JPS6132497B2 - - Google Patents
Info
- Publication number
- JPS6132497B2 JPS6132497B2 JP52150378A JP15037877A JPS6132497B2 JP S6132497 B2 JPS6132497 B2 JP S6132497B2 JP 52150378 A JP52150378 A JP 52150378A JP 15037877 A JP15037877 A JP 15037877A JP S6132497 B2 JPS6132497 B2 JP S6132497B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- passage
- intake valve
- main
- 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.)
- Expired
Links
- 238000002485 combustion reaction Methods 0.000 claims description 34
- 239000000446 fuel Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 12
- 230000010349 pulsation Effects 0.000 claims description 4
- 238000000746 purification Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Exhaust-Gas Circulating Devices (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、内燃機関の排気ガス浄化装置に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an exhaust gas purification device for an internal combustion engine.
従来、排気ガス温度の変化によつてHC，COの
発生がほとんど変化しない燃焼室の中央部に残留
排気ガス濃度の大きい領域が存在し、周辺壁面付
近に残留排気ガスがほとんど存在しないような成
層分布にして燃焼させることにより、周辺壁面で
発生するHC，COを増加することなく、中央部で
発生するNOxを抑制するものとして、例えば特
開昭51―108104号公報に提案されており、また給
気を入口通路から前方弁口給気路と後方弁口給気
路を通つてシリンダ内に流入させ、シリンダ内に
旋回流を起生するものとして、例えば特公昭48―
40606号公報が提案されている。
Conventionally, there is a stratified structure in which there is a region with a high concentration of residual exhaust gas in the center of the combustion chamber, where the generation of HC and CO hardly changes with changes in exhaust gas temperature, and there is almost no residual exhaust gas near the surrounding wall surface. For example, it has been proposed in JP-A-51-108104 that NOx generated in the center can be suppressed by distributed combustion without increasing HC and CO generated on the peripheral wall surface. For example, the Japanese Patent Publication Publication No. 1973-1970 is a system that causes the supply air to flow into the cylinder from the inlet passage through the front valve air supply path and the rear valve air supply path to generate a swirling flow within the cylinder.
Publication No. 40606 has been proposed.
ところで、上記先行技術の前者の場合、排気ガ
ス吸入弁より流入した排気ガスは拡散することな
く燃焼室中央部に存在するため、NOxの低減に
は有効であるが、還流排気ガス中の未燃成分を十
分に燃焼させることができないという問題があ
る。また前者と後者とを組み合わせた場合、シリ
ンダ内の強力な旋回流により還流排気ガスが給気
に均一にミキシングされ、燃焼温度が低下し
NOxの低減には有効であるが、HC，COは逆に増
大するという問題がある。
By the way, in the former case of the above-mentioned prior art, the exhaust gas that flows in from the exhaust gas intake valve exists in the center of the combustion chamber without diffusing, so it is effective in reducing NOx, but the unburned exhaust gas in the recirculated exhaust gas There is a problem that the components cannot be burned sufficiently. In addition, when the former and the latter are combined, the recirculated exhaust gas is evenly mixed with the intake air due to the strong swirling flow inside the cylinder, lowering the combustion temperature.
Although it is effective in reducing NOx, it has the problem of increasing HC and CO.
本発明は前述した事情に鑑みてなされたもの
で、排気ガスの一部を吸気系に還流させる装置を
備えた内燃機関において、NOx，HC，COの排出
を効果的に低減させると共に、燃費の悪化を防止
することができるように改良された排気ガス浄化
装置を提供しようとするものである。 The present invention was made in view of the above-mentioned circumstances, and it effectively reduces NOx, HC, and CO emissions in an internal combustion engine equipped with a device that recirculates a portion of exhaust gas to the intake system, and improves fuel efficiency. It is an object of the present invention to provide an improved exhaust gas purification device that can prevent deterioration.
