EP1724462A2 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP1724462A2
EP1724462A2 EP06110841A EP06110841A EP1724462A2 EP 1724462 A2 EP1724462 A2 EP 1724462A2 EP 06110841 A EP06110841 A EP 06110841A EP 06110841 A EP06110841 A EP 06110841A EP 1724462 A2 EP1724462 A2 EP 1724462A2
Authority
EP
European Patent Office
Prior art keywords
needle
valve
nozzle
valve position
fuel injection
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Withdrawn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
EP06110841A
Other languages
German (de)
English (en)
Other versions
EP1724462A3 (fr
Inventor
Rudolf Heinz
Stefan Schuerg
Wolfgang Stoecklein
Holger Rapp
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 EP1724462A2 publication Critical patent/EP1724462A2/fr
Publication of EP1724462A3 publication Critical patent/EP1724462A3/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Withdrawn legal-status Critical Current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
    • 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
    • F02M63/0045—Three-way valves
    • 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
    • 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
    • F02M2200/46—Valves, e.g. injectors, with concentric valve bodies

Definitions

  • the invention is based on a fuel injection nozzle according to the preamble of patent claim 1.
  • Such a fuel injection nozzle for internal combustion engines is, for example, by the DE 102 05 970 A1 known.
  • the fuel injector for internal combustion engines according to the invention with the characterizing features of claim 1 has the advantage that the opening of the second needle is triggered by the fact that the first needle reaches its stroke stop, and the time between the opening of the first needle and its arrival at the stroke stop varies can be, without this, the switching valve must be operated multiple times.
  • the opening speed of the first needle can be varied by changing between the second valve position of the switching valve and the third valve position between a slow value and a fast value. This allows the time between opening the first needle and reaching its stroke stop between a minimum time interval and be varied continuously with a maximum time interval.
  • the switching valve must be moved as quickly as possible into its third valve position after a short switch to the second valve position. If the maximum time interval is to be achieved (eg for an injection in the upper part-load range with the second needle closed), then the switching valve is operated in the second valve position during the entire activation period. If an arbitrary time interval between the two extreme values is to be achieved (eg for a full-load injection with extended boot phase), then the switching valve is initially operated in the second valve position and the first needle opens at the slow speed. After a variable time, the switching valve is then brought from the second valve position to its third valve position, in which then opens the second needle. About the switching time between the second and third valve position of the switching valve, the time of flight of the first needle can be adjusted until it reaches its stroke stop.
  • the fuel injection nozzle (injector) 1 for internal combustion engines shown in FIG. 1 has a cylindrical nozzle body 2 which projects with its free lower end into a combustion chamber of the internal combustion engine, which is not shown in more detail.
  • a guide bore 3 of the nozzle body 2 designed as a hollow needle outer nozzle needle 4 is axially displaceably guided, in which an inner nozzle needle 5 is arranged coaxially and also guided axially displaceable.
  • an annular space 6 is formed, which is bounded by the outer nozzle needle 4 radially inwardly.
  • a fuel high-pressure line 7 of the annular chamber 6 is connected to an unillustrated fuel high-pressure accumulator (common rail).
  • a first closing spring presses the outer nozzle needle 4 into a first, outer sealing seat at the combustion chamber end of the guide bore 3.
  • the outer nozzle needle 4 is surrounded at the combustion chamber end by an annular gap 8 , which goes away from the annular space 6 and extends to the outer Sealing seat extends.
  • a sealing cone 9 of the outer nozzle needle 4 in conjunction with the outer sealing seat prevents fuel from passing through the annular gap 8 from the annular space 6 through the first, outer injection holes 10 into the combustion chamber of the internal combustion engine ,
  • a second closing spring presses the inner nozzle needle 5 into a second, inner sealing seat at the combustion chamber end of the guide bore 3.
  • an annular gap 11 is provided, which is also connected via a wall opening 12 in the outer nozzle needle 4 with the annular space 6 and extends to the inner sealing seat.
  • a sealing cone 12 of the inner nozzle needle 5 in conjunction with the inner sealing seat prevents fuel from passing through the annular gap 11 from the annular space 6 through second internal injection holes 13 into the combustion chamber of the internal combustion engine ,
  • the two sealing seats are formed by a common conical surface 14 .
  • the two nozzle needles 4, 5 in a common control chamber 15 each have a control surface 16, 17 acting in the closing direction.
  • the control chamber 15 is connected via an inlet throttle 18 to the high-pressure line 7.
  • From the control room 15 go two parallel flow restrictors 19, 20 from.
  • the outlet throttles 19, 20 are connected to a drain 21 via a 3/3-way switching valve 22 formed valve assembly which blocks the connection of the two flow restrictors 19, 20 to the outlet 21 in a first or left valve position, in a second or .
  • Right valve position connects only the first outlet throttle 19 with the outlet 21 and connects in a middle third valve position both outlet throttles 19, 20 with the outlet 21.
  • the outer nozzle needle 4 opens when the control pressure p St is smaller than a first pressure value p 1 (p 1 ⁇ p CR ), and the inner nozzle needle 5 opens when the control pressure p ST smaller than a second pressure value p 2 (p 2 ⁇ p CR ; p 2 # p 1 ).
  • p 2 > p 1 and, consequently, when the pressure in the control chamber 15 is reduced, first the inner nozzle needle 5 opens.
  • the opening stroke of the two nozzle needles 4, 5 is limited in each case by a housing-side stroke stop 23 .
  • the fuel injection is started by switching the 3/3-way switching valve 22 to the right valve position, in which the control chamber 15 is connected to the drain 21 via the first outlet throttle 19.
  • the control pressure p St prevailing in the control chamber 15 drops below the second pressure value p 2
  • the inner nozzle needle 5 opens until it bears against the stroke stop 23 (FIG. 2).
  • the inlet throttle 18 and the first outlet throttle 19 are designed so that in the right valve position the control pressure p St does not fall below the first pressure value p 1 and consequently the outer nozzle needle 4 does not open.
  • the switching valve 22 is further switched to the middle valve position, the control chamber 15 is now also connected via the second outlet throttle 20 to the outlet 21.
  • the outer nozzle needle 4 also opens until it bears against the stroke stop 23 (FIG. 3).
  • the switching valve 22 must be returned to the left valve position. If this happens from the middle valve position, it is advantageous not to switch directly to the left valve position, but first to go very briefly to the right valve position and then immediately switch to the left valve position. In the right valve position, namely, the hydraulic restoring forces acting on the valve element of the switching valve 22, much higher than in the middle valve position, so that from the right valve position out a much faster and more accurate closing of the switching valve 22 can accomplish than from the middle Valve position out.
  • the system can also be designed so that the outer nozzle needle 4 opens only when the inner nozzle needle 5 is at its stroke stop 23 and the switching valve 22 is operated in its middle valve position.
  • the inlet throttle 18 and the first outlet throttle 19 are designed so that the control pressure p St in the right valve position can also fall below the first pressure value p 1 , the outer valve needle 4 also opens in the right valve position (FIG. Fig. 4 ), as soon as the inner nozzle needle 5 has reached its stroke stop 23. As long as the inner nozzle needle 5 is in its upward movement, namely, the control chamber pressure remains greater than p 2 .
  • the position of the inlet of the inlet throttle 18 in the control chamber can also be selected so that the inlet throttle 18 is covered by the inner nozzle needle 5 when it reaches its stroke stop 23.
  • the effect of the pressure reduction in the control chamber 15 upon arrival of the inner nozzle needle 5 at its stroke stop 23 is enhanced in this way.

