EP1339979A1 - Procede permettant de projeter du carburant hors du volume d'une soupape d'injection de carburant - Google Patents

Procede permettant de projeter du carburant hors du volume d'une soupape d'injection de carburant

Info

Publication number
EP1339979A1
EP1339979A1 EP01995553A EP01995553A EP1339979A1 EP 1339979 A1 EP1339979 A1 EP 1339979A1 EP 01995553 A EP01995553 A EP 01995553A EP 01995553 A EP01995553 A EP 01995553A EP 1339979 A1 EP1339979 A1 EP 1339979A1
Authority
EP
European Patent Office
Prior art keywords
fuel
valve
fuel injection
volume
injection valve
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Withdrawn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
EP01995553A
Other languages
German (de)
English (en)
Inventor
Guenter Dantes
Detlef Nowak
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 EP1339979A1 publication Critical patent/EP1339979A1/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Withdrawn legal-status Critical Current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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/047—Injectors peculiar thereto injectors with air chambers, e.g. communicating with atmosphere for aerating the nozzles
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • 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
    • F02M67/00—Apparatus in which fuel-injection is effected by means of high-pressure gas, the gas carrying the fuel into working cylinders of the engine, e.g. air-injection type
    • F02M67/06—Apparatus in which fuel-injection is effected by means of high-pressure gas, the gas carrying the fuel into working cylinders of the engine, e.g. air-injection type the gas being other than air, e.g. steam, combustion gas
    • 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
    • F02M67/00—Apparatus in which fuel-injection is effected by means of high-pressure gas, the gas carrying the fuel into working cylinders of the engine, e.g. air-injection type
    • F02M67/10—Injectors peculiar thereto, e.g. valve less type
    • F02M67/12—Injectors peculiar thereto, e.g. valve less type having valves
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F02M69/045—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the combustion chamber
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/08—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by the fuel being carried by compressed air into main stream of combustion-air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/12—Other methods of operation
    • F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a method for blowing out fuel from a fuel injection valve according to the preamble of the main claim.
  • Methods for spraying fuel into an intake pipe of a fuel injection system, in which the atomization of the fuel is supported by blowing in air, are known, as are the so-called air-enclosed fuel injection valves required for this.
  • air is blown into the fuel jet when the fuel is sprayed off in order to atomize it better.
  • a fuel injector which is fixed in a Ventilaufn hme, in which an annular channel is supplied with gas through gas supply channels, which opens into a mixing chamber downstream of the spray opening of the fuel injector.
  • fuel emerges from the spraying opening of the fuel injector, which is also used for metering.
  • the fanning out fuel jet is interspersed with air from the ring channel, so that improved atomization begins. The so generated
  • the fuel-air mixture is routed to the individual cylinders of the internal combustion engine via distribution bores.
  • a fuel injection valve is also known, at the downstream end of which an attachment body is arranged, which is mounted together with the fuel injection valve in a valve seat.
  • the valve receptacle can be part of an intake pipe, for example. Downstream of the spray openings of the fuel injection valve, spray channels for guiding the sprayed fuel are introduced in the attachment body.
  • a volume is formed between the attachment body and the valve seat, which volume is connected to a gas inlet channel located in the intake pipe.
  • the gas supplied to the annular volume through the gas inlet channel flows through cross bores almost at right angles into the spraying channels through which the fuel emerging from the spray openings of the fuel injector flows.
  • the intersection of the cross bores in the spray ducts is arranged approximately halfway through the flow path.
  • exhaust gas can also be taken from an exhaust gas recirculation system as the gas to be supplied. If the pressure conditions are insufficient to convey the gas to be supplied, a feed pump can also be provided.
  • a method for deflecting the fuel sprayed from the fuel injector in several partial jets is also known from DE 195 19 838 AI.
  • the fuel injection valve has a perforated plate at its downstream end, in which a plurality of spray openings are made.
  • the fuel to be sprayed is divided into several fuel jets through these multiple spray openings.
  • At the downstream end is a gas guiding part is placed on the fuel injector.
  • Fuel injector and gas supply part are used together in a valve receptacle, for example an intake pipe.
  • the fuel sprayed off by the fuel injection valve flows through a widening recess in the gas guide part, into which a gaseous substance can be blown in radially from the outside through a transverse bore.
  • the transverse bore is supplied with a gaseous medium through a gas supply channel which is arranged in the intake pipe.
  • the direction of flow of the gas stream supplied through the transverse bore is approximately perpendicular to the direction of flow of the sprayed fuel. This leads to a change in the direction of propagation of a partial fuel jet.
  • All specified fuel injection systems use a gaseous medium in order to be able to atomize the fuel jet emerging from a fuel injection valve more easily.
