WO2005108767A1 - Moteur a combustion interne suralimente comprenant un dispositif d'injection - Google Patents

Moteur a combustion interne suralimente comprenant un dispositif d'injection Download PDF

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Publication number
WO2005108767A1
WO2005108767A1 PCT/EP2005/004529 EP2005004529W WO2005108767A1 WO 2005108767 A1 WO2005108767 A1 WO 2005108767A1 EP 2005004529 W EP2005004529 W EP 2005004529W WO 2005108767 A1 WO2005108767 A1 WO 2005108767A1
Authority
WO
WIPO (PCT)
Prior art keywords
internal combustion
fuel
combustion engine
inlet
injection valve
Prior art date
Application number
PCT/EP2005/004529
Other languages
German (de)
English (en)
Inventor
Helmut Gildein
Arnold Kaden
Original Assignee
Daimlerchrysler Ag
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 Daimlerchrysler Ag filed Critical Daimlerchrysler Ag
Publication of WO2005108767A1 publication Critical patent/WO2005108767A1/fr

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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
    • 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
    • F02M69/044—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the intake conduit downstream of an air throttle valve
    • 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
    • F02B33/00—Engines characterised by provision of pumps for charging or scavenging

Definitions

  • the invention relates to a supercharged internal combustion engine with an injection device according to the preamble of claim 1.
  • Supercharged internal combustion engines are known, in particular gasoline engines, which are equipped with an injection device in the form of a channel injection device.
  • An injection valve is provided in an inlet duct of the internal combustion engine. It has proven to be advantageous to provide mechanical charging in order to improve the motor behavior in connection with the channel injection device, in particular in the event of changes in load.
  • Mechanical charging is carried out in the form of a machine that works on the displacement principle.
  • the displacement machine is arranged in an intake tract and is mechanically driven by the internal combustion engine.
  • the intake tract includes, among other things, an inlet duct for each cylinder of the internal combustion engine.
  • An inlet opening in which an inlet valve is provided is assigned to the inlet channel.
  • the injection valve injects the fuel in the direction of the intake valve.
  • DE 40 24 841 AI discloses a heatable inlet valve.
  • a heating element is integrated in a valve plate of the inlet valve, which is connected to a heating device via elaborately laid electrical lines. It will also be heating stationary components in the area of the inlet valve, such as a valve seat ring, proposed.
  • the object of the invention is to provide an internal combustion engine of the type mentioned at the beginning, the pollutant emissions of which can be reduced in the cold start and in the warm-up phase without additional devices.
  • the internal combustion engine according to the invention is characterized by inlet valves which are positioned in the closed position when the fuel jets strike and the injected fuel is emitted from the correspondingly arranged, single injection valve such that the surface of the inlet valves facing the inlet channel and available in the closed position is substantially completely wetted with fuel is.
  • the internal combustion engine has a mechanical supercharger in the form of a displacement machine which is arranged in an intake tract of the internal combustion engine.
  • the intake tract has one inlet channel per cylinder of the internal combustion engine.
  • An injection valve is provided in the inlet duct.
  • Two inlet openings are assigned to the inlet channel, in which inlet valves are provided.
  • the inlet openings are separated from one another by a partition in the inlet channel, so that each inlet opening is arranged in a sub-channel of the inlet channel.
  • the displacement machine is mechanically driven by the internal combustion engine and conveys the compressed fresh air into the inlet duct.
  • the Injector injects a conically divergent fuel jet in the direction of the intake valves.
  • the fuel jets are aligned and shaped such that at least the surface of the inlet valves facing the inlet duct is wetted with fuel in the cold start and in the warm-up phase.
  • the inlet valves are positioned in their closed position when the fuel jets strike.
  • the injected fuel spreads on the surface of the intake valve and forms a fuel film with a smaller thickness on the surface of the intake valve than with an injection with a small cone angle.
  • the fuel film evaporates faster from the larger surface.
  • the vaporized fuel mixes with the fresh air and forms a fuel-air mixture in the subchannels.
  • the droplet formation caused by undamped fuel is prevented, which is reflected in greatly reduced HC emissions.
  • the advantages of channel injection in connection with mechanical charging remain unchanged.
  • the injection valve is arranged symmetrically to the inlet valves.
  • Siamese intake ducts the subchannels of which are arranged mirror-inverted to a longitudinal axis of the intake duct or to a transverse engine axis, there is the advantage that fuel jets that are simultaneously sprayed off simultaneously serve the intake valves of an intake duct to reach. This makes mixture formation and combustion reproducible.
  • the injection valve is arranged between 50 mm and 70 mm away from the inlet valves. Due to the arrangement of the injection valve close to the intake valve, the injected fuel quantity can be metered more precisely, since the short distance means there are hardly any influences from the flow of fresh air on the fuel jets.
  • the injection valve has an installation angle ⁇ E of 29 ° to a vertical.
  • the injection valve is provided in an opening in a sealing manner in an upper wall section of the inlet channel. At least one injection nozzle protrudes into the inlet channel.
  • the choice of the acute installation angle of the injection valve relative to the inlet duct and the vertical makes it possible to optimize the installation space with regard to the seal and the installation space of the injection valve.
  • the fuel jets have a bending angle ⁇ B of 17 °.
  • the direction of the sprayed fuel jets differs from a longitudinal axis of the injection valve.
