Abstract: In a turbocharger for an internal combustion engine of a motor vehicle, comprising a turbine housing having first and second spiral passages, each of which is connected to at least one exhaust gas line of an exhaust train of the internal combustion engine and a turbine wheel disposed within a rotor chamber of the turbine housing and connected to a compressor impeller via a drive shaft for rotation with the impeller, the exhaust gas of the internal combustion engine can be routed through the spiral passages for admission to the turbine wheel via the first and second spiral passages which have different wrap angles around the turbine wheel.

Abstract: In an internal combustion engine comprising an exhaust gas turbocharger, which includes a compressor with a compressor wheel arranged in an inlet tract of the internal combustion engine and a turbine with a turbine wheel coupled rotationally to the compressor wheel and arranged in an at least two-path exhaust gas tract of which is connected to an exhaust gas guide section of the turbine including at least a first spiral channel coupled to the first exhaust path and a second spiral channel coupled to a second exhaust gas path, two guide vane elements are arranged upstream of the turbine wheel and downstream of respective spiral channels which are formed corresponding to a first degree of asymmetry A1 determined as a quotient ? of a first mass flow parameter and a second mass flow parameter which is between 0.4 and 0.8.

Abstract: In a method for operating an internal combustion engine including inlet valves with variably adjustable opening curves, during part-load operation, the closing time of the inlet valves and the fuel injection time are controlled as a function of the cylinder internal temperature so as to maintain the cylinder internal temperature relatively low in a controllable manner for reducing NOx emissions.

Abstract: In an internal combustion engine comprising an exhaust gas turbocharger, including a turbine with at least two inlet passages arranged in the exhaust gas tract of the internal combustion engine, via which exhaust gas from the internal combustion engine can be supplied to a turbine wheel of the turbine, and a valve arrangement being arranged in to the exhaust gas tract to the turbocharger to control the supply of exhaust gas to the inlet passages of the turbine, a valve and turbine inlet passage configuration is selectable providing for a maximum braking power with low thermal load.

Abstract: In a turbocharger for an internal combustion engine of a motor vehicle, comprising a turbine housing having first and second spiral passages, each of which is connected to at least one exhaust gas line of an exhaust train of the internal combustion engine and a turbine wheel disposed within a rotor chamber of the turbine housing and connected to a compressor impeller via a drive shaft for rotation with the impeller, the exhaust gas of the internal combustion engine can be routed through the spiral passages for admission to the turbine wheel via the first and second spiral passages which have different wrap angles around the turbine wheel.

Abstract: In an internal combustion engine comprising an exhaust gas turbocharger, which includes a compressor with a compressor wheel arranged in an inlet tract of the internal combustion engine and a turbine with a turbine wheel coupled rotationally to the compressor wheel and arranged in an at least two-path exhaust gas tract of which is connected to an exhaust gas guide section of the turbine including at least a first spiral channel coupled to the first exhaust path and a second spiral channel coupled to a second exhaust gas path, two guide vane elements are arranged upstream of the turbine wheel and downstream of respective spiral channels which are formed corresponding to a first degree of asymmetry A1 determined as a quotient ? of a first mass flow parameter and a second mass flow parameter which is between 0.4 and 0.8.

Abstract: In a turbine wheel of an exhaust gas turbine comprising a turbine wheel with a hub and a plurality of turbine wheel blades which are arranged on the turbine wheel hub and which extend axially between a turbine wheel inlet and a turbine wheel outlet, the turbine wheel blades are constructed in such a way that the ratio of the hub contour thickness to the external contour thickness of each turbine wheel blade follows a defined function.

Abstract: In an internal combustion engine comprising an exhaust gas turbocharger, including a turbine with at least two inlet passages arranged in the exhaust gas tract of the internal combustion engine, via which exhaust gas from the internal combustion engine can be supplied to a turbine wheel of the turbine, and a valve arrangement being arranged in to the exhaust gas tract to the turbocharger to control the supply of exhaust gas to the inlet passages of the turbine, a valve and turbine inlet passage configuration is selectable providing for a maximum braking power with low thermal load.

Abstract: In a supercharged internal combustion engine having an intake duct and an exhaust gas recirculation system and comprising an exhaust gas turbine with two separate flow passages of different flow cross-sections arranged upstream of a turbine rotor of the exhaust gas turbine, each flow passage being in communication with a respective engine exhaust line for supplying it with exhaust gas and an exhaust gas recirculation line extending from one of the engine exhaust lines to the engine intake duct, a bypass line bypassing the exhaust gas turbine is provided and a common control element is arranged in the recirculation line of the exhaust gas recirculation system and in the bypass line for controlling the exhaust gas flow from the recirculation line selectively to none or any of the intake duct and the turbine bypass line.

