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EP2743493A2 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP2743493A2
EP2743493A2 EP13189766.2A EP13189766A EP2743493A2 EP 2743493 A2 EP2743493 A2 EP 2743493A2 EP 13189766 A EP13189766 A EP 13189766A EP 2743493 A2 EP2743493 A2 EP 2743493A2
Authority
EP
European Patent Office
Prior art keywords
pressure
valve
valve element
fuel injector
control
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
EP13189766.2A
Other languages
German (de)
English (en)
Other versions
EP2743493A3 (fr
EP2743493B1 (fr
Inventor
Henning Kreschel
Christian Grimminger
Holger Rapp
Marco Beier
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 EP2743493A2 publication Critical patent/EP2743493A2/fr
Publication of EP2743493A3 publication Critical patent/EP2743493A3/fr
Application granted granted Critical
Publication of EP2743493B1 publication Critical patent/EP2743493B1/fr
Active 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
    • F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
    • F02M63/0005—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using valves actuated by fluid 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
    • F02M63/0028—Valves characterised by the valve actuating means hydraulic
    • 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
    • F02M2200/28—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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/001—Control chambers formed by movable sleeves
    • 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
    • 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
    • F02M2547/008—Means for influencing the flow rate out of or into a control chamber, e.g. depending on the position of the needle

