EP2331806B1 - Injecteur comportant un filtre à particules disposé en amont de la restriction d'admission - Google Patents

Injecteur comportant un filtre à particules disposé en amont de la restriction d'admission Download PDF

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Publication number
EP2331806B1
EP2331806B1 EP09780500.6A EP09780500A EP2331806B1 EP 2331806 B1 EP2331806 B1 EP 2331806B1 EP 09780500 A EP09780500 A EP 09780500A EP 2331806 B1 EP2331806 B1 EP 2331806B1
Authority
EP
European Patent Office
Prior art keywords
fuel
injector
particle filter
hollow cylindrical
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.)
Not-in-force
Application number
EP09780500.6A
Other languages
German (de)
English (en)
Other versions
EP2331806A1 (fr
Inventor
Andreas Fath
Bjoern Scholemann
Helmut Clauss
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 EP2331806A1 publication Critical patent/EP2331806A1/fr
Application granted granted Critical
Publication of EP2331806B1 publication Critical patent/EP2331806B1/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
    • 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
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • 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
    • F02M2200/27—Fuel-injection apparatus with filters
    • 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
    • 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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails

Definitions

  • the invention relates to an injector, in particular to an injector in a storage injection system of an internal combustion engine having a particle filter for cleaning the high-pressure fuel supplied to a control chamber of the injector according to the preamble of patent claim 1.
  • a high-pressure pump delivers the fuel under high pressure into a central high-pressure accumulator, which is arranged outside the injector and is also referred to as a rail. From the high pressure accumulator high pressure lines lead to the individual injectors, which are assigned to the cylinders of the internal combustion engine.
  • a nozzle needle valve is provided with a pressure chamber which is actuated via a valve control piston.
  • the injector has a control chamber and a control valve associated control valve.
  • the high-pressure fuel is present in the pressure chamber and on the control valve.
  • the control piston With an opening of the control valve, the control piston is relieved, whereby the high-pressure fuel in the pressure chamber raises the nozzle needle, so that the fuel from the pressure chamber at the raised nozzle needle is injected over the injectors into the combustion chamber of the internal combustion engine.
  • the accuracy and proper operation of this device of the storage injection system is particularly vulnerable to particles that can be supplied to the injector with the fuel.
  • the pressure-compensating control valves act as a filter due to a stroke size of 20 to 30 microns for larger particles, particles partially enter the seating area of the control valve and damage it considerably.
  • the damage occurs mainly on the inner diameter of the seat portion of the control valve, wherein at the inner edge of the seat area strong deformations occur, which can lead to leakage and thus malfunction of the pressure-compensating control valve.
  • valve seat For this purpose, it is known from the prior art to provide the valve seat with a special coating in order to limit damage to the valve seat caused by particles.
  • coating of the valve seat has led to no improvement here.
  • the use of a rod filter in the fuel inlet of the injector has proved to be insufficient due to its gap height of 40 to 80 microns to keep particles smaller size of the control valve away.
  • the fuel filter which filters particles up to a size of 3 ⁇ m and located in front of the high pressure pump, is located too far upstream of the injector so that particles from the high pressure lines and the high pressure pump, despite the fuel filter and the rod filter, enter the injector. Due to the limited space in the injector, the integration of a commercially available filter with a sufficient filter effect from a design point of view is difficult, with the disadvantage that there is a significant pressure loss of the fuel supplied through the filter is to be expected.
  • a fuel injector for filtering foreign body particles from fuel in a common rail system.
  • the fuel injector has a socket with an inlet channel, which ensures a fluid connection with a control chamber.
  • a filter is further provided, the fuel that flows to the control chamber, cleans of foreign particles.
  • the filtering effect occurs in areas of the filter in which a light area is formed on both sides of the filter.
  • a disadvantage of such a fuel injector is that the filtering effect is limited, and thus the efficiency of the filtering of the fuel entering the control chamber is low.
  • the invention has for its object to provide a filter device for an injector, which reliably protects the control valve of the injector against the particles supplied with the fuel and reduces the pressure of the injected fuel within the injector only insignificantly.
  • the injector comprises an injector housing with a fuel inlet, through which the fuel is preferably supplied from a central high pressure accumulator from the injector under high pressure.
