Abstract: A piston for a reciprocating piston machine includes a piston crown, a piston recess, and an annular groove formed in the piston crown. The annular groove extends in a radial direction of the piston outwards and a cross-section of the annular groove has a half-teardrop shape. The half-teardrop shape has a first radius and a second radius where the second radius is directly contiguous with the first radius outwards in the radial direction of the piston and where the second radius is greater than the first radius.

Abstract: A method for operating an internal combustion engine of a motor vehicle having a cylinder, the combustion chamber of which is delimited in the radial direction by a cylinder wall and in the axial direction by a piston and by a combustion chamber roof. The piston has an annularly peripheral piston stage which is arranged axially recessed in the piston compared with an annularly peripheral piston crown and which merges via an annularly jet splitter contour into a piston hollow arranged axially recessed in the piston in relation to the piston stage. An injector is allocated to the cylinder and via the injector several injection jets are simultaneously injected directly into the combustion chamber in a star shape for a combustion process.

Abstract: A method for operating an internal combustion engine of a motor vehicle having a cylinder, the combustion chamber of which is delimited in the radial direction by a cylinder wall and in the axial direction by a piston and by a combustion chamber roof. The piston has an annularly peripheral piston stage which is arranged axially recessed in the piston compared with an annularly peripheral piston crown and which merges via an annularly jet splitter contour into a piston hollow arranged axially recessed in the piston in relation to the piston stage. An injector is allocated to the cylinder and via the injector several injection jets are simultaneously injected directly into the combustion chamber in a star shape for a combustion process.

Abstract: A method for operating an internal combustion engine includes using a 3-front combustion method. When the fuel is injected into the combustion chamber the fuel flows through an injection element with a hydraulic flow of more than 1000 cubic centimeters per 60 seconds and under an injection pressure of 100 bar and 1 liter capacity per cylinder if the internal combustion engine is used in a truck application. The fuel flows through the injection element with a hydraulic flow of more than 1900 cubic centimeters per 60 seconds and under an injection pressure of 100 bar and 1 liter capacity per cylinder if the internal combustion engine is used in a car application.

Abstract: A method for operating an internal combustion engine involves using an injection valve to post-inject fuel into at least one cylinder of the internal combustion engine in order to help regenerate a particulate filter that is arranged in an exhaust system of the internal combustion engine, downstream of an oxidation catalyst. A closing moment of a discharge valve of a cylinder of the internal combustion engine is advanced when the temperature of the oxidation catalyst is in a first temperature range, and the post-injections are performed when the temperature of the oxidation catalyst is in a second temperature range, an upper limit of the first temperature range having a lower value that an upper limit of the second temperature range.

Abstract: A combustion process with auto-ignition for direct-injection internal combustion engines involves dividing injection jets at a jet divider contour into a first partial quantity, a second partial quantity, and third partial quantities. The first partial quantity enters into the piston cavity, the second partial quantity enters via the piston step into a region between the piston crown and the cylinder head, and the third partial quantities, starting from the respective injection jet, spread out on both sides in the peripheral direction in opposite directions along the piston step, and the respective third partial quantities collide with one another between two adjacent injection jets within the piston step and are deflected radially inwardly.

Abstract: An internal combustion engine (1), preferably for a motor vehicle, having at least one cylinder (2) which encloses a combustion chamber (3) and in which a piston (4) is situated in such a way that it may perform a stroke movement, and having at least one injector (5) per cylinder for injecting fuel into the combustion chamber (3). The respective injector (5) has multiple injection openings (9, 10) through which the fuel exits from the injector (5) and enters into the combustion chamber (3). To be able to react more fuel, first injection openings (9) and second injection openings (10) are situated relative to one another in such a way that first injection jets (15) from the first injection openings (9) reach the piston (4) essentially without contacting second injection jets (18) from the second injection openings (10).

