Abstract:
In a compressor particularly of an exhaust gas turbocharger of an internal combustion engine having a compressor wheel rotatably supported in a compressor housing which includes a diffuser structure with an adjustable diffuser geometry comprising guide vanes pivotally supported, an adjustment ring is provided with engagement elements which engage forked end structures of the guide vanes at the outer ends of the guide vanes opposite the pivotal guide vane support so that the pivot position of the guide vanes can be adjusted by rotation of the adjustment ring.
Abstract:
The invention concerns an exhaust gas turbocharger for an internal combustion engine, with at least one turbine arranged in the exhaust gas stream downstream of the internal combustion engine, wherein the turbine includes at least one flow channel with at least one radial flow cross-section, with a nozzle ring bordering the radial flow cross-section, wherein for the variable adjustment of the radial flow cross-section a variable guide vane is provided in this area.
Abstract:
In an exhaust-gas turbocharger having a compressor and an exhaust-gas turbine, which drives the compressor and comprises a multipart exhaust gas supply duct manifold and a turbine rotor, to which pressurized exhaust gas can be delivered by way of the exhaust gas supply duct, the exhaust gas supply duct manifold includes at least three flow passages, which, except for one, are provided with shut-off flaps, which are adjustable independently of one another.
Abstract:
The invention relates to a radial compressor for producing a compressed gas flow, having a casing, an impeller which is arranged therein has a hub which carries blades. A ring is arranged in the flow duct concentrically with the hub, and is accommodated in a recess in the inner surface of the casing. The ring has wall slits on its inner surface. An annular gap is provided between that end face of the ring which is directed downstream and an end face of the recess which corresponds thereto and is directed upstream.
Abstract:
An operating internal combustion engine with at least one cylinder (2), and a piston (12), which can move in an alternating manner therein, is used to compress a fuel mix in a combustion chamber (11). In order to determine the nitrogen oxide content in oxygen-containing exhaust gases, the quantity of fuel fed to the cylinder (2) and the air mass flowing in an induction pipe (15) are recorded and are fed to an electronic circuit (6). The center of gravity (S) of the combustion is determined from at least one current measured value for the engine operation, and the level of nitrogen oxide emissions is calculated from the value for the center of gravity (S) of the combustion, including the values for the recorded fuel quantity and air mass.
Abstract:
In a compressor particularly of an exhaust gas turbocharger of an internal combustion engine having a compressor wheel rotatably supported in a compressor housing which includes a diffuser structure with an adjustable diffuser geometry comprising guide vanes pivotally supported, an adjustment ring is provided with engagement elements which engage forked end structures of the guide vanes at the outer ends of the guide vanes opposite the pivotal guide vane support so that the pivot position of the guide vanes can be adjusted by rotation of the adjustment ring.
Abstract:
An exhaust gas turbocharger with a variable turbine geometry can be adjusted in the fired engine operation by an automatic turbine controller to a definable desired supercharging pressure in the intake port. In the braking operation, the turbocharger can be adjusted by an engine braking system with an automatic braking controller as a function of operating parameters of the internal-combustion engine into a ram position which increases the pressure in the exhaust gas system. A change-over element is provided for the change-over between the engine braking system and the automatic turbine controller. To make the exhaust gas turbocharger variable, the automatic turbine controller and the engine braking system each have a modular design and a separate construction. A manual braking signal to the engine braking system, can be generated in a manually adjustable brake operating device. A change-over element is provided for changing over between the automatic braking controller and the brake operating device.
Abstract:
A process for selective catalytic reduction of nitrogen oxides from exhaust gases, preferably those from diesel engines in vehicles, using pulsed superstoichiometric addition of NH.sub.3 or NH.sub.3 -releasing substances, comprises controlling the pulsed superstoichiometric addition of NH.sub.3 in such a way that, after it has started, the addition is interrupted again only when the amount of NH.sub.3 stored in the catalyst has reached a specific upper threshold value which is predetermined in accordance with the catalyst properties and the catalyst volume, the amount of NH.sub.3 stored being calculated from the difference between the metered amount of NH.sub.3 and the amount of NO.sub.x separated off, which is determined from the NO.sub.x concentration in the exhaust gas and the average degree of separation, and the addition of NH.sub.3 is resumed only when the amount of NH.sub.3 stored in the catalyst, which is determined in the same way, has reached a predetermined lower threshold value, this pulsed addition of NH.sub.3 being interrupted after a predetermined number of cycles until the amount of NH.sub.3 stored in the catalyst, which is determined in the manner described, has completely reacted, this completing one entire cycle of the pulsed addition of NH.sub.3.
Abstract:
A process is described for manufacturing a carbon particle filter having a plurality of channels which extend in the exhaust gas flow direction and which are alternatingly sealed at the upstream and downstream end of a porous ceramic material. To minimize the time required for producing the channels, a slip-like ceramic starting material is applied to a fabric having longitudinal threads corresponding to the size location and position of the channels and extending at least in the longitudinal direction of the filter. The carbon filter body is then formed by layering the coated fabric and thereafter in the course of the ceramic firing of the carbon filter body, its inlet and outlet channels are formed by burning away the longitudinal threads.
Abstract:
The invention relates to a soot-particle filter for after-treatment of the exhaust gases of diesel engines by oxidation and the supply of thermal energy. Exhaust-gas-permeable supporting tubes extend in a filter housing and have an applied catalytic filter winding, via which exhaust gases flow radially from outside to inside into the supporting tubes. An exhaust-gas-permeable insert with a catalytically effective surface is arranged in each supporting tube to thereby enhance the effectiveness of the filter without increasing its overall size.