WO2016201473A1 - Pre-chamber gas control system for a combustion engine - Google Patents

Pre-chamber gas control system for a combustion engine Download PDF

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Publication number
WO2016201473A1
WO2016201473A1 PCT/AT2016/050200 AT2016050200W WO2016201473A1 WO 2016201473 A1 WO2016201473 A1 WO 2016201473A1 AT 2016050200 W AT2016050200 W AT 2016050200W WO 2016201473 A1 WO2016201473 A1 WO 2016201473A1
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WO
WIPO (PCT)
Prior art keywords
chamber
line
combustion engine
gas
gas control
Prior art date
Application number
PCT/AT2016/050200
Other languages
German (de)
French (fr)
Inventor
Wolfgang Burkhardt
Original Assignee
Ge Jenbacher Gmbh & Co Og
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Publication date
Application filed by Ge Jenbacher Gmbh & Co Og filed Critical Ge Jenbacher Gmbh & Co Og
Publication of WO2016201473A1 publication Critical patent/WO2016201473A1/en

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Classifications

    • 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
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/10—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder
    • 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
    • F02B19/00—Engines characterised by precombustion chambers
    • 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
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/10—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder
    • F02B19/1019—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder with only one pre-combustion chamber
    • F02B19/1023—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder with only one pre-combustion chamber pre-combustion chamber and cylinder being fed with fuel-air mixture(s)
    • F02B19/1028—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder with only one pre-combustion chamber pre-combustion chamber and cylinder being fed with fuel-air mixture(s) pre-combustion chamber and cylinder having both intake ports or valves, e.g. HONDS CVCC
    • 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
    • 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
    • F02D19/023—Control of components of the fuel supply system to adjust the fuel mass or volume flow
    • 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
    • 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
    • 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
    • F02M21/0233—Details of actuators therefor
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10229—Fluid connections to the air intake system; their arrangement of pipes, valves or the like the intake system acting as a vacuum or overpressure source for auxiliary devices, e.g. brake systems; Vacuum chambers
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow
    • G05D7/01—Control of flow without auxiliary power
    • G05D7/0106—Control of flow without auxiliary power the sensing element being a flexible member, e.g. bellows, diaphragm, capsule
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Definitions

  • Pre-chamber gas control system for an internal combustion engine Pre-chamber gas control system for an internal combustion engine
  • the invention relates to a pre-chamber gas control system for an internal combustion engine with the features of the preamble of claim 1 and an internal combustion engine having the features of the preamble of claim 5.
  • An antechamber gas control system is known, for example, from WO 2014/147978 A1.
  • the task of a pre-chamber gas control line is to meter the necessary for the safe ignition of the main combustion chamber amount of propellant to the chambers connected to the combustion chambers of an internal combustion engine.
  • the actual entry of propellant gas into the prechamber takes place via a passive prechamber gas valve triggered by the differential pressure between prechamber and prechamber gas supply.
  • a pre-chamber gas control In a known from the prior art embodiment of a pre-chamber gas control this has a gas control element, which is fluidically connected via a control line with an intake passage of the internal combustion engine.
  • this control line and the associated gas control element can be taken into account in the metering of propellant gas in the pre-chamber gas line prevailing in the intake manifold boost pressure of the internal combustion engine.
  • Object of the present invention is to provide a comparison with the prior art improved pre-chamber gas control system or internal combustion engine.
  • a Vorhuntgasregelrange with the features of claim 1 and an internal combustion engine with the features of claim 5.
  • at least one branch line is connected to the control line, wherein the length of the at least one branch line a quarter of the wavelength of the fundamental or a predetermined Harmonic of a pressure oscillation in the intake pipe at a predetermined speed of the internal combustion engine, may originate from the intake pressure pressure oscillations in the control line be effectively damped and so the control behavior of Vorschregelset be improved.
  • Lambda c / v with c the speed of sound in the gas and v the frequency of the fundamental, the wavelength lambda of the fundamental are calculated.
  • the frequency of the fundamental vibration results from the speed of the internal combustion engine in rpm "1 by 60 by 2 in 4-stroke engines or by 1 in 2-stroke engines.” The engine speed is 1000 rpm.
  • a fundamental frequency of 1000 / (60 ⁇ 1) 16.66 Hz.
