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JP2009222056A - Engine fuel supply device - Google Patents

Engine fuel supply device Download PDF

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Publication number
JP2009222056A
JP2009222056A JP2009020012A JP2009020012A JP2009222056A JP 2009222056 A JP2009222056 A JP 2009222056A JP 2009020012 A JP2009020012 A JP 2009020012A JP 2009020012 A JP2009020012 A JP 2009020012A JP 2009222056 A JP2009222056 A JP 2009222056A
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Prior art keywords
pressure
fuel
fuel supply
injector
control
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Ceased
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JP2009020012A
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Japanese (ja)
Inventor
Gerhard Domberger
ゲルハルト・ドンベールゲール
Ulrich Doebler
ウルリヒ・ドブラー
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MAN Energy Solutions SE
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MAN Diesel SE
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Publication of JP2009222056A publication Critical patent/JP2009222056A/en
Ceased legal-status Critical Current

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    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • 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
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • 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
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0045—Three-way valves
    • 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
    • F02M63/0205—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 for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
    • F02M63/0215—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 for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine by draining or closing fuel conduits
    • 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
    • F02M2200/18—Fuel-injection apparatus having means for maintaining safety not otherwise provided for
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

【課題】新式燃料供給装置を提供する。
【解決手段】低圧領域と高圧ポンプを含むポンプ装置を備えた燃料供給装置。燃料は低圧から高圧領域へ運搬され、ポンプ装置と気筒間に配されたインジェクタ領域には蓄圧システム(2)が備わり、当該システムもポンプ装置と接続され、高圧下に置かれる高圧燃料導管(3)を介してインジェクタ(1)と接続され、当該インジェクタを蓄圧システムと接続する導管にはインジェクタに燃料を供給する切換装置(4)が配されている。本発明では制御装置(8)がインジェクタと協働し、切換装置開放時にインジェクタに接続される導管の脇を通過する燃料は制御室(6)に導入可能であり、バイパス燃料はインジェクタに接続される導管から分岐した導管(9)を経て遅れて制御装置に供給でき、インジェクタ開放後、バイパス導管を経て排出される燃料は制御装置を移動させ制御室から排出可能となり、燃料供給装置の低圧領域に供給可能となる。
【選択図】図１A new fuel supply apparatus is provided.
A fuel supply apparatus including a pump device including a low pressure region and a high pressure pump. The fuel is transported from the low pressure to the high pressure region, and the injector region arranged between the pump device and the cylinder is equipped with a pressure accumulating system (2), which is also connected to the pump device and is placed under high pressure (3 ) And a switching device (4) for supplying fuel to the injector is arranged in a conduit connecting the injector to the pressure accumulating system. In the present invention, the control device (8) cooperates with the injector, and when passing through the switching device, the fuel passing through the side of the conduit connected to the injector can be introduced into the control chamber (6), and the bypass fuel is connected to the injector. The fuel can be supplied to the control device after a delay from the conduit (9) branched off from the conduit, and the fuel discharged through the bypass conduit after the injector is opened can be discharged from the control chamber by moving the control device. Can be supplied.
[Selection] Figure 1

Description

本発明は請求項１のおいて書き部分に記載のエンジンの燃料供給装置、すなわちコモンレール式燃料供給装置に関する。   The present invention relates to a fuel supply device for an engine according to claim 1, that is, a common rail fuel supply device.

