SE1450969A1 - Method for detecting fuel filter mounting errors - Google Patents

Method for detecting fuel filter mounting errors Download PDF

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Publication number
SE1450969A1
SE1450969A1 SE1450969A SE1450969A SE1450969A1 SE 1450969 A1 SE1450969 A1 SE 1450969A1 SE 1450969 A SE1450969 A SE 1450969A SE 1450969 A SE1450969 A SE 1450969A SE 1450969 A1 SE1450969 A1 SE 1450969A1
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SE
Sweden
Prior art keywords
fuel
filter
fuel tank
tank
pressure drop
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Application number
SE1450969A
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Swedish (sv)
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SE538255C2 (en
Inventor
Anders Jonsson
Original Assignee
Scania Cv Ab
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Publication date
Application filed by Scania Cv Ab filed Critical Scania Cv Ab
Priority to SE1450969A priority Critical patent/SE538255C2/en
Priority to DE112015003246.0T priority patent/DE112015003246T5/en
Priority to PCT/SE2015/050883 priority patent/WO2016028211A1/en
Publication of SE1450969A1 publication Critical patent/SE1450969A1/en
Publication of SE538255C2 publication Critical patent/SE538255C2/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D27/00—Cartridge filters of the throw-away type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F02M37/42—Installation or removal of filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/03118—Multiple tanks, i.e. two or more separate tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/03118—Multiple tanks, i.e. two or more separate tanks
    • B60K2015/03138—Pumping means between the compartments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/03236—Fuel tanks characterised by special filters, the mounting thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/10—Road Vehicles
    • B60Y2200/14—Trucks; Load vehicles, Busses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/224—Diagnosis of the fuel system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/3005—Details not otherwise provided for

Abstract

S ammandrag Uppfinningen avser ett forfarande for detektering av fel avseende montering av ett branslefilter i ett branslesystem (4) for en forbranningsmotor (2), vilket branslesystem (4) innefattar en forsta bransletank (20), en andra bransletank (22), en forsta bransle- ledning (26) anordnad i forbindelse med den forsta bransletanken (20) och den andra bransletanken (22), en forsta branslepump (24) anordnad att mata bransle fran den andra bransletanken (22) till den forsta bransletanken (20) genom den forsta bransleledningen (26), en andra branslepump (28) anordnad att mata bransle fran den forsta bransletanken (20) till en hogtryckskrets (18) hos branslesystemet (4) samt ett forsta branslefilter (30) anordnat nedstroms den forsta branslepumpen (24) och uppstroms den andra branslepumpen (28). Forfarandet innefattar stegen att: definiera ett toleransomrade for tryckfall over det forsta branslefiltret (30); styra den forsta branslepumpen (24) att mata bransle fran den andra bransletanken (22) till den forsta bransletanken (20) genom det forsta branslefiltret (30); c) berakna ett tryckfall over det forsta branslefiltret (30); och d) bestamma om fel har uppstatt vid monteringen av det forsta branslefiltret (30), genom att kontrollera om det beraknade tryckfallet är inom det definierade toleransomradet. Uppfinningen avser aven ett branslesystem (4), en forbranningsmotor (2) innefattande namnda branslesystem (4) samt ett fordon (1) innefattande namnda branslesystem (4). (Fig. 2) SUMMARY The invention relates to a method for detecting faults regarding the installation of a fuel filter in a fuel system (4) for an internal combustion engine (2), which fuel system (4) comprises a first fuel tank (20), a second fuel tank (22), a first fuel line (26) arranged in connection with the first fuel tank (20) and the second fuel tank (22), a first fuel pump (24) arranged to supply fuel from the second fuel tank (22) to the first fuel tank (20) through the the first fuel line (26), a second fuel pump (28) arranged to supply fuel from the first fuel tank (20) to a high pressure circuit (18) of the fuel system (4) and a first fuel filter (30) arranged downstream of the first fuel pump (24) and upstream of the second fuel pump (28). The method comprises the steps of: defining a tolerance range for pressure drop across the first fuel filter (30); controlling the first fuel pump (24) to supply fuel from the second fuel tank (22) to the first fuel tank (20) through the first fuel filter (30); c) calculating a pressure drop across the first fuel filter (30); and d) determining if an error has occurred during the installation of the first fuel filter (30), by checking whether the calculated pressure drop is within the defined tolerance range. The invention also relates to a fuel system (4), an internal combustion engine (2) comprising said fuel system (4) and a vehicle (1) comprising said fuel system (4). (Fig. 2)

Description

Sokande: Scania CV AB Forfarande for detektering av fel avseende montering av branslefilter. Applicant: Scania CV AB Procedure for detecting faults regarding installation of industry filters.

UPPFINNINGENS BAKGRUND OCH KAND TEKNIK Foreliggande uppfinning avser ett forfarande for detektering av fel avseende montering av ett brdnslefilter i ett brdnslesystem for en forbranningsmotor enligt patentkravet 1. Uppfinningen avser ocksa ett brdnslesystem enligt patentkravet 10, en forbrannings- 1 0motor med ett sadant brdnslesystem enligt patentkravet 13 samt ett fordon med ett sa- dant brdnslesystem enligt patentkravet 14. BACKGROUND OF THE INVENTION AND PRIOR ART The present invention relates to a method for detecting faults regarding the installation of a fuel filter in a fuel system for an internal combustion engine according to claim 1. The invention also relates to a fuel system according to claim 10, an internal combustion engine 13 with a fuel system according to such a patent. and a vehicle with such a fuel system according to claim 14.

En forbranningsmotor, sasom en kolvmotor, vilken drivs av diesel eller bensin är forsedd med ett brdnslesy stem for att transportera brdnslet fran en eller flera brdnsletankar till forbranningsmotorns insprutningssystem. Brdnslesystemet kan innefatta en 15.gtryckskrets och en hogtryckskrets ddr lagtryckskretsen innefattar en eller flera branslepumpar/matarpumpar, som kan drivas mekaniskt av forbranningsmotorn eller drivas av en elmotor. Brdnslepumparna skapar ett brdnsleflode och tryck for att transportera brdnslet till hogtryckskretsen och en ackumulator som kan vara i form av en sa kallad common rail och vidare till forbranningsmotorns insprutningssystem, vilket tiff& brdnslet till forbranningsmotorns forbranningsrum. Common rail kan uteslutas och brdnslesystemet kan istallet innefatta en annan form av insprutningssystem, exempelvis piezo- eller enhetsinsprutningssystem. An internal combustion engine, such as a piston engine, which is powered by diesel or petrol, is provided with a fuel system for transporting the fuel from one or more fuel tanks to the injection engine of the internal combustion engine. The fuel system may comprise a pressure pressure circuit and a high pressure circuit where the low pressure circuit comprises one or more fuel pumps / feed pumps, which may be mechanically driven by the internal combustion engine or driven by an electric motor. The fuel pumps create a fuel flow and pressure to transport the fuel to the high pressure circuit and an accumulator which can be in the form of a so-called common rail and further to the internal combustion engine injection system, which tiff & the fuel to the internal combustion engine combustion chamber. Common rail can be excluded and the fuel system may instead comprise another form of injection system, for example piezo or unit injection system.

Brdnslesystem innefattar aven brdnslefilter for filtrering av brdnslet innan det nar for- branningsmotorns insprutningssystem. Forbranningsmotorn och dess insprutningssystem är kdnsliga for kontamineringar och kan paverkas negativt om brdnslet är allt for fororenat. Kontamineringar kan avse fasta partiklar, gas eller vatska. Aven om brdnslet endast innefattar en liten mangd kontamineringar kan konsekvensen bli att forbran- ningsmotorn inte kan drivas av brdnslet eller att insprutningssystemet skadas. Bransle- system innefattar darfor brdnslefilter, som bade bortfiltrerar partiklar samt separerar vatten, som forekommer i branslet. 2 Brdnslefilter kan pa grund av olika orsaker behova bytas ut och ndr det nya brdnslefiltret monteras är det viktigt att brdnslefiltret monteras pa ett korrekt sdtt och att det är eft for andamalet avsett branslefilter som monteras. For ett fordon finns specificerat vilken typ av brdnslefilter som bor anvandas och om en annan typ monteras kan det fa foljder som driftstorningar och haverier. Exempelvis, om ett branslefilter med samre filtre- ringsegenskaper monteras, okar risken for att kontamineringar nar och skadar forbranningsmotorns insprutningssystem. pa samma satt kan ett felmoterat brdnslefilter medfora att kontamineringar passerar igenom och damned nar och skadar forbranningsmotorns insprutningssystem, vilket kan orsaka driftstorningar och haverier. Det är dock svart att upptacka om ett brdnslefilter har monterats pa ett felaktigt sat eller om ett felaktigt brdnslefilter har monterats. Ofta upptacks inte sadana fel forran det är for sent och driftstomingen är ett faktum. Fuel systems also include fuel filters for filtering the fuel before it reaches the internal combustion engine injection system. The internal combustion engine and its injection system are susceptible to contamination and can be adversely affected if the fuel is too polluted. Contamination can refer to solid particles, gas or liquid. Even if the fuel contains only a small amount of contamination, the consequence may be that the internal combustion engine cannot be driven by the fuel or that the injection system is damaged. Fuel systems therefore include fuel filters, which both filter out particles and separate water, which occurs in the industry. 2 Fuel filters may need to be replaced for various reasons and when the new fuel filter is fitted, it is important that the fuel filter is fitted in the correct way and that it is fitted according to the intended fuel filter. For a vehicle, it is specified which type of fuel filter should be used and if another type is fitted, it can have consequences such as malfunctions and breakdowns. For example, if an industry filter with common filtration properties is fitted, the risk of contamination increases and damages the internal combustion engine's injection system. In the same way, a faulty fuel filter can cause contamination to pass through and dam down and damage the internal combustion engine's injection system, which can cause malfunctions and breakdowns. However, it is black to detect if a fuel filter has been fitted incorrectly or if a faulty fuel filter has been fitted. Often such errors are not detected until it is too late and the operating emptying is a fact.

