JPH0821333A - Fuel injection device - Google Patents
Fuel injection deviceInfo
- Publication number
- JPH0821333A JPH0821333A JP6154453A JP15445394A JPH0821333A JP H0821333 A JPH0821333 A JP H0821333A JP 6154453 A JP6154453 A JP 6154453A JP 15445394 A JP15445394 A JP 15445394A JP H0821333 A JPH0821333 A JP H0821333A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- resonator
- passage
- supply pipe
- orifice
- 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
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
-
- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
-
- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
-
- 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
- F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
- F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
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、内燃機関（以下「内燃
機関」をエンジンという）用の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 fuel injection device for an internal combustion engine (hereinafter "internal combustion engine" is called an engine).
【０００２】[0002]
【従来の技術】従来のメカニカルな燃料噴射ポンプおよ
び燃料噴射ノズルからなる燃料噴射システムに代わり、
近年、より制御性に優れた電子制御式燃料噴射装置とし
て、圧力調整機構により所定の圧力に調整可能なコモン
レールを設け、コモンレールに蓄圧された高圧燃料を噴
射弁によりエンジンシリンダ内へ噴射する蓄圧式の燃料
噴射装置が知られている。2. Description of the Related Art Instead of a conventional mechanical fuel injection pump and fuel injection system consisting of a fuel injection nozzle,
In recent years, as an electronically controlled fuel injection device with better controllability, a pressure-regulating mechanism is provided with a common rail that can be adjusted to a predetermined pressure, and a high-pressure fuel accumulated in the common rail is injected into an engine cylinder by an injection valve. Fuel injection devices are known.
【０００３】この種の燃料噴射装置は、図９に示すよう
に、高圧燃料供給ポンプ１０１により燃料供給管１０２
を通じてコモンレール１０３内に高圧燃料を圧送し、コ
モンレール１０３内に高圧燃料を蓄圧している。このコ
モンレール１０３から分岐供給管１０４によりエンジン
１０５の各気筒に高圧燃料を分配供給し、電磁弁１０６
を開弁することにより噴射弁１０７を経てエンジン１０
５の各気筒に高圧燃料を噴射している。そして、噴射弁
１０７が急速に閉弁することにより燃料噴射を終了させ
る。このとき、分岐供給管１０４内に高圧燃料の油撃が
発生し、この油撃が分岐供給管１０４内を伝播してコモ
ンレールに１０３に伝わり、圧力脈動の原因となる。In this type of fuel injection device, as shown in FIG. 9, a high pressure fuel supply pump 101 is used to supply a fuel supply pipe 102.
The high-pressure fuel is pumped into the common rail 103 through the, and the high-pressure fuel is accumulated in the common rail 103. High pressure fuel is distributed and supplied from the common rail 103 to each cylinder of the engine 105 through a branch supply pipe 104, and a solenoid valve 106 is provided.
The engine 10 through the injection valve 107 by opening
High-pressure fuel is injected into each cylinder of No. 5. Then, the injection valve 107 is rapidly closed to terminate the fuel injection. At this time, an oil hammer of the high-pressure fuel occurs in the branch supply pipe 104, and this oil hammer propagates in the branch supply pipe 104 and is transmitted to the common rail 103, which causes pressure pulsation.
【０００４】すなわち、噴射弁１０７から分岐供給管１
０４を伝播した圧力波の一部はコモンレール１０３との
接続部に達すると、断面積拡大作用により位相反転して
膨張波となり再び分岐供給管１０４を噴射弁１０７に向
けて反射する。他の圧力波はそのままコモンレール１０
３内に伝播する。コモンレール１０３から噴射弁１０７
に反射した圧力波は、噴射弁１０７の着座部で再び反射
され分岐供給管１０４を伝播しコモンレール１０３に向
かう。このように、圧力波が分岐供給管１０４内を往復
することにより圧力脈動波が発生する。この圧力脈動波
がコモンレール１０３に伝播すると、他の気筒の噴射弁
１０７が燃料を噴射しているときにその噴射圧力を変動
させ、この圧力干渉により所定の噴射量や噴射率が変化
するという問題がある。また、コモンレール１０４から
噴射弁１０７に向けて同じ分岐供給管１０４内を反射す
る圧力波により噴射弁１０７の次回の開弁タイミングに
変動が生じ精度の高い燃料噴射制御が困難になるという
問題がある。That is, from the injection valve 107 to the branch supply pipe 1
When a part of the pressure wave propagating through 04 reaches the connecting portion with the common rail 103, the phase is inverted due to the cross-sectional area expanding action to become an expansion wave, which is reflected again from the branch supply pipe 104 toward the injection valve 107. Other pressure waves are common rail 10
Propagate within 3. From common rail 103 to injection valve 107
The pressure wave reflected by is reflected again at the seating portion of the injection valve 107, propagates through the branch supply pipe 104, and travels toward the common rail 103. In this way, the pressure pulsating wave is generated by the pressure wave reciprocating in the branch supply pipe 104. When this pressure pulsation wave propagates to the common rail 103, the injection pressure is changed while the injection valve 107 of another cylinder is injecting fuel, and this pressure interference changes the predetermined injection amount and injection rate. There is. In addition, there is a problem that pressure waves reflected in the same branch supply pipe 104 from the common rail 104 toward the injection valve 107 cause variations in the next valve opening timing of the injection valve 107, making it difficult to perform highly accurate fuel injection control. .
【０００５】また、高圧燃料供給ポンプ１０１から燃料
供給管１０２を介しコモンレール１０３に供給される燃
料の一部は、燃料供給管１０２とコモンレール１０３と
の接続部で断面積拡大作用により位相反転して膨張波と
なり再び燃料供給管１０２を高圧燃料供給ポンプ１０１
に向けて反射する。コモンレール１０３から高圧燃料供
給ポンプ１０１に向け反射した圧力波は、逆流防止用の
チェック弁１０８で再び反射され燃料供給管１０２を伝
播しコモンレール１０３に向かう。このようにして圧力
波が燃料供給管１０２内を往復しコモンレール１０３に
伝播すると、前述したように、圧力波の一部がそのまま
コモンレール１０３内に伝播し、噴射弁１０７が燃料を
噴射しているときにその噴射圧力を変動させ、この圧力
干渉により所定の噴射量や噴射率が変化するという問題
がある。Further, a part of the fuel supplied from the high-pressure fuel supply pump 101 to the common rail 103 via the fuel supply pipe 102 is phase-inverted at the connecting portion between the fuel supply pipe 102 and the common rail 103 by the cross-sectional area expanding action. It becomes an expansion wave, and the high pressure fuel supply pump 101 is connected to the fuel supply pipe 102 again.
Reflect toward. The pressure wave reflected from the common rail 103 toward the high-pressure fuel supply pump 101 is reflected again by the check valve 108 for preventing backflow and propagates through the fuel supply pipe 102 toward the common rail 103. In this way, when the pressure wave reciprocates in the fuel supply pipe 102 and propagates to the common rail 103, as described above, a part of the pressure wave directly propagates into the common rail 103 and the injection valve 107 injects fuel. Sometimes, the injection pressure is changed, and there is a problem that the predetermined injection amount and injection rate change due to this pressure interference.
