EP0302045A2 - Two-stroke engine - Google Patents

Two-stroke engine Download PDF

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Publication number
EP0302045A2
EP0302045A2 EP88890184A EP88890184A EP0302045A2 EP 0302045 A2 EP0302045 A2 EP 0302045A2 EP 88890184 A EP88890184 A EP 88890184A EP 88890184 A EP88890184 A EP 88890184A EP 0302045 A2 EP0302045 A2 EP 0302045A2
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EP
European Patent Office
Prior art keywords
injection
piston
overflow
internal combustion
combustion engine
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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.)
Granted
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EP88890184A
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German (de)
French (fr)
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EP0302045B2 (en
EP0302045B1 (en
EP0302045A3 (en
Inventor
Diethard Dipl.-Ing. Plohberger
Leopold Dr. Mikulic
Klaus Dr. Landfahrer
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AVL List GmbH
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AVL List GmbH
AVL Gesellschaft fuer Verbrennungskraftmaschinen und Messtechnik mbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F02M69/045—Positioning of injectors with respect to engine, e.g. in the air intake conduit for injecting into the combustion chamber
    • 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
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two

Definitions

  • the invention relates to a two-stroke internal combustion engine with crankcase flushing with an overflow channel, the overflow opening in the cylinder is controlled by the engine piston, the bottom of which is flat and rotationally symmetrical, and with a fuel injection nozzle opposite the outlet opening.
  • the aim of the invention is to avoid these disadvantages and to propose a two-stroke internal combustion engine of the type mentioned at the outset, which is distinguished by a simple structure and only very low fuel losses and hydrocarbon emissions.
  • this is achieved in that the injection jet of the injection nozzle is directed toward the side facing the cylinder space and at least predominantly towards the half of the piston head opposite the outlet opening, the jet axis of the injection jet including an angle with the piston axis which is less than 90 °.
  • the fuel injection takes place during the purging phase nem when the overflow channel and outlet channel are open. The fuel evaporates quickly on the side of the piston head facing the cylinder chamber.
  • the air movement that occurs during the purging of the cylinder leads on the one hand to a very good mixture formation and on the other hand to surprisingly low fuel losses, because due to the at least predominant injection onto the half of the piston head opposite the outlet opening there is an air flow that is directed towards the fuel jet and prevents the outflow of mixture forms a kind of barrier through the simultaneously opened outlet.
  • the measures according to the invention result in the advantage of good cooling of the piston crown by the injected fuel, which also removes the heat of vaporization necessary for the evaporation. This makes it possible to increase the performance of the internal combustion engine with the same dimensions without resulting in an increased fuel loss.
  • the start of injection is fixed before the overflow opening of the overflow channel is opened by the piston, so that part of the fuel can pre-evaporate in the overflow channel. This results in a particularly good mixture formation.
  • the injection nozzle is designed as a multi-hole nozzle, preferably as a two-jet nozzle.
  • each jet axis of the injection jets viewed in a top view of the piston, is directed essentially towards one of the overflow channels additionally arranged on the circumference of the cylinder wall.
  • FIG. 1 shows a two-stroke internal combustion engine according to the invention in longitudinal section, in which a plurality of channels 2, 2 'distributed on the circumference of the cylinder wall 9 open into overflow openings 12, 12' in the cylinder chamber 1, to which an outlet channel 3 with an outlet opening 13 is assigned, which extends over a larger part of the height of the cylinder chamber 1 than the overflow openings 12, 12 'and is therefore released earlier by the piston 4 when the piston 4 moves in the direction of the crankcase, not shown, in order to allow the combustion gases to flow out before the opening of the To enable overflow openings.
  • an injection nozzle 5 is attached arranges whose injection jet 7 is directed against the side 8 of the piston head 6 facing the cylinder chamber 1.
  • the beam axis 7 ' encloses an angle ⁇ with the piston movement directed parallel to the bottom dead center and which is smaller than 90 °.
  • the fuel is largely injected at a point in time at which the piston 4 is in the region of its bottom dead center and the overflow openings 12, 12 'are therefore open. If the duration of the injection exceeds the opening duration of the overflow channels, as can be the case at very high speeds, it is possible and provided with the arrangement described to shift the start of injection in the "earlier" direction so that part of the fuel in the overflow channel 2 or 2 'can pre-evaporate, which also results in a very good mixture formation. As a result, the two-stroke internal combustion engine described is also suitable for very high speeds of up to over 10,000 revolutions per minute, without loss of performance or increased fuel consumption due to insufficient mixture formation or increased fuel losses.
  • FIG. 2 shows a variant of a two-stroke internal combustion engine according to the invention with a plurality of injection nozzles 5 arranged in overflow channels 2, 2 '.
  • the jet axes 7' of the injection jets 7 of this injection nozzle cross each other in a manner clearly offset from the center 11 of the piston 4 in the direction of the overflow channel 2 Point.
  • the injection direction of the nozzle arranged in the overflow channel 2 ' is essentially opposite to the inflow direction of the scavenging air of the opposite overflow channels 2'. This leads to a correspondingly strong swirling of the purge air with the vaporized fuel, which results in a good mixture Direction and control of the charge stratification results. In addition, this also reduces the loss of fuel via the outlet duct 3 and thus also reduces the hydrocarbon emission.
  • FIG. 3 shows a further variant of a two-stroke internal combustion engine according to the invention, in which a two-jet nozzle 5 'is arranged in the overflow channel 2 or in the direction of the area of the cylinder chamber 1 directly adjoining it.
  • the jet axes 7 'of the injection jets 7 of this nozzle are essentially directed against the scavenging air streams entering the cylinder space 1 from two different overflow channels 2'. This ensures particularly good swirling and thus mixture preparation. At the same time, the fuel losses caused by an outflow of the fuel mixture into the outlet channel 3 are minimized.

