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EP2054589B1 - Pressure control valve, crankcase ventilating device and method for operating the latter - Google Patents

Pressure control valve, crankcase ventilating device and method for operating the latter Download PDF

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Publication number
EP2054589B1
EP2054589B1 EP07802232A EP07802232A EP2054589B1 EP 2054589 B1 EP2054589 B1 EP 2054589B1 EP 07802232 A EP07802232 A EP 07802232A EP 07802232 A EP07802232 A EP 07802232A EP 2054589 B1 EP2054589 B1 EP 2054589B1
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EP
European Patent Office
Prior art keywords
valve
crankcase
internal combustion
combustion engine
pressure control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP07802232A
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German (de)
French (fr)
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EP2054589A1 (en
Inventor
Wolfram Enke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication date
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Publication of EP2054589A1 publication Critical patent/EP2054589A1/en
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Publication of EP2054589B1 publication Critical patent/EP2054589B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/0011—Breather valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/0011—Breather valves
    • F01M2013/0016—Breather valves with a membrane
    • 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
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement

Definitions

  • the invention relates to a crankcase ventilation device, comprising a pressure control valve for a crankcase ventilation of an internal combustion engine with a valve housing, a valve diaphragm and a valve spring.
  • crankcase vents are provided, via which a pressure equalization can take place by gases escape from the crankcase and can be returned to the intake system of the internal combustion engine. It is also known to arrange a pressure control valve in the region between the crankcase and the intake system in order to control the outflow of crankcase gases into the intake system.
  • crankcase ventilation device for example, goes DE-OS 1 526 575 and describes a the control valve upstream check valve, which closes the connection to the crankcase in the event of a misfire of the internal combustion engine due to the increased pressure in the intake system. In this way, a continuation of the pressure wave is prevented in the crankcase.
  • the situation is completely different in the case of gas-powered, in particular hydrogen-powered, internal combustion engines.
  • the fuel in combination with air has a very high ignitability over a wide range, so that in the case of a misfire of the internal combustion engine, a propagation of the flame front through the crankcase ventilation into the crankcase and there the ignition of a larger amount of ignitable mixture is possible.
  • Another aspect related to gas-powered internal combustion engines relates to the possible accumulation of fuel (vapor) in the intake system, especially during the Internal combustion engine is not in operation, with the result of a very high probability of ignition during the subsequent start of the internal combustion engine.
  • Such accumulation of fuel in the intake system may for example be due to an increased amount of blow-by gases or a defect in the fuel supply.
  • the US 3,262,436 relates to means for regulating the pressure in an engine crankcase with a pressure control valve and a check valve for locking the pressure control valve at standstill and when starting the internal combustion engine to improve the starting behavior of the internal combustion engine.
  • a pressure control valve and a check valve for locking the pressure control valve at standstill and when starting the internal combustion engine to improve the starting behavior of the internal combustion engine.
  • an active locking of the pressure control valve is not possible.
  • the object of the invention is to effectively prevent the ignition of a combustible fuel / air mixture in the intake system and / or a flashback on the crankcase ventilation in the crankcase, starting from the cylinder inlet of a particular hydrogen-powered internal combustion engine.
  • the propagation of the flame front should be prevented by the crankcase ventilation in the crankcase.
  • the possibility of accumulation of fuel in the intake system should already be avoided.
  • the vent volume flow of the crankcase ventilation device should not be affected during operation of the internal combustion engine.
  • an active blocking of the pressure regulating valve should be made possible in the case of critical states.
  • crankcase ventilation device with the features of claim 1, by a vacuum pump is provided for evacuation of the separate room.
  • crankcase ventilation device with a pressure control valve for a crankcase ventilation of an internal combustion engine with a valve housing, a valve diaphragm and a valve spring, wherein a separate check valve is provided to block the pressure control valve, to evacuate the separate room to provide a vacuum pump and to switch the vacuum pump to use an energizable electric switching valve, which is not evacuated when energized Elektroumschaltventil the separate room and is evacuated when energized Elektroumschaltventil the separate room.
