JPH0278729A - Fuel injection method at diesel engine - Google Patents
Fuel injection method at diesel engineInfo
- Publication number
- JPH0278729A JPH0278729A JP63230565A JP23056588A JPH0278729A JP H0278729 A JPH0278729 A JP H0278729A JP 63230565 A JP63230565 A JP 63230565A JP 23056588 A JP23056588 A JP 23056588A JP H0278729 A JPH0278729 A JP H0278729A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- combustion
- main fuel
- injected
- main
- 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
- 239000000446 fuel Substances 0.000 title claims abstract description 89
- 238000002347 injection Methods 0.000 title claims abstract description 29
- 239000007924 injection Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims description 11
- 238000002485 combustion reaction Methods 0.000 claims abstract description 32
- 239000000295 fuel oil Substances 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 230000007547 defect Effects 0.000 abstract 1
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 12
- 230000000694 effects Effects 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000002360 explosive Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0696—W-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder wall
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0645—Details related to the fuel injector or the fuel spray
- F02B23/0663—Details related to the fuel injector or the fuel spray having multiple injectors per combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0645—Details related to the fuel injector or the fuel spray
- F02B23/0669—Details related to the fuel injector or the fuel spray having multiple fuel spray jets per injector nozzle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/14—Direct injection into combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Fuel-Injection Apparatus (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明はディーゼルエンジンにおける燃料噴射方法に
関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a method of fuel injection in a diesel engine.
（従来の技術及びその問題点）
ディーゼルエンジンにおける燃焼過程には、第１期（着
火遅れ）、第２期（爆発的燃焼期）、第３期（制御燃焼
期）、第４期（後燃え期）のあることが知られている（
例えば、長尾不二夫著「内燃機関講義−上巻−」昭和５
８年３月１０日養賢堂発行の第２２５頁〜第２２６頁参
照）。(Conventional technology and its problems) The combustion process in a diesel engine includes a first stage (ignition delay), a second stage (explosive combustion stage), a third stage (controlled combustion stage), and a fourth stage (afterburning stage). period) is known to exist (
For example, "Lectures on Internal Combustion Engines - Volume 1" by Fujio Nagao, 1932.
(See pages 225 to 226, published by Yokendo on March 10, 1988).
上記後燃え期は、燃料の噴射終了後に、燃焼生成物が急
増し、燃焼速度が次第に低下していく時期である。すな
わちこの時期においては、密集状態にある油粒は、未だ
酸素に接触するには至らず、膨張の進行と共に、拡散と
空気流動とによって順次酸素に接触していき、次第に油
粒が消費されていく状態にある。この期間は通常、全燃
焼期間の５０％を占めており、この期間が長くなると排
気温度が上昇して機関効率が低下し、また黒煙やＨＣ等
の有害排出物の排出量も増大する。The above-mentioned afterburning period is a period in which combustion products rapidly increase after the end of fuel injection, and the combustion rate gradually decreases. In other words, at this stage, the oil particles in a dense state have not yet come into contact with oxygen, but as the expansion progresses, they come into contact with oxygen one by one due to diffusion and air flow, and the oil particles are gradually consumed. I'm in a good condition. This period typically accounts for 50% of the total combustion period, and as this period increases, the exhaust temperature increases, engine efficiency decreases, and the amount of harmful emissions such as black smoke and HC increases.
この発明は上記に鑑みなされたものであって、その目的
は、燃焼後期における燃焼状態を改善し、これにより機
関効率の改善と有害排出物の低減とを行うことが可能な
ディーゼルエンジンにおける燃料噴射方法を提供するこ
とにある。This invention has been made in view of the above, and its object is to provide fuel injection in a diesel engine that can improve the combustion state in the late stage of combustion, thereby improving engine efficiency and reducing harmful emissions. The purpose is to provide a method.
