JP3289133B2 - Method for improving fuel ignitability in intake pipe fuel injection compression ignition engine - Google Patents
Method for improving fuel ignitability in intake pipe fuel injection compression ignition engineInfo
- Publication number
- JP3289133B2 JP3289133B2 JP00816397A JP816397A JP3289133B2 JP 3289133 B2 JP3289133 B2 JP 3289133B2 JP 00816397 A JP00816397 A JP 00816397A JP 816397 A JP816397 A JP 816397A JP 3289133 B2 JP3289133 B2 JP 3289133B2
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- ozone
- ignitability
- intake pipe
- fuel injection
- 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
-
- 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)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、吸気管燃料噴射圧
縮着火エンジンにおいて着火困難な燃料を使った場合に
おける着火性を改善するための低セタン価燃料の着火性
改善方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for improving the ignitability of a low cetane number fuel for improving the ignitability of a fuel which is difficult to ignite in an intake pipe fuel injection compression ignition engine.
【０００２】[0002]
【従来の技術】一般に、軽油等を用いる圧縮着火エンジ
ン（ディーゼルエンジン）は、高圧縮比による燃料節減
をもたらすことから、広く実用化が図られている。これ
らの圧縮着火エンジンでは、圧縮行程の終期の空気温度
は、十分に軽油等を着火させることができる程度に高温
になるが、メタン、ＬＰＧ、アルコールあるいはガソリ
ン等の低セタン価燃料では、着火温度が軽油のそれに比
べて高く、着火困難が生じ、エンジンを運転することが
できない。2. Description of the Related Art In general, a compression ignition engine (diesel engine) using light oil or the like has been widely put into practical use because it can save fuel by a high compression ratio. In these compression ignition engines, the air temperature at the end of the compression stroke is high enough to ignite light oil etc., but the ignition temperature is low for low cetane number fuels such as methane, LPG, alcohol or gasoline. However, it is higher than that of light oil, and ignition difficulties occur, and the engine cannot be operated.
【０００３】[0003]
【発明が解決しようとする課題】本発明の技術的課題
は、吸込行程で吸込口に燃料を噴射する吸気管燃料噴射
圧縮着火エンジンにおいて、着火が困難な低セタン価燃
料を用いた場合における着火性を改善するための簡単で
安価な手段を提供することにある。SUMMARY OF THE INVENTION A technical problem of the present invention is to provide ignition in a fuel injection compression ignition engine, in which fuel is difficult to ignite, in an intake pipe fuel injection compression engine in which fuel is injected into an intake port during a suction stroke. It is to provide a simple and inexpensive means for improving the performance.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決するため
の本発明の燃料の着火性改善方法は、吸込行程でシリン
ダの吸込口に燃料を噴射する吸気管燃料噴射圧縮着火エ
ンジンにおいて、上記燃料の噴射にタイミングを合わせ
て、その噴射燃料中にオゾン発生器で発生させたオゾン
を混入させることにより、圧縮行程の終期におけるシリ
ンダ内の高温の噴射燃料中にオゾン濃度が高い部分を生
成させ、このオゾンの化学的活性に基づいて低セタン価
燃料の着火性を改善することを特徴とするものである。
上記方法においては、オゾン発生器の動作時間の制御に
より、噴射燃料に対するオゾンの混入量を燃料の着火性
に応じて調整することができる。According to the present invention, there is provided a method for improving the ignitability of a fuel according to the present invention, wherein the fuel is injected into a suction port of a cylinder during a suction stroke. By mixing the ozone generated by the ozone generator into the injected fuel at the same timing as the injection, a portion having a high ozone concentration is generated in the high-temperature injected fuel in the cylinder at the end of the compression stroke, It is characterized by improving the ignitability of a low cetane fuel based on the chemical activity of ozone.
In the above method, by controlling the operation time of the ozone generator, the amount of ozone mixed into the injected fuel can be adjusted according to the ignitability of the fuel.
