SE537277C2

SE537277C2 - Method and system for analyzing injection means

Info

Publication number: SE537277C2
Application number: SE1350826A
Authority: SE
Inventors: Björn Johansson
Original assignee: Scania Cv Ab
Priority date: 2013-07-03
Filing date: 2013-07-03
Publication date: 2015-03-24
Also published as: WO2015002593A1; DE112014002489T5; SE1350826A1

Abstract

Sammandrag Ett farfarande och ett system for analys av en funktion for atminstone ett insprutningsorgan 131_13N i en farbranningsmotor beskrivs. Nedvarvningstiderrelaterade till insprutningsorgan i en motor faststalls forst. Sedan utfor en justeringsenhet 144 en justering av den ursprungliga mangden M —predet bransle vilken tillfors respektive cylinder am atminstone en nedvarvningstid av de faststallda nedvarvningstiderna Tl_TN avviker fran ett nedvarvningstidsintervall Tpredet 1.••Tpredet N fOr motsvarande insprutningsorgan. Justeringen, som utfors av justeringsenheten for vart och ett insprutningsorgan som har en avvikande nedvarvningstid, utfors i enlighet med en iterativ algoritm till dess att en justerad avvikande Summary A method and a system for analyzing a function of at least one injector 131_13N in a combustion engine are described. Downsizing times related to injection means in an engine are first determined. Then, an adjusting unit 144 performs an adjustment of the initial amount of the M -preed fuel which is supplied to each cylinder at least one downshift time of the determined downshift times T1_TN deviates from a downshift time interval Tpred 1. •• Tpred N for the corresponding injection means. The adjustment, which is performed by the adjusting unit for each injector having a deviating deceleration time, is performed according to an iterative algorithm until an adjusted deviating

Description

537 277 FoRFARANDE OCH SYSTEM FOR ANALYS AV INSPRUTNINGSORGAN Tekniskt omrade Fareliggande uppfinning avser ett farfarande far analys av en funktion for atminstone ett insprutningsorgan i en farbranningsmotor enligt ingressen till patentkrav 1. TECHNICAL FIELD The present invention relates to a method for analyzing a function of at least one injection means in a combustion engine according to the preamble of claim 1.

Fareliggande uppfinning avser aven ett system anordnat far analys av en funktion for Atminstone ett insprutningsorgan i en forbranningsmotor enligt ingressen till patentkrav 19, samt ett datorprogram och en datorprogramprodukt, vilka implementerar forfarandet enligt uppfinningen. The present invention also relates to a system arranged for analysis of a function of at least one injection means in an internal combustion engine according to the preamble of claim 19, as well as a computer program and a computer program product, which implement the method according to the invention.

Bakgrund Faljande bakgrundsbeskrivning utgar en beskrivning av bakgrunden till fareliggande uppfinning, och mAste suedes inte nadvandigtvis utgara tidigare kOnd teknik. Background The following background description is a description of the background to the present invention, and does not necessarily have to be prior art.

Farbranningsmotorer, sAsom exempelvis forbranningsmotorer innefattade i fordon eller fartyg, drivs av bransle, sasom exempelvis diesel, bensin, etanol, eller blandningar av sAdana branslen med varandra och/eller med tillsatser av olika slag. Branslet tillhandahAlls farbranningsmotorn av ett branslesystem, innefattande bland annat en eller flera bransletankar och anordningar vilka transporterar branslet tram bransletankarna till forbranningsmotorn. Anordningarna som transporterar branslet till motorn kan innefatta exempelvis ledningar far transport av branslet mom fordonet, en eller flera pumpar, vilka kan vara indelade i lag- respektive hogtryckskretsar, filter, kopplingar, och andra anordningar far bransletransport. BrOnslet sprutas in i motorns cylindrar av ett brOnsleinsprutningssystem vilket innefattar ett insprutningsorgan, Oven benamnt injektor eller insprutare, per cylinder. Insprutningsorganet kan exempelvis tillhandahAllas bransle av en common rail-enhet, vilken 1 537 277 tillhandahaller trycksatt brOnsle till alla insprutningsorganen, eller av separata enheter med trycksatt brOnsle for respektive insprutningsanordning. Combustion engines, such as internal combustion engines included in vehicles or ships, are powered by fuel, such as diesel, gasoline, ethanol, or mixtures of the fuel industry with each other and / or with additives of various kinds. The fuel provides the entire combustion engine with a fuel system, including one or more fuel tanks and devices which transport the fuel and the fuel tanks to the internal combustion engine. The devices that transport the fuel to the engine may include, for example, lines for transporting the fuel to the vehicle, one or more pumps, which may be divided into legal and high-pressure circuits, filters, couplings, and other devices for industry transport. The fuel is injected into the engine cylinders by a fuel injection system which includes an injection means, also called an injector or injector, per cylinder. The injection means can, for example, provide all the fuel industry with a common rail unit, which 1 537 277 provides pressurized fuel to all the injection means, or with separate units with pressurized fuel for the respective injection device.

Kortfattad beskrivning av uppfinningen Det Or Onskvart att lika mycket bransle sprutas in i var och en av motorns cylindrar nar motorn är igang far att erhalla ett jamnt moment fran motorn. Brief Description of the Invention It is desirable that the same amount of fuel be injected into each of the engine cylinders when the engine is running to obtain an even torque from the engine.

Insprutningsorganen sprutar dock ofta in olika mycket brOnsle i cylindrarna pa grund av individuella variationer far insprutningsorganen. Sadana individvariationer kan bero pa sma skillnader uppkomna vid tillverkningen av respektive insprutningsorgan. However, the injectors often inject different amounts of fuel into the cylinders due to individual variations of the injectors. Such individual variations may be due to small differences in the manufacture of the respective injection means.

Insprutningsorganen utsatts Oven far ett mekaniskt slitage Over tid, for vilket ett medelslitage fOr hela populationen av insprutningsorgan kan bestammas. I vissa fall kan Oven insprutningssystemet korrigera for detta medelslitage far att begrOnsa dess inverkan pa framforandet av fordonet. Injection means exposed Above, mechanical wear over time, for which an average wear for the entire population of injection means can be determined. In some cases, the Oven injection system can correct for this wear and tear to limit its impact on the driving of the vehicle.

Dock kan aven individuella skillnader mellan enskilda insprutningsorgans slitage foreligga pa grund av att insprutningsorganen har individuella egenskaper, vilka kan bero pa tillverkningsskillnader mellan insprutningsorganen och/eller pa slitage av insprutningsorganen. Framfarallt insprutningsorganens olika inslitningsbeteenden, vilka resulterar i individuellt olika slitage av insprutningsorganen, Or svara att faststalla och korrigera far med tidigare kanda losningar. However, individual differences between the wears of individual injectors can also exist due to the fact that the injectors have individual properties, which may be due to manufacturing differences between the injectors and / or in the wear of the injectors. In particular, the different wear behaviors of the injection means, which result in individually different wear of the injection means, are responsible for determining and correcting father with previously known solutions.

Eftersom insprutningsorganen utsdtts far ett mekaniskt slitage Over tid kan aven problem uppsta om en eller flera insprutningsorgan byts ut i fordonet. Det eller de nya insprutningsorgan som monteras i fordonet kommer da inte vara 2 537 277 inslitna och kommer uppfora sig annorlunda an de insprutningsorgan som inte har bytts ut. As the injection means are subjected to mechanical wear Over time, problems can also arise if one or more injection means are replaced in the vehicle. The new injection member (s) mounted in the vehicle will then not be worn in 537 277 and will behave differently from the injection members which have not been replaced.

De olika egenskaperna som kan uppsta far insprutningsorganen gor att momentet som tillhandahalls av forbranningsmotorn blir ojamnt. Detta illustreras schematiskt i figurerna la och lb, i vilka varvtalet co, vilket är relaterat till momentet M for motorn, far en attacylinders fyrtaktsmotor visas som funktion av vevvinkeln for vevaxeln. I figur la visas ett schematiskt exempel pa en motor med insprutningsorgan med vasentligen lika egenskaper, det vill saga atta insprutningsorgan som sprutar in vasentligen samma mangd bransle i respektive cylinder, varvid varvtalet okar och minskar vasentligen lika mycket vid insprutning av bransle i var och en av cylindrarna. Om exempelvis insprutningsorganen tillverkas med vasentligen lika egenskaper och darefter slits vasentligen pa samma satt kan varvtalet enligt figur la alltsa erhallas. The various properties that can arise from the injection means cause the torque provided by the internal combustion engine to be uneven. This is schematically illustrated in Figures 1a and 1b, in which the speed co, which is related to the torque M of the engine, is shown by an eight-cylinder four-stroke engine as a function of the crank angle of the crankshaft. Figure 1a shows a schematic example of an engine with injection means with substantially equal properties, i.e. eight injection means which inject substantially the same amount of fuel into each cylinder, the speed increasing and decreasing substantially the same when injecting fuel into each of the cylinders. If, for example, the injection means are manufactured with substantially the same properties and then wear essentially in the same way, the speed according to Figure 1a can thus be obtained.