I dokumentet US7615151 visas ett system for att detektera om ett brdnslefilter är fel- 1 monterat eller saknas i ett brdnslesystem, varvid brdnslefiltret innefattar en anordning som bestammer om brdnslefiltret är monterat i en korrekt position eller i en felaktig position. I de fall brdnslefiltret är felmonterat, styrs en magnetstyrd ventil, sà att flOdet genom brdnslefiltret atminstone delvis blockeras. En sadan losning kraver speciellt utformade branslefilter med komplicerad konstruktion som ocksa gor brdnslesystemet oflexibelt cid endast en bestamd typ av filterelement gar att anvanda i brdnslefiltrets filterhus. Document US7615151 discloses a system for detecting whether a fuel filter is incorrectly mounted or missing in a fuel system, the fuel filter comprising a device which determines whether the fuel filter is mounted in a correct position or in an incorrect position. In cases where the fuel filter is incorrectly mounted, a magnetically controlled valve is controlled so that the flow through the fuel filter is at least partially blocked. Such a solution requires specially designed fuel filters with complicated construction which also make the fuel system inflexible and only a certain type of filter element can be used in the filter housing of the fuel filter.

Dokument EP1143232 visar en anordning for att math. differentialtrycket Over ett brdnslefilter anordnat i forbindelse med forbranningsmotorn. Ndr differentialtrycket underskrider ett referensvarde utfor en utvarderingsenhet en atgard, exempelvis avges en signal. Ett differentialtryck som underskrider referenstrycket kan innebdra att branslefiltret är felmonterat eller saknas. Tryckgivare är anordnade fore och efter brdnslefiltret for att bestamma differentialtrycket. En sadan anordning erfordrar extra komponenter och är storningskdnslig. Om nagon utav tryckgivarna skulle ga sonder kan inte ldngre felaktigheter avseende montering av brdnslefilter identifieras. 3 Trots kdnda losningar pd omradet finns sdledes ett behov av att vidareutveckla ett forfarande for att detektera fel avseende montering av brdnslefilter i ett brdnslesystem, som är tillforlitligt och kostnadseffektivt. Document EP1143232 shows a device for math. differential pressure Over a fuel filter arranged in connection with the internal combustion engine. When the differential pressure falls below a reference value outside an evaluation unit an action, for example a signal is emitted. A differential pressure below the reference pressure can mean that the industry filter is incorrectly mounted or missing. Pressure sensors are arranged before and after the fuel filter to determine the differential pressure. Such a device requires additional components and is susceptible to malfunction. If any of the pressure sensors should go probes, no longer inaccuracies regarding the installation of fuel filters can be identified. Thus, despite known solutions in the field, there is a need to further develop a method for detecting faults regarding the installation of fuel filters in a fuel system which is reliable and cost-effective.

SAMMANFATTNING AV UPPFINNINGEN Syftet med foreliggande uppfinning är att astadkomma ett forfarande for att detektera fel avseende montering av branslefilter i ett brdnslesystem, som är tillforlitligt och kostnadseffektivt. SUMMARY OF THE INVENTION The object of the present invention is to provide a method for detecting faults in the installation of fuel filters in a fuel system which is reliable and cost-effective.

Annu ett syfte med uppfinningen är att astadkomma ett forfarande for att detektera fel avseende montering av brdnslefilter i ett brdnslesystem, som minimerar risken for driftstorningar. Another object of the invention is to provide a method for detecting faults regarding the installation of fuel filters in a fuel system which minimizes the risk of operational disturbances.

Ytterligare ett syfte med uppfinningen är att hstadkomma ett brdnslesystem for en for- brdnningsmotor ddr detektering av fel avseende montering av brdnslefilter kan ske pd ett tillforlitligt och kostandseffektivt sat. A further object of the invention is to provide a fuel system for an internal combustion engine where detection of errors regarding the installation of a fuel filter can take place in a reliable and cost-effective manner.

Dessa syften uppnas med ett forfarande for att detektera fel avseende montering av branslefilter i ett brdnslesystem av det inledningsvis ndmnda slaget, vilket Unneteck- nas av de sardrag som anges i patentkravets 1 kannetecknande del. These objects are achieved with a method for detecting faults with regard to the installation of fuel filters in a fuel system of the type mentioned in the introduction, which is characterized by the features stated in the characterizing part of claim 1.

Dessa syften uppnds aven med ett brdnslesystem enligt patentkravets 10 kannetecknande del, en forbrdnningsmotor med ett sadant brdnslesystem enligt patentkravets 13 kannetecknande del, ett fordon med ett shdant brdnslesystem enligt patentkravets 14 kdnnetecknande del, ett datorprogram enligt patentkravet 15 och en datorprogramprodukt enligt patentkravet 16. These objects are also achieved with a fuel system according to the marking part of claim 10, an internal combustion engine with such a fuel system according to the marking part of claim 13, a vehicle with such a fuel system according to claim 14, a computer program according to claim 15 and a computer program according to claim 15.

Enligt en aspekt av foreliggande uppfinning tillhandahdlls ett forfarande for detekte- ring av fel avseende montering av brdnslefilter i ett brdnslesystem for en forbran- ningsmotor, vilket brdnslesystem innefattar en forsta brdnsletank, en andra brdnsletank, en forsta brdnsleledning anordnad i forbindelse med den forsta brdnsletanken och den 4 andra bransletanken, en forsta branslepump anordnad att mata bransle frail den andra bransletanken till den forsta bransletanken genom den forsta bransleledningen, en andra branslepump anordnad att mata bransle fran den forsta bransletanken till en hogtryckskrets hos branslesystemet samt ett forsta branslefilter anordnat nedstroms den forsta branslepumpen och uppstroms den andra branslepumpen. Forfarandet inne- fattar lampligen stegen att definiera ett toleransomrade for tryckfall over det forsta branslefiltret; styra den forsta branslepumpen att mata bransle fran den andra bransletanken till den forsta bransletanken genom det forsta branslefiltret; berakna ett tryckfall over det forsta branslefiltret och bestamma om fel har uppstatt vid monteringen av det 1 0forsta branslefiltret, genom att kontrollera om det beraknade tryckfallet for det forsta branslefiltret är inom det definierade toleransomradet. pa sa salt astadkommes ett forfarande for att detektera fel avseende montering av branslefilter i ett branslesystem, som är flexibelt, tillforlitligt och kostnadseffektivt. According to one aspect of the present invention, there is provided a method of detecting fuel filter failure faults in an internal combustion engine fuel system, the fuel system comprising a first fuel tank, a second fuel tank, a first fuel line arranged in conjunction with the first fuel tank. the 4 second fuel tank, a first fuel pump arranged to feed fuel frail the second fuel tank to the first fuel tank through the first fuel line, a second fuel pump arranged to feed fuel from the first fuel tank to a high pressure circuit of the fuel system and a first fuel filter arranged downstream of the first and upstream of the second fuel pump. The method suitably comprises the steps of defining a tolerance range for pressure drop across the first fuel filter; controlling the first fuel pump to feed fuel from the second fuel tank to the first fuel tank through the first fuel filter; calculate a pressure drop across the first fuel filter and determine if an error has occurred during the installation of the first fuel filter, by checking whether the calculated pressure drop for the first fuel filter is within the defined tolerance range. In this way, a procedure is provided for detecting faults regarding the installation of fuel filters in a fuel system, which is flexible, reliable and cost-effective.

Det definierade toleransomradet for tryckfall over det forsta branslefiltret baseras fore- tradesvis pa ett for andamalet avsett referensbranslefilter. Referensbranslefiltret är ett branslefilter som är avsett att anvandas i branslesystemet och darmed uppfyller onskade krav pa filtreringsegenskaper och kvalitet. Saledes är det definierade toleransomradet for tryckfall over det forsta bran slefiltret, det omrade inom vilket tryckfallet borde ligga om ett for andamalet avsett branslefilter har monterats pa raft salt. Det viii saga, det definierade toleransomradet for tryckfall over det forsta branslefiltret är det omrade inom vilket tryckfallet borde ligga om det forsta branslefiltret är ett branslefilter motsvarande referensbranslefiltret och har monterats pa rat sat. Det definierade toleransomradet kan aven baseras pa den for andamalet avsedda bransletypen. Typen av brans- le som anvands i ett branslesystem pa.verkar tryckfallet over ett visst branslefilter. For ett visst branslefilter erhalles exempelvis ett hogre tryckfall nar ett bransle med hogre viskositet anvands an nar ett bransle med lagre viskositet anvands. Exempelvis har biodiesel en hogre viskositet an diesel och saledes skulle tryckfallet Over referensbranslefiltret vid anvandning av biodiesel skilja sig fran tryckfallet vid anvandning av diesel. Saledes kan toleransomradet definieras med hansyn tagen till vilken typ av bransle som anvands i branslesystemet. Toleransomradet kan definieras genom manu- ell inmatning i en hos branslesystemet anordnad styrenhet. Alternativt definieras toleransomradet automatiskt hos styrenheten. The defined tolerance range for pressure drop across the first fuel filter is preferably based on a reference fuel filter intended for the purpose. The reference industry filter is an industry filter that is intended to be used in the industry system and thus meets the desired requirements for filtration properties and quality. Thus, the defined tolerance range for pressure drop across the first fuel filter is the range within which the pressure drop should be if a dedicated fuel filter has been mounted on the salt. That is to say, the defined tolerance range for pressure drop across the first industry filter is the range within which the pressure drop should be if the first industry filter is an industry filter corresponding to the reference industry filter and has been mounted on the set. The defined tolerance range can also be based on the industry type intended for the purpose. The type of industry used in an industry system affects the pressure drop across a certain industry filter. For a certain industry filter, for example, a higher pressure drop is obtained when an industry with a higher viscosity is used than when an industry with a lower viscosity is used. For example, biodiesel has a higher viscosity than diesel and thus the pressure drop across the reference fuel filter when using biodiesel would differ from the pressure drop when using diesel. Thus, the range of tolerance can be defined with regard to the type of industry used in the industry system. The tolerance range can be defined by manual entry in a control unit arranged with the fuel system. Alternatively, the tolerance range is automatically defined by the control unit.

