Abstract: A method for operating a diesel internal combustion engine having a compressed air source, a diesel particulate filter situated in the exhaust gas system, and a secondary air line and secondary air compressor for introducing secondary air into the exhaust gas system of the internal combustion engine, in which the compressed air source is used to drive the secondary air compressor.

Abstract: A method for operating a diesel internal combustion engine having a compressed air source, a diesel particulate filter situated in the exhaust gas system, and a secondary air line and secondary air compressor for introducing secondary air into the exhaust gas system of the internal combustion engine, in which the compressed air source is used to drive the secondary air compressor.

Abstract: A liquid filter, particularly for filtering diesel fuel, having a device for automatically discharging water separated from the fuel in the liquid filter, including a housing with an inlet and an outlet for the liquid to be filtered, a filter element arranged in a sealed manner between the inlet and the outlet, and a water collecting area underneath the filter element, in which the automatic water discharge device is connected in a sealed manner to the housing below the water collecting area, and includes in a single housing a sensor for sensing the water level in the water collecting area, an electrically operated water discharge device for discharging water from the water collecting area, a water outlet, and a microprocessor operatively connected to the sensor, to the water discharge device and to a control unit of the internal combustion engine, such that in a predetermined operational state of the internal combustion engine while the engine is running, the microprocessor activates the water discharge devi

Abstract: The invention relates to a centrifugal separator for separating oil and/or solid particles entrained in an air stream, particularly for de-oiling crankcase gases of an internal combustion engine. The centrifugal separator has a mixture inlet for the oil and/or solid particle containing air, an air outlet for the cleaned air and an oil outlet for oil and/or solid particles. It has a stator configured as a housing in which a rotor is disposed, which is operably connected to a drive. A basket is non-rotatably connected to the rotor. The basket has a substantially cylindrical part, which extends in the direction of the mixture inlet and substantially parallel to the stator.

Abstract: A free-jet centrifuge which, in contrast to prior art centrifuges which are braked by bearing friction, includes a device for braking the rotor when the oil pressure falls below a predetermined value. The rotor is mounted in a slide bearing (12), which simultaneously forms the centrifuge oil inlet (23), and also is provided with a roller bearing (19), which minimize bearing friction and enables the rotor to attain the highest possible rotational speeds. Friction partners (15a, 15b) are disposed on the centrifuge housing (10) and rotor (11) and are pressed against one another by a spring (20) when the oil pressure drops below operating pressure, to stop the rotor in order to minimize run-on of the centrifuge and the noise and bearing wear associated with run-on.

Abstract: A method of monitoring the operation of a free jet centrifuge installed in a fluid system, and a free jet centrifuge suitable for installation in such a system. The centrifuge (10) is provided with sensors, such as a piezoelectric sensor (22) and/or a rotational speed sensor (24), which enable determination of the operating parameters of the centrifuge rotor, such as accumulation of separated sediments, bearing wear, or other malfunctions independent of any axial force generated by the centrifuge nozzles (18). Signals are obtained, which can be evaluated by an electronic analysis system (23), and which can output an error signal (f).

Abstract: A free-jet centrifuge which, in contrast to prior art centrifuges which are braked by bearing friction, includes a device for braking the rotor when the oil pressure falls below a predetermined value. The rotor is mounted in a slide bearing (12), which simultaneously forms the centrifuge oil inlet (23), and also is provided with a roller bearing (19), which minimize bearing friction and enables the rotor to attain the highest possible rotational speeds. Friction partners (15a, 15b) are disposed on the centrifuge housing (10) and rotor (11) and are pressed against one another by a spring (20) when the oil pressure drops below operating pressure, to stop the rotor in order to minimize run-on of the centrifuge and the noise and bearing wear associated with run-on.

Abstract: A process is described for producing filter elements which contain a cross-wound yarn as the filter material, wherein twisted yarn of fine individual fibers is roughened to enhance its filtering action. The yarn may be heat-resistant and the filter element may be used as a soot filter in the exhaust gas stream of an internal combustion engine. Before the yarn is wound up, fiber tufts are broken up by pulling the yarn under tension over a moving roughening surface, the direction of movement of the roughening surface differing by an angle alpha from the direction of movement of the yarn in the area of contact between the yarn and the roughening surface, and the angle alpha being selected in relation to the twist of the yarn, particularly so that the threads of the yarn in contact with the roughening surface are oriented transversely to the direction of movement of the roughening surface. The process produces a roughened yarn which provides the required high filter performance for a soot filter.

Abstract: The twistless and/or weakly twisted wire rope or cable with the many strand many layer structure comprises a core rope and a cover layer stranded on the core rope in an opposite stranding direction. The core rope is made exclusively from substantially circular strands and the cover layer is made exclusively from only one layer of substantially flat strands.