JPH0868368A - Pressure accumulation type fuel injection device - Google Patents
Pressure accumulation type fuel injection deviceInfo
- Publication number
- JPH0868368A JPH0868368A JP6226044A JP22604494A JPH0868368A JP H0868368 A JPH0868368 A JP H0868368A JP 6226044 A JP6226044 A JP 6226044A JP 22604494 A JP22604494 A JP 22604494A JP H0868368 A JPH0868368 A JP H0868368A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- common rail
- fuel injection
- injection device
- holding
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
- F02M63/0275—Arrangement of common rails
- F02M63/0285—Arrangement of common rails having more than one common rail
- F02M63/029—Arrangement of common rails having more than one common rail per cylinder bank, e.g. storing different fuels or fuels at different pressure levels per cylinder bank
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
- F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
- F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/60—Fuel-injection apparatus having means for facilitating the starting of engines, e.g. with valves or fuel passages for keeping residual pressure in common rails
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は蓄圧式燃料噴射装置にか
かるもので、とくにコモンレール内における燃料圧力の
迅速な制御を可能とする蓄圧式燃料噴射装置に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-accumulation type fuel injection device, and more particularly to a pressure-accumulation type fuel injection device which enables rapid control of fuel pressure in a common rail.
【０００２】[0002]
【従来の技術】従来の電子制御式燃料噴射装置１につい
て図２および図３にもとづき概説する。図２は、電子制
御式燃料噴射装置１の概略説明図であって、電子制御式
燃料噴射装置１は、燃料供給ポンプ２と、コモンレール
（高圧蓄圧器）３と、コモンレール３に接続した複数本
の燃料噴射管４と、それぞれの燃料噴射管４に接続した
インジェクター５と、圧力センサー６と、制御手段７
と、を有する。2. Description of the Related Art A conventional electronically controlled fuel injection system 1 will be outlined with reference to FIGS. FIG. 2 is a schematic explanatory view of the electronically controlled fuel injection device 1, and the electronically controlled fuel injection device 1 includes a fuel supply pump 2, a common rail (high pressure accumulator) 3, and a plurality of units connected to the common rail 3. Fuel injection pipes 4, injectors 5 connected to the respective fuel injection pipes 4, pressure sensors 6, and control means 7
And.
【０００３】制御手段７は、圧力センサー６からの燃料
圧力信号、ならびにエンジンの負荷信号、エンジンシリ
ンダーの判別信号、エンジン回転数信号およびクランク
角信号、そのほか気温、大気圧、燃料温度など各種の条
件信号８に応じて燃料供給ポンプ２の駆動することによ
りコモンレール３内の燃料圧力を一定に保持するととも
に、インジェクター５の噴口９を開閉することにより燃
料を噴射する。The control means 7 controls the fuel pressure signal from the pressure sensor 6, the engine load signal, the engine cylinder discrimination signal, the engine speed signal and the crank angle signal, and various other conditions such as temperature, atmospheric pressure and fuel temperature. The fuel pressure in the common rail 3 is kept constant by driving the fuel supply pump 2 according to the signal 8, and the fuel is injected by opening and closing the injection port 9 of the injector 5.
【０００４】こうした構成の電子制御式燃料噴射装置１
においては、インジェクター５の噴口９の開閉時に大き
な圧力変動が生ずるため、インジェクター５に近い高圧
の燃料供給通路の途中にコモンレール３を設けて、燃料
の体積弾性により燃料圧力の変動を吸収可能としてい
る。The electronically controlled fuel injection device 1 having such a configuration
In the above, since a large pressure fluctuation occurs when the injection port 9 of the injector 5 is opened and closed, the common rail 3 is provided in the middle of the high-pressure fuel supply passage near the injector 5 so that the fluctuation of the fuel pressure can be absorbed by the volume elasticity of the fuel. .
