JPH08165975A - Ignition device for internal combustion engine - Google Patents
Ignition device for internal combustion engineInfo
- Publication number
- JPH08165975A JPH08165975A JP6333080A JP33308094A JPH08165975A JP H08165975 A JPH08165975 A JP H08165975A JP 6333080 A JP6333080 A JP 6333080A JP 33308094 A JP33308094 A JP 33308094A JP H08165975 A JPH08165975 A JP H08165975A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- ignition
- jet
- internal combustion
- combustion engine
- 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
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 17
- 239000000446 fuel Substances 0.000 claims abstract description 70
- 238000002347 injection Methods 0.000 claims abstract description 15
- 239000007924 injection Substances 0.000 claims abstract description 15
- 230000002950 deficient Effects 0.000 abstract 1
- 239000007921 spray Substances 0.000 description 17
- 230000015556 catabolic process Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- 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
- 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
Landscapes
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は直接噴射式内燃機関に適
用される点火装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition device applied to a direct injection type internal combustion engine.
【０００２】[0002]
【従来の技術】図３及び図４を参照し直接噴射式内燃機
関で点火栓によって着火する方式の従来例の一例につい
て説明する。図は燃料が燃料弁１から噴射され、それに
向って高温、高圧のガスジェット１１ａが噴出し、燃料
噴霧１２に着火する状況を模式に示したものである。2. Description of the Related Art An example of a conventional example of a method of igniting a direct injection type internal combustion engine with a spark plug will be described with reference to FIGS. The figure schematically shows a situation in which fuel is injected from the fuel valve 1, a high-temperature, high-pressure gas jet 11 a is ejected toward the fuel valve, and the fuel spray 12 is ignited.
【０００３】燃料弁１と点火栓４ａはシリンダヘッド３
に装着され、燃料弁１からの燃料が燃料噴霧１２となっ
てピストン１３とシリンダヘッド３とで構成された燃焼
室へ噴射される。点火栓４ａはキャビティ９ａと、オリ
フィス１０ａと、中心電極７ａと、接地電極６ａから構
成され、オリフィス１０ａは点火栓４ａの底面に設けら
れている。The fuel valve 1 and the spark plug 4a are attached to the cylinder head 3
The fuel from the fuel valve 1 becomes fuel spray 12 and is injected into the combustion chamber composed of the piston 13 and the cylinder head 3. The spark plug 4a includes a cavity 9a, an orifice 10a, a center electrode 7a, and a ground electrode 6a. The orifice 10a is provided on the bottom surface of the spark plug 4a.
【０００４】前記従来例の作用について説明する。図示
しない燃料噴射ポンプからの燃料が燃料弁１に供給さ
れ、燃料噴霧１２が形成される。燃料の噴射開始後運転
条件にマッチしたタイミングで図示しない点火回路から
中心電極７ａに高電圧が印加されると、中心電極７ａと
接地電極６ａとの間隙に絶縁破壊が起こり火花放電８ａ
を発生する。The operation of the conventional example will be described. Fuel from a fuel injection pump (not shown) is supplied to the fuel valve 1 to form the fuel spray 12. When a high voltage is applied to the center electrode 7a from an ignition circuit (not shown) at a timing that matches the operating conditions after the start of fuel injection, dielectric breakdown occurs in the gap between the center electrode 7a and the ground electrode 6a, and the spark discharge 8a.
Occurs.
【０００５】該火花放電が生じた後ある時間の間図示し
ない点火回路からエネルギが供給され、火花放電８ａが
持続され、キャビティ９ａからシリンダ内にガスが高速
ジェット１１ａとして下方に噴出する。オリフィス１０
ａから噴出した高温、高圧のガスジェット１１ａは、燃
料噴霧１２に衝突し、これにより燃料が着火され、燃焼
を開始する。Energy is supplied from an ignition circuit (not shown) for a certain time after the spark discharge, the spark discharge 8a is continued, and gas is jetted downward from the cavity 9a into the cylinder as a high-speed jet 11a. Orifice 10
The high temperature, high pressure gas jet 11a ejected from a collides with the fuel spray 12 to ignite the fuel and start combustion.
