JPH0622557U - Intake silencer - Google Patents
Intake silencerInfo
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- JPH0622557U JPH0622557U JP2526392U JP2526392U JPH0622557U JP H0622557 U JPH0622557 U JP H0622557U JP 2526392 U JP2526392 U JP 2526392U JP 2526392 U JP2526392 U JP 2526392U JP H0622557 U JPH0622557 U JP H0622557U
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- Prior art keywords
- intake
- resonance frequency
- flow velocity
- resonance
- pipe
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Abstract
(57)【要約】
【目的】 本考案は、車両の吸気系に装着された共鳴型
の吸気用消音器の改良に関し、吸気騒音に対応して制御
すべき共鳴周波数を最適に決定し、吸気騒音の低減を図
ることを目的とする。
【構成】 エンジンの吸気管路１途中に設けたブランチ
管２と、ブランチ管２の体積，ブランチ管２の長さ，ブ
ランチ管２の開口断面積のうちの少なくとも１以上の要
素を変化させて所定の共鳴周波数に設定する共鳴周波数
操作手段３と、吸気管路１内の吸気の流速に基づきその
流速において吸気騒音中に多く含まれる周波数成分と略
一致する共鳴周波数を決定して共鳴周波数の信号を共鳴
周波数操作手段３に送る制御手段４と、吸気管路２途中
に配設され、吸気の流速を検出して前記制御手段４に流
速信号を送る吸気流速検出手段５とを備えている。
(57) [Abstract] [Object] The present invention relates to an improvement of a resonance type intake silencer mounted on an intake system of a vehicle, in which the resonance frequency to be controlled in accordance with intake noise is optimally determined, The purpose is to reduce noise. [Structure] A branch pipe 2 provided in the middle of an intake pipe line 1 of an engine, and at least one of the volume of the branch pipe 2, the length of the branch pipe 2, and the opening cross-sectional area of the branch pipe 2 is changed. Based on the resonance frequency manipulating means 3 for setting a predetermined resonance frequency and the flow velocity of the intake air in the intake pipe line 1, a resonance frequency that substantially coincides with the frequency component contained in the intake noise at that flow velocity is determined to determine the resonance frequency. A control means 4 for sending a signal to the resonance frequency operating means 3 and an intake flow velocity detecting means 5 arranged in the intake pipe line 2 for detecting the flow velocity of the intake air and sending a flow velocity signal to the control means 4 are provided. .
Description
【０００１】[0001]
本考案は、車両のエンジンの吸気系に装着された共鳴型の吸気用消音器の改良 に関する。 The present invention relates to an improvement of a resonance type intake silencer mounted on an intake system of a vehicle engine.
【０００２】[0002]
車両のエンジンの吸気系には排気系と同様に消音器が組み込まれ、エンジンの 吸気管路で発生する吸気騒音を減衰させ、消音を図っている。吸気騒音は、気流 音等からなり、この吸気騒音を低減するために、例えば、共鳴室を有する消音器 が用いられている。しかし、共鳴作用により消音する場合、ヘルムホルツの式に より消音可能な周波数成分はチューニングされた特定の共鳴周波数に限定される 。 Like the exhaust system, a muffler is built into the intake system of the vehicle's engine to reduce intake noise generated in the engine's intake pipe line to reduce noise. The intake noise consists of airflow noise and the like, and in order to reduce the intake noise, for example, a silencer having a resonance chamber is used. However, when the sound is silenced by the resonance effect, the frequency components that can be silenced by the Helmholtz equation are limited to the specific tuned resonance frequency.
【０００３】 ここで、エンジンの運転状態に応じて吸気騒音の各周波数成分の騒音レベルも 変化する。共鳴型の消音器を使用した場合、エンジンの運転状態に応じて騒音の レベルが大きい周波数成分を低減することが望まれる。そのためには、例えば、 エンジン回転数に応じて共鳴周波数を変化させる吸気用消音器が、実開昭５８− １７２０５０号公報に示すように提案されている（図３に図示）。Here, the noise level of each frequency component of intake noise also changes according to the operating state of the engine. When a resonance type silencer is used, it is desired to reduce frequency components having a large noise level according to the operating state of the engine. To this end, for example, an intake silencer that changes the resonance frequency according to the engine speed has been proposed as shown in Japanese Utility Model Laid-Open No. 172050/58 (illustrated in FIG. 3).
