SE537848C2 - Combustion engine fuel system, internal combustion engine with such a fuel system, vehicles with such a fuel system and a method for regulating 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 regulating a fuel system Download PDF

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Publication number
SE537848C2
SE537848C2 SE1350521A SE1350521A SE537848C2 SE 537848 C2 SE537848 C2 SE 537848C2 SE 1350521 A SE1350521 A SE 1350521A SE 1350521 A SE1350521 A SE 1350521A SE 537848 C2 SE537848 C2 SE 537848C2
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Sweden
Prior art keywords
fuel
fuel tank
tank
line
temperature
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SE1350521A
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Swedish (sv)
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SE1350521A1 (en
Inventor
Dan Cedfors
Kim Kylström
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Scania Cv Ab
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Priority to SE1350521A priority Critical patent/SE537848C2/en
Priority to PCT/SE2014/050501 priority patent/WO2014178776A1/en
Priority to EP14791373.5A priority patent/EP2992203B1/en
Priority to BR112015025090-4A priority patent/BR112015025090B1/en
Publication of SE1350521A1 publication Critical patent/SE1350521A1/en
Publication of SE537848C2 publication Critical patent/SE537848C2/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
    • F02M37/106—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir the pump being installed in a sub-tank
    • 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
    • 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
    • F02M31/16—Other apparatus for heating 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
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/20—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for cooling
    • 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
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • 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
    • 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
    • F02M31/14—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating by using heat from working cylinders or cylinder heads
    • 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
    • F02M31/20—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for cooling
    • F02M31/205—Control
    • 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
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • F02M37/0035—Thermo sensitive valves
    • 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
    • F02M37/24—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by water separating means

Abstract

Sammandrag Uppfinningen avser ett branslesystem (4) som innefattar en fOrsta bransletank (20) och en andra bransletank (22). Branslet leds fra'n den forsta bransletanken(20) till ett hogtryckssystem (19). En huvudmatarpump (26) matar bransle fran den forsta bransletanken (20) via en andra ledning (40) och en transferpump (28) matar bransle fran den andra bransletanken (22) till den forsta bransletanken (20) via den forsta bransleledningen (36). En forsta elektrisk motor (M1) driver huvudmatarpunnpen (26), och är anordnad i den forsta bransletanken (20). Den f6rsta bransletanken (20) rymmer en mindre volym an den andra bransletanken (22). En branslereturledning (13) är anordnad att returnera trycksatt bransle fran hogtryckssystennet (19) till den f6rsta bransletanken (20). Branslesystemet (4) innefattar vidare ett arrangemang for att reglera bransletemperaturen i den forsta bransletanken (20) genom att reglera flodet av branslet till den forsta bransletanken (20). Uppfinningen avser aven en forbranningsmotor (2) och ett fordon (1) sonn innefattar systemet samt ett fOrfarande f6r att reglera ett branslesystem (4). Summary The invention relates to a fuel system (4) comprising a first fuel tank (20) and a second fuel tank (22). The fuel is led from the first fuel tank (20) to a high-pressure system (19). A main feed pump (26) feeds fuel from the first fuel tank (20) via a second line (40) and a transfer pump (28) feeds fuel from the second fuel tank (22) to the first fuel tank (20) via the first fuel line (36). . A first electric motor (M1) drives the main feed punch (26), and is arranged in the first fuel tank (20). The first fuel tank (20) holds a smaller volume than the second fuel tank (22). A fuel return line (13) is arranged to return pressurized fuel from the high pressure system (19) to the first fuel tank (20). The fuel system (4) further comprises an arrangement for controlling the fuel temperature in the first fuel tank (20) by regulating the flow of the fuel to the first fuel tank (20). The invention also relates to an internal combustion engine (2) and a vehicle (1) which comprises the system and a method for regulating a fuel system (4).

Description

Branslesystem for forbranningsmotor, forbranningsmotor med ett sadant branslesystem, fordon med eft sidant branslesystem och eft fOrfarande for aft reglera eft branslesystem. Fuel system for internal combustion engine, internal combustion engine with one such fuel system, vehicles with one side fuel system and one procedure for aft regulating one fuel system.

TEKNIKENS OMRADE Foreliggande uppfinning avser ett branslesystem for en farbranningsmotor, farbranningsmotor med ett sadant branslesystem, fordon med ett sadant branslesystem samt ett forfarande far att reglera ett branslesystem. FIELD OF THE INVENTION The present invention relates to a fuel system for a combustion engine, a combustion engine with such a fuel system, a vehicle with such a fuel system and a method for regulating a fuel system.

UPPFINNINGENS BAKGRUND OCH KAND TEKNIK Farbranningsmotorer, sasom dieselmotorer eller ottomotorer, anvands i flera typer av applikationer och fordon i dag, till exempel i tunga fordon, sasom lastbilar eller bussar, personbilar, motorbatar, fartyg, farjor eller skepp. Forbranningsmotorer anvands aven i industrimotorer och/eller motordrivna industrirobotar, kraftverk, sasom tex. elkraftverk som innefattar en dieselgenerator, och i lok. BACKGROUND OF THE INVENTION AND KNOWLEDGE TECHNOLOGY Combustion engines, such as diesel or otto engines, are used in several types of applications and vehicles today, for example in heavy vehicles, such as trucks or buses, cars, motor boats, ships, ferries or ships. Internal combustion engines are also used in industrial engines and / or motor-driven industrial robots, power plants, such as e.g. electric power plants that include a diesel generator, and in locomotives.

For farbranningsmotorer finns en mangd olika kommersiellt tillgangliga branslen, sa som till exempel etanol, biodiesel (FAME), diesel och bensin. Dessa motorer är forsedda med ett branslesystem for att transportera branslet frail en eller flera bransletankar till forbranningsmotorns insprutningssystem. For internal combustion engines, there are a variety of commercially available industries, such as ethanol, biodiesel (FAME), diesel and petrol. These engines are equipped with a fuel system to transport the fuel from one or more fuel tanks to the internal combustion engine injection system.

Branslesystemet innefattar en eller flera branslepumpar som kan till exempel drivas mekaniskt av forbranningsmotorn eller drivas av en elmotor. Branslepumparna skapar ett bransleflode och tryck for att transportera branslet till forbranningsmotorns insprutningssystem, vilket tiff& branslet till forbranningsmotorns forbranningsrum. The fuel system comprises one or more fuel pumps which can, for example, be mechanically driven by the internal combustion engine or driven by an electric motor. The fuel pumps create an industry flow and pressure to transport the industry to the internal combustion engine's injection system, which tiff & the industry to the internal combustion engine's combustion chamber.

Branslesystemet kan innefatta en eller flera lagtryckspumpar samt en hagtryckspump. Flagtryckspumpen matar bransle till en ackumulator som kan 1 vara i form av en sá kallad common rail och vidare till ett insprutningssystem. Common rail kan uteslutas och branslesystemet kan istallet innefatta en annan form av insprutningssystem, exempelvis piezo- eller enhetsinsprutningssystem. Trycksatt varmt bransle kan returneras tillbaka till bthnsletanken istallet for alt transporteras till forbranningsmotorns forbranningsrum, for alt skydda forbranningsmotorn och insprutningssystemet. Det varma branslet kan pa sa satt varma kallt bthnsle i bransletanken och darmed minskar risken for paraffinering. Det trycksatta varma branslet kan dock medfora aft branslet i bransletanken blir for varmt, vilket kan paverka delar av branslesystemet negativt. The fuel system may comprise one or more low pressure pumps as well as a high pressure pump. The flag pressure pump feeds fuel to an accumulator which can 1 be in the form of a so-called common rail and further to an injection system. Common rail can be excluded and the industry system may instead comprise another form of injection system, for example piezo or unit injection system. Pressurized hot fuel can be returned to the fuel tank instead of being transported to the internal combustion engine combustion chamber, to protect the internal combustion engine and injection system. The hot industry can thus put hot cold water in the industry tank and thus reduce the risk of paraffining. However, the pressurized hot fuel can cause the fuel in the fuel tank to become too hot, which can negatively affect parts of the fuel system.

Det finns branslesystem som innefattar en sa kallad tekniktank, vilken har en mycket mindre volym an huvudtanken eller huvudtankarna. Syftet med tekniktanken är att underlatta till exempel starten av forbranningsmotom om huvudtankarna inte ar fyllda med tillrackligt bransle. There are industry systems that include a so-called technology tank, which has a much smaller volume than the main tank or tanks. The purpose of the technology tank is to facilitate, for example, the start of the internal combustion engine if the main tanks are not filled with sufficient fuel.

Olika fOrfaranden och system har foreslagits i den kanda tekniken for all returnera bransle fran en forbranningsmotor till en huvudbransletank. Till exempel i dokumentet DE 10010517 Al visas ett branslesystem for en forbranningsmotor, vilket innefattar en huvudbransletank och en mindre extratank. En hogtryckspump pumpar bransle frail extratanken till forbranningsmotorn och en lagtryckspump pumpar bransle fran huvudtanken till extra tanken. Lagtryckspumpen forser extratanken med mer bransle an vad hOgtryckspumpen kan ta emot. Det overflodiga branslet kommer darfor aft stromma genom en overstromningsledning till en branslereturledning genom vilken det varma trycksatta branslet returneras tillbaka till huvudtanken. Det varma branslet blandas saledes med kallt bransle och kyls darmed fare del returneras till huvudbransletanken. Various methods and systems have been proposed in the prior art for all returning fuel from an internal combustion engine to a main fuel tank. For example, document DE 10010517 A1 discloses a fuel system for an internal combustion engine, which includes a main fuel tank and a smaller auxiliary tank. A high pressure pump pumps fuel from the auxiliary tank to the internal combustion engine and a low pressure pump pumps fuel from the main tank to the auxiliary tank. The low pressure pump provides the extra tank with more fuel than what the high pressure pump can receive. The excess fuel will therefore flow through an overflow line to a fuel return line through which the hot pressurized fuel is returned to the main tank. The hot fuel is thus mixed with cold fuel and thus cooled, the danger part is returned to the main fuel tank.

