JPH05288129A - Water injection type diesel engine - Google Patents

Water injection type diesel engine

Info

Publication number
JPH05288129A
JPH05288129A JP4114255A JP11425592A JPH05288129A JP H05288129 A JPH05288129 A JP H05288129A JP 4114255 A JP4114255 A JP 4114255A JP 11425592 A JP11425592 A JP 11425592A JP H05288129 A JPH05288129 A JP H05288129A
Authority
JP
Japan
Prior art keywords
fuel
water
passage
valve
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.)
Granted
Application number
JP4114255A
Other languages
Japanese (ja)
Other versions
JP2934552B2 (en
Inventor
Yoshinori Nagae
禎範 永江
Yozo Tosa
陽三 土佐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP4114255A priority Critical patent/JP2934552B2/en
Publication of JPH05288129A publication Critical patent/JPH05288129A/en
Application granted granted Critical
Publication of JP2934552B2 publication Critical patent/JP2934552B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00Engines characterised by air compression and subsequent fuel addition
    • F02B3/06Engines characterised by air compression and subsequent fuel addition with compression ignition

Abstract

PURPOSE:To remarkably decrease NOX in an exhaust gas in response to increase in a water injection quantity and provide a water injection type diesel engine which has good durability and high reliability without causing any combustion deterioration even if the water injection quantity is increased, by injecting fuel and water into a cylinder in a multi-layer form. CONSTITUTION:A fuel injection pump 3 equipped with a check adjusting pressure valve 7 in the side passage of a fuel discharge valve 6, a first fuel passage 22 and a fuel injection pipe 8 are provided, in an engine which injects fuel and water into a cylinder from one fuel injection valve 40. The engine is provided with fuel supply pipe passage 117, 115 which communicate a fuel tank 1 to a second fuel passage 121, water supply pipe passage 17, 15 which communicate a water tank 19 to a water supply flow passage 21, electromagnetic control valves 16, 116 which openly and closely control a water supply pipe passage and a fuel supply pipe passage respectively. And it is also provided with a control unit 20 which controls the electromagnetic control valves, a check valve 13 equipped downstream of a confluent part 131 of the water flow passage and a second fuel passage in a fuel injection valve, and a confluent part 31 where a passage 230 downstream of the same valve and the first fuel passage are combined together.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【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。
FIELD OF THE INVENTION This invention relates to water injection diesel engines.

【0002】[0002]

【従来の技術】ディーゼルエンジンの排ガス内の窒素酸
化物(NOX ) を低減し、同時に排気黒煙や燃料消費率
の低減も併せて達成する手段として、同一の燃料噴射弁
から燃料と水をシリンダ内に噴射する水噴射ディーゼル
エンジンによる対応が有効であるとされている。図5に
従来の前記エンジンの燃料・水噴射装置の構成を示す。
図において、1は燃料タンク、2は燃料供給ポンプ、3
は燃料噴射ポンプで、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は噴口、11は針弁、12は油だ
まり、14は針弁11の押えばねである。
2. Description of the Related Art Fuel and water are discharged from the same fuel injection valve as a means for reducing nitrogen oxides (NO x ) in exhaust gas of a diesel engine and at the same time reducing exhaust black smoke and fuel consumption rate. It is said that a water injection diesel engine that injects into the cylinder is effective. FIG. 5 shows the structure of a conventional fuel / water injection device for the engine.
In the figure, 1 is a fuel tank, 2 is a fuel supply pump, 3
Is a fuel injection pump, 4 is the same plunger, 5 is a plunger barrel, 6 is a discharge valve, 7 is a non-return pressure regulating valve provided in a side passage of the discharge valve 6, 8 is a fuel injection pipe, and 40 is a fuel injection valve. Here, 9 is the same body, 10 is an injection port, 11 is a needle valve, 12 is oil reservoir, and 14 is a holding spring of the needle valve 11.

