DE102018215847A1 - Fuel metering system for gaseous and liquid fuel - Google Patents
Fuel metering system for gaseous and liquid fuel Download PDFInfo
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- DE102018215847A1 DE102018215847A1 DE102018215847.9A DE102018215847A DE102018215847A1 DE 102018215847 A1 DE102018215847 A1 DE 102018215847A1 DE 102018215847 A DE102018215847 A DE 102018215847A DE 102018215847 A1 DE102018215847 A1 DE 102018215847A1
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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
- 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
- F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
- F02M21/0236—Multi-way valves; Multiple valves forming a multi-way valve system
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- 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
- F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
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- 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
- F02D19/02—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 gaseous fuels
- F02D19/021—Control of components of the fuel supply system
- F02D19/022—Control of components of the fuel supply system to adjust the fuel pressure, temperature or composition
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- 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
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- 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
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- 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
- F02D19/0673—Valves; Pressure or flow regulators; Mixers
- F02D19/0678—Pressure or flow regulators therefor; Fuel metering valves therefor
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- 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
- F02D19/0673—Valves; Pressure or flow regulators; Mixers
- F02D19/0681—Shut-off valves; Check valves; Safety valves; Pressure relief valves
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- 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
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- 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
- F02D19/10—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 peculiar to compression-ignition engines in which the main fuel is gaseous
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
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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
- 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
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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
- 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
- F02M21/0221—Fuel storage reservoirs, e.g. cryogenic tanks
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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
- 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
- F02M21/0221—Fuel storage reservoirs, e.g. cryogenic tanks
- F02M21/0224—Secondary gaseous fuel storages
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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
- 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
- F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
- F02M21/0239—Pressure or flow regulators therefor
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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
- 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
- F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
- F02M21/0242—Shut-off valves; Check valves; Safety valves; Pressure relief valves
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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
- 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
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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
- 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
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- 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
Kraftstoffdosiersystem zur dosierten Abgabe von gasförmigem und flüssigem Kraftstoff, mit einem Gastank (1) für flüssiges, kryogenes Gas, aus dem über eine Gashochdruckpumpe (4) flüssiges Gas entnehmbar und einem Gasrail (10) zuführbar ist. Zwischen der Gashochdruckpumpe (4) und dem Gasrail (10) ist ein Gas-Zwischenspeicher (7) angeordnet, in dem Gas unter einem vorgegebenen Druck gespeichert werden kann, wobei das Gasrail (10) und der Gas-Zwischenspeicher (7) über ein Druckregelventil (8) verbindbar sind. Ein Injektor (20), der mit dem Gasrail (10) verbunden ist und über den Gas aus dem Gasrail (10) dosiert abgegeben werden kann, ist gleichzeitig dazu ausgebildet, flüssigen Kraftstoff unter einem Einspritzdruck abzugeben. Weiter ist ein Gas-Pufferspeicher (15) vorhanden, der mit dem Gasrail (10) und dem Gastank (1) verbindbar ist.Fuel metering system for metered delivery of gaseous and liquid fuel, with a gas tank (1) for liquid, cryogenic gas, from which liquid gas can be removed via a gas high-pressure pump (4) and fed to a gas rail (10). Between the high-pressure gas pump (4) and the gas rail (10) there is a gas buffer (7) in which gas can be stored under a predetermined pressure, the gas rail (10) and the gas buffer (7) via a pressure control valve (8) are connectable. An injector (20), which is connected to the gas rail (10) and via which gas can be dispensed from the gas rail (10), is at the same time designed to dispense liquid fuel under an injection pressure. There is also a gas buffer store (15) which can be connected to the gas rail (10) and the gas tank (1).
Description
Die Erfindung betrifft ein Kraftstoffdosiersystem, wie es zur dosierten Abgabe von gasförmigem und flüssigem Kraftstoff unter einem Eispritz- bzw. Eindüsdruck Verwendung findet.The invention relates to a fuel metering system as used for the metered delivery of gaseous and liquid fuel under an ice spray or injection pressure.