【０００６】[0006]
【発明が解決しようとする課題】ところが、前記従来例
には次記のような問題がある。即ち直接噴射内燃機関で
は、燃料が燃焼室内に直接高圧力で噴射されるため、燃
料噴霧１２の燃料流速は極めて高速となり、燃料の点火
に必要なエネルギは図５に示すように高いエネルギを必
要とすることになる。However, the above-mentioned conventional example has the following problems. That is, in the direct injection internal combustion engine, the fuel is directly injected into the combustion chamber at a high pressure, so that the fuel flow velocity of the fuel spray 12 becomes extremely high, and the energy required for ignition of the fuel requires high energy as shown in FIG. Will be.
【０００７】前記点火方式は、高速で流れる燃料の噴流
１４内に高温、高圧のガスジェット１１ａを投入するこ
とにより、燃料への点火を行なうものであるが、高温、
高圧のガスジェット１１ａにより点火、燃焼させるため
には高いエネルギを図示しない点火回路から中心電極７
ａに供給するか、もしくは燃料噴霧１２の流速を低下さ
せるか、もしくは燃料噴霧１２の流速が低下している燃
焼室外側方向へガスジェット１１ａの噴出方向を移動す
る必要がある。In the above-mentioned ignition system, the fuel is ignited by injecting a high-temperature, high-pressure gas jet 11a into a jet flow 14 of fuel flowing at high speed.
In order to ignite and burn by the high pressure gas jet 11a, a high energy is supplied from an ignition circuit (not shown) to the center electrode 7
It is necessary to supply the gas a to the fuel cell a, reduce the flow velocity of the fuel spray 12, or move the jet direction of the gas jet 11a toward the outside of the combustion chamber where the flow velocity of the fuel spray 12 is reduced.
【０００８】[0008]
【課題を解決するための手段】本発明に係る内燃機関の
点火装置は、シリンダ内に直接燃料を噴射し点火栓４に
より着火する内燃機関において、前記点火栓を燃料噴射
方向１５と交差し燃料噴流内に突出させて配置すると共
に、前記点火栓がキャビティ９と、燃料噴流下流側に設
けられたオリフィス１０と、中心電極７と、接地電極６
とから構成されたことを特徴としている。An internal combustion engine ignition apparatus according to the present invention is an internal combustion engine in which fuel is directly injected into a cylinder and ignited by an ignition plug 4, and the ignition plug intersects a fuel injection direction 15 and fuel is injected. The spark plug is arranged so as to project into the jet flow, and the spark plug has a cavity 9, an orifice 10 provided on the downstream side of the fuel jet flow, a center electrode 7, and a ground electrode 6.
It is characterized by being composed of and.
【０００９】[0009]
【作用】前記のように本発明に係る内燃機関の点火装置
を構成したので、燃料弁の噴孔２から噴射された燃料噴
霧１２は点火栓外側カバー５に衝突し、該点火栓外側カ
バーの下流側には燃料噴流の循環流れ１６が生じ、その
流速が低下する。その際キャビティ９内より点火栓外側
カバー５の下流側に穿設されたオリフィス１０を介して
同時にキャビティ９内から高温、高圧のガスジェット１
１が流速の低い燃料噴流の循環流れ１６の領域に噴出す
る。このため、図５に示すように点火のために必要なエ
ネルギは少なくてよくなる。Since the ignition device for an internal combustion engine according to the present invention is constructed as described above, the fuel spray 12 injected from the injection hole 2 of the fuel valve collides with the outer cover 5 of the spark plug, and the outer cover of the spark plug is covered. A circulating flow 16 of the fuel jet is generated on the downstream side, and the flow velocity thereof is reduced. At that time, the gas jet 1 of high temperature and high pressure is simultaneously discharged from the inside of the cavity 9 through the orifice 10 formed on the downstream side of the spark plug outer cover 5 from the inside of the cavity 9.
1 is ejected to the region of the circulation flow 16 of the fuel jet having a low flow velocity. Therefore, as shown in FIG. 5, less energy is required for ignition.
【００１０】[0010]
【実施例】以下図１〜２を参照し、本発明の一実施例に
ついて説明する。図１は本発明に係る内燃機関の点火装
置の正面断面図、図２は同平面図である。図１〜２に示
す本発明の実施例は、燃料が燃料弁１から噴射され、そ
れに向って高温、高圧のガスジェット１１が噴出し、燃
料噴霧１２が点火する状況を模式に示したものである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front sectional view of an internal combustion engine ignition device according to the present invention, and FIG. 2 is a plan view thereof. The embodiment of the present invention shown in FIGS. 1 and 2 schematically shows a situation in which fuel is injected from a fuel valve 1, a high temperature and high pressure gas jet 11 is jetted toward the fuel valve, and a fuel spray 12 is ignited. is there.
