NO782661L - FUEL INJECTION SYSTEM FOR DIESEL ENGINES - Google Patents

FUEL INJECTION SYSTEM FOR DIESEL ENGINES

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Publication number
NO782661L
NO782661L NO782661A NO782661A NO782661L NO 782661 L NO782661 L NO 782661L NO 782661 A NO782661 A NO 782661A NO 782661 A NO782661 A NO 782661A NO 782661 L NO782661 L NO 782661L
Authority
NO
Norway
Prior art keywords
fuel injection
injection system
magazine
fuel
valve
Prior art date
Application number
NO782661A
Other languages
Norwegian (no)
Inventor
Richard Steigenberger
Dieter Hirt
Original Assignee
Maschf Augsburg Nuernberg 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 Maschf Augsburg Nuernberg Ag filed Critical Maschf Augsburg Nuernberg Ag
Publication of NO782661L publication Critical patent/NO782661L/en

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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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/02—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor being spaced from pumping elements
    • F02M41/06—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor being spaced from pumping elements the distributor rotating
    • 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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/16—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor characterised by the distributor being fed from a constant pressure source, e.g. accumulator or constant pressure positive displacement pumps
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0628—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a stepped armature
    • 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
    • F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
    • F02M63/0007—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using electrically actuated valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator

Abstract

Brennstoffinnsprøytningssystem for dieselmotorerFuel injection system for diesel engines

Description

cc

Oppfinnelsen angår et brennstoffinnsprøytningssystem for dieselmotorer. Realiseringen av et elektronisk styrbart brennstoffinnsprøytningssystem for dieselmotorer er særlig ved hurtigløpende lastebilmotorer forbundet med betydelige vanskelig-, heter. Dette beror på at det tidligere vanlige system med pumpe The invention relates to a fuel injection system for diesel engines. The realization of an electronically controllable fuel injection system for diesel engines is associated with considerable difficulties, particularly in the case of fast-running truck engines. This is because the previously common system with a pump

og dyse ikke er egnet for adskilt, uavhengig styring av innsprøyt-ningsmehgde og innsprøytningstidspunkt. and nozzle are not suitable for separate, independent control of injection quantity and injection time.

Forsøk med andre systemer, som f.eks. med konstant brennstofftrykk og styrte ventilåpningstider, har vist at den for tomgang nødvendige, lille innsprøytningsmengde bare kan oppnås med ekstremt korte innsprøytningstider som imidlertid ikke lar seg realisere tilstrekkelig reproduserbart "med elektroniske og servo-hydrauliske styreventiler. Experiment with other systems, such as e.g. with constant fuel pressure and controlled valve opening times, has shown that the small injection amount required for idling can only be achieved with extremely short injection times which, however, cannot be realized sufficiently reproducibly "with electronic and servo-hydraulic control valves.

Ifølge oppfinnelsen løses dette problem ved at inn-sprøytningsmengden ikke lenger bestemmes av innsprøytningsventilens åpningstid, men av en volumetrisk dosering. According to the invention, this problem is solved by the fact that the injection amount is no longer determined by the injection valve's opening time, but by a volumetric dosage.

Ifølge en fordelaktig utførelse av oppfinnelsen skjer den volumetriske tilmåling av innsprøytningsmengden ved hjelp av et doseringsmagasin i hvilket den brennstoffmengde som skal inn-sprøytes, lagres trykkavhengig foran dysen. Ifølge en ytterligere, fordelaktig utførelse av oppfinnelsen kan magasinet være utført som fjærtrykkmagasin eller også som hydropneumatisk magasin. Fyllingen av dette magasin skjer i de tilstrekkelig lange pauser mellom innsprøytningene, via en turtallssyhkront og fasestivt drevet fordeler. According to an advantageous embodiment of the invention, the volumetric measurement of the injection amount takes place by means of a dosing magazine in which the amount of fuel to be injected is stored in a pressure-dependent manner in front of the nozzle. According to a further, advantageous embodiment of the invention, the magazine can be designed as a spring pressure magazine or also as a hydropneumatic magazine. The filling of this magazine takes place during the sufficiently long breaks between the injections, via a speed-controlled and phase-rigidly driven distributor.

