EP1727977A1 - Kraftstoffeinspritzventil - Google Patents
KraftstoffeinspritzventilInfo
- Publication number
- EP1727977A1 EP1727977A1 EP05701507A EP05701507A EP1727977A1 EP 1727977 A1 EP1727977 A1 EP 1727977A1 EP 05701507 A EP05701507 A EP 05701507A EP 05701507 A EP05701507 A EP 05701507A EP 1727977 A1 EP1727977 A1 EP 1727977A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle needle
- fuel
- outer nozzle
- pressure
- throttle
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
- F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
- F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
- F02M45/08—Injectors peculiar thereto
- F02M45/086—Having more than one injection-valve controlling discharge orifices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/46—Valves, e.g. injectors, with concentric valve bodies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
Definitions
- the invention is based on a fuel injection valve of an internal combustion engine according to the type defined in more detail in the preamble of claim 1.
- Such a fuel injection valve is known from DE 102 05 970 AI and is used to inject fuel under high pressure into a combustion chamber of a motor vehicle internal combustion engine.
- the fuel injector known from DE 102 05 970 AI comprises a housing with a nozzle module and a valve control module.
- the valve control module is designed like a valve and can be actuated by means of an actuator acting on a valve closing element. Depending on the switching position of the valve closing element, a pressure level can be set in a valve control chamber which borders on a needle unit of the nozzle module.
- the needle unit comprises an outer nozzle needle which is biased in the closing direction by means of a compression spring and is guided on the housing. An inner nozzle needle is guided in the outer nozzle needle.
- the inner nozzle needle is used to control one Injection of fuel via inner injection openings and the outer nozzle needle is used to control an injection via outer injection openings, with the outer nozzle needle and subsequently the inner nozzle needle being moved into the open position when the pressure in the valve control module is reduced by means of the valve control module. In the event of a subsequent pressure increase in the valve control chamber triggered by the valve control module, the two nozzle needles are moved simultaneously into the closed position.
- the fuel injector according to the invention with the features according to the preamble of claim 1 and an outer nozzle needle with at least one transverse channel, via which fuel can be guided to the periphery and to an inner pressure stage of the inner nozzle needle, offers the possibility of opening the needle unit first by opening the inner nozzle needle and then open the outer nozzle needle.
- By appropriately designing the pressure levels of the inner and outer nozzle needles optimized opening and closing speeds of the two nozzle needles can then be achieved.
- this concept in which the outer nozzle needle is preferably guided in a sleeve, which is arranged in the high-pressure chamber connected to the fuel supply channel, enables a leak-free fuel injection valve with two nozzle needles guided one inside the other.
- the fuel injection valve according to the invention can in particular be part of a common rail injection system and can be used to inject fuel under high pressure into a combustion chamber of a diesel engine of a motor vehicle.
- the fuel injection valve is connected on the inlet side to a high-pressure accumulator, the so-called Co mon-Rail, which supplies all fuel injection valves of the internal combustion engine in question with fuel under high pressure.
- the transverse channel of the outer nozzle needle can be provided with a throttle for precise adjustment of a fuel pressure acting on the inner pressure stage of the inner nozzle needle.
- the inner nozzle needle In order to be able to hold the inner nozzle needle in the closed position, it is expediently prestressed in the closing direction by means of a closing spring.
- the closing spring is supported, for example, on an intermediate plate of a housing of the fuel injection valve.
- the outer nozzle needle is advantageously biased in the closing direction by means of a further closing spring.
- a driver is advantageously formed on the inner nozzle needle, which acts on the outer nozzle needle.
- the driver is formed, for example, by the internal pressure stage.
- the inner nozzle needle can be designed such that in the open state it acts as a throttle for a fuel inflow into the valve control chamber and thus accelerates a lowering of the pressure level in the valve control chamber and thus accelerates the opening of the outer nozzle needle.
- a fuel throttle is arranged in the fuel supply channel of the injection valve.
- FIG. 1 shows a partial, schematic longitudinal section through a fuel injection valve with an inner and an outer nozzle needle
- FIG. 2 is a diagram that shows, for example, an opening pressure of the inner nozzle needle and the outer nozzle needle as a function of the diameter of the inner nozzle needle
- FIG. 3 is a diagram showing a needle stroke of the inner and the outer nozzle needle as a function of a control time.
- FIG. 1 shows a fuel injection valve 10 which is part of a so-called common rail injection system and is used for injecting fuel into a combustion chamber of a diesel engine of a motor vehicle.
- the essential components of the fuel injection valve 10 include a valve control module 12 and a nozzle module 14.
- a throttle plate 16 is arranged between the nozzle module 14 and the valve control module 12.
- the nozzle module 14 is designed as a so-called coaxial vario nozzle and has a needle unit 18, which is arranged in a high-pressure chamber 20 of a nozzle housing 22 and comprises an outer nozzle needle 24 and an inner nozzle needle 26.
- the outer nozzle needle 24 is in a high arranged pressure chamber 20, cylindrical sleeve 28 and is used to control outer, leading to the combustion chamber of the internal combustion engine injection holes or injection openings 32.
- the inner nozzle needle 26 is guided over a region 54 of enlarged diameter in the outer nozzle needle 24 and serves to control inner , also leading to the combustion chamber of the internal combustion engine spray holes or injection openings 34.
- the inner spray holes 34 each have a smaller cross section than the outer spray holes 32.
- the two nozzle needles 24 and 26 border with their end faces facing away from the spray holes 32 and 34 to a valve control chamber 36 which is delimited radially by the cylindrical sleeve 28 and on the side facing away from the nozzle needles 24 and 26 by the throttle plate 16.
- the position of the two nozzle needles 24 and 26 can be adjusted via the fluid pressure prevailing in the valve control chamber 36.
- the outer nozzle needle 24 is biased in the closing direction by means of a first closing spring 38, which is supported on the sleeve 28 and engages on a support 40 of the outer nozzle needle 24.
- the inner nozzle needle 26 is pretensioned in the closing direction by means of a second closing spring 42, which is supported on the throttle plate 16 and engages on a support 44 of the inner nozzle needle 26 formed by the region 54 of enlarged diameter.
- the outer nozzle needle 24 also has a transverse channel 46, which connects the high-pressure chamber 20 with an annular gap 48 connects between the outer nozzle needle 24 and the circumference of the inner nozzle needle 26 and with an inner pressure stage 50 of the inner nozzle needle 26.
- the pressure stage 50 is formed by the area 54 of enlarged diameter of the inner nozzle needle 26.
- a throttle 52 is formed in the transverse channel 46.
- the outer nozzle needle 24 has a double seat 56 on its end face facing away from the valve control chamber 36, by means of which the outer spray holes 32 can be closed. On this side, the outer nozzle needle 24 is also provided with an outer pressure stage 58.
- the throttle plate 16 has a fuel throttle 60, which is assigned to a fuel supply channel 62 leading to the high-pressure chamber 20, a so-called inlet throttle 64 arranged between the fuel supply channel 62 and the valve control chamber 36, one between the valve control chamber 36 and a valve chamber 66 of the nozzle module 12 arranged, so-called discharge throttle 68 and a bypass channel 70, which is connected via a channel 72 to the fuel supply channel 62 and also leads to the valve control chamber 66.
- a fuel throttle 60 which is assigned to a fuel supply channel 62 leading to the high-pressure chamber 20, a so-called inlet throttle 64 arranged between the fuel supply channel 62 and the valve control chamber 36, one between the valve control chamber 36 and a valve chamber 66 of the nozzle module 12 arranged, so-called discharge throttle 68 and a bypass channel 70, which is connected via a channel 72 to the fuel supply channel 62 and also leads to the valve control chamber 66.
- the inlet throttle 64 is arranged centrally in the throttle plate 16, whereas the outlet throttle 68 is arranged eccentrically.
- a valve closing member 74 is arranged, which by means of a preferably piezoelectric actuator, not shown here, preferably is controllable.
- the valve closing member 74 is biased in the closing direction by means of a biasing spring 76.
- An inflow of fuel to the spray holes 34 takes place from the fuel supply channel 62 via the fuel throttle 60, past the sleeve 28 into the high-pressure chamber 20 and then through the transverse channel 46 or the throttle 52 to the outside of the inner nozzle needle 26 and from there when the needle is open inner nozzle needle 26 to the spray holes 34.
- the inner nozzle needle 26 and the outer nozzle needle 24 are held in the closed position by the respectively associated closing spring 42 or 38 and by the hydraulic pressure conditions when the piezoelectric actuator is not activated.
- the pressure areas of the inner nozzle needle 26 and the outer nozzle needle 24, i. H. the end faces of the two nozzle needles 24 and 26 facing away from the spray holes 32 and 34 as well as the inner pressure stage 50 of the inner nozzle needle 26 and the outer pressure stage 58 of the outer nozzle needle 24 are coordinated such that the opening pressure prevailing in the valve control chamber 36 is greater for the inner nozzle needle 26 is than the opening pressure prevailing in the valve control chamber 36 for the outer nozzle needle 24, which is shown by way of example with reference to FIG. 2.
- FIG. 2 shows, using a dashed curve for the inner nozzle needle 26 and using a solid curve for the outer nozzle needle 24, an opening pressure p which must prevail in the valve control chamber 36 in order to open the inner nozzle needle 26 and the outer nozzle needle 24, the opening pressure p in Dependence on the diameter D of the inner nozzle needle 26 is shown.
- the inner nozzle needle 26 has a seat diameter of 1.3 mm
- the outer nozzle needle 24 has a seat diameter of 1.8 mm
- the outer needle has a diameter of 4 mm
- a rail pressure of 1 kbar being provided in the fuel supply line 62 and in the relevant one Combustion chamber there is a pressure of 50 bar.
- the inner nozzle needle 26 must have a diameter of more than 2.45 mm in order to have the inner nozzle needle 26 open in front of the outer nozzle needle 24. This means that only from this diameter D of the inner nozzle needle 26 is the opening pressure of the inner nozzle needle 26 greater than the opening pressure of the outer nozzle needle 24.
- FIG. 3 shows a simulation of a stroke H for an inner nozzle needle based on a curve X and a stroke H for an outer nozzle needle based on a curve Y for a fuel injection valve of the type shown in FIG. 1, each as a function of a triggering time of the piezoelectric actuator.
- the diagram shown in FIG. 3 shows that the inner nozzle needle opens at an earlier point in time than the outer nozzle needle, so that fuel can be injected into the combustion chamber of the internal combustion engine in a staged manner via the respectively assigned injection holes 32 and 34.
- the fuel injection valve 10 shown in Figure 1 operates in the manner described below.
- the piezoelectric actuator In the initial state, the piezoelectric actuator is in a de-energized state, so that the valve closing member 74 is in the closed position and rail pressure prevails in the valve control chamber 36.
- the valve closing member 74 When the piezoelectric actuator is activated, the valve closing member 74 is moved into the open position, so that the fluid pressure in the valve control chamber 36 is reduced via the outlet throttle 68.
- the fluid pressure prevailing in the valve control chamber 36 has dropped to the opening pressure required to open the inner nozzle needle 26, the latter opens.
- the total stroke of the inner nozzle needle 26 is, for example, 0.2 mm, the throttle plate 16 forming a stop. After covering its entire stroke, the inner nozzle needle strikes the throttle plate 18, whereupon the inner nozzle needle 26 largely throttles the inflow of fuel via the inlet throttle 64 into the valve control chamber 36.