Om en eller flera insprutningsorgan sprutar in en avvikande mangd bransle i respektive cylinder erhalls istallet ett ojamnt moment, sasom illustreras i figur lb. I det schematiska exemplet i figur lb sprutar insprutningsorganet i den fOrsta cylindern in far mycket bransle, det viii saga mer bransle an ovriga insprutningsorgan, vilket gOr att varvtalet 5kar for mycket vid insprutningen far denna cylinder och aven att varvtalet for atminstone den andra cylindern paverkas sa att aven dess varvtal blir for hogt. Sedan sjunker varvtalet far insprutningarna i de efterfoljande cylindrarna igen till dess att nasta cykels insprutningar borjar. Det i figur lb visade exemplet skulle ge ett av motorn ojamnt tillhandahallet moment, vilket har en negativ inverkan pa fordonets prestanda. If one or more injection means injects a deviating amount of fuel into the respective cylinder, an uneven torque is obtained instead, as illustrated in Figure 1b. In the schematic example in Figure 1b, the injector in the first cylinder injects a lot of fuel, that is to say more fuel than other injectors, which means that the speed increases too much during the injection in this cylinder and also that the speed of at least the second cylinder is affected so that even its speed becomes too high. Then the speed drops, the injections in the subsequent cylinders return until the next cycle's injections begin. The example shown in Figure 1b would give a torque unevenly supplied by the engine, which has a negative effect on the performance of the vehicle.

Dessutom kan det ojamna momentet samverka med resonanser i exempelvis ett fordon, sasom resonanser i drivlinan, vilket 3 537 277 gir att resonanserna och det ojdmna momentet firstdrker varandra och resulterar i relativt stora svangningar for drivlinan och/eller motormomentet. Svdngningar fir drivlinan och/eller momentet kan alltsi bli relativt stora och kommer di av en fOrare av ett fordon att upplevas irriterande och/eller obehagliga. In addition, the uneven moment can co-operate with resonances in, for example, a vehicle, such as resonances in the driveline, which results in the resonances and the uneven momentum reinforcing each other and resulting in relatively large oscillations for the driveline and / or the engine torque. Fluctuations in the driveline and / or torque can thus be relatively large and will be experienced by a driver of a vehicle as annoying and / or unpleasant.

Tidigare kanda losningar har farsakt motverka det ojdmna momentet genom att stalla in insprutningsorganen fir att kompensera fir, och minska, deras individuella skillnader. Previous kanda solutions have successfully counteracted the uneven momentum by setting up the injection means to compensate for, and reduce, their individual differences.

Dock kraver denna kompensation en analys av varvtalet under tomging och drift. Denna analys är svir att gOra robust, eftersom det är svArt att sarskilja de olika insprutningsorganen vid analysen pi grund av att resonanser forekommer i drivlinan och pi grund av att varvtalssignalen hela tiden piverkas av flera cylindrar, och dess insprutningsorgan, samtidigt, eftersom forbranningarna i cylindrarna ligger ndra varandra i tid och vevvinkel fir de olika cylindrarna. AvstAndet i vevvinkel mellan farbrdnningarna/insprutningarna beror av antalet cylindrar i motorn. For exempelvis en Attacylindrig motor kan det vara 900 mellan farbranningarna/insprutningarna, medan det kan vara 144° mellan dem i en femcylindrig motor. However, this compensation requires an analysis of the speed during tomging and operation. This analysis is difficult to make robust, because it is difficult to distinguish the different injection means in the analysis due to resonances occurring in the driveline and due to the fact that the speed signal is constantly pivoted by several cylinders, and its injection means, at the same time, because the combustion in the cylinders lie down each other in time and crank angle for the different cylinders. The distance in the crank angle between the burns / injections depends on the number of cylinders in the engine. For example, for an Attacyl-engine, it can be 900 between the burns / injections, while it can be 144 ° between them in a five-cylinder engine.

Resonanssvdngningarna i drivlinan kan ocksi ge upphov till svangningar som Or lika, och latt kan forvaxlas med, varvtalssvdngningar pi grund av defekta insprutningsorgan. The resonant oscillations in the driveline can also give rise to oscillations which are equal to, and can easily be confused with, speed oscillations due to defective injection means.

Alltsd gor flera faktorer att de tidigare kanda losningarna inte Or robusta och inte heller ger tillfarlitliga och/eller exakta resultat. Thus, several factors mean that the previously known solutions do not Or robusta nor give reliable and / or accurate results.

Det Or ddrfor ett syfte med fareliggande uppfinning att tillhandahilla ett forfarande och ett system fir analys av en 4 537 277 funktion for Atminstone ett insprutningsorgan vilka Atminstone delvis loser ovan namnda problem Detta syfte uppnas genom det ovan namnda forfarandet enligt den kannetecknande delen av patentkrav 1. Syftet uppnas aven genom ovan namnda system enligt kannetecknande delen av patentkrav 19 samt av ovan namnda datorprogram och datorprogramprodukt. It is an object of the present invention to provide a method and a system for analyzing a function for at least one injection means which At least partially solves the above-mentioned problems. This object is achieved by the above-mentioned method according to the characterizing part of claim 1. The object is also achieved by the above-mentioned system according to the characterizing part of claim 19 and by the above-mentioned computer program and computer program product.

Analysen enligt foreliggande uppfinning mojliggor en snabb och tillfarlitlig indikation pa om nagot, och i sa fall vilket, insprutningsorgan har en undermAlig funktion. Harigenom kan identifierade insprutningsorgan korrigeras och/eller bytas ut for att astadkomma ett jamnt motormoment. The assay of the present invention enables a rapid and reliable indication of whether, and if so which, injection means has a substandard function. As a result, identified injection means can be corrected and / or replaced to achieve a uniform engine torque.

Foreliggande uppfinning tillhandahAller genom analysen en heltackande indikation for alla insprutningsorganen i branslesystemet, vilket gar att defekta insprutningsorgan enkelt och med hog precision kan identifieras. Foreliggande uppfinning kan harigenom sanka drifts- och/eller underhallskostnaderna for fordonet avsevart, eftersom faktaunderstodda beslut om kostsamma byten av insprutningsorgan kan goras baserade pa analysen enligt foreliggande uppfinning. The present invention provides, through the analysis, a comprehensive indication for all the injection means in the industry system, which means that defective injection means can be easily and with high precision identified. The present invention can thereby significantly reduce the operating and / or maintenance costs of the vehicle, since fact-based decisions about costly replacement of injection means can be made based on the assay of the present invention.

Fararkomforten kan aven okas genom utnyttjande av fareliggande uppfinning, eftersom momentvariationer och/eller tillharande drivlineoscillationer kan undvikas, eller atminstone avsevart minskas. Danger comfort can also be increased by utilizing the present invention, since torque variations and / or associated driveline oscillations can be avoided, or at least considerably reduced.

Enligt olika utforingsformer av fareliggande uppfinning kan farfarandet enligt foreliggande uppfinning upprepas for olika varden pa den ursprungliga branslemangden M —predet och/eller far olika varden pa omgivningsparametrar som kan paverka insprutningen, varigenom tillfarlitligheten och exaktheten okas ytterligare for analysen enligt fareliggande uppfinning. 537 277 Kortfattad figurforteckning Uppfinningen kommer att belysas narmare nedan med ledning av de bifogade ritningarna, dOr lika hanvisningsbeteckningar anvands far lika delar, och van: Figurer la-b visar schematiskt exempel pa moment/varvtal i en motor for insprutningsorgan med lika respektive olika egenskaper, Figur 2 visar ett exempelfordon, i vilket fareliggande uppfinning kan implementeras, Figur 3 visar ett flodesschema for forfarandet enligt fareliggande uppfinning, Figur 4 visar en styrenhet enligt foreliggande uppfinning. Beskrivning av foredragna utforingsformer I detta dokument exemplifieras och beskrivs fareliggande uppfinning huvudsakligen far ett fordon. Dock inser fackmannen att uppfinningen kan implementeras och utnyttjas i vasentligen alla enheter vilka har ett motorsystem, sasom exempelvis fartyg eller flygande farkoster. According to various embodiments of the present invention, the process of the present invention may be repeated for different values of the initial industry M -pred and / or different values of ambient parameters which may affect the injection, thereby further increasing the reliability and accuracy of the assay of the present invention. The invention will be further elucidated below with reference to the accompanying drawings, in which like reference numerals are used for like parts, and in: Figures 1a-b schematically show examples of torque / speed in an engine for injection means having the same and different properties, respectively. Figure 2 shows an exemplary vehicle in which the present invention can be implemented, Figure 3 shows a flow chart of the method according to the present invention, Figure 4 shows a control unit according to the present invention. Description of Preferred Embodiments In this document, the present invention is mainly exemplified and described for a vehicle. However, those skilled in the art will appreciate that the invention may be implemented and utilized in substantially all units which have an engine system, such as, for example, ships or flying craft.

