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EP0882885A2 - Fuel injection system for internal combustion engines - Google Patents

Fuel injection system for internal combustion engines Download PDF

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Publication number
EP0882885A2
EP0882885A2 EP98102762A EP98102762A EP0882885A2 EP 0882885 A2 EP0882885 A2 EP 0882885A2 EP 98102762 A EP98102762 A EP 98102762A EP 98102762 A EP98102762 A EP 98102762A EP 0882885 A2 EP0882885 A2 EP 0882885A2
Authority
EP
European Patent Office
Prior art keywords
pressure
fuel
internal combustion
control valve
fuel injection
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Withdrawn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
EP98102762A
Other languages
German (de)
French (fr)
Other versions
EP0882885A3 (en
Inventor
Ulrich Koelle
Detlev Dr. Straub
Peter Schubert
Andreas Kellner
Marcus Lenz
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 EP0882885A2 publication Critical patent/EP0882885A2/en
Publication of EP0882885A3 publication Critical patent/EP0882885A3/en
Withdrawn legal-status Critical Current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
    • 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

Definitions

  • the invention relates to a fuel injection system for Internal combustion engines according to the preamble of claim 1 out.
  • the fuel injection system becomes the high-pressure fuel reservoir powered by a high pressure fuel pump and the pressure in the high-pressure fuel accumulator through a pressure control valve controlled.
  • the fuel injection system according to the invention has the advantage that the inserted filter impairs the function of the pressure control valve is avoided. Especially the filter is advantageously designed so that it before all things hold back the components that function of the pressure control valve could significantly affect. These are in particular parts that are on the passage cross sections of the pressure control valve would be retained. A in contrast dimensioned filter according to claim 2 basically a sufficient flow cross-section for Available, the clear width of the several passage cross sections certainly holds back parts Outflow cross section of the pressure control valve could clog.
  • FIG. 1 is a fuel injection system for internal combustion engines reproduced in a schematic representation.
  • This consists of a high-pressure fuel pump 5, the Fuel from a fuel tank 6 if necessary with the interposition of a fuel pump and sucks a filter.
  • the high pressure fuel pump delivers the high pressure fuel via a Pressure line 7 in a high-pressure fuel reservoir 8.
  • Von this lead pressure lines 15 to electrically controlled Fuel injectors 14 from that of each Injection point of the internal combustion engine not shown are assigned and controlled there depending bring fuel to injection from operating parameters.
  • the fuel injectors are replaced by a Control device 18 according to the time of opening and duration of opening controlled.
  • This control device also serves Monitoring the pressure in the high-pressure fuel reservoir 8, in which they receive pressure signals from a pressure sensor 9 on the high-pressure fuel reservoir receives.
  • a Relief line 12 is provided to the fuel tank returns and in which a pressure control valve 11 is appropriate.
  • This can be done mechanically in a known manner work as a pressure relief valve and in addition the Opening pressure of this pressure control valve still electrically the control device 18 can be controlled.
  • Such one Pressure control valve is e.g. known from EP 0 267 162.
  • This filter can of course in a suitable manner either in the pressure control valve 11 be integrated or in the area of an outlet fitting on High-pressure fuel accumulator 8 may be arranged.
  • a filter executable is such as This filter.
  • This filter can be used as a gap filter or as Mesh filters are executed, the filtering Passage cross section in its clear width like this is small that it is preferably equal to or less than that clear cross-section of the pressure control valve is. Consequently are certain components of the pressure control valve withheld the outflow cross section of the Pressure control valve can clog.
  • the filtering Passage cross section in its clear width like this is small that it is preferably equal to or less than that clear cross-section of the pressure control valve is. Consequently are certain components of the pressure control valve withheld the outflow cross section of the Pressure control valve can clog.
  • the individual Passage cross sections on the filter ensures that a sufficient flow cross-section is available, the on the other hand, the relief effect when open Pressure control valve guaranteed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Filtration Of Liquid (AREA)

Abstract

The fuel injection system for an internal combustion engine has a high-pressure fuel pump (5) through which a high-pressure fuel container (8) is supplied with fuel. Pipelines (15) lead from the container to electrically controlled fuel injection valves (14) on the engine. The valves extract fuel from the container and bring it to the engine for injection. The pressure in the container is controlled by a regulating valve (11) and a filter (17) is located between them. The clear width of the cross-section at the filter is smaller or equal to half the clear width of the outflow cross-section of the regulating valve.

