DE19900564A1 - Common rail system for injection IC engine has the high pressure fuel pump lubricated by fuel tapped off the low pressure feed and returned into the fuel tank - Google Patents

Common rail system for injection IC engine has the high pressure fuel pump lubricated by fuel tapped off the low pressure feed and returned into the fuel tank

Info

Publication number
DE19900564A1
DE19900564A1 DE1999100564 DE19900564A DE19900564A1 DE 19900564 A1 DE19900564 A1 DE 19900564A1 DE 1999100564 DE1999100564 DE 1999100564 DE 19900564 A DE19900564 A DE 19900564A DE 19900564 A1 DE19900564 A1 DE 19900564A1
Authority
DE
Germany
Prior art keywords
fuel
pressure
common rail
rail system
high pressure
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
DE1999100564
Other languages
German (de)
Other versions
DE19900564C2 (en
Inventor
Erhard Faix
Gerd Loesch
Rainer Schnatterer
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
Priority to DE1999100564 priority Critical patent/DE19900564C2/en
Priority to JP2000000880A priority patent/JP4650964B2/en
Priority to FR0000168A priority patent/FR2788310B1/en
Publication of DE19900564A1 publication Critical patent/DE19900564A1/en
Application granted granted Critical
Publication of DE19900564C2 publication Critical patent/DE19900564C2/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/007—Installations or systems with two or more pumps or pump cylinders, wherein the flow-path through the stages can be changed, e.g. from series to parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/18—Lubricating

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

A common rail fuel feed system for an IC engine has fuel pumped from the fuel tank (1) by a low pressure pump (3). The low pressure feed delivers fuel to the high pressure pump (6) via a non return valve (11) which opens at a preset pressure. Some of the low pressure fuel is returned to the fuel tank via a control valve (8). The return flow fuel also lubricates the high pressure fuel pump. No separate return line is required for fuel leaks.

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein Common-Rail-System mit einer Vorförderpumpe, die aus einem Kraftstofftank einen Kraftstoffstrom zu einer Hochdruckpumpe fördert, der mit Hilfe einer Ventileinrichtung in einen Schmierstrom und einen Hochdruckförderstrom aufgeteilt wird, der mit Hochdruck beaufschlagt in einen Hochdruckspeicher gefördert wird.The invention relates to a common rail system with a Pre-feed pump, which consists of a fuel tank Fuel flow to a high pressure pump that supports Using a valve device in a lubrication stream and a high-pressure flow is divided with High pressure applied to a high pressure accumulator becomes.

Ein derartiges Common-Rail-System ist in der nicht vorveröffentlichten DE 197 39 653 beschrieben. Bei dem bekannten Common-Rail-System wird zur Abzweigung des Schmierstroms ein Stromregelventil verwendet. Im Rahmen der vorliegenden Erfindung hat sich herausgestellt, dass eine gewisse Leckage nicht ganz vermieden werden kann. Deshalb muss bei Common-Rail-Systemen mit einem Stromregelventil zur Abzweigung des Schmierstroms eine gesonderte Leckagerückführung vorgesehen werden. Diese Leckagerückführung kann bspw. mit einer Drossel verwirklicht werden. Die zusätzliche Leckagerückführung ist aufwendig und verteuert die Herstellung des Common-Rail- Systems.Such a common rail system is not in the previously published DE 197 39 653. In which known common rail system is used to branch off the Lubrication flow uses a flow control valve. As part of the The present invention has been found that a certain leakage cannot be completely avoided. Therefore for common rail systems with a flow control valve a separate one to divert the lubricating flow Leakage feedback can be provided. This Leakage feedback can, for example, with a throttle be realized. The additional leakage feedback is complex and expensive to manufacture the common rail Systems.

Aufgabe der Erfindung ist es, ein Common-Rail-System der eingangs geschilderten Art bereitzustellen, bei dem auf eine aufwendige Leckagerückführung verzichtet werden kann.The object of the invention is to provide a common rail system to provide the type described in the  elaborate leakage recirculation can be dispensed with.