Definitions

  • the connection to the fuel return is closed again.
  • fuel flows from at least one throttle element from a high-pressure fuel volume in the control chamber, with the result that the nozzle needle is displaced again in the direction of its rest position and closes.
  • the proposed fuel injector comprises a control valve for controlling the lifting movement of a liftable nozzle needle for releasing and closing at least one injection opening, wherein the end of the nozzle needle facing away from the injection opening delimits a control space.
  • the control chamber can be filled to influence a control chamber pressure acting on the nozzle needle via an inlet throttle with high-pressure fuel and can be relieved in the open position of the control valve via an outlet throttle.
  • upstream of the inlet throttle is a pressure-actuated further valve with a displaceable valve element for releasing and closing a hydraulic connection of the inlet throttle formed with a high-pressure region. Due to the further valve formed upstream of the inlet throttle, the inflow from a high-pressure fuel volume into the control chamber can be interrupted.
  • the control valve is opened and the control chamber is relieved via the outlet throttle.
  • the control chamber is relieved faster because no additional amount of fuel flows into the control chamber, on the other hand, the return flow reduces and thus increases the efficiency of the fuel injection system.
  • the outlet throttle can be designed with a considerably reduced throttle cross-section.
  • the valve element of the pressure-actuable further valve has a first control surface, which abuts the pressure prevailing in the control chamber, and at least one further control surface, at which the downstream of the outlet throttle between the outlet throttle and a valve seat of the control valve and / or the upstream of the inlet throttle between the other valve and the inlet throttle ruling pressure prevails.
  • the first control surface therefore preferably limits - together with the nozzle needle - the control chamber in the axial direction.
  • the at least one further control surface preferably defines a further pressure chamber, which is formed downstream of the outlet throttle in front of the valve seat of the control valve and / or upstream, preferably immediately upstream, of the inlet throttle.
  • the control chamber pressure preferably causes a force acting on the valve element in the closing direction, while the pressure in at least one further pressure chamber causes a force acting on the valve element in the opening direction. If, for example, the control valve is opened, the pressure drops sharply in at least one further pressure space, preferably between the outlet throttle and the valve seat of the control valve. The pressure difference causes the other valve closes and there is no connection of the control chamber via the inlet throttle with the high-pressure region of the fuel injector. This means that no fuel can flow into the control chamber via the inlet throttle. As a result, the amount of fuel flowing out via the outlet throttle is significantly reduced. Only the amount of fuel displaced from the control chamber by the nozzle needle in the course of its opening movement must still escape via the outlet throttle from the control chamber.
  • the outlet throttle can be designed in the episode with a much smaller throttle cross-section, without thereby reducing the opening speed of the nozzle needle or delayed the beginning of the injection.
  • valve element of the pressure-actuatable further valve is acted upon in the closing direction by the spring force of a spring.
  • the spring serves to return the valve element of the further valve after the end of an injection.
  • the spring is supported either directly or indirectly on the one hand on the valve element and on the other hand on the nozzle needle. In this way, the spring can be used in addition to the loading of the nozzle needle with a force independent of the high pressure closing force.
  • the valve element limits the control chamber in the axial and / or radial direction. This simplifies the formation of a first control surface to which control chamber pressure is applied.
  • the valve element may be designed to be piston-shaped and / or have a section designed as a hollow piston.
  • the valve element has a preferably axially extending bore in which the outlet throttle is formed.
  • the bore preferably opens on the one hand into the control chamber and on the other hand into a further pressure chamber, which is delimited by a further control surface of the valve element.
  • the bore thus connects the control room with the further pressure chamber.
  • This further pressure chamber is preferably formed between the outlet throttle and the valve seat of the control valve.
  • the valve element has an inlet bore extending preferably radially or obliquely to a longitudinal axis A of the valve element, which connects the control chamber to a pressure chamber.
  • the inlet throttle is preferably formed in the inlet bore or upstream thereof outside of the valve element.
  • the radially or obliquely extending inlet bore opens on the one hand into the control chamber upstream of the outlet throttle, on the other hand into a pressure chamber, which is connectable in dependence on the switching position of the other valve with the high-pressure region of the fuel injector.
  • the valve element is at least partially axially slidably received in a guide bore of a valve member, wherein the guide bore is designed to form at least one pressure chamber and / or cooperating with the valve element annular sealing edge stepped.
  • the annular sealing edge seals the at least one further pressure chamber with respect to the high-pressure region of the fuel injector when the valve element bears against the sealing edge.
  • the annular sealing edge can also be arranged on the valve element and interact with a sealing surface on the valve piece.
  • valve element delimit the at least one pressure chamber formed in the guide bore in the radial and / or axial direction.
  • the surfaces defining a pressure chamber in the axial direction preferably also serve as control surfaces, via which the valve element of the further valve can be acted upon by a pressure force.
  • the valve element defines at least two pressure chambers, which are arranged at an axial distance from one another and are hydraulically connected via the inlet throttle.
  • the inlet throttle is preferably formed in the valve piece and not in the valve element.
  • the valve element is acted upon in the opening direction of the spring force of a spring - alternatively or in addition to acting in the closing direction spring force of the aforementioned spring.
  • the spring force of the further, acting in the opening direction spring is preferably selected to be greater than the spring force of the spring acting in the closing direction. This applies in particular when the spring acting in the closing direction also serves to return the nozzle needle.
  • the spring force of the other spring causes the other valve in the idle state assumes an open position.
  • the valve element has a cooperating with a stroke stop radially extending stop surface.
  • the opening stroke of the valve element is limited in this way.
  • the stroke stop can be formed by a body of the fuel injector, in particular a nozzle body or a holding body, or by a separate, preferably disk-shaped component.
  • the disk-shaped component is used in the high-pressure region of the fuel injector and preferably has at least one through-flow opening in order to ensure a connection of the pressure chambers located on either side of and beyond the disk-shaped component.
  • the Indian FIG. 1 schematically illustrated fuel injector according to the invention comprises a liftable nozzle needle 2 for releasing and closing a plurality of injection openings 3.
  • the movement of the nozzle needle 2 is controlled by a control valve 1, which in the present case designed as a ball valve and a solenoid actuator 27 can be actuated.
  • the pressure drop in the control chamber 4 has the consequence that the nozzle needle 2, which limits the control chamber 4 with one end, opens and the injection openings 3 releases. High-pressure fuel from a high-pressure region 11 is then injected into the combustion chamber of an internal combustion engine (not shown) via the injection openings 3. To close the nozzle needle 2, the activation of the solenoid actuator 27 is terminated, so that the spring force of the spring 29 causes the return of the anchor member 31, wherein the spherical control valve member 28 is placed back in the valve seat 30 and the control valve 1 closes.
  • the fuel flowing through an inlet throttle 8 from a volume of fuel under high pressure into the control chamber 4 causes a reversal of direction of the nozzle needle movement and, consequently, a continuous closing movement of the nozzle needle 2.
  • the nozzle needle 2 returns to its starting position spent and the injection ends.
  • a pressure-actuatable further valve 9 is arranged upstream of the inlet throttle 8, which interrupts the supply of high-pressure fuel to the inlet throttle 8 and then into the control chamber 4 in the closed position.
  • the pressure-actuable further valve 9 has a displaceable valve element 10 with a first control surface 12 and a second control surface 13.
  • the first control surface 12 limits the control chamber 4, so that here control chamber pressure is applied.
  • the pressure prevails downstream of the outlet throttle 7 between the outlet throttle 7 and the valve seat 30 of the control valve 1. With the opening of the control valve 1, the pressure drops downstream of the outlet throttle 7 more than in the control chamber 4.
  • the high-pressure fuel from a high-pressure volume 11 of the injector in front of the sealing seat of the other valve 9 may act on a part of the second control surface 13, which favors the immediate initiation of the opening operation of the further valve 9 after closing the control valve 1.
  • the first still present opening movement of the nozzle needle 2 now leads to a compression of the fuel in the control chamber 4 and thus to a brief Increase in the control room pressure.
  • the control chamber pressure may exceed the high pressure in the high-pressure region 11 of the injector. Due to the increase in the control chamber pressure, the nozzle needle 2 is braked and reverses its direction of movement, so that the fuel in the control chamber 4 relaxes again and the control chamber pressure decreases again. If the sealing diameter 20 selected larger than the control chamber diameter, so the short-term exceeding the pressure level in the high pressure chamber 11 by the pressure in the control chamber 4 and in the pressure chambers 17, 18 and 19 results in a resulting opening force on the valve element 10 and thus to open at the Sealing edge 20 formed sealing seat.
  • the opening operation of the valve element 10 causes a further increase in the force in the opening direction on the valve element 10 and thus a positive feedback on the opening movement, which stabilizes the opening operation of the other valve 9.
  • a received between the valve member 16 and a body 24 disc-shaped member 25 forms a stroke stop 22, which cooperates with a radially extending stop surface 23 on the valve element 10 to limit limiting.
  • the spring 14 which at the same time serves as a nozzle needle closing spring in the present case, is not supported on the valve element 10 but, for example, on the body 24, it is not necessary for the spring force of the spring 21 to be greater than that of the spring 14.
  • An additional spring 21, whose spring force acts on the valve element 10 in the opening direction, can also in the in the FIGS. 3 to 5 used embodiment shown.

