EP1357283A2 - Dispositif d'injection de carburant pour un moteur à combustion interne - Google Patents

Dispositif d'injection de carburant pour un moteur à combustion interne Download PDF

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Publication number
EP1357283A2
EP1357283A2 EP03004643A EP03004643A EP1357283A2 EP 1357283 A2 EP1357283 A2 EP 1357283A2 EP 03004643 A EP03004643 A EP 03004643A EP 03004643 A EP03004643 A EP 03004643A EP 1357283 A2 EP1357283 A2 EP 1357283A2
Authority
EP
European Patent Office
Prior art keywords
pump
fuel
pressure
suction 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.)
Granted
Application number
EP03004643A
Other languages
German (de)
English (en)
Other versions
EP1357283A3 (fr
EP1357283B1 (fr
Inventor
Stefan Kieferle
Achim Koehler
Sascha Ambrock
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 EP1357283A2 publication Critical patent/EP1357283A2/fr
Publication of EP1357283A3 publication Critical patent/EP1357283A3/fr
Application granted granted Critical
Publication of EP1357283B1 publication Critical patent/EP1357283B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/464—Inlet valves of the check valve type
    • 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 by DE 198 48 035 A1 known.
  • This fuel injector has a high-pressure pump that is used for a common rail injection system is provided, in which by the High pressure fuel pump under high pressure in a store is promoted. With the memory are on the cylinders of the Internal combustion engine arranged injectors connected. Commonly used in common rail injection systems Delivery pump provided by the fuel from a Storage container is pumped to the high pressure pump.
  • the High pressure pump has several pump elements, each with a working space delimiting in one stroke driven pump piston. It's a in the work space opening suction valve provided that the suction stroke of the Pump piston opens and through the fuel in the Workspace flows in.
  • the suction valve has a through Closing spring acted upon in a closing direction Valve member, with the closing spring on the pump piston supported. At the beginning of the suction stroke of the piston is through this compresses the closing spring the most, so that the Pressure at which the suction valve opens is higher than during the suction stroke of the pump piston during which the closing spring is increasingly relaxed. Under certain Operating conditions of the internal combustion engine, especially in Overrun, no fuel should be generated by the push-up pump be promoted to memory. To ensure this the opening differential pressure of the suction valve becomes relatively high set, for example to at least 2 bar. this leads to however, that the delivery rate of the high pressure pump is not is optimal.
  • the fuel injection device according to the invention with the Features according to claim 1 has the advantage that the minimum opening differential pressure of the suction valve very much low and therefore the delivery rate of the high pressure pump is improved.
  • FIG. 1 shows a Fuel injection device for an internal combustion engine of a motor vehicle in a schematic representation with a High-pressure pump
  • Figure 2 one designated in Figure 1 with II Section of the high pressure pump in an enlarged view with a pump piston at top dead center
  • FIG. 3 Section II with the pump piston in a lower one Dead center.
  • FIG. 1 is a fuel injection device for a Internal combustion engine, for example of a motor vehicle shown.
  • the internal combustion engine is preferably one self-igniting internal combustion engine and has one or several cylinders.
  • the fuel injector has a feed pump 10 which, for example, in a Fuel tank 12 of the motor vehicle arranged is, however, also be arranged outside the container 12 can.
  • the feed pump 10 can be an electric one Have drive motor and sucks in, for example Prefilter 14 fuel from the fuel tank 12 on.
  • the feed pump 10 can also be mechanical, for example are driven by the internal combustion engine. From the outlet the feed pump 10 leads a line 16 to a High pressure pump 18. Between the feed pump 10 and the High pressure pump 18 is a fuel filter in line 16 20 arranged, which is designed as a fine filter and that of the fuel delivered by the feed pump 10 is flowed through.
  • the high pressure pump 18 has, for example, several Pump elements 22, each one in one Have cylinder bore 24 guided pump piston 26, the via an eccentric drive 28 in one stroke is driven.
  • the high pressure pump 18 is preferred mechanically driven by the internal combustion engine.
  • the fuel delivered by the high pressure pump 18 is about a line 30 is fed to a memory 32.
