Patent ID: 7793490

Claim:
An exhaust gas system for diesel vehicles, comprising: a first exhaust line and a second exhaust line connected to an exhaust side of an engine; an SCR catalytic converter connected to said first and second exhaust lines distally from the engine and to receive exhaust gas from the engine; an injection unit for introducing a reducing agent into the exhaust gas upstream from said SCR catalytic converter only into said first exhaust line; and a mixing device connected to said first and second exhaust lines upstream from said SCR catalytic converter, for receiving the exhaust gas from said first and second exhaust lines and for mixing the exhaust gas from said first exhaust line containing the reducing agent with the exhaust gas from said second exhaust line having substantially no reducing agent upstream of said SCR catalytic converter, said mixing device comprising a housing upstream from said SCR catalytic converter, with said first and second exhaust lines disposed to open into said housing to cause the respective exhaust gas streams to enter the housing substantially tangentially; and wherein said housing is formed with a constriction located between a mouth area of said first and second exhaust lines and said SCR catalytic converter, and wherein a cross-sectional area of said constriction is smaller than an end face of said SCR catalytic converter exposed to the exhaust gas.