EP1573197B1 - Unite d'injecteur-pompe et procede pour regler la pression d'ouverture de celle-ci - Google Patents

Unite d'injecteur-pompe et procede pour regler la pression d'ouverture de celle-ci Download PDF

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Publication number
EP1573197B1
EP1573197B1 EP03813529A EP03813529A EP1573197B1 EP 1573197 B1 EP1573197 B1 EP 1573197B1 EP 03813529 A EP03813529 A EP 03813529A EP 03813529 A EP03813529 A EP 03813529A EP 1573197 B1 EP1573197 B1 EP 1573197B1
Authority
EP
European Patent Office
Prior art keywords
spring
pressure
force
nozzle
pump
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 - Fee Related
Application number
EP03813529A
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German (de)
English (en)
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EP1573197A1 (fr
Inventor
Maximilian Kronberger
Dejan Jovovic
Leonhard Trapp
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.)
Continental Automotive GmbH
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Continental Automotive GmbH
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Filing date
Publication date
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Publication of EP1573197A1 publication Critical patent/EP1573197A1/fr
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Publication of EP1573197B1 publication Critical patent/EP1573197B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F02M2200/505—Adjusting spring tension by sliding spring seats
    • 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
    • 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
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators

Definitions

  • the invention relates to a method for adjusting the nozzle opening pressure of a pump-nozzle unit for supplying fuel into a combustion chamber of an internal combustion engine, wherein the pump-nozzle unit comprises: a fuel injection nozzle having a nozzle needle movable back and forth between a closed position and an open position comprises a spring which exerts on the nozzle needle a closing force, the amount of which depends on a force exerted on the spring biasing force, and a first pressure chamber which can be acted upon by a first pressure, wherein an opening force is exerted on the nozzle needle by the first pressure.
  • the invention relates to a pump-nozzle unit for supplying fuel into a combustion chamber of an internal combustion engine, in particular a pump-nozzle unit whose nozzle orifice pressure has been adjusted by the method according to the invention, with a fuel injector, the one between a closed position and an open position and has movable nozzle needle, and with a spring through which a closing force is exerted on the nozzle needle, the height of which depends on a force exerted on the spring selected biasing force.
  • Such pump-nozzle units are used in particular in connection with pressure-controlled injection systems.
  • An essential feature of a pressure-controlled injection system is that the fuel injector opens as soon as an opening force, which is influenced at least by currently prevailing pressures, is exerted on the nozzle needle.
  • Such pressure-controlled injection systems are used for fuel metering, fuel preparation, the formation of the course of injection and a seal of the fuel supply against the combustion chamber of the internal combustion engine.
  • With pressure-controlled injection systems can be the timing of the flow rate during the injection control in an advantageous manner. This can have a positive influence on the engine's performance, fuel consumption and pollutant emission.
  • the fuel pump and the fuel injection nozzle is formed as an integrated component.
  • at least one pump-nozzle unit is provided, which is usually installed in the cylinder head.
  • the fuel pump typically comprises a fuel pump piston which can be moved back and forth in a fuel pump cylinder and which is driven either directly by a tappet or indirectly via rocker arms by a camshaft of the internal combustion engine.
  • the usually forming a second pressure chamber portion of the fuel pump cylinder is connected via a control valve with a fuel low pressure region, wherein sucked with the control valve open fuel from the low-pressure fuel area in the second pressure chamber and pushed back at further open control valve from the second pressure chamber in the low-pressure fuel area becomes.
  • the fuel pump piston compresses the fuel in the second pressure chamber and thus builds up the pressure.
  • the second pressure chamber communicates with a first pressure chamber, wherein a first pressure prevailing in the first pressure chamber exerts an opening force on the nozzle needle, for example on a section of the nozzle needle having a shoulder.
  • the first pressure prevailing in the first pressure chamber, in which the nozzle needle opens and an injection takes place, is referred to as nozzle opening pressure.
  • nozzle opening pressure The first pressure prevailing in the first pressure chamber, in which the nozzle needle opens and an injection takes place.
  • the required thickness of an insert disc can be calculated, which is inserted to bias the spring and thus to change the nozzle opening pressure in the pump-nozzle unit.
  • the pump-nozzle unit in the prior art must be at least partially disassembled and reassembled after inserting the dial. Subsequently, it is necessary in many cases to check the changed by the insertion of the washer nozzle opening pressure again on the pressure test. If the desired nozzle opening pressure is not yet achieved with the mounted insert disk, it is necessary to disassemble the unit injector again and to use an insert disk with a different thickness.
  • the invention has the object of developing the generic method and the generic pump-nozzle units such that an accurate nozzle opening pressure is ensured in a cost effective manner.
  • the method according to the invention builds on the state of the art in that it comprises the following concurrently executed steps: applying the first pressure space at a first pressure, and varying the biasing force applied to the spring until a selected biasing force is reached at which moves the nozzle needle at the desired level of the first pressure in the open or closed position.
  • the first pressure can be varied, if this is advantageous.
  • the first pressure for adjusting the nozzle opening pressure is preferably not generated via the fuel pump assigned to the pump-nozzle unit, at least in the operational state, but externally. The movement of the nozzle needle in the open or closed position, for example, directly and / or over the. History of the first pressure to be detected.
  • the method according to the invention makes it possible to set the nozzle opening pressure very accurately without (multiple) disassembly and assembly steps and results in a stable pumping function.
  • the method is provided so that an end portion of the spring is locked in a selected position which the end portion of the spring occupies when the selected biasing force is applied to the spring.
  • the locking of the end portion of the spring is preferably also fully automatically, either while the selected biasing force is detected or subsequently.
  • the method is further provided so that the locking of the end portion of the spring in the selected position by a inserted into the pump-nozzle unit biasing element, which is the selected position of the End section of the spring forces.
  • the biasing member may act on the end portion of the spring either directly or indirectly, for example, via another member.
  • the method may be arranged to provide the biasing member of suitable dimensions to force the selected position of the end portion of the spring.
  • a pump-nozzle unit whose nozzle-opening pressure has been adjusted according to this embodiment may not be differentiated from a unit injector whose nozzle-opening pressure has been adjusted by the known method explained in the opening paragraph.
  • this embodiment of the method according to the invention can also be carried out much more simply than the known methods, since the suitable dimensions of the pretensioning element, in contrast to the prior art, need not be calculated by the spring rate of the spring and so on, but for example by a length measurement or a hydraulic opening pressure measurement can be determined directly, so that a multiple disassembly and assembly can be avoided in any case.
  • the method is provided so that the biasing member is locked in a selected position to force the selected position of the end portion of the spring.
  • the biasing member is locked in a selected position which ensures the selected biasing force, it is not necessary in this embodiment to provide biasing members of defined length classes.
  • the biasing element by frictional and / or positive connection locked in its selected position.
  • a frictional engagement is particularly preferred, for example, a frictional engagement with a coefficient of friction of 0.1 ö 0.2.
  • the method is provided so that the biasing element to achieve the frictional and / or positive connection is transformed.
  • Such reshaping can be achieved, for example, by pressing the biasing element into a conical section of the spring chamber.
  • the biasing element is in the form of a sleeve or a slotted sleeve.
  • biasing element is designed in the form of a cup, in the bottom of which a bore is provided.
  • the biasing element is arranged in a conical section of the pump-nozzle unit and formed conically at least in sections.
  • the variation of the biasing force is effected by changing the position of the biasing element.
  • the biasing member for example, by means of a Einziehstkovs be pressed gradually or continuously into the spring chamber until the desired nozzle opening pressure results.
  • the force required for pressing in the biasing element is preferably significantly higher than the selected Biasing force. This can be ensured, for example, by providing a suitable coefficient of friction or a suitable coefficient of friction.
  • the variation of the biasing force is effected by changing the position of a mandrel.
  • the Einschstempel provided for pressing in the biasing member has a bore through which the mandrel extends, wherein an end portion of the mandrel may act directly or indirectly on the end portion of the spring.
  • the mandrel can act, for example via a perforated disc on the end portion of the spring.
  • the biasing member is preferably brought to its final selected position by the retraction punch only when the selected biasing force is determined.
  • the inventive pump-nozzle unit is based on the generic state of the art in that the height of the selected biasing force depends on a selected position of a biasing member in which the biasing member is locked in the pump-nozzle unit.
  • the pump-nozzle units according to the invention differ from the known pump-nozzle units in that the height of the selected biasing force not via a biasing element with defined dimensions, such as an insert disc with a defined thickness, but on the position or position of the biasing member in the Pump-nozzle unit is set.
  • Such pump-nozzle units can be produced more cost-effectively than the known pump-nozzle units, since the adjustment of the nozzle opening pressure on the position of the biasing element can be carried out inexpensively, for example by the inventive method.
  • the biasing element forces a selected position of an end portion of the spring.
  • the biasing element is locked by frictional and / or positive locking in its selected position.
  • the biasing element is converted to achieve the frictional and / or positive connection.
  • the pump-nozzle unit according to the invention also comprises embodiments in which it is provided that the pretensioning element is designed in the form of a sleeve or a slotted sleeve.
  • the biasing element is in the form of a cup, in the bottom of which a bore is provided.
  • the pretensioning element may be conical at least in sections.
  • the biasing element is arranged in a conical section of the pump-nozzle unit.
  • Essential to the invention is the recognition that the nozzle opening pressure can be set very accurately and inexpensively, when the biasing force of the spring is varied while pressure applied to the first pressure chamber until the desired injection behavior is achieved.
  • FIG. 1 shows a schematically illustrated embodiment of the pump-nozzle unit according to the invention.
  • the illustrated pump-nozzle unit 10 for supplying fuel 12 into a combustion chamber 14 of an internal combustion engine has a fuel pump 32-40.
  • a fuel pump piston 36 in a fuel pump cylinder 34 is movable back and forth.
  • the fuel pump piston 36 is driven directly or indirectly via a camshaft, not shown, of the internal combustion engine.
  • the compression space of the fuel pump cylinder 34 forms a second pressure chamber 32.
  • the second pressure chamber 32 is connected via a fuel line 38 with a piezoelectric-operated control valve 40 known per se.
  • the control valve 40 serves to either close the fuel line 38 or to a fuel low pressure area 42 to connect, can be sucked from the fuel 12.
  • the illustrated unit injector 10 further includes a fuel injector, generally designated 16, which has a nozzle needle 18 reciprocable between a closed position and an open position.
  • the related to FIG. 1 upper end portion of the nozzle needle 18 has a disc 48 and a guide pin 56, which in the in FIG. 1 embodiment shown in a spring chamber 30 is guided.
  • a spring 20 is disposed in the spring chamber 30 and exerts a downward closing force on the disc 48 and the guide pin 56 and thus the nozzle needle 18 from.
  • the upper end portion 24 of the spring 20 is supported on a cup-shaped biasing member 26 which is locked in a selected position Y S in the spring chamber 30.
  • selected position Y S of the shutter member 26 forces a selected position X S of the end portion 24 of the spring 20 via the selected position Y S is the closure element 26 and the selected position X S of the end portion 24 of the spring 20 set a selected biasing force F S , which is exerted on the spring 20.
  • the height of this selected biasing force F S affects the nozzle opening pressure, which will be explained in more detail below.
  • a first pressure chamber 22 surrounds a portion of the nozzle needle 18 having a shoulder 46.
  • the first pressure chamber 22 communicates via a connecting line 44 with the second pressure chamber 32.
  • stationary fuel exerts an opening force on the nozzle needle 18.
  • This opening force counteracts the force exerted by the spring 20 on the disc 48 and the guide pin 56 closing force.
  • the closure element 26 is locked in the spring chamber 30 by frictional engagement, for example, a coefficient of friction of 0.1 ö 0.2 can be provided.
  • the closure element 26 and / or the spring chamber 30 may be at least partially conical in order to facilitate the locking of the closure element 26 in the spring chamber 30.
  • the spring chamber 30 and / or another portion of the pump-nozzle unit can be pressurized to affect the opening behavior of the nozzle needle 18.
  • a pressure prevailing in the spring chamber 30 would exert a further closing force on the disc 48 and the guide pin 56 in addition to the closing force generated by the spring 20.
  • the method according to the invention can be used in an advantageous manner, as will be explained in more detail below.
  • FIG. 2 is a diagram illustrating the setting of the nozzle opening pressure according to a first embodiment of the method of the present invention.
  • FIG. It is in a spring chamber 30 shown only in sections a spring 20 is arranged, whose lower end portion, not shown, exerts a closing force on a nozzle needle.
  • a biasing member 26 formed in the form of a perforated cup forces the upper end portion 24 of the spring 20 into a selected position X S and applies a selected biasing force F S to the spring 20.
  • the arrangement is chosen such that the biasing member 26 can be pressed by a Einziehstkov 50 in the spring chamber 30, wherein the force required for this purpose F E is significantly higher than the selected biasing force F S.
  • the biasing member 26 is frictionally locked in the spring chamber 30 with respect to the selected biasing force F s , but can be pushed further into the spring chamber 30 by a significantly higher force F E exerted on the retractable punch 50.
  • the biasing member 26 is based on the representation of FIG. 2 pressed so far down into the spring chamber 30 or until it assumes a selected position Y S , in which the end portion 24 of the spring 20 is fixed in a selected position X S , in which the selected biasing force F S exerted on the spring 20 becomes.
  • the setting of the selected biasing force F S will be described below with reference to FIG FIGS. 3a to 3d explained in more detail.
  • FIG. 3a shows a graph illustrating a possible course of the force exerted on the spring biasing force as a function of time for the first embodiment of the method according to the invention
  • FIG. 3b shows a graph illustrating a possible course for the pump pressure as a function of time for the first embodiment of the method according to the invention
  • Figure 3c shows a graph illustrating a possible course for the nozzle chamber pressure or the first pressure and the opening and closing behavior of the nozzle needle as a function of time for the in FIG. 3a shown force curve and the in FIG. 3b illustrated pressure curve
  • 3d figure shows the injection behavior of the unit injector unit as a function of time for which FIG. 3a shown Force curve and the in FIG. 3b illustrated pressure curve.
  • FIG. 3a shows a possible course of the force exerted on the spring biasing force as a function of time for the first embodiment of the method according to the invention
  • FIG. 3b shows a graph illustrating a possible course for the pump pressure as a function of time for the first embodiment of
  • FIG. 3b It can be seen that the system during the adjustment process with a constant second pressure p 32 is applied in the illustrated case 700 bar.
  • the second pressure p 32 is not used to adjust the nozzle opening pressure by the fuel pump 32 to 42 (see FIG. 1 ) but externally.
  • FIG. 3a It can be seen that the biasing force exerted on the spring 20 is gradually increased. Based on the illustration of Figure 2, the increase in the biasing force F by the Einziehstempel 50 is gradually moved further down, so that the spring 20 is biased gradually over the biasing member 26 further.
  • Figure 3c illustrates the course of the first pressure p 22 within the first pressure chamber 22 (see FIG. 1 ).
  • Figure 3c to take the opening and closing behavior of the nozzle needle, wherein the first pressure p 22 at which the nozzle needle respectively opens, also increases with an increasing biasing force, as the first pressure p 22 , in which the nozzle needle closes again.
  • the biasing force F is incrementally increased until the nozzle needle 20 opens at a selected first (opening) pressure p 22S .
  • the biasing force F exerted on the spring 20 at this time corresponds to the selected biasing force F S. Once this selected biasing force F S is reached, the Einziehstkov 50 (see FIG.
  • stepwise increase of the biasing force F is alternatively also a continuous increase of the biasing force F in question.
  • FIG. 4 is a diagram showing the setting of the nozzle opening pressure according to a second embodiment.
  • FIG of the inventive method illustrated.
  • a spring 20 is disposed in a spring chamber 30 shown only in sections, the lower end portion, not shown, a closing force on a nozzle needle 18 exerts.
  • a perforated disc 54 is disposed between a biasing member 26 and the upper end portion 24 of the spring 20.
  • the biasing member 26 is formed in the form of a perforated cup, wherein a mandrel 28 extends through the recess in the biasing member 26 and a biasing force F on the perforated disc 54 and thus the spring 20 can exercise.
  • the mandrel 28 further extends through a bore 52 provided in a retractable die 50, such that the mandrel 28 can be moved up and down in a direction Z independently of the retractable die 50.
  • FIG. 4 is the biasing member 26 already in its selected position Y S , in which the upper end portion 24 of the spring 20 is forced over the perforated disc 54 in its selected position X S.
  • the biasing member 26 and the Einziehstempel 50 with respect to the illustration of FIG.
  • biasing member 26 As an alternative to locking the biasing member 26 in the spring chamber 30, it is also possible to detect, for example, the distance that the mandrel 28 has been moved into the spring chamber 30 until the selected biasing force F S is reached, and then insert a biasing member of a defined length which ensures the selected position X S of the end portion 24 of the spring 20.
  • the following explanation of the determination and adjustment of the selected biasing force F S refers to an embodiment of the invention, in accordance with the representation of FIG. 4 a biasing member 26 is used, which is locked in a selected position Y S in the spring chamber 30.
  • FIG. 5a shows a graph illustrating a possible course of the force exerted on the spring biasing force as a function of time for the second embodiment of the method according to the invention
  • FIG. 5b shows a graph illustrating a possible curve for the pump pressure as a function of time for the second embodiment of the method according to the invention
  • FIG. 5c shows a graph illustrating a possible course for the first pressure and the opening and closing behavior of the nozzle needle as a function of time for the in FIG. 5a shown force curve and the in FIG. 5b illustrated pressure curve
  • FIG. 5d shows the injection behavior of the unit injector unit as a function of time for which FIG. 5a shown force curve and the in FIG. 5b illustrated pressure curve.
  • the second pressure p 32 in the second pressure space 32 is preferably provided by an external pressure source to determine the selected biasing force F S or to set the nozzle opening pressure to p 22S . How to do this by comparing the FIGS. 5b and 5c can be seen, a setting run is first performed while the nozzle needle 18 repeatedly opens and closes (see FIG. 5c ). For this purpose, a second pressure p 32 of 500 bar to the system created (see FIG. 5b ). At the same time, the mandrel 28 is acted upon by the spring 20 FIG. 4 a relatively low biasing force of 500 N exercised.
  • both the second pressure p 32 and the biasing force F is increased, wherein to increase the biasing force F of the mandrel 28 with respect to the representation of FIG. 4 continue down.
  • the Einziehstempel 50 and the biasing member 26 of FIG. 4 even in a higher position than shown, so that the spring 20 can be more or less compressed by an up and down movement of the mandrel 28 and thus biased.
  • the preload force F has been increased to more than 700 N, it is gradually reduced again (see FIG. 5a ) by the mandrel 28 of FIG. 4 is moved up again.
  • FIG. 6a shows a graph illustrating a possible course of the force exerted on the spring biasing force as a function of time for a third embodiment of the method according to the invention
  • FIG. 6b shows a graph illustrating a possible course for the pump pressure as a function of time for the third embodiment of the method according to the invention
  • FIG. 6c shows a graph illustrating a possible course for the first pressure and the opening and closing behavior of the nozzle needle as a function of time for the in FIG. 6a shown force curve and the in FIG. 6b illustrated pressure curve
  • FIG. 6d shows the injection behavior of the unit injector unit as a function of time for which FIG. 6a shown force curve and the in FIG. 6b illustrated pressure curve.
  • the pressure which is preferably also generated externally in this case, is p 32 in FIG FIG. 6b illustrated case 750 bar.
  • a buzzing of the nozzle needle 18, that is, the nozzle needle 18 opens and closes at short intervals (see FIG. 6c ). This makes it possible to detect the desired opening pressure p 22s exclusively over the course of the first pressure p 22 .
  • the biasing force F for example, as long as continuous (see FIG.
  • FIG. 7 shows a schematic representation of a biasing element in the form of a sleeve or a slotted sleeve
  • FIG. 8 shows a schematic representation of a biasing element in the form of a deep-drawn or flow-pressed and perforated cup
  • FIG. 9 shows a schematic representation of a biasing element in the form of a conical plug.

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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)

Claims (13)

  1. Procédé de réglage de la pression d'ouverture d'un injecteur d'une unité de pompe à injection (10) pour acheminer du carburant (12) dans une chambre de combustion (14) d'un moteur à combustion interne, dans lequel l'unité de pompe à injection (10) présente :
    - un injecteur de carburant (16), qui présente un pointeau (18) mobile en va-et-vient entre une position de fermeture et une position d'ouverture,
    - un ressort (20), qui exerce sur le pointeau (18) une force de fermeture dont le niveau dépend d'une force de précontrainte (F) exercée sur le ressort (20), et
    - une première chambre de pression (22) qui peut être soumise à une première pression (p22), cette première pression (p22) exerçant une force d'ouverture sur le pointeau (18),
    dans lequel on effectue simultanément les étapes suivantes qui consistent à :
    - soumettre la première chambre de pression (22) à une première pression (p22) , et
    - faire varier la force de précontrainte (F) exercée sur le ressort (20) jusqu'à ce que soit atteinte une force de précontrainte choisie (FS), à laquelle le pointeau (20) se déplace au niveau souhaité de la première pression (p22) dans la position d'ouverture ou de fermeture, dans lequel procédé le blocage du segment d'extrémité (24) du ressort (20) dans la position choisie (XS) se fait par un élément de précontrainte (26) placé dans l'unité de pompe à injection (10), lequel élément force la position choisie (XS) du segment d'extrémité (24) du ressort (20), dans lequel l'élément de précontrainte (26) est bloqué dans une position choisie (YS) pour forcer la position choisie (XS) du segment d'extrémité (24) du ressort (20) et dans lequel l'élément de précontrainte (26) est bloqué dans sa position choisie (YS) par friction ;
    caractérisé en ce que
    l'élément de précontrainte (26) se présente sous la forme d'un bouchon conique et l'élément de précontrainte (26) est aménagé dans un segment conique de l'unité de pompe à injection (10).
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    un segment d'extrémité (24) du ressort (20) est bloqué dans une position choisie (XS) qui reçoit le segment d'extrémité (24) du ressort (20) lorsque la force de précontrainte choisie (FS) est exercée sur le ressort (20).
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    l'élément de précontrainte (26) présente les dimensions appropriées pour forcer la position choisie (XS) du segment d'extrémité (24) du ressort (20).
  4. Procédé selon la revendication 1,
    caractérisé en ce que
    l'élément de précontrainte (26) est bloqué dans sa position choisie (YS) par adaptation de formes.
  5. Procédé selon la revendication 1 ou 4,
    caractérisé en ce que
    l'élément de précontrainte (26) est façonné de manière à assurer la friction et/ou l'adaptation de formes.
  6. Procédé selon l'une quelconque des revendications 1 à 5,
    caractérisé en ce que
    l'élément de précontrainte (26) se présente sous la forme d'une douille ou d'une douille fendue.
  7. Procédé selon l'une quelconque des revendications 1 à 6,
    caractérisé en ce que
    l'élément de précontrainte (26) se présente sous la forme d'un godet dans le fond duquel est ménagé un orifice.
  8. Procédé selon l'une quelconque des revendications 1 à 7,
    caractérisé en ce que
    la variation de la force de précontrainte (F) se fait par modification de la position (Y) de l'élément de précontrainte (26).
  9. Procédé selon l'une quelconque des revendications 1 à 7,
    caractérisé en ce que
    la variation de la force de précontrainte (F) se fait par modification de la position d'une broche (28).
  10. Unité de pompe à injection (10) pour acheminer du carburant (12) dans une chambre de combustion (14) d'un moteur à combustion interne, dont la pression permettant d'ouvrir l'injecteur est réglé par le procédé selon l'une quelconque des revendications précédentes, comprenant
    - un injecteur de carburant (16), qui présente un pointeau (18) mobile en va-et-vient entre une position de fermeture et une position d'ouverture,
    - un ressort (20), qui exerce sur le pointeau (18) une force de fermeture dont le niveau dépend d'une force de précontrainte choisie (Fs) exercée sur le ressort (20),
    dans laquelle le niveau de la force de précontrainte choisie (FS) dépend d'une position choisie (YS) d'un élément de précontrainte (26), dans laquelle l'élément de précontrainte (26) est bloqué dans l'unité de pompe à injection (10), dans laquelle l'élément de précontrainte (26) force une position choisie (XS) d'un segment d'extrémité (24) du ressort (20) et dans lequel l'élément de précontrainte (26) est bloqué par friction dans sa position choisie (YS),
    caractérisée en ce que
    l'élément de précontrainte (26) se présente sous la forme d'un bouchon conique, et en ce que l'élément de précontrainte (26) est aménagé dans un segment conique de l'unité de pompe à injection (10).
  11. Unité de pompe à injection (10) selon la revendication 10,
    caractérisé en ce que
    l'élément de précontrainte (26) est façonné de manière à assurer la friction et/ou une adaptation de formes.
  12. Unité de pompe à injection (10) selon l'une quelconque des revendications 10 ou 11,
    caractérisé en ce que
    l'élément de précontrainte (26) se présente sous la forme d'une douille ou d'une douille fendue.
  13. Unité de pompe à injection (10) selon l'une quelconque des revendications 10 à 12,
    caractérisé en ce que
    l'élément de précontrainte (26) se présente sous la forme d'un godet dans le fond duquel est ménagé un orifice.
EP03813529A 2002-12-20 2003-12-11 Unite d'injecteur-pompe et procede pour regler la pression d'ouverture de celle-ci Expired - Fee Related EP1573197B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10260346 2002-12-20
DE10260346 2002-12-20
PCT/DE2003/004094 WO2004057181A1 (fr) 2002-12-20 2003-12-11 Unite d'injecteur-pompe et procede pour regler la pression d'ouverture de celle-ci

Publications (2)

Publication Number Publication Date
EP1573197A1 EP1573197A1 (fr) 2005-09-14
EP1573197B1 true EP1573197B1 (fr) 2009-09-23

Family

ID=32519265

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03813529A Expired - Fee Related EP1573197B1 (fr) 2002-12-20 2003-12-11 Unite d'injecteur-pompe et procede pour regler la pression d'ouverture de celle-ci

Country Status (5)

Country Link
US (1) US20060000924A1 (fr)
EP (1) EP1573197B1 (fr)
JP (1) JP2006509959A (fr)
DE (2) DE10310585A1 (fr)
WO (1) WO2004057181A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014230110A (ja) * 2013-05-23 2014-12-08 Kddi株式会社 無線端末がアクセスポイントを発見するシステム、プログラム及び方法
EP2901483B1 (fr) * 2013-06-24 2016-09-07 Ideal Power Inc. Systèmes, circuits, dispositifs et procédés avec transistors bipolaires bidirectionnels

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Publication number Priority date Publication date Assignee Title
US2855003A (en) * 1956-01-11 1958-10-07 Ellis B Thaxton Pipe stoppers
US2985378A (en) * 1960-07-19 1961-05-23 Gen Motors Corp Accumulator type injection apparatus
DE1157175B (de) * 1961-10-24 1963-11-14 Deutsche Erdoel Ag Sicherheitskopfstueck zum Heben von Schwerstangen und Bohrgestaenge
US3525365A (en) * 1966-10-17 1970-08-25 Pneumo Dynamics Corp Expansion plug
US3642032A (en) * 1970-04-16 1972-02-15 Fischer Cook Inc Internal pipe clamp applying apparatus and method
US3685786A (en) * 1970-08-31 1972-08-22 Riley D Woodson Elastic valve element having variable orifice
US3698431A (en) * 1971-07-12 1972-10-17 Earl Clayton Thompson Water dispenser for animals
GB1439932A (en) * 1972-04-10 1976-06-16 Hartridge Ltd Leslie Apparatus for testing fuel injector pumps
JPS59218359A (ja) * 1983-05-25 1984-12-08 Mitsubishi Heavy Ind Ltd 燃料噴射ポンプ
US4660770A (en) * 1985-09-25 1987-04-28 United Technologies Diesel Systems, Inc. Electromagnetic fuel injector
JPS62288366A (ja) * 1986-06-06 1987-12-15 Kubota Ltd ディーゼルエンジンの燃料噴射装置への燃料供給方法
DE3844373A1 (de) * 1988-12-30 1990-07-05 Mak Maschinenbau Krupp Verfahren und vorrichtung zum einstellen eines definierten duesenoeffnungsdruckes eines einspritzventils
US5301874A (en) * 1990-05-26 1994-04-12 Robert Bosch Gmbh Adjusting sleeve for an electromagnetically actuatable valve
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JP3856206B2 (ja) * 2001-11-06 2006-12-13 株式会社デンソー 蓄圧容器およびその製造方法

Also Published As

Publication number Publication date
DE50311952D1 (de) 2009-11-05
DE10310585A1 (de) 2004-07-15
WO2004057181A1 (fr) 2004-07-08
JP2006509959A (ja) 2006-03-23
EP1573197A1 (fr) 2005-09-14
US20060000924A1 (en) 2006-01-05

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