Abstract:
Moteur à combustion interne à injection directe à allumage par compression comprenant au moins un cylindre (10), une culasse (12) portant des moyens d'injection de combustible (14) projetant le combustible selon au moins deux nappes (36, 38) de jets de combustible d'angles de nappe différents (A1, A2), un piston (1 6) coulissant dans ce cylindre, une chambre de combustion (34) délimitée sur un côté par la face supérieure (44) du piston comportant un téton (48) s'érigeant en direction de la culasse et disposé au centre d'un bol concave (46) avec au moins deux zones de mélange (Z1, Z2), et des moyens de refroidissement (76) du piston logés dans la matière du piston. Selon l'invention, les moyens de refroidissement comprennent au moins une galerie (78, 82) circonférentielle concentrique au bol (46) du piston et disposée en regard d'au moins une zone de mélange (Z1, Z2).
Abstract:
Es wird eine Vorrichtung zum Vernebeln oder Versprayen oder Einspritzen von Flüssigkeit in einen Betriebsraum, wobei mindestens eine Düse mit wenigstens einem Strahlkanal zur Erzeugung wenigstens eines Flüssigkeitssprays vorgesehen ist, vorgeschlagen, womit die Verteilung der Flüssigkeit im Betriebsraum verbessert wird und insbesondere höhere Anforderungen an die Abgasqualität bei der Verbrennung von Kraftstoff im Brennraum erfüllt werden können. Dies wird erfindungsgemäß dadurch erreicht, dass wenigstens eine Nahfeld-Düse zur Erzeugung eines Nahfeld-Flüssigkeitssprays (7) und dass wenigstens eine Weitstrahl-Düse zur Erzeugung eines Weitstrahl-Flüssigkeitssprays (6) vorgesehen sind, wobei eine Länge des Nahfeld-Flüssigkeitssprays (7) kleiner als eine Länge des Weitstrahl-Flüssigkeitssprays (6) ist.
Abstract:
La présente invention concerne un moteur à combustion interne à injection directe à allumage par compression comprenant au moins un cylindre (10), une culasse (12) portant des moyens d'injection de combustible (14), un piston (16) coulissant dans ce cylindre, une chambre de combustion (34) délimitée sur un côté par la face supérieure (44) du piston comportant un téton (48) s'érigeant en direction de la culasse et disposé au centre d'un bol concave (46), ledit moteur comportant, des moyens d'injection projetant du combustible selon au moins deux nappes de jets de carburant d'angle de nappe différents (A1, A2), une nappe inférieure (36) d'axe de jet C1 et une nappe supérieure (38) d'axe de jet C2, au moins deux zones de mélange (Z1, Z2) de la chambre de combustion. Selon l'invention, l'une des zones comporte un volume torique (64) de centre B dans lequel sont injectés les jets de combustible (40) de la nappe inférieure d'une manière telle que l'axe C1 des jets de la nappe inférieure soit situé entre le centre B et le téton (48).
Abstract:
Kraftstoffeinspritzventil (1) für Brennkraftmaschinen mit einem Gehäuse (2), in dem ein Druckraum (6) ausgebildet ist, von dem wenigstens eine Einspritzöffnung (8) ausgeht. Im Druckraum (6) ist eine Ventilnadel (10) angeordnet, die durch ihre Längsbewegung die wenigstens eine Einspritzöffnung (8) öffnet und schließt, wobei zwischen der Ventilnadel (10) und der Wand des Druckraums (6) zumindest abschnittsweise ein Ringraum verbleibt, der mit Kraftstoff unter hohem Druck befüllbar ist und durch den Kraftstoff in Richtung der Einspritzöffnungen (8) fließen kann. Die Ventilnadel (10) ist mit einem Führungsabschnitt (14) im Druckraum (6) geführt und weist im Bereich des Führungsabschnitts (14) eine Längsbohrung (15) auf, durch die Kraftstoff von dem stromaufwärts des Führungsabschnitts (14) ausgebildeten Teil des Druckraums (6) in den stromabwärts des Führungsabschnitts (14) ausgebildeten Teil des Druckraums (6) fließen kann, wobei die Längsbohrung (15) über mehrere, in der Ventilnadel (10) ausgebildete Drosselbohrungen (20; 20') mit dem Druckraum (6) verbunden ist.