【０００６】このような問題を解決するため、コモンレ
ールから噴射弁に燃料を供給する分岐供給管に端部の閉
じた減衰枝管を接続することが考えられる。このもの
は、分岐供給管内を発生する圧力波により減衰技管内に
位相のずれた別の圧力波が発生し、この減衰枝管内の位
相のずれた圧力波が分岐供給管内の圧力波と干渉し分岐
供給管内の圧力脈動波を減衰する。In order to solve such a problem, it is conceivable to connect a damping branch pipe whose end is closed to a branch supply pipe for supplying fuel from a common rail to an injection valve. This is because the pressure wave generated in the branch supply pipe generates another pressure wave in the damping pipe, which is out of phase, and the pressure wave in the attenuation branch pipe interferes with the pressure wave in the branch supply pipe. The pressure pulsation wave in the branch supply pipe is attenuated.
【０００７】[0007]
【発明が解決しようとする課題】ところが、このように
減衰枝管に発生する位相のずれた圧力波により圧力脈動
波を減衰させるものは、減衰枝管の長さにより位相差が
規定されるので、エンジンルーム内のスペースに制約が
ある場合など所望の長さに減衰枝管を形成できないとう
問題がある。However, in the case of attenuating the pressure pulsation wave by the phase-shifted pressure waves generated in the damping branch pipe, the phase difference is defined by the length of the damping branch pipe. However, there is a problem that the damping branch pipe cannot be formed in a desired length when the space in the engine room is limited.
【０００８】本発明はこのような問題を解決するために
なされたもので、圧力脈動波を簡単な構成で容易に減衰
可能であり、燃料噴射量および燃料噴射率の制御精度の
高い燃料噴射装置を提供することを目的とする。The present invention has been made in order to solve such a problem, and a pressure pulsation wave can be easily attenuated with a simple structure, and a fuel injection device having a high control accuracy of the fuel injection amount and the fuel injection rate. The purpose is to provide.
【０００９】[0009]
【課題を解決するための手段】前記目的を達成するため
の本発明の請求項１記載の燃料噴射装置は、燃料供給ポ
ンプと、前記燃料供給ポンプから供給される燃料を蓄圧
するコモンレールと、前記燃料供給ポンプと前記コモン
レールとを接続し、前記燃料供給ポンプから前記コモン
レールに燃料を供給可能な第１の燃料通路を有する燃料
供給管と、内燃機関の各気筒毎に設けられる噴射弁と、
前記コモンレールと前記噴射弁とを接続し、前記コモン
レールで蓄圧された高圧燃料を前記噴射弁に供給可能な
第２の燃料通路を有する分岐供給管と、頸部通路と共鳴
室とを有する共鳴器であって、前記燃料供給管および前
記分岐供給管の少なくともいずれか一方に設けられ、前
記第１の燃料通路または前記第２の燃料通路と前記頸部
通路を介して前記共鳴室が連通する共鳴器と、を備える
ことを特徴とする．本発明の請求項２記載の燃料噴射装
置は、請求項１記載の燃料噴射装置において、頸部通路
と共鳴室とを有する共鳴器であって、前記燃料供給管お
よび前記分岐供給管の少なくともいずれか一方に設けら
れ、前記第１の燃料通路または前記第２の燃料通路と前
記頸部通路を介して前記共鳴室が連通する共鳴器に代え
て、燃料下流側に形成される第１のオリフィス、燃料上
流側に形成される第２のオリフィス、および、前記第１
のオリフィスと前記第２のオリフィスとの間に形成され
る共鳴室を有する共鳴器であって、前記燃料供給管およ
び前記分岐供給管の少なくともいずれか一方に設けら
れ、前記第１のオリフィスと前記第２のオリフィスと前
記共鳴室とは前記第１の燃料通路または前記第２の燃料
通路の一部を形成し前記第１のオリフィスおよび前記第
２のオリフィスのいずれか一方は他方よりも径が小さい
共鳴器を備えることを特徴とする。A fuel injection device according to claim 1 of the present invention for achieving the above object, a fuel supply pump, a common rail for accumulating fuel supplied from the fuel supply pump, and A fuel supply pipe having a first fuel passage connecting the fuel supply pump and the common rail and capable of supplying fuel from the fuel supply pump to the common rail; and an injection valve provided for each cylinder of the internal combustion engine,
A resonator having a branch supply pipe connecting the common rail and the injection valve, having a second fuel passage capable of supplying high-pressure fuel accumulated in the common rail to the injection valve, a neck passage, and a resonance chamber. A resonance provided in at least one of the fuel supply pipe and the branch supply pipe, the resonance chamber communicating with the first fuel passage or the second fuel passage and the neck passage. And a container. A fuel injection device according to claim 2 of the present invention is the fuel injection device according to claim 1, which is a resonator having a neck passage and a resonance chamber, wherein at least one of the fuel supply pipe and the branch supply pipe is provided. A first orifice provided on one side of the first fuel passage or the second fuel passage and formed in the fuel downstream side, instead of the resonator communicating with the resonance chamber via the neck passage. A second orifice formed on the fuel upstream side, and the first orifice
A resonance chamber formed between the first orifice and the second orifice, the resonance chamber being formed between the first orifice and the second supply orifice, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe. The second orifice and the resonance chamber form a part of the first fuel passage or the second fuel passage, and one of the first orifice and the second orifice has a diameter larger than that of the other. It is characterized by having a small resonator.
【００１０】本発明の請求項３記載の燃料噴射装置は、
請求項１記載の燃料噴射装置において、頸部通路と共鳴
室とを有する共鳴器であって、前記燃料供給管および前
記分岐供給管の少なくともいずれか一方に設けられ、前
記第１の燃料通路または前記第２の燃料通路と前記頸部
通路を介して前記共鳴室が連通する共鳴器に代えて、燃
料上流側に設けられ燃料上流側を閉弁方向とするチェッ
ク弁とこのチェック弁を燃料上流側に付勢する付勢手段
とを備え、燃料下流側にオリフィスを有するとともに前
記オリフィスと前記チェック弁との間に形成される共鳴
室を有する共鳴器であって、前記燃料供給管および前記
分岐供給管の少なくともいずれか一方に設けられ、前記
オリフィスと前記共鳴室とは前記第１の燃料通路または
前記第２の燃料通路の一部を形成する共鳴器を備えるこ
とを特徴とする。The fuel injection device according to claim 3 of the present invention is
The fuel injection device according to claim 1, wherein the resonator has a neck passage and a resonance chamber, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe, and the first fuel passage or In place of the resonator in which the resonance chamber communicates with the second fuel passage and the neck passage, a check valve provided on the fuel upstream side and closing the fuel upstream side is a check valve, and the check valve is the fuel upstream side. A resonator having an orifice on the downstream side of the fuel and a resonance chamber formed between the orifice and the check valve, the fuel supply pipe and the branch being provided. It is characterized in that a resonator is provided in at least one of the supply pipes, and the orifice and the resonance chamber include a resonator forming a part of the first fuel passage or the second fuel passage.
