JP2832050B2 - Intake structure of internal combustion engine - Google Patents
Intake structure of internal combustion engineInfo
- Publication number
- JP2832050B2 JP2832050B2 JP32133189A JP32133189A JP2832050B2 JP 2832050 B2 JP2832050 B2 JP 2832050B2 JP 32133189 A JP32133189 A JP 32133189A JP 32133189 A JP32133189 A JP 32133189A JP 2832050 B2 JP2832050 B2 JP 2832050B2
- Authority
- JP
- Japan
- Prior art keywords
- diaphragm
- intake
- internal combustion
- combustion engine
- engine
- 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.)
- Expired - Lifetime
Links
- 238000002485 combustion reaction Methods 0.000 title claims description 7
- 230000010349 pulsation Effects 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 7
- 238000013016 damping Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Landscapes
- Characterised By The Charging Evacuation (AREA)
Description
【発明の詳細な説明】 《産業上の利用分野》 この発明は内燃機関の吸気構造に関し、特に吸気脈動
を利用して膜振動を発生させることで吸気効率を向上さ
せる構造に関する。The present invention relates to an intake structure for an internal combustion engine, and more particularly to a structure for improving intake efficiency by generating membrane vibration using intake pulsation.
《従来の技術》 最近では自動車用のエンジンの高出力化に伴い、吸入
空気量の増加が望まれている。<< Conventional Technology >> Recently, with an increase in the output of an automobile engine, an increase in the amount of intake air is desired.
このことから、現在では可変吸気システムを採用する
ことが種々研究されている。For this reason, various studies have been made on adopting a variable intake system at present.
《発明が解決しようとする課題》 この発明は、内燃機関における吸入空気の脈動を利用
して吸気構造体を膜振動させ、これにより吸入効果を増
大させることを目的としている。<< Problems to be Solved by the Invention >> It is an object of the present invention to utilize the pulsation of intake air in an internal combustion engine to cause a membrane vibration of an intake structure, thereby increasing an intake effect.
また、この発明では、以上の作動を既存の吸気系構造
物を利用して行えるようにすることを他の目的としてい
る。It is another object of the present invention to enable the above operation to be performed using an existing intake system structure.
《課題を解決するための手段》 前記目的を達成するため、この発明は、エアクリーナ
のカバーに形成した穴に張設されたダイヤフラムと、こ
のダイヤフラムの固有振動数を変化させるため前記カバ
ーに設けられてダイヤフラムの張力を調整する制振手段
と、内燃機関の回転数を検知する検知手段と、この検知
手段の検知出力に応じて前記制振手段を作動させるため
の制御手段とを備え、ダイヤフラムを吸気脈動に応じて
振動させるようにした。<< Means for Solving the Problems >> In order to achieve the above object, the present invention provides a diaphragm stretched in a hole formed in a cover of an air cleaner, and a diaphragm provided on the cover to change a natural frequency of the diaphragm. Vibration control means for adjusting the tension of the diaphragm, detecting means for detecting the rotation speed of the internal combustion engine, and control means for operating the vibration control means in accordance with the detection output of the detection means. Vibration was made in response to intake pulsation.
《作 用》 以上の構成によれば、吸入空気の脈動の周波数と、ダ
イヤフラムの固有振動数とを一致させることで吸気負圧
を増大すべくダイヤフラムが振動し、吸入効果を高める
ことができる。<< Operation >> According to the above configuration, by making the frequency of the pulsation of the intake air coincide with the natural frequency of the diaphragm, the diaphragm vibrates to increase the intake negative pressure, and the suction effect can be enhanced.
さらに、制振手段を設けることで機関の回転数変化に
追随させてダイヤフラムを必要な回転領域でのみ振動さ
せることができる。Further, by providing the vibration damping means, it is possible to vibrate the diaphragm only in a necessary rotation region in accordance with the change in the engine speed.
《実 施 例》 以下、この発明の一実施例を図面を用いて詳細に説明
する。<< Embodiment >> Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
第１図において、１はエンジン２のキャブレタに接続
されたエアクリーナであって、このエアクリーナ１は、
周囲に吸気口3aを設け、下部に前記キャブレタに連通す
る空気出口3bを形成したケース３と、ケース３の上面開
口に装着されたカバー４、およびケース３内部にあって
吸気口3a側と出口3b側を仕切るリング状のフィルタエレ
メント５とから基本的に構成されている。In FIG. 1, reference numeral 1 denotes an air cleaner connected to a carburetor of an engine 2;
A case 3 having an air inlet 3a provided therearound and an air outlet 3b communicating with the carburetor at a lower portion, a cover 4 mounted on an upper opening of the case 3, and an air inlet 3a inside the case 3 and an outlet It basically comprises a ring-shaped filter element 5 that partitions the 3b side.
