JPH0811945B2 - Fuel and water injection method and injection device for water injection diesel engine - Google Patents
Fuel and water injection method and injection device for water injection diesel engineInfo
- Publication number
- JPH0811945B2 JPH0811945B2 JP2302492A JP30249290A JPH0811945B2 JP H0811945 B2 JPH0811945 B2 JP H0811945B2 JP 2302492 A JP2302492 A JP 2302492A JP 30249290 A JP30249290 A JP 30249290A JP H0811945 B2 JPH0811945 B2 JP H0811945B2
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- water
- injection
- valve
- supply passage
- 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 - Fee Related
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
- 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
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は水噴射ディーゼルエンジンに関する。TECHNICAL FIELD The present invention relates to a water injection diesel engine.
ディーゼルエンジンの排ガス中の窒素酸化物（NOX）
を低減し、かつ、エンジンの排気黒煙や燃料消費率の低
減をも同時に達成する手段として、第10〜12図に示すよ
うな、燃料および水を同一の燃料噴射弁から噴射できる
ようにした水噴射ディーゼルエンジンが、従来提案され
ている。Nitrogen oxides (NO x ) in the exhaust gas of diesel engines
As a means of simultaneously reducing the engine exhaust black smoke and reducing the fuel consumption rate, fuel and water can be injected from the same fuel injection valve as shown in Figs. 10 to 12. Water injection diesel engines have been previously proposed.
図において、１は燃料タンク、２は燃料給油ポンプ、
３は燃料噴射ポンプ本体、４は同プランジャ、５はプラ
ンジャバレル、６は吐出弁、７は該吐出弁６の側路に設
けられた逆止調圧弁、８は燃料噴射管、40は燃料噴射弁
で、９は同本体、10は噴孔、11は針弁、12は油溜部、14
は針弁11の付勢ばねである。In the figure, 1 is a fuel tank, 2 is a fuel refueling pump,
3 is a fuel injection pump main body, 4 is the same plunger, 5 is a plunger barrel, 6 is a discharge valve, 7 is a check pressure regulating valve provided in a side passage of the discharge valve 6, 8 is a fuel injection pipe, and 40 is fuel injection. A valve, 9 is the same body, 10 is a nozzle hole, 11 is a needle valve, 12 is an oil reservoir, 14
Is a biasing spring of the needle valve 11.
一方、19は水タンク、18は水供給ポンプ、17は水供給
管、16は水供給制御弁、15は水供給管、13は水供給の逆
止弁で水供給制御弁16側への逆流を防止する。また、20
は水の供給量および供給時期を制御するコントロール装
置で、エンジンのクランク角信号およびその他のエンジ
ン作動条件を入力して、制御弁16に開閉信号を回線23を
介して出力する。On the other hand, 19 is a water tank, 18 is a water supply pump, 17 is a water supply pipe, 16 is a water supply control valve, 15 is a water supply pipe, 13 is a water supply check valve, and a reverse flow to the water supply control valve 16 side. Prevent. Also, 20
Is a control device for controlling the amount and timing of water supply, which inputs a crank angle signal of the engine and other engine operating conditions, and outputs an opening / closing signal to the control valve 16 via a line 23.
燃料噴射弁40の本体９には燃料通路22が穿孔されてお
り、燃料噴射管８および燃料・水噴射弁油溜部12とを連
通させている。また水供給の逆止弁13は、同じく燃料噴
射弁40の本体に穿孔された水通路30を介して上部燃料通
路22の途中の合流部31に接続されている。A fuel passage 22 is bored in the main body 9 of the fuel injection valve 40 to connect the fuel injection pipe 8 and the fuel / water injection valve oil reservoir 12 to each other. The water supply check valve 13 is also connected to a confluence portion 31 in the middle of the upper fuel passage 22 via a water passage 30 that is also formed in the body of the fuel injection valve 40.
次に前記従来例の作用について説明する。 Next, the operation of the conventional example will be described.
水タンク19より水供給ポンプ18によって圧送された水
は、供給管17を通り制御弁16へ送られ、燃料噴射ポンプ
３のプランジャが燃料の圧送を行なっていない休止期間
中に、前記制御弁16はコントローラ装置を介して所定の
期間開弁状態に保持され、所定量の水を供給管15を介し
て燃料・水噴射弁40に送り込む。このとき、前記のとお
り燃料噴射ポンプ３の逆止調整弁７の開弁圧力PRおよび
水供給の逆止弁13の開弁圧をPPとする時、針弁11の開弁
圧POに対して PO＞PR,PO＞PP となっているので、供給された水は逆止弁13をへて水通
路30および合流部31を通り燃料通路22内へ流入する。The water pumped from the water tank 19 by the water supply pump 18 is sent to the control valve 16 through the supply pipe 17, and during the rest period when the plunger of the fuel injection pump 3 is not pumping fuel, the control valve 16 Is kept open for a predetermined period of time via the controller device and sends a predetermined amount of water to the fuel / water injection valve 40 via the supply pipe 15. At this time, when the opening pressure P R and the valve-opening pressure of the check valve 13 of the water supply of the check regulator valve 7 of the fuel injection pump 3 as the a P P, valve opening pressure P O of the needle valve 11 On the other hand, since P O > P R and P O > P P , the supplied water flows into the fuel passage 22 through the check valve 13 and the water passage 30 and the joining portion 31.
燃料通路22内の合流部31より上流側すなわち燃料噴射
ポンプ３側にある燃料は、供給水圧により燃料噴射ポン
プ３の方向に噴射管８を通って押しもどされ、逆止調整
弁７を押し開いてプランジャ室へ逆流する。The fuel on the upstream side of the confluence portion 31 in the fuel passage 22, that is, on the fuel injection pump 3 side is pushed back toward the fuel injection pump 3 by the supply water pressure through the injection pipe 8, and the check valve 7 is pushed open. Back into the plunger chamber.