Description

Stand der TechnikState of the art

Die Erfindung geht von einem Kraftstoffeinspritzsystem für Brennkraftmaschinen nach der Gattung des Patentanspruchs 1 aus. Bei einem solchen, durch die EP 0 299 337 bekannten Kraftstoffeinspritzsystem wird der Kraftstoffhochdruckspeicher durch eine Kraftstoffhochdruckpumpe versorgt und durch ein Druckregelventil der Druck im Kraftstoffhochdruckspeicher gesteuert. Bei solchen Kraftstoffeinspritzsystemen besteht die Gefahr, daß trotz einer Filterung der der Kraftstoffhochdruckpumpe zugeführten Kraftstoffmenge von einer Montage des Kraftstoffeinspritzsystems herrührende Späne oder Verunreinigungen im Hochdrucksystem angesammelt sind, die die Funktionsfähigkeit des Druckregelventils beeinträchtigen könnten.The invention relates to a fuel injection system for Internal combustion engines according to the preamble of claim 1 out. In such a case, known from EP 0 299 337 The fuel injection system becomes the high-pressure fuel reservoir powered by a high pressure fuel pump and the pressure in the high-pressure fuel accumulator through a pressure control valve controlled. With such fuel injection systems there is a risk that despite filtering the amount of fuel supplied to the high pressure fuel pump assembly of the fuel injection system Chips or contaminants accumulated in the high pressure system are the functionality of the pressure control valve could affect.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Kraftstoffeinspritzsystem nach der Gattung des Anspruchs 1 hat dem gegenüber den Vorteil, daß durch das eingefügte Filter eine Beeinträchtigung der Funktion des Druckregelventils vermieden wird. In besonders vorteilhafter Weise ist das Filter so ausgelegt, daß es vor allen Dingen die Bestandteile zurückhält, die die Funktion des Druckregelventils wesentlich beeinträchtigen könnten. Dies sind insbesondere Teile, die an den Durchtrittsquerschnitten des Druckregelventils zurückgehalten würden. Ein gemäß Anspruch 2 dimensioniertes Filter dagegen stellt grundsätzlich einen ausreichenden Durchflußquerschnitt zur Verfügung, wobei die lichte Weite der mehreren Durchtrittsquerscbnitte mit Sicherheit Teile zurück hält die den Ausflußquerschnitt des Druckregelventils zusetzen könnten.The fuel injection system according to the invention The genus of claim 1 has the advantage that the inserted filter impairs the function of the pressure control valve is avoided. Especially the filter is advantageously designed so that it before all things hold back the components that function of the pressure control valve could significantly affect. These are in particular parts that are on the passage cross sections of the pressure control valve would be retained. A in contrast dimensioned filter according to claim 2 basically a sufficient flow cross-section for Available, the clear width of the several passage cross sections certainly holds back parts Outflow cross section of the pressure control valve could clog.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird in der nachfolgenden Beschreibung näher erläutert.An embodiment of the invention is in the drawing shown and is described in more detail in the following description explained.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In der Figur ist ein Kraftstoffeinspritzsystem für Brennkraftmaschinen in schematischer Darstellung wiedergegeben. Dieses besteht aus einer Kraftstoffhochdruckpumpe 5, die Kraftstoff aus einem Kraftstoffvorratsbehälter 6 gegebenenfalls unter Zwischenschaltung einer Kraftstoffvörforderpumpe und eines Filters ansaugt. Die Kraftstoffhochdruckpumpe fördert den auf Hochdruck gebrachten Kraftstoff über eine Druckleitung 7 in einen Kraftstoffhochdruckspeicher 8. Von diesem führen Druckleitungen 15 zu elektrisch gesteuerten Kraftstoffeinspritzventilen 14 ab, die der jeweiligen Einspritzstelle der nicht weiter gezeigten Brennkraftmaschine zugeordnet sind und dort gesteuert in Abhängigkeit von Betriebsparametern Kraftstoff zur Einspritzung bringen. Dabei werden die Kraftstoffeinspritzventile durch eine Steuereinrichtung 18 nach Öffnungszeitpunkt und Öffnungsdauer gesteuert. Diese Steuereinrichtung dient auch zur Überwachung des Drucks