【０００４】 図において、符号１０１はエンジンの吸気管路で、この吸気管路１０１の途中 に外管１０２を介して共鳴室１０３が設けられている。 この外管１０２内には、外管１０２の側壁面１０２Ａを往復自在の内管１０４ と、内管１０４を作動させるアクチュエータ（図示せず）とから構成される。そ して、内管１０４及び外管１０２で共鳴管１０５が構成され、内管１０４を作動 させることにより、共鳴管１０５の長さが、エンジン回転数に応じて所定の共鳴 周波数に設定されるように変化されるようになっている。In the figure, reference numeral 101 is an intake pipe of the engine, and a resonance chamber 103 is provided in the middle of the intake pipe 101 via an outer pipe 102. Inside the outer pipe 102, a side wall surface 102A of the outer pipe 102 is composed of an inner pipe 104 that can reciprocate, and an actuator (not shown) that operates the inner pipe 104. The inner tube 104 and the outer tube 102 constitute a resonance tube 105, and by operating the inner tube 104, the length of the resonance tube 105 is set to a predetermined resonance frequency according to the engine speed. Is being changed.
【０００５】[0005]
【考案が解決しようとする課題】 一般に、吸気騒音は、気流音等からなるが、この吸気騒音は、吸気の流速が速 いと、吸気騒音中に含まれるは高周波数成分のうちの高い部分が多くなり、吸気 の流速が遅いと、高周波数成分のうちの低い部分が少なくなるとされている（例 えば、共立出版株式会社；福田基一，奥田襄介共著「騒音対策と消音設計」Ｓ５ ７．９．１０第９刷，Ｐ６９参照） ところが、従来の吸気用消音器にあっては、エンジン回転数に応じて、共鳴管 １０５の長さを変化させているので、必ずしも、吸気騒音中に含まれる周波数成 分を直接検出せず、吸気騒音に対応して制御すべき共鳴周波数を最適に決定する ことができず、依然として、吸気騒音が高いという問題があった。Generally speaking, intake noise is composed of air flow noise, etc., but if the intake air velocity is high, this intake noise has a high portion of high frequency components included in the intake noise. It is said that when the flow velocity of intake air increases, the low part of the high frequency component decreases (eg Kyoritsu Shuppan Co., Ltd .; Motoichi Fukuda and Yosuke Okuda, "Noise control and noise reduction design" S57. However, in the conventional silencer for intake air, the length of the resonance tube 105 is changed according to the engine speed, so that the intake noise is not always detected during intake noise. Since the included frequency components were not directly detected, the resonance frequency to be controlled could not be optimally determined according to the intake noise, and there was still the problem of high intake noise.
【０００６】 例えば、エンジンが同一回転数の場合でも、車両が坂路を登る場合，定低走行 の場合，坂路を下る場合等の各運転状態では、それぞれ、吸気管路内の吸気の流 速が異なり、従って、吸気騒音の状態（周波数成分の分布）が異なるが、共鳴周 波数操作手段により共鳴管の長さが同一に制御され、同一の共鳴周波数にしか対 応されない。For example, even when the engine has the same rotation speed, in each operating state such as when the vehicle climbs a slope, when traveling at a constant low speed, when descending a slope, the flow velocity of the intake air in the intake pipe line is different. Different, therefore, the state of intake noise (frequency component distribution) is different, but the resonance frequency control means controls the lengths of the resonance tubes to be the same, and only responds to the same resonance frequency.
