DE102016118976A1 - Method for starting preparation and preferably for the subsequent starting of a designed as a gas engine or dual-fuel engine internal combustion engine - Google Patents
Method for starting preparation and preferably for the subsequent starting of a designed as a gas engine or dual-fuel engine internal combustion engine Download PDFInfo
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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
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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
- F02D19/0623—Failure diagnosis or prevention; Safety measures; Testing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
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- 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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- 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
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- 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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- 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
- F02D19/105—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 operating in a special mode, e.g. in a liquid fuel only mode for starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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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- F02D41/008—Controlling each cylinder individually
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- F02D41/008—Controlling each cylinder individually
- F02D41/0082—Controlling each cylinder individually per groups or banks
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- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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
- F02M21/0248—Injectors
- F02M21/0278—Port fuel injectors for single or multipoint injection into the air intake system
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- 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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- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
- F02D2041/225—Leakage detection
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- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N99/00—Subject matter not provided for in other groups of this subclass
- F02N99/002—Starting combustion engines by ignition means
- F02N99/008—Providing a combustible mixture outside the cylinder
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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
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
Verfahren zur Startvorbereitung und vorzugsweise zum nachfolgenden Starten einer als Gasmotor ausgebildeten Brennkraftmaschine (10) oder einer als Dual-Fuel-Motor ausgebildeten Brennkraftmaschine (10) mit einem gasförmigem Kraftstoff, wobei die Brennkraftmaschine (10) mindestens eine Gruppe (11) von in einer Reihe angeordneten Zylindern (12) aufweist, denen ein gasförmiger Kraftstoff über eine zylindergruppenindividuelle Kraftstoffzuführleitung (13), von der zu den Zylindern (12) der jeweiligen Gruppe (11) führende zylinderindividuelle Kraftstoffzuführleitungen (14) abzweigen, zuführbar ist, mit zumindest folgenden Schritten: in einem Schritt a) wird zunächst die jeweilige vom gasförmigen Kraftstoff entleerte und insbesondere mit Luft befüllte, zylindergruppenindividuelle Kraftstoffzuführleitung (13) durch Öffnen eines zylindergruppenindividuellen Kraftstoffzuführventils (15) mit einem gasförmigen Kraftstoff definiert befüllt und hierbei überwacht, ob nach Schließen des zylindergruppenindividuellen Kraftstoffzuführventils (15) ein in der zylindergruppenindividuellen Kraftstoffzuführleitung (13) herrschender Druck für eine definierte Zeitdauer in einem definierten Druckbereich liegt. Dann, wenn in Schritt a) festgestellt wird, dass der in der zylindergruppenindividuellen Kraftstoffzuführleitung (13) herrschende Druck für die definierte Zeitdauer in dem definierten Druckbereich liegt, wird in einem nachfolgenden Schritt b) durch Öffnen und nachfolgendes Schließen eines zylinderindividuellen Kraftstoffzuführventils (16), welches dem in der Gruppe (11) in Gasflussrichtung letzten Zylinder (12) oder der jeweiligen zylinderindividuellen Kraftstoffzuführleitung (14) des in der Gruppe (11) letzten Zylinders (12) zugeordnet ist, der gasförmige Kraftstoff gleichförmig in der jeweiligen zylindergruppenindividuellen Kraftstoffzuführleitung (13) verteilt.A method for starting preparation and preferably for subsequently starting a designed as a gas engine internal combustion engine (10) or designed as a dual-fuel engine internal combustion engine (10) with a gaseous fuel, wherein the internal combustion engine (10) at least one group (11) of in a row arranged cylinders (12) to which a gaseous fuel via a cylinder group individual fuel supply line (13) from which to the cylinders (12) of the respective group (11) leading cylinder individual Kraftstoffzuführleitungen (14) can be fed, at least with the following steps: in In step a), the respective cylinder-group-specific fuel supply line (13) emptied of gaseous fuel and filled in particular with air is filled with a gaseous fuel by opening a cylinder-group-specific fuel supply valve (15) and monitoring whether after closing s cylinder group individual fuel supply valve (15) in the cylinder group individual fuel supply line (13) prevailing pressure for a defined period of time in a defined pressure range. Then, when it is determined in step a) that the pressure prevailing in the cylinder group-specific fuel supply line (13) for the defined period of time in the defined pressure range, in a subsequent step b) by opening and subsequently closing a cylinder-individual Kraftstoffzuführventils (16), which is assigned to the last cylinder (12) in the gas flow direction in the group (11) or the respective cylinder-specific fuel supply line (14) of the last cylinder (12) in the group (11), the gaseous fuel being uniform in the respective cylinder group-specific fuel supply line (13) distributed.
