JP2005139987A - Direct injection internal combustion engine and multi-hole type fuel injection valve - Google Patents

Direct injection internal combustion engine and multi-hole type fuel injection valve Download PDF

Info

Publication number
JP2005139987A
JP2005139987A JP2003376574A JP2003376574A JP2005139987A JP 2005139987 A JP2005139987 A JP 2005139987A JP 2003376574 A JP2003376574 A JP 2003376574A JP 2003376574 A JP2003376574 A JP 2003376574A JP 2005139987 A JP2005139987 A JP 2005139987A
Authority
JP
Japan
Prior art keywords
injection
fuel
nozzle hole
fuel spray
plate
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.)
Pending
Application number
JP2003376574A
Other languages
Japanese (ja)
Inventor
Eiji Takahashi
英二 高橋
Isamu Hotta
勇 堀田
Koji Hiratani
康治 平谷
Akihiko Kakuho
章彦 角方
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP2003376574A priority Critical patent/JP2005139987A/en
Publication of JP2005139987A publication Critical patent/JP2005139987A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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

  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To perform good stratified combustion by forming suitable stratified air fuel mixture in a combustion chamber of a direct injection internal combustion engine. <P>SOLUTION: Injection holes 23a not delaying injection of fuel spray opened roughly perpendicularly to an inner surface of a plate 22 and injection holes 23b delaying injection of fuel spray opened inclinedly to the inner surface of the plate 22 (in a tip side of the injection holes 23b) with angles larger than 90 degrees are provided on the plate 22 forming a nozzle of a fuel injection valve. Distance from the injection holes 23a not delaying injection to an inner surface of a cavity 14 which fuel spray reach is made longer than distance from the injection holes 23b delaying injection to the inner surface of the cavity 14 which fuel spray reach. Stratified air fuel mixture having equal concentration in a circumference direction is formed by making fuel spray from each injection hole 23a, 23b reach the inner surface of the cavity at approximately the same time. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、燃焼室内に直接燃料を噴射する直噴式内燃機関及び該直噴式内燃機関に用いられる多孔式燃料噴射弁に関し、特に、成層混合気の形成を良好に行うための技術に関する。   The present invention relates to a direct-injection internal combustion engine that directly injects fuel into a combustion chamber and a porous fuel injection valve used in the direct-injection internal combustion engine, and more particularly to a technique for satisfactorily forming a stratified mixture.

燃焼室略中央部に点火プラグと燃料噴射弁を備えると共に、ピストン冠面の中央部に形成したキャビティを形成し、運転状態に応じて燃料噴射タイミングを変更することによって均一状態の混合気を形成しての均質燃焼と成層状態の混合気を形成しての成層燃焼とを切り換えられるようにしたものがある（特許文献１参照）。
特開２０００−２６５８４１号公報 An ignition plug and a fuel injection valve are provided in the approximate center of the combustion chamber, and a cavity formed in the center of the piston crown is formed. By changing the fuel injection timing according to the operating conditions, a uniform mixture is formed. There is one that can switch between homogeneous combustion and stratified combustion by forming a stratified mixture (see Patent Document 1).
JP 2000-265841 A

しかしながら、上記直噴式内燃機関では、燃料噴射弁がピストン中心軸に対して傾斜して装着されているため、燃料噴霧のキャビティ到達時期が周方向で同一とならず、その結果、成層混合気内部に空燃比の偏りが生じて、成層燃焼の燃焼性を低下させていた。
本発明はかかる問題点に鑑みてなされたもので、内部での空燃比の偏りが少ない成層混合気を燃焼室内に形成して成層燃焼の燃焼性を高めることを目的とする。 However, in the direct injection internal combustion engine, since the fuel injection valve is mounted inclined with respect to the piston central axis, the arrival time of the fuel spray in the cavity is not the same in the circumferential direction. As a result, the air-fuel ratio was uneven, and the flammability of stratified combustion was reduced.
The present invention has been made in view of such problems, and an object of the present invention is to form a stratified air-fuel mixture with little bias in the air-fuel ratio inside the combustion chamber to enhance the flammability of stratified combustion.