Olika forfaranden och system med dubbla huvudbransletankar är kanda inom teknikomradet. I dessa system har det foreslagits ett fOrfarande dar man med en ventil kan styra returnerat varmt bransle till en andra huvudbransletank om 2 temperaturen i en forsta huvudbransletank är for hog. Till exempel, i dokumentet US 5197443 A visas ett branslesystem for en forbranningsmotor, vilket innefattar dubbla bransletankar, vilka är forbundna med varandra. Bransle pumpas fran den forsta bransletanken till forbranningsmotorn. Varmt bransle returneras fran forbranningsmotorn, via en aterforingsledning, tillbaka till den forsta bransletanken. I aterforingsledningen är en ventil anordnad och ventilen styrs beroende pa temperaturen pa branslet i den forsta bransletanken. Om temperaturen är for hag styrs ventilen sa att det varma branslet returneras till den andra bransletanken istallet. Various procedures and systems with dual main fuel tanks are known in the art. In these systems, a method has been proposed where a valve can control returned hot fuel to a second main fuel tank if the temperature in a first main fuel tank is too high. For example, the document US 5197443 A discloses a fuel system for an internal combustion engine, which comprises double fuel tanks, which are connected to each other. Fuel is pumped from the first fuel tank to the internal combustion engine. Hot fuel is returned from the internal combustion engine, via a feed line, back to the first fuel tank. A valve is arranged in the supply line and the valve is controlled depending on the temperature of the fuel in the first fuel tank. If the temperature is for hag, the valve is controlled so that the hot fuel is returned to the other fuel tank instead.

Trots kanda losningar pa omradet firms det fortfarande ett behov av att vidareutveckla ett branslesystem, som bidrar till att minska bransleforbrukning och minskar risken for skader i branslesystemet orsakade av varmt returnerat bransle. Despite known solutions in the area, there is still a need to further develop a fuel system, which helps to reduce fuel consumption and reduces the risk of damage to the fuel system caused by hot-returned fuel.

SAMMANFATTNING AV UPPFINNINGEN Syftet med foreliggande uppfinning är att astadkomma ett branslesystem, som bidrar till att bransleforbrukningen kan minskas. Det är ett ytterligare syfte med uppfinningen att astadkomma ett branslesystem, som medger en flexibel reglering av bransletillforseln och som minskar parasitforlusterna. SUMMARY OF THE INVENTION The object of the present invention is to provide a fuel system which contributes to the reduction of fuel consumption. It is a further object of the invention to provide a fuel system which allows a flexible control of the fuel supply and which reduces parasite losses.

Syftet med uppfinningen ar ocksa all astadkomma ett branslesystem for en farbranningsmotor, som minskar risken for paraffinering av branslet. The object of the invention is also to provide a fuel system for a combustion engine, which reduces the risk of paraffining of the fuel.

Dessa syften uppnas med ett branslesystem som definieras i patentkrav 1 och ett farfarande for all reglera ett branslesystem som definieras i patentkrav 13. These objects are achieved with an industry system as defined in claim 1 and a procedure for all regulating an industry system as defined in claim 13.

Enligt uppfinningen uppnas syftena ovan med ett branslesystem for en forbranningsmotor som innefattar en forsta bransletank och en andra bransletank. En forsta bransleledning är anordnad i forbindelse med den forsta bransletanken och den andra bransletanken och en andra bransleledning är 3 anordnad aft leda bransle frail den fOrsta bransletanken till ett hogtryckssystem. Systemet innefattar aven en huvudmatarpump samt en transferpump. Huvudmatarpumpen är anordnad att mata bransle fran den fOrsta bransietanken via den andra ledningen och transferpumpen är anordnad att mata bransle fran den andra bransletanken till den forsta bransletanken via den forsta bransleledningen. Enligt uppfinningen är en fOrsta elektrisk motor anordnad aft driva huvudmatarpumpen. Huvudmatarpurnpen är anordnad i den fOrsta bransletanken. Den forsta bransletanken, som i defta sammanhang aven kallas for en tekniktank, ar sa ufformad att den rymmer en mindre volym an den andra bransletanken, som i detta sammanhang kallas aven for en huvudbransletank. En branslereturledning är anordnad att returnera trycksatt bransle fran hogtryckssystemet till den ftirsta bransletanken. According to the invention, the above objects are achieved with a fuel system for an internal combustion engine which comprises a first fuel tank and a second fuel tank. A first branch line is arranged in connection with the first branch tank and the second branch tank and a second branch line is arranged to lead the branch from the first branch tank to a high pressure system. The system also includes a main feed pump and a transfer pump. The main feed pump is arranged to feed fuel from the first industry tank via the second line and the transfer pump is arranged to feed fuel from the second fuel tank to the first fuel tank via the first branch line. According to the invention, a first electric motor is provided to drive the main feed pump. The main feed pump is arranged in the first fuel tank. The first fuel tank, which in this context is also called a technology tank, is so shaped that it holds a smaller volume than the second fuel tank, which in this context is also called a main fuel tank. A fuel return line is arranged to return pressurized fuel from the high pressure system to the first fuel tank.

Branslesystemet innefattar ett arrangemang for att reglera bransletemperaturen i den forsta bransletanken genom att flodet av branslet till den fOrsta bransletanken regleras. Flodet till den forsta bransletanken kan komma bade fran hogtryckssystemet via branslereturledningen och/eller frail den andra bransletanken (huvudbransletanken) och/eller fran flera huvudbransletankar. Nar flodet kommer fran huvudbransletanken kan kylning av branslet i den forsta bransletanken uppnas och nar floclet kommer fran hogtryckssystemet kan uppvarmning av branslet i den forsta bransletanken uppnas. Genom att reglera flodet, dvs. bade mangden av flociet och varifran flodet kommer, till den forsta bransletanken kan risken for skador hos forbranningsmotorn orsakade av Overhettat bransie minskas. The fuel system comprises an arrangement for regulating the fuel temperature in the first fuel tank by regulating the flow of the fuel to the first fuel tank. The flow to the first fuel tank can come both from the high pressure system via the fuel return line and / or from the second fuel tank (main fuel tank) and / or from several main fuel tanks. When the flood comes from the main fuel tank, cooling of the fuel in the first fuel tank can be achieved and when the floc comes from the high pressure system, heating of the fuel in the first fuel tank can be achieved. By regulating the river, ie. both the amount of the flociet and where the river comes from, to the first fuel tank, the risk of damage to the internal combustion engine caused by overheated fuel can be reduced.

Uppfinningen avser aven en forbranningsnnotor och ett fordon som innefattar det ovan beskrivna systemet. The invention also relates to a combustion engine and a vehicle comprising the system described above.

Enligt en annan aspekt avser uppfinningen ett forfarande for aft reglera ett branslesystem, vilket branslesystem innefattar en forsta bransletank, en andra bransletank, en forsta bransleledning anordnad i fOrbindelse med den forsta bransletanken och den andra bransletanken, en andra bransleledning 4 anordnad aft leda bransle fran den forsta bransletanken till eft hrigtryckssystem, en huvudmatarpump samt en transferpump. Huvudmatarpumpen är anordnad aft mata bransle fran den forsta bransletanken via den andra ledningen och transferpumpen är anordnad aft mata bransle fran den andra bransletanken till den forsta bransletanken via den forsta bransleledningen, van i forfarandet innefattar stegen aft: returnera trycksatt bransle fran hogtryckssystennet till den frirsta bransletanken, genom aft leda branslet fran hogtryckssystemet via en branslereturledning anordnad i anslutning till den forsta bransletanken, reglera temperaturen hos branslet i den forsta bransletanken genom all reglera flodet av branslet till den forsta bransietanken, vilken är sa ufformad aft den rymmer en mindre volym an den andra bransletanken, van i huvudmatarpumpen, vilken drivs av en frirsta elektrisk motor, är anordnad i den forsta bransletanken. According to another aspect, the invention relates to a method for regulating a branch system, which branch system comprises a first branch tank, a second branch tank, a first branch line arranged in connection with the first branch tank and the second branch tank, a second branch line 4 arranged to lead branch from the the first fuel tank for a high-pressure system, a main supply pump and a transfer pump. The main feed pump is arranged to feed fuel from the first fuel tank via the second line and the transfer pump is arranged to feed fuel from the second fuel tank to the first fuel tank via the first fuel line, the procedure includes: return pressurized fuel from the high pressure system tank to the , by directing the industry from the high pressure system via an industry return line arranged in connection with the first industry tank, regulating the temperature of the industry in the first industry tank by regulating the flow of the industry to the first industry tank, which is so shaped that it holds a smaller volume than the other the fuel tank, used in the main feed pump, which is driven by a first electric motor, is arranged in the first fuel tank.

Genom branslesystemet och forfarandet ovan astadkommer man ett flexibelt branslesystem med minskad bransleforbrukning och minskad risk far skador orsakade av overhettat bransle. Through the industry system and the procedure above, a flexible industry system is achieved with reduced industry consumption and reduced risk of damage caused by overheated industry.

