JPH1030441A - Cylinder fuel injection type spark ignition engine - Google Patents
Cylinder fuel injection type spark ignition engineInfo
- Publication number
- JPH1030441A JPH1030441A JP8189285A JP18928596A JPH1030441A JP H1030441 A JPH1030441 A JP H1030441A JP 8189285 A JP8189285 A JP 8189285A JP 18928596 A JP18928596 A JP 18928596A JP H1030441 A JPH1030441 A JP H1030441A
- Authority
- JP
- Japan
- Prior art keywords
- combustion
- combustion chamber
- exhaust valve
- tumble flow
- wedge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- F02B75/00—Other engines
- F02B75/12—Other methods of operation
- F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-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
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/48—Tumble motion in gas movement in cylinder
-
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、燃焼室内に直接燃
料を噴射して点火プラグにより着火させる筒内噴射式火
花点火機関に関する。The present invention relates to a direct injection type spark ignition engine in which fuel is directly injected into a combustion chamber and ignited by a spark plug.
【０００２】[0002]
【従来の技術】このような筒内噴射式火花点火機関にお
いて、燃料を点火プラグ近傍に集中させることにより、
着火性を確保し、全体的にリーンな混合気を燃焼可能に
する成層燃焼を実現することが公知である。このような
成層燃焼においても、燃焼室内に乱れを発生させると、
燃焼速度が速まり燃焼を良好なものとすることができる
ために、吸気系の構造により燃焼室内にタンブル流を生
成することが提案されている。2. Description of the Related Art In such a direct injection type spark ignition engine, fuel is concentrated near an ignition plug,
It is known to achieve stratified combustion which ensures ignitability and enables combustion of a lean mixture as a whole. Even in such stratified combustion, if turbulence occurs in the combustion chamber,
It has been proposed to generate a tumble flow in a combustion chamber by a structure of an intake system in order to increase a combustion speed and improve combustion.
【０００３】しかしながら、このようなタンブル流によ
って、点火プラグ近傍に集中させた燃料が発散して着火
性が悪化することがある。この問題を解決するために、
特開平５−３３６５０号公報には、タンブル流が生成さ
れる筒内噴射式火花点火機関において、点火プラグを燃
焼室の側壁上部に配置し、この点火プラグ近傍に燃料を
噴射する燃料噴射弁を設け、ピストン頂面に、タンブル
流が点火プラグ側の燃焼室側壁に沿って上昇しないよう
にするためのリフレクタを形成するものが開示されてい
る。[0003] However, such a tumble flow may cause the fuel concentrated near the spark plug to diverge and deteriorate the ignitability. to solve this problem,
Japanese Patent Application Laid-Open No. 5-33650 discloses a direct injection type spark ignition engine in which a tumble flow is generated, in which a spark plug is arranged above a side wall of a combustion chamber and a fuel injection valve for injecting fuel near the spark plug is provided. There is disclosed an apparatus provided with a reflector on the top surface of the piston to prevent the tumble flow from rising along the side wall of the combustion chamber on the side of the ignition plug.
【０００４】この従来技術によって、成層燃焼時に点火
プラグ近傍に集中させた燃料は、タンブル流がリフレク
タによって偏向され点火プラグ近傍に到来しないため
に、タンブル流によって発散されることはなく、確実な
着火性を保証することができる。According to this prior art, the fuel concentrated in the vicinity of the spark plug during stratified combustion is not diverged by the tumble flow because the tumble flow is deflected by the reflector and does not reach the vicinity of the spark plug. Can be guaranteed.
【０００５】成層燃焼は低燃費ではあるが高い出力を得
ることはできない。それにより、このような筒内噴射式
火花点火機関でも、機関高負荷時には均一燃焼が行われ
る。均一燃焼の際には、吸気行程中に燃料が噴射され、
前述のタンブル流によって点火までに燃焼室内に均一混
合気を形成することが意図されている。[0005] Stratified combustion has low fuel consumption but cannot obtain high output. As a result, even in such a direct injection type spark ignition engine, uniform combustion is performed at a high engine load. During uniform combustion, fuel is injected during the intake stroke,
It is intended that a homogeneous mixture be formed in the combustion chamber by the above-mentioned tumble flow before ignition.