【０００５】また、電子制御式燃料噴射装置１では、エ
ンジンの回転数や負荷とは独立に燃料噴射圧を自由に設
定することができる。すなわち、燃料噴射圧を低圧から
高圧に変化させるためには、燃料供給ポンプ２内のポン
プコントロールバルブ（図示せず）を閉弁させることに
より燃料をコモンレール３側に吐出して圧送するだけ
で、わずか数回の圧送によってコモンレール３の圧力を
昇圧することができる。Further, in the electronically controlled fuel injection device 1, the fuel injection pressure can be freely set independently of the engine speed and the load. That is, in order to change the fuel injection pressure from low pressure to high pressure, the pump control valve (not shown) in the fuel supply pump 2 is closed to discharge the fuel to the common rail 3 side and pump it. The pressure of the common rail 3 can be increased by pumping only a few times.
【０００６】しかしながら、燃料噴射圧を高圧から低圧
に変化させる場合には、その低圧化手段としては、イン
ジェクター５からの燃料噴射しかないため、この燃料噴
射量の分しか圧力が低下していかないという問題があ
る。すなわち、コモンレール３圧の変化量△Ｐｃは、 △Ｐｃ＝Ｅ・燃料噴射量・噴射回数／Ｖｃ 式（１） ただし、Ｅは燃料の弾性係数、Ｖｃはコモンレール３の
デッドボリュームである。However, when the fuel injection pressure is changed from a high pressure to a low pressure, the only means for lowering the pressure is to inject fuel from the injector 5, so that the pressure is reduced only by this fuel injection amount. There's a problem. That is, the change amount ΔPc of the common rail 3 pressure is ΔPc = E · fuel injection amount · injection number / Vc formula (1) where E is the elastic coefficient of fuel and Vc is the dead volume of the common rail 3.
【０００７】したがって、たとえば図３の実線で示すよ
うに、高圧全噴射量から低圧微少噴射量まで急速に燃料
圧力を変化させたい場合に、たとえばトルク点（たとえ
ばコモンレール圧が１２０ＭＰａ、噴射量が２００ｍｍ
3／ｓｔ）から急激にアイドリング（コモンレール圧が
３０ＭＰａ、噴射量が１０ｍｍ3／ｓｔ）まで変化させ
る場合には、コモンレール圧は各インジェクター５から
の噴射量分しか圧力が低下しないので、所定の圧力まで
低下するために多大の噴射回数を必要とするため、結局
時間がかかってしまい、この間のエンジン過渡特性が非
常に悪化するという問題がある。Therefore, for example, as shown by the solid line in FIG. 3, when it is desired to rapidly change the fuel pressure from the high-pressure total injection amount to the low-pressure minute injection amount, for example, a torque point (for example, common rail pressure is 120 MPa, injection amount is 200 mm).
(3 / st) rapidly changes from idling (common rail pressure is 30 MPa, injection amount is 10 mm 3 / st), the common rail pressure decreases only by the injection amount from each injector 5, so the specified pressure Since a large number of injections are required to lower the temperature, it takes a long time to end up, and there is a problem that the engine transient characteristic during this time is extremely deteriorated.
【０００８】なお、コモンレールを採用した公知技術、
特開平２−１１２６４３号の燃料噴射装置は、コモンレ
ールを並列的に分割し、この分割したコモンレールにそ
れぞれ燃料噴射弁（インジェクター）を接続しておい
て、いずれかの燃料噴射弁が故障したときに、この故障
した燃料噴射弁へのコモンレールを閉鎖し、他方のコモ
ンレールのみへの燃料供給を続行することにより、内燃
機関の運転続行を保証しようとするものであるが、コモ
ンレール内の圧力自体の高低制御には直接関係がない。A publicly known technique using a common rail,
In the fuel injection device of Japanese Patent Laid-Open No. 2-112643, a common rail is divided in parallel, and fuel injection valves (injectors) are connected to the divided common rails, respectively, and when any of the fuel injection valves fails. By closing the common rail to the failed fuel injection valve and continuing the fuel supply to only the other common rail, the operation of the internal combustion engine is guaranteed to continue, but the pressure itself inside the common rail is high or low. It has no direct relation to control.
【０００９】また、特開平４−２３４５６２号の蓄圧式
燃料噴射装置は、コモンレールに減圧弁を設け、高圧ポ
ンプあるいはインジェクターが制御不能などの異常故障
時にこの減圧弁を開放することにより圧力を逃がしコモ
ンレール内を低圧にしようとするものであるが、単純に
圧力を低下させるだけであるので、エネルギー的に無駄
が多い。Further, in the pressure accumulating fuel injection device of Japanese Patent Laid-Open No. 4-234562, a pressure reducing valve is provided on a common rail, and the pressure is released by opening the pressure reducing valve when the high pressure pump or the injector has an abnormal failure such as uncontrollable. Although the inside pressure is to be reduced, the pressure is simply reduced, so much energy is wasted.
