EP0752059B1 - Systeme d'injection de carburant - Google Patents

Systeme d'injection de carburant Download PDF

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Publication number
EP0752059B1
EP0752059B1 EP95913047A EP95913047A EP0752059B1 EP 0752059 B1 EP0752059 B1 EP 0752059B1 EP 95913047 A EP95913047 A EP 95913047A EP 95913047 A EP95913047 A EP 95913047A EP 0752059 B1 EP0752059 B1 EP 0752059B1
Authority
EP
European Patent Office
Prior art keywords
injection
piston
hole
fuel
distributor chamber
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
EP95913047A
Other languages
German (de)
English (en)
Other versions
EP0752059A1 (fr
Inventor
Wendelin KLÜGL
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0752059A1 publication Critical patent/EP0752059A1/fr
Application granted granted Critical
Publication of EP0752059B1 publication Critical patent/EP0752059B1/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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/023—Injectors structurally combined with fuel-injection pumps characterised by the pump drive mechanical
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/06—Pumps peculiar thereto
    • 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

Definitions

  • the invention relates to a fuel injection system for Vorund Main fuel injection through injectors the combustion chambers of an internal combustion engine after Preamble of claim 1.
  • Such an injection system is described in DE-OS 37 31 240 known.
  • a main injection piston provided that is slidable in an associated cylinder is stored.
  • a return spring is between the bottom of the Cylinder and a shoulder on the top of the main injection piston stored and tends to the main injection piston to keep in its rest position in which one of the Piston pressure chamber has its maximum volume.
  • An inlet channel for the fuel opens into the cylinder, an injection channel arranged at approximately the same height as well at the lower end of the cylinder a return line for the Fuel that can be closed by a solenoid valve.
  • This cylinder also has a pre-injection chamber a pre-injection piston movable therein, which a certain one when the main injection piston moves Amount of fuel through a channel that communicates with the injection channel communicates, releases for pre-injection.
  • the pre-injection chamber is still above a throttle bore with another piston connected by a another spring in the pre-injection in its upper position is held.
  • a further lowering the main injection piston Piston Piston lowered so that a certain volume the space of Piston between the throttle bore and the cylinder of the Fills the piston with fuel and when one is exceeded the main injection by the further spring predetermined pressure starts.
  • the figure shows a section of a pump-injector system with a pilot injection piston.
  • a housing 1 In a housing 1 is in in the position shown provided in the vertical direction extending pump chamber 2, in which a fuel inlet bore 3 and one the same height arranged filling hole 4 opens. Below of these two holes 3,4 opens another hole 5 in the pump chamber 2. This bore 5 or line is one Guided solenoid valve, not shown.
  • the hole 5 is with an inlet bore 6 in connection, which in a distribution chamber 7 flows into the drawing on the right.
  • the filling hole 4 opens into the distribution chamber 7 on the left.
  • the distribution chamber 7 is left by a screw 8 and closed a sealing ring 9.
  • a pilot injection piston 10 In the distribution chamber 7 rests on the right a pilot injection piston 10, which is in the by a Distribution chamber 10 arranged compression spring 11 in the shown Position is pressed.
  • the pre-injection piston 10 has one center hole open on one side in the direction of the compression spring 11 12 with which a radially extending injection bore 13 and a bore 14 is connected.
  • the Injection bore 13 is arranged in housing 1 Inlet 15 of an injection nozzle (not shown) and the bore 14 an inlet 16 to a nozzle spring prestressing piston 23 facing.
  • the nozzle spring biasing piston 23 is one Nozzle spring 18 pressed against the drawn upper stop.
  • a delivery piston 17 is provided by a Cam, not shown, is axially displaceable and by a spring, not shown, is biased upwards.
  • the injection system works as follows: In the shown Position, the normal fuel pressure is above the fuel inlet hole 3, the pump chamber 2 and the filling hole 4 in the distribution chamber 7 and via the central bore 12 the injection bore 13 and the bore 14.
  • the injector is closed in this state.
  • the pre-injection piston 10 is due to the compression spring 11 in his right position, at the hole 5 and the inlet hole 6 the pressure of the fuel is also present.
  • the Solenoid valve is open at this time, so the fuel flows through this solenoid valve.
  • the control piston 17 by a cam down driven the fuel supply would be interrupted, however, the pilot injection piston 10 would not be driven will.
  • the injection process is now done by closing the solenoid valve initiated. It is assumed that the delivery piston 17th is moving down at this time. The Filling hole 4 and the fuel inlet hole 3 through the Delivery piston 17 closed, the pressure in the distribution chamber 7 initially remains constant. Another movement of the Delivery piston 17, however, has an increased pressure in the further bore 5 and the inlet bore 6 result, so that the pre-injection piston 10 against the force of the compression spring 11 is moved to the left. This increases the pressure in the distribution chamber 7, so that from a certain pressure, the is specific to an injection valve, a pre-injection via the injection bore 13 and the inlet 15 on the nozzle he follows. The inlet 16 is also open, but has initially due to the bias of the nozzle spring mentioned above 18 no additional preload on the nozzle spring 18.
  • the distributor piston 10 moves further to the left.
  • the Pre-injection is now interrupted because the edge 25 den Inlet 15 to the nozzle interrupts.
  • the nozzle closes briefly.
  • the pressure in the bore 6 and in the distribution chamber 7 meanwhile continues to rise.
  • the pilot injection piston 10 is moved further to the left and once the pressure in the Distributor chamber 7 is sufficient, the nozzle spring biasing piston 23 to move downwards, this dodges and tensions the Nozzle spring 18 in addition, what for the main injection a desired increased opening pressure of the not shown Nozzle.
  • the main injection can begin as soon as the edge 26 of the pre-injection piston 10 closes the inlet 15 releases.
  • the pre-injection bore 13 and the bore 14 in the injection piston 10 can be manufactured exactly, which is reproducible Ratios in the pre and main injection results. Furthermore, the bore 14 can be made as a throttle bore are moved to the nozzle spring biasing piston 23 defined to be able to. The size of the pre-injection quantity and the distance of pre and main injection are exactly due to the location of the Edges 25 and 26 for the nozzle inlet bore 15 can be determined.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (4)

