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DE102007051677A1 - Fuel e.g. petrol, mixture controlled production and conveying method for e.g. Otto-engine, involves supplying fuel mixture in fuel mixture tank into high pressure fuel device, pressure rail, fuel injection valve, fuel loop and control unit - Google Patents

Fuel e.g. petrol, mixture controlled production and conveying method for e.g. Otto-engine, involves supplying fuel mixture in fuel mixture tank into high pressure fuel device, pressure rail, fuel injection valve, fuel loop and control unit Download PDF

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Publication number
DE102007051677A1
DE102007051677A1 DE102007051677A DE102007051677A DE102007051677A1 DE 102007051677 A1 DE102007051677 A1 DE 102007051677A1 DE 102007051677 A DE102007051677 A DE 102007051677A DE 102007051677 A DE102007051677 A DE 102007051677A DE 102007051677 A1 DE102007051677 A1 DE 102007051677A1
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fuel
pressure
mixed
tank
mixture
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Karlheinrich Winkelmann
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    • 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
    • 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
    • F02D19/0642—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 at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
    • F02D19/0647—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 at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
    • 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
    • F02D19/0665—Tanks, e.g. multiple tanks
    • 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
    • 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
    • F02D19/08—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 simultaneously using pluralities of fuels
    • F02D19/081—Adjusting the fuel composition or mixing ratio; Transitioning from one fuel to the other
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0245—High pressure fuel supply systems; Rails; Pumps; Arrangement of 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
    • 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
    • F02M37/04—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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/14—Direct injection into combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • 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
    • F02D19/0626—Measuring or estimating parameters related to the fuel supply system
    • F02D19/0628—Determining the fuel pressure, temperature or flow, the fuel tank fill level or a valve position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0076—Details of the fuel feeding system related to the fuel tank
    • F02M37/0088—Multiple separate fuel tanks or tanks being at least partially partitioned
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The method involves maintaining fuel in a defined pressure level above evaporation pressure of fuel mixture (15) by a pressure controller (20) in a low pressure fuel loop (10). Fuel pumps (3, 12) are placed in low and normal pressure fuel tanks (1, 5) in operation with under-run defined fuel level in a fuel mixture tank (13) until a defined upper fuel mixture level is obtained in the tank (13). The mixture in the tank (13) is supplied into a high pressure fuel device (7), a pressure rail (8), a fuel injection valve (9), the low pressure fuel loop and a control unit (11), by a fuel pump (14). An independent claim is also included for a device for controlled production of fuel mixture including normal pressure fuel and low pressure fuel, and for conveying the fuel mixture into a fuel mixture tank in a fuel feed system of an internal combustion engine.

Description

Die Erfindung geht aus von einem Verfahren und einer Vorrichtung zur gesteuerten Erzeugung eines flüssigen Mischkraftstoffes bestehend aus einem Kraftstoff der bei Normaldruck und Normaltemperatur flüssig ist (Normaldruckkraftstoff) und aus einem Kraftstoff, der eines relativ geringen Druckes bedarf um bei Normaldruck und Normaltemperatur in einem Kraftstofftank flüssig gespeichert werden zu können (Niederdruckkraftstoff) und zur Beförderung dieses Mischkraftstoffs aus einem Mischkraftstofftank in das Kraftstoffzuführungssystem einer Verbrennungskraftma schine, aufweisend eine Vorrichtung zur Kraftstoffeinbringung in die Verbrennungskraftmaschine und mindestens einen Kraftstoffkreislauf, vorzugsweise ein Nieder druckkraftstoffkreislauf, der gleichzeitig zur Zuführung von Kraftstoff zur Verbrennung und zur Kühlung des Kraftstoffs dient, indem über die zur Verbrennung benö tigte Kraftstoffmenge hinaus konstant eine definierte Kraftstoffmenge umgewälzt wird, welcher Kraftstoff durch einen Druckregler im Kraftstoffrücklauf auf einem definierten Druckniveau über dem Verdampfungsdruck des Mischkraftstoffs gehalten wird.The The invention is based on a method and a device for controlled production of a liquid mixed fuel consisting of a fuel of liquid at normal pressure and normal temperature is (normal pressure fuel) and from a fuel, the one relatively low pressure required at normal pressure and normal temperature to be stored liquid in a fuel tank (low-pressure fuel) and for conveying this mixed fuel from a mixed fuel tank in the fuel supply system of a Verbrennungskraftma comprising a device for introducing fuel into the internal combustion engine and at least one fuel circuit, preferably a low pressure fuel circuit, the same time for supplying fuel for combustion and for cooling the fuel is used by over the required for combustion Fuel quantity also constant a defined amount of fuel is circulated, which fuel through a pressure regulator in the fuel return at a defined pressure level the evaporation pressure of the mixed fuel is maintained.