その結果第11図に示すように燃料噴射弁40内において
は、油溜部12の容積V2および合流部31から油溜部12まで
の燃料通路22の容積V1の和であるV1＋V2の容積には燃料
で満たされ、前記合流部31の上流側の燃料通路22内には
所定量の水が満され、さらにその上流には再び燃料が満
された状態となっている。As a result, in the fuel injection valve 40 as shown in FIG. 11, the sum of the volume V 2 of the oil reservoir 12 and the volume V 1 of the fuel passage 22 from the confluence portion 31 to the oil reservoir 12 is V 1 + V. The volume of 2 is filled with fuel, the fuel passage 22 on the upstream side of the confluence portion 31 is filled with a predetermined amount of water, and the fuel is filled again upstream thereof.
つぎに燃料噴射ポンプ３のプランジャ４が上昇して燃
料の圧縮が開始されと、噴射管８、燃料通路22および油
溜部12内の圧力が上昇し、針弁11の開弁圧PO以上になる
と針弁11が開かれる。このとき逆止弁13の作用により水
通路30内の水は水タンク19側へは押し戻されることはな
い。Next, when the plunger 4 of the fuel injection pump 3 rises to start the compression of fuel, the pressure in the injection pipe 8, the fuel passage 22 and the oil reservoir 12 rises, and the valve opening pressure P O of the needle valve 11 or more is exceeded. Then, the needle valve 11 is opened. At this time, the water in the water passage 30 is not pushed back to the water tank 19 side by the action of the check valve 13.
針弁11が開弁圧POに達すると、第12図の燃料噴射弁40
の噴孔10からは、まず油溜部12および燃料通路22内の合
流部までの容積に満されていたV1＋V2の容積の燃料が噴
射され、続いて所定量供給されていた水が噴射され、最
後に残りの燃料が全量噴射されることとなる。１回の噴
射で噴射される燃料の量をQFとすると、最初に噴射され
る燃料は量QFPは前述のようにQFP＝V1＋V2となり続いて
QWの水の全量が噴射され、最後に残りの燃料QFSとする
とQFS＝QF−QFPが噴射される。When the needle valve 11 reaches the valve opening pressure P O , the fuel injection valve 40 shown in FIG.
First, the fuel of the volume of V 1 + V 2 which had been filled up to the confluence of the oil reservoir 12 and the fuel passage 22 was injected from the injection hole 10 of, and then the water supplied in a predetermined amount was injected. The remaining amount of fuel will be finally injected. Assuming that the amount of fuel injected in one injection is Q F , the amount of fuel injected first is Q FP, which is Q FP = V 1 + V 2 as described above.
The total amount of water of Q W is injected, and finally, the remaining fuel Q FS , Q FS = Q F −Q FP is injected.
その結果QFPの燃料によりディーゼルの燃料行程初期
の着火が確実に行われ、引続きQWの水により噴霧内への
空気の導入が増大され燃料速度が増大および黒煙発生の
低減が行われると同時に水の火炎域への導入によりNOX
の低減が得られる。As a result, the fuel of Q FP ensures the ignition of the diesel in the early stage of the fuel stroke, and the water of Q W continues to increase the introduction of air into the spray to increase the fuel speed and reduce the generation of black smoke. At the same time, NO X is introduced by introducing water into the flame
Is obtained.
ところが、上記従来の技術において、排気中のNOXの
低減効果は水の噴射量QWにほぼ比例して得られるが、燃
料量QFに対してQWが増大し過ぎると、初期のQFPと後期
のQFSの各燃料噴射の時間間隔が開き過ぎることによ
り、燃焼不良を来たし、エンジンの安定した作動が得ら
れなくなる。このため、さらにNOXを低減するために
は、燃焼不足を伴なうことなく、水噴射量QWを増大でき
る手段が必要となる。However, in the above-mentioned conventional technique, the effect of reducing NO X in the exhaust gas is obtained almost in proportion to the water injection amount Q W , but if Q W increases excessively with respect to the fuel amount Q F , the initial Q If the time intervals between the fuel injections of FP and Q FS in the latter period are too wide, combustion failure will occur and stable operation of the engine will not be achieved. Therefore, in order to further reduce NO X , a means that can increase the water injection amount Q W without causing insufficient combustion is required.
本発明の目的は前記従来装置の問題点を解消し、注水
時に水と燃料が多層状に噴射されることにより、水の注
水量を大幅に増大させても、従来のもののように燃焼の
不安定を起すことのない水噴射ディーゼルエンジンを提
供するにある。The object of the present invention is to solve the problems of the above-mentioned conventional device, and by injecting water and fuel in multiple layers at the time of water injection, even if the amount of water injected is greatly increased, there is no combustion failure as in the conventional device. It is to provide a water-injection diesel engine that is stable.
