JPH0814050A - Intake device for three-cylinder internal combustion engine - Google Patents
Intake device for three-cylinder internal combustion engineInfo
- Publication number
- JPH0814050A JPH0814050A JP6146448A JP14644894A JPH0814050A JP H0814050 A JPH0814050 A JP H0814050A JP 6146448 A JP6146448 A JP 6146448A JP 14644894 A JP14644894 A JP 14644894A JP H0814050 A JPH0814050 A JP H0814050A
- Authority
- JP
- Japan
- Prior art keywords
- intake
- internal combustion
- combustion engine
- pipe
- switching valve
- 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.)
- Pending
Links
Classifications
-
- 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
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Characterised By The Charging Evacuation (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は，吸気脈動を利用して吸
気効率を向上させる内燃機関の吸気装置に係り，特に３
気筒内燃機関に好適な吸気装置の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake system for an internal combustion engine which utilizes intake pulsation to improve intake efficiency, and more particularly to 3
The present invention relates to an improvement of an intake device suitable for a cylinder internal combustion engine.
【０００２】[0002]
【従来の技術】一般に，内燃機関の吸気装置において
は，吸気系内部を伝搬する圧力波の脈動を利用して吸気
体積効率を向上させる慣性過給効果を発揮させることが
できる。内燃機関では運転状態に応じて吸気系を伝搬す
る圧力波の速度が変化する。従って，上記慣性過給効果
を利用して広い運転範囲にわたって吸気効率を向上させ
るには，吸気経路の長さや体積を切替調整して，吸気系
の固有振動数を最適値に可変制御することが有効であ
る。例えば，特開昭６０−１６４６１９号には，４気筒
内燃機関の吸気装置においいて，４本の吸気管の上流側
端部をサージタンクに連通し，該サージタンクより下流
側に各吸気管を連通する連通部を形成し，該連通部に切
替バルブを設けた可変吸気装置が開示されている。この
従来例では，上記切替バルブを開閉制御することにより
吸気管の等価管長を内燃機関の運転状態に応じて可変制
御することができる。2. Description of the Related Art Generally, in an intake system for an internal combustion engine, an inertia supercharging effect for improving intake volume efficiency can be exhibited by utilizing pulsation of a pressure wave propagating inside an intake system. In the internal combustion engine, the speed of the pressure wave propagating through the intake system changes according to the operating state. Therefore, in order to improve the intake efficiency over a wide operating range by utilizing the above-mentioned inertial supercharging effect, it is possible to variably control the natural frequency of the intake system to the optimum value by switching and adjusting the length and volume of the intake path. It is valid. For example, Japanese Patent Laid-Open No. 60-164619 discloses an intake system for a four-cylinder internal combustion engine in which the upstream ends of four intake pipes are connected to a surge tank, and each intake pipe is provided downstream of the surge tank. A variable intake device is disclosed in which a communicating portion that communicates is formed and a switching valve is provided in the communicating portion. In this conventional example, the equivalent pipe length of the intake pipe can be variably controlled according to the operating state of the internal combustion engine by controlling the opening / closing of the switching valve.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら，上記従
来例では，４本の吸気管を有する４気筒内燃機関の可変
吸気装置が開示されているだけで，機関の低速，中速，
高速の速度段階に応じて最適の吸気量を確保する構成と
はなっていない。本発明は，このような従来の技術にお
ける課題を解決するために，３本の吸気管を有する３気
筒内燃機関の各吸気管の等価管長を機関速度に応じて適
正に可変制御できる３気筒内燃機関の吸気装置を提供す
ることを目的とするものである。However, in the above-mentioned conventional example, only the variable intake system for a four-cylinder internal combustion engine having four intake pipes is disclosed.
