the filter screen 20 being fixedly installed in the second chamber 22, and filter screen 20 is for the particle that filters tail exhaust body to prevent particle erosion piezoelectric chip 18 and vibrating plate 17, and the other end of suction tude 14 is through filter screen 20.
For the air pressure of balance the first chamber 21 and the second chamber 22, on vibrating plate 17, along the circumferencial direction of vibrating plate 17, evenly arrange and offer a plurality of air hole 19, the first chambers 21 and 22 of the second chambers are connected by air hole 19.
Control system in the present embodiment comprises the control unit 9 that is electrically connected to motor 1, be electrically connected to control unit 9 and can be arranged in the error microphone 7 of active silencer 5 rear ends and be connected to control unit 9 and active silencer 5 between frequency variator 8, frequency variator 8 is electrically connected to control unit 9 and piezoelectric chip 18 respectively, the control signal of frequency variator 8 reception control unit 9 outputs, then drives the radiated noise of vibrating plate 17 generation of vibration corresponding frequencies and phase place to eliminate Middle and low frequency noise for controlling the vibration of piezoelectric chip 18; Error microphone 7 and guides control unit 9 Correction and Control signals for the soundproof effect of Real-time Feedback active silencer 5.
Wherein, in control unit 9, store indicatrix, the parametric variable of the working state of the data based motor 1 of indicatrix carries out real vehicle test and determines; Thereby control unit 9 is determined the signal receiving from error microphone 7 and threshold values comparison each temperature of the waste gas whether indicatrix of selection is suitable for conducting in vent systems, changes indicatrix or according to real-time result of calculation, control signal is revised when exceeding threshold values.
Control unit in the present embodiment comprises control chip 10, processor 11 and the storage 12 integrating, and control chip 10 controls for the feedback signal of feeding back according to error microphone 7 or motor 1 working state signal feeding back by motor 1 the anti-acoustic signal that frequency variator 8 produces corresponding frequencies and phase place; Processor 11 is for the real-time primary signal of process errors microphone 7 or motor 1 feedback, and result of calculation is fed back to control chip 10; The real-time control data that storage 12 calculates for storing the original occurrence characteristics curve that records of experiment or storage of processor 11, control system also comprises storage battery 13, storage battery 13 is for giving control unit 9 power supplies, and storage battery 13 is also used to frequency variator 8 to drive piezoelectric chip 18 vibrations that power is provided.
The temperature information of the motor 1 that the control unit 9 of the present embodiment detects can characterize near state of temperature active silencer 5 indirectly, so just can be separately again mounting temperature sensor test, this temperature information comprises at least one output signal of the cooling water temperature, oil temperature or the lambda probe that receive from motor 1.
The controlling method of above-mentioned active noise controlling system, step is as follows:
Control unit 9 receives from motor 1 running state that Operational Limits is determined automobile, Operational Limits comprises air inflow, oil mass, the rotating speed of motor 1, temperature information, wherein, temperature information comprises at least one output signal of the cooling water temperature, oil temperature or the lambda probe that receive from motor 1;
From control unit 9, call suitable indicatrix;
Control unit 9 receives signal from error microphone 7, thereby each temperature that the signal of error microphone 7 output and threshold values is compared to the waste gas of determining whether the indicatrix of selection is suitable for conducting in vent systems changes indicatrix or according to real-time result of calculation, control signal is revised when exceeding threshold values;
Frequency variator 8 reception control signals are for controlling the vibration of the piezoelectric chip 18 of active silencer 5, and the vibration of piezoelectric chip 18 drives the radiated noise of vibrating plate 17 generation of vibration corresponding frequencies and phase place to eliminate Middle and low frequency noise.
Above the present invention is described in detail; its object is to allow the personage who is familiar with this art can understand content of the present invention and be implemented; can not limit the scope of the invention with this; the equivalence that all Spirit Essences according to the present invention are done changes or modifies, and all should be encompassed in protection scope of the present invention.
