JPS58214614A - Silencer for exhaust sound of engine - Google Patents

Silencer for exhaust sound of engine

Info

Publication number
JPS58214614A
JPS58214614A JP9623982A JP9623982A JPS58214614A JP S58214614 A JPS58214614 A JP S58214614A JP 9623982 A JP9623982 A JP 9623982A JP 9623982 A JP9623982 A JP 9623982A JP S58214614 A JPS58214614 A JP S58214614A
Authority
JP
Japan
Prior art keywords
sound
exhaust
engine
bellows
silencer
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.)
Granted
Application number
JP9623982A
Other languages
Japanese (ja)
Other versions
JPH0377370B2 (en
Inventor
Motohiro Inaba
稲葉 元宏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP9623982A priority Critical patent/JPS58214614A/en
Publication of JPS58214614A publication Critical patent/JPS58214614A/en
Publication of JPH0377370B2 publication Critical patent/JPH0377370B2/ja
Granted legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00Silencing apparatus characterised by method of silencing
    • F01N1/16Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/22Silencing apparatus characterised by method of silencing by using movable parts the parts being resilient walls

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Abstract

PURPOSE:To eliminte noises generated to the outside of a car and filled in the car by vibrating a vibrating plate to generate sound having opposite site phase to that of pulsating sound of exhaust for silencing so that sound from extremely low frequency i.e. low order component of the rotational speed of an engine can be silenced. CONSTITUTION:In a portion 4a of an exhaust silencer 4 is generated sound having the same frequency and amplitude as exhaust sound from an engine and phase deviated by half a wave length from the exhaust sound(sound of opposite phase) to be combined with th exhaust sound for silencing. A variabl volume type resonace chamber 11 is provided on the opposite side to an expansion chamber 8 to sandwich the other partition plate 10 between itself and said expansion chamber 8 and communicated thereto through a communicating pipe 12. A bellows 13 consisting of aluminized spring copper or the like is secured fixedly at one end of the partition plate 10 side. A concave vibtating plate 14 is mounted on the other end of the bellows 13 to close the bellows. A device for vibrating the vibrating plate 14 is constituted of a field system 15, a coil 16, bobbins 17, 18, etc.

Description

【発明の詳細な説明】 本発明はエンジンの排気消音装置に関する。[Detailed description of the invention] The present invention relates to an engine exhaust silencer.

従来の自動車用エンジンの排気消音器としては、例えば
第1図(興亡出版−発行「騒音対策と消音設計」参照)
に示すようなものがある。これについて説明すると、消
音器内は4つの室51〜54に仕切られている。排気は
排気入口管55がら室53に流入し、連通管56により
Uターンして室51に流入するようになっており、この
間において膨張、共鳴が起こり、消音される。即ち、室
53において連通管58と室54とで構成される音響振
動系(ヘルムホルツの共鳴器)により主に低周IJJt
(例えば200〜30011z)の消音がなされ、排気
入口管55及び連通管56においてそれらの多数の小孔
59と室52とで構成される多孔共鳴型消音要素により
主に中高周波(例えば1〜2Kl(z)の消音がなされ
る。勿論、消音される周波数は音速と各部の仕様によっ
て決定される。
An example of a conventional exhaust silencer for an automobile engine is shown in Figure 1 (see "Noise Countermeasures and Silence Design" published by Koro Publishing).
There is something like this. To explain this, the inside of the muffler is partitioned into four chambers 51 to 54. The exhaust gas flows into the chamber 53 through the exhaust inlet pipe 55, makes a U-turn through the communication pipe 56, and flows into the chamber 51. During this time, expansion and resonance occur, and the sound is muffled. That is, in the chamber 53, the acoustic vibration system (Helmholtz resonator) composed of the communication pipe 58 and the chamber 54 mainly generates low frequency IJJt.
(for example, 200 to 30,011 (z) is muted.Of course, the frequency to be muted is determined by the speed of sound and the specifications of each part.