特許文献１には、複数の気筒を備えたエンジン、すなわち重油で運転される船舶用ディーゼルエンジンが開示されており、当該エンジンでは、各気筒にコモンレール式燃料供給装置のインジェクタが配設されている。当該インジェクタを介して、エンジンの各気筒に燃料が噴射可能である。特許文献１に記載されたコモンレール式燃料供給装置は、燃料をコモンレール式燃料供給装置の低圧領域から当該装置の高圧領域に運搬するために、複数の高圧ポンプを有するポンプ装置を含んでおり、当該ポンプ装置と前記インジェクタとの間の高圧領域には、持続的に高圧下に置かれている蓄圧システムが設けられている。当該持続的に高圧下に置かれている蓄圧システムはコモンレールとも称され、特許文献１によれば、複数の蓄圧ユニットを有し、やはり持続的に高圧下に置かれている高圧燃料導管を介して、ポンプ装置と接続されている。当該蓄圧システムはさらに、噴射のタイミングに応じて間欠的に高圧下に置かれる高圧燃料導管を介して、前記インジェクタに接続されている。インジェクタを蓄圧システムと接続する、噴射のタイミングに応じて間欠的に高圧下に置かれる高圧燃料導管には、３／２方向制御弁として形成される切換装置が配設され、当該切換装置は噴射のタイミングに応じてインジェクタに燃料を供給する。切換装置で生じる制御時のリークすなわち燃料は、特許文献１によれば、絞り弁および圧力維持弁を介して排出されうる。   Patent Document 1 discloses an engine having a plurality of cylinders, that is, a marine diesel engine operated with heavy oil. In the engine, an injector of a common rail fuel supply device is provided in each cylinder. . Fuel can be injected into each cylinder of the engine via the injector. The common rail fuel supply device described in Patent Document 1 includes a pump device having a plurality of high pressure pumps for transporting fuel from the low pressure region of the common rail fuel supply device to the high pressure region of the device, A high pressure region between the pump device and the injector is provided with a pressure accumulating system that is continuously placed under high pressure. The pressure accumulating system that is continuously placed under high pressure is also called a common rail. According to Patent Document 1, a plurality of pressure accumulating units are provided and are connected via a high-pressure fuel conduit that is also placed under high pressure. And connected to the pump device. The accumulator system is further connected to the injector via a high-pressure fuel conduit that is intermittently placed under high pressure according to the timing of injection. A switching device formed as a 3 / 2-directional control valve is disposed in a high-pressure fuel conduit that connects the injector to the pressure accumulating system and is intermittently placed under high pressure according to the timing of injection. The fuel is supplied to the injector in accordance with the timing. According to Patent Document 1, the leakage at the time of control that occurs in the switching device, that is, the fuel, can be discharged through the throttle valve and the pressure maintaining valve.

独国特許発明第10157135号明細書German patent invention No. 10157135 specification

上記の点に鑑み、本発明の課題は、エンジンの新式燃料供給装置、すなわち改良されたコモンレール式燃料供給装置を提供することにある。   In view of the above points, an object of the present invention is to provide a new fuel supply device for an engine, that is, an improved common rail fuel supply device.

上記の課題は、請求項１に記載された燃料供給装置によって解決される。   The above-described problem is solved by the fuel supply device described in claim 1.

本発明では、各インジェクタと制御装置とが協働するため、各インジェクタに配設された切換装置の開放時に、各インジェクタと接続されている高圧燃料導管の脇を通過して流れる量の制御燃料は、制御装置によって開閉可能な制御室に導入可能である。このとき、バイパスされた燃料は、各インジェクタに接続された高圧燃料導管から分岐したバイパス導管を経由して、遅れて制御装置に供給可能であり、それによって各インジェクタの開放後、当該バイパス導管を経由して排出されたバイパス燃料は当該制御装置を動作させ、前記制御燃料は制御室から排出可能となり、当該燃料供給装置の低圧領域に供給可能となる。   In the present invention, since each injector and the control device cooperate with each other, when the switching device disposed in each injector is opened, the amount of control fuel flowing through the side of the high-pressure fuel conduit connected to each injector is controlled. Can be introduced into a control room that can be opened and closed by a control device. At this time, the bypassed fuel can be supplied to the control device via the bypass conduit branched from the high-pressure fuel conduit connected to each injector with a delay, so that the bypass conduit is opened after each injector is opened. The bypass fuel discharged via the control device operates the control device, and the control fuel can be discharged from the control chamber and can be supplied to the low pressure region of the fuel supply device.

