EP0699835A1 - Speicherkraftstoffeinspritzvorrichtung - Google Patents

Speicherkraftstoffeinspritzvorrichtung Download PDF

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Publication number
EP0699835A1
EP0699835A1 EP95112465A EP95112465A EP0699835A1 EP 0699835 A1 EP0699835 A1 EP 0699835A1 EP 95112465 A EP95112465 A EP 95112465A EP 95112465 A EP95112465 A EP 95112465A EP 0699835 A1 EP0699835 A1 EP 0699835A1
Authority
EP
European Patent Office
Prior art keywords
pressure
common rail
fuel injection
injection apparatus
type fuel
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.)
Withdrawn
Application number
EP95112465A
Other languages
English (en)
French (fr)
Inventor
Tohru C/O Zexel Corp. Yokota
Naotake c/o Zexel Corp. Ooi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bosch Corp
Original Assignee
Zexel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zexel Corp filed Critical Zexel Corp
Publication of EP0699835A1 publication Critical patent/EP0699835A1/de
Withdrawn legal-status Critical Current

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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

Definitions

  • the present invention relates to an accumulated pressure type fuel injection apparatus, and more particularly to an accumulated pressure type fuel injection apparatus that enables fuel pressure in a common rail to be promptly controlled.
  • FIG. 2 is a schematic diagram illustrating the arrangement of the electronically-controlled fuel injection apparatus 1, which has a fuel pump 2, a common rail (high-pressure accumulator) 3, a plurality of fuel injection tubes 4 connected to the common rail 3, an injector 5 connected to each of the fuel injection tubes 4, a pressure sensor 6, and a control means 7.
  • control means 7 In response to fuel pressure signals from the pressure sensor 6, engine load signals, engine cylinder identification signals, engine speed (rpm) signals and crank angle signals, together with signals 8 indicating atmospheric pressure, fuel temperature and other such conditions, the control means 7 operates the fuel pump 2 to maintain a constant fuel pressure in the common rail 3, and operates the nozzle 9 of the injector 5 to inject the fuel.
  • operating the nozzle 9 causes large variation in fuel pressure.
  • the common rail 3 is provided in the high-pressure fuel supply passage near the injector 5 to enable fuel pressure variation to be absorbed, utilizing the volume elasticity of the fuel.
  • the electronically-controlled fuel injection apparatus 1 enables fuel injection pressure to be set independently of the engine speed or load. Changing the injection pressure from low to high is readily effected by closing a pump control valve (not shown) in the fuel supply pump 2 to pump the fuel to the common rail 3. With this arrangement high pressure can be attained with just a few such pumping operations.
  • a common rail is used that is divided into parallel rails, each of which is connected to an injector.
  • the common rail connected to the malfunctioning injection valve is closed and fuel continues to be supplied to the other common rails. This ensures continued operation of the engine.
  • this arrangement is not directly concerned with high-low control of the common rail pressure itself.
  • the common rail is provided with a pressure reduction valve, so that in the event of a malfunction that leads to loss of control of the high-pressure pump or injector, pressure in the common rail is reduced by opening the pressure reduction valve to release the pressure.
  • this is merely a pressure reducing arrangement and has many energy inefficiencies.
  • a pressure control system is provided in the form of an auxiliary starting pump or assist pump or the like, the aim of which is rapid reduction of fuel pressure during engine starting and stopping and the like.
  • this arrangement requires the provision of the auxiliary starting pump or assist pump, which increases both the cost and the complexity.
  • a damping chamber is provided between the supply pump and the common rail to reduce pulses produced by the supply pump.
  • this arrangement is not directly concerned with high-low control of the common rail pressure itself.
  • the common rail is arranged as at least a double structure of central and side chambers, to reduce pressure variation in the central chamber.
  • this arrangement is not directly concerned with high-low control of the common rail pressure itself.
  • the accumulated-pressure type fuel injection apparatus of JP-A-6-93936 has a high-pressure first accumulator and a low-pressure second accumulator, with the first accumulator being used for main injection and the second accumulator for pilot injection.
  • this arrangement is not directly concerned with high-low control of the common rail pressure itself.
  • An object of a first aspect of the invention is to provide an accumulated pressure type fuel injection apparatus that enables prompt control of pressure in the common rail, such as to, in an electronically-controlled fuel injection apparatus, rapidly lower the common rail pressure or increase the pressure from low to high.
  • Another object of the invention is to provide an accumulated pressure type fuel injection apparatus in which load on the fuel supply pump and loss accompanying high-to-low common rail pressure transition can be avoided whenever possible.
  • a further object of the invention is to provide an accumulated pressure type fuel injection apparatus that controls the common rail pressure using a structurally straightforward and cost-effective arrangement.
