DE3800585A1 - Device for the alternative operation of a diesel internal combustion engine with diesel oil and rape seed oil - Google Patents

Device for the alternative operation of a diesel internal combustion engine with diesel oil and rape seed oil

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Publication number
DE3800585A1
DE3800585A1 DE3800585A DE3800585A DE3800585A1 DE 3800585 A1 DE3800585 A1 DE 3800585A1 DE 3800585 A DE3800585 A DE 3800585A DE 3800585 A DE3800585 A DE 3800585A DE 3800585 A1 DE3800585 A1 DE 3800585A1
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Germany
Prior art keywords
fuel
pressure
oil
diesel
low
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
DE3800585A
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German (de)
Inventor
Gerhard Finsterwalder
Hermann-Josef Komp
Cornelis Dr Havenith
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kloeckner Humboldt Deutz AG
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Kloeckner Humboldt Deutz AG
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Priority to DE3800585A priority Critical patent/DE3800585A1/en
Publication of DE3800585A1 publication Critical patent/DE3800585A1/en
Withdrawn legal-status Critical Current

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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
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0064—Layout or arrangement of systems for feeding fuel for engines being fed with multiple fuels or fuels having special properties, e.g. bio-fuels; varying the fuel composition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B69/00—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types
    • F02B69/02—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0602—Control of components of the fuel supply system
    • F02D19/0605—Control of components of the fuel supply system to adjust the fuel pressure or temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0602—Control of components of the fuel supply system
    • F02D19/0613—Switch-over from one fuel to another
    • F02D19/0615—Switch-over from one fuel to another being initiated by automatic means, e.g. based on engine or vehicle operating conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0649—Liquid fuels having different boiling temperatures, volatilities, densities, viscosities, cetane or octane numbers
    • F02D19/0652—Biofuels, e.g. plant oils
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0684—High pressure fuel injection systems; Details on pumps, rails or the arrangement of valves in the fuel supply and return systems
    • 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
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2201/00—Fuels
    • F02B2201/06—Dual fuel applications
    • F02B2201/062—Liquid and liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N19/00—Starting aids for combustion engines, not otherwise provided for
    • F02N19/001—Arrangements thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Biotechnology (AREA)
  • Sustainable Energy (AREA)
  • Sustainable Development (AREA)
  • Botany (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

One version of a rape seed oil tractor put into practice is awkward to operate and is not suitable for continuous operation with diesel oil. The new version is intended to permit continuous operation with rape seed and diesel oil and to be easy to operate. This is achieved by separate feed and return line for the two fuels, which are fed at a different pressure level of the injection pump. The invention is suitable for vegetable oil engines, which are intended to be used at temperatures of less than 10@C. <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zum alternativen Betreiben einer Dieselbrennkraftmaschine mit dünnflüssigem Kraftstoff, insbesondere Dieselöl, und dickflüssigem Kraftstoff, insbesondere Rapsöl, nach dem Oberbegriff des Anspruch 1.The invention relates to an alternative device Operating a diesel engine with a low viscosity Fuel, especially diesel oil, and viscous Fuel, especially rapeseed oil, according to the generic term of Claim 1.

Brennkraftmaschine, die mit Rapsöl betrieben werden, starten bei niedrigen Temperaturen schlecht, da Rapsöl dann zähflüssig wird und dadurch die zur Gemischbildung im Brennraum erforderliche Zerstäubung des Kraftstoffs nicht mehr möglich ist.Internal combustion engine operated with rapeseed oil, start poorly at low temperatures because of rapeseed oil then becomes viscous and thereby the mixture formation in No need to atomize the fuel in the combustion chamber is more possible.

Diese Schwierigkeiten kann man dadurch beheben, daß der Motor bei Start und Warmlauf mit Dieselöl betrieben wird und anschließend auf Rapsöl umgeschaltet wird. Das Rapsöl erwärmt sich dann an den heißen Einspritzdüsen, wodurch es dünnflüssig und dadurch gut zerstäubbar wird.These difficulties can be remedied by the fact that Engine is operated with diesel oil at start-up and warm-up and then switch to rapeseed oil. The rapeseed oil then heats up on the hot injectors, causing it becomes thin and therefore easy to atomize.

Bei einem ausgeführten Traktor für Diesel- und Rapsölbe­ trieb wird das Umschalten von einer auf die andere Be­ triebsart von Hand bewerkstelligt. Das ist umständlich, da der Fahrer seine Kabine verlassen muß. Außerdem fehlt bei diesem Traktor eine spezielle Kraftstoffrückleitung in den Dieseltank. Dadurch ist ein Dauerbetrieb mit Dieselöl, wie er bei Temperaturen unterhalb der Fördergrenze des Rapsöls und bei Rapsölmangel notwendig werden kann, nicht möglich.On a running tractor for diesel and rapeseed oil is switched from one to the other mode of operation accomplished by hand. This is cumbersome because the driver has to leave his cabin. Also missing from  a special fuel return line in the tractor Diesel tank. This makes continuous operation with diesel oil like at temperatures below the rapeseed oil production limit and may become necessary in the event of a lack of rapeseed oil.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zum wahlweisen Dauerbetrieb mit Raps und Dieselöl zu schaf­ fen, bei der ein Vermischen beider Kraftstoffe weitgehend vermieden wird, die einfach und robust aufgebaut ist, sich bequem bedienen läßt und unkompliziert nachgerüstet wer­ den kann.The invention has for its object a device for optional continuous operation with rapeseed and diesel oil fen, where a mixing of both fuels largely is avoided, which is simple and robust, itself easy to use and easy to retrofit that can.

