EP0142631B1 - Dispositif d'injection de combustible à pré-injection et injection principale définies pour moteur à combustion interne - Google Patents
Dispositif d'injection de combustible à pré-injection et injection principale définies pour moteur à combustion interne Download PDFInfo
- Publication number
- EP0142631B1 EP0142631B1 EP84109736A EP84109736A EP0142631B1 EP 0142631 B1 EP0142631 B1 EP 0142631B1 EP 84109736 A EP84109736 A EP 84109736A EP 84109736 A EP84109736 A EP 84109736A EP 0142631 B1 EP0142631 B1 EP 0142631B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- injection
- pressure
- preinjection
- pump
- 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
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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
- 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
Definitions
- a known fuel injection device of this type (DE-A-3 002 851) comprises, however for the exclusive application, on the one hand willing ignition, promoted by a high pressure injection pump and on the other hand by one to supply separate low-pressure delivery pump-delivered ignition fuel via a hydraulic auxiliary pump to separate injection nozzles for the main fuel and the ignition fuel in a diesel engine, a piston slidably mounted in a bore of the auxiliary pump.
- the piston is spring-biased (cf. FIG.
- a device for pre-injection, which has a separate small piston in axially parallel displacement to a loading piston for the main injection within a fuel injection valve.
- a separate low pressure supply is not provided in this known device; the pre-injection quantity is obtained from the fuel supply for the main injection.
- the stand pressure in the pressure line and thus the accuracy of the quantity control is adversely affected.
- a one-piece control slide which can be displaced against the force of a spring, is provided, which with significant intermediate relief in a memory via control edges provides the respective desired connections for and main injection.
- the fuel for the pre-injection is branched off from the delivery quantity of the injection pump which also supplies the main injection quantity, so that the accuracy of the quantity control for the main injection quantity is also negatively influenced.
- FIG. 1 shows a rough schematic representation of the basic embodiment of an auxiliary pump according to the invention with associated high-pressure and low-pressure feed pumps in an overall view
- FIG. 2 shows the time course of the various strokes and injection processes as they are realized by the auxiliary pump according to the invention
- plotted in the form 3 shows a detailed illustration of a cross section of the auxiliary pump according to the invention in box form and separately from the injection valves
- FIG. 3a shows an enlarged partial sectional illustration of the area of the pilot injection piston control groove
- FIG. 4 shows FIGS. 4a, 4b, 4c and 4d shows a further exemplary embodiment of the invention with an auxiliary pump integrated in a double needle nozzle holder in longitudinal section and in different cross sections.
- the accumulator piston 22a is slidably mounted and pressed into the starting position shown in the drawing by means of a preload spring 25.
- the bias spring 25 is supported on the shoulder 26 formed by the gradation of the bore 24.
- the diameter of the accumulator piston 22a is noticeably larger than the diameter of the pre-injection piston 23 and, in the exemplary embodiment shown, is at least twice as large, so that a desired transmission ratio with regard to the injection pressures and the fuel quantities displaced or absorbed at the same displacement units results.
- the pressure transmission ratios and the spring preload in the area of the hydraulic auxiliary pump 14 are dimensioned such that, when the delivery pressure of the high-pressure injection pump 13 acts, the accumulator piston 22a first performs a movement directed towards the pre-injection nozzle 21 and absorbs correspondingly delivered fuel quantities without the main injection nozzle 20 being associated with it Combustion chambers or inlet channels supplies fuel under high pressure, ie opens, the following mode of operation results, which is explained on the basis of the diagram in FIG.
- the set screw 37 is screwed into a thread of a bore 39 of the connecting piece 34 which is closed by a screwed plug 38 and feeds the fuel delivered by the high pressure injection pump to the pressure side of the working or storage piston 22a 'via a longitudinal channel 17a'; the fuel delivered reaches the pressure outlet 36 leading to the main injection nozzle via an annular groove 40 in the adjusting screw 37.
- the differential piston 22 ' can generally be supported by means of a stepped bore in a main body 41 comprising the hydraulic auxiliary pump 14'.
- the main body 41 connected to the extension 34 has a continuously cylindrical inner bore 42 which receives tubular inserts which serve to support and guide the differential piston 22 'and to form the inflow and outflow channels.