Ytterligare fordelar och syften av uppfinningen beskrivs nedan i den detaljerade beskrivningen av uppfinningen. Additional advantages and objects of the invention are described below in the detailed description of the invention.

KORT BESKRIVNING AV RITNINGARNA I det faljande beskrivs, sasom ett exempel, friredragna utforingsformer av uppfinningen med hanvisning till bifogade ritningar, pa vilka: Fig. 1visar en schematisk sidovy av ett fordon, som innefattar ett branslesystem far en forbranningsmotor enligt foreliggande uppfinning, Fig. 2visar ett kopplingsschema fOr ett branslesystem enligt foreliggande uppfinning, Fig. 3visar ett kopplingsschema far ett branslesystem enligt fig. 2 kompletterat med detaljer enligt en utforingsform av foreliggande uppfinning, Fig. 4visar ett kopplingsschema for ett branslesystem enligt fig. 2 kompletterat med detaljer enligt en annan utforingsform av foreliggande uppfinning, Fig. visar ett kopplingsschema for ett branslesystem enligt fig. 2 kompletterat med detaljer enligt en ytterligare utforingsform av foreliggande uppfinning, Fig. 6visar ett flodesschema over ett ferfarande for att reglera ett branslesystem enligt foreliggande uppfinning. BRIEF DESCRIPTION OF THE DRAWINGS In the following, as an example, illustrated embodiments of the invention are described with reference to the accompanying drawings, in which: Fig. 1 shows a schematic side view of a vehicle comprising a fuel system for an internal combustion engine according to the present invention; Fig. 2 shows a wiring diagram for a branch system according to the present invention, Fig. 3 shows a wiring diagram for a branch system according to Fig. 2 supplemented with details according to an embodiment of the present invention, Fig. 4 shows a wiring diagram for a branch system according to Fig. 2 supplemented with details according to another embodiment. of the present invention, Fig. shows a wiring diagram of a branch system according to Fig. 2 supplemented with details according to a further embodiment of the present invention, Fig. 6 shows a flow chart of a method for regulating a branch system according to the present invention.

DETALJERAD BESKRIVNING AV UPPFINNINGEN Uppfinningen beskrivs nedan med hanvisning till det branslesystem och forfarande som generellt beskrevs ovan. DETAILED DESCRIPTION OF THE INVENTION The invention is described below with reference to the industry system and method generally described above.

S6som beskrevs ovan drivs huvudmatarpumpen av en forsta elektrisk motor, dvs. huvudmatarpumpen är elmotorstyrd. Huvudmatarpumpen är anordnad aft mata bransle fr6n den forsta bransietanken i branslesystemets lagtryckskrets, dvs. i kretsen som innefattar huvudmatarpumpen och bransletankarna. Genom att anvanda en elektrisk motor medges eft bredare styrintervall for pumpen an med en mekanisk pump, vilken vanligtvis drivs och styrs av forbranningsmotorn och framforallt av motorns varvtal. Den elmotorstyrda huvudmatarpumpen kan styras mot andra parametrar an motorvarvtal, till 6 exempel branslefilterigensattningsgrad och tryck i bransleledningarna. Vid olika drifttillstand med behov utanfOr vanliga specifikationer kan den elmotorstyrda huvudmatarpumpen meta mer eller mindre bransle till branslesystemet och pa sa satt kan man astadkomma en mer flexibel regiering av bransletillforseln vilket minskar parasifforluster och minskar risken for driftstorningar. Parasitforlusterna orsakas av att for mycket bransle mates in i branslesystemet pga. varvtalsstyrningen jamfort med det aktuella behovet. Lampligen är huvudmatarpumpen en lagtryckspump. As described above, the main feed pump is driven by a first electric motor, i.e. the main feed pump is electrically motorized. The main feed pump is arranged to feed fuel from the first industry tank in the industry's legal pressure circuit, ie. in the circuit which includes the main feed pump and the fuel tanks. By using an electric motor, a wider control range for the pump is allowed with a mechanical pump, which is usually driven and controlled by the internal combustion engine and above all by the engine speed. The electric motor-controlled main feed pump can be controlled against other parameters than motor speed, for example 6 industry filter replacement degree and pressure in the industry lines. In different operating conditions with needs outside the usual specifications, the electric motor-controlled main feed pump can feed more or less fuel to the fuel system and in this way a more flexible control of the fuel supply can be achieved, which reduces parasite losses and reduces the risk of operational disruptions. The parasite losses are caused by too much fuel being fed into the fuel system due to. the speed control compared to the current need. Lamply, the main feed pump is a low pressure pump.

Enligt uppfinningen anordnas den elmotorstyrda huvudmatarpumpen i den forsta bransletanken och pa sa salt skyddas huvudmatarpumpen fran omgivningen. Samtidigt kan branslet i den forsta bransletanken, vid kalla temperaturer, varms upp genom att anordna en branslereturledning for att returnera trycksatt, varmt bransle till den forsta bransletanken. Pa sa satt astadkommes ett branslesystem, som minskar risken for paraffinering av branslet. According to the invention, the electric motor-controlled main feed pump is arranged in the first fuel tank and on such salt the main feed pump is protected from the environment. At the same time, the fuel in the first fuel tank, at cold temperatures, can be heated by arranging a fuel return line to return pressurized, hot fuel to the first fuel tank. In this way, an industry system is created, which reduces the risk of paraffining the industry.

Vidare enligt uppfinningen anordnas branslereturledningen i anslutning till den fOrsta bransletanken och den forsta bransletanken kan saledes fyllas pa med bransle via branslereturledningen. Pa sa satt minskas behovet av att transferpumpen meter bransle fran den andra bransletanken till den forsta bransletanken. Pa sa satt minskas slitaget pa transferpumpen och dess livslangd 6kar. Furthermore, according to the invention, the fuel return line is arranged in connection with the first fuel tank and the first fuel tank can thus be filled with fuel via the fuel return line. This reduces the need for the transfer pump to measure fuel from the second fuel tank to the first fuel tank. In this way, the wear on the transfer pump is reduced and its service life is reduced.

Genom att den elmotorstyrda huvudmatarpumpen är anordnad i den forsta bransletanken är det aven viktigt att kunna reglera temperaturen hos branslet i den forsta bransletanken. Livslangden hos en elektrisk branslepump beror till star del pa temperaturen. All returnera trycksatt varmt bransle fran hogtryckssystemet till den forsta bransletanken kan orsaka en for hog temperatur has branslet i den forsta bransletanken, och kan darmed skada huvudmatarpumpen. For varmt bransle kan likasa paverka forbranningsmotorn negativt. Det är darfor ett ytterligare syfte med foreliggande uppfinning all 7 astadkomma ett branslesystem for en forbranningsmotor, som minskar risken for skador hos forbranningsmotorn orsakade av overhettat bransle. Because the electric motor-controlled main feed pump is arranged in the first fuel tank, it is also important to be able to regulate the temperature of the fuel in the first fuel tank. The service life of an electric fuel pump largely depends on the temperature. Any return of pressurized hot fuel from the high pressure system to the first fuel tank can cause a too high temperature has the fuel in the first fuel tank, and can thus damage the main feed pump. Too hot fuel can also adversely affect the internal combustion engine. It is therefore a further object of the present invention to provide a fuel system for an internal combustion engine which reduces the risk of damage to the internal combustion engine caused by overheated fuel.

Vidare är det eft syfte med foreliggande uppfinning att astadkomma ett branslesystem for en farbranningsmotor, som minskar risken fOr skador hos branslepumpar, filter och elektriska komponenter orsakade av overhettat bransle. Furthermore, it is an object of the present invention to provide a fuel system for an internal combustion engine which reduces the risk of damage to fuel pumps, filters and electrical components caused by overheated fuel.

Genom aft i branslesystemet anordna ett arrangemang for att reglera bransletemperaturen i den forsta bransletanken genom att reglera flodet av branslet till den forsta bransletanken astadkommes ett branslesystem for en forbranningsmotor, som minskar risken for skador hos bade forbranningsmotor och branslepumpar. Foretradesvis är temperaturen hos branslet i den forsta bransletanken 30-80°C. Flogre temperaturer kan forekomma under korta perioder, men till exempel temperaturer pa Over 100-130 °C under langre perioder, t.ex. tva timmar, kan vara skadliga. By arranging in the fuel system an arrangement for regulating the fuel temperature in the first fuel tank by regulating the flow of the fuel to the first fuel tank, a fuel system is provided for an internal combustion engine, which reduces the risk of damage to both internal combustion engine and fuel pumps. Preferably, the temperature of the fuel in the first fuel tank is 30-80 ° C. Fewer temperatures can occur for short periods, but for example temperatures of Over 100-130 ° C for longer periods, e.g. two hours, can be harmful.

Den fOrsta bransletanken rymmer en mindre volym an den andra bransletanken. Genom denna utformning , är den farsta bransletanken mindre skrymmande och lattare att anordna pa ett utrymmessnalt chassi. Vidare innebar en mindre forsta bransletank aft branslesystemet kan mata bransle till farbranningsmotorn vid en lagre bransleniva an om samma branslevolym hade tillfOrts den storre andra bransletanken. PA sa satt astadkommes eft branslesystem for en forbranningsmotor, som medger en flexibel reglering av bransletillforseln och darmed undviks driftstorningar vid lag bransleniva i bransletanken. Den forsta bransletanken kan rymma till exempelvis fran 20 till 50 liter och den andra bransletanken kan rymma 300-1000 liter. The first fuel tank holds a smaller volume than the second fuel tank. Due to this design, the first fuel tank is less bulky and easier to arrange on a space-specific chassis. Furthermore, a smaller first fuel tank of the fuel system could feed fuel to the combustion engine at a lower fuel level than if the same fuel volume had been supplied to the larger second fuel tank. PA is thus provided according to the fuel system for an internal combustion engine, which allows a flexible regulation of the fuel supply and thus avoids operational disruptions at low industry levels in the fuel tank. The first fuel tank can hold, for example, from 20 to 50 liters and the second fuel tank can hold 300-1000 liters.