Claims (10)
1. the active noise controlling system for automobile exhaust system, comprise the outlet pipe on the motor that is connected to described automobile, the control system that is connected to the ternary catalyzing unit between described motor and the tail pipe of described outlet pipe and is electrically connected to described motor, it is characterized in that, described active noise controlling system also comprises the active silencer being connected between described ternary catalyzing unit and described tail pipe, described active silencer has vibrating plate, the control signal of described control system output transfers to described active silencer and eliminates Middle and low frequency noise for controlling the anti-sound of generation of vibration of described vibrating plate, described Middle and low frequency noise is that frequency is at the noise of 0～1000Hz.
2. active noise controlling system according to claim 1, it is characterized in that, described active silencer comprises housing, described vibrating plate is fixedly installed in described housing and described housing is separated into the first chamber and the second chamber, described active silencer also comprises and is arranged on described vibrating plate and the piezoelectric chip being connected with described control system, the control signal that described piezoelectric chip is exported by described control system is controlled and is produced vibration, the radiated noise that the vibration of described piezoelectric chip drives described vibration plate vibrates to produce corresponding frequencies and phase place is eliminated described Middle and low frequency noise.
3. active noise controlling system according to claim 2, it is characterized in that, described active silencer also comprises suction tude and the steam outlet pipe that is fixedly installed on described housing two ends, one end of described suction tude is positioned at outside described housing and is connected with described outlet pipe, and the other end of described suction tude is through straight-through described the second chamber of described the first chamber; One end of described steam outlet pipe is positioned at outside described housing and is connected with described tail pipe, and the other end of described steam outlet pipe is connected on described housing and with described the second chamber and is communicated with.
4. active noise controlling system according to claim 3, it is characterized in that, described active silencer also comprises the filter screen being fixedly installed in described the second chamber, and described filter screen is for filtering the particle of tail exhaust body, and the other end of described suction tude is through described filter screen.
5. active noise controlling system according to claim 2, it is characterized in that, on described vibrating plate, along the circumferencial direction of described vibrating plate, evenly arrange and offer a plurality of air holes for the first chamber described in balance and described the second chamber pressure, described the first chamber and described the second chamber are only connected by described air hole.
6. active noise controlling system according to claim 2, it is characterized in that, described control system comprises the control unit being electrically connected to described motor, be electrically connected to described control unit and can be arranged in the error microphone of described active silencer rear end and be connected to described control unit and described active silencer between frequency variator, described frequency variator is electrically connected to described control unit and described piezoelectric chip respectively, described frequency variator receives the control signal of described control unit output, then the radiated noise that drives described vibration plate vibrates to produce corresponding frequencies and phase place for controlling the vibration of described piezoelectric chip is eliminated described Middle and low frequency noise, described error microphone and guides control signal described in described control unit correction for the soundproof effect of active silencer described in Real-time Feedback,
Wherein, in described control unit, store indicatrix, the parametric variable of the working state of the data based described motor of described indicatrix carries out real vehicle test and determines; Thereby described control unit determines that by the signal receiving from described error microphone and threshold values comparison whether the indicatrix of selection is suitable for each temperature of the waste gas that conducts in described vent systems, changes described indicatrix or according to real-time result of calculation, described control signal is revised when exceeding described threshold values.
7. active noise controlling system according to claim 6, it is characterized in that, described control unit comprises control chip, processor and the storage integrating, and described control chip produces the anti-acoustic signal of corresponding frequencies and phase place for frequency variator described in the feedback signal of feeding back according to described error microphone or the described engine behavior SC sigmal control of feeding back by described motor; Described processor is used for processing in real time the primary signal of described error microphone or described motor feedback, and result of calculation is fed back to described control chip; Described storage is tested the original occurrence characteristics curve recording or is stored the real-time control data that described processor calculates for storing, described control system also comprises storage battery, described storage battery is for to the power supply of described control unit, and described storage battery is also used to piezoelectric chip vibration described in described transducer drive that power is provided.
8. active noise controlling system according to claim 6, it is characterized in that, the temperature information of the described motor that described control unit detects can characterize near the state of temperature described active silencer indirectly, and described temperature information comprises at least one output signal of the cooling water temperature, oil temperature or the lambda probe that receive from described motor.