【0003】また、19は水タンク、18は水供給ポン
プ、17は水供給管(ポンプ側)、16は水供給制御
弁、15は水供給管(噴射弁側)、13は水供給の逆止
弁で水の制御弁側への逆流を防止する。20は水の供給
量及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及びその他のエンジン作動条件の信
号を入力し、回線23を介して制御弁16に開閉信号を
出力する。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と油だまり12とを連通
させている。また噴射弁40の本体9には給水流入路2
1が穿孔されており、流路の途中には逆止弁13が配設
され、流路下流部に穿設された水通路30を介して前記
燃料通路22の途中の合流部31へ連通している。
Further, 19 is a water tank, 18 is a water supply pump, 17 is a water supply pipe (pump side), 16 is a water supply control valve, 15 is a water supply pipe (injection valve side), and 13 is the reverse of water supply. The stop valve prevents water from flowing back to the control valve side. Reference numeral 20 denotes a control device for controlling the amount and timing of water supply, which inputs a crank angle signal of the engine and signals of other engine operating conditions, and outputs an open / close signal to the control valve 16 via a line 23. 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 oil sump 12 to each other. Further, the main body 9 of the injection valve 40 has a water supply inflow passage 2
1 is perforated, a check valve 13 is arranged in the middle of the flow passage, and communicates with a confluence portion 31 in the middle of the fuel passage 22 via a water passage 30 formed in the downstream portion of the flow passage. ing.

【0004】前記の構成による作用は次のとおりであ
る。水タンク19より水供給ポンプ18によって圧送さ
れた水は水供給管17を通って制御弁16へ送られ、燃
料噴射ポンプ3のプランジャ4が燃料の圧送を行なって
いない休止期間中は、前記制御弁16がコントロール装
置を介して所定期間、開弁状態に保持され、所定量の水
が水供給管15を介して燃料噴射弁40の給水流入路2
1へ送り込まれる。その際、燃料噴射ポンプ3の逆止調
圧弁7の開弁圧をPR 、給水逆止弁13の開弁圧を
P 、針弁11の開弁圧をPO とすると、 PO >PR ,PO >PP となっているので、供給された水は給水逆止弁13を通
過し、水通路30から合流部31を経て燃料通路22内
へ流入する。この供給水圧によって燃料通路22内の合
流部31より上流側、即ち燃料噴射ポンプ3側にある燃
料は、噴射管8内を噴射ポンプ3の方向へ押し戻され、
逆止調圧弁7を押し開いてプランジャバレル内へ逆流す
る。
The operation of the above configuration is as follows. The water pumped from the water tank 19 by the water supply pump 18 is sent to the control valve 16 through the water supply pipe 17, and during the rest period when the plunger 4 of the fuel injection pump 3 is not pumping the fuel, the control is performed. The valve 16 is kept open for a predetermined period of time via the control device, and a predetermined amount of water is supplied through the water supply pipe 15 to the feed water inflow passage 2 of the fuel injection valve 40.
Sent to 1. At this time, if the valve opening pressure of the check pressure regulating valve 7 of the fuel injection pump 3 is P R , the valve opening pressure of the feedwater check valve 13 is P P , and the valve opening pressure of the needle valve 11 is P O , then P O > Since P R and P O > P P , the supplied water passes through the water check valve 13 and flows from the water passage 30 into the fuel passage 22 through the confluence portion 31. Due to this supply water pressure, 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 in the injection pipe 8 toward the injection pump 3,
The check pressure regulating valve 7 is pushed open to flow back into the plunger barrel.

【0005】その結果の状況を図6に示した。燃料噴射
弁40内には、油だまり12の容積V2 と、合流部31
から油だまり12までの燃料通路22の容積V1 との和
である(V1 +V2 )の容積には燃料が満され、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、さらにその上流の燃料通路22内には再び燃料が
満された状態となっている。つぎに燃料噴射ポンプ3の
プランジャ4が上昇して燃料を加圧すると、燃料噴射管
8、燃料通路22および油だまり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
水が制御弁16側へ押し戻されることはない。
The resulting situation is shown in FIG. In the fuel injection valve 40, the volume V 2 of the oil sump 12 and the merging portion 31
The volume of (V 1 + V 2 ) which is the sum of the volume V 1 of the fuel passage 22 from the oil reservoir 12 to the sump 12 is filled with fuel, and the fuel passage 22 on the upstream side of the merging portion 31 has a predetermined amount. The water is filled, and the fuel passage 22 further upstream thereof is filled with the fuel again. Next, when the plunger 4 of the fuel injection pump 3 rises to pressurize the fuel, the pressure in the fuel injection pipe 8, the fuel passage 22 and the oil sump 12 rises and becomes equal to or higher than the valve opening pressure P O of the needle valve 11. The needle valve 11 is opened. At this time, the water in the water passage 30 is not pushed back to the control valve 16 side by the action of the check valve 13.