  • Due to the circumstances (firing order, motor geometry, working method (2/4-stroke), etc.) prove in this example of a 4-stroke internal combustion engine, the vibrations the 6th order (ie 50 Hz) as particularly disturbing for the control behavior.
  • the length L of the branch line is selected in practice in the range of 90% to 1 10% of lambda / 4. In practice, it can be measured which frequency or which order of the fundamental is the disturbing one and the length of the at least one branch line is tuned to it.
  • Transient behavior is the response of the internal combustion engine to changed load specifications. Since it is possible to dispense with otherwise conventional orifices (throttles) in the prechamber gas line for damping the prechamber gas line, the prechamber gas line is subject to a smaller throttling and the transient behavior of the internal combustion engine is improved thanks to the invention.
  • Protection is also desired for an internal combustion engine, preferably a stationary internal combustion engine with such a pre-chamber gas control system.
  • FIG. 1 shows schematically a pre-chamber gas control line 1 with an internal combustion engine 2.
  • the internal combustion engine 2 merely shows a combustion chamber 3 formed by a piston and a cylinder.
  • internal combustion engines 2 often have a plurality of cylinders and thus combustion chambers 3.
  • Into the combustion chamber 3 protrudes an antechamber 4, which is supplied via a pre-chamber gas 6 with propellant gas.
  • a suction line 5 also opens into the combustion chamber 3. Via inlet valves 9, the mixture present in the suction line 5 passes into the combustion chamber 3.
  • the prechamber gas line 6 is supplied with propellant gas by a prechamber gas source 11.
  • the gas control member 7 regulates the flow rate of propellant gas from the Prechamber gas source 1 1, which flows via the prechamber gas 6 to the prechamber 4.
  • the gas control element 7 is connected via a control line 8 to the intake line 5 of the internal combustion engine 2.
  • the gas control member 7 may for example be designed as a differential pressure regulator.
  • the gas control element 7 is a differential pressure regulator with a membrane 13 acted upon by the pressure in the control line 8.
  • the membrane 13 is connected to a controllable valve, as is known per se from the prior art.
  • the gas control element 7 can take into account the charging pressure of the internal combustion engine 2 present in the intake line 5 during the metering of propellant gas for the pre-chamber 4.
  • the lambda wavelength is calculated at an assumed gas temperature of 20 ° C and an air velocity of about 340 m / s at 680 cm.
  • the lambda quarter and thus the length L of the branch line is calculated in this case at about 170 cm.
  • the length L of the branch line is in practice in the range of 0.9 ... 1 .1 x lambda / 4 selected.
  • the pressure oscillations in the suction line 5 are transmitted to the control line 8 and thus affect the signal quality for actuating the gas control element 7. It is obvious that the control behavior of the gas control element 7 is affected by the superposition of the pressure in the control line 8 by pressure oscillations.
  • the length L of the branch line 10 is dimensioned such that this ⁇ / 4 has the wavelength ⁇ of the pressure oscillation.
  • branch lines 10 of different lengths L may be provided in order to eliminate different frequencies in the control line 8 in this way.
  • the gas control element 7 designed as a differential pressure regulator with a membrane 13
  • the control line 8 facing away from the membrane space is usually connected via a connecting line 12 with the pre-chamber gas 6 so that in the membrane space on this side, the pressure of the pre-chamber gas line 6 is applied.
  • the gas control member 7 may of course also be designed differently than shown, for example as an electronic differential pressure regulator, which detects the differential pressure between the pre-chamber gas line 6 and control line 8 via pressure sensors.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Analytical Chemistry (AREA)
  • Characterised By The Charging Evacuation (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Abstract

The invention relates to a pre-chamber gas control system (1) for a combustion engine (2), comprising at least one combustion chamber (3) and at least one pre-chamber (4) connected to the at least one combustion chamber (3), wherein the at least one combustion chamber (3) can be supplied with propellant gas via an intake line (5), and the at least one pre-chamber (4) can be supplied with propellant gas via a pre-chamber gas line (6), wherein the pre-chamber gas control system (1) comprises: at least one closed-loop gas control member (7) for apportioning the amount of propellant gas that can be supplied to the pre-chamber (4) via the pre-chamber gas line (6); at least one open-loop control line (8) which joins the closed-loop gas control member (7) to an intake line (5) of the combustion engine (2), wherein at least one branch line (10) is connected to the open-loop control line (8), wherein the length (L) of the at least one branch line (10) is a quarter of the wavelength of the fundamental oscillation or a predetermined harmonic oscillation of a pressure oscillation in the intake line (5) at a predetermined rotational speed of the combustion engine (2).

