EP1343965B1 - Systeme d'injection haute pression con u sous la forme d'un papillon de commande sous forme de papillon en cascade - Google Patents

Systeme d'injection haute pression con u sous la forme d'un papillon de commande sous forme de papillon en cascade Download PDF

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Publication number
EP1343965B1
EP1343965B1 EP01989404A EP01989404A EP1343965B1 EP 1343965 B1 EP1343965 B1 EP 1343965B1 EP 01989404 A EP01989404 A EP 01989404A EP 01989404 A EP01989404 A EP 01989404A EP 1343965 B1 EP1343965 B1 EP 1343965B1
Authority
EP
European Patent Office
Prior art keywords
throttle
valve
inlet
control chamber
pressure
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
Application number
EP01989404A
Other languages
German (de)
English (en)
Other versions
EP1343965A1 (fr
Inventor
Michael Von Dirke
Wendelin KLÜGL
Dirk Baranowski
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 EP1343965A1 publication Critical patent/EP1343965A1/fr
Application granted granted Critical
Publication of EP1343965B1 publication Critical patent/EP1343965B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0043—Two-way valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B2013/008—Throttling member profiles

Definitions

  • the present invention relates to a high-pressure injection system with execution of a control throttle as cascade throttle and in particular a high-pressure injection system of the type Common Rail injection system of a direct injection diesel engine.
  • High-pressure accumulator injection systems also known as common Rail injection systems called, stand opposite each other conventional injection systems characterized in that the injection pressure be generated regardless of the engine speed can.
  • the decoupling of pressure generation and injection is realized with the help of a storage volume, in the fuel is provided under high pressure.
  • the height Pressure in the storage volume is by means of a high-pressure pump generated.
  • a control piston in the control chamber is displaceable stored, one end of which is connected to the nozzle needle is and the other end in the control chamber with Pressure is applied.
  • the pressure in the control chamber is via a connecting line by the pressure in the storage volume generated.
  • control chamber For pressure relief, the control chamber with a Valve connected. Furthermore, there are between storage volumes and control chamber an inlet throttle and between the control chamber and a valve provided an outlet throttle to a predetermined Pressure build-up or -down in the control chamber after To close or open the valve.
  • Such System is known from EP-A-0 976 924.
  • the outlet throttle is designed such that the cavitation transition point, So the back pressure, when it falls below the flow through the throttle due to cavitation is not can be further increased and thus independent of in the flow direction behind the throttle prevailing back pressure is as high as possible.
  • the outlet throttle kavitiert with open valve (low back pressure) and the flow through the throttle and thus the movement of the Control piston is independent of the valve flow cross section.
  • the predetermined pressure buildup / removal in the control chamber creates a controlled movement of the spool and the associated nozzle needle.
  • Controlled means in that the time of the start of movement when opening and closing as well as the speed of movement even by the size of the pressurized cross-sectional areas from spool and nozzle needle as well as through the Fuel pressure in the storage volume and the flow characteristics the throttles, in particular flow resistance and cavitation point, can be specified.
  • the reproducible Injecting defined fuel quantities with high Precision thus requires a high manufacturing accuracy of Control piston and throttles.
  • the relatively large cross-sectional areas the control piston can be made very accurate; the production of chokes with low manufacturing tolerance requires, however, a very high cost, as follows is explained.
  • Throttles are in the form of cylindrical cross-sectional constrictions in the flow path between the control chamber and storage volume or realized between control chamber and valve.
  • Such conventional chokes typically have a length of approx. 1 mm and have a throttle passage of typically 0.3 mm diameter.
  • the throttle passage for example produced by drilling or by electrochemical etching.
  • the throttle length per se is for the flow characteristics the throttle of secondary importance.
  • the flow characteristics are not only by the Diameter of the throttle passage, but also by a possible conicity, the shape of entry and exit edges as well determines the surface condition of the throttle passage.
  • the setting of the function of the throttle determining Flow resistance to the setpoint occurs through hydroerosive rounding of the inlet edges of the throttle. throttle with only small tolerances and consistent quality in the flow parameters are accordingly only high To produce effort. In practice, must be at the throttle production calculated with a correspondingly high reject rate become.
  • the invention has the object, the production engineering effort in the production of storage injection systems, in particular with regard to the throttles, to reduce.
  • the inlet throttle of a storage injection system executed as a multi-stage throttle.
  • the structure of the inlet throttle in the form of several throttle stages or of in series switched chokes allows greater manufacturing tolerances in the production of individual throttles or throttle stages, without doing the flow characteristics of such formed inlet throttle are impaired. Consequently are the requirements for the manufacturing tolerance of a single Throttle stage or throttle and thus the inlet throttle itself significantly reduced, resulting in a lower production cost in the manufacture of the storage injection device according to the invention is achieved.
  • the lower requirements for the manufacturing tolerance of the multi-stage throttle is as follows:
  • A is the cross-sectional area
  • ⁇ A is the manufacturing tolerance
  • Q is the flow
  • ⁇ Q is the dispersion of the flow Q.
  • the individual throttles of an N-stage inlet throttle thus have a factor N enlarged flow cross-section with respect to an inlet throttle designed as a single throttle.
