JP6032797B2 - Internal combustion engine - Google Patents
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本発明は、内燃機関に関する。特に、燃料を燃焼室に直接噴射供給する内燃機関の燃焼室の構造に関する。 The present invention relates to an internal combustion engine. In particular, the present invention relates to the structure of a combustion chamber of an internal combustion engine that directly injects fuel into the combustion chamber.
これまで、例えば、直接噴射式ディーゼルエンジン（燃料を直接燃焼室に噴射供給して燃焼させるディーゼルエンジン）において、所謂コモンレール式燃料噴射装置を備えたものでは、比較的自由に燃料噴射時期や燃料噴射量を可変制御可能であることから、例えば、各気筒に１本ずつ備えられた燃料噴射ノズルを用いて、燃料噴射の主噴射が開始するよりも前に、１〜３ｍｍ３／ｓｔ（ｓｔｒｏｋｅ）程度の微少量の燃料を極短時間のバルブの開閉で燃焼室に噴射供給（所謂プレ噴射）し、主噴射が開始するよりも前に、自己着火して燃料噴射ノズルからある程度離れた領域の局所温度を上げ、主噴射の着火遅れを、特に低負荷条件において短縮して、急激な予混合燃焼を抑制し、これにより急激な燃焼室内の圧力上昇を抑制することで、燃焼騒音を制御するなど、コモンレール式燃料噴射装置の特徴を活かした制御が行われてきた（所謂コモンレール式燃料噴射装置を備えたディーゼル機関の一例として、例えば、特許文献１などを参照）。 Up to now, for example, in a direct injection type diesel engine (a diesel engine in which fuel is directly injected into a combustion chamber and burned), a so-called common rail type fuel injection device is provided relatively freely. Since the amount can be variably controlled, for example, 1 to 3 mm 3 / st (stroke) before the main injection of fuel injection is started by using one fuel injection nozzle provided for each cylinder. A very small amount of fuel is injected and supplied to the combustion chamber (so-called pre-injection) by opening and closing the valve for a very short time, and before the main injection starts, it self-ignites to a certain extent away from the fuel injection nozzle. By increasing the local temperature and shortening the ignition delay of the main injection, especially under low load conditions, to suppress rapid premixed combustion, thereby suppressing the rapid pressure rise in the combustion chamber Including controlling combustion noise, control taking advantage of the common rail fuel injection system have been conducted (see as an example of a diesel engine equipped with a so-called common rail fuel injection system, for example, a Patent Document 1).
ここで、上述したようなプレ噴射では極微少量の燃料噴射量を噴射供給するが、その燃料噴射量は、最大燃料噴射量の１〜４％に過ぎないことから、その微少の燃料噴射量をライフサイクルに亘って長期に精度良く制御することは、非常に困難であるため、プレ噴射における燃料噴射量バラツキ等に起因する燃焼の悪化はある程度不可避な状況にあった。 Here, in the pre-injection as described above, a very small amount of fuel injection is injected and supplied, but since the fuel injection amount is only 1 to 4% of the maximum fuel injection amount, the small amount of fuel injection is reduced. Since it is very difficult to control accurately over a long period over the life cycle, the deterioration of combustion due to variations in the fuel injection amount in the pre-injection has been inevitable to some extent.
直接噴射式ディーゼルエンジンでは、着火遅れ期間の長さに応じて予混合燃焼割合が増加し、着火後の燃焼室内圧力の増大が急激となって燃焼騒音が大きくなるため、燃焼騒音を効果的に低減するには、燃料噴射の主噴射に先立ち微少量の燃料を燃焼室に噴射供給するプレ噴射が欠かせないのが実情である。 In a direct injection type diesel engine, the premixed combustion ratio increases with the length of the ignition delay period, and the increase in the pressure in the combustion chamber after ignition suddenly increases and the combustion noise increases. In order to reduce the fuel consumption, pre-injection in which a small amount of fuel is injected into the combustion chamber prior to the main injection of fuel injection is essential.
なお、プレ噴射の燃料噴射量を多くし過ぎると、主噴射での燃焼が悪化し排出ガスに含まれる有害成分が増大することに繋がるため、プレ噴射の燃料噴射量は、燃焼騒音の低減に有効な範囲において、少なければ少ないほど良いと言える。 Note that if the fuel injection amount of the pre-injection is excessively increased, combustion in the main injection deteriorates and harmful components contained in the exhaust gas increase, so the fuel injection amount of the pre-injection reduces the combustion noise. It can be said that the smaller the better, the better.
しかしながら、ディーゼルエンジンの高Ｐｍｅ（Ｍｅａｎ ｅｆｆｅｃｔｉｖｅ Ｐｒｅｓｓｕｒｅ）化に伴い、要求される最大燃料噴射量は増大され、微少燃料噴射量を精度良く制御することが難しいといった実情がある。 However, as the diesel engine has a high Pme (mean effective pressure), the required maximum fuel injection amount is increased, and it is difficult to control the minute fuel injection amount with high accuracy.
すなわち、高Ｐｍｅ化のための最大燃料噴射量の増大に伴う燃料噴射装置の大容量化により、プレ噴射の際における微少燃料噴射量をバラツキ少なく精度良く制御することは非常に難しいといった実情がある。 That is, there is a situation that it is very difficult to control the minute fuel injection amount with little variation and high accuracy in the pre-injection due to the increase in the capacity of the fuel injection device accompanying the increase in the maximum fuel injection amount for increasing the Pme. .
本発明は、かかる実情に鑑みなされたものであり、比較的簡単かつ低コストな構成でありながら、コモンレール式燃料噴射装置などの電子制御式燃料噴射装置を備えた直接噴射式内燃機関において、最大燃料噴射量を確保しながらプレ噴射を良好に実行することができ、以って燃焼悪化を抑制しながら、燃焼騒音を効果的に低減することができる内燃機関を提供することを目的とする。 The present invention has been made in view of such circumstances, and in a direct injection internal combustion engine having an electronically controlled fuel injection device such as a common rail fuel injection device, while having a relatively simple and low-cost configuration. It is an object of the present invention to provide an internal combustion engine that can perform pre-injection well while ensuring a fuel injection amount, and can effectively reduce combustion noise while suppressing deterioration of combustion.
このため、本発明に係る内燃機関は、
ピストン頂面と、シリンダヘッド下面と、ピストンが摺動自在に収容されるシリンダの内壁と、により囲まれた燃焼室を備え、燃料を燃焼室に直接噴射供給する内燃機関であって、
シリンダヘッドに取り付けられ、シリンダヘッド下面から燃焼室に臨んで設けられたコモンレール式主噴射用燃料噴射ノズルと、
主噴射用燃料噴射ノズルより外側でピストン燃焼室入口部内周壁の中央寄りに、シリンダヘッド下面から燃焼室に臨んで設けられたプレ噴射用燃料噴射ノズルと、
を備え、
プレ噴射用燃料噴射ノズルから噴射される燃料噴霧が、スワール旋回流により周方向に拡散されると共に、スキッシュ流によりピストン燃焼室中心寄りに拡散した後、自己着火することを特徴とする。
Therefore, the internal combustion engine according to the present invention is
An internal combustion engine comprising a combustion chamber surrounded by a piston top surface, a cylinder head lower surface, and an inner wall of a cylinder in which the piston is slidably accommodated, and directly injecting fuel into the combustion chamber,
A common rail fuel injection nozzle attached to the cylinder head and facing the combustion chamber from the bottom of the cylinder head;
A pre-injection fuel injection nozzle provided outside the main injection fuel injection nozzle and near the center of the inner peripheral wall of the piston combustion chamber inlet, facing the combustion chamber from the bottom surface of the cylinder head;
With
The fuel spray injected from the pre-injection fuel injection nozzle is diffused in the circumferential direction by the swirl swirl flow, and diffused toward the center of the piston combustion chamber by the squish flow, and then self-ignited.
本発明において、前記プレ噴射用燃料噴射ノズルへ燃料を供給する燃料供給ポンプが、前記主噴射用燃料噴射ノズルへ燃料を供給するコモンレール式の燃料供給装置とは別に備えられていることを特徴とすることができる。 In the present invention, a fuel supply pump that supplies fuel to the pre-injection fuel injection nozzle is provided separately from a common rail fuel supply device that supplies fuel to the main injection fuel injection nozzle. can do.