この目的のため本発明は、排気ガスの一部を吸
気系に還流させる装置と、排気系に排気ガスの脈
動を利用して２次空気を導入して排気ガスを酸化
処理する装置とを備えた内燃機関において、主吸
入通路から、上記主吸入通路より断面積の小さい
副吸入通路を分岐させ、シリンダ内に形成された
燃焼室に、主吸入弁、上記主吸入弁より小径の副
吸入弁を介して、上記主吸入通路、副吸入通路を
それぞれ連通させ、上記副吸入通路に排気ガス還
流路を連通させ、上記副吸入通路からの混合気と
共に還流排気ガスを上記燃焼室へ吸入させ、か
つ、主吸入弁近傍に点火栓を設けると共に、副吸
入弁を、通常のタイミングで開閉する主吸入弁よ
り早いタイミングで開閉するように構成されてい
る。
For this purpose, the present invention includes a device that recirculates part of the exhaust gas to the intake system, and a device that uses the pulsation of the exhaust gas to introduce secondary air into the exhaust system to oxidize the exhaust gas. In an internal combustion engine, a sub-intake passage having a smaller cross-sectional area than the main intake passage is branched from the main intake passage, and a main intake valve and an auxiliary intake valve having a smaller diameter than the main intake valve are connected to the combustion chamber formed in the cylinder. The main intake passage and the auxiliary intake passage are communicated with each other through the auxiliary intake passage, and the exhaust gas recirculation passage is communicated with the auxiliary intake passage, and the recirculated exhaust gas is sucked into the combustion chamber together with the air-fuel mixture from the auxiliary intake passage; In addition, an ignition plug is provided near the main intake valve, and the auxiliary intake valve is configured to open and close at earlier timing than the main intake valve, which opens and closes at normal timing.
以下、図面を参照して本発明の一実施例を具体
的に説明する。
Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.
第１図において、符号１はシリンダヘツド、２
はピストン３を摺動自在に嵌装したシリンダブロ
ツク、４は燃焼室である。前記シリンダヘツド１
には主吸入通路５、およびこの通路５より小断面
積でこれから分岐した副吸入通路６がそれぞれ形
成されている。これらの主吸入通路５、副吸入通
路６の燃焼室４への開口部７，８には主、副吸入
弁９，１０がそれぞれ設けられ、これらの弁９，
１０は機関と同期回転するカム１１，１２により
開閉作動するように構成されている。また、点火
栓１３は主吸入弁９の近傍に設けられており、副
吸入通路６の開口部８および副吸入弁１０は、主
吸入通路５の開口部７および主吸入弁９より小径
にされている。さらに、前記カム１１と１２の形
状を異らせることによつて、副吸入弁１０は主吸
入弁９より早いタイミングで開閉動作するように
構成されている。前記吸入通路５には吸入管１４
から気化器１５で作られた混合気が供給されるよ
うになつている。１６は排気通路で、この排気通
路１６の燃焼室４への開口部１７には排気弁１８
が設けられている。 In FIG. 1, numeral 1 is the cylinder head, 2
4 is a cylinder block in which a piston 3 is slidably fitted, and 4 is a combustion chamber. Said cylinder head 1
A main suction passage 5 and a sub suction passage 6 branched from the main suction passage 5 and having a smaller cross-sectional area than the passage 5 are formed. Main and auxiliary intake valves 9 and 10 are provided in the openings 7 and 8 of the main intake passage 5 and the auxiliary intake passage 6 to the combustion chamber 4, respectively.
10 is configured to be opened and closed by cams 11 and 12 that rotate in synchronization with the engine. Further, the spark plug 13 is provided near the main intake valve 9, and the opening 8 of the auxiliary intake passage 6 and the auxiliary intake valve 10 are made smaller in diameter than the opening 7 of the main intake passage 5 and the main intake valve 9. ing. Furthermore, by making the shapes of the cams 11 and 12 different, the sub-intake valve 10 is configured to open and close at a timing earlier than the main intake valve 9. A suction pipe 14 is provided in the suction passage 5.
The air-fuel mixture produced by the carburetor 15 is supplied from the carburetor 15. Reference numeral 16 denotes an exhaust passage, and an exhaust valve 18 is provided at the opening 17 of the exhaust passage 16 to the combustion chamber 4.
is provided.
排気ガス還流装置ａは、排気通路１６に接続さ
れた排気管１９に排気ガス還流路２０の一端が開
口され、この通路２０の他端が前記副吸入通路６
に接続されている。排気ガス還流路２０には排気
ガス還流制御弁２１が設けられ、この制御弁２１
は吸入管１４と接続する負圧室２２が大気側２３
とダイヤフラム２４で仕切られ、このダイヤフラ
ム２４に弁体２５が装着され、ダイヤフラム２４
がばね２６で支持されている。 In the exhaust gas recirculation device a, one end of an exhaust gas recirculation passage 20 is opened to an exhaust pipe 19 connected to the exhaust passage 16, and the other end of this passage 20 is opened to the exhaust pipe 19 connected to the exhaust passage 16.
It is connected to the. The exhaust gas recirculation path 20 is provided with an exhaust gas recirculation control valve 21 .