【０００６】[0006]
【発明が解決しようとする課題】前述の従来技術におい
て、燃焼室内に形成されるタンブル流は、縦方向に旋回
する際に、高温度の排気弁及びピストン頂面に接触して
受熱するが、低温度の吸気弁にも接触して冷却され、結
果的にそれほど高温度とはならない。それにより、均一
燃焼時において吸気行程中に噴射された燃料は十分に気
化せず、点火時点において燃焼室内に十分に均一化され
た混合気を形成することができないために、良好な均一
燃焼を実現することはできない。In the prior art described above, the tumble flow formed in the combustion chamber receives heat by contacting the high-temperature exhaust valve and the top surface of the piston when swirling in the vertical direction. It cools in contact with the low-temperature intake valve, and as a result, does not become so hot. As a result, the fuel injected during the intake stroke during uniform combustion does not sufficiently evaporate, and it is not possible to form a sufficiently uniform mixture in the combustion chamber at the time of ignition. It cannot be realized.
【０００７】従って、本発明の目的は、燃焼室内にタン
ブル流が生成される筒内噴射式火花点火機関において、
成層燃焼時の確実な着火性を確保すると共に、均一燃焼
時の良好な燃焼を実現することである。Accordingly, an object of the present invention is to provide a direct injection type spark ignition engine in which a tumble flow is generated in a combustion chamber.
An object of the present invention is to ensure reliable ignitability during stratified combustion and to realize good combustion during uniform combustion.
【０００８】[0008]
【課題を解決するための手段】請求項１に記載の本発明
による筒内噴射式火花点火機関は、燃焼室内へ燃料を噴
射する燃料噴射弁と、燃焼室内に臨む点火プラグとを具
備し、ピストン頂面に吸気弁側から排気弁側に向かい先
細の楔形隆起部を設け、前記楔形隆起部の上面における
排気弁側部分が排気弁側の燃焼室側壁に沿って下降しピ
ストン頂面に到達するタンブル流を二分割するように形
成され、前記楔形隆起部の二つの側面が前記排気弁側部
分によって二分割されたタンブル流をそれぞれ上向きに
偏向するように形成され、前記楔形隆起部の上面におけ
る吸気弁側部分が前記燃料噴射弁から圧縮行程において
噴射された燃料を前記点火プラグ近傍に導くように形成
されていることを特徴とする。According to a first aspect of the present invention, there is provided a direct injection type spark ignition engine according to the present invention, comprising: a fuel injection valve for injecting fuel into a combustion chamber; and a spark plug facing the combustion chamber. A tapered wedge-shaped ridge is provided on the piston top surface from the intake valve side to the exhaust valve side, and the exhaust valve side portion on the upper surface of the wedge-shaped ridge descends along the combustion chamber side wall on the exhaust valve side to reach the piston top surface. The wedge-shaped ridge is formed so as to divide the tumble flow divided into two, and the two side surfaces of the wedge-shaped ridge are formed so as to deflect the tumble flow divided by the exhaust valve-side portion upward, respectively. Is formed so as to guide the fuel injected from the fuel injection valve in the compression stroke to the vicinity of the ignition plug.
【０００９】この筒内噴射式火花点火機関においては、
排気弁側の燃焼室側壁に沿って下降するタンブル流が、
ピストン頂面の楔形隆起部の上面における排気弁側部分
によって二分割され、その後、楔形隆起部の側面によっ
て上向きに偏向されるために、吸気弁には接触しない二
つのタンブル流が生成される。また、ピストン頂面の楔
形隆起部の上面における吸気弁側部分の上側は、二つの
タンブル流によって影響されない吸気淀み空間となる。In this cylinder injection type spark ignition engine,
The tumble flow descending along the combustion chamber side wall on the exhaust valve side,
Two tumble flows that do not touch the intake valve are created because they are bisected by the exhaust valve-side portion at the top surface of the wedge-shaped ridge on the piston top surface and then deflected upward by the side surface of the wedge-shaped ridge. Further, the upper side of the intake valve side portion on the upper surface of the wedge-shaped ridge on the piston top surface is an intake stagnation space unaffected by the two tumble flows.