Diese Aufgabe wird durch den kennzeichnenden Teil des An­ spruchs 1 gelöst.This task is performed by the characteristic part of the To spell 1 solved.

Die Anordnung bietet den Vorteil eines sehr kurzen gemein­ samen Strömungsweges für beide Kraftstoffarten. Dadurch tritt beim Umschalten der Kraftstoffart nur eine geringfü­ gige Vermischung zwischen den verschiedenen Kraftstoff­ arten auf.The arrangement offers the advantage of a very short common same flow path for both types of fuel. Thereby occurs only slightly when switching the fuel type common mix between the different fuel species.

Das je nach Betriebsart unterschiedliche Kraftstoffdruck­ niveau im Niederdrucksystem der Einspritzanlage gestattet auf einfache Weise durch Verwenden von Rückschlagventilen und nur eines Elektromagnetventils eine Umstellung der Be­ triebsart.The different fuel pressure depending on the operating mode level in the low pressure system of the injection system permitted easily by using check valves and only one solenoid valve a conversion of the loading drive type.

Nach Anspruch 2 ist der erhöhte Kraftstoffvordruck vor­ teilhaft im Dieselölbetrieb, der nach Anspruch 3 erfin­ dungsgemäß durch eine elektrische Tankförderpumpe bewerk­ stelligt wird, die in der Ausbildung nach Anspruch 4 für Dauerbetrieb mittels Rastschalter einschaltbar ist. Diese Lösung bietet den Vorteil einer einfachen und bequemen Um­ schaltung der Betriebsart. According to claim 2, the increased fuel pressure is before partial in the diesel oil operation, which invented according to claim 3 according to bewerk by an electric tank feed pump is provided in the training according to claim 4 for Continuous operation can be switched on using the latching switch. These Solution offers the advantage of a simple and convenient order switching the operating mode.  

Eine vorteilhafte Weiterbildung der Erfindung nach An­ spruch 5 bewirkt eine Steuerung der Warmlaufzeit im Die­ selölbetrieb in Abhängigkeit von der Motortemperatur. Auf diese Weise wird die für den Rapsölbetrieb erforderliche Vorwärmzeit minimiert.An advantageous development of the invention according to saying 5 controls the warm-up time in the die Oil operation depending on the engine temperature. On in this way it becomes necessary for the operation of rapeseed oil Preheating time minimized.

Die in den Ansprüchen 6 und 7 beschriebene Festlegung der Höhe des Druckniveaus im Kraftstoffniederdrucksystem bie­ tet den Vorteil besonderer Einfachheit und geringen elek­ trischen Aufwandes, wie er besonders bei landwirtschaft­ lichen Maschinen wünschenswert ist.The definition of the described in claims 6 and 7 Level of pressure in the low-pressure fuel system bie The advantage of special simplicity and low elec trical effort, as it is especially in agriculture machines is desirable.

In besonderer Weiterbildung ist nach Anspruch 8 der Rück­ lauf des dickflüssigen Kraftstoffes oberhalb der Zylinder­ köpfe zwischen Wirbelkammer und Einspritzventil verlegt. Dabei ist der Rücklauf vorteilhaft am Zylinderkopf, insbe­ sondere der Wandung der Wirbelkammer, anliegend befestigt. Auf diese Weise wird das im Rücklauf befindliche kalte Rapsöl erwärmt und warm dem Rapsöltank zugeführt, so daß dort - insbesondere im Bereich des Sauganschlusses - rela­ tiv rasch eine für eine Förderung ausreichende Viskosität des Rapsöls erzielt ist. Die besondere Führung des Rück­ laufs zwischen dem Einspritzventil und der Wirbelkammer bzw. oberhalb der Wirbelkammer gewährleistet bereits nach wenigen Arbeitszyklen eine rasche Erwärmung des Rapsöls, da insbesondere die Wirbelkammer und ihr umliegender Be­ reich bereits nach wenigen Betriebszyklen stark erhitzt ist.In a further development, according to claim 8, the re the thick fuel runs above the cylinders heads between the swirl chamber and the injection valve. The return is advantageous on the cylinder head, esp special the wall of the vortex chamber, attached tightly. In this way, the cold is in the return Rapeseed oil warmed and fed warm to the rapeseed oil tank so that there - especially in the area of the suction connection - rela tiv quickly a sufficient viscosity for a promotion of the rapeseed oil is achieved. The special management of the re runs between the injection valve and the swirl chamber or above the swirl chamber already guarantees after rapid warming of the rapeseed oil within a few working cycles, since in particular the vortex chamber and its surrounding Be richly heated after just a few operating cycles is.