  • the present invention provides an accumulated pressure type fuel injection apparatus having a fuel supply pump, a common rail that accepts fuel from the fuel supply pump in a high-pressure state and an injector connected to the common rail, said accumulated pressure type fuel injection apparatus being characterized in that the common rail is divided into at least a pressure maintenance common rail and a pressure control common rail, a means is provided for switching communication states between the pressure maintenance common rail and the pressure control common rail, and the injector is connected to the pressure control common rail.
  • the volume of the above pressure maintenance common rail can be increased while at the same time decreasing the volume of the above pressure control common rail.
  • the pressure control common rail can be provided with a pressure reduction valve. Control of the pressure in the pressure control common rail can be enabled by equipping the pressure control common rail with a pressure sensor.
  • the accumulated pressure type fuel injection apparatus is provided with two common rails, one for maintaining pressure and one for controlling pressure, by dividing the common rail into at least one larger part and one smaller part. This facilitates controlling pressure changes from high to low and from low to high. That is, the amount of common rail pressure change ⁇ Pc can be increased by decreasing the size of the common rail dead volume Vc of equation (1) from the total volume of the pressure maintenance common rail and pressure control common rail to the volume of the pressure control common rail.
  • pressure in the common rail can be rapidly decreased by the decrease in pressure in the pressure control common rail that occurs as fuel is injected by the injector, while at the same time the pressure is maintained unchanged in the pressure maintenance common rail.
  • Pressure can be increased from low to high by operating the communication state switching means to open communication between the pressure maintenance common rail and the pressure control common rail.
  • the pressure in the pressure control common rail can be immediately increased by the operation of the fuel supply pump while at the same time the pressure is maintained unchanged in the pressure maintenance common rail.
  • Figure 1 is an explanatory diagram of an accumulated-pressure type fuel injection apparatus 10 according to an embodiment of the present invention.
  • Figure 2 is an explanatory diagram of a conventional electronically-controlled fuel injection apparatus 1.
  • Figure 3 is a graph showing changes in common rail pressure with the passage of time.
  • the accumulated-pressure type fuel injection apparatus 10 shown in Figure 1 has a pressure maintenance common rail 11 and a pressure control common rail 12, a pipe 13 that connects the pressure maintenance common rail 11 with the pressure control common rail 12, and a means of opening and closing communication between common rails 11 and 12, constituted by a solenoid valve 14 in the connecting pipe 13.
  • the pressure maintenance common rail 11, pressure control common rail 12 and injector 5 are arranged in series.
  • the sum of the dead volumes of the pressure maintenance common rail 11 and pressure control common rail 12 can be made the same as the dead volume of the common rail 3.
  • the pressure sensor 6 is provided on the pressure control common rail 12.
  • the dead volume of the common rail 3 can be instantly reduced by separating the pressure control common rail 12 from the pressure maintenance common rail 11 by closing the solenoid valve 14, whereby the fuel injection by the injector 5 is accompanied by a prompt drop in injection pressure. This is indicated by the broken line in Figure 3.
  • a desired pressure can be maintained by appropriately opening and closing of the solenoid valve 14.
  • the pressure in the pressure maintenance common rail 11 can be promptly transferred to the pressure control common rail 12 by opening the solenoid valve 14, the time taken for the pressure to be increased by the operation of the fuel supply pump 2 can be reduced.
  • the pressure control common rail 12 pressure reduction effect produced by the injection of fuel by the injector 5 when the solenoid valve 14 is closed can be enhanced by providing the pressure control common rail 12 with a pressure reduction valve 15.
  • the ratio between the dead volumes of the pressure maintenance common rail 11 and pressure control common rail 12 may be set as desired, in accordance with the delivery capability of the fuel supply pump 2, injection amount of the injector 5 and other such factors. However, decrease/increase of pressure in the pressure control common rail 12 can be effected more promptly by using a pressure maintenance common rail 11 that is larger than the pressure control common rail 12.
  • the common rail is divided into a pressure maintenance common rail and a pressure control common rail, providing the dual functions of both controlling and maintaining the pressure in the common rail, which is not possible with the conventional arrangements.
  • the arrangement of this invention allows the pressure in the common rail to be rapidly decreased.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP95112465A 1994-08-29 1995-08-08 Speicherkraftstoffeinspritzvorrichtung Withdrawn EP0699835A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP226044/94 1994-08-29
JP6226044A JPH0868368A (ja) 1994-08-29 1994-08-29 蓄圧式燃料噴射装置