Dosseringsmagasinets stempel blir hensiktsmessig ut-ført slik at det også overtar funksjonen til en sperre- eller stengeventil for utstrømningsbegrensning. Dermed oppnås at brenn-stof ft rykk ledningen mellom fordeler og doseringsmagasin ved slut-ten av innsprøytningsforløpet ikke blir helt trykkløs og tømmes, .og at innsprøytningsforløpet etter utstrømning av den på forhånd lagrede mengde av seg selv plutselig avsluttes. The dosing magazine's piston is suitably designed so that it also takes over the function of a shut-off or shut-off valve for outflow restriction. In this way, it is achieved that, at the end of the injection sequence, the fuel and the line between the distributor and the dosing magazine are not completely depressurized and emptied, and that the injection sequence, after outflow of the pre-stored amount, suddenly ends by itself.

Den vesentlige styringstekniske fordel ved brennstoff innsprøytningssystemet ifølge oppfinnelsen består i at løfte-magneten bare må påvirkes kortvarig for innledning av en åpnings-bevegelse av innsprøytningsnålen, og at varigheten av dens magnetisering ikke lenger er bestemmende for den innsprøytede mengde. Dette faktum gjør det mulig å klare seg uten dyre elektrohydrau-liske servoventiler, da det for realisering av denne funksjon er The significant control technology advantage of the fuel injection system according to the invention consists in the fact that the lifting magnet only has to be affected briefly to initiate an opening movement of the injection needle, and that the duration of its magnetization is no longer decisive for the injected quantity. This fact makes it possible to do without expensive electro-hydraulic servo valves, as for the realization of this function it is

. tilstrekkelig med enklere løftemagneter.. sufficient with simpler lifting magnets.

For frembringelse av innsprøytningstrykket blir ifølge oppfinnelsen en trykkregulert brennstoffpumpe innkoplet foran fordeleren. Denne pumpe blir med fordel utført som regulerbar aksialstempelpumpe med en.trykkregulator som styres fra kjøre-eller gasspedalen. Trykkregulatoren tilpasser pumpens fremførings-mengde automatisk til behovet på en slik måte at det ved hjelp av pedalstillingen forutbestemte trykk holdes konstant. Denne type trykkregulering, ved hvilken det bare fremføres så mye brennstoff som er nødvendig, reduserer brennstoffpumpens drivenergi til det helt nødvendige omfang. For å dempe periodiske svingninger av fremmatningsmengdene og trykkene, er et hydropneumatisk magasin ifølge en ytterligere fordelaktig utførelse av oppfinnelsen tilkoplet mellom brennstoffpumpe og fordeler. I avhengighet av veiv-vinkelimpulser og gasspedalstilling sørger en elektronikk-kopling for en fasestiv, motorsynkron fordelerdrift og for turtalls- og lastavhengig innsprøytningsbegynnelse ved tilsvarende styring av nåleventil-løftemagneten. I stedet for drift av fordeleren ved hjelp av en elektrisk skrittmotor kan denne f.eks. også drives direkte mekanisk fra dieselmotoren uten at dette vil innvirke på den elektroniske styrbarhet av innsprøytnings-systemet. Som en spesiell fordel ved fordelersystemet skal det også anføres at det i forhold til andre systemer med konstant innsprøytningstrykk oppviser høyere driftssikkerhet, hvilket fremkommer ved tidsadskillelsen mellom fremmatning og innsprøyt-ning. According to the invention, a pressure-regulated fuel pump is connected in front of the distributor to generate the injection pressure. This pump is advantageously designed as an adjustable axial piston pump with a pressure regulator which is controlled from the driving or gas pedal. The pressure regulator adapts the pump's delivery quantity automatically to the need in such a way that the pre-determined pressure by means of the pedal position is kept constant. This type of pressure regulation, by which only as much fuel is supplied as is necessary, reduces the fuel pump's drive energy to the absolutely necessary extent. In order to dampen periodic fluctuations of the feed quantities and pressures, a hydropneumatic magazine is, according to a further advantageous embodiment of the invention, connected between the fuel pump and distributor. Depending on crank angle impulses and accelerator pedal position, an electronic coupling ensures a phase-rigid, engine-synchronous distributor operation and for rev- and load-dependent injection initiation by corresponding control of the needle valve lifting magnet. Instead of operating the distributor using an electric stepping motor, this can e.g. is also driven directly mechanically from the diesel engine without this affecting the electronic controllability of the injection system. As a special advantage of the distributor system, it should also be stated that, compared to other systems with constant injection pressure, it exhibits higher operational reliability, which is shown by the time separation between feed and injection.