Fel anses lampligen ha uppstatt vid monteringen av det forsta branslefiltret i det fallet att det beraknade tryckfallet for det forsta branslefiltret ligger utanfor toleransomradet. Faults are considered to have arisen during the installation of the first fuel filter in the event that the calculated pressure drop for the first fuel filter is outside the tolerance range.

Toleransomradet definieras lampligen som ett omrade mellan ett maxvarde och minimivarde och att det beraknade tryckfallet ligger utanfor toleransomradet innebar sale-des att det beraknade tryckfallet antingen overstiger maxvardet eller underskfider minimiv ardet. The tolerance range is aptly defined as an area between a maximum value and a minimum value, and the fact that the calculated pressure drop is outside the tolerance range meant that the calculated pressure drop either exceeds the maximum value or falls below the minimum value.

Foretradesvis indikerar ett detekterat fel att det forsta branslefiltret är felmonterat eller att fel branslefilter har monterats. Med fel branslefilter avses ett branslefilter, som inte motsvarar referensbranslefiltret. Ett beraknat tryckfall underskridande minimivardet hos toleransomradet kan indikera att fel typ av branslefilter är monterat eller att brans- lefiltret är felmonterat. Ett beraknat tryckfall overstigande maxvardet hos toleransom- I-Met kan indikera att branslefiltret är felmoterat eller att ett bransle med hogre viskositet an ett for referensbranslefiltret avsett bransle anvands. Preferably, a detected fault indicates that the first fuel filter is incorrectly mounted or that the wrong fuel filter has been installed. An incorrect industry filter refers to an industry filter that does not correspond to the reference industry filter. An estimated pressure drop below the minimum value of the tolerance range may indicate that the wrong type of fuel filter is fitted or that the fuel filter is incorrectly fitted. An estimated pressure drop exceeding the maximum value of the tolerance I-Met may indicate that the fuel filter is incorrectly mounted or that a fuel with a higher viscosity than a fuel intended for the reference fuel filter is used.

Genom att jamfora det beraknade tryckfallet med det definierade toleransomradet kan aven detekteras om branslefilter helt saknas. Ett beraknat tryckfall underskridande mi- nimivardet hos toleransomradet kan saledes indikera att inget branslefilter har monterats mellan den forsta och den andra branslepumpen. By comparing the calculated pressure drop with the defined tolerance range, it can also be detected if an industry filter is completely missing. An estimated pressure drop below the minimum value of the tolerance range can thus indicate that no fuel filter has been fitted between the first and the second fuel pump.

Det forsta branslefiltret kan innefatta ett filterhus samt ett filterelement monterat i flu- terhuset. I det fallet att det beraknade tryckfallet ligger utanfor det definierade tole- ransomradet, kan saledes filterelementet vara felmonterat, ett felaktigt filterelement kan ha monterats eller sa har inget filterelement ails monterats i filterhuset. The first fuel filter may comprise a filter housing and a filter element mounted in the flute housing. In the event that the calculated pressure drop is outside the defined tolerance range, the filter element may thus be incorrectly mounted, an incorrect filter element may have been mounted or no filter element may have been mounted in the filter housing.

Foretradesvis utfors forfarandet enligt foreliggande uppfinning i samband med bransle- filterbyte eller montering av det forsta branslefiltret. Genom att direkt vid monteringen av det forsta branslefiltret aktivt styra den forsta branslepumpen att mata bransle genom det forsta branslefiltret, berakna tryckfallet Over det forsta branslefiltret samt kon- 6 trollera om det ligger Mom ett definierat toleransomrade Mom vilket tryckfallet borde ligga, astadkommes ett effektivt salt att detektera fel vid ett tidigt skede. pa sa satt säkerstalls att ett felmonterat branslefilter eller ett monterat felaktigt branslefilter detekteras i ett tidigt stadie och darmed kan felet snabbt atgardas. Vid monteringen uppvisar dessutom branslefiltret en minimal igensattningsgrad, varvid en tillforlitlig berakning av tryckfallet kan astadkommas. Darmed minimeras risken for att ett felmonterat branslefilter eller ett monterat felaktigt branslefilter orsakar att kontamineringar fors vidare till forbranningsmotorns insprutningssystem och orsakar driftstorningar. Genom att detektera fel avseende monteringen av det forsta branslefiltret i branslesystemet minimeras aven risken for att den andra branslepumpen, nedstroms branslefiltret, ska- das pa grund av kontamineringar. Det forsta branslefiltret utgor saledes ett sa kallat forfilter. Preferably, the method of the present invention is performed in connection with industry filter replacement or installation of the first industry filter. By directly controlling the first fuel pump to feed fuel through the first fuel filter directly during the installation of the first fuel filter, calculate the pressure drop across the first fuel filter and check if there is a defined tolerance range Mom which the pressure drop should be, an effective salt is achieved to detect faults at an early stage. in this way it is ensured that an incorrectly fitted industry filter or an incorrectly fitted industry filter is detected at an early stage and thus the error can be rectified quickly. During assembly, the fuel filter also has a minimal degree of clogging, whereby a reliable calculation of the pressure drop can be achieved. This minimizes the risk that an incorrectly mounted fuel filter or a faulty fuel filter is fitted, causing contamination to be passed on to the internal combustion engine's injection system and causing malfunctions. By detecting faults regarding the installation of the first fuel filter in the fuel system, the risk of the second fuel pump, downstream of the fuel filter, being damaged due to contamination is also minimized. The first industry filter thus constitutes a so-called pre-filter.

Den forsta branslepumpen drivs lampligen av en forsta elektrisk motor och den andra branslepumpen drivs lampligen av en andra elektrisk motor. Med en elektriskt driven branslepump medges ett bredare styrintervall an med en mekanisk pump, vilken vanligtvis drivs och styrs av en forbranningsmotor och framforallt av forbranningsmotoms varvtal. En elektriskt driven branslepump kan styras mot andra parametrar an motorvarvtal , till ex empel bran sl efilteri gen sattning sgrad och tryck i bran sl el edningarn a. The first fuel pump is suitably driven by a first electric motor and the second fuel pump is suitably driven by a second electric motor. With an electrically driven fuel pump, a wider control range is allowed with a mechanical pump, which is usually driven and controlled by an internal combustion engine and above all by the speed of the internal combustion engine. An electrically driven fuel pump can be controlled against other parameters than engine speed, for example fuel filter setting and pressure in the fuel lines.

Enligt en aspekt av foreliggande uppfinning beraknas tryckfallet over det forsta branslefiltret baserat pa ett flode genom det forsta branslefiltret. Flodet genom det forsta branslefiltret bestams foretradesvis genom att mata nivaforandringen hos branslet i den forsta bransletanken under en pa forhand bestamd tid, vilken nivaforandring bestams medelst en nivagivare anordnad i den forsta bransletanken. Genom att avlasa nivagiva- rens signaler och pa sa sat bestamma hur branslevolymen i den forsta bransletanken har forandrats under en viss tid kan flodet genom det forsta branslefiltret bestammas. Alternativt kan flodet bestammas genom att mata hur lang tid det tar att medelst den forsta branslepumpen fylla den forsta bransletanken. According to one aspect of the present invention, the pressure drop across the first fuel filter is calculated based on a flow through the first fuel filter. The flow through the first fuel filter is preferably determined by feeding the level change of the fuel in the first fuel tank for a predetermined time, which level change is determined by means of a level sensor arranged in the first fuel tank. By reading the level sensor's signals and thus determining how the industry volume in the first industry tank has changed over a certain period of time, the flow through the first industry filter can be determined. Alternatively, the flood can be determined by feeding how long it takes to fill the first fuel tank by means of the first fuel pump.

Enligt en aspekt av foreliggande uppfinning beraknas tryckfallet over det forsta brans- lefiltret baserat pa den forsta branslepumpens varvtal och/eller stromforbrukning. Be- 7 roende pa den forsta branslepumpens karakteristika motsvarar ett vary en viss mangd bransle som matas medelst branslepumpen och den forsta branslepumpens varvtal (vary per tidsenhet) motsvarar saledes ett visst bransleflode. Den forsta branslepumpens varvtal kan bestammas genom att mata den forsta elektriska motorns (och darmed den forsta branslepumpens) spanning eller stromforbrukning. Genom att mata den for- sta branslepumpens varvtal och/eller stromforbrukning kan flodet som den forsta branslepumpen genererar bestammas. Samtidigt erhalles en kontroll av att den forsta branslepumpen fungerar som onskat. Genom att jamfora det faktiska bestamda flodet genom det forsta branslefiltret med flodet som den forsta branslepumpen genererar, kan tryckfallet over det forsta branslefiltret beraknas. According to one aspect of the present invention, the pressure drop across the first fuel filter is calculated based on the speed and / or power consumption of the first fuel pump. Depending on the characteristics of the first fuel pump, a vary corresponds to a certain amount of fuel fed by the fuel pump and the speed of the first fuel pump (vary per unit of time) thus corresponds to a certain fuel flow. The speed of the first fuel pump can be determined by feeding the voltage or current consumption of the first electric motor (and thus the first fuel pump). By feeding the speed and / or power consumption of the first fuel pump, the flow generated by the first fuel pump can be determined. At the same time, a check is obtained that the first fuel pump works as desired. By comparing the actual determined flow through the first fuel filter with the flow generated by the first fuel pump, the pressure drop across the first fuel filter can be calculated.