Description

Vorkammergasregelstrecke für eine Brennkraftmaschine  Pre-chamber gas control system for an internal combustion engine
Die Erfindung betrifft eine Vorkammergasregelstrecke für eine Brennkraftmaschine mit den Merkmalen des Oberbegriffs von Anspruch 1 sowie eine Brennkraftmaschine mit den Merkmalen des Oberbegriffs von Anspruch 5. The invention relates to a pre-chamber gas control system for an internal combustion engine with the features of the preamble of claim 1 and an internal combustion engine having the features of the preamble of claim 5.
Eine Vorkammergasregelstrecke ist beispielsweise aus der WO 2014/147978 A1 bekannt. Aufgabe einer Vorkammergasregelstrecke ist es, den mit den Brennräumen einer Brennkraftmaschine verbundenen Vorkammern die für die sichere Entflammung des Hauptbrennraums notwendige Menge an Treibgas zuzumessen. In der Regel erfolgt der eigentliche Eintritt von Treibgas in die Vorkammer über ein passives, vom Differenzdruck zwischen Vorkammer und Vorkammergasversorgung ausgelöstes Vorkammergasventil. An antechamber gas control system is known, for example, from WO 2014/147978 A1. The task of a pre-chamber gas control line is to meter the necessary for the safe ignition of the main combustion chamber amount of propellant to the chambers connected to the combustion chambers of an internal combustion engine. As a rule, the actual entry of propellant gas into the prechamber takes place via a passive prechamber gas valve triggered by the differential pressure between prechamber and prechamber gas supply.
In einer aus dem Stand der Technik bekannten Ausgestaltung einer Vorkammergasregelstrecke weist diese ein Gasregelorgan auf, welches strömungstechnisch über eine Steuerleitung mit einem Ansaugkanal der Brennkraftmaschine verbunden ist. Mittels dieser Steuerleitung und dem damit verbundenen Gasregelorgan kann in der Zumessung von Treibgas in die Vorkammergasleitung der in der Ansaugleitung herrschende Ladedruck der Brennkraftmaschine berücksichtigt werden. In a known from the prior art embodiment of a pre-chamber gas control this has a gas control element, which is fluidically connected via a control line with an intake passage of the internal combustion engine. By means of this control line and the associated gas control element can be taken into account in the metering of propellant gas in the pre-chamber gas line prevailing in the intake manifold boost pressure of the internal combustion engine.
Aufgabe der vorliegenden Erfindung ist es, eine gegenüber dem Stand der Technik verbesserte Vorkammergasregelstrecke bzw. Brennkraftmaschine anzugeben. Object of the present invention is to provide a comparison with the prior art improved pre-chamber gas control system or internal combustion engine.
Die Aufgabe wird gelöst durch eine Vorkammergasregelstrecke mit den Merkmalen von Anspruch 1 bzw. eine Brennkraftmaschine mit den Merkmalen von Anspruch 5. Indem mit der Steuerleitung wenigstens eine Zweigleitung verbunden ist, wobei die Länge der wenigstens einen Zweigleitung ein Viertel der Wellenlänge der Grundschwingung oder einer vorgegebenen Oberschwingung einer Druckschwingung in der Ansaugleitung bei einer vorgegebenen Drehzahl der Brennkraftmaschine beträgt, können aus der Ansaugleitung herrührende Druckschwingungen in der Steuerleitung wirkungsvoll gedämpft werden und so das Regelverhalten der Vorkammergasregelstrecke verbessert werden. The object is achieved by a Vorkammergasregelstrecke with the features of claim 1 and an internal combustion engine with the features of claim 5. By at least one branch line is connected to the control line, wherein the length of the at least one branch line a quarter of the wavelength of the fundamental or a predetermined Harmonic of a pressure oscillation in the intake pipe at a predetermined speed of the internal combustion engine, may originate from the intake pressure pressure oscillations in the control line be effectively damped and so the control behavior of Vorkammergasregelstrecke be improved.