【0006】燃料の圧力が針弁11の開弁圧PO を超え
ると噴口10からは、まず前述の(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。即ち、1回の全噴射燃料の量をQF とすると、図7
に示すようにまず最初にQFP=(V1 +V2 )なる量の
燃料が噴射され、続いて所定量の水の全量QW が噴射さ
れ、残りの燃料量をQFSとするとQFS=QF −QFPが最
後に噴射されることになる。この結果、まずQFPの燃料
噴射により燃焼行程初期の着火が確実に行われ、引続く
W の水の噴射により燃料噴霧内への空気の導引が増加
し、燃焼速度の上昇および黒煙発生の低減が達成される
とともに燃焼域への水の導入によりNOX の低減を図る
ことが可能となる。
When the fuel pressure exceeds the valve opening pressure P O of the needle valve 11, the above-mentioned (V 1 + V 2 ) volume of fuel is first injected from the injection port 10, and then a predetermined amount of water is supplied. Is injected, and finally the remaining fuel is fully injected. That is, assuming that the amount of fuel injected once is Q F , FIG.
As shown in Fig. 1, first, a quantity of fuel of Q FP = (V 1 + V 2 ) is injected, then a total quantity of water Q W of a predetermined quantity is injected, and assuming that the remaining quantity of fuel is Q FS , Q FS = Q F -Q FP is to be finally injected. As a result, first of all, the fuel injection of Q FP surely ignites in the early stage of the combustion stroke, and the subsequent injection of water of Q W increases the induction of air into the fuel spray, thereby increasing the combustion speed and black smoke. it is possible to reduce of the NO X by the introduction of water into the combustion zone with reduced generation is achieved.

【0007】[0007]

【発明が解決しようとする課題】しかしながら前記した
従来の技術においては次のような問題点があった。即
ち、燃料噴射弁40の逆止弁部及び合流部までの通路に
は常時供給された水があり、噴射されるときには高圧に
なり、噴射を終ると低圧にもどる。この噴射終了の際に
往々にして前記の通路内にキャビテーションを生じるこ
とがあり、水の場合には燃料にくらべ同じキャビテーシ
ョン強度においても数倍のエロージョン性のあることが
経験されており、前記部分に水が存在することは噴射弁
の耐久性上問題点として指摘されその解決手段が求めら
れていた。
However, the above-mentioned conventional technique has the following problems. That is, there is always supplied water in the passage to the check valve portion and the merging portion of the fuel injection valve 40, and the water has a high pressure when it is injected, and returns to a low pressure when the injection is finished. Cavitation often occurs in the passage at the end of this injection, and it has been observed that water has several times more erosion than fuel at the same cavitation strength. It was pointed out that the existence of water in the injection valve was a problem in terms of durability of the injection valve, and a solution was required.

【0008】さらに排ガス内の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、燃料の全噴射量
F に対してQW を増やしすぎると、燃料の初期噴射量
FPと後期噴射量QFSとの噴射の時間間隔が開きすぎる
ことになり、燃焼不良を招きエンジンの作動は安定を欠
くようになる。従って、NOX の低減効果を得るために
は、燃焼不良を招くことなく水噴射量QW を増加させる
ことができる手法を講じる必要があった。
Further, the effect of reducing NO X in the exhaust gas can be obtained almost in proportion to the injection amount Q W of water. However, if Q W is excessively increased with respect to the total injection amount Q F of fuel, the initial injection amount of fuel is increased. The time interval between the injections of Q FP and the late injection amount Q FS becomes too wide, resulting in poor combustion and unstable engine operation. Therefore, in order to obtain the NO X reduction effect, it is necessary to take a method capable of increasing the water injection amount Q W without causing combustion failure.

【0009】本発明の目的は前述の問題点を解消し、燃
料と水とが多層状にシリンダ内に噴射されるような構成
とすることにより、水の噴射量を増加させても燃焼不良
を招くことなく、排ガス内のNOX が大巾に低減され、
耐久性にも優れた信頼性の高い水噴射ディーゼルエンジ
ンを提供することにある。
The object of the present invention is to solve the above-mentioned problems and to make a structure in which fuel and water are injected into the cylinder in a multi-layered manner, so that even if the injection amount of water is increased, combustion failure will occur. NO X in exhaust gas is greatly reduced without inviting
It is to provide a highly reliable water-injection diesel engine with excellent durability.