【００１１】本発明の請求項４記載の燃料噴射装置は、
請求項１記載の燃料噴射装置において、頸部通路と共鳴
室とを有する共鳴器であって、前記燃料供給管および前
記分岐供給管の少なくともいずれか一方に設けられ、前
記第１の燃料通路または前記第２の燃料通路と前記頸部
通路を介して前記共鳴室が連通する共鳴器に代えて、軸
方向に貫通するオリフィスを有し燃料下流側に設けられ
るオリフィス弁と前記オリフィス弁を付勢する第１の付
勢手段と前記オリフィス弁が当接可能な弁座と燃料上流
側に設けられるチェック弁とこのチェック弁を燃料上流
側に付勢する第２の付勢手段とを備え、前記オリフィス
弁と前記チェック弁との間に形成される共鳴室を有する
共鳴器であって、前記燃料供給管および前記分岐供給管
の少なくともいずれか一方に設けられ、前記オリフィス
と前記共鳴室とは前記第１の燃料通路または前記第２の
燃料通路の一部を形成する共鳴器を備えることを特徴と
する。A fuel injection device according to a fourth aspect of the present invention is
The fuel injection device according to claim 1, wherein the resonator has a neck passage and a resonance chamber, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe, and the first fuel passage or In place of the resonator in which the resonance chamber communicates with the second fuel passage and the neck passage, an orifice valve penetrating in the axial direction and having an orifice penetrating in the axial direction and the orifice valve are energized. And a second seat for contacting the orifice valve, a check valve provided on the fuel upstream side, and a second urging means for urging the check valve toward the fuel upstream side. A resonator having a resonance chamber formed between an orifice valve and the check valve, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe, and the orifice and the resonance chamber. Characterized in that it comprises a resonator which forms part of the serial first fuel passage or the second fuel passage.
【００１２】本発明の請求項５記載の燃料噴射装置は、
前記第１の燃料通路または前記第２の燃料通路に発生す
る圧力脈動波の周波数をｆ、前記共鳴器の共鳴周波数を
ｆrとすると、（１／１．３）ｆ≦ｆr ≦１．７５ｆで
あることが望ましい。The fuel injection device according to claim 5 of the present invention is
When the frequency of the pressure pulsation wave generated in the first fuel passage or the second fuel passage f, and the resonant frequency of the resonator and f r, (1 / 1.3) f ≦ f r ≦ 1. It is preferably 75f.
【００１３】[0013]
【作用および発明の効果】本発明の請求項１記載の燃料
噴射装置によると、燃料供給管および分岐供給管の少な
くともいずれか一方に共鳴器を設けることにより噴射弁
に伝播する圧力脈動波を減衰させることができるので、
所定の燃料噴射量および燃料噴射率を良好に保持するこ
とができる。According to the fuel injection device of the first aspect of the present invention, a pressure pulsation wave propagating to the injection valve is attenuated by providing a resonator in at least one of the fuel supply pipe and the branch supply pipe. Because you can
The predetermined fuel injection amount and fuel injection rate can be maintained satisfactorily.
【００１４】また本発明の請求項２記載の燃料噴射装置
によると、燃料供給管および分岐供給管の少なくともい
ずれか一方に共鳴器を設け、第１のオリフィスと第２の
オリフィスと共鳴室とから第１の燃料通路または第２の
燃料通路の一部を形成することにより、エンジンルーム
内のスペースに共鳴器を設置しやすいという効果があ
る。According to a second aspect of the fuel injection device of the present invention, a resonator is provided in at least one of the fuel supply pipe and the branch supply pipe, and the first orifice, the second orifice, and the resonance chamber are provided. By forming a part of the first fuel passage or the second fuel passage, it is possible to easily install the resonator in the space in the engine room.
【００１５】さらに本発明の請求項３記載の燃料噴射装
置によると、燃料上流側にチェック弁を設けたことによ
り共鳴器に形成されるオリフィスは燃料下流側の１つだ
けになるので、燃料供給時の圧力損失を低減できる。さ
らにまた本発明の請求項４記載の燃料噴射装置による
と、軸方向に貫通するオリフィスを有するオリフィス弁
を燃料下流側に設け、燃料供給時にこのオリフィス弁が
リフトすることにより、燃料供給時の圧力損失をさらに
低減することができる。Further, according to the third aspect of the present invention, since the check valve is provided on the fuel upstream side, only one orifice is formed on the resonator on the fuel downstream side. The pressure loss at the time can be reduced. Further, according to the fuel injection device of claim 4 of the present invention, an orifice valve having an orifice penetrating in the axial direction is provided on the fuel downstream side, and the orifice valve lifts at the time of fuel supply, so that the pressure at the time of fuel supply is increased. The loss can be further reduced.
【００１６】さらにまた本発明の請求項５記載の燃料噴
射装置によると、第１の燃料通路または第２の燃料通路
に発生する圧力脈動波の周波数をｆ、前記共鳴器の共鳴
周波数をｆr とし、（１／１．３）ｆ≦ｆr ≦１．７５
ｆを満たすように共鳴器を形成することにより、圧力脈
動波を良好に減衰することができる。According to a fifth aspect of the fuel injection device of the present invention, the frequency of the pressure pulsation wave generated in the first fuel passage or the second fuel passage is f, and the resonance frequency of the resonator is f r. And (1 / 1.3) f ≤ fr ≤ 1.75
By forming the resonator so as to satisfy f, the pressure pulsation wave can be favorably damped.
【００１７】[0017]
【実施例】本発明の実施例を図面に基づいて説明する。 （第１実施例）本発明の第１実施例による燃料噴射装置
を図１に示す。高圧燃料供給ポンプ１の燃料吐出側にチ
ェック弁２が配置され、このチェック弁２から燃料供給
管３を介し高圧燃料供給ポンプ１はコモンレール４に接
続している。コモンレール４には、コモンレール４内の
燃料圧力を検知する圧力センサ１９が設置されている。
エンジン５には、各気筒の燃焼室にそれぞれ噴射弁６が
配置されている。噴射弁６による各気筒への燃料噴射
は、噴射制御用の電磁弁７の開閉により制御される。各
噴射弁６は分岐供給管８を介し各気筒に共通なコモンレ
ール４に接続されている。共鳴器２０はチェック弁２の
燃料下流側の燃料供給管３に取付けられ、共鳴器２１
は、噴射弁６の燃料上流側の分岐供給管８に取付けられ
ている。An embodiment of the present invention will be described with reference to the drawings. (First Embodiment) FIG. 1 shows a fuel injection device according to a first embodiment of the present invention. A check valve 2 is arranged on the fuel discharge side of the high-pressure fuel supply pump 1, and the high-pressure fuel supply pump 1 is connected to a common rail 4 from the check valve 2 via a fuel supply pipe 3. A pressure sensor 19 that detects the fuel pressure in the common rail 4 is installed on the common rail 4.
In the engine 5, an injection valve 6 is arranged in each combustion chamber of each cylinder. The fuel injection into each cylinder by the injection valve 6 is controlled by opening and closing the electromagnetic valve 7 for injection control. Each injection valve 6 is connected to a common rail 4 common to each cylinder via a branch supply pipe 8. The resonator 20 is attached to the fuel supply pipe 3 on the fuel downstream side of the check valve 2, and
Is attached to the branch supply pipe 8 on the fuel upstream side of the injection valve 6.