【００１１】燃料弁１と点火栓４はシリンダヘッドに装
着され、燃料弁１からの燃料が燃料噴霧１２となってピ
ストン１３とシリンダヘッド３とで構成された燃焼室へ
噴射されるように構成されている。点火栓４は図１〜２
に示すようにキャビティ９と、オリフィス１０と、中心
電極７と接地電極６とから構成されると共に、該点火栓
４が燃料噴霧１２に突出して装着され、さらにオリフィ
ス１０が点火栓４に対し燃料噴霧１２の下流側に設置さ
れている。The fuel valve 1 and the spark plug 4 are mounted on a cylinder head so that the fuel from the fuel valve 1 becomes a fuel spray 12 and is injected into a combustion chamber composed of a piston 13 and a cylinder head 3. Has been done. The spark plug 4 is shown in FIGS.
As shown in FIG. 2, the cavity 9, the orifice 10, the center electrode 7 and the ground electrode 6 are provided, and the spark plug 4 is mounted so as to project into the fuel spray 12. It is installed on the downstream side of the spray 12.
【００１２】次に前記実施例の作用について説明する。
図示しない燃料噴射ポンプからの燃料が燃料弁１に供給
され、噴孔２から燃料が噴射され、燃料噴霧１２を形成
する。該燃料噴霧は点火栓外側カバー５に衝突し、点火
栓外側カバー５の燃料噴流下流側に燃料噴流の循環流れ
１６が生じる。Next, the operation of the above embodiment will be described.
Fuel from a fuel injection pump (not shown) is supplied to the fuel valve 1, and fuel is injected from the injection holes 2 to form a fuel spray 12. The fuel spray collides with the spark plug outer cover 5, and a circulating flow 16 of the fuel jet is generated on the downstream side of the fuel spray flow of the spark plug outer cover 5.
【００１３】燃料の噴射開始より運転条件にマッチした
タイミングで図示しない点火回路から中心電極７へ高電
圧が印加され、該中心電極７と接地電圧６との間隙に絶
縁破壊を起し火花放電８が発生する。該火花放電が発生
後暫くの間図示しない点火回路から電気エネルギが供給
され火花放電８が持続されるため、キャビティ９内のガ
スが高温、高圧となる。A high voltage is applied to the center electrode 7 from an ignition circuit (not shown) from the start of fuel injection at a timing that matches the operating conditions, causing dielectric breakdown in the gap between the center electrode 7 and the ground voltage 6 and spark discharge 8 Occurs. Electric energy is supplied from an ignition circuit (not shown) for a while after the spark discharge is generated and the spark discharge 8 is maintained, so that the gas in the cavity 9 becomes high temperature and high pressure.
【００１４】この高温、高圧となったガスがオリフィス
１０から高圧ジェット１１となってシリンダ内に噴出す
る。本実施例では従来例と異なり図１に示すように点火
栓外側カバー５の燃料噴流下流側にあけられているの
で、高温、高圧のガスジェット１１は流速の遅い燃料噴
流の循環流れ１６の領域に噴出するため、図５に示すよ
うに点火に必要なエネルギは小さくてよくなり、燃料噴
霧への点火が確実となる。This high-temperature, high-pressure gas becomes a high-pressure jet 11 from the orifice 10 and is ejected into the cylinder. In this embodiment, unlike the conventional example, as shown in FIG. 1, since the spark plug outer cover 5 is opened on the downstream side of the fuel jet, the high-temperature, high-pressure gas jet 11 is in the region of the circulation flow 16 of the fuel jet having a slow flow velocity. As shown in FIG. 5, the amount of energy required for ignition is small, and the fuel spray is surely ignited.
【００１５】[0015]
【発明の効果】本発明によれば低い点火エネルギで確実
に燃料噴流への点火が可能となり、点火不良による機関
性能の低下、未燃燃料の排出が防止でき、放電エネルギ
が小さくてよいため、点火栓、点火回路の耐久性の向上
と機関の総合効率が実現できる。According to the present invention, it is possible to reliably ignite a fuel jet with low ignition energy, prevent deterioration of engine performance due to poor ignition, discharge of unburned fuel, and small discharge energy. It is possible to improve the durability of the spark plug and the ignition circuit and realize the overall efficiency of the engine.
