EP0882180A1 - Systeme d'injection de carburant - Google Patents

Systeme d'injection de carburant

Info

Publication number
EP0882180A1
EP0882180A1 EP97931698A EP97931698A EP0882180A1 EP 0882180 A1 EP0882180 A1 EP 0882180A1 EP 97931698 A EP97931698 A EP 97931698A EP 97931698 A EP97931698 A EP 97931698A EP 0882180 A1 EP0882180 A1 EP 0882180A1
Authority
EP
European Patent Office
Prior art keywords
injection
pump
valve
fuel
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
EP97931698A
Other languages
German (de)
English (en)
Other versions
EP0882180B1 (fr
Inventor
Nestor Rodriguez-Amaya
Stephan Jonas
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 EP0882180A1 publication Critical patent/EP0882180A1/fr
Application granted granted Critical
Publication of EP0882180B1 publication Critical patent/EP0882180B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/06—Pumps peculiar thereto
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/06—Pumps peculiar thereto
    • F02M45/063—Delivery stroke of piston being divided into two or more parts, e.g. by using specially shaped cams
    • 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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/10—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor
    • F02M41/12—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor
    • 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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/10—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor
    • F02M41/12—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor
    • F02M41/123—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor characterised by means for varying fuel delivery or injection timing
    • F02M41/125—Variably-timed valves controlling fuel passages
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/083—Having two or more closing springs acting on injection-valve
    • 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
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • 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
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F04B49/22—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 by means of valves
    • F04B49/225—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 by means of valves with throttling valves or valves varying the pump inlet opening or the outlet opening
    • 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
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0209—Rotational speed