Ifølge en ytterligere fordelaktig utførelse av oppfinnelsen er nåleventilen og doseringsmagasinet sammenbygget til According to a further advantageous embodiment of the invention, the needle valve and the dosing magazine are built together

en enhet. Derved fremkommer som en spesiell fordel at den brennstoffmengde som skal innsprøytes, kan lagres umiddelbart foran a unit. This results in a particular advantage that the amount of fuel to be injected can be stored immediately in front

spissen av nåleventilen, hvilket sikrer en rask avslutning av innsprøytningsforløpet uten ettersprøytning. the tip of the needle valve, which ensures a quick end to the injection sequence without post-injection.

Oppfinnelsen skal beskrives nærmere i forbindelse med et utførelseseksempel under henvisning til tegningene, der fig. 1 viser et brennstoffinnsprøytningssystem ifølge oppfinnelsen i skjematisk fremstilling, fig. 2 viser en innsprøytningsventil med integrert magasin ifølge oppfinnelsen, og fig. 3 viser en alterna-tiv utførelse av det på fig. 1 viste brennstoffinnsprøytnings-system. The invention shall be described in more detail in connection with an exemplary embodiment with reference to the drawings, where fig. 1 shows a fuel injection system according to the invention in schematic representation, fig. 2 shows an injection valve with integrated magazine according to the invention, and fig. 3 shows an alternative embodiment of that in fig. 1 showed a fuel injection system.

Det på fig. 1 viste brennstoffinnsprøytningssystem for en firesylindret dieselmotor, som ikke er vist, oppviser en trykkregulert brennstoffpumpe 1 som er sammenkoplet med en trykkregulator 2 som styres av en gasspedal 3. Brennstoffpumpen 1 drives av dieselmotoren og er for transport av brennstoff fra en tank 4 forbundet med en brennstoffordeler 5 som drives av en skrittmotor 6. Mellom fordeleren 5 og brennstoffpumpen 1 er innkoplet et dempningsmagasin 20. Under drift fordeler fordeleren 5 den fra brennstoffpumpen 1 transporterte eller frem-førte mengde i tidsbestemt definerte avstander på fire brennstoff-ledninger 7 av hvilke bare én er vist. Hver brennstoffledning 7 fører til et respektivt doseringsmagasin 8 som oppviser et hus 9 i hvilket det er anbrakt et magasinstempel 10 og en på magasinstempelet 10 i lukkeretningen virkende trykkfjær 11.. Stempelets 10 slaglengde begrenses ved hjelp av et mekanisk stillbart anslag, 12. En respektiv ytterligere brennstoffledning 13 fører fra That in fig. 1 shown fuel injection system for a four-cylinder diesel engine, which is not shown, has a pressure-regulated fuel pump 1 which is connected to a pressure regulator 2 which is controlled by an accelerator pedal 3. The fuel pump 1 is driven by the diesel engine and for transporting fuel from a tank 4 is connected to a fuel distributor 5 which is driven by a stepping motor 6. Between the distributor 5 and the fuel pump 1, a damping magazine 20 is connected. During operation, the distributor 5 distributes the quantity transported or advanced from the fuel pump 1 at time-defined distances on four fuel lines 7 of which only one is shown. Each fuel line 7 leads to a respective dosing magazine 8 which has a housing 9 in which a magazine piston 10 and a compression spring 11 acting on the magazine piston 10 in the closing direction are placed. The stroke length of the piston 10 is limited by means of a mechanically adjustable stop, 12. A respective further fuel line 13 leads from

