WO2007110256A1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

Info

Publication number
WO2007110256A1
WO2007110256A1 PCT/EP2007/050777 EP2007050777W WO2007110256A1 WO 2007110256 A1 WO2007110256 A1 WO 2007110256A1 EP 2007050777 W EP2007050777 W EP 2007050777W WO 2007110256 A1 WO2007110256 A1 WO 2007110256A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
fuel injector
chamber
control
steuerventilkorper
Prior art date
Application number
PCT/EP2007/050777
Other languages
German (de)
English (en)
Inventor
Friedrich Boecking
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2007110256A1 publication Critical patent/WO2007110256A1/fr

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
    • 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
    • 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
    • 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
    • F02M2547/001—Control chambers formed by movable sleeves

Definitions

  • the invention relates to a fuel injector according to the preamble of claim 1.
  • the object of the invention is to provide a fuel injector according to the preamble of claim 1, which is simple and inexpensive to produce.
  • the object is in a fuel injector with an injector, which has a pressure chamber from which, depending on the pressure in a control chamber, acted upon by high pressure Fuel is injected into a combustion chamber of an internal combustion engine, when a nozzle needle lifts from its seat, wherein the pressure in the control chamber is controlled by an actuator via a control valve body, which is movable from a closed position to an open position to a flow connection between the control chamber and release a pressure relief space, thereby solved that the Steuerventilkorper is directly, that is acted upon without the interposition of a throttle device, with the control chamber pressure.
  • an outlet throttle is connected between the control chamber and the Steuerventilkorper to ensure a defined opening movement of the nozzle needle.
  • the disadvantages associated with omitting the drain throttle are deliberately accepted. This provides the advantage that the actuator can be used very efficiently as a sensor.
  • the force acting on the Steuerventilkorper corresponds to the control chamber pressure.
  • a preferred exemplary embodiment of the fuel injector is characterized in that the control valve body is mechanically coupled to the actuator.
  • the pressure in the control room can be detected via the control valve body with the actuator.
  • Another preferred exemplary embodiment of the fuel injector is characterized in that between the actuator and the control valve body in the non-activated state of the actuator, a preliminary stroke is provided, which serves a residual error to overcome a temperature compensation. After overcoming the forward stroke, the actuator can be used as a sensor to detect the entire pressure curve in the control chamber, up to the time in which the actuator is controlled.
  • a further preferred exemplary embodiment of the fuel injector is characterized in that the control valve body is arranged in the control chamber. This has the advantage that the Steuerventilkorper is acted upon directly with the control chamber pressure.
  • the control valve body can be arranged completely or only partially in the control room.
  • control valve body is pretensioned by a spring device into its closed position.
  • the spring device is, for example, a helical compression spring.
  • a further preferred exemplary embodiment of the fuel injector is characterized in that the spring device is clamped between the control valve body and a Abstutzring. This ensures a simple way a safe Abstutzung the Steuerventilkorpers.
  • the Steuerraumbegrenzungshulse is preferably equipped with a biting edge, which abuts the Abstutzring or digs into it.
  • Another preferred exemplary embodiment of the fuel injector is characterized in that the control valve body is arranged in the pressure relief space such that the control valve body releases an unthrottled flow connection between the control chamber and the pressure relief space in its open position.
  • FIG. 1 shows a fuel injector according to a first exemplary embodiment in longitudinal section
  • the fuel injector 1 shows a fuel injector 1 is shown in longitudinal section.
  • the fuel injector 1 comprises an injector housing 2 with an injector body 3, which is also referred to as a holding body.
  • an injector body 3 Through the injector body 3 extends a high-pressure fuel passage 4, which is also referred to as an intake passage and is in communication with a central high-pressure fuel source.
  • the high-pressure fuel channel 4 extends through a valve plate 6 into a nozzle body 7.
  • the nozzle body 7 and the valve plate 6 are clamped by means of a clamping nut 8 against the injector body 3.
  • a nozzle needle 10 is guided with a tip 11 in the axial direction movable back and forth.
  • the nozzle needle 10 has a pressure shoulder 13 in the region of a pressure chamber 12.
  • the pressure chamber 12 is in communication with the high-pressure fuel passage 4.
  • the nozzle body 7 protrudes with its free end into a combustion chamber of an internal combustion engine to be supplied with fuel.
  • high-pressure fuel is injected through at least one unnamed injection hole in the combustion chamber of the internal combustion engine.
  • the tip 11 of the nozzle needle 10 is also referred to as the combustion chamber near the end of the nozzle needle 10.
  • the combustion chamber remote end of the nozzle needle 10 defines a control chamber 14 in the axial direction. In radia- In the direction of the control chamber 14 is bounded by a Steuraumbegrenzungshulse 15, which is guided at the combustion chamber remote end of the nozzle needle 10 under sealing effect.