Niederdruckkraftstoffe sind Kraftstoffe, wie z. B. Flüssiggas auch Autogas oder LPG bezeichnet, die eines relativ geringen Überdruckes (5–8 bar) bedürfen um bei Normaltemperatur in flüssigem Zustand in einem druckfesten Tank gespeichert werden können.Low pressure fuels are fuels such. As LPG and LPG or LPG denotes that of a relatively low overpressure (5-8 bar) require at normal temperature in liquid state stored in a pressure-resistant tank can be.

Normaldruckkraftstoffe sind Kraftstoffe, wie z. B. Benzin, Ethanol, Diesel, Pflanzenöl, die bei Normaldruck und Normaltemperatur flüssig sind und die keines oder nur eines sehr geringen Überdrucks zur Speicherung bedürfen.Normal pressure fuels are fuels such. As gasoline, ethanol, diesel, vegetable oil, which are liquid at normal pressure and normal temperature and the no or only a very slight overpressure for storage require.

Kraftstoffe die bei Normaldruck gasförmig sind, wie LPG oder CNG versprechen, insbesondere bei Verwendung in einer Brennkraftmaschine die nach dem Selbstzündungsverfahren betrieben wird, eine Reduzierung der Schadstoffrohemissionen bei niedrigen Kosten und ohne Verlust an Leistung. In der Literatur wird bei einer Zumischung von 73% Naturgas als Kraftstoff eine NOx-Reduktion von 24% festgestellt bei einer leicht verbesserten thermischen Effizienz gegenüber dem reinen Dieselkraftstoff.fuels which are gaseous at atmospheric pressure, such as LPG or CNG promise, especially when used in an internal combustion engine after operated by the auto-ignition method, a reduction pollutant raw emissions at low cost and without loss in performance. In the literature, with an admixture of 73% Natural gas as fuel detected a NOx reduction of 24% with a slightly improved thermal efficiency the pure diesel fuel.

Ein eigener Vorversuch ergab bei einer Zumischung von Flüssiggas zu Dieselkraftstoff eine Drehmomentsteigerung von 230 Nm auf 350 Nm bei einer gleichzeitigen Reduzierung des die Emission von Russpartikeln repräsentierenden k-Wertes von 0,53 auf 0,23.One own preliminary test resulted in an admixture of LPG to diesel fuel a torque increase from 230 Nm to 350 Nm with a simultaneous reduction of the emission of soot particles representing k-value from 0.53 to 0.23.

Eine Verbrennungskraftmaschine die mit einem Mischkraftstoff betrieben wird ist aus dem Japanischen Patent 59162337 A bekannt. Das Patent beschreibt eine Verbrennungskraftmaschine die nach dem Dieselprinzip arbeitet und zwei Kraftstofftanks aufweist, einen für Flüssiggas (LPG = Liquefied Petroleum gas – ein Gemisch aus Propan und Butan) und einen für den Dieselkraftstoff. Aus beiden Tanks wird der jeweilige Kraftstoff unter Druck zu einer Mischkammer gefördert, wo sie sich mischen. Von der Mischkammer aus gelangt die Kraftstoffmischung anschließend über eine Kraftstoffleitung zu einer Hochdruckpumpe und über Einspritzventile direkt in den Brennraum eines Dieselmotors.An internal combustion engine which is operated with a mixed fuel is from the Japanese Patent 59162337 A known. The patent describes an internal combustion engine which operates on the diesel principle and has two fuel tanks, one for liquefied petroleum gas (LPG = liquefied petroleum gas - a mixture of propane and butane) and one for the diesel fuel. From both tanks, the respective fuel is conveyed under pressure to a mixing chamber, where they mix. From the mixing chamber, the fuel mixture then passes via a fuel line to a high pressure pump and injectors directly into the combustion chamber of a diesel engine.