【0010】[0010]

【課題を解決するための手段】本発明の水噴射ディーゼ
ルエンジンは同一の燃料噴射弁から燃料と水をシリンダ
内に噴射する水噴射ディーゼルエンジンにおいて、燃料
吐出弁の側路に逆止調圧弁が設けられている燃料噴射ポ
ンプと、燃料と水を噴射する燃料噴射弁と、該燃料噴射
弁内の第1の燃料通路と前記燃料噴射ポンプを連通する
燃料噴射管と、燃料タンクと前記燃料噴射弁内の第2の
燃料通路を連通する第2の燃料供給管路と、水タンクと
前記燃料噴射弁内の流入路を連通する水供給管路と、該
水供給管路と前記第2の燃料供給管路を夫々開閉制御す
る電磁式制御弁と、該電磁式制御弁を回線を介して制御
するコントロール装置と、前記燃料噴射弁内の水の流入
路と第2の燃料通路との合流部の下流に設けられた逆止
弁と、該逆止弁下流の通路と前記第1の燃料通路とが合
流する合流部とを有してなることを特徴としている。
A water injection diesel engine of the present invention is a water injection diesel engine in which fuel and water are injected into a cylinder from the same fuel injection valve, and a check pressure regulating valve is provided in a side passage of a fuel discharge valve. A fuel injection pump provided, a fuel injection valve for injecting fuel and water, a fuel injection pipe for communicating the first fuel passage in the fuel injection valve with the fuel injection pump, a fuel tank, and the fuel injection. A second fuel supply conduit communicating with a second fuel passage in the valve; a water supply conduit communicating with a water tank and an inflow passage in the fuel injection valve; and the water supply conduit and the second fuel supply conduit. Electromagnetic control valves for controlling the opening and closing of the fuel supply pipes, a control device for controlling the electromagnetic control valves via lines, and a confluence of the water inflow passage in the fuel injection valve and the second fuel passage. Check valve provided on the downstream side of the Passage and said first fuel passage is characterized by comprising and a merging unit for merging.

【0011】[0011]

【作用】本発明では前記のような構成と制御によってい
るので下記のように作用する。即ち燃料噴射ポンプ3か
らの加圧による燃料・水の噴射終了後から次のサイクル
での噴射までの休止期間中に、水供給管路の電磁式制御
弁16と燃料供給管路の電磁式制御弁116を、コント
ロール装置を介して電子的に制御し複数回繰返して交互
に開閉させ、噴射ポンプ3内の逆止調圧弁7と、噴射弁
40内の逆止弁13の機能も併せ利用され、噴射弁内に
流入路21から流入した水と第2の燃料通路121から
流入した燃料が所定量づつ交互に第1の燃料通路22に
送り込まれ燃料と水の多層状の液柱が形成される。これ
により噴射ポンプが作動をはじめると、燃料と水とが交
互に多層状にシリンダ内に噴射される。なお燃料と水の
燃料通路22への多層注入の最終時には燃料供給制御弁
116を作用させることにより、逆止弁部13からその
下流通路230を経て合流部31までの流路には燃料を
充填しておくことができる。
Since the present invention has the above-mentioned configuration and control, it operates as follows. That is, during the rest period from the end of fuel / water injection by pressurization from the fuel injection pump 3 to the injection in the next cycle, the electromagnetic control valve 16 of the water supply line and the electromagnetic control of the fuel supply line are controlled. The valve 116 is electronically controlled through a control device to be alternately opened and closed a plurality of times repeatedly, and the functions of the check pressure adjusting valve 7 in the injection pump 3 and the check valve 13 in the injection valve 40 are also used. A predetermined amount of the water flowing from the inflow passage 21 and the fuel flowing from the second fuel passage 121 into the injection valve are alternately sent to the first fuel passage 22 to form a multi-layered liquid column of fuel and water. It As a result, when the injection pump starts operating, fuel and water are alternately injected into the cylinder in multiple layers. At the final stage of multi-layer injection of fuel and water into the fuel passage 22, the fuel supply control valve 116 is operated to fill the flow passage from the check valve portion 13 through the downstream passage 230 to the confluence portion 31 with fuel. You can keep it.