Description
Die Erfindung betrifft ein Verfahren zur Startvorbereitung und vorzugsweise zum nachfolgenden Starten einer als Gasmotor oder Dual-Fuel-Motor ausgebildeten Brennkraftmaschine. The invention relates to a method for starting preparation and preferably for the subsequent starting of a designed as a gas engine or dual-fuel engine internal combustion engine.
Der grundsätzliche Aufbau sowie die grundsätzliche Funktionsweise einer als Gasmotor oder als Dual-Fuel-Motor ausgebildeten Brennkraftmaschine sind dem hier angesprochenen Fachmann geläufig. So verfügt ein Gasmotor typischerweise über mehrere Zylinder, in welchen ausschließlich gasförmiger Kraftstoff, wie zum Beispiel Methan, verbrannt wird. Ein Dual-Fuel-Motor verfügt typischerweise ebenfalls über mehrere Zylinder, in welchen in einem ersten Betriebsmodus ein flüssiger Kraftstoff wie Diesel und in einem zweiten Betriebsmodus ein gasförmiger Kraftstoff wie Methan verbrannt werden kann. Die Zylinder eines Gasmotors bzw. die Zylinder eines Dual-Fuel-Motors sind typischerweise in mindestens einer Gruppe aus mehreren in einer Reihe positionierten Zylindern angeordnet. Jeder Gruppe aus in einer Reihe positionierten Zylindern kann der gasförmige Kraftstoff über eine zylindergruppenindividuelle Kraftstoffzuführleitung zugeführt werden, wobei von der zylindergruppenindividuellen Kraftstoffzuführleitung zylinderindividuelle Kraftstoffzuführleitungen abzweigen, welche die jeweiligen Zylinder einer Gruppe an die zylindergruppenindividuelle Kraftstoffzuführleitung anbinden. The basic structure and the basic mode of operation of an internal combustion engine designed as a gas engine or as a dual-fuel engine are familiar to the person skilled in the art. Thus, a gas engine typically has multiple cylinders in which only gaseous fuel, such as methane, is burned. A dual-fuel engine also typically has multiple cylinders in which, in a first mode of operation, a liquid fuel such as diesel and in a second mode of operation a gaseous fuel such as methane may be burned. The cylinders of a gas engine and the cylinders of a dual-fuel engine are typically arranged in at least one group of a plurality of cylinders positioned in a row. The gaseous fuel can be supplied to each group of cylinders positioned in a row via a cylinder-group-specific fuel supply line, wherein cylinder-individual fuel supply lines branch off from the cylinder-group-specific fuel supply line and connect the respective cylinders of a group to the cylinder-group-specific fuel supply line.
Bei einem Gasmotor ist die zylindergruppenindividuelle Kraftstoffzuführleitung in einem regulären Betrieb stets mit gasförmigem Kraftstoff befüllt, und zwar auch dann, wenn der Gasmotor stillgesetzt ist. Zur Ausführung von Wartungsarbeiten wird jedoch die zylindergruppenindividuelle Kraftstoffzuführleitung entlüftet, sodass zum nachfolgenden Start des Gasmotors die jeweilige zylindergruppenindividuelle Kraftstoffzuführleitung mit gasförmigem Kraftstoff befüllt werden muss. In a gas engine, the cylinder group-specific fuel supply line is always filled in a regular operation with gaseous fuel, even if the gas engine is stopped. However, to carry out maintenance work, the cylinder-group-specific fuel supply line is vented, so that the respective cylinder-group-specific fuel supply line must be filled with gaseous fuel for the subsequent start of the gas engine.