Abstract

In a two-stroke internal combustion engine with crankcase scavenging with an overflow pipe (2) whose overflow aperture (12) into the cylinder (1) is controlled by the engine piston (4), in order to improve the mixture formation and to reduce the fuel consumption and emission of hydrocarbons, it is proposed that the injection jet (7) of the injection nozzle (5) be directed onto the side (8) facing the cylinder chamber (1) and at least predominantly onto that half of the piston head (4) opposite the outlet aperture (13), the axis (7') of the injection jet (7) enclosing an angle ( alpha ) with the piston axis (10) which is smaller than 90 DEG . <IMAGE>

Description

Die Erfindung bezieht sich auf eine Zweitakt-Brennkraftma­schine mit Kurbelgehäusepülung mit einem Überströmkanal, des­sen Überströmöffnung in den Zylinder vom Motorkolben gesteuert wird, dessen Boden flach und rotationssymmetrisch ausgebildet ist, sowie mit einer der Auslaßöffnung gegenüberliegenden Kraftstoff-Einspritzdüse.The invention relates to a two-stroke internal combustion engine with crankcase flushing with an overflow channel, the overflow opening in the cylinder is controlled by the engine piston, the bottom of which is flat and rotationally symmetrical, and with a fuel injection nozzle opposite the outlet opening.

Eine solche Zweitakt-Brennkraftmaschine wurde z.B. durch die EP-A1 223 767 bekannt. Bei dieser bekannten Lösung ist der Einspritzstrahl von der Kurbelgehäuseseite her in das Innere des hohlen Kolbens gerichtet. Dabei trifft bei der Kolbenbewe­gung zum Kurbelgehäuse hin ein Teil des Kraftstoffes auf die zum Kurbelgehäuse gerichtete Seite des Kolbenbodens auf. Damit läßt sich zwar eine relativ gute Gemischaufbereitung errei­chen, doch muß in Kauf genommen werden, daß ein beträchtlicher Teil des aufbereiteten Gemisches beim Spülen unverbrannt in den Auslaßkanal gelangt und damit verloren geht.Such a two-stroke internal combustion engine has been e.g. known from EP-A1 223 767. In this known solution, the injection jet is directed from the crankcase side into the interior of the hollow piston. When the piston moves towards the crankcase, some of the fuel hits the side of the piston head facing the crankcase. Although a relatively good mixture preparation can be achieved in this way, it must be accepted that a considerable part of the prepared mixture gets into the outlet channel unburned during flushing and is therefore lost.

Ziel der Erfindung ist es, diese Nachteile zu vermeiden und eine Zweitakt-Brennkraftmaschine der eingangs erwähnten Art vorzuschlagen, die sich durch einen einfachen Aufbau und nur sehr geringe Kraftstoffverluste und Kohlenwasserstoff-Emis­sionen auszeichnet.The aim of the invention is to avoid these disadvantages and to propose a two-stroke internal combustion engine of the type mentioned at the outset, which is distinguished by a simple structure and only very low fuel losses and hydrocarbon emissions.

