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譯文題目： 內燃機的供油系統(tǒng)
學生姓名： 學 號：
專 業(yè)：
所在學院：
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20xx年 2月 27日
Fuel?Supply?System?For?An?Internal?Combustion?Engine
Abstract
A?pulsation?damper?is?provided?between?and?in?series?with?a?low?pressure?fuel?system?pipe?and?a?high?pressure?pump?of?a?fuel?supply?system.?During?startup?of?an?engine,low?pressure?fuel?supplied?via?the?low?pressure?fuel?system?pipe?is?injected?from?an?intake?passage?fuel?injector.?When?the?fuel?pressure?is?equal?to?or?less?than?a?fuel?pressure?at?which?good?startability?can?be?maintained,the?pulsation?damper?closes?off?communication?between?the?high?pressure?fuel?system?pipe?and?the?low?pressure?fuel?system?pipe?using?the?spring?force?of?a?spring.?
Key?words:?Fuel?supply?system;?An?internal?combustion?engine?A?pulsation?damper;?A?low?pressure?fuel?system?pipe?and?a?high?pressure?pump;?
A?fuel?supply?system?for?an?internal?combustion?engine,comprising:?a?low?pressure?pump?that?is?capable?to?pressurize?fuel;?a?low?pressure?fuel?supply?passage?that?is?capable?to?supply?fuel?that?was?pressurized?by?the?low?pressure?pump?to?a?low?pressure?fuel?injection?mechanism?which?injects?fuel?into?an?intake?passage;?a?branch?passage?that?branches?off?from?the?low?pressure?fuel?supply?passage?and?through?which?the?fuel?that?was?pressurized?by?the?low?pressure?pump?flows;?a?high?pressure?pump?which?is?capable?to?pressurize?the?fuel?supplied?via?the?branch?passage,the?high?pressure?pump?being?driven?by?the?internal?combustion?engine;?a?high?pressure?fuel?supply?passage?that?is?capable?to?supply?fuel?that?was?pressurized?by?the?high?pressure?to?a?high?pressure?fuel?injection?mechanism?which?injects?fuel?into?a?cylinder;?and?a?pulsation?reducing?mechanism?provided?on?an?intake?side?of?the?high?pressure?pump,wherein,when?the?internal?combustion?engine?is?started?by?only?injecting?fuel?from?the?low?pressure?supply?passage?into?the?intake?passage,the?pulsation?reducing?mechanism?closes?off?communication?between?the?low?pressure?fuel?supply?passage?and?the?high?pressure?fuel?supply?passage?until?a?pressure?of?fuel?in?the?low?pressure?fuel?supply?passage?reaches?a?predetermined?pressure?value?required?for?starting?the?internal?combustion?engine.?
Background?of?the?invention?:?
1.?Field?of?the?Invention??
The?invention?relates?to?a?fuel?supply?system?for?an?internal?combustion?engine?provided?with?a?fuel?injection?mechanism?that?injects?fuel?at?high?pressure?into?a?cylinder?(i.e.;?a?fuel?injector?for?in-cylinder?injection,hereinafter?referred?to?as?“in-cylinder?fuel?injector”)?and?a?fuel?injection?mechanism?that?injects?fuel?into?anintake?passage?or?an?intake?port?(i.e.,a?fuel?injector?for?intake?passage?injection,hereinafter?referred?to?as?“intake?passage?fuel?injector”).?More?particularly,the?invention?relates?to?a?fuel?supply?system?that?can?improve?startability?of?an?internal?combustion?engine.??2.?Description?of?the?Related?Art??