本発明に係る水噴射ディーゼルエンジンにおける燃料
及び水の噴射方法は、燃料と水とを燃焼室に噴射する水
噴射ディーゼルエンジンにおいて、燃料噴射弁の中に燃
料供給路および逆止弁を有する燃料・水供給路を設ける
とともに、燃料・水供給路を燃料供給路に合流させ、燃
料供給路と連通する燃料噴射ポンプが燃料の噴射を休止
している間に、燃料・水供給路へ燃料と水を交互に繰り
返して供給することにより、燃料供給路内に燃料と水が
交互に多層状に積層された液柱を形成させ、その後燃料
噴射ポンプにより燃料を圧送し、液柱の下流側燃料、液
柱を形成する燃料および水、液柱の上流側燃料を燃焼室
に噴射させるように構成したことを特徴とする。A method for injecting fuel and water in a water injection diesel engine according to the present invention is a water injection diesel engine for injecting fuel and water into a combustion chamber, in which a fuel supply valve and a check valve are provided in a fuel injection valve. While the water supply channel is provided, the fuel / water supply channel joins the fuel supply channel, and while the fuel injection pump in communication with the fuel supply channel suspends fuel injection, the fuel / water supply channel By alternately and repeatedly supplying, a liquid column in which fuel and water are alternately laminated in a multi-layered manner is formed in the fuel supply passage, and then the fuel is pumped by the fuel injection pump, the fuel on the downstream side of the liquid column, The fuel and water forming the liquid column and the fuel upstream of the liquid column are configured to be injected into the combustion chamber.
また本発明に係る水噴射ディーゼルエンジンにおける
燃料及び水の噴射装置の第１の特徴は、燃料と水とを燃
焼室に噴射する水噴射ディーゼルエンジンにおいて、燃
料噴射ポンプと連通する燃料供給部と逆止弁を内蔵しか
つ燃料供給路に合流する燃料・水供給路とを有する燃料
噴射弁と、燃料タンクおよび水タンクと別々に連通し燃
料と水を交互に吐出する切返弁装置と、切換弁装置の吐
出口と燃料・水供給路の入口との間に配置される制御弁
と、燃料噴射ポンプが休止している間に制御弁を開動作
させるコントロール装置とを備えてなることにある。The first feature of the fuel and water injection device in the water injection diesel engine according to the present invention is that, in a water injection diesel engine that injects fuel and water into a combustion chamber, it is opposite to a fuel supply unit that communicates with a fuel injection pump. A fuel injection valve having a built-in stop valve and a fuel / water supply passage that joins the fuel supply passage, a switching valve device that communicates with the fuel tank and the water tank separately, and alternately discharges fuel and water A control valve arranged between the discharge port of the valve device and the inlet of the fuel / water supply passage, and a control device for opening the control valve while the fuel injection pump is at rest. .
また第２の特徴は、燃料と水とを燃焼室に噴射する水
噴射ディーゼルエンジンにおいて、燃料噴射ポンプと連
通する燃料供給路と逆止弁を内蔵しかつ燃料供給路に合
流する燃料・水供給路とを有する燃料噴射弁と、燃料タ
ンクと燃料・水供給路の入口との間に配置される第１の
制御弁と水タンクと燃料・水供給路の入口との間に配置
される第２の制御弁と、燃料噴射ポンプが休止している
間に第１の制御弁と第２の制御弁とを交互に繰り返して
開動作させるコントロール装置とを備えてなることにあ
る。A second feature is that in a water injection diesel engine that injects fuel and water into a combustion chamber, a fuel / water supply that has a fuel supply passage communicating with a fuel injection pump and a check valve and joins the fuel supply passage. A fuel injection valve having a passage, a first control valve arranged between the fuel tank and the inlet of the fuel / water supply passage, and a first control valve arranged between the water tank and the inlet of the fuel / water supply passage. The second control valve and the control device that alternately and repeatedly opens the first control valve and the second control valve while the fuel injection pump is at rest are provided.
さらに第３の特徴は、燃料と水とを燃焼室に噴射する
水噴射ディーゼルエンジンにおいて、燃料噴射ポンプと
連通する第１の燃料供給路、逆止弁を内蔵しかつ燃料供
給路に合流する水供給路および逆止弁を内蔵しかつ第１
の燃料供給路と水供給路の合流部よりも下流側で第１の
燃料供給路と合流する第２の燃料供給路を有する燃料噴
射弁と、燃料タンクと第２の燃料供給路の入口との間に
配置される第１の制御弁と、水タンクと水供給路の入口
との間に配置される第２の制御弁と、燃料噴射ポンプが
休止している間に第１の制御弁と第２の制御弁とを交互
に繰り返して開動作させるコントロール装置とを備えて
なることにある。A third feature is that in a water-injection diesel engine that injects fuel and water into a combustion chamber, a first fuel supply passage communicating with a fuel injection pump, water containing a check valve and joining the fuel supply passage. Built-in supply line and check valve and first
A fuel injection valve having a second fuel supply passage that joins the first fuel supply passage downstream of the joining portion of the fuel supply passage and the water supply passage, and a fuel tank and an inlet of the second fuel supply passage. A first control valve arranged between the water tank and the inlet of the water supply passage, and a first control valve while the fuel injection pump is at rest And a control device for alternately repeating the second control valve and opening operation.
本発明は前記のように構成されているので、第１ない
し第３発明によれば、燃料噴射ポンプの休止期間中に注
入制御用の制御弁16が開くと、加圧された水および燃料
が、水タンク及び燃料タンクより水および燃料の切換弁
装置201あるいは２個の制御弁16,116により切替えられ
て交互に前記制御弁16を通って燃料噴射弁の合流部に流
入する。その結果、合流部近傍の注入通路には水−燃料
−水−燃料〜と多層状の液柱が形成されることとなる。
この水および燃料の多層状の液柱は注入制御用の前記制
御弁16が開いている間に燃料噴射弁内の合流部31を通
り、燃料油路中の前記合流部より上流側すなわち燃料噴
射ポンプ側の燃料を、燃料噴射ポンプに設けられた逆止
調整弁７を押しあけて燃料噴射ポンプ側へ押し戻しつ
つ、燃料油路中に充填される。このとき注入通路中に形
成された前記層状の液柱は、多層状の構造を保ったまま
充填されるので、燃料油路22中でも同様の水−燃料の多
層状の液柱が保存される燃料噴射ポンプが作動すると、
この液注はその多層状構造を保ったまま燃料噴射弁の針
弁をへて噴孔から噴射される。Since the present invention is configured as described above, according to the first to third inventions, when the control valve 16 for injection control is opened during the idle period of the fuel injection pump, pressurized water and fuel are released. The water and fuel are switched from the water tank and the fuel tank by the switching valve device 201 or the two control valves 16 and 116 and alternately flow through the control valve 16 and into the confluence portion of the fuel injection valve. As a result, a multi-layered liquid column of water-fuel-water-fuel-is formed in the injection passage near the confluence.