【００１０】[0010]
【発明の実施の形態】図１は、圧縮行程初期における本
発明による筒内噴射式火花点火機関の第１実施形態を示
す吸排気ポートを通る概略縦断面図である。同図におい
て、１は燃焼室上壁面に開口する吸気ポートであり、２
はこの開口部を開閉可能な吸気弁である。３は燃焼室上
壁面に開口する排気ポートであり、４はこの開口部を開
閉可能な排気弁である。５は気筒内を摺動するピストン
である。吸気ポート１は、吸気行程において、燃焼室内
に排気ポート側の側壁に沿って下降するタンブル流を生
成するような構造を有している。燃料噴射弁６は、吸気
ポート１側の燃焼室の側壁上部に配置されている。FIG. 1 is a schematic longitudinal sectional view through an intake / exhaust port showing a first embodiment of a direct injection type spark ignition engine according to the present invention at an early stage of a compression stroke. In the figure, reference numeral 1 denotes an intake port which opens to the upper wall of the combustion chamber,
Is an intake valve that can open and close this opening. Reference numeral 3 denotes an exhaust port that opens on the upper wall surface of the combustion chamber, and reference numeral 4 denotes an exhaust valve that can open and close this opening. Reference numeral 5 denotes a piston that slides in the cylinder. The intake port 1 has a structure that generates a tumble flow descending along the side wall on the exhaust port side in the combustion chamber during the intake stroke. The fuel injection valve 6 is arranged on the upper part of the side wall of the combustion chamber on the intake port 1 side.
【００１１】図２はピストン５の頂面を示す平面図であ
り、図３は図２のＡ−Ａ断面図である。図１，２、及び
３を参照すると、ピストン５の頂面には、吸気弁側から
排気弁側に向かい先細の楔形隆起部１０が設けられてい
る。この楔形隆起部１０は上面と二つの側面１０ｃ，１
０ｄを有し、この上面は、それぞれが燃焼室上壁面方向
に傾斜する排気弁側部分１０ａと吸気弁側部分１０ｂと
を有している。これらの二つの側面１０ｃ，１０ｄは、
ピストン５中心方向に湾曲し、滑らかにピストン５の頂
面に接続されている。楔形隆起部１０の上面の排気弁側
部分１０ａは、排気ポート側の燃焼室側壁に沿って下降
するタンブル流を二分割するように機能する。このよう
に二分割されたタンブル流は、それぞれ、楔形隆起部１
０の側面１０ｃ，１０ｄによって燃焼室内を上昇し、白
抜矢印で示すように、ほぼ楔形隆起部１０の側面１０
ｃ，１０ｄに沿った二つのタンブル流が生成される。FIG. 2 is a plan view showing the top surface of the piston 5, and FIG. 3 is a sectional view taken along line AA of FIG. Referring to FIGS. 1, 2, and 3, on the top surface of the piston 5, a tapered wedge-shaped ridge 10 is provided from the intake valve side to the exhaust valve side. The wedge-shaped ridge 10 has an upper surface and two side surfaces 10c, 1
The upper surface has an exhaust valve side portion 10a and an intake valve side portion 10b, each of which is inclined toward the upper wall surface of the combustion chamber. These two sides 10c, 10d are:
It is curved toward the center of the piston 5 and is smoothly connected to the top surface of the piston 5. The exhaust valve side portion 10a on the upper surface of the wedge-shaped ridge 10 functions to divide the tumble flow descending along the combustion chamber side wall on the exhaust port side into two parts. The tumble flows divided into two in this manner are respectively wedge-shaped ridges 1
0 rises in the combustion chamber by the side surfaces 10c and 10d, and the side surface 10 of the substantially wedge-shaped ridge 10 as shown by a white arrow.
Two tumble flows along c and 10d are generated.
【００１２】このように生成されたタンブル流は、いず
れも、排気弁４及びピストン５頂面には接触するが、吸
気弁２には接触しないように旋回するために、排気ガス
熱及び燃焼熱によって高温度とされた排気弁４及びピス
トン５頂面によって十分に加熱されるが、吸気通過に伴
い比較的低温度となっている吸気弁２によって冷却され
ることはなく、高温度に維持される。The tumble flow generated in this way is swirled so as to contact the exhaust valve 4 and the top surface of the piston 5 but not to contact the intake valve 2, so that the exhaust gas heat and the combustion heat Is sufficiently heated by the exhaust valve 4 and the top surface of the piston 5 which have been heated to a high temperature, but is not cooled by the intake valve 2 which has a relatively low temperature as the intake air passes, and is maintained at a high temperature. You.
