JPS6328206B2 - - Google Patents
Info
- Publication number
- JPS6328206B2 JPS6328206B2 JP58030625A JP3062583A JPS6328206B2 JP S6328206 B2 JPS6328206 B2 JP S6328206B2 JP 58030625 A JP58030625 A JP 58030625A JP 3062583 A JP3062583 A JP 3062583A JP S6328206 B2 JPS6328206 B2 JP S6328206B2
- Authority
- JP
- Japan
- Prior art keywords
- main injection
- injection valve
- pilot
- recess
- injection
- 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.)
- Expired
Links
- 238000002347 injection Methods 0.000 claims description 75
- 239000007924 injection Substances 0.000 claims description 75
- 239000000446 fuel Substances 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000000567 combustion gas Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007921 spray 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
- F02B23/04—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being subdivided into two or more chambers
-
- 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
- F02B23/0696—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
- 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
- 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
- F02B23/0678—Unconventional, complex or non-rotationally symmetrical shapes of the combustion space, e.g. flower like, having special shapes related to the orientation of the fuel spray jets
- F02B23/0687—Multiple bowls in the piston, e.g. one bowl per fuel spray jet
-
- 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
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は排気ガス中のNOx成分を低減し、燃
費を低減させた直噴式デイーゼルエンジンのパイ
ロツト噴射装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pilot injection device for a direct injection diesel engine that reduces NOx components in exhaust gas and reduces fuel consumption.
（従来の技術）
直噴式デイーゼルエンジンにおいて、主噴射に
先立つてパイロツト噴射を行わせ、以てデイーゼ
ルノツクをおさえるようにすることは従来公知で
ある。(Prior Art) In a direct-injection diesel engine, it is conventionally known to perform pilot injection prior to main injection to suppress diesel engine knock.
一方、パイロツト噴射の方向及び量を適当に選
定することにより排気中のNOx成分の低減、燃
焼効率の向上を図ることも従来公知である。（特
願昭54−76577号）
（発明が解決しようとする問題点）
本発明者による先の特開昭54−76577号におい
ては、パイロツト噴射によつて予め火炎塊もしく
は高温既燃ガス塊を主噴射弁の噴口近傍に形成
し、火炎塊等を貫通するように主噴射を行わせる
と排気中のNOx成分が低減し、燃費も低減する
ことを提案した。 On the other hand, it is also conventionally known to reduce NOx components in exhaust gas and improve combustion efficiency by appropriately selecting the direction and amount of pilot injection. (Patent Application No. 54-76577) (Problems to be Solved by the Invention) In the previous Japanese Patent Application Laid-open No. 54-76577 by the present inventor, a flame mass or a high-temperature burnt gas mass is generated in advance by pilot injection. We proposed that if the main injection valve is formed near the nozzle of the main injector and the main injection is performed so as to penetrate the flame mass, the NOx component in the exhaust gas will be reduced and fuel consumption will also be reduced.
ところが、当該先の出願は予燃焼室を対象とす
るものであり、直噴式デイーゼルエンジンを対象
とするものではなかつた。 However, the earlier application was directed to a pre-combustion chamber and not to a direct injection diesel engine.
そこで、本発明は上記公知技術の改良に関し、
直噴式デイーゼルエンジンにおいて、NOx低減、
燃費の低減を図つたパイロツト噴射装置を提供せ
んとするにある。 Therefore, the present invention relates to improvement of the above-mentioned known technology,
In direct injection diesel engines, NOx reduction,
The object of the present invention is to provide a pilot injection device that reduces fuel consumption.
（問題点を解決するための手段）
本発明の特徴とする構成は、パイロツト噴射に
よつて予め火炎の塊を作つておき、該火炎塊を貫
通してピストン立のキヤビテイーへ向けて直接主
噴射を行わせるところにある。(Means for Solving the Problems) The feature of the present invention is that a flame mass is created in advance by pilot injection, and the main injection is carried out directly to the cavity of the piston by penetrating the flame mass. It's about getting people to do it.
