EP1045976B1 - Unite de commande pour commander la montee en pression dans un ensemble pompe - Google Patents

Unite de commande pour commander la montee en pression dans un ensemble pompe Download PDF

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Publication number
EP1045976B1
EP1045976B1 EP99952405A EP99952405A EP1045976B1 EP 1045976 B1 EP1045976 B1 EP 1045976B1 EP 99952405 A EP99952405 A EP 99952405A EP 99952405 A EP99952405 A EP 99952405A EP 1045976 B1 EP1045976 B1 EP 1045976B1
Authority
EP
European Patent Office
Prior art keywords
guide element
bore
valve
control unit
valve body
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.)
Expired - Lifetime
Application number
EP99952405A
Other languages
German (de)
English (en)
Other versions
EP1045976A1 (fr
Inventor
Friedrich BÖCKING
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 EP1045976A1 publication Critical patent/EP1045976A1/fr
Application granted granted Critical
Publication of EP1045976B1 publication Critical patent/EP1045976B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means

Definitions

  • the present invention relates to a control unit for Control of pressure build-up in a pump unit.
  • the Control unit includes a control valve and with it connected valve actuation unit.
  • the control valve is considered an inward flow direction opening I-valve.
  • the control valve points one axially displaceable in a housing of the control unit mounted valve body, which when closed Control valve from the inside on a valve seat of the Control valve sits.
  • An axially effective surface of the Valve body is designed such that the forces that with the control valve closed due to the applied pressure the pump unit act on the valve body balance each other.
  • the valve body is by means of a viewed first in the direction of flow Guide element axially displaceable in the housing stored.
  • the invention also relates to an injection system for Fuel supply into a combustion chamber from direct-injection internal combustion engines with a Pump unit to build up an injection pressure and then to Injecting the fuel into the fuel injector Combustion chamber.
  • Control units are known in the art, for example, which control the Pressure build-up of pump units to build a Injection pressure of an injection system for fuel supply into a combustion chamber of direct injection Control internal combustion engines.
  • Such Control units are usually used as solenoid valves educated.
  • the valve actuation unit is as one Electromagnet formed, which actuates the control valve.
  • the solenoid valve is open when not energized. This ensures a free flow from the pump unit given the low pressure area of the injection system and thus filling the pump chamber with fuel during of the suction stroke of the pump piston and a backflow of the Possible during the delivery stroke.
  • An approach of the solenoid valve during the delivery stroke of the pump piston closes this bypass. This leads to a build-up of pressure in the high pressure area of the system.
  • control valve In the control units known from the prior art the control valve is usually as an in Flow direction inward opening so-called I-valve educated. I valves have opposite in the direction of flow so-called A valves opening outwards have the advantage that they are much easier and cheaper to manufacture.
  • valve actuation units must be the state of the art are chosen so that they always a sufficient force to operate the Can apply control valves. This requires in the As a rule, particularly large valve actuation units.
  • the use of piezoelectric actuators as Valve actuation units is the control valve Control units excluded according to the state of the art, because the valve actuation forces applied by them or valve actuation strokes are usually not sufficient are large to operate the known control valves.
  • the pressure forces of the in the control valve medium used to the Reduce valve actuation forces to a minimum, and depending on the pressure of the medium.
  • the medium on the valve body acts on the Valve body on the two axially effective surfaces equally large, but opposing compressive forces balance each other.
  • Frictional or spring forces The axially effective surface of the valve body can also be designed such that the resulting force counteracts the other forces, so that in the sum of all on the valve body acting forces result in minimal valve actuation forces.
  • control unit according to the invention advantageously has very short switchover times.
  • the switchover times are approximately 100.10 -6 s.
  • the cross section through the valve body and the course of the The valve seat can have any contour.
  • predominate for manufacturing reasons round shapes, for example circles or ellipses. But there are also Contours conceivable that do not have a round course.
  • valve body conveniently and with little effort between arranged and relative to the individual housing parts be positioned.
