JPS60192868A - Fuel feeding apparatus - Google Patents

Fuel feeding apparatus

Info

Publication number
JPS60192868A
JPS60192868A JP4811884A JP4811884A JPS60192868A JP S60192868 A JPS60192868 A JP S60192868A JP 4811884 A JP4811884 A JP 4811884A JP 4811884 A JP4811884 A JP 4811884A JP S60192868 A JPS60192868 A JP S60192868A
Authority
JP
Japan
Prior art keywords
air
valve
throttle valve
bypass passage
air 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.)
Pending
Application number
JP4811884A
Other languages
Japanese (ja)
Inventor
Fumiki Sano
佐野　文基
Nobuyuki Terashita
寺下　伸志
Osamu Yamana
山名　修
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yamaha Motor Co Ltd
Original Assignee
Yamaha Motor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Yamaha Motor Co Ltd filed Critical Yamaha Motor Co Ltd
Priority to JP4811884A priority Critical patent/JPS60192868A/en
Publication of JPS60192868A publication Critical patent/JPS60192868A/en
Pending legal-status Critical Current

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
    • F02M3/00—Idling devices for carburettors
    • F02M3/06—Increasing idling speed
    • F02M3/062—Increasing idling speed by altering as a function of motor r.p.m. the throttle valve stop or the fuel conduit cross-section by means of pneumatic or hydraulic means
    • 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)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)

Abstract

PURPOSE:To prevent the excessively condensed state of fuel in the mixed gas in the case when a throttle valve is sharply closed and excessive engine brake by installing an air chamber for temporarily storing air and an always-closed opening and closing valve connected to the air chamber, into a bypass passage ranging between the upstream side and the downstream side of the throttle valve. CONSTITUTION:When a throttle valve 7 in the state over a certain opening degree is sharply closed, the negative pressure on the downstream side sharply rises to open an always-closed opening and closing valve 11 installed into a bypass passage 8. From this time, the air on the upstream side of the valve 7 flows into the passage 8 and flows-out to the downstream of the valve 7 together with the air temporarily stored in an air chamber 10. Therefore, excessive engine brake is prevented, and the excessive concentrated state of fuel is prevented. Since almost all of the air in the air chamber 10 flows out and the negative pressure on the downstream side of the valve 7 is reduced, the opening and closing valve 11 is automatically closed, and the flow rate of the air which flows into the bypass passage 8 from the upstream of the valve 7 is regulated, and the air is stored again into the air chamber 10, for the sharp increase of the negative pressure in the next time.

Description

【発明の詳細な説明】 〔発明の技術分野〕 本発明は、燃料と空気との混合気を形成する燃料供給装
置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a fuel supply device that forms a mixture of fuel and air.

〔従来技術〕[Prior art]

内燃機関において混合気を成形するための燃料供給装置
には、気化器や電子燃料噴射装置がある。いずれも内燃
機関の燃焼室に連通ずるようにした空気流路に、燃料噴
射ノズルを臨ませると共に、空気流量を調節するための
絞り弁を設ける構成になっている。　゛ ところが、上記絞り弁を一定以上の開弁状態から急閉す
ると、絞り弁下流側の負圧（マニホルド負圧）が急上昇
し、そのため空気に対する燃料の濃度が濃くなりすぎて
、アフタバーンや失火の原因になっている。また、上述
のように絞り弁を急閉した場合には、吸入空気量が急激
に減少するため、過度のエンジンブレーキがかかり、特
に自動二輪車等の場合には後輪（駆動輪）がスリップす
る現象が見られる。Fuel supply devices for forming an air-fuel mixture in an internal combustion engine include a carburetor and an electronic fuel injection device. In either case, a fuel injection nozzle faces an air flow path communicating with the combustion chamber of an internal combustion engine, and a throttle valve is provided to adjust the air flow rate.゛However, when the throttle valve is suddenly closed after being opened above a certain level, the negative pressure on the downstream side of the throttle valve (manifold negative pressure) rises rapidly, which causes the concentration of fuel in the air to become too high, resulting in afterburn and misfire. It is the cause. Additionally, when the throttle valve is suddenly closed as described above, the amount of intake air decreases rapidly, resulting in excessive engine braking, which can cause the rear wheels (drive wheels) to slip, especially in the case of motorcycles. A phenomenon can be seen.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、絞り弁を急閉した場合に、燃料の過濃
状態や過度のエンジンブレーキが発生しないようにした
燃料供給装置を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a fuel supply system that prevents excessive fuel enrichment and excessive engine braking when a throttle valve is suddenly closed.