このため本発明に係る直噴式内燃機関は、燃焼室上部の略中心にシリンダ中心軸に対して噴霧中心軸を傾斜させて多孔式燃料噴射弁を装着し、ピストン冠面に前記燃料噴射弁からの燃料噴霧を受けるキャビティを設けた直噴式内燃機関であって、燃料噴射弁の各噴孔の中心軸に沿ったキャビティ壁面までの距離が近い側の噴孔ほど燃料噴霧を遅延して噴射するように構成した。   For this reason, the direct injection internal combustion engine according to the present invention is mounted with a porous fuel injection valve at a substantially center of the upper portion of the combustion chamber with the spray central axis inclined with respect to the cylinder central axis, and the piston crown surface from the fuel injection valve. Direct injection type internal combustion engine provided with a cavity for receiving the fuel spray of the fuel injection valve, the fuel spray is delayed and injected toward the side closer to the cavity wall surface along the central axis of each nozzle hole of the fuel injection valve It was configured as follows.

また、本発明に係る多孔式燃料噴射弁は、燃焼室上部の略中心にシリンダ中心軸に対して噴霧中心軸を傾斜させて装着され、ピストン冠面に形成されたキャビティに燃料噴霧が受け止められるように燃料噴射する多孔式燃料噴射弁であって、各噴孔の中心軸に沿ったキャビティ壁面までの距離が近い側の噴孔ほど燃料噴霧を遅延して噴射するように各噴孔を形成した構成とした。   The porous fuel injection valve according to the present invention is mounted at an approximate center of the upper portion of the combustion chamber with the spray central axis inclined with respect to the cylinder central axis, and fuel spray is received in a cavity formed in the piston crown surface. In this way, each nozzle hole is formed so that the fuel spray is delayed and injected toward the side closer to the cavity wall along the central axis of each nozzle hole. The configuration was as follows.

本発明に係る直噴式内燃機関ないし多孔式燃料噴射弁によれば、燃料噴射弁の各噴孔の中心軸に沿ったピストンキャビティまでの距離が短いほど燃料噴霧を遅延して噴射することで、ピストンキャビティに受け止められた燃料噴霧がシリンダヘッド側に巻き上がる時期がピストンキャビティの週方向においてほぼ同一となるため、燃焼室の周方向に空燃比の偏りが少ない成層混合気を形成することが可能となり、良好な成層燃焼を得られる。   According to the direct injection internal combustion engine or the porous fuel injection valve according to the present invention, the fuel spray is delayed and injected as the distance to the piston cavity along the central axis of each injection hole of the fuel injection valve is shorter. Since the fuel spray received in the piston cavity rolls up to the cylinder head side is almost the same in the week direction of the piston cavity, it is possible to form a stratified mixture with little air-fuel ratio deviation in the circumferential direction of the combustion chamber Thus, good stratified combustion can be obtained.

図１に本発明の第１実施形態に係る直噴式内燃機関の構成を示す。
シリンダヘッド２と、シリンダブロック３と、ピストン４とによって燃焼室１が形成され、吸気弁７を介して吸気ポート５と、排気弁８を介して排気ポート６とそれぞれ連通している。吸気弁７と排気弁８は、それぞれ吸気弁用カム９と、排気弁用カム１０とによって開閉駆動される。 FIG. 1 shows the configuration of a direct injection internal combustion engine according to the first embodiment of the present invention.
Combustion chamber 1 is formed by cylinder head 2, cylinder block 3, and piston 4, and communicates with intake port 5 via intake valve 7 and exhaust port 6 via exhaust valve 8. The intake valve 7 and the exhaust valve 8 are driven to open and close by an intake valve cam 9 and an exhaust valve cam 10, respectively.