The negative pressure chamber 22 connected to the suction pipe 14 is located on the atmospheric side 23
and a diaphragm 24, a valve body 25 is attached to this diaphragm 24, and the diaphragm 24
is supported by a spring 26.
排気系に排気ガスの脈動を利用して２次空気を
導入する装置ｂは、排気通路１６に２次空気導入
通路２７の一端が接続され、この通路２７の他端
がエアクリーナ２８を介して大気に開放され、さ
らに２次空気導入通路２７は逆止弁２９を備えて
いる。 In device b, which introduces secondary air into the exhaust system by utilizing pulsation of exhaust gas, one end of a secondary air introduction passage 27 is connected to the exhaust passage 16, and the other end of this passage 27 is connected to the atmosphere through an air cleaner 28. The secondary air introduction passage 27 is further provided with a check valve 29.
なお第１図中、３０は排気弁１８を開閉作動さ
せるカムである。 In FIG. 1, 30 is a cam that opens and closes the exhaust valve 18.
以上の構成において、基本動作は通常の４サイ
クル機関と同様である。そして、機関の低負荷時
には、吸気負圧が大きく、排気ガス還流制御弁２
１の負圧室２２の負圧も大きいため、弁体２５が
排気ガス還流路２０を閉じて排気ガスの還流は行
なわれず、低負荷運転時には主、副吸入通路５，
６には気化器１５で作られた混合気だけが供給さ
れ、両吸入通路５，６からその開口面積比に応じ
て吸入される混合気の相互干渉によつて、よりよ
い燃焼が行われる。機関の加速時や中、高負荷時
には、吸入負圧が小さく負圧室２２の負圧も小さ
いため、ばね２６で弁体２５が開動作され、排気
ガス還流路２０が開いて排気管１９から排気ガス
の一部が排気ガス還流路２０を通り副吸入通路６
に導かれる。したがつて、主吸入弁９および副吸
入弁１０が開くと、主吸入通路５からは混合気
が、副吸入通路６からは還流排気ガスが混合気に
ミキシングされて燃焼室４に吸入される。 In the above configuration, the basic operation is the same as that of a normal four-cycle engine. When the engine is under low load, the intake negative pressure is large and the exhaust gas recirculation control valve 2
Since the negative pressure in the negative pressure chamber 22 of No. 1 is also large, the valve body 25 closes the exhaust gas recirculation path 20 and the exhaust gas is not recirculated.
Only the air-fuel mixture produced by the carburetor 15 is supplied to the air-fuel mixture 6, and better combustion is achieved through mutual interference between the air-fuel mixtures sucked in from both intake passages 5 and 6 according to their opening area ratios. When the engine is accelerating or under medium or high load, the suction negative pressure is small and the negative pressure in the negative pressure chamber 22 is also small, so the valve body 25 is opened by the spring 26, the exhaust gas recirculation path 20 is opened, and the exhaust gas is discharged from the exhaust pipe 19. A part of the exhaust gas passes through the exhaust gas recirculation passage 20 and enters the sub-intake passage 6.
guided by. Therefore, when the main intake valve 9 and the auxiliary intake valve 10 open, the air-fuel mixture is mixed from the main intake passage 5 and the recirculated exhaust gas is mixed from the auxiliary intake passage 6 into the air-fuel mixture, which is then sucked into the combustion chamber 4. .
また第２図に示すように、まず副吸入弁１０が
早いタイミングで開き、次に主吸入弁９が通常の
タイミングで開く。即ち、副吸入弁１０は排気弁
１８の開口面積が比較的大きいうちに開くので、
副吸入通路６の負圧により、燃焼室４へ引き戻さ
れる排気ガスの還流量が多く、更に、副吸入弁１
０は早いタイミングで閉じるので、副吸入弁１０
付近には混合気にミキシングされた還流排気ガス
と、点火栓１３の設けられている主吸入弁９近傍
における着火性のすぐれた新気とが、成層的に存
在する。 Further, as shown in FIG. 2, first the sub-intake valve 10 opens at early timing, and then the main intake valve 9 opens at normal timing. That is, since the sub-intake valve 10 opens while the opening area of the exhaust valve 18 is relatively large,
Due to the negative pressure in the auxiliary intake passage 6, a large amount of exhaust gas is returned to the combustion chamber 4, and furthermore, the auxiliary intake valve 1
0 closes at an early timing, so the sub-intake valve 10
Nearby, recirculated exhaust gas mixed into an air-fuel mixture and fresh air with excellent ignitability near the main intake valve 9 where the spark plug 13 is provided exist in a stratified manner.