【００１３】図４は、圧縮行程後半における本発明によ
る筒内噴射式火花点火機関の第１実施形態を示す気筒中
心を通る概略縦断面図である。同図に示すように、点火
プラグ７は燃焼室上壁面の略中心に配置されている。ピ
ストン５の楔形隆起部１０の上面の吸気弁側部分１０ｂ
には、部分球形状の窪み１０ｅが形成されている。燃料
噴射弁６は、圧縮行程後半において、この窪み１０ｅ内
に燃料を噴射可能なように配置されており、窪み１０ｅ
内に噴射された燃料は、点火プラグ７の近傍に向かうよ
うになっている。FIG. 4 is a schematic longitudinal sectional view of a first embodiment of the direct injection spark ignition engine according to the present invention in the latter half of the compression stroke passing through the center of the cylinder. As shown in the figure, the ignition plug 7 is disposed substantially at the center of the upper wall surface of the combustion chamber. Intake valve side portion 10b of the upper surface of wedge-shaped protrusion 10 of piston 5
Is formed with a partially spherical depression 10e. The fuel injection valve 6 is disposed so as to be able to inject fuel into the depression 10e in the latter half of the compression stroke.
The fuel injected inside is directed toward the vicinity of the ignition plug 7.
【００１４】本実施形態の筒内噴射式火花点火機関は、
機関低負荷時において成層燃焼を実施するものであり、
成層燃焼は全体的な空燃比を理論空燃比よりリーンにす
ることができるために、燃費低減が可能となる。このよ
うな成層燃焼を実施する際には、燃料噴射弁６によって
圧縮行程後半に燃料を噴射するようになっている。前述
したように、この時に噴射された燃料は、ピストン５の
楔形隆起部１０の窪み１０ｅ内に噴射され、窪み１０ｅ
内でピストン５に十分に接触することによりピストンの
熱によって十分に気化されて点火プラグ７近傍に向か
う。The in-cylinder injection spark ignition engine of the present embodiment
When stratified combustion is performed at low engine load,
In the stratified combustion, the overall air-fuel ratio can be made leaner than the stoichiometric air-fuel ratio, so that fuel consumption can be reduced. When performing such stratified combustion, fuel is injected by the fuel injection valve 6 in the latter half of the compression stroke. As described above, the fuel injected at this time is injected into the depression 10e of the wedge-shaped protrusion 10 of the piston 5, and the depression 10e
When the piston 5 is sufficiently in contact with the inside, the gas is sufficiently vaporized by the heat of the piston and moves toward the vicinity of the spark plug 7.
【００１５】この時、二つのタンブル流は、吸気弁２に
接触しないように二股に別れて旋回しているために、ピ
ストン５の楔形隆起部１０における上面の吸気弁側部分
１０ｂの上側は、点火プラグ７近傍を含み吸気淀み空間
となっているために、燃焼室内の点火プラグ７近傍に比
較的濃厚な混合気を拡散させることなく確実に形成する
ことができる。それにより、良好な着火性を確保するこ
とができる。点火時点において、高温度に維持されたタ
ンブル流は、ピストン５頂面と燃焼室上壁面との間で押
し潰されて多数の小さな渦流となり、点火プラグ７近傍
の混合気の回りに強い乱れが生成されるために、燃焼後
期における燃焼速度を速くすることができ、良好な成層
燃焼を実現することができる。At this time, since the two tumble flows are bifurcated and turned so as not to contact the intake valve 2, the upper side of the intake valve side portion 10b of the upper surface of the wedge-shaped ridge 10 of the piston 5 is: Since the intake stagnation space includes the vicinity of the ignition plug 7, a relatively rich mixture can be reliably formed without diffusing the mixture near the ignition plug 7 in the combustion chamber. Thereby, good ignitability can be secured. At the time of ignition, the tumble flow maintained at a high temperature is crushed between the top surface of the piston 5 and the upper wall surface of the combustion chamber to form a number of small swirls, and strong turbulence around the air-fuel mixture near the ignition plug 7 occurs. Since it is generated, the combustion speed in the latter stage of combustion can be increased, and good stratified combustion can be realized.