（実施例） 以下に、本発明の一実施例を説明する。(Example) An embodiment of the present invention will be described below.
第１図を参照して、ピストン１にはキヤビテイ
ー２が設けられ、シリンダヘツド３には主噴射弁
４が貫通して設置されている。主噴射弁４は主噴
射Ｐをキヤビテイー２内に行うものである。主噴
射弁４の噴口が位置するシリンダヘツド３には凹
部５が形成されている。該凹部５に臨ませて、パ
イロツト噴射弁６が設けられ、パイロツト噴射弁
６は凹部５に主噴射と同一燃料をパイロツト噴射
した時、凹部５内に火炎塊もしくは高温既燃ガス
塊を主噴射弁４の噴口近傍に形成するものであ
り、パイロツト噴射による燃焼は凹部５内にのみ
拡がるものとなつている。 Referring to FIG. 1, a piston 1 is provided with a cavity 2, and a cylinder head 3 is provided with a main injection valve 4 extending therethrough. The main injection valve 4 performs main injection P into the cavity 2. A recess 5 is formed in the cylinder head 3 where the injection port of the main injection valve 4 is located. A pilot injection valve 6 is provided facing the recess 5, and when the same fuel as the main injection is pilot injected into the recess 5, the pilot injection valve 6 injects a flame mass or a high temperature burnt gas mass into the recess 5 as the main injection. It is formed near the nozzle of the valve 4, so that combustion caused by pilot injection spreads only within the recess 5.
上記構成の作用は以下のとおりである。 The operation of the above configuration is as follows.
まず、ピストン１が上死点の直前となると、パ
イロツト噴射弁６から凹部５内にパイロツト噴射
される。このため、凹部５内に火炎塊等Ｆが生
じ、そこに高温部分が発生する。次に、主噴射弁
４から主噴射Ｐが行なわれるが、主噴射Ｐは火炎
塊等Ｆを貫通するよう噴射されるので主噴射によ
る初期燃焼がスムーズに開始されるものとなる。
このために急激な温度上昇がなくなり、燃焼ガス
中のNOxが低減し、その上、燃焼過程も改善さ
れるので排気煙も低減して燃費が良くなるもので
ある。 First, when the piston 1 is just before the top dead center, pilot injection is performed from the pilot injection valve 6 into the recess 5. For this reason, a flame mass or the like F is generated in the recess 5, and a high temperature portion is generated there. Next, the main injection P is performed from the main injection valve 4, and since the main injection P is injected so as to penetrate the flame mass F, etc., initial combustion by the main injection starts smoothly.
This eliminates a sudden temperature rise, reduces NOx in the combustion gas, and also improves the combustion process, which reduces exhaust smoke and improves fuel efficiency.
尚、上記において、パイロツト噴射量はNOx
低減量と密接な関係にあることは先の出願と同じ
であり、全噴射量に対してパイロツト噴射割合が
０〜10％の間では噴射割合が増大する程、NOx
が低減するが、10％を越えると殆ど変化しないも
のとなつている。 In addition, in the above, the pilot injection amount is NOx
It is the same as the previous application that there is a close relationship with the reduction amount, and when the pilot injection ratio is between 0 and 10% of the total injection amount, the higher the injection ratio is, the lower the NOx
decreases, but there is almost no change when it exceeds 10%.
又、凹部５の形状及び大きさは次のような定性
的特性を有しておればよい。即ち、パイロツト噴
射の噴霧が保持され、かつ火炎塊等が凹部５に維
持される程度の凹部５であればよく、必ずしも閉
鎖状態の空間でなくともよい。 Further, the shape and size of the recess 5 may have the following qualitative characteristics. That is, it is sufficient that the recess 5 is large enough to retain the spray of the pilot injection and maintain the flame mass, etc. in the recess 5, and does not necessarily have to be a closed space.
