SE537172C2 - Combustion engine fuel system, internal combustion engine with such a fuel system, vehicles with such a fuel system and a method for reducing the risk of malfunctioning fuel caused by paraffin fuel in a fuel system - Google Patents

Combustion engine fuel system, internal combustion engine with such a fuel system, vehicles with such a fuel system and a method for reducing the risk of malfunctioning fuel caused by paraffin fuel in a fuel system Download PDF

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Publication number
SE537172C2
SE537172C2 SE1350721A SE1350721A SE537172C2 SE 537172 C2 SE537172 C2 SE 537172C2 SE 1350721 A SE1350721 A SE 1350721A SE 1350721 A SE1350721 A SE 1350721A SE 537172 C2 SE537172 C2 SE 537172C2
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Sweden
Prior art keywords
fuel
fuel tank
transfer pump
line
filter
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SE1350721A
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Swedish (sv)
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SE1350721A1 (en
Inventor
Dan Cedfors
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Scania Cv Ab
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Publication date
Application filed by Scania Cv Ab filed Critical Scania Cv Ab
Priority to SE1350721A priority Critical patent/SE537172C2/en
Priority to DE112014002283.7T priority patent/DE112014002283T5/en
Priority to PCT/SE2014/050697 priority patent/WO2014200425A1/en
Publication of SE1350721A1 publication Critical patent/SE1350721A1/en
Publication of SE537172C2 publication Critical patent/SE537172C2/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • 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
    • F02D33/006—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 depending on engine operating conditions, e.g. start, stop or ambient 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
    • 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
    • F02D41/3082—Control of electrical fuel pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M37/0076—Details of the fuel feeding system related to the fuel tank
    • F02M37/0088—Multiple separate fuel tanks or tanks being at least partially partitioned
    • 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
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/18—Feeding by means of driven pumps characterised by provision of main and auxiliary pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M37/40—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 with means for detection of clogging
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/021—Engine temperature

Abstract

537 172 Sammandrag Uppfinningen avser ett branslesystem for en forbranningsmotor (2), vilket branslesystem (4) innefattar en forsta bransletank (20) , en andra bransletank (22), en forsta bransleledning (36) anordnad i forbindelse med den forsta bransletanken (20) och den andra bransletanken (22) , en andra bransleledning (40) anordnad i forbindelse med den forsta bransletanken (20), en huvudmatarpump (26) anordnad att mata bransle frail den forsta bransletanken (20) genom den andra bransleledningen (40) till ett hogtryckssystem (19), en transferpump (28) anordnad att mata bransle frail den andra bransletanken (22) till den forsta bransletanken (20) via den forsta bransleledningen (36) samt ett forfilter (30) anordnat nedstroms transferpumpen (28). En forsta elektrisk motor (MI) är anordnad att driva transferpumpen (28), van i transferpumpen (28) är omriktningsbar, sâ att flodesriktningen genom forfiltret (30) och den forsta bransleledningen (36) kan vandas nar risk for paraffinering av bransle har identifierats. Uppfinningen avser Liven ett forfarande fOr att minska risken fOr driftstorningar orsakade av 1 paraffinerat bransle i ett branslesystem. 537 172 Summary The invention relates to a fuel system 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 (36) arranged in connection with the first fuel tank (20). and the second fuel tank (22), a second fuel line (40) arranged in connection with the first fuel tank (20), a main feed pump (26) arranged to supply fuel frail the first fuel tank (20) through the second fuel line (40) to a high pressure system (19), a transfer pump (28) arranged to supply fuel from the second fuel tank (22) to the first fuel tank (20) via the first fuel line (36) and a pre-filter (30) arranged downstream of the transfer pump (28). A first electric motor (MI) is arranged to drive the transfer pump (28), used in the transfer pump (28) is divertable, so that the flow direction through the pre-filter (30) and the first fuel line (36) can be irrigated when the risk of paraffining of fuel has been identified. . The invention relates to Liven a method for reducing the risk of operational disturbances caused by a paraffined industry in an industry system.

Description

537 172 SOkande: Scania CV AB Branslesystem for forbranningsmotor, forbranningsmotor med ett sidant branslesystem, fordon med ett sAdant branslesystem och ett forfarande for att minska risken for driftstorningar orsakade av paraffinerat bransle i ett branslesystem UPPFINNINGENS BAKGRUND OCH KAND TEKNIK Foreliggande uppfinning avser ett brdnslesystem for en forbranningsmotor enligt pa- tentkravet 1. Uppfinningen avser ocksa en forbranningsmotor med ett sadant bransle- system enligt patentkravet 11, ett fordon med ett sadant branslesystem enligt patentkravet 12 samt ett forfarande for att minska risken for driftstorningar orsakade av paraffinerat bransle i ett brdnslesystem enligt patentkravet 13. 537 172 APPLICATION: Scania CV AB Combustion engine fuel system, internal combustion engine combustion engine, vehicle with such a fuel system and a procedure to reduce the risk of malfunctions caused by paraffinous fuel in a fuel system BACKGROUND OF THE INVENTION AND BASE TECHNOLOGY The invention also relates to an internal combustion engine with such a fuel system according to claim 11, a vehicle with such a fuel system according to claim 12 and a method for reducing the risk of malfunctions caused by paraffined fuel in a fuel system according to claim 13. .

En forbranningsmotor, sasom en kolvmotor, vilken drivs av diesel eller bensin, är for- sedd med ett branslesystem fOr att transportera branslet fran en eller flera brdnsletankar till forbranningsmotorns insprutningssystem. Branslesystemet innefattar en eller flera brdnslepumpar, som kan drivas mekaniskt av forbranningsmotorn eller drivas av en elmotor. Branslepumparna skapar ett bransleflode och tryck for att transportera brans- let till en ackumulator som kan vara i form av en sa kallad common rail och vidare till forbrdnningsmotorns insprutningssystem, vilket tillfor brdnslet till forbrdnningsmotarns 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 internal combustion engine's injection system. The fuel system comprises one or more fuel pumps, which can 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 an accumulator which can be in the form of a so-called common rail and on to the internal combustion engine's injection system, which supplies the fuel to the internal combustion engine's 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.

Branslesystem innefattar aven brdnslefilter for filtrering av brdnslet innan det nar forbrdnningsmotorns insprutningssystem. Forbranningsmotorn och dess insprutningssystem är kansliga for kontamineringar och kan paverkas negativt om branslet är allt for fororenat. Kontamineringar kan avse fasta partiklar, gas eller vatska. Aven om branslet endast innefattar en liten mangd kontamineringar kan konsekvensen bli att forbran- ningsmotorn inte kan drivas av brdnslet. Branslesystem innefattar dad& brdnslefilter, som bade bortfiltrerar partiklar samt separerar vatten, som forekommer i brdnslet. 1 537 172 Branslefiltret kan vara ett sa kallat insatsbranslefilter, vilket innefattar ett utbytbart filterelement, vilket är anordnat i ett filterhus. Nar temperaturen utomhus sjunker kan branslet, sa som diesel eller biodiesel, som fOrefinns i branslesystemet paraffineras. Temperaturen vid vilken branslet paraffineras beror pa branslets sammansattning och kan for ett antal olika branslesammansattningar variera mellan plus 10 grader till mi- nus 50 grader. I de fall da bransle forefinns i branslefiltrets filterhus kan paraffineringen leda till att branslefiltret igensatts, vilket medfor att bransle inte kan na forbranningsmotorn vid kallstart. Bransle som forefinns i bransleledningar kan likasa paraffineras och orsaka stopp i bransleledningama. Det är dad& onskvart att minimera ris- ken for att bransle i filterhus och bransleledningar paraffineras i kall vaderlek. 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 industry is too polluted. Contamination can refer to solid particles, gas or liquid. Even if the industry only involves a small amount of contamination, the consequence may be that the internal combustion engine cannot be driven by the fuel. Fuel systems include fuel filters, which both filter out particles and separate water present in the fuel. The fuel filter may be a so-called input fuel filter, which comprises a replaceable filter element, which is arranged in a filter housing. When the temperature outside drops, the industry, such as diesel or biodiesel, which is present in the industry system, can be paraffined. The temperature at which the industry is paraffined depends on the composition of the industry and can for a number of different industry compositions vary between plus 10 degrees to minus 50 degrees. In cases where fuel is present in the filter filter of the fuel filter, the paraffination can lead to the fuel filter being clogged, which means that the fuel cannot reach the internal combustion engine during a cold start. Fuel that is present in industry lines can also be paraffined and cause blockages in the industry lines. It is important to minimize the risk of industry in filter houses and industry lines being paraffined in cold weather.

Det är forut kant att anordna en omriktningsbar branslepump for att andra flodesriktningen i ett branslesystem och pa sa salt tomma bransleledningar pa bransle. It is a good idea to arrange a divertable fuel pump in order to change the direction of the river in a fuel system and on such salt empty fuel lines on fuel.

I dokumentet EP-0186262 visas ett branslesystem for en forbranningsmotor, vilket innefattar en branslepump och en tudelad bransletank. När forbranningsmotorn har stangts av andras branslepumpens riktning, sa att bransleledningama toms pa bransle. Pa sa satt minskas risken for att paraffinerat bransle orsakar stopp i bransleledningarna. En mindre del av bransletanken innefattar en varmare och vid start av fordonet fylls fOrst den mindre delen, sa att branslet kan varmas upp innan det pumpas ut i bransle- ledningarna. Branslepumpen i dokument EP-0186262 andrar saledes alltid riktning nar forbranningsmotom har stangts av, oavsett om risk for paraffinering foreligger eller inte. Document EP-0186262 discloses a fuel system for an internal combustion engine, which includes a fuel pump and a two-part fuel tank. When the internal combustion engine has been shut off by the direction of the fuel pump of others, then the fuel lines are emptied of fuel. In this way, the risk of paraffined fuel causing a stop in the branch lines is reduced. A smaller part of the fuel tank includes a heater and when starting the vehicle, the smaller part is first filled, so that the fuel can be heated before it is pumped out into the fuel lines. The fuel pump in document EP-0186262 thus always changes direction when the combustion engine has been switched off, regardless of whether there is a risk of paraffination or not.

Det är aven forut kant att anordna en elektriskt styrd omriktningsbar branslepump for att kunna andra flodesriktningen i ett branslesystem. It is also a step forward to arrange an electrically controlled reversible fuel pump to be able to change the direction of the river in a fuel system.

I dokumentet US-2010/0031930 visas ett branslesystem for en forbranningsmotor, vilket innefattar en elektriskt driven branslepump, vilken f6rser branslesystemets in- sprutningssystem med bransle. Den elektriskt drivna branslepumpen matar i ett forsta lage bransle fran en bransletank till motom och i ett andra lage matar branslepumpen bransle fran bransletanken till en anordning for regenerering av partikelfiltret. Det for- 2 537 172 sta och det andra laget motsyaras av olika rotationsriktningar hos den elektriskt drivna branslepumpen. Document US-2010/0031930 discloses a fuel system for an internal combustion engine, which includes an electrically driven fuel pump, which supplies the fuel system injection system with fuel. The electrically driven fuel pump feeds in a first layer fuel from a fuel tank to the engine and in a second layer the fuel pump feeds fuel from the fuel tank to a particle filter regeneration device. The first and second layers are counteracted by different directions of rotation of the electrically driven fuel pump.