  • a common negative pressure pump is provided in a crankcase ventilation device with a plurality of pressure control valves for evacuating the separate spaces of the pressure control valves.
  • FIG. 1 shows a crankcase ventilation device 100 with vacuum actuated shut-off valves 102, 104, a vacuum pump 106 and a Elektroumschaltventil 108.
  • the present crankcase ventilation device 100 is suitable for use in an internal combustion engine shown here with two cylinder groups, each having a separate intake system, for example, a V12 Cylinder internal combustion engine.
  • crankcase ventilation gases are fed in two places by the shut-off valve 102nd a first and the check valve 104 is associated with a second intake system.
  • the crankcase ventilation device according to the invention may also include only one shut-off valve, for example when crankcase ventilation gases are to be fed into the intake system at only one location, or comprise more than two shut-off valves.
  • Shut-off valves 102, 104, vacuum pump 106 and electric switching valve 108 are connected to pressure lines 110.
  • a vacuum actuatable shut-off valve 200 for crankcase ventilation is disclosed in US Pat FIG. 2 shown in section.
  • a partially concealed inlet port 202 in the present view serves to connect the shut-off valve 200 with a vent opening in the crankcase of the internal combustion engine.
  • the shut-off valve 200 is attached to a connection surface 218 of the valve housing 204 on an intake system of the internal combustion engine, not shown here, wherein an outlet port 210 protrudes through an inlet opening in the intake system in the intake air leading portion of the intake, so starting from the inlet port 202 on the within the Valve housing 204 formed between the valve housing 204 and a valve diaphragm 206 space and the nozzle 210 crankcase ventilation gases are fed to the intake system.
  • a negative pressure prevails in the intake system, while blow-by gases increase the pressure in the crankcase.
  • the intake system is connected in a gas-conducting manner with the crankcase, a predetermined negative pressure can also be achieved in the crankcase.
  • there is a regulation of the negative pressure in the crankcase by means of the check valve 200 with the valve diaphragm 206, which cooperates with the stop valve side, lying in the valve housing 204 opening of the outlet nozzle 210.
  • valve membrane 206 is acted upon by the force of a housing side supporting valve spring 205 in the opening direction.
  • the valve diaphragm 206 by the force of a locking spring 220 with the interposition of a barrier membrane 212, which is supported on the valve diaphragm 206 on the one hand and on the locking spring 220 on the other hand, acted upon.
  • the force of the locking spring 220 exceeds the force of the valve spring 205 such that when the locking spring force is fully effective, the shut-off valve 200 is locked and also a possible negative pressure in the crankcase and / or overpressure in the intake system remains securely closed.
  • a separate enclosed space 214 is formed within the valve housing 204, which is accessible via an opening with nozzle 216 to the outside and evacuated.
  • the barrier diaphragm is depressed against the force of the valve spring 220, thus reducing the barrier spring force acting on the valve diaphragm 206.
  • the valve membrane 206 moves in Opening direction and releases the vent line between intake and crankcase.
  • crankcase pressure is controlled as usual, by shifting the valve diaphragm 206 against the force of the valve spring 205 towards the valve seat and thus the passage cross-section for a lower pressure in the intake system compared to the pressure in the crankcase crankcase ventilation gases reduced. If the negative pressure in the intake system is too large, the valve diaphragm 206 closes the passage for crankcase ventilation gases for a short time.
  • An evacuation of the space 214 takes place by means of the vacuum pump 106, which is connected by means of pressure lines 110 to the shut-off valves 102, 104 and for the control of which the electrical switching valve 108 is provided.
  • the vacuum pump 106 is turned on when opening the crankcase ventilation is safe in terms of safety, otherwise - in critical phases, especially at start and at standstill of the engine - the vacuum pump 106 is turned off, thus blocking the crankcase ventilation.
  • FIG. 3 shows an intake system 302 of a hydrogen-powered V12 cylinder internal combustion engine 300 with a vacuum-actuable shut-off valve 304 in the installed position.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Description

Die Erfindung betrifft eine Kurbelgehäuseentlüftungseinrichtung, umfassend ein Druckregelventil für eine Kurbelgehäuseentlüftung einer Brennkraftmaschine mit einem Ventilgehäuse, einer Ventilmembran und einer Ventilfeder.The invention relates to a crankcase ventilation device, comprising a pressure control valve for a crankcase ventilation of an internal combustion engine with a valve housing, a valve diaphragm and a valve spring.

