EP2138709A1 - Injecteur de carburant actionné directement - Google Patents

Injecteur de carburant actionné directement Download PDF

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Publication number
EP2138709A1
EP2138709A1 EP09100250A EP09100250A EP2138709A1 EP 2138709 A1 EP2138709 A1 EP 2138709A1 EP 09100250 A EP09100250 A EP 09100250A EP 09100250 A EP09100250 A EP 09100250A EP 2138709 A1 EP2138709 A1 EP 2138709A1
Authority
EP
European Patent Office
Prior art keywords
valve
pressure
fuel injector
fuel
sleeve
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
EP09100250A
Other languages
German (de)
English (en)
Other versions
EP2138709B1 (fr
Inventor
Olaf Ohlhafer
Robert Giezendanner-Thoben
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 EP2138709A1 publication Critical patent/EP2138709A1/fr
Application granted granted Critical
Publication of EP2138709B1 publication Critical patent/EP2138709B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift

Definitions

  • DE 10 2006 050 810 refers to a fuel injector for internal combustion engines with a control room connected to a high-pressure side. About the pressure and the change in pressure, the movement of a nozzle needle is controlled.
  • a control valve locks or opens the connection of the control chamber to a low pressure side.
  • the control valve comprises a fixed valve pin which has an inner relief channel coming from the control chamber and opening into an annular groove of the valve pin. Further, a displaceably guided on the free end of the valve pin, force balanced control sleeve is provided which closes the annular groove in its closed valve position to the outside and opens in their direction towards the free end of the valve pin open valve position, the compound of the annular groove to the low pressure side.
  • Fuel injectors of this type therefore inherently have a necessary for the realization of the needle stroke control flow and, where appropriate, a leakage volume flow, which leads to an increased required delivery capacity of the high-pressure pump.
  • a delayed response of the injection valve member which can also be influenced by unintentionally occurring pressure fluctuations.
  • a direct actuation of the usually needle-shaped injection valve member with an electromagnetic actuator has not been possible because the required force due to the non-pressure balanced formed injection valve member at system pressures of over 2000 bar resulted in too large a magnetic actuator.
  • a concept of a fuel injector is proposed, with which the force required to open a needle-shaped injection valve member is lowered so far that the injection valve member can be lifted directly and directly via a magnetic actuator.
  • the proposed injector concept is characterized by low applied forces for opening the injection valve member, so that a direct actuation of the same by means of an electromagnet is possible.
  • the proposed solution according to the invention realizes a tax-free principle. There is no return of a controlled from a control room volume of fuel required, which on the one hand represents a reduced system overhead and on the other hand leads to smaller pump delivery in terms of high-pressure pumping unit through which the high-pressure accumulator chamber (common rail) is acted upon.
  • the proposed solution according to the invention represents a very cost-effective solution, since a simple construction can be achieved.
  • a control valve with associated inlet and outlet throttles can be omitted, as well as a push rod with respect to the injection valve member and any required leakage lines.
  • the proposed solution according to the invention realizes a concept which requires little installation space.
  • the magnetic armature cooperating with a magnetic actuator is designed as a valve sleeve.
  • a spring presses the valve sleeve into the sealing seat, which is formed, for example, on a valve piece embedded in the injector body.
  • the spring force is preset when mounting a shim, for example.
  • the valve piece is pressed via the shim into the sealing seat, so that no leakage can occur on the sealing seat. Any leakage that may occur is led out through the guide of the valve sleeve via a return line. It is important to avoid leaking into the high pressure area.
  • the leakage described here occurs between the guide the valve body and the valve sleeve in the return.
  • the return flow flows due to the pressure conditions through a laterally mounted hole upwards in the direction of a return.
  • the valve sleeve at the top of which the anchor plate is formed, is external, top and bottom of the system pressure, i. surrounded by the pressure prevailing in the high-pressure accumulator body. It is therefore pressure-balanced with respect to its axial movement and thus balanced with respect to the pressure prevailing in the high pressure reservoir body (common rail) system pressure.
  • To open the valve sleeve only the spring force must be overcome by means of a magnetic actuator.
  • the force required for opening is independent of the pressure prevailing in the high-pressure accumulator body system pressure (which is also referred to as rail pressure) and thus over the entire pressure range that occurs in the high-pressure accumulator body, constant.
  • valve sleeve which also represents the armature, pulled by the magnetic actuator upwards.
  • fuel now flows from the outside to the at least one injection port at the combustion chamber end of the fuel injector.
  • the injection openings may be embodied, for example, at the combustion chamber end in the wall of the fuel injector.
  • the energization of the magnetic actuator is interrupted.
  • the valve sleeve is urged back down into its sealing seat on the valve member by the spring force acting on it so that supply of system pressurized fuel to the at least one injection port formed at the combustion chamber end of the fuel injector is discontinued.
  • FIG. 1 is a longitudinal section through the inventively proposed fuel injector with directly actuated valve sleeve refer.
  • a fuel injector 10 as shown in FIG. 1 comprises an injector body 12, which in the illustration according to FIG. 1 is guided symmetrically to a Injektorachse 14.
  • a high pressure supply line 16 is under system pressure pending fuel.
