EP1967727A2 - Injecteur de carburant doté d'un équipement amélioré d'une soupape de commande pour la commande d'une aiguille d'injection - Google Patents

Injecteur de carburant doté d'un équipement amélioré d'une soupape de commande pour la commande d'une aiguille d'injection Download PDF

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Publication number
EP1967727A2
EP1967727A2 EP08100932A EP08100932A EP1967727A2 EP 1967727 A2 EP1967727 A2 EP 1967727A2 EP 08100932 A EP08100932 A EP 08100932A EP 08100932 A EP08100932 A EP 08100932A EP 1967727 A2 EP1967727 A2 EP 1967727A2
Authority
EP
European Patent Office
Prior art keywords
throttle
fuel
fuel injector
needle
valve needle
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
EP08100932A
Other languages
German (de)
English (en)
Other versions
EP1967727B1 (fr
EP1967727A3 (fr
Inventor
Hans-Christoph Magel
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 EP1967727A2 publication Critical patent/EP1967727A2/fr
Publication of EP1967727A3 publication Critical patent/EP1967727A3/fr
Application granted granted Critical
Publication of EP1967727B1 publication Critical patent/EP1967727B1/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
    • 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
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/304—Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic means

Definitions

  • the present invention relates to a fuel injector for injecting fuel into a combustion chamber of a brake engine according to the closer defined in the preamble of claim 1.
  • fuel injectors which have a control valve, which is actuated for example by an electromagnet.
  • the control valve By means of the control valve, the lifting movement of a nozzle needle is controlled, which is received within the injector housing or within the nozzle body of the fuel injector.
  • the nozzle needle closes injection openings introduced in the nozzle body, so that the injection openings are released over a defined time range by a lifting movement of the nozzle needle, so that the fuel supplied under high pressure can pass from the injection openings into the combustion chamber of the internal combustion engine.
  • Such fuel injectors are used in stroke-controlled common rail systems. The advantage here is that the injection pressure to the load and the speed of the engine can be adjusted.
  • Hub-controlled common rail injectors are known with a solenoid valve, which is formed from the electromagnet and the control valve.
  • the nozzle needle is therefore controlled via a control chamber in the lifting movement, so that when venting the control chamber, the nozzle needle can lift off from the seat of the injection openings to release them.
  • the pressure in the control chamber is controlled by the control valve, wherein known active valve elements are formed for example of ball elements or cylinder elements, which are brought into a sealing seat for conditioning.
  • the control valves comprise a valve needle, which is not pressure balanced and therefore must be operated with high forces.
  • the solenoid of the solenoid valve comprises a compression spring which must press the nozzle needle into the sealing seat.
  • valve needles of the control valves are known, which allow smaller spring forces, so that even smaller switching forces of the electromagnets are sufficient. This also smaller valve lifts and thus faster switching times are feasible.
  • the multiple injection capability can also be improved.
  • needle bumpers occur which impair the switching performance even with a pressure balanced valve.
  • the pressure-balanced arrangement of the valve needle is effected by an indifferent pressurization by the high-pressure fuel, so that the valve needle has at least no fuel-pressurized surfaces, which cause a fluidic force in the direction of the lifting movement. To damp the movement of the valve needle are used in this located in the low pressure circuit anchor surfaces.
  • strong influences of the fuel temperature, the air content and the return pressure occur, which cause large tolerance problems.
  • the valve pin is guided in accordance with the underlying state of the art on a pressure pin which extends through the valve needle.
  • the pressure pin is stationary in the solenoid valve, and serves as a guide of the valve needle.
  • the valve pin further has a through-hole, wherein the pressure pin does not extend completely through the through-hole.
  • the connection between the control chamber and the Abêtraum carried by a fluid channel, which is arranged concentrically to the pressure pin and thus concentric with the valve needle.
  • the fuel injector includes a valve plate against which the valve needle can be brought into abutment. In this case, a sealing seat is formed, wherein the fluid channel extends centrally out of the annular sealing seat.
  • the fluid channel opens into the still free space, which is formed by the through hole within the valve needle, and limited in the stroke direction by the end face of the pressure pin.
  • the pressure-balanced arrangement of the valve needle is formed by the fact that the high pressure of the fuel radially loads the valve needle only via the bore wall, so that the Valve needle is movable in the stroke direction without force, and is actuated only by the compression spring within the solenoid, with only small hydraulic forces due to the flow dynamics of the fuel add through the sealing seat added.
  • the problem of the impact behavior of the valve needle results in particular from the pressure-balanced arrangement, since the valve needle is subjected to force neither in the opening direction nor in the closing direction.
  • the invention concludes the technical teaching that the through-bore between the pressure pin and the end-side sealing geometry comprises a flow constriction in order to fluidically dampen the stroke movement of the valve needle.
  • the advantage of the present invention resides in a merely simple geometric change of the valve needle for producing a damping effect, which utilizes a flow constriction through which the fuel, which fills the remaining space in the through-bore within the valve needle and is provided from the fluid channel, flows through.
  • a hydraulic damping can be generated, which dampens or completely avoids the impact behavior of the valve needle both in the opening stroke and in the closing stroke.
  • the fuel must flow through the flow restriction, so that a force is transmitted to the valve needle. This force slows the movement of the valve needle, wherein the degree of the selected flow restriction can be adjusted so that the dynamic behavior of the valve needle can be optimally adapted to the requirements.