本発明に係る燃料供給装置では、切換時期に応じた流量の制限が実現されうる。このために制御装置は、バイパス燃料によって当該制御装置に累加された圧力によって移動可能であり、それによって、まず制御燃料が収集される制御室は前記制御装置の動作後、燃料供給装置の低圧領域に運び出される。このときバイパス燃料はバイパス導管を経由して前記制御装置に遅れて供給可能であり、それによって、まず最初に、対応するインジェクタを開放するのに十分な圧力を形成することができる。当該インジェクタの開放後初めて、前記制御装置は前記制御室を前記燃料供給装置の低圧領域と接続するために動作させられる。   In the fuel supply device according to the present invention, the restriction of the flow rate according to the switching timing can be realized. For this purpose, the control device can be moved by the pressure accumulated in the control device by the bypass fuel, so that the control chamber in which the control fuel is first collected is the low pressure region of the fuel supply device after the operation of the control device. To be carried to. At this time, the bypass fuel can be supplied to the control device via the bypass conduit with a delay, so that first of all, a pressure sufficient to open the corresponding injector can be created. Only after the injector has been opened is the control device operated to connect the control chamber to the low pressure region of the fuel supply device.

本発明のさらなる有利な構成によれば、制御装置には圧力維持装置が組み込まれており、当該圧力維持装置は前記制御装置がバイパス燃料によって生じた圧力によって動作させられたときに、制御燃料によって生じた圧力によって、ばね部材によって提供される弾性に抗して移動可能であり、それによって制御室は制御燃料を排出するために、燃料供給装置の低圧領域と接続される。   According to a further advantageous configuration of the invention, the control device incorporates a pressure maintenance device which is controlled by the control fuel when the control device is operated by the pressure generated by the bypass fuel. The resulting pressure is movable against the elasticity provided by the spring member, whereby the control chamber is connected to the low pressure area of the fuel supply device for discharging the control fuel.

本発明のさらなる好適な構成は、個々の従属請求項と後続の詳細な説明に記載されている。本発明の実施例については、以下に図を用いて詳細に説明するが、本発明はこれに限定されない。   Further preferred configurations of the invention are described in the individual dependent claims and the subsequent detailed description. Examples of the present invention will be described in detail below with reference to the drawings, but the present invention is not limited to these.

エンジンのインジェクタ領域における、本発明に係るコモンレール式燃料供給装置の高圧領域の一部概略図である。It is a partial schematic diagram of the high-pressure region of the common rail fuel supply device according to the present invention in the injector region of the engine. 図１の部分詳細図である。FIG. 2 is a partial detail view of FIG. 1. 図１の部分詳細図である。FIG. 2 is a partial detail view of FIG. 1.

本発明は、エンジン、特に重油で運転される船舶用ディーゼルエンジンのコモンレール式燃料供給装置に関する。コモンレール式燃料供給装置には、低圧領域と高圧領域とが備わっている。   The present invention relates to a common rail fuel supply device for an engine, particularly a marine diesel engine operated with heavy oil. The common rail fuel supply device includes a low pressure region and a high pressure region.

コモンレール式燃料供給装置の高圧領域は、少なくとも１つの高圧ポンプを有するポンプ装置と、少なくとも１つの蓄圧ユニットを有する蓄圧システムとを含み、当該ポンプ装置は燃料を低圧領域から高圧領域へと運搬し、少なくとも１つの高圧燃料導管を介して前記蓄圧システムと接続されている。   The high pressure region of the common rail fuel supply device includes a pump device having at least one high pressure pump and a pressure accumulation system having at least one pressure accumulation unit, the pump device carrying fuel from the low pressure region to the high pressure region, The accumulator system is connected via at least one high pressure fuel conduit.