This multi-layered liquid column of water and fuel passes through the confluence portion 31 in the fuel injection valve while the control valve 16 for injection control is open, and is upstream of the confluence portion in the fuel oil passage, that is, fuel injection. The fuel on the pump side is filled in the fuel oil passage while pushing back the check regulating valve 7 provided on the fuel injection pump to push it back to the fuel injection pump side. At this time, the layered liquid column formed in the injection passage is filled while maintaining the multi-layered structure, so that a similar water-fuel multi-layered liquid column is stored in the fuel oil passage 22 as well. When the injection pump is activated,
This liquid injection is injected from the injection hole through the needle valve of the fuel injection valve while maintaining the multilayer structure.
これにより、従来のものに比べて水柱水量QWを大幅に
増大させても、注水時に水と燃料よりなる多層状の水が
噴射されるため燃焼の不安定化を避けることができる。As a result, even when the water column water amount Q W is significantly increased as compared with the conventional one, the destabilization of combustion can be avoided because a multi-layered water consisting of water and fuel is injected at the time of water injection.
従って、エンジンの作動不安定を招くことなく、水噴
射量の増大が実現でき、水噴射量の増大に対応した大幅
な排ガス中のNOXの低減効果が得られる。Therefore, an increase in the water injection amount can be realized without causing instability of the engine operation, and a significant reduction effect of NO X in the exhaust gas corresponding to the increase in the water injection amount can be obtained.
次に第４発明の特徴である水−燃料よりなる多層状の
液体をつくる装置の作用について説明すると、燃料噴射
ポンプが休止中にコントローラ装置20を介して第２の制
御弁16が開弁されると、水タンク19よりの水が燃料・通
水路15に注入され、燃料噴射弁の合流部31に流入し、燃
料油路中の前記合流部31よりも上流側の燃料を燃料噴射
ポンプに設けられた逆止調圧弁７を押し開け、燃料噴射
ポンプ側へ押し出しつつ燃料油路22中に充填される。次
に水注入用の第２の制御弁16を閉とし、さらに燃料注入
用の第１の制御弁116を開とすると、水注入の合流部31
より下流すなわち噴射弁針弁側に設けられた燃料注入の
合流部131に燃料が流入し、燃料油路中に先に注入され
た水および燃料を同時に燃料噴射ポンプ側に押しやりつ
つ燃料油路22中に燃料が充填される。続いて燃料注入用
の第２の制御弁116を閉および水注入用の第２の制御弁1
6を開とし上記と同じことを複数回繰り返す。その結
果、燃料油路中には燃料−水−燃料−水〜の交互の多層
状の液柱が形成され、以下第１〜第３発明と同様の作用
をなす。Next, the operation of the device for producing a multi-layered liquid composed of water and fuel, which is a feature of the fourth invention, will be described. The second control valve 16 is opened via the controller device 20 while the fuel injection pump is at rest. Then, the water from the water tank 19 is injected into the fuel / water passage 15 and flows into the merging portion 31 of the fuel injection valve, and the fuel upstream of the merging portion 31 in the fuel oil passage is supplied to the fuel injection pump. The check pressure regulating valve 7 provided is pushed open to fill the fuel oil passage 22 while pushing it out to the fuel injection pump side. Next, when the second control valve 16 for water injection is closed and the first control valve 116 for fuel injection is opened, the confluence section 31 for water injection is
Fuel flows into the fuel injection merging portion 131 provided further downstream, that is, on the injection valve needle valve side, and the water and fuel previously injected into the fuel oil passage are simultaneously pushed to the fuel injection pump side while simultaneously pushing the fuel oil passage. 22 is filled with fuel. Subsequently, the second control valve 116 for fuel injection is closed and the second control valve 1 for water injection is
Open item 6 and repeat the same procedure multiple times. As a result, an alternating multi-layered liquid column of fuel-water-fuel-water is formed in the fuel oil passage, and the same operation as the first to third inventions will be performed hereinafter.
以下第１〜９図を参照し本発明の一実施例について説
明する。An embodiment of the present invention will be described below with reference to FIGS.
第１〜６図は第１実施例に係わるものであり、第１図
は水噴射装置の構成図、第２図は切換弁の縦断面図、第
３図は第２図のIII−III断面図、第４図は切換弁の変形
例、第５〜６図は作用説明図、である。1 to 6 relate to the first embodiment, FIG. 1 is a block diagram of a water injection device, FIG. 2 is a vertical sectional view of a switching valve, and FIG. 3 is a III-III sectional view of FIG. FIG. 4 and FIG. 4 are modification examples of the switching valve, and FIGS.
第１図〜６図において、符号１〜31は第10図、第11図
に示す従来例のものと同一である。1 to 6, reference numerals 1 to 31 are the same as those of the conventional example shown in FIGS. 10 and 11.