A?gasoline?engine?is?known?which?is?provided?with?a?fast?fuel?injection?valve?for?injecting?fuel?into?a?combustion?chamber?of?the?engine?(i.e.,an?in-cylinder?fuel?injector)?and?a?second?fuel?injection?valve?for?injecting?fuel?into?an?intake?passage?(i.e.,an?intake?passage?fuel?injector),and?divides?the?injected?fuel?between?the?in-cylinder?fuel?injector?and?the?intake?passage?fuel?injector?according?to?the?engine?speed?and?engine?load.?Also,a?direct?injection?gasoline?engine?is?also?known?which?is?provided?with?only?a?fuel?injection?valve?for?injecting?fuel?into?the?combustion?chamber?of?the?engine?(i.e.,an?in-cylinder?fuel?injector).?In?a?high?pressure?fuel?system?that?includes?an?in-cylinder?fuel?injector,fuel?of?which?the?pressure?has?been?increased?by?a?high?pressure?fuel?pump?is?supplied?to?the?in-cylinder?fuel?injector?via?a?delivery?pipe.?The?in-cylinder?fuel?injector?then?injects?the?high?pressure?fuel?into?the?combustion?chamber?of?each?cylinder?of?the?internal?combustion?engine.??
In?addition,a?diesel?engine?is?also?known?which?has?a?common?rail?type?fuel?injection?system.?In?this?common?rail?type?fuel?injection?system,fuel?which?has?been?increased?in?pressure?by?a?high?pressure?fuel?pump?is?stored?in?a?common?rail.?The?high?pressure?fuel?is?then?injected?into?the?combustion?chamber?of?each?cylinder?of?the?diesel?engine?from?the?common?rail?by?opening?and?closing?an?electromagnetic?valve.??
In?order?to?increase?the?pressure?of?(i.e.,pressurize)?the?fuel?in?this?kind?of?internal?combustion?engine,a?high?pressure?fuel?pump?is?provided?which?is?driven?by?a?cam?provided?on?a?driveshaft?that?is?connected?to?a?crankshaft?of?the?internal?combustion?engine.??
Japanese?Patent?Application?Publication?No.?JP-A-2005-139923?describes?a?high?pressure?fuel?supply?system?for?an?internal?combustion?engine?that?can?reduce?vibrational?noise?when?only?a?small?amount?of?fuel?is?required?by?the?internal?combustion?engine,such?as?during?idling,while?being?able?to?deliver?the?necessary?amount?of?fuel?over?the?entire?operating?range?of?the?internal?combustion?engine.?This?high?pressure?fuel?supply?system?for?an?internal?combustion?engine?has?a?two?single?plunger?type?high?pressure?fuel?pumps?each?of?which?have?a?spill?valve?that?spills?fuel?drawn?into?a?pressurizing?chamber?that?is?divided?by?a?cylinder?and?a?plunger?that moves?back?and?forth?in?the?cylinder,from?that?pressurizing?chamber.?When?fuel?is?pressurized?and?delivered?from?the?pressurizing?chamber?to?the?high?pressure?fuel?system,the?amount?of?fuel?delivered?is?adjusted?by?controlling?the?spill?valve?open?and?closed.?One?of?these?high?pressure?fuel?pumps?is?a?first?high?pressure?fuel?pump?in?which?the?lift?amount?of?the?plunger?is?small?and?the?other?high?pressure?fuel?pump?is?a?second?high?pressure?fuel?pump?in?which?the?lift?amount?of?the?plunger?is?large.?In?addition?to?these?two?high?pressure?fuel?pumps,the?high?pressure?fuel?supply?system?for?an?internal?combustion?engine?also?includes?control?means.?The?control?means?controls?the?spill?valve?of?each?high?pressure?fuel?pump?according?to?the?amount?of?fuel?required?by?the?internal?combustion?engine,such?that?fuel?is?pressurized?and?delivered?using?only?the?first?high?pressure?fuel?pump?when?the?amount?of?required?fuel?is?small,and?fuel?is?pressurized?and?delivered?using?at?least?the?second?high?pressure?fuel?pump?when?the?amount?of?required?fuel?is?large.??
