EP0792413A1 - Systeme d'injection de carburant pour moteurs a combustion interne - Google Patents

Systeme d'injection de carburant pour moteurs a combustion interne

Info

Publication number
EP0792413A1
EP0792413A1 EP96914980A EP96914980A EP0792413A1 EP 0792413 A1 EP0792413 A1 EP 0792413A1 EP 96914980 A EP96914980 A EP 96914980A EP 96914980 A EP96914980 A EP 96914980A EP 0792413 A1 EP0792413 A1 EP 0792413A1
Authority
EP
European Patent Office
Prior art keywords
fuel
injection system
fuel injection
pressure
casing
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
Application number
EP96914980A
Other languages
German (de)
English (en)
Other versions
EP0792413B1 (fr
Inventor
Wilhelm Eyberg
Rainer Burkel
Bernhard Bronkal
Norbert Knab
Martin Grosser
Andreas Werner
Bernd Spielmann
Rainer Oettinger
Peter Schubert
Klaus Scherer
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.)
Robert Bosch GmbH
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
Publication of EP0792413A1 publication Critical patent/EP0792413A1/fr
Application granted granted Critical
Publication of EP0792413B1 publication Critical patent/EP0792413B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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
    • 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
    • F02M55/025—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
    • 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

Definitions

  • the invention is based on a fuel injection system for internal combustion engines according to the preamble of claim 1.
  • a fuel injection system is known from DE 43 18 078 AI.
  • High pressure accumulator has significant pressures that are well above
  • Leakages generally have very small cross sections, which then lead to fine-jet, barely visible escapes of fuel when fuel pressure is high in the high-pressure accumulator, in the manner of fuel injection jets that occur with fuel injection nozzles themselves.
  • Such fuel jets have significant kinetic energy, which can be destructive and, in particular, also Can endanger people who operate in the area of such high-pressure fuel stores.
  • the invention has the advantage that the escaping fuel is caught by the casing and can then be drained off, so that the aforementioned damage does not occur.
  • the sheath consists of a net-like sheath according to claim 3, which allows a maximum of flexibility and fatigue strength and still safely prevents the escape of harmful fuel jets.
  • a collecting device for the escaping fuel is particularly advantageously provided, which can advantageously be monitored by a liquid level measuring device according to claim 6. This not only avoids the dangers of fuel escaping from the high-pressure tank, but also prevents fuel from escaping uncontrollably for a long time.
  • the high-pressure container is accommodated in a particularly simple manner within a cylinder head cover which is already to be provided in the internal combustion engine and with which the gas exchange valve drive is closed to the outside, on the one hand to avoid damage and on the other hand to collect lubricating oil which is returned to the oil collection container of the internal combustion engine via an oil return.
  • This also serves to absorb leaked fuel from the high-pressure accumulator.
  • monitoring of the liquid level in the oil collecting container is advantageously provided, in particular also to ensure that the lubricating oil of the internal combustion engine does not produce excessive amounts
  • FIG. 1 shows a schematic illustration of a fuel injection system according to the preamble of the patent claim
  • FIG. 2 shows a first embodiment according to the invention of a casing of the high-pressure accumulator of the fuel injection system
  • FIG. 3 shows a second exemplary embodiment of a casing of the high-pressure accumulator with an essentially closed jacket made of sheet metal
  • FIG. 4 shows a third Embodiment of the invention housed within a cylinder head cover
  • FIG. 1 schematically shows a fuel injection system which has a fuel reservoir 1, from which a high-pressure feed pump 3 sucks fuel via a suction line 2 and delivers it under high pressure into a high-pressure fuel reservoir 6 via a pressure line 4.
  • the fuel pressure in this high-pressure fuel reservoir is monitored by a pressure sensor 7 and the value that it outputs is compared in a control device 9 with a target value.
  • a pressure control device 10 is actuated, for example of the type that, via an adjustable valve, which is arranged in a relief line 11 of the high-pressure fuel reservoir 6, is fed back into the tank via excess fuel.
  • a plurality of fuel injection valves 12 are supplied with fuel from the high-pressure fuel reservoir via pressure lines 14.
  • the injection timing and the injection duration of fuel via these fuel injection valves is controlled electrically, for. B. by solenoid valves, which are controlled by the control unit 9 according to the requirements, for example from speed and load.