Weitere Mermale der Erfindung ergeben sich aus der Zeich­ nung, in der ein Ausführungsbeispiel der erfindungsgemäßen Vorrichtung schematisch dargestellt ist. Further features of the invention result from the drawing tion in which an embodiment of the invention Device is shown schematically.  

In der schematischen Zeichnung ist eine mehrzylindrige Dieselbrennkraftmaschine 1 gezeigt, die über eine Ein­ spritzpumpe 2 mit Kraftstoff versorgt ist. Die einzelnen Hochdruckleitungen a bis d der Einspritzpumpe 2 sind den in den Zylinderköpfen 3 bis 6 angeordneten Einspritzventi­ len A bis D zugeführt. Die Leckölleitungen der Enspritz­ ventile A bis D münden in eine Rücklaufleitung 7, die in einen Tank 8 führt, der dickflüssigen Kraftstoff, insbe­ sondere Rapsöl, enthält. Der Tank 8 ist über eine elektri­ sche Heizvorrichtung 9 vom Stromnetz aus beheizbar.In the schematic drawing, a multi-cylinder diesel internal combustion engine 1 is shown, which is supplied with fuel via an injection pump 2 . The individual high-pressure lines a to d of the injection pump 2 are supplied to the injection valves A to D arranged in the cylinder heads 3 to 6 . The leak oil lines of the injection valves A to D open into a return line 7 , which leads into a tank 8 , which contains viscous fuel, in particular special rapeseed oil. The tank 8 is heated via an electrical heating device 9 from the power supply.

Die Einspritzpumpe 2 weist einen Sauganschluß 10 auf, der über die Zuführleitung 11 mit einem Tank 12 verbunden ist, der den dünnflüssigen Kraftstoff, insbesondere Dieselöl, enthält. Eine elektrische Kraftstoff-Förderpumpe 13, ins­ besondere eine Kolbenpumpe, mündet mit ihrem Sauganschluß 14 im Dieseltank 12, während sich auf ihrer Druckseite ein Rückschlagventil 15 befindet, das über ein Dieselkraft­ stoff-Filter 16 mit dem Sauganschluß 10 verbunden ist.The injection pump 2 has a suction connection 10 which is connected via the feed line 11 to a tank 12 which contains the low-viscosity fuel, in particular diesel oil. An electric fuel delivery pump 13 , in particular a piston pump, opens with its suction port 14 in the diesel tank 12 , while on its pressure side there is a check valve 15 which is connected to the suction port 10 via a diesel fuel filter 16 .

Der Sauganschluß 10 ist ferner über die Zuführleitung 18 mit dem Rapsöltank 8 verbunden. In der Zuführleitung 18 ist eine vom Verbrennungsmotor angetriebene Kolbenförder­ pumpe 19 vorgesehen, deren Förderdruck auf vorzugsweise 2 bar eingestellt ist. Ihr Sauganschluß 20 mündet im Rapsöl­ tank 8. Auf der Druckseite der Kolbenpumpe 19 befindet sich ein Rückschlagventil 17, das über ein Rapsölfilter 23 und die Leitung 18 mit dem Sauganschluß 10 der Einspritz­ pumpe 2 verbunden ist.The suction port 10 is also connected to the rapeseed oil tank 8 via the feed line 18 . In the feed line 18 , a piston pump 19 driven by the internal combustion engine is provided, the delivery pressure of which is preferably set to 2 bar. Your suction port 20 opens into the rapeseed oil tank 8 . On the pressure side of the piston pump 19 there is a check valve 17 , which is connected via a rapeseed oil filter 23 and the line 18 to the suction port 10 of the injection pump 2 .

Der Rücklaufanschluß 24 der Einspritzpumpe 2 ist über ein Elektromagnetventil 28, das einen Druckabfall von vorzugs­ weise dp = 1,5 bar erzeugt, mit dem Rücklauf 7 verbunden, der oberhalb der Zylinderköpfe zwischen den Wirbelkammern und Einspritzventilen vorzugsweise am Zylinderkopf be­ festigt, wärmeaufnehmend längs der Brennkraftmaschine 1 geführt ist. Der Rücklauf 7 mündet nach Aufnahme des Leck­ öles der Einspritzdüsen A, B, C, D in den Rapsöltank 8, vorzugsweise im Bereich des Sauganschlusses 20. Hierdurch wird sichergestellt, daß rückgeflossenes, erwärmtes Rapsöl von der Kolbenpumpe 19 angesaugt wird. Durch eine Wärme­ isolation 21 des Rapsöltanks 8 wird dessen Erwärmung bzw. Warmhaltung gefördert.The return port 24 of the injection pump 2 is connected via an electromagnetic valve 28 , which produces a pressure drop of preferably dp = 1.5 bar, with the return 7 , which preferably fastens above the cylinder heads between the swirl chambers and injection valves on the cylinder head, heat-absorbing along the Internal combustion engine 1 is guided. After receiving the leak oil from the injection nozzles A, B, C, D , the return 7 opens into the rapeseed oil tank 8 , preferably in the area of the suction connection 20 . This ensures that refluxed, heated rapeseed oil is sucked in by the piston pump 19 . Thermal insulation 21 of the rapeseed oil tank 8 promotes its warming or keeping warm.

