JP2549383B2 - Engine intake system - Google Patents
Engine intake systemInfo
- Publication number
- JP2549383B2 JP2549383B2 JP62160723A JP16072387A JP2549383B2 JP 2549383 B2 JP2549383 B2 JP 2549383B2 JP 62160723 A JP62160723 A JP 62160723A JP 16072387 A JP16072387 A JP 16072387A JP 2549383 B2 JP2549383 B2 JP 2549383B2
- Authority
- JP
- Japan
- Prior art keywords
- intake
- intake passage
- passage
- common
- 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 - Fee Related
Links
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は吸気通路に拡大室を設けたエンジンの吸気装
置に関するものである。TECHNICAL FIELD The present invention relates to an intake system for an engine having an expansion chamber provided in an intake passage.
（従来技術） 従来から、吸気の共鳴効果をもたせるための拡大室
（レゾネータ）を吸気通路に連通路を介して接続し（実
開昭59−68130号公報参照）、若しくは拡大室を直接吸
気通路に介設し、拡大室で反射される吸気圧力波により
エンジンの充填効率の向上を図るようにしたエンジンの
吸気装置は一般に知られている。(Prior Art) Conventionally, an expansion chamber (resonator) for providing an intake resonance effect is connected to an intake passage via a communication passage (see Japanese Utility Model Laid-Open No. 59-68130) or the expansion chamber is directly connected to the intake passage. There is generally known an intake system for an engine, which is installed in the engine and is designed to improve the charging efficiency of the engine by the intake pressure wave reflected in the expansion chamber.
ところで、この種の装置において、共鳴効果を高める
ためには、吸気通路断面積をある程度小さくして上記拡
大室に伝わる圧力波の減衰を小さくすることが望ましい
が、このようにすると、拡大室より上流側にも比較的大
きな圧力波が伝わることにより、吸気音が大きくなった
り、エアフローメータが設けられている場合はその検出
精度が低下したりするという問題が生じる。このような
問題を避けるために従来は、吸気通路断面積をかなり大
きくしており、このため、拡大室に伝わる圧力波が減衰
して充分な共鳴効果が得られていなかった。By the way, in this type of device, in order to enhance the resonance effect, it is desirable to reduce the cross-sectional area of the intake passage to some extent to reduce the attenuation of the pressure wave transmitted to the expansion chamber. Since a relatively large pressure wave is transmitted to the upstream side as well, there arises a problem that the intake noise becomes loud and the detection accuracy of the air flow meter is lowered when the air flow meter is provided. In order to avoid such a problem, conventionally, the cross-sectional area of the intake passage is made considerably large. Therefore, the pressure wave transmitted to the expansion chamber is attenuated and a sufficient resonance effect is not obtained.
（発明の目的） 本発明は上記の事情に鑑み、拡大室に伝わる圧力波の
減衰を小さくして共鳴効果を高め、しかも、吸気音の増
大等の弊害を防止することができるエンジンの吸気装置
を提供するものである。(Object of the Invention) In view of the above circumstances, the present invention is an intake device for an engine that can reduce the attenuation of the pressure wave transmitted to the expansion chamber to enhance the resonance effect and prevent the adverse effects such as an increase in intake noise. Is provided.
