EP2052147A1 - Dispositif et procédé pour réguler un débit volumique de carburant dans un système de circulation à basse pression pour un moteur à combustion interne - Google Patents

Dispositif et procédé pour réguler un débit volumique de carburant dans un système de circulation à basse pression pour un moteur à combustion interne

Info

Publication number
EP2052147A1
EP2052147A1 EP07787121A EP07787121A EP2052147A1 EP 2052147 A1 EP2052147 A1 EP 2052147A1 EP 07787121 A EP07787121 A EP 07787121A EP 07787121 A EP07787121 A EP 07787121A EP 2052147 A1 EP2052147 A1 EP 2052147A1
Authority
EP
European Patent Office
Prior art keywords
fuel
internal combustion
combustion engine
valve
feed pump
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Withdrawn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
EP07787121A
Other languages
German (de)
English (en)
Inventor
Stanislaw Bodzak
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 EP2052147A1 publication Critical patent/EP2052147A1/fr
Withdrawn legal-status Critical Current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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • F02M37/0029—Pressure regulator in the low pressure fuel system

Definitions

  • the present invention relates to an apparatus and a method for controlling a fuel volume flow in a low pressure circuit system for an internal combustion engine according to the preamble of claim 1 and of claim 9.
  • Such low pressure circuit systems for promoting the fuel volume flow from a tank to a common rail injection system of an internal combustion engine are well known from the prior art.
  • Such systems regulate the supply of fuel from a tank to a metering unit or to the high pressure pump, which provides the fuel with a high pressure in the common rail system.
  • High pressure pump is supplied, which is connected to a high-pressure accumulator, and this supplies at least one injection valve with fuel, wherein the fuel has a predetermined pressure, which is adjusted by a high-pressure valve, which communicates with the high pressure accumulator.
  • the high-pressure valve is provided to discharge fuel from a set fuel pressure, this is done as a function of the amount of fuel drained and the fuel flow is controlled by a direct variation of the fuel pressure between the feed pump and the high-pressure pump.
  • an adjustable amount of the fuel supplied by the feed pump is discharged, this being achieved by a direct variation of a cross section of a connecting line between the fuel
  • Feed pump and the high-pressure pump happens.
  • the fundamental problem for conveying the fuel to a metering unit or to a high-pressure pump is that at the start of the internal combustion engine due to the dimensioning of the feed pump no sufficient delivery pressure is available, as this returned by a zero-delivery throttle or the like in the tank becomes.
  • An adapted Promotion of the fuel is possible only during normal operation of the internal combustion engine, so that a high-pressure valve must be provided which opens and closes accordingly when the internal combustion engine is operated in normal operation or is in the starting phase.
  • the invention includes the technical teaching that the fuel return line serially to the zero feed throttle further comprises an overflow valve, which during the
  • Start phase of the internal combustion engine interrupts the return of the fuel in the fuel return line and releases the return of the fuel during operation of the internal combustion engine.
  • the invention is based on the idea that the fuel flow through the fuel return line can be released or interrupted depending on the operating state of the internal combustion engine.
  • the fuel is supplied by the feed pump of a metering unit, and then compressed by a high-pressure pump to a correspondingly high pressure level and fed to the common rail system.
  • the fuel passes through a first delivery line as well a second delivery line, without that there is a throttle in these delivery lines, which would require a larger pumping capacity of the feed pump.
  • the fuel return line is provided which recirculates excess fuel from the second delivery line to the suction side of the delivery pump or into the fuel tank.
  • the performance of the feed pump is low, since the feed pump can only promote a limited fuel flow in dependence on the speed of the internal combustion engine.
  • the metering unit is not 100% tight and a return via the zero delivery throttle is very critical. Only at higher speed, for example, from 800 l / min, the delivery capacity of the feed pump is large enough to supply sufficient fuel even the metering unit or the high-pressure pump, that the spill valve can go into an open position and the fuel through the zero feed throttle through partially Suction side of the pump or can run back into the tank. The return of the
  • Fuel in the tank is necessary when braking by the engine, i. in towing mode, as the speed is high and yet no injection should take place.
  • the resulting advantage is the elimination of a high pressure valve, which is required to control a pressure control valve, whereby the pressure control valve is omitted in its originally complicated design. Furthermore, it is not necessary, a throttle between the feed pump and the
  • Overflow valve is designed as a slide valve and comprises a valve slide on which a control pressure surface is formed, wherein the control pressure surface adjacent to a control pressure chamber. It is further provided that the overflow valve comprises a compression spring which moves the valve spool into a closed position, wherein the valve spool interrupts the fuel return line in the closed position. through This arrangement of the control pressure chamber and the compression spring, the spill valve works as a monostable slide valve, which remains at a non-applied control pressure surface in the closed position and can only be transferred by pressurizing the control pressure chamber and thus the control pressure surface in an operating position.
  • control pressure chamber is in fluid communication with the first delivery line, wherein the valve spool can be brought into an operating position against the spring force of the compression spring when the control pressure chamber is pressurized by the delivery pressure of the delivery pump, and the valve spool in the
  • Control pressure chamber with the first delivery line can be made a reliable circuit of the overflow between a closed position in the starting phase and an operating position in the operating phase of the internal combustion engine.
  • Zero delivery throttle is avoidable because the fuel return line is closed.
  • the feed pump is not necessarily oversized, since it can now be made comparatively small even for a successful start phase of the internal combustion engine.
  • a fuel coarse filter is provided between the tank and the feed pump, and a fuel filter is provided in the first feed line between the feed pump and the metering unit.
  • the branch of the first delivery line for fluid communication with the control pressure chamber of the spill valve is between the fuel fine filter and the
  • control pressure chamber of the overflow valve is operated with already finely filtered fuel.
  • the present invention further relates to a method for controlling a fuel volume flow in a low pressure circuit system for a
  • Fuel return line comprises a zero feed throttle for throttling the recirculated fuel flow.
  • an overflow valve is introduced into the fuel return line in series with the zero feed throttle;
  • a wear position of the overflow valve in the starting phase of the internal combustion engine adjusts, so that the return of the fuel is interrupted via the fuel return line; and a transfer of the spill valve in the transition to the operation of the internal combustion engine in an operating position follows, so that fuel is returned via the fuel return line from the second delivery line to the suction side of the feed pump.
  • the overflow valve comprises a valve spool with a control pressure surface adjacent to a control pressure chamber, and the valve spool is guided via a pressurization of the control pressure surface in the operating position when the pressurization by means of the feed pump.
  • the pressurization by means of the feed pump must reach a minimum pressure level, so that the valve spool of the spill valve when starting the internal combustion engine against the spring force of the compression spring in a
  • the compression spring holds the valve spool in the closed position when the control pressure chamber is not acted upon. This remains even in the closed position when the feed pump with the starting speed of the internal combustion engine promotes only a small volume flow of the fuel.
  • the delivery pressure of the delivery pump reaches a minimum pressure level, so that the valve spool passes into the operating position.
  • the transition to the operating position takes place counter to the spring force of the compression spring and guarantees an operating pressure of about 5 ... 7bar.
  • the feed pump is operated depending on the speed of the internal combustion engine, and at low speed in the starting phase of the internal combustion engine, the spill valve by the low flow rate in the
  • Figure 1 is a view of a low-pressure circuit system for fuel supply to an internal combustion engine with an overflow valve according to the invention in a closed position in the starting phase of
  • FIG. 2 shows a view of a low-pressure circuit system for supplying fuel to an internal combustion engine with an overflow valve according to the invention in an operating position during operation
  • the low-pressure circuit system 1 shown in FIG. 1 is used to transport fuel from a tank 10 to a common-rail system for injecting the fuel into the combustion chamber of an internal combustion engine.
  • a feed pump 11 which sucks the fuel through a fuel coarse filter 22.
  • the fuel is passed after the feed pump 11 through a fuel refill 23 and fed to a first delivery line 12.
  • the delivery line 12 leads to a metering unit, which supplies the fuel via a second delivery line 14 to the common rail system.
  • the fuel can be returned to the suction side of the feed pump 11 or into the tank 10 via a zero feed throttle 16. This is particularly necessary when the internal combustion engine is in normal operation and thus at a correspondingly increased speed.
  • the fuel provided in the second delivery line is greater in quantity than must be supplied by the high-pressure pump to the common rail system.
  • the delivery pump 11 is not operated at full speed, since it is generally driven by the internal combustion engine itself. The case available fuel flow or the
  • Pressure of the fuel in the first delivery line 12 and in the second delivery line 14 is comparatively low.
  • it is provided to first interrupt the outflow of the fuel via the fuel return line 15 through an overflow valve 17 in the second delivery line 14 Even at low speed and low flow rate of the feed pump 11 to provide a high pressure of the fuel available.
  • the overflow valve 17 is in a closed position, in which an axially slidably received valve spool 18 the
  • Fuel return line 15 interrupts.
  • the valve spool 18 is pressed by a compression spring 21 in the closed position.
  • a branch from the first delivery line 12 this is fluidly connected to the control pressure chamber 20.
  • the control pressure chamber 20 adjoins the control pressure surface 19, which opposite of the compression spring 21 by pressurizing the valve spool 18 in a
  • Feed pump 11 can be returned.
  • FIG. 2 shows the low-pressure circuit system 1 in the operating position.
  • the fuel is sucked out of the tank 10 through a first fuel coarse filter 22 by the feed pump 11.
  • the fuel is supplied by the feed pump 11 to a first delivery line 12 through a fuel filter and passes via the first delivery line 12 to a metering unit 13.
  • the metering unit 13 introduces the fuel via a second delivery line 14 to a common rail system - not shown here - too ,
  • valve spool 18 is also transferred via the adjacent control pressure surface 19 against the force of the compression spring 21 in the operating position. Due to corresponding recesses in the valve spool 18 can be returned by this from the zero feed throttle 16 via the fuel return line 15.
  • Overflow valve 17 and the surface of the control pressure surface 19 is tuned to the pressure level of the feed pump 11 such that the valve spool 18 is transferred only at the transition to the normal operation of the internal combustion engine in the operating position. This can also be done by an appropriate selection of the spring stiffness of the compression spring 21 according to the present arrangement. Further, it can be provided that the compression spring 21 can be adjusted via a set screw in a biasing pressure, so that the transition of the valve spool 18 can be adjusted from the closed position to the operating position of the corresponding engine speed.
  • Embodiment Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use.

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

Dispositif pour réguler un débit volumique de carburant dans un système (1) de circulation à basse pression pour un moteur à combustion interne, avec un réservoir (10) pour fournir le carburant, en provenance duquel le carburant peut être apporté par une pompe de refoulement (11) à une pompe à haute pression via une conduite de refoulement. Une conduite (15) de retour de carburant partant de la conduite de refoulement est en outre prévue, qui présente un étranglement (16) à refoulement nul pour étrangler le carburant renvoyé. La conduite (15) de retour de carburant comprend en outre, en série avec l'étranglement (16) à refoulement nul, une soupape de trop-plein (17) qui interrompt le retour du carburant dans la conduite (15) de retour de carburant pendant la phase de démarrage du moteur à combustion interne et autorise le retour du carburant pendant le fonctionnement du moteur à combustion interne. On obtient ainsi un dispositif et un procédé de régulation d'un débit volumique de carburant dans une système (1) de circulation à basse pression qui présentent une structure simple et permettent une phase de démarrage fiable avec un petit volume refoulé.
EP07787121A 2006-08-09 2007-07-05 Dispositif et procédé pour réguler un débit volumique de carburant dans un système de circulation à basse pression pour un moteur à combustion interne Withdrawn EP2052147A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006037174A DE102006037174A1 (de) 2006-08-09 2006-08-09 Vorrichtung und Verfahren zur Regelung eines Kraftstoffvolumenstroms in einem Niederdruckkreislaufsystem für eine Verbrennungskraftmaschine
PCT/EP2007/056831 WO2008017547A1 (fr) 2006-08-09 2007-07-05 Dispositif et procédé pour réguler un débit volumique de carburant dans un système de circulation à basse pression pour un moteur à combustion interne

Publications (1)

Publication Number Publication Date
EP2052147A1 true EP2052147A1 (fr) 2009-04-29

Family

ID=38543024

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07787121A Withdrawn EP2052147A1 (fr) 2006-08-09 2007-07-05 Dispositif et procédé pour réguler un débit volumique de carburant dans un système de circulation à basse pression pour un moteur à combustion interne

Country Status (4)

Country Link
US (1) US20090205616A1 (fr)
EP (1) EP2052147A1 (fr)
DE (1) DE102006037174A1 (fr)
WO (1) WO2008017547A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109654528A (zh) * 2018-12-14 2019-04-19 重庆军通汽车有限责任公司 一种发烟机的燃油系统