Bei einem Dual-Fuel-Motor ist die zylindergruppenindividuelle Kraftstoffzuführleitung nur dann mit gasförmigem Kraftstoff befüllt, wenn in den Zylindern tatsächlich gasförmiger Kraftstoff verbrannt wird. Wird in den Zylindern eines Dual-Fuel-Motors hingegen flüssiger Kraftstoff, wie zum Beispiel Diesel, verbrannt, so ist die jeweilige zylindergruppenindividuelle Kraftstoffzuführleitung für den gasförmigen Kraftstoff entlüftet und insbesondere mit Luft oder Inertgas befüllt. Um ausgehend von einem Betriebsmodus des Dual-Fuel-Motors, in welchem im Dual-Fuel-Motor flüssiger Kraftstoff verbrannt wird, in einen Betriebsmodus zu wechseln, in welchem im Dual-Fuel-Motor gasförmiger Kraftstoff verbrannt wird, muss die jeweilige zylindergruppenindividuelle Kraftstoffzuführleitung mit gasförmigem Kraftstoff definiert befüllt werden. Gleiche Situation liegt vor, falls ein Dual-Fuel-Motor mit gasförmigen Kraftstoff gestartet werden soll. In a dual-fuel engine, the cylinder group-specific fuel supply line is filled with gaseous fuel only when gaseous fuel is actually burned in the cylinders. On the other hand, if liquid fuel such as diesel is burnt in the cylinders of a dual-fuel engine, the respective cylinder-group-specific fuel feed line for the gaseous fuel is vented and in particular filled with air or inert gas. In order to change from an operating mode of the dual-fuel engine, in which liquid fuel is combusted in the dual-fuel engine, into an operating mode in which gaseous fuel is burned in the dual-fuel engine, the respective cylinder group-specific fuel supply line with gaseous fuel defined to be filled. The same situation exists if a dual-fuel engine with gaseous fuel is to be started.
Bislang bereitet es Schwierigkeiten, einen Gasmotor nach Ausführung von Wartungsarbeiten bei vom gasförmigem Kraftstoff entleerter Kraftstoffzuführleitung sowie einem Dual-Fuel-Motor bei Wechsel vom Flüssigkraftstoff-Betriebsmodus in den Gaskraftstoff-Betriebsmodus ordnungsgemäß zu starten. Es besteht daher Bedarf an einem Verfahren zur Startvorbereitung einer als Gasmotor oder einer als Dual-Fuel-Motor ausgebildeten Brennkraftmaschine, mit Hilfe dessen dann, wenn die jeweilige zylindergruppenindividuelle Kraftstoffzuführleitung für den gasförmigen Kraftstoff vom gasförmigen Kraftstoff entleert ist, der Gasmotor oder der Dual-Fuel-Motor mit dem gasförmigen Kraftstoff sicher und zuverlässig gestartet werden kann. So far, it has been difficult to properly start a gas engine after performing maintenance work on the fuel supply line exhausted from the gaseous fuel and a dual-fuel engine when switching from the liquid fuel operation mode to the gaseous fuel operation mode. There is therefore a need for a method for starting preparation of a gas engine designed as a dual-engine or engine, with the aid of which, if the respective cylinder group-specific fuel supply for the gaseous fuel is emptied from the gaseous fuel, the gas engine or the dual-fuel -Motor can be safely and reliably started with the gaseous fuel.
Hiervon ausgehend liegt der vorliegenden Erfindung die Aufgabe zugrunde, ein neuartiges Verfahren zur Startvorbereitung einer als Gasmotor oder Dual-Fuel-Motor ausgebildeten Brennkraftmaschine zu schaffen. On this basis, the present invention has the object to provide a novel method for starting preparation of a designed as a gas engine or dual-fuel engine internal combustion engine.
Diese Aufgabe wird durch ein Verfahren nach Anspruch 1 gelöst. This object is achieved by a method according to claim 1.