Transferpumpen är foretradesvis styrd av en andra elektrisk motor. Pa sa saft astadkommes en mer effektiv och flexibel reglering av bransletillforseln till den forsta bransletanken. Transferpumpen kan ocksa vara anordnad i den forsta bransletanken, varvid utrymmet i chassit kan ytterligare sparas. 8 Foretradesvis innefattar den forsta bransletanken en temperatursensor for all bestamma temperaturen hos branslet i den forsta bransletanken. Alternativt kan man berakna temperaturen hos branslet i den forsta bransletanken utifran driftfOrhallanden hos motorn och yttertemperaturen och darmed avgOra nar temperaturen i den forsta bransletanken behover regleras. The transfer pump is preferably controlled by a second electric motor. In this way, a more efficient and flexible regulation of the supply of fuel to the first fuel tank is achieved. The transfer pump can also be arranged in the first fuel tank, whereby the space in the chassis can be further saved. Preferably, the first fuel tank comprises a temperature sensor for determining the temperature of the fuel in the first fuel tank. Alternatively, one can calculate the temperature of the fuel in the first fuel tank based on the operating conditions of the engine and the outside temperature and thus determine when the temperature in the first fuel tank needs to be regulated.

S5som ovan namndes kan bransletemperaturen i den forsta bransletanken regleras genom ett arrangemang som reglerar flodet av branslet till den forsta bransletanken. Till exempel kan flodet fr5ri hogtryckssystemet via returledningen till den forsta bransletanken och/eller flociet fran den andra bransletanken till den forsta bransletanken regleras. As mentioned above, the industry temperature in the first industry tank can be regulated by an arrangement that regulates the flow of the industry to the first industry tank. For example, the flow from the high pressure system via the return line to the first fuel tank and / or the float from the second fuel tank to the first fuel tank can be regulated.

Enligt en utforingsform av uppfinningen innefattar arrangemanget en styrenhet som styr transferpumpenmot olika parametrar. Da varmt bransle returneras fran hOgtryckssystemet, via branslereturledningen, till den fOrsta bransletanken stiger temperaturen hos branslet i den forsta bransletanken. Styrenheten styr transferpumpen s5 all den matar kontinuerligt eller satsvis bransle fran den andra bransletanken till den forsta bransletanken cla temperaturen hos branslet i den frirsta bransletanken overskrider ett forutbestamt temperaturgransvarde. Det kalla branslet fran den andra bransletanken blandas darmed med det varma branslet i den fOrsta bransletanken och overflocligt bransle transporteras via overstromningsledningen tillbaka till den andra bransletanken. Pa s5 satt kyls det varma returnerade branslet och temperaturen hos branslet i den forsta bransletanken sanks. Darmed 5stadkommes ett branslesystem for en forbranningsmotor, som minskar risken for overhettat bransle och darmed risken for skador hos bade forbranningsmotor, branslepumpar och andra hos den forsta bransletanken anordnade komponenter. According to an embodiment of the invention, the arrangement comprises a control unit which controls the transfer pump against various parameters. When hot fuel is returned from the high-pressure system, via the fuel return line, to the first fuel tank, the temperature of the fuel in the first fuel tank rises. The control unit controls the transfer pump s5 all it feeds continuously or batches of fuel from the second fuel tank to the first fuel tank cla the temperature of the fuel in the first fuel tank exceeds a predetermined temperature limit value. The cold fuel from the second fuel tank is thus mixed with the hot fuel in the first fuel tank and abundant fuel is transported via the flood line back to the second fuel tank. In this way, the hot returned fuel is cooled and the temperature of the fuel in the first fuel tank drops. This provides a fuel system for an internal combustion engine, which reduces the risk of overheated fuel and thus the risk of damage to both internal combustion engines, fuel pumps and other components arranged at the first fuel tank.

Alternativt kan transferpumpen styras att kontinuerligt eller satsvis mata bransle fran den andra bransletanken till den forsta bransletanken da 9 styrenheten nnottar en signal om att varmt bransle fran hogtryckskretsen returneras till den forsta bransletanken. Alternatively, the transfer pump can be controlled to continuously or batch feed fuel from the second fuel tank to the first fuel tank as the control unit uses a signal that hot fuel from the high pressure circuit is returned to the first fuel tank.

Alternativt kan transferpumpen styras att kontinuerligt eller satsvis mata bransle fran den andra bransletanken till den forsta bransletanken da styrenheten mottar signaler bade om bransletemperatur frail temperatursensorn och om att varmt bransle fran hogtryckskretsen returneras till den forsta bransletanken. Alternatively, the transfer pump can be controlled to continuously or batch feed fuel from the second fuel tank to the first fuel tank as the control unit receives signals both about fuel temperature from the temperature sensor and that hot fuel from the high pressure circuit is returned to the first fuel tank.

Enligt en annan ufforingsforrn av uppfinningen innefattar arrangemanget en ventil hos branslereturledningen. Ventilen uppvisar ett forsta och ett andra !age. Det forsta laget medfor att varmt bransle, som returneras fran hogtryckssystemet, leds till den forsta bransletanken via branslereturledningen och det andra laget medfor all det returnerade varma branslet leds till den andra bransletanken via en tredje bransleledning. Ventilen kan vara en aktiv eller en passiv vaxelventil. According to another embodiment of the invention, the arrangement comprises a valve of the branch return line. The valve has a first and a second! Age. The first team means that hot fuel, which is returned from the high-pressure system, is led to the first fuel tank via the industry return line and the second team means that all the returned hot fuel is led to the second fuel tank via a third industry line. The valve can be an active or a passive gear valve.

Ventilen styrs till sitt andra rage da temperaturen hos branslet i den forsta bransletanken overskrider ett forutbestamt temperaturgransvarde. Alternativt styrs ventilen till sitt andra lage cla temperaturen hos forbranningsmotorn overskrider ett forutbestamt temperaturgransvarde. Darmed astadkommes eft branslesystem for en forbranningsmotor, som minskar risken f6r overhettat bransle i den forsta bransletanken och darmed minskas risken for skador hos bade forbranningsmotor, branslepumpar och andra hos den forsta bransletanken anordnade komponenter. The valve is controlled to its second rage as the temperature of the fuel in the first fuel tank exceeds a predetermined temperature threshold value. Alternatively, the valve is controlled to its second low cla the temperature of the internal combustion engine exceeds a predetermined temperature threshold value. This provides a fuel system for an internal combustion engine, which reduces the risk of overheated fuel in the first fuel tank and thereby reduces the risk of damage to both internal combustion engines, fuel pumps and other components arranged at the first fuel tank.

I en annan ufforingsform innefattar arrangemanget en termostat branslereturledningen. Termostaten har som uppgift att reglera temperaturen i den forsta bransletanken genom all reglera floc:let av returnerat, varmt bransle, frail hogtryckssystemet, till den forsta bransletanken via branslereturledningen och/eller den andra bransletanken via en fjarde bransleledning. Termostaten är foretradesvis en mekanisk termostat, exempelvis en vaxtermostat. In another embodiment, the arrangement includes a thermostat branch return line. The thermostat has the task of regulating the temperature in the first fuel tank by regulating the flow of returned, hot fuel, frail high-pressure system, to the first fuel tank via the fuel return line and / or the second fuel tank via a fourth fuel line. The thermostat is preferably a mechanical thermostat, for example a plant thermostat.

Alternativt kan termostaten vara en elektrisk termostat. Med termostaten kan flOclet av varmt retumerat bransle, som leds genom branslereturledningen, fOrdelas sa att en del returneras till den forsta bransletanken och en del returneras via den fjarde bransleledningen till den andra bransletanken. Alternatively, the thermostat may be an electric thermostat. With the thermostat, the flock of hot-returned fuel, which is led through the fuel return line, can be distributed so that some is returned to the first fuel tank and some is returned via the fourth fuel line to the second fuel tank.

Mangden varmt bransle som returneras till den forsta bransletanken beror pa temperaturen hos branslet i den forsta bransletanken. Ju hogre temperatur hos branslet i den forsta bransletanken, desto storre flode av varmt bransle returneras via den fjarde bransleledningen till den andra bransletanken. Skulle temperaturen hos branslet i den forsta bransletanken overskrida ett fOrutbestamt temperaturgransvarde ser termostaten till all alit varmt bransle, som returneras fran hogtryckssystemet, returneras till den andra bransletanken. Pa sa satt regleras temperaturen hos branslet i den forsta bransletanken och darmed astadkommes ett branslesystem for en fOrbranningsmotor, som minskar risken for overhettat bransle och darmed risken for skador hos bade forbranningsmotor, branslepumpar och andra hos den forsta bransletanken anordnade komponenter. The amount of hot fuel returned to the first fuel tank depends on the temperature of the fuel in the first fuel tank. The higher the temperature of the industry in the first industry tank, the greater the flow of hot industry returned via the fourth industry management to the second industry tank. Should the temperature of the industry in the first industry tank exceed a predetermined temperature range value, the thermostat for all alit hot industry, which is returned from the high pressure system, is returned to the second industry tank. In this way, the temperature of the fuel in the first fuel tank is regulated and thus an fuel system is created for an internal combustion engine, which reduces the risk of overheated fuel and thus the risk of damage to both internal combustion engines, fuel pumps and other components arranged in the first fuel tank.

