EP2198147A1 - Système d'injection et procédé de fabrication - Google Patents

Système d'injection et procédé de fabrication

Info

Publication number
EP2198147A1
EP2198147A1 EP08786832A EP08786832A EP2198147A1 EP 2198147 A1 EP2198147 A1 EP 2198147A1 EP 08786832 A EP08786832 A EP 08786832A EP 08786832 A EP08786832 A EP 08786832A EP 2198147 A1 EP2198147 A1 EP 2198147A1
Authority
EP
European Patent Office
Prior art keywords
valve
chamber
injection system
piston
actuator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08786832A
Other languages
German (de)
English (en)
Inventor
Fredrik Borchsenius
Uwe Jung
Grit KRÜGER
Eberhard Kull
Volker Mohr
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
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP2198147A1 publication Critical patent/EP2198147A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • 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
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0043—Two-way 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
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0077—Valve seat details
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49405—Valve or choke making

Definitions

  • the invention relates to an injection system for injecting fuel under a predetermined fuel pressure with a high-pressure area under the fuel pressure and with a low-pressure area and a method for producing such a scoring system.
  • the technical field of the invention relates to injection systems, in particular common rail injection systems or common rail injectors with hydraulic transmission.
  • a switching leakage is effected.
  • FIG. 1 shows a schematic view of a known injector I, at which the principle-related occurrence of the switching leakage as well as a conventional approach for reducing the occurrence of switching leakage will be discussed.
  • the injector I depicted in FIG. 1 has a magnetic actuator MA, a high-pressure port HA for carrying out a high-pressure fuel, a switching valve SV and a nozzle D, by means of which the fuel is injected.
  • a control piston SK is arranged between a nozzle needle DN and the switching valve SV, which is actuated by means of the solenoid actuator MA.
  • the pressure drop arises in particular because an outflow throttle AD between the control chamber SR and the switching valve SV having valve space VR is greater than an inlet throttle ZD, which couples the high-pressure port HA with the control chamber SR.
  • an outflow throttle AD between the control chamber SR and the switching valve SV having valve space VR is greater than an inlet throttle ZD, which couples the high-pressure port HA with the control chamber SR.
  • This fuel flowing out during injection is referred to as switching leakage.
  • the occurrence of switching leakage disadvantageously means the loss of energy because compressed fuel flows into the low pressure area of the injector.
  • control piston SK shown in Fig. 1 on a cone K which serves as a stop.
  • the control piston SK which moves in the direction of the magnet actuator MA, closes with its cone K a channel which goes to the outlet throttle AD.
  • the pressure builds up in the control room SR at least partially.
  • the pressure builds up in control room SR until it is larger than that
  • Another object is to reduce or minimize the switching leakage of an injection system without reducing the diameter of the control piston.
  • an injection system for injecting fuel and a predetermined fuel pressure having a high pressure region under pressure and a low pressure region comprising: a) a controllable actuator having an operating stroke for indirectly actuating a nozzle needle which opens and closes a nozzle Opening direction or in a closing direction provides; b) a switching valve arranged in a valve space of the high-pressure region, which valve has a valve mushroom and opens or closes as a function of the operating stroke provided; c) an inlet throttle, which is arranged to supply the fuel between a high pressure port and a control piston having control chamber of the high pressure region; d) a first outlet throttle, which is arranged between the control chamber and the valve chamber; e) a first sealing edge of the valve chamber, which forms with the valve mushroom with the nozzle closed a first sealing seat for sealing between the piston chamber and the valve chamber; f) a second sealing edge of a valve piston having a piston chamber, which forms with the valve piston at a maximum operating stroke of the actuator
  • a method for manufacturing a single injection system for injecting fuel and an Being ⁇ voted fuel pressure with a proposed under the fuel pressurized high-pressure region and a low pressure area comprising the steps of: a) providing a controllable actuator, which has a Operating stroke for indirectly actuating a nozzle needle which opens or closes a nozzle, in an opening ⁇ direction or in a closing direction provides; b) arranging a switching valve in a valve chamber of the high-pressure region, which has a valve mushroom and opens or closes depending on the operating stroke provided; c) arranging an inlet throttle for supplying the fuel between a high pressure port and a control piston having control chamber of the high pressure region; d) arranging a first outlet throttle between the control chamber and the valve chamber; e) equipping the valve chamber with a first sealing edge, which forms with the valve mushroom with the nozzle closed a first sealing seat for sealing between the piston chamber and the valve chamber; f) providing a piston chamber having a valve piston with a
  • the advantage of the present invention is the reduction or minimization of the switching leakage of the injection system according to the invention. This is possible even with a diameter of the control piston which is larger or significantly larger than the diameter of the nozzle needle.
  • the diameter d 1 of the first outlet throttle is greater than the diameter d 3 of the inlet throttle.
  • the diameter of the first outlet throttle in relation to the diameter of the inlet throttle primarily affects the opening speed of the injection system or injector. That is, the larger the outlet throttle can be formed relative to the inlet throttle, the faster the pressure in the control chamber is reduced, whereupon the control piston in the control chamber moves upward. As a result, the nozzle needle is opened.
  • the first outlet throttle is made smaller relative to the inlet throttle, the dead time until the nozzle needle begins to move would be too small for several injections in shorter intervals. stand one after another. Consequently, according to the invention, the first outlet throttle is large in diameter relative to the diameter of the inlet throttle, so that the injector or the injection system opens with less dead time.
  • the nozzle needle completely open or the control piston at the top, so only one outlet throttle would be needed, which is only slightly larger than the inlet throttle. The outlet throttle would then only have to be so large that pressure could no longer build up in the control chamber which is greater than the pressure in the nozzle needle chamber.
  • a second outlet throttle is provided between the low-pressure area and the high-pressure area, which has a diameter d2 which is slightly larger than the diameter d3 of the inlet throttle, but smaller than the diameter dl of the first outlet throttle.
  • valve piston is raised in a first step by means of the actuator only so far that opens the first sealing edge, so the first sealing seat is in an open state and the large, first outlet throttle can act fully. Furthermore, the second sealing seat is open at this time.
  • the control piston has reached its maximum lift in the opening direction, that is, it is at the top, the second sealing seat is in a closed state and the first sealing seat in an open state.
  • the switching valve remains in an open state, there is no pendulum movement of the control piston and the nozzle needle, the switching leakage is significantly reduced by the smaller diameter of the second outlet throttle relative to the first outlet throttle.
  • the second outlet throttle is therefore made so that it is only slightly larger in flow than the inlet throttle, so that in the control room just no to close the nozzle needle necessary pressure can be built up.
  • the volume flow of the switching leakage is reduced to a value close to the flow of the inlet throttle, that of the second outlet throttle. It is thus achieved a reduced switching leakage, especially for operating conditions with fully open nozzle needle or nozzle.
  • This therefore constitutes the possibility according to the invention of reducing the switching leaks, in particular at points of maximum nozzle needle stroke, ie precisely when the delivery rate of the injection system reaches its limits.
  • Switching leakage also has an improved energy balance of the injection system result and thus leads to a lower fuel consumption of a vehicle equipped with the injection system according to the invention motor vehicle.
  • the diameter dl of the first outlet throttle is significantly larger than the diameter d3 of the inlet throttle formed (dl >> d3).
  • This embodiment is made possible in particular by the provision of the second outlet throttle and has the advantage that a faster opening of the nozzle is made possible by the larger, first outlet throttle.
  • the high-pressure port for supplying the fuel with the predetermined fuel pressure in the high-pressure region is arranged.
  • control piston arranged in the control chamber of the high-pressure region is coupled to the nozzle needle and also suitable for being moved in the closing direction when the switching valve is opened in the opening direction and when the switching valve is closed.
  • valve piston arranged in a piston chamber transmits the operating stroke provided by the actuator to the valve mushroom of the switching valve.
  • the actuator is designed as a piezo actuator or as a magnetic actuator.
  • the piezoelectric actuator has a controllable piezo stack which, depending on a control signal, provides a stroke or operating stroke for the indirect actuation of the nozzle needle in the closing direction or in the opening direction.
  • the piezo-actuator is suitable by means of the valve piston, during the injection process within a first period, the first sealing seat in an open state and the second sealing seat in an open state and within a second period following the first period to operate the first sealing seat in the opened state and the second sealing seat in a closed state.
  • the first outlet throttle can fully act, which allows a quick opening of the nozzle.
  • an increased pressure drop in the control chamber is no longer necessary because the nozzle is already open.
  • the Switching leakage can be reduced by means of the arrangement of the smaller, second outlet throttle.
  • the piezo actuator is adjustable during the injection process at least to an intermediate stroke and to the maximum operating stroke.
  • the first sealing seat is in the opened state and the second sealing seat is also in the opened state.
  • the second sealing seat is in the closed state with the first sealing seat in the opened state.
  • the piezoelectric actuator is controllable such that it remains at the intermediate stroke and / or at the maximum operating stroke each for a predetermined period of time.
  • the first period for the opening of the nozzle and the second period for the injection process with the nozzle open are indirectly adjustable.
  • the piezoelectric actuator is designed such that its stroke speed is adjustable during the injection process.
  • an alternative for an adjustable on an intermediate stroke piezoelectric actuator is provided, with which the first period and the second period are mapped.
  • the piezoactuator is controllable such that the first time period and / or the second time period can be set to a respective predeterminable time duration.
  • the first period and the second period are advantageously directly adjustable.
  • the second outlet throttle is at least partially formed as a bore through a housing portion of the injection system. According to a further preferred embodiment, the second outlet throttle is at least partially formed as a bore through the valve piston.
  • the second outlet throttle is at least partially formed as a passage in the second sealing seat.
  • the valve piston can be equipped at least with a recess which at least partially forms the passage at the maximum operating stroke of the actuator.
  • the piston chamber can identify at least one passage region, which at least partially forms the passage at the maximum operating stroke of the actuator.
  • FIG. 1 shows a schematic view of a known injector
  • FIG. 2 shows a schematic longitudinal sectional view of an exemplary embodiment of an injection system according to the invention in a first operating state
  • Fig. 2a is a schematic partial view of an upper portion of the injection system of Fig. 2;
  • FIG. 2b shows a schematic detail view of a lower region of the injection system according to FIG. 2;
  • FIG. 3 shows a schematic longitudinal sectional view of the exemplary embodiment of the injection system according to the invention in a second operating state
  • FIG. 3a shows a schematic detail view of an upper region of the injection system according to FIG. 3
  • FIG. 3b shows a schematic partial view of a lower region of the injection system according to FIG. 3
  • FIG. 3a shows a schematic detail view of an upper region of the injection system according to FIG. 3
  • FIG. 3b shows a schematic partial view of a lower region of the injection system according to FIG. 3
  • FIG. 3b shows a schematic partial view of a lower region of the injection system according to FIG. 3
  • FIG. 3a shows a schematic detail view of an upper region of the injection system according to FIG. 3
  • FIG. 3b shows a schematic partial view of a lower region of the injection system according to FIG. 3
  • FIG. 3a shows a schematic detail view of an upper region of the injection system according to FIG. 3
  • FIG. 3b shows a schematic partial view of a lower region of the injection system according to FIG. 3
  • FIG. 4 shows a schematic detail view of a first alternative to the configuration of the upper region of the injection system according to FIG. 3a;
  • FIG. 5 shows a schematic detail view of a second alternative to the embodiment of the upper region of the injection system according to FIG. 3;
  • Fig. 6 is a schematic detail view of a third alternative to the embodiment of the upper portion of the injection system according to Fig. 3a;
  • FIG. 7 is a schematic flow diagram of a method according to the invention for producing an injection system.
  • Figures 2 and 3 with their respective detail views 2a, 2b and 3a, 3b show an embodiment of the injection system 1 according to the invention or injector for injecting fuel at a predetermined fuel pressure P with a standing under the fuel pressure P high pressure area HD and a low pressure area ND.
  • the injection system 1 has a controllable actuator 5, a switching valve 7 arranged in a valve chamber 6 of the high-pressure region HD, an inlet throttle 14, a first outlet throttle 15, a first sealing edge 16 of the valve chamber 6, a second sealing edge 18 of a piston chamber 8 and a valve piston 9 a second outlet throttle 20.
  • Fig. 2 and the associated detail views 2a and 2b show the injection system 1 in a first operating state.
  • the first operating state is characterized by a first sealing seat 17 in a closed state and a second sealing seat 19 in an opened state. Consequently, that is
  • FIG. 3 and the associated detail views 3a and 3b, the injection system 1 in a second operating state.
  • the second operating state is characterized by the first sealing seat 17 in the opened state and the second sealing seat 19 in an opened state.
  • the controllable actuator 5 provides an operating stroke for the indirect actuation of the nozzle needle 3, which opens or closes the nozzle 4, in an opening direction R 1 or in a closing direction R 2.
  • FIG. 2 b shows a closed nozzle 4 and FIG. 3 b shows an opened nozzle 4, through which the fuel is sprayed.
  • the switching valve 7 has at least one valve mushroom 10 and opens in dependence on the provided operating stroke of the actuator 5.
  • the inlet throttle 14 for supplying the fuel P is arranged between a high pressure port 13 and a control piston 11 having a control chamber 11 of the high pressure area HD.
  • the nozzle needle 3 for opening and closing the nozzle 4, in which the fuel P is injected is arranged in a nozzle space 2 of the high-pressure area.
  • the high pressure port 13 is also located in the high pressure area HD.
  • the high-pressure port 13 is suitable for supplying the fuel with the predetermined fuel pressure P.
  • the first outlet throttle 15 is arranged between the control chamber 11 and the valve chamber 6.
  • the first sealing edge 16 of the valve chamber 6 forms with the valve mushroom 10 of the switching valve 7, for example a servo valve, with the nozzle 4 closed, a first sealing seat 17 for sealing between the piston chamber 8 and the valve chamber 6.
  • the second sealing edge 18 of the piston chamber 8 forms with the valve piston 9 at a maximum operating stroke of the actuator 5, a second sealing seat 19 for sealing between the piston chamber 8 and the valve chamber 6.
  • the minimum diameter d 1 of the first outlet throttle 15 is designed such that it is greater than the minimum diameter d 2 of the second outlet throttle 20 and greater than the minimum diameter d 3 of the inlet throttle 14. Further, the diameter d 2 of the second outlet throttle 20 is designed such that it greater than the diameter 3 of the inlet throttle 14 is. Overall, therefore, dl> d2> d3. Preference is further dl >> d3. According to the embodiment according to FIG. 3 a, the second outlet throttle 20 is designed as a bore through a housing region 21 of the injection system 1.
  • the control piston 12 arranged in the control chamber 11 of the high-pressure region HD is coupled to the nozzle needle 3 in particular by means of a stroke adjusting pin 23. Furthermore, the control piston 12 is preferably adapted to be moved in the opening direction Rl when the switching valve 7 is opened and in the closing direction R2 when the switching valve 7 is closed. Furthermore, a high-pressure chamber 21 is preferably provided in the nozzle chamber 2, which provides a reservoir of fuel at the predetermined fuel pressure P for lifting the nozzle needle 3.
  • the arranged in the piston chamber 8 transfers
  • the actuator 5 is, for example, as a magnetic actuator or preferably as a piezoelectric actuator Actuator trained.
  • the configuration of the actuator as a piezoelectric actuator 5 preferably has a controllable piezo stack which, depending on a control signal, provides a stroke or operating stroke for the indirect actuation of the nozzle needle 3 in the opening direction R1 or in the closing direction R2.
  • a piezoelectric actuator 5 is shown in each case.
  • the piezoactuator 5 is preferably coupled to a contact device 22, by means of which the control signal can be transmitted to the outer electrodes of the piezoactuator 5.
  • the piezo-actuator 5 is suitable by means of the valve piston 9, during the injection process within a first period, the first sealing seat 17 in an open state and the second sealing seat 19 in an open state (see in particular Fig. 3a) and within one on the first Period subsequent second period to operate the first sealing seat 17 in the open state and the second sealing seat 19 in a closed state (not shown).
  • the piezoelectric actuator 5 is adjustable in particular during the injection process to an intermediate stroke, in which the first sealing seat 17 and the second sealing seat 19 are each in the open state (see in particular Fig. 3a).
  • the piezo actuator 5 is adjustable to the maximum operation stroke at which the first seal seat 17 in the opened state and the second seal seat 19 is in the closed state (not shown).
  • the piezoelectric actuator 5 can be controlled such that it remains at the intermediate stroke and / or at the maximum operating stroke for a predetermined period of time.
  • the piezoelectric actuator 5 can be configured such that its stroke speed is adjustable during the injection process. Furthermore, the piezoactuator 5 can be controlled in such a way that the first period and / or the second period can be set to a certain period of time.
  • FIGS. 4 to 6 show three alternatives to the embodiment of the upper region of the injection system 1 according to FIG. 3a. These alternatives relate in particular to the configuration of the second outlet throttle 20.
  • the second outlet throttle is designed as a bore through the valve piston 9.
  • the second outlet throttle 20 is formed as a passage 22, 23 in the second sealing seat 19.
  • the valve piston 9 according to FIG. 5 has at least one recess 22, which forms the passage at the maximum operating stroke of the actuator 5.
  • the piston chamber 8 according to FIG. 6 has at least one passage region 23, which forms the passage at the maximum operating stroke of the actuator 5.
  • FIG. 7 shows a schematic flow diagram of an exemplary embodiment of the method according to the invention for producing an injection system 1 for injecting fuel at a predetermined fuel pressure P having a high-pressure region HD under the fuel pressure and a low-pressure region ND.
  • the method according to the invention will be explained below with reference to the block diagram in FIG. 7 with reference to the various representations of the injection system 1 according to FIGS. 2, 2a, 2b, 3, 3a and 3b.
  • the method according to the invention has the following method steps S1 to S8:
  • a controllable actuator 5 is provided which provides an operating stroke for indirectly actuating a nozzle needle 3 in an opening direction R1 or in a closing direction R2 which opens or closes a nozzle 4.
  • a switching valve 7 is arranged in a valve chamber 6 of the high-pressure area HD, which has a valve mushroom 10 and opens or closes depending on the operating stroke provided.
  • An inlet throttle 14 is arranged to supply the fuel between a high pressure port 13 and a control piston 12 having control chamber 11 of the high pressure area HD.
  • a first outlet throttle 15 is arranged between the control chamber 11 and the valve chamber 6.
  • the valve chamber 6 is equipped with a first sealing edge 16, which forms a first sealing seat 17 for sealing between the piston chamber 8 and the valve chamber 6 with the valve mushroom 10 with the nozzle 4 closed.
  • the second sealing edge 18 forms with the valve piston 9 at a maximum operating stroke of the actuator 5, a second sealing seat 19 for sealing between the piston chamber 8 and the valve chamber 6.
  • a second outlet throttle 20 is provided, which is preferably formed as a bore between the low pressure region ND and a region between the first and second sealing edge 16, 18.
  • a ratio between a diameter d 1 of the first outlet throttle 15, a diameter d 2 of the second outlet throttle 20 and a diameter d 3 of the inlet throttle 14 is set as follows: d 1> d 2> d 3.
  • the present invention has been described in terms of the preferred embodiments, it is not limited thereto but is modifiable in a variety of ways.
  • the described embodiments of the second outlet throttle namely the bore through the housing area, the bore through the valve piston, the recess of the valve piston and the passage area of the piston chamber, as long as the resulting minimum overall diameter of the combination is greater than the minimum Diameter of the inlet throttle and smaller than the minimum diameter of the first outlet throttle is.

Landscapes

  • 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 système d'injection de carburant comportant un actionneur commandable produisant une levée de fonctionnement pour l'actionnement indirect d'une aiguille de soupape; une soupape de commutation disposée dans une chambre de soupape de la zone haute pression, présentant une tête de soupape; un clapet d'étranglement d'arrivée disposé, pour l'alimentation en carburant, entre une connexion haute pression et une chambre de commande de la zone haute pression, présentant un piston de commande; un premier clapet d'étranglement de sortie disposé entre la chambre de commande et la chambre de soupape; une première arête d'étanchéité de la chambre de soupape, formant avec la tête de soupape, un premier siège d'étanchéité pour l'étanchéité entre la chambre de piston et la chambre de soupape, lorsque la buse est fermée; une deuxième arête d'étanchéité d'une chambre de piston présentant un piston de soupape, formant avec le piston de soupape, un deuxième siège d'étanchéité pour l'étanchéité au moins essentielle entre la chambre de piston et la chambre de soupape, lorsque la levée de fonctionnement de l'actionneur est maximale; et un deuxième clapet d'étranglement de sortie connectant la chambre de piston (6) à la zone basse pression (ND) entre la première et la deuxième arête d'étanchéité (16, 18), d1 > d2 > d3, d1 étant le diamètre minimal du premier clapet d'étranglement de sortie, d2 le diamètre minimal du deuxième clapet d'étranglement de sortie et d3 le diamètre minimal du clapet d'étranglement d'entrée.
EP08786832A 2007-09-06 2008-08-04 Système d'injection et procédé de fabrication Withdrawn EP2198147A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007042466A DE102007042466B3 (de) 2007-09-06 2007-09-06 Einspritzsystem mit reduzierter Schaltleckage und Verfahren zum Herstellen eines Einspritzsystems
PCT/EP2008/060219 WO2009033887A1 (fr) 2007-09-06 2008-08-04 Système d'injection et procédé de fabrication

Publications (1)

Publication Number Publication Date
EP2198147A1 true EP2198147A1 (fr) 2010-06-23

Family

ID=39878019

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08786832A Withdrawn EP2198147A1 (fr) 2007-09-06 2008-08-04 Système d'injection et procédé de fabrication

Country Status (5)

Country Link
US (1) US8459232B2 (fr)
EP (1) EP2198147A1 (fr)
CN (1) CN101849098B (fr)
DE (1) DE102007042466B3 (fr)
WO (1) WO2009033887A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007053403B4 (de) * 2007-11-09 2016-06-09 Continental Automotive Gmbh Verfahren und Vorrichtung zum Bestimmen einer schwingungsoptimierten Einstellung einer Einspritzvorrichtung
US20090165749A1 (en) * 2007-12-27 2009-07-02 Caterpillar Inc. Engine and control valve assembly having reduced variability in operation over time
DE102009027187A1 (de) * 2009-06-25 2010-12-30 Robert Bosch Gmbh Kraftstoffinjektor
DE102009045995A1 (de) * 2009-10-26 2011-06-09 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung
DE102011007106A1 (de) * 2011-04-11 2012-10-11 Robert Bosch Gmbh Brennstoffeinspritzventil
EP2975257B1 (fr) 2014-07-18 2018-01-10 Continental Automotive GmbH Unité de commande pour commander une tige de soupape d'un injecteur de carburant et injecteur de carburant
DE102016220071A1 (de) * 2016-10-14 2018-04-19 Continental Automotive Gmbh Servoinjektor mit minimalen Ventilraumvolumen

Family Cites Families (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5526791A (en) * 1995-06-07 1996-06-18 Diesel Technology Company High-pressure electromagnetic fuel injector
GB9606803D0 (en) * 1996-03-30 1996-06-05 Lucas Ind Plc Injection nozzle
DE59808465D1 (de) 1997-12-23 2003-06-26 Siemens Ag Einspritzventil mit steuerventil
DE59908941D1 (de) 1998-05-28 2004-04-29 Siemens Ag Kraftstoffeinspritzventil für brennkraftmaschinen
US6092737A (en) * 1999-02-02 2000-07-25 General Motors Corporation Direct acting fuel injector
DE19907544C2 (de) 1999-02-22 2002-12-05 Siemens Ag Injektor für eine Einspritzanlage einer Brennkraftmaschine
DE19939453A1 (de) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Ventileinrichtung
JP4048699B2 (ja) * 1999-11-10 2008-02-20 株式会社デンソー 燃料噴射弁
US6293254B1 (en) * 2000-01-07 2001-09-25 Cummins Engine Company, Inc. Fuel injector with floating sleeve control chamber
DE10031574B4 (de) * 2000-06-29 2008-12-04 Robert Bosch Gmbh Druckgesteuerter doppelschaltender Hochdruckinjektor
DE10055267B4 (de) * 2000-11-08 2004-07-29 Robert Bosch Gmbh Druckgesteuerter Injektor für Hocheinspritzung mit Schieberdrosseln
DE10055644A1 (de) * 2000-11-10 2002-05-23 Siemens Ag Verfahren zum Einstellen eines Leerhubs eines Injektors, wobei der Leerhub durch eine Aktoreinheit mit einem elektrisch ansteuerbaren Aktor und einen vom Aktor betätigten Ventilkolben gebildet wird
DE10063698A1 (de) * 2000-12-20 2002-07-04 Siemens Ag Hochdruckeinspritzsystem mit Ausführung einer Steuerdrossel als Kaskadendrossel
DE10120157A1 (de) * 2001-04-25 2002-11-07 Bosch Gmbh Robert Kraftstoffinjektor mit Steuerventil-integriertem Drosselelement
US6663014B1 (en) * 2002-06-28 2003-12-16 Caterpillar Inc Method and system of intensifier piston control
GB0215490D0 (en) * 2002-07-04 2002-08-14 Delphi Tech Inc Control valve arrangement
DE10240442C1 (de) 2002-09-02 2003-12-24 Siemens Ag Kraftstoffinjektor mit einem Steuerventil
DE10254749A1 (de) 2002-11-23 2004-06-17 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung mit einem 3/3-Wege-Steuerventil zur Einspritzverlaufsformung
DE10326257A1 (de) 2003-06-11 2005-01-05 Robert Bosch Gmbh Ventil zum Steuern von Flüssigkeiten
DE10326260A1 (de) 2003-06-11 2005-01-05 Robert Bosch Gmbh Kraftstoffeinspritzventil und Verfahren zu dessen Steuerung
US6928986B2 (en) * 2003-12-29 2005-08-16 Siemens Diesel Systems Technology Vdo Fuel injector with piezoelectric actuator and method of use
US7021565B2 (en) * 2004-02-10 2006-04-04 Caterpillar Inc. Pressure modulated common rail injector and system
JP2006257874A (ja) * 2004-04-30 2006-09-28 Denso Corp インジェクタ
DE102005059169A1 (de) * 2005-12-12 2007-06-14 Robert Bosch Gmbh Kraftstoffinjektor mit direkt betätigbarem Einspritzventilglied
FR2897396B1 (fr) 2006-02-16 2008-03-21 Renault Sas Vanne de commande pour chambre de commande d'un injecteur a aiguille pour moteur a combustion interne
JP4855946B2 (ja) * 2006-06-08 2012-01-18 株式会社デンソー 燃料噴射弁