【００１０】特開平５−３２１７８７号の燃料噴射装置
は、始動用補助ポンプあるいはアシストポンプなどの圧
力制御システムを設けることにより、機関の始動時ある
いは停止時などにおいて燃料圧力を急速上昇あるいは急
速低下させようとするものであるが、始動用補助ポンプ
あるいはアシストポンプなどを設ける必要があり、コス
ト高になるとともに、構造の複雑化する。The fuel injection device of Japanese Patent Laid-Open No. 5-321787 is provided with a pressure control system such as an auxiliary pump for starting or an assist pump to rapidly increase or decrease the fuel pressure at the time of starting or stopping the engine. However, it is necessary to provide a starting auxiliary pump or an assist pump, which increases the cost and complicates the structure.
【００１１】特開平５−１４９２０９号の燃料噴射装置
は、サプライポンプ（燃料供給ポンプ）とコモンレール
との間にダンピングチャンバーを設けることにより、サ
プライポンプからの脈動を低減しようとするものである
が、コモンレール内の圧力自体の高低制御には直接関係
がない。The fuel injection device of Japanese Patent Laid-Open No. 149209/1993 attempts to reduce the pulsation from the supply pump by providing a damping chamber between the supply pump (fuel supply pump) and the common rail. It is not directly related to the control of the pressure in the common rail itself.
【００１２】特開平６−５８２１９号の共同レールは、
コモンレール自体を中央の室および側方の室などと少な
くとも二重構造にすることにより、中央の室内の圧力変
動を減少させようとするものであるが、コモンレール内
の圧力自体の高低制御には直接関係がない。The joint rail of JP-A-6-58219 is
Attempts are made to reduce the pressure fluctuations in the center room by making the common rail itself at least double-layered with the center room and side rooms. It doesn't matter.
【００１３】特開平６−９３９３６号の蓄圧式燃料噴射
装置は、高圧の第１蓄圧器および低圧の第２蓄圧器を設
け、高圧の第１蓄圧器をメイン噴射用とし、低圧の第２
蓄圧器をパイロット噴射用としているが、コモンレール
内の圧力自体の高低制御には直接関係がない。The pressure-accumulation fuel injection device of Japanese Patent Laid-Open No. 6-93936 is provided with a high-pressure first pressure accumulator and a low-pressure second pressure accumulator, the high-pressure first pressure accumulator is used for main injection, and the low-pressure second pressure accumulator is used.
Although the pressure accumulator is used for pilot injection, it is not directly related to the level control of the pressure in the common rail itself.
【００１４】[0014]
【発明が解決しようとする課題】本発明は以上のような
諸問題にかんがみなされたもので、とくに電子制御式燃
料噴射装置においてコモンレール圧を急速に低下させ
る、あるいは低圧から高圧にするなど、コモンレール内
の圧力の制御の迅速性を可能とする蓄圧式燃料噴射装置
を提供することを課題とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in particular, in an electronically controlled fuel injection device, the common rail pressure is rapidly decreased or is changed from low pressure to high pressure. An object of the present invention is to provide a pressure accumulating fuel injection device that enables quick control of internal pressure.
【００１５】また、本発明は、コモンレール圧の高低に
ともなう燃料供給ポンプへの負荷ないし損失をできるだ
け回避した蓄圧式燃料噴射装置を提供することを課題と
する。Another object of the present invention is to provide a pressure-accumulation type fuel injection device in which the load or loss on the fuel supply pump due to the rise and fall of the common rail pressure is avoided as much as possible.
【００１６】また、本発明は、コモンレール内の圧力を
制御するにあたって、構造が単純かつコスト的にも有利
な蓄圧式燃料噴射装置を提供することを課題とする。Another object of the present invention is to provide a pressure-accumulation fuel injection device which is simple in structure and advantageous in cost in controlling the pressure in the common rail.