In einem Schritt a) wird zunächst die jeweilige vom gasförmigen Kraftstoff entleerte und insbesondere mit Umgebungsluft oder Inertgas befüllte, zylindergruppenindividuelle Kraftstoffzuführleitung durch Öffnen eines zylindergruppenindividuellen Kraftstoffzuführventils mit dem gasförmigen Kraftstoff definiert befüllt und hierbei überwacht, ob nach Schließen des zylindergruppenindividuellen Kraftstoffzuführventils ein in der jeweiligen zylindergruppenindividuellen Kraftstoffzuführleitung herrschender Druck für eine definierte Zeitdauer in einem definierten Druckbereich liegt. Dann, wenn in Schritt a) festgestellt wird, dass der in der jeweiligen zylindergruppenindividuellen Kraftstoffzuführleitung herrschende Druck für die definierte Zeitdauer in dem definierten Druckbereich liegt, wird in einem nachfolgenden Schritt b) durch Öffnen und nachfolgendes Schließen eines zylinderindividuellen Kraftstoffzuführventils, welches dem in der Gruppe letzten Zylinder in Gasflussrichtung oder der jeweiligen zylinderindividuellen Kraftstoffzuführleitung des in der Gruppe letzten Zylinders zugeordnet ist, der gasförmige Kraftstoff gleichförmig in der jeweiligen zylindergruppenindividuellen Kraftstoffzuführleitung verteilt. In einem nachfolgenden Schritt c) kann die Brennkraftmaschine mit gasförmigem Kraftstoff gestartet werden. Mit dem erfindungsgemäßen Verfahren wird die jeweilige zylindergruppenindividuelle Kraftstoffzuführleitung zunächst in dem Schritt a) einer Dichtigkeitsprüfung unterzogen. Nur dann, wenn in Schritt a) festgestellt wird, dass die jeweilige zylindergruppenindividuelle Kraftstoffzuführleitung dicht ist, wird in einem nachfolgenden Schritt b) der gasförmige Kraftstoff in der jeweiligen zylindergruppenindividuelle Kraftstoffzuführleitung gleichförmig verteilt und im Anschluss hieran mit Abschluss der Startvorbereitung in einem nachfolgendem Schritt c) die Brennkraftmaschine mit gasförmigem Kraftstoff gestartet. In a step a), the respective cylinder-group-specific fuel supply line emptied of gaseous fuel and filled in particular with ambient air or inert gas is filled by opening a cylinder-group-specific fuel supply valve with the gaseous fuel and monitored, whether after closing of the cylinder-group-specific fuel supply valve, an individual fuel supply line in the respective cylinder group prevailing pressure for a defined period of time in a defined pressure range. Then, if it is determined in step a) that the pressure prevailing in the respective cylinder group-specific fuel supply line for the defined period of time in the defined pressure range, in a subsequent step b) by opening and subsequently closing a cylinder-individual Kraftstoffzuführventils, which in the group the last cylinder in the gas flow direction or the respective cylinder-specific fuel supply line of the last cylinder in the group is distributed, the gaseous fuel uniformly in the respective cylinder group-individual fuel supply. In a subsequent step c), the internal combustion engine can be started with gaseous fuel. With the method according to the invention, the respective cylinder group-specific fuel supply line is first subjected to a leak test in step a). Only if it is determined in step a) that the respective cylinder group-specific fuel supply line is tight, is in a following step b), the gaseous fuel is uniformly distributed in the respective cylinder group-specific fuel supply line, and subsequently the gaseous fuel is started with completion of the startup preparation in a subsequent step c).