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

Lampligen styrs transferpumpen all mata bransle frail den andra bransletanken till den forsta bransletanken nar den med nivasensorn 11 bestamda branslenivan i den forsta bransletanken understiger ett forutbestamt varde. Lamply, the transfer pump controls all feed fuel from the second fuel tank to the first fuel tank when the fuel level determined by the level sensor 11 in the first fuel tank is less than a predetermined value.

Branslesystemet kan innefatta kombinationer av de temperaturreglerande arrangemangen namnda ovan, vilket medfor redundans om nagon komponent skulle fallera. Exempelvis kan branslesystemet innefatta bade en ventil och samtidigt styra transferpumpen aft mata bransle fran den andra bransletanken till den forsta bransletanken da den med temperatursensorn bestamda temperaturen hos branslet i den farsta bransletanken overskrider ett frirutbestamt temperaturgransvarde. The fuel system may comprise combinations of the temperature regulating arrangements mentioned above, which entails redundancy should any component fail. For example, the fuel system may comprise both a valve and at the same time control the transfer pump to supply fuel from the second fuel tank to the first fuel tank as the temperature of the fuel in the first fuel tank determined by the temperature sensor exceeds a freely determined temperature limit value.

Ett forfilter kan ocksa anordnas nedstroms transferpumpen, vilket minskar risken for driftstorningar orsakade av fororeningar i branslet. Med fororeningar avses har icke onskvarda partiklar, foremal och amnen. Transferpumpen farser den forsta bransletanken med bransle genom att mata bransle fran den andra bransletanken igenom forfiltret och via den forsta bransleledningen vidare till den farsta bransletanken. Branslet som nar den elmotorstyrda huvudmatarpumpen är pa sa satt frirfiltrerat, vilket medfor aft huvudmatarpumpen skyddas mot fororeningar pa ett fordelaktigt satt, vilket minskar risken for driftstorningar hos huvudmatarpumpen. Lamp!igen är forfiltret anordnat i den forsta bransletanken. A pre-filter can also be arranged downstream of the transfer pump, which reduces the risk of operational disturbances caused by contaminants in the industry. By contaminants is meant non-adverse particles, molds and substances. The transfer pump fills the first fuel tank with fuel by feeding fuel from the second fuel tank through the pre-filter and via the first fuel line on to the first fuel tank. The fuel that reaches the electric motor-controlled main feed pump is thus 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. Lamp! Again the pre-filter is arranged in the first fuel tank.

Ytterligare fordelar med uppfinningen framgar av foljande beskrivning med hanvisning till de bifogade ritningarna. Further advantages of the invention will become apparent from the following description taken in conjunction with the accompanying drawings.

Fig. 1 visar en schematisk sidovy av ett fordon 1, vilket fordon innefattar ett branslesystem 4 far en farbranningsmotor 2 enligt foreliggande uppfinning. Forbranningsmotorn 2 är kopplad till en vaxellada 6, som är kopplad till fordonets 1 drivhjul 8 via en transmission. Fordonet innefattar aven ett chassi . 12 Fig. 2 visar eft kopplingsschema far ett branslesystem 4 for en forbranningsmotor 2 enligt foreliggande uppfinning. Branslesystemet 4 innefattar flertalet komponenter, varav ett huvudbranslefilter 12, en hagtryckspump 14, en ackumulator i form av en s6 kallad common rail 16 samt ett insprutningssystem 18 schematiskt visat i form av en bransleinsprutare är anordnade hos forbranningsmotorn 2 (farbranningsmotorn 2 visas i fig. 1). Alternativt kan common rail 16 ersattas av en annan form av insprutningssystem 18, exempelvis piezo- eller enhetsinsprutningssystem. HOgtryckspumpen 14, common rail 16 och insprutningssystemet 18 utgar 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 transferpump 28 samt ett forfilter 30. Dessa komponenter kan vara anordnade vid fordonets chess' 10 (chassi 10 visas i fig. 1). Huvudbranslefiltret 12 är anordnat nedstronns huvudmatarpumpen 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. 1 shows a schematic side view of a vehicle 1, which vehicle comprises a fuel system 4 for a combustion engine 2 according to the present invention. The internal combustion engine 2 is connected to a gearbox 6, which is connected to the drive wheel 8 of the vehicle 1 via a transmission. The vehicle also includes a chassis. Fig. 2 shows according to the 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 (the combustion engine 2 is shown in Fig. 1). ). Alternatively, common rail 16 may be replaced by another form of injection system 18, for example piezo or unit injection systems. The high pressure pump 14, common rail 16 and the injection system 18 form components of the high pressure system 4 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 chess 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 tanker 20, 22, 24 är i sine 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 vasentligen detsamma och lika med omgivningens luftryck oberoende av hur mycket bransle som firms i respektive tank. Luftfiltret 51 forhindrar att fororeningar i omgivande luft tranger in i ventilationsledningen 50 i samband med ventilering av tankarna. All three tanks 20, 22, 24 are in their respective upper parts connected to a ventilation duct 50 which communicates with the environment via an air filter 51. The ventilation line 50 states that the pressure in the respective 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 the respective 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 sA utformad all 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 i denna utforingsform vasentligen samma volym och har ett sjalvreglerade flode mellan varandra genom ett 13 farbindelserrir 34 anordnat mellan den nedre delen hos den andra bransletanken 22 och den tredje bransletanken 24. Systemet kan innefatta bara en huvudbransletank, eller den kan innefatta flera huvudbransletankar. Transferpumpen 28 är enligt fig. 2 anordnad mellan den forsta bransletanken och den andra bransletanken 22. Huvudmatarpumpen 26 drivs av en forsta elektrisk motor M1 och är anordnad inuti den forsta bransletanken 20 och skyddas pa sa satt flan omgivningen och kyls av branslet. Transferpumpen 28 drivs av en andra elektrisk motor M2 och har som huvuduppgift att mata bransle fran den andra bransletanken 22 till den fI.5rsta bransletanken 20 via en fOrsta bransleledning 36. MeIlan den forsta bransletanken 20 och den andra bransletanken 22 ar en overstromningsledning 38 anordnad, s att bransle kan transporteras aver flan den forsta bransletanken 20 till den andra bransletanken 22 am den forsta bransletanken 20 blir overfylld. Huvudmatarpumpen 26 matar branslet flan den forsta bransletanken 20 via en andra bransleledning 40 genom huvudbranslefiltret 12 och vidare till hogtryckspumpen 14. Med Mgt tryck matas sedan branslet till common rail 16 och vidare till insprutningssystemet 18. The first fuel tank 20 is so designed that it holds 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 in this embodiment hold substantially the same volume and have a self-regulated flow between each other. through a connecting link 34 arranged between the lower part of the second fuel tank 22 and the third fuel tank 24. The system may comprise only one main fuel tank, or it may comprise several main fuel tanks. The transfer pump 28 is according to Fig. 2 arranged between the first fuel tank and the second fuel tank 22. The main feed pump 26 is driven by a first electric motor M1 and is arranged inside the first fuel tank 20 and is thus protected from the environment and cooled by the industry. 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 when the first fuel tank 20 becomes overfilled. The main feed pump 26 feeds 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 pump 14. With high pressure the fuel is then fed to the common rail 16 and on to the injection system 18.

FOrfiltret 30 är anordnat nedstroms transferpumpen 28 och är foretradelsevis ett finmaskigt, vattenavskiljande filter. I den andra bransletanken 22, uppstrams transferpumpen 28, är en grovmaskig sil 52 anordnad, igenom vilken transferpumpen 28 suger bransle. Den grovnnaskiga silen 52 filtrerar bort partiklar over en forutbestamd storlek. 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 frirsta bransletanken 20 har pa sa satt passerat bade en grovmaskig sil 52 och ett finmaskigt far-filter 30, vilket medfor att huvudmatarpumpen 26, som är anordnad i den forsta bransletanken 20 ar skyddad mot fororeningar. Genom att anordna forfiltret 30 nedstririms transferpumpen 28 trycks branslet igenom frirfiltret 30, vilket medger att branslet lattare passerar forfiltret 30 och forfiltret loper pa sa saft mindre risk att igensattas. 14 I den forsta bransletanken 20 är en forsta nivasensor 46 anordnad for aft identifiera branslenivan i den forsta bransletanken 20. Nar den med nivasensorn 46 bestamda branslenivan i den forsta bransletanken 20 understiger eft forutbestamt nivagransvarde styrs transferpumpen 28 att mata bransle fran den andra bransletanken 22 till den farsta bransletanken 20. En andra nivasensor 48 är anordnad i den andra bransletanken 22 for aft identifiera branslenivan i den andra bransletanken 22. Vidare är en temperatursensor 42 anordnad i den forsta bransletanken 20 for aft identifiera temperaturen hos branslet i den forsta bransletanken 20. 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, the transfer pump 28 is tightened, a coarse-mesh screen 52 is arranged, through which the transfer pump 28 sucks fuel. The coarse-grained screen 52 filters out particles over a predetermined size. The transfer pump 28 then pressurizes the fuel and feeds it through the pre-filter 30, via the first fuel line 36, on to the first fuel tank 20. The fuel in the first fuel tank 20 has thus passed both a coarse mesh screen 52 and a fine mesh filter 30, which means that the main feed pump 26, which is arranged in the first fuel tank 20, is protected against contamination. By arranging the pre-filter 30 downstream of the transfer pump 28, the fuel is pushed through the pre-filter 30, which allows the industry to pass the pre-filter 30 more easily and the pre-filter runs on such juice less risk of clogging. 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 with the level sensor 46 in the first fuel tank 20 falls below a predetermined level equivalent, the transfer pump 28 is controlled to supply fuel from the second fuel tank 22 to the first fuel tank 20. A second level sensor 48 is provided in the second fuel tank 22 to detect the fuel level in the second fuel tank 22. Furthermore, a temperature sensor 42 is provided in the first fuel tank 20 to detect the temperature of the fuel in the first fuel tank 20.