An den Rücklaufanschluß 24 ist ferner zur Kontrolle des Drucks im Saugraum der Einspritzpumpe 2 ein Manometer 26 angeschlossen, dem eine bei Unterschreiten eines Druck­ grenzwertes ansprechende Anzeigevorrichtung, z. B. eine Glühlampe, zugeordnet sein kann. Auf diese Weise wird die Fördergrenze des Rapsöls angezeigt. Ferner ist der Rück­ laufanschluß 24 über die Rücklaufleitung 27 mit dem Dieseltank 12 verbunden. In der Rücklaufleitung 27 ist ein Druckhalteventil 25 angeordnet, das bei einem Druck von vorzugsweise 2,5 bar öffnet und damit bei geschlossenem Magnetventil 28 das Druck-Niveau der Niederdruckseite im Dieselbetrieb festlegt. Da dieses Druckniveau höher liegt als der Förderdruck der Rapsölpumpe 19 bleibt deren Rück­ schlagventil 17 bei Dieselbetrieb geschlossen, so daß bei laufender elektrischer Tankförderpumpe 13 kein Rapsöl in den Dieselölkreislauf gelangen kann und umgekehrt.At the return port 24 is also connected to control the pressure in the suction chamber of the injection pump 2, a manometer 26 , which is a responsive when the pressure falls below a display device, for. B. an incandescent lamp can be assigned. In this way, the production limit of the rapeseed oil is displayed. Furthermore, the return connection 24 is connected via the return line 27 to the diesel tank 12 . Arranged in the return line 27 is a pressure-maintaining valve 25 which opens at a pressure of preferably 2.5 bar and thus defines the pressure level of the low-pressure side in diesel mode when the solenoid valve 28 is closed. Since this pressure level is higher than the delivery pressure of the rapeseed oil pump 19 , its return check valve 17 remains closed during diesel operation, so that no rapeseed oil can get into the diesel oil circuit when the electric tank feed pump 13 is running and vice versa.

Über die elektrische Leitung 35 liegt das Magnetventil 28 zusammen mit der elektrischen Zuleitung 22 der elektri­ schen Kraftstoff-Förderpumpe 13 an einem Rastschalter 30, in dessen Schließstellung eine stromführende Verbindung über den Betriebsanlaßschalter 33 mit der Spannungsquelle 31 geschaffen ist. Ist der Rastschalter 30 gedrückt, läuft die elektrische Kraftstoff-Förderpumpe 13 an und das Mag­ netventil 28 ist geschlossen. Das Dieselöl wird unter dem Druck, der durch das Druckhalteventil 25 vorgegeben ist, der Einspritzpumpe 2 zugeführt, so daß der Motor im Diesel­ ölbetrieb läuft.Via the electrical line 35 , the solenoid valve 28 is located together with the electrical supply line 22 of the electrical fuel delivery pump 13 on a latching switch 30 , in the closed position of which a current-carrying connection via the operating starter switch 33 to the voltage source 31 is created. If the latching switch 30 is pressed, the electric fuel delivery pump 13 starts and the solenoid valve 28 is closed. The diesel oil is fed to the injection pump 2 under the pressure which is predetermined by the pressure-maintaining valve 25 , so that the engine runs in diesel oil mode.

Wird der Rastschalter 30 auf "aus" gedrückt, steht die Kraftstoff-Förderpumpe 13 still und das Elektromagnet­ ventil 28 ist stromlos offen. Dann übernimmt die vom Motor angetriebene Kraftstoff-Förderpumpe 19 die Versorgung mit Rapsöl, die unter dem Druck, der durch den Druckabfall des offenen Magnetventils 28 gegeben ist, die Einspritzpumpe 2 versorgt. Dabei wird das Rückschlagventil 15 an der elek­ trischen Förderpumpe 13 durch den Förderdruck des Rapsöls geschlossen und das Druckhalteventil 25 kann aufgrund sei­ nes Öffnungsruckes von pö = 2,5 bar, der über dem Förder­ druck des Rapsöls liegt, nicht öffnen, so daß kein Rapsöl in den Dieselkreis gelangen kann.If the detent switch 30 is pressed to "off", the fuel delivery pump 13 is stopped and the solenoid valve 28 is open when de-energized. Then the fuel-driven pump 19 driven by the engine takes over the supply of rapeseed oil, which supplies the injection pump 2 under the pressure which is given by the pressure drop of the open solenoid valve 28 . The check valve 15 on the elec tric feed pump 13 is closed by the delivery pressure of the rapeseed oil and the pressure control valve 25 cannot open due to its opening pressure of pö = 2.5 bar, which is above the delivery pressure of the rapeseed oil, so that no rapeseed oil can get into the diesel circuit.

