EP0418800B1 - Dispositif d'injection de combustible pour un moteur à combustion interne - Google Patents

Dispositif d'injection de combustible pour un moteur à combustion interne Download PDF

Info

Publication number
EP0418800B1
EP0418800B1 EP90117905A EP90117905A EP0418800B1 EP 0418800 B1 EP0418800 B1 EP 0418800B1 EP 90117905 A EP90117905 A EP 90117905A EP 90117905 A EP90117905 A EP 90117905A EP 0418800 B1 EP0418800 B1 EP 0418800B1
Authority
EP
European Patent Office
Prior art keywords
injection
main
pump
piston
line
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
EP90117905A
Other languages
German (de)
English (en)
Other versions
EP0418800A2 (fr
EP0418800A3 (en
Inventor
Helmut Nieth
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.)
LOrange GmbH
Original Assignee
LOrange 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 LOrange GmbH filed Critical LOrange GmbH
Publication of EP0418800A2 publication Critical patent/EP0418800A2/fr
Publication of EP0418800A3 publication Critical patent/EP0418800A3/de
Application granted granted Critical
Publication of EP0418800B1 publication Critical patent/EP0418800B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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
    • F02M59/44—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
    • F02M59/462—Delivery valves

Definitions

  • the invention relates to a fuel injection device for an internal combustion engine with an injection pump for delivering a main injection quantity via a main injection line and with a pre-injection piston chamber coupled to a pre-injection line, in which a pre-injection piston operated hydraulically by the injection pump against a spring force works.
  • a fuel injection device in which an ignitable main fuel, for example alcohol in a main injection and another ignition fuel is supplied in a pre-injection of the internal combustion engine.
  • Two separate fuel supply lines in particular two fuel tanks and two fuel pumps, are required to operate the internal combustion engine.
  • the pre-injection takes place in that the pressure impressed on the unwanted fuel in the injection pump moves the pre-injection piston against its spring force, so that the pre-injection line and a nozzle are conveyed into a combustion chamber of the internal combustion engine.
  • the main disadvantage of this arrangement is too see that a separate feed pump is required for filling the pre-injection piston chamber.
  • a further fuel injection device for an internal combustion engine with an injection pump for delivering a main injection quantity via a main injection line and with a pre-injection piston chamber coupled to a pre-injection line, in which a pre-injection piston operated hydraulically by the injection pump against a spring force works.
  • a main valve is formed by the pre-injection piston, which is mounted coaxially and slidably in a storage piston that determines the start of the main injection.
  • the geometry and spring force of the pre-injection piston are matched so that the pre-injection quantity is delivered before the main valve opens.
  • This arrangement also uses a separate low-pressure feed pump to deliver the pre-injection quantity into the pre-injection piston chamber.
  • a major advantage of the device according to the invention is that the fuel supply to the pre-injection piston chamber is provided in a simple manner via the connecting channel from the fuel volume in the main injection line when the main valve is closed after the main injection has ended. This advantageously eliminates the need for a separate low-pressure feed pump for the pre-injection quantity of the fuel, because the The pre-injection piston chamber is filled using the amount of fuel in the main injection line.
  • a pressure line is provided from the pump chamber of the injection pump to the end face of the pre-injection piston on the pump chamber side.
  • This end face is preferably larger than the effective cross section of the pressure line.
  • the length of the pre-injection line and the main injection line are preferably matched to one another in order to achieve a desired spread between the pre-injection and the main injection.
  • Another advantageous embodiment of the invention provides that the opening pressures of the pre-injection valve and the main injection valve are matched to one another in order to achieve a desired spread between the pre-injection and the main injection.
  • Another advantage is that the injection pump, the main pressure valve and the pre-injection piston chamber form a compact structural unit.
  • the number and size of the devices to be attached to the motor can thus be minimized as far as possible.
  • FIG. 1 schematically shows the fuel injection device 1, which essentially consists of an injection pump 2 and an injection quantity distribution head 3 flanged onto it.
  • a pre-injection line 6 branches off from the injection distributor head 3, which in turn is coupled to a pre-injection valve 7.
  • the injection pump 2 shows the fuel injection device 1 consisting of the injection pump 2 and the injection distributor head 3 mounted therein in a schematic longitudinal section.
  • the injection pump 2 consists of a pump housing 8 in which a piston guide 9 is fitted. Between the pump housing 8 and the piston guide 9, an annular suction space 10 is let in, which communicates with a fuel reservoir, not shown.
  • the piston guide 9 has a central pump chamber 11, in which a pump piston 12 can be moved in an oscillating manner. The pump piston 12 is moved in an oscillating manner via cam kinematics (not shown).
  • the pump chamber 11 is connected to the suction chamber 10 via control bores 13, fuel being sucked out of the suction chamber 10 into the pump chamber 11 via the control bores 13 when the pump piston 12 moves downward.