  1. Système d'injection de carburant pour la pré-injection et l'injection principale de carburant par l'intermédiaire de gicleurs d'injection dans des chambres de combustion d'un moteur à combustion interne, comportant
    un piston (17) d'alimentation qui est monté dans un corps (1) de pompe et qui peut être commandé par un dispositif à cames,
    un trou (3) d'alimentation en carburant débouchant dans une zone (2) de piston du piston (17) d'alimentation,
    un trou (4) de remplissage qui débouche à peu près au même niveau dans la zone (2) de piston et qui débouche dans une chambre (7) de répartition,
    un trou (5, 6) d'alimentation qui est ménagé entre la zone (2) de piston et la chambre (7) de répartition et qui est en liaison avec une électrovanne,
    comportant un piston (10) de pré-injection oblong monté coulissant dans la direction longitudinale dans la chambre (7) de répartition,
    comportant un ressort (11) de pression, qui est monté dans la partie de la chambre (7) de répartition communiquant avec le trou (4) de remplissage, qui agit sur un côté du piston (10) de pré-injection et qui le repousse à une position de départ de l'autre côté,
    comportant un trou (12) d'alimentation ménagé dans le piston (10) de pré-injection, ouvert d'un côté en direction du ressort (11) de pression,
       caractérisé en ce qu'un trou (14) part du trou (12) d'alimentation en direction d'un piston (23) de précontrainte monté dans le corps (1) de pompe et soumis à la force d'un ressort (18) de précontrainte, et en ce qu'un trou (13) supplémentaire, qui peut communiquer avec une arrivée (15) de soupape d'injection et qui est à distance du trou (14), part du trou (12) d'alimentation, et en ce qu'il est prévu des rainures (19, 20) annulaires dans la zone des trous (13, 14) à la périphérie du piston (10) de pré-injection.
  2. Système d'injection suivant la revendication 1, caractérisé en ce que le trou (12) d'alimentation du piston (10) de pré-injection est formé par un trou (12) situé au milieu.
  3. Système d'injection suivant la revendication 1, caractérisé en ce que les trous (13, 14) débouchent à peu près au milieu des rainures (19, 20) annulaires.
  4. Système d'injection suivant la revendication 1, caractérisé en ce que le piston (10) de pré-injection est monté dans la chambre (7) de répartition, de manière à pouvoir glisser au moins à son extrémité avant et à son extrémité arrière.
EP95913047A 1994-03-25 1995-03-23 Systeme d'injection de carburant Expired - Lifetime EP0752059B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4410458 1994-03-25
DE4410458 1994-03-25
PCT/DE1995/000400 WO1995026468A1 (fr) 1994-03-25 1995-03-23 Systeme d'injection de carburant

Publications (2)

Publication Number Publication Date
EP0752059A1 EP0752059A1 (fr) 1997-01-08
EP0752059B1 true EP0752059B1 (fr) 1998-08-12

Family

ID=6513884

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95913047A Expired - Lifetime EP0752059B1 (fr) 1994-03-25 1995-03-23 Systeme d'injection de carburant

Country Status (3)

Country Link
EP (1) EP0752059B1 (fr)
DE (1) DE59503169D1 (fr)
WO (1) WO1995026468A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10354919A1 (de) * 2003-11-25 2005-06-30 Motorenfabrik Hatz Gmbh & Co. Kg Elektromagnetisch gesteuerte Aufschalteinheit für nockenbetätigte Einspritzanlage einer Brennkraftmaschine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE941703C (de) * 1953-06-13 1956-04-19 Kugelfischer G Schaefer & Co Einspritzpumpe fuer Einspritzbrennkraftmaschinen
DE3731240C2 (de) * 1987-09-17 1995-04-06 Volkswagen Ag Einspritzvorrichtung
DE4018535C2 (de) * 1990-06-09 1995-03-09 Orange Gmbh Kraftstoffeinspritzvorrichtung

Also Published As

Publication number Publication date
WO1995026468A1 (fr) 1995-10-05
DE59503169D1 (de) 1998-09-17
EP0752059A1 (fr) 1997-01-08

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