JP3219528B2 - Fuel / water stratified injection device - Google Patents
Fuel / water stratified injection deviceInfo
- Publication number
- JP3219528B2 JP3219528B2 JP06737793A JP6737793A JP3219528B2 JP 3219528 B2 JP3219528 B2 JP 3219528B2 JP 06737793 A JP06737793 A JP 06737793A JP 6737793 A JP6737793 A JP 6737793A JP 3219528 B2 JP3219528 B2 JP 3219528B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- fuel
- injection
- valve
- water supply
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 178
- 238000002347 injection Methods 0.000 title claims description 141
- 239000007924 injection Substances 0.000 title claims description 141
- 239000000446 fuel Substances 0.000 title claims description 112
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 8
- 239000003921 oil Substances 0.000 description 23
- 238000002485 combustion reaction Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 8
- 239000010720 hydraulic oil Substances 0.000 description 7
- 230000001186 cumulative effect Effects 0.000 description 2
- 239000008400 supply water Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Landscapes
- Fuel-Injection Apparatus (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はディーゼル機関に適用さ
れる燃料・水層状噴射装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel / water stratified injection device applied to a diesel engine.
【０００２】[0002]
【従来の技術】図４に従来技術による燃料・水層状噴射
装置の構成図を示す。図を参照してその構成について説
明する。図において、０１は燃料噴射ポンプ、０２は燃
料カム、０３はプランジャ、０４は吐出逆止弁、０５は
逆止調圧弁、０６は高圧油路、０７は燃料噴射弁、０８
は針弁、０９は燃料タンクである。０２０は高圧油路０
６の途中の燃料噴射弁０７近傍に儲けられた水注入部、
０２１は前記水注入部方向への流れのみが許容される水
注入逆止弁、０２２は注水用管路の電磁開閉弁、０２３
は水供給ポンプ、０２４は水タンク、０２５は燃料カム
０２の回転角度検出器０２６から信号を入力し、燃料カ
ムの回転角度に対応して電磁開閉弁０２２に開閉信号を
出力する制御装置である。逆止調圧弁０５と燃料噴射弁
の針弁０８および水注入逆止弁０２１の開弁圧をそれぞ
れＰP ，ＰO ，ＰW とするとき、これらの開弁圧につい
てはＰP ＜ＰW ＜ＰO となるように設定されている。2. Description of the Related Art FIG. 4 shows a configuration diagram of a conventional fuel / water stratified injection device. The configuration will be described with reference to the drawings. In the figure, 01 is a fuel injection pump, 02 is a fuel cam, 03 is a plunger, 04 is a discharge check valve, 05 is a check pressure regulating valve, 06 is a high pressure oil passage, 07 is a fuel injection valve, 08
Is a needle valve, and 09 is a fuel tank. 020 is high-pressure oil passage 0
A water injection section made near the fuel injection valve 07 in the middle of 6;
Reference numeral 021 denotes a water injection check valve that allows only the flow in the direction of the water injection section, 022 denotes an electromagnetic on-off valve of a water injection pipe, and 023.
Is a water supply pump, 024 is a water tank, 025 is a control device that inputs a signal from the rotation angle detector 026 of the fuel cam 02, and outputs an open / close signal to the electromagnetic on-off valve 022 corresponding to the rotation angle of the fuel cam 02. . When the valve opening pressures of the check pressure regulating valve 05, the needle valve 08 of the fuel injection valve, and the water injection check valve 021 are P P , P O , and P W , respectively, these valve opening pressures are P P <P W < PO is set.