しかしながら、このような従来の排気消音器にあっては
、消音量の増大及び低周波音の消音を図るために消音器
の容量の増量及び長さの拡大が必要であり、消音器を車
両フロア下に納める都合上、これらの性能に限界があっ
た。このため、エンジン回転速度の低次成分である極低
周波数(20〜20011z)の消音効果は微弱であり
、消音されずに出てくる排気吐出音すなわち排気脈動音
により、車外騒音を悪化させたり、これが車内のこもり
音の原因になるという問題点があった。
However, with such conventional exhaust silencers, it is necessary to increase the capacity and length of the silencer in order to increase the amount of noise reduction and muffle low-frequency sounds, and the silencer must be installed on the vehicle floor. There was a limit to their performance due to the fact that they could be stored below. For this reason, the muffling effect of extremely low frequencies (20 to 20011z), which are the low-order components of the engine speed, is weak, and the exhaust discharge sound that is not muffled, that is, the exhaust pulsation sound, may worsen the noise outside the vehicle. There was a problem in that this caused muffled noise inside the car.

本発明はこのような従来の問題点に着目し、極低周波数
からの消音を可能とすることを目的としてなされたもの
で、消合器内の拡張室又は共鳴室をべ1:1−ズ横j告
と1−111つその−11111を振動板とすると共に
、前記拡張室又番、1共鳴室に到達する排気脈動音と逆
位相のflを発!1さ・けるべく前記振動板を加振する
加振装置釘を設む」ることにより、排気脈動音をこれと
II逆位相の合で相殺し、もって消音するようにしたも
のである。
The present invention has focused on such conventional problems, and has been made with the aim of making it possible to muffle sounds from extremely low frequencies. By using the transverse vibration plate and the -11111 as a diaphragm, it emits fl that is in the opposite phase to the exhaust pulsation sound that reaches the expansion chamber and the 1 resonance chamber! By providing an excitation device that vibrates the diaphragm as much as possible, the exhaust pulsation noise is canceled out by the opposite phase of the exhaust pulsation sound, thereby muffling the noise.

以下、本発明を図面に基づいて説明する。Hereinafter, the present invention will be explained based on the drawings.

第2図〜第4図は本発明の一実施例を示している。2 to 4 show an embodiment of the present invention.

第2図を参照し、Iはエンジン本体、2は排気マニボー
ル1′、3はυ1気簀、4はJJI気消音器、5はテー
ルチューブである。ここで、排気消音器4はその一部4
aが第3図に示す如く構成される。
Referring to FIG. 2, I is the engine body, 2 is the exhaust manifold 1', 3 is the υ1 air filter, 4 is the JJI air silencer, and 5 is the tail tube. Here, the exhaust silencer 4 is a part of the exhaust silencer 4.
a is constructed as shown in FIG.

第3図を参照し、(i 4よ1jl気人1−1g、7ば
排気出ITI管、8番、1仕切扱9.In間に形成され
たUターン型の拡張室で、−・方の(l: lJl板9
に排気人口管6及び1〕1気出「1管7がIII((・
1目られ′Cそれぞれ開口している。11は容積可変型
の共鳴室で、他方の仕切板10を挾んで拡張室13と(
,1反対側に設VJられ、連通管12を介して拡張室E
3と連通している。ここで、排気は排気入口管6から拡
張室8を経て排気出口管7へ流れ、共鳴室11には排気
音のみ到達し、排気は流れない。
Referring to Figure 3, (i 4, 1jl, 1-1g, 7, exhaust outlet ITI pipe, 8, 1 partition, 9. In the U-turn type expansion chamber formed between -. (l: lJl board 9
Exhaust manifold 6 and 1] 1 exhaust pipe 7 is III ((・
Each of the first and second eyes 'C' is open. Reference numeral 11 denotes a variable volume resonance chamber, which is separated from the expansion chamber 13 by sandwiching the other partition plate 10.
, 1 is installed on the opposite side, and the expansion chamber E is connected via the communication pipe 12.
It communicates with 3. Here, the exhaust gas flows from the exhaust inlet pipe 6 through the expansion chamber 8 to the exhaust outlet pipe 7, and only the exhaust sound reaches the resonance chamber 11, and no exhaust gas flows.