In Versuchen der Anmelderin hat sich nämlich gezeigt, dass sich Druckschwingungen, welche, verursacht durch die zyklische Betätigung der Einlassventile, in der Ansaugleitung der Brennkraftmaschine vorliegen, auch auf die Steuerleitung übertragen und das Regelverhalten des Gasregelorgans beeinträchtigen. Indem also erfindungsgemäß die von der Ansaugleitung auf die Steuerleitung übertragenen Druckschwingungen in der Steuerleitung über einen Lambda-Viertel-Resonator gedämpft werden, wird das Regelverhalten des Gasregelorgans verbessert. Die Bemessung der Länge der wenigstens einen Zweigleitung sei an einem Beispiel erklärt: In tests of the Applicant has been shown that pressure oscillations, which, caused by the cyclical actuation of the intake valves, present in the intake manifold of the internal combustion engine, also transferred to the control line and affect the control behavior of the gas control element. Thus, according to the invention, by virtue of the invention, the pressure oscillations in the control line transmitted from the intake line to the control line are damped via a quarter-wave resonator, the regulating behavior of the gas control element is improved. The dimensioning of the length of the at least one branch line is explained by an example:
Unter Berücksichtigung der Gaseigenschaften in der Steuerleitung (vor allem Temperatur und Dichte) kann aus dem bekannten Zusammenhang Taking into account the gas properties in the control line (especially temperature and density) can from the known context
Lambda = c/v mit c der Schallgeschwindigkeit im Gas und v der Frequenz der Grundschwingung, die Wellenlänge Lambda der Grundschwingung errechnet werden. Lambda = c / v with c the speed of sound in the gas and v the frequency of the fundamental, the wavelength lambda of the fundamental are calculated.
Die Schallgeschwindigkeit c kann aus Tabellenwerken entnommen werden oder über die Formel c = Wurzel(kappa*R*T) mit kappa = Isentropenexponent, R = Gaskonstante, T=Temperatur berechnet werden. Die Frequenz der Grundschwingung ergibt sich aus der Drehzahl der Brennkraftmaschine in Umin"1 durch 60 durch 2 bei 4-Takt-Motoren bzw. durch 1 bei 2- Takt-Motoren. Die Drehzahl der Brennkraftmaschine betrage 1000 U/min. The speed of sound c can be taken from tables or calculated using the formula c = root (kappa * R * T) with kappa = isentropic exponent, R = gas constant, T = temperature. The frequency of the fundamental vibration results from the speed of the internal combustion engine in rpm "1 by 60 by 2 in 4-stroke engines or by 1 in 2-stroke engines." The engine speed is 1000 rpm.
Dann gelangt man im vorliegenden Beispiel eines 4-Takt-Motors auf eine Frequenz der Grundschwingung von 1000/(60 · 2) = 8,33 Hz. Bei einem 2-Takt- Arbeitsverfahren würde sich eine Frequenz der Grundschwingung von 1000/(60 · 1 ) = 16,66 Hz ergeben. Die tatsächlich zu dämpfende Schwingung ergibt sich aus n mal der Frequenz der Grundschwingung, mit n = Ordnung der zu dämpfenden Schwingung. Durch die Gegebenheiten (Zündreihenfolge, Motorgeometrie, Arbeitsverfahren (2/4-Takt) etc.) erweisen sich in diesem Beispiel einer 4-Takt- Brennkraftmaschine die Schwingungen der 6. Ordnung (d.h. 50 Hz) als besonders störend für das Regelverhalten. Die Länge L der Zweigleitung wird in der Praxis im Bereich von 90% bis 1 10% von Lambda/4 gewählt. In der Praxis kann gemessen werden, welche Frequenz bzw. welche Ordnung der Grundschwingung die störende ist und es wird die Länge der wenigstens einen Zweigleitung darauf abgestimmt. Then, in the present example of a 4-cycle motor, the frequency of the fundamental is 1000 / (60 × 2) = 8.33 Hz. In a 2-cycle method, a fundamental frequency of 1000 / (60 × 1) = 16.66 Hz. The oscillation actually to be damped results from n times the frequency of the fundamental oscillation, with n = order of the oscillation to be damped. Due to the circumstances (firing order, motor geometry, working method (2/4-stroke), etc.) prove in this example of a 4-stroke internal combustion engine, the vibrations the 6th order (ie 50 Hz) as particularly disturbing for the control behavior. The length L of the branch line is selected in practice in the range of 90% to 1 10% of lambda / 4. In practice, it can be measured which frequency or which order of the fundamental is the disturbing one and the length of the at least one branch line is tuned to it.
