DE102006001616A1 - Spark ignited piston internal combustion engine operating method for motor vehicle, involves pumping reserve fuel from fuel tank into gas tank, where fuel tank serves as reserve tank for petrol or normal pressure liquid fuel such as ethanol - Google Patents

Spark ignited piston internal combustion engine operating method for motor vehicle, involves pumping reserve fuel from fuel tank into gas tank, where fuel tank serves as reserve tank for petrol or normal pressure liquid fuel such as ethanol Download PDF

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DE102006001616A1
DE102006001616A1 DE102006001616A DE102006001616A DE102006001616A1 DE 102006001616 A1 DE102006001616 A1 DE 102006001616A1 DE 102006001616 A DE102006001616 A DE 102006001616A DE 102006001616 A DE102006001616 A DE 102006001616A DE 102006001616 A1 DE102006001616 A1 DE 102006001616A1
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fuel
tank
reserve
combustion engine
internal combustion
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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
    • F02D19/0639—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
    • F02D19/0655—Biofuels, e.g. plant oils at least one fuel being an alcohol, e.g. ethanol
    • 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
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0686—Injectors
    • F02D19/0689—Injectors for in-cylinder direct injection
    • 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
    • F02D19/0686—Injectors
    • F02D19/0694—Injectors operating with a plurality of fuels
    • 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
    • F02M21/0287—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers characterised by the transition from liquid to gaseous phase ; Injection in liquid phase; Cooling and low temperature storage
    • 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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/12—Other methods of operation
    • F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
    • 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
    • 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

Abstract

The method involves supplying a liquid gas tank (1) with fuel from a fuel high pressure pump. Reserve fuel is pumped from a fuel tank of a piston internal combustion engine into the liquid gas tank. The fuel tank serves as reserve tank for petrol or normal pressure liquid fuel such as ethanol. The combustion engine has a direct inject system for direct injection of liquid gas (3) into a combustion chamber of the engine.

Description

Stand der TechnikState of technology

Verfahren zum Betrieb einer Verbrennungskraftmaschine für Kraftfahrzeuge, insbesondere einer fremdgezündeten Kolbenmaschine mit Direkteinspritzung von Flüssiggas oder anderer flüssigen Kraftstoffe in den Brennraum mit einer vorzugsweise mechanisch angetriebenen Kraftstoffhochdruckpumpe, angeschlossen an ein Kraftstoffvorfördersystem mit mindestens einer Kraftstoffniederdruckpumpe und mindestens einem Flüssiggastank aus dem die Kraftstoffhochdruckpumpe mit Kraftstoff versorgt wird.method for operating an internal combustion engine for motor vehicles, in particular a spark ignited Piston engine with direct injection of LPG or other liquid fuels in the combustion chamber with a preferably mechanically driven High-pressure fuel pump, connected to a fuel advance system with at least one low-pressure fuel pump and at least one LPG tank from which the high-pressure fuel pump is supplied with fuel.

Verbrennungskraftmaschinen, die Flüssiggas dem Brennraum einer Verbrennungskraftmaschine indirekt, das heißt über die Ansaugleitung der Verbrennungsluft, zuführen, nutzen überwiegend das Verdampfungsverfahren um den Kraftstoff Flüssiggas in den Zuführungskanal für die Verbrennungsluft einzubringen. Hierbei drückt sich das Flüssiggas aus dem Tank durch seinen eigenen Verdampfungsdruck in einen kühlwasserbeheizten Verdampfer in dem es aus der Mischphase vollständig in die Gasphase überführt wird. Vom Verdampfer aus wird das gasförmige Flüssiggas unter Überdruck einer eigenen Verteilerleiste zugeführt, von der aus jedem Zylinder, rechnergesteuert über getaktete Elektromagnetventile, für jeden Verbrennungstakt die passende Menge gasförmigen Kraftstoffes in die einströmende Verbrennungsluft eingeblasen wird.Internal combustion engines, the liquefied gas the combustion chamber of an internal combustion engine indirectly, that is on the Intake line of the combustion air, feed, use predominantly the evaporation process to the fuel LPG in the feed channel for the Incorporate combustion air. This expresses the liquefied gas from the tank through its own evaporation pressure into a chilled water heated Evaporator in which it is completely transferred from the mixing phase in the gas phase. From the evaporator, the gaseous LPG under overpressure supplied to its own distribution bar, from which each cylinder, computer controlled via clocked Solenoid valves, for each combustion cycle the appropriate amount of gaseous fuel in the incoming Combustion air is blown.