【０００７】 本考案は、上述の問題点を解決するためになされたもので、その目的は、吸気 騒音に対応して制御すべき共鳴周波数を最適に決定し、吸気騒音の低減を図るこ とができる吸気用消音器を提供することである。The present invention has been made to solve the above problems, and an object thereof is to optimally determine a resonance frequency to be controlled in response to intake noise and to reduce intake noise. The purpose of the present invention is to provide an intake silencer capable of
【０００８】[0008]
請求項１記載の考案は、エンジンの吸気管路途中に設けたブランチ管と、ブラ ンチ管の体積，ブランチ管の長さ，ブランチ管の開口断面積のうちの少なくとも １以上の要素を変化させて所定の共鳴周波数に設定する共鳴周波数操作手段と、 吸気管路内の吸気の流速に基づきその流速において吸気騒音中に多く含まれる周 波数成分と略一致する共鳴周波数を決定して共鳴周波数の信号を共鳴周波数操作 手段に送る制御手段と、吸気管路途中に配設され、吸気の流速を検出して前記制 御手段に流速信号を送る吸気流速検出手段とを備えていることを特徴とする。 According to a first aspect of the present invention, at least one of the branch pipe provided in the middle of the intake pipe of the engine, the volume of the branch pipe, the length of the branch pipe, and the opening cross-sectional area of the branch pipe is changed. Based on the flow velocity of the intake air in the intake pipe, the resonance frequency operating means for setting the resonance frequency to a predetermined resonance frequency is determined to determine the resonance frequency that substantially matches the frequency component often contained in the intake noise at that flow velocity. A control means for sending a signal to the resonance frequency operating means, and an intake air flow velocity detecting means arranged in the middle of the intake pipe for detecting the flow velocity of the intake air and sending a flow velocity signal to the control means. To do.
【０００９】 請求項２記載の考案は、エンジンの吸気管路途中に共鳴管を介して設けた共鳴 室と、共鳴室の体積，共鳴管の長さ，共鳴管の開口断面積のうちの少なくとも１ 以上の要素を変化させて所定の共鳴周波数に設定する共鳴周波数操作手段と、吸 気管路内の吸気の流速に基づきその流速において吸気騒音中に多く含まれる周波 数成分と略一致する共鳴周波数を決定して共鳴周波数の信号を共鳴周波数操作手 段に送る制御手段と、吸気管路途中に配設され、吸気の流速を検出して前記制御 手段に流速信号を送る吸気流速検出手段とを備えていることを特徴とする。According to a second aspect of the present invention, at least the resonance chamber provided in the middle of the intake pipe of the engine through the resonance pipe, the volume of the resonance chamber, the length of the resonance pipe, and the opening cross-sectional area of the resonance pipe. Resonance frequency operating means for changing the one or more elements to set a predetermined resonance frequency, and a resonance frequency that substantially matches a frequency component that is often contained in intake noise at the flow velocity based on the flow velocity of the intake air in the intake pipe line. And a control means for sending a signal of the resonance frequency to the resonance frequency operating means, and an intake flow velocity detecting means arranged in the middle of the intake pipe for detecting the flow velocity of the intake air and sending a flow velocity signal to the control means. It is characterized by having.
【００１０】[0010]
請求項１記載の考案においては、吸気流速検出手段により吸気の流速が検出さ れ、その流速信号が制御手段に送られる。制御手段においては、吸気の流速信号 に基づき、その流速において吸気騒音中に多く含まれる周波数成分と略一致する 共鳴周波数が決定される。 According to the first aspect of the invention, the flow velocity of the intake air is detected by the intake flow velocity detecting means, and the flow velocity signal is sent to the control means. In the control means, the resonance frequency that substantially matches the frequency component contained in the intake noise at the flow velocity is determined based on the intake flow velocity signal.
【００１１】 その際、例えば、流速が速くなると、吸気騒音中に含まれる高周波数成分の中 で高い部分が多くなり、この高周波数成分のうちの高い部分に一致するように、 共鳴周波数が極めて高く決定される。一方、流速が遅くなると、吸気騒音中に含 まれる高周波数成分の中で低い部分が多くなり、この高周波数成分のうちの低い 部分にに一致するように、共鳴周波数が比較的高く決定される。At this time, for example, as the flow velocity becomes faster, the high frequency component in the high frequency component contained in the intake noise increases, and the resonance frequency becomes extremely high so as to match the high frequency component in the high frequency component. Highly determined. On the other hand, when the flow velocity becomes slow, the low frequency part of the high frequency component contained in the intake noise increases, and the resonance frequency is determined to be relatively high so as to match the low frequency part of this high frequency component. It
【００１２】 この決定された共鳴周波数により、共鳴周波数操作手段が作動し、ブランチ管 の体積，ブランチ管の長さ，ブランチ管の開口断面積のうちの少なくとも１以上 の要素が操作してその状態が変化され、ヘルムホルツの式により、共鳴周波数が 設定される。The resonance frequency operating means is actuated by the determined resonance frequency, and at least one element of the volume of the branch pipe, the length of the branch pipe, and the opening cross-sectional area of the branch pipe is operated, and the state is maintained. Is changed and the resonance frequency is set by the Helmholtz equation.