Stand der TechnikState of the art
Gasförmiger Kraftstoff weist in der Regel eine geringe Zündwilligkeit auf, die für eine Selbstzündung nach dem Dieselprinzip nicht ausreicht, muss der gasförmige Kraftstoff fremdgezündet werden. Dies kann beispielsweise durch eine Zündkerze geschehen, die einen Zündfunken in den Brennraum einbringt, oder aber, indem ein zündwilliger, flüssiger Kraftstoff in den Brennraum eingebracht wird, bevor die Hauptmenge an gasförmigem Kraftstoff eingedüst wird. Der flüssige Kraftstoff zündet die Verbrennung, so dass auch der zeitlich nachfolgend eingedüste, gasförmige Kraftstoff verbrennt, was dann den Hauptteil der Verbrennungsenergie freisetzt. Solche Systeme sind aus dem Stand der Technik beispielsweise aus der
Die Versorgung mit dem gasförmigen Kraftstoff funktioniert dabei in der Form, dass der flüssige Kraftstoff über eine Hochdruckpumpe dem Gastank entnommen und verdichtet wird. Der gasförmige Kraftstoff wird anschließend in einem Verdampfer erwärmt und einem Zwischenspeicher zugeführt, in dem gasförmiger Kraftstoff vorgehalten wird. Der Zwischenspeicher befüllt schließlich Gasrail, von dem die einzelnen Injektoren versorgt werden.The supply of the gaseous fuel works in such a way that the liquid fuel is removed from the gas tank and compressed using a high-pressure pump. The gaseous fuel is then heated in an evaporator and fed to an intermediate store in which gaseous fuel is kept. The intermediate store finally fills the gas rail, from which the individual injectors are supplied.
Der Gas-Zwischenspeicher dient dabei vor allem der Pufferung des Gasdrucks und stellt ein Gasreservoir zur Verfügung, um das Gasrail stets ausreichend mit gasförmigem Kraftstoff zu versorgen, ohne dass dieses ein übergroßes Volumen verfügen muss. Bei der Versorgung der Brennkraftmaschine ist es insbesondere wichtig, dass jeder Kraftstoffinjektor stets mit gasförmigem Kraftstoff unter einem lastabhängig variablen Eindüsdruck im Gasrail versorgt wird. Dazu ist zwischen dem Gasrail und dem Gas-Zwischenspeicher ein Gasdruckregler angeordnet, der zum Druckaufbau im Gasrail Gas aus dem Zwischenspeicher entnimmt und zum Druckabbau aus dem Gasrail abführt.The intermediate gas storage primarily serves to buffer the gas pressure and provides a gas reservoir so that the gas rail is always adequately supplied with gaseous fuel without it having to have an excessive volume. When supplying the internal combustion engine, it is particularly important that each fuel injector is always supplied with gaseous fuel under a load-dependent variable injection pressure in the gas rail. For this purpose, a gas pressure regulator is arranged between the gas rail and the intermediate gas storage device, which takes gas from the intermediate storage device to build up pressure in the gas rail and discharges it from the gas rail to reduce pressure.
Beim Ausschalten der Brennkaftmaschine muss das Gasrail druckentlastet werden. Andernfalls besteht die Gefahr, dass gasförmiger Kraftstoff mit der Zeit in Bereiche des Injektors gelangt, in denen es dadurch zu unerwünschten Wirkungen kommt. Der gasförmige Kraftstoff aus dem Gasrail kann zum einen in den Tank zurückgeführt werden, was jedoch dort zu einem großen Wärmeeintrag führt, der unerwünscht ist, da er kryogenen Kraftstoff verdampfen lässt und den Druck entsprechend erhöht. Die andere Möglichkeit besteht darin, den gasförmigen Kraftstoff anderweitig zu entsorgen, beispielsweise in die Umgebung abzublasen oder abzubrennen, was zum einen nicht immer möglich ist und zum anderen den Wirkungsgrad der Brennkraftmaschine insgesamt deutlich herabsetzt.When the fuel press is switched off, the gas rail must be depressurized. Otherwise there is a risk that gaseous fuel will reach areas of the injector over time, which could lead to undesirable effects. The gaseous fuel from the gas rail can be returned to the tank on the one hand, but this leads to a large heat input there, which is undesirable because it allows cryogenic fuel to evaporate and increases the pressure accordingly. The other possibility is to dispose of the gaseous fuel in some other way, for example to blow it off or burn it off into the surroundings, which is not always possible on the one hand and on the other hand significantly reduces the overall efficiency of the internal combustion engine.