Nachteilig bei dieser Ausführung ist, dass die Verbrennungskraftmaschine keinen kühlenden Kraftstoffkreislauf aufweist, der dafür sorgt, dass auch bei Lastzuständen der Verbrennungskraftmaschine mit geringem Kraftstoffdurchsatz, wie Leerlauf, sich der Kraftstoff an heißen Bauteilen der Verbrennungskraftmaschine erhitzt und in Folge dessen Dampfblasen in dem Kraftstoff entstehen, die den Betrieb der Verbrennungskraftmaschine stören, im Extremfall bis zum völligen Stillstand.adversely in this design is that the internal combustion engine does not have a cooling fuel circuit for it ensures that even under load conditions of the internal combustion engine With low fuel flow, such as idle, the fuel itself heated to hot components of the internal combustion engine and as a result, vapor bubbles are formed in the fuel, the interfere with the operation of the internal combustion engine, in extreme cases to a complete standstill.

In der DE 203 10 824 U1 wird vorgeschlagen den gewünschten Mischkraftstoff schon vor dem Tanken zu erzeugen um den Mischungsprozess aus dem Kraftstoffzuführungsprozess auszulagern. Dazu müsste aber eine zusätzliche Tankinfrastruktur für den Mischkraftstoff geschaffen werden, zumal als Niederdruckkraftstoffkomponente ausschließlich Butan verwendet werden soll.In the DE 203 10 824 U1 It is proposed to produce the desired mixed fuel before refueling in order to outsource the mixing process from the fuel supply process. For this purpose, however, an additional tank infrastructure for the mixed fuel would have to be created, especially as the low-pressure fuel component exclusively butane should be used.

Nachteilig ist hier ebenfalls, dass ein verbrauchsunabhängiger Durchfluss von Kraftstoff zu Kühlungszwecken durch den Kraftstoffniederdruckbereich wie er beispielsweise in der EP 06023 298 beschrieben ist, nicht vorgesehen ist. Dadurch kann es trotz Rückführung des nicht eingespritzten überschüssigen Kraftstoffvolumens und des Leckagevolumens der Kraftstoffhochdruckpumpe in den Kraftstofftank zu Dampfblasenbildung aus dem Kraftstoff kommen, wenn auf Grund des zu geringen Kraftstoffdurchsatzes der Wärmeeintrag aus dem Motor in den Kraftstoff nicht mehr in ausreichendem Maße abgeführt werden kann.The disadvantage here is also that a consumption-independent flow of fuel for cooling purposes by the fuel low pressure range as he, for example, in the EP 06023 298 is not intended. As a result, despite the return of the uninsulated excess fuel volume and the leakage volume of the high-pressure fuel pump into the fuel tank, vapor bubbles may form in the fuel if the heat input from the engine into the fuel can no longer be dissipated to a sufficient extent due to the insufficient fuel throughput.

Diese Nachteile werden durch die oben beschriebenen Patentansprüche der Erfindung vermieden.These Disadvantages are due to the claims described above avoided the invention.

Durch die Einspritzung eines Kraftstoffgemisches von schwer- und leicht siedenden Kraftstoffen wird angestrebt den Gleichdruckprozess der dieselmotorischen Verbrennung mit der Gleichraumverbrennung des Otto-Motors zu kombinieren. Die hohe Verdampfungsneigung des Ottokraftstoffes führt zu einer schnelleren Vermischung mit der Verbrennungsluft und damit zu vollständigerer Verbrennung des Kraftstoffes, woraus Vorteile hinsichtlich der Emission von Schadstoffen, besonders bei den Partikeln resultieren.Through the injection of a fuel mixture of heavy and low-boiling fuels is sought to combine the constant pressure process of diesel engine combustion with the combustion of the gasoline engine. The high propensity to vaporize the petrol leads to a faster mixing with the combustion air and thus to more complete combustion of the fuel, resulting in advantages in terms of the emission of pollutants, especially in the Parti result.