蓄圧システムと、当該蓄圧システムをポンプ装置に接続する単数または複数の高圧燃料導管とは、持続的に高い作動圧力下に置かれる。燃料は蓄圧システムからインジェクタを経由して気筒へ噴射可能であり、各インジェクタはこのとき、少なくとも１つの高圧燃料導管を介して蓄圧システムと接続されており、当該高圧燃料導管はエンジンの噴射のタイミングに応じて間欠的に高圧下に置かれる。   The accumulator system and the one or more high-pressure fuel conduits connecting the accumulator system to the pump device are placed under a continuously high operating pressure. Fuel can be injected from the pressure accumulator system into the cylinders via the injectors, each injector being connected to the pressure accumulator system via at least one high pressure fuel conduit at this time. Depending on the situation, it is intermittently placed under high pressure.

図１は、インジェクタ１の領域におけるコモンレール式燃料供給装置の高圧領域の一部概略図で、インジェクタ１は、エンジンの噴射のタイミングに応じて間欠的に高圧下に置かれる高圧燃料導管３を介して、コモンレールとも称される蓄圧システム２に接続されている。   FIG. 1 is a partial schematic view of a high-pressure region of a common rail fuel supply system in the region of an injector 1. The injector 1 is connected via a high-pressure fuel conduit 3 that is intermittently placed under high pressure according to the timing of engine injection. The pressure accumulation system 2 is also called a common rail.

高圧燃料導管３には切換装置４が配設されており、当該切換装置は図示された実施例では、３／２方向制御弁として具現化されている。切換装置４はエンジンの噴射のタイミングに応じて、燃料導管３を通過する燃料フローを開放または閉止する。蓄圧装置２は、持続的に高圧下に置かれた高圧燃料導管５を介してポンプ装置に接続されている。   The high-pressure fuel conduit 3 is provided with a switching device 4, which in the illustrated embodiment is embodied as a 3 / 2-directional control valve. The switching device 4 opens or closes the fuel flow that passes through the fuel conduit 3 in accordance with the injection timing of the engine. The pressure accumulator 2 is connected to the pump device via a high-pressure fuel conduit 5 that is continuously placed under high pressure.

切換装置４の領域では、切換プロセスに際して、すなわち開閉時に、制御時のリークと称される制御燃料がインジェクタ１に接続する高圧燃料導管３の脇を通過して制御室６へ排出され、制御室６は導管７を介して、燃料供給装置の低圧領域に接続されうる。   In the area of the switching device 4, during the switching process, that is, at the time of opening and closing, the control fuel, which is referred to as leakage during control, passes through the side of the high-pressure fuel conduit 3 connected to the injector 1 and is discharged into the control chamber 6. 6 can be connected via a conduit 7 to the low pressure region of the fuel supply device.

本発明では、図示された実施例では制御弁として形成されている制御装置８はインジェクタ１と協働し、それによって制御装置８は制御室６を燃料供給装置の低圧領域と接続するか、あるいは当該低圧領域から分離する。すなわち、インジェクタ１の開放後は不要となるバイパス燃料は、インジェクタ１に接続する高圧燃料導管３から分岐したバイパス導管９を経由して、遅れて制御装置８に供給されうるのであり、それゆえインジェクタ１の開放後、バイパス導管９を経由して排出されるバイパス燃料は制御装置８を、図１に示された位置から図２に示された位置へと移動させ、制御室６は燃料供給装置の低圧領域と接続され、制御燃料は制御室６から燃料供給装置の低圧領域に排出されうる。   In the present invention, the control device 8, which is formed as a control valve in the illustrated embodiment, cooperates with the injector 1, whereby the control device 8 connects the control chamber 6 to the low pressure region of the fuel supply device, or Separate from the low pressure region. That is, the bypass fuel that becomes unnecessary after the injector 1 is opened can be supplied to the control device 8 via the bypass conduit 9 branched from the high-pressure fuel conduit 3 connected to the injector 1, and hence the injector. After the opening of 1, the bypass fuel discharged via the bypass conduit 9 moves the control device 8 from the position shown in FIG. 1 to the position shown in FIG. The control fuel can be discharged from the control chamber 6 to the low pressure region of the fuel supply device.