燃焼室１の上面（シリンダヘッド）の略中央付近にシリンダ中心軸に対して噴霧がエンジン後方へ傾くよう傾斜させた多孔式燃料噴射弁１１が設けられ、燃焼室１上部のインジェクタより後方に点火プラグ１２が配置されている。ピストン４の冠面には略中央付近に、略円筒状のキャビティ１４が設けられている。なお、この内燃機関はエンジンコントロールユニット１３からの信号に基づいて、燃料噴射および点火が行われる。   Near the center of the upper surface (cylinder head) of the combustion chamber 1 is provided a porous fuel injection valve 11 that is inclined so that the spray is inclined toward the rear of the engine with respect to the center axis of the cylinder. A plug 12 is arranged. A substantially cylindrical cavity 14 is provided near the center of the crown of the piston 4. The internal combustion engine performs fuel injection and ignition based on a signal from the engine control unit 13.

図２は同上実施形態に用いられる燃料噴射弁１１の要部（先端部）の構成を示し、針弁２１が、プレート２２で形成されたノズルの内面（シート面）に着座して閉弁するようになっている。前記プレート２２は、燃料噴霧の噴射を遅延しない噴孔２３ａと、遅延する噴孔２３ｂとが開口されてノズルを構成している。ここで、前記遅延しない噴孔２３ａはプレート２２の内面に対して略垂直に開けられている一方、前記遅延する噴孔２３ｂはプレート２２の内面（噴孔２３ｂより先端側）に対して９０度より大きな角度を持ってく傾斜して開けられている。すなわち、燃料噴霧の噴射を遅延する噴孔２３ｂの中心線と、プレート２２内面の垂線とのなす角を、噴射を遅延させない噴孔２３ａの中心線と、前記プレート２２内面の垂線とのなす角よりも大きくなるように形成されている。   FIG. 2 shows the configuration of the main part (tip end part) of the fuel injection valve 11 used in the above embodiment, and the needle valve 21 sits on the inner surface (seat surface) of the nozzle formed by the plate 22 and closes the valve. It is like that. The plate 22 constitutes a nozzle by opening an injection hole 23a that does not delay the injection of fuel spray and an injection hole 23b that delays the injection. Here, the non-delayed nozzle hole 23a is opened substantially perpendicular to the inner surface of the plate 22, while the delayed nozzle hole 23b is 90 degrees with respect to the inner surface of the plate 22 (the tip side from the nozzle hole 23b). It is opened at an angle with a larger angle. That is, the angle formed by the center line of the injection hole 23b that delays the injection of the fuel spray and the perpendicular line of the inner surface of the plate 22 is formed by the center line of the injection hole 23a that does not delay the injection and the perpendicular line of the inner surface of the plate 22 It is formed so as to be larger.

このように形成することで、針弁２１のリフト初期において、燃料が噴孔に流入する際の流速方向の変化が、プレート２２内面に対して傾斜して開けられた噴孔２３ｂの方が、プレート２２の内面に対して略垂直に開けられた噴孔２３ａより大きくなり、流速の立ち上がりが遅れるため、燃料噴霧が遅延して噴射される。
そして、前記燃料噴霧の噴射を遅延しない噴孔２３ａは、該噴孔２３ａからの燃料噴霧がキャビティ１４内面に到達するまでの距離が、前記噴射を遅延する噴孔２３ｂからの燃料噴霧がキャビティ１４内面に到達するまでの距離より長くなるようにして燃料噴射弁１１を装着する。なお、図では、簡明のため燃料噴霧の噴射を遅延しない噴孔２３ａと遅延する噴孔２３ｂとの２個のみを示してあるが、実際には３個以上の噴孔２３を設け、燃料噴霧がキャビティ１４内面に到達するまでの距離が最も長い噴孔２３を、遅延しない噴孔としてプレート２２の内面に対して略垂直に開け、該距離が短くなる噴孔２３ほどプレート２２の内面に対する傾斜量を大きくして開けることにより遅延量を大きくした噴孔２３とする。 By forming in this way, at the initial stage of lift of the needle valve 21, the change in the flow velocity direction when the fuel flows into the injection hole is more inclined in the injection hole 23b opened to the inner surface of the plate 22. Since it becomes larger than the injection hole 23a opened substantially perpendicularly to the inner surface of the plate 22 and the rise of the flow velocity is delayed, fuel spray is injected with a delay.
The nozzle hole 23a that does not delay the injection of the fuel spray has a distance until the fuel spray from the nozzle hole 23a reaches the inner surface of the cavity 14, and the fuel spray from the nozzle hole 23b that delays the injection is the cavity 14. The fuel injection valve 11 is mounted so as to be longer than the distance to reach the inner surface. In the figure, for the sake of simplicity, only two injection holes 23a and 23b, which do not delay the injection of fuel spray, are shown. However, in actuality, three or more injection holes 23 are provided and the fuel spray is provided. The nozzle hole 23 having the longest distance to reach the inner surface of the cavity 14 is opened substantially perpendicularly to the inner surface of the plate 22 as a non-delayed nozzle hole, and the nozzle hole 23 with the shorter distance is inclined with respect to the inner surface of the plate 22. The nozzle hole 23 having a larger delay amount is formed by opening a larger amount.

