EP1458970B1 - Dispositif d'injection de carburant pour moteurs a combustion interne - Google Patents

Dispositif d'injection de carburant pour moteurs a combustion interne Download PDF

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Publication number
EP1458970B1
EP1458970B1 EP02796496A EP02796496A EP1458970B1 EP 1458970 B1 EP1458970 B1 EP 1458970B1 EP 02796496 A EP02796496 A EP 02796496A EP 02796496 A EP02796496 A EP 02796496A EP 1458970 B1 EP1458970 B1 EP 1458970B1
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EP
European Patent Office
Prior art keywords
pressure
pressure chamber
control
injection
fuel
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.)
Expired - Lifetime
Application number
EP02796496A
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German (de)
English (en)
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EP1458970A1 (fr
Inventor
Thomas Kuegler
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
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Robert Bosch GmbH
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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
    • 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
    • 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
    • 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
    • F02M45/086—Having more than one injection-valve controlling discharge orifices
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/023—Injectors structurally combined with fuel-injection pumps characterised by the pump drive mechanical
    • 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
    • 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
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • F02M59/468—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means using piezoelectric operating means
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies

Definitions

  • the invention relates to a fuel injection device for an internal combustion engine according to the preamble of claim 1.
  • Such a fuel injection device is characterized by the DE 198 35 494 A1 or the US 4976 245A1 known.
  • This fuel injection device has a high-pressure fuel pump and a fuel injection valve connected thereto for each cylinder of the internal combustion engine.
  • the high-pressure fuel pump has a pump piston driven by the internal combustion engine in a lifting movement, which limits a pump working space, which is connected to a pressure chamber of the fuel injection valve.
  • the fuel injection valve has an injection valve member, by which at least one injection opening is controlled and which is acted upon by the pressure prevailing in the pressure chamber against a closing force in an opening direction for releasing the at least one injection opening.
  • a connection of the pump working chamber to a discharge space is controlled at least indirectly to control the fuel injection.
  • the pressure in the pump working chamber and thus in the pressure chamber of the fuel injection valve reaches the opening pressure, so the injection valve member moves in the opening direction and releases the at least one injection port.
  • the injection cross section, which is controlled by the injection valve member thereby is always the same size. This does not allow optimum fuel injection under all operating conditions of the internal combustion engine.
  • the fuel injection device according to the invention with the features of claim 1 has the advantage that can be released or closed by the second injection valve member with the at least one second injection port additional injection cross section, so that the injection cross section can be optimally adapted to the operating conditions of the internal combustion engine.
  • the control of the injection cross section is carried out in a simple manner by the variable pressure in the control pressure chamber.
  • the embodiment according to claim 5 allows a substantial pressure equalization at the control valve member.
  • the embodiment of claim 8 allows easy generation of the pressure in the control pressure chamber.
  • the embodiment according to claim 11 enables an optimal adaptation of the injection cross section to the load and / or speed of the internal combustion engine.
  • the embodiment according to claim 12 allows combustion with low noise and pollutant emission of the internal combustion engine.
  • FIG. 1 a fuel injection device for an internal combustion engine in a schematic representation in a longitudinal section
  • FIG. 2 in an enlarged view a in FIG. 1 II section of the fuel injection device
  • FIG. 3 in an enlarged view a in FIG. 1 labeled III section of the fuel injector
  • FIG. 4 Strokes of injection valve members of the fuel injector over time during an injection cycle.
  • the internal combustion engine is preferably a self-igniting internal combustion engine.
  • the fuel injection device is designed as a so-called pump-nozzle system or as a pump-line-nozzle system and has for each cylinder of the internal combustion engine in each case a high-pressure fuel pump 10 and connected thereto fuel injection valve 12.
  • the high-pressure fuel pump 10 is disposed away from the fuel injection valve 12 and connected thereto via a line.
