EP1944500A2 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP1944500A2
EP1944500A2 EP07122578A EP07122578A EP1944500A2 EP 1944500 A2 EP1944500 A2 EP 1944500A2 EP 07122578 A EP07122578 A EP 07122578A EP 07122578 A EP07122578 A EP 07122578A EP 1944500 A2 EP1944500 A2 EP 1944500A2
Authority
EP
European Patent Office
Prior art keywords
valve
control piston
fuel injector
control
pressure side
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Withdrawn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
EP07122578A
Other languages
German (de)
English (en)
Other versions
EP1944500A3 (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 EP1944500A2 publication Critical patent/EP1944500A2/fr
Publication of EP1944500A3 publication Critical patent/EP1944500A3/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Withdrawn legal-status Critical Current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
    • 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
    • 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
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F02M63/008—Hollow valve members, e.g. members internally guided
    • 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
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • the invention relates to a fuel injector according to the preamble of patent claim 1.
  • the in Fig. 1 shown fuel injector 1 is commonly used in an internal combustion engine having a plurality of cylinders, wherein each of these cylinders associated with such an injector (fuel injection valve).
  • the injector has in a conventional manner a projecting into a cylinder combustion chamber of the internal combustion engine, not shown here injector and the injector depending on the pressure in a control chamber 2 opening and closing, here indicated only to a small extent nozzle needle 3.
  • the control chamber 2 is connected via an inlet throttle (Z-throttle) 4 permanently to a high-pressure inlet line (high pressure side) 5 of the fuel.
  • a control valve 6 in the form of a 2/2-way valve is provided, which opens or blocks the connection of the control chamber 2 with a low-pressure chamber (low-pressure side) 7 .
  • the high-pressure supply line 5 is connected to a not shown high-pressure accumulator (common rail) and the low pressure chamber 7 is connected to a leakage oil drain 7a.
  • the nozzle needle 3 is guided to form the control chamber 2 in a valve piece 8 , in which the Z-throttle 4 is provided.
  • the control valve 6 has a guide piece 9 with an upwardly open bore 9a and a slidably guided therein between two valve positions control piston 10 , whose in Fig. 1 upper end of the piston projects into the low-pressure space 7.
  • the valve and guide pieces 8, 9 are braced in a bore of an injector body 11 by means of a valve clamping screw 12 .
  • In the valve and guide pieces 8, 9 extending from the control chamber 2 connecting channel 13 which opens via an annular groove 14 in the bore 9a of the guide piece 9 and an outlet throttle (A-throttle) 15 has.
  • A-throttle In the bore 9a of the guide piece 9, a conical valve seat 16 connects at the bottom of the annular groove 14.
  • the control piston 10 has at its lower end a conical sealing surface which cooperates with the conical valve seat 16.
  • the seat opening of the valve seat 16 is connected to the low-pressure chamber 7 above the control piston 10.
  • the control piston 10 is biased by a housing-side supported closing spring 18 in its closed valve position and by means of a magnetic coil 19 whose magnetic field on a disc-shaped armature 20 of the control piston 10 acts, displaceable in its open valve position.
  • the armature 20 is provided at the upper end of the control piston 10.
  • the magnetic coil 19 with its magnetic core 21 is arranged in the interior of a magnetic sleeve 22 , which is fastened by means of a magnetic clamping nut 23 on the injector 11.
  • the diameter d of the valve seat 16 is equal to the guide diameter D of the guide piece 9, whereby the control piston 10 in its in Fig. 1 shown closed valve position with respect to the pressure prevailing in the annular groove 14 high pressure. In this closed valve position, the connection of the control chamber 2 to the low pressure side 7 is blocked by the control piston 10 and therefore the nozzle needle 3 is closed by the pressure prevailing in the control chamber 2 high pressure. If the solenoid 19 is energized, the control piston 10 is pulled from the valve seat 16 in the direction away from the nozzle needle 3 in its open valve position, whereby the pressure in the control chamber 2 is reduced and the nozzle needle 3 opens.
  • the pressure surge occurring during opening of the control piston 10 is not dissipated via the armature 20, but via the longitudinal bore 17, whereby the control piston 10 is not excited to vibrate. Since the control piston 10 is force-balanced, only small forces are required to open the control piston 10. The control piston 10 makes only a very small opening stroke of about 18-25 microns. When the control piston 10 is open, the A-throttle 15 limits the flow. If the energization of the solenoid 19 is released, the control piston 10 is moved back into its closed valve position via the closing spring 18 and the control chamber 2 is filled again via the Z-throttle 4. The force-balanced control piston 10 and the leakage guide through the control piston 10 allow an almost vibration-free, highly dynamic control valve. 6
  • valve seat 16 is not provided within the bore 9a of the valve member 9, but at the top of the protruding into the low-pressure chamber 7 upper end of the valve member 9 and formed as a flat seat.
  • the control piston 10 has a down here on the armature 20 provided flat sealing surface which cooperates with the valve seat 16.
  • the valve 2 is force-balanced, because the seat diameter d is equal to the guide diameter D.
  • the Fig. 1 in which the annular groove 14 is formed in the guide piece 9 is in Fig. 2 provided the annular groove 14 in the control piston 10.
  • the bore 9a of the guide piece 9 is connected below the control piston 10 with the low-pressure chamber 7.
  • the advantage of this embodiment is the compact valve design, which allows very small valve strokes on the flat seat with extremely steep flow behavior. Therefore, the dynamics of the control valve 6 can be increased considerably.
  • the hydraulic booster 30 comprises two interengaging pistons 33, 34 which are reciprocally coupled in motion by a fluid-filled booster chamber 32 .
  • the piezoactuator 31 acts on the outer piston 33, and the inner piston 34 is formed integrally with the control piston 10. In the closed valve position shown, the piezoelectric actuator 31 is not energized and thus shortened, whereby the outer piston 33 is displaced upwards and thus the inner piston 34 and the control piston 10 are displaced downwards into the closed valve position.
  • the piezoelectric actuator 31 If the piezoelectric actuator 31 is energized, it extends against the action of a tubular spring 35, whereby the outer piston 33 is pushed down and thus the inner piston 34 and the control piston 10 are moved upwards into the open valve position. If the piezoelectric actuator 31 is no longer energized, the control piston 10 is moved back to its closed valve position via the closing spring 18 supported on the outer piston 34 and the control chamber 2 is filled again via the Z-throttle 4. Since hardly force is demanded from the piezoelectric actuator 31, it can be made very small in diameter. Through holes 36 in the outer piston 33 flows out of the control chamber 2 when the control piston 10 is open Fuel quantity on the other side of the piston and the drain 7a.
  • the path of the amount of fuel removed from the valve seat 16 to the drain 7a is indicated by flow arrow 37 .
  • a membrane 38 of the piezoelectric actuator 31 is sealed against the low-pressure space.
  • the hole 9a of the guide piece 9 is not formed as a blind hole, but as a through hole, which is closed by the valve piece 8.
  • the compact control valve 6 thus controls hydraulically translated and force reversal the force balanced control piston 10, whereby the piezoelectric actuator 31 can be constructed very narrow.