It is not configured to secure the optimum intake amount according to the high speed stage. In order to solve the problems in the prior art, the present invention is a three-cylinder internal combustion engine capable of appropriately variably controlling the equivalent pipe length of each intake pipe of a three-cylinder internal combustion engine having three intake pipes according to the engine speed. An object is to provide an intake device for an engine.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
に本発明は，一端が第１の連通部で連通し，他端が分岐
して３気筒内燃機関の各気筒にそれぞれ接続されてなる
３本の吸気管が，上記一端と他端との間で第２の連通部
により相互に連通され，上記第２の連通部に該第２の連
通部を開閉制御する第１の切替バルブが設けられてなる
３気筒内燃機関の吸気装置において，上記吸気管の少な
くともいずれか１本の上記第２の連通部より吸気方向上
流部に，該吸気管を開閉制御する第２の切替バルブを設
けたことを特徴とする３気筒内燃機関の吸気装置であ
る。In order to achieve the above object, the present invention is configured such that one end communicates with a first communicating portion and the other end branches and is connected to each cylinder of a three-cylinder internal combustion engine. The three intake pipes are communicated with each other by the second communicating portion between the one end and the other end, and the second communicating portion is provided with a first switching valve that controls opening and closing of the second communicating portion. In an intake system for a three-cylinder internal combustion engine provided, a second switching valve for controlling opening / closing of the intake pipe is provided upstream of at least one of the second communication parts of the intake pipe in the intake direction. This is an intake device for a three-cylinder internal combustion engine.
【０００５】[0005]
【作用】本発明によれば，内燃機関の低速域において，
第１の切替バルブを閉弁して各吸気管を分離させると共
に，第２の切替バルブを開弁して，各吸気管を全長にわ
たってほぼ同断面積で独立した吸気管として，長い等価
管長の吸気系により吸気を流通させる。中速域では，第
１の切替バルブを開弁し，第２の切替バルブを閉弁し
て，第２の連通部より上流側では，２本の吸気管の合計
管断面積を通じて吸気を流通させ，吸気系の等価管長を
上記低速時より短縮する。高速域では，第１，第２両切
替バルブを開弁し，第２の連通部より上流側では，３本
の吸気管の合計管断面積を通じて吸気を流通させ，吸気
系の等価管長を中速時より更に短縮する。このように両
切替バルブを開閉することにより，第２連通部より上流
側の吸気管の合計管断面積を機関速度に応じて可変制御
して，吸気系の等価管長を内燃機関の運転状態に応じて
可変制御することができる。According to the present invention, in the low speed range of the internal combustion engine,
The first switching valve is closed to separate each intake pipe, and the second switching valve is opened to make each intake pipe an independent intake pipe with a substantially same cross-sectional area over the entire length, so that a long equivalent pipe length is obtained. Intake air is distributed by the system. In the medium speed range, the first switching valve is opened, the second switching valve is closed, and the intake air flows through the total cross-sectional area of the two intake pipes on the upstream side of the second communication part. Then, the equivalent pipe length of the intake system is shortened compared to the above low speed. In the high speed range, the first and second switching valves are opened, and the intake air is circulated through the total cross-sectional area of the three intake pipes on the upstream side of the second communication part, so that the equivalent pipe length of the intake system is Shorter than at high speed. By opening and closing both switching valves in this way, the total pipe cross-sectional area of the intake pipe upstream of the second communicating portion is variably controlled according to the engine speed, and the equivalent pipe length of the intake system is set to the operating state of the internal combustion engine. It can be variably controlled accordingly.