【0012】[0012]

【実施例】図1に本発明の実施例に係る燃料・水噴射装
置の構成を示す。図において、1〜31は従来の技術で
の構成について示した図5におけるものと同様であるの
で説明を省略し、本発明の実施例で付加された構成につ
いて述べる。燃料は第2の燃料供給管路からも燃料噴射
弁40へ供給される。118の燃料加圧ポンプにより、
燃料が燃料タンク1から燃料供給管117を経て電磁式
燃料制御弁116に圧送され、燃料供給管115を通っ
て噴射弁本体9に穿設されている第2の燃料通路121
へ流入する。131は水の流入路21と第2の燃料通路
121との合流部、230は逆止弁下流通路であり、第
1の燃料通路22と合流部31で合流している。なお、
逆止弁下流通路230と第1の燃料通路22との合流
は、本実施例によるほか、油だまり12や逆止弁13の
下流であればよい。
FIG. 1 shows the structure of a fuel / water injection device according to an embodiment of the present invention. In the figure, reference numerals 1 to 31 are the same as those in FIG. 5 showing the configuration according to the conventional technique, and therefore the description thereof is omitted, and the configuration added in the embodiment of the present invention will be described. Fuel is also supplied to the fuel injection valve 40 from the second fuel supply line. With 118 fuel pressure pump,
The fuel is pressure-fed from the fuel tank 1 to the electromagnetic fuel control valve 116 via the fuel supply pipe 117, and passes through the fuel supply pipe 115 to form the second fuel passage 121 formed in the injection valve body 9.
Flow into. Reference numeral 131 denotes a confluence portion between the water inflow passage 21 and the second fuel passage 121, and 230 denotes a check valve downstream passage, which joins the first fuel passage 22 at the confluence portion 31. In addition,
The merging of the check valve downstream passage 230 and the first fuel passage 22 may be performed downstream of the oil sump 12 and the check valve 13 in addition to this embodiment.

【0013】次に実施例での作用について述べ、その際
の電磁式水供給制御弁16および電磁式燃料供給制御弁
116の作動状況を図2に示す。燃料噴射ポンプ3が休
止中に、コントロール装置20の制御により燃料供給制
御弁116の閉弁時に、水供給制御弁16が開弁される
と、水タンク19から水供給ポンプ18と水供給管(ポ
ンプ側)17、水供給制御弁16、水供給管(噴射弁
側)15を経て、水が噴射弁本体9の水流入路21に圧
送される。圧送されてきた水は逆止弁13を押しあけ、
この部分の燃料を燃料噴射ポンプ3に配設してある逆止
調圧弁7を押しあけることによって噴射ポンプ側へ押し
戻しつつ、逆止弁の下流通路230に水が充填される。
Next, the operation of the embodiment will be described, and the operating conditions of the electromagnetic water supply control valve 16 and the electromagnetic fuel supply control valve 116 at that time are shown in FIG. When the water supply control valve 16 is opened while the fuel supply control valve 116 is closed by the control of the control device 20 while the fuel injection pump 3 is at rest, the water supply pump 18 and the water supply pipe 18 from the water tank 19 ( Water is pumped to the water inflow passage 21 of the injection valve main body 9 via the pump side) 17, the water supply control valve 16, and the water supply pipe (injection valve side) 15. The pumped water pushes the check valve 13 open,
The fuel of this portion is filled with water in the downstream passage 230 of the check valve while pushing back the check pressure regulating valve 7 arranged in the fuel injection pump 3 to push it back to the injection pump side.

【0014】続いて、コントロール装置20の制御によ
り水供給制御弁16を閉弁とし燃料供給制御弁116を
開弁とすると、合流部131から燃料が流入して、先に
注入された水及び燃料を共に噴射ポンプ側に押しやりつ
つ、燃料通路22中に燃料が充填される。引続いて燃料
供給制御弁116を閉弁、水供給制御弁16を開弁とし
て前記と同じことを複数回繰返し、最後に燃料供給制御
弁116を開弁として、逆止弁部13からその下流通路
230を経て第1の燃料通路22との合流部31まで燃
料を注入する。図2はこの間の両制御弁16,116の
作動状況を表している。
Next, when the water supply control valve 16 is closed and the fuel supply control valve 116 is opened under the control of the control device 20, the fuel flows from the merging portion 131, and the water and the fuel previously injected are introduced. The fuel is filled in the fuel passage 22 while pushing both of them toward the injection pump. Subsequently, the fuel supply control valve 116 is closed, the water supply control valve 16 is opened, and the same operation is repeated a plurality of times. Finally, the fuel supply control valve 116 is opened, and the check valve portion 13 and its downstream side are opened. Fuel is injected through the passage 230 to the confluence portion 31 with the first fuel passage 22. FIG. 2 shows the operating state of both control valves 16 and 116 during this period.