【００１８】電子制御ユニット（ＥＣＵ）１５は、エン
ジン回転数センサ１６、エンジン負荷センサ１７等から
エンジン回転数およびエンジン負荷の情報を入力し、こ
れらのエンジン運転情報により判断されるエンジン運転
状況に応じ最適な燃料噴射時期および燃料噴射量を演算
し、電磁弁７に開閉信号を送出する。またＥＣＵ１５
は、エンジン回転数やエンジン負荷に応じコモンレール
４から噴射弁６に供給する燃料の圧力を最適にするた
め、圧力センサ１９から入力した圧力信号により高圧燃
料供給ポンプ１の吐出量制御装置１８に制御信号を送出
する。An electronic control unit (ECU) 15 inputs information on engine speed and engine load from an engine speed sensor 16, an engine load sensor 17, etc., and responds to the engine operating condition judged by these engine operating information. The optimum fuel injection timing and fuel injection amount are calculated, and an opening / closing signal is sent to the solenoid valve 7. The ECU 15
Controls the discharge amount control device 18 of the high-pressure fuel supply pump 1 based on the pressure signal input from the pressure sensor 19 in order to optimize the pressure of the fuel supplied from the common rail 4 to the injection valve 6 according to the engine speed and engine load. Send a signal.
【００１９】燃料ポンプ９により燃料タンク１０から吸
い上げられた燃料は高圧燃料供給ポンプ１に供給され加
圧された後、チェック弁２、燃料供給管３を介しコモン
レール４に供給される。コモンレール４は供給された高
圧燃料を蓄圧し高圧に保持する。コモンレール４で蓄圧
された高圧燃料は分岐供給管８を介し各噴射弁６に等圧
に供給される。The fuel sucked up from the fuel tank 10 by the fuel pump 9 is supplied to the high-pressure fuel supply pump 1 and pressurized, and then supplied to the common rail 4 via the check valve 2 and the fuel supply pipe 3. The common rail 4 accumulates the supplied high pressure fuel and holds it at a high pressure. The high pressure fuel accumulated in the common rail 4 is supplied to each injection valve 6 at a constant pressure via the branch supply pipe 8.
【００２０】共鳴器２０内には共鳴室２０ａおよび頸部
通路２０ｂが形成され、共鳴室２０ａは頸部通路２０ｂ
を介し燃料供給管３内に形成される燃料通路と連通して
いる。共鳴器２１内にも共鳴室２１ａおよび頸部通路２
１ｂが形成され、共鳴室２１ａは頸部通路２１ｂを介し
分岐供給管８内に形成される燃料通路と連通している。A resonance chamber 20a and a neck passage 20b are formed in the resonator 20, and the resonance chamber 20a is formed in the neck passage 20b.
Through a fuel passage formed in the fuel supply pipe 3. The resonance chamber 21a and the neck passage 2 are also provided in the resonator 21.
1b is formed, and the resonance chamber 21a communicates with the fuel passage formed in the branch supply pipe 8 via the neck passage 21b.
【００２１】次に、図１の燃料噴射装置の作動について
図２に基づいて説明する。図２に示すように、噴射弁６
のノズルニードル６ａが弁座６ｂに着座することにより
噴射弁６が閉弁し燃料噴射を終了すると、分岐供給管８
内に油撃が生じ圧力波１０１が発生する。圧力波１０１
は分岐供給管８内を音速ａで伝播し、分岐供給管８とコ
モンレール４との接続部１１に到達する。圧力波１０１
は、分岐供給管８からコモンレール４への断面積拡大作
用により接続部１１で反射するとともに位相が反転して
負の圧力波である膨張波１０２となり、分岐供給管８内
を噴射弁６に向けて伝播する。膨張波１０２はノズルニ
ードル６ａと弁座６ｂとの着座部において同位相で反射
され膨張波１０３がコモンレール４に伝播する。接続部
１１において再び断面積拡大作用により膨張波１０３が
位相反転し、圧力波１０４が分岐供給管８内を噴射弁６
に伝播する。Next, the operation of the fuel injection device of FIG. 1 will be described with reference to FIG. As shown in FIG. 2, the injection valve 6
When the injection needle 6a is seated on the valve seat 6b and the injection valve 6 is closed and fuel injection is completed, the branch supply pipe 8
An oil hammer occurs inside and a pressure wave 101 is generated. Pressure wave 101
Propagates in the branch supply pipe 8 at the speed of sound a and reaches the connecting portion 11 between the branch supply pipe 8 and the common rail 4. Pressure wave 101
Is reflected by the connecting portion 11 by the action of expanding the cross-sectional area from the branch supply pipe 8 to the common rail 4 and the phase is inverted to form an expansion wave 102 that is a negative pressure wave, and the inside of the branch supply pipe 8 is directed toward the injection valve 6. Propagate. The expansion wave 102 is reflected at the seating portions of the nozzle needle 6a and the valve seat 6b in the same phase, and the expansion wave 103 propagates to the common rail 4. The expansion wave 103 inverts the phase again due to the action of expanding the cross-sectional area in the connecting portion 11, and the pressure wave 104 flows through the branch supply pipe 8 into the injection valve
Propagate to
【００２２】分岐供給管８内を伝播する圧力脈動波は、
分岐供給管８内を２往復して１周期となる。圧力脈動波
は音速で分岐供給管８内を伝播するため、脈動周波数ｆ
i は、次の数１で表される。The pressure pulsation wave propagating in the branch supply pipe 8 is
Two cycles are made in the branch supply pipe 8 to form one cycle. Since the pressure pulsation wave propagates in the branch supply pipe 8 at the speed of sound, the pulsation frequency f
i is represented by the following equation 1.
【００２３】[0023]
【数１】 [Equation 1]
【００２４】ここでＬi はノズルニードル６ａと弁座６
ｂとの着座部から接続部１１までの通路長を示す。一
方、共鳴器２１の共鳴周波数ｆr は、共鳴室２１ａの容
積Ｖr 、頸部通路２１ｂの通路長Ｌr 、頸部通路２１ｂ
の流路断面積Ｓr により規定され、次の数２により表さ
れる。Here, L i is the nozzle needle 6a and the valve seat 6
The path length from the seated portion with b to the connection portion 11 is shown. On the other hand, the resonance frequency f r of the resonator 21, the volume V r of resonance chambers 21a, path length of the neck passage 21b L r, neck passage 21b
It is defined by the flow path cross-sectional area S r of and is expressed by the following equation 2.
【００２５】[0025]
【数２】 [Equation 2]
【００２６】燃料供給管３内の圧力脈動波についても、
脈動周波数ｆp は、次の数３で表される。Regarding the pressure pulsation wave in the fuel supply pipe 3,
The pulsation frequency f p is expressed by the following equation 3.