図１によれば、バイパス燃料導管９は、インジェクタ１に接続する高圧燃料導管３から切換装置４の下流において分岐している。高圧燃料導管９には絞り弁１０が組み込まれており、それによってインジェクタ１の開放と制御装置８の移動との間に遅延が作り出される。   According to FIG. 1, the bypass fuel conduit 9 branches off from the high-pressure fuel conduit 3 connected to the injector 1 downstream of the switching device 4. A throttle valve 10 is incorporated in the high pressure fuel conduit 9, thereby creating a delay between the opening of the injector 1 and the movement of the control device 8.

図示された実施例では、バイパス燃料によって制御装置８に加えられた圧力は、制御装置８をばね部材１１によって提供される弾性に抗して摺動させ、それによって制御室６は制御燃料を排出するために燃料供給装置の低圧領域と接続される。   In the illustrated embodiment, the pressure applied to the control device 8 by the bypass fuel causes the control device 8 to slide against the elasticity provided by the spring member 11 so that the control chamber 6 discharges the control fuel. Connected to the low pressure region of the fuel supply device.

それに従い、切換装置４の開放時には制御装置８は図１に示された位置にあって、ばね部材１１によって押圧されており、制御室６を燃料供給装置の低圧領域から分離する。   Accordingly, when the switching device 4 is opened, the control device 8 is in the position shown in FIG. 1 and is pressed by the spring member 11 to separate the control chamber 6 from the low pressure region of the fuel supply device.

開放されている間、制御時のリークとも称される制御燃料は切換装置４の脇を通過し、制御室６に収集される。蓄圧システム２が蓄えたシステムの圧力は、専らインジェクタ１によって利用され、噴射弁として形成されたインジェクタ１を開放する。時間的に遅れて、バイパス燃料導管９を経由してバイパス燃料１０が制御装置８に供給され、それによって制御装置８は図１に示された位置から図２に示された位置に移動され、制御室６は燃料供給装置の低圧領域と接続され、その結果、制御燃料は低圧領域に排出され、制御室６から排出されうる。これによって、切換装置４を閉止するために、制御室でのスムーズな減圧が可能になる。噴射停止期間には、制御装置８はばね部材１１によって、図２に示された位置から図１に示された位置に移動される。   While being open, the control fuel, also referred to as leakage during control, passes by the switching device 4 and is collected in the control chamber 6. The pressure of the system stored by the pressure accumulating system 2 is exclusively used by the injector 1 to open the injector 1 formed as an injection valve. Delayed in time, the bypass fuel 10 is supplied to the control device 8 via the bypass fuel conduit 9, whereby the control device 8 is moved from the position shown in FIG. 1 to the position shown in FIG. The control chamber 6 is connected to the low pressure region of the fuel supply device, so that the control fuel can be discharged to the low pressure region and discharged from the control chamber 6. Thereby, since the switching device 4 is closed, a smooth pressure reduction in the control room is possible. During the injection stop period, the controller 8 is moved by the spring member 11 from the position shown in FIG. 2 to the position shown in FIG.

ここでは、制御装置８を開放するのに必要な圧力が、インジェクタ１を開放するのに必要な圧力よりも小さいことが重要である。そうすれば故障が生じた場合に、切換装置４が密閉されていないときリークが制御されずに、インジェクタ１を介してエンジンの燃焼室に噴射されることがないからである。   Here, it is important that the pressure required to open the control device 8 is smaller than the pressure required to open the injector 1. By doing so, when a failure occurs, when the switching device 4 is not sealed, the leak is not controlled and is not injected into the combustion chamber of the engine via the injector 1.

本発明に係る燃料供給装置のさらなる好適な構成については、以下に図３を用いて説明する。図３は、図１および図２の制御装置８とばね部材１１とを示した図である。図３によると、制御装置８には圧力維持弁として形成された圧力維持装置１２が組み込まれている。圧力維持装置１２はばね部材１４とともに、制御装置８の空洞１３に受容されている。   The further suitable structure of the fuel supply apparatus which concerns on this invention is demonstrated using FIG. 3 below. FIG. 3 is a diagram showing the control device 8 and the spring member 11 of FIGS. 1 and 2. According to FIG. 3, the control device 8 incorporates a pressure maintenance device 12 formed as a pressure maintenance valve. The pressure maintaining device 12 is received in the cavity 13 of the control device 8 together with the spring member 14.