hvert doseringsmagasin 8 til en respektiv elektromagnetisk manøvrert innsprøytningsventil 14 som er tilordnet til den tilsvarende sylinder i dieselmotoren. For hver sylinder i dieselmotoren er det altså anordnet en brennstoffledning 7, et'doseringsmagasin 8, en brennstoffledning 13 og en innsprøytningsventil 14. Hver inn-sprøytningsventil 14 har et hus 15 i hvilket det er anbrakt en aksialt bevegelig dysenål 16, en på dysenålen 16 i lukkeretningen virkende fjær 17 og en magnet 18 som er forbundet med dysenålen 16. Ved magnetisering av magneten 18'blir dysenålen 16 løftet opp mot virkningen av lukkefjæren 17 for å frigi ventilens strålefor-met anordnede utstrømningsåpninger, slik at brennstoff kan strømmme inn i den tilsvarende sylinders brennkammer. Løftemagneten 18 og skrittmotoren 6 styres fra en elektronikkinnretning 19 i hvilke each dosing magazine 8 to a respective electromagnetically operated injection valve 14 which is assigned to the corresponding cylinder in the diesel engine. For each cylinder in the diesel engine, there is therefore arranged a fuel line 7, a dosing magazine 8, a fuel line 13 and an injection valve 14. Each injection valve 14 has a housing 15 in which an axially movable nozzle needle 16 is placed, one on the nozzle needle 16 spring 17 acting in the closing direction and a magnet 18 which is connected to the nozzle needle 16. By magnetizing the magnet 18, the nozzle needle 16 is lifted up against the action of the closing spring 17 to release the valve's jet-shaped outflow openings, so that fuel can flow into it corresponding cylinder's combustion chamber. The lifting magnet 18 and the stepping motor 6 are controlled from an electronic device 19 in which

det innmates parametre, såsom motorens temperatur A, veivvinkel-stilling B og gasspedalstilling C. parameters are entered, such as engine temperature A, crank angle position B and accelerator pedal position C.

På fig. 2 er vist en innsprøytningsventil 25 med integrert magasin. Innsprøytningsventilens 25 dysenål er betegnet med henvisningstallet 26. Magasinrommet er betegnet med 21 og magasinfjæren er betegnet med 22. Løftemagneten er betegnet med 23 og et i brennstofftilførselsledningen innebygget filter er betegnet med 24. In fig. 2 shows an injection valve 25 with an integrated magazine. The nozzle needle of the injection valve 25 is designated by the reference number 26. The magazine compartment is designated by 21 and the magazine spring is designated by 22. The lifting magnet is designated by 23 and a filter built into the fuel supply line is designated by 24.

Innsprøytningsventen 25. erstatter en innsprøytnings-ventil 14, en brennstoffledning 13 og et doseringsmagasin 8 ved anvendelse av det på fig. 1 viste brennstoffinnspøytningssystem. The injection valve 25 replaces an injection valve 14, a fuel line 13 and a dosing magazine 8 when using the one in fig. 1 showed a fuel injection system.