Vorteile der ErfindungAdvantages of the invention
Das erfindungsgemäße Kraftstoffdosiersystem weist dem gegenüber den Vorteil auf, dass gasförmiger Kraftstoff nicht oder nur in geringem Maße zurück in den Tank bzw. in die Umwelt abgelassen werden muss, was den Wirkungsgrad der Brennkraftmaschine insgesamt erhöht und seine Umweltverträglichkeit deutlich erhöht. Dazu weist das Kraftstoffdosiersystem einen Gastank für flüssiges kryogenes Gas auf, aus dem über eine Gashochdruckpumpe flüssiges Gas entnehmbar und einem Gasrail zuführbar ist, wobei zwischen der Gashochdruckpumpe und dem Gasrail ein Gaszwischenspeicher angeordnet ist. Im Gaszwischenspeicher wird Gas unter einem vorgegebenen Druck gespeichert, wobei der Gaszwischenspeicher über ein Druckregelventil mit dem Gasrail verbunden ist, aus dem das Gas über einen Injektor dosiert abgegeben werden kann. Der Injektor ist dabei gleichzeitig dazu ausgebildet, flüssigen Kraftstoff unter einem Einspritzdruck abzugeben. Darüber hinaus ist ein Gaspufferspeicher vorhanden, der mit dem Gasrail und dem Gastank verbindbar ist.The fuel metering system according to the invention has the advantage over the fact that gaseous fuel does not have to be drained or only to a small extent back into the tank or into the environment, which increases the overall efficiency of the internal combustion engine and significantly increases its environmental compatibility. For this purpose, the fuel metering system has a gas tank for liquid cryogenic gas, from which liquid gas can be removed and fed to a gas rail via a gas high-pressure pump, a gas buffer being arranged between the gas high-pressure pump and the gas rail. Gas is stored under a predetermined pressure in the gas intermediate store, the gas intermediate store being connected to the gas rail via a pressure control valve, from which the gas can be dispensed in a metered manner via an injector. At the same time, the injector is designed to deliver liquid fuel under an injection pressure. In addition, there is a gas buffer memory that can be connected to the gas rail and the gas tank.
Über den Gaspufferspeicher kann Gas, das aus dem Gasrail abgeführt werden soll, zwischengespeichert werden unter einem Druck der kleiner ist als der Druck, der unter Betriebsdruck im Gasrail bzw. im Gaszwischenspeicher herrscht. Das so gespeicherte Gas kann in das Gasrail zurückgeleitet werden, wenn die Brennkraftmaschine oder der sonstige zu versorgende Verbraucher Gas nur unter einem geringeren Druck benötigt, indem der Gaspufferspeicher über das Druckregelventil mit dem Gasrail verbunden wird. Der minimal einstellbare Gasdruck im Gasrail ist dann der im Gaspufferspeicher herrschende Druck. Auf diese Weise kann ein Großteil des abzuführenden Gases zwischengespeichert und damit wiederverwendet werden und muss nicht in dem Gastank zurückgeführt bzw. in die Umwelt abgeführt werden.Gas that is to be discharged from the gas rail can be temporarily stored via the gas buffer store at a pressure that is less than the pressure that prevails in the gas rail or in the gas intermediate store under operating pressure. The gas stored in this way can be returned to the gas rail if the internal combustion engine or the other consumer to be supplied only requires gas at a lower pressure by connecting the gas buffer store to the gas rail via the pressure control valve. The minimum adjustable gas pressure in the gas rail is then the pressure prevailing in the gas buffer storage. In this way, a large part of the gas to be discharged can be temporarily stored and thus can be reused and does not have to be returned to the gas tank or discharged into the environment.
