Abstract: An arrangement for the treatment of exhaust gases from a compression-ignition internal combustion engine, in which, fuel is metered via a metering valve and introduced into the exhaust system via an evaporator to promote the action of a reduction catalyst arranged on the downstream side of the engine.

Abstract: To reduce NO.sub.x components in the exhaust gas from a compression-ignition internal combustion engine with the aid of a reducing catalytic converter, a metering device for the supply of reducing agent to be additionally introduced into the exhaust gas, in the form of fuel, is provided to improve the performance of the catalytic converter. For this purpose, use is made of a positive displacement pump designed to meter very small quantities with a helix in the form of a helical groove arranged on a cylindrical body of revolution, the delivery rate being varied by driving the body of revolution at a variable rotational speed.

Abstract: A device is proposed for measuring the composition of fluids, in particular of constituents of exhaust gases from internal combustion engines, in which a light ray (32, 31) is used to irradiate the exhaust gas to be measured over the length of a measuring section (29) and is weakened or changed more or less, depending on the content of constituents. The light signal being received is advantageously registered by a measured length light receiver (18) which is shielded light-tight against the light emitting light source (14) and is evaluated in relation to the original light emission, in an evaluation circuit (26). In this simple way, accurate information is obtained of the exhaust gas clouding and of the loading of a fluid or gas with constituents which are optically active.

Abstract: An apparatus for burning solid particles, in particular soot particles, in the exhaust gas of internal combustion engines having a combustion chamber and an ignition burner connected coaxially through an overflow opening. The combustion chamber includes an annular cup portion forming a hot combustion chamber that is open toward the overflow opening, and downstream of this hot combustion chamber has a plurality of labyrinthine annular conduits toward which a plunger tube extends centrally toward the combustion chamber, through which tube a flow of exhaust gas carrying the soot particles is directed into the hot combustion chamber. The flow of exhaust gas having the soot particles emerges into the hot combustion chamber through radial outlets transversely to the direction of extension of the ignition flame that is propagating through the overflow opening. The soot particles that are supplied are for the most part burned in the hot combustion chamber, and the remainder is burned in the labyrinthine conduits.

Abstract: A device for the removal of solid particles, particularly soot particles, from exhaust gas discharged from an internal combustion engine includes an electrofilter comprised of a plurality of parallel filter tubes each having a separator tube connected to a positive terminal of a high voltage source and a corona discharge electrode connected to a negative terminal of the high voltage source, and a centrifugal separator formed as a multi-cyclone the cyclones of which are arranged in an axial extension of the electrofilter and are connected to the same.

Abstract: An apparatus for burning solid particles, in particular soot particles, in the exhaust gas of internal combustion engines comprising a combustion chamber and an ignition burner connected coaxially through an overflow opening. The ignition burner, to which fuel and combustion air are supplied, has a rotationally symmetrical glow element disposed centrally in a preparation chamber and has a glow plug disposed in a bulge of the preparation chamber. The combustion chamber includes an annular cup-like portion forming a hot combustion chamber that is open toward the overflow opening, and downstream of this hot combustion chamber has a plurality of labyrinthine annular conduits toward which a plunger tube extends centrally toward the combustion chamber, through which tube a flow of exhaust gas carrying the soot particles is directed into the hot combustion chamber.

Abstract: An afterburner for clearing soot from a particle-laden gas stream has a housing centered on an upright axis and having a generally cylindrical upper portion having a downwardly open lower end, and a lower portion tapering toward the axis from the lower end of the upper portion and having at the axis a downwardly closed lower end. An exhaust tube opens at the axis into the upper housing portion above the lower end thereof. A feed tube opening tangentially into the upper housing portion above the lower end thereof introduces the particle-laden gas stream tangentially into the upper housing portion. Thus the soot particles of the gas stream move inertially radially outward and descend in the housing to collect at the lower end of the lower housing portion. An electrical heating element at the axis at the lower end of the lower housing portion burns the soot particles collecting therein.

Abstract: An apparatus for the burning of solid particles, especially soot particles, separated from the exhaust gas from internal combustion engines has a rotationally symmetrical combustion chamber which coaxially adjoins an ignition burner connected with it by a flame transfer orifice. Fuel and air are metered to the ignition burner through an additional-air line and a fuel line and, as a prepared mixture, they are ignited in the ignition burner and enter the combustion chamber through a flame transfer orifice. In the combustion chamber an exhaust gas partial stream enriched with the solid particles is introduced, and, after the solid particles have been consumed together with the additional air put into the combustion chamber, the exhaust gas is then discharged again as cleaned exhaust together with the remaining combustion products through an outlet tube.

Abstract: An apparatus for removing solid particles from internal combustion engine exhaust gases is proposed, in which the flow of exhaust gas travels at a high speed of more than 2.5 m/sec through an elongated tube (4), in which a corona discharge takes place from a coaxial spray disk/electrode arrangement toward the wall of the tube. Inside the tube, the soot particles are agglomerated to form larger particles, which are not deposited on the walls because of the high flow speed, which then carries them to a centrifugal precipitator, leading away from which are a tube carrying scrubbed exhaust gas and an outlet having a small quantity of exhaust gas highly enriched with soot. This soot-enriched flow of exhaust gas can advantageously be recirculated to the intake side of the associated engine for afterburning.

Abstract: A sliding vane compressor for use in refrigeration systems includes a rotatable hollow shaft, a cylindrical compressor rotor which surrounds the shaft, end covers enclosing the compressor rotor and a pair of vanes disposed within the rotor to compress a working medium entering the rotor. The compressor rotor and end covers have end faces in a contact area therebetween. At at least one of end faces of either rotor or end cover, a number of spirally-shaped grooves are formed curved in the direction of rotation of the rotor shaft. These grooves extend from the periphery of the respective end face toward the center thereof but short of said center to produce a flow preventing leakage of the working medium between the low pressure region and the high pressure region in the compressor.

Abstract: A multicylinder, stratified charge, internal combustion engine in which the main combustion chamber of each cylinder is coupled, through a conduit with controllable flow cross section, to the precombustion chamber of the cylinder which precedes it in the firing order of the engine. A flutter valve controls the flow of gases into each precombustion chamber. Part of the fuel injected just ahead of the main engine inlet valve in the induction tube of each cylinder is thereby drawn off and delivered to the precombustion chamber of the preceding cylinder in the firing order of the engine.

Abstract: A compressor, particularly a cooling-medium compressor of a vehicle climate-control arrangement, has an exhaust outlet. An oil separator is connected to the exhaust outlet and comprises a cylindrical coagulator formed of a plurality of layers of wire fabric, and end plates closing off the opposite ends of the cylindrical coagulator, with one of the end plates being provided with an inlet opening for the inflow of a gas-oil mixture from the compressor exhaust outlet into the oil separator.