I det på fig. 3 viste, alternative brennstoffinnsprøyt-ningssystem for en firesylindret motor blir det i stedet for fjær-magasiner benyttet hydrauliske doseringsmagasiner 30. Hvert magasin 30 består av en sylinder 31 i hvilken det er anordnet et aksialt bevegelig stempel 32. Hvert stempel 32 oppdeler den til-hørende sylinders 31 innerrom i to delrom-. 32 og 34 av hvilke delrommet 33 opptar, hydaulikkvæske og delrommet 34 tjener til lagring av brennstoff som skal innsprøytes. Hvert delrom 34 er over en respektiv brennstoffledning 35, i. hvilken det er anordnet en til-bakeslagsventil 36, forbundet med en brennstoffpumpe 37 av konvensjonell type for en sekssylindret motor. Fra hver brennstoffledning 35 avgrenes en ytterligere brennstoffledning 38 som fører til en respektiv av fire elektromagnetisk manøvrerte innsprøytnings-ventiler 39. Innsprøytningsventilene 39 er identiske med inn-sprøytningsventilene 14 i det på fig. 1 viste brennstoffinnsprøyt-ningssystem. Innsprøytningsventilene 39 skal derfor ikke beskrives nærmere her. In that in fig. 3 shown, alternative fuel injection system for a four-cylinder engine, hydraulic dosing magazines 30 are used instead of spring magazines. Each magazine 30 consists of a cylinder 31 in which an axially movable piston 32 is arranged. Each piston 32 divides it into hearing cylinder's 31 inner chamber in two sub-chambers. 32 and 34 of which sub-space 33 occupies hydraulic fluid and sub-space 34 serves for storing fuel to be injected. Each sub-compartment 34 is over a respective fuel line 35, in which a non-return valve 36 is arranged, connected to a fuel pump 37 of a conventional type for a six-cylinder engine. From each fuel line 35 branches off a further fuel line 38 which leads to a respective one of four electromagnetically operated injection valves 39. The injection valves 39 are identical to the injection valves 14 in the one in fig. 1 showed a fuel injection system. The injection valves 39 shall therefore not be described in more detail here.

Hvert delrom 33 i den respektive magasinsylinder 31Each compartment 33 in the respective magazine cylinder 31

er over en ledning 40 forbundet med et hydraulikkmagasin 41 av konvensjonell konstruksjon. En ytterligere hydraulikkledning 42 forbinder hydraulikkmagasinet 41 med brennstoffpumpen 37.. Ledningen 4 2 har to grener av hvilke hver er tilkoplet til brennstoffpumpen 37. I hver gren av ledningen 42 befinner det seg en tilbakeslags-ventil 43 som er identisk med tilbakeslagsventilene 36. En tilbake-løpsledning 44 forbinder hydraulikkmagasinet 41 med en brennstofftank 45 som via en brennstoffledning 46 er forbundet med brennstoffpumpen 37. I tilbakeløpsledningen 44 er det anordnet en regulerbar trykkhpldeventil 47 som er av konvensjonell konstruksjon og som styres fra en elektronisk regner 48. Regneren 48 styrer også løftemagneten for hver innsprøytningsventil 39, slik som ved det på fig. 1 viste brennstoffinnsprøytningssystem. Hydraulikkmagasinets volum er vesentlig større enn doseringsmagasinets 30 magasinvolum. is connected via a line 40 to a hydraulic magazine 41 of conventional construction. A further hydraulic line 42 connects the hydraulic reservoir 41 to the fuel pump 37. The line 4 2 has two branches, each of which is connected to the fuel pump 37. In each branch of the line 42 there is a non-return valve 43 which is identical to the non-return valves 36. A back -flow line 44 connects the hydraulic reservoir 41 with a fuel tank 45 which is connected via a fuel line 46 to the fuel pump 37. In the return line 44 there is an adjustable pressure relief valve 47 which is of conventional construction and which is controlled from an electronic counter 48. The counter 48 also controls the lifting magnet for each injection valve 39, as in the case of fig. 1 showed a fuel injection system. The volume of the hydraulic magazine is significantly larger than the 30 magazine volume of the dosing magazine.