Figur 2 visar schematiskt ett exempelfordon 100, vilken kan innefatta foreliggande uppfinning. Fordonet 100, vilket kan vara en personbil, en lastbil, en buss, eller ett annat fordon, innefattar en drivlina, vilken formedlar kraft till drivhjul 110, 111 i fordonet 100. Drivlinan innefattar en farbranningsmotor 101, vilken pa ett sedvanligt satt, via en pa forbranningsmotorn 101 utgaende axel 102, Or farbunden med en vaxellada 103 via en koppling 106. Naturligtvis kan fordonets drivlina Oven vara av annan typ, sasom av en typ med konventionell automatvaxellada, av en typ med hybriddrivlina, etc. 6 537 277 FOrbranningsmotorn 101 drivs av bransle, vilket tillhandahAlls av ett branslesystem 120 innefattande bland annat en eller flera brOnsletankar och anordningar 121 vilka transporterar branslet tram bransletankarna till motorn 101, samt ett bransleinsprutningssystem 130 vilket är anordnat att spruta in bransle i motorns cylindrar med ett antal N insprutningsorgan 131_13N, day-. N exempelvis kan vara talet 5, 8, 12, eller ett annat lampligt tal for antalet cylindrar i motorn 101. Anordningarna for bransletransport 121 visas har mycket schematiskt, men kan innefatta exempelvis en eller flera ledningar for transport av branslet mom fordonet, en eller flera pumpar, vilka kan vara indelade i lag- respektive hagtryckskretsar, filter, kopplingar, och andra anordningar far bransletransport. Forbranningsmotorn 101 styrs av fordonets styrsystem via en styrenhet 140, vilken illustreras schematiskt i figur 2. Branslesystemet 120 styrs av fordonets styrsystem via en styrenhet 140, vilken i figur 2 schematiskt illustreras som samma styrenhet som styr farbranningsmotorn 101, men vilken Oven kan vara anordnad separat fran denna styrenhet 140. Figure 2 schematically shows an exemplary vehicle 100, which may include the present invention. The vehicle 100, which may be a passenger car, a truck, a bus, or another vehicle, includes a driveline which conveys power to drive wheels 110, 111 in the vehicle 100. The driveline comprises a combustion engine 101, which in a conventional manner, via a On the shaft 102 of the internal combustion engine 101, Or is connected to a gearbox 103 via a coupling 106. Of course, the vehicle's driveline may also be of another type, such as a conventional automatic gearbox type, of a hybrid driveline type, etc. 6 537 277 The internal combustion engine 101 is driven of fuel, which is provided by a fuel system 120 comprising, inter alia, one or more fuel tanks and devices 121 which transport the fuel tram fuel tanks to the engine 101, and a fuel injection system 130 which is arranged to inject fuel into the engine cylinders with a number N of injection means 131_13N, day -. N may be, for example, the number 5, 8, 12, or another appropriate number for the number of cylinders in the engine 101. The devices for fuel transport 121 shown are very schematic, but may include for example one or more lines for transporting the fuel in the vehicle, one or more pumps, which can be divided into legal and high-pressure circuits, filters, couplings, and other devices for industrial transport. The internal combustion engine 101 is controlled by the vehicle control system via a control unit 140, which is schematically illustrated in Figure 2. The fuel system 120 is controlled by the vehicle control system via a control unit 140, which is schematically illustrated in Figure 2 as the same control unit that controls the combustion engine 101, but which may be arranged separately. from this control unit 140.

Styrenheten 140 enligt foreliggande uppfinning innefattar Oven en forsta 141, andra 142 och en tredje 143 faststallandeenhet och en justeringsenhet 144, och Or ansluten Atminstone till motorn 101 och till branslesystemet 120. De forsta 141, andra 142 och tredje 143 faststallandeenheterna och justeringsenheten 144 beskrivs mer i detalj nedan. De forsta 141, andra 142 och tredje 143 faststallandeenheterna illustreras i figur 2 som enskilda enheter. Dock kan funktionerna fOr dessa enheter Oven implementeras i fOrre enheter, exempelvis i en och samma enhet, vilket inses av en fackman. Styrenheten 140 kan vara innefattad i, eller 7 537 277 samarbeta med, en EMS-krets (Engine Management System) i fordonet. The control unit 140 according to the present invention also comprises a first 141, second 142 and a third 143 determining unit and an adjusting unit 144, and is connected at least to the motor 101 and to the fuel system 120. The first 141, second 142 and third 143 determining units and the adjusting unit 144 are described in more detail. in detail below. The first 141, second 142 and third 143 fixing units are illustrated in Figure 2 as individual units. However, the functions for these units can also be implemented in previous units, for example in one and the same unit, as will be appreciated by a person skilled in the art. The control unit 140 may be included in, or collaborate with, an EMS (Engine Management System) circuit in the vehicle.

En fran vaxelladan 103 utgaende axel 107 driver drivhjulen 110, 111 via en slutvaxel 108, sasom t.ex. en sedvanlig differential, och drivaxlar 104, 105 farbundna med ndmnda slutvaxel 108. A shaft 107 emanating from the gearbox 103 drives the drive wheels 110, 111 via an end shaft 108, such as e.g. a conventional differential, and drive shafts 104, 105 connected to said end shaft 108.

Avgaser skapade av motorn 101 vid dess forbranning av brdnslet renas av ett avgasbehandlingssystem 150 innan de slapps ut ur fordonet. Exhaust gases created by the engine 101 during its combustion of the fuel are purified by an exhaust gas treatment system 150 before being discharged from the vehicle.

Figur 3 visar ett flodesschema for farfarande enligt fareliggande uppfinning, dar en analys av en funktion far atminstone ett insprutningsorgan 131_13N far en farbranningsmotor 101 utfars. FOrbrdnningsmotorn 101 innefattar ett antal cylindrar 1_N vilka farses med bransle genom insprutning medelst ett antal insprutningsorgan 131_13N. Figure 3 shows a flow chart of a process according to the present invention, in which an analysis of a function is performed on at least one injection means 131_13N before a combustion engine 101 is performed. The internal combustion engine 101 comprises a number of cylinders 1_N which are ground with fuel by injection by means of a number of injection means 131_13N.

Antalet N cylindrar och insprutningsorgan 131_13N kan har utgoras av ett for en forbramningsmotor godtyckligt lampligt antal. The number of N cylinders and injection means 131_13N may have been a suitable number suitable for an internal combustion engine.

I ett forsta steg 301 av farfarandet enligt fareliggande uppfinning faststdlls en nedvarvningstid TI relaterad till ett sarskilt insprutningsorgan 131. Detta fOrsta steg 301 kan exempelvis utfaras av en farsta faststdllandeenhet 141. Nedvarvningstiden TI motsvarar har den tid det tar far farbrdnningsmotorn 101 att sdnka sitt varvtal co fran ett farsta varvtal col till ett andra ldgre varvtal 02 genom att avbryta insprutningen av brdnsle far alla insprutningsorgan 132_13N farutom det sarskilda insprutningsorganet 131, det vill sdga for alla ytterligare insprutningsorgan 132_13N. Alltsa stoppas insprutningen fran alla ytterligare insprutningsorgan 132_13N, ddr dessa ytterligare insprutningsorgan 132_13N innefattar det totala antalet 8 537 277 insprutningsorgan utom det sarskilda insprutningsorganet 131. Det sarskilda insprutningsorganet 131 sprutar har in en ursprunglig mangd bransle M —predet Det sarskilda insprutningsorganet benamns har av iiiustrativa skai med figurhanvisningsbeteckningen 131. Dock kan det sarskilda insprutningsorganet 131 utgora viiken som heist av de N insprutningsorganen 131_13N. In a first stage 301 of the process according to the present invention, a deceleration time T1 is determined related to a special injection means 131. This first stage 301 can be carried out, for example, by a first decommissioning unit 141. The deceleration time TI corresponds to the time it takes for the car engine from a first speed col to a second lower speed 02 by interrupting the injection of fuel, all injectors 132_13N except the special injector 131, that is, all additional injectors 132_13N. Thus, the injection is stopped from all the additional injection means 132_13N, since these additional injection means 132_13N comprise the total number of 8 537 277 injection means except the special injection means 131. The special injection means 131 syringes have an original plurality of industry members. with the figure reference numeral 131. However, the special injection means 131 may constitute the fold as lifted by the N injection means 131_13N.

I ett andra steg 302 av forfarandet enligt foreliggande uppfinning faststalls, exempelvis av en andra faststallandeenhet 142, atminstone en ytterligare nedvarvningstid T2_TN, genom en upprepning av det i det fOrsta steget utforda faststallandet av nedvarvningstid, fast har med var och en av de ytterligare insprutningsorganen 132_13N valt som det sarskilda insprutningsorganet. Enligt en utforingsform av foreliggande uppfinning faststalls har nedvarvningstider T2_TN for var och en av de ytterligare insprutningsorganen 132_13N. In a second step 302 of the method according to the present invention, for example by a second fixing unit 142, at least one further deceleration time T2_TN is determined, by repeating the determination of deceleration time in the first step, but with each of the further injection means 132_13N selected as the special injection device. According to one embodiment of the present invention, set-down times have T2_TN for each of the further injection means 132_13N.

Efter det forsta 301 och andra steget 302 av forfarandet har alltsa en forsta TI och Atminstone en andra 12_TN nedvarvningstid faststallts. Dessa nedvarvningstider utnyttjas enligt foreliggande uppfinning vid analysen av funktionen far det atminstone ett insprutningsorganet 131_13N. Thus, after the first 301 and second steps 302 of the process, a first TI and at least a second 12_TN deceleration time have been determined. These downtimes are utilized in accordance with the present invention in the analysis of the function provided by at least one injector 131_13N.

Enligt foreliggande uppfinning ska justerings- och faststallandesteg utfOras om atminstone en nedvarvningstid av de faststallda nedvarvningstiderna Tl_TN avviker fran ett nedvarvningstidsintervall Tpredet 1•••Tpredet N fOr motsvarande insprutningsorgan. Respektive nedvarvningstidsintervall Tpredet 1.••Tpredet N ar bar relaterat till den ursprungliga mangden Mpredet bransle vilken tillfars respektive cylinder av de respektive insprutningsorganen 131_13N. Ants& kan har en eller flera avvikande nedvarvningstider Tl_TN identifieras, om 9 537 277 sadana finns, varefter nedan beskrivna justerings- och faststallandesteg utfors for vart och ett insprutningsorgan som bar en sadan avvikande nedvarvningstid. According to the present invention, adjustment and fixing steps are to be performed if at least one deceleration time of the fixed deceleration times T1_TN deviates from a deceleration time interval Tpredet 1 ••• Tpredet N for corresponding injection means. Respective deceleration time intervals Tpredet 1. •• Tpredet N ar bar related to the original amount Mpredet industry which is supplied to the respective cylinder by the respective injection means 131_13N. Ants & can have one or more deviating deceleration times Tl_TN are identified, if there are 9,537,277 such, after which the adjustment and fixing steps described below are performed for each injection means which carried such a deviating deceleration time.