第２図は本発明の他の実施例を示すもので、主
噴射弁７の噴口がキヤビテイー８内に突入するご
とく設けられ、キヤビテイー８内の中心付近には
凹所９が形成されている。凹所９はピストン１０
が上死点となつた時、主噴射弁の噴口が嵌入され
るものとなつている。第３図をも参照して、凹所
９の壁部には主噴射Ｐの数だけの切り欠きｓがあ
り、主噴射Ｐがキヤビテイー８内壁面へ到達でき
るようになつている。パイロツト噴射弁１１は凹
所９内へパイロツト噴射するものであり、シリン
ダヘツド１２に取り付けられている。 FIG. 2 shows another embodiment of the present invention, in which the nozzle port of the main injection valve 7 is provided so as to protrude into the cavity 8, and a recess 9 is formed near the center of the cavity 8. Recess 9 is piston 10
When the main injection valve reaches top dead center, the nozzle of the main injection valve is inserted. Referring also to FIG. 3, the wall of the recess 9 has cutouts s equal to the number of main injections P, so that the main injections P can reach the inner wall surface of the cavity 8. The pilot injection valve 11 is for pilot injection into the recess 9 and is attached to the cylinder head 12.
上記構成によつても第１図の実施例と同様の効
果が得られるものとなる。 Even with the above configuration, the same effects as the embodiment shown in FIG. 1 can be obtained.
又、第４図に示すように、主噴射Ｐの数だけの
花弁状のキヤビテイー１３をピストン１４上に形
成し、その中心に凹所１５を形成する構成とする
こともできる。 Alternatively, as shown in FIG. 4, the number of petal-shaped cavities 13 corresponding to the number of main injections P may be formed on the piston 14, and a recess 15 may be formed in the center thereof.
（発明の効果）
以上説明したように、本発明によると、直噴式
デイーゼルエンジンにおいて、まず主噴射弁噴口
近傍に火炎塊等を形成し、次にその火炎塊等を貫
通して主噴射を行わせるものとなる。このため、
主噴射による初期燃焼がながらかとなつて急激な
温度上昇が抑えられ、NOxの生成を抑えるもの
となる。(Effects of the Invention) As explained above, according to the present invention, in a direct injection diesel engine, a flame mass or the like is first formed near the main injection valve nozzle, and then the main injection is performed by penetrating the flame mass or the like. It becomes something that can be done. For this reason,
The initial combustion caused by the main injection is slow, which suppresses a sudden temperature rise and suppresses the production of NOx.
又、パイロツト噴射による火炎塊等によつてよ
り完全な燃焼が得られ、燃費が低減する。 Further, more complete combustion can be achieved by the flame mass generated by pilot injection, and fuel consumption can be reduced.
更に、パイロツト噴射を全噴射量の10％とする
と、最も良いNOx低減効果が得られるものとな
る。 Furthermore, if the pilot injection is 10% of the total injection amount, the best NOx reduction effect will be obtained.
第１図は本発明の一実施例を示す断面図、第２
図は本発明の他の実施例を示す断面図、第３図は
第２図のピストンの平面図、第４図はピストンの
他の実施例を示す平面図である。
４，７：主噴射弁、５：凹部、６，１１：パイ
ロツト噴射弁、９，１５：凹所。
FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
3 is a plan view of the piston of FIG. 2, and FIG. 4 is a plan view of another embodiment of the piston. 4, 7: Main injection valve, 5: Recess, 6, 11: Pilot injection valve, 9, 15: Recess.