Enligt en aspekt av foreliggande uppfinning beraknas tryckfallet over det forsta branslefiltret baserat pa temperaturen hos branslet i den forsta bransletanken. Genom att avlasa temperaturen hos branslet i den forsta bransletanken, medelst en temperaturgi- vare, kan branslets viskositet bestammas. Viskositeten hos branslet kan paverka tryck- fallet over det forsta branslefiltret och genom att ta hansyn till viskositeten kan tryckfallet beraknas pt ett noggrant och tillforlitligt sat. According to one aspect of the present invention, the pressure drop across the first fuel filter is calculated based on the temperature of the fuel in the first fuel tank. By reading the temperature of the industry in the first industry tank, by means of a temperature sensor, the viscosity of the industry can be determined. The viscosity of the industry can affect the pressure drop across the first industry filter and by taking into account the viscosity, the pressure drop can be calculated in an accurate and reliable manner.

Enligt en aspekt av foreliggande uppfinning innefattar steget att kontrollera om det beraknade tryckfallet for det forsta branslefiltret är inom det definierade toleransomr5.- det, att generera ett felmeddelande nar fel har detekterats. Felmeddelandet kan lampligen presenteras i fordonet for foraren eller i ett diagnosverktyg vid en verkstad eller ett servicestalle. pa sa sat kan det detekterade felet synliggoras och atgardas. Felmeddelandet kan sparas i en hos fordonet anordnad styrenhet. According to one aspect of the present invention, the step includes checking whether the calculated pressure drop for the first fuel filter is within the defined tolerance range, generating an error message when an error has been detected. The error message can conveniently be presented in the driver's vehicle or in a diagnostic tool at a workshop or service center. in this way, the detected error can be made visible and hidden. The error message can be saved in a control unit arranged with the vehicle.

Enligt en aspekt av foreliggande uppfinning innefattar steget att kontrollera om det beraknade tryckfallet for det forsta branslefiltret är inom toleransomradet, att begransa bransletillforseln till forbranningsmotorn nar fel har detekterats. Bransletillforseln till forbranningsmotorn kan begransas genom att den forsta branslepumpen styrs, sa att bransleflodet till den forsta bransletanken begransas. Alternativt styrs den andra brans- lepumpen, sa att bransletillforseln till hogtryckskretsen begransas. Genom att begransa bransletillforseln till forbranningsmotorn begransas framforandet av fordonet s5. lange 8 som felet kvarstar. Nar felet har atgardats upphor lampligen begransningen av bransletillforseln. pa sa salt forhindras att det detekterade felet avseende montering av branslefilter missas eller ignoreras. Darmed sakerstalls exempelvis att inte ett branslefilter med samre filtreringsegenskaper an ett for andamalet avsett referensbranslefilter an- vands. Darmed astadkommes ett forfarande for att detektera fel avseende montering av branslefilter i ett branslesystem, som minimerar risken for driftstorningar. Alternativt forhindras start av forbranningsmotorn nar det beraknade tryckfallet ligger utanfor toleransomradet och fel avseende monteringen darmed har detekterats. According to one aspect of the present invention, the step of checking whether the calculated pressure drop for the first fuel filter is within the tolerance range includes limiting the fuel supply to the internal combustion engine when faults have been detected. The fuel supply to the internal combustion engine can be limited by controlling the first fuel pump, so that the fuel flow to the first fuel tank is limited. Alternatively, the second fuel pump is controlled, so that the fuel supply to the high-pressure circuit is limited. By limiting the fuel supply to the internal combustion engine, the performance of the vehicle s5 is limited. long 8 as the error persists. Once the fault has been rectified, the limitation of the industry supply will probably cease. in this way the detected error regarding the installation of the fuel filter is prevented from being missed or ignored. This ensures, for example, that an industry filter with the same filtration properties as a reference industry filter intended for the purpose is not used. This provides a method for detecting faults regarding the installation of fuel filters in a fuel system, which minimizes the risk of operational disturbances. Alternatively, starting the internal combustion engine is prevented when the calculated pressure drop is outside the tolerance range and mounting errors have thus been detected.

Enligt en aspekt av foreliggande uppfinning tillhandahalls ett branslesystem for en forbranningsmotor, innefattande en forsta bransletank, en andra bransletank, en forsta bransleledning anordnad i forbindelse med den forsta bransletanken och den andra bransletanken, en forsta branslepump anordnad att mata bransle fran den andra bransletanken till den forsta bransletanken genom den forsta bransleledningen, en andra branslepump anordnad att mata bransle fran den forsta bransletanken till en hogtrycks- krets samt ett forsta branslefilter anordnat nedstroms den forsta branslepumpen och uppstroms den andra branslepumpen. Branslesystemet innefattar vidare en styrenhet, som är anordnad att tillhandahalla ett definierat toleransomrade for ett tryckfall over ett for andam Met avsett referensbranslefilter, styra den forsta branslepumpen att mata bransle flan den andra bransletanken till den forsta bransletanken genom det forsta branslefiltret, berakna ett tryckfall over det forsta branslefiltret och bestamma om fel har uppstatt vid monteringen av det forsta branslefiltret genom att kontrollera om det beraknade tryckfallet är inom det definierade toleransomradet. According to one aspect of the present invention, there is provided a fuel system for an internal combustion engine, comprising a first fuel tank, a second fuel tank, a first fuel line arranged in connection with the first fuel tank and the second fuel tank, a first fuel pump arranged to supply fuel from the second fuel tank to the the first fuel tank through the first fuel line, a second fuel pump arranged to supply fuel from the first fuel tank to a high pressure circuit and a first fuel filter arranged downstream of the first fuel pump and upstream of the second fuel pump. The fuel system further comprises a control unit, which is arranged to provide a defined tolerance range for a pressure drop across a reference fuel filter intended for control, controlling the first fuel pump to supply fuel from the second fuel tank to the first fuel tank through the first fuel filter, calculating a pressure drop across it the first fuel filter and determine if an error has occurred during the installation of the first fuel filter by checking whether the calculated pressure drop is within the defined tolerance range.

Det definierade toleransomradet kan inmatas manuellt hos styrenheten, altemativt au- tomatiskt definieras hos styrenheten. Toleransomradet kan exempelvis lagras i styrenheten vid tillverkning av fordonet och uppdateras vid uppdatering av fordonets mjukvara, exempelvis vid service. The defined tolerance range can be entered manually at the control unit, alternatively automatically defined at the control unit. The tolerance range can, for example, be stored in the control unit during the manufacture of the vehicle and updated when updating the vehicle's software, for example during service.

Styrenheten är foretradesvis anordnad att berakna tryckfallet over det forsta branslefilt- ret baserat pa ett flode genom det forsta branslefiltret. 9 En nivagivare är foretradesvis anordnad i den forsta bransletanken. Styrenheten är lampligen anordnad i forbindelse med nivagivaren och den forsta branslepumpen. Lampligen är styrenheten anordnad i forbindelse med den forsta elektriska motorn, som driver den forsta branslepumpen. Vidare är styrenheten anordnad i forbindelse med den andra elektriska motorn, som driver den andra branslepumpen. pa sà sat kan styrenheten erhalla information om respektive branslepump. Styrenheten kan utgoras av en logik hos en forbranningsmotorstyrenhet, altemativt kan styrenheten utgora en separat styrenhet, som star i forbindelse med forbranningsmotorstyrenheten. The control unit is preferably arranged to calculate the pressure drop across the first industry filter based on a flow through the first industry filter. A level sensor is preferably arranged in the first fuel tank. The control unit is suitably arranged in connection with the level sensor and the first fuel pump. The control unit is arranged in connection with the first electric motor, which drives the first fuel pump. Furthermore, the control unit is arranged in connection with the second electric motor, which drives the second fuel pump. in this way, the control unit can obtain information about the respective fuel pump. The control unit can be constituted by a logic of an internal combustion engine control unit, alternatively the control unit can constitute a separate control unit, which is connected to the internal combustion engine control unit.

Styrenheten är lampligen anordnad att berakna tryckfallet over det forsta branslefiltret baserat pa den forsta branslepumpens varvtal och/eller stromforbrukning. Styrenheten är vidare lampligen anordnad att berakna tryckfallet Over det forsta branslefiltret base-rat pa temperaturen hos branslet i den forsta bransletanken. Styrenheten erhaller sale-des signaler fran nivagivaren, fran den forsta och den andra branslepumpen samt fran en temperaturgivare i den forsta bransletanken. Styrenheten kan aven erhalla signaler fran en eller flera andra styrenheter hos fordonet, exempelvis forbranningsmotorstyrenheten. The control unit is suitably arranged to calculate the pressure drop across the first fuel filter based on the speed and / or power consumption of the first fuel pump. The control unit is further suitably arranged to calculate the pressure drop across the first fuel filter based on the temperature of the fuel in the first fuel tank. The control unit receives signals from the level sensor, from the first and the second fuel pump and from a temperature sensor in the first fuel tank. The control unit can also receive signals from one or more other control units of the vehicle, for example the internal combustion engine control unit.