【００２７】[0027]
【数３】 (Equation 3)
【００２８】ここでＬp は、コモンレール４とチェック
弁２の着座部との通路長を表す。一方、共鳴器２０の共
鳴周波数ｆr は、共鳴器２１と同様に、共鳴室２０ａの
容積Ｖ r 、頸部通路２０ｂの通路長Ｌr 、頸部通路２０
ｂの流路断面積Ｓr により規定され前記数２により表さ
れる。次に、共鳴器２０について燃料供給管３を伝播す
る圧力脈動波の脈動周波数ｆ p を変化させ、共鳴器２０
の脈動減衰効果について実験した。その結果を図３およ
び図４に示す。図４の横軸、縦軸は対数目盛りである。Where LpCheck with common rail 4
It represents the length of the passage of the valve 2 to the seat. On the other hand, the resonator 20
Ringing frequency frIs the same as the resonator 21 in the resonance chamber 20a.
Volume V r, Passage length L of the neck passage 20br, Neck passage 20
b channel cross-sectional area SrDefined by
Be done. Next, the resonator 20 is propagated through the fuel supply pipe 3.
Pulsation frequency f of pressure pulsation wave pAnd the resonator 20
Experiments were conducted on the pulsation damping effect of. The results are shown in Fig. 3 and
And shown in FIG. The horizontal axis and the vertical axis of FIG. 4 are logarithmic scales.
【００２９】図３に示すように、ｆp ＝ｆr とすると圧
力脈動波の減衰特性は最もよいが、ｆp ＝（１／１．７
５）ｆr の場合も圧力脈動波の減衰特性はよい。ここ
で、共鳴器２０の頸部通路２０ｂを流れる燃料流量ｄＱ
／ｄｔの周波数特性を図４に示す。共鳴器２０は、頸部
通路２０ｂの流れと共鳴器２０の入口部の圧力変化とが
共振することで脈動を減衰する。つまり、共鳴器２０の
入口部の圧力変化△Ｐに対する頸部通路２０ｂの燃料流
量が大きいほど脈動減衰効果が高い。図３および図４よ
り、（１／１．７５）ｆr ≦ｆp ≦１．３ｆr のときｄ
Ｑ／ｄｔは大きな値となり脈動減衰効果が良好である。
逆に、共鳴周波数ｆr が（１／１．３）ｆ p ≦ｆr ≦
１．７５ｆp になるように共鳴器２０を作成すれば、脈
動減衰効果が大きくなる。共鳴器２１についても、ｆp
をｆi に代えて同じ関係式が成立する。As shown in FIG. 3, fp= FrThen pressure
The force pulsation wave has the best damping characteristics, but fp= (1 / 1.7
5) frIn the case of as well, the damping characteristic of the pressure pulsation wave is good. here
And the fuel flow rate dQ flowing through the neck passage 20b of the resonator 20
The frequency characteristic of / dt is shown in FIG. Resonator 20 is neck
The flow in the passage 20b and the pressure change at the inlet of the resonator 20
Resonance damps pulsation. In other words, of the resonator 20
Fuel flow in the neck passage 20b with respect to pressure change ΔP at the inlet
The larger the amount, the higher the pulsation damping effect. See Figure 3 and Figure 4.
, (1 / 1.75) fr≤ fp≦ 1.3frWhen d
Q / dt has a large value and the pulsation damping effect is good.
On the contrary, the resonance frequency frIs (1 / 1.3) f p≤ fr≤
1.75fpIf the resonator 20 is created so that
The dynamic damping effect is increased. Also for the resonator 21, fp
FiInstead, the same relational expression holds.
【００３０】第１実施例では、燃料供給管３および分岐
供給管８ともに共鳴器２０および２１を設置したが、本
発明では、燃料供給管および分岐供給管のいずれか一方
に共鳴器を設置することも可能である。 （第２実施例）本発明の第２実施例を図５に示す。In the first embodiment, the resonators 20 and 21 are installed on both the fuel supply pipe 3 and the branch supply pipe 8, but in the present invention, the resonator is installed on either the fuel supply pipe or the branch supply pipe. It is also possible. (Second Embodiment) A second embodiment of the present invention is shown in FIG.
【００３１】共鳴器３０は、燃料供給管３または分岐供
給管８の途中に配置され、オリフィス３３、共鳴室３
１、オリフィス３２を介し燃料が流通可能である。オリ
フィス３２が第１実施例の共鳴器の頸部通路の作用を
し、オリフィス３２とオリフィス３３との間の空間が共
鳴室３１になる。オリフィス３２の流路断面積Ｓr より
もオリフィス３３の流路断面積Ｓ0 を十分小さくするこ
とにより、燃料供給管３または分岐供給管８内の圧力脈
動波を良好に減衰できる。The resonator 30 is disposed in the middle of the fuel supply pipe 3 or the branch supply pipe 8, and has an orifice 33 and a resonance chamber 3.
1, the fuel can flow through the orifice 32. The orifice 32 acts as the neck passage of the resonator of the first embodiment, and the space between the orifice 32 and the orifice 33 becomes the resonance chamber 31. By making the flow passage cross-sectional area S 0 of the orifice 33 sufficiently smaller than the flow passage cross-sectional area S r of the orifice 32, the pressure pulsation wave in the fuel supply pipe 3 or the branch supply pipe 8 can be favorably damped.
【００３２】コモンレールの燃料下流側の分岐供給管８
に共鳴器３０を取付ける場合、共鳴器３０の燃料上流側
にチェック弁は不要であるが、コモンレールの燃料上流
側の燃料供給管３に共鳴器３０を取付ける場合、高圧燃
料供給ポンプに逆流防止用のチェック弁を設ける必要が
ある。第２実施例では、共鳴器３０の共鳴室３１、オリ
フィス３２、オリフィス３３が燃料供給管３または分岐
供給管８内に形成される燃料通路の一部を形成するよう
に共鳴器３０を取付けるため、エンジンルーム内のスペ
ースに共鳴器を設置し易く共鳴器３０の設置自由度が高
い。Branch supply pipe 8 on the fuel downstream side of the common rail
When the resonator 30 is mounted on the fuel tank, a check valve is not required on the fuel upstream side of the resonator 30, but when the resonator 30 is mounted on the fuel supply pipe 3 on the fuel upstream side of the common rail, the check valve is installed on the high-pressure fuel supply pump to prevent backflow. It is necessary to install a check valve. In the second embodiment, the resonator 30 is mounted so that the resonance chamber 31, the orifice 32, and the orifice 33 of the resonator 30 form a part of the fuel passage formed in the fuel supply pipe 3 or the branch supply pipe 8. It is easy to install the resonator in the space in the engine room, and the degree of freedom in installing the resonator 30 is high.
【００３３】（第３実施例）本発明の第３実施例を図６
に示す。共鳴器４０の燃料下流側にオリフィス４１が形
成され、共鳴器４０の燃料上流側を開閉可能にチェック
弁４３が設けられている。チェック弁４３は圧縮コイル
スプリング４４により燃料上流側の閉弁方向に付勢され
ている。第３実施例は、オリフィス４１が第１実施例の
頸部通路の作用をし、オリフィス４１とチェック弁４３
との間の空間が共鳴室４２になる。チェック弁４３は、
燃料供給時に開弁し、圧力脈動波が反射すると閉弁し燃
料の逆流を防止する。(Third Embodiment) FIG. 6 shows a third embodiment of the present invention.