Definitions

  • the invention is based on a fuel injection system according to the preamble of claim 1.
  • a distributor injection pump is provided as the fuel injection pump, with a reciprocatingly driven and at the same time rotating pump piston, each of which, during its rotational movement and its pumping stroke, has one of several injection lines which lead to one fuel injection valve each, supplied with fuel brought to the injection pressure.
  • the electrically controlled valve which is a solenoid valve
  • the electrically controlled valve is opened briefly in order to relieve the pump work space and to briefly reduce the fuel pressure achieved.
  • a very fast switching solenoid valve is required, which requires considerable effort in the electrical control and in the construction of the valve.
  • a special pressure valve is also provided in the connection between the pump work chamber and the injection valve
  • High-pressure fuel delivery to the fuel injector opens in the direction of delivery and closes at the end of the injection and which is suitable for pressure waves between the To dismantle the pressure valve and the fuel injection valve and to maintain a desired constant stand pressure in this area during the injection breaks.
  • the solution according to the invention makes it much easier to control an injection divided into a pre-injection and a main injection. Due to the interruption given by the design of the cam, there is no need for an electrical control with the opening and re-closing of the electrically controlled valve to interrupt the injection between the pre-injection and the main injection and the associated effort.
  • the electrically controlled valve also does not need to have the high switching speed which is required for precise control of the injection pause between the pre-injection and the main injection and can be considerably simpler and smaller than a valve which switches very quickly.
  • FIG. 1 shows a basic illustration of a fuel injection pump which is controlled by a solenoid valve
  • FIG. 2 shows a course of the cam track according to the invention in the form of a cam elevation curve over the angle of rotation description
  • the solution according to the invention is implemented using a distributor injection pump, as is shown schematically in FIG. 1.
  • a distributor injection pump of the axial piston type although the subject matter of the invention can also be used in other fuel injection pumps, such as, for. B. distributor injection pumps of the radial piston pump type or individual pumps with only one pump piston for supplying a single cylinder of an internal combustion engine or in-line pumps.
  • the invention can be implemented particularly advantageously in a distributor injection pump because only a single electrically controlled valve is required for supplying the injection valves and the distribution to the individual injection valves is carried out with the aid of the distributor.
  • a pump piston 1 is provided which is in a
  • Cylinder bore 2 is arranged to be displaceable and rotatable and includes a pump working space 10 there at the end.
  • the pump piston is provided with a cam 6, which has axially downward facing cams 5 of the embodiment according to the invention, for. B. coupled via a spring, not shown.
  • the cam disk is driven in a known manner in a rotating manner, in particular in synchronism with the speed of the internal combustion engine supplied by the injection pump, the cam disk running under the influence of the spring on a known axially fixed roller ring and subsequently the rotating pump and distributor piston set in a reciprocating promoting and sucking motion.
  • the pump piston When it rotates in association with one Pump delivery stroke, in which fuel is displaced under high pressure from the pump work chamber 10, the pump piston comes into connection with one of several injection lines 7 via a distributor groove 8 in the outer surface of the pump and distributor piston.
  • the distributor groove is continuously connected to the pump work space via a longitudinal channel 9.
  • the injection line leads via a pressure valve 12 to a fuel injection valve 13, which is assigned to the respective cylinder of an internal combustion engine.
  • the pump working chamber 10 is supplied with fuel via a suction line 15, which is supplied by a suction chamber 17, which is essentially only shown in broken lines and is enclosed within the housing of the fuel injection pump.
  • the suction chamber receives fuel from a Kraf feed pump 18, which is synchronous with the fuel injection pump, for. B. is driven by the drive shaft and thus promotes fuel in speed-dependent amounts in the suction chamber.
  • a Kraf feed pump 18 which is synchronous with the fuel injection pump, for. B. is driven by the drive shaft and thus promotes fuel in speed-dependent amounts in the suction chamber.
  • an additional pressure control valve 19 the pressure in the suction chamber is usually controlled as a function of speed, if additional functions of the fuel injection pump are to be controlled with the aid of this pressure.
  • Fuel continuously flows back to the reservoir 23 via an overflow throttle 22, so that cooling of the injection pump or degassing of the suction chamber is thereby ensured.
  • the suction line 15 leads via a check valve 16 into the pump work space, the check valve opening in the direction of the pump work space.
  • an electrically controlled valve 24 is provided, which controls a bypass line 21 to the pressure valve 16 and with the aid of which a connection is established between the pump work chamber 10 and the suction chamber 17 when the valve is opened and the pump work chamber 10 is closed when the valve is closed . That as a Electrically controlled valve 24 symbolizing magnetic valve is controlled by a control device 25 in accordance with operating parameters in a manner known per se. With a sufficiently large flow cross section of the valve 24, the check valve 16 can also be omitted. In this case, the pump work space is only filled via the electrically controlled valve during the suction stroke.
  • this electrically controlled valve With the help of this electrically controlled valve, the start of the high-pressure delivery of the pump piston is controlled in such a way that, with the help of this valve, the start of injection is ultimately also controlled.
  • injection pressure builds up in the pump work space 10, which is supplied to one of the injection lines 7 via the longitudinal channel 9 and the distributor groove 8.
  • the electrically controlled valve is reopened, the high-pressure delivery is interrupted, so that the closing time of the valve determines the injection timing and the injection quantity.
  • This valve can now also be used for pre-injection without special control.
  • the delivery sides of the cam flanks of the cams 5 are designed in such a way that, as shown in FIG. 2, they produce a stroke profile of the pump piston over time, which is divided into a first region V which ends after the delivery stroke of the piston after a small delivery stroke , in a second area P in which the piston is then set into a retrograde movement, so that high-pressure delivery is effectively ended and an injection break occurs, and finally in a third area H, in which the cam flank rises again and the pump piston for further delivery Main injection quantity shifts.
  • FIG. 2 The diagram in FIG.
  • the electrically controlled valve for example a solenoid valve or a valve actuated by a piezo
  • the electrically controlled valve for example a solenoid valve or a valve actuated by a piezo
  • the electrically controlled valve is closed to control the start of the pre-injection quantity delivery and thus the start of injection at point FB and only at the end of the main injection again at the point FE is opened.
  • the injection is interrupted solely because no effective high-pressure delivery is possible through the cam region P.
  • the duration of the interruption of the high-pressure injection can in principle take place with cam angles kept constant, in particular independently of the switching speed of the electrically controlled valve and the speed. In individual cases, it is also possible to modify the shape of the cam, in the sense of the deliberate split injection.
  • the piston can simply remain in its position or be moved only so slightly that its movement is not sufficient to enable an injection of any kind worth mentioning, in such a way that an effective spray pause occurs, which supplies the fuel reduced in the combustion chamber of the internal combustion engine overall so that the pressure rise in the combustion chamber becomes smaller and so low-noise combustion can be achieved.
  • the fuel injection pump of the type according to the invention advantageously supplies injection valves which are suitable for injecting at a divided injection rate and thereby provide a smaller injection cross section for the pre-injection than for the main injection.
  • injection valves are known and need not be described in more detail here. For this purpose, reference is made, for example, to DE -C2-36 06 246. With the help of such designed injection valves can be much more precise the required injection pause between pre and main injection are observed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)

Abstract

La présente invention porte sur un système d'injection de carburant, comprenant une pompe d'injection, dont l'alimentation en haute pression est assurée par une soupape à commande électrique opérant par un canal de décharge (30), la phase étant déterminée par la fermeture de la soupape. Pour effectuer une injection en deux temps, à savoir une injection préalable et une injection principale, et pour simplifier l'excitation de la soupape à commande électrique (24), la came (5) actionnant le piston de pompe (1) est formée de manière à offrir une zone (P) où le piston de pompe se fige dans sa position ou se retire pour interrompre l'injection entre l'injection préalable et l'injection principale.
EP97931698A 1996-11-25 1997-07-02 Pompe d'injection de carburant de type distributrice Expired - Lifetime EP0882180B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19648690A DE19648690A1 (de) 1996-11-25 1996-11-25 Kraftstoffeinspritzsystem
DE19648690 1996-11-25
PCT/DE1997/001380 WO1998023858A1 (fr) 1996-11-25 1997-07-02 Systeme d'injection de carburant

Publications (2)

Publication Number Publication Date
EP0882180A1 true EP0882180A1 (fr) 1998-12-09
EP0882180B1 EP0882180B1 (fr) 2002-10-23

