JP2675935B2 - Direct injection diesel engine combustion method - Google Patents
Direct injection diesel engine combustion methodInfo
- Publication number
- JP2675935B2 JP2675935B2 JP3272377A JP27237791A JP2675935B2 JP 2675935 B2 JP2675935 B2 JP 2675935B2 JP 3272377 A JP3272377 A JP 3272377A JP 27237791 A JP27237791 A JP 27237791A JP 2675935 B2 JP2675935 B2 JP 2675935B2
- Authority
- JP
- Japan
- Prior art keywords
- injection
- combustion
- combustion chamber
- fuel
- piston
- 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 - Lifetime
Links
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
- F02B23/0618—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 having in-cylinder means to influence the charge motion
- F02B23/0627—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 having in-cylinder means to influence the charge motion having additional bores or grooves machined into the piston for guiding air or charge flow to the piston bowl
-
- 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
- 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
- F02B23/0603—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 at least part of the interior volume or the wall of the combustion space being made of material different from the surrounding piston part, e.g. combustion space formed within a ceramic part fixed to a metal piston head
-
- 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
- F02B23/0618—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 having in-cylinder means to influence the charge motion
- F02B23/0621—Squish flow
-
- 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
【０００１】[0001]
【産業上の利用分野】本発明は、スモークおよびＮＯX
の大幅な低減を図るための直接噴射式ディーゼル機関の
燃焼方法に関する。BACKGROUND OF THE INVENTION This invention is, smoke and NO X
The present invention relates to a combustion method of a direct injection diesel engine for achieving a significant reduction of
【０００２】[0002]
【従来の技術】直接噴射式ディーゼル機関において、現
在広く用いられている低圧噴射の場合、噴霧はノズル近
傍で着火した後、全体が火炎に包まれながら進行し、こ
の時、噴霧は、空気と同時に自己の生成した既燃ガスを
巻き込みながら燃焼するので、噴霧中心部において高温
部、酸素不足部が形成されスモークの生成要因となり、
既燃ガスの巻き込みはマイナス要因として働くと言われ
ている。このためスモークを低減するには、燃料と空気
を迅速に混合する必要があり、スワール、スキッシュ等
により空気利用率を向上する方法が採られているが、こ
れでは着火遅れの間の燃料、空気混合速度も増大するた
め、予混合燃焼の増加により燃焼初期の熱発生率が増大
し、ＮＯX の増大を招くという相反する問題を有してお
り、これがスモークとＮＯX の同時低減を困難にしてい
る。2. Description of the Related Art In the case of low-pressure injection, which is widely used in direct injection type diesel engines, the spray is ignited in the vicinity of the nozzle and then progresses while being surrounded by flames. At the same time, it burns while burning the burned gas generated by itself, so a high temperature part and an oxygen deficient part are formed in the center of the spray, which becomes a cause of smoke generation,
It is said that the burning of burned gas acts as a negative factor. Therefore, in order to reduce smoke, it is necessary to mix fuel and air quickly, and a method of improving the air utilization rate by swirling, squishing, etc. has been adopted. since mixing speed also increases, the increase of premixed combustion increases the initial combustion of the heat generation rate has a contradictory problem that causes an increase in NO X, which is difficult to simultaneously reduce the smoke and NO X ing.
