EP2027385B1 - Vorrichtung zum einspritzen von kraftstoff in den brennraum einer brennkraftmaschine - Google Patents

Vorrichtung zum einspritzen von kraftstoff in den brennraum einer brennkraftmaschine Download PDF

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Publication number
EP2027385B1
EP2027385B1 EP07718497A EP07718497A EP2027385B1 EP 2027385 B1 EP2027385 B1 EP 2027385B1 EP 07718497 A EP07718497 A EP 07718497A EP 07718497 A EP07718497 A EP 07718497A EP 2027385 B1 EP2027385 B1 EP 2027385B1
Authority
EP
European Patent Office
Prior art keywords
pressure
line
resonator
injector
accumulator
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.)
Active
Application number
EP07718497A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2027385A1 (de
Inventor
Heribert Kammerstetter
Jaroslav Hlousek
Christian Graspeuntner
Markus Kathan
Christian Meisl
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.)
AVL List GmbH
Robert Bosch GmbH
Original Assignee
AVL List GmbH
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
Priority claimed from AT10082006A external-priority patent/AT501573B1/de
Application filed by AVL List GmbH, Robert Bosch GmbH filed Critical AVL List GmbH
Publication of EP2027385A1 publication Critical patent/EP2027385A1/de
Application granted granted Critical
Publication of EP2027385B1 publication Critical patent/EP2027385B1/de
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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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
    • 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 device for injecting fuel into the combustion chamber of an internal combustion engine with at least one high-pressure accumulator, an injector, at least one high-pressure accumulator and the injector connecting high-pressure line and a parallel to the high-pressure line between the injector and high-pressure accumulator resonator connected, the high-pressure accumulator side has a resonator.
  • the DE 102 47 775 A1 addresses a problem that arises with multiple injection pulses per cycle when their time interval is only a few microseconds. Due to the pressure drop occurring with each injection, the resulting pressure waves are not sufficiently damped, which leads to uncontrollable irregularities in subsequent injections.
  • the problem is solved by means of a damping device which consists of a porous material, for example a sintered metal insert, on which the pressure waves be attenuated by multiple reflection and absorption.
  • the disadvantages are the pressure losses occurring in the process.
  • this throttle also has the effect of throttling the main flow as a side effect.
  • the system pressure existing in the rail can thus no longer be used in full for injection. The more effectively the throttle can dampen the pressure oscillations, the greater the pressure loss during the injection.
  • Valves are self-oscillating systems and thus have a pronounced time behavior, which is undesirable in injection systems as an additional source of interference.
  • As a mechanically moving elements valves are subject to tolerances and suffer in view of the high operating frequency under high signs of wear.
  • the common rail itself is already the largest existing in the system damping volume. Although a substantial reduction of the pressure oscillations could be achieved by increasing the rail volume. The disadvantage, however, is that the system then becomes very sluggish and rapid pressure changes are no longer easily possible.
  • the present invention aims to improve a device for injecting fuel into the combustion chamber of an internal combustion engine by simple, constructive means, wherein the harmful for the individual components pressure oscillations are avoided or can be reduced as quickly as possible.
  • the resonator is formed by a pressed-in in the high-pressure line bore insert, in particular in this formed. In this case, no separate hole for the resonator is required, so the production cost is significantly reduced. In addition, it is ensured in such a construction that the corresponding portions of the high-pressure line and the resonator line are the same length, so that after a reflection of the pressure waves at the point of connection to an extinction of the waves.
  • the resonator line is preferably designed as a central bore in the insert.
  • the cross sections of the insert and the high pressure line bore may have mutually different contours, so that between the insert and the wall of the high pressure line bore flow cross sections of the high pressure line are formed.