  • a gaseous medium is fed into the fuel jet downstream of the spray openings, which are used to meter the fuel to be sprayed.
  • a residual amount of fuel remains upstream of the spray openings, which is no longer sprayed after the fuel injection valve is closed.
  • the fuel in this volume formed downstream of the sealing seat can evaporate due to heat from the spray openings after the end of the spraying process. This is particularly disadvantageous when the injection valves are used in direct-injection, spark-ignited internal combustion engines, since the supply of fuel to the combustion chamber in a timely manner leads to a considerable increase in harmful gas emissions.
  • the use of the specified fuel injection valves is also made more difficult due to the required installation space, which is created by using a front sleeve on the fuel injection valve.
  • the goal of direct-injection internal combustion engines is to reduce fuel consumption. Fuel that emerges from a dead volume of the fuel injection valve after the actual combustion cannot contribute to combustion performance, but increases consumption. The use of the specified fuel injection valves in a direct injection internal combustion engine is therefore excluded.
  • the method for blowing out fuel from a volume of a fuel injector with the features of the main claim has the advantage that downstream of the sealing seat of the fuel injector all remaining fuel is expelled after the end of the injection. An uncontrolled supply of fuel at a late point in time of combustion can thus be prevented. As a result, the pollutant emissions are significantly reduced and the consumption of the internal combustion engine is also reduced. It is also advantageous that the fuel injection valve is dried at the downstream end by blowing out the fuel, as a result of which the tendency to coke is significantly reduced.
  • the timely supply of the gaseous medium in relation to the spraying process after the end of the spraying process has the advantage that, for example, the formation of a swirl in the fuel flow can take place without the influence of a disturbance variable.
  • the amount of gas supplied does not interfere with the actual spraying process and can therefore be optimized for blowing out the remaining fuel with subsequent drying of the fuel injector.
  • Another advantage arises in the design of the fuel injector taking into account a continuously supplied gaseous medium.
  • the fuel to be sprayed is already mixed with the gaseous medium supplied during the spraying process, which improves atomization. After the fuel injector has been closed, the gas quantity which is still continuously delivered ensures that the residual fuel is expelled and the downstream fuel injector part is subsequently dried.
  • the arrangement of a check valve in the gas supply line enables use in direct-injection internal combustion engines.
  • the combustion pressure built up in the combustion chamber during the combustion process cannot strike back into the gas supply line against the direction of flow of the gas to be supplied.
  • a high temperature load due to the hot combustion gases is also prevented.
  • Another advantage is the possibility of using exhaust gas from an exhaust gas recirculation system as a gaseous medium.
  • Figure 1 is a schematic representation of an internal combustion engine including the control of the fresh air supplied.
  • Figure 2 is a schematic representation of an internal combustion engine including the control of the supplied exhaust gas.
  • FIG 3 shows an exemplary embodiment of a fuel injection valve for blowing out fuel from a volume
  • Fig. 4 shows a second embodiment of a fuel injection valve including gas supply for blowing out fuel.
  • the internal combustion engine 10 has a cylinder head 31, in which a fuel injection valve 1 is arranged, through which the fuel to be burned is injected into a combustion chamber of the internal combustion engine 10.
  • the oxygen-containing fresh air required for combustion is drawn into the combustion chamber through an intake duct 13 via intake valves arranged in the cylinder head 31.
  • the combustion of the combustible mixture consisting of fuel and fresh air is initiated by a spark plug 15, which is also arranged in the cylinder head 31.
  • the combustion products flow through an open exhaust valve into an exhaust manifold 12 which is also mounted on the cylinder head 31. From there, the exhaust gases continue to reach the exhaust system, which contains, for example, a catalytic converter and silencer, not shown.
  • the fuel to be sprayed is removed from a fuel reservoir (not shown), from where it is fed to a fuel pump 28, for example, by a pre-feed pump.
  • the fuel pump 28 generates the pressure required to inject the fuel into the combustion chamber and conveys the fuel to the fuel injector 1 via a fuel line 10b. Excess fuel can be returned via a return line 11.
  • a plurality of fuel injection valves 1 can also be supplied via a common line, a so-called "common rail".
  • an electromagnet is excited via an electrical current that can be supplied via a plug contact 20.
  • exhaust gas is fed to an exhaust gas recirculation valve 26 which is connected via a line 17 to the intake duct 13.
  • the amount of exhaust gas recirculated depends on various parameters that characterize the operating state of the internal combustion engine. These include, for example, the temperature, the speed and the load. These parameters are detected by sensors, not shown, and transmitted to a control unit 14.
  • the electrical components which are controlled by the control device 14 are connected to the control device 14 by a cable harness 19.