【０００３】次にその作用について図５に示した作用説
明図を参照して説明する。燃料噴射ポンプ０１のプラン
ジャ０３が燃料の吐出を行っていない期間中に、これを
燃料カム０２の回転角として角度検出器０２６により検
出し、制御装置０２５を介して電磁開閉弁０２２に開弁
の信号が出力される。これにより電磁開閉弁０２２が開
弁すると、水供給ポンプ０２３によって水注入逆止弁０
２１の開弁圧ＰW 以上の圧力ＰS に加圧された水が電磁
開閉弁０２２および水注入逆止弁０２１を経て、水注入
部０２０から高圧油路０６内に注入される。このとき水
供給ポンプによる加圧水の圧力ＰS をＰW ＜ＰS ＜ＰO
としておくことにより、燃料噴射弁の針弁０８は開弁さ
れず、燃料噴射ポンプの逆止調圧弁０５が開弁されるた
め、水注入部０２０から高圧油路６内に注入された水は
燃料噴射ポンプ０１の方向に燃料を押しもどしながら流
入する。一定時間の後制御装置０２５からの閉弁信号に
より電磁開閉弁０２２が閉弁されると水の注入は停止さ
れる。この時点において高圧油路０６内には、燃料噴射
弁０７の針弁０８側から見て前サイクルの噴射で残留し
た燃料、水注入部０２０から注入した水、さらにその先
に押し戻された燃料の順序で層状に燃料と水が配されて
いる。Next, the operation will be described with reference to the operation explanatory diagram shown in FIG. During the period when the plunger 03 of the fuel injection pump 01 is not discharging fuel, this is detected by the angle detector 026 as the rotation angle of the fuel cam 02, and the electromagnetic opening / closing valve 022 is opened via the control device 025. A signal is output. As a result, when the electromagnetic on-off valve 022 opens, the water supply check valve 0
The water pressurized to a pressure P S equal to or higher than the valve opening pressure P W of 21 is injected into the high-pressure oil passage 06 from the water injection part 020 via the electromagnetic on-off valve 022 and the water injection check valve 21. At this time, the pressure P S of the pressurized water by the water supply pump is set to P W <P S <P O
By doing so, the needle valve 08 of the fuel injection valve is not opened and the check pressure regulating valve 05 of the fuel injection pump is opened, so that the water injected from the water injection section 020 into the high-pressure oil passage 6 is The fuel flows in the direction of the fuel injection pump 01 while pushing back the fuel. After a certain period of time, when the solenoid on-off valve 022 is closed by a valve-closing signal from the control device 025, the injection of water is stopped. At this time, the fuel remaining in the injection in the previous cycle as viewed from the needle valve 08 side of the fuel injection valve 07, the water injected from the water injection unit 020, and the fuel pushed back to the end thereof are located in the high pressure oil passage 06. Fuel and water are arranged in layers in order.
【０００４】続いて燃料カム０２が回転して燃料噴射ポ
ンプ０１のプランジャ０３の作動により燃料の吐出が開
始されると、高圧油路０６内の前記燃料および水は層状
に配された順、即ち燃料−水−燃料の順で燃料噴射弁０
７から噴射される。図示しないディーゼル機関のシリン
ダ内では、まず最初に噴射された燃料が着火燃焼し、続
いて噴射された水が燃焼温度の上昇を抑え、最後にその
燃焼域内に再度燃料が噴射される。この燃料と水の層状
噴射による燃焼によって着火性を損うことなくＮＯx な
どの発生を抑制したディーゼル燃焼を得ることができ
る。Subsequently, when the fuel cam 02 rotates and the discharge of fuel is started by the operation of the plunger 03 of the fuel injection pump 01, the fuel and water in the high-pressure oil passage 06 are arranged in a layered order, that is, Fuel injection valve 0 in the order of fuel-water-fuel
It is injected from 7. In a cylinder of a diesel engine (not shown), the first injected fuel ignites and combusts, the subsequently injected water suppresses a rise in combustion temperature, and finally the fuel is injected again into the combustion region. The by combustion with the fuel and water stratified injection can be obtained diesel combustion which suppresses the occurrence of NO x without impairing the ignition properties.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、従来技
術による燃料・水層状噴射装置では次のような問題点が
指摘されている。 （１）燃料−水−燃料の層状噴射において水の注入量が
増え水の噴射期間が長くなると、燃焼が途絶えることに
より円滑なディーゼル燃焼が行えなくなり、ディーゼル
ノックや不安定燃焼を引き起すことになる。その対応手
段としては水の層をさらに分割して多層状とした燃料・
水層状噴射とする必要がある。 （２）水の注入量は電磁開閉弁の開弁時間によって規制
されるが、燃料と水とを合算した合計噴射量は燃料噴射
ポンプの機能設定により規制された一定量が噴射され
る。このため電磁開閉弁の作動時間のばらつきなどによ
り水の注入量が変化すると、噴射される燃料の量が変化
し、ガバニング不良やサイクル変動の増大を引き起すこ
とになる。特に（１）項で述べた多層状に分割して水を
注入する場合には、電磁開閉弁の作動時間の誤差が累積
されて大きなばらつきとなるために、水注入の合計量が
一定量となるよう的確に制御することが必要となる。However, the following problems have been pointed out in the fuel / water stratified injection device according to the prior art. (1) In the fuel-water-fuel stratified injection, when the injection amount of water is increased and the injection period of water is lengthened, smooth combustion of the diesel fuel cannot be performed due to interruption of the combustion, and diesel knock or unstable combustion is caused. Become. To cope with this problem, the water layer is further divided into multilayer fuels.
Water stratified injection is required. (2) The injection amount of water is regulated by the valve opening time of the electromagnetic on-off valve, and the total injection amount obtained by adding the fuel and water is a fixed amount regulated by the function setting of the fuel injection pump. Therefore, if the amount of injected water changes due to variations in the operation time of the electromagnetic on-off valve, the amount of injected fuel changes, which causes poor governing and increased cycle fluctuation. In particular, in the case of injecting water in a multi-layered manner as described in the item (1), since errors in the operation time of the solenoid on-off valve are accumulated and greatly vary, the total amount of water injection is a certain amount. It is necessary to control precisely.