Fig. 3 visar ett kopplingsschema far ett branslesystem 4 enligt fig. 2 kompletterat med detaljer enligt en utforingsform av foreliggande uppfinning. Fig. 3 shows a wiring diagram of a branch system 4 according to Fig. 2 supplemented with details according to an embodiment of the present invention.

Branslesystemet 4 innefattar ett arrangemang far att reglera bransletemperaturen i den farsta bransietanken 20. Arrangemanget innefallar en styrenhet 44. Transferpumpen 28 är inrattad aft kunna styras mot olika parametrar via styrenheten 44. Transferpumpen 28, temperatursensorn 42 och nivasensorn 46 i den forsta bransletanken 20 star i forbindelse med styrenheten 44. Nar varmt bransle returneras fran hogtryckssystemet 19 genom branslereturledningen 13 till den forsta bransletanken 20 skickas en signal till styrenheten 44. Samtidigt bestams temperaturen hos branslet i den forsta bransletanken 20 med temperatursensorn 42. NJ& den med temperatursensorn 42 bestamda temperaturen hos branslet i den forsta bransletanken 20 overskrider ett forutbestamt temperaturgransvarde, styrs transferpumpen 28 att mata bransle tan den andra bransletanken 22 till den forsta bransletanken 20 oavseft branslenivan i den forsta bransletanken 20. Overflodigt bransle sonn inte ryms i den forsta bransletanken 20 leds via overstromningsledningen 38 till den andra bransletanken 22. Pa sa satt blandas det varma returnerade branslet fran hogtryckssystemet 19 med kallt bransle fran den andra bransletanken 22 och temperaturen hos branslet i den forsta bransletanken 20 uppratthalls inom ett forutbestamt temperaturintervall. The fuel system 4 comprises an arrangement for regulating the fuel temperature in the first fuel tank 20. The arrangement comprises a control unit 44. The transfer pump 28 is arranged to be controllable against various parameters via the control unit 44. The transfer pump 28, temperature sensor 42 and level sensor 46 in the first fuel tank 20 are connection to the control unit 44. When hot fuel is returned from the high pressure system 19 through the fuel return line 13 to the first fuel tank 20, a signal is sent to the control unit 44. At the same time, the temperature of the fuel in the first fuel tank 20 is determined by the temperature sensor 42. NJ & the temperature sensor 42 determined in the first fuel tank 20 exceeds a predetermined temperature threshold value, the transfer pump 28 is controlled to supply the fuel to the second fuel tank 22 to the first fuel tank 20 regardless of the fuel level in the first fuel tank 20. Excess fuel is not contained in the first fuel tank 20 l. via the overflow line 38 to the second fuel tank 22. In this way, the hot returned fuel from the high pressure system 19 is mixed with cold fuel from the second fuel tank 22 and the temperature of the fuel in the first fuel tank 20 is maintained within a predetermined temperature range.

Fig. 4 visar ett kopplingsschema far ett branslesystem 4 enligt fig. 2 konnpletterat med detaljer enligt en annan utforingsform av foreliggande uppfinning. Branslesystemet 4 innefattar ett arrangemang far att reglera bransletemperaturen i den forsta bransietanken 20. Branslesystemet 4 innefattar en ventil 54 anordnad hos branslereturledningen 13 samt en tredje bransleledning 56 anordnad i forbindelse med ventilen 54 och den andra bransletanken 22. Ventilen 54 uppvisar ett forsta och ett andra lage, van i det forsta laget medfar att varmt bransle, som returneras genom bransiereturledningen 13, returneras till den forsta bransletanken 20. Ventilens 54 andra !age medfor all det varrna branslet, som returneras genom branslereturledningen 13, returneras till den andra bransletanken 22 via den tredje bransleledningen 56. Nar den med temperatursensom 42 bestamda temperaturen hos branslet overskrider ett forutbestamt temperaturgransvarde, styrs ventilen 54 fran det forsta laget till det andra laget. Alternativt styrs ventilen 54 frail det forsta laget till det andra laget da behov av att reglera temperaturen i den forsta bransletanken 20 har beraknats utifran driftforhallanden hos hos forbranningsmotorn 2 och yttertemperaturen. Pa sa satt leds det varma returnerade branslet fran hogtryckssystemet 19 till den andra bransletanken 22 och temperaturen hos branslet i den forsta bransletanken 20 uppratthalls inom ett forutbestamt temperaturintervall. Fig. 4 shows a wiring diagram of a branch system 4 according to Fig. 2 supplemented with details according to another embodiment of the present invention. The fuel system 4 comprises an arrangement for regulating the fuel temperature in the first fuel tank 20. The fuel system 4 comprises a valve 54 arranged at the fuel return line 13 and a third fuel line 56 arranged in connection with the valve 54 and the second fuel tank 22. The valve 54 has a first and a second layer, used in the first layer causes hot fuel, which is returned through the industry return line 13, to be returned to the first fuel tank 20. The second part of the valve 54 means that all the fuel, which is returned through the industry return line 13, is returned to the second industry tank 22 via the third branch line 56. When the temperature of the branch determined by temperature sensor 42 exceeds a predetermined temperature threshold, valve 54 is controlled from the first layer to the second layer. Alternatively, the valve 54 is controlled from the first layer to the second layer as the need to regulate the temperature in the first fuel tank 20 has been calculated based on the operating conditions of the internal combustion engine 2 and the outside temperature. In this way, the hot returned fuel is led from the high pressure system 19 to the second fuel tank 22 and the temperature of the fuel in the first fuel tank 20 is maintained within a predetermined temperature range.

Fig. 5 visar ett kapplingsschema for ett branslesystem 4 enligt fig. 2 kompletterat med detaljer enligt en ytterligare utforingsform av foreliggande uppfinning. Fig. 5 shows a wiring diagram for a branch system 4 according to Fig. 2 supplemented with details according to a further embodiment of the present invention.

Branslesystemet 4 innefattar ett arrangemang for att reglera bransletemperaturen i den forsta bransletanken 20. Arrangemanget innefattar en termostat 58 anordnad hos branslereturledningen 13. En fjarde bransleledning 60 är anordnad i forbindelse med termostaten 58 och den andra bransletanken 22. Termastaten 58 reglerar flodet av varmt returnerat bransle fran hagtryckssystemet 19 till den forsta bransletanken 20 ochieller till den andra bransletanken 22 via den fjarde bransleledningen 60. Med 16 termostaten 58 kan flodet av varmt returnerat bransle, som leds genom branslereturledningen 13 fordelas, sa att en del returneras till den Mrsta bransletanken 20 och en del returneras via den fjarde bransleledningen 60 till den andra bransletanken 22. Pa sa salt uppratthalls en forutbestamd temperatur hos branslet i den Mrsta bransletanken 20. Mangden varmt bransle som returneras till den forsta bransletanken 20 beror pa temperaturen hos branslet i den forsta bransletanken 20. Ju hogre temperatur hos branslet i den forsta bransletanken 20, desto store flOde av varmt bransie returneras via den fjarde bransleledningen 60 till den andra bransletanken 22. Skulle temperaturen hos branslet i den forsta bransletanken 20 overskrida ett forutbestamt temperaturgransvarde ser termostaten 58 till aft alit varmt bransle, som returneras fran hogtryckssystemet 19, returneras till den andra bransletanken 22. Pa sa satt leds det varma returnerade branslet fran hogtryckssystemet 19 via branslereturledningen 13, vidare till den fjarde bransleledningen 60 och till den andra bransletanken 22. Det varma branslet kyls darmed av det kalla branslet i den andra bransletanken 22. Temperaturen hos branslet i den forsta bransletanken 20 upprafthalls p sa satt inom ett farutbestamt temperaturintervall. The fuel system 4 comprises an arrangement for regulating the fuel temperature in the first fuel tank 20. The arrangement comprises a thermostat 58 arranged at the fuel return line 13. A fourth fuel line 60 is arranged in connection with the thermostat 58 and the second fuel tank 22. The thermostat 58 regulates the flow of hot returned fuel from the hook pressure system 19 to the first fuel tank 20 and also to the second fuel tank 22 via the fourth fuel line 60. With the thermostat 58 the flow of hot returned fuel, which is passed through the fuel return line 13, can be distributed so that some is returned to the first fuel tank 20 and part is returned via the fourth branch line 60 to the second branch tank 22. At that salt, a predetermined temperature is maintained at the branch in the first branch tank 20. The amount of hot fuel returned to the first branch tank 20 depends on the temperature of the branch in the first branch tank 20. Ju higher temperature In the branch in the first fuel tank 20, the greater flow of hot fuel is returned via the fourth fuel line 60 to the second fuel tank 22. Should the temperature of the fuel in the first fuel tank 20 exceed a predetermined temperature threshold, the thermostat 58 sees the hot fuel industry as returned from the high pressure system 19, is returned to the second fuel tank 22. In this way, the hot returned fuel is led from the high pressure system 19 via the fuel return line 13, on to the fourth fuel line 60 and to the second fuel tank 22. The hot fuel is thus cooled by the cold fuel in the second fuel tank 22. The temperature of the fuel in the first fuel tank 20 is then maintained within a predetermined temperature range.