im Kraftstoffhochdruckspeicher 8, in dem sie Drucksignale von einem Drucksensor 9 am Kraftstoffhochdruckspeicher empfängt. Zu Regelung bzw. Steuerung des Druckes im Kraftstoffhochdruckspeicher ist ferner eine Entlastungsleitung 12 vorgesehen, die zum Kraftstoffvorratsbehälter zurückführt und in der ein Druckregelventil 11 angebracht ist. Dieses kann in bekannter Weise mechanisch als Druckbegrenzungsventil arbeiten und zusätzlich kann der Öffnungsdruck dieses Druckregelventils noch elektrisch durch die Steuereinrichtung 18 gesteuert werden. Ein solches Druckregelventil ist z.B. durch die EP 0 267 162 bekannt. Zusätzlich ist nun erfindungsgemäß zwischen dem Druckregelventil 11 und dem Kraftstoffhochdruckspeicher ein Filter 17 eingesetzt, der im vorliegenden Falle nur schematisch wiedergegeben ist. Dieser Filter kann natürlich in geeigneter Weise entweder in das Druckregelventil 11 integriert sein oder im Bereich eines Austrittsfittings am Kraftstoffhochdruckspeicher 8 angeordnet sein. Auch als in der Leitung liegendes Filter ist ein solches Filter ausführbar. Dieses Filter kann als Spaltfilter oder als Maschenfilter ausgeführt werden, wobei der filternde Durchtrittsquerschnitt in seiner lichten Weite jeweils so gering ist, daß er vorzugsweise gleich oder kleiner als der lichte Ausflußquerschnitt des Druckregelventils ist. Somit werden mit Sicherheit Bestandteile vom Druckregelventil zurückgehalten, die den Ausflußquerschnitt des Druckregelventils verstopfen können. Andererseits ist bei einer solchen lichten Weite der einzelnen Durchtrittsquerschnitte am Filter gewährleistet, daß ein ausreichender Durchflußquerschnitt vorhanden ist, der andererseits die entlastende Wirkung bei geöffneten Druckregelventil gewährleistet.In the figure is a fuel injection system for internal combustion engines reproduced in a schematic representation. This consists of a high-pressure fuel pump 5, the Fuel from a fuel tank 6 if necessary with the interposition of a fuel pump and sucks a filter. The high pressure fuel pump delivers the high pressure fuel via a Pressure line 7 in a high-pressure fuel reservoir 8. Von this lead pressure lines 15 to electrically controlled Fuel injectors 14 from that of each Injection point of the internal combustion engine not shown are assigned and controlled there depending bring fuel to injection from operating parameters. The fuel injectors are replaced by a Control device 18 according to the time of opening and duration of opening controlled. This control device also serves Monitoring the pressure in the high-pressure fuel reservoir 8, in which they receive pressure signals from a pressure sensor 9 on the high-pressure fuel reservoir receives. For regulation or control the pressure in the high-pressure fuel reservoir is also a Relief line 12 is provided to the fuel tank returns and in which a pressure control valve 11 is appropriate. This can be done mechanically in a known manner work as a pressure relief valve and in addition the Opening pressure of this pressure control valve still electrically the control device 18 can be controlled. Such one Pressure control valve is e.g. known from EP 0 267 162. In addition, is now between the Pressure control valve 11 and the high-pressure fuel reservoir Filter 17 used, in the present case only is shown schematically. This filter can of course in a suitable manner either in the pressure control valve 11 be integrated or in the area of an outlet fitting on High-pressure fuel accumulator 8 may be arranged. Also as in the line filter is such a filter executable. This filter can be used as a gap filter or as Mesh filters are executed, the filtering Passage cross section in its clear width like this is small that it is preferably equal to or less than that clear cross-section of the pressure control valve is. Consequently are certain components of the pressure control valve withheld the outflow cross section of the Pressure control valve can clog. On the other hand, at such a wide open space of the individual Passage cross sections on the filter ensures that a sufficient flow cross-section is available, the on the other hand, the relief effect when open Pressure control valve guaranteed.

