JPS5944501B2 - Internal combustion engine fuel supply system - Google Patents
Internal combustion engine fuel supply systemInfo
- Publication number
- JPS5944501B2 JPS5944501B2 JP50045802A JP4580275A JPS5944501B2 JP S5944501 B2 JPS5944501 B2 JP S5944501B2 JP 50045802 A JP50045802 A JP 50045802A JP 4580275 A JP4580275 A JP 4580275A JP S5944501 B2 JPS5944501 B2 JP S5944501B2
- Authority
- JP
- Japan
- Prior art keywords
- air
- fuel
- passage
- air bleed
- bleed passage
- 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
Landscapes
- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
Description
【発明の詳細な説明】
本発明は気化器に補助エアブリード通路を設け、該補助
エアブリード通路を開閉して、空燃比を制御する内燃機
関の燃料供給装置において、補助エアブリード通路内の
圧力変動を減少させる燃料供給装置に関する。Detailed Description of the Invention The present invention provides a fuel supply system for an internal combustion engine in which an auxiliary air bleed passage is provided in a carburetor and the auxiliary air bleed passage is opened and closed to control the air-fuel ratio. The present invention relates to a fuel supply device that reduces fluctuations.
従来、排気管等に０２センサー等の空燃比検出装置を設
け、該検出装置の信号をフィードバックすることによっ
て、供給燃料の空燃比を理論空燃比に制御し、例えば三
元触媒によって排気を浄化する装置として、気化器のエ
アブリード通路に補助エアブリード通路を設け、該補助
エアブリード通路を開閉することによって、燃料に混合
される空気量を制御するために、上記０２センサー等の
信号によって補助エアブリード通路開閉装置のオンとオ
フの時間の比率を変化させる内燃機関の燃料供給装置は
知られている。Conventionally, an air-fuel ratio detection device such as an 02 sensor is provided in an exhaust pipe, etc., and the air-fuel ratio of the supplied fuel is controlled to the stoichiometric air-fuel ratio by feeding back the signal of the detection device, and the exhaust gas is purified using, for example, a three-way catalyst. As a device, an auxiliary air bleed passage is provided in the air bleed passage of the carburetor, and by opening and closing the auxiliary air bleed passage, the auxiliary air is controlled by the signal from the 02 sensor, etc., in order to control the amount of air mixed with the fuel. BACKGROUND OF THE INVENTION Fuel supply systems for internal combustion engines that vary the ratio of on and off times of a bleed passage opening/closing device are known.
該装置は、概念的には、エアブリードの開口面積を変化
させて、燃料と混合する空気量を制御することに相当す
るものである。Conceptually, this device is equivalent to controlling the amount of air mixed with fuel by changing the opening area of the air bleed.
ところで、内燃機関の燃焼は連続的ではないために、機
関の行程によって、吸気通路や排気通路内に圧力変動が
発生することは、避けられないことである。Incidentally, since combustion in an internal combustion engine is not continuous, it is unavoidable that pressure fluctuations occur in the intake passage and the exhaust passage depending on the stroke of the engine.
例えば、吸気系内について考えてみると、吸気弁が開い
た吸気行程では、吸気系が負圧となって、空気が流入す
るために、吸気流量が増大する。For example, considering the inside of the intake system, during the intake stroke when the intake valve is open, the intake system becomes a negative pressure and air flows in, so the intake flow rate increases.
吸気弁が閉じている時は、慣性流による空気流だけのた
め、吸気流量は減少する。When the intake valve is closed, the intake flow rate decreases because only the airflow is due to inertial flow.
気化器からの燃料の供給はこの空気流量に応じてベンチ
ュリ一部に生ずる負圧を用いてノズルから燃料が吐出す
るように行われているから、このような吸気流量の脈動
は直ちに供給燃料量の変動に多大な影響を与える。The fuel is supplied from the carburetor by using the negative pressure generated in a part of the venturi according to the air flow rate, so that the fuel is discharged from the nozzle. Therefore, such pulsations in the intake flow rate immediately increase the amount of supplied fuel. has a significant impact on fluctuations in
そしてこの上記燃料供給の主要因である吸気流量の脈動
は、機関の回転数によって変化するし、また機関の気筒
数によっても変化することは明らかである。It is clear that the pulsation of the intake air flow rate, which is the main factor in the fuel supply, changes depending on the rotational speed of the engine, and also changes depending on the number of cylinders in the engine.