本発明によれば、比較的簡単かつ低コストな構成でありながら、コモンレール式燃料噴射装置などの電子制御式燃料噴射装置を備えた直接噴射式内燃機関において、最大燃料噴射量を確保しながらプレ噴射を良好に実行することができ、以って燃焼悪化を抑制しながら、燃焼騒音を効果的に低減することができる内燃機関を提供することができる。 According to the present invention, in a direct injection internal combustion engine equipped with an electronically controlled fuel injection device such as a common rail fuel injection device, the pre-production is performed while ensuring the maximum fuel injection amount, while having a relatively simple and low-cost configuration. It is possible to provide an internal combustion engine that can perform injection well and can effectively reduce combustion noise while suppressing deterioration of combustion.
以下、本発明に係る一実施の形態を、添付の図面を参照しつつ説明する。なお、以下で説明する実施の形態により、本発明が限定されるものではない。 DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the accompanying drawings. The present invention is not limited to the embodiments described below.
本発明の一実施の形態に係る直接噴射式ディーゼル機関である内燃機関１００は、図１、図２に示すように、シリンダヘッド１１０の下面と、ピストン１２０の頂面（上面）と、シリンダブロック（図示せず）に嵌挿されるシリンダライナ内周壁面（図示せず）と、により画成される燃焼室１５０に、燃料噴射ノズル１６０の先端が臨むように、シリンダヘッド１１０に取り付けられている。 As shown in FIGS. 1 and 2, an internal combustion engine 100 that is a direct injection diesel engine according to an embodiment of the present invention includes a lower surface of a cylinder head 110, a top surface (upper surface) of a piston 120, and a cylinder block. A cylinder liner is attached to the cylinder head 110 such that the tip of the fuel injection nozzle 160 faces a combustion chamber 150 defined by an inner peripheral wall surface (not shown) inserted into a cylinder liner (not shown). .
この燃料噴射ノズル１６０は、所謂コモンレール式（蓄圧式）燃料噴射装置に接続されて燃料噴射量、燃料噴射開始時期、燃料噴射期間、燃料噴射率などを任意に制御可能に構成されている。
また、当該燃料噴射ノズル１６０は、気筒（シリンダ、燃焼室）毎にシリンダヘッド１１０に設けられ、図２に示すように、その先端が、ピストン１２０の往復運動方向から見たときに燃焼室１５０の略中心となるように配設される。
The fuel injection nozzle 160 is connected to a so-called common rail type (accumulation type) fuel injection device, and is configured to arbitrarily control the fuel injection amount, the fuel injection start timing, the fuel injection period, the fuel injection rate, and the like.
The fuel injection nozzle 160 is provided in the cylinder head 110 for each cylinder (cylinder, combustion chamber). As shown in FIG. 2, the tip of the fuel injection nozzle 160 is viewed from the reciprocating motion direction of the piston 120. It is arrange | positioned so that it may become a substantially center.
燃焼室１５０に臨む燃料噴射ノズル１６０の先端には、例えば５〜１０個程度の複数の噴孔が周方向に所定間隔で設けられていて、該複数の噴孔からやや下向きに（円錐角（コーン角）として例えば１４０〜１６０度程度）ピストン１２０の頂面に凹状に設けられたピストン燃焼室（キャビティ）１２１へ向けて、内燃機関１００の運転状態（回転速度や負荷等）に応じて設定された燃料噴射量にて、所定タイミングで燃料が噴射供給されるようになっている。
なお、この燃料噴射ノズル１６０は、主噴射を行うためのインジェクタである。
At the tip of the fuel injection nozzle 160 facing the combustion chamber 150, for example, about 5 to 10 nozzle holes are provided at predetermined intervals in the circumferential direction, and slightly downward (conical angle ( (Cone angle) is set to, for example, about 140 to 160 degrees) toward the piston combustion chamber (cavity) 121 provided in a concave shape on the top surface of the piston 120 according to the operating state (rotational speed, load, etc.) of the internal combustion engine 100 The fuel is injected and supplied at a predetermined timing with the injected fuel amount.
The fuel injection nozzle 160 is an injector for performing main injection.
ここにおいて、本実施の形態に係る内燃機関１００には、上記の燃料噴射ノズル１６０の他に、直接噴射式（燃焼室内に直接燃料を噴射供給する燃料供給方式）のガソリン機関（直噴ガソリン機関）等に用いられているインジェクタ（燃料噴射ノズル）２００が、各気筒毎に、図１、図２に示すように、その先端が、燃焼室１５０に臨むように、シリンダヘッド１１０に取り付けられている。 Here, in the internal combustion engine 100 according to the present embodiment, in addition to the fuel injection nozzle 160, a gasoline engine (direct injection gasoline engine) of a direct injection type (a fuel supply system that directly injects and supplies fuel into the combustion chamber). The injector (fuel injection nozzle) 200 used in the cylinder head 110 is attached to the cylinder head 110 for each cylinder so that the tip thereof faces the combustion chamber 150 as shown in FIGS. Yes.
このインジェクタ２００は、プレ噴射を行うためのプレ噴射用燃料噴射ノズルで、直噴ガソリンエンジン用インジェクタとして一般的な燃料圧力が１０ＭＰａレベルのものを用いることができる。 The injector 200 is a pre-injection fuel injection nozzle for performing pre-injection, and an injector having a general fuel pressure level of 10 MPa as an injector for a direct injection gasoline engine can be used.
なお、インジェクタ２００へ燃料を供給する燃料供給ポンプとしては、主噴射用燃料噴射ノズル１６０に燃料を供給するコモンレール式燃料供給装置と共用とすることができるが、この主噴射用燃料噴射ノズル１６０に燃料を供給するコモンレール式燃料供給装置とは別に（別個独立して）、直噴ガソリンエンジン用の燃料供給ポンプを備えて構成することができる。 The fuel supply pump that supplies fuel to the injector 200 can be shared with a common rail fuel supply device that supplies fuel to the main injection fuel injection nozzle 160. A fuel supply pump for a direct-injection gasoline engine can be provided separately from (independently from) the common rail fuel supply device that supplies fuel.
インジェクタ２００からの燃料の噴射方向は、図２に示すように、ピストン燃焼室１２１の入口部内周壁から僅かに燃焼室中心に寄った方向とされ、インジェクタ２００の先端が配置されているスワール旋回流Ｘ、スキッシュ流Ｙとも非常に強い領域から、スワール旋回流Ｘに沿ってスワール旋回流下流方向のみに向けて燃料を噴射するようになっている。 As shown in FIG. 2, the direction of fuel injection from the injector 200 is a direction slightly approaching the center of the combustion chamber from the inner peripheral wall of the inlet of the piston combustion chamber 121, and a swirl swirl flow in which the tip of the injector 200 is disposed Fuel is injected along the swirl swirl flow X only in the downstream direction of the swirl swirl flow from a region where both X and squish flow Y are very strong.
インジェクタ２００からの燃料の噴射時期は、ピストン上死点（ＴＤＣ）に近すぎると、高い筒内圧（シンリンダ内圧、燃焼室内圧）によって燃料噴霧の周方向への拡散が阻害されるおそれがあると共に、燃料噴霧の拡散に利用したいスキッシュ流Ｙも弱まってしまうため、図３、図４に例示するように、ある程度早期（２０〜３０°ＣＡ ＢＴＤＣ）（上死点前クランクアングル２０〜３０°）に噴射するように設定されている。 If the injection timing of the fuel from the injector 200 is too close to the piston top dead center (TDC), the high in-cylinder pressure (cylinder internal pressure, combustion chamber pressure) may hinder the diffusion of fuel spray in the circumferential direction. Since the squish flow Y that is desired to be used for the diffusion of the fuel spray is also weakened, as illustrated in FIGS. 3 and 4, it is somewhat early (20 to 30 ° CA BTDC) (crank angle 20 to 30 ° before top dead center). It is set to inject.
インジェクタ２００からは、プレ噴射のための微少量の燃料しか噴射しないため、直噴ガソリン機関等で用いられている小容量のインジェクタ２００を採用すると共に、燃料噴霧が微粒化するようにノズル噴孔を小さく絞った構成とする。 Since only a small amount of fuel for pre-injection is injected from the injector 200, a small-capacity injector 200 used in a direct-injection gasoline engine or the like is adopted, and a nozzle injection hole is used so that fuel spray is atomized. It is set as the structure which narrowed down small.
ノズル噴孔を小さく絞ることで、同一燃料量の場合、燃料噴射期間が長くなるが、上述したように、上死点前２０〜３０°（クランクアングル）での早期噴射を行うため、燃料噴射中に自己着火することはない。 By narrowing down the nozzle nozzle hole, the fuel injection period becomes longer for the same fuel amount. However, as described above, fuel injection is performed in order to perform early injection at 20 to 30 ° (crank angle) before top dead center. There is no self-ignition inside.