Erfindungsgemäß wird dies dadurch erreicht, daß der Einspritz­strahl der Einspritzdüse auf die dem Zylinderraum zugewandte Seite und zumindest überwiegend auf die der Auslaßöffnung ge­genüberliegende Hälfte des Kolbenbodens gerichtet ist, wobei die Strahlachse des Einspritzstrahles mit der Kolbenachse einen Winkel einschließt, der kleiner als 90° ist. Dabei er­folgt die Kraftstoffeinspritzung während der Spülphase zu ei­ nem Zeitpunkt, zu dem Überströmkanal und Auslaßkanal offen sind. Der Kraftstoff verdampft rasch an der dem Zylinderraum zugewandten Seite des Kolbenbodens. Durch die während der Spü­lung des Zylinders vorhandene Luftbewegung kommt es einerseits zu einer sehr guten Gemischbildung und andererseits zu überra­schend geringen Kraftstoffverlusten, weil durch das zumindest überwiegende Einspritzen auf die der Auslaßöffnung gegen­überliegende Hälfte des Kolbenbodens eine dem Kraftstoffstrahl entgegengerichtete Luftströmung vorhanden ist, welche gegen das Abströmen von Gemisch durch den gleichzeitig geöffneten Auslaß eine Art Barriere bildet.According to the invention, this is achieved in that the injection jet of the injection nozzle is directed toward the side facing the cylinder space and at least predominantly towards the half of the piston head opposite the outlet opening, the jet axis of the injection jet including an angle with the piston axis which is less than 90 °. The fuel injection takes place during the purging phase nem when the overflow channel and outlet channel are open. The fuel evaporates quickly on the side of the piston head facing the cylinder chamber. The air movement that occurs during the purging of the cylinder leads on the one hand to a very good mixture formation and on the other hand to surprisingly low fuel losses, because due to the at least predominant injection onto the half of the piston head opposite the outlet opening there is an air flow that is directed towards the fuel jet and prevents the outflow of mixture forms a kind of barrier through the simultaneously opened outlet.

Weiters ergibt sich durch die erfindungsgemäßen Maßnahmen der Vorteil einer guten Kühlung des Kolbenbodens durch den einge­spritzten Kraftstoff, der diesem auch die für die Verdampfung notwendige Verdampfungswärme entzieht. Dadurch ist eine Lei­stungssteigerung der Brennkraftsmaschine bei gleichbleibenden Abmessungen möglich, ohne daß sich dadurch ein erhöhter Kraft­stoffverlust ergibt.Furthermore, the measures according to the invention result in the advantage of good cooling of the piston crown by the injected fuel, which also removes the heat of vaporization necessary for the evaporation. This makes it possible to increase the performance of the internal combustion engine with the same dimensions without resulting in an increased fuel loss.

Außerdem ergibt sich dadurch eine verbesserte Möglichkeit der Steuerung der Ladungsschichtung im Zylinderraum.This also results in an improved possibility of controlling the charge stratification in the cylinder space.

In einer weiteren Ausgestaltung der Erfindung kann vorgesehen sein, daß für den Bereich höherer Motordrehzahlen und Lasten der Einspritzbeginn schon vor Öffnen der Überströmöffnung des Überströmkanals durch den Kolben festgelegt ist, sodaß ein Teil des Kraftstoffes im Überströmkanal vorverdampfen kann. Dies ergibt eine besonders gute Gemischbildung.In a further embodiment of the invention, it can be provided that for the area of higher engine speeds and loads, the start of injection is fixed before the overflow opening of the overflow channel is opened by the piston, so that part of the fuel can pre-evaporate in the overflow channel. This results in a particularly good mixture formation.

Es ist auch möglich, erst zu einem gegenüber dem Beginn des Spülvorganges verzögerten Zeitpunkt einzuspritzen, wodurch die Kraftstoffverluste weiter minimiert werden können. Diese sind im allgemeinen niedriger als bei der eingangs genannten aus der EP-A1 223 767 bekannten Brennkraftmaschine.It is also possible to inject only at a point in time delayed from the start of the flushing process, as a result of which fuel losses can be further minimized. These are generally lower than in the internal combustion engine known from EP-A1 223 767.

Eine bessere Verteilung des Kraftstoffes auf der Oberfläche des Kolbenbodens wird erfindungsgemäß erreicht, wenn die Ein­spritzdüse als Mehrlochdüse, vorzugsweise als Zweistrahldüse, ausgebildet ist.A better distribution of the fuel on the surface of the piston crown is achieved according to the invention if the injection nozzle is designed as a multi-hole nozzle, preferably as a two-jet nozzle.