Abstract:
A method of operating an internal combustion engine is provided. An air/fuel ratio of the internal combustion engine is determined. At least one of a fuel injection quantity and an intake air flow is adjusted to provide an air/fuel ratio between about 15 and about 18. A compression ratio within a cylinder of the engine is determined. Droplet size of fuel provided by a fuel injector is adjusted based upon the compression ratio determined within the cylinder of the engine.
Abstract:
A dual fuel injection valve with concentric needles comprises an inner needle and an outer needle surrounding the inner needle, both needles being located inside the injection valve body. The valve is provided with a first set and a second set of orifices for separately injecting two different fuels directly into the combustion chamber of an internal combustion engine. The outer needle is fixed against rotation with respect to the injection valve body such that an interlace angle between the centerlines of the first series of orifices and second series of orifices is set at different predetermined angles to reduce methane emissions.
Abstract:
The present invention relates to a fuel injection valve for an internal combustion engine, in which both a main needle and a pilot needle are opened or only the pilot needle is opened by compressed high-pressure fuel oil or compressed air, thereby enabling main injection and pilot injection to be separately performed by the single fuel-injection valve. The fuel injection valve of the present invention comprises: a valve body; a nozzle coupled to a lower end of the valve body; a valve plate which is installed in the valve body and which has a compressed air chamber formed in the upper portion thereof; a main needle spindle arranged at the lower end of the valve plate; a main needle which is arranged in the nozzle, such that the main needle is positioned at the lower end of the main needle spindle, which opens a flow channel formed in the nozzle by supplied compressed fuel oil so as to inject fuel through a main injection hole, and which has a pilot supply port; a main needle spring interposed between the main needle spindle and the valve plate; a spring plate, the lower portion of which is inserted into the valve plate, and in the upper portion of which an air supply hole is formed so as to supply air into the compressed air chamber; a pilot needle spring positioned at the lower end of the spring plate; a pilot needle spindle positioned at the lower end of the pilot needle spring; and a pilot needle which is arranged at the main needle, such that the pilot needle is positioned at the lower end of the pilot needle spindle, and which operates by the fuel oil supplied through the pilot supply port of the main needle so as to open a flow channel formed in the main needle in order to inject fuel through a pilot injection hole.
Abstract:
A fuel injector (100) for use in an internal combustion engine comprising an injection nozzle (118) having a nozzle body (120) provided with a nozzle bore (130), a first valve needle (136) received within the nozzle bore and being engageable with a first seat region (137) to control fuel delivery through a first set of nozzle outlets (126), and a second valve needle (138) received within a valve bore (140) provided in the first valve needle and being engageable with a second seat region (144) arranged to control fuel delivery through a second set of nozzle outlets (128). A control chamber (184) for fuel is provided, preferably at least in part, between the first valve needle and the second valve needle, wherein movement of the first valve needle is responsive to fuel pressure in the control chamber, and wherein movement of the second valve needle is mechanically coupled to an armature of the first actuator arrangement (159), such that when the second valve needle lifts away from the second seating region, a fuel flow path is established between the control chamber and the second set of nozzle outlets. The fuel injector further includes a second actuator arrangement (200) that is operable to control fuel flow into the control chamber thereby regulating fuel pressure within the control chamber and, thus, movement of the first valve needle.
Abstract:
A fuel injection device (IA) includes: a needle valve; and a nozzle body (10) that accommodates the needle valve (20), which reciprocates along the axis (AX) of the nozzle body, and that includes a fuel passage having a fuel inlet port formed in a portion of the inner wall surface (13) of the nozzle body that comes in contact with the needle valve (20). The nozzle body (10) has a first fuel passage (14) and a second fuel passage (16). A merged injection hole (18), at which outlet ports of the first and second fuel passages (14, 16) merge, is formed in a surface of the nozzle body (10). The passage cross sectional area of the merged injection hole (18) is larger than the sum of the passage cross sectional areas of the first and second fuel passages (14, 16). The axis line (Ll) of the first fuel passage (14) and the axis line (L2) of the second fuel passage (16) intersect each other in the merged injection hole (18).
Abstract:
A method of mixed mode operation of an internal combustion engine (10) includes the steps of controlling a homogeneous charge combustion event timing in a given engine cycle, and controlling a conventional charge injection event to be at least a predetermined time after the homogeneous charge combustion event. An internal combustion engine (10) is provided, including an electronic controller (30) having a computer readable medium with a combustion timing control algorithm recorded thereon, the control algorithm including means for controlling a homogeneous charge combustion event timing and means for controlling a conventional injection event timing to be at least a predetermined time from the homogeneous charge combustion event.