【００１３】 そして、例えば、吸気の流速が速くなると、吸気騒音中に含まれる高周波数成 分の中で高い部分が、上述のように極めて高く設定された共鳴周波数に共鳴する 。Then, for example, when the flow velocity of the intake air becomes high, a high portion of the high frequency components included in the intake noise resonates at the resonance frequency set extremely high as described above.
【００１４】 一方、吸気の流速が遅くなると、吸気騒音中に含まれる高周波数成分の中で低 い部分が、上述のように比較的高く設定された共鳴周波数に共鳴する。 即ち、流速が変化すると、流速に対応して発生する吸気騒音のうち、設定され た共鳴周波数と同一周波数の周波数成分の音波が共鳴周波数に共鳴して低減され る。On the other hand, when the flow velocity of the intake air becomes slow, a low portion of the high frequency components included in the intake noise resonates with the resonance frequency set relatively high as described above. That is, when the flow velocity changes, of the intake noise generated corresponding to the flow velocity, the sound wave of the frequency component having the same frequency as the set resonance frequency resonates with the resonance frequency and is reduced.
【００１５】 請求項２記載の考案においても同様の作用が生じる。In the device according to the second aspect, the same action occurs.
【００１６】[0016]
以下、図面により本考案の実施例について説明する。 図１は本考案の第１実施例に係わる吸気用消音器を示す。 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an intake silencer according to a first embodiment of the present invention.
【００１７】 図において、符号１はエンジンの吸気管路で、この吸気管路１の途中にブラン チ管２が設けられている。 このブランチ管２には、共鳴周波数操作手段３が設けられている。共鳴周波数 操作手段３は、ブランチ管２の側壁面２Ａを往復自在のピストン３Ａと、ピスト ン３Ａを作動させるシリンダ３Ｂとから構成され、ブランチ管２の体積，ブラン チ管２の長さを、所定の共鳴周波数が設定されるように変化させる。In the figure, reference numeral 1 is an intake pipe of the engine, and a branch pipe 2 is provided in the intake pipe 1. The branch pipe 2 is provided with a resonance frequency operating means 3. The resonance frequency operating means 3 is composed of a piston 3A that can reciprocate on the side wall surface 2A of the branch pipe 2 and a cylinder 3B that operates the piston 3A. The volume of the branch pipe 2 and the length of the branch pipe 2 are It is changed so that a predetermined resonance frequency is set.
【００１８】 共鳴周波数操作手段３には、制御手段４が接続され、この制御手段４は、マイ クロコンピュータを有しており、吸気管路１内の吸気の流速に基づきその流速に おいて吸気騒音中に多く含まれる周波数成分と一致する共鳴周波数を決定し、共 鳴周波数に対応する操作量を含む指令を共鳴周波数操作手段３に送る。A control means 4 is connected to the resonance frequency operating means 3, and this control means 4 has a micro computer, and based on the flow velocity of the intake air in the intake pipe line 1, A resonance frequency that coincides with a frequency component included in a lot of noise is determined, and a command including an operation amount corresponding to the resonance frequency is sent to the resonance frequency operating means 3.
【００１９】 そして、吸気管路１の途中にピトー管５からなる吸気流速検出手段が配設され 、ピトー管５は吸気の流速を検出して前記制御手段４に流速信号を送るようにな っている。Then, an intake flow velocity detecting means composed of a pitot pipe 5 is arranged in the middle of the intake pipe line 1, and the pitot pipe 5 detects the flow velocity of the intake air and sends a flow velocity signal to the control means 4. ing.