Im Rahmen der Erfindung ist es vorteilhaft, wenn in zusätzlich am Umfang der Zylinderwand angeordneten Überströmkanälen wei­tere Einspritzdüsen vorgesehen sind. Deren Achsen können, in Draufsicht auf den Kolben gesehen, im wesentlichen entspre­chend der Richtung der an den Zylinderraum unmittelbar an­schließenden Teile der Überströmkanäle verlaufen.In the context of the invention, it is advantageous if additional injection nozzles are provided in overflow channels additionally arranged on the circumference of the cylinder wall. When viewed from the top of the piston, their axes can run essentially in accordance with the direction of the parts of the overflow channels immediately adjoining the cylinder chamber.

Eine Weiterbildung der Erfindung sieht vor, daß jede Strahlachse der Einspritzstrahlen, in Draufsicht auf den Kol­ben gesehen, im wesentlichen auf einen der zusätzlich am Um­fang der Zylinderwand angeordneten Überströmkanäle gerichtet ist. Durch diese Maßnahmen ist sichergestellt, daß die Ein­spritzstrahlen Komponenten des Spülluftstromes entgegengerich­tet sind, wodurch einerseits die Verwirbelung des entstehenden Kraftstoffdampfes mit der Spülluft verbessert und anderseits ein Mitreißen des entsprechenden Kraftstoffgemisches in den Auslaßkanal weiter vermindert wird.A further development of the invention provides that each jet axis of the injection jets, viewed in a top view of the piston, is directed essentially towards one of the overflow channels additionally arranged on the circumference of the cylinder wall. These measures ensure that the injection jets components of the scavenging air flow are opposed, which on the one hand improves the swirling of the fuel vapor formed with the scavenging air and on the other hand further reduces the entrainment of the corresponding fuel mixture into the outlet duct.

Die Erfindung wird nun anhand der Zeichnung näher erläutert. Dabei zeigen:

  • Fig. 1 schematisch einen Längsschnitt durch eine erfindungsgemäße Zweitakt-Brennkraftmaschine,
  • Fig. 2 und 3 verschiedene Ausführungsvarianten einer erfindungsgemäßen Zweitakt-Brennkraftmaschine im Querschnitt.
The invention will now be explained in more detail with reference to the drawing. Show:
  • 1 schematically shows a longitudinal section through a two-stroke internal combustion engine according to the invention,
  • 2 and 3 different embodiment variants of a two-stroke internal combustion engine according to the invention in cross section.

Fig. 1 zeigt eine erfindungsgemäße Zweitakt-Brennkraftmaschine im Längsschnitt, bei der in den Zylinderraum 1 mehrere, am Um­fang der Zylinderwand 9 verteilte Kanäle 2, 2' in Überström­öffnungen 12, 12' münden, denen ein Auslaßkanal 3 mit einer Auslaßöffnung 13 zugeordnet ist, der sich über einen größeren Teil der Höhe des Zylinderraumes 1 als die Überströmöffnun­gen 12, 12' erstreckt und daher bei einer Bewegung des Kol­bens 4 in Richtung auf das nicht dargestellte Kurbelgehäuse früher vom Kolbem 4 freigegeben wird, um ein Abströmen der Verbrennungsgase vor dem Öffnen der Überströmöffnungen zu er­möglichen.1 shows a two-stroke internal combustion engine according to the invention in longitudinal section, in which a plurality of channels 2, 2 'distributed on the circumference of the cylinder wall 9 open into overflow openings 12, 12' in the cylinder chamber 1, to which an outlet channel 3 with an outlet opening 13 is assigned, which extends over a larger part of the height of the cylinder chamber 1 than the overflow openings 12, 12 'and is therefore released earlier by the piston 4 when the piston 4 moves in the direction of the crankcase, not shown, in order to allow the combustion gases to flow out before the opening of the To enable overflow openings.

In einem der Überströmkanäle 2 ist eine Einspritzdüse 5 ange­ ordnet, deren Einspritzstrahl 7 gegen die dem Zylinderraum 1 zugewandte Seite 8 des Kolbenbodens 6 gerichtet ist. Die Strahlachse 7' schließt dabei mit der zur Kolbenachse 10 pa­rallelen zum unteren Totpunkt gerichteten Kolbenbewegung einen Winkel α ein, der kleiner als 90° ist.In one of the overflow channels 2, an injection nozzle 5 is attached arranges whose injection jet 7 is directed against the side 8 of the piston head 6 facing the cylinder chamber 1. The beam axis 7 'encloses an angle α with the piston movement directed parallel to the bottom dead center and which is smaller than 90 °.

