Pressure differentiated exhaust gas aftertreatment device

摘要

The invention relates to an exhaust gas aftertreatment device (10a-f) for purification of exhaust gas emissions. Said exhaust gas aftertreatment device (10a-f) is arranged in an exhaust gas passage subsequently of an internal combustion engine and comprises an encapsulating portion (20a-d), a first catalytic substrate (30) and a second catalytic substrate (40), wherein the second catalytic substrate (40) may be of SCR type. Additionally said exhaust gas aftertreatment device comprises a reductant injecting device (50a-e), a pipe (60) and an obstructing portion (70), wherein said reductant injecting device (50a-e) is arranged such that reductant is injectable within said pipe (60) and the exhaust gas flow through said pipe (60) can be controlled by said obstructing portion (70).