【０００６】本発明の目的は前記問題点を解決し、水の
噴射量を増量した場合でも、燃焼不良を招来することな
く安定した機関内燃焼が維持でき、ＮＯx などの発生を
大幅に低減し得る燃料・水層状噴射装置を提供するにあ
る。An object of the present invention is to solve the above problems, even when increasing the injection quantity of water, a stable engine the combustion can be maintained without causing poor combustion, greatly reduce the occurrence of NO x And a stratified fuel / water injection device.
【０００７】[0007]
【課題を解決するための手段】本発明の燃料・水層状噴
射装置は、ディーゼル機関の燃料・水層状噴射装置にお
いて、燃料噴射ポンプ（１）の燃料吐出部に吐出逆止弁
と並設され燃料の逆流が許容される逆止調圧弁（５）
と、前記燃料噴射ポンプから燃料噴射弁（７）に連通す
る高圧油路（６）の途中に配設された複数の水注入部
（２０ａ，２０ｂ）と、供給水を所定の水圧まで加圧し
て前記水注入部（２０ａ，２０ｂ）に送給する水供給ピ
ストン（３１）を備えるとともに該水供給ピストン（３
１）のストロークを制限して前記水注入部（２０ａ，２
０ｂ）への総供給水量を規制するストッパ手段（３４，
３５）を備えた水供給装置（３０）と、該水供給装置
（３０）と前記複数の水注入部（２０ａ，２０ｂ）とを
連通する複数の管路に前記水注入部（２０ａ，２０ｂ）
から順に介装された水注入逆止弁（２１ａ，２１ｂ）並
びに電磁開閉弁（２２ａ，２２ｂ）と、前記燃料噴射ポ
ンプ（１）の作動に対応して前記水注入部（２０ａ，２
０ｂ）への水注入時期を規制すべく前記電磁開閉弁（２
２ａ，２２ｂ）及び前記水供給装置（３０）の電磁三方
弁（３７）に制御信号を出力する制御装置（２５）とを
有してなり、前記逆止調圧弁（５）、燃料噴射弁（７）
の針弁（８）及び前記水注入逆止弁（２１ａ，２１ｂ）
の開弁圧力をそれぞれＰP，ＰO，ＰWとするとき、ＰP＜
ＰW＜ＰOとなるように設定され、且つ前記電磁開閉弁
（２２ａ，２２ｂ）は前記高圧油路（６）において前記
燃料噴射ポンプ（１）に近い側の水注入部（２０ａ，２
０ｂ）に対応するものから順に開閉されることにより、
前記燃料噴射ポンプ（１）から燃料の吐出が行われてい
ない期間中に前記水供給装置（３０）を介して前記複数
の水注入部（２０ａ，２０ｂ）から前記高圧油路（６）
内に水を注入して燃料と水の多層状液柱を形成し、前記
燃料噴射ポンプ（１の燃料吐出時に燃料と水を層状にし
て同じ時期に順次燃料噴射弁（７）から噴射させるよう
に構成したことを特徴とする。A stratified fuel / water injection device according to the present invention is provided in a stratified fuel / water injection device for a diesel engine, and is arranged in parallel with a discharge check valve at a fuel discharge portion of a fuel injection pump (1). Non-return pressure regulating valve allowing backflow of fuel (5)
A plurality of water injection portions (20a, 20b) disposed in the middle of a high-pressure oil passage (6) communicating with the fuel injection valve (7) from the fuel injection pump, and pressurizing the supply water to a predetermined water pressure. A water supply piston (31) for feeding the water supply section (20a, 20b) with the water supply piston (3).
1) The stroke of the water injection section (20a, 2
0b), stopper means (34,
35), and a plurality of pipes communicating the water supply device (30) with the plurality of water injection sections (20a, 20b). The water injection sections (20a, 20b).
The water injection check valves (21a, 21b) and the electromagnetic on / off valves (22a, 22b) interposed in this order from the above and the water injection section (20a, 2) corresponding to the operation of the fuel injection pump (1).
0b) to regulate the timing of water injection into the solenoid on-off valve (2).
2a, 22b) and a control device (25) for outputting a control signal to the electromagnetic three-way valve (37) of the water supply device (30). The check pressure regulating valve (5), the fuel injection valve ( 7)
Needle valve (8) and the water injection check valve (21a, 21b)
When the valve opening pressures of the valves are P P , P O , and P W , respectively, P P <
P W <P O , and the solenoid on-off valves (22a, 22b) are connected to the water injection sections (20a, 2) on the high pressure oil passage (6) on the side closer to the fuel injection pump (1).