Da sowohl im Rapsöl- als auch im Dieselölbetrieb eine kla­ re Trennung der Kraftstoffkreisläufe vorliegt, ist der Mo­ tor bei beiden Kraftstoffen für Dauerbetrieb geeignet.Since both in rapeseed oil and diesel oil operation a class If the fuel circuits are separated, the Mo Suitable for continuous operation with both fuels.

Ferner wird die elektrische Kraftstoffpumpe 13 und das Elektromagnetventil 28 vorteilhaft über einen Temperatur­ schalter 29 angesteuert, der über die Leitung 34 und den Betriebsschalter 33 mit der Stromquelle 31 und über die Leitung 32 mit der Stromzuführung 22 verbunden ist.Furthermore, the electric fuel pump 13 and the solenoid valve 28 is advantageously controlled via a temperature switch 29 , which is connected via the line 34 and the operating switch 33 to the power source 31 and via the line 32 to the power supply 22 .

Der Betriebsanlaßschalter 33 dient zum Betätigen des nicht näher gezeigten Anlassers der Brennkraftmaschine 1 und zur Freigabe der Stromquelle 31 für den Dieselölbetrieb. Für den als angestrebten Normalfall betrachteten Rapsölbetrieb benötigt der Motor keinerlei Strom, da die elektrische Kraftstoff-Förderpumpe 13 stillsteht und das Elektromag­ netventil 28 stromlos offensteht. Dadurch ist der Motor­ aufbau besonders einfach und robust.The operating starter switch 33 serves to actuate the starter of the internal combustion engine 1 ( not shown in more detail ) and to release the power source 31 for diesel oil operation. For the rapeseed oil operation considered as the intended normal case, the motor does not require any electricity, since the electric fuel delivery pump 13 is at a standstill and the solenoid valve 28 is open when de-energized. This makes the engine construction particularly simple and robust.

Für den Fall eines zu erwartenden Kaltstartes wird vor dem Abstellen der Brennkraftmaschine 1 der Rastschalter 30 ge­ drückt, wodurch die Einspritzpumpe 2 über den Sauganschluß 10 von der elektrischen Kraftstoff-Förderpumpe 13 sofort Dieselöl erhält. Nach ca. 30 Sek. Motorlaufzeit im niedri­ gen Leerlauf ist auch das gesamte Hochdruckkraftstoff­ system bis zur Einspritzdüse mit Dieselöl gefüllt, so daß der nächste Start auf alle Fälle mit Dieselöl erfolgt.In the event of an expected cold start, the detent switch 30 is pressed before the internal combustion engine 1 is switched off, as a result of which the injection pump 2 immediately receives diesel oil via the suction connection 10 from the electric fuel delivery pump 13 . After approx. 30 seconds of engine running in low idling conditions, the entire high-pressure fuel system is filled with diesel oil up to the injection nozzle, so that the next start will definitely take place with diesel oil.

Beim Kaltstart selbst wird die Kraftstoff-Förderpumpe 13 durch den Temperaturschalter 29 eingeschaltet, so daß der Rastschalter ausgeschaltet bleiben kann. Der Temperatur­ schalter 29 schaltet die Kraftstoff-Förderpumpe 13 automa­ tisch ab, wenn die zum unterbrechungslosen Übergang auf Rapsölbetrieb erforderliche Motortemperatur erreicht ist. Somit beschränkt sich die kraftstoffseitige Bedienung der Brennkraftmaschine 1 für den Fall, daß ein Wiederstart un­ ter Kaltmotorbedingungen erwartet wrid, auf das "Ein-" und "Aus"-drücken des Rastschalters 30 vor dem Abstellen der Brennkraftmaschine.During the cold start itself, the fuel delivery pump 13 is switched on by the temperature switch 29 , so that the latching switch can remain switched off. The temperature switch 29 automatically switches off the fuel feed pump 13 when the engine temperature required for the uninterrupted transition to rapeseed oil operation has been reached. Thus, the fuel-side operation of the internal combustion engine 1 in the event that a restart is expected under cold engine conditions is limited to the "on" and "off" pressing of the latching switch 30 before the internal combustion engine is switched off.

Aufgrund des einfachen Aufbaus des Kraftstoffsystems, des­ sen Hochdruckteil (Einspritzpumpe, -düse, -leitungen) ge­ genüber der Serienausführung für Dieselölbetrieb unverän­ dert bleibt, ist eine Nachrüstung des Motors bzw. Fahrzeu­ ges auf Rapsölbetrieb unproblematisch.Due to the simple structure of the fuel system, the high pressure part (injection pump, nozzle, pipes) unchanged compared to the series version for diesel oil operation What remains is retrofitting the engine or vehicle problems with rapeseed oil operation.