（問題点を解決するための手段）
そこでこの発明のディーゼルエンジンにおける燃料噴射
方法では、主燃料噴射弁から重油等の主燃料を噴射し、
その後、ある時間差をもって副燃料噴射弁から、主燃料
よりも空気消費量が少なく、かつ燃焼速度の早い副燃料
を、上記噴射された主燃料を撹拌する方向に噴射するよ
うにしている。(Means for solving the problem) Therefore, in the fuel injection method for a diesel engine of the present invention, main fuel such as heavy oil is injected from the main fuel injection valve,
Thereafter, at a certain time lag, the auxiliary fuel is injected from the auxiliary fuel injection valve in a direction that agitates the injected main fuel, which consumes less air and has a faster combustion speed than the main fuel.
（作用）
上記ディーゼルエンジンにおける燃料噴射方法において
は、主燃料の燃焼後期の段階で副燃料が噴射される。こ
のとき副燃料は主燃料を撹拌する方向に噴射されるので
、この撹拌効果によって、主燃料と副燃料とが空気、す
わなち酸素に接触する頻度が増大し、これにより燃焼後
期における燃焼状態が改善される。しかも副燃料として
、主燃料よりも空気消費量が少なく、かつ燃焼速度の早
い燃料を使用しているので、副燃料の噴射に起因して燃
焼期間全体が長びくこともない。(Operation) In the above fuel injection method for a diesel engine, the auxiliary fuel is injected at a later stage of combustion of the main fuel. At this time, the auxiliary fuel is injected in a direction that stirs the main fuel, so this stirring effect increases the frequency at which the main fuel and the auxiliary fuel come into contact with air, that is, oxygen. is improved. Furthermore, since a fuel that consumes less air and has a faster combustion rate than the main fuel is used as the auxiliary fuel, the overall combustion period does not become longer due to the injection of the auxiliary fuel.
（実施例）
次にこの発明のディーゼルエンジンにおける燃料噴射方
法の具体的な実施例について、図面を参照しつつ詳細に
説明する。(Example) Next, a specific example of the fuel injection method for a diesel engine of the present invention will be described in detail with reference to the drawings.
第２図において、ｌはシリンダヘッド、２はシリンダラ
イナ、３はピストンをそれぞれ示し、シリンダへラド１
には、主燃料噴射弁４と副燃料噴射弁５とが取着されて
いる。主燃料噴射弁４と副燃料噴射弁５との配置関係は
、第１図のようになっており、主燃料噴射弁４はシリン
ダ室６の中央部の位置に、また副燃料噴射弁５はその側
方の位置にそれぞれ配置されている。上記主燃料噴射弁
４は、重油等の主燃料Ａを放射状に噴射するものであり
、また上記副燃料噴射弁５は、例えばメタノール等の副
燃料Ｂを上記主燃料Ａと交差する方向に噴射するもので
ある。すなわち副燃料Ｂの噴射により、主燃料Ａ及びそ
の周辺の空気Ｃを旋回させて撹拌し得るようなされてい
る訳である。また上記において、好ましい副燃料Ｂとし
てメタノールを例示しであるが、これはメタノールが重
油よりも、空気消費量が少なく、かつ燃焼速度の早い燃
料であるためであるが、特にこれに限定される訳ではな
い。In Fig. 2, l indicates the cylinder head, 2 indicates the cylinder liner, and 3 indicates the piston.
A main fuel injection valve 4 and an auxiliary fuel injection valve 5 are attached to the . The arrangement relationship between the main fuel injection valve 4 and the auxiliary fuel injection valve 5 is as shown in FIG. They are placed on each side. The main fuel injection valve 4 injects the main fuel A such as heavy oil radially, and the auxiliary fuel injection valve 5 injects the auxiliary fuel B such as methanol in a direction intersecting the main fuel A. It is something to do. That is, by injecting the auxiliary fuel B, the main fuel A and the air C around it can be swirled and agitated. Furthermore, in the above, methanol is exemplified as a preferable subfuel B, but this is because methanol is a fuel that consumes less air and has a faster burning rate than heavy oil, but it is not particularly limited to this. It's not a translation.