13はアルミナイズドしたばね銅又は耐食性の高い銅糸
のばね材料(ヘリリウム系銅合金等)からなるベローズ
で、仕切板10側の一端が固定されている。14は凹面
状の振動板で、ベローズ13の(tb 61idにこれ
を閉塞するように取付けられている。ここで、仕切板1
0とへローズ13と振動板14とにより前記共鳴室11
を形成している。
A bellows 13 is made of aluminized spring copper or a highly corrosion-resistant copper thread spring material (helium-based copper alloy, etc.), and one end on the partition plate 10 side is fixed. Reference numeral 14 denotes a concave diaphragm, which is attached to the bellows 13 (tb 61id) so as to close it.
The resonance chamber 11 is
is formed.

15は界磁(永久磁石)、16はコイル、17.18は
コイル16と一体動する金属製のボビン(但し17はア
ルミ等の非磁性体)、19はボビン17.18を全周か
ら支持する金属製のダイアフラムで、コイル16が正規
の振動方向と直角方向に動くのを規制する。
15 is a field (permanent magnet), 16 is a coil, 17.18 is a metal bobbin that moves together with the coil 16 (however, 17 is a non-magnetic material such as aluminum), and 19 supports the bobbin 17.18 from the entire circumference. A metal diaphragm restricts the coil 16 from moving in a direction perpendicular to the normal vibration direction.

ここで、ボビン18を振動板14に固定することにより
、界磁】5、nイル托、ボビン17.18等で振動板1
4の加振装置を構成している。
Here, by fixing the bobbin 18 to the diaphragm 14, the diaphragm 1 is fixed with a field of
4 vibration excitation devices are constructed.

20はベローズ13等を保護密閉するケーシングで、ダ
イアフラム19と!/l!&(IFi固定用ゾラケソト
21とを支持している。22ば!/li &i I 5
等を保i!!&密閉するケーシングで、昇磁1JI体か
らなる。尚、前記振動板14及びボビン1))に目、そ
れぞれ小1’L 23 、24が設けられており、ケー
シング20により密閉されたl辰動扱14の背後の空気
が琲((/AAで温められても内圧が」二昇するのを防
+lLf!’)るようになっている。
20 is a casing that protects and seals the bellows 13, etc., and the diaphragm 19! /l! &(Supports the IFi fixing Zorakesoto 21.22ba!/li &i I 5
Keep etc! ! &A hermetically sealed casing, consisting of a magnetized 1JI body. Note that the diaphragm 14 and the bobbin 1) are provided with small holes 23 and 24, respectively, so that the air behind the radial movement handle 14, which is sealed by the casing 20, is It is designed to prevent the internal pressure from rising even when heated.

前記加振装置のコイル16への16勺は第4図に示す信
号発4日iiI WII 25により発生・1!シめら
れる。
16 to the coil 16 of the vibration device is generated by the signal shown in FIG. 4 iii WII 25. I can be shunned.

第4図を参照し、信号発生量v825は、エンジン回転
信号を基本人力信号とし、また吸入空気流量信号、エン
ジン吸入負圧1=号及び4A気温度信号を補助人力(6
月とし−(オンジ)、II−パスフィルタ26、波形整
形回路27、位相制御回IM21+、1辰’IVil制
御回路29、パワーアンプ30及びiM ’tAL分シ
フト回@31を含んで構成される。ここで、これらの入
力信号は第2図に示したエンジン回転センジ・32、吸
入空気流量センサ33、エンジン吸入負圧センサ(図示
せず)及び排気温度センサ34a 、34b、I、り入
力される。但し、排気温度信号は2つのセンJ34a 
、34hによって得られる排気温度の平均値に相当する
ものである。
Referring to FIG. 4, the signal generation amount v825 uses the engine rotation signal as the basic human power signal, and the intake air flow rate signal, engine intake negative pressure 1=, and 4A air temperature signal as the auxiliary human power signal (6
The circuit is configured to include a moon toshi-(onge), an II-pass filter 26, a waveform shaping circuit 27, a phase control circuit IM21+, a 1/'IVil control circuit 29, a power amplifier 30, and an iM'tAL shift circuit @31. Here, these input signals are inputted to the engine rotation sensor 32, intake air flow rate sensor 33, engine intake negative pressure sensor (not shown), and exhaust temperature sensors 34a, 34b, and I shown in FIG. . However, the exhaust temperature signal is generated by two sensors J34a.
, 34h.

