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Patent

Fuel-injection valve

Guenter Dantes1, Detlef Nowak1
07 May 2002-
TL;DR: In this article, a high-pressure injection valve for directly injecting fuel into a combustion chamber of a compressed-mixture, spark-ignition internal combustion engine is described, and a slit-type flow outlet is formed between the slit-forming element and a front face of the valve seat body.
Abstract: The invention relates to a fuel-injection valve, in particular a high-pressure injection valve for directly injecting fuel into a combustion chamber of a compressed-mixture, spark-ignition internal combustion engine. Said valve is characterised in that an outlet opening (23) is provided downstream of the valve seat (20), the downstream end of said opening having a slit-forming element (30) that to a great extent closes the outlet opening (23). A slit-type flow outlet (35), through which a fuel spray can be discharged in a fan-type jet, is formed between the slit-forming element (30) and a front face (34) of the valve seat body (16).
Citations
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Patent
05 Oct 2004
TL;DR: In this article, a fuel injection valve is provided that includes a valve seat member (3) having a conical valve seat (8), and a valve hole (7 ) formed through a central part of the valve seat, a valve body (18) working in cooperation with the valve, and an injector plate (10) joined to the valve member and having a plurality of fuel injection holes (11 ) radially outwardly displaced from the valve hole.
Abstract: A fuel injection valve is provided that includes a valve seat member ( 3 ) having a conical valve seat ( 8 ) and a valve hole ( 7 ) formed through a central part of the valve seat ( 8 ), a valve body ( 18 ) working in cooperation with the valve seat ( 8 ), and an injector plate ( 10 ) joined to the valve seat member ( 3 ) and having a plurality of fuel injection holes ( 11 ) radially outwardly displaced from the valve hole ( 7 ), a diffusion chamber ( 39 ) providing communication between the valve hole ( 7 ) and the fuel injection holes ( 11 ) being provided between the valve seat member ( 3 ) and the injector plate ( 10 ), wherein the diffusion chamber ( 39 ) formed between the valve seat member ( 3 ) and the injector plate ( 10 ) is in an annular shape, has a diameter that is larger than that of the valve hole ( 7 ), and has inner ends of the fuel injection holes ( 11 ) opening therein, and a plurality of fuel passages ( 42 a , 42 b ) are disposed within the valve hole ( 7 ), the plurality of fuel passages ( 42 a , 42 b ) reversing within the valve hole ( 7 ) fuel that has passed through the valve seat ( 8 ) and guiding the fuel to the diffusion chamber ( 39 ). This enables atomization of injected fuel to be promoted and penetrability to be improved for the fuel injection valve.

511 citations

Patent
25 Feb 2005
TL;DR: In this article, an injector used for an internal combustion engine is described, in which a favorable magnetic attraction force is obtained to reduce a controllable minimum injection amount of a fuel injection amount.
Abstract: The invention relates to an injector used for an internal combustion engine, in which a favorable magnetic attraction force is obtained to reduce a controllable minimum injection amount of a fuel injection amount. In a fuel injection valve in which a fixed core (107) and a moving element (114) is contained inside a pipe-shaped member (101), and a coil (105) and a yoke (103) are provided on an outer side thereof, a space for placing the coil (105) is placed so that an inner circumference length in a vertical section of the space becomes smaller than an outside diameter of the yoke (103), or a height of the space in an axial direction of the fixed core (107) becomes smaller than a diameter of the fixed core (107).

199 citations

Patent
Akinori Harata1, Yukio Sawada1
26 Apr 1996
TL;DR: A fuel injector has a chamber between a valve body and a plate in which a plurality of through holes are formed as mentioned in this paper, and fuel flows along an inner inclined surface of the valve body turns to the through holes and flows into the through hole from all directions and collides with each other at inlets of the throughhole.
Abstract: A fuel injector has a chamber between a valve body and a plate in which a plurality of through holes are formed. The chamber has a diameter larger than that of an opening of the valve body. The through holes are opened at an outer chamber area shaded by the valve body are distanced from an outer wall of the chamber more than a diameter of the through hole. Fuel flowing along an inner inclined surface of the valve body turns to the through holes and flows into the through hole from all directions and collides with each other at inlets of the through hole. Therefore, injected fuel has a lot of turbulences and is finely atomized.