一方、燃料吐出量は補助エアブリード通路から燃料通路
へ導入される空気量変動によっても影響される。On the other hand, the amount of fuel discharged is also affected by changes in the amount of air introduced from the auxiliary air bleed passage into the fuel passage.
この空気量変動は例えば電磁弁等の補助エアブリード通
路の開閉手段の開閉によって生じこれを避けることはで
きない。This air amount fluctuation occurs due to the opening and closing of the auxiliary air bleed passage opening/closing means, such as a solenoid valve, and cannot be avoided.
勿論周期を長くすれば良いが、応答性が悪くなり、制御
という本来の意味を失うことになる。Of course, it would be possible to lengthen the cycle, but this would result in poor responsiveness and the original meaning of control would be lost.
以上のことよりわかるように、燃料吐出は吸気通路内の
吸気流量脈動と、補助エアブリード通路を流通する空気
量変動とによって影響され、夫々が運転状態や機関回転
数によって同期した場合にはある気筒には余分の燃料を
供給し、他の気筒では燃料が不足するという事態を招く
。As can be seen from the above, fuel discharge is affected by the intake flow rate pulsations in the intake passage and the air volume fluctuations flowing through the auxiliary air bleed passage, and when each is synchronized depending on the operating condition and engine speed, Extra fuel is supplied to the cylinder, causing a situation where other cylinders run out of fuel.
その結果として濃混合気気筒では排気が悪くなり、希薄
気筒では失火等が起り易くなる。As a result, exhaust gas becomes poor in rich mixture cylinders, and misfires are more likely to occur in lean cylinders.
本発明は、以上のような燃料供給のバラツキ、分配の悪
化、排気有害成分の増加、失火等による運転性の悪化等
の諸欠点を改良し、空燃比制御の正確さ、確実性を向上
させて有効な排気浄化装置を得ることを目的とする。The present invention improves the above-mentioned drawbacks such as variations in fuel supply, deterioration in distribution, increase in harmful exhaust components, and deterioration in drivability due to misfires, etc., and improves the accuracy and reliability of air-fuel ratio control. The purpose is to obtain an effective exhaust gas purification device.
以下に従来例との比較において本発明の１実施例を添付
図面に基づいて説明する。An embodiment of the present invention will be described below with reference to the accompanying drawings in comparison with a conventional example.
第１図は従来例の気化器である。FIG. 1 shows a conventional carburetor.
エアブリード通路（エマルジョンチューブ若しくはエア
ブリードウェルを含む）１に通ずる補助エアブリード通
路２の開口部２ａに開閉装置（本例では電磁弁）３を設
ける。An opening/closing device (a solenoid valve in this example) 3 is provided at an opening 2a of an auxiliary air bleed passage 2 that communicates with an air bleed passage (including an emulsion tube or an air bleed well) 1.
該開閉装置３は、振動子４とこれを作動させるコイル５
及びリターンスプリング６よりなり、コイル５に通電す
ると、大気開放ロアを介して、補助エアブリード通路２
が大気に通ずるようになっている。The opening/closing device 3 includes a vibrator 4 and a coil 5 that operates the vibrator 4.
and a return spring 6, and when the coil 5 is energized, the auxiliary air bleed passage 2 is
is now open to the atmosphere.
該開閉装置３のケンとオフの時間の比率は、排気管１０
に設けた０２センサー１１等による空燃比検出装置から
の信号によって、制御回路１２が決定し、その周期は一
般的に短い。The ratio of ON and OFF times of the opening/closing device 3 is equal to that of the exhaust pipe 10.
The control circuit 12 determines this based on a signal from an air-fuel ratio detection device such as the 02 sensor 11 installed in the 02 sensor 11, and the period thereof is generally short.
図において１３はエアブリード、１４はノズズル、１５
はベンチュリー、１６は燃料通路を示す。In the figure, 13 is an air bleed, 14 is a nozzle, and 15
indicates a venturi, and 16 indicates a fuel passage.