  • the pump piston 12 has control edges 14 and 15, by means of which the start and end of the pressure stroke can be controlled in a known manner.
  • the pump piston 12 can be rotated in the circumferential direction by a certain angle in a known manner.
  • the pump chamber 11 is connected via a main bore 16 to a main injection line 4, a main valve 18 being provided between the main bore 16 and the main injection line 4, which has a lock cylinder 19 which is pressed by a compression spring 20 against an annular sealing shoulder 21 to close the main bore 16 is.
  • a pre-injection piston chamber 22 is also provided, which is closed off from the pressure pump chamber 11 by the pre-injection piston 23.
  • the pre-injection piston 23 is pressed against a second sealing shoulder 25 via the compression spring 24.
  • the pressure line 26 connected to the pump chamber 11 has a smaller diameter and thus a smaller area than the end face of the pre-injection piston 23.
  • the pre-injection piston chamber 22 is also connected on the one hand to a pre-injection line 6, which, as can be seen from FIG. 1, is coupled to the pre-injection valve 7.
  • the pre-injection piston chamber 22 is connected to the main injection line 4 via the connecting channel 27.
  • the pump chamber 11 is also connected via an overpressure bore 28 to an overpressure valve 29 connected anti-parallel to the main valve 18, the pressure side of the overpressure valve 29 communicating with the main injection line 4 by means of the line 30.
  • the mode of operation of the fuel injection device according to the invention is as follows:
  • the pump piston 12 is - as shown in FIG. 2 - at its bottom dead center.
  • the filling process of fuel from the suction chamber 10 via the control bores 13 into the pump chamber 11 is complete, ie it is filled with fuel.
  • the pump piston 12 then moves back into the pump chamber 11, with no pressure building up in the pump chamber 11 until the front control edge 14 of the pump piston 12 has closed the control bores 13. Up to this point, part of the fuel flows back into the suction chamber 10.
  • the locking cylinder 19 of the main valve 18 and the pre-injection piston 23 are meanwhile held in their lower end position by the common stand pressure in the injection lines 4 and 6 and by the spring force of the compression springs 20 and 24, the locking cylinder 19 facing the main bore 16 along the sealing shoulder 21 Main injection line 4 seals.
  • the pressure in the pump chamber required to open the pre-injection piston 23 only acts on the area formed by the sealing cross-section of the pressure line 26 and must therefore be greater than the standing pressure of the injection lines 4 and 6, which acts on the larger area of the sealing shoulder 25 and additionally by the force of the Compression spring 24 is supported.
  • the pre-injection piston 23 jumps up and generates a pressure wave that propagates via the pre-injection line 6 to the pre-injection valve 7.
  • the pre-injection piston 23 moves against the force of the compression spring 24, displacing the fuel located in the pre-injection piston chamber 22, primarily into the pre-injection line 6 until its annular sealing flange 31 bears against the sealing surface 32 of the injection distributor head 3.
  • the connecting channel 27 is closed, so that the pre-injection line 6 is sealed off from the main injection line 4.
  • the fuel quantity of the pre-injection is determined by the stroke of the pre-injection piston 23.
  • the amount of fuel in the pump chamber 11 does not yet have a drain option at the time of the pre-injection, so that the pressure in the pump chamber 11 builds up even further. This continues until the delivery pressure also overcomes the counterforces at the lock cylinder 19 from stand pressure in the main injection line 4 and spring force of the compression spring 20.
  • the lock cylinder 19 then moves upwards to its upper stop 33 and the main injection quantity is delivered from the pump chamber 11 via the main bore 16 and a channel system 34 in the interior of the lock cylinder to the main injection line 4, from which the injection takes place via the main injection valve 5.
  • the main injection takes place after completion of the pre-injection and upward movement of the lock cylinder 19 until the rear control edge 15 of the pump piston 12 connects the pump chamber 11 to the control bore 13 again, so that the remaining fuel escapes into the suction chamber 10 again.
  • the pressure difference between the pump chamber 11 and the main injection line 4 can be set by the pressure relief valve 29 installed antiparallel to the main valve 18. After a certain pressure drop through the opening of the control bores 13, the lock cylinder 19 moves downward and seals the main injection line 4 against the pump chamber 11 on the sealing shoulder 21. Until the stand pressure in the injection lines 4 and 6 has set, the pilot injection piston 23 has returned to its lower end position due to the force of the compression spring 24 and the pressure difference between the injection lines 4 and 6 and the pump chamber 11.
  • the pre-injection piston chamber 22 fills with fuel that flows from the main injection line 4 into the pre-injection piston chamber 22 via the connecting channel 27. In parallel, fuel flows from the main injection line 4 until the set stand pressure at the pressure relief valve 29 is reached via the pressure relief hole 28 back into the pump chamber 11. When the pump piston 12 passes its top dead center, the suction stroke begins. The pump chamber 11 fills with fuel from the suction chamber 10, provided the control bores 13 are not exactly closed by the pump piston 12. After passing through the bottom dead center by the pump piston 12, the fuel injection device 1 is ready for a new injection process.