- the fuel for the pre-injection passes from the low-pressure connection 64 to a first ring channel 90 in the insert 66, which of course can also be formed by the ring part 79 and from there via “outer” channels 91 in or on the insert 66 and channels 92 in or on the insert 74 in Auxiliary pump area up to a second ring channel 93, which is connected via a transverse channel 94 to a working chamber 95 located upstream of the pre-injection piston 82.
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)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT84109736T ATE50027T1 (de) | 1983-08-26 | 1984-08-16 | Kraftstoffeinspritzeinrichtung zur definierten vor- und haupteinspritzung bei brennkraftmaschinen. |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3330773 | 1983-08-26 | ||
DE3330773 | 1983-08-26 | ||
DE3425460A DE3425460A1 (de) | 1983-08-26 | 1984-07-11 | Kraftstoffeinspritzeinrichtung zur definierten vor- und haupteinspritzung bei brennkraftmaschinen |
DE3425460 | 1984-07-11 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0142631A2 EP0142631A2 (fr) | 1985-05-29 |
EP0142631A3 EP0142631A3 (en) | 1987-05-27 |
EP0142631B1 true EP0142631B1 (fr) | 1990-01-31 |
Family
ID=25813491
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84109736A Expired - Lifetime EP0142631B1 (fr) | 1983-08-26 | 1984-08-16 | Dispositif d'injection de combustible à pré-injection et injection principale définies pour moteur à combustion interne |
Country Status (3)
Country | Link |
---|---|
US (1) | US4590903A (fr) |
EP (1) | EP0142631B1 (fr) |
DE (2) | DE3425460A1 (fr) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3516537A1 (de) * | 1985-05-08 | 1986-11-13 | M A N Nutzfahrzeuge GmbH, 8000 München | Kraftstoffeinspritzvorrichtung fuer selbstzuendende brennkraftmaschinen |
US4693227A (en) * | 1985-05-21 | 1987-09-15 | Toyota Jidosha Kabushiki Kaisha | Multi-fuel injection system for an internal combustion engine |
JPS61272461A (ja) * | 1985-05-29 | 1986-12-02 | Toyota Motor Corp | 内燃機関の燃料噴射弁 |
GB8612020D0 (en) * | 1986-05-16 | 1986-06-25 | Shell Int Research | Misfuelling prevention device |
DE3629751C2 (de) * | 1986-09-01 | 1998-07-02 | Bosch Gmbh Robert | Voreinspritzvorrichtung für Brennkraftmaschinen |
CH672661A5 (fr) * | 1987-03-17 | 1989-12-15 | Sulzer Ag | |
CH672660A5 (fr) * | 1987-03-17 | 1989-12-15 | Sulzer Ag | |
DE3907766A1 (de) * | 1989-03-10 | 1990-09-13 | Bosch Gmbh Robert | Speicherkraftstoffeinspritzvorrichtung |
EP0610585B1 (fr) * | 1993-02-09 | 1996-09-04 | Steyr Nutzfahrzeuge Ag | Dispositif d'injection de combustible à pré-injection et injection principale |
JP2885076B2 (ja) * | 1994-07-08 | 1999-04-19 | 三菱自動車工業株式会社 | 蓄圧式燃料噴射装置 |
ATE191064T1 (de) * | 1995-04-28 | 2000-04-15 | Ficht Gmbh & Co Kg | Kraftstoff-einspritzvorrichtung für brennkraftmaschinen |
US6378487B1 (en) | 2000-09-01 | 2002-04-30 | International Truck And Engine Corporation | Method and apparatus for pre-pilot fuel injection in diesel internal combustion engines |
DE10123911A1 (de) * | 2001-05-17 | 2002-11-28 | Bosch Gmbh Robert | Kraftstoffeinspritzeinrichtung mit Druckübersetzungseinrichtung und Druckübersetzungseinrichtung |
WO2005078271A1 (fr) * | 2004-02-11 | 2005-08-25 | Mazrek Ltd | Mecanisme d'actionnement destine a une pompe-injecteur a entrainement hydraulique pour moteurs thermiques |