Claims (8)

1. Vorrichtung zum alternativen Betreiben einer Die­ selbrennkraftmaschine mit dünnflüssigem Kraftstoff, insbe­ sondere Dieselöl, und dickflüssigem Kraftstoff, insbeson­ dere Rapsöl, mit einer zum Fördern des Kraftstoffs zu den Einspritzdüsen (A, B, C, D) angeordneten Einspritzpumpe (2), deren Sauganschluß (10) mit Kraftstoff gespeist ist, und aus deren Überströmöffnung (24) Kraftstoff abfließt, dadurch gekennzeichnet, daß dem einzigen Sauganschluß (10) sowohl der dünnflüssige wie der dickflüssige Kraftstoff getrennt zugeführt ist, die beiden Kraftstoffe unmittelbar nach der Überströmöffnung (24) über getrennte Rückläufe abfließen, und daß der eine Kraftstoff in bestimmbaren Zeiträumen unter einem höheren Druck zugeführt ist als der andere Kraftstoff.1. Device for alternative operation of a self-powered engine with low-viscosity fuel, in particular special diesel oil, and viscous fuel, in particular rapeseed oil, with an injection pump ( 2 ) arranged to convey the fuel to the injection nozzles (A, B, C, D ), the Suction port ( 10 ) is fed with fuel and fuel flows out of its overflow opening ( 24 ), characterized in that both the low-viscosity and the viscous fuel are fed separately to the single suction connection ( 10 ), the two fuels immediately after the overflow opening ( 24 ) drain off via separate returns, and that one fuel is supplied at a higher pressure than the other fuel in determinable periods of time. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der dünnflüssige Kraftstoff in bestimmbaren Zeiträumen unter einem höheren Druck zuge­ führt ist als der dickflüssige Kraftstoff. 2. Device according to claim 1, characterized in that the low viscosity fuel in determinable periods under a higher pressure leads as the viscous fuel.   3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der dünnflüssige Kraftstoff über eine elektrich betriebene Kraftstoffpumpe (13) dem Sauganschluß (10) zugeführt ist.3. Apparatus according to claim 1 or 2, characterized in that the low-viscosity fuel is supplied to the suction port ( 10 ) via an electrically operated fuel pump ( 13 ). 4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die elektrische Kraftstoff­ pumpe (13) über einen manuellen Rastschalter (30) elek­ trisch einschaltbar ist.4. Device according to one of claims 1 to 3, characterized in that the electric fuel pump ( 13 ) via a manual latching switch ( 30 ) can be switched on electrically. 5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die elektrische Kraftstoff­ pumpe (13) über einen Temperaturschalter (29) an der Brennkraftmaschine (1) mit der Spannungsquelle (31) ver­ bindbar ist.5. Device according to one of claims 1 to 4, characterized in that the electric fuel pump ( 13 ) via a temperature switch ( 29 ) on the internal combustion engine ( 1 ) with the voltage source ( 31 ) is ver bindable. 6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Kraftstoffdruck im Betrieb mit dünnflüssigem Kraftstoff bei einem durch Stromfluß ge­ schlossenen Magnetventil (28) durch ein Druckhalteventil (25) bestimmt ist.6. Device according to one of claims 1 to 5, characterized in that the fuel pressure in operation with low-viscosity fuel at a closed by ge current flow solenoid valve ( 28 ) is determined by a pressure maintaining valve ( 25 ). 7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Kraftstoffdruck bei Be­ trieb mit dickflüssigem Kraftstoff durch den Druckabfall im stromlos offenen Magnetventil (28) bestimmt ist.7. Device according to one of claims 1 to 6, characterized in that the fuel pressure when Be operated with viscous fuel by the pressure drop in the normally open solenoid valve ( 28 ) is determined. 8. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß der Rücklauf (7) des dickflüs­ sigeren Kraftsoffs am Zylinderkopf (3, 4, 5, 6) insbeson­ dere der Wirbelkammer (3.1, 4.1, 5.1, 6.1) anliegend be­ festigt ist.8. Device according to one of claims 1 to 7, characterized in that the return ( 7 ) of the thick-flowing sigeren fuel on the cylinder head ( 3, 4, 5, 6 ) in particular the vortex chamber ( 3.1, 4.1, 5.1, 6.1 ) be attached is consolidated.
DE3800585A 1987-01-13 1988-01-12 Device for the alternative operation of a diesel internal combustion engine with diesel oil and rape seed oil Withdrawn DE3800585A1 (en)

Priority Applications (1)

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DE3800585A DE3800585A1 (en) 1987-01-13 1988-01-12 Device for the alternative operation of a diesel internal combustion engine with diesel oil and rape seed oil

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DE3700786 1987-01-13
DE3800585A DE3800585A1 (en) 1987-01-13 1988-01-12 Device for the alternative operation of a diesel internal combustion engine with diesel oil and rape seed oil