【０００３】上記問題を解決するために、高圧噴射（噴
射圧１０００ｋｇ／ｃｍ2 以上）、小噴孔径ノズル、浅
皿燃焼室および低スワールを組合せる方式が知られてい
る。これを図２により説明すると、１はピストン、２は
ピストンリング、３はシリンダライナー、４はガスケッ
ト、５はシリンダヘッド、６はノズル７を有する燃料噴
射弁を示し、ピストン１の頂部には燃焼室９が形成され
ている。ピストン１が上昇し上死点付近に達したとき、
ノズル７から噴射された燃料の噴霧Ｆは、壁面１０近傍
で一気に着火した後、火炎Ｈは、燃焼室９中心に向かっ
て膨張するが、噴射の終了まで中心部は不燃域として残
る。すなわち、噴霧は壁面１０に到達するまで燃焼室９
中心に近い不燃域側で十分に空気を巻き込みながら進行
し、壁面１０側では既燃ガスを導入しながら壁面１０に
衝突する二段の燃焼経路をたどる。高圧噴射の場合、噴
射時期を大幅に遅らせても火がつくため、噴射時期遅延
との組み合わせで、低圧噴射と比較してスモークおよび
ＮＯX の同時低減を図ることができる。In order to solve the above problems, there is known a system in which a high pressure injection (injection pressure of 1000 kg / cm 2 or more), a small injection hole diameter nozzle, a shallow dish combustion chamber and a low swirl are combined. Referring to FIG. 2 , 1 is a piston, 2 is a piston ring, 3 is a cylinder liner, 4 is a gasket, 5 is a cylinder head, and 6 is a fuel injection valve having a nozzle 7. A chamber 9 is formed. When piston 1 rises and reaches near top dead center,
The spray F of the fuel injected from the nozzle 7 ignites at once in the vicinity of the wall surface 10, and then the flame H expands toward the center of the combustion chamber 9, but the central portion remains as a non-combustible region until the end of injection. That is, the spray is kept in the combustion chamber 9 until it reaches the wall surface 10.
On the side of the non-combustible zone near the center, the air flows in while sufficiently entraining air, and on the side of the wall surface 10, the burned gas is introduced and traces a two-stage combustion path that collides with the wall surface 10. In the case of high-pressure injection, even if the injection timing is significantly delayed, ignition will occur. Therefore, in combination with the injection timing delay, it is possible to reduce smoke and NO X simultaneously as compared with low-pressure injection.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、高圧噴
射は低圧噴射と比較して、噴霧のエネルギーが大きいた
め、火炎は噴射エネルギーにより燃焼室９の中心に向か
って広がるのが抑制される。従って、噴霧はノズル７側
で常に新気を導入するのでスモークは大幅に低減する
が、着火までの空気の導入量が多く既燃ガスの巻き込み
が少ないため、前述したように壁面で一気に着火し、同
一噴射タイミングで比較するとどうしてもＮＯX の発生
量が多くなるという問題を有している。However, since the high-pressure injection has a larger energy of spray as compared with the low-pressure injection, the flame is suppressed from spreading toward the center of the combustion chamber 9 due to the injection energy. Therefore, since the spray always introduces fresh air on the nozzle 7 side, smoke is greatly reduced, but since the amount of air introduced until ignition is large and the amount of burned gas entrainment is small, the wall surface is ignited at once as described above. However, when compared at the same injection timing, there is a problem that the amount of NO x generated will inevitably increase.
【０００５】高圧噴射の場合、燃焼室径が小さいと衝突
による空気導入の増加、燃焼室内スワールの増加等によ
り、拡散燃焼初期の熱発生が活発となり、ＮＯX が増加
する。一方、燃焼室径が大きい場合、燃焼室径が小さい
場合と比較して上記の理由により、ＮＯX は低いがスモ
ークが高くなるという特性がある。In the case of high-pressure injection, when the diameter of the combustion chamber is small, heat generation in the initial stage of diffusion combustion becomes active due to an increase in air introduction due to collision, an increase in swirl in the combustion chamber, etc., and NO X increases. On the other hand, when the diameter of the combustion chamber is large, compared to the case where the diameter of the combustion chamber is small, there is a characteristic that NO x is low but smoke is high for the above reason.
【０００６】一般的には、着火迄の混合気形成をできる
だけ抑え、濃混合気の状態で燃焼させ（予混合燃焼の抑
制によるＮＯX の低減）、その後、空気導入の増加を図
る（拡散燃焼の活発化によるスモークの低減）ことがで
きれば理想的である。しかしながら、現状の浅皿燃焼室
は、スモークとＮＯX が最もよくなるような口径として
いるが、上記のような燃焼を実現することは困難であ
り、さらにＮＯX を低減させることは難しい。In general, formation of air-fuel mixture until ignition is suppressed as much as possible, combustion is carried out in a rich air-fuel mixture state (reduction of NO X by suppression of premixed combustion), and then air introduction is increased (diffusion combustion). It is ideal to be able to reduce the smoke caused by the activation of. However, the current shallow dish combustion chamber has a diameter that maximizes smoke and NO x, but it is difficult to realize the above combustion, and it is difficult to further reduce NO x .