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)
EP06110841A 2005-05-04 2006-03-08 Injecteur de carburant Withdrawn EP1724462A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510020832 DE102005020832A1 (de) 2005-05-04 2005-05-04 Kraftstoffeinspritzdüse

Publications (2)

Publication Number Publication Date
EP1724462A2 true EP1724462A2 (fr) 2006-11-22
EP1724462A3 EP1724462A3 (fr) 2007-03-21

Family

ID=36752444

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06110841A Withdrawn EP1724462A3 (fr) 2005-05-04 2006-03-08 Injecteur de carburant

Country Status (2)

Country Link
EP (1) EP1724462A3 (fr)
DE (1) DE102005020832A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1939440A2 (fr) * 2006-12-29 2008-07-02 Robert Bosch Gmbh Soupape d'injection de combustible

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017116244A1 (de) * 2017-07-19 2019-01-24 Volkswagen Aktiengesellschaft Verbrennungsmotor und Verfahren zum Betreiben eines Verbrennungsmotors

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10205970A1 (de) * 2002-02-14 2003-09-04 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10335211A1 (de) * 2003-08-01 2005-02-17 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine
WO2005019638A1 (fr) * 2003-08-20 2005-03-03 Robert Bosch Gmbh Soupape d'injection de carburant pour des moteurs a combustion interne
EP1591655A1 (fr) * 2004-04-27 2005-11-02 Robert Bosch Gmbh Buse d'injection
DE102005010453A1 (de) * 2005-03-08 2006-09-14 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10205970A1 (de) * 2002-02-14 2003-09-04 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE10335211A1 (de) * 2003-08-01 2005-02-17 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine
WO2005019638A1 (fr) * 2003-08-20 2005-03-03 Robert Bosch Gmbh Soupape d'injection de carburant pour des moteurs a combustion interne
EP1591655A1 (fr) * 2004-04-27 2005-11-02 Robert Bosch Gmbh Buse d'injection
DE102005010453A1 (de) * 2005-03-08 2006-09-14 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1939440A2 (fr) * 2006-12-29 2008-07-02 Robert Bosch Gmbh Soupape d'injection de combustible
EP1939440A3 (fr) * 2006-12-29 2009-09-09 Robert Bosch Gmbh Soupape d'injection de combustible

Also Published As

Publication number Publication date
EP1724462A3 (fr) 2007-03-21
DE102005020832A1 (de) 2006-11-09

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