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DE3909750A1 (en) * 1989-03-23 1990-09-27 Elsbett L Scavenging system for the introduction of starting fuel into the injection and fuel system of an internal combustion engine
DE3929115A1 (en) * 1989-09-01 1991-03-07 Elsbett L Injection system for IC engine - has back pressure valve to return fuel to feed tube between tank and pump
DE4136305A1 (en) * 1991-11-04 1993-05-06 Kloeckner-Humboldt-Deutz Ag, 5000 Koeln, De Fuel pump for diesel engine with optional plant oil feed - has simultaneous changeover of maximum torque setting with fuel selection control, compensating loss of performance on changing from diesel to plant oil
DE4433500A1 (en) * 1994-09-20 1996-03-28 Georg Lohmann Viscous fuel supply device for diesel engine
EP0764771A2 (en) * 1995-09-20 1997-03-26 Toyota Jidosha Kabushiki Kaisha Compression ignition type engine
DE19635220A1 (en) * 1996-08-30 1998-05-14 Georg Lohmann Control unit for diesel engines running on oil or fat
DE19817976A1 (en) * 1998-04-22 1999-11-04 Anlagen Und Antriebstechnik No Oil-fuelled motor with non-injected fuel return
FR2795086A1 (en) * 1999-06-16 2000-12-22 Tgs Robin Production of electricity comprises use of recycled waste oil comprising used frying oil
WO2002040621A2 (en) * 2000-08-03 2002-05-23 T.G.S. Robin (Societe A Responsabilite Limitee) Method for producing electric power from used cooking oils
EP1533487A2 (en) 2003-11-18 2005-05-25 Hans-Jürgen Dr. Kampmann Method for operating vehicle and self propulsed machine with natural oil operated engine
EP1647699A1 (en) 2004-10-15 2006-04-19 Wolfram Dipl.-Phys. Univ. Kangler Fuel heat exchange modul
EP1647685A2 (en) 2004-10-15 2006-04-19 Wolfram Dipl.-Phys. Univ. Kangler Method and apparatus for verification of a predetermined fuel mixing ratio
DE202005007712U1 (en) * 2005-05-11 2006-09-21 Storimpex Im- & Export Gmbh Device for running of diesel engine with vegetable oil has control unit for automatic operation of switching valve in order to flush injection system of diesel engine with diesel fuel from diesel tank
DE10353859B4 (en) * 2002-11-28 2007-05-03 Mwb Motorenwerke Bremerhaven Ag Method of operating vehicles and self-propelled working machines equipped with a diesel engine operated by natural oil
WO2007048633A1 (en) * 2005-10-28 2007-05-03 Rainer Dirnhofer Rape/diesel valve
DE102005058609A1 (en) * 2005-11-23 2007-05-24 Diama Gmbh Heater for heating fuel, especially plant oil, comprises a tank coupled with a cooling cycle of a truck engine
DE102006018736A1 (en) * 2006-03-28 2007-10-11 Hallertauer Bioenergie Technologie Gmbh Method for operating combustion engine using multi-fuels, requires injection of specified portions of different first and second fuels
FR2902147A1 (en) * 2006-06-07 2007-12-14 Lycee D Enseignement Agricole Thermal engine e.g. diesel engine, supplying method for tow vehicle, involves adjusting supply to engine by selecting vegetable oil as supply fuel when temperature is higher than or equal to predetermined temperature
DE202008002939U1 (en) 2007-03-07 2008-06-12 Schlenger, Markus Device for operating a diesel engine with fuels from vegetable oils
DE102007031779A1 (en) 2007-07-07 2009-01-08 Deutz Ag Rapeseed oil engine
DE102007031781A1 (en) 2007-07-07 2009-01-08 Deutz Ag Alternatively with diesel fuel or a biogenic fuel operable internal combustion engine
DE102007039114A1 (en) 2007-08-18 2009-02-19 Deutz Ag Fuel temperature control by utilizing system inertia
US20090217912A1 (en) * 2008-02-28 2009-09-03 General Electric Company High viscosity fuel injection pressure reduction system and method