  • the fuel jets are inclined upwards 17 ° to the longitudinal axis or to the cylinder head. An inclination of the fuel jets advantageously results in more degrees of freedom for the arrangement of the injection valve.
  • the fuel jets have a split angle ⁇ s between 40 ° and 50 ° to one another.
  • the injector squirts two from each other separate fuel jets. Adhesion of fuel to the partition can advantageously be avoided by two separate fuel jets.
  • the fuel jets have a cone angle ⁇ ⁇ between 20 ° and 25 °. Due to the large cone angle, a larger surface area of the inlet valves can be wetted with fuel by the conically divergent fuel jets.
  • FIG. 1 shows a schematically simplified representation of an inlet duct in a side view of the internal combustion engine according to the invention
  • FIG. 2 shows a schematically simplified representation of the inlet duct in a top view of the internal combustion engine according to the invention
  • the supercharged internal combustion engine according to the invention with an injection device has an intake tract and an exhaust tract.
  • a mechanical loader in the form of a displacement machine is provided in the intake tract.
  • the displacement machine is mechanically driven by the internal combustion engine by means of a belt drive.
  • Displacement machine is connected to intake ducts of the internal combustion engine via a suction pipe. There is an intake port and an exhaust port for each cylinder of the internal combustion engine intended.
  • the exhaust ducts form the exhaust tract with an exhaust manifold and an exhaust system connected to it.
  • FIG. 1 and FIG. 2 show an intake port 1 and an exhaust port 2 for a cylinder 3 of the internal combustion engine, which are provided in a cylinder head 4 of the internal combustion engine, which is not detailed.
  • the intake manifold 6 merges into the inlet duct 1.
  • the inlet duct 1 ends at the inlet openings 7 and 8, which lead into a combustion chamber 9.
  • inlet valves 10, 11 are provided which, in a known manner, via a valve (not shown in detail)
  • Valve actuation mechanism can open and close the inlet openings 7, 8.
  • the inlet valves 10, 11 preferably have an installation angle ⁇ v of 23 ° with respect to a horizontal 12.
  • the horizontal line 12 represents a separating surface between the cylinder head 4 and an engine block 13 of the internal combustion engine, which is not detailed.
  • the inlet openings 7, 8 are separated from one another by a partition 14 in the inlet channel 1.
  • two subchannels 15 and 16 are formed.
  • the subchannels 15, 16 are arranged symmetrically and mirror-inverted to one another with respect to a longitudinal axis of the inlet duct or to a transverse engine axis 17.
  • the outlet channel 2 is constructed in accordance with the inlet channel 1 and is not explained in more detail.
  • the injector 18 is preferably designed as an electromagnetic injection valve and has an electrical connection, not shown, and a fuel supply, not shown.
  • the injection valve 18 has an installation angle ⁇ E of 29 ° measured relative to a vertical 22.
  • the injection nozzle 21 of the injection valve 18 is between 50 mm and 70 mm, preferably 60 mm, from the inlet valves 10, 11 in their closed position.
  • Fuel jets 23, 24 leave the injection nozzle 21 at a bend angle ⁇ B of preferably 17 °.
  • the fuel jets 23, 24 are still inclined upward to a longitudinal axis 25 of the injection valve 18 or towards the cylinder head 4.
  • FIG. 2 shows the symmetrical arrangement of the injection valve 18 to the inlet openings 7, 8.
  • the fuel jets 23, 24 have a split angle ⁇ s of 40 ° to 50 ° to one another.
  • the fuel jets 23, 24 diverge conically from the injection nozzle 21 and have one
  • the parameters of the injection valve 18 and the fuel jets 23, 24 described above make it possible to reduce pollutant emissions in the cold start and in the warm-up phase without additional devices.
  • the displacement machine conveys compressed fresh air into the inlet channels 1 of the internal combustion engine.
  • the intake valves 10, 11 are positioned in their closed position.
  • the fuel jets 23, 24 strike the surfaces 26, 27 of the inlet valves 10, 11 facing the inlet channel 1, so that the surface 26, 27 available in the closed position of the inlet valves 10, 11 is essentially completely fueled are wetted.
  • a fuel film with a smaller thickness is formed on the entire available surfaces 26, 27 of the intake valves 10, 11 than when the fuel is injected onto only one partial surface of the surface 26, 27 of the intake valves 10, 11
  • the area and the small thickness of the fuel film rapidly evaporate from the surface 26, 27 of the intake valves 10, 11.
  • the amount of the unevaporated fuel decreases significantly and the amount of the evaporated fuel, which can form a fuel-air mixture with the pre-compressed fresh air in the inlet duct 1, increases accordingly.
  • the injection of fuel onto the intake valves 10, 11 positioned in the closed position has a supporting effect on the evaporation of the fuel, since, in contrast to an injection onto open intake valves, the fuel does not get into the combustion chamber 9 as unevaporated fuel before it has completely evaporated.
  • the injection of fuel onto the inlet valves 10, 11 positioned in the closed position leads to a pre-storage of a fuel-air mixture in the subchannels 15, 16. This enables considerable advantages in engine behavior, in particular in the event of load changes.
  • the significantly smaller amount of unevaporated fuel that enters combustion chamber 9 when intake valves 10, 11 are opened leads to a drastic reduction in pollutant emissions, in particular HC emissions.
  • the amount of fuel injected can be reduced due to the more effective evaporation of the injected fuel.
  • the intake valves 10, 11 heat up very quickly and very strongly, particularly in supercharged internal combustion engines. With the rapid heating of the intake valves 10, 11, the amount of fuel injected can be further reduced in the cold start and warm-up phase, since the proportion of the undevaporated fuel continues to decrease drastically.
  • the optimized injection provides effective internal cooling when the internal combustion engine is at operating temperature. Due to the optimally distributed fuel, the strongly heated inlet valves 10, 11 can be cooled better on their surfaces 25, 26 than in the case of an injection onto a partial surface of the surfaces 26, 27. This means that cooled inlet valves can be dispensed with.