Fig. 6 visar ett flodesschema aver ett forfarande for att reglera branslesystemet 4 enligt foreliggande uppfinning. Forfarandet enligt uppfinningen innefattar steget (a) att returnera trycksatt bransle fran hogtryckssystemet 19 till den Mrsta bransletanken 20, genom aft leda branslet fran hogtryckssystemet 19 via en branslereturledning 13 anordnad i forbindelse med den forsta bransletanken 20. Vidare innefattar forfarandet steget (b) aft reglera temperaturen hos branslet i den forsta bransletanken 20 genom aft reglera flodet av branslet till den forsta bransietanken 20. Den forsta bransletanken 20 är sa utformad aft den rymmer en mindre volym an den andra bransletanken 22, van i huvudmatarpumpen 26, vilken drivs av en forsta elektrisk motor Ml, är anordnad i den forsta bransletanken 20. 17 Alternativt innefattar steget (b) aft med transferpumpen 28 mata bransle fran den andra bransletanken 22 till den forsta bransletanken 20 via den forsta bransleledningen 36, nar temperaturen hos branslet i den forsta bransletanken 20 averskrider ett forutbestamt temperaturgransvarde. Fig. 6 shows a flow chart of a method for controlling the branch system 4 according to the present invention. The method according to the invention comprises the step (a) of returning pressurized fuel from the high pressure system 19 to the first fuel tank 20, by directing the fuel from the high pressure system 19 via a fuel return line 13 arranged in connection with the first fuel tank 20. The method further comprises step (b) of regulating the temperature of the fuel in the first fuel tank 20 by regulating the flow of the fuel to the first fuel tank 20. The first fuel tank 20 is so designed that it holds a smaller volume than the second fuel tank 22, used in the main feed pump 26, which is driven by a first electric motor M1, is arranged in the first fuel tank 20. 17 Alternatively, step (b) aft of the transfer pump 28 comprises supplying fuel from the second fuel tank 22 to the first fuel tank 20 via the first fuel line 36, when the temperature of the fuel in the first fuel tank 20 exceeds a predetermined temperature threshold value.

Alternativt innefattar steget (b) aft via en hos branslereturledningen 13 anordnad ventil 54 styra flodet med returnerat trycksatt bransle fran hogtryckssystemet 19 via en tredje bransleledning 56 fill den andra bransletanken 22, nar temperaturen hos branslet i den forsta bransletanken overskrider ett forutbestamt temperaturgransvarde. Alternatively, step (b) of via a valve 54 provided with the fuel return line 13 comprises controlling the flow of returned pressurized fuel from the high pressure system 19 via a third fuel line 56 to the second fuel tank 22 when the temperature of the fuel in the first fuel tank exceeds a predetermined temperature threshold.

Alternativt innefattar steget (b) att via en hos branslereturiedningen 13 anordnad termostat 58 reglera floclet med returnerat trycksatt bransle fran hOgtryckssystemet 19, som returneras till den forsta bransletanken 20 via branslereturledningen 13 act-Yeller till den andra bransletanken 22 via en fjarde bransleledning 60. Alternatively, step (b) comprises controlling the float of returned pressurized fuel from the high pressure system 19 via a thermostat 58 provided to the fuel return line 13, which is returned to the first fuel tank 20 via the fuel return line 13 act-Yeller to the second fuel tank 22 via a fourth fuel line 60.

Angivna komponenter och sardrag som anges ovan kan inom ramen for uppfinningenkombinerasmellanolikaangivnautforanden. 18 The stated components and features stated above can, within the scope of the invention, be combined with the embodiments indicated above. 18

Claims (1)