【０００６】[0006]
【実施例】以下，添付図面を参照して本発明を具体化し
た実施例につき説明し，本発明の理解に供する。尚，以
下の実施例は，本発明を具体化した一例であって，本発
明の技術的範囲を限定する性格のものではない。ここ
に，図１は内燃機関の低速運転域での吸気装置の構成
図，図２は中速運転域での吸気装置の構成図，図３は高
速運転域での吸気装置の構成図である。まず，本発明の
一実施例にかかる３気筒内燃機関の吸気装置を説明す
る。例えば図１において，機関本体１０には，＃１，＃
２，＃３の各気筒１１が設けられており，各気筒１１に
は，それぞれ吸気管２１，２２，２３が連通している。
各吸気管２１〜２３の吸気上流側端部は，連通部２４
（第１の連通部）で連通している。連通部２４の更に上
流側には，スロットル２０が連通している。各吸気管２
１〜２３の中間部には，各吸気管２１〜２３を連通させ
る連通部２５（第２の連通部）が形成されている。該連
通部２５の位置は，各吸気管２１〜２３の全長をＬ，上
記各気筒１１から連通部２５までの長さをＬ１，連通部
２５から上記連通部２４までの長さをＬ２とすると， Ｌ＝Ｌ1 ＋Ｌ2 ，Ｌ1 ＜Ｌ2 に設定されている。Embodiments of the present invention will be described below with reference to the accompanying drawings for the understanding of the present invention. The following embodiments are examples of embodying the present invention and are not intended to limit the technical scope of the present invention. 1 is a block diagram of the intake device in the low speed operation range of the internal combustion engine, FIG. 2 is a configuration diagram of the intake device in the medium speed operation range, and FIG. 3 is a block diagram of the intake device in the high speed operation range. . First, an intake system for a three-cylinder internal combustion engine according to an embodiment of the present invention will be described. For example, in FIG. 1, the engine body 10 has # 1, #
2 and # 3 cylinders 11 are provided, and intake pipes 21, 22, and 23 are in communication with each cylinder 11.
The intake upstream side ends of the intake pipes 21 to 23 are connected to the communication part 24.
(First communication part) communicates with each other. The throttle 20 communicates with the upstream side of the communication portion 24. Each intake pipe 2
A communication portion 25 (second communication portion) that communicates the intake pipes 21 to 23 is formed in an intermediate portion of 1 to 23. The position of the communicating portion 25 is such that the total length of each intake pipe 21 to 23 is L, the length from each cylinder 11 to the communicating portion 25 is L1, and the length from the communicating portion 25 to the communicating portion 24 is L2. , L = L1 + L2, L1 <L2.
【０００７】上記連通部２５内には，各吸気管２１〜２
３間で開閉自在な２個の切替バルブ３０，３０（第１の
切替バルブ）が設けられている。両切替バルブ３０，３
０は，常に一致して開閉動作するようになっている。そ
して，上記＃３の気筒１１に連通した吸気管２３の連通
部２５より上流側には，吸気管２３を開閉自在な切替バ
ルブ３１（第２の切替バルブ）が設けられている。以上
のような構成の一実施例では，まず低速域において，図
１に示すように，切替バルブ３０，３０を閉弁して各吸
気管２１，２２，２３の連通を断ち，切替バルブ３１を
開弁する。この状態では，各吸気管２１〜２３が長さＬ
の全長にわたって，同一の管断面積で各々独立して吸気
が流通し，吸気系の等価管長が長くなり，低速域での慣
性過給効果が促進され，吸気効率が向上する。 次に，
図２に示す中速域では，切替バルブ３０，３０を開弁
し，切替バルブ３１を閉弁する。この状態では，各気筒
１１の吸気工程において，各吸気管２１〜２３は，長さ
Ｌ1 の範囲では，それぞれ独立している。一方，連通部
２５より上流側の長さＬ2 の範囲では，切替バルブ３
０，３０が開弁し，切替バルブ３１が閉弁しているため
に，吸気管２１，２２の合計管断面積を通った吸気が，
連通部２５を経て，長さＬ1 の範囲の各吸気管２１〜２
３に順次流通する。したがって，長さＬ2 の範囲では，
２本の吸気管２１，２２の合計管断面積を吸気が流通
し，等価管長が上記低速域より短縮される。このため，
中速域の運転状態に適合した吸気脈動が発生し，中速域
での慣性過給による吸気効率が向上する。In the communication section 25, the intake pipes 21 to 2 are provided.