【０００７】本発明は、上記課題を解決するものであっ
て、燃焼室の構造を従来の単純な浅皿燃焼室より改善す
るだけで、スモーク及びＮＯX を同時にかつ大幅に低減
させることができる直接噴射式ディーゼル機関の燃焼方
法を提供することを目的とする。[0007] The present invention has been made to solve the above problems, the structure of the combustion chamber only improve than conventional simple shallow dish combustion chamber, it is possible to simultaneously and significantly reduce the smoke and NO X Combustion method of direct injection diesel engine
The purpose is to provide the law .
【０００８】[0008]
【課題を解決するための手段】そのために本発明の直接
噴射式ディーゼル機関の燃焼方法は、ピストン１の頂部
に窪み部１ｃを有するように形成された燃焼室９と、シ
リンダヘッド５に配設された燃料噴射弁６と、該燃料噴
射弁のノズル７に設けられた複数の噴孔と、前記燃焼室
９の上部を覆うようにピストン１に固定された蓋体１２
と、該蓋体の中央部に形成された筒状壁１３と、前記ノ
ズル７の噴孔からの燃料噴射方向に前記燃焼室の内外を
連通するように前記蓋体１２に形成された噴口１５とを
備え、前記噴孔からの燃料を前記窪み部１ｃに衝突させ
濃混合気状態で燃焼させた後、ピストン１の下降に伴い
前記筒状壁１３に衝突させ拡散燃焼させることを特徴と
する。なお、上記構成に付加した番号は、本発明の理解
を容易にするために図面と対比させるためのもので、こ
れにより本発明の構成が何ら限定されるものではない。Therefore, in the combustion method for a direct injection type diesel engine of the present invention, a combustion chamber 9 formed to have a recess 1c at the top of a piston 1 and a cylinder head 5 are provided. Fuel injection valve 6, a plurality of injection holes provided in the nozzle 7 of the fuel injection valve, and a lid 12 fixed to the piston 1 so as to cover the upper portion of the combustion chamber 9.
And a cylindrical wall 13 formed in the center of the lid, and an injection port 15 formed in the lid 12 so as to communicate the inside and outside of the combustion chamber in the fuel injection direction from the injection hole of the nozzle 7. And the fuel from the injection hole is collided with the recess 1c.
It is characterized in that after burning in a rich air-fuel mixture state, as the piston 1 descends, it collides with the cylindrical wall 13 and diffuses and burns . The numbers added to the above configuration are for comparison with the drawings to facilitate understanding of the present invention, and the configuration of the present invention is not limited by this.
【０００９】[0009]
【作用】本発明においては、着火迄の混合気形成をでき
るだけ抑え、濃混合気の状態で燃焼させることにより、
予混合燃焼の抑制によるＮＯX の低減を図り、その後、
空気導入を増加させることにより、拡散燃焼の活発化に
よるスモークの低減を図る。In the present invention, formation of the air-fuel mixture until ignition is suppressed as much as possible, and combustion is performed in a rich air-fuel mixture state,
Aiming to reduce NO X by suppressing premixed combustion, then
By increasing the amount of air introduced, smoke is reduced due to activation of diffusion combustion.
【００１０】[0010]
【実施例】以下、本発明の実施例を図面を参照しつつ説
明する。図１は本発明の直接噴射式ディーゼル機関の燃
焼方法の１実施例を示し、図Ａは平面図、図Ｂは図Ａの
Ｘ−Ｘ線に沿って矢印方向に見た断面図である。Embodiments of the present invention will be described below with reference to the drawings. 1 shows an embodiment of a combustion method for a direct injection type diesel engine of the present invention, FIG. A is a plan view, and FIG. B is a sectional view taken along the line XX of FIG.
