EP1435453A1 - Nach innen öffnende Variodüse - Google Patents
Nach innen öffnende Variodüse Download PDFInfo
- Publication number
- EP1435453A1 EP1435453A1 EP03020865A EP03020865A EP1435453A1 EP 1435453 A1 EP1435453 A1 EP 1435453A1 EP 03020865 A EP03020865 A EP 03020865A EP 03020865 A EP03020865 A EP 03020865A EP 1435453 A1 EP1435453 A1 EP 1435453A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle needle
- pressure
- fuel injection
- fuel
- chamber
- 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.)
- Granted
Links
- 230000009977 dual effect Effects 0.000 title 1
- 238000002485 combustion reaction Methods 0.000 claims abstract description 39
- 239000000446 fuel Substances 0.000 claims description 104
- 238000002347 injection Methods 0.000 claims description 37
- 239000007924 injection Substances 0.000 claims description 37
- 239000007921 spray Substances 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
Images
Classifications
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B1/00—Engines characterised by fuel-air mixture compression
- F02B1/12—Engines characterised by fuel-air mixture compression with compression ignition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
- F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
- F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
- F02M45/08—Injectors peculiar thereto
- F02M45/086—Having more than one injection-valve controlling discharge orifices
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- 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
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- 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
- F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
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- 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
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/105—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive hydraulic drive
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- 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
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
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- 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
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- 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
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- 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
- F02M63/0045—Three-way valves
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- 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
- F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
-
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/46—Valves, e.g. injectors, with concentric valve bodies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/46—Valves
- F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/46—Valves
- F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
- F02M59/468—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means using piezoelectric operating means
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- 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
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
Definitions
- the invention relates to a fuel injector for an internal combustion engine according to the preamble of the claim 1.
- DE 40 23 223 A1 discloses a fuel injection nozzle with two coaxial nozzle needles known.
- a common nozzle needle seat for both nozzle needles intended.
- each fuel under one An angle of, for example, 60 ° to the longitudinal axis of the Fuel injector injected into the combustion chamber.
- a fuel injector for one Internal combustion engine with a protruding into the combustion chamber Nozzle body, with two coaxial spring-loaded Nozzle needles, with the outer nozzle needle in the nozzle body is guided, with a first nozzle needle seat in the nozzle body for the outer nozzle needle and with a second one Nozzle needle seat for the inner nozzle needle, the inner one Nozzle needle is guided in the outer nozzle needle and the second nozzle needle seat arranged in the outer nozzle needle is that injections can be achieved both in Direction of the longitudinal axis of the fuel injector as also at almost any angle to it Longitudinal axis can take place in the combustion chamber. This can the operating behavior of the internal combustion engine further be optimized, which is particularly advantageous on the Noise and emission development of the internal combustion engine effect.
- the inner Nozzle needle with its end facing away from the combustion chamber first control chamber present in the outer nozzle needle limited at one end, and that one with the outer nozzle needle cooperating closure piece the first control room limited elsewhere.
- a simple construction of the inventive construction Allows fuel injector.
- the diameter of the inner nozzle needle can be increased its end facing away from the combustion chamber larger than that Diameter of the pressure shoulder of the inner nozzle needle or there is a closing spring in the first control room, one end on the inner nozzle needle and supported at the other end on the closure piece.
- the fuel injection nozzle provides that the first control room over a first inlet throttle with fuel from the common rail that the first control room is supplied via a first Flow restrictor and a first directional valve, in particular a 2/2-way valve, with a fuel return hydraulically connected, the first Inlet throttle in the closing piece or in the outer one Nozzle needle can be arranged and the first outlet throttle is arranged in the closure piece.
- All of these Common design variants is the simple one Manufacturability and because of the resulting high Manufacturing accuracy a favorable operating behavior of the Fuel injection nozzle.
- Design variant is provided that the second Control room via a second inlet throttle with fuel is supplied from the common rail, and that the second Control room via a second outlet throttle and via a second directional valve, in particular a 2/2-way valve, with the fuel return is hydraulically connected.
- the second control room can be accessed via the Supply hole, the first control room and the second Inlet throttle supplied with fuel from the common rail be, in which case the second control room over a second outlet throttle and a second directional valve, in particular a 2/2-way valve with the fuel return communicates and the first pressure chamber with a pressure can be acted upon, which is greater than the pressure in the common rail is.
- This configuration of the invention Fuel injector ensures that the in Common rail pressure does not have to be as high as the desired maximum injection pressure and also stands the injection pressure is not permanent, but only during the Injection in the fuel injector.
- a further advantageous embodiment of the invention provides before that the second inlet throttle in the closure piece is arranged so that the tuning of inlet throttles and flow restrictors of the fuel injector according to the invention immediately in the manufacture of the Closure piece can be made. That too can the manufacture of the invention Fuel injector and their operating behavior easy way to improve. The scatter in the Operating behavior of the fuel injection nozzles at one Large-scale production can be reduced.
- the directional valves can by a Electromagnets or a piezo actuator can be operated.
- FIG. 1 is a first embodiment fuel injector 1 according to the invention Longitudinal section shown.
- the fuel injector 1 consists essentially of a nozzle body 3, in which an outer nozzle needle 5 is sealingly guided.
- an outer nozzle needle 5 is also an inner nozzle needle 7 performed sealing.
- a combustion chamber end 9 protrudes the fuel injector 1 in a not shown Combustion chamber of an internal combustion engine. Not at that End of the nozzle body 3 facing away from the combustion chamber it is closed with a closure piece 11.
- the fuel injector 1 is from a common rail 114 via a high-pressure fuel line 13 with below high pressure fuel.
- the tax and Leakage quantities are via a fuel return 15 dissipated.
- the outer nozzle needle 5 has a stepped center bore 17 in which the inner nozzle needle 7 is guided.
- the inner nozzle needle 7 has essentially three different diameters, which are denoted by D 1 , D 2 and D 3 in FIG. 1 . Unless otherwise noted, the following relations apply: D 3 ⁇ D 2 and D 1 ⁇ D 2
- the inner nozzle needle 7 At its end on the combustion chamber side, the inner nozzle needle 7 has a first diameter D 1 which merges into a tip 19.
- the tip 19 of the inner nozzle needle 7 lies in the closed state on a first nozzle needle seat 21, which is present at the end of the stepped center bore 17 of the outer nozzle needle 5.
- a pressure shoulder 23 is formed on the inner nozzle needle 7 between the first diameter D 1 and the second diameter D 2 .
- This first pressure shoulder 23 delimits a first pressure chamber 25 formed by the stepped center bore 17 of the outer nozzle needle 5.
- the first pressure chamber 25 is supplied with fuel from the common rail 114 via a supply bore 27 in the outer nozzle needle 5 and the high pressure line 13.
- the inner nozzle needle 7 with its second diameter D 2 is sealingly guided in the stepped center bore 17 of the outer nozzle needle 5.
- the inner nozzle needle 7 has a third diameter D 3 , which is larger than the second diameter D 2 , and delimits a first control chamber 31.
- the inner nozzle needle 7 is also sealed with its third diameter D 3 the stepped center bore 17 of the outer nozzle needle 5 out.
- the closure piece 11 is also sealing in the stepped center bore 17 of the outer nozzle needle 5 introduced.
- the inner nozzle needle 7 can be relative to the closure piece 11 and the outer Move nozzle needle 5.
- the first control chamber 31 is via the high pressure line 13, in which there is a first inlet throttle 33 with which Common rail 114 hydraulically connected.
- a first Flow restrictor 35 and a first 2/2-way valve 37 is the first control room with the fuel return 15 hydraulically connectable.
- the outer nozzle needle 5 is guided in a stepped center bore 41 of the nozzle body 3 with its diameters D 4 and D 5 .
- the outer nozzle needle 5 together with the closure piece 11 and the stepped center bore 41 has a second control chamber 49.
- the second control chamber is via a second inlet throttle 51 49 hydraulically connected to the common rail 114.
- a second outlet throttle 53 and a second 2/2-way valve 55 is the second control room 49 with the Fuel return 15 connectable.
- the second inlet throttle 51 and the second discharge throttle 53 are in the Closure piece 11 arranged.
- the second spray holes 40 are arranged so that the Fuel in the direction of the longitudinal axis of the fuel injector 1 in the combustion chamber, not shown is injected (see also Figure 4).
- Light Deviations between the direction of the injected Fuel jet and the longitudinal axis of the fuel injector are also possible and partially desired.
- the Internal combustion engine an improved combustion and Emission behavior of the same can be achieved.
- the interior Nozzle needle 7 opened. It is also possible to start with the inner one Open nozzle needle 7 and with the inner one open Nozzle needle 7 also the outer nozzle needle 5 of her Jet needle seat lift off, making a big one Amount of fuel in the combustion chamber in a very short time is injected.
- FIG 2 is a second embodiment fuel injector 1 according to the invention also in Longitudinal section shown.
- the same components are included provided with the same reference numerals and the same applies with regard to Figure 1 said accordingly.
- Pressure intensifier 57 is provided between the high pressure line 13 and the first pressure chamber 25 .
- the pressure intensifier 57 consists essentially of a stepped piston 59, which on the one hand a low pressure chamber 61 and on the other hand one High pressure space 63 limited.
- the low pressure chamber 61 is over the high pressure line 13 with the common rail 114 hydraulic connected.
- the high-pressure chamber 63 is via a line 65, which through the connector 11, the nozzle body 3 and the outer nozzle needle 5 runs with the first pressure chamber 25 connected.
- the high pressure space 63 is filled via a Check valve 67, which is between high pressure line 13 and high pressure space 63 is arranged.
- a control room 69 of the pressure booster 57 is via a 3/2-way valve 71 either with the common rail 114 or the Fuel return 15 hydraulically connected.
- a closing spring 74 is provided, which the stepped piston 59 in that shown in Figure 2 Switch position of the 3/2-way valve 71 moves up what a reduction in the low pressure space 61 and a Enlargement of the high pressure space 63 causes.
- the 3/2-way valve 71 is switched so that the control room 69 is hydraulically connected to the fuel return 15, becomes the stepped piston 59 because the in the high pressure chamber 61st acting hydraulic forces are greater than those in High pressure chamber 63 acting hydraulic forces, after in Fig. 2 moves below.
- Embodiment of a fuel injector according to the invention 1 opens the inner nozzle needle 7 pressure controlled so that a first inlet throttle and a first flow restrictor are not necessary.
- the inner nozzle needle 7 has only two diameters (D 1 and D 2 ).
- the closing force is applied by the closing spring 73. This concept can also be used in the exemplary embodiment according to FIG. 1.
- the second control room 49 is in this Embodiment via a second inlet throttle 51 with Fuel supplied, the second inlet throttle 51 a hydraulic connection between the first control room 31 and second control room 49 produces.
- the embodiment is the closure piece 11 in two parts executed. This is indicated by reference numerals 11a and 11b in FIG Figure 2 indicated. Due to the two-part design of the Closure piece 11 may have a slight eccentricity stepped center bore 17 relative to the stepped Center bore 41 are compensated. Also simplified the manufacture of the closure piece 11.
- the outer nozzle needle 5 is opened by the second 2/2-way valve 55 is opened and thus via the second Flow restrictor 53 reduces pressure in the second control chamber 49 takes place. As soon as the second pressure shoulder 43 acting hydraulic force is greater than that of the second Control chamber 49 exerted on the outer nozzle needle 5 is hydraulic force, the outer nozzle needle 5 lifts from their nozzle needle seat in the nozzle body 3 and enables an injection.
- the high pressure line 13 is a combined one Check valve with a throttle connected in parallel, which in their entirety with the reference number 75 are marked, provided to pressure fluctuations in the Common rail 114 or in the fuel injector 1 decrease.
- FIG 3 is another embodiment inventive fuel injector 1 with Pressure intensifier 57 shown. Below are just the essential differences described and otherwise on the previously said.
- the first control chamber 31 via an in the outer nozzle needle 5 arranged first inlet throttle 33 with fuel provided.
- the first inlet throttle 33 is connected to the line 65 in connection, which the high pressure space 63 of the Pressure intensifier 57 connects to the first pressure chamber 25.
- the first outlet throttle 35 is connected via a line 77 to the Abstellraum 69 of the pressure booster 57 connected. This means that as soon as the 3/2-way valve 71 a hydraulic connection of fuel return 15 and Abstellraum 69 produces, also the pressure in the first Control chamber 31 drops and thus the inner nozzle needle 7 can open.
- the second inlet throttle 51 is in this Embodiment between the high pressure line 13 and the second control chamber 49 in the closure piece 11a arranged.
- the second outlet throttle 43 is also in the Closure piece 11a arranged.
- FIGS. 1 to 3 are different embodiments of Fuel injectors according to the invention simplified and shown enlarged.
- the magnifications shown are primarily intended to be different possible arrangements of second spray holes 40 in the fuel injector 1 according to the invention explained and being represented. All embodiments according to the Figures 4a to 4b can be detailed in each of the above explained embodiments according to FIGS. 1 to 3 be used.
- FIG. A is a second Nozzle needle seat 79 recognizable.
- the second nozzle needle seat 79 gives the line of contact between the outer nozzle needle 5 and Nozzle body 3 in the closed state of the fuel injection nozzle 1 on.
- the second spray holes 40 are at this embodiment by a cylindrical Annular gap between the nozzle body 3 and the outer Nozzle needle 5 formed. The second spray hole 40 is only released when the outer nozzle needle 5 from the nozzle body 3rd lifts off and thus releases the second nozzle needle seat 79.
- the fuel injection system 102 includes a fuel tank 104 from which fuel 106 passes through an electrical or mechanical fuel pump 108 is promoted. Via a low pressure fuel line 110 the fuel 106 becomes a high pressure fuel pump 111 funded. From the high pressure fuel pump 111 fuel 106 passes through a high pressure fuel line 112 to a common rail 114. On the Several fuel injection nozzles according to the invention are common rails 1 connected to the fuel 106 directly into combustion chambers 118 of a not shown Inject internal combustion engine.
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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
Description
- Figur 1
- ein erstes Ausführungsbeispiel einer erfindungsgemäßen Kraftstoff-Einspritzdüse im Längsschnitt,
- Figur 2
- ein zweites Ausführungsbeispiel einer erfindungsgemäßen Kraftstoff-Einspritzdüse mit Druckübersetzer,
- Figur 3
- ein drittes Ausführungsbeispiel einer erfindungsgemäßen Kraftstoff-Einspritzdüse,
- Figur 4
- Vergrößerte Darstellungen der Spritzlöcher von Ausführungsbeispielen erfindungsgemäßer Kraftstoff-Einspritzdüsen und
- Figur 5
- eine schematische Darstellung einer Kraftstoffeinspritzanlage mit erfindungsgemäßen Kraftstoff-Einspritzdüsen und
Claims (16)
- Kraftstoff-Einspritzdüse für eine Brennkraftmaschine mit einem in den Brennraum ragenden Düsenkörper (3), mit zwei koaxialen Düsennadeln (5, 7), wobei die äußere Düsennadel (5) im Düsenkörper (3) geführt ist, mit einem zweiten Düsennadelsitz im Düsenkörper (3) für die äußere Düsennadel (5) und mit einem ersten Düsennadelsitz für die innere Düsennadel (7) dadurch gekennzeichnet, dass die innere Düsennadel (7) in der äußeren Düsennadel (5) geführt wird, und dass der erste Düsennadelsitz (21) in der äußeren Düsennadel (5) angeordnet ist.
- Kraftstoff-Einspritzdüse nach Anspruch 1, dadurch gekennzeichnet, dass in der äußeren Düsennadel (5) ein mit einer ersten Druckschulter (23) der inneren Düsennadel (7) zusammenwirkender erster Druckraum (25) ausgebildet ist, und dass der erste Druckraum (25) über eine Versorgungsbohrung (27) in der äußeren Düsennadel (5) mindestens mittelbar mit dem Druck eines Common-Rails (114) beaufschlagt wird.
- Kraftstoff-Einspritzdüse nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die innere Düsennadel (7) mit ihrem dem Brennraum abgewandten Ende (29) einen in der äußeren Düsennadel (5) vorhandenen ersten Steuerraum (31) einenends begrenzt, und ein mit der äußeren Düsennadel (5) zusammenwirkendes Verschlussstück (11, 11a, 11b) den ersten Steuerraum (31) anderenends begrenzt.
- Kraftstoff-Einspritzdüse nach Anspruch 3, dadurch gekennzeichnet, dass der Durchmesser (D3) der inneren Düsennadel (7) an ihrem dem Brennraum abgewandten Ende (29) größer als der Durchmesser (D2) der ersten Druckschulter (23) der inneren Düsennadel (7) ist.
- Kraftstoff-Einspritzdüse nach Anspruch 3, dadurch gekennzeichnet, dass der Durchmesser (D3) der inneren Düsennadel (7) an ihrem dem Brennraum abgewandten Ende (29) gleich dem Durchmesser (D2) der ersten Druckschulter (23) der inneren Düsennadel (7) ist.
- Kraftstoff-Einspritzdüse nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass im ersten Steuerraum (31) eine Schließfeder (73) vorgesehen ist, die sich einenends an der inneren Düsennadel (7) und anderenends an dem Verschlussstück (11) abstützt.
- Kraftstoff-Einspritzdüse nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, dass der erste Steuerraum (31) über eine erste Zulaufdrossel (33) mit Kraftstoff aus dem Common-Rail (114) versorgt wird, und dass der erste Steuerraum (31) über eine erste Ablaufdrossel (35) und über ein erstes Wegeventil, insbesondere ein 2/2-Wegeventil (37), mit einem Kraftstoffrücklauf (15) hydraulisch in Verbindung steht.
- Kraftstoff-Einspritzdüse nach Anspruch 7, dadurch gekennzeichnet, dass die erste Zulaufdrossel (33) in dem Verschlussstück (11) oder in der äußeren Düsennadel (5) angeordnet ist.
- Kraftstoff-Einspritzdüse nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass die erste Ablaufdrossel (35) in dem Verschlussstück (11) angeordnet ist.
- Kraftstoff-Einspritzdüse nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die äußere Düsennadel (5) mit ihrem dem Brennraum abgewandten Ende (47) einenends einen in dem Düsenkörper (3) vorhandenen zweiten Steuerraum (49) begrenzt, und dass das Verschlussstück (11) den zweiten Steuerraum (49) anderenends begrenzt.
- Kraftstoff-Einspritzdüse nach Anspruch 10, dadurch gekennzeichnet, dass der zweite Steuerraum (49) über eine zweite Zulaufdrossel (51) mit Kraftstoff aus dem Common-Rail (114) versorgt wird, und dass der zweite Steuerraum (49) über eine zweite Ablaufdrossel (53) und über ein zweites Wegeventil, insbesondere ein 2/2-Wegeventil (55), mit dem Kraftstoffrücklauf (15) hydraulisch in Verbindung steht.
- Kraftstoff-Einspritzdüse nach Anspruch 10, dadurch gekennzeichnet, dass der zweite Steuerraum (49) über die Versorgungsböhrung (27), den ersten Steuerraum (31) und die zweite Zulaufdrossel (51) mit Kraftstoff aus dem Common-Rail (114) versorgt wird, dass der zweite Steuerraum (49) über die zweite Ablaufdrossel (53) und über das zweite Wegeventil, insbesondere ein 2/2-Wegeventil (55), mit dem Kraftstoffrücklauf (15) hydraulisch in Verbindung steht, und dass der erste Druckraum (25) mit einem Druck beaufschlagbar ist, welcher größer als der Druck im Common-Rail (114) ist.
- Kraftstoff-Einspritzdüse nach Anspruch 12, dadurch gekennzeichnet, dass zwischen Common-Rail (114) und erstem Druckraum (25) ein hydraulischer Druckübersetzer (57) vorhanden ist, dass ein Niederdruckraum (61) des Druckübersetzers (57) mit dem Common-Rail (114) hydraulisch in Verbindung steht, dass ein Hochdruckraum (63) des Druckübersetzers (57) mit dem ersten Druckraum (25) hydraulisch in Verbindung steht, und dass der Druck in einem Absteuerraum (69) des Druckübersetzers (57) über ein 3/2-Wegeventil (71) entweder mit dem Common-Rail (114) oder dem Kraftstoffrücklauf (15) verbindbar ist.
- Kraftstoff-Einspritzdüse nach Anspruch 13, dadurch gekennzeichnet, dass zwischen Common-Rail (114) und Hochdruckraum (63) des Druckübersetzers (57) eine hydraulische Verbindung mit einem Rückschlagventil (67) vorgesehen ist.
- Kraftstoff-Einspritzdüse nach einem der Ansprüche 12 bis 14, dadurch gekennzeichnet, dass die zweite Zulaufdrossel (53) in dem Verschlussstück (11) angeordnet ist.
- Kraftstoff-Einspritzdüse nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Wegeventile (37, 55, 71) durch einen Elektromagneten oder einen Piezo-Aktor betätigt werden.
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DE10300045 | 2003-01-03 | ||
DE10300045A DE10300045A1 (de) | 2003-01-03 | 2003-01-03 | Nach innen öffnende Variodüse |
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EP1435453A1 true EP1435453A1 (de) | 2004-07-07 |
EP1435453B1 EP1435453B1 (de) | 2007-06-06 |
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EP03020865A Expired - Lifetime EP1435453B1 (de) | 2003-01-03 | 2003-09-15 | Nach innen öffnende Variodüse |
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US (1) | US6918377B2 (de) |
EP (1) | EP1435453B1 (de) |
DE (2) | DE10300045A1 (de) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2005040594A1 (de) * | 2003-10-24 | 2005-05-06 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für brennkraftmaschinen |
EP1584813A3 (de) * | 2004-04-08 | 2006-03-29 | Robert Bosch Gmbh | Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen mit direkt ansteuerbaren Düsennadeln |
EP1795736A2 (de) * | 2005-12-12 | 2007-06-13 | Robert Bosch Gmbh | Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine |
WO2008004019A1 (en) * | 2006-07-04 | 2008-01-10 | Renault Trucks | A nozzle assembly, a fuel injector and an internal combustion engine comprising such an injector |
WO2008122882A2 (en) * | 2007-04-10 | 2008-10-16 | Toyota Jidosha Kabushiki Kaisha | Fuel injection control device and method of controlling fuel injection for an internal combustion engine |
CN108138732A (zh) * | 2015-09-23 | 2018-06-08 | 罗伯特·博世有限公司 | 用于配量燃料的设备 |
WO2019219381A1 (de) * | 2018-05-16 | 2019-11-21 | Robert Bosch Gmbh | Verfahren zum betreiben eines kraftstoffinjektors |
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US6725838B2 (en) * | 2001-10-09 | 2004-04-27 | Caterpillar Inc | Fuel injector having dual mode capabilities and engine using same |
JP4066959B2 (ja) * | 2004-01-27 | 2008-03-26 | 株式会社デンソー | 燃料噴射装置 |
DE102004024527A1 (de) * | 2004-05-18 | 2005-12-15 | Robert Bosch Gmbh | Kraftstoffeinspritzeinrichtung |
DE102004038189A1 (de) * | 2004-08-06 | 2006-03-16 | Robert Bosch Gmbh | Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen mit direkt ansteuerbaren Düsennadeln |
DE102005010453A1 (de) * | 2005-03-08 | 2006-09-14 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für Brennkraftmaschinen |
US7597084B2 (en) * | 2005-03-09 | 2009-10-06 | Caterpillar Inc. | Internal combustion engine and operating method therefor |
US8069835B2 (en) * | 2005-03-09 | 2011-12-06 | Caterpillar Inc. | Internal combustion engine and operating method therefor |
DE602006008377D1 (de) * | 2005-04-28 | 2009-09-24 | Delphi Tech Inc | Einspritzdüse |
EP1717435B1 (de) * | 2005-04-28 | 2009-08-12 | Delphi Technologies, Inc. | Einspritzdüse |
DE102005037956A1 (de) * | 2005-08-11 | 2007-02-15 | Robert Bosch Gmbh | Geteiltes Einspritzventilglied mit Doppelsitz |
US7740001B2 (en) * | 2006-03-10 | 2010-06-22 | Volvo Lastvagnar Ab | Fuel injection system |
US20080296412A1 (en) * | 2007-06-01 | 2008-12-04 | Caterpillar Inc. | Fuel injector having a flow passage insert |
DE102007028091A1 (de) * | 2007-06-20 | 2008-12-24 | Daimler Ag | Kraftstoffversorgungssystem |
US7685990B2 (en) * | 2007-11-29 | 2010-03-30 | Delphi Technologies, Inc. | Dual mode combustion apparatus and method |
US10982635B2 (en) * | 2012-05-29 | 2021-04-20 | Delphi Technologies Ip Limited | Fuel injector and method for controlling the same |
HUE027556T2 (en) * | 2012-06-13 | 2016-10-28 | Delphi Int Operations Luxembourg Sarl | atomizer |
US9068539B2 (en) * | 2012-08-03 | 2015-06-30 | Caterpillar Inc. | Dual check fuel injector and fuel system using same |
US9695790B2 (en) * | 2013-07-01 | 2017-07-04 | Volvo Truck Corporation | Hydraulic system |
US9920674B2 (en) | 2014-01-09 | 2018-03-20 | Cummins Inc. | Variable spray angle injector arrangement |
JP6562028B2 (ja) * | 2017-04-11 | 2019-08-21 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
EP3234340B1 (de) * | 2014-12-19 | 2020-07-08 | Volvo Truck Corporation | Einspritzsystem eines verbrennungsmotors und automobilfahrzeug mit solch einem einspritzsystem |
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- 2003-09-15 DE DE50307415T patent/DE50307415D1/de not_active Expired - Lifetime
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EP1035322A2 (de) * | 1999-03-09 | 2000-09-13 | Delphi Technologies, Inc. | Kraftstoffeinspritzventil |
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Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005040594A1 (de) * | 2003-10-24 | 2005-05-06 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für brennkraftmaschinen |
EP1584813A3 (de) * | 2004-04-08 | 2006-03-29 | Robert Bosch Gmbh | Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen mit direkt ansteuerbaren Düsennadeln |
EP1795736A2 (de) * | 2005-12-12 | 2007-06-13 | Robert Bosch Gmbh | Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine |
EP1795736A3 (de) * | 2005-12-12 | 2009-03-25 | Robert Bosch Gmbh | Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine |
WO2008004019A1 (en) * | 2006-07-04 | 2008-01-10 | Renault Trucks | A nozzle assembly, a fuel injector and an internal combustion engine comprising such an injector |
US8286613B2 (en) | 2006-07-04 | 2012-10-16 | Renault Trucks | Nozzle assembly a fuel injector and an internal combustion engine comprising such an injector |
WO2008122882A2 (en) * | 2007-04-10 | 2008-10-16 | Toyota Jidosha Kabushiki Kaisha | Fuel injection control device and method of controlling fuel injection for an internal combustion engine |
WO2008122882A3 (en) * | 2007-04-10 | 2008-12-04 | Toyota Motor Co Ltd | Fuel injection control device and method of controlling fuel injection for an internal combustion engine |
CN108138732A (zh) * | 2015-09-23 | 2018-06-08 | 罗伯特·博世有限公司 | 用于配量燃料的设备 |
US10704515B2 (en) | 2015-09-23 | 2020-07-07 | Robert Bosch Gmbh | Device for metering fuel |
WO2019219381A1 (de) * | 2018-05-16 | 2019-11-21 | Robert Bosch Gmbh | Verfahren zum betreiben eines kraftstoffinjektors |
Also Published As
Publication number | Publication date |
---|---|
DE10300045A1 (de) | 2004-07-15 |
EP1435453B1 (de) | 2007-06-06 |
DE50307415D1 (de) | 2007-07-19 |
US20040134465A1 (en) | 2004-07-15 |
US6918377B2 (en) | 2005-07-19 |
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