〔発明の構成〕[Structure of the invention]

上記目的を達成するための本発明は、燃料噴射ノズルを
臨ませた空気流路に、空気流量を調節する絞り弁を設け
た燃料供給装置において、前記空気流路に前記絞り弁の
上流と下流とにわたるバイパス通路を設け、このバイパ
ス通路に、空気をて時的に貯留する空気室と、この空気
室に接続した常閉の開閉弁とを設け、この開閉弁を前記
絞り弁下流側の負圧上昇により開弁すべくしたことを特
徴とするものである。To achieve the above object, the present invention provides a fuel supply device in which a throttle valve for adjusting the air flow rate is provided in an air flow path facing a fuel injection nozzle, in which the air flow path is provided with a throttle valve upstream and downstream of the throttle valve. A bypass passage is provided, and this bypass passage is provided with an air chamber for temporarily storing air, and a normally closed on-off valve connected to this air chamber, and this on-off valve is connected to the negative side downstream of the throttle valve. The valve is designed to open due to pressure rise.

〔発明の実施例〕[Embodiments of the invention]

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図は可変ベンチュリ式気化器であって、空気通路１
の上流側から、矢印へ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。FIG. 1 shows a variable venturi type carburetor, in which air passage 1
Air is supplied from an air purifier (not shown) from the upstream side as shown by the arrow B, and the air-fuel mixture formed in the carburetor is supplied from the downstream side to the engine (not shown) as shown by the arrow B. It looks like this.

上記空気流路１にはピストン状のベンチュリ弁２が上下
に摺動自在に設けられ、そのベンチュリ弁２の下端にベ
ンチュリ部３が形成されている。ベンチュリ弁２の上部
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
圧変化に応動してベンチュリ弁２を上下動させるように
している。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にはベンチュリ弁２に固定した
針弁６が挿入されている。針弁６はベンチュリ弁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。A piston-shaped venturi valve 2 is provided in the air flow path 1 so as to be slidable up and down, and a venturi portion 3 is formed at the lower end of the venturi valve 2. A diaphragm chamber 4 communicating with the venturi section 3 through a communication hole 2a is provided at the upper part of the venturi valve 2, and the venturi valve 2 is moved up and down in response to changes in negative pressure in the diaphragm chamber 4. . A fuel injection nozzle 5 faces the venturi portion 3, and a needle valve 6 fixed to the venturi valve 2 is inserted into the fuel injection nozzle 5. The needle valve 6 moves up and down together with the venturi 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。空気流路工には、上記絞り弁７の
上流と下流とにわたってバイパスするバイパス通路８が
設けてあり、そのバイパス通路８には、上流側がら空気
通過量を規制するチョーク９、空気を一時的に貯留する
空気室１０、常時は閉弁状態になっている開閉弁１１が
直列に設けられている。開閉弁１１は、この開閉弁１１
より下流側のバイパス通路８から分岐した分岐管１２を
介して、絞り弁７の下流側の負圧作用により駆動される
ようにしてあり、その負圧が一定以上の高負圧になった
とき開弁に切換ねり、バイパス通路８を連通状態にする
。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. The air channel construction is provided with a bypass passage 8 that bypasses the upstream and downstream sides of the throttle valve 7, and the bypass passage 8 includes a choke 9 that regulates the amount of air passing from the upstream side, and a choke 9 that restricts the amount of air passing from the upstream side. An air chamber 10 for storing air and an on-off valve 11 which is normally closed are provided in series. The on-off valve 11 is this on-off valve 11
It is configured to be driven by the negative pressure action on the downstream side of the throttle valve 7 via a branch pipe 12 branched from the bypass passage 8 on the downstream side, and when the negative pressure reaches a high negative pressure above a certain level. The valve is switched to open, and the bypass passage 8 is brought into communication.