その作動は制御回路１２の信号によってコイル５を励・
消磁して振動子４を吸引し或いはリターンスプリング６
の弾性復元力により繰り返し振動させる。The operation is performed by exciting the coil 5 by a signal from the control circuit 12.
Demagnetize and attract the vibrator 4 or return spring 6
Repeatedly vibrate due to the elastic restoring force.
振動子４の振動による補助エアブリード通路２の開口部
２ａの開閉によって、補助エアブリード通路２内に圧力
脈動が生ずると共に該通路２内を流通する空気量が脈を
打つ。The opening and closing of the opening 2a of the auxiliary air bleed passage 2 due to the vibration of the vibrator 4 generates pressure pulsations within the auxiliary air bleed passage 2, and the amount of air flowing through the passage 2 pulses.
該圧力脈動は、エアブリード通路１に及び、燃料内に混
入する空気量を変動させ、かつ補助エアブリード通路２
を流通する空気量の変動も直接に作用してノズル１４か
らの燃料吐出量に変動をきたす。The pressure pulsations reach the air bleed passage 1, fluctuate the amount of air mixed into the fuel, and cause the auxiliary air bleed passage 2 to fluctuate.
Fluctuations in the amount of air flowing through the nozzle 14 also directly affect the amount of fuel discharged from the nozzle 14.
この場合、補助エアブリード通路２の容積はせいぜい１
ｃｃと小さいので上記変動の吸収に役立たない。In this case, the volume of the auxiliary air bleed passage 2 is at most 1
Since it is small as cc, it is not useful for absorbing the above fluctuation.
従ってこの変動と吸気流量脈動とが同期した場合、ある
気筒には濃混合気が、他の気筒には希薄混合気のみが連
続して供給されるために、失火を起したり、排気性能を
悪化させたり、あるいは運転性を悪くすること既述の通
りである。Therefore, if this fluctuation and intake flow rate pulsation are synchronized, a rich mixture will be continuously supplied to one cylinder and only a lean mixture to another cylinder, which may cause misfires or reduce exhaust performance. As mentioned above, it may cause deterioration or impair drivability.
第２図は本発明の一実施例であって第１図に示す従来装
置の開閉装置３の大気開放ロアと、補助エアブリード通
路２の開口部２ａとの間にダンパー室２０を設け、該ダ
ンパー室２０の開口部２０ａを振動子４で開閉するよう
にしたものである。FIG. 2 shows an embodiment of the present invention, in which a damper chamber 20 is provided between the atmosphere opening lower of the opening/closing device 3 of the conventional device shown in FIG. 1 and the opening 2a of the auxiliary air bleed passage 2. The opening 20a of the damper chamber 20 is opened and closed by a vibrator 4.
このため振動子４の振動によって、開口部２０ａに発生
する圧力変動のエネルギー疎密波は、ダンパー室２０内
の空気のダンパー作用によって、拡散緩衝されて減衰し
、補助エアブリード通路２に達する頃には、上記圧力変
動を微小とすることができ補助エアブリード通路２の前
記差圧が安定して振動子４の振動によって断続される空
気流があっても補助エアブリード通路２を流れる空気流
量は脈動的変動をきたさない。Therefore, the energy compression wave of pressure fluctuation generated in the opening 20a due to the vibration of the vibrator 4 is diffused and buffered and attenuated by the damper action of the air in the damper chamber 20, and by the time it reaches the auxiliary air bleed passage 2. The above pressure fluctuation can be made minute, the differential pressure in the auxiliary air bleed passage 2 is stable, and even if there is an air flow that is interrupted by the vibration of the vibrator 4, the air flow rate flowing through the auxiliary air bleed passage 2 is No pulsating fluctuations.
従って、吸気脈動と同期することもなく、排気浄化性能
と運転性を向上することができる。Therefore, the exhaust purification performance and drivability can be improved without synchronizing with the intake pulsation.
この空気ダンパー室２０の容積は、開閉装置３による圧
力変動及び空気量変動を消す意味から考えれば、出来る
だけ大きい方が望ましいことは言うまでもない。Needless to say, it is desirable that the volume of the air damper chamber 20 be as large as possible in order to eliminate pressure fluctuations and air volume fluctuations caused by the opening/closing device 3.