【００１７】[0017]
【課題を解決するための手段】すなわち本発明は、コモ
ンレール圧を保持する機能と制御する機能とを分離する
こと、つまりコモンレールを圧力保持用と圧力制御用と
に分割すること、およびとくに圧力保持用コモンレール
をより大型に、圧力制御用コモンレールをより小型にす
ることに着目したもので、燃料供給ポンプと、この燃料
供給ポンプからの燃料を高圧状態で収容するコモンレー
ルと、このコモンレールに接続したインジェクターと、
を有する蓄圧式燃料噴射装置であって、上記コモンレー
ルは、これを少なくとも圧力保持用コモンレールと圧力
制御用コモンレールとに分割するとともに、この圧力保
持用コモンレールおよび圧力制御用コモンレールの間に
ソレノイドバルブなどの連通状態切換え手段を設け、か
つこの圧力制御用コモンレールに上記インジェクターを
接続したことを特徴とする蓄圧式燃料噴射装置である。That is, the present invention is to separate the function of holding the common rail pressure and the function of controlling the common rail pressure, that is, to divide the common rail for pressure holding and pressure control, and particularly for pressure holding. Focusing on making the common rail for operation larger and the common rail for pressure control smaller, the fuel supply pump, the common rail for accommodating fuel from this fuel supply pump in a high pressure state, and the injector connected to this common rail. When,
In the pressure-accumulation fuel injection device, the common rail is divided into at least a pressure-holding common rail and a pressure-controlling common rail, and a solenoid valve such as a solenoid valve is provided between the pressure-holding common rail and the pressure-controlling common rail. A pressure-accumulation type fuel injection device characterized in that a communication state switching means is provided and the injector is connected to the common rail for pressure control.
【００１８】上記圧力保持用コモンレールの容量をより
大とするとともに、上記圧力制御用コモンレールの容量
をより小とすることができる。The capacity of the pressure maintaining common rail can be made larger and the capacity of the pressure controlling common rail can be made smaller.
【００１９】上記圧力制御用コモンレールに減圧弁を設
けることができる。A pressure reducing valve may be provided on the common rail for pressure control.
【００２０】なお、上記圧力制御用コモンレールに圧力
センサーを設けることにより、この圧力制御用コモンレ
ール内の圧力を制御可能とすることができる。By providing a pressure sensor on the pressure control common rail, the pressure in the pressure control common rail can be controlled.
【００２１】[0021]
【作用】本発明による蓄圧式燃料噴射装置においては、
コモンレールを少なくとも大小ふたつに分割することに
より、機能的に圧力保持用および圧力制御用というふた
つのコモンレールを有することが可能となり、高圧から
低圧に、また低圧から高圧に変化制御することが容易と
なる。In the pressure-accumulation type fuel injection device according to the present invention,
By dividing the common rail into at least two large and small, it becomes possible to have two common rails for pressure retention and pressure control, and it becomes easy to control the change from high pressure to low pressure and from low pressure to high pressure. .
【００２２】すなわち、前記式（１）におけるコモンレ
ールのデッドボリュームＶｃを、圧力保持用コモンレー
ルおよび圧力制御用コモンレールの合計容積から圧力制
御用コモンレールの容積と小さくすることにより、コモ
ンレール圧の変化量△Ｐｃを大きくすることができる。That is, by changing the dead volume Vc of the common rail in the above equation (1) from the total volume of the pressure maintaining common rail and the pressure controlling common rail to the volume of the pressure controlling common rail, the variation ΔPc of the common rail pressure is obtained. Can be increased.
【００２３】したがって、たとえば上記ソレノイドバル
ブなどの連通状態切換え手段を閉鎖することにより圧力
保持用コモンレールと圧力制御用コモンレールとを遮断
すれば、圧力保持用コモンレール内の圧力は保持された
ままで、インジェクターにおける燃料噴射により圧力制
御用コモンレール内の圧力が低下するので、コモンレー
ル内の圧力を急速に低下させることができる。Therefore, if the common rail for pressure holding and the common rail for pressure control are shut off by closing the communication state switching means such as the solenoid valve, for example, the pressure in the common rail for pressure holding is maintained, and the pressure in the common rail for pressure holding is maintained. Since the pressure in the pressure control common rail is reduced by the fuel injection, the pressure in the common rail can be rapidly reduced.
