WO2001033070A1 - Systeme d'injection de carburant concu pour des moteurs a combustion interne ayant une pression d'huile de fuite constante dans l'injecteur - Google Patents

Systeme d'injection de carburant concu pour des moteurs a combustion interne ayant une pression d'huile de fuite constante dans l'injecteur Download PDF

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Publication number
WO2001033070A1
WO2001033070A1 PCT/DE2000/003670 DE0003670W WO0133070A1 WO 2001033070 A1 WO2001033070 A1 WO 2001033070A1 DE 0003670 W DE0003670 W DE 0003670W WO 0133070 A1 WO0133070 A1 WO 0133070A1
Authority
WO
WIPO (PCT)
Prior art keywords
injector
injection system
fuel injection
oil pressure
internal combustion
Prior art date
Application number
PCT/DE2000/003670
Other languages
German (de)
English (en)
Inventor
Dieter Kienzler
Wolfgang Stoecklein
Friedrich Boecking
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to EP00983036A priority Critical patent/EP1144850A1/fr
Priority to JP2001535729A priority patent/JP2003514171A/ja
Publication of WO2001033070A1 publication Critical patent/WO2001033070A1/fr

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
    • 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
    • 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
    • F02M55/002—Arrangement of leakage or drain conduits in or from 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors

Definitions

  • the invention is based on a fuel injection system for internal combustion engines with at least one injector, which are connected to an unpressurized fuel return.
  • the control and leakage quantities of the injector or injectors are discharged via an unpressurized fuel return line and fed into the fuel tank.
  • the leak oil in the injector must have a defined pressure.
  • injectors include piezo-controlled common rail injectors.
  • a hydraulic coupler is arranged between the piezo actuator and the control valve, which increases the travel range of the piezo actuator. This is a
  • Coupler space available the filling of which requires a defined leakage oil pressure that is above the ambient pressure.
  • the invention is therefore based on the object of providing a fuel injection system for internal combustion engines in which the leakage oil in the injectors always has a pressure which is above the ambient pressure.
  • This object is achieved according to the invention by a fuel injection system for internal combustion engines with at least one injector, which is or are connected to an unpressurized fuel return, wherein means for maintaining a leakage oil pressure above the ambient pressure are present in the injector or injectors between the injector (s) and the fuel return ,
  • the fuel injection system according to the invention has the advantage that there is always a leakage oil pressure in each injector which is above the ambient pressure. This improves the functioning of the injector or injectors, or makes their function possible. This applies in particular to actuators with a piezo actuator. In addition, the dimensioning of the injection quantities can be improved if the leakage oil pressure in the injector is kept constant.
  • a variant of the invention provides that at each
  • Injector means for maintaining a leakage oil pressure are present, so that the leakage oil pressure in each injector can be kept constant with a high control quality.
  • the arrangement of the means for maintaining a leakage oil pressure directly on the injector prevents that
  • the means for maintaining a leakage oil pressure are integrated in the injector, so that a particularly compact design of the injector is achieved and the number of sealing surfaces and thus the number of possible leakage points is reduced.
  • a collecting line is present between each injector and the means for maintaining a leak oil pressure, so that the
  • Leakage oil pressure of all injectors is controlled centrally. In addition to the cost advantages that result from the fact that the means for maintaining a leakage oil pressure only have to be present, this has the further advantage that the leakage oil pressure is the same in all injectors, so that the injectors of the different cylinders work particularly evenly.
  • connecting line so that the collecting line can be short and of simple geometry and the spatial distance between the collecting line and injectors is bridged by connecting lines which can be produced inexpensively.
  • Another variant of the invention provides that the manifold is arranged in the cylinder head of the internal combustion engine, so that the number of components in the engine compartment is reduced, a particularly compact design of the internal combustion engine and the fuel injection system according to the invention is achieved, and the accessibility of the fuel injection system and the internal combustion engine is improved becomes.
  • Injectors have the same leakage oil pressure above the ambient pressure.
  • FIG. 1 shows a first embodiment of a fuel injection system according to the invention
  • Fig. 2 shows a second embodiment of a fuel injection system according to the invention
  • Fig. 3 shows a third embodiment of a fuel injection system according to the invention.
  • FIG. 1 shows a section of a fuel injection system according to the invention.
  • Two injectors 3 are supplied with fuel from high-pressure fuel store 1 via high-pressure lines 5.
  • the occurring leakage quantities and the control quantities are fed back into a fuel tank 9, which is only indicated, via a fuel return 7. So that the control and leakage quantities in the injector 3 a certain
  • Retain leakage oil pressure 7 pressure control valves 11 are arranged between injectors 3 and each fuel return.
  • the control and leakage quantities are also referred to as leak oil.
  • the pressure control valves 11 block the flow of fuel from the injector 3 into the fuel return 7, as long as the leakage oil pressure in the injector 3 is lower than that Opening pressure of the pressure maintaining valve 11 is.
  • the leakage within the injector 3 leads to the build-up of a leakage oil pressure in the leakage oil area of the injector 3. It is particularly advantageous in the embodiment shown here that each injector 3 has its own pressure-maintaining valve 11, so that the leakage oil pressure in each injector 3 can be kept particularly constant.
  • the fuel return 7 is depressurized, so that no pressure vibrations emanating from it are transmitted to the injectors 3.
  • FIG. 2 shows another exemplary embodiment of a fuel injection system according to the invention.
  • the same components have been given the same reference numbers as in FIG. 1.
  • the essential difference between the exemplary embodiment according to FIG. 1 and the exemplary embodiment according to FIG. 2 is that there is only one centrally arranged pressure-maintaining valve 11.
  • Injectors 3 are manufactured via connecting lines 13 and a collecting line 15. This eliminates the need to provide a pressure control valve 11 on each injector 3. This leads to a cost saving and also to the leakage oil pressure being the same in all injectors 3. This property is particularly advantageous with regard to the best possible combustion and favorable exhaust gas values.
  • the manifold 15 can extend over the entire length of the cylinder bank, so that the connecting lines 13 can be kept short as a result. In other spaces in the engine compartment, the manifold 15 can be shortened to a collector, which only has the task of combining the connecting lines 15, so that a common leakage oil flow Pressure maintaining valve 11 happens.
  • hydraulic factors, in particular possible pressure fluctuations within the connecting lines 13 or the collecting line 15 can also be taken into account when deciding the relationship between the collecting line 15 and connecting lines 13.
  • Fig. 3 shows an embodiment of a fuel injection system according to the invention, in which the manifold 15 in a cylinder head 17 of the
  • this variant is particularly advantageous in that the injectors 3 can be designed with a smooth surface, which simplifies their manufacture and increases reliability.
  • This type of leakage oil discharge via a manifold 15 in the cylinder head can of course also be used in fuel injection systems whose injectors or injectors do not necessarily require a high leakage oil pressure.
  • Fuel injection systems can be dispensed with the pressure holding valve 11 and the manifold 15 can be connected directly to a fuel return 7, not shown. All the features shown in the description, the following claims and the drawing can be essential to the invention both individually and in any combination with one another.

