JPS60192866A - Variable venturi type carburetor - Google Patents
Variable venturi type carburetorInfo
- Publication number
- JPS60192866A JPS60192866A JP4811984A JP4811984A JPS60192866A JP S60192866 A JPS60192866 A JP S60192866A JP 4811984 A JP4811984 A JP 4811984A JP 4811984 A JP4811984 A JP 4811984A JP S60192866 A JPS60192866 A JP S60192866A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- throttle valve
- negative pressure
- piston
- diaphragm chamber
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M7/00—Carburettors with means for influencing, e.g. enriching or keeping constant, fuel/air ratio of charge under varying conditions
- F02M7/12—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves
- F02M7/14—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves with means for controlling cross-sectional area of fuel spray nozzle
- F02M7/16—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves with means for controlling cross-sectional area of fuel spray nozzle operated automatically, e.g. dependent on exhaust-gas analysis
- F02M7/17—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves with means for controlling cross-sectional area of fuel spray nozzle operated automatically, e.g. dependent on exhaust-gas analysis by a pneumatically adjustable piston-like element, e.g. constant depression carburettors
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、ピストン弁がベンチュリ部の負圧に応動して
上下動するようにした可変ベンチュリ式気化器の改良に
関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a variable venturi type carburetor in which a piston valve moves up and down in response to negative pressure in a venturi section.
可変ベンチュリ式気化器は、ベンチュリ部を横切るよう
にピストン弁を設け、そのピストン弁がベンチュリ部に
発生する負圧に応動して上下動し、ベンチュリ部の流路
断面積を変化させる構成になっている。このようにピス
トン弁の上下動制御が、ベンチュリ部に発生する負圧の
みに依存しているため、加速初期におけるエンジン回転
数が低く、かつベンチュリ部の負圧が十分に発生しない
ときには、ピストン弁を速やかに上昇させることができ
ないという特性を有している。このような特性のため、
可変ベンチュリ式気化器では、加速初期にその加速に必
要な十分な空気をエンジンに供給することができず、そ
のため敏速な加速が行えないという欠点がある。A variable venturi type carburetor has a piston valve installed across the venturi section, and the piston valve moves up and down in response to the negative pressure generated in the venturi section, changing the cross-sectional area of the flow path in the venturi section. ing. In this way, the vertical movement control of the piston valve depends only on the negative pressure generated in the venturi section, so when the engine speed is low at the beginning of acceleration and sufficient negative pressure is not generated in the venturi section, the piston valve It has the characteristic that it cannot be raised quickly. Because of these characteristics,
The variable venturi carburetor has the disadvantage that it cannot supply sufficient air to the engine necessary for acceleration at the beginning of acceleration, and therefore cannot perform rapid acceleration.
本発明の目的は、加速初期の応答性を良好にした可変ベ
ンチュリ式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 with good responsiveness in the initial stage of acceleration.
上記目的を達成するための本発明は、ベンチュリ部にこ
のベンチュリ部を横切るピストン弁を設け、このピスト
ン弁の上部に前記ベンチュリ部と連通するダイヤフラム
室を設け、このダイヤフラム室の負圧変化により前記ピ
ストン弁の位置を制御すべくすると共に、前記ベンチュ
リ部に連通ずる空気通路に絞り弁を設けた可変ベンチュ
リ式気化器において、前記絞り弁の下流側に、その下流
側の負圧を抽出貯留する空気室を接続し、この空気室を
前記絞り弁が大きな絞り状態のとき閉弁状態である開閉
弁を介して前記ダイヤフラム室に連通させ、前記開閉弁
を前記絞り弁の一定以上の開度又は開速度に応動して開
弁すべくしたことを特徴とするものである。In order to achieve the above object, the present invention provides a venturi section with a piston valve that crosses the venturi section, a diaphragm chamber that communicates with the venturi section above the piston valve, and a negative pressure change in the diaphragm chamber. In a variable venturi type carburetor which is designed to control the position of a piston valve and is provided with a throttle valve in an air passage communicating with the venturi part, negative pressure on the downstream side of the throttle valve is extracted and stored on the downstream side of the throttle valve. An air chamber is connected to the diaphragm chamber, and this air chamber is communicated with the diaphragm chamber via an on-off valve that is closed when the throttle valve is in a large throttle state, and the on-off valve is connected to the opening of the throttle valve above a certain level or The valve is opened in response to the opening speed.
