Patent ID: 8006487

Claim:
An exhaust system for an internal combustion engine in a motor vehicle, comprising an exhaust line in which an exhaust treatment device is provided for treatment of the exhaust gases coming from the internal combustion engine, wherein upstream from the exhaust treatment device, a heating device is provided for heating the exhaust gases in the exhaust line, the heating device being connected to a fuel supply and to an air supply which produces primary air and secondary air, the heating device having a pre-oxidation zone and a post-oxidation zone situated downstream from the pre-oxidation zone, the pre-oxidation zone connected to the fuel supply to supply it with liquid fuel and connected to the air supply for its supply of primary air, the post-oxidation zone being connected to the air supply for its supply of secondary air, and wherein the heating device further comprises a porous flow-through structure arranged between the pre-oxidation zone and the post-oxidation zone for retarding droplet breakthrough of fuel into the post-oxidation zone and homogenizing a mixture of fuel, primary air and oxidation products.