135 citations

Patent
24 Oct 2012
TL;DR: In this article, a valve assembly for an injection valve is described, where the valve body is axially movable relative to the valve needle and a permanent magnet is arranged in the cavity at a position adjacent to the position of the armature when the needle is in its closing position.
Abstract: The invention concerns a valve assembly (11) for an injection valve (10), comprising a valve body (14) including a central longitudinal axis (L), the valve body (14) comprising a cavity (18) with a fluid inlet portion (42) and a fluid outlet portion (40), a valve needle (20) axially movable in the cavity (18), the valve needle (20) preventing a fluid flow through the fluid outlet portion (40) in a closing position and releasing the fluid flow through the fluid outlet portion (40) in at least one further position, an upper retainer (23) being arranged in the cavity (18) and being fixedly coupled to the valve needle (20), and an electro-magnetic actuator unit (36) being designed to actuate the valve needle (20), the electro-magnetic actuator unit (36) comprising an armature (21), which is arranged in the cavity (18) and which is axially movable relative to the valve needle (20), the armature (21) being designed to be coupled to the upper retainer (23) when the valve needle (20) is actuated to leave the closing position, wherein a permanent magnet (22) is arranged in the cavity (18) at a position adjacent to the position of the armature (21), when the valve needle (20) is in its closing position. The invention also concerns an injection valve comprising such a valve assembly.

94 citations

Patent
06 Mar 2014
TL;DR: In this article, the phase angle of force applied to the primary oscillation system by the secondary oscillator is also staggered from that of the force applied by the SOS, which in turn makes it possible to achieve very accurate fuel-injection control.
Abstract: A fuel-injection valve includes a fuel-injection hole, a valve element and a valve seat for opening and closing the fuel-injection hole, a force-applying member for applying force to the valve element in a direction of motion of the valve element, and a drive unit for applying force to the valve element in the direction opposite to that of the force applied by the force-applying member; wherein a secondary oscillation system, which interacts with a primary oscillation system including the valve element and the force-applying member, is added to the primary oscillation system, and the phase angle of force applied to the primary oscillation system by the secondary oscillation system is also staggered from that of force applied to the primary oscillation system, which is other than the force applied to the primary oscillation system by the secondary oscillation system, whereby the bouncing of the valve element during opening and closing of the valve is reduced, which in turn makes it possible to achieve very accurate fuel-injection control.

88 citations

References
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Patent
05 Oct 2004
TL;DR: In this article, a fuel injection valve is provided that includes a valve seat member (3) having a conical valve seat (8), and a valve hole (7 ) formed through a central part of the valve seat, a valve body (18) working in cooperation with the valve, and an injector plate (10) joined to the valve member and having a plurality of fuel injection holes (11 ) radially outwardly displaced from the valve hole.
Abstract: A fuel injection valve is provided that includes a valve seat member ( 3 ) having a conical valve seat ( 8 ) and a valve hole ( 7 ) formed through a central part of the valve seat ( 8 ), a valve body ( 18 ) working in cooperation with the valve seat ( 8 ), and an injector plate ( 10 ) joined to the valve seat member ( 3 ) and having a plurality of fuel injection holes ( 11 ) radially outwardly displaced from the valve hole ( 7 ), a diffusion chamber ( 39 ) providing communication between the valve hole ( 7 ) and the fuel injection holes ( 11 ) being provided between the valve seat member ( 3 ) and the injector plate ( 10 ), wherein the diffusion chamber ( 39 ) formed between the valve seat member ( 3 ) and the injector plate ( 10 ) is in an annular shape, has a diameter that is larger than that of the valve hole ( 7 ), and has inner ends of the fuel injection holes ( 11 ) opening therein, and a plurality of fuel passages ( 42 a , 42 b ) are disposed within the valve hole ( 7 ), the plurality of fuel passages ( 42 a , 42 b ) reversing within the valve hole ( 7 ) fuel that has passed through the valve seat ( 8 ) and guiding the fuel to the diffusion chamber ( 39 ). This enables atomization of injected fuel to be promoted and penetrability to be improved for the fuel injection valve.

511 citations

Patent
12 Feb 1987
TL;DR: In this article, a tapered valve seat surface (16 or 16a) located in an end-cup (20 or 20a) of the fuel injection nozzle body (10), in which at least one spray orifice (22) is provided.
Abstract: Fuel injection nozzle for internal combustion engines with a tapered valve seat surface (16 or 16a) located in an end-cup (20 or 20a) of the nozzle body (10), in which at least one spray orifice (22) is provided. The outer wall region (30 or 44) of the end-cup (20 or 20a) which lies opposite the valve seating surface (16 or 16a) is of a lesser hardness than that of the inner wall region (18 or 18a) which forms the valve seating surface (16 or 16a). If the spray orifice (22) emerges from a blind hole (32), the outer wall region (40) of the end cup (20a) which surrounds the blind hole (32) should preferably also have a lesser hardness than that of the opposed inner wall region (42). The central wall region (28 or 28a) which lies between these should preferably have an even lesser hardness than that of the outer wall region (30 or 40, 44). In this way it is ensured that the end cup (20 or 20a) of the nozzle body (10 or 10a) can be provided altogether with a greater strength than with a known design, without the valve seat surface losing any of its heardness and without any marked decrease in the protection afforded to the outer wall region (30 or 40, 44) of the end cup (20 or 20a) against abrasive wear and tear.