By opening and closing in order from the one corresponding to 0b),
During a period in which fuel is not being discharged from the fuel injection pump (1), the plurality of water injection units (20a, 20b) are connected to the high-pressure oil passage (6) via the water supply device (30).
Water is injected into the fuel injection pump to form a multi-layer liquid column of fuel and water, and the fuel and water are stratified when the fuel is injected from the fuel injection pump (1) and sequentially injected from the fuel injection valve (7) at the same time. It is characterized by having comprised in .
【０００８】[0008]
【作用】燃料噴射ポンプ１から燃料の吐出が行われてい
ない期間中に、燃料噴射ポンプ１から燃料噴射弁７に至
る高圧油路６に設けられた複数の水注入部２０ａと２０
ｂのうち、まず燃料噴射ポンプ１に最も近い部位の第１
の水注入部２０ａに対応する第１の電磁開閉弁２２ａが
開弁され、容積制限式の水供給装置３０から加圧された
水が電磁開閉弁２２ａ、水注入逆止弁２１ａおよび水注
入部２０ａを経て高圧油路６内に注入される。このと
き、水供給装置３０の圧送圧力ＰS と、水注入逆止弁２
１ａの開弁圧ＰW と、燃料噴射弁の針弁８の開弁圧ＰO
と、燃料噴射ポンプの逆止調圧弁５の開弁圧ＰP との間
にはＰP ＜ＰW ＜ＰS ＜ＰO の関係があるので、注入さ
れた水は第１の水注入部２０ａから上流の燃料噴射ポン
プ１側に燃料を押し戻しながら流入する。A plurality of water injection portions provided in the high-pressure oil passage from the fuel injection pump to the fuel injection valve during a period in which fuel is not discharged from the fuel injection pump.
b, the first of the parts closest to the fuel injection pump 1
The first electromagnetic on / off valve 22a corresponding to the water injection unit 20a is opened, and the water pressurized from the water supply device 30 of the volume limited type is supplied with the electromagnetic on / off valve 22a, the water injection check valve 21a, and the water injection unit. It is injected into the high-pressure oil passage 6 via 20a. In this case, the pumping pressure P S of the water supply apparatus 30, water injection check valve 2
A valve opening pressure P W of 1a, valve opening pressure P O of the needle valve 8 of the fuel injection valve
When, because there is a relation of P P <P W <P S <P O between the valve-opening pressure P P of the check regulator valve 5 of the fuel injection pump, injected water first water injection section The fuel flows from 20a into the fuel injection pump 1 upstream while pushing back the fuel.
【０００９】一定時間の水注入の後に第１の電磁開閉弁
２２ａが閉弁され、続いて第２順位で燃料噴射ポンプ１
に近い部位に配された第２の水注入部２０ｂに対応する
第２の電磁開閉弁２２ｂが開弁され、第１の水注入部２
０ａと同様にして第２の水注入部２０ｂから第２の電磁
開閉弁２２ｂの開弁時間に対応した一定量の水が上流側
に流入する。配設した複数個の水注入部の数だけ前記の
作用が繰返されると、高圧油路６内には燃料噴射弁７側
から燃料−水−燃料−水…燃料の順による多層状の液柱
が形成される。After a certain period of water injection, the first solenoid on-off valve 22a is closed, and then the fuel injection pump 1 in the second order.
The second electromagnetic on-off valve 22b corresponding to the second water injection part 20b arranged at a position close to the first water injection part 2b is opened, and the first water injection part 2b is opened.
As in the case of 0a, a certain amount of water corresponding to the opening time of the second solenoid on-off valve 22b flows from the second water injection part 20b to the upstream side. When the above operation is repeated by the number of the plurality of water injection portions disposed, a multi-layered liquid column is formed in the high-pressure oil passage 6 from the fuel injection valve 7 side in the order of fuel-water-fuel-water... Is formed.
【００１０】なお、高圧油路６内への注水に際し、燃料
噴射ポンプ１から最も離れて設けられた最終注水順位の
水注入部からの水注入量は、容積制限式の水供給装置３
０の水供給ピストン３１の作動行程が完結しストローク
制限値に達している必要があるので、最終順位で作動す
る電磁開閉弁が開弁している期間は十分に時間的余裕を
もった期間に設定されている。高圧油路６内に燃料と水
の多層液柱が形成されてから燃料噴射ポンプ１の吐出が
行われると燃料噴射弁７から燃料−水−燃料−水…燃料
の順による多層状の燃料と水の噴射が行われる。When water is injected into the high-pressure oil passage 6, the amount of water injected from the water injection section of the last water injection order provided furthest from the fuel injection pump 1 is determined by the volume-limited water supply device 3.