Die Aufgabe ist bei einem Common-Rail-System mit einer Vorförderpumpe, die aus einem Kraftstofftank einen Kraftstoffstrom zu einer Hochdruckpumpe fördert, der mit Hilfe einer Ventileinrichtung in einen Schmierstrom und einen Hochdruckförderstrom aufgeteilt wird, der mit Hochdruck beaufschlagt in einen Hochdruckspeicher gefördert wird, dadurch gelöst, dass der Schmierstrom über ein Druckregelventil von dem von der Vorförderpumpe geförderten Kraftstoffstrom abgezweigt wird, und dass im Zulauf der Hochdruckpumpe ein Einlassventil mit einem bestimmten Öffnungsdruck vorgesehen ist. Durch das Druckregelventil wird im gesamten Betriebsbereich der Hochdruckpumpe ein ausreichender Schmierstrom gewährleistet. Bei einer eventuellen Leckage im Niederdruckförderkreis fällt der Druck im System so weit ab, dass das Einlassventil schließt und somit die Hochdruckpumpe abgedrosselt wird. Hierdurch wird der Motor abgestellt. Ein zusätzliches Überstromventil zur Rückförderung der Leckage ist nicht erforderlich.The task is with a common rail system with one Pre-feed pump, which consists of a fuel tank Fuel flow to a high pressure pump that supports Using a valve device in a lubrication stream and a high-pressure flow is divided with High pressure applied to a high pressure accumulator is solved in that the lubricating flow over a Pressure control valve from that delivered by the pre-feed pump Fuel flow is branched off, and that in the inflow of High pressure pump an inlet valve with a certain Opening pressure is provided. Through the pressure control valve is used in the entire operating range of the high pressure pump sufficient lubrication flow guaranteed. At a possible leakage in the low pressure delivery circuit System pressure so low that the inlet valve closes and thus the high pressure pump is throttled. Hereby the engine is turned off. An additional overflow valve it is not necessary to return the leakage.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus den Unteransprüchen sowie der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung ein Ausführungsbeispiel der Erfindung im Einzelnen beschrieben ist. Dabei können die in den Ansprüchen und in der Beschreibung erwähnten Merkmale jeweils einzeln für sich oder in beliebiger Kombination erfindungswesentlich sein.Further advantages, features and details of the invention result from the subclaims and the following description, in which with reference to the Drawing an embodiment of the invention in Individual is described. The can in the Claims and features mentioned in the description each individually or in any combination be essential to the invention.

Die Figur zeigt ein hydraulisches Schaltbild eines Common- Rail-Systems gemäß der vorliegenden Erfindung. In einem Tank 1 befindet sich Kraftstoff. Der Kraftstoff wird aus dem Tank 1 über einen Filter 2 angesaugt. Das Ansaugen des Kraftstoffs erfolgt durch eine Vorförderpumpe 3. The figure shows a hydraulic circuit diagram of a common rail system according to the present invention. There is fuel in a tank 1 . The fuel is drawn from the tank 1 through a filter 2 . The fuel is drawn in by a prefeed pump 3 .

Der von der Vorförderpumpe 3 geförderte Kraftstoffstrom 4 dient zur Versorgung einer Hochdruckpumpe 6. Über eine Ventileinrichtung 8 wird von, dem Kraftstoffstrom 4 ein Schmierstrom 9 abgezweigt. Der Schmierstrom 9 dient zur Schmierung des Antriebs der Hochdruckpumpe 6 und wird dann in den Tank 1 zurückgeführt.The fuel flow 4 delivered by the prefeed pump 3 serves to supply a high-pressure pump 6 . A lubricating flow 9 is branched off from the fuel flow 4 via a valve device 8 . The lubricating flow 9 serves to lubricate the drive of the high-pressure pump 6 and is then returned to the tank 1 .