Während des Betriebs von Brennkraftmaschinen können aufgrund der nicht absoluten Dichtheit der Brennräume im Bereich der Kolbenringe Gase (Blow-by-Gase) in das Kurbelgehäuse entweichen. Um einen übermäßigen Druckanstieg im Kurbelgehäuse zu verhindern, sind üblicherweise Kurbelgehäuseentlüftungen vorgesehen, über welche ein Druckausgleich erfolgen kann, indem Gase aus dem Kurbelgehäuse entweichen und in das Ansaugsystem der Brennkraftmaschine rückgeführt werden können. Bekannt ist es ferner, im Bereich zwischen Kurbelgehäuse und Ansaugsystem ein Druckregelventil anzuordnen, um den Abstrom von Kurbelgehäusegasen in das Ansaugsystem zu regeln.During the operation of internal combustion engines, gases (blow-by gases) can escape into the crankcase due to the non-absolute tightness of the combustion chambers in the region of the piston rings. In order to prevent an excessive increase in pressure in the crankcase, usually crankcase vents are provided, via which a pressure equalization can take place by gases escape from the crankcase and can be returned to the intake system of the internal combustion engine. It is also known to arrange a pressure control valve in the region between the crankcase and the intake system in order to control the outflow of crankcase gases into the intake system.

Von einer derartigen Kurbelgehäuseentlüftungseinrichtung geht beispielsweise die DE-OS 1 526 575 aus und beschreibt ein dem Regelventil ansaugsystemseitig vorgeordnetes Rückschlagventil, welches im Falle einer Fehlzündung der Brennkraftmaschine aufgrund des erhöhten Druckes im Ansaugsystem die Verbindung zum Kurbelgehäuse schließt. Auf diese Weise wird eine Fortsetzung der Druckwelle in das Kurbelgehäuse verhindert.From such a crankcase ventilation device, for example, goes DE-OS 1 526 575 and describes a the control valve upstream check valve, which closes the connection to the crankcase in the event of a misfire of the internal combustion engine due to the increased pressure in the intake system. In this way, a continuation of the pressure wave is prevented in the crankcase.

In Verbindung mit einer kohlenwasserstoff-, insbesondere benzin- oder dieselbetriebenen Brennkraftmaschine erscheint die offenbarte Anordnung zweckmäßig, keinesfalls jedoch, wenn die Brennkraftmaschine gas-, insbesondere wasserstoffbetrieben ist.In conjunction with a hydrocarbon, especially gasoline or diesel-powered internal combustion engine, the disclosed arrangement appears expedient, but in no case, when the internal combustion engine is gas, especially hydrogen-powered.

Bei benzin- oder dieselbetriebenen Brennkraftmaschine erfolgt bei Fehlzündungen der Brennkraftmaschine ein Flammenrückschlag ausgehend vom Zylindereinlass in Richtung Ansaugsystem, wobei sich eine Druckwelle auch durch die Kurbelgehäuseentlüftung in Richtung Kurbelgehäuse ausbreitet; die Flammenfront selbst kommt zylindereinlassseitig relativ bald zum Erlöschen, da weder im Ansaugsystem noch im Kurbelgehäuse ein zündfähiges Gasgemisch vorliegt. Dies ist insbesondere auf die relativ engen Zündgrenzen des Kraftstoff/Luft-Gemisches zurückzuführen.In gasoline or diesel-powered internal combustion engine takes place at misfires of the internal combustion engine, a flashback starting from the cylinder inlet in the direction of the intake system, with a pressure wave also propagates through the crankcase ventilation towards the crankcase; The flame front itself comes to the cylinder inlet side relatively soon to extinguish, since neither in the intake system nor in the crankcase an ignitable gas mixture is present. This is due in particular to the relatively narrow ignition limits of the fuel / air mixture.

Vollkommen anders stellt sich die Situation bei gas-, insbesondere wasserstoffbetriebenen Brennkraftmaschinen dar. Der Kraftstoff weist in Verbindung mit Luft eine sehr hohe Zündfähigkeit in weiten Bereichen auf, sodass im Falle einer Fehlzündung der Brennkraftmaschine eine Ausbreitung der Flammenfront durch die Kurbelgehäuseentlüftung in das Kurbelgehäuse und dort die Entzündung einer größeren Menge zündfähigen Gemisches möglich ist.The situation is completely different in the case of gas-powered, in particular hydrogen-powered, internal combustion engines. The fuel in combination with air has a very high ignitability over a wide range, so that in the case of a misfire of the internal combustion engine, a propagation of the flame front through the crankcase ventilation into the crankcase and there the ignition of a larger amount of ignitable mixture is possible.