Since the operation stroke of the water supply piston 31 of 0 needs to be completed and the stroke limit value has been reached, the period during which the solenoid on-off valve that operates in the final order is open is a period with sufficient time margin. Is set. When the fuel injection pump 1 is discharged after the multi-layer liquid column of fuel and water is formed in the high-pressure oil passage 6, the multi-layer fuel in the order of fuel-water-fuel-water... Water injection is performed.
【００１１】その結果、大量の水注入が行われても、水
が多層に分割されて噴射されるため、燃焼が途切れるこ
とによる不安定燃焼やディーゼルノックが発生しない。
また、複数の水注入部対応の電磁制御弁による水注入期
間の累積誤差が生じても、総計した水注入量は容積制限
式の水供給装置３０の水供給ピストン３１のストローク
によって規制される水量を限度としているため、燃料噴
射ポンプによって噴射される燃料と水との合計噴射量が
一定であっても、燃料の噴射量についてサイクル毎の増
減はなく、ガバニング不良や燃焼のサイクル変動を起す
こともない。As a result, even if a large amount of water is injected, since water is divided into multiple layers and injected, unstable combustion or diesel knock due to interruption of combustion does not occur.
In addition, even if a cumulative error occurs in the water injection period caused by the electromagnetic control valves corresponding to the plurality of water injection units, the total water injection amount is controlled by the stroke of the water supply piston 31 of the volume-limited water supply device 30. Therefore, even if the total injection amount of fuel and water injected by the fuel injection pump is constant, there is no increase or decrease in the fuel injection amount every cycle, causing poor governing or combustion cycle fluctuation. Nor.
【００１２】[0012]
【実施例】図１に本発明の実施例に係る燃料・水層状噴
射装置の構成図を示す。図１を参照してその構成につい
て説明する。なお、図１の実施例と図４で示した従来例
において、実施例での符号１〜９は従来例での０１〜０
９と同一部分であり、実施例での符号２０〜２５は従来
例での０２０〜０２５と同一部分である。これらについ
ては名称と機能が同じであるから説明を省略する。図１
で水注入部２０ａと２０ｂ、水注入逆止弁２１ａと２１
ｂ、電磁開閉弁２２ａと２２ｂについては、第１系統を
ａとし第２系統をｂとして２組が配設されているが、２
組以上の複数組としてもよい。FIG. 1 shows a configuration diagram of a fuel / water stratified injection device according to an embodiment of the present invention. The configuration will be described with reference to FIG. In the embodiment of FIG. 1 and the conventional example shown in FIG. 4, reference numerals 1 to 9 in the embodiment are 01 to 0 in the conventional example.
Reference numerals 20 to 25 in the embodiment are the same as those of 020 to 025 in the conventional example. Since these have the same names and functions, description thereof will be omitted. FIG.
And water injection parts 20a and 20b, and water injection check valves 21a and 21
b, two sets of the solenoid on-off valves 22a and 22b are arranged with the first system being a and the second system being b,
There may be more than one set.
【００１３】３０は水供給装置で、供給水を所定の水圧
まで加圧して前記水注入部（２０ａ，２０ｂ）に送給す
る水供給ピストン３１、水圧送室３２、作動油室３３、
前記水供給ピストン３１のストロークを制限して前記水
注入部（２０ａ，２０ｂ）への総供給水量を規制する制
限ストッパ３４およびその制御装置３５より構成されて
いる。水圧送室３２は、一方の側は水供給逆止弁２７を
介して水供給ポンプ２３と水タンク２４に連通され、ま
た他方の側は電磁開閉弁２２ａ，２２ｂと水注入逆止弁
２１ａ，２１ｂを介して水注入部２０ａ，２０ｂに連通
されている。また、作動油室３３には、作動油タンク３
６からポンプによって加圧された作動油が電磁三方弁３
７を介して供給される。電磁三方弁３７の切換えは電磁
切換装置３８によって行われ、該切換装置３８は制御装
置２５によって制御される。Reference numeral 30 denotes a water supply device, which is a water supply piston 31 for pressurizing supply water to a predetermined water pressure and supplying the water to the water injection portions (20a, 20b), a water pressure supply chamber 32, a hydraulic oil chamber 33,
The water supply piston 31 includes a restriction stopper 34 for restricting a stroke of the water supply piston 31 to restrict a total supply amount of water to the water injection portions (20a, 20b), and a control device 35 thereof. One side of the water pressure feed chamber 32 communicates with the water supply pump 23 and the water tank 24 via the water supply check valve 27, and the other side has electromagnetic on-off valves 22a and 22b and the water injection check valve 21a, It is connected to the water injection parts 20a and 20b via 21b. The hydraulic oil chamber 33 has a hydraulic oil tank 3.