次に作用を説明する。Next, the effect will be explained.

エンジンの排気弁が開弁することによって発生する排気
音は、排気マニホールド2から排気管3、排気消音器4
を通ってテールチューブ5より車外に放射される。本発
明の原理は、排気消音器4の一部4aにおいて、エンジ
ンから来る排気音と同一周波数、同一振幅で、反波長位
相のずれた音(逆位相の音)を発生させて、排気音と合
成させることにより、消音を行なうことにある。
Exhaust noise generated when the exhaust valve of the engine opens is transmitted from the exhaust manifold 2 to the exhaust pipe 3 to the exhaust silencer 4.
It passes through the tail tube 5 and is radiated to the outside of the vehicle. The principle of the present invention is to generate, in a part 4a of the exhaust silencer 4, a sound having the same frequency and the same amplitude as the exhaust sound coming from the engine, but with an anti-wavelength phase shift (opposite phase sound). The purpose is to mute the sound by compositing.

この原理を実現するため、エンジン回転、吸入空気流量
、エンジン吸入負圧、排気温度を検出し、これらに基づ
いて信号発生回路25により発生させた信号を加振装置
のコイル16に送出する。
In order to realize this principle, engine rotation, intake air flow rate, engine intake negative pressure, and exhaust temperature are detected, and a signal generated by the signal generation circuit 25 based on these is sent to the coil 16 of the vibration device.

信号発生回路25においては、排気脈動音の基本周波数
と同一周波数の第5図Bの如きエンジン回転信号(例え
ば4気筒エンジンでの第5図Aの如き排気弁のリフトの
タイミングをとらえた1回転に2パルスの信号)をロー
パスフィルタ26及び波形整形回路27により第5図C
の如き正弦波に整形する(周波数(−N/30 (ll
z)  ; Nは回転数)。
In the signal generation circuit 25, an engine rotation signal as shown in FIG. 5B having the same frequency as the fundamental frequency of the exhaust pulsation sound (for example, a one-rotation signal that captures the lift timing of the exhaust valve as shown in FIG. 5A in a 4-cylinder engine) is used. 2 pulse signal) is processed by the low-pass filter 26 and the waveform shaping circuit 27 as shown in Fig. 5C.
Shape into a sine wave like (frequency (-N/30 (ll
z); N is the number of rotations).

位相制御回路284J吸入空気流頂信号と排気温度信号
とを受け、これらの信号により換算される排気の流速に
基づいて1ノ1気音が1」1気の流れに乗って伝■する
際のドツプラ効果にまるみかげの音速の変化に対応し、
前記正弦波をIJ+気消音器4の共鳴室11に到達する
消音すべきIJILA音と同一周波数にする。
The phase control circuit 284J receives the intake air flow top signal and the exhaust temperature signal, and calculates the rate at which each air sound is transmitted along the air flow based on the exhaust flow velocity converted from these signals. Corresponding to the change in the sound speed of the Dotsupura effect,
The sine wave is made to have the same frequency as the IJILA sound that reaches the resonance chamber 11 of the IJ+air silencer 4 and is to be silenced.