Wie in Fig. 1 angedeutet ist, erfolgt die Einspritzung des Kraftstoffes zum Großteil zu einem Zeitpunkt, zu dem sich der Kolben 4 im Bereich seines unteren Totpunktes befindet und die Überströmöffnungen 12, 12' daher offen sind. Wenn die Dauer der Einspritzung die Öffnungsdauer der Überströmkanäle über­steigt, wie das bei sehr hohen Drehzahlen der Fall sein kann, ist es mit der beschriebenen Anordnung möglich und vorgesehen, den Einspritzbeginn in Richtung "früher" so zu verschieben, daß ein Teil des Kraftstoffes im Überströmkanal 2 bzw. 2' vor­verdampfen kann, wodurch sich ebenfalls eine sehr gute Ge­mischbildung ergibt. Dadurch eignet sich die beschriebene Zweitakt-Brennkraftmaschine auch für sehr hohe Drehzahlen bis über 10 000 Umdrehungen pro Minute, ohne daß ein Leistungsver­lust oder erhöhter Kraftstoffverbrauch durch mangelnde Ge­mischbildung oder erhöhte Kraftstoffverluste auftreten kann.As indicated in FIG. 1, the fuel is largely injected at a point in time at which the piston 4 is in the region of its bottom dead center and the overflow openings 12, 12 'are therefore open. If the duration of the injection exceeds the opening duration of the overflow channels, as can be the case at very high speeds, it is possible and provided with the arrangement described to shift the start of injection in the "earlier" direction so that part of the fuel in the overflow channel 2 or 2 'can pre-evaporate, which also results in a very good mixture formation. As a result, the two-stroke internal combustion engine described is also suitable for very high speeds of up to over 10,000 revolutions per minute, without loss of performance or increased fuel consumption due to insufficient mixture formation or increased fuel losses.

Durch das Auftreffen von relativ kühlem Kraftstoff auf den Kolbenboden 6 und dessen Verdampfung ergibt sich ein beträcht­licher Kühleffekt für den Kolbenboden 6, sodaß dieser einer­seits dünner ausgeführt werden kann und anderseits eine ent­sprechende Leistungssteigerung aufgrund der verminderten Wär­medehnung des Kolbenoberteils möglich ist.The impact of relatively cool fuel on the piston crown 6 and its evaporation results in a considerable cooling effect for the piston crown 6, so that it can be made thinner on the one hand and a corresponding increase in performance is possible due to the reduced thermal expansion of the piston upper part.

Fig. 2 zeigt eine Variante einer erfindungsgemäßen Zwei­takt-Brennkraftmaschine mit mehreren in Überströmkanälen 2, 2' angeordneten Einspritzdüsen 5. Die Strahlachsen 7' der Ein­spritzstrahlen 7 dieser Einspritzdüse kreuzen einander in einem deutlich vom Mittelpunkt 11 des Kolbens 4 in Richtung zum Überströmkanal 2 hin versetzten Punkt. Dabei ist die Ein­spritzrichtung der im Überströmkanal 2' angeordneten Düse im wesentlichen der Einströmrichtung der Spülluft der gegenüber­liegenden Überströmkanäle 2' entgegengerichtet. Dies führt zu einer entsprechend starken Verwirbelung der Spülluft mit dem verdampften Kraftstoff, wodurch sich eine gute Gemischaufbe­ reitung und Steuerung der Ladungsschichtung ergibt. Außerdem wird dadurch auch ein Verlust von Kraftstoff über den Auslaß­kanal 3 verringert und damit auch eine Verringerung der Koh­lenwasserstoff-Emission erreicht.2 shows a variant of a two-stroke internal combustion engine according to the invention with a plurality of injection nozzles 5 arranged in overflow channels 2, 2 '. The jet axes 7' of the injection jets 7 of this injection nozzle cross each other in a manner clearly offset from the center 11 of the piston 4 in the direction of the overflow channel 2 Point. The injection direction of the nozzle arranged in the overflow channel 2 'is essentially opposite to the inflow direction of the scavenging air of the opposite overflow channels 2'. This leads to a correspondingly strong swirling of the purge air with the vaporized fuel, which results in a good mixture Direction and control of the charge stratification results. In addition, this also reduces the loss of fuel via the outlet duct 3 and thus also reduces the hydrocarbon emission.

Fig. 3 zeigt eine weitere Variante einer erfindungsgemäßen Zweitakt-Brennkraftmaschine, bei der im Überströmkanal 2, bzw. in Richtung des an den Zylinderraum 1 unmittelbar anschließen­den Bereiches eines solchen, eine Zweistrahldüse 5' angeordnet ist. Dabei sind die Strahlachsen 7' der Einspritzstrahlen 7 dieser Düse im wesentlichen den aus zwei verschiedenen Über­strömkanälen 2' in den Zylinderraum 1 eintretenden Spülluft­strömen entgegengerichtet. Dadurch wird eine besonders gute Verwirbelung und damit Gemischaufbereitung sichergestellt. Gleichzeitig werden die durch ein Abströmen von Kraftstoffge­misch in den Auslaßkanal 3 bedingten Kraftstoffverluste mini­miert.FIG. 3 shows a further variant of a two-stroke internal combustion engine according to the invention, in which a two-jet nozzle 5 'is arranged in the overflow channel 2 or in the direction of the area of the cylinder chamber 1 directly adjoining it. The jet axes 7 'of the injection jets 7 of this nozzle are essentially directed against the scavenging air streams entering the cylinder space 1 from two different overflow channels 2'. This ensures particularly good swirling and thus mixture preparation. At the same time, the fuel losses caused by an outflow of the fuel mixture into the outlet channel 3 are minimized.

Claims (5)

1. Zweitakt-Brennkraftmaschine mit Kurbelgehäusepülung mit einem Überströmkanal (2), dessen Überströmöffnung (12) in den Zylinder (1) vom Motorkolben (4) gesteuert wird, des­sen Boden (8) flach und rotationssymmetrisch ausgebildet ist, sowie mit einer der Auslaßöffnung (13) gegenüberlie­genden Kraftstoff-Einspritzdüse (5), dadurch gekennzeich­et, daß der Einspritzstrahl (7) der Einspritzdüse (5) auf die dem Zylinderraum (1) zugewandte Seite (8) und zu­mindest überwiegend auf die der Auslaßöffnung (13) gegen­überliegende Hälfte des Kolbenbodens (4) gerichtet ist, wobei die Strahlachse (7') des Einspritzstrahles (7) mit der Kolbenachse (10) einen Winkel (α) einschließt, der kleiner als 90° ist.1. Two-stroke internal combustion engine with crankcase flushing with an overflow channel (2), the overflow opening (12) in the cylinder (1) is controlled by the engine piston (4), the bottom (8) of which is flat and rotationally symmetrical, and with one of the outlet opening ( 13) opposite fuel injection nozzle (5), characterized in that the injection jet (7) of the injection nozzle (5) on the side (8) facing the cylinder chamber (1) and at least predominantly on the half of the piston head opposite the outlet opening (13) (4) is directed, the jet axis (7 ') of the injection jet (7) forming an angle (α) with the piston axis (10) which is less than 90 °. 2. Zweitakt-Brennkraftmaschine nach Anspruch 1, dadurch ge­kennzeichet, daß für den Bereich höherer Motordrehzahlen und Lasten der Einspritzbeginn schon vor Öffnen der Überströmöffnung (12) des Überströmkanals (2) durch den Kolben (4) festgelegt ist, sodaß ein Teil des Kraftstoffes im Überströmkanal (2) vorverdampfen kann.2. Two-stroke internal combustion engine according to claim 1, characterized in that for the area of higher engine speeds and loads the start of injection is already established before opening the overflow opening (12) of the overflow channel (2) by the piston (4), so that part of the fuel in Overflow channel (2) can pre-evaporate. 3. Zweitakt-Brennkraftmaschine nach Anspruch 1 oder 2, da­durch gekennzeichet, daß die Einspritzdüse als Mehrloch­düse, vorzugsweise als Zweistrahldüse (5') ausgebildet ist.3. Two-stroke internal combustion engine according to claim 1 or 2, characterized in that the injection nozzle is designed as a multi-hole nozzle, preferably as a two-jet nozzle (5 '). 4. Zweitakt-Brennkraftmaschine nach einem der Anspürche 1 bis 3, dadurch gekennzeichet, daß in zusätzlich an Umfang der Zylinderwand (9) angeordneten Überströmkanälen (2') weite­re Einspritzdüsen (5) vorgesehen sind.4. Two-stroke internal combustion engine according to one of claims 1 to 3, characterized in that additional injection nozzles (5) are provided in overflow channels (2 ') additionally arranged on the circumference of the cylinder wall (9). Zweitakt-Brennkraftmaschine nach Anspruch 3 oder 4, da­durch gekennzeichet, daß jede Strahlachse (7') der Ein­spritzstrahlen (7), in Draufsicht auf den Kolben (4) ge­sehen, im wesentlichen auf einen der zusätzlich am Umfang der Zylinderwand (9) angeordneten Übströmkanäle (2') ge­richtet ist.Two-stroke internal combustion engine according to claim 3 or 4, characterized in that each jet axis (7 ') of the injection jets (7), seen in plan view of the piston (4), essentially on one of the overflow channels additionally arranged on the circumference of the cylinder wall (9) (2 ') is directed.
EP19880890184 1987-07-30 1988-07-11 Two-stroke engine Expired - Lifetime EP0302045B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT193787A AT397695B (en) 1987-07-30 1987-07-30 TWO-STROKE INTERNAL COMBUSTION ENGINE
AT1937/87 1987-07-30