  • preferably at least two, more preferably three circular segment flow cross-sections are provided.
  • the flow cross section of the high pressure line should preferably correspond substantially to the flow cross section of the resonator line.
  • the length of the resonator line between the injector and the resonator throttle preferably corresponds substantially to the length of the high-pressure line between the injector and the inlet of the high-pressure line into the high-pressure accumulator.
  • a further preferred development provides that the length of the resonator line between the injector and the resonator throttle and the length of the high-pressure line between the injector and the inlet of the high-pressure line into the pressure accumulator is in each case an integer multiple of the wavelength of the pressure oscillation induced by the injector.
  • Fig. 1 schematically shows the structure of a common rail injector with a pressure swing damping according to a first embodiment
  • Fig. 2 an enlarged view of the lower injector area
  • Fig. 3 a modified design of the pressure oscillation damping
  • Fig. 4 a section along the line IV-IV of Fig. 3 and Fig. 5 the pressure curve in an injector according to the invention.
  • Fig. 1 and 2 schematically show the structure of a common rail injector consisting of a high-pressure accumulator 1, a servo valve 2, a throttle plate 3, and an injection nozzle 4.
  • the servo valve 2 closes in the idle state existing in the throttle plate 3 outlet throttle 5. This is in the control chamber 8, is connected via the high-pressure bore 7 and the inlet throttle 6 to the memory 1, the system pressure, so that the nozzle needle 10 is pressed against the nozzle body 9 manufactured in the nozzle seat 11 and the injection holes 12 are closed.
  • the outlet throttle 5 is released, and the fuel located in the control chamber reduces its pressure in the low-pressure system (not shown) from.
  • high-pressure fuel flows via the inlet throttle 6.
  • outlet throttle 5 and inlet throttle 6 are matched to one another so that upon actuation of the servo valve 2, the pressure in the control chamber 8 drops so far that acting on the lower part of the nozzle needle 10 pressure in the nozzle chamber 13, the nozzle needle 10 against the Pressure in the control chamber 8 and against the force of the nozzle spring 14 presses out of the nozzle seat 11 and the injection holes 12 are released, so that fuel is injected into the combustion chamber 15. After closing the servo valve 2, fuel can no longer flow out of the control chamber 8 via the outlet throttle 5, so that the pressure built up here presses the nozzle needle 10 back into the nozzle seat 11.
  • a resonator is used. This consists of a resonator 16, which has the same length and the same diameter as the high-pressure bore 7, and a resonator 17, which is attached to the memory end of the resonator 16 and this connects to the memory 1.
  • the pressure pulse produced at the nozzle seat propagates via the nozzle chamber 13 into the high-pressure bore 7 and the resonator bore 16.
  • Fig. 3 and 4 show the embodiment of an injector according to the invention.
  • the high-pressure line 7 which leads from the memory 1 via valve group 2 and throttle plate 3 to the injection nozzle 4
  • an insert 18 is pressed.
  • the cross section of the insert 18 is shown.
  • the high-pressure bore itself is designed in the form of several similar circular segment sections 19.
  • the resonator 16 In the axis of the insert 18 is the resonator 16, in which the resonator 17 is located at the memory end.
  • the entire cross-sectional area of the circular segment sections 19 is the same size as the cross-sectional area of the resonator bore 16 and the diameter of the resonator bore 16 is four times as large as the diameter of the resonator throttle 17.
  • Fig. 5 shows the course of the pressure 20 as a function of time 21 in the nozzle chamber 13.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP07718497A 2006-06-13 2007-06-13 Vorrichtung zum einspritzen von kraftstoff in den brennraum einer brennkraftmaschine Active EP2027385B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT10082006A AT501573B1 (de) 2006-06-13 2006-06-13 Hydraulische vorrichtung mit zumindest einem druckspeicher
AT0006507A AT503660B1 (de) 2006-06-13 2007-01-12 Vorrichtung zum einspritzen von kraftstoff in den brennraum einer brennkraftmaschine
PCT/AT2007/000286 WO2007143768A1 (de) 2006-06-13 2007-06-13 Vorrichtung zum einspritzen von kraftstoff in den brennraum einer brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP2027385A1 EP2027385A1 (de) 2009-02-25
EP2027385B1 true EP2027385B1 (de) 2010-03-31