Brennstoffpumpen 37 drives av motoren og er forbundet med gasspedalen 4-9 . The fuel pump 37 is driven by the engine and is connected to the gas pedal 4-9.

Under drift av det alternative brennstoffinnsprøyt-ningssystem transporterer brennstoffpumpen 37 brennstoff fra tanken 45 intermitterende inn i et respektivt delrom 34 av det tilhørende doseringsmagasin 30 og inn i hydraulikkmagasinet 41, idet den lastavhengige transport- eller fremmatningsmengde til-måles ved hjelp av gasspedalens. 49 stilling. De forskjellige stillinger eller bevegelser av magasinstempelet er vist på fig. 3 Og betyr fra venstre mot høyre "nullstilling", "magasinering"., "innsprøytning" og på nytt "nullstilling". Den mot delrommet 33 vendende side av det aktuelle magasinstempel 3.2 påvirkes av trykk som frembringes i hydraulikkmagasinet 41, som bestemmes av regneren 48 i avhengighet av den aktuelle last- og motortilstand, og som reguleres ved hjelp av trykkholdeventil.en 47. Dette trykk tilsvarer brennstoffets innsprøytningstrykk. During operation of the alternative fuel injection system, the fuel pump 37 transports fuel from the tank 45 intermittently into a respective compartment 34 of the associated dosing magazine 30 and into the hydraulic magazine 41, the load-dependent transport or feed amount being measured using the accelerator pedal. 49 position. The different positions or movements of the magazine piston are shown in fig. 3 And means from left to right "zero position", "storage"., "injection" and again "zero position". The side of the respective magazine piston 3.2 facing the compartment 33 is affected by pressure produced in the hydraulic magazine 41, which is determined by the calculator 48 depending on the relevant load and engine condition, and which is regulated by means of a pressure holding valve 47. This pressure corresponds to the fuel's injection pressure.

Innsprøytningstrykket forblir tilnærmet konstant under innsprøytningsforløpet, på grunn av at volumendringen i doseringsmagasinet er liten i forhold til hydraulikkmagasinets 41 volum. The injection pressure remains approximately constant during the injection process, due to the fact that the volume change in the dosing magazine is small in relation to the volume of the hydraulic magazine 41.

Claims (16)