Landscapes

  • 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)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

L'invention concerne un système d'injection de carburant conçu pour des moteurs à combustion interne, caractérisé en ce que l'huile de fuite dans les injecteurs (3) présente toujours une pression supérieure à la pression ambiante.
PCT/DE2000/003670 1999-10-30 2000-10-19 Systeme d'injection de carburant concu pour des moteurs a combustion interne ayant une pression d'huile de fuite constante dans l'injecteur WO2001033070A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP00983036A EP1144850A1 (fr) 1999-10-30 2000-10-19 Systeme d'injection de carburant concu pour des moteurs a combustion interne ayant une pression d'huile de fuite constante dans l'injecteur
JP2001535729A JP2003514171A (ja) 1999-10-30 2000-10-19 内燃機関のためのインジェクター内の一定な逃がしオイル圧力を有する燃料噴射システム

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999152513 DE19952513A1 (de) 1999-10-30 1999-10-30 Kraftstoffeinspritzsystem für Brennkraftmaschinen mit konstantem Lecköldruck im Injektor
DE19952513.7 1999-10-30

Publications (1)

Publication Number Publication Date
WO2001033070A1 true WO2001033070A1 (fr) 2001-05-10

Family

ID=7927542

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2000/003670 WO2001033070A1 (fr) 1999-10-30 2000-10-19 Systeme d'injection de carburant concu pour des moteurs a combustion interne ayant une pression d'huile de fuite constante dans l'injecteur

Country Status (5)

Country Link
EP (1) EP1144850A1 (fr)
JP (1) JP2003514171A (fr)
CN (1) CN1327510A (fr)
DE (1) DE19952513A1 (fr)
WO (1) WO2001033070A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006063909A1 (fr) * 2004-12-16 2006-06-22 Robert Bosch Gmbh Dispositif de détermination de la quantité de carburant de retour d'un injecteur de dispositif d'injection de carburant d'un moteur à combustion interne
GB2440437A (en) * 2006-07-24 2008-01-30 Bosch Gmbh Robert A fuel return line connection device with integrated non-return valve for an internal combustion engine with fuel injection
WO2009024447A1 (fr) * 2007-08-23 2009-02-26 Continental Automotive Gmbh Système d'injection pour un moteur à combustion interne
WO2009147291A2 (fr) * 2008-06-05 2009-12-10 Wärtsilä Finland Oy Système d'injection de carburant pour un moteur à pistons
FR2949512A1 (fr) * 2009-09-02 2011-03-04 Renault Sa Systeme et procede d'injection de carburant a rampe commune pour demarrage a froid
US8899263B2 (en) 2006-07-24 2014-12-02 Robert Bosch Gmbh Return line connector

