JPH06618Y2 - Fuel system for gas-fired diesel engine - Google Patents
Fuel system for gas-fired diesel engineInfo
- Publication number
- JPH06618Y2 JPH06618Y2 JP17958687U JP17958687U JPH06618Y2 JP H06618 Y2 JPH06618 Y2 JP H06618Y2 JP 17958687 U JP17958687 U JP 17958687U JP 17958687 U JP17958687 U JP 17958687U JP H06618 Y2 JPH06618 Y2 JP H06618Y2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- gas fuel
- fuel injection
- fuel
- plunger
- 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
Landscapes
- Fuel-Injection Apparatus (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Description
【考案の詳細な説明】 （産業上の利用分野） 本考案はガス焚きディーゼルエンジンの燃料供給装置に
関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a fuel supply device for a gas fired diesel engine.
（従来の技術） 従来形のガスエンジンとしては、給気管内にガス燃料を
全量供給するか、圧縮始めの初期にシリンダ内にガス燃
料を噴出させ点火前にシリンダ内に全量のガス燃料を供
給するいわゆる予混合燃焼タイプか、あるいは点火時に
全量のガス燃料をシリンダ内に供給する拡散燃焼タイプ
のガスエンジンに２大別できる。このようなガスエンジ
ンに使用される油圧駆動方式のガス燃料噴射弁では、第
５〜７図に示すようにガス燃料の噴射始めから噴射終り
までプランジャリードには連続して噴射するようにして
おり、噴射を一時中止するようなみぞは設けられていな
い。(Prior Art) As a conventional gas engine, the entire amount of gas fuel is supplied into the air supply pipe, or the entire amount of gas fuel is injected into the cylinder before ignition and is injected into the cylinder at the beginning of compression. It can be roughly divided into a so-called premixed combustion type gas engine or a diffusion combustion type gas engine which supplies the entire amount of gas fuel into the cylinder upon ignition. In the hydraulically driven gas fuel injection valve used in such a gas engine, as shown in FIGS. 5 to 7, the fuel is continuously injected into the plunger lead from the beginning to the end of injection. , There is no groove to suspend the injection.
（考案が解決しようとする問題点） ところが予混合燃焼タイプのガスエンジンでは、理論混
合比で燃焼させるとノッキングを起し、最大出力が抑え
られ熱効率を十分増大させることはできない。一方圧縮
上死点の点火時期にガス燃料の全量を供給する拡散燃焼
タイプのガスエンジンでは、圧縮比を十分に高めること
が可能であるため、出力も熱効率も高めることができる
が、拡散燃焼の燃焼領域が理論混合比に近いため、燃焼
ガスの温度が上昇しＮＯXの生成量が多く、公害面では
必ずしも有利ではない。(Problems to be solved by the invention) However, in a premixed combustion type gas engine, when the fuel is burned at a theoretical mixing ratio, knocking occurs, the maximum output is suppressed, and the thermal efficiency cannot be sufficiently increased. On the other hand, in the diffusion combustion type gas engine that supplies the entire amount of gas fuel at the ignition timing of the compression top dead center, the compression ratio can be sufficiently increased, so that the output and the thermal efficiency can be increased. Since the combustion region is close to the theoretical mixing ratio, the temperature of the combustion gas rises and the amount of NO x produced is large, which is not necessarily advantageous in terms of pollution.
本考案の目的は前記従来装置の問題点を解消し、ノッキ
ングも少なくＮＯXの排出も少ない良好な燃焼が確保で
きるガス焚きディーゼルエンジンの燃料供給装置を提供
するにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems of the conventional device and to provide a fuel supply device for a gas-fired diesel engine capable of ensuring good combustion with less knocking and less NO X emission.