In einer ersten vorteilhaften Ausgestaltung ist der Gaspufferspeicher über ein Absteuerventil, das als 3/2-Wegeventil ausgeführt ist, mit dem Gasrail und dem Gastank verbindbar. Damit ist es möglich, den Gaspufferspeicher entweder mit dem Druckregelventil oder mit dem Gastank zu verbinden, um einerseits das Gas aus dem Gasrail aufzunehmen und andererseits Gas aus dem Gaspufferspeicher dem Gastank zuzuführen, wenn dies - beispielsweise beim Abstellen des Verbrennungsmotors - nicht vermeidbar ist. Der verbleibende Restdruck im Gaspufferspeicher wird beim Wiederstart des Motors dazu verwendet, den Druck im Gasrail aufzubauen, bevor Gas aus dem Gas-Zwischenspeicher verwendet wird.In a first advantageous embodiment, the gas buffer store can be connected to the gas rail and the gas tank via a control valve, which is designed as a 3/2-way valve. This makes it possible to connect the gas buffer storage either to the pressure control valve or to the gas tank, on the one hand to receive the gas from the gas rail and on the other hand to supply gas from the gas buffer storage to the gas tank if this cannot be avoided, for example when the internal combustion engine is switched off. The remaining pressure in the gas buffer storage is used when the engine is restarted to build up the pressure in the gas rail before gas from the gas buffer storage is used.
In einer weiteren vorteilhaften Ausgestaltung ist das Druckregelventil abhängig vom Druck des flüssigen Kraftstoffs schaltbar. Entscheidend ist dabei der Punkt, dass der Druck des flüssigen Kraftstoffs stets etwas höher sein sollte als der Druck des gasförmigen Kraftstoffs innerhalb des Injektors, um Leckage vom gasförmigen in den flüssigen Kraftstoff zu vermeiden. Indem der Druck des flüssigen Kraftstoffs zur Regelung und zum Schalten der Druckregelventile bzw. der Absteuerventile Verwendung findet, kann eine entsprechende Druckdifferenz zwischen dem gasförmigen und dem flüssigen Kraftstoff im Injektor aufrechterhalten werden.In a further advantageous embodiment, the pressure control valve can be switched depending on the pressure of the liquid fuel. The crucial point here is that the pressure of the liquid fuel should always be somewhat higher than the pressure of the gaseous fuel within the injector in order to avoid leakage from the gaseous into the liquid fuel. A corresponding pressure difference between the gaseous and the liquid fuel in the injector can be maintained by using the pressure of the liquid fuel for regulating and switching the pressure regulating valves or the control valves.
In einer weiteren vorteilhaften Ausgestaltung ist der Gaspufferspeicher mit dem Gaszwischenspeicher über ein Rückschlagventil verbindbar, das nur einen Gasfluss vom Gaspufferspeicher in den Gaszwischenspeicher erlaubt. Dadurch ist eine Überdruckabsicherung des Gaspufferspeichers unter Nutzung der für den Gaszwischenspeicher vorhandenen Sicherheitsventile möglich.In a further advantageous embodiment, the gas buffer store can be connected to the gas intermediate store via a check valve which only allows a gas flow from the gas buffer store into the gas intermediate store. Overpressure protection of the gas buffer store is thereby possible using the safety valves available for the gas intermediate store.
In einem erfindungsgemäßen Verfahren zum Betreiben eines Kraftstoffdosiersystems nach einem der vorhergehenden Ansprüche wird im Gaspufferspeicher ein niedrigerer Druck eingestellt als im Gaszwischenspeicher. Dabei wird in vorteilhafter Ausgestaltung ein vorgegebener maximaler Gaszwischendruck im Gaspufferspeicher nicht überschritten. Durch das zur Verfügung stellen dieses niedrigen Gasdruckniveaus ist ein Gasdruckreservoir im Kraftstoffdosiersystem vorhanden, mit dem das Gasrail und andere Komponenten bei Bedarf befüllt werden können.In a method according to the invention for operating a fuel metering system according to one of the preceding claims, a lower pressure is set in the gas buffer store than in the gas intermediate store. In an advantageous embodiment, a predetermined maximum gas intermediate pressure in the gas buffer store is not exceeded. By making this low gas pressure level available, a gas pressure reservoir is available in the fuel metering system, with which the gas rail and other components can be filled if necessary.
In weiterer vorteilhafter Ausgestaltung des Verfahrens wird der Gaspufferspeicher über ein Absteuerventil mit dem Gastank verbunden, wenn der Druck den vorgegebenen maximalen Gaszwischendruck überschreitet. Damit ist sichergestellt, dass im Gaspufferspeicher kein zu hoher Druck aufgebaut wird, bei dem die Funktion des Gaspufferspeichers nicht mehr gegeben wäre.In a further advantageous embodiment of the method, the gas buffer store is connected to the gas tank via a control valve if the pressure exceeds the predetermined maximum intermediate gas pressure. This ensures that the gas buffer memory does not build up too high a pressure at which the gas buffer memory would no longer function.