Ein weiterer Aspekt in Zusammenhang mit gasbetriebenen Brennkraftmaschinen betrifft die mögliche Ansammlung von Kraftstoff(dämpfen) im Ansaugsystem, insbesondere während die Brennkraftmaschine nicht in Betrieb ist, mit der Folge einer sehr hohen Entzündungswahrscheinlichkeit beim nachfolgenden Start der Brennkraftmaschine. Eine derartige Ansammlung von Kraftstoff im Ansaugsystem kann beispielsweise auf eine erhöhte Menge an Blow-by-Gasen oder einen Defekt in der Kraftstoffzuführung zurückgehen.Another aspect related to gas-powered internal combustion engines relates to the possible accumulation of fuel (vapor) in the intake system, especially during the Internal combustion engine is not in operation, with the result of a very high probability of ignition during the subsequent start of the internal combustion engine. Such accumulation of fuel in the intake system may for example be due to an increased amount of blow-by gases or a defect in the fuel supply.

Die US 3,262,436 betrifft Einrichtung zum Regulieren des Druckes in einem Brennkraftmaschinen-Kurbelgehäuse mit einem Druckregelventil und einem Sperrventil zum Sperren des Druckregelventils bei Stillstand sowie beim Starten der Brennkraftmaschine, um das Startverhalten der Brennkraftmaschine zu verbessern. Bei dieser bekannten Einrichtung ist jedoch ein aktives Sperren des Druckregelventils nicht möglich.The US 3,262,436 relates to means for regulating the pressure in an engine crankcase with a pressure control valve and a check valve for locking the pressure control valve at standstill and when starting the internal combustion engine to improve the starting behavior of the internal combustion engine. In this known device, however, an active locking of the pressure control valve is not possible.

Aufgabe der Erfindung ist es, die Entzündung eines brennbaren Kraftstoff/Luft-Gemisches im Ansaugsystem und/oder einen Flammenrückschlag über die Kurbelgehäuseentlüftung in das Kurbelgehäuse ausgehend vom Zylindereinlass einer insbesondere wasserstoffbetriebenen Brennkraftmaschine wirksam zu verhindern. Im Falle einer Fehlzündung der Brennkraftmaschine soll die Ausbreitung der Flammenfront durch die Kurbelgehäuseentlüftung in das Kurbelgehäuse verhindert werden. Alternativ oder zusätzlich soll bereits die Möglichkeit der Ansammlung von Kraftstoff im Ansaugsystem vermieden werden. Insbesondere soll gleichzeitig der Entlüftungsvolumenstrom der Kurbelgehäuseentlüftungseinrichtung beim Betrieb der Brennkraftmaschine nicht beeinträchtigt werden. Dafür soll bei kritischen Zuständen ein aktives Sperren des Druckregelventils ermöglicht werden.The object of the invention is to effectively prevent the ignition of a combustible fuel / air mixture in the intake system and / or a flashback on the crankcase ventilation in the crankcase, starting from the cylinder inlet of a particular hydrogen-powered internal combustion engine. In the case of a misfire of the internal combustion engine, the propagation of the flame front should be prevented by the crankcase ventilation in the crankcase. Alternatively or additionally, the possibility of accumulation of fuel in the intake system should already be avoided. In particular, at the same time the vent volume flow of the crankcase ventilation device should not be affected during operation of the internal combustion engine. For this purpose, an active blocking of the pressure regulating valve should be made possible in the case of critical states.

Die Lösung der Aufgabe erfolgt mit einer Kurbelgehäuseentlüftungseinrichtung mit den Merkmalen des Anspruchs 1, indem zur Evakuierung des gesonderten Raumes eine Unterdruckpumpe vorgesehen ist.The object is achieved with a crankcase ventilation device with the features of claim 1, by a vacuum pump is provided for evacuation of the separate room.