- valve closing member 74 When an injection of fuel into the combustion chamber is to be ended, the valve closing member 74 is moved into the closed position by means of the piezoelectric actuator, so that the pressure in the valve control chamber 36 rises again to the rail pressure. At this point in time High pressure chamber 20 pressure prevailing due to the throttling by means of the fuel throttle 60 is lower than the rail pressure. Due to the different pressure levels in the valve chamber 36 and the high-pressure chamber 20, a closing force is exerted on both needles. Because the pressure stage 50 acts as a driver, the inner nozzle needle 26 and the outer nozzle needle 24 close essentially simultaneously.
- the piezoelectric actuator is moved into an intermediate position, as a result of which, due to the action of the fuel flowing into the valve chamber 66 via the bypass channel, the pressure in the valve control chamber 36 does not drop to such an extent that the outer nozzle needle 24 opens. Opening of the outer nozzle needle 24 can also be prevented by multiple energization of the piezoelectric actuator.
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)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004011095A DE102004011095A1 (de) | 2004-03-06 | 2004-03-06 | Kraftstoffeinspritzventil |
PCT/EP2005/050122 WO2005085624A1 (de) | 2004-03-06 | 2005-01-13 | Kraftstoffeinspritzventil |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1727977A1 true EP1727977A1 (de) | 2006-12-06 |
EP1727977B1 EP1727977B1 (de) | 2008-03-19 |
Family
ID=34877505
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05701507A Not-in-force EP1727977B1 (de) | 2004-03-06 | 2005-01-13 | Kraftstoffeinspritzventil |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1727977B1 (de) |
AT (1) | ATE389796T1 (de) |
DE (2) | DE102004011095A1 (de) |
WO (1) | WO2005085624A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006037175A1 (de) * | 2006-08-09 | 2008-02-14 | Robert Bosch Gmbh | Kraftstoffinjektor mit verbessert geführter Hubbewegung des Ventilschließgliedes |
DE102006051583A1 (de) * | 2006-11-02 | 2008-05-08 | Robert Bosch Gmbh | Kraftstoffinjektor mit Speichervolumensegment |
GB0801997D0 (en) | 2007-05-01 | 2008-03-12 | Delphi Tech Inc | Fuel injector |
DE102009046336A1 (de) | 2009-11-03 | 2011-05-05 | Robert Bosch Gmbh | Ventilanordnung eines Kraftstoffinjektors |
US8690075B2 (en) * | 2011-11-07 | 2014-04-08 | Caterpillar Inc. | Fuel injector with needle control system that includes F, A, Z and E orifices |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5899389A (en) * | 1997-06-02 | 1999-05-04 | Cummins Engine Company, Inc. | Two stage fuel injector nozzle assembly |
US6705543B2 (en) * | 2001-08-22 | 2004-03-16 | Cummins Inc. | Variable pressure fuel injection system with dual flow rate injector |
DE10155227A1 (de) * | 2001-11-09 | 2003-05-22 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
DE10205970A1 (de) * | 2002-02-14 | 2003-09-04 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
DE10254186A1 (de) * | 2002-11-20 | 2004-06-17 | Siemens Ag | Injektor mit einer direkt angetriebenen Register-Düsennadel für die Kraftstoffeinspritzung in einen Verbrennungsmotor |
-
2004
- 2004-03-06 DE DE102004011095A patent/DE102004011095A1/de not_active Withdrawn
-
2005
- 2005-01-13 AT AT05701507T patent/ATE389796T1/de not_active IP Right Cessation
- 2005-01-13 EP EP05701507A patent/EP1727977B1/de not_active Not-in-force
- 2005-01-13 WO PCT/EP2005/050122 patent/WO2005085624A1/de active IP Right Grant
- 2005-01-13 DE DE502005003321T patent/DE502005003321D1/de active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2005085624A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE389796T1 (de) | 2008-04-15 |
WO2005085624A1 (de) | 2005-09-15 |
DE502005003321D1 (de) | 2008-04-30 |
DE102004011095A1 (de) | 2005-09-22 |
EP1727977B1 (de) | 2008-03-19 |
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