Zusätzlich senkt die Verdampfungskälte des eingespritzten Ottokraftstoffes die Temperatur und wirkt dadurch der Bildung von Stickoxiden entgegen.additionally lowers the evaporative coldness of the injected gasoline the temperature and thereby counteracts the formation of nitrogen oxides.

Schließlich lässt sich auch die Leistung steigern, wenn man den Luftüberschuss des Dieselverfahrens dazu nutzt zusätzlichen Ottokraftstoff zu verbrennen, wie es bei der homogenen Dieselverbrennung angestrebt wird.After all can also increase the power, if the excess air The diesel process uses additional gasoline to burn, as it aimed at the homogeneous diesel combustion becomes.

Weiter ist die Erzeugung des Mischkraftstoffes aus Kraftstoffen die in zwei separaten Kraftstofftanks als Teil des Kraftstoffzuführungssystem gespeichert sind, vorteilhaft, weil für die Befüllung der separaten Kraftstofftanks die vorhandene Tankstelleninfrastruktur genutzt werden kann.Further is the production of the mixed fuel from fuels in two separate fuel tanks as part of the fuel delivery system are stored, advantageous because of the filling the separate fuel tanks the existing gas station infrastructure can be used.

Zusätzlich ist es möglich, direkt einspritzende Ottomotoren mit dieser Kraftstoffzuführungskonfiguration zu betreiben.additionally Is it possible to use directly injecting gasoline engines with this Operate fuel supply configuration.

In 1 ist eine bevorzugte Ausführung der Erfindung schematisch dargestellt. Sie zeigt die Vorrichtung zur gesteuerten Erzeugung des Mischkraftstoffes und zur Einbringung dieses Mischkraftstoffes in eine Verbrennungskraftmaschine.In 1 a preferred embodiment of the invention is shown schematically. It shows the device for the controlled generation of the mixed fuel and for introducing this mixed fuel into an internal combustion engine.

Aus einem Mischkraftstofftank (13), vorzugsweise ein Tank für Flüssiggas (LPG), wird durch eine Kraftstoffpumpe (14) ein Mischkraftstoff (15) aus Normaldruckkraftstoff (6), vorzugsweise Diesel und Niederdruckkraftstoff, vorzugsweise LPG (2), in einen Kraftstoffniederdruckkreislauf (10, 17–21) gepumpt. Der Kraftstoffniederdruckkreislauf (10, 17–21) weist in einer bevorzugten Ausführung einen Kraftstoffvorlauf (19) auf, der über einen Kraftstofffilter (17) zu einer Kraftstoffhochdruckpumpe (18) führt. Ein Wärmetauscher (21) zwischen Kraftstofffilter (17) und Kraftstoffhochdruckpumpe (18), hält, geregelt durch das Steuergerät (11), die Kraftstofftemperatur unter einem definierten Wert, der so festgelegt ist, dass betriebsstörende Verdampfungen aus dem Mischkraftstoff (15) auf seinem Weg zur Kraftstoffhochdruckpumpe (18) vermieden werden.From a mixed fuel tank ( 13 ), preferably a liquefied petroleum gas tank (LPG), is powered by a fuel pump ( 14 ) a mixed fuel ( 15 ) from normal pressure fuel ( 6 ), preferably diesel and low pressure fuel, preferably LPG ( 2 ), into a low-pressure fuel circuit ( 10 . 17 - 21 ) pumped. The low-pressure fuel circuit ( 10 . 17 - 21 ) in a preferred embodiment, a fuel supply ( 19 ), which via a fuel filter ( 17 ) to a high-pressure fuel pump ( 18 ) leads. A heat exchanger ( 21 ) between fuel filter ( 17 ) and high-pressure fuel pump ( 18 ), controlled by the control unit ( 11 ), the fuel temperature below a defined value, which is set so that malfunctioning evaporations from the mixed fuel ( 15 ) on its way to the high-pressure fuel pump ( 18 ) be avoided.