【０００５】このような本発明の着火性改善方法におい
ては、圧縮着火エンジンの吸気弁が開いた吸込行程にお
いて、吸気管内を通して給気される空気中に燃料噴射弁
から燃料を噴射するとき、その燃料噴射にタイミングを
合わせてオゾン発生器を動作させ、その噴射燃料中にオ
ゾンを混入させる。このオゾンの混入量は、使用する燃
料の着火性に応じて、オゾン発生器の動作時間の制御に
より、燃料の着火性に応じて調整することができる。In such a method for improving ignitability of the present invention, when fuel is injected from a fuel injection valve into air supplied through an intake pipe in a suction stroke in which an intake valve of a compression ignition engine is opened. The ozone generator is operated in time with the fuel injection, and ozone is mixed into the injected fuel. The mixing amount of ozone can be adjusted according to the ignitability of the fuel by controlling the operation time of the ozone generator in accordance with the ignitability of the fuel used.
【０００６】上記噴射燃料に対するオゾンの混入によ
り、圧縮行程の終期においては、シリンダ内の高温の燃
料・空気混合気中に、高濃度の噴射燃料中でオゾン濃度
が高くなっているオゾン添加混合気の部分が生成され、
上記圧縮行程における混合気の昇温及びこの添加オゾン
の化学的活性により、噴射燃料が、例えば、メタン、Ｌ
ＰＧ、アルコール、あるいはガソリン等の低セタン価燃
料であっても、その着火性を改善し、確実に着火させる
ことができる。なお、上記燃料の着火性改善方法は、２
サイクルまたは４サイクルの吸気管燃料噴射圧縮着火エ
ンジンに適用できるのは勿論である。At the end of the compression stroke, due to the mixing of ozone with the injected fuel, the ozone-added mixture having a high ozone concentration in the high-concentration injected fuel is contained in the high-temperature fuel-air mixture in the cylinder. Is generated,
Due to the temperature rise of the air-fuel mixture during the compression stroke and the chemical activity of the added ozone, the injected fuel is, for example, methane, L
Even with a low cetane fuel such as PG, alcohol, or gasoline, the ignitability can be improved and the fuel can be reliably ignited. The method for improving the ignitability of the fuel is described in 2
Needless to say, the present invention can be applied to a four-cycle or four-cycle intake pipe fuel injection compression ignition engine.
【０００７】[0007]
【発明の実施の形態】図１及び図２は、本発明の実施の
一形態を説明するためのもので、図１は、本発明を適用
した吸気管燃料噴射圧縮着火エンジンにおける吸込行程
の燃料噴射状態を、図２は、同圧縮行程の終期の状態を
示している。図示した吸気管燃料噴射圧縮着火エンジン
は、シリンダ１の上部に吸込口（吸込弁口）２及び排出
口（排気弁口）３をもつシリンダヘッドを備え、吸込口
２には吸気管４が、排出口３には排気管５がそれぞれ連
結され、また、吸込口２及び排出口３には、それらを開
閉する吸気弁６及び排気弁７がそれぞれ設けられてい
る。1 and 2 are views for explaining an embodiment of the present invention. FIG. 1 shows a fuel in a suction stroke of an intake pipe fuel injection compression ignition engine to which the present invention is applied. FIG. 2 shows the injection state at the end of the compression stroke. The illustrated intake pipe fuel injection compression ignition engine includes a cylinder head having a suction port (suction valve port) 2 and a discharge port (exhaust valve port) 3 at an upper portion of a cylinder 1, and an intake pipe 4 at the suction port 2. An exhaust pipe 5 is connected to the outlet 3, and an intake valve 6 and an exhaust valve 7 that open and close the inlet and the outlet 3 are provided respectively.