Diese Systeme können nur bivalent betrieben werden, d.h. sie benötigen neben dem Flüssiggas, zum Starten und Erwärmen des Heizwassers für den Verdampfer einen weiteren Kraftstoff, vorzugsweise Benzin. Dem entsprechend benötigt jeder Kraftstoff einen eigenen Tank, von dem aus der Kraftstoff in einem jeweils eigenen Kraftstoffzuführungssystem dem Brennraum der Verbrennungskraftmaschine zugeführt wird.These Systems can are operated only bivalent, i. they need in addition to the LPG, for starting and heating of the heating water for the Evaporator another fuel, preferably gasoline. Accordingly needed each fuel has its own fuel tank, from which the fuel in a separate fuel supply system to the combustion chamber the internal combustion engine is supplied.

Einspritzsysteme, die das Flüssiggas über eine Pumpe im Flüssiggastank flüssig bis zu den Einspritzventilen für das Flüssiggas führen und das Flüssiggas flüssig in den Zuführungskanal für die Verbrennungsluft vor die Einlassventile spritzen, existieren ebenfalls, konnten sich bisher aber am Markt nicht durchsetzen. Auch sie werden bivalent betrieben, das heißt sie besitzen zwei Kraftstoffbehälter, je einen für das Flüssiggas und einen für Benzin und für jeden Kraftstoff ein separates Kraftstoffzuführungssystem.injection systems, the liquefied gas over a Pump in liquefied gas tank liquid up to the injectors for the liquefied gas to lead and the liquefied gas liquid in the feed channel for the Combustion air splash in front of the intake valves, also exist, but so far could not prevail on the market. They too will operated bivalent, that is they have two fuel tanks, one for each the liquefied gas and one for Gasoline and for everyone Fuel a separate fuel delivery system.

Es sind des weiteren Systeme in der Entwicklung, die Flüssiggas direkt und flüssig in den Brennraum einer fremd gezündeten Brennkraftmaschine einbringen, entweder monovalent betrieben, also nur mit dem Kraftstoff Flüssiggas oder bivalent, also wahlweise mit Flüssiggas oder Ottokraftstoff.It are also systems in development, the liquefied gas direct and fluid into the combustion chamber of a foreign ignited Engage internal combustion engine, either monovalent operated, ie only with the fuel LPG or bivalent, so either with LPG or gasoline.

Allen Flüssiggassystemen gemeinsam ist, dass sie zur Zeit noch Ableitungen von Systemen sind, die für den Kraftstoff Benzin konzipiert sind. Dementsprechend sind die Fahrzeuge, die als Basis für den Betrieb mit Flüssiggas dienen, in der Regel, mit einem Benzintank ausgestattet. Dies wird, aller Voraussicht nach, noch so lange bleiben, bis auf dem Markt Stückzahlen von Fahrzeugen mit Flüssiggas als alleinigem Kraftstoff erreicht werden, die eine spezielle konstruktive Auslegung auf den Kraftstoff Flüssiggas rentabel machen.all LPG systems common is that they are still derivatives of systems at the moment, the for the fuel gasoline are designed. Accordingly, the Vehicles as a basis for Operation with LPG serve, as a rule, equipped with a gas tank. This will, in all likelihood, will remain so until the market numbers of vehicles with LPG as sole fuel can be achieved, which is a special constructive Design on the fuel LPG make profitable.

Dem vorliegenden Verfahren liegt nun das Problem zugrunde, auf der Basis eines Kraftfahrzeuges mit einem, für die direkte Einspritzung von Benzin konzipierten, Verbrennungsmotor, eine Direkteinspritzung von flüssigem Flüssiggas zu konzipieren, die kostengünstig und funktionsfähig ist.the present method is now based on the problem, on the basis of a motor vehicle with one, for direct injection designed by gasoline, internal combustion engine, a direct injection from liquid LPG to design that cost-effectively and functional is.

Mit dem in dem Patentanspruch beschriebenen Verfahren wird dieses Problem gelöst, indem zwar der vorhandene Tank für Kraftstoffe mit geringem Verdampfungsdruck beibehalten wird, aber nur noch als Reservetank für eine monovalente Flüssiggasdirekteinspritzung dient.With the method described in the claim becomes this problem solved by, though the existing tank for Fuels with low evaporation pressure is maintained, but only as a reserve tank for a monovalent LPG direct injection serves.