Lampligen är den forsta bransletanken sa utformad att den rymmer en mindre volym an den andra bransletanken. Denna utformning medger en mindre skrymmande forsta bransletank, som är lattare att anordna hos ett chassi. pa sa salt astadkommes ett ickeskrymmande branslesystem. Foretradelsevis rymmer den forsta bransletanken 20-50 liter och den andra bransletanken 300-1000 liter. En tredje bransletank kan vara anordnad i anslutning till den andra bransletanken. The first fuel tank is designed so that it holds a smaller volume than the second fuel tank. This design allows for a less bulky first fuel tank, which is easier to arrange in a chassis. on that salt a non-bulky industry system is achieved. Preferably, the first fuel tank holds 20-50 liters and the second fuel tank 300-1000 liters. A third fuel tank may be arranged adjacent to the second fuel tank.

Lampligen är den andra branslepumpen anordnad hos den forsta bransletanken. Pa sa salt skyddas den andra branslepumpen fran omgivningen och far en naturlig kylning av branslet i den forsta bransletanken. Alternativt är aven den forsta branslepumpen och det forsta branslefiltret anordnade inuti den forsta bransletanken. The second fuel pump is conveniently arranged at the first fuel tank. This salt protects the second fuel pump from the environment and causes a natural cooling of the fuel in the first fuel tank. Alternatively, the first fuel pump and the first fuel filter are also arranged inside the first fuel tank.

Enligt en aspekt av foreliggande uppfinning tillhandahalls ett datorprogram for att detektera fel avseende monteringen av ett branslefilter, dar nananda datorprogram inne- fattar programkod for att orsaka styrenheten eller en annan dator ansluten till styrenheten att utfora forfarandestegen enligt foreliggande uppfinning. According to one aspect of the present invention, there is provided a computer program for detecting errors in the mounting of an industry filter, wherein said computer program includes program code for causing the controller or another computer connected to the controller to perform the method steps of the present invention.

Vidare tillhandahalls en datorprogramprodukt innefattande en programkod lagrad pa ett, av en dator lasbart, medium for att utfora forfarandestegen enligt foreliggande upp- finning, nar nananda programkod kors pa styrenheten eller en annan dator ansluten till styrenheten. Namnda programkod kan vara icke flyktigt lagrad pa namnda av en dator lasbara medium. Furthermore, a computer program product is provided comprising a program code stored on a computer readable medium for performing the method steps of the present invention when any other program code is crossed on the control unit or another computer connected to the control unit. Said program code may be non-volatile stored on said computer readable medium.

Ytterligare fordelar med uppfinningen framgar av foljande detaljerade beskrivning. Further advantages of the invention will become apparent from the following detailed description.

KORT BESKRIVNING AV RITNINGARNA I det foljande beskrivs, sasom exempel, foredragna utforingsformer av uppfinningen med hanvisning till bifogade ritningar, pa vilka: Fig. 1visar en schematisk sidovy av ett fordon, som innefattar ett branslesystem enligt foreliggande uppfinning, Fig. 2visar ett kopplingsschema for ett branslesystem enligt foreliggande upp- finning, och Fig. 3visar ett flodesschema over forfarandet for att detektera fel avseende montering av branslefilter i ett branslesystem enligt foreliggande uppfin- ning. BRIEF DESCRIPTION OF THE DRAWINGS In the following, by way of example, preferred embodiments of the invention are described with reference to the accompanying drawings, in which: Fig. 1 shows a schematic side view of a vehicle comprising a branch system according to the present invention; Fig. 2 shows a circuit diagram of a fuel system according to the present invention, and Fig. 3 shows a flow chart of the procedure for detecting faults regarding the installation of fuel filters in a fuel system according to the present invention.

DETALJERAD BESKRIVNING AV EN UTFORINGSFORM AV UPPFINNINGEN Fig. 1 visar en schematisk sidovy av ett fordon 1, vilket fordon innefattar ett branslesy- stem 4 for en forbranningsmotor 2 enligt foreliggande uppfinning. Forbranningsmotorn 2 at- kopplad till en vaxellada 6, som kopplad till fordonets 1 drivhjul 8 via en transmission. Fordonet innefattar aven ett chassi 10. 11 Fig. 2 visar ett kopplingsschema for ett branslesystem 4 for en forbranningsmotor 2 enligt foreliggande uppfinning. Branslesystemet 4 innefattar en hogtryckspump 12, en ackumulator i form av en sa kallad common rail 14 samt ett insprutningssystem sche- matiskt visat i form av en bransleinsprutare 16, vilka är anordnade hos forbrannings- motorn 2 (forbranningsmotorn 2 visas i fig. 1) och utgor branslesystemets 4 hogtryckskrets 18. Alternativt kan common rail ersattas av en annan form av insprutningssystem, exempelvis piezo- eller enhetsinsprutningssystem. Branslesystemet 4 innefattar vidare en forsta bransletank 20, en andra bransletank 22, en forsta bransle- pump 24 anordnad att mata bransle fran den andra bransletanken 22 till den forsta bransletanken 20 genom en forsta bransleledning 26, en andra branslepump 28 anordnad att mata bransle fran den forsta bransletanken 20 till hogtryckskretsen 18 samt ett forsta branslefilter 30 anordnat nedstroms den forsta branslepumpen 24 och uppstroms den andra branslepumpen 28. Dessa komponenter kan vara anordnade vid fordonets chassi 10 (chassi 10 visas i fig. 1). Ett andra branslefilter 32 är anordnat nedstroms den andra branslepumpen 28 och uppstroms hogtryckspumpen 12 i branslesystemet 4. Det forsta branslefiltret 30 utgor lampligen ett forfilter och det andra branslefiltret 32 utgor lampligen ett huvudbranslefilter. Vidare innefattar branslesystemet 4 en branslereturledning 34, genom vilken bran sle retumeras fran bran slesystemets 4 hogtryckskrets 18 tillbaka till den forsta bransletanken 20. DETAILED DESCRIPTION OF AN EMBODIMENT OF THE INVENTION Fig. 1 shows a schematic side view of a vehicle 1, which vehicle comprises a fuel system 4 for an internal combustion engine 2 according to the present invention. The internal combustion engine 2 is connected to a gearbox 6, as connected to the drive wheel 8 of the vehicle 1 via a transmission. The vehicle also comprises a chassis 10. Fig. 2 shows a wiring diagram for a fuel system 4 for an internal combustion engine 2 according to the present invention. The fuel system 4 comprises a high-pressure pump 12, an accumulator in the form of a so-called common rail 14 and an injection system schematically shown in the form of a fuel injector 16, which are arranged at the internal combustion engine 2 (the internal combustion engine 2 is shown in Fig. 1) and constitutes the high pressure circuit 18 of the fuel system 4. Alternatively, the common rail can be replaced by another form of injection system, for example piezo or unit injection system. The fuel system 4 further comprises a first fuel tank 20, a second fuel tank 22, a first fuel pump 24 arranged to supply fuel from the second fuel tank 22 to the first fuel tank 20 through a first fuel line 26, a second fuel pump 28 arranged to feed fuel therefrom. the first fuel tank 20 to the high pressure circuit 18 and a first fuel filter 30 disposed downstream of the first fuel pump 24 and upstream of the second fuel pump 28. These components may be located at the vehicle chassis 10 (chassis 10 is shown in Fig. 1). A second fuel filter 32 is arranged downstream of the second fuel pump 28 and upstream of the high pressure pump 12 in the fuel system 4. The first fuel filter 30 is suitably a pre-filter and the second fuel filter 32 is a main fuel filter. Furthermore, the fuel system 4 comprises a fuel return line 34, through which fuel is returned from the high pressure circuit 18 of the fuel system 4 back to the first fuel tank 20.

De tva bransletankarna 20, 22 är i sina respektive ovre delar forbundna med en ventilationsledning 36 vilken kommunicerar med omgivningen. Ventilationsledningen 36 sakerstaller att trycket i respektive tank 20, 22 är och forblir vasentligen detsamma och lika med omgivningens luftryck oberoende av hur mycket bransle som finns i respekti- ve tank. The two fuel tanks 20, 22 are in their respective upper parts connected to a ventilation duct 36 which communicates with the surroundings. The ventilation line 36 states that the pressure in the respective tank 20, 22 is and remains essentially the same and equal to the ambient air pressure regardless of how much fuel is in the respective tank.

Den forsta bransletanken 20 är sa utformad att den rymmer en mindre volym an den andra bransletanken 22, vilken andra bransletank 22 motsvarar en huvudbransletank. The first fuel tank 20 is designed to hold a smaller volume than the second fuel tank 22, which second fuel tank 22 corresponds to a main fuel tank.

Den forsta branslepumpen 24 är enligt fig. 2 anordnad mellan den forsta bransletanken 20 och den andra bransletanken 22. Den forsta branslepumpen 24 drivs av en forsta elektrisk motor Ml. Den andra branslepumpen 28 drivs av en andra elektrisk motor 12 M2 och är anordnad inuti den forsta bransletanken 20 och skyddas pa sa satt frail omgivningen och kyls av branslet. Mellan den forsta bransletanken 20 och den andra bransletanken 22 är en overstromningsledning 38 anordnad, sà att bransle kan transporteras over fran den forsta bransletanken 20 till den andra bransletanken 22 om den forsta bransletanken 20 blir overfylld. Den andra branslepumpen 28 har som huvud- uppgift att mata branslet fran den forsta bransletanken 20 via en andra bransleledning 40 genom huvudbranslefiltret 32 och vidare till hogtryckskretsen 18. Med Mgt tryck matas sedan branslet till common rail 14 och vidare till forbranningsmotorns 2 insprutningssystem 16. According to Fig. 2, the first fuel pump 24 is arranged between the first fuel tank 20 and the second fuel tank 22. The first fuel pump 24 is driven by a first electric motor M1. The second fuel pump 28 is driven by a second electric motor 12 M2 and is arranged inside the first fuel tank 20 and is thus protected from the environment and cooled by the fuel. Between the first fuel tank 20 and the second fuel tank 22 an overflow line 38 is arranged, so that fuel can be transported over from the first fuel tank 20 to the second fuel tank 22 if the first fuel tank 20 becomes overfilled. The second fuel pump 28 has as its main task to feed the fuel from the first fuel tank 20 via a second fuel line 40 through the main fuel filter 32 and on to the high pressure circuit 18. With high pressure the fuel is then fed to the common rail 14 and further to the internal combustion engine 2 injection system 16.