  • High-pressure fuel storage display this or act on the fuel injection system in such a way that, for. B. this is shut down or reduced to emergency operation, such a safety device is now provided according to the embodiment of the invention according to FIG.
  • the high-pressure accumulator 6 is again shown schematically. Around this is now in a first version of the
  • this envelope can also consist of a net-like structure produced in another way, e.g. B. slotted metal sheet, as is possible with expanded metal.
  • the net-like casing 15 consists of mechanically resistant material, in particular metal, surrounding the high-pressure fuel accumulator on all sides.
  • the cover can also consist of plastic or glass / carbon fiber material with high stability against escaping fuel.
  • a reduction in the enclosure can also be limited to the areas in which connections between the high-pressure fuel accumulator and other parts of the fuel injection system, in particular of a soluble type. With this covering it is prevented that fuel escaping at leaky points, which emerges at this point due to the high pressure at this point with fine kinetic energy (similar to an injection jet of an injection nozzle), causes damage.
  • a liquid level can form here, which in turn can then be detected by a liquid level measuring device 17 and is supplied to a control device 18, through which a signal device 19 or a control signal for influencing the fuel injection system is output to the control device 9. With such a signal, the fuel injection system can then be influenced in such a way that it may be stopped by switching off the high-pressure feed pump 3 or by the
  • Pressure in the high-pressure accumulator 6 is reduced to a low value via the pressure control device 10, which value may still be high enough to maintain a certain emergency operation. Or the pressure of the high-pressure accumulator is completely lowered and the activity of the Injectors set to zero. Ultimately, it is also conceivable to control only a portion of the fuel injection valves if the fuel supply remains.
  • the high-pressure feed pump 3 can also be switched off by providing an electrically switchable coupling 27 between it and its drive 26, which can be switched by the control device 18, for example.
  • This clutch can be switched not only in the event of a leak described above, but also in the event of other malfunctions in the fuel injection system, for example in the event of incorrect operation of the internal combustion engine, or also in selected operating states which require a reduction in the pressure in the high-pressure accumulator.
  • the shutdown of the high pressure feed pump can be checked using a test cycle.
  • a modification of the invention consists in the embodiment according to FIG. 3, in which the high-pressure fuel reservoir is now surrounded by a closed casing, which has only one outlet 21 for the fuel.
  • a collecting device 16 is provided, as in FIG. 2. This configuration ensures that the surroundings of the high-pressure accumulator are in no way subjected to fuel in the event of leakages.
  • a final embodiment according to FIG. 4 is to accommodate the high-pressure accumulator 6 within the spaces already provided in the internal combustion engine.
  • the high-pressure fuel reservoir 6 is accommodated under the cylinder head cover 23 of the internal combustion engine, which usually closes off the gas exchange valve drive to the outside and protects it from contamination, and ultimately also supplies the oil lubricating the engine via a return line 24 to the oil collection container 25 of the internal combustion engine .
  • This oil return can now also be used to remove the leakage fuel that occurs. So that the oil quality does not drop below the requirements and ultimately the leakage occurring at the high-pressure fuel accumulator can be recognized, the liquid level measuring device 17 is again provided, which works in the same way as that according to FIG. 2.

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

L'invention concerne un système d'injection de carburant pour moteurs à combustion interne, selon lequel il est prévu un réservoir de carburant haute pression (6) servant à alimenter en carburant des soupapes d'injection à commande électrique. Afin de réduire les risques d'endommagement dus aux fuites du réservoir haute pression, ce dernier est entouré d'une enveloppe qui permet de recueillir le carburant de fuite provenant du réservoir.
EP96914980A 1995-09-14 1996-04-24 Systeme d'injection de carburant pour moteurs a combustion interne Expired - Lifetime EP0792413B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19534050A DE19534050A1 (de) 1995-09-14 1995-09-14 Kraftstoffeinspritzsystem für Brennkraftmaschinen
DE19534050 1995-09-14
PCT/EP1996/001700 WO1997010431A1 (fr) 1995-09-14 1996-04-24 Systeme d'injection de carburant pour moteurs a combustion interne

Publications (2)

Publication Number Publication Date
EP0792413A1 true EP0792413A1 (fr) 1997-09-03
EP0792413B1 EP0792413B1 (fr) 2001-11-21

