EP1632676A1 - Soupape d'injection de carburant avec un injecteur à deux aiguilles controlé par une unité de soupape servo. - Google Patents

Soupape d'injection de carburant avec un injecteur à deux aiguilles controlé par une unité de soupape servo. Download PDF

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Publication number
EP1632676A1
EP1632676A1 EP05103815A EP05103815A EP1632676A1 EP 1632676 A1 EP1632676 A1 EP 1632676A1 EP 05103815 A EP05103815 A EP 05103815A EP 05103815 A EP05103815 A EP 05103815A EP 1632676 A1 EP1632676 A1 EP 1632676A1
Authority
EP
European Patent Office
Prior art keywords
needle
fuel injector
nozzle needle
control chamber
nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05103815A
Other languages
German (de)
English (en)
Inventor
Jürgen Dick
Hellmut Freudenberg
Werner Reim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1632676A1 publication Critical patent/EP1632676A1/fr
Withdrawn legal-status Critical Current

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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

Definitions

  • the invention relates to a fuel injector which is formed with a piezoelectric actuator as a valve drive.
  • the actuator actuates a servo valve unit which controls a register nozzle with two coaxially arranged nozzle needles and thus opens or closes the two rows of spray holes arranged in the lower part of the fuel injector.
  • a fuel injector can be controlled by targeted opening or closing both small and large injection quantities.
  • an injection valve with a register nozzle which has two injection nozzle circuits with associated two nozzle needles.
  • the injection valve has a housing in which a piezoelectric actuator is arranged as a valve drive and a nozzle body. At the lower end of the nozzle body two superimposed rows of spray holes are formed, which are closed by the nozzle needles or can be opened individually.
  • the inner nozzle needle is actuated by a driving mechanism of the outer nozzle needle and thus is not independently controllable.
  • the inner nozzle needle controls in her Closed position or open position the fuel flow through the second row of spray holes.
  • the piezo actuator controls the outer nozzle needle via a servo valve.
  • the servo valve has a correspondingly formed control chamber, which can be opened or closed by a closing member, wherein the closing member is actuated by the actuator.
  • Another common rail injector is known from DE 19936668 A1.
  • the control chamber is arranged in a recess of the injector and is encapsulated by a sleeve of a nozzle spring chamber so that the control chamber and the nozzle spring chamber are hydraulically coupled only via a supply throttle.
  • the sleeve is pressed to seal by means of a spring against a wall of the recess.
  • the invention is based on the object to improve a fuel injector to the effect that its coaxially arranged two nozzle needles are independently controllable and the fuel injector is simpler. This object is achieved with the characterizing features of the main claim.
  • an inner and an outer control chamber are each associated with a nozzle needle and thereby the two nozzle needles independently controllable are. It is considered to be particularly advantageous that the two control chambers are sealed against each other only by a needle guide adapted for the inner nozzle needle. Further components required for sealing, in particular a sealing sleeve between the two nozzle needles, are not required, so that the construction is simplified and the production costs for the fuel injector are reduced.
  • the two nozzle needles can be controlled by two independent control chambers individually and without influencing the respective other nozzle needle. As a result, an optimal metering of the amount of fuel to be injected is possible, which can be optimized for all operating conditions of an internal combustion engine. With this improved injector function, for example, legal requirements for the fulfillment of exhaust emissions can be met more easily.
  • the measures listed in the dependent claims advantageous refinements and improvements of the main claim fuel injector are given. Particularly advantageous appears the solution that the inner nozzle needle is guided in its lower part in the outer nozzle needle and in its upper part by a needle guide plate to the inner control chamber. On the one hand, the inner nozzle needle is guided safely and without play in the axial direction by this double needle guide. On the other hand, at least the upper of the two needle guides is pressure-tight, so that the two control chambers are sealingly separated from each other.
  • This upper needle guide is designed as a disc, which is arranged below the servo valve unit and, for example, can perform other functions such as the intake of high pressure lines, drain lines, etc.
