Abstract: An injector for introducing a gaseous fuel into a combustion chamber. A housing has an outflow opening that can be flowed through by the gaseous fuel. A valve element can be moved between a closed position in which the valve element sits on a valve seat to separate a first housing region from a second housing region and an open position in which the valve element is spaced apart from the valve seat. When moved out of the closed position into the open position, the valve element can be moved into the second housing region. The valve element has a valve body region that is disposed in the second housing region in both the closed position and the open position. The valve body region is domed at least in a partial region of the valve body region and/or is tapered in a direction pointing away from the valve seat.

Abstract: A method for operating an internal combustion engine, injects fuel directly into a combustion chamber as a main injection, a postinjection and optionally also as a preinjection. An injection nozzle with a plurality of injection bores effects the preinjection and the postinjection preferably which is carried out cyclically. To minimize wetting of the combustion chamber walls, during the postinjection the partial quantities of fuel and a lift of the nozzle needle of the injection nozzle are set so that, for each partial quantity of the postinjection injected into the combustion chamber, the reach of the respective fuel jet in the combustion chamber is limited and the reach is less than the distance to a combustion chamber boundary.

Abstract: A method for operating an internal combustion engine, injects fuel directly into a combustion chamber as a main injection, a postinjection and optionally also as a preinjection. An injection nozzle with a plurality of injection bores effects the preinjection and the postinjection preferably which is carried out cyclically. To minimize wetting of the combustion chamber walls, during the postinjection the partial quantities of fuel and a lift of the nozzle needle of the injection nozzle are set so that, for each partial quantity of the postinjection injected into the combustion chamber, the reach of the respective fuel jet in the combustion chamber is limited and the reach is less than the distance to a combustion chamber boundary.

Abstract: The invention relates to an internal combustion engine with a fuel injection device with an injection nozzle having a nozzle needle and a plurality of injection bores. The injection nozzle is arranged to inject fuel into the combustion space in the form of a plurality of fuel jets as a main injection, as a post-injection and/or a preinjection. The injection bores of the injection nozzle are arranged in at least two different separately activatable rows of holes, an operating stroke of the nozzle needle being set by control unit as a function of a piston position and/or an operating point of the engine, and the rows of holes of the injection nozzle different injection-hole cone angles.

Abstract: The invention relates to an internal combustion engine with a fuel injection device with an injection nozzle having a nozzle needle and a plurality of injection bores. The injection nozzle is arranged to inject fuel into the combustion space in the form of a plurality of fuel jets as a main injection, as a post-injection and/or a preinjection. The injection bores of the injection nozzle are arranged in at least two different separately activatable rows of holes, an operating stroke of the nozzle needle being set by control unit as a function of a piston position and/or an operating point of the engine, and the rows of holes of the injection nozzle different injection-hole cone angles.

Abstract: A method is provided for operating an internal combustion piston engine, in which fuel is injected directly into a working chamber in the form of a pre-injection and main injection by means of an injection nozzle with a plurality of injection holes. The pre-injection takes place in a clocked manner. In order to minimize the moistening of the walls of the combustion chamber, a higher fuel pressure prevails in an injection device during the main injection than during the pre-injection. Furthermore, optimum homogenization of the pre-injected quantity of fuel is obtained by restricting the range of the injected fuel jets while simultaneously maximizing the atomization of the fuel particles and reinforcing the disintegration of the fuel jets during the clocked pre-injection.

Abstract: An internal combustion engine has compression ignition, in which fuel is injected as a pre-injection and main injection directly into a working space by means of an injection nozzle having a plurality of injection holes, with the pre-jection taking place in a clocked manner. In order to minimize the moistening of the walls of the combustion chamber, a combustion chamber is provided, in which are arranged an injection nozzle in the region of a cylinder center axis in the cylinder head and a piston recess arranged in the piston head, with an approximately centrally situated piston recess projection being arranged in the piston recess. The stroke of a nozzle needle of the injection nozzle is set in such a manner that a restricting of the range of the injected fuel jets is obtained.

Abstract: An internal combustion engine has compression ignition, in which fuel is injected as a pre-injection and main injection directly into a working space by means of an injection nozzle having a plurality of injection holes, with the pre-jection taking place in a clocked manner. In order to minimize the moistening of the walls of the combustion chamber, a combustion chamber is provided, in which are arranged an injection nozzle in the region of a cylinder center axis in the cylinder head and a piston recess arranged in the piston head, with an approximately centrally situated piston recess projection being arranged in the piston recess. The stroke of a nozzle needle of the injection nozzle is set in such a manner that a restricting of the range of the injected fuel jets is obtained.

Abstract: In a method for operating an internal combustion engine in which fuel is injected directly into a combustion chamber in a pre-injection and a main fuel injection step, and, if appropriate, also in a post-injection step by means of an injection nozzle with a plurality of injection bores, the injection of fuel takes place in a timed fashion and, to limit pressure and temperature during combustion of the fuel in the combustion chamber, a quantity of water is introduced into the combustion chamber during or after the pre-injection step.