  • the individual housing parts By joining the individual housing parts to the finished housing can Valve body in a simple way in a defined Position within the housing.
  • the valve body be circular Has cross section and by means of a flow direction internal first guide element in the housing is axially displaceably mounted, and that the valve seat has an annular shape, and that the Outside diameter of the first guide element is equal to that Outside diameter of the valve seat is.
  • a first annular axially effective surface educated.
  • Around the valve seat also in Flow direction inside is one to the outside Directed equally large second circular axially effective area formed.
  • the pressure of the closed control valve applied to the valve body Medium creates the same size on the two annular surfaces equal pressure forces.
  • the Compression forces are opposed to each other and are the same from.
  • the valve actuation forces are thus at any pressure occurring on the valve body minimal.
  • valve body in the housing For a safe guidance of the valve body in the housing to ensure the control unit is the Valve body according to an advantageous embodiment by means of a second one located outside in the direction of flow Guide element axially displaceable in the housing stored. So that the valve body is on both sides of the Valve seat by a guide element in the housing axially movably mounted. This allows a full-surface support of the valve body on the valve seat and reliable Sealing function of the valve seat.
  • the second guide element is designed in this way axially effective surface has the forces that with the control valve open due to the applied pressure the valve body act almost mutually compensate.
  • the control valve When the control valve is open, the in Direction of flow outward axially effective Surface of the valve body enlarged by an area, which when the control valve is closed through the valve seat of the pressure applied to the valve body is shielded.
  • the control valve When the control valve is open, the pressure is applied one facing inwards in the direction of flow Valve body acting force.
  • the second guide element has a running around the valve body, in Flow direction inward axially effective Surface on which the control valve is open applied pressure acts and to an outward, force acting on the valve body. Independent of the size of the applied print is the same Forces almost out. This can be done at any high pressure always a controlled retraction of the valve body be ensured.
  • a spring element is arranged which the valve body in one inactive state of the valve actuation unit in a passage position pushes away from the valve seat.
  • Control valve thus open, i.e. H. that of the Pump unit can be pumped free of the medium Pump unit to the low pressure area of the system and flow back again.
  • the control valve is thus filled with the pump chamber the medium to be pumped during the suction stroke of the Pump piston and a backflow of the medium during the Delivery stroke possible.
  • the valve operating unit as a piezoelectric Actuator trained.
  • Control unit come into play especially when that Control valve controlled by a piezoelectric actuator becomes. Since in the control unit according to the invention Actuation of the control valve no or extremely little Valve actuation forces must be applied, the maximum stroke of a piezoelectric actuator can be used. And especially because when closed Control valve only the smallest power reserves Valve actuation unit are necessary to the Keep control valve in the closed position.
  • the second housing part is advantageously as one Socket designed to accommodate a third bore of the second guide element.
  • the play between the first guide element and the first bore is preferably about 2 to 4.10 -6 m and the play between the second guide element and the third bore is about 8 to 10.10 -6 m.
  • the injection system has a control unit according to the invention.
  • a control unit can, for example, as a pump-nozzle unit (PDE) or as a pump-line-nozzle system (PLD) be trained.
  • PDE pump-nozzle unit
  • PLD pump-line-nozzle system
  • the first and second holes are made in one operation inserted the housing, d. H. without the drill after the drill the first hole and without it before the second Reposition the hole.
  • the axis offset is between the first and second holes to a minimum reduced. Only the second housing part with the third Hole must be relative to the first two holes like this be positioned so that the axis offset is as small as possible is.
  • the injection system 1 shows an injection system in its entirety marked with the reference number 1.
  • the injection system 1 is used to supply fuel to a combustion chamber of direct-injection internal combustion engines. It points a pump unit 2 for building up an injection pressure and for injecting the fuel via an injection nozzle 3 into the combustion chamber. Furthermore, that points Injection system 1, a control unit 4, with a schematically illustrated control valve 5 and one Valve actuation unit 6 for controlling the pressure build-up in the pump unit 2.