【００２４】また、低圧から高圧に上昇させる場合に
は、上記連通状態切換え手段を開放することにより圧力
保持用コモンレールと圧力制御用コモンレールとを連通
すれば、圧力保持用コモンレール内の圧力は保持された
ままであるので、燃料供給ポンプの駆動により圧力制御
用コモンレール内の圧力も直ちに上昇可能であって、い
ずれの場合もエンジンの要請に的確に応えることができ
る。Further, when the pressure is raised from a low pressure to a high pressure, the pressure in the pressure maintaining common rail is maintained by opening the communication state switching means so that the pressure maintaining common rail communicates with the pressure controlling common rail. Since the fuel supply pump is driven as it is, the pressure in the common rail for pressure control can be immediately increased by driving the fuel supply pump, and in any case, the demand of the engine can be appropriately met.
【００２５】[0025]
【実施例】つぎに本発明の一実施例による蓄圧式燃料噴
射装置１０を図１にもとづき説明する。ただし、図２お
よび図３と同様の部分には同一符号を付し、その詳述は
これを省略する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An accumulator fuel injection system 10 according to an embodiment of the present invention will be described with reference to FIG. However, the same parts as those in FIGS. 2 and 3 are designated by the same reference numerals, and the detailed description thereof will be omitted.
【００２６】図１は、蓄圧式燃料噴射装置１０の概略説
明図であって、この蓄圧式燃料噴射装置１０は、従来の
電子制御式燃料噴射装置１のコモンレール３に代えて圧
力保持用コモンレール１１と、圧力制御用コモンレール
１２とを有しているとともに、圧力保持用コモンレール
１１と圧力制御用コモンレール１２との間を連通する接
続パイプ１３を設け、この接続パイプ１３に連通状態切
換え手段としてソレノイドバルブ１４を取り付けてあ
る。図示のように圧力保持用コモンレール１１と、圧力
制御用コモンレール１２と、インジェクター５とを直列
的に配列した構成としてある。FIG. 1 is a schematic explanatory view of a pressure-accumulation type fuel injection device 10. This pressure-accumulation type fuel injection device 10 is replaced with a common rail 3 of a conventional electronically controlled fuel injection device 1 and a pressure holding common rail 11 is provided. And a common rail 12 for pressure control, and a connection pipe 13 for communicating between the common rail 11 for pressure retention and the common rail 12 for pressure control is provided. The connection pipe 13 is a solenoid valve as a communication state switching means. 14 is attached. As shown in the figure, the pressure maintaining common rail 11, the pressure controlling common rail 12 and the injector 5 are arranged in series.
【００２７】なお、圧力保持用コモンレール１１と圧力
制御用コモンレール１２とのデッドボリュームの総和
は、これをコモンレール３のデッドボリュームと同じと
することができる。The total dead volume of the pressure holding common rail 11 and the pressure control common rail 12 can be the same as the dead volume of the common rail 3.
【００２８】前記圧力センサー６は、これを圧力制御用
コモンレール１２に取り付けてある。The pressure sensor 6 is attached to a common rail 12 for pressure control.
【００２９】こうした構成の蓄圧式燃料噴射装置１０に
おいて、ソレノイドバルブ１４を閉弁して圧力制御用コ
モンレール１２を圧力保持用コモンレール１１から分離
させることにより、コモンレール３としてのデッドボリ
ュームを瞬間的に小さくすることができ、図３の点線で
示すように、インジェクター５の部分における燃料噴射
にともない燃料噴射圧力を速やかに降下させることがで
きる。In the pressure-accumulation type fuel injection device 10 having such a configuration, the solenoid valve 14 is closed to separate the common rail 12 for pressure control from the common rail 11 for pressure retention, so that the dead volume as the common rail 3 is instantaneously reduced. Therefore, as shown by the dotted line in FIG. 3, the fuel injection pressure in the injector 5 portion can be promptly lowered with the fuel injection.
【００３０】なお、圧力センサー６により圧力制御用コ
モンレール１２内の圧力を検出し、適宜ソレノイドバル
ブ１４を開閉することにより所定の圧力に維持すること
ができる。The pressure in the common rail 12 for pressure control is detected by the pressure sensor 6, and the solenoid valve 14 is appropriately opened and closed to maintain the predetermined pressure.