Besonders vorteilhafte Ausgestaltungen und Weiterbildungen sind Gegenstand der Unteransprüche.Particularly advantageous embodiments and further developments are the subject of the dependent claims.

Es hat sich bewährt, bei einer Kurbelgehäuseentlüftungseinrichtung mit einem Druckregelventil für eine Kurbelgehäuseentlüftung einer Brennkraftmaschine mit einem Ventilgehäuse, einer Ventilmembran und einer Ventilfeder, wobei ein gesondertes Sperrventil zum Sperren des Druckregelventils vorgesehen ist, zur Evakuierung des gesonderten Raumes eine Unterdruckpumpe vorzusehen und zum Schalten der Unterdruckpumpe ein bestrombares Elektroumschaltventil zu verwenden, wobei bei unbestromtem Elektroumschaltventil der gesonderter Raum nicht evakuiert und bei bestromtem Elektroumschaltventil der gesonderter Raum evakuiert wird.It has proven useful in a crankcase ventilation device with a pressure control valve for a crankcase ventilation of an internal combustion engine with a valve housing, a valve diaphragm and a valve spring, wherein a separate check valve is provided to block the pressure control valve, to evacuate the separate room to provide a vacuum pump and to switch the vacuum pump to use an energizable electric switching valve, which is not evacuated when energized Elektroumschaltventil the separate room and is evacuated when energized Elektroumschaltventil the separate room.

Vorzugsweise ist bei einer Kurbelgehäuseentlüftungseinrichtung mit mehreren Druckregelventilen zur Evakuierung der gesonderten Räume der Druckregelventile eine gemeinsame Unterdruckpumpe vorgesehen.Preferably, a common negative pressure pump is provided in a crankcase ventilation device with a plurality of pressure control valves for evacuating the separate spaces of the pressure control valves.

Nachfolgend wird unter Bezugnahme auf Figuren ein besonders zu bevorzugendes Ausführungsbeispiel der Erfindung näher erläutert, dabei zeigen schematisch und beispielhaft

Figur 1
eine Kurbelgehäuseentlüftungseinrichtung mit unterdruckbetätigbaren Absperrventilen, einer Unterdruckpumpe sowie einem Elektroumschaltventil,
Figur 2
ein unterdruckbetätigbares Absperrventil für eine Kurbelgehäuseentlüftung im Schnitt und
Figur 3
ein Ansaugsystem einer Brennkraftmaschine mit einem unterdruckbetätigbaren Absperrventil.
Hereinafter, with reference to figures, a particularly preferred embodiment of the invention will be explained in more detail, show schematically and by way of example
FIG. 1
a crankcase ventilation device with vacuum-actuatable shut-off valves, a vacuum pump and an electric switching valve,
FIG. 2
a vacuum actuated shut-off valve for a crankcase ventilation in section and
FIG. 3
an intake system of an internal combustion engine with a vacuum actuated shut-off valve.

Figur 1 zeigt eine Kurbelgehäuseentlüftungseinrichtung 100 mit unterdruckbetätigbaren Absperrventilen 102, 104, einer Unterdruckpumpe 106 sowie einem Elektroumschaltventil 108. Die vorliegend dargestellte Kurbelgehäuseentlüftungseinrichtung 100 ist zur Verwendung bei einer hier nicht näher gezeigten Brennkraftmaschine mit zwei Zylindergruppen, die jeweils ein gesondertes Ansaugsystem aufweisen, geeignet, beispielsweise einer V12-Zylinder Brennkraftmaschine. Dabei werden Kurbelgehäuseentlüftungsgase an zwei Stellen eingespeist, indem das Absperrventil 102 einem ersten und das Absperrventil 104 einem zweiten Ansaugsystem zugeordnet ist. Anderen Ausführungsbeispielen zufolge kann die erfindungsgemäße Kurbelgehäuseentlüftungseinrichtung auch nur ein Absperrventil, beispielsweise wenn Kurbelgehäuseentlüftungsgase an nur einer Stelle in das Ansaugsystem eingespeist werden sollen, oder mehr als zwei Absperrventile umfassen. Absperrventile 102, 104, Unterdruckpumpe 106 und Elektroumschaltventil 108 sind mit Druckleitungen 110 verbunden. FIG. 1 shows a crankcase ventilation device 100 with vacuum actuated shut-off valves 102, 104, a vacuum pump 106 and a Elektroumschaltventil 108. The present crankcase ventilation device 100 is suitable for use in an internal combustion engine shown here with two cylinder groups, each having a separate intake system, for example, a V12 Cylinder internal combustion engine. In this case, crankcase ventilation gases are fed in two places by the shut-off valve 102nd a first and the check valve 104 is associated with a second intake system. According to other embodiments, the crankcase ventilation device according to the invention may also include only one shut-off valve, for example when crankcase ventilation gases are to be fed into the intake system at only one location, or comprise more than two shut-off valves. Shut-off valves 102, 104, vacuum pump 106 and electric switching valve 108 are connected to pressure lines 110.