Abstract: In an internal combustion engine provided with two exhaust gas turbochargers which each comprise a turbine in an exhaust line and one compressor in an intake section of the engine, two exhaust lines are provided which are each assigned to at least one of the exhaust gas turbines, an exhaust gas recirculation device being arranged between an exhaust line upstream of an exhaust gas turbine and the intake section downstream of a compressor and the two exhaust lines including bypass lines with a control valve for selectively permitting the exhaust gas to bypass the turbine closer to the engine.

Abstract: In an exhaust-gas turbocharger of an internal combustion engine including an exhaust-gas turbine coupled to a compressor by a shaft and having a relatively large and a relatively small turbine inlet flow passage, the relatively large turbine inlet flow passage is arranged adjacent to the shaft and the relatively small turbine inlet flow passage facing away from the shaft and a switching device is provided via which the exhaust gas of the cylinders can be selectively supplied either to the small or to the large or to both of turbine inlet flow passages and furthermore, an exhaust gas recirculation line connected to the exhaust gas line leading to the small turbine inlet flow passage is in communication with the engine intake tract.

Abstract: In an exhaust gas turbocharger for a reciprocating internal combustion engine comprising an exhaust gas turbine in the exhaust line and a compressor in the inlet line of the engine, the exhaust gas turbine has two exhaust gas flow passages, by way of which exhaust gas is fed to the turbine rotor, the ratio of the turbine rotor diameter to the compressor wheel diameter being set by a function, which is dependent on the displacement volume of the internal combustion engine.

Abstract: In an internal combustion engine which is alternatively operated in a powered four-stroke engine driving mode and in a two-stroke engine braking mode with an inlet and an outlet valve stroke curve control device which is provided for adjusting the stroke of both the inlet and of the outlet valves, the valve stroke curve control device holds the outlet valve continuously open in the engine braking mode.

Abstract: In an internal combustion engine having cylinders connected by means of controllable brake valves to a common gas pressure container which is in communication, by way of an outflow line with an outflow valve, with the exhaust strand of the internal combustion engine, an inlet gas pressure container is connected to the intake tract of the internal combustion engine and is in communication with the common pressure container by means of a recirculation line having a controllable check valve arranged therein permitting the establishment of various engine operating and control features.

Abstract: In a method for operating an internal combustion engine including inlet valves with variably adjustable opening curves, during part-load operation, the closing time of the inlet valves and the fuel injection time are controlled as a function of the cylinder internal temperature so as to maintain the cylinder internal temperature relatively low in a controllable manner for reducing NOx emissions.

Abstract: In an internal combustion engine having cylinders connected by means of controllable brake valves to a common gas pressure container which is in communication, by way of an outflow line with an outflow valve, with the exhaust strand of the internal combustion engine, an inlet gas pressure container is connected to the intake tract of the internal combustion engine and is in communication with the common pressure container by means of a recirculation line having a controllable check valve arranged therein permitting the establishment of various engine operating and control features.

Abstract: In a supercharged internal combustion engine having an intake duct and an exhaust gas recirculation system and comprising an exhaust gas turbine with two separate flow passages of different flow cross-sections arranged upstream of a turbine rotor of the exhaust gas turbine, each flow passage being in communication with a respective engine exhaust line for supplying it with exhaust gas and an exhaust gas recirculation line extending from one of the engine exhaust lines to the engine intake duct, a bypass line bypassing the exhaust gas turbine is provided and a common control element is arranged in the recirculation line of the exhaust gas recirculation system and in the bypass line for controlling the exhaust gas flow from the recirculation line selectively to none or any of the intake duct and the turbine bypass line.

Abstract: In a system for venting a crankcase of an internal combustion engine of a motor vehicle provided with an exhaust gas turbocharger, comprising a first vent line which is in communication with the crankcase of the internal combustion engine and opens into an intake duct of the internal combustion engine, and a pump device for withdrawing blow-by gases from the crankcase of the internal combustion engine and increasing the pressure of the blow-by gases in the vent line to the charge air pressure in the intake duct of the internal combustion engine, a second vent line is connected to a bearing housing of the exhaust gas turbocharger and extends to the suction side of the pump device.

Abstract: An internal combustion engine with an exhaust gas recirculation device has two cylinder groups, the exhaust gas from which can be discharged separately via a respective exhaust pipe. The recirculation line of the exhaust gas recirculation device branches off from one of the exhaust pipes and opens out into the induction section of the internal combustion engine. The cylinder groups can be operated with different power outputs, the recirculation line of the exhaust gas recirculation device branching off from the exhaust pipe of the cylinder group with a variable power output.

Abstract: In an internal combustion engine with an intake tract and an exhaust tract, an exhaust gas recirculation device with a recirculation line between the exhaust tract and the intake tract and a controllable recirculation valve arranged in the recirculation line, the intact tract includes, upstream of the connection of the recirculation line to the intake tract, an air separation device, via which the combustion air stream in the intake tract can be separated into an oxygen-rich partial air stream and a oxygen-depleted partial air stream for delivery to the cylinders of the internal combustion engine during part load engine operation in order to increase engine operating efficiency and reduce engine emissions.