Hydraulic oil pressurized by a pump from 6 is an electromagnetic three-way valve 3
7. Switching of the electromagnetic three-way valve 37 is performed by the electromagnetic switching device 38, it said changeover switching device 38 is controlled by the control device 25.
【００１４】図２は実施例についての作用説明図で、図
３は高圧油路６内における燃料・水多層液柱の構成説明
図である。図２および図３を参照して実施例の作用につ
いて説明する。制御装置２５からの制御信号により電磁
切換装置３８が制御され、水供給装置３０の電磁三方弁
３７が作動して作動油室３３への通路が開となると、作
動油タンク３６から供給された作動油の圧力が作動油室
３３内に作用する。FIG. 2 is a diagram for explaining the operation of the embodiment, and FIG. 3 is a diagram for explaining the configuration of the fuel / water multilayer liquid column in the high-pressure oil passage 6. The operation of the embodiment will be described with reference to FIGS. When the electromagnetic switching device 38 is controlled by the control signal from the control device 25 and the electromagnetic three-way valve 37 of the water supply device 30 is operated to open the passage to the hydraulic oil chamber 33, the operation supplied from the hydraulic oil tank 36 is performed. The oil pressure acts in the working oil chamber 33.
【００１５】第１の電磁開閉弁２２ａが開となると水供
給ピストン３１は上昇し水圧送室３２から水が圧送さ
れ、第１水注入系統の電磁開閉弁２２ａと水注入逆止弁
２１ａを介して、第１の水注入部２０ａから高圧油路６
内に燃料噴射ポンプ側へ燃料を押し戻しつつ注水され
る。（図３（Ａ）参照） 第１の電磁開閉弁２２ａが閉じられ、引続いて第２の電
磁開閉弁２２ｂが開とされると、水供給ピストン３１は
再び上昇し、第１水注入系統での水の供給と同様にし
て、第２水注入系統の水注入部２０ｂから高圧油路６内
に注水される。このとき、先に第１の水注入部２０ａか
ら注入された水も燃料と共に燃料噴射ポンプ側へ押し戻
される。（図３（Ｂ）参照）When the first solenoid on-off valve 22a is opened, the water supply piston 31 rises and water is pumped from the water pressure feed chamber 32, and is supplied via the solenoid on-off valve 22a of the first water injection system and the water injection check valve 21a. From the first water injection section 20a to the high pressure oil passage 6
Water is injected while pushing fuel back to the fuel injection pump side. (Refer to FIG. 3 (A).) When the first electromagnetic on-off valve 22a is closed and the second electromagnetic on-off valve 22b is subsequently opened, the water supply piston 31 rises again and the first water injection system. The water is injected into the high-pressure oil passage 6 from the water injection part 20b of the second water injection system in the same manner as the supply of water in the above. At this time, the water previously injected from the first water injection part 20a is also pushed back to the fuel injection pump side together with the fuel. (See FIG. 3B)
【００１６】図２の作用説明図に見られるように、第２
の電磁開閉弁が閉とされるよりも前のタイミングで水供
給ピストン３１は制限ストッパ３４に当接して第２水注
入は終了となり、燃料噴射ポンプ側から燃料−水−燃料
−水−燃料の順に多層液柱が高圧油路６内に形成され
る。（図３（Ｃ）参照） 次に電磁三方弁３７が閉じの
方向、即ちドレン側に制御されると水供給ピストン３１
は水供給ポンプ２３からの給水圧力により、補給水を水
圧送室３２内へ導きながら下降し初期状態の位置に復帰
する。その後、燃料噴射ポンプ１の吐出の作動により高
圧油路６内の燃料・水の多層液柱は燃料噴射弁７からシ
リンダ内へ多層状に噴射される。As can be seen in the operation explanatory diagram of FIG.
The water supply piston 31 comes into contact with the limit stopper 34 at a timing before the electromagnetic on / off valve is closed, and the second water injection is completed, and the fuel-water-fuel-water-fuel In order, a multilayer liquid column is formed in the high-pressure oil passage 6. (See FIG. 3C.) Next, when the electromagnetic three-way valve 37 is controlled in the closing direction, that is, in the drain side, the water supply piston 31 is controlled.
With the supply pressure from the water supply pump 23, the makeup water descends while being guided into the water pressure feeding chamber 32, and returns to the initial position. Thereafter, the multi-layer liquid column of fuel and water in the high-pressure oil passage 6 is injected in a multi-layer form from the fuel injection valve 7 into the cylinder by the discharge operation of the fuel injection pump 1.