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

Abstract

Les moteurs à combustion interne de l'état de la technique possèdent une suralimentation en air frais d'aspiration et un dispositif d'injection. La présente invention concerne un moteur à combustion interne qui présente une suralimentation mécanique et un dispositif d'injection canalisé. Les soupapes d'admission (10, 11) se trouvent en position de fermeture lors du contact avec les jets de carburant (23, 24), et le carburant injecté humidifie au moins les surfaces (26, 27) des soupapes d'admission (10, 11), qui sont opposées au canal d'admission (1). Le moteur à combustion interne de l'invention est de préférence un moteur à allumage commandé destiné à des applications dans des voitures particulières.
PCT/EP2005/004529 2004-05-06 2005-04-28 Moteur a combustion interne suralimente comprenant un dispositif d'injection WO2005108767A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004022323.8 2004-05-06
DE200410022323 DE102004022323A1 (de) 2004-05-06 2004-05-06 Aufgeladene Brennkraftmaschine mit einer Einspritzvorrichtung

Publications (1)

Publication Number Publication Date
WO2005108767A1 true WO2005108767A1 (fr) 2005-11-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/004529 WO2005108767A1 (fr) 2004-05-06 2005-04-28 Moteur a combustion interne suralimente comprenant un dispositif d'injection

Country Status (2)

Country Link
DE (1) DE102004022323A1 (fr)
WO (1) WO2005108767A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4024841A1 (de) * 1990-08-04 1992-02-06 Richard Van Basshuysen Brennkraftmaschine
US5113833A (en) * 1989-06-19 1992-05-19 Hitachi, Ltd. Method and controller for supplying fuel to cylinders of multicylinder internal combustion engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5113833A (en) * 1989-06-19 1992-05-19 Hitachi, Ltd. Method and controller for supplying fuel to cylinders of multicylinder internal combustion engine
DE4024841A1 (de) * 1990-08-04 1992-02-06 Richard Van Basshuysen Brennkraftmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
FORTNAGEL ET AL.: "Technischer Fortschritt durch Evolution - Neue Vierzylinder-Ottomotoren von Mercedes-Benz auf Basis des erfolgreichen MIII", MTZ MOTORTECHNISCHE ZEITSCHRIFT, vol. 61, no. 7/8, 2000, pages 458 - 464, XP002336809 *

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DE102004022323A1 (de) 2005-11-24

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