【0015】この結果、第1の燃料通路22中には図3
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。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
により油だまり12及び燃料通路22中の燃料及び水が
噴射されるが、このとき図4に示すように燃料と水とが
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
でも燃焼が不安定になるおそれはない。さらに、燃料噴
射弁の高圧が作用する部分には、燃料のみが残ることに
より、従来と同様の耐久性を維持することができる。
As a result, in the first fuel passage 22, FIG.
As shown in (4), alternate multi-layered liquid columns are formed such as fuel (white part) -water (black part) -fuel-water. When the fuel injection pump 3 is activated to start the injection, the needle valve 11 is opened to inject the fuel and water in the oil sump 12 and the fuel passage 22. At this time, as shown in FIG. since There will be injected in multi-layered alternately, there is no risk that the combustion becomes unstable even when a lot of amount of injected water into the spray to reduce the nO x in the exhaust gas. Further, since only the fuel remains in the portion where the high pressure acts on the fuel injection valve, it is possible to maintain the same durability as the conventional one.

【0016】[0016]

【発明の効果】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、従来は
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、水の注入量を大巾に増大
させても、中間で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。この結果、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排ガス中のNOx の大巾な低減
効果を得ることが可能であり、耐久性のある信頼性の高
いエンジンを提供することができる。
INDUSTRIAL APPLICABILITY According to the present invention, in a water injection diesel engine in which fuel and water are injected from the same fuel injection valve, water is injected intermediately in the past, but instead of this, fuel and water are injected in multiple layers. Therefore, even if the injection amount of water is greatly increased, the fuel is injected in multiple layers in the middle, so that combustion does not become unstable. As a result, it is possible to increase the water injection amount without causing combustion failure of the engine, and it is possible to obtain a great effect of reducing NO x in the exhaust gas in response to the increase in the water injection amount. A reliable and reliable engine can be provided.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施例に係る燃料・水噴射装置の構成
図。
FIG. 1 is a configuration diagram of a fuel / water injection device according to an embodiment of the present invention.

【図2】図1における電磁式水供給制御弁及び電磁式燃
料供給制御弁の作動状況説明図。
FIG. 2 is an explanatory view of operating states of an electromagnetic water supply control valve and an electromagnetic fuel supply control valve in FIG.

【図3】図1における燃料・噴射弁の構成詳細図。FIG. 3 is a detailed configuration diagram of a fuel / injection valve in FIG.

【図4】図1〜図3に関連しての燃料・水噴射状況説明
図。
FIG. 4 is an explanatory view of a fuel / water injection state related to FIGS. 1 to 3.

【図5】従来の技術による燃料・水噴射装置の構成図。FIG. 5 is a configuration diagram of a fuel / water injection device according to a conventional technique.

【図6】図5における燃料・噴射弁の構成詳細図。6 is a detailed configuration diagram of the fuel / injection valve in FIG.

【図7】図5,図6に関連しての燃料・水噴射状況説明
図。
FIG. 7 is an explanatory view of a fuel / water injection situation related to FIGS. 5 and 6;

【符号の説明】[Explanation of symbols]