  • the pressure level is designated, which within a in the illustration according to FIG. 1 unplayed high-pressure accumulator body (common rail) prevails. This pressure level is in the illustration according to FIG. 1 indicated by p Rail .
  • the fuel which is present at the high-pressure port 16 of the injector body 12, flows into the interior of the injector body 12 and supplies it with fuel.
  • valve piece 20 Inside the injector body 12 is a valve piece 20 which is fixed to the combustion chamber end of the injector body 12 of the fuel injector 10.
  • the valve piece 20 comprises a leakage bore 22 extending coaxially with the injector axis 14.
  • the leakage bore 22 has no direct connection to the supply line 26 or 28.
  • the fuel flows during the injection through the inlet bore 28 or the transverse bore 26.
  • the leakage bore 22 is intended to remove leakage from the blind hole, which flows through the lower guide of the valve piece with the sleeve, and the leakage from the high-pressure region passes through the guide above the transverse bore 26 into the return line (FIG.
  • valve piece 20 is installed with the aid of a dial 40 in the injector 12 and forms at the combustion chamber end a seal 32, below which extends a blind hole configured cavity. From this extend, as shown in the illustration FIG. 1 reproduced, at least two injection openings 30, via which fuel in the in FIG. 1 not shown combustion chamber of an internal combustion engine can be injected.
  • a further dial 46 is added below the dial 40.
  • This further shim 46 serves to adjust the spring force of a closing spring 44.
  • This closing spring 44 surrounds a magnetic actuator 38.
  • the magnetic actuator 38 is received in the interior of the injector body 12 and surrounded by the fuel under system pressure p rail .
  • the solenoid actuator 38 further encloses the valve member 20 which extends coaxially with the injector axis 14 through the injector body 12 of the fuel injector 10.
  • the magnetic actuator 38 acts on an armature plate 36, which is formed on the upper plan side of the axially movable in the injector body 12 valve sleeve 42.
  • the valve sleeve 42 is also enclosed on the inside of the injector body 12 by the system pressure fuel on all sides, i. pressure-balanced.
  • the adjusting washer 40, the further adjusting washer 46 for adjusting the force acting on the closing spring 44 are supported by an adjusting sleeve 48 which is arranged in the interior of the injector body 12, the valve sleeve 42 enclosing.
  • valve sleeve 42 which surrounds the valve member 20 forms at the lower end a sealing seat 24, which is formed for example as a conical seat. From the illustration according to FIG. 1 shows that even at the sealing seat 24, the in FIG. 1 is shown closed, standing under high pressure fuel from the outside.
  • the blind hole 34 is acted upon only via the concentric, ie coaxially to the injector 14 extending inlet bore 28 under system pressure p rail standing fuel.
  • the solenoid actuator 38 applies only the force required to actuate the pressure balanced valve sleeve 42.
  • the magnet armature 38 When the magnet armature 38 is energized, it pulls the armature plate 36 of the valve sleeve 42 against the force of the closing spring 44. Accordingly, the magnetic actuator 38 has only the closing force, ie the spring force which applies the closing spring 44, to overcome and can be designed accordingly.
  • the inventively proposed, directly operated fuel injector 10 is also constructed much simpler compared to previously known from the prior art fuel injectors whose operation is done indirectly via the pressure relief or pressurization of a control room.
  • the inventively proposed fuel injector 10 realizes a tax-free fuel injector, in which no return of a controlled from a control room volume in the direction of the low pressure region is required. This requires a reduced compared to previous solutions system overhead and a smaller dimensioning capacity of a delivery unit.
  • drain and inlet throttle can be omitted, as well as the control chamber and the push rod, which was previously used in generally needle-shaped injection valve members.
  • the inventively proposed fuel injector 10 is characterized by a shorter overall length compared to known from the prior art fuel injectors.
  • the representation according to FIG. 2 is to refer to the connection of the leakage hole 22 in an enlarged scale.
  • FIG. 2 puts the in FIG. 1 Circled area on an enlarged scale.
  • the return flow flows due to suitable pressure conditions and possibly to generate a negative pressure in the leakage bore 22 by the in FIG. 2 illustrated transverse holes upwards in the direction of the return.
  • the return flow occurs as soon as a leakage pressure p leakage as a function of the system pressure p rail plus a combustion chamber pressure p cylinder is greater than the pressure prevailing in the return pressure level p RL .
  • valve sleeve 42 is surrounded outside on its lateral surface at the top and at the bottom of system pressure p rail . This means that the valve sleeve 42 is pressure-balanced with respect to its axial movement and is force-balanced with respect to the system pressure p Rail .
  • the spring force which is applied by the closing spring 44, must be overcome by means of the magnet armature 38.
  • the required magnetic force is independent of the system pressure p rail and thus constant over the entire pressure range of the system pressure p rail .
  • this or its armature plate 36 is attracted by the magnetic actuator 38 upwards.
  • the fuel which is present at the valve seat 42 under system pressure p rail flows via the open valve seat 24 in the direction of the blind hole 34 and from there to the injection openings 30.
  • the energization of the magnetic actuator 38 is interrupted and the force-balanced valve sleeve 42 is pressed by the action of the spring force of the closing spring 44 back down into the valve seat 24.
  • the pressurization of the blind hole-like cavity 34 is interrupted at the combustion chamber end of the injector body 12 of the fuel injector 10 and the injection is completed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
EP09100250A 2008-06-24 2009-04-24 Injecteur de carburant actionné directement Not-in-force EP2138709B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008002605A DE102008002605A1 (de) 2008-06-24 2008-06-24 Direkt betätigter Kraftstoffinjektor