Det forsta branslefiltret 30 är foretradelsevis ett finmaskigt, vattenavskiljande filter. I den andra bransletanken 22, uppstroms den forsta branslepumpen 24, är en grovmaskig sil 42 anordnad, igenom vilken den forsta branslepumpen 24 suger bransle. Den grovmaskiga silen 42 filtrerar bort partiklar over en forutbestamd storlek. Den forsta brans- lepumpen 24 trycksatter darefter branslet och matar det igenom det forsta branslefiltret 30, via den forsta bransleledningen 26, vidare till den forsta bransletanken 20. Branslet i den forsta bransletanken 20 har pa sa satt passerat bade en grovmaskig sil 42 och ett finmaskigt forfilter 30, vilket medfor att den andra branslepumpen 28, som är anordnad i den forsta bransletanken 20 är skyddad mot fororeningar. The first fuel filter 30 is preferably a fine mesh, water separating filter. In the second fuel tank 22, upstream of the first fuel pump 24, a coarse mesh screen 42 is provided, through which the first fuel pump 24 sucks fuel. The coarse mesh screen 42 filters out particles over a predetermined size. The first fuel pump 24 then pressurizes the fuel and feeds it through the first fuel filter 30, via the first fuel line 26, on to the first fuel tank 20. The fuel in the first fuel tank 20 has thus passed both a coarse mesh screen 42 and a fine mesh pre-filter 30, which means that the second fuel pump 28, which is arranged in the first fuel tank 20, is protected against contamination.

En styrenhet 44 är anordnad i forbindelse med den forsta branslepumpen och den andra branslepumpen. Styrenheten 44 kan vara en dator med for andamalet lamplig programvara. En annan dator 46 kan vara ansluten till styrenheten 44. Styrenheten 44 är anordnad for att tillhandahalla ett definierat toleransomrade for tryckfall over det forsta branslefiltret 30. Toleransomradet ar lampligen baserat pa ett for andamalet avsett refe- rensbranslefilter. Det vill saga, det definierade toleransomradet är ett toleransomrade for tryckfall som bor erhallas om ett korrekt forsta branslefilter har monterats pa ett korrekt salt i branslesystemet 4. Det definierade toleransomradet kan matas in manuellt hos styrenheten 44 eller automatiskt definieras hos styrenheten 44. Vidare är styrenhe- ten 44 anordnad att styra den forsta branslepumpen 24 att mata bransle fran den andra bransletanken 22 till den forsta bransletanken 20 och berakna ett tryckfall over det forsta branslefiltret 30. Styrenheten 44 är aven anordnad att kontrollera om det beraknade 13 tryckfallet over det fOrsta branslefiltret 30 hr inom det definierade toleransomradet och saledes bestamma om fel har uppstatt vid monteringen av det forsta branslefiltret 30. Styrenheten 44 hr aven anordnad att generera ett felmeddelande om fel har detekterats. Med hjalp av styrenheten 44 kan stromforbrukningen eller effektuttaget/spanningen hos den forsta branslepumpens 24 drivande elektriska motor M1 bestammas. Med stromforbrukningen och/eller spanningen kan styrenheten 44 bestamma den forsta branslepumpens 24 varvtal. Varvtalet kan anvandas av styrenheten 44 for att berakna tryckfallet over det forsta branslefiltret 30. A control unit 44 is arranged in connection with the first fuel pump and the second fuel pump. The control unit 44 may be a computer with software suitable for the purpose. Another computer 46 may be connected to the control unit 44. The control unit 44 is arranged to provide a defined tolerance range for pressure drops across the first fuel filter 30. The tolerance range is suitably based on a reference fuel filter intended for the purpose. That is, the defined tolerance range is a tolerance range for pressure drops that should be obtained if a correct first fuel filter has been mounted on a correct salt in the fuel system 4. The defined tolerance range can be entered manually at the controller 44 or automatically defined at the controller 44. Furthermore, the controller is The controller 44 is arranged to control the first fuel pump 24 to supply fuel from the second fuel tank 22 to the first fuel tank 20 and calculate a pressure drop across the first fuel filter 30. The control unit 44 is also arranged to check whether the calculated pressure drop across the first fuel filter 30 hr within the defined tolerance range and thus determine if faults have occurred during the installation of the first fuel filter 30. The control unit 44 hr also arranged to generate an error message if faults have been detected. With the aid of the control unit 44, the power consumption or the power output / voltage of the driving electric motor M1 of the first fuel pump 24 can be determined. With the power consumption and / or the voltage, the control unit 44 can determine the speed of the first fuel pump 24. The speed can be used by the control unit 44 to calculate the pressure drop across the first fuel filter 30.

En nivagivare 48 hr anordnad hos den forsta bransletanken 20 for att identifiera brans- lenivan i den forsta bransletanken 20. Nivagivaren 48 hr anordnad i forbindelse med styrenheten 44. Styrenheten 44 kan pa sa satt erhalla information om nivhforandringen av branslevolymen i den forsta bransletanken 20 under en pa forhand bestamd tid. Med nivaforandringen kan styrenheten 44 bestamma flodet genom det forsta branslefiltret 30 och baserat pa flodet kan styrenheten 44 berakna tryckfallet over det forsta bransle- filtret 30. Under normal drift av branslesystemet 4 kan nivagivaren 48 anvandas for att avgora nar branslenivan i den forsta bransletanken 20 understiger en viss niva, varvid den forsta branslepumpen 24 styrs att mata bransle frail den andra bransletanken 22 till den forsta bransletanken 20. A level sensor 48 hr arranged at the first fuel tank 20 to identify the fuel level in the first fuel tank 20. The level sensor 48 hr arranged in connection with the control unit 44. The control unit 44 can thus obtain information about the level change of the industry volume in the first fuel tank 20 during a pre-determined time. With the level change, the controller 44 can determine the flow through the first fuel filter 30 and based on the flow, the controller 44 can calculate the pressure drop across the first fuel filter 30. During normal operation of the fuel system 4, the level sensor 48 can be used to determine when the fuel level in the first fuel tank 20 falls below a certain level, wherein the first fuel pump 24 is controlled to supply fuel from the second fuel tank 22 to the first fuel tank 20.

Fig. 3 visar ett flodesschema over ett forfarande for att detektera fel avseende montering av ett branslefilter i ett branslesystem 4 for en forbranningsmotor 2 enligt foreliggande uppfinning. Branslesystemet 4 är lampligen utformat sa som beskrivet i fig. 2 och innefattar saledes en forsta bransletank 20, en andra bransletank 22, en forsta bransleledning 26 anordnad i forbindelse med den forsta bransletanken 20 och den andra bransletanken 22, en forsta branslepump 24 anordnad att mata bransle frail den andra bransletanken 22 till den forsta bransletanken 20 genom den forsta bransleledningen 26, an andra branslepump 28 anordnad att mata bransle fran den forsta bransletanken 20 till en hogtryckskrets 18 i branslesystemet 4 samt ett forsta branslefilter anordnat nedstroms den forsta branslepumpen 24 och uppstroms den andra bransle- pumpen 28. Forfarandet innefattar stegen att: a) definiera ett toleransomrade for tryckfall Over det forsta branslefiltret 30; 14 styra den forsta brdnslepumpen 24 att mata brdnsle fran den andra brdnsletanken 22 till den forsta bransletanken 20 genom det forsta brdnslefiltret 30; berdkna ett tryckfall over det forsta brdnslefiltret 30; och bestamma om fel har uppstatt vid monteringen av det forsta brdnslefiltret 30, genom att kontrollera om det berdknade tryckfallet over det forsta brdnslefiltret 30 är inom det definierade toleransomradet. Fig. 3 shows a flow chart of a method for detecting faults regarding the installation of a fuel filter in a fuel system 4 for an internal combustion engine 2 according to the present invention. The fuel system 4 is suitably designed as described in Fig. 2 and thus comprises a first fuel tank 20, a second fuel tank 22, a first fuel line 26 arranged in connection with the first fuel tank 20 and the second fuel tank 22, a first fuel pump 24 arranged to feed fuel from the second fuel tank 22 to the first fuel tank 20 through the first fuel line 26, a second fuel pump 28 arranged to supply fuel from the first fuel tank 20 to a high pressure circuit 18 in the fuel system 4 and a first fuel filter arranged downstream of the first fuel pump 24 and upstream of it. the second fuel pump 28. The method comprises the steps of: a) defining a tolerance range for pressure drop across the first fuel filter 30; 14 controlling the first fuel pump 24 to supply fuel from the second fuel tank 22 to the first fuel tank 20 through the first fuel filter 30; calculate a pressure drop across the first fuel filter 30; and determining if errors have occurred during the mounting of the first fuel filter 30, by checking whether the calculated pressure drop across the first fuel filter 30 is within the defined tolerance range.

Om det berdknade tryckfallet over det forsta brdnslefiltret 30 ligger utanfor det definierade toleransomradet, och ett fel saledes har detekterats, kan felet hero pa att det forsta branslefiltret 30 är felmonterat eller att fel brdnslefilter har monterats. If the calculated pressure drop across the first fuel filter 30 is outside the defined tolerance range, and a fault has thus been detected, the fault may be due to the first fuel filter 30 being incorrectly fitted or the wrong fuel filter being fitted.

Det definierade toleransonuidet baseras foretradesvis pa ett for andamalet avsett referensbrdnslefilter. Pa sa sat erhalles ett toleransomrade inom vilket tryckfallet horde ligga, ndr ett for dndamalet av sett brdnslefilter har monterats pa ett korrekt sat. Det definierade toleransomrddet kan aven baseras pa typ av brdnsle i brdnslesystemet 4. The defined tolerance noise is preferably based on a reference fuel filter intended for the purpose. In this way, a tolerance range is obtained within which the pressure drop should lie, when one for the purpose of the set fuel filter has been mounted in a correct manner. The defined tolerance range can also be based on the type of fuel in the fuel system 4.

Saledes definieras toleransomradet ldmpligen med hansyn tagen till vilken typ av brdnslefilter som är avsett for dndamalet och/eller vilken typ av brdnsle som är avsett for andamalet. Thus, the tolerance range is defined, in particular, with regard to the type of fuel filter intended for the second part and / or the type of fuel intended for the second part.

Foretrddesvis berdknas tryckfallet Over det forsta brdnslefiltret 30 i steget c) baserat pa ett flode genom det forsta brdnslefiltret 30. Flodet genom det forsta brdnslefiltret 30 bestams foretradesvis genom att mata nivaforandringen hos brdnslet i den forsta bransletanken 20 under en pa forhand bestamd tid, vilken nivaforandring bestams medelst nivagivaren 48 anordnad i den forsta brdnsletanken 20. Genom att avldsa nivagivarens 48 signaler och pa sa sat bestamma hur brdnslevolymen i den forsta brdnsletanken har forandrats under en viss tid kan flodet genom det forsta brdnslefiltret 30 bestammas. Alternativt kan flodet bestammas genom att mad hur lang tid det tar att medelst den forsta brdnslepumpen 24 fylla den forsta brdnsletanken 20. Preferably, the pressure drop across the first fuel filter 30 is calculated in step c) based on a flow through the first fuel filter 30. The flow through the first fuel filter 30 is preferably determined by feeding the level change of the fuel in the first fuel tank 20 during a predetermined time. is determined by means of the level sensor 48 arranged in the first fuel tank 20. By observing the signals of the level sensor 48 and thereby determining how the fuel volume in the first fuel tank has changed during a certain time, the flow through the first fuel filter 30 can be determined. Alternatively, the flow can be determined by measuring how long it takes to fill the first fuel tank 20 by means of the first fuel pump 24.

Foretrddesvis berdknas tryckfallet Over det forsta brdnslefiltret 30 aven baserat pa den forsta brdnslepumpens 24 varvtal och/eller stromforbrukning. Den forsta brdnslepumpens 24 varvtal kan bestammas genom att mata den forsta elektriska maskinens Ml (och darmed den forsta branslepumpens 24) spanning eller stromforbrukning. Genom att mata den forsta branslepumpens 24 varvtal och/eller stromforbrukning kan flodet som den forsta branslepumpen 24 genererar bestammas. Genom att jamfora det faktiska bestamda flodet genom det forsta branslefiltret 30 med flodet som den forsta brans- lepumpen 24 genererar, kan tryckfallet over det forsta branslefiltret 30 beraknas. Preferably, the pressure drop across the first fuel filter 30 is also calculated based on the speed and / or power consumption of the first fuel pump 24. The speed of the first fuel pump 24 can be determined by feeding the voltage or power consumption of the first electric machine M1 (and thus the first fuel pump 24). By feeding the speed and / or power consumption of the first fuel pump 24, the flow generated by the first fuel pump 24 can be determined. By comparing the actual determined flow through the first fuel filter 30 with the flow generated by the first fuel pump 24, the pressure drop across the first fuel filter 30 can be calculated.

Foretradesvis beraknas tryckfallet over det forsta branslefiltret 30 aven baserat pa temperaturen hos branslet i den forsta bransletanken 20. Genom att avlasa temperaturen hos branslet i den forsta bransletanken 20, medelst en temperaturgivare (ej visad), kan branslets viskositet bestammas. Viskositeten hos branslet kan paverka tryckfallet over det forsta branslefiltret 30 och genom att ta hansyn till viskositeten kan tryckfallet beraknas pa ett noggrant och tillforlitligt sat. Preferably, the pressure drop across the first fuel filter 30 is also calculated based on the temperature of the fuel in the first fuel tank 20. By reading the temperature of the fuel in the first fuel tank 20, by means of a temperature sensor (not shown), the viscosity of the fuel can be determined. The viscosity of the industry can affect the pressure drop across the first industry filter 30 and by taking into account the viscosity, the pressure drop can be calculated in an accurate and reliable manner.

Foretradesvis innefattar steget d) att generera ett felmeddelande nar fel har detekterats. Preferably, step d) comprises generating an error message when an error has been detected.

Felmeddelandet kan lampligen presenteras i fordonet 1 for foraren eller i ett diagnos- verktyg vid en verkstad eller ett servicestalle. Pa sa sat kan det detekterade felet synliggoras och atgardas. Felmeddelandet kan sparas i en hos fordonet 1 anordnad styrenhet 44. The error message can conveniently be presented in the vehicle 1 for the driver or in a diagnostic tool at a workshop or a service stall. In this way, the detected error can be made visible and corrected. The error message can be saved in a control unit 44 arranged with the vehicle 1.

Lampligen innefattar steget d) att begransa bransletillforseln till forbranningsmotorn 2 nar fel har detekterats. Lampligen begransas bransletillforseln till forbranningsmotorn 2 genom att den forsta branslepumpen 24 styrs, sa att bransleflodet till den forsta bransletanken 20 begransas. Alternativt styrs den andra branslepumpen 28, sa att bransletillforseln till hogtryckskretsen 18 begransas. Genom att begransa bransletill- forseln till forbranningsmotorn 2 begransas framforandet av fordonet 1 sa lange som felet kvarstar. Nar felet har atgardats upphor lampligen begransningen av bransletillforseln. Pa sa salt sakerstalls exempelvis att inte ett branslefilter med samre filtreringsegenskaper an ett for andamalet avsett referensbranslefilter anvands. Darmed astadkommes ett forfarande for att detektera fel avseende montering av branslefilter i ett branslesystem 4, som minimerar risken for driftstorningar. Alternativt innefattar steget d) att forhindra start av forbranningsmotorn 2 nar det beraknade tryckfallet ligger utan- 16 for toleransomradet och fel avseende monteringen av ett branslefilter darmed har detekterats. Appropriately, step d) comprises limiting the fuel supply to the internal combustion engine 2 when faults have been detected. Lamply, the fuel supply to the combustion engine 2 is limited by controlling the first fuel pump 24, so that the fuel flow to the first fuel tank 20 is limited. Alternatively, the second fuel pump 28 is controlled so that the fuel supply to the high pressure circuit 18 is limited. By limiting the fuel supply to the internal combustion engine 2, the performance of the vehicle 1 is limited as long as the fault remains. Once the fault has been rectified, the limitation of the industry supply will probably cease. In such a case, it is ensured, for example, that an industry filter with better filtration properties than a reference industry filter intended for the purpose is not used. This provides a method for detecting faults regarding the installation of fuel filters in a fuel system 4, which minimizes the risk of operational disturbances. Alternatively, step d) comprises preventing starting of the internal combustion engine 2 when the calculated pressure drop is outside the tolerance range and errors regarding the mounting of an industry filter have thus been detected.

Lampligen utfors stegen a)-d) i samband med byte av det forsta branslefiltret 30 eller montering av det forsta branslefiltret 30. Pa sà sat kan fel avseende monteringen av branslefiltret 30 detekteras i ett tidigt skede och felet kan atgardas fore allvarliga konsekvenser sasom driftsstorningar uppkommer. Steps a) -d) are suitably performed in connection with the replacement of the first fuel filter 30 or the installation of the first fuel filter 30. In this way, errors regarding the mounting of the fuel filter 30 can be detected at an early stage and the fault can be avoided for serious consequences such as operational disturbances. .

Enligt uppfinningen tillhandahalles ett i styrenheten 44 och/eller datorn 46 lagrat da- torprogram P, som kan innefatta rutiner for att detektera fel avseende montering av ett branslefilter enligt hari beskrivet forfarande. According to the invention, a computer program P stored in the control unit 44 and / or the computer 46 is provided, which may comprise routines for detecting errors regarding the installation of an industry filter according to the method described herein.

Programmet P kan vara lagrat pa ett exekverbart vis eller pa komprimerat vis i ett mine M och/eller i ett las/skrivminne. The program P can be stored in an executable manner or in a compressed manner in a memory M and / or in a read / write memory.

Uppfinningen avser ocksà en datorprogramprodukt innefattande en programkod lagrad pa ett, av en dator lasbart, medium for att utfora hari beskrivna forfarandestegen, nar namnda programkod kors pa styrenheten 44 eller en annan dator 46 ansluten till styrenheten 44. The invention also relates to a computer program product comprising a program code stored on a medium readable by a computer for performing the method steps described therein, when said program code is crossed on the control unit 44 or another computer 46 connected to the control unit 44.

Namnda programkod kan vara icke flyktigt lagrad pa namnda av en dator 46 lasbara medium. Said program code may be non-volatile stored on said computer 46 readable medium.

Angivna komponenter och sardrag som anges ovan kan inom ramen for uppfinningen kombineras mellan olika angivna utforanden. 17 The stated components and features mentioned above can be combined within the scope of the invention between different specified embodiments. 17

Claims (16)

Patentkrav 1. Forfarande for detektering av fel avseende montering av ett branslefilter i ett branslesystem (4) for en forbranningsmotor (2), vilket branslesystem (4) innefattar en forsta bransletank (20), en andra bransletank (22), en forsta bransleledning (26) anordnad i forbindelse med den forsta bransletanken (20) och den andra bransletanken (22), en forsta branslepump (24) anordnad att mata bransle fran den andra bransletanken (22) till den forsta bransletanken (20) genom den forsta bransleledningen (26), en andra branslepump (28) anordnad att mata bransle fran den forsta bransletanken (20) till en hogtryckskrets (18) hos branslesystemet (4) samt ett forsta branslefilter (30) anordnat nedstroms den forsta branslepumpen (24) och uppstroms den andra branslepumpen (28), kannetecknat av stegen att:A method for detecting faults regarding the installation of a fuel filter in a fuel system (4) for an internal combustion engine (2), which fuel system (4) comprises a first fuel tank (20), a second fuel tank (22), a first fuel line ( 26) arranged in connection with the first fuel tank (20) and the second fuel tank (22), a first fuel pump (24) arranged to supply fuel from the second fuel tank (22) to the first fuel tank (20) through the first fuel line (26). ), a second fuel pump (28) arranged to supply fuel from the first fuel tank (20) to a high pressure circuit (18) of the fuel system (4) and a first fuel filter (30) arranged downstream of the first fuel pump (24) and upstream of the second fuel pump (28), characterized by the steps of: 1. definiera ett toleransomrade for tryckfall over det forsta branslefiltret (30); 2. styra den forsta branslepumpen (24) att mata bransle fran den andra bransletanken (22) till den forsta bransletanken (20) genom det forsta branslefiltret (30); 3. berakna ett tryckfall over det forsta branslefiltret (30); och 4. bestamma om fel har uppstatt vid monteringen av det forsta branslefiltret (30), genom att kontrollera om det beraknade tryckfallet är inom det definierade toleransomradet.1. define a tolerance range for pressure drop across the first fuel filter (30); 2. controlling the first fuel pump (24) to supply fuel from the second fuel tank (22) to the first fuel tank (20) through the first fuel filter (30); 3. calculate a pressure drop across the first fuel filter (30); and 4. determining if an error has occurred during the installation of the first fuel filter (30), by checking whether the calculated pressure drop is within the defined tolerance range. 2. Forfarande enligt krav 1, varvid ett detekterat fel indikerar att det forsta branslefiltret (30) är felmonterat eller att fel typ av branslefilter har monterats.The method of claim 1, wherein a detected fault indicates that the first fuel filter (30) is incorrectly mounted or that the wrong type of fuel filter has been mounted. 3. Forfarande enligt krav 1 eller 2, varvid det definierade toleransomradet i steget a) baseras pa ett for andamalet avsett referensbranslefilter.A method according to claim 1 or 2, wherein the defined tolerance range in step a) is based on a reference fuel filter intended for the purpose. 4. Forfarande enligt nagot av foregaende krav, varvid det beraknade tryckfallet i steget c) baseras pa ett flode genom det forsta branslefiltret (30).A method according to any one of the preceding claims, wherein the calculated pressure drop in step c) is based on a flow through the first fuel filter (30). 5. Forfarande enligt krav 4, varvid flodet genom det forsta branslefiltret (30) bestams genom att mata nivaforandringen hos branslet i den forsta bransletanken (20) under en 18 pa forhand bestamd tid, vilken nivaforandring bestams medelst en nivagivare (48) anordnad i den forsta bransletanken (20).A method according to claim 4, wherein the flow through the first fuel filter (30) is determined by feeding the level change of the fuel in the first fuel tank (20) for a predetermined time, which level change is determined by means of a level sensor (48) arranged in the first industry thought (20). 6. Forfarande enligt nagot av foregaende krav, varvid det beraknade tryckfallet i steget c) baseras pa den forsta branslepumpens (24) varvtal och/eller stromforbrukning.A method according to any one of the preceding claims, wherein the calculated pressure drop in step c) is based on the speed and / or power consumption of the first fuel pump (24). 7. Forfarande enligt nagot av foregaende hay, varvid det beraknade tryckfallet i steget c) baseras pa temperaturen hos branslet i den forsta bransletanken (20).A method according to any one of the preceding claims, wherein the calculated pressure drop in step c) is based on the temperature of the fuel in the first fuel tank (20). 8. Forfarande enligt nagot av foregaende hay, varvid steget d) vidare innefattar att generera ett felmeddelande nar fel har detekterats.A method according to any preceding hay, wherein step d) further comprises generating an error message when an error has been detected. 9. Forfarande enligt nagot av foregaende hay, varvid steget d) vidare innefattar att begransa bransletillforseln till forbranningsmotorn (2) nar fel har detekterats.A method according to any preceding hay, wherein step d) further comprises limiting the fuel supply to the internal combustion engine (2) when faults have been detected. 10. Branslesystem (4) for en forbranningsmotor (2), innefattande en forsta bransletank (20), en andra bransletank (22), en forsta bransleledning(26) anordnad i forbindelse med den forsta bransletanken (20) och den andra bransletanken (22), en forsta branslepump (24) anordnad att mata bransle fran den andra bransletanken (22) till den forsta bransletanken (20) genom den forsta bransleledningen (26), en andra branslepump (28) anordnad att mata bransle fran den forsta bransletanken (20) till en hogtryckskrets (18) hos branslesystemet (4) samt ett forsta branslefilter (30) anordnat nedstroms den forsta branslepumpen (24) och uppstroms den andra branslepumpen (28), kannetecknad av att en styrenhet (44) är anordnad att tillhandahalla ett definierat toleransomrade for tryckfall over det forsta branslefiltret (30), styra den forsta branslepumpen (24) att mata bransle fran den andra bransletanken (22) till den forsta bransletanken (20) genom det forsta branslefiltret (30), berakna ett tryckfall over det forsta branslefiltret (30) och bestamma om fel har uppstAtt vid monteringen av det forsta branslefiltret (30) genom att kontrollera om det beraknade tryckfallet är inom det definierade toleransomra- det. 19Fuel system (4) for an internal combustion engine (2), comprising a first fuel tank (20), a second fuel tank (22), a first fuel line (26) arranged in connection with the first fuel tank (20) and the second fuel tank (22 ), a first fuel pump (24) arranged to supply fuel from the second fuel tank (22) to the first fuel tank (20) through the first fuel line (26), a second fuel pump (28) arranged to feed fuel from the first fuel tank (20). ) to a high pressure circuit (18) of the fuel system (4) and a first fuel filter (30) arranged downstream of the first fuel pump (24) and upstream of the second fuel pump (28), characterized in that a control unit (44) is arranged to provide a defined tolerance range for pressure drop across the first fuel filter (30), directing the first fuel pump (24) to feed fuel from the second fuel tank (22) to the first fuel tank (20) through the first fuel filter (30), calculating a pressure drop over the first fuel filter (30) and determine if an error has occurred during the installation of the first fuel filter (30) by checking whether the calculated pressure drop is within the defined tolerance range. 19 11. Branslesystem enligt krav 10, varvid en nivagivare (48) är anordnad i den forsta bransletanken (20).A fuel system according to claim 10, wherein a level sensor (48) is arranged in the first fuel tank (20). 12. Branslesystem enligt krav 11, varvid styrenheten (44) är anordnad i forbindelse med den forsta bran slepumpen (24) och nivagivaren (48).A fuel system according to claim 11, wherein the control unit (44) is arranged in connection with the first fuel pump (24) and the level sensor (48). 13. Forbranningsmotor (2) kannetecknad av att den innefattar ett branslesystem (4) enligt nagot av haven 10-12.Internal combustion engine (2) characterized in that it comprises a fuel system (4) according to any one of the terms 10-12. 14. Fordon (1) kannetecknat av att det innefattar ett branslesystem (4) enligt nagot av haven 10-12.Vehicle (1) characterized in that it comprises a fuel system (4) according to any one of the oceans 10-12. 15. Datorprogram (P) for detektering av fel avseende montering av ett branslefilter i ett branslesystem (4) for en forbranningsmotor (2), dar namnda datorprogram (P) innefat- 1 tar programkod for att orsaka en elektronisk styrenhet (44) eller en annan dator (46) ansluten till den elektroniska styrenheten (44) att utfora stegen enligt nagot av patent-haven 1-9.Computer program (P) for detecting errors regarding the installation of an industry filter in an industry system (4) for an internal combustion engine (2), wherein said computer program (P) comprises 1 program code for causing an electronic control unit (44) or a another computer (46) connected to the electronic control unit (44) to perform the steps according to any of the patents 1-9. 16. Datorprogramprodukt innefattande en programkod lagrad pa ett, av en dator las- hart, medium for att utfora forfarandestegen enligt nagot av patentkraven 1-9, nar namnda programkod kors pa en elektronisk styrenhet (44) eller en annan dator (46) ansluten till den elektroniska styrenheten (44). 113 Z .6!d OZ 9C HAI 91 Z OC r, .9999,6 6999,6 699,6 ' 9 -•-•-•-• • •A computer program product comprising a program code stored on a computer readable medium for performing the method steps of any of claims 1-9, when said program code is crossed on an electronic control unit (44) or another computer (46) connected to the electronic control unit (44). 113 Z .6! D OZ 9C HAI 91 Z OC r, .9999.6 6999.6 699.6 '9 - • - • - • - • • •
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FR2787143B1 (en) * 1998-12-14 2001-02-16 Magneti Marelli France DETECTION OF FOULING OF A FUEL FILTER OF A SUPPLY CIRCUIT OF AN INTERNAL COMBUSTION ENGINE
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