以下、本発明を図に示す実施例により説明する。 The present invention will be explained below with reference to embodiments shown in the drawings.
第１図において、１は空気通路であり、この空気流路ｌ
の上流側から、矢印Ａのように不図示の空気清浄器から
空気が供給され、この気化器内で形成された混合気が、
下流側から矢印Ｂのように不図示のエンジンへ供給され
るようになっている。In FIG. 1, 1 is an air passage, and this air passage l
Air is supplied from an air purifier (not shown) from the upstream side of the carburetor as shown by arrow A, and the air-fuel mixture formed in this carburetor is
It is supplied to an engine (not shown) from the downstream side as indicated by arrow B.
上記空気流路１のベンチュリｇｒＳ３に対応してピスト
ン弁２が上下に摺動自在に設けられ、このピストン弁２
の上下動によりベンチュリ部３の流路断面積が変化する
ようになっている。このピストン弁２の上端には、連通
孔２ａを介してベンチュリ部３と連通するダイヤフラム
室４が設けられ、このダイヤフラム室４の負圧変化（す
なわち、ベンチュリ部３の負圧変化）に応動してベンチ
ュリ弁２が上下動するようになっている。ベンチュリ部
３には燃料噴射ノズル５が臨み、その燃料噴射ノズル５
にはピストン弁２に固定した針弁６が挿入されている。A piston valve 2 is provided so as to be slidable up and down corresponding to the venturi grS3 of the air flow path 1, and this piston valve 2
The cross-sectional area of the flow path of the venturi section 3 changes due to the vertical movement of the venturi section 3. A diaphragm chamber 4 is provided at the upper end of the piston valve 2 and communicates with the venturi section 3 through a communication hole 2a. The venturi valve 2 is configured to move up and down. A fuel injection nozzle 5 faces the venturi section 3, and the fuel injection nozzle 5
A needle valve 6 fixed to the piston valve 2 is inserted into the piston valve 2 .
針弁６はピストン弁２と共に上下動することにより、燃
料噴射ノズル５の開口面積を変化させ、その燃料噴射ノ
ズル５からの燃料噴射量を調節するようになっている。The needle valve 6 moves up and down together with the piston valve 2 to change the opening area of the fuel injection nozzle 5 and adjust the amount of fuel injected from the fuel injection nozzle 5.
ベンチュリ弁２の下流側には絞り弁７が設けられ、この
絞り弁７の開度により空気流路１の空気流量が調節され
るようになっている。この絞り弁７の下流側に連通路８
の一端が開口するように接続され、その連通路８の他端
に逆止弁９を介して空気室１０が設けられている。この
空気室１０は、上記逆止弁９を介して絞り弁７の下流か
ら負圧を抽出して貯留するようになっている。A throttle valve 7 is provided downstream of the venturi valve 2, and the air flow rate of the air passage 1 is adjusted by the opening degree of the throttle valve 7. A communication passage 8 is provided on the downstream side of this throttle valve 7.
are connected so that one end thereof is open, and an air chamber 10 is provided at the other end of the communication path 8 via a check valve 9. This air chamber 10 extracts negative pressure from downstream of the throttle valve 7 via the check valve 9 and stores it therein.
上記空気室１０は、さらに連通路１１により常閉の電磁
弁からなる開閉弁１２を介して上記ダイヤフラム室４に
連通ししている。この開閉弁１２は常閉であるため、上
記絞り弁７の絞りが大きな状態においても閉弁状態であ
り、上記絞り弁７の軸部に設けたセンサ１３の検知信号
により開弁を行うようになっている。このセンサ１３は
、絞り弁７の開度又は開速度が一定以上になったとき、
すなわち加速操作を行ったときに検出信号を出し、上記
開閉弁１２を開弁する。この加速操作に伴う開閉弁１２
の開弁により、空気室１０とダイヤフラム室４とは連通
状態となり、空気室１０に貯留されていた負圧がダイヤ
フラム室４に導入されるため、その負圧によりピストン
弁２は敏速に上昇を行う。The air chamber 10 further communicates with the diaphragm chamber 4 via a communication passage 11 and an on-off valve 12 which is a normally closed electromagnetic valve. Since this opening/closing valve 12 is normally closed, it remains closed even when the throttle valve 7 has a large throttle, and is opened by a detection signal from a sensor 13 provided on the shaft of the throttle valve 7. It has become. This sensor 13 detects when the opening degree or opening speed of the throttle valve 7 exceeds a certain level.