【０００８】そして、吸気弁６に近い吸気管４内には、
その吸気管４内に燃料を噴射する燃料噴射弁８の噴出口
を開口させると共に、その燃料噴射弁８からの燃料の噴
射流中にオゾンを混入させるオゾン発生器９を配置して
いる。また、シリンダ１内を上下動するピストン１０に
より、シリンダ１内に燃焼室を区画形成し、その上面に
は、燃焼室１１の一部を構成する凹部１２が形成されて
いる。上記オゾン発生器９としては、空気中の酸素を高
電圧の印加による放電でオゾンに転化する既知の装置ば
かりでなく、任意の装置を用いることができ、また、こ
のオゾン発生器９の動作時間、即ち、高電圧の印加時間
を燃料の着火性に応じて任意に制御可能とし、それによ
り噴射燃料に対するオゾンの混入量を調整することがで
きる。In the intake pipe 4 near the intake valve 6,
An outlet of a fuel injection valve 8 that injects fuel into the intake pipe 4 is opened, and an ozone generator 9 that mixes ozone into a fuel injection flow from the fuel injection valve 8 is arranged. A combustion chamber is defined in the cylinder 1 by a piston 10 that moves up and down in the cylinder 1, and a concave portion 12 that forms a part of the combustion chamber 11 is formed on the upper surface thereof. As the ozone generator 9, not only a known device for converting oxygen in the air to ozone by discharge by applying a high voltage but also any device can be used. That is, the application time of the high voltage can be arbitrarily controlled in accordance with the ignitability of the fuel, whereby the amount of ozone mixed into the injected fuel can be adjusted.
【０００９】上記燃料噴射弁８は、吸込行程でシリンダ
１の吸込口２に向かって燃料を噴射するように、その噴
出口を上記吸込口２に向けて配設し、オゾン発生器９
は、その燃料噴射弁８からの噴射燃料で、圧縮行程の終
期に燃焼室１１内の高温の噴射燃料中に生成される燃料
濃度の高い部分においてオゾン濃度が高くなるように、
適切な位置に配設される。図中において、１３は燃料・
空気混合気を、１４はオゾン添加混合気を示している。[0009] The fuel injection valve 8 has an injection port directed toward the suction port 2 so as to inject fuel toward the suction port 2 of the cylinder 1 during a suction stroke.
Is such that the ozone concentration is high in a portion of the fuel injected from the fuel injection valve 8 which has a high fuel concentration generated in the high-temperature injected fuel in the combustion chamber 11 at the end of the compression stroke.
It is arranged in an appropriate position. In the figure, 13 is fuel /
Reference numeral 14 denotes an air-fuel mixture, and 14 denotes an ozone-added air-fuel mixture.
【００１０】上記構成を有する吸気管燃料噴射圧縮着火
エンジンは、図１に示すような吸込行程において、シリ
ンダ１の吸込口２に燃料噴射弁８から燃料が噴射され、
この燃料の噴射にタイミングを合わせて、その噴射燃料
（燃料・空気混合気１３）中に、オゾン発生器９で発生
させたオゾンを混入させる。これにより、図１中に示す
ように、燃料とオゾンがよく混合したオゾン添加混合気
１４が形成されて、周囲の吸込空気とともに吸込口２を
通してシリンダ１内に流入する。その結果、図２に示す
ように、圧縮行程の終期におけるシリンダ１内の高温の
燃料・空気混合気１３中に、オゾン濃度が高いオゾン添
加混合気１４が生成される。In the intake pipe fuel injection compression ignition engine having the above configuration, fuel is injected from the fuel injection valve 8 into the suction port 2 of the cylinder 1 during a suction stroke as shown in FIG.
Ozone generated by the ozone generator 9 is mixed into the injected fuel (fuel / air mixture 13) in synchronization with the fuel injection. Thereby, as shown in FIG. 1, an ozone-added mixture 14 in which fuel and ozone are well mixed is formed, and flows into the cylinder 1 through the suction port 2 together with the surrounding suction air. As a result, as shown in FIG. 2, an ozone-added mixture 14 having a high ozone concentration is generated in the high-temperature fuel-air mixture 13 in the cylinder 1 at the end of the compression stroke.
【００１１】このオゾンは、化学的活性が強い物質であ
り、その化学的活性に基づいて、燃料がメタン、ＬＰ
Ｇ、アルコールあるいはガソリン等の低セタン価燃料で
あっても、その着火が促進され、それに伴う着火性の改
善により円滑にエンジンを運転することができる。即
ち、上記圧縮行程の進行に伴い、燃焼室１１内のオゾン
添加混合気１４は周囲の燃料・空気混合気１３と共に圧
縮されて温度が上昇し、オゾンの化学的活性により着火
し易くなり、燃焼期においては、火炎の伝播の速度が大
きくなる。This ozone is a substance having a strong chemical activity, and the fuel is methane, LP based on the chemical activity.