【００２０】 しかして、本実施例においては、ピトー管５により吸気の流速が検出され、そ の流速信号が電圧信号，電流信号として制御手段４に送られる。制御手段４にお いては、吸気の流速信号に基づき、その流速において吸気騒音中に多く含まれる 周波数成分と一致する共鳴周波数が決定される。Therefore, in this embodiment, the flow velocity of the intake air is detected by the Pitot tube 5, and the flow velocity signal is sent to the control means 4 as a voltage signal and a current signal. In the control means 4, the resonance frequency that coincides with the frequency component mostly contained in the intake noise at the flow velocity is determined based on the intake flow velocity signal.
【００２１】 即ち、制御手段４においては、その記憶装置に、流速と吸気騒音中の周波数成 分の関係を示すマップが記憶されており、このマップと入力された流速信号がＣ ＰＵ上で比較され、流速において吸気騒音中に多く含まれる周波数成分と一致す る共鳴周波数が決定される。That is, in the control means 4, a map showing the relationship between the flow velocity and the frequency component in the intake noise is stored in the storage device, and this map and the input flow velocity signal are compared on the CPU. Then, the resonance frequency that matches the frequency component contained in the intake noise in the flow velocity is determined.
【００２２】 その際、例えば、流速が速くなると、吸気騒音中に含まれる高周波数成分の中 で高い部分が多くなり、この高周波数成分のうちの高い部分に一致するように、 共鳴周波数が極めて高く決定される。一方、流速が遅くなると、吸気騒音中に含 まれる高周波数成分の中で低い部分が多くなり、この高周波数成分のうちの低い 部分にに一致するように、共鳴周波数が比較的高く決定される。At this time, for example, when the flow velocity becomes faster, the high frequency component in the high frequency component contained in the intake noise increases, and the resonance frequency becomes extremely high so as to match the high frequency component in the high frequency component. Highly determined. On the other hand, when the flow velocity becomes slow, the low frequency part of the high frequency component contained in the intake noise increases, and the resonance frequency is determined to be relatively high so as to match the low frequency part of this high frequency component. It
【００２３】 そして、共鳴周波数に対応したストロークだけ、共鳴周波数操作手段３のシリ ンダ３Ｂが移動し、ピストン３Ａがブランチ管２内を作動する。これにより、ブ ランチ管２の体積，ブランチ管２の長さの２つの要素が操作され、その状態が変 化され、ヘルムホルツの式により、共鳴周波数が設定される。Then, the cylinder 3B of the resonance frequency operating means 3 moves by the stroke corresponding to the resonance frequency, and the piston 3A operates in the branch pipe 2. As a result, the two elements of the volume of the branch tube 2 and the length of the branch tube 2 are manipulated to change their states, and the resonance frequency is set by the Helmholtz equation.
【００２４】 そして、例えば、流速が速くなると、吸気騒音中に含まれる高周波数成分の中 で高い部分が、上述のように極めて高く設定された共鳴周波数に共鳴する。 一方、流速が遅くなると、吸気騒音中に含まれる高周波数成分の中で低い部分 が、上述のように比較的高く設定された共鳴周波数に共鳴する。Then, for example, when the flow velocity becomes high, a high portion of the high frequency components included in the intake noise resonates at the resonance frequency set extremely high as described above. On the other hand, when the flow velocity becomes slow, a low portion of the high frequency components included in the intake noise resonates with the resonance frequency set relatively high as described above.
【００２５】 即ち、流速が変化すると、流速に対応して発生する吸気騒音のうち、設定され た共鳴周波数と同一周波数の周波数成分の音波が共鳴周波数に共鳴して低減され る。That is, when the flow velocity changes, of the intake noise generated corresponding to the flow velocity, the sound wave of the frequency component having the same frequency as the set resonance frequency resonates with the resonance frequency and is reduced.