Publications (2)

Publication Number Publication Date
EP2138709A1 true EP2138709A1 (fr) 2009-12-30
EP2138709B1 EP2138709B1 (fr) 2011-10-26

Family

ID=41202348

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09100250A Not-in-force EP2138709B1 (fr) 2008-06-24 2009-04-24 Injecteur de carburant actionné directement

Country Status (3)

Country Link
EP (1) EP2138709B1 (fr)
AT (1) ATE530760T1 (fr)
DE (1) DE102008002605A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2395227A3 (fr) * 2010-06-14 2015-04-22 Robert Bosch GmbH Ventilateur d'injection
SE1951116A1 (en) * 2019-10-01 2021-04-02 Scania Cv Ab Fuel injector arrangement, high pressure injection system comprising the injector arrangement, fuel system comprising the high pressure injection system, vehicle comprising the fuel system, and a meth

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5645226A (en) * 1995-02-13 1997-07-08 Siemens Automotive Corporation Solenoid motion initiator
DE19754112A1 (de) * 1996-12-06 1998-06-10 Hyundai Motor Co Ltd Kraftstoffinjektor eines Dieselmotors
DE10111293A1 (de) * 2001-03-09 2002-09-19 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
DE102006050810A1 (de) 2006-10-27 2008-04-30 Robert Bosch Gmbh Kraftstoffinjektor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5645226A (en) * 1995-02-13 1997-07-08 Siemens Automotive Corporation Solenoid motion initiator
DE19754112A1 (de) * 1996-12-06 1998-06-10 Hyundai Motor Co Ltd Kraftstoffinjektor eines Dieselmotors
DE10111293A1 (de) * 2001-03-09 2002-09-19 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
DE102006050810A1 (de) 2006-10-27 2008-04-30 Robert Bosch Gmbh Kraftstoffinjektor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2395227A3 (fr) * 2010-06-14 2015-04-22 Robert Bosch GmbH Ventilateur d'injection
SE1951116A1 (en) * 2019-10-01 2021-04-02 Scania Cv Ab Fuel injector arrangement, high pressure injection system comprising the injector arrangement, fuel system comprising the high pressure injection system, vehicle comprising the fuel system, and a meth
SE545024C2 (en) * 2019-10-01 2023-02-28 Scania Cv Ab Fuel injector arrangement for an internal combustion engine and method for operating said arrangement

Also Published As

Publication number Publication date
DE102008002605A1 (de) 2009-12-31
ATE530760T1 (de) 2011-11-15
EP2138709B1 (fr) 2011-10-26

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