US7267108B2 (en) * | 2005-04-18 | 2007-09-11 | Ford Global Technologies, Llc | Fuel system pressure relief valve with integral accumulator |
DE102008003347A1 (de) * | 2008-01-07 | 2009-07-09 | Robert Bosch Gmbh | Druckverstärkeranordnung |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE596917C (de) * | 1932-10-08 | 1934-11-15 | Walter Herrmann Dipl Ing | Einspritzvorrichtung fuer Brennkraftmaschinen |
US2537087A (en) * | 1942-03-07 | 1951-01-09 | Atlas Diesel Ab | Fuel injection apparatus |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2173814A (en) * | 1938-03-15 | 1939-09-19 | Bischof Bernhard | Fuel injection apparatus for internal combustion engines |
DE870619C (de) * | 1951-05-11 | 1953-03-16 | Kloeckner Humboldt Deutz Ag | Vorrichtung an Dieselmaschinen |
GB728697A (en) * | 1952-12-18 | 1955-04-27 | George Wilfrid Acland Green | Improvements relating to fuel injection systems for internal combustion engines |
GB810456A (en) * | 1954-10-06 | 1959-03-18 | British Internal Combust Eng | Improvements in or relating to liquid fuel injection systems for internal combustion engines |
AT276866B (de) * | 1965-12-31 | 1969-12-10 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Vor- und Haupteinspritzung |
FR1515388A (fr) * | 1966-03-30 | 1968-03-01 | Bosch Gmbh Robert | Soupape d'injection de carburant pour la pré-injection et l'injection principale |
DE1284687B (de) * | 1967-10-18 | 1968-12-05 | Bosch Gmbh Robert | Kraftstoffeinspritzventil fuer Vor- und Haupteinspritzung |
DE1914742A1 (de) * | 1969-03-22 | 1970-10-01 | Maschf Augsburg Nuernberg Ag | Brennstoffeinspritzduese fuer Brennkraftmaschinen |
GB2016588B (en) * | 1978-03-21 | 1982-08-11 | Lucas Industries Ltd | Fuel system for a multi-cylinder engine |
DE2834633C2 (de) * | 1978-08-08 | 1987-05-14 | Robert Bosch Gmbh, 7000 Stuttgart | Vorrichtung zur Steuerung der Kraftstoffvoreinspritzung durch Zwischenentlastung bei einer Kraftstoffeinspritzanlage für eine Brennkraftmaschine |
DE2911447A1 (de) * | 1979-03-23 | 1980-09-25 | Daimler Benz Ag | Den kraftstoffdurchfluss steuerndes steuerglied fuer einspritzvorrichtungen bei insbesondere luftverdichtenden brennkraftmaschinen |
DE2943896A1 (de) * | 1979-10-31 | 1981-05-14 | Robert Bosch Gmbh, 7000 Stuttgart | Kraftstoffeinspritzduese fuer brennkraftmaschinen |
DE3002851A1 (de) * | 1980-01-26 | 1981-07-30 | Motoren-Werke Mannheim AG, vorm. Benz Abt. stat. Motorenbau, 6800 Mannheim | Einrichtung zur einspritzung von zuendkraftstoff einerseits und zuendunwilligem hauptkraftstoff andererseits fuer dieselmotoren |
-
1984
- 1984-07-11 DE DE3425460A patent/DE3425460A1/de not_active Withdrawn
- 1984-08-16 DE DE8484109736T patent/DE3481209D1/de not_active Expired - Lifetime
- 1984-08-16 EP EP84109736A patent/EP0142631B1/fr not_active Expired - Lifetime
- 1984-08-24 US US06/644,086 patent/US4590903A/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE596917C (de) * | 1932-10-08 | 1934-11-15 | Walter Herrmann Dipl Ing | Einspritzvorrichtung fuer Brennkraftmaschinen |
US2537087A (en) * | 1942-03-07 | 1951-01-09 | Atlas Diesel Ab | Fuel injection apparatus |
Also Published As
Publication number | Publication date |
---|---|
US4590903A (en) | 1986-05-27 |
DE3425460A1 (de) | 1985-03-07 |
EP0142631A2 (fr) | 1985-05-29 |
DE3481209D1 (de) | 1990-03-08 |
EP0142631A3 (en) | 1987-05-27 |
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