According?to?this?high?pressure?fuel?supply?system?for?an?internal?combustion?engine,of?the?two?high?pressure?fuel?pumps,the?first?high?pressure?fuel?pump?has?a?plunger?with?a?small?lift?amount?so?the?rate?of?pressure?increase?is?small?and?a?large?amount?of?water?hammer?is?also?self-suppressed.?That?is,with?the?high?pressure?fuel?supply?system,the?vibrational?noise?produced?when?the?required?fuel?quantity?is?small?can?be?preferably?reduced?by?controlling?the?spill?valve?of?each?of?the?high?pressure?fuel?pumps?so?that?only?the?first?high?pressure?fuel?pump?is?used?when?the?amount?of?fuel?required?for?the?internal?combustion?engine?is?small?such?as?during?idling.?On?the?other?hand,the?second?high?pressure?fuel?pump?has?a?plunger?with?a?large?lift?amount?so?pressurizing?and?delivering?fuel?using?at?least?this?second?high?pressure?fuel?pump?also?makes?it?possible?to?deliver?the?required?fuel?quantity?when?the?amount?of?fuel?required?by?the?internal?combustion?engine?increases?to?the?point?where?it?can?no?longer?be?delivered?by?the?first?high?pressure?fuel?pump?alone.?That?is,providing?two?high?pressure?fuel?pumps?having?plungers?with?different?lift?amounts?in?this?way?enables?the?required?amount?of?fuel?to?be?delivered?throughout?the?entire?operating?range?of?the?internal?combustion?engine,while?reducing?vibrational?noise?when?the?amount?of?required?fuel?is?small.??
In?Japanese?Patent?Application?Publication?No.?JP-A-2005-139923,the?high?pressure?fuel?supply?system?for?a?V-type?8?cylinder?internal?combustion?engine?having?an?in-cylinder?fuel?injector?in?each?cylinder?is?provided?with?a?high?pressure?fuel?pump?for?each?bank.?Tip?ends?that?branch?off?from?a?low?pressure?fuel?passage?whichis?connected?to?the?fuel?tank?are?connected?to?galleries?of?these?high?pressure?fuel?pumps.?For?each?bank,a?pulsation?damper?is?provided?midway?between?the?branch?portion?of?the?low?pressure?fuel?passage?and?the?portion?that?connects?with?the?gallery.?This?pulsation?damper?suppresses?the?pulsation?in?the?fuel?pressure?in?the?low?pressure?fuel?passage?when?the?high?pressure?fuel?pump?is?operating.?At?engine?startup?in?this?kind?of?a?direct?injection?engine?having?only?an?in-cylinder?fuel?injector,fuel?is?unable?to?be?delivered?by?the?high?pressure?fuel?pump?until?the?engine?turns?over.?Therefore,low?pressure?fuel?is?delivered?by?a?feed?pump?to?the?fuel?injection?for?in-cylinder?injection.?Therefore,the?pulsation?damper?is?designed?to?provide?communication?between?the?high?pressure?pipe?system?and?the?low?pressure?pipe?system.?For?example,FIG.?6?is?a?sectional?view?of?such?a?pulsation?damper?215?,FIG.?7?is?a?sectional?view?taken?along?line?VII-VII?of?FIG.?6?,and?FIG.?8?is?a?sectional?view?taken?along?line?VIII-VIII?of?FIG.?7.?As?shown?in?FIGS.?6?to?8,grooves?223?A,223?B,223?C,and?223?D?are?provided?in?an?end?face?(i.e.,the?upper?surface?in?FIG.?8)?that?abuts?against?a?contacting?member?226?A?of?the?pulsation?damper?215?.?Therefore,when?the?feed?pressure?is?low,the?spring?226?D?presses?the?contacting?member?226?A?against?the?upper?surface?of?the?member?that?forms?the?inlet?222?and?the?outlet?224?.?In?this?way,the?structure?is?such?that?even?if?pressure?is?applied?by?the?spring?226?D,the?grooves?223?A,223?B,223?C,and?223?D?enable?fuel?delivered?from?the?inlet?222?(i.e.,the?feed?pump?side)?to?flow?into?the?outlet?224?(i.e.,the?high?pressure?fuel?pump?side)?as?shown?by?the?dotted?line?in?FIG.?8.?On?the?other?hand,as?described?above,an?engine?is?known?which?includes,for?each?cylinder,an?in-cylinder?fuel?injector?that?injects?fuel?into?a?combustion?chamber?of?the?engine?and?an?intake?passage?fuel?injector?that?injects?fuel?into?an?intake?passage.?In?this?engine,fuel?is?injected?divided?between?the?in-cylinder?fuel?injector?and?the?intake?passage?fuel?injector?according?to?the?engine?speed?and?the?load?on?the?internal?combustion?engine.?This?engine?is?also?provided?with?the?pulsation?damper?shown?in?FIGS.?6?to?8.?