  • the flow constriction can be designed in such a way that a throttle wall, in which there is at least one throttle, is introduced transversely to the lifting axis of the valve needle.
  • the throttle wall can be viewed as an interruption of the through hole near the valve needle, wherein the throttle wall is located in the portion of the through hole into which the pressure pin does not extend into.
  • a throttle chamber is formed between the end face of the pressure pin and the throttle wall, wherein the fluidic connection of the throttle chamber to the high-pressure fuel area is limited to the throttle itself.
  • the space formed inside the valve needle through the through-hole is filled with fuel in each switching state of the control valve. If the valve needle with the end-side sealing geometry is located in the sealing seat on the valve plate, the throttle chamber is maximally open in terms of its volume.
  • the anchor area of the valve needle is tightened.
  • the end sealing geometry lifts off from the sealing seat, and the valve needle slides over the pressure pin in the direction of the electromagnet.
  • the pressure pin moves deeper into the through hole inside the valve needle. Consequently, the space of the throttle chamber decreases, so that fuel must flow through the throttle.
  • the valve needle is damped by the fuel flowing through the throttle in their movement. If the energization of the electromagnet is terminated, then a compression spring within the solenoid valve pushes the valve needle again in the direction of the sealing seat, so that the throttle chamber increases in volume again. Therefore, the fuel must again flow through the throttle in the opposite direction, so that damping of the valve needle can be generated even in the closing movement.
  • the throttle is formed by a bore in the throttle wall itself, which includes edge fillets to provide improved throttle flow.
  • the throttle chamber is connected to the fuel region below the valve needle, which merges into the fluid channel.
  • the valve needle comprises a radially extending throttle, and the throttle wall is completely closed.
  • the throttle chamber communicates via the throttle with the Abberichtraum, which represents only one possible variant of the present invention.
  • the present invention is not limited to the position of the throttle in the direction of the high pressure region, wherein at least one throttle can be arranged in the throttle wall, and at the same time constitute a radially arranged throttle in the direction of the low pressure space possible variants.
  • valve needle can be provided that the opening stroke of the valve needle can be limited by a stop of the end surface of the pressure pin to the reactor wall. This can be done over a defined length of the pressure pin, so that in the open state, the throttle chamber has no more volume.
  • control valve comprises a Abberichtraum in which the valve needle is received, and by lifting the sealing geometry of the valve needle from the sealing seat, a fluid channel is vented into the Ab horrraum.
  • a fluid channel is vented into the Ab horrraum.
  • the duration of the injection can be determined, since at a termination of the energization of the electromagnet, the valve needle is pressed by the compression spring back into the sealing seat, and again sets high fuel pressure in the control room. Thus, the nozzle needle is again brought against the injection openings in a closed position.
  • electromagnet or the solenoid valve formed by this is designed either as a solenoid valve or as a piezoelectrically actuated valve.
  • a throttle is introduced in order to limit the lifting speed of the nozzle needle.
  • the venting of the control chamber is slower, so that the dynamics of the nozzle needle is limited.
  • the injector includes a high-pressure fuel chamber, and the control chamber is fluidly connected via a throttle with the high-pressure fuel chamber. About this throttle the control chamber from the high-pressure fuel chamber is again filled with fuel, so that in the control chamber again the high fuel pressure can be set when the completion of the fuel is interrupted by the fluid channel by closing the valve needle.
  • the figure is a schematic representation of a fuel injector with an inventive design of the valve needle of the control valve.
  • a fuel injector 1 according to the invention is shown schematically in cross section.
  • the fuel injector 1 comprises an injector housing 2, to which a nozzle body 3 adjoins.
  • a nozzle needle 4 is received in a liftable manner.
  • the fuel injector is in a closed state, since the nozzle needle 4 is sealingly abutted against the injection openings 5.
  • a high pressure fuel which is provided by a fuel line and duct system from a high pressure source.
  • the nozzle needle 4 is controlled via a control chamber 15, which is filled in the illustrated closed state of the fuel injector 1 with a high-pressure fuel.
  • the nozzle needle 4 is held against the injection openings 5 due to the geometric design and the associated area difference in the closing seat.
  • the control chamber 15 is vented via a fluid channel 14, the nozzle needle 4 lifts off from the injection openings 5, and the fuel can enter the combustion chamber.
  • the control of the pressurization or the pressure venting of the control chamber 15 via a control valve, which is essentially formed by a valve needle 7.
  • the valve needle 7 is movable in the direction of a lifting axis 6, wherein the movement via an electromagnet 21 can be generated.
  • the damping device is initially formed by a throttle wall 10, in which a throttle 11 is introduced. This forms between the end face of the pressure pin 8 and the throttle wall 10, a throttle chamber 12, which communicates only via the throttle 11 fluidly with the high-pressure fuel range from the fluid channel 14. If the valve needle 7 lifted by the electromagnet 21 from the sealing seat 9, so the space of the throttle chamber 12 decreases. Thus, the fuel from the throttle chamber 12 must flow through the throttle 11, which causes a throttle effect. This will be a Damping force exerted on the valve needle 7, so that the impact behavior of the valve needle 7 is avoided in the opening stroke.
  • the present invention is not limited in its execution to the above-mentioned preferred embodiment. Rather, a number of variants is conceivable which makes use of the illustrated solution even with fundamentally different types.

