Robert Boschgmbh

Ulrich Projahn

Nestor Rodriguez-Amaya

Roger Potschin

Rolf Leonhard

Kurt Frank

Juergen Gruen

Hubert Dettling

Alfred Knauer

Michael Huebel

Albert Gerhard

Werner Schmid

Wolfgang Soyer

Hellmut Kegel

Karl Mielich

Bernhard Lucas

Ulrich Gruen

Hans-Joachim Kuppel

Detlef Classe

Wolfgang Stolper

J&uuml;rgen Gruen

Klaus-Bernhard Laue

The fuel injection apparatus has one fuel pump for each cylinder, which has a pump piston, driven by the engine, that defines a pump work chamber, which communicates via a line with a fuel injection valve, disposed on the engine separately from the fuel pump, which valve has an injection valve member, by which at least one injection opening is controlled, and which is movable in the opening direction, counter to a closing force, by the pressure generated in the pump work chamber; a first electrically triggered control valve controls a communication of the line with a relief chamber. A second electrically triggered control valve is also disposed on the fuel injection valve and controls the pressure prevailing in a control pressure chamber of the fuel injection valve, which pressure urges the injection valve member in the closing direction.

Fuel injection system for internal combustion engines

The invention relates to a method for shaping the injection pressure course ( ) in injectors, which are used for instance in injection devices of injection systems in motor vehicles. The injection device includes a pump part ( ) and an injection nozzle part ( ). The pump part ( ) and injection nozzle part ( ) communicate with one another via a high-pressure line ( ). Control valves ( ) which are triggered by means of an actuator ( ) are contained in the pump part ( ). By the triggering by means of the actuator ( ), injection parameters during the preinjection phase ( ), pressure buildup phase ( ) and main injection phase ( ) are determined.

Method and device for shaping the injection pressure course in injectors

The fuel injection apparatus has one fuel pump for each cylinder of the engine, which pump has a pump piston, driven by the engine in a reciprocating motion, that defines a pump work chamber, which communicates via a line with a fuel injection valve, disposed on the engine separately from the fuel pump, which valve has an injection valve member, by which at least one injection opening is controlled, and which is movable in the opening direction, counter to a closing force, by the pressure generated in the pump work chamber, and at least one first electrically triggered control valve is provided, by which a communication of the pump work chamber with a relief chamber is controlled, and which is disposed near the fuel pump. A second electrically triggered control valve is provided, which is disposed near the fuel injection valve and by which the pressure prevailing in a control pressure chamber of the fuel injection valve is controlled, by which pressure the injection valve member is urged at least indirectly in the closing direction.

Fuel injection apparatus for internal combustion engines

The fuel injection apparatus for internal combustion engines has one fuel pump for each cylinder of the engine, which pump has a pump piston, driven by the engine in a reciprocating motion, that defines a pump work chamber to which fuel is delivered from a fuel tank and which communicates with a fuel injection valve that has an injection valve member by which at least one injection opening is controlled and which is movable in an opening direction counter to a closing force by the pressure generated in the pump work chamber, by means of a first electrically controlled control valve, a communication of the pump work chamber with a diversion chamber is controlled, and by means of a second electrically controlled control valve, the pressure prevailing in a control pressure chamber of the fuel injection valve is controlled, by which the injection valve member is urged at least indirectly in the closing direction. The diversion chamber is a pressure reservoir, in which an elevated pressure, compared to the pressure prevailing in the fuel tank, is maintained.

The fuel injection device has a fuel pump, which has a pump piston that is driven by an engine and delimits a pump working chamber, which is supplied with fuel from a fuel tank and is connected to a fuel injection valve, which has an injection valve member that controls at least one injection opening and can be moved by the pressure generated in the pump working chamber in an opening direction counter to a closing force. A first control valve controls a connection of the pump working chamber to a discharge chamber, and a second control valve controls the pressure prevailing in a control pressure chamber of the fuel injection valve. The connection of the pump working chamber further contains a pressure-holding valve, which maintains a pressure that is higher than the pressure prevailing in the discharge chamber.

Fuel injection device for an internal combustion engine having a pressure-holding valve

The invention relates to an arrangement for injecting fuel, which is at high pressure, into an internal combustion engine. An injector ( ) encloses a pressure chamber ( ), from which a high-pressure line ( ) discharges into a control chamber ( ) of a nozzle needle ( ). Also contained in the injector ( ) are two control valves ( ), which on the outlet side communicate with regions ( ) of a lesser pressure level. One of the control valves ( ) that form the injection course ( ) contains a pressure compensation system ( ), by which the injection pressure course ( ) can be varied by varying the stroke length ( ) of the nozzle needle ( ).

Injection device comprising an actuator for controlling the needle stroke

A fuel injection device having a fuel pump for each cylinder of an internal combustion engine, which fuel pump has a pump piston that is driven into a stroke motion by the engine and delimits a pump working chamber, which is supplied with fuel from a fuel tank and is connected to a fuel injection valve, which has an injection valve member that controls at least one injection opening and can be moved by the pressure generated in the pump working chamber in an opening direction counter to a closing force. A first electrically controlled control valve controls a connection of the pump working chamber to a discharge chamber, and a second electrically controlled control valve controls the pressure prevailing in a control pressure chamber of the fuel injection valve, which pressure acts on the injection valve member in the closing direction. A third electrically controlled control valve controls an additional connection of the pump working chamber to the discharge chamber; this connection contains a pressure control valve that opens toward the discharge chamber.