However,in?this?kind?of?engine,the?following?problems?occur?when?starting?the?engine?by?injecting?fuel?with?an?intake?passage?fuel?injector.?When?fuel?is?delivered?by?a?feed?pump?at?engine?startup,the?volume?of?pipe?that?needs?to?be?charged?with?fuel?becomes?significantly?larger.?That?is,when?the?engine?is?started?with?fuel?injected?from?the?intake?passage?fuel?injector,despite?the?fact?that?fuel?can?be?delivered?to?the?intake?passage?fuel?injector?with?the?feed?pump?by?simply?charging?only?the?low?pressure?pipe?with?fuel,the?pulsation?damper?is?structured?such?that?the?high?pressure?pipe?system?and?the?low?pressure?pipe?system?are?communicated?or?open?to?one?another.?Therefore,fuel?is?unable?to?be?delivered?to?the?intake?passage?fuel?injector?by?the?feed?pump?unless?both?the?low?pressure?pipe?and?the?high?pressure?pipe?are?charged?with?fuel.?As?a?result,it?takes?time?for?the?feed?pressure?to?rise,thereby?adversely?affecting?startability?(i.e.,increasing?the?start?time).??
Summary?of?the?invention??
This?invention?thus?provides?a?fuel?supply?system?for?an?internal?combustion?engine,which?is?capable?of?improving?startability?of?an?internal?combustion?engine?that?includes?a?fuel?injection?mechanism?for?injecting?fuel?at?high?pressure?into?a?cylinder?(i.e.,in-cylinder?fuel?injector)?and?a?fuel?injecting?mechanism?for?injecting?fuel?into?an?intake?passage?or?an?intake?port?(i.e.,an?intake?passage?fuel?injector).??
A?first?aspect?of?the?invention?relates?to?a?fuel?supply?system?for?an?internal?combustion?engine?which?includes?a?low?pressure?fuel?supply?passage?that?supplies?fuel?that?was?pressurized?by?a?low?pressure?pump?to?a?low?pressure?fuel?injection?mechanism?which?injects?fuel?into?an?intake?passage;?a?branch?passage?that?branches?off?from?the?low?pressure?fuel?supply?passage?and?supplies?fuel?to?a?high?pressure?pump?that?is?driven?by?the?internal?combustion?engine;?a?high?pressure?fuel?supply?passage?that?supplies?fuel?that?was?pressurized?by?the?high?pressure?pump?to?a?high?pressure?fuel?injection?mechanism?which?injects?fuel?into?a?cylinder;?and?a?pulsation?reducing?mechanism?provided?on?the?intake?side?of?the?high?pressure?pump.?The?pulsation?reducing?mechanism?closes?off?communication?between?the?low?pressure?fuel?supply?passage?and?the?high?pressure?fuel?supply?passage?when?a?pressure?of?fuel?in?the?low?pressure?fuel?supply?passage?is?lower?than?a?predetermined?value.??
According?to?this?first?aspect,the?high?pressure?pump?which?is?driven?by?the?internal?combustion?engine?does?not?operate?during?startup?of?the?internal?combustion?engine.?In?this?case,the?internal?combustion?engine?is?started?by?injecting?fuel?that?has?been?pressurized?by?the?low?pressure?pump?from?the?low?pressure?fuel?injection?mechanism?via?the?low?pressure?fuel?supply?passage.?In?this?case,during?startup?of?the?internal?combustion?engine?when?the?pressure?of?fuel?in?the?low?pressure?fuel?supply?passage?is?low,the?pulsation?reducing?mechanism?closes?off?communication?between?the?low?pressure?fuel?supply?passage?and?the?high?pressure?fuel?supply?passage.?Therefore,fuel?can?be?delivered?to?the?low?pressure?fuel?injection?mechanism?simply?by?charging?the?low?pressure?fuel?supply?passage?with?fuel?using?the?low?pressure?pump.?Accordingly,there?is?no?need?to?charge?the?high?pressure?fuel?supply?passage?with?fuel?using?the?low?pressure?pump?so?the?low?pressure?fuel?supply?passage?and?the?branch?passage?that?provides?communication?between?the?low?pressure?fuel?supply?passage?and?the?high?pressure?pump?can?be?charged?with?fuel?quickly,and?fuel?can?bequickly?injected?from?the?low?pressure?fuel?injection?mechanism.?As?a?result,startability?of?an?internal?combustion?engine?provided?with?a?fuel?injection?mechanism?that?injects?fuel?at?high?pressure?into?the?cylinder?and?a?fuel?injection?mechanism?that?injects?fuel?into?the?intake?passage?or?intake?port?can?be?improved.