Publications (1)

Publication Number Publication Date
EP0699835A1 true EP0699835A1 (de) 1996-03-06

Family

ID=16838912

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95112465A Withdrawn EP0699835A1 (de) 1994-08-29 1995-08-08 Speicherkraftstoffeinspritzvorrichtung

Country Status (2)

Country Link
EP (1) EP0699835A1 (de)
JP (1) JPH0868368A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0735268A2 (de) * 1995-03-28 1996-10-02 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Vorrichtung zur Steuerung der Druckfluidzufuhr zu einem Druckfluidspeicher, zum Beispiel für Kraftfahrzeuge
EP0887544A1 (de) 1997-06-27 1998-12-30 Robert Bosch Gmbh Kraftstoffeinspritzsystem für Brennkraftmaschinen
EP1130251A1 (de) * 2000-03-01 2001-09-05 Wärtsilä NSD Schweiz AG Pumpvorrichtung für ein Common Rail System
EP1143140A1 (de) * 2000-03-01 2001-10-10 Wärtsilä Schweiz AG Versorgungsvorrichtung für ein Common Rail System
US7040290B2 (en) 2003-10-27 2006-05-09 Hyundai Motor Company Common rail system
WO2006107892A1 (en) * 2005-04-01 2006-10-12 Achates Power, Inc. Common rail fuel injection system with accumulator injectors
FR2955155A1 (fr) * 2010-01-13 2011-07-15 Peugeot Citroen Automobiles Sa Dispositif d'injection pour moteur a combustion interne
CN102444514A (zh) * 2010-10-06 2012-05-09 罗伯特·博世有限公司 可变的高压储存器
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
WO2015036243A1 (en) * 2013-09-16 2015-03-19 Delphi International Operations Luxembourg S.À R.L. Hybrid fuel injection equipment
CN114673601A (zh) * 2022-03-18 2022-06-28 东风商用车有限公司 柴油机启动的快速建压方法、装置、设备及可读存储介质