  • the injector is used in such a memory injection or common rail system for controlling the injection process of high-pressure fuel into the combustion chamber of an internal combustion engine.
  • the injector has a high-pressure channel which connects the fuel inlet in terms of flow with a pressure chamber.
  • the fuel is in this case injected from the pressure chamber via injector nozzles in the combustion chamber of the internal combustion engine, wherein the injection process is carried out in dependence on a control valve which is associated with a control chamber of a control piston.
  • the control chamber is in this case hydraulically connected via an inlet throttle with the fuel inlet, so that in addition to the main flow of fuel, which the Pressure space is supplied, a side stream of fuel is passed into the control chamber of the control piston.
  • the nozzle needle driven via the control piston is opened when the fuel pressure in the pressure chamber is greater than the fuel pressure in the control chamber.
  • the control valve is in this case hydraulically connected to a fuel return and therefore serves to regulate the pressure conditions of the fuel located in the control chamber.
  • a particle filter is arranged, the high-pressure fuel before entering the control chamber of the control piston filters.
  • the inventive arrangement of a particulate filter immediately upstream of the inlet throttle results in the advantage that only that portion of the volume flow of fuel is filtered, which flows via the inlet throttle and the control chamber to the control valve, which is particularly vulnerable to particles.
  • the main stream of fuel is conducted directly and unfiltered from the fuel feed via the high-pressure passage to the pressure chamber without a pressure loss caused by the particulate filter.
  • the split-off of the volume flow of fuel into a main flow guided to the pressure chamber and a bypass flow guided to the control chamber is used in an advantageous manner in order to filter only that portion of the volume flow of fuel which flows via the control chamber to the control valve.
  • the high-pressure fuel flows through the fuel feed into the injector, for example with a flow rate of up to 7 l / min, whereas only maximum flow values of approximately 0.6 l / min occur at the inlet throttle under the same operating conditions. Due to the smaller volume of the particle flow flowing through the secondary flow of fuel, the filter has a high efficiency and a high fatigue strength.
  • a cavity is arranged, which serves to receive the particulate filter.
  • the cavity is formed as an annular space which surrounds the control chamber in an annular manner.
  • the control room is here separated from the annulus by a control room wall.
  • the control chamber wall which preferably has the shape of a sleeve and limits the control chamber, in this case comprises the inlet throttle, which connects the control chamber hydraulically via the annular space with the fuel inlet.
  • the particle filter has a hollow cylindrical shape and extends around the circumference of the control chamber wall.
  • the hollow cylindrical particle filter has a larger flow area, which results from the size of the lateral surface of the hollow cylindrical particle filter.
  • the hollow cylindrical particle filter can subdivide the annular space into a first and a second region.
  • the first region of the annular space in this case faces the fuel inlet, whereas the second region of the control chamber wall is assigned.
  • the first and the second area have the same height.
  • the particle filter preferably extends over the height of the annular space. This results in the advantage that the fuel flows through the particle filter in a substantially radial direction, resulting in an optimal filter effect with only a slight loss of fuel pressure.
  • control chamber wall, the control valve, the control chamber and the inlet throttle is associated with a valve piece which is inserted into the housing of the injector.
  • the particulate filter is fastened between the injector housing and the valve piece.
  • the particle filter is clamped between the injector housing and the valve piece, whereby an additional fixation of the particulate filter within the annular space is unnecessary.
  • a releasable attachment of the valve member in the injector further results in the advantage that the particulate filter is interchangeable.
  • the particulate filter can be designed as a fine mesh fabric filter, whereby it can be produced in a simple and cost-effective manner.
  • the particle filter preferably consists of at least one synthetic layer.
  • the particle filter has an opening width which is smaller than the stroke of the control valve. This advantageously prevents that Particles whose size is greater than the stroke of the control valve, can penetrate to this and accumulate in the seating area.
  • the stroke of known from the prior art control valves is in this case usually between 20 and 30 microns.
  • a further particle filter is provided in the injector.
  • the particulate filter can be assigned to both the fuel inlet and the high-pressure line, which connects the pressure chamber hydraulically with the fuel inlet.
  • the use of a laser drilled filter in cup form has been found to be particularly advantageous, since in this the pressure loss of the high-pressure fuel is low.
  • FIG. 1 is schematically an injector 1 for the injection of high-pressure fuel in a in FIG. 1 To remove not shown combustion chamber of an internal combustion engine.