このため燃焼行程において、着火性がよく、ま
た燃焼が急激に行われず、還流排気ガス中の未燃
成分も燃焼し、そして等温緩慢燃焼に近い穏やか
な燃焼が行われる。 Therefore, in the combustion process, ignitability is good, combustion does not occur rapidly, unburned components in the recirculated exhaust gas are also combusted, and gentle combustion similar to isothermal slow combustion is performed.
以上説明したとおり本発明によれば、
副吸入通路に排気ガス還流路が連通され、還流
排気ガスを副吸入通路からの混合気と共に燃焼室
へ吸入させ、かつ、副吸入弁を、通常のタイミン
グで開閉する主吸入弁より早いタイミングで開閉
するようにしたので、還流排気ガスが混合気によ
り希釈されて燃焼室へ吸入され、副吸入弁の周囲
に混合気でミキシングされた排気ガスと、主吸入
弁の周囲に着火性のすぐれた新気とを、成層的に
存在させることができ、
燃焼行程において、主吸入弁の周囲に着火性の
すぐれた新気が存在し、かつ主吸入弁の付近に点
火栓が設けられているので着火性にすぐれ、かつ
副吸入弁周囲の還流排気ガスは混合気とよくミキ
シングされているので、還流排気ガスによる不整
燃焼が防止され、還流排気ガス中の未燃成分をも
燃焼される。そして等温緩慢燃焼に近い穏やかな
燃焼が行われ、NOx発生に最も不利となる初期
燃焼を穏やかにすることができる。
As explained above, according to the present invention, the exhaust gas recirculation passage is communicated with the sub-intake passage, the recirculated exhaust gas is sucked into the combustion chamber together with the air-fuel mixture from the sub-intake passage, and the sub-intake valve is operated at the normal timing. Since the main intake valve opens and closes at earlier timing than the main intake valve, which opens and closes at Fresh air with excellent ignitability can exist in a stratified manner around the intake valve, and during the combustion stroke, fresh air with excellent ignitability exists around the main intake valve, and fresh air with excellent ignitability exists around the main intake valve. Since the ignition plug is installed nearby, it has excellent ignitability, and the recirculated exhaust gas around the sub-intake valve is well mixed with the air-fuel mixture, which prevents irregular combustion caused by the recirculated exhaust gas and reduces the Unburnt components are also burned. Then, a gentle combustion similar to isothermal slow combustion is performed, and the initial combustion, which is most disadvantageous to NOx generation, can be made gentler.
さらに、燃焼行程において等温緩慢燃焼に近い
穏やかな燃焼が行われることによつて、NOxの
出やすい加速時や中負荷時にNOxの発生を十分
に抑制することができる。 Furthermore, by performing gentle combustion similar to isothermal slow combustion in the combustion stroke, it is possible to sufficiently suppress the generation of NOx during acceleration and under medium load, when NOx is likely to be generated.
また、副吸入弁の開き始めのタイミングを早め
ているので、排気通路への２次空気供給量を多く
することができ、排気ガスの再燃焼、酸化が確実
になされ、HC，COの排出も確実に低減させるこ
とができる。更に、副吸入弁が早いタイミングで
開き、排気弁が開いているこれらのオーバラツプ
期間が長くなつても、副吸入弁は小径であるため
副吸入通路から燃焼室に導入された混合気の吹抜
け量が比較的少なく、さらに従来のように、主吸
入弁の開放タイミングを早くし、あるいは副吸入
弁を設けることなく吸入弁の開放タイミングを早
くするのに比べ、燃料のロスが少なく、燃費を少
なくし得るなどの効果がある。 In addition, since the opening timing of the sub-intake valve is advanced, the amount of secondary air supplied to the exhaust passage can be increased, ensuring re-burning and oxidation of exhaust gas, and reducing HC and CO emissions. It can be definitely reduced. Furthermore, even if the overlapping period in which the auxiliary intake valve opens at an early timing and the exhaust valve opens becomes longer, the amount of air-fuel mixture introduced from the auxiliary intake passage into the combustion chamber will be reduced because the auxiliary intake valve has a small diameter. Furthermore, compared to the conventional method of opening the main intake valve earlier or opening the intake valve earlier without providing a sub-intake valve, there is less fuel loss and lower fuel consumption. There are many effects that can be achieved.