  • the injection system 1 is designed as a unit injector (PDE) educated.
  • PDE unit injector
  • the pump unit 2 and the Injector 3 one unit.
  • a pump chamber 9 of the pump unit 2 is bypass holes 26 with the control valve 5 of the control unit 4 connected.
  • the control valve 5 is in the non-excited state the electrical control unit 4 opened. This is a free flow from the pump unit 2 to the Given the low pressure range of the system and thus a Filling the pump chamber 9 during the suction stroke one in the pump chamber 9 axially movable pump piston 10 and a Backflow of fuel during the delivery stroke possible (see arrows in the bypass holes 26 (inlet) and 26b (process)).
  • control unit 4 Activation of the control unit 4 during the delivery stroke of the pump piston 10 closes this bypass. This leads to a pressure build-up in the high pressure area and after Exceeding the opening pressure of the injector 3 to Injecting fuel into the combustion chamber Internal combustion engine.
  • the closing time of the Control unit 4 thus determines the start of injection and the Closing time of the control unit 4 the injection quantity.
  • valve actuation unit 6 of the control unit 4 as a piezoelectric actuator designed.
  • the control valve 5 is designed as an inward opening I-valve, the has a valve body 11 which in the Flow direction acts on a valve seat 13 and that Control valve 5 closes.
  • the control valve 5 is shown in FIG Embodiment explained in more detail. For the same Components become corresponding reference symbols in FIG. 2 used.
  • the control valve 5 is connected to the valve actuation unit 6 in the drawing from above, ie in the direction of flow inwards.
  • the control valve 5 has a valve body 11 which is axially displaceably mounted in a housing 12 of the control unit 4. When the control valve 5 is closed, the valve body 11 is seated on the valve seat 13 from the inside in the flow direction.
  • the valve body 11 has a first guide element 14 which is in the flow direction and is axially displaceably mounted in the housing 12 and has a circular cross section.
  • the valve seat 13 has an arcuate course.
  • the diameter d 1 of the first guide element 14 is equal to the diameter d 3 of the valve seat 13. This results in two equally large surfaces 11a and 11b of the valve body (11) which are axially effective in the opposite direction.
  • the valve body 11 also has a flow direction external and axially displaceable in the housing 12 mounted second guide element 15 with one after internally directed axially effective surface 15a. Through the Surface 15a abruptly retracts the valve body 11 prevented when opening the control valve 5.
  • control valve 5 When the control valve 5 is open, it is in the flow direction outward axially effective surface of the Valve body 11 enlarged by an area that at closed control valve 5 through the valve seat 13 of shielded from the pressure applied to the valve body 11 is.
  • the control valve 5 When the control valve 5 is open, the adjacent one Pressure to an inward flow direction force acting on the valve body 11.
  • the second Guide element 15 has one around valve body 11 running inward in the direction of flow axially effective surface 15a on the open Control valve 5 the applied pressure acts and after externally directed force acting on the valve body 11 leads. Regardless of the size of the attached print the two forces almost equalize.
  • the housing 12 is constructed in two parts.
  • the first housing part 12a has a first axial bore 12c for receiving the first guide element 14 and a coaxial second bore 12d with a larger diameter into which the inlet (bypass bore 26a) from the Pump unit opens.
  • the second housing part 12b is as formed a socket into which a third bore 12e Recording of the second guide element 15 is introduced the end face of the inside of the flow direction
  • the second housing part 12b, the valve seat 13 is formed.
  • the second housing part 12b is at a distance from the floor the second bore 12d arranged in this.
  • the second Housing part 12b is pressed into the second bore 12d or shrunk.
  • a clearance of approximately 2 to 4 ⁇ 10 -6 m is formed between the first guide element 14 and the first bore 12c, and a clearance of approximately 8 to 10 ⁇ 10 -6 m is formed between the second guide element 15 and the third bore 12e , Due to the slight play between the first guide element 14 and the first bore 12c and the greater play between the second guide element 15 and the third bore 12e, an offset of the valve body 11 in the housing 12 can be kept as small as possible.
  • the valve body 11 is a by a compression spring formed spring element 16 which between the housing 12 and Valve body 11 is arranged when inactive Valve actuating element 6 in an open position of the valve seat 13 in the flow direction inwards pushed away. By activating the valve actuator 6 against the valve body 11 in a closed position pressed the valve seat 13.