In einer weiteren vorteilhaften Weiterbildung des Verfahrens ist der Gaszwischenspeicher über ein Druckregelventil mit dem Gasrail verbindbar, wobei das Druckregelventil so geschaltet wird, dass im Gasrail ein niedrigerer Druck vorhanden ist als der Einspritzdruck des flüssigen Kraftstoffs. Dies ist wichtig, damit im Kraftstoffinjektor kein Überdruck des gasförmigen Kraftstoffs herrscht, um eine Leckage des gasförmigen in den flüssigen Kraftstoff zu verhindern.In a further advantageous development of the method, the gas intermediate store can be connected to the gas rail via a pressure control valve, the pressure control valve being switched so that a lower pressure is present in the gas rail than the injection pressure of the liquid fuel. This is important so that there is no excess pressure of the gaseous fuel in the fuel injector to prevent leakage of the gaseous into the liquid fuel.
FigurenlisteFigure list
- In der Zeichnung ist eine schematische Darstellung des Kraftstoffdosiersystems dargestellt, wobei nur die wesentlichen Komponenten des Kraftstoffdosiersystems dargestellt sind.The drawing shows a schematic representation of the fuel metering system, only the essential components of the fuel metering system being shown.
Beschreibung des AusführungsbeispielsDescription of the embodiment
In
Der Injektor
Das Druckregelventil
Das als 3/2-Wegeventil ausgebildete Absteuerventil
Die Versorgung des Injektors
Zur Regelung des Drucks im Gasrail
Die Regelung der Drücke im Gasrail
Soll der Druck im Gasrail
Soll das Kraftstoffdosiersystem wieder eingeschaltet werden, so kann das Gas aus dem Gaspufferspeicher
Die Verwendung des Gaspufferspeichers
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES 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 of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturPatent literature cited
- DE 102016207743 A1 [0002]DE 102016207743 A1 [0002]
Claims (8)
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DE102018215847.9A DE102018215847A1 (en) | 2018-09-18 | 2018-09-18 | Fuel metering system for gaseous and liquid fuel |
CN201910875525.2A CN110905692A (en) | 2018-09-18 | 2019-09-17 | Fuel metering system for gaseous and liquid fuels |
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DE102018215847.9A DE102018215847A1 (en) | 2018-09-18 | 2018-09-18 | Fuel metering system for gaseous and liquid fuel |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2023099376A1 (en) * | 2021-12-01 | 2023-06-08 | Robert Bosch Gmbh | Internal combustion engine for gaseous fuels |
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CN114623021B (en) * | 2022-03-09 | 2023-06-06 | 一汽解放汽车有限公司 | Pressure regulating system |
Family Cites Families (8)
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CA2532775C (en) * | 2006-01-31 | 2008-04-15 | Westport Research Inc. | Method and apparatus for delivering two fuels to a direct injection internal combustion engine |
CA2716283C (en) * | 2010-10-01 | 2013-07-30 | Westport Power Inc. | Two engine system with a gaseous fuel stored in liquefied form |
DE102011088797A1 (en) * | 2011-12-16 | 2013-06-20 | Robert Bosch Gmbh | Fuel system |
US9482195B2 (en) * | 2013-03-14 | 2016-11-01 | GM Global Technology Operations LLC | Fuel supply system for internal combustion engine and methods of using the same |
US9273638B2 (en) * | 2013-04-15 | 2016-03-01 | Ford Global Technologies, Llc | Variable pressure gaseous fuel regulator |
DE102015209377B4 (en) * | 2015-05-21 | 2017-05-11 | Mtu Friedrichshafen Gmbh | Injection system for an internal combustion engine and internal combustion engine with such an injection system |
DE102015210756A1 (en) * | 2015-06-12 | 2016-12-15 | Robert Bosch Gmbh | Gas injector arrangement, operating method for a gas injector arrangement and internal combustion engine |
DE102016207743A1 (en) * | 2016-05-04 | 2017-11-09 | Robert Bosch Gmbh | Device for metering a gaseous fuel to an injector |
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2018
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WO2023099376A1 (en) * | 2021-12-01 | 2023-06-08 | Robert Bosch Gmbh | Internal combustion engine for gaseous fuels |
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