EP1143137B1 - Steuereinheit für einen Injektor einer Einspritzanlage - Google Patents
Steuereinheit für einen Injektor einer Einspritzanlage Download PDFInfo
- Publication number
- EP1143137B1 EP1143137B1 EP01108767A EP01108767A EP1143137B1 EP 1143137 B1 EP1143137 B1 EP 1143137B1 EP 01108767 A EP01108767 A EP 01108767A EP 01108767 A EP01108767 A EP 01108767A EP 1143137 B1 EP1143137 B1 EP 1143137B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- throttle
- inlet
- control valve
- flow resistance
- outlet
- 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
- 238000002347 injection Methods 0.000 title claims description 33
- 239000007924 injection Substances 0.000 title claims description 33
- 238000009434 installation Methods 0.000 title claims 2
- 239000000446 fuel Substances 0.000 claims description 23
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000003756 stirring Methods 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
- 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
- F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
- F02M2547/008—Means for influencing the flow rate out of or into a control chamber, e.g. depending on the position of the needle
Definitions
- the invention relates to a control unit according to the preamble of claim 1 for controlling the nozzle needle movement in an injector for an injection system of an internal combustion engine.
- the injection nozzle of the injector is displaced by a mounted nozzle needle released or closed, the Nozzle needle movement through an integrated into the injector Control unit is specified to the desired injection times to reach.
- the control unit on the top of the nozzle needle arranged fuel-filled Control room with an inlet and a drain on, wherein the in the control room prevailing fuel pressure on the upper Front side of the nozzle needle acts, so that the nozzle needle movement by controlling the fuel pressure in the control room leaves.
- a disadvantage of these known injectors is a constructive Target conflict in the dimensioning of the inlet to the Control space.
- it is as fast as possible Closing the nozzle needle from a combustion point of view required to those specified by the engine control To be able to comply with tax times, especially for the Minimizing particulate emissions is important.
- must arranged in the inlet to the control room inlet throttle have the lowest possible flow resistance, so in the control room as soon as possible to close the Injector necessary fuel pressure to be built up can.
- a low flow resistance of the Inlet throttle during the injection phase with open control valve in the course of the control room to an undesirable leakage, because the fuel supplied via the inlet throttle the control room via the outlet throttle and the control valve leaves immediately.
- a reduction of the flow resistance thus leads advantageously to a Shortening the response time of the injector when closing the injection nozzle, however, are by such a measure simultaneously increases the leakage losses.
- US-A-5438968 is an injector for an injection system an internal combustion engine known with a control unit for controlling the nozzle needle movement and with a fuel filled and hydraulically acting on the nozzle needle control chamber with an inlet and a drain, wherein in the process a control valve and arranged in the inlet an inlet throttle is.
- the injector is characterized in that the Inlet restrictor has a variable flow resistance.
- the invention is therefore based on the object, an injector to create the type described above, the possible low leakage losses during the injection phase one possible fast closing of the injector allows without to increase the minimum opening pressure of the injector.
- the object is, starting from the above known control unit for controlling the nozzle needle movement according to the preamble of claim 1, by the characterizing Characteristics of claim 1 solved.
- the invention comprises the general technical teaching in which Inlet and / or in the expiration of the control room of the control unit To use chokes with variable flow resistances to reduce the leakage when the control valve is open and still allow a quick closing of the injector.
- the flow resistance of the inlet throttle is during the Injection phase with open control valve preferably larger as during the closing phase with the control valve closed, so that as little fuel as possible during the injection phase enters the control room, resulting in a reduction the leakage losses during the injection phase leads.
- the inlet throttle changes its flow resistance independently depending on the position of the control valve.
- an outlet throttle with a variable flow resistance arranged, on the one hand, the leakage losses in the injection phase reduce with open control valve and on the other hand a rapid pressure build-up in the control room at Close the injector to allow.
- the flow resistance the outlet throttle is therefore with the control valve open preferably lower than when the control valve is closed.
- the outlet throttle changes its flow resistance independently depending on the position of the Control valve, but is also an external control, for example possible through the engine control.
- the outlet throttle can also be integrated in the control valve be by the control valve, for example, as a continuous Throttle valve is formed.
- the outlet throttle but together with the inlet throttle in one Throttle valve integrated, which is used to control the respective Flow resistance has a rotary piston, the flow or the inlet of the control room in dependence on his Turn position releases or closes to varying degrees.
- FIG. 1 shows an inventive Control unit of an injector for an injection system Internal combustion engine, the injector and the injection system otherwise constructed in a conventional manner, so that to a representation of the details of the injector and the Injection system is omitted.