そして上記のような構成において、この実施例方法では
、主燃料噴射弁４から主燃料Ａを噴射した後、さらに一
定の時間（例えば１０ｍ５ｅｃ）が経過した後、つまり
主燃料Ａの燃焼後期において、副燃料噴射弁５から副燃
料Ｂを噴射する。そうすると主燃料Ａ、空気Ｃ１及び副
燃料Ｂは、旋回、撹拌されることになるが、この撹拌効
果によって、主燃料Ａと副燃料Ｂとが空気Ｃに出合う頻
度が増加し、これにより燃焼後期における燃焼状態が改
善されることになる。つまり従来は、密集状態にある燃
料粒は、膨張の進行に伴う拡散と空気流動とによって空
気と出合う燃焼形態であった訳であるが、上記実施０例
では、副燃料Ｂの噴射により、強制的に燃料Ａ、Ｂと空
気Ｃとを混合させるようにしであるので、前述のように
燃焼状態を改善し得ることになる。さらに重油以外の燃
料、例えばメタノールという代替燃料を使用し得ること
もその利点である。In the above configuration, in this embodiment method, after a certain period of time (for example, 10 m5ec) has elapsed after the main fuel A is injected from the main fuel injection valve 4, that is, in the late stage of combustion of the main fuel A, The auxiliary fuel B is injected from the auxiliary fuel injection valve 5. In this case, main fuel A, air C1, and auxiliary fuel B will be swirled and stirred, but this stirring effect will increase the frequency at which main fuel A and auxiliary fuel B encounter air C, and this will cause This results in improved combustion conditions. In other words, in the past, fuel particles in a dense state encountered air through diffusion and air flow as they expanded, but in Example 0 above, the injection of auxiliary fuel B caused forced combustion. Since the fuels A and B are mixed with the air C, the combustion condition can be improved as described above. Another advantage is that alternative fuels other than heavy oil, such as methanol, can be used.
また副燃料Ｂとして、主燃料Ａよりも空気消費量が少な
く、かつ燃焼速度の早い燃料を使用していることから、
副燃料Ｂの噴射が原因で燃焼期間全体が長びくといった
不具合が発生することはないが、この点をより一層確実
にするためには、副燃料Ｂを全体燃料の２７２０％の範
囲内にしておくのが好ましい。In addition, since the secondary fuel B uses a fuel that consumes less air and has a faster combustion rate than the main fuel A,
Injection of auxiliary fuel B will not cause problems such as lengthening of the entire combustion period, but to further ensure this point, auxiliary fuel B should be within the range of 2720% of the total fuel. is preferable.
なおこの発明方法は上記実施例に限られるものではなく
、例えば第３図に示すように、複数の副燃料噴射弁５．
５を使用する等、種々変更して実施することが可能であ
る。Note that the method of the present invention is not limited to the above embodiment, and for example, as shown in FIG. 3, a plurality of auxiliary fuel injection valves 5.
It is possible to implement it with various changes, such as using 5.
（発明の効果）
この発明のディーゼルエンジンにおける燃料噴射方法で
は、主燃料の燃焼後期の段階において副燃料を噴射し、
これにより主燃料、副燃料と空気とを強制的に撹拌する
ようにしであるので、燃焼状態が改善でき、これにより
機関効率の向上、及び有害排出物の低減という効果が生
じることになる。この場合、副燃料として、空気消費量
が少なく、かつ燃焼速度の早い燃料を使用していること
から、燃焼期間が長びくという不具合の発生で防止でき
ることになる。(Effects of the Invention) In the fuel injection method for a diesel engine of the present invention, the auxiliary fuel is injected in the latter stage of combustion of the main fuel,
As a result, the main fuel, auxiliary fuel, and air are forcibly stirred, so that the combustion state can be improved, resulting in the effects of improving engine efficiency and reducing harmful emissions. In this case, since a fuel with a low air consumption and a high combustion rate is used as the auxiliary fuel, the problem of a prolonged combustion period can be prevented.