Es ist natürlich auch vorstellbar, durch Vorsehen mehrerer Zweigleitungen unterschiedlicher Länge verschiedene Frequenzen zu unterdrücken.  Of course, it is also conceivable to suppress different frequencies by providing a plurality of branch lines of different lengths.
Ein weiterer Vorteil der Erfindung liegt in einem verbesserten Transientenverhalten der Brennkraftmaschine. Als transientes Verhalten wird das Ansprechen der Brennkraftmaschine auf geänderte Lastvorgaben verstanden. Da durch die Erfindung auf sonst übliche Blenden (Drosseln) in der Vorkammergasleitung zur Bedämpfung der Vorkammergasleitung verzichtet werden kann, unterliegt die Vorkammergasleitung dank der Erfindung einer geringeren Drosselung und das angesprochene transiente Verhalten der Brennkraftmaschine ist verbessert. Another advantage of the invention lies in an improved transient behavior of the internal combustion engine. Transient behavior is the response of the internal combustion engine to changed load specifications. Since it is possible to dispense with otherwise conventional orifices (throttles) in the prechamber gas line for damping the prechamber gas line, the prechamber gas line is subject to a smaller throttling and the transient behavior of the internal combustion engine is improved thanks to the invention.
Schutz wird auch begehrt für eine Brennkraftmaschine, bevorzugt eine stationäre Brennkraftmaschine mit einer solchen Vorkammergasregelstrecke. Protection is also desired for an internal combustion engine, preferably a stationary internal combustion engine with such a pre-chamber gas control system.
Die Erfindung wird durch beiliegende Figur näher erläutert. The invention is explained in more detail by enclosed figure.
Fig. 1 zeigt schematisch eine Vorkammergasregelstrecke 1 mit einer Brennkraftmaschine 2. Von der Brennkraftmaschine 2 ist lediglich ein von einem Kolben und einem Zylinder gebildeter Brennraum 3 dargestellt. In der Praxis weisen Brennkraftmaschinen 2 häufig eine Vielzahl von Zylindern und damit Brennräumen 3 auf. In den Brennraum 3 ragt eine Vorkammer 4, welche über eine Vorkammergasleitung 6 mit Treibgas versorgbar ist. Ebenfalls in den Brennraum 3 mündet eine Ansaugleitung 5. Über Einlassventile 9 gelangt das in der Ansaugleitung 5 anliegende Gemisch in den Brennraum 3. 1 shows schematically a pre-chamber gas control line 1 with an internal combustion engine 2. The internal combustion engine 2 merely shows a combustion chamber 3 formed by a piston and a cylinder. In practice, internal combustion engines 2 often have a plurality of cylinders and thus combustion chambers 3. Into the combustion chamber 3 protrudes an antechamber 4, which is supplied via a pre-chamber gas 6 with propellant gas. A suction line 5 also opens into the combustion chamber 3. Via inlet valves 9, the mixture present in the suction line 5 passes into the combustion chamber 3.