Patentkrav 1. Branslesystem (4) far en forbranningsmotor (2), vilket branslesystem (4) innefattar en forsta bransletank (20), en andra bransletank (22), en forsta bransleledning (36) anordnad i fOrbindelse med den forsta bransletanken (20) och den andra bransletanken (22), en andra bransleledning (40) anordnad att leda bransle fran den forsta bransletanken (20) till ett hogtryckssystem (19), en huvudmatarpump (26) samt en transferpump (28), varvid huvudmatarpumpen (26) är anordnad att mata bransle fran den farsta bransletanken (20) via den andra ledningen (40) och transferpumpen (28) är anordnad att mata bransle ft-6n den andra bransletanken (22) till den forsta bransletanken (20) via den forsta bransleledningen (36), kannetecknat av att en farsta elektrisk motor (M1) ar anordnad aft driva huvudmatarpumpen (26), att huvudmatarpumpen (26) är anordnad i den forsta bransletanken (20), att den forsta bransletanken (20) är s6 ufformad att den rymmer en mindre volym an den andra bransletanken (22) och av att en branslereturledning (13) är anordnad att returnera trycksatt bransle fr5n hogtryckssystemet (19) till den forsta bransletanken (20), varvid branslesystemet (4) innefattar ett arrangemang far att reglera bransletemperaturen i den forsta bransletanken (20) genom att reglera fladet av branslet till den forsta bransletanken (20). 2. Branslesystem (4) enligt krav 1, kannetecknat av att arrangemanget innefattar en styrenhet (44) som styr transferpumpen (28) och nar temperaturen hos branslet i den forsta bransletanken (20) overskrider ett forutbestamt temperaturgransvarde, styr styrenheten (44) transferpumpen (28) att mata bransle fran den andra bransletanken (22) till den forsta bransletanken (20). 3. Branslesystem (4) enligt krav 1, kannetecknat av att arrangemanget innefattar en ventil (54) i branslereturledningen (13), vilken ventil (54) har ett forsta och ett andra lage, van i det forsta laget medfor att bransle leds till den forsta bransletanken via branslereturledningen (13) och van i det andra laget 19 medfor att branslet leds till den andra bransletanken (22) via en tredje bransleledning (56). 4. Branslesystem (4) enligt krav 3, kannetecknat av att nar temperaturen hos 5 branslet i den f6rsta bransletanken (20) overskrider ett forutbestarnt temperaturgransvarde, styrs ventilens (54) lage fran det forsta till det andra laget. 5. Branslesystem (4) enligt krav 1, kannetecknat av all arrangemanget innefattar en termostat (58) i branslereturledningen (13), vilken termostat (58) reglerar temperaturen hos branslet i den forsta bransletanken (20) genom att reglera floclet av retumerat bransle fran hogtryckssystemet (19) till den forsta bransletanken (20) via branslereturledningen (13) och/eller till den andra bransletanken (22) via en fjarde bransleledning (60). 6. Branslesystem (4) enligt nagot av foregaende krav, kannetecknat av all den forsta bransletanken (20) innefattar en temperatursensor (42). 7. Branslesystem (4) enligt n6got av foregaende krav, kannetecknat av att den forsta bransletanken (20) innefattar en forsta nivasensor (46) och en overstromningsledning (38) är anordnad i forbindelse med den f6rsta bransletanken (20) och den andra bransletanken (22) far att leda bransle fran den forsta bransletanken (20) till den andra bransletanken (22) nar nivan av bransle i den forsta bransletanken (20) overskrider eft forutbestamd nivagransvarde. 8. Branslesystem (4) enligt nagot av fOregaende krav, kannetecknat av att temperaturen hos branslet i den forsta bransletanken (20) är mellan cirka 3080°C. 9. Branslesystem (4) enligt n 6got av foregaende krav, kannetecknat av all transferpumpen (28) drivs av en andra elektrisk motor (M2) och varvid transferpumpen (28) är anordnad inuti den forsta bransletanken (20). 10. Forbranningsmotor (2) kannetecknad av aft den innefattar ett branslesystem (4) enligt nagot av kraven 1-9. 11. Fordon (1) kannetecknat av all det innefattar ett branslesystem (4) enligt nAgot av kraven 1-9. 12. Forfarande f6r aft reglera ett branslesystem (4), vilket branslesystem (4) innefattar en forsta bransletank (20), en andra bransletank (22), en forsta bransleledning (36) anordnad i forbindelse med den forsta bransletanken (20) och den andra bransletanken (22), en andra bransleledning anordnad (40) all leda bransle fran den forsta bransletanken (20) till ett hogtryckssystem (19), en huvudmatarpump (26) samt en transferpump (28), varvid huvudmatarpumpen (26) är anordnad aft mata bransle fran den forsta bransletanken (20) via den andra ledningen (40) och transferpumpen (26) är anordnad all mata bransle fran den andra bransletanken (22) till den forsta bransletanken (20) via den forsta bransleledningen (36), van i forfarandet innefattar stegen aft: 1. returnera trycksatt bransle fran hogtryckssystemet (19) till den forsta bransletanken (20), genom att leda branslet fran hogtryckssystemet (19) via en branslereturledning (13) anordnad i anslutning till den forsta bransletanken (20), 2. reglera temperaturen hos branslet i den forsta bransletanken (20) genom aft reglera floclet av branslet till den forsta bransletanken (20), vilken är s 'a utformad all den rymmer en mindre volym an den andra bransletanken, van i huvudmatarpumpen, vilken drivs av en forsta elektrisk motor, är anordnad i den forsta bransletanken. 21 13. Forfarande enligt krav 12, van i steget (b) innefattar aft med transferpumpen (28) mata bransle fran den andra bransletanken (22) till den forsta bransletanken (20) via den forsta bransleledningen (36) nar temperaturen hos branslet i den forsta bransletanken (20) overskrider ett forutbestamt temperaturgransvarde. 14. Forfarande enligt krav 12, van i steget (b) innefattar aft via en hos branslereturledningen (13) anordnad ventil (54) styra flodet med returnerat trycksatt bransle frAn hogtryckssystemet (19) via en tredje bransleledning (56) till den andra bransletanken (22), nar temperaturen hos branslet i den fOrsta bransletanken (20) overskrider eft forutbestamt temperaturgransvarde. 15. Forfarande enligt krav 12, van i steget (b) innefattar aft via en hos branslereturledningen (13) anordnad termostat (58) reglera flodet med returnerat trycksatt bransle fran hogtryckssystemet (19) som returneras till den forsta bransletanken (20) via branslereturledningen (13) och/eller till den andra bransletanken (22) via en fjarde bransleledning (60). 22 1/6 I co 2/6A fuel system (4) comprises 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 to direct fuel from the first fuel tank (20) to a high pressure system (19), a main feed pump (26) and a transfer pump (28), the main feed pump (26) being arranged to feed fuel from the first fuel tank (20) via the second line (40) and the transfer pump (28) is arranged to feed fuel from the second fuel tank (22) to the first fuel tank (20) via the first fuel line (36). ), characterized in that a first electric motor (M1) is arranged to drive the main feed pump (26), that the main feed pump (26) is arranged in the first fuel tank (20), that the first fuel tank (20) is shaped to accommodate a less volume than the other industry idea n (22) and in that a fuel return line (13) is arranged to return pressurized fuel from the high pressure system (19) to the first fuel tank (20), the fuel system (4) comprising an arrangement for regulating the fuel temperature in the first fuel tank (20). by adjusting the surface of the fuel to the first fuel tank (20). Fuel system (4) according to claim 1, characterized in that the arrangement comprises a control unit (44) which controls the transfer pump (28) and when the temperature of the fuel in the first fuel tank (20) exceeds a predetermined temperature limit value, the control unit (44) controls the transfer pump (44). 28) feeding fuel from the second fuel tank (22) to the first fuel tank (20). Fuel system (4) according to claim 1, characterized in that the arrangement comprises a valve (54) in the fuel return line (13), which valve (54) has a first and a second layer, used in the first layer to cause fuel to be led to it. the first fuel tank via the fuel return line (13) and the van in the second layer 19 means that the fuel is led to the second fuel tank (22) via a third fuel line (56). Fuel system (4) according to claim 3, characterized in that when the temperature of the fuel in the first fuel tank (20) exceeds a predetermined temperature limit value, the position of the valve (54) is controlled from the first to the second layer. The fuel system (4) according to claim 1, characterized by the whole arrangement comprises a thermostat (58) in the fuel return line (13), which thermostat (58) regulates the temperature of the fuel in the first fuel tank (20) by regulating the float of returned fuel from the high pressure system (19) to the first fuel tank (20) via the fuel return line (13) and / or to the second fuel tank (22) via a fourth fuel line (60). Fuel system (4) according to any one of the preceding claims, characterized in that all of the first fuel tank (20) comprises a temperature sensor (42). Fuel system (4) according to any one of the preceding claims, characterized in that the first fuel tank (20) comprises a first level sensor (46) and a flood line (38) is arranged in connection with the first fuel tank (20) and the second fuel tank ( 22) may direct fuel from the first fuel tank (20) to the second fuel tank (22) when the level of fuel in the first fuel tank (20) exceeds the predetermined level threshold. Fuel system (4) according to any one of the preceding claims, characterized in that the temperature of the fuel in the first fuel tank (20) is between about 3080 ° C. Fuel system (4) according to any one of the preceding claims, characterized in that all the transfer pump (28) is driven by a second electric motor (M2) and wherein the transfer pump (28) is arranged inside the first fuel tank (20). The internal combustion engine (2) may be characterized in that it comprises a fuel system (4) according to any one of claims 1-9. Vehicle (1) characterized by all it comprises a fuel system (4) according to any one of claims 1-9. A method for regulating a fuel system (4), which fuel system (4) comprises a first fuel tank (20), a second fuel tank (22), a first fuel line (36) arranged in connection with the first fuel tank (20) and the the second fuel tank (22), a second fuel line arranged (40) all lead fuel from the first fuel tank (20) to a high pressure system (19), a main feed pump (26) and a transfer pump (28), the main feed pump (26) being arranged aft feeding fuel from the first fuel tank (20) via the second line (40) and the transfer pump (26) is arranged to supply all fuel from the second fuel tank (22) to the first fuel tank (20) via the first fuel line (36), the method comprises the steps of: 1. returning pressurized fuel from the high pressure system (19) to the first fuel tank (20), by directing the fuel from the high pressure system (19) via a fuel return line (13) arranged in connection with the first fuel tank (20), 2 . regulating the temperature of the fuel in the first fuel tank (20) by aft regulating the floc of the fuel to the first fuel tank (20), which is so designed that it holds a smaller volume than the second fuel tank, used in the main feed pump, which is driven by a first electric motor, is arranged in the first fuel tank. The method of claim 12, comprising of step (b) comprising using the transfer pump (28) to supply fuel from the second fuel tank (22) to the first fuel tank (20) via the first fuel line (36) when the temperature of the fuel in the the first fuel tank (20) exceeds a predetermined temperature threshold value. A method according to claim 12, comprising in step (b) comprising directing via a valve (54) arranged at the fuel return line (13) controlling the flow of returned pressurized fuel from the high pressure system (19) via a third fuel line (56) to the second fuel tank (56). 22), when the temperature of the industry in the first industry tank (20) exceeds the predetermined temperature limit value. The method of claim 12, comprising in step (b) comprising controlling via a thermostat return line (13) a thermostat (58) controlling the flow of returned pressurized fuel from the high pressure system (19) returned to the first fuel tank (20) via the branch return line ( 13) and / or to the second fuel tank (22) via a fourth fuel line (60). 22 1/6 I co 2/6 1. Cr 3/6 4/6 5/6 6/61. Cr 3/6 4/6 5/6 6/6
SE1350521A 2013-04-29 2013-04-29 Combustion engine fuel system, internal combustion engine with such a fuel system, vehicles with such a fuel system and a method for regulating a fuel system SE537848C2 (en)

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SE1350521A SE537848C2 (en) 2013-04-29 2013-04-29 Combustion engine fuel system, internal combustion engine with such a fuel system, vehicles with such a fuel system and a method for regulating a fuel system
PCT/SE2014/050501 WO2014178776A1 (en) 2013-04-29 2014-04-25 Fuel system for combustion engine
EP14791373.5A EP2992203B1 (en) 2013-04-29 2014-04-25 Fuel system for combustion engine
BR112015025090-4A BR112015025090B1 (en) 2013-04-29 2014-04-25 FUEL SYSTEM FOR COMBUSTION ENGINE, COMBUSTION ENGINE, VEHICLE AND METHOD FOR CONTROLLING A FUEL SYSTEM

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Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR849423A (en) * 1938-09-02 1939-11-23 Aircraft fuel supply device
EP0043283A3 (en) * 1980-07-01 1982-07-14 Cashmore, Peter Roseby Monitoring fuel consumption of internal combustion engines
US5050567A (en) * 1991-02-01 1991-09-24 Aisan Kogyo Kabushiki Kaisha Fuel supply system
US5197443A (en) * 1991-06-13 1993-03-30 Parker Hannifin Corporation Fuel system for diesel truck
DE10010517A1 (en) * 2000-03-07 2001-09-13 Volkswagen Ag Fuel supply system for internal combustion engines with fuel injection, preferably for use in cars has between low and high pressure pumps, reservoir fed from low pressure pump and connected via return line to tank
SE522425C2 (en) * 2001-05-08 2004-02-10 Scania Cv Ab Fuel transport device for internal combustion engine
JP4220352B2 (en) * 2003-11-04 2009-02-04 日野自動車株式会社 Fuel supply system for liquefied gas engine
JP2010121528A (en) * 2008-11-19 2010-06-03 Toyota Motor Corp Fuel supply device for internal combustion engine
US9776507B2 (en) * 2010-12-14 2017-10-03 GM Global Technology Operations LLC Temperature based fuel management in a vehicle fuel system
WO2014057093A1 (en) * 2012-10-13 2014-04-17 Volkswagen Ag Fuel supply device
SE537007C2 (en) * 2013-03-22 2014-12-02 Scania Cv Ab Combustion engine fuel system and a method for regulating a fuel system
SE537005C2 (en) * 2013-03-22 2014-12-02 Scania Cv Ab Combustion engine fuel system and a method for regulating a fuel system
SE537004C2 (en) * 2013-03-22 2014-12-02 Scania Cv Ab Combustion engine fuel system and method for handling water contained in fuel in a fuel system
SE537006C2 (en) * 2013-03-22 2014-12-02 Scania Cv Ab Combustion engine fuel system and a method of replacing filter elements in a fuel system
SE537002C2 (en) * 2013-03-22 2014-11-25 Scania Cv Ab Combustion engine fuel system and a method for regulating a fuel system

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BR112015025090B1 (en) 2021-11-23
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