  • the fuel injector is formed as a pump-nozzle system, wherein the high-pressure fuel pump 10 and the fuel injection valve 12 are directly connected to each other and form a structural unit.
  • the high-pressure fuel pump 10 has a tightly guided in a cylinder bore 16 in a pump body 14
  • Pump piston 18 which is driven by a cam 20 of a camshaft of the internal combustion engine against the force of a return spring 19 in a lifting movement.
  • the pump piston 18 defines in the cylinder 16 a pump working chamber 22 in which the delivery stroke of the pump piston 18 compresses fuel under high pressure.
  • the pump working chamber 22 is supplied with fuel from a fuel tank 24 of the motor vehicle during the suction stroke of the pump piston 18 in a manner not shown.
  • the fuel injection valve 12 has, as in the FIGS. 1 and 3 illustrate a valve body 26 which may be formed in several parts, in which a first injection valve member 28 is guided longitudinally displaceably in a bore 30.
  • the valve body 26 at its the combustion chamber of the cylinder of the internal combustion engine end portion facing at least a first, preferably a plurality of first injection ports 32 which are arranged distributed over the circumference of the valve body 26.
  • the first injection valve member 28 has, at its end region facing the combustion chamber, an approximately conical sealing surface 34, for example, which cooperates with a valve seat 36 formed in the valve body 26 in its end region facing the combustion chamber, from or after which the first injection openings 32 are discharged.
  • annular space 38 is present between the injection valve member 28 and the bore 30 toward the valve seat 36, which merges in its end region remote from the valve seat 36 by a radial widening of the bore 30 into a pressure chamber 40 surrounding the first injection valve member 28.
  • the first injection valve member 28 has at the level of the pressure chamber 40 by a cross-sectional reduction on a pressure shoulder 42.
  • a first biased closing spring 44 At the end remote from the combustion chamber of the first injection valve member 28 engages a first biased closing spring 44, through which the first Injection valve member 28 is pressed to the valve seat 36 back.
  • the first closing spring 44 is arranged in a spring chamber 46 of the valve body 26, which adjoins the bore 30.
  • the first injection valve member 28 of the fuel injection valve 12 is hollow and in this a second injection valve member 128 is slidably guided in a bore formed coaxially in the injection valve member 28.
  • a second injection valve member 128 is slidably guided in a bore formed coaxially in the injection valve member 28.
  • the second injection valve member 128, at least one second injection port 132 in the valve body 26 is controlled.
  • the at least one second injection opening 132 is arranged offset in the direction of the longitudinal axis of the injection valve members 28, 128 to the at least one first injection opening 32 toward the combustion chamber.
  • the second injection valve member 128 has, at its end region facing the combustion chamber, an approximately conical sealing surface 134, for example, which cooperates with a valve seat 136 formed in the valve body 26 in its end region facing the combustion chamber, from or after which the second injection openings 132 are discharged.
  • the second injection valve member 128 may be formed in two parts and having a sealing surface 134, the combustion chamber facing part and a combustion chamber adjacent to the first part second part. Near the combustion chamber end of the second injection valve member 128, a pressure surface 142 is formed on this, acts on the pressure prevailing in the pressure chamber 40 when the first injection valve member 28 is open.
  • a control pressure chamber 60 is formed in which a second, acting on the second injection valve member 128 closing spring 144 is arranged.
  • the control pressure chamber 60 is slightly smaller in diameter than the spring chamber 46.
  • the first Injection valve member 28 protrudes with its end into the spring chamber 46 and is supported on the first closing spring 44.
  • the first closing spring 44 is supported with its end remote from the first injection valve member 28 at a sleeve 47 arranged between the spring chamber 46 and the control pressure chamber 60.
  • the sleeve 47 in turn is supported on an annular shoulder formed at the transition from the spring chamber 46 to the control pressure chamber 60 by the diameter reduction.
  • the sleeve 47 may be pressed into the spring chamber 46 and thus fixed or may alternatively be displaceable in the spring chamber 46 in the direction of the longitudinal axis of the first injection valve member 28.
  • the second injection valve member 128 protrudes through the sleeve 47 into the control pressure chamber 60 and is supported on a control piston 62 delimiting the control pressure chamber 60 toward the spring chamber 46.
  • the second closing spring 144 is supported with its end facing away from the control piston 62 at the bottom of the control pressure chamber 60.
  • the control pressure chamber 60 is supplied under pressure fuel, for example by means of a feed pump 64.
  • the feed pump 64 may also serve to promote during the suction stroke of the pump piston 18 fuel into the pump working chamber 22.
