Abstract: A medium supply system of an exhaust gas cleaning device for treating the exhaust gas of an internal combustion engine comprising a storage tank and a supply line which is connected to the storage tank for supplying the medium to a dosing unit connected to an exhaust pipe and to a recycling line for recycling the medium to the storage tank. The supply line and/or the recycling line are provided with at least one conduit area comprising at least one first and second parallel partial channels for the medium circulation, wherein said partial channels exhibit different insulation properties. An exhaust gas cleaning device comprising the inventive supply system and a method for the operation thereof are also disclosed.

Abstract: The invention relates to a medium supply system, in particular of an exhaust gas cleaning device for treating the exhaust gas of an internal combustion engine comprising a storage tank (10) and a supply line (11) which is connected to the storage tank (10) for supplying the medium to a dosing unit (14) connected to an exhaust pipe (12) and to a recycling line (13) for recycling the medium to the storage tank (10). Said invention is characterised in that the supply line (11) and/or the recycling line (13) are provided with at least one conduit area (33) comprising at least one first (15) and second (16) parallel partial channels for the medium circulation, wherein said partial channels (15, 16) exhibit different insulation properties. An exhaust gas cleaning device comprising the inventive supply system and a method for the operation thereof are also disclosed.

Abstract: A procedure to introduce a reagent substance into the exhaust duct of an internal combustion engine and a device to implement the procedure are proposed. At least one catalytic converter is disposed in the exhaust duct of the internal combustion engine. In front of the aforementioned catalytic converter(s), a reagent substance subjected to pressure is sprayed into the exhaust gas. The reagent substance pressure set point is established as a function of a parameter. The procedural approach allows for a targeted employment of the reagent substance and a high degree of utilization of the converter.