Ein unterdruckbetätigbares Absperrventil 200 für eine Kurbelgehäuseentlüftung ist in Figur 2 im Schnitt dargestellt. Ein in der vorliegenden Ansicht teilweise verdeckter Einlassstutzen 202 dient zur Verbindung des Absperrventils 200 mit einer Entlüftungsöffnung im Kurbelgehäuse der Brennkraftmaschine. In Einbaulage ist das Absperrventil 200 mit einer Anschlussfläche 218 des Ventilgehäuses 204 an einem hier nicht gezeigten Ansaugsystem der Brennkraftmaschine befestigt, wobei ein Auslassstutzen 210 durch eine Einlassöffnung im Ansaugsystem in den Ansaugluft führenden Bereich des Ansaugsystems hineinragt, sodass ausgehend vom Einlassstutzen 202 über den innerhalb des Ventilgehäuses 204 zwischen Ventilgehäuse 204 und einer Ventilmembran 206 gebildeten Raum und den Stutzen 210 Kurbelgehäuseentlüftungsgase dem Ansaugsystem zuführbar sind.A vacuum actuatable shut-off valve 200 for crankcase ventilation is disclosed in US Pat FIG. 2 shown in section. A partially concealed inlet port 202 in the present view serves to connect the shut-off valve 200 with a vent opening in the crankcase of the internal combustion engine. In the installed position, the shut-off valve 200 is attached to a connection surface 218 of the valve housing 204 on an intake system of the internal combustion engine, not shown here, wherein an outlet port 210 protrudes through an inlet opening in the intake system in the intake air leading portion of the intake, so starting from the inlet port 202 on the within the Valve housing 204 formed between the valve housing 204 and a valve diaphragm 206 space and the nozzle 210 crankcase ventilation gases are fed to the intake system.

Beim Betrieb der Brennkraftmaschine herrscht im Ansaugsystem ein Unterdruck vor, während Blow-by-Gase den Druck im Kurbelgehäuse erhöhend wirken. Indem unter Zwischenschaltung des Absperrventils 200 das Ansaugsystem mit dem Kurbelgehäuse gasleitend verbunden ist, kann auch im Kurbelgehäuse ein vorbestimmter Unterdruck erzielt werden. Dabei erfolgt eine Regelung des Unterdrucks im Kurbelgehäuse mittels des Absperrventils 200 mit der Ventilmembran 206, die mit der absperrventilseitigen, im Ventilgehäuse 204 liegenden Öffnung des Auslassstutzens 210 zusammenwirkt.During operation of the internal combustion engine, a negative pressure prevails in the intake system, while blow-by gases increase the pressure in the crankcase. By with the interposition of the check valve 200, the intake system is connected in a gas-conducting manner with the crankcase, a predetermined negative pressure can also be achieved in the crankcase. In this case, there is a regulation of the negative pressure in the crankcase by means of the check valve 200 with the valve diaphragm 206, which cooperates with the stop valve side, lying in the valve housing 204 opening of the outlet nozzle 210.