【００１７】[0017]
【発明の効果】本発明の燃料・水多層噴射装置により次
の効果が得られる。第１に、多量の水注入を行った場合
でも、水を噴射している期間が分断され燃料と水が交互
に繰返して噴射されることによって、機関内での燃焼が
途切れることなく、不安定燃焼やディーゼルノックを引
き起すことがない。第２に、注入される水の合計量は、
電磁開閉弁の作動時間の累積誤差が大きくなったとして
も、水供給ピストンのストローク制限による容積制限式
の水供給装置によって一定量に規制されるため、燃料の
噴射量についてサイクル毎のばらつきがなく、ガバニン
グ不良や燃焼のサイクル変動の増大を招来することがな
い。従って安定した機関内燃焼を維持しながらＮＯx な
どの発生を大幅に低減することができる。According to the fuel / water multilayer injection device of the present invention, the following effects can be obtained. First, even when a large amount of water is injected, the period during which water is injected is divided and fuel and water are alternately and repeatedly injected, so that combustion in the engine is not interrupted and unstable. Does not cause combustion or diesel knock. Second, the total amount of water injected is
Even if the cumulative error in the operation time of the solenoid on-off valve becomes large, the volume is limited to a fixed amount by the water supply device of the volume limited type by restricting the stroke of the water supply piston. It does not cause poor governing or increase in cycle variation of combustion. Therefore it is possible to greatly reduce the occurrence of NO x while maintaining stable engine the combustion.
【図１】本発明の実施例に係る燃料・水層状噴射装置の
構成図FIG. 1 is a configuration diagram of a fuel / water stratified injection device according to an embodiment of the present invention.
【図２】図１の構成による燃料・水層状噴射装置の作用
説明図。FIG. 2 is an operation explanatory view of the fuel / water stratified injection device having the configuration of FIG. 1;
【図３】図１における高圧油路内での燃料・水多層液柱
の構成説明図FIG. 3 is a configuration explanatory view of a fuel / water multilayer liquid column in a high-pressure oil passage in FIG. 1;
【図４】従来技術による燃料・水層状噴射装置の構成図FIG. 4 is a configuration diagram of a conventional fuel / water stratified injection device.
【図５】従来技術による燃料・水層状噴射装置の作用説
明図FIG. 5 is an explanatory view of the operation of the fuel / water stratified injection device according to the prior art.
１…燃料噴射ポンプ、２…燃料カム、３…プランジャ、
４…吐出逆止弁、５…逆止調圧弁、６…高圧油路、７…
燃料噴射弁、８…針弁、２０ａ，２０ｂ…水注入部、２
１ａ，２１ｂ…水注入逆止弁、２２ａ，２２ｂ…電磁開
閉弁、２５…制御装置、３０…水供給装置、３１…水供
給ピストン、３２…水圧送室、３３…作動油室、３４…
制限ストッパ、３７…電磁三方弁。1. Fuel injection pump 2. Fuel cam 3. Plunger
4: discharge check valve, 5: check pressure regulating valve, 6: high pressure oil passage, 7:
Fuel injection valve, 8: needle valve, 20a, 20b: water injection section, 2
1a, 21b: water injection check valve, 22a, 22b: electromagnetic on-off valve, 25: control device, 30: water supply device, 31: water supply piston, 32: water pressure feed chamber, 33: hydraulic oil chamber, 34 ...
Limiting stopper, 37 ... three-way solenoid valve.
フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) F02M 43/00 F02M 43/02 F02M 43/04 F02M 25/022 Continuation of the front page (58) Field surveyed (Int. Cl. 7 , DB name) F02M 43/00 F02M 43/02 F02M 43/04 F02M 25/022
Claims (1)
において、燃料噴射ポンプ（１）の燃料吐出部に吐出逆
止弁と並設され燃料の逆流が許容される逆止調圧弁
（５）と、前記燃料噴射ポンプから燃料噴射弁（７）に
連通する高圧油路（６）の途中に配設された複数の水注
入部（２０ａ，２０ｂ）と、供給水を所定の水圧まで加
圧して前記水注入部（２０ａ，２０ｂ）に送給する水供
給ピストン（３１）を備えるとともに該水供給ピストン
（３１）のストロークを制限して前記水注入部（２０
ａ，２０ｂ）への総供給水量を規制するストッパ手段
（３４，３５）を備えた水供給装置（３０）と、該水供
給装置（３０）と前記複数の水注入部（２０ａ，２０
ｂ）とを連通する複数の管路に前記水注入部（２０ａ，
２０ｂ）から順に介装された水注入逆止弁（２１ａ，２
１ｂ）並びに電磁開閉弁（２２ａ，２２ｂ）と、前記燃
料噴射ポンプ（１）の作動に対応して前記水注入部（２
０ａ，２０ｂ）への水注入時期を規制すべく前記電磁開
閉弁（２２ａ，２２ｂ）及び前記水供給装置（３０）の
電磁三方弁（３７）に制御信号を出力する制御装置（２
５）とを有してなり、前記逆止調圧弁（５）、燃料噴射
弁（７）の針弁（８）及び前記水注入逆止弁（２１ａ，
２１ｂ）の開弁圧力をそれぞれＰP，ＰO，ＰWとすると
き、ＰP＜ＰW＜ＰOとなるように設定され、且つ前記電
磁開閉弁（２２ａ，２２ｂ）は前記高圧油路（６）にお
いて前記燃料噴射ポンプ（１）に近い側の水注入部（２
０ａ，２０ｂ）に対応するものから順に開閉されること
により、前記燃料噴射ポンプ（１）から燃料の吐出が行
われていない期間中に前記水供給装置（３０）を介して
前記複数の水注入部（２０ａ，２０ｂ）から前記高圧油
路（６）内に水を注入して燃料と水の多層状液柱を形成
し、前記燃料噴射ポンプ（１の燃料吐出時に燃料と水を
層状にして同じ時期に順次燃料噴射弁（７）から噴射さ
せるように構成したことを特徴とする燃料・水層状噴射
装置。1. A fuel / water stratified injection device for a diesel engine, comprising: a check pressure regulating valve (5) arranged in parallel with a discharge check valve at a fuel discharge portion of a fuel injection pump (1) to allow backflow of fuel. A plurality of water injection portions (20a, 20b) disposed in the middle of a high-pressure oil passage (6) communicating from the fuel injection pump to a fuel injection valve (7); water supply piston provided with a said water injection unit (20a, 20b) feeding the Kyusuru water supply piston (31)