Enligt en utforingsform av uppfinningen utgor nedvarvningstidsintervallet Tpredet 1...Tpredet N ett intervall Tmean interval kring en medelnedvarvningstid 'mean for de faststdllda nedvarvningstiderna TLTN. Enligt en annan utforingsform utgor nedvarvningsintervallet Tpreded i—Teredet N ett far respektive insprutningsorgan 131_13N nominellt nedvarvningsintervall Tnominal 1_ Tnominal N• I ett tredje steg 303 av farfarandet enligt fareliggande uppfinning justeras den ursprungliga mdngden m —predet brdnsle som sprutas in i cylindrarna av insprutningsorganen 131_13N. Denna justering sker i enlighet med en iterativ algoritm till dess att en justerad avvikande nedvarvningstid Tadjust 1•••Tadjdst N far respektive insprutningsorgan fir nedvarvningstidsintervallet Tpredet 1—Tpredet N; Tadjust 1—Tadjust N—Tpredet 1—Tpredet N• I ett fjdrde steg 404 av fOrfarandet enligt foreliggande uppfinning faststdlls en justerad mdngd M —adjust 1.-Madjust N brdnsle, vilken är relaterad till den justerade nedvarvningstiden Tadjuat•••Tadjust N• Alltsa faststdlls hdr den justerade mdngd Madjust 1.-Madjust N brdnsle fOr respektive cylinder vilken gOr att den justerade avvikande nedvarvningstiden Tadjust i_TaaitIst N far respektive insprutningsorgan nar respektive nedvarvningstidsintervall Tpredet 1.••Tpredet Tadjust 1—Tadjust N—Tpredet I—Tpredet N• Den justerade mdngd Madjust 1.-Madjust N brdnsle far respektive cylinder, vilken erhalls genom utnyttjande av fOreliggande uppfinning, kan sedan utnyttjas far diagnos av atminstone ett av insprutningsorganen 131_13N. Vid denna diagnos kan faststdllas om en eller flera av insprutningsorganen 131_13N 10 537 277 har en undermalig funktion. Alltsa kan defekta insprutningsorgan identifieras genom analysen enligt fOreliggande uppfinning. Denna identifiering dr snabb, exakt och robust, och kan ge en snabb indikation pd am ndgot, och sa fall vilket, insprutningsorgan bor bytas ut i brInsleinsprutningssystemet 130. Eftersom justerade mdngder Madjust 1.-Madjust N brdnsle for respektive cylinder erhalls genom farfarandet enligt foreliggande uppfinning per analysen en heltdckande indikation for vart och ett av insprutningsorganen 131_13N, vilket gar att eventuellt defekta insprutningsorgan enkelt och med hog precision kan identifieras. According to an embodiment of the invention, the deceleration time interval Tpredet 1 ... Tpredet N is an interval Tmean interval around an average deceleration time 'mean for the fixed deceleration times TLTN. According to another embodiment, the deceleration interval Tpreded i — Teredet N is a father and injection means 131_13N nominal deceleration interval Tnominal 1_ Tnominal N, respectively. This adjustment takes place in accordance with an iterative algorithm until an adjusted deviating deceleration time Tadjust 1 ••• Tadjdst N far the respective injection means for the deceleration time interval Tpredet 1 — Tpredet N; Tadjust 1 — Tadjust N — Tpredet 1 — Tpredet N • In a fourth step 404 of the process of the present invention, an adjusted amount of M —adjust 1.-Madjust N fuel is determined, which is related to the adjusted deceleration time Tadjuat ••• Tadjust N • Thus, the adjusted amount of Madjust 1.-Madjust N fuel for each cylinder is determined, which means that the adjusted deviating deceleration time Tadjust i_TaaitIst N is the respective injection means when the respective deceleration time interval Tpredet 1. •• Tpredet Tadjust 1 — Tadjust N — Tadjust N — The adjusted amount of Madjust 1.-Madjust N fuel for each cylinder, which is obtained by utilizing the present invention, can then be used for diagnosis by at least one of the injection means 131_13N. In this diagnosis it can be determined whether one or more of the injection means 131_13N 10 537 277 has a substandard function. Thus, defective injection means can be identified by the assay of the present invention. This identification is fast, accurate and robust, and can give a quick indication of something, and if so, the injection means should be replaced in the fuel injection system 130. Since adjusted amounts of Madjust 1.-Madjust N fuel for each cylinder are obtained by the procedure of the present invention. invention per analysis provides a comprehensive indication for each of the injection means 131_13N, which means that any defective injection means can be easily and with high precision identified.

Hdrigenom kan byten av icke-defekta insprutningsorgan undvikas, vilka har varit relativt vanliga dl tidigare kdnda metoder har utnyttjats, eftersom de tidigare kdnda metoderna tillhandahdller joke tillfarlitliga och inexakta indikationer pd konditionen/tillstdndet for insprutningsorganen. Att byta insprutningsorgan dr kostsamt, vilket gOr att fOreliggande uppfinning kan sdnka drifts- och/eller underhAllskostnaderna far fordonet avsevdrt. In this way, replacements of non-defective injectors can be avoided, which have been relatively common where prior art methods have been utilized, since the prior art methods provide joke reliable and inaccurate indications of the condition / condition of the injectors. Replacing the injection means is costly, which means that the present invention can reduce the operating and / or maintenance costs of the vehicle considerably.

FOreliggande uppfinning kan implementeras i mjukvaran, exempelvis i styrenheten 140, vilket gar att bidraget till fordonets komplexitet och/eller tillverkningskostnad blir mycket litet. The present invention can be implemented in the software, for example in the control unit 140, which means that the contribution to the vehicle's complexity and / or manufacturing cost is very small.

Enligt en utfOringsform av foreliggande uppfinning bedOms det sdrskilda insprutningsorganet 131 vara defekt om dess justerade mdngd Madjust 1••• adjust N brdnsle skiljer sip fran motsvarande ursprungliga mdngd Mpredet med mer eller lika med den ursprungliga mdngden Mpredet multiplicerad med en faktor k; Madjust 1.-Madjust NMpredetk*Mpredetr ddr k>0. Faktorn k kan hdr ants& anta olika vdrden som dr stOrre In noll; k>0. 11 537 277 Tabell 1 nedan visar ett icke-begransande exempel pA hur denna bedomning av insprutningsorganen kan se ut for en motor med 5 cylindrar; N=5. Har är den ursprungliga mangden bransle Mpredet 10 mg/slag och faktorn k är 0.5, vilket gor att den justerade mangden M -adjust 1.-Madjust N fAr skilja sig frAn den ursprungliga mangden bransle M -predet med 5 mg/slag (k*Mpredet- 0.5*10=5). According to an embodiment of the present invention, the special injection means 131 is judged to be defective if its adjusted amount Madjust 1 ••• adjust N fuel differs sip from the corresponding original amount Mpredet by more or equal to the original amount Mpredet multiplied by a factor k; Madjust 1.-Madjust NMpredetk * Mpredetr ddr k> 0. The factor k can hdr ants & assume different values that dr StOrre In zero; k> 0. Table 1 below shows a non-limiting example of what this assessment of the injection means may look like for an engine with 5 cylinders; N = 5. The original amount of fuel Mpredet is 10 mg / stroke and the factor k is 0.5, which means that the adjusted amount of M -adjust 1.-Madjust N may differ from the original amount of bran M -predet by 5 mg / stroke (k * Mpredet- 0.5 * 10 = 5).

Insprutningsorgan 1 2 3 4 14preth,t.[mg/slag] k 0.0.0.0.0.Injection means 1 2 3 4 14preth, t. [Mg / stroke] k 0.0.0.0.0.

Madjust[mg/slag] 8 12 Funktion Ok Ok Ok Ok Defekt Tabell 1 Sasom framgar av tabell 1 bedams enligt detta exempel insprutningsorganen 131, 132, 133, 134 for fyra av cylindrarna vara funktionsdugliga; eftersom -adjust 1Mpreaet - 2 0 , Madjust 2 — Mpredet = 0 0 ,Madjust 3 - Mpredet = 2 0 5, och Madjust 4 - Mpredet = 0 0 5; medan ett insprutningsorgan 135 bedoms vara defekt; eftersom IM -adjust 5 - Mpredet = 5. Madjust [mg / stroke] 8 12 Function Ok Ok Ok Ok Defective Table 1 As can be seen from Table 1, according to this example, the injection means 131, 132, 133, 134 for four of the cylinders are judged to be functional; since -adjust 1Mpreaet - 2 0, Madjust 2 - Mpredet = 0 0, Madjust 3 - Mpredet = 2 0 5, and Madjust 4 - Mpredet = 0 0 5; while an injection means 135 is judged to be defective; since IM -adjust 5 - Mpredet = 5.

Naturligtvis kan motsvarande tabell stallas upp far vasentligen alla godtyckliga lampliga antal cylindrar en farbranningsmotor kan ha, samt for godtyckliga lampliga varden pa Mpredet och faktorn k. Of course, the corresponding table can be set up for essentially any arbitrary suitable number of cylinders a combustion engine may have, as well as for any arbitrary suitable value of Mpredet and the factor k.

Tabeller motsvarande tabell 1 kan beraknas i farvag och lagras i styrenheten 140, varigenom en mycket snabb och tillfarlitlig diagnos av insprutningsorganen kan erhAllas. Tables corresponding to Table 1 can be calculated in color and stored in the control unit 140, whereby a very fast and reliable diagnosis of the injection means can be obtained.