カバー４の中央には例えばゴム膜などからなるダイヤ
フラム６が張設され、前記空気出口3bの上部に対面して
いる。At the center of the cover 4, a diaphragm 6 made of, for example, a rubber film is stretched, and faces the upper part of the air outlet 3b.
このダイヤフラム６の固有振動数は、エンジン２の吸
入効率を高めたい回転数領域に合わせた振動数に設定さ
れている。The natural frequency of the diaphragm 6 is set to a frequency corresponding to a rotation speed region in which the suction efficiency of the engine 2 is to be increased.
また、このダイヤフラム６の周囲部にあって、カバー
５上には、一端を前記ダイヤフラム６に結合した制振手
段としてのアクチュエータ７が設けられている。In addition, an actuator 7 is provided on the cover 5 around the diaphragm 6 as a vibration damping means, one end of which is connected to the diaphragm 6.
一方エンジン２の出力軸には、回転検出手段としての
回転計８が設けられ、この回転計８の検知出力はワンチ
ップマイコンなどによって構成される制御部９に入力さ
れる。On the other hand, a tachometer 8 is provided on the output shaft of the engine 2 as rotation detection means, and a detection output of the tachometer 8 is input to a control unit 9 constituted by a one-chip microcomputer or the like.
この制御部９にはエンジン２の回転数に応じたダイヤ
フラム６の最適張力に相当するアクチュエータ７の駆動
力が予めプログラムされており、前記回転計８の検出出
力に応じて前記アクチュエータ７に対する駆動信号を出
力し、これに応じてアクチュエータ７はダイヤフラム６
に対する張力を調整し、固有振動数を変化させる。The control unit 9 is programmed in advance with a driving force of the actuator 7 corresponding to the optimum tension of the diaphragm 6 according to the rotation speed of the engine 2, and a driving signal for the actuator 7 in accordance with the detection output of the tachometer 8. Is output, and the actuator 7 responds accordingly to the diaphragm 6
Is adjusted to change the natural frequency.
以上の構成において、エンジン２が回転し、その結果
エアクリーナ１に空気が吸入されると、回転周波数に応
じた周波数の吸気脈動がエアクリーナ１の内部に発生す
る。そして、この吸気脈動の周波数がダイヤフラム６の
固有振動数に一致する、すなわち、エンジン２に要求さ
れる吸入効率を高めたい回転数領域になると、ダイヤフ
ラム６は吸気脈動と同期して振動し、その結果、吸気脈
動と共鳴し、ダイヤフラム６がポンプの役目をはたし、
吸入効率を高めることになる。In the above configuration, when the engine 2 rotates and, as a result, air is sucked into the air cleaner 1, intake pulsation having a frequency corresponding to the rotation frequency is generated inside the air cleaner 1. When the frequency of the intake pulsation coincides with the natural frequency of the diaphragm 6, that is, when the intake pulsation required for the engine 2 is in a rotation speed region in which it is desired to increase the efficiency, the diaphragm 6 oscillates in synchronization with the intake pulsation. As a result, it resonates with the intake pulsation, and the diaphragm 6 serves as a pump,
Inhalation efficiency will be improved.
さらに、回転数変化に応じてアクチュエータ７が駆動
されると、ダイヤフラム６の張力は変化し、その固有振
動数は吸気脈動の周波数に追随するので、吸気効率を高
めたい領域以外であっても、吸気効率が向上することに
なる。Further, when the actuator 7 is driven according to the rotation speed change, the tension of the diaphragm 6 changes, and its natural frequency follows the frequency of the intake pulsation. The intake efficiency will be improved.
なお、例えば前記ダイヤフラム６の材料を鉄板とし、
半径が150mm,板厚2.0mmとすると、共振周波数ｆは以下
の近似式で求めることができる。In addition, for example, the material of the diaphragm 6 is an iron plate,
If the radius is 150 mm and the plate thickness is 2.0 mm, the resonance frequency f can be obtained by the following approximate expression.
但しＤ＝曲げ剛性 Ｒ＝半径＝150mm ｈ＝板厚＝2.0mm ρ＝密度＝0.785×10-2kg/cm3 Ｅ＝ヤング率＝21000kg/mm2 μ＝ポアソン比＝0.3 以上の条件によって、計算し、解を求めると周波数ｆ
＝34Hzとなる。すなわちエンジンの回転数2000r.p.mで
前記ダイヤフラムは共振し、吸入効率が高められること
になる。 Where D = bending stiffness R = radius = 150 mm h = plate thickness = 2.0 mm ρ = density = 0.785 × 10 -2 kg / cm 3 E = Young's modulus = 21000 kg / mm 2 μ = Poisson's ratio = 0.3 After calculating and finding the solution, the frequency f
= 34 Hz. That is, the diaphragm resonates at an engine speed of 2000 rpm, and the suction efficiency is increased.