Claims (2)

Kraftstoffeinspritzsystem für Brennkraftmaschinen mit einer Kraftstoffhochdruckpumpe (5), durch die ein Kraftstoffhochdruckspeicher (8) mit Kraftstoff versorgt wird, von dem Druckleitungen (15) zu elektrisch gesteuerte Kraftstoffeinspritzventilen(14) der Brennkraftmaschine führen, die Kraftstoff aus dem Kraftstoffhochdruckspeicher (8) entnehmen und an der Brennkraftmaschine zur Einspritzung bringen, wobei der Druck im Kraftstoffhochdruckspeicher durch ein Druckregelventil (11) gesteuert wird, dadurch gekennzeichnet, daß zwischen Druckregelventil (11) und Kraftstoffhochdruckspeicher (8) ein Filter (17) angeordnet ist.Fuel injection system for internal combustion engines with a high-pressure fuel pump (5) through which a high-pressure fuel reservoir (8) is fueled by the pressure lines (15) to electrically controlled fuel injection valves (14) the internal combustion engine, the fuel from the high-pressure fuel accumulator (8) remove and on the internal combustion engine for injection bring, the pressure in the high-pressure fuel reservoir is controlled by a pressure control valve (11), thereby characterized in that between the pressure control valve (11) and High-pressure fuel accumulator (8) a filter (17) arranged is. Kraftstoffeinspritzsystem nach Anspruch 1 dadurch gekennzeichnet, daß die lichte Weite der Durchtrittsquerschnitte am Filters (17) jeweils kleiner oder gleich der Hälfte des lichten Weite des Ausflußquerschnitts des Druckregelventils (11) ist.Fuel injection system according to claim 1, characterized in that the clear width of the passage cross-sections on the filter (17) less than or equal to half of the clear width of the outflow cross section of the pressure control valve (11) is.
EP98102762A 1997-06-04 1998-02-18 Fuel injection system for internal combustion engines Withdrawn EP0882885A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1997123329 DE19723329A1 (en) 1997-06-04 1997-06-04 Fuel injection system for internal combustion engines
DE19723329 1997-06-04

Publications (2)

Publication Number Publication Date
EP0882885A2 true EP0882885A2 (en) 1998-12-09
EP0882885A3 EP0882885A3 (en) 2001-10-17

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EP98102762A Withdrawn EP0882885A3 (en) 1997-06-04 1998-02-18 Fuel injection system for internal combustion engines

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JP (1) JPH1150934A (en)
DE (1) DE19723329A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1087131A2 (en) * 1999-09-21 2001-03-28 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Improved solenoid valve for regulating the fuel supply pressure of an internal combustion engine
EP1126162A2 (en) * 2000-02-15 2001-08-22 Robert Bosch Gmbh Improved solenoid valve for regulating the fuel supply pressure of an internal combustion engine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19911068A1 (en) 1999-03-12 2000-09-14 Bayerische Motoren Werke Ag Fuel system for a motor vehicle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0267162A2 (en) 1986-11-07 1988-05-11 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Pressure-regulating solenoid valve, particularly for high-pressure circuits of fuel injection systems for internal combustion engines
EP0299337A2 (en) 1987-07-08 1989-01-18 IVECO FIAT S.p.A. Fuel injection system for an internal combustion engine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2689226B2 (en) * 1994-12-02 1997-12-10 株式会社ゼクセル Fuel pump for high pressure fuel injector

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0267162A2 (en) 1986-11-07 1988-05-11 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Pressure-regulating solenoid valve, particularly for high-pressure circuits of fuel injection systems for internal combustion engines
EP0299337A2 (en) 1987-07-08 1989-01-18 IVECO FIAT S.p.A. Fuel injection system for an internal combustion engine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1087131A2 (en) * 1999-09-21 2001-03-28 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Improved solenoid valve for regulating the fuel supply pressure of an internal combustion engine
EP1087131A3 (en) * 1999-09-21 2001-09-05 Robert Bosch Gmbh Improved solenoid valve for regulating the fuel supply pressure of an internal combustion engine
EP1126162A2 (en) * 2000-02-15 2001-08-22 Robert Bosch Gmbh Improved solenoid valve for regulating the fuel supply pressure of an internal combustion engine
EP1126162A3 (en) * 2000-02-15 2002-12-18 Robert Bosch Gmbh Improved solenoid valve for regulating the fuel supply pressure of an internal combustion engine

Also Published As

Publication number Publication date
DE19723329A1 (en) 1998-12-10
JPH1150934A (en) 1999-02-23
EP0882885A3 (en) 2001-10-17

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