13は従来例と同様、注入管15側から合流部31側へ向か
う流れのみを許容する構造となっている逆止弁である。
118は燃料加圧ポンプで、燃料タンク１からの燃料を吸
収し、加圧して燃料供給管117をへて切換弁装置201に導
く。一方、水供給ポンプ18にて加圧された水は、水供給
管17をへて同じく切換弁装置201に導かれる。また、燃
料供給管117および水供給管17と切換弁装置201との間に
は燃料タンク１及び水タンク19から切換弁装置201方向
への流れのみを許容する逆止弁203および204がそれぞれ
配設されている。202は切換弁201を駆動する駆動装置で
エンジンの回転数と同期した駆動装置あるいは、一定回
転の電動機でもよい。Similar to the conventional example, 13 is a check valve having a structure that allows only the flow from the injection pipe 15 side to the merging portion 31 side.
A fuel pressurizing pump 118 absorbs the fuel from the fuel tank 1, pressurizes it, and guides it to the switching valve device 201 through the fuel supply pipe 117. On the other hand, the water pressurized by the water supply pump 18 is also guided to the switching valve device 201 through the water supply pipe 17. Further, check valves 203 and 204, which allow only the flow from the fuel tank 1 and the water tank 19 toward the switching valve device 201, are arranged between the fuel supply pipe 117 and the water supply pipe 17 and the switching valve device 201, respectively. It is set up. Reference numeral 202 denotes a drive device for driving the switching valve 201, which may be a drive device synchronized with the engine speed or an electric motor of constant rotation.
第２図および第３図は切換弁201の詳細を示し、211お
よび212はそれぞれ水又は燃料の供給ポートで210は回転
弁である。該回転弁210には水開口溝214および燃料開口
溝215が設けられ、該回転弁210の回転により水および燃
料が交互に供給管213に送り込まれるように構成されて
いる。2 and 3 show the details of the switching valve 201, where 211 and 212 are water or fuel supply ports and 210 is a rotary valve. The rotary valve 210 is provided with a water opening groove 214 and a fuel opening groove 215, and water and fuel are alternately fed into the supply pipe 213 by the rotation of the rotary valve 210.
第４図はコントロール装置20と電磁式の２個の制御弁
16,116とを組み合わせた切換弁装置の第２変形例であ
る。16は水の制御弁、116は燃料の制御弁で、コントロ
ール装置20により燃料噴射ポンプ３が休止期間中に、交
互に所定期間開閉制御される。Fig. 4 shows the control device 20 and two electromagnetic control valves
It is the 2nd modification of the switching valve device which combined 16,116. Reference numeral 16 is a water control valve, and 116 is a fuel control valve. The control device 20 alternately controls opening and closing of the fuel injection pump 3 for a predetermined period during a rest period.
次に前記第１実施例の作用について説明する。 Next, the operation of the first embodiment will be described.
第２図、第３図の切換弁装置を使用している場合は、
燃料噴射ポンプの休止期間中に制御弁16が開くと、加圧
された水および燃料がそれぞれ供給管17および117をへ
て燃料・水通路15に流入するが、この際において、切換
弁201の作用で水と燃料が制御ポート211および212より
それぞれの開期間に対応して交互に流入する。When using the switching valve device of FIGS. 2 and 3,
When the control valve 16 is opened during the idle period of the fuel injection pump, the pressurized water and the fuel flow into the fuel / water passage 15 via the supply pipes 17 and 117, respectively. By the action, water and fuel alternately flow in from the control ports 211 and 212 corresponding to the respective open periods.
第４図に示される切換弁装置を備えた場合は、燃料噴
射ポンプ３の休止期間中に水おび燃料の制御弁16および
116がコントロール装置20により交互に開閉制御され、
燃料・水通路15内に、水および燃料がそれぞれ開期間に
対応して交互に流入する。その結果、燃料・水通路15内
には水および燃料が交互に多層状となった液柱が形成さ
れる。When the switching valve device shown in FIG. 4 is provided, the water and fuel control valves 16 and 16
116 is alternately opened and closed by the control device 20,
Water and fuel alternately flow into the fuel / water passage 15 corresponding to the open period. As a result, in the fuel / water passage 15, a liquid column in which water and fuel are alternately formed into a multi-layer is formed.
この多層状の液柱が注入期間中に順次燃料噴射弁本体
９に設けられた注入路21、逆止弁13および合流部31を通
って多層構造を保ったまま燃料油路22内に流入し、該燃
料油中の合流部31より上流側、すなわち燃料噴射ポンプ
３側の燃料は、燃料噴射ポンプ３に設けられた逆止調圧
弁７を押し開いて戻され、燃料油路22中に多層状液柱が
充填される。このとき注入路21中に形成された水−燃料
の交互多層状の液柱は、該多層状構造を保ったまま充填
されるので、燃料油路22中には第５図に示すような燃料
（白部分）−水（黒部分）−燃料−水〜のような交互に
多層状の液状が形成される。During the injection period, this multi-layered liquid column sequentially flows into the fuel oil passage 22 while maintaining the multi-layer structure through the injection passage 21, the check valve 13 and the confluence portion 31 provided in the fuel injection valve body 9. The fuel on the upstream side of the confluence portion 31 in the fuel oil, that is, on the fuel injection pump 3 side is pushed back by the check pressure regulating valve 7 provided in the fuel injection pump 3 and returned to the fuel oil passage 22. The lamellar liquid column is filled. At this time, the alternating water-fuel multi-layered liquid columns formed in the injection passage 21 are filled while maintaining the multi-layered structure, so that the fuel oil passage 22 is filled with the fuel as shown in FIG. (White portion) -water (black portion) -fuel-water-alternately, a multi-layered liquid is formed.