Enligt en utforingsform av foreliggande uppfinning upprepas farfarandet far analys av en funktion fOr Atminstone ett 12 537 277 insprutningsorgan 131_13N for olika varden fOr den ursprungliga branslemangden M —predet • Alltsa upprepas de forsta 301, andra 302, tredje 303 och fjarde 304 stegen beskrivna i anslutning till figur 3 for olika branslemangder M —predet • Ear kan exempelvis analysen enligt forfarandet forst utforas for en till var och en cylinder relativt mindre tillford branslemangd, exempelvis cirka 10 mg insprutat bransle per slag, varvid justerade mangder M —adjust 1•••Madjustbransle for respektive cylinder erhAlls far denna relativt mindre tillforda branslemangd. Sedan kan analysen enligt forfarandet utforas far Atminstone en till var och en cylinder relativt storre tillford ursprunglig branslemangd M —predet r exempelvis cirka 20 mg insprutat bransle per slag, majligtvis foljt av en eller flera ytterligare relativt storre tillfOrda branslemangder Mpredet, varvid justerade mangder M —adjust 1••• adjust Id bransle for respektive cylinder erhalls for denna atminstone en relativa starre tillforda branslemangd. According to an embodiment of the present invention, the procedure is repeated for analyzing a function of at least one injection means 131_13N for different values for the original industry quantity M - the boiler. Thus, the first 301, second 302, third 303 and fourth 304 steps described in connection are repeated. to Figure 3 for different industry quantities M —predet • Ear, for example, the analysis according to the procedure can first be performed for a to each cylinder relatively smaller feed quantity, for example about 10 mg injected industry per type, whereby adjusted quantities M —adjust 1 ••• Food adjustment industry for each cylinder, this relatively small amount of fuel is obtained. Then the analysis according to the procedure can be carried out for at least one cylinder each larger relative to the original amount of fuel M —pred is, for example, about 20 mg of injected fuel per stroke, possibly followed by one or more further relatively supplied amounts of fuel Mpred, with adjusted amounts M - adjust 1 ••• adjust Id industry for each cylinder is obtained for this at least a relatively rigid supply industry quantity.

Genom att utfora analysen enligt foreliggande uppfinning for flera varden pa den ursprungliga branslemangden M —predet kan olinjariteter i fOrhAllandet mellan en av bransle/insprutnings-systemet begard branslemangd och en faktisk insprutad branslemangd kompenseras for. Alltsa Okar tillfarlitligheten och exaktheten ytterligare fOr analysen enligt foreliggande uppfinning om den upprepas for olika varden pA den ursprungliga branslemangden Mpredet. By performing the analysis according to the present invention for several values of the original industry quantity M -predet, nonlinearities in the relationship between a industry quantity requested by the industry / injection system and an actual injected industry quantity can be compensated for. Thus, the reliability and accuracy further increase for the assay of the present invention if it is repeated for different values of the original industry quantity Mpredet.

Enligt en utfOringsform av foreliggande uppfinning ingar analysen av insprutningsorganens 131_13N funktion i ett verkstadstest. According to an embodiment of the present invention, the analysis of the function of the injection means 131_13N in a workshop test.

Enligt en utfaringsform av foreliggande uppfinning utfars analysen, vilken kan ingd i evan namnda verkstadstest, nar fordonet 100 Or stillastdende och cid farbrdnningsmotorn 101 Or 13 537 277 frikopplad fran en drivlina i fordonet 100, exempelvis genom att en neutral vaxel valts i vaxelladan 103, eller att kopplingen 106 dr Oppen. According to an embodiment of the present invention, the analysis, which may be included in the workshop test referred to above, is carried out when the vehicle 100 is stationary and the combustion engine 101 Or 13 537 277 is disengaged from a driveline in the vehicle 100, for example by selecting a neutral gear in gearbox 103, or that the coupling 106 dr Oppen.

Alltsa kan, enligt en utforingsform av foreliggande uppfinning, analysen av insprutningsorganens 131_13N funktion exempelvis utnyttjas av en verkstad innan de byter ut ett eller flera insprutningsorgan fOr att sakerstalla att just det eller de insprutningsorgan som är defekta byts ut, och att val fungerande insprutningsorgan inte byts ut. Harigenom kan stora besparingar goras for fordonsagaren/fordonsbrukaren. Dessutom minimeras risken far att fordonet pa grund av bristfallig analys i onodan star still i en verkstad istallet for att i drift. Thus, according to an embodiment of the present invention, the analysis of the function of the injectors 131_13N may be used, for example, by a workshop before replacing one or more injectors to ensure that the particular injector or injectors that are defective are replaced, and that selectable injectors are not replaced. out. As a result, large savings can be made for the vehicle sawmill / vehicle user. In addition, the risk of the vehicle standing still in a workshop instead of being in operation due to inadequate analysis is minimized.

Enligt en utforingsform av fareliggande uppfinning utnyttjas analysen av insprutningsorganens 131_13N funktion fOr korrektion av atminstone ett av insprutningsorganen 131_13N. Ear kan alltsa de vid analysen faststallda justerade mangderna Madjust 1.-Madjust N bransle for respektive cylinder utnyttjas for att basera en justering/adaption av ett eller flera av insprutningsorganen 131_13N pa. Efter att en eller flera justeringar/adaptioner av ett eller flera av insprutningsorganen 131_13N har utforts kan sedan analysen av insprutningsorganens 131_13N funktion upprepas for att se vilken inverkan justeringen/adaptionen hade pa insprutningsorganens 131_13N funktion. Alltsa kan enligt denna utforingsform ett ojamnt moment fran motorn 101 kompenseras far genom justering/adaption av ett eller flera av insprutningsorganen 131_13N, dar denna justering/adaption baseras pa analysen av insprutningsorganens 131_13N funktion enligt foreliggande uppfinning. Harigenom kan i vissa fall ett byte av ett eller flera insprutningsorgan undvikas, eftersom 14 537 277 mindre avvikande egenskaper has insprutningsorganen kan kompenseras for genom sddan justering/adaption. According to an embodiment of the present invention, the analysis of the function of the injection means 131_13N is used for correcting at least one of the injection means 131_13N. Thus, the adjusted amounts of Madjust 1.-Madjust N fuel for each cylinder determined during the analysis can be used to base an adjustment / adaptation of one or more of the injection means 131_13N on. After one or more adjustments / adaptations of one or more of the injection means 131_13N have been made, the analysis of the function of the injection means 131_13N can then be repeated to see what effect the adjustment / adaptation had on the function of the injection means 131_13N. Thus, according to this embodiment, an uneven torque from the engine 101 can be compensated for by adjusting / adapting one or more of the injectors 131_13N, this adjustment / adaptation being based on the analysis of the function of the injectors 131_13N according to the present invention. As a result, in some cases a change of one or more injection means can be avoided, since 14 537 277 less deviating properties of the injection means can be compensated for by such an adjustment / adaptation.

Analysen enligt fareliggande uppfinning kan vidare utnyttjas for diagnos och/eller korrektion, det viii saga justering/adaption, av dtminstone ett av insprutningsorganen 131_13N, ddr valet av am diagnos eller korrektion ska utforas beror av hur mycket den justerade mdngden Madjust 1- adj,st N bransle skiljer sig frdn respektive ndmnda ursprungliga mangd Mpredet • Enligt en utfOringsform korrigeras det sdrskilda insprutningsorganet 131 am den justerade mdngden M -adjust 1•••Madjust N brdnsle skiljer sig Iran den ursprungliga mdngden M -uredet brdnsle med mindre an eller lika med den ursprungliga mdngden Mpredet brdnsle multiplicerad med en forsta faktor kl; Madjust 1-Madjust NMpredetkl*Mpredet • stOrre an nail; k1>0. The assay according to the present invention can further be used for diagnosis and / or correction, the viii saga adjustment / adaptation, of at least one of the injection means 131_13N, where the choice of am diagnosis or correction is to be made depends on how much the adjusted amount Madjust 1- adj, st When the fuel industry differs from the respective mentioned original quantity Mpredet • According to one embodiment, the special injection means 131 am corrected by the adjusted amount M -adjust 1 ••• Madjust In fuel, Iran differs from the original amount M -reduced fuel by less than or equal to the original amount Mpredet fuel multiplied by a first factor at; Madjust 1-Madjust NMpredetkl * Mpredet • stOrre an nail; k1> 0.

Om istdllet den justerade mdngden M -adjust 1-Madjusu N brdnsle skiljer sig fran den ursprungliga mdngden Mpredet brdnsle med mer an eller lika med den ursprungliga mdngden Mpredet brdnsle multiplicerad med en andra faktor k2; I Madjust 1•••Madjust NMpredet k2*Mpredet ; bedoms istdllet det sdrskilda insprutningsorganet 131 som defekt, vilket innebdr att byte av detta sdrskilda insprutningsorgan forordas. Den andra faktorn k2 är stOrre an den fOrsta faktorn kl, och är ddrmed ocksa den stOrre an noll; k2>k1>0. If the set amount is the adjusted amount M -adjust 1-Madjusu N fuel differs from the original amount Mpredet fuel by more than or equal to the original amount Mpredet fuel multiplied by a second factor k2; I Madjust 1 ••• Madjust NMpredet k2 * Mpredet; instead, the special injection means 131 is judged to be defective, which means that replacement of this special injection means is recommended. The second factor k2 is greater than the first factor kl, and is therefore also greater than zero; k2> k1> 0.