1. Brennstoffinnsprøytningssystem for.dieselmotorer med minst én elektromagnetisk manø vrert innsprøytningsventil, karakterisert ved at tilmålingen av innsprøytnings-mengden skjer på volumetrisk måte.1. Fuel injection system for diesel engines with at least one electromagnetically operated injection valve, characterized in that the measurement of the injection quantity takes place in a volumetric manner. 2. Brennstoffinnsprøytningssystem ifølge krav 1,. karakterisert ved at den volumetriske tilmåling skjer i avhengighet av brennstoffinnsprøytningstrykket.2. Fuel injection system according to claim 1. characterized in that the volumetric metering takes place in dependence on the fuel injection pressure. 3. Brennstoffinnsprøytningssystem ifølge krav 1 eller 2, karakterisert ved at den volumetriske tilmåling begrenses ved hjelp av utvendig regulerbare, mekaniske anslag.3. Fuel injection system according to claim 1 or 2, characterized in that the volumetric measurement is limited by means of externally adjustable, mechanical stops. 4 . Brennstoffinnsprøytningssystem ifølge ett av de foregående krav, karakterisert ved at det er anordnet en innretning for volumetrisk tilmåling hvilken innretning, er utført i form av et magasin.4. Fuel injection system according to one of the preceding claims, characterized in that a device for volumetric metering is arranged, which device is made in the form of a magazine. 5. Brennstoffinnsprøytningssystem ifølge krav 4, karakterisert ved at magasinet er anordnet så nær nåleventilen som mulig.5. Fuel injection system according to claim 4, characterized in that the magazine is arranged as close to the needle valve as possible. 6. Brennstoffinnsprøytningssystem ifølge krav 5, karakterisert ved at magasinet er integrert i inn-sprø ytningsventilen og konsentrisk omslutter dysenålen.6. Fuel injection system according to claim 5, characterized in that the magazine is integrated into the injection delivery valve and concentrically surrounds the nozzle needle. 7. Brennstoffinnsprøytningssystem ifølge ett av kravene 4-6, karakterisert ved at magasinstempelet samtidig tjener som ventil for utstrø mningsbegrensning.7. Fuel injection system according to one of claims 4-6, characterized in that the magazine piston simultaneously serves as a valve for flow restriction. 8. Brennstoffinnsprøytningssystem ifølge ett av kravene' 4-7, karakterisert ved at fyllingen av magasinet skjer på tidsukritisk måte i pausene mellom innsprøytningene.8. Fuel injection system according to one of claims 4-7, characterized in that the filling of the magazine takes place in a time-independent manner during the breaks between the injections. 9. Brennstoffinnsprøytningssystem ifølge krav 8, karakterisert ved at det for fylling av magasinet eller magasinene er anordnet en fra: forbrenningsmotoren mekanisk, drevet fordeler.9. Fuel injection system according to claim 8, characterized in that for filling the magazine or magazines there is arranged one from: the combustion engine mechanical, driven distributor. 10. Brennstoffinnsprøytningssystem ifølge krav 8, karakterisert ved at fyllingen av magasinet under innsprøytningspausene skjer ved hjelp av et med hensyn til fremmatningsmengde styrbart innsprøytningspumpeelement av konvensjonell art.10. Fuel injection system according to claim 8, characterized in that the filling of the magazine during the injection breaks takes place by means of a controllable injection pump element of a conventional type with regard to the amount of feed. 11. Brennstoffinnsprøytningssystem ifølge krav 9, karakterisert ved at fordelerens drift alternativt skjer over en elektronisk styrt skrittmotor fasestivt og synkront med motorturtallet.11. Fuel injection system according to claim 9, characterized in that the distributor's operation alternatively takes place via an electronically controlled stepper motor in a fixed phase and synchronously with the engine speed. 12. Brennstoffinnsprøytningssystem ifølge ett av de foregående krav, karakterisert ved at innsprøyt-nings-nåleventilens deler er dimensjonert slik at ventilen ved kortvarig påvirkning av en lø ftemagnet kan bringes inn i et hydraulisk understøttet åpningsforløp i hvilket den også etter deaktivering av løftemagneten befinner seg frem til innsprøyt-ningsf orløpets avslutning, idet den deretter ved bortfall av det hydrauliske åpningstrykk under påvirkning av fjærkraften vender tilbake til lukkestillingen.12. Fuel injection system according to one of the preceding claims, characterized in that the parts of the injection needle valve are dimensioned so that the valve can be brought into a hydraulically supported opening course in a hydraulically supported opening course, in which it is also located forward after deactivation of the lifting magnet to the end of the injection flow, as it then returns to the closed position when the hydraulic opening pressure disappears under the influence of the spring force. 13. Brennstoffinnsprø ytningssystem ifølge ett av de foregående krav, karakterisert ved at det.for frembringelse av det nødvendige innsprøytningstrykk er anordnet en brennstoffpumpe med regulerbar fremmatningsmengde,13. Fuel injection system according to one of the preceding claims, characterized in that a fuel pump with adjustable delivery quantity is arranged to produce the required injection pressure, 14. Brennstoffinnsprøytningssystem ifølge krav 13, karakterisert ved at f remma.tningsmengden styres av en trykkregulator hvis innstilling er sammenkoplet med gasspedalen....14. Fuel injection system according to claim 13, characterized in that the delivery quantity is controlled by a pressure regulator whose setting is linked to the gas pedal.... 15. Brennstoffinnsprøytningssystem ifølge krav 13 eller 14, karakterisert ved at. det etter f remmatnings-pumpen er innkoplet et hydraulikkmagasin for dempning av frem-matningssvingninger og trykkpulsasjoner.15. Fuel injection system according to claim 13 or 14, characterized in that. a hydraulic reservoir is connected after the feed pump to dampen feed fluctuations and pressure pulsations. 16. Brennstoffinnsprø ytningssystem ifølge ett av de foregående krav, karakterisert ved at det for den elektriske styring av nåleventilen og/eller fordelerdriften er anordnet en elektronikkinnretning som bevirker en automatisk forskyvning av nåleventilens åpningstidspunkt, avhengig av forskjellige parametre, såsom motorturtall, gasspedalstilling (last) og driftstemperaturer.16. Fuel injection performance system according to one of the preceding claims, characterized in that for the electrical control of the needle valve and/or distributor operation, an electronic device is arranged which causes an automatic displacement of the opening time of the needle valve, depending on various parameters, such as engine speed, accelerator pedal position (load) and operating temperatures.
NO782661A 1977-08-05 1978-08-03 FUEL INJECTION SYSTEM FOR DIESEL ENGINES NO782661L (en)