Landscapes

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

Claims (8)

  1. Dispositif d'injection de combustible pour un moteur à combustion interne, comprenant une pompe d'injection pour refouler un volume d'injection principale par l'intermédiaire d'une conduite (4) d'injection principale, comprenant une chambre (22) de piston de préinjection qui est reliée à une conduite de préinjection (6) et dans laquelle évolue un piston de préinjection (23) sollicité hydrauliquement par la pompe d'injection à l'encontre d'une force élastique, et comprenant une valve principale (18) implantée entre la pompe d'injection (2) et une conduite (4) d'injection principale, la géométrie et la force élastique du piston de préinjection (23) étant calculées de façon que le volume de préinjection soit admis avant l'ouverture de la valve principale (18), caractérisé en ce que la conduite (4) d'injection principale communique avec la chambre (22) du piston de préinjection par un canal de liaison (27), et en ce que, à l'issue de la préinjection, le piston de préinjection (23) ferme le canal de liaison (27) situé entre la conduite (4) d'injection principale et la chambre (22) du piston de préinjection.
  2. Dispositif d'injection de combustible selon la revendication 1, caractérisé en ce qu'une conduite de pression (26) mène de la chambre de pompe (11) de la pompe d'injection (2) à la surface frontale, côté chambre de pompe, du piston de préinjection (23).
  3. Dispositif d'injection de combustible selon la revendication 2, caractérisé en ce que la surface frontale, côté chambre de pompe, du piston de préinjection (23) est plus grande que la section transversale utile de la conduite de pression (26).
  4. Dispositif d'injection de combustible selon l'une des revendications précédentes, caractérisé en ce que la longueur de la conduite de préinjection (6) et celle de la conduite (4) d'injection principale sont adaptées l'une à l'autre pour ménager une plage souhaitée entre la préinjection et l'injection principale.
  5. Dispositif d'injection de combustible selon l'une des revendications précédentes, caractérisé en ce que la pression d'ouverture de la valve de préinjection (7) et celle de la valve (5) d'injection principale sont adaptées l'une à l'autre pour ménager une plage souhaitée entre la préinjection et l'injection principale.
  6. Dispositif d'injection de combustible selon la revendication 1, caractérisé en ce qu'il est prévu une valve de surpression (29) montée en opposition à la valve principale (18).
  7. Dispositif d'injection de combustible selon l'une des revendications précédentes, caractérisé en ce que la valve principale (18) comporte un cylindre de fermeture (19) à sollicitation élastique qui, à l'état passant, obture le canal de liaison (27).
  8. Dispositif d'injection de combustible selon l'une des revendications précédentes, caractérisé en ce que la pompe d'injection (2), la valve principale (18) et la chambre (22) du piston de préinjection forment une unité structurelle compacte.
EP90117905A 1989-09-20 1990-09-18 Dispositif d'injection de combustible pour un moteur à combustion interne Expired - Lifetime EP0418800B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3931338A DE3931338A1 (de) 1989-09-20 1989-09-20 Brennstoffeinspritzvorrichtung fuer eine brennkraftmaschine
DE3931338 1989-09-20

Publications (3)

Publication Number Publication Date
EP0418800A2 EP0418800A2 (fr) 1991-03-27
EP0418800A3 EP0418800A3 (en) 1991-10-09
EP0418800B1 true EP0418800B1 (fr) 1993-10-20

Family

ID=6389782

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90117905A Expired - Lifetime EP0418800B1 (fr) 1989-09-20 1990-09-18 Dispositif d'injection de combustible pour un moteur à combustion interne

Country Status (2)