そして、位相制御回路21(ば、第5図りの如く排気弁
で発生したtJl気音がIJI気消音器4の共鳴室11
に到達するまでの時間遅れ△tを見込んで、到達時の排
気音の位相と逆位相の正弦波になるよう位相を制御する
。ここで、前記時間遅れ△tは排気温度から一義的にi
!tられる音速に基づいて決定さ   ゛れるので、位
相制御回1/8211に口排気温度信号が入力される。
Then, the phase control circuit 21 (as shown in the fifth diagram), the tJl air sound generated in the exhaust valve is transferred to the resonance chamber 11 of the IJI air silencer 4.
Taking into consideration the time delay Δt until reaching the exhaust sound, the phase is controlled so that it becomes a sine wave with a phase opposite to that of the exhaust sound at the time of arrival. Here, the time delay Δt is uniquely i from the exhaust temperature
! Since it is determined based on the sound velocity determined by t, the mouth exhaust temperature signal is input to the phase control circuit 1/8211.

また、IJ1気管31.1りl気にさらされているので
、排気マニボール1゛2と(〕1気消音器4直前の排気
管3とにυ1気温度レンジ・34a 、34bを取付け
ることによって、ill均的なυ1気温度を検出してい
る。
In addition, since the IJ1 trachea 31.1 is exposed to air, by attaching the υ1 air temperature range 34a, 34b to the exhaust manifold 12 and the exhaust pipe 3 just before the 1 air silencer 4, It detects uniform υ1 air temperature.

ここで、時間遅れ△tは以下のようにして求める。Here, the time delay Δt is determined as follows.

△t −1−/ C(sec 〕       (1)
式但し、Lは排気ボートから本消音器までの距離(m)
  Cはみかけの音速Cm/5ec)I7は定数だが、
みかけの音速Cは排気温度T。
△t -1-/C (sec) (1)
However, L is the distance (m) from the exhaust boat to the main silencer.
C is the apparent speed of sound Cm/5ec) I7 is a constant,
The apparent speed of sound C is the exhaust temperature T.

排気流速■によって次のように変化する。It changes as follows depending on the exhaust flow velocity ■.

音速Cの設定はいわゆるドラツブ効果のため、C= C
11+V  (m/sec )     (21式但し
、Coは流れのないときの音速(m/5ec)Vは排気
流速 となり、Co及びVは更“に次の式で表せる。
The setting of the sound speed C is due to the so-called drab effect, so C=C
11+V (m/sec) (Formula 21, where Co is the sound velocity when there is no flow (m/5ec), V is the exhaust flow velocity, and Co and V can be further expressed by the following equation.

但し、T〔℃〕は排気温度  Kは比熱比。However, T [°C] is the exhaust temperature, and K is the specific heat ratio.

gは重力加速度  Rは気体定数 であり、K、g+  Rは一定なので音速Coは温度に
よって変化する。
g is the gravitational acceleration, R is a gas constant, and since K and g+R are constant, the speed of sound Co changes depending on the temperature.

v−(Vo/S)  ・ (T+273)/ (To 
+273)(4)式 但し、V o  (m3/ ser、〕は吸入空気流量
S[n+)は排気管断面4Jj   ’T”o(’C)
は吸入空気温度  T(’C)は1ノ1気温度となり、
S、Toは一定なのでυ1気流速■は吸入空気量Voと
排気温度Tより求まる。
v-(Vo/S) ・(T+273)/(To
+273) Equation (4) However, V o (m3/ser, ) is the intake air flow rate S[n+) is the exhaust pipe cross section 4Jj 'T”o ('C)
is the intake air temperature, T('C) is the 1 no 1 air temperature,
Since S and To are constant, υ1 air velocity ■ can be found from the intake air amount Vo and the exhaust temperature T.

従って、信号発生回路25の中に、」−の式をマイコン
等を利用してプログラムしておりば、運転中の必要な△
tを直らに設定することができる。
Therefore, if the formula ``-'' is programmed into the signal generation circuit 25 using a microcomputer, etc., the necessary △
t can be set directly.

そして、振幅制御回路29は第5図Eに示すように、消
音ずべきIJI気音の音圧振l■と同じ音圧を発生せし
めるべく、iU4の振幅を変化させる。ここで、排気音
の大きさG:1エンジンの負荷によって変化するので、
負荷をエンジン吸入負圧によって検出し、エンジン吸入
負圧fd附を振幅制御回路29に入力している。
Then, as shown in FIG. 5E, the amplitude control circuit 29 changes the amplitude of iU4 in order to generate the same sound pressure as the sound pressure amplitude l■ of the IJI sound that should be muted. Here, the magnitude of the exhaust noise G:1 changes depending on the engine load, so
The load is detected by the engine suction negative pressure, and the engine suction negative pressure fd is input to the amplitude control circuit 29.