  • the Steuerraumbegrenzungshulse 15 is equipped with an inlet throttle 17, passes through the high-pressure fuel from the high-pressure fuel passage 4 into the control chamber 14.
  • a nozzle spring 18 is clamped between the control chamber limiting sleeve 15 and a collar 19 formed on the nozzle needle 10. By the biasing force of the nozzle spring 18, the tip 11 of the nozzle needle 10 is held in contact with the associated sealing seat.
  • the control chamber 14 is connected via a pressure relief hole 20 with a pressure relief chamber 22 in the interior of the Inj ektorkorpers 3 in connection.
  • the pressure relief space 22 communicates with a fuel tank via a leakage oil discharge line 23, for example.
  • the pressure relief bore 20 can be closed by a Steuerventilkorper 25.
  • the Steuerventilkorper 25 is part of a so-called A-valve.
  • A-valves are valves which open to the outside. The opening movement of the control valve body 25 takes place against the control chamber pressure.
  • the control valve body 25 is biased into its closed position, in which it closes the pressure relief bore 20, which is recessed in the valve plate 6.
  • the valve spring 28 is clamped between the Steuerventilkorper 25 and a Abstutzring 30, which in turn is clamped between the Steuerraumbegrenzungshulse 15 and the valve plate 6.
  • the combustion chamber near the end of Steuerventilkorpers 25 limits the control chamber 14 in the axial direction.
  • the combustion chamber remote end of the Steuerventilkorpers 25 is arranged at a distance 32, which is also referred to as a preliminary stroke, to an actuator projection 34 of a piezoelectric actuator 35.
  • the combustion chamber remote end of the piezoelectric actuator 35 is supported on a compensation element 37.
  • the piezoelectric actuator 35 is equipped in a known manner with a Federhulse 38.
  • the piezoelectric actuator 35 If the piezoelectric actuator 35 is activated, then it expands, and comes after overcoming the Vorhubs 32 at the combustion chamber remote end of the Steuerventilkorpers 25 to the plant. A further expansion of the piezoelectric actuator 35 causes the Steuerven- tilkorper 25 moves from its closed position to its open position in which the control chamber 14 communicates via the pressure relief bore 20 with the pressure relief chamber 22. By thus causing pressure relief in the control chamber 14, the nozzle needle 10 lifts with its tip 11 from the associated valve seat, so that high-pressure fuel is injected into the combustion chamber.
  • the piezoelectric actuator 35 When the piezo actuator 35 is deactivated, it contracts again. Due to the biasing force of the valve spring 28 of the Steuerventilkorper 25 is returned to its closed position. According to an essential aspect of the present invention, the piezoelectric actuator 35 can be used as a sensor after overcoming the preliminary stroke 32. The entire pressure curve in the control chamber 14 can, except for the time in which the piezoelectric actuator 35 is driven, be measured with the piezoelectric actuator 35. In this case, the start of injection of the opening of the nozzle needle 10 and the injection end corresponds to the closing point of the nozzle needle 10th
  • FIG. 2 shows a longitudinal section of a fuel injector 41, which is similar to the fuel injector 1 shown in FIG. To denote the same or similar parts, the same reference numerals are used. To avoid repetition, reference is made to the preceding description of FIG. The main focus will be on the differences between the two exemplary embodiments.
  • the clamping nut (8 in Figure 1) is not shown.
  • the control valve in the exemplary embodiment shown in Figure 2 as so-called I-valve, that is, inwardly opening valve is executed.
  • This type of valve has the advantage that the opening movement is supported by the pressure difference between a control chamber 54 and the pressure relief chamber 22.
  • the control chamber 54 is recessed to a part in the combustion chamber distal end of the nozzle needle 10 and to another part in the valve plate 6. This has the advantage that the Steuerraumbegrenzungshulse (15 in Figure 1) can be omitted.
  • the control chamber 54 is connected via an inlet throttle 57, which is provided in the valve plate 6, with Fuel filled. Between the combustion chamber remote end of the nozzle needle 10 and the valve plate 6, a nozzle spring 58 is clamped, which is partially accommodated in the combustion chamber remote end of the nozzle needle 10, which forms part of the control chamber 54.
  • the control chamber 54 communicates via a pressure relief bore 60 with the pressure relief chamber 22 in connection.
  • the actuator projection 34 of the piezoactuator 35 is arranged at a distance 72, which is also referred to as a preliminary stroke, to the end of the control valve body 65 remote from the combustion chamber.
  • the control valve body 65 releases the pressure relief bore 60.
  • the piezoactuator 35 When the piezoactuator 35 is activated, it expands and, after overcoming the advance stroke 72, comes into contact with the control valve body 65.
  • the control valve body 65 In the activated state of the piezoactuator 35, the control valve body 65 is held in its closed position, in which it closes the pressure relief bore 60. In this case, the combustion chamber near the end of Steuerventilkorpers 65 is acted upon via the pressure relief hole 60 directly to the control chamber pressure.
  • the inventive fuel injectors make it possible to measure the injection in a closed-loop principle and to compensate for any drift. By omitting the flow restrictor used as a tolerance limiter in conventional systems, the larger injection tolerances are also compensated. An individual quantity error can be measured with a setting of the injector and read in as coding in a control unit.

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)

Abstract

L'invention concerne un injecteur de carburant comportant un corps d'injecteur (2) qui présente une chambre de pression (12), d'où du carburant sollicité en pression est prélevé pour être injecté dans la chambre de combustion d'un moteur à combustion interne, en fonction de la pression régnant dans un espace de commande, lorsqu'une aiguille d'injecteur (10) se soulève de son siège. La pression est régulée par un actionneur (35) par l'intermédiaire d'un corps de soupape de distribution (25), qui peut passer d'une position fermée à une position ouverte afin de libérer une liaison d'écoulement entre un espace de commande (14) et une chambre de décompression (22). Afin de mettre au point un injecteur de carburant, de structure simple et économique à produire, le corps de soupape de distribution (25) est sollicité directement par la pression régnant dans l'espace de commande, c.-à-d. sans intercalage d'un dispositif d'étranglement.
PCT/EP2007/050777 2006-03-24 2007-01-26 Injecteur de carburant WO2007110256A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006013702.7 2006-03-24
DE200610013702 DE102006013702A1 (de) 2006-03-24 2006-03-24 Kraftstoffinjektor

Publications (1)

Publication Number Publication Date
WO2007110256A1 true WO2007110256A1 (fr) 2007-10-04

Family

ID=37909377

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/050777 WO2007110256A1 (fr) 2006-03-24 2007-01-26 Injecteur de carburant

Country Status (2)

Country Link
DE (1) DE102006013702A1 (fr)
WO (1) WO2007110256A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115680956A (zh) * 2022-08-31 2023-02-03 重庆红江机械有限责任公司 一种适合增材制造的船用柴油机冷却型针阀体

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7866575B2 (en) * 2009-01-12 2011-01-11 GM Global Technology Operations LLC Pressure actuated fuel injector

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0331198A2 (fr) * 1988-03-04 1989-09-06 Yamaha Motor Co., Ltd. Injecteur de carburant du type accumulateur
DE19624001A1 (de) * 1996-06-15 1997-12-18 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
WO2004051071A1 (fr) * 2002-12-05 2004-06-17 Robert Bosch Gmbh Dispositif d'injection de carburant comportant une soupape de commande 3/3 voies pour la modulation du processus d'injection
DE102004028618A1 (de) * 2004-06-12 2005-12-29 Robert Bosch Gmbh Common-Rail-Injektor
WO2006053810A1 (fr) * 2004-11-17 2006-05-26 Robert Bosch Gmbh Dispositif d'injection de carburant

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0331198A2 (fr) * 1988-03-04 1989-09-06 Yamaha Motor Co., Ltd. Injecteur de carburant du type accumulateur
DE19624001A1 (de) * 1996-06-15 1997-12-18 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
WO2004051071A1 (fr) * 2002-12-05 2004-06-17 Robert Bosch Gmbh Dispositif d'injection de carburant comportant une soupape de commande 3/3 voies pour la modulation du processus d'injection
DE102004028618A1 (de) * 2004-06-12 2005-12-29 Robert Bosch Gmbh Common-Rail-Injektor
WO2006053810A1 (fr) * 2004-11-17 2006-05-26 Robert Bosch Gmbh Dispositif d'injection de carburant

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115680956A (zh) * 2022-08-31 2023-02-03 重庆红江机械有限责任公司 一种适合增材制造的船用柴油机冷却型针阀体

Also Published As

Publication number Publication date
DE102006013702A1 (de) 2007-09-27

Similar Documents

Publication Publication Date Title
WO2007068526A1 (fr) Injecteur de carburant
EP1714025A1 (fr) Injecteur de carburant avec obturateur d'injection a commande directe
EP3207243A1 (fr) Injecteur piezo à rampe commune à compensation de jeu hydraulique intégré dans la servosoupape
EP1766225B1 (fr) Injecteur "common rail"
EP1117921B1 (fr) Injecteur de carburant pour un système carburant à rampe commune
DE19936669A1 (de) Common-Rail-Injektor
WO2007110256A1 (fr) Injecteur de carburant
EP1537327A1 (fr) Injecteur pour injecter du carburant dans les chambres de combustion de moteurs a combustion interne, en particulier injecteur du type a rampe commune d'alimentation (common rail) commande par servo-soupape
EP1740822B1 (fr) Injecteur common rail
DE10305509A1 (de) Kraftstoffeinspritzventil für eine Brennkraftmaschine
DE102007011788A1 (de) Kraftstoffinjektor
EP1313945B1 (fr) Soupape d'injection pour l'injection de carburant dans un moteur a combustion interne et procede pour commander l'ouverture et la fermeture d'une aiguille d'une soupape d'injection
EP1916412A2 (fr) Actionneur avec isolation de fluide
DE102006022802A1 (de) Kraftstoffinjektor
DE10305508A1 (de) Kraftstoffeinspritzventil für eine Brennkraftmaschine sowie Verfahren zum Betreiben einer Brennkraftmaschine
EP1387953A1 (fr) Injecteur de carburant comprenant des obturateurs de commande montes en serie
EP1865195A1 (fr) Dispositif destiné à la vaporisation de carburant
DE102006034112A1 (de) Kraftstoffinjektor
DE10147493A1 (de) Ventil zum Steuern von Flüssigkeiten
EP1131551A1 (fr) Injecteur a rampe commune d'injection
EP1606511A1 (fr) Dispositif d'injection de carburant pour moteur a combustion interne
DE10309078A1 (de) Kraftstoffeinspritzventil für eine Brennkraftmaschine
EP1555425A1 (fr) Injecteur de carburant
WO2012171767A1 (fr) Injecteur, en particulier injecteur de carburant pour un moteur à combustion interne
DE102008042171A1 (de) Brennstoffeinspritzventil

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07704168

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 07704168

Country of ref document: EP

Kind code of ref document: A1