【００２６】 以上の如き構成によれば、ピトー管５により吸気の流速を検出し、この吸気の 流速に応じて共鳴周波数操作手段３を作動させて共鳴周波数を設定するようにし たので、従来におけるエンジン回転数に応じて例えば共鳴管の長さを変化させて 共鳴周波数を設定する場合に比して、吸気騒音中に多く含まれる周波数成分の分 布（周波数の高低）に直接的に関与する吸気の流速を、共鳴周波数を決定するた めの検出手段とすることができ、吸気騒音中に多く含まれる周波数成分をエンジ ン回転数を介在させずに直接検出することができ、共鳴周波数を最適に決定する ことができ、吸気騒音の消音効率を向上させることができる。According to the above-mentioned configuration, the flow velocity of the intake air is detected by the Pitot tube 5, and the resonance frequency operating means 3 is operated according to the flow velocity of the intake air to set the resonance frequency. Compared with the case where the resonance frequency is set by changing the length of the resonance tube according to the engine speed, for example, it is directly involved in the distribution of frequency components (high and low frequencies) included in intake noise. The flow velocity of the intake air can be used as a detection means for determining the resonance frequency, and the frequency component often contained in the intake noise can be directly detected without interposing the engine speed, and the resonance frequency can be determined. It is possible to make an optimum decision, and it is possible to improve the muffling efficiency of intake noise.
【００２７】 なお、本実施例においては、共鳴周波数操作手段３は、ピストン３Ａを作動さ せてブランチ管２の体積，ブランチ管２の長さを変化させる構成になっているが 、ブランチ管２の開口断面積を変化させて共鳴周波数を設定するようししても良 く、また、ブランチ管２の体積，ブランチ管２の長さ，ブランチ管２の開口断面 積を同時に変化させて、ブランチ管２により共鳴周波数を設定しても良い。要す るに、ブランチ管２の体積，ブランチ管２の長さ，ブランチ管２の開口断面積の うちの少なくとも１以上の要素を、ブランチ管２により所定の共鳴周波数が設定 されるように変化させることができる。In the present embodiment, the resonance frequency operating means 3 is configured to operate the piston 3A to change the volume of the branch pipe 2 and the length of the branch pipe 2, but the branch pipe 2 The resonance frequency may be set by changing the opening cross-sectional area of the branch pipe, or by changing the volume of the branch pipe 2, the length of the branch pipe 2, and the opening cross-sectional area of the branch pipe 2 simultaneously. The resonance frequency may be set by the tube 2. In short, at least one element of the volume of the branch pipe 2, the length of the branch pipe 2, and the opening cross-sectional area of the branch pipe 2 is changed so that the branch pipe 2 sets a predetermined resonance frequency. Can be made.
【００２８】 図２は本考案の第２実施例に係わる吸気用消音器を示す。 図において、符号１１はエンジンの吸気管路で、この吸気管路１１の途中に外 管１２を介して共鳴室１３が設けられている。FIG. 2 shows an intake silencer according to a second embodiment of the present invention. In the figure, reference numeral 11 is an intake pipe line of the engine, and a resonance chamber 13 is provided in the intake pipe line 11 via an outer pipe 12.
【００２９】 この外管１２には、共鳴周波数操作手段１４が設けられている。共鳴周波数操 作手段１４は、外管１２の側壁面１２Ａを往復自在の内管１５Ａと、内管１５Ａ を作動させるシリンダ１５Ｂとから構成される。そして、内管１５Ａ及び外管１ ２で共鳴管１６が構成され、共鳴管１６の長さが、所定の共鳴周波数に設定され るように変化される。The outer tube 12 is provided with a resonance frequency operating means 14. The resonance frequency operating means 14 is composed of an inner tube 15A which is capable of reciprocating the side wall surface 12A of the outer tube 12 and a cylinder 15B which operates the inner tube 15A. The inner tube 15A and the outer tube 12 constitute a resonance tube 16, and the length of the resonance tube 16 is changed so as to be set to a predetermined resonance frequency.
【００３０】 共鳴周波数操作手段１４には、制御手段１７が制御され、この制御手段１７は 、マイクロコンピュータを有しており、吸気管路１１内の吸気の流速に基づきそ の流速において吸気騒音中に多く含まれる周波数成分と一致する共鳴周波数を決 定して共鳴周波数の信号を共鳴周波数操作手段１４に送る。A control means 17 is controlled by the resonance frequency operating means 14, and this control means 17 has a microcomputer, and based on the flow velocity of the intake air in the intake pipe line 11, the intake noise noise is detected. The resonance frequency corresponding to the frequency component included in a large number is determined and a signal of the resonance frequency is sent to the resonance frequency operating means 14.