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)
EP07122578A 2007-01-10 2007-12-07 Injecteur de carburant Withdrawn EP1944500A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710001554 DE102007001554A1 (de) 2007-01-10 2007-01-10 Kraftstoffinjektor

Publications (2)

Publication Number Publication Date
EP1944500A2 true EP1944500A2 (fr) 2008-07-16
EP1944500A3 EP1944500A3 (fr) 2009-08-05

Family

ID=39232738

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07122578A Withdrawn EP1944500A3 (fr) 2007-01-10 2007-12-07 Injecteur de carburant

Country Status (2)

Country Link
EP (1) EP1944500A3 (fr)
DE (1) DE102007001554A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009047091A1 (fr) * 2007-10-02 2009-04-16 Robert Bosch Gmbh Injecteur avec élément soupape de commande en forme de douille
DE102009039647A1 (de) * 2009-09-01 2011-03-24 Continental Automotive Gmbh Kraftstoffinjektor und Kraftstoff-Einspritzsystem
US20120216772A1 (en) * 2009-11-10 2012-08-30 Robert Bosch Gmbh Fuel injector
EP2400144A3 (fr) * 2010-06-23 2014-07-30 Robert Bosch GmbH Injecteur de carburant
EP2924273A1 (fr) * 2014-03-25 2015-09-30 Robert Bosch Gmbh Vanne de commande pour un injecteur de carburant et injecteur de carburant
FR3032240A1 (fr) * 2015-02-02 2016-08-05 Delphi Int Operations Luxembourg Sarl Vanne de commande pour injecteur de carburant
CN108361134A (zh) * 2018-01-29 2018-08-03 中国第汽车股份有限公司 燃料喷射装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007058766A1 (de) 2007-12-06 2009-06-10 Robert Bosch Gmbh Steuerventil für einen Kraftstoffinjektor
DE102012209330A1 (de) 2012-06-01 2013-12-05 Robert Bosch Gmbh Kraftstoffinjektor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP1600627A1 (fr) * 2004-05-15 2005-11-30 L'orange Gmbh Soupape de régulation
EP1612398A1 (fr) * 2004-06-30 2006-01-04 C.R.F. Società Consortile per Azioni Injecteur de carburant a soupape de commande a equilibrage des forces
EP1657435A1 (fr) * 2004-11-12 2006-05-17 C.R.F. Società Consortile per Azioni Injecteur de combustible pour moteur à combustion interne

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP1600627A1 (fr) * 2004-05-15 2005-11-30 L'orange Gmbh Soupape de régulation
EP1612398A1 (fr) * 2004-06-30 2006-01-04 C.R.F. Società Consortile per Azioni Injecteur de carburant a soupape de commande a equilibrage des forces
EP1657435A1 (fr) * 2004-11-12 2006-05-17 C.R.F. Società Consortile per Azioni Injecteur de combustible pour moteur à combustion interne

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009047091A1 (fr) * 2007-10-02 2009-04-16 Robert Bosch Gmbh Injecteur avec élément soupape de commande en forme de douille
DE102009039647A1 (de) * 2009-09-01 2011-03-24 Continental Automotive Gmbh Kraftstoffinjektor und Kraftstoff-Einspritzsystem
US20120216772A1 (en) * 2009-11-10 2012-08-30 Robert Bosch Gmbh Fuel injector
EP2400144A3 (fr) * 2010-06-23 2014-07-30 Robert Bosch GmbH Injecteur de carburant
EP2924273A1 (fr) * 2014-03-25 2015-09-30 Robert Bosch Gmbh Vanne de commande pour un injecteur de carburant et injecteur de carburant
FR3032240A1 (fr) * 2015-02-02 2016-08-05 Delphi Int Operations Luxembourg Sarl Vanne de commande pour injecteur de carburant
WO2016124496A1 (fr) * 2015-02-02 2016-08-11 Delphi International Operations Luxembourg S.À R.L. Vanne de commande pour injecteur de carburant
CN108361134A (zh) * 2018-01-29 2018-08-03 中国第汽车股份有限公司 燃料喷射装置

Also Published As

Publication number Publication date
EP1944500A3 (fr) 2009-08-05
DE102007001554A1 (de) 2008-07-17

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