（発明の構成） 本発明は、エンジン本体の各気筒に吸気を供給する各
気筒別吸気通路と、該各気筒別吸気通路の上流端側に接
続されて、大気側から導入した吸気を各気筒別吸気通路
に送る共通吸気通路とを備え、該共通吸気通路に連通路
を介し若しくは直接に拡大室を設けたエンジンの吸気装
置において、上記各気筒に燃料を供給する燃料噴射弁を
設けるとともに、該燃料噴射弁からの燃料噴射量を制御
するために吸気の吸入状態を検出する検出手段を上記共
通吸気通路の途中に設け、該検出手段より下流の共通吸
気通路に断面積が変化する部分を設けて、この部分より
下流側が上流側と比べて小さい断面積となるように共通
吸気通路を形成し、該共通吸気通路の断面積が小さい下
流側部分に上記拡大室を連通させたこものである。(Structure of the Invention) The present invention is directed to an intake passage for each cylinder that supplies intake air to each cylinder of an engine body, and an intake passage introduced from the atmosphere side connected to the upstream end side of the intake passage for each cylinder. In an intake system of an engine, which is provided with a common intake passage for sending to another intake passage, and which is provided with an expansion chamber directly or through a communication passage in the common intake passage, with a fuel injection valve for supplying fuel to each of the cylinders, Detecting means for detecting the intake state of intake air for controlling the amount of fuel injected from the fuel injection valve is provided in the middle of the common intake passage, and a portion whose cross-sectional area changes in the common intake passage downstream of the detecting means. The common intake passage is formed so that the downstream side of this portion has a smaller cross-sectional area than the upstream side, and the expansion chamber is connected to the downstream side portion of the common intake passage having a small cross-sectional area. .
この吸気装置によると、共通吸気通路の下流側の、断
面積が小さくされている部分に上記拡大室が連通されて
いることにより、上記拡大室へ伝播される圧力波の減衰
が少なくなって、共鳴効果が高められる。しかも、上記
検出手段が設けられている共通吸気通路の上流側は下流
側と比べて断面積が大きく形成されていることにより、
この共通吸気通路上流側では圧力波が減衰され、検出手
段の誤動作を防止するとともに吸気音を低減する作用が
得られる。According to this intake device, since the expansion chamber is communicated with the portion of the downstream side of the common intake passage where the cross-sectional area is reduced, the attenuation of the pressure wave propagated to the expansion chamber is reduced, The resonance effect is enhanced. Moreover, since the upstream side of the common intake passage in which the detection means is provided has a larger cross-sectional area than the downstream side,
The pressure wave is attenuated on the upstream side of the common intake passage, so that the malfunction of the detection means can be prevented and the intake noise can be reduced.
（実施例） 第１図は本発明の第１実施例を示し、この図におい
て、１はエンジン本体、２はエンジン本体に配設された
気筒、３は吸気通路である。上記吸気通路３は、各気筒
の燃焼室に開口した吸気ポート４に通じる気筒別吸気通
路５と、この各気筒別吸気通路５の上流端側に接続され
て、大気側から導入した吸気を各気筒別吸気通路５に送
る共通吸気通路６とを備え、共通吸気通路６に吸気レゾ
ネータ７が設けられ、当実施例では連通路８を介して吸
気レゾネータ（拡大室）７が共通吸気通路６に接続され
ている。各気筒別吸気通路５には燃料噴射弁９が装備さ
れており、また、共通吸気通路６には、その適宜箇所に
スロットル弁10が装備されるとともに、上流側に、エア
クリーナ11と、燃料噴射量の制御のために吸気の吸入状
態を検出する検出手段としてのエアフローメータ12とが
装備されている。上記エアフローメータ12は、共通吸気
通路６を通る吸気の流量を検出するものである。(Embodiment) FIG. 1 shows a first embodiment of the present invention, in which 1 is an engine body, 2 is a cylinder arranged in the engine body, and 3 is an intake passage. The intake passage 3 is connected to an intake passage 5 for each cylinder communicating with an intake port 4 opening to the combustion chamber of each cylinder, and an upstream end side of the intake passage 5 for each cylinder, so that intake air introduced from the atmosphere side is introduced into each intake passage 3. A common intake passage 6 for sending to the cylinder-specific intake passage 5 is provided, and an intake resonator 7 is provided in the common intake passage 6, and in this embodiment, the intake resonator (expansion chamber) 7 is provided in the common intake passage 6 via the communication passage 8. It is connected. Each cylinder intake passage 5 is equipped with a fuel injection valve 9, and the common intake passage 6 is equipped with a throttle valve 10 at an appropriate position, and an air cleaner 11 and a fuel injection valve are provided upstream. An air flow meter 12 as a detecting means for detecting the intake state of the intake air for controlling the amount is provided. The air flow meter 12 detects the flow rate of intake air passing through the common intake passage 6.