  • the dispersion of the flow of an N-stage throttle falls accordingly to the Nth part of the value of a single throttle running inlet throttle off.
  • the design of the inlet throttle as a multi-stage throttle thus individual throttles on the one hand higher flow cross section and on the other hand greater manufacturing tolerance be used.
  • the multi-stage design of the inlet throttle also reduces the pressure drop at the individual throttle stages in an advantageous manner.
  • the pressure drop of the throttle stages is between 17% and 25% of the total pressure drop and with a 10-stage throttle only between 5% and 9% of the total pressure drop. In the inlet throttle cavitation in an advantageous manner can thus be largely avoided.
  • Inlet throttle designed as a separate Kaskadendrossel.
  • Such a design promotes the compact design of Memory injector.
  • the design of the multi-level Throttle as a separate, usable device in Form of a cascade throttle also facilitates handling or the installation of the throttle in the manufacturing process.
  • the Multi-stage inlet throttle from a plurality of identical individual throttles or throttle elements constructed.
  • the same use Single throttles or throttle elements allow rationalization the production.
  • the flow cross section a single throttle or a throttle element so be chosen that different total flow cross sections the inlet throttle, for example, at different Types of storage injectors used can come only by varying the number of individual throttles or throttle elements can be realized.
  • Such a modular construction of the inlet throttle is the Number of different components reduced and more variable Adjustability in terms of flow resistance achieved.
  • the individual throttles or throttle elements are aligned with each other, that their throttle passages arranged offset from one another are. This ensures that the throttle effect a throttle or a single throttle element substantially unaffected by the effect of the other restrictors or throttle elements takes place.
  • the flow characteristics of the Multi-stage throttle can thus be more accurately predetermined and unwanted or unpredictable interactions between The throttle elements are largely excluded.
  • FIG. 1 shows a schematically represented invention Storage injection device 1, the example of Art a Common Rail Einspritzsytems with 2/2-way piezo valve is executed.
  • the accumulator injection device 1 comprises a high pressure accumulator 2a, a high pressure line 2, an injection valve 3, as well as means 8 for hydraulic control of the injection valve 3.
  • a control means 8 are a control chamber 9, with the high pressure accumulator 2a via a high pressure line 2 is connected, as well as with the Control chamber connected valve 10 is provided.
  • the valve 10 is actuated via a piezoelectric actuator 11.
  • Reference numeral 12 represents a schematic illustration of the electronic Actuation of the piezoelectric actuator 11 is.
  • a control piston 14 is displaceable stored in the control chamber 9.
  • One end 15 of the control piston 14 is the pressure of the Control chamber 9 applied and its other end 16 acts on a nozzle needle 5 of the injection valve 3.
  • the nozzle needle 5 is movably mounted in the injection valve 3 to nozzle openings 6 of the injection valve 3 to release or cover.
  • the nozzle needle 6 is by a spring 7 against the valve seat biased the injection valve 3.
  • the injection valve 3 is via a supply line 7 with fuel from the high-pressure accumulator 2a fed.
  • the throttles 19, 20 allow the setting of predetermined flow parameters of Fuel during inflow or outflow of the fuel from the control chamber 9.
  • the inlet throttle 19 is according to the invention executed in the form of a multi-stage throttle.
  • valve 10 When the valve 10 is closed flows from the high-pressure accumulator 2a and the high pressure line 2 fuel via the inlet throttle 19 in the control chamber 9. This is in the control chamber 9 a corresponding fuel pressure of the high-pressure accumulator 2a constructed and thus the control piston 14 at its control piston side end 16 with the pressure of the control chamber. 9 applied.
  • a movement of the control piston 14th in the direction of the nozzle openings 6 of the injection valve 3 causes the via the nozzle needle end 15 of the control piston 14 is transmitted to the nozzle needle 5.
  • the nozzle needle 5 closes the nozzle openings 6 of the injection valve 3 against the pressure of the fuel to be injected.
  • Precise timing of the Opening and closing operation of the injection valve is by an accurate adjustment of the flow conditions Inlet and outlet throttle ensured.
  • the inventive Design of the inlet throttle 19 as a multi-stage throttle ensures a sufficient setting accuracy of the flow resistance at reduced production costs.
  • FIG 2 shows an enlarged view of the multi-stage Inlet throttle 19 of the storage injection device according to the invention 1 of Figure 1.
  • the multi-stage inlet throttle 19 is constructed of a plurality of throttle elements 22, for example arranged in a cylindrical housing 21 are.
  • the two open ends of the housing 21 are inlet or drain opening of the throttle 19.
  • the exemplary throttle elements 21 are disc-shaped and have throttle passages 23 on.
  • the Throttle passage 23 in the form of a depression or a groove in the lateral surface of the disk-shaped throttle element 22nd executed, wherein a defined flow cross section of the Throttle element 22 by interaction of the groove with the inner Lateral surface of the cylindrical housing 21 in the housing inserted state is given.
  • the bushings or Passages can also be used as through holes or other quer4.000sverengende embodiments of the throttle elements be executed.
  • spacer means 24 are provided which a minimum distance ensure the throttle elements 22 to each other.
  • the spacer means 24 may be integral with the throttle elements 22 formed or be provided on the housing 21.
  • the throttle elements 22 are preferably in the cylindrical Housing 21 aligned that the respective bushings 23 are arranged offset from one another. This will a largely independent throttle effect of a throttle element 22 compared to the other throttle elements 22 created.
  • the multi-stage shown in the embodiment Throttle 19 is designed as a separate component and can in the manufacture of the storage injection device according to the invention 1 are installed in the same with little effort.