【００１６】また、本実施形態の筒内噴射式火花点火機
関は、機関高負荷時において高出力を得られる均一燃焼
を実施するものである。このような均一燃焼を実施する
際には、燃料噴射弁６によって吸気行程に燃料を噴射す
るようになっている。この時に噴射された燃料は、タン
ブル流に衝突して燃焼室全体に拡散する。タンブル流
は、前述したように高温度に維持されているために、噴
射された燃料を十分に気化させ、点火時点において燃焼
室内に十分に均一化された混合気を形成することがで
き、タンブル流が押し潰されて形成される燃焼室内全体
の小さな渦流によって、燃焼速度の速い良好な均一燃焼
が実現され、高い機関出力を得ることができる。もちろ
ん、機関中負荷時等において、必要燃料量の一部を吸気
行程に噴射して気筒内に希薄な均一混合気を形成し、残
りを圧縮行程に噴射して点火プラグ７近傍に比較的濃厚
な混合気を形成することにより、比較的高い機関出力が
得られる成層燃焼を実施することも可能である。Further, the in-cylinder injection spark ignition engine of the present embodiment performs a uniform combustion that can obtain a high output at a high engine load. When performing such uniform combustion, fuel is injected by the fuel injection valve 6 during the intake stroke. The fuel injected at this time collides with the tumble flow and diffuses throughout the combustion chamber. Since the tumble flow is maintained at a high temperature as described above, the injected fuel can be sufficiently vaporized, and a sufficiently uniform mixture can be formed in the combustion chamber at the time of ignition. Due to the small swirl in the entire combustion chamber formed by crushing the flow, good uniform combustion with a high combustion speed is realized, and a high engine output can be obtained. Of course, when the engine is under a medium load, a part of the required fuel amount is injected into the intake stroke to form a lean homogeneous mixture in the cylinder, and the remaining fuel is injected into the compression stroke to produce a relatively rich mixture near the ignition plug 7. By forming an appropriate air-fuel mixture, it is also possible to perform stratified combustion that can obtain a relatively high engine output.
【００１７】本実施形態において、点火プラグ７は燃焼
室上壁面の略中央部に配置することができ、それによ
り、燃焼室内全体に火炎が均一に伝播するために、燃焼
を良好なものにすることができる。また、点火プラグ７
が燃焼室上壁面の排気ポート側に配置される場合に比較
して配置位置の温度は低く、ノッキング及びプレイグニ
ッション等の異常燃焼を防止することができる。燃料噴
射弁６は、燃焼室内で比較的温度が低い吸気ポート近傍
に配置されているために、ベーパ発生等の問題を防止す
ることができる。In the present embodiment, the ignition plug 7 can be arranged at a substantially central portion of the upper wall surface of the combustion chamber, and thereby, the flame is uniformly propagated throughout the combustion chamber, so that the combustion is improved. be able to. In addition, the spark plug 7
Is disposed at a lower temperature than when it is disposed on the exhaust port side of the upper wall surface of the combustion chamber, and abnormal combustion such as knocking and pre-ignition can be prevented. Since the fuel injection valve 6 is disposed near the intake port having a relatively low temperature in the combustion chamber, it is possible to prevent problems such as generation of vapor.
【００１８】[0018]
【発明の効果】このように、請求項１に記載の本発明に
よる筒内噴射式火花点火機関によれば、排気弁側の燃焼
室側壁に沿って下降するタンブル流が、ピストン頂面の
楔形隆起部の上面における排気弁側部分によって二分割
され、その後、楔形隆起部の側面によって上向きに偏向
されるために、低温度の吸気弁には接触しない二つのタ
ンブル流が生成され、これらのタンブル流は、高温度の
排気弁及びピストン頂面から受熱して高温度に維持さ
れ、吸気行程中に噴射された燃料を十分に気化させ、点
火時点において燃焼室内に十分に均一化された混合気を
形成することができ良好な均一燃焼を実現することが可
能となる。As described above, according to the in-cylinder injection spark ignition engine according to the first aspect of the present invention, the tumble flow descending along the combustion chamber side wall on the exhaust valve side is formed in a wedge shape on the piston top surface. Two tumble flows are created that are bisected by the exhaust valve side at the top of the ridge and then deflected upward by the sides of the wedge-shaped ridge, so that they do not contact the low temperature intake valve. The flow is maintained at a high temperature by receiving heat from the high-temperature exhaust valve and piston top surface, sufficiently vaporizing the fuel injected during the intake stroke, and sufficiently homogenizing the mixture into the combustion chamber at the time of ignition. Can be formed, and good uniform combustion can be realized.