Diese Lösung hat zum einen den Vorteil, dass sie kostengünstig ist; denn durch die monovalente Variante werden die Bauteile eingespart, die bei bivalentem Betrieb die Kraftstoffzuführungssysteme der beiden Kraftstoffe gegeneinander verriegeln müssten, einschließlich deren elektronischer Steuerung.These solution has the advantage that it is inexpensive; because of the monovalent Variant, the components are saved, the bivalent operation the fuel supply systems of Both fuels would have to lock against each other, including their electronic control.

Gleichzeitig kann sie dem Nutzer die Sorge nehmen, dass sein Fahrzeug bei monovalentem Flüssiggasbetrieb, aufgrund des noch weniger ausgebauten Tankstellennetzes für Flüssiggas, wegen Kraftstoffmangel zum Stillstand kommt.simultaneously can the user be concerned that his vehicle is in monovalent LPG operation, due to the even less developed filling station network for LPG, due to lack of fuel comes to a standstill.

Zusätzlich stellt der Erhalt des Benzintankes die fehlerfreie Funktion der Motorsteuerung
sicher; denn Tankentlüftung und Tankleckerkennung sind Bestandteile der On-Board-Diagnose, die für die Einhaltung von Emissionsgrenzwerten sorgt und den Benzintank so stark in die Regel- und Kontrollkreise der Motorsteuerung einbindet, dass das Weglassen des Benzintankes eine veränderte Architektur des Motorsteuergerätes erfordert.In addition, the receipt of the fuel tank, the error-free function of the engine control
for sure; because tank breather and tank leak detection are components of the on-board diagnostics that ensures compliance with emission limits and so tightly integrates the fuel tank into the control and regulation circuits of the engine management system that the omission of the gas tank requires a modified architecture of the engine control unit.

Zeichnungdrawing

Ausführungsbeispielembodiment

Ein Ausführungsbeispiel ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung erläutert.One embodiment is shown in simplified form in the drawing and in the following Description explained.

1 zeigt die hydraulische Schaltung eines mit Flüssiggas monovalent betriebenen Direkteinspritzsystems für die direkte Einspritzung von Flüssiggas in den Brennraum einer fremd gezündeten Kolbenmaschine einschließlich des Kraftstofftanks für Flüssiggas und des als Reservetank fungierenden Kraftstofftanks für Kraftstoffe mit geringem Verdampfungsdruck wie Benzin oder Ethanol mit ihren Kraftstoffleitungen. 1 Figure 3 shows the hydraulic circuit of a LPG monovalent direct injection system for the direct injection of LPG into the combustion chamber of an externally fired piston engine including the LPG fuel tank and the reserve tank fuel tanks for low vapor pressure fuels such as gasoline or ethanol with their fuel lines.

Beschreibung des Ausführungsbeispielesdescription of the embodiment

Aus einem Flüssiggastank 1 drücken vorzugsweise elektrische Kraftstoffpumpen 2 Flüssiggas 3 über eine Kraftstofffilter 4 und einen Kraftstoffkühler 5 zur Kraftstoffhochdruckpumpe 6. Von dort aus wird ein Teil des Kraftstoffes unter hohem Druck in die Kraftstoffrail 7 gedrückt. Vorzugsweise elektromagnetisch betätigte Einspritzdüsen 8 spritzen den Kraftstoff in den (hier nicht gezeigten) Brennraum ein.From a liquefied gas tank 1 preferably press electrical fuel pumps 2 LPG 3 via a fuel filter 4 and a fuel cooler 5 to the high-pressure fuel pump 6 , From there, part of the fuel is under high pressure in the fuel rail 7 pressed. Preferably electromagnetically actuated injection nozzles 8th inject the fuel into the (not shown here) combustion chamber.