Shown in An orifice 41 is formed on the fuel downstream side of the resonator 40, and a check valve 43 is provided so that the fuel upstream side of the resonator 40 can be opened and closed. The check valve 43 is biased by a compression coil spring 44 in the valve closing direction on the fuel upstream side. In the third embodiment, the orifice 41 acts as the neck passage of the first embodiment, and the orifice 41 and the check valve 43 are used.
The space between and becomes the resonance chamber 42. The check valve 43 is
It opens when fuel is supplied, and closes when pressure pulsation waves are reflected to prevent back flow of fuel.
【００３４】第３実施例は、第２実施例に較べオリフィ
スが１つだけなので、燃料供給時の圧力損失が小さくな
る。 （第４実施例）本発明の第４実施例を図７に示す。共鳴
器５０の燃料下流側にオリフィス弁５１が設けられてい
る。オリフィス弁５１の中央にはオリフィス弁５１を軸
方向に貫通するオリフィス５１ａが形成されている。オ
リフィス弁５１は圧縮コイルスプリング５２により弁座
５３に付勢されている。共鳴器５０の燃料上流側にはチ
ェック弁５４が設けられ、圧縮コイルスプリング５５に
より燃料上流側の閉弁方向に付勢されている。オリフィ
ス弁５１とチェック弁５４との間に形成される空間が共
鳴室５６になる。燃料供給時、チェック弁５４とともに
オリフィス弁５１も開弁する。オリフィス弁５１が開弁
すると、オリフィス５１ａを燃料が流れるだけでなく、
オリフィス弁５１の径方向外側の外周壁と共鳴器５０の
容器内壁５７とで形成される空間を燃料が流通可能にな
る。圧力脈動波が反射すると、オリフィス弁５１は弁座
５３に着座しオリフィス５１ａだけを燃料が流通可能と
なり、チェック弁５４は閉弁し燃料の逆流を防止する。Since the third embodiment has only one orifice as compared with the second embodiment, the pressure loss during fuel supply is small. (Fourth Embodiment) FIG. 7 shows a fourth embodiment of the present invention. An orifice valve 51 is provided on the fuel downstream side of the resonator 50. An orifice 51a is formed in the center of the orifice valve 51 so as to penetrate the orifice valve 51 in the axial direction. The orifice valve 51 is biased to the valve seat 53 by the compression coil spring 52. A check valve 54 is provided on the fuel upstream side of the resonator 50, and is biased by a compression coil spring 55 in the valve closing direction on the fuel upstream side. A space formed between the orifice valve 51 and the check valve 54 becomes a resonance chamber 56. At the time of fuel supply, the orifice valve 51 is opened together with the check valve 54. When the orifice valve 51 opens, not only the fuel flows through the orifice 51a, but also
Fuel can flow through the space formed by the outer peripheral wall of the orifice valve 51 on the radially outer side and the inner wall 57 of the container of the resonator 50. When the pressure pulsation wave is reflected, the orifice valve 51 is seated on the valve seat 53 and the fuel can flow only through the orifice 51a, and the check valve 54 is closed to prevent the backflow of the fuel.
【００３５】第４実施例では、燃料供給時にオリフィス
弁５１が開弁し燃料供給量を増加できるので、燃料供給
時の圧力損失をさらに低下することができる。 （第５実施例）本発明の第５実施例を図８に示す。第５
実施例は、第４実施例の共鳴器と同一構成であるチェッ
ク弁を有する共鳴器５０ａおよび５０ｂを燃料供給管３
および分岐供給管８に取付けたものである。チェック弁
を有する共鳴器５０ａをコモンレール４の上流側の燃料
供給管３に取付ける場合、共鳴器５０ａ内のチェック弁
以外に高圧燃料供給ポンプ１に逆流防止用のチェク弁を
設ける必要はない。In the fourth embodiment, since the orifice valve 51 is opened at the time of fuel supply and the fuel supply amount can be increased, the pressure loss at the time of fuel supply can be further reduced. (Fifth Embodiment) FIG. 8 shows a fifth embodiment of the present invention. Fifth
In the embodiment, the fuel supply pipe 3 is provided with the resonators 50a and 50b having a check valve having the same structure as the resonator of the fourth embodiment.
And the branch supply pipe 8. When the resonator 50a having a check valve is attached to the fuel supply pipe 3 on the upstream side of the common rail 4, it is not necessary to provide a check valve for backflow prevention in the high-pressure fuel supply pump 1 other than the check valve in the resonator 50a.
【００３６】チェック弁を有する共鳴器５０ｂをコモン
レール４の燃料下流側の分岐供給管８に取付けると、噴
射弁６で反射した圧力脈動波は共鳴器５０ｂ内のチェッ
ク弁で反射され断面積拡大作用を受けず同一位相で噴射
弁６に向けて反射される。このため、圧力脈動波の１周
期は２Ｌi となり脈動周波数ｆi は次の数４で表され
る。共鳴器５０ｂの共鳴周波数ｆr は前述の数２で表さ
れる。When the resonator 50b having a check valve is attached to the branch supply pipe 8 on the fuel downstream side of the common rail 4, the pressure pulsation wave reflected by the injection valve 6 is reflected by the check valve in the resonator 50b and the cross-sectional area expanding action is performed. It is not received and is reflected toward the injection valve 6 in the same phase. Therefore, one cycle of the pressure pulsation wave is 2L i , and the pulsation frequency f i is expressed by the following equation 4. Resonance frequency f r of the resonator 50b is expressed by two numbers of the foregoing.
【００３７】[0037]
【数４】 [Equation 4]
【００３８】燃料供給管３の脈動周波数ｆp および共鳴
器５０ａの共鳴周波数ｆr はそれぞれ数３および数２で
表される。第５実施例では、第４実施例と同一構成であ
る共鳴器５０ａおよび５０ｂをそれぞれ燃料供給管３お
よび分岐供給管８に取付けたが、本発明では、第２実施
例または第３実施例の共鳴器を取付けることは可能であ
り、第１実施例〜第４実施例の共鳴器を組み合わせて用
いることも可能である。The pulsation frequency f p of the fuel supply pipe 3 and the resonance frequency f r of the resonator 50a are expressed by equations 3 and 2, respectively. In the fifth embodiment, the resonators 50a and 50b having the same structure as in the fourth embodiment are attached to the fuel supply pipe 3 and the branch supply pipe 8, respectively, but in the present invention, the resonators of the second embodiment and the third embodiment are mounted. A resonator can be attached, and the resonators of the first to fourth embodiments can be used in combination.
【図１】本発明の第１実施例による燃料噴射装置を示す
構成図である。FIG. 1 is a configuration diagram showing a fuel injection device according to a first embodiment of the present invention.
【図２】第１実施例の分岐供給管における圧力波の伝播
を示す模式図である。FIG. 2 is a schematic diagram showing the propagation of pressure waves in the branch supply pipe of the first embodiment.