【００３１】さらに、インジェクター５への圧力を低圧
から高圧に上昇させるに際しても、ソレノイドバルブ１
４を開弁すれば、ただちに圧力保持用コモンレール１１
の圧力を圧力制御用コモンレール１２側に移行すること
ができるため、燃料供給ポンプ２の駆動にともなう圧力
上昇の時間を短縮することができる。Furthermore, when increasing the pressure to the injector 5 from low pressure to high pressure, the solenoid valve 1
When valve 4 is opened, the pressure-holding common rail 11 immediately
Since it is possible to shift the pressure to the pressure control common rail 12 side, it is possible to shorten the time required for the pressure to rise as the fuel supply pump 2 is driven.
【００３２】しかも、圧力制御用コモンレール１２内の
圧力を急速に低下させるとともに、高圧自体は圧力保持
用コモンレール１１内に保持されているので、圧力損失
は従来に比較して少ない。なお従来の高圧を開放する方
式では、燃料供給ポンプ２の駆動動力を大きくする必要
があるとともに、損失が大である。Moreover, since the pressure in the pressure control common rail 12 is rapidly lowered and the high pressure itself is held in the pressure holding common rail 11, the pressure loss is smaller than in the conventional case. In the conventional method of releasing the high pressure, it is necessary to increase the driving power of the fuel supply pump 2, and the loss is large.
【００３３】また、圧力保持用コモンレール１１と圧力
制御用コモンレール１２との分割したので、燃料供給ポ
ンプ２側からの圧力変動に対するダンピング効果もあ
る。Since the pressure-holding common rail 11 and the pressure-controlling common rail 12 are divided, there is also a damping effect for pressure fluctuations from the fuel supply pump 2 side.
【００３４】なお、圧力制御用コモンレール１２に減圧
弁２５（図１中仮想線）を設けることにより、上述のよ
うなソレノイドバルブ１４の閉鎖およびインジェクター
５における燃料噴射による圧力制御用コモンレール１２
の圧力低下作用をさらに促進することができる。By providing the pressure reducing valve 25 (phantom line in FIG. 1) on the common rail 12 for pressure control, the common rail 12 for pressure control by closing the solenoid valve 14 and injecting fuel in the injector 5 as described above.
It is possible to further accelerate the pressure lowering effect of.
【００３５】本発明においては、圧力保持用コモンレー
ル１１と圧力制御用コモンレール１２とのデッドボリュ
ームの比は、燃料供給ポンプ２の吐出能力やインジェク
ター５の噴射量などに応じて任意にこれを決定すること
ができるが、圧力保持用コモンレール１１を圧力制御用
コモンレール１２より大型とすることにより圧力制御用
コモンレール内の圧力の上昇下降をさらに迅速に行うこ
とができる。In the present invention, the dead volume ratio between the pressure-holding common rail 11 and the pressure-controlling common rail 12 is arbitrarily determined according to the discharge capacity of the fuel supply pump 2 and the injection amount of the injector 5. However, by making the pressure-holding common rail 11 larger than the pressure-controlling common rail 12, the pressure inside the pressure-controlling common rail can be raised and lowered more quickly.
【００３６】[0036]
【発明の効果】以上のように本発明によれば、コモンレ
ールを圧力保持用コモンレールと圧力制御用コモンレー
ルとに分割したので、コモンレール内の圧力の制御およ
び保持という、従来から相反する機能を合わせ持つこと
が可能となり、とくにコモンレール内の圧力を急速に低
下させることが可能となった。As described above, according to the present invention, since the common rail is divided into the pressure-holding common rail and the pressure-controlling common rail, it has a contradictory function of controlling and holding the pressure in the common rail. It became possible to reduce the pressure inside the common rail rapidly.
【００３７】[0037]
【図１】本発明の一実施例による蓄圧式燃料噴射装置１
０の概略説明図である。FIG. 1 is a pressure accumulation type fuel injection device 1 according to an embodiment of the present invention.
It is a schematic explanatory drawing of 0.
【図２】従来の電子制御式燃料噴射装置１の概略説明図
である。FIG. 2 is a schematic explanatory view of a conventional electronically controlled fuel injection device 1.