  • the lower needle guide is located within the outer nozzle needle and guides the inner nozzle needle.
  • This needle guide is easily produced, for example, by a corresponding thickening of the inner nozzle needle. Additional components for sealing, such as a sealing sleeve or compression spring are not required and can be saved. This results in cheaper assembly and material costs.
  • a separate inlet throttle is provided for each control room.
  • a separate outlet throttle is provided for each control chamber, so that when the two valve needles open, the outflowing fuel can flow off via the low-pressure region.
  • the two independently controllable valve needles make it possible to control the fuel quantity to be injected individually and optimally in dependence on the operating conditions of the internal combustion engine. For example, smallest injection quantities can be controlled via a row with small spray holes and short opening pulses. In contrast, the largest injection quantity is achieved if both rows of spray holes remain open as long as possible.
  • the inner nozzle needle is pressed by means of a pressure spring designed as an inner nozzle spring against its nozzle seat. This ensures that any dripping of fuel into the combustion chamber of the internal combustion engine is prevented in any case.
  • an outer nozzle spring is provided, which is also designed as a compression spring.
  • the outer nozzle fader is preferably arranged in the outer control chamber and presses the outer nozzle needle against its valve seat. As a result, those associated with the outer nozzle needle The injection holes are securely closed if the outer nozzle needle is not activated.
  • the needle guide plate advantageously has a sleeve-shaped extension. This extension is designed to receive the outer nozzle needle, which is thereby guided safely.
  • an outer inlet throttle is arranged, through which the outer control chamber can be filled with fuel.
  • the outer nozzle needle with a stepped hollow bore, to which the inner nozzle needle is adapted.
  • a stepped bore can be produced more precisely, especially with larger lengths.
  • the formation of a reinforcing ring on the outer circumference of the outer nozzle needle simplifies the formation of a stroke limiter for the outer nozzle needle.
  • the servo valve unit has two separate chambers, which are controllable by two valves.
  • Figure 1 shows a schematic representation of a sectional view of a fuel injector according to the invention
  • FIG. 2 shows a detail of the fuel injector shown in FIG. 1 in the region of the upper needle guide.
  • the fuel injector 10 is composed of several modules.
  • a servo valve unit 2 Below a Injektorgeophuses 1, a servo valve unit 2, a throttle plate 14, a needle guide plate 15 and a nozzle body 23 are arranged.
  • the individual assemblies are assembled pressure-tight by means of a nozzle retaining nut 19, wherein the nozzle retaining nut 19 is pushed from below over the nozzle body 23 and bolted to the injector 1 firmly.
  • the injector housing 1 essentially has a drive unit 6, which is designed as a piezoelectric actuator and is arranged in a central recess of the injector housing 1. This recess simultaneously forms a leakage chamber 8, via which the effluent from the servo valve unit 2 fluid, for example, gasoline or diesel oil can flow into a low pressure region, not shown. Furthermore, a high-pressure bore 7 is provided which communicates with a high fuel pressure injection system, for example a common rail injection system. The high-pressure bore 7 is guided by the individual assemblies 1, 2, 14, 15 and 23, so that the fluid can reach the lower tip of the nozzle body 23.
  • the servo valve unit 2 has essentially a recess 27, in which two coaxially arranged valves 3,4 are arranged and closed in the upper part of the recess 27 of correspondingly shaped sealing seats. In the lower part, the recess 27 is closed by an upper end face of the throttle plate 14. Between the inner valve 3 and the outer valve 4, a separating sleeve 5 is arranged. The separating sleeve 5 is pressed by a compression spring against the upper end face of the throttle plate 14 and thus divides the remaining space of the recess 27 in an inner chamber 25 and an outer chamber 26.
  • the compression spring rests with its upper end against a projecting surface of the inner valve 3, so that both valves 3,4 are pressed against their seat up and close the two chamber 25,26 in the rest position.
  • the two valves are 3,4 in their length so that they can dodge downwards in the axial direction, when the actuator 6 extends downwards.
  • the two upper ends of the two valves 3,4 are formed differently.
  • the inner valve 3 is first actuated, which then moves down. Only after covering a predetermined path and the outer valve 4 is moved downward. Depending on how large the stroke of the actuator 6, thus the inner chamber 25 and also the outer chamber 26 are opened, so that the fuel under high pressure can flow into the leakage chamber 8.