しかしこの場合余り大きくすると、開閉装置３の開閉の
時間の比率を変化させる時に、その応答性が遅くなるこ
とが考えられる。However, in this case, if it is made too large, the responsiveness may become slow when changing the ratio of opening/closing time of the opening/closing device 3.
そこで該開閉装置による圧力変動は、完全に消さなけれ
ばならないという意味のものではなく、その悪影響を出
来るだけ抑えることに意味があるから、ダンパー室２０
の容積は、排気量１０００〜４０００ＣＣ程度のエンジ
ンの場合約１０〜２００ＣＣ程度で充分である。Therefore, the pressure fluctuations caused by the opening/closing device do not mean that they must be completely eliminated, but it is meaningful to suppress their negative effects as much as possible.
For an engine with a displacement of about 1000 to 4000 cc, a volume of about 10 to 200 cc is sufficient.
ダンパー室２０の容積と燃料吐出量との追従性の関係を
第３図に示す。FIG. 3 shows the relationship between the volume of the damper chamber 20 and the amount of fuel discharged.
第３図ではダンパー室が大きくなるにつれ燃料吐出の波
が時間に対してずれる（遅れる）様子が判る。In FIG. 3, it can be seen that as the damper chamber becomes larger, the wave of fuel discharge deviates (delays) with respect to time.
なお、本発明装置におけるダンパーは気体の流通量変動
・エネルギー波動の伝播を減衰させるダンパー室のほか
、これと同目的の減衰部材（例えば、金網、目の荒い布
等）を補助エアブリード通路に介装したり、或いはダン
パー室内に設置して、相乗作用を持たせるものを含むこ
とは言うまでもない。The damper in the device of the present invention has a damper chamber that dampens gas flow rate fluctuations and propagation of energy waves, as well as a damping member for the same purpose (e.g., wire mesh, coarse cloth, etc.) in the auxiliary air bleed passage. It goes without saying that this includes things that are interposed or installed in the damper chamber to provide a synergistic effect.
又補助エアブリードを図中２点鎖線で示すように燃料通
路１６に接続した場合も上記と同様な効果が得られ、更
に開閉装置として、電磁弁以外のものを応用できること
も明らかである。Furthermore, when the auxiliary air bleed is connected to the fuel passage 16 as shown by the two-dot chain line in the figure, the same effect as described above can be obtained, and it is also clear that something other than a solenoid valve can be used as the opening/closing device.
以上のように、本発明装置によれば、空燃比検出装置か
らの信号に応じ短かい周期でオンオフ的に繰り返し開閉
する開閉弁により補助エアブリードからの供給燃料中へ
補助空気を間欠的に供給するようにし、かつこの間欠的
補助空気供給による補助空気流量の変動と吸入空気量変
動との同期を、補助エアブリードに設けたダンパの作用
で補助空気流量脈動を減少するようにして防止したので
、空燃比制御は微小制御を可能とし精度良くかつ大きな
変動を伴なうことなく安定して行なうことができ、ひい
ては機関燃焼室における空燃比変動による失火等を招く
ことなく、排気浄化性能や運転性を向上させた、内燃機
関の燃料供給装置を得ることができる。As described above, according to the device of the present invention, auxiliary air is intermittently supplied into the fuel supplied from the auxiliary air bleed by the on-off valve that repeatedly opens and closes on and off in short cycles in response to the signal from the air-fuel ratio detection device. In addition, synchronization between fluctuations in the auxiliary air flow rate due to the intermittent auxiliary air supply and fluctuations in the intake air amount is prevented by reducing auxiliary air flow rate pulsations through the action of a damper installed in the auxiliary air bleed. , air-fuel ratio control enables minute control and can be performed accurately and stably without large fluctuations, thereby improving exhaust purification performance and operation without causing misfires due to air-fuel ratio fluctuations in the engine combustion chamber. A fuel supply device for an internal combustion engine with improved performance can be obtained.
開閉装置による混入空気量制御は補助エアブリードにつ
いてのみなされてエアブリード１３は常に開放されるか
ら制御による空燃比変動を小さく抑制することができる
。Since the amount of air mixed in by the opening/closing device is controlled only for the auxiliary air bleed, and the air bleed 13 is always opened, fluctuations in the air-fuel ratio due to the control can be suppressed to a small level.