Aus der Differenz zwischen dem Kraftstoffstrom 4 und dem Schmierstrom 9 ergibt sich ein Hochdruckförderstrom 10. Über ein Überströmventil 11 gelangt der Hochdruckförderstrom 10 in den Hochdruckbereich der Hochdruckpumpe 6. Dort wird der Hochdruckförderstrom 10 mit Hochdruck beaufschlagt und gelangt dann, wie durch den Pfeil 12 angedeutet ist, in einen nicht dargestellten Hochdruckspeicher (Rail).A high-pressure delivery flow 10 results from the difference between the fuel flow 4 and the lubrication flow 9 . The high-pressure delivery flow 10 reaches the high-pressure region of the high-pressure pump 6 via an overflow valve 11 . There, the high-pressure delivery stream 10 is subjected to high pressure and then, as indicated by the arrow 12 , reaches a high-pressure accumulator (rail), not shown.

Bei der Ventileinrichtung 8 handelt es sich um ein magnetgesteuertes Proportionalventil. Der Schmierstrom 9 dient ebenfalls zur Kühlung der Hochdruckpumpe 6. Die Ansteuerung des Magnetventils erfolgt über ein Kennfeld, welches die Förderkennlinie der Vorförderpumpe 3 berücksichtigt. Um davon unabhängig zu sein, kann die Mengenzumessung auch über eine Druckregelung im Zulauf der Hochdruckpumpe 6 erfolgen. Das Magnetventil muss dann kennfeldabhängig einen bestimmten Druck einstellen. Dadurch wird die Steuerung erleichtert.The valve device 8 is a solenoid-controlled proportional valve. The lubricating flow 9 also serves to cool the high-pressure pump 6 . The solenoid valve is controlled via a map, which takes into account the delivery characteristic of the prefeed pump 3 . In order to be independent of this, the quantity can also be metered via a pressure control in the inlet of the high-pressure pump 6 . The solenoid valve must then set a certain pressure depending on the map. This makes control easier.

Claims (3)

1. Common-Rail-System mit einer Vorförderpumpe, die aus einem Kraftstofftank (1) einen Kraftstoffstrom (4) zu einer Hochdruckpumpe (6) fördert, der mit Hilfe einer Ventileinrichtung (8) in einen Schmierstrom (9) und einen Hochdruckförderstrom (10) aufgeteilt wird, der mit Hochdruck beaufschlagt in einen Hochdruckspeicher gefördert wird, dadurch gekennzeichnet, dass der Schmierstrom (9) über ein Druckregelventil (8) von dem von der Vorförderpumpe (3) geförderten Kraftstoffstrom (4) abgezweigt wird, und dass im Zulauf der Hochdruckpumpe (6) ein Einlassventil (11) mit einem bestimmten Öffnungsdruck vorgesehen ist.1. Common rail system with a pre-feed pump, which delivers a fuel flow ( 4 ) from a fuel tank ( 1 ) to a high-pressure pump ( 6 ), which with the help of a valve device ( 8 ) into a lubricating flow ( 9 ) and a high-pressure delivery flow ( 10 ), which is supplied with high pressure to a high-pressure accumulator, characterized in that the lubricating stream ( 9 ) is branched off via a pressure control valve ( 8 ) from the fuel flow ( 4 ) delivered by the pre-feed pump ( 3 ), and that the High pressure pump ( 6 ) an inlet valve ( 11 ) is provided with a certain opening pressure. 2. Common-Rail-System nach Anspruch 1, dadurch gekennzeichnet, dass das Druckregelventil (8) ein magnetgesteuertes Proportionalventil ist.2. Common rail system according to claim 1, characterized in that the pressure control valve ( 8 ) is a solenoid-controlled proportional valve. 3. Common-Rail-System nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Ansteuerung des Druckregelventils (8) über ein Kennfeld erfolgt, das die Förderkennlinie der Vorförderpumpe (3) berücksichtigt.3. Common rail system according to one of the preceding claims, characterized in that the control of the pressure control valve ( 8 ) takes place via a map which takes into account the delivery characteristic of the pre-feed pump ( 3 ).
DE1999100564 1999-01-09 1999-01-09 Common Rail System Expired - Fee Related DE19900564C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE1999100564 DE19900564C2 (en) 1999-01-09 1999-01-09 Common Rail System
JP2000000880A JP4650964B2 (en) 1999-01-09 2000-01-06 Common rail system
FR0000168A FR2788310B1 (en) 1999-01-09 2000-01-07 COMMON RAMP INJECTION SYSTEM FOR MOTOR VEHICLES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1999100564 DE19900564C2 (en) 1999-01-09 1999-01-09 Common Rail System