  • a gaseous medium for blowing fuel out of a volume of the fuel injection valve 1 is fed to the fuel injection valve 1 via a gas supply line 25.
  • Fig. 1 shows the supply of fresh air from the intake duct 13 as a gaseous medium, the supply of fresh air by a pump Device 27, which is driven by the fuel pump 28, is supported.
  • Arranged in the gas supply line 25 is, for example, an electrically lockable switching valve 29 through which the supply of fresh air to the fuel injection valve 1 can be interrupted.
  • the switching valve 29 also receives the control signal from the control unit 14 via the wire harness 19.
  • a gas pressure is created in the gas supply line 25 by the pump device 27 continuously driven by the fuel pump 28.
  • the switching valve 29 is opened and the pressurized gas flows to the fuel injection valve 1. After the remaining fuel in the fuel injection valve 1 has been blown out, the switching valve 29 is closed again.
  • FIG. 2 shows a second exemplary embodiment of the method according to the invention.
  • the description is not repeated.
  • the gaseous medium which is to be fed to the fuel injection valve 1 is removed in FIG. 2 via an exhaust gas recirculation valve 26.
  • the exhaust gas recirculation valve 26 has a second outlet-side connection, to which the gas supply line 25 is connected.
  • An electrically switchable switching valve 29 is installed in the flow path of the exhaust gas to the fuel injection valve 1 and is connected to the control unit 14 via part of the cable harness 19. As in the first embodiment, the switching valve 29 is actuated after the end of the spraying process, so that the flow path through the gas supply line 25 is open. Due to the use of exhaust gas from the exhaust gas recirculation system, there is a limited pressure to convey the gaseous medium to the fuel injector 1 available. A pump device, not shown, can also generate an increased pressure, which leads to an improvement in the blow-out.
  • FIG. 3 shows the end of a fuel injection valve 1 on the injection side, on the basis of which the method of operation of the method is to be explained.
  • the fuel injector 1 has a nozzle body 2, at the downstream end of which a valve seat body 5 e.g. is attached by means of a weld 8.
  • a valve seat surface 6 is introduced into the valve seat body 5, to which at least one spray opening 7 is connected downstream.
  • a valve needle 3 is acted upon by a spring (not shown) in such a way that a valve closing body 4, which is in operative connection with the valve needle 3, is held in sealing contact with the valve seat surface 6.
  • the fuel flows through fuel channels, which are arranged in a guide disk 32 and a swirl disk 33, to the valve seat surface 6 and the valve closing body 4 and further to the spray opening 7, from where it is sprayed into a combustion chamber.
  • the fuel injection valve 1 is sealed off from the cylinder head 31, which is partially shown, by means of a seal 18 attached to the nozzle body 2.
  • a blow-out channel 23 which can be designed, for example, as a bore, opens into the spray opening 7, preferably immediately downstream of the sealing seat Spray opening 7 connects to a circumferential annular channel 30 introduced in the cylinder head 31.
  • the gas removed from the intake duct 13 or the exhaust gas recirculation system is supplied to the ring duct 30 via the gas supply line 25, which can be introduced into the cylinder head 31.
  • a check valve 24 is arranged in the gas supply line 25 in order to prevent the combustion chamber pressure from receding into the gas supply line 25. Alternatively, the check valve 24 can also be arranged in the blow-out channel 23.
  • the fuel injection valve 1 closes at the end of the spraying process by pressing the valve closing body 4 onto the valve seat surface 6 by means of the spring force, fuel remains in the spraying opening 7. Due to the task of the spray opening 7 to deflect the fuel jet, a minimum length for the spray opening 7 is necessary.
  • the thereby relatively large volume 22, which is filled with fuel, is blown out of the spray opening 7 by the gaseous medium which is supplied through the blow-out duct 23.
  • the supply of the gaseous medium can be coordinated in time by a switching valve 29.
  • the gaseous medium flowing through the spray opening 7 dries the spray opening 7 after expelling the remaining fuel and thus prevents the spray opening 7 from coking due to the combustion.
  • the fuel can participate in the combustion by specifically blowing out the remaining fuel from the volume 22. An increase in the harmful gas emission and an additional consumption due to late evaporation of fuel from the spray opening 7 is thus prevented.
  • the blowing out of fuel from a volume 22 is particularly important in a fuel injection valve 1, which is shown as a second exemplary embodiment in FIG. 4.
  • a swirl-generating element 21 is arranged downstream of the valve seat body 5, which in turn forms a sealing seat with a valve closing body 4.
  • the swirl-generating element 21 inclined against the central axis of the fuel injection valve 1 has a large volume 22 which is formed between the swirl-generating element 21 and the valve seat body 5.
  • a blow-out duct 23 connects a circumferential annular groove 30 of the cylinder head 31 to the volume 22 downstream of the sealing seat.
  • the gaseous medium can also be supplied continuously.
  • the switching valve 29 arranged in the gas supply line 25 can then be omitted. If the combustion chamber pressure is lower than the pressure in the gas supply line 25, the gaseous medium is supplied through the blow-out channel 23. If the combustion chamber pressure exceeds the pressure in the gas supply line 25, the check valve 24 closes and there is no pressure loss due to the outflow of combustible fuel / air mixture from the combustion chamber.

