Patent ID: 9464558
Filing Date: 2016-10-11
CPC Classification: F01N

Claim Text:
1. An exhaust system for an internal combustion engine, the exhaust system comprising: an exhaust line comprising an exhaust pipe with a pipe wall having an inner side defining an exhaust gas path for guiding an exhaust gas flow; a reactant feed device connected to the exhaust pipe, said reactant feed device comprising an injector for introducing reactant into the exhaust gas flow and a mixer arranged in the exhaust pipe downstream of the injector; an electric heating device for heating a length section of the exhaust pipe, the heating device comprising: a heating coil, which winds several times around the exhaust pipe on an outer side of the pipe wall, in the length section, the heating coil comprising an electric conductor formed of a resistance heating material; a heat-insulating cover, which envelops the exhaust pipe at least in the areas of the heating coil; and an electric insulator arranged between the conductor and the outer side of the pipe wall, the heating device being arranged in an area of the mixer and in an area of the reactant feed device, the mixer comprising a cylindrical pipe body and a plurality of guide blades projecting from the cylindrical pipe body, which is in contact with the inner side of the pipe wall, wherein in an area of the mixer, the pipe wall has an axial interruption, which is bridged by the pipe body, wherein at least one of the heating coil is directly in contact with the pipe body in the area of the interruption and the heating coil has a higher winding density in an area of the pipe body than outside the area of the pipe body.