【００３１】 そして、吸気管路１１の途中にピトー管１８からなる吸気流速検出手段が配設 され、ピトー管１８は吸気の流速を検出して前記制御手段１７に流速信号を送る ようになっている。An intake flow velocity detecting means composed of a pitot pipe 18 is arranged in the middle of the intake pipe line 11, and the pitot pipe 18 detects the flow velocity of intake air and sends a flow velocity signal to the control means 17. There is.
【００３２】 第２実施例によれば、第１実施例と同様の作用，効果を奏する。 なお、本実施例においては、共鳴周波数操作手段１４は、内管１５Ａを作動さ せて共鳴管１６の長さを変化させる構成になっているが、共鳴管１６の開口断面 積を変化させて共鳴周波数を設定するようししても良く、また、共鳴管１６の体 積，共鳴管１６の長さ，共鳴室１３の容積を同時に変化させて共鳴周波数を設定 しても良い。要するに、共鳴室１３の体積，共鳴管１６の長さ，共鳴管１６の開 口断面積のうちの少なくとも１以上の要素を、共鳴室１３及び共鳴管１６により 所定の共鳴周波数が設定されるように変化させることができる。According to the second embodiment, the same operation and effect as those of the first embodiment are obtained. In the present embodiment, the resonance frequency operating means 14 is configured to operate the inner pipe 15A to change the length of the resonance pipe 16, but the resonance cross-section of the resonance pipe 16 is changed. The resonance frequency may be set, or the volume of the resonance tube 16, the length of the resonance tube 16 and the volume of the resonance chamber 13 may be simultaneously changed to set the resonance frequency. In short, at least one element of the volume of the resonance chamber 13, the length of the resonance tube 16, and the opening cross-sectional area of the resonance tube 16 is set so that the resonance chamber 13 and the resonance tube 16 set a predetermined resonance frequency. Can be changed to.
【００３３】[0033]
以上説明したように、本考案に係る吸気用消音器は、吸気流速検出手段により 吸気の流速を検出し、吸気の流速に応じて共鳴周波数操作手段を作動させて共鳴 周波数を設定するようにしたもので、従来におけるエンジン回転数に応じて例え ば共鳴管の長さを変化させて共鳴周波数を設定する場合に比して、吸気騒音中に 多く含まれる周波数成分の分布（周波数の高低）に直接的に関与する吸気の流速 を、共鳴周波数を決定するための検出手段としているので、吸気騒音中に多く含 まれる周波数成分をエンジン回転数を介在させずに直接検出することができ、共 鳴周波数を最適に決定することができ、吸気騒音の消音効率を向上させることが できる効果を奏する。 As described above, in the intake silencer according to the present invention, the flow velocity of the intake air is detected by the intake flow velocity detecting means, and the resonance frequency operating means is operated according to the flow velocity of the intake air to set the resonance frequency. However, compared to the conventional case where the resonance frequency is set by changing the length of the resonance tube according to the engine speed, the distribution of frequency components (high and low frequencies) often included in intake noise is Since the flow velocity of the intake air, which is directly involved, is used as the detection means for determining the resonance frequency, the frequency component often contained in the intake noise can be directly detected without interposing the engine speed. The ringing frequency can be optimally determined, and the effect of silencing the intake noise can be improved.
【図１】本考案の第１実施例に係わる吸気用消音器の構
成図である。FIG. 1 is a configuration diagram of an intake silencer according to a first embodiment of the present invention.
【図２】本考案の第２実施例に係わる吸気用消音器の構
成図である。FIG. 2 is a configuration diagram of an intake silencer according to a second embodiment of the present invention.
【図３】従来における吸気用消音器の構成図である。FIG. 3 is a configuration diagram of a conventional intake silencer.
