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Author

Friedrich Boecking

Bio: Friedrich Boecking is an academic researcher from Bosch. The author has contributed to research in topics: Injector & Internal combustion engine. The author has an hindex of 18, co-authored 442 publications receiving 2125 citations.


Papers
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Patent
Friedrich Boecking1
13 May 2004
TL;DR: In this paper, an injection nozzle for an internal combustion engine is described, which can control the injection of fuel through at least one first injection hole and at least two second injection holes.
Abstract: The invention relates to an injection nozzle (1) for an internal combustion engine, comprising a nozzle body (2) which comprises at least one first injection hole (3) and at least one second injection hole (4), a first nozzle needle (7) which is embodied as a hollow needle and which is guided in a first needle guide (6) of the nozzle body (2). Said nozzle needle can control the injection of fuel through the at least one first injection hole (3). Said injection nozzle also comprises a second nozzle needle (9) which is arranged in a coaxial manner on the first nozzle needle (7) and which can control the injection of fuel through the at least one second injection hole (4). In order to simplify control of the second nozzle needle (9), a first carrier contour (19) is formed on the first nozzle needle (7), said first carrier contour co-operating with a second carrier contour (20) formed on the second nozzle needle (9) when opening the first nozzle needle (7) according to a predetermined pre-stroke (24) and, during an opening movement occurring by means of the pre-stroke (24), the first nozzle needle (7) opens the second nozzle needle (9).

24 citations

Patent
Friedrich Boecking1
23 May 2003
TL;DR: A fuel injection device for an internal combustion engine comprising of a housing and at least one valve element is described in this article, where the valve element cooperates with a valve seat on an injection end of the housing.
Abstract: A fuel injection device (22) for an internal combustion engine comprising a housing (30) and at least one valve element (34, 36). Said valve element cooperates with a valve seat (46, 58) on an injection end of the housing (30). Several housing-side fuel outlet channels (64,68) are associated with the valve element (34,36). A flow chamber is provided in the region of the beginning of the fuel outlet channels (68). Said chamber is formed by an annular groove (66) which is concentric to the longitudinal axis of the valve element (36).

24 citations

Patent
Friedrich Boecking1
08 Sep 2004
TL;DR: In this article, the outer valve element, radially outward from the at least one fuel outlet opening associated with it, cooperates with a valve seat on the housing and can separate the fuel outlet from a high-pressure connection.
Abstract: A fuel injection device includes at least two valve elements, disposed in a housing and coaxial with one another, with at least one fuel outlet opening associated with each valve element. On the outer valve element, radially outward from the at least one fuel outlet opening associated with it, there is a first sealing edge which cooperates with a valve seat on the housing and can separate the at least one fuel outlet opening from a high-pressure connection. An additional sealing edge is provided on the outer valve element, between the at least one fuel outlet opening associated with it and the inner valve element.

23 citations

Patent
Friedrich Boecking1
02 Dec 2004
TL;DR: In this article, a fuel injector for injecting fuel into a combustion chamber of a combustion engine is described, in which the piezo actuator (9) actuates a first multiplying piston (11) in which a second multiplying piston that is connected to the injection valve member (5) is guided.
Abstract: The invention relates to a fuel injector for injecting fuel into a combustion chamber (30) of a combustion engine, comprising an injector body (2) and a nozzle holder (3) in which an injection valve member (5) is movably lodged, said member having a seat (28) that releases or closes the injection holes (29) and said injection valve member (5) being actuated by means of a piezo actuator (9). The invention is characterized in that the piezo actuator (9) actuates a first multiplying piston (11) in which a second multiplying piston (19) that is connected to the injection valve member (5) is guided.

22 citations

Patent
Bernd Dittus1, Friedrich Boecking1
09 Oct 1997
TL;DR: In this article, the conical valve sealing surface was used to control the control of an injection cross-section, sliding on a pin of a static insert body, with an inner guide.
Abstract: With the conical valve sealing surface (15), the arrangement works in conjunction with a valve sealing surface (19) on the valve body (1) for control of an injection cross-section. The valve member (11), via an inner guide, can slidingly move on a pin (9) of a static insert body (7).

22 citations


Cited by
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Patent
30 Mar 1999
TL;DR: In this paper, a plurality of recipient processors (14, 15, 16) located at geographically remote locations with respect to each other and connected for communication with an information provider processor (12), over the communications network.
Abstract: A communication system includes a plurality of recipient processors (14, 15, 16) located at geographically remote locations with respect to each other and connected for communication with an information provider processor (12), over the communications network. The provider (12) and recipient processors (14, 15, 16) may comprise respective computers coupled for communication on the Internet or WWW. The provider processor is capable of providing information from any suitable source, by communicating such information over a communications network. However, access to the information by the recipient processors is controlled, based on the geographic location or region of the recipient processors. Each recipient processor is operably associated with a positioning system for providing geographic location information corresponding to the location or region in which the positioning system is located, such as a global positioning system GPS (20, 21, 22). The geographic position information is used to determine whether or not the processor requesting the information is within a restricted or non-restricted region.

417 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

Patent
Hiroshi Inoue1
29 Mar 2012
TL;DR: In this article, an opening sectional area of the communication hole is defined in such a manner that a fuel discharged amount decreases as an energization start time of a coil is delayed.
Abstract: Between a movable core chamber and a fuel supply passage, a needle guide slidably supports a needle fixed to a movable core. The needle guide has a communication hole which fluidly connects the movable core chamber and the fuel supply passage. An opening sectional area of the communication hole is defined in such a manner that a fuel discharged amount decreases as an energization start time of a coil is delayed. In a suction stroke, it is restricted that the movable core and the needle bounce toward the fixed core after the needle biases a suction valve toward a stopper by means of a biasing force of a second spring. A relationship between the energization start time of the coil and the fuel discharged amount is properly maintained, so that the fuel discharged amount of the high-pressure pump can be controlled correctly.

225 citations

Patent
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).

186 citations