That is, when an acceleration operation is performed, a detection signal is output, and the on-off valve 12 is opened. Opening/closing valve 12 accompanying this acceleration operation
When the valve is opened, the air chamber 10 and the diaphragm chamber 4 are brought into communication, and the negative pressure stored in the air chamber 10 is introduced into the diaphragm chamber 4, so that the piston valve 2 is quickly raised due to the negative pressure. conduct.
上述のように上記可変ベンチュリ式気化器によると、絞
り弁７下流側から抽出されて空気室１０に貯留されてい
た負圧が、加速操作の初期に開閉弁１２を介してダイヤ
フラム室４に導入され、ピストン弁２を敏速に上昇させ
る。そのため、従来の可変ベンチュリ式気化器のように
ピストン弁の上昇遅れを発生することはない。As described above, according to the variable venturi type carburetor, the negative pressure extracted from the downstream side of the throttle valve 7 and stored in the air chamber 10 is introduced into the diaphragm chamber 4 via the on-off valve 12 at the beginning of the acceleration operation. and quickly raises the piston valve 2. Therefore, unlike the conventional variable venturi type carburetor, there is no delay in the rise of the piston valve.
したがって、加速に必要な空気がエンジンに速やかに供
給され、敏速な加速を行うことができる。Therefore, the air necessary for acceleration is quickly supplied to the engine, and rapid acceleration can be achieved.
第２図は、本発明の他の実施例を示すものである。FIG. 2 shows another embodiment of the invention.
この実施例は、開閉弁１２を開弁するための信号として
、上記第１の実施例におけるセンサ１３の絞り弁開度又
は開速度だけでなく、さらにエンジン回転数が一定以上
であることを検知するセンサ１４を設け、この両センサ
１３，１４の信号により、加速初期に一層適切なタイミ
ングで負圧をダイヤフラム室４に負荷させ、ピストン弁
２を敏速に上昇させるようにしている。This embodiment detects not only the opening degree or opening speed of the throttle valve of the sensor 13 in the first embodiment as a signal for opening the on-off valve 12, but also detects that the engine rotation speed is above a certain level. A sensor 14 is provided, and based on the signals from both sensors 13 and 14, negative pressure is applied to the diaphragm chamber 4 at a more appropriate timing in the early stage of acceleration, thereby causing the piston valve 2 to rise quickly.
二つのセンサ１３．１４の信号は、制御ユニット１５の
インタフェイス■６に入力され、演算処理部１７および
記憶部１８に基づき処理され、その出力を駆動部１９か
ら電磁弁である開閉弁１２へ指令するようにしている。The signals from the two sensors 13 and 14 are input to the interface 6 of the control unit 15, processed based on the arithmetic processing section 17 and the storage section 18, and the output is sent from the drive section 19 to the on-off valve 12, which is a solenoid valve. I try to give instructions.
上記制御ユニット１５における信号処理は、第３図に示
すフローチャートのように行われ、開閉弁１２の開弁は
エンジンの回転数が一定値以上で、かつ絞り弁７が急に
一定以上の開度又は開速度で開いたときに行われ、また
閉弁は絞り弁７が閉じられたとき、または開閉弁１２に
対する連続通電時間が長いとき、またはエンジン回転数
が高くなりすぎたときに行われる。The signal processing in the control unit 15 is performed as shown in the flowchart shown in FIG. Alternatively, the valve is closed when the throttle valve 7 is closed, when the on-off valve 12 is continuously energized for a long time, or when the engine speed becomes too high.
第３図は、本発明のさらに他の実施例を示すものである
。FIG. 3 shows yet another embodiment of the invention.