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

Procédé permettant de projeter du carburant hors du volume (22) d'une soupape (1) d'injection de carburant pour des systèmes d'injection de carburant de moteurs à combustion interne (10). Ladite soupape (1) possède un obturateur (4) qui se trouve en coopération avec une aiguille (3) et qui coopère avec une surface (6) de siège de soupape pour former une obturation étanche en aval de laquelle est formé le volume (22). Ledit procédé possède les étapes suivantes : fermeture de la soupape (1) d'injection de carburant, introduction d'un milieu gazeux dans le volume (22) et projection du carburant présent dans le volume (22), la partie aval de la soupape (1) d'injection de carburant étant séchée par le milieu gazeux introduit.
EP01995553A 2000-12-01 2001-11-30 Procede permettant de projeter du carburant hors du volume d'une soupape d'injection de carburant Withdrawn EP1339979A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10059681A DE10059681A1 (de) 2000-12-01 2000-12-01 Verfahren zum Ausblasen von Brennstoff aus einem Volumen eines Brennstoffeinspritzventils
DE10059681 2000-12-01
PCT/DE2001/004507 WO2002044554A1 (fr) 2000-12-01 2001-11-30 Procede permettant de projeter du carburant hors du volume d'une soupape d'injection de carburant

Publications (1)

Publication Number Publication Date
EP1339979A1 true EP1339979A1 (fr) 2003-09-03

Family

ID=7665384

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01995553A Withdrawn EP1339979A1 (fr) 2000-12-01 2001-11-30 Procede permettant de projeter du carburant hors du volume d'une soupape d'injection de carburant

Country Status (3)

Country Link
EP (1) EP1339979A1 (fr)
DE (1) DE10059681A1 (fr)
WO (1) WO2002044554A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10328165A1 (de) * 2003-06-24 2005-01-13 Daimlerchrysler Ag Verfahren zum Betrieb einer fremdgezündeten Brennkraftmaschine
FR2859764B1 (fr) * 2003-09-12 2006-01-06 Renault Sa Moteur thermique a injection directe de gaz brules recycles.
DE102004016811A1 (de) * 2004-04-06 2005-10-27 Klaus Dipl.-Ing. Sander Verfahren für eine homogene Gemischbildung zur Kraftstoffverbrennung in Verbrennungskraftmaschinen

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
JPH025753A (ja) * 1988-06-23 1990-01-10 Aisan Ind Co Ltd 燃料噴射弁とそのノズル
DE4005734A1 (de) 1990-02-23 1991-08-29 Bosch Gmbh Robert Vorrichtung zur einspritzung eines brennstoff-gas-gemisches
US5129381A (en) * 1990-06-18 1992-07-14 Nissan Motor Co., Ltd. Fuel injection system for internal combustion engine
US5526796A (en) * 1994-06-01 1996-06-18 Southwest Research Institute Air assisted fuel injector with timed air pulsing
DE4432076A1 (de) 1994-09-09 1996-03-14 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19519838C2 (de) 1995-05-31 1997-11-20 Bosch Gmbh Robert Verfahren zur Beeinflussung der Ausrichtung von Brennstoff an einem Brennstoffeinspritzventil und Brennstoffeinspritzventil
DE19529375A1 (de) * 1995-08-10 1997-02-13 Bosch Gmbh Robert Brennstoffeinspritzventil
DE19728816A1 (de) * 1997-07-05 1999-01-07 Porsche Ag Vorrichtung zur luftunterstützten Kraftstoffeinspritzung in ein Saugrohr einer Brennkraftmaschine

Non-Patent Citations (1)

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Title
See references of WO0244554A1 *

Also Published As

Publication number Publication date
WO2002044554A1 (fr) 2002-06-06
DE10059681A1 (de) 2002-06-06

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