Die Vorkammergasleitung 6 wird durch eine Vorkammergasquelle 1 1 mit Treibgas versorgt. Das Gasregelorgan 7 regelt die Durchflussmenge von Treibgas von der Vorkammergasquelle 1 1 , welches über die Vorkammergasleitung 6 zur Vorkammer 4 strömt. Das Gasregelorgan 7 ist über eine Steuerleitung 8 mit der Ansaugleitung 5 der Brennkraftmaschine 2 verbunden. Das Gasregelorgan 7 kann beispielsweise als Differenzdruckregler ausgeführt sein. Im gezeigten Ausführungsbeispiel handelt es sich bei dem Gasregelorgan 7 um einen Differenzdruckregler mit einer vom Druck in der Steuerleitung 8 beaufschlagten Membran 13. Die Membran 13 ist in diesem Fall mit einem regelbaren Ventil verbunden, wie es an sich aus dem Stand der Technik bekannt ist. Über die Steuerleitung 8 kann das Gasregelorgan 7 den in der Ansaugleitung 5 anliegenden Ladedruck der Brennkraftmaschine 2 bei der Zumessung an Treibgas für die Vorkammer 4 berücksichtigen. Gezeigt ist weiters eine Zweigleitung 10 mit der Länge L. The prechamber gas line 6 is supplied with propellant gas by a prechamber gas source 11. The gas control member 7 regulates the flow rate of propellant gas from the Prechamber gas source 1 1, which flows via the prechamber gas 6 to the prechamber 4. The gas control element 7 is connected via a control line 8 to the intake line 5 of the internal combustion engine 2. The gas control member 7 may for example be designed as a differential pressure regulator. In the exemplary embodiment shown, the gas control element 7 is a differential pressure regulator with a membrane 13 acted upon by the pressure in the control line 8. In this case, the membrane 13 is connected to a controllable valve, as is known per se from the prior art. Via the control line 8, the gas control element 7 can take into account the charging pressure of the internal combustion engine 2 present in the intake line 5 during the metering of propellant gas for the pre-chamber 4. Shown further is a branch line 10 with the length L.
Beim Betrieb der Brennkraftmaschine 2 ergibt sich durch die Betätigung der Einlassventile 9 eine von der Drehzahl der Brennkraftmaschine 2 abhängige Druckschwingung in der Ansaugleitung 5. Bei einer Drehzahl von beispielsweise 1000 Umin"1 beträgt eine charakteristische Schwingung im Ansaugkanal beispielsweise 50 Hz. Dies entspricht der sechsten Ordnung der Grundschwingung von 8,33 Hz. Bei einer Drehzahl von 1500 Umin"1 läge die Grundschwingung bei 12,5 Hz. During operation of the internal combustion engine 2 is dependent on the speed of the internal combustion engine 2, pressure oscillation a characteristic vibration in the intake duct is obtained by the actuation of the intake valves 9 in the intake pipe 5. At a speed of for example, 1000 rpm "1 is, for example 50 Hz. This corresponds to the sixth Order of fundamental frequency of 8.33 Hz. At a speed of 1500 rpm "1 , the fundamental frequency would be 12.5 Hz.
Im vorliegenden Beispiel berechnet sich die Wellenlänge Lambda bei einer angenommenen Gastemperatur von 20°C und einer Schallgeschwindigkeit der Luft von ca. 340 m/s mit 680 cm. Das Lambda-Viertel und somit die Länge L der Zweigleitung berechnet sich in diesem Fall mit etwa 170 cm. In the present example, the lambda wavelength is calculated at an assumed gas temperature of 20 ° C and an air velocity of about 340 m / s at 680 cm. The lambda quarter and thus the length L of the branch line is calculated in this case at about 170 cm.
Die Länge L der Zweigleitung wird in der Praxis im Bereich von 0.9 ... 1 .1 x Lambda/4 gewählt.  The length L of the branch line is in practice in the range of 0.9 ... 1 .1 x lambda / 4 selected.
Die Druckschwingungen in der Ansaugleitung 5 übertragen sich auf die Steuerleitung 8 und beeinträchtigen damit die Signalqualität zur Betätigung des Gasregelorgans 7. Es ist einsichtig, dass durch die Überlagerung des Druckes in der Steuerleitung 8 durch Druckschwingungen das Regelverhalten des Gasregelorgans 7 beeinträchtigt wird. The pressure oscillations in the suction line 5 are transmitted to the control line 8 and thus affect the signal quality for actuating the gas control element 7. It is obvious that the control behavior of the gas control element 7 is affected by the superposition of the pressure in the control line 8 by pressure oscillations.
Zur Dämpfung bzw. Auslöschung der unerwünschten Druckschwingungen in der Steuerleitung 8 wird die Länge L der Zweigleitung 10 so bemessen, dass diese ein λ/4 der Wellenlänge λ der Druckschwingung aufweist. Zur Berechnung wird auf die Beschreibung weiter oben verwiesen. To attenuate or extinguish the undesired pressure oscillations in the control line 8, the length L of the branch line 10 is dimensioned such that this λ / 4 has the wavelength λ of the pressure oscillation. For the calculation, reference is made to the description above.