9. active noise controlling system according to claim 1, it is characterized in that, between described ternary catalyzing unit and described active silencer, be also provided with dissipative muffler, described dissipative muffler is for passive elimination high frequency noise, and described high frequency noise is the noise of frequency more than 1000Hz.
10. the controlling method of the active noise controlling system as described in any one claim in claim 1 ~ 9, is characterized in that, described controlling method comprises the following steps:
Described control unit receives from described motor the running state that Operational Limits is determined described automobile, described Operational Limits comprises rotating speed, the temperature information of air inflow, oil consumption, described motor, wherein, described temperature information comprises at least one output signal of the cooling water temperature, oil temperature or the lambda probe that receive from described motor;
From described control unit, call suitable indicatrix;
Described control unit receives signal from described error microphone, thereby the signal of described error microphone output and threshold values are compared to each the temperature whether described indicatrix of determining selection is suitable for the waste gas that conducts in described vent systems, when exceeding described threshold values, change described indicatrix or according to real-time result of calculation, described control signal revised;
Described frequency variator receives described control signal for controlling the vibration of the described piezoelectric chip of described active silencer, and the radiated noise that the vibration of described piezoelectric chip drives described vibration plate vibrates to produce corresponding frequencies and phase place is eliminated described Middle and low frequency noise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410239184.7A CN103982281B (en) | 2014-05-30 | 2014-05-30 | A kind of active noise control system for automobile exhaust system and controlling method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410239184.7A CN103982281B (en) | 2014-05-30 | 2014-05-30 | A kind of active noise control system for automobile exhaust system and controlling method thereof |
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| CN103982281A true CN103982281A (en) | 2014-08-13 |
| CN103982281B CN103982281B (en) | 2016-04-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108301895A (en) * | 2017-12-25 | 2018-07-20 | 重庆达德机械制造有限公司 | A kind of elimination noise automobile exhaust pipe |
| CN109141519A (en) * | 2018-07-11 | 2019-01-04 | 同济大学 | A kind of testboard bay tested for silencer element acoustics and flow field characteristic |
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| CN1333419A (en) * | 2000-07-07 | 2002-01-30 | 鹿廷亮 | Computer controlled silencer |
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| US20130056083A1 (en) * | 2007-03-29 | 2013-03-07 | Faurecia Emissions Control Technologies | Hybrid valve for attenuation of low frequency noise |
| CN203867673U (en) * | 2014-05-30 | 2014-10-08 | 清华大学苏州汽车研究院（相城） | Active noise control system used for automobile exhaust system |
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|---|---|---|---|---|
| JPS5618014A (en) * | 1979-07-19 | 1981-02-20 | Makoto Nandate | Exhaust silencer for internal combustion engine |
| EP0164324B1 (en) * | 1984-05-07 | 1990-08-08 | Atlas Copco Aktiebolag | Vibration insulating handle |
| CN1333419A (en) * | 2000-07-07 | 2002-01-30 | 鹿廷亮 | Computer controlled silencer |
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| US20130056083A1 (en) * | 2007-03-29 | 2013-03-07 | Faurecia Emissions Control Technologies | Hybrid valve for attenuation of low frequency noise |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108301895A (en) * | 2017-12-25 | 2018-07-20 | 重庆达德机械制造有限公司 | A kind of elimination noise automobile exhaust pipe |
| CN108301895B (en) * | 2017-12-25 | 2020-12-22 | 重庆近江智信汽车零部件有限公司 | Noise-eliminating automobile exhaust pipe |
| CN109141519A (en) * | 2018-07-11 | 2019-01-04 | 同济大学 | A kind of testboard bay tested for silencer element acoustics and flow field characteristic |
| CN109141519B (en) * | 2018-07-11 | 2021-09-03 | 同济大学 | Test bench for testing acoustic and flow field characteristics of silencing element |
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| Publication number | Publication date |
|---|---|
| CN103982281B (en) | 2016-04-27 |
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