  • the two nozzle needles 20, 22 can be individually controlled without mutual influence, as will be explained in more detail later.
  • the throttle plate (intermediate plate) 14 is arranged below the servo valve unit 2, the throttle plate (intermediate plate) 14 is arranged. It has a recess which is hemispherical or cylindrical at its upper end. This recess forms an inner control chamber (first control chamber) 12, which is bounded by the inner nozzle needle 20. Due to the pressure in the inner control chamber 12, the position of the inner nozzle needle 20 is controlled, which is guided in the axial extension to its valve seat in the lower tip of the nozzle body 23.
  • the first control chamber 12 is connected in the region of the hemispherical space via an inner inlet throttle 11 with the high pressure line 7, wherein the connecting line for manufacturing reasons, preferably at least partially formed in the sealing surface between the servo valve unit 2 and the throttle plate 14. Furthermore, the hemispherical space is connected to a drain line 9, which may also be designed as a drain throttle and is guided to the inner chamber 25.
  • an inner nozzle spring 21 is arranged, which is supported against an upper ceiling surface of the first control chamber 12 and with its lower end presses against a shoulder of the inner nozzle needle 20, so that the inner nozzle needle 20 is pressed against its lower valve seat in the nozzle body 23 and thereby the inner injection holes 28 closes.
  • the needle guide plate 15 is disc-shaped and has downwardly an inner extension which is formed substantially as an outer needle guide 32 for the outer nozzle needle 22.
  • the upper and the lower control chamber 12,13 is arranged so that the two control chambers 12,13 are permanently separated by the needle guide plate 15.
  • the needle guide plate 15 forms with its central bore a fixed upper needle guide 16, through which the inner nozzle needle 20 is guided in its upper area without play.
  • the upper needle guide 16 is formed in its configuration and its dimensions such that the upper needle guide 16 together with the inner nozzle needle 20, the two control chambers 12,13 high pressure resistant separates and seals.
  • the inner nozzle needle 20 is formed in the region of the needle guide 16 with a reinforced ring that fits snugly and sealingly into a correspondingly shaped guide bore of the upper needle guide 16. A separating sleeve is not required. The fuel in the first control chamber 12 under high pressure can thus not get into the outer control chamber 13 via the inner nozzle needle 20 and vice versa.
  • the outer control chamber (second control chamber) 13 is arranged below the upper needle guide 16, below the outer control chamber (second control chamber) 13 is arranged. It is bounded at the top by the needle guide plate 15 with the inner nozzle needle 20 and laterally by the inner extension 32. Downwardly, the outer control chamber 13 is bounded by an end face of the outer nozzle needle 22. Through the interior the outer control chamber 13, the inner nozzle needle 20 runs. Furthermore, an outer nozzle spring is arranged. The outer nozzle spring presses on the end face of the outer nozzle needle 22 and presses the outer nozzle needle 22 against its valve seat so that the outer injection holes 30 located in the nozzle tip of the nozzle body 23 are closed.
  • the outer control chamber 13 is connected via an outer inlet throttle 31 to the high-pressure line 7, so that the fuel can flow into the outer control chamber 13 and here builds about the same high pressure as in the high pressure line 7.
  • the outer inlet throttle 31 is preferably via a sleeve-shaped extension in the needle guide plate 15 introduced. Furthermore, the outer control chamber 13 is connected via a drain hole 17 through the needle guide plate 15 and the throttle plate 14 through to the outer chamber 26.
  • the needle guide plate 15 is elongated sleeve-shaped downwards, so that its central bore for receiving the outer nozzle needle 22 is suitable.
  • This sleeve-shaped extension is designed as an outer needle guide 32 for the outer nozzle needle 22.
  • a stop plate 18 is provided against which the outer nozzle needle 22 abuts when it lifts from its valve seat and the outer injection holes 30 releases.
  • the outer nozzle needle 22 has at its outer periphery below the sleeve-shaped extension 32 on a reinforcing ring with an upper bearing surface. With this bearing surface, the outer nozzle needle 22 abuts against the stop ring 18 when it moves from its lower valve seat upwards.
  • the outer nozzle needle 22 may be extended into the outer control chamber 13 and formed to guide the outer nozzle spring.
  • the outer nozzle needle 22 In the lower region, the outer nozzle needle 22 with its tip is seated on a cone-shaped valve seat within the nozzle body 23 in order to close the associated injection holes 30. A further guide is not required, but it can be provided if necessary.
  • the outer nozzle needle 22 is formed as a hollow needle and receives the inner nozzle needle 20. To guide the inner nozzle needle 20, the outer nozzle needle 22 on the inside a second, lower needle guide 24, which is arranged in a longitudinal bore in the lower part of the outer nozzle needle 22. The inner nozzle needle 20 is thus guided by the fixed upper needle guide 16 and the movably arranged lower needle guide 24 within the outer nozzle needle 22.
  • the lower needle guide 24 is likewise to be arranged as pressure-tight as possible and higher in the direction of the upper needle guide 16.
  • the control volume in the outer control chamber 13 is reduced so that a faster response of the outer nozzle needle 22 results.
  • it is provided to narrow the bore in the outer nozzle needle 22 via a shoulder, which is arranged approximately in the half length of the outer nozzle needle 22, downwards.
  • This has particular manufacturing advantages and facilitates the production of the fit for the correspondingly adapted inner nozzle needle 20.
  • the upper stop for the inner nozzle needle 20 is provided to form the bore in the throttle plate 14 is slightly narrower than in the needle guide plate 15. This arises at the transition to Throttle plate 14 a paragraph against which the inner nozzle needle 20 can strike when it lifts from its valve seat.
  • FIG. 2 shows an enlarged section of the region of the fuel injector 10 according to the invention, marked with a circle x.
  • Figure 2 shows the outer control chamber 13 which is bounded laterally by the extended part of the needle guide plate 15 substantially. Towards the top, the outer control chamber 13 is delimited by the continuous inner nozzle needle 20 and the upper needle guide 16. The outer control chamber 13 is connected via the outer inlet throttle 31 to the high-pressure bore 7. In the left part of the outer control chamber 13, the drain hole 17 can be seen, which is in communication with the outer chamber 26 of the servo valve unit 2.
  • the outer nozzle spring 21 is arranged, which is designed as a compression spring. It rests against the needle guide plate 15 and presses the outer nozzle needle 22 against its valve seat to close their series with spray holes 30 in the non-driven state.
  • the needle stop disc 18 is arranged, to which the outer nozzle needle 22 abuts with a correspondingly shaped shoulder, when the outer nozzle needle 22 is driven and thereby stands out from its valve seat.
  • the nozzle body 23 is pressed by the nozzle lock nut 19 against the needle guide plate 15.
  • the piezoelectric actuator 6 If the piezoelectric actuator 6 is driven with a DC voltage signal, then it extends downwards and touches with its bottom plate after overcoming a given very small idle stroke first, the inner valve 3.
  • the actuator 6 against a in the actuator. 6 acting built-in restoring force the opening pressure in the inner chamber 25 and the spring pressure against the separating sleeve work.
  • the fuel under high pressure flows from the inner control chamber 12 into the leakage chamber 8 and thus reaches the low-pressure region of the fuel system.
  • the pressure in the inner control chamber 12 is rapidly reduced. Outside the inner control chamber 12, however, the very high pressure still prevails, so that the inner nozzle needle 20 is pushed upwards by correspondingly shaped pressure surfaces.
  • the inner nozzle needle 20 lifts from its valve seat and releases the first row of spray holes 28.
  • the cross section of the injection holes 28,30 depends on the application and can be dimensioned accordingly, for example for a minimum injection.
  • the inner nozzle needle 20 again closes its injection holes 28, since the pressure in the inner chamber 25 and in inner control chamber 3 rises again because of the connection to the high pressure bore 7.
  • the inner nozzle needle 20 can thus be controlled independently of the outer nozzle needle 22.
  • the outer valve 4 also opens its outer chamber 26 because of the further extension of the actuator 6
  • the fuel from the outer control chamber 13 via the drain hole 17 and the outer chamber 26 flows into the leakage chamber 8. This causes the pressure in the outer control chamber 13, so that now the outer nozzle needle 22 releases its second row of spray holes 30 and the Fuel can be injected into the combustion chamber of the internal combustion engine.
  • the outer nozzle needle 22 again closes its injection holes 30. In this way, for example, to control a maximum injection quantity and the outer nozzle needle 22 can be controlled individually and without affecting the inner nozzle needle 20.

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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)
EP05103815A 2004-09-02 2005-05-09 Soupape d'injection de carburant avec un injecteur à deux aiguilles controlé par une unité de soupape servo. Withdrawn EP1632676A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200410042558 DE102004042558B4 (de) 2004-09-02 2004-09-02 Kraftstoffinjektor mit einer von einer Servoventileinheit gesteuerten Registerdüse

Publications (1)

Publication Number Publication Date
EP1632676A1 true EP1632676A1 (fr) 2006-03-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP05103815A Withdrawn EP1632676A1 (fr) 2004-09-02 2005-05-09 Soupape d'injection de carburant avec un injecteur à deux aiguilles controlé par une unité de soupape servo.

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EP (1) EP1632676A1 (fr)
DE (1) DE102004042558B4 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4535037B2 (ja) * 2006-02-08 2010-09-01 株式会社デンソー インジェクタおよび燃料噴射装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10305508A1 (de) * 2003-02-11 2004-08-19 Robert Bosch Gmbh Kraftstoffeinspritzventil für eine Brennkraftmaschine sowie Verfahren zum Betreiben einer Brennkraftmaschine
WO2004083621A1 (fr) * 2003-03-21 2004-09-30 Siemens Aktiengesellschaft Soupape d'injection pourvue d'une aiguille et d'une aiguille creuse a actionnement hydraulique et procede de commande de l'injection
WO2005040594A1 (fr) * 2003-10-24 2005-05-06 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion interne
WO2005057003A1 (fr) * 2003-12-10 2005-06-23 Siemens Aktiengesellschaft Soupape d'injection de carburant

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3214040A1 (de) * 1982-04-16 1983-10-20 Volkswagenwerk Ag, 3180 Wolfsburg Kraftstoffeinspritzduese, insbesondere fuer einen schnellaufenden fahrzeug-dieselmotor
EP0978649B1 (fr) * 1998-08-06 2004-05-12 Siemens Aktiengesellschaft Buse d'injection de combustible
US6471142B1 (en) * 1999-04-01 2002-10-29 Delphi Technologies, Inc. Fuel injector
JP4221913B2 (ja) * 2001-04-26 2009-02-12 トヨタ自動車株式会社 燃料噴射装置
DE10131953A1 (de) * 2001-07-02 2003-01-23 Siemens Ag Steuermodul für einen Injektor eines Speichereinspritzsystems
JP3865222B2 (ja) * 2002-03-05 2007-01-10 株式会社デンソー 燃料噴射装置
DE102004042190B4 (de) * 2004-08-31 2009-04-16 Continental Automotive Gmbh Kraftstoffinjektor mit zwei von einer Servoventileinheit getrennt steuerbaren Steuerräumen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10305508A1 (de) * 2003-02-11 2004-08-19 Robert Bosch Gmbh Kraftstoffeinspritzventil für eine Brennkraftmaschine sowie Verfahren zum Betreiben einer Brennkraftmaschine
WO2004083621A1 (fr) * 2003-03-21 2004-09-30 Siemens Aktiengesellschaft Soupape d'injection pourvue d'une aiguille et d'une aiguille creuse a actionnement hydraulique et procede de commande de l'injection
WO2005040594A1 (fr) * 2003-10-24 2005-05-06 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion interne
WO2005057003A1 (fr) * 2003-12-10 2005-06-23 Siemens Aktiengesellschaft Soupape d'injection de carburant

Also Published As

Publication number Publication date
DE102004042558A1 (de) 2006-03-23
DE102004042558B4 (de) 2007-12-13

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