制御装置８が、バイパス燃料導管９を経由して制御装置８に供給されるバイパス燃料によって生じる圧力によって、図２に示した位置に移動され、導管７を開放する場合、制御室６に収集された制御燃料は制御装置８の空洞１３に流入し、圧力維持装置１２に圧力を累加する。当該圧力によって、圧力維持装置１２はばね部材１４による弾性に抗して移動可能であり、最終的に制御室６は、制御燃料を排出するために燃料供給装置の低圧領域と接続される。   When the control device 8 is moved to the position shown in FIG. 2 by the pressure generated by the bypass fuel supplied to the control device 8 via the bypass fuel conduit 9, when the conduit 7 is opened, it is collected in the control chamber 6. The control fuel flows into the cavity 13 of the control device 8 and accumulates pressure in the pressure maintaining device 12. With this pressure, the pressure maintaining device 12 can move against the elasticity of the spring member 14, and finally the control chamber 6 is connected to the low pressure region of the fuel supply device in order to discharge the control fuel.

圧力維持弁として形成されている圧力維持装置１２は、２つのステップを踏んで開放される。第一のステップでは、圧力維持装置１２は制御装置８によって決定される適切な密閉箇所から持ち上げられる。このとき、圧力維持装置１２と制御装置８との間隙の最小の漏口は開放される。当該間隙の漏口は、制御時のリークを制御室６から排出させるのには十分ではない。   The pressure maintenance device 12 formed as a pressure maintenance valve is opened in two steps. In the first step, the pressure maintenance device 12 is lifted from a suitable sealing location determined by the control device 8. At this time, the smallest leak hole in the gap between the pressure maintaining device 12 and the control device 8 is opened. The clearance gap is not sufficient to discharge the leakage during control from the control chamber 6.

それゆえ、圧力維持装置１２はさらに、制御装置８における凹部１５が開放されるまで開放される。それから、圧力を制御するために、圧力維持装置１２は制御室６の圧力が低下し、圧力維持装置１２が再び完全に閉止するまで往復運動を行う。圧力維持装置１２が当該往復運動を行っている間、圧力維持装置１２には何ら機械的な振止めは生じない。むしろ、圧力維持装置１２は両側からの油圧によって安定している。   Therefore, the pressure maintaining device 12 is further opened until the recess 15 in the control device 8 is opened. Then, in order to control the pressure, the pressure maintaining device 12 reciprocates until the pressure in the control chamber 6 decreases and the pressure maintaining device 12 is completely closed again. While the pressure maintaining device 12 performs the reciprocating motion, the mechanical maintaining of the pressure maintaining device 12 does not occur. Rather, the pressure maintenance device 12 is stabilized by hydraulic pressure from both sides.

圧力維持装置１２の開放に必要な圧力は制御装置８の開放に必要な圧力よりも小さいことが指摘される。   It is pointed out that the pressure required for opening the pressure maintaining device 12 is smaller than the pressure required for opening the control device 8.