Publications (4)

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EP0302045A2 true EP0302045A2 (en) 1989-02-01
EP0302045A3 EP0302045A3 (en) 1990-01-17
EP0302045B1 EP0302045B1 (en) 1992-03-04
EP0302045B2 EP0302045B2 (en) 1994-11-17

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Family Applications (1)

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EP19880890184 Expired - Lifetime EP0302045B2 (en) 1987-07-30 1988-07-11 Two-stroke engine

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EP (1) EP0302045B2 (en)
JP (1) JPH0737765B2 (en)
AT (1) AT397695B (en)
DE (1) DE3868760D1 (en)

Cited By (11)

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FR2692625A1 (en) * 1992-06-18 1993-12-24 Stihl Andreas Two-stroke engine for chain saws.
EP0661431A3 (en) * 1993-12-28 1995-09-20 Yamaha Motor Co Ltd Method for supplying air and injecting fuel into a combustion chamber of an internal combustion engine, in particular a two-cycle engine and internal combustion engine.
WO1998038419A1 (en) * 1997-02-28 1998-09-03 Bimota S.P.A. A direct electronic fuel injection system for two-stroke internal combustion engines
WO2001069544A1 (en) 2000-03-14 2001-09-20 British Telecommunications Public Limited Company Secure services
FR2844300A1 (en) * 2002-09-06 2004-03-12 Stihl Ag & Co Kg Andreas Operation of two-stroke engine with mixture induction for portable handheld work apparatus, involves drawing fluid into transfer channels, storing inducted fluid in transfer channels, and adjusting lambda of air-fuel mixture in crankcase
US6851402B2 (en) 2002-05-08 2005-02-08 Andreas Stihl Ag & Co. Kg Two-stroke engine and method for operating the same
US6899067B2 (en) 2002-06-29 2005-05-31 Andreas Stihl Ag & Co. Kg Two-stroke engine and method of operating the same
WO2010063048A1 (en) 2008-12-02 2010-06-10 Kirchberger, Roland Two-cycle combustion engine
US20140116392A1 (en) * 2012-10-31 2014-05-01 Electro-Motive Diesel, Inc. Fuel system for a dual-fuel engine
WO2015113096A1 (en) 2014-01-30 2015-08-06 Roland Kirchberger Method for operating a two-stroke otto engine
JP2020506329A (en) * 2017-02-13 2020-02-27 ケーティーエム アーゲーＫｔｍ Ａｇ Two-stroke internal combustion engine

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US4374568A (en) * 1981-02-13 1983-02-22 Sonoco Products Company Composite container with compressed body wall portion
EP0474623B1 (en) * 1990-09-07 1994-04-13 Franz Dipl.Ing.Dr. Laimböck Externally ignited two stroke internal combustion engine with crankcase scavening
US5762040A (en) * 1997-02-04 1998-06-09 Brunswick Corporation Cylinder wall fuel injection system for loop-scavenged, two-cycle internal combustion engine
US5791304A (en) * 1997-02-13 1998-08-11 Brunswick Corporation Cylinder wall fuel injection system for cross-scavenged, two-cycle combustion engine
US6092494A (en) * 1998-01-27 2000-07-25 Brunswick Corporation Controlled pressure rise in two-cycle internal combustion engine having cylinder wall fuel injection
US6079379A (en) 1998-04-23 2000-06-27 Design & Manufacturing Solutions, Inc. Pneumatically controlled compressed air assisted fuel injection system
US6293235B1 (en) 1998-08-21 2001-09-25 Design & Manufacturing Solutions, Inc. Compressed air assisted fuel injection system with variable effective reflection length
US6273037B1 (en) 1998-08-21 2001-08-14 Design & Manufacturing Solutions, Inc. Compressed air assisted fuel injection system
US6729275B2 (en) 1999-02-05 2004-05-04 Avl List Gmbh Two-stroke internal combustion engine with crankcase scavenging
US6539900B2 (en) 1999-02-05 2003-04-01 Avl List Gmbh Two-stroke internal combustion engine with crankcase scavenging
US6691649B2 (en) 2000-07-19 2004-02-17 Bombardier-Rotax Gmbh Fuel injection system for a two-stroke engine
WO2016043312A1 (en) * 2014-09-18 2016-03-24 株式会社Ihi Reciprocating engine