【００１１】１はピストン、２はピストンリング、３は
シリンダライナー、４はガスケット、５はシリンダヘッ
ド、６はノズル７を有する燃料噴射弁、９は燃焼室を示
し、ノズル７には、燃料を噴射する６つの噴孔が設けら
れているが、噴孔の数は限定されるものではない。ピス
トン１の頂部には、外周平坦部１ｂより突出するように
突出部１ａが形成され、この突出部１ａと外周平坦部１
ｂとの間に窪み部１ｃが形成される。Reference numeral 1 is a piston, 2 is a piston ring, 3 is a cylinder liner, 4 is a gasket, 5 is a cylinder head, 6 is a fuel injection valve having a nozzle 7, 9 is a combustion chamber, and the nozzle 7 is filled with fuel. Six injection holes are provided for injection, but the number of injection holes is not limited. A protrusion 1a is formed on the top of the piston 1 so as to protrude from the outer peripheral flat portion 1b. The protrusion 1a and the outer peripheral flat portion 1b are formed.
A recessed portion 1c is formed between it and b.
【００１２】そして、ピストン１の外周平坦部１ｂにボ
ルト１１により蓋体１２が固定される。蓋体１２の中央
部には筒状壁１３が形成され、蓋体１２の周囲には噴口
１５が形成される。この噴口１５は、ノズル７の噴孔か
らの燃料噴射方向にそれぞれ形成される。蓋体１２は、
噴口１５部の溶損を防ぐために、セラミックス、ステン
レス等の耐熱性材料で製造される。なお、材料を鋳鉄と
し蓋体１２をピストン１と一体に製造してもよいし、噴
口１５部に耐熱性材料を埋め込んだり、セラミックス溶
射等を施してもよい。A lid 12 is fixed to the outer peripheral flat portion 1b of the piston 1 with a bolt 11. A tubular wall 13 is formed in the center of the lid body 12, and a nozzle hole 15 is formed around the lid body 12. The injection holes 15 are respectively formed in the fuel injection direction from the injection holes of the nozzle 7. The lid 12 is
It is made of a heat-resistant material such as ceramics or stainless steel in order to prevent melting damage of the injection port 15. The material may be cast iron and the lid 12 may be manufactured integrally with the piston 1, or a heat resistant material may be embedded in the injection port 15 or ceramic spraying or the like may be performed.
【００１３】上記構成からなる本発明の作用について説
明する。前述したように、着火迄の混合気形成をできる
だけ抑え、濃混合気の状態で燃焼させることにより予混
合燃焼の抑制によるＮＯX の低減を図り、その後、空気
導入を増加させることにより拡散燃焼の活発化によるス
モークの低減を図ることが望ましい。本発明は以下の理
由によりこれを実現することができる。The operation of the present invention having the above structure will be described. As described above, Minimize the mixture formation until ignition, achieving a reduction of the NO X by suppressing the premixed combustion by combusting in a rich mixture condition, then the diffusion combustion by increasing the air introduction It is desirable to reduce smoke due to activation. The present invention can realize this for the following reasons.
【００１４】ピストン１の上死点直前あるいは上死点後
に噴射された燃料は、ノズル７から燃焼室９の窪み部１
ｃに衝突し、ピストン１の下降に伴い径の小さい筒状壁
１３に衝突する。噴射直後は燃焼室径が大きいために、
噴霧の壁面衝突による初期の空気導入が抑えられるた
め、濃混合気状態で燃焼し予混合燃焼割合が減少する結
果、ＮＯX の発生が抑制される。また、燃焼室９の底の
部分が噴霧に近い位置にあり、燃焼室９の上部は蓋体１
２で囲まれているため、噴霧への空気導入が抑えられ
る。従って、空気不足による濃混合気状態で、火炎は、
筒状壁１３および噴口１５からシリンダ内に吹き出し希
薄混合状態で燃焼する。ピストン１が下降するに伴い、
噴霧は筒状壁１３に衝突し、空気導入の増加および燃焼
室内スワールの増加により、拡散燃焼が活発となりスモ
ークが低減する。The fuel injected immediately before or after the top dead center of the piston 1 is injected from the nozzle 7 into the recess 1 of the combustion chamber 9.