Family

ID=7812662

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97931698A Expired - Lifetime EP0882180B1 (fr) 1996-11-25 1997-07-02 Pompe d'injection de carburant de type distributrice

Country Status (12)

Country Link
US (1) US6016786A (fr)
EP (1) EP0882180B1 (fr)
JP (1) JP2000504388A (fr)
KR (1) KR100539986B1 (fr)
CN (1) CN1079495C (fr)
CZ (1) CZ291287B6 (fr)
DE (2) DE19648690A1 (fr)
HU (1) HU220411B (fr)
PL (1) PL186623B1 (fr)
RU (1) RU2177559C2 (fr)
SK (1) SK284424B6 (fr)
WO (1) WO1998023858A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19834121A1 (de) * 1998-07-29 2000-02-03 Bosch Gmbh Robert Kraftstoffversorgungsanlage einer Brennkraftmaschine
DE19926308A1 (de) * 1999-06-09 2000-12-21 Bosch Gmbh Robert Pumpenanordnung für Kraftstoff
DE19948149A1 (de) * 1999-10-07 2001-04-12 Volkswagen Ag Kraftstofförderanlage und Verfahren zum Betrieb der Kraftstofförderanlage
DE10106095A1 (de) * 2001-02-08 2002-08-29 Bosch Gmbh Robert Kraftstoffsystem, Verfahren zum Betreiben des Kraftstoffsystems, Computerprogramm sowie Steuer- und/oder Regelgerät zur Steuerung des Kraftstoffsystems
US7520635B2 (en) * 2003-07-02 2009-04-21 S.C. Johnson & Son, Inc. Structures for color changing light devices
FI119120B (fi) * 2004-01-23 2008-07-31 Waertsilae Finland Oy Laitteisto ja menetelmä polttoaineen ruiskutuspaineen muokkaamiseksi
DE102010026159A1 (de) * 2010-07-06 2012-01-12 Audi Ag Kraftstoffsystem für eine Brennkraftmaschine
JP5706850B2 (ja) * 2012-05-21 2015-04-22 株式会社丸山製作所 往復動ポンプ
DE102013206674A1 (de) * 2013-04-15 2014-10-16 Robert Bosch Gmbh Verfahren und Vorrichtung zur Ansteuerung eines Mengensteuerventils
CN103644059B (zh) * 2013-12-05 2016-05-04 中国第一汽车股份有限公司无锡油泵油嘴研究所 一种采用分层式燃油分配器的蓄压式供油系统
DE102018103252B4 (de) * 2018-02-14 2022-01-20 Danfoss Power Solutions Gmbh & Co. Ohg Verfahren und Vorrichtung zur Entlüftung der Ansaugseite einer künstlich kommutierten Hydraulikpumpe

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
FR91309E (fr) * 1965-11-09 1968-05-24 Inst Francais Du Petrole Dispositif de double injection
US3698373A (en) * 1969-12-22 1972-10-17 Mitsubishi Motors Corp Fuel injection system for diesel engine
GB2102890B (en) * 1981-06-26 1984-09-12 Lucas Ind Plc Fuel pumping apparatus
DE3147467C1 (de) * 1981-12-01 1983-04-21 Daimler-Benz Ag, 7000 Stuttgart Einspritzanlage fuer Brennkraftmaschinen
US4838232A (en) * 1984-08-14 1989-06-13 Ail Corporation Fuel delivery control system
DE3445825A1 (de) * 1984-12-15 1986-06-19 Klöckner-Humboldt-Deutz AG, 5000 Köln Brennstoffeinspritzsystem
US4962743A (en) * 1989-06-06 1990-10-16 Cummins Engine Company, Inc. Injection rate control cam
DE4016309A1 (de) * 1990-05-21 1991-11-28 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
JPH05157019A (ja) * 1991-12-06 1993-06-22 Hino Motors Ltd 燃料噴射装置
DE4223728C2 (de) * 1992-07-18 1999-02-18 Daimler Benz Ag Ventilgesteuerte Einspritzvorrichtung, insbesondere für eine luftverdichtende Einspritzbrennkraftmaschine

Non-Patent Citations (1)

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Title
See references of WO9823858A1 *

Also Published As

Publication number Publication date
PL327975A1 (en) 1999-01-04
US6016786A (en) 2000-01-25
KR100539986B1 (ko) 2006-02-28
DE19648690A1 (de) 1998-05-28
PL186623B1 (pl) 2004-02-27
CN1079495C (zh) 2002-02-20
DE59708561D1 (de) 2002-11-28
WO1998023858A1 (fr) 1998-06-04
KR19990076796A (ko) 1999-10-15
SK90398A3 (en) 1999-01-11
CZ291287B6 (cs) 2003-01-15
EP0882180B1 (fr) 2002-10-23
RU2177559C2 (ru) 2001-12-27
HUP9901494A3 (en) 2000-03-28
CZ189898A3 (cs) 1999-01-13
JP2000504388A (ja) 2000-04-11
SK284424B6 (sk) 2005-04-01
CN1207157A (zh) 1999-02-03
HUP9901494A2 (hu) 1999-08-30
HU220411B (hu) 2002-01-28

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