Die Ventilmembran 206 ist von der Kraft einer sich gehäuseseitig abstützenden Ventilfeder 205 in Öffnungsrichtung beaufschlagt. In Sperrrichtung ist die Ventilmembran 206 von der Kraft einer Sperrfeder 220 unter Zwischenschaltung einer Sperrmembran 212, die sich an der Ventilmembran 206 einerseits und an der Sperrfeder 220 andererseits abstützt, beaufschlagt. Die Kraft der Sperrfeder 220 übersteigt die Kraft der Ventilfeder 205 derart, dass bei voll wirksamer Sperrfederkraft das Absperrventil 200 gesperrt ist und auch einem eventuellen Unterdruck im Kurbelgehäuse und/oder Überdruck im Ansaugsystem sicher geschlossen bleibt.The valve membrane 206 is acted upon by the force of a housing side supporting valve spring 205 in the opening direction. In the reverse direction, the valve diaphragm 206 by the force of a locking spring 220 with the interposition of a barrier membrane 212, which is supported on the valve diaphragm 206 on the one hand and on the locking spring 220 on the other hand, acted upon. The force of the locking spring 220 exceeds the force of the valve spring 205 such that when the locking spring force is fully effective, the shut-off valve 200 is locked and also a possible negative pressure in the crankcase and / or overpressure in the intake system remains securely closed.

Zwischen Sperrmembran 212 und Ventilgehäuse 204 ist innerhalb des Ventilgehäuses 204 ein gesonderter abgeschlossener Raum 214 gebildet, der über eine Öffnung mit Stutzen 216 nach außen zugänglich und evakuierbar ist. Wenn der Raum 214 evakuiert wird, wird die Sperrmembran entgegen der Kraft der Ventilfeder 220 unterdruckkraftbeaufschlagt und so die auf die Ventilmembran 206 wirkende Sperrfederkraft verringert. Sobald die über die Sperrmembran 212 auf die Ventilmembran 206 wirkende Kraft der Sperrfeder 220 unterdruckbedingt soweit reduziert ist, dass sie - unter Berücksichtigung eines eventuelle Über- oder Unterdruckes im Kurbelgehäuse oder im Ansaugsystem - die Kraft der Ventilfeder 205 unterschreitet, verlagert sich die Ventilmembran 206 in Öffnungsrichtung und gibt die Entlüftungsleitung zwischen Ansaugsystem und Kurbelgehäuse frei.Between barrier membrane 212 and valve housing 204, a separate enclosed space 214 is formed within the valve housing 204, which is accessible via an opening with nozzle 216 to the outside and evacuated. When the space 214 is evacuated, the barrier diaphragm is depressed against the force of the valve spring 220, thus reducing the barrier spring force acting on the valve diaphragm 206. As soon as the force of the blocking spring 220 acting on the valve membrane 206 via the barrier membrane 212 is reduced by the negative pressure so that it falls below the force of the valve spring 205, taking into account any overpressure or underpressure in the crankcase or in the intake system, the valve membrane 206 moves in Opening direction and releases the vent line between intake and crankcase.

Wenn die druckausgleichende Verbindung zwischen Ansaugsystem und Kurbelgehäuse geöffnet ist, erfolgt eine Regelung des Kurbelgehäusedruckes wie üblich, indem bei einem gegenüber dem Druck im Kurbelgehäuse geringeren Druck im Ansaugsystem sich die Ventilmembran 206 gegen die Kraft der Ventilfeder 205 zum Ventilsitz hin verlagert und damit den Durchtrittsquerschnitt für Kurbelgehäuseentlüftungsgase verringert. Wird der Unterdruck im Ansaugsystem zu groß, verschließt die Ventilmembran 206 den Durchtritt für Kurbelgehäuseentlüftungsgase kurzzeitig.When the pressure-balancing connection between the intake system and the crankcase is opened, the crankcase pressure is controlled as usual, by shifting the valve diaphragm 206 against the force of the valve spring 205 towards the valve seat and thus the passage cross-section for a lower pressure in the intake system compared to the pressure in the crankcase crankcase ventilation gases reduced. If the negative pressure in the intake system is too large, the valve diaphragm 206 closes the passage for crankcase ventilation gases for a short time.

Eine Evakuierung des Raumes 214 erfolgt mittels der Unterdruckpumpe 106, die mittels Druckleitungen 110 mit den Absperrventilen 102, 104 verbunden und zu deren Ansteuerung das Elektroumschaltventil 108 vorgesehen ist. Die Unterdruckpumpe 106 wird angeschaltet, wenn ein Öffnen der Kurbelgehäuseentlüftung in Hinblick auf die Sicherheit unbedenklich ist, andernfalls - in kritischen Phasen, insbesondere beim Start und bei Stillstand der Brennkraftmaschine - wird die Unterdruckpumpe 106 ausgeschaltet und damit die Kurbelgehäuseentlüftung gesperrt.An evacuation of the space 214 takes place by means of the vacuum pump 106, which is connected by means of pressure lines 110 to the shut-off valves 102, 104 and for the control of which the electrical switching valve 108 is provided. The vacuum pump 106 is turned on when opening the crankcase ventilation is safe in terms of safety, otherwise - in critical phases, especially at start and at standstill of the engine - the vacuum pump 106 is turned off, thus blocking the crankcase ventilation.