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009033887A1 *

Also Published As

Publication number Publication date
US20100192911A1 (en) 2010-08-05
US8459232B2 (en) 2013-06-11
CN101849098B (zh) 2012-06-20
CN101849098A (zh) 2010-09-29
WO2009033887A1 (fr) 2009-03-19
DE102007042466B3 (de) 2009-04-09

Similar Documents

Publication Publication Date Title
EP1654455B1 (fr) Soupape de commande pour un injecteur de carburant contenant un multiplicateur de pression
EP1718862B1 (fr) Soupape d'injection de carburant pour moteurs a combustion interne
DE102005028866A1 (de) Direkt gesteuerte Brennstoffeinspritzvorrichtung mit der Fähigkeit einer Einspritzsequenz mit Voreinspritzung und Haupteinspritzung
DE4332119A1 (de) Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen
EP2198147A1 (fr) Système d'injection et procédé de fabrication
DE19910589C2 (de) Einspritzventil für eine Brennkraftmaschine
EP1944500A2 (fr) Injecteur de carburant
WO2005015002A1 (fr) Soupape de commande conçue pour un injecteur de carburant comprenant un dispositif multiplicateur de pression
WO2008049699A1 (fr) Injecteur de carburant
DE10033428C2 (de) Druckgesteuerter Injektor zum Einspritzen von Kraftstoff
DE10031582A1 (de) Druckgesteuerter Injektor mit gesteuerter Düsennadel
WO2005015000A1 (fr) Soupape de commande a compensation de pression pour un injecteur de carburant comprenant un multiplicateur de pression
EP1939441A2 (fr) Injecteur de carburant
DE102005000639A1 (de) Druckmodulierte Common-Rail-Einspritzvorrichtung und Einspritzsystem
WO2005040595A1 (fr) Injecteur de carburant dote d'un element de soupape d'injection en plusieurs parties, en commande directe
WO2018162747A1 (fr) Soupape d'injection de carburant
WO2006058604A1 (fr) Injecteur de carburant
DE19752851C1 (de) Hydraulisches Absteuerventil
DE10101797A1 (de) Einspritzventil
EP2798192B1 (fr) Injecteur de carburant pour moteur à combustion
WO2003074865A1 (fr) Systeme pour moduler en pression le comportement d'injection
DE102010023698A1 (de) Einspritzventil mit Direkt- und Servoantrieb
WO2003004861A1 (fr) Injecteur de carburant a soupape de commande a equilibrage des forces
EP1276983B1 (fr) Soupape servant a diriger des liquides
EP1045976A1 (fr) Unite de commande pour commander la montee en pression dans un ensemble pompe

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20100406

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20140301