また開閉装置の開閉作動は短い周期で繰り返されるオン
とオフの時間的比率を変化させることによってなされる
から、検出された空燃比の値によって空燃比制御中を大
きくも小さくも自由にできるので、応答性を速めること
及び微小制御をして精度を向上させること等任意の制御
を行なうことができ、その結果空燃比を理論空燃比付近
に安定させることができる。In addition, since the opening/closing operation of the switching device is performed by changing the time ratio of ON and OFF cycles repeated in short cycles, the air-fuel ratio can be controlled to be large or small depending on the detected air-fuel ratio value. It is possible to perform arbitrary control such as speeding up the response and improving accuracy through minute control, and as a result, the air-fuel ratio can be stabilized near the stoichiometric air-fuel ratio.
第１図は従来例の縦断面図、第２図は本発明の１実施例
の縦断面図である。
第３図はダンパー室の容積と燃料吐出量との関係を示す
グラフである。
２・・・・・・補助エアブリード通路、３・・・・・・
開閉装置、２０・・・・・・ダンパー室。FIG. 1 is a longitudinal sectional view of a conventional example, and FIG. 2 is a longitudinal sectional view of an embodiment of the present invention. FIG. 3 is a graph showing the relationship between the volume of the damper chamber and the amount of fuel discharged. 2... Auxiliary air bleed passage, 3...
Switchgear, 20... Damper room.
Claims (1)
料通路から分岐した補助エアブリード通路と、該通路を
短かい周期でオンオフ的に繰返し開閉する開閉装置上を
備え、排気系に設けた空燃比検出装置からの信号で該開
閉装置のオンとオフの時間の比率を変化させることによ
って、供給燃料の空燃比を制御する燃料供給装置におい
て、前記開閉装置下流の前記補助エアブリード通路の空
気流れ中に気体の流通量変動・エネルギー波動の伝播を
減衰させるダンパーを介装したことを特徴とする内燃機
関の燃料供給装置。1. An auxiliary air bleed passage branched from the air bleed passage of the carburetor or from the fuel passage, and an air-fuel ratio detection device installed in the exhaust system, equipped with a switching device that repeatedly opens and closes the passage on and off in short cycles. In a fuel supply device that controls the air-fuel ratio of the supplied fuel by changing the ratio of on and off times of the switchgear with a signal from the device, in the air flow of the auxiliary air bleed passage downstream of the switchgear. A fuel supply device for an internal combustion engine, characterized in that it is equipped with a damper that attenuates fluctuations in gas flow rate and propagation of energy waves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50045802A JPS5944501B2 (en) | 1975-04-17 | 1975-04-17 | Internal combustion engine fuel supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50045802A JPS5944501B2 (en) | 1975-04-17 | 1975-04-17 | Internal combustion engine fuel supply system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS51121626A JPS51121626A (en) | 1976-10-25 |
| JPS5944501B2 true JPS5944501B2 (en) | 1984-10-30 |
Family
ID=12729389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50045802A Expired JPS5944501B2 (en) | 1975-04-17 | 1975-04-17 | Internal combustion engine fuel supply system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5944501B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60185051U (en) * | 1984-05-18 | 1985-12-07 | スズキ株式会社 | Outside air introduction type air bleed type vaporizer |
| JP2000054880A (en) | 1998-08-05 | 2000-02-22 | Honda Motor Co Ltd | Intake a/f controller for outboard engine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4937025A (en) * | 1972-08-18 | 1974-04-06 | ||
| JPS49117838A (en) * | 1973-03-19 | 1974-11-11 | ||
| JPS5055723A (en) * | 1973-09-19 | 1975-05-16 |
-
1975
- 1975-04-17 JP JP50045802A patent/JPS5944501B2/en not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4937025A (en) * | 1972-08-18 | 1974-04-06 | ||
| JPS49117838A (en) * | 1973-03-19 | 1974-11-11 | ||
| JPS5055723A (en) * | 1973-09-19 | 1975-05-16 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS51121626A (en) | 1976-10-25 |
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