上述の気化器において、一定以上の開度状態にある絞り
弁７を急閉すると、その絞り弁７の下流側の負圧は急上
昇し、その高負圧により、バイパス通路８における常閉
の開閉弁１１は開弁する。このときのバイパス通路８の
出口側の０点での空気流量の変化をグラフ化すると、第
２図のようになる。すなわち、開閉弁１１が開弁したｔ
、の時点から、絞り弁７の上流側の空気がバイパス通路
８に流入し、空気室１０に一時的に貯留されていた空気
とと共に、急激に絞り弁７の下流側へ流出する。このと
きエンジンの回転数は高く、主に上記空気室１０から吸
い出された空気が消費される。そのため、過度のエンジ
ンブレーキが防止され、また燃料の過濃状態が防止され
る。In the above-mentioned carburetor, when the throttle valve 7 which is in an opening state above a certain level is suddenly closed, the negative pressure on the downstream side of the throttle valve 7 rises rapidly, and due to this high negative pressure, the normally closed state in the bypass passage 8 is closed. Valve 11 is opened. If the change in air flow rate at the zero point on the outlet side of the bypass passage 8 at this time is graphed, it will be as shown in FIG. 2. That is, t when the on-off valve 11 opens
From the point in time, the air on the upstream side of the throttle valve 7 flows into the bypass passage 8 and suddenly flows out to the downstream side of the throttle valve 7 together with the air temporarily stored in the air chamber 10. At this time, the engine speed is high, and the air sucked out from the air chamber 10 is mainly consumed. Therefore, excessive engine braking is prevented, and a state of excessive fuel concentration is also prevented.

ｔ２の時点は、エンジンの回転数が徐々に下がった点で
あり、空気室１０の空気ははソ′流出して、絞り弁７の
下流側の負圧は緩和される。At time t2, the engine speed gradually decreases, the air in the air chamber 10 flows out, and the negative pressure on the downstream side of the throttle valve 7 is relaxed.

そのため、開閉弁１１が自動的に元の閉弁位置に復帰す
る。この開閉弁１１が閉弁することにより、絞り弁７の
上流側からバイパス通路８に引続き流入する空気は、第
２図中に示すようにチョーク９により流量をｑに規制さ
れながら再び空気室１０に貯留され、次の急激な負圧上
昇に備えることになる。このチョーク９は、空気室１０
の容量と共に、エンジンブレーキの利き具合を決定する
要因になる。Therefore, the on-off valve 11 automatically returns to its original closed position. When the on-off valve 11 is closed, the air that continues to flow into the bypass passage 8 from the upstream side of the throttle valve 7 returns to the air chamber 10 while the flow rate is regulated to q by the choke 9, as shown in FIG. This will be stored in the tank in preparation for the next sudden rise in negative pressure. This choke 9 has an air chamber 10
Along with the capacity of the engine, it is a factor that determines the effectiveness of engine braking.

第３図は、本発明の他の実施例を示すもので、開閉弁１
１の駆動を電磁駆動部１３により行う点を除けば、他は
上記第１の実施例と同様の構成になっている。FIG. 3 shows another embodiment of the present invention, in which the on-off valve 1
The structure of the second embodiment is the same as that of the first embodiment, except that the electromagnetic drive unit 13 drives the first embodiment.

上記電磁駆動部１３は、ＡＮＤ回路１４を介してセンサ
１５．１６に接続されている。センサ１５は、絞り弁７
が一定の開度以下に絞られたことを検知するものであり
、またセンサ１６は、エンジンが一定の回転数以上の高
速回転であることを検知するものである。このセンサ１
５．１６の検知信号により上記電磁駆動部１３が作動し
、常閉の開閉弁１１を開弁状態に切換える。したがって
、この実施例の場合も、上記第１の実施例と同様に、燃
料の過濃状態や過度のエンジンブレーキを防止すること
ができる。The electromagnetic drive unit 13 is connected to sensors 15 and 16 via an AND circuit 14. The sensor 15 is connected to the throttle valve 7
The sensor 16 detects that the opening of the engine is narrowed to a certain degree or less, and the sensor 16 detects that the engine is rotating at a high speed above a certain number of revolutions. This sensor 1
The electromagnetic drive unit 13 is actuated by the detection signal 5.16, and the normally closed on-off valve 11 is switched to the open state. Therefore, in this embodiment, as in the first embodiment, it is possible to prevent excessive fuel enrichment and excessive engine braking.