上記共通吸気通路６は、その途中箇所6aで吸気通路断
面積が変化して、これより上流側の、エアクリーナ11お
よびエアフローメータ12が配置されている部分6bの吸気
通路断面積D1が比較的大きくなり、下流側の部分6cの吸
気通路断面積D2が上流側と比べて小さくなるように形成
されている。そして、この共通吸気通路６下流側の吸気
通路断面積D2が小さくなっている部分6cに、上記吸気レ
ゾネータ７が接続されている。なお、吸気レゾネータ７
より下流の吸気通路長さは充填効率の向上を図ろうとす
るエンジン回転数域に応じて予め設定しておけばよい。
また、異なる回転数域でそれぞれ共鳴効果をもたせるた
め、図に実線と二点鎖線とで示すように吸気通路の複数
箇所に吸気レゾネータ7,7′を設け、その一方（下流
側）の吸気レゾネータ７′と共通吸気通路６との間の連
通路８′に開閉弁13を設け、エンジン回転数に応じて上
記開閉弁13を開閉作動させるようにしてもよい。このよ
うにする場合も、各吸気レゾネータ7,7′をいずれも共
通吸気通路の小さな吸気通路断面積D2の部分6cに接続し
ておく。The intake passage cross-sectional area of the common intake passage 6 changes at a midpoint 6a, and the intake passage cross-sectional area D 1 of a portion 6b on the upstream side where the air cleaner 11 and the air flow meter 12 are arranged is relatively large. The intake passage cross-sectional area D 2 of the downstream side portion 6c becomes larger than that of the upstream side portion 6c. The intake resonator 7 is connected to the portion 6c on the downstream side of the common intake passage 6 where the intake passage cross-sectional area D 2 is small. The intake resonator 7
The intake passage length on the further downstream side may be set in advance according to the engine speed range in which the charging efficiency is to be improved.
In addition, in order to have resonance effects in different rotational speed regions, the intake resonators 7 and 7'are provided at a plurality of positions in the intake passage as shown by the solid line and the chain double-dashed line in the figure, and one (downstream) intake resonator is provided. An opening / closing valve 13 may be provided in the communication passage 8'between the 7'and the common intake passage 6, and the opening / closing valve 13 may be opened / closed according to the engine speed. Also in this case, each of the intake resonators 7 and 7'is connected to the portion 6c of the small intake passage sectional area D 2 of the common intake passage.
以上のような当実施例の吸気装置によると、吸気レゾ
ネータ７で反射する吸気圧力波の振動がエンジン回転数
と同調する回転数域で、従来から知られている共鳴効果
により吸気の充填効率が高められる。この場合に、吸気
レゾネータ７が設けられている共通吸気通路６下流側の
部分6cの吸気通路断面積D2が小さくされていることによ
り、この部分6cを通って吸気レゾネータ７に到達する吸
気圧力波の振幅が大きくなり、共鳴効果が高められる。
また、吸気レゾネータ７より上流側に伝わる吸気圧力波
は、共通吸気通路６上流側の部分6bの吸気通路断面積D1
が大きくなっていることによって充分に減衰され、吸気
振動によるエアフローメータ12の誤動作が防止されると
ともに吸気通路上流端側における吸気音が低減されるこ
ととなる。According to the intake system of the present embodiment as described above, in the rotational speed range where the vibration of the intake pressure wave reflected by the intake resonator 7 is synchronized with the engine rotational speed, the charging efficiency of the intake air is improved by the conventionally known resonance effect. To be enhanced. In this case, since the intake passage sectional area D 2 of the portion 6c on the downstream side of the common intake passage 6 in which the intake resonator 7 is provided is made small, the intake pressure reaching the intake resonator 7 through this portion 6c. The amplitude of the wave is increased and the resonance effect is enhanced.
Further, the intake pressure wave transmitted to the upstream side from the intake resonator 7 is the intake passage cross-sectional area D 1 of the portion 6b on the upstream side of the common intake passage 6.
Is sufficiently attenuated to prevent malfunction of the air flow meter 12 due to intake vibration, and intake noise on the upstream end side of the intake passage is reduced.
第２図は本発明の第２実施例を示し、この実施例で
は、各気筒別吸気通路５の集合部分にサージタンク14が
設けられ、このサージタンク14に共通吸気通路６が接続
されている。また、共通吸気通路６には、吸気レゾネー
タ７が直接に介設されている。この場合も、エアクリー
ナ11およびエアフローメータ12が配置されている共通吸
気通路６上流側の部分6bの吸気通路断面積D1が比較的大
きくされ、共通吸気通路６の途中箇所6aで通路断面積が
変化して、ここからサージタンク14までの部分6cの吸気
通路断面積D2が小さくされるとともに、この部分6cに吸
気レゾネータ７が設けられている。FIG. 2 shows a second embodiment of the present invention. In this embodiment, a surge tank 14 is provided at the gathering portion of the intake passages 5 for each cylinder, and a common intake passage 6 is connected to this surge tank 14. . An intake resonator 7 is directly provided in the common intake passage 6. Also in this case, the intake passage sectional area D 1 of the portion 6b on the upstream side of the common intake passage 6 in which the air cleaner 11 and the air flow meter 12 are arranged is made relatively large, and the passage sectional area at the midpoint 6a of the common intake passage 6 becomes large. By changing, the intake passage cross-sectional area D 2 of the portion 6c from here to the surge tank 14 is reduced, and the intake resonator 7 is provided in this portion 6c.
この構造によっても、吸気圧力波は小さな吸気通路断
面積D2の部分6cを通って吸気レゾネータ７に伝わるた
め、吸気レゾネータ７で反射される圧力波の振幅が大き
くなって共鳴効果が高められる一方、吸気圧力波の一部
が吸気レゾネータ７を通過して上流側に伝播しても、上
流側では圧力波が充分に減衰されることとなり、第１実
施例と同様の作用が得られる。Also with this structure, the intake pressure wave is transmitted to the intake resonator 7 through the portion 6c having the small intake passage cross-sectional area D 2 , so that the amplitude of the pressure wave reflected by the intake resonator 7 is increased and the resonance effect is enhanced. Even if a part of the intake pressure wave passes through the intake resonator 7 and propagates to the upstream side, the pressure wave is sufficiently attenuated on the upstream side, and the same operation as in the first embodiment can be obtained.
（発明の効果） 以上のように本発明は、燃料噴射量の制御のために吸
気の吸入状態を検出する検出手段を共通吸気通路の途中
に設け、該検出手段より下流で共通吸気通路の断面積を
下流側が上流側より小さくなるように変化させ、その吸
気通路断面積が小さくされた部分に吸気レゾネータを設
けているため、吸気通路上流側では圧力波を減衰させて
吸気音の低減及び上記検出手段の誤動作の防止を図りつ
つ、吸気レゾネータには大きな振幅の圧力波を到達させ
て共鳴効果を高め、充填効率を向上することができるも
のである。(Effects of the Invention) As described above, according to the present invention, the detection means for detecting the intake state of intake air for controlling the fuel injection amount is provided in the middle of the common intake passage, and the common intake passage is disconnected downstream of the detection means. The area is changed so that the downstream side is smaller than the upstream side, and the intake resonator is provided in the portion where the cross-sectional area of the intake passage is reduced.Therefore, pressure waves are attenuated on the upstream side of the intake passage to reduce intake noise and While preventing the malfunction of the detection means, a pressure wave with a large amplitude can reach the intake resonator to enhance the resonance effect and improve the filling efficiency.
第１図は本発明の第１実施例を示す概略平面図、第２図
は第２実施例を示す概略平面図である。 １……エンジン本体、３……吸気通路、6a……吸気通路
断面積が変化する箇所、6a……吸気通路断面積が大きい
部分、6c……吸気通路断面積が小さい部分、７……吸気
レゾネータ。FIG. 1 is a schematic plan view showing a first embodiment of the present invention, and FIG. 2 is a schematic plan view showing a second embodiment. 1 ... Engine body, 3 ... Intake passage, 6a ... Location where intake passage cross-sectional area changes, 6a ... Area with large intake passage cross-section, 6c ... Area with small intake passage cross-section, 7 ... Intake Resonator.
Claims (3)
気筒別吸気通路と、該各気筒別吸気通路の上流端側に接
続されて、大気側から導入した吸気を各気筒別吸気通路
に送る共通吸気通路とを備え、該共通吸気通路に連通路
を介し若しくは直接に拡大室を設けたエンジンの吸気装
置において、上記各気筒に燃料を供給する燃料噴射弁を
設けるとともに、該燃料噴射弁からの燃料噴射量を制御
するために吸気の吸入状態を検出する検出手段を上記共
通吸気通路の途中に設け、該検出手段より下流の共通吸
気通路に断面積が変化する部分を設けて、この部分より
下流側が上流側と比べて小さい断面積となるように共通
吸気通路を形成し、該共通吸気通路の断面積が小さい下
流側部分に上記拡大室を連通させたことを特徴とするエ
ンジンの吸気装置。1. An intake passage for each cylinder for supplying intake air to each cylinder of an engine body, and an intake passage introduced from the atmosphere side connected to the upstream end side of the intake passage for each cylinder to the intake passage for each cylinder. A common fuel intake valve for supplying fuel to each of the cylinders in an intake system of an engine having a common intake passage for sending, and an expansion chamber provided directly or through a communication passage in the common intake passage. Detection means for detecting the intake state of the intake air for controlling the fuel injection amount from the intake air is provided in the middle of the common intake passage, and a portion of which the cross-sectional area changes is provided in the common intake passage downstream of the detection means. A common intake passage is formed so that the downstream side of the portion has a smaller cross-sectional area than the upstream side, and the expansion chamber communicates with the downstream side portion of the common intake passage having a small cross-sectional area. Intake device
吸気装置において、上記検出手段としてエアフローメー
タを設けたことを特徴とするエンジンの吸気装置。2. An engine intake system according to claim 1, wherein an air flow meter is provided as the detecting means.
吸気装置において、上記拡大室を連通路を介して共通吸
気通路に連通させ、該連通路に開閉弁を設けたことを特
徴とするエンジンの吸気装置。3. The engine intake system according to claim 1, wherein the expansion chamber is connected to a common intake passage through a communication passage, and an opening / closing valve is provided in the communication passage. Intake device for the engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62160723A JP2549383B2 (en) | 1987-06-26 | 1987-06-26 | Engine intake system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62160723A JP2549383B2 (en) | 1987-06-26 | 1987-06-26 | Engine intake system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS648316A JPS648316A (en) | 1989-01-12 |
| JP2549383B2 true JP2549383B2 (en) | 1996-10-30 |
Family
ID=15721071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62160723A Expired - Fee Related JP2549383B2 (en) | 1987-06-26 | 1987-06-26 | Engine intake system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2549383B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3034258B2 (en) * | 1989-01-24 | 2000-04-17 | マツダ株式会社 | Engine intake silencer |
| US5572966A (en) * | 1994-09-30 | 1996-11-12 | Siemens Electric Limited | Method and composite resonator for tuning an engine air induction system |
| JP5995632B2 (en) * | 2012-09-28 | 2016-09-21 | ダイハツ工業株式会社 | Intake passage of internal combustion engine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56105623U (en) * | 1980-01-16 | 1981-08-18 | ||
| JPS581765U (en) * | 1981-06-26 | 1983-01-07 | 本田技研工業株式会社 | Engine intake noise muffling device |
-
1987
- 1987-06-26 JP JP62160723A patent/JP2549383B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS648316A (en) | 1989-01-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |