EP1831539A1 - Injecteur de carburant avec commande directe de l'element d'injecteur - Google Patents

Injecteur de carburant avec commande directe de l'element d'injecteur

Info

Publication number
EP1831539A1
EP1831539A1 EP05819005A EP05819005A EP1831539A1 EP 1831539 A1 EP1831539 A1 EP 1831539A1 EP 05819005 A EP05819005 A EP 05819005A EP 05819005 A EP05819005 A EP 05819005A EP 1831539 A1 EP1831539 A1 EP 1831539A1
Authority
EP
European Patent Office
Prior art keywords
injection valve
piston
valve member
fuel injector
booster
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
Application number
EP05819005A
Other languages
German (de)
English (en)
Other versions
EP1831539B1 (fr
Inventor
Friedrich Boecking
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.)
Robert Bosch GmbH
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 EP1831539A1 publication Critical patent/EP1831539A1/fr
Application granted granted Critical
Publication of EP1831539B1 publication Critical patent/EP1831539B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/705—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with means for filling or emptying hydraulic chamber, e.g. for compensating clearance or thermal expansion
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/167—Means for compensating clearance or thermal expansion

Definitions

  • the invention relates to a fuel injector with direct control of the injection valve member according to the preamble of claim 1.
  • the fuel injector comprises an actuator which actuates an injection valve member directly, which acts on the injection valve member, which is acted upon by a spring element in the closing direction.
  • the fuel injector includes a hydraulic coupling space that hydraulically connects a booster piston and the injection valve member.
  • a sleeve-shaped body is supported, which cooperates with an edge forming a sacredhubs republic the injection valve member edge.
  • the sleeve-shaped body is movable relative to the injection valve member.
  • the fuel injection device comprises an injection valve which has a valve needle for opening and closing injection openings.
  • a fuel injecting valve when operating under high pressure fuel supply line and an actuator and a hydraulic coupler having two cooperating via a coupling of a coupler, arranged linearly one behind the other piston.
  • the coupler volume of the coupler is formed by leading columns of pistons arranged one behind the other through high-pressure fuel.
  • a filling space is arranged in each case and connected to a line, one of the pistons having a first cross-sectional area being connected to the actuator via a rod with an injection valve member designed as a nozzle needle.
  • the two other ends of the pistons engage in associated compartments, which communicate hydraulically with each other via a duct.
  • a fuel injector for high-pressure accumulator injection systems which has a direct needle control, in which for opening an injectable as a nozzle needle injection valve member between an actuator, such as a piezoelectric actuator, and the injection valve member no hydraulic valve is interposed, with the Opening the injection valve member, the pressure in a control room is relieved.
  • the actuator which is preferably a piezoelectric actuator having a piezocrystal stack, is controlled inversely, the actuator being energized in the closed state of the injection valve member designed as a nozzle needle.
  • the actuator is switched to a de-energized state, so that the length of the piezocrystal stack of the actuator is reduced.
  • a reduction in pressure is brought about, which in turn entails an opening of the injection valve member which can be embodied as a nozzle needle.
  • a booster piston assigned to the actuator has a control chamber sleeve surrounding it, as a result of which an control chamber which is otherwise to be formed in the body of the fuel injector can be saved.
  • the booster piston is advantageously designed in such a way that it acts both on an internally formed booster chamber and on an external control chamber in relation to the injection valve member. From the outside arranged control chamber, fuel flows into a rear space, which acts on the injection valve member which can be embodied as a nozzle needle.
  • the actuator In the closed position of the injection valve member which can be embodied as a nozzle needle, the actuator is energized. If the energization of the actuator is removed, the length of the piezocrystal stack is reduced, as a result of which the booster piston is withdrawn via a spring element assigned to it and the pressure in the internal booster chamber lowers. The reduction in pressure in the interrupter compartment results in a piston surrounding the injection valve member moving into the interrupter compartment. Due to the cancellation of the energization of the actuator and the pressure in a control chamber is lowered, as well as in a trained within the piston rear space of the injection needle member can be formed as a nozzle needle.
  • the rear space and the control chamber are fluidically connected to each other via a channel containing a throttle point.
  • the injection valve member that can be formed as a nozzle needle is also pulled open, which is pulled along by a stop that can be embodied as a sleeve during the upward movement of the piston.
  • the injection valve member which can be embodied as a nozzle needle lifts it from the stop formed as a sleeve and continues to open.
  • the actuator is energized again so that the booster piston, which houses both the booster chamber and the booster piston
  • Control room acted upon, moved back towards these rooms and causes a pressure increase in these.
  • About the channel contained a throttle between the
  • the injection valve member is returned to its closed position and thus seals the opening into the combustion chamber of the internal combustion engine Einspritzöffhungen.
  • opening of the injection valve member which can be embodied as a nozzle needle is achieved by forcibly entraining it upon depressurization of the booster chamber and a further opening movement of the injection valve member is brought about by the back chamber of the injection valve member depressurizing the control chamber is relieved of pressure.
  • the intensifier piston is retracted both into the booster chamber and into the control chamber, whereby the piston surrounding the injection valve member is pressurized and the back chamber of the injection valve member is pressurized.
  • a fuel injector which enables direct control of the injection valve member that can be embodied as a nozzle needle with an extremely compact installation space.
  • the proposed fuel injector is characterized by a small number of components and a low overall height, which is due to the fact that a hydraulic valve can be omitted for actuating the injection valve member which can be embodied as a nozzle needle.
  • FIG. 1 shows a section through the inventively proposed fuel injector with direct control of the injection valve member and inverse control of an actuator
  • FIG. 2 shows a further embodiment variant of the fuel injector proposed according to the invention.
  • FIG. 1 shows a fuel injector 10 which has a cavity 12 in which an actuator 14, which is preferably designed as a piezoactuator, is accommodated.
  • the actuator 14, preferably a piezoactuator, comprises a number of stacked stacked piezocrystals and is controlled inversely. This means that the actuator 14 is energized in the closed state of a injection valve member 48 designed as a nozzle needle, that is to say in the case of closed injection openings 86, whereas it is switched to an open state to open the injection valve member 48, which takes place via control not shown in the drawing ,
  • a booster piston 24 designed as a tubular spring spring element 16 is employed.
  • the booster piston 24 has an annular surface 28, which engages over a further spring element 30, which in turn engages over a control chamber sleeve 31.
  • the control chamber sleeve 31 is employed with a biting edge 84 to a first end face 70 of a washer 68 of the fuel injector 10.
  • the control piston 24 has an extension 32 which on the one hand serves as a guide for an inner spring element 34 and on the other hand delimits a translator chamber 36 formed by an inner peripheral surface 40 of the booster piston 24 and a piston 44.
  • Ü Bersetzerraum 36 there is a pressure level, which is designated P 1 .
  • the pressurized via the supply line 20 under high pressure fuel cavity 12 of the fuel injector 10 has an inlet 38, 74, via which the fuel from the cavity 12 a nozzle chamber 78 flows.
  • the nozzle chamber 78 surrounds the injection valve member 48 which can be formed as a nozzle needle.
  • the booster piston 24 also has an annular surface 42 which delimits a control chamber 46.
  • the control chamber 46 is limited by the mentioned annular surface 42 of the booster piston 24 and by the inner peripheral surface of the control chamber sleeve 31 and the washer 68 of the fuel injector 10.
  • the enclosing the piston 44 Control chamber 46 is connected via a channel in which a throttle point 56 is formed with a rear space 54 in connection.
  • an injector member 48 which can be embodied as a nozzle needle is accommodated.
  • the closing spring 52 is supported on the one hand on an end face 50 of the injection valve member 48 and on the other hand on the inside of the piston 44 from.
  • About the channel with orifice 56 are the back space 54, in which a pressure level p 3 prevails and the control chamber 46, in which a pressure level of p 2 prevails, with each other in hydraulic communication.
  • the injection valve member 48 which can be formed as a nozzle needle is movably received.
  • a bell 60 located on the piston 44 on the side facing the nozzle chamber 78 a bell 60, which may be non-positively or positively connected to a caulking 58 with the piston 44.
  • the bell 60 in the lower region of the piston 44 encloses a stop 62 which can be embodied as a sleeve.
  • the injection valve member 48 which can be embodied as a nozzle needle is movably guided in the axial direction.
  • the stop 62 which can be embodied as a sleeve comprises a first side 64 and a second side 66 facing the bell 60.
  • the piston 44 with the bell 60 accommodated on the latter is movably guided in the nozzle body 76 of the fuel injector 10 in the vertical direction.
  • Reference numeral 90 denotes a guide surface between the booster piston 24 and the piston 44 surrounding the injection valve member 48.
  • the actuator 14, which acts on the end face 26 of the booster piston 24, is driven inversely. This means that the actuator 14 is energized in the closed state of the injection valve member 48, however, is not energized to open the injection valve member 48 can be formed as a nozzle needle.
  • the injection valve member 48 When energized actuator 14 and consequently closed injection valve member 48, the injection valve member 48 is placed in its the injection ports 86 closing seat 82.
  • the stacked piezocrystals of the actuator 14 are elongated against the action of the formable as a tubular spring spring element 16.
  • the end face 26 of the booster piston 24 is acted upon by the piezoelectric actuator 14.
  • the booster piston 24 thus maintains a pressure in the booster chamber 36 and is retracted with its annular surface 42 into the control chamber 46, so that in this also an increased pressure prevails.
  • the increased pressure prevailing in the control chamber 46 lies above the channel, which raum 54 hydraulically connects to the control chamber 46 at.
  • both the piston 44 is pressurized and the end face 50 of the injection valve member designed as a nozzle needle 48.
  • the injection valve member 48 which can be embodied as a nozzle needle, it rests against the first side 64 of the stop 62 which can be embodied as a sleeve.
  • the formable as a sleeve stop 62 is also fixed by the bell 60 on its second side 66.
  • the piston 44 together with the bell 60 received thereon is placed in the nozzle body 76 due to the pressure prevailing in the booster chamber 36 pressure and is in its lower stop position.
  • the energization of the actuator 14 is indicated, so that the length of the piezocrystal stack of the actuator 14 is reduced. Due to the action of the formable as a tubular spring spring element 16 of the booster piston 24 is pulled into the cavity 12. This is accompanied both a pressure relief of the booster chamber 36 by extending the extension 32 from this, as well as a pressure relief of the control chamber 46 by extending the annular surface 42 of the booster piston 24 from this. Due to the pressure relief in the control chamber 46, a, albeit time-delayed, pressure relief of the back space 54 takes place on the back of the injection valve member 48 which can be embodied as a nozzle needle.
  • the formable as a sleeve stop 62 allows on the one hand at pressure relief of the booster chamber 36 entrainment movement of the formable as a nozzle needle injection valve member 48 at Auffahrschul of the piston 44 in the booster chamber 36; On the other hand, lifting of the injector valve element 48 that can be embodied as a nozzle needle is made possible by the first side 64 of the stop 62 when the back space 54 is relieved of pressure and the control chamber 46 is relieved of pressure.
  • the opening movement of the injection valve member 48 when the actuator 14 is de-energized accordingly takes place by a superimposition of the upward movement of the piston 44 in the booster chamber 36 at pressure relief and at parallel running pressure relief of the back space 54 in the likewise pressure-relieved control chamber 46, whereby the end face 50 the injection valve member 48 on enters the rear space 54.
  • control chamber sleeve 31 is formed so that it on the one hand limits the booster chamber 36 and on the other hand together with the annular surface 42 of the Ü bersetzerkolbens 24 and a surface region of a first planar surface 70 of the intermediate disc 68 forms the control chamber 46.
  • a second plane surface of the washer 68 is designated by reference numeral 72.
  • control chamber 46 Due to the interconnectedness of the booster piston 24 and the guided therein, acted upon by the inner spring element 34 piston 44, a particularly compact construction of a direct actuation of the injection valve member 48 enabling fuel injector 10 can be provided, in which advantageously the control chamber 46 by use a movable relative to the booster piston 24 control chamber sleeve 31 is formed. This allows the waiver of the production of the control chamber 46 in the injector body. Through the control chamber sleeve 31, the control chamber 46 can be formed in the cavity 12 of the fuel injector 10.
  • Calking 58 between the bell 60 and the KoI- ben 44 can also be a different type of connection can be selected to connect the bell 60 with the piston 44.
  • a cohesive connection in the form of a weld between the piston 44 and the bell 60 may be formed, wherein the material connection after insertion of the injector valve 48 can be formed as a nozzle needle and subsequent assembly of the stopper 62 between the Koi Ben 44 and the bell 60 is made.
  • the stroke of the injection valve member 48 can be defined relative to the piston 44.
  • FIG. 2 shows a further embodiment variant of the fuel injector proposed according to the invention.
  • a pressure booster 100 comprises only two hydraulic chambers, namely the rear chamber 54 and the control chamber 46, while in the embodiment variant illustrated in FIG. 1 the pressure booster 100 comprises the booster chamber 36, the control chamber 46 and the rear chamber 54.
  • the actuator 14 is accommodated in a cavity 12 in the embodiment variant shown in FIG. 2, which is acted upon by the supply line 20 with fuel under system pressure.
  • the fuel under system pressure flows through the injector body to the channels 74, which open into the nozzle chamber 78.
  • a pressure stage 92 which is formed on the needle-shaped injection valve member 48 formed.
  • the rear space 54 and the control chamber 46 communicate via a channel 94 with throttle point 56.
  • the injection valve member 48 according to the embodiment in Figure 2 comprises a piston-shaped projection 44 which is enclosed by an annular surface 98 of the booster piston 24.
  • the piston-shaped projection 44 of the injection valve member 48 rests on the annular surface 98 of the booster piston 24. From the nozzle chamber 78, an annular gap extends from the seat 82 of the injection valve member 48. In the closed position of the injection valve member 48, which can be embodied as a nozzle needle, the injection orifices 86 formed below the seat 82 and opening into the combustion chamber 88 are closed.
  • the piston-shaped projection 44 of the injection valve member 48 lifts from the annular surface 98 and moves, guided in a piston guide 96 of the transmission piston 24, with its end face 50 in the rear space 54, whereby the injector valve can be formed as a nozzle needle 48 quickly opens completely with minimal stroke of the actuator 14.
  • the embodiment of the fuel injector shown in FIG. 2 comprises a pressure booster 100 having two hydraulic chambers, namely the rear chamber 54 and the control chamber 46, which are hydraulically connected to one another via a duct system with throttle restriction 56. bond.
  • the booster piston 42 surrounds the piston. benförmigen projection 44 on the injection valve member 48 having an annular surface 98.
  • preferably designed as a nozzle needle injection valve member 48 is wound by the inverse actuated actuator 14 at partial or complete cancellation of the energization thereof, the further opening of the injection valve member 48 according to the embodiment in FIG 1 by retracting into the rear space 54 and according to the embodiment in Figure 2 by retracting the end face 50 of the piston-shaped projection 44 of the injection valve member 48 is carried out in the rear space 54, which has a rapid opening of the preferably designed as a nozzle needle injection valve member 48 result.
  • Fuel injector 80 Tip Injector member 48 12 Cavity 82 Seat Injector member 48 14 Actuator (piezo actuator) 84 Bite edge 16 Spring 86 Injection port 88 Combustion chamber