Abstract: A method is provided for operating an internal combustion piston engine, in which fuel is injected directly into a working chamber in the form of a pre-injection and main injection by means of an injection nozzle with a plurality of injection holes. The pre-injection takes place in a clocked manner. In order to minimize the moistening of the walls of the combustion chamber, a higher fuel pressure prevails in an injection device during the main injection than during the pre-injection. Furthermore, optimum homogenization of the pre-injected quantity of fuel is obtained by restricting the range of the injected fuel jets while simultaneously maximizing the atomization of the fuel particles and reinforcing the disintegration of the fuel jets during the clocked pre-injection.

Abstract: In a method for operating an internal combustion engine with direct fuel injection, the fuel injection includes at least two injections that are carried out at at least two different injection pressures.

Abstract: In a method for operating an internal combustion engine with direct fuel injection, the fuel injection includes at least two injections that are carried out at at least two different injection pressures.

Abstract: A method for generating a homogeneous mixture for auto-ignition internal combustion engines and for controlling the combustion process, the internal combustion engine having an injection system and at least one cylinder/piston unit connected to an intake device, includes the steps of: a) exhaust-gas recirculation of hot exhaust gas from a previous combustion cycle into the combustion space or into the intake device or exhaust-gas retention of this exhaust gas in the combustion space or in the intake device; b) injection of fuel by the injection system into the retained or recirculated hot exhaust gas in order to generate a homogeneous fuel/air mixture; and c) cooling of the homogenized fuel/air mixture by expansion cooling or by isentropic compression in the respective cylinder/piston unit and/or by expansion cooling or by external cooling of a fuel/air mixture homogenized in at least one further cylinder/piston unit and recirculation of the cooled fuel/air mixture into the intake device.

Abstract: A method for operating a reciprocating-piston internal combustion engine, having an injector nozzle operable by a single valve element and configured to directly inject a fuel into a combustion chamber and having a piston including a piston crown and a piston recess, includes the steps of injecting the fuel by the injector nozzle into the combustion chamber in the form of separated jets of the fuel having different inclinations relative to a top surface of the piston crown and selectively setting the inclinations of the fuel jets depending on an engine load.

Abstract: A method for operating a reciprocating-piston internal combustion engine with direct fuel injection.

Abstract: A method for generating a homogeneous mixture for auto-ignition internal combustion engines and for controlling the combustion process, the internal combustion engine having an injection system and at least one cylinder/piston unit connected to an intake device, includes the steps of:

Abstract: A method and apparatus for injecting a nitrogen-oxide-reducing agent into an exhaust stream that has an injector unit for controlled injection of a reducing agent into the exhaust stream and an injection element that incorporates a micromechanical spray jet element.

Abstract: In a fuel injection system for injecting fuel into a combustion chamber of an internal combustion engine by means of a dual fluid injector which includes a nozzle with a nozzle needle normally closing the nozzle and which has formed around the nozzle needle an annular space which is in communication with a fluid source and a pressure chamber in communication with the annular space and the working space of a plunger disposed in the injector so as to be movable between upper and lower end positions but being biased to its upper end position, the plunger working space is in communication with a fuel source via a fuel supply line which includes a control valve and an electromagnetically controlled valve is provided for controlling the admission of a hydraulic operating fluid to the plunger for moving the plunger into the working space for the ejection of the fuel and the fluid from the pressure chamber and the annular space around the nozzle and the fuel supply line includes an electronically controllable valve a

Abstract: In a fuel injection nozzle for an internal combustion engine with a fuel injection opening including a nozzle opening control needle with a body portion with discharge openings whose size depends on the axial displacement of the nozzle opening control needle and with means for limiting the axial displacement of the nozzle opening control needle, a hollow nozzle needle is disposed around the stem of the nozzle opening control needle and forms at its end a fuel control valve seat for controlling fuel flow to the fuel injection opening and a control space is provided at the end of the hollow nozzle needle opposite its valve seat which is in communication with a pressurized fuel supply for holding the hollow nozzle needle in a seated position but from which the pressure can be released to permit lifting of the hollow nozzle needle by pressurized fuel supplied to the seating area end of the hollow nozzle needle whereupon the pressurized fuel released through the fuel control valve displaces the nozzle opening cont

Abstract: In a fuel injection system for an internal-combustion engine which includes a dual-fluid nozzle which is supplied with fuel by a high-pressure pump and with water by a feed pump providing a substantially lower pressure than the high-pressure pump and which has disposed in a nozzle body a nozzle needle which is spring biased into a closing position where one end of the needle is seated on a valve seat, a fuel supply passage extends to an annular space around the valve needle and a branch passage leads to a control chamber formed at the other end of the valve needle and includes a solenoid valve for controlling the application of pressurized fluid to, and the release thereof from, the other end of the nozzle needle, an additional fluid line extends from the feed pump to the annular space and includes a check valve for permitting flow of additional fluid only toward the annular space and a pressure relief line in communication with the fuel supply passage via a control valve, and a control device is provided for