本発明に係る燃料供給装置には、多数の利点がある。例えば、本発明に係る燃料供給装置には圧力維持機能が備わっており、当該圧力維持機能は、制御室６の領域および燃料供給装置の低圧領域における圧力の揺れを減少させることを特徴としている。さらに、制御時のリークもしくは制御燃料を減少させることが可能である。インジェクタの領域では、噴射開始時および噴射終了時に、より高い圧力勾配が実現しうる。負荷が低くても、蓄圧システムが蓄えたシステムの圧力はインジェクタで実現可能であり、それによってシステムの圧力は低められるか、あるいは噴射される燃料を最適に処理するために高められることができる。さらに、制御装置および圧力維持装置が安定して移動できるため、摩耗の低減を実現することができる。圧力維持装置を制御装置に組み込むと、構造をコンパクトにすることが可能である。   The fuel supply apparatus according to the present invention has a number of advantages. For example, the fuel supply device according to the present invention has a pressure maintaining function, and the pressure maintaining function is characterized by reducing fluctuations in pressure in the region of the control chamber 6 and the low pressure region of the fuel supply device. Furthermore, it is possible to reduce leakage or control fuel during control. In the injector region, a higher pressure gradient can be achieved at the start and end of injection. Even at low loads, the system pressure stored by the accumulator system can be realized with an injector, whereby the system pressure can be lowered or increased to optimally handle the injected fuel. Furthermore, since the control device and the pressure maintaining device can move stably, it is possible to reduce wear. When the pressure maintaining device is incorporated in the control device, the structure can be made compact.

１ インジェクタ
２ 蓄圧システム
３ 高圧燃料導管
４ 切換装置
５ 高圧燃料導管
６ 制御室
７ 導管
８ 制御装置
９ バイパス燃料導管
１０ 絞り弁
１１ ばね部材
１２ 圧力維持装置
１３ 空洞
１４ ばね部材
１５ 凹部 DESCRIPTION OF SYMBOLS 1 Injector 2 Accumulation system 3 High pressure fuel conduit 4 Switching device 5 High pressure fuel conduit 6 Control chamber 7 Conduit 8 Control device 9 Bypass fuel conduit 10 Throttle valve 11 Spring member 12 Pressure maintenance device 13 Cavity 14 Spring member 15 Concave

Claims (8)