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10328000A1 (de) * 2003-06-21 2005-01-13 Robert Bosch Gmbh Kraftstoffeinspritzanlage mit verringerten Druckschwingungen im Rücklaufrail
EP1780406B1 (fr) * 2005-10-25 2011-01-05 CRT Common Rail Technologies AG Injecteur pour un système d'injection de carburant et système d'injection de carburant avec tel injecteur
JP2007263052A (ja) * 2006-03-29 2007-10-11 Mitsubishi Fuso Truck & Bus Corp 燃料噴射装置の燃料リターン路構造
DE102006061690A1 (de) 2006-12-28 2008-07-03 Robert Bosch Gmbh Druckhalteventil mit Membranelement
DE102008044743A1 (de) * 2008-08-28 2010-03-04 Continental Automotive Gmbh Einspritzventil und Fluidzuführsystem mit Einspritzventil
CN102493902A (zh) * 2011-12-05 2012-06-13 北京理工大学 一种用于氢内燃机的轨压波动控制装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE826216C (de) * 1948-12-31 1951-12-27 E H Karl Maybach Dr Ing Anordnung fuer die Kraftstoffeinspritzung bei Brennkraftmaschinen, insbesondere in Kraftfahrzeugen
DE1937444A1 (de) * 1969-07-23 1971-02-04 Motoren Turbinen Union Einspritzgeraete
US4077376A (en) * 1974-04-20 1978-03-07 Daimler-Benz Aktiengesellschaft Injection installation for diesel internal combustion engine
US4213434A (en) * 1978-01-18 1980-07-22 Robert Bosch Gmbh Fuel injection system
US4440135A (en) * 1981-04-16 1984-04-03 Diesel Kiki Co., Ltd. Fuel injection system provided with fuel injection valves having controllable valve opening pressure
GB2255373A (en) * 1991-04-26 1992-11-04 Kloeckner Humboldt Deutz Ag Diesel engine fuel injection system.
WO1998020250A1 (fr) * 1996-11-07 1998-05-14 Scania Cv Aktiebolag (Publ) Culasse de cylindre

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19649139B4 (de) * 1995-12-08 2007-05-10 Volkswagen Ag Einspritzvorrichtung für Kraftstoff-Verbrennungsmotoren
DE19814836A1 (de) * 1997-04-11 1998-10-15 Volkswagen Ag Kraftstoffversorgung von Einspritzdüsen einer Brennkraftmaschine
DE19744235A1 (de) * 1997-10-07 1999-04-08 Fev Motorentech Gmbh & Co Kg Einspritzdüse mit piezoelektrischem Aktuator
DE19821768C2 (de) * 1998-05-14 2000-09-07 Siemens Ag Dosiervorrichtung und Dosierverfahren

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE826216C (de) * 1948-12-31 1951-12-27 E H Karl Maybach Dr Ing Anordnung fuer die Kraftstoffeinspritzung bei Brennkraftmaschinen, insbesondere in Kraftfahrzeugen
DE1937444A1 (de) * 1969-07-23 1971-02-04 Motoren Turbinen Union Einspritzgeraete
US4077376A (en) * 1974-04-20 1978-03-07 Daimler-Benz Aktiengesellschaft Injection installation for diesel internal combustion engine
US4213434A (en) * 1978-01-18 1980-07-22 Robert Bosch Gmbh Fuel injection system
US4440135A (en) * 1981-04-16 1984-04-03 Diesel Kiki Co., Ltd. Fuel injection system provided with fuel injection valves having controllable valve opening pressure
GB2255373A (en) * 1991-04-26 1992-11-04 Kloeckner Humboldt Deutz Ag Diesel engine fuel injection system.
WO1998020250A1 (fr) * 1996-11-07 1998-05-14 Scania Cv Aktiebolag (Publ) Culasse de cylindre

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1144850A1 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006063909A1 (fr) * 2004-12-16 2006-06-22 Robert Bosch Gmbh Dispositif de détermination de la quantité de carburant de retour d'un injecteur de dispositif d'injection de carburant d'un moteur à combustion interne
GB2440437A (en) * 2006-07-24 2008-01-30 Bosch Gmbh Robert A fuel return line connection device with integrated non-return valve for an internal combustion engine with fuel injection
US8899263B2 (en) 2006-07-24 2014-12-02 Robert Bosch Gmbh Return line connector
WO2009024447A1 (fr) * 2007-08-23 2009-02-26 Continental Automotive Gmbh Système d'injection pour un moteur à combustion interne
US8312862B2 (en) 2007-08-23 2012-11-20 Continental Automotive Gmbh Injection system for an internal combustion engine
WO2009147291A2 (fr) * 2008-06-05 2009-12-10 Wärtsilä Finland Oy Système d'injection de carburant pour un moteur à pistons
WO2009147291A3 (fr) * 2008-06-05 2010-01-28 Wärtsilä Finland Oy Système d'injection de carburant pour un moteur à pistons
RU2491443C2 (ru) * 2008-06-05 2013-08-27 Вяртсиля Финланд Ой Система впрыска топлива для поршневого двигателя
FR2949512A1 (fr) * 2009-09-02 2011-03-04 Renault Sa Systeme et procede d'injection de carburant a rampe commune pour demarrage a froid

Also Published As

Publication number Publication date
DE19952513A1 (de) 2001-06-07
EP1144850A1 (fr) 2001-10-17
JP2003514171A (ja) 2003-04-15
CN1327510A (zh) 2001-12-19

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