Trots kdnda losningar pa omradet finns ett behov av att yidareutveckla ett branslesy- stem, som minskar risken for komplikationer och driftstorningar i samband med kall vaderlek. Despite known solutions in the area, there is a need to further develop an industry management system that reduces the risk of complications and operational disruptions in connection with cold weather.

SAMMANFATTNING AV UPPFINNINGEN Syftet med foreliggande uppfinning är att astadkomma ett branslesystem for en for- branningsmotor, som minskar risken for driftstorningar orsakade ay paraffinerat brans-le. SUMMARY OF THE INVENTION The object of the present invention is to provide a fuel system for an internal combustion engine which reduces the risk of malfunctions caused by a paraffined fuel.

Annu ett syfte med uppfinningen är att astadkomma ett brdnslesystem air en forbran- ningsmotor, som minskar risken for att bransle blir staende hos branslefiltret yid kall vaderlek. Another object of the invention is to provide a fuel system for an internal combustion engine which reduces the risk of fuel remaining at the fuel filter during cold weather.

Ytterligare ett syfte med uppfinningen är att astadkomma ett branslesystem for en airbranningsmotor, som är flexibelt och som har ett brett styrintervall. A further object of the invention is to provide a fuel system for an air combustion engine which is flexible and which has a wide control range.

Annu ett syfte med uppfinningen är att astadkomma ett brdnslesystem for en forbrdnningsmotor, som är icke-skrymmande. Another object of the invention is to provide a fuel system for an internal combustion engine which is non-bulky.

Ytterligare ett syfte med uppfinningen är att astadkomma ett branslesystem for for- branningsmotor, som underldttar kallstart. A further object of the invention is to provide an internal combustion engine fuel system which facilitates cold start.

Dcssa syften uppnas med ctt branslesystem av det inledningsvis ndmnda slagct, yilken kannetecknas av de sardrag som anges i patentkravets 1 kannetecknande del. These objects are achieved with a fuel system of the kind mentioned in the introduction, which can be characterized by the features stated in the characterizing part of claim 1.

Dessa syften uppnas dven med en forbranningsmotor med ett sadant branslesystem enligt patentkravets 11 kannetecknande del, ett fordon med ett sadant branslesystem enligt patentkravets 12 kannetecknande del och ett forfarande for att minska risken for 3 537 172 driftstorningar orsakade av paraffinerat brdnsle i ett branslesystem enligt patentkravets 13 kdnnetecknande del. These objects are further achieved with an internal combustion engine with such a fuel system according to the marking part of claim 11, a vehicle with such a fuel system according to the pitched part of claim 12 and a method for reducing the risk of 3,537,172 malfunctions caused by paraffined fuel in a fuel system according to claim 13. kdnnetecknande del.

Genom att anordna en elektriskt styrd omriktningsbar transferpump, i en lagtryckskrets i brdnslesystemet for en forbranningsmotor, sa att bransleflodet genom forfiltret och den forsta bransleledningen kan vandas ndr risk for paraffinering av brdnsle har identifierats, astadkommes ett branslesystem, som minskar risken for komplikationer och driftstorningar orsakat av paraffinerat brdnsle. Ldmpligen innefattar forfiltret ett utbytbart filterelement, vilket är anordnat i ett filterhus. Foretrddesvis är transferpumpen en lagtryckspump. By arranging an electrically controlled reversible transfer pump, in a low pressure circuit in the fuel system of an internal combustion engine, so that the fuel flow through the pre-filter and the first fuel line can be reduced if the risk of paraffin refueling has been identified, an industry system is created which reduces the risk of complications. of paraffined fuel. Typically, the pre-filter comprises a replaceable filter element, which is arranged in a filter housing. Preferably, the transfer pump is a low pressure pump.

Lampligen andras transferpumpens riktning da forbrdnningsmotom är avstangd och risk for paraffinering av brdnsle foreligger. Pa sa sift minskas risken for att paraffinerat bransle igensatter transferfiltret eller orsakar stopp i den fOrsta bransleledningen. Igen- satt transferfilter och/eller stopp i brdnsleledningen medfor att brdnsle inte matas till den forsta bransletanken, vilket i sin tur medfor att forbranningsmotorn inte kan fOrses med brdnsle. Genom att tomma filterhus och brdnsleledning enbart da risk for paraffinering hos branslet foreligger undviks onOdig tOmning av filterhuset och brdnsleledningen for de fall da risk for paraffinering inte foreligger. Altemativt andras transfer- pumpens riktning da forbranningsmotorn är i drift och risk for paraffinering av bransle foreligger. The direction of the transfer pump is suitable as the combustion engine is switched off and there is a risk of paraffining of the fuel. In this way, the risk of paraffined fuel clogging the transfer filter or causing a stop in the first branch line is reduced. A clogged transfer filter and / or stop in the fuel line means that fuel is not fed to the first fuel tank, which in turn means that the internal combustion engine cannot be supplied with fuel. By emptying filter housings and fuel lines only when there is a risk of paraffining in the industry, unnecessary emptying of the filter housing and fuel line is avoided in cases where there is no risk of paraffining. Alternatively, the direction of the transfer pump of others when the internal combustion engine is in operation and there is a risk of paraffining of the fuel.

Ldmpligen är transferpumpen omriktningsbar genom att rotationsriktningen hos den till transferpumpen kopplade elektriska motom andras. Alternatively, the transfer pump is reversible by changing the direction of rotation of the electric motor connected to the transfer pump.

Genom att ansluta transferpumpen till en styrenhet via en CAN-buss kan transferpumpen styras mot olika parametrar, sa som tryck i brdnsleledningar, tryckfall Over branslefilter, temperaturer etc. Pa sa saft astadkommes ett branslesystem, som är flexibelt, som har ett bredare styrintervall an kand teknik och som pa sa satt medger en korrekt bransletillforsel till den forsta bransletanken. 4 537 172 FOretradesvis är en grovmaskig sil anordnad vid den ena anden av den forsta brdnsleledningen, beldgen vid botten hos den andra brdnsletanken. Den grovmaskiga silen är sdledes anordnad uppstroms transferpumpen och ferfiltret. Den grovmaskiga silen filtrerar bort partiklar over en forutbestamd storlek och är ett filtreringsorgan som ofta utsatts for paraffinerat bransle. By connecting the transfer pump to a control unit via a CAN bus, the transfer pump can be controlled against various parameters, such as pressure in fuel lines, pressure drop. Over fuel filters, temperatures, etc. In this juice, a fuel system is created that is flexible, has a wider control range. technology and which in this way allows a correct supply of fuel to the first fuel tank. 4 537 172 Preferably, a coarse mesh screen is provided at one end of the first fuel line, the bellows at the bottom of the second fuel tank. The coarse mesh screen is thus arranged upstream of the transfer pump and the filter. The coarse-mesh screen filters out particles over a predetermined size and is a filtering means that is often exposed to paraffined fuel.

Ldmpligen identifieras om risk for paraffinering av brdnsle foreligger genom att math. utomhustemperaturen. Foretradesvis är en forsta temperaturgivare ansluten till styrenheten for att bestamma utomhustemperaturen hos omgivningen ddr fordonet befmner sig. Transferpumpen kan sdledes foretradesvis styras, sâ att dess riktning andras dâ utomhustemperaturen understiger ett visst temperaturgransvarde, som motsvarar den temperatur vid vilken brdnslet paraffineras, och clamed indikerar att risk for paraffinering av brdnsle foreligger. It is usually identified whether there is a risk of paraffining of fuel by math. the outdoor temperature. Preferably, a first temperature sensor is connected to the control unit to determine the outdoor temperature of the environment in which the vehicle is located. The transfer pump can thus preferably be controlled so that its direction changes when the outdoor temperature is below a certain temperature threshold value, which corresponds to the temperature at which the fuel is paraffined, and clamed indicates that there is a risk of paraffining of fuel.

Alternativt identifieras om risk for paraffinering av brdnsle foreligger genom att mata temperaturen hos forbranningsmotorn. Foretradesvis är en andra temperaturgivare ansluten till styrenheten for att bestamma temperaturen hos forbranningsmotorn. Lampligen bestams detta genom att mata temperaturen hos fOrbranningsmotorns kylarvdtska. Temperaturen hos forbranningsmotornikylarvatskan kan indikera om risk for paraffi- nering av brdnsle ffireligger. Transferpumpen kan sdledes foretradesvis styras, sâ att dess riktning andras dâ forbrdnningsmotorns temperatur understiger ett visst temperaturgransvarde, som motsvarar den temperatur vid vilken brdnslet paraffineras, och damned indikerar att risk for paraffinering av brdnsle foreligger. Alternatively, it is identified whether there is a risk of paraffining of fuel by feeding the temperature of the internal combustion engine. Preferably, a second temperature sensor is connected to the control unit to determine the temperature of the internal combustion engine. This is conveniently determined by feeding the temperature of the internal combustion engine coolant. The temperature of the internal combustion engine can indicate whether there is a risk of paraffin refueling. The transfer pump can thus preferably be controlled so that its direction changes when the temperature of the internal combustion engine falls below a certain temperature threshold value, which corresponds to the temperature at which the fuel is paraffined, and the bottom indicates that there is a risk of paraffining of fuel.

Alternativt identifieras om risk fcir paraffinering av brdnsle foreligger genom att be- stamma tryckfallet Over forfiltret. Foretradesvis är en forsta tryckgivare anordnad uppstroms forfiltret och en andra tryckgivarc anordnad nedstroms forfiltret. Med dessa tryckgivare kan tryckfall Over forfiltret bestammas, vilket kan indikera ndr forfiltret borjar bli igensatt. Igensattning av forfiltret kan bero pd helt eller delvis paraffinerat brdnsle och darmed kan tryckfallet Over forfiltret indikera om risk for paraffinering foreligger. Transferpumpen kan ldmpligen styras, sâ att dess riktning andras dâ tryckfallet Over forfiltret overstiger ett visst tryckfallsgransvarde och darmed indikerar att 537 172 risk fOr paraffinering av bransle fOreligger. Tryckgivarna är lampligen differentialtryckgivare och är anslutna till styrenheten. Tryckgivarna avlases foretradesvis nar forbranningsmotorn är i drift. Alternatively, it is identified whether there is a risk of paraffining of fuel by determining the pressure drop across the pre-filter. Preferably, a first pressure sensor is arranged upstream of the pre-filter and a second pressure sensor is arranged downstream of the pre-filter. With these pressure sensors, the pressure drop across the pre-filter can be determined, which can indicate when the pre-filter starts to become clogged. Clogging of the pre-filter may be due to fully or partially paraffined fuel and thus the pressure drop across the pre-filter may indicate whether there is a risk of paraffining. The transfer pump can, for example, be controlled so that its direction changes when the pressure drop across the pre-filter exceeds a certain pressure drop threshold value and thus indicates that there is a risk of paraffining of the industry. The pressure sensors are suitably differential pressure sensors and are connected to the control unit. The pressure sensors are preferably read when the internal combustion engine is in operation.