但し、以上の計算例は一例であって、ダイヤフラム６
の径や、厚み，材質を、要求される回転数領域に合わせ
て自在に設定できることは勿論である。However, the above calculation example is an example, and the diaphragm 6
Of course, the diameter, thickness, and material of the can be freely set in accordance with the required rotational speed range.
また、これと併せて前記アクチュエータにより固有振
動数を変化させることで、該当する回転領域以外での吸
気効率も高めることができる。In addition, by changing the natural frequency by the actuator together with this, the intake efficiency in a region other than the corresponding rotation region can be increased.
《発明の効果》 以上実施例によって詳細に説明したように、この発明
による内燃機関の吸気構造にあっては、吸入空気の脈動
の周波数と、ダイヤフラムの固有振動が一致すること
で、吸気負圧を増大すべくダイヤフラムが振動し、吸入
効果を高めることができる。<< Effects of the Invention >> As described above in detail with the embodiment, in the intake structure of the internal combustion engine according to the present invention, the intake air pulsation frequency matches the natural vibration of the diaphragm, thereby reducing the intake negative pressure. The diaphragm vibrates in order to increase the pressure, and the suction effect can be enhanced.
また、前述の作用をなすダイヤフラムを含む制御手段
をエアクリーナのカバーに設けることで、既存の吸気構
造物の大幅な改変を伴うことなく実施ができる。In addition, by providing the control means including the diaphragm having the above-described action on the cover of the air cleaner, the present invention can be carried out without significant modification of the existing intake structure.
さらに制振手段を設けることで、機関の回転数変化に
追随させてダイヤフラムを振動させることができ、特定
の回転数領域以外での吸入効果も高めることができる。Further, by providing the vibration damping means, the diaphragm can be vibrated in accordance with the change in the engine speed, and the suction effect in a region other than the specific engine speed region can be enhanced.
第１図はこの発明を適用したエアクリーナおよびその制
御系統を示す説明図である。 １……エアクリーナ（吸気系構造物） ２……エンジン ４……カバー ６……ダイヤフラム ７……アクチュエータ（制振手段） ８……回転計（回転数検出手段） ９……制御部（制御手段）FIG. 1 is an explanatory diagram showing an air cleaner to which the present invention is applied and a control system thereof. DESCRIPTION OF SYMBOLS 1 ... Air cleaner (intake system structure) 2 ... Engine 4 ... Cover 6 ... Diaphragm 7 ... Actuator (vibration suppression means) 8 ... Tachometer (rotation speed detection means) 9 ... Control part (control means) )
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) F02B 27/00 - 27/02 F02B 29/02 F02M 35/024──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) F02B 27/00-27/02 F02B 29/02 F02M 35/024
Claims (1)
されたダイヤフラムと、このダイヤフラムの固有振動数
を変化させるため前記カバーに設けられてダイヤフラム
の張力を調整する制振手段と、内燃機関の回転数を検知
する検知手段と、この検知手段の検知出力に応じて前記
制振手段を作動させるための制御手段とを備え、ダイヤ
フラムを吸気脈動に応じて振動させるようにしたことを
特徴とする内燃機関の吸気構造。1. A diaphragm provided in a hole formed in a cover of an air cleaner, vibration-suppressing means provided on the cover for changing the natural frequency of the diaphragm and adjusting the tension of the diaphragm, and an internal combustion engine. A detecting means for detecting the number of revolutions, and a control means for operating the vibration damping means in accordance with a detection output of the detecting means, wherein the diaphragm is vibrated in response to the intake pulsation. The intake structure of an internal combustion engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32133189A JP2832050B2 (en) | 1989-12-13 | 1989-12-13 | Intake structure of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32133189A JP2832050B2 (en) | 1989-12-13 | 1989-12-13 | Intake structure of internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03182624A JPH03182624A (en) | 1991-08-08 |
| JP2832050B2 true JP2832050B2 (en) | 1998-12-02 |
Family
ID=18131399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32133189A Expired - Lifetime JP2832050B2 (en) | 1989-12-13 | 1989-12-13 | Intake structure of internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2832050B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4523536B2 (en) * | 2005-10-28 | 2010-08-11 | 本田技研工業株式会社 | Vehicle air cleaner structure |
-
1989
- 1989-12-13 JP JP32133189A patent/JP2832050B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03182624A (en) | 1991-08-08 |
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