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3909750A1 (en) * 1989-03-23 1990-09-27 Elsbett L Scavenging system for the introduction of starting fuel into the injection and fuel system of an internal combustion engine
DE3929115A1 (en) * 1989-09-01 1991-03-07 Elsbett L Injection system for IC engine - has back pressure valve to return fuel to feed tube between tank and pump
DE4136305A1 (en) * 1991-11-04 1993-05-06 Kloeckner-Humboldt-Deutz Ag, 5000 Koeln, De Fuel pump for diesel engine with optional plant oil feed - has simultaneous changeover of maximum torque setting with fuel selection control, compensating loss of performance on changing from diesel to plant oil
DE4433500A1 (en) * 1994-09-20 1996-03-28 Georg Lohmann Viscous fuel supply device for diesel engine
DE4433500C2 (en) * 1994-09-20 1998-01-15 Georg Lohmann Device for operating diesel engines with greases
EP0764771A2 (en) * 1995-09-20 1997-03-26 Toyota Jidosha Kabushiki Kaisha Compression ignition type engine
DE19635220A1 (en) * 1996-08-30 1998-05-14 Georg Lohmann Control unit for diesel engines running on oil or fat
DE19817976A1 (en) * 1998-04-22 1999-11-04 Anlagen Und Antriebstechnik No Oil-fuelled motor with non-injected fuel return
DE19817976C2 (en) * 1998-04-22 2002-05-16 Anlagen Und Antriebstechnik No Method for operating an engine with a viscous, flammable, liquid fuel, preferably a natural oil
FR2795086A1 (en) * 1999-06-16 2000-12-22 Tgs Robin Production of electricity comprises use of recycled waste oil comprising used frying oil
WO2002040621A2 (en) * 2000-08-03 2002-05-23 T.G.S. Robin (Societe A Responsabilite Limitee) Method for producing electric power from used cooking oils
WO2002040621A3 (en) * 2000-08-03 2007-10-11 T G S Robin Sarl Method for producing electric power from used cooking oils
DE10353859B4 (en) * 2002-11-28 2007-05-03 Mwb Motorenwerke Bremerhaven Ag Method of operating vehicles and self-propelled working machines equipped with a diesel engine operated by natural oil
EP1533487A2 (en) 2003-11-18 2005-05-25 Hans-Jürgen Dr. Kampmann Method for operating vehicle and self propulsed machine with natural oil operated engine
EP1647699A1 (en) 2004-10-15 2006-04-19 Wolfram Dipl.-Phys. Univ. Kangler Fuel heat exchange modul
EP1647685A2 (en) 2004-10-15 2006-04-19 Wolfram Dipl.-Phys. Univ. Kangler Method and apparatus for verification of a predetermined fuel mixing ratio
EP1647685A3 (en) * 2004-10-15 2006-06-07 Wolfram Dipl.-Phys. Univ. Kangler Method and apparatus for verification of a predetermined fuel mixing ratio
DE102004050601B4 (en) * 2004-10-15 2006-12-21 Kangler, Wolfram, Dipl.-Phys. The heat exchange module
US7401601B2 (en) 2004-10-15 2008-07-22 Wolfram Kangler Heat exchanger module
DE202005007712U1 (en) * 2005-05-11 2006-09-21 Storimpex Im- & Export Gmbh Device for running of diesel engine with vegetable oil has control unit for automatic operation of switching valve in order to flush injection system of diesel engine with diesel fuel from diesel tank
WO2007048633A1 (en) * 2005-10-28 2007-05-03 Rainer Dirnhofer Rape/diesel valve
DE102005058609B4 (en) * 2005-11-23 2007-12-20 Diama Gmbh Method and device for controlling a supply of vegetable oil as a fuel
DE102005058609A1 (en) * 2005-11-23 2007-05-24 Diama Gmbh Heater for heating fuel, especially plant oil, comprises a tank coupled with a cooling cycle of a truck engine
DE102006018736A1 (en) * 2006-03-28 2007-10-11 Hallertauer Bioenergie Technologie Gmbh Method for operating combustion engine using multi-fuels, requires injection of specified portions of different first and second fuels
DE102006018736B4 (en) * 2006-03-28 2009-10-01 Hallertauer Bioenergie Technologie Gmbh Internal combustion engine
FR2902147A1 (en) * 2006-06-07 2007-12-14 Lycee D Enseignement Agricole Thermal engine e.g. diesel engine, supplying method for tow vehicle, involves adjusting supply to engine by selecting vegetable oil as supply fuel when temperature is higher than or equal to predetermined temperature
DE202008002939U1 (en) 2007-03-07 2008-06-12 Schlenger, Markus Device for operating a diesel engine with fuels from vegetable oils
EP2014908A1 (en) 2007-07-07 2009-01-14 DEUTZ Aktiengesellschaft Combustion engine that can be operated either with diesel or biogenous fuel
EP2014907A1 (en) 2007-07-07 2009-01-14 DEUTZ Aktiengesellschaft Rapeseed oil engine
DE102007031781A1 (en) 2007-07-07 2009-01-08 Deutz Ag Alternatively with diesel fuel or a biogenic fuel operable internal combustion engine
DE102007031779A1 (en) 2007-07-07 2009-01-08 Deutz Ag Rapeseed oil engine
DE102007039114A1 (en) 2007-08-18 2009-02-19 Deutz Ag Fuel temperature control by utilizing system inertia
EP2028362A2 (en) 2007-08-18 2009-02-25 DEUTZ Aktiengesellschaft Fuel temperature control by exploiting system inactivity
EP2028362A3 (en) * 2007-08-18 2012-01-11 DEUTZ Aktiengesellschaft Fuel temperature control by exploiting system inactivity
US20090217912A1 (en) * 2008-02-28 2009-09-03 General Electric Company High viscosity fuel injection pressure reduction system and method
WO2009108433A2 (en) * 2008-02-28 2009-09-03 General Electric Company High viscosity fuel injection pressure reduction system and method
WO2009108433A3 (en) * 2008-02-28 2009-11-19 General Electric Company High viscosity fuel injection pressure reduction system and method
US8191534B2 (en) 2008-02-28 2012-06-05 General Electric Company High viscosity fuel injection pressure reduction system and method

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