次に燃料噴射ポンプ３が作動して噴射を始めると、第
６図に示すように、針弁11の開弁により油溜部12の燃料
が、次いで燃料油路22中の水および燃料が交互に多層状
に噴射され最後に燃料のみが噴射され、これを繰返す。
このため、排ガス中にNOXを減少させるのに必要な水の
注入量を増加させても、エンジンの回転が不安定となる
おそれはない。Next, when the fuel injection pump 3 is activated and injection is started, as shown in FIG. 6, the needle valve 11 opens to cause the fuel in the oil reservoir 12 to alternate, and then the water and fuel in the fuel oil passage 22 to alternate. Is injected in multiple layers and finally only fuel is injected, and this is repeated.
Therefore, even if the injection amount of water required to reduce NO X in the exhaust gas is increased, there is no possibility that the engine rotation becomes unstable.
第７〜９図は第２実施例の構造図で、第７図は水噴射
装置の構造図、第８〜９図は作用説明図である。7 to 9 are structural views of the second embodiment, FIG. 7 is a structural view of the water injection device, and FIGS. 8 to 9 are operation explanatory views.
図において１〜31は従来例のもの（第10〜12図）のも
のと変らないので説明を省略する。118は燃料加圧ポン
プで、燃料タンク１から燃料供給路117をへて制御弁
（第１の制御弁）116に導かれる。115は燃料供給管、11
3は燃料供給逆止弁で、前記燃料用の制御弁116側への逆
流を制御するようになっている。In the figure, reference numerals 1 to 31 are the same as those in the conventional example (FIGS. 10 to 12), and therefore the description thereof is omitted. Reference numeral 118 denotes a fuel pressurizing pump, which is guided from the fuel tank 1 to a control valve (first control valve) 116 via a fuel supply passage 117. 115 is a fuel supply pipe, 11
A fuel supply check valve 3 controls the backflow to the fuel control valve 116 side.
即ち燃料、水の噴射弁40の本体９には、水供給逆止弁
13、水通路30及び同水通路30が連通する合流部31、並び
に燃料注入逆止弁113、燃料注入路130及び同燃料注入路
130と燃料油路22とが合流する燃料注入合流部131が設け
られている。燃料注入合流部131は水注入合流部31より
も燃料弁針弁11の油溜り部12側に設けられている。第７
図の第２実施例は油溜り部12に合流部131が設けられて
いる例である。燃料注入用の制御弁116は、燃料の注入
時期および注入量をコントロール装置20によって制御さ
れており、かつ水注入用の制御弁（第２制御弁）16およ
び燃料注入の制御弁116は共に燃料噴射ポンプの休止期
間中に交互に所定の期間開閉制御される。That is, the main body 9 of the fuel / water injection valve 40 has a water supply check valve.
13, a water passage 30 and a confluence portion 31 communicating with the water passage 30, a fuel injection check valve 113, a fuel injection passage 130, and the fuel injection passage.
A fuel injection merging section 131 is provided at which 130 and the fuel oil passage 22 merge. The fuel injection merging portion 131 is provided closer to the oil reservoir 12 side of the fuel valve needle valve 11 than the water injection merging portion 31. Seventh
The second embodiment shown in the figure is an example in which a confluence portion 131 is provided in the oil sump portion 12. The fuel injection control valve 116 controls the fuel injection timing and injection amount by the control device 20, and the water injection control valve (second control valve) 16 and the fuel injection control valve 116 are both fuel. Opening / closing control is alternately performed for a predetermined period during the idle period of the injection pump.
次に前記第２実施例の作用について説明する。 Next, the operation of the second embodiment will be described.
燃料噴射ポンプ３の休止期間中に先ず水の制御弁16が
コントロール装置20を介して開かれると、従来例と同様
に、水が制御弁16から逆止弁13、水通路30をへて水注入
合流部31から燃料油路22へと流入し、燃料油路22中の合
流部31より上流側即ち燃料噴射ポンプ側の燃料を、逆止
調圧弁７を押し開き燃料噴射ポンプ３側へ押しもどし
て、燃料油路22中に充填される。次にコントロール装置
20を介して水注入用の制御弁16が閉じられ燃料注入用の
制御弁116が開かれる。これによって水注入の合流部31
よりも下流側すなわち針弁11の油溜り12側に設けられた
燃料注入の合流部131よりも上流の燃料が、水注入の場
合と全く同様の作用により流入し、燃料油路22中の先に
注入された水および燃料を燃料噴射ポンプ３側へ押しも
どしつつ燃料油路22中に燃料が充填される。その結果、
燃料油路22中の水は、水注入の合流部31よりも上流側へ
押しもどされ、その水と水注入合流部131の間には燃料
が充填されることになる。続いてコントロール装置を介
して燃料注入用の制御弁116を閉とし、水注入用の制御
弁16を開となし、上記と同じことを複数回繰り返す。こ
の時の制御弁16,116の作動状況を第９図に示す。この結
果、燃料油路22中には第８図に示すように燃料（白部
分）−水（黒部分）−燃料−水〜のように交互の多層状
の液柱が形成される。When the water control valve 16 is first opened via the control device 20 during the idle period of the fuel injection pump 3, water flows from the control valve 16 to the check valve 13 and the water passage 30 as in the conventional example. The fuel flowing into the fuel oil passage 22 from the injection merging portion 31 and pushing the fuel on the upstream side of the merging portion 31 in the fuel oil passage 22, that is, the fuel injection pump side, opens the check pressure regulating valve 7 and pushes it toward the fuel injection pump 3 side. The fuel oil passage 22 is returned and filled. Then the control device
Via 20 the control valve 16 for water injection is closed and the control valve 116 for fuel injection is opened. As a result of this
The fuel on the downstream side, that is, on the upstream side of the fuel injection merging portion 131 provided on the oil sump 12 side of the needle valve 11 flows in by the same action as in the case of water injection, and the tip in the fuel oil passage 22 The fuel oil passage 22 is filled with fuel while pushing back the water and fuel injected into the fuel injection pump 3 side. as a result,
The water in the fuel oil passage 22 is pushed back to the upstream side of the water injection merging portion 31, and the fuel is filled between the water and the water injection merging portion 131. Subsequently, the control valve 116 for fuel injection is closed via the control device, the control valve 16 for water injection is opened, and the same operations as above are repeated a plurality of times. The operating conditions of the control valves 16 and 116 at this time are shown in FIG. As a result, alternating multi-layered liquid columns are formed in the fuel oil passage 22 as shown in FIG. 8 such as fuel (white portion) -water (black portion) -fuel-water.