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007303314A (ja) * 2006-05-09 2007-11-22 Yanmar Co Ltd コモンレール式燃料噴射装置
KR101063688B1 (ko) 2008-12-03 2011-09-07 현대자동차주식회사 엔진의 연료 공급장치 및 이를 위한 인젝터
DE102009028238A1 (de) * 2009-08-05 2011-02-17 Robert Bosch Gmbh Volumenreduzierter Hochdruckspeicher
JP4857372B2 (ja) * 2009-08-31 2012-01-18 日立オートモティブシステムズ株式会社 燃料圧力制御装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3226277A1 (de) * 1981-07-17 1983-03-10 Diesel Kiki Co. Ltd., Tokyo Kraftstoffeinspritzsystem fuer eine mehrzylinder-brennkraftmaschine, vorzugsweise fuer hohe einspritzdruecke
JPS6390658A (ja) * 1986-10-03 1988-04-21 Toyota Motor Corp 内燃機関用燃料噴射装置
JPH02112643A (ja) 1988-10-21 1990-04-25 Nippon Denso Co Ltd 燃料噴射装置
JPH04234562A (ja) 1991-01-08 1992-08-24 Nippondenso Co Ltd 蓄圧式燃料噴射装置
JPH05149209A (ja) 1991-11-27 1993-06-15 Nippondenso Co Ltd 燃料噴射装置
JPH05321787A (ja) 1992-05-26 1993-12-07 Nippon Soken Inc 燃料噴射装置
JPH0658219A (ja) 1991-07-09 1994-03-01 M Martin Tibbie 共同レール
JPH0693936A (ja) 1992-09-11 1994-04-05 Mitsubishi Motors Corp 蓄圧式燃料噴射装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3226277A1 (de) * 1981-07-17 1983-03-10 Diesel Kiki Co. Ltd., Tokyo Kraftstoffeinspritzsystem fuer eine mehrzylinder-brennkraftmaschine, vorzugsweise fuer hohe einspritzdruecke
JPS6390658A (ja) * 1986-10-03 1988-04-21 Toyota Motor Corp 内燃機関用燃料噴射装置
JPH02112643A (ja) 1988-10-21 1990-04-25 Nippon Denso Co Ltd 燃料噴射装置
JPH04234562A (ja) 1991-01-08 1992-08-24 Nippondenso Co Ltd 蓄圧式燃料噴射装置
JPH0658219A (ja) 1991-07-09 1994-03-01 M Martin Tibbie 共同レール
JPH05149209A (ja) 1991-11-27 1993-06-15 Nippondenso Co Ltd 燃料噴射装置
JPH05321787A (ja) 1992-05-26 1993-12-07 Nippon Soken Inc 燃料噴射装置
JPH0693936A (ja) 1992-09-11 1994-04-05 Mitsubishi Motors Corp 蓄圧式燃料噴射装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 12, no. 321 (M - 736) 31 August 1988 (1988-08-31) *
SCHNEIDER W: "PUMPEN FUER ZUKUENFTIGE DIESELEINSPRITZSYSTEME", OLHYDRAULIK UND PNEUMATIK, vol. 36, no. 5, 1 May 1992 (1992-05-01), pages 304 - 310, XP000270195 *

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0735268A2 (de) * 1995-03-28 1996-10-02 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Vorrichtung zur Steuerung der Druckfluidzufuhr zu einem Druckfluidspeicher, zum Beispiel für Kraftfahrzeuge
EP0735268A3 (de) * 1995-03-28 1997-12-03 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Vorrichtung zur Steuerung der Druckfluidzufuhr zu einem Druckfluidspeicher, zum Beispiel für Kraftfahrzeuge
EP0887544A1 (de) 1997-06-27 1998-12-30 Robert Bosch Gmbh Kraftstoffeinspritzsystem für Brennkraftmaschinen
EP1130251A1 (de) * 2000-03-01 2001-09-05 Wärtsilä NSD Schweiz AG Pumpvorrichtung für ein Common Rail System
EP1143140A1 (de) * 2000-03-01 2001-10-10 Wärtsilä Schweiz AG Versorgungsvorrichtung für ein Common Rail System
US7040290B2 (en) 2003-10-27 2006-05-09 Hyundai Motor Company Common rail system
WO2006107892A1 (en) * 2005-04-01 2006-10-12 Achates Power, Inc. Common rail fuel injection system with accumulator injectors
US7334570B2 (en) 2005-04-01 2008-02-26 Achates Power, Inc. Common rail fuel injection system with accumulator injectors
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
FR2955155A1 (fr) * 2010-01-13 2011-07-15 Peugeot Citroen Automobiles Sa Dispositif d'injection pour moteur a combustion interne
CN102444514A (zh) * 2010-10-06 2012-05-09 罗伯特·博世有限公司 可变的高压储存器
WO2015036243A1 (en) * 2013-09-16 2015-03-19 Delphi International Operations Luxembourg S.À R.L. Hybrid fuel injection equipment
JP2016534282A (ja) * 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 ハイブリッド燃料噴射装置
US10247127B2 (en) 2013-09-16 2019-04-02 Delphi Technologies Ip Limited Hybrid fuel injection equipment
CN114673601A (zh) * 2022-03-18 2022-06-28 东风商用车有限公司 柴油机启动的快速建压方法、装置、设备及可读存储介质

Also Published As

Publication number Publication date
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