Country Link
EP (1) EP0418800B1 (fr)
DE (2) DE3931338A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9302566D0 (en) * 1993-02-10 1993-03-24 Lucas Ind Plc Valve
GB9615663D0 (en) * 1996-07-25 1996-09-04 Lucas Ind Plc Fuel pumping apparatus
US5873527A (en) * 1997-02-19 1999-02-23 Caterpillar Inc. Fuel injector with regulated plunger motion
DE102014002002B4 (de) * 2014-02-17 2016-10-06 L'orange Gmbh Einspritzsystem, insbesondere Pumpe-Leitung -Düse-Einspritzsystem, und Einspritzanlage

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3334619A1 (de) * 1983-09-24 1985-04-11 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzeinrichtung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3629751C2 (de) * 1986-09-01 1998-07-02 Bosch Gmbh Robert Voreinspritzvorrichtung für Brennkraftmaschinen
DE3731240C2 (de) * 1987-09-17 1995-04-06 Volkswagen Ag Einspritzvorrichtung
DE3732003A1 (de) * 1987-09-23 1989-04-06 Dahlmann Gerd Uwe Einspritzvorrichtung
FI80327C (fi) * 1988-05-16 1990-05-10 Waertsilae Oy Ab Foerdelnings- och styrventil foer braensleinsprutningspump.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3334619A1 (de) * 1983-09-24 1985-04-11 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzeinrichtung

Also Published As

Publication number Publication date
EP0418800A2 (fr) 1991-03-27
EP0418800A3 (en) 1991-10-09
DE3931338A1 (de) 1991-03-28
DE59003143D1 (de) 1993-11-25

Similar Documents

Publication Publication Date Title
EP0141044B1 (fr) Dispositif d'injection de carburant avec pré-injection et injection principale dans un moteur à combustion interne
DE2558699C2 (de) Pumpedüse für die Kraftstoffeinspritzung in eine Brennkraftmaschine
DE3048347C2 (fr)
DE2834633C2 (de) Vorrichtung zur Steuerung der Kraftstoffvoreinspritzung durch Zwischenentlastung bei einer Kraftstoffeinspritzanlage für eine Brennkraftmaschine
DE2602280A1 (de) Hochdruck-kraftstoffeinspritzeinrichtung fuer dieselmotoren
EP0133470B1 (fr) Injecteur de carburant pour moteurs à combustion interne
DE2755222A1 (de) Kraftstoffeinspritzeinrichtung, insbesondere fuer dieselbrennkraftmaschinen
DE2353737A1 (de) Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
EP0688950B1 (fr) Système d'injection de carburant
DE19860672A1 (de) Kolbenpumpe zur Kraftstoffhochdruckerzeugung
EP0064146B1 (fr) Système d'injection pour injecter deux combustibles par une seule buse d'injection
CH669015A5 (de) Einrichtung zum wahlweisen einspritzen von dieseloel und zuendoel in den brennraum einer mit dieseloel oder mit gas als hauptbrennstoff betriebenen hubkolbenbrennkraftmaschine.
DE3712310A1 (de) In einer kraftstoffeinspritzvorrichtung fuer eine brennkraftmaschine verwendetes kraftstoffeinspritzventil
CH671809A5 (fr)
DE10139055A1 (de) Verfahren, Computerprogramm, Steuer- und/oder Regelgerät sowie Kraftstoffsystem für eine Brennkraftmaschine
EP0418800B1 (fr) Dispositif d'injection de combustible pour un moteur à combustion interne
DE2656276A1 (de) Einspritzsystem fuer selbstzuendende brennkraftmaschinen
DE2258309C2 (de) Kraftstoffverteilereinspritzpumpe für Brennkraftmaschinen
DE1751080B1 (de) Kraftstoffeinspritzduese fuer Dieselmotoren
DE3236828A1 (de) Brennstoffeinspritzvorrichtung
DE3909750C2 (fr)
DE3535005A1 (de) Einspritzgeraet fuer eine brennkraftmaschine
DE2449332C2 (de) Kraftstoffverteilereinspritzpumpe für Brennkraftmaschinen
DE4425339C2 (de) Einspritzsystem
EP0713002B1 (fr) Pompe à combustible haute pression pour moteurs à combustion interne

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): CH DE FR GB IT LI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): CH DE FR GB IT LI

17P Request for examination filed

Effective date: 19911102

17Q First examination report despatched

Effective date: 19920416

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

ITF It: translation for a ep patent filed
AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR GB IT LI

ET Fr: translation filed
REF Corresponds to:

Ref document number: 59003143

Country of ref document: DE

Date of ref document: 19931125

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19940118

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20020909

Year of fee payment: 13

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040528

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20060914

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20060921

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20060926

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20060930

Year of fee payment: 17

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20070918

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070930

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080401

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070918

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070918