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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)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Details Of Reciprocating Pumps (AREA)

Claims (12)

  1. Unité de commande (4) pour commander la montée en pression dans une unité de pompe (2) avec une soupape de commande (5) et une unité de commande de soupape (6) raccordée à celle-ci, la soupape de commande (5) étant formée comme une soupape en I s'ouvrant vers l'intérieur, dans le sens d'écoulement, et présentant un corps de soupape (11) installé de manière déplaçable axialement dans un boítier (12) de l'unité de commande (4), qui repose sur un siège de soupape (13) de la soupape de commande (5) lorsque la soupape de commande (5) est fermée depuis l'intérieur, une surface effective axialement formée du corps de soupape (11) de telle sorte que les forces qui agissent sur le corps de soupape (11) lorsque la soupape de commande (5) est fermée par la pression adjacente de l'unité de pompe (2) s'équilibrent mutuellement, et le corps de soupape (11) étant installé de manière déplaçable axialement dans le boítier (12) au moyen d'un premier élément de guidage (14), situé à l'intérieur, vu dans le sens d'écoulement,
    caractérisée en ce que
    le boítier (12) est construit en deux parties, la première partie de boítier (12a) présente un premier alésage axial (12c) pour loger le premier élément de guidage (14) et un deuxième alésage coaxial (12d) d'un diamètre supérieur, dans lequel débouche l'amenée de l'unité de pompe (2), et le siège de soupape (13) est formé sur un côté frontal de la deuxième partie de boítier (12b), dirigé dans l'intérieur vu dans le sens d'écoulement, et la deuxième partie de boítier (12b) est placé dans le deuxième alésage (12d)à à distance du fond de celui-ci.
  2. Unité de commande (4) selon la revendication 1,
    caractérisée en ce que
    le corps de soupape (11) présente une section circulaire, le siège de soupape (13) présente un tracé de forme circulaire et le diamètre extérieur du premier élément de guidage (14) est identique au diamètre extérieur du siège de soupape (13).
  3. Unité de commande (4) selon la revendication 2,
    caractérisée en ce que
    le corps de soupape (11) est installé de manière déplaçable axialement dans le boítier (12) au moyen d'un deuxième élément de guidage (15) situé à l'extérieur dans le sens d'écoulement.
  4. Unité de commande (4) selon la revendication 3,
    caractérisée en ce que
    le deuxième élément de guidage (15) présente une surface effective axialement formée de telle sorte que les forces qui agissent sur le corps de soupape (11) lorsque la soupape de commande (5) est fermée par la pression adjacente s'équilibrent quasi mutuellement.
  5. Unité de commande (4) selon l'une quelconque des revendications 1 à 4,
    caractérisée en ce que
    l'unité de commande de la soupape (6) est formée comme un acteur piézoélectrique.
  6. Unité de commande (4) selon l'une quelconque des revendications 1 à 5,
    caractérisée en ce que
    la deuxième partie de boítier (12b) est pressée ou contractée dans le deuxième alésage (12d).
  7. Unité de commande (4) selon l'une quelconque des revendications 1 à 6,
    caractérisée en ce que
    la deuxième partie de boítier (12b) est formée comme une douille qui présente un troisième alésage (12e) pour loger le deuxième élément de guidage (15).
  8. Unité de commande (4) selon la revendication 7,
    caractérisée en ce qu'
    un petit jeu est formé entre le premier élément de guidage (14) et le premier alésage (12c) et un jeu plus grand est formé entre le deuxième élément de guidage (15) et le troisième alésage (12e).
  9. Unité de commande (4) selon la revendication 8,
    caractérisée en ce qu'
    un jeu d'environ 2 à 4.10-6m est formé entre le premier élément de guidage (14) et le premier alésage (12c) et/ou un jeu d'environ 8 à 10.10-6 m est formé entre le deuxième élément de guidage (15) et le troisième alésage (12e).
  10. Système d'injection (1) pour amener du carburant dans une chambre de combustion d'un moteur à combustion interne à injection directe avec une unité de pompe (2) pour la montée en pression d'une pression d'injection puis pour injecter le carburant à l'aide d'un gicleur (3) dans la chambre de combustion,
    caractérisé en ce que
    le système d'injection (1) présente une unité de commande (4) selon l'une quelconque des revendications 1 à 9.
  11. Méthode de fabrication d'une unité de commande (4) selon l'une quelconque des revendications 3 à 9,
    caractérisée en ce qu'
    un corps de soupape (11) est formé avec un premier élément de guidage (14) situé à l'intérieur dans le sens d'écoulement et/un deuxième élément de guidage (15) situé à l'extérieur,
    un premier alésage (12c) pour loger le premier élément de guidage (14) et qu'un deuxième alésage coaxial (12d) d'un diamètre supérieur sont appliqués dans une première partie de boítier (12a),
    un troisième alésage (12e) pour loger le deuxième élément de guidage (15) est appliqué dans une deuxième partie de boítier (12b)
    un siège de soupape (13) est formé sur un côté frontal de la deuxième partie de boítier (12b) dirigé vers l'intérieur dans le sens d'écoulement,
    le corps de soupape (11) est emboíté avec le premier élément de guidage (14) dans le premier alésage (12c) et
    la deuxième partie de boítier (12b) est emboítée et fixée de telle sorte dans le deuxième alésage que le deuxième élément de (12d) guidage (15) est emboíté dans le troisième alésage (12e).
  12. Méthode selon la revendication 11,
    caractérisée en ce qu'
    un jeu d'environ 2 à 4.10-6m est prévu entre le premier élément de guidage (14) et le premier alésage (12c) et/ou qu'un jeu d'environ 8 à 10.10-6 m est prévu entre le deuxième élément de guidage (15) et le troisième alésage (12e).
EP99952405A 1998-08-18 1999-08-18 Unite de commande pour commander la montee en pression dans un ensemble pompe Expired - Lifetime EP1045976B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19837333 1998-08-18
DE19837333A DE19837333A1 (de) 1998-08-18 1998-08-18 Steuereinheit zur Steuerung des Druckaufbaus in einer Pumpeneinheit
PCT/DE1999/002553 WO2000011340A1 (fr) 1998-08-18 1999-08-18 Unite de commande pour commander la montee en pression dans un ensemble pompe