第１図は本発明の一実施例を示す縦断説明図、
第２図は本発明のバルブタイミングの説明図であ
る。
１…シリンダヘツド、２…シリンダブロツク、
３…ピストン、４…燃焼室、５…主吸入通路、６
…副吸入通路、７，８…主，副吸入通路の開口
部、９…主吸入弁、１０…副吸入弁、１１，１２
…カム、１３…点火栓、１４…吸入管、１５…気
化器、１６…排気通路、１７…排気通路の開口
部、１８…排気弁、１９…排気管、２０…排気ガ
ス還流路、２１…排気ガス還流制御弁、２２…負
圧室、２３…大気側の室、２４…ダイヤフラム、
２５…弁体、２６…ばね、２７…２次空気導入通
路、２８…エアクリーナ、２９…逆止弁、３０…
カム、ａ…排気ガス還流装置、ｂ…排気系に排気
ガスの脈動を利用して２次空気を導入する装置。
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention;
FIG. 2 is an explanatory diagram of the valve timing of the present invention. 1...Cylinder head, 2...Cylinder block,
3... Piston, 4... Combustion chamber, 5... Main intake passage, 6
... Sub-suction passage, 7, 8... Main and sub-suction passage openings, 9... Main suction valve, 10... Sub-suction valve, 11, 12
...Cam, 13...Spark plug, 14...Suction pipe, 15...Carburizer, 16...Exhaust passage, 17...Exhaust passage opening, 18...Exhaust valve, 19...Exhaust pipe, 20...Exhaust gas recirculation passage, 21... Exhaust gas recirculation control valve, 22...Negative pressure chamber, 23...Atmospheric side chamber, 24...Diaphragm,
25... Valve body, 26... Spring, 27... Secondary air introduction passage, 28... Air cleaner, 29... Check valve, 30...
Cam, a...Exhaust gas recirculation device, b...A device that introduces secondary air into the exhaust system using the pulsation of exhaust gas.
Claims (1)
と、排気系に排気ガスの脈動を利用して２次空気
を導入して排気ガスを酸化処理する装置とを備え
た内燃機関において、 主吸入通路から、上記主吸入通路より断面積の
小さい副吸入通路を分岐させ、シリンダ内に形成
された燃焼室に、主吸入弁、上記主吸入弁より小
径の副吸入弁を介して、上記主吸入通路、副吸入
通路をそれぞれ連通させ、 上記副吸入通路に排気ガス還流路を連通させ、
上記副吸入通路からの混合気と共に還流排気ガス
を上記燃焼室へ吸入させ、 かつ、主吸入弁近傍に点火栓を設けると共に、
副吸入弁を、タイミングで開閉する主吸入弁より
早いタイミングで開閉するように構成したことを
特徴とする内燃機関の排気ガス浄化装置。[Scope of Claims] 1. A device that recirculates part of the exhaust gas to the intake system, and a device that uses the pulsation of the exhaust gas to introduce secondary air into the exhaust system to oxidize the exhaust gas. In an internal combustion engine, a sub-intake passage having a smaller cross-sectional area than the main intake passage is branched from the main intake passage, and a main intake valve and an auxiliary intake valve having a smaller diameter than the main intake valve are installed in the combustion chamber formed in the cylinder. through which the main suction passage and the sub suction passage are communicated with each other, and the sub suction passage is communicated with the exhaust gas recirculation passage,
The recirculated exhaust gas is sucked into the combustion chamber together with the air-fuel mixture from the auxiliary intake passage, and an ignition plug is provided near the main intake valve, and
An exhaust gas purification device for an internal combustion engine, characterized in that the auxiliary intake valve is configured to open and close at earlier timing than the main intake valve, which opens and closes at timing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15037877A JPS5482526A (en) | 1977-12-14 | 1977-12-14 | Internal combustion engine exhaust gas purifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15037877A JPS5482526A (en) | 1977-12-14 | 1977-12-14 | Internal combustion engine exhaust gas purifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5482526A JPS5482526A (en) | 1979-06-30 |
| JPS6132497B2 true JPS6132497B2 (en) | 1986-07-28 |
Family
ID=15495676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15037877A Granted JPS5482526A (en) | 1977-12-14 | 1977-12-14 | Internal combustion engine exhaust gas purifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5482526A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0413796U (en) * | 1990-05-24 | 1992-02-04 | ||
| JPH06108765A (en) * | 1992-03-09 | 1994-04-19 | Hayashi Kosan Kk | Opening and closing device for door provided at temporary gate of construction site |
-
1977
- 1977-12-14 JP JP15037877A patent/JPS5482526A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0413796U (en) * | 1990-05-24 | 1992-02-04 | ||
| JPH06108765A (en) * | 1992-03-09 | 1994-04-19 | Hayashi Kosan Kk | Opening and closing device for door provided at temporary gate of construction site |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5482526A (en) | 1979-06-30 |
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