  • the injector 1 comprises a housing 2 with a fuel inlet 4, via which high-pressure fuel is supplied to the injector 1.
  • the injector 1 via an in FIG. 1 not shown high-pressure line in terms of flow with a central high-pressure accumulator - the so-called rail - connected.
  • the high pressure accumulator is supplied via a high pressure pump fuel under high pressure from a fuel tank.
  • injector 1 may be connected to the central high-pressure accumulator further injectors, which are supplied via further high-pressure lines with fuel.
  • the fuel supplied to the injector 1 via the fuel inlet 4 is divided into a main and a secondary flow after entering the injector 1, the main flow being conducted via a high-pressure channel 6 to a pressure chamber 8 and the secondary flow via an inlet throttle 16 to a control chamber 12 becomes.
  • the control chamber 12 is arranged above a control piston 14 which is in operative connection with a prestressed nozzle needle 22, which closes the injection nozzles 28 of the injector 1. Via the inlet throttle 16, the control chamber 12 is thus supplied with only a control amount of fuel, which is required to control the control piston 14.
  • the nozzle needle 22, which is biased by a spring member 24 against the nozzle needle seat in the region of the injection nozzle 28 is lifted from the nozzle needle seat when the fuel pressure in the pressure chamber 8 is greater than the fuel pressure in the control chamber 12 of the control piston 14.
  • the control chamber 12 is associated with a control valve 10, via which the fuel pressure in the control chamber 12 and thus the injection of fuel from the pressure chamber 8 via the injection nozzle 28 is controllable in the combustion chamber of the internal combustion engine.
  • the control valve 10 is in this case connected via an outlet throttle 20 in terms of flow with the control chamber 12. Upon opening of the control valve 10, the fuel flowing through the outlet throttle 20 from the control chamber 12 via a fuel return passage 26 to a in FIG. 1 not shown fuel tank returned.
  • an actuator 30 is provided in the injector 1, which opens the control valve 10 against a compression spring force.
  • the control valve 10 reliably seals the control chamber 12 in the direction of the fuel return 26.
  • a particle filter 18 is arranged between the fuel inlet 4 and the inlet throttle 16, which filters the fuel flow which is supplied to the control chamber 12 in a reliable manner.
  • FIG. 2 shows a detailed view of an embodiment of the invention, in which a valve piece 32 is received in the housing 2 of an injector 1.
  • injector 1 substantially with the in FIG. 1
  • the same reference numbers are used to designate the same parts.
  • the valve piece 32 has a multi-stepped bore which extends through the valve piece 32 and is closed on the upper side by a valve ball 36.
  • the valve ball 36 is a part of the control valve 10, which is opened or closed depending on the position of the valve ball 36.
  • the valve ball 36 rests in a ball seat and is in the in FIG. 2 illustrated closed state of the control valve 10 is acted upon by an armature 38 with a compressive force.
  • an outlet throttle 20 is arranged, which reduces the discharged from the control chamber 12 volumetric flow of fuel via the open control valve 10 to the in FIG. 1 shown fuel return 26 is passed.
  • valve piece 32 The arranged in the valve piece 32 control chamber 12 is bounded by a control chamber wall 40, in which the inlet throttle 16 is arranged.
  • a cavity designed as an annular space 34 is provided, which surrounds the valve member 32 at the level of the control chamber 12.
  • the particle filter 18 is disposed within the annular space 34, which surrounds the control chamber wall 40 of the valve member 32 at a distance.
  • FIG. 3 the arranged in the annular space 34 particulate filter 18 of the injector 1 is shown in a detailed view.
  • the particulate filter 18 divides the annular space 34 provided between the injector housing 2 and the valve piece 32 into a first area 42 and a second area 44.
  • the second area 44 of the annular space 34 which is fluidly associated with the inlet throttle 16 and the control space 12, extends at least over a portion of the height of the particulate filter 18th
  • the first and second region 42, 44 of the annular space 34, the particulate filter 18 and the control chamber wall 40 are arranged coaxially to the control chamber 12 of the valve member 32.
  • the fuel subjected to high pressure initially flows, starting from the fuel inlet 4, into the first region 42 of the annular space 34, from where the fuel flows through the particle filter 18 into the second region 44 of the annular space 34, before passing through the fuel chamber Control chamber wall 40 of the valve member 32 arranged inlet throttle enters the control chamber 12.
  • the fürström tone of the particulate filter 18 thus corresponds to its lateral surface, so that only a small pressure losses in the supply of highly pressurized fuel into the control chamber 12 by a spaced around the circumference of the control chamber wall 40 of the valve piece 32 arranged particulate filter 18. From the low pressure loss of the fuel when flowing through the particulate filter 18 of the particulate filter 18 is also only slightly stressed, so that there is a high fatigue strength of the particulate filter 18.