Even with a low cetane number fuel such as G, alcohol, or gasoline, the ignition is promoted, and the resulting improvement in the ignitability allows the engine to operate smoothly. That is, with the progress of the compression stroke, the ozone-added air-fuel mixture 14 in the combustion chamber 11 is compressed together with the surrounding fuel-air air-fuel mixture 13 and the temperature rises, and the ozone is easily ignited by the chemical activity of ozone, and the combustion is facilitated. During the period, the speed of flame propagation increases.
【００１２】オゾン発生器９の動作時間は、燃料噴射弁
８からの燃料噴射量や、燃料の着火性（セタン価）等に
よりに応じて制御することができ、これにより、噴射燃
料に対するオゾンの混入量を燃料の着火性等に応じて調
整することができる。The operation time of the ozone generator 9 can be controlled in accordance with the amount of fuel injected from the fuel injection valve 8, the ignitability of the fuel (cetane number), and the like. The mixing amount can be adjusted according to the ignitability of the fuel and the like.
【００１３】上述した燃料の着火性改善方法は、濃度の
薄い混合気で燃焼させることによりＮＯX の発生が低減
できるリーンバーンに対して適用するのが有効である。
この場合には、特に、高濃度の噴射燃料中でオゾン濃度
が高くなっているオゾン添加混合気１４の部分が強い着
火点となるので、全体的に燃料の濃度が薄くても、それ
らの燃料を十分に燃焼させることが可能になる。[0013] ignitability improvement method for a fuel described above, it is effective to apply to a lean-burn can be reduced occurrence of the NO X is by burning with a thin mixture density.
In this case, in particular, the portion of the ozone-added mixture 14 where the ozone concentration is high in the high-concentration injected fuel becomes a strong ignition point. It is possible to sufficiently burn.
【００１４】なお、図１では、オゾン発生器９を吸気管
４の内部に配置しているが、それを吸気管４の外部に配
置し、オゾン放出部は吸気弁６に近い吸気管４内に配置
することもできる。In FIG. 1, the ozone generator 9 is arranged inside the intake pipe 4, but it is arranged outside the intake pipe 4, and the ozone emitting portion is located inside the intake pipe 4 near the intake valve 6. Can also be placed.
【００１５】[0015]
【発明の効果】以上に説明したように、本発明の着火性
改善方法によれば、吸込行程で吸込口に燃料を噴射する
吸気管燃料噴射圧縮着火エンジンにおいて、燃料の噴射
にタイミングを合わせてその噴射燃料中にオゾンを混入
させ、圧縮行程の終期におけるシリンダ内の高温の噴射
燃料中にオゾン濃度が高い部分を生成させ、その部分に
おいて着火、燃焼させるので、低セタン価燃料を用いて
も、オゾンの化学的活性に基づいてその着火性を改善す
ることができ、しかも、そのための装置を簡単で安価な
ものとして得ることができる。As described above, according to the method for improving ignitability of the present invention, in an intake pipe fuel injection compression ignition engine that injects fuel into an intake port in a suction stroke, the timing of fuel injection is adjusted. Ozone is mixed into the injected fuel, a high ozone concentration portion is generated in the high-temperature injected fuel in the cylinder at the end of the compression stroke, and the portion is ignited and burned. The ignitability can be improved on the basis of the chemical activity of ozone, and a device for that can be obtained as a simple and inexpensive device.
【図１】本発明を適用した吸気管燃料噴射圧縮着火エン
ジンにおける吸込行程の燃料噴射状態を示す説明図であ
る。FIG. 1 is an explanatory diagram showing a fuel injection state in a suction stroke in an intake pipe fuel injection compression ignition engine to which the present invention is applied.
【図２】同圧縮行程の終期の状態を示す説明図である。FIG. 2 is an explanatory diagram showing a state at the end of the compression stroke.