  • each Pump element 22 has a delimited by the pump piston 26 Working space 34 into which an inlet from the feed pump 10 opens out and from which a sequence leads to the memory 32.
  • suction valve 36 In the inflow of each pump element 22 is in the work space 34 opening suction valve 36 provided and in the course of each Pump element 22 is an opening towards the reservoir 32 Pressure valve 38 is provided.
  • each injector 40 for each cylinder of the internal combustion engine 40 provided by the fuel in the combustion chamber of the Cylinder is injected.
  • Each injector 40 is over one Line 42 connected to the memory 32 and the opening of the Injector 40 for fuel injection is replaced by a electrically controlled valve 44 controlled by a electronic control device 46 is controlled.
  • a electrically controlled valve 44 controlled by a electronic control device 46 is controlled.
  • Of the injectors 40 can return 41 to Remove fuel tank 12 for not injected fuel.
  • a pressure valve 48 can be provided, that opens when a specified pressure is exceeded and a return via a line 50 from the memory 32 in the Fuel tank 12 releases.
  • a pressure sensor 52 through which the pressure is detected in the memory 32 and electrically with the Control device 46 is connected, which is thus a signal for the pressure prevailing in the accumulator 32 is supplied.
  • a high pressure pump 18 can be provided with a return 54 which, for example, leak a leakage of fuel can and which can open into line 50.
  • a fuel metering device 60 In the connection between the feed pump 10 and the High pressure pump 18 is a fuel metering device 60 arranged through which a flow cross section of the Connection to the high pressure pump 18 is set.
  • the Fuel metering device 60 is by the Control device 46 driven.
  • the Fuel metering device 60 has a flow control valve 62 on and an actuator 64 by the control device 46 is controlled.
  • By means of the flow control valve 62 can the flow cross section of the connection to High pressure pump 18 can be continuously adjusted between Zero and a maximum flow area.
  • actuator 64 an electromagnet or a piezo actuator can be used, each by the control device 46 with a defined electrical voltage and is supplied the flow control valve 62 in a defined position brings in which this has a defined flow cross-section releases.
  • the Internal combustion engine is allowed through the high pressure pump 18 has no fuel in the accumulator 32 be promoted.
  • the Fuel metering device 60 the flow cross section of the feed pump 10 to the high pressure pump 18 completely closed, so that the high pressure pump 18 no fuel flows more.
  • a target pressure in the memory 32nd specified.
  • the pressure sensor 52 receives the Control device 46 a signal for the actual pressure in the memory 32.
  • the pressure in the memory 32 is dependent on that by the High pressure pump 18 promoted in the memory 32 Fuel quantity.
  • the pumped by the high pressure pump 18 The amount of fuel can be changed by using of the fuel metering device 60 is the flow cross section the connection to the feed pump 10 is changed.
  • the Fuel metering device 60 is by the Control device 46 controlled so that this in the Connection to the feed pump 10 a flow cross section sets that is so large that that of the high pressure pump 18th inflowing amount of fuel is so large that by the High pressure pump 18 pumped into the memory 32 Amount of fuel to maintain the specified Target pressure in the memory 32 is sufficient. If the actual pressure in Memory 32 is less than the target pressure, so by the high pressure pump 18 has too little fuel promoted and by the control device Fuel metering device 60 is controlled such that it a larger flow cross section in the connection to Feed pump 10 releases and thus by the High pressure pump 18 delivered amount of fuel is increased.
  • the high pressure pump 18 becomes too large Fuel quantity promoted and by the control device 46 the fuel metering device 60 is controlled in such a way that this has a smaller flow cross section in the Releases connection to the feed pump 10 and thus through the high pressure pump 18 reduced amount of fuel delivered becomes.
  • the suction valve is shown below with reference to FIGS 36 of a pump element 22 explained in detail, all Pump elements 22 are identical.
  • one Housing part 70 of high-pressure pump 18 is an inlet channel 72 for the fuel delivered by the feed pump 10 in the Working space 34 is formed.
  • a valve seat 74 formed, for example, at least is approximately conical.