この実施例では、開閉弁１２を負圧応動型にしたもので
、絞り弁７下流側の負圧を連通路２０を介して開閉弁１
２に導き、この負圧により弁駆動するようにしたもので
ある。上記開閉弁１２ば、アイドリングや低負荷運転の
ときのように絞り弁７の開度が小さいときには、絞り弁
７下流側の高負圧により、第３図に示すように閉弁状態
にある。加速操作により絞り弁７０開度を太き（すると
、絞り弁７下流側の負圧が低下するため、上記開閉弁１
２は開弁する。この開弁により、上記実施例同様に、空
気室１０に貯留された負圧がダイヤフラム室４に作用し
、ピストン弁２を敏速に上昇させる。In this embodiment, the on-off valve 12 is of a negative pressure responsive type, and the negative pressure on the downstream side of the throttle valve 7 is supplied to the on-off valve 1 through the communication passage 20.
2, and the valve is driven by this negative pressure. When the opening degree of the throttle valve 7 is small, such as during idling or low-load operation, the on-off valve 12 is in a closed state as shown in FIG. 3 due to the high negative pressure downstream of the throttle valve 7. The opening degree of the throttle valve 70 is increased by the acceleration operation (as a result, the negative pressure on the downstream side of the throttle valve 7 decreases, so the on-off valve 1
2 opens the valve. By opening the valve, the negative pressure stored in the air chamber 10 acts on the diaphragm chamber 4, causing the piston valve 2 to rise quickly, as in the embodiment described above.
したがって、上記第２および第３の実施例の場合も、第
１の実施例と同様に、加速初期にエンジンに十分な空気
を供給することができ、敏速な加速を行うことができる
。Therefore, in the second and third embodiments, as in the first embodiment, sufficient air can be supplied to the engine at the beginning of acceleration, and rapid acceleration can be achieved.
上述したように本発明は、ベンチュリ部にこのベンチュ
リ部を横切るピストン弁を設け、このピストン弁の上部
に前記ベンチュリ部と連通するダイヤフラム室を設け、
このダイヤフラム室の負圧変化により前記ピストン弁の
位置を制御すべくすると共に、前記ベンチュリ部に連通
ずる空気通路に絞り弁を設けた可変ベンチュリ式気化器
において、前記絞り弁の下流側に、その下流側の負圧を
抽出貯留する空気室を接続し、この空気室を前記絞り弁
が大きな絞り状態のとき閉弁状態である開閉弁を介して
前記ダイヤフラム室に連通させ、前記開閉弁を前記絞り
弁の一定以上の開度又は開速度に応動して開弁すべくし
たので、加速初期において空気室に貯留された負圧が、
開閉弁を介してダイヤフラム室に作用するためピストン
弁を敏速に上昇させることができる。そのため、加速に
必要な十分な空気をエンジンに供給することができ、敏
速な加速を行うことができる。As described above, the present invention provides a venturi section with a piston valve that crosses the venturi section, and a diaphragm chamber that communicates with the venturi section above the piston valve.
In a variable venturi carburetor, the position of the piston valve is controlled by changes in the negative pressure in the diaphragm chamber, and a throttle valve is provided in the air passage communicating with the venturi part, and a throttle valve is provided downstream of the throttle valve. An air chamber for extracting and storing negative pressure on the downstream side is connected, and this air chamber is communicated with the diaphragm chamber via an on-off valve that is closed when the throttle valve is in a large throttle state, and the on-off valve is connected to the diaphragm chamber. Since the valve was designed to open in response to the opening degree or opening speed of the throttle valve above a certain level, the negative pressure stored in the air chamber at the beginning of acceleration
Since it acts on the diaphragm chamber through the on-off valve, the piston valve can be raised quickly. Therefore, sufficient air necessary for acceleration can be supplied to the engine, and rapid acceleration can be performed.