Enligt ett icke-begramsande exempel kan den forsta faktorn kl ha vdrdet 0.2 och den andra faktorn k2 kan ha vdrdet 0.4. Vdrdena fOr dessa faktorer beror av storleken pA de aktuella brdnslemdngderna. According to a non-limiting example, the first factor k1 may have the value 0.2 and the second factor k2 may have the value 0.4. The values for these factors depend on the size of the actual fuel sluices.

Denna farsta faktor kl är 537 277 Om den justerade mdngden M —adjust 1—Madjust N brdnsle skiljer sig fran den ursprungliga mangden M —predet bransle med ett varde som ligger mellan vdrdena for den forsta faktorn k1 och den andra faktorn k2, utfors enligt en utforingsform en korrektion upp till vdrdet far den farsta faktorn k1. Har hegransas korrektionen till ett omrade mom vilket en robust och kontrollerad korrektion sdkert kan utfaras fOr att minska risken for att korrektionen gar med skada an nytta. Enligt en utfaringsform av foreliggande uppfinning innefattar den iterativa algoritmen, vilken utnyttjas vid analysen enligt uppfinningen far att faststdllda den justerade branslemdngden Madjust 1.-Madjust Nr en bisektionsmetod. This first factor at is 537 277 If the adjusted amount M —adjust 1 — Madjust N fuel differs from the original amount M —pred fuel with a value that lies between the values of the first factor k1 and the second factor k2, is performed according to a embodiment a correction up to the value gets the first factor k1. Does the right have the correction to an area mom which a robust and controlled correction can certainly be carried out to reduce the risk that the correction will be harmful to benefit. According to an embodiment of the present invention, the iterative algorithm used in the analysis according to the invention comprises determining the adjusted industry length Madjust 1.-Madjust No. a bisection method.

Bisektionsmetoden kan ses som en iterativ intervallhalveringsmetod. Enligt bisektionsmetoden utfors i ett farsta steg en forsta fordndring av den ursprungliga mangden M —predet bransle och sedan analyseras vilken inverkan denna forsta fardndring av den ursprungliga mangden Mp redet bransle bar pa den justerade nedvarvningstiden Sedan utfars i dtminstone ett andra efterfaljande steg en halvering av den faregaende farandringen av den ursprungliga mdngden M —predet brdnsle. Konsekutiva halveringar av faregaende farandringar av den ursprungliga mangden M —predet bransle utfOrs sedan till dess att den justerade nedvarvningstiden Tadjust 1•••Tadjust N hamnar mom nedvarvningstidsintervallet Tpredet 1—Tpredet N; Tadjitst 1.-Tadjust N=Tpredet 1—Tpredet N • Sasom beskrivs ovan utgor i detta dokument Tpredet 1•••Tpredet N intervall i tiden far nedvarvningstider for respektive insprutningsorgan/cylinder. The bisection method can be seen as an iterative interval halving method. According to the bisection method, in a first step a first change of the initial amount of the M-prepared industry is performed and then the effect of this first change of the original amount of the prepared industry on the adjusted deceleration time is performed. In at least a second subsequent step a halving of the dangerous change of the original quantity M —predet fuel. Consecutive halves of hazardous changes of the original amount of the M —predet branch are then performed until the adjusted deceleration time Tadjust 1 ••• Tadjust N ends up with the deceleration time interval Tpredet 1 — Tpredet N; Tadjitst 1.-Tadjust N = Tpredet 1 — Tpredet N • As described above, Tpredet 1 ••• Tpredet N is the interval in time for downtimes for each injection means / cylinder.

Bisektionsmetoden är en robust numerisk ekvationslasningsmetod, vilken alltid konvergerar am lasningen djustad just N • 16 537 277 finns i det undersakta intervallet, och vilken kan implementeras med litet tillskott i komplexitet. The bisection method is a robust numerical equation lasing method, which always converges the lasing depth just N • 16 537 277 is in the investigated interval, and which can be implemented with a small addition in complexity.

Enligt en utfaringsform av foreliggande uppfinning innefattar den iterativa algoritmen, vilken utnyttjas vid analysen enligt uppfinningen far att faststalla den justerade mangden Madjust 1.-Madjust Nr en sekantmetod. According to an embodiment of the present invention, the iterative algorithm used in the analysis according to the invention comprises determining the adjusted amount of Madjust 1.-Madjust No. a secant method.

Sekantmetoden utnyttjar en eller flera sekantlinjer far att farandra den ursprungliga mangden M —predet bransle till dess att den justerade nedvarvningstiden Taaiust 1...Tadjust N hamnar mom nedvarvningstidsintervallet Tpredet 1.-Tpredet N; Tadjust 1—'adjust N—Tpredet I—Tpredet N • Sekantmetoden konvergerar ofta snabbare an bisektionsmetoden och kan implementeras med litet tillskott i komplexitet. Dock kan konvergens inte alltid garanteras for sekantmetoden. The secant method uses one or more secant lines to move the original amount of the M —pred branch until the adjusted deceleration time Taaiust 1 ... Tadjust N ends up with the deceleration time interval Tpredet 1.-Tpredet N; Tadjust 1 —'adjust N — Tpredet I — Tpredet N • The secant method often converges faster than the bisection method and can be implemented with a small addition in complexity. However, convergence can not always be guaranteed for the secant method.

Fackmannen inser att aven andra ekvationslasningsalgoritmer kan utnyttjas for att justera den ursprungliga mangden M —predet bransle sd att motsvarande justerade avvikande nedvarvningstid Tadjust 1•••Tadjust N for insprutningsorganet styrs mot nedvarvningstidsintervallet Tpredet 1•••Tpredet N • Faretradesvis kan robusta numeriska ekvationslosningsalgoritmer utnyttjas for att hitta den justerade mangden Madi Bransleinsprutningssystemet 130, insprutningsorganen 131_13N och deras funktion kan aven pdverkas av en eller flera omgivningsparametrar. Those skilled in the art will appreciate that other equation welding algorithms may also be used to adjust the initial amount of M -pread industry so that the corresponding adjusted deviating deceleration time Tadjust 1 ••• Tadjust N of the injection means is controlled against the deceleration time interval. to find the adjusted amount of the Madi fuel injection system 130, the injection means 131_13N and their function can also be affected by one or more ambient parameters.

En sadan omgivningsparameter utgor ett tryck P vilket branslet som tillhandahAlls insprutningsorganen 131_13N har. Aven bransletemperaturen Tfuel hos branslet och/eller dess kemiska sammansattning Kmix kan utgara omgivningsparametrar som kan paverka insprutningen. ust 1—Madjust N • 17 537 277 En annan omgivningsparameter som kan pAverka insprutningen utgors av det antal brAnsleinsprutningar som utfors av insprutningsorganen 131_13N for respektive cylinder under en kompressionstakt och en forbrAnningstakt. I vissa motorer finns mOjlighet att utfora flera, exempelvis tre, insprutningar per slag. Such an ambient parameter constitutes a pressure P which the industry providingAll the injection means 131_13N has. The industry temperature Tfuel in the industry and / or its chemical composition Kmix can also be environmental parameters that can affect the injection. ust 1 — Madjust N • 17 537 277 Another environmental parameter which can affect the injection is the number of fuel injections performed by the injection means 131_13N for each cylinder during a compression stroke and a combustion stroke. In some engines it is possible to perform several, for example three, injections per stroke.

En annan omgivningsparameter utgors av vevvinkeln dl brAnsleinsprutningar utforda av insprutningsorganen 131_13N ska starta. Aven ett vevvinkelintervall mellan starter av tvA efter varandra foljande brAnsleinsprutningar utforda av insprutningsorganen 131_13N kan utgara en sAdan omgivningsparameter. Another environmental parameter is the crank angle dl fuel injections challenged by the injection means 131_13N are to start. Even a crank angle range between starts of two consecutive fuel injections challenged by the injection means 131_13N can constitute such an ambient parameter.

Enligt en utfaringsform av foreliggande uppfinning upprepas forfarandet for analysen, det viii saga stegen beskrivna i anslutning till figur 3, far olika varden far en eller flera av de ovan nOmnda omgivningsparametrarna. Eftersom dessa omgivningsparametrar kan pAverka funktionen far ett eller flera av insprutningsorganen 131_13N, och Oven pA olika sOtt, resulterar upprepningen av forfarandet for dessa olika varden i en Onnu mer tillforlitlig och exakt analys. According to an embodiment of the present invention, the procedure for the analysis is repeated, the seven steps described in connection with Figure 3, having different values for one or more of the above-mentioned environmental parameters. Since these environmental parameters can affect the function of one or more of the injection means 131_13N, and even in different ways, the repetition of the procedure for these different values results in an even more reliable and accurate analysis.

AlltsA faststalls olika adaptioner/korrektioner baserat pA olika vArden far omgivningsparametrarna. Exempelvis faststalls en adaption som Or lamplig vid lAgt bransletryck P och en annan adaption som Or lOmplig vid hogt brOnsletryck P. PA motsvarande satt kan olika adaptioner/korrektioner faststallas far olika vOrden p& de ovan namnda andra omgivningsparametrarna. Thus, different adaptations / corrections based on different values are determined by the environmental parameters. For example, one adaptation is found to be suitable for low fuel pressure P and another adaptation to be suitable for high fuel pressure P. In different ways, different adaptations / corrections can be determined for different values of the above-mentioned other environmental parameters.