Publications (2)

Publication Number Publication Date
EP1045976A1 EP1045976A1 (fr) 2000-10-25
EP1045976B1 true EP1045976B1 (fr) 2004-05-12

Family

ID=7877841

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99952405A Expired - Lifetime EP1045976B1 (fr) 1998-08-18 1999-08-18 Unite de commande pour commander la montee en pression dans un ensemble pompe

Country Status (6)

Country Link
US (1) US6530556B1 (fr)
EP (1) EP1045976B1 (fr)
JP (1) JP2002523671A (fr)
KR (1) KR20010031171A (fr)
DE (2) DE19837333A1 (fr)
WO (1) WO2000011340A1 (fr)

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DE19939452C2 (de) * 1999-08-20 2003-04-17 Bosch Gmbh Robert Vorrichtung zur Einspritzung von Kraftstoff
DE10032923A1 (de) 2000-07-06 2002-01-24 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
US6726172B2 (en) * 2002-08-09 2004-04-27 Hoerber Kompressortechnik Services Gmbh Valve
US7240740B2 (en) * 2004-01-16 2007-07-10 Victaulic Company Diaphragm valve with pivoting closure member
DE102004015362A1 (de) 2004-03-30 2005-10-20 Bosch Gmbh Robert Pumpe-Düse-Einheit mit Magnetventil und Verfahren zur Montage des Magnetventils
DE102004024215A1 (de) * 2004-05-15 2005-12-08 L'orange Gmbh Steuerventil

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US4573659A (en) * 1984-03-05 1986-03-04 Lucas Industries Public Limited Company Fluid control valve
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DE4142998C1 (fr) * 1991-12-24 1993-07-22 Robert Bosch Gmbh, 7000 Stuttgart, De
EP0588475B1 (fr) * 1992-07-23 1996-04-03 Zexel Corporation Dispositif d'injection de combustible
DE4238727C2 (de) * 1992-11-17 2001-09-20 Bosch Gmbh Robert Magnetventil
BR9401368A (pt) * 1993-03-31 1994-11-01 Cummins Engine Co Inc Conjunto de válvula de três vias
DE4322546A1 (de) * 1993-07-07 1995-01-12 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
DE4323683A1 (de) * 1993-07-15 1995-01-19 Bosch Gmbh Robert Kraftstoffeinspritzpumpe
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US5641148A (en) * 1996-01-11 1997-06-24 Sturman Industries Solenoid operated pressure balanced valve
DE19716041C2 (de) * 1997-04-17 1999-11-04 Daimler Chrysler Ag Elektromagnetisch betätigbares Ventil

Also Published As

Publication number Publication date
EP1045976A1 (fr) 2000-10-25
JP2002523671A (ja) 2002-07-30
US6530556B1 (en) 2003-03-11
KR20010031171A (ko) 2001-04-16
WO2000011340A1 (fr) 2000-03-02
DE19837333A1 (de) 2000-02-24
DE59909469D1 (de) 2004-06-17

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