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un injecteur de carburant (10) avec commande directe d'un élément d'injecteur (48). Un actionneur (14) est logé dans une cavité (12), alimentée en carburant sous haute pression par l'intermédiaire d'une source haute pression (22) placée à l'extérieur de l'injecteur de carburant (10). L'actionneur (14) est alimenté en courant en position de fermeture de l'élément d'injecteur (48) et non alimenté en courant en position d'ouverture de l'élément d'injecteur (48). Cet actionneur (14) agit directement sur un piston (24) d'un multiplicateur de pression (100), sollicitant la chambre (36) du multiplicateur. Une douille (31), délimitant une chambre de commande (46), est logée de façon mobile dans le piston (24) du multiplicateur.
EP05819005A 2004-12-23 2005-12-07 Injecteur de carburant avec commande directe de l'element d'injecteur Expired - Fee Related EP1831539B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004062007 2004-12-23
DE102005015997A DE102005015997A1 (de) 2004-12-23 2005-04-07 Kraftstoffinjektor mit direkter Steuerung des Einspritzventilgliedes
PCT/EP2005/056563 WO2006069899A1 (fr) 2004-12-23 2005-12-07 Injecteur de carburant avec commande directe de l'element d'injecteur

Publications (2)

Publication Number Publication Date
EP1831539A1 true EP1831539A1 (fr) 2007-09-12
EP1831539B1 EP1831539B1 (fr) 2010-03-31

Family

ID=36599471

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05819005A Expired - Fee Related EP1831539B1 (fr) 2004-12-23 2005-12-07 Injecteur de carburant avec commande directe de l'element d'injecteur

Country Status (4)

Country Link
US (1) US20100006675A1 (fr)
EP (1) EP1831539B1 (fr)
DE (2) DE102005015997A1 (fr)
WO (1) WO2006069899A1 (fr)

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JP5024320B2 (ja) * 2009-03-25 2012-09-12 株式会社デンソー 燃料噴射弁
WO2013045688A1 (fr) * 2011-10-01 2013-04-04 Robert Bosch Gmbh Soupape d'injection comportant un actionneur à bain d'huile et transmission hydraulique simplifiée
DE102012212266B4 (de) * 2012-07-13 2015-01-22 Continental Automotive Gmbh Fluidinjektor
DE102012212264B4 (de) 2012-07-13 2014-02-13 Continental Automotive Gmbh Verfahren zum Herstellen eines Festkörperaktuators
DE102013210843A1 (de) * 2013-06-11 2014-12-11 Continental Automotive Gmbh Injektor
DE102014209961A1 (de) * 2014-05-26 2015-11-26 Robert Bosch Gmbh Düsenbaugruppe für einen Kraftstoffinjektor sowie Kraftstoffinjektor
JP6187422B2 (ja) * 2014-09-17 2017-08-30 株式会社デンソー 燃料噴射弁
GB201420017D0 (en) * 2014-11-11 2014-12-24 Delphi International Operations Luxembourg S.�.R.L. Hydraulic lash adjuster arrangement ina servo injector
CN104500180B (zh) * 2014-12-03 2017-01-18 中国第一汽车股份有限公司无锡油泵油嘴研究所 一种气助可选式喷射器
US10750236B2 (en) * 2015-04-23 2020-08-18 The Nielsen Company (Us), Llc Automatic content recognition with local matching
GB2539401A (en) * 2015-06-15 2016-12-21 Delphi Int Operations Luxembourg Sarl Hydraulic lash adjuster arranged in a servo injector
US11067028B2 (en) * 2019-01-16 2021-07-20 Caterpillar Inc. Fuel injector

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Also Published As

Publication number Publication date
DE502005009337D1 (de) 2010-05-12
DE102005015997A1 (de) 2006-07-13
US20100006675A1 (en) 2010-01-14
EP1831539B1 (fr) 2010-03-31
WO2006069899A1 (fr) 2006-07-06

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