內燃機的燃油供應系統(tǒng)
摘 要
在低壓燃油供應系統(tǒng)管道和燃油供應系統(tǒng)的高壓泵之間有一系列的有節(jié)奏的脈動衰減節(jié)氣閥。在發(fā)動機啟動的階段，通過低壓燃油系統(tǒng)管道，低壓燃油從一燃油噴射機中被噴入。當燃油的壓力與維持發(fā)動機在穩(wěn)定狀態(tài)時所需的燃油壓力相同時或稍低時，此時有節(jié)奏的脈動衰減節(jié)氣閥，在彈簧的彈力作用下關閉了高壓燃油系統(tǒng)管道與低壓燃油系統(tǒng)管道之間的通路。?
關鍵詞：內燃機；燃油供應系統(tǒng)；脈動衰減節(jié)氣閥；低壓燃油供應系統(tǒng)管道和高壓泵。
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內燃機的燃油供系統(tǒng)，包括：一臺能給燃油加壓的低壓油泵、一個能供應低壓油泵所加壓的燃油通道，同時能把燃油輸送到低壓燃油抵押燃油噴射機構的入口處；一個分岔來自上面低壓燃油供應通道、并且流經(jīng)分支通道的燃油在流經(jīng)低壓燃油泵時被加壓；一臺能給通過上面的分支通道供應的低壓燃油進行加壓的高壓油泵，這臺高壓燃油泵通過內燃機而驅動；高壓燃油供應通道能夠將燃油噴入汽缸的高壓燃油噴射機構提供被加壓的燃油；同時一個有規(guī)律的衰減機構本安裝在高壓泵入口的一側，在哪兒，當內燃機啟動的時候，噴射入口處的燃油僅僅來自低壓燃油供應通道，此時這個有規(guī)律衰減機構經(jīng)低壓燃油供應通道與高壓燃油供應通道之間的通道關閉，直到低壓燃油供應通道中的燃油壓力達到了內燃機開始要求所預定的壓力值時才開啟。?
發(fā)明背景?
1.發(fā)明的領域?
這個發(fā)明是關于為內燃機燃油供應系統(tǒng)提供一個將燃油在較高壓力下將其噴入汽缸的燃油噴射機構（汽缸內燃油噴射，在下文涉及的是“缸內燃油噴射”）和一個將燃油噴入進口通道或端口噴射的燃油噴射機構（進口通道燃油噴射，在下文提到的“進口燃油噴射”）。尤其是這個發(fā)明所關于的燃油噴射供應系統(tǒng)能提高內燃機的工作穩(wěn)定性。?2.相關技術的介紹?
眾所周知，汽油機配備了一個將燃油快速噴入發(fā)動機燃燒室的燃油噴射閥和一個將燃油快速噴入進氣管道的二次燃油噴射閥（進氣管道燃油噴射器）。區(qū)分在汽缸內燃油噴射和進氣管道燃油噴射是依據(jù)發(fā)動機的速度和負荷。同時我們知道，直噴式汽油機僅僅配備了一個將燃油噴入發(fā)動機燃燒室的燃油噴射閥（汽缸內燃油噴射器）。在一個包括汽缸內燃油噴射器的高壓燃油的高壓燃油系統(tǒng)中，被高壓油泵所加壓的燃油通過一個傳送管道而被供應到汽缸內燃油噴射器中。然后，這個汽缸內燃油噴射將高壓燃油噴入內燃機每個汽缸的燃燒室中。?