このインジェクタ２００の燃料噴射開始から噴射した燃料が自己着火するまでの着火遅れ期間中に、インジェクタ２００から噴射された燃料噴霧は、図２に示したように、ピストン燃焼室１２１の入口部で増速されたスワール旋回流Ｘにより周方向に拡散すると共に、スキッシュ流Ｙによりピストン燃焼室１２１のやや中心寄りに拡散した後、自己着火することで、これまでのプレ噴射（燃料噴射の主噴射が開始するよりも前に、微少量の燃料を燃焼室に噴射供給すること）と同等の効果が期待できる。 During the ignition delay period from the start of fuel injection of the injector 200 until the injected fuel self-ignites, the fuel spray injected from the injector 200 increases at the inlet of the piston combustion chamber 121 as shown in FIG. After being diffused in the circumferential direction by the swirled swirl flow X that has been accelerated and diffused slightly toward the center of the piston combustion chamber 121 by the squish flow Y, self-ignition is performed, so that the pre-injection (main injection of the fuel injection) An effect equivalent to that of injecting and supplying a small amount of fuel to the combustion chamber before starting can be expected.
本実施の形態においては、プレ噴射専用のインジェクタ２００からの燃料噴霧を、スワール旋回流Ｘにより周方向に拡散することが重要となるので、スワール旋回流Ｘが発生するように吸気ポートの形状が形成或いは調整されていることが前提とされる。従って、本実施の形態に係る内燃機関１００としては、スワール比として、１．５〜２．０程度の吸気スワールが発生可能な内燃機関が前提となる。 In the present embodiment, since it is important to diffuse the fuel spray from the injector 200 dedicated for pre-injection in the circumferential direction by the swirl swirl flow X, the shape of the intake port is such that the swirl swirl flow X is generated. It is assumed that it is formed or adjusted. Therefore, the internal combustion engine 100 according to the present embodiment is premised on an internal combustion engine capable of generating an intake swirl with a swirl ratio of about 1.5 to 2.0.
なお、プレ噴射専用のインジェクタ２００は、プレ噴射のための微少量の燃料しか噴射しなくて良いため、小容量のインジェクタを採用することができるので、プレ噴射のための微少量の燃料燃噴射量制御を長期に亘って高精度に維持することができる。 Note that the injector 200 dedicated to pre-injection only needs to inject a small amount of fuel for pre-injection, and thus a small-capacity injector can be adopted, so that a small amount of fuel-fuel injection for pre-injection can be adopted. Quantity control can be maintained with high accuracy over a long period of time.
また、主噴射専用のインジェクタである燃料噴射ノズル１６０は、プレ噴射を行わないため、コモンレール（蓄圧室）内の圧力変動（燃圧変動）が抑制されため、主噴射の開始初期から高い実効噴射圧力を得ることができ、燃料噴射期間の短縮や燃料噴霧の微粒化促進に貢献することができる。 In addition, since the fuel injection nozzle 160, which is an injector dedicated to main injection, does not perform pre-injection, pressure fluctuation (fuel pressure fluctuation) in the common rail (accumulation chamber) is suppressed, so that a high effective injection pressure from the beginning of main injection starts. And can contribute to shortening the fuel injection period and promoting atomization of the fuel spray.
また、主噴射専用の燃料噴射ノズル１６０は、プレ噴射を行わないため、コモンレール（蓄圧室）内の圧力脈動が抑制される。従って、燃料噴射ノズル１６０の噴射量バラツキ（噴射毎のバラツキ、気筒間でのバラツキ）を抑制することができるため、燃焼変動の改善や黒煙（スス）の排出濃度の改善を図ることにも貢献することができる。 Moreover, since the fuel injection nozzle 160 dedicated to main injection does not perform pre-injection, pressure pulsation in the common rail (pressure accumulation chamber) is suppressed. Accordingly, variation in the injection amount of the fuel injection nozzle 160 (variation at each injection, variation among cylinders) can be suppressed, so that it is possible to improve combustion fluctuations and black smoke (soot) emission concentration. Can contribute.