（問題点を解決するための手段） 本考案のガス焚きエンジンの燃料供給装置は、ガス燃料
噴射弁の開弁をコントロールするアクチュエータとして
の油圧コントロールポンプのプランジャ形状を第２図に
示すように上端部に逆リードを設けて、ガス燃料噴射量
の増加にともないガス燃料噴射始めが進むようにすると
ともに、ガス燃料の吐出作用をはたしている油圧コント
ロールポンプのプランジャランドの中間部に休止みぞを
設けてガス燃料の噴射を中断し、一定時間後再びガス燃
料を噴射するようにし、且この後期ガス燃料噴射時期を
点火時期と合致させるように構成している。(Means for Solving Problems) A fuel supply device for a gas-fired engine according to the present invention has a plunger shape of a hydraulic control pump as an actuator for controlling opening of a gas fuel injection valve, as shown in FIG. A reverse lead is provided in the section so that the gas fuel injection starts as the amount of gas fuel injection increases, and a pause groove is provided in the middle of the plunger land of the hydraulic control pump that discharges the gas fuel. The injection of the gas fuel is interrupted, the gas fuel is injected again after a fixed time, and the latter gas fuel injection timing matches the ignition timing.
（作用） 本考案によれば一部のガス燃料を点火前にガス燃料噴射
弁よりシリンダ内に供給し予混合の状況としておき、点
火時に残りのガス燃料を全量同一ガス燃料噴射弁より噴
射する拡散燃焼状況にコントロールしたので、全空間が
均一に理論混合比になることがさけられ、燃焼領域が混
合気の希薄な部分と過濃な部分が存在するようにコント
ロールされ、熱効率を十分高めるとともに排気中のＮＯ
Xも少なくすることができる。(Operation) According to the present invention, a part of the gas fuel is supplied from the gas fuel injection valve into the cylinder before ignition to be in the state of premixing, and all the remaining gas fuel is injected from the same gas fuel injection valve at the time of ignition. Since the diffusion combustion condition is controlled, the entire space is prevented from becoming a theoretical mixing ratio evenly, and the combustion region is controlled so that there are a lean portion and a rich portion of the air-fuel mixture, and the thermal efficiency is sufficiently increased. NO in the exhaust
X can also be reduced.
（実施例） 以下第１〜４図を参照し本考案の一実施例について説明
する。(Embodiment) An embodiment of the present invention will be described below with reference to FIGS.
第１図はセタン価が高く圧縮着火性のよい燃料を吐出す
る点火用のパイロット燃料噴射弁１と主燃料であるガス
燃料を供給するガス燃料噴射弁２を独立にシリンダカバ
ー１０にそなえたガス焚きディーゼルエンジンを示して
いる。３はパイロット燃料噴射弁１へ高圧油を供給する
パイロット燃料噴射ポンプ、４はガス燃料噴射弁２を駆
動するアクチュエータとしての油圧コントロールポン
プ、５は高セタン価油の燃料タンク、６は高圧ガス燃料
ボンベ、７はアクチュエータ用の作動油タンク、８はパ
イロット燃料油の噴射ポンプ３及びガス燃料噴射弁２の
アクチュエータポンプ４を制御するコントローラ、９は
ピストン、１０はシリンダカバー、１１はシリンダライ
ナ、１２は排気弁を示す。FIG. 1 shows a gas in which a pilot fuel injection valve 1 for ignition that discharges a fuel having a high cetane number and good compression ignitability and a gas fuel injection valve 2 that supplies a gas fuel that is a main fuel are independently provided in a cylinder cover 10. Shows a diesel engine. 3 is a pilot fuel injection pump for supplying high pressure oil to the pilot fuel injection valve 1, 4 is a hydraulic control pump as an actuator for driving the gas fuel injection valve 2, 5 is a fuel tank of high cetane number oil, and 6 is high pressure gas fuel A cylinder, 7 is a hydraulic oil tank for an actuator, 8 is a controller which controls the pilot fuel oil injection pump 3 and the actuator pump 4 of the gas fuel injection valve 2, 9 is a piston, 10 is a cylinder cover, 11 is a cylinder liner, and 12 Indicates an exhaust valve.