總而言之，我們知道柴油機有一個共同的橫桿類型的燃油噴射系統(tǒng)，在這個共同的橫桿類型的燃油噴射系統(tǒng)中，被高壓油泵所加壓的燃油被存儲在共同的橫桿中。通過電磁閥的開啟和關閉將共同橫桿中的高壓燃油噴射到柴油機的每個汽缸的燃燒室中。?
為了增加這種類型內燃機的燃油壓力，提供了一種與內燃機的曲軸相連的凸輪推桿所驅動的高壓燃油泵。?
日本申請的專利號為：JP-A-2005-139923的專利介紹了一個當內燃機所需燃油的數(shù)量很少時，能減少針對噪聲的內燃機高壓燃油供應系統(tǒng)。例如，待機時，能將必要數(shù)量輸送到內燃機的全部工作領域。這種內燃機的高壓燃油供應有一個有兩個獨立柱塞式的高壓燃油泵，他們中有一個溢流閥將溢流出的燃油吸取到被一個汽缸和在汽缸中前后移動的柱塞所分開的壓力室中，當燃油從壓力室中加壓和輸送到高壓燃油系統(tǒng)時，燃油輸送的數(shù)量是通過控制溢流閥的開啟和關閉來調整的。在這些高壓燃油泵之一的是在首次高壓燃油泵中提起的柱塞的量很小，另外一個高壓燃油泵是一個二次高壓燃油泵，在其中說提起的柱塞的量較大?？傊谶@兩個高壓燃油泵中，內燃機的高壓燃油供應系統(tǒng)中包括了控制方式。這種控制每個高壓油泵的溢流閥的控制方式是依據(jù)內燃機所需燃油量，如當所需燃油量較少時，燃油的加壓和輸送僅使用一次高壓油泵；當所需燃油較大時，燃油的加壓和輸送，則要使用二次高壓油泵。?
依據(jù)這種內燃機的高壓燃油供應系統(tǒng)，兩個高壓燃油泵，一次高壓燃油泵有一個提升量較的柱塞，以致于壓力增加速度較慢。那就是，有了這個高壓燃油供應系統(tǒng)，當所需燃油數(shù)量較少時所產生的振動噪聲能夠通過控制高壓燃油泵的溢流閥得到很好的降低，以致于當內燃機所需的燃油量較小，如待機時，只要一次高壓燃油泵工作。在另一方面，二次高壓油泵有一個提升量較大的柱塞，因而其壓力和輸送量在二次高壓油泵下，可能輸送到內燃機所需燃油的增加處，而這卻是在單依靠一次高壓油泵的輸送是不可能完成的。在這種方法下適當數(shù)量的燃油被輸送到內燃機的整個工作領域，從而當所需燃油量小時，能減小振動噪聲。?
在日本專利局申請的專利號為：JP-A-2005-139923，一個型號為V-8內燃機高壓燃油供應系統(tǒng)中有一個缸內噴射器，在每一個汽缸中配備了一個高壓油泵。與燃油箱相連的低壓燃油通道分支的末端被連接到這些高壓油泵的端口上。對每一油泵組，脈動衰減節(jié)流閥被安裝在低壓燃油通道的分支部與連接端口部分的中間處。當高壓油泵工作時，這個脈動衰減節(jié)流閥迫使在低壓燃油通道中的燃油壓力跳動。在發(fā)動機啟動時，這種直噴發(fā)動機僅僅有一個缸內燃油噴射器，燃油不能通過高壓燃油輸送，直到發(fā)動機運動。因此，低壓燃油通過一個裝置泵輸送到燃油噴射處進行缸內噴射。因此，脈動衰減節(jié)流閥被設計成提供高壓管道系統(tǒng)與低壓管道之間的溝通。例如，圖6是這樣的脈動阻尼器215剖視圖。圖7是一個截面視圖沿線七至圖6，圖8是沿線剖面圖第八至圖7。在圖所示，圖6至8，溝槽223A，223B，223C和D是在底面（即在圖8上表面提供的）表示，對一個緊靠一個聯(lián)系的脈動阻尼器215和226。因此，當進給壓力低時，彈簧226D按下一個與226A相聯(lián)系，構成進222和224的插座上表面。其這樣的結構是，即使壓力是由彈簧226D應用，溝槽223A，223B，223C和223D使燃料從222入口（即給水泵端）交付流入出口224（即高壓燃油泵方如在圖虛線所示），即圖8。另一方面，如上所述，一個是已知的，其中包括發(fā)動機，每個汽缸，在汽缸燃油噴射器的注入一個發(fā)動機燃燒室的燃料和燃料噴射器的進氣通道的攝入量是通過注入燃料。在這個引擎，注入在汽缸噴油器和燃料噴射器之間的燃料的劃分是根據(jù)發(fā)動機的轉速和內燃發(fā)動機的負荷。這款發(fā)動機的脈動阻尼器如圖所示6至8。?