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DE19772735448 DE2735448A1 (en) 1977-08-05 1977-08-05 FUEL INJECTION SYSTEM FOR DIESEL ENGINES

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JP (1) JPS5428930A (en)
BE (1) BE869341A (en)
CH (1) CH632319A5 (en)
DD (1) DD137611A1 (en)
DE (1) DE2735448A1 (en)
DK (1) DK347178A (en)
FI (1) FI782373A (en)
FR (1) FR2399550A1 (en)
GB (1) GB2002059B (en)
IT (1) IT7850584A0 (en)
NL (1) NL7807998A (en)
NO (1) NO782661L (en)
SE (1) SE7808300L (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2449795B1 (en) * 1979-02-24 1986-11-28 Huber Motorenbau Inst INJECTION SYSTEM FOR INTERNAL COMBUSTION ENGINE
DE3310030C2 (en) * 1983-03-19 1986-12-04 L'Orange GmbH, 7000 Stuttgart Fuel injection device for an internal combustion engine
AT395896B (en) * 1985-09-20 1993-03-25 Steyr Daimler Puch Ag DEVICE FOR CONTROLLING AN INJECTION PUMP OF AN INJECTION INTERNAL COMBUSTION ENGINE
DE19904074A1 (en) * 1999-02-02 2000-08-03 Bosch Gmbh Robert Delivery arrangement for liquid medium has step change transmission between electric motor of electric drive arrangement and distributor arrangement
DE19954206A1 (en) * 1999-11-11 2001-05-23 Bosch Gmbh Robert Fuel injection system

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Publication number Priority date Publication date Assignee Title
DE668115C (en) * 1936-04-01 1938-11-26 Auto Union A G Electrically controlled valve for injection pumps, especially for internal combustion engines
GB1262089A (en) * 1968-09-06 1972-02-02 Cav Ltd Fuel injection systems
DE1942610A1 (en) * 1969-08-21 1971-03-11 Bosch Gmbh Robert Fuel injection system for internal combustion engines
GB1403363A (en) * 1971-10-30 1975-08-28 Cav Ltd Fuel injection systems
DE2342109C2 (en) * 1973-08-21 1983-10-27 Robert Bosch Gmbh, 7000 Stuttgart Electromechanically controlled fuel injection valve for internal combustion engines

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DE2735448A1 (en) 1979-02-08
BE869341A (en) 1978-11-16
GB2002059B (en) 1982-04-28
GB2002059A (en) 1979-02-14
NL7807998A (en) 1979-02-07
FI782373A (en) 1979-02-06
DK347178A (en) 1979-02-06
JPS5428930A (en) 1979-03-03
FR2399550A1 (en) 1979-03-02
DD137611A1 (en) 1979-09-12
IT7850584A0 (en) 1978-08-03
SE7808300L (en) 1979-02-06
CH632319A5 (en) 1982-09-30

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