以下、本実施形態の成層燃焼モードにおける成層混合気形成の概略を、図３を参照しつつ説明する。燃料噴射開始時期は、燃料噴霧がピストン４のキャビティ１４に受け止められるよう設定される。
燃料噴霧がキャビティ１４に到達するまでの距離が長い位置にある噴孔から先に燃料が噴射され｛同図（Ａ）参照｝、続いて徐々に距離が短い位置にある噴孔からも噴射が開始される｛同図（Ｂ）参照｝。 Hereinafter, an outline of stratified mixture formation in the stratified combustion mode of the present embodiment will be described with reference to FIG. The fuel injection start time is set so that the fuel spray is received by the cavity 14 of the piston 4.
The fuel is injected first from the nozzle hole at a position where the distance until the fuel spray reaches the cavity 14 is long {see FIG. (A)}, and then injected from the nozzle hole at a position where the distance is gradually shorter. The process is started {see (B) in the figure}.

時間の経過と共に燃料噴霧の進行とピストン４の上昇が進み、燃料噴霧の先端はキャビティ１４に衝突するが、キャビティ１４に到達するまでの距離が短い位置にある噴孔ほど燃料噴霧の噴射開始が遅延されているため、どの噴孔から噴射された噴霧でもほぼ同時に衝突する｛同図（Ｃ）参照｝。
衝突後の燃料噴霧は、周方向でほぼ同時にキャビティ１４外周壁面で巻き上げられ、周囲の空気を巻き込みながらキャビティ上空に成層混合気を形成する｛同図（Ｄ），（Ｅ）参照｝。 As the fuel spray progresses and the piston 4 rises as time passes, the tip of the fuel spray collides with the cavity 14, but the injection hole of the fuel spray starts at a position where the distance until reaching the cavity 14 is short. Due to the delay, the sprays injected from any nozzle holes collide almost simultaneously {see (C) in the figure}.
The fuel spray after the collision is wound up on the outer peripheral wall surface of the cavity 14 almost simultaneously in the circumferential direction, and forms a stratified mixture over the cavity while enclosing the surrounding air {see FIGS. (D) and (E)}.