なお、上記各実施例は、いずれも可変ベンチュリ式気化
器の場合について説明したが、本発明は固定ベンチュリ
式気化器についても通用可能であり、また燃料噴射ノズ
ルを電子燃料噴射装置の噴射ノズルとする場合にも適用
可能である。Although each of the above embodiments has been described with respect to a variable venturi type carburetor, the present invention can also be applied to a fixed venturi type carburetor, and the fuel injection nozzle may be used as an injection nozzle of an electronic fuel injection device. It is also applicable when

〔発明の効果〕〔Effect of the invention〕

上述したように本発明は、燃料噴射ノズルを臨ませた空
気流路に、空気流量を調節する絞り弁を設けた燃料供給
装置において、前記空気流路に前記絞り弁の上流と下流
とにわたるバイパス通路を設け、このバイパス通路に、
空気を一時的に貯留する空気室と、この空気室に接続し
た常閉の開閉弁とを設け、この開閉弁を前記絞り弁下流
側の負圧上昇により開弁すべく構成したので、絞り弁が
急閉した場合に起る下流側の負圧上昇は、バイパス通路
を介して絞り弁上流側および空気室から流入する空気に
より緩和される。そのため、混合気における燃料の過濃
状態や過度のエンジンブレーキを防止することができる
。As described above, the present invention provides a fuel supply device in which a throttle valve for adjusting the air flow rate is provided in an air flow path facing a fuel injection nozzle, in which a bypass is provided in the air flow path extending upstream and downstream of the throttle valve. A passage is provided, and in this bypass passage,
An air chamber for temporarily storing air and a normally closed on-off valve connected to this air chamber are provided, and this on-off valve is opened by an increase in negative pressure downstream of the throttle valve. The rise in negative pressure on the downstream side that occurs when the valve is suddenly closed is alleviated by air flowing from the upstream side of the throttle valve and the air chamber via the bypass passage. Therefore, it is possible to prevent excessive fuel enrichment in the air-fuel mixture and excessive engine braking.

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

第１図は本発明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２図は同気化器のバイパス通路出口
側の空気流量と時間との関係を示す関係図、第３図は本
発明の他の実施例による気化器の要部を断面にして示す
概略側面図である。 １・・・空気流路、　２・・・ベンチュリ弁、　３・・
・ベンチュリ部、　５・・・燃料噴射ノズル、　７・・
・絞り弁、　８・・・バイパス通路、　１１・・・開閉
弁。 −一部＼ ｉ）Ｉ腋愼喘FIG. 1 is a schematic side view showing a partially sectional view of a carburetor according to an embodiment of the present invention, FIG. 2 is a relational diagram showing the relationship between air flow rate and time on the bypass passage outlet side of the vaporizer, and FIG. The figure is a schematic side view showing a main part of a vaporizer according to another embodiment of the present invention in cross section. 1... Air flow path, 2... Venturi valve, 3...
・Venturi part, 5...Fuel injection nozzle, 7...
- Throttle valve, 8... Bypass passage, 11... Open/close valve. - Some ＼ i) I armpit cramps

Claims (1)

【特許請求の範囲】[Claims] 燃料噴射ノズルを臨ませた空気流路に、空気流量を調節
する絞り弁を設けた燃料供給装置において、前記空気流
路に前記絞り弁の上流と下流とにわたるバイパス通路を
設け、このバイパス通路に、空気を一時的に貯留する空
気室と、この空気室に接続した密閉の開閉弁とを設け、
この開閉弁を前記絞り弁下流側の負圧上昇により開弁す
べくしたことを特徴とする燃料供給装置。In a fuel supply device in which a throttle valve for adjusting the air flow rate is provided in an air flow path facing a fuel injection nozzle, a bypass passage extending upstream and downstream of the throttle valve is provided in the air flow path, and the bypass passage is provided with a bypass passage extending upstream and downstream of the throttle valve. , an air chamber for temporarily storing air, and a sealed on-off valve connected to this air chamber,
A fuel supply device characterized in that the opening/closing valve is opened by an increase in negative pressure downstream of the throttle valve.
JP4811884A 1984-03-15 1984-03-15 Fuel feeding apparatus Pending JPS60192868A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4811884A JPS60192868A (en) 1984-03-15 1984-03-15 Fuel feeding apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4811884A JPS60192868A (en) 1984-03-15 1984-03-15 Fuel feeding apparatus

Publications (1)

Publication Number Publication Date
JPS60192868A true JPS60192868A (en) 1985-10-01

Family

ID=12794405

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4811884A Pending JPS60192868A (en) 1984-03-15 1984-03-15 Fuel feeding apparatus

Country Status (1)

Country Link
JP (1) JPS60192868A (en)

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