- the injector has a nozzle needle 1, which is axially displaceable in a nozzle needle guide 2 is stored, so that the nozzle needle 1 in the nozzle needle guide 2 forms a piston in the upper part of the Düsennadel exchange 2 a designated as control chamber 3 Kraftstoff Jackes Includes volume so that the fuel pressure in the control chamber 3 on the upper end face of the nozzle needle 1 works.
- a Inlet restrictor ZD is arranged for controlling the fuel pressure in the Control room 3 is this via an inlet 4 with the actual Injection connected, wherein in the inlet 4 a Inlet restrictor ZD is arranged.
- control room 3 via an outlet throttle AD and a control valve SV connected to a return line 5, wherein the control valve SV is actuated by a piezoelectric actuator 6, which in turn via a control line 7 is connected to the engine control.
- the control valve SV opened by the piezoelectric actuator 6, so that the fuel in the Control chamber 6 can flow through the return line 5, which even with another supply of fuel via the inlet 4 to a drop in fuel pressure in the control room 3 leads, causing the on the upper face of the nozzle needle 1 acting back pressure reduced, so that the Nozzle needle 1 moves upwards and thus the injection nozzle opens.
- control valve SV then closed by the piezoelectric actuator 6, so that no fuel more from the control room 3 via the return line. 5 can flow, so that in the control room 3 again the Set rail pressure, whereupon the nozzle needle 1 due the higher pressure on its top and the spring force behind moved down to the closed position.
- the inlet throttle ZD here has a variable flow resistance on, at the lowest possible leakage losses during the injection phase as fast as possible closing allow the injector. Such is the flow resistance the inlet throttle ZD with open control valve SV relative great to minimize leakage losses. If that Control valve SV, on the other hand, closes to the injection phase stop, takes the flow resistance of the inlet throttle ZD from, so that in the control room 3 as fast as possible to Close the injector required fuel pressure can build up.
- the outlet throttle AD has a variable Flow resistance in order to minimize leakage losses the fastest possible closing of the injection nozzle to enable.
- the flow resistance of the outlet throttle AD relatively low with the control valve open, so that the fuel at the beginning of the injection phase as possible can drain quickly from the control room 3. While closing the control valve SV towards the end of the injection phase takes against it also the flow resistance of the outlet throttle AD to, to a possible rapid construction of the closing of the nozzle needle 1 required fuel pressure in the control room 3 to allow.
- the inlet throttle ZD is here in the lower part of the rotary throttle arranged and has an annular channel 10, which the Sleeve 8 surrounds and into which the inlet 4 opens.
- Ring channels 10 are diametrically radially continuous in the sleeve 8 Holes 11 attached.
- radially extending tap holes 12 arranged in the Inside the rotary piston 9 in axially extending inlet throttle holes 13 open at the lower end of the rotary piston 9 ends, so that the fuel in the in Fig. 2a to 2c illustrated injection position via the inlet 4, the Ring channel 10, the holes 11 in the sleeve 8, the holes 12 in the rotary piston 9 and finally the inlet throttle holes 13 may enter the control room 3.
- the in the Fig. 2a to 2c illustrated injection position via the inlet 4 the Ring channel 10
- the holes 11 in the sleeve 8 the holes 12 in the rotary piston 9 and finally the inlet throttle holes 13 may enter the control room 3.
- the illustrated rotary throttle includes Also has axial bores 14, wherein the axial bores 14th open in the lower end face of the rotary piston 9, so that Fuel from the control chamber 3 unhindered in the axial bores 14 can occur.
- the axial bores 14, however, go not over the entire length of the rotary piston 9 through, but open in the upper region of the rotary piston 9 in two horizontally running tap holes 15.1, 15.2, the side in the Jacket surface of the rotary piston 9 ends, wherein the inner wall the sleeve 8 in this area as a planing surface 16.1 or 16.2 is formed so that the tap holes 15.1, 15.2 in the closed position shown in Figs. 2a to 2c of the planing surfaces 16.1 and 16.2 are closed.
- the Rotary throttle thus closes completely or in this state has at least one very large flow resistance.
- an opening of the control valve SV takes the Fuel pressure arranged in a above the rotary piston Drain hole 17, located in the above the rotary piston Room 18 and in the spaces 19 between the Rotary piston 8 and the planing surfaces 16.1 and 16.2 respectively on the tap holes 15.1, 15.2 opposite sides resulting in a torque on the rotary piston 9 in FIG. 2b in the counterclockwise direction.
- This torque is stirring therefore, that the two tap holes 15.1 and 15.2 in the Rotary piston arranged decentrally and with respect to the axis of rotation of the rotary piston 9 are aligned differently.
- a Opening of the control valve SV rotates the rotary piston therefore counterclockwise until the rotary piston 9 again abuts the plane sealing surfaces 16.1, 16.2.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
- Fig. 1
- eine Steuereinheit eines Injektors für eine Einspritzanlage einer Brennkraftmaschine in schematischer Darstellung,
- Fig. 2a
- eine Querschnittsdarstellung der erfindungsgemäßen Steuereinheit in der Schließphase,
- Fig. 2b
- eine Querschnittsdarstellung der erfindungsgemäßen Steuereinheit entlang der Linie B-B in Fig. 2a,
- Fig. 2c
- eine Querschnittsdarstellung der erfindungsgemäßen Steuereinheit entlang der Linie A-A in Fig. 2a,
- Fig. 3a-3c
- die Darstellungen gemäß Fig. 2a bis 2c während der Einspritzphase, sowie
- Fig. 4
- den Verlauf des Öffnungsradius der Drosseln in Abhängigkeit von dem Drehwinkel des Drehkolbens.
Claims (15)
- Injektor für eine Einspritzanlage einer Brennkraftmaschine mit einer Steuereinheit zur Steuerung der Düsennadelbewegung und
einem kraftstoffgefüllten und hydraulisch auf die Düsennadel (1) wirkenden Steuerraum (3) mit einem Zulauf (4) und einem Ablauf (5),
wobei in dem Ablauf (5) ein Steuerventil (SV) und in dem Zulauf (4) eine Zulaufdrossel (ZD) angeordnet ist, wobei
die Zulaufdrossel (ZD) einen variablen Strömungswiderstand aufweist.
dadurch gekennzeichnet, daß der Strömungswiderstand der Zulaufdrossel (ZD) bei geöffnetem Steuerventil (SV) größer ist als bei geschlossenem Steuerventil (SV). - Injektor nach Anspruch 1,
dadurch gekennzeichnet, daß die Zulaufdrossel (ZD) ihren Strömungswiderstand bei einer Öffnung des Steuerventils (SV) durch einen daraus resultierenden hydraulischen Vorgang vergrößert und/oder ihren Strömungswiderstand bei einem Schließen des Steuerventils (SV) durch einen daraus resultierenden hydraulischen Vorgang verringert. - Injektor nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß die Zulaufdrossel (ZD) als Drosselventil ausgebildet ist und einen verstellbaren Ventilkörper (9) zur Steuerung des Strömungswiderstands aufweist. - Injektor nach Anspruch 3,
dadurch gekennzeichnet, daß der Ventilkörper der Zulaufdrossel (ZD) ein Drehkolben (9) ist, der den Zulauf (4) in Abhängigkeit von seiner Drehstellung in unterschiedlichem Maß freigibt oder verschließt. - Injektor nach einem der Ansprüche 3 bis 4,
dadurch gekennzeichnet, daß der Ventilkörper (9) der Zulaufdrossel (ZD) mit einer Feder belastet ist, die den Zulauf (4) bei einem Schließen des Steuerventils (SV) öffnet. - Injektor nach einem der Ansprüche 3 bis 5,
dadurch gekennzeichnet, daß der Zulauf (4, 11, 12) strömungstechnisch so gestaltet ist, daß der Ventilkörper (9) beim Schließen des Steuerventils (SV) von einer hydraulischen Kraft belastet ist, die die Zulaufdrossel (ZD) bei einem Schließen des Steuerventils (SV) öffnet. - Injektor nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß in dem Ablauf (5) des Steuerraums (3) eine Ablaufdrossel (AD) mit einem variablen Strömungswiderstand angeordnet ist. - Injektor nach Anspruch 7,
dadurch gekennzeichnet, daß der Strömungswiderstand der Ablaufdrossel (AD) bei geöffnetem Steuerventil (SV) kleiner ist als bei geschlossenem Steuerventil (SV). - Injektor nach Anspruch 8,
dadurch gekennzeichnet, daß die Ablaufdrossel (AD) ihren Strömungswiderstand bei einer Öffnung des Steuerventils (SV) durch einen daraus resultierenden hydraulischen Vorgang verringert und/oder ihren Strömungswiderstand bei einem Schließen des Steuerventils (SV) durch einen daraus resultierenden hydraulischen Vorgang vergrößert. - Injektor nach einem der Ansprüche 7 bis 9,
dadurch gekennzeichnet, daß die Ablaufdrossel (AD) als Drosselventil ausgebildet ist und einen verstellbaren Ventilkörper (9) zur Steuerung des Strömungswiderstands aufweist. - Injektor nach Anspruch 10,
dadurch gekennzeichnet, daß der Ventilkörper der Ablaufdrossel (AD) ein Drehkolben (9) ist, der den Ablauf (5) in Abhängigkeit von seiner Drehstellung in unterschiedlichem Maß freigibt oder verschließt. - Injektor nach einem der Ansprüche 10 bis 11,
dadurch gekennzeichnet, daß der Ventilkörper (9) der Ablaufdrossel (AD) mit einer Feder belastet ist, die die Ablaufdrossel (AD) bei einem Schließen des Steuerventils (SV) öffnet. - Injektor nach einem der Ansprüche 10 bis 12,
dadurch gekennzeichnet, daß der Zulauf (4, 11, 12) strömungstechnisch so gestaltet ist, daß der Ventilkörper (9) der Ablaufdrossel (AD) beim Schließen des Steuerventils (SV) von einer hydraulischen Kraft belastet ist, die die Ablaufdrossel (AD) bei einem Öffnen des Steuerventils (SV) öffnet. - Injektor nach einem der Ansprüche 11 bis 13,
dadurch gekennzeichnet, daß in dem Drehkolben (9) ein Strömungskanal (14) angeordnet ist, der auf der dem Steuerraum (3) zugewandten Seite in der Stirnfläche des Drehkolbens (9) und auf der dem Steuerraum (3) abgewandten Seite in der abgeflachten Mantelfläche des Drehkolbens (9) endet, wobei die Austrittsöffnung in der Mantelfläche des Drehkolbens (9) dezentral ausgerichtet ist, um ein Stellmoment auf den Drehkolben (9) auszuüben. - Injektor nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß die Zulaufdrossel (ZD) und die Ablaufdrossel (AD) einen gemeinsamen Ventilkörper (9) zur Steuerung des jeweiligen Strömungswiderstands aufweisen.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10017366A DE10017366C2 (de) | 2000-04-07 | 2000-04-07 | Steuereinheit für einen Injektor einer Einspritzanlage |
DE10017366 | 2000-04-07 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1143137A2 EP1143137A2 (de) | 2001-10-10 |
EP1143137A3 EP1143137A3 (de) | 2003-10-01 |
EP1143137B1 true EP1143137B1 (de) | 2005-06-22 |
Family
ID=7637950
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01108767A Expired - Lifetime EP1143137B1 (de) | 2000-04-07 | 2001-04-06 | Steuereinheit für einen Injektor einer Einspritzanlage |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1143137B1 (de) |
DE (2) | DE10017366C2 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
DE102019208333A1 (de) * | 2019-06-07 | 2020-12-10 | Robert Bosch Gmbh | Kraftstoffinjektor, Verfahren zum Betreiben eines Kraftstoffinjektors |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5230613A (en) * | 1990-07-16 | 1993-07-27 | Diesel Technology Company | Common rail fuel injection system |
US5438968A (en) * | 1993-10-06 | 1995-08-08 | Bkm, Inc. | Two-cycle utility internal combustion engine |
DE19516245C2 (de) * | 1995-05-03 | 2002-12-05 | Daimler Chrysler Ag | Verfahren zum Steuern einer mehrphasigen Einspritzung eines direkt einspritzenden Dieselmotors |
JP3555264B2 (ja) * | 1995-07-14 | 2004-08-18 | いすゞ自動車株式会社 | 内燃機関の燃料噴射装置 |
DE69619949T2 (de) * | 1995-12-19 | 2002-11-14 | Nippon Soken | Speicherkraftstoffeinspritzvorrichtung |
JP2828033B2 (ja) * | 1996-05-28 | 1998-11-25 | 三菱自動車工業株式会社 | 燃料噴射装置 |
JP2000054930A (ja) * | 1998-08-06 | 2000-02-22 | Nissan Motor Co Ltd | ディーゼルエンジンの燃料噴射装置 |
US6024296A (en) * | 1998-08-10 | 2000-02-15 | Caterpillar, Inc. | Direct control fuel injector with dual flow rate orifice |
DE19940290A1 (de) * | 1999-08-25 | 2001-03-01 | Bosch Gmbh Robert | Steuerventil für ein Kraftstoffeinspritzventil |
-
2000
- 2000-04-07 DE DE10017366A patent/DE10017366C2/de not_active Expired - Fee Related
-
2001
- 2001-04-06 DE DE50106567T patent/DE50106567D1/de not_active Expired - Fee Related
- 2001-04-06 EP EP01108767A patent/EP1143137B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE50106567D1 (de) | 2005-07-28 |
EP1143137A3 (de) | 2003-10-01 |
EP1143137A2 (de) | 2001-10-10 |
DE10017366C2 (de) | 2002-10-31 |
DE10017366A1 (de) | 2001-10-18 |
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