燃料噴射ポンプ３が作動して噴射がはじまると、針弁
11の開弁により油溜り部12及び燃料油路22中の水および
燃料が噴射されるが、このとき第６図に示すように、燃
料及び水が交互に多層状に噴射されることになるので排
ガス中のNOXを低減するため噴霧内への注水量を多くし
た場合も、エンジンの燃焼が不安定化するおそれはな
い。When the fuel injection pump 3 operates and the injection starts, the needle valve
When the valve 11 is opened, water and fuel in the oil sump 12 and the fuel oil passage 22 are injected. At this time, as shown in FIG. 6, the fuel and water are alternately injected in multiple layers. Therefore, even if the amount of water injected into the spray is increased in order to reduce NO X in the exhaust gas, there is no possibility that the combustion of the engine will become unstable.
本発明は燃料と水を同一の燃料噴射弁から噴射する水
噴射ディーゼルエンジンにおいて、従来水が中間的に噴
射されていたのに変えて、燃料と水を多層状に噴射する
ようにしたので、水の注入量を大幅に増大させても、中
間に多層状に燃料が噴射されるので、燃焼が不安定とな
ることはない。The present invention, in a water-injection diesel engine that injects fuel and water from the same fuel injection valve, instead of conventionally water was injected intermediately, so that the fuel and water are injected in multiple layers, Even if the water injection amount is greatly increased, the fuel is injected in multiple layers in the middle, so that combustion does not become unstable.
その結果、エンジンの燃焼不良を招くことなく、水噴
射量の増大が可能となり、該水噴射量の増大に対応して
大幅な排ガス中のNOXの低減効果を得ることができる。As a result, it is possible to increase the amount of water injection without causing poor combustion of the engine, and it is possible to obtain a significant effect of reducing NO X in the exhaust gas in response to the increase in the amount of water injection.
第１〜６図は第１実施例に係わるもので、第１図は水噴
射装置の構成図、第２図は水、燃料の切換弁の縦断面
図、第３図は第２図のIII−III断面図、第４図は同切換
弁の変形例、第５〜６図は実施例の作用説明図、第７〜
９図は第２実施例に係わるもので、第７図は水噴射装置
の構成図、第８〜９図は実施例の作用説明図、第10〜12
図は従来例で第10図は第１図応当図、第11図は第６図応
当図、第12図は作用説明図である。 40……燃料噴射弁、13,113……逆止弁、15……燃料・水
通路、16,116……制御弁、31,131……合流部、21……流
入路、22……燃料油路、17……水供給管、117……燃料
供給管、201……切換弁装置。1 to 6 relate to the first embodiment, FIG. 1 is a configuration diagram of a water injection device, FIG. 2 is a longitudinal sectional view of a water / fuel switching valve, and FIG. 3 is III of FIG. -III sectional view, FIG. 4 is a modification of the same switching valve, FIGS.
FIG. 9 relates to the second embodiment, FIG. 7 is a configuration diagram of a water injection device, FIGS. 8 to 9 are operation explanatory views of the embodiment, and 10 to 12
FIG. 10 is a conventional example, FIG. 10 is a diagram of FIG. 1, FIG. 11 is a diagram of FIG. 6, and FIG. 40 …… fuel injection valve, 13,113 …… check valve, 15 …… fuel / water passage, 16,116 …… control valve, 31,131 …… merging part, 21 …… inflow passage, 22 …… fuel oil passage, 17 …… Water supply pipe, 117 ... Fuel supply pipe, 201 ... Switching valve device.
Claims (4)
ーゼルエンジンにおいて、燃料噴射弁の中に燃料供給路
および逆止弁を有する燃料・水供給路を設けるととも
に、燃料・水供給路を燃料供給路に合流させ、燃料供給
路と連通する燃料噴射ポンプが燃料の噴射を休止してい
る間に、燃料・水供給路へ燃料と水を交互に繰り返して
供給することにより、燃料供給路内に燃料と水が交互に
多層状に積層された液柱を形成させ、その後燃料噴射ポ
ンプにより燃料を圧送し、液柱の下流側燃料、液柱を形
成する燃料および水、液柱の上流側燃料を燃焼室に噴射
させることを特徴とする水噴射ディーゼルエンジンにお
ける燃料及び水の噴射方法。1. A water injection diesel engine for injecting fuel and water into a combustion chamber, wherein a fuel / water supply passage having a fuel supply passage and a check valve is provided in the fuel injection valve, and the fuel / water supply passage is provided. To the fuel supply path, and while the fuel injection pump that communicates with the fuel supply path suspends fuel injection, supplies fuel and water alternately and repeatedly to the fuel / water supply path to supply the fuel. In the passage, a liquid column in which fuel and water are alternately laminated in multiple layers is formed, and then the fuel is pumped by the fuel injection pump, and the fuel on the downstream side of the liquid column, the fuel and water forming the liquid column, and the liquid column A method for injecting fuel and water in a water-injection diesel engine, characterized by injecting upstream fuel into a combustion chamber.