By limiting the stroke of (31), the water injection section (20
a, stopper means for regulating the total amount of water supplied to
A water supply device (30) provided with (34, 35) ; the water supply device (30); and the plurality of water injection portions (20a, 20).
b) into a plurality of conduits communicating with the water injection section (20a,
20b), the water injection check valves (21a, 2
1b) and the solenoid valve and (22a, 22b), the water injection unit in response to operation of the fuel injection pump (1) (2
The control device (2) which outputs a control signal to the electromagnetic on-off valves (22a, 22b) and the electromagnetic three-way valve (37) of the water supply device (30) in order to regulate the timing of water injection into the water supply device (0a, 20b).
5), the check pressure regulating valve (5), the needle valve (8) of the fuel injection valve (7), and the water injection check valve (21a,
Each P P a opening pressure of 21b), P O, when the P W, is set to be P P <P W <P O , and the electromagnetic on-off valve (22a, 22b) is the high pressure oil passage In (6), the water injection section (2) on the side near the fuel injection pump (1)
0a, 20b), the plurality of water injections are performed via the water supply device (30) during a period in which fuel is not discharged from the fuel injection pump (1). Water is injected into the high-pressure oil passage (6) from the portions (20a, 20b) to form a multi-layer liquid column of fuel and water, and the fuel and water are layered when the fuel injection pump (1 discharges fuel). A stratified fuel / water injection device characterized by being sequentially injected from a fuel injection valve (7) at the same time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06737793A JP3219528B2 (en) | 1993-03-04 | 1993-03-04 | Fuel / water stratified injection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06737793A JP3219528B2 (en) | 1993-03-04 | 1993-03-04 | Fuel / water stratified injection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06257530A JPH06257530A (en) | 1994-09-13 |
| JP3219528B2 true JP3219528B2 (en) | 2001-10-15 |
Family
ID=13343267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06737793A Expired - Lifetime JP3219528B2 (en) | 1993-03-04 | 1993-03-04 | Fuel / water stratified injection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3219528B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6313580B1 (en) | 1998-04-14 | 2001-11-06 | Nec Corporation | AC-discharge type plasma display panel and method for driving the same |
| US7659870B2 (en) | 1999-12-16 | 2010-02-09 | Lg Electronics Inc. | Method of driving plasma display panel |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6285699B2 (en) * | 2013-11-26 | 2018-02-28 | 川崎重工業株式会社 | Ship engine system and ship using pilot fuel |
| 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 |
| JP6940548B2 (en) * | 2019-04-24 | 2021-09-29 | 株式会社ジャパンエンジンコーポレーション | Marine diesel engine |
| JP7465634B2 (en) * | 2019-06-14 | 2024-04-11 | 株式会社ジャパンエンジンコーポレーション | Marine Diesel Engines |
-
1993
- 1993-03-04 JP JP06737793A patent/JP3219528B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6313580B1 (en) | 1998-04-14 | 2001-11-06 | Nec Corporation | AC-discharge type plasma display panel and method for driving the same |
| US6496167B2 (en) | 1998-04-14 | 2002-12-17 | Nec Corporation | AC-discharge type plasma display panel and method for driving the same |
| US7659870B2 (en) | 1999-12-16 | 2010-02-09 | Lg Electronics Inc. | Method of driving plasma display panel |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06257530A (en) | 1994-09-13 |
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