Two switching valves 30, 30 (first switching valve) which can be opened and closed between 3 are provided. Both switching valves 30, 3
0 always opens and closes in coincidence. A switching valve 31 (second switching valve) that can open and close the intake pipe 23 is provided upstream of the communication portion 25 of the intake pipe 23 that communicates with the # 3 cylinder 11. In one embodiment of the above-described structure, first, in the low speed region, as shown in FIG. 1, the switching valves 30, 30 are closed to disconnect the intake pipes 21, 22, 23 from each other, and the switching valve 31 is opened. Open the valve. In this state, each of the intake pipes 21 to 23 has a length L
Intake is independently distributed over the entire length of the pipe with the same cross-sectional area, the equivalent pipe length of the intake system is lengthened, the inertia supercharging effect in the low speed region is promoted, and the intake efficiency is improved. next,
In the medium speed range shown in FIG. 2, the switching valves 30 and 30 are opened and the switching valve 31 is closed. In this state, in the intake stroke of each cylinder 11, the intake pipes 21 to 23 are independent within the range of the length L1. On the other hand, in the range of the length L2 on the upstream side of the communicating portion 25, the switching valve 3
Since 0 and 30 are open and the switching valve 31 is closed, the intake air that has passed through the total cross-sectional area of the intake pipes 21 and 22 is
Each of the intake pipes 21 to 2 in the range of the length L1 passes through the communication portion 25.
3 will be distributed in sequence. Therefore, in the range of length L2,
The intake air flows through the total pipe cross-sectional area of the two intake pipes 21 and 22, and the equivalent pipe length is shortened from the above low speed range. For this reason,
Intake pulsation that matches the operating conditions in the medium speed range occurs, and intake efficiency improves due to inertial supercharging in the medium speed range.
【０００８】最後に，図３に示す高速域では，切替バル
ブ３０，３０を開弁し，切替バルブ３１を開弁する。こ
の状態では，各気筒１１の吸気工程において，各吸気管
２１〜２３は，長さＬ1の範囲では，それぞれ独立して
いる。一方，連通部２５より上流側の長さＬ2 の範囲で
は，切替バルブ３０，３０および切替バルブ３１が開弁
しているために，全吸気管２１，２２，２３の合計管断
面積を通った吸気が，連通部２５を経て，長さＬ1 の範
囲の各吸気管２１〜２３に順次流通する。したがって，
長さＬ2 の範囲では，３本の吸気管２１，２２，２３の
合計管断面積を吸気が流通し，等価管長が上記中速域よ
り更に短縮される。このため，高速域の運転状態に適合
した吸気脈動が発生し，高速域での慣性過給による吸気
効率が向上する。上記したように切替バルブ３０，３０
および３１を開閉制御することにより，各吸気管２１〜
２３の等価管長が，低速域・中速域・高速域に適した３
ステージに可変制御され，内燃機関１０の全運転域にわ
たって，吸気効率が向上し，内燃機関１０の出力および
トルクが増大し，トルク特性がフラットになる。なお，
本発明は以上の一実施例に限定されず，種々変形可能で
ある。上記実施例では，連通部２５の位置をＬ1 ＜Ｌ2
となるように設定したが，吸気系の要求特性に応じて，
Ｌ1 ＝Ｌ2 でもよく，逆にＬ1 ＞Ｌ2 とすることもでき
る。Finally, in the high speed range shown in FIG. 3, the switching valves 30, 30 are opened and the switching valve 31 is opened. In this state, in the intake stroke of each cylinder 11, the intake pipes 21 to 23 are independent within the range of the length L1. On the other hand, in the range of the length L2 on the upstream side of the communication portion 25, since the switching valves 30, 30 and the switching valve 31 are open, the total pipe cross-sectional area of all the intake pipes 21, 22, 23 has passed. The intake air passes through the communication portion 25 and sequentially flows through the intake pipes 21 to 23 in the range of the length L1. Therefore,
In the range of the length L2, the intake air flows through the total pipe cross-sectional area of the three intake pipes 21, 22, 23, and the equivalent pipe length is further shortened from the above middle speed range. Therefore, intake pulsation suitable for the operating condition in the high speed range occurs, and the intake efficiency due to inertial supercharging in the high speed range improves. As described above, the switching valves 30, 30
By controlling the opening and closing of the intake pipes 31 and 31, each intake pipe 21 to
Equivalent pipe length of 23 is suitable for low speed range, medium speed range and high speed range 3
The stage is variably controlled, the intake efficiency is improved, the output and torque of the internal combustion engine 10 are increased, and the torque characteristic becomes flat over the entire operating range of the internal combustion engine 10. In addition,
The present invention is not limited to the above embodiment and can be variously modified. In the above embodiment, the position of the communicating portion 25 is set to L1 <L2.
However, depending on the required characteristics of the intake system,
L1 = L2 may be used, or conversely, L1> L2 may be set.
【０００９】[0009]
【発明の効果】本発明にかかる３気筒内燃機関の吸気装
置は，上記したように構成されているため，第１および
第２の切替バルブを開閉することにより，第２の連通部
より吸気上流側の範囲における第２の連通部で連通され
る吸気管の本数を，内燃機関の運転速度域に応じて増減
することができ，３気筒内燃機関の速度に応じた好適な
可変吸気装置を実現でき，機関の広い運転域にわたって
吸気効率を向上させることができる。Since the intake system for the three-cylinder internal combustion engine according to the present invention is configured as described above, the intake upstream of the second communicating portion is opened by opening and closing the first and second switching valves. It is possible to increase or decrease the number of intake pipes that are communicated with the second communicating portion in the side range according to the operating speed range of the internal combustion engine, and realize a suitable variable intake device that corresponds to the speed of the three-cylinder internal combustion engine. Therefore, the intake efficiency can be improved over a wide operating range of the engine.
【図１】 本発明の一実施例にかかる３気筒内燃機関の
吸気装置を低速域用に可変制御した状態を示す構成図で
ある。FIG. 1 is a configuration diagram showing a state in which an intake system of a three-cylinder internal combustion engine according to an embodiment of the present invention is variably controlled for a low speed range.
【図２】 同吸気装置を中速域用に可変制御した状態を
示す構成図である。FIG. 2 is a configuration diagram showing a state in which the intake device is variably controlled for a medium speed range.
【図３】 同吸気装置を高速域用に可変制御した状態を
示す構成図である。FIG. 3 is a configuration diagram showing a state in which the intake device is variably controlled for a high speed range.
１０…内燃機関 １１…気筒 ２０…スロットル ２１〜２３…吸気管 ２４…連通部（第１の連通部） ２５…連通部（第２の連通部） ３０…切替バルブ（第１の切替バルブ） ３１…切替バルブ（第２の切替バルブ） DESCRIPTION OF SYMBOLS 10 ... Internal combustion engine 11 ... Cylinder 20 ... Throttle 21-23 ... Intake pipe 24 ... Communication part (1st communication part) 25 ... Communication part (2nd communication part) 30 ... Switching valve (1st switching valve) 31 … Switching valve (second switching valve)
Claims (1)
岐して３気筒内燃機関の各気筒にそれぞれ接続されてな
る３本の吸気管が，上記一端と他端との間で第２の連通
部により相互に連通され，上記第２の連通部に該第２の
連通部を開閉制御する第１の切替バルブが設けられてな
る３気筒内燃機関の吸気装置において，上記吸気管の少
なくともいずれか１本の上記第２の連通部より吸気方向
上流部に，該吸気管を開閉制御する第２の切替バルブを
設けたことを特徴とする３気筒内燃機関の吸気装置。1. Three intake pipes, one end of which is communicated with a first communication portion and the other end of which is branched and connected to each cylinder of a three-cylinder internal combustion engine, are provided between the one end and the other end. In the intake system of a three-cylinder internal combustion engine, the intake valve is connected to each other by a second communication section, and the second communication section is provided with a first switching valve that controls opening and closing of the second communication section. An intake system for a three-cylinder internal combustion engine, characterized in that a second switching valve for controlling opening and closing of the intake pipe is provided upstream of at least one of the second communication parts of the pipe in the intake direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6146448A JPH0814050A (en) | 1994-06-28 | 1994-06-28 | Intake device for three-cylinder internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6146448A JPH0814050A (en) | 1994-06-28 | 1994-06-28 | Intake device for three-cylinder internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0814050A true JPH0814050A (en) | 1996-01-16 |
Family
ID=15407874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6146448A Pending JPH0814050A (en) | 1994-06-28 | 1994-06-28 | Intake device for three-cylinder internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0814050A (en) |
-
1994
- 1994-06-28 JP JP6146448A patent/JPH0814050A/en active Pending
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