Überschüssiger Kraftstoff und, gegebenenfalls Leckkraftstoff werden über Kraftstoffleitungen 9, 10, 11 zurückgeführt. Der überschüssige Kraftstoff, der durch die Niederdruckkammer der Kraftstoffhochdruckpumpe 6 fließt, verhindert eine unzulässige Erwärmung des Kraftstoffes und als deren Folge Dampfblasen. Ein Kraftstoffdruckregler 12 sorgt für einen konstanten Vordruck am Eingang der Kraftstoffhochdruckpumpe 6. Vom Kraftstoffdruckregler 12 aus fließt der Kraftstoff zurück in den Flüssiggastank. Neigt sich nun der Kraftstoffvorrat im Flüssiggastank 1 dem Ende zu, wird dies dem Fahrer vorzugsweise durch eine rote Leuchtdiode in der Kraftstoffvorratsanzeige des Flüssiggastankes im Cockpit angezeigt. Durch Aktivieren der beiden hydraulisch hintereinander geschalteten, vorzugsweise elektrisch angetriebenen, Kraftstoffpumpen 21 und 22 wird nun im Bedarfsfall Kraftstoff, vorzugsweise Benzin oder Ethanol aus dem Benzintank 20, der normalerweise der Serientank ist, über die Zuführungsleitung 25 in den Füllschlauch für Flüssiggas 23 und von dort aus in den Flüssiggastank gepumpt. Ein Rückschlagventil 24 verhindert, dass beim Tanken von Flüssiggas dieses in den Benzintank 20 gedrückt wird.Excess fuel and, if necessary, fuel leakage are via fuel lines 9 . 10 . 11 recycled. The excess fuel passing through the low-pressure chamber of the high-pressure fuel pump 6 flows, prevents improper heating of the fuel and as a result, vapor bubbles. A fuel pressure regulator 12 ensures a constant admission pressure at the entrance of the high-pressure fuel pump 6 , From the fuel pressure regulator 12 From the fuel flows back into the liquefied gas tank. Now is the fuel supply in the liquefied gas tank 1 To the end, this is preferably indicated to the driver by a red LED in the fuel gauge of the LPG tank in the cockpit. By activating the two hydraulically connected in series, preferably electrically driven, fuel pumps 21 and 22 will now fuel if necessary, preferably gasoline or ethanol from the gas tank 20 , which is usually the series tank, via the feeder pipe 25 in the filling hose for LPG 23 and pumped from there into the liquefied gas tank. A check valve 24 prevents refueling of LPG this in the gas tank 20 is pressed.

Die zweite Kraftstoffpumpe 22 ist notwendig, weil der Druck den die bei Ottomotoren mit Benzindirekteinspritzung üblichen elektrisch angetriebene Intankkraftstoffpumpen erzeugen, nicht oder nicht in allen Betriebszuständen ausreicht, den Reservekraftstoff gegen den Verdampfungsdruck, den das Flüssiggas 3, insbesondere wenn es sich erwärmt hat, erzeugt, in den Flüssiggastank zu drücken.The second fuel pump 22 is necessary because the pressure that produce the usual in gasoline engines with gasoline direct injection electrically driven Intankraftstoffpumpen, not or not sufficient in all operating conditions, the reserve fuel against the evaporation pressure, the liquefied gas 3 , in particular, when it warms up, creates, to press into the liquid gas tank.

Die Anbindung der Zuführungsleitung 25 aus dem Reservetank 20 an die Füllleitung für Flüssiggas 23 stellt sicher, dass die 80%-Grenze für die Befüllung des Flüssiggastankes 1 auch dann nicht überschritten werden kann, wenn versehentlich bei vollem Flüssiggastank 1 die Reservekraftstoffzuführungspumpen 21 und 22 in Betrieb gesetzt werden.The connection of the supply line 25 from the reserve tank 20 to the filling line for LPG 23 Ensures that the 80% limit for filling the liquefied gas tank 1 even then can not be exceeded, if accidentally with full liquefied gas tank 1 the reserve fuel feed pumps 21 and 22 be put into operation.

Claims (1)