【図３】圧力脈動波の減衰特性を示す特性図である。FIG. 3 is a characteristic diagram showing a damping characteristic of a pressure pulsation wave.
【図４】脈動周波数と共鳴器の流量との関係を示す特性
図である。FIG. 4 is a characteristic diagram showing a relationship between a pulsation frequency and a flow rate of a resonator.
【図５】本発明の第２実施例による共鳴器を示す模式的
断面図である。FIG. 5 is a schematic sectional view showing a resonator according to a second embodiment of the present invention.
【図６】本発明の第３実施例による共鳴器を示す模式的
断面図である。FIG. 6 is a schematic sectional view showing a resonator according to a third embodiment of the present invention.
【図７】本発明の第４実施例による共鳴器を示す模式的
断面図である。FIG. 7 is a schematic sectional view showing a resonator according to a fourth embodiment of the present invention.
【図８】第４実施例の共鳴器を適用した本発明の第５実
施例による燃料噴射装置を示す構成図である。FIG. 8 is a configuration diagram showing a fuel injection device according to a fifth embodiment of the present invention to which the resonator of the fourth embodiment is applied.
【図９】従来の燃料噴射装置を示す構成図である。FIG. 9 is a configuration diagram showing a conventional fuel injection device.
１ 高圧燃料供給ポンプ（燃料供給ポンプ） ２ チェック弁 ３ 燃料供給管 ４ コモンレール ５ エンジン ６ 噴射弁 ７ 電磁弁 ８ 分岐供給管 ２０ 共鳴器 ２０ａ 共鳴室 ２０ｂ 頸部通路 ２１ 共鳴器 ２１ａ 共鳴室 ２１ｂ 頸部通路 ３０ 共鳴器 ３１ 共鳴室 ３２ オリフィス（第１のオリフィス） ３３ オリフィス（第２のオリフィス） ４０ 共鳴器 ４１ オリフィス ４３ チェック弁 ４４ 圧縮コイルスプリング（付勢手段） ５０ 共鳴器 ５１ オリフィス弁 ５１ａ オリフィス ５２ 圧縮コイルスプリング（第１の付勢手段） ５３ 弁座 ５４ チェック弁 ５５ 圧縮コイルスプリング（第２の付勢手段） 1 High-pressure fuel supply pump (fuel supply pump) 2 Check valve 3 Fuel supply pipe 4 Common rail 5 Engine 6 Injection valve 7 Electromagnetic valve 8 Branch supply pipe 20 Resonator 20a Resonance chamber 20b Neck passage 21 Resonator 21a Resonance chamber 21b Neck Passage 30 Resonator 31 Resonance chamber 32 Orifice (first orifice) 33 Orifice (second orifice) 40 Resonator 41 Orifice 43 Check valve 44 Compression coil spring (biasing means) 50 Resonator 51 Orifice valve 51a Orifice 52 Compression Coil spring (first urging means) 53 Valve seat 54 Check valve 55 Compression coil spring (second urging means)
Claims (5)
ンレールと、 前記燃料供給ポンプと前記コモンレールとを接続し、前
記燃料供給ポンプから前記コモンレールに燃料を供給可
能な第１の燃料通路を有する燃料供給管と、 内燃機関の各気筒毎に設けられる噴射弁と、 前記コモンレールと前記噴射弁とを接続し、前記コモン
レールで蓄圧された高圧燃料を前記噴射弁に供給可能な
第２の燃料通路を有する分岐供給管と、 頸部通路と共鳴室とを有する共鳴器であって、前記燃料
供給管および前記分岐供給管の少なくともいずれか一方
に設けられ、前記第１の燃料通路または前記第２の燃料
通路と前記頸部通路を介して前記共鳴室が連通する共鳴
器と、 を備えることを特徴とする燃料噴射装置。1. A fuel supply pump, a common rail for accumulating fuel supplied from the fuel supply pump, the fuel supply pump and the common rail are connected, and fuel can be supplied from the fuel supply pump to the common rail. A fuel supply pipe having a first fuel passage, an injection valve provided for each cylinder of an internal combustion engine, the common rail and the injection valve are connected, and high-pressure fuel accumulated in the common rail is supplied to the injection valve. A branch supply pipe having a possible second fuel passage, and a resonator having a neck passage and a resonance chamber, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe. The fuel injection device, further comprising: a resonator in which the resonance chamber communicates with the fuel passage or the second fuel passage through the neck passage.
頸部通路と共鳴室とを有する共鳴器であって、前記燃料
供給管および前記分岐供給管の少なくともいずれか一方
に設けられ、前記第１の燃料通路または前記第２の燃料
通路と前記頸部通路を介して前記共鳴室が連通する共鳴
器に代えて、燃料下流側に形成される第１のオリフィ
ス、燃料上流側に形成される第２のオリフィス、およ
び、前記第１のオリフィスと前記第２のオリフィスとの
間に形成される共鳴室を有する共鳴器であって、前記燃
料供給管および前記分岐供給管の少なくともいずれか一
方に設けられ、前記第１のオリフィスと前記第２のオリ
フィスと前記共鳴室とは前記第１の燃料通路または前記
第２の燃料通路の一部を形成し前記第１のオリフィスお
よび前記第２のオリフィスのいずれか一方は他方よりも
径が小さい共鳴器を備えることを特徴とする燃料噴射装
置。2. The fuel injection device according to claim 1, wherein
A resonator having a neck passage and a resonance chamber, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe, the first fuel passage or the second fuel passage, and the neck portion. A first orifice formed on the fuel downstream side, a second orifice formed on the fuel upstream side, and the first orifice and the first orifice instead of the resonator communicating with the resonance chamber via a passage. A resonator having a resonance chamber formed between the first orifice and the second orifice, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe. The resonance chamber forms a part of the first fuel passage or the second fuel passage, and one of the first orifice and the second orifice includes a resonator having a smaller diameter than the other. Fuel injection device according to claim Rukoto.
頸部通路と共鳴室とを有する共鳴器であって、前記燃料
供給管および前記分岐供給管の少なくともいずれか一方
に設けられ、前記第１の燃料通路または前記第２の燃料
通路と前記頸部通路を介して前記共鳴室が連通する共鳴
器に代えて、燃料上流側に設けられ燃料上流側を閉弁方
向とするチェック弁とこのチェック弁を燃料上流側に付
勢する付勢手段とを備え、燃料下流側にオリフィスを有
するとともに前記オリフィスと前記チェック弁との間に
形成される共鳴室を有する共鳴器であって、前記燃料供
給管および前記分岐供給管の少なくともいずれか一方に
設けられ、前記オリフィスと前記共鳴室とは前記第１の
燃料通路または前記第２の燃料通路の一部を形成する共
鳴器を備えることを特徴とする燃料噴射装置。3. The fuel injection device according to claim 1, wherein
A resonator having a neck passage and a resonance chamber, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe, the first fuel passage or the second fuel passage, and the neck portion. Instead of the resonator communicating with the resonance chamber via the passage, a check valve provided on the fuel upstream side and having the fuel upstream side in the valve closing direction and a biasing means for biasing the check valve to the fuel upstream side are provided. A resonator having an orifice on the fuel downstream side and having a resonance chamber formed between the orifice and the check valve, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe. The fuel injector, wherein the orifice and the resonance chamber each include a resonator forming a part of the first fuel passage or the second fuel passage.