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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)
  • Fuel-Injection Apparatus (AREA)
EP08100932A 2007-03-08 2008-01-25 Injecteur de carburant doté d'un équipement amélioré d'une soupape de commande pour la commande d'une aiguille d'injection Not-in-force EP1967727B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007011317A DE102007011317A1 (de) 2007-03-08 2007-03-08 Kraftstoffinjektor mit einer verbesserten Ausführung eines Steuerventils zur Steuerung einer Düsennadel

Publications (3)

Publication Number Publication Date
EP1967727A2 true EP1967727A2 (fr) 2008-09-10
EP1967727A3 EP1967727A3 (fr) 2009-07-01
EP1967727B1 EP1967727B1 (fr) 2011-08-24

Family

ID=39388333

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08100932A Not-in-force EP1967727B1 (fr) 2007-03-08 2008-01-25 Injecteur de carburant doté d'un équipement amélioré d'une soupape de commande pour la commande d'une aiguille d'injection

Country Status (3)

Country Link
EP (1) EP1967727B1 (fr)
AT (1) ATE521803T1 (fr)
DE (1) DE102007011317A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011042300A1 (fr) * 2009-10-07 2011-04-14 Robert Bosch Gmbh Soupape d'injection de carburant
WO2011117029A1 (fr) * 2010-03-24 2011-09-29 Robert Bosch Gmbh Injecteur pour rampe commune comportant une soupape de commande à compensation de pression et un volume d'accumulation supplémentaire
EP2201240B1 (fr) * 2007-09-17 2012-12-19 Robert Bosch GmbH Injecteur
WO2012171767A1 (fr) * 2011-06-16 2012-12-20 Robert Bosch Gmbh Injecteur, en particulier injecteur de carburant pour un moteur à combustion interne

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1612405A1 (fr) * 2004-06-30 2006-01-04 C.R.F. Societa' Consortile per Azioni Système d'injection de carburant pour moteur à combustion interne
EP1719904A1 (fr) * 2005-05-02 2006-11-08 Robert Bosch Gmbh Injecteur de carburant
WO2008049666A1 (fr) * 2006-10-24 2008-05-02 Robert Bosch Gmbh Injecteur doté d'une soupape de commande comportant une surface de butée de course conique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1612405A1 (fr) * 2004-06-30 2006-01-04 C.R.F. Societa' Consortile per Azioni Système d'injection de carburant pour moteur à combustion interne
EP1719904A1 (fr) * 2005-05-02 2006-11-08 Robert Bosch Gmbh Injecteur de carburant
WO2008049666A1 (fr) * 2006-10-24 2008-05-02 Robert Bosch Gmbh Injecteur doté d'une soupape de commande comportant une surface de butée de course conique

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2201240B1 (fr) * 2007-09-17 2012-12-19 Robert Bosch GmbH Injecteur
WO2011042300A1 (fr) * 2009-10-07 2011-04-14 Robert Bosch Gmbh Soupape d'injection de carburant
WO2011117029A1 (fr) * 2010-03-24 2011-09-29 Robert Bosch Gmbh Injecteur pour rampe commune comportant une soupape de commande à compensation de pression et un volume d'accumulation supplémentaire
CN102822496A (zh) * 2010-03-24 2012-12-12 罗伯特·博世有限公司 具有压力补偿的转换阀和附加的储存容积的共轨喷射器
CN102822496B (zh) * 2010-03-24 2015-12-16 罗伯特·博世有限公司 具有压力补偿的转换阀和附加的储存容积的共轨喷射器
WO2012171767A1 (fr) * 2011-06-16 2012-12-20 Robert Bosch Gmbh Injecteur, en particulier injecteur de carburant pour un moteur à combustion interne
CN103635684A (zh) * 2011-06-16 2014-03-12 罗伯特·博世有限公司 喷射器，尤其是内燃机的燃料喷射器
CN103635684B (zh) * 2011-06-16 2017-06-20 罗伯特·博世有限公司 喷射器，尤其是内燃机的燃料喷射器

Also Published As

Publication number Publication date
EP1967727B1 (fr) 2011-08-24
EP1967727A3 (fr) 2009-07-01
DE102007011317A1 (de) 2008-09-11
ATE521803T1 (de) 2011-09-15

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