Vorzugsweise wird dann, wenn in Schritt a) festgestellt wird, dass der in der zylindergruppenindividuellen Kraftstoffzuführleitung herrschende Druck nicht für die definierte Zeitdauer in dem definierten Druckbereich liegt, die Startvorbereitung abgebrochen. Wird in Schritt a) eine Undichtigkeit der jeweiligen zylindergruppenindividuellen Kraftstoffzuführleitung festgestellt, so wird die Startvorbereitung abgebrochen und die Brennkraftmaschine nachfolgend nicht mit gasförmigem Kraftstoff gestartet. Preferably, if it is determined in step a) that the pressure prevailing in the cylinder group-specific fuel supply line pressure is not in the defined pressure range for the defined period of time, the start preparation is aborted. If a leakage of the respective cylinder group-specific fuel supply line is detected in step a), then the start preparation is aborted and the internal combustion engine is not subsequently started with gaseous fuel.
Nach einer vorteilhaften Weiterbildung wird in Schritt b) durch mehrfach hintereinander folgendes Öffnen und Schließen des jeweiligen zylinderindividuellen Kraftstoffzuführventils der Druck in der jeweiligen zylindergruppenindividuellen Kraftstoffzuführleitung mit einem definierten Soll-Gradienten abgesenkt. Ein sich hierbei ausbildender Ist-Gradient wird ermittelt und mit dem Soll-Gradienten verglichen, wobei dann, wenn der Ist-Gradient um mehr als einen Schwellwert vom Soll-Gradienten abweicht, auf einen verklemmtes zylinderindividuelles Kraftstoffzuführventil geschlossen und die Startvorbereitung abgebrochen wird. Nur dann, wenn der Ist-Gradient nicht um mehr als den Schwellwert vom Soll-Gradienten abweicht, wird in dem nachfolgenden Schritt c) die Brennkraftmaschine mit gasförmigem Kraftstoff gestartet. Es kann überprüft werden, ob das in der jeweiligen Reihe dem jeweiligen letzten Zylinder zugeordnete, zylinderindividuelle Kraftstoffzuführventil blockiert ist. In diesem Fall wird dann die Startvorbereitung abgebrochen und die jeweilige Brennkraftmaschine nicht gestartet. According to an advantageous development, the pressure in the respective cylinder group-individual fuel supply line is lowered by a defined desired gradient in step b) by repeatedly opening and closing the respective cylinder-individual fuel supply valve. An actual gradient developing in this case is determined and compared with the desired gradient, in which case when the actual gradient deviates by more than a threshold value from the setpoint gradient, a jammed cylinder-specific fuel supply valve is closed and the startup preparation is aborted. Only if the actual gradient does not differ by more than the threshold value from the setpoint gradient, in the subsequent step c) is the engine started with gaseous fuel. It can be checked whether the cylinder-specific fuel supply valve assigned in the respective row to the respective last cylinder is blocked. In this case, then the start preparation is canceled and the respective internal combustion engine is not started.
Bevorzugte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung. Ausführungsbeispiele der Erfindung werden, ohne hierauf beschränkt zu sein, an Hand der Zeichnung näher erläutert. Dabei zeigt: Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:
Die Erfindung betrifft ein Verfahren zur Startvorbereitung einer als Gasmotor ausgebildeten Brennkraftmaschine oder einer als Dual-Fuel-Motor ausgebildeten Brennkraftmaschine sowie vorzugsweise zum nachfolgenden Starten der Brennkraftmaschine mit einem gasförmigen Kraftstoff. The invention relates to a method for starting preparation of a designed as a gas engine internal combustion engine or designed as a dual-fuel engine internal combustion engine and preferably for subsequent starting of the internal combustion engine with a gaseous fuel.
Das erfindungsgemäße Verfahren wird nachfolgend unter Bezugnahme auf
Die in
Gemäß
Die hier vorliegende Erfindung betrifft nun solche Details eines Verfahrens zur Startvorbereitung sowie ggf. zum nachfolgenden Starten einer solchen Brennkraftmaschine, in welcher die Brennkraftmaschine mit dem gasförmigen Kraftstoff sicher und zuverlässig gestartet werden kann. The present invention relates now to such details of a method for starting preparation and possibly for the subsequent starting of such an internal combustion engine, in which the Internal combustion engine can be safely and reliably started with the gaseous fuel.