第１図は本発明の実施例による可変ベンチュリ式気化器
を一部断面にして示す概略側面図、第２図は他の実施例
による気化器を一部断面にして示す概略側面図、第３図
は第２図の気化器の切換弁を作動するためのフローチャ
ート図、第４図は本発明のさらに他の実施例を一部断面
にして示す概略側面図である。
■・・・空気通路、 ２・・・ピストン弁、 ３・・・
ベンチュリ部、 ４・・・ダイヤフラム室、 ７・・・
絞り弁、 ９・・・逆止弁、 １０・・・空気室、 １
２・・・開閉弁、 １３・・・（絞り弁の一定以上の開
度又は開速度を検知する）センサ、 ２０・・・連通路
。
代理人 弁理士 小 川 信 −
弁理士 野 口 賢 照
弁理士斎下和彦FIG. 1 is a schematic side view partially in section of a variable venturi type carburetor according to an embodiment of the present invention, FIG. 2 is a schematic side view partially in section showing a vaporizer according to another embodiment, and FIG. This figure is a flowchart for operating the switching valve of the carburetor shown in FIG. 2, and FIG. 4 is a schematic side view, partially in section, of still another embodiment of the present invention. ■...Air passage, 2...Piston valve, 3...
Venturi section, 4...Diaphragm chamber, 7...
Throttle valve, 9... Check valve, 10... Air chamber, 1
2... Opening/closing valve, 13... Sensor (detects the opening degree or opening speed of the throttle valve above a certain level), 20... Communication path. Agent: Patent Attorney Shin Ogawa − Patent Attorney Ken Noguchi Teru Patent Attorney Kazuhiko Saishita
Claims (1)
設け、このピストン弁の上部に前記ベンチュリ部と連通
するダイヤフラム室を設け、このダイヤフラム室の負圧
変化により前記ピストン弁の位置を制御すべくすると共
に、前記ベンチュリ部に連通ずる空気通路に絞り弁を設
けた可変ベンチュリ式気化器において、前記絞り弁の下
流側に、その下流側の負圧を抽出貯留する空気室を接続
し、この空気室を前記絞り弁が大きな絞り状態のとき閉
弁状態である開閉弁を介して前記ダイヤフラム室に連通
させ、前記開閉弁を前記絞り弁の一定以上の開度又は開
速度に応動して開弁すべくしたことを特徴とする可変ベ
ンチュリ式気化器。A venturi section is provided with a piston valve that crosses the venturi section, a diaphragm chamber is provided above the piston valve that communicates with the venturi section, and the position of the piston valve is controlled by changes in negative pressure in the diaphragm chamber, and In a variable venturi type carburetor in which a throttle valve is provided in the air passage communicating with the venturi section, an air chamber for extracting and storing negative pressure on the downstream side is connected to the downstream side of the throttle valve, and this air chamber is connected to the downstream side of the throttle valve. The throttle valve communicates with the diaphragm chamber through an on-off valve that is in a closed state when the throttle valve is in a large throttle state, and the on-off valve is opened in response to an opening degree or opening speed of the throttle valve above a certain level. A variable venturi type carburetor characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59048119A JPH0615849B2 (en) | 1984-03-15 | 1984-03-15 | Variable bench lily type vaporizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59048119A JPH0615849B2 (en) | 1984-03-15 | 1984-03-15 | Variable bench lily type vaporizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60192866A true JPS60192866A (en) | 1985-10-01 |
| JPH0615849B2 JPH0615849B2 (en) | 1994-03-02 |
Family
ID=12794434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59048119A Expired - Fee Related JPH0615849B2 (en) | 1984-03-15 | 1984-03-15 | Variable bench lily type vaporizer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0615849B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998006937A1 (en) * | 1996-08-12 | 1998-02-19 | Dynojet Research, Inc. | Constant velocity carburetor with variable venturi slide having bleed holes at an oblique angle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5660844A (en) * | 1979-10-18 | 1981-05-26 | Aisan Ind Co Ltd | Variable choke carburetor |
| JPS58222958A (en) * | 1982-06-21 | 1983-12-24 | Mikuni Kogyo Co Ltd | Variable choke (venturi) type carburetor |
-
1984
- 1984-03-15 JP JP59048119A patent/JPH0615849B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5660844A (en) * | 1979-10-18 | 1981-05-26 | Aisan Ind Co Ltd | Variable choke carburetor |
| JPS58222958A (en) * | 1982-06-21 | 1983-12-24 | Mikuni Kogyo Co Ltd | Variable choke (venturi) type carburetor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998006937A1 (en) * | 1996-08-12 | 1998-02-19 | Dynojet Research, Inc. | Constant velocity carburetor with variable venturi slide having bleed holes at an oblique angle |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0615849B2 (en) | 1994-03-02 |
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