WO2003042530A1 - Dispositif d'injection de carburant conçu pour un moteur a combustion interne - Google Patents

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

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Publication number
WO2003042530A1
WO2003042530A1 PCT/DE2002/003796 DE0203796W WO03042530A1 WO 2003042530 A1 WO2003042530 A1 WO 2003042530A1 DE 0203796 W DE0203796 W DE 0203796W WO 03042530 A1 WO03042530 A1 WO 03042530A1
Authority
WO
WIPO (PCT)
Prior art keywords
control
fuel injection
chamber
valve
pump
Prior art date
Application number
PCT/DE2002/003796
Other languages
German (de)
English (en)
Inventor
Nestor Rodriguez-Amaya
Christoph Hollmann
Uwe Schmidt
Hubert Greif
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 WO2003042530A1 publication Critical patent/WO2003042530A1/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
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • 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
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing 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
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0059—Arrangements of valve actuators
    • F02M63/0064—Two or more actuators acting on two or more valve bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid

Definitions

  • the invention is based on one
  • Fuel injection device for an internal combustion engine according to the preamble of claim 1.
  • Such a fuel injection device is known from EP 0 823 549 A2.
  • This fuel injection device has a high-pressure fuel pump and a fuel injection valve connected to it for each cylinder of the internal combustion engine.
  • the high-pressure fuel pump has a pump piston which is driven by the internal combustion engine in a stroke movement and delimits a pump working space.
  • the fuel injection valve has a pressure chamber connected to the pump work chamber and an injection valve member, through which at least one injection opening is controlled and which can be moved in the opening direction to release the at least one injection opening by the pressure prevailing in the pressure chamber against a closing force.
  • a first control valve is provided, by means of which a connection of the pump work space to a relief space is controlled.
  • a second control valve is also provided, by means of which the pressure in a control pressure chamber of the fuel injection valve is controlled.
  • the injection valve member is acted upon at least indirectly in the closing direction by the pressure prevailing in the control pressure chamber.
  • Both control valves are switched by a single common electromagnetic actuator and are arranged one behind the other in the longitudinal direction. This limits the functionality of the two control valves, since they cannot be switched completely independently of one another.
  • the fuel injection device has a large overall length and may be difficult to arrange on the internal combustion engine.
  • the fuel injection device according to the invention with the features according to claim 1 has the advantage that the two control valves can be switched independently of each other by the separate actuators and by the arrangement next to each other in a common control module body, the overall length of the
  • Fuel injection device can be kept low and a simple structure can be achieved.
  • FIG. 6 shows the fuel injection device in a design according to a sixth embodiment.
  • the internal combustion engine is preferably a self-igniting internal combustion engine.
  • the fuel injection device is preferably designed as a so-called pump-nozzle unit and has for each cylinder of the internal combustion engine a high-pressure fuel pump 10 and a fuel injection valve 12 connected to it, which form a common structural unit.
  • the fuel injection device is preferably designed as a so-called pump-nozzle unit and has for each cylinder of the internal combustion engine a high-pressure fuel pump 10 and a fuel injection valve 12 connected to it, which form a common structural unit.
  • Fuel injection device can also be designed as a so-called pump-line-nozzle system, in which the high-pressure fuel pump and the fuel injection valve of each cylinder are arranged separately from one another and are connected to one another via a line.
  • the high-pressure fuel pump 10 has a pump body 14 with a cylinder bore 16, in which a pump piston 18 is tightly guided, which is driven at least indirectly 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 delimits a pump working chamber 22 in the cylinder bore 16, in which fuel is compressed under high pressure during the delivery stroke of the pump piston 18.
  • the pump working chamber 22 is supplied with fuel from a fuel tank 24 of the motor vehicle.
  • the fuel injection valve 12 has a valve body 26 which is connected to the pump body 14 and which can be constructed in several parts and in which an injection valve member 28 is guided so as to be longitudinally displaceable in a bore 30.
  • the valve body 26 has at least one, preferably a plurality of injection openings 32 at its end region facing the combustion chamber of the cylinder of the internal combustion engine.
  • the injection valve member 28 has at its end region facing the combustion chamber an, for example, approximately conical sealing surface 34 which interacts with a valve seat 36 formed in the valve body 26 in its end region facing the combustion chamber, from or after which the injection openings 32 lead away.
  • valve body 26 there is an annular space 38 between the injection valve member 28 and the bore 30 towards the valve seat 36, which in its end region facing away from the valve seat 36 merges into a pressure space 40 surrounding the injection valve member 28 by radial expansion of the bore 30.
  • the injection valve member 28 has a pressure shoulder 42 at the level of the pressure chamber 40 by reducing the cross section.
  • a prestressed closing spring 44 engages, by means of which the injection valve member 28 is pressed toward the valve seat 36.
  • the closing spring 44 is arranged in a spring chamber 46 of the valve body 26, which adjoins the bore 30.
  • Fuel tank 24 or other low pressure area is used.
  • the fuel injection device has a first control valve 62, by means of which the connection 59 of the channel 54 and thus of the pump work chamber 22 to the relief chamber 24 is controlled.
  • Fuel injection device also has a second control valve 66, through which the connection 56 of the control pressure chamber 52 with the channel 54 and thus with the pump work chamber 22 is controlled.
  • a connection 70 leads from the control pressure chamber 52 to a relief chamber, which in turn is at least indirectly the one
  • Fuel tank 24 can serve.
  • a throttle point 71 is preferably provided in the connection 70.
  • the two control valves 62, 66 are designed as 2/2-way valves and can be switched between an open and a closed switching position.
  • the control valves 62, 66 each have a valve member 63 or 67, which can be moved by means of an electromagnetic actuator 64 or 68 against the force of a return spring 65 or 69.
  • the two control valves 62, 66 are combined to form a control module and are arranged in a common control module body 74 which is clamped between the valve body 26 and the pump body 14.
  • the two control valves 62, 66 are arranged side by side in the control module body 74.
  • the electromagnetic actuators 64, 68 of the control valves 62, 66 are connected to an electronic control device 76, by means of which the control valves 62, 66 are switched depending on the operating parameters of the internal combustion engine.
  • the function of the fuel injection device according to the first exemplary embodiment is explained below.
  • fuel is supplied to the pump working chamber 22 via the connection 59 with the first control valve 62 open, for example by means of a feed pump 78.
  • both control valves 62, 66 can be closed by appropriate control of their actuators 64, 68 by the control device 76, so that the pump work chamber 22 is separated from the relief chamber 24 and the control pressure chamber 52 is separated from the pump work chamber 22 , It can also be provided that the first control valve 62 is closed during the delivery stroke of the pump piston 18, so that the pump work chamber 22 is separated from the relief chamber 24, while the second control valve 66 remains in its open position, so that the control pressure chamber 52 with the pump work chamber 22 is connected so that 22 high pressure builds up in the pump workspace, the
  • fuel injector 12 remains closed.
  • the start of fuel injection is made possible in that the second control valve 66 is closed, so that the control pressure chamber 52 is separated from the pump work chamber 22.
  • High pressure builds up in the pressure chamber 40 of the fuel injection valve 12 and when the force exerted on the injection valve member 28 by the pressure via the pressure shoulder 42 is greater than the force exerted on the injection valve member 28 by the closing spring 44 and the pressure prevailing in the control pressure chamber 52 via the piston 50 Force, the injection valve member 28 moves in its opening direction 29 and releases the at least one injection opening 32.
  • the pressure at which the fuel injection valve 12 opens and the pressure can be varied Fuel injection starts.
  • the time period during which the second control valve 66 is closed determines the time period during which the fuel injection valve 12 is open and thus the amount of fuel injected.
  • the control device 76 opens the second control valve 66, so that the control pressure chamber 52 is connected to the pump working chamber 22 and the fuel injection valve 12 as a result of the pressure control chamber 52 prevailing high pressure closes.
  • the first control valve 62 remains closed, so that the pump working chamber 22 is separated from the relief chamber 24.
  • the first control valve 62 can also be opened by the control device 76, so that the pump working chamber 22 is connected to the relief chamber 24 and that
  • Fuel injection valve 12 closes due to the low pressure in the pressure chamber 40. For another one
  • Fuel injection during a main injection is closed by the control device 76, both control valves 62, 66, so that the pump work chamber 22 is separated from the relief chamber 24 and the control pressure chamber 52 is separated from the pump work chamber 22 and the fuel injection valve 12 opens.
  • the pressure at which the fuel injection valve 12 opens for the main injection can in turn be determined by corresponding control of the second control valve 66 by the control device 76. It can also be provided in order to limit the pressure at which the fuel injection takes place, to open the second control valve 66 briefly during the fuel injection and / or to open the first control valve 62 briefly. This can be provided in particular at high engine speeds.
  • control device 76 activates the second control valve 66 opened so that the fuel injection valve 12 closes under the influence of the high pressure prevailing in the control pressure chamber 52, while the first control valve 62 remains closed.
  • the control device 76 closes the second control valve 66 again, so that the fuel injection valve 12 opens again.
  • both control valves 62, 66 are opened.
  • FIG. 2 shows the fuel injection device according to a second exemplary embodiment, in which only the design of the first control valve 162, which is designed as a 2/3 directional control valve, is modified compared to the first exemplary embodiment.
  • the first control valve 162 is between a first open switch position, in which it unblocks the connection 59 between the pump work chamber 22 and the relief chamber 24, a second open switch position, in which it opens the connection 59 via a throttle point 158, and a third closed switch position switchable, in which the pump work chamber 22 is separated from the relief chamber 24.
  • the first control valve 162 For a pre-injection and / or at the beginning of a main injection, the first control valve 162 is brought into its second open switching position by the control device 76, so that the pre-injection and / or the start of the main injection takes place at a reduced pressure, since there is in the pump work chamber 22 and in Pressure chamber 40 cannot build up full high pressure as a result of the connection via throttle point 158. Provision can also be made for the first control valve 162 to be brought directly from its first, fully open switching position into its third, fully closed switching position by the control device 76, a variable opening pressure of the fuel injection valve 12 being activated by the control device accordingly controlling the second control valve 66 76 is made possible. FIG.
  • FIG 3 shows the fuel injection device according to a third exemplary embodiment, in which only the arrangement of the second control valve 66 is modified compared to the first and second exemplary embodiments.
  • the second control valve 66 is arranged in the connection 70 of the control pressure chamber 52 with the relief chamber 24 and controls them.
  • the connection 56 of the control pressure chamber 52 with the channel 54 and thus the pump work chamber 22 is constantly open. If the fuel injection valve 12 is to be opened and fuel is to be injected, the second control valve 66 is opened by the control device 76, so that no high pressure can build up in the control pressure chamber 52.
  • control device 76 closes the second control valve 66, so that the high pressure builds up in the control pressure chamber 52 as in the pump work chamber 22 and the fuel injection valve 12 closes.
  • FIG. 4 shows the fuel injection device according to a fourth exemplary embodiment, in which the design of the second control valve 166 is modified compared to the first and second exemplary embodiments.
  • the second control valve 166 is designed as a 3/2-way valve, by means of which the connection 170 of the control pressure chamber 52 to the relief chamber 24 is opened in a first switching position and the control pressure chamber 52 is separated from the pump working chamber 22 and by which the connection 156 of the Control pressure chamber 52 opened with the pump work chamber 22 and the control pressure chamber 52 is separated from the relief chamber 24.
  • a throttle point 157 is provided in the connection 156 and a throttle point 171 is provided in the connection 170.
  • the second control valve 166 When the fuel injector 12 open If and fuel injection is to take place, the second control valve 166 is brought into its first switching position by the control device 76, in which the control pressure chamber 52 is relieved. If the fuel injection valve 12 is to close and the fuel injection is to be interrupted, the second control valve 166 is brought into its second switching position by the control device 76, so that high pressure builds up in the control pressure chamber 52.
  • control valves 62, 66 and 162, 166 can be combined with one another in any manner.
  • FIG. 5 shows a section of the fuel injection device in a construction according to a fifth exemplary embodiment.
  • FIG. 5 essentially shows the control module body 74 with the control valves 62, 66 arranged in it, which can be designed in accordance with one of the exemplary embodiments explained above and in the fifth exemplary embodiment shown are each designed as a 2/2-way valve.
  • the control module body 74 is at least approximately cylindrical and is arranged between the valve body 26 of the fuel injection valve 12 and the pump body 14 of the high-pressure fuel pump 10, which are only partially shown in FIG. 5.
  • the two control valves 62, 66 are of identical design according to FIG. 5 and are arranged next to one another in the control module body 74 without an offset in the longitudinal direction to one another.
  • valve members 63, 67 of the control valves 62, 66 are each piston-shaped and are guided in a bore 80, 81 of the control module body 74.
  • the valve members 63, 67 interact to control the connection 59 and 56, each with a valve seat 83, 84, the Control valves 62, 66 are in their open switching position when the valve members 63, 67 are not in contact with the respective valve seat 83, 84 and are in their closed switching position when the valve members 63, 67 are in contact with the respective valve seat 83, 84.
  • the respective return springs 65, 69 act on the valve members 63, 67.
  • the electromagnetic actuators 64, 68 of the control valves 62, 66 each comprise a magnet coil 86, 87 and a magnet armature 89, 90 connected to the valve members 63, 67.
  • the magnet coils 86, 87 are inserted in annular recesses 92, 93 of the control module body 74, and the magnet armatures 89, 90 are connected to the valve members 63, 67 at their end regions lying outside the magnet coils 86, 87.
  • the material of the control module body 74 is used as a magnetic conductor and as a magnetic yoke.
  • FIG. 6 shows a section of the fuel injection device in an embodiment according to a sixth exemplary embodiment.
  • the basic structure is the same as in the fifth exemplary embodiment and only the arrangement of the solenoids 86, 87 of the actuators 64, 68 of the control valves 62, 66 is modified such that these are arranged in recesses 192, 193 of insert elements 195, 196 inserted in the control module body 174.
  • the control valves 62, 66 are also arranged essentially next to one another in the longitudinal direction with a slight offset to one another.
  • the insert elements 195, 196 are preferably made of high-quality soft magnetic material and serve as a magnetic yoke.
  • the insert elements 195, 196 are in correspondingly shaped depressions 197, 198 of the control module body 174 inserted and fastened therein, for example by means of screwing, pressing, welding or soldering.

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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)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un dispositif d'injection de carburant comportant pour chaque cylindre du moteur à combustion interne une pompe d'alimentation en carburant haute pression (10) ainsi qu'une soupape d'injection de carburant (12) reliée à cette dernière. Un piston (18) de la pompe d'alimentation en carburant haute pression (10) est entraîné selon un mouvement de va-et-vient par l'intermédiaire du moteur à combustion interne et délimite une chambre de travail de la pompe (22), laquelle est reliée à une chambre de pression (40) de la soupape d'injection de carburant (12). Cette dernière comprend un élément de soupape d'injection (28) permettant de commander au moins une ouverture d'injection (32) et pouvant être déplacé dans une direction d'ouverture (29), contre une pression de fermeture, par l'intermédiaire de la pression régnant dans la chambre de pression (40). Une première soupape de commande (62) permet de commander un raccordement (59) entre la chambre de travail de la pompe (22) et une chambre de décharge (24), et une seconde soupape de commande (66) permet de commander la pression régnant dans une chambre de pression de commande (52) de la soupape d'injection de carburant (12), l'élément de soupape d'injection (28) étant actionné dans une direction de fermeture par l'intermédiaire de la pression régnant dans la chambre de pression de commande (52). Ces deux soupapes de commande (62, 66) comprennent des actionneurs électromagnétiques séparés (64, 68) et sont disposées dans un corps modulaire de commande (74) commun.
PCT/DE2002/003796 2001-11-13 2002-10-08 Dispositif d'injection de carburant conçu pour un moteur a combustion interne WO2003042530A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2001155674 DE10155674A1 (de) 2001-11-13 2001-11-13 Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine
DE10155674.8 2001-11-13

Publications (1)

Publication Number Publication Date
WO2003042530A1 true WO2003042530A1 (fr) 2003-05-22

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PCT/DE2002/003796 WO2003042530A1 (fr) 2001-11-13 2002-10-08 Dispositif d'injection de carburant conçu pour un moteur a combustion interne

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WO (1) WO2003042530A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4220974B2 (ja) 2005-02-28 2009-02-04 三菱重工業株式会社 電磁制御燃料噴射装置の構造
US7255091B2 (en) * 2005-05-31 2007-08-14 Caterpillar, Inc. Fuel injector control system and method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0823549A2 (fr) 1996-08-06 1998-02-11 Lucas Industries Public Limited Company Injecteur
EP0987430A2 (fr) * 1998-09-16 2000-03-22 Lucas Industries Limited Injecteur de combustible
EP0987431A2 (fr) * 1998-09-18 2000-03-22 Lucas Industries Limited Injecteur de carburant
EP1120563A2 (fr) * 2000-01-27 2001-08-01 Delphi Technologies, Inc. Injecteur de carburant
EP1211411A2 (fr) * 2000-12-01 2002-06-05 Robert Bosch Gmbh Injecteur modulaire pour injecter du combustible

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0823549A2 (fr) 1996-08-06 1998-02-11 Lucas Industries Public Limited Company Injecteur
EP0987430A2 (fr) * 1998-09-16 2000-03-22 Lucas Industries Limited Injecteur de combustible
EP0987431A2 (fr) * 1998-09-18 2000-03-22 Lucas Industries Limited Injecteur de carburant
EP1120563A2 (fr) * 2000-01-27 2001-08-01 Delphi Technologies, Inc. Injecteur de carburant
EP1211411A2 (fr) * 2000-12-01 2002-06-05 Robert Bosch Gmbh Injecteur modulaire pour injecter du combustible

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