Verfahren zum Betrieb einer Verbrennungskraftmaschine für Kraftfahrzeuge, insbesondere einer fremdgezündeten Kolbenmaschine mit Direkteinspritzung von Flüssiggas oder anderer flüssigen Kraftstoffe in den Brennraum mit einer, vorzugsweise mechanisch angetriebenen, Kraftstoffhochdruckpumpe, angeschlossen an ein Kraftstoffvorfördersystem mit mindestens einer Kraftstoffniederdruckpumpe und mindestens einem Flüssiggastank aus dem die Kraftstoffhochdruckpumpe mit Kraftstoff versorgt wird, dadurch gekennzeichnet, dass ein Kraftstofftank für Benzin oder andere bei Normaldruck flüssige Kraftstoffe, vorzugsweise Ethanol, nun als Reservetank dient, aus dem im Bedarfsfall Reservekraftstoff in den Flüssiggastank gepumpt wird.Method for operating an internal combustion engine for motor vehicles, in particular a spark-ignited piston engine with direct injection of LPG or other liquid fuels in the combustion chamber with a, preferably mechanically driven, high-pressure fuel pump connected to a Kraftstoffvorfördersystem with at least one low-pressure fuel pump and at least one LPG tank from which the high-pressure fuel pump with fuel is supplied, characterized in that a fuel tank for gasoline or other liquid under normal pressure fuels, preferably ethanol, now serves as a reserve tank from which reserve fuel is pumped into the liquefied gas tank, if necessary.
DE102006001616A 2006-01-11 2006-01-11 Spark ignited piston internal combustion engine operating method for motor vehicle, involves pumping reserve fuel from fuel tank into gas tank, where fuel tank serves as reserve tank for petrol or normal pressure liquid fuel such as ethanol Withdrawn DE102006001616A1 (en)

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NL2001772C2 (en) * 2008-07-07 2010-01-11 Teleflex Gfi Europ B V Dual fuel e.g. gasoline, injection system for internal combustion engine of motor vehicle, has high pressure pump for pressurizing fuels, and injector injecting pressurized fuels into combustion chamber of engine
EP2143916A1 (en) * 2008-07-07 2010-01-13 Teleflex GFI Europe B.V. Dual fuel injection system and motor vehicle comprising such injection system
WO2015130182A1 (en) * 2014-02-28 2015-09-03 Certools Spółka Jawna Piotr Krzysztof Hanke Fuel supply system for internal combustion engines
CN105089825A (en) * 2014-05-12 2015-11-25 福特环球技术公司 Dual fuel refueling
US9506409B2 (en) 2011-06-24 2016-11-29 Indopar B.V. Method of switching from a liquefied gas fuel to a liquid fuel being provided to a direct injection combustion engine, and direct injection bi-fuel system for such an engine
CN107781044A (en) * 2016-08-31 2018-03-09 现代自动车株式会社 The LPG of dual-fuel vehicle fills complement system
WO2023003522A1 (en) * 2021-07-23 2023-01-26 Sparklpg D.O.O. A dual liquid fuel injection system for an internal combustion direct injection engine, a fuel injection process with said system and an engine comprising said system
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2001772C2 (en) * 2008-07-07 2010-01-11 Teleflex Gfi Europ B V Dual fuel e.g. gasoline, injection system for internal combustion engine of motor vehicle, has high pressure pump for pressurizing fuels, and injector injecting pressurized fuels into combustion chamber of engine
EP2143916A1 (en) * 2008-07-07 2010-01-13 Teleflex GFI Europe B.V. Dual fuel injection system and motor vehicle comprising such injection system
US9506409B2 (en) 2011-06-24 2016-11-29 Indopar B.V. Method of switching from a liquefied gas fuel to a liquid fuel being provided to a direct injection combustion engine, and direct injection bi-fuel system for such an engine
WO2015130182A1 (en) * 2014-02-28 2015-09-03 Certools Spółka Jawna Piotr Krzysztof Hanke Fuel supply system for internal combustion engines
KR20160130416A (en) * 2014-02-28 2016-11-11 썰툴스 스폴카 자우나 피오트르 크리슈토프 항케 Fuel supply system for internal combustion engines
KR102202003B1 (en) 2014-02-28 2021-01-13 썰툴스 스폴카 자우나 피오트르 크리슈토프 항케 Fuel supply system for internal combustion engines
CN105089825A (en) * 2014-05-12 2015-11-25 福特环球技术公司 Dual fuel refueling
DE102016226316B4 (en) 2016-07-13 2023-06-22 Hyundai Motor Company LPG tank cooling system of a dual fuel vehicle
CN107781044A (en) * 2016-08-31 2018-03-09 现代自动车株式会社 The LPG of dual-fuel vehicle fills complement system
CN107781044B (en) * 2016-08-31 2021-05-18 现代自动车株式会社 LPG replenishing system of dual-fuel vehicle
DE102016124520B4 (en) 2016-08-31 2023-06-22 Hyundai Motor Company LPG filling system of a bi-fuel vehicle
WO2023003522A1 (en) * 2021-07-23 2023-01-26 Sparklpg D.O.O. A dual liquid fuel injection system for an internal combustion direct injection engine, a fuel injection process with said system and an engine comprising said system

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