  • the suction valve 36 has a valve member 76, for example in the form of a Ball is formed and that with the valve seat 74 Control of the connection of the inlet channel 72 with the Working space 34 cooperates.
  • the valve member 76 is for example, arranged in a direction toward the pump piston 26 Carrier part 78 added.
  • the suction valve 36 also has a closing spring 80, which, for example, as Helical compression spring is formed and between the Pump piston 26 and the support member 78 is clamped.
  • a closing spring 80 becomes the valve member 76 in Closing direction pressed toward valve seat 74.
  • the Valve member 76 is also by the in the working space 34th prevailing pressure in the closing direction.
  • the pump piston 26 has on its the valve member 76 end facing a reduced diameter extension 82 on, at the transition from the full diameter of the Pump piston 26, on which it is in the cylinder bore 24 an annular shoulder 84 for the extension 82 is formed, on which the closing spring 80 is supported.
  • the Closing spring 80 surrounds extension 82 and carrier part 78 is then arranged on the extension 82. If the pump piston 26 is at its top dead center, the is the stroke position in which the pump piston 26 is closest is arranged towards the housing part 70, so between the Extension 82 of the pump piston 26 and the carrier part 78 Distance in the direction of the longitudinal axis 27 of the pump piston 26 present when the valve member 76 is in its Is in the closed position in which it is on the valve seat 74 is applied.
  • the front end of the Extension 82 of the pump piston 26 a stop Limiting the opening movement of the valve member 76 forms by the carrier part 78 coming to rest on the extension 82. If the pump piston 26 as shown in FIG is at its top dead center, the closing spring 80 of the suction valve 36 highly compressed and exercises accordingly a high force on the valve member 76 with which this is pressed against the valve seat 74. The one through the Closing spring 80 and by the in the working space 34th prevailing pressure generated force on the valve member 76th acts on the pressure prevailing in the inlet channel 72 the valve member 76 generates force in the opening direction opposite.
  • the pump piston 26 moves from its top dead center according to Figure 2 to its bottom dead center according to Figure 3.
  • the Closing spring 80 increasingly relaxed, so that this one less force in the closing direction on the valve member 76 causes and according to the opening differential pressure of the Suction valve 36 is lower. If the pump piston 26 is at its top dead center at the start of the suction stroke, so is the opening differential pressure of the suction valve 36 am highest and is subsequently called the maximum Opening differential pressure called.
  • the opening differential pressure decreases, being in an area of the middle suction stroke that is a middle stroke position of the pump piston 26 between its top dead center and its bottom dead center average opening differential pressure of the suction valve 36 results.
  • the opening differential pressure of the suction valve 36 When the pump piston 26 is at its bottom dead center is the opening differential pressure of the suction valve 36 least and is subsequently considered to be the minimum Opening differential pressure called. It is provided that the minimum opening differential pressure of the suction valve 36 is less than 0.9 bar, preferably at most 0.8 bar.
  • the mean opening differential pressure and the maximum Opening differential pressure of the suction valve 36 are then dependent from the spring rate c of the closing spring 80, that is the Change in the force generated by this in relation to the Travel, and from the stroke of the pump piston 26 between the top and bottom dead center.
  • the spring rate c the Closing spring 80 can have a small value, whereby the force exerted by the closing spring 80 on the Valve member 76, however, over the relatively large suction stroke of the Pump piston 26 changes significantly.
  • the middle one Opening differential pressure of the suction valve 36 is greater than 0.9 bar.
  • the ratio between the middle Opening differential pressure and the minimum Opening differential pressure of suction valve 36 is greater than 1 and is at most about 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)
EP03004643.7A 2002-04-23 2003-03-03 Dispositif d'injection de carburant pour un moteur à combustion interne Expired - Lifetime EP1357283B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10218022A DE10218022A1 (de) 2002-04-23 2002-04-23 Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10218022 2002-04-23

