JPS58197428A - Engine with supercharger - Google Patents

Abstract

PURPOSE:To prevent the lowering of the output of a captioned engine by starting to open a throttle valve for charging-control in a supercharging route from the point where a throttle valve for air or air-fuel mixture control in a natural suction route is opened halfway for avoiding the inclination of the air-fuel ratio of the mixture to be lean near the full opening of an accelerator. CONSTITUTION:Air-fuel mixture is introduced into a cylinder 1 via a suction passage 7 on the basis of negative pressure generated by the fall of a piston 4 in a natural suction route 2. The pressurized air by a supercharger 11 is introduced into the cylinder 1 through a supercharging passage 13 via a supercharging port in a supercharging route 3. A suction valve 8 is opened near the top dead point, and closed when passing the bottom dead point. A supercharging valve 14 is opened on the way of the opening of a suction valve 8, and closed after the suction valve is closed. When a throttle valve 16 of a carburetter 9 is about 60-80% opened, a throttle valve 15 of a supercharging route 3 starts opening.

Description

【発明の詳細な説明】 本発明は、通常の自然吸気系路と過給機を有した過給系
路とを独立に設けてなる過給機エンジンに関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a supercharged engine in which a normal naturally aspirated line and a supercharged line including a supercharger are independently provided.

この種のエンジンに関する先行技術として、先に出願し
た特願昭５６−ｘ５７９ｘｏｔｌｃ示されてい為ように
、ピストンの降下に伴って生じるＶＩ＃ンダ内の負圧を
利用して混合気をシリンダ内に供給する自然＠覧系絡と
、過給＊ｉＣよって加圧した空気を１記Ｖリン〆に強制
的に供給する過給系路とを独立に般けておき、各サイク
ル毎に、まず、自然吸気系路の終端に設けた吸傑弁を開
いて該自然＠慨系賂からＶ９ンダ内に混合気を導入する
とともに、＃紀過給系路の終端に設けた過給弁ｔｍｖ＊
蜜弁が開いている期間の途中から開弁させて該過給系路
から＠記シリンダ内に加圧空電を充填するよう和したも
のがある。そして、このものは、逆止弁を過給系路に設
け、前記過給弁を第１図に示すようＫｍ記吸覧弁よりも
遅れて閉じるように設定することによって充填効率を高
めるようにしである。As a prior art related to this type of engine, as shown in the previously filed Japanese Patent Application No. 56-x579xotlc, the air-fuel mixture is transferred into the cylinder by using the negative pressure in the VI# cylinder that occurs as the piston descends. The natural supply line and the supercharging line forcibly supplying air pressurized by supercharging *iC to the The intake valve installed at the end of the natural intake system path is opened to introduce the air-fuel mixture from the natural intake system into the V9 engine, and the supercharging valve tmv* installed at the end of the supercharging system path is opened.
There is a system in which the valve is opened in the middle of the period when the honey valve is open, and pressurized static electricity is charged into the cylinder from the supercharging system. In this device, a check valve is installed in the supercharging system, and the supercharging valve is set to close later than the Km intake valve as shown in Fig. 1, thereby increasing the charging efficiency. It is.

ところが、この先行技術のものは、第２図に示すようＫ
、自然吸気系路に設けた混合観制御用スロットル弁ａが
全開になった時点からｆｉｌ紀過給系路４ｃ設けた給電
制御用スロットル弁わが開き始めるように設定している
ため、アクセル開度全島付近で出力が伸び悩むという問
題がある。すなわち、＠剣弁と過給弁の開成タイミング
をｔＩＩＪ１図に示すように設定したこの種のエンジン
において、自然吸気糸路のスロットル弁ａと過給系路の
スロットル弁すとの連動関係ケ第２図のよう圧すると、
過給領域（過給弁が開く領域）では、アクセル開度が大
きくなる１／（つれて過給系路における給電圧の増大と
共に空載量も増加するが、逆に、自然吸気系路からの混
合気、または空剣量は、該自然ｒＩ＆気糸路のスロット
ル弁ａがすでに全開になっていｂので、過給系路からの
充填によ１てシリンダ内の圧力が高まった分たけ減少す
るととになる。したがって、自然吸気糸路が杉糸路を流
れる空＊ｊｌに比例して燃料を増量していく燃料供給方
式（例えば、電化器のようにペンチエリ−負圧に対応し
て燃料の増減を図る方式）を採用している場合、自然吸
気系路と過給系路の両方からシリンダ内に供給される全
空気量の増派に対応させて燃料流量を変化させることが
できなくなる。つｔｂ、過給領域ではアクセル開度の増
大に伴ってシリンダ内に供給される混合気の空燃比がり
一ン化畑向を示すことになる。そのため、アクセル開度
全開では、全空電量は轡大するが空燃比が希薄化するた
め、出力の低下する状態となる。However, in this prior art, as shown in Figure 2,
Since the throttle valve for power supply control provided in the supercharging system path 4c is set to start opening from the time when the throttle valve a for controlling the mixture control provided in the natural intake system path is fully opened, the accelerator opening degree There is a problem that output is sluggish near the entire island. In other words, in this type of engine in which the opening timings of the sword valve and the supercharging valve are set as shown in Figure tIIJ1, the interlocking relationship between the throttle valve a of the natural intake line and the throttle valve S of the supercharging line is as follows. If you apply pressure as shown in Figure 2,
In the supercharging region (region where the supercharging valve opens), the accelerator opening increases by 1/(accordingly, as the supply voltage increases in the supercharging system, the unloaded capacity also increases, but conversely, from the naturally aspirated system Since the throttle valve a of the natural rI & airway is already fully open b, the air-fuel mixture or the amount of empty air decreases by the amount that increases the pressure inside the cylinder due to charging from the supercharging system. Therefore, a fuel supply method in which the naturally aspirated thread path increases the amount of fuel in proportion to the air *jl flowing through the cedar thread path (for example, in an electric appliance, the amount of fuel is increased in response to negative pressure) If a method in which the amount of air is increased or decreased) is adopted, it becomes impossible to change the fuel flow rate in response to an increase in the total amount of air supplied into the cylinder from both the natural intake system path and the supercharging system path. In the supercharging region, as the accelerator opening increases, the air-fuel ratio of the air-fuel mixture supplied into the cylinder tends to become uniform.Therefore, when the accelerator is fully open, the total air charge is Although it increases, the air-fuel ratio becomes leaner, resulting in a state in which the output decreases.

本発明は、このような事情に着目してなされたもので、
自然吸気系路に設けた空気または混合恒制（２）用スロ
フ）／し升が途中まで開いた時点からｉｉＩ記過給糸路
に設けた給奴制御用スロットル弁が開き始めるように設
定することによって、Ａｒ１述した不都合を解消するこ
とができるようにした過給機はエンジンを提供するもの
である。The present invention was made with attention to such circumstances, and
Set so that the feed control throttle valve provided in the superfeed yarn path described in iii. Accordingly, Ar1 provides a supercharger for an engine that can eliminate the above-mentioned disadvantages.

以下、本発明の一実施例を＠３図〜第６図を＃照して説
明する。An embodiment of the present invention will be described below with reference to FIGS. 3 to 6.

シリンダ１に対して自然吸気系路２と過給系路３と全独
立に設けている。自然吸気系路２け、ピストン番の降下
に伴って生じるシリンダｌ内の負圧を利用して混合気を
該シリンダｌ内に吸入するもので、一端が各ｙｙンダト
・・内に連通する吸気ポート５・・・と、この吸気ボー
ト５・・・のｆｔ１ｉをエアクリーナ６に連通さゼる吸
気通路７とを有してなる。そして、＊紀吸気ポート５・
・・の一端部には該吸気ボート５・・・を開閉する吸覧
弁８・・・が設けであるとともに、前記吸気通路７の途
中には電化器９と逆止弁ｌＯとをそれぞれ介挿している
。逆止弁ｌＯはリード弁と称されゐ構成のもので、Ｖリ
ンダ１方向への混合虹の流れのみをｉｌ！ＩＭＪさぜる
ようになっている。一方、過給系路３は、過給ａｌｌｌ
によって加圧ｊまた空佐をｉ■紀シリンダｌ内に強制的
に供給するもＪ）で、一端が前記シリンダト・・内ＫＮ
口する過給ボート１２・・・と、この過給ボート１２・
・・の他端ｆ前記エアクリーナ６に連通させる過給通路
１３とを有してなる。そして、Ｍｉｌ記過給ボート１２
の一端部に、該過給ボート１２・・・を開閉する過給弁
１４・・・ｉ設けている。なお、４１］紀吸剣弁８−・
は、油密の内燃機関と同様上死点近傍で開弁し、下孔点
をこえて欠し遅れる時期に閉弁するように設躍しである
のに対して、この過給弁１４・・・は、６１紀吸做力゛
８・・・が開いている船間の途中から開弁し、＠１１記
吸気升８・・・が閉じる時期よりも遅れて閉弁するよう
に設定しである。ｔｆｃ％齢紀過給通絡１ｓの途中に１
舘記過給機１１を介挿している。過給Ｊｌｌｌｌは、ク
ランクシャフトの回転力によって＠幀的に駆動される小
形エアーポンプであり、エンジン運転中は常時作動状態
となる。A natural intake system passage 2 and a supercharging system passage 3 are provided completely independently for the cylinder 1. The natural intake system has 2 passages, which sucks the air-fuel mixture into the cylinder 1 by using the negative pressure inside the cylinder 1 that occurs as the piston number descends, and one end communicates with each yy pipe. It has ports 5... and an intake passage 7 which communicates the ft1i of the intake boats 5... with the air cleaner 6. And *ki intake port 5・
An intake valve 8 for opening and closing the intake boat 5 is provided at one end of the intake boat 5, and an electrifier 9 and a check valve IO are provided in the middle of the intake passage 7, respectively. It's inserted. The check valve lO is called a reed valve, and only allows the mixed rainbow flow in one direction of the V cylinder. IMJ is starting to rustle. On the other hand, the supercharging system 3
Pressure is also forced into the cylinder I by J), so that one end is inside the cylinder KN.
The supercharged boat 12... and this supercharged boat 12...
The other end f has a supercharging passage 13 communicating with the air cleaner 6. And Mil supercharged boat 12
A supercharging valve 14...i for opening and closing the supercharging boat 12... is provided at one end. In addition, 41] Kikukenben 8-・
Unlike an oil-tight internal combustion engine, the supercharging valve 14 is designed to open near top dead center and close after a delay beyond the bottom hole point. ... is set so that the valve opens halfway between the ships where the 61st suction force 8... is open, and closes later than the time when intake chamber 8... in @11 is closed. It is. 1 in the middle of tfc% age supercharging connection 1s
A Tateki supercharger 11 is inserted. The supercharger is a small air pump driven by the rotational force of the crankshaft, and is always in operation during engine operation.

また、＊記過飴系路３の前記過給＃１Ｉｋｌｌよ）も下
流部分に給電量制御用のスロットｗ弁１５を介挿してい
す、そして、このスロットＡ’＊１５ｔｉ、前記に化ｕ
９の混合気制御用スロットル弁１６と連動機構２０を介
して相互＃Ｃ連結されている。連動優桐２０は、例えば
、賂４図に示すように１前記スロツトル鼾１６の支軸１
６ａの外周所要個所にアーム２０ａを突設すｂとともに
、このアーム２０ａの回動軌跡上に保合部ｓｏｂを有し
た回動筒２００を１記支軸１６ａの外周囲に軸心を一致
させて遊嵌させている。ｔた、との回動１ｉ２００に固
着した回動レバー！！Ｏｄの先端部を、１記スロツトル
弁１５の支軸１５ａの近傍・にまで延出さぜ＆を支軸１
５’ａの外周所要個所に突設したアーム２０ｅに係合さ
ゼている。そして、前記アーム２゜・を第１のスプリン
グ２０ｆ＃Ｃよ１てＩ！？Ｉ紀スロットル弁１５が開成
する方向に付勢するとともに、前記回動レバー２ｏｄを
前記スプリングａｏｆより４強力な第２のスプリング２
０ｇＫよａｍ紀スロットル弁１５が閉成する方向に付勢
するととによって、ｍ１記スロツトＶ弁１５を所定の閉
止位置に保持するよう和なっている。しかして、この連
動機構２０によれば、アクセルを開放位置から踏み込む
と、まず、気化器９のスロットル弁１６がそれに応動し
て矢印Ｘ方向に開き始め、該スロットル弁１６が、例え
ば、６０〜８０％開度になりた位置で前記スロットル弁
１６のアーム２０ａが１ｉＴ紀回動簡２０Ｑの係合部、
ｔｏｂ［当接する。そして、この位置からアク七〜をさ
らに踏み込むと前記回動筒２００が１ｉｆｔ記スロツト
ル弁１６の支−１６＆と一体になって矢印Ｘ方向に回動
を始め、前記回動レバー２０（１の先端部が図中上方へ
移行する。そのため、ＩＩＩ紀回動レバー２０ｄによ１
て□ 下方へ押圧されていたアームｇＯθが第１のスプリング
ｇｏｆＯ付勢力によって上方へ回動を開始し、過給系路
３のスロットル弁１１６が開き始める。In addition, a slot w valve 15 for controlling the power supply amount is inserted in the downstream part of the supercharger #1Ikll of the candy system path 3, and this slot A'*15ti is
#C is connected to the air-fuel mixture control throttle valve 16 of No. 9 via an interlocking mechanism 20. For example, as shown in FIG.
An arm 20a is provided protrudingly at a required location on the outer periphery of the arm 20a, and a rotating cylinder 200 having a retaining portion sob is aligned with the outer periphery of the support shaft 16a on the rotation locus of the arm 20a. It is loosely fitted. A rotating lever that is fixed to the rotating 1i200! ! Extend the tip of the Od to the vicinity of the spindle 15a of the throttle valve 15 mentioned above.
The arm 20e is engaged with an arm 20e that protrudes from a predetermined location on the outer periphery of the arm 5'a. Then, move the arm 2° to the first spring 20f#C1! ? A second spring 2 which is 4 stronger than the spring aof biases the rotational lever 2od in the direction in which the I-period throttle valve 15 is opened.
When 0gK biases the throttle valve 15 in the direction of closing, the m1 slot V valve 15 is held at a predetermined closed position. According to this interlocking mechanism 20, when the accelerator is depressed from the open position, the throttle valve 16 of the carburetor 9 first responds to this and begins to open in the direction of the arrow X. At the position where the opening degree is 80%, the arm 20a of the throttle valve 16 engages the engaging portion of the 1iT rotary member 20Q,
tob [abut; Then, when the actuator 7~ is further depressed from this position, the rotary cylinder 200 begins to rotate in the direction of the arrow part moves upward in the figure.Therefore, the
□ The arm gOθ, which had been pressed downward, begins to rotate upward due to the biasing force of the first spring gofO, and the throttle valve 116 of the supercharging system path 3 begins to open.

そして、前記スロットル弁１６が全開になった時点で１
記スロツト〜弁１６も全開位ｋＫ達するように１．てい
る（第５図参照）、換言すれば、前記スロッ）ル弁１５
は、高負萄域でのみ前記過給系路３を開路さぞるようＫ
なって働る。また、前記過給系路３の＃記スロット〜弁
１Ｂよ如も下流配分、例えば％骸過給系路易の各５ｙＩ
Ｊンダト・・への分岐通路部分である前記過給ボート１
２・−と前記過給通路１３との接合部に逆止弁１７−・
をそれぞれ介挿している。逆止弁１７は、リード弁と称
される構成のもので、Ｖリンダ１方向への空電の流れの
みを通過さぜるようにな１ている。また、この過給系路
ＳＶＣ，−記過給１１１１の吐出口１１ａから吐出され
ｂ空電を非過給時に該過給ｌ１ｌｌの吸入口ｘｘｂ近傍
傭へ帰還させるだめの制御手段１８を設けている。制一
手段１８は、前記過給機１１の吐出口１１５Ｌ近ＩＩ＠
と吸入口１１ｂ近傍伺とを連通させる連通路２１と、こ
の連通路２１に設けた連通路開閉用の制御弁！、ｔと、
この制御弁ａｍを駆動するためのダイヤフラム機構２３
とを具備してなる。連通路２１Ｆｉ、前記過給通路１３
の一部をなす吐出側チャンバ２４に隔壁２５）介して隣
接する吸入側チャンバ２６と、この吸入側チャンバ２６
をａ記過給機１１の吸入管１１ｂに連通さゼる空電流通
管路２７と、Ｍｉ？記隔壁２５に穿設されＩｉｌ紀吸入
偵チャンバ２６を前記吐出側チャンバ２４に連通させる
空気流通孔２８とから構成されている。また、制御弁２
２は、前記空気流通孔２８の吐出側チャンバ２４に面す
る開口端面に形成したシート面３１と、ＩＩ前記吐出側
チャンバ２４内に配設され６ｉ１配シー）［ｎ３１に対
して接離可能な弁体３２とを具備してなる−ので、この
弁体３２を…ｆ記ダイヤフフム榛横２３の作動棒２３ａ
により進退させるようＫしている。ダイヤフラム機構２
３ｉｌｉ、作動棒怠３ａを支持するダイヤフラム２３ｂ
の背面側に負圧導入ｗ１２３Ｃを形成してなる通常のも
ので、この負圧導入室２３０に導入される圧力に応じて
Ｕ紀作動棒２３ａが突没するようになっている。そして
、このダイヤフラム機構２３の負圧導入室２３０を、負
圧導入路３２１を介して前記過給系路３０ａｉｅスロッ
トル弁１５と前記逆止弁１７間に位置する部位に、連通
させている。Then, when the throttle valve 16 is fully opened, 1
1. Make sure that the slot to valve 16 also reach the fully open position kK. (see Fig. 5), in other words, the throttle valve 15
K so that the supercharging system path 3 is opened only in the high load region.
Become and work. In addition, the # slot of the supercharging system 3 to the valve 1B is also downstream distributed, for example, each 5yI of the supercharging system route
The supercharged boat 1 which is a branch passage section to J.D.
A check valve 17-- is installed at the junction between 2- and the supercharging passage 13.
are inserted respectively. The check valve 17 has a structure called a reed valve, and is configured to allow only the flow of static electricity in the V cylinder 1 direction to pass through. Further, a control means 18 is provided for returning the static electricity discharged from the discharge port 11a of the supercharging system SVC to the vicinity of the suction port xxb of the supercharging 1111 when not supercharging. . The control means 18 is located near the discharge port 115L of the supercharger 11
A communication passage 21 that communicates with the area near the suction port 11b, and a control valve for opening and closing the communication passage provided in this communication passage 21! , t and
Diaphragm mechanism 23 for driving this control valve am
It is equipped with. Communication path 21Fi, the supercharging path 13
A suction side chamber 26 adjacent to the discharge side chamber 24 which forms a part of the
Mi? The air passage hole 28 is formed in the partition wall 25 and communicates the first suction chamber 26 with the discharge chamber 24. In addition, control valve 2
2 is a sheet surface 31 formed on the opening end surface of the air circulation hole 28 facing the discharge side chamber 24; This valve body 32 is...
I am telling them to advance and retreat. Diaphragm mechanism 2
3ili, diaphragm 23b supporting the actuating rod 3a
This is a normal type in which a negative pressure introduction w123C is formed on the back side of the chamber 230, and the U period operating rod 23a is designed to protrude and retract according to the pressure introduced into the negative pressure introduction chamber 230. The negative pressure introduction chamber 230 of the diaphragm mechanism 23 is communicated with a portion of the supercharging system 30aie located between the throttle valve 15 and the check valve 17 via a negative pressure introduction path 321.

また、前記連通路２１を、前記切換弁２２よりも過給機
吸入側に位置する部位に前記切換弁２２の閉絡面積より
も狭小な通路面積を有した小径部を設けてなるもＯＫし
ている。具体的には、前記空電流通管路２７の内径Ａを
前記空気流通孔２８の開口径Ｂよ）も小さく設定し、こ
の空気流通管路２７を前記小径部としたものである。そ
して、山（記切換弁２２と前記小径部との闇、具体的に
け飾−記吸入側チャンバ２６ｋ、排慨浄化Ｊ＆ｉＸ次空
完供給径路３５の始端を開口させている。２次空気供給
径絡３６は、ｓ１紀吸入側チャンバ怠６を排慨系路３６
に連通させるもので、その途中には、排気系路３６方向
への空電の流れのみを通過さぜる逆止弁３）と、減速運
転時ｋｍｍ格絡５を閉路さぜるアフターパーン防止用の
開閉弁３８が介挿されている。It is also OK to provide the communication passage 21 with a small diameter portion having a narrower passage area than the closed area of the switching valve 22 at a portion located closer to the supercharger suction side than the switching valve 22. ing. Specifically, the inner diameter A of the empty current passage conduit 27 is also set smaller than the opening diameter B of the air circulation hole 28, and this air circulation conduit 27 is defined as the small diameter portion. The gap between the switching valve 22 and the small diameter section, specifically the suction side chamber 26k, and the starting end of the exhaust purification J&iX secondary empty supply path 35 are opened.Secondary air supply The meridian 36 connects the s1 suction side chamber 6 to the exhaust system 36.
On the way, there is a check valve 3) that only allows the flow of static electricity to pass in the direction of the exhaust system path 36, and an afterburn prevention valve that closes the km grid 5 during deceleration operation. An on-off valve 38 for use is inserted.

なお、嘉９は、−記吐出側チ中ンパ２４と吸人傭チャン
バ２６との関に設けたリリーフ弁である。このリリーフ
弁３９は従来のシステムに使用されているリリーフ弁と
同様な機能を有するものであり、前記吐出側チャンバ２
４内の給気圧が設定鎮圧以上の高い値に達した場合に開
成するようＶ（なりている、また、燃料供給装置として
は、嬉３図に示すような自然吸気系路側に燃料吐出用ノ
ズルを有するキャブレタ一方式で、過給圧力に応じて燃
料を増減させる補助機構を設けた本のである。Note that the reference numeral 9 is a relief valve provided at the junction between the discharge side chamber 24 and the suction chamber 26. This relief valve 39 has the same function as a relief valve used in a conventional system, and is connected to the discharge side chamber 2.
4 is set to open when the supply pressure in the cylinder reaches a high value higher than the set suppression pressure.In addition, the fuel supply system is equipped with a fuel discharge nozzle on the road side of a naturally aspirated system as shown in Figure 3. This is a one-type carburetor with an auxiliary mechanism that increases or decreases fuel according to boost pressure.

このような構成のものであれば、自然吸気系路２に設け
た混合気制御用スロワ）＆弁１６が途中まで開いた時点
から過給系路３に設けた給気制御用スロワ）Ａ／弁１５
が開き始め、過給が開始されることになる。そのため、
過給領域においても、自然吸気系路２のスロットル弁１
６の開度はアクセル開度に対応して変化することになる
。したが１ って、過給系路３のスロットル弁ＩＩｓが開き始めるこ
とにより、過給系路３からの給電量に対する自然吸気系
路２からの吸気蓋の割合が低下するととは避けられない
にしても、過給系路３のスロットル弁１５の開度増加と
ともに自然吸気糸路２のスロワ）ル弁１６の開度屯増大
するため、自然吸気系路２の気化器９にアクセル開度全
開付近での蛤料増′ｋｋ機能を持たせることが容易とな
る。すなわち、過給領域において本アクセル開埃に応じ
て４Ｉ＋紀譬化器９のベンチＪＬ９−圧力が変化するの
マ、その圧力変化に関連さぞて作動する補助機構により
燃料増量を図ることが比較的容易となる。そσ〕ため、
病６図に示すようＫ、先行技術のもの（実線１参１！ｔ
１）は、過給領域Ａにおいてシリンダ１内へ供給されろ
混合気の空燃比が極端にリーン化傾向を示すことになる
のに対して、本究明のエンジン（破線ｍ参照）では、ア
クセル全開付近で空燃比がリーンになるという傾向側抑
制して出力の低下を防止することができｂものである。If it has such a configuration, from the time when the air-fuel mixture control thrower provided in the natural intake system path 2) & the air-fuel mixture control thrower provided in the supercharging system path 3) A/ valve 15
will begin to open and supercharging will begin. Therefore,
Even in the supercharging region, the throttle valve 1 of the naturally aspirated system passage 2
The opening degree of No. 6 changes in accordance with the accelerator opening degree. Therefore, as the throttle valve IIs of the supercharging system path 3 begins to open, it is inevitable that the ratio of the intake lid from the natural intake system path 2 to the amount of power supplied from the supercharging system path 3 will decrease. However, as the opening of the throttle valve 15 of the supercharging system passage 3 increases, the opening of the throttle valve 16 of the natural intake line passage 2 also increases, so that the accelerator opening of the carburetor 9 of the natural intake passage 2 increases. It is easy to provide the function of increasing the amount of water when the engine is fully opened. In other words, in the supercharging region, the 4I+pressure of the bench JL9 of the accelerator 9 changes in response to the opening of the accelerator, and it is relatively easy to increase the amount of fuel using the auxiliary mechanism that operates in response to the pressure change. It becomes easier. Therefore,
As shown in Figure 6, K, the prior art (solid line 1 reference 1!t
1), the air-fuel ratio of the air-fuel mixture supplied to cylinder 1 tends to be extremely lean in supercharging region A, whereas in the engine of this study (see broken line m), the accelerator is fully opened. It is possible to prevent a decrease in output by suppressing the tendency of the air-fuel ratio to become lean in the vicinity.

第６図における一点＃ＩＡ紳ｎは過給を全く行なわない
場合の特性を示した本のであ諷が、本発明のエンジンで
は、観化器９の補助機構の調整によりこの特性（一点鎖
線ｎ）に近い空燃比特性を発揮させることも壇能である
。The point #IA n in Fig. 6 is a slander from a book that shows the characteristics when no supercharging is performed at all, but in the engine of the present invention, this characteristic (dotted chain line n ) is also an advantage.

なお、前記実施例では、自然吸気系路のスロットル弁と
過給糸路のスロットル弁とが同時に全開になるように設
定した場合について説明したが、本発明はかならずしも
このような本のに限られないのは勿論であり、例えば、
第７図に示すようＫ、過給系路のスロットル弁が自然＠
気系路のスロットル弁よプも若干遅れて全開になるよう
（設定してもよい、しかして、このようにすれは、第６
図に示す実線ｌの特性と破＠ｍの特性との中間の空燃比
特性が得られるものである。In addition, in the above embodiment, the case where the throttle valve of the natural intake system path and the throttle valve of the supercharging path were set to be fully open at the same time was explained, but the present invention is not necessarily limited to such a book. Of course there is no such thing, for example,
As shown in Figure 7, K, the throttle valve of the supercharging system is
The throttle valve in the air system path can also be set to fully open with a slight delay.
An air-fuel ratio characteristic intermediate between the characteristic indicated by the solid line l and the characteristic indicated by the broken line m shown in the figure is obtained.

また、自然吸気系路のスロットＪ％／升と過給系路のス
ロットル弁とを連動さぜるためのｍ構も前記実施例のも
のに限られず、本発明の趣旨を逸脱しない範囲で檎々変
形がｉＪ能である。Further, the m structure for interlocking the slot J%/square of the natural intake system path and the throttle valve of the supercharging system path is not limited to that of the above embodiment, and may be modified without departing from the spirit of the present invention. The various variations are iJ Noh.

以上、説明［７たように、本発明は、自然＠虹糸絡に設
けた空＊Ｃまたは混合気制御用スロワ）＆弁が途中まで
開いた時点から帥紀過給系絡に設けた給気制御用スロッ
トル弁が開き始めるように設定しているので、アクセル
開度全開付近ＪＩＣ１？ケる混合気の空燃比のリーン化
傾向を有効に防止して出力の低下を防、ぐことかできる
過給機付エンジンを提供できるものである。As explained above, the present invention is based on the air supply provided in the natural @ rainbow thread connection or the air-fuel mixture control thrower) and the air-fuel mixture provided in the supercharging system connection from the time when the valve is opened halfway. Since the throttle valve for air control is set to start opening, the accelerator opening is near full-open JIC1? Therefore, it is possible to provide a supercharged engine that can effectively prevent the tendency of the air-fuel ratio of the air-fuel mixture to become lean, thereby preventing a decrease in output.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図、第２図は従来例を示し、第１図はパルプタイミ
ングを表わす図、第２図はスロットＩし弁の開度特性を
示す図であゐ。第３図〜第６図は本発明の一実施例を示
し、＠３図は概略断面図、第４図は部分説明図、第５図
はスロットル弁の開度特性を示す図、＠６図は空燃比特
性を示す図である。第７図は本発明の他の実施例を示す
スμ。 トシ弁の開度特性図である。 １−・・シリンダ　２−・自然吸気系路　３・・・過給
糸路４・・・ピストン　１１−ｉ＠１給＠１５・・・過
給糸路のスロットル弁　１６−自然吸気系路のスロット
ル弁 代理人　弁理士　赤澤−博1 and 2 show a conventional example, with FIG. 1 showing the pulp timing, and FIG. 2 showing the opening characteristics of the slot I valve. Figures 3 to 6 show an embodiment of the present invention, Figure @3 is a schematic sectional view, Figure 4 is a partial explanatory diagram, Figure 5 is a diagram showing the opening characteristics of the throttle valve, Figure @6 is a diagram showing air-fuel ratio characteristics. FIG. 7 is a diagram showing another embodiment of the present invention. It is an opening characteristic diagram of a Toshi valve. 1-...Cylinder 2-Natural intake system path 3...Supercharge line path 4...Piston 11-i@1 [email protected] valve of supercharge line path 16-Natural intake line path Throttle valve agent Patent attorney Hiroshi Akazawa

Claims (1)

【特許請求の範囲】[Claims] ピストンの降下に伴１て生じゐシリンダ内の負圧を利用
して混合賦を該Ｖ′＠ンダ内に吸入させる自然吸気系路
と、過給機によって加圧した空気を＠　ｒｃ！シリンダ
内に供給すゐ過給系路とをそれぞれ独立に設けてなる過
給機付エンジンにおいて、前記自然吸気系路に設けた空
気または混合気制椀用スロットル弁が途中まで開いた時
点から前記過給系路に設けた給電制御用スｐツ）＆弁が
開き始めるように設定［７たことを特徴とする過給機付
コーンジン。There is a natural intake system path that uses the negative pressure inside the cylinder that is generated as the piston descends to draw the mixture into the V' cylinder, and a natural intake system that draws air pressurized by the supercharger into the cylinder. In a supercharged engine in which a supercharging system and a supercharging system for supplying the air into the cylinder are independently provided, from the time when the throttle valve for air or mixture control provided in the naturally aspirated system is opened halfway, A corn gin with a supercharger characterized by having a power supply control spout installed in the supercharging system line and a valve set so that it starts to open.