Fackmannen inser att ett farfarande far analys av en funktion far Atminstone ett insprutningsorgan i en farbranningsmotor enligt foreliggande uppfinning dessutom kan implementeras i ett datorprogram, vilket nar det exekveras i en dator 18 537 277 astadkommer att datorn utfar farfarandet. Datorprogrammet utgor vanligtvis en del av en datorprogramprodukt 403, dar datorprogramprodukten innefattar ett ldmpligt digitalt lagringsmedium pa vilket datorprogrammet är lagrat. Namnda datorldsbara medium bestar av ett ldmpligt minne, sasom exempelvis: ROM (Read-Only Memory), PROM (Programmable Read-Only Memory), EPROM (Erasable PROM), Flash-minne, EEPROM (Electrically Erasable PROM), en harddiskenhet, etc. Those skilled in the art will appreciate that a procedure for analyzing a function at least one injection means in a combustion engine according to the present invention may additionally be implemented in a computer program, which when executed on a computer causes the computer to perform the procedure. The computer program usually forms part of a computer program product 403, wherein the computer program product comprises a suitable digital storage medium on which the computer program is stored. Said computer-recordable medium consists of a readable memory, such as: ROM (Read-Only Memory), PROM (Programmable Read-Only Memory), EPROM (Erasable PROM), Flash memory, EEPROM (Electrically Erasable PROM), a hard disk drive, etc .

Figur 4 visar schematiskt en styrenhet 400. Styrenheten 400 innefattar en berakningsenhet 401, vilken kan utgaras av vdsentligen nagon ldmplig typ av processor eller mikrodator, t.ex. en krets for digital signalbehandling (Digital Signal Processor, DSP), eller en krets med en forutbestdmd specifik funktion (Application Specific Integrated Circuit, ASIC). Figure 4 schematically shows a control unit 400. The control unit 400 comprises a computing unit 401, which can be made of substantially any suitable type of processor or microcomputer, e.g. a Digital Signal Processor (DSP), or an Application Specific Integrated Circuit (ASIC).

Berdkningsenheten 401 är farbunden med en, i styrenheten 400 anordnad, minnesenhet 402, vilken tillhandahaller berdkningsenheten 401 t.ex. den lagrade programkoden och/eller den lagrade data berakningsenheten 401 behover for att kunna utfora berdkningar. Berdkningsenheten 401 är dven anordnad att lagra del- eller slutresultat av berakningar i minnesenheten 402. The storage unit 401 is connected to a memory unit 402 arranged in the control unit 400, which provides the storage unit 401 e.g. the stored program code and / or the stored data calculation unit 401 need to be able to perform calculations. The calculating unit 401 is then arranged to store partial or final results of calculations in the memory unit 402.

Vidare är styrenheten 400 forsedd med anordningar 411, 412, 413, 414 far mottagande respektive sdndande av in- respektive utsignaler. Dessa in- respektive utsignaler kan innehalla vagformer, pulser, eller andra attribut, vilka av anordningarna 411, 413 for mottagande av insignaler kan detekteras som information och kan omvandlas till signaler som kan behandlas av berakningsenheten 401. Dessa signaler tillhandahalls sedan berdkningsenheten 401. Anordningarna 412, 414 for sandande av utsignaler är anordnade att omvandla berdkningsresultat fran berdkningsenheten 401 till utsignaler 19 537 277 for averfaring till andra delar av fordonets styrsystem och/eller den/de komponenter for vilka signalerna är avsedda. Furthermore, the control unit 400 is provided with devices 411, 412, 413, 414 for receiving and transmitting input and output signals, respectively. These input and output signals may contain waveforms, pulses, or other attributes, which of the input signals receiving devices 411, 413 may be detected as information and may be converted into signals which may be processed by the calculating unit 401. These signals are then provided to the calculating unit 401. The devices 412 , 414 for sanding out output signals are arranged to convert bending results from the bending unit 401 to output signals 19 537 277 for experience to other parts of the vehicle control system and / or the component (s) for which the signals are intended.

Var och en av anslutningarna till anordningarna far mottagande respektive sandande av in- respektive utsignaler kan utgoras av en eller flera av en kabel; en databuss, sasom en CAN-buss (Controller Area Network bus), en MOST-buss (Media Orientated Systems Transport bus), eller nagon annan busskonfiguration; eller av en tradlos anslutning. Each of the connections to the devices receiving and transmitting input and output signals, respectively, may be one or more of a cable; a data bus, such as a CAN bus (Controller Area Network bus), a MOST bus (Media Orientated Systems Transport bus), or any other bus configuration; or by a wireless connection.

En fackman inser att den ovan namnda datorn kan utgaras av berakningsenheten 401 och att det ovan namnda minnet kan utgoras av minnesenheten 402. One skilled in the art will appreciate that the above-mentioned computer may be output from the computing unit 401 and that the above-mentioned memory may be provided by the memory unit 402.

Allmant bestar styrsystem i moderna fordon av ett kommunikationsbussystem bestaende av en eller flera kommunikationsbussar far att sammankoppla ett antal elektroniska styrenheter (ECU:er), eller controllers, och olika pd fordonet lokaliserade komponenter. Ett dylikt styrsystem kan innefatta ett stort antal styrenheter, och ansvaret far en specifik funktion kan vara uppdelat pa fler an en styrenhet. Fordon av den visade typen innefattar alltsa ofta betydligt her styrenheter an vad som visas i figur 4, vilket är valkant for fackmannen mom teknikomradet. In general, control systems in modern vehicles consist of a communication bus system consisting of one or more communication buses which can interconnect a number of electronic control units (ECUs), or controllers, and various components located on the vehicle. Such a control system can comprise a large number of control units, and the responsibility for a specific function can be divided into more than one control unit. Vehicles of the type shown thus often comprise significantly more control units than what is shown in Figure 4, which is the choice for the person skilled in the art.

Fareliggande uppfinning är i den visade utfaringsformen implementerad i styrenheten 400. Uppfinningen kan dock Oven implementeras helt eller delvis i en eller flera andra vid fordonet redan befintliga styrenheter eller i nagon far fareliggande uppfinning dedikerad styrenhet. In the embodiment shown, the dangerous invention is implemented in the control unit 400. However, the invention can also be implemented in whole or in part in one or more other control units already existing at the vehicle or in a control unit dedicated to any dangerous invention.

Enligt en aspekt av fareliggande uppfinning tillhandahalls ett system anordnat far analys av en funktion for atminstone ett insprutningsorgan 131_13N i en forbranningsmotor 101. According to one aspect of the present invention, there is provided a system arranged for analysis of a function of at least one injection means 131_13N in an internal combustion engine 101.

Farbranningsmotorn 101 innefattar ett antal cylindrar 1_N 537 277 vilka fOrses med bransle genom insprutning medelst ett antal insprutningsorgan 131_13N. The combustion engine 101 comprises a number of cylinders 1_N 537 277 which are supplied with fuel by injection by means of a number of injection means 131_13N.

Systemet innefattar vidare en fOrsta faststallandeenhet 141, vilken är anordnad for faststallande av en nedvarvningstid T2 relaterad till ett sarskilt insprutningsorgan 131, dar nedvarvningstiden TI motsvarar den tid det tar for farbranningsmotorn 101 att sanka dess varvtal co fran ett forsta varvtal col till ett andra lagre varvtal 02 genom att avbryta insprutning av bransle for alla ytterligare insprutningsorgan 132_13N. De ytterligare insprutningsorganen 132_13N innefattar har alla insprutningsorgan utom det sarskilda insprutningsorganet 131. Det sarskilda insprutningsorganet 131 sprutar har in den ursprungliga mangden bransle M —predet • Systemet innefattar aven en andra faststallandeenhet 142, vilken är anordnad fbr faststallande av atminstone en ytterligare nedvarvningstid T2_TN. Vid detta faststallande av ytterligare nedvarvningstider upprepas faststallandet av nedvarvningstiden med var och en av de ytterligare insprutningsorganen 132_13N som sarskilda insprutningsorgan. The system further comprises a first determining unit 141, which is arranged for determining a deceleration time T2 related to a particular injection means 131, the deceleration time T1 corresponds to the time it takes for the combustion engine 101 to decrease its speed co from a first speed col to a second layer. 02 by interrupting fuel injection for all additional injection means 132_13N. The additional injection means 132_13N comprise have all injection means except the special injection means 131. The special injection means 131 syringes have in the original amount of fuel M - the spreader. The system also comprises a second fixing unit 142, which is arranged for fixing at least one further T at least one T In this determination of additional deceleration times, the determination of the deceleration time is repeated with each of the additional injection means 132_13N as separate injection means.

Enligt fbreliggande uppfinning är en justeringsenhet 144, anordnad att utfbra en justering av den ursprungliga mangden Mpredet bransle vilken tillfars respektive cylinder av respektive insprutningsorgan 131_13N om Atminstone en nedvarvningstid av de faststallda nedvarvningstiderna Tl_TN avviker tram ett nedvarvningstidsintervall Tpredet 1•••Tpredet N f Or motsvarande insprutningsorgan, dar nedvarvningstidsintervallet Tpredet 1.••Tpredet N är relaterat till den ursprungliga mangden M —predet bransle. Justeringen, som utfars av justeringsenheten fOr vart och ett av insprutningsorganen som har en avvikande nedvarvningstid, utfbrs i enlighet med en iterativ algoritm 21 537 277 till dess att en justerad avvikande nedvarvningstid Tadjust 1•••Tadjust N for insprutningsorganet nAr nedvarvningstidsintervallet Tpredet j.„Tpredet N; Tadjust 1—Tadjust N—Tpredet I—Tpredet N• Systemet innefattar aven en tredje faststallandeenhet 143, vilken anordnad for faststallande av den justerade mangd Madjust 1". adjust N bransle som är relaterad till den justerade nedvarvningstiden Tadjust 1...TadjustN som erhAlls genom utnyttjandet av den iterativa algoritmen. According to the present invention, an adjusting unit 144 is arranged to perform an adjustment of the initial amount Mpredet branch which is supplied to the respective cylinder by respective injection means 131_13N if At least one downshift time of the fixed downshift times T1_TN deviates from a downshift time interval injection means, where the deceleration time interval Tpredet 1. •• Tpredet N is related to the original amount M —predet branch. The adjustment, which is performed by the adjusting unit for each of the injectors having a deviating deceleration time, is performed in accordance with an iterative algorithm until an adjusted deviating deceleration time Tadjust 1 ••• Tadjust N of the injector when the deceleration time is reached. Tpredet N; Tadjust 1 — Tadjust N — Tpredet I — Tpredet N • The system also comprises a third fixing unit 143, which is arranged for determining the adjusted amount of Madjust 1 ". Adjust N branch which is related to the adjusted downsizing time Tadjust 1 ... TadjustN obtained through the use of the iterative algorithm.