  • the pressure in the control pressure chamber 60 is variably set depending on operating conditions of the internal combustion engine, such as engine speed, load, temperature and others.
  • the feed pump 64 can be operated correspondingly with variable speed or it can be provided between the feed pump 64 and the control pressure chamber 60, a relief valve 66, by means of which the pressure in the control pressure chamber 60 is controlled by the relief valve 66 opens or closes a connection to a low pressure region ,
  • connection 48 in the pressure chamber 40 of the fuel injection valve 12.
  • the connection 48 is controlled by a control valve 70.
  • the control valve 70 has a in a subsequent to the control pressure chamber 60 bore 71 of the valve body 26 tightly guided piston-shaped control valve member 72.
  • the bore 71 has a formed by a radial extension, the control valve member 72 surrounding annular space 73 into which a leading to the pump working chamber 22 part of the connection 48 and a pressure chamber 40 leading part of the connection 48 opens.
  • a valve seat 74 is formed, with which the control valve member 72 cooperates with a sealing surface 76 formed on this.
  • the starting from the annular space 73 to the control pressure chamber 60 arranged portion 171 of the bore 71 has a slightly smaller diameter than the starting from the annular space 73 the control pressure chamber 60 facing away arranged portion 271 of the bore 71.
  • the control valve member 72 has accordingly in his in section 171 of the bore 71 guided portion 172 has a smaller diameter than in its guided in the section 271 of the bore 71 portion 272.
  • the sealing surface 76 is formed on the control valve member 72 at the junction between the two regions 172 and 272.
  • the control valve member 72 has a greatly reduced diameter portion 372 so that between the portion 372 of the control valve member 72 and the portion 171 of the bore 71, an annular space 77th is available.
  • the annular space 77 has a connection to a low-pressure region, which may be, for example, a return 78 into the fuel reservoir 24.
  • the spring chamber 46 is also connected to the return 78.
  • an actuator pressure chamber 80 is formed in the valve body 26 or the pump body 14 or between them, which is limited by the control valve member 72.
  • the control valve member 72 is thus acted upon by the pressure prevailing in the actuator pressure chamber 80 in the closing direction.
  • the control valve member 72 is of the pressure prevailing in the control pressure chamber 60 and also by a clamped between the control piston 62 and the control valve member 72 return spring 82.
  • the pressure in Aktordruckraum 80 is controlled by a piezoelectric actuator 84 which depends on an applied to this Voltage its extent, in particular changes its length and thereby changes the pressure in the actuator pressure chamber 80.
  • the actuator 84 is connected to an electronic control device 86 through which the voltage applied to the actuator 84 is provided.
  • the actuator 84 may be connected via a hydraulic coupler to the actuator pressure chamber 80 in order to reinforce a relatively small change in length of the actuator 84 and to be able to effect relatively large pressure changes in the actuator pressure chamber 80. If a high pressure prevails in the actuator pressure chamber 80, then the control valve member 72 is against the pressure prevailing in the control pressure chamber 60 and against the force of the return spring 82 in its closed position, so that the pump working chamber 22 is separated from the return line 78.
  • control valve member 72 If there is a slight pressure in the actuator pressure chamber 80, then the control valve member 72 is in its open position by the pressure prevailing in the control pressure chamber 60 and the return spring 82, so that the pump working chamber 22 is connected to the return line 78.
  • control device 86 and the feed pump 64 and the relief valve 66 is controlled to adjust the pressure prevailing in the control pressure chamber 60 pressure depending on operating conditions of the internal combustion engine.
  • a connection 88 is provided between the actuator pressure chamber 80 and the control pressure chamber 60, in which a check valve 90 which opens toward the actuator pressure chamber 80 is arranged.
  • the check valve 90 opens, so that the actuator pressure chamber 80 can be filled with fuel. If the pressure in the actuator pressure chamber 80 is higher than in the control pressure chamber 60, so the check valve 90 closes, so that the Aktordruckraum 80 is separated from the control pressure chamber 60.
  • the control valve member 72 When the suction stroke of the pump piston 18, the control valve member 72 is in its open position, wherein the annular space 77 has a connection with the feed pump 64, so that fuel from the fuel tank 24 passes into the pump working chamber 22.
  • the start of fuel injection is determined by moving the control valve member 72 to its closed position.
  • an increased voltage is applied to the actuator 84 by the control device 86, so that the pressure in the actuator pressure chamber 80 is increased and the control valve member 72 in its closed position arrives.