こうして形成された成層混合気はシリンダ円周方向への偏りが少なく、したがって良好な燃焼性能を得ることが可能となる。
次に、第２実施形態について説明する。第１実施形態との違いは燃料噴射弁の構成だけなので、燃料噴射弁の構成についてのみ説明する。
図４に第２実施形態にかかる燃料噴射弁の構成を示す。針弁１１と、ノズルを形成するプレート３１と、プレート３１に開けられた燃料噴霧の噴射を遅延しない噴孔３２ａと、遅延する噴孔３２ｂとで構成されている。プレート３１の内面は曲面で構成されており、したがって、プレート３１内面の垂線は、連続的に変化している。本実施形態では、燃料噴霧の噴射を遅延しない噴孔３２ａと遅延する噴孔３２ｂは燃料噴射弁１１の中心軸に対して同一の傾きを持っているが、噴孔３２を開ける位置を変えることでプレート３１内面に対する角度を、遅延する噴孔３２ｂの方が大きくすることができる。このように、ノズルの先端の内面を曲面で構成することで、プレート３１内面の垂線方向がノズル内の位置によって変化するため、噴孔３２を開ける位置を任意にとることで、噴孔３２自体の角度を変えることなく噴孔３２の中心線と噴孔３２を開けるプレート内面の垂線のなす角を変えることにより、所望の噴霧角度を保ちつつ第１実施形態の効果を得ることが可能となる。また、同一の工具ないし同一の加工設定で、第１実施形態と同様の機能をもつ燃料噴霧の噴射を遅延しない噴孔３２ａと遅延する噴孔３２ｂを形成することができ、加工効率を向上できる。 The stratified air / fuel mixture thus formed is less biased in the cylinder circumferential direction, and therefore good combustion performance can be obtained.
Next, a second embodiment will be described. Since the difference from the first embodiment is only the configuration of the fuel injection valve, only the configuration of the fuel injection valve will be described.
FIG. 4 shows the configuration of the fuel injection valve according to the second embodiment. The needle valve 11, the plate 31 that forms the nozzle, the injection hole 32 a that does not delay the injection of the fuel spray that is opened in the plate 31, and the injection hole 32 b that is delayed. The inner surface of the plate 31 is formed of a curved surface, and therefore the perpendicular line on the inner surface of the plate 31 changes continuously. In the present embodiment, the injection hole 32a that does not delay the injection of fuel spray and the injection hole 32b that delays have the same inclination with respect to the central axis of the fuel injection valve 11, but the position at which the injection hole 32 is opened is changed. Thus, the angle of the delayed injection hole 32b can be increased with respect to the inner surface of the plate 31. Since the inner surface at the tip of the nozzle is configured as a curved surface in this way, the perpendicular direction of the inner surface of the plate 31 changes depending on the position in the nozzle. Therefore, the nozzle hole 32 itself can be formed by arbitrarily setting the position where the nozzle hole 32 is opened. The effect of the first embodiment can be obtained while maintaining a desired spray angle by changing the angle formed by the center line of the nozzle hole 32 and the perpendicular of the inner surface of the plate that opens the nozzle hole 32 without changing the angle of the nozzle. . Further, with the same tool or the same processing setting, it is possible to form the injection hole 32a that does not delay the injection of the fuel spray and the injection hole 32b that delays the injection of the fuel spray having the same function as the first embodiment, and can improve the processing efficiency. .

次に、第３実施形態について説明する。第３実施形態も、第１実施形態および第２実施形態との相違は燃料噴射弁の構成だけなので、燃料噴射弁の構成についてのみ説明する。図５に第３実施形態の燃料噴射弁の構成を示す。針弁２１と、ノズルを形成するプレート４１と、プレート４１に開けられた燃料噴霧の噴射を遅延しない噴孔４２ａと、遅延する噴孔４２ｂで構成されている。遅延しない噴孔４２ａはサック部分に開けられている一方、遅延する噴孔４２ｂはノズルの先すぼまり状のサック部分より上流で、かつ針弁２１が着座するシート面よりも下流の位置に開けられている。   Next, a third embodiment will be described. Since the third embodiment also differs from the first embodiment and the second embodiment only in the configuration of the fuel injection valve, only the configuration of the fuel injection valve will be described. FIG. 5 shows the configuration of the fuel injection valve of the third embodiment. It comprises a needle valve 21, a plate 41 forming a nozzle, an injection hole 42a that does not delay the injection of fuel spray opened in the plate 41, and an injection hole 42b that delays. The non-delayed nozzle hole 42a is opened in the sack portion, while the delayed nozzle hole 42b is upstream of the tapered sack portion of the nozzle and downstream of the seat surface on which the needle valve 21 is seated. Opened.