Der Wärmetauscher (21) kann seine Kühlenergie aus einer Klimaanlage beziehen. Das Kraftstoffvolumen das im Kraftstoffniederdruckkreislauf (10, 17–21) umgewälzt wird liegt um ein mehrfaches höher als zur Verbrennung notwendig. Ein widerstandsarmer, gegebenenfalls zusätzlich geschaffener, Abfluss aus dem Nieder druckbereich der Hochdruckpumpe (18) ermöglicht einen konstant hohen Kraftstoffumlauf, der die Kraftstoffkühlung unabhängig vom aktuellen Verbrauch der Verbrennungskraftmaschine (23) sicher stellt, indem er Dampfblasen aus dem Kraftstoff verhindert.The heat exchanger ( 21 ) can draw its cooling energy from an air conditioner. The fuel volume in the low-pressure fuel circuit ( 10 . 17 - 21 ) is circulated several times higher than necessary for combustion. A low-resistance, optionally additionally created, drain from the low pressure range of the high-pressure pump ( 18 ) allows a constant high fuel circulation, the fuel cooling regardless of the current consumption of the internal combustion engine ( 23 ) by preventing vapor bubbles from the fuel.

Ein Druckregler (20) in der Kraftstoffrückleitung (10) hält den Druck im Kraftstoffniederdruckkreislauf (10, 17–21) über dem Verdampfungsdruck des Mischkraftstoffs(15).A pressure regulator ( 20 ) in the fuel return line ( 10 ) keeps the pressure in the low-pressure fuel circuit ( 10 . 17 - 21 ) above the evaporation pressure of the mixed fuel ( 15 ).

Der zur Verbrennung notwendige Kraftstoff wird in der Kraftstoffhochdruckpumpe (18) weiter verdichtet und gelangt über eine Hochdruckkraftstoffleitung (7) in die Kraftstoffrail (8). Von dort aus führen weitere Kraftstoffhochdruckleitungen (7) zu den Kraftstoffeinspritzventilen (9) die den Mischkraftstoff (15) in die Brennkammer der Verbrennungskraftmaschine (23) einspritzen. Der ganze Vorgang wird von dem Steuergerät (E. C. U.) (11) geregelt.The fuel necessary for combustion is in the high-pressure fuel pump ( 18 ) and passes through a high-pressure fuel line ( 7 ) in the fuel rail ( 8th ). From there, further high-pressure fuel lines ( 7 ) to the fuel injection valves ( 9 ) the mixed fuel ( 15 ) in the combustion chamber of the internal combustion engine ( 23 ) inject. The whole process is carried out by the control unit (ECU) ( 11 ).

Erzeugt wird der Mischkraftstoff (15) indem aus den Kraftstofftanks für den Normaldruckkraftstoff (5) und für den Niederdruckkraftstoff (1) die jeweiligen Kraftstoffe (2, 4) in den Mischkraftstofftank (13) gepumpt werden. Rückschlagventile (22) verhindern, dass der Kraftstoff aus dem Mischkraftstofftank (13) in die Kraftstofftanks (1, 5) zurückgedrückt wird.The mixed fuel is produced ( 15 ) from the fuel tanks for the normal pressure fuel ( 5 ) and for the low-pressure fuel ( 1 ) the respective fuels ( 2 . 4 ) into the mixed fuel tank ( 13 ) are pumped. Check valves ( 22 ) prevent the fuel from the mixed fuel tank ( 13 ) into the fuel tanks ( 1 . 5 ) is pushed back.

Ausgelöst wird der Pumpvorgang durch ein Messinstrument (16) welches das Kraftstoffniveau im Mischkraftstofftank (13) erfasst. Unterschreitet dieses ein definiertes Maß, wird durch die E. C. U. (11) die Kraftstoffpumpen (12, 3) in den Kraftstofftanks (1, 5) in gang gesetzt. Zuerst die Kraftstoffpumpe (12) im Normaldruckkraftstofftank (5) so lange, bis ein anderes, definiertes Volumen erreicht ist und anschließend die Kraftstoffpumpe (3) im Niederdruckkraftstofftank (1) ebenfalls bis ein weiteres, definiertes Kraftstoffvolumen eingefüllt ist. Diese Reihenfolge verhindert, dass kurzzeitig ein Mischungsverhältnis im Mischkraftstofftank (13) entsteht, das durch einen zu großen Anteil von Niederdruckkraftstoff (2) im Mischkraftstoff (15) zu Störungen im Verbrennungsablauf führen könnte.The pumping process is triggered by a measuring instrument ( 16 ) which determines the fuel level in the mixed fuel tank ( 13 ) detected. If this falls below a defined level, the ECU ( 11 ) the fuel pumps ( 12 . 3 ) in the fuel tanks ( 1 . 5 ) set in motion. First the fuel pump ( 12 ) in the normal pressure fuel tank ( 5 ) until another, defined volume is reached and then the fuel pump ( 3 ) in the low-pressure fuel tank ( 1 ) is also filled until another, defined fuel volume. This order prevents a short-term mixing ratio in the mixed fuel tank ( 13 ) caused by too large a proportion of low-pressure fuel ( 2 ) in the mixed fuel ( 15 ) could lead to disturbances in the combustion process.

Das Kraftstoffniveau zu Beginn des Mischvorgangs sollte nicht zu niedrig sein, damit die Abweichung vom optimalen Mischungsverhältnis der Kraftstoffe (2, 4) während des Mischvorgangs nicht zu groß ist.The fuel level at the beginning of the mixing process should not be too low for the deviation from the optimum mixing ratio of the fuels ( 2 . 4 ) is not too large during the mixing process.

ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION

Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Zitierte PatentliteraturCited patent literature

  • - JP 59162337 A [0006] - JP 59162337 A [0006]
  • - DE 20310824 U1 [0008] - DE 20310824 U1 [0008]
  • - EP 06023298 [0009] EP 06023298 [0009]

Claims (5)