Publications (2)

Publication Number Publication Date
DE19900564A1 true DE19900564A1 (en) 2000-07-20
DE19900564C2 DE19900564C2 (en) 2003-09-18

Family

ID=7893848

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1999100564 Expired - Fee Related DE19900564C2 (en) 1999-01-09 1999-01-09 Common Rail System

Country Status (3)

Country Link
JP (1) JP4650964B2 (en)
DE (1) DE19900564C2 (en)
FR (1) FR2788310B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002097268A1 (en) * 2001-05-26 2002-12-05 Robert Bosch Gmbh High-pressure pump for a fuel system of an internal combustion engine
DE202017107379U1 (en) 2017-12-04 2017-12-18 SKF Lubrication System Germany GmbH Grease pump
DE102017221847A1 (en) 2017-12-04 2019-06-06 Skf Lubrication Systems Germany Gmbh Grease pump and method for utilization of leakage grease of a grease pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013218873A1 (en) * 2013-09-19 2015-03-19 Robert Bosch Gmbh Fluid delivery system for a fluid

Citations (2)

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Publication number Priority date Publication date Assignee Title
DE19739653A1 (en) * 1997-09-10 1999-03-11 Bosch Gmbh Robert Process for producing high-pressure fuel and system for producing high-pressure fuel
DE19742180A1 (en) * 1997-09-24 1999-03-25 Siemens Ag IC engine fuel-injection system

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
DE2703686A1 (en) * 1977-01-29 1978-08-10 Bosch Gmbh Robert Variable volume high pressure hydraulic pump - has separate throttled circuit for cooling and lubricating oil supplied to main pump
DE19549108A1 (en) * 1995-12-29 1997-07-03 Bosch Gmbh Robert High-pressure fuel generation system for a fuel injection system used in internal combustion engines
DE19652831B4 (en) * 1996-12-18 2011-02-24 Continental Automotive Gmbh Pressure fluid feed system for the supply of high pressure manifolds
DE19746563A1 (en) * 1997-10-22 1999-04-29 Bosch Gmbh Robert Fuel injection system for IC engine
DE19810867C2 (en) * 1998-03-13 2000-02-24 Bosch Gmbh Robert Fuel pump arrangement

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19739653A1 (en) * 1997-09-10 1999-03-11 Bosch Gmbh Robert Process for producing high-pressure fuel and system for producing high-pressure fuel
DE19742180A1 (en) * 1997-09-24 1999-03-25 Siemens Ag IC engine fuel-injection system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Bosch Kraftfahrtechnisches Taschenbuch, VDI Verlag, 19. Auflage, S. 625 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002097268A1 (en) * 2001-05-26 2002-12-05 Robert Bosch Gmbh High-pressure pump for a fuel system of an internal combustion engine
US6889665B2 (en) 2001-05-26 2005-05-10 Robert Bosch Gmbh High pressure pump for a fuel system of an internal combustion engine, and a fuel system and internal combustion engine employing the pump
DE202017107379U1 (en) 2017-12-04 2017-12-18 SKF Lubrication System Germany GmbH Grease pump
DE102017221847A1 (en) 2017-12-04 2019-06-06 Skf Lubrication Systems Germany Gmbh Grease pump and method for utilization of leakage grease of a grease pump

Also Published As

Publication number Publication date
DE19900564C2 (en) 2003-09-18
JP2000205078A (en) 2000-07-25
FR2788310B1 (en) 2004-07-16
FR2788310A1 (en) 2000-07-13
JP4650964B2 (en) 2011-03-16

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OP8 Request for examination as to paragraph 44 patent law
8304 Grant after examination procedure
8364 No opposition during term of opposition
R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee