WO2005038236A1 - Systeme d'injection de carburant pour un moteur a combustion interne - Google Patents

Systeme d'injection de carburant pour un moteur a combustion interne Download PDF

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Publication number
WO2005038236A1
WO2005038236A1 PCT/DE2004/001688 DE2004001688W WO2005038236A1 WO 2005038236 A1 WO2005038236 A1 WO 2005038236A1 DE 2004001688 W DE2004001688 W DE 2004001688W WO 2005038236 A1 WO2005038236 A1 WO 2005038236A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
pump
pressure
metering device
feed pump
Prior art date
Application number
PCT/DE2004/001688
Other languages
German (de)
English (en)
Inventor
Stefan Kieferle
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 WO2005038236A1 publication Critical patent/WO2005038236A1/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
    • F02M63/023—Means for varying pressure in common rails
    • F02M63/0235—Means for varying pressure in common rails by bleeding fuel pressure
    • F02M63/025—Means for varying pressure in common rails by bleeding fuel pressure from the common rail
    • 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
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/18—Feeding by means of driven pumps characterised by provision of main and auxiliary 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
    • 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
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • 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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
    • 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 is based on one
  • Fuel injection device for an internal combustion engine according to the preamble of claim 1.
  • Such a fuel injection device is known from DE 100 02 132 AI.
  • This fuel injection device has a high-pressure pump through which fuel is injected into a. Memory is required.
  • a delivery pump is provided, through which fuel is delivered from a storage tank to the suction side of the high-pressure pump. There is a between the feed pump and the high pressure pump
  • Fuel metering device arranged by which the amount of fuel drawn in by the high pressure pump can be variably adjusted. At least one injector is connected to the memory, through which fuel is injected into the internal combustion engine. Between the
  • the feed pump and the fuel metering device return to the reservoir, which is controlled by a pressure valve.
  • the pressure valve is arranged near the high-pressure pump or integrated into it.
  • a filter is also arranged between the feed pump and the fuel metering device.
  • the return flow controlled by the pressure valve is used to set a certain pressure upstream of the fuel metering device and to return excess fuel that may be required from the feed pump to the reservoir.
  • Fuel injection device is that the total amount of fuel required by the feed pump through the Filter flows, even if it is diverted back into the storage container by the pressure valve via the return. For this reason, the filter must be designed for correspondingly large flow rates and it may have to be replaced after a short period of operation. At low temperatures, there is also a risk of the filter becoming clogged due to the constant large flow rates if the cold fuel becomes greasy. To ensure zero delivery of the high pressure pump, the connection of the fuel metering device with the
  • High-pressure pump connected to the return line which means that any fuel that does not close completely tightly is diverted from the suction side of the high-pressure pump. Since a relatively high pressure can be set in the return line depending on the fuel quantity controlled by the pressure valve, it must be ensured on the high-pressure pump that it does not draw in fuel from the return line.
  • the high-pressure pump has inlet valves which have to be set to a correspondingly high opening pressure. However, this has an adverse effect on the maximum delivery capacity of the high-pressure pump.
  • the fuel injection device according to the invention with the features according to claim 1 has the advantage that possibly too much fuel is pumped from the feed pump already in the reservoir, so that only the filter actually by the filter
  • the filter can thus be dimensioned correspondingly smaller, the operating time until it is required to be replaced can be extended and the risk of clogging due to contaminated fuel is reduced as a result
  • the opening pressure of the inlet valves of the high-pressure pump must be set low, so that their maximum delivery rate can be increased, since these have no connection with the return flow of the delivery pump in the storage container.
  • the high-pressure pump can be of simpler design, since the pressure valve can be omitted there and no connections from the pressure valve to the return are required.
  • Fuel injection device for an internal combustion engine in a schematic representation.
  • FIG. 1 shows a fuel injection device for an internal combustion engine, for example of a motor vehicle.
  • the internal combustion engine is preferably a self-igniting internal combustion engine and has one or more cylinders.
  • the motor vehicle has a fuel reservoir 10 in which fuel is stored for the operation of the internal combustion engine.
  • Fuel injection device has a feed pump 12, through which fuel is fed from the fuel reservoir 10 to a high-pressure pump 14.
  • the high-pressure pump 14 pumps fuel under high pressure into a reservoir 16, which can be tubular, for example, or in any other form.
  • From the store 16 leads at least one line 18 to at least one injector 20 arranged on a cylinder of the internal combustion engine, preferably a plurality of injectors 20 are connected to the memory 16.
  • An electrical control valve 22 is arranged on each of the injectors 20, through which an opening of the injectors is controlled, in order to thus effect fuel injection by the respective injector 20 or to prevent fuel injection.
  • the control valves 22 are controlled by an electronic control device 23, which determines the point in time and the duration of the fuel injection by the injectors 20 as a function of operating parameters of the internal combustion engine, such as, for example, speed, load, temperature and others.
  • the control valves 22 can have an electromagnetic actuator or a piezoelectric actuator.
  • a fuel return for unused fuel leads back from the injectors 20, for example via a line 24 common to all injectors 20.
  • a line 26 can also return from the accumulator 16 as a return to the fuel reservoir 10, in which a pressure limiting valve or pressure regulating valve 28 is arranged in order to prevent an impermissibly high pressure from building up in the accumulator 16 or the pressure prevailing in the accumulator 16 being able to be varied , Between the memory 16 and the injectors 20, one
  • Pressure increasing device 21 can be arranged, by means of which the pressure available for fuel injection is increased again compared to the pressure prevailing in the accumulator 16.
  • the pressure increasing device 21 is preferably integrated in the injector 20 and designed as a hydraulic pressure intensifier.
  • the fuel return 24 preferably leads away from the pressure increasing device 21 of the injectors 20.
  • the high pressure pump 14 is mechanically by the
  • the high-pressure pump 14 can be designed as a radial piston pump and has at least one or more pump elements 30, each of which has a pump piston 34 which is driven by a drive shaft 32 in a stroke movement and which delimits a pump working space 36.
  • the rotary movement of the drive shaft 32 can be converted into the lifting movement of the pump pistons 34 via an eccentric or cam drive.
  • Each pump element 30 has an inlet valve 38 opening into the pump working space 36 and an outlet valve 40 opening towards the accumulator 16.
  • a fuel metering device 42 is arranged between the feed pump 12 and the high pressure pump 14.
  • the fuel metering device 42 has a control valve 44 actuated, for example, by an electric actuator 43, preferably an electromagnet or a piezo actuator, by means of which the flow from the feed pump 12 to the high-pressure pump 14 is continuously adjustable.
  • the control valve 44 can be designed as a proportional valve through which the
  • Flow cross section between the feed pump 12 and the high pressure pump 14 is continuously variable.
  • the control valve 44 can also be opened and closed in a clocked manner, as a result of which an average effective flow cross-section between the feed pump 12 and the high-pressure pump 14 can be changed.
  • Fuel metering device 42 is preferably attached to or integrated in high-pressure pump 14, but can also be arranged separately from high-pressure pump 14. The fuel metering device 42 is operated by the
  • Control device 23 is controlled in such a way that a quantity of fuel is supplied to the high-pressure pump 14 by the feed pump 12, which in turn is then conveyed by the high-pressure pump 14 under high pressure into the accumulator 16 in order to have a predetermined pressure in the accumulator 16 which is dependent on operating parameters of the internal combustion engine maintain.
  • a pressure sensor 17 is arranged on the accumulator 16, which is connected to the control device 23 and which supplies a signal for the actual pressure in the accumulator 16.
  • the feed pump 12 has an electric drive and is arranged in the fuel tank 10.
  • a feed filter 46 is connected upstream of the feed pump 12 and a further filter 48 is arranged between the feed pump 12 and the fuel metering device 42.
  • a storage pot 50 can be arranged in the fuel reservoir 10, from which the feed pump 12 draws fuel and into which fuel is conveyed from the fuel reservoir 10 by means of a jet pump 52.
  • the propellant quantity of the jet pump 52 is supplied to it by the fuel return 26 from the accumulator 16.
  • the fuel return 24 from the injectors 20 can open into the connection between the feed pump 12 and the fuel metering device 42, for example upstream in front of the filter 48. Alternatively, the
  • Fuel return 24 of the injectors 20 also open into the return 26, which leads to the fuel reservoir 10.
  • a bypass connection 54 branches off from the connection between the filter 48 and the fuel metering device 42 to a drive region of the high-pressure pump 14.
  • the drive area of the high-pressure pump 14 is its drive shaft 32 and the area for converting the rotary movement of the drive shaft into the stroke movement of the pump pistons 34. Lubrication and cooling of the drive area is ensured by the fuel flowing into the drive area via the bypass connection 54.
  • a throttle point 55 is preferably arranged in the bypass connection 54 in order to limit the amount of fuel supplied to the drive area.
  • a return line 56 leads from the drive region of the high-pressure pump 14 to Fuel reservoir 10 back, which can open into the return 26 from the memory 16, for example. The return flow 56 ensures a constant flow through the drive area of the high-pressure pump 14.
  • a relief connection 58 leads from the connection between the fuel metering device 42 and the high-pressure pump 14, which opens into the return 26, for example.
  • a throttle point 59 is arranged, about which the
  • Relief connection 58 to limit the amount of fuel flowing out.
  • the relief connection 58 serves, in operating states in which no fuel may be conveyed into the accumulator 16 by the high-pressure pump 14, as a result of possible leakage of the fuel metering device 42, so that fuel which passes through it can still be discharged so that it is not sucked in by the high-pressure pump 14 , A low pressure prevails in the return 26, so that the opening pressure of the inlet valves 38 of the pump elements 30 can be set relatively low.
  • a check valve 60 opening towards the filter 48 is arranged.
  • a return line 62 leads between the feed pump 12 and the check valve 60
  • the return 62 preferably opens into the reservoir 50, from which the feed pump 12 sucks.
  • An at least approximately constant pressure is set by the pressure valve 64 in the connection between the feed pump 12 and the fuel metering device 42. If more fuel is delivered by the feed pump 12 than is sucked in by the high-pressure pump 14 through the fuel metering device 42 and reaches the drive area via the bypass connection 54, the excess amount is delivered
  • Fuel via the opened pressure valve 64 in the return 62 taxed.
  • Fuel via the opened pressure valve 64 in the return 62 taxed.
  • the filter 48 If the fuel quantity delivered by the feed pump 12 fluctuates as a result of voltage fluctuations in the vehicle electrical system, this is also compensated for by the pressure valve 64, so that there is an at least approximately constant pressure upstream of the fuel metering device 42.
  • the pressure level in the return 26 and thus in the relief connection 58 is not influenced by the amount of fuel that is discharged into the return 62 via the pressure valve 64.
  • the feed pump 12 draws fuel from the fuel reservoir 10 and delivers it through the fuel metering device 42 to the suction side of the high-pressure pump 14.
  • High-pressure pump 14 delivers fuel under high pressure into the reservoir 16.
  • Fuel is injected into the cylinders of the internal combustion engine by the injectors 20, the timing of the fuel injection and the injected fuel quantity being determined by the control valves 22 being controlled by the control device 23 as a function of operating parameters of the internal combustion engine.
  • the control device 23 Through the control device 23, the
  • Fuel metering device 42 is controlled in such a way that it sets such a large flow cross-section that the amount of fuel is sucked in by the high-pressure pump 14 and conveyed into the accumulator 16, which is required to maintain a predetermined pressure in the accumulator 16. If the high-pressure pump 14 draws in the entire fuel quantity delivered by the feed pump 12 and supplies it for lubrication in its drive area, then the pressure valve 64 closed and no fuel flows back into the fuel tank 10 via the return. If the delivery pump 12 delivers a larger quantity of fuel than is sucked in by the high-pressure pump 14 and is supplied for lubrication in its drive area, the pressure valve 64 opens, so that excess fuel is already diverted in the fuel reservoir 10.

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 présentant une pompe haute pression (14) par laquelle le carburant est refoulé sous haute pression dans un réservoir (16), le carburant étant refoulé d'un réservoir de stockage (10) par une pompe d'alimentation (12) vers le côté aspiration de cette pompe haute pression (14). Un dispositif de dosage de carburant (42) est placé entre la pompe d'alimentation (12) et la pompe haute pression (14), dispositif au moyen duquel la quantité de carburant aspirée par la pompe haute pression (14) peut être réglée de façon variable. Au moins un injecteur (20), par lequel le carburant est injecté dans le moteur à combustion interne, est relié au réservoir (16). Un filtre (48) est installé entre la pompe d'alimentation (12) et le dispositif de dosage de carburant (42). Un tuyau de retour (62), commandé par une soupape de pression (64), est dérivé de la liaison entre la pompe d'alimentation (12) et le dispositif de dosage de carburant (42), en amont du dispositif de dosage de carburant (42), jusqu'au réservoir de stockage (10). La pompe d'alimentation (12) présente un entraînement électrique et est installée dans le réservoir de stockage (10). Le tuyau de retour (62) est dérivé de la liaison entre la pompe d'alimentation (12) et le filtre (48) jusqu'au réservoir de stockage (10).
PCT/DE2004/001688 2003-09-19 2004-07-28 Systeme d'injection de carburant pour un moteur a combustion interne WO2005038236A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10343482.8 2003-09-19
DE2003143482 DE10343482A1 (de) 2003-09-19 2003-09-19 Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine

Publications (1)

Publication Number Publication Date
WO2005038236A1 true WO2005038236A1 (fr) 2005-04-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2004/001688 WO2005038236A1 (fr) 2003-09-19 2004-07-28 Systeme d'injection de carburant pour un moteur a combustion interne

Country Status (2)

Country Link
DE (1) DE10343482A1 (fr)
WO (1) WO2005038236A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102203405A (zh) * 2008-11-05 2011-09-28 欧陆汽车有限责任公司 用于内燃机的喷射设备

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006027486A1 (de) 2006-06-14 2007-12-20 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE102010031622A1 (de) 2010-07-21 2012-01-26 Robert Bosch Gmbh Kraftstofffördereinrichung
JP2012167559A (ja) * 2011-02-10 2012-09-06 Denso Corp 燃料噴射装置
DE102012203549A1 (de) * 2012-03-07 2013-09-12 Robert Bosch Gmbh Kraftstoffeinspritzsystem

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2764003A1 (fr) * 1997-06-02 1998-12-04 Magneti Marelli France Purge d'une rampe d'injecteurs d'un moteur a injection directe
DE19741297A1 (de) * 1997-09-19 1999-03-25 Pierburg Ag Brennstoffversorgungssystem einer Brennkraftmaschine
DE19753155A1 (de) * 1997-11-29 1999-06-02 Mannesmann Rexroth Ag Kraftstoffversorgungssystem für eine Brennkraftmaschine und darin verwendete Hochdruckpumpe
DE10056048A1 (de) * 2000-11-11 2002-06-06 Bosch Gmbh Robert Kraftstoffeinspritzanlage für Brennkraftmaschinen mit Kraftstoffvorwärmung
US20020078928A1 (en) * 2000-12-27 2002-06-27 Mitsubishi Denki Kabushiki Kaisha Variable delivery type fuel supply apparatus
US20030047217A1 (en) * 2001-09-07 2003-03-13 Pierburg Gmbh Precompression control arrangement
EP1342912A2 (fr) * 2002-03-07 2003-09-10 Volkswagen Aktiengesellschaft Système d'alimentation en carburant pour un moteur à combustion interne

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2764003A1 (fr) * 1997-06-02 1998-12-04 Magneti Marelli France Purge d'une rampe d'injecteurs d'un moteur a injection directe
DE19741297A1 (de) * 1997-09-19 1999-03-25 Pierburg Ag Brennstoffversorgungssystem einer Brennkraftmaschine
DE19753155A1 (de) * 1997-11-29 1999-06-02 Mannesmann Rexroth Ag Kraftstoffversorgungssystem für eine Brennkraftmaschine und darin verwendete Hochdruckpumpe
DE10056048A1 (de) * 2000-11-11 2002-06-06 Bosch Gmbh Robert Kraftstoffeinspritzanlage für Brennkraftmaschinen mit Kraftstoffvorwärmung
US20020078928A1 (en) * 2000-12-27 2002-06-27 Mitsubishi Denki Kabushiki Kaisha Variable delivery type fuel supply apparatus
US20030047217A1 (en) * 2001-09-07 2003-03-13 Pierburg Gmbh Precompression control arrangement
EP1342912A2 (fr) * 2002-03-07 2003-09-10 Volkswagen Aktiengesellschaft Système d'alimentation en carburant pour un moteur à combustion interne

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102203405A (zh) * 2008-11-05 2011-09-28 欧陆汽车有限责任公司 用于内燃机的喷射设备
US8651089B2 (en) 2008-11-05 2014-02-18 Continental Automotive Gmbh Injection system for an internal combustion engine

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