Abstract: A method for operating an internal combustion engine involves using an injection valve to post-inject fuel into at least one cylinder of the internal combustion engine in order to help regenerate a particulate filter that is arranged in an exhaust system of the internal combustion engine, downstream of an oxidation catalyst. A closing moment of a discharge valve of a cylinder of the internal combustion engine is advanced when the temperature of the oxidation catalyst is in a first temperature range, and the post-injections are performed when the temperature of the oxidation catalyst is in a second temperature range, an upper limit of the first temperature range having a lower value that an upper limit of the second temperature range.

Abstract: A combustion process with auto-ignition for direct-injection internal combustion engines involves dividing injection jets at a jet divider contour into a first partial quantity, a second partial quantity, and third partial quantities. The first partial quantity enters into the piston cavity, the second partial quantity enters via the piston step into a region between the piston crown and the cylinder head, and the third partial quantities, starting from the respective injection jet, spread out on both sides in the peripheral direction in opposite directions along the piston step, and the respective third partial quantities collide with one another between two adjacent injection jets within the piston step and are deflected radially inwardly.

Abstract: An internal combustion engine (1), preferably for a motor vehicle, having at least one cylinder (2) which encloses a combustion chamber (3) and in which a piston (4) is situated in such a way that it may perform a stroke movement, and having at least one injector (5) per cylinder for injecting fuel into the combustion chamber (3). The respective injector (5) has multiple injection openings (9, 10) through which the fuel exits from the injector (5) and enters into the combustion chamber (3). To be able to react more fuel, first injection openings (9) and second injection openings (10) are situated relative to one another in such a way that first injection jets (15) from the first injection openings (9) reach the piston (4) essentially without contacting second injection jets (18) from the second injection openings (10).

Abstract: In a method for operating a direct-injection auto-ignition internal combustion engine and a correspondingly configured internal combustion engine including a piston top having integrally formed therein a piston recess which merges into an essentially annular stepped space and an injector forming injection jets directed toward the stepped space, the jets are deflected there in such a way that a first part quantity of fuel is directed in an axial direction and a radial direction into the piston recess, a second part quantity of fuel is deflected in the axial direction and the radial direction over the piston top and third part quantities of fuel are deflected into a circumferential direction so as to impinge one onto the other in the circumferential direction and to be deflected radially inwardly, the start of injection and the injection duration being coordinated with one another and with the crank angle of the internal combustion engine in such a way that the third part quantities of adjacent injection jets m

Abstract: In an internal combustion engine with auto-ignition in which the fuel is injected directly into the combustion chamber by means of a fuel injection nozzle in the form of multiple fuel jets, wetting of the combustion chamber-side cylinder head surface is minimized by recesses formed in the cylinder head whereby some of the fuel is reflected by the piston towards the cylinder head when the piston is in a position adjacent the cylinder head and directed at least partially into the recesses formed in the cylinder head.

Abstract: A fuel injection diesel internal-combustion engine, having a fuel injection nozzle and having a spring chamber for the pressure spring acting upon the nozzle needle. The spring chamber is constructed as a closed chamber without a leak oil connection and forms a space which is under a fuel pressure. The spring chamber fills with fuel, by way of a slide guide for the pressure linkage of the nozzle needle constructed as a throttling point. As the fuel pressure in the spring chamber rises above an operating pressure corresponding to the control position of the injection pump for the defined driving condition, the delivery time of the pump is prolonged for compensating the lowering of the injection quantity connected with the pressure rise in the spring chamber.

Abstract: In a fuel injection system for a multi-cylinder internal combustion engine with a cam-controlled high-pressure injection pump for transporting the fuel to a common fuel line (common rail), which acts as high-pressure storage and from which injection lines lead to injection nozzles and which possesses a solenoid valve control that determines the start of the feeding of the fuel, in every exposed fuel line which is an injection line between the common fuel line and an injection nozzle, a solenoid valve which controls the starting point for feeding fuel to the engine is arranged in close proximity to the common fuel line.