このようにすれば、前記プレート４１に針弁２１のシート面より下流でかつサック部分より上流に配置した噴孔４２ｂの入口付近は、針弁２１のリフト初期において針弁２１とノズル内面との隙間にできる流路が絞られているため、圧力の立ち上がりが遅れ、噴霧が遅延して噴射されるので第１実施形態の効果を得ることができる。また、本実施形態も燃料噴霧の噴射を遅延しない噴孔４２ａと遅延する噴孔４２ｂとの燃料噴射弁１１の中心軸に対しての角度は同一で良いので、第２実施形態の効果も同様に得られる。   In this way, the vicinity of the inlet of the injection hole 42b arranged on the plate 41 downstream of the seat surface of the needle valve 21 and upstream of the sac portion is located between the needle valve 21 and the nozzle inner surface at the initial stage of lift of the needle valve 21. Since the flow path that can be formed in the gap is narrowed, the rise in pressure is delayed and the spray is ejected with a delay, so that the effect of the first embodiment can be obtained. Also, in this embodiment, the angle of the nozzle hole 42a that does not delay the injection of the fuel spray and the nozzle hole 42b that delays the center axis of the fuel injection valve 11 may be the same, so the effect of the second embodiment is also the same. Is obtained.

さらに、以上第１〜第３実施形態に共通して、燃料噴霧の噴射を遅延する噴孔の径を、遅延しない噴孔の径よりも大きくする構成としてもよく、このようにすれば、燃料噴霧の噴射を遅延する噴孔の流量低下を補い、噴孔間での燃料噴射量の格差が低減するため、燃焼室の週方向により偏りの少ない成層混合気を形成することが可能となる。   Further, in common with the first to third embodiments, the diameter of the nozzle hole that delays the injection of the fuel spray may be larger than the diameter of the nozzle hole that is not delayed. Since it compensates for the flow rate drop of the nozzle hole that delays spray injection and the difference in the fuel injection amount between the nozzle holes is reduced, it becomes possible to form a stratified mixture with less bias in the week direction of the combustion chamber.

本発明の各実施形態に共通した直噴式内燃機関の構成を示す図。The figure which shows the structure of the direct injection type internal combustion engine common to each embodiment of this invention. 第１実施形態に係る燃料噴射弁の要部構成を示す断面図。Sectional drawing which shows the principal part structure of the fuel injection valve which concerns on 1st Embodiment. 本発明による成層混合気形成の様子を示す図。The figure which shows the mode of stratified mixture formation by this invention. 第２実施形態に係る燃料噴射弁の要部構成を示す断面図。Sectional drawing which shows the principal part structure of the fuel injection valve which concerns on 2nd Embodiment. 第３実施形態に係る燃料噴射弁の要部構成を示す断面図。Sectional drawing which shows the principal part structure of the fuel injection valve which concerns on 3rd Embodiment.

符号の説明Explanation of symbols

１ 燃焼室
２ シリンダヘッド
３ シリンダブロック
４ ピストン
１１ 燃料噴射弁
１２ 点火プラグ
１４ キャビティ
２１ 針弁
２２，３１，４１ プレート
２２ａ，３１ａ，４１ａ 燃料噴霧の噴射を遅延しない噴孔
２２ｂ，３１ｂ，４１ｂ 燃料噴霧の噴射を遅延する噴孔 DESCRIPTION OF SYMBOLS 1 Combustion chamber 2 Cylinder head 3 Cylinder block 4 Piston 11 Fuel injection valve 12 Spark plug 14 Cavity 21 Needle valve 22, 31, 41 Plate 22a, 31a, 41a Injection hole 22b, 31b, 41b Fuel spray which does not delay injection of fuel spray Hole to delay the injection of

Claims (10)