然而，在這種發(fā)動機中產生了接下來的一些問題。當通過進氣管道燃油噴射器噴射燃油啟動發(fā)動機時。當在發(fā)動機啟動時通過一個裝置泵輸送燃油時，需要被用于索取燃油的管道的容積變成十分大。那樣的話，當發(fā)動機從進氣通道燃油噴射器噴入的燃油而啟動，盡管事實是燃油能通過在低壓油管道中的裝置泵將燃油輸送到進氣管燃油噴射器中，脈動衰減節(jié)流閥被構造成將高壓管道系統(tǒng)與低壓管道系統(tǒng)之一溝通或打開。因此，燃油不可能通過裝置泵輸送到進口通道燃油噴射器中，除非低壓管道與高壓管道都被用于索取燃油。由于這樣的結果，它需要時間緩慢地提高壓力，因此，反而影響了穩(wěn)定性（增加了啟動時間）。?
發(fā)明總結?
這個發(fā)明因此為內燃機提供了一個燃油供應系統(tǒng)，其能提高由將燃油在較高壓力下將燃油噴入汽缸的燃油噴射機構（缸內燃油噴射）和將燃油噴入進氣通道或進氣端口的燃油噴射機構（進氣通道燃油噴射）組成的內燃機的穩(wěn)定性。?
一方面這個發(fā)明涉及了內燃機燃油供應系統(tǒng)，其包括了一個供應被低壓油泵所加壓的燃油的低壓供應通道，并且將其送到進氣通道燃油噴射的地壓燃油噴射機構中去；一個分支來自低壓燃油供應通道的岔口，并且將燃油供應到被內燃機所驅動的高壓油泵中；一個供應被高壓油泵所加壓的燃油的高壓供應通道，并且將其送到汽缸內燃油噴射的高壓燃油噴射機構中；在高壓油泵的靠近進氣道的一側安裝了脈動衰減機構，這個脈動衰減機構關閉了低壓燃油供應通道和高壓燃油供應通道之間的溝通，當?shù)蛪喝加凸ǖ乐械娜加蛪毫Φ陀陬A先設定的值時。?
依據(jù)第一方面的情況，在內燃機啟動階段，這個被內燃機所驅動的高壓泵不能工作，在這種情況下，內燃機通過噴射被來自低壓燃油噴射機構的低壓泵所加壓的經(jīng)過低壓燃油供應通道的燃油而啟動。在這種情況下，在內燃機的啟動階段，考慮到低壓燃油供應通道中的燃油壓力較低，脈動衰減機構關閉了低壓燃油通道與高壓燃油通道之間的通路。因此，燃油只有使用低壓燃油泵將低壓燃油供應通道中的燃油輸送到低壓燃油噴射機構中去。相應地，這里不需要高壓燃油供應通道去供油，而用低壓油泵，也就是說提供低壓燃油供油通道和高壓泵之間通道的低壓燃油供應通道和分支通道。能夠快速索取燃油，同時燃油能夠快速地從低壓燃油噴射機構中噴出。因此，配備了將燃油在較高壓力下將燃油噴入汽缸的燃油噴射機構和將燃油噴入進氣通道或進氣端口的內燃機的穩(wěn)定能夠被提高。