Verfahren zur gesteuerten Erzeugung eines Mischkraftstoffes 15 bestehend aus einem Kraftstoff der bei Normaldruck und Normaltemperatur flüssig ist (Normaldruckkraftstoff) 6 und aus einem Kraftstoff, der eines relativ geringen Druckes bedarf, um bei Normaldruck und Normaltemperatur in einem Kraftstofftank 1 flüssig gespeichert werden zu können (Niederdruckkraftstoff) 2 und zur Beförderung dieses Mischkraftstoffs 15 aus einem Mischkraftstofftank 13 in das Kraftstofffördersystem 7–11, 17–20 einer Verbrennungskraftmaschine 23, aufweisend eine Vorrichtung zur Kraftstoffeinbringung in die Verbrennungskraftmaschine 7–9, 11,18 und mindestens einen Kraftstoffkreislauf, vorzugsweise ein Niederdruckkraftstoffkreislauf 10, 17–21, der gleichzeitig der Zuführung von Kraftstoff zur Verbrennung und der Kühlung des Kraftstoffs dient, indem über die zur Verbrennung benötigte Kraftstoffmenge hin aus eine definierte Kraftstoffmenge konstant umgewälzt wird, welcher Kraftstoff durch einen Druckregler 20 im Kraftstoffrücklauf 10 auf einem definierten Druckniveau über dem Verdampfungsdruck des Mischkraftstoffs 15 gehalten wird, dadurch gekennzeichnet, dass bei Unterschreiten eines definierten Kraftstoffniveaus im Mischkraftstofftank 13 die Kraftstofffördervorrichtung 3, 12 in den Kraftstofftanks 1, 5 der beiden Ausgangskraftstoffe 2, 6 in Gang gesetzt werden, bis im Mischkraftstofftank 13 ein definiertes oberes Mischkraftstoffniveau erreicht ist und dass eine Kraftstofffördervorrichtung 14 im Mischkraftstofftank 13 den Mischkraftstoff 15 in das Kraftstofffördersystem 7–11, 17–20 der Verbrennungskraftmaschine einspeist.Method for the controlled production of a mixed fuel 15 consisting of a fuel which is liquid at atmospheric pressure and normal temperature (normal pressure fuel) 6 and a fuel that requires a relatively low pressure to at normal pressure and normal temperature in a fuel tank 1 to be stored in liquid form (low-pressure fuel) 2 and for transporting this mixed fuel 15 from a mixed fuel tank 13 into the fuel delivery system 7 - 11 . 17 - 20 an internal combustion engine 23 , comprising a device for introducing fuel into the internal combustion engine 7 - 9 . 11 . 18 and at least one fuel circuit, preferably a low pressure fuel circuit 10 . 17 - 21 which simultaneously serves to supply fuel for combustion and to cool the fuel by constantly circulating a defined amount of fuel out of the amount of fuel required for combustion, which fuel passes through a pressure regulator 20 in the fuel return 10 at a defined pressure level above the evaporation pressure of the mixed fuel 15 is held, characterized in that falls below a defined fuel level in the mixing fuel tank 13 the fuel delivery device 3 . 12 in the fuel tanks 1 . 5 the two starting fuels 2 . 6 be started until in the mixed fuel tank 13 a defined upper mixed fuel level is reached and that a fuel delivery device 14 in the mixed fuel tank 13 the mixed fuel 15 into the fuel delivery system 7 - 11 . 17 - 20 the internal combustion engine feeds. Verfahren zur gesteuerten Erzeugung eines Mischkraftstoffes 15 nach Anspruch 1 dadurch gekennzeichnet, dass die Kraftstofffördervorrichtung 3, 12 in den Kraftstofftanks 1, 5 der beiden Ausgangskraftstoffe 2, 6 durch eine Steuerung 11 nacheinander in Gang gesetzt werden und zwar zuerst die Kraftstofffördervorrichtung 12 im Normaldruckkraftstofftank 5 so lange bis ein anderes definiertes Mischkraftstoffniveau erreicht ist und nachfolgend die Kraftstofffördervorrichtung 3 im Niederdruckkraftstofftank 1 ebenfalls so lange bis ein definiertes oberes Mischkraftstoffniveau erreicht ist.Method for the controlled production of a mixed fuel 15 according to claim 1, characterized in that the fuel delivery device 3 . 12 in the fuel tanks 1 . 5 the two starting fuels 2 . 6 through a controller 11 be started sequentially and that first the fuel delivery device 12 in normal pressure fuel tank 5 until another defined mixed fuel level is reached and subsequently the fuel delivery device 3 in the low-pressure fuel tank 1 also until a defined upper mixed fuel level is reached. Verfahren zur gesteuerten Erzeugung eines Mischkraftstoffes 15 nach einem der vorhergehenden Ansprüchen dadurch gekennzeichnet, dass eine Kraftstoffkühlvorrichtung 21 stromabwärts der Komponenten zur Einbringung des Kraftstoffs 7–9, 11, 18 in die Verbrennungskraftmaschine 23 den zufließenden Kraftstoff kühlt.Method for the controlled production of a mixed fuel 15 according to one of the preceding claims, characterized in that a fuel cooling device 21 downstream of the components for introducing the fuel 7 - 9 . 11 . 