そして、パワーアンプ30は、以上のように補正された
16月が加1辰装置を駆動できる電力を持つように増幅
して出力する。
Then, the power amplifier 30 amplifies and outputs the corrected power as described above so that it has enough power to drive the power supply device.

信号発生回路25からのfd附はコイル16に入力され
、界磁15との関係でコ・イルI6が前後に振動するこ
とにより、ボビン17.18を介して振動板14を振動
させ、前記信号の特性に基づいて排気音と同一周波数、
同一振幅で逆位相の音を共鳴室11内に発生させる。
The fd signal from the signal generation circuit 25 is input to the coil 16, and the coil I6 vibrates back and forth in relation to the field 15, vibrating the diaphragm 14 via the bobbin 17, 18, and generating the signal. The same frequency as the exhaust sound, based on the characteristics of
Sounds with the same amplitude and opposite phase are generated in the resonance chamber 11.

これにより、排気音(第5図G)と、これと逆位相の音
とが打消し合うこととなり、排気音を消滅させることが
できる(第5図H)。
As a result, the exhaust sound (FIG. 5G) and the sound with the opposite phase cancel each other out, making it possible to eliminate the exhaust sound (FIG. 5H).

尚、共鳴室11には排気が直接には流れないため、温度
は低く抑えられるので、ケーシング20でベローズ13
等を密閉しても何ら耐久性に問題はない。
Incidentally, since the exhaust gas does not directly flow into the resonance chamber 11, the temperature can be kept low, so the bellows 13 is connected to the casing 20.
Even if it is sealed, there is no problem with durability.

また、この例で振動板14を凹面形状としたのは軽量で
且つ曲げ剛性を高めるためであるが、ハニカムサンドイ
ンチ板等でも可能である。
Further, in this example, the diaphragm 14 has a concave shape in order to be lightweight and increase bending rigidity, but a honeycomb sandwich plate or the like may also be used.

次に、第4図中の直流分シフト回路31について説明す
る。
Next, the DC component shift circuit 31 in FIG. 4 will be explained.

共鳴室11の容積と連通管I2の寸法は消音したい周波
数にチューニングされているが、排気消音器の一部に組
込まれた共鳴室11のチューニング周波数は一般に20
0〜400 Hzと比較的高く、また、このチューニン
グ周波数は、排気中の音速すなわち排気温度によって遷
移しくしまい、高温になれば周波数が高くなる。
The volume of the resonance chamber 11 and the dimensions of the communication pipe I2 are tuned to the desired frequency for noise reduction, but the tuning frequency of the resonance chamber 11 incorporated in a part of the exhaust silencer is generally 20.
The tuning frequency is relatively high, from 0 to 400 Hz, and this tuning frequency varies depending on the speed of sound in the exhaust gas, that is, the temperature of the exhaust gas, and the higher the temperature, the higher the frequency becomes.

即ち、共鳴型消音器のチュ−ニング周波数はf n −
C/ 2πF[γ心/T凸  (5)式但し、S;首部
断面積  l:首都圏さ■;容偵 であり、音速Cは前記の63)式のごとく変化する。
That is, the tuning frequency of the resonant silencer is f n -
C/ 2πF [γ center/T convex Equation (5) where S: neck cross-sectional area l: metropolitan area; sound speed C changes as shown in Equation 63) above.

(5)式を代入して■に一つい°(IWりと、V  −
(K  ・ 1【 ・ l−ン ・ S)  ・  (
T  I−273)  /  (2π・f)Lfai1
式 となり、温度の−1−、、Wと共に容積■が1輪加する
にようにシフ1させれば良い。
Substituting equation (5) into ■, one degree (IWritto, V −
(K ・ 1 [ ・ l-n ・ S) ・ (
T I-273) / (2π・f)Lfai1
The following equation is obtained, and it is sufficient to shift 1 so that the volume .