Publications (3)

Publication Number Publication Date
EP1357283A2 true EP1357283A2 (fr) 2003-10-29
EP1357283A3 EP1357283A3 (fr) 2004-09-22
EP1357283B1 EP1357283B1 (fr) 2014-07-02

Family

ID=28685246

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03004643.7A Expired - Lifetime EP1357283B1 (fr) 2002-04-23 2003-03-03 Dispositif d'injection de carburant pour un moteur à combustion interne

Country Status (4)

Country Link
US (1) US6959694B2 (fr)
EP (1) EP1357283B1 (fr)
JP (1) JP4395319B2 (fr)
DE (1) DE10218022A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004040128A1 (fr) * 2002-10-31 2004-05-13 Robert Bosch Gmbh Pompe haute pression d'alimentation en carburant comprenant un clapet a bille dans l'admission basse pression
WO2008092780A1 (fr) * 2007-01-30 2008-08-07 Continental Automotive Gmbh Pompe haute pression et installation d'injection pour un moteur à combustion interne équipé d'une pompe haute pression
EP2226491A1 (fr) * 2009-02-16 2010-09-08 C.R.F. Società Consortile per Azioni Système d'injection de carburant pour moteur à combustion interne

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7387109B2 (en) * 2003-10-21 2008-06-17 Robert Bosch Gmbh High-pressure fuel pump for an internal combustion engine
DE102004028999A1 (de) * 2004-06-16 2006-01-05 Robert Bosch Gmbh Hochdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine
EP1674716B1 (fr) * 2004-12-23 2010-12-15 C.R.F. Società Consortile per Azioni Système d'injection de carburant comprenant une pompe à carburant à haute pression à débit variable
DE102005033638A1 (de) * 2005-07-19 2007-01-25 Robert Bosch Gmbh Kraftstoff-Fördereinrichtung, insbesondere für eine Brennkraftmaschine
JP4870015B2 (ja) * 2006-06-13 2012-02-08 京三電機株式会社 圧力調整弁
US8234784B2 (en) * 2008-02-13 2012-08-07 Younger Steven W Valve piston repositioning apparatus and method
DE102009028023A1 (de) * 2009-07-27 2011-02-03 Robert Bosch Gmbh Hochdruck-Einspritzsystem mit Kraftstoffkühlung aus Niederdruckbereich
US10012228B2 (en) * 2014-04-17 2018-07-03 Danfoss Power Solutions Gmbh & Co. Ohg Variable fluid flow hydraulic pump
JP2020118093A (ja) * 2019-01-24 2020-08-06 株式会社デンソー 燃料噴射ポンプ
CN113653581A (zh) * 2021-08-19 2021-11-16 北油电控燃油喷射系统(天津)有限公司 一种喷油泵用进出油阀组件
DE102021212771A1 (de) 2021-11-12 2023-05-17 Robert Bosch Gesellschaft mit beschränkter Haftung Pumpe, insbesondere Kraftstoffhochdruckpumpe

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19941850A1 (de) 1999-09-02 2001-03-15 Siemens Ag Einspritzanlage für eine Brennkraftmaschine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995025887A1 (fr) * 1994-03-23 1995-09-28 Siemens Aktiengesellschaft Systeme permettant d'injecter du carburant dans les cylindres d'un moteur a combustion interne
DE19846157A1 (de) 1998-10-07 2000-04-13 Bosch Gmbh Robert Pumpenanordnung zur Kraftstoffhochdruckerzeugung
DE19848035A1 (de) 1998-10-17 2000-04-20 Bosch Gmbh Robert Radialkolbenpumpe für Kraftstoffhochdruckerzeugung
DE19902259B4 (de) * 1999-01-21 2006-02-23 Siemens Ag Montageverfahren
IT1310755B1 (it) * 1999-11-30 2002-02-22 Elasis Sistema Ricerca Fiat Pompa idraulica ad alta pressione, in particolare pompa a pistoniradiali per il carburante di un motore a combustione interna.
US6764286B2 (en) * 2001-10-29 2004-07-20 Kelsey-Hayes Company Piston pump with pump inlet check valve

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19941850A1 (de) 1999-09-02 2001-03-15 Siemens Ag Einspritzanlage für eine Brennkraftmaschine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004040128A1 (fr) * 2002-10-31 2004-05-13 Robert Bosch Gmbh Pompe haute pression d'alimentation en carburant comprenant un clapet a bille dans l'admission basse pression
US7273036B2 (en) 2002-10-31 2007-09-25 Robert Bosch Gmbh High-pressure fuel pump with a ball valve in the low-pressure inlet
WO2008092780A1 (fr) * 2007-01-30 2008-08-07 Continental Automotive Gmbh Pompe haute pression et installation d'injection pour un moteur à combustion interne équipé d'une pompe haute pression
EP2226491A1 (fr) * 2009-02-16 2010-09-08 C.R.F. Società Consortile per Azioni Système d'injection de carburant pour moteur à combustion interne

Also Published As

Publication number Publication date
JP4395319B2 (ja) 2010-01-06
EP1357283A3 (fr) 2004-09-22
US6959694B2 (en) 2005-11-01
EP1357283B1 (fr) 2014-07-02
JP2003314409A (ja) 2003-11-06
DE10218022A1 (de) 2003-11-06
US20030213471A1 (en) 2003-11-20

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