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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)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (6)

  1. Système d'injection à réservoir avec au moins un réservoir à haute pression (2a), une chambre de commande (9) avec un piston pilote (14), une soupape (10), et une soupape d'injection (3) comprenant une aiguille d'injecteur (5), la soupape d'injection (3) étant commandée au moyen de la chambre de commande (9) et du piston pilote (14) et la chambre de commande (9) étant reliée avec le réservoir à haute pression (2a) via un organe d'étranglement d'admission (19) ainsi qu'avec la soupape (10) via un organe d'étranglement de refoulement (20), caractérisé en ce que l'organe d'étranglement d'admission (19) est réalisé comme un organe d'étranglement à étages multiples.
  2. Dispositif d'injection à réservoir selon la revendication 1, caractérisé en ce que l'organe d'étranglement d'admission (19) est un organe d'étranglement en cascade.
  3. Dispositif d'injection à réservoir selon la revendication 1 ou 2, caractérisé en ce que l'organe d'étranglement d'admission (19) à étages multiples est réalisé à partir de plusieurs organes d'étranglement individuels identiques (22) et/ou d'éléments d'organe d'étranglement (22).
  4. Dispositif d'injection à réservoir selon au moins une des revendications 1 à 3, caractérisé en ce que les organes d'étranglement individuels (22) ou les éléments d'organe d'étranglement (22) de l'organe d'étranglement d'admission (19) à étages multiples sont ajustés ensemble de telle façon que leurs passages d'étranglement (23) sont disposés de façon décalée les uns par rapport aux autres.
  5. Dispositif d'injection à réservoir selon au moins une des revendications 1 à 4, caractérisé en ce que l'organe d'étranglement d'admission (19) à étages multiples comprend des éléments d'organe d'étranglement (22) en forme de disque avec des passages d'étranglement (23) sous forme d'encoche et qui sont disposés dans un boítier (21) à la manière d'un circuit en série.
  6. Dispositif d'injection à réservoir selon au moins une des revendications 1 à 5, caractérisé en ce que des moyens de séparation (24) sont prévus entre les éléments d'organe d'étranglement (22).
EP01989404A 2000-12-20 2001-12-13 Systeme d'injection haute pression con u sous la forme d'un papillon de commande sous forme de papillon en cascade Expired - Lifetime EP1343965B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10063698A DE10063698A1 (de) 2000-12-20 2000-12-20 Hochdruckeinspritzsystem mit Ausführung einer Steuerdrossel als Kaskadendrossel
DE10063698 2000-12-20
PCT/DE2001/004703 WO2002050423A1 (fr) 2000-12-20 2001-12-13 Systeme d'injection haute pression conçu sous la forme d'un papillon de commande sous forme de papillon en cascade