Systemet enligt fOreliggande uppfinning har samma fOrdelar som ovan beskrivs for forfarandet enligt fOreliggande uppfinning. The system of the present invention has the same advantages as described above for the process of the present invention.

Systemet enligt fOreliggande uppfinning kan anordnas att utfora alla de ovan, och i patentkraven, beskrivna fOrfarandeutfOringsformerna, varvid systemet fOr respektive utforingsform erhAller ovan beskrivna fOrdelar for respektive utfOringsform. The system according to the present invention can be arranged to carry out all the process embodiments described above, and in the claims, the system for each embodiment receiving the above-described advantages for each embodiment.

Fackmannen inser ocksA att systemet ovan kan modifieras enligt de olika utforingsformerna av metoden enligt uppfinningen. Dessutom avser uppfinningen ett motorfordon 100, till exempel en lastbil eller en buss, innefattande Atminstone ett system for analys av en funktion for Atminstone ett insprutningsorgan i en fOrbranningsmotor. Those skilled in the art will also recognize that the above system may be modified according to the various embodiments of the method of the invention. In addition, the invention relates to a motor vehicle 100, for example a truck or a bus, comprising at least one system for analyzing a function of at least one injection means in an internal combustion engine.

FOreliggande uppfinning är inte begransad till de ovan beskrivna utfOringsformerna av uppfinningen utan avser och innefattar alla utforingsformer mom de bifogade sjalvstandiga kravens skyddsomfAng. 22 The present invention is not limited to the above-described embodiments of the invention but relates to and includes all embodiments within the scope of the appended independent claims. 22

Claims

A method for analyzing a function of at least one injection means (131_13N) has an internal combustion engine (101), said combustion engine (101) comprising a number of cylinders (1_N) which are supplied with fuel by injection by means of a number of injection means (131_13N). ); comprising: 1. determining a deceleration time T1 related to a particular injection means (131), wherein said deceleration time T1 corresponds to the time it takes for said combustion engine (101) to decrease the combustion engine speed o from a first speed col to a second lower speed (02 by interrupting said injection of fuel for all further injectors (132_13N), wherein said additional injectors (132_13N) comprise said number of injectors except said special injectors (131); of said deceleration time with each of said additional injection means (132_13N) as said special injection means, characterized in that at least one deceleration time of the determined deceleration times T1_TN deviates from a deceleration time interval Tpredet 1 time interval Tpredet 1-Tpredet N is related to an original amount of M -predet branch which is supplied to each cylinder by said respective injection means (131_13N), the following steps are performed for each injection means having a different downturn time: 3. adjustment according to an iterative algorithm of said initial quantity M -predet branch until an adjusted 23 537 277 deviating deceleration time "'adjust 1 ... Tadjust N for the injection means when said deceleration time interval Tpredet 1-Tpredet N; "'adjust 1. •• T adjust N-Tpredet 1.„ Tpredet N; and 4. determining an adjusted amount of M -adjust 1-Madjust N branch, which is related to the said adjusted deceleration time Tadjust 1 ••• T adjust N A method according to claim 1, wherein said assay is used to diagnose at least one of said number of injection means (131..13N) A method according to claim 2, wherein said particular injection means (131) is judged to be defective if said adjusted amount M -adjust I-Madjust N industry differs from said original quantity M -predet by more or equal to the said original quantity Mpredet multiplied by a factor k; Mad just 1-Madjust NMpreddk * Mpredt is where k> 0. The assay used to correct at least one of said number of injection means (131_13N). The method of claim 1, wherein said assay is used to diagnose and / or correct at least one of said number of injection means (131_13N). A method according to claim 5, wherein said special injection means (131): 1. is corrected by said adjusted amount Madjust 1.-M adjust N fuel differs from said original amount M -predet fuel with less in or equal to said original amount M - predet branch multiplied by a first factor at; 2. M ede <kl * Mpredet; dar k1> 0; and 3. is assessed as defective in the said adjusted quantity M -adjust 1.-Madjulst N branch differs from the said original quantity M --predet Madjtist 1-Madjust N 24 537 277 branch with more in or equal to the said original quantity Mpredet branch multiplied with a second factor k2; Madjust 1.-Madjust NMpredetk2 * Mpredet; dar k2> k1> 0. A method according to any one of claims 1-6, wherein said iterative algorithm comprises a bisection method. A method according to claim 7, wherein said bisection method in a first step makes a first reduction of said initial amount Mpredet industry and analyzes what effect this first change has on said adjusted deceleration time Tadjust ... Tadjust Nr and in at least a second subsequent step halves previously made changes of the said original quantity Mpredet industry until the said adjusted downturn time 'adjust 1 ... Tadjust When the said downturn time interval Tpredet 1 ••• Tpredet N; A method according to any one of claims 1-6, wherein said iterative algorithm comprises a secant method 10. A method according to claim 9, wherein said secant method comprises utilization. of one or more secant lines to change said original mingd M -predet branch until the said adjusted deceleration time 'adjust 1 ••• "adjust N when the said deceleration time interval" predet 1 ••• "predet N; A method according to any one of claims 1-10, wherein said deceleration interval Tgor someone in predet 1 ... Tpredet N Out of the group of: 1. an interval Tmean 'interval around an average deceleration time' mean for said number of deceleration times TL.TN; and 2. a fir according to the respective injection means (131_13N) nominal deceleration interval "norninall_ Tnorninal N" adjust 1- "adjust N-" predet 1- "predet N • 537 277 12. A method according to any one of claims 1-11, wherein said method of analysis of a function for at least one injection means (131_13N) is repeated for different values for one or more ambient parameters which may affect said function 13. A method according to claim 12, wherein said one or more ambient parameters comprises at least one in the group of: 1. a pressure P has said fuel provided to said number of injectors (131_13N); 2. a number of fuel injections challenged by said number of injectors for each cylinder during a compression stroke and a combustion stroke; 3. a crank angle for starting fuel injections challenged by said number of injectors (131_13N); 4 a crank angle range between starts of two consecutive fuel injections performed by said number of injections sealing means; and 5. a fuel temperature T fuel has said fuel supplied to said plurality of injectors (131_13N); and 6. a chemical composition Kffi has named industry. A method according to any one of claims 1-13, wherein said method for analyzing a function has at least one injection means (131_13N) repeated for different values for said original industry quantity M. A method according to any one of claims 1-14, wherein said analysis of said function, the said get at least one injection means (131_13N) in a workshop test. A method according to any one of claims 1 to 15, wherein said internal combustion engine (101) is included in a vehicle (100) and wherein said analysis of said function causes said at least one injection means (131_13N) to be performed when said vehicle (100) is stationary and said internal combustion engine (101) is disengaged from a driveline in said vehicle (100). A computer program comprising program code, which, when said program code is executed in a computer, causes said computer to perform the method according to any of claims 1-16. A computer program product comprising a computer readable medium and a computer program according to claim 17, wherein said computer program is included in said computer readable medium. A system arranged for analysis of a function of at least one injection means (131_13N) in a combustion engine (101), said combustion engine (101) comprising a number of cylinders (1_N) which are milled with fuel by injection by means of a number of injection means (131_13N); comprising: - a first determining unit (141), arranged for determining a deceleration time T1 related to a special injection means (131), wherein said deceleration time T1 corresponds to the time it takes for said combustion engine (101) to decrease the speed of the combustion engine and from a speed of one col to a second lower speed co2 by interrupting said fuel injection for all further injection means (132_13N), said additional injection means (132_13N) including said number of injection means except said special injection means (131); - a second determining unit (142), arranged for determining at least one further deceleration time T2_TN, by repeating said determining the said deceleration time with each of said further 27 537 277 injection means (132_13N) as said separate injection means; can be drawn by - an adjustment unit (144), arranged to perform an adjustment of an initial amount of M —predet fuel am At least one deceleration time of the fixed deceleration times' 1-TN, Iran deviates a deceleration time interval Tpredet 1 — Tpredet N is related to said original quantity M —predet fuel which is supplied to each cylinder of said respective injection means (131_13N), said adjusting unit (144) being arranged to perform said adjustment for each injection means having a different turning time, ddr ndmnda adjustment of ndmnda original amount M —predet fuel is performed in accordance with an iterative algorithm until an adjusted deviating deceleration time Tadjust _... Tadjust N for the injection means nAr ndmnda deceleration time interval Tpredet 1 ••• Tpredet; Tadjust 1 ••• Tadjust N — Tpredet 1.-Tpredet N; and - a third fixing unit (143), arranged for fixing an adjusted quantity Madjust

1. ..Macimst N fuel, which is related to ndmnda adjusted downturn time Tad jusL 1 ••• TadjusL N • 28 537 277 1/4 Normal • 071440 Crank angle