【図３】コモンレール圧の時間に対する変化のグラフで
ある。FIG. 3 is a graph of changes in common rail pressure over time.
１ 電子制御式燃料噴射装置 ２ 燃料供給ポンプ ３ コモンレール（高圧蓄圧器） ４ 燃料噴射管 ５ インジェクター ６ 圧力センサー ７ 制御手段 ８ 各種の条件信号 ９ インジェクター５の噴口 １０ 蓄圧式燃料噴射装置 １１ 圧力保持用コモンレール １２ 圧力制御用コモンレール １３ 接続パイプ １４ ソレノイドバルブ（連通状態切換え手段） １５ 減圧弁 DESCRIPTION OF SYMBOLS 1 Electronically controlled fuel injection device 2 Fuel supply pump 3 Common rail (high pressure accumulator) 4 Fuel injection pipe 5 Injector 6 Pressure sensor 7 Control means 8 Various condition signals 9 Injector 5 injector 10 Accumulation type fuel injection device 11 For pressure retention Common rail 12 Common rail for pressure control 13 Connection pipe 14 Solenoid valve (communication state switching means) 15 Pressure reducing valve
Claims (3)
モンレールと、 このコモンレールに接続したインジェクターと、を有す
る蓄圧式燃料噴射装置であって、 前記コモンレールは、これを少なくとも圧力保持用コモ
ンレールと圧力制御用コモンレールとに分割するととも
に、 この圧力保持用コモンレールおよび圧力制御用コモンレ
ールの間に連通状態切換え手段を設け、かつこの圧力制
御用コモンレールに前記インジェクターを接続したこと
を特徴とする蓄圧式燃料噴射装置。1. A pressure-accumulation fuel injection device, comprising: a fuel supply pump; a common rail for accommodating fuel from the fuel supply pump in a high pressure state; and an injector connected to the common rail. Is divided into at least a common rail for pressure holding and a common rail for pressure control, and a communication state switching means is provided between the common rail for pressure holding and the common rail for pressure control, and the injector is connected to the common rail for pressure control. Accumulation type fuel injection device characterized by.
より大とするとともに、前記圧力制御用コモンレールの
容量をより小としたことを特徴とする請求項１記載の蓄
圧式燃料噴射装置。2. The pressure-accumulation fuel injection device according to claim 1, wherein the capacity of the pressure holding common rail is made larger and the capacity of the pressure control common rail is made smaller.
を設けたことを特徴とする請求項１記載の蓄圧式燃料噴
射装置。3. The pressure-accumulation fuel injection device according to claim 1, wherein a pressure reducing valve is provided on the common rail for pressure control.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6226044A JPH0868368A (en) | 1994-08-29 | 1994-08-29 | Pressure accumulation type fuel injection device |
| EP95112465A EP0699835A1 (en) | 1994-08-29 | 1995-08-08 | Accumulated pressure type fuel injection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6226044A JPH0868368A (en) | 1994-08-29 | 1994-08-29 | Pressure accumulation type fuel injection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0868368A true JPH0868368A (en) | 1996-03-12 |
Family
ID=16838912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6226044A Pending JPH0868368A (en) | 1994-08-29 | 1994-08-29 | Pressure accumulation type fuel injection device |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0699835A1 (en) |
| JP (1) | JPH0868368A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007303314A (en) * | 2006-05-09 | 2007-11-22 | Yanmar Co Ltd | Common rail fuel injection device |
| JP2010014121A (en) * | 2009-08-31 | 2010-01-21 | Hitachi Ltd | Fuel pressure control device |
| WO2010084651A1 (en) * | 2009-01-26 | 2010-07-29 | 三菱重工業株式会社 | Device for controlling variation in pressure upstream of common rail |
| JP2011033038A (en) * | 2009-08-05 | 2011-02-17 | Robert Bosch Gmbh | High pressure accumulator reduced in volume |
| US8215287B2 (en) | 2008-12-03 | 2012-07-10 | Hyundai Motor Company | Fuel supply apparatus for engine and injector for the same |