そこで、()1気温II’信号に試づいて作動する直流
分シフト回v831を設4ノーr 、音速が遅いとき(
低排温時)は容積が小さりt「るように、また音速が速
いとき(’+11i+JI湛時> 4;を容(Nが大き
くなるように、コイル16に直流電圧をかし」でおき、
チューニング周波数の遷移を防いでいる。つまり、パワ
ーアンプ30からの信号による作動はすでに振動板14
がシフトされている状態で行なわれるようにしているの
である。
Therefore, we set up a DC component shift circuit v831 that operates based on the ()1 temperature II' signal when the sound speed is low (
When the volume is small (at low exhaust temperature), and when the sound velocity is high (+11i+JI > 4), apply DC voltage to the coil 16 so that the volume (N increases). ,
Prevents tuning frequency transitions. In other words, the operation based on the signal from the power amplifier 30 is already performed on the diaphragm 14.
This is done in such a way that it is carried out in a shifted state.

第6図には他の実施例を示す。FIG. 6 shows another embodiment.

この実施例は、共鳴室を廃止し、拡張室8の一部を画成
するようにベローズI3及び振動板14を取付りて容積
可変型の拡張室8を形成したものであり、作動原理は前
述の実施例と同じであるが、排気入口管6から拡張室8
に入る排気音に対し、直接逆位相の音を合成できるので
、消音効果については前述の実施例より大きい。
In this embodiment, the resonance chamber is abolished, and a bellows I3 and a diaphragm 14 are attached to define a part of the expansion chamber 8 to form a variable volume expansion chamber 8.The operating principle is Same as the previous embodiment, but from the exhaust inlet pipe 6 to the expansion chamber 8
Since it is possible to directly synthesize a sound with an opposite phase to the incoming exhaust sound, the silencing effect is greater than in the previous embodiments.

しかし、排気が直接ベローズ13に当るため、ベローズ
13を冷却する必要がある。このため、ケーシング20
に窓36を設けて、外気をケーシング20内に導入し、
ベローズ13及び振動板14を冷却すると同時に、窓3
6にネット37を取付けて、異物等が入り込まないよう
にしている。
However, since the exhaust gas directly hits the bellows 13, it is necessary to cool the bellows 13. For this reason, the casing 20
A window 36 is provided to introduce outside air into the casing 20,
While cooling the bellows 13 and the diaphragm 14, the window 3
A net 37 is attached to 6 to prevent foreign objects from entering.

以上説明したように本発明によれば、排気消音器内の拡
張室または共鳴室をベローズ構造とし、且つその一例を
振動板とし、この振動板を加振して排気脈動音と逆位相
の音を発生させることにより、消音を図るようにしたた
め、エンジン回転速度の低次成分である極(1(周波数
からの消音力呵能となり、1πM騒音、車室内こもり音
を改善できるという効果が得られる。
As explained above, according to the present invention, the expansion chamber or resonance chamber in the exhaust muffler has a bellows structure, and one example thereof is a diaphragm, and the diaphragm is vibrated to generate a sound with a phase opposite to the exhaust pulsation sound. Since the noise is suppressed by generating 1πM noise and muffled noise inside the vehicle, it becomes a silencing force from the low-order component of the engine rotational speed, ie, the pole (1) frequency. .

【図面の簡単な説明】[Brief explanation of drawings]

第1図は排気消音器の従来例を示す断面図である。第2
図〜第5図は本発明の一実施例を示し、第2図はエンジ
ン刊気糸の全体図、第3図は排気消音器の要部断面図、
第4図は信号発生回路のブロック図、第5図はfN号発
生回路作動状況図である。また、第6図は他の実施例を
示す排気消音器の要部断面図である。
FIG. 1 is a sectional view showing a conventional example of an exhaust muffler. Second
5 to 5 show an embodiment of the present invention, FIG. 2 is an overall view of the engine air line, FIG. 3 is a sectional view of the main part of the exhaust silencer,
FIG. 4 is a block diagram of the signal generating circuit, and FIG. 5 is a diagram showing the operation status of the fN signal generating circuit. Moreover, FIG. 6 is a sectional view of a main part of an exhaust muffler showing another embodiment.