燃焼室上部の略中心にシリンダ中心軸に対して噴霧中心軸を傾斜させて多孔式燃料噴射弁を装着し、ピストン冠面に前記燃料噴射弁からの燃料噴霧を受けるキャビティを設けた直噴式内燃機関であって、燃料噴射弁の各噴孔の中心軸に沿ったキャビティ壁面までの距離が近い側の噴孔ほど燃料噴霧を遅延して噴射することを特徴とする直噴式内燃機関。   A direct-injection internal combustion engine in which a fuel injection valve is installed at a substantially central position in the upper part of the combustion chamber with the spray central axis inclined with respect to the cylinder central axis, and a cavity for receiving fuel spray from the fuel injection valve is provided on the piston crown. A direct-injection internal combustion engine, characterized in that fuel spray is delayed and injected toward an injection hole closer to the cavity wall surface along the central axis of each injection hole of the fuel injection valve. 前記燃料噴霧を遅延して噴射する噴孔の中心線と噴孔が開口するプレート内面の垂線のなす角を、燃料噴霧の噴射を遅延させない噴孔の中心線と前記プレート内面の垂線のなす角よりも大きくすることを特徴とする請求項１記載の直噴式内燃機関。   The angle formed between the center line of the nozzle hole for injecting the fuel spray with a delay and the perpendicular line of the inner surface of the plate where the nozzle hole opens, and the angle between the center line of the nozzle hole for not injecting the fuel spray injection and the perpendicular line of the inner surface of the plate 2. The direct injection internal combustion engine according to claim 1, wherein the direct injection internal combustion engine is made larger. 前記プレートで形成されるノズルの先端の内面を曲面で構成することを特徴とする請求項２記載の直噴式内燃機関。   3. The direct injection internal combustion engine according to claim 2, wherein an inner surface of a tip of the nozzle formed by the plate is formed by a curved surface. 燃料噴霧を遅延する噴孔を、噴孔が開口するプレートの針弁が着座するシート面より下流でかつ先すぼまり状のサック部分より上流に配置することを特徴とする請求項１〜請求項３のいずれか１つに記載の直噴式内燃機関。   An injection hole for delaying fuel spray is disposed downstream of a seat surface on which a needle valve of a plate on which the injection hole is opened and upstream of a tapered sac portion. Item 4. The direct injection internal combustion engine according to any one of Items 3 to 3. 燃料噴霧を遅延する噴孔の径を、遅延しない噴孔の径よりも大きくすることを特徴とする請求項１〜請求項４のいずれか１つに記載の直噴式内燃機関。   The direct injection internal combustion engine according to any one of claims 1 to 4, wherein a diameter of the nozzle hole for delaying fuel spray is made larger than a diameter of the nozzle hole not delayed. 燃焼室上部の略中心にシリンダ中心軸に対して噴霧中心軸を傾斜させて装着され、ピストン冠面に形成されたキャビティに燃料噴霧が受け止められるように燃料噴射する多孔式燃料噴射弁であって、各噴孔の中心軸に沿ったキャビティ壁面までの距離が近い側の噴孔ほど燃料噴霧を遅延して噴射するように各噴孔を形成したことを特徴とする多孔式燃料噴射弁。   A porous fuel injection valve mounted at an approximately upper center of a combustion chamber with a spray central axis inclined with respect to a cylinder central axis and injecting fuel so that fuel spray is received in a cavity formed on a piston crown surface. A perforated fuel injection valve characterized in that each nozzle hole is formed such that the nozzle hole closer to the cavity wall surface along the central axis of each nozzle hole is injected with a delay in fuel spray. 前記燃料噴霧を遅延して噴射する噴孔の中心線と噴孔が開口するプレート内面の垂線のなす角を、燃料噴霧の噴射を遅延させない噴孔の中心線と前記プレート内面の垂線のなす角よりも大きくしたことを特徴とする請求項６記載の多孔式燃料噴射弁。   The angle formed between the center line of the nozzle hole for injecting the fuel spray with a delay and the perpendicular line of the inner surface of the plate where the nozzle hole opens, and the angle between the center line of the nozzle hole for not injecting the fuel spray injection and the perpendicular line of the inner surface of the plate The porous fuel injection valve according to claim 6, wherein the porous fuel injection valve is larger than the first fuel injection valve. 前記プレートで形成されるノズルの先端の内面を曲面で構成したことを特徴とする請求項６または請求項７に記載の多孔式燃料噴射弁。   The porous fuel injection valve according to claim 6 or 7, wherein an inner surface of a tip of the nozzle formed by the plate is formed by a curved surface. 燃料噴霧を遅延する噴孔を、噴孔が開口するプレートの針弁が着座するシート面より下流でかつ先すぼまり状のサック部分より上流に配置することを特徴とする請求項５〜請求項８のいずれか１つに記載の多孔式燃料噴射弁。   6. An injection hole for delaying fuel spraying is disposed downstream of a seat surface on which a needle valve of a plate in which the injection hole is opened and upstream of a tapered sac portion. Item 9. The porous fuel injection valve according to any one of Items 8. 燃料噴霧を遅延する噴孔の径を、遅延しない噴孔の径よりも大きくすることを特徴とする請求項５〜請求項９のいずれか１つに記載の多孔式燃料噴射弁。   The porous fuel injection valve according to any one of claims 5 to 9, wherein a diameter of the nozzle hole for delaying fuel spray is made larger than a diameter of the nozzle hole for which fuel spray is not delayed.
JP2003376574A 2003-11-06 2003-11-06 Direct injection internal combustion engine and multi-hole type fuel injection valve Pending JP2005139987A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003376574A JP2005139987A (en) 2003-11-06 2003-11-06 Direct injection internal combustion engine and multi-hole type fuel injection valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003376574A JP2005139987A (en) 2003-11-06 2003-11-06 Direct injection internal combustion engine and multi-hole type fuel injection valve