１ 吸気管路 ２ ブランチ管 ３ 共鳴周波数操作手段 ４ 制御手段 ５ ピトー管 1 intake pipe line 2 branch pipe 3 resonance frequency operating means 4 control means 5 pitot tube
Claims (2)
ブランチ管（２）と、 ブランチ管（２）の体積，ブランチ管（２）の長さ，ブ
ランチ管（２）の開口断面積のうちの少なくとも１以上
の要素を変化させて所定の共鳴周波数に設定する共鳴周
波数操作手段（３）と、 吸気管路（１）内の吸気の流速に基づきその流速におい
て吸気騒音中に多く含まれる周波数成分と略一致する共
鳴周波数を決定して共鳴周波数の信号を共鳴周波数操作
手段（３）に送る制御手段（４）と、 吸気管路（２）途中に配設され、吸気の流速を検出して
前記制御手段（４）に流速信号を送る吸気流速検出手段
（５）とを備えていることを特徴とする吸気用消音器。1. A branch pipe (2) provided in the middle of an intake pipe line (1) of an engine, a volume of the branch pipe (2), a length of the branch pipe (2), and an opening cross-sectional area of the branch pipe (2). Of the resonance frequency operating means (3) for changing at least one of the elements to set a predetermined resonance frequency, and based on the flow velocity of the intake air in the intake pipe line (1), a large amount is included in the intake noise at that flow velocity. Control means (4) for sending a resonance frequency signal to the resonance frequency manipulating means (3) for determining a resonance frequency that substantially matches the frequency component to be generated, and an intake flow rate for controlling the intake flow velocity. An intake silencer comprising: an intake air flow velocity detecting means (5) for detecting and transmitting a flow velocity signal to the control means (4).
管（１６）を介して設けた共鳴室（１３）と、 共鳴室（１３）の体積，共鳴管（１６）の長さ，共鳴管
（１６）の開口断面積のうちの少なくとも１以上の要素
を変化させて所定の共鳴周波数に設定する共鳴周波数操
作手段（１４）と、 吸気管路（１１）内の吸気の流速に基づきその流速にお
いて吸気騒音中に多く含まれる周波数成分と略一致する
共鳴周波数を決定して共鳴周波数の信号を共鳴周波数操
作手段に送る制御手段（１７）と、 吸気管路（１１）途中に配設され、吸気の流速を検出し
て前記制御手段（１６）に流速信号を送る吸気流速検出
手段（１８）とを備えていることを特徴とする吸気用消
音器。2. A resonance chamber (13) provided through a resonance pipe (16) in the intake pipe (11) of the engine, a volume of the resonance chamber (13), a length of the resonance pipe (16), and resonance. Resonance frequency operating means (14) for changing at least one element of the opening cross-sectional area of the pipe (16) to set it to a predetermined resonance frequency, and the resonance frequency operating means (14) based on the flow velocity of the intake air in the intake pipe line (11). A control means (17) for determining a resonance frequency that substantially coincides with a frequency component included in intake noise at a flow velocity and sending a signal of the resonance frequency to the resonance frequency operating means, and a control means (17) disposed in the middle of the intake conduit (11). An intake silencer characterized by comprising: an intake flow velocity detecting means (18) for detecting an intake flow velocity and sending a flow velocity signal to the control means (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2526392U JPH0622557U (en) | 1992-04-20 | 1992-04-20 | Intake silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2526392U JPH0622557U (en) | 1992-04-20 | 1992-04-20 | Intake silencer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0622557U true JPH0622557U (en) | 1994-03-25 |
Family
ID=12161145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2526392U Pending JPH0622557U (en) | 1992-04-20 | 1992-04-20 | Intake silencer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0622557U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100251174B1 (en) * | 1996-12-11 | 2000-04-15 | 정몽규 | The resonator |
| JP2023017692A (en) * | 2021-07-26 | 2023-02-07 | 江蘇科技大学 | Helmholtz silencer of double cavity coupling and control method |
-
1992
- 1992-04-20 JP JP2526392U patent/JPH0622557U/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100251174B1 (en) * | 1996-12-11 | 2000-04-15 | 정몽규 | The resonator |
| JP2023017692A (en) * | 2021-07-26 | 2023-02-07 | 江蘇科技大学 | Helmholtz silencer of double cavity coupling and control method |
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