摘要:
A mobile valve member (48) designed to be arranged in the nozzle body (30) of a fuel (F) injector (10), extends along a main axis (XI) and comprises a piston (50) formed of a male first cylinder (62) of effective diameter (DE) forming the top end of the mobile member (48) and of a second cylinder (64) provided with an internal cylindrical bore (68) of diameter (DE) and a shutoff member (52) comprising a male cylindrical shaft (84) of effective diameter (DE) which is a sliding fit in the internal bore (68), and of a member (88) extending as far as a pointed end provided with a mobile seat (56) and forming the bottom end of the mobile member (48). The mobile member (48) is hydraulically balanced and has a length between its top end and its bottom end that is variable because of the sliding of the cylindrical shaft (84) in the internal bore (68) of the piston.
摘要:
Membre de vanne (14) d'un injecteur de carburant (10), comprenant : -un corps cylindrique (28) à une première extrémité (30) duquel est formé un obturateur de vanne (32) définissant une face mâle conique (34) adaptée à coopérer avec une face complémentaire (36) femelle d'un siège de vanne (38) intégré dans un corps de buse (16), le corps cylindrique (28) et l'obturateur (32) se raccordant selon une ligne d'intersection (40), caractérisé en ce que le membre de vanne (14) comprend au moins une première gorge (50) annulaire agencée adjacente à la ligne d'intersection (40).
摘要:
A long injector (1) for fuel injection into an internal combustion engine comprises a base portion (3) and an extension portion (5) and a longitudinal axis (L), wherein the base portion (3) and the extension portion (5) are at least partially arranged in a plastic housing (19), the plastic housing (19) comprising a cavity, an electrical connection between the base portion (3) and the extension portion (5) being arranged inside the cavity, walls of the cavity forming a first longitudinal protrusion (15) of the plastic housing (19), wherein the plastic housing (19) comprises a second longitudinal protrusion (21), the second longitudinal protrusion (21) being arranged essentially opposite of the first longitudinal protrusion (15).
摘要:
A variable orifice fuel injector has an inward opening needle valve and an outward opening needle valve and has means to directly inject two types of fuels independently and collectively. Both needle valves are fully contained in a nozzle body, with a co-axial smaller needle valve at least partially being contained in a larger needle valve.
摘要:
A fuel injector for an internal combustion engine is disclosed. The fuel injector is installable in a cylinder head bore of a cylinder head of the engine and has a body region arranged to be received within the cylinder head bore, and a head region arranged to extend outside the cylinder head bore to protrude from the cylinder head when the injector is installed in the cylinder head bore. The injector includes a first valve needle arranged to control the injection of a gaseous fuel from a first outlet, a second valve needle arranged to control the injection of a liquid fuel from a second outlet, a gaseous fuel inlet for admitting the gaseous fuel to the injector, and a liquid fuel inlet port for admitting the liquid fuel to the injector. The gaseous fuel inlet is disposed in the body region of the injector, and the liquid fuel inlet port is disposed in the head region of the injector. The injector can also include an internal accumulator volume so that an external fuel rail is not necessary.
摘要:
A method of operating a solenoid actuator is described. The solenoid actuator comprises an armature, pole piece(s), electromagnet coil(s) arranged, in response to energisation, to cause travel of the armature between first and second positions along a direction of travel. The method comprises applying, in a cycle, drive waveform(s) to the electromagnet coil(s), the drive waveform(s) including turn-on drive waveform(s) having profile(s) and duration so as to position the armature at a position between the first and second positions and at which the armature is substantially at rest, obtaining measurement(s) of back emf and/or current and/or resistance from the electromagnet coil(s) and adjusting the drive waveform(s) applied to the electromagnetic coil in the cycle and/or adjusting drive waveforms(s) applied to the electromagnetic coil in a subsequent cycle using the measurement(s).