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE487053T1 (de) 2008-03-04 2010-11-15 Magneti Marelli Spa Common rail direkteinspritzanordnung mit einem absperrventil zur steuerung der förderung einer hochdruckkraftstoffpumpe
ATE542994T1 (de) 2008-08-29 2012-02-15 Delphi Tech Holding Sarl Verbessertes brennstoffdruckregulationssystem und verbesserter brennstoffdruckregulator zur verwendung darin
US9316187B2 (en) * 2011-01-18 2016-04-19 Carter Fuel Systems, Llc Diesel fuel system with advanced priming
AT513154B1 (de) * 2012-09-17 2014-02-15 Bosch Gmbh Robert Niederdruckkreislauf für ein Kraftstoffeinspritzsystem
DE102013005665A1 (de) * 2013-04-03 2014-10-09 Volkswagen Aktiengesellschaft Hochdruckeinspritzsystem und Verfahren zum Betreiben eines Hochdruckeinspritzsystems
DE102014226074A1 (de) 2014-12-16 2016-06-16 Robert Bosch Gmbh Überströmventil für eine Kraftstoffpumpe
US10378500B2 (en) * 2016-09-27 2019-08-13 Caterpillar Inc. Protection device for limiting pump cavitation in common rail system

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2522374A1 (de) * 1975-05-21 1976-12-02 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
US4176641A (en) * 1976-12-30 1979-12-04 Cummins Engine Company, Inc. Aneroid for a turbocharged engine
DE2927110A1 (de) * 1979-07-05 1981-01-08 Audi Nsu Auto Union Ag Kraftstoff-einspritzanlage
DE3127543A1 (de) * 1981-07-11 1983-01-20 Robert Bosch Gmbh, 7000 Stuttgart "kraftstoffversorgungseinrichtung fuer brennkraftmaschinen"
DE3314633A1 (de) * 1982-12-28 1984-06-28 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzanlage
JPH0778383B2 (ja) * 1988-10-17 1995-08-23 日野自動車工業株式会社 ディーゼルエンジンの燃料系統自動エア抜き装置
US5269276A (en) * 1992-09-28 1993-12-14 Ford Motor Company Internal combustion engine fuel supply system
JPH06129322A (ja) * 1992-10-15 1994-05-10 Fuji Heavy Ind Ltd 高圧噴射式エンジンの燃料圧力制御方法
JP2853504B2 (ja) * 1993-03-16 1999-02-03 日産自動車株式会社 内燃機関の燃料噴射装置
DE19618707C2 (de) * 1996-05-09 1998-12-17 Siemens Ag Verfahren und Vorrichtung zur Regelung eines Kraftstoffvolumenstromes
US6024064A (en) * 1996-08-09 2000-02-15 Denso Corporation High pressure fuel injection system for internal combustion engine
FR2774132B1 (fr) * 1998-01-27 2000-04-07 Semt Pielstick Dispositif pour eviter la cavitation dans les pompes a injection
DE19832842C1 (de) * 1998-07-21 2000-02-17 Bosch Gmbh Robert Kraftstoff-Fördersystem zur Kraftstoffversorgung einer Brennkraftmaschine
DE19846157A1 (de) * 1998-10-07 2000-04-13 Bosch Gmbh Robert Pumpenanordnung zur Kraftstoffhochdruckerzeugung
DE19857249A1 (de) * 1998-12-11 2000-06-15 Bosch Gmbh Robert Kraftstoffeinspritzsystem
JP2003083191A (ja) * 2001-09-05 2003-03-19 Hitachi Unisia Automotive Ltd 燃料噴射装置
DE10208576A1 (de) * 2002-02-21 2003-09-11 Bosch Gmbh Robert Hydraulische Druckentlastungseinrichtung für eine Kraftstoffeinspritzanlage
DE10260775A1 (de) * 2002-12-23 2004-07-01 Daimlerchrysler Ag Kraftstoffversorgungssystem für Verbrennungsmotoren mit Direkteinspritzung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008017547A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109654528A (zh) * 2018-12-14 2019-04-19 重庆军通汽车有限责任公司 一种发烟机的燃油系统

Also Published As

Publication number Publication date
WO2008017547A1 (fr) 2008-02-14
DE102006037174A1 (de) 2008-02-14
US20090205616A1 (en) 2009-08-20

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