EP1126160B1 - Einspritzventil für die Einspritzung von Kraftstoff in eine Verbrennungskraftmaschine - Google Patents
Einspritzventil für die Einspritzung von Kraftstoff in eine Verbrennungskraftmaschine Download PDFInfo
- Publication number
- EP1126160B1 EP1126160B1 EP01102406A EP01102406A EP1126160B1 EP 1126160 B1 EP1126160 B1 EP 1126160B1 EP 01102406 A EP01102406 A EP 01102406A EP 01102406 A EP01102406 A EP 01102406A EP 1126160 B1 EP1126160 B1 EP 1126160B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- throttle
- injection
- diameter
- fuel
- inlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000446 fuel Substances 0.000 title claims description 27
- 238000002485 combustion reaction Methods 0.000 title claims description 15
- 238000002347 injection Methods 0.000 claims description 49
- 239000007924 injection Substances 0.000 claims description 49
- 239000012530 fluid Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 230000003455 independent Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
Images
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
- 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
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
-
- 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
- F02M45/12—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship providing a continuous cyclic delivery with variable 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
- F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
Definitions
- the invention relates to an injection valve for injection of fuel in an internal combustion engine according to the preamble of claim 1
- Such injection valve is for example from the EP-A-0 192 241 or GB-A-2 336 627.
- Such injectors are for Control the fluid flows provided with servo valves.
- injection systems For the fuel supply of internal combustion engines increasingly used in storage injection systems with which worked very high injection pressures.
- Such injection systems are as common-rail systems (for diesel engines) and HPDI injection systems (for gasoline engines) known.
- injection systems use fuel with a high-pressure pump in one common to all cylinders of the engine Accumulator conveys, from there to the injectors The individual cylinders are supplied with fuel.
- the Opening and closing of the injectors is doing in the Usually electromagnetically or piezoelectrically operated Actuators controlled.
- the injectors are in such systems equipped with servovalves opening hydraulically and closing the injector nozzle needle, that means in particular the beginning and the end of the injection process timed.
- the servo valve influences this in conjunction with control chokes especially the speed, with which the injection valve opens and closes.
- the speed, with which the injector opens be different from that Speed at which the injector closes.
- the Injector should e.g. in common-rail systems for diesel engines at the beginning of the injection for a better mixing slowly open the fuel with the air controlled, whereas the injection valve at the end of the injection process must close quickly to prevent soot formation.
- Servo valves for common rail systems are usually considered 2/2-way valves or 3/2-way valves executed.
- the version as 2/2-way valve with an inlet throttle and an outlet throttle has the disadvantage that the Opening and closing operations of the injection valve by the embodiment the fuel inlet and the fuel drain only within change very narrow boundaries.
- a servo valve for controlling Fluid streams known in which the in a first fluid chamber pressure applied to the valve body of the servo valve Opening and closing the servo valve causes.
- the operation of the servo valve has the opening or closing of a separate Fluid channels result.
- This fluid channel leads from a Master cylinder, which exerts pressure on the fluid, to secondary cylinders, which are actuated by the pressurized fluid.
- This known arrangement in which the master cylinder a Master cylinder of a motor vehicle and the secondary cylinder Represent wheel brake cylinder, should serve to the Fluid channel of an antilock system in rapid succession delay can be opened and closed.
- GB-A-2 336 627 discloses a servo valve for control of fluid flows, in which the speed with which the Nozzle needle releases the injection holes or closes over the ratio of inlet diameter and outlet diameter the inlet throttle and / or the outlet throttle adjustable is, wherein both throttles a ratio of inlet diameter have to drainage diameter of 1.
- the invention is based on the object To design injection valve in that it has an improved Allows for very small quantity injection.
- the fuel is at system pressure from a high-pressure accumulator, not shown above a high pressure bore and one provided with an inlet throttle 2 Inlet bore 3 a control chamber 4 in the injection valve housing 5 supplied.
- a control chamber 4 in the injection valve housing 5 supplied.
- the injection holes 8 are in the open injection valve with a nozzle chamber 9 in conjunction, in turn, over the high pressure bore 1 connected to the high pressure accumulator is. If both in the control room 4 and in the nozzle chamber 9, the full system pressure is applied, the nozzle needle 6 due pressed down the larger effective area in the control room 4, so that the injection holes 8 are closed.
- an injection valve According to the prior art leads from the control chamber 4 a hole 10 in the injection valve housing 5 with an outlet throttle 11 to a valve integrated in the injector 5 servo valve 12 in the form of a 2/2-way valve. From the servovalve 12 leads a pressureless fuel return 13 to the not shown Fuel tank. The servo valve 12 switches via a Plunger 14, of an electromagnetic and / or piezoelectric actuator 15 is driven.
- the servo valve 12 has the task to control the pressure, the in the control chamber 4 for opening and closing the injector is exerted on the axially movable nozzle needle 6.
- the trained as cylindrical holes Inlet and outlet throttles 2 and 11 are dimensioned so that the pressure in the control chamber 4 decreases. Through this Pressure reduction takes the force acting on the nozzle needle 6 force while the pressure in the nozzle chamber 9 equals the system pressure remains so that the injector through the in the nozzle chamber 9 force acting on the nozzle needle 6 hydraulic is opened. By this displacement of the nozzle needle 6 is the connection of the nozzle chamber 9 with the injection holes. 8 restored and the fuel returned to the combustion chamber injected.
- This known embodiment of an injection valve with a 2/2-way valve as a servo valve 12 has the disadvantage that The opening and closing operations only within very narrow Limits can be influenced independently of each other.
- FIG. 2 shows a nozzle-shaped inlet throttle 2, at the ratio of the inlet diameter 16 to the outlet diameter 17 is greater than 1, that is, that the cross section the inlet throttle 2 in the direction of the arrow 18 marked flow direction decreases.
- the inlet throttle 2 as a nozzle-shaped throttle is proposed the outlet throttle 11 with an increasing in the flow direction Cross-section diffuser-like form, the Ratio of inlet diameter 16 to the outlet diameter 17 now less than 1. This will cause the point (cavitation turnaround point, KUP), in which the fuel flow through the outlet throttle 11 is independent of the pressure difference between the inlet and the outlet of the outlet throttle, at a achieved lower pressure difference.
- KUP cavitation turnaround point
- the ratio of inlet diameter 16 to the outlet diameter 17 of the inlet throttle 2 and / or the outlet throttle 11 is 0.7 to 1.3.
- the ratio of inlet diameter 16 to the outlet diameter 17 of the inlet throttle 2 is preferably about 1.3: 1.
- the ratio of inlet diameter to outlet diameter the outlet throttle is preferably about 0.7: 1.
- Figure 3 shows the influence of the throttle shape on the Kavitations-Umtschtician (KUP).
- KUP Kavitations-Umtschtician
- the inflow condition can be in the inlet throttle. 2 improve by a corresponding rounding of the leading edge, which is particularly advantageous in rising Rail Ben affects. Since the smallest quantity injection the more becomes more difficult, the greater the rail pressure becomes, affects the rounding of the inlet edge positive to the smallest quantity injection out.
- the nozzle shape of the inlet throttle 2 together with the rounding of the leading edge effect a fast Closing and slowly opening the nozzle needle tip 7, as required for optimal combustion conditions becomes.
- Figure 4 shows the flow rate of the inlet throttle 2 in dependence the cross-sectional shape of the throttle.
- the nozzle shape is at low Rail However only slightly effective, resulting in a steeper Opening edge results, in turn, for a stable Opening at low pressures is required.
Description
- Figur 1
- einen schematischen Aufbau eines Einspritzventils gemäß dem Stand der Technik mit einem 2/2-Wegeventil als Servoventil;
- Figur 2
- schematisch die Ausgestaltung einer düsenförmig ausgebildeten Zulaufdrossel eines erfindungsgemäßen Einspritzventils;
- Figur 3
- eine graphische Darstellung der Abhängigkeit des Kavitations-Umschlagpunktes (KUP) von der Formgebung des Zu- und Ablaufdurchmessers einer Drossel und
- Figur 4
- eine graphische Darstellung der Abhängigkeit des Durchflusses der Zulaufdrossel von der geometrischen Form der Drossel.
Claims (4)
- Einspritzventil für die Einspritzung von Kraftstoff in eine Brennkraftmaschine, mit einem Servoventil (12) zur Steuerung der Kraftstoffeinspritzung und mit einem Steuerraum (4), der über eine Zulaufdrossel (2) mit einem Kraftstoffzulauf in Verbindung steht und der über eine Ablaufdrossel (11) mit einem drucklosen Kraftstoff-Rücklauf (13) in Verbindung bringbar ist, wobei der im Steuerraum (4) herrschende Druck auf eine bewegliche Düsennadel (6) wirkt, der mit einer Düsennadelspitze (7) in Wirkverbindung steht, die bei der Bewegung der Düsennadel (6) Einspritzlöcher (8) freigibt oder verschließt, wobei das Servoventil (12) von einem Aktor (15) betätigt wird und zwischen einer die Ablaufdrossel (11) mit dem drucklosen Kraftstoff-Rücklauf (13) in Verbindung bringende Offenstellung und einer diese Verbindung versperrenden Schließstellung verstellbar ist,
dadurch gekennzeichnet, dass die Geschwindigkeit, mit der die Düsennadel (6) die Einspritzlöcher (8) freigibt oder verschließt, durch eine düsenförmige Zulaufdrossel (2) mit einem Verhältnis von Zulaufdurchmesser (16) zu Ablaufdurchmesser (17), das größer 1 ist, und/oder durch eine diffusorartige Ablaufdrossel (11) mit einem Verhältnis von Zulaufdurchmesser (16) zu Ablaufdurchmesser (17), das kleiner 1 ist, eingestellt wird. - Einspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass das Verhältnis von Zulaufdurchmesser (16) zu Ablaufdurchmesser (17) der Zulaufdrossel (2) größer als 1 bis maximal 1,3 ist.
- Einspritzventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Verhältnis von Zulaufdurchmesser (16) zu Ablaufdurchmesser (17) der Ablaufdrossel (11) kleiner als 1 bis minimal 0,7 ist.
- Einspritzventil nach mindestens einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Einlaufkante der Zulaufdrossel (2) abgerundet ausgebildet ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10007175A DE10007175B9 (de) | 2000-02-17 | 2000-02-17 | Einspritzventil für die Einspritzung von Kraftstoff in eine Verbrennungskraftmaschine |
DE10007175 | 2000-02-17 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1126160A2 EP1126160A2 (de) | 2001-08-22 |
EP1126160A3 EP1126160A3 (de) | 2003-09-24 |
EP1126160B1 true EP1126160B1 (de) | 2005-04-20 |
Family
ID=7631258
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01102406A Expired - Lifetime EP1126160B1 (de) | 2000-02-17 | 2001-02-02 | Einspritzventil für die Einspritzung von Kraftstoff in eine Verbrennungskraftmaschine |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1126160B1 (de) |
DE (2) | DE10007175B9 (de) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10015740C2 (de) * | 2000-03-29 | 2003-12-18 | Siemens Ag | Einspritzventil für die Einspritzung von Kraftstoff in eine Verbrennungskraftmaschine |