Igensattning av forfiltret kan orsakas av paraffinering men kan likasa bero pa forore- ningar i branslet. For att kunna avgora om risk for paraffinering foreligger kombineras foretradesvis det identifierade tryckfallet med utomhustemperaturen och/eller forbranningsmotorns temperatur. Transferpumpen kan saledes foretradesvis styras, sa att dess riktning andras da tryckfallet over forfiltret overstiger ett visst tryckfallsgransvarde samtidigt som utomhustemperaturen och/eller forbranningsmotorns temperatur under- stiger ett visst temperaturgransvarde och darmed indikerar att risk for paraffinering av bransle foreligger. Clogging of the pre-filter can be caused by paraffining but can also be due to contaminants in the industry. In order to be able to determine whether there is a risk of paraffining, the identified pressure drop is preferably combined with the outdoor temperature and / or the temperature of the internal combustion engine. The transfer pump can thus preferably be controlled, so that its direction changes when the pressure drop across the pre-filter exceeds a certain pressure drop threshold while the outdoor temperature and / or the temperature of the internal combustion engine falls below a certain temperature threshold and thus indicates a risk of paraffining of fuel.

Altemativt identifieras om risk for paraffinering av bransle foreligger genom att fast- stalla forhallandet mellan transferpumpens arbete och bransleflodet hos den forsta bransleledningen. Lampligen är en flOdesmatare anordnad hos den forsta bransleledningen, vilken flodesmatare är ansluten till styrenheten via CAN-bussen. Stromforbrukningen hos den transferpumpen drivande elmotom mats med hjalp av styrenheten, vilket indikerar hur hart transferpumpen arbetar. Altemativt mats, med hjalp av styren- heten, effektuttaget hos den transferpumpen drivande elmotom. En viss strOmfOrbruk- ning eller ett visst effektuttag hos elmotom motsvarar normalt sett ett visst bransleflode hos den forsta bransleledningen. Saledes innebar en okad stromforbrukning eller ett okat effektuttag att bransleflodet hos den forsta bransleledningen okar. Skulle dock styrenheten identifiera en iikad stromforbrukning eller ett 'Rat effektuttag samtidigt som bransleflodet hos den forsta bransleledningen är oforandrat, kan slutsatsen dras att forfiltret och/eller den grovmaskiga silen troligtvis är igensatta och darmed minskar branslcflodet gcnom den forsta branslcledningen. Igensattningen kan bcro pa heft eller delvis paraffinerat bransle och darmed kan forhallandet mellan transferpumpens arbete och bransleflodet i den forsta bransleledningen indikera att risk for paraffinering av bransle foreligger. Transferpumpen kan lampligen styras, sa att dess riktning andras da forhallandet mellan transferpumpens arbete och bransleflodet hos den forsta bransleledningen indikerar att forfiltret och/eller den grovmaskiga silen är igensatta. Strom- 6 537 172 fOrbrukning och/eller effektuttag samt bransleflOde hos den forsta bransleledningen avldses foretradesvis nar forbranningsmotorn är i drift. Foretradesvis är flodesmdtaren anordnad uppstroms transferpumpen och nedstroms den grovmaskiga silen. Alternativt är flodesmdtaren anordnad nedstroms forfiltret. Alternatively, it is identified whether there is a risk of paraffining of the industry by establishing the relationship between the work of the transfer pump and the industry flow at the first industry management. Lamply, a river feeder is arranged at the first branch line, which river feeder is connected to the control unit via the CAN bus. The power consumption of the transfer motor driving the electric pump is measured with the help of the control unit, which indicates how hard the transfer pump works. Alternative mats, with the help of the control unit, the power outlet of the transfer pump driving electric motor. A certain power consumption or a certain power output of an electric motor normally corresponds to a certain fuel flow in the first fuel line. Thus, an increased power consumption or an increased power output meant that the industry flow of the first industry management increased. However, should the control unit identify a similar power consumption or a 'Rat power output while the fuel flow of the first fuel line is unchanged, it can be concluded that the pre-filter and / or the coarse mesh screen are probably clogged and thus reduce the fuel flow through the first fuel line. The clogging can be due to sticky or partially paraffined fuel, and thus the relationship between the transfer pump's work and the fuel flow in the first fuel line may indicate that there is a risk of paraffining of fuel. The transfer pump can be suitably controlled, so that its direction changes as the relationship between the operation of the transfer pump and the fuel flow of the first fuel line indicates that the pre-filter and / or the coarse mesh screen are clogged. Power consumption and / or power consumption as well as fuel flow at the first fuel line are preferably generated when the internal combustion engine is in operation. Preferably, the flow meter is arranged upstream of the transfer pump and downstream of the coarse mesh screen. Alternatively, the flow meter is arranged downstream of the pre-filter.

Igensattning av forfiltret och/eller den grovmaskiga silen kan orsakas av paraffinerat bransle men kan likasâ bero pa fororeningar i branslet. I syfte att avgara om risk for paraffinering foreligger kombineras foretradesvis det identifierade forhallandet mellan transferpumpens arbete och bransleflodet hos den forsta bransleledningen med utom- 1 0hustemperaturen och/eller forbranningsmotorns temperatur. Transferpumpen kan fore- tradesvis styras, sA att dess riktning andras da forhaftandet mellan transferpumpens arbete och bransleflodet hos den forsta bransleledningen indikerar att forfiltret och/eller den grovmaskiga silen är igensatt, samtidigt som utomhustemperaturen och/eller forbranningsmotorns temperatur understiger ett visst temperaturgriinsvarde. Clogging of the pre-filter and / or the coarse-mesh screen can be caused by paraffined fuel but can also be due to contaminants in the industry. In order to determine whether there is a risk of paraffining, the identified relationship between the operation of the transfer pump and the fuel flow of the first fuel line is preferably combined with the outdoor temperature and / or the temperature of the internal combustion engine. The transfer pump can preferably be controlled so that its direction changes as the adhesion between the transfer pump work and the fuel flow of the first fuel line indicates that the pre-filter and / or the coarse mesh screen is clogged, while the outdoor temperature and / or internal combustion engine temperature is below a certain temperature limit value.

Alternativt identifieras om risk for paraffinering av bransle foreligger genom att kombinera nagra av eller samtliga ovan namnda satt. Exempelvis kan bade utomhustemperaturen, temperaturen hos fOrbranningsmotorn, tryckfallet Over forfiltret och forhallandet mellan transferpumpens arbete och bransleflodet i den forsta bransleledningen an- vandas for att avgora om risk for paraffinering av bransle fcireligger. Alternatively, it is identified whether there is a risk of paraffining of the industry by combining some or all of the above methods. For example, both the outdoor temperature, the temperature of the internal combustion engine, the pressure drop across the pre-filter and the ratio between the operation of the transfer pump and the fuel flow in the first fuel line can be used to determine whether there is a risk of fuel refining.

Foretradesvis avlases den forsta och/eller den andra temperaturgivaren ndr forbranningsmotorn är i drift for att avgora om risk for paraffinering av bransle foreligger. Preferably, the first and / or the second temperature sensor is read when the internal combustion engine is in operation to determine if there is a risk of paraffining of the fuel.

Ldmpligen Ors avlasningen under drift specifikt da. byte av temperaturzon sker. Ldmpligen Ors the unloading during operation specifically da. change of temperature zone takes place.

Alternativt avlases den forsta och/eller den andra temperaturgivaren dA forbranningsmotorn är avstangd och fordonct är stillasthende. Alternatively, the first and / or the second temperature sensor is unloaded when the internal combustion engine is switched off and the vehicle is stationary.

Alternativt sker avlasning av den forsta och/eller den andra temperaturgivaren bade da forbranningsmotorn är i drift och dA forbranningsmotorn är avstangd och fordonet är stillasthende. 7 537 172 FOretradesvis är en ventil anordnad hos den fOrsta brdnsleledningen nedstroms forfiltret. Ventilen är normalt styrd till ett forsta ldge, vilket medfor att den forsta brdnsleledningen star i forbindelse med den forsta bransletanken. Ventilen kan vidare styras till ett andra ldge, vilket medfor att den forsta brdnsleledningen star i forbindelse med brdnslesystemet omgivande luft. Ldmpligen star den forsta bransleledningen i Forbin- delse med omgivande luft via ett luftfilter. Ventilen är foretrddesvis ansluten till styrenheten via CAN-bussen. Alternatively, the first and / or the second temperature sensor is unloaded both when the internal combustion engine is in operation and when the internal combustion engine is switched off and the vehicle is stationary. 7 537 172 Preferably, a valve is provided on the first fuel line downstream of the pre-filter. The valve is normally controlled to a first source, which means that the first fuel line is connected to the first fuel tank. The valve can further be controlled to a second level, which means that the first fuel line is connected to the air surrounding the fuel system. Usually, the first industry line is connected to ambient air via an air filter. The valve is preferably connected to the control unit via the CAN bus.

Ldmpligen styrs ventilen till sitt andra ldge ndr det har identifierats att risk for paraffi- nering av brdnsle foreligger. Ndr transferpumpens riktning sedan andras suger trans- ferpumpen pa sâ satt luft genom den forsta bransleledningen och brdnsle som forefinns i den forsta brdnsleledningen samt hos forfiltret matas till den andra brdnsletanken. Branslet matas pa sâ satt genom den grovmaskiga silen, vilken damned frigors fran igensattande partiklar. Darmed minskas risken for driftstomingar orsakade av paraffi- nerat brdnsle. The valve is usually controlled to its second height when it has been identified that there is a risk of paraffining of fuel. If the transfer pump direction is different from others, the transfer pump then sucks air through the first fuel line and fuel present in the first fuel line and at the pre-filter is fed to the second fuel tank. The fuel is fed in this way through the coarse-mesh screen, which is then freed from clogging particles. This reduces the risk of operational depletion caused by paraffined fuel.