Fuel injection device for an internal combustion engine

Fuel delivery device

A housing pan for receiving a fluid delivery pump for a delivery aggregate for delivering fuel from a fuel tank has a pan body, a unit forming a supply opening for flowing fluid and open into an interior of the pan body, a pan bottom, a unit forming a part-ring shaped flow passage located concentrically into an axis of a pan body in an interior of the pan body at an axial distance from the pan body, the flow passage having a passage entry which communicates with the supply opening and also having a passage wall which is located inwardly in a radial direction and is provided with a plurality of throughgoing slots, the throughgoing slots being spaced from one another over a length of the flow passage and extending in a longitudinal direction of the flow passage, the throughgoing slots having lower slot edges located closer to the pan bottom and arranged at least near a passage bottom.

Housing pan for supporting a fluid delivery pump

An arrangement for supplying fuel to an internal combustion engine of a motor vehicle has a supply tank, an aggregate which is located in the supply tank and a fuel delivery unit for supplying fuel from the supply tank to the internal combustion engine. The aggregate has a plurality of components extending along a delivery path of the fuel, is located in the supply tank, and is provided with a supporting element which carries a holding member for the components of the aggregate.

Arrangement for supplying fuel from supply tank to internal combustion

A device for removing solid particles, in particular soot particles, from the exhaust gas of internal combustion engines includes a centrifugal separator or cyclone 11 to separate the untreated gas flow 10 into coaxially removed pure gas flow 23 and a particle-enriched carrier gas flow 24 and includes a combustion device 12 for burning the solid particles carried in the carrier gas flow. In order to reduce the manufacturing costs and to obtain a compact, small-volume assembly the combustion housing 16 of the combustion device 12 is integrated in the collecting piece 133 of the cyclone housing 13 such that an annular channel 18 is left between the combustion hosuing 16 and the collecting piece 133 through which a carrier gas flow is passed so as to enter the combustion housing 16 at the end of the latter facing away from the interior of the cyclone housing 13, to pass through a filter 27 heated up above combustion temperature of the solid particles and to finally enter into the vortex core of the cyclone and be removed together with pure gas flow 23. The free end of the collecting piece is closed so as to prevent carrier gas from escaping.

Device for removing soot from diesel exhaust

Pilot burner especially for a device for burning soot in the exhaust gas of diesel engines, including a hollow cylindrical mixing chamber 10 and glow plug chamber 11 connected transversely thereto via an opening 12. A fuel supply pipe 28 ends into the glow plug chamber 11 and an air supply pipe 18 ends into the mixing chamber 10. In the area of the spiral incandescent filament 28, the glow plug is coaxially surrounded by a protective tube 26 made of wire fabric. The fuel supply pipe 28 ends in an orifice extension piece 27 which extends radially into the glow plug chamber 11. The protective tube 26 has a large surface so that the fuel hitting thereon uniformly evaporates. The protective tube 26 is welded to a sleeve 37 which is screwed into glow plug chamber 11 and can hence be easily replaced.

Pilot burner for a device for burning solids in the exhaust gas of

An apparatus for removing solid particles, especially soot particles, from the exhaust gases of an internal combustion engine includes a separator that divides the flow of exhaust gases into a largely particle-free primary flow and a particle-enriched secondary flow. The secondary flow is delivered to a disposal device, which has a combustion chamber and a pilot burner for producing a flame that burns off the solid particles. To improve the efficiency of the apparatus by reducing the heating output required, a filter is provided in the combustion chamber, which divides the combustion chamber into a filter pre-chamber and after-chamber. The burnoff flame of the pilot burner burns into the filter pre-chamber, and the burnoff gases are removed via an outlet opening disposed in the filter after-chamber. The secondary exhaust gas flow is delivered to the filter pre-chamber with a tangential inflow direction.

Apparatus for removing solid particles, especially soot particles, from

A pilot burner for a device for burning off solid particles, in particular soot particles, in the exhaust gas of internal combustion engines has a hollow-cylindrical mixture preparation chamber receiving a glow element and a hollow-cylindrical glow plug receiving chamber extending transversely to it and communicating with it through an opening. A fuel inflow line discharges into the receiving chamber and an air supply line discharges into the preparation chamber. To improve mixture preparation and largely avoid carbonization of the glow plug, the glow plug is coaxially surrounded in the vicinity of its coil at a radial distance by a protective sleeve. The fuel inflow line ends at an orifice fitting that protrudes radially into the receiving chamber and discharges immediately in front of the protective sleeve.

Pilot burner for an apparatus for burning off solid particles in the

A pilot burner for a device for burning off solid particles, especially soot particles, in the exhaust gas of internal combustion engines has a hollow-cylindrical mixture preparation chamber receiving a glow element and extending eccentrically thereto a hollow-cylindrical glow plug receiving chamber. The two chambers communicate with one another via an opening formed by piercing the chamber walls. A fuel inflow line discharges in the receiving chamber and an air supply line discharges into the preparation chamber. To improve the mixture preparation and largely avoid carbonization of the glow plug, the air supply line discharges into two inflow openings having a tangential direction; one inflow opening is located opposite the opening between the two chambers, and the other inflow opening is located near the end face of the preparation chamber having a mixture outlet opening. In obth inflow openings, the combustion air is introduced in the same direction.

Growing community of inventors

Leonberg, Germany

Ulrich Projahn