Es können natürlich auch mehrere Zweigleitungen 10 unterschiedlicher Länge L vorgesehen sein, um auf diese Weise verschiedene Frequenzen in der Steuerleitung 8 zu eliminieren. Of course, a plurality of branch lines 10 of different lengths L may be provided in order to eliminate different frequencies in the control line 8 in this way.
Ist wie im dargestellten Ausführungsbeispiel das Gasregelorgan 7 als Differenzdruckregler mit einer Membran 13 ausgeführt, so ist der der Steuerleitung 8 abgewandte Membranraum in der Regel über eine Verbindungsleitung 12 mit der Vorkammergasleitung 6 verbunden, damit im Membranraum auf dieser Seite der Druck der Vorkammergasleitung 6 anliegt. Is as in the illustrated embodiment, the gas control element 7 designed as a differential pressure regulator with a membrane 13, the control line 8 facing away from the membrane space is usually connected via a connecting line 12 with the pre-chamber gas 6 so that in the membrane space on this side, the pressure of the pre-chamber gas line 6 is applied.
Das Gasregelorgan 7 kann selbstverständlich auch anders als dargestellt ausgeführt sein, beispielsweise als elektronischer Differenzdruckregler, welcher den Differenzdruck zwischen Vorkammergasleitung 6 und Steuerleitung 8 über Drucksensoren erfasst. The gas control member 7 may of course also be designed differently than shown, for example as an electronic differential pressure regulator, which detects the differential pressure between the pre-chamber gas line 6 and control line 8 via pressure sensors.
Liste der verwendeten Bezugszeichen: List of reference numbers used:
1 Vorkammergasregelstrecke1 pre-chamber gas control system
2 Brennkraftmaschine2 internal combustion engine
3 Brennraum 3 combustion chamber
4 Vorkammer  4 pre-chamber
5 Ansaugleitung  5 suction line
6 Vorkammergasleitung 6 prechamber gas line
7 Gasregelorgan 7 gas control element
8 Steuerleitung  8 control line
9 Einlassventil  9 inlet valve
10 Zweigleitung  10 branch line
1 1 Vorkammergasquelle 1 1 pre-chamber gas source
12 Verbindungsleitung12 connection line
13 Membran 13 membrane
L Länge  L length
λ, Lambda Wellenlänge  λ, lambda wavelength

Claims

Patentansprüche claims
1 . Vorkammergasregelstrecke (1 ) für eine Brennkraftmaschine (2) mit wenigstens einem Brennraum (3) und wenigstens einer, mit dem wenigstens einen Brennraum (3) verbundenen Vorkammer (4), wobei der wenigstens eine Brennraum (3) über eine Ansaugleitung (5) mit Treibgas versorgbar ist und die wenigstens eine Vorkammer (4) über eine Vorkammergasleitung (6) mit Treibgas versorgbar ist, wobei die Vorkammergasregelstrecke (1 ) umfasst: 1 . Prechamber gas control system (1) for an internal combustion engine (2) having at least one combustion chamber (3) and at least one antechamber (4) connected to the at least one combustion chamber (3), the at least one combustion chamber (3) being connected via an intake line (5) Propellant is supplied and the at least one pre-chamber (4) via a pre-chamber gas line (6) can be supplied with propellant, wherein the pre-chamber gas control path (1) comprises:
- wenigstens ein Gasregelorgan (7) zur Zumessung der der Vorkammer (4) über die Vorkammergasleitung (6) zuführbaren Menge an Treibgas, - At least one gas control member (7) for metering the pre-chamber (4) via the pre-chamber gas line (6) deliverable amount of propellant,
- wenigstens eine Steuerleitung (8), welche das Gasregelorgan (7) mit einer Ansaugleitung (5) der Brennkraftmaschine (2) verbindet, - At least one control line (8) which connects the gas control member (7) with an intake passage (5) of the internal combustion engine (2),
dadurch gekennzeichnet, dass mit der Steuerleitung (8) wenigstens eine Zweigleitung (10) verbunden ist, wobei die Länge (L) der wenigstens einen Zweigleitung (10) ein Viertel der Wellenlänge der Grundschwingung oder einer vorgegebenen Oberschwingung einer Druckschwingung in der Ansaugleitung (5) bei einer vorgegebenen Drehzahl der Brennkraftmaschine (2) beträgt.  characterized in that at least one branch line (10) is connected to the control line (8), the length (L) of the at least one branch line (10) being a quarter of the wavelength of the fundamental or a predetermined harmonic of a pressure oscillation in the suction line (5). at a predetermined speed of the internal combustion engine (2).