更に、主噴射専用の燃料噴射ノズル１６０は、プレ噴射を行わなくて良いため、増大する負荷（最大燃料噴射量）と、それに伴う燃料噴射圧力の高圧化に対応したノズル諸元を選定して実現することができるため、設計の自由度を大幅に改善することができる。 Furthermore, since the fuel injection nozzle 160 dedicated to main injection need not perform pre-injection, select the nozzle specifications corresponding to the increasing load (maximum fuel injection amount) and the accompanying increase in fuel injection pressure. Since this can be realized, the degree of freedom in design can be greatly improved.
このように、本実施の形態によれば、比較的簡単かつ低コストな構成でありながら、コモンレール式燃料噴射装置などの電子制御式燃料噴射装置を備えた直接噴射式内燃機関において、最大燃料噴射量を確保しながらプレ噴射を良好に実行することができ、以って燃焼悪化を抑制しながら、燃焼騒音を効果的に低減することができる内燃機関を提供することができる。 As described above, according to the present embodiment, in a direct injection internal combustion engine having an electronically controlled fuel injection device such as a common rail fuel injection device, the maximum fuel injection is achieved with a relatively simple and low-cost configuration. It is possible to provide an internal combustion engine that can perform pre-injection well while ensuring the amount, and can effectively reduce combustion noise while suppressing deterioration of combustion.
なお、本実施の形態では、プレ噴射専用のインジェクタ２００を単噴孔として図示して説明したが、これに限定されるものはなく、複数の噴孔を備えて構成することもできる。 In the present embodiment, the injector 200 dedicated to pre-injection is illustrated and described as a single injection hole, but the present invention is not limited to this and may be configured with a plurality of injection holes.
本実施の形態では、ディーゼルエンジンを例として説明したが、本発明はこれに限定されるものではなく、ガソリン、天然ガス、アルコール、バイオ燃料など軽油以外の燃料であっても、直接的に燃焼室に燃料を噴射供給する内燃機関であれば、本発明は適用可能であり、本発明の技術的範囲に含まれるものである。 In the present embodiment, the diesel engine has been described as an example. However, the present invention is not limited to this, and even a fuel other than light oil such as gasoline, natural gas, alcohol, biofuel, or the like is directly combusted. The present invention can be applied to any internal combustion engine that injects fuel into the chamber and is included in the technical scope of the present invention.
本発明は、上述した発明の実施の形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において、種々変更を加え得ることは可能である。 The present invention is not limited to the embodiments of the invention described above, and various modifications can be made without departing from the gist of the present invention.
１００ 内燃機関（エンジン）
１１０ シリンダヘッド
１２０ ピストン
１２１ ピストン燃焼室（キャビティ）
１５０ 燃焼室
１６０ 燃料噴射ノズル（主噴射用）
２００ インジェクタ（プレ噴射用燃料噴射ノズル）
100 Internal combustion engine
110 Cylinder head 120 Piston 121 Piston combustion chamber (cavity)
150 Combustion chamber 160 Fuel injection nozzle (for main injection)
200 injector (fuel injection nozzle for pre-injection)
Claims (2)
シリンダヘッドに取り付けられ、シリンダヘッド下面から燃焼室に臨んで設けられたコモンレール式主噴射用燃料噴射ノズルと、
主噴射用燃料噴射ノズルより外側でピストン燃焼室入口部内周壁の中央寄りに、シリンダヘッド下面から燃焼室に臨んで設けられたプレ噴射用燃料噴射ノズルと、
を備え、
プレ噴射用燃料噴射ノズルから噴射される燃料噴霧が、スワール旋回流により周方向に拡散されると共に、スキッシュ流によりピストン燃焼室中心寄りに拡散した後、自己着火することを特徴とする内燃機関。 An internal combustion engine comprising a combustion chamber surrounded by a piston top surface, a cylinder head lower surface, and an inner wall of a cylinder in which the piston is slidably accommodated, and directly injecting fuel into the combustion chamber,
A common rail fuel injection nozzle attached to the cylinder head and facing the combustion chamber from the bottom of the cylinder head;
A pre-injection fuel injection nozzle provided outside the main injection fuel injection nozzle and near the center of the inner peripheral wall of the piston combustion chamber inlet, facing the combustion chamber from the bottom surface of the cylinder head;
With
An internal combustion engine characterized in that fuel spray injected from a pre-injection fuel injection nozzle is diffused in the circumferential direction by a swirl swirl flow and diffused toward the center of a piston combustion chamber by a squish flow and then self-ignited.
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