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DE1272619B (en) * 1959-06-22 1968-07-11 Dr Friedrich Stuempfig Fuel feeding device for internal combustion engines with fuel vaporization
DE1231482B (en) * 1963-02-12 1966-12-29 Wilhelm Schindele Device for introducing the fuel in high-speed internal combustion engines, in particular with mixture compression and external ignition
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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2692625A1 (en) * 1992-06-18 1993-12-24 Stihl Andreas Two-stroke engine for chain saws.
EP0661431A3 (en) * 1993-12-28 1995-09-20 Yamaha Motor Co Ltd Method for supplying air and injecting fuel into a combustion chamber of an internal combustion engine, in particular a two-cycle engine and internal combustion engine.
WO1998038419A1 (en) * 1997-02-28 1998-09-03 Bimota S.P.A. A direct electronic fuel injection system for two-stroke internal combustion engines
WO2001069544A1 (en) 2000-03-14 2001-09-20 British Telecommunications Public Limited Company Secure services
US6851402B2 (en) 2002-05-08 2005-02-08 Andreas Stihl Ag & Co. Kg Two-stroke engine and method for operating the same
US6899067B2 (en) 2002-06-29 2005-05-31 Andreas Stihl Ag & Co. Kg Two-stroke engine and method of operating the same
FR2844300A1 (en) * 2002-09-06 2004-03-12 Stihl Ag & Co Kg Andreas Operation of two-stroke engine with mixture induction for portable handheld work apparatus, involves drawing fluid into transfer channels, storing inducted fluid in transfer channels, and adjusting lambda of air-fuel mixture in crankcase
US6912979B2 (en) 2002-09-06 2005-07-05 Andreas Stihl Ag & Co. Kg Method for operating a two-stroke engine having mixture induction
WO2010063048A1 (en) 2008-12-02 2010-06-10 Kirchberger, Roland Two-cycle combustion engine
AT507635B1 (en) * 2008-12-02 2013-08-15 Kirchberger Roland Dipl Ing Dr Techn TWO STROKE COMBUSTION ENGINE
US20140116392A1 (en) * 2012-10-31 2014-05-01 Electro-Motive Diesel, Inc. Fuel system for a dual-fuel engine
US9046068B2 (en) * 2012-10-31 2015-06-02 Electro-Motive Diesel, Inc. Fuel system for a dual-fuel engine
WO2015113096A1 (en) 2014-01-30 2015-08-06 Roland Kirchberger Method for operating a two-stroke otto engine
AT515564A1 (en) * 2014-01-30 2015-10-15 Kirchberger Roland Dipl Ing Dr Techn Method for operating a two-stroke gasoline engine
AT515564B1 (en) * 2014-01-30 2016-03-15 Kirchberger Roland Dipl Ing Dr Techn Method for operating a two-stroke gasoline engine
CN105917106A (en) * 2014-01-30 2016-08-31 罗兰.柯克伯格 Method for operating a two-stroke otto engine
JP2020506329A (en) * 2017-02-13 2020-02-27 ケーティーエム アーゲーＫｔｍ Ａｇ Two-stroke internal combustion engine
US11149676B2 (en) 2017-02-13 2021-10-19 Ktm Ag Two-stroke internal combustion engine

Also Published As

Publication number Publication date
AT397695B (en) 1994-06-27
JPS6473167A (en) 1989-03-17
JPH0737765B2 (en) 1995-04-26
EP0302045B2 (en) 1994-11-17
DE3868760D1 (en) 1992-04-09
ATA193787A (en) 1993-10-15
EP0302045B1 (en) 1992-03-04
EP0302045A3 (en) 1990-01-17

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