Figur 3 zeigt ein Ansaugsystem 302 einer wasserstoffbetrieben V12-Zylinder-Brennkraftmaschine 300 mit einem unterdruckbetätigbaren Absperrventil 304 in Einbauposition. FIG. 3 FIG. 12 shows an intake system 302 of a hydrogen-powered V12 cylinder internal combustion engine 300 with a vacuum-actuable shut-off valve 304 in the installed position.

Mit der vorliegenden Erfindung wird bei gasbetriebenen, insbesondere wasserstoffbetrieben Brennkraftmaschinen eine Beschädigung der Brennkraftmaschine durch Rückzündungen in das Kurbelgehäuse vermieden. Außerdem wird die Wasserstoffmengen, die nach dem Abstellen der Brennkraftmaschine in das Ansaugsystem einströmen kann, reduziert. Damit werden die Auswirkungen bei einer Rückzündung in das Kurbelgehäuse verringert.With the present invention, in the case of gas-operated, in particular hydrogen-powered internal combustion engines, damage to the internal combustion engine due to flashbacks in the crankcase is avoided. In addition, the amounts of hydrogen that can flow into the intake system after stopping the internal combustion engine is reduced. This reduces the effects of backfire into the crankcase.

Claims (3)

  1. A crankcase venting device, comprising a pressure control valve (102, 104, 200, 304) for a crankcase ventilator of an internal combustion engine (300) with a valve housing (204), a valve diaphragm (206) and a valve spring (205), wherein a separate shut-off valve (222) is provided to shut off the pressure control valve (102, 104, 200, 304), characterised in that a vacuum pump (106) is provided to evacuate a separate chamber (214), which is formed between a shut-off diaphragm (212) of the shut-off valve (222) and valve housing (204).
  2. A crankcase venting device according to claim 1, characterised in that an electric switchover valve (108) which can be provided with current is provided to switch the vacuum pump (106), wherein the separate chamber (214) is not evacuated when the electric switchover valve (108) is not provided with current and the separate chamber (214) being evacuated when the electric switchover valve (108) is provided with current.
  3. A crankcase venting device according to claim 1 and claim 2, comprising a plurality of pressure control valves (102, 104, 200, 304) for the crankcase ventilator of the internal combustion engine (300), characterised in that a shared vacuum pump (106) is provided to evacuate the separate chambers (214) of the pressure control valves (102, 104, 200, 304).
EP07802232A 2006-10-30 2007-09-08 Pressure control valve, crankcase ventilating device and method for operating the latter Not-in-force EP2054589B1 (en)

Applications Claiming Priority (2)

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DE102006051062A DE102006051062A1 (en) 2006-10-30 2006-10-30 Pressure control valve, crankcase ventilation device and method for operating the same
PCT/EP2007/007853 WO2008052620A1 (en) 2006-10-30 2007-09-08 Pressure control valve, crankcase ventilating device and method for operating the latter

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EP2054589A1 EP2054589A1 (en) 2009-05-06
EP2054589B1 true EP2054589B1 (en) 2010-04-21

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EP (1) EP2054589B1 (en)
DE (2) DE102006051062A1 (en)
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WO2018210443A1 (en) 2017-05-19 2018-11-22 Deutz Aktiengesellschaft Internal combustion engines with external mixture formation and compensation vessel for avoiding re-ignition
US11326564B2 (en) 2017-05-19 2022-05-10 Deutz Aktiengesellschaft Internal combustion engines with external mixture formation and compensation vessel for avoiding re-ignition

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DE102006051062A1 (en) 2008-05-08
DE502007003537D1 (en) 2010-06-02
US20090205620A1 (en) 2009-08-20
EP2054589A1 (en) 2009-05-06

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