DE10033428C2 (de) * | 2000-07-10 | 2002-07-11 | Bosch Gmbh Robert | Druckgesteuerter Injektor zum Einspritzen von Kraftstoff |
DE10152173A1 (de) * | 2001-10-23 | 2003-04-30 | Bosch Gmbh Robert | Magnetventil zur Steuerung eines Einspritzventils |
DE10254300A1 (de) * | 2002-11-21 | 2004-06-03 | Robert Bosch Gmbh | Kraftstoffeinspritzventil einer Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine |
DE102004037125A1 (de) * | 2004-07-30 | 2006-03-23 | Robert Bosch Gmbh | Common-Rail-Injektor |
DE102004042352B4 (de) | 2004-08-20 | 2007-08-09 | Siemens Ag | Kraftstoffinjektor für eine Brennkraftmaschine |
DE102004058715B4 (de) * | 2004-12-06 | 2010-08-12 | Continental Automotive Gmbh | Kraftstoffinjektor für eine Brennkraftmaschine sowie Verfahren zur Herstellung eines Kraftstoffinjektors |
DE102005001005B4 (de) | 2005-01-07 | 2008-11-20 | Continental Automotive Gmbh | Stellantrieb zur Betätigung eines Kraftstoffeinspritzventils |
DE102005034689B4 (de) | 2005-07-25 | 2007-07-05 | Siemens Ag | Abdichtungsanordnung eines Piezoaktors in einem Kraftstoffinjektor |
DE102006029966B4 (de) | 2006-06-29 | 2010-04-22 | Continental Automotive Gmbh | Abdichtungsanordnung eines Piezoaktors für ein Kraftstoffeinspritzventil einer Brennkraftmaschine |
DE102007009165A1 (de) * | 2007-02-26 | 2008-08-28 | Robert Bosch Gmbh | Kraftstoffinjektor mit einer zusätzlichen Ablaufdrossel oder mit einer verbesserten Anordnung derselben im Steuerventil |
EP2292918B1 (de) * | 2009-07-23 | 2011-09-07 | C.R.F. Società Consortile per Azioni | Brennstoffeinspritzvorrichtung mit Mess-Servoventil für einen Verbrennungsmotor |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4572433A (en) * | 1984-08-20 | 1986-02-25 | General Motors Corporation | Electromagnetic unit fuel injector |
US4762300A (en) * | 1985-02-19 | 1988-08-09 | Nippondenso Co., Ltd. | Control valve for controlling fluid passage |
ATE67825T1 (de) * | 1985-12-02 | 1991-10-15 | Marco Alfredo Ganser | Kraftstoffeinspritzanlage fuer brennkraftmaschinen. |
DE4340305C2 (de) * | 1993-11-26 | 1998-02-19 | Daimler Benz Ag | Kraftstoffeinspritzdüse für eine Brennkraftmaschine |
FI101739B (fi) * | 1996-08-16 | 1998-08-14 | Waertsilae Nsd Oy Ab | Ruiskutusventtiilijärjestely |
AT2545U1 (de) * | 1998-01-27 | 1998-12-28 | Avl List Gmbh | Kraftstoffeinspritzsystem für eine brennkraftmaschine |
DE19813983A1 (de) * | 1998-03-28 | 1999-09-30 | Bosch Gmbh Robert | Ventil zum Steuern von Flüssigkeiten |
GB2336627A (en) * | 1998-04-24 | 1999-10-27 | Lucas Ind Plc | Fuel injector with biassing spring in blind bore in valve needle |
DE19823937B4 (de) * | 1998-05-28 | 2004-12-23 | Siemens Ag | Servoventil für Kraftstoffeinspritzventil |
DE19859537A1 (de) * | 1998-12-22 | 2000-07-06 | Bosch Gmbh Robert | Kraftstoffeinspritzventil |
-
2000
- 2000-02-17 DE DE10007175A patent/DE10007175B9/de not_active Expired - Lifetime
-
2001
- 2001-02-02 EP EP01102406A patent/EP1126160B1/de not_active Expired - Lifetime
- 2001-02-02 DE DE50105926T patent/DE50105926D1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP1126160A3 (de) | 2003-09-24 |
DE10007175A1 (de) | 2001-08-30 |
EP1126160A2 (de) | 2001-08-22 |
DE10007175B9 (de) | 2004-11-04 |
DE10007175C2 (de) | 2002-05-29 |
DE50105926D1 (de) | 2005-05-25 |
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