Claims (1)

【特許請求の範囲】[Claims] エンジンの排気消音器内の拡張室又は共鳴室をベローズ
構造とし、且つその一例を振動板とすると共に、この振
動板を加振して前記拡張室又は共鳴室に到達する排気脈
動音と逆位相の音を発生させる加振装置を設けたことを
特徴とするエンジンの排気消音装置。
The expansion chamber or resonance chamber in the exhaust muffler of the engine has a bellows structure, and one example thereof is a diaphragm, and the diaphragm is vibrated to generate an exhaust pulsation sound that reaches the expansion chamber or resonance chamber in a phase opposite to that of the exhaust pulsation sound. An engine exhaust silencing device characterized by being provided with a vibration device that generates a sound.
JP9623982A 1982-06-07 1982-06-07 Silencer for exhaust sound of engine Granted JPS58214614A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9623982A JPS58214614A (en) 1982-06-07 1982-06-07 Silencer for exhaust sound of engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9623982A JPS58214614A (en) 1982-06-07 1982-06-07 Silencer for exhaust sound of engine

Publications (2)

Publication Number Publication Date
JPS58214614A true JPS58214614A (en) 1983-12-13
JPH0377370B2 JPH0377370B2 (en) 1991-12-10

Family

ID=14159674

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9623982A Granted JPS58214614A (en) 1982-06-07 1982-06-07 Silencer for exhaust sound of engine

Country Status (1)

Country Link
JP (1) JPS58214614A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0667815U (en) * 1993-02-25 1994-09-22 カルソニック株式会社 Active silencer
JP2015172370A (en) * 2014-03-04 2015-10-01 エーバーシュペッヒャー・エグゾースト・テクノロジー・ゲーエムベーハー・ウント・コンパニー・カーゲー active design of exhaust sound
FR3055659A1 (en) * 2016-09-06 2018-03-09 Peugeot Citroen Automobiles Sa COMPACT EXHAUST LINE WITH SILENCER
CN111828129A (en) * 2019-04-15 2020-10-27 广州汽车集团股份有限公司 Exhaust noise adjusting device and method, exhaust noise adjusting system and vehicle

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49100011U (en) * 1972-12-20 1974-08-28
JPS55129691A (en) * 1979-12-28 1980-10-07 Ebara Mfg Silencer
JPS5779208A (en) * 1980-10-31 1982-05-18 Fuji Heavy Ind Ltd Silencer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49100011U (en) * 1972-12-20 1974-08-28
JPS55129691A (en) * 1979-12-28 1980-10-07 Ebara Mfg Silencer
JPS5779208A (en) * 1980-10-31 1982-05-18 Fuji Heavy Ind Ltd Silencer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0667815U (en) * 1993-02-25 1994-09-22 カルソニック株式会社 Active silencer
JP2015172370A (en) * 2014-03-04 2015-10-01 エーバーシュペッヒャー・エグゾースト・テクノロジー・ゲーエムベーハー・ウント・コンパニー・カーゲー active design of exhaust sound
US9728176B2 (en) 2014-03-04 2017-08-08 Eberspächer Exhaust Technology GmbH & Co. KG Active design of exhaust sounds
FR3055659A1 (en) * 2016-09-06 2018-03-09 Peugeot Citroen Automobiles Sa COMPACT EXHAUST LINE WITH SILENCER
CN111828129A (en) * 2019-04-15 2020-10-27 广州汽车集团股份有限公司 Exhaust noise adjusting device and method, exhaust noise adjusting system and vehicle
CN111828129B (en) * 2019-04-15 2021-09-14 广州汽车集团股份有限公司 Exhaust noise adjusting device and method, exhaust noise adjusting system and vehicle

Also Published As

Publication number Publication date
JPH0377370B2 (en) 1991-12-10

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