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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)

Claims (7)

  1. Injecteur pour l'injection de carburant dans la chambre de combustion d'un moteur à combustion interne, comprenant un carter d'injecteur (2) comportant une admission de carburant (4) pour l'admission de carburant amené sous haute pression relié, dans le sens de l'écoulement, à une chambre de pression (8), via un canal sous haute pression (6), le carburant étant injecté hors de ladite chambre en fonction de la position d'une soupape de commande (10), la soupape de commande (10) étant associée à une chambre de commande (12) d'un piston de commande (14) relié, dans le sens de l'écoulement, à l'admission de carburant (4) via un étranglement d'admission (16) et un filtre à particules (18) en forme de cylindre creux étant disposé avant l'étranglement d'admission (16) dans le sens de l'écoulement du carburant, ledit filtre filtrant le carburant entrant dans la chambre de commande (12), le filtre à particules (18) en forme de cylindre creux comportant une surface d'écoulement traversant obtenue à partir de la taille d'une surface d'enveloppe du filtre à particules (18) en forme de cylindre creux et une chambre creuse (34) étant prévue entre l'admission de carburant (4) et l'étranglement d'admission (16), le filtre à particules (18) en forme de cylindre creux étant disposé dans ladite chambre, la chambre creuse étant une chambre annulaire (34) entourant la chambre de commande (12), la chambre de commande (12) logée dans une soupape (32) étant délimitée par une paroi de chambre de commande (40) comprenant l'étranglement d'admission (16) autour de la périphérie de laquelle s'étend le filtre à particules (18) en forme de cylindre creux, caractérisé en ce que la soupape (32) est insérée dans le carter d'injecteur (2), le filtre à particules (18) en forme de cylindre creux étant fixé entre le carter d'injecteur (2) et la soupape (32).
  2. Injecteur selon la revendication 1, caractérisé en ce que le filtre à particules (18) en forme de cylindre creux subdivise la chambre annulaire (34) en une première zone (42) orientée vers l'admission de carburant (4) et en une deuxième zone (44) orientée vers la paroi de chambre de commande (40).
  3. Injecteur selon la revendication 2, caractérisé en ce que les première et deuxième zones présentent pour l'essentiel la même hauteur.
  4. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que le filtre à particules (18) en forme de cylindre creux est un tissu à maille fine.
  5. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que le filtre à particules (18) en forme de cylindre creux présente une action de filtre pouvant atteindre 15 µm.
  6. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce que le filtre à particules (18) en forme de cylindre creux présente une largeur d'ouverture dont la taille est inférieure à la course de la soupape de commande (10).
  7. Injecteur selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un filtre à particules supplémentaire filtrant au moins le carburant amené à la chambre de pression (8) est prévu à l'intérieur de l'injecteur (1).
EP09780500.6A 2008-09-01 2009-07-13 Injecteur comportant un filtre à particules disposé en amont de la restriction d'admission Not-in-force EP2331806B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810041730 DE102008041730A1 (de) 2008-09-01 2008-09-01 Injektor mit einem vor der Zulaufdrossel angeordneten Partikelfilter
PCT/EP2009/058908 WO2010023024A1 (fr) 2008-09-01 2009-07-13 Injecteur comportant un filtre à particules disposé en amont du papillon d'admission

Publications (2)

Publication Number Publication Date
EP2331806A1 EP2331806A1 (fr) 2011-06-15
EP2331806B1 true EP2331806B1 (fr) 2014-10-08

Family

ID=41381566

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09780500.6A Not-in-force EP2331806B1 (fr) 2008-09-01 2009-07-13 Injecteur comportant un filtre à particules disposé en amont de la restriction d'admission

Country Status (3)

Country Link
EP (1) EP2331806B1 (fr)
DE (1) DE102008041730A1 (fr)
WO (1) WO2010023024A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012222509A1 (de) * 2012-12-07 2014-06-12 Continental Automotive Gmbh Piezoinjektor
JP6202606B2 (ja) * 2013-07-08 2017-09-27 ボッシュ株式会社 燃料噴射弁
US20170234284A1 (en) * 2013-11-20 2017-08-17 Stanadyne Llc Woven Mesh Debris Shield for Fuel Injector
US9644589B2 (en) * 2013-11-20 2017-05-09 Stanadyne Llc Debris diverter shield for fuel injector
DE102014001139B4 (de) 2014-01-28 2016-04-07 L'orange Gmbh Kraftstoffinjektor
EP2940287A1 (fr) * 2014-05-01 2015-11-04 Delphi International Operations Luxembourg S.à r.l. Filtre d'injecteur de carburant
EP2940286A1 (fr) * 2014-05-01 2015-11-04 Delphi International Operations Luxembourg S.à r.l. Filtre d'injecteur de carburant
FR3051229B1 (fr) * 2016-05-13 2021-02-19 Delphi Int Operations Luxembourg Sarl Injecteur de carburant pour moteur a combustion interne

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1319838B1 (it) * 2000-02-15 2003-11-03 Elasis Sistema Ricerca Fiat Perfezionamenti di un'elettrovalvola per la regolazione dellapressione di alimentazione di combustibile ad un motore a combustione
DE10304788A1 (de) * 2003-02-06 2004-08-19 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung, insbesondere für Brennkraftmaschinen mit Kraftstoff-Direkteinspritzung
DE102005035347B3 (de) * 2005-07-28 2006-08-10 L'orange Gmbh Kraftstoffinjektor

Also Published As

Publication number Publication date
DE102008041730A1 (de) 2010-03-04
WO2010023024A1 (fr) 2010-03-04
EP2331806A1 (fr) 2011-06-15

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