【００１９】また、ピストン頂面の楔形隆起部の上面に
おける吸気弁側部分の上側は、二つのタンブル流によっ
て影響されない吸気淀み空間となり、圧縮行程において
噴射された燃料は、この吸気弁側部分によって点火プラ
グ近傍に導かれ、点火プラグ近傍に拡散することなく導
びかれ、点火プラグ近傍に比較的濃厚な混合気を形成す
ることができ、成層燃焼時における確実な着火性を確保
することができる。The upper side of the intake valve side portion on the upper surface of the wedge-shaped ridge on the piston top surface is an intake stagnation space unaffected by the two tumble flows, and the fuel injected during the compression stroke is supplied by the intake valve side portion. It is guided near the spark plug and is guided without diffusing to the vicinity of the spark plug, and a relatively rich air-fuel mixture can be formed near the spark plug, and secure ignitability during stratified combustion can be ensured. .
【図１】圧縮行程前半における本発明による筒内噴射式
火花点火機関の実施形態を示す吸排気ポートを通る概略
縦断面図である。FIG. 1 is a schematic longitudinal sectional view through an intake / exhaust port showing an embodiment of a direct injection spark ignition engine according to the present invention in the first half of a compression stroke.
【図２】図１のピストン頂面を示す平面図である。FIG. 2 is a plan view showing a top surface of the piston of FIG. 1;
【図３】図２のＡ−Ａ断面図である。FIG. 3 is a sectional view taken along line AA of FIG. 2;
【図４】圧縮行程後半における本発明による筒内噴射式
火花点火機関の実施形態を示す気筒中心を通る概略縦断
面図である。FIG. 4 is a schematic longitudinal sectional view passing through the center of the cylinder, showing an embodiment of the in-cylinder injection spark ignition engine according to the present invention in the latter half of the compression stroke.
【符号の説明】 １…吸気ポート ３…排気ポート ５…ピストン ６…燃料噴射弁 ７…点火プラグ １０…楔形隆起部 １０ａ…上面の排気弁側部分 １０ｂ…上面の吸気弁側部分 １０ｃ，１０ｄ…楔形隆起部の側面 １０ｅ…窪み[Description of Signs] 1 ... Intake port 3 ... Exhaust port 5 ... Piston 6 ... Fuel injection valve 7 ... Ignition plug 10 ... Wedge-shaped ridge 10a ... Exhaust valve side portion on top 10b ... Top intake valve side portion 10c, 10d ... Side surface of the wedge-shaped ridge 10e: recess
───────────────────────────────────────────────────── フロントページの続き (72)発明者 北東 宏之 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hiroyuki Kitahi 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation
Claims (1)
と、燃焼室内に臨む点火プラグとを具備し、ピストン頂
面に吸気弁側から排気弁側に向かい先細の楔形隆起部を
設け、前記楔形隆起部の上面における排気弁側部分が排
気弁側の燃焼室側壁に沿って下降しピストン頂面に到達
するタンブル流を二分割するように形成され、前記楔形
隆起部の二つの側面が前記排気弁側部分によって二分割
されたタンブル流をそれぞれ上向きに偏向するように形
成され、前記楔形隆起部の上面における吸気弁側部分が
前記燃料噴射弁から圧縮行程において噴射された燃料を
前記点火プラグ近傍に導くように形成されていることを
特徴とする筒内噴射式火花点火機関。1. A fuel injection valve for injecting fuel into a combustion chamber, and a spark plug facing the combustion chamber, wherein a wedge-shaped ridge tapered from an intake valve side to an exhaust valve side is provided on a piston top surface, The exhaust valve side portion on the upper surface of the wedge-shaped ridge is formed so as to divide the tumble flow that descends along the combustion chamber side wall on the exhaust valve side and reaches the piston top surface, and the two side surfaces of the wedge-shaped ridge are The tumble flow divided into two parts by the exhaust valve-side part is formed so as to deflect upward, respectively, and the intake valve-side part on the upper surface of the wedge-shaped protruding part discharges fuel injected from the fuel injection valve in the compression stroke by the ignition plug. An in-cylinder injection spark ignition engine characterized by being formed so as to be guided to the vicinity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18928596A JP3175598B2 (en) | 1996-07-18 | 1996-07-18 | In-cylinder injection spark ignition engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18928596A JP3175598B2 (en) | 1996-07-18 | 1996-07-18 | In-cylinder injection spark ignition engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1030441A true JPH1030441A (en) | 1998-02-03 |