Altemativt bibehalls ventilens forsta lage ndr det har identifierats att risk for paraffinering av brdnsle foreligger. Ndr transferpumpens riktning sedan andras suger transferpumpen brdnsle fran den forsta brdnsletanken vidare genom forfiltret och matar sedan branslet genom den grovmaskiga silen i den andra brdnsletanken. Lampligen anordnas en brdnslereturledning i anslutning till den forsta brdnsletanken och branslesystemets hogtryckssystem. Trycksatt varmt brdnsle kan pa sâ sad returneras tillbaka till den forsta bransletanken istallet for att transporteras till forbranningsmotorns forbranningsrum. Branslet i den forsta brdnsletanken är saledes varmare an brdnslet i den andra brdnsletanken ndr forbranningsmotorn är i drift. Det varma brdnslet kan damned losa upp eventuellt paraffinerat brdnsle som forefinns hos den forsta bransleledningen, hos forfiltret och i den grovmaskiga silen nar transferpumpens riktning andras. Foretradesvis styrs ventilen darefter till sitt andra ldge, sâ att den forsta bransleledningen och forfiltret toms pa bransle och den forsta bransletanken bibehaller en pa forhand bestamd bransleniva. 8 537 172 Altemativt är den fOrsta brdnsleledningen sa anordnad att den i ena anden mynnar ut i den forsta brdnsletankens ovre del, ovanfor bransleytan. Pa sa satt star den forsta brdnsleledningen i forbindelse med luft som forefinns hos den forsta bransletanken. Ndr det har identifierats att risk for paraffinering av bransle foreligger och transfer- pumpens riktning andras, suger transferpumpen luft fran den forsta brdnsletanken ge- nom den forsta brdnsleledningen och pa sa sift toms den forsta brdnsleledningen och forfiltret pa bransle. Branslet som forefinns i den forsta bransleledningen och forfiltret trycks genom den grovmaskiga silen, vilken pa sa satt frigors fran igensattande partiklar. Darmed minskas risken for driftstorningar orsakade av paraffinerat brdnsle. 10 Foretradesvis andras transferpumpens riktning ndr risk for paraffinering av brdnsle har identifierats och forbranningsmotorn är avstangd. Altemativt andras transfetpumpen riktning ndr risk for paraffinering av brdnsle har identifierats och forbranningsmotom är i drift. Alternatively, the valve's first layer is maintained when it has been identified that there is a risk of paraffining of fuel. Changing the direction of the transfer pump then second, the transfer pump sucks fuel from the first fuel tank further through the pre-filter and then feeds the fuel through the coarse mesh screen in the second fuel tank. A fuel return line is suitably arranged in connection with the first fuel tank and the high-pressure system of the fuel system. Pressurized hot fuel can thus be returned to the first fuel tank instead of being transported to the combustion engine's combustion chamber. The fuel in the first fuel tank is thus hotter than the fuel in the second fuel tank when the internal combustion engine is in operation. The hot fuel can then dissolve any paraffined fuel present in the first fuel line, in the pre-filter and in the coarse-mesh screen when the direction of the transfer pump is different. Preferably, the valve is then controlled to its second level, so that the first fuel line and pre-filter are emptied of fuel and the first fuel tank maintains a predetermined industry level. 8 537 172 Alternatively, the first fuel line is arranged so that in one breath it opens into the upper part of the first fuel tank, above the fuel surface. This is where the first fuel line is connected to the air present at the first fuel tank. When it has been identified that there is a risk of paraffining of fuel and the direction of the transfer pump changes, the transfer pump sucks air from the first fuel tank through the first fuel line and then empties the first fuel line and pre-filter on fuel. The fuel present in the first fuel line and the pre-filter is forced through the coarse-mesh screen, which is then freed from clogging particles. This reduces the risk of operational disruptions caused by paraffined fuel. Preferably, the direction of the transfer pump of others when the risk of paraffining of fuel has been identified and the internal combustion engine is switched off. Alternatively, other people's trans grease pump direction or risk of fuel refining has been identified and the internal combustion engine is in operation.

Lampligen är den forsta brdnsletanken sâ utformad att den rymmer en mindre volym an den andra bransletanken. Denna utformning medger en mindre skrymmande forsta brdnsletank, som är ldttare att anordna hos ett utrymmessnalt chassi. Pa sa sat astadkommes ett icke-skrymmande branslesystem. Vidare innebar en mindre forsta bransle- tank att branslesystemet kan mata bransle till thrbrdnningsmotorn vid en lagre bransle- niva an om samma brdnslevolym hade tillforts den storre andra brdnsletanken. Pa sa satt astadkommes ett brdnslesystem for en forbranningsmotor, som medger en flexibel reglering av bransletillforseln och armed undviks driftstorningar vid lag bransleniva i brdnsletanken. Foretradelsevis rymmer den forsta bransletanken 20-50 liter och den andra brdnsletanken 300-1000 liter. Lamply, the first fuel tank is designed to hold 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 space-specific chassis. In this way, a non-bulky industry system is achieved. Furthermore, a smaller first fuel tank meant that the fuel system could feed fuel to the combustion engine at a lower fuel level than if the same fuel tank volume had been supplied to the larger second fuel tank. In this way, a fuel system for an internal combustion engine is provided, which allows a flexible regulation of the fuel supply and armed avoids operational disruptions at low fuel levels in the fuel tank. Preferably, the first fuel tank holds 20-50 liters and the second fuel tank 300-1000 liters.

Foretrddesvis är huvudmatarpumpen en lagtryckspump, vilken drivs av en andra elektrisk motor. Ldmpligen är awn huvudmatarpumpen omriktningsbar. Pa sà sat astadkommes en mer effektiv och flexibel reglering av bransletillforseln till forbrannings30 motorn. 9 537 172 Lampligen är huvudmatarpumpen anordnad hos den forsta bransletanken. Pa sà sat skyddas huvudmatarpumpen fran omgivningen och far en naturlig kylning av branslet i den forsta bransletanken. Alternativt är alien transferpumpen och forfiltret anordnade inuti den forsta bransletanken. Med huvudmatarpumpen, transferpumpen, forfiltret och ventilen anordnade inuti den forsta bransletanken astadkommes ett icke-skrymmande branslesystem. Preferably, the main feed pump is a low pressure pump, which is driven by a second electric motor. Of course, the main feed pump is adjustable. In this way, a more efficient and flexible regulation of the fuel supply to the combustion engine 30 is achieved. 9 537 172 The main supply pump is arranged at the first fuel tank. In this way, the main feed pump is protected from the environment and receives a natural cooling of the fuel in the first fuel tank. Alternatively, the alien transfer pump and the pre-filter are arranged inside the first fuel tank. With the main feed pump, the transfer pump, the pre-filter and the valve arranged inside the first fuel tank, a non-bulky fuel system is achieved.

Foretradesvis innefattar den forsta bransletanken en nivasensor for att bestdmma branslenivan i den forsta bransletanken. Lampligen är en overstromningsledning anordnad i forbindelse med den forsta bransletanken och den andra bransletanken. Nar den med nivasensorn bestamda branslenivan i den forsta bransletanken overskrider ett forutbestamt nivagransvarde leds bransle fran den forsta bransletanken via overstromningsledningen till den andra bransletanken. Lampligen är overstromningsledningen anordnad i anslutning till den fOrsta bransletankens ovansida samt den andra bransletankens ovansida. Alternativt kan overstromningsledningen vara anordnad i anslutning till den forsta bransletankens botten. Preferably, the first fuel tank includes a level sensor for determining the fuel level in the first fuel tank. Lamply, a flood line is arranged in connection with the first fuel tank and the second fuel tank. When the level of fuel in the first fuel tank determined by the level sensor exceeds a predetermined level equivalent, the branch is led from the first fuel tank via the overflow line to the second fuel tank. Lamply, the flood line is arranged in connection with the upper side of the first fuel tank and the upper side of the second fuel tank. Alternatively, the overflow line may be arranged in connection with the bottom of the first fuel tank.

Lampligen styrs transferpumpen att mata bransle fran den andra bransletanken till den forsta bransletanken nar den med nivasensorn bestamda branslenivan i den forsta bransletanken understiger ett forutbestamt varde. The transfer pump is controlled to feed fuel from the second fuel tank to the first fuel tank when the fuel level determined with the level sensor in the first fuel tank is less than a predetermined value.

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 bifogadc ritningar, pa vilka: Fig. 1visar en schematisk sidovy av ett fordon, som innefattar ett branslesystem for en forbranningsmotor enligt foreliggande uppfinning, 10 537 172 Fig. 2visar ett kopplingsschema fOr ett brdnslesystem enligt en forsta utforings- form av foreliggande uppfinning, Fig. 3visar ett kopplingsschema for ett brdnslesystem enligt en andra utforings- form av foreliggande uppfinning, och Fig. 4a-4b visar flodesscheman Over forfaranden for att minska risken for driftstorningar orsakade av paraffinerat brdnsle i ett brdnslesystem enligt foreliggande uppfinning. 10 DETALJERAD BESKRIVNING AV EN UTFORINGSFORM AV UPPFINNINGEN Fig. 1 visar en schematisk sidovy av ett fordon 1, vilket fordon innefattar ett brdnslesystem 4 for en forbranningsmotor 2 enligt foreliggande uppfinning. Forbranningsmotom 2 är kopplad till en vaxellada 6, som är kopplad till fordonets 1 drivhjul 8 via en transmission. Fordonet innefattar Wen ett chassi 10. 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 an internal combustion engine fuel system according to the present invention; Fig. 3 shows a wiring diagram for a fuel system according to a first embodiment of the present invention, Fig. 3 shows a wiring diagram for a fuel system according to a second embodiment of the present invention, and Figs. 4a-4b show flow diagrams of procedures for reducing the risk of operational disturbances caused by paraffined fuel in a fuel system according to the present invention. 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, which is connected to the drive wheel 8 of the vehicle 1 via a transmission. The vehicle includes a Wen chassis 10.

Fig. 2 visar ett kopplingsschema for ett brdnslesystem 4 fOr en forbranningsmotor 2 enligt foreliggande uppfinning. Brdnslesystemet 4 innefattar flertalet komponenter, varav ett huvudbranslefilter 12, en hogtryckspump 14, en ackumulator i form av en sa kallad common rail 16 samt ett insprutningssystem 18 schematiskt visat i form av en bransleinsprutare, är anordnade hos forbrdnningsmotom 2 (forbranningsmotom 2 visas i fig. 1). Alternativt kan common rail 16 ersattas av en annan form av insprutningssystem 18, exempelvis piezo- eller enhetsinsprutningssystem. flogtryckspumpen 14, common rail 16 och insprutningssystemet 18 utgor komponenter i brdnslesystemets 4 hogtryckssystem 19. Brdnslesystemet 4 innefattar Wen en forsta brdnsletank 20, en andra brdnsletank 22, en tredje brdnsletank 24, en huvudmatarpump 26, en transfer-pump 28 samt ett forfilter 30. Dessa komponenter kan vara anordnade vid fordonets chassi 10 (chassi 10 visas i fig. 1). Huvudbranslefiltret 12 är anordnat nedstroms hu- vudmatarpumpen 26 och uppstroms hogtryckspumpen 14 i brdnslesystemet 4. Vidare innefattar brdnslesystemet 4 en branslereturledning 13, genom vilken trycksatt varmt 11 537 172 bransle returneras fran branslesystemets 4 hogtryckssystem 19 tillbaka till den forsta bransletanken 20. Fig. 2 shows a wiring diagram of a fuel system 4 for an internal combustion engine 2 according to the present invention. The fuel system 4 comprises several components, of which a main fuel filter 12, a high-pressure pump 14, an accumulator in the form of a so-called common rail 16 and an injection system 18 schematically shown in the form of a fuel injector, are arranged at the internal combustion engine 2 (combustion engine 2 is shown in fig. 1). Alternatively, common rail 16 may be replaced by another form of injection system 18, for example piezo or unit injection systems. The flue pressure pump 14, common rail 16 and the injection system 18 form components of the high pressure system 19 of the fuel system 4. The fuel system 4 comprises Wen a first fuel tank 20, a second fuel tank 22, a third fuel tank 24, a main feed pump 26, a transfer pump 28 and a pre-filter 30. These components can be arranged at the chassis 10 of the vehicle (chassis 10 is shown in Fig. 1). The main fuel filter 12 is arranged downstream of the main feed pump 26 and upstream of the high pressure pump 14 in the fuel system 4. Furthermore, the fuel system 4 comprises a fuel return line 13, through which pressurized hot fuel is returned from the fuel system high pressure tank 19 back to the fuel tank 20.

Samtliga tre tankar 20, 22, 24 är i sina respektive ovre delar forbundna med en ventila- tionsledning 50 vilken via ett luftfilter 51 kommunicerar med omgivningen. Ventila- tionsledningen 50 sakerstaller att trycket i respektive tank 20, 22, 24 är och forblir vdsentligen detsamma, och lika med, omgivningens luftryck oberoende av hur mycket bransle som finns i respektive tank. Luftfiltret 51 forhindrar att fororeningar i omgivande luft tranger in i ventilationsledningen 50 i samband med ventilering av tankarna. All three tanks 20, 22, 24 are in their respective upper parts connected to a ventilation line 50 which communicates with the environment via an air filter 51. The ventilation line 50 states that the pressure in each tank 20, 22, 24 is and remains essentially the same, and equal to, the ambient air pressure regardless of how much fuel is present in each tank. The air filter 51 prevents pollutants in the ambient air from penetrating into the ventilation duct 50 in connection with the ventilation of the tanks.

Den forsta bransletanken 20 är sà utformad att den rymmer en mindre volym an den andra bransletanken 22 och den tredje bransletanken 24. Den andra bransletanken 22 och den tredje bransletanken 24 motsvarar huvudbransletankar och rymmer vasentligen samma volym och har ett sjalvreglerade flode mellan varandra genom ett fOrbin- delseror 34 anordnat mellan den nedre delen hos den andra bransletanken 22 och den tredje bransletanken 24. Transferpumpen 28 är omriktningsbar och enligt fig. 2 anordnad mellan den forsta bransletanken 20 och den andra bransletanken 22. Transferpumpen 28 drivs av en forsta elektrisk motor M1 och har som huvuduppgift att mata brans-le fran den andra bransletanken 22 till den forsta bransletanken 20 via en forsta brans- leledning 36. Huvudmatarpumpen 26 drivs av en andra elektrisk motor M2 och är an- ordnad inuti den forsta bransletanken 20 och skyddas pa sa satt fran omgivningen och kyls av branslet. Mellan den forsta bransletanken 20 och den andra bransletanken 22 är en overstromningsledning 38 anordnad, sâ att bransle kan transporteras over fran den forsta bransletanken 20 till den andra bransletanken 22 om den forsta bransletanken blir overfylld. Huvudmatarpumpen 26 har som huvuduppgift att mata branslet frail den forsta bransletanken 20 via en andra bransleledning 40 genom huvudbranslefiltret 12 och vidarc till hogtryckssystemet 19. Med hogt tryck matas sedan branslet till common rail 16 och vidare till insprutningssystemet 18. Huvudmatarpumpen 26 och transferpumpen 28 är styrda av en styrenhet 42 via en CAN-buss 44. The first fuel tank 20 is designed to hold a smaller volume than the second fuel tank 22 and the third fuel tank 24. The second fuel tank 22 and the third fuel tank 24 correspond to main fuel tanks and hold substantially the same volume and have a self-regulating flow between each other through a connection. sub-rows 34 arranged between the lower part of the second fuel tank 22 and the third fuel tank 24. The transfer pump 28 is adjustable and according to Fig. 2 arranged between the first fuel tank 20 and the second fuel tank 22. The transfer pump 28 is driven by a first electric motor M1 and has as its main task to feed fuel from the second fuel tank 22 to the first fuel tank 20 via a first fuel line 36. The main feed pump 26 is driven by a second electric motor M2 and is arranged inside the first fuel tank 20 and is thus protected. from the environment and cooled by the industry. 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 becomes overfilled. The main task of the main feed pump 26 is to feed the fuel from the first fuel tank 20 via a second fuel line 40 through the main fuel filter 12 and further to the high pressure system 19. With high pressure the fuel is then fed to the common rail 16 and further to the injection system 18. The main feed pump 26 and the transfer pump 28 are controlled. of a control unit 42 via a CAN bus 44.

Forfiltret 30 är anordnat nedstroms transferpumpen 28 och är foretradelsevis ett finmaskigt, vattenavskiljande filter. Vid den ena anden av den forsta bransleledningen 36, 12 537 172 beldgen hos den andra brdnsletanken 22, är en grovmaskig sil 52 anordnad. Den grovmaskiga silen 52 är saledes anordnad uppstroms transferpumpen 28, vilket medfor att transferpumpen 28 suger bransle igenom den grovmaskiga silen 52. Den grovmaskiga silen 52 filtrerar bort partiklar over en forutbestamd storlek. Transferpumpen 28 tryck- sat-ter darefter branslet och matar det igenom forfiltret 30, via den forsta brdnsleled- ningen 36, vidare till den forsta brdnsletanken 20. Branslet i den forsta brdnsletanken 20 har pa sâ satt passerat bade en grovmaskig sil 52 och ett finmaskigt forfilter 30, vilket medfor att huvudmatarpumpen 26, som är anordnad i den forsta brdnsletanken 20 är skyddad mot fororeningar. Genom att anordna forfiltret 30 nedstroms transfer- 1 0pumpen 28 trycks brdnslet igenom forfiltret 30, vilket medger att branslet ldttare passe- rar forfiltret 30 och forfiltret 30 loper pa sa satt mindre risk att igensattas. The pre-filter 30 is arranged downstream of the transfer pump 28 and is preferably a fine-mesh, water-separating filter. At one end of the first fuel line 36, 12 537 172 the bellows of the second fuel tank 22, a coarse mesh screen 52 is provided. The coarse mesh screen 52 is thus arranged upstream of the transfer pump 28, which causes the transfer pump 28 to suck fuel through the coarse mesh screen 52. The coarse mesh screen 52 filters out particles over a predetermined size. The transfer pump 28 then pressurizes the fuel and feeds it through the pre-filter 30, via the first fuel line 36, on to the first fuel tank 20. The fuel in the first fuel tank 20 has thus passed both a coarse mesh screen 52 and a fine mesh pre-filter 30, which means that the main feed pump 26, which is arranged in the first fuel tank 20, is protected against contamination. By arranging the pre-filter 30 downstream of the transfer pump 28, the fuel is pushed through the pre-filter 30, which allows the industry to pass the pre-filter 30 more easily and the pre-filter 30 runs in such a less risk of clogging.

I den forsta bransletanken 20 är en forsta nivasensor 46 anordnad for att identifiera branslenivan i den forsta bransletanken 20. Mir den med nivasensom 46 bestamda branslenivan i den forsta bransletanken 20 understiger ett forutbestamt nivagransvarde styrs transferpumpen 28 att mata bransle frail den andra brdnsletanken 22 till den forsta bransletanken 20. En andra nivasensor 48 är anordnad i den andra brdnsletanken 22 for att identifiera branslenivan i den andra bransletanken 22. Den forsta nivasensorn 46 och den andra nivasensorn 48 är anslutna till CAN-bussen 44 och styrenheten 42, som styr transferpumpen 28 och huvudmatarpumpen 26. In the first fuel tank 20, a first level sensor 46 is arranged to identify the fuel level in the first fuel tank 20. When the fuel level determined by the level sensor 46 in the first fuel tank 20 is below a predetermined level, the transfer pump 28 is controlled to supply fuel from the second fuel tank 22 to the first fuel tank 20. A second level sensor 48 is provided in the second fuel tank 22 to identify the fuel level in the second fuel tank 22. The first level sensor 46 and the second level sensor 48 are connected to the CAN bus 44 and the control unit 42, which control the transfer pump 28 and main feed pump 26.

Vidare är en forsta temperaturgivare 60 ansluten till styrenheten 42. Den forsta temperaturgivaren 60 forser styrenheten 42 med utomhustemperatur hos omgivningen i vilken fordonet 1 (visad i Fig. 1) befinner sig. En lag utomhustemperatur kan indikera att risk for paraffinering av brdnsle foreligger. Furthermore, a first temperature sensor 60 is connected to the control unit 42. The first temperature sensor 60 provides the control unit 42 with outdoor temperature of the environment in which the vehicle 1 (shown in Fig. 1) is located. A low outdoor temperature may indicate that there is a risk of paraffin refueling.

En andra temperaturgivare 62 är likasa ansluten till styrenheten 42 for att forse styrenheten 42 med temperaturen hos forbranningsmotorn 2 (visad i Fig. 1). En lag temperatur hos forbranningsmotorn 2 kan indikera att risk for paraffinering av brdnsle forelig- ger. 13 537 172 En ventil 70 är anordnad nedstrOms fOrfiltret 30 i anslutning till den fOrsta bransleledningen 36. Ventilen 70 är normalt styrd till ett forsta lage, vilket medfor aft den forsta bransleledningen 36 star i forbindelse med den forsta bransletanken 20. 1 ventilens 70 andra lage star den forsta bransleledningen 36 i forbindelse med branslesystemet om- givande luft via ett luftfilter 71. Luftfiltret 71 forhindrar att fororeningar i omgivande luft tranger in i den fOrsta bransleledningen 36 i samband med styrning av ventilen 70 till dess andra lage. Ventilen är ansluten till styrenheten 42 via CAN-bussen 44. A second temperature sensor 62 is similarly connected to the control unit 42 to supply the control unit 42 with the temperature of the internal combustion engine 2 (shown in Fig. 1). A low temperature of the internal combustion engine 2 may indicate that there is a risk of paraffin refueling. 13 537 172 A valve 70 is arranged downstream of the pre-filter 30 in connection with the first fuel line 36. The valve 70 is normally controlled to a first layer, which means that the first fuel line 36 is connected to the first fuel tank 20. In the second layer of the valve 70 the first fuel line 36 in connection with the fuel system surrounds air via an air filter 71. The air filter 71 prevents pollutants in the ambient air from penetrating into the first fuel line 36 in connection with controlling the valve 70 to its second layer. The valve is connected to the control unit 42 via the CAN bus 44.

En till styrenheten 42 ansluten flodesmatare 72 är anordnad hos den fOrsta bransleled- ningen, uppstroms transferpumpen 28, for att faststalla forhallandet mellan transfer- pumpens 28 arbete och bransleflodet i den forsta bransleledningen 36. Med hjalp av styrenheten 42 kan stromforbrukningen hos den transferpumpen 28 drivande elmotom M1 bestammas. Altemativt bestams, med hjalp av styrenheten 42, effektuttaget hos den transferpumpen 28 drivande elmotom Ml. Stromforbrukningen och/eller effektut- taget indikerar hur hart transferpumpen 26 arbetar. En viss stromforbrukning eller ett visst effektuttag motsvarar ett visst bransleflode i den fOrsta bransleledningen 36. Skulle styrenheten 42 identifiera en okad stromforbrukning, eller ett 'Rat effektuttag, samtidigt som flodesmataren 72 identifierar ett vasentligen oforandrat bransleflOde, alternativt ett minskat bransleflode, indikeras att forfiltret 30 och/eller den grovmaskiga silen 52 är igensatt. Igensattning kan orsakas av paraffinerat bransle och damned kan information om forhallandet mellan transferpumpens 28 arbete och bransleflodet i den fOrsta bransleledningen 36 anvandas for att identifiera om risk for paraffinering av bransle foreligger. A flow feeder 72 connected to the control unit 42 is provided at the first fuel line, upstream of the transfer pump 28, to determine the relationship between the operation of the transfer pump 28 and the fuel flow in the first fuel line 36. Using the control unit 42, the power consumption of the transfer pump 28 can be driven. electric motor M1 is determined. Alternatively, with the aid of the control unit 42, the power output of the electric motor M1 driving the transfer pump 28 is determined. The power consumption and / or the power outlet indicate how hard the transfer pump 26 works. A certain power consumption or a certain power outlet corresponds to a certain fuel flow in the first fuel line 36. Should the control unit 42 identify an increased power consumption, or a 'Rat power outlet, at the same time as the river feeder 72 identifies a substantially unchanged fuel flow, alternatively a reduced fuel flow is indicated. and / or the coarse mesh screen 52 is clogged. Clogging can be caused by paraffined fuel and damned, information about the relationship between the work of the transfer pump 28 and the fuel flow in the first fuel line 36 can be used to identify whether there is a risk of paraffining of fuel.

En fOrsta tryckgivare 74 är anordnad uppstroms forfiltret 30 och en andra tryckgivare 76 är anordnad nedstroms forfiltret 30. Genom att mita trycket hos bransleflodet fore och efter forfiltrct 30 kan skillnadcn i tryck, dct sâ kalladc tryckfallct over forfiltret 30, beraknas. Eft Mgt tryckfall innebar att trycket hos bransleflodet efter forfiltret 30 är betydligt lagre an trycket fore forfiltret 30. Ett sadant hogt tryckfall kan indikera att forfiltret 30 är igensatt och armed forsvarar genomforseln av bransle genom forfiltret 30. Igensattning kan orsakas av paraffinerat bransle och darned kan information om tryckfall anvandas for att identifiera om risk for paraffinering av bransle foreligger. 14 537 172 Den fOrsta och den andra tryckgivaren 74, 76 är anslutna till styrenheten 42 via CANbussen 44. A first pressure sensor 74 is arranged upstream of the pre-filter 30 and a second pressure sensor 76 is arranged downstream of the pre-filter 30. By measuring the pressure of the fuel flow before and after the pre-filter 30, the difference in pressure, so-called pressure drop across the pre-filter 30, can be calculated. Eft Mgt pressure drop meant that the pressure of the fuel flow after the pre-filter 30 is significantly lower than the pressure before the pre-filter 30. Such a high pressure drop can indicate that the pre-filter 30 is clogged and armed defends the passage of fuel through the pre-filter 30. Clogging can be caused by paraffined fuel. information on pressure drops is used to identify whether there is a risk of paraffining of the industry. 14 537 172 The first and second pressure sensors 74, 76 are connected to the control unit 42 via the CAN bus 44.

Transferpumpen 28 är omriktningsbar genom att dess elmotor M1 kan andra rotations- riktning. Transferpumpen 28 styrs via styrenheten 42 att andra riktning dâ risk for paraffinering av bransle har identifierats. Ventilen 70 styrs till sitt andra lage och nar transferpumpens 28 riktning andras sugs pa sâ satt luft via luftfiltret 71 genom den fOrsta bransleledningen 36. Darmed toms forfiltret 30 och den fOrsta bransleledningen 36 pd bransle, vilket leds till den andra bransletanken 22. Branslet fran den forsta bransleledningen 36 och forfiltret 30 trycks med transferpumpen 28 genom den grov- maskiga silen 52 hos den andra bransletanken 22, vilket avldgsnar eventuella igensattande partiklar. Pd sâ satt minskas risken for att paraffinerat bransle orsakar stopp i den fOrsta bransleledningen 36 eller orsakar igensattning av forfiltret 30 och/eller den grovmaskiga silen 52. Altemativt bibehalls ventilens 70 fOrsta ursprungliga lage, sâ att bransle sugs fran den fOrsta bransletanken 20 genom den fOrsta bransleledningen 36 och forfiltret 30 och trycks genom den grovmaskiga silen 52 ndr transferpumpens 28 riktning andras. Det varma branslet i den fOrsta bransletanken 20 kan darmed losa upp eventuellt paraffinerat bransle som forefinns i den fOrsta bransleledningen 36, forfiltret 30 och i den grovmaskiga silen 52 nar transferpumpens 28 riktning andras. Ventilen 70 styrs darefter till sitt andra Idge, sà att den fOrsta bransleledningen 36 och fOrfiltret toms pd bransle samtidigt som en pd forhand bestamd branslenivd bibehalls hos den fOrsta bransletanken 20. The transfer pump 28 is adjustable in that its electric motor M1 can have a different direction of rotation. The transfer pump 28 is controlled via the control unit 42 in the other direction when the risk of paraffining of the fuel has been identified. The valve 70 is directed to its second position and when the direction of the transfer pump 28 is sucked, air is then sucked through the air filter 71 through the first fuel line 36. Thus the pre-filter 30 and the first fuel line 36 are emptied into the fuel, which is led to the second fuel tank 22. the first fuel line 36 and the pre-filter 30 are pushed with the transfer pump 28 through the coarse-mesh screen 52 of the second fuel tank 22, which removes any clogging particles. In this way, the risk of paraffined fuel causing a blockage in the first fuel line 36 or causing clogging of the pre-filter 30 and / or the coarse-mesh screen 52 is reduced. Alternatively, the first original layer of the valve 70 is retained, so that fuel is sucked from the first fuel tank 20 through the first fuel tank. the fuel line 36 and the pre-filter 30 and is pushed through the coarse mesh screen 52 in the direction of the transfer pump 28. The hot fuel in the first fuel tank 20 can thus dissolve any paraffined fuel present in the first fuel line 36, the pre-filter 30 and in the coarse mesh screen 52 when the direction of the transfer pump 28 is different. The valve 70 is then controlled to its second Idge, so that the first fuel line 36 and the pre-filter are emptied of fuel while a predetermined fuel level is maintained at the first fuel tank 20.

Dd olika sammansattningar av brdnsle (diesel eller biodiesel) paraffineras vid olika temperaturer är det svart att avgora om risk for paraffinering foreligger enbart genom att mata utomhustemperaturen. Genom att kombinera information om utomhustemperatur och/eller forbranningsmotoms 2 temperatur mcd information om igensattningsgraden hos forfiltret 30 och/eller den grovmaskiga silen 52, astadkommes ett battre underlag for att avgora om risk for paraffinering foreligger. Information om forfiltrets 30 igensattningsgrad erhalles genom avlasning av den fOrsta och den andra tryckgiva- ren 74, 76 rah/eller genom bestamning av forhdllandet mellan transferpumpens 28 arbete och bransleflodet i den fOrsta bransleledningen 36, enligt beskrivning ovan. Den 537 172 grovmaskiga silens 52 igensattningsgrad erhalles genom bestamning av fOrhallandet mellan transferpumpens 28 arbete och bransleflodet i den fOrsta bransleledningen 36, enligt beskrivning ovan. Styrenheten 42 avgor om risk for paraffinering foreligger och styr transferpumpen 28 darefter. As different compositions of fuel (diesel or biodiesel) are paraffined at different temperatures, it is black to determine whether there is a risk of paraffining just by feeding the outdoor temperature. By combining information on outdoor temperature and / or the temperature of the combustion engine 2 with information on the degree of clogging of the pre-filter 30 and / or the coarse-mesh screen 52, a better basis is provided for determining whether there is a risk of paraffining. Information on the degree of clogging of the pre-filter 30 is obtained by unloading the first and second pressure sensors 74, 76 rah / or by determining the ratio between the operation of the transfer pump 28 and the fuel flow in the first fuel line 36, as described above. The degree of clogging of the 537,172 coarse mesh screen 52 is obtained by determining the ratio between the operation of the transfer pump 28 and the fuel flow in the first fuel line 36, as described above. The control unit 42 determines if there is a risk of paraffining and controls the transfer pump 28 thereafter.

Fig. 3 visar ett kopplingsschema for ett branslesystem 4 for en forbranningsmotor 2 enligt en andra utforingsform av foreliggande uppfinning Branslesystemet 4 är identiskt med branslesystemet 4 beskrivet i Fig. 2 forutom att ventilen 70 och luftfiltret 71 saknas samt att den fOrsta bransleledningen 36 är sâ anordnad att den i ena anden myn- nar ut i den fOrsta bransletankens 20 ovre del. Pa sa satt star den fOrsta bransleledning- en 36 i forbindelse med luft som forefinns hos den fOrsta bransletanken 20. Transferpumpen 28 styrs via styrenheten 42 att Andra riktning dâ risk for paraffinering av bransle har identifierats. Nar transferpumpens 28 riktning Andras sugs pa. sa. satt luft fran den fOrsta bransletanken 20 genom den fOrsta bransleledningen 36. Darmed toms forfiltret 30 och den forsta bransleledningen 36 pa bransle, vilket leds till den andra bransletanken 22. Branslet fran den fOrsta bransleledningen 36 och fOrfiltret 30 trycks med transferpumpen 28 genom den grovmaskiga silen 52 hos den andra bransletanken 22, vilket rensar den grovmaskiga silen 52 pa eventuella igensattande partiklar. PA sa. satt minskas risken for att paraffinerat bransle orsakar stopp i den fOrsta bransleled- ningen 36 eller orsakar igensattning av forfiltret 30 och den grovmaskiga silen 52. Fig. 3 shows a circuit diagram of a fuel system 4 for an internal combustion engine 2 according to a second embodiment of the present invention. The fuel system 4 is identical to the fuel system 4 described in Fig. 2 except that the valve 70 and the air filter 71 are missing and the first fuel line 36 is so arranged that in one spirit it empties into the upper part of the first fuel tank 20. In this way, the first fuel line 36 is connected to air present in the first fuel tank 20. The transfer pump 28 is controlled via the control unit 42 so that the second direction when the risk of paraffining of the fuel has been identified. When the transfer pump's 28 direction Andras is sucked on. sa. air from the first fuel tank 20 through the first fuel line 36. Thus, the pre-filter 30 and the first fuel line 36 are emptied of fuel, which is led to the second fuel tank 22. The fuel from the first fuel line 36 and the pre-filter 30 are pushed with the transfer pump 28 through the coarse mesh screen. 52 of the second fuel tank 22, which cleans the coarse mesh screen 52 of any clogging particles. PA sa. This reduces the risk that paraffined fuel will cause a blockage in the first fuel line 36 or cause clogging of the pre-filter 30 and the coarse-mesh screen 52.

Fig. 4a visar ett flodesschema Over ett forfarande for att minska risken for driftstorningar orsakade av paraffinerat bransle i branslesystemet 4 enligt ett utforande av foreliggande uppfinning. Branslesystemet 4 innefattar en fOrsta bransletank 20, en andra bransletank 22, en fOrsta bransleledning 36 anordnad i forbindelse med den fOrsta bransletanken 20 och den andra bransletanken 22, en andra bransleledning 40 anordnad i forbindelse mcd den fOrsta bransletanken 20, en huvudmatarpump 26 anordnad att mata bransle fran den fOrsta bransletanken 20 genom den andra bransleledningen 40 till ett hogtryckssystem 19, en trans ferpump 28 anordnad att mata bransle frail den andra bransletanken 22 till den fOrsta bransletanken 20 via den forsta bransleledningen 36 samt ett forfilter 30 anordnat nedstroms transferpumpen 28. F6rfarandet enligt uppfinningen innefattar steget S101 att besluta om risk for paraffinering av bransle fore- 16 537 172 ligger. Vidare innefattar fOrfarandet steget S102 att vid risk fOr paraffinerig andra transferpumpens 28 riktning, sâ att flodesriktningen genom ett forfiltret 30 och den forsta bransleledningen 36 vands. Transferpumpens 28 riktning andras genom att andra rotationsriktningen hos en transferpumpen 28 drivande elmotor Ml. Fig. 4a shows a flow chart of a method for reducing the risk of operational disturbances caused by paraffined fuel in the fuel system 4 according to an embodiment of the present invention. The fuel system 4 comprises a first fuel tank 20, a second fuel tank 22, a first fuel line 36 arranged in connection with the first fuel tank 20 and the second fuel tank 22, a second fuel line 40 arranged in connection with the first fuel tank 20, a main feed pump 26 arranged to feed fuel from the first fuel tank 20 through the second fuel line 40 to a high pressure system 19, a transfer pump 28 arranged to supply fuel from the second fuel tank 22 to the first fuel tank 20 via the first fuel line 36 and a pre-filter 30 arranged downstream of the transfer pump 28. the invention comprises the step S101 of deciding whether there is a risk of paraffining of the industry. Furthermore, the method comprises step S102 that at risk of paraffining the direction of the second transfer pump 28, so that the flow direction through a pre-filter 30 and the first branch line 36 is reversed. The direction of the transfer pump 28 is changed by the second direction of rotation of an electric motor M1 driving a transfer pump 28.

Fig. 4b visar ett flodesschema Over ett forfarande for att minska risken for driftstorningar orsakade av paraffinerat bransle i branslesystemet 4 enligt ett annat utforande av foreliggande uppfinning. Branslesystemet 4 innefattar en forsta bransletank 20, en andra bransletank 22, en forsta bransleledning 36 anordnad i forbindelse med den for- sta bransletanken 20 och den andra bransletanken 22, en andra bransleledning 40 an- ordnad i forbindelse med den forsta bransletanken 20, en huvudmatarpump 26 anordnad att mata bransle fran den forsta bransletanken 20 genom den andra bransleledningen 40 till ett hogtryckssystem 19, en transferpump 28 anordnad att mata bransle fran den andra bransletanken 22 till den forsta bransletanken 20 via den forsta briinsleled- ningen 36 samt ett forfilter 30 anordnat nedstroms transferpumpen 28. Forfarandet innefattar steget S201 att identifiera utomhustemperaturen hos omgivningen i vilken fordonet 1 (visat i Fig. 1) befinner sig, genom att avlasa en forsta temperaturgivare 60 ansluten till en styrenhet 42. Vidare i steg S202 identifieras tryckfallet Over forfiltret 30, genom att avlasa en forsta och en andra tryckgivare 74, 76 anordnade pa bagge sidor om forfiltret 30. Den forsta och den andra tryckgivaren 74, 76 är anslutna till styrenheten 42. Genom att identifiera tryckfallet Over forfiltret 30 ges en indikation pa om forfiltret 30 är igensatt. Igensattning kan orsakas av paraffinerat bransle. Forfarandet innefattar vidare steget S203 att besluta om risk for paraffinering av bransle foreligger, utifran de identifierade vardena pa utomhustemperatur och tryckfall. Om tryck- fallet indikerar att forfiltret 30 är igensatt samtidigt som utomhustemperaturen under- stiger ett temperaturgransvarde, anses risk for paraffinering foreligga och transferpumpen 28 styrs i steg S204 av styrenheten 42 att andra riktning. Transferpumpens 28 riktning andras genom att andra rotationsriktningen hos en transferpumpen 28 drivande elmotor Ml. Pa sâ salt matas bransle, som forefinns hos forfiltret 30 samt hos den for- sta bransleledningen 36, med transferpumpen 28 till den andra bransletanken 22. Fig. 4b shows a flow chart of a method for reducing the risk of operational disturbances caused by paraffined fuel in the fuel system 4 according to another embodiment of the present invention. The fuel system 4 comprises a first fuel tank 20, a second fuel tank 22, a first fuel line 36 arranged in connection with the first fuel tank 20 and the second fuel tank 22, a second fuel line 40 arranged in connection with the first fuel tank 20, a main feed pump 26 arranged to supply fuel from the first fuel tank 20 through the second fuel line 40 to a high pressure system 19, a transfer pump 28 arranged to feed fuel from the second fuel tank 22 to the first fuel tank 20 via the first fuel line 36 and a pre-filter 30 arranged downstream the transfer pump 28. The method comprises the step S201 of identifying the outdoor temperature of the environment in which the vehicle 1 (shown in Fig. 1) is located, by reading a first temperature sensor 60 connected to a control unit 42. Further, in step S202, the pressure drop across the pre-filter 30 is identified by to unload a first and a second pressure sensor 74, 76 arranged on rear sides o The first and second pressure sensors 74, 76 are connected to the control unit 42. By identifying the pressure drop across the pre-filter 30, an indication is given as to whether the pre-filter 30 is clogged. Clogging can be caused by paraffined fuel. The procedure further comprises step S203 in deciding whether there is a risk of paraffining of the fuel, based on the identified values of outdoor temperature and pressure drop. If the pressure drop indicates that the pre-filter 30 is clogged at the same time as the outdoor temperature falls below a temperature range value, there is a risk of paraffining and the transfer pump 28 is controlled in step S204 by the control unit 42 in the other direction. The direction of the transfer pump 28 is changed by the second direction of rotation of an electric motor M1 driving a transfer pump 28. On such salt, fuel, which is present at the pre-filter 30 and at the first fuel line 36, is fed with the transfer pump 28 to the second fuel tank 22.

Branslet som matas tillbaka till den andra bransletanken 22 trycks med transferpumpen 28 genom en vid den ena anden av den forsta bransleledningen 36, belagen hos den 17 537 172 andra bransletanken 22, anordnad grovmaskig sil 52. Pa sa salt avldgsnas eventuella igensattande partiklar, sa som paraffinerat brdnsle, fran den grovmaskiga silen 52. The fuel fed back to the second fuel tank 22 is pushed with the transfer pump 28 through a coarse-mesh screen 52 arranged at one end of the first fuel line 36, located at the second fuel tank 22, on which salt any clogging particles are deposited, such as paraffined fuel, from the coarse mesh screen 52.

Altemativt innefattar steget S201 att identifiera temperaturen hos forbrdnningsmotom 2 istallet for utomhustemperaturen. Forbranningsmotorns 2 temperatur erhalles lämpli- gen genom avlasning av en andra temperaturgivare 62 ansluten till styrenheten 42. Alternatively, step S201 comprises identifying the temperature of the internal combustion engine 2 instead of the outdoor temperature. The temperature of the internal combustion engine 2 is conveniently obtained by unloading a second temperature sensor 62 connected to the control unit 42.

Altemativt innefattar steget S201 att identifiera utomhustemperaturen med temperaturgivaren 60 samt att identifiera forbrdnningsmotoms 2 temperatur med temperaturgiva- 1 0ren 62. Bade utomhustemperaturen och forbranningsmotorns 2 temperatur bar under- stiga dess respektive temperaturgransvarden for att beslut ska tas om att risk for paraffinering av bransle foreligger. Alternatively, step S201 includes identifying the outdoor temperature with the temperature sensor 60 and identifying the temperature of the combustion engine 2 with the temperature sensor 62. Both the outdoor temperature and the temperature of the internal combustion engine 2 should be below their respective temperature thresholds to decide whether there is a risk of paraffining of fuel.

Altemativt innefattar steget S202 att identifiera fOrhallandet mellan transferpumpens 28 arbete och bransleflodet hos den forsta brdnsleledningen 36. Detta astadkommes genom en till styrenheten 42 ansluten flOdesmatare 72 samt genom styrenheten 42 bestamda varden pa stromforbrukning och/eller effektuttag hos den transferpumpen 28 drivande elmotom Ml. Genom att bestamma elmotoms M1 strOmfOrbrukning/effektuttag samt bransleflodet i den forsta brdnsleledningen 36 kan indikation erhallas om igensatning av forfiltret 30 och/eller den grovmaskiga silen 52. Alternatively, step S202 comprises identifying the relationship between the operation of the transfer pump 28 and the fuel flow of the first fuel line 36. This is accomplished by a flow feeder 72 connected to the control unit 42 and by the control unit 42 the value of power consumption and / or power output of the transfer pump 28 driving electric motor. By determining the power consumption / power outlet of the electric motor M1 and the fuel flow in the first fuel line 36, an indication can be obtained of clogging of the pre-filter 30 and / or the coarse mesh screen 52.

Altemativt innefattar steget S204 att, i samband med att transferpumpens 28 riktning andras, styra en nedstroms forfiltret 30 anordnad ventil 70 till ett andra ldge, sâ att den forsta bransleledningen 36 star i forbindelse med brdnslesystemet 4 omgivande luft. Pa sa satt suger transferpumpen 28 luft genom den forsta bransleledningen 36 ndr trans- ferpumpens 28 riktning andras och brdnsle, som forefinns i den forsta brdnsleledningen 36 och hos forfiltret 28, matas till den andra bransletanken 22 och gcnom den grovmaskiga silen 52. Alternatively, step S204 comprises, in connection with the direction of the transfer pump 28 changing, directing a valve 70 arranged downstream of the pre-filter 30 to a second location, so that the first fuel line 36 is in communication with the fuel system 4 surrounding air. In this way, the transfer pump 28 draws air through the first fuel line 36 in the direction of the transfer pump 28 and fuel present in the first fuel line 36 and at the pre-filter 28 is fed to the second fuel tank 22 and through the coarse mesh screen 52.

Temperaturgivarna 60, 62 kan avldsas bade under drift och da forbrdnningsmotom 2 är avstangd. Tryckgivarna 74, 76, flodesmdtaren 72 samt stromforbrukning/effektuttag avldses lampligen under drift. 18 537 172 Angivna komponenter och sardrag som anges ovan kan inom ramen for uppfinningen kombineras mellan olika angivna utfOranden. 19 The temperature sensors 60, 62 can be turned off both during operation and when the combustion engine 2 is switched off. The pressure sensors 74, 76, the flow meter 72 and the power consumption / power outlet are illuminated during operation. The stated components and features stated above can be combined within the scope of the invention between different specified embodiments. 19

Claims (18)

537 172 Patentkrav537,172 Claims 1. Brdnslesystem for en forbranningsmotor (2), vilket branslesystem (4) innefattar en forsta bransletank (20) , en andra brdnsletank (22), en forsta brdnsleledning (36) an- ordnad i forbindelse med den forsta bransletanken (20) och den andra brdnsletanken (22) , en andra brdnsleledning (40) anordnad i forbindelse med den forsta bransletanken (20), en huvudmatarpump (26) anordnad att mata brdnsle fran den forsta bransletanken (20) genom den andra bransleledningen (40) till ett hogtryckssystem (19) samt en transferpump (28) anordnad att mata bransle fran den andra bransletanken (22) till den forsta brdnsletanken (20) via den forsta bransleledningen (36), kannetecknat av att ett forfilter (30) är anordnat nedstroms transferpumpen (28) samt att en forsta elektrisk motor (M1) är anordnad att driva transferpumpen (28), van i transferpumpen (28) är omriktningsbar, sA att flodesriktningen genom forfiltret (30) och den forsta bransleledningen (36) kan vandas nar risk fOr paraffinering av brdnsle har identifierats.A fuel system 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 (36) arranged in connection with the first fuel tank (20) and the the second fuel tank (22), a second fuel line (40) arranged in connection with the first fuel tank (20), a main feed pump (26) arranged to supply fuel from the first fuel tank (20) through the second fuel line (40) to a high pressure system ( 19) and a transfer pump (28) arranged to supply fuel from the second fuel tank (22) to the first fuel tank (20) via the first fuel line (36), characterized in that a pre-filter (30) is arranged downstream of the transfer pump (28) and that a first electric motor (M1) is arranged to drive the transfer pump (28), the van in the transfer pump (28) is divertable, so that the flow direction through the pre-filter (30) and the first fuel line (36) can be watered when there is a risk of paraffin burning. e has been identified. 2. Branslesystem enligt krav 1, kannetecknat av att transferpumpen (28) är omriktningsbar genom att rotationsriktningen hos dess elektriska motor (M1) andras.Fuel system according to claim 1, characterized in that the transfer pump (28) is reversible by changing the direction of rotation of its electric motor (M1). 3. Branslesystem enligt nagot av foregaende krav, lannetecknat av att transferpum- pen (28) är ansluten till en styrenhet (42).Fuel system according to one of the preceding claims, characterized in that the transfer pump (28) is connected to a control unit (42). 4. Branslesystem enligt nagot av foregaende krav, kannetecknat av att brdnslesystemet (4) innefattar en forsta och en andra temperaturgivare (60, 62), for bestamning av utomhustemperatur respektive temperatur hos forbranningsmotorn (2).Fuel system according to one of the preceding claims, characterized in that the fuel system (4) comprises a first and a second temperature sensor (60, 62), for determining the outdoor temperature and the temperature of the internal combustion engine (2), respectively. 5. Branslesystem enligt nagot av foregaende krav, kannetecknat av att en grovmaskig sil (52) är anordnad hos den forsta brdnsleledningen (36), uppstroms transferpumpen (28).Fuel system according to one of the preceding claims, characterized in that a coarse-mesh screen (52) is arranged on the first fuel line (36), upstream of the transfer pump (28). 6. Branslesystem enligt nagot av foregaende krav, kannetecknat av att en flodesmdta- re (72) är anordnad hos den forsta brdnsleledningen (36). 537 172Fuel system according to one of the preceding claims, characterized in that a river collector (72) is arranged on the first fuel line (36). 537 172 7. Branslesystem enligt nagot av foregaende krav, kannetecknat av att en forsta och en andra tryckgivare (74, 76) är anordnade pa varsin sida om forfiltret (30).A fuel system according to any one of the preceding claims, characterized in that a first and a second pressure sensor (74, 76) are arranged on each side of the pre-filter (30). 8. Branslesystem enligt nagot av foregaende krav, kannetecknat av att en ventil (70) är anordnad hos den forsta bransleledningen (36) nedstroms forfiltret (30), van i venti- len (70) i ett forsta lage medfor att den forsta bransleledningen (36) star i forbindelse med den forsta bransletanken (20) och i ett andra lage medfor att den forsta bransleledningen (36) star i forbindelse med branslesystemet omgivande luft.Fuel system according to any one of the preceding claims, characterized in that a valve (70) is arranged at the first fuel line (36) downstream of the pre-filter (30), used in the valve (70) in a first layer so that the first fuel line ( 36) is connected to the first fuel tank (20) and in a second layer means that the first fuel line (36) is connected to the ambient air surrounding the fuel system. 9. Branslesystem enligt nagot av kraven 1-7, kannetecknat av att den forsta bransle- ledningen (36) är sâ anordnad att den i ena anden mynnar ut hos den forsta bransletankens (20) ovre del, sâ att den forsta bransleledningen (36) star i forbindelse med luft som forefinns hos den forsta bransletanken (20).Fuel system according to any one of claims 1-7, characterized in that the first fuel line (36) is arranged so that it opens in one breath at the upper part of the first fuel tank (20), so that the first fuel line (36) stands in connection with air present at the first fuel tank (20). 10. Branslesystem enligt nagot av foregaende krav, kannetecknat av att den forsta bransletanken (20) är sâ utformad att den rymmer en mindre volym an den andra bransletanken (22).Fuel system according to one of the preceding claims, characterized in that the first fuel tank (20) is designed to accommodate a smaller volume than the second fuel tank (22). 11. Forbranningsmotor (2) kannetecknad av att den innefattar ett branslesystem (4) enligt nagot av kraven 1-10.Internal combustion engine (2) characterized in that it comprises a fuel system (4) according to any one of claims 1-10. 12. Fordon (1) kannetecknat av att det innefattar ett branslesystem (4) enligt nagot av kraven 1-10.Vehicle (1) characterized in that it comprises a fuel system (4) according to any one of claims 1-10. 13. Forfarande for att minska risken for driftstorningar orsakade av paraffinerat bransle i ett branslesystem (4) for en forbranningsmotor (2), vilket branslesystem (4) innefattar en forsta bransletank (20) , en andra bransletank (22), en forsta branslcledning (36) anordnad i forbindelse med den forsta bransletanken (20) och den andra bransletanken (22) , en andra bransleledning (40) anordnad i forbindelse med den forsta bransletan- ken (20), en huvudmatarpump (26) anordnad att mata bransle fran den forsta bransle- tanken (20) genom den andra bransleledningen (40) till ett hogtryckssystem (19) samt 21 537 172 en transferpump (28) anordnad att mata bransle fran den andra bransletanken (22) till den forsta bransletanken (20) via den forsta bransleledningen (36), kannetecknat av stegen att: 1. besluta om risk for paraffinering av bransle fcireligger, - andra transferpumpens (28) riktning vid risk for paraffinering, sâ att flodesrikt- ningen genom den forsta bransleledningen (36) och ett nedstroms transferpumpen (28) anordnat forfilter (30) vands.A method for reducing the risk of operational disturbances caused by paraffined fuel 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 ( 36) arranged in connection with the first fuel tank (20) and the second fuel tank (22), a second fuel line (40) arranged in connection with the first fuel tank (20), a main feed pump (26) arranged to feed fuel from the the first fuel tank (20) through the second fuel line (40) to a high pressure system (19) and 21 537 172 a transfer pump (28) arranged to supply fuel from the second fuel tank (22) to the first fuel tank (20) via the first the branch line (36), characterized by the steps of: 1. deciding whether there is a risk of paraffining of the branch, - the direction of the second transfer pump (28) at the risk of paraffining, so that the flow direction through the first branch line (36) and a n edstroms transfer pump (28) arranged pre-filter (30) water. 14. Forfarande enligt krav 13, kannetecknat av att forfarandet, fore steget att besluta om risk for paraffinering av bransle foreligger, vidare innefattar steget att: 1. identifiera en utomhustemperatur,A method according to claim 13, characterized in that the method, prior to the step of deciding on the risk of paraffining of industry, exists, further comprising the step of: 1. identifying an outdoor temperature, 15. Forfarande enligt nagot av kraven 13 och 14, kannetecknat av att forfarandet, fore steget att besluta om risk for paraffinering av bransle foreligger, vidare innefattar ste- get att: 1. identifiera temperaturen hos fOrbranningsmotom (2).A method according to any one of claims 13 and 14, characterized in that the method, for the step of deciding on the risk of paraffining of fuel, exists, further comprising the step of: 1. identifying the temperature of the combustion engine (2). 16. FOrfarande enligt nagot av kraven 13-15, kannetecknat av att forfarandet, fore steget att besluta om risk for paraffinering av bransle foreligger, vidare innefattar ste- get att nar fOrbranningsmotorn (2) är i drift: 1. identifiera tryckfallet over forfiltret (30).A method according to any one of claims 13-15, characterized in that the method, for the step of deciding on the risk of paraffining of fuel, exists, further comprising the step of when the internal combustion engine (2) is in operation: 1. identifying the pressure drop across the pre-filter ( 30). 17. Forfarande enligt nagot av kraven 13-16, kannetecknat av att forfarandet, fore steget att besluta om risk for paraffinering av bransle foreligger, vidare innefattar ste- get att nar forbranningsmotorn (2) är i drift: 1. identifiera forhaftandet mellan transferpumpens (28) arbete och bransleflodet hos den forsta bransleledningen (36).A method according to any one of claims 13-16, characterized in that the method, for the step of deciding on the risk of paraffining of fuel, exists, further comprising the step that when the combustion engine (2) is in operation: 1. identifying the adhesion between the transfer pump ( 28) work and the industry flow of the first industry management (36). 18. Forfarande enligt nagot av kraven 13-17, kannetecknat av att forfarandet, i sam- band med steget att andra riktningen hos transferpumpen (28), vidare innefattar att: 22 537 172 - styra en nedstroms forfiltret (30) anordnad ventil (70) till ett andra lage, sà att den forsta bransleledningen (36) star i forbindelse med branslesystemet (4) omgivande luft. 23 537 172 1/4 537 172 2/4 CN\ Cski 537 172 3/4 'N. sq. CO ‘1° 537 172 4/4A method according to any one of claims 13-17, characterized in that the method, in connection with the step of the other direction of the transfer pump (28), further comprises: - controlling a valve (70) arranged downstream of the pre-filter (30) ) to a second layer, so that the first branch line (36) is connected to the ambient air of the branch system (4). 23 537 172 1/4 537 172 2/4 CN \ Cski 537 172 3/4 'N. sq. CO ‘1 ° 537 172 4/4
SE1350721A 2013-06-13 2013-06-13 Combustion engine fuel system, internal combustion engine with such a fuel system, vehicles with such a fuel system and a method for reducing the risk of malfunctioning fuel caused by paraffin fuel in a fuel system SE537172C2 (en)

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SE1350721A SE537172C2 (en) 2013-06-13 2013-06-13 Combustion engine fuel system, internal combustion engine with such a fuel system, vehicles with such a fuel system and a method for reducing the risk of malfunctioning fuel caused by paraffin fuel in a fuel system
DE112014002283.7T DE112014002283T5 (en) 2013-06-13 2014-06-10 A fuel system for an internal combustion engine, internal combustion engine with such a fuel system, vehicle having such a fuel system and method for reducing the risk of malfunction due to paraffinized fuel in a fuel system
PCT/SE2014/050697 WO2014200425A1 (en) 2013-06-13 2014-06-10 Fuel system for combustion engine and a method for reducing the risk of operational disturbance caused by paraffined fuel in the fuel system

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US4706636A (en) * 1984-12-06 1987-11-17 Davco Manufacturing Corporation Purge and prime fuel delivery system and method
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US6792966B2 (en) * 2000-10-03 2004-09-21 Federal-Mogul World Wide, Inc. Fuel transfer pump and control
US7770562B2 (en) * 2008-07-31 2010-08-10 Ford Global Technologies, Llc Fuel delivery system for a multi-fuel engine
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