Family

ID=7772136

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96914980A Expired - Lifetime EP0792413B1 (fr) 1995-09-14 1996-04-24 Systeme d'injection de carburant pour moteurs a combustion interne

Country Status (7)

Country Link
US (1) US6079391A (fr)
EP (1) EP0792413B1 (fr)
JP (1) JPH10509229A (fr)
KR (1) KR970707381A (fr)
DE (2) DE19534050A1 (fr)
ES (1) ES2168473T3 (fr)
WO (1) WO1997010431A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19748420A1 (de) * 1997-11-03 1999-05-06 Bosch Gmbh Robert Verfahren zum Betrieb einer selbstzündenden, luftverdichtenden Brennkraftmaschine
DE19750298A1 (de) * 1997-11-13 1999-05-20 Man Nutzfahrzeuge Ag Brennkraftmaschine mit Hochdruckeinspritzsystem
DE19822164A1 (de) * 1998-05-16 1999-11-18 Audi Ag Kraftstoffversorgungssystem für eine Brennkraftmaschine
US6499466B2 (en) * 2000-10-25 2002-12-31 Siemens Vdo Automotive Inc. Double walled fuel rail
DE10245389A1 (de) * 2002-09-28 2004-04-08 Daimlerchrysler Ag Dichtheitsprüfung eines Common-rail-Einspritzsystems
DE102005001758A1 (de) * 2005-01-14 2006-07-20 Daimlerchrysler Ag Unter hydraulischem Druck stehende Einrichtung mit leckagegesteuertem Zulauf
KR100706554B1 (ko) * 2005-12-17 2007-04-13 현대자동차주식회사 하이브리드 전기 자동차의 리크 진단장치 및 방법
DE202015102888U1 (de) * 2015-06-03 2016-09-12 Hörnlein Umformtechnik GmbH Kraftstoffverteilerrohr sowie Kraftfahrzeugbauteil
CN106224227B (zh) * 2016-08-31 2018-10-23 高松标 一种输油泵机械密封泄露报警系统

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DE1426102A1 (de) * 1962-04-25 1968-12-12 Daimler Benz Ag Ausbildung des Zylinderkopfes und der Zylinderkopfhaube von Einspritzbrennkraftmaschinen
DE1808228A1 (de) * 1968-11-11 1970-07-16 Guido Kg Maschf Rohrleitung,insbesondere Einspritzleitung fuer Brennkraftmaschinen
FR2133287A5 (fr) * 1971-04-15 1972-11-24 Semt
SU900045A1 (ru) * 1973-09-11 1982-01-23 Предприятие П/Я В-8735 Устройство дл сбора утечек топлива из форсунки двигател внутреннего сгорани
US4209041A (en) * 1976-07-21 1980-06-24 Loukonen Ernest W Fluid pressure responsive accessory equipment
US4149568A (en) * 1977-12-07 1979-04-17 Caterpillar Tractor Co. Double walled fuel line
US4675221A (en) * 1978-03-08 1987-06-23 Titeflex Corporation Fire sleeve for hose
DE3018781C2 (de) * 1980-05-16 1984-10-11 Felten & Guilleaume Energietechnik GmbH, 5000 Köln Thermisch isoliertes Leitungsrohr
DE3733984A1 (de) * 1987-10-08 1989-06-01 Audi Ag Kraftstoff-einspritzleitungssystem fuer brennkraftmaschinen
US5002030A (en) * 1988-09-29 1991-03-26 Siemens-Bendix Automotive Electronics L.P. Fuel rail assemblies for internal combustion engines
US5129428A (en) * 1989-09-11 1992-07-14 Dayco Products, Inc. Flexible hose constuction
US5179922A (en) * 1990-11-15 1993-01-19 Proprietary Technology, Inc. Apparatus for determining change of fuel flow
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Non-Patent Citations (1)

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Title
See references of WO9710431A1 *

Also Published As

Publication number Publication date
WO1997010431A1 (fr) 1997-03-20
JPH10509229A (ja) 1998-09-08
EP0792413B1 (fr) 2001-11-21
DE19534050A1 (de) 1997-03-20
ES2168473T3 (es) 2002-06-16
DE59608260D1 (de) 2002-01-03
US6079391A (en) 2000-06-27
KR970707381A (ko) 1997-12-01

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