第１図はこの発明のディーゼルエンジンにおける燃料噴
射方法を実施するに際して使用するディ−ゼルエンジン
の説明図、第２図はその樅断ｊ第３図はディーゼルエン
ジンの他の構造例を説明図である。
４・・・主燃料噴射弁、５・・・副燃料噴Ａ・・・主燃
料、Ｂ・・・副燃料。
特許出願人 川崎重工業株式％式％
畠すメ′にへＡと（
第２図Fig. 1 is an explanatory diagram of a diesel engine used when implementing the fuel injection method for a diesel engine of the present invention, Fig. 2 is an explanatory diagram of its cross section, and Fig. 3 is an explanatory diagram of another structural example of the diesel engine. be. 4...Main fuel injection valve, 5...Auxiliary fuel injection A...Main fuel, B...Auxiliary fuel. Patent applicant: Kawasaki Heavy Industries, Ltd.
Claims (1)
、ある時間差をもって副燃料噴射弁から、主燃料よりも
空気消費量が少なく、かつ燃焼速度の早い副燃料を、上
記噴射された主燃料を撹拌する方向に噴射することを特
徴とするディーゼルエンジンにおける燃焼噴射方法。1. A main fuel such as heavy oil is injected from the main fuel injection valve, and then, at a certain time lag, the auxiliary fuel, which consumes less air than the main fuel and has a faster combustion rate, is injected from the auxiliary fuel injection valve to the injected main fuel. A combustion injection method for a diesel engine characterized by injecting in a direction that stirs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63230565A JP2660433B2 (en) | 1988-09-14 | 1988-09-14 | Fuel injection method for diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63230565A JP2660433B2 (en) | 1988-09-14 | 1988-09-14 | Fuel injection method for diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0278729A true JPH0278729A (en) | 1990-03-19 |
| JP2660433B2 JP2660433B2 (en) | 1997-10-08 |
Family
ID=16909745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63230565A Expired - Lifetime JP2660433B2 (en) | 1988-09-14 | 1988-09-14 | Fuel injection method for diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2660433B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4127617C1 (en) * | 1991-08-21 | 1993-04-15 | Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De | |
| EP0845589A1 (en) * | 1996-11-27 | 1998-06-03 | Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh | Direct injection Diesel engine with combustion chamber in piston |
| JP2002030937A (en) * | 2000-04-28 | 2002-01-31 | Gureitochiren:Kk | Engine and system |
| JP2014020278A (en) * | 2012-07-18 | 2014-02-03 | Hino Motors Ltd | Internal combustion engine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5250403A (en) * | 1975-10-20 | 1977-04-22 | Niigata Eng Co Ltd | Combustion apparatus of diesel engine |
| JPS5596318A (en) * | 1979-01-13 | 1980-07-22 | Kloeckner Humboldt Deutz Ag | Method of and apparatus for operating air compression selffignition internal combustion engine |
| JPS56118517A (en) * | 1980-02-26 | 1981-09-17 | Hitachi Constr Mach Co Ltd | Method of combustion in diesel engine |
| JPS5738614A (en) * | 1980-08-20 | 1982-03-03 | Nippon Jidosha Kenkyusho | Internal combustion engine |
-
1988
- 1988-09-14 JP JP63230565A patent/JP2660433B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5250403A (en) * | 1975-10-20 | 1977-04-22 | Niigata Eng Co Ltd | Combustion apparatus of diesel engine |
| JPS5596318A (en) * | 1979-01-13 | 1980-07-22 | Kloeckner Humboldt Deutz Ag | Method of and apparatus for operating air compression selffignition internal combustion engine |
| JPS56118517A (en) * | 1980-02-26 | 1981-09-17 | Hitachi Constr Mach Co Ltd | Method of combustion in diesel engine |
| JPS5738614A (en) * | 1980-08-20 | 1982-03-03 | Nippon Jidosha Kenkyusho | Internal combustion engine |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4127617C1 (en) * | 1991-08-21 | 1993-04-15 | Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De | |
| EP0845589A1 (en) * | 1996-11-27 | 1998-06-03 | Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh | Direct injection Diesel engine with combustion chamber in piston |
| JP2002030937A (en) * | 2000-04-28 | 2002-01-31 | Gureitochiren:Kk | Engine and system |
| JP2014020278A (en) * | 2012-07-18 | 2014-02-03 | Hino Motors Ltd | Internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2660433B2 (en) | 1997-10-08 |
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