第２図は本考案の主要部であるガス燃料弁２を駆動する
油圧ポンプのプランジャリードの正面図を示している。
４０１，４０１′はプランジャランドで該ランドで給排
油孔４０５を閉じているときには作動油が吐出される。
４０２は傾斜したプランジャ上端部を示し、４０３は油
圧圧送休止期間となるリードみぞであり、４０４はプラ
ンジャランドの下端で作動油の吐出が終了する位置を示
している。FIG. 2 shows a front view of a plunger lead of a hydraulic pump which drives a gas fuel valve 2 which is a main part of the present invention.
Reference numerals 401 and 401 'denote plunger lands, from which hydraulic oil is discharged when the oil supply / drain holes 405 are closed.
Reference numeral 402 denotes an inclined upper end portion of the plunger, 403 is a lead groove during a hydraulic pressure feed suspension period, and 404 is a position at the lower end of the plunger land where the discharge of the hydraulic oil ends.
次に前記実施例の作用について説明する。Next, the operation of the above embodiment will be described.
上記のような構成のガス燃料弁駆動用油圧コントロール
ポンプ４を用いると、ガス噴射始めとガス噴射終りの中
間において、一時期プランジャリードみぞ４０３により
油の吐出が中断され、油圧がゼロとなりガス燃料弁２の
針弁が一時的に閉鎖されるので、第３図に示すようにガ
ス噴射時期を前期と後期に分離することができ、予混合
燃焼と拡散燃焼がミックスされた燃焼タイプとなり、熱
効率が高く排気中のNOXも少ない良好なガス焚きディー
ゼルエンジンが実現できる。When the gas fuel valve driving hydraulic control pump 4 having the above-described configuration is used, the discharge of oil is interrupted by the plunger lead groove 403 for a period of time between the start of gas injection and the end of gas injection, and the hydraulic pressure becomes zero and the gas fuel valve Since the second needle valve is temporarily closed, the gas injection timing can be separated into the first and second halves as shown in FIG. 3, and the combustion type is a mixture of premixed combustion and diffusion combustion, and the thermal efficiency is improved. It is possible to realize a good gas-fired diesel engine that is high and emits little NO X.
（考案の効果） 本考案は前記のとおり、ガス噴射期間を前期と後期に分
離することが可能となり、後期のガス噴射時期をほぼ上
死点付近の点火時期（本実施例では点火パイロット燃料
油噴射時期）と同一タイミングになるように調整してい
るので、第４図に示すように点火燃焼時期は前記に噴射
したガス燃料は予混合気化し、後期に噴射したガスはガ
スジェットとなり、燃焼は予混合炎と拡散炎の混合した
燃焼状態となり、ノッキングもなくNOXの排出も少ない
良好な燃焼が確保される。(Effect of the Invention) As described above, the present invention makes it possible to separate the gas injection period into the first period and the second period, and the gas injection timing in the latter period is almost near the top dead center (in this embodiment, the ignition pilot fuel oil is used). Since it is adjusted so that it becomes the same timing as the injection timing), as shown in FIG. 4, at the ignition combustion timing, the gas fuel injected above is premixed gasification, and the gas injected in the latter period becomes a gas jet, Results in a combustion state in which a premixed flame and a diffusion flame are mixed, and good combustion is ensured with no knocking and NO X emissions.