When the piston 1 descends, it collides with the cylindrical wall 13 having a small diameter. Immediately after injection, the diameter of the combustion chamber is large,
Since the initial introduction of air due to the collision of the spray wall surface is suppressed, combustion is performed in a rich air-fuel mixture state and the premixed combustion ratio is reduced. As a result, the generation of NO X is suppressed. Further, the bottom portion of the combustion chamber 9 is near the spray, and the upper portion of the combustion chamber 9 is the lid 1.
Since it is surrounded by 2, the introduction of air into the spray is suppressed. Therefore, in a rich air-fuel mixture due to lack of air, the flame
It is blown into the cylinder from the cylindrical wall 13 and the injection port 15 and burns in a lean mixed state. As the piston 1 descends,
The mist collides with the cylindrical wall 13, and due to the increase of air introduction and the increase of swirl in the combustion chamber, diffusion combustion becomes active and smoke is reduced.
【００１５】なお、上記実施例の方式にパイロット噴射
と組み合わせ、燃焼室９側でパイロット噴射を行い、燃
焼室９の外側１６でメイン噴射を行うようにしてもよ
い。 The method of the above embodiment may be combined with pilot injection to perform pilot injection on the combustion chamber 9 side and perform main injection on the outside 16 of the combustion chamber 9.
【００１６】[0016]
【発明の効果】以上の説明から明らかなように本発明に
よれば、ノズルから噴射された燃料は、先ず、燃焼室径
の大きい燃焼室の窪み部に衝突するため、噴霧の壁面衝
突による初期の空気導入が抑えられ、濃混合気状態で燃
焼し予混合燃焼割合が減少する結果、ＮＯ X の発生が抑
制され、また、燃焼室の上部は蓋体で囲まれているた
め、噴霧への空気導入が抑えられ、従って、空気不足に
よる濃混合気状態で、火炎は、筒状壁および噴口からシ
リンダ内に吹き出し希薄混合状態で燃焼し、次いでピス
トンが下降するに伴い、噴霧は燃焼室径の小さい筒状壁
に衝突するため、空気導入の増加および燃焼室内スワー
ルの増加により、拡散燃焼が活発となりスモークが低減
される。 As is apparent from the above description, according to the present invention, the fuel injected from the nozzle is
Since it collides with the depression of the combustion chamber with a large
The initial air introduction due to collisions is suppressed, and the fuel is burned in a rich mixture state.
Baked premixed combustion ratio decreases result, generation of the NO X is suppressed
The upper part of the combustion chamber is surrounded by a lid.
Therefore, the introduction of air into the spray is suppressed, and therefore air is insufficient.
Due to the rich mixture, the flame is shielded from the cylindrical wall and the nozzle.
Blows into the Linda and burns in a lean mixture, then pis
As the ton goes down, the spray is a cylindrical wall with a small combustion chamber diameter.
Increase air introduction and swirl in the combustion chamber
The increase in fuel consumption increases the diffusion combustion and reduces smoke.
Is done.
【図１】本発明の直接噴射式ディーゼル機関の燃焼方法
の１実施例を示し、図Ａは平面図、図Ｂは図ＡのＸ−Ｘ
線に沿って矢印方向に見た断面図である。 FIG. 1 shows an embodiment of a combustion method for a direct injection type diesel engine of the present invention, FIG. A is a plan view and FIG. B is XX of FIG.
It is sectional drawing seen in the arrow direction along a line .
【図２】従来の直接噴射式ディーゼル機関の燃焼室の例
を示し、図Ａは断面図、図Ｂは平面図である。 FIG. 2 shows an example of a combustion chamber of a conventional direct injection diesel engine, FIG. A being a sectional view and FIG. B being a plan view .
１…ピストン、１ｃ…窪み部、３…シリンダ、５…シリ
ンダヘッド ６…燃料噴射弁、７…ノズル、９…燃焼室、１２…蓋
体、１３…筒状壁 １５…噴口 DESCRIPTION OF SYMBOLS 1 ... Piston, 1c ... Recessed part, 3 ... Cylinder, 5 ... Cylinder head 6 ... Fuel injection valve, 7 ... Nozzle, 9 ... Combustion chamber, 12 ... Lid body, 13 ... Cylindrical wall 15 ... Injection port
フロントページの続き (72)発明者 辻村欽司 茨城県つくば市苅間2530番地 財団法人 日本自動車研究所内 株式会社 新燃 焼システム研究所内 (56)参考文献 特開 平３−179127（ＪＰ，Ａ) 特開 昭63−162926（ＪＰ，Ａ) 実開 平３−97539（ＪＰ，Ｕ) 特公 昭30−3701（ＪＰ，Ｂ１)Front page continuation (72) Inventor Kinji Tsujimura 2530, Kuma, Tsukuba, Ibaraki Pref., Japan Automobile Research Institute, Inc. Shin Shinyaki System Research Co., Ltd. (56) Reference JP-A-3-179127 (JP, A) Sho 63-162926 (JP, A) Actual Kaihei 3-97539 (JP, U) Japanese Patent Sho 303701 (JP, B1)
Claims (1)
成された燃焼室と、シリンダヘッドに配設された燃料噴
射弁と、該燃料噴射弁のノズルに設けられた複数の噴孔
と、前記燃焼室の上部を覆うようにピストンに固定され
た蓋体と、該蓋体の中央部に形成された筒状壁と、前記
ノズルの噴孔からの燃料噴射方向に前記燃焼室の内外を
連通するように前記蓋体に形成された噴口とを備え、前
記噴孔からの燃料を前記窪み部に衝突させ濃混合気状態
で燃焼させた後、ピストンの下降に伴い前記筒状壁に衝
突させ拡散燃焼させることを特徴とする直接噴射式ディ
ーゼル機関の燃焼方法。1. A combustion chamber formed to have a depression at the top of a piston, a fuel injection valve provided in a cylinder head, and a plurality of injection holes provided in a nozzle of the fuel injection valve. A lid fixed to the piston so as to cover the upper part of the combustion chamber, a cylindrical wall formed in the central portion of the lid, and the inside and outside of the combustion chamber in the fuel injection direction from the injection hole of the nozzle. And a fuel injection port formed in the lid so as to communicate with each other, and fuel from the injection hole collides with the recessed portion to form a rich air-fuel mixture state.
In After combustion, the combustion method of the direct-injection diesel engine, characterized in Rukoto allowed to collide with the cylindrical wall with the downward movement of the piston to diffuse combustion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3272377A JP2675935B2 (en) | 1991-10-21 | 1991-10-21 | Direct injection diesel engine combustion method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3272377A JP2675935B2 (en) | 1991-10-21 | 1991-10-21 | Direct injection diesel engine combustion method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05106441A JPH05106441A (en) | 1993-04-27 |
| JP2675935B2 true JP2675935B2 (en) | 1997-11-12 |
Family
ID=17513044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3272377A Expired - Lifetime JP2675935B2 (en) | 1991-10-21 | 1991-10-21 | Direct injection diesel engine combustion method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2675935B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9506439B2 (en) | 2015-04-13 | 2016-11-29 | Caterpillar Inc. | Ducted combustion systems utilizing adjustable length ducts |
| US9803538B2 (en) | 2015-04-13 | 2017-10-31 | Caterpillar Inc. | Ducted combustion systems utilizing duct structures |
| US9587606B2 (en) | 2015-04-13 | 2017-03-07 | Caterpillar Inc. | Ducted combustion systems utilizing tubular ducts |
| JP7069776B2 (en) * | 2018-02-07 | 2022-05-18 | トヨタ自動車株式会社 | Internal combustion engine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63162926A (en) * | 1986-12-26 | 1988-07-06 | Isuzu Motors Ltd | Combustion chamber of internal combustion engine |
| JPH03179127A (en) * | 1989-12-07 | 1991-08-05 | Hino Motors Ltd | Direct combustion chamber structure for direct injection type diesel engine |
-
1991
- 1991-10-21 JP JP3272377A patent/JP2675935B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05106441A (en) | 1993-04-27 |
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