Patent ID: 11952931
Assignee: FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Field: Environmental technology (Chemistry)
Classification: CPC F  Y | IPC F

Claim 0:
1. An exhaust emission control device (1), comprising:
at least one exhaust gas line (3) configured to convey exhaust gases;
a heated catalyst assembly (2) configured to receive and react a portion of the exhaust gases with a fuel supplied thereto, the heated catalyst assembly (2) comprising:
a housing (25) having a fuel supply connection (62), an inlet (21) and an outlet (22); and
a catalyst support (5) arranged in said housing (25), the catalyst support (5) having a first side (77) and a second side (79) opposite to the first side (77);
wherein:
said portion of the exhaust gases in said at least one exhaust gas line (3) is fed into the housing (25) through the inlet (21) and is supplied to the first side (77) of the catalyst support (5);
said fuel enters the housing (25) through the fuel supply connection (62) and is supplied to the second side (79) of the catalyst support (5), such that said portion of the exhaust gases and fuel are supplied to the catalyst support (5) in opposite directions; and
reaction products formed by the reaction of said portion of the exhaust gases with said fuel, are discharged from the housing (25) through the outlet (22) and back into the at least one exhaust gas line (3), downstream of the inlet (21); and

a particulate filter (31) and/or an exhaust gas catalytic converter (32) connected to the at least one exhaust line (3) downstream of the heated catalyst assembly (2);
wherein:
a pressure reduction device (7) is positioned in the exhaust gas line (3) between the inlet (21) and the outlet (22) of the heated catalyst assembly (2);
after a cold start, the pressure reduction device (7) is closed to establish a pressure difference between the inlet (21) and the outlet (22) such that a partial flow of the exhaust gas flow flows through the housing of the heated catalyst assembly; and
if a temperature of the exhaust gas is so high that additional heating of the exhaust emission control device is not required, the pressure reduction device (7) is opened to cause a pressure of the exhaust gas at the inlet (21) and the outlet (22) to be about the same.