ーゼルエンジンにおいて、燃料噴射ポンプと連通する燃
料供給路と逆止弁を内蔵しかつ燃料供給路に合流する燃
料・水供給路とを有する燃料噴射弁と、燃料タンクおよ
び水タンクと別々に連通し燃料と水を交互に吐出する切
返弁装置と、切換弁装置の吐出口と燃料・水供給路の入
口との間に配置される制御弁と、燃料噴射ポンプが休止
している間に制御弁を開動作させるコントロール装置と
を備えてなることを特徴とする水噴射ディーゼルエンジ
ンにおける燃料及び水の噴射装置。2. A water injection diesel engine for injecting fuel and water into a combustion chamber, a fuel supply passage communicating with a fuel injection pump, and a fuel / water supply passage incorporating a check valve and joining the fuel supply passage. Disposed between the discharge port of the switching valve device and the inlet of the fuel / water supply passage, the fuel injection valve having a valve, the cut-off valve device that communicates with the fuel tank and the water tank separately, and alternately discharges fuel and water And a control device for opening the control valve while the fuel injection pump is at rest, and a fuel and water injection device in a water injection diesel engine.
ーゼルエンジンにおいて、燃料噴射ポンプと連通する燃
料供給部と逆止弁を内蔵しかつ燃料供給路に合流する燃
料・水供給路とを有する燃料噴射弁と、燃料タンクと燃
料・水供給路の入口との間に配置される第１の制御弁と
水タンクと燃料・水供給路の入口との間に配置される第
２の制御弁と、燃料噴射ポンプが休止している間に第１
の制御弁と第２の制御弁とを交互に繰り返して開動作さ
せるコントロール装置とを備えてなることを特徴とする
水噴射ディーゼルエンジンにおける燃料及び水の噴射装
置。3. A water injection diesel engine for injecting fuel and water into a combustion chamber, comprising a fuel supply section communicating with a fuel injection pump, and a fuel / water supply path having a built-in check valve and joining the fuel supply path. And a first control valve arranged between the fuel tank and the inlet of the fuel / water supply passage, and a second control valve arranged between the water tank and the inlet of the fuel / water supply passage. First while the control valve and fuel injection pump are at rest
2. A fuel and water injection device in a water injection diesel engine, comprising: a control device for alternately repeating and repeatedly opening the control valve and the second control valve.
ーゼルエンジンにおいて、燃料噴射ポンプと連通する第
１の燃料供給路、逆止弁を内蔵しかつ燃料供給路に合流
する水供給路および逆止弁を内蔵しかつ第１の燃料供給
路と水供給路の合流部よりも下流側で第１の燃料供給路
と合流する第２の燃料供給路を有する燃料噴射弁と、燃
料タンクと第２の燃料供給路の入口との間に配置される
第１の制御弁と、水タンクと水供給路の入口との間に配
置される第２の制御弁と、燃料噴射ポンプが休止してい
る間に第１の制御弁と第２の制御弁とを交互に繰り返し
て開動作させるコントロール装置とを備えてなることを
特徴とする水噴射ディーゼルエンジンにおける燃料及び
水の噴射装置。4. A water injection diesel engine for injecting fuel and water into a combustion chamber, a first fuel supply passage communicating with a fuel injection pump, a water supply passage incorporating a check valve and joining the fuel supply passage. And a fuel injection valve having a check valve built-in and having a second fuel supply passage that joins the first fuel supply passage downstream of the joining portion of the first fuel supply passage and the water supply passage, and a fuel tank. And a second control valve arranged between the water tank and the inlet of the water supply passage, a second control valve arranged between the water tank and the inlet of the second fuel supply passage, and the fuel injection pump is stopped. A fuel and water injection device in a water injection diesel engine, comprising: a control device that alternately and repeatedly opens the first control valve and the second control valve while opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2302492A JPH0811945B2 (en) | 1990-11-09 | 1990-11-09 | Fuel and water injection method and injection device for water injection diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2302492A JPH0811945B2 (en) | 1990-11-09 | 1990-11-09 | Fuel and water injection method and injection device for water injection diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04175446A JPH04175446A (en) | 1992-06-23 |
| JPH0811945B2 true JPH0811945B2 (en) | 1996-02-07 |
Family
ID=17909616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2302492A Expired - Fee Related JPH0811945B2 (en) | 1990-11-09 | 1990-11-09 | Fuel and water injection method and injection device for water injection diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0811945B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012077484A1 (en) | 2010-12-08 | 2012-06-14 | 三菱重工業株式会社 | Fuel injection device for internal combustion engines, and fuel injection method for internal combustion engines |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7102160B2 (en) | 2018-02-13 | 2022-07-19 | 株式会社ジャパンエンジンコーポレーション | Fuel injection device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5113806A (en) * | 1974-07-24 | 1976-02-03 | Tanabe Seiyaku Co | KOSANKAZAI |
-
1990
- 1990-11-09 JP JP2302492A patent/JPH0811945B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012077484A1 (en) | 2010-12-08 | 2012-06-14 | 三菱重工業株式会社 | Fuel injection device for internal combustion engines, and fuel injection method for internal combustion engines |
| KR101410165B1 (en) * | 2010-12-08 | 2014-06-19 | 미츠비시 쥬고교 가부시키가이샤 | Fuel injection device for internal combustion engines, and fuel injection method for internal combustion engines |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04175446A (en) | 1992-06-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |