SE537174C2 - 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
SE537174C2
SE537174C2 SE1350720A SE1350720A SE537174C2 SE 537174 C2 SE537174 C2 SE 537174C2 SE 1350720 A SE1350720 A SE 1350720A SE 1350720 A SE1350720 A SE 1350720A SE 537174 C2 SE537174 C2 SE 537174C2
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Sweden
Prior art keywords
fuel
main
combustion engine
fuel tank
filter
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SE1350720A
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Swedish (sv)
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SE1350720A1 (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 SE1350720A priority Critical patent/SE537174C2/en
Priority to PCT/SE2014/050696 priority patent/WO2014200424A1/en
Priority to DE112014002300.0T priority patent/DE112014002300T5/en
Publication of SE1350720A1 publication Critical patent/SE1350720A1/en
Publication of SE537174C2 publication Critical patent/SE537174C2/en

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Classifications

    • 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
    • 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
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/3082—Control of electrical fuel pumps
    • 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
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/406—Electrically controlling a diesel injection pump
    • 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
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
    • F02M31/12—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating electrically
    • F02M31/125—Fuel
    • 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
    • F02M37/30—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by heating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/224—Diagnosis of the fuel system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0606—Fuel temperature
    • 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
    • F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

537 174 Sammandrag Uppfinningen avser ett branslesystem for en forbranningsmotor (2), vilket branslesy- stem (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) samt en huvudmatarpump (26) anordnad att mata bransle frau den forsta bransletanken (20) genom den andra bransleledningen (40) via ett huvudbranslefilter (12) till ett hogtryckssystem (19). En forsta elektrisk motor (M1) är anordnad att driva huvudmatarpumpen (26) van i huvudmatarpumpen (26) är omrikt- 1 0ningsbar, sa att flodesriktningen genom huvudbranslefiltret (12) och den andra bransle- ledningen (40) kan vandas for att tomma huvudbranslefiltret (12) och den andra bransleledningen (40) pa bransle nar risk for paraffinering av bransle har identifierats. Uppfinningen avser aven ett forfarande for att minska risken for driftstorningar orsakade av paraffinerat bransle i ett branslesystem. 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 (2). 20) and the second fuel tank (22), a second fuel line (40) arranged in connection with the first fuel tank (20) and a main feed pump (26) arranged to feed fuel from the first fuel tank (20) through the second fuel line (40). via a main fuel filter (12) to a high pressure system (19). A first electric motor (M1) is arranged to drive the main feed pump (26) used in the main feed pump (26) and is reversible, so that the flow direction through the main fuel filter (12) and the second fuel line (40) can be watered to empty the main fuel filter. (12) and the other industry management (40) in industry when the risk of paraffinization of industry has been identified. The invention also relates to a method for reducing the risk of operational disturbances caused by paraffined fuel in a fuel system.

Description

537 174 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 12, ett fordon med ett sadant branslesystem enligt patentkravet 13 samt ett forfarande for att minska risken for driftstorningar orsakade av paraffinerat bransle i ett brdnslesystem enligt patentkravet 14. 537 174 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 paraffined fuel in a fuel system BACKGROUND OF THE INVENTION AND KAND TECHNOLOGY The invention also relates to an internal combustion engine with such a fuel system according to claim 12, a vehicle with such a fuel system according to claim 13 and a method for reducing the risk of malfunctions caused by paraffined fuel in a fuel system according to claim 14. .

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 forbrdnningsmotorn 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 awn 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. 1 537 174 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 30 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 bransleledningarna. Det är dad& onskvart att minimera ris- ken for att bransle i filterhus och bransleledningar paraffineras i kall vaderlek. Fuel systems include a fuel filter 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 30 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 bransleledningarna 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- 2 537 174 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- 1 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 being left in 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 12 kannetecknande del, ett fordon med ett sadant branslesystem enligt patentkravets 13 kannetecknande del och ett forfarande for att minska risken for 3 537 174 driftstorningar orsakade av paraffinerat bransle i ett branslesystem enligt patentkravets 14 kannetecknande del. These objects are further achieved with an internal combustion engine with such a fuel system according to the pitched part of claim 12, a vehicle with such a fuel system according to the pitched part of claim 13 and a method for reducing the risk of 3,537,174 malfunctions caused by paraffined fuel in a fuel system according to claim 14. pitcher drawing part.

Genom att anordna en elektriskt styrd omriktningsbar huvudmatarpump, i en lagtryckskrets i branslesystemet for en forbranningsmotor, sà att bransleflodet genom huvudbranslefiltret och den andra bransleledningen kan vandas nar risk for paraffinering av bransle har identifierats, astadkommes ett branslesystem, som minskar risken for komplikationer och driftstorningar orsakat av paraffinerat bransle. Lampligen innefattar huvudbranslefiltret ett utbytbart filterelement, vilket är anordnat i ett filterhus. By arranging an electrically controlled reversible main feed pump, in a low pressure circuit in the fuel system for an internal combustion engine, so that the fuel flow through the main fuel filter and the other fuel line can be irrigated once the risk of fuel paraffin has been identified, a fuel system is created. of paraffined fuel. Lampwise, the main fuel filter comprises a replaceable filter element, which is arranged in a filter housing.

Foretradesvis är huvudmatarpumpen en lagtryckspump. Lampligen andras huvudma- tarpumpens riktning, sà att huvudbranslefiltrets filterhus och den andra bransleledningen huvudsakligen toms pa bransle, endast dâ forbranningsmotorn är avstangd och risk for paraffinering av bransle foreligger. Pa sâ sat minskas risken for att paraffinerat bransle igensatter huvudbranslefiltret eller orsakar stopp i den andra bransleledningen. 1Genom att tomma filterhus och bransleledning enbart dâ risk for paraffinering hos branslet foreligger undviks onodig tomning av filterhuset och bransleledningen fOr de fall dâ paraffinering inte foreligger. Darmed behover inte filterhuset och bransleledningen heller aterfyllas med bransle i onodan. Preferably, the main feed pump is a low pressure pump. The direction of the main feeder pump is different, so that the filter housing of the main fuel filter and the other fuel line are mainly emptied of fuel, only when the internal combustion engine is switched off and there is a risk of paraffining of fuel. In this way, the risk of paraffined fuel clogging the main fuel filter or causing a blockage in the other fuel line is reduced. 1By emptying the filter housing and branch line only when there is a risk of paraffining in the branch, unnecessary emptying of the filter housing and branch line is avoided in cases where paraffination is not available. Thus, the filter housing and the branch line do not need to be refilled with fuel in the onodan.

Lampligen är huvudbranslepumpen omriktningsbar genom att rotationsriktningen hos den till huvudbranslepumpen kopplade elektriska motorn andras. The main fuel pump can be reversible by changing the direction of rotation of the electric motor connected to the main fuel pump.

Lampligen styrs huvudmatarpumpen, sâ att dess riktning andras efter en pa forhand bestamd tids stillastaende efter att forbranningsmotorn har stangts ay. Darmed undviks omedelbar tomning av filterhuset och bransleledningen nar forbranningsmotorn stangs ay. For det fall forbranningsmotorn är avstangd under enbart en kort tidsperiod behover damned intc filterhusct och bransleledningen tommas och sedan atcrfyllas mcd bransle. The main feed pump is conveniently controlled so that its direction changes after a predetermined standstill after the internal combustion engine has been shut down. This avoids immediate emptying of the filter housing and the branch line when the internal combustion engine is shut off. In the event that the internal combustion engine is switched off for only a short period of time, the dam down the filter housing and the branch line need to be emptied and then refilled with fuel.

Genom att ansluta huvudmatarpumpen till en styrenhet via en CAN-buss kan huvud- matarpumpen styras mot olika parametrar, sâ som tryck i bransleledningar, tryckfall Over branslefilter, temperaturer etc. Pa sa satt astadkommes ett branslesystem, som är 4 537 174 flexibelt, som har ett bredare styrintervall an kand teknik och som pa sa sat medger en korrekt bransletillforsel till forbranningsmotorn. By connecting the main feed pump to a control unit via a CAN bus, the main feed pump can be controlled against various parameters, such as pressure in industry lines, pressure drop. Over industry filters, temperatures, etc. In this way an industry system is created, which is 4,537,174 flexible, which has a wider control range than known technology and which in this way allows a correct fuel supply to the internal combustion engine.

Lampligen identifieras om risk for paraffinering av bransle foreligger genom att mita utomhustemperaturen. Foretradesvis är en forsta temperaturgivare ansluten till styren- heten for att bestamma utomhustemperaturen hos omgivningen dar fordonet befmner sig. Huvudmatarpumpen kan saledes foretradesvis styras, sâ att dess riktning andras och huvudbranslefiltret och den andra bransleledningen huvudsakligen toms pa brans-le, da utomhustemperaturen understiger ett visst temperaturgransvarde, som motsvarar den temperatur vid vilken branslet paraffineras, och armed indikerar att risk for paraf- finering av bransle foreligger. It is conveniently identified if there is a risk of paraffining of the fuel by measuring the outdoor temperature. Preferably, a first temperature sensor is connected to the control unit to determine the outdoor temperature of the environment where the vehicle is located. The main feed pump can thus preferably be controlled so that its direction is different and the main fuel filter and the second industry line are mainly emptied of the industry, as the outdoor temperature is below a certain temperature threshold, which corresponds to the temperature at which the industry is paraffined, and armed indicates a risk of paraffinization. industry available.

Altemativt identifieras om risk for paraffinering av bransle foreligger genom att mata temperaturen hos forbranningsmotom. Foretradesvis är en andra temperaturgivare an- sluten till styrenheten for att bestamma temperaturen hos forbranningsmotom. Lampli- gen bestams detta genom att mata temperaturen hos fOrbranningsmotoms kylarvatska. Temperaturen hos forbranningsmotorn/kylarvatskan kan indikera om risk for paraffinering av bransle foreligger. Huvudmatarpumpen kan saledes foretradesvis styras, sà att dess riktning andras och huvudbranslefiltret och den andra bransleledningen huvud- sakligen tOms pa bransle, dà forbranningsmotorns temperatur understiger ett visst tem- peraturgransvarde, som motsvarar den temperatur vid vilken branslet paraffineras, och damned indikerar att risk for paraffinering av bransle foreligger. Alternatively, it is identified whether there is a risk of paraffining of the 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. The lamp is determined by feeding the temperature of the internal combustion engine's coolant. The temperature of the internal combustion engine / coolant can indicate whether there is a risk of paraffining of the fuel. The main feed pump can thus preferably be controlled so that its direction is different and the main fuel filter and the second branch line are mainly emptied of the branch, as the temperature of the internal combustion engine is below a certain temperature limit, which corresponds to the temperature at which the branch is paraffined. of industry available.

Altemativt identifieras om risk for paraffinering av bransle foreligger genom att be- stamma tryckfallet over huvudbranslefiltret. Foretradesvis är en forsta tryckgivare an- ordnad uppstroms huvudbranslefiltret och en andra tryckgivare anordnad nedstroms huvudbranslefiltret. Med dessa tryckgivarc kan tryckfall over huvudbranslefiltret bestammas, vilket kan indikera nar huvudbranslefiltret borjar bli igensatt. Igensattning av huvudbranslefiltret kan bero pa helt eller delvis paraffinerat bransle och darned kan tryckfallet Over huvudbranslefiltret indikera om risk for paraffinering foreligger. Hu- vudmatarpumpen kan lampligen styras, sâ att dess riktning andras dâ tryckfallet over huvudbranslefiltret overstiger ett visst tryckfallsgransvarde och damned indikerar att 537 174 risk fOr paraffinering av brdnsle fOreligger. Tryckgivarna är lampligen differentialtryckgivare och är anslutna till styrenheten. Tryckgivama avldses foretradesvis nar forbranningsmotorn är i drift. Alternatively, it is identified whether there is a risk of paraffining of the fuel by determining the pressure drop across the main fuel filter. Preferably, a first pressure sensor is arranged upstream of the main fuel filter and a second pressure sensor is arranged downstream of the main fuel filter. With these pressure sensors, pressure drops across the main fuel filter can be determined, which can indicate when the main fuel filter starts to become clogged. Clogging of the main fuel filter may be due to fully or partially paraffined fuel and then the pressure drop over the main fuel filter may indicate whether there is a risk of paraffining. The main feed pump can suitably be controlled so that its direction changes when the pressure drop across the main fuel filter exceeds a certain pressure drop threshold value and damned indicates that there is a 537 174 risk of paraffining of fuel. The pressure sensors are suitably differential pressure sensors and are connected to the control unit. The pressure sensors are preferably de-energized when the internal combustion engine is in operation.

Igensattning av huvudbranslefiltret kan orsakas av paraffinering men kan likasâ bero pa fororeningar i brdnslet. For att kunna avgora om risk for paraffinering foreligger kombineras foretradesvis det identifierade tryckfallet med utomhustemperaturen och/eller forbranningsmotorns temperatur. Huvudmatarpumpen kan saledes foretrddesvis styras, sâ att dess riktning andras da tryckfallet over huvudbranslefiltret oversti- 1 0ger ett visst tryekfallsgransvarde samtidigt som utomhustemperaturen och/eller for- branningsmotorns temperatur understiger ett visst temperaturgransvarde och darmed indikerar att risk for paraffinering av bränsle foreligger. Clogging of the main fuel filter can be caused by paraffining but can also be due to contaminants in the fuel. 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 main feed pump can thus preferably be controlled so that its direction changes as the pressure drop across the main fuel filter exceeds a certain pressure drop threshold while the outdoor temperature and / or the internal combustion engine temperature is below a certain temperature threshold and thus indicates that there is a risk of paraffinization.

Altemativt identifieras om risk for paraffinering av bransle foreligger genom att fast- stalla forhallandet mellan huvudmatarpumpens arbete och bransleflodet nedstroms huvudbranslefiltret. Lampligen är en flOdesmatare anordnad nedstrOms huvudbranslefiltret, vilken flodesmdtare är ansluten till styrenheten via CAN-bussen. Stromforbrukningen hos den huvudmatarpumpen drivande elmotom mats med hjalp av styrenheten, vilket indikerar hur hart huvudmatarpumpen arbetar. Altemativt mats, med hjalp av styrenheten, effektuttaget hos den huvudmatarpumpen drivande elmotom. En viss stromforbrukning eller ett visst effektuttag hos elmotom motsvarar normalt sett ett visst bransleflode nedstroms huvudbranslefiltret. Saledes innebar en 'Rad stromforbrukning eller ett okat effektuttag att bransleflodet nedstroms huvudbrdnslefiltret okar. Skulle dock styrenheten identifiera en okad stromforbrukning eller ett okat effektuttag samtidigt som brdnsleflodet nedstroms huvudbranslefiltret är oforandrat, kan slutsatsen dras att huvudbranslefiltret troligtvis är igensatt och armed forsvarar for branslet att passera gcnom huvudbranslefiltret. Igensattningen kan bero pa kit eller delvis paraffinerat bransle och darmed kan forhallandet mellan huvudmatarpumpens arbete och bransleflodet nedstroms huvudbranslefiltret indikera att risk for paraffinering av brans- le foreligger. Huvudmatarpumpen kan lampligen styras, ndr forbranningsmotom är avstangd, sâ att dess riktning andras da forhallandet mellan huvudmatarpumpens arbete och bransleflodet nedstroms huvudbranslefiltret indikerar att huvudbranslefiltret är 6 537 174 igensatt. Stromforbrukning och/eller effektuttag samt bransleflode nedstrOms huvudbranslefiltret avlases foretradesvis nar forbranningsmotom är i drift. Alternatively, it is identified whether there is a risk of paraffining of the fuel by establishing the ratio between the work of the main feed pump and the fuel flow downstream of the main fuel filter. Lamply, a flow feeder is arranged downstream of the main fuel filter, which flow meter is connected to the control unit via the CAN bus. The power consumption of the main feed pump driven electric motor is measured with the help of the control unit, which indicates how hard the main feed pump works. Alternative mats, with the help of the control unit, the power outlet of the main feed pump driving electric motor. A certain power consumption or a certain power output of the electric motor normally corresponds to a certain fuel flow downstream of the main fuel filter. Thus, a 'Rad power consumption or an increased power consumption meant that the fuel flow downstream of the main fuel filter increases. However, should the control unit identify an increased power consumption or an increased power output while the fuel flow downstream of the main fuel filter is unchanged, it can be concluded that the main fuel filter is probably clogged and armed defends the industry to pass through the main fuel filter. The clogging may be due to putty or partially paraffined fuel, and thus the relationship between the work of the main feed pump and the fuel flow downstream of the main fuel filter may indicate that there is a risk of paraffining of the industry. The main feed pump can be suitably controlled when the internal combustion engine is switched off, so that its direction changes as the ratio between the operation of the main feed pump and the fuel flow downstream of the main fuel filter indicates that the main fuel filter is clogged. Power consumption and / or power outlets as well as fuel flow downstream The main fuel filter is preferably unloaded when the combustion engine is in operation.

Igensattning av huvudbranslefiltret kan orsakas av paraffinerat bransle men kan likasa bero pa fororeningar i branslet. I syfte att avgara om risk for paraffinering foreligger kombineras foretradesvis det identifierade forftallandet mellan huvudmatarpumpens arbete och bransleflodet nedstroms huvudbranslefiltret med utomhustemperaturen och/eller forbranningsmotorns temperatur. Huvudmatarpumpen kan foretradesvis styras, sa att dess riktning andras da forhallandet mellan huvudmatarpumpens arbete och bransleflodet nedstroms huvudbranslefiltret indikerar att huvudbranslefiltret är igen- satt, samtidigt som utomhustemperaturen och/eller forbranningsmotoms temperatur understiger ett visst temperaturgransvarde. Clogging of the main fuel filter can be caused by paraffined fuel but can also be due to contaminants in the industry. In order to determine if there is a risk of paraffining, the identified decay rate between the operation of the main feed pump and the fuel flow downstream of the main fuel filter is preferably combined with the outdoor temperature and / or the temperature of the internal combustion engine. The main feed pump can preferably be controlled so that its direction changes as the ratio between the operation of the main feed pump and the fuel flow downstream of the main fuel filter indicates that the main fuel filter is clogged, while the outdoor temperature and / or internal combustion engine temperature is below a certain temperature limit value.

Altemativt identifieras om risk for paraffinering av bransle fOreligger genom att kom- binera nagra av eller samtliga ovan namnda satt. Exempelvis kan bade utomhustempe- raturen, temperaturen hos fOrbranningsmotom, tryckfallet och forhallandet mellan huvudmatarpumpens arbete och bransleflodet nedstroms huvudbranslefiltret anvandas for att avgara om risk air paraffinering av bransle foreligger. Alternatively, it is identified whether the risk of paraffining of the industry exists by combining some or all of the above methods. For example, both the outdoor temperature, the temperature of the combustion engine, the pressure drop and the ratio between the operation of the main feed pump and the fuel flow downstream of the main fuel filter can be used to determine if there is any risk of air paraffination of the fuel.

FOretradesvis avlases den fOrsta och/eller den andra temperaturgivaren ndr forbran- ningsmotorn är i drift for att avgora om risk for paraffinering av bransle foreligger. Nar forbranningsmotorn sedan har stangts av och fordonet är stillastaende, styrs huvudmatarpumpen sa att dess riktning andras. Lampligen Ors avlasningen under drift specifikt da byte av temperaturzon sker. Preferably, the first and / or second temperature sensor is read when the internal combustion engine is in operation to determine if there is a risk of paraffining of the industry. When the internal combustion engine has been switched off and the vehicle is stationary, the main feed pump is controlled so that its direction changes. Lampligen Ors the unloading during operation specifically when changing the temperature zone takes place.

Altemativt avlases den forsta och/eller den andra temperaturgivaren da forbranningsmotorn är avstangd och fordonet är stillasthendc. Alternatively, the first and / or the second temperature sensor is read when the internal combustion engine is switched off and the vehicle is stationary.

Altemativt sker avlasning av den forsta och/eller den andra temperaturgivaren bade da forbranningsmotorn är i drift och da forbranningsmotorn är avstangd och fordonet är stillastaende. 7 537 174 FOretradesvis är en varmeanordning anordnad i anslutning till den fOrsta bransletanken. Varmeanordningen kan vara en dieselvarmare, kupevarmare, elektrisk varmare eller nagon annan form av varmare. Varmeanordningen är foretradesvis styrd av en till styrenheten ansluten timer (ett tidur med verkningsfunktion efter eller vid viss installd tid), pa sa salt att varmeanordningen kan startas vid en pa forhand bestamd tidpunkt. Lamp- ligen beraknas den pa forhand bestamda tidpunkten utifran en tidpunkt da forbranningsmotorn onskas starta. Mr risk for paraffinering av bransle foreligger och forbranningsmotorn är avstangd andras huvudmatarpumpens riktning, sa att bransle i huvudbranslefiltret och i den andra bransleledningen leds till den forsta bransletanken. 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. 7 537 174 Preferably, a heating device is arranged in connection with the first fuel tank. The heating device can be a diesel heater, passenger compartment heater, electric heater or any other form of heater. The heating device is preferably controlled by a timer connected to the control unit (a timer with action function after or at a certain set time), so salty that the heating device can be started at a predetermined time. The pre-determined time is calculated according to a time when the internal combustion engine is to be started. There is a risk of paraffining of fuel and the combustion engine is shut off in the direction of the main feed pump of others, so that fuel in the main fuel filter and in the second fuel line is led to the first fuel tank.

Varmeanordningen startas foretradesvis vid en tidpunkt, fore tidpunkten da forbran- ningsmotom onskas starta, sa att branslet har uppnatt en pa forhand bestamd temperatur nar forbranningsmotorn startas igen. Pa sa satt kan eventuellt paraffinerat bransle i den forsta bransletanken varmas upp innan forbranningsmotom startas och pa sa satt astadkommes ett branslesystem som underlattar kallstart. Vidare medfor det uppvarm- da branslet i den forsta bransletanken att eventuellt kvarvarande paraffinerat bransle i huvudbranslefiltret och i den andra bransleledningen omedelbart kan varmas upp och darmed minskas risken for driftstorningar orsakade av paraffinerat bransle. The heating device is preferably started at a time, before the time when the internal combustion engine is to be started, so that the industry has reached a predetermined temperature when the internal combustion engine is started again. In this way, any paraffined fuel in the first fuel tank can be heated before the internal combustion engine is started and in this way a fuel system is created that facilitates cold start. Furthermore, the heated industry in the first industry tank means that any remaining paraffined industry in the main industry filter and in the second industry management can be heated immediately, thereby reducing the risk of operational disruptions caused by paraffined industry.

Foretradesvis bestams tidpunkten for all starta varmeanordningen utifran en av foraren angiven tidpunkt vid vilken han/hon Onskar starta fOrbranningsmotorn igen. Preferably, the time for all starting the heating device is determined from a time specified by the driver at which he / she wishes to start the internal combustion engine again.

Altemativt bestams tidpunkten for att starta varmeanordningen genom att manuellt ange en lämplig tidpunkt fore forbranningsmotorn onskas starta. Altemativt startas varmeanordningen genom anvandning av en fjarrkontroll. Alternatively, the time for starting the heating device is determined by manually entering a suitable time before the internal combustion engine is to be started. Alternatively, the heating device is started by using a remote control.

Lampligen är den forsta brdnsletanken sa utformad att den rymmer en mindre volym an den andra bransletanken. Denna utformning medger en mindre skrymmande forsta bransletank, som är ldttare att anordna hos ett utrymmessnalt chassi. Pa sa satt astadkommes ett icke-skrymmande branslesystem. Vidare innebar en mindre forsta bransle- tank att branslesystemet kan mata bransle till forbrdnningsmotorn vid en lagre bransle- niva an om samma branslevolym hade tillforts den stone andra brdnsletanken. Pa sa salt astadkommes ett branslesystem for en forbranningsmotor, som medger en flexibel 8 537 174 reglering av bransletillfOrseln och armed undviks driftstOrningar vid lag bransleniva i brdnsletanken. Foretradelsevis rymmer den forsta bransletanken 20-50 liter och den andra bransletanken 300-1000 liter. In fact, the first fuel tank is designed to hold a smaller volume than the second fuel tank. This design allows 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 supply fuel to the internal combustion engine at a lower fuel level than if the same fuel volume had been supplied to the second fuel tank. This salt creates an industry system for an internal combustion engine, which allows a flexible 8 537 174 regulation of the fuel supply and armed avoids operational disruptions at low industry levels in the fuel tank. Preferably, the first fuel tank holds 20-50 liters and the second fuel tank 300-1000 liters.

Foretrddelsevis är en transferpump anordnad for att forse den forsta bransletanken med brdnsle. Transferpumpen är ldmpligen en lagtryckspump, vilken matar bransle fran den andra bransletanken via den forsta brdnsleledningen vidare till den forsta brdnsletanken. Foretradesvis är ett forfilter anordnat nedstrom transferpumpen och uppstroms huvudmatarpumpen. Branslet som nar den elmotorstyrda huvudmatarpumpen är pa sa. salt forfiltrerat, vilket medfor att huvudmatarpumpen skyddas mot fororeningar pa ett fordelaktigt sat, vilket minskar risken for driftstorningar hos huvudmatarpumpen. Preferably, a transfer pump is provided to supply the first fuel tank with fuel. The transfer pump is typically a low pressure pump, which feeds fuel from the second fuel tank via the first fuel line to the first fuel tank. Preferably, a pre-filter is arranged downstream of the transfer pump and upstream of the main feed pump. The fuel that reaches the electric motor-controlled main feed pump is on so. salt pre-filtered, which means that the main feed pump is protected against contamination in an advantageous manner, which reduces the risk of malfunctions of the main feed pump.

Foretrddesvis drivs transferpumpen av en andra elektrisk motor. Pa sâ salt astadkommes en mer effektiv och flexibel reglering av brdnsletillforseln till den forsta bränsletanken. Preferably, the transfer pump is driven by a second electric motor. In this way, a more efficient and flexible regulation of the fuel supply to the first fuel tank is achieved.

Ldmpligen är huvudmatarpumpen anordnad hos den forsta brdnsletanken. Pa sâ satt skyddas huvudmatarpumpen frail omgivningen och far en naturlig kylning av branslet i den forsta bransletanken. Alternativt är awn transferpumpen och forfiltret anordnade inuti den forsta bransletanken. Med huvudmatarpumpen, transferpumpen, fOrfiltret och ventilen anordnade inuti den forsta brdnsletanken astadkommes ett icke-skrymmande brdnslesystem. Ideally, the main feed 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 awn 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 provided.

Ldmpligen anordnas en branslereturledning i anslutning till den forsta brdnsletanken och branslesystemets hogtryekssystem. Trycksatt varmt bransle kan pa sâ satt returne- ras tillbaka till den forsta brdnsletanken istallet for att transporteras till forbranningsmotorns forbrdnningsrum. Det varma branslet kan clamed vdrma kallt brdnsle i bransletanken och pa sâ satt minska risken for paraffinering under drift. Usually, a fuel return line is arranged in connection with the first fuel tank and the fuel system's high pressure 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 hot industry can clamed heat cold fuel in the industry tank and thus reduce the risk of paraffining during operation.

Foretrddesvis innefattar den forsta brdnsletanken en nivasensor for att bestamma brans- lenivan i den forsta brdnsletanken. Lampligen är en overstromningsledning anordnad i forbindelse med den forsta bransletanken och den andra bransletanken. Ndr den med 9 537 174 nivasensom bestamda branslenivan i den forsta brdnsletanken overskrider ett forutbestamt nivdgrdnsvdrde leds bransle fran den forsta brdnsletanken via overstromningsledningen till den andra bransletanken. Lampligen är overstromningsledningen anordnad i anslutning till den forsta brdnsletankens ovansida samt den andra brdnsletankens ovansida. Altemativt 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. If the level of industry in the first fuel tank determined by 9 537 174 exceeds a predetermined level value, the industry's industry is led from the first fuel tank via the flood line to the second fuel tank. Lamply, the overflow 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.

Ldmpligen styrs transferpumpen att mata bransle fran den andra brdnsletanken till den forsta brdnsletanken ndr den med nivasensom bestdmda branslenivan i den forsta bransletanken understiger ett forutbestdmt varde. Typically, the transfer pump is controlled to feed fuel from the second fuel tank to the first fuel tank when the level determined by the level 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 bifogade ritningar, pa vilka: Fig. 1visar en schematisk sidovy av ett fordon, som innefattar ett branslesystem for en forbranningsmotor enligt foreliggande uppfinning, Fig. 2visar ett kopplingsschema for ett brdnslesystem enligt en forsta utforings- form av foreliggande uppfinning, och Fig. 3a-3b visar flodesscheman over forfaranden for att minska risken for driftstor- ningar orsakade av paraffinerat brdnsle i ett brdnslesystem enligt foreliggande uppfinning. 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; wiring diagram of a fuel system according to a first embodiment of the present invention, and Figs. 3a-3b 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.

DETALJERAD BESKRIVNING AV EN UTFORINGSFORM AV UPPFINNINGEN Fig. 1 visar en schematisk sidovy av ett fordon 1, vilket fordon innefattar ett branslesystem 4 for en forbranningsmotor 2 enligt foreliggande uppfinning. Forbranningsmotorn 10 537 174 2 är kopplad till en vaxellada 6, som är kopplad till fordonets 1 drivhjul 8 via en transmission. Fordonet innefattar aven ett chassi 10. 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 537 174 2 is connected to a gearbox 6, which is connected to the drive wheel 8 of the vehicle 1 via a transmission. The vehicle also includes a chassis 10.

Fig. 2 visar ett kopplingsschema for ett branslesystem 4 for en forbranningsmotor 2 enligt foreliggande uppfinning. Branslesystemet 4 innefattar flertalet komponenter, varav ett huvudbranslefilter 12, en hogtryckspump 14, en ackumulator i form av en sâ kallad common rail 16 samt ett insprutningssystem 18 schematiskt visat i form av en bransleinsprutare, är anordnade hos forbranningsmotorn 2 (forbranningsmotorn 2 visas i fig. 1). Alternativt kan common rail 16 ersattas av en annan form av insprutningssy- stem 18, exempelvis piezo- eller enhetsinsprutningssystem. Hogtryckspumpen 14, common rail 16 och insprutningssystemet 18 utgor komponenter i branslesystemets 4 hogtryckssystem 19. Branslesystemet 4 innefattar aven en forsta bransletank 20, en andra bransletank 22, en tredje bransletank 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 branslesystemet 4. Vidare innefattar branslesystemet 4 en branslereturledning 13, genom vilken trycksatt varmt 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 in the internal combustion engine 2. 1). Alternatively, common rail 16 can be replaced by another form of injection system 18, for example piezo or unit injection systems. The high 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 also comprises 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 4 high pressure system 19 back to the first fuel tank 20.

Samtliga tre tankar 20, 22, 24 är i sina respektive ovre delar forbundna med en ventilationsledning 50 vilken via ett luftfilter 51 kommunicerar med omgivningen. Ventilationsledningen 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 omgi- vande 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 duct 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 vasentli- gen samma yolym och har ett sjalyreglerade flode mellan yarandra genom ett forbindelseror 34 anordnat mellan den nedre delen hos den andra bransletanken 22 och den 11 537 174 tredje bransletanken 24. Transferpumpen 28 är enligt fig. 2 anordnad mellan den forsta bransletanken 20 och den andra bransletanken 22. Huvudmatarpumpen 26 drivs av en forsta elektrisk motor MI och är anordnad inuti den forsta bransletanken 20 och skyddas pa sa sift fran omgivningen och kyls av branslet. Transferpumpen 28 drivs av en andra elektrisk motor M2 och har som huvuduppgift att mata bransle frail den andra bransletanken 22 till den forsta bransletanken 20 via en forsta bransleledning 36. 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 20 blir overfylld. Hu- vudmatarpumpen 26 är omriktningsbar och har som huvuduppgift att mata branslet frail den forsta bransletanken 20 via en andra bransleledning 40 genom huvudbranslefiltret 12 och vidare 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 yolym and have a shale-regulated flow between yarandra through a connecting pipe 34 arranged between the lower part of the second fuel tank 22 and the third fuel tank 24. The transfer pump 28 is according to Fig. 2 arranged between the first fuel tank 20 and the second fuel tank 22. The main feed pump 26 is driven by a first electric motor MI and is located inside the first fuel tank 20 and is then protected from the environment and cooled by the fuel. The transfer pump 28 is driven by a second electric motor M2 and has as its main task to supply fuel from the second fuel tank 22 to the first fuel tank 20 via a first fuel line 36. Between the first fuel tank 20 and the second fuel tank 22 an overflow line 38 is arranged, so that fuel can be transported from the first fuel tank 20 to the second fuel tank 22 if the first fuel tank 20 becomes overfilled. The main feed pump 26 is adjustable and has as its main task to feed the fuel from the first fuel tank 20 via a second fuel line 40 through the main fuel filter 12 and on 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 by a control unit 42 via a CAN bus 44.

FOrfiltret 30 är anordnat nedstrOms transferpumpen 28 och är fOretradelsevis ett finmaskigt, vattenavskiljande filter. I den andra bransletanken 22, uppstroms transferpumpen 28, är en grovmaskig sil 52 anordnad, igenom vilken transferpumpen 28 suger bransle. Den grovmaskiga silen 52 filtrerar bort partiklar Over en forutbestamd storlek. The pre-filter 30 is arranged downstream of the transfer pump 28 and is preferably a fine-mesh, water-separating filter. In the second fuel tank 22, upstream of the transfer pump 28, a coarse mesh screen 52 is arranged, through which the transfer pump 28 sucks fuel. The coarse mesh screen 52 filters out particles over a predetermined size.

Transferpumpen 28 trycksatter darefter branslet och matar det igenom forfiltret 30, via den forsta bransleledningen 36, vidare till den forsta bransletanken 20. Branslet i den forsta bransletanken 20 har pa sâ sift passerat bade en grovmaskig sil 52 och ett finmaskigt forfilter 30, vilket medfor att huvudmatarpumpen 26, som är anordnad i den forsta bransletanken 20 är skyddad mot fororeningar. Genom att anordna forfiltret nedstroms transferpumpen 28 trycks branslet igenom forfiltret 30, vilket medger att branslet lattare passerar forfiltret 30 och forfiltret 30 Riper pa sâ salt mindre risk att igensattas. 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 then 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 downstream of the transfer pump 28, the fuel is forced through the pre-filter 30, which allows the industry to pass the pre-filter 30 and the pre-filter 30 more easily so that there is less risk of clogging.

I den forsta bransletanken 20 är en forsta nivasensor 46 anordnad for att identifiera branslenivan i den forsta bransletanken 20. Nar den med nivasensorn 46 bestamda branslenivan i den forsta bransletanken 20 understiger ett forutbestamt nivagransvarde styrs transferpumpen 28 att mata bransle frail den andra bransletanken 22 till den forsta 12 537 174 bransletanken 20. En andra nivasensor 48 är anordnad i den andra bransletanken 22 for att identifiera branslenivan i den andra bransletanken 22. Den forsta nivasensorn 46 och den andra nivasensorn 48 är kopplade 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 equivalent, the transfer pump 28 is controlled to supply fuel from the second fuel tank 22 to the first 12 537 174 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 the main feed pump 26.

En forsta tryckgivare 54 är anordnad uppstroms huvudbranslefiltret 12 och en andra tryckgivare 56 är anordnad nedstroms huvudbranslefiltret 12. Genom att mata trycket hos bransleflodet fore och efter huvudbranslefiltret 12 kan skillnaden i tryck, det sakallade tryckfallet over huvudbranslefiltret 12, beraknas. Ett Mgt tryckfall innebar att trycket hos bransleflodet efter huvudbranslefiltret 12 är betydligt lagre an trycket fore huvudbranslefiltret 12. Ett sadant Mgt tryckfall kan indikera att huvudbranslefiltret 12 är igensatt och darmed forsvarar genomforseln av bransle genom huvudbranslefiltret 12. Igensattning kan orsakas av paraffinerat bransle och darmed kan information om tryckfall anvandas for att identifiera om risk fOr paraffinering av bransle foreligger. A first pressure sensor 54 is arranged upstream of the main fuel filter 12 and a second pressure sensor 56 is arranged downstream of the main fuel filter 12. By supplying the pressure of the fuel stream before and after the main fuel filter 12, the difference in pressure, the so-called pressure drop across the main fuel filter 12, can be calculated. A high pressure drop meant that the pressure of the fuel flow after the main fuel filter 12 is significantly lower than the pressure before the main fuel filter 12. Such a high pressure drop can indicate that the main fuel filter 12 is clogged and thus defends the passage of fuel through the main fuel filter 12. Clogging can be caused by paraffin information on pressure drops is used to identify whether there is a risk of paraffining of the industry.

Den forsta och den andra tryckgivaren 54, 56 är anslutna till styrenheten 42 via CAN- bussen 44. The first and second pressure sensors 54, 56 are connected to the control unit 42 via the CAN bus 44.

En till styrenheten 42 ansluten flodesmatare 58 är anordnad nedstroms huvudbransle- filtret 12, for att faststalla forhallandet mellan huvudmatarpumpens 26 arbete och bransleflodet nedstrOms huvudbranslefiltret 12. Med hjalp av styrenheten kan strOm- forbrukningen hos den huvudmatarpumpen 26 drivande elmotorn M1 bestammas. Alternativt bestams, med hjalp av styrenheten 42, effektuttaget hos den huvudmatarpumpen 26 drivande elmotorn Ml. Stromforbrukningen och/eller effektuttaget indikerar hur hart huvudmatarpumpen 26 arbetar. En viss stromforbrukning eller ett visst effekt- uttag motsvarar ett visst bransleflode nedstroms huvudbranslefiltret 12. Skulle styren- heten 42 identifiera en 'Rad stromforbrukning, eller ett okat effektuttag, samtidigt som flodcsmataren 58 identifierar ett vasentligen oforandrat bransleflode, indikeras att huvudbranslefiltret 12 dr igensatt. Igensattning kan orsakas av paraffinerat bransle och darmed kan information om forhdllandet mellan huvudmatarpumpens 26 arbete och bransleflodet nedstroms huvudbranslefiltret 12 anvandas for att identifiera om risk for paraffinering av bransle foreligger. 13 537 174 Vidare är en forsta temperaturgivare 60 ansluten till styrenheten 42. Den forsta temperaturgivaren 60 forser styrenheten 42 med utomhustemperatur hos omgivningen i vii-ken fordonet 1 (visad i Fig. 1) befinner sig. En lag utomhustemperatur kan indikera att risk for paraffinering av brdnsle foreligger. A river feeder 58 connected to the control unit 42 is provided downstream of the main fuel filter 12, to determine the relationship between the operation of the main feed pump 26 and the fuel flow downstream of the main fuel filter 12. By means of the control unit, the power consumption of the main feed pump 26 driving electric motor M1 can be determined. Alternatively, with the aid of the control unit 42, the power output of the main feed pump 26 driving the electric motor M1 is determined. The power consumption and / or power output indicates how hard the main feed pump 26 operates. A certain power consumption or a certain power outlet corresponds to a certain fuel flow downstream of the main fuel filter 12. Should the control unit 42 identify a series of power consumption, or an increased power supply, while the river feeder 58 identifies a substantially unchanged fuel flow, the main fuel filter is indicated. Clogging can be caused by paraffined fuel and thus information about the relationship between the operation of the main feed pump 26 and the fuel flow downstream of the main fuel filter 12 can be used to identify if there is a risk of paraffining of fuel. 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 temp eraturen hos forbranningsmotom 2 (visad i Fig. 1). En lag temperatur hos forbrdnningsmotorn 2 kan indikera att risk for paraffinering av brdnsle foreligger. 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 paraffining of the fuel.

Huvudmatarpumpen 26 är omriktningsbar genom att dess elmotor M1 kan andra rotationsriktning. Huvudmatarpumpen 26 styrs via styrenheten 42 att andra riktning dâ risk for paraffinering av brdnsle har identifierats. Huvudbranslefiltret 12 och den andra brdnsleledningen 40 aims &armed pa briinsle, vilket leds till den fOrsta briinsletanken 20. Pa sâ saft minskas risken for att paraffinerat bransle orsakar stopp i den andra bransleledningen 40 eller orsakar igensattning av huvudbranslefiltret 12. Da olika sammansatningar av- brdnsle (diesel eller biodiesel) paraffineras vid olika temperaturer är det svart att avgara om risk fOr paraffinering foreligger enbart genom att mdta utomhustemperaturen. Genom att kombinera information om utomhustemperatur och/eller forbranningsmotoms 2 temperatur med information om igensatningsgraden hos huvudbranslefiltret 12, astadkommes ett battre underlag for att avgora om risk for paraffinering foreligger. Information om huvudbrdnslefiltrets 12 igensattningsgrad erhalles genom avldsning av den forsta och den andra tryckgivaren 54, 56 °eh/eller genom bestamning av forhafiandet mellan huvudmatarpumpens 26 arbete och bränsie- flodet nedstroms huvudbrdnslefiltret 12, enligt beskrivning ovan. Styrenheten 42 avgor om risk for paraffinering foreligger och styr huvudmatarpumpen 26 ddrefter. The main feed pump 26 is reversible in that its electric motor M1 can other direction of rotation. The main feed pump 26 is controlled via the control unit 42 in the other direction when the risk of paraffining of fuel has been identified. The main fuel filter 12 and the second fuel line 40 aim & armed on fuel, which leads to the first fuel tank 20. This juice reduces the risk of paraffined fuel causing a blockage in the second fuel line 40 or causing clogging of the main fuel filter 12. As different compositions of fuel diesel or biodiesel) is paraffined at different temperatures, it is black to determine if there is a risk of paraffining just by measuring 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 main fuel filter 12, a better basis is provided for determining whether there is a risk of paraffining. Information about the degree of clogging of the main fuel filter 12 is obtained by holding the first and second pressure sensors 54, 56 ° eh / or by determining the ratio between the operation of the main feed pump 26 and the fuel flow downstream of the main fuel filter 12, as described above. The control unit 42 determines if there is a risk of paraffining and controls the main feed pump 26 thereafter.

Vidare är en vdrmeanordning 64 anordnad hos den forsta bransletanken 20 for att vdrma branslet hos den forsta bransletanken 20 ndr forbranningsmotorn 2 är avstangd. Furthermore, a heating device 64 is arranged at the first fuel tank 20 for heating the fuel of the first fuel tank 20 when the internal combustion engine 2 is switched off.

Varmeanordningen 64 är ansluten till styrenheten 42 via CAN-bussen 44 och kan sty- ras av en timer 66, vilken likasâ är ansluten till styrenheten 42. Tidpunkten dâ timem 66 startar vdrmeanordningen 64 bestdms ldmpligen utifran en tidpunkt dâ forbrdn- 14 537 174 ningsmotom 2 Onskas starta igen. Pa sà salt har branslet i den forsta bransletanken 20 uppnatt en pa forhand bestamd temperatur nar forbranningsmotorn 2 ska starta. Eventuellt paraffinerat bransle hos den forsta bransletanken 20 har darmed uppvarmts, vilket underlattar kallstart och pa sâ satt minskas risken for driftstorningar orsakade av paraffinerat bransle. The heating device 64 is connected to the control unit 42 via the CAN bus 44 and can be controlled by a timer 66, which is also connected to the control unit 42. The time at which the timer 66 starts the heating device 64 is determined, based on a time when the combustion engine 2 Want to start again. On such salt, the fuel in the first fuel tank 20 has reached a predetermined temperature when the internal combustion engine 2 is to start. Any paraffined fuel in the first fuel tank 20 has thus been heated, which facilitates cold start and thus reduces the risk of operational disturbances caused by paraffined fuel.

Fig. 3a 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 med den forsta bransletanken 20 samt en huvudmatarpump 26 anordnad att mata bransle fran den forsta bransletanken 20 genom den andra bransleledningen 40 via ett huvudbranslefilter 12 till ett hOgtryckssystem 19. Forfarandet enligt upp- finningen innefattar steget S101 att besluta om risk for paraffinering av bransle fore- ligger. Vidare innefattar fOrfarandet steget S102 att vid risk for paraffinerig samt vid avstangd forbranningsmotor 2 andra huvudmatarpumpens 26 riktning, sâ att bransle som forefinns i huvudbranslefiltret 12 och i den andra bransleledningen 40 leds till den forsta bransletanken 20. Huvudmatarpumpens 26 riktning andras genom att andra rota- tionsriktningen hos en huvudmatarpumpen 26 drivande elmotor Ml. Fig. 3a 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 and a main feed pump 26 arranged to feed fuel from the first fuel tank 20 through the second fuel line 40 via a main fuel filter 12 to a high pressure system 19. The method according to the invention comprises the step S101 of deciding whether there is a risk of paraffining of the fuel. Furthermore, the method comprises step S102 that at risk of paraffinic and at shut-off internal combustion engine 2 the second direction of the main feed pump 26, so that fuel present in the main fuel filter 12 and in the second fuel line 40 is led to the first fuel tank 20. The second feed pump direction 26 is changed by direction of a main feed pump 26 driving electric motor M1.

Fig. 3b visar ett flodesschema Over ett forfarande for att minska risken for driftstorningar orsakade av paraffinerat bransle i branslesystemet 4 enligt 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 anordnad i forbindelse mcd den forsta branslctanken 20 samt en huvudmatarpump 26 anordnad att mata bransle fran den forsta bransletanken 20 genom den andra bransleledningen 40 via ett huvudbranslefilter 12 till ett hogtryckssystem 19. Forfarandet in- nefattar 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 huvud- 537 174 branslefiltret 12, genom att avldsa en fOrsta och en andra tryckgivare 54, 56 anordnade pa bagge sidor om huvudbrdnslefiltret 12. Den forsta och den andra tryckgivaren 54, 56 är anslutna till styrenheten 42. Genom att identifiera tryckfallet over huvudbranslefiltret 12 ges en indikation pa om huvudbranslefiltret 12 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 tryckfallet indikerar att huvudbranslefiltret 12 är igensatt samtidigt som utomhustemperaturen understiger ett temperaturgransvarde, styrs huvudmatarpumpen 26 i steg S204 av styrenheten 42 att andra riktning, ndr for- branningsmotorn 2 är avstangd och fordonet 1 har varit stillastaende under en pa for- hand bestamd tidsperiod. Huvudmatarpumpens 26 riktning Andras genom att Andra rotationsriktningen hos en huvudmatarpumpen 26 drivande elmotor Ml. Pa sâ sat sugs brAnsle, som forefinns hos huvudbranslefiltret 12 samt hos den andra bransleledningen 40, med huvudmatarpumpen 26 till den fOrsta briinsletanken 20. Vidare i steg S20 bestams en tidpunkt da. en i anslutning till den fOrsta bransletanken 20 anordnad var- meanordning 64 ska startas. Tidpunkten bestams ldmpligen utifran da fOrbranningsmotorn 2 onskas starta, sâ att branslet hos den fOrsta brAnsletanken 20 har uppnatt en pa. fOrhand bestamd temperatur ndr forbranningsmotorn 2 startas. Forfarandet innefattar vidare steget S206 att via en till styrenheten 42 ansluten timer 66 starta varmeanord- ningen 64 vid den bestamda lampliga tidpunkten. PA sa sat \Tams eventuellt paraffine- rat bransle hos den fOrsta bransletanken 20 och kallstart av forbranningsmotorn 2 underlattas. Fig. 3b 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 and a main feed pump 26 arranged feeding fuel from the first fuel tank 20 through the second fuel line 40 via a main fuel filter 12 to a high pressure system 19. The method includes 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 main fuel filter 12 is identified, by holding a first and a second pressure sensor 54, 56 arranged on rear sides of the main fuel filter 12. The first and the second pressure sensor 54, 56 are connected to the control unit 42. By identifying the pressure drop across the main fuel the filter 12 is given an indication of whether the main fuel filter 12 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 main fuel filter 12 is clogged while the outdoor temperature is below a temperature threshold, the main feed pump 26 is controlled in step S204 by the control unit 42 that the other direction, when the internal combustion engine 2 is off and the vehicle 1 has been stationary for a predetermined period. Direction of the main feed pump 26 Second by the Second direction of rotation of a main feed pump 26 driving electric motor M1. Then fuel, which is present at the main fuel filter 12 and at the second fuel line 40, is sucked with the main feed pump 26 to the first fuel tank 20. Further in step S20, a time is then determined. a heating device 64 arranged in connection with the first fuel tank 20 is to be started. The time is usually determined from when the combustion engine 2 is to be started, so that the fuel of the first fuel tank 20 has reached one. Predefined temperature when the internal combustion engine 2 is started. The method further comprises the step S206 of starting the heating device 64 at a determined lamp time via a timer 66 connected to the control unit 42. PA thus sat \ Tams any paraffined fuel at the first fuel tank 20 and cold start of the internal combustion engine 2 is omitted.

Alternativt innefattar steget S201 att identifiera temperaturen hos forbranningsmotorn 2 istallet for utomhustemperaturen. Forbranningsmotorns 2 temperatur erhalles lämpli- gen genom avlasning av en andra temperaturgivare 62 ansluten till styrenheten 42. Alternatively, the 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.

Alternativt innefattar steget S201 att identifiera utomhustemperaturen med temperaturgivaren 60 samt att identifiera forbranningsmotorns 2 temperatur med temperaturgiva- ren 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. 16 537 174 Alternativt innefattar steget S202 att identifiera forhallandet mellan huvudmatarpumpens 26 arbete och bransleflodet nedstroms huvudbranslefiltret 12. Detta astadkommes genom en till styrenheten 42 ansluten flodesmatare 58 samt genom styrenheten 42 be- stamda varden pa stromforbrukning och/eller effektuttag hos den huvudmatarpumpen 26 drivande elmotorn Ml. Genom att bestamma elmotorns M1 stromforbrukning/effektuttag samt bransleflodet nedstroms huvudbransleflltret 12 kan indikation erhallas om igensattning av huvudbranslefiltret 12. Alternatively, step S201 includes identifying the outdoor temperature with the temperature sensor 60 and identifying the temperature of the internal 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 paraffinizing industry. Alternatively, step S202 comprises identifying the relationship between the operation of the main feed pump 26 and the fuel flow downstream of the main fuel filter 12. This is accomplished by a flow feeder 58 connected to the controller 42 and by the controller 42 the rated power consumption and / or power output of the main feed pump 26. Ml. By determining the current consumption / power output of the electric motor M1 and the fuel flow downstream of the main fuel filter 12, an indication can be obtained of clogging of the main fuel filter 12.

Temperaturgivarna 60, 62 kan avlasas bade under drift och da forbranningsmotorn 2 är avstangd. Tryckgivarna 54, 56, flodesmataren 58 samt stromforbrukning/effektuttag avlases lampligen under drift. The temperature sensors 60, 62 can be read both during operation and when the internal combustion engine 2 is switched off. The pressure sensors 54, 56, the river feeder 58 and the power consumption / power outlet are readily read during operation.

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

Claims (2)

537 174 Patentkrav 1. Branslesystem for en forbranningsmotor (2), vilket branslesystem (4) innefattar en forsta bransletank (20) , en andra bransletank (22), en forsta bransleledning (36) an- ordnad i forbindelse med den forsta bransletanken (20) och den andra bransletanken (22) , en andra bransleledning (40) anordnad i forbindelse med den forsta bransletanken (20) samt en huvudmatarpump (26) anordnad att mata bransle fran den forsta bransletanken (20) genom den andra bransleledningen (40) via ett huvudbranslefilter (12) till ett hogtryckssystem (19), kannetecknat av att en forsta elektrisk motor (M1) är anordnad att driva huvudmatarpumpen (26) van i huvudmatarpumpen (26) är omrikt- ningsbar, sâ att flodesriktningen genom huvudbranslefiltret (12) och den andra bransleledningen (40) kan vandas for att tomma huvudbranslefiltret (12) och den andra bransleledningen (40) pa bransle nar risk for paraffinering av bransle har identifierats. 2. Branslesystem enligt krav 1, kannetecknat av att huvudmatarpumpen (26) är om- riktningsbar genom att rotationsriktningen hos dess elektriska motor (MI) andras. 3. Branslesystem enligt nagot av foregaende krav, kannetecknat av att huvudmatarpumpen (26) är ansluten till en styrenhet (42). 4. Branslesystem enligt nagot av foregaende krav, kannetecknat av att en forsta och en andra tryckgivare (54, 56) är anordnade pa bagge sidor om huvudbranslefiltret (12). 5. Branslesystem enligt nagot av foregaende krav, kannetecknat av att branslesyste- met (4) innefattar en forsta och en andra temperaturgivare (60, 62), for bestamning av utomhustemperatur respektive temperatur hos forbranningsmotorn (2). 6. Branslesystem enligt nagot av foregaende krav, kannetecknat av att en flodesmatare (58) är anordnad nedstroms huvudbranslefiltret (12). 7. Branslesystem enligt nagot av foregaende krav, kannetecknat av att en varmeanordning (64) är anordnad i anslutning till den forsta bransletanken (20). 18 537 174 8. Branslesystem enligt krav 7, kannetecknat av att varmeanordningen (64) är styrd av en timer (66). 9. Brdnslesystem enligt nagot av foregaende krav, kannetecknat av att den forsta bransletanken (20) ar sâ utformad att den rymmer en mindre volym an den andra bransletanken (22). 10. Branslesystem enligt nagot foregaende krav, kinnetecknat av att huvudmatar- pumpen (26) är anordnad inuti den forsta bransletanken (20). 11. Branslesystem enligt nagot av foregaende krav, kannetecknat av att en transfer-pump (28) är anordnad att mata bransle fran den andra bransletanken (22) till den forsta bransletanken (20). 12. FOrbranningsmotor (2) kannetecknad av att den innefattar ett branslesystem (4) enligt nagot av kraven 1-11. 13. Fordon (1) kannetecknat av att det innefattar ett branslesystem (4) enligt nagot av kraven 1-11. 14. 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 brdnsleledning (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) samt en huvudmatarpump (26) anordnad att mata bransle fran den forsta bransletanken (20) genom den andra bransleledningen (40) via ett huvudbranslefilter (12) till ett hogtryckssystem (19), kannetecknat av stegen att: - besluta om risk for paraffinering av bransle foreligger, 19 537 174 1. andra huvudmatarpumpens (26) riktning, vid risk for paraffinering samt vid avstangd forbrdnningsmotor (2), sa aft brdnsle som forefinns i huvudbrdnslefiltret (12) och i den andra brdnsleledningen (40) leds till den forsta brdnsletanken (20). 15. Forfarande enligt krav 14, kannetecknat av att forfarandet, fore steget att besluta om risk for paraffinering av brdnsle foreligger, vidare innefattar steget att: 1. identifiera en utomhustemperatur, 16. Forfarande enligt nagot av kraven 14 och 15, kannetecknat av att forfarandet, fore steget att besluta om risk for paraffinering av brdnsle foreligger, vidare innefattar ste- get att: 1. identifiera temperaturen hos forbranningsmotom (2). 17. FOrfarande enligt nagot av kraven 14-16, kannetecknat av att forfarandet, fore steget att besluta om risk for paraffinering av brdnsle foreligger, vidare innefattar ste- get att ndr fOrbranningsmotorn (2) är i drift: 1. identifiera tryckfallet over huvudbranslefiltret (12). 18. Forfarande enligt nagot av kraven 14-17, kannetecknat av att forfarandet, fore steget att besluta om risk for paraffinering av brdnsle foreligger, vidare innefattar ste- get att nar forbranningsmotorn (2) är i drift: 1. identifiera forhdllandet mellan huvudmatarpumpens (26) arbete och brdnsleflodet nedstroms huvudbranslefiltret (12). 19. Forfarande enligt nagot av kraven 14-18, kannetecknat av att forfarandet, efter steget att andra riktningen hos huvudmatarpumpen (26), vidare innefattar stegen att: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) and a main feed pump (26) arranged to feed fuel from the first fuel tank (20) through the second fuel line (40) via a main fuel filter (12) for a high pressure system (19), characterized in that a first electric motor (M1) is arranged to drive the main feed pump (26) used in the main feed pump (26), so that the flow direction through the main fuel filter (12) and the second branch line (40) can be used to empty the main fuel filter (12) and the second branch line (40) on the branch when the risk of paraffin branching has been identified. Fuel system according to claim 1, characterized in that the main feed pump (26) is adjustable by changing the direction of rotation of its electric motor (MI). Fuel system according to one of the preceding claims, characterized in that the main feed pump (26) is connected to a control unit (42). Fuel system according to one of the preceding claims, characterized in that a first and a second pressure sensor (54, 56) are arranged on rear sides of the main fuel filter (12). 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. A fuel system according to any one of the preceding claims, characterized in that a river feeder (58) is arranged downstream of the main fuel filter (12). Fuel system according to one of the preceding claims, characterized in that a heating device (64) is arranged in connection with the first fuel tank (20). A fuel system according to claim 7, characterized in that the heating device (64) is controlled by a timer (66). Fuel system according to one of the preceding claims, characterized in that the first fuel tank (20) is designed to hold a smaller volume than the second fuel tank (22). Fuel system according to one of the preceding claims, characterized in that the main feed pump (26) is arranged inside the first fuel tank (20). Fuel system according to any one of the preceding claims, characterized in that a transfer pump (28) is arranged to supply fuel from the second fuel tank (22) to the first fuel tank (20). Internal combustion engine (2) characterized in that it comprises a fuel system (4) according to any one of claims 1-11. Vehicle (1) characterized in that it comprises a fuel system (4) according to any one of claims 1-11. 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 branch line (40) arranged in connection with the first fuel tank (20) and a main feed pump (26) arranged to feed fuel from the first fuel tank (20) through the second fuel line (40) via a main fuel filter (12) to a high pressure system (19), characterized by the steps of: - deciding whether there is a risk of paraffining of fuel, 19 537 174 1. direction of the second main feed pump (26), in case of risk of paraffination and when the internal combustion engine (2) is switched off, the fuel present in the main fuel filter (12) and in the second fuel line (40) is led to the first fuel tank (20). A method according to claim 14, characterized in that the method, prior to the step of deciding on the risk of paraffining of fuel, further comprises the step of: 1. identifying an outdoor temperature, 16. A method according to any one of claims 14 and 15, characterized in that the method , before the step of deciding whether there is a risk of paraffining of fuel exists, the step further comprises: 1. identifying the temperature of the combustion engine (2). A method according to any one of claims 14-16, characterized in that the method, before the step of deciding on the risk of paraffining of fuel is present, further comprises the step of changing the combustion engine (2): 1. identifying the pressure drop across the main fuel filter ( 12). A method according to any one of claims 14-17, characterized in that the method, before the step of deciding on the risk of paraffining of fuel exists, further comprises the step that when the internal combustion engine (2) is in operation: 1. identifying the relationship between the main feed pump ( 26) work and the fuel flow downstream of the main fuel filter (12). A method according to any one of claims 14-18, characterized in that the method, after the step of the other direction of the main feed pump (26), further comprises the steps of: 1. bestamma tidpunkt for start av en i anslutning till den forsta brdnsletanken (20) anordnad varmeanordning (64);Determining the time for starting a heating device (64) arranged in connection with the first fuel tank (20); 2. starta varmeanordningen (64) sa att branslet i den forsta brdnsletanken (20) har uppnatt en pd forhand bestamt temperatur vid start av forbranningsmotorn (2). 537 1742. start the heating device (64) so that the fuel in the first fuel tank (20) has reached a predetermined temperature when starting the internal combustion engine (2). 537 174
SE1350720A 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 SE537174C2 (en)

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SE1350720A SE537174C2 (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
PCT/SE2014/050696 WO2014200424A1 (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
DE112014002300.0T DE112014002300T5 (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

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SE1350720A SE537174C2 (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

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IT202000029540A1 (en) * 2020-12-03 2021-03-03 Adriano Cordisco Method and device for using biodiesel in internal combustion engines (diesel cycle)
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