| JP3175598B2 JP3175598B2 (en) | 2001-06-11 |
Family
ID=16238772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18928596A Expired - Fee Related JP3175598B2 (en) | 1996-07-18 | 1996-07-18 | In-cylinder injection spark ignition engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3175598B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999067514A1 (en) | 1998-06-22 | 1999-12-29 | Hitachi, Ltd. | Cylinder-injection type internal combustion engine, method of controlling the engine, and fuel injection nozzle |
| WO2000077360A1 (en) * | 1999-06-11 | 2000-12-21 | Hitachi, Ltd. | Cylinder injection engine and fuel injection nozzle used for the engine |
| WO2000077359A1 (en) * | 1999-06-11 | 2000-12-21 | Hitachi, Ltd. | Cylinder injection engine and method of combusting the engine |
| JP2007327464A (en) * | 2006-06-09 | 2007-12-20 | Toyota Motor Corp | Direct injection type spark ignition internal combustion engine |
-
1996
- 1996-07-18 JP JP18928596A patent/JP3175598B2/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999067514A1 (en) | 1998-06-22 | 1999-12-29 | Hitachi, Ltd. | Cylinder-injection type internal combustion engine, method of controlling the engine, and fuel injection nozzle |
| US6390059B1 (en) | 1998-06-22 | 2002-05-21 | Hitachi, Ltd. | Cylinder-injection type internal combustion engine, method of controlling the engine, and fuel injection nozzle |
| US6427659B2 (en) | 1998-06-22 | 2002-08-06 | Hitachi, Ltd. | Cylinder injection type internal combustion engine, control method for internal combustion engine, and fuel injection valve |
| US6520144B2 (en) | 1998-06-22 | 2003-02-18 | Hitachi, Ltd. | Cylinder injection type internal combustion engine, control method for internal combustion engine, and fuel injection valve |
| US6732706B2 (en) | 1998-06-22 | 2004-05-11 | Hitachi, Ltd. | Cylinder injection type internal combustion engine, control method for internal combustion engine, and fuel injection valve |
| US7013863B2 (en) | 1998-06-22 | 2006-03-21 | Hitachi, Ltd. | Cylinder injection type internal combustion engine, control method for internal combustion engine, and fuel injection valve |
| US7121253B2 (en) | 1998-06-22 | 2006-10-17 | Hitachi, Ltd. | Cylinder injection type internal combustion engine, control method for internal combustion engine, and fuel injection valve |
| WO2000077360A1 (en) * | 1999-06-11 | 2000-12-21 | Hitachi, Ltd. | Cylinder injection engine and fuel injection nozzle used for the engine |
| WO2000077359A1 (en) * | 1999-06-11 | 2000-12-21 | Hitachi, Ltd. | Cylinder injection engine and method of combusting the engine |
| US6659075B1 (en) | 1999-06-11 | 2003-12-09 | Hitachi, Ltd. | Cylinder injection engine and method of combusting engine |
| US6722340B1 (en) | 1999-06-11 | 2004-04-20 | Hitachi, Ltd. | Cylinder injection engine and fuel injection nozzle used for the engine |
| JP2007327464A (en) * | 2006-06-09 | 2007-12-20 | Toyota Motor Corp | Direct injection type spark ignition internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3175598B2 (en) | 2001-06-11 |
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