| JP2016534282A (en) * | 2013-09-16 | 2016-11-04 | デルファイ・インターナショナル・オペレーションズ・ルクセンブルク・エス・アー・エール・エル | Hybrid fuel injector |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1281303B1 (en) * | 1995-03-28 | 1998-02-17 | Elasis Sistema Ricerca Fiat | DEVICE FOR REGULATING THE SUPPLY PRESSURE OF A FLUID IN A PRESSURE FLUID ACCUMULATOR, FOR EXAMPLE FOR |
| DE19727413A1 (en) | 1997-06-27 | 1999-01-07 | Bosch Gmbh Robert | Fuel injection system for internal combustion engines |
| EP1143140B1 (en) * | 2000-03-01 | 2004-04-14 | Wärtsilä Schweiz AG | Arrangement of common rail system |
| EP1130251A1 (en) * | 2000-03-01 | 2001-09-05 | Wärtsilä NSD Schweiz AG | Pump arrangement for a common rail injection system |
| KR100580699B1 (en) | 2003-10-27 | 2006-05-15 | 현대자동차주식회사 | Common rail system |
| US7334570B2 (en) | 2005-04-01 | 2008-02-26 | Achates Power, Inc. | Common rail fuel injection system with accumulator injectors |
| FR2955155B1 (en) * | 2010-01-13 | 2012-01-06 | Peugeot Citroen Automobiles Sa | INJECTION DEVICE FOR INTERNAL COMBUSTION ENGINE |
| DE102010042081A1 (en) * | 2010-10-06 | 2012-01-19 | Robert Bosch Gmbh | High-pressure injection system is provided with high-pressure accumulator with multiple injector connections and another high-pressure accumulator separated by valve |
| CN114673601B (en) * | 2022-03-18 | 2023-03-28 | 东风商用车有限公司 | Rapid pressure building method, device and equipment for starting diesel engine and readable storage medium |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5813152A (en) * | 1981-07-17 | 1983-01-25 | Diesel Kiki Co Ltd | Residual pressure control unit for fuel injection unit |
| JPH0816470B2 (en) * | 1986-10-03 | 1996-02-21 | トヨタ自動車株式会社 | Fuel injection device for internal combustion engine |
| JPH02112643A (en) | 1988-10-21 | 1990-04-25 | Nippon Denso Co Ltd | Fuel injection device |
| JPH04234562A (en) | 1991-01-08 | 1992-08-24 | Nippondenso Co Ltd | Accumulator fuel injection device |
| JP2596657B2 (en) | 1991-07-09 | 1997-04-02 | ティビー・エム・マーチン | Joint rail |
| JPH05149209A (en) | 1991-11-27 | 1993-06-15 | Nippondenso Co Ltd | Fuel injection device |
| JPH05321787A (en) | 1992-05-26 | 1993-12-07 | Nippon Soken Inc | Fuel injector |
| JP2882209B2 (en) | 1992-09-11 | 1999-04-12 | 三菱自動車工業株式会社 | Accumulator type fuel injection device |
-
1994
- 1994-08-29 JP JP6226044A patent/JPH0868368A/en active Pending
-
1995
- 1995-08-08 EP EP95112465A patent/EP0699835A1/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007303314A (en) * | 2006-05-09 | 2007-11-22 | Yanmar Co Ltd | Common rail fuel injection device |
| US8215287B2 (en) | 2008-12-03 | 2012-07-10 | Hyundai Motor Company | Fuel supply apparatus for engine and injector for the same |
| WO2010084651A1 (en) * | 2009-01-26 | 2010-07-29 | 三菱重工業株式会社 | Device for controlling variation in pressure upstream of common rail |
| US8813721B2 (en) | 2009-01-26 | 2014-08-26 | Mitsubishi Heavy Industries, Ltd. | Pressure fluctuation control device for controlling pressure fluctuation in upstream side of common rail |
| JP2011033038A (en) * | 2009-08-05 | 2011-02-17 | Robert Bosch Gmbh | High pressure accumulator reduced in volume |
| JP2010014121A (en) * | 2009-08-31 | 2010-01-21 | Hitachi Ltd | Fuel pressure control device |
| JP2016534282A (en) * | 2013-09-16 | 2016-11-04 | デルファイ・インターナショナル・オペレーションズ・ルクセンブルク・エス・アー・エール・エル | Hybrid fuel injector |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0699835A1 (en) | 1996-03-06 |
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