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)
EP13189766.2A 2012-12-14 2013-10-22 Injecteur de carburant Active EP2743493B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012223166.8A DE102012223166A1 (de) 2012-12-14 2012-12-14 Kraftstoffinjektor

Publications (3)

Publication Number Publication Date
EP2743493A2 true EP2743493A2 (fr) 2014-06-18
EP2743493A3 EP2743493A3 (fr) 2015-07-29
EP2743493B1 EP2743493B1 (fr) 2017-02-08

Family

ID=49447474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13189766.2A Active EP2743493B1 (fr) 2012-12-14 2013-10-22 Injecteur de carburant

Country Status (2)

Country Link
EP (1) EP2743493B1 (fr)
DE (1) DE102012223166A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015205582A1 (de) * 2015-03-27 2016-09-29 Robert Bosch Gmbh Kraftstoffinjektor für ein Kraftstoffeinspritzsystem
DE102015226070A1 (de) * 2015-12-18 2017-06-22 Robert Bosch Gmbh Kraftstoffinjektor
DE102017205772A1 (de) 2017-04-05 2018-10-11 Robert Bosch Gmbh Kugelventil
EP3990770A1 (fr) * 2019-06-25 2022-05-04 Ganser-Hydromag AG Soupape d'injection de carburant pour des moteurs à combustion interne

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006049050A1 (de) 2006-10-18 2008-04-30 Robert Bosch Gmbh Injektor zum Einspritzen von Kraftstoff

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4428357B2 (ja) * 2006-04-03 2010-03-10 株式会社デンソー 燃料噴射弁
CH700396A1 (de) * 2009-02-09 2010-08-13 Ganser Hydromag Brennstoffeinspritzventil für Verbrennungskraftmaschinen.
JP5531713B2 (ja) * 2010-03-29 2014-06-25 株式会社デンソー 燃料噴射装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006049050A1 (de) 2006-10-18 2008-04-30 Robert Bosch Gmbh Injektor zum Einspritzen von Kraftstoff

Also Published As

Publication number Publication date
EP2743493A3 (fr) 2015-07-29
DE102012223166A1 (de) 2014-06-18
EP2743493B1 (fr) 2017-02-08

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