１ シリンダ ２ 吸込口 ３ 排出口 ４ 吸気管 ５ 排気管 ６ 吸気弁 ７ 排気弁 ８ 燃料噴射弁 ９ オゾン発生器 １０ ピストン １１ 燃焼室 １２ 凹部 １３ 燃料・空気混合気 １４ オゾン添加混合気 DESCRIPTION OF SYMBOLS 1 Cylinder 2 Inlet 3 Outlet 4 Intake pipe 5 Exhaust pipe 6 Intake valve 7 Exhaust valve 8 Fuel injection valve 9 Ozone generator 10 Piston 11 Combustion chamber 12 Depression 13 Fuel / air mixture 14 Ozone-added mixture
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−191858（ＪＰ，Ａ) 特開 昭51−10222（ＪＰ，Ａ) 特開 昭51−1813（ＪＰ，Ａ) 特開 平７−247872（ＪＰ，Ａ) 実開 昭56−163718（ＪＰ，Ｕ) 実開 平３−8646（ＪＰ，Ｕ) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-191858 (JP, A) JP-A-51-10222 (JP, A) JP-A-51-1813 (JP, A) JP-A-7-197 247872 (JP, A) Japanese Utility Model Showa 56-163718 (JP, U) Japanese Utility Model Application Hei 3-8646 (JP, U)
Claims (2)
する吸気管燃料噴射圧縮着火エンジンにおいて、 上記燃料の噴射にタイミングを合わせて、その噴射燃料
中にオゾン発生器で発生させたオゾンを混入させること
により、圧縮行程の終期におけるシリンダ内の高温の噴
射燃料中にオゾン濃度が高い部分を生成させ、 このオゾンの化学的活性に基づいて低セタン価燃料の着
火性を改善する、 ことを特徴とする吸気管燃料噴射圧縮着火エンジンにお
ける燃料の着火性改善方法。1. An intake pipe fuel injection compression ignition engine for injecting fuel into an intake port of a cylinder during a suction stroke, wherein ozone generated by an ozone generator is injected into the injected fuel in time with the fuel injection. By mixing, a high ozone concentration portion is generated in the high-temperature injected fuel in the cylinder at the end of the compression stroke, and the ignitability of the low cetane number fuel is improved based on the chemical activity of the ozone. A method of improving fuel ignitability in an intake pipe fuel injection compression ignition engine.
射燃料に対するオゾンの混入量を燃料の着火性に応じて
調整することを特徴とする請求項１に記載の吸気管燃料
噴射圧縮着火エンジンにおける燃料の着火性改善方法。2. An intake pipe fuel injection compression ignition engine according to claim 1, wherein the amount of ozone mixed into the injected fuel is adjusted according to the ignitability of the fuel by controlling the operation time of the ozone generator. For improving the ignitability of fuel in the United States.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00816397A JP3289133B2 (en) | 1997-01-21 | 1997-01-21 | Method for improving fuel ignitability in intake pipe fuel injection compression ignition engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00816397A JP3289133B2 (en) | 1997-01-21 | 1997-01-21 | Method for improving fuel ignitability in intake pipe fuel injection compression ignition engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10205397A JPH10205397A (en) | 1998-08-04 |
| JP3289133B2 true JP3289133B2 (en) | 2002-06-04 |
Family
ID=11685673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00816397A Expired - Lifetime JP3289133B2 (en) | 1997-01-21 | 1997-01-21 | Method for improving fuel ignitability in intake pipe fuel injection compression ignition engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3289133B2 (en) |
Cited By (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6305363B1 (en) * | 2000-04-17 | 2001-10-23 | General Motors Corporation | Air-assisted fuel injector with ozone enrichment |
| JP2011157940A (en) * | 2010-02-03 | 2011-08-18 | Honda Motor Co Ltd | Compression ignition internal combustion engine |
| JP6268864B2 (en) * | 2013-09-25 | 2018-01-31 | マツダ株式会社 | Control device for compression ignition engine |
| JP6237329B2 (en) * | 2014-02-26 | 2017-11-29 | マツダ株式会社 | Direct injection gasoline engine |
-
1997
- 1997-01-21 JP JP00816397A patent/JP3289133B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9824856B2 (en) | 2014-12-03 | 2017-11-21 | Jeol Ltd. | Deposition method and focused ion beam system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10205397A (en) | 1998-08-04 |
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