18 in the internal combustion engine 23 cools the incoming fuel. Verfahren zur gesteuerten Erzeugung eines Mischkraftstoffes 15 nach einem der vorhergehenden Ansprüchen dadurch gekennzeichnet, dass ein Butangemisch als Niederdruckkraftstoff 2 im Mischkraftstoff 15 genutzt wird.Method for the controlled production of a mixed fuel 15 according to one of the preceding claims, characterized in that a butane mixture as low-pressure fuel 2 in mixed fuel 15 is being used. Vorrichtung zur gesteuerten Erzeugung eines Mischkraftstoffes 15 bestehend aus einem Kraftstoff der bei Normaldruck und Normaltemperatur flüssig ist (Normaldruckkraftstoff) 6 und aus einem Kraftstoff, der eines relativ geringen Druckes bedarf um bei Normaldruck und Normaltemperatur in einem Kraftstofftank 1 flüssig gespeichert werden zu können (Niederdruckkraftstoff) 2 und zur Beförderung dieses Mischkraftstoffs 15 aus einem Mischkraftstofftank 13 in das Kraftstofffördersystem 7–11, 17–20 einer Verbrennungskraftmaschine 23, aufweisend eine Vorrichtung zur Kraftstoffeinbringung 7–9, 10, 18 in die Verbrennungskraftmaschine 23 und mindestens einen Kraftstoffkreislauf, vorzugsweise ein Niederdruckkraftstoffkreislauf 10, 17–21, der gleichzeitig der Zuführung von Kraftstoff zur Verbrennung und der Kühlung des Kraftstoffs dient, indem über die zur Verbrennung benötigte Kraftstoffmenge hinaus konstant eine definierte Kraftstoffmenge umgewälzt wird, welcher Kraftstoff durch einen Druckregler 20 im Kraftstoffrücklauf 10 auf einem definierten Druckniveau über dem Verdampfungsdruck des Mischkraftstoffs 15 gehalten wird, dadurch gekennzeichnet, dass aus einem Kraftstofftank 5 mit Normaldruckkraftstoff 6 und aus einem Kraftstofftank 1 für Niederdruckkraftstoff 2 durch jeweils eine Kraftstofffördereinrichtung 3, 12, vorzugsweise eine oder mehrere Kraftstoffpumpe(n), Kraftstoff in definierter Menge in den druckfesten Mischkraftstofftank 13 gefördert wird und der Mischkraftstofftank 13 eine Messvorrichtung für das Kraftstoffniveau 16 aufweist und eine Kraftstofffördereinrichtung 14, die den Mischkraftstoff 15 in den Niederdruckkraftstoffkreislauf 10, 17–21 der Verbrennungskraftmaschine 23 fördert.Device for the controlled production of a mixed fuel 15 consisting of a fuel which is liquid at atmospheric pressure and normal temperature (normal pressure fuel) 6 and from a fuel that requires a relatively low pressure to at normal pressure and normal temperature in a fuel tank 1 to be stored in liquid form (low-pressure fuel) 2 and for transporting this mixed fuel 15 from a mixed fuel tank 13 into the fuel delivery system 7 - 11 . 17 - 20 an internal combustion engine 23 comprising a device for introducing fuel 7 - 9 . 10 . 18 in the internal combustion engine 23 and at least one fuel circuit, preferably a low pressure fuel circuit 10 . 17 - 21 which simultaneously serves to supply fuel for combustion and to cool the fuel by constantly circulating a defined amount of fuel over the amount of fuel needed for combustion, which fuel is passed through a pressure regulator 20 in the fuel return 10 at a defined pressure level above the evaporation pressure of the mixed fuel 15 is held, characterized in that from a fuel tank 5 with normal pressure fuel 6 and from a fuel tank 1 for low pressure fuel 2 by a respective fuel delivery device 3 . 12 , Preferably one or more fuel pump (s), fuel in a defined amount in the pressure-resistant mixed fuel tank 13 and the mixed fuel tank 13 a measuring device for the fuel level 16 and a fuel delivery device 14 that the mixed fuel 15 in the low-pressure fuel cycle 10 . 17 - 21 the internal combustion engine 23 promotes.
DE102007051677A 2007-10-26 2007-10-26 Fuel e.g. petrol, mixture controlled production and conveying method for e.g. Otto-engine, involves supplying fuel mixture in fuel mixture tank into high pressure fuel device, pressure rail, fuel injection valve, fuel loop and control unit Withdrawn DE102007051677A1 (en)

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WO2011088830A1 (en) * 2010-01-25 2011-07-28 York Industries International Hk. Ltd Dual fuel supply system, methods for switching between different fuel types and method for retro-fitting a heavy fuel system
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WO2014193236A1 (en) * 2013-05-30 2014-12-04 Indopar B.V. A bi-fuel system and a method for operating such a system
KR20160018589A (en) * 2013-05-30 2016-02-17 인도파 베.파우. A bi-fuel system and a method for operating such a system
US9581093B2 (en) 2013-05-30 2017-02-28 Indopar B.V. Bi-fuel system and a method for operating such a system
WO2017215816A1 (en) * 2016-06-16 2017-12-21 Robert Bosch Gmbh Fuel delivery device for cryogenic fuels, gas injection system and method for operating a fuel delivery device
EP3578784A1 (en) * 2018-06-05 2019-12-11 Certools Spólka Jawna Piotr Czekalski Krzysztof Hanke Petrol/diesel and lpg fuel supply system for internal combustion engines
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