In einem ersten Schritt a) des erfindungsgemäßen Verfahrens zur Startvorbereitung wird zunächst die von dem gasförmigen Kraftstoff entleerte und mit Luft und/oder Inertgas befüllte, zylindergruppenindividuelle Kraftstoffzuführleitung
Nach dem Schließen des zylindergruppenindividuellen Kraftstoffzuführventils
Dann, wenn in Schritt a) festgestellt wird, dass der in der zylindergruppenindividuellen Kraftstoffzuführleitung
Hiermit ist die eigentliche Startvorbereitung abgeschlossen und in einem nachfolgenden dritten Schritt c) kann dann die Brennkraftmaschine
Dann, wenn in dem ersten Schritt a) festgestellt wird, dass nach dem definierten Befüllen der zylindergruppenindividuellen Kraftstoffzuführleitung
In dem zweiten Schritt b), in welchem der gasförmige Kraftstoff gleichförmigen in der zylindergruppenindividuellen Kraftstoffzuführleitung
In diesem zweiten Schritt b) wird vorzugsweise durch mehrfaches getaktetes hintereinander folgendes Öffnen und Schließen des zylinderindividuellen Kraftstoffzuführventils
Ein sich hierbei ausbildender Ist-Gradient wird ermittelt und mit dem Soll-Gradienten verglichen, wobei dann, wenn der Ist-Gradient um mehr als einen Schwellwert vom Soll-Gradienten abweicht, auf ein verklemmtes zylinderindividuelles Kraftstoffzuführventil
Mit der Erfindung wird demnach im Schritt a) ein definierter Leckagetest durchgeführt, um zu überprüfen, ob die zu einer Gruppe
Dann hingegen, wenn der Leckagetest erfolgreich war, also keine Dichtigkeitsprobleme im Kraftstoffversorgungssystem für den gasförmigen Kraftstoff erkannt werden, wird mit der Startvorbereitung fortgefahren und in einem Schritt b) der gasförmige Kraftstoff durch Öffnen des Kraftstoffzuführventils
Sollte sich während des Schritts b) herausstellen, dass das dem letzten Zylinder
Bei einer Brennkraftmaschine
BezugszeichenlisteLIST OF REFERENCE NUMBERS
- 10 10
- Brennkraftmaschine Internal combustion engine
- 11 11
- Gruppe group
- 12 12
- Zylinder cylinder
- 13 13
- zylindergruppenindividuelle Kraftstoffzuführleitung cylinder group-specific fuel supply line
- 14 14
- zylinderindividuelle Kraftstoffzuführleitung cylinder-specific fuel supply line
- 15 15
- zylindergruppenindividuelles Kraftstoffzuführventil cylinder group-specific fuel supply valve
- 16 16
- zylinderindividuelles Kraftstoffzuführventil cylinder-specific fuel supply valve
- 17 17
- Entlüftungsventil vent valve
- 18 18
- Drucksensor pressure sensor
Claims (7)
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DE102016118976.6A DE102016118976A1 (en) | 2016-10-06 | 2016-10-06 | Method for starting preparation and preferably for the subsequent starting of a designed as a gas engine or dual-fuel engine internal combustion engine |
KR1020170124898A KR102341738B1 (en) | 2016-10-06 | 2017-09-27 | Method for the start preparation and preferentially for the subsequent starting of an internal combustion engine designed as gas engine or dual-fuel engine |
CN201710906049.7A CN107917002A (en) | 2016-10-06 | 2017-09-29 | Startup for explosive motor prepares and the method for subsequent start-up |
FI20175871A FI20175871A (en) | 2016-10-06 | 2017-10-03 | Process for preparing start and preferably for then starting an internal combustion engine formed as a gas engine or as a dual fuel engine |
JP2017194912A JP6979842B2 (en) | 2016-10-06 | 2017-10-05 | Methods for start-up preparation, and preferably subsequent start-up, of internal combustion engines designed as gas engines or Type 2 fuel engines. |
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CN107917002A (en) | 2018-04-17 |
JP6979842B2 (en) | 2021-12-15 |
KR102341738B1 (en) | 2021-12-20 |
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