Publications (2)

Publication Number Publication Date
EP1343965A1 EP1343965A1 (fr) 2003-09-17
EP1343965B1 true EP1343965B1 (fr) 2005-11-23

Family

ID=7668067

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01989404A Expired - Lifetime EP1343965B1 (fr) 2000-12-20 2001-12-13 Systeme d'injection haute pression con u sous la forme d'un papillon de commande sous forme de papillon en cascade

Country Status (4)

Country Link
US (1) US7216629B2 (fr)
EP (1) EP1343965B1 (fr)
DE (2) DE10063698A1 (fr)
WO (1) WO2002050423A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10063698A1 (de) 2000-12-20 2002-07-04 Siemens Ag Hochdruckeinspritzsystem mit Ausführung einer Steuerdrossel als Kaskadendrossel
DE102007042466B3 (de) * 2007-09-06 2009-04-09 Continental Automotive Gmbh Einspritzsystem mit reduzierter Schaltleckage und Verfahren zum Herstellen eines Einspritzsystems
JP2019148193A (ja) * 2018-02-26 2019-09-05 株式会社Ｓｏｋｅｎ 燃料噴射装置

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4118156A (en) * 1976-12-01 1978-10-03 Sulzer Brothers Limited Fuel injection pump having choke means in overflow line
US4526151A (en) * 1982-03-12 1985-07-02 Mitsubishi Jukogyo Kabushiki Kaisha Fuel injection device
DE29508392U1 (de) * 1995-05-19 1995-08-10 Heilmeier & Weinlein Fabrik für Oel-Hydraulik GmbH & Co KG, 81673 München Elektrohydraulisches Hubmodul
DE29508395U1 (de) * 1995-05-19 1995-08-10 Heilmeier & Weinlein Fabrik für Oel-Hydraulik GmbH & Co KG, 81673 München Hydraulisches Dämpfungsventil
DE29518547U1 (de) * 1995-11-22 1996-01-11 Heilmeier & Weinlein Fabrik für Oel-Hydraulik GmbH & Co KG, 81673 München Kaskadendrossel
JP3653882B2 (ja) * 1996-08-31 2005-06-02 いすゞ自動車株式会社 エンジンの燃料噴射装置
EP0976924B1 (fr) * 1998-07-31 2003-09-17 Siemens Aktiengesellschaft Injecteur avec une servovalve
JP3763698B2 (ja) * 1998-10-22 2006-04-05 株式会社日本自動車部品総合研究所 圧力脈動を緩和し得る燃料供給システムの設計方法
GB9905896D0 (en) * 1999-03-16 1999-05-05 Lucas Ind Plc Fuel injector arrangement
DE19939418A1 (de) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Kraftstoffeinspritzsystem für eine Brennkraftmaschine
DE19939419A1 (de) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Kraftstoffeinspritzeinrichtung
FI112527B (fi) * 1999-12-16 2003-12-15 Waertsilae Finland Oy Ruiskutusventtiilijärjestely
DE10063698A1 (de) 2000-12-20 2002-07-04 Siemens Ag Hochdruckeinspritzsystem mit Ausführung einer Steuerdrossel als Kaskadendrossel

Also Published As

Publication number Publication date
DE10063698A1 (de) 2002-07-04
US20040035950A1 (en) 2004-02-26
US7216629B2 (en) 2007-05-15
EP1343965A1 (fr) 2003-09-17
DE50108204D1 (de) 2005-12-29
WO2002050423A1 (fr) 2002-06-27

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