  • the pump working chamber 22 is then separated from the return line 78 and in this high pressure builds up according to the stroke of the pump piston 18.
  • the fuel injection valve 12 opens by the first injection valve member 28 lifts off with its sealing surface 34 from the valve seat 36 and the at least one first injection port 32 releases.
  • the closing force exerted by the pressure prevailing in the control pressure chamber 60, the second closing spring 144 and the return spring 82 on the control piston 62 and thus the second injection valve member 128 is greater than the pressure prevailing in the pressure chamber 40 Force exerted on the second injection valve member 128 via the pressure surface 142 so that the second injection valve member 128 remains in its closed position.
  • the fuel injection valve 12 therefore, only part of the total injection cross section is opened with the first injection openings 32, so that correspondingly only a small amount of fuel is injected.
  • the end of the fuel injection is determined by the control device 86, the voltage at the actuator 84 is reduced, whereby the pressure in the Aktordruckraum 80 is reduced, so that the control valve member 72 caused by the pressure prevailing in the control pressure chamber 60 and the force of the return spring 82nd moved to its open position.
  • the pump chamber 22 is then connected to the return line 78 and in this no high pressure can build up.
  • the first injection valve member 28 then closes due to the force of the first closing spring 44.
  • pressure surface 142 of the second injection valve member 128 is separated from the pressure chamber 40, so that the second injection valve member 128 due to Force of the second closing spring 144 closes.
  • a stroke stop for the second injection valve member 128 is arranged on the first injection valve member 28, through which the opening stroke of the second injection valve member 128 is limited.
  • the second injection valve member 128 may also open until it comes to rest on the stroke stop.
  • the first injection valve member 28 closes, the second injection valve member 128 is forcibly also closed via this stroke stop.
  • the injection cross sections formed by the first injection openings 32 and the second injection openings 132 are at least approximately equal, so that when opening only the first injection valve member 28 of half total Injection cross section is released.
  • the first injection openings 32 form a larger or smaller injection cross section than the second injection openings 132.
  • FIG. 4 the course of the opening stroke h for the first injection valve member 28 is shown in solid line and for the second injection valve member 128 in dashed line during an injection cycle over the time t.
  • the control valve member 72 is brought by setting a high pressure in the actuator pressure chamber 80 in its closed position, so that the pump working chamber 22 is separated from the return line 78.
  • a high pressure is set, so that at low delivery stroke of the pump piston 18 initially only the first injection valve member 28 opens and the fuel injection valve 12, only a portion of the entire injection cross section is released. There is then a pre-injection of a small amount of fuel only through the first injection ports 32.
  • the voltage at the actuator 84 is then reduced, so that the pressure in the actuator pressure chamber 80 decreases and the control valve member 72 assumes its open position, so that the pump working chamber 22 relieved is and the first injection valve member 28 closes and the fuel injection is interrupted. Subsequently, the voltage at the actuator 84 is increased by the control device 86, so that the control valve member 72 again assumes its closed position due to the increased pressure in the actuator pressure chamber 80.
  • the pressure in the control pressure chamber 60 can be reduced by the control device 86 so that the closing force is reduced to the second injection valve member 128 and in addition, the second injection valve member 128 opens, so that Fuel injection valve 12, the entire injection cross section is released and a main injection of a large amount of fuel takes place.
  • the pressure in the control pressure chamber 60 can be reduced by the control device 86 already at the beginning of the main injection, so that the second injection valve member 128 only after a short time delay after the first injection valve member 28 opens.
  • the pressure in the control pressure chamber 60 can also be opened by the control device 86 during the course of the main injection, so that the second injection valve member 128 opens with a larger time delay after the first injection valve member 28 as in FIG. 4 is shown. There is then a main injection of a large amount of fuel through the first injection ports 32 and the second injection ports 132nd
  • a high pressure is set, so that only the first injection valve member 28 opens and the second injection valve member 128 remains closed.
  • a high pressure can be set, so that only the first injection valve member 28 opens, and during the main injection, the pressure be reduced in the control pressure chamber 60 by the control device 86, so that in addition, the second injection valve member 128 opens.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (14)

  1. Installation d'injection de carburant pour un moteur à combustion interne comprenant une pompe haute pression de carburant (10) et un injecteur de carburant (12) relié à cette pompe, pour chaque cylindre du moteur à combustion interne,
    la pompe haute pression de carburant (10) comportant un piston de pompe (18) entraîné suivant un mouvement de translation par le moteur à combustion interne, ce piston délimitant une chambre de travail de pompe (22) reliée à une chambre de pression (40) de l'injecteur de carburant (12),
    l'injecteur de carburant (12) comportant au moins un premier organe d'injection (28) qui commande au moins un premier orifice d'injection (32) et est sollicité par la pression régnant dans la chambre de pression (40) contre la force de fermeture dans le sens de l'ouverture (29) pour libérer au moins un premier orifice d'injection (32) et une soupape de commande (70) actionnée par un actionneur piézo-électrique (84), qui commande au moins indirectement une liaison entre la chambre de travail (22) de la pompe et une zone de décharge (78),
    caractérisée en ce que
    l'injecteur de carburant (12) comporte un second organe d'injection (128) guidé en coulissement dans le premier organe d'injection (28), creux, et qui commande au moins un second orifice d'injection (132) et est sollicité par la pression régnant dans la chambre de pression (40) contre la force de fermeture dans le sens de l'ouverture (29), et le second organe d'injection (128) étant sollicité au moins indirectement par la pression régnant dans la chambre de commande de pression (60) remplie de carburant, dans le sens de la fermeture et
    la pression régnant dans la chambre de commande de pression (60) est commandée de manière variable selon les conditions de fonctionnement du moteur à combustion interne.
  2. Installation d'injection de carburant selon la revendication 1,
    caractérisée en ce que
    l'actionneur piézo-électrique (84) commande la pression régnant dans la chambre de pression d'actionneur (80),
    la soupape de commande (70) comporte un organe de soupape de commande (72) mobile entre une position de fermeture dans laquelle la chambre de travail de la pompe (22) est coupée de la zone de décharge (78) et une position d'ouverture dans laquelle la chambre de travail de la pompe (22) est reliée à la zone de décharge (78) et
    l'organe de commande de soupape (72) est sollicité par la pression régnant dans la chambre de pression d'actionneur (80) dans le sens de sa fermeture.
  3. Installation d'injection de carburant selon la revendication 2,
    caractérisée en ce que
    l'organe de commande de soupape (72) est sollicité sur sa face frontale non tournée vers la chambre de pression d'actionneur (80) par la pression régnant dans la chambre de commande de pression (60), dans le sens de l'ouverture.
  4. Installation d'injection de carburant selon la revendication 2 ou 3,
    caractérisée en ce que
    l'organe de soupape de commande (72) est sollicité dans le sens de l'ouverture par un ressort de rappel (82).
  5. Installation d'injection de carburant selon l'une des revendications 2 à 4,
    caractérisée en ce que
    la chambre de pression de commande (60) comporte une liaison (88) avec la chambre de pression d'actionneur (80) munie d'un clapet anti-retour (90) s'ouvrant en direction de la chambre de commande de pression (80).
  6. Installation d'injection de carburant selon l'une des revendications 1 à 5,
    caractérisée en ce que
    la chambre de pression de commande (60) est délimitée par un piston de commande (62) agissant sur le second organe d'injection (128) et
    le second organe d'injection (128) est en plus sollicité par un ressort de fermeture (144) dans le sens de la fermeture, le ressort s'appuyant de préférence contre le piston de commande (62).
  7. Installation d'injection de carburant selon la revendication 4 et 6,
    caractérisée en ce que
    le ressort de rappel (82) est serré entre l'organe de soupape de commande (72) et le piston de commande (62).
  8. Installation d'injection de carburant selon l'une des revendications précédentes,
    caractérisée en ce que
    la pression dans la chambre de commande de pression (60) est générée par une pompe de refoulement (64).
  9. Installation d'injection de carburant selon la revendication 8,
    caractérisée en ce que
    le fonctionnement de la pompe de refoulement (64) est commandé par une installation de commande (86) de façon que celle-ci génère une pression variable dans la chambre de pression de commande (60) selon les conditions de fonctionnement du moteur à combustion interne.
  10. Installation d'injection de carburant selon la revendication 8,
    caractérisée en ce que
    la pression dans la chambre de pression de commande (60) est réglée de manière variable par une soupape de décharge (66) commandée par une installation de commande (86), de manière variable, selon les conditions de fonctionnement du moteur à combustion interne.
  11. Installation d'injection de carburant selon l'une des revendications précédentes,
    caractérisée en ce qu'
    on règle une pression plus élevée à faible charge et/ou à faible vitesse de rotation du moteur à combustion interne dans la chambre de pression de commande (60) de façon que le second organe d'injection (128) reste en position fermée et que seul le premier organe d'injection (28) s'ouvre et libère au moins le premier orifice d'injection (32) et en ce que pour une charge plus élevée et/ou une vitesse de rotation plus élevée du moteur à combustion interne, une pression plus faible soit réglée dans la chambre de pression de commande (60) pour qu'en plus le second organe d'injection (128) s'ouvre et libère au moins un second orifice d'injection (132).
  12. Installation d'injection de carburant selon l'une des revendications précédentes,
    caractérisée en ce qu'
    au début d'un cycle d'injection on règle une pression plus élevée dans la chambre de pression de commande (60) pour que le second organe d'injection (128) reste en position fermée et que seul le premier organe d'injection (28) s'ouvre et libère au moins un premier orifice d'injection (32) et en ce qu'au cours de la suite du cycle d'injection, on règle une pression plus faible dans la chambre de pression de commande (60) pour qu'en plus le second organe d'injection (128) s'ouvre et libère au moins un second orifice d'injection (132).
  13. Installation d'injection de carburant selon la revendication 12,
    caractérisée en ce que
    le cycle d'injection commence par une pré-injection d'une faible quantité de carburant au cours de laquelle on règle une pression élevée dans la chambre de pression de commande (60) et
    le cycle d'injection se poursuit par une injection principale avec une quantité plus importante de carburant au cours de laquelle on règle une faible pression dans la chambre de pression de commande (60).
  14. Installation d'injection de carburant selon la revendication 13,
    caractérisée en ce qu'
    on règle une pression plus faible dans la chambre de pression de commande (60) seulement au cours de l'injection principale.
EP02796496A 2001-12-20 2002-11-11 Dispositif d'injection de carburant pour moteurs a combustion interne Expired - Lifetime EP1458970B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10162651A DE10162651A1 (de) 2001-12-20 2001-12-20 Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10162651 2001-12-20
PCT/DE2002/004160 WO2003054374A1 (fr) 2001-12-20 2002-11-11 Dispositif d'injection de carburant pour moteurs a combustion interne

Publications (2)

Publication Number Publication Date
EP1458970A1 EP1458970A1 (fr) 2004-09-22
EP1458970B1 true EP1458970B1 (fr) 2008-07-09

Family

ID=7709962

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02796496A Expired - Lifetime EP1458970B1 (fr) 2001-12-20 2002-11-11 Dispositif d'injection de carburant pour moteurs a combustion interne

Country Status (8)

Country Link
US (1) US6896208B2 (fr)
EP (1) EP1458970B1 (fr)
JP (1) JP2005513331A (fr)
KR (1) KR20040067853A (fr)
CN (1) CN100379975C (fr)
DE (2) DE10162651A1 (fr)
PL (1) PL362307A1 (fr)
WO (1) WO2003054374A1 (fr)

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DE10305187A1 (de) * 2003-02-08 2004-08-19 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung, insbesondere für Brennkraftmaschinen mit Kraftstoff-Direkteinspritzung
DE10336411A1 (de) * 2003-08-08 2005-03-03 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine
DE10352504A1 (de) * 2003-11-11 2005-06-02 Robert Bosch Gmbh Einspritzdüse
US20050224605A1 (en) * 2004-04-07 2005-10-13 Dingle Philip J Apparatus and method for mode-switching fuel injector nozzle
DE102004028521A1 (de) * 2004-06-11 2005-12-29 Robert Bosch Gmbh Kraftstoffinjektor mit mehrteiligem Einspritzventilglied und mit Druckverstärker
EP1643117B1 (fr) * 2004-10-01 2007-08-29 Delphi Technologies, Inc. Buse d'injection
DE102004061799A1 (de) * 2004-12-22 2006-07-06 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE602005005159T2 (de) * 2005-01-19 2009-04-30 Delphi Technologies, Inc., Troy Kraftstoffeinspritzventil
EP1851427B1 (fr) * 2005-02-22 2011-05-11 Continental Automotive Systems US, Inc. Injecteur a rampe commune avec dispositif actif de fermeture par pointeau
DE102005014180A1 (de) * 2005-03-29 2006-10-05 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE102006027330A1 (de) * 2006-06-13 2007-12-20 Robert Bosch Gmbh Kraftstoffinjektor
DE102006048979B8 (de) * 2006-10-17 2017-02-23 Continental Automotive Gmbh Verfahren und Einspritzsystem zum Einspritzen eines Fluids
KR100873195B1 (ko) * 2007-06-13 2008-12-10 인하대학교 산학협력단 디스펜서 헤드
GB0806705D0 (en) * 2008-04-14 2008-05-14 Delphi Tech Inc Fuel injector
CN102777300B (zh) * 2011-05-12 2015-04-01 株式会社电装 阀装置及使用其的高压泵
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Also Published As

Publication number Publication date
US6896208B2 (en) 2005-05-24
WO2003054374A1 (fr) 2003-07-03
EP1458970A1 (fr) 2004-09-22
DE10162651A1 (de) 2003-09-04
CN1492966A (zh) 2004-04-28
CN100379975C (zh) 2008-04-09
KR20040067853A (ko) 2004-07-30
JP2005513331A (ja) 2005-05-12
DE50212491D1 (de) 2008-08-21
US20040144364A1 (en) 2004-07-29
PL362307A1 (en) 2004-10-18

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