低圧領域と、少なくとも１つの高圧ポンプを含むポンプ装置とを備えた、エンジンの燃料供給装置、すなわちコモンレール式燃料供給装置であって、燃料は前記燃料供給装置の低圧領域から当該燃料供給装置の高圧領域へ運搬され、前記ポンプ装置と気筒との間に配設されたインジェクタの領域には、少なくとも１つの蓄圧ユニットを有する、持続的に高圧下に置かれた蓄圧システムが備えられており、当該蓄圧システムは少なくとも１つのやはり持続的に高圧下に置かれた高圧燃料導管を介して前記ポンプ装置と接続されており、当該蓄圧システムは噴射のタイミングに応じて間欠的に高圧下に置かれる高圧燃料導管を介して前記インジェクタと接続されており、当該インジェクタを前記蓄圧システムと接続する、前記噴射のタイミングに応じて間欠的に高圧下に置かれる高圧燃料導管には、噴射のタイミングに応じて前記インジェクタに燃料を供給する切換装置が配設されている燃料供給装置において、
制御装置（８）は各インジェクタ（１）と協働し、それによって各インジェクタ（１）に配設された切換装置（４）の開放時に各インジェクタ（１）に接続される高圧燃料導管（３）の脇を通過する制御燃料は、制御装置（８）によって開閉可能な制御室（６）に導入可能であり、バイパス燃料は各インジェクタ（１）に接続される高圧燃料導管（３）から分岐したバイパス導管（９）を経由して、遅れて制御装置（８）に供給可能であり、それによって各インジェクタ（１）の開放後、バイパス導管（９）を経由して排出されるバイパス燃料は制御装置（８）を移動させ、当該移動によって前記制御燃料は制御室（６）から排出可能となり、前記燃料供給装置の前記低圧領域に供給可能となっていることを特徴とする燃料供給装置。 A fuel supply device for an engine, that is, a common rail fuel supply device having a low pressure region and a pump device including at least one high pressure pump, wherein fuel is supplied from the low pressure region of the fuel supply device to the high pressure of the fuel supply device. In the region of the injector transported to the region and arranged between the pump device and the cylinder, it is equipped with an accumulator system that is continuously placed under high pressure, having at least one accumulator unit, The accumulator system is connected to the pump device via at least one high-pressure fuel conduit that is also continuously under high pressure, and the accumulator system is intermittently placed under high pressure according to the timing of injection. Connected to the injector through a fuel conduit, and connects the injector to the pressure accumulating system at the timing of the injection. Flip the high-pressure fuel conduit is intermittently placed under high pressure, in the fuel supply system for the switching device is arranged to supply fuel to the injector in accordance with the timing of the injection,
The control device (8) cooperates with each injector (1), whereby a high-pressure fuel conduit (3) connected to each injector (1) when the switching device (4) arranged in each injector (1) is opened. ) Can be introduced into the control chamber (6) that can be opened and closed by the control device (8), and the bypass fuel is branched from the high-pressure fuel conduit (3) connected to each injector (1). Can be supplied to the control device (8) via the bypass conduit (9) with a delay, whereby the bypass fuel discharged via the bypass conduit (9) after the opening of each injector (1) is The fuel supply device characterized in that the control device (8) is moved, and the control fuel can be discharged from the control chamber (6) by the movement, and can be supplied to the low pressure region of the fuel supply device. バイパス導管（９）に絞り弁（１０）が組み込まれていることを特徴とする請求項１に記載の燃料供給装置。   2. The fuel supply device according to claim 1, wherein a throttle valve (10) is incorporated in the bypass conduit (9). 前記バイパス燃料によって制御装置（８）に累加された圧力が制御装置（８）をばね部材（１１）によって提供される弾性に抗して移動させることによって、制御室（６）が前記制御燃料を排出するために前記燃料供給装置の前記低圧領域と接続されるようになっていることを特徴とする請求項１または２に記載の燃料供給装置。   The pressure accumulated in the control device (8) by the bypass fuel moves the control device (8) against the elasticity provided by the spring member (11), so that the control chamber (6) causes the control fuel to move. The fuel supply apparatus according to claim 1 or 2, wherein the fuel supply apparatus is connected to the low pressure region of the fuel supply apparatus for discharging. 制御装置（８）の開放に必要な圧力が、各インジェクタ（１）の開放に必要な圧力よりも低いことを特徴とする請求項１から３のいずれか一項に記載の燃料供給装置。   4. The fuel supply device according to claim 1, wherein the pressure required for opening the control device is lower than the pressure required for opening each injector. 5. 制御装置（８）は制御弁であることを特徴とする請求項１から４のいずれか一項に記載の燃料供給装置。   The fuel supply device according to claim 1, wherein the control device is a control valve. 制御装置（８）には圧力維持装置（１２）が組み込まれており、制御装置（８）が前記バイパス燃料によって生じた圧力によって移動されたときに、前記圧力維持装置（１２）は前記制御燃料によって生じた圧力によって、ばね部材（１４）によって提供される弾性に抗して移動可能であり、それによって制御室（６）が前記制御燃料を排出するために前記燃料供給装置の前記低圧領域と接続されるようになっていることを特徴とする請求項１から５のいずれか一項に記載の燃料供給装置。   The control device (8) incorporates a pressure maintaining device (12), and when the control device (8) is moved by the pressure generated by the bypass fuel, the pressure maintaining device (12) By the pressure produced by the spring member (14), so that the control chamber (6) can be moved against the low pressure region of the fuel supply device for discharging the control fuel. The fuel supply device according to any one of claims 1 to 5, wherein the fuel supply device is connected. 圧力維持装置（１２）の開放に必要な圧力が、制御装置（８）の開放に必要な圧力よりも低いことを特徴とする請求項６に記載の燃料供給装置。   7. The fuel supply device according to claim 6, wherein the pressure required for opening the pressure maintaining device (12) is lower than the pressure required for opening the control device (8). 圧力維持装置（１２）は圧力維持弁であることを特徴とする請求項６または７に記載の燃料供給装置。   The fuel supply device according to claim 6 or 7, wherein the pressure maintaining device (12) is a pressure maintaining valve.
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FI20095215A7 (en) 2009-09-14
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CN101532454A (en) 2009-09-16
FI20095215A0 (en) 2009-03-04

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