1…燃料タンク、3…燃料噴射ポンプ、6…燃料吐出
弁、7…逆止調圧弁、8…燃料噴射管、13…逆止弁、
15…水供給管(噴射弁側)、16…電磁式水供給制御
弁、17…水供給管(ポンプ側)、18…水供給ポン
プ、19…水タンク、20…コントロール装置、21…
給水流入路、22…燃料通路(第1)、23…回線、3
1…合流部、40…燃料噴射弁、115…燃料供給管
(噴射弁側)、116…電磁式燃料供給制御弁、117
…燃料供給管(ポンプ側)、118…燃料加圧ポンプ、
121…燃料通路(第2)、131…合流部、230…
逆止弁下流通路。
DESCRIPTION OF SYMBOLS 1 ... Fuel tank, 3 ... Fuel injection pump, 6 ... Fuel discharge valve, 7 ... Check pressure regulating valve, 8 ... Fuel injection pipe, 13 ... Check valve,
15 ... Water supply pipe (injection valve side), 16 ... Electromagnetic water supply control valve, 17 ... Water supply pipe (pump side), 18 ... Water supply pump, 19 ... Water tank, 20 ... Control device, 21 ...
Water supply inflow passage, 22 ... Fuel passage (first), 23 ... Line, 3
DESCRIPTION OF SYMBOLS 1 ... Junction part, 40 ... Fuel injection valve, 115 ... Fuel supply pipe (injection valve side), 116 ... Electromagnetic fuel supply control valve, 117
... Fuel supply pipe (pump side), 118 ... Fuel pressurizing pump,
121 ... Fuel passage (second), 131 ... Confluence part, 230 ...
Check valve downstream passage.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 同一の燃料噴射弁(40)から燃料と水
をシリンダ内に噴射する水噴射ディーゼルエンジンにお
いて、燃料吐出弁の側路に逆止調圧弁(7)が設けられ
ている燃料噴射ポンプ(3)と、燃料と水を噴射する燃
料噴射弁(40)と、該燃料噴射弁内の第1の燃料通路
(22)と前記燃料噴射ポンプを連通する燃料噴射管
(8)と、燃料タンク(1)と前記燃料噴射弁内の第2
の燃料通路(121)を連通する第2の燃料供給管路
(117)、(115)と、水タンク(19)と前記燃
料噴射弁内の流入路(21)を連通する水供給管路(1
7)、(15)と、該水供給管路(15)と前記第2の
燃料供給管路(115)を夫々開閉制御する電磁式制御
弁(16)、(116)と、該電磁式制御弁を回線(2
3)を介して制御するコントロール装置(20)と、前
記燃料噴射弁内の水の流入路(21)と第2の燃料通路
(121)との合流部(131)の下流に設けられた逆
止弁(13)と、該逆止弁下流の通路(230)と前記
第1の燃料通路(22)とが合流する合流部(31)と
を有してなる水噴射ディーゼルエンジン。
1. A water injection diesel engine in which fuel and water are injected into a cylinder from the same fuel injection valve (40), and a check valve (7) is provided in a side passage of the fuel discharge valve. A pump (3), a fuel injection valve (40) for injecting fuel and water, a fuel injection pipe (8) for communicating the first fuel passage (22) in the fuel injection valve with the fuel injection pump, Fuel tank (1) and second in the fuel injection valve
Second fuel supply lines (117) and (115) communicating with the fuel passage (121) of the water supply line (21) communicating with the water tank (19) and the inflow path (21) in the fuel injection valve (21). 1
7), (15), electromagnetic control valves (16), (116) for controlling opening / closing of the water supply pipe (15) and the second fuel supply pipe (115), respectively, and the electromagnetic control. Valve to line (2
3), a control device (20) for controlling the fuel injection valve and a reverse part provided downstream of a confluence portion (131) of the water inflow passage (21) and the second fuel passage (121) in the fuel injection valve. A water injection diesel engine comprising a stop valve (13) and a merging portion (31) where the passage (230) downstream of the check valve and the first fuel passage (22) merge.
JP4114255A 1992-04-08 1992-04-08 Water injection diesel engine Expired - Fee Related JP2934552B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4114255A JP2934552B2 (en) 1992-04-08 1992-04-08 Water injection diesel engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4114255A JP2934552B2 (en) 1992-04-08 1992-04-08 Water injection diesel engine

Publications (2)

Publication Number Publication Date
JPH05288129A true JPH05288129A (en) 1993-11-02
JP2934552B2 JP2934552B2 (en) 1999-08-16

Family

ID=14633204

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4114255A Expired - Fee Related JP2934552B2 (en) 1992-04-08 1992-04-08 Water injection diesel engine

Country Status (1)

Country Link
JP (1) JP2934552B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0718489A1 (en) * 1994-12-23 1996-06-26 Wartsila Diesel International Ltd. OY Injection arrangement for an internal combustion engine
JP2019138238A (en) * 2018-02-13 2019-08-22 株式会社ジャパンエンジンコーポレーション Fuel injection device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0718489A1 (en) * 1994-12-23 1996-06-26 Wartsila Diesel International Ltd. OY Injection arrangement for an internal combustion engine
US5647316A (en) * 1994-12-23 1997-07-15 Wartsila Diesel International Ltd Oy Injection arrangement for an internal combustion engine
JP2019138238A (en) * 2018-02-13 2019-08-22 株式会社ジャパンエンジンコーポレーション Fuel injection device
WO2019159816A1 (en) * 2018-02-13 2019-08-22 株式会社ジャパンエンジンコーポレーション Fuel injection device
KR20200105719A (en) 2018-02-13 2020-09-08 가부시키가이샤 자판엔진코포레숀 Fuel injector

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