JPH01147150A - Variable venturi carburetor - Google Patents
Variable venturi carburetorInfo
- Publication number
- JPH01147150A JPH01147150A JP30566887A JP30566887A JPH01147150A JP H01147150 A JPH01147150 A JP H01147150A JP 30566887 A JP30566887 A JP 30566887A JP 30566887 A JP30566887 A JP 30566887A JP H01147150 A JPH01147150 A JP H01147150A
- Authority
- JP
- Japan
- Prior art keywords
- main
- main jet
- fuel
- control valve
- air control
- 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
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 241000234435 Lilium Species 0.000 claims 6
- 239000006200 vaporizer Substances 0.000 claims 1
- 239000000446 fuel Substances 0.000 abstract description 33
- 239000000203 mixture Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Landscapes
- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、可変ベンチュリ気化器に係り、制御弁の動き
に応じて、メインノズルより燃料が噴出するように好適
な可変ベンチュリ気化器に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a variable venturi carburetor, and more particularly, to a variable venturi carburetor suitable for ejecting fuel from a main nozzle in accordance with the movement of a control valve. It is.
従来の装置は、特開昭６２−３８８６２号に記載のよう
に空気制御弁の燃料制御として、空気制御弁上流に設置
された第２メインノズルより燃料が噴出されるが燃料が
噴出したら急激に過濃混合比となり適正混合比が得られ
ない問題がある。In the conventional device, as described in JP-A No. 62-38862, fuel is injected from a second main nozzle installed upstream of the air control valve to control the fuel of the air control valve. There is a problem in that the mixing ratio becomes too concentrated and an appropriate mixing ratio cannot be obtained.
上記従来技術は、空気制御弁が開く（空気量が大きくな
る）につれて混合気は薄くなるため、これを補うために
作用する空気制御弁の上流に第２メインノズルを設置し
ている。燃料の噴出時期は、メインノズルの突出量で選
定しているが、絞弁全開域の混合比を主に選定すると空
気制御弁が開く前に燃料が噴出し高負荷、高回転で過濃
混合比の領域がでてくる。また燃料が噴出したら他の通
路との引き合いがないため、−気に過濃混合比となる傾
向があり、空気制御弁に応じて適正な混合比の供給が不
可能である。In the above-mentioned prior art, the air-fuel mixture becomes thinner as the air control valve opens (the amount of air increases), so the second main nozzle is installed upstream of the air control valve to compensate for this. The timing of fuel injection is determined by the amount of protrusion of the main nozzle, but if the mixture ratio is mainly selected in the throttle valve fully open range, the fuel will be ejected before the air control valve opens, resulting in an over-rich mixture at high loads and high rotations. A ratio area appears. Further, once the fuel is ejected, there is no interaction with other passages, so the mixture ratio tends to be too rich, making it impossible to supply an appropriate mixture ratio according to the air control valve.
本発明の目的は、空気制御弁の開きに応じて、第２メイ
ンノズルからの燃料を適正に供給することかできる可変
ベンチュリ気化器を提供することにある。An object of the present invention is to provide a variable venturi carburetor that can appropriately supply fuel from a second main nozzle depending on the opening of an air control valve.
上記目的は、空気制御弁の上流に設置された第２メイン
ノズルの混合比制御を第２メインノズル下部に常時開口
する第２メインジェットとこれと並例に第３メインジェ
ットを具備し、この第３メインジェットをスロットル連
動の機械式または負圧応動式により制御させる。これに
より第２メインノズルからの燃料は一気に過濃混合比に
なることはなく、空気制御弁の開きに応じて適正な混合
比が得られ、燃費低減、運転性向上が得られる。The above purpose is to control the mixture ratio of the second main nozzle installed upstream of the air control valve by providing a second main jet that is always open at the bottom of the second main nozzle and a third main jet in parallel with this. The main jet is controlled by a throttle-linked mechanical system or a negative pressure responsive system. As a result, the fuel from the second main nozzle does not suddenly reach an excessively rich mixture ratio, and an appropriate mixture ratio can be obtained depending on the opening of the air control valve, resulting in reduced fuel consumption and improved drivability.
ベンチュリ負圧を駆動源とするアクチュエータによって
空気制御弁の回転角度を制御する可変ベンチュリ気化器
は、機関が低速運転から高速運転になるにつれ、すなわ
ち空気制御弁が順々に開いていく、これに応じ空気制御
弁の上流に設けた第２メインノズルからの燃料は、空気
制御弁の開きが少ない時は、第２メインノズル下部に常
時開口する第２メインジェットにより計量され、さらに
空気制御弁の開きが大きくなると第３メインジェットが
開口されるため、空気制御弁の開きに応じ第２メインノ
ズルからの燃料補正は低速運転から高速運転域まで適正
な混合比を得ることができる。A variable venturi carburetor uses an actuator driven by venturi negative pressure to control the rotation angle of the air control valve. The fuel from the second main nozzle installed upstream of the air control valve is metered by the second main jet, which is always open at the bottom of the second main nozzle, when the air control valve is not fully opened. As the third main jet becomes larger, the third main jet is opened, so that fuel correction from the second main nozzle can be performed in accordance with the opening of the air control valve to obtain an appropriate mixture ratio from low speed operation to high speed operation range.
以下、本発明の一実施例を第１図により説明する。低速
運転域では絞弁１が所定開度になるまでは、空気制御弁
２は所定開度値にあり、ベンチュリ３の通気面積は一定
とし作用している。高速運転域になり、絞弁１が所定開
度以上となると空気量が増えるにつれ、ベンチュリ部３
壁面に突出したベンチュリ負圧取出口４の負圧が高くな
り、この負圧を駆動源とするアクチュエータ５によって
リンク６を介して空気制御弁２の回転角度を制御して機
関が高速運転状態になるほどベンチュリ部３の吸気通路
面積を増加する様に制御する。この空気制御弁２の燃料
補正としては、空気制御弁２の上流に設置した第２メイ
ンノズル７からの燃料である。従来は空気制御弁２の作
動開度範囲の燃料補正は、第２メインノズル７下部に常
時開口する第２メインジェット８からの燃料補正であり
、空気制御弁２の開度が最大の高速域の空燃比を満たす
ためには、第２メインジェット８径は大きく選定せざる
を得ない。この第２メインジェット８径が大きいのと他
の負圧との引合いがないため、第２メインノズル７から
の燃料出始めは一気に噴出し過濃混合比となり、また空
気制御弁２が最大開度では燃料補正不足により稀薄混合
比になり機関の要求する混合比が得られなく性能が成り
立たない。本発明は第２メインノズル７の燃料補正を第
２メインノズル７下部に常時開口する第２メインジェッ
ト８とこれと並例に第３メインジェット９を具備し、こ
の第３メインジェット９を絞弁の連動により制御するも
のである。空気制御弁２の開きが少ない領域では第２メ
インジェット８により燃料を補正し、空気制御弁２の開
き多くなる絞弁１の開度が所定以上になると絞弁１と連
動して作動する加速ピストン１ｏの下部に設置したニー
ドルバルブ１１が加速ビス１−ン１ｏ下部により押し下
げられニードルバルブ１１が開口する。燃料はフロート
室１２より燃料通路１３からニードルバルブ１１を通り
第２メインジェット８と並例につなぐ燃料通路１４内に
設置された第３メインジェット９で計量され、第２メイ
ンジェット８と合成され、第２メインエアーブリード１
５と混合し、第２メインノズル７より噴出される。An embodiment of the present invention will be described below with reference to FIG. In the low-speed operating range, the air control valve 2 is at a predetermined opening value until the throttle valve 1 reaches a predetermined opening value, and the venturi 3 operates with a constant ventilation area. In the high-speed operation range, when the throttle valve 1 reaches a predetermined opening degree or more, as the amount of air increases, the venturi section 3
The negative pressure at the venturi negative pressure outlet 4 protruding from the wall increases, and the actuator 5, which uses this negative pressure as a driving source, controls the rotation angle of the air control valve 2 via the link 6, and the engine enters a high-speed operating state. I see that the intake passage area of the venturi section 3 is controlled to be increased. The fuel correction for the air control valve 2 is fuel from the second main nozzle 7 installed upstream of the air control valve 2. Conventionally, the fuel correction in the operating opening range of the air control valve 2 is the fuel correction from the second main jet 8 that is always open at the bottom of the second main nozzle 7, and the fuel correction in the operating opening range of the air control valve 2 is the fuel correction from the second main jet 8 that is always open at the bottom of the second main nozzle 7. In order to satisfy the air-fuel ratio, the diameter of the second main jet 8 must be selected to be large. Since the diameter of the second main jet 8 is large and there is no interaction with other negative pressures, the fuel starts to come out from the second main nozzle 7 all at once, resulting in a rich mixture ratio, and the air control valve 2 is opened at its maximum opening. In this case, due to insufficient fuel correction, the mixture ratio becomes lean and the mixture ratio required by the engine cannot be obtained, resulting in poor performance. The present invention comprises a second main jet 8 that is always open at the bottom of the second main nozzle 7 and a third main jet 9 for correcting the fuel of the second main nozzle 7. It is controlled by In a region where the air control valve 2 is less open, the second main jet 8 corrects the fuel, and when the air control valve 2 opens more and the opening of the throttle valve 1 exceeds a predetermined value, an accelerating piston operates in conjunction with the throttle valve 1. The needle valve 11 installed at the lower part of the accelerating screw 1o is pushed down by the lower part of the acceleration screw 1o, and the needle valve 11 opens. The fuel is metered from the float chamber 12 by the third main jet 9 installed in the fuel passage 14 which passes through the fuel passage 13 through the needle valve 11 and connects with the second main jet 8, and is combined with the second main jet 8. Main air bleed 1
5 and is ejected from the second main nozzle 7.
〔発明の効果〕
本発明により、空気制御弁２の開きに応じ第２メインノ
ズル７からの燃料は２段階に補正されるため、低速運転
域から高速運転域まで混合比の適正化ができる。これに
より第２図の実線に示す如く、過濃混合比現象を解消す
ることができる。[Effects of the Invention] According to the present invention, the fuel from the second main nozzle 7 is corrected in two stages according to the opening of the air control valve 2, so that the mixture ratio can be optimized from a low speed operating range to a high speed operating range. This makes it possible to eliminate the over-rich mixture ratio phenomenon, as shown by the solid line in FIG.
第１図は本発明実施例の断面図、第２図は本発明の効果
を示す図である。
１・・・絞弁、２・・・空気制御弁、３・・・ベンチュ
リ部、４・・・ベンチュリ取出口、５・・・アクチュエ
ータ、６・・・リンク、７・・・第２メインノズル、８
・・・第２メインジェット、９・・・第３メインジエッ
１−１１０・・・加速ピストン、１１・・・ニードルバ
ルブ、１３．１４・・・燃料通路、１５・・・第２メイ
ンエアブリード。FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a diagram showing the effects of the present invention. DESCRIPTION OF SYMBOLS 1... Throttle valve, 2... Air control valve, 3... Venturi part, 4... Venturi outlet, 5... Actuator, 6... Link, 7... Second main nozzle , 8
...Second main jet, 9...Third main jet 1-110...Acceleration piston, 11...Needle valve, 13.14...Fuel passage, 15...Second main air bleed.
Claims (1)
これに対面する吸気通路壁面とによつてベンチユリ部を
形成すると共に、前記ベンチユリの最狭部に第１メイン
ノズルを位置させ、空気制御弁の空気流の上流側に第２
メインノズルを位置する可変ベンチユリ気化器において
、第２メインノズル下部に常時開口する第２メインジェ
ットとこれと並例に第３メインジェットを具備し、この
第３メインジェットを制御することを特徴とする可変ベ
ンチユリ気化器。 ２、前記第３メインジェットの制御をスロットル連動の
機械式で作動させることを特徴とする特許請求の範囲第
１項記載の可変ベンチユリ気化器。 ３、前記第３メインジェットを負圧応動式で作動させる
ことを特徴とする特許請求の範囲第１項記載の可変ベン
チユリ気化器。[Scope of Claims] 1. A bench lily portion is formed by an air control valve rotatably mounted in the intake passage and a wall surface of the intake passage facing the air control valve, and a first valve is provided at the narrowest part of the bench lily. The main nozzle is located, and the second nozzle is located upstream of the air flow of the air control valve.
A variable bench lily carburetor in which a main nozzle is located, the variable bench lily comprising a second main jet that is always open at the bottom of the second main nozzle and a third main jet in parallel with the second main jet, and controlling the third main jet. vaporizer. 2. The variable bench lily carburetor according to claim 1, wherein the third main jet is controlled mechanically in conjunction with a throttle. 3. The variable bench lily carburetor according to claim 1, wherein the third main jet is operated in a negative pressure responsive manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30566887A JPH01147150A (en) | 1987-12-04 | 1987-12-04 | Variable venturi carburetor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30566887A JPH01147150A (en) | 1987-12-04 | 1987-12-04 | Variable venturi carburetor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01147150A true JPH01147150A (en) | 1989-06-08 |
Family
ID=17947911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30566887A Pending JPH01147150A (en) | 1987-12-04 | 1987-12-04 | Variable venturi carburetor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01147150A (en) |
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-
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- 1987-12-04 JP JP30566887A patent/JPH01147150A/en active Pending
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