【図１】本発明に係る内燃機関の点火装置の正面断面
図、FIG. 1 is a front sectional view of an ignition device for an internal combustion engine according to the present invention,
【図２】同平面図、FIG. 2 is a plan view of the same,
【図３】従来例の図１応当図、FIG. 3 is a prior art example of FIG.
【図４】従来例の図２応当図、FIG. 4 is a conventional example shown in FIG.
【図５】燃料噴流流速とこれに点火するために必要なエ
ネルギの関係図。FIG. 5 is a diagram showing the relationship between the fuel jet flow velocity and the energy required to ignite it.
１…燃料弁、２…噴孔、３…シリンダヘッド、４…点火
栓、５…点火栓外側カバー、６…接地電極、７…中心電
極、８…火花放電、９…キャビティ、１０…オリフィ
ス、１１…高温、高圧ガスジェット、１２…燃料噴霧、
１３…ピストン、１４…燃料噴流、１５…燃料噴射方
向、１６…燃料噴流の循環流れ。1 ... Fuel valve, 2 ... Injection hole, 3 ... Cylinder head, 4 ... Spark plug, 5 ... Spark plug outer cover, 6 ... Ground electrode, 7 ... Center electrode, 8 ... Spark discharge, 9 ... Cavity, 10 ... Orifice, 11 ... High temperature, high pressure gas jet, 12 ... Fuel spray,
13 ... Piston, 14 ... Fuel jet, 15 ... Fuel injection direction, 16 ... Circulating flow of fuel jet.
Claims (1)
（４）により着火する内燃機関において、前記点火栓を
燃料噴射方向（１５）と交差し燃料噴流内に突出させて
配置すると共に、前記点火栓がキャビティ（９）と、燃
料噴流下流側に設けられたオリフィス（１０）と、中心
電極（７）と、接地電極（６）とから構成されたことを
特徴とする内燃機関の点火装置。1. In an internal combustion engine in which fuel is directly injected into a cylinder and ignited by a spark plug (4), the spark plug is disposed so as to intersect with a fuel injection direction (15) and project into a fuel jet. An ignition device for an internal combustion engine, characterized in that the spark plug comprises a cavity (9), an orifice (10) provided on the downstream side of the fuel jet, a center electrode (7), and a ground electrode (6). .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33308094A JP3297233B2 (en) | 1994-12-14 | 1994-12-14 | Ignition device for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33308094A JP3297233B2 (en) | 1994-12-14 | 1994-12-14 | Ignition device for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08165975A true JPH08165975A (en) | 1996-06-25 |
| JP3297233B2 JP3297233B2 (en) | 2002-07-02 |
Family
ID=18262051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33308094A Expired - Fee Related JP3297233B2 (en) | 1994-12-14 | 1994-12-14 | Ignition device for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3297233B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0824185A2 (en) | 1996-08-12 | 1998-02-18 | Mazda Motor Corporation | Direct fuel injection spark ignition engine |
| KR100515254B1 (en) * | 1996-08-12 | 2005-11-25 | 마츠다 가부시키가이샤 | Internal injection engine |
| JP2007231839A (en) * | 2006-03-01 | 2007-09-13 | Denso Corp | Combustion engine |
-
1994
- 1994-12-14 JP JP33308094A patent/JP3297233B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0824185A2 (en) | 1996-08-12 | 1998-02-18 | Mazda Motor Corporation | Direct fuel injection spark ignition engine |
| EP0824185A3 (en) * | 1996-08-12 | 1998-05-06 | Mazda Motor Corporation | Direct fuel injection spark ignition engine |
| US6009849A (en) * | 1996-08-12 | 2000-01-04 | Mazda Motor Corporation | Direct fuel injection engine |
| KR100515254B1 (en) * | 1996-08-12 | 2005-11-25 | 마츠다 가부시키가이샤 | Internal injection engine |
| JP2007231839A (en) * | 2006-03-01 | 2007-09-13 | Denso Corp | Combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3297233B2 (en) | 2002-07-02 |
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