頸部通路と共鳴室とを有する共鳴器であって、前記燃料
供給管および前記分岐供給管の少なくともいずれか一方
に設けられ、前記第１の燃料通路または前記第２の燃料
通路と前記頸部通路を介して前記共鳴室が連通する共鳴
器に代えて、軸方向に貫通するオリフィスを有し燃料下
流側に設けられるオリフィス弁と前記オリフィス弁を付
勢する第１の付勢手段と前記オリフィス弁が当接可能な
弁座と燃料上流側に設けられるチェック弁とこのチェッ
ク弁を燃料上流側に付勢する第２の付勢手段とを備え、
前記オリフィス弁と前記チェック弁との間に形成される
共鳴室を有する共鳴器であって、前記燃料供給管および
前記分岐供給管の少なくともいずれか一方に設けられ、
前記オリフィスと前記共鳴室とは前記第１の燃料通路ま
たは前記第２の燃料通路の一部を形成する共鳴器を備え
ることを特徴とする燃料噴射装置。4. The fuel injection device according to claim 1, wherein
A resonator having a neck passage and a resonance chamber, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe, the first fuel passage or the second fuel passage, and the neck portion. Instead of the resonator in which the resonance chamber communicates via a passage, an orifice valve that has an axially penetrating orifice and is provided on the fuel downstream side, and a first biasing unit that biases the orifice valve and the orifice A valve seat with which the valve can come into contact, a check valve provided on the fuel upstream side, and a second urging means for urging the check valve toward the fuel upstream side,
A resonator having a resonance chamber formed between the orifice valve and the check valve, the resonator being provided in at least one of the fuel supply pipe and the branch supply pipe,
The fuel injection device, wherein the orifice and the resonance chamber each include a resonator forming a part of the first fuel passage or the second fuel passage.
料通路に発生する圧力脈動波の周波数をｆ、前記共鳴器
の共鳴周波数をｆr とすると、（１／１．３）ｆ≦ｆr
≦１．７５ｆであることを特徴とする請求項１、２、３
または４記載の燃料噴射装置。5. When the frequency of the pressure pulsation wave generated in the first fuel passage or the second fuel passage is f and the resonance frequency of the resonator is f r , (1 / 1.3) f ≦ f r
≦ 1.75f, Claims 1, 2, 3
Alternatively, the fuel injection device according to item 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15445394A JP3395371B2 (en) | 1994-07-06 | 1994-07-06 | Fuel injection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15445394A JP3395371B2 (en) | 1994-07-06 | 1994-07-06 | Fuel injection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0821333A true JPH0821333A (en) | 1996-01-23 |
| JP3395371B2 JP3395371B2 (en) | 2003-04-14 |
Family
ID=15584560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15445394A Expired - Fee Related JP3395371B2 (en) | 1994-07-06 | 1994-07-06 | Fuel injection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3395371B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2356020A (en) * | 1999-11-02 | 2001-05-09 | Delphi Tech Inc | Pressure wave damping device for use in a hydraulic system, eg a fuel injection system |
| WO2002001064A1 (en) * | 2000-06-29 | 2002-01-03 | Bosch Automotive Systems Corporation | Accumulator fuel feed device |
| EP1403510A1 (en) * | 2002-09-30 | 2004-03-31 | Delphi Technologies, Inc. | High pressure fuel injection system with means for pressure wave damping |
| JP2004132231A (en) * | 2002-10-09 | 2004-04-30 | Usui Kokusai Sangyo Kaisha Ltd | Method and apparatus for attenuating pressure pulsation of opposed engine |
| JP2005530949A (en) * | 2002-06-21 | 2005-10-13 | インターナショナル エンジン インテレクチュアル プロパティー カンパニー リミテッド ライアビリティ カンパニー | Pressure wave attenuator for rail |
| JP2012251438A (en) * | 2011-05-31 | 2012-12-20 | Aisan Industry Co Ltd | Fuel pressure adjusting device |
| JP2013518208A (en) * | 2010-01-25 | 2013-05-20 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | Injector with reduced pressure oscillation |
| WO2013127668A1 (en) * | 2012-02-27 | 2013-09-06 | Continental Automotive Gmbh | Fuel supply system for an internal combustion engine |
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| JPH04342868A (en) * | 1991-05-20 | 1992-11-30 | Nippondenso Co Ltd | Fuel injector |
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| JPS4811724B1 (en) * | 1968-10-08 | 1973-04-16 | ||
| JPS5623558A (en) * | 1979-05-11 | 1981-03-05 | Bendix Corp | Fuel feeder and method of measuring fuel |
| JPS56105659U (en) * | 1980-11-27 | 1981-08-18 | ||
| JPS6018691A (en) * | 1983-07-11 | 1985-01-30 | 株式会社日立製作所 | Pressure pulsation reducer |
| JPH04342868A (en) * | 1991-05-20 | 1992-11-30 | Nippondenso Co Ltd | Fuel injector |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2356020A (en) * | 1999-11-02 | 2001-05-09 | Delphi Tech Inc | Pressure wave damping device for use in a hydraulic system, eg a fuel injection system |
| WO2002001064A1 (en) * | 2000-06-29 | 2002-01-03 | Bosch Automotive Systems Corporation | Accumulator fuel feed device |
| JP2005530949A (en) * | 2002-06-21 | 2005-10-13 | インターナショナル エンジン インテレクチュアル プロパティー カンパニー リミテッド ライアビリティ カンパニー | Pressure wave attenuator for rail |
| JP2010096189A (en) * | 2002-06-21 | 2010-04-30 | Internatl Engine Intellectual Property Co Llc | Pressure wave attenuator for rail |
| KR101148519B1 (en) * | 2002-06-21 | 2012-05-25 | 인터내셔널 엔진 인터렉츄얼 프로퍼티 캄파니, 엘엘씨 | Pressure wave attenuator for a rail |
| EP1403510A1 (en) * | 2002-09-30 | 2004-03-31 | Delphi Technologies, Inc. | High pressure fuel injection system with means for pressure wave damping |
| FR2845130A1 (en) * | 2002-09-30 | 2004-04-02 | Delphi Tech Inc | HIGH PRESSURE FUEL INJECTION SYSTEM EQUIPPED WITH PRESSURE WAVE MATERIALS AND SOFTWARE |
| JP2004132231A (en) * | 2002-10-09 | 2004-04-30 | Usui Kokusai Sangyo Kaisha Ltd | Method and apparatus for attenuating pressure pulsation of opposed engine |
| JP2013518208A (en) * | 2010-01-25 | 2013-05-20 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | Injector with reduced pressure oscillation |
| JP2012251438A (en) * | 2011-05-31 | 2012-12-20 | Aisan Industry Co Ltd | Fuel pressure adjusting device |
| WO2013127668A1 (en) * | 2012-02-27 | 2013-09-06 | Continental Automotive Gmbh | Fuel supply system for an internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3395371B2 (en) | 2003-04-14 |
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