Claims (1)
ビテイーへ向けて主噴射弁から燃料を主噴射する
ようにしたデイーゼルエンジンにおいて、 前記主噴射弁の先端が位置するシリンダヘツド
部分に凹所を設け、前記主噴射弁による主噴射に
先立つて該凹所内に主噴射と同一燃料をパイロツ
ト噴射するパイロツト噴射弁を該凹所に臨ませて
設け、該パイロツト噴射によつて生じた火炎塊も
しくは高温既燃ガス塊を貫通して主噴射を行うよ
うに前記主噴射弁の噴口を設けたことを特徴とす
る直噴式デイーゼルエンジンのパイロツト噴射装
置。 ２ ピストン頂部にキヤビテイーを設け、該キヤ
ビテイーへ向けて主噴射弁から燃料を主噴射する
ようにしたデイーゼルエンジンにおいて、 前記主噴射弁の先端をシリンダヘツドからピス
トンのキヤビテイーへ向けて突出して設け、前記
ピストンが圧縮上死点となつた時に前記主噴射弁
の先端が位置するキヤビテイー近傍に凹部を形成
し、前記主噴射弁による主噴射に先立つて該凹部
内にパイロツト噴射を行うパイロツト噴射弁を設
け、該パイロツト噴射によつて生じた火炎塊もし
くは高温既燃ガス塊を貫通して主噴射を行うよう
に前記主噴射弁の噴口を設けたことを特徴とする
直噴式デイーゼルエンジンのパイロツト噴射装
置。[Scope of Claims] 1. In a diesel engine having a cavity at the top of the piston, and in which fuel is mainly injected from the main injection valve toward the cavity, a recess is provided in the cylinder head portion where the tip of the main injection valve is located. A pilot injection valve is provided facing the recess for pilot-injecting the same fuel as the main injection into the recess prior to the main injection by the main injection valve, and a flame mass or a flame mass generated by the pilot injection is provided. 1. A pilot injection device for a direct-injection diesel engine, characterized in that the main injection valve has a nozzle so as to perform main injection by penetrating a high-temperature burnt gas mass. 2. In a diesel engine having a cavity at the top of the piston, and in which fuel is mainly injected from the main injection valve toward the cavity, the tip of the main injection valve is provided to protrude from the cylinder head toward the cavity of the piston, and the A recess is formed in the vicinity of the cavity where the tip of the main injection valve is located when the piston reaches compression top dead center, and a pilot injection valve is provided that performs pilot injection within the recess prior to main injection by the main injection valve. A pilot injection device for a direct-injection diesel engine, characterized in that the main injection valve is provided with a nozzle port so as to perform main injection by penetrating a flame mass or a high-temperature burnt gas mass produced by the pilot injection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58030625A JPS59155529A (en) | 1983-02-25 | 1983-02-25 | Pilot injection device of direct injection type diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58030625A JPS59155529A (en) | 1983-02-25 | 1983-02-25 | Pilot injection device of direct injection type diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59155529A JPS59155529A (en) | 1984-09-04 |
| JPS6328206B2 true JPS6328206B2 (en) | 1988-06-07 |
Family
ID=12309031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58030625A Granted JPS59155529A (en) | 1983-02-25 | 1983-02-25 | Pilot injection device of direct injection type diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59155529A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2500944Y2 (en) * | 1985-11-08 | 1996-06-12 | 日産自動車株式会社 | Direct injection diesel engine combustion chamber structure |
| JP2536351B2 (en) * | 1991-03-22 | 1996-09-18 | いすゞ自動車株式会社 | Direct injection internal combustion engine |
| JP2578820Y2 (en) * | 1991-11-29 | 1998-08-20 | 三菱自動車工業株式会社 | Diesel engine fuel injection system |
| JPH0610673A (en) * | 1992-06-30 | 1994-01-18 | Shinnenshiyou Syst Kenkyusho:Kk | Direct injection type diesel engine |
| FR2822192B1 (en) * | 2001-03-16 | 2003-05-16 | Renault | HEAD ROOF |
| DE102004004391A1 (en) * | 2004-01-29 | 2005-08-11 | Daimlerchrysler Ag | Direct injection internal combustion engine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS549244A (en) * | 1977-06-23 | 1979-01-24 | Ciba Geigy Ag | Process for preparing phenylalkylsulfone |
| JPS5738614A (en) * | 1980-08-20 | 1982-03-03 | Nippon Jidosha Kenkyusho | Internal combustion engine |
-
1983
- 1983-02-25 JP JP58030625A patent/JPS59155529A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS549244A (en) * | 1977-06-23 | 1979-01-24 | Ciba Geigy Ag | Process for preparing phenylalkylsulfone |
| JPS5738614A (en) * | 1980-08-20 | 1982-03-03 | Nippon Jidosha Kenkyusho | Internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59155529A (en) | 1984-09-04 |
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