384 citations

Patent
25 May 1994
TL;DR: In this paper, a solenoid valve is used to detect the stroke moment of the needle needle as a precise signal of the commencement and termination of the injection and transmits it to the control device, where this actual value is compared with a desired value from performance characteristics and, if necessary, results in a correction of the controlling of the valve.
Abstract: A fuel-injection device has a pump working chamber (7) which can be supplied and discharged by means of a fuel line (13) provided with a solenoid valve (23). The pump working chamber (7) is connected to a fuel-injection valve (33). Control of the fuel injection is achieved by means of the opening or closing of the solenoid valve (23) during the delivery stroke of the pump piston (5). The solenoid valve (23) is controlled by a control device (51). A needle stroke transducer (61) is disposed at the nozzle needle of the fuel-injection valve (33) which, after a limit value is exceeded, detects the stroke moment of the nozzle needle as a precise signal of the commencement and termination, and therefore the quantity, of the fuel injection, and transmits it to the control device (51) where this actual value is compared with a desired value from performance characteristics and, if necessary, results in a correction of the controlling of the solenoid valve (23).

313 citations

Patent
11 Jul 2002
TL;DR: In this paper, the damping path is embodied such and connected in such a way to the filling path that the fuel positively displaced from a damping chamber via damping throttle in an injection event reaches the fillingpath of the pressure booster pressure chamber via the damped path.
Abstract: A fuel injection system for an internal combustion engine including a fuel injector which can be subjected to fuel at high pressure and is actuatable via a metering valve device by which the pressure in a pressure booster control chamber is controllable such that the pressure in a pressure booster pressure chamber, defined by a pressure booster piston, that can be filled with fuel from the high-pressure fuel source via a filling path in which a check valve is disposed and that is in communication with an injection valve member pressure chamber, is increased by the pressure booster piston such that an injection valve member opens for injecting fuel, whereupon fuel is positively displaced out of a damping chamber via a damping path, in which a damping throttle is disposed. To assure stable injection performance, the damping path is embodied such and connected in such a way to the filling path that the fuel positively displaced from the damping chamber via the damping throttle in an injection event reaches the filling path of the pressure booster pressure chamber via the damping path.

291 citations

Patent
Thomas Kuegler1, Hasiman Üsküdar1
22 Mar 2002
TL;DR: In this paper, a Ventilhohlnadel (15) is angeordnet, die eine ausere Ventildichtflache (30) aufweist, with der sie mit dem auseren Ventilsitz (107) zusammenwirkt, and so die Offnung der wenigstens einen ausesren Einspritzoffnung (10) steuert.
Abstract: Kraftstoffeinspritzventil fur Brennkraftmaschinen mit einem in einem Ventilkorper (1) ausgebildeten auseren Ventilsitz (107), der eine Konusform mit einem auseren Offnungswinkel (a) aufweist und von dem wenigstens eine ausere Einspritzoffnung (10) abgeht. Weiter ist ein innerer Ventilsitz (207) ausgebildet, der ebenfalls eine Konusform mit einem inneren Offnungswinkel (b) aufweist und von dem wenigstens eine innere Einspritzoffnung (12) abgeht. Im Ventilkorper (1) ist eine Ventilhohlnadel (15) angeordnet, die eine ausere Ventildichtflache (30) aufweist, mit der sie mit dem auseren Ventilsitz (107) zusammenwirkt und so die Offnung der wenigstens einen auseren Einspritzoffnung (10) steuert. In der Ventilhohlnadel (15) ist eine Ventilnadel (17) angeordnet, die mit einer inneren Ventildichtflache (32) mit dem inneren Ventilsitz (207) zur Steuerung der wenigstens einen inneren Einspritzoffnungen (12) zusammenwirkt, wobei die Offnungswinkel (a; b) des inneren Ventilsitzes (207) und des auseren Ventilsitzes (107) verschieden sind.

267 citations