Family

ID=38476151

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07718497A Active EP2027385B1 (de) 2006-06-13 2007-06-13 Vorrichtung zum einspritzen von kraftstoff in den brennraum einer brennkraftmaschine

Country Status (6)

Country Link
US (1) US7866300B2 (ja)
EP (1) EP2027385B1 (ja)
JP (1) JP4884529B2 (ja)
AT (2) AT503660B1 (ja)
DE (1) DE502007003315D1 (ja)
WO (1) WO2007143768A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022148679A1 (de) 2021-01-11 2022-07-14 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH702496B1 (de) 2010-05-07 2011-07-15 Liebherr Machines Bulle Sa Hochdruckinjektor.
DE102010039051A1 (de) * 2010-08-09 2012-02-09 Robert Bosch Gmbh Einspritzvorrichtung
AT509877B1 (de) * 2010-11-02 2011-12-15 Bosch Gmbh Robert Vorrichtung zum einspritzen von kraftstoff in den brennraum einer brennkraftmaschine
AT512437B1 (de) 2012-01-26 2014-03-15 Bosch Gmbh Robert Vorrichtung zum einspritzen von kraftstoff in den brennraum einer brennkraftmaschine
AT512439B1 (de) * 2012-01-26 2013-12-15 Bosch Gmbh Robert Vorrichtung zum einspritzen von kraftstoff in den brennraum einer brennkraftmaschine
DE102012204659A1 (de) * 2012-03-22 2013-09-26 Man Diesel & Turbo Se Injektor für eine Kraftstoffversorgungsanlage einer Brennkraftmaschine sowie Kraftstoffversorgungsanlage
AT512960B1 (de) * 2012-05-22 2014-03-15 Bosch Gmbh Robert Injektor eines modularen Common-Rail-Kraftstoffeinspritzsystems
GB2504315A (en) * 2012-07-25 2014-01-29 Gm Global Tech Operations Inc I.c. engine common rail system with each fuel injector connected to the rail by two fuel delivery channels to reduce transient pressure wave propagation
US9644590B2 (en) 2014-01-31 2017-05-09 Cummins Inc. Fuel injection pressure pulsation dampening system

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GB925937A (en) * 1959-06-05 1963-05-15 Tatra Np Improvements in and relating to fuel injection arrangements for compression-ignitionengines
DE2749589A1 (de) * 1977-11-05 1979-05-10 Schwarze Rigobert Kaltbiege- verfahren und -vorrichtung zur herstellung von gekruemmten mantelrohrleitungen
DE3739937A1 (de) * 1987-11-25 1989-06-08 Man B & W Diesel Gmbh Kraftstoffdruckleitung
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FR2818732B1 (fr) * 2000-12-22 2004-05-28 Renault Procede d'amortissement des ondes de pression dans une ligne hydraulique, et dispositif d'injection a rampe commune mettant en oeuvre ce procede
JP2002235522A (ja) * 2001-02-09 2002-08-23 Komatsu Ltd 排気消音装置
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JP3991756B2 (ja) * 2002-04-17 2007-10-17 トヨタ自動車株式会社 燃料噴射装置
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022148679A1 (de) 2021-01-11 2022-07-14 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung
DE102021200154A1 (de) 2021-01-11 2022-07-14 Robert Bosch Gesellschaft mit beschränkter Haftung Kraftstoffeinspritzvorrichtung

Also Published As

Publication number Publication date
ATE462884T1 (de) 2010-04-15
EP2027385A1 (de) 2009-02-25
WO2007143768A1 (de) 2007-12-21
JP2009540196A (ja) 2009-11-19
US7866300B2 (en) 2011-01-11
AT503660A4 (de) 2007-12-15
AT503660B1 (de) 2007-12-15
US20100263626A1 (en) 2010-10-21
JP4884529B2 (ja) 2012-02-29
DE502007003315D1 (de) 2010-05-12

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