第１〜４図は本考案に係わるもので、第１図は本考案の
ガス弁駆動油圧ポンプをそなえたガスエンジンのブロッ
ク図、第２図はガス弁駆動油圧ポンプのプランジャ正面
図、第３図は同作動説明図、第４図はシリンダ内での燃
焼状況図、第５〜７図は従来例に係わるもので、第５図
は第１図応当図、第６図は第２図応当図、第７図はガス
燃料弁油圧駆動系を示している。 １…パイロット燃料油弁、２…ガス燃料噴射弁、４…油
圧コントロールポンプ、４０２…逆リードのプランジャ
上端部、４０３…吐出休止みぞ、４０１…前期吐出プラ
ンジャランド、４０１′…後期吐出プランジャランド。1 to 4 relate to the present invention, FIG. 1 is a block diagram of a gas engine equipped with the gas valve driven hydraulic pump of the present invention, FIG. 2 is a front view of a plunger of the gas valve driven hydraulic pump, and FIG. FIG. 4 is a diagram for explaining the same operation, FIG. 4 is a combustion state diagram in a cylinder, FIGS. 5 to 7 are related to a conventional example, FIG. 5 is a corresponding diagram of FIG. 1, and FIG. 6 is a corresponding diagram of FIG. FIG. 7 shows a gas fuel valve hydraulic drive system. 1 ... Pilot fuel oil valve, 2 ... Gas fuel injection valve, 4 ... Hydraulic control pump, 402 ... Reverse lead plunger upper end, 403 ... Discharge pause groove, 401 ... Early discharge plunger land, 401 '... Late discharge plunger land.
Claims (1)
ロールするガスエンジンにおいて、ガス燃料供給装置に
使用されるアクチュエータとしての油圧コントロールポ
ンプのプランジャリードの切り欠き上端部にガス燃料噴
射始めがガス燃料噴射量の増加にともない進むように逆
リードを設けるとともに、ガス燃料の噴射を中断する休
止みぞを設け、一定時間後再びガス燃料を噴射するプラ
ンジャランドを設け、かつこの後期噴射時期を点火時期
と合致するよう構成したガス焚きディーゼルエンジンの
燃料供給装置。1. In a gas engine for controlling the opening of a gas fuel injection valve by hydraulic pressure, a gas fuel injection starts at the upper end of a notch of a plunger lead of a hydraulic control pump as an actuator used in a gas fuel supply device. A reverse lead is provided so that the fuel injection amount can be increased, a pause groove for interrupting the gas fuel injection is provided, a plunger land for injecting the gas fuel again after a certain time is provided, and the latter injection timing is the ignition timing. A fuel supply device for a gas-fired diesel engine configured to match with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17958687U JPH06618Y2 (en) | 1987-11-27 | 1987-11-27 | Fuel system for gas-fired diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17958687U JPH06618Y2 (en) | 1987-11-27 | 1987-11-27 | Fuel system for gas-fired diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0185453U JPH0185453U (en) | 1989-06-06 |
| JPH06618Y2 true JPH06618Y2 (en) | 1994-01-05 |
Family
ID=31471133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17958687U Expired - Lifetime JPH06618Y2 (en) | 1987-11-27 | 1987-11-27 | Fuel system for gas-fired diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06618Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104126061A (en) * | 2012-04-11 | 2014-10-29 | 三菱重工业株式会社 | 2-cycle gas engine |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5765819B2 (en) * | 2012-04-11 | 2015-08-19 | 三菱重工業株式会社 | 2-cycle gas engine |
| JP5925104B2 (en) * | 2012-10-19 | 2016-05-25 | 三菱重工業株式会社 | Fuel gas injection valve, dual fuel gas engine, and fuel gas injection valve injection method |
| DK178962B1 (en) * | 2013-10-23 | 2017-07-03 | Man Diesel & Turbo Filial Af Man Diesel & Turbo Se Tyskland | A self-igniting internal combustion engine having a gaseous fuel supply system with pilot oil injection |
| JP2015190328A (en) * | 2014-03-27 | 2015-11-02 | 三井造船株式会社 | Fuel injection system of gas injection engine |
| JP6561362B2 (en) * | 2014-10-29 | 2019-08-21 | 株式会社三井Ｅ＆Ｓマシナリー | Ship engine operation system |
| JP2016006325A (en) * | 2015-08-03 | 2016-01-14 | 三菱重工業株式会社 | Two-cycle gas engine and fuel gas injection system for two-cycle gas engine |
-
1987
- 1987-11-27 JP JP17958687U patent/JPH06618Y2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104126061A (en) * | 2012-04-11 | 2014-10-29 | 三菱重工业株式会社 | 2-cycle gas engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0185453U (en) | 1989-06-06 |
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