2. Vorkammergasregelstrecke (1 ) nach Anspruch 1 , wobei eine Vielzahl von Zweigleitungen (10) bevorzugt unterschiedlicher Länge (L) vorgesehen ist. 2. Pre-chamber gas control system (1) according to claim 1, wherein a plurality of branch lines (10) preferably of different length (L) is provided.
3. Vorkammergasregelstrecke (1 ) nach Anspruch 1 oder 2, wobei bei einer Drehzahl der Brennkraftmaschine (2) von rund 1000 Umin"1 die Frequenz der Grundschwingung der Druckschwingung in der Ansaugleitung (5) zwischen 7 Hz und 9 Hz liegt, bevorzugt 8,3 Hz beträgt und die Ordnung einer zu dämpfenden Schwingung die sechste Ordnung der Grundschwingung ist. 3. pre-chamber gas control system (1) according to claim 1 or 2, wherein at a speed of the internal combustion engine (2) of about 1000 Umin "1, the frequency of the fundamental of the pressure oscillation in the intake pipe (5) is between 7 Hz and 9 Hz, preferably 8, 3 Hz and the order of a vibration to be damped is the sixth order of the fundamental.
4. Vorkammergasregelstrecke (1 ) nach wenigstens einem der vorangegangenen Ansprüche, wobei bei einer Drehzahl der Brennkraftmaschine (2) von rund 1000 Umin"1 die die Länge (L) der Zweigleitung (10) zwischen 150 cm und 190 cm liegt, bevorzugt 170 cm beträgt. 4. Pre-chamber gas control system (1) according to at least one of the preceding claims, wherein at a speed of the internal combustion engine (2) of about 1000 Umin "1 which is the length (L) of the branch line (10) between 150 cm and 190 cm, preferably 170 cm is.
5. Brennkraftmaschine (2), bevorzugt stationäre Brennkraftmaschine, mit einer Vorkammergasregelstrecke (1 ) nach wenigstens einem der Ansprüche 1 bis 4. 5. Internal combustion engine (2), preferably stationary internal combustion engine, with a prechamber gas control system (1) according to at least one of claims 1 to 4.
PCT/AT2016/050200 2015-06-16 2016-06-14 Pre-chamber gas control system for a combustion engine WO2016201473A1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2599872A (en) * 1945-12-07 1952-06-10 Continental Supply Company Valve
DE2356177A1 (en) * 1972-11-10 1974-05-22 Landi Den Hartog Bv CONTROL DEVICE
US4046120A (en) * 1974-09-27 1977-09-06 Laprade Bernard Regulating system with electromagnetic valve and control valve
JPS5937252A (en) * 1982-08-24 1984-02-29 Yanmar Diesel Engine Co Ltd Gas fuel feeding apparatus for gas engine
US20090076709A1 (en) * 2007-08-30 2009-03-19 Mitsubishi Heavy Industries, Ltd. Method and device for integrative control of gas engine
WO2011015329A1 (en) * 2009-08-03 2011-02-10 Er-System Method for operating a gas engine and gas engine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2599872A (en) * 1945-12-07 1952-06-10 Continental Supply Company Valve
DE2356177A1 (en) * 1972-11-10 1974-05-22 Landi Den Hartog Bv CONTROL DEVICE
US4046120A (en) * 1974-09-27 1977-09-06 Laprade Bernard Regulating system with electromagnetic valve and control valve
JPS5937252A (en) * 1982-08-24 1984-02-29 Yanmar Diesel Engine Co Ltd Gas fuel feeding apparatus for gas engine
US20090076709A1 (en) * 2007-08-30 2009-03-19 Mitsubishi Heavy Industries, Ltd. Method and device for integrative control of gas engine
WO2011015329A1 (en) * 2009-08-03 2011-02-10 Er-System Method for operating a gas engine and gas engine

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