Publications (1)

Publication Number Publication Date
JP2005139987A true JP2005139987A (en) 2005-06-02

Family

ID=34687570

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003376574A Pending JP2005139987A (en) 2003-11-06 2003-11-06 Direct injection internal combustion engine and multi-hole type fuel injection valve

Country Status (1)

Country Link
JP (1) JP2005139987A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007009865A (en) * 2005-07-04 2007-01-18 Nissan Motor Co Ltd Cylinder direct injection type spark ignition internal combustion engine
JP2007146828A (en) * 2005-10-28 2007-06-14 Hitachi Ltd Fuel injection valve

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007009865A (en) * 2005-07-04 2007-01-18 Nissan Motor Co Ltd Cylinder direct injection type spark ignition internal combustion engine
JP4650126B2 (en) * 2005-07-04 2011-03-16 日産自動車株式会社 In-cylinder direct injection spark ignition internal combustion engine
JP2007146828A (en) * 2005-10-28 2007-06-14 Hitachi Ltd Fuel injection valve

Similar Documents

Publication Publication Date Title
JP2002539365A (en) Direct injection internal combustion engine
US7047946B2 (en) Method for operating an internal combustion engine
JP2007315276A (en) Multi-hole type injector
US7104247B2 (en) Direct fuel injection engine
JP2007138779A (en) Cylinder injection internal combustion engine
JP2004036554A (en) Fuel injection device, internal combustion engine, and controlling method of fuel injection device
JP4069750B2 (en) In-cylinder direct injection spark ignition internal combustion engine
JP3997781B2 (en) In-cylinder direct injection engine
JP2005139989A (en) Cylinder direct injection type internal combustion engine
JP2007138780A (en) Auxiliary chamber type internal combustion engine
JP2005139987A (en) Direct injection internal combustion engine and multi-hole type fuel injection valve
EP1316697B1 (en) Cylinder injection type spark ignition engine
JP2007231913A (en) Fuel injection device for internal combustion engine
JP2004324558A (en) Fuel injection valve for internal combustion engine
JP2005264815A (en) Internal combustion engine
JP4126977B2 (en) In-cylinder direct injection internal combustion engine
JPH01110827A (en) Spark assisting type diesel engine
JP2003214296A (en) Fuel injection valve
JP2002013417A (en) Method to provide fuel-air mixture in internal combustion engine by gasoline direct injection and internal combustion engine accompanied with gasoline direct injection
JP2003269176A (en) Cylinder direct injection engine
JP2009209742A (en) Multiple injection hole fuel injection nozzle
JP2009019539A (en) Cylinder direct injection type internal combustion engine
JP2005330915